GAS GENERATOR FOR OCCUPANT RESTRAINING DEVICE FOR VEHICLE

• US 20070222195A1
• Filed: 03/21/2007
• Published: 09/27/2007
• Est. Priority Date: 03/22/2006
• Status: Active Grant

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: UEDA, Masayuki, YABUTA, Mikio
• Granted Patent: US 7,503,581 B2
• Time in Patent Office: Days
• US Class Current: 280/740
• 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

The present invention provides a gas generator for an occupant restraining device of a vehicle, comprising a substantially cup-like shaped diffuser shell having a plurality of gas discharge ports on a circumferential wall portion, a substantially cup-like shaped closure shell combined with the diffuser shell to form an outer container, a housing formed by the diffuser shell and closure shell, an ignition device, a gas generating agent ignited and combusted by activation of the ignition device to generate a combustion gas, and a substantially cylindrical filter for purifying and cooling the combustion gas generated from the gas generating agent, all accommodated in the housing, the housing formed by inserting part of an outer peripheral surface in the open portion side of the closure shell into part of the inner peripheral surface of the open portion side in the diffuser shell to abut against each other, so that they are integrated, the filter supported by abutting one end surface thereof against a ceiling surface of the diffuser shell and abutting the other end surface thereof against at least an annular end surface of the open portion of the closure shell, an annular space provided between the circumferential wall having the gas discharge ports of the diffuser shell and an outer circumferential surface of the filter.

Claims

1. A gas generator for a restraining device of a vehicle, comprising

a substantially cup-like shaped diffuser shell having a plurality of gas discharge ports on a circumferential wall portion,

a substantially cup-like shaped closure shell combined with the diffuser shell to form an outer container,

a housing formed by the diffuser shell and closure shell,

an ignition device, a gas generating agent ignited and combusted by activation of the ignition device to generate a combustion gas, and a substantially cylindrical filter for purifying and cooling the combustion gas generated from the gas generating agent, the ignition device, the gas generating agent, and the cylindrical filter being accommodated in the housing,

the housing formed by inserting part of an outer peripheral surface in the open portion side of the closure shell into part of the inner peripheral surface in the open portion side of the diffuser shell to abut against each other, so that they are integrated,

the filter supported by abutting one end surface thereof against a ceiling surface of the diffuser shell and abutting the other end surface thereof against at least an annular end surface of the open portion of the closure shell,

an annular space provided between the circumferential wall having the gas discharge ports of the diffuser shell and an outer circumferential surface of the filter.

2. The gas generator for an occupant restraining device for a vehicle according to claim 1, wherein

the filter is supported by abutting one end surface thereof against a ceiling surface of the diffuser shell and abutting the other end surface thereof against three surfaces including an inner peripheral surface of an open portion of the diffuser shell, an annular end surface of the open portion of the closure shell, and an inner peripheral surface of an open portion of the closure shell, and

an annular space is provided between a circumferential wall portion of the diffuser shell having gas discharge ports and an outer peripheral surface of the filter.

3. The gas generator for an occupant restraining device for a vehicle according to claim 1 or 2, wherein

the filter is vertically compressed by the ceiling surface of the diffuser shell and the annular end surface of the open portion of the closure shell.

4. A gas generator for an occupant restraining device of a vehicle, including

a substantially cup-like shaped diffuser shell having a plurality of gas discharge ports on a circumferential wall portion,

a substantially cup-like shaped closure shell combined with the diffuser shell to form an outer container,

a housing formed by a diffuser shell and closure shell,

an ignition device, a gas generating agent ignited and combusted by activation of the ignition device to generate a combustion gas, and a substantially cylindrical filter for purifying and cooling the combustion gas generated by the gas generating agent, the ignition device, the gas generating agent and the cylindrical filter being accommodated in the housing,

the housing formed by inserting part of an outer peripheral surface in the open portion side of the closure shell into part of the inner peripheral surface in the open portion side of the diffuser shell to abut against each other, so that they are integrated, an annular retainer disposed inside the housing and having at least one annular surface thereof supported by an annular end surface of the open portion of the closure shell,

the filter supported by abutting one end surface thereof against the ceiling surface of the diffuser shell and abutting the other surface against another annular surface of the annular retainer,

a annular space obtained between the circumferential wall having the gas discharge ports of the diffuser shell and an outer circumferential surface of the filter.

5. The gas generator for an occupant restraining device for a vehicle according to claim 4, wherein

the annular retainer has an outer annular surface and an inner annular surface formed by providing a step with respect to the outer annular surface, the outer annular surface is supported on the annular end surface of the open portion of the closure shell, and the other end surface of the filter is supported on at least the inner annular surface.

6. The gas generator for an occupant restraining device for a vehicle according to claim 4 or 5, wherein

the filter is vertically compressed by the ceiling surface of the diffuser shell and the annular retainer.

7. A gas generator for an occupant restraining device for a vehicle, comprising

a substantially cup-shaped diffuser shell having a plurality of gas discharge ports and an open portion,

a substantially cup-shaped closure shell having an open portion and combined with the diffuser shell to form an outer container, a housing formed by inserting an inner peripheral surface of the open portion of the diffuser shell into the outer peripheral surface of the open portion of the closure shell to abut against each other,

an ignition device, a gas generating agent combusted by activation of the ignition device to generate combustion gas, a substantially cylindrical filter for purifying and cooling the combustion gas, and a retainer supporting a lower end surface of the filter, the ignition device, the gas generating agent, and the cylindrical filter being accommodated in the housing,

the retainer comprising a first disk portion abutting against the closure shell, an annular portion extending from the first disk portion and abutting against the lower peripheral wall surface of the filter and a second disk portion extending from the annular portion and abutting against the lower end surface of the filter,

the filter supported by abutting an upper end surface thereof against the ceiling surface of the diffuser shell and abutting the lower end surface against the second disk portion, and the lower end surface thereof positioned with a distance from a bottom plate of the closure shell,

an annular space provided between the circumferential wall portion of the housing and outer peripheral surface of the filter.

8. The gas generator for an occupant restraining device according to claim 7, wherein the second disk plate portion disposed between the lower end surface of the filter and bottom plate of the closure shell, having a distance from the bottom plate of the closure shell, and the filter is compressed vertically only by the ceiling surface of the diffuser shell and the retainer.

9. The gas generator for an occupant restraining device according to claim 8, wherein the upper end surface of the filter abuts against the annular slope formed in the ceiling surface of the diffuser shell.

10. The gas generator for an occupant restraining device according to any one of claims 7 to 9, wherein the holding retainer for preventing short-pass of combustion gas is disposed to abut against the ceiling surface of the diffuser shell and the inner peripheral surface of the upper end portion of the filter.