Nok Corporation

Namieki Osawa

Misaki Gushiken

Takeo Morimoto

The invention provides a cylinder head gasket installed by being sandwiched between a cylinder block and a cylinder head of an internal combustion engine. The cylinder head gasket has bore holes each having a circular plane at positions which are lapped over a combustion chamber in said cylinder block, and surface pressure generation portions constructed by three-dimensional shapes surrounding said bore holes at positions which are lapped over partition walls between the combustion chamber in said cylinder block and a water jacket portion. The surface pressure generation portions are arranged at fixed positions in a thickness direction of said partition wall and are arranged closer to the combustion chamber side or the water jacket portion side than the fixed positions in the thickness direction of said partition wall partly on a circumference around the bore holes. Therefore, bore deformation can be reduced.

Cylinder head gasket and method of manufacturing the same

The purpose of the invention is to make it possible to perform pressurized leak tests on open loop chain case-side oil seal beads. The purpose is achieved with a cylinder head gasket, which is fitted between the cylinder block and the cylinder head and seals the three-surface sealing region obtained by combining the cylinder block, the cylinder head and the chain case, and in which an open-loop chain case-side oil seal bead that is open toward the chain case is provided in the chain case-side end of the gasket. The cylinder head gasket is characterized in that a closed-loop leak test bead is provided in the cylinder head gasket along a chain case-side oil seal bead and a leak test pressure supply path for supplying leak test pressure to the space enclosed by the leak test bead is provided.

Growing community of inventors

Makinohara, Japan

Namieki Osawa