Metal laminated type of cylinder head gasket

Abstract

A metal laminate cylinder head gasket includes first and second metal plates laminated together. The first metal plate has a combustion hole, and an asymmetrical bead formed around the combustion hole. The asymmetrical bead has a large radius portion with a width (a) at a side of the combustion hole from a top of the bead, a small radius portion with a width (b) at the other side from the top of the bead, and a smallest radius (R). The second metal plate is laminated at a projecting side of the asymmetrical bead. A relationship between (a) and (b) is (a)>(b), the smallest radius (R) is (R)>=0.5 mm, and a relationship between the width (a) and the radius (R) is (a)>=2(R).

Description

technical field [0001] The present invention relates to a metal laminated cylinder head gasket interposed between a cylinder block and a cylinder head of an engine. A metal laminated cylinder head gasket that balances the surface pressure on both ends and suppresses crimping marks on the cylinder block and cylinder head due to surface pressure. Background technique [0002] While engine performance has continued to improve, efforts have been made to strengthen the sealing performance between the cylinder block and cylinder head. For example, in the metal laminated gasket disclosed in Japanese Patent Laid-Open No. Hei 4-219572 of Patent Document 1, as Figure 4 As shown, in a cross section passing through the combustion chamber hole 31 , the fixing bolt hole 32 , and the cooling water hole 33 formed in the packing 30 , an asymmetric protrusion 35 a is formed around the combustion chamber hole 31 of the substrate 35 . In addition, this metal laminated gasket is configured by ...

AI Technical Summary

Problems solved by technology

But when Figure 4 In the known gasket, since the inner end 35b of the asymmetric protrusion is located in the wedge-shaped stopper 36a (thickness increased portion), and the outer end 35c is located in the general part (non-thickness increase) outside the wedge-shaped stopper 36a increased portion), so even with this asymmetric protrusion 35a, the radius of curvature of the protrusion on the side of the increased thickness portion is set to a larger radius of curvature to reduce the spring constant, and the portion of the non-thickness increased portion The radius of curvature of the protrusion is set to a smaller radius of curvature to increase the spring constant, and the surface pressure of the end of the protrusion on the side of the increased thickness will still increase due to its thickness. Therefore, the gasket such as As described in this patent document, the sealing performance can be improved, but it does not consider how to balance the surface pressure of the two ends of the sealing protrusion around the combustion chamber hole.

Images