Organization
Institute of Integrated Research Laboratory for Future Interdisciplinary Research of Science and Technology Specially Appointed Professor
Title
Specially Appointed Professor
External link
KYOGOKU KEIJI
Degree
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Doctor of Engineering ( The University of Tokyo )
Research Interests
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Lubrication
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Tribology
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接触
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摩擦
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潤滑
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トライボロジー
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Contact Mechanics
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Friction
Research Areas
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology
Education
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The University of Tokyo Graduate School, Division of Engineering
- 1982
Country： Japan
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The University of Tokyo Faculty of Engineering
- 1976
Country： Japan
Research History
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Tokyo Institute of Technology Graduate School of Science and Engineering Professor
2002
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Tokyo Institute of Technology Graduate School of Science and Engineering Associate Professor
2000
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Tokyo Institute of Technology Faculty of Engineering Associate Professor
1993
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Tokyo Institute of Technology Faculty of Engineering Research Associate
1982
Professional Memberships
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日本スポーツ産業学会
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日本油空圧学会
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日本トライボロジー学会
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日本機械学会
Papers
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Kyogoku Laboratory, Tokyo Institute of Technology
Keiji Kyogoku, Satoshi Momozono
Toraibarojisuto/Journal of Japanese Society of Tribologists 60 ( 6 ) 379 - 380 2015
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Effects of interfacial free energy on adhesive friction behavior of elastomer surfaces under wet conditions
Satoshi Momozono, Yoji Iguchi, Kazuya Oshikiri, Kenya Nakamura, Keiji Kyogoku
5th World Tribology Congress, WTC 2013 4 3208 - 3211 2013
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Dissipation characteristics of adhesive kinetic friction on amorphous polymer surfaces Reviewed
Satoshi Momozono, Hiroyuki Takeuchi, Yoji Iguchi, Kenya Nakamura, Keiji Kyogoku
TRIBOLOGY INTERNATIONAL 48 122 - 127 2012.4
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A Boundary Friction Model with Attachments of Molecular Chains and Interfacial Failure for Amorphous Polymers Reviewed
Satoshi Momozono, Kenya Nakamura, Keiji Kyogoku
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 55 ( 11 ) 827 - 835 2010
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Measurement of lubricant film thickness on rolling contact track
Naohide Miyamoto, Hiroyuki Takeuchi, Satoshi Momozono, Keiji Kyogoku, Tsunamitsu Nakahara, Shingo Obara
World Tribology Congress 2009 - Proceedings 769 2009
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Influence of parameters on the transient traction of wheel/rail contact under low-speed and wet conditions
Koan-Sok Baek, Keiji Kyogoku, Tsunamitsu Nakahara
Japanese Journal of Tribology 52 ( 3 ) 245 - 256 2007
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Influence of parameters on the transient traction of wheel/rail contact under low-speed and wet conditions Reviewed
Koan-Sok Baek, Keiji Kyogoku, Tsunamitsu Nakahara
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 52 ( 5 ) 359 - 366 2007
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Measurements of temperature distributions around longitudinally grooved rough surfaces in sliding elastohydrodynamic point contacts Reviewed
Kazuyuki Yagi, Keiji Kyogoku, Tsunamitsu Nakahara
TRIBOLOGY TRANSACTIONS 49 ( 4 ) 482 - 489 2006.10
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The effect of interaction between neighboring asperity contacts on wear mode transition in sliding contact of rough surfaces
Tomohisa Tanaka, Chikara Yamanaka, Keiji Kyogoku, Tsunamitsu Nakahara
Proceedings of the World Tribology Congress III - 2005 109 - 110 2005
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Mechanism of dimple formation under elastohydrodynamic conditions Reviewed
K Yagi, K Kyogoku, T Nakahara
TRIBOLOGICAL RESEARCH AND DESIGN FOR ENGINEERING SYSTEMS 111 - 120 2003
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Frictional characteristics of a fiber as a part of paper-based clutch facing
MOMOZONO Satoshi, KURAKAKE Motohito, KYOGOKU Keiji, NAKAHARA Tsunamitsu
The proceedings of the JSME annual meeting 2003 125 - 126 2003
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Temperature measurements of both sliding surfaces and estimation of temperature profile across film thickness under EHL conditions Reviewed
K Yagi, K Kyogoku, T Nakahara
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 47 ( 4 ) 321 - 328 2002
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Experimental verification of oil whirl of piston in axial piston pump and motor Reviewed
K Tanaka, T Nakahara, K Kyogoku
JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING 44 ( 1 ) 230 - 236 2001.3
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Temperature measurements of oil film and surface in point contact EHL under high slip ratio conditions
Kazuyuki Yagi, Keiji Kyogoku, Tsunamitsu Nakahara
Japanese Journal of Tribology 46 ( 5 ) 290 - 291 2001
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Identification of boundary friction coefficient under mixed lubrication in block-on-ring friction tester with aid of partial EHL analysis
Shinji Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku, Satoshi Momozono
ASTM Special Technical Publication ( 1404 ) 210 - 220 2001
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The effect of slip on critical contact pressure causing wear mode transition based on Burwell-Strang's concept - Analysis by slip line field theory Reviewed
T Tanaka, T Nakahara, K Kyogoku
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 46 ( 4 ) 339 - 345 2001
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Temperature measurements of oil film and surface in point contact EHL under high slip ratio condition Reviewed
K Yagi, K Kyogoku, T Nakahara
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 46 ( 9 ) 725 - 732 2001
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Identification of boundary friction coefficient under mixed lubrication in block-on-ring friction tester with aid of partial EHL analysis Reviewed
S Tanaka, T Nakahara, K Kyogoku, S Momozono
BENCH TESTING OF INDUSTRIAL FLUID LUBRICATION AND WEAR PROPERTIES USED IN MACHINERY APPLICATIONS 1404 210 - 220 2001
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The effect of slip on critical contact pressure causing wear mode transition based on burwell-strang's concept: Analysis by slip line field theory
Tomohisa Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku
Japanese Journal of Tribology 46 ( 2 ) 122 - 124 2001
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Stochastic analysis on critical pressure in concept of mode transition from mild to severe wear by Burwell-Strang Reviewed
T Tanaka, T Nakahara, K Kyogoku
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 45 ( 11 ) 832 - 838 2000
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Stochastic analysis of critical pressure in the concept of mode transition from mild to severe by burwell-strang
Tomohisa Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku
Japanese Journal of Tribology 45 ( 6 ) 490 - 491 2000
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Lubrication characteristics of refrigerating/air conditioning rotary compressor (Part 2): Experimental verification of mixed lubrication analysis of vane tip
S. Tanaka, K. Kyogoku, T. Nakahara
Japanese Journal of Tribology 45 ( 4 ) 323 - 333 2000
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Approximate Analysis of Friction between Cam and Follower
KUME Hiromichi, KYOGOKU Keiji, NAKAHARA Tsunamitsu
The proceedings of the JSME annual meeting 2000 351 - 352 2000
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Lubrication characteristics on sliding surfaces between piston and cylinder in a piston pump and motor - (Effects of running-in, profile of piston top and stiffness) Reviewed
K Tanaka, K Kyogoku, T Nakahara
JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING 42 ( 4 ) 1031 - 1040 1999.12
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Experimental Verification of Oil Whirl of Piston in Axial Piston Pump and Motor Reviewed
Kazuhiko Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 65 ( 637 ) 3811 - 3817 1999
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Lubrication characteristics on sliding surfaces between piston and cylinder in a piston pump and motor: (Effects of running-in, profile of piston top and stiffness) Reviewed
Kazuhiko Tanaka, Keiji Kyogoku, Tsunamitsu Nakahara
JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing 42 ( 4 ) 1031 - 1040 1999
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Nakahara and Kyogoku Laboratory, Tokyo Institute of Technology Reviewed
T Nakahara, K Kyogoku, S Momozono, S Tanaka
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 44 ( 8 ) 594 - 594 1999
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Lubrication characteristics on sliding surfaces in a piston pump and motor during running-in tests
Kazuhiko Tanaka, Keiji Kyogoku, Tsunamitsu Nakahara
ASTM Special Technical Publication ( 1339 ) 46 - 58 1999
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Effect of surface roughness on friction loss between cam and follower Reviewed
T Nakahara, M Yamaji, K Kyogoku
TRIBOLOGY FOR ENERGY CONSERVATION 34 301 - 308 1998
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Mixed lubrication analysis with adsorbed boundary lubricant film .1. Basic formulation and rigid-isoviscous analysis Reviewed
S Momozono, K Kyogoku, T Nakahara
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 41 ( 4 ) 348 - 355 1996
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Lubrication characteristics of refrigerating/air conditioning rotary compressor: Mixed lubrication analysis on vane tip
Shinji Tanaka, Keiji Kyogoku, Tsunamitsu Nakahara
Japanese Journal of Tribology 41 ( 3 ) 252 - 267 1996
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Mixed lubrication analysis with adsorbed boundary lubricant film: (Part 1): Basic formulation and rigid-isoviscous analysis
Satoshi Momozono, Keiji Kyogoku, Tsunamitsu Nakahara
Japanese Journal of Tribology 41 ( 4 ) 408 - 421 1996
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Piston rotation and frictional forces between piston and cylinder of piston and motor
Tanaka Kazuhiko, Nakahara Tsunamitsu, Kyogoku Keiji
Proceedings of the JFPS International Symposium on Fluid Power 1993 ( 2 ) 235 - 240 1993
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LUBRICATION OF OIL-HYDRAULIC PISTON PUMP MOTOR .2. MEASUREMENT OF OIL FILM THICKNESS BETWEEN PISTON AND CYLINDER Reviewed
K KYOGOKU, T NAGANUMA, Y HAMAMURA, T NAKAHARA
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 36 ( 1 ) 28 - 35 1991
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PHASE INVERSION REGION IN O W TYPE EMULSION LUBRICATION Reviewed
T NAKAHARA, S SHIOKAWA, K KYOGOKU
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 35 ( 12 ) 907 - 913 1990
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Lubrication modes between vane tip and camring in oil hydraulic vane pumps.
NAKAHARA Tsunamitsu, JUNG Jae-Youn, KYOUGOKU Keiji
Transactions of the Japan Society of Mechanical Engineers Series C 56 ( 521 ) 79 - 87 1990
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LUBRICATION OF OIL-HYDRAULIC PISTON PUMP MOTOR .1. Reviewed
K KYOGOKU, Y HAMAMURA, T NAGANUMA, T NAKAHARA
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 35 ( 12 ) 914 - 921 1990
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OBSERVATIONS OF LIQUID DROPLET BEHAVIOR AND OIL FILM FORMATION IN O/W TYPE EMULSION LUBRICATION Reviewed
T NAKAHARA, T MAKINO, K KYOGOKU
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 110 ( 2 ) 348 - 353 1988.4
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Measurement of dynamic pressure aronud the vane in an oil hydraulic vane pump.
JUNG Jae Youn, KYOGOKU Keiji, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers Series C 54 ( 504 ) 2047 - 2054 1988
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ESTIMATION OF RUNNING-IN PROCESS BY MEANS OF FRICTION PATTERNS Reviewed
H SATO, K KYOGOKU, SY CHAO, T NAKAHARA
JOURNAL OF JAPAN SOCIETY OF LUBRICATION ENGINEERS 31 ( 2 ) 102 - 109 1986
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Mechanism of bubble formation and growth in oil film of bearing.
KYOGOKU Keiji, SOMEYA Tsuneo
Transactions of the Japan Society of Mechanical Engineers Series C 51 ( 461 ) 66 - 73 1985
Books
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潤滑のからくり：流体潤滑
日本機械学会講習会教材 新・役に立つトライボロジー 2001
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潤滑のからくり：流体潤滑
日本機械学会講習会教材 新・役に立つトライボロジー－基礎から応用まで－ 2000
MISC
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Fundamental Phenomena : Introduction to Hydrodynamic Lubrication
KYOGOKU Keiji
57 ( 3 ) 150 - 151 2012.3
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Measurement of Contact Conditions between Suction-Side Bush and Blade in Swing Compressor
TANAKA Shinji, ITO Yasutaka, NAKAHARA Tsunamitsu, KYOGOKU Keiji
Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 28 ( 1 ) 43 - 50 2011.3
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Theoretical model for adhesive friction between elastomers and rough solid surfaces (vol 132, 114105, 2010)
Satoshi Momozono, Kenya Nakamura, Keiji Kyogoku
JOURNAL OF CHEMICAL PHYSICS 133 ( 7 ) 2010.8
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Theoretical model for adhesive friction between elastomers and rough solid surfaces
Satoshi Momozono, Kenya Nakamura, Keiji Kyogoku
JOURNAL OF CHEMICAL PHYSICS 132 ( 11 ) 114105 2010.3
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Theoretical model for adhesive friction between elastomers and rough solid surfaces
Satoshi Momozono, Keiji Kyogoku, Kenya Nakamura
The Journal of Chemical Physics 132 ( 11 ) 114105 2010
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An experimental study of transient traction characteristics between rail and wheel under low slip and low speed conditions
Koan-Sok Baek, Keiji Kyogoku, Tsunamitsu Nakahara
WEAR 265 ( 9-10 ) 1417 - 1424 2008.10
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An experimental investigation of transient traction characteristics in rolling-sliding wheel/rail contacts under dry-wet conditions
Koan-Sok Baek, Keiji Kyogoku, Tsunamitsu Nakahara
WEAR 263 ( 1-6 ) 169 - 179 2007.9
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An experimental investigation of transient traction characteristics in rolling-sliding wheele/rail contacts under dry-wet conditions
Koan-Sok BAEK, Keiji KYOGOKU, Tsunamitsu NAKAHARA
Wear 263 ( 1-6 ) 169 - 179 2007
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BAEK Koan-Sok, KYOGOKU Keiji, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers C 73 ( 726 ) 611 - 618 2007
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Motion Characteristics of Slipper Bearing in Swash Plate Type Piston Pump and Motor
TANAKA Kazuhiko, NAKAHARA Tsunamitsu, KYOGOKU Keiji, FUJITA Katsushi
Transactions of the Japan Society of Mechanical Engineers C 73 ( 728 ) 1236 - 1244 2007
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ウェット状態での低速域における車輪／レール間の過渡的トラクションに及ぼす諸因子の影響
白官錫, 京極啓史, 中原綱光
トライボロジスト 52 ( 5 ) 359 - 366 2007
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2407 Transient Traction Characteristics of Rail/Wheel Contact under Low-Speed and Wet Conditions : Effect of Various Parameters
BAEK Koan-Sok, KYOGOKU Keiji, NAKAHARA Tsunamitsu, CHEN Hua, ISHIDA Makoto
The Transportation and Logistics Conference 2006 ( 15 ) 397 - 400 2006.12
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2408 Relationships between Transient Traction Characteristics and Surface Properties of Rail/Wheel
KUROSAKI Yuki, BASK Koan-Sok, MOMOZONO Satoshi, KYOGOKU Keiji, NAKAHARA Tsunamitsu
The Transportation and Logistics Conference 2006 ( 15 ) 401 - 402 2006.12
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Experimental investigation of effects of slip ratio on elastohydrodynamic lubrication film related to temperature distribution in oil films
K. Yagi, K. Kyogoku, T. Nakahara
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 220 ( J4 ) 353 - 363 2006.6
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Measurements of temperature distributions around longitudinally grooved rough surfaces in sliding elastohydrodynamic point contacts
Yagi Kazuyuki, Kyogoku Keiji, Nakahara Tsunamitsu
TRIBOLOGY TRANSACTIONS 49 ( 4 ) 482 - 489 2006
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BAEK Koan-Sok, KYOGOKU Keiji, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers C 72 ( 721 ) 3001 - 3008 2006
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Measurements of temperature distributions around longitudinally grooved rough surfaces in sliding elastohydrodynamic point contacts
Yagi Kazuyuki, Kyogoku Keiji, Nakahara Tsunamitsu
TRIBOLOGY TRANSACTIONS 49 ( 4 ) 482 - 489 2006
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Relationship between temperature distribution in EHL film and dimple formation
K Yagi, K Kyogoku, T Nakahara
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 127 ( 3 ) 658 - 665 2005.7
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TANAKA Kazuhiko, NAKAHARA Tsunamitsu, KYOGOKU Keiji
Transactions of the Japan Society of Mechanical Engineers. Series C. 70 ( 700 ) 3597 - 3604 2004
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Measurements of two-dimensional distribution of refrigerant concentration in EHL film using micro FT-IR and effect of variation of concentration on oil film thickness
S Tanaka, T Nakahara, K Kyogoku
TRIBOLOGY LETTERS 14 ( 1 ) 9 - 15 2003.1
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The Measurement of two-dimensional distribution of refrigerant concentration in EHL film using FT-IR and effect of variation of concentration on film thickness
S. Tanaka, K, Kyogoku, T. Nakahara
Tribology Letters 14 ( 1 ) 9 - 15 2003
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The Measurement of two-dimensional distribution of refrigerant concentration in EHL film using FT-IR and effect of variation of concentration on film thickness
S. Tanaka, K, Kyogoku, T. Nakahara
Tribology Letters 14 ( 1 ) 9 - 15 2003
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低速域のレール／車輪間の粘着力特性に及ぼす水の影響 －二円筒試験による錆の考察－
高平敬, 中原綱光, 京極啓史, 陳華 石田誠
第10回鉄道技術連合シンポジウム（J-Rail 2003）講演論文集 2003
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Measurements of EHL film temperature between sapphire disk and Longitudinally grooved steel ball under high slip ratioconditions
K. Yagi, K, Kyogoku, T. Nakahara
Synopses of 30th Leeds-Lyon Symposium on Tribology 2003
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Half-frequency whirl of pistons in axial piston pumps and motors under mixed lubrication
K Tanaka, T Nakahara, K Kyogoku
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 217 ( J2 ) 93 - 102 2003
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Measurements of two-dimensional distribution of refrigerant concentration in EHL film using micro FT-IR and effect of variation of concentration on oil film thickness
Shinji Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku
Tribology Letters 14 ( 1 ) 9 - 15 2003
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Measurements of EHL film temperature between sapphire disk and Longitudinally grooved steel ball under high slip ratioconditions
K. Yagi, K, Kyogoku, T. Nakahara
Synopses of 30th Leeds-Lyon Symposium on Tribology 2003
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Half-frequency whirl of pistons in axial piston pumps and motors under mixed lubrication
K. Tanaka, T. Nakahara, K. Kyogoku
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217 ( 2 ) 93 - 102 2003
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On Occurrence of Dimple in EHL Conditions : An Explanation with Measured Results of Temperature Profiles across Oil Film
YAGI Kazuyuki, SATO Tetsuya, KYOGOKU Keiji, NAKAHARA Tsunamitsu
The Machine Design and Tribology Division meeting in JSME 2002 ( 2 ) 187 - 190 2002.4
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機械工学年鑑 14.4 トライボロジー
京極啓史
日本機械学会誌 105 ( 1005 ) 547 2002
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EHL下における両すべり面の温度計測および油膜内温度分布の推定
八木和行, 京極啓史, 中原綱光
トライボロジスト 47 ( 4 ) 321 - 328 2002
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TANAKA Kazuhiko, YOSHISAKI Yasuo, NAKAHARA Tsunamitsu, KYOGOKU Keiji
Transactions of the Japan Society of Mechanical Engineers. Series C. 68 ( 666 ) 601 - 606 2002
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112 In situ observation of EHL contacts using FTIR
UEHARA Takumi, TANAKA Shinji, KYOUGOKU Keiji, NAKAHARA Tsunamitsu
The Machine Design and Tribology Division meeting in JSME 2001 ( 1 ) 35 - 36 2001.3
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Lubrication characteristics on sliding surfaces in a piston pump and motor during running-in tests
K Tanaka, K Kyogoku, T Nakahara
HYDRAULIC FAILURE ANALYSIS: FLUIDS, COMPONENTS, AND SYSTEM EFFECTS 1339 ( 1339 ) 46 - 58 2001
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Burwell-Strangの概念による摩耗モード遷移臨界圧力に及ぼす滑りの影響－二次元すべり線場理論による解析－
田中智久, 京極啓史, 中原綱光
トライボロジスト 46 ( 4 ) 339 - 345 2001
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高滑り率・点接触EHL下での油膜温度と表面温度の計測
八木和行, 京極啓史, 中原綱光
トライボロジスト 46 ( 9 ) 725 - 732 2001
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Experimental verification of oil whirl of piston in axial piston pump and motor
Kazuhiko Tanaka, Tsunamitsu Nakahara, Keiji Kyogoku
JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing 44 ( 1 ) 230 - 236 2001
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Lubrication characteristics of refrigerating/air conditioning rotary compressor (part 2) - Experimental verification of mixed lubrication analysis of vane tip
S Tanaka, K Kyogoku, T Nakahara, K Kawahara
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 45 ( 7 ) 554 - 561 2000
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Burwell-Strangによる軽－重摩耗遷移の概念に基づく遷移臨界圧力の統計的解析
田中智久, 京極啓史, 中原綱光
トライボロジスト 45 ( 11 ) 832 - 838 2000
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冷凍・空調用ロータリ圧縮機の潤滑特性（その２）－ベーン先端部混合潤滑解析の実験的検証－
田中真二, 京極啓史, 中原綱光, 河原克己
トライボロジスト 45 ( 7 ) 554 - 561 2000
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TANAKA Kazuhiko, KYOGOKU Keiji, MOMOZONO Satoshi, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers. Series B. 65 ( 634 ) 2047 - 2055 1999.6
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TANAKA Kazuhiko, KYOGOKU Keiji, MOMOZONO Satoshi, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers. Series B. 65 ( 634 ) 2038 - 2046 1999.6
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冷媒雰囲気下の混合潤滑状態における境界摩擦係数の推定
田中真二, 桃園 聡, 京極啓史, 中原綱光
トライボロジスト 44 ( 5 ) 358 - 365 1999
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Estimation of Coefficient of Boundary Friction under Mixed Lubrication in Refrigerant Atmosphere
Shinji TANAKA, Satoshi MOMOZONO, Keiji KYOGOKU, Tsunamitsu NAKAHARA
Journal of Japanese Society of Tribologists 44 ( 5 ) 358 - 365 1999
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TANAKA Kazuhiko, KYOGOKU Keiji, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers. Series C. 64 ( 626 ) 3959 - 3967 1998.10
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Oil Whirl of Piston in Axial Pistion Pump and Motor (Numerical Calculation under Mixed Lubrication)
TANAKA Kazuhiko, NAKAHARA Tsunamitsu, KYOGOKU Keiji, MOMOZONO Satoshi
Transactions of the Japan Society of Mechanical Engineers. Series C. 64 ( 618 ) 653 - 661 1998.2
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97 ( 10 ) 152 - 155 1997.7
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Dynamics of Japanese Bows and Arrows : Analysis of "Tsunomi" with Link Model and Experiment
KOBAYASHI Koji, KYOGOKU Keiji, NAKAHARA Tsunamitsu
Journal of Japan Society of Sports Industry 7 ( 2 ) 19 - 32 1997
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和弓発射の運動力学(第2報 リンクモデルによる計算と実験の比較)
小林 弘二, 京極 啓史, 中原 綱光
ジョイント・シンポジウム 96 ( 20 ) 98 - 102 1996.10
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冷凍・空調用ロータリ圧縮機の潤滑特性 －ベーン先端部の混合潤滑解析－
田中真二, 京極啓史, 中原綱光
トライボロジスト 41 ( 3 ) 247 - 254 1996
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Turbulent Drag Reduction (Effect of Implanted Fiber)
TAKATA Takashi, KYOGOKU Keiji, NAKAHARA Tsunamistu
Transactions of the Japan Society of Mechanical Engineers. Series B. 62 ( 596 ) 1383 - 1387 1996
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Lubrication Characteristics of Refrigerating/Air Conditioning Rotary Compressor
Shinji TANAKA, Keiji KYOGOKU, Tsunamitsu NAKAHARA
Journal of Japanese Society of Tribologists 41 ( 3 ) 247 - 254 1996
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Motion Measurements of Rotor in Bent-Axis-Type Axial Piston Pump with Spherical Valve Plate
Tanaka Kazuhiko, Kyogoku Keiji, Nakahara Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers. Series B. 60 ( 569 ) p201 - 207 1994.1
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Piston Rotation and Frictional Forces between Piston and Cylinder of Piston Pump and Motor
TANAKA K., Nakahara Tsunamitsu, Kyogoku Keiji
Transactions of the Japan Society of Mechanical Engineers. Series C. 59 ( 560 ) p1192 - 1197 1993.4
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Analysis of Elastohydrodynamic Lubrication under High Speed and High Load
SUGITA Takeshi, NAKAHARA Tsunamitsu, KYOGOKU Keiji, JUNG Jae-Youn
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry 34 ( 2 ) 278 - 285 1991.6
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ジャ-ナルすべり軸受の摩擦特性に及ぼす油中懸濁MoS2粒子の影響--摩擦低減効果の出現条件について
中原 綱光, 牧田 敏之, 京極 啓史
トライボロジスト 36 ( 4 ) p289 - 295 1991.4
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油圧ピストンポンプ・モ-タの潤滑特性-2-ピストン・シリンダ間の油膜厚さ測定
京極 啓史
トライボロジスト 36 ( 1 ) p28 - 35 1991.1
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Analysis of Elastohydrodynamic Lubrication under High Speed and High Load
SUGITA Takeshi, NAKAHARA Tsunamitsu, KYOGOKU Keiji, JUNG Jae-Youn
Transactions of the Japan Society of Mechanical Engineers. Series C. 56 ( 523 ) p768 - 775 1990.3
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Analysis of Lubrication Characteristics in Oil Hydraulic Vane Tip Contacts
NAKAHARA Tsunamitsu, KYOGOKU Keiji, JUNG Jae-Youn
Transactions of the Japan Society of Mechanical Engineers. Series C. 56 ( 523 ) p776 - 782 1990.3
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油圧ピストンポンプ・モータの潤滑特性(第1報)－ピストン・シリンダ間の摩擦力測定
京極啓史
トライボロジスト 35 ( 12 ) 1990
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TODAYS STATE OF LUBRICATION (TRIBOLOGY) EDUCATION IN JAPAN
K KYOGOKU, T SHIBATA, T NAKAHARA
JOURNAL OF JAPAN SOCIETY OF LUBRICATION ENGINEERS 33 ( 12 ) 880 - 886 1988
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The mechanism of bubble growth in a simple shear flow.
Hiroyuki WADA, KYOUGOKU Keiji, NAKAHARA Tsunamitsu
Transactions of the Japan Society of Mechanical Engineers Series C 54 ( 497 ) 19 - 22 1988
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京極啓史
日本機械学会論文集(B編) 50 ( 456 ) 1888 - 1894 1984
Presentations
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カム・フォロワ間摩擦力の近似解析
2000
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FTIRによる混相流体潤滑膜の成分測定
2000
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弾性流体潤滑油膜の赤外放射による温度計測
2000
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Mixed Lubrication Analysis of Vane Tip in Rotary Compressor
2000
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Mixed Lubrication Analysis of Vane Tip in Rotary Compressor
2000 International Compressor Engineering Conference at Purdue 2000
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カム・動弁系の潤滑
1999
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Rheological Charactoristics of Boundary Lubrication Film in a Four-Ball Friction Tester
2001
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The Measurement of Refrigerant Concentration in Lubrication Film under Refrigerant Atmosphere by FT-IR
2001
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Identification of Boundary Friction Coefficient Under Mixed Lubrication in Block-on-Ring Friction Tester with Aid of Partial EHL Analysis
2001
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Identification of Boundary Friction Coefficient Under Mixed Lubrication in Block-on-Ring Friction Tester with Aid of Partial EHL Analysis
Symposium on Bench Testing of the Lubrication and Wear Properties of Industrial Fluids Used in Machinery Applications 2001
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Mixed Lubrication Analysis of Vane Tip in Rotary Compressor
2000
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Mixed Lubrication Analysis of Vane Tip in Rotary Compressor
2000 International Compressor Engineering Conference at Purdue 2000
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The Effect of Shear on Transition of Load Condition in 2D Contact of Rough Surfaces
2001
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Temperature Measurement of Oil Film and Sureface in Point Contact EHL under High Slip Ratio Condition
2001
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An Estimation of Threshold of Mild and Severe Wear basedon BURWELL-STRANG's Concept by Elastic-Plastic Analysis on Rough Surface Contact
2001
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FTIRによる潤滑領域のその場観察
2001
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The Effect of Shear on Transition of Load Condition in 2D Contact of Rough Surfaces
2001
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Temperature Measurement of Oil Film and Sureface in Point Contact EHL under High Slip Ratio Condition
2001
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An Estimation of Threshold of Mild and Severe Wear basedon BURWELL-STRANG's Concept by Elastic-Plastic Analysis on Rough Surface Contact
2001
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円すいころ軸受のころ大端面とつば面間の混合潤滑解析
2001
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点接触EHL下での温度上昇が油膜形成能力に与える影響
2001
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スイング式冷媒圧縮機のブッシュ・ブレード間の潤滑特性（その１-混合潤滑解析）
2001
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スイング式冷媒圧縮機のブッシュ・ブレード間の潤滑特性（その２-油膜厚さの測定）
2001
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Identification of Boundary Friction Coefficient Under Mixed Lubrication in Block-on-Ring Friction Tester with Aid of Partial EHL Analysis
Symposium on Bench Testing of the Lubrication and Wear Properties of Industrial Fluids Used in Machinery Applications 2001
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微小すべり下のマイルドからシビア摩耗への遷移判別 -凝着観察による-
2001
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EHL油膜の温度分布の推定-赤外放射温度計測に基づく-
2001
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小型エンジンのピストンピンの接触解析
2001
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摩耗モード遷移モデルの基礎的検証
2003
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Lubrication Characteristics Between Bush and Blade of Swing Compressor
2002 International Compressor Engineering Conference at Purdue 2002
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弾性流体潤滑下におけるディンプル発生について－すきま方向温度分布計測による考察－
2002
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Lubrication Characteristics Between Bush and Blade of Swing Compressor
2002 International Compressor Engineering Conference at Purdue 2002
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Rheological Charactoristics of Boundary Lubrication Film in a Four-Ball Friction Tester
2001
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The Measurement of Refrigerant Concentration in Lubrication Film under Refrigerant Atmosphere by FT-IR
2001
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Identification of Boundary Friction Coefficient Under Mixed Lubrication in Block-on-Ring Friction Tester with Aid of Partial EHL Analysis
2001
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温度計測に基づく弾性流体潤滑作用の評価
2002
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高すべり率・EHL下における油膜厚さの減少率と油膜温度の関係
2002
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湿式ペーパ摩擦材用繊維の摩擦特性
2002
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点接触グリース潤滑膜内の増ちょう剤濃度分布測定
2002
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真実接触面積に及ぼす接線力の影響
トライボロジー会議 東京2005 2005
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Mesurement of true contact area by means of elliptical polarized light reflection under slip condtion
2005
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Measurement of CO2 refrigerant concentration in EHL film under high CO2 refrigerant pressure by micro FT-IR
2005
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テクスチャリング表面を有する摩擦面の流体潤滑特性
2004
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Mechanism of Dimple Formation under Elastohydrodynamic Conditions
2003
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平行溝を有する表面を用いたＥＨＬ下における油膜温度計測
2003
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Mechanism of Dimple Formation under Elastohydrodynamic Conditions
2003
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Measurement of CO2 refrigerant concentration in EHL film under high CO2 refrigerant pressure by micro FT-IR
the International Tribology Conference Kobe, 2005 2005
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金属ベルトCVTのエレメント・プーリ間の摩擦特性に及ぼす粗さの影響
2004
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レール／車輪間のトラクション特性におけるdryとwetの違い
2004
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全反射光を利用した粗さ面すべり接触部の真実接触面積測定
2004
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レール/車輪間の過渡的トラクション特性と表面性状との関係
TRANSLOG 2006 2006
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Mesurement of true contact area by means of elliptical polarized light reflection under slip condtion
2005
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Measurement of CO2 refrigerant concentration in EHL film under high CO2 refrigerant pressure by micro FT-IR
2005
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Measurement of CO2 refrigerant concentration in EHL film under high CO2 refrigerant pressure by micro FT-IR
the International Tribology Conference Kobe, 2005 2005
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TRANSIENT CHARACTERISTICS OF TRACTION IN WHEEL/RAIL CONTACT UNDER WET CONDITIONS
3rd Asia Int. Conf. on Tribology 2006
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レール/車輪間の過渡的トラクション特性と表面性状との関係
日本機械学会第15回交通・物流部門大会（TLANSLOG2006） 2006
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湿潤で低速におけるレール/車輪間の過渡的トラクション特性
TRANSLOG 2006 2006
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Measurement of lubricant film thickness on rolling contact track
World Tribology Congress 2009 Kyoto 2009
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An experimental investigation of transient traction characteristics in rolling-sliding wheel/rail contacts under dry-wet conditions
16th International Conference of Wear of Materials 2007
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An Experimental Study of Transient Adhesion Characteristics Between Rail and Wheel under low Slip and Low Velocity
7th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2006), Brisbane, Australia, September 2006
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TRANSIENT CHARACTERISTICS OF TRACTION IN WHEEL/RAIL CONTACT UNDER WET CONDITIONS
3rd Asia Int. Conf. on Tribology 2006
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低速域・低すべり率におけるレール/車輪間の過渡的トラクション特性
J-RAIL 2005 2006
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Measurement of lubricant film thickness on rolling contact track
World Tribology Congress 2009 Kyoto 2009
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Effect of wetting on frictional characteristics of elastomers
JAST Tribology Conference Nagoya, September 2008 2008
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エラストマーの凝着摩擦特性に及ぼす濡れの影響
トライボロジー会議 名古屋 2008-9 2008
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An experimental investigation of transient traction characteristics in rolling-sliding wheel/rail contacts under dry-wet conditions
16th International Conference of Wear of Materials 2007
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An Experimental Study of Transient Adhesion Characteristics Between Rail and Wheel under low Slip and Low Velocity
7th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2006), Brisbane, Australia, September 2006
Awards
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日本トライボロジー学会論文賞
2004
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日本トライボロジー学会論文賞
1994
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日本機械学会奨励賞
1988
Research Projects
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Development of the adhesive friction reduction method under low quantity lubrication
Grant number：24560155 2012.4 - 2016.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Momozono Satoshi, KYOGOKU Keiji
Grant amount：\5070000 （ Direct Cost: \3900000 、 Indirect Cost：\1170000 ）
For controlling the friction between elastomer and solid in liquid, theoretical and experimental study about the effect of interfacial free energy has been studied. The proposed theoretical model considers dynamically molecular chain behavior on elastomer surface and interfacial fracture.
This model can explain the stationary friction characteristics, but not enough to explain the variation of dynamic frictional force under dynamically sliding conditions. -
Leak flow analysis and contact mechanics between rough surfaces
Grant number：23560153 2011.4 - 2015.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
KYOGOKU Keiji, MOMOZONO Satoshi
Grant amount：\5070000 （ Direct Cost: \3900000 、 Indirect Cost：\1170000 ）
As contact area increase, real contact and lubrication flow deviate from mixed lubrication theory based on the independent asperity contact hypothesis. In this project, contact mechanics and lubricant flow between contacting rough surfaces under high contact ratio condition have been addressed.
Contact analysis for non-Gaussian distributed rough surfaces have been performed by nonlinear finite element structural analysis, and flow between contacting rough surfaces have been calculated numerically for Reynolds equation problem. Contact area, interspace, and flow rate for 3D fabricated rough surfaces have been measured by total reflection method, contrasting density of dye, and gravimetric technique, respectively. As a result, skewness, which is a parameter for non-Gaussian distribution, have a significant influence on the conflation of contact area and leak flow rate, Low flow rate measured and calculate for negative value of skewness which is observed for truncated rough surfaces. -
Shear strength measurements of vicinity of surface with nano scale boundary film for establishment of friction theory
Grant number：19360072 2007 - 2008
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
NAKAHARA Tsunamitsu, KYOGOKU Keiji, MOMOZONO Satoshi
Grant amount：\13260000 （ Direct Cost: \10200000 、 Indirect Cost：\3060000 ）
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Measurements for load capacitance of fluid film lubrication with diffused electric double layer
Grant number：18560127 2006 - 2007
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
MOMOZONO Satoshi, KYOGOKU Keiji
Grant amount：\3860000 （ Direct Cost: \3500000 、 Indirect Cost：\360000 ）
Hydrodynamic lubrication has the effect of reducing friction except at a low speed. Since molecular attractive force (i.e. van del Waals force) has been predominant effect in micro-nanoscopic system, hydrodynamic load capacitance has not been enough to avoid direct contact between surfaces in low velocity condition. "Stiction" is an example. It is important that development of new lubrication mechanism for MEMS in liquid. Head investigator proposed a new mechanism using electric double layer. It was simulated numerically as result that repulsive force has been taken effect at 10 to 100 nanometers gap between surfaces.
In this study, load capacitance has been measured by SPM (Scanning Probe Microscope), for influences of probe radius, applied voltage, kind and concentrations of ion and distance between surfaces for consideration of ability of nano-lubrication by electrical double layer.
SPM has been modified for measurements of normal and frictional force in liquid. A spherical epoxy resin has been pasted at the top of probe tip with sputter-deposited 10nm Au film. Ionic liquid, which is candidate for future lubrication, has been used. Characteristics of repulsive force measured at 10 to 150 mv voltage have been investigated. -
Development of wear-mode transition model based on analysis of contact mechanics of rough surfaces
Grant number：14550120 2002 - 2003
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
KYOGOKU Keiji, MOMOZONO Satoshi, TANAKA Tomohisa
Grant amount：\3600000 （ Direct Cost: \3600000 ）
The Objective of this project is the experimental verification of Burwell-Strang's hypothesis, that is "abrupt increase of ware rate is caused by transition of yield area from asperity summit level to apparent contact area level".
To achieve the objective, we tried these approaches :
1.We developed a test apparatus for observation of deformation near an asperity using commercial metal microscope. In this test, we measured deformation of mesh previously made on side of softer surface after indentation and dragging between wedge of hard body and flat soft surface.
2.We got good agreement between numerical results of our model used by slip line field theory and those of finite element method. We refined our model using results of FEM. We also calculated distribution of real contact spots under normal and shear stress.
3.We also developed a contact microscope using total reflection method, in order to predict the transition pressure of contact between rough surface and smooth surface. In this apparatus, we can slide contact area in addition to normal load. For preliminary study, we observed growth and increase of real contact spots on blast finished random rough surface under normal load. The results indicated that apparatus could estimate transition pressure and verify our theory.
We are going to study the effect of normal and shear stress on change of real contact spot. We will also try to develop our theory that can predict wear transition pressure under extensive condition. -
宇宙環境下における表面エネルギー勾配を利用した極微量給油法の提案
Grant number：14655064 2002 - 2003
日本学術振興会 科学研究費助成事業 萌芽研究
中原 綱光, 田中 真二, 桃園 聡, 京極 啓史
Grant amount：\2800000 （ Direct Cost: \2800000 ）
本研究では、宇宙環境下の摺動部へ、最小限必要な液体潤滑を給油する方法の一つとして、液体潤滑剤と給油系材料表面との間の表面エネルギーの勾配、例えば濡れ性の局所的な違い、を利用した液体輸送法について提案し、その成立条件、給油量、実用化する場合の問題点を把握し、本給油法の実現可能性を評価することを目的として、本年は大気圧下において表面エネルギー勾配をもった表面を試作し、宇宙環境下で使用されている潤滑剤をその表面に滴下したときに油膜が広がる様子の測定を行うことを目標とした。
第一の目標である「表面エネルギー勾配をもった表面の試作」では、平成14年度の研究結果より「表面コーティング」が最も現実的という結論に達したので、今年度はそのコーティグ膜の試作を行った。コーティング膜としては、DLC(Diamond Like Carbon)が強度も十分にあり、製膜時に原料ガスのメタン以外にフッ化炭素ガスを添加して、その濃度によって膜中のフッ素量を制御できるので、それを選択した。ここでは、さらに表面エネルギーを制御するために、アルゴンと酸素のプラズマに暴露した。その結果、濡れ性の異なる表面を作成することができた。そこで、試験用の表面として、表面エネルギーの異なる薄膜を帯状に配置した表面を準備した。
第二の目標である「給油状態評価」では、液滴界面の広がり状態の把握に光学顕微鏡による「気液界面観察」を,給油状態の確認にレーザー誘起蛍光法および白色光源と分光計を用いた光干渉法による「油膜厚さ計測」を試みた。その結果、液滴が試料表面を広がる様子が観察されたとともに、高分解能で表面に付着した油膜厚さを数μmから10nmの広い範囲にわたって計測することができ、表面エネルギーの異なる薄膜を帯状に配置した表面でも、液体輸送に有効であることが確認できた。 -
The mode transition from mild to severe wear - observation of the realistic contact area under shear stress -
Grant number：12650137 2000 - 2001
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
KYOGOKU Keiji, MOMOZONO Satoshi
Grant amount：\900000 （ Direct Cost: \900000 ）
The threshold of load condition from light to heavy that Burwell and Strang proposed in 1952 as a concept of the mode transition from mild to severe wear, are tried to be estimated considering isotropic and Gaussian surface, and verification by direct observation. In brief, the threshold condition is expressed as the critical pressure at which the nominal contact area is wholly covered with the yielding area. This critical pressure has been calculated using stochastic rough surface contact theory and Johnson's Elastic Plastic Indentation model with Chang-Etsion's analysis. Individual summit of rough asperity has been assumed to be a sphericity and all of them to have the same radius. Analysis has been developed the effect of slip on rough surface contact. The contact is regarded as 2D and is assumed as that between rough surface and plane to apply the slip line field theory.
Micro-sliding mechanism are designed for the system which is able to give the normal load and shearing load to observe the realistic contact points. At the beginning the piezo-scanning stage would be planned for nano-scaled actuator, but it is difficult to decrease the shear deformation at their contact, observe the status of adhesion due to wear of the end of the 400 mm traveling by motor actuated slider.
In the experiments, normal force and tangential force are measured simultaneously. The effects of mechanical characteristics (normal pressure, shear stress, the Young's modulus, hardness and shear strength of surfaces) , geometric characteristics (surface roughness and shape) are investigated in the discussion of the wear mode. The direct observation of the realistic contact area, which mean the shape, number and area of contacted asperity is planed in the near future. -
Mixed lubrication analysis consideration with large deformation
Grant number：09450067 1997 - 1998
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
NAKAHARA Tsunamitsu, TANAKA Katsuhiko, MOMOZONO Satoshi, KYOGOKU Keiji
Grant amount：\6900000 （ Direct Cost: \6900000 ）
Sliding contact at edge with large defomation in many mechanical elements (journal bearings, piston pumps , etc). Analysis method considering gross deformation for this problem is developed in this project. Precise contact FEM analysis without surface roughness, microscopic contact analysis at surface roughness oil film pressure and their comnination are Discussed.
The analysis model under the conditions of piston-cylinder contact in piston pump/motor is used. First, we handle FEM contact with smaller mesh near contact point, to discuss the appropriate mesh size for contact pressure or deformation., then calculate oil film pressure considering deformation.. The fomulation of oil film thickness are for simple shape contact (circle or cylindrical) simple oil film analysis (ie. Ertl-Grubin theory) are for non-simple shape like the edge of piston. It is adapted method for EHL film at the element, which has complex shape or large displacement. Experimental examinations, measurement of displacement by capacity meter and contact area by IR thermalscope are testing now, so there is no applicable results. -
Rheology of boundary lubricant film refrigerant atmosphere
Grant number：09650158 1997 - 1998
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
KYOGOKU Keiji, MOMOZONO Satoshi
Grant amount：\3800000 （ Direct Cost: \3800000 ）
It is in progress to switch to chlorine free refrigerants, since CFCs(Chloro Fluoro Carbons) containing chlorine are considered as causes of ozone depletion and global warming. However, there are several difficulties to alternate refrigerants Particularly, poor solubility of refrigerant in usual mineral oil and poor lubricity of Freon gas are serious. Therefore, it is necessary to improve the lubrication design of sliding parts and to develop the sliding materials and refrigeration oils for alternative refrigerants. A rolling piston type of rotary compressor is widely used as a small refrigerator and air-conditioner for household use because of high volumetric efficiency and compactness. Although the alternation of refrigerants is in progress now, it is indispensable to soluve the lubrication problems of vane tip which has the most severe lubrication condition in refrigerant compressors.
In this project for purpose of developing lubrication design tool for rotary refrigerant compressors, rheological behavior of boundary lubricant film with refrigent molecules.
In addition to that, the coefficients of boundary friction under mixed lubrication in refrigerant atmosphere are estimated by comparing the measured frictional characteristics with the calculated ones and the oil film under elastohydrodynamic lubrication in refrigerant atmosphere are observed by FT-IR microscope in order to obtain unknown parameters of the analysis. Then the validity of this analytical method is shown by comparing metal contact ratios measured for an actual compressor with those of the calculated results. After that, the computer simulations are performed for the lubrication condition in order to suggest guidelines for the lubrication design of the rotary refrigerant compressors. -
Development of Tribotester in refrigerant surroundings to take measures against using Non-Chlorine refrigerant
Grant number：08555040 1996 - 1997
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
NAKAHARA Tsunamitsu, KAWAHARA Katsumi, MOMOZONO Satoshi, KYOGOKU Keiji
Grant amount：\12600000 （ Direct Cost: \12600000 ）
The tribotester developed in this grant consists of a pressure chamber, a tribotesting part and detection of friction and load. The pressure chamber can withstand up to 5 MPa in refrigerant gas pressure and can control the temperature of the oil bath in the tester from 10 to 80゜C and maintain a constant value within (]SY.+-。[)1゜C.The tribotesting part is a standard ring-on-block type Farex friction testor. The sliding speed ranges from 75x10<@D1-3@>D1 up to 7.3m/s, which covers the whole mixed lubrication region for new refregerants and lubricants under practical temperature, are available with a DC servo motor with 0.85 KW power output. The friction force and the contact load can be detected from the outside through bellows seals.
The boundary friction coefficients for various new refrigerant and new lubricants have been obtained in the mixed lubrication region where the tribo-elements in practical compressor state in the most possibility, by means of the mixed lubrication analysis under hard EHL regime.
The calculated results and the measured results by means of the contact electric resistance have been compared and agreed qualitatively. It is found that the combination of the tribotester and the mixed lubrication analysis is quite useful for selecting new lubricants and new materials against new refrigerants. -
混合潤滑状態下における表面粗さ形状の境界摩擦に及ぼす影響
Grant number：08650166 1996
日本学術振興会 科学研究費助成事業 基盤研究(C)
京極 啓史, 桃園 聡
Grant amount：\2500000 （ Direct Cost: \2500000 ）
混合潤滑を解析する上で、流体潤滑寄与分と境界潤滑寄与分の両者は同等の精度で取り扱わなければならないが、従来の解析においては、流体潤滑部分と比較して境界潤滑部分の評価が不十分である.特に表面粗さの形状による接触状態およびそれに伴う摩擦力のモデル化が十分でない.このため,製作した高精度スピンドル装置を用いたボール・オン・ディスク型摩擦試験機を用い,磁気記録装置用ディスクの平滑面に対し,いくつかの粗さ形状のもった軸受鋼球を接触させることによってによって摩擦特性測定し,粗さ形状によって実験結果を整理した.
まず,粗さ形状を,統計分布のみで表し,整理した.なお,吸着膜の特性については,被覆率をLangmuir吸着式から,せん断強さをEyring粘性モデルから導かれるBriscoeのLangmuir膜のモデルを用いる申請者らのモデルを用いた.
実験においては,ボール・オン・ディスク摩擦試験機による実験結果が上記モデルと定性的に一致し,定量的にも近い値が得られた.また,さらに既存の実験装置の改造によりボールオンディスク型の実験装置を製作したが,本年度は実験装置の動作確認と,特性評価に終わった。解析に関しては,実験結果と比較して満足される結果は得られず,ボールオンディスク摩擦試験機による実験とともに今後の課題である. -
混合潤滑状態下における境界摩擦の定量的評価-分子力学を用いた吸着膜の被覆率計算-
Grant number：07650168 1995
日本学術振興会 科学研究費助成事業 一般研究(C)
京極 啓史, 桃園 聡
Grant amount：\2200000 （ Direct Cost: \2200000 ）
混合潤滑を解析する上で、流体潤滑寄与分と境界潤滑寄与分の両者は同等の精度で取り扱わなければならないが、従来の解析においては、流体潤滑部分と比較して境界潤滑部分の評価が不十分であるため,本研究では境界潤滑膜のせん断特性のうち、境界膜の被覆率と膜自身のせん強さに着目し、境界潤滑を含む一般的な混合潤滑モデルの構築、および数値シミュレーションを行ない、混合潤滑下での境界潤滑膜の吸着特性、とくに吸着膜の被覆率とせん強さを定量的に評価し,二円筒式摩擦試験機および今回改造によって製作されたボールオンディスク式摩擦試験機によって測定される摩擦特性と比較,検討した.
まず,油性添加剤の吸着膜について,被覆率をLangmuir吸着式から,せん断強さをEyring粘性モデルから導かれるBriscoeのLangmuir膜のモデルを用いて定量化した。また,その吸着膜モデルを,申請者らの提案している混合潤滑解析モデルに組込み,計算した結果,油膜温度,すべり速度,および荷重の影響を定性的に説明することが出来た。
実験においては,二円筒試験機による実験結果が上記モデルと定性的に一致し,定量的にも近い値が得られた。また,さらに既存の実験装置の改造によりボールオンディスク型の実験装置を製作したが,本年度は実験装置の動作確認と,特性評価に終わった。分子力学を用いた吸着膜の被覆率およびせん断強さの計算は,解析モデルおよび実験結果と比較して満足される結果は得られず,ボールオンディスク摩擦試験機による実験とともに今後の課題である。 -
An quantitative analysis for unsteady partial-EHL and experimental discussion
Grant number：06452166 1994 - 1995
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (B)
NAKAHARA Tsunamitsu, KYOGOKU Keiji
Grant amount：\1000000 （ Direct Cost: \1000000 ）
The purpose of this study is to get a useful analysis model for dynamically loaded mixed lubricated machine elements with concentrated contact. In this report, a new numerical model has been developed and some experiments have been done to obtain the prosperity of the model.
First, a steady state analysis based on thermal elast-hydrodynamic mixed Lubrication theory (TEHML) is introduced. It considers thermal effects of lubricant visco-elasticity and heat at contact area. In this analysis, not only equations of the elast-hydrodynamic mixed lubrication (EHML) but also energy equations of lubricant film are used. Results of pressure, temperature distribution and friction coefficient are presented. Results of this calculation are compared with those of normal EHML,so film thickness by TEHML calculation is more thin than that by normal EHML calculation. At low slip ratio, friction of TEHML calculation is more large than that of normal calculation. It means thermal calculation for dynamically loaded mixed lubricated machine elements with concentrated contact is important.
Second, for example of dynamically analysis, friction and lubrication between cam and follower has been calculated including equations of motion of cam, and squeeze effect for lubricant film. In this calculation, At the point near cam nose where the load significantly changes, the effects of fluid adiabatic change can not be neglected.
Cam and follower friction experiments has been done to valid the calculations. Friction of caluclations accord with that of experiments. But the test equipment (type I) was not enough rigid, it was influenced natural vibration, so type II equipment has been developed. -
低沸点の凝縮液体を溶解した潤滑油による混相流の流体潤滑問題
Grant number：04650127 1992
日本学術振興会 科学研究費助成事業 一般研究(C)
中原 綱光, 京極 啓史
Grant amount：\2100000 （ Direct Cost: \2100000 ）
本研究は、実際の冷媒圧縮器における潤滑油膜の観察を行ってキャビテーション状態を把握する、と同時に、稼働状態での潤滑油粘度と冷媒溶解度を測定することにより、軸受特性を予測できる潤滑流れの理論モデルを構築することを目的として行った。
1.そのために先ず、市販の冷媒圧縮器の下部軸受を透明な石英製軸受に変え、装置外部から観察用円筒を貫通し、さらに底部より照明用円筒を軸受端面まで挿入して照射することにより、軸受内流れが観察できるように改造した実験装置を用いて軸受内油膜を観察し、その画像データを本補助金により購入した画像処理用計算機によって処理した。
2.次に、圧縮器下部に設置した電磁ピストン駆動式オンライン粘度計を用いて稼働状態での冷媒混合潤滑油の粘度を測定した。
3.さらに、圧縮器の一部に透明な窓を設けて潤滑油中に比重ボールを浮べることにより、圧縮器稼働中の潤滑油密度を測定し、予め求めた潤滑油密度と冷媒溶解度の関係から稼働中の冷媒溶解度を求めた。
以上の実験より、(1)実際の圧縮器内においては、冷凍機油と冷媒は完全には撹伴されていない、(2)圧縮器軸受内部では大きなキャビテーション領域が観察され、分散した小気泡は観察されない、(3)これらのキャビテーション現象は空気の溶解した鉱油における潤滑油膜の状態とほぼ同様である、ことなどが明らかになった。
4.これらの実験結果を考察することにより、軸受特性を予測するための、相変化を伴う潤滑流れの理論モデルを構築することができた。
5.その理論モデルに基づいて軸受特性に及ぼす圧縮器内の圧力、回転速度の影響などについて数値計算を試みたが、研究期間内に実験結果と定量的に一致する結果を得るまでにはいたらなかった。 -
境界潤滑モ-ドにおける表面粗さの流体潤滑効果
Grant number：02650111 1990
日本学術振興会 科学研究費助成事業 一般研究(C)
中原 綱光, 京極 啓史
Grant amount：\2000000 （ Direct Cost: \2000000 ）
本研究は,理論上流体潤滑作用が生じない等速逆回転が可能な2円筒摩擦試験機により,荷重ならびにすべり速度を自由に変化できる境界潤滑モ-ドを作り出し,その状態において表面粗さによる流体潤滑作用の影響を実験的に明らかにすることを目的として行なった。 1.試験装置の設計・製作:予算の関係上,現在保有している2円筒ころがり・すべり試験機を,試験円筒の交換が容易でかつ運転中に接触部の観察が容易なように改造し,また摩擦力の測定には測定系の検出感度を下げずに剛性を高めるために,ピエゾ圧電式の荷重変換器に変更した。その結果安定した再現性のよいデ-タが得られるようになった。 2.実験結果表面粗さの高さと方向が異なる数種類の試験片の組合せについて,潤滑油の温度・荷重・すべり速度を変えて,摩擦係数とすべり率の関係を調べた結果,(1)見掛け上流体潤滑作用が生じない等速逆回転すべり状態において,摩擦系数は油温・相対すべり速度および荷重の影響を受けること,(2)すべり率があまり大きくなければ粗さが小さい方が摩擦係数は小さいが,すべり率が大きくなると逆に粗さが大きい方が摩擦係数は小さくなること,(3)粗さの大小を組合せた場合には,粗い方の円筒を高速側にした方が摩擦係数は小さくなり,逆回転時に両者の差が最も大きくなること,(4)充分なじんでいれば,クロスハッチ粗さの場合の方が円周方向粗さの場合より摩擦係数は小さくなるが,充分になじんでいなければ逆になること,などがわかった。3.反省:装置の改造ならびに試験片の準備に予想以上の時間を要したため,当初の計画にあった「付着油膜量の影響」については実行できず,境界潤滑モ-ドにおいて表面粗さによる流体潤滑効果の存在を実証するまでには致らなかった。なお今後の実験については,この実験専用のより高精度の実験装置並びによく管理された表面粗さをもった試験片を用いて行う必要がある。
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潤滑特性におけるエッジ効果
Grant number：01550111 1989
日本学術振興会 科学研究費助成事業 一般研究(C)
中原 綱光, 京極 啓史
Grant amount：\1800000 （ Direct Cost: \1800000 ）
本研究では、従来の弾性流体潤滑理論を拡張して、滑り運動する機械要素のエッジ曲率半径の影響を数値計算によって求め、潤滑特性に及ぼすエッジ曲率半径ならびにエッジ部の摩耗形状の影響を明らかにすることを目的として以下のことを行なった。
1.解析方法 計算モデルを無限幅の直方体の両端に小さな曲率半径をもたせた形状にし、この形状の代表寸法による無次元化と離散値化メッシュの取りかた以外は従来の線接触EHLの数値計算法と同じである。計算の初期値としては、断面が四次曲線の端面をもつ直方体を平面に固体接触させたときの圧力分布を用い、油膜厚さは適当な値を用いた。
2.計算結果 まず、エッジ曲率を一定にし荷重と速度の影響を調べたところ、速度を小さく荷重を大きくすると油膜厚さが薄くなり、エッジ付近での応力集中が起こりやすくなることがわかった。平坦部では凹面状の弾性変形が起こっているが、圧力が低いためにその変形量は小さく、従来のハ-ドEHLとは異なった結果になった。次に、この形状で傾けて滑らせた場合を調べたところ、正のくさび状態はエッジでの応力集中がなくなり、油膜厚さが厚くなっているのに対し、負のくさび状態では入口側のエッジ付近だけに応力がさらに集中し、油膜厚さが極端に薄くなっているのがわかった。この時、荷重を支えている部分では、弾性変形により油膜厚さがほとんど平行になった。最後に、エッジの曲率の影響を調べたところ、油膜厚さにおよぼすエッジ曲率半径の影響が曲率半径の小さいところで顕著であることが明らかになった。
3.今後の展開 本研究で調べた条件のうち、最も厳しい負のくさび状の潤滑状態について詳しく研究する予定。 -
境界潤滑の薄膜レオロジー特性に及ぼす濡れ性の影響
Grant number：63550117 1988
日本学術振興会 科学研究費助成事業 一般研究(C)
中原 綱光, 京極 啓史
Grant amount：\2100000 （ Direct Cost: \2100000 ）
本研究では、濡れ性の異なる種々の材料と潤滑剤の組合せに対して流体潤滑の限界条件を測定し、また固体と液体の界面で濡れ性に比例したすべり率を与えた潤滑理論を作り、その理論と実験結果を比較することにより濡れ性と流体潤滑との相関を明らかにし、境界潤滑のメカニズム解明に寄与することを目的として以下のことを行った。
1.実験装置の改造
補助金の削減により、現在保有する部分ジャーナル試験機を、濡れ性の異なる種々の軸及び軸受が交換できるように改造し、また、なじみ運転の良否が本実験の成否の鍵を握っているので、なじみ運転条件を良好にする手段として負荷に振動を加えることを試みるための改造を施した。
2.流体潤滑限界条件の測定
まず、流体潤滑限界条件に材料の濡れ性以外の影響が少なくなるような実験法を確立するために、まず標準的な金属性のホワイトメタル、アルミニウム合金及び燐青銅につい、再現性ある摩擦特性が得られるなじみ運転法ならびになじみ条件を探した。負荷に振動を加えることを試みた結果、加振しない時よりもよくなじむこと、再現性の良い摩擦特性が得られることが分かった。次に、それらと濡れ性が非常に異なる軸受材料としてセラミックスを用い、鉱油を潤滑剤として実験を行ったが、上記の実験準備と予備実験に大半の時間を取られてしまったので、僅かな結果しか得られず、従って断定はできないが、濡れ性の悪いセラミックスの方が流体潤滑の範囲が狭かった。
3.理論との比較
ここで提案した理論は、従来のレイノルズ方程式において、粘生係数を修正するもので、形の上では希薄気体潤滑論に類似している。しかし、修正係数を実験から求められるものであるので、その係数を求めるまでには至らなかった。
4.反省
この研究専用の単純高精度な装置で実験を行う必要があった。 -
油膜破断部の境界条件に及ぼす濡れ性の影響
Grant number：62550106 1987
日本学術振興会 科学研究費助成事業 一般研究(C)
中原 綱光, 京極 啓史
Grant amount：\2000000 （ Direct Cost: \2000000 ）
本研究は, 漏れ性が最も関係し, しかも流体潤滑の境界条件となる油膜破断部に着目して, その気液界面の挙動に及ぼす漏れ性の影響を調べることを目的とし, 本年度は一環の研究を行なった.
1.円筒・平板型実験装置を用いた実験・・・金属性円筒とガラス平板を用いた実験装置を作製し, ガラス表面に, 透明なFEP(4ふっ化エチレン6ふっ化プロピレン)樹脂, PUdF(ふっ化ビニリデン)樹脂のコーティングを施し, 円筒平板間の隙間, 円筒回転速度を変化させて, 油膜破断気液界面の位置, 形状(すじ状流れの間隔, すじ長さ)を測定した.
2.ジャーナル軸受型実験装置を用いた実験・・・ステンレス製軸とガラス円筒製軸受を用いた実験装置を作製し, 軸表面とガラス円筒内面にそれぞれFEP樹脂のコーティングを施したものと, 施していないものとを使用して, 軸受の偏心立, 軸回転速度を変化させて, 油膜破断位置, 形状及びその安定性を測定した.
以上の研究より本年度に得られた結果をまとめると以下の通りである. 1.軸受(固定面)の漏れ性は油膜破断部に及ぼす影響力が大きく, 軸(移動面)の漏れ性は影響力が小さい.
2.漏れにくい軸受面(固定面)を持つ軸受を用いると, 軸回転速度(すべり速度)の変化に対して, 油膜破断部の挙動にはヒステリシス現象が現れる.
3.漏れにくい軸受面では, 油膜破断部は安定化する傾向にある.
本年度の成果を踏まえて, 今後の展開としては以下の事が考えられる.
1.漏れにくさの度合い(漏れ角など)を用いて, 定量的な扱いを考える.
2.漏れ性の影響がより強く現れると考えられる, 動荷重下の軸受特性に及ぼす油膜破断部の挙動について, 漏れ性の影響を考慮した取扱いを考える. -
Relation between the Limit of Hydrodynamic Lubrication and Micro Cavitation caused by Sruface Roughness
Grant number：60550104 1985 - 1986
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C)
NAKAHARA TSUNAMITSU, KYOUGOKU KEIJI
Grant amount：\1900000 （ Direct Cost: \1900000 ）
The purpose of this reserch is to understand the effect of cavitation caused by surface roughness on the hydrodynamical action near the transition region from hydrodynamic lubrication to boundary lubrication. The observations of the cavities has been made with a pivoted slider having rough surface on a drum and the condition of the cavitation generation and the effect of the cavitation on the lubrication performance were investigated.
The results are shown as follows: (1) The cavities caused by surface roughness were observed in the full film lubricating area for the rough surface but for comparative smooth surface. the cavity was not observed untill two surfaces touched each other. (2) The cavities in the hydrodynamic lubricating area were generated in the backward area of the bearing where the pressure is low. (3) The cavity was generated in the vicinity of the slider center and spreaded to the down stream when the slider touched the rolling drum. (4) The generation of micro cavity did not exert a great effect on the friction coefficient under hydrodynamic lubrication.
Next, to investigate the way of change in the film rupture due to surface roughness and the effect of the film rupture pattern on the bearing performance an apparatus of a transparent slider with rough surface on a roller was employed and the film rupture was observed.
The results are shown as follows: (5) The difference between rough surface and smooth surface was found in the area of the film rupture under the hydrodynmic lubrication. (6) The friction force was infuenced by surface roughness in accordance with the change in film rupture pattern under the hydrodynamic lubrication.