The tradition relative motions hole and axle has certain gap specifically,between hole and axle the friction of motion coefficient is big, after use copper (steel) ball retainer, causes the axis and the hole immediate contact, but is among through by the micro full copper (steel) the bad ball, thus the movement precision is high, the rolling friction replaced the sliding friction, the trundle has been flexible, the friction coefficient was small, the service life was long, in both had the rotation, and to have the motion situation, with the axle sleeve which and the axis or refueled without the oil match, although could satisfy, but the movement precision was low, with rolling bearing, only energySatisfies the axis relative rotation the situation, but copper (steel) ball retainer, then the above two conditions satisfy, at present has widely applied in flushes the pould frame coldly, the high accuracy engine bed, the engine bed appendix as well as the request high accuracy axial axle diameter to at the same time movement situation.
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