Abstract
This paper deals with the fatigue life distribution, basic dynamic load rating and the reliability factor of a reformed type linear motion ball bearing. The trial productions of the bearing, which. are made use of commercial type standard bearings (nominal diameter = 30 mm and number of ball rows= 6), are performed. Both end portions of outer sleeve raceway surfaces of the bearing are reformed and rounded out by 1.4 mm radii so as to improve the bearing lives. The following is a summary of the results : (1) The life values of the reformed type bearing are increased by 26% in comparison with those of the commercial type bearing. The experimental value of the basic dynamic load rating of the reformed type bearing almost agree with the theoretical one. (2) The life distribution state of the 59 bearings conforms very well to the three parameters Weibull distribution function in which a minimum life is introduced. Consequently, reliability factors can be decided clearly almost all over the failure regions. In addition, it is found that its value on 100% reliability nearly equals to 0.4.
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