EP-4737271-A1 - STEERING DEVICE

EP4737271A1EP 4737271 A1EP4737271 A1EP 4737271A1EP-4737271-A1

Abstract

A steering device (10) includes a steering shaft (14) that is able to be operated in a state in which a power transmission path between the steering shaft (14) and steered wheels (34) is separated, a coupled rotating body (80) including a second opposing portion (82) of the steering shaft (14), and a rotation stopping body (60) including a first opposing portion (62) of the steering shaft (14). The first opposing portion (62) and the second opposing portion (82) come into contact with each other in the circumferential direction of the steering shaft (14). The first opposing portion (62) is provided with an annular elastic member (64) mounted to an outer periphery thereof, an outer face (62b) has a first radial-direction distance (R1), and an inner face (62c) has a second radial-direction distance (R3). A distal end face (82a) of the second opposing portion (82) has a third radial-direction distance (R2). The third radial-direction distance (R2) is greater than a value obtained by adding, to the second radial-direction distance (R3), half a difference between the first radial-direction distance (R1) and the second radial-direction distance (R2).

Inventors

IKEDA, KOSUKE
MIYAKE, Junya
TAMAIZUMI, TERUTAKA
Namikawa, Isao
ANRAKU, Koji
HOSONO, HIROSHI
OYA, TOSHIAKI

Assignees

JTEKT CORPORATION

Dates

Publication Date: 20260506
Application Date: 20240206

Claims (6)

A steering device including a steering shaft that is able to be operated in a state in which a power transmission path between the steering shaft and steered wheels of a vehicle is separated, the steering device comprising: a coupled rotating body configured to rotate about an axis of the steering shaft in conjunction with rotation of the steering shaft; and a rotation stopping body configured to stop the coupled rotating body by coming into contact with the coupled rotating body, wherein the rotation stopping body includes a first opposing portion that opposes the coupled rotating body when coming into contact with the coupled rotating body, the coupled rotating body includes a second opposing portion that opposes the rotation stopping body when coming into contact with the rotation stopping body, the first opposing portion and the second opposing portion are able to come into contact with each other in a circumferential direction of the steering shaft, the first opposing portion is provided with an annular elastic member mounted to an outer periphery of the first opposing portion, the first opposing portion includes an outer face situated on an outer side in a radial direction of the steering shaft and an inner face situated on an inner side in the radial direction of the steering shaft, the second opposing portion includes a distal end face situated on the outer side in the radial direction of the steering shaft, the outer face has a first radial-direction distance relative to the axis of the steering shaft, the inner face has a second radial-direction distance relative to the axis of the steering shaft, the distal end face has a third radial-direction distance relative to the axis of the steering shaft, and the third radial-direction distance is greater than a value obtained by adding, to the second radial-direction distance, half of a difference between the first radial-direction distance and the second radial-direction distance.
The steering device according to claim 1, wherein the third radial-direction distance is greater than or equal to a value obtained by adding, to the second radial-direction distance, three-quarters of the difference between the first radial-direction distance and the second radial-direction distance.
The steering device according to claim 2, wherein the third radial-direction distance is the same as the first radial-direction distance.
The steering device according to any one of claims 1 to 3, wherein the first opposing portion and the second opposing portion are configured to be able to come into contact with each other in a region including an approximately middle portion of the first opposing portion in the radial direction of the steering shaft.
The steering device according to any one of claims 1 to 3, wherein the annular elastic member is an O-ring.
The steering device according to any one of claims 1 to 3, further comprising: a housing that rotatably supports the steering shaft; a first rotating member linked to the steering shaft so as to rotate in conjunction with rotation of the steering shaft; and a second rotating member configured to rotate with the first rotating member, wherein the first opposing portion is provided on the housing, the second opposing portion is provided on the second rotating member, and the first rotating member is configured such that, in a state in which rotation of the second rotating member in a predetermined direction is restrained by the first opposing portion, and in a case in which the first rotating member is in contact with the second rotating member, rotation in the predetermined direction is restrained.

Description

TECHNICAL FIELD The present disclosure relates to a steering device. BACKGROUND ART Patent Document 1 below describes a device that mechanically limits a rotation region of a steering shaft in a steer-by-wire system. More specifically, this device includes a first rotating member that rotates coupled with the steering shaft, and a second rotating member that is rotated along with the first rotating member. This device also includes a restricting member that comes into contact with the second rotating member and restrains the second rotating member from rotating when a rotation angle of the second rotating member reaches a predetermined angle. When the first rotating member rotates a predetermined amount from a steering angle at which the rotation of the second rotating member is restrained by the regulating member, the first rotating member and the second rotating member then come into contact with each other such that the second rotating member restrains rotation of the first rotating member. This restrains the first rotating member from rotating. Furthermore, the same Document 1 describes that contact faces of the first rotating member and the second rotating member are covered with an elastic member (paragraph "0076"). Related Art Documents Patent Documents Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-69844 (JP 2020-69844 A) SUMMARY OF THE INVENTION Problem to be Solved by the Invention However, in a case in which the contact faces are covered with an elastic member as described above, the steering angle readily fluctuates at a point in time that the rotation of the steering shaft is restricted. Accordingly, precision of detecting an upper limit value of the rotation angle of the steering shaft decreases. Means for Solving the Problem One aspect of the present disclosure provides a steering device including a steering shaft that is able to be operated in a state in which a power transmission path between the steering shaft and steered wheels of a vehicle is separated. The steering device includes a coupled rotating body configured to rotate about an axis of the steering shaft in conjunction with rotation of the steering shaft, and a rotation stopping body configured to stop the coupled rotating body by coming into contact with the coupled rotating body, in which the rotation stopping body includes a first opposing portion that opposes the coupled rotating body when coming into contact with the coupled rotating body, the coupled rotating body includes a second opposing portion that opposes the rotation stopping body when coming into contact with the rotation stopping body, the first opposing portion and the second opposing portion are able to come into contact with each other in a circumferential direction of the steering shaft, the first opposing portion is provided with an annular elastic member mounted to an outer periphery of the first opposing portion, the first opposing portion includes an outer face situated on an outer side in a radial direction of the steering shaft and an inner face situated on an inner side in the radial direction of the steering shaft, the second opposing portion includes a distal end face situated on the outer side in the radial direction of the steering shaft, the outer face has a first radial-direction distance relative to the axis of the steering shaft, the inner face has a second radial-direction distance relative to the axis of the steering shaft, the distal end face has a third radial-direction distance relative to the axis of the steering shaft, and the third radial-direction distance is greater than a value obtained by adding, to the second radial-direction distance, half of a difference between the first radial-direction distance and the second radial-direction distance. BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] is a diagram illustrating a configuration of a steering system according to a first embodiment.[FIG. 2] is an exploded perspective view illustrating a configuration of part of a reactive force actuator illustrated in FIG. 1.[FIG. 3] is an exploded perspective view illustrating the configuration of part of the reactive force actuator illustrated in FIG. 2.[FIG. 4] is a diagram illustrating a relation between a housing protrusion and an intermediate stopper protrusion illustrated in FIG. 2 and FIG. 3.[FIG. 5] is a cross-sectional view illustrating the configuration of part of the reactive force actuator illustrated in FIG. 2.[FIG. 6] is a diagram illustrating operations of a stopper function of the reactive force actuator illustrated in FIG. 2.[FIG. 7] is a diagram illustrating a state in which the housing protrusion and the intermediate stopper protrusion are in contact with each other via an O-ring. MODES FOR CARRYING OUT THE INVENTION An embodiment will be described below with reference to the drawings. "Prerequisite Configuration" A steering device 10 of a vehicle illustrated in FIG. 1 is a steer-by-wire system. That is to