POWER UNIT WITH VARIABLE VALVE TIMING SYSTEM

The present subject matter relates to a power unit with a variable valve timing system. The power unit (100) includes a cylinder head assembly (102). A variable valve timing system disposed on a cylinder head assembly (102) includes a first cam (142) for actuating one or more first valves (132) by a first rocker arm (144) pivotable about a first axis (S-S '). A second cam (152) is used to selectively actuate one or more first valves (132) by a second rocker arm (154) pivotable about a first axis (S-S '). An engagement unit (145, 160, 162) is disposed about the first axis (S-S ') configured to selectively engage the second rocker arm (154) with the first rocker arm (144). The present invention provides a system with lower inertia as a result of the mass accumulating near the first axis (S-S '), making the power unit easy to operate and operating at higher speeds. 本主题涉及一种具有可变气门正时系统的动力单元。动力单元(100)包括气缸盖组件(102)。设置在气缸盖组件(102)上的可变气门正时系统包括第一凸轮(142)，用于通过能够围绕第一轴线(S-S')枢转的第一摇臂(144)致动一个或多个第一气门(132)。第二凸轮(152)用于通过能够围绕第一轴线(