Abstract
In this paper, the life tests of two types of ball splines (nominal diameter 20 mm, number of ball rows 3) are carried out. One is a commercial type which is on the market now. The other is a reformed type which is rounded out by 3 mm in radius at both end portions of the outer sleeve ball grooves so as to improve the ball spline life. The test series for the commercial type and reformed type are made up of 125 ball splines divided into 3 groups and of 30 ball splines divided into 2 groups, respectively. The results are as follows: (1) The life distributions of the ball splines were well conformed to the 3-parameters Weibull distribution function with a Weibull slope 10/9. (2) In the case of the commercial type ball splines, flakings occurred at both end portions of the outer sleeve ball grooves. But, in the case of the reformed type ball splines, flakings occurred at the inner portions of the outer sleeve ball grooves which were parted from both end portions by about 4 to 5 mm in distance. As the result, the median lives of the reformed type ball splines increased about 2 to 3 times compared with those of the commercial type ball splines.
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