Honda Motor Co., Ltd.

Taichi Yoshikawa

Noriaki Fujii

Keiko Yoshida

Shigekazu Tanaka

Akinori Maezuru

Keitaro Nakanishi

Koichi Eto

Jiro Fujimoto

Hisashi Sato

Nobuyuki Yoshida

Hiroshi Takemoto

The EGR cooling structure includes a cylinder block having cylinders, and a cylinder head into which exhaust gas exhausted from the cylinders is collected. An exhaust emission control device is provided for purifying the exhaust gas exhausted from the cylinder head, and an EGR pipe is provided through which EGR gas of a part of the purified exhaust gas is introduced into an intake system. An EGR cooler is provided in the EGR pipe and cools the EGR gas with the cooling liquid. An exhaust gas passage leading from the cylinders to the exhaust gas purification device is curved when seen from a side, and the EGR cooler is disposed in the space surrounded by the cylinder block, the cylinder head, and the exhaust gas purification device.

EGR cooling structure

In a variable stroke engine assembly for a front engine, front wheel drive vehicle, an engine output shaft (OS), a variable stroke control mechanism (, CR), an actuator (AC) and a starter motor (SM) are laid out in a favorable manner so that the general outer profile of the engine assembly can be made free from excessive protrusions, an increase in the engine room space requirement is avoided, layout freedom can be enhanced, and the cooling performance for the actuator can be improved.

Variable stroke engine assembly

In a variable stroke engine comprising a plurality of links () connecting a piston () with a crankshaft (), a control member () disposed on an engine main body so as to be moveable in two directions over a prescribed range relative to the engine main body, a control link () connecting one of the plurality of links with the control member and an actuator (AC) for displacing the control member, the actuator comprises a ratchet mechanism that utilizes a force transmitted from the piston to the control member as an actuating force for the control member. By providing a spring member (, SP,) that applies a biasing force to the control member, an appropriate actuating force can be applied to the control member in either direction.

Variable stroke engine

A variable stroke characteristic engine is provided in which a piston () and a crankshaft () are linked to a control shaft () via a variable stroke link mechanism (LV), and the variable stroke link mechanism (LV) is operated by an actuator (AC) that drives the control shaft () to thus make the stroke travel of the piston () variable, wherein a housing (HU) of the hydraulic actuator (AC) for operating the variable stroke link mechanism (LV) is provided in a bearing member () of a lower block () supporting the crankshaft (), and the housing (HU) is thus made small, thereby suppressing any increase in the dimensions of the engine. Furthermore, a hydraulic switching valve unit () for controlling operation of the hydraulic actuator (AC) is directly mounted on the housing (HU), thereby enhancing the responsiveness of the hydraulic actuator (AC).

Variable stroke

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.

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Wako, Japan

Taichi Yoshikawa