JPH1037996A - Fitting structure of abrasion detecting probe for braking piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the work of fitting an abrasion detecting probe for a brake. SOLUTION: An fitting plate 2 to compose a brake shoe 11 is communicatedly provided with an inserting hole 23a and a regulating hole 23b. On the other hand, in an abrasion detecting probe 12, both upper and lower end parts of the probe body 13 are provided with a slip stopping protrusive part 15 and an engaging protrusive part 16. The frame part 17 of the probe body 13 is fitted with a holder 16 having an elastic engaging piece part 20. When the abrasion detecting probe 12 having the fitted holder 18 is inserted into an inserting hole 23a, the abrasion detecting probe 12 is pushed toward a regulating hole 23b by the elastic power of the holder 18. Thus, the abrasion detecting probe 12 is pushed against the side wall of the regulating hole 23b to be held, and moreover the slip stopping protrusive part 15 and the engaging protrusive part 16 engages on both the sides of the attaching plate 21, and are kept in a state where movements in inserting and slipping directions are regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for detecting wear of a brake piece, and more particularly to an improved probe mounting structure.

[0002]

2. Description of the Related Art Hitherto, a wear detecting probe has been developed which detects that the degree of wear of a brake pad in an automobile has reached a use limit. The structure for mounting the wear detecting probe is disclosed in Japanese Utility Model Laid-Open No. 2-14849.
The one disclosed in Japanese Patent Application Publication No. JP-A-2006-26095 is known. FIG. 5
As shown in the figure, the mounting plate 2 to which the brake pad 1 is fixed
Is formed with a mounting hole 4 for inserting the wear detecting probe 3, and a rear end portion (an upper end portion in the figure) of the mounting hole 4.
Is cut out to a diameter larger than the outer diameter of the wear detection probe 3. Further, a female screw is formed on the inner peripheral surface of the large-diameter portion 4a. The rear end (upper end in the figure) of the wear detection probe 3 projects in a flange shape, and the spacer 5 comes into contact with the wear detection probe 3 from the front end side.

In order to fix the wear detecting probe 3 to the mounting plate 2, a spacer 5 is fitted into the wear detecting probe 3, and the wear detecting probe 3 is inserted into the mounting hole 4 in this state. Further, after that, the box nut 6 may be fitted into the wear detection probe 3 from behind (upward in the figure) and tightened to the female screw of the large-diameter portion 4a.

[0004]

However, in the case of the above structure, screwing work must be performed to fix the wear detecting probe to the mounting plate, so that the workability is not necessarily good. . In particular, in the case of a drum brake, since the brake shoes are arranged on the back side of the wheel, there is a situation that the work of mounting the wear detection probe must be performed while groping with the hand behind the wheel. Is difficult to work with. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mounting structure of a wear detecting probe of a brake piece, which is easy to mount.

[0005]

In order to achieve the above object, a mounting structure for a wear detecting probe for a brake piece according to the first aspect of the present invention has a brake piece provided so as to be in contact with a rotating body, the degree of wear being limited. In a mounting structure for mounting a wear detection probe for detecting whether or not the brake has reached, a mounting portion for inserting the wear detection probe is formed on one side of the brake, and a holding member capable of elastically engaging with the brake side. The wear detecting probe is held in a state of being inserted into the mounting portion by the elastic force of the holder.

A wear detecting probe for a braking piece according to a second aspect of the present invention comprises:
The mounting structure according to claim 1, wherein the holder elastically supports the wear detecting probe in a direction in which the rotational force of the rotating body acts.

A third aspect of the present invention is a brake piece wear detecting probe.
3. The mounting structure according to claim 1, wherein the mounting portion includes an insertion portion for inserting the wear detection probe, and the insertion portion communicates with the insertion portion and engages with the wear detection probe to insert the mounting direction. And a restricting portion for restricting movement in the pull-out direction is provided. After the wear detection probe is inserted into the insertion portion, the probe is displaced by the elastic force of the holder and is held by the restricting portion. It is characterized by having become.

[0008]

According to the first aspect of the present invention, when the wear detecting probe is inserted into the mounting portion formed on one side of the brake,
The wear detecting probe is held in that state by the elastic force of the holder. Therefore, screwing work or the like is unnecessary, and the wear detecting probe is held by merely inserting the work, so that the workability is excellent.

According to the second aspect of the present invention, the holder elastically supports the wear detecting probe in the direction in which the rotational force of the rotating body acts. Therefore, it is possible to reduce the impact due to the rotational force received when the wear detection probe comes into contact with the rotating body.

According to the third aspect of the invention, when the wear detecting probe is inserted into the insertion portion, the wear detecting probe is displaced to the restricting portion by the elastic force of the holder and engages with the restricting portion. Accordingly, the movement of the wear detection probe in the insertion direction and the removal direction is regulated, and the holding state of the holding member with respect to the mounting portion is further ensured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a mounting structure of a wear detecting probe for a brake piece of the present invention is applied to a drum brake will be described below with reference to FIGS. The mounting structure of the wear detection probe of the present embodiment is a structure for mounting the wear detection probe 12 on the brake shoe 11 as shown in FIG.

First, the wear detecting probe 12 will be described. As shown in FIG. 1, the wear detection probe 12 is configured by embedding a wire 14 in a U-shaped state inside a resin probe body 13. The probe body 13 is formed in a prismatic shape, and has a tip portion (FIG. 1).
The middle and upper ends are beveled and tapered. A retaining projection 15 is formed on the outer surface at a position slightly below the tip. This retaining projection 15
In FIG. 1, the left and right side surfaces and the front surface (the rear side surface in FIG. 1) except for the rear surface (the front side surface) in FIG.

Further, on the outer surface of the probe body 13,
An engagement projection 16 is formed at the lower end. Like the retaining protrusion 15, the engaging protrusion 16 has a rectangular shape in which both left and right side surfaces and the front surface extrude like a flange in FIG. However, the overhang dimension is set larger than the retaining projection 15. The outer peripheral surface of the body 17 of the probe body 13, that is, between the retaining protrusion 15 and the engagement protrusion 16 is thinned so that a holder 18 described later is mounted thereon. It has become. The distance between the retaining projection 15 and the engagement projection 16 is
It is set slightly longer than the thickness of the mounting plate 21 described later.

The electric wire 14 extends from the lower surface of the probe main body 13 to the distal end thereof, and although not shown, is folded back into a U-shape at a position slightly inside the distal end surface, and is drawn downward from the lower surface of the probe main body 13 again. . A disconnection detecting unit (not shown) is connected to the end of the electric wire 14, and wear of a lining 22 described later progresses, and
When the folded end of 4 is cut, a warning lamp is turned on.

The holder 18 is formed by bending a thin metal plate, and is provided with a mounting portion 19 that can be held on the probe body 13.
And an elastic engagement piece 20 that is elastically deformable. The mounting portion 19 has a shape in which both left and right ends are bent so as to hold the body 17 of the probe body 13.
7. Elastic engagement piece 20
Is formed by cutting and raising the rear portion of the mounting portion 19 outward, slightly extending upward, and then bending outward to form a mountain-like shape. And can be deformed.

On the other hand, the brake shoe 11 is
The lining 22 is stuck on the surface of the. As shown in FIG. 2, the mounting plate 21 is formed with a mounting hole 23 for inserting the wear detection probe 12, and the lining 22 is connected to the mounting hole 23 and is larger than the mounting hole 23. An insertion space 24 is formed.
The mounting hole 23 has an insertion hole 23 a for inserting the wear detection probe 12, and the inserted wear detection probe 12
A restriction hole 23b for restricting the movement in the insertion direction and the withdrawal direction is formed so as to communicate with each other.

The insertion hole 23a is a square hole slightly larger than the outer shape of the retaining projection 15 and smaller than the engagement projection 16, so that the engagement projection 16 can be inserted when the wear detecting probe 12 is inserted. Although it is impossible, it can pass through the retaining projection 15. That is, when the wear detecting probe 12 is inserted into the insertion hole 23a, the engaging protrusion 16 is engaged with the back surface of the mounting plate 21, and in this state, the retaining protrusion 15 is in a state of passing through the front surface of the mounting plate 21. You. The insertion end of the insertion hole 23a on the insertion side is
In FIG. 2, the right end is slightly swelled inward to form an inwardly inclined surface.
The lower end of the elastic engagement piece 20 inserted into the inside 3 is brought into contact with the surface.

The restriction hole 23b is formed in the insertion hole 23a in FIG.
It is connected to the left side and forms a square hole slightly larger than the outer circumference of the body 17 of the probe body 13 (the outer circumference with the holder 18 attached). Then, when the abrasion detection probe 12 is slid laterally from the state where the retaining projection 15 has passed through the insertion hole 23a, the body 17 of the probe main body 13 fits into the body. Thereby, the mounting plate 21
Retaining projections 15 and engagement projections 16 located on both sides of
Engage with the upper and lower open ends of the regulating hole 23b (the upper and lower open ends in FIG. 4), and the movement of the wear detecting probe 12 in the insertion direction and the removal direction is restricted. In addition, the movement in the insertion direction and the removal direction with respect to the wear detection probe 12 is not completely restricted. A slight gap is formed between the portion 15 and the engaging protrusion 16, so that the wear detecting probe 12 slightly rattles in the inserting direction and the removing direction.

Next, the operation of the present embodiment will be described.
In order to attach the wear detection probe 12 to the brake shoe 11, first, the wear detection probe 12 is gripped with respect to the insertion hole 23a in a posture in which the elastic engagement piece 20 is located on the right inner wall side of the insertion hole 23a ( 2), and inserted into the insertion hole 23a from the tip side. Then, the elastic engaging piece 20 of the holder 18 is inserted and is pressed by the right inner wall surface of the insertion hole 23a to be bent inward.

The position where the retaining projection 15 completely passes through the insertion hole 23a, that is, the engagement projection 16 is
The wear detection probe 12 is pushed in until it comes into contact with the back surface of 1 (see FIG. 3). When the pushing operation is stopped in this state, the elastic engagement piece 20 that has been bent and deformed is deformed in the restoring direction, so that the wear detecting probe 12 moves to the left and is driven away to the regulating hole 23b. As a result, the wear detecting probe 12 has the retaining protrusion 15 and the engagement protrusion 1.
6 are fitted into the restriction holes 23b with the mounting plate 21 sandwiched vertically in the figure (see FIG. 4).

Therefore, the wear detecting probe 12 is
3b, the retaining projection 15 and the engagement projection 16 are engaged on both sides of the regulating hole 23b, and the wear detection probe 12 moves in the insertion direction and the removal direction. Be regulated. In this state, the wear detecting probe 12 is pressed against the left inner wall surface of the regulating hole 23b by the elastic force of the holder 18, whereby the wear detecting probe 12 is held in the mounting hole 23. Further, in this state, the elastic engagement piece 20 is
In the direction in which the rotational force from the drum (not shown) acts (FIG. 4).
(In the direction of arrow a)).

Then, the wear detecting probe 12 is attached to the mounting plate 2.
When the brake operation is repeated after the lining is mounted on the lining 1, the lining 22 gradually wears out due to the contact with the drum. Then, the tip of the wear detection probe 12 attached to the attachment plate 21 is exposed on the surface of the lining 22,
When the brake operation is performed, the wear detection probe 12 comes into contact with the drum together with the lining 22.

Here, when the wear detecting probe 12 comes into contact with the drum, it receives a rotational force from the drum in the direction of arrow a in FIG. Then, the wear detecting probe 12 slightly deforms the elastic engagement piece 20 of the holder 18 in FIG.
Displace to the right. Therefore, in the present embodiment, even if the rotational force of the drum acts on the wear detection probe 12, the impact on the rotational force is absorbed by the displacement of the wear detection probe 12 in the direction in which the rotational force acts. Further, even if a force in the pressing direction acts on the wear detection probe 12 when the wear detection probe 12 is in contact with the drum, the wear detection probe 12 is slightly rattled in the insertion direction and the removal direction. Is displaced slightly downward while pressing the lower end surface of the elastic engagement piece portion 20 against the bulging portion 23c,
It does not receive the impact force due to the contact with the drum.

As described above, in this embodiment, the wear detecting probe 12 can be held in the mounted state by the elastic force of the holder 18, so that screwing work or the like as in the conventional case is unnecessary, and the wear detecting probe is used. 12 is facilitated. In addition, since the holder 18 elastically supports the wear detection probe 12 in the direction in which the rotational force of the drum acts, it is possible to reduce the impact of the rotational force received when the wear detection probe 12 comes into contact with the drum. Further, by displacing the wear detecting probe 12 to the regulating hole 23b by the elastic force of the holder 18, the wear detecting probe 1 is moved.
The movement in the insertion direction and the withdrawal direction of 2 is regulated, so that the mounting state is ensured.

The present invention is not limited to the above-described embodiment, but can be modified as follows, for example, and these embodiments also belong to the technical scope of the present invention. (1) In the above embodiment, after the wear detection probe 12 is inserted into the insertion hole 23a, the movement in the insertion direction and the removal direction is restricted by displacing the wear detection probe 12 into the restriction hole 23b. It may be configured to be inserted and held only by the elastic force of the holder.

(2) In the above embodiment, the wear detecting probe 12 is elastically supported by the holder 18 in the direction in which the rotational force of the drum acts when mounted on the mounting plate 21. However, it is not always necessary to be elastically supported in the direction in which the rotational force of the drum acts. For example, it is elastically supported in the direction opposite to the direction in which the rotational force of the drum acts. You may.

(3) In the above embodiment, the mounting structure of the brake piece wear detecting probe of the present invention is applied to a drum brake, but it is naturally applicable to a disc brake or the like.

(4) Although the wear detecting probe 12 in the above embodiment detects the wear of the lining 22 by cutting the electric wire 14, the present invention can be applied to a wear detecting probe having another structure. Good.

(5) In the above embodiment, the holder 18 is made of metal, but the holder may be made of resin or the like.
Further, it may be formed integrally with the wear detection probe. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the entire embodiment.

FIG. 2 is a sectional view showing a state before mounting.

FIG. 3 is a sectional view showing a state during mounting.

FIG. 4 is a sectional view showing a state after attachment.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Brake shoe (braking piece) 12 ... Wear detection probe 18 ... Holder 23 ... Mounting hole (mounting part) 23a ... Insertion hole (insertion part) 23b ... Restriction hole (restriction part)

Claims (3)

[Claims] 1. A mounting structure for mounting a wear detection probe for detecting whether or not the degree of wear of a brake piece provided to be able to contact a rotating body has reached a use limit, wherein the wear detection probe is provided on one side of the brake. A mounting portion for inserting the abrasion detecting probe is formed, and a holding tool elastically engageable with the brake piece side is provided, and the wear detection probe is held in a state inserted into the mounting portion by the elastic force of the holding tool. A mounting structure for a wear detecting probe for a braking piece, characterized in that: 2. The mounting structure according to claim 1, wherein the holding member elastically supports the wear detecting probe in a direction in which a rotational force of the rotating body acts. Mounting structure for one piece wear detection probe. 3. The mounting structure according to claim 1, wherein the mounting portion includes an insertion portion for inserting the wear detection probe, and the insertion portion communicates with the insertion portion to engage with the wear detection probe. A restriction portion for restricting movement in the insertion direction and the removal direction is provided. After the wear detection probe is inserted into the insertion portion, the probe is displaced by the elastic force of the holder and is held by the restriction portion. A mounting structure for a wear detecting probe for a braking piece, wherein