JP2557881Y2 - Gas generator for airbag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator for an airbag for protecting an occupant from an impact, and more particularly to a structure of a combustor cup.

[0002]

2. Description of the Related Art A combustor cup is set outside a gas generating agent container, and adjusts a combustion gas of the gas generating agent to a constant gas pressure so as to uniformly jet through a plurality of through holes. It is.

[0003] Some conventional gas generators include a rivet disposed circumferentially on a circular portion of a housing, and a combustor cup disposed inside the rivet arrangement.

In this case, depending on the circumferential position of the combustor cup, the two overlap so that the rivet closes the through hole formed in the combustor cup, which may adversely affect the gas flow. .

In the prior art, since there is no positioning or fixing means, it has been difficult to accurately position the through hole and the rivet at an optimum position where the rivet does not overlap. In addition, even if it is set at a correct position at the time of assembling, there is a possibility that this position is shifted due to vibration or the like.

Therefore, an object of the present invention is to provide a novel gas generator for an airbag which solves the above-mentioned problems of the prior art.

[0007]

SUMMARY OF THE INVENTION A gas generator for an airbag according to the present invention has a housing having a circular portion and a peripheral wall formed on the outer periphery of the circular portion. A rivet provided, a reinforcing rib formed in the circular portion, a gas generator provided in the housing, and an opening communicating between the housing and the airbag; The apparatus includes a combustor cup that covers the gas generant container filled with the gas generant and is disposed inside the rivet arrangement, and the combustor cup has a cylindrical shape having one end closed and the other end open. A gas generator having a plurality of through holes for gas ejection arranged in the circumferential direction, and introducing a gas generated in the gas generator by an impact into an airbag to protect an occupant from the impact. The combustor cup is formed at one end side and is positioned at a position where the through hole of the combustor cup and the rivet do not interfere with each other at the seat portion which is in contact with the inner surface of the circular portion of the housing and which engages with the reinforcing rib. It is characterized by having an engaging part which performs.

[0008] The combustor cup has an engaging portion on its seat for engaging the reinforcing rib. The engaging portion is formed at a predetermined position of the seat portion so as to position the combustor cup at a position where the through hole of the combustor cup and the rivet do not overlap each other when the engaging rib is engaged with the reinforcing rib. This allows
The combustor cup is positioned at the optimum position during assembly and is fixed to the housing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view of the present gas generator.
The housing of the gas generator includes a diffuser shell 1 and a closure shell 3 which forms a space 2 together with the diffuser shell 1. The diffuser shell 1 and the closure shell 3 have circular portions 1a and 3a and peripheral wall portions 1b and 3b formed on the outer periphery of the circular portion, respectively.

A large number of rivets 23 are circumferentially arranged on the circular portions 1a and 3a of the housing.
Numeral 3 connects the diffuser shell 1 and the closure shell 3 to each other near the peripheral wall of the housing. Also,
Reinforcing ribs 20 are formed radially in each of the circular portions 1a and 3a (eight in each circular portion in this embodiment). The reinforcing rib 20 protrudes to the outer surface side of the circular portion, and forms a recess 20a on the inner surface of the circular portion.

In the space 2, there is provided a gas generator comprising an igniter, a canister container, and a combustor cup for covering the same.

In the space 2, an ignition device housing chamber 4 is defined at the center by a female screw member 16, and a combustion chamber 5 is defined outside thereof by a combustor cup 14, and the combustion chamber 5 is further defined.
, A coolant / filter chamber 19 is formed. The coolant / filter chamber 19 further holds the retainer 11.
Is defined in the upper and lower tiers.

In the igniter accommodating chamber 4, an enhancer (a transfer charge) 6 and a squib (igniter) 10 constituting an igniter are provided.
And are housed. The transfer charge 6 is loaded on a female screw member 16, and the squib 10 is loaded on a male screw member 17 screwed to the female screw member 16. In the combustion chamber 5, a gas generating agent 15 and a pre-filter 20
An annular canister container 18 is accommodated with its inner periphery fitted to the outer periphery of the female screw member 16 and its outer periphery fitted to the inner periphery of the combustor cup 14. Further, in the coolant / filter chamber 19, the filter 12
However, the coolant 13 is accommodated in the lower stage, respectively.

A passage 7 for transmitting the flame of the transfer charge 6 to the combustion chamber 5 is provided between the ignition device accommodating chamber 4 and the combustion chamber 5, and between the combustion chamber 5 and the coolant / filter chamber 19. An opening for introducing gas generated in the combustion chamber 5, that is, a through hole 14b of the combustor cup is provided, and a coolant and a filter are passed between the coolant / filter chamber 19 and an airbag (not shown). An opening 9 for introducing gas is provided.

The combustor cup 14 has a cylindrical shape with one end closed and the other end open, and is arranged inside a rivet arrangement arranged in a large number in the circumferential direction. The cylindrical portion 14a at the open end of the combustor cup is provided with a plurality of through holes 14b provided in the circumferential direction for gas ejection.
Are drilled.

Further, a seat portion 14c is formed at the closed one end side. The seat portion 14c has a through hole 14d at the center thereof into which the female screw member 16 can be fitted, and is in contact with the inner surface of the circular portion 1a of the diffuser shell. Eight engagement portions 21 are formed radially in the seat portion 14c,
Each engaging portion 21 can be engaged with the corresponding reinforcing rib. The engaging portion is formed so as to position the combustor cup at a position where the rivet 23 does not overlap with the through hole 14b of the combustor cup when engaged with the reinforcing rib during assembly. This engaging portion 21 is
c has a protruding portion 22 protruding on the outer surface side thereof.
2 engages in the recess 20a of the reinforcing rib.

By engaging the projecting portion 22 of the combustor cup with the recess 20a of the reinforcing rib, the combustor cup is positioned at the time of assembly, and the combustor cup is fixed to the housing.

When a sensor (not shown) is actuated by an impact, the squib 10 is ignited, whereby the transfer charge 6 is ignited. The high-temperature and high-pressure flame generated thereby passes through the passage 7 and breaks through the wall of the aluminum container 18 filled with the gas generating agent, and ignites the gas generating agent 15 inside. The gas generated in the container 18 is jetted uniformly through the through holes 14b without being interrupted by the rivets 23, passes through the coolant 13 and the filter 12, and flows into the airbag through the opening 9.

[0020]

Since the present invention is configured as described above, it is possible to accurately position the combustor cup at an optimum position where the through hole of the combustor cup and the rivet do not interfere with each other during assembly.

Further, even after the assembling, the position of the combustor cup can be fixed at the position at the time of assembling without the possibility that the position is shifted by vibration or the like. As a result, the gas flow is not disturbed, and a normal gas flow is always obtained.
The stable operation of the gas generator is guaranteed.

Further, since the gas ejection is uniform, the thermal damage of the airbag can be prevented.

[Brief description of the drawings]

FIG. 1 is a half sectional view of the gas generator.

FIG. 2 is a perspective view of the combustor cup according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 diffuser shell 1a circular portion 1b peripheral wall portion 2 space 3 closure shell 3a circular portion 3b peripheral wall portion 9 opening 14 combustor cup 14a cylindrical portion 14b through hole 14c seat portion 15 gas generating agent 18 gas generating agent container 20 reinforcing rib 21 engaging portion 23 rivets

Claims (1)

(57) [Scope of request for utility model registration] 1. A housing having a circular portion and a peripheral wall formed on an outer peripheral portion of the circular portion, a rivet provided in a circumferential direction on the circular portion of the housing, and a reinforcement formed on the circular portion. A rib, a gas generator disposed in the housing, and an opening communicating between the housing and the airbag, wherein the gas generator covers a gas generating agent container filled with a gas generating agent. And a combustor cup disposed inside the rivet arrangement, wherein the combustor cup has a cylindrical shape having one end closed and the other end open, and a plurality of gas jets which are circumferentially disposed in the cylindrical portion. A gas generator having a through-hole and introducing a gas generated by the gas generator by an impact into an airbag to protect an occupant from an impact, wherein the combustor cup is formed at one end and the The seat which abuts on the inner surface of the circular portion of the jing is provided with an engaging portion which engages with the reinforcing rib and positions the combustor cup at a position where the through hole of the combustor cup and the rivet do not interfere with each other. Gas generator for airbags.