Cylinder head gasket

Abstract

A cylinder head gasket is formed of at least one metal plate for forming the gasket. The gasket includes cylinder bores, and sealing devices or beads to surround the cylinder bores. A notch portion for reducing surface pressure is provided at a flat portion of the at least one metal plate where a rigidity of the sealing device is not affected.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view showing a metal gasket of a first embodiment according to the present invention;

FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 1;

FIG. 3 is a partial plan view showing a metal gasket of another structure of a second embodiment according to the present invention; and

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3.

Claims

1. A cylinder head gasket, comprising: at least one metal plate for forming the gasket,cylinder bores formed in the at least one metal plate,sealing means formed at the metal plate to surround the cylinder bores for sealing around the cylinder bores, anda notch portion for reducing surface pressure provided at a flat portion of the at least one metal plate where a rigidity of the sealing means is not affected.

2. A cylinder head gasket according to claim 1, wherein said sealing means is a bead integrally formed with the at least one metal plate.

3. A cylinder head gasket according to claim 2, further comprising bolt holes formed in the at least one metal plate and arranged to surround the cylinder bores, said notch portion being provided at a portion between two cylinder bores adjacent to each other and between one of the bolt holes and an edge of the at least one metal plate.

4. A cylinder head gasket according to claim 1, wherein said notch portion is provided to partially surround the bolt hole located on a corner of the at least one metal plate.

5. A cylinder head gasket according to claim 3, wherein said cylinder head gasket comprises first and second metal plates, said first metal plate having beads as the sealing means and said second metal plate having said notch portion for reducing surface pressure.

6. A cylinder head gasket according to claim 5, wherein said cylinder head gasket further comprises a third metal plate laminated under the second metal plate and having beads as the sealing means.

7. A cylinder head gasket according to claim 6, further comprising half beads surrounding the bolt holes, said notch portion being providing outside the half beads.