JP2003234051A - Collision detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detector that can effectively prevent chattering of electric contacts. <P>SOLUTION: A contact means is arranged so that a pressing position X where a cam 5 presses a first spring contact member 7 may be almost the same position as a contact 8a when the first spring contact member 7 is pressed by the cam 5 and comes into contact with the contact 8a of a first leaf spring 8A. In other words, a contact position where the first spring contact member 7 comes into contact with 8a and the pressing position X where the cam 5 presses the first spring type contact member 7 are set to be almost at the same distance from a base 6a with regard to the first spring contact member 7. According to this constitution, when the first spring contact member 7 comes into contact with the contact 8a, the first spring contact member 7 is pressed by the cam 5 with regard to the contact 8a, thus even if a degree of deceleration at collision is higher, the first spring contact member 7 does not vibrate with regard to the contact 8a, a stable contact status can be retained, and generation of chattering can be prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision detection device for detecting a deceleration of a predetermined level or more which occurs when a vehicle collides.

[0002]

2. Description of the Related Art As a conventional technique, there is a collision detection device described in Japanese Patent No. 3197124. As shown in FIG. 3, this collision detection device includes a drive member (rotor) 3 that is displaced in the direction of arrow a when a vehicle collides, a first spring contact member 7 that is pressed by the drive member 3, and a pressing member. Second spring-like contact member 8 with which the first spring-like contact member 7 comes into contact, and in order to prevent chattering between both contact members, two second spring-like contact members 8 are provided, for example. It is composed of a leaf spring.

[0003]

A collision detection device mounted on a vehicle is often installed in front of the vehicle (for example, inside a front fender) for the purpose of early detection, and high deceleration occurs. In the environment. For this reason,
There is a need to improve the chattering prevention effect. However, in the above-mentioned conventional technique, the pressing position X where the drive member 3 presses the first spring-shaped contact member 7 and the pressed first spring-shaped contact member 7 contacts the second spring-shaped contact member 8. The optimum positional relationship with the contact position Y is not clarified.

In other words, the pressing position X at which the driving member 3 presses the first spring-shaped contact member 7 and the contact at which the pressed first spring-shaped contact member 7 contacts the second spring-shaped contact member 8. When the position Y is largely separated, when the first spring-shaped contact member 7 pressed by the driving member 3 comes into contact with the second spring-shaped contact member 8, the pressing position X of the driving member 3 is used as a fulcrum. Since the first spring-shaped contact member 7 vibrates, the amplitude at the contact position Y where the first spring-shaped contact member 7 contacts the second spring-shaped contact member 8 becomes large, and chattering cannot be effectively prevented. The problem arises.

The second spring-shaped contact member 8 also causes chattering by vibrating around the pressing position Z against the locking portion 9 as a fulcrum. The present invention has been made based on the above circumstances, and an object thereof is to provide a collision detection device that can effectively prevent chattering of electrical contacts.

[0006]

According to the present invention, when a deceleration of a predetermined level or more occurs, the first spring-shaped contact member is pressed by the drive member and the second spring-shaped contact member is pressed. A collision detection device that contacts a contact member and outputs the contact state as an electric signal, wherein a contact position at which a first spring-like contact member contacts a second spring-like contact member and a drive member is a first contact member.
The pressing position for pressing the spring-like contact member is set to be substantially equidistant from the base portion with respect to the first spring-like contact member.

According to this structure, the contact position where the first spring-shaped contact member contacts the second spring-shaped contact member and the pressing position where the drive member presses the first spring-shaped contact member are Since the first spring-like contact member is provided at substantially the same position as that of the first spring-like contact member, the first spring-like contact member pressed by the driving member becomes the second spring-like contact member.
When the first spring-shaped contact member comes into contact with the second spring-shaped contact member, vibration at the contact position where the first spring-shaped contact member contacts the second spring-shaped contact member is suppressed, and chattering can be effectively prevented. In addition, the rigidity of the driving member is higher than that of the spring-shaped contact member, so that the vibration of the second spring-shaped contact member can be converged.

(Invention of Claim 2) In the collision detecting device according to claim 1, the second spring-like contact member is a first plate with which the first spring-like contact member is pressed and brought into contact with the driving member. A spring and a second leaf spring that urges the first leaf spring toward the first spring-like contact member side in opposition to the pressing force of the drive member that pushes the first spring-like contact member. There is.

In this structure, a larger contact load (compared between the first spring-shaped contact member and the second spring-shaped contact member) is provided as compared with the case where the second spring-shaped contact member is provided alone (one plate spring). It is possible to obtain the minimum load required to maintain the contact state. That is, without increasing the plate thickness of the first plate spring and the second plate spring (when the plate thickness increases, the elastic range of the plate spring decreases), the first plate spring and the second plate spring Since a large amount of bending can be secured, chattering can be prevented more effectively and a more stable electric signal can be output.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a collision detection device 1 according to the configuration of the present invention, and FIG. 2 is a sectional view showing the structure of the collision detection device 1. As shown in FIG. 2, the collision detection device 1 of the present embodiment includes a rotor 3 that is rotatable about a rotation shaft 2, and a contact means (described below) for opening and closing an electric circuit (not shown). Equipped with.

The rotor 3 is provided integrally with the weight 4, and the gravity center of the weight 4 is provided at a position eccentric from the rotation shaft 2 of the rotor 3. Therefore, when deceleration occurs during a vehicle collision, a moment acts on the center of gravity of the weight 4 according to the law of inertia, and the rotor 3 rotates integrally with the weight 4 around the rotation shaft 2 in the direction of the arrow in FIG. To do. Further, the rotor 3 is integrally provided with a cam 5 for closing the contact means in the event of a vehicle collision.

The contact means is a base portion 6a of the housing 6.
It is composed of a first spring-shaped contact member 7 and a second spring-shaped contact member 8 which are erected at a predetermined interval. The first spring-shaped contact member 7 is provided by a single leaf spring, and the tip end of the leaf spring elastically abuts the side surface of the cam 5 to move the rotor 3 in the counterclockwise direction in FIG. I am biased.
Therefore, the rotor 3 does not rotate even if a low level deceleration occurs due to vibration during running or sudden braking, and the side surface of the weight 4 contacts the wall surface 6b of the housing 6 (the initial position (shown in FIG. 2)). Stationary).

The second spring contact member 8 is composed of, for example, two leaf springs (a first leaf spring 8A and a second leaf spring 8B). The first leaf spring 8A has its tip end elastically abutted against the locking portion 9 provided in the housing 6. The first leaf spring 8A is provided with a contact portion 8a with which the first spring-shaped contact member 7 pressed by the cam 5 by the rotation of the rotor 3 comes into contact. As shown in FIG. 2, for example, the contact portion 8a is formed by bending a part of the first leaf spring 8A into a triangular shape, and the contact portion 8a and the first spring-like contact member 7 have a constant shape. The space is secured.

The second leaf spring 8B is located on the opposite side of the first leaf spring 8A from the first spring-shaped contact member 7, and the tip portion of the second leaf spring 8B has elasticity to the first leaf spring 8A. Then, the first leaf spring 8A is urged toward the locking portion 9 side. In the first leaf spring 8A and the second leaf spring 8B, the spacer 10 is arranged between the root portions supported by the base portion 6a, and a predetermined gap is set between the two. However,
If the distance between the roots of the first leaf spring 8A and the second leaf spring 8B is a predetermined distance, it is not necessary to provide the spacer 10.

The contact means is electrically connected to, for example, a printed circuit board (not shown) housed in the housing 6, and forms an open / close contact of an electric circuit provided on the printed circuit board. The printed circuit board is an ECU (not shown)
(Electronic control device), the first spring contact member 7
When comes into contact with the second spring contact member 8 (contact portion 8a of the first leaf spring 8A) to close the electric circuit, an electric signal indicating the state is output to the ECU.

Next, the operation of the collision detection device 1 will be described.
When a vehicle collides and deceleration of a predetermined level or more occurs, a moment acts on the center of gravity of the weight 4, causing the rotor 3 to rotate from the initial position shown in FIG. . By the rotation of the rotor 3,
When the first spring-like contact member 7 is pressed by the cam 5 and comes into contact with the second spring-like contact member 8 (the contact portion 8a of the first leaf spring 8A), the electric circuit is closed and the contact state is established. Is output to the ECU (not shown) as an electric signal, and the EC
A collision is detected at U.

Here, in the collision detection device 1 of the present embodiment, as shown in FIG. 1, the first spring-shaped contact member 7 is pressed by the cam 5 and comes into contact with the contact portion 8a of the first leaf spring 8A. When I did
The pressing position X where the cam 5 presses the first spring-shaped contact member 7 is set to the substantially same position as the contact portion 8a of the first leaf spring 8A. In other words, the first spring contact member 7 is pressed by the cam 5 and the contact portion 8a of the first leaf spring 8A is pressed.
The contact position Y that contacts the first spring-shaped contact member 7 and the pressing position X that the cam 5 presses the first spring-shaped contact member 7 are set substantially equidistant from the base portion 6a with respect to the first spring-shaped contact member 7. There is.

According to this structure, the first spring contact member 7 pressed by the cam 5 is the contact portion 8a of the first leaf spring 8A.
Since the first spring-shaped contact member 7 is pressed against the contact portion 8a by the cam 5 when it comes into contact with the contact portion 8a, even if the deceleration at the time of collision is large, Since the spring contact member 7 does not vibrate and a stable contact state can be maintained, chattering can be prevented.

Since the second spring-shaped contact member 8 is composed of the first plate spring 8A and the second plate spring 8B, the second spring-shaped contact member 8 is a single member (one plate). A larger contact load can be obtained than when a spring is used. That is,
The first plate spring 8A and the second plate spring 8B are not thickened (the plate thickness can be reduced to reduce the weight).
Since a large amount of bending of the leaf spring 8A and the second leaf spring 8B can be secured, the chattering prevention effect is enhanced and a more stable electric signal can be output.

When the first spring-shaped contact member 7 contacts the contact portion 8a of the first leaf spring 8A, the pressing position X at which the cam 5 presses the first spring-shaped contact member 7 is: When the contact portion 8a of the first leaf spring 8A (contact position Y with the first spring-shaped contact member 7) is set to be apart from the base portion 6a, the first spring-shaped contact member 7 is set to the first position. After contacting the contact portion 8a of the leaf spring 8A, the rotor 3 further rotates and the cam 5
The cam 5 passes over the contact portion 8a, the cam 5 causes the contact portion 8a to move.
There is a possibility that the rotor 3 will not be able to return to the initial position due to being caught in the.

On the other hand, in this embodiment, the cam 5 is the first
Since the pressing position X of pressing the spring-like contact member 7 is set to be substantially the same as the contact portion 8a of the first leaf spring 8A, the torque peak when the cam 5 passes over the contact portion 8a is small. Or the torque peak disappears. As a result, even if the cam 5 gets over the contact portion 8a, the rotor 3 is not prevented from returning and the contact means can be reliably disconnected.

(Modification) The second spring contact member 8 is 1
It may be provided by one leaf spring. Alternatively, it may be composed of three or more leaf springs. The collision detection device 1 of the present embodiment is configured such that when deceleration occurs, the rotor 3 rotates about the rotation shaft 2, but for example, the drive member that presses the first spring-shaped contact member 7 is linear. It may be configured to reciprocate.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a collision detection device according to the configuration of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a collision detection device.

FIG. 3 is a schematic diagram of a conventional collision detection device.

[Explanation of symbols]

1 Collision detection device 3 Rotor (driving member) 6a base part 7 First spring contact member (contact means) 8 Second spring contact member (contact means) 8A First leaf spring 8B Second leaf spring

Claims (2)

[Claims] 1. A drive member that is displaced from an initial position in response to a deceleration that occurs when a vehicle collides, a first spring-like contact member and a second spring-like member that are erected on a base portion with a predetermined interval. A contact member having a contact member, wherein the first spring-like contact member is pressed by the drive member to contact the second spring-like contact member when deceleration of a predetermined level or more occurs, A collision detection device that outputs the contact state as an electric signal, wherein a contact position at which the first spring-like contact member is pressed by the drive member and comes into contact with the second spring-like contact member, and the drive member. And a pressing position for pressing the first spring-shaped contact member is set to be substantially equidistant from the base portion with respect to the first spring-shaped contact member. 2. The collision detection device according to claim 1, wherein the second spring-like contact member is a first leaf spring with which the first spring-like contact member is pressed and brought into contact with the driving member. And a second leaf spring that urges the first leaf spring toward the first spring-like contact member side in opposition to the pressing force of the drive member that pushes the first spring-like contact member. Collision detection device characterized by being provided.