Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Honda Giken Kabushiki Kaisha

Kenji Fujiki

Hirotsugu Kudo

Takahiro Naka

Masaki Kanehiro

Masayuki Ueno

Yusuke Endo

Osamu Murakami

Takuya Sugino

Moriyoshi Awasaka

Seiji Kosaka

Toshiyuki Inaba

Shogo Kawajiri

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

An engine including an engine oil return passage for returning engine oil from a cylinder head side to an oil pan having a balance shaft forming a balancing system for said engine; and a housing disposed below a crankshaft for accommodating rotatably therein the balance shaft. A part of the engine oil return passage is provided in the housing.

Balance shaft, housing for balance shaft and engine oil return passage

A joint portion of an oil pump shaft and a balancer shaft (output-side balancer shaft ) is provided in an open space between opposite surfaces of a sidewall of an oil pump housing and a sidewall (a bearing portion) of a balancer shaft housing . The joint portion of the oil pump shaft and the balancer shaft is comprised of a pair of engageable portions provided at each end of the balancer shaft and the oil pump shaft , respectively. The engageable portions are disengageably engaged with each other in radial directions of the shafts . The joint portion can be seen from the outside, and thus a joining operation can be performed with ease.

Joint structure for oil pump shaft and balancer shaft

Selectively operable first and second exhaust valves are provided for every combustion chamber in an engine. Branch pipes of a first intake manifold are connected to first exhaust ports opened and closed by the first exhaust valves, and branch pipes of a second exhaust manifold are connected to second exhaust ports opened and closed by the second exhaust valves. An adsorbing trap is provided in an aggregated pipe of the first exhaust manifold and a catalytic converter is provided in a common exhaust pipe connected to the aggregated pipes of the first and second exhaust manifolds. Only the first exhaust valves are operated to open and close at a low temperature of the adsorbing trap to permit the exhaust gas to flow into the first exhaust manifold. Thus, hydrocarbons (HCs) in the exhaust gas are adsorbed into the adsorbing trap at the low temperature and the heat of the exhaust gas is effectively utilized to promote the activation of the catalytic converter. As the temperature increases sufficiently to activate the catalytic converter, the HCs adsorbed by the adsorbing trap are desorbed, which restores the HCs adsorbing capability of the adsorbing trap, and the exhaust gases are treated directly by the catalytic converted by operating the second exhaust valves while resting the first exhaust valves.

Exhaust emission control system in engine

Growing community of inventors

Saitama, Japan

Kenji Fujiki