JP2008075739A - Safety valve for vehicle safety device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety valve for a vehicle safety device, having simple construction for improving, under high-temperature environment, the safety of the vehicle safety device equipped with a gas generator. <P>SOLUTION: A hood lifting device as one of vehicle safety devices has an actuator for moving a piston 2 with the supply of gas from the micro gas generator 4 to a closed space 3 encircled by a cylinder 1 and the piston 2 so that a vehicle hood is lifted up by a piston rod 5 connected to the piston 2, wherein the safety valve 6 is formed in the cylinder 1 forming the closing space 3. The safety valve 6 comprises a through-hole 6a formed in the cylinder 1, and a sealing member 6a for blocking the through-hole 6a, the sealing member 6b being formed of a material having a lower melting point than the cylinder 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a safety valve of a vehicle safety device that supplies a gas of a gas generator to a predetermined closed space to perform a predetermined work.

  Gas generators (for example, inflators, micro gas generators, etc.) that are ignited under predetermined conditions and eject high-pressure gas are used in various situations. For example, in automobiles, they are used for vehicle safety devices such as actuators for hood lifting devices, actuators for pretensioners for seat belt devices, and airbag devices. Here, FIG. 7 is a layout diagram of gas generators in a passenger car. The gas generator 71 for the hood lifting device is arranged at the lower rear side of the bonnet. The gas generator for the air bag is arranged on the vehicle body so as to surround the occupant. 72a is used for the driver's seat front airbag, 72b is used for the front passenger seat airbag, 72c is used for the side airbag, and 72d is used for the curtain airbag. Is a gas generator. The gas generator 73 for the seat belt device is disposed in the vehicle body or the seat near the seat. Each gas generator is ignited when a vehicle collision is predicted or detected by an onboard ECU (electronic control unit), and supplies high-pressure gas to a predetermined closed space.

  Gas generators are classified into pyro (propellant) type, high pressure gas type, and hybrid type combining them, depending on the gas generation method. The pyro type receives a signal from the ECU, operates an igniter (ignition device), and burns the gas generating agent through the igniting agent to generate gas. The high-pressure gas type receives a signal from the ECU and operates an igniter (ignition device) to discharge the gas filled in the high-pressure vessel.

  The hood lifting device is one of vehicle safety devices provided to alleviate a secondary impact when a vehicle such as an automobile collides with a pedestrian. The hood lifting device has an actuator protruding by the high pressure gas of the hood lifting device gas generator 71. The hood lifting device receives a signal from the ECU, operates the actuator, and pushes up the hood hood from below. By lifting the bonnet hood in this way, a sufficient gap is secured between the engine and the hood, and the impact when a pedestrian collides with the hood is reduced.

  An airbag device is one of vehicle safety devices provided to restrain an occupant when a vehicle such as an automobile collides with an object. As described above, the airbag apparatus is disposed at various locations on the vehicle. Each airbag has a shape corresponding to the place where it is installed, but each gas generator 72a to 72d is activated in response to a signal from the ECU, and the airbag is instantly inflated by the generated high-pressure gas. In common.

  The seat belt device is one of vehicle safety devices provided for restraining an occupant in case a vehicle such as an automobile collides with an object. Recently, a device called a pretensioner is often connected to one end of the seat belt. The pretensioner has an actuator that is operated by the high-pressure gas of the gas generator 73 for the seat belt device. The seat belt device receives the signal from the ECU, operates the actuator, pulls in the seat belt instantaneously, and fixes the occupant to the seat, thereby enhancing the effect of the seat belt.

  When the gas generators mentioned above are exposed to a high temperature environment that exceeds the assumed operating temperature due to an unforeseen situation such as a fire, the igniter is activated regardless of the ECU signal, The gas generating agent may self-ignite. In addition, since the ambient temperature is higher than in normal operation, there is a possibility that high-temperature and high-pressure gas is discharged or the amount of gas discharged is higher than in normal operation. Further, the strength of the gas generator on the side receiving the high-pressure gas may be reduced. In particular, since the hood lifting device is disposed in the engine room, the stability and durability of the gas generator under a high temperature environment are required, and the self-ignition temperature tends to increase. In addition, when an aluminum material is adopted in the actuator connected to the gas generator in consideration of corrosion resistance and workability, there is a problem that strength and melting point at high temperature are lowered due to material characteristics. Therefore, when both are combined, it is necessary to consider the possibility that the above phenomenon occurs. Therefore, considering the case where an unexpected situation such as a fire occurs, it is necessary to further improve the safety of the vehicle safety device including the gas generator in a high temperature environment.

  Incidentally, gas generators that generate high-pressure gas are also employed in propulsion devices such as rocket motors. Such a gas generator has a gas outlet at one end of a main body containing a gas generating agent, and gas generated by ignition of the gas generating agent is jetted outward from the gas outlet. When such a rocket motor is exposed to a high-temperature gas due to an unexpected situation such as a fire, the gas generator may burn abnormally and lose its function as a propulsion device. As a method for preventing such abnormal combustion, the invention described in Patent Document 1 has been proposed.

In the invention described in Patent Document 1, a ring of a low melting point alloy is disposed on the opposite side to the gas outlet, and the gas generator body is supported by the ring. When the gas generator body is exposed to a high-temperature gas due to a fire or the like, the low melting point alloy ring melts and the gas generator body is moved to flow the abnormally burning gas to a flow other than the gas outlet. It is trying to discharge from the road.
JP 2000-27702 A

  However, the invention described in Patent Document 1 relates to a gas generator for a propulsion device, and the structure itself is different from the gas generator of a vehicle safety device that supplies high-pressure gas to a closed space. Cannot be applied to the gas generator of the vehicle safety device as it is. Further, if the invention described in Patent Document 1 is applied to a gas generator of a vehicle safety device, the device becomes complicated and large, and cannot be placed in a narrow space such as a vehicle body.

  The present invention was devised in view of the above-described problems, and provides a safety valve for a vehicle safety device for improving safety in a high temperature environment of a vehicle safety device including a gas generator with a simple structure. For the purpose.

  According to the present invention, there is provided a safety valve for a vehicle safety device for supplying a gas of a gas generator to a predetermined closed space to perform a predetermined work, and a penetration formed in a wall member forming a part of the closed space There is provided a safety valve for a vehicle safety device having a hole and a sealing member that closes the through hole, wherein the sealing member is made of a material having a melting point lower than that of the wall member. Is done.

  The through hole may have a portion whose diameter is increased toward the closed space, or may be formed in a portion to which the gas is sprayed. The sealing member may be formed of a material having a melting point lower than an external temperature when the inside of the gas generator reaches an ignition temperature when the gas generator is heated from the outside.

  For example, a hood lifting device, a pretensioner, a seat belt device, or an airbag device can be selected as the vehicle safety device.

  In the present invention, the vehicle safety device includes an actuator that moves the piston by supplying the gas into the cylinder, and the hood lifting device that lifts the hood of the vehicle by projecting the piston rod connected to the piston In this case, the wall member may be the cylinder or a connecting portion between the cylinder and the gas generator.

  Further, in the present invention, the vehicle safety device is a pretensioner that has an actuator that moves the piston by supplying the gas into the cylinder, and retracts the seat belt by drawing a wire connected to the piston. In addition, the wall member may be a connecting portion between the cylinder or the gas generator and the cylinder. Furthermore, the pretensioner having such a configuration may be installed in the seat belt device.

  Further, in the present invention, when the vehicle safety device is an airbag device that supplies and inflates the gas into an airbag, the wall member is connected to the connection portion between the gas generator and the airbag. There may be.

  According to the safety valve of the vehicle safety device of the present invention described above, the sealing member having a melting point lower than that of the wall member is disposed in a part of the wall member forming the closed space, so that gas can be used in an unexpected situation such as a fire. When the generator is exposed to an unexpected high temperature environment, the sealing member is melted before the wall member, and the closed space can be switched to the open space. Therefore, it is a case where the gas generator discharges gas at a higher temperature and pressure than during normal operation, the amount of gas discharged increases, or the strength of the gas generator receiving side decreases. However, the gas can be discharged into the open space, and the safety of the vehicle safety device in a high temperature environment can be further improved. Further, if the sealing member is formed of a material having a melting point lower than the external temperature when the inside of the gas generator reaches the ignition temperature when the gas generator is heated from the outside, the gas generator self-ignites. The closed space can be switched to the open space before.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a partial cross-sectional view of a first embodiment showing a hood lifting device according to the present invention, where (A) shows a normal state and (B) shows a state in an abnormal state. 2 is a view showing another embodiment of the safety valve, in which (A) is the second embodiment, (B) is the third embodiment, (C) is the fourth embodiment, and (D) is the fifth embodiment. An embodiment is shown.

  As shown in FIG. 1 (A), the hood lifting device of the present invention has an actuator that moves a piston 2 by supplying gas from a micro gas generator 4 to a closed space 3 surrounded by a cylinder 1 and a piston 2. A safety valve 6 is formed in a cylinder 1 that forms a closed space 3, which is one of vehicle safety devices that lifts a vehicle hood (not shown) by a piston rod 5 connected to the piston 2.

  The safety valve 6 includes a through hole 6a (see FIG. 1B) formed in the cylinder 1 and a sealing member 6b that closes the through hole 6a. The sealing member 6b has a melting point lower than that of the cylinder 1. It is made of material. Since the cylinder 1 of the hood lifting device is disposed in the engine room, corrosion resistance is required, and an aluminum material may be employed. For example, in the case of an aluminum material having a melting point of around 660 degrees, as the material of the sealing member 6b, zinc (melting point: about 420 degrees), bismuth (melting point: about 270 degrees), tin (melting point: about 230 degrees), A metal such as indium (melting point: about 150 degrees) or an alloy thereof can be used. As the resin, nylon (melting point: about 200 degrees), polypropylene (PP, melting point: about 180 degrees), polybutylene terephthalate (PBT, melting point: about 220 degrees), and the like can be used. When the cylinder 1 is formed of a steel material having a melting point exceeding 1000 degrees, silver (melting point: about 960 degrees) or an alloy thereof can be selected in addition to the metal, alloy, and resin described above.

  Further, the sealing member 6b may be formed of a material having a melting point lower than the external temperature when the inside of the micro gas generator 4 reaches the ignition temperature when the micro gas generator 4 is heated from the outside. In such a case, the sealing member 6b can be melted before the igniter of the micro gas generator 4 or the gas generating agent self-ignites. When the micro gas generator 4 is exposed to a high-temperature environment so as to self-ignite, the micro gas generator 4 discharges gas at a higher temperature and pressure than usual, or the amount of gas discharged increases. Although the strength of 1 may be reduced, the closed space 3 can be switched to an open space by melting the sealing member 6b even in such an abnormal time, and the high temperature environment of the hood lifting device The safety under can be further increased.

  For example, when the ignition temperature of the micro gas generator 4 is T1, the melting point of the cylinder 1 is T2, the melting point of the sealing member 6b is T3, and the external temperature of the micro gas generator 4 and the cylinder 1 is T4, at least T3 <T2 Need to be. This is because if the sealing member 6b is not melted before the cylinder 1 is melted, it does not function as a safety valve. The ignition temperature T1 of the micro gas generator 4 is generally 150 to 300 degrees. When the inside of the micro gas generator 4 is heated to such a temperature, the external temperature T4 is assumed to be several tens to several hundreds of degrees higher than the ignition temperature T1. When the external temperature T4 is thus high, there is a high probability that an unexpected situation such as a fire has occurred, and there is also a high probability that the micro gas generator 4 will not operate in the same way as during normal operation. Therefore, by forming the sealing member 6b with a material having a melting point T3 lower than the external temperature T4, which is several tens to several hundreds of degrees higher than the ignition temperature T1, the closed space before the micro gas generator 4 self-ignites. Can be switched to an open space. The sealing member 6b is also exposed to gas ejected from the micro gas generator 4 during normal operation of the micro gas generator 4. However, since the exposure time is short, the gas ejected from the micro gas generator 4 is Even when the temperature is high, the sealing member 6b is not melted and the closed space 3 becomes an open space.

  Moreover, the through-hole 6a is formed in the shape where the inner diameter was expanded so that the opening area by the side of the closed space 3 was large, and the opening area of the outer side was narrowed. And the sealing member 6b is formed in the shape which seals the through-hole 6a. Accordingly, a step portion is formed in the through hole 6a, and the sealing member 6b is locked to the step portion. The reason why the sealing member 6b is locked in this way is to prevent the sealing member 6b from being removed by the gas ejected from the micro gas generator 4.

  The shape of the safety valve 6 is not limited to that shown in FIG. 1, and various shapes can be adopted as shown in FIG. In the second embodiment shown in FIG. 2A, the through hole 6a has a shape that does not have an enlarged diameter portion, and the sealing member 6b is formed in a shape in which a flange portion is formed on the closed space 3 side. Yes. In the third embodiment shown in FIG. 2 (B), the through-hole 6a has a shape having a portion (tapered portion) whose diameter is gradually expanded toward the closed space 3, and the sealing member 6b has a shape for sealing the through-hole 6a. Is formed. In the fourth embodiment shown in FIG. 2C, the through hole 6a has a shape having a partially enlarged diameter, and the sealing member 6b is formed in a shape for sealing the through hole 6a. In the first to fourth embodiments, the sealing member 6b may be formed as a separate part and assembled to the through hole 6a, or may be attached by a method such as insert molding. Moreover, it can also attach like 5th Embodiment shown in FIG.2 (D). In the fifth embodiment, the through-hole 6a is formed in the straight portion of the cylinder 1, the rivet-shaped sealing member 6b is assembled to the through-hole 6a, and the portion protruding outward (the broken-line portion) is deformed to deform the through-hole 6a. Is sealed. At this time, when the sealing member 6b is a metal, it is caulked, and when it is a resin, a portion protruding outward by welding (broken line portion) may be deformed. Of course, in the first to fourth embodiments, the through-hole 6a may be formed in the straight portion of the cylinder 1.

  In the above-described first to fourth embodiments, the safety valve 6 is formed so that the through-hole 6a is directed to the portion to which the gas supplied from the micro gas generator 4 is sprayed in the gas supply direction. By forming the safety valve 6 at this position, when the safety valve 6 functions (when the sealing member 6b is melted), as shown by the arrow in FIG. be able to. The through hole 6a does not need to be formed at the illustrated position, and can function as the safety valve 6 regardless of the portion of the cylinder 1 that forms the closed space 3. Of course you can.

  Here, the structure of the hood lifting device will be briefly described with reference to FIG. A body upper 7 is screwed to the tip of the cylinder 1. The body upper 7 slidably supports the piston rod 5 and closes the tip of the cylinder 1. A recess is formed at the tip of the body upper 7, and a plurality of fastener pins 8 are provided in the recess. On the other hand, a cap 9 is screwed onto the tip of the piston rod 5. The cap 9 can be stored in the recess of the body upper 7 and can be locked by the fastener pin 8. Further, a portion of the piston rod 5 near the piston 2 is formed with an enlarged diameter portion (stopper 10) for contacting the body upper 7 to stop the movement of the piston rod 5. The stopper 10 has a tapered surface with a reduced diameter on the piston 2 side. A plurality of balls 11 are inserted between the tapered surface of the stopper 10 and the piston 2. The ball 11 is sandwiched between the tapered surface of the stopper 10 and the inner surface of the cylinder 1 when the piston rod 5 is moved in the contracting direction (retracting direction), and the position is fixed so that the piston rod 5 does not move. It has the function to do. The cap 9 and the body upper 7 are covered with a rubber upper cover 12 to be waterproof.

  When a collision detection sensor installed in the vehicle detects or predicts a collision, the micro gas generator 4 is ignited by a signal from an ECU (electronic control unit), and the hood lifting device is activated. When gas is supplied from the micro gas generator 4 into the closed space 3 and the gas pressure in the cylinder 1 reaches a certain level or higher, the cap 9 shears the fastener pin 8, and the cap 9 and the piston rod 5 move the upper cover 12. It breaks out and protrudes outward. As the piston rod 5 moves, the cap 9 contacts the lower part of the hood of the vehicle and pushes up the hood. When the piston rod 5 is moved by the length of the piston rod 5, the stopper 10 comes into contact with the body upper 7, and the piston rod 5 stops and is locked by the ball 11. The structure of the hood lifting device shown in FIG. 1 is an example, and is not limited to the illustrated structure.

  Next, the pretensioner according to the present invention will be described with reference to FIG. 3A and 3B are partial cross-sectional views of the pretensioner according to the present invention, in which FIG. 3A shows a normal state and FIG. 3B shows an abnormal state.

  As shown in FIG. 3A, the pretensioner of the present invention has an actuator that moves the piston 32 by supplying gas from the micro gas generator 34 to the closed space 33 surrounded by the cylinder 31 and the piston 32. A safety valve 37 is formed at a connecting portion 36, which is one of vehicle safety devices that draws a seat belt (not shown) by a wire 35 connected to a piston 32. The connecting portion 36 connects the micro gas generator 34 and the cylinder 31 in a sealed state to form a closed space 33. The wire 35 is wound around a belt reel 38 and accommodated in a casing 39.

  The safety valve 37 is the same as the safety valve 6 of the hood lifting device shown in FIG. By installing such a safety valve 37 in the pretensioner, even when the pretensioner is exposed to a high temperature environment in an unexpected situation such as a fire, as shown in FIG. By melting, the closed space 33 can be switched to an open space. Therefore, even when the micro gas generator 34 does not operate in the same manner as during normal operation, gas can be discharged from the through hole 37a to the open space, and the safety of the pretensioner in a high temperature environment can be further increased. Can be increased.

  Next, the seat belt device according to the present invention will be described with reference to FIG. FIG. 4 is an external view of the seat belt device according to the present invention.

  The seat belt device according to the present invention is one of vehicle safety devices including a pretensioner 42 that pulls in the seat belt 41 when a collision between a vehicle and an object is detected or predicted. The pretensioner shown is adopted. Therefore, even when the seat belt device is exposed to a high temperature environment due to an unexpected situation such as a fire, the sealing member of the pretensioner 42 is melted and the closed space can be switched to an open space (see FIG. 3 (B)), the safety of the seat belt device in a high temperature environment can be further improved.

  As shown in FIG. 4, the seat belt device of the present invention includes a seat belt 41 that restrains an occupant, a pretensioner 42 that retracts the seat belt 41 when a collision between a vehicle and an object is detected or predicted, and a seat belt 41. A seat belt retractor 43 that winds up the seat belt 41, a tongue 44 that is slidably supported by the seat belt 41, and a buckle 45 that can be engaged with the tongue 44. The pretensioner 42 is installed on the seat belt retractor 43. The seat belt 41 is looped around a guide anchor 46 fixed to a vehicle body (not shown), and the tip is connected to the vehicle body or the vehicle seat 48 by a belt anchor 47. The details of the pretensioner 42 are the same as those already described with reference to FIG. 3 and the description thereof, and a duplicate description is omitted here.

  Next, the airbag apparatus according to the present invention will be described with reference to FIGS. FIG. 5 is a partial cross-sectional view showing a safety valve of a front airbag for a driver's seat, where (A) shows a normal state and (B) shows a state in an abnormal state. FIG. 6 is a view showing a safety valve of a curtain airbag, in which (A) is an external view and (B) is a configuration diagram of the safety valve.

  As shown in FIG. 5A, the driver's seat front airbag device is one of vehicle safety devices that inflates by supplying gas from the inflator 52 into the airbag 51, and supports the inflator 52. A safety valve 54 is formed in a casing 53 connected to the airbag 51. That is, the casing 53 is a connecting portion that connects the airbag 51 and the inflator 52. Therefore, a closed space 55 is formed by the airbag 51 and the casing 53. In addition, safety valves 54 are formed at two locations on the casing 53 in order to efficiently extract gas from the inflator 52 from the closed space 55. Of course, safety valves 54 may be arranged at three or more locations on the outer periphery of the inflator 52 in order to evenly outgas. Here, the inflator 52 is a disc type.

  The safety valve 54 is the same as the safety valve 6 of the hood lifting device shown in FIG. By installing such a safety valve 54 in the airbag device, even if the airbag device is exposed to a high temperature environment in an unexpected situation such as a fire, as shown in FIG. 54b melts and the closed space 55 can be switched to an open space. Therefore, even when the inflator 52 is in an abnormal state where it does not operate in the same manner as during normal operation, gas can be discharged from the through hole 54a to the open space, and the safety of the airbag device in a high temperature environment is further increased. be able to.

  There are various other airbag devices such as a front airbag for a passenger seat, a side airbag, a curtain airbag, a knee airbag, a rear seat airbag, and the like. 54 is applicable to all airbag apparatuses. The inflator 52 is not limited to a disk type but can be applied to a cylinder type. Here, as an example, a curtain airbag will be described with reference to FIG.

  As shown in FIG. 6A, the curtain airbag device is one of vehicle safety devices that inflates by supplying gas from the inflator 62 into the airbag 61, and the inflator 62 and the airbag 61 are sealed. The safety valve 64 is formed in the cylindrical connection part 63 connected to the state. That is, a closed space is formed by the airbag 61 and the connecting portion 63. The inflator 62 is a cylinder type.

  Next, the configuration of the safety valve 64 will be described with reference to FIG. The safety valve 64 includes a plurality of through holes 64 a formed over the entire circumference of the connecting portion 63, and a cylindrical sealing member 64 b that is inserted into the connecting portion 63. The through hole 64a can be closed by bringing the sealing member 64b into close contact with the connecting portion 63 without a gap. The connecting portion 63 can be formed by, for example, a punching metal, a lath, a wire mesh, or the like. Moreover, in order to fix the position of the sealing member 64b, a level | step difference may be formed in the inner surface of the connection part 63, or a support member may be inserted from both ends. Since this safety valve 64 is basically the same as the safety valve 6 of the hood lifting device in other points, a duplicate description is omitted. Although the positional relationship between the connecting member 63 and the sealing member 64b may be reversed inside and outside, the positional relationship in the illustrated state is preferable from the viewpoint of strength.

  The present invention is not limited to the above-described embodiment, and the gas generator (inflator, micro gas generator, etc.) may be any of a pyro (propellant) type, a high pressure gas type, and a hybrid type that combines them. Of course, the safety device is not limited to those shown in the embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a fragmentary sectional view of 1st Embodiment which shows the hood lifting apparatus which concerns on this invention, (A) is normal time, (B) has shown the state at the time of abnormality. It is a figure which shows other embodiment of a safety valve, (A) is 2nd Embodiment, (B) is 3rd Embodiment, (C) has shown 4th Embodiment. It is a fragmentary sectional view of the pretensioner concerning the present invention, (A) shows the state at the time of usual, and (B) shows the state at the time of abnormality. 1 is an external view showing a seat belt device according to the present invention. It is a fragmentary sectional view showing a safety valve of a driver's seat front airbag, (A) shows a normal state, and (B) shows a state in an abnormal state. It is a figure which shows the safety valve of a curtain airbag, (A) is an external view, (B) is a block diagram of a safety valve. It is an arrangement plan of a gas generator in a passenger car.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Closed space 4 Micro gas generator 5 Piston rod 6 Safety valve 6a Through hole 6b Sealing member 7 Body upper 8 Fastener pin 9 Cap 10 Stopper 11 Ball 12 Upper cover 31 Cylinder 32 Piston 33 Closed space 34 Micro gas generator 35 Wire 36 Connecting portion 37 Safety valve 37a Through hole 37b Sealing member 38 Belt reel 39 Casing 41 Seat belt 42 Pretensioner 43 Seat belt retractor 44 Tongue 45 Buckle 46 Guide anchor 47 Belt anchor 48 Vehicle seat 51 Air bag 52 Inflator 53 Casing 54 Safety valve 54a Through hole 54b Sealing member 55 Closed space 61 Air bag 62 Inflator 63 Connection portion 64 Safety valve 64a Through hole 6 4b Sealing member 71 Gas generator 72a for hood lifting device Gas generator 72b for driver's seat front airbag Gas generator 72c for passenger seat front airbag Gas generator 72d for side airbags Gas generator 73 for curtain airbags Seat Gas generator for belt device

Claims (9)

  A safety valve of a vehicle safety device for supplying a gas of a gas generator to a predetermined closed space to perform a predetermined work, a through hole formed in a wall member forming a part of the closed space, and the through hole A sealing member for closing the vehicle, wherein the sealing member is made of a material having a melting point lower than that of the wall member.   The safety valve for a vehicle safety device according to claim 1, wherein the through hole has a portion whose diameter is increased toward the closed space.   The safety valve of the vehicle safety device according to claim 1 or 2, wherein the through hole is formed in a portion to which the gas is sprayed.   The sealing member is formed of a material having a melting point lower than an external temperature when the inside of the gas generator reaches an ignition temperature when the gas generator is heated from the outside. A safety valve for a vehicle safety device according to any one of claims 1 to 3.   The safety valve for a vehicle safety device according to any one of claims 1 to 4, wherein the vehicle safety device is a hood lifting device, a pretensioner, a seat belt device, or an airbag device.   The vehicle safety device is a hood lifting device that has an actuator that moves the piston by supplying the gas into the cylinder, and that lifts the hood of the vehicle by protruding a piston rod connected to the piston, and the wall member 5 is a connecting portion between the cylinder or the cylinder and the gas generator, The safety valve for a vehicle safety device according to any one of claims 1 to 4.   The vehicle safety device includes an actuator that moves the piston by supplying the gas into the cylinder, and is a pretensioner that retracts a wire connected to the piston and winds up a seat belt, and the wall member includes The safety valve for a vehicle safety device according to any one of claims 1 to 4, wherein the safety valve is a cylinder or a connecting portion between the gas generator and the cylinder.   A safety valve for a vehicle safety device, wherein the vehicle safety device is a seat belt device including the pretensioner according to claim 7. The vehicle safety device is an airbag device that supplies and inflates the gas into an airbag, and the wall member is a connecting portion between the gas generator and the airbag. A safety valve for a vehicle safety device according to any one of claims 1 to 4.