Power steering system for motor car, has annular sealing element arranged outside bearing allows rotating part with helical configuration around rack, and sealing unit arranged between housing and rack track rod

摘要

The system has a rack (3) slidably received in a steering housing (2). An assist motor acts on the rack through a transmission device with a ball screw. The rack provides a rack portion (10) with external thread having circulation of balls. A sealing unit is arranged between the housing and a rack track rod. An annular sealing part comprises a rotating part with a helical configuration that cooperates with a thread of the rack portion. The annular sealing element is arranged outside a bearing that allows the rotating part with a helical configuration around the rack.