JPH0455151A - Mechanical ignition type inflator for air bag device - Google Patents

Abstract

PURPOSE:To restrict height of an inflator to low, and while obtain a large distance between an ignition bin and firing agent by arranging inflammation agent in a side of the firing agent to be arranged in the ignition direction of the ignition bin, and arranging gas generating agent in the surroundings of the inflammation agent and the firing agent. CONSTITUTION:In a mechanical ignition type inflator D, inflammation agent 13 is arranged in a side of firing agent 12 to be arranged in the ignition direction of an ignition bin 17b, and gas generating agent 14 is arranged in the surroundings of the inflammation agent 13 and the firing agent 12. Height of the inflator D can be therefore restricted to a height specified with an arrangement space of a starting device 17 and an arrangement space of the firing agent 12 and the inflammation agent 13, while a distance between the ignition bin 17b and the firing agent 12 can be made large within a height to be allowed by the inflator D. Consequently, collision energy of the ignition bin 17b against the firing agent 12 can be made large.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an inflator for inflating and deploying a bag body by supplying gas to the bag body in an air bag device for protecting a passenger installed in a vehicle, and particularly relates to an inflator that inflates and deploys the bag body by supplying gas to the bag body, and particularly relates to an ignition device including an ignition pin, a fire transfer agent, and an ignition pin. Equipped with a gas generating agent,
A mechanical ignition type for airbag devices in which the ignition pin collides with the igniter and ignites it through the mechanical operation of the starting device, causing the flame to propagate to the flame transfer agent and gas generating agent, generating a large amount of gas. Regarding the inflator.

[Conventional technology]

This type of inflator is, for example,
In the inflator of the same publication, the ignition pin of the starting device, the ignition agent, and the flame transfer agent are arranged in series in the height direction.

[Problem to be solved by the invention]

For this reason, in conventional inflators, the height is high, and if the height is restricted, it is not possible to maintain a large distance between the ignition pin and the ignition agent, and it is difficult to secure the collision energy of the ignition pin with the ignition agent. I'm worried. The present invention has been made to address the above-mentioned problems, and an object of the present invention is to provide an inflator that can increase the distance between the ignition pin and the ignition agent while keeping the height low.

[Means to solve the problem]

In order to achieve the purpose stated in 1., the present invention includes the following:
Ignition agent 1 A starter device is provided with an ignition pin, a flame transfer agent, and a gas generating agent.The mechanical operation of the starter device causes the ignition pin to collide with the igniter and ignite it, causing a flame to flow into the flame transfer agent and gas generating agent. In a mechanically ignited inflator for an airbag device that generates a large amount of gas by propagating the flame, a flame transfer agent is arranged on the side of the ignition agent arranged in the firing direction of the ignition pin. A gas generating agent was placed around the gunpowder and igniter.

[Actions and effects of the invention]

In the inflator according to the present invention, the height of the inflator can be suppressed to the height defined by the installation space of the starting device and the installation space of the ignition agent and the flame transfer agent, thereby reducing the height of the inflator. In addition to being able to
The distance between the ignition pin and the ignition agent can be increased within the allowable height of the inflator, and the impact of the ignition pin on the ignition agent can be increased.

【Example】

An embodiment of the present invention will be described below based on the drawings. FIG. 3 shows an airbag device B attached to a steering wheel A of an automobile (installed at a predetermined angle of inclination), and the airbag device B is a known bag attached to a base plate AI of the steering wheel. It is composed of a main body C, a mechanically ignited inflator D according to the present invention, and a steering wheel pano E that covers the upper part of these in the drawing. In addition, the steering wheel pad E is heated by the bag body C using gas from the inflator D.
When the bag body C is inflated and expanded, the thin groove part Ell
It is constructed so that it splits and expands. As shown in detail in FIG. 1, the mechanically ignited inflator D consists of a case +1 (see FIG. 3), which is assembled to the base plate A1 of the steering wheel A together with the lower end opening of the bag body C, and this case 11. 12. Incorporated igniter (detonator), each known per se. Fire transfer agent 13.
It is composed of a gas generating agent 14, a coolant 15 (hatched in the figure, but can be ventilated), a filter 16, and a starting device 17 assembled to the case 11. The case 11 is composed of an upper case Ila and a lower case Ilb that is sealed and fixed below the upper case Ila.In the center of the upper case Ila, there is a cylindrical part 11al that is open at the lower end.
, a small recess 11a2 that accommodates the ignition agent 12, a large recess 11a3 that accommodates the flame transfer agent 13, and both recesses 11a.
A through hole 11a4 that communicates the large recess 11a3 with the gas generating agent storage chamber R formed between the two cases lla and llb is provided. (see figure). Further, on the outer periphery of the upper case 1.1a, a mounting flange 1186 extending outward is provided, and a plurality of gas exhaust ports 11a7 are provided. The starting device 17 includes a case 17a, a pair of ignition pins 17b built into the case 17a, and an IJ gar shaft 1.
7C, ball 176, etc. (only one of which is shown in FIG. 1), and the case 11 mentioned above.
It is fitted into the cylindrical portion 11al of the upper case lla and is fixed with a screw cap 18 to prevent removal. The ignition pin 17b is configured to be fired upward in the drawing by a spring 17e when disengaged from the trigger shaft 17c, and has the function of colliding with the ignition agent 12 and igniting it. . In addition, ignition pin 1
The firing direction of 7b is defined by a guide sleeve 17f assembled to case 17a. The trigger shaft 17c is rotatably assembled to the case 17a at a pin portion 17c1 having a locking portion with the ignition pin 17b, and is biased counterclockwise in the drawing by a bias spring 17g to engage with the pin 17d. It matches. The ball 17d is attached to the cylinder 17 assembled to the case 17a.
h, and has a function of rotating the trigger shaft 17c in the clockwise direction in the figure against the bias spring 17g when a predetermined inertia acts downward in the figure due to deceleration due to a vehicle collision. have. In this embodiment configured as described above, when a predetermined inertia acts on the ball 17d downward in the figure due to deceleration due to a vehicle collision, the ball 17d moves downward in the figure and the trigger shaft 17c resists the bias spring 17g. Rotate clockwise as shown. Therefore, the engagement between the trigger shaft 17c and the ignition pin 17b is released, and the ignition pin 1
7b is fired upward in the figure by a spring 17e, collides with the igniter 12, and ignites it. Therefore, the flame from the ignition agent 12 passes through the through hole 11a4 to the flame transfer agent 13.
The flame transfer agent 13 is ignited and the flame transfer agent 13 is ignited.
The flame propagates to the gas generating agent 14 through the through hole 11a5, igniting the gas generating agent 14, and a large amount of gas generated from the gas generating agent 14 passes through the coolant 15 and the filter 16 and exits from the gas outlet 11a7 of the case 11. The liquid is ejected into the bag body C, and the bag body C is inflated and deployed. Therefore, in this embodiment, in the mechanically ignited inflator D, the transfer agent 13 is disposed on the side of the ignition agent 12 disposed in the firing direction of the ignition pin 17b.
Since the gas generating agent 14 is arranged around the ignition agent 12, the height of the inflator D is set to the height defined by the installation space of the starting device 17 and the installation space of the ignition agent 12 and the transfer agent 13. The height of the inflator D can be reduced, and the distance between the ignition pin 17b and the ignition agent 12 can be increased within the allowable height of the inflator D. Ignition pin 1
The impact energy of the ignition agent 7b on the ignition agent 12 can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a mechanically ignited inflator for an airbag device according to the present invention, FIG. 2 is a bottom view of the central portion of the upper case shown in FIG. 1, and FIG. FIG. 3 is a side view of the inflator attached to the steering wheel. Code 12: Ignition agent, gas generating agent, 17: Ignition pin, D. Description of 13: Fire transfer agent, 14: Starting device, 17b: Mechanically ignited inflator. Applicant: Toyota Motor Corporation Agent: Patent attorney Teru Hase (1 other person) C, Bag body/Mechanically ignited inflator

Claims (1)

[Claims] The starting device includes an ignition agent, an ignition pin, a flame transfer agent, and a gas generating agent.The mechanical operation of the starting device causes the ignition pin to collide with the igniter and ignite it, causing a flame to flow into the flame transfer agent and gas generating agent. In a mechanically ignited inflator for an airbag device that propagates and generates a large amount of gas,
For an airbag device, characterized in that a flame transfer agent is arranged on the side of an ignition agent arranged in the firing direction of an ignition pin, and a gas generating agent is arranged around the flame transfer agent and the ignition agent. Mechanically ignited inflator.