The truck pivots on a ballthrust race (slightly preloaded) with limit stops to prevent damage to the universal joints etc in the case of a derailment.
在推力球比赛的极限(略预装)卡车支点站，以防止损坏万向节的一出轨案等。
2
Thrustball bearings are designed for supporting axial forces; they are employed where axial forces are too high to be transmitted by radial bearings.
推力球轴承是专为支持轴向力设计的，他们用于轴向力过高，可以由径向轴承传播(的地方)。
3
Single-direction and double-direction angular contact thrustball bearings (Figures 1.50 and 1.51) are used for machine tool spindles requiring rigid axial guidance.