STEERING SYSTEM
First Claim
1. A steering system comprising:
- a steered shaft that is movable to be advanced and retracted in an axial direction;
a cylindrical nut member made of metal and threadably engaged with a spiral screw groove formed in an outer peripheral surface of the steered shaft via a plurality of balls;
a pulley made of a resin and externally fitted with the nut member so as not to be rotatable relative to the nut member;
a belt wound around the pulley;
an electric motor that rotates the pulley and the nut member via the belt; and
an elastic member, at least a part of which is disposed between an outer peripheral surface of the nut member and an inner peripheral surface of the pulley in an elastically deformed state, whereinthe elastic member presses the inner peripheral surface of the pulley radially outward using a restoring force of the at least part of the elastic member in the elastically deformed state.
1 Assignment
0 Petitions
Accused Products
Abstract
A steering system includes: a rack shaft movable in the axial direction; a cylindrical nut member made of metal and threadedly engaged with a spiral screw groove formed in the outer peripheral surface of the rack shaft via a plurality of balls; a pulley made of a resin and externally fitted with the nut member so as not to be rotatable relative to the nut member; a belt wound around the pulley; an electric motor that rotates the pulley and the nut member via the belt; and a retention ring, a plate spring portion of which is disposed between the outer peripheral surface of the nut member and the inner peripheral surface of the pulley in an elastically deformed state. The retention ring presses a second planar portion formed on the inner peripheral surface of the pulley radially outward using a restoring force of the plate spring portion.
6 Citations
7 Claims
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1. A steering system comprising:
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a steered shaft that is movable to be advanced and retracted in an axial direction; a cylindrical nut member made of metal and threadably engaged with a spiral screw groove formed in an outer peripheral surface of the steered shaft via a plurality of balls; a pulley made of a resin and externally fitted with the nut member so as not to be rotatable relative to the nut member; a belt wound around the pulley; an electric motor that rotates the pulley and the nut member via the belt; and an elastic member, at least a part of which is disposed between an outer peripheral surface of the nut member and an inner peripheral surface of the pulley in an elastically deformed state, wherein the elastic member presses the inner peripheral surface of the pulley radially outward using a restoring force of the at least part of the elastic member in the elastically deformed state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification