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CN-122003552-A - Rotation transmission device

CN122003552ACN 122003552 ACN122003552 ACN 122003552ACN-122003552-A

Abstract

The present invention relates to a rotation transmission device. The rotation transmission device (100) is provided with an input member (110), an intermediate member (120), an output member (130), a first urging member (210), a cam mechanism (300), and a housing (101). The first urging member (210) connects the intermediate member (120) and the output member (130), and urges the intermediate member (120) toward the input member (110). The intermediate member (120) has an intermediate body (121), a rotational friction portion (125), and a second urging member (220). The rotary friction part (125) is disposed at a position facing the fixed friction surface (109). The second urging member (220) connects the intermediate body section (121) and the rotary friction section (125), and urges the rotary friction section (125) toward the fixed friction surface (109). The elastic coefficient of the first urging member (210) is larger than the elastic coefficient of the second urging member (220).

Inventors

  • WATARAI KENTARO
  • KENICHI AOTA
  • Haruki yoshiharu

Assignees

  • 株式会社捷太格特

Dates

Publication Date
20260508
Application Date
20231101

Claims (5)

  1. 1. A rotation transmission device is provided with: an input member that rotates about a central axis extending in a first direction by a torque input from a driving source; an intermediate member coaxially arranged with the input member on one side of the input member in the first direction; An output member disposed coaxially with the input member and the intermediate member on one side of the intermediate member in the first direction; a first urging member that connects the intermediate member and the output member and urges the intermediate member toward the input member; a cam mechanism disposed between the input member and the intermediate member and transmitting rotation of the input member to the intermediate member, and A housing which houses the intermediate member and the cam mechanism, holds the input member and the output member rotatably, and has a fixed friction surface, The intermediate member includes: An intermediate body portion which is disposed at a position where the central shaft passes through and to which the first urging member is fixed; a rotary friction part arranged at a position opposite to the fixed friction surface in the first direction, and A second urging member that connects the intermediate body portion and the rotational friction portion and urges the rotational friction portion toward the fixed friction surface, The elastic coefficient of the first force application member is larger than that of the second force application member, When the input member rotates, the cam mechanism moves the rotation friction portion via the second biasing member in a direction away from the fixed friction surface by maintaining a state in which the rotation of the input member is transmitted to the intermediate body portion and moving the intermediate body portion in a direction toward the output member.
  2. 2. The rotation transmission device according to claim 1, further comprising: and an angular ball bearing disposed between the input member and the housing on the other side of the input member in the first direction, the angular ball bearing supporting the input member rotatably relative to the housing and immovably in the first direction.
  3. 3. The rotation transmitting device according to claim 1 or 2, wherein, The first urging member is a plate-like elastic member that connects the intermediate body portion and the output member in a second direction orthogonal to the first direction, and that faces the first direction in a thickness direction.
  4. 4. The rotation transmitting device according to claim 1 or 2, wherein, The second biasing member is a plate-shaped elastic member that connects the intermediate body portion and the rotational friction portion in a second direction orthogonal to the first direction and that faces the first direction in a thickness direction.
  5. 5. The rotation transmission device according to claim 1 or 2, further comprising: a gasket disposed between the intermediate body and the output member, The intermediate body portion and the output member are pressed against each other in the first direction via the spacer, and movement in a direction approaching the output member is restricted.

Description

Rotation transmission device Technical Field The present invention relates to a rotation transmission device. Background Conventionally, there is a device for transmitting a rotational force supplied from a drive source such as a motor to a predetermined object, wherein the device is configured to shut off an input (reverse input) of the rotational force (torque) transmitted from the object to the drive source. For example, patent document 1 discloses a power transmission mechanism for a drive device provided in an automobile. In this power transmission mechanism, when the input-side member receives an input rotational power from the drive source and rotates, a part of the input rotational power is converted into an axial force by fitting the concave cam and the convex cam in a substantially V shape, and the intermediate member is axially displaced toward the output side against the spring force. The friction clutch is released by axial displacement of the intermediate member toward the output side, and the intermediate member is rotatable relative to the stationary member. On the other hand, when the drive source is stopped, the intermediate member is axially displaced toward the input side by the pressing force of the spring, and the friction clutch is operated, so that the intermediate member is restricted in the rotational direction with respect to the stationary member. Patent document 1 Japanese patent laid-open No. 2000-346099 In the conventional power transmission mechanism described above, the intermediate member has a sliding spline hole on the inner periphery, and the sliding spline hole is fitted to a sliding spline formed on the outer periphery of the output-side member, so that the intermediate member is attached to the output-side member so as not to be rotatable and so as to be axially movable. Therefore, in the case where the intermediate member moves in the axial direction with respect to the output-side member, friction is necessarily generated between the intermediate member and the output-side member. This causes a decrease in torque transmission efficiency. Disclosure of Invention The present application has been made in view of the above problems, and an object of the present application is to provide a rotation transmission device capable of suppressing a decrease in torque transmission efficiency. A rotation transmission device according to one embodiment of the present invention includes an input member that rotates about a central axis extending in a first direction by a torque input from a drive source, an intermediate member that is disposed coaxially with the input member on one side of the input member in the first direction, an output member that is disposed coaxially with the input member and the intermediate member on one side of the intermediate member in the first direction, a first urging member that connects the intermediate member and the output member and urges the intermediate member toward the input member, a cam mechanism that is disposed between the input member and the intermediate member and transmits rotation of the input member toward the intermediate member, and a housing that houses the intermediate member and the cam mechanism, holds the input member and the output member rotatable, and has a fixed friction surface, the intermediate member having an intermediate body portion that is disposed at a position where the central axis passes and is fixed with the first urging member, a rotation friction portion that is disposed at a position where the intermediate member passes, and urges the rotation friction portion toward the intermediate member, and a rotation coefficient of the intermediate member is held toward the intermediate member by the elastic member, and the elastic friction portion is disposed at a position where the intermediate member is opposite to the first friction portion and the rotation friction portion is held toward the intermediate member, and the rotary friction portion is moved away from the fixed friction surface via the second biasing member. According to the rotation transmission device of the present invention, a decrease in torque transmission efficiency can be suppressed. Drawings Fig. 1 is a schematic diagram schematically showing a configuration of a steering device and its surroundings according to an embodiment. Fig. 2 is a schematic cross-sectional view showing the configuration of the rotation transmission device according to the embodiment. Fig. 3 is an exploded perspective view of the rotation transmission device according to the embodiment. Fig. 4 is an exploded perspective view of the intermediate member of the embodiment. Fig. 5 is a perspective view showing the external appearance of the input member and the first cam portion according to the embodiment. Fig. 6 is a first partial cross-sectional view of the rotation transmission device of the embodiment. Fig. 7 is a second partial cross-sectional view of the rotation tr