Honda Motor Co., Ltd.

Koichi Eto

Kenji Abe

Keiko Yoshida

Akinori Maezuru

Shigekazu Tanaka

Kouichi Ikoma

Masakazu Kinoshita

Taichi Yoshikawa

Hisashi Sato

Koichi Ikoma

Yoshihiro Okada

Kazuhiko Iso

A water jacket includes: a cooling channel through which a coolant flows, the cooling channel being formed in a cylinder block in which a plurality of cylinders are formed such that the cooling channel is positioned outside the cylinders; and a cooling groove (slit) through which the coolant flows, the cooling groove being formed between adjacent ones of the cylinders. When a slit end portion is viewed in sectional view in a direction in which the cylinders are arranged, the slit end portion and a cylinder-block inner wall are continuous with each other via an inclined portion inclined so as to become thicker toward the cylinder-block inner wall.

Water jacket

Secondary vibration generated accompanying reciprocation of a piston () of a multi-link variable compression ratio engine (E) can be eliminated effectively, even when the direction of the secondary vibration is inclined relative to a cylinder axis (L), by inclining the direction (shown by arrow) of an excitation force generated by a secondary balancer system () so that it coincides with the direction of the secondary vibration. The secondary balancer system () is formed by supporting balancer weights () on a pair of balancer shafts () rotating in directions opposite to each other, and by displacing the phases of these balancer weights () the direction of the excitation force generated can be inclined so as to coincide with the direction of secondary vibration of the engine (E).

Engine vibration elimination system and variable stroke characteristic engine

A stroke characteristic variable engine comprising a primary link connected to a piston which is slidably fitted in a cylinder, a secondary link connecting the primary link with a crankshaft and a tertiary link connected to the primary link or the secondary link at one end and to an engine main body via a control shaft at the other end thereof. An oil level position of engine oil stored in an oil pan is set such that at least part of the control shaft is submerged in the engine oil, whereby since oil stored within the oil pan can be used as it is, the lubrication around the control shaft can be ensured in a simplified configuration.

Stroke characteristic variable engine

In a variable stroke-characteristic engine for a vehicle, a control shaft and a control link are disposed on a front side of a vehicle body with respect to a crankshaft. An actuator for driving the control shaft is disposed on an outer surface of an engine block on the front side of the vehicle body. Thus, the actuator projects as much as possible from a position of the engine block toward the front side of the vehicle body so that traveling wind from ahead of the vehicle is effectively applied to the actuator to enhance the cooling effect. Hence, any temperature increase of the actuator is suppressed. Moreover, the actuator is disposed as far as possible from an exhaust manifold that is heated to a high temperature by the heat of an exhaust gas.

Variable stroke-characteristic engine for vehicle

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Wako, Japan

Koichi Eto