JP2551163Y2 - Brake pad with wear indicator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A brake pad with a wear indicator according to the present invention is used in a state of being incorporated in a disc brake used for braking an automobile. Then, when the friction material is worn with use, a signal is issued to an alarm for prompting replacement of the pad.

[0002]

2. Description of the Related Art As shown in FIG. 4, a disk brake for braking an automobile incorporates a brake pad 3 formed by adhering a friction material 2 to a surface of a back metal 1 having sufficient rigidity. During braking, the friction material 2 of the brake pad 3 is pressed against both side surfaces of the disk rotor 4 rotating together with the wheels by the action of a hydraulic cylinder (not shown).

Incidentally, the friction material 2 of the brake pad 3 is worn by repeated braking, and when the wear has progressed to a certain extent, it must be replaced with a new pad. However, since it is difficult to visually determine the thickness of the friction material 2 from the outside, a sensor called a wear indicator is attached to the brake pad 3 and the friction material 2
Is worn to an allowable limit, an alarm provided in the driver's seat based on a signal from the wear indicator 9
A command to prompt replacement of the brake pad 3 is issued.

Conventionally, such a wear indicator 9 is mounted on the end of the back metal 1 of the brake pad 3 in a state as shown in FIG. That is, at the end of the back metal 1, the friction material 2
A mounting hole 5 is formed in a portion protruding from the peripheral edge of the back metal 1 so as to penetrate the front and back surfaces of the back metal 1, and a metal holding cylinder 6 is mounted inside the mounting hole 5. A stepped portion 7 is formed on the inner peripheral surface of the intermediate portion of the holding cylinder 6, and a substantially J-shaped locking notch 8 is formed on an edge portion thereof. Wear indicator 9
Is constructed by embedding a conductive wire 11 as a detection unit in a resin 10. Also, this wear indicator 9
A locking pin 12 protruding from the locking notch 8 is provided on the side surface of the base end portion.

[0005] The wear indicator 9 as described above is attached to the backing metal 1.
In the case where the wear indicator 9 is first mounted, the compression spring 13 is inserted into the inside of the holding tube 6 mounted in the mounting hole 5, and then the wear indicator 9 is inserted into the holding tube 6 from the back side of the back metal 1. . The compression spring 13 is compressed between the step 14 formed on the outer peripheral surface of the wear indicator 9 and the step 7 of the holding cylinder 6 while the locking pin 12 is being compressed.
Into the locking notch 8. As shown in FIG. 4, in a state where the locking pin 12 is advanced to the depth of the locking notch 8, the locking pin 12 may come out of the locking notch 8 by the elasticity of the compression spring 13. Gone
The wear indicator 9 is firmly supported by the back metal 1.

[0006] With the wear indicator 9 thus supported by the back metal 1, the tip of the conducting wire 11 is positioned on the allowable wear surface X of the friction material 2 of the brake pad 3.

When the friction material 2 wears due to the repetition of braking and its thickness decreases, first, the tip portion of the resin 10 is worn or melted by friction with the disk rotor 4, and the friction material 2 As the wear progresses, the tip of the conductor 11 embedded in the resin 10 and the side surface of the disk rotor 4 rub against each other, and the conductor 11 breaks at the tip.

The breakage of the conductive wire 11 is detected by a detection circuit (not shown), which sends a signal to an alarm provided in the driver's seat, and instructs the alarm to prompt the exchange of the brake pad 3. Put out.

[0009]

However, in the case of the conventional brake pad with a wear indicator configured and operated as described above, the structure for mounting the wear indicator 9 on the back metal 1 is complicated, and the manufacturing cost is increased. Was causing it.

Japanese Unexamined Utility Model Publication No. 62-66031 discloses that a metal plate having sufficient rigidity is bent and formed into a crank shape as shown in FIG. 6, and a U-shaped notch 15 is formed at the tip of the metal plate. As shown in FIG. 5, there is described a structure in which a wear indicator 9 having a front end inserted into a mounting hole 5 is suppressed by using a support bracket 17 having a circular hole 16 formed at an end thereof.

However, in the case of the structure described in this publication, the support of the wear indicator 9 is uncertain, and the wear indicator 9 may rattle or fall off when the wear indicator 9 is severe.

The brake pad with a wear indicator of the present invention has been devised in view of the above-mentioned circumstances.

[0013]

A brake pad with a wear indicator according to the present invention comprises a back metal, a friction material attached to the surface of the back metal, and a front surface of the back metal, similarly to the above-mentioned conventional brake pad with a wear indicator. A mounting indicator formed in a state penetrating the back surface; and a wear indicator having a built-in detection unit. The wear indicator is inserted into the mounting hole, and a tip end of the detection unit is allowed to wear by the friction material. It is supported by the back metal while being positioned on the limit surface.

Further, in the brake pad with a wear indicator of the present invention, a base formed on the wear indicator and having a diameter larger than a tip end inserted into the mounting hole, and a position opposite to an outer peripheral surface of the base. And a pair of locking pins protruding from the holding member and a holding plate.

The holding plate has first and second plate portions formed by bending an intermediate portion of the plate material, and the tip of the wear indicator is inserted into at least the intermediate portion of the first plate portion. A flexible through-hole, at least an intermediate portion of the second plate portion, a base of the wear indicator, and a through-hole that can be inserted except for a pair of locking pins, respectively; Insert the tip end of the through hole of the first plate portion, the base portion through the through hole of the second plate portion,
With the pair of pins positioned between the first and second plate portions, and with the tip portions inserted into the mounting holes, the tip portions of the first and second plate portions are connected to the back metal. It is characterized in that it is fixedly attached to the back surface.

[0016]

In the brake pad with a wear indicator of the present invention configured as described above, when the wear indicator is mounted on the back metal, first, the tip end of the wear indicator is inserted into the through hole of the first plate portion. The bases are similarly inserted into the through holes of the second plate portions, respectively, and a pair of locking pins are positioned between the first and second plate portions.

Next, the front end is inserted into the mounting hole of the back metal, and the front ends of the first and second plate portions are connected and fixed to the back surface of the back metal. As a result, the pair of locking pins are pressed toward the back metal by the second plate portion, and the wear indicator is firmly supported and fixed to the back metal.

With the brake pad with the wear indicator of the present invention in which the wear indicator is supported and fixed to the back metal as described above, the action at the time of braking and the alarm at the time of issuing an alarm when the friction material is worn to an allowable limit. The effect is
This is the same as the above-mentioned conventional brake pad with a wear indicator.

[0019]

1 to 3 show an embodiment of the present invention. At a portion of the back metal 1 protruding from the peripheral edge of the friction material 2 (FIG. 4), a mounting hole 5 is formed so as to penetrate the front and back surfaces of the back metal 1. The inner peripheral surface of the mounting hole 5 has a small-diameter portion 5a on the front side (lower side in FIG. 1), a large-diameter portion 5b on the rear side (upper side in FIG. 1), and a step connecting the two portions 5a and 5b. 5c.

The tip 9a of the wear indicator 9 having a built-in detector is inserted into the mounting hole 5 as described above.
The wear indicator 9 is a small-diameter portion 5 of the mounting hole 5.
a slanted portion 9c is provided between a small-diameter distal end portion 9a having an outer diameter capable of being inserted into the mounting hole 5 without rattling and a base portion 9b having a diameter sufficiently larger than the large-diameter portion 5b of the mounting hole 5; 5, when the back metal 1 is inserted from the back side to the front side, the tip of the built-in detection unit is positioned exactly on the wear allowable surface of the friction material 2.

At a position opposite to the outer peripheral surface of the base 9b, a pair of locking pins 18, 18 are provided so as to protrude. In addition, the back metal 1
A screw hole 19 is provided at a position near the mounting hole 5 on the rear surface of the back metal 1. A holding plate 20 for holding the wear indicator 9 on the backing metal 1 by a set screw 27 which can be screwed into the screw hole 19.
Is freely fixed to the back surface of the back metal 1 by bonding.

The holding plate 20 is formed by bending an intermediate portion of a plate having elasticity such as a stainless steel plate, and has a first plate 21 and a second plate 22. Circular holes 23, 23 through which the screw portion of the set screw 27 can be inserted are provided at the distal end portions of the two plate portions 21, 22, and the distal end portion 9a of the wear indicator 9 is provided at an intermediate portion of the first plate portion 21. Is formed, and a second through-hole 25 is formed from the intermediate portion of the second plate portion 22 to the base end thereof.

The second through hole 25 is provided between the base 9b of the wear indicator 9 and the pair of locking pins 18,
18, except that the width W is equal to or slightly larger than the outer diameter of the base 9b, and is larger than the distance D between the tip surfaces of the pair of locking pins 18, 18. And a length L. Further, locking recesses 26, 26 which can be engaged with the locking pins 18, 18 are formed on both sides of the second through hole 25 at an intermediate portion of the second plate portion 22. .

In the brake pad with a wear indicator of the present invention configured as described above, when the wear indicator 9 is mounted on the backing metal 1, first, the tip 9 a of the wear indicator 9 is inserted into the first through hole 24. , The second through hole 25
Similarly, the bases 9b are respectively inserted. At this time, the wear indicator 9 is rotated by 90 degrees with respect to the holding plate 20 from the state shown in FIG.
Is passed through the second through-hole 25, and the pair of locking pins 18, 18 are positioned between the first and second plate portions 21, 21, and the locking recesses 26, 26.

Next, as shown in FIG. 1, the tip 9a of the wear indicator 9 is inserted into the mounting hole 5 of the back metal 1 and the circular holes 2 at the tips of the first and second plate portions 21, 22 are inserted.
The setscrew 27 inserted through 3, 3 is screwed into the screw hole 19 formed in the back metal 1 and further tightened.

As a result, the second plate portion 2 having a spring function
The pair of locking pins 1 is formed by two locking recesses 26, 26.
8 and 18 are pressed against the backing metal 1, and the wear indicator 9 having the locking pins 18 and 18 fixed thereto is attached to the backing metal 1.
And is firmly supported and fixed. The first through hole 2
The fourth and second through holes 25 may be one continuous hole. Further, in order to connect and fix the tip portions of the first and second plate portions 21 and 22 to the back surface of the back plate 1, insert the protrusions provided on the back surface of the back plate 1 into the circular holes 23, It can also be performed by other conventionally known methods, such as caulking the part in a rivet shape.

[0027]

[Effect of the Invention] The brake pad with the wear indicator of the present invention is constructed and operated as described above, so that the wear indicator can be securely fixed to the back metal despite being able to be manufactured at a relatively low cost with a simple configuration. I can do it.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a holding plate.

FIG. 4 is a sectional view of a main part showing a first example of a conventional structure.

FIG. 5 is a sectional view of a main part showing a second example.

FIG. 6 is a perspective view of a support bracket.

[Explanation of symbols]

 Reference Signs List 1 back metal 2 friction material 3 brake pad 4 disk rotor 5 mounting hole 5a small diameter portion 5b large diameter portion 5c step 6 holding cylinder 7 step 8 locking notch 9 wear indicator 9a tip 9b base 9c slope 10 resin 11 conductive wire DESCRIPTION OF SYMBOLS 12 Lock pin 13 Compression spring 14 Step 15 Notch 16 Circular hole 17 Support bracket 18 Lock pin 19 Screw hole 20 Suppression plate 21 First plate portion 22 Second plate portion 23 Circular hole 24 First through hole 25 second through-hole 26 locking recess 27 locking screw

Claims (1)

(57) [Scope of request for utility model registration] 1. A back metal, a friction material attached to the surface of the back metal, a mounting hole formed to penetrate the front and back surfaces of the back metal, and a wear indicator having a built-in detection unit,
In the brake pad with the wear indicator, the wear indicator is supported by the back metal while the wear indicator is inserted through the mounting hole and the tip of the detection unit is positioned on the wear allowable surface of the friction material. The wear indicator includes a base portion having a larger diameter than a tip portion inserted into the mounting hole, a pair of locking pins protruding at a position opposite to the outer peripheral surface of the base portion, and a holding plate, The holding plate has first and second plate portions formed by bending an intermediate portion of the plate material, and a through hole through which a tip portion of the wear indicator can be inserted at least in the intermediate portion of the first plate portion. The base of the wear indicator is provided at least in the middle of the second plate portion with a through hole that can be inserted except for a pair of locking pins,
The tip of the wear indicator is inserted into the through-hole of the first plate, the base is inserted into the through-hole of the second plate, and the pair of pins is inserted into the first and second pins. While being located between the two plate portions, in a state where the tip portion is inserted into the mounting hole, the tip portion of the first and second plate portions,
A brake pad with a wear indicator, wherein the brake pad is attached and fixed to the back surface of the back metal.