Seat reclining device

Patent metadata

Field	Value
Publication number	US-9908443-B2
Application number	US-201515120353-A
Country	US
Kind code	B2
Filing date	Feb 20, 2015
Priority date	Feb 24, 2014
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A seat reclining device includes a first bracket, a second bracket, a cam, and pawls moved in a radial direction and engaged with the second bracket. The pawls include outer teeth engageable with the second bracket. The second bracket includes an outer circumferential wall including inner teeth engaged with the outer teeth, and an inner circumferential portion. At least one of the pawls includes a first block and a second block shifted in an axial direction from the first block. The second block is formed integrally with the first block. The first block includes the outer teeth and a cam surface that contacts the cam. The second block includes a restriction surface that contacts the inner circumferential portion when the pawl moves toward the outer side. The cam surface and the restriction surface have the same planar structure.

First claim

The invention claimed is:

1. A seat reclining device comprising:
a first bracket;
a second bracket that is rotatable relative to the first bracket;
a cam that is rotatable relative to the first bracket; and
pawls moved in a radial direction of the first bracket and engaged with the second bracket by rotation of the cam, wherein
the pawls include outer teeth that are engageable with the second bracket,
the second bracket includes an outer circumferential wall, which includes inner teeth that are engaged with the outer teeth of the pawls, and an inner circumferential portion, which extends in a circumferential direction and is located toward an inner side in a radial direction from the outer circumferential wall,
at least one of the pawls includes a first block that is arranged toward an outer side in the radial direction and a second block that is arranged toward an inner side in the radial direction and located at a position shifted in an axial direction of the cam from the first block, wherein the second block is formed integrally with the first block,
the first block has a radially outer end surface including the outer teeth,
the first block has a radially inner end surface including a cam surface that contacts the cam,
the second block has a radially outer end surface including a restriction surface that contacts the inner circumferential portion when the pawl moves toward the outer side in the radial direction, and
the cam surface and the restriction surface have the same planar structure.

2. The seat reclining device according to claim 1 , wherein
the cam surface includes a first region, a second region, and a third region that are sequentially arranged in the circumferential direction, wherein the first region and the third region are configured as regions that contact the cam; and
the restriction surface includes a fourth region that corresponds to the first region, a fifth region that corresponds to the second region, and a sixth region that corresponds to the third region, wherein the fifth region is configured as a region that contacts the inner circumferential portion when the pawl moves toward the outer side in the radial direction.

3. The seat reclining device according to claim 2 , wherein the fifth region is formed to be shaped in conformance with an inner circumferential surface of the inner circumferential portion of the second bracket.

4. The seat reclining device according to claim 1 , wherein the cam surface at the radially inner end surface of the first block and the restriction surface at the radially outer end surface of the second block are identical in shape with each other, and the cam surface and the restriction surface are located at the same position in the radial direction.

5. The seat reclining device according to claim 1 , wherein the at least one of the pawls including the first block and the second block is formed through stamping.

6. A seat reclining device comprising:
a first bracket;
a second bracket that is rotatable relative to the first bracket;
a cam that is rotatable relative to the first bracket; and
pawls moved in a radial direction of the first bracket and engaged with the second bracket by rotation of the cam, wherein
the pawls include outer teeth that are engageable with the second bracket,
the second bracket includes an outer circumferential wall, which includes inner teeth that are engaged with the outer teeth of the pawls, and an inner circumferential portion, which extends in a circumferential direction and is located toward an inner side in a radial direction from the outer circumferential wall,
at least one of the pawls includes a first block that is arranged toward an outer side in the radial direction and a second block that is arranged toward an inner side in the radial direction, wherein the first block has a radially outer end that includes the outer teeth,
the first block has a radially inner end surface including a cam surface that contacts the cam,
the second block has a radially outer end including a restriction surface that contacts the inner circumferential portion when the pawl moves toward the outer side in the radial direction, and
the cam surface and the restriction surface have the same planar structure,
regions located at two opposite circumferential sides of a circumferentially middle region of the cam surface each have a cam function,
the circumferentially middle region of the cam surface is without a cam function, and
the restriction surface includes a region corresponding to the circumferential middle region of the cam surface and configured as a portion that contacts the inner circumferential portion.

Assignees

• Aisin Seiki

Inventors

• Nagura Mikihito
• Abaka Atsushi

Classifications

• B60N2/235 Primary

  by gear-pawl type mechanisms · CPC title

• B60N2/2356 Primary

  with internal pawls · CPC title

• B60N2/12

  slidable and tiltable · CPC title

• B60N2/236

  linearly movable · CPC title