Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Jidosha Engineering Kabushiki Kaisha

Koichi Yoshimoto

Toshihiko Oka

Satoshi Matsui

Yoshinori Sakurai

Shuji Nagano

Tetsushi Nagira

Kenichi Morishima

Akimasa Yamamoto

A pair of exhaust ports () have flat portions () formed on respective inner peripheral surfaces thereof and facing in directions opposite to each other. An intervening cooling water passage () is formed between the flat portions () when a cylinder head () is cast.

Cooling water passage structure for an engine

The bottom surfaceof the cylinder headis formed by an intake-side bottom surfaceand an exhaust-side bottom surfaceon which an intake portand an exhaust portare formed respectively. Further, a first wallformed between an intake-side water jacketand the intake-side bottom surfaceis larger in thickness than a second wallformed between an exhaust-side water jacketand the exhaust-side bottom surface. This structure can reduce an amount of HC included in exhaust gas.

Cylinder head structure

A valve system for an internal combustion engine in which accumulating means can be provided without deteriorating the ease of assembly is provided. A variable valve control mechanism provides control to selectively open and close intake valves and exhaust valves. Pressurized oil supplied to the variable valve control mechanism is accumulated in an accumulator. The body of the accumulator is inserted into and fixed in a hole of a cylinder head. The length of a gap formed between the upper part of the body of the accumulator and a flat plate is set to be shorter than the length of a screw part of the body of the accumulator. Therefore, the accumulator can be replaced and maintained easily, and can be prevented from falling off.

Valve system for internal combustion engine

Growing community of inventors

Moriguchi, Japan

Koichi Yoshimoto