JP2009063010A - Gas pressure actuator - Google Patents

Abstract

In an explosive actuator using a high-pressure gas generated by combustion of explosive as a driving source, the operation performance of the explosive actuator is improved without increasing the weight as much as possible.
A cylinder chamber (6) of an explosive actuator (1) is divided into a high pressure chamber (6a) facing a gas generator (3) and a decompression chamber (6b) facing a piston head (2b). A partition wall (8) is provided, and a communication hole (9) for communicating the high pressure chamber (6a) and the decompression chamber (6b) is formed in the partition wall (8).
[Selection] Figure 3

Description

  The present invention relates to a gas pressure actuator that is driven by a high-pressure gas generated by a reaction of a gas generating agent.

  2. Description of the Related Art Conventionally, a gas pressure type actuator that applies a force to an object using a jet pressure of a high pressure gas generated by a reaction of a gas generating agent is known. Patent Document 1 describes an explosive actuator that uses explosives as a gas generating agent and applies a force to an object using the jet output of high-pressure gas generated by the combustion of the explosive.

  For example, when a pedestrian collides with an automobile, the explosive actuator forcibly lifts an engine hood provided in an openable and closable manner above the engine room of the automobile so that a secondary collision of the pedestrian, that is, a pedestrian. Is used as a safety device to alleviate the strong hitting of the engine block via the engine hood.

  FIG. 8 shows a longitudinal sectional view of a conventional explosive actuator. The explosive actuator (31) includes a cylinder (35), a piston head (32b) capable of moving back and forth in the cylinder (35), and a piston rod (32a) connected to the piston head (32b). (32). A cylinder chamber (36) defined by the cylinder (35) and the piston head (32b) is formed in the cylinder (35). And the gas generator (33) which ejects high pressure gas with combustion of a gunpowder is being fixed to the bottom wall (37) of the said cylinder (35).

  The gas generator (33) includes an explosive, a rupturable airtight container for containing the explosive, and an ignition mechanism (not shown) for igniting the explosive accommodated in the airtight container. When an ignition operation is performed by the ignition mechanism, the explosive in the sealed container is burned to generate high-pressure gas. Then, the high-pressure gas is filled in the sealed container, and the pressure in the sealed container increases. When the pressure in the sealed container rises and exceeds a predetermined value, the sealed container bursts and high-pressure gas is ejected into the cylinder chamber (36). The jetted high-pressure gas increases the pressure in the cylinder chamber (36) and pushes the piston (32) out of the cylinder (35) (upward in FIG. 8). Thereby, it is comprised so that the press part (32c) provided in the front-end | tip part of piston (32) may contact an engine hood, and this engine hood may be lifted.

Here, in the gas generator (33), by using the airtight container, it is possible to burn the explosive in a higher pressure state than when the airtight container is not used. In this way, by burning the explosive in a high pressure state, the combustion is promoted to increase the force for pushing the piston (32) out of the cylinder (35), and the explosive actuator (31) The operating performance is improved.
Japanese Patent Laid-Open No. 2004-330913

  However, in order to further improve the operating performance of the explosive actuator, the explosive residue (hereinafter referred to as residue) is reduced by increasing the strength of the closed container and burning the explosive at a higher pressure. Although it is necessary to realize an efficient combustion state, there is a limit to increasing the strength of this sealed container. In addition, when explosives are burned at a higher pressure than before, high pressure gas with a higher pressure is jetted into the cylinder chamber, so that the pressure in the cylinder chamber increases rapidly. Therefore, the explosive actuator must be strong enough to withstand sudden pressure increases.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a gas pressure type actuator using a high pressure gas generated by a reaction of a gas generating agent as a drive source without increasing the weight as much as possible. The purpose of this is to improve the operating performance.

  The first invention includes a cylinder (5), a piston (2) having a piston head (2b) and a piston rod (2a) capable of moving back and forth in the cylinder (5), the cylinder (5) and the piston head. It is assumed that the gas pressure actuator is provided with a gas generator (3) that ejects high-pressure gas in response to the reaction of the gas generating agent in the cylinder chamber (6) defined by (2b).

  A partition wall (8) that divides the cylinder chamber (6) of the gas pressure actuator into a first chamber (6a) containing the gas generating agent and a second chamber (6b) separated from the gas generating agent. The partition wall (8) is provided with a communication hole (9) for communicating the first chamber (6a) and the second chamber (6b).

  In the first invention, the first chamber (6a) and the second chamber (6b) can be partitioned by providing the cylinder chamber (6) with the partition wall (8). And the high pressure area | region which can react the gas generating agent of the said gas generator (3) with a high pressure, ie, a high pressure chamber, can be formed by partitioning and forming the 1st chamber (6a). Thereby, the reaction of the gas generating agent can be performed more efficiently than before, and the residue of the gas generating agent due to insufficient reaction can be suppressed.

  The high pressure gas in the first chamber (6a) is reduced in pressure when passing through the communication hole (9) and flows to the second chamber (6b). By partitioning the second chamber (6b), it is possible to form a decompression region, that is, a decompression chamber, in which the piston (2) operates under a lower pressure than the first chamber (6a).

2nd invention has the obstruction | occlusion member (9a) which plugs up the said communicating hole (9) in 1st invention,
The closing member (9a) opens the communication hole (9) when the first chamber (6a) becomes a predetermined pressure or higher by the high pressure gas ejected from the gas generator (3). It is characterized by being configured.

  In the second invention, the high pressure gas passes through the communication hole (9) until the first chamber (6a) reaches a predetermined pressure or higher and the closing member (9a) opens the communication hole (9). It can be prevented from passing. Therefore, the pressure in the first chamber (6a) can be prevented from decreasing until the closing member (9a) opens the communication hole (9).

  According to a third invention, in the first or second invention, the partition wall (8) is provided on an inner surface of the cylinder chamber (6).

  According to a fourth invention, in the first or second invention, the partition wall (8) is provided on an end face of the gas generator (3) so as to be located inside the cylinder chamber (6). It is characterized by.

  In the third and fourth inventions, by providing the partition wall (8) on the inner surface of the cylinder chamber (6) or the end surface of the gas generator (3), the cylinder chamber (6) is securely connected to the first chamber ( It can be divided into 6a) and a second chamber (6b).

  According to a fifth invention, in any one of the first to fourth inventions, the piston rod (2a) is slidably held by being attached to an end of the cylinder (5) and the piston head (2b). ) Is provided with a bush (4) used as a stopper.

  In the fifth invention, since the pressure in the second chamber (6b) is lower than the pressure in the first chamber (6a), the force pushing the piston (2) is also reduced, and the movement of the piston (2) is slow. become. Therefore, the strength of the bush (4) used as a stopper for the piston (2) can be lowered.

  According to a sixth invention, in any one of the first to fifth inventions, the cylinder (5) is formed of an upper body (5a) and a lower body (5b) connected to the upper body (5a). The partition wall (8) is provided between the upper body (5a) and the lower body (5b). The lower body (5b) includes the first chamber (6a) and the gas generator (3 ) And is provided.

  In the sixth invention, a high pressure of high pressure gas can be applied only to the lower body (5b). Therefore, the strength of the upper body (5a) can be lower than that of the lower body (5b).

  According to a seventh invention, in the sixth invention, the upper body (5a) and the lower body (5b) are formed of different materials, and the upper body (5a) is lower in strength than the lower body (5b). It is made of a material.

  In the seventh invention, since the high pressure of high pressure gas is applied only to the lower body (5b) in the cylinder (5), the material of the upper body (5a) is different from that of the lower body (5b). Can be formed of a low material. For example, the lower body (5b) may be formed of iron, and the upper body (5a) may be formed of aluminum or resin.

  According to the present invention, the gas generating agent can be reacted at a high pressure by defining the first chamber (6a) in the cylinder chamber (6). Therefore, the reaction of the gas generating agent is efficiently performed, and the operation performance of the gas pressure actuator (1) is improved. In addition, since the reaction of the gas generating agent is performed efficiently, it is not necessary to design the gas pressure actuator (1) in consideration of the residue of the gas generating agent, and the amount of the gas generating agent can be reduced compared to the conventional case. The gas pressure actuator (1) can be reduced in size and weight.

  Even if the gas generating agent is reacted at a high pressure in the first chamber (6a), the gas generating agent in the first chamber (6a) is activated in the second chamber (6b) in which the piston (2) operates. It is possible to suppress an abrupt increase in pressure associated with the reaction. Therefore, the strength of the second chamber (6b) can be lower than that of the first chamber (6a). Thereby, size reduction and weight reduction of the said 2nd chamber (6b) can be performed.

  As described above, in the gas pressure actuator (1), the operating performance of the gas pressure actuator can be improved without increasing the weight as much as possible.

  According to the second invention, by providing the closing member (9a), the pressure in the first chamber (6a) decreases until the closing member (9a) opens the communication hole (9). You can avoid it. That is, as long as the pressure in the first chamber (6a) does not decrease, the time during which the reaction of the gas generating agent is efficiently performed can be made longer than in the case where the closing member (9a) is not provided. Therefore, the reaction of the gas generating agent can be performed reliably and efficiently, and it is not necessary to design the gas pressure actuator (1) in consideration of the residue of the gas generating agent, and the gas pressure actuator (1) can be reliably Can be reduced in size and weight.

  According to the third and fourth inventions, the partition wall (8) is provided on the inner surface of the cylinder chamber (6) or the end surface of the gas generator (3), so that the cylinder chamber (6) is connected to the first chamber ( 6a) and the second chamber (6b) can be reliably partitioned. Therefore, in the first chamber (6a), the reaction of the gas generating agent can be performed reliably and efficiently, and it is not necessary to design the gas pressure actuator (1) in consideration of the residue of the gas generating agent. The gas pressure actuator (1) can be reliably reduced in size and weight. Further, in the second chamber (6b), the sudden pressure increase caused by the sudden pressure increase in the first chamber (6a) can be reliably suppressed, and the strength of the second chamber (6b) is increased to the first level. Can be lower than the chamber (6a). Thereby, size reduction and weight reduction of the said 2nd chamber (6b) can be performed still more reliably.

  According to the fifth invention, since the pressure in the second chamber (6b) is lower than the pressure in the first chamber (6a), the force pushing the piston (2) is also reduced, and the movement of the piston (2) Becomes moderate. Therefore, the strength of the bush (4) used as a stopper for the piston (2) can be reduced, and the bush (4) can be reduced in size and weight.

  According to the sixth aspect of the invention, since the high pressure gas can be applied only to the lower body (5b), the strength of the upper body (5a) can be lowered than that of the lower body (5b). . Therefore, the upper body (5a) can be reduced in size and weight.

  According to the seventh invention, the upper body (5a) can be formed of a material that is different from the lower body (5b) and has a low strength. For example, the lower body (5b) may be formed of iron, and the upper body (5a) may be formed of aluminum or resin. By comprising in this way, compared with the case where the said upper body (5a) and the lower body (5b) are formed with the same material, size reduction and weight reduction can be performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The explosive actuator (gas pressure actuator) (1) of the present embodiment constitutes an element device of the safety device (13) mounted on the automobile (10) as shown in FIG. The safety device (13) is used to alleviate the secondary collision of a pedestrian that has collided with the front end of the automobile (10), that is, the pedestrian strongly hitting the engine block via the engine hood (11). Is.

  Specifically, the safety device (13) includes a collision detection sensor (20), a controller (30), and the explosive actuator (1) connected by electrical wiring. The collision detection sensor (20) is provided at the front end of the automobile (10), and outputs a collision detection signal to the controller (30) when it detects a pedestrian collision with the front end. Further, the controller (30) is provided in the engine room (12) of the automobile (10), and when a collision detection signal is inputted from the collision detection sensor (20), the operation signal is immediately sent to the explosive type. Output to the actuator (1).

  The explosive actuator (1) is provided below an engine hood (11) that can be opened and closed above an engine room (12) of an automobile (10), and an operation signal is received from the controller (30). When input, as shown in FIG. 2, the engine hood (11) is forcibly lifted. In this way, even if a pedestrian collides with the automobile (10), it is possible to alleviate the strong hitting of the hard engine block under the engine hood (11). Hereinafter, the explosive actuator (1) will be described in detail.

  As shown in FIG. 3, the explosive actuator (1) is divided into a cylinder (5), a piston (2) provided in the cylinder (5), and the cylinder (5) and the piston (2). A formed cylinder chamber (6) and a gas generator (3) provided penetrating the bottom wall (7) of the cylinder (5) are provided.

  The cylinder (5) is formed in a cylindrical shape, and an upper end portion is opened and a lower end portion is closed. A bush (4) is attached to the opening at the upper end. The bush (4) is formed with a bush hole penetrating in the length direction. The bush (4) constitutes a stopper for preventing the piston (2) from falling out of the cylinder (5) when the piston (2) advances and retreats in the cylinder (5).

  The piston (2) was connected to a piston rod (2a) formed in a cylindrical shape having a smaller diameter than the inner diameter of the cylinder (5), and a lower end (lower side in FIG. 3) of the piston rod (2a). A piston head (2b) and a pressing portion (2c) connected to the upper end (upper side in FIG. 3) of the piston rod (2a) are configured. Here, the piston head (2b) and the pressing portion (2c) are formed in a flat columnar shape, and the outer peripheral surface of the piston head (2b) slides on the inner peripheral surface of the cylinder (5). It is configured to touch.

  The piston head (2b) is located inside the cylinder (5), and the pressing portion (2c) is located outside. When the piston rod (2a) is inserted into the bush hole and is slidably supported, the piston (2) is configured to be able to advance and retract relative to the cylinder (5).

  The cylinder chamber (6) is formed so as to be surrounded by the tip surface of the piston head (2b) and the inner peripheral surface of the cylinder (5). The cylinder chamber (6) is provided with a partition wall (8). The partition wall (8) has a high pressure chamber (first chamber) that faces the gas generator (3). ) (6a) (lower side in FIG. 3) and a decompression chamber (second chamber) (6b) (upper side in FIG. 3) facing the piston head (2b). The partition wall (8) is provided with a communication hole (9) for communicating the high pressure chamber (6a) and the decompression chamber (6b). The hole diameter of this communication hole (9) is formed smaller than the external shape of the explosive before combustion in the gas generator (3) described later. This prevents explosives from passing through the communication hole (9) and entering the decompression chamber (6b) during combustion.

  The gas generator (3) includes an airtight container formed to be ruptured, an explosive (gas generating agent) accommodated in the airtight container, and an ignition device for igniting and burning the explosive ( (Not shown). The ignition device is connected to electrical wiring (not shown) extending from the controller (30). The gas generator (3) is configured such that, as the explosive is burned, the sealed container is ruptured and high pressure gas is jetted into the high pressure chamber (6a).

-Driving action-
Next, the operation of the explosive actuator (1) will be described.

  When the collision detection sensor (20) of the safety device (13) detects a pedestrian collision, an operation signal is input from the controller (30) to the explosive actuator (1). The operation signal is an ignition signal input to the ignition device of the gas generator (3).

  In the explosive actuator (1), when an ignition signal is sent to the ignition device, the ignition device is activated to start combustion of the explosive. Then, the sealed container of the gas generator (3) is filled with the high pressure gas, the pressure in the sealed container rises, the sealed container is ruptured, and the high pressure gas is ejected toward the high pressure chamber (6a). The pressure of the high-pressure chamber (6a) is increased by the jetted high-pressure gas, and the high-pressure gas is reduced in pressure through the communication hole (9) of the partition wall (8), so that the decompression chamber (6b) Flow into. Then, the pressure in the decompression chamber (6b) also rises, the piston head (2b) is pushed due to this pressure rise, and the piston (2) protrudes from the front end of the cylinder (5) as shown in FIG. To do. Then, due to the protrusion of the piston (2), the pressing portion (2c) of the piston (2) comes into contact with the engine hood (11) of the automobile (10) to lift the engine hood (11).

-Effect of the embodiment-
According to this embodiment, the high pressure chamber (6a) is defined in the cylinder chamber (6), so that the vicinity of the explosive is temporarily kept at a high pressure even after the sealed container of the gas generator (3) is ruptured. be able to. Therefore, even after the closed container is ruptured, the combustion state of the explosive can be kept good, and the residue of the explosive can be suppressed and reliably burned.

  As a result, the residue of explosives can be suppressed, so there is no need to design the explosive actuator (1) in consideration of the residue, the amount of explosives can be reduced compared to the conventional, or the explosive actuator (1) Can be made smaller and lighter.

  Further, according to this embodiment, by providing the communication hole (9) in the partition wall (8), the high-pressure gas in the high-pressure chamber (6a) can be decompressed and flowed into the decompression chamber (6b). it can. Therefore, even if the pressure in the high pressure chamber (6a) suddenly rises due to the combustion of the explosive, the pressure in the decompression chamber (6b) does not rise suddenly. Therefore, the strength of the decompression chamber (6b) is increased from the high pressure chamber (6a). Can also be lowered. Thereby, the said decompression chamber (6b) can be reduced in size and weight.

  Further, according to the present embodiment, the pressure in the decompression chamber (6b) can be made lower than that in the high pressure chamber (6a), so that the force pushing the piston (2) is also reduced. Therefore, the movement of the piston (2) becomes gradual, the strength of the bush (4) used as a stopper for the piston (2) can be lowered as compared with the conventional one, and the bush (4) is reduced in size and weight. be able to.

-Modification 1 of embodiment-
FIG. 5 is a longitudinal sectional view showing an explosive actuator (21) according to the first modification of the embodiment.

  The difference between the present embodiment and the first modification of the embodiment is that the cylinder (5) is divided and connected. Only the changes will be described below.

  The cylinder (5) is formed by connecting an upper cylinder (upper body) (5a) and a lower cylinder (lower body) (5b). The upper cylinder (5a) is provided with a decompression chamber (6b), and the lower cylinder (5b) is provided with a high pressure chamber (6a) and a gas generator (3). A partition wall (8) having the communication hole (9) is provided between the upper cylinder (5a) and the lower cylinder (5b).

  In the first modification of the embodiment, the strength of the upper cylinder (5a) having the decompression chamber (6b) can be lower than that of the lower cylinder (5b) having the high pressure chamber (6a). Therefore, the upper cylinder (5a) can be reduced in size and weight. In order to reduce the size and weight, for example, the lower cylinder (5b) may be formed of iron, and the upper cylinder (5a) may be formed of aluminum or resin.

-Modification 2 of embodiment-
FIG. 6 is a longitudinal sectional view showing an explosive actuator (20) according to a second modification of the embodiment.

  The difference between this embodiment and the second modification of the embodiment is that the communication hole (9) of the partition wall (8) is closed by a closing plate (closing member) (9a). The closing plate (9a) is formed with a lower strength than the partition wall (8). The closing plate (9a) is ruptured by the high pressure gas ejected from the gas generator (3) when the high pressure chamber (6a) exceeds a predetermined pressure, and opens the communication hole (9). It is configured.

  In the second modification of the embodiment, by providing the closing plate (9a), the pressure in the high pressure chamber (6a) until the closing plate (9a) ruptures and the communication hole (9) opens. Can be prevented from dropping. Therefore, the time during which explosives are burned efficiently can be made longer than the case where the closing plate (9a) is not provided by the amount that the pressure in the high pressure chamber (6a) does not decrease.

  As described above, the explosives can be burned more efficiently, there is no need to design the explosive actuator (20) in consideration of the explosive residue, and the explosive actuator (20) is reliably reduced in size and weight be able to.

—Modification 3 of Embodiment—
FIG. 7 is a longitudinal sectional view showing an explosive actuator (25) according to Modification 3 of the embodiment.

  The difference between this embodiment and the third modification of the embodiment is that the partition wall (8) is provided not on the inner surface of the cylinder (5) but on the end surface of the gas generator (3). Here, the gas generator (3) is inserted into a sealed container (3c) partially opened, an explosive (3a) accommodated in the closed container (3c), and the explosive (3a). And an electric wire (3d) for igniting the explosive (3a). The closed container (3c) is provided with a closing plate (3b) that closes a part of the opening.

  In the third modification of the embodiment, the partition wall (8) is not necessarily provided on the inner surface of the cylinder (5), and may be provided on the end surface of the gas generator (3). In this case, the high-pressure chamber (6a) is defined in the sealed container (3c) of the gas generator (3), and the decompression chamber (6b) is outside the sealed container (3c) and is a cylinder. A compartment is formed in the room. Even with such a configuration, the same operations and effects as the present embodiment can be obtained.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the present embodiment, the explosive is used as the gas generating agent in the gas generator (3). However, the present invention is not limited to this, as long as it generates gas by reaction.

  In the present embodiment, in the piston (2), the piston head (2b) is connected to the piston rod (2a), but it is not always necessary to connect the piston rod (2a) and the piston head (2b). May not be connected by a separate member, and the piston head (2b) may be configured to push out the piston rod (2a) during operation.

  In the present embodiment, the cylinder (5) and the partition wall (8) are configured as separate members. However, the present invention is not limited to this, and the cylinder (5) and the partition wall (8) may be integrally formed. Good.

  In the present embodiment, only one communication hole (9) is provided in the partition wall (8). However, the present invention is not limited to this, and a plurality of communication holes (9) may be provided. In addition, when providing a some communicating hole (9), it is preferable to make a hole diameter small compared with the case where only one communicating hole (9) is provided.

  In other words, if the hole diameter of only one communicating hole (9) is made small in order to prevent the explosive from passing through, there is a possibility that the area of the high-pressure gas jet opening will be smaller than the minimum required jet opening. is there. However, by providing a plurality of the above-mentioned communication holes (9), the diameter of each communication hole (9) is reduced, and the total area of the ejection openings of each communication hole (9) is reduced to a minimum necessary opening area. Can keep.

  In the second modification of the present embodiment, the partition wall (8) and the closing plate (9a) are formed of separate members, but the present invention is not limited to this, and the partition wall (8) and the closing plate (9a) It may be integrally formed. In this case, the strength of the portion corresponding to the communication hole (9) is intentionally lowered, and when the high pressure chamber (6a) exceeds a predetermined pressure, the portion bursts and the high pressure chamber (6a) And the decompression chamber (6b) are preferably configured to communicate with each other.

  In the second modification of the present embodiment, the communication hole (9) of the partition wall (8) is closed with the closing plate (9a) formed so as to be ruptured at a predetermined pressure in the high-pressure gas. It is not necessary to limit to this, For example, what closes the said communicating hole (9) may be a lid | cover or a plug which comes off from the communicating hole (9) with the said predetermined pressure.

  In this embodiment, the cylinder chamber (6) is divided into the high pressure chamber (6a) and the decompression chamber (6b), thereby reducing the size and weight of the explosive actuator (1). It is not necessary to limit, and the operation performance may be improved with the same size as the conventional one.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for gas pressure actuators.

It is a side view which shows the front part of the motor vehicle provided with the explosive type actuator which concerns on embodiment. It is a side view which shows the state by which the engine hood of the motor vehicle was pushed up. It is a longitudinal cross-sectional view which shows the explosive type actuator which concerns on embodiment. It is a longitudinal cross-sectional view for demonstrating the operation state of the explosive type actuator which concerns on embodiment. It is a longitudinal cross-sectional view which shows the explosive type actuator which concerns on the modification 1 of embodiment. It is a longitudinal cross-sectional view which shows the explosive type actuator which concerns on the modification 2 of embodiment. It is a longitudinal cross-sectional view which shows the explosive type actuator which concerns on the modification 3 of embodiment. It is a longitudinal cross-sectional view which shows the conventional explosive type actuator.

Explanation of symbols

1 Gunpowder actuator (gas pressure actuator)
2 piston
2a Piston rod
2b Piston head
2c Pressing part
3 Gas generator
4 Bush
5 cylinders
6 Cylinder chamber
6a High pressure chamber (first chamber)
6b Decompression chamber (second chamber)
8 Bulkhead
9 Communication hole
10 cars
11 Engine hood
12 Engine room
13 Safety devices
20 Collision detection sensor
30 controller

Claims (7)

A cylinder (5), a piston (2) having a piston head (2b) and a piston rod (2a) capable of moving back and forth in the cylinder (5), and the cylinder (5) and the piston head (2b) form a partition. A gas pressure type actuator comprising a gas generator (3) for injecting high-pressure gas into the cylinder chamber (6) in response to the reaction of the gas generating agent,
The cylinder chamber (6) has a partition wall (8) that divides the cylinder chamber (6) into a first chamber (6a) containing the gas generating agent and a second chamber (6b) separated from the gas generating agent. 8) A gas pressure type actuator characterized in that a communication hole (9) for communicating the first chamber (6a) and the second chamber (6b) is provided in 8). In claim 1,
A closing member (9a) for closing the communication hole (9), and the blocking member (9a) has a predetermined pressure in the first chamber (6a) by the high pressure gas ejected from the gas generator (3); A gas pressure type actuator configured to open the communication hole (9) when the pressure becomes higher than a pressure. In claim 1 or 2,
The gas pressure actuator, wherein the partition wall (8) is provided on an inner surface of the cylinder chamber (6). In claim 1 or 2,
The gas pressure actuator, wherein the partition wall (8) is provided on an end face of the gas generator (3) so as to be located inside the cylinder chamber (6). In any one of Claims 1-4,
A bush (4) is provided which is attached to the end of the cylinder (5) and slidably holds the piston rod (2a) and used as a stopper for the piston head (2b). Gas pressure actuator. In any one of claims 1 to 5,
The cylinder (5) is formed by an upper body (5a) and a lower body (5b) connected to the upper body (5a),
The partition wall (8) is provided between the upper body (5a) and the lower body (5b),
The gas pressure actuator, wherein the lower body (5b) is provided with the first chamber (6a) and the gas generator (3). In claim 6,
A gas characterized in that the upper body (5a) and the lower body (5b) are formed of different materials, and the upper body (5a) is formed of a material lower in strength than the lower body (5b). Pressure actuator.

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