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.
针滚的表面是平直的或圆形的。
滚针轴承是拥有薄的，长的滚动体的圆柱滚子轴承。
The needle roller bearing is a cylindrical roller bearing with thin, long rolling elements.
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