Patent ID: 8123230

Claim:
A cylinder head gasket adapted to be interposed between a cylinder block and a cylinder head, comprising: a first gasket base plate which has a combustion chamber hole for connecting to a combustion chamber defined by a cylinder, the first gasket base plate comprising (i) a first full bead near the combustion chamber hole, the first full bead being swollen upward and (ii) a first half bead that is swollen upward, at a position that is farther from the combustion chamber hole than the first full bead is; a second gasket base plate which is positioned below the first gasket base plate, and which has a combustion chamber hole for connecting to the combustion chamber at a position corresponding to the combustion chamber hole of the first gasket base plate, the second gasket base plate comprising (i) a second full bead near the combustion chamber hole, the second full bead being positioned opposite the first full bead and being swollen away from the first gasket base plate, in a direction opposite to a swelling direction of the first full bead and (ii) a second half bead that is positioned opposite the first half bead and swollen away from the first gasket base plate, in a direction opposite to a swelling direction of the first half bead, at a position that is farther from the combustion chamber hole than the second full bead is; a third gasket base plate which is positioned below the second gasket base plate and which has a combustion chamber hole at a position corresponding to the combustion chamber hole of the first gasket base plate, the third gasket base plate comprising (i) a third full bead near the combustion chamber hole, the third full bead being positioned opposite the second full bead and being swollen toward the second gasket base plate, in a direction opposite to a swelling direction of the second full bead, and (ii) a third half bead that is positioned opposite the second half bead and swollen toward the second gasket base plate, in a direction opposite to a swelling direction of the second half bead, at a position that is farther from the combustion chamber hole than the third full bead is; a thickness adjusting plate which is positioned between the second gasket base plate and the third gasket base plate, the thickness adjusting plate having a width that extends from a periphery portion of the combustion chamber hole to the cylinder head gasket periphery portion; and a pressure increasing plate which is positioned between the second gasket base plate and the third gasket base plate, the pressure increasing plate having (i) a first edge near a position near the combustion chamber hole of the second gasket base plate and (ii) a second edge between the second full bead and the second half bead.