JP3097012B2 - Holding structure of lead wire for wear indicator of hydraulic brake disc for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a lead wire of an electric wear indicator used for a hydraulic disc brake of an automobile or a motorcycle by using a brake hose.

[0002]

2. Description of the Related Art Wiring and hoses connected to a vehicle disk brake include a lead wire of an electric wear indicator for notifying the wear amount of a lining of a friction pad by an alarm sound or a warning light, and a hydraulic pressure of a caliper body. There is a brake hose for supplying pressurized hydraulic fluid to the chamber.
No. 46027 discloses a structure for mounting a brake hose, for example, as disclosed in Japanese Utility Model Laid-Open No. 4-105296.

In the former technique, a bracket to be bolted to a caliper body has a tongue portion having an elastic piece having a bolt insertion hole, and a disk access opening and closing portion of the caliper body adjacent to the tongue portion. And a plurality of lead wire holding cylinders formed on the heat shield plate to hold a lead wire for a wear indicator. In the latter technology, a union hole is formed in the union boss protruding from the caliper body, and a plate-shaped connecting bracket is interposed between the union boss and the hose banjo at the end of the brake hose. The brake hose is connected to the union hole. The connecting bracket has first and second detents projecting therefrom, and the first detent engaged with the outer peripheral surface of the union boss is engaged with another plane. By changing the fitting, the mounting direction of the brake hose in which the neck tube of the hose banjo is engaged with the second rotation preventing portion can be set in a plurality of directions with respect to the caliper body.

[0004]

However, in the case of the former, the lead wire and the brake hose are randomly routed in each direction, which is complicated particularly in a limited space for mounting a disc brake. Complicated, replacement of the friction pad and attachment and detachment of the brake hose were extremely poor workability. In addition, since a dedicated bracket is used to hold the lead wire, economy is poor, and the weight of the disc brake increases, and the unsprung weight increases.

The present invention has been made in view of such circumstances, and it is an object of the present invention to integrate a brake hose and a lead wire for a wear indicator into a caliper body, and to connect the lead wire together with the brake hose to a disc brake. Provide an inexpensive holding structure for a wear indicator lead wire of a hydraulic disc brake that can be collectively routed in a narrow mounting space and easily replace friction pads and attach / detach a brake hose. It is in.

[0006]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, the present invention provides a wear indicator for electrically detecting a wear amount of a lining on a friction pad provided on a caliper body of a disc brake. A connecting bracket is fixed to the outside of the union hole formed in the connecting hole, and a hose banjo at the end of a brake hose is prevented from rotating to the connecting bracket, and a union bolt inserted into the hose banjo and the connector bracket is inserted into the union hole. In the hydraulic disc brake for connecting the brake hose to the caliper body, the lead wire connected to the wear indicator is connected to the connecting bracket directly or by a relay coupler or bush provided on the lead wire. Equiped parts It is characterized in that allowed retention through.

[0007]

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

A hydraulic disc brake 1 includes a disc rotor 2 that rotates integrally with wheels (not shown), a caliper bracket 3 fixed to a vehicle body at one side of the disc rotor 2, and a caliper bracket 3 The disk rotor 2 is placed between a pin-slider type caliper body 5 supported by a pair of slide pins 4 and 4 so as to be movable in the disk axis direction, and an action portion 5a and a reaction portion 5b of the caliper body 5. It is composed of a pair of friction pads 6 and 6 that are arranged to face each other with the sandwiched therebetween.

The working portion 5a is provided with a cylindrical cylinder hole 7 opened to the disk rotor 2 side. A cup-shaped piston 8 is inserted into the cylinder hole 7 in a liquid-tight and movable manner. At the same time, a hydraulic chamber 9 is defined between the bottom wall 5c of the cylinder hole 7 and the piston 8. A union boss 5d protrudes from the bottom wall 5c of the cylinder hole 7, and a pair of mounting arms 5 is formed on the peripheral wall 5e of the cylinder hole 7 from both sides.
f and 5f are protruded, and a Brewder boss portion 5g is also protruded from the peripheral wall 5e of the cylinder hole 7 outward in the disk radial direction.

The union boss portion 5d is formed of a rectangular body having four flat surfaces on the outer periphery, and a union hole 10 communicating with the hydraulic pressure chamber 9 is provided inside the union boss portion 5d.
, A brake hose 11 is connected via a connecting bracket 12. The brake hose 11 is connected to a known hydraulic master cylinder (not shown) which is separately provided. The hydraulic hose pressurized by the hydraulic master cylinder is introduced into the hydraulic chamber 9 so as to advance the piston 8. It has become.

Each of the mounting arms 5f is provided with the slide pin 4 described above. Also, a 5 liter brewer boss is provided with a brewer hole (not shown) for discharging air mixed in the working fluid, and a brewer screw 13 is normally screwed into the brewer hole. The communication between the pressure chamber 9 and the outside is shut off.

The friction pads 6, 6 are provided with a lining 6 a slidably in contact with the side surface of the disk rotor 2 and ear pieces 6 c, 6 on both sides.
6c comprises a back plate 6b held by the caliper bracket 3. The back plate 6b of the working portion side friction pad 6 includes:
An electric wear indicator 14 is mounted.

The wear indicator 14 includes a buzzer, an indicator lamp, and a lead wire 15 arranged around the instrument panel in the driver's seat.
When the lining 6a reaches the wear limit, the lead wire 15 protruding from the tip of the wear indicator 14 slides on the disk rotor 2 and breaks.
The driver is notified of replacement of the friction pads 6 and 6 by an alarm sound or a warning light.

A relay coupler 17 held by the connecting bracket 12 is interposed on the lead wire 15 together with a hose banjo 16 fixed to an end of the brake hose 11. This relay coupler 17 is a female type 1
7a and a male mold 17b.
An insertion hole 17c for attachment and a tongue piece 17d are provided. The male mold 17b is connected to the wear indicator 14 side, and when the indicator 14 has been used, it can be replaced with the smallest unit up to the male mold 17b.

The connecting bracket 12 has a rectangular seat plate 12b having a slightly large-diameter through hole 12a at the center.
And two forked detent portions 12c, 12c that bend to one side from a pair of opposed side edges of the seat plate 12b, and another pair of opposite side edges of the seat plate 12b. It consists of rotation restricting pieces 12d, 12d that bend laterally. Each of the rotation preventing portions 12c is composed of a pair of sandwiching pieces 12e, 12e, and each of the rotation preventing portions 12c is provided with a protrusion 12f on the outer surface of the distal end portion.

The hose banjo 16 includes a ring body 16a attached to the caliper body 5, a fixed tube 16b fixed to the end of the brake hose 11 by caulking, and a small-diameter neck tube 16c connecting these at an intermediate portion. Consists of

Reference numeral 18 denotes a union bolt, 19, 2
Numeral 0 denotes a washer, and the hose banjo 16 is attached to the union hole 10 of the caliper body 5 with the union bolt 18 together with the connecting bracket 12.

In this embodiment, the connecting bracket 12 is configured as described above. The connecting bracket 12 is fitted into the through hole 12a of one washer 19 also serving as a sealing material, and the boss is formed by the rotation restricting pieces 12d. The seat plate 12b is laid on the seat surface 5h of the boss 5d with two planes facing the outer periphery of the portion 5d interposed therebetween.

The connecting bracket 12 includes:
The hose banjo 16 attaches the ring body 16a to the washer 1
9 while positioning the neck tube 16c with the rotation restricting pieces 12d, 12d of one of the detent portions 12c.
It is sandwiched between and stopped. The female mold 17a of the relay coupler 17 is attached to the other rotation preventing portion 12c by inserting the insertion hole 17c into the one holding piece 12e.

Then, the other washer 20 is placed on the outer surface of the ring body 16a of the hose banjo 16, and the washer 2
0, the union bolt 18 is connected to the ring body 16a of the hose banjo 16 and the connecting bracket 1
The union bolt 18 is screwed into the union hole 10 by inserting it into the second seat plate 12b and the washer 19, and these are integrally attached to the caliper body 5.

In the connecting bracket 12 attached in this manner, the pair of rotation restricting pieces 12d sandwich the two flat surfaces of the union boss portion 5d, so that there is no co-rotation when the union bolt 18 is screwed. Further, in the brake hose 11, the neck tube 16 of the hose banjo 16 is provided.
Since c is sandwiched between the sandwiching pieces 12e of the rotation preventing portion 12c, similarly to the connecting bracket 12, there is no co-rotation due to the screwing of the union bolt 18, and it is securely attached in a predetermined direction. .

On the other hand, the tongue piece 17d of the female mold 17a engages with the inside of the other washer 20, and the relay coupler 17 is prevented from being removed by the tongue piece 17d and the retaining projection 12f of the sandwiching piece 12e. . Also, the brake hose 11 and the lead wire 15 for the wear indicator are routed in the same direction inside the mounting space of the disc brake 1. It is preferable that the intermediate portion between the brake hose 11 and the lead wire 15 be combined by the fastener 21 because these can be more easily handled.

The present embodiment is configured as described above, and the lead wire 15 for the wear indicator is held by the intermediate coupler 17 using the connecting bracket 12 for the brake hose. It is economical because no special parts are required, and the weight of the disc brake 1 does not increase, so that the unsprung weight does not increase. Furthermore, since the brake hose 11 and the lead wire 15 are collectively collected and held on the connecting bracket 12, even in a narrow mounting space of the disc brake 1, there is no inconvenience, and the friction pad 6 and the wear indicator 14 are replaced or replaced. The attachment / detachment work of the brake hose 11 can be easily performed.

FIG. 5 shows a second modification of the first embodiment.
In the present embodiment, in the connecting bracket 12, a through hole 12a of a seat plate 12b is formed to have a smaller diameter than that of the first embodiment, and a retaining protrusion 12f is provided in each of the detent portions 1a.
It is provided facing the inner surface of the distal end of the sandwiching pieces 12e, 12e of 2c.

The lead wire 15 connected to the female mold 17a of the relay coupler 17 has flanges 30a at both ends.
In this embodiment, the insertion hole 17c and the tongue piece 17d of the female die 17a used in the first embodiment, and one washer 19 are omitted. .

In this embodiment, the lead wire 15 is connected to the elastic bush 30 by the holding pieces 12e, 12e of the other rotation preventing portion 12c.
e and is held by the connecting bracket 12. The axial movement of the elastic bush 30 is restricted by the flanges 30a, 30a.
2e, the protrusions 12f, 12f for retaining
Regulated by

In the above-described embodiment, the intermediary components such as the relay coupler and the elastic bush in the lead wire are held by the connecting bracket. However, in the present invention, the lead wire may be held directly by the connecting bracket. Further, in order to hold the lead wire, not only the detent portion of the brake hose may be used, but also a dedicated holding structure may be provided on the connecting bracket.

[0028]

According to the present invention, as described in the above embodiment, since the lead wire for the electric wear indicator is held by using the connecting bracket for the brake hose, it is possible to eliminate the need for special parts. It is economical and does not increase the weight of the disc brake, so that the unsprung weight does not increase.

Further, since the brake hose and the lead wire can be collectively collected on the connecting bracket, the brake hose and the lead wire are not complicated even in a narrow mounting space of the disc brake, and the friction pad, the wear indicator,
Replacement and attachment / detachment of the brake hose can be easily performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a disc brake showing a first embodiment of the present invention.

FIG. 2 is a front view of the disc brake showing the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is an exploded perspective view of a main part of a disc brake showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hydraulic disc brake 2 ... Disc rotor 3 ... Caliper bracket 5 ... Caliper body 5a ... Working part 5b ... Reaction part 5c ... Bottom wall of cylinder hole 7 5d ... Union boss part 5h ... Bearing surface of union boss part 5d 6 ... friction pad 6a ... lining 6b ... back plate 7 ... cylinder hole 8 ... piston 9 ... hydraulic chamber 10 ... union hole 11 ... brake hose 12 ... connecting bracket 12a ... through hole 12b ... seat plate 12c ... bifurcated detent part Reference numeral 12d: Rotation restricting piece 12e: Nipping piece constituting the detent part 12c 12f: Retaining projection 14 ... Electric wear indicator 15 ... Lead wire for wear indicator 16 ... Hose banjo 16a ... Ring body 16b ... Neck Tube 17: Relay coupler 17a: Female type of relay coupler 17 17b: Relay coupler 17 Male type 17c Insert hole 17d Tongue piece 18 Union bolt 19, 20 Washer 21 Fastener

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 66/02 B60R 16/02 B60T 17/04

Claims (1)

(57) [Claims] 1. A wear indicator for electrically detecting a wear amount of a lining is attached to a friction pad provided on a caliper body of a disc brake, and a connecting bracket is fixed outside a union hole formed in the caliper body. At the same time, the hose banjo at the end of the brake hose is prevented from rotating to the connecting bracket, and a union bolt inserted into the hose banjo and the connector bracket is screwed into the union hole, and the brake hose is attached to the caliper body. In the hydraulic disc brake to be connected, the connecting bracket holds an intermediary part such as a lead wire connected to the wear indicator or a relay coupler or a bush provided on the lead wire. Vehicle disc Rake wear indicator lead wire holding structure.