One day, physicist Ho-Kei Chan of Trinity College Dublin was playing with steel ball bearings, trying to pack them into a little cylindrical tube in the most efficient way possible.
一天，都柏林大学圣三一学院的物理学家陈和奎正拿着一些铁珠玩耍，试图将他们以最有效的方法装进一个小的圆柱型管子里。
One-way, two-way pressure ball bearing cage generally use steel stamping molding, large size or special use of the bearings are made of brass or mild steel turning cage.
单向、双向压力球轴承保持架一般采用钢板冲压成型，大尺寸或特殊用处的轴承则采用黄铜或软钢车削保持器。
The thrust bearings are capable only to sustain the axial loads, with low limit speed. They have two stress modes, I. E. One-way thrust and two-way thrust.
推力轴承只能承受轴向负荷，极限转速低。有单向推力和双向推力两种受力方式。
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