Toyota Jidosha Kabushiki Kaisha

Taiho Kogyo Co., Ltd.

Tonen Corporation

Takashi Kikuchi

Yasuhiro Hikita

Tatsuhiro Terada

Katsuya Arai

Toshimitsu Shiba

Masao Takahashi

Kenyu Akiyama

Takashi Shimura

Satoshi Asano

Masao Yamazaki

Yutaka Matsuyama

Junichi Natsume

Shigeyuki Yoshizawa

A sliding bearing is constructed by an upper split bearing half and a lower split bearing half. The upper split bearing half has a sliding surface, in which an oil groove which allows a lubricating oil to flow therein is formed over the entire circumferential extent of the sliding surfaced. The oil groove extends through a crush relief to be open to a junction area, and the oil groove has a bottom which is formed so that a portion disposed toward the junction area as considered in the circumferential direction of the crush relief is located closer to the center of the upper split bearing half in comparison to a central portion. An ingress in large quantities of foreign particles within the oil groove onto the sliding surface of the sliding bearing and into a connecting rod bearing after passing through a lubricating oil feed passage is suppressed, and an oil leakage through the crush relief is reduced, allowing a lubricating oil pressure to be secured and augmented.

Sliding bearing

A bearing (crank bearing) is constituted of an upper bearing () that is attached to a cylinder block, a lower bearing () that is attached to a crank cap, and a bearing filter () for filtering engine oil. The bearing filter () is fitted in an oil hole (A) of the upper bearing ().

Bearing with lubrication oil filter

A lubricating oil composition comprising a lubricating base oil, an amine salt of molybdic acid, and a molybdenmn dithiocarbamate and/or a molybdenum dithiophosphate, wherein the content of molybdenum derived from the amine salt of molybdic acid is 200 ppm by weight or more, the content of molybdenum derived from the molybdenum dithiocarbamate and/or the molybdenum dithiophosphate is 200 to 700 ppm by weight, and the total content of molybdemum is 400 ppm by weight or more. The lubricating oil composition can maintain the effect to decrease friction in engines for a long time without being affected by nitrogen oxide gases.

Lubricating oil composition

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Toyota, Japan

Takashi Kikuchi