the shell (metal casing) in which a train of gears is sealed
例句
用作名词 (n.)
When designing a planet gear box, in the case of gear shifted, the power must be analyzed to make sure if there are unreasonable and inner circle power. 摘要行星变速箱设计过程中,在挂接不同挡位时,各挡功率流向是否合理,是否存在封闭功率流,是必须解决的问题。