JPH07323811A - Forced operation structure of mechanical ignition type sensor - Google Patents

Abstract

PURPOSE:To provide a forced operation structure of a mechanical ignition type sensor which can forcedly operate the sensor simply while the sensor is mounted on a vehicle when the vehicle is disused, is safe, and improves workability. CONSTITUTION:A shaft 56 which can press an ignition pin 24 by moving in the direction of axial line due to its rotational operation is arranged in an axial line portion of a safety lever 46. When a sensor is operated forcedly, the ignition pin 24 is pressed by the shaft 56, an engaging portion 40 of a trigger lever 36 is sheared to release the holding of the ignition pin 24, and the ignition pin 24 is operated. Thus, the forced operation of the sensor can be carried out simply by operating the shaft 56, is safe, and improves workability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced activation structure for a mechanical ignition type sensor used in an occupant protection device such as an air bag device and a pretensioner device.

[0002]

2. Description of the Related Art Conventionally, as one of occupant protection devices mounted on a vehicle, there is an airbag device for inflating a bag toward the occupant when the vehicle is suddenly decelerated.

There are various types of airbag devices,
For example, there are driver seats, passenger seats, etc. when categorized from the viewpoint of installation site, and mechanical ignition type when categorized from the viewpoint of ignition system
There is an electric ignition type. Hereinafter, a mechanical ignition type airbag device and an electric ignition type airbag device will be briefly described in comparison, taking an example of an airbag device for a driver's seat.

As elements common to both, an inflator having a gas generating agent or the like inside, a base plate to which the inflator is attached, a bag body attached to the base plate in a folded state, and the bag body to be stored between the base plate and There are pads that break and develop when the vehicle suddenly decelerates. On the other hand, although the two have different ignition systems (sensors) as described above, in the case of the mechanical ignition system, the sensor itself is arranged at the shaft core of the inflator.
This mechanical ignition sensor is basically an ignition pin that ignites a detonator, an inertial mass body that inertially moves due to a large acceleration, and a trigger that intervenes between the ignition pin and the inertial mass body to prevent movement of the ignition pin. It is composed of a lever, and when the vehicle decelerates suddenly, the inertial mass causes inertial movement to release the holding of the ignition pin by the trigger lever,
The ignition pin pierces the detonator with an urging force, whereby the gas generating agent burns.

Further, such a mechanical ignition type sensor is provided with a safety device for preventing malfunction during assembly and the like. This safety device includes a safety lever that engages with the inertial mass body that is moved by an inertial force and prevents the movement thereof regardless of the action of the inertial force. When the safety lever is engaged with the inertial mass body, the inertial mass body is forcibly prevented from moving as described above. ,
The malfunction of the sensor is prevented.

On the other hand, in the case of the electric ignition type sensor, the sensors themselves are arranged on both sides and the center of the front part of the vehicle body, and when one of the sensors senses a rapid deceleration of the vehicle, the axis of the inflator is passed through a determination circuit. The ignition device disposed in the section is energized, and the gas generating agent is burned.

By the way, when a vehicle provided with the above-described airbag device is scrapped, it is desirable to forcibly operate the airbag device before the vehicle body is crushed from the viewpoint of safety. In addition, from the viewpoint of safety and the reduction of work effort, it is rational to perform this work with the airbag device attached to the steering wheel.

In this case, in the case of the air bag device using the electric ignition type sensor, the worker can easily operate the air bag device by energizing the ignition device.
You can work safely and easily.

However, in the case of the air bag device using the mechanical ignition type sensor, a predetermined inertial force must be applied to the sensor. For this purpose, the operator operates the safety device of the airbag device to deactivate the sensor, removes the airbag device from the steering wheel, and then operates the safety device again to activate the sensor. After that, it becomes a very troublesome work of forcibly operating the airbag device.

This also applies not only to the airbag device but also to other occupant protection devices (for example, pretensioners) mounted on the vehicle.

[0011]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to force a mechanical ignition type sensor that can easily force a mechanical ignition type sensor to be forcibly operated while being mounted on a vehicle when the vehicle is scrapped. The purpose is to obtain an actuation structure.

[0012]

According to another aspect of the present invention, there is provided a forced ignition structure for a mechanical ignition type sensor, wherein an ignition pin for igniting a detonator is held by a trigger lever, and
A forced activation structure of a mechanical ignition type sensor that releases the ignition pin holding state of the trigger lever and ignites by an inertial mass body that moves by inertial force when a predetermined load acts, and is arranged to be engageable with the ignition pin. A force-pushing member for forcibly pressing the ignition pin by operating and moving from the outside to release the ignition pin holding state by the trigger lever is provided.

[0013]

In the forced activation structure of the mechanical ignition type sensor according to the first aspect of the present invention, the ignition pin is normally held by the trigger lever and separated from the detonator. When a large acceleration acts on the mechanical ignition type sensor, the inertial mass body inertially moves, the holding of the ignition pin by the trigger lever is released, the ignition pin moves, and the detonator is ignited.

On the other hand, when the mechanical ignition sensor is forcibly operated at the time of discarding the vehicle, when the forced pressing member is operated and moved from the outside, the forced pressing member forces the ignition pin. By pressing, the ignition pin holding state by the trigger lever is released. Therefore, the ignition pin moves and the detonator is ignited.

As described above, since the ignition pin is forcibly moved by the compulsory pressing member to ignite the detonator without applying a predetermined inertial force to the sensor, the mechanical ignition sensor is disposed when the vehicle is disposed of. For example, it is not necessary to remove, for example, an airbag device using the above-mentioned airbag device from the steering wheel after activating the safety device and dispose of the airbag device, and safety and workability are improved.

[0016]

1 is a sectional view showing the overall construction of a mechanical ignition sensor 10 according to an embodiment to which the present invention is applied, and FIG. 2 shows the construction of the main parts of the mechanical ignition sensor 10. Is shown in a schematic perspective view.

The mechanical ignition type sensor 10 has a case 12. The case 12 is formed in a cylindrical shape having a bottom wall 14 at one end, and a plate 16 is provided on the opening side of the cover 1.
It is fixed by 8 and sealed. A through hole 20 is formed on the bottom wall 14 of the case 12 on the axis line.
A cylindrical guide hole 22 is formed in the case 12.

An ignition pin 24 is arranged inside the case 12. The ignition pin 24 is composed of a main body 26 formed in a substantially cylindrical shape and a convex portion 28 formed integrally with the bottom wall 26A of the main body 26 so as to slide in the case 12 along the axis. By moving, the convex portion 28 can enter the through hole 20 formed in the bottom wall 14. The convex portion 28 protrudes from the through hole 20 to the outside when the ignition pin 24 (main body 26) is moved to the side of the bottom wall 14 of the case 12 most.

A firing spring 30 is arranged between the plate 16 fixed to the opening side of the case 12 and the ignition pin 24, and the ignition pin 24 is always provided in the through hole 20.
Is biased in the direction of.

An inertial mass body 32 is arranged in the guide hole 22 of the case 12. The inertial mass body 32 is formed in a substantially cylindrical shape, and is housed in the guide hole 22 so as to be movable along the axial direction. A bias spring 34 is arranged between the inertial mass body 32 and the plate 16 and always biases the inertial mass body 32 toward the bottom wall 14.

A trigger lever 36 is arranged between the inertial mass body 32 and the ignition pin 24. One end of the trigger lever 36 in the longitudinal direction is rotatably supported by a shaft 38. Further, the tip end of the trigger lever 36 is bent toward the ignition pin 24 to form an engagement portion 40,
The ignition pin 24 can be engaged. That is, when the trigger lever 36 rotates about the shaft 38, the engaging portion 40
Can approach or separate the ignition pin 24. In a state where the engaging portion 40 of the trigger lever 36 is engaged with the main body 26 of the ignition pin 24, the ignition pin 24 urged by the firing spring 30 is located at a position where the convex portion 28 is pulled out from the through hole 20. keeping.

The engaging portion 40 of the trigger lever 36 is
The strength is set so as to be sheared when a predetermined external force is applied.

On the side opposite to the ignition pin 24 near the tip of the trigger lever 36, a slide holding portion 42 is formed so as to project toward the inertial mass body 32. The slide holding portion 42 corresponds to the release hole 44 formed in the inertial mass body 32, and is configured to be able to enter the release hole 44 when the inertial mass body 32 moves. That is,
Normally, the inertial mass 32 is in a position closest to the bottom wall 14 of the case 12 by the bias spring 34,
In this state, the inertial mass body 32 is in contact with the slide holding portion 42 of the trigger lever 36, the engaging portion 40 of the trigger lever 36 engages with the body 26 of the ignition pin 24, and the ignition pin 24 is projected. The portion 28 is held at a position where it is pulled out from the through hole 20. Further, when the inertial mass body 32 moves in the direction away from the bottom wall 14, the inertial mass body 32 relatively moves in linear contact with the slide holding portion 42 of the trigger lever 36, and the slide holding portion 42 moves. It is configured to enter the release hole 44.

On the other hand, a safety lever 46 is arranged on the opposite side of the plate 16 from the ignition pin 24 (between the cover 18). The safety lever 46 is formed in a disc shape,
The plate 16 and the cover 18 rotatably support the shaft. Further, the safety lever 46 has an arm 4
8 is formed. The arm portion 48 penetrates the plate 16 and extends toward the inertial mass body 32, and a locking portion 50 is formed at the tip thereof. The locking portion 50 is circumferentially opposed to a locking groove 52 formed at the end of the inertial mass body 32, and is fitted and released when the safety lever 46 rotates by a predetermined angle. . In the state in which the locking portion 50 is fitted in the locking groove 52 (the state shown by the chain double-dashed line in FIG. 5), the inertial mass body 32 moves the safety lever 46 (the arm portion 4).
8), the axial movement of the inertial mass body 32 is allowed in the axial direction of the inertial mass body 32 when the locking portion 50 is pulled out from the locking groove 52 (the solid line in FIG. 5). This is the configuration.

A torsion coil spring 54 is arranged between the safety lever 46 and the plate 16, and the safety lever 46 is always provided in the direction in which the locking portion 50 enters the locking groove 52.
Is urged to rotate.

The shaft portion of the safety lever 46 is projected from the cover 18 to the outside, and the operation lever 58 is attached thereto. As shown in FIGS. 3 and 4, the operation lever 58 can be operated from the outside by the release device A. The release device A is arranged corresponding to the operation lever 58 itself, and can be engaged with the operation lever 58 and rotated by being pushed in the direction of arrow P in FIGS. 3 and 4. That is, normally the torsion coil spring 54
It is possible to rotate the safety lever 46 in a state in which the locking portion 50 has entered the locking groove 52 by the urging force of the locking lever 50 by the releasing device A so that the locking portion 50 is pulled out from the locking groove 52. This is a possible configuration.

Further, a shaft 56 as a forced pressing member is arranged at the axial center of the safety lever 46 so as to be movable in the axial direction. One end of the shaft 56 is the ignition pin 2
4 is opposed to the bottom wall 26A of the body 26, and the other end of the main body 26 protrudes from the shaft of the safety lever 46 to the outside. Further, a male screw portion 56A is formed at an axially intermediate portion of the shaft 56, and the male screw portion 56A is screwed into the female screw portion 17 locked to the plate 16. Therefore, the shaft 56 is rotated to operate in the axial direction (the ignition pin 2
4), so that the ignition pin 2
The bottom wall 26A of the main body 26 of No. 4 can be pressed in the direction away from the plate 16.

The mechanical ignition type sensor 10 having the above structure.
Is assembled in, for example, a gas generator (not shown) of an airbag device or a pretensioner device. The gas generator contains a gas generating agent, and further, a detonator 60 for igniting and burning the gas generating agent is arranged. The detonator 60 is located on the axis of the mechanical ignition sensor 10 when the mechanical ignition sensor 10 is assembled. Therefore, in this assembled state, Case 1
The second through hole 20 faces the detonator 60.
The projecting portion 28 of the ignition pin 24 that can project from is capable of colliding with the detonator 60.

Next, the operation of this embodiment will be described. In the mechanical ignition sensor 10 configured as described above, normally, as shown in FIG. 1, the ignition pin 24 is separated from the detonator 60 against the biasing force of the firing spring 30 (the through hole of the case 12). 20), the trigger lever 36 holds the ignition pin 24 by engaging the engaging portion 40 with the main body 26 of the ignition pin 24. Further, the inertial mass 32 is moved to the bottom wall 1 by the bias spring 34.
4, the inner peripheral wall abuts on the slide holding portion 42 of the trigger lever 36 to prevent the trigger lever 36 from rotating and the ignition pin holding state is maintained. is doing.

Further, in the safety device operating state (state in which the sensor cannot operate), the locking portion 50 of the safety lever 46 is fitted into the locking groove 52 of the inertial mass body 32, and this state is the torsion coil spring 54. Is maintained by the urging force of (indicated by a chain double-dashed line in FIG. 5). Therefore, in this state, even if a large acceleration acts on the mechanical ignition sensor 10, the inertial mass body 32 does not move (the slide holding portion 42 of the trigger lever 36 does not enter the release hole 44). ), Therefore, the trigger lever 36 does not rotate and the ignition pin holding state is not released.

On the other hand, the release device A operates the operation lever 58.
When the safety lever 46 is rotated against the biasing force of the torsion coil spring 54 by operating the
When 0 is pulled out from the locking groove 52 in the circumferential direction (the state shown by the solid line in FIG. 5), the inertial mass body 32 can move in the axial direction, and the safety device is inoperative (sensor operable state). Becomes

When a large acceleration acts on the mechanical ignition sensor 10, the inertial mass body 32 inertially moves toward the plate 16, and the release hole 44 corresponds to the rotation locus of the trigger lever 36. Slide holding part 4 of trigger lever 36
When 2 is opposed to the release hole 44 of the inertial mass body 32 and its holding is released, the trigger lever 36 is pressed by the ignition pin 24 urged by the firing spring 30 in the direction away from the ignition pin 24. Is rotated in a direction away from the ignition pin 24. As a result, the engaging portion 40 of the trigger lever 36 is separated from the main body 26 of the ignition pin 24 to release the holding of the ignition pin 24, so that the ignition pin 24 is moved in the axial direction by the urging force of the firing spring 30. Then, the convex portion 28 projects outward from the through hole 20.

As a result, the convex portion 28 of the ignition pin 24 collides with the detonator 60 and the detonator 60 is ignited. When the detonator 60 is ignited, the gas generating agent of the gas generator is ignited and combusted, and, for example, the air bag device and the pretensioner device are operated.

Here, in the mechanical ignition type sensor 10,
When the vehicle is discarded, it can be forcibly operated while it is still attached to the vehicle body.

That is, when the mechanical ignition sensor 10 is forcibly activated, the ignition pin 24 is moved when the shaft 56 is moved in the axial direction (direction approaching the ignition pin 24) by rotating the shaft 56 from the outside. It is forcibly pressed in the direction away from the plate 16. When a predetermined pressing force is applied, the engagement portion 40 of the trigger lever 36 is sheared and the holding of the ignition pin 24 is released. As a result, the ignition pin 24 moves by the urging force of the firing spring 30, the convex portion 28 collides with the detonator 60, the detonator 60 is ignited, and the gas generating agent of the gas generator is ignited and burned.

Thus, in the mechanical ignition type sensor 10,
The ignition pin 24 is forcibly moved by the shaft 56 without applying a predetermined inertial force to the sensor and the detonator 6
Since 0 is ignited, it is not necessary to remove, for example, an airbag device using the mechanical ignition type sensor 10 from the steering wheel after activating the safety device and disposing of the mechanical ignition sensor 10 when disposing of the vehicle. improves. Further, since the shaft 56, which is simply movable in the axial direction, is ignited by simply rotating the shaft 56 to move it in the axial direction when the sensor is forcibly activated, the mechanism is simplified.

[0037]

As described above, the forcibly operating mechanism of the mechanical ignition type sensor according to the present invention allows the mechanical ignition type sensor to be forcibly operated easily even when the vehicle is abandoned and remains attached to the vehicle. It also has an excellent effect that workability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of a mechanical ignition sensor according to an embodiment to which the present invention is applied.

FIG. 2 is a schematic perspective view showing a configuration of a main part of a mechanical ignition sensor according to an embodiment to which the present invention is applied.

FIG. 3 is a back view showing the correspondence relationship between the mechanical ignition type sensor and the releasing device according to the embodiment to which the present invention is applied.

FIG. 4 is a front view showing a correspondence relationship between a mechanical ignition sensor and a releasing device according to an embodiment to which the present invention is applied.

FIG. 5 is a plan view showing the relationship between the safety lever and the inertial mass body of the mechanical ignition sensor according to the embodiment to which the present invention is applied.

[Explanation of symbols]

 10 Mechanical Ignition Sensor 24 Ignition Pin 32 Inertial Mass Body 36 Trigger Lever 56 Shaft (Forced Pressing Member) 60 Detonator

Claims (1)

[Claims] 1. A machine for holding an ignition pin for igniting a detonator by a trigger lever, and releasing the ignition pin holding state of the trigger lever by an inertial mass body that moves by an inertia force when a predetermined load is applied to perform ignition. A forced actuation structure of an ignition sensor, which is disposed so as to be engageable with the ignition pin, is operated by an external force to forcibly press the ignition pin to hold the ignition pin by the trigger lever. A forced actuation structure for a mechanical ignition type sensor, which is provided with a forced pressing member for releasing.