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EP-4737270-A1 - STEERING DEVICE

EP4737270A1EP 4737270 A1EP4737270 A1EP 4737270A1EP-4737270-A1

Abstract

A steering device (10) includes a steering shaft (14) that is able to be operated in a state in which power transmission from steered wheels of a vehicle is interrupted. The steering device includes a coupled rotating body (82) that rotates about an axis of the steering shaft in conjunction with rotation of the steering shaft, and a rotation stopping portion (62) that stops the coupled rotating body by coming into contact with the coupled rotating body. A groove and an elastic member attached to the groove are provided to at least one of an opposing portion of the coupled rotating body and an opposing portion of the rotation stopping portion that face each other when the coupled rotating body and the rotation stopping portion come into contact. The opposing portion of the coupled rotating body and the opposing portion of the rotation stopping portion include contact faces configured to be able to come into contact with each other due to the elastic member being deformed.

Inventors

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

Assignees

  • JTEKT CORPORATION

Dates

Publication Date
20260506
Application Date
20230818

Claims (8)

  1. A steering device including a steering shaft that is able to be operated in a state in which power transmission from steered wheels of a vehicle is interrupted, the steering device comprising: a coupled rotating body that rotates about an axis of the steering shaft in conjunction with rotation of the steering shaft; and a rotation stopping portion that stops the coupled rotating body by coming into contact with the coupled rotating body, wherein the coupled rotating body includes an opposing portion that faces the rotation stopping portion when in contact with the rotation stopping portion, the rotation stopping portion includes an opposing portion that faces the coupled rotating body when in contact with the coupled rotating body, a groove and an elastic member attached to the groove are provided to at least one of the opposing portion of the coupled rotating body and the opposing portion of the rotation stopping portion, and the opposing portion of the coupled rotating body and the opposing portion of the rotation stopping portion include contact faces configured to be able to come into contact with each other due to the elastic member being deformed.
  2. The steering device according to claim 1, wherein the elastic member is a member having viscosity and elasticity.
  3. The steering device according to claim 1, wherein the elastic member is an O-ring.
  4. The steering device according to claim 3, wherein, in a cross-section of the O-ring taken along a plane orthogonal to a circumferential direction, a proportion of a cross-sectional area of the O-ring as to a cross-sectional area of the groove is 0.7 or less.
  5. The steering device according to claim 3, wherein: a first dimension that is a dimension of the groove in a first direction is smaller than a second dimension that is a dimension of the groove in a second direction; in a cross-section taken along a plane orthogonal to a circumferential direction of the O-ring, the first direction is a direction in which the contact face of the coupled rotating body is displaced when the contact face of the coupled rotating body and the contact face of the rotation stopping portion transition from a contact state to a non-contact state; and the second direction is a direction orthogonal to the first direction in the cross-section taken along the plane orthogonal to the circumferential direction of the O-ring.
  6. The steering device according to claim 1, further comprising: a first rotating member linked to the steering shaft; and a second rotating member that rotates in conjunction with rotation of the steering shaft, wherein the coupled rotating body 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 rotation stopping 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.
  7. The steering device according to claim 1, wherein the elastic member is provided on the coupled rotating body.
  8. The steering device according to claim 1, wherein the elastic member is provided on the rotation stopping portion.

Description

TECHNICAL FIELD The present disclosure relates to a steering device. BACKGROUND ART The following Patent Document 1 describes a device that mechanically limits a rotation range of a steering shaft in a steer-by-wire system. More specifically, this device includes a first rotating member that rotates in conjunction with the steering shaft, and a second rotating member that rotates 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 the steering angle at which rotation of the second rotating member is restrained by the restricting 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. Also, the same Document 1 describes that contact faces of the first rotating member and the second rotating member are each 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 contact faces are covered with an elastic member as described above, the steering angle readily fluctuates at a point in time of the rotation of the steering shaft being restricted. Accordingly, precision of detecting an upper limit value of a rotation angle of the steering shaft decreases. Means for Solving the Problem In one aspect of the present disclosure, a steering device is provided. The steering device includes a steering shaft that is able to be operated in a state in which power transmission from steered wheels of a vehicle is interrupted. The steering device includes a coupled rotating body that rotates about an axis of the steering shaft in conjunction with rotation of the steering shaft, and a rotation stopping portion that stops the coupled rotating body by coming into contact with the coupled rotating body. The coupled rotating body includes an opposing portion that faces the rotation stopping portion when in contact with the rotation stopping portion. The rotation stopping portion includes an opposing portion that faces the coupled rotating body when in contact with the coupled rotating body. A groove and an elastic member attached to the groove are provided to at least one of the opposing portion of the coupled rotating body and the opposing portion of the rotation stopping portion. The opposing portion of the coupled rotating body and the opposing portion of the rotation stopping portion include contact faces configured to be able to come into contact with each other due to the elastic member being deformed. 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 cross-sectional view illustrating the configuration of part of the reactive force actuator illustrated in FIG. 2.[FIG. 5] is a diagram illustrating operations of a stopper function of the reactive force actuator illustrated in FIG. 2.[FIG. 6A] is a cross-sectional view taken along line 6-6 in FIG. 3.[FIG. 6B] is a cross-sectional view of a comparative example with respect to the configuration in FIG. 6A.[FIG. 7] is a cross-sectional view of an end stopper and so forth.[FIG. 8] is an exploded perspective view illustrating a configuration of part of a reactive force actuator according to a second embodiment. MODES FOR CARRYING OUT THE INVENTION <First Embodiment> A first 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 type system. The steering device 10 includes a steering wheel 12, a steering shaft 14, a reactive force actuator 20, and a steering actuator 30. The steering shaft 14 is linked to the steering wheel 12. The reactive force actuator 20 is used to apply a force that counters force exerted by a driver when operating the steering wheel 12. The reactive force actuator 20 includes a reactive force motor 22, a reactive force inverter 24, and a reactive force reduction mechanism 26. The reactive force motor 22 applies a steering reactive force, which is a force that counters steering, to the steering wheel 12 via the steering shaft 14. The reactive force motor 22 is linked to the steering shaft 14 via