Patent ID: 9500157
Filing Date: 2016-11-22
CPC Classification: F02F,F16J

Claim Text:
1. A cylinder head gasket installed between a cylinder block and a cylinder head and sealing a three-surface sealing portion which is constructed by a combination of cylinder block, the cylinder head and a chain case, the cylinder head gasket comprising: a chain case side end portion including a first protruding portion located on a first end of the chain case side end portion and a second protruding portion located at an opposite second end of the chain case side portion; a first open-loop seal bead that is open toward the chain case; a second open-loop seal bead that is open toward the chain case; a first closed-loop seal bead located within the first open-loop seal bead; a second closed-loop bead located within the second open-loop seal bead; and a leak test pressure supply path which is provided so as to supply leak test pressure toward a space area which is surrounded by at least one of the first and second closed-loop seal beads, wherein at least one of the first and second closed-loop seal beads is configured to contain the leak test pressure that is introduced through the leak test pressure supply path during a leak test of the cylinder head gasket; and an entirety of the first open-loop seal bead and an entirety of the first closed-loop seal bead are formed in the first protruding portion, and a portion of the second open-loop seal bead and a portion of the second closed-loop seal bead are formed in the second protruding portion.