在发动机中，凸轮轴上的凸轮控制进气门和排气门的开启和关闭。
In the engine, cams on the CAM shaft cause the intake and exhaust valves to open.
一些高性能发动机有两个单独的凸轮轴，分别负责开关进气门和排气门。
Some high-performance engines have two separate camshafts, one for each set of inlet and exhaust valves.
进、排气门的开闭由凸轮轴控制。
Inlet and outlet doors opening and closing controlled by the camshaft.
排气气门（5）借助于一包括一液压气门辅助控制单元（12）的机械的连接机构（7，8）与凸轮轴相连 接。
The exhaust valve (5) is connected with a camshaft by means of a mechanical connecting mechanism (7, 8) including an hydraulic valve auxiliary control unit (12).
排气气门（5）借助于一包括一液压气门辅助控制单元（12）的机械的连接机构（7，8）与凸轮轴相连 接。
The exhaust valve (5) is connected with a camshaft by means of a mechanical connecting mechanism (7, 8) including an hydraulic valve auxiliary control unit (12).
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