JPH1120595A - Passenger protecting air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a passenger protecting air bag, more applicable to a passenger, by developing the air bag in a small size when the gas pressure of an inside cushion bag is low and developing it in a large size when the gas pressure is high to form the air bag into a suitable shape to conditions. SOLUTION: A passenger protecting air bag has a rectangular housing open on one side face, an inflator, a cushion bag 20a to be developed toward the upper body of a passenger and an air bag door on the open face of the housing. The cushion bag 20a contains an inside cushion bag 23 in which a plurality of vent holes 25 are formed to change their openings with gas pressure and an outside cushion bag 24 applied to the outside of the inside cushion bag 23 to be filled by the opening of the vent holes 25 with the pressure of the inside cushion bag 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting a passenger, and more particularly, to a double inner / outer cushion bag having a variable size according to the internal pressure of the cushion bag. The present invention relates to a passenger protection airbag.

[0002]

2. Description of the Related Art Generally, an airbag is installed on a crash pad or a door of a vehicle so as to protect passengers in the event of a vehicle collision. FIGS. 3 and 4 show a conventional typical passenger protection airbag related to such a technique.

The airbag is mounted on the upper part of the crash pad 12 together with the cowl cross member 10 by a plurality of fastening members 14. The airbag includes a rectangular housing 16 having one open side, an inflator 18 that is ignited in a collision in the housing 16 to generate gas, and an airbag that is integrated with the inflator 18 and faces the upper body of the passenger. And a curved airbag door 22 mounted on an open surface of the housing 16 so that one end thereof is cut and opened when the cushion bag is deployed.
It is composed of

In the conventional passenger protection airbag constructed as described above, when the vehicle collides, the inflator 18 is ignited by an ignition means (not shown) to be instantaneously inflated and the cushion bag 20 is deployed. Due to the gas pressure in the cushion bag 20 to be cut, the cut line on the side of the air bag door 22 is cut and the air bag door 22 is opened, and at the same time, the cushion bag 20 is deployed toward the passenger as shown in FIG. Will do.

[0005]

However, in the above-described passenger protection airbag, since the cushion bag 20 is determined to have a fixed size at the time of a vehicle collision, the gas pressure in the cushion bag 20 is as designed. Only when the airbag door 22 is opened, and then the cushion bag 20 is also deployed, so that the gas may not be filled in a short time, and thus the pressure in the cushion bag 20 becomes lower than the design pressure. If it is low, there is a problem that this function as an airbag for protecting passengers during a collision cannot be expected.

The object of the present invention is research and development for solving the above-mentioned various problems in the prior art. The present invention is developed to be compact when the gas pressure of the internal cushion bag is low, and to be expanded when the gas pressure is high. It is an object of the present invention to provide an airbag for protecting a passenger, the size of which is variable depending on the gas pressure of the internal cushion, thereby obtaining a shape of the airbag adapted to the situation and improving the passenger handling.

[0007]

In order to achieve the above object, the present invention provides a housing 16 having an open surface, an inflator 18 mounted in the housing 16 and ignited in the event of a collision to generate gas, and Inflator 18
And a cushion bag 20a formed integrally with the cushion bag 20a so as to be deployed toward the upper body of the passenger, and an open surface of the housing 16 having one side end cut and opened when the cushion bag 20a is deployed. A passenger airbag having a curved airbag door 22 mounted in such a manner that the cushion bag 20a
Is an inner cushion bag 23 in which a plurality of vent holes 25 whose opening degree changes according to gas pressure are formed,
The outer cushion bag 24 covered on the outside of the inner cushion bag 23 is opened so that the vent hole 25 is opened and filled by the pressure of the inner cushion bag 23.
And an airbag for protecting passengers.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a passenger protection airbag according to the present invention will be described in more detail. FIG. 1 is a cross-sectional view showing an expanded body of a cushion bag of a passenger protection airbag according to the present invention, and FIG. 2 is a cross-sectional view showing an expanded body of the cushion bag due to gas pressure in the present invention.

Although not shown in these figures, as in the conventional example shown in FIGS. 3 and 4, a rectangular housing 16 having one open side is ignited at the time of collision to generate gas. The inflator 18 is provided with a spherical double cushion airbag 2 which is deployed toward the upper body of the passenger as shown in FIGS.
0a is integrally formed.

A curved airbag door 22 is mounted on the open surface of the housing 16 so that one side end is cut and opened when the cushion bag 20a is deployed.

The cushion bag 20a is
The cushion bag 20a is formed double so that the deployed size of the cushion bag 20a can be changed by gas pressure. That is, this is the internal cushion bag 2 having a plurality of vent holes 25 whose opening size changes depending on the internal gas pressure.
3 and an external cushion bag 24 that covers the outside of the internal cushion bag 23 so that the vent hole 25 is opened and filled by the pressure of the internal cushion bag 23.

The passenger-protecting air bag according to the present invention having the above-described structure is inflated instantaneously by igniting an inflator 18 by an ignition means (not shown) when a vehicle collides, as in the prior art. Bag 20a
Due to the gas pressure in the cushion bag 20a, the airbag door 22 side cut line is cut and the airbag door 22 is opened, and at the same time, the cushion bag 20 is deployed toward the passenger and the passenger is released. Will be protected.

At this time, as shown in FIGS. 2A to 2C, the size of the cushion bag 20a is variably developed by the gas pressure.

More specifically, when the gas generation is small and the gas pressure is low, the vent hole 25 of the internal cushion bag 23 is not opened and the internal cushion bag 23 is expanded to the size of the internal cushion bag 23 as shown in FIG. You. And
If the gas pressure is slightly lower than the design pressure, only a part of the vent hole 25 of the inner cushion bag 23 is opened, so that the outer cushion bag 24 outside the inner cushion bag 23 as shown in FIG. A little gas is filled and deployed.

If the gas pressure is a gas pressure having a high design value, the vent hole 15 of the inner cushion bag 23 is opened, so that the inner / outer cushion bugs 21 and 22 are connected to each other as shown in FIG. Both are deployed to the maximum. Therefore, the inner / outer cushion bag 20a of an appropriate size is deployed by the gas pressure generated from the inflator 18, so that an airbag shape suitable for the situation can be obtained, and as a result, passenger responsiveness is improved. Things.

[0016]

As described above in detail, the airbag for protecting a passenger according to the present invention is developed into a small internal cushion bag when the gas pressure generated from the inflator is low, and is increased when the gas pressure is high. Since it is deployed in a large size, there is a unique effect that the size is variable depending on the gas pressure of the internal cushion bag.
Further, since the size of the cushion bag is variable depending on the gas pressure generated from the inflator, it is possible to obtain an airbag shape suitable for the situation, which has a specific effect of improving passenger responsiveness.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a passenger protecting airbag according to the present invention.

FIG. 2 is a cross-sectional view illustrating a deployed state of the airbag due to the internal pressure of the airbag according to the present invention.

FIG. 3 is a cross-sectional view showing a conventional typical passenger protection airbag.

FIG. 4 is a schematic view showing a state where the cushion bag of FIG. 3 is deployed.

[Explanation of symbols]

 Reference Signs List 10 cowl cross member 12 crash pad 14 fastening member 16 housing 18 inflator 20, 20a cushion bag 22 airbag door 23 internal cushion bag 24 external cushion bag 25 vent hole

Claims (1)

[Claims] 1. A housing 16 having an open surface, an inflator 18 mounted in the housing 16 and ignited at the time of a collision to generate gas, and an inflator 18
And a cushion bag 20a formed integrally with the cushion bag 20a so as to be deployed toward the upper body of the passenger, and an open surface of the housing 16 having one side end cut and opened when the cushion bag 20a is deployed. The cushion bag 20a is provided with a plurality of vent holes 25 whose degree of opening changes according to gas pressure. A passenger comprising: a bag 23; and an external cushion bag 24 that is covered on the outside of the internal cushion bag 23 so that the vent hole 25 is opened and filled by the pressure of the internal cushion bag 23. Airbag for protection.