JPH04107152U - starting device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a starting device that is easy to manufacture even when the biasing force of a firing spring is increased. [Structure] A ball 44 and a disk 60 are provided as inertial bodies that move in response to vehicle deceleration. Only the ball 44 receives an air damping effect due to the gap D between it and the cylinder 40. The end portion 46A of the swing bar 46 is attached to the mass body 60.
The end 46B of the swing bar 46 is in contact with the bias pin 48, which is biased toward the front of the vehicle by the compression coil spring 56.
are in contact with each other. Hook portion 5 provided on the swing bar 46
0C is locked to an ignition pin 52 biased by a firing spring 54. In the activation device 28 described above, even when the biasing force of the firing spring 54 is increased, the weight of the disc 60 can be adjusted without increasing the diameter of the ball 44, which requires highly accurate surface processing. As a result, the locked state can be released, and the above objective can be achieved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a mechanical ignition type that ignites based on the movement of an inertial body when a vehicle suddenly decelerates. The present invention relates to a starting device used in an airbag device, etc.

0002

[Conventional technology]

A starting device 70 used in an airbag device or the like as an actuator has a diagram shown in FIG. As shown in FIG. 4, a ball 74 is housed within the cylinder 72. ball 74 One end of the swing bar 76 is in contact with the swing bar 76 . The surface of the ball 74 and the inside of the cylinder 72 A gap is provided between the ball 74 and the wall, and this gap causes negative pressure to act on the ball 74. (damping function). The inner diameters of the ball 74 and cylinder 72 are Processed with high precision to ensure ping function. In the middle part of the swing bar 76 , the trigger shaft 78 is fixed. Under normal conditions, the trigger shaft 78 is locked to the flange 80A of the ignition pin 80, and the trigger shaft of the flange 80A A firing pin 88 is arranged on the side opposite to the foot 78, and a firing pin 88 is arranged on the side opposite to the foot 78. It is energized toward the detonator 86. The trigger shaft 78 rotates counterclockwise in Fig. 4. Possibly supported.

0003 The other end of the swing bar 76 has a bias pin 84 equipped with a bias spring 82. is being pressed by.

0004 When the vehicle suddenly decelerates, the ball 74 resists the biasing force of the bias spring 82 and loses inertia. The force moves in the direction of arrow A, which is the forward direction of the vehicle, and rotates the swing bar 76 counterclockwise. Then, the ignition pin 80 is released from being locked by the trigger shaft 78. By this The ignition pin 80 moves and hits the detonator 86, igniting the detonator 86 and causing a bug (not shown). ) is designed to expand.

[0005]

[Problem that the idea aims to solve] By the way, the detonator 86 is designed to operate only when the ignition pin 80 hits it strongly. There is a request to do so. In order to satisfy this request, it is necessary to It is necessary to strengthen the urging force of the ring 88. In this case, the ball may be damaged due to driving on a rough road, etc. 74 moves in the inertial movement direction (direction of arrow A in FIG. 4) and the swing bar 76 rotates The bias spring 82 is attached so that sufficient return force of the swing bar 76 can be obtained. We need to strengthen our forces. For this reason, the diameter of the ball 74 is increased and the ball 74 By increasing the weight of the ball 74 or using a denser material for the ball 74, The force acting on the swing bar 76 is increased by the inertial movement of the actuator 70. It is necessary to ensure the degree of

[0006] However, using a ball 74 with a large diameter causes the following problems. In other words, as the diameter of the ball 74 increases, the ball 74 can be held with high precision over a wide area. It is necessary to process it once. Also, as the ball 74 becomes larger, the diameter of the cylinder 72 also increases. It is necessary to make the cylinder 72 larger, and the inner wall of the cylinder 72 is also machined with high precision over a wide area. There is a need to. Therefore, there is a problem that the starting device 70 is not easy to manufacture. Ru.

[0007] The present invention takes the above facts into account and increases the biasing force of the firing spring. The purpose is to provide an activation device that is easy to manufacture even in cases where the device is easily manufactured.

[0008]

[Means to solve the problem]

The activation device according to the present invention is activated when the vehicle suddenly decelerates and activates the actuator. A starting device equipped with an actuating means for actuating the actuator when a high load is applied for less than a predetermined time. The amount of movement in the inertial movement direction is reduced to less than a predetermined amount by negative pressure, and the high load is When the vehicle suddenly decelerates for a predetermined period of time or more, the inertial movement causes the inertia to be greater than the predetermined amount. a first inertial body that is moved in the direction of movement; and a first inertial body that moves together with the first inertial body when the vehicle suddenly decelerates. a second inertial body that inertically moves to the actuator; The first and second habitual conditions are set to a non-activated state where the vehicle is not activated, and the first and second habits are activated when the vehicle suddenly decelerates. a trigger member that activates the actuating means based on inertial movement of the body. It is characterized by

[0009]

[Effect]

According to the starting device configured as described above, when the vehicle is running normally, the first inertial body When a high load is applied for less than a predetermined time, the inertial movement of the first inertial body is caused by negative pressure. is reduced to less than a predetermined amount. In this state, the trigger member deactivates the actuating means. , and therefore the actuator does not operate.

0010 When a vehicle suddenly decelerates, a high load acts on the first inertia body for a predetermined period of time or more, causing the first inertia body to The body moves in the direction of inertial movement by a greater amount than the predetermined amount. At this time, the second inertial body also moves inertially together with the first inertial body. This causes the actuation means to be activated by the trigger member. The actuator is activated by the activation means. this In this case, in addition to the inertial movement of the first inertial body, the inertial movement of the second inertial body is also applied to the trigger member. It acts as a force for activating the actuating means. Therefore, the actuation means The diameter of the first inertial body, even if a large force is required to bring the The required size can be obtained by simply adjusting the weight of the second inertial body without changing the You can gain strength. Therefore, the first component involved in damping, which requires high-precision machining, The machining area of the inertial body can be reduced. Therefore, in order to put the actuation means into operation, Even if a large force is required, the starting device can be easily processed.

[0011]

【Example】

FIG. 3 shows an air bag device 10 to which a starting device 28 according to the present invention is applied. A partial cross-sectional view of the ring wheel 18 attached to the ring wheel 18 is shown.

0012 The air bag device main body 12 of the air bag device 10 has a steering wheel 18. Attach the base plate to the support plate 16 fixed to the hub portion 18A with bolts 13, etc. By fixing 14, it can be attached to the steering wheel 18. It has become. A release pin 19 is protruded from approximately the center of the support plate 16. There is. An air bag body 20 and an air bag cover 22 are mounted on the base plate 14. , an inflator 24 is attached.

[0013] The air bag body 20 is folded onto the passenger side of the base plate 14 (upper side in FIG. 3). It is placed in a closed state. This air bag body 20 has an edge on the opening side that is a base plate. It is attached to the approximate center of the seat 14 via a ring plate 26. ringpu The rate 26 is tightened to the base plate 14 with bolts (not shown), and the air The opening side edge of the bag body 20 is pressed against the base plate 14.

[0014] The air bag cover 22 has a base plate disposed on the passenger side of the base plate 14. An airbag body 20 is stored between the airbag and the airbag 14. This air bag cover 22 has a frame-shaped core metal (not shown) embedded around it, and is attached by rivets etc. through the core metal. It is attached to the base plate 14.

[0015] A thin wall portion 22A is formed at the portion of the air bag cover 22 that faces the base plate 14. It is designed to be easily broken at this part.

[0016] The inflator 24 has a cylindrical shape and is passed through a circular hole in the center of the base plate 14. A portion of the airbag body 20 is inserted into the airbag body 20. inflator 24 is a flange portion 24A on the surface of the base plate 14 on the side opposite to the passenger (lower side in FIG. 3). Therefore, it is fixed. This inflator 24 is activated by a starting device 28. A gas generating substance 30 to be initiated is enclosed. Opposed to the crew of inflator 24 As shown in FIG. 2, a circular hole 25 is formed on the side, and the inner wall of the circular hole 25 is A thread is formed. The activation device 28 has a male thread formed on the outer periphery that is connected to the female thread. It is fixed to the inflator 24 via a cylindrical support ring 64 screwed onto the inflator 24. ing.

[0017] The gas-generating substance 30 decomposes through combustion and releases a large amount of gas, which can be used to The abutment bag 20 is inflated. Horse mackerel as gas generating substance 30 Substances containing sodium chloride are used.

[0018] As shown in FIG. 1, a detonator 32 is disposed outside the starting device 28. When the gas is ignited, an ignition agent (not shown) is ignited, and the gas generating substance 30 (shown in FIG. 3) is ignited. is set to burn.

[0019] The activation device 28 shown in FIG. It is divided into a lower case 38 and an upper case 42, which are divided by a plane. Upper case 42 Inside the upper case is a ball 44 as the first inertial body of the mechanically ignited air bag sensor. Two of them are arranged at symmetrical positions with respect to the axis of the base 42. Each ball 44 and The related parts are symmetrical, so only one will be explained.

[0020] The ball 44 is inserted into a cylindrical cylinder 40, and the cylinder 40 is , is fixed in the upper case 42 so that its axis is parallel to the axis of the upper case 42. Ru. A gap D is formed between the surface of the ball 44 and the inner wall of the cylinder 40. Ru. As a result, negative pressure acts on the ball 44, and when a high load is applied for less than a predetermined time, The inertial movement of the ball 44 is made less than a predetermined amount. On the other hand, high loads When the weight acts for more than the predetermined time (when the vehicle suddenly decelerates), the first inertial body It is configured to move in the inertial movement direction by a larger amount than the predetermined amount.

[0021] A disk 60 as a second inertial body is provided in the direction of inertial movement of the ball 44. There is. The disc 60 is formed into a disc shape, and is located inside the lower case 38 side of the upper case 42. The entire outer peripheral surface 62 is placed close to the wall and can only be moved in the direction of arrow B. It is. The gap between the outer peripheral surface 62 and the inner wall of the upper case 42 is between the ball 44 and the cylinder. 40, the air damping effect does not occur. In addition, disk 6 It is also possible to provide a notch or through hole in 0 to prevent the air damping effect. can. Further, the disc 60 is in contact with the lower end surface of the cylinder 40 and the ball 44. It is arranged in a state. The disc 60 provides inertia to the inner wall of the upper case 42 when the vehicle suddenly decelerates. It slides in the moving direction and moves integrally with the ball 44. disk 60 is the weight of the ignition pin 5, which will be described later, when the ball 44 inertially moves by the predetermined amount. The weight is set to such a level that the locking state between the collar portion 52A of No. 2 and the hook portion 50C is released. There is.

[0022] On the surface of the disk 60 on the lower case 38 side, along the boundary between the lower case 38 and the upper case 42, One end 46A of the swing bar 46 is in contact with the swing bar 46. This swing bar 46 is disposed at the other end 46B with its axial direction facing the axial direction of the upper case 42. The end portion of the bias pin 48 on the lower case 38 side is in contact with the bias pin 48 .

[0023] The half of the bias pin 48 on the air bag body 20 side (upper side in FIG. 1) is a small diameter portion 48. It is A. A compression coil spring 56 is wound around this small diameter portion 48A. The end of the compression coil spring 56 on the air bag body 20 side is connected to the lower case 38 and the upper case 4. It is in contact with an outer cover 57 that holds 2.

[0024] Therefore, the compression coil spring 56 is connected to one side of the swing bar 46 via the bias pin 48. The end portion 46A of the ball 44 is urged toward the ball 44 side. The biasing force of the compression coil spring 56 is The ball 44 is moved in the direction of inertial movement due to the vehicle traveling on a rough road, etc., and the swing bar 46 is moved in the direction shown in FIG. 1. When the swing bar 46 is rotated slightly counterclockwise, the swing bar 46 can be successfully returned to its original position. is set to On the other hand, the weight of the disk 60 is reduced due to the movement. The bush shaft 46 is rotated counterclockwise in FIG. 1 against the biasing force of the compression coil spring 56. In addition, the weight is set such that the engagement with the flange portion 52A can be released.

[0025] A drive shaft 50 is located midway in the longitudinal direction of the swing bar 46 . It is installed perpendicular to the axial direction. Further, the drive shaft 50 is connected to the ball 4. 4 is fixed in a direction perpendicular to the moving direction of the drive shaft 50, and both ends of the drive shaft 50 is rotatably supported by the lower case 38 and the upper case 42. Therefore, the swing bar -46 is rotatable around the drive shaft 50.

[0026] The upper case 42 of the hook portion 50C provided at the center of the drive shaft 50 The opposite end 50D is the flange of the ignition pin 52 arranged in the axial direction of the lower case 38. It is locked to the portion 52A. In addition, the hook portion 50 of the collar portion 52A of the lower case 38 A firing spring 54 is arranged on the side opposite to C, and the flange portion 52 A is urged toward the upper case 42.

[0027] Due to the rotation of the drive shaft 50, the end portion 50D of the hook portion 50C is moved to the collar portion 5. 2A, the tip 52B of the ignition pin 52 is attached to the firing spring 54. It collides with the detonator 32 by the urging force of . Fire ring spring 5 The biasing force No. 4 is set large so that the ignition pin 80 strongly hits the detonator 32. Ru.

[0028] Further, the end portion 50D of the hook portion 50C of the drive shaft 50 is connected to the bias pin 4. The ignition pin 52 is tightened by the biasing force of the compression coil spring 56 wound around the small diameter portion 48A of the ignition pin 52. It is designed to prevent it from accidentally coming off from the flange 52A.

[0029] As shown in FIG. 1, a coil is provided on the opposite side of the end 46A of the swing bar 46 from the ball 44. A spring 76 is arranged. Is the coil spring 76 the coil part or the passenger side of the coil part? and a hook portion protruding in the radial direction. Although the hook part is not shown, the coil The lower side is locked to a release pin (not shown) inserted into the shaft center of the starter, and Its tip is connected to the other ball (in the figure, the ball 44 is centered on the axis of the starting device). and is located at the end opposite to the passenger). The airbag device is Before it is attached to the bearing wheel, this coil spring 76 Inertial movement of the roll and rotation of the drive shaft 50 are prevented. After assembly The release pin is pressed by the release pin 19 and resists the biasing force of the coil spring 76. By moving to the side opposite to the passenger, the hook part is retracted from the above position and the activation device is activated. 28 is enabled.

[0030] Next, the operation of this embodiment will be explained. When attaching the starting device 28 to the inflator 24, the support ring 64 With the starting device 28 attached to the support ring 64 formed in the circular hole 25, Screw onto the female thread. In this case, the activation device 28 of this embodiment is as shown in FIG. , protrudes downward in FIG. 2 (in the direction opposite to the occupant of the inflator 24). however , since the disk 60 (FIG. 1) is arranged in the direction of inertial movement of the ball 44, the radial direction Therefore, the starting device 70 does not become larger. Therefore, the conventional inflator 24 can be used as is. In the normal state of the vehicle, the end portion 46B of the swing bar 46 is biased as shown in FIG. The ball 4 is strongly urged toward the front of the vehicle via the pin 48. 4 and the disc 60 are urged toward the rear of the vehicle by the end 46A of the swing bar 46. There is. Further, the end portion 50D of the hook portion 50C is connected to the vehicle by a compression coil spring 56. The flange portion 52A of the ignition pin 52, which had been urged in the rearward direction, is locked. of the vehicle Under normal conditions, a high load with a short duration is applied, so negative pressure causes the first inertial body to The amount of movement in the inertial direction is less than a predetermined amount. Therefore, the hook part 50C and the brim The locked state of the portion 52A is maintained, so that the airbag body does not inflate.

[0031] Here, when the vehicle suddenly decelerates, the ball 44 is inertially moved by a predetermined amount or more. . Further, the disk 60 moves inertia in the direction of arrow B in FIG. 1 together with the ball 44, and the swinging system Push the end 46A of the shaft 46 counterclockwise in FIG. In this case, the rocking A force generated by the inertial movement of the ball 44 and an inertial movement of the disk 60 is applied to the shaft 46. The resultant force of the forces acting on the Therefore, it resists the strong urging force of the compression coil spring 56. The swing bar 46 rotates in the counterclockwise direction in FIG. The stopped state is released. As a result, the ignition pin 52 moves toward the rear of the vehicle, and the detonator Collision with 32. The detonator 32 is ignited by this collision, thereby emitting gas. Biological material is burned. As a result, the airbag body 20 is inflated and the occupant and steering It is interposed between the ring wheel 18 and the ring wheel 18 . This allows the occupants to avoid sudden vehicle deceleration. Reliably protected from impact.

[0032] In the above embodiment, the locking force between the collar 52A of the ignition pin 52 and the hook portion 50C is Even if the diameter of the ball 44 involved in damping is large, the diameter of the ball 44 involved in damping should be increased. By adjusting the weight of the disc 60 that does not participate in damping, the locked state can be maintained. Can be canceled. Therefore, the surface of the ball 44 and the inner wall of the cylinder 44 are covered over a large area. The starting device 28 is easy to manufacture because there is no need to process it with high precision over the entire process. .

[0033] In the above embodiment, the disk 60 is formed in the shape of a disk, but it may also be formed in the shape of a truncated cone. It is often accommodated in the gap formed between the ball 44 of the cylinder 40 and the swing bar 46. It may have any shape as long as it is possible. In addition, in the above, the ball 44 and Although the disks 60 are provided coaxially, they can also be arranged parallel to each other. Sara In the above embodiment, the case where the starting device is applied to an airbag device is explained. However, the preloader (device that tightens the seat belt urgently when the vehicle suddenly decelerates) can also be applied.

[0034]

[Effect of the idea]

As explained above, in the starting device according to the present invention, the actuating means is activated. to obtain a starting device that is easy to manufacture, even when large forces are required. It has the excellent effect of being able to

[Brief explanation of drawings]

FIG. 1 is a sectional view of a starting device according to an embodiment of the present invention.

FIG. 2 is a partially sectional view showing a state in which the starting device is attached to the inflator.

FIG. 3 is a schematic diagram showing a state in which an inflator with a built-in starting device is attached to a steering wheel.

FIG. 4 is a sectional view showing a conventional starting device.

[Explanation of symbols]

28 Starting device 44 ball 46 Swing bar 48 Lock pin 50 drive shaft 52 Ignition pin 54 Compression coil spring 60 disk

Claims (1)

[Scope of utility model registration request] 1. An activation device comprising an activation means that is activated when a vehicle suddenly decelerates to activate an actuator, wherein the amount of movement in the inertial movement direction is reduced by negative pressure when a high load is applied for less than a predetermined time. a first inertial body that is moved in the direction of inertial movement by a greater amount than the predetermined amount due to inertial movement when the vehicle suddenly decelerates and is subjected to a high load for more than the predetermined amount of time; a second inertial body that inertially moves together with the inertial body; and a second inertial body that causes the actuating means to be in an inactive state in which the actuator is not actuated in normal times, and that causes the inertial movement of the first and second inertial bodies when the vehicle suddenly decelerates. a trigger member that activates the actuating means based on the trigger member.