| 摘要 |
An unlimited sliding ball spline assembly, i.e., a ball spline assembly, has through holes for non-loaded balls formed in an outer sleeve on the extensions of lines connecting loaded balls, spline shaft bearing surfaces for loaded balls and the non-loaded balls. Its contact angle is rendered as close as possible to the direction of torque to make the torque transfer greater. Each of the through holes for the non-loaded balls are axially spaced from its adjacent through holes a distance which is required for allowing the balls to change their travelling direction. The outer sleeve has grooves in its inside wall surface. On the side walls of the grooves is formed an axially-extending curved bearing surface for loaded balls. A ball holder with slits is located within the outer sleeve which prevents loaded balls travelling on the bearing surfaces of the outer sleeve from falling down. Tongues are disposed at each end of each of the slits. A pair of end members are also attached to both end faces of the outer sleeve. Each end member defines grooves in the inner surface thereof, which grooves are required to change the travelling direction of loaded or non-loaded balls which are guided by the ball holder.
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