Nippon Oil Corporation

Nissan Motor Company Limited

Other

Shigeki Takeshima

Makoto Kano

Yutaka Mabuchi

Takahiro Hamada

Shozaburo Konishi

Yoshiteru Yasuda

Kenji Tsushima

Shigeki Matsui

Takafumi Ueno

Koji Hoshino

Takao Ishikawa

Jean Michel Martin

Kiyotaka Nakamura

The invention provides a low-friction sliding mechanism, a low-friction agent composition, a friction reduction method, a manual transmission and a final reduction gear unit that can exert very excellent low friction characteristics to sliding surfaces present under various applications, and, in particular, that have more excellent low friction characteristics than that of a combination of an existing steel material and an organic Mo compound. The low-friction sliding mechanism has an oxygen-containing organic compound or an aliphatic amine compound interposed between sliding surfaces that a DLC coated sliding member and a sliding member form. The low-friction agent composition contains an oxygen-containing organic compound or an aliphatic amine compound. The friction reduction method includes supplying the low-friction agent composition between sliding surfaces that a DLC coated sliding member and a sliding member form. The manual transmission includes, as at least one of sliding members, a DLC coated sliding section. The final reduction gear unit includes, as at least one of sliding members, a DLC coated sliding section.

Low-friction sliding mechanism, low-friction agent composition and method of friction reduction

A low-friction sliding mechanism includes first and second sliding members having respective sliding surfaces slidable relative to each other and a lubricant applied to the sliding surfaces of the first and second sliding members. At least the sliding surface of the first sliding member is made of a diamond-like carbon material, and at least the sliding surface of the second sliding member is made of either an aluminum-based alloy material, a magnesium-based alloy material or a diamond-like carbon material. The lubricant contains a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.

Low-friction sliding mechanism

The present invention provide a lubricating oil composition suitable for internal combustion engines, which composition is excellent in thermal/oxidation stability and can inhibit the increases of the viscosity and acid number even in the presence of NOx and can be used for a long period of time or provide a lubricating oil composition particularly suitable for diesel or direct injection engines equipped with an exhaust-gas after-treatment device such as DPF or various catalysts, which composition is excellent in high-temperature detergency and base number retention properties and further can achieve the effect of inhibit wear caused by soot contamination in the oil occurring significantly when the content of phosphorus compounds such as ZnDTP is decreased, at a high level and can inhibit the exhaust-gas after-treatment device from being adversely affected. The lubricating oil composition comprises a lubricating base oil containing, a specific amount of a base oil with specific properties, and two or more types of additives selected from specific additives.

Lubricating oil composition

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Yokohama, Japan

Shigeki Takeshima