Diffuser

• US 9,061,652 B2
• Filed: 04/23/2012
• Issued: 06/23/2015
• Est. Priority Date: 05/02/2011
• Status: Active Grant

• Current Assignee: TRW Automotive GmbH (Apollo Global Management, Inc.)
• Original Assignee: TRW Automotive GmbH (Apollo Global Management, Inc.)
• Inventors: Acker, Dominique, Zischka, Gerd, Bogdanovic, Stojan, Loos, Andreas, Scherr, Jurgen
• Primary Examiner(s): Dickson, Paul N
• Assistant Examiner(s): Freedman, Laura
• Application Number:
  US14/112,614
• Publication Number:
  US 20140062072A1
• Time in Patent Office: 1,156 Days
• Field of Search: 280/736, 280/740, 280/742
• US Class Current: 1/1
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid

Abstract

In a diffusor (14) for an inflator (10) of an airbag module including an outer wall (16) that encloses the inflator (10) at least in a discharge area (12) in the circumferential direction, wherein the outer wall (16) has a gap edge (18) extending substantially in the longitudinal direction (L) and is bent open along said gap edge (18) upon activation of the inflator (10) and a discharge direction for the gas is defined, it is provided that gas deflecting elements (24, 26) which influence the discharge direction of the gas discharged from the inflator (10) in the bent-open state of the diffusor (14) are provided at the outer wall (16).

Claims

1. A diffusor (14) for an inflator (10) of an airbag module including an outer wall (16) enclosing the inflator (10) at least in a discharge area (12) in a circumferential direction (U), wherein the outer wall (16) has gap edges (18) substantially extending in a longitudinal direction (L) along an entire length of the outer wall (16) and is bent open along said gap edges (18) upon activation of the inflator (10) and defines a discharge direction for gas, the gap edges (18) having a substantially constant circumferential spacing from one another along the entire length of the diffusor (14),

wherein gas deflecting elements (24, 26) are provided at the outer wall (16) for influencing the discharge direction of the gas discharged from the inflator (10) in the bent-open state of the diffusor (14),

and wherein the gas deflecting elements (24, 26) are projections (24) and/or recesses provided on an inside of the outer wall (16).

2. The diffusor according to claim 1, wherein the projections (24) and/or the recesses are point-shaped.

3. The diffusor according to claim 1, wherein the projections (24) and/or the recesses are line-shaped and extend in an axial direction with respect to the longitudinal direction of the diffusor (14).

4. The diffusor according to claim 3, wherein the projections (24) and/or the recesses form a wave profile viewed in an axial cross-section.

5. The diffusor according to claim 1, wherein the projections (24) and/or the recesses are formed by embossing the outer wall (16).

6. The diffusor according to claim 1, wherein the gap edges (18) have a waveform viewed in an axial direction.

7. The diffusor according to claim 1, wherein the recesses comprise oblong slits (26) extending in an axial direction and provided at the outer wall (16) such that the oblong slits (26) extend radially through the entire outer wall (16).

8. The diffusor according to claim 1, wherein the outer wall (16) has a substantially cylindrical shape and is substantially dished in the bent-open state.

9. The diffusor according to claim 1, wherein the outer wall (16) has a substantially C-shaped axial cross-section prior to activation of the inflator (10).

10. The diffusor according to claim 1, wherein the outer wall (16) has the same length in the longitudinal direction (L) prior to and upon activation of the inflator (10).

11. The diffusor according to claim 1, wherein the outer wall (16) is substantially U-shaped in the bent-open state.

12. A diffusor (14) for an inflator (10) of an airbag module including an outer wall (16) enclosing the inflator (10) at least in a discharge area (12) in a circumferential direction (U), wherein the outer wall (16) has a single gap edge (18) substantially extending in a longitudinal direction (L) along an entire length of the outer wall (16) and is bent open along said gap edge (18) upon activation of the inflator (10) and defines a discharge direction for gas, the outer wall (16) being bent radially inwardly at the gap edge (18),

wherein gas deflecting elements (24, 26) are provided at the outer wall (16) for influencing the discharge direction of the gas discharged from the inflator (10) in the bent-open state of the diffusor (14),

and wherein the gas deflecting elements (24, 26) are projections (24) and/or recesses provided on an inside of the outer wall (16).

13. A diffusor (14) for an inflator (10) of an airbag module including an outer wall (16) enclosing the inflator (10) at least in a discharge area (12) in a circumferential direction (U), wherein the outer wall (16) has a single gap edge (18) substantially extending in a longitudinal direction (L) along an entire length of the outer wall (16) and is bent open along said gap edge (18) upon activation of the inflator (10) and defines a discharge direction for gas,

wherein gas deflecting elements (24, 26) are provided at the outer wall (16) for influencing the discharge direction of the gas discharged from the inflator (10) in the bent-open state of the diffusor (14),

wherein the gas deflecting elements (24, 26) comprise inwardly protruding circular projections (24) provided on an inside of the outer wall (16) that are free from openings.

14. A diffusor for an inflator of an airbag module comprising:

an outer wall enclosing the inflator at least in a discharge area, the outer wall extending continuously about an axis from a first edge extending in a longitudinal direction of the inflator to a second edge extending parallel to the first edge and extending in the longitudinal direction, both the first edge and the second edge extending an entire length of the diffusor, the outer wall being bent open along the first and second edges upon activation of the inflator to define a discharge direction for gas,

wherein gas deflecting elements are provided at the outer wall for influencing the discharge direction of the gas discharged from the inflator in the bent-open state of the diffusor, the gas deflecting elements being projections and/or recesses provided on an inside of the outer wall.