Trilevel performance gas generator

• US 5,033,390 A
• Filed: 11/13/1989
• Issued: 07/23/1991
• Est. Priority Date: 11/13/1989
• Status: Expired due to Term

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Hansen, Larry K., Minert, Roy T., Kirchoff, George F., Lauritzen, Donald R.
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US07/435,217
• Time in Patent Office: 617 Days
• Field of Search: 102/340, 102/342, 102/351, 102/357, 102/393, 102/489, 102/530, 102/531, 280/728, 280/736, 280/740, 280/741, 280/742, 422/164, 422/165, 422/166
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/2633 with a plurality of inflation levels
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26

Abstract

A gas generator which may be used for ejecting submunitions. The gas generator comprises a diffuser chamber which is flanked by differently sized combustion chambers whereby three different ejection velocities may be achieved by firing only one of the combustion chambers or by firing both of them together. The generated gas is exited from the gas generator at the same central location, i.e., the centrally located diffuser chamber, to control submunition yaw and loading locations. The provision of combustion chambers at opposite ends of the diffuser chamber permits minimization of gas generator diameter, and a tie member in the diffuser chamber permits a non-complicated and inexpensive structure which is rugged and reliable. The gas generator may have other applications such as for inflating airbags for automobiles.

Claims

1. A gas generator comprising an elongate diffuser chamber means having a pair of end portions, a pair of combustion chamber means which extend axially outwardly from said end portions respectively and each of which contains gas generant material, a pair of plate means each of which separates a respective one of said combustion chamber means from said diffuser chamber means, an elongated tie member having a pair of end portions which tie member is centrally disposed in said diffuser chamber means and which extends between and is attached to said plate means, a pair of elongated igniter means each of which has an end portion and each of which is centrally disposed in a respective one of said combustion chamber means and extending axially thereof for igniting said gas generant material in said respective combustion chamber means, means in each said plate means and said respective tie member end portion for supportively receiving said respective igniter means end portion, aperture means in each said plate means for routing gases from said respective combustion chamber means to said diffuser chamber means, and means for routing the gases from said diffuser chamber means.

2. A gas generator as claimed in claim 1 wherein said combustion chamber means are sized to have different volumes.

3. A gas generator as claimed in claim 1 wherein said diffuser chamber means has a wall thickness which is less than said combustion chamber means wall thickness.

4. A gas generator as claimed in claim 1 wherein said diffuser chamber means has a generally cylindrical wall and said tie member includes a centrally disposed radially enlarged portion which extends radially outwardly to engage said diffuser chamber means wall.

5. A gas generator as claimed in claim 4 wherein said tie member enlarged portion includes a plurality of passage means to permit gas flow from either of the combustion chamber means throughout said diffuser chamber means.

6. A gas generator as claimed in claim 5 wherein the gas generator includes two cylindrical members which define cylindrical walls respectively of the combustion chamber means and which extend beyond said respective combustion chamber means to be disposed in spaced end to end relation to together define the diffuser chamber wall, and said tie member enlarged portion engages said spaced cylindrical members and includes a radially outer portion which is disposed between said spaced cylindrical members.

7. A gas generator as claimed in claim 6 wherein said gas routing means comprises aperture means in said cylindrical members, the gas generator further comprises at least one generally cylindrical gas filter means in said diffuser chamber means which is disposed radially outwardly of said tie member enlarged portion passage means and said plate means aperture means and which is spaced radially from said cylindrical member aperture means to define a plenum chamber therebetween.

8. A gas generator as claimed in claim 7 further comprising a gas filter means disposed in at least one of said combustion chamber means adjacent said respective plate means.

9. A gas generator as claimed in claim 8 further comprising means for preventing gas flow from one of said combustion chamber means from passing from said diffuser chamber means into the other of said combustion chamber means to prevent gas generant material in an unfired combustion chamber means from being ignited.

10. A gas generator as claimed in claim 1 wherein said gas routing means comprises aperture means in cylindrical members which define said diffuser chamber, the gas generator further comprising at least one generally cylindrical gas filter means disposed in said diffuser chamber means and spaced from said cylindrical member aperture means to define a plenum chamber therebetween.

11. A gas generator as claimed in claim 10 further comprising a gas filter means disposed in at least one of said combustion chamber means adjacent said respective plate means.

12. A gas generator as claimed in claim 1 further comprising means for preventing gas flow from one of said combustion chamber means from passing from said diffuser chamber means into the other of said combustion chamber means to prevent gas generant material in an unfired combustion chamber means from being ignited.

13. A gas generator as claimed in claim 12 wherein said gas flow preventing means comprises a barrier member composed of insulating material disposed in said diffuser chamber means and attached to said respective plate means for said other of said combustion chamber means to sealingly cover said respective plate means aperture means for prevention of gas flow from the diffuser chamber means into said other of said combustion chamber means.