A gas generator for an airbag includes a first gas reserve with a first orifice, a first mechanism arranged for opening the first gas reserve, and a diffusion chamber arranged for diffusing the discharge gases. The generator additionally includes a mixing chamber comprising at least one first commun
A gas generator for an airbag includes a first gas reserve with a first orifice, a first mechanism arranged for opening the first gas reserve, and a diffusion chamber arranged for diffusing the discharge gases. The generator additionally includes a mixing chamber comprising at least one first communication surface with the diffusion chamber. The gas generator further including a second mechanism comprising a second actuator and a mobile obturator between a first obstruction position, in which it obstructs a second communication surface with a diffusion chamber and a second passage position, in which the second communication surface is free.
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1. A gas generator for an airbag comprising: a first pressurized gas reserve with a first discharge orifice,a second pressurized gas reserve with a second discharge orifice,a first mechanism comprising a first actuator arranged for opening the first and second pressurized gas reserves;a diffusion ch
1. A gas generator for an airbag comprising: a first pressurized gas reserve with a first discharge orifice,a second pressurized gas reserve with a second discharge orifice,a first mechanism comprising a first actuator arranged for opening the first and second pressurized gas reserves;a diffusion chamber arranged for diffusing towards the airbag the gas discharged by the first and second discharge orifices;a mixing chamber in direct communication with the first discharge orifice and the second discharge orifice, and including at least one first communication surface with the diffusion chamber; anda second mechanism having a second actuator and a mobile obturator between a first obstruction position, in which the mobile obturator obstructs a second communication surface of the mixing chamber with the diffusion chamber, and a second passage position, in which the second communication surface is free, the second actuator, when actuated, being arranged for moving the mobile obturator from one of the first or of the second position to the other position. 2. The generator according to claim 1, wherein the first communication surface is defined by at least one regulation orifice and in that the second communication surface is defined by at least one second regulation orifice distinct from the at least one first regulation orifice. 3. The generator according to claim 1, wherein the first communication surface is defined by a first portion of at least one regulation orifice and the second communication surface is defined by the remainder of the at least one regulation orifice. 4. The generator according to claim 1, wherein: the first orifice is obturated by a first lid,the second orifice is obturated by a second lid, in that the first mechanism includes a first support, mobile from a first supporting position, in which the first support supports the first and second lids being subjected to pressure of the pressurized gases, towards a second opening position, in which the first support no longer supports the first and second lids,the first actuator is arranged for moving the first mobile support from the first supporting position towards the second opening position,the pressure of the pressurized gases is predefined for causing the opening of the first and second lids when the first and second lids are not supported. 5. The generator according to claim 4, wherein the second actuator is arranged for moving the first mobile support from the first supporting position towards the second opening position. 6. The generator according to claim 4, wherein the first mobile support is arranged for sliding in the mixing chamber in order to pass from the first supporting position towards the second opening position. 7. The generator according to claim 4, wherein: the first mobile support includes two tabs each having a free end and a folding end bound to the first mobile support,in the first supporting position of the first mobile support, the free ends of the tabs bear upon the mixing chamber, each tab supporting the first or the second lid by withstanding a force exerted by the first or the second lid subject to the pressure of the pressurized gases,in the second opening position of the first mobile support, the free ends of the tabs are released from bearing upon the mixing chamber, so that each tab deforms in the folding end under the action of the force exerted by the first or second lid. 8. The generator according to claim 4, wherein the first mobile support is controlled by a first drawer sliding in cavities of the mixing chamber, the first drawer including cavities arranged for defining in cooperation with the cavities of the mixing chamber the first communication surface, when the first mobile support is in the second opening position. 9. The generator according to claim 4, wherein the first mobile support is mobile in rotation in order to pass from the first supporting position to the second opening position. 10. The generator according to claim 4, wherein the first mobile support includes a deformable portion connected to the generator, and the first mobile support passes from the first supporting position to the second opening position by deforming the deformable portion. 11. The generator according to claim 1, wherein the mobile obturator is guided in cavities of the mixing chamber, and the mobile obturator includes cavities arranged for defining the second communication surface, cooperating with the cavities of the mixing chamber, when the mobile obturator is in the second passage position. 12. The gas generator according to claim 1, wherein the mobile obturator is arranged for sliding in the mixing chamber in order to pass from the first obstruction position to the second passage position. 13. The gas generator according to claim 1, wherein the mobile obturator is mobile in rotation in order to pass from the first obstruction position to the second passage position. 14. The gas generator of claim 1, in combination with a safety module having at least one inflatable bag. 15. The gas generator according to claim 1, in combination with an automobile.
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