Vehicle seat reclining device

Patent metadata

Field	Value
Publication number	US-11241981-B2
Application number	US-202117315736-A
Country	US
Kind code	B2
Filing date	May 10, 2021
Priority date	May 13, 2020
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A vehicle seat reclining device includes: a ratchet and a guide assembled to be rotatable relative to each other; a plurality of pawls respectively supported by a plurality of corresponding pairs of guide walls of the guide and configured to mesh with the ratchet; and a cam configured to press the pawls in a radial direction by a biasing force of a lock spring. The guide has: welding dowels configured to be welded to a seat frame, the respective welding dowels being formed between the respective pairs of guide walls; and a hooking hole formed between a specific pair of guide walls, an end portion of the lock spring being hooked in the hooking hole. In a state before the welding dowels are welded to the seat frame, a width between the specific pair of guide walls is larger than a width between another pair of guide walls.

First claim

What is claimed is:

1. A vehicle seat reclining device comprising:
a ratchet and a guide assembled in an axial direction to be rotatable relative to each other, the guide including a plurality of pairs of guide walls;
a plurality of pawls respectively supported by the plurality of corresponding pairs of guide walls from both sides in a rotation direction, the plurality of pawls being configured to mesh with the ratchet by being pressed outward in a radial direction to lock a relative rotation between the ratchet and the guide;
a lock spring; and
a cam configured to press the plurality of pawls from an inner side to an outer side in the radial direction by a biasing force of the lock spring,
wherein the guide has:
welding dowels protruding outward in the axial direction and being configured to be welded to a seat frame, the respective welding dowels being formed between the respective pairs of guide walls, and
a hooking hole formed between a specific pair of guide walls included in the plurality of pairs of guide walls, an end portion of the lock spring being hooked in the hooking hole, and

wherein, in a state before the welding dowels are welded to the seat frame, a width between the specific pair of guide walls where the hooking hole is formed is larger than a width between another pair of guide walls included in the plurality of pairs of guide walls.

2. The vehicle seat reclining device according to claim 1 , wherein welding lengths of the welding dowels to be welded are each substantially the same.

Assignees

• Toyota Boshoku Kk

Inventors

• Teraguchi Hiroaki

Classifications

• B60N2/224

  Stepwise movement mechanisms, e.g. ratchets · CPC title

• B60N2/236 Primary

  linearly movable · CPC title

• B60N2/2362 Primary

  rotatably movable · CPC title