Rack and pinion type power steering apparatus

A rack bush in a rack and pinion type power steering apparatus, comprising:

• a rack bush arranged and constructed to sidably support a rack shaft with respect to a support body in an axial direction of the shaft, the rack bush shaped as an approximately cylindrical body made of a synthetic resin or the like, the rack bush being cut to a predetermined portion along an axial direction of the cylinder body alternately from both end portions in the axial direction of the cylinder body, the rack bush being provided with a plurality of grooves at a uniform interval in a circumferential direction of the cylinder body, and a center portion in the axial direction in an inner peripheral portion of the cylinder body being formed as a bulge portion curved toward the axial direction.

A rack bush in a rack and pinion type power steering apparatus, comprising:

• a rack bush arranged and constructed to slidably support a rack shaft with respect to a support body in an axial direction of the shaft, the rack bush shaped as an approximately cylindrical body made of a synthetic resin or the like, the rack bush being cut along an axial direction of the cylinder body except both end portions in the axial direction of the cylinder body, the rack bush being provided with a plurality of grooves in a circumferential direction of the cylinder body, and a center portion in the axial direction of a structure body element of the cylinder body extending in the axial direction between the grooves pinched by the grooves being formed as a bulge portion curved toward the axial direction.