顶点：轴承中心线和圆锥轴承滚子表面延长线的交点。
APEX : The common point on the axis of a bearing where angular lines of each of the various tapered roller surfaces meet.
圆锥滚子轴承的负荷作用于轴承在某一个角度，即所谓的阿尔法对轴中心线的接触角，（参见下图）转移。
Taper Roller Bearings transfer the loads acting on the bearing at a certain angle, the so called alpha contact angle towards the shafts centre line, (see sketch below).
在剪板工作中，通过关节轴承的自动调节，可自动完成滑块与活塞杆中心线重合，使滑块运行平稳灵活。
The central lines of the glide block and the piston rod can automatically overlapped by the auto adjustment of the oscillating bearing so as to make the running of the glide block stable and flexible.
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