Gas generation for a safety device, the charge of which is initiated by a heat-generating means
First Claim
1. A gas generator for a safety device for a motor vehicle, the gas generator comprising:
- at least a first chamber and a second chamber, the first chamber isolated from the outside, the second chamber in communication with the first chamber;
an energetic charge disposed in the first chamber, the energetic charge being a mixture of at least one oxidizing charge and one reducing charge for which an oxygen balance of reaction products is equilibrated; and
a heat-generating device for generating sufficient heat for triggering and sustaining combustion of the energetic charge without any chemical interaction between the heat generating device and the energetic charge;
wherein the second chamber receives gases generated by reaction of the energetic charge within the first chamber and the gases are discharged via at least one discharge aperture of the second chamber that is in communication with the outside; and
wherein the energetic charge is formed of an assembly of distinct unit charges, the unit charges being each separated by a destructible screen which provides low resistance to heat and retards combustion to decrease combustion speed.
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Accused Products
Abstract
A gas generator for a safety device for a motor vehicle, comprises at least two distinct chambers which communicate with each other through at least one opening or nozzle. A first chamber is isolated from the outside. A second chamber or “diffusion” chamber is able to receive gases generated by the combustion of a solid pyrotechnical charge placed in the first chamber, and to discharge them towards the outside. The solid charge is a mixture consisting of at least one oxidizing charge and a reducing charge, the oxygen balance of which is equilibrated. A heat generator is provided which generates sufficient heat for triggering and sustaining the combustion of the charge without any other interaction, notably of the chemical type, between the heat generator and the charge.
40 Citations
21 Claims
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1. A gas generator for a safety device for a motor vehicle, the gas generator comprising:
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at least a first chamber and a second chamber, the first chamber isolated from the outside, the second chamber in communication with the first chamber; an energetic charge disposed in the first chamber, the energetic charge being a mixture of at least one oxidizing charge and one reducing charge for which an oxygen balance of reaction products is equilibrated; and a heat-generating device for generating sufficient heat for triggering and sustaining combustion of the energetic charge without any chemical interaction between the heat generating device and the energetic charge; wherein the second chamber receives gases generated by reaction of the energetic charge within the first chamber and the gases are discharged via at least one discharge aperture of the second chamber that is in communication with the outside; and wherein the energetic charge is formed of an assembly of distinct unit charges, the unit charges being each separated by a destructible screen which provides low resistance to heat and retards combustion to decrease combustion speed. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 19, 20, 21)
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4. A gas generator for a safety device for a motor vehicle, the gas generator comprising:
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at least a first chamber and a second chamber, the first chamber isolated from the outside, the second chamber in communication with the first chamber; an energetic charge disposed in the first chamber, the energetic charge being a mixture of at least one oxidizing charge and one reducing charge for which an oxygen balance of reaction products is equilibrated; and a heat-generating device for generating sufficient heat for triggering and sustaining combustion of the energetic charge without any other interaction, notably of a chemical type, between the heat generating device and the energetic charge; wherein the second chamber receives gases generated by reaction of the energetic charge within the first chamber and the gases are discharged via at least one discharge aperture of the second chamber that is in communication with the outside; wherein the energetic charge includes an aqueous solution including 65 to 75% water and 25 to 35% calcium chloride. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification