Vehicular seat equipped with cushion airbag device, and cushion airbag

Patent metadata

Field	Value
Publication number	US-10427565-B2
Application number	US-201815957162-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	May 8, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A vehicular seat includes: a cushion panel disposed to extend in a seat front-rear direction and to form a bottom portion of a seat cushion; an inflator configured to operate to produce gas, the inflator being provided in the seat cushion; and a cushion airbag configured to expand due to the gas and to push up a range including portions of a seat occupant from thighs to hip points in an expansion end state, the cushion airbag being provided over the cushion panel, in which the cushion airbag is set such that a push-up force in rear right and left regions corresponding to right and left hip joints to right and left lower ischium portions of the seat occupant in the expansion end state is lower than a push-up force in a rear center region present between the rear right and left regions in the expansion end state.

First claim

What is claimed is:

1. A vehicular seat comprising:
a cushion panel disposed to extend in a seat front-rear direction and to form a bottom portion of a seat cushion;
an inflator configured to operate to produce gas, the inflator being provided in the seat cushion; and
a cushion airbag configured to expand due to the gas supplied from the inflator and to push up a range including portions of a seat occupant from thighs to hip points in an expansion end state, the cushion airbag being provided over the cushion panel,
wherein the cushion airbag is set such that a push-up force in rear right and left regions corresponding to right and left hip joints to right and left lower ischium portions of the seat occupant in the expansion end state is lower than a push-up force in a rear center region present between the rear right and left regions in the expansion end state.

2. The vehicular seat according to claim 1 , wherein:
the cushion airbag includes
a front portion that includes portions corresponding to the thighs of the seat occupant,
a pair of right and left rear side portions that is set in a range from hip joint corresponding portions that are portions corresponding to the hip joints of the seat occupant to lower ischium edge corresponding portions that are portions corresponding to lower ischium edges of the seat occupant, and
a rear center portion that is disposed between the right and left rear side portions; and

the cushion airbag is set such that, during the expansion of the cushion airbag in an occupant seated state, upper surfaces of the hip joint corresponding portions of the rear side portions are positioned with a step difference below, in a seat height direction, a center portion of an upper surface of the rear center portion in a seat width direction.

3. The vehicular seat according to claim 2 , wherein an expansion thickness of the rear side portions in a seat up-down direction during the expansion of the cushion airbag is set to be less than an expansion thickness of the rear center portion in the seat up-down direction during the expansion of the cushion airbag.

4. The vehicular seat according to claim 3 , wherein sewn portions or tethers are provided in right and left side portions of a rear portion of the cushion airbag, the sewn portions or the tethers connecting overlapping portions of the right and left side portions in the seat up-down direction to each other to restrict an expansion thickness of the rear side portions in the seat up-down direction during the expansion of the cushion airbag.

5. The vehicular seat according to claim 2 , wherein:
the cushion panel includes
a panel rear center portion that is a portion corresponding to the rear center portion, and
panel rear side portions that are disposed outside of the panel rear center portion in the seat width direction; and

the panel rear side portions are positioned below, in the seat height direction, a center portion of the panel rear center portion in the seat width direction.

6. The vehicular seat according to claim 2 , wherein:
the cushion panel includes
a panel rear center portion that is a portion corresponding to the rear center portion, and
panel rear side portions that are disposed outside of the panel rear center portion in the seat width direction; and

the panel rear side portions are set such that, in a case where the cushion airbag expands in the occupant seated state, the panel rear side portions receive an expansion pressure of the cushion airbag to move down below, in the seat height direction, the center portion of the panel rear center portion in the seat width direction.

7. The vehicular seat according to claim 1 , wherein:
the inflator is disposed toward a seat front side in the cushion airbag;
the cushion airbag is formed by sewing a base cloth folded at the center such that portions of the base cloth overlap each other in an up-down direction;
a folded portion of the base cloth is disposed along a seat width direction to form a seat rear side end portion of the cushion airbag; and
a stitched portion of the cushion airbag includes
a pair of side stitched portions that is provided on opposite sides in the seat width direction and extends in the seat front-rear direction, and
a pair of rear stitched portions that extends toward an inner oblique rear side in the seat width direction from respective rear ends of the side stitched portions to a center portion of the folded portion in the seat width direction and has rear ends distant from each other.

8. A cushion airbag in which an inflator is accommodated in a seat front side in a state where the cushion airbag is mounted on a vehicular seat, and a push-up force in rear right and left regions corresponding to right and left hip joints to right and left lower ischium portions of a seat occupant of the vehicular seat in an expansion end state of the cushion airbag is set to be lower than a push-up force in a rear center region present between the rear right and left regions in the expansion end state, wherein:
the cushion airbag is formed by sewing a base cloth folded at the center such that portions of the base cloth overlap each other in an up-down direction;
a portion where the inflator is disposed is provided at a portion opposite to a folded portion side of the base cloth in the cushion airbag; and
a stitched portion of the cushion airbag includes
a pair of side stitched portions that is provided on opposite sides in a first direction along an extending direction of the folded portion and extends along a second direction perpendicular to the first direction, and
a pair of rear stitched portions that extends obliquely from respective folded portion side end portions of the side stitched portions to a center portion of the folded portion in the first direction to move close to each other and has end portions positioned in the folded portion and distant from each other.

9. A vehicular seat comprising:
a cushion panel disposed to extend in a seat front-rear direction and to form a portion of a seat cushion;
an inflator configured to operate to produce gas, the inflator being connected to an inside of the seat cushion; and
a cushion airbag configured to expand due to the gas supplied from the inflator and to push up a range of the cushion panel including portions of a seat occupant from thighs to hip points at least in an expansion end state, the cushion airbag being provided over the cushion panel,
wherein the cushion airbag is set such that a first force at which the cushion airbag pushes up the cushion panel in rear right and left regions corresponding to right and left hip joints to right and left lower ischium portions of the seat occupant in the expansion end state is lower than a second force at which the cushion airbag pushes up the cushion panel in a rear center region present between the rear right and left regions in the expansion end state.

10. A cushion airbag in which an inflator is accommodated in a seat front side in a state where the cushion airbag is mounted on a vehicular seat, and a first force at which the cushion airbag pushes up rear right and left regions corresponding to right and left hip joints to right and left lower ischium portions of a seat occupant of the vehicular seat in an expansion end state of the cushion airbag is set to be lower than a second force at which the cushion airbag pushes up a rear center region present between the rear right and left regions in the expansion end state, the cushion airbag comprising:
a base cloth folded at the center such that portions of the base cloth overlap each other in an up-down direction;
a stitched portion obtained by sewing the base cloth; and
a portion where t

Assignees

• Toyota Motor Co Ltd
• Toyoda Gosei Kk

Inventors

• Sasaki Akihito
• Matsuba Ikufumi
• Maeno Tomoyuki
• Ohno Mitsuyoshi
• Tanaka Yoshikazu
• Ota Shohei

Classifications

• B60N2/42745

  of the back-rest (B60N2/433 takes precedence; higher part of the back-rest moving together with the headrest B60N2/888) · CPC title

• B60R21/20

  Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components · CPC title

• B60N2/42754 Primary

  of the cushion · CPC title

• B60R21/207

  in vehicle seats · CPC title

• B60N2/42763

  with anti-submarining systems · CPC title