JP2593591Y2 - Collision sensor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision sensor which is used in a seat belt pretensioner device or an airbag device which is operated by a power generating means or a mechanical ignition means and which is sensitive to an impact at the time of a vehicle collision. is there.

[0002]

2. Description of the Related Art Conventionally, in a mechanical or mechanical ignition type seat belt pretensioner device, a mechanism for operating a device by releasing a spring enclosed in the device and utilizing the spring force is particularly disclosed. Kaihei 2-256
There is one disclosed in Japanese Patent Publication No. 550. The sensor installed in this device holds the spring force of the biased spring by a link mechanism, and pushes up the link mechanism by the movement of the inertial mass body to release the connection of the link mechanism and release the spring. .

[0003]

In the prior art, a sensor that responds to an impact at the time of a vehicle collision uses a link in which an inertial mass body acts against a spring force of a spring as an energy generating means applied to a link mechanism. Since the mechanism is released and the spring is released, the collision sensitivity varies due to the spring force applied to the link mechanism and the variation in the accuracy of the link mechanism, causing a problem in reliability. In order to increase the sensitivity and stabilize the operating characteristics of the sensor, it is necessary to improve the accuracy of these factors. As a result, in the conventional example, a high-precision component is required, and there is a problem that the device becomes expensive.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a spring force as an energy generating means and a power means for releasing the same. It is an object of the present invention to provide a collision sensor that can be provided at a low cost without requiring high-precision components by providing the components separately and providing a means for adjusting the respective balances.

[0005]

In order to achieve the above object, a collision sensor according to the present invention comprises a first and a second link plate having one end connected to each other, and a first and second link plates connected from one surface of the link plate. A compression spring that presses the portion and that can adjust the pressing force, and a swingable inertial mass body that supports the connecting portion against the pressing force of the compression spring from the other surface of the link plate, The other end of the second link plate abuts against a fixed surface, the other end of the first link plate abuts against a stopper of an energy generating device, and the inertial mass swings when a predetermined impact force is sensed. Then, the support of the connecting portion between the first link plate and the second link plate is released, and the pressing force of the compression spring releases the connecting relationship between the first link plate and the second link plate. It is to be released.

[0006]

The connecting portion of the first and second link plates is in contact with the inertial mass at its lower part, and is pressed by the compression spring at its upper part, so that the contact state is maintained. And the second
The other end of the link plate contacts the fixed surface, and the other end of the first link plate contacts the stopper of the energy generating device. Then, when a predetermined impact force is sensed,
The inertial mass swings and no longer supports the connecting portion, and the pressing force of the compression spring releases the connecting relationship between the two link plates and releases the stopper of the energy generating device.

[0007]

An embodiment will be described with reference to the drawings. 1 and 2 show a collision sensor used in a seat belt pretensioner device operated by mechanical ignition means, but this collision sensor can also be used in an airbag device operated by similar means. .

Reference numeral 10 denotes a bracket attached to an appropriate portion of a casing (not shown) of the seat belt pretensioner device. At both ends of the bracket 10, a hollow cylindrical sensor housing 11 and a closed cylindrical cylinder 1
The sensor housing 11 and the cylinder 12 are continuous with each other.

Reference numeral 13 denotes a shaft which is suspended in the center of the sensor housing 11. An inertia mass body 14 that senses an impact force at the time of a vehicle collision is swingably supported on the shaft 13. This inertial mass body 14 is provided with the bias spring 1
5, and is urged in a direction (counterclockwise in FIG. 1) in which it engages with the joint member 18. The base end of the bias spring 15 is attached to the wall of the sensor housing 11. Reference numeral 17 denotes a projection formed on the upper part of the inertial mass body 14. The tip of the projection 17 is in contact with the bottom of the joint member 18 to hold the joint member 18 in a fixed position, thereby preventing the joint member 18 from jumping out.

An opening 19 is provided above the sensor housing 11.
Is formed. Reference numeral 20 denotes a spring case which is slidably fitted in the opening 19. A compression spring 21 that urges the joint member 18 in the pressing direction is accommodated in the spring case 20. Reference numeral 22 denotes a lid of the spring case 20. Screws are engraved on the inner peripheral wall surface of the lid 22 and the outer peripheral wall surface of the opening 19, respectively, and the lid 22 is screwed into the opening 19. Then, according to the rotation of the lid 22,
The pressing force of the compression spring 21 on the joint member 18 can be adjusted. These spring case 20, compression spring 21, and lid 22 are connected to a link plate 23, which will be described later.
It functions as adjusting means for adjusting the balance of the 24 and the like.
The bottom of the spring case 20 is in contact with the head of the joint member 18.

On both sides of the joint member 18, engagement recesses 25, 25 are provided. One end of the first link plate 23 is engaged with one engagement recess 25, and one end of the second link plate 24 is engaged with the other engagement recess 25. Thus, the first link plate 23 and the second link plate 2
4 have their one ends connected to each other. The other end of the first link plate 23 is engaged with a locking recess 27 formed at the tip of the stopper 26. The other end of the second link plate 24 is engaged with a fixed surface, for example, a corner of the sensor housing 11. Both ends of each of the first link plate 23 and the second link plate 24 are formed in a shape protruding into a shape that fits into the concave shape of the mating member to be engaged.

The arrangement position of the first link plate 23, the joint member 18, and the second link plate 24 is not such that the cross section is straight, but the joint member 18 is biased toward the spring case 20 side. Arrange them so that they have a slightly letter shape. These first link plates 2
3, the joint member 18, and the second link plate 24
Constitute a trigger. And the first link plate 2
The connecting portion between the third link plate 24 and the second link plate 24 is pressed from one surface by the compression spring 21 and is supported by the inertial mass body 14 from the other surface against the pressing force of the compression spring 21.

The stopper 26 is connected to the first link plate 23
1 (clockwise in FIG. 1). Reference numeral 28 denotes a bottomed cylindrical spring housing cylinder. A compression coil spring 29 is housed inside the spring housing tube 28, and the spring housing tube 28 is urged toward the cylinder portion 12. However, in a normal state, the bottom of the spring housing cylinder 28 abuts and is locked by the locking claw 30 formed at the base end of the stopper 26. It is in contact with the side wall.

Reference numeral 31 denotes an ignition pin attached to the bottom of the spring housing cylinder 28. Reference numeral 32 denotes a gas generator provided at an intermediate portion between the sensor housing 11 and the cylinder 12.
The gas generator 32 communicates with the piston 33 on the cylinder section 12 side. And when the sensor is activated,
The latching relation between the stopper 26 and the latching claw 30 of the stopper 26 is released, and the spring accommodating cylinder 28 is moved in the direction of the cylinder portion 12 by the spring force of the compression coil spring 29, and the ignition pin 31
2, the gas generator 32 is ignited, and the cylinder 1
2 is released.

Reference numeral 34 denotes a wire having one end wound around a reel (not shown) of the seat belt pretensioner device. The other end of the wire 34 is
5 is connected to the head 36. The head 36 keeps the cylinder 12 airtight and is slidable in the cylinder 12. Then, the end of the wire 34, the head 3
6 and the rod 35 following the head 36 are housed in the cylinder 12.

Thus, in a normal state, the bottom of the spring housing cylinder 28 is engaged with the locking claw 30 of the stopper 26, and the opening of the spring housing cylinder 28 is in contact with the side wall of the sensor housing 11. Have been. One end of the first link plate 23 engages with the engaging recess 27 of the stopper 26, and the other end engages with the engaging recess 25 of the joint member 18. One end of the second link plate 24 engages with the joint member 18. And the other end thereof are engaged with the corners of the sensor housing 11, respectively. The joint member 18 has an upper part in contact with the spring case 20 and a bottom part in contact with the projection 17 of the inertial mass body 14. The first link plate is formed by the spring force of the compression spring 21 of the spring case 20, the force applied from the compression coil spring 29 via the stopper 26, and the support force of the inertial mass body 14 acting on the joint member 18. 23, the joint member 18, and the second link plate 24 maintain balance. By adjusting the pressing force of the compression spring 21 by rotating the lid 22 of the spring case 20, the load applied to the joint member 18 can be adjusted, so that this balance can be adjusted freely.

When a large acceleration or deceleration at the time of a vehicle collision is applied, the inertial mass 14 is biased by the inertia force to the bias spring 1.
5 and counterclockwise in FIGS. 1 and 2, the projection 17 of the inertial mass body 14 and the joint member 1
The contact relationship with the compression spring 2 of the spring case 20 is released.
Due to the force of 1, the joint member 18 falls. As a result, the first link plate 23 and the second link plate 2
The engagement relationship between the joint member 4 and the joint member 18 is released, and the stopper 26 rotates clockwise in FIGS. 1 and 2. Then, the engagement relationship between the locking claw 30 of the stopper 26 and the spring accommodating cylinder 28 is released.

Next, the spring accommodating cylinder 28 moves in the direction of the cylinder 12 by the spring force of the compression coil spring 29.
Then, the ignition pin 31 comes into contact with the gas generator 32, the gas generator 32 is ignited, and the gas is released to the cylinder portion 12. For this reason, the rod head 36 is pushed upward by the rise of the pressure in the cylinder portion 12 kept airtight, and the wire 34 is pulled. As a result, the seat belt pretensioner device operates due to the pulling force of the wire 34, which is wound and attached at one end to the reel.

FIGS. 3 to 6 show a collision sensor used in the seat belt pretensioner device operated by the power generating means according to the second embodiment. This collision sensor is also operated by an airbag operated by the same means. It can also be used for devices.

Reference numeral 40 denotes a bracket attached to an appropriate portion of a casing (not shown) of the seat belt pretensioner device. In the bracket 40, an inertial mass body 41 for sensing an impact force at the time of a vehicle collision is swingably attached. The tip of a bias spring 42 is attached to the inertial mass 41. The base end of the bias spring 42 is attached to the inner wall surface of the bracket 40. Reference numeral 43 denotes an engagement portion formed on the inertial mass body 41. The engaging portion 43 is in contact with the leg portion 45 of the joint member 44, and holds the joint member 44 at a fixed position to suppress the joint member 44 from jumping out.

An opening 46 is formed in the upper part of the bracket 40. Reference numeral 47 denotes a spring case which is slidably fitted in the opening 46. A compression spring 48 that urges the joint member 44 in the pressing direction is accommodated in the spring case 47. Reference numeral 49 denotes a lid of the spring case 47.
Screws are engraved on the inner peripheral wall surface of the lid 49 and the outer peripheral wall surface of the opening 46, respectively, and the lid 49 is screwed into the opening 46. These spring case 47, compression spring 48,
The lid 49 functions as adjusting means for adjusting the balance of link plates 50, 51 and the like described later. The bottom of the spring case 47 is in contact with the head of the joint member 44.

On both sides of the joint member 44, engagement recesses 52, 52 are provided. One end of the first link plate 50 is engaged with one engagement recess 52, and one end of the second link plate 51 is engaged with the other engagement recess 52. The other end of the first link plate 50 engages with a locking recess 54 formed at the tip of the stopper 53,
The other end of the second link plate 51 is engaged with a corner 55 of the bracket 40. Both ends of each of the first link plate 50 and the second link plate 51 are formed in a shape protruding into a shape that fits into the concave shape of the mating member to be engaged.

The arrangement position of the first link plate 50, the joint member 44, and the second link plate 51 does not make the cross section straight, but biases the joint member 44 toward the spring case 47 side. Arrange them so that they have a slightly letter shape. These first link plates 5
0, joint member 44, and second link plate 51
Constitute a trigger.

The stopper 53 is pivotally supported on a shaft 56 laid on the bracket 40. The stopper 53 is urged in a direction (clockwise in FIG. 3) in which the stopper 53 is engaged with the first link plate 50. At the base end of the stopper 53, a locking claw 57 is provided.
With the head 59.

A wire 60 has one end wound and attached to a reel (not shown) of the seat belt pretensioner device. Then, when the sensor is operated, the wire 60 is pulled, and a sudden turning power is applied to the reel, so that the seat belt pretensioner device is operated. The other end of the wire 60 is connected to the rod 5
8 is connected to the head 59. Reference numeral 61 denotes a coil spring for pulling and driving the rod 58 when the sensor operates. The coil spring 61 and the rod 58
It is housed in a cylinder (not shown).

Thus, under normal conditions, one end of the first link plate 50 is
And the other end engages with the engaging recess 52 of the joint member 44, respectively. One end of the second link plate 51 is engaged with the engaging recess 52 of the joint member 44, and the other end is a corner 55 of the bracket 40. Are engaged respectively. Joint member 44
The upper part thereof is in contact with the spring case 47, and the leg part 45 thereof is in contact with the engaging part 43 of the inertial mass body 41. And
Due to the spring force of the compression spring 48 of the spring case 47 acting on the joint member 44, the force applied from the coil spring 61 via the stopper 53, and the support force of the inertial mass body 41, the first link plate 50 The member 44 and the second link plate 51 maintain the balance.
By adjusting the pressing force of the compression spring 48 by rotating the lid 49 of the spring case 47, the load applied to the joint member 44 can be adjusted, so that the balance can be adjusted freely. The head 59 of the rod 58 is locked by a locking claw 57 of the stopper 53.

When a large acceleration or deceleration at the time of a vehicle collision is applied, the inertial mass body 41
4 moves rightward in FIG. 4 against the urging force of FIG. 4, the contact between the engaging portion 43 of the inertial mass body 41 and the joint member 44 is released, and the force of the compression spring 48 of the spring case 47 causes The joint member 44 falls. Next, the engagement relationship between the first link plate 50 and the second link plate 51 and the joint member 44 is released, and the stopper 53 is moved to the position shown in FIG.
In the clockwise direction. Then, the engagement relationship between the locking claw 57 of the stopper 53 and the head 59 of the rod 58 is released. As a result, the rod 58 is pulled up by the coil spring 61, and the wire 60 is pulled. Then, the seat belt pretensioner device is operated by the pulling force of the wire 60 having one end wound and attached to the reel.

[0028]

The present invention is configured as described above, and the balance between the link plate and the joint member can be adjusted by the balance adjusting means. Therefore, high-precision components are not required, and the apparatus is inexpensive. And it can be made small.

[Brief description of the drawings]

FIG. 1 shows a collision sensor according to the present invention;
(A) is a sectional view, and (b) is a plan view of a trigger mechanism.

FIG. 2 is a cross-sectional view of the collision sensor in a state where an impact has been received.

FIG. 3 is a sectional view of a collision sensor according to a second embodiment.

FIG. 4 is a sectional view showing an operation process of a collision sensor according to a second embodiment.

FIG. 5 is a sectional view showing an operation process of a collision sensor according to a second embodiment.

FIG. 6 is a sectional view showing an operation process of a collision sensor according to a second embodiment.

[Explanation of symbols]

 10, 40 Bracket 14, 41 Inertial mass body 15, 42 Bias spring 18, 44 Joint member 20, 47 Spring case 21, 48 Compression spring 22, 49 Lid 23, 50 First link plate 24, 51 Second link plate 26 , 53 Stopper

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G01P 15/00 G01P 15/02 B60R 21/32 B60R 22/46 G01L 5/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A first and a second link plate having one end connected to each other, a compression spring for pressing the connection from one surface of the link plate to adjust the pressing force, and a link plate. A swingable inertial mass body that supports a connecting portion against the pressing force of the compression spring from the other surface of the first link plate, the other end of the second link plate abuts on a fixed surface, The other end of the link plate abuts against the stopper of the energy generating device, and when a predetermined impact force is detected, the inertial mass swings to release the support of the connecting portion between the first link plate and the second link plate. A collision sensor wherein the connection between the first link plate and the second link plate is released by the pressing force of the compression spring, and the stopper of the energy generating device is released.