JP6797057B2 - Parachute deployment device - Google Patents

Description

The present invention relates to a pyroactuator, a deploying device including a pyroactuator, an extension device including a pyroactuator, an airbag device including an extension device, and a bonnet lifting device including a pyroactuator.

Conventionally, a pyroactuator operated by combustion gas or combustion heat has been used as a power source for a safety device or an injection device in, for example, an aircraft. Pyroactuators are also used in other applications, such as personnel restraint devices for vehicles, bonnet lifting devices for pedestrian protection for collision mitigation, and devices for pulling in steering wheels. As such a pyroactuator, a type that pushes out a piston by operation is known. In the pyroactuator as described above, it is necessary to arrange the piston at a predetermined position so that the piston before operation does not move in order to control the output or prevent malfunction depending on the application.

For example, Patent Document 1 discloses that an annular groove is formed in a casing accommodating a piston, and an O-ring is provided in the annular groove. The O-ring fixes the piston in place with respect to the casing and prevents the piston from being accidentally displaced.

Japanese Unexamined Patent Publication No. 2003-247509

However, in the above-mentioned prior art, the method of forming an annular groove and providing an O-ring in the annular groove to fix the piston has caused an increase in the number of parts, a complicated structure, and a complicated manufacturing process. It was.

Therefore, the present invention relates to a pyroactuator having a simple structure and capable of holding a piston without increasing the number of parts, a deploying device including a pyroactuator, an extension device including a pyroactuator, and an airbag device including an extension device. And to provide a bonnet lifting device with a pyroactuator.

(1) The parachute deploying device according to the present invention has a cup-shaped case for accommodating an igniter, and is generated by an igniter that generates an operating gas during operation by burning the igniter and the igniter. Pyro said promoted by working gas, and a piston extending recess is formed uniaxial direction at an end portion, said piston by said recesses are pressed against the casing is held in the casing An actuator is used, and a parachute storage container for storing the parachute arranged on the propulsion direction side of the piston head together with the piston is provided, and the parachute is stored in the parachute by using the propulsive force of the piston. It is to be deployed to the outside of the storage container .

According to the configuration of (1) above, the recess of the piston is press-fitted into the case of the igniter to hold the piston in the case. This makes it possible to fix the piston in a predetermined position with a simple structure without increasing the number of parts.

Further, according to the above configuration, the volume of the combustion chamber formed by the outer wall of the case and the inner wall of the recess of the piston can be changed by changing the press-fitting pressure or the press-fitting depth. This makes it possible to easily adjust the output of the pyroactuator (that is, the propulsive force of the piston).

(2) In the parachute deploying device of (1) above, it is preferable that the end portion of the concave portion on the opening side of the inner wall portion along the axial direction is chamfered. The chamfer may be a cut surface or an R surface.

According to the configuration of (2) above, when the recess of the piston is press-fitted into the case, the inner wall portion of the recess is less likely to be caught in the case. In addition, chipping due to contact of the case is less likely to occur.

(3) In the parachute deploying device according to (1) or (2), it is preferable that a discharge groove is provided in the inner wall portion of the recess along the axial direction.

According to the configuration of (3) above, when the recess of the piston is press-fitted into the case, the air in the recess can be released from the discharge groove, so that the recess can be easily press-fitted.

(4) In the parachute deploying device of (1) to (3) above, a surface treatment portion by embossing may be formed on the inner wall portion of the recess along the axial direction.

According to the configuration of (4) above, when the concave portion of the piston is press-fitted into the case, the air in the concave portion can be released from the surface-treated portion which has been roughened by the texture processing, so that the press-fitting is easy.

(5) In the parachute deploying device of (1) to (4) above, ribs may be provided on the inner wall portion of the recess along the axial direction so as to project in a direction intersecting the axial direction.

According to the configuration of (5) above, a space can be formed between the outer wall portion of the case and the inner wall portion of the recess by the rib. As a result, the air in the recess can be released from the space, so that it becomes easy to press-fit.

(6) In the parachute deploying device of (5) above, it is preferable that the ribs are partially formed in an annular shape.

According to the configuration of (6) above, the minimum necessary space can be formed between the outer wall portion of the case and the inner wall portion of the recess by the ribs partially formed in an annular shape. As a result, the air in the recess can be released from the space at the time of press-fitting, so that press-fitting becomes easy.

(7) In the parachute deploying devices (1) to (6) above, the piston has a first portion arranged on the recess side and a diameter opposite to that of the first portion. It may have a different second part.

According to the configuration of (7) above, when a tubular housing for accommodating the piston is adopted and a locking portion is provided in the housing, if the diameter of the first portion is larger than the diameter of the second portion, When the piston is propelled, the step portion between the first portion and the second portion can be brought into contact with the locking portion to prevent the piston from coming out of the housing. That is, it is possible to provide a stopper function to the step portion between the first portion and the second portion.

(8) In the parachute deploying device of the above (7), it is preferable that the first portion has a larger diameter than the second portion.

According to the configuration of (8) above, as described above, the piston can be prevented from coming out of the housing.

(9) In the parachute deploying device according to (7) or (8), the second portion is preferably a piston rod.

According to the configuration of (9) above, the weight of the entire piston can be reduced by forming the second portion of the piston into an elongated piston rod.

(10) It is preferable that the parachute deploying device according to (7) to (9) further includes a tubular housing that regulates the propulsion direction of the piston.

According to the configuration (10) above, since the propulsion direction of the piston can be regulated by the housing, the output direction of the pyroactuator can be made constant.

(11) The parachute deploying device of (10) holds the igniter in a state where the case of the igniter is arranged in the housing, and further includes a holder fixed to one end of the housing. Is preferable.

According to the configuration of (11) above, the holder can stably fix the position of the case of the igniter with respect to the housing, or more strictly, the position of the combustion chamber.

(12) In the parachute deploying device of (11), it is preferable that the housing and the holder are joined by welding.

According to the configuration (12) above, the housing can be firmly fixed to the holder.

(13) In the parachute deploying device according to (11) or (12), the housing has a flange portion extending outward at one end thereof, and the holder is fitted to the flange portion. It may have a fitting groove and a caulking flange for caulking and fixing the flange portion.

According to the configuration of (13) above, the housing can be firmly fixed to the holder.

(14) In the parachute deploying devices (10) to (13), a gap is provided between the outer wall portion of the first portion of the piston and the inner wall portion of the housing, and the first portion in the gap. It is preferable that the first seal member is provided between the outer wall portion of the housing and the inner wall portion of the housing.

According to the configuration (14) above, the first seal member prevents the compressed gas generated in the housing due to the propulsion in the housing of the piston from flowing out from the gap between the outer wall portion of the first portion and the inner wall portion of the housing. can do. As a result, it is possible to avoid a decrease in the propulsive force of the piston.

(15) In the parachute deploying devices (10) to (14), the igniter is fixed to one end of the housing, and the other end of the housing is a hole through which the second portion of the piston is inserted. It is preferable that a locking portion having a portion and locking the first portion when the piston is propelled is provided.

According to the configuration (15) above, the piston can be propelled by the combustion gas or combustion heat generated by the igniter. Then, the second portion of the piston can be propelled outward through the hole. Further, when the piston is propelled, the first portion of the piston can be brought into contact with the locking portion to prevent the piston from coming out of the housing.

(16) In the parachute deploying device of the above (15), a second seal member is provided between the peripheral wall portion of the hole portion in the locking portion and the outer wall portion of the second portion of the piston. Is preferable.

According to the configuration of (16) above, the second seal member can prevent the compressed gas generated in the housing from flowing out from the gap between the outer wall portion of the second portion and the peripheral wall portion of the hole portion. As a result, it is possible to avoid a decrease in the propulsive force of the piston.

(17) In the parachute deploying device according to (15) or (16), the shock absorbing member that cushions the impact generated by the first portion colliding with the locking portion during operation is the first of the pistons. It is preferable that the portion is provided between the one portion and the locking portion.

According to the configuration (17), since the first portion of the piston comes into contact with the impact cushioning member during operation, the impact on the first portion and the locking portion can be alleviated.

(18) In the parachute deploying device according to (11) to (17), the diameter between the first portion and the second portion of the piston is smaller than that of the first portion and is smaller than that of the second portion. A third portion having a large diameter is formed, the diameter of the third portion is smaller than the diameter of the hole portion of the locking portion, and the diameter of the first portion is larger than the diameter of the hole portion. You may.

According to the configuration (18) above, when the piston is propelled, the first portion can be brought into contact with the locking portion to prevent the piston from coming out of the housing. Further, since the gap between the outer wall of the second part of the piston and the inner peripheral wall of the hole is relatively wide, the second part of the piston can be smoothly propelled outward without contacting the inner wall of the hole. Can be done.

According to the present invention, a pyroactuator having a simple structure and capable of holding a piston without increasing the number of parts, a deploying device including a pyroactuator, an extension device having a pyroactuator, and an air bag device including an extension device. And a bonnet lifting device with a pyroactuator can be provided.

It is sectional drawing which shows the structure of the pyroactuator which concerns on one Embodiment of this invention. (A) is a cross-sectional view showing a discharge groove provided in the concave portion of the piston, (b) is a cross-sectional view showing a surface treatment portion provided in the concave portion of the piston, and (c) is provided in the concave portion of the piston. It is sectional drawing which shows the rib. It is sectional drawing which shows the deformation example of a piston. It is a figure which shows the structure of the parachute deployment apparatus provided with the pyroactuator which concerns on one Embodiment of this invention. It is a figure which shows the modification of the parachute deployment apparatus. It is sectional drawing which shows the state before operation of the airbag device provided with the pyroactuator which concerns on one Embodiment of this invention. It is sectional drawing which shows the state after operation of the airbag device of FIG. It is a figure which shows the structure of the bonnet lifting apparatus provided with the pyroactuator which concerns on one Embodiment of this invention.

<Pyroactuator>
Hereinafter, the pyroactuator according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the pyroactuator 1 of the present embodiment holds an igniter 2, a piston 3 extending in the uniaxial direction, a tubular housing 5 that regulates the propulsion direction of the piston 3, and the igniter 2. The holder 6 is provided.

The igniter 2 has a cup-shaped case 2a for accommodating an igniter (not shown), and generates an operating gas during operation by burning the igniter, and is sometimes called a squib. The igniter 2 can also be used by incorporating it into an inflator or a micro gas generator. Here, the case 2a is made of, for example, a metal such as stainless steel, aluminum, copper, or iron. Further, the igniter 2 includes a pair of terminal pins 2b for energizing and a resistor (not shown) made of a nichrome wire or the like connected to the pair of terminal pins 2b. As the igniter, any igniter can be used as long as it functions as an igniter, but generally ZWPP (zirconium / tungsten / potassium perchlorate), ZPP (zirconium / potassium perchlorate), etc. Lead tricinate or the like is used.

The material of the piston 3 is, for example, a metal, a metal alloy, a resin, a resin, an inorganic fiber (glass, carbon fiber, etc.), a metal composite material, or the like. The piston 3 is propulsively provided in the housing 5, is arranged on the igniter 2 side, and has a first portion 3a having an outer diameter substantially the same as the inner diameter of the housing 5 and a second portion 3d having a diameter smaller than that of the first portion 3a. And a piston head 3e provided at the tip of the second portion 3d. In this embodiment, the second portion 3d is a piston rod. The outer diameter of the piston head 3e may be the same as or different from the outer diameter of the housing 5 depending on the application.

The material of the housing 5 is, for example, a metal, a metal alloy, a resin, a resin, an inorganic fiber (glass, carbon fiber, etc.), a metal composite material, or the like. The housing 5 has a locking portion 5a on the piston head 3e side that locks the first portion 3a of the piston 3 when the piston 3 is propelled. The locking portion 5a is provided with a hole portion 5b through which the second portion 3d of the piston 3 is inserted. A part of the second portion 3d of the piston 3 and the piston head 3e are arranged outside the housing 5.

A recess 3b is formed on the first portion 3a of the piston 3 on the igniter 2 side. The piston 3 is held and fixed to the case 2a by press-fitting the recess 3b into the case 2a of the igniter 2. As a result, the combustion chamber 4 is formed in the space surrounded by the case 2a and the recess 3b.

Here, as shown in FIG. 2A, a discharge groove 15 is provided in the inner wall portion of the recess 3b of the piston 3 along the axial direction. As a result, when the recess 3b is press-fitted into the case 2a, the air in the recess 3b can escape from the discharge groove 15, so that the recess 3b can be easily press-fitted. From the same viewpoint, as shown in FIG. 2B, a surface-treated portion 16 having a rough surface by embossing may be formed on the inner wall portion of the recess 3b along the axial direction, or FIG. 2C. As shown in the above, a plurality of ribs 17 may be provided on the inner wall portion of the recess 3b along the axial direction so as to project in the direction perpendicular to the axial direction and partially line up in an annular shape. As a modification, only one rib 17 may be provided. Further, when a plurality of ribs 17 are formed, they may not be provided so as to be arranged in an annular shape on the inner wall portion of the recess 3b. Further, the rib 17 may be formed so as to project in a direction intersecting the axial direction on the inner wall portion along the axial direction.

Further, as shown in FIGS. 1 and 2 (a) to 2 (c), a chamfer 3c is provided at the opening side end portion of the inner wall portion of the recess 3b along the axial direction of the piston 3. The chamfer 3c may be, for example, a cut surface or an R surface.

The igniter 2 is held by the holder 6 with the case 2a arranged in the housing 5. One end of the housing 5 (the end opposite to the locking portion 5a side) is closed by the igniter 2. The holder 6 is fixed to the one end portion of the housing 5. Specifically, the housing 5 has a flange portion 5c extending outward in the axial direction at one end thereof. The holder 6 has a fitting groove 6b that is fitted into the flange portion 5c, and a caulking flange 6a for caulking and fixing the flange portion 5c. In such a configuration, the housing 5 is fixed to the holder 6 by caulking and fixing the flange portion 5c to the flange portion 5c of the housing 5 in a state where the fitting groove 6b of the holder 6 is fitted to the flange portion 5c of the housing 5. Has been done. The housing 5 and the holder 6 may be joined by welding. The holder 6 is made of, for example, a metal, a metal alloy, a resin, a resin and an inorganic fiber (glass, carbon fiber, etc.), a metal composite material, or a thermoplastic resin. Examples of the thermoplastic resin include synthetic resins such as PBT (polybutylene terephthalate), PET (polybutylene terephthalate), PA6 (nylon 6), PA66 (nylon 66), PPS (polyphenylene sulfide), and PPO (polyphenylene oxide) and glass. A mixture of fibers and the like is preferable. Further, the holder 6 may be a thermosetting resin composed of a room temperature curing type or a thermosetting type, and may further contain a curing agent, a curing accelerator, or the like, if necessary. Examples of the thermosetting resin include epoxy resin, phenol resin, unsaturated polyester, polyurethane, polyimide, silicon resin and the like.

An annular groove 7 is provided on the outer peripheral portion of the first portion 3a of the piston 3. An annular first seal member 8 is provided in the annular groove 7. As the first seal member 8, for example, an O-ring can be adopted. With such a configuration, the space between the outer wall portion of the first portion 3a of the piston 3 and the inner wall portion of the housing 5 is closed by the first seal member 8 when the piston 3 is stopped and propulsion. .. Here, as a modification, the annular groove 7 and the first seal member 8 may not be provided.

On the other hand, an annular groove 9 is provided in the peripheral wall portion of the hole portion 5b in the locking portion 5a. An annular second seal member 10 is provided in the annular groove 9. As the second seal member 10, for example, an O-ring can be adopted. With such a configuration, the space between the peripheral wall portion of the hole portion 5b and the outer wall portion of the second portion 3d of the piston 3 is closed by the second seal member 10 when the piston 3 is stopped and propulsion. There is. Here, as a modification, the annular groove 9 and the second seal member 10 may not be provided.

The shock absorbing member 11 is provided on the surface of the locking portion 5a that the first portion 3a of the piston 3 comes into contact with during propulsion. The shock absorbing member 11 is formed of, for example, rubber, gel, styrofoam, or the like. When the first portion 3a collides with the impact cushioning member 11, the impact cushioning member 11 is elastically or plastically deformed, so that the impact force on the first portion 3a and the locking portion 5a is reduced. There is. In the present embodiment, the shock absorbing member 11 is formed in an annular shape, but the present invention is not limited to this, and other shapes such as a dot shape may be used. Here, the shock absorbing member 11 may be fixed to the second portion 3d side of the first portion 3a of the piston 3, or may be fixed to the first portion 3a, the locking portion 5a, and the housing 5 without being fixed. It may be provided in a space surrounded by an inner wall portion.

In the pyroactuator 1 having the above configuration, when a predetermined amount of current is supplied to the terminal pin 2b of the igniter 2, Joule heat is generated in the resistor and the igniter starts combustion. The high temperature flame generated by the combustion bursts the case 2a containing the igniter. As a result, the heat particles generated by the combustion of the igniter flow into the combustion chamber 4 and propel the piston 3 in the direction of the arrow in FIG. The time from when a current flows through the resistor until the igniter 2 operates is generally 2 milliseconds or less when a nichrome wire is used for the resistor.

As described above, according to the present embodiment, the piston 3 is held in the case 2a by press-fitting the recess 3b of the piston 3 into the case 2a of the igniter 2. This makes it possible to fix the piston 3 in a predetermined position with a simple structure without increasing the number of parts. Further, by changing the press-fitting pressure or the press-fitting depth, the volume of the combustion chamber 4 formed by the outer wall of the case 2a and the inner wall of the recess 3b can be changed. This makes it possible to easily adjust the output of the pyroactuator 1 (that is, the propulsive force of the piston 3).

Further, in the present embodiment, the recess 3b is provided with a chamfer 3c at the opening side end of the inner wall portion along the axial direction of the piston 3, so that the recess 3b is pressed into the case 2a when the recess 3b is press-fitted. The inner wall portion is less likely to be caught in the case 2a. In addition, the opening of the recess 3b is less likely to be chipped due to contact with the case 2a.

Further, in the present embodiment, the space between the outer wall portion of the first portion 3a of the piston 3 and the inner wall portion of the housing 5 is closed by the first seal member 8 when the piston 3 is stopped and propulsion. There is. As a result, the humidity inside the housing 5 can be kept constant, and the igniting agent and the like inside the igniter 2 can be protected from the humidity of the outside air. Further, it is possible to prevent the compressed gas generated in the housing 5 from being propelled in the housing 5 of the piston 3 from flowing out from the gap between the outer wall portion of the first portion 3a and the inner wall portion of the housing 5. As a result, it is possible to avoid a decrease in the propulsive force of the piston 3.

Further, in the present embodiment, the space between the peripheral wall portion of the hole portion 5b and the outer wall portion of the second portion 3d of the piston 3 is closed by the second seal member 10 when the piston 3 is stopped and propulsion. ing. As a result, the humidity inside the housing 5 can be kept constant, and the igniting agent and the like inside the igniter 2 can be protected from the humidity of the outside air.

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

In the above embodiment, the first portion 3a and the second portion 3d are adopted as the components of the piston 3, but the piston 21 as shown in FIG. 3 may be adopted. The piston 21 has a third portion 21c between the first portion 21a and the second portion 21b, which has a diameter smaller than the maximum diameter of the first portion 21a and a diameter larger than that of the second portion 21b. The diameter of the third portion 21c is smaller than the diameter of the hole 20b of the locking portion 20a of the housing 20, and the diameter of the first portion 21a is larger than the diameter of the hole 20b. The first portion 21a is composed of a main body portion 21d having an outer diameter substantially the same as the inner diameter of the housing 20, and a recess 21e having a diameter smaller than that of the main body portion 21d and being press-fitted into the case of the igniter. .. According to such a configuration, when the piston 21 is propelled, the first portion 21a can be brought into contact with the locking portion 20a to prevent the piston 21 from coming out of the housing 20. Further, since the space between the outer wall of the second portion 21b of the piston 21 and the inner peripheral wall of the hole portion 20b is relatively wide, the second portion 21b does not come into contact with the inner peripheral wall of the hole portion 20b and is smoothly directed outward. Can be promoted.

Further, in the above embodiment, the igniter 2 alone is adopted as the source of the propulsive force of the piston 3, but the present invention is not limited to this, and a disk-type gas generator provided with the igniter 2 is generated. All gas generators such as vessels, cylinder-type gas generators, and micro gas generators can be used as sources of propulsion for the piston 3.

<Parachute deployment device>
Next, a parachute deploying device including a pyroactuator will be described. As shown in FIG. 4, the parachute deploying device 50 includes a parachute 56, 57, a cup-shaped parachute storage container 51 for accommodating the parachute 56, 57 before deployment, and a support provided on the inner bottom of the parachute storage container 51. The pillar 52 is provided inside with a pyroactuator similar to the above-mentioned pyroactuator 1, and is provided with three pipe portions 53, 54, 55 connected to the support pillar 52. A pyroactuator 100 is provided in the pipe portion 53, a pyroactuator 101 is provided in the pipe portion 54, and a pyroactuator 102 is provided in the pipe portion 55. The tube portions 53, 54, 55 are arranged like an umbrella bone, for example.

The projectile 53a is inserted into the tube portion 53 with a part exposed, and similarly, the projectile 54a is inserted into the tube portion 54 with a part exposed, and the projectile 54a is inserted into the tube portion 55. , The projectile 55a is inserted with a part exposed. The parachute 56 is connected to the projectile 53a by a string 58 and is connected to the projectile 55a by a string 59. Further, the parachute 57 is connected to the projectile 55a by the string 60 and is connected to the projectile 54a by the string 61.

In such a configuration, the projectile 53a is emitted by the propulsion of the piston Pyro actuator 100, projectile 54a is emitted by the propulsion of the piston Pyro actuator 101, projectile 55a is emitted by the propulsion of the piston Pyro actuator 102 As a result, the strings 58, 59, 60, 61 are pulled in the injection direction, and the parachutes 56, 57 are deployed.

As described above, since the parachute deploying device 50 includes the pyroactuators 100, 101, and 102, the piston can be fixed in a predetermined position with a simple structure and without increasing the number of parts, as described above. Is possible. Further, the volume of the combustion chamber can be changed by changing the press-fitting pressure or the press-fitting depth. This makes it possible to easily adjust the outputs (that is, the propulsive force of the piston) of the pyroactuators 100, 101, and 102. Therefore, the deploying force of the parachutes 56 and 57 can be easily adjusted.

Here, as described below, a modified example of the parachute deploying device 50 can also be adopted. As shown in FIG. 5, the parachute deploying device 90 according to the modified example includes the same pyroactuator 200 and parachute 86 as the pyroactuator 1 described above. The pyroactuator 200 includes an igniter 84 having a cup-shaped case 85 for accommodating an igniter (not shown), a piston 81 having a recess 82 and a piston head 83 integrally formed with the recess 82, and a piston 81. It is provided with a bottomed tubular housing 80 that accommodates the piston 81 and regulates the propulsion direction of the piston 81.

The parachute 86 is housed in the housing 80 in a state of being arranged on the piston head 83. In such a configuration, the parachute 86 can be directly pushed out and deployed by the propulsion of the piston 81. The open end of the housing 80 is closed by the lid 87 in the initial state, and is removed from the open end by pushing out the parachute 86.

<Extension device and airbag device equipped with it>
Next, an extension device provided with a pyroactuator and an airbag device provided with the extension device will be described.

As shown in FIG. 6, the airbag device 70 is provided in a pyroactuator 300, an airbag 62, and the airbag 62, which are substantially the same as the above-mentioned pyroactuator 1, and one end thereof is connected to the inside of the airbag 62. The other end is provided with an extendable extension device 63 connected to the piston 67 of the pyroactuator 300. The airbag device 70 may include an airbag storage container (not shown) for storing the airbag 62. The extension device 63 is housed in the airbag 62 in a contracted state in the initial state, and is configured to extend in the airbag 62 when dropped. Further, the extension device 63 can be used as a plurality of legs or the like provided at the lower part of a drone (not shown), which is an example of an aircraft, and operates in an emergency such as when the drone falls out of control. It stretches and absorbs the impact from the outside.

One end (upper end) of the extension device 63 is connected to the inside of the airbag 62 by a connecting member 64. The stretching device 63 includes a tubular member 65 connected to the connecting member 64, and a tubular member 66 inserted into the tubular member 65 and slidable in the length direction. The piston 67 is inserted into the tubular member 66 and is slidable in the length direction. The tip of the piston 67 is provided with a ring-shaped member 68 having an outside air suction port 68a with a check valve, which serves as a portion that comes into contact with the ground when a drone or the like lands.

The tubular member 65 is a member having a bottom formed at an end on the connecting member 64 side. At the center of the bottom of the tubular member 65, an igniter 69 of a pyroactuator 300 for pushing the piston 67 downward in FIG. 6 by gas is fixedly installed. The tubular members 65 and 66 are made of metal, metal alloy, plastic, or resin, and are connected so as to have a telescopic structure. In the present embodiment, the tubular members 65 and 66 are preferably formed of a flexible material such as rubber or carbon. The tubular members 65 and 66 are formed so that the inner diameter of the tubular member 65 and the outer diameter of the tubular member 66 substantially match. Then, when the tubular member 66 is housed in the tubular member 65, the entire extension device 63 contracts, and when the tubular member 66 protrudes from the tubular member 65, the entire extension device 63 expands.

The piston 67 can be made of metal, metal alloy, plastic, or resin. In this embodiment, the piston 67 is preferably formed of a flexible material such as rubber or carbon. As described above, when the piston 67 and the above-mentioned tubular members 65 and 66 are made of a flexible material, the piston 67 and the tubular members 65 and 66 are bent or deformed or deformed due to an impact at the time of a drone crash or collision. Distort and deform. As a result, the impact can be absorbed. The piston 67 may be formed of a composite material such as carbon fiber. Further, the piston 67 is connected to the tubular member 66 so as to have a telescopic structure. Further, the tubular member 66 and the piston 67 are formed so that the inner diameter of the tubular member 66 and the outer diameter of the piston 67 substantially match. Then, when the piston 67 is housed in the tubular member 66, the entire extension device 63 contracts, and when the piston 67 protrudes from the tubular member 66, the entire extension device 63 expands.

The configuration of the piston 67 of the pyroactuator 300 used in the airbag device 70 is as follows. That is, the piston 67 includes an opening 67a provided at the tip portion, and a hole portion 67c that communicates the opening 67a and the internal space 62a of the airbag 62 with the internal space 67b of the piston 67. A check valve (not shown) is provided in the opening 67a so that the outside air sucked from the outside does not flow back.

The inner wall portion of the ring-shaped member 68 is fixed to the tip of the piston 67 via a connecting member (not shown). Further, the space between the inner wall portion of the ring-shaped member 68 and the outer wall portion of the piston 67 is the outside air suction port 68a. The outside air suction port 68a sucks outside air into the internal space 62a of the airbag 62 when the extension device 63 is extended (in other words, when the airbag 62 is deployed). The outside air suction port 68a is provided with a check valve (not shown) so that the outside air sucked from the outside does not flow back. Further, one end of the airbag 62 is attached to the outer periphery of the ring-shaped member 68.

In such a configuration, the airbag 62 is folded in a bellows shape as shown in FIG. 6 before deployment, and expands substantially spherically as shown in FIG. 7 after deployment. The airbag 62 is provided with a hole 62b (see FIG. 7) so that a part of the outside air introduced into the internal space 62a of the airbag 62 can flow out to the outside as needed. .. As a result, the posture of the airbag 62 is stabilized after the airbag 62 is deployed. Further, if the size of the hole 62b is adjusted appropriately, the gas in the internal space 62a at the time of collision with the object is prevented from bouncing due to the excessive repulsive force when the airbag 62 collides with the object. It is also possible to realize the function of pulling out.

Subsequently, the operation of the airbag device 70 including the extension device 63 will be described. First, (1) an acceleration sensor (not shown) mounted on the drone detects an acceleration equal to or higher than a predetermined value (for example, a preset acceleration that is assumed to be falling), or (2) the drone When the on-board receiving unit is in a state where the control signal of the transmitting unit of the control device cannot be received for a predetermined time or longer, the control unit (CPU, ROM, etc.) mounted on the drone A computer having a RAM or the like) transmits an operation signal of the igniter 69 of the pyroactuator 300, and the igniter 69 operates. As a result, the piston 67 propels downward in FIG. 6 and the airbag 62 begins to deploy. At this time, since the internal space 62a becomes a negative pressure with respect to the outside air, the outside air begins to flow in from the outside air suction port 68a, and the airbag 62 further expands. Since the negative pressure state with respect to the outside air continues during the deployment of the airbag 62, the outside air further flows in from the outside air suction port 68a until the piston 67 is fully extended to the position shown in FIG.

After the piston 67 is fully extended, the hole 67c is opened so that the opening 67a and the internal space 62a communicate with each other. As a result, the outside air flows in from the opening 67a and flows into the internal space 62a through the internal space 67b and the hole 67c. At the same time, the airbag 62 further expands while the tubular member 66 extends telescopically. Also at this time, since the negative pressure state with respect to the outside air continues in the internal space 62a, the outside air flows into the internal space 62a from the outside air suction port 68a and the opening 67a until the tubular member 66 is fully extended. After the tubular member 66 is fully extended, the expansion of the airbag 62 is completed.

As described above, since the airbag device 70 includes the pyroactuator 300, it is possible to fix the piston 67 at a predetermined position with a simple structure and without increasing the number of parts, as described above. It becomes. Further, the volume of the combustion chamber can be changed by changing the press-fitting pressure or the press-fitting depth. This makes it possible to easily adjust the output of the pyroactuator 300 (that is, the propulsive force of the piston 67). As a result, the extension speed of the extension device 63 can be adjusted, so that the deployment speed of the airbag 62 can be easily adjusted.

<Bonnet lifting device>
Next, a bonnet lifting device including a pyroactuator will be described. As shown in FIG. 8, the bonnet lifting device 130 includes a pyroactuator 400 and a connecting member 114 connected to the lower part of the hood portion of the bonnet 141 of the vehicle body 140. The connecting member 114 is provided at the tip (upper end) of the second portion 111b of the piston 111, which will be described later, so as to be rotatable by the rotating shaft 115. Since the piston actuator 400 is the same as the piston actuator 1 described above, detailed description thereof will be omitted, but an igniter 112 having a cup-shaped case 113 for accommodating an ignition charge (not shown), a first portion 111a, and a second portion 111a A piston 111 having a portion 111b and a recess 111c, a hole 110a for propellably inserting a second portion 111b of the piston 111, and a plurality of holes 110b provided in a direction perpendicular to the propulsion direction of the piston 111 and a piston 111. It is provided with a tubular housing 110 that regulates the propulsion direction of the.

In such a configuration, when a collision of a human or an animal is detected by a collision detection sensor provided on, for example, a front bumper of the vehicle body 140, the piston 111 is propelled upward by the same method as described above in the pyroactuator 400. .. As a result, the hood portion of the bonnet 141 is lifted, so that the impact on humans and the like is alleviated. Further, when a human or the like collides with the bonnet 141, the compressed gas generated in the housing 110 due to the reaction force due to the collision flows out from the hole 110b, so that the impact on the human or the like is further mitigated. There is.

As described above, since the bonnet lifting device 130 is provided with the pyroactuator 400, it is possible to fix the piston 111 at a predetermined position with a simple structure and without increasing the number of parts, as described above. It becomes. Further, the volume of the combustion chamber can be changed by changing the press-fitting pressure or the press-fitting depth. This makes it possible to easily adjust the output of the pyroactuator 400 (that is, the propulsive force of the piston 111). Thereby, the lifting force or the lifting speed of the bonnet 141 can be easily adjusted.

1,100,101,102,200,300,400 Pyroactuator 2,69,84,112 Ignition device 2a, 85, 113 Case 2b Terminal pin 3, 21, 67, 81, 111 Piston 3a, 21a, 111a 1st Part 3b, 21e, 82, 111c Recess 3c Chamfering 3d, 21b, 111b Second part 3e, 83 Piston head 4 Combustion chamber 5, 20, 80, 110 Housing 5a, 20a Locking part 5b, 20b, 110a, 110b Hole 5c Flange 6 Holder 6a Caulking flange 6b Fitting groove 7, 9 Circular groove 8 First seal member 10 Second seal member 11 Impact buffer member 15 Discharge groove 16 Surface treatment part 17 Rib 21c Third part 21d Main body part 50, 90 Parachute deploying device 51 Parachute storage container 52 Support pillar 53, 54, 55 Pipes 53a, 54a, 55a Projectors 56, 57, 86 Parachute 58, 59, 60, 61 String 62 Airbag 62a, 67b Internal space 62b Hole 63 Extension Device 64 Connecting member 65, 66 Cylindrical member 67a Opening 67c Hole 68 Ring-shaped member 68a Outside air suction port 70 Air bag device 87 Lid 114 Connecting member 115 Rotating shaft 130 Bonnet lifting device 140 Body 141 Bonnet

Claims (18)

An igniter having a cup-shaped case for accommodating the igniter and generating an operating gas during operation by burning the igniter,
A piston propelled by the working gas generated by the igniter, having a recess formed at an end and extending in a uniaxial direction, is provided.
A parachute deploying device using a pyroactuator, characterized in that the piston is held in the case by press-fitting the recess into the case .
The piston has a piston head on the propulsion direction side.
A parachute storage container for storing the parachute arranged on the propulsion direction side of the piston head together with the piston is provided.
A parachute deploying device that deploys the parachute to the outside of the parachute storage container using the propulsive force of the piston . The parachute deploying device according to claim 1, wherein the end of the concave portion on the opening side of the inner wall portion along the axial direction is chamfered. The parachute deploying device according to claim 1 or 2, wherein a discharge groove is provided in an inner wall portion of the recess along the axial direction. The parachute deploying device according to any one of claims 1 to 3, wherein a surface-treated portion by embossing is formed on an inner wall portion of the recess along the axial direction. The parachute deploying device according to any one of claims 1 to 4, wherein a rib protruding in a direction intersecting the axial direction is provided on an inner wall portion of the recess along the axial direction. The parachute deploying device according to claim 5, wherein when a plurality of the ribs are provided, the ribs are separated from each other and provided in an annular shape. The piston according to any one of claims 1 to 6, wherein the piston has a first portion arranged on the concave portion side and a second portion arranged on the opposite side to the concave portion side and having a diameter different from that of the first portion. The parachute deploying device according to any one item. The parachute deploying device according to claim 7, wherein the first portion has a diameter larger than that of the second portion. The parachute deploying device according to claim 7 or 8, wherein the second portion is a piston rod. The parachute deploying device according to any one of claims 7 to 9, further comprising a tubular housing that regulates the propulsion direction of the piston. The parachute deployment according to claim 10, wherein the case of the igniter holds the igniter in a state of being arranged in the housing, and further includes a holder fixed to one end of the housing. Equipment . The parachute deploying device according to claim 11, wherein the housing and the holder are joined by welding. The housing has a flange portion extending outward at one end thereof.
The parachute deploying device according to claim 11 or 12, wherein the holder has a fitting groove fitted to the flange portion and a caulking collar for caulking and fixing the flange portion. A gap is provided between the outer wall portion of the first portion of the piston and the inner wall portion of the housing, and a first seal member is provided between the outer wall portion of the first portion and the inner wall portion of the housing in the gap. The parachute deploying device according to any one of claims 10 to 13, wherein the parachute deploying device is provided . The igniter is fixed to one end of the housing, and the other end of the housing has a hole through which the second portion of the piston is inserted and locks the first portion when the piston is propelled. The parachute deploying device according to any one of claims 10 to 14, wherein a stop portion is provided. The parachute deploying device according to claim 15, wherein a second seal member is provided between the peripheral wall portion of the hole portion in the locking portion and the outer wall portion of the second portion of the piston. A shock absorbing member for cushioning an impact generated when the first portion collides with the locking portion during operation is provided between the first portion of the piston and the locking portion. The parachute deploying device according to claim 15 or 16. A third portion having a diameter smaller than that of the first portion and a diameter larger than that of the second portion is formed between the first portion and the second portion of the piston.
Any one of claims 15 to 17, wherein the diameter of the third portion is smaller than the diameter of the hole portion of the locking portion, and the diameter of the first portion is larger than the diameter of the hole portion. Parachute deployer according to section.

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