JPH0547860U - Collision sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a safing collision sensor that eliminates resonance of the ball mass due to vibration generated in the radial direction of the cylinder at the time of collision, allows the ball mass to move smoothly, and operates without delay. Is. In order to solve the above-mentioned object, a collision sensor of the present invention comprises a ball mass 11 which detects a collision and moves, a cylindrical body 22 which houses the ball mass 11 and restrains the movement in one direction, A magnet 13 attached to the tubular body 22 for attracting the ball mass 11 to one end of the tubular body 22;
In a collision sensor including a contact 14 located on the other end side in the cylindrical body 22 and forming a contact with the ball mass 11, before and after the repulsion of the ball mass 11 in the radial direction of the cylindrical body received from the peripheral surface of the cylindrical body 22. Ridge 22A that changes direction,
22B and 22C on the circumferential surface of the cylindrical body 22 in the axial direction of the cylindrical body.
The number of articles is more than one.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safing collision sensor with respect to a main collision sensor used in an airbag system for ensuring the safety of a driver and passengers from a shock caused by a collision accident of a vehicle, and particularly against a magnetic attraction. It concerns moving ball masses that detect collisions.

[0002]

[Prior Art]

 This type of safing collision sensor is intended to prevent malfunction of the airbag system and improve system reliability.When the main collision sensor is a mechanical type, the location of the main collision sensor is set. Even if the vehicle is placed in a room other than the above and accidentally gives a shock to the main collision sensor when the engine room is inspected, the safety collision sensor remains off and the airbag system does not start. It is getting like this. In the case of the electric type, it is installed in the same place as the main collision sensor at once, and even if the main collision sensor is turned on due to electromagnetic interference, the safing collision sensor remains off, and the airbag system It will not start. When a collision occurs, both the main collision sensor and the safing collision sensor are turned on and the airbag system is started.

As such a safing collision sensor, there is a collision sensor 9 shown in FIGS. 5 and 6.

The detailed structure and operation of the safing collision sensor 9 will be described with reference to FIGS. 5 and 6. FIG. 5 is a sectional view showing a conventional collision sensor, and FIG. 6 is a sectional view taken along the line BB of the conventional collision sensor. A ball mass 11 that moves upon sensing a collision, a cylinder 12 that houses the ball mass 11 and restrains its movement in one direction, and a ball mass 11 attached to the cylinder 12 that attracts the ball mass 11 to one end of the cylinder 12. And a contact 14 that is located on the other end side of the cylindrical body 12 and forms a contact with the ball mass 11. Reference numeral 12a is a holding plate for holding the contact 14 and taking out a terminal, which is fitted in the cylindrical body 12. The contact 14 is composed of cantilever elastic pieces 14a and 14b which are arranged to face each other as shown in FIG.

Next, the operation of the collision sensor having such a structure will be described below. Normally, the ball mass 11 is attracted by the magnet 13 and is positioned at one end side of the cylindrical body 12 as shown in the figure. Due to the acceleration caused by the collision, the ball mass 11 overcomes the attractive force of the magnet 13 and moves inside the cylindrical body 12. Moving. When the cantilever elastic pieces 14a and 14b forming the contact 14 are contacted with each other, the contacts are closed and a current flows.

[0006]

[Problems to be solved by the device]

 By the way, the main collision sensor used in this type of airbag system corresponds to various types of collisions, senses a specific acceleration, and turns on, and its operating time is longer than the operating time of the safing collision sensor. short. The safing collision sensor must be turned on during the short operation of the main collision sensor, and therefore the safing collision sensor must operate without delay when a collision is detected.

However, in this type of collision sensor 9, when the collision occurs, the ball mass 11 resonates with the vibration generated in the radial direction of the cylindrical body 12, and as a result, the cylindrical body 12 due to the friction between the cylindrical body 12 and the ball mass 11. Since the axial resistance of the cylinder increases, the cylinder body 12 cannot be smoothly moved in the axial direction, and it may not be possible to operate without delay.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to resonate the ball mass due to the vibration generated in the radial direction of the cylindrical body at the time of collision. Therefore, the present invention aims to provide a safety collision sensor in which the ball mass moves smoothly and operates without delay.

[0009]

In order to solve the above-mentioned problems, a collision sensor of the present invention comprises a ball mass that detects a collision and moves, and a cylindrical body that houses the ball mass and restrains the movement in one direction. And a magnet attached to the cylindrical body for attracting the ball mass to one end side of the cylindrical body, and a contact located at the other end side of the cylindrical body to form a contact point with the ball mass. Three or more ridges are provided on the peripheral surface of the cylinder in the axial direction of the cylinder to change the front and rear directions of the repulsion of the ball mass in the radial direction of the cylinder received from the peripheral surface of the cylinder.

[0010]

[Action]

 The ball mass tries to vibrate in the radial direction of the cylinder due to the vibration generated in the radial direction of the cylinder at the time of collision. At that time, since three or more ridges are provided on the circumferential surface of the tubular body in the axial direction of the tubular body, the directions before and after the repulsion that the ball mass receives from the circumferential surface of the tubular body are different, and the ball mass is The frictional force in contact with the body is also reduced. As a result, the ball mass does not resonate with the vibration generated in the axial direction of the cylinder, and moves smoothly inside the cylinder.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a view showing a collision sensor of the present invention, FIG. 2 is a sectional view taken along the line AA of the present invention, FIG. 3 is a view showing a detailed position of a convex shape of the present invention, and FIG. FIG. In FIGS. 1 and 2, parts having the same operations as those in FIGS. 5 to 6 are designated by the same reference numerals, and the description thereof will be omitted. 1 and 2, the point different from FIGS. 5 to 6 is the peripheral surface of the cylindrical body that houses the ball mass.

In FIG. 1 and FIG. 2, ridges 22 A, 22 B, 22 C that change the front-back direction of the repulsion of the ball mass are provided on the peripheral surface of the cylindrical body 22 integrally with the cylindrical body 22 in the axial direction of the cylindrical body. Has been. The diameter of the tangent circle formed by the ridges 22A, 22B, 22C is slightly larger than the diameter of the ball mass 11. Then, as shown in FIG. 2, these ridges 22A, 22B, 22C are provided at positions that are not line symmetric. The provision of the ridges at positions that are not axisymmetric differs in the directions before and after the repulsion received from the peripheral surface of the cylindrical body 22 of the ball mass 11 that resonates with the vibration generated in the radial direction of the cylindrical body 22 when a collision occurs. For example, when the ridges 22A and 22B are provided at the positions shown in FIG. 3, the positions α1 and 22B, which are the symmetry axes of 22A and 22B, are 22A and 22C (not shown). 22C (not shown) must be provided at positions other than the three points α2, 22A which are the axes of symmetry and 22C which is not shown in the figure and 22C which is the axis of symmetry. Therefore, if the directions before and after the repulsion of the ball mass 11 are set in different directions, the shape and number of the radial cross section of the tubular body 22 are not limited.

Next, the operation of the collision sensor 21 having the above-described configuration will be described with reference to FIG. When vibration is generated in the direction of arrow A, the ball mass 11 moves in the direction of vibration and comes into contact with the ridge 22A as shown in FIG. 4 (a), and receives a drag force from 22A in the direction of arrow B. When the ball mass 11 that receives the drag moves, it contacts the ridge 22B as shown in FIG. 4 (b). At that time, the ball mass 11 is changed by the arrow 22B to a different direction before and after the repulsion, that is, an arrow C. When the ball mass 11 whose direction before and after the repulsion is changed is moved, as shown in FIG. 4C, the ball mass 11 contacts the ridge 22C, and the direction is changed again by 22C. As a result, the ball mass does not resonate with the vibration generated in the radial direction of the tubular body, and the resistance in the axial direction of the tubular body does not increase, so that the ball mass smoothly moves.

[0014]

[Effect of the device]

 In the collision sensor of the present invention, when the vibration occurs in the radial direction of the cylindrical body due to the collision, three or more ridges are provided on the peripheral surface of the cylindrical body in the axial direction of the cylindrical body, so that the ball mass is formed on the peripheral surface of the cylindrical body. Since the front and back directions of the repulsion received from are set in different directions, as a result, the resonance phenomenon of the ball mass does not occur, the ball mass moves smoothly in the cylinder, and the safing collision sensor operates without delay. As is the best.

[Brief description of drawings]

FIG. 1 is a view showing a collision sensor of the present invention.

FIG. 2 is a sectional view taken along the line AA of the collision sensor of the present invention.

FIG. 3 is a view showing detailed positions of a convex shape of the present invention.

FIG. 4 is a schematic view of the collision sensor of the present invention.

FIG. 5 is a cross-sectional view showing a conventional collision sensor.

FIG. 6 is a BB cross-sectional view of a conventional collision sensor.

[Explanation of symbols]

 21 Collision Sensor 11 Ball Mass 13 Magnet 14 Contact 22 Cylindrical Body 22A, 22B, 22C

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Etsujiro Imanishi 1764.4-1 Sensor Technology Co., Ltd. In-house

Claims (1)

[Scope of utility model registration request] 1. A ball mass that detects a collision and moves, a cylinder that accommodates the ball mass and restrains the movement in one direction, and a magnet that is attached to the cylinder and that attracts the ball mass to one end of the cylinder. And a contact which is located on the other end side of the cylindrical body and forms a contact point with the ball mass, wherein a projection that changes the direction before and after the repulsion of the ball mass in the radial direction of the cylindrical body received from the peripheral surface of the cylindrical body. A collision sensor, characterized in that three or more lines are provided on the peripheral surface of the cylinder in the axial direction of the cylinder.