Importance

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Abstract

In a method of assembling a double-row ball bearing of a preload-type, which includes a step of inserting a plurality of balls in a crescent-shaped gap formed between an outer race and an inner race which is deviated with respect to the outer race, a step of distributing the balls between the outer and inner races at equal intervals, and a step of disposing the outer race and the inner race concentrically with respect to each other, a step of producing a temperature difference is performed before the step of distributing the balls at equal intervals. In the step of producing temperature difference, the outer race is heated by a heating coil surrounding the outer race to expand the outer race. As a result, the negative gaps which have been existing between the outer and inner races and the balls are reduced or removed, and thus, the distribution of the balls at equal intervals can be achieved without causing flaws by dragging of the balls and without causing indentations in the raceway surfaces of the outer and inner races and in the surface of the balls. After the distribution of the balls, the heating of the outer race is stopped to allow it to return to a room temperature to thereby restore the negative gaps and to apply a preload to the bearing.

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First Claim