A bush bearing 7 includes a synthetic resin-made bush 17 having a circumferential groove 16 on an outer peripheral surface 15 thereof; an endless annular elastic member 18 fitted in the circumferential groove 16 of the bush 17; and a positioning means 19 for determining the position of the bush 17 in a B direction with respect to an inner peripheral surface 12 of a gear housing 6.

A housing extends in an axial direction of a rack shaft connected to a pinion shaft so as to cover at least the rack shaft, and has an end portion on which a cover member is fitted to cover the end portion. The housing includes a holding portion that has an inner side sinking in a radial direction of the housing, and holds the cover member, and a plurality of convex portions that protrude in the radial direction of the housing, and are circumferentially disposed on a downstream side of the holding portion in a fit-in direction of the cover member, while separating from the holding portion by a predetermined distance in the fit-in direction.

A rack bar includes a shaft portion and a rack toothed portion provided on the shaft portion. The rack toothed portion includes a plurality of rack teeth provided side by side in an axial direction of the shaft portion to mesh with a pinion gear. Each of the rack teeth includes a tooth tip portion, a contact face arranged obliquely relative to the axial direction and configured to contact the pinion gear, and a rounded corner portion between the tooth tip portion and the contact face. A first radius defining a central area of the rounded corner portion with respect to a tooth width direction is larger than a second radius defining another area of the rounded corner portion other than the central area.

In an embodiment of the invention, an end of travel stop is provided for a steering gear assembly having a housing, a rack, and a tie rod. The end of travel stop includes an annular body comprising a plurality of segments defining a first crenellated side of the annular body and a second crenellated side of the annular body. The stop is circumscribed over the rack and is oriented between the housing and the tie rod, and is configured to absorb an impact force transferred through the tie rod and to prevent overtravel of the rack.

Disclosed herein is an assembly structure of a dust cap being coupled to an assembly part of a rack housing which is open such that a steering shaft is inserted therethrough, wherein the dust cap includes a body provided in a hollow tube shape through which the steering shaft passes, a first coupling portion bent to extend outward from the body and press-fitted onto an outer circumferential surface of the assembly part, and a second coupling portion provided to be spaced a certain interval from the first coupling portion and inserted into the assembly part, and the second coupling portion is provided such that, when assembled to the assembly part, a gap is formed between the second coupling portion and an inner surface of the assembly part.