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在气缸盖与气缸体之间,以往是采用有一定厚度的软质材料制成的软衬垫来密封。然而,这种软衬垫式的密封结构,由于密封各部位的表面压力不均而使缸体与缸盖之间的间隙误差加大,给气体的密封带来不利影响。 在采用压缩率较低而耐久性较高的金属薄板制作气缸垫时,缸体与缸盖之间的间隙误差减小,但金属面彼此间的磨合性较差,且对由于爆发而产生的振动的随动性亦较差,容易降低气密性,造成漏气。
In the past between the cylinder head and the cylinder block, a soft liner made of a soft material with a certain thickness was used for sealing. However, this soft gasket-type sealing structure increases the gap error between the cylinder block and the cylinder head due to the uneven surface pressure at each part of the seal, adversely affecting the sealing of the gas. The gap between the cylinder block and the cylinder head is reduced when producing a cylinder head gasket using a metal sheet having a low compression ratio and a high durability. However, the weldability of the metal surfaces is poor, Vibration follow-up is also poor, easy to reduce air tightness, resulting in leaks.