Seal structure of tie rod mounting portion in center take-off type power steering apparatus

Abstract

A seal structure of a tie rod mounting portion in a center take-off type power steering apparatus structured such that respective inner ends of a pair of right and left tie rods are swingably connected to a leg portion of a T-shaped connection member. Both arm portions of the connection member are respectively connected to a rack shaft by a bolt passing through a guide shoe sliding within a notch groove formed along a lengthwise direction of a gear box housing, the respective inner ends of a pair of right and left tie rods laterally move in accordance with a lateral motion of the rack shaft while being guided by the guide shoe, a center portion of a dust boot is gripped between the guide shoe and both of the arm portions of the connection member by being passed through by the bolts. A collar is fitted between the guide shoe and the bolt and between the dust boot and the bolt so as to override between the rack shaft, the guide shoe and the dust boot, and one end portion of the collar protrudes from the dust boot so as to be brought into contact with the arm portion of the connection member, wherein a stepped recess portion to which both of the arm portions of the connection member are fitted, and an annular protruding wall which surrounds one end portion of the collar and is brought into contact with the arm portion of the connection member are respectively formed in the dust boot.