| 摘要 |
A spindle is rotatably mounted within a housing on spaced-apart antifriction bearings. The inner races of the bearings are held solidly against shoulder portions of the spindle and the outer race of the front bearing is mounted against a shoulder in the housing. The outer race of the rear bearing is supported in a circular diaphragm concentric with the spindle axis, which may be flexed along the axis to load the bearings against one another. A hydraulic chamber is formed against the diaphragm to load the diaphragm at preselected intervals, and a stop plate is provided in the housing to limit movement of the outer race is a distance corresponding to a maximum preload in the bearings. When the stop plate is contacted, hydraulic pressure may be greatly increased to further load the diaphragm and its corresponding outer race solidly against the stop plate without further increasing the preload in the bearing set, providing a high holding force resistant to spindle pull out. |
