| 摘要 |
<p>A wheel and axle set for a railcar truck includes one wheel fixed to the axle and another wheel loose on the axle so that the latter wheel can rotate relative to the axle. This loose wheel arrangement permits the wheels on opposite sides of the truck to rotate at different speeds as the truck negotiates curved sections of track, and this in turn prevents wheel slippage and greatly reduces rail wear, particularly where the rails are used by heavily loaded trains. The axle is a standard AAR roller bearing axle having raised wheel seats set inwardly from its journals. The fixed wheel is pressed onto one of the wheel seats, while a sleeve is pressed over the other wheel seat. The sleeve serves as a mount for a pair of tapered roller bearings which carry the loose wheel. The two bearings for the loose wheel are indirectly mounted on the sleeve which has a flange at its inner end and a detachable retaining ring at its outer end, and both the flange and ring serve as abutments for the back faces of the indirectly mounted bearing cones. The sleeve is further provided at its outer end with an inwardly directed lip which engages the wheel seat fillet at the outer end of the raised wheel seat. Hence, the lip locates the sleeve on its seat and further prevents the sleeve from moving inwardly under the heavy thrust loading encountered by the wheel flange in negotiating curves.</p> |
