Gas generator
First Claim
Patent Images
1. A gas generator, comprising:
- a housing composed of a peripheral wall portion having a gas discharge port, a top plate, and a bottom plate, the top plate and the bottom plate bulging outwardly upon activation of the gas generator;
a collar directly attached to the bottom plate;
ignition means supported by the collar and accommodated inside the housing;
a tubular member including an upper end and a lower end and provided concentrically with respect to and within the housing such that the lower end is in engagement with the collar and the tubular member defines, in an inner side and an outer side thereof, a first combustion chamber, accommodating a first gas generating agent, and a second combustion chamber, accommodating a second gas generating agent, respectively, the tubular member being provided with a reduced-diameter portion forming a step in the upper end, and a main portion having a diameter larger than the reduced-diameter portion, a plurality of communication holes for communicating the first combustion chamber with the second combustion chamber being provided only in the main portion;
an annular plane extending in a radial direction of the housing from the upper end of the tubular member and including, in an inner side thereof, a bent portion, and being provided such that the bent portion abuts against the step; and
an annular filter disposed so as to surround the tubular member, whereinthe housing is provided with an upper annular inclined surface formed between the peripheral wall portion and the top plate, and a lower annular inclined surface formed between the peripheral wall portion and the bottom plate, a first angle of the upper annular inclined surface with respect to an imaginary line extending perpendicular to an axial direction of the housing and a second angle of the lower annular inclined surface with respect to the imaginary line do not substantially change before and after the activation of the gas generator, andthe annular filter is disposed such that an upper end surface and a lower end surface thereof abut against the upper annular inclined surface and the lower annular inclined surface, respectively, and a gap is provided between an outer peripheral surface of the annular filter and the peripheral wall portion of the housing.
1 Assignment
0 Petitions
Accused Products
Abstract
A housing 11 has an upper annular inclined surface 14 and a lower annular inclined surface 15. An annular filter 20 accommodated inside the housing has the end surface shape matching that of the inclined surfaces 14, 15. When the housing expands and deforms in the axial direction by the pressure during actuation, the inclined surfaces 14, 15 cannot be easily deformed. Therefore, the gas is prevented from leaking from the abutment portion of the inclined surfaces 14, 15 and annular filter 20. As a result, the entire gas is discharged via the annular filter 20.
-
Citations
11 Claims
-
1. A gas generator, comprising:
-
a housing composed of a peripheral wall portion having a gas discharge port, a top plate, and a bottom plate, the top plate and the bottom plate bulging outwardly upon activation of the gas generator; a collar directly attached to the bottom plate; ignition means supported by the collar and accommodated inside the housing; a tubular member including an upper end and a lower end and provided concentrically with respect to and within the housing such that the lower end is in engagement with the collar and the tubular member defines, in an inner side and an outer side thereof, a first combustion chamber, accommodating a first gas generating agent, and a second combustion chamber, accommodating a second gas generating agent, respectively, the tubular member being provided with a reduced-diameter portion forming a step in the upper end, and a main portion having a diameter larger than the reduced-diameter portion, a plurality of communication holes for communicating the first combustion chamber with the second combustion chamber being provided only in the main portion; an annular plane extending in a radial direction of the housing from the upper end of the tubular member and including, in an inner side thereof, a bent portion, and being provided such that the bent portion abuts against the step; and an annular filter disposed so as to surround the tubular member, wherein the housing is provided with an upper annular inclined surface formed between the peripheral wall portion and the top plate, and a lower annular inclined surface formed between the peripheral wall portion and the bottom plate, a first angle of the upper annular inclined surface with respect to an imaginary line extending perpendicular to an axial direction of the housing and a second angle of the lower annular inclined surface with respect to the imaginary line do not substantially change before and after the activation of the gas generator, and the annular filter is disposed such that an upper end surface and a lower end surface thereof abut against the upper annular inclined surface and the lower annular inclined surface, respectively, and a gap is provided between an outer peripheral surface of the annular filter and the peripheral wall portion of the housing. - View Dependent Claims (2, 3, 4, 5, 6, 10)
-
-
7. A gas generator, comprising:
-
a housing including a top plate, a bottom plate, and a peripheral wall including a gas discharge port, the housing further including an upper annular inclined surface formed between the peripheral wall and the top plate, and a lower annular inclined surface formed between the peripheral wall and the bottom plate, the upper annular inclined surface and the lower annular inclined surface encircling the top plate and the bottom plate, respectively, the top plate and the bottom plate bulging outwardly upon activation of the gas generator, the bottom plate being provided with a hole; a collar attached directly to the hole; a tubular member including an upper end and a lower end and provided concentrically with respect to and within the housing such that the lower end is in engagement with the collar and the tubular member defines, in an inner side and an outer side thereof, a first combustion chamber, accommodating a first gas generating agent, and a second combustion chamber, accommodating a second gas generating agent, respectively, the tubular member being provided with a reduced-diameter portion forming a step in the upper end, and a main portion having a diameter larger than the reduced-diameter portion, a plurality of communication holes for communicating the first combustion chamber with the second combustion chamber being provided only in the main portion; an annular plane extending in a radial direction of the housing from the upper end of the tubular member and including, in an inner side thereof, a bent portion, and being provided such that the bent portion abuts against the step; and an annular filter provided inside the housing so as to surround the tubular member, such that a top end and a bottom end of the annular filter keep abutting the upper annular inclined surface and the lower annular inclined surface, respectively, upon an activation of the gas generator, while the top plate and the bottom plate bulge outwardly, wherein a first angle between an imaginary extension line of the top plate before bulging and an imaginary tangential line of the top plate after bulging is substantially equal to a second angle between the imaginary extension line of the top plate and the upper annular inclined surface, wherein a third angle between an imaginary extension line of the bottom plate before bulging and an imaginary tangential line of the bottom plate after bulging is substantially equal to a fourth angle between the imaginary extension line of the bottom plate and the lower annular inclined surface. - View Dependent Claims (8, 9, 11)
-
Specification