主减速器（final reduction drive） 在驱动桥内能够将转矩和转速改变的机构。基本功用是将来自变速器或者万向传动装置的转矩增大，同时降低转速并改变转矩的传递方向。主减速器由一对或几对减速齿轮副构成。动力由主动齿轮输入经从动齿轮输出。
双级主减速器 double reduction final drive ; Double step gears
贯通式主减速器 thru-drive ; penetrable final drive
单级主减速器 single reduction final drive ; Single step gears
主减速器壳 carrier case
主减速器后桥 final drive
主减速器模块 final drive ; Single Ratio
主减速器和差速器 final drive and differential
后桥主减速器 Rear axle final drive
双级双速主减速器 two speed double reduction final drive
上置式双级主减速器 top mounted double reducton final drive
悬架连接着主减速器（后桥）总成和车身。
The suspension connects the final drive assembly to the car body.
汽车传动系特别是传动轴与主减速器常产生异常响声。
Abnormal noise often occurs in motor vehicle transmission system especially in propeller shaft and final reduction gear.
通过万向节轴将齿轮传递的力矩分配给前轴主减速器或后轴差速器。
Distributes the moment released by the gear via the cardan shafts to the frontaxle final drive or rear axle differential.
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