JPH06300064A - Probe for detecting abrasion of brake lining material and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide an abrasion detecting probe, which can prevent the generation of detection failure due to a short circuit of electric wires and which can be manufactured easily, and the manufacture thereof. CONSTITUTION:A probe 10 is formed by molding a detecting conductor 14 made of metal with the heat resistant resin 15. In the mold resin layer 15, a deep groove-like slit 19 is formed between each wire connection part 17, 17 of the detecting conductor 14 along the diameter direction so as to divide both the connection parts 17, 17, and this slit 19 is manufactured by a projection provided in a molding. At the time of manufacturing the mold resin layer 15, even in the case where a part of a core 18a of a wire 18 connected to the detecting conductor 14 is frayed and projected from the wire connection part 17, the core 18a is eliminated from a space between both the wire connection parts 17, 17 by the projection of the molding to prevent the generation of a short circuit between both the wires 18, 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear detecting probe for detecting wear of a brake lining material such as a brake pad of a vehicle disc brake.

[0002]

2. Description of the Related Art As an example of this type of wear detecting probe, a probe 1 having a structure shown in FIG. 7 is known. This is manufactured by connecting a pair of electric wires 3 to both ends of a detection conductor 2 made of a U-shaped metal plate as a whole, and integrally molding the detection conductor 2 together with each electric wire connecting portion 4 with a resin 5. ing. A folded disconnectable portion 6 is formed at the center of the detection conductor 2 and is located in the tip surface of the probe 1.

Although not shown, the probe 1 having this structure is set along a brake lining material in a vehicle brake device, and when the wear amount of the lining material reaches a predetermined value, the tip end surface rubs against the rotor. As a result, the wire breakable portion 6 wears and breaks, so that the electric wires 3 are not electrically connected to each other, and the wear of the lining material can be detected.

[0004]

By the way, in this type of wear detecting probe 1, when the electric wire 3 is connected to both ends of the detecting conductor 2, it is formed in the electric wire connecting portions 4 at both ends of the detecting conductor 2. Wire 3 by folding back the tongue pieces 4a, 4a
The core wire 3a is bent so as to wrap it, and in that state, it is fixed by spot welding or the like. Therefore, in the process of the connecting work, a part of the core wire 3a of the electric wire 3 is frayed and the electric wire connecting portion 4
It may be in a state of popping out from.

Then, when such a detection conductor 2 is set in the molding die 7 for molding, the core wire 3a protruding from both the left and right electric wire connecting portions 4 in the cavity 7a of the molding die 7 as shown in FIG. May come into contact with each other. If molded in this state, the electric wires 3 and 3 remain in a short-circuited state. Therefore, even if the disconnectable portion 6 of the detection conductor 2 is cut due to wear of the lining material, the electric wires 3 and 3 are not easily disconnected. Remains electrically conductive, and wear of the lining material cannot be detected.

The present invention has been made in view of the above circumstances. Therefore, one of the objects of the present invention is to provide a wear detection probe capable of preventing the occurrence of wear detection failure due to the above-mentioned short circuit of electric wires. Another object of the present invention is to provide a manufacturing method capable of easily manufacturing such a wear detection probe.

[0007]

A probe for wear detection of a brake lining material according to the present invention is configured such that an electric wire is connected to both ends of a detection conductor having a folded-back disconnectable portion, and the detection conductor is connected to an electric wire connection portion. The resin is integrally molded with resin, and a hollow portion is formed in a portion of the molded resin layer located between the electric wire connecting portions (the invention of claim 1).

Further, in manufacturing such a probe for detecting wear, electric wires are connected to both ends of a detection conductor having a folded-back disconnectable portion, and the detection conductor is housed in a molding die together with the electric wire connection portion. It is possible to use a mold which is integrally molded with a resin and has a protrusion located between both electric wire connecting portions for forming a hollow portion in the mold resin layer as the molding die. (Invention of Claim 2).

[0009]

According to the wear detecting probe of the present invention, since the hollow portion is formed in the portion of the mold resin layer located between the electric wire connecting portions, the electric wire of the electric wire connecting portion is tentatively left and right. Even if the core wires protrude, these core wires are prevented from coming into contact with each other due to being hindered by the hollow portion.

According to the second aspect of the present invention, there is provided a method for manufacturing a probe for wear detection, which uses a mold provided with a protrusion for forming a hollow portion, which is located between both electric wire connection portions of the detection conductor. Therefore, even if the core wire of the electric wire protrudes from both the left and right electric wire connection parts, these core wires will not be contacted with each other due to the protrusion of the molding die, and they will be molded in that state. Is prevented.

[0011]

As described above, according to the wear detecting probe of the first aspect, the core wires of the pair of electric wires connected to the detecting conductor do not become short-circuited with each other, and therefore the brake lining material. Wear can be reliably detected. Further, according to the manufacturing method of the second aspect, the short circuit of the core wire can be eliminated only by accommodating the detection conductor in the molding die for the resin molding, so that the wear detection probe of the first aspect can be efficiently manufactured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS.

As shown in FIG. 6, the probe 10 of this embodiment is a disk brake for a vehicle which performs braking by sandwiching both sides of a disk-shaped rotor 11 which rotates integrally with a wheel with brake lining materials 12, 12. It has been applied to. The probe 10 is fixed side by side with the brake lining material 12 on a support plate 13 to which the brake lining material 12 is fixed.
The wear is detected by contact of the rotor 11 with the front surface of the probe 10 when the wear of the probe 10 is reduced to a predetermined value.

Now, the structure of the probe 10 will be described. As shown in FIG. 1, this is formed by molding a metallic detection conductor 14 with a heat resistant resin 15. The detection conductor 14 has a folded-back portion 16 in the central portion and has a U-shape as a whole, and the electric wire connection portions 1 at both ends are formed.
A pair of electric wires 18, 18 are connected to 7, 17. Each of these electric wires 18 is a tongue piece 1 formed on the electric wire connecting portion 17.
7a is bent so as to wrap a large number of thin core wires 18a, and in that state, the tongue piece 17a is spot-welded to be fixed to the detection conductor 14. In the mold resin layer 15, a slit 19 which is a deep groove-shaped hollow portion is formed along the diametrical direction between the electric wire connecting portions 17, 17 so as to divide the electric wire connecting portions 17 into two.

Next, a method of manufacturing the probe 10 of this embodiment will be described. First, both electric wire connection portions 1 of the detection conductor 14
A pair of electric wires 18, 18 are connected to 7, 17. This is performed by bending the tongue piece 17a and spot welding as described above. Initially, as shown in FIG. 2, the detection conductor 14 is integrally provided with a positioning projection 20 having a positioning hole 20a continuous with the folded-back portion 16 toward the front.

Then, the detection conductor 14 to which the electric wires 18, 18 are connected as described above is housed in the molding die 21. At this time, the positioning hole 20a of the positioning protrusion 20 formed in the detection conductor 14 is inserted into the positioning pin 22 of the molding die 21 to position and fix the detection conductor 14 in the cavity 23 of the molding die 21 (FIG. 3). And FIG. 4). The mold resin layer 15 is provided on the lower mold of the mold 21.
A protrusion 24 for forming the slit 19 is integrally formed therewith. Therefore, the protrusion 24 is provided in each of the electric wire connecting portions 17, 17 of the detection conductor 14 set in the cavity 23.
It is formed in a plate shape so as to be located between them and divided into right and left, and has a shape that vertically penetrates the inside of the cavity 23 as shown in FIG.

At this time, by any chance, the electric wire connecting portions 17, 17
Even if a part of the core wire 18a of the electric wire 18 is frayed and protrudes from the electric wire connecting portion 17, the protrusion 2 of the molding die 21
Since the core wire 18a is removed from between the electric wire connecting portions 17 and 17 by 4, it is possible to reliably prevent the electric wires 18 from being short-circuited due to contact with each other. After that, the molding resin is injected into the cavity 23, and the detection conductor 1
4 and a part of the electric wire 18 are integrally molded to form a core wire 18
The resin molding is performed in a state where a is not short-circuited to each other. After that, if the mold resin is cured and then released from the mold, the protrusion 24 of the mold 21 causes the mold resin layer 1
The probe 10 having the slit 19 formed in 5 is manufactured (see FIG. 5). Then, after that, the positioning protrusion 20 of the detection conductor 14 is cut and removed to complete the wear detection probe 10 of the present embodiment.

As described above, according to the wear detecting probe 10 of this embodiment, since the slit 19 is formed in the portion of the mold resin layer 15 located between the electric wire connecting portions 17 and 17, the left and right sides are temporarily assumed. Even if the core wires 18a of the electric wires 18 protrude in both the electric wire connecting portions 17, these core wires 18a are prevented from contacting each other by being blocked by the slits 19. This makes it possible to prevent an electrical short circuit between the electric wires 18 and reliably detect wear of the lining material.

The wear detecting probe 1 of this embodiment is also used.
According to the manufacturing method of No. 0, both electric wire connecting portions 1 of the detection conductor 14
Since the molding die 21 provided with the protrusion 24 located between 7 and 17 is used, both the left and right electric wire connecting portions 17,
Even if the core wire 18 a of the electric wire 18 protrudes from the wire 17, the detection conductor 14 is attached to the molding die 21 to perform molding.
Only by setting it inside, the protruding core wires 18a are eliminated by the protrusions 24 of the molding die 21 and do not come into contact with each other. In this way, it is possible to manufacture the highly reliable wear detecting probe 10 very easily.

The present invention is not limited to the embodiments described above and shown in the drawings, and the hollow portion is not limited to the deep groove-shaped slit 19 described above, and may be, for example, a cylindrical hollow portion. Alternatively, the hollow portion may be formed by cutting, for example.

[Brief description of drawings]

FIG. 1 is a perspective view of a probe showing an embodiment of the present invention.

FIG. 2 is a perspective view of a detection conductor to which an electric wire is connected.

FIG. 3 is a plan view showing a state in which a detection conductor is housed in a molding die.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view of the probe showing a state immediately after molding.

FIG. 6 is a side view showing an example incorporated in a vehicle brake device.

FIG. 7 is a perspective view showing a conventional wear detection probe.

FIG. 8 is a plan view showing a manufacturing process of a conventional probe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Probe 11 ... Rotor 12 ... Brake lining material 14 ... Detection conductor 15 ... Mold resin layer 17 ... Electric wire connection part 18 ... Electric wire 18a ... Core wire 19 ... Slit (hollow part) 21 ... Mold 24 ... Projection part

Claims (2)

[Claims] 1. A probe for detecting wear of a brake lining material, which is disconnected due to contact with a rotor when the wear amount of the brake lining material reaches a predetermined amount,
An electric wire is connected to both ends of a detection conductor having a fold-back breakable portion, and the detection conductor is integrally molded with a resin with the electric wire connection portion. A probe for wear detection of a brake lining material, characterized in that a hollow portion is formed in a portion located between them. 2. A method for producing a wear detecting probe for a brake lining material, which is brought into a disconnection state due to contact with a rotor when the wear amount of the brake lining material reaches a predetermined amount, which can be folded back. An electric wire is connected to both ends of a detection conductor having a portion, and the detection conductor is housed in a molding die together with the electric wire connection portion and integrally molded with resin. A method for manufacturing a wear detecting probe for a brake lining material, characterized in that a protruding portion for forming a hollow portion is formed at a position of the mold resin layer is used.