| 摘要 |
A drive assembly is adapted for engagement with a driven clutch plate of a heavy-duty truck. The drive assembly incorporates a drive pin comprising a shank inserted into a flywheel, and a spindle which extends radially inwardly from the flywheel. A drive head is rotatably mounted on the spindle, which incorporates a groove containing a compressible friction ring for assuring frictional retention of the head. The drive pin includes a shoulder situated intermediate shank and spindle, the shoulder incorporating a frustoconical portion to provide a tapered bearing surface for rotatably supporting the drive head on the spindle. The shoulder also contains a radially extending annulus which faces the shank, the annulus adapted for limiting depth of insertion of the shank into the flywheel. In the same preferred form, the drive head has a tapered counterbore to matingly engage the frustoconical portion, and also contains a plurality of chamfered surfaces adjacent opposed ends of the head. The chamfered surfaces facilitate engagement of the head into a drive slot of a driven plate during clutch assembly.
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