JP3170331B2 - Emergency gas generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency gas generator, for example, for use in fastening a vehicle seat belt.

[0002]

2. Description of the Related Art Conventionally, an emergency gas generator is used as a device for urgently fixing, for example, an elastic seat belt in the event of a car accident or the like. The emergency gas generator in this case has a cylindrical case filled with a gas combustion generating agent and a squib serving as an igniter. In an emergency, the squib is operated to burn the gas combustion generating agent and blow out a large amount of gas in a predetermined direction to increase the pressure in a predetermined device to a predetermined range. The rate of increase should not be slow, but it can be dangerous if it is too sharp. Even if the gas gushes out once, it is not preferable that the generated pressure drops too much in the middle.

There are generally three methods for obtaining a desired pressure rise rate according to the purpose of use. That is, a method of changing the particle size of the gas combustion generating agent in the emergency gas generator, a method of changing the composition of the gas generating agent, and a method of changing the breaking strength of the sealing plate.

[0004] The method of changing the particle size of the gas combustion generating agent is a method of adjusting the particle size of the gas combustion generating agent, and adjusting the generation curve of generated gas during combustion by changing the combustion surface area of each particle. is there. In this case, in a large gas generator, the amount of the filled medicine is large, and the combustion surface area can be adjusted widely, which is effective. However, on the other hand, there is a problem that a small emergency gas generator having a small filling amount of the gas combustion generating agent cannot be used.

[0005] The method of changing the composition of the gas combustion generating agent is to selectively use a chemical having a high gas generation rate, a chemical having a low gas generation rate, a mixing ratio, and the like, thereby adjusting the pressure rise rate. In the case of this method, there is a problem that the combustion temperature and the type of combustion product gas are restricted depending on the selection of the composition, and it is difficult to utilize the gas in a wide range.

In the method of changing the breaking strength of the sealing plate, a gas-burning agent is filled in a cylindrical case and the sealing plate is mounted. The strength of the medicine filling portion is adjusted by the thickness of the sealing plate, and the amount of the gas combustion generating agent used is adjusted according to the strength. In this method, since the sealing plate is manufactured separately from the case in advance, there is a problem in that the cost of parts is increased, and when the case and the sealing plate are assembled into one, the blowing direction of the urgently generated gas cannot be fixed.

For this reason, there has been a problem that almost no emergency gas generators can stably increase the pressure even when the squib is operated.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides an emergency gas generator in which the pressure of the jet gas is effectively increased irrespective of the magnitude of the size. The purpose is to:

[0009]

An emergency gas generator according to the present invention, which has been made to achieve the above object, will be described with reference to FIG. The emergency gas generator according to the present invention is an emergency gas generator in which a bottomed cylindrical case 1 is filled with a gas combustion generating agent 2 and a squib 8 is attached to a mouth 6 side.
The bottom plate 3 is integrally formed with the body wall 4 and is provided with a portion thinner than the body wall 4, and the squib 8 is caulked to the edge of the mouth 6.

The inner diameter at the bottom plate 3 side is smaller than the inner diameter at the mouth side, and one step 7 is provided on the body wall 4, and the other step 12 is provided around the squib 8, so that both steps 7, 13 are formed. Mated,
The gas combustion generator 2 is sealed.

[0011]

In the emergency gas generator according to the present invention, when the squib 8 is operated in an emergency, the squib 8 burns the gas combustion generating agent 2 to generate a large amount of gas. The bottom plate 3 is weaker than the body wall 4. When the pressure in the case 1 rises and exceeds a certain value, the bottom plate 3 is crushed from the thin portion 5 and gas is stably blown out in the length direction of the body wall 4.

When the steps 1 and 13 are provided in the case 1 and the squib 8, respectively, the airtightness and moistureproofness of the gas-combustion-agent-filled portion are enhanced.

Since the case 1 has a cylindrical shape with a bottom, it can be used as a meter for measuring the filling amount when the gas combustion generating agent 2 is charged. By providing the steps 7 and 13 on the body wall 4 and the squib 8, no excessive force is applied to the gas combustion generating agent 2 during manufacturing.

[0014]

Embodiments of the present invention will be described below.

FIG. 1 is a partial sectional view showing one embodiment of the emergency gas generator of the present invention.

A gas combustion generator 2 is placed in a cylindrical case 1 having a bottom.
Is filled. The bottom plate 3 is formed integrally with the body wall 4, and a V-shaped groove 5 having a triangular cross section shown in FIG. 4 is provided in the center of the outer surface of the bottom plate 3, and the thickness of the V-shaped groove 5 is greater than the thickness of the body wall 4. Is also getting thinner.

The inner diameter of the case 1 on the side of the bottom plate 3 is smaller than the inner diameter of the mouth 6, and one of the tapered steps 7 is formed on the body wall 4.

A squib 8 is attached to the case opening 6. The squib 8 has a lead wire 9 and a large-diameter thick disk portion 1.
The small-diameter cylindrical portion 11 is connected to the center axis 0 at the same central axis, and the other step portion 12 is formed at the connecting portion. An O-ring 14 is fitted to the other step portion 12, and a taper 13 is formed on the side of the disk portion 10.

The tip of the cylindrical portion 11 of the squib 8 is the case 1
It is in contact with the gas combustion generating agent 2 filled therein. The O-ring 14 fitted to the other step 12 is pressed between the one step 7 and the one step 7 and the other step 12.
And the taper 13 of the other step 12 is in close contact with the taper of the one step 7. The periphery of the disk 10 is caulked by the edge of the mouth 6 of the case 1.

Such an emergency gas generator may be assembled and manufactured as follows. A bottomed cylindrical case 1 is formed. The inner diameter of the cylindrical case 1 on the side of the bottom plate 3 is
One of the tapered steps 7 is provided on the body wall 4 with a smaller diameter than the inner diameter of the body. A V-shaped groove 5 having a triangular cross section is formed in a cross at the center of the outer surface of the bottom plate 3.

As shown in the sectional view of FIG. 2, the filling amount is measured in the case 1 to fill the gas combustion generating agent 2, and then the squib 8 is mounted on the case 1 as shown in the sectional view of FIG.
The O-ring 14 is crimped between the other step 12 of the squib 8 and one step 7 of the body wall 4 to fit the two steps 7, 12 together. The taper 13 on the circumference of the disc 10 and the taper of the one step 7 are brought into close contact with each other, and the gas combustion generating agent 2 is sealed.
The edge of the mouth 6 is swaged so as to cover the disk 10.

In this embodiment, one step 7 and the other step 1
Since the O-ring 14 is press-fitted with the gas combustion generating agent 2, the gas-combustion generating agent 2 is not pressed during manufacturing. The O-ring 14 seals the charged gas combustion generating agent 2. Therefore, the airtightness of the filling portion is enhanced, and the moisture proof property is improved. In use, the combustion gas hardly blows back from the mouth 6.

As in the above example, the shape of the bottom plate 3 is such that not only the V-shaped groove 5 is formed in a cross shape, but also, for example, as shown in FIG. You may. A ring-shaped groove may be formed as shown in FIG. As shown in FIG. 7, the entire bottom plate 3 may be formed thin.

The gas combustion generating agent used in this embodiment was a single-base propellant, and the bottom plate 3 of the case 1 used was a cross-shaped V-shaped groove 5 as shown in FIG. The case 1 containing 1.0 g of the gas combustion generating agent and the case containing 0.8 g of the gas combustion generating agent were made into two types, and a squib 8 having an O-ring 14 attached on each gas combustion generating agent was prepared. Each was inserted and the edge of the mouth part 6 was caulked to complete.

The emergency gas generator was operated in a closed vessel for inspection, and the pressure change was measured by a sensor. The measured pressure change is shown by curves (C, D) in FIG.

In FIG. 8, A indicates the upper limit of the allowable pressure change. B indicates the lower limit of the allowable limit of the pressure change. C shows a pressure change curve when the dose is 1.0 g. D is 0.8
The pressure change curve at the time of g is shown.

Comparative Example An emergency gas generator was prepared in the same manner as in the example except that the V-groove 5 was not formed in the bottom plate 3, and a pressure change was measured by a sensor in the same manner as in the example.

The results are shown by curves (E, F) in FIG.

In FIG. 9, A indicates the upper limit of the allowable limit as in the embodiment. B indicates the lower limit of the allowable limit as in the embodiment.
E shows a pressure change curve when the dose is 1.0 g as in the example. F shows a pressure change curve when the drug amount is 0.8 g as in the example.

From the above results, it was found that the emergency gas generator of the present embodiment stably increased the pressure at an appropriate speed, and that the pressure drop was small during the ejection of the gas.

[0031]

As described above in detail, in the emergency gas generator of the present invention, when the gas is generated, the bottom plate is crushed and the gas is blown out in the pipe length direction of the body wall, so that the pressure of the blown gas is stable. And the pressure drop is small.

If the O-ring is crimped between the one step and the other step, an excessive force which tends to be generated when screwing is not applied to the gas combustion generating agent. Therefore, there is no danger of the gas combustion generating agent exploding, and mass production can be performed safely and inexpensively with mass production machines.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of an embodiment of an emergency gas generator to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a stage in which a case is filled with a gas combustion generating agent in a manufacturing stage of an emergency gas generator to which the present invention is applied.

FIG. 3 is a cross-sectional view showing a squib mounting step in a manufacturing step of the emergency gas generator to which the present invention is applied.

FIG. 4 is a view showing one embodiment of a case bottom plate of the emergency gas generator to which the present invention is applied.

FIG. 5 is a view showing another embodiment of the case bottom plate of the emergency gas generator to which the present invention is applied.

FIG. 6 is a view showing another embodiment of the case bottom plate of the emergency gas generator to which the present invention is applied.

FIG. 7 is a view showing another embodiment of the case bottom plate of the emergency gas generator to which the present invention is applied.

FIG. 8 is a diagram showing a gas pressure change of an embodiment of the emergency gas generator to which the present invention is applied.

FIG. 9 is a diagram showing a gas pressure change of the emergency gas generator in which the thickness of the bottom plate is not reduced.

[Explanation of symbols]

1 is a case, 2 is a gas combustion generating agent, 3 is a bottom plate, 4 is a body wall, 5 is a V groove, 6 is a mouth, 7 is one step, 8 is a squib, 12 is the other step, and 14 is O-ring.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-50-159866 (JP, A) JP-A-51-88468 (JP, A) JP-A-52-88938 (JP, A) JP-A-51-88 39838 (JP, A) JP-A-64-41440 (JP, A) Japanese Utility Model Laid-Open No. 49-54235 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01J 7/00-7 / 02 B60R 21/16-21/32

Claims (2)

(57) [Claims] 1. An emergency gas generator in which a bottomed cylindrical case is filled with a gas combustion generating agent and a squib is mounted on a mouth side, the bottom plate of the case is integrally formed with a body wall, and the body wall is formed. An emergency gas generator, characterized in that a thinner portion is provided and a squib is caulked to an edge of the mouth. 2. An inner diameter on the bottom plate side is smaller than an inner diameter on the mouth side, one step is provided on the body wall, and the other step is provided around the squib. The emergency gas generator according to claim 1, wherein the generating agent is sealed.