center pinion

基本解释

Some cars have variable-ratio steering, which uses a rack-and-pinion gear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.
有些車的轉曏系角傳動比是可變的，這種轉曏器採用齒輪齒條式，它在中間而不是外部，有不同的齒密度（每寸齒數）。
The hypoid gear is in common use today due mainly to the fact that the offset pinion allows the propeller shaft to be set below, (for cars) or above, (for commercial vehicles) the crown wheel center.
現在的主減速器普遍使用準雙曲麪圓錐齒輪，這主要是因爲主動錐齒輪的偏移允許轎車上傳動軸佈置得比從動錐齒輪低一些，而商用車上又允許佈置得比從動錐齒輪高一些。