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A gas generator comprises an oblong outer housing and an elongated combustion chamber insert with a tubular wall arranged in the outer housing. The combustion chamber insert contains a solid propellant, has a first and a second axial end and is held in the outer housing. The tubular wall of the comb

A gas generator comprises an oblong outer housing and an elongated combustion chamber insert with a tubular wall arranged in the outer housing. The combustion chamber insert contains a solid propellant, has a first and a second axial end and is held in the outer housing. The tubular wall of the combustion chamber insert is fixed at both axial ends by a form fit in radial and axial direction to the outer housing.

대표청구항 ▼

The invention claimed is: 1. A gas generator, comprising: an oblong outer housing (12) having an inner wall forming a tapered section, and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424

The invention claimed is: 1. A gas generator, comprising: an oblong outer housing (12) having an inner wall forming a tapered section, and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424; 524) containing a solid propellant (26), having a first and a second axial end (28, 29; 29') and being held in said outer housing, and at least one of the first and second axial ends having a tapered section, the geometric shape of the tapered section of the housing and of the tapered section of the combustion chamber insert being adapted to each other so that in the tapered section of the outer housing (12) the tapered section of the tubular wall of said combustion chamber insert (24; 24'; 430; 530) lies against the inner housing wall with a form fit and is fixed at both axial ends (28, 29; 29') in radial and axial directions to said outer housing (12), while the tubular wall is spaced from the outer housing (12) between the axial ends (28, 29, 29') and the combustion chamber insert is prestressed in the axial direction. 2. The gas generator according to claim 1, wherein said wall of said combustion chamber insert (24; 24'; 424; 524) is formed partially by a cap-shaped, axial end piece (30; 430; 530). 3. The gas generator according to claim 2, wherein said cap-shaped end piece (30; 430; 530) has a cylindrical peripheral edge with through-flow openings (32). 4. The gas generator according to claim 2, wherein said cap-shaped end piece (30; 430) has an axial dividing wall (39; 439) to delimit a combustion chamber (25) formed in said combustion chamber insert (24; 24'). 5. The gas generator according to claim 1, wherein said first axial end (28) of said combustion chamber insert (24; 24'; 424; 524) tapers at least partially, a receptacle (46) coordinated with a geometric shape of said first axial end (28) is provided in said outer housing, and said first axial end (28) is held and fixed with said form fit in said receptacle (46). 6. The gas generator according to claim 1, wherein said second axial end (29) of said combustion chamber insert (24) is open and lies prestressed against said outer housing (12). 7. The gas generator according to claim 1, wherein said form fit for fixing said second axial end (29; 29') of said combustion chamber insert (24) takes place through a deformation of said second axial end (29; 29') in a state of said combustion chamber insert (24) when inserted in said outer housing. 8. The gas generator according to claim 1, wherein at least one bead-shaped depression (44; 44') is formed at said second axial end (29; 29') of said combustion chamber insert, by means of said depression (44; 44') a form fit is achieved. 9. The gas generator according to claim 1, wherein said axial ends (28, 29; 29') of said combustion chamber insert (24; 24') lie flat against an inner side of a section (14; 50) of said outer housing (12). 10. The gas generator according to claim 1, wherein said combustion chamber insert (24) at its axial ends (28, 29) and an inner side of said outer housing (12) taper conically to form receptacles (45, 46), and said combustion chamber insert (24) is held axially braced between said receptacles (45, 46) in said outer housing (12) and with a form fit in radial direction. 11. A method for assembling of a gas generator, comprising the steps of a) providing a gas generator having an oblong outer housing (12) and an elongated combustion chamber insert (24; 24'; 424; 524) for containing a solid propellant (26), with a tubular wall comprising a perforated sheet and having a first and a second axial end (28, 29; 29'), said perforated sheet comprising through holes extending through the sheet, b) inserting said combustion chamber insert (24; 24'; 424; 524) into said outer housing (12) and fixing said first axial end (28) thereof by a form fit in radial and axial directions in said outer housing (12) and c) deforming said second axial end (29; 29') of said combustion chamber insert (24) to provide a form fit in radial and axial direction to fix said second end (29; 29') in said outer housing (12) and prestressing the combustion chamber insert in radial and axial directions to fix the combustion chamber insert (24) in the outer housing. 12. A hybrid gas generator, comprising: an oblong outer housing (12) surrounding a pressure chamber filled with a medium under pressure, and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall comprising a perforated sheet, the combustion chamber insert (24; 24'; 424; 524) being arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424; 524) containing a solid propellant (26), said combustion chamber insert (24; 24'; 424; 524) having a first and a second axial end (28, 29; 29') and being held in said outer housing, and the tubular wall of said combustion chamber insert (24; 24'; 430; 530) being fixed at both axial ends (28, 29; 29') by a form fit in radial and axial directions to said outer housing (12), at least one of the axial ends (28, 29: 29') lying directly against an inner wall of the outer housing (12). 13. A gas generator, comprising: An oblong outer housing (12) having an inner wall forming a tapered section, and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424; 524) containing a solid propellant (26), having a first and a second axial end (28, 29; 29') and being held in said outer housing, and at least one of the first and second axial ends having a tapered section, the geometric shape of the tapered section of the housing and of the tapered section of the combustion chamber insert being adapted to each other so that in the tapered section of the outer housing (12) the tapered section of the tubular wall of said combustion chamber insert (24; 24'; 430; 530) lies against the inner housing wall with a form fit and is fixed at both axial ends (28, 29; 29') in radial and axial directions to said outer housing (12), and the combustion chamber insert is prestressed in the axial direction without further means for fastening the combustion chamber insert on the peripheral wall being provided. 14. A gas generator, prior to actuation comprising: an oblong outer housing (12) and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall comprising a perforated sheet, so that openings (40) are provided along a periphery of the tubular wall, the combustion chamber insert (24; 24'; 424; 524) being arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424; 524) containing a solid propellant (26), said combustion chamber insert (24; 24'; 424; 524) having a first and a second axial end (28, 29; 29') and being held in said outer housing, and the tubular wall of said combustion chamber insert (24; 24'; 430; 530) being fixed at both axial ends (28, 29; 29') by a form fit in radial and axial directions to said outer housing (12). 15. A method for assembling of a gas generator, comprising the steps of: a) providing a gas generator having an oblong outer housing (12) and an elongated combustion chamber insert (24; 24'; 424; 524) for containing a solid propellant (26), the combustion chamber insert (24; 24'; 424; 524) having a tubular wall comprising a perforated sheet so that openings (40) are provided along a periphery of the tubular wall prior to activation of the gas generator and having a first and a second axial end (28, 29; 29'), b) inserting said combustion chamber insert (24; 24'; 424; 524) into said outer housing (12) and fixing said first axial end (28) thereof by a form fit in radial and axial directions in said outer housing (12) and c) deforming said second axial end (29; 29') of said combustion chamber insert (24) to provide a form fit in radial and axial direction to fix said second end (29; 29') in said outer housing (12) and prestressing the combustion chamber insert in radial and axial directions to fix the combustion chamber insert (24) in the outer housing. 16. A gas generator, prior to actuation comprising: an oblong outer housing (12) and an elongated combustion chamber insert (24; 24'; 424; 524) with a tubular wall comprising a perforated sheet, said perforated sheet comprising through holes extending through the sheet, the combustion chamber insert (24; 24'; 424; 524) being arranged in said outer housing (12), said combustion chamber insert (24; 24'; 424; 524) containing a solid propellant (26), said combustion chamber insert (24; 24'; 424; 524) having a first and a second axial end (28, 29; 29') and being held in said outer housing, and the tubular wall of said combustion chamber insert (24; 24'; 430; 530) being fixed at both axial ends (28, 29; 29') by a form fit in radial and axial directions to said outer housing (12).