INFLATABLE SEAT BELT INCLUDING A THORAX AIRBAG

• US 20090066063A1
• Filed: 09/11/2007
• Published: 03/12/2009
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Mical, Robert A.
• Granted Patent: US 7,883,106 B2
• Time in Patent Office: Days
• US Class Current: 280/733
• CPC Class Codes: B60R 21/18 the inflatable member formed as a belt or harness or combined with a belt or harness arrangement

Abstract

A seat belt assembly for use in a seat belt system of a motor vehicle to restrain a vehicle occupant. The assembly includes a belt webbing extending from a first end to a second end and includes tubular webbing extending from the first end and configured to open at a tear seam. An airbag is disposed within the tubular webbing and configured to inflate and deploy through the tear seam. A gas generator is fluidly coupled to the airbag and configured to provide an expanding gas to inflate and deploy the airbag in response to a control signal. A first part of the airbag is configured to inflate above the tubular webbing such that the first part of the airbag is disposed between a side or door of the vehicle and the thorax of the vehicle occupant.

Claims

1. A seat belt assembly to restrain an occupant of a motor vehicle having a side or door, the assembly comprising:

a belt webbing extending from a first end to a second end and including a lap portion adjacent the first end and a shoulder portion between the lap portion and the second end, the lap portion including tubular webbing extending from the first end to a transition point and being configured to open at a tear seam, and a solid section extending from the transition point to the second end;

an airbag being disposed within the tubular webbing and configured to inflate and deploy through the tear seam;

at least one gas generator being fluidly coupled to the airbag and configured to provide an expanding gas to inflate and deploy the airbag in response to a control signal; and

at least a first part of the airbag being configured to inflate and deploy above the tubular webbing such that the first part of the airbag is disposed between the occupant and the side or door of the vehicle to provide thorax protection.

2. The assembly of claim 1 wherein the airbag further includes a second part being configured to inflate and deploy from the tubular webbing along a longitudinal length of the tubular webbing to provide pelvis protection to the occupant.

3. The assembly of claim 1 wherein the first end is attached to an anchor.

4. The assembly of claim 3 wherein the gas generator is attached to the anchor.

5. The assembly of claim 4 wherein the anchor further includes a tubular gas guide having at least one aperture and an inner guide wall defining an internal passage.

6. The assembly of claim 5 wherein the gas generator is disposed within the passage of the tubular gas guide and arranged to provide a substantially straight flow path for the expanding gas to enter the airbag.

7. The assembly of claim 6 wherein an inner diameter of the aperture is smaller than an outer diameter of a retaining ring attached to the first end of the tubular webbing.

8. The assembly of claim 7 wherein the belt webbing is attached to the anchor by axially disposing the tubular webbing through the aperture such that the retaining ring is restrained by the smaller inner diameter of the aperture.

9. The assembly of claim 8 wherein the gas generator is fluidly coupled to the airbag by means of a portion of the airbag being disposed through the retaining ring and into the internal passage of the tubular gas guide.

10. The assembly of claim 7 wherein the retaining ring is attached to the first end of the tubular webbing by sewing the ring to the webbing.

11. The assembly of claim 7 wherein the retaining ring is attached to the first end of the tubular webbing by weaving it into the webbing.

12. The assembly of claim 1 wherein belt webbing is woven as a unitary piece that transitions from the tubular webbing to the solid section at the transition point.

13. The assembly of claim 1 wherein a distance from the first end to the transition point is constant.

14. The assembly of claim 1 wherein a web stop button is disposed on the solid section proximal to the transition point.

15. The assembly of claim 1 wherein the second end is attached to a retractor

16. An inflatable seat belt system to restrain an occupant of a motor vehicle having a side or door, the system comprising:

a belt webbing extending from a first end to a second end and including a lap portion adjacent the first end and a shoulder portion between the lap portion and the second end, the first end being attached to an anchor and the second end being attached to a retractor;

a latch plate being disposed on the belt webbing and configured for engagement with a buckle, the anchor and retractor and buckle being arranged such that when the latch plate is engaged with the buckle the lap portion is disposed across a pelvis of the occupant and the shoulder portion is disposed across a shoulder and thorax of the occupant;

the lap portion including tubular webbing extending from the first end to a transition point and being configured to open at a tear seam, and a solid section extending from the transition point to the second end, an airbag disposed within the tubular webbing is configured to inflate and deploy through the tear seam, and a distance from the anchor to the transition point remains constant to ensure proper positioning of the airbag;

a gas generator attached to the anchor being fluidly coupled to the airbag and configured to provide an expanding gas to inflate and deploy the airbag in response to a control signal; and

a first part of the airbag being configured to inflate and deploy above the tubular webbing such that the first part of the airbag is disposed between the occupant and the side or door of the vehicle to provide thorax protection to the occupant.

17. The seat belt system of claim 16 wherein the airbag further includes a second part being configured to inflate and deploy from the tubular webbing along a longitudinal length of the tubular webbing adjacent the pelvis of the occupant.

18. The seat belt system of claim 16 wherein the anchor further includes a tubular gas guide having at least one aperture and an inner guide wall defining an internal passage.

19. The seat belt system of claim 18 wherein the gas generator is disposed within the passage of the tubular gas guide and arranged to provide a substantially straight flow path for the expanding gas to enter the airbag.

20. The seat belt system of claim 18 wherein an inner diameter of the aperture is smaller than an outer diameter of a retaining ring attached to the first end of the tubular webbing.

21. The seat belt system of claim 20 wherein the belt webbing is attached to the anchor by axially disposing the tubular webbing through the aperture such that the retaining ring is restrained by the smaller inner diameter of the aperture.

22. The seat belt system of claim 16 wherein the anchor, retractor and buckle are attached to an interior of the motor vehicle or a frame of a seat of the motor vehicle.

23. The seat belt system of claim 22 wherein the solid section of the shoulder potion is guided through a D-ring into the retractor.

24. The seat belt system of claim 16 wherein the latch plate is slidably disposed along the belt webbing.

25. The seat belt system of claim 16 wherein a web stop button is disposed on the solid section proximal to the transition point and is configured to prevent the latch plate from contacting the tubular webbing.