一般内燃机的进排气门是菌形的,由凸轮轴带动.定时往复运动,考特斯国际有限公司(Coates International Ltd.)创造了一种球形旋转气门气缸盖的发动机,球形气门夹在两块铝气缸盖之间,并和旋转的钢轴连接在一起.在气门中做出的进气道或排气道,在吸气冲程时,使燃烧室与进气装置连通,排气冲程时燃烧室则与排气装置接通,球形旋转气门气缸盖有两种类型,一种是一根轴,在四冲程发动机上,其转速是曲轴转速的一半;另一种有两根轴,其转速是曲轴转速的四分之一.考特斯发动机已通过了1992年美国环境保护局排放标 The intake and exhaust valves of internal combustion engines are usually bacteria-shaped and are driven by camshafts. Regular reciprocating motions, Coates International Ltd. has created an engine with a spherical rotary valve cylinder head, Block aluminum cylinder head between and connected with the rotating steel shaft made in the valve inlet or exhaust passage in the intake stroke, the combustion chamber with the intake device, the exhaust stroke The combustion chamber is connected to the exhaust, and the spherical rotary valve cylinder cover has two types, one is a shaft, which on the four-stroke engine is half the speed of the crankshaft and the other has two shafts Speed ​​is a quarter of the crankshaft speed. Kautex engines have passed the 1992 EPA emissions standards