JPH04128955U - Inflator with starting device and starting device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a starting device that can make the ignition energy of the ignition member uniform while ensuring the ignition redundancy of the system, as well as to shorten the height dimension, and to prevent gas from ignition from the detonator. An object of the present invention is to obtain an inflator equipped with a starting device capable of shortening the time required for combustion of generated substances. [Configuration] A starting device 34 is located at the axis of the inflator 24.
is arranged, and a detonator 90, a booster charge 92, and a gas generating substance 94 are arranged concentrically with this. Disposed within the starting device 34 are a ball 48 that moves inertially when the vehicle suddenly decelerates, a trigger block 52 that moves following the ball 48, and a pair of ignition pins 64 and 66 that move toward the detonator. The pair of ignition pins 64 and 66 are urged by the same compression coil spring 68. Therefore, the above object can be achieved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention operates when a vehicle suddenly decelerates, and is particularly preferably applied to airbag devices. The present invention relates to a new starting device and an inflator equipped with the starting device.

0002

[Conventional technology]

The activation device and inflator that operate when the vehicle suddenly decelerates, for example, the steering wheel. It is installed in a type of airbag device that is attached to the airbag. This kind of air The inflator of the bag device has a cylindrical shape as shown in Figure 7. A starting device 100 is disposed at the axial center of the motor. Inside the starting device 100, there is a sudden decrease in vehicles. A ball (not shown) that moves inertially at high speeds is placed; As a result, the ignition pin, which is pressed and biased by the compression coil spring, moves toward the passenger. It is supposed to be done. On the movement trajectory of this ignition pin (on the passenger side), there is a pair of A detonator 102 is arranged, and when the ignition pin collides with this detonator 102, the Then, the spark is guided to the booster 104 and grown, and the spark is inside the inflator 106. It is configured to combust a gas generating substance 108 sealed in the peripheral portion of the gas generating substance 108 . After a large amount of gas passes through filters 110, 112, and 114, gas holes 11 6 into a bag (not shown) and inflates the bag.

0003 Here, in the above-mentioned starting device 100, the ignition pin ignites the detonator 102. The ignition energy is determined by the biasing force of the compression coil spring.

0004

[Problem that the idea aims to solve]

However, in such a conventional starting device 100, the ignition redundancy of the system is limited. In order to ensure that the ball, ignition pin, and the Two compression coil springs were installed in each case. For this reason, compression coil springs Manufacturing errors etc. when manufacturing the compression coil spring and when assembling the compression coil spring into the starting device 100 Due to assembly errors, etc., there may be slight variations in the pressing force of each compression coil spring. There was a problem that this could occur.

[0005] Further, in the inflator 106 described above, the axial direction and the The starting device 100, the detonator 102, and the booster charge 104 are arranged sequentially toward the driver side. Therefore, there is a problem in that the height of the inflator 100 increases toward the passenger side. this To solve the problem, a pair of ignition pins are inflated, as shown in Figure 8. According to another configuration configured to move in a direction perpendicular to the axis of the data center 120 and in the same direction as each other. A starting device 122 and a pair of detonators 12 adapted to the configuration of the starting device 122. 6 is placed on the movement trajectory of the ignition pin (on the axis parallel to the axis of the starting device 122), In addition, the inflator 120 has the explosive charge 124 arranged around the axis of the starting device 122. However, with this configuration, the side opposite to the direction of movement of the ignition pin (a position opposite to the pair of detonators 126 across the starting device 122) The thermal energy of the spark from detonator 126 is slower to propagate to explosive charge 124A. , that is, the time it takes for the gas generating substance 128 to generate a large amount of gas from the detonator 126 A new problem arises in that it becomes longer.

[0006] The present invention takes the above facts into consideration, and while ensuring the ignition redundancy of the system, the ignition member The first objective is to obtain a starting device that can make the ignition energy uniform. , the height dimension is shortened, and the time required from the ignition of the detonator to the combustion of the gas-generating material is reduced. The second objective is to obtain an inflator with a starting device that can shorten the It is said that

[0007]

[Means to solve the problem]

The present invention according to claim 1 provides an inertial body that inertially moves when a vehicle suddenly decelerates; an ignition member that moves due to inertial movement of the ignition member; and a biasing means that biases the ignition member; , wherein the ignition member is provided in plurality and at least The respective moving directions of the pair of ignition members are mutually opposite directions, and the plurality of ignition members The members are biased by the same biasing means and the inertial displacement of the single inertial body It is characterized by being able to move by movement.

[0008] The present invention as set forth in claim 2 is characterized in that the starting device is arranged substantially in the center; a detonator disposed on the movement trajectory of the ignition member, and the detonator ignites. A gas generating agent that generates gas by communicating with the detonator and the gas generating agent. an inflator that spouts out the gas when the vehicle suddenly decelerates; The detonator is disposed between the booster and the starting device, and the detonator and The booster is arranged in a plane perpendicular to the height direction of the activation device. In addition, each of the detonator and the booster are arranged on a concentric circle centered on the starting device. It is characterized by being placed.

[0009]

[Effect]

According to the present invention as set forth in claim 1, the inertial body does not move due to inertia during normal vehicle running conditions. The ignition members will not move due to the urging force of the urging means. . Therefore, the activation device remains inactive. From this state, the vehicle suddenly decelerates. , the inertial body undergoes a large inertial movement. Therefore, the plurality of ignition members are activated by the urging force of the urging means. , and the activation device becomes operational.

0010 Here, a plurality of ignition members are provided, and each movement of at least one pair of ignition members Ignition of the system to which the starting device is applied because the directions are opposite to each other Redundancy is ensured. Further, the plurality of ignition members are biased by the same biasing means. , and moves by the inertial movement of a single inertial body. i.e. these multiple ignitions Since the members receive the same inertia force and move with the same urging force, The ignition energy of the ignition member after the movement becomes uniform.

[0011] According to the present invention as set forth in claim 2, when the vehicle suddenly decelerates, the ignition of the starting device is activated. The component collides with the detonator, creating a spark. This spark is guided by a gas generating agent via a carrier. As a result, the gas generating agent generates and blows out gas.

0012 Here, the starting device is arranged approximately in the center, and the starting device is arranged in a height direction of the starting device. Since the detonator and the booster are arranged in a plane perpendicular to the Dimensions can be shortened. Moreover, each of the detonator and booster is centered around the starting device. In an inflator that is arranged on a concentric circle and is equipped with the starting device, At least one pair of ignition members among the plurality of ignition members move in opposite directions. As a result, the ignition power of the detonator is propagated from both sides of the booster charge. Therefore, from the ignition of the detonator The time required for combustion of the explosive charge and, by extension, the gas generating agent is shortened.

[0013]

【Example】

FIG. 4 shows an airbag device 10 according to this embodiment. This airbag The gaging device 10 includes a substantially box-shaped base plate 14. The steering wheel 18 is connected to the steering wheel 18 via a substantially box-shaped support bracket 16. It is attached to the hub 18A. The base plate 12 has an airbag cover 2 0, a bag body 22, and an inflator 24 are attached.

[0014] The airbag cover 20 is arranged on the passenger side of the base plate 14. child A frame-shaped core metal (not shown) is embedded around the pad 20, and this core The airbag cover 20 is attached to the periphery of the base plate 14 with metal rivets or the like. Fixed. In addition, the portion of the airbag cover 20 facing the base plate 14 A thin wall portion 32 is formed in the airbag cover 20, and the airbag cover 20 is torn at this thin wall portion 32. It's getting easier.

[0015] The bag body 22 is arranged in a folded state on the passenger side of the base plate 14, Moreover, it is stored between the base plate 14 and the airbag cover 20. this The opening edge of the bag body 22 has a ring plate located approximately in the center of the base plate 14. It is attached via 38. This ring plate 38 is secured with bolts (not shown). It is tightened to the base plate 14, and the opening side edge of the bag body 22 is attached to the base plate 1. I'm pushing it to 4.

[0016] The inflator 24 has a substantially cylindrical shape, and its passenger side half is attached to the base plate 14. It is arranged to penetrate through the circular hole. The inflator 24 has an inflator at its axially intermediate portion. A rectangular flange 30 is formed extending in the radial direction of the rotor 24. It is fixed to the surface of the base plate 14 on the side opposite to the passenger through the screw 30 with a bolt or the like (not shown). It is worn. Further, on the passenger side circumferential surface of the inflator 24, a plurality of pieces are arranged at predetermined intervals. Gas holes 33 are formed.

[0017] As shown in FIG. 3, this inflator 24 has a hat-shaped upper cover 8. 4 and a substantially cylindrical lower cover 86, which together form a substantially cylindrical column. It is said to be the shape. One axial end surface of the lower cover 86 is closed at the axial center. A cylindrical bulge 87 is formed to protrude toward the upper cover 84. Ru. The activation device 34, which will be described later, is housed inside this bulge 87, and in this state, the activation device 34 is The activation device 34 is fixed by threading the port ring 88. Ma Additionally, a pair of detonators 90 are arranged around the outer periphery of the starting device 34 . In addition, Between the upper cover 84 and the lower cover 86, there is a gap between the pair of detonators 90 and the gas holes 33. An explosive charge 92, a gas generating substance 94 as a gas generating agent, and three types of filters 9. 6, 97, and 98 are arranged concentrically. Therefore, when the vehicle suddenly decelerates, The starting device 34 operates to ignite the detonator 90 and release the gas-generating material through the booster charge 92. 94 is burned and a large amount of gas is generated. Gas passes through filters 96, 97, 98 Therefore, after cooling and removing debris, etc., it is guided into the bag body 22 through the gas hole 33. Ru.

[0018] Now, as shown in FIGS. 1 and 2, the starting device 34 has one end surface in the axial direction. It includes a closed cylindrical upper body 40 and a lower body 42. A cylindrical starting device 34 is formed by fitting these together. These a When the upper body 40 and the lower body 42 are fitted together, the same circumferential surface is formed. A circular hole 44 is formed on the shaft (in the direction perpendicular to the axis of the starting device 34), and a The tip portions of the shaft portions 64A, 66A of the fire pins 64, 66 are arranged to penetrate through them.

[0019] A cylinder 50 is coaxially arranged on the upper body 40, and this cylinder Only one ball 48, which acts as an inertial body that moves inertially when the vehicle suddenly decelerates, is housed in the 50. It is tolerated. There is a dorigab on the side of the inertial movement direction of the ball 48 (direction of arrow A in Fig. 1). A lock 52 is arranged. The trigger block 52 has a substantially cubic shape. The inside thereof is hollow and the ball 48 side is open. Driga block 5 The side facing the ball 48 of No. 2 has a concave shape that makes close contact with the surface of the ball 48. The ball 48 is in contact with the ball 48. In addition, the ball 48 of the driga block 52 A protrusion 54 is erected at the center of the opposite side. For this protrusion 54 Accordingly, a projection 56 is also provided at the center of the bottom of the lower body 42, and these projections A bias spring 58 is wound around 54 and 56. For this reason, Dorigab The lock 52 is biased in a direction opposite to the direction of inertial movement of the ball 48. Also , facing each other in a direction perpendicular to the inertial movement direction of the balls 48 of the trigger block 52. Rectangular openings 60 and 62 are formed in the side surfaces thereof, respectively. this Shaft portions 64A and 66A of ignition pins 64 and 66, which will be described later, pass through these openings 60 and 62. I'm passing through. Further, the opening area of these openings 60 and 62 corresponds to the ignition pin 64 which will be described later. , 66.

[0020] The axial halves of a pair of ignition pins 64 and 66 are housed within the trigger block 52. ing. These ignition pins 64 and 66 have a cylindrical shape with one axial end surface closed. shaped bases 64B, 66B and a shaft portion 64A erected from the axis of the bases 64B, 66B. , 66A. Part of the circumferential surface of the bases 64B, 66B of the ignition pins 64, 66 is It is locked to step portions 52A and 52B of the rigger block 52. In addition, the ignition pin 64 , 66 has shaft parts 64A and 66A arranged on the same straight line and separated from each other. The ball 48 is arranged in a direction in which the ball 48 moves in a direction perpendicular to the inertial movement direction of the ball 48. It is.

[0021] A single compression coil spring is connected between the bases 64B and 66B of these ignition pins 64 and 66. 68 is provided. One end of the compression coil spring 68 is connected to the base of one ignition pin 64. 64B, and the other end of the compression coil spring 68 is connected to the other ignition pin 66. It is locked into the base 66B. Therefore, each ignition pin 64, 66 is spaced apart from each other. The ball 48 is pressed in a direction perpendicular to the direction of inertial movement of the ball 48. . A detonator 90 is arranged on the locus of movement of each ignition pin 64, 66.

[0022] The operation of this embodiment will be explained below. Under normal vehicle running conditions, the ball 48 does not move inertia, so the trigger Step portions 52A and 52B of block 52 and base portions 64B and 66B of ignition pins 64 and 66 The locked state with the device will never be released. Therefore, the activation device 34 remains inactive. hold

[0023] When the vehicle suddenly decelerates from this state, the ball 48 instantly undergoes a large inertial movement. . As a result, as shown in FIG. 5, the trigger block 52 is attached to the bias spring. The ball 48 is directed in the direction of inertial movement (direction of arrow A in FIG. 1) against the biasing force of the gear 58. and move. Therefore, the steps 52A and 52B of the trigger block 52 and the ignition pin 6 4 and 66 are released from the locked state with the bases 64B and 66B. Therefore, the ignition pin 6 4 and 66 are in the direction of separating from each other due to the biasing force of the compression coil spring 68, and the ball 48 and collides with the detonator 90. collision When the detonator 90 is ignited by It is burned inside. Therefore, a large amount of gas is generated and expands the bag body 22. . The inflated bag body 22 ruptures the airbag cover 20 at the thin wall portion 32, separating the occupant and the passenger compartment. and the ring wheel 18.

[0024] In this way, in this embodiment, the trigger block is moved by a single ball 48. 52 are disposed within this trigger block 52 in the direction away from each other and the balls 4 A pair of ignition pins 64 and 66 moving in a direction perpendicular to the inertial movement direction of 8 are locked. , and these ignition pins 64 and 66 are pressed by a single compression coil spring 68. Therefore, if the vehicle suddenly decelerates, the same inertial force will cause the same force to be applied. The pair of ignition pins 64 and 66 will move in response to the force. For this reason, after moving To make the ignition energy uniform when the ignition pins 64 and 66 collide with the detonator 90. I can do that. Moreover, since two ignition pins 64 and 66 are provided as before, Ignition redundancy in the airbag device 10 is ensured.

[0025] In addition, the cylinder 50, the ball 48, the trigger block 52, the bias spring 58 and ignition pins 64 and 66 are arranged. Because the structure eliminates bias pins, it requires fewer parts compared to conventional starting devices. The number can be reduced, and the activation device can be downsized.

[0026] Next, a modification of the starting device 34 will be described using FIG. 6. In addition, the startup device mentioned above Components that are the same as those in the housing 34 are given the same numbers and their explanations will be omitted.

[0027] As shown in FIG. 6, this starting device 70 has a T-shaped trigger 72. . The T-shaped trigger 72 includes a spherical support portion 72A that is in close contact with the ball 48, and a lower A base body 72B that is movable in the axial direction within the body 42 and a support portion 7 for these 2A and a connecting portion 72C that connects the base body 72B at right angles. Base body 72C A protrusion 74 corresponding to the protrusion 56 of the lower body 42 is formed at the lower end. , a bias spring 58 is wound in the same manner as in the embodiment described above. In addition, A rectangular hole 76 is formed in the connecting portion 72B, and a single compression coil is inserted into the rectangular hole 76. A coil spring 68 is passed through and presses and biases the pair of ignition pins 64 and 66.

[0028] This starting device 70 also operates in the same manner as the starting device 34. In this starting device 70, Since the base body 72B of the T-shaped trigger 72 slides on the inner peripheral surface of the lower body 42, the T-shaped The T-shaped block 72 can be reliably guided when the trigger 72 moves. In addition In the case of this modification, a coating etc. is applied to the inner peripheral surface of the lower body 42 to reduce friction. It is preferable to

[0029] In addition, in this embodiment, the ball 48, the trigger block 52, the bias spring 58, a pair of ignition pins 64, 66 and a compression coil spring 68 as a set of starting device 34; However, these functional components are not limited to these functional components within the activation device 34. The inertial movement of a single ball 48 allows multiple sets to be provided. The fire pins 64 and 66 receive the biasing force of a single biasing means to move the ball 48 in the direction of inertial movement. It can be applied to any relationship that moves in the direction perpendicular to . Ru.

[0030] Further, in this embodiment, two ignition pins 64 and 66 are arranged inside the trigger block 52. However, the number of ignition pins 64 and 66 is not limited to this, and a plurality of ignition pins 64 and 66 may be provided. The goblock 52 is lengthened in the direction of inertial movement of the ball 48, and a pair of ignition pins 64, 66 and compression coil spring 68 so as not to interfere with the other pair of ignition pins and compression coil springs 68. These ignition pins 64, 66 and another ignition pin are arranged in a plan view. The pins may be arranged in a cross shape.

[0031] Furthermore, in this embodiment, the activation device 34 to which the present invention is applied is installed in the airbag on the driver's seat side. Although the present invention is applied to the tracking device 10, it is not limited to this and may be applied to passenger seats such as the front passenger seat. Winding of the webbing retractor via wire, etc. when an airbag device is used or the vehicle suddenly decelerates. Applicable as an operating source for a so-called preload device that rotates the take-up shaft in the webbing winding direction. You may.

[0032]

[Effect of the idea]

As explained above, the starting device according to the present invention ensures the ignition redundancy of the system. However, it has the excellent effect of making the ignition energy of the ignition member uniform. have

[0033] In addition, the inflator equipped with the starting device according to the present invention has a short height dimension, and The time required from the ignition of the detonator to the combustion of the gas-generating substance can be shortened. It has this excellent effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a starting device according to a first embodiment of the present invention taken along a plane including an axis.

FIG. 2 is an exploded perspective view of the activation device of FIG. 1;

FIG. 3 is a sectional view showing the inflator equipped with the starting device of FIG. 1 taken along a plane including the axis.

4 is a schematic cross-sectional view showing an airbag device including the inflator of FIG. 3. FIG.

FIG. 5 is a sectional view corresponding to FIG. 1 showing a state in which the activation device of FIG. 1 is activated;

[Fig. 6] Fig. 1 showing a starting device according to a second embodiment of the present invention.
FIG.

FIG. 7 is a cross-sectional view of a conventional inflator taken along a plane including an axis.

FIG. 8 is a sectional view showing another conventional inflator taken along a plane including the axis.

[Explanation of symbols]

24 Inflator 34, 70 Starting device 48 Ball (inertial body) 64, 66 Ignition pin (ignition member) 68 Compression coil spring (biasing means) 90 Detonator 92 Explosive charge 94 Gas generating substance 94 (gas generating agent)

Claims (2)

[Scope of utility model registration request] [Claim 1] An inertial body that moves inertially when a vehicle suddenly decelerates;
A starter device comprising: an ignition member that moves due to inertial movement of the inertial body; and a biasing means for biasing the ignition member, wherein a plurality of the ignition members are provided and at least one pair of ignition members is provided. The starting device is characterized in that the directions of movement of the ignition members are opposite to each other, and the plurality of ignition members are urged by the same urging means and are moved by the inertial movement of the single inertial body. 2. The activation device disposed substantially in the center;
a detonator disposed on a movement trajectory of the ignition member of the starting device; a gas generating agent that generates gas when the detonator ignites; and a transfer agent communicating the detonator and the gas generating agent. , the inflator spouting the gas when the vehicle suddenly decelerates, the detonator being disposed between the booster and the starting device, and the detonator and the booster being arranged at a height of the starter. 2. The activation device according to claim 1, wherein the detonator and the booster are arranged in a plane perpendicular to the transverse direction, and each of the detonator and the booster is arranged on a concentric circle centered on the activation device. Inflator with device.