Patent ID: 11873031
Assignee: NSK LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A rack and pinion steering gear unit comprising:
a housing having a rack housing having a tubular shape with both sides open in an axial direction of the rack housing and including an engaging concave section on an inner peripheral surface thereof, and a pinion housing;
a rack bush having a tubular body having a substantially cylindrical shape and an engaging convex section protruding outward in a radial direction from an outer peripheral surface of the tubular body and arranged inside the engaging concave section, the rack bush fitted inside the rack housing;
a rack shaft having rack teeth, supported by an inner peripheral surface of the rack bush slidably in the axial direction, and arranged inside the rack housing; and
a pinion shaft having pinion teeth that mesh with the rack teeth on an outer peripheral surface thereof, and rotatably supported inside the pinion housing;
wherein
the engaging convex section is provided in a portion of the rack bush that is located on an opening side of the rack housing;
the engaging concave section comprises a bottom surface inclined in a direction outward in a radial direction as going toward one side in the axial direction of the rack housing;
the engaging convex section comprises a top surface inclined in a direction outward in the radial direction as going toward the one side in the axial direction of the rack housing, with the top surface pressed radially outward with respect to the bottom surface of the engaging concave section, a bottom surface disposed radially inward with respect to the top surface and contacting an outer surface of the rack shaft, and a first surface facing the one side in the axial direction of the rack housing and configured by a flat plane that is orthogonal to a center axis of the rack bush,
the engaging concave section comprises a second surface facing the other side in the axial direction of the rack housing and configured by a flat surface that is orthogonal to a center axis of the rack housing, and
the first surface is pressed in the axial direction against the second surface.