Honda Motor Co., Ltd.

Seiji Kosaka

Masaki Kanehiro

Masayuki Ueno

Shigenao Maruyama

Kenji Fujiki

Yoshito Tsukamoto

Atsuki Komiya

Morimasa Nagata

Yasuhiro Kawamura

Osamu Murakami

Shuichi Moriya

Junya Negishi

Yoshita Tsukamoto

Disclosed is a piston cooling device wherein the cooling efficiency of a piston is improved by oil injected from an oil jet and supplied to a cooling passage provided in the piston, and the amount of cooling oil is reduced when an internal combustion engine is operated at maximum output. The piston cooling device is provided with a piston for an internal combustion engine, in which a circumferential passage and a cooling passage having an inlet passage and an outlet passage are provided, and an oil jet for injecting oil from an injection port to the inlet passage. The oil jet injects oil at every stroke of the piston so that a two-phase plug flow composed of gas and oil is formed in the cooling passage at least when an internal combustion engine is operated at maximum output.

Piston cooling device

An oil level sensor for detecting an oil level is arranged in an engine oil pan. The oil level sensor includes a mounting section and a sensing section. An air hole is formed at an upper end of a cover member of the sensing section. The air hole is surrounded by a tubular portion of a shield member attached to a baffle plate of the oil pan. Therefore, any splashed engine oil in the oil pan is restricted from entering the cover member of the sensing section through the air hole. Also, a clearance (&#x3b1;) for venting air is formed between the tubular portion and the baffle plate.

Oil pan for engine having a shield member covering an air hole of an oil sensor

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Saitama, Japan

Seiji Kosaka