JPS63158719A - Stroke switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stroke switch that detects the movement of an object to be measured, and particularly to a stroke switch that detects the movement of an object to be measured. This relates to something suitable for detecting movement based on a change in .

[Conventional technology and its problems]

Recently, various brake control devices have been developed that make it easier to start the vehicle on the road. For example, in the case of a disc brake, movement of the brake pad is detected by a stroke switch. For example, when the switch disclosed in Japanese Utility Model Publication No. 55-994 is used, a large amount of stalling is required until the contact is switched.

However, the movement of the brake pad is extremely small, and if the movement is increased, the durability deteriorates, so it is required to operate accurately with small movement. If it gets very hot, it will be necessary to improve the strength of each part, and there will be a problem that shims etc. will be easily damaged.

[Problem that the invention seeks to solve]

The present invention was made in view of the above problems, and an object of the present invention is to provide a stroke switch that can be operated reliably even when the object to be measured moves by a small amount.

[Means for solving problems]

The above purpose is to provide a detector that is movable in contact with an object to be measured, a movable contact that is movable according to the movement of the detector, a fixed contact that is provided so as to be able to come into contact with the movable contact, and a movable contact that In a stroke switch having an elastic body that acts to maintain a fixed contact in a normal positional relationship with respect to each other, the movable contact side is provided between the detector and the movable contact by increasing the amount of movement of the detector. This is achieved by a stroke switch equipped with an amplification device that conveys the

[For production]

For example, if the object to be measured is a brake pad of a disc brake, when the brake is applied to stop the vehicle on the road, the object moves, but only by a small amount.

However, since the detector of this stroke switch amplifies the amount of movement and transmits it to the movable contact side, the stroke switch can be operated reliably even if the amount of movement is small.

〔Example〕

Hereinafter, a stroke switch according to an embodiment of the present invention will be described with reference to the drawings.

In the figure, the o-ksuite is shown as (1) as a whole and is used to detect movement of a brake pad in a disc brake. The switch (1) is fitted into a stepped hole (3) formed in a part of the beak mounting bracket (2), and the detector (4) is inserted from the left open end (3). Although it protrudes outward by a small length, this amount of protrusion is larger than the amount of movement of a brake pad (not shown).The brake pad is in contact with the tip of the detector (4).

The switch body is screwed into the eleventh and second casings (5) and (7) in, which are fitted into the stepped holes (3). The above-mentioned detector (4) is slidably fitted in the left part of the first casing (5), and its step part (4b
) comes into contact with the stepped portion (5a) of the first casing (5th inch) as shown, thereby restricting its leftward position.

Further, a rubber boot (6) is fixed between the tip of the detector (4) and the tip of the first casing (5).

In the first cage/g (5), an annular protrusion formed on the inner end surface of the detector (4) is a spring bearing on the circumferential surface of the disc spring (9) supported by the ring ring. The disc spring (9) has a conical shape.As will be described later, the disc spring (9) is pressed against the annular protrusion (4) of the detector (4). Then, it deforms as shown by the dashed line, but in order to facilitate this deformation, a plurality of slit-like cuts may be formed along the axial direction on the circumferential surface.

A connecting member ([η) is slidably inserted into the center hole of the ring αQ, and its left end is in contact with the small-diameter end of the disc spring (9). is the second casing (7
) is supported by the central bottom (7a) of
It is brought into contact with the small diameter side end of the

In addition, a movable contact ring (to) made of an electrically conductive material is fitted into the communication member ση, and this is biased to the right by a spring □□□. The movable contact ring (2) is in contact with the fixed contact (t5a) (1) held by the second casing (7) made of an insulating material.
5b) at a predetermined distance. This distance is smaller than the distance between the right end of the communication member Qη and the center bottom of the second casing (7).
The right end of the I bar 15b) is further held by a packing member (8) KJ:C made of an insulating material, and a lead wire (16m) (16b
) is connected to the outside. The entire switch (1) is fitted with a retaining ring C17) to prevent it from being removed.

The embodiment of the present invention is constructed as described above, and its operation will be explained next.

Although not shown, the brake pad is in contact with the tip of the detector (4), and now it is assumed that the brake pad is applied and moves to the right in Figure KS. The detector (4) is pressed by this and moves to the right.

The annular protrusion (41) presses the circumferential side of the disc spring (9),
This disc spring (9) is deformed into a more flat shape as shown by the dashed line. That is, the small-diameter end of the disc spring (9) presses the connecting member to the left. The communication member αυ moves to the right against the spring force of the spring Q4, but the amount of movement is greater than the amount of movement of the detector (4). In other words, the annular protrusion (4m) has moved to the position where it comes into contact with the center of the circumferential side of the countersunk (9) shown by the dashed line, but the small diameter side end of the countersunk (9) is The displacement is larger than that at the center of the circumferential side in proportion to the distance therebetween. Communication member ση
In other words, it becomes wider and moves.

Movable contact ring (2) is a fixed contact (15m) (15b)
After contacting K, the communication member ση moves a little further and then stops. Movable contact ring (up to) and fixed contact (15m) (
15b), a solenoid valve connected to the series lead wire (t6m) (16) is energized so that a predetermined action is performed.

When the brake pad returns to its original position, the contact member K moves to the left by the spring force of spring α4, and the detector (4)
receives the pressing force of the connecting member 01) via the disc spring (9), and also receives the restoring force of the disc spring (9) to return to the illustrated position. The movable contact ring (2) has a fixed contact (15 t
5b), the excitation current of the solenoid valve is cut off.

Although each embodiment of the present invention has been described above, the present invention is of course not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the movement of the brake pad of a disc brake is detected, but the object to be measured is not limited to this, and the movement of other general objects may be detected.

Further, in the above embodiment, the disc spring (9) was used as the width increasing device, but instead of this, for example, a pair of plate-shaped tiltable levers are used, and the annular protrusion (4a) is brought into contact with these levers. You can do it like this.

According to this method, the movable contact can be reliably brought into contact with the fixed contact even if the amount of movement of the detector is small, so it is particularly effective when the amount of movement of the object to be measured is small.

[Brief explanation of the drawing]

The drawing is a side sectional view of a stroke switch according to an embodiment of the present invention. In the figure,

Claims (1)

[Claims] A detector movable in contact with an object to be measured, a movable contact movable according to the movement of the detector, a fixed contact provided so as to be able to come into contact with the movable contact, and the movable contact and the fixed contact. In a stroke switch having an elastic body that acts to maintain a normal positional relationship with each other, an amplifying width is provided between the detector and the movable contact to increase the amount of movement of the detector and transmit it to the movable contact side. Stroke switch with device.