JP3088400B2 - Vehicle airbag device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle airbag device, and more particularly to a safety measure at the time of a collision.

[0002]

2. Description of the Related Art In order to ensure the safety of an occupant when driving a vehicle, an airbag device has attracted attention as an auxiliary restraint device when a seat belt is worn.

In this airbag device, when a sensor detects an impact due to a vehicle collision, gas is generated from an inflator, and an airbag folded in a pad is deployed by gas pressure to receive the occupant's body. The airbag is pushed by the reaction force and the gas inside is exhausted from the exhaust hole,
As a result, the shock of the occupant is absorbed and alleviated by the contraction of the airbag, thereby protecting the occupant.

[0004] An inflator for generating gas as described above is composed of an igniting agent, a transfer agent, and a gas generating agent.
The mechanism of gas generation is that when the igniter is ignited, the fire is transmitted to the transfer agent and reacts with the gas generating agent, generating an inert gas such as nitrogen gas or helium gas necessary for deployment of the airbag. ing. That is, gas generation and ejection are performed by explosive explosives (for example, see Japanese Unexamined Patent Application Publication No.
No. 98891, JP-A-7-156687 and JP-A-10-24797).

[0005]

However, in the above-mentioned conventional airbag apparatus, the generation and ejection of gas, that is, the deployment of the airbag is performed by explosion of the explosive, so
The gas emitted is a hot explosive gas, which is extremely dangerous to occupants. In addition, if gas discharged when the airbag contracts after being deployed enters the engine room, there is a risk of causing a fire, and furthermore, if the fire extends to the vehicle interior, there is a concern that occupants may be harmed.

Although the probability of protecting an occupant from a collision accident is certainly improved by the provision of the airbag device, the explosive gas is generated and ejected by the reaction of the gas generating agent. It is almost constant and cannot respond to changes in the weight of the occupant. For this reason,
For small infants, the gas supply is excessive, and the impact of the deployment of the airbag can cause whiplash, or even kill a person's life. On the other hand, for an occupant whose weight is much heavier than the standard, the gas supply amount tends to be insufficient, the deployment pressure of the airbag is weak, and the occupant is insufficiently supported, so that the occupant cannot be sufficiently protected.

Further, the gas generating agent may be deteriorated after a long period of time, and if the required gas amount and gas pressure cannot be obtained, the air bag function cannot be sufficiently exhibited.

[0008] The present invention has been made in view of the above points, and an object of the present invention is to provide an airbag device having a safe and stable airbag function without causing harm to an occupant. .

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an air bag that is deployed by using compressed gas instead of explosive gas, and supplies gas according to the weight of the occupant. It is characterized in that the amount can be controlled.

[0010] More specifically, the present invention is directed to an airbag device for a vehicle that receives an occupant's body and protects the occupant by deploying the airbag by an impact at the time of a vehicle collision, and takes the following solutions. Was.

That is, the invention according to claim 1 is a gas cylinder filled with a non-combustible compressed gas and whose injection port is sealed with a destructible destructible film, and a gas cylinder which operates at the time of vehicle collision to break through the destructive film and break through the destructive film. A film breaking means for ejecting the compressed gas in the air bag and supplying the gas into the air bag, and a gas supply amount for the air bag provided between the gas cylinder and the air bag so as to cover the ejection port to increase the weight of the occupant. A gas amount adjusting means for decreasing the weight of the occupant while decreasing the weight of the occupant. The bulging portion is provided with a gap that opens on both sides in the moving direction, and the bulging portion is retracted at normal times, and the bulging portion faces the breaking film at an interval. Hand, car At the time of collision, the advancing / retreating operation is performed, and in the advanced state, the bulging portion breaks through the destruction film, closes the gas cylinder outlet, and communicates with the inside and outside of the gas cylinder by the gap, and opens the gas outlet in the retracted state. It is characterized by the following.

[0012] With the above structure, in the first aspect of the present invention, the airbag is developed by the compressed gas which is ejected by destroying the destruction film that seals the outlet of the gas cylinder by the film destruction means. This compressed gas is safer than an explosive gas that is close to the temperature of the atmosphere and high in temperature, and has no danger to the occupants.

Further, the gas supply amount is appropriately controlled according to the weight of the occupant. That is, since the gas supply amount is reduced for an infant with a light weight, the infant is not whiplashed or lost his life due to the impact due to the deployment of the airbag. On the other hand, the occupant whose body weight is much heavier than the standard has a larger gas supply amount, so that the occupant is reliably supported and protected by a sufficient deployment pressure of the airbag.

Further, the amount and the gas pressure of the explosive gas change depending on the storage state of the gas generating agent. However, the compressed gas does not change over time and does not leak because it is sealed in a gas cylinder. And the gas pressure is always constant,
A sufficient airbag function can be stably obtained.

[0015] In addition, the compressed gas is in the initial stage of jetting.
Since a small amount of gas is blown out of the gap in a state where the gas is blown out at the bulging portion that closes the gas cylinder, the safety is secured as compared with the case where the gas is blown out from the gas cylinder at a stroke.

According to a second aspect of the present invention, in the first aspect, the gas amount adjusting means includes a fixed cylinder fixed to the gas cylinder, and a movable cylinder movably fitted to the fixed cylinder. A drive source for moving the movable cylinder, wherein each of the fixed cylinder and the movable cylinder is provided with a gas supply port communicating with an airbag, and a gas discharge port communicating with the outside of the apparatus, respectively. Connected to control means, the control means is connected to weight detection means for detecting the weight of the occupant, the control means outputs an operation signal to the drive source based on the input signal from the weight detection means Moving the movable cylinder to increase the opening area due to the overlap of the gas supply ports of the fixed cylinder and the movable cylinder with the increase in the weight of the occupant, while reducing the opening area due to the overlap of the two gas discharge ports, Crew Thereby reducing the opening area due to overlapping of both the gas supply port with the weight loss, characterized in that it is configured to increase the opening area due to overlapping of both gas outlet.

According to the second aspect of the present invention, the control of the gas supply amount in accordance with the weight of the occupant is achieved by controlling the opening area of the fixed cylinder and the movable cylinder by the overlap of the gas supply ports and the gas area. It is apparent that the change is performed by a change in the opening area due to the overlapping of the discharge ports.

According to a third aspect of the present invention, in the second aspect of the invention, the gas cylinder is provided with a gas pressure detecting means for detecting an internal gas pressure, and the gas pressure detecting means is provided to the control means. Connected, the control means outputs an operation signal to a drive source based on an input signal from the gas pressure detection means to move the movable cylinder, and when a detection value of the gas pressure detection means is less than a set value, In addition to increasing the opening area due to the overlap between the two gas supply ports and reducing the opening area due to the overlap between the two gas discharge ports, if the detected value exceeds the set value, the opening due to the overlap between the two gas supply ports is reduced. While reducing the area, increasing the opening area due to the overlap of the two gas outlets, the opening area due to the overlap of the two gas supply ports and the overlap of the two gas outlets adjusted by increasing or decreasing the body weight Characterized in that it is configured to correct the mouth area.

With the above arrangement, according to the third aspect of the present invention, the opening area due to the overlap between the gas supply ports of the fixed cylinder and the movable cylinder and the opening area due to the overlap between the two gas discharge ports are smaller than the gas pressure in the gas cylinder. The correction is made according to the value, and the supply and discharge of gas to and from the airbag are properly controlled, and the deployment operation of the airbag approaches an ideal.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an airbag apparatus according to one embodiment of the present invention. In the figure, the upper part is a simplified view in which the main part of the airbag device A is attached to the steering shaft C in front of the driver's seat F of the vehicle B and the airbag D is deployed, and the lower part is an enlarged internal configuration. It is sectional drawing. In this embodiment, a case is shown in which the airbag device A is a front airbag device that protects an occupant (driver) E from an impact from the front of the vehicle body. The present invention can also be applied to a side airbag device for protecting the occupant E when it is arranged or for protecting the occupant E from a side impact.

The air bag apparatus A includes a gas cylinder 1 filled with a noncombustible compressed gas made of an inert gas such as nitrogen gas or helium gas.
Is formed at the upper end thereof with a circular jet port 1a.
a is sealed with a breakable breaking film 2.

A gas amount adjusting device 3 as gas amount adjusting means is provided between the gas cylinder 1 and the airbag D so as to cover the jet port 1a. The gas amount adjusting device 3 includes an inner and outer double cylinder, of which an inner cylinder is a fixed cylinder 4 fixed to the gas cylinder 1 and a bottomed cylinder one of which is open, and the other outer cylinder. Is a movable cylinder 5 which is externally fitted to the fixed cylinder 4 so as to be rotatable in the circumferential direction, and has both ends opened.

As shown also in FIG. 2, a flange 4a is formed integrally with the periphery of the open end of the fixed cylinder 4, and the flange 4a is formed with its bottom surface facing upward (hereinafter, the bottom surface is referred to as the upper surface 4b).
a is welded to the periphery of the end of the gas cylinder 1 on the side of the jet port 1a. The flange 4a is provided with a projecting piece 4c protruding at one place. The projecting piece 4c is provided with a drive motor 6 as a drive source having an output shaft 6a extending upward, and the output shaft 6a is provided with a drive gear 7 Has been fixed.

On the other hand, a driven gear 8 is integrally provided in the middle of the outer peripheral surface of the movable cylinder 5 in the center line direction, and the driving gear 7 is connected to the driven gear 7 while the movable cylinder 5 is externally fitted to the fixed cylinder 4. The movable cylinder 5 is rotated around the fixed cylinder 4 by transmitting the rotational force of the driving motor 6 to the driven gear 8 via the driving gear 7 when the driving motor 6 is started.

Near the upper surface 4b of the peripheral surface of the fixed cylinder 4, four substantially square gas supply ports 9 are formed so as to divide the circumference into four equal parts, and the respective gas supply ports 9 are provided near the flange 4a. 9, a vertically long rectangular gas outlet 10
Are formed at four locations so as to divide the circumference into four equal parts. On the other hand, on the peripheral surface of the movable cylinder 5, four substantially square gas supply ports 11 are formed on the upper side of the driven gear 8 so as to divide the circumference into four parts. Below the gas supply ports 11 on the side, four vertically elongated gas discharge ports 12 are formed so as to divide the circumference into four equal parts. The airbag D is folded and attached so as to cover the movable cylinder 5 above the driven gear 8. A part thereof is shown by a virtual line in FIG. Therefore, both the gas supply ports 9, 1 of the fixed cylinder 4 and the movable cylinder 5 are provided.
1 is connected to the airbag D, and both gas outlets 10, 1
2 communicates outside the apparatus. The opening area of each of the gas supply ports 9 and 11 and the gas discharge ports 10 and 12 due to the overlap is adjusted to increase or decrease the amount of gas supplied to the airbag D as the weight of the occupant E increases. On the other hand, the weight is reduced as the weight of the occupant E decreases.

The drive motor 6 is provided with C
The controller 13 is connected to a controller 13 composed of a PU or the like. The controller 13 has a relation between the weight of the occupant E and the gas supply amount required for deploying the airbag D in accordance therewith. The relationship between each of the gas supply ports 9, 11 and the opening area due to the overlap of each of the gas discharge ports 10, 12 is stored in advance. The driver's seat F of the vehicle B is provided with a weight detecting sensor 14 as a weight detecting means including a load cell and a piezoelectric element for detecting the weight of the occupant E. The controller 13 includes the weight detecting sensor 1.
The controller 13 is connected to the controller 13. The occupant E enters the vehicle B and starts the engine by turning on an ignition key (not shown) to start the engine.
4 detection signals.

The controller 13 outputs an operation signal to the drive motor 6 based on an input signal from the weight detection sensor 14 to rotate the movable cylinder 5, and the controller 13 rotates the movable cylinder 5 as the weight of the occupant E increases. The opening area due to the overlap between the gas supply ports 9 and 11 of the fixed cylinder 4 and the movable cylinder 5 is increased, and the opening area due to the overlap between the gas discharge ports 10 and 12 is reduced. Thus, the opening area due to the overlap between the two gas supply ports 9 and 11 is reduced, and the opening area due to the overlap between the two gas discharge ports 10 and 12 is increased.

That is, the change in the opening area due to the overlap of the two gas supply ports 9 and 11 and the two gas discharge ports 10 and 12 is such that one becomes larger and the other becomes smaller due to the rotation of the movable cylinder 5. Accordingly, the gas supply amount to the airbag D is appropriately controlled according to the weight of the occupant E. The relationship is shown in FIGS.

FIG. 4A shows a case where the weight of the occupant E is light, and the upper gas supply ports 9 and 11 are largely displaced to the left and right so that the overlapping portion is small and the opening area o1 due to the overlapping is small. . On the other hand, both lower gas outlets 1
0 and 12 are entirely overlapped without shifting left and right, and the opening area o2 due to the overlap is maximized. This allows
The gas ejected from the gas outlet 1a of the gas cylinder 1 into the gas amount adjusting device 3 is suppressed at the small opening area o1 due to the overlap of the two gas supply ports 9, 11, and the supply amount to the airbag D is small and suppressed. Gas is both gas outlet 1
It is discharged out of the apparatus from a large opening area o2 due to the overlap of 0,12. In this case, the reason why the opening area o1 due to the overlap between the two gas supply ports 9 and 11 is not made zero is that the airbag D must be deployed regardless of how light the occupant E is.

FIG. 4B shows a case where the weight of the occupant E is medium, and the movable cylinder 5 rotates leftward from the state shown in FIG. 4A as indicated by an arrow. The shift of the supply ports 9 and 11 in the left and right directions is smaller than that in FIG. 4A, the overlapping portion is increased, and the opening area o3 due to the overlapping is increased. On the other hand, both lower gas outlets 10, 1
2 is shifted to the left and right, the overlapping portion is smaller than that in FIG. 4A, and the opening area o4 due to the overlapping is smaller. As a result, the gas ejected from the gas outlet 1a of the gas cylinder 1 into the gas amount adjusting device 3 is supplied to both the gas supply ports 9,1.
From the middle opening area o3 due to the overlap of
4A is supplied more than in FIG. Therefore, the amount of gas discharged from the opening area o4 due to the overlap of the two gas discharge ports 10 and 12 is smaller than that in FIG.

FIG. 4C shows a case where the weight of the occupant E is heavy, and the movable cylinder 5 is further rotated leftward as shown by the arrow from the state of FIG. Mouth 9,1
No. 1 overlaps without shifting to the left and right, and the opening area o5 due to the overlap is maximized. On the other hand, the lower gas discharge ports 10 and 12 are largely shifted left and right, and there is no overlapping portion, and the opening area due to the overlap is zero. As a result, the gas ejected from the gas outlet 1a of the gas cylinder 1 into the gas amount adjusting device 3 is supplied to both the gas supply ports 9,1.
Airbag D from large opening area o5 due to overlap of 1
Is supplied without being restrained to both gas outlets 10, 1
No emissions from 2

As described above, the airbag D, which is developed by adjusting the gas supply amount according to the weight of the occupant E, deploys the occupant E
After receiving the body of the occupant E, it is necessary to contract in order to absorb and reduce the impact on the occupant E when the occupant E is deployed. For this reason, it is necessary to quickly exhaust the gas inside after deployment. Therefore, after the airbag D is deployed, the gas amount adjusting device 3 is controlled by the controller 13 in FIG. 4 so as to maximize the opening area due to the overlap of the lower gas discharge ports 10 and 12.
The rotation is controlled to the state shown in FIG.

As described above, since the amount of gas supplied to the airbag D is increased or decreased according to the weight of the occupant E, the impact is weakened with a small deployment force for an infant with a light weight. While whiplash can be avoided and a precious human life can be saved, the occupant E with a heavy weight can be sufficiently received by the occupant E with a large deployment force, and can be protected from injury.

Further, since the gas for deploying the airbag D is a compressed gas sealed in the gas cylinder 1, there is no possibility of deterioration due to aging as in an explosive gas using a gas generating agent. There is no risk of leakage due to hermeticity, the required gas amount and gas pressure are always constant, and a sufficient airbag function can be stably obtained.

On the outer periphery of the gas cylinder 1, there is provided a gas pressure detecting means for detecting a change in resistance value due to a strain applied to the metal material of the gas cylinder 1 by gas pressure and indirectly detecting the gas pressure inside the cylinder. A strain gauge 15 is provided, and the strain gauge 15 is connected to the controller 13. This controller 13 includes:
The relationship between the gas pressure, the gas ejection amount, the opening area of each of the gas supply ports 9 and 11 and the gas discharge ports 10 and 12 of the fixed cylinder 4 and the movable cylinder 5 with respect to the reference set value is stored in advance. I have.

The controller 13 outputs an operation signal to the drive motor 6 based on the input signal from the strain gauge 15 to rotate the movable cylinder 5, and the detected value of the strain gauge 15 is less than the set value. In this case, while the opening area due to the overlap between the two gas supply ports 9 and 11 is increased and the opening area due to the overlap between the two gas discharge ports 10 and 12 is reduced, when the detected value exceeds the set value, The opening area due to the overlapping of the two gas supply ports 9 and 11 is reduced, and the two gas discharge ports 10 and 11 are reduced.
The opening area due to the overlap of the two gas supply ports 9 and 11 and the opening area due to the overlap between the two gas discharge ports 10 and 12 adjusted by increasing or decreasing the weight of the occupant E are corrected. It is configured.

As described above, the opening area due to the overlap of the two gas supply ports 9 and 11 and the two gas discharge ports 10 and 12 is determined from both the change in the weight of the occupant E and the change in the gas pressure. The supply and discharge of gas to D can be controlled appropriately, and the deployment operation of airbag D can be made closer to ideal.

The vehicle B is provided with an alarm lamp 16 as an alarm means for issuing an alarm when the gas pressure in the gas cylinder 1 is not within an allowable range.
6 is connected to the controller 13. And
The controller 13 is configured to output an alarm signal to an alarm lamp 16 when the detected value is not within an allowable range based on an input signal from the strain gauge 15.

As described above, the gas pressure in the gas cylinder 1 is monitored, and when the gas pressure is not within the allowable range, an alarm is issued from the alarm lamp 16, so that the person who uses the vehicle B such as the owner knows this. By replacing the airbag device A with a new one, it is possible to prepare for an accidental collision.

A film breaking jig 17 as a film breaking means is attached to the upper surface 4b of the fixed cylinder 4. As shown in FIG. 3, the film breaking jig 17 includes a cylindrical holder 18 fixed to the upper surface 4 b of the fixed cylinder 4. The rod 19 is supported so as to be able to move forward and backward.
The distal end (lower end) has a conical bulging portion 21 with a sharp distal end. The swelling portion 21 has an ejection groove 21 a formed of an outer peripheral groove as a gap that opens in the vertical direction on both sides in the reciprocating direction.
And four ejection holes 21b each formed of a through hole are formed every other one, and a flange 21c is formed on the outer periphery of the upper end. The bulging portion 21 of the advance / retreat rod 19 and the holder 18
, A coil spring 22 is interposed so as to surround the shaft portion 20.

The film breaking jig 17 does not operate in a normal state when the vehicle B does not collide, and the advancing / retracting rod 19 is pulled upward by the spring force of the coil spring 22 and retreats. And at a distance from the destruction film 2 (see FIG. 5A).

On the other hand, when the vehicle B collides, the film breaking jig 17 moves the reciprocating rod 19 to the coil spring 22.
Of the rupture film 2 in this advanced state and the flange 21c.
Is brought into contact with the peripheral edge of the jet port 1a, and the jet port 1 of the gas cylinder 1 is
a, and the inside and outside of the gas cylinder 1 are communicated with each of the ejection grooves 21a and each of the ejection holes 21b (FIG. 5).
(B)).

Thus, the compressed gas in the gas cylinder 1 is ejected in the initial stage of the ejection from the ejection port 1 of the gas cylinder 1.
The gas can be suppressed by the swelling portion 21 that closes the opening a. In this suppressed state, only a small amount is ejected from each of the ejection grooves 21a and each of the ejection holes 21b. Nature can be secured.

Further, the breaking film 2 for sealing the gas outlet 1a of the gas cylinder 1 is pierced by a film breaking jig 17, and the airbag D is deployed with a compressed gas which is close to the temperature of the atmosphere and safer than a high-temperature explosive gas. Therefore, harm to the occupant E can be eliminated.

In the next stage, the reciprocating rod 1
9 is retracted upward by the spring force of the coil spring 22 and retreats, and the bulging portion 21 returns to the state shown in FIG.
(C) and (d)). Thus, the suppression of gas ejection from the gas cylinder 1 is released, and the compressed gas in the gas cylinder 1 is ejected to deploy the airbag D.

The operation of the film breaking jig 17 is performed under the control of the controller 13. That is, the film breaking jig 17 is connected to the controller 13, and the controller 13 stores a reference deceleration at the time of a vehicle collision. On the other hand, the vehicle B is provided with a deceleration detection sensor 23 as deceleration detection means for detecting deceleration due to a vehicle collision.
3 is connected to the controller 13. And
The controller 13 is configured to output an operation signal to the film destruction jig 17 to operate the film destruction jig 17 when the detected value exceeds a set value based on an input signal from the deceleration detection sensor 23. ing. The operation mechanism of the film breaking jig 17 may be any of known electric means or mechanical means. Further, the deceleration detecting means may be of a type built in the holder 18 so as to directly operate the film breaking jig 17 in addition to the above, and in this case, it is not necessary to connect to the controller 13.

As a result, at the time of vehicle collision, the film breaking jig 17
Can be reliably operated to reliably deploy the airbag D, thereby ensuring the safety of the occupant.

FIGS. 6 and 7 show a modification of the above-described embodiment. In the above-described embodiment, the gas supply ports 9 and 11 formed in the fixed cylinder 4 and the movable cylinder 5 of the gas amount adjusting device 3 are different. The shape is square, and the shapes of the gas outlets 10 and 12 are vertically long rectangles. However, the present invention is not limited to this. While two ports 9 and two gas discharge ports 10 are formed at positions opposite to each other by 180 °, a horizontally long and tapered gas supply port 11 and one gas discharge port 12 are formed in the movable cylinder 5 as the outer cylinder.
The two openings may be formed at positions opposite to each other at an angle of 80 ° such that the widths of the left and right openings of the gas supply port 11 and the gas discharge port 12 are narrowly reversed. In this manner, similarly to the above embodiment, the occupant E can be safely protected by increasing or decreasing the amount of gas supplied to the airbag D according to the weight of the occupant E. .

FIG. 7 (a) shows the case where the weight of the occupant E is light. The opening area o1 due to the overlap of the upper gas supply ports 9 and 11 is smaller, while the lower gas supply ports 9 and 11 are smaller. The opening area o2 of the outlets 10 and 12 is maximized and corresponds to FIG. FIG. 7B shows a case where the weight of the occupant E is medium, and the movable cylinder 5 rotates rightward from the state shown in FIG. 7A as shown by the arrow. The opening area o3 due to the overlap of the, 11 is shown in FIG.
4A, the opening area o4 of the lower gas discharge ports 10, 12 is smaller than that of FIG. 4A, and corresponds to FIG. 4B. FIG. 7 (c) shows a case where the weight of the occupant E is heavy, and the movable cylinder 5 is further rotated to the right from the state of FIG. 7 (b) as indicated by the arrow. As a result, the upper gas supply ports 9, 11, the opening area o5 is maximized, whereas the lower gas discharge ports 10, 1
The opening area of No. 2 is zero, which corresponds to FIG.

In this embodiment, the strain gauge 15 is employed as the gas pressure detecting means. However, a gas pressure detecting sensor is separately provided inside the gas tank 1 so as to directly detect the internal gas pressure. You may.

The shape of the gas supply ports 9, 11 and the gas discharge ports 10, 12 is not limited to the above two examples as long as the opening area can be changed by overlapping each other. Can be done. Further, in the above two examples, the fixed cylinder 4 is arranged inside and the movable cylinder 5 is arranged outside, but conversely, the fixed cylinder 4 may be arranged outside and the movable cylinder 5 may be arranged inside. Further, in the above two examples, the movable cylinder 5 is rotated to change the opening area due to the overlap of the gas supply ports 9 and 11 and the gas discharge ports 10 and 12, but is moved in the vertical direction. Thus, the opening area due to the overlap may be changed.

[0053]

As described above, according to the present invention, the noncombustible compressed gas filled in the gas cylinder is jetted by piercing the destruction film, and the jetted compressed gas is supplied to the airbag to supply air. Since the bag is deployed, the occupant can be protected more safely than when the bag is deployed with hot explosive gas. Also, the compressed gas does not change over time as compared with the explosive gas using a gas generating agent, and is sealed in a gas cylinder so that it does not leak, so that the airbag function can be guaranteed with a stable gas amount and gas pressure. In addition, the amount of gas supplied to the airbag is increased as the weight of the occupant increases, while the gas supply is reduced as the weight of the occupant decreases. Can be reliably eliminated. Further, for an occupant whose weight is much heavier than the standard, the occupant can be reliably supported and protected by a sufficient deployment pressure of the airbag. In addition, in the initial stage of the ejection of the compressed gas, a small amount of the compressed gas is ejected from the gap opening to the swelling portion while the swelling portion of the advancing / retracting rod closing the ejection port of the gas cylinder squirts. Safety can be ensured as compared with a case where the gas is spouted at once.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an airbag device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a gas amount adjusting device in the airbag device according to one embodiment of the present invention.

FIG. 3 is an enlarged view of a film breaking jig in the airbag device according to one embodiment of the present invention.

FIG. 4 shows an operation state of the gas amount adjusting device in the airbag device according to one embodiment of the present invention, wherein (a) shows a case where the weight of the occupant is light, (b) shows a case where the weight of the occupant is medium,
(C) is a case where the weight of the occupant is heavy.

FIGS. 5A and 5B show the operation sequence of the film breaking jig in the airbag device according to one embodiment of the present invention, wherein FIG. 5A shows a state before the operation, FIG. (D) is a state immediately after piercing the rupture film, and is a state returned to the initial position after the operation.

FIG. 6 is an exploded perspective view showing a modification of the gas amount adjusting device.

FIG. 7 is a diagram corresponding to FIG. 4, showing an operation state of a modification of the gas amount adjusting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gas cylinder 1 a jet port 2 destruction film 3 gas amount adjustment device (gas amount adjustment means) 4 fixed cylinder 5 movable cylinder 6 drive motor (drive source) 9, 11 gas supply port 10, 12 gas exhaust port 13 controller (control means) Reference Signs List 14 weight detection sensor (weight detection means) 15 strain gauge (gas pressure detection means) 16 alarm lamp (warning means) 17 film breaking jig (film breaking means) 19 advance / retreat rod 20 shaft 21 bulge 21a ejection groove (gap) ) 21b ejection hole (gap) 23 deceleration detection sensor (deceleration detection means) A airbag device B vehicle D airbag E occupant o1 to o5 Opening area

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-186880 (JP, A) JP-A-55-25633 (JP, A) JP-A-11-99898 (JP, A) 21248 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (3)

(57) [Claims] 1. An airbag device for a vehicle, which receives an occupant's body and protects the occupant by deploying the airbag by an impact at the time of a vehicle collision, wherein the non-combustible compressed gas is filled with a destructible destructible film. A gas cylinder having an outlet sealed, a film breaking means which operates at the time of a vehicle collision, breaks through the destruction film, and jets out compressed gas in the gas cylinder to supply the gas into the airbag; and between the gas cylinder and the airbag. Gas amount adjusting means provided to cover the jet port and increasing the gas supply amount to the airbag with the increase in the weight of the occupant, while decreasing the gas supply amount with the weight of the occupant , the film breaking means includes: Provided to be able to advance and retreat to the destruction film
An advancing / retracting rod having a sharp bulging portion at the tip of the shaft portion, wherein the bulging portion is provided with a void that opens on both sides in the moving direction.
The retractable rod retreats in normal conditions and the bulge breaks.
While facing the membrane at an interval, it advances and retreats during a vehicle collision
Activated, when the bulging part breaks through the destruction film in the advanced state
The gas bottle is closed by closing the gas cylinder outlet.
Communicate between the inside and outside of the vessel and open the above-mentioned ejection port in the retracted state.
An airbag device for a vehicle, characterized in that: 2. The airbag device for a vehicle according to claim 1, wherein the gas amount adjusting means includes: a fixed cylinder fixed to the gas cylinder;
A movable cylinder fitted movably to the fixed cylinder, and a drive source for moving the movable cylinder; each of the fixed cylinder and the movable cylinder includes a gas supply port that communicates with an airbag; And a gas exhaust port through which the vehicle is connected, the drive source is connected to control means, and the control means is connected to weight detection means for detecting the weight of an occupant. The movable cylinder is moved by outputting an operation signal to the drive source based on the input signal of the above, and the opening area due to the overlap of the gas supply ports of the fixed cylinder and the movable cylinder with the increase in the weight of the occupant is increased, and While reducing the opening area due to the overlap of the two gas discharge ports, the opening area due to the overlap between the two gas supply ports is reduced along with the decrease in the weight of the occupant, and the opening area due to the overlap between the two gas discharge ports An airbag device for a vehicle, wherein the airbag device is configured to increase the size of the airbag. 3. The airbag device for a vehicle according to claim 2, wherein the gas cylinder is provided with gas pressure detecting means for detecting an internal gas pressure, wherein the gas pressure detecting means is connected to a control means, The control means outputs an operation signal to the drive source based on the input signal from the gas pressure detection means to move the movable cylinder,
If the detected value of the gas pressure detecting means is less than the set value,
While increasing the opening area due to the overlap of both gas supply ports and reducing the opening area due to the overlap of both gas discharge ports, if the detected value exceeds the set value, the opening area due to the overlap of both gas supply ports And to increase the opening area due to the overlap between the two gas outlets, to correct the opening area due to the overlap between the two gas supply ports and the opening area due to the overlap between the two gas outlets, which are adjusted by increasing or decreasing body weight. An airbag device for a vehicle, wherein the airbag device is configured.