RACK BUSH AND STEERING SYSTEM

摘要

A rack bush for supporting a rack shaft in a rack-and-pinion steering system so that the rack shaft slides in an axial direction thereof includes a teeth side support portion and a back side support portion. Rack teeth are formed in a first area of an outer circumferential surface of the rack shaft. The teeth side support portion contacts a second area of the outer circumferential surface to support the rack shaft from a teeth side where the rack teeth are formed. The second area lies adjacent to the first area in the axial direction. The back side support portion contacts a third area of the outer circumferential surface to support the rack shaft from a back side other than the teeth side. The third area is positioned out of the first area in a circumferential direction around an axis of the rack shaft.

主权项

1. A rack bush, for supporting a rack shaft equipped in a rack-and-pinion steering system so that the rack shaft slides in an axial direction of the rack shaft, rack teeth being formed in a first area of an outer circumferential surface of the rack shaft, the rack bush comprising:
a teeth side support portion configured to bring into contact with a second area of the outer circumferential surface to support the rack shaft from a teeth side where the rack teeth are formed, the second area lying adjacent to the first area in the axial direction, and a back side support portion configured to bring into contact with a third area of the outer circumferential surface to support the rack shaft from a back side which is a side other than the teeth side, the third area lying in a position out of the first area in a circumferential direction around an axis of the rack shaft.