Gas generating system

• US 7,814,838 B2
• Filed: 06/27/2005
• Issued: 10/19/2010
• Est. Priority Date: 06/28/2004
• Status: Expired due to Fees

• Current Assignee: Joyson Safety Systems Acquisition, LLC (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: McCormick, David M.
• Primary Examiner(s): Chambers; Troy
• Application Number:
  US11/167,849
• Publication Number:
  US 20060005734A1
• Time in Patent Office: 1,940 Days
• Field of Search: 280736-7432, 102/530
• 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: C06D 5/06 by reaction of two or more solids

Abstract

A gas generating system (10) including a baffle system (42) for modifying the temperature and pressure of a gas generated by the system, and to remove particulates from the gas. The gas generating system includes a first combustion chamber (34a), a second combustion chamber (36a), and the baffle system (42) adjacent both the first and second combustion chambers so as to enable fluid communication with the combustion chambers upon activation of the gas generating system. In another aspect of the present invention, a baffle system (42) is provided including a first end plate (44) having an opening (44b) formed therein for enabling fluid communication with a first fluid source (34a), a second end plate (46) having an opening (46b) formed therein for enabling fluid communication with a second fluid source (36a), and a sequence of baffle elements (48) extending between the first and second end plates. A first baffle element (48a) of the sequence of baffle elements defines a chamber (60) for receiving therein a fluid through the openings in the first and second end plates. Each additional baffle element in the sequence of baffle elements is spaced outwardly apart from a preceding baffle element in the sequence of baffle elements. In another aspect of the invention, a method is provided for producing, in a gas generating system, a gas having a pressure within a predetermined pressure range and a temperature within a predetermined temperature range. In another aspect of the present invention, a vehicle occupant protection system is provided.

Claims

1. A gas generating system comprising:

a first combustion chamber containing a first quantity of gas generant material;

a second combustion chamber containing a second quantity of gas generant material; and

a baffle system positioned adjacent both the first and second combustion chambers so as to enable fluid communication with the first combustion chamber and the second combustion chamber upon activation of the gas generating system,

the gas generating system being configured such that combustion of one of the first quantity of gas generant material and the second quantity of gas generant material may be initiated without initiating combustion of the other one of the first quantity of gas generant material and a second quantity of gas generant material.

2. The gas generating system of claim 1 wherein the baffle system is adapted for providing a tortuous flow path for a fluid flowing through the baffle system.

3. The gas generating system of claim 1 wherein the first combustion chamber is positioned on an opposite side of the baffle system from the second combustion chamber.

4. The gas generating system of claim 1 further comprising a smokeless gas generant composition positioned in at least one of the first combustion chamber and the second combustion chamber.

5. A vehicle occupant protection system comprising an airbag system including an airbag and a gas generating system in accordance with claim 1 operatively coupled to the airbag so as to enable fluid communication with the airbag upon activation of the airbag system.

6. A gas generating system comprising:

a housing having an outer wall and at least one opening formed therein to enable fluid communication between an interior of the housing and an exterior of the housing

a first combustion chamber;

a second combustion chamber; and

a baffle system positioned adjacent both the first and second combustion chambers so as to enable fluid communication with the first combustion chamber and the second combustion chamber upon activation of the gas generating system,

the baffle system including a baffle plate defining a chamber adapted for receiving therein at least one of a fluid from the first combustion chamber and a fluid from the second combustion chamber upon activation of the gas generating system, the baffle plate having at least one opening therealong for enabling fluid communication between the chamber and an exterior of the chamber,

wherein the at least one housing wall opening is spaced apart from the at least one baffle plate opening so as to provide a tortuous path for flow of a fluid between the at least one baffle plate opening and the at least one housing wall opening.

7. The gas generating system of claim 6 wherein the baffle system further comprises at least a second baffle plate and a third baffle plate, the second baffle plate being positioned exterior of the baffle plate so as to define a first fluid flow passage extending between the second baffle plate and the baffle plate, the third baffle plate being positioned exterior of the second baffle plate so as to define a second fluid flow passage extending between the second baffle plate and the third baffle plate, the second baffle plate having at least one opening therealong fat enabling fluid communication between the first fluid flow passage and the second fluid flow passage, the third baffle plate having at least one opening therealong for enabling fluid communication between, the second fluid flow passage and the housing wall.

8. The gas generating system of claim 7, wherein the opening in the housing is spaced apart from the at least one opening in the third baffle plate, the at least one opening in the third baffle plate is spaced apart from the at least one opening in the second baffle plate, and the at least one opening in the second baffle plate is spaced apart from the at least one opening in the baffle plate, so as to provide a tortuous path for flow of a fluid between the first combustion chamber and the at least one opening in the housing wall and between the first combustion chamber and the at least one opening in the housing wall.

9. The gas generating system of claim 7 wherein the baffle plates are generally cylindrical.

10. The gas generating system of claim 9 wherein the at least two of the baffle plates are positioned coaxially within the housing.

11. A gas generating system comprising:

a housing having an outer wall;

a first combustion chamber;

a second combustion clamber; and

a baffle system positioned adjacent both the first and second combustion chambers so as to enable fluid communication with the first combustion chamber and the second combustion chamber upon activation of the gas generating system; and

a fluid flow passage positioned interior of the housing wall and extending along at least a portion of at least one of the first combustion chamber and the second combustion chamber, the fluid flow passage being in fluid communication with the baffle system, the housing wall having at least one opening formed therein along the fluid flow passage for enabling fluid communication between the fluid flow passage and an exterior of the housing,

so as to provide a fluid flow path from an of the first combustion chamber and the second combustion chamber through the baffle system and to the at least one housing wall opening upon activation of the gas generating system.