| 摘要 |
<p>This bearing device comprises an outer wheel (1) having a plurality of lines of rolling surfaces (1a, 1b) formed in the internal circumferential surface thereof, an inner wheel (3) having a rolling surface (3a) formed in the external circumferential surface thereof in such a manner as to confront the rolling surface (1b) of the outer wheel (1), an axle (2) having a rolling surface (2a) confronting the rolling surface (1a) of the outer wheel (1) and a press fitting portion (2c) for press fitting the inner wheel (3) which are formed continuously in the external circumferential surface thereof, the press fitting portion (2c) being so formed via a holder portion (2b), a plurality of lines of balls (4a, 4b) interposed between the outer wheel (1) and the axle (2) and the inner wheel (3), retainers (5a, 5b) for retaining the balls (4a, 4b), and a nut (6) screwed over the external circumferential surface of an end of the axle (2). An end surface (2e) of the press fitting portion (2c) of the axle (2) is worked with high precision so as to constitute a reference surface for measuring a negative gap of the bearing after the constituent parts are assembled together. The inner wheel (3) is press fitted into the press fitting portion (2c) of the axle (2) and secured by means of the nut (6) which is screwed on a thread portion (2d) of the axle (2). In this axle bearing device, the inner wheel (3) is in abutment with the shoulder portion (2b) of the axle (2), leaving no gap therebetween, and the bearing negative gap is secured.</p> |
