| 摘要 |
A linear ball bearing housing assembly includes a unitary central body and two plastic end pieces fastened to the body by roll pins. A channel defines a closed loop within the housing assembly for recirculating balls. A longitudinal opening in one side of the housing assembly allows the balls to contact a straight raceway so that the balls can roll easily along this way as the bearing travels back and forth relative to the way. The bearing may be mounted on the machine member which moves relative to the stationary way, or alternatively, the way may be movable relative to the bearing mounted upon a stationary machine member. A bail extends in front of the longitudinal opening to retain the balls when the bearing unit is not positioned against the opposing way. The bail is secured by molded grooved sockets inside of the end pieces. In order to adjust pre-loading between the balls and their races, an eccentric post whose lower portion fits in a hole in the machine member and whose upper portion fits in the housing assembly is adjusted. After this pre-load has been adjusted, a wedge member is tightened against the eccentric, thereby fixing the desired amount of pre-loading. The bearing is then secured in position by tightening machine screws. Removable interchangeable race elements made from wear-resistant material are secured in place be retainer ears formed on the inside of the end pieces.
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