这样的结构改善了摇臂轴的支撑刚度以及阀驱动系统的动力性能，并且减少了零件的数量和人工的工时数量。
This structure improves the support rigidity of the rocker shaft and the dynamic characteristics of the valve drive system, and reduces the number of components and the number of working man-hours.
数个油道形成在构成内燃机的阀驱动系统的一部分的摇臂轴的轴体中。
A plurality of oil passages are formed in a shaft body of a rocker shaft, which partially constitutes a valve drive system of an internal combustion engine.
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