| 摘要 |
A ball spline bearing has an outer sleeve provided with a plurality of load-carrying ball grooves formed in the inner peripheral surface thereof at a predetermined circumferential pitch so as to extend in the axial direction thereof, and a plurality of unloaded ball passages formed in the solid part thereof at a predetermined circumferential pitch so as to extend in the axial direction of the same. The outer sleeve has a hollow which receives a spline shaft which is provided in the outer peripheral surface thereof with a plurality of load-carrying ball grooves, the load-carrying ball grooves in the outer sleeve and the load carrying ball grooves in the spline shaft opposing to each other to form therebetween load-carrying ball passages. A pair of side covers are attached to both open ends of the outer sleeve. Each of the side cover is provided in the inner surface thereof with a plurality of ball turning grooves which interconnect the load-carrying ball passages to corresponding unloaded ball passages so that the outer sleeve, the spline shaft and the side covers in cooperation form a plurality of ball recirculation passages. A plurality of ball trains each consisting of a multiplicity of balls are loaded in corresponding ball recirculation passages.
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