轴承滚针的凸度设计，决定了滚动体与滚道间的接触压力分布，影响其性能和寿命。
Crown Drop of a Needle roller decides the pressure distribution between roller and raceway, capability and life.
滚针离合器轴承是可单向传递轴和轴承座之间的扭矩，而反方向允许自由转动的一种复合功能轴承。
The needle roller clutch bearing is a kind of compound function bearing which transmits torque between the shaft and housing in one direction and allows free overrun in the opposite direction.
如果不是这样，必须使对中滚针轴承承受额外的径向载荷。
If this is not the case, the alignment needle roller bearing must be subjected to an additional radial load.
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