Cross member unit for universal joints

摘要

A cross member unit for universal joints has a cross member (6) with four trunnions (17). Each two trunnions define a common longitudinal axis (7). Each trunnion (17) has an end face (18), a first sealing face (21) and a pre-sealing face (24). The pre-sealing face (24) is remote from the end face 18 and has a diameter increasing relative to the first sealing face (18). A bearing bush (9) is on each trunnion (17). Each bearing bush (9) has an open end 29 and has rolling contact members 27 rotatably supporting the trunnion (17) around the longitudinal axis (7) of the trunnion (17). An annular seal (30) is provided in each bearing bush 9. The annular seal (30) is held in the bearing bush 9 by a press fit. The annular seal (30) includes an annular carrier (31) which projects from the open end (29) of the bearing bush (9). The annular seal includes at least one first sealing lip (35) which is in contact with the first sealing face (18) of the trunnion (17). The annular seal has a pre-seal (38) in the form of a sealing lip or bead which is in contact with the pre-sealing face (24) of the trunnion 17. An end face (32) is on the carrier (31). The end face (32) is remote from the end face (18) of the trunnion (17). An annular gap (26) is formed between the end face (32) and a radial face (40) of a shoulder (39) of the trunnion (17).