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本发明的专利说明书论述了往复运动活塞式发动机的气缸盖。为了与缸套、缸体或曲轴箱连接起来,这种气缸盖的四周分布有螺栓孔。气缸盖,特别是用铝合金铸造的轻金属气缸盖,它与气缸套或气缸体之间的密封表面是一个重要区域,由于布置了进气口和排气口,缸盖各处的温度就产生了差异,排气口处的温度最高。因而在这些区域热膨胀最大。而通常用于连接的螺钉、螺栓与螺母的热膨胀比铝合金要小得多,致使高温区的螺栓或螺母的支承面
The patent specification of the present invention discusses the cylinder head of a reciprocating piston engine. In order to connect with the cylinder liner, cylinder block or crankcase, bolt holes are distributed around the cylinder head. The cylinder head, especially the light metal cylinder head cast in aluminum alloy, is an important area with the sealing surface between the cylinder liner and the cylinder block. The temperature of the cylinder head is generated due to the arrangement of the intake port and the exhaust port The difference, the highest temperature at the exhaust. As a result, thermal expansion is greatest in these areas. Screws, bolts and nuts, which are commonly used for joining, have a much smaller thermal expansion than aluminum alloys, so that the bearing surface of the bolt or nut in the high temperature region