Patent ID: 8342974
Filing Date: 2013-01-01
Classification: F16C

Abstract:
1. A ball spline comprising: a spline shaft having a plurality of linear spline grooves extending in an axial direction which are formed on an outer peripheral face of the spline shaft, a spline nut which is formed with ball circulation passages corresponding to the spline grooves of the spline shaft and through which the spline shaft is passed, and a plurality of balls which are disposed in the ball circulation passages of the spline nut, wherein the spline nut includes: wherein the spline shaft is formed with the spline grooves on a circumferential face thereof having no projected part, and wherein the connecting part of the cage of the spline nut includes a turning ball receiving part for receiving the balls which are turning from the no-load raceway part, and a turned ball receiving part continued from the turning ball receiving part for receiving the balls which are forwarded to the main passage after turning, and an outer diameter of the turning ball receiving part is made larger than an outer diameter of the turned ball receiving part.