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US4114643A Valve operating mechanism of internal combustion engine 失效
内燃机阀门操作机构

Valve operating mechanism of internal combustion engine
摘要:
The valve lift and the valve timing of the intake and exhaust valves of an internal combustion engine are changed in response to an engine operating condition. Furthermore, the intake and exhaust valves are maintained closed during deceleration of the engine.
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