Filter for a gas generator
First Claim
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1. A pyrotechnical gas generator comprising:
- a housing;
a combustion chamber in the housing;
a filter including a filtering material; and
a protection screen, the protection screen forms at least one sealed loop arranged to surround at least a part of a charge of the pyrotechnical gas generator in such a manner as to protect at least a part of the filtering material from a pressure wave from ignition of the chargewherein the filtering material has a height and the protection screen covers the filtering material at a midpoint of the height,wherein the filter has a first axial end adjacent a first end of the housing and a second axial end adjacent a second end of the housing such that the first and second axial ends of the filter are held to the housing at contact zones to maintain positioning of the filter within the housing, andwherein the protection screen is radially spaced from both the first end of the housing and the second end of the housing.
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Abstract
A filter for a pyrotechnical gas generator includes a filtering material and a protection screen. The protection screen forms at least one sealed loop arranged so as to surround at least a part of a charge of propergol of the pyrotechnical gas generator in such a manner as to protect this at least one part of the filtering material from a pressure wave from the ignition of the propergol charge.
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Citations
19 Claims
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1. A pyrotechnical gas generator comprising:
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a housing; a combustion chamber in the housing; a filter including a filtering material; and a protection screen, the protection screen forms at least one sealed loop arranged to surround at least a part of a charge of the pyrotechnical gas generator in such a manner as to protect at least a part of the filtering material from a pressure wave from ignition of the charge wherein the filtering material has a height and the protection screen covers the filtering material at a midpoint of the height, wherein the filter has a first axial end adjacent a first end of the housing and a second axial end adjacent a second end of the housing such that the first and second axial ends of the filter are held to the housing at contact zones to maintain positioning of the filter within the housing, and wherein the protection screen is radially spaced from both the first end of the housing and the second end of the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A pyrotechnical gas generator comprising:
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a housing; a combustion chamber in the housing; a charge in the combustion chamber for creating inflation gases for an airbag, an igniter designed for igniting the charge, the igniter axially extending within the housing; a filter comprising a filtering material and a protection screen, the protection screen forms at least one sealed loop arranged so as to surround at least a part of the charge in such a manner as to protect at least a part of the filtering material from a pressure wave from the ignition of the charge, wherein the protection screen is radially positioned between the igniter and the filtering material, and wherein the protection screen is radially spaced from both the first end of the housing and the second end of the housing. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A pyrotechnical gas generator comprising:
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a housing having a first axial end and a second axial end; a combustion chamber within the housing; a charge in the combustion chamber for creating inflation gases for an airbag, an igniter for igniting the charge, the igniter axially extending in the housing; a filter comprising a filtering material and a protection screen, the protection screen forms at least one sealed loop arranged so as to surround at least a part of a charge in such a manner as to protect at least a part of the filtering material from a pressure wave from the ignition of the charge, the protection screen radially positioned between the igniter and the filtering materials, wherein a sidewall of the housing includes at least one vent and the protection screen is radially disposed between the igniter and the at least one vent, and wherein the protection screen is radially spaced from both the first axial end of the housing and the second axial end of the housing.
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Specification