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Ohashi, Akihiro
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A Study of Engine Oils with Low Friction for Motorcycles

Nippon Oil Corporation-Mitsuaki Ishimaru, Tatsuya Okada, Akihiro Ohashi
  • Technical Paper
  • 2005-32-0061
Published 2005-10-12 by Society of Automotive Engineers of Japan in Japan
A four-cycle engine oil formulation with outstanding fuel economy and clutch-slippage prevention has been developed for motorcycles. Fuel economy performance was evaluated by testing low-friction formulations with a motor-driven torque measurement tester and an SRV reciprocating friction tester. An optimized formulation containing both a molybdenum compound and a phosphorus extreme-pressure agent was found to give the best low-friction performance. The further addition of a boron-type dispersant maintained the low-friction performance while preventing clutch slippage. When test-produced oils were used for 1800 km in a commuter motorcycle, the fuel economy improved by 6 to 7% compared with an existing commercial oil.
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Development of High Performance Heavy-Duty Diesel Engine Oil to Extend Oil Drain Intervals: 5W30 Fully Synthetic Oil Containing MoDTC

Mitsubishi Motors Corp.-Miki Sasaki, Yoshiaki Kishi, Tetsu Hyuga, Hiroshi Omata
Nippon Mitsubishi Oil Corp.-Shigeki Takeshima, Isao Kurihara, Akihiro Ohashi
Published 2000-06-19 by SAE International in United States
In this study, the oxidation stability, soot dispersancy, antiwear performance, and friction-reducing capability of friction modifiers (FMs) were evaluated, and an SAE 5W-30 fully synthetic oil with MoDTC type FMs was developed for heavy-duty diesel engines. In several engine tests, it was confirmed that the developed oil can double the oil drain interval in comparison with API CD SAE 30, even when EGR is applied, and improves the fuel efficiency.
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Effect of Lubricating Oils on Flaking of a Wet Clutch

Mitsubishi Oil Co., Ltd.-Tohru Matsuoka, Noboru Fujiwara, Akihiro Ohashi, Takeo Nakayama
  • Technical Paper
  • 958135
Published 1995-05-16 by Society of Automotive Engineers of Japan in Japan
As a study of the flaking mechanism of a wet clutch composed of paper-based facings, the flaking mechanism is classified into two types. One is carbonization of facings by friction heating, the other is cleavage of cellulose fiber by pressure. And further, the effect of additives against facings was investigated on a simple simulation test, in which an additive was found to inhibit degradation of cellulose fiber. It enabled to maintain the strength of cellulose fiber. Consequently a wet clutch has become longer- lived.