CROSS MEMBER UNIT FOR UNIVERSAL JOINTS

摘要

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