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康明斯柴油机气缸盖为整体式结构,在气缸盖内布置有进、排气道及冷却水套。喷油器、摇臂、进气歧管、排气歧管、节温器和气门室罩等主要零部件,都固装在气缸盖上。目前生产的康明斯柴油机气缸盖是不镶气门座圈和气门导管的,它们都是在气缸盖上直接加工出来的。进、排气门座表面经过高频加热、感应淬火和空气自然冷却,其硬度不小于HRC50,有效淬硬深度为 0．89mm。但在柴油机使用中,气门座常由于柴油机温度过高或
Cummins diesel engine cylinder head is a one-piece structure, arranged in the cylinder head into the exhaust passage and cooling water jacket. Fuel injector, rocker arm, intake manifold, exhaust manifold, thermostat and valve cover and other major components are fixed on the cylinder head. Cummins diesel engine cylinder head is currently produced is not inlaid valve seat and valve guide, they are directly on the cylinder head machined out. Into the exhaust valve seat surface after high-frequency heating, induction hardening and natural air cooling, the hardness of not less than HRC50, effective quenching depth of 0.89mm. However, diesel engine use, valve seat often due to the diesel engine temperature is too high or