JPS63306950A - Vehicle acceleration detecting device - Google Patents

Abstract

PURPOSE:To prevent erroneous operation by engaging a plurality of trigger means with a plurality of sensor weights which are displaceable in the directions in which acceleration and deceleration are effected, and by operating an energy means with the use of the trigger means when the plurality of sensor weights are displaced simultaneously in the same direction. CONSTITUTION:When a vehicle bumps so as to effect a deceleration exceeding a predetermined value, a pair of right and left pendulums (sensor weights) 21a swingably suspended from both side surfaces of a sensor body 20 in an acceleration sensor 12 are tilted forward by a inertia force, overcoming the urging force of a bias spring 36. Thereby hooks 34 of a pair of trigger arms 29 swingably journalled in a see-saw manner, are released from projections 33 on the pendulums 21a, 21b. Then, a restraining force acting upon a firing pin 24 is released so that the latter is launched toward a detonator 39 under the accumulated force of both coil springs 27, 28, and therefore, thrust explosive 38 is exploded. Thereby a seat belt is retracted by means of a drive device (not shown) to restrain a passenger.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is mainly applicable to devices such as devices that automatically tighten seatbelts or airbag devices, which prevent occupants from moving forward in the event of a collision. The present invention relates to a vehicle acceleration detection device for minimizing occupant protection.

<Prior Art> Automobile seats are provided with seat belts that restrain the movement of the occupant in order to prevent the occupant from being thrown forward in the event of a collision or the like.

These seat belts do not restrict normal driving movements and are preferably tensioned only when deceleration of a predetermined value or more is applied.
No. 553, etc., proposes a bri-loader device that tensions the seat belt only in the event of a collision. Further, US Pat. No. 4,580,810 discloses a device in which an airbag that rapidly inflates in the event of a collision is incorporated into a steering wheel to reduce the impact on an occupant.

<Problems to be Solved by the Invention> On the other hand, as collision detection devices for operating these occupant protection devices, devices that utilize the movement of a weight due to inertial force are often used; These collision detection devices must operate reliably at the specified deceleration and must not malfunction under normal conditions.Due to the special circumstances of their use, these collision detection devices must be tested for normal operation. extremely high reliability is required.

In view of the above circumstances, a main object of the present invention is to provide a vehicle acceleration detection device that is improved so that even higher operational reliability can be obtained.

<Means for Solving the Problems> According to the present invention, an object for a vehicle is to release energy stored in an energy storage means in advance when a predetermined acceleration or deceleration is detected. An acceleration sensing device comprising: an energy release means spring-biased in a direction for activating the energy storage means; supported for displacement along a direction of application of acceleration or deceleration; a plurality of spring-biased sensor weights; and a plurality of trigger means that respectively engage the plurality of sensor weights and hold the energy release means in an inoperative state, and the plurality of sensor weights are independent of each other. This is achieved by providing a vehicle acceleration sensing device characterized in that the energy release means is activated only when the plurality of sensor weights are simultaneously displaced in the same direction.

(Function) In this way, a plurality of acceleration or deceleration detection sections (for example, two systems) are usually provided, each consisting of a trigger means for holding the energy release means in a non-operating position and a sensor weight that engages with the trigger means. In this way, the probability of malfunction occurring can be effectively reduced, and the reliability of the operation can be further improved.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows the configuration around the seat belt to which the present invention is applied. The seat belt 3 is pulled out upward from the webbing winding device 2 fixedly installed at the bottom of the center pillar 1 in the vehicle interior. After passing through the through ring 4 attached above the center pillar 1, it is extended downward and the seat 5
The end portion 6 is attached to the rear side surface of the holder. A tongue boot plate 7 is provided between the through ring 4 and the end portion 6 of the seat belt 3 so as to be movable along the seat belt 3.

After the occupant seated on the seat 5 pulls out the seat belt 3 from the webbing retracting device 2, the tongue plate 7 is tightly attached to the buckle 8 attached to the side of the seat opposite to the attachment point of the seat belt end 6. By doing so, the seat belt 3 is stretched from the shoulders to the chest and waist of the occupant.

As shown in FIG. 2, the webbing retracting device 2 is an EL device that retracts and retracts the seat belt 3 during normal use.
The vehicle includes an R device 9, a traction device 10 for tightening the slack in the seatbelt 3 at the time of a collision, a drive device 11 for applying rotational force to the traction device 10, and an acceleration sensor 12 for detecting a collision.

3 and 4 show the acceleration sensor 12 in detail.

A pair of pendulums 21a and 21b serving as sensor weights are suspended from both sides of the sensor body 20 of the acceleration sensor 12 so as to be swingable about their upper ends as fulcrums.

These pendulums 21a and 21b are independently attached to the sensor body 20 so as not to interfere with the movement of the other.

A cylinder is provided in the intermediate portion of the sensor body 20 between the pendulums 21a and 21b so as to communicate between the end surfaces 20a and 20b of the sensor body 20 along the tangential direction to the swing locus of the pendulums 21a and 21b. A guide hole 22 having a shape is formed.

In the guide hole 22, a spring receiver 23 is provided at the opening on one end surface 20a side, and a firing pin 24 serving as an energy release means is inserted inside the spring receiver 23. The firing pin 24 consists of a pointed end 25 and a bottomed cylindrical plunger 26 that slides into the guide hole 22, and a first coil spring 27 with a small diameter contracted within the plunger 26, and an end of the plunger 26. A large-diameter second coil spring 28 is compressed between the guide hole 22 and the spring receiver 23, and is constantly elastically biased toward the opening on the other end surface 20b side of the guide hole 22.

Trigger arms 29a and 29b are pivotally supported between opposing surfaces of the sensor body 20 and both pendulums 21a and 21b, respectively, so as to be able to swing as a seesaw set. A pin 30 is provided protruding from one end of each of these trigger arms 29a, b. These pins 30 include both trigger arms 29a,
b has a partially arcuate shape in order to be able to swing over a predetermined range, and protrudes into a slit 31 that communicates with the guide hole 22 along a direction perpendicular to the axis of the guide hole 22. , pins 30 of both trigger arms 29a, b are adapted to engage with an engagement groove 32 formed between the tip 25 of the firing pin 24 and the plunger 26.

A hook-shaped hook 3 is provided at the other end of both trigger arms 29a, b.
4 are formed respectively, and are engaged with protrusions 33 protruding from the surfaces of both pendulums 21a and 21b on the sensor body 20 side. In this way, the hook-shaped hook 34 is attached to both pendulums 2.
1a and 1b, and at the same time the pin 30 engages with the firing pin 2.
By engaging with the engagement groove 32 of No. 4, the firing pin 24 is held in the guide hole 22 against the urging force of both coil springs 27 and 28.

A tongue piece 35 is formed radially outward at the end of each pendulum 21a, b facing the swing fulcrum. Bias springs 36 are compressed on the sides of the sensor body 20 facing the tongues 35 in a direction parallel to the axis of the guide hole 22, and keep the pendulums 21a and 21b in a predetermined direction at all times. It is strong. As a result, both trigger arms 2
Hooks 34 of 9a, b and protrusions 33 of both pendulums 21a, b
The engagement with is maintained at all times.

On both sides of the acceleration sensor 12 configured in this way,
A plate 37 is secured with screws.

Further, in the vicinity of the opening of the guide hole 22 on the other ground 2Ob side, a recommendation 38 is provided to provide propulsive force to the drive device 11, and a detonator 39 is provided to ignite the recommendation 38.

Next, the operation of the above embodiment will be explained with reference to FIG. 5.

When a vehicle collides and deceleration of a predetermined value or more is applied in the direction of travel, both pendulums 21a and 21b overcome the biasing force of the bias spring 36 due to their inertia and swing their lower ends forward. tilt like this.

As a result, when the hooks 34 of both trigger arms 29a, b are disengaged from the protrusions 33 of both pendulums 21a, b, the firing pin 24
The restraining force acting on the firing pin 24 is released, and the firing pin 24 is ejected toward the detonator 39 by pushing away the pins 30 of the trigger arms 29a and 29b due to the elastic force given by the coil springs 27 and 28. (Figure 5).

When the point 25 of the firing pin 24 hits the detonator 39, the recommendation 38
ignites, and the explosion pressure at this time applies thrust to the piston body incorporated in the drive device 11, and the seat belt 3
is drawn in.

Such a collision detection device must have high operational reliability and must be prevented from malfunctioning under normal conditions.Therefore, in the present invention, pendulums 21a and 21b as sensor weights, By providing two systems of trigger arms 29a and 29b, for example, even if there is a problem with either of the bias springs 30, there is no risk of an accidental firing, and the probability of malfunction occurring during normal operation is reduced. is planning to change.

Further, in the above embodiment, two coil springs 27 and 28 are provided in series as the springs that bias the firing pin 24, but by doing so, it is possible to Even if there is a problem, reliable operation can be achieved using the other spring. This spring is not limited to a coil spring, and may be a combination of different types of springs, for example.

Furthermore, the firing pin 2 is inserted in the tangential direction of the rotation locus of the pendulums 21a and 21b.
4, the operating direction of the firing pin 24 can be made to coincide with the direction of deceleration, and the stability of the firing pin 24 can be further improved.

Note that the present invention is equally applicable not only to the above-mentioned webbing winding device but also to an airbag device.

<Effects of the Invention> As described above, according to the present invention, it is possible to effectively eliminate the factors that cause the acceleration detection device to malfunction, and it has a great effect in improving the reliability of the acceleration detection device. can play.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram around a seat belt to which the present invention is applied. FIG. 2 is an overall view of the webbing winding device. FIG. 3 is a partially cutaway side view of one embodiment of the present invention. 4 is a front view showing the sensor body cut away along line IV-IV in FIG. 3. FIG. FIG. 5 is an explanatory diagram showing the operating state of this embodiment. 1... Center pillar 2... Webbing winding device 3... Seat belt 4... Through ring 5...
・Seat 6... End 7... Tongue plate 8... Buckle 9... ELR device 10.
... Traction device 11... Drive device 12... Acceleration sensor 20... Sensor body 20a, 20b...
- End surfaces 21a, 21b... Pendulum 22... Guide hole 23... Spring receiver 24...
- Firing pin 25... Point 26... Plunger 27... First coil spring 28... Second coil springs 29a, 29b... Trigger arm 30... Bin 31... Slit 32...
・Engagement groove 33...Protrusion 34...Hook
35... tongue piece 36... bias spring 37...
・Plate 38... Recommendation 39... Detonator Applicant: Honda Motor Co., Ltd. Representative Patent Attorney: Yo Oshima - Figure 1, 3r! ! :i Figure 4 j IE 5 Procedural amendments voluntarily written) 1. Indication of the case 1988 Patent Application No. 143637 2. Name of the invention Acceleration detection device for vehicles 3. Person making the amendment Relationship to the case Patent applicant address 2-1-1 Minami-Aoyama, Minato-ku, Tokyo Name
(532) Honda Motor Co., Ltd. 4, Agent

Claims (1)

[Scope of Claims] A vehicle acceleration detection device for releasing energy stored in advance in an energy storage means when a predetermined acceleration or deceleration is detected, the device comprising: a spring-loaded energy release means; a plurality of sensor weights supported to be displaceable along the acting direction of acceleration or deceleration and spring-loaded in the non-actuating direction; and the plurality of sensor weights. and a plurality of trigger means respectively engaged with the energy release means to hold the energy release means in an inoperative state, wherein the plurality of sensor weights are movable independently of each other and the plurality of sensor weights simultaneously move in the same direction. An acceleration detection device for a vehicle, wherein the energy release means operates only when the vehicle is displaced.