Webbing take-up device

Patent metadata

Field	Value
Publication number	US-10000184-B2
Application number	US-201615162162-A
Country	US
Kind code	B2
Filing date	May 23, 2016
Priority date	May 27, 2015
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A webbing take-up device includes a spool that takes up webbing worn by an occupant, an input gear that is rotated by rotation force being transmitted, a spool gear that rotates the spool by being rotated, and a second clutch that is provided between the input gear and the spool gear, and that transmits rotation force of the input gear to the spool gear by being rotated by the input gear. The webbing take-up device further includes a sub clutch spring that is provided between the input gear and the second clutch, that transmits rotation force of the input gear to the second clutch when the input gear is rotated toward one side, and that shuts off transmission of rotation force of the input gear to the second clutch when the input gear is rotated toward another side.

First claim

What is claimed is:

1. A webbing take-up device comprising:
a spool that takes up a webbing worn by an occupant;
a motor that outputs rotation force by being operated;
a first rotating body that is provided in a transmission route of rotation force between the motor and the spool, that is rotated by rotation force outputted by the motor being transmitted thereto;
a second rotating body that is provided between the first rotating body and the spool in the transmission route that rotates the spool by the second rotating body being rotated due to rotation force being transmitted to the second rotating body from the first rotating body;
a clutch that is provided between the first rotating body and the second rotating body in the transmission route, and that transmits rotation force of the first rotating body to the second rotating body in a specific state; and
a sub clutch that is different from the clutch that is provided between the first rotating body and the clutch in the transmission route and also between the first rotating body and the second rotating body in the transmission route, that transmits rotation force of the first rotating body to the clutch in a case in which the first rotating body is rotated toward another side, and that blocks transmission of the rotation force of the first rotating body to the clutch by the first rotating body rotating idly with respect to the sub clutch in a case in which the first rotating body is rotated toward one side opposite to the another side.

2. The webbing take-up device of claim 1 , wherein:
the sub clutch is configured by a sub clutch spring that includes a coil portion wound in a ring shape, a part of the sub clutch being caught at the clutch;
the rotation force of the first rotating body is transmitted to the clutch by the coil portion making pressing contact with the first rotating body in the case in which the first rotating body is rotated toward the another side; and
transmission of the rotation force of the first rotating body to the clutch is blocked by the first rotating body rotating idly with respect to the coil portion in the case in which the first rotating body is rotated toward the one side.

3. The webbing take-up device of claim 2 , wherein: the first rotating body is configured including a shaft portion that is rotatably supported by the clutch, and a gear portion that is integrally provided at the shaft portion; and at least a portion of the coil portion is disposed at a radial direction inner side of the gear portion.

4. The webbing take-up device of claim 3 , wherein the coil portion of the sub clutch is wound on the shaft portion in a direction such that:
diameter dimension of the coil portion decreases in the case in which the first rotating body is rotated toward the another side; and
the diameter dimension of the coil portion increases in the case in which the first rotating body is rotated toward the one side.

5. The webbing take-up device of claim 2 , wherein the coil portion of the sub clutch is wound in a direction such that:
diameter dimension of the coil portion decreases in the case in which the first rotating body is rotated toward the another side; and
the diameter dimension of the coil portion increases in the case in which the first rotating body is rotated toward the one side.

6. The webbing take-up device of claim 1 , wherein
the clutch is configured to include a rotor, a clutch member and a clutch gear,
the clutch member transmits rotation force from the rotor to the clutch gear in the specific state, and the clutch gear rotates the second rotating body by the clutch gear being rotated due to rotation force being transmitted to the clutch gear from the rotating body,
the sub clutch transmits rotation force of the first rotating body to the rotor in the case in which the first rotating body is rotated toward the another side, and that blocks transmission of the rotation force of the first rotating body to the rotor by the first rotating body rotating idly with respect to the sub clutch in the case in which the first rotating body is rotated toward the one side,
the sub clutch is a member which is different from the clutch member, and
the sub clutch is provided between the first rotating body and the clutch member in the transmission route.

7. The webbing take-up device of claim 6 , wherein
the sub clutch is provided between the first rotating body and the rotor in the transmission route,
the rotor is provided between the sub clutch and the clutch member in the transmission route, and
the clutch member is provided between the rotor and the clutch gear in the transmission route.

8. The webbing take-up device of claim 1 , wherein the clutch transmits rotation force of the first rotating body to the second rotating body in the specific state in which magnitude of rotation torque of the first rotating body toward another side is a specific value or greater.

Assignees

• Tokai Rika Co Ltd

Inventors

• Nagata Yuya
• Osaki Takahiro
• Saito Takuhiro
• Umakoshi Tomonari

Classifications

• B60R2022/468

  characterised by clutching means between actuator and belt reel · CPC title

• B60R2022/4666

  characterised by electric actuators · CPC title

• B60R22/44 Primary

  with means for reducing belt tension during use under normal conditions {(not included in the retractor B60R22/19; B60R22/3405 takes precedence)} · CPC title

• B60R22/34

  Belt retractors, e.g. reels (anchoring devices {, e.g. guide loops} , with means to tension the belt in an emergency B60R22/195) · CPC title

• B60R22/46 Primary

  {Reels} with means to tension the belt in an emergency {by forced winding up}(electrical circuits for triggering safety arrangements B60R21/01 {; tensioners using reels only guiding the belt during normal use, e.g. splitted reels B60R22/195}) · CPC title