| 摘要 |
<p>A seal and dust guard assembly for use with a bearing cup (20) mounted on a trunnion (12) of a universal joint cross member (10) is disclosed. The trunnion (12) includes a cylindrical friction surface (12a), an inwardly tapered surface (12b), a cylindrical sealing surface (12c), and a cylindrical bearing surface (12d). A bearing cup (20) is rotatably mounted on the bearing surface (12d) of the trunnion (12). The outer surface of the bearing cup (20) has an annular groove (20d) formed circumferentially thereabout. Between the open end (20b) of the bearing cup (20) and the groove (20d), the outer surface of the bearing cup (20) is reduced in diameter. An annular seal assembly (25) is provided for sealing the bearing cup (20) on the trunnion (12). The seal assembly (25) includes an elastomeric seal (27) having a first lip (27a) adapted to engage the sealing surface (12c) and a second lip (27b) adapted to engage the tapered surface (12b). The seal assembly (25) further includes a plastic dust guard (30) having an axially extending portion (30a) which extends over the reduced diameter portion (20e) of the bearing cup (20). The axially extending portion (30a) includes a flange (30c) which extends radially inwardly into the groove (20d) formed in the bearing cup (20) so as to releasably secure the dust guard (30) thereto. The dust guard (30) also includes a radially inwardly extending portion (30b) which terminates in an inner friction surface (30d). The dust guard friction surface (30d) frictionally engages the trunnion friction surface (12a) so as to releasably secure the bearing cup (20) to the trunnion (12).</p> |
