| 摘要 |
PROBLEM TO BE SOLVED: To provide a gasket which can furthermore surely equalize the surface pressure on a thick portion. SOLUTION: Bores 1 for combustion chambers are opened in the base plate of the gasket 10, and first thick portions 5 are formed so as to surround the bores 1 for combustion chambers. The first thick portions 5 are formed on the whole peripheries of the end edge of the bores 1 for combustion chambers by folding back the edge portions of the bores 1 for combustion chambers upward. The portions of the first thick portions 5 continued to the flat portions of the base plate are called lower side base plate portions 11, and the portions continued to the lower side base plate portions 11 and overlap with the lower side base plate portions 11 by being folded back are called folded-back portions 12. Recessed portions 11a are formed on the overlapping surface of the lower side base plate portions 11 so as to elongate in the circumferential direction. When a fastening load is applied to the first thick portions 5 in this state, the thickness of the lower side base plate portions 11 at the portion, where the fastening load is heavy, decreases by its deformation. As a result, the variation of the thickness is naturally caused according to the magnitude of the surface pressure, and the surface pressure can be equalized. COPYRIGHT: (C)2007,JPO&INPIT
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