Gas generator assembly with guide element

• US 10,640,077 B2
• Filed: 07/26/2016
• Issued: 05/05/2020
• Est. Priority Date: 08/06/2015
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Germany GmbH (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Joyson Safety Systems Germany GmbH (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Stellwagen, Michael, Behre, Rudiger, Bayer, Karl
• Primary Examiner(s): Condra, Darlene P
• Application Number:
  US15/749,722
• Publication Number:
  US 20180222436A1
• Time in Patent Office: 1,379 Days
• CPC Class Codes: B60R 2021/26011 using a filter through which the inflation gas passes
• CPC Class Codes: B60R 2021/26076 characterised by casing
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid
• CPC Class Codes: B60R 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence

Abstract

A gas generator assembly for an airbag module of a motor vehicle, including a generator housing with a first housing part and a second housing part, a combustion space formed in the generator housing for accommodating a pyrotechnic charge from which a gas for inflating a gas bag of the airbag module can be generated by combustion. At least one outlet opening is provided in the generator housing through which gas generated in the combustion space can be released for inflating the gas bag. At least one filter unit is arranged in the generator housing for filtering the gas generated from the pyrotechnic charge. The assembly includes a guide element arranged in the generator housing, by means of which the generated gas is guided to the at least one outflow opening. The guide element is of tubular form and has at least one deformation area.

Claims

1. A gas generator assembly for an airbag module of a motor vehicle, comprising

a generator housing with a first housing part and a second housing part,

a combustion space formed in the generator housing for accommodating a pyrotechnic charge from which a gas for inflating a gas bag of the airbag module can be generated by combustion,

at least one outlet opening of the generator housing, through which gas generated in the combustion space can be released for inflating the gas bag,

at least one filter unit arranged in the generator housing for filtering the gas generated from the pyrotechnic charge, and

a guide element arranged in the generator housing, by means of which the generated gas is guided to the at least one outlet opening,

wherein the guide element is of tubular form and has at least one deformation area by which the guide element bears against the second housing part of the gas generator assembly in order to block a flow path by which gas generated in the combustion space would get to the at least one outlet opening without passing the at least one filter unit, wherein the at least one deformation area has been produced after an insertion of the guide element into the generator housing, wherein the guide element includes a tear region in form of a pre-deformation and/or a material weakening, wherein the guide element is configured to deform at the tear region upon application of an external force to thereby produced the at least one deformation area;

and

wherein the at least one deformation area of the guide element bears against an inner surface of the generator housing adjacent to the outlet opening of the generator housing.

2. The gas generator assembly according to claim 1, wherein the at least one deformation area has been produced in an additional working step after the original forming of the guide element.

3. The gas generator assembly according to claim 1, wherein the at least one deformation area has been produced during the assembly of the generator housing.

4. The gas generator assembly according to claim 1, wherein the generator housing is of multipart design.

5. The gas generator assembly according to claim 3, wherein the generator housing is of multipart design and the at least one deformation area of the guide element has been produced by the fact that during the assembly of the generator housing the second housing part of the generator housing acts on the guide element.

6. The gas generator assembly according to claim 1, wherein due to the abutment at a component of the gas generator assembly the deformation area closes a possible flow path of gas generated in the combustion chamber along a wall of the generator housing to the outlet opening.

7. The gas generator assembly according to claim 1, wherein the guide element surrounds the combustion space.

8. The gas generator assembly according to claim 1, wherein the guide element is open at its two axial ends.

9. The gas generator assembly according to claim 1, wherein the guide element has a passage opening through which gas can exit from the combustion space in order to get to the at least one outlet opening of the generator housing.

10. The gas generator assembly according to claim 9, wherein the filter unit is arranged in the generator housing such that gas flowing from the combustion space through the passage opening of the guide element passes the filter unit before it gets to the at least one outlet opening of the generator housing.

12. The method according to claim 10, wherein the guide element is introduced into the first housing part to be arranged in the generator housing and that the at least one deformation area of the guide element is produced by the fact that during the assembly of the generator housing the second housing part of the generator housing acts on the guide element.

11. A method for manufacturing a gas generator assembly, comprising the steps of:

providing a generator housing with a first housing part and a second housing part,

forming a combustion space formed in the generator housing for accommodating a pyrotechnic charge from which a gas can be generated by combustion,

forming at least one outlet opening through which gas generated in the combustion space can be released for inflating a gas bag,

forming at least one filter unit arranged in the generator housing for filtering the gas generated from the pyrotechnic charge, and

arranging a guide element in the generator housing, by means of which gas generated in the combustion space can be guided to the at least one outflow opening, wherein the guide element is of tubular form, has at least one deformation area in form of a pre-deformation and/or a material weakening and is deformed at the deformation area after being arranged in the generator housing, so that the guide element bears against the second housing part of the gas generator assembly in order to block a possible flow path of gases generated in the combustion space to the at least one outlet opening, wherein the guide element deforms in the deformation area upon application of an external force, and wherein the at least one deformation area of the guide element bears against an inner surface of the generator housing adjacent to the at least one outlet opening of the generator housing.

13. The method according to claim 11, wherein the force applied for producing the deformation area acts on the guide element along a tube axis and the guide element thereby is deformed both along the tube axis and vertically thereto to form the deformation area.

14. A method for manufacturing a gas generator assembly, comprising the steps of:

providing a generator housing with a first housing part and a second housing part,

forming a combustion space formed in the generator housing for accommodating a pyrotechnic charge from which a gas can be generated by combustion,

forming at least one outlet opening through which gas generated in the combustion space can be released for inflating a gas bag,

arranging at least one filter unit in the generator housing for filtering the gas generated from the pyrotechnic charge, and

arranging a guide element in the generator housing, by means of which gas generated in the combustion space can be guided to the at least one outflow opening, wherein the guide element is of tubular form and includes a deformation area that is formed after the guide element is arranged in the generator housing, so that the guide element bears against the second housing part of the gas generator assembly in order to block a possible flow path of gases generated in the combustion space to the at least one outlet opening, and wherein the force applied for producing the deformation area acts on the guide element along a tube axis and the guide element thereby is deformed both along the tube axis and vertically thereto to form the deformation area, and wherein the deformation area of the guide element bears against an inner surface of the generator housing adjacent to the at least one outlet opening of the generator housing.