Cylinder head gasket

  • US 9,500,157 B2
  • Filed: 03/02/2012
  • Issued: 11/22/2016
  • Est. Priority Date: 11/02/2011
  • Status: Active Grant
First Claim
Patent Images

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.

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