| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball spline that thins the wall thickness of a casing and reduces the outer diameter of the casing to attain downsizing, and reduces the number of components to reduce processing cost.SOLUTION: A ball spline includes a pair of arm parts 10 provided at the circumferential opposite positions of end caps 4 constituting a slider 2, and extending in a longitudinal direction, and the arm parts 10 are respectively inserted into a pair of recess grooves 12 formed in the longitudinal direction of the opposite positions of an inner peripheral surface 26 of a casing 3. Into a pair of holes 9 formed in the recess parts 12 of the casing 3 in a separated manner, a projection part 11 provided in the arm part 10 of the end cap 4 is fitted, the end caps 4 are positioned in the casing 3 in a circumferential direction and axial direction, and the end caps 4 are respectively fixed to both end surfaces 28 of the casing 3. |
