JPH10213167A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pad spring of one-piece structure advantageous from the viewpoint of assemble easiness, productivity and cost while ensuring required set load necessary for friction pads. SOLUTION: A pad spring 16 is provided with pad pressing pieces 16a, 16b for pressing the disc radial outer side faces of friction pads 4, 4, a connecting piece 16d continuous with the pad pressing pieces 16a, 16b, reinforcing pieces 16f, 16f making a detour around the anti-disc-rotor side of the friction pads 4, 4 so as to be continuous with the pad pressing pieces 16a, 16b, and four cover parts 16e for covering the disc radial outer side of the friction pads 4, 4. Pin contact parts brought into elastic contact with the disc radial inner side face of a hanger pin 15 are formed at the center of the connecting piece 16d and reinforcing pieces 16f, 16f. Reaction from the hanger pin 15 is imparted as spring force inward into a disc, from the connecting pieces 16d and reinforcing pieces 16f, 16f to the pad pressing pieces 16a, 16b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile and an automobile.
The present invention relates to a disc brake mounted on a traveling vehicle such as a tricycle, and more particularly to a disc brake of a type in which a friction pad is suspended using a hanger pin.

[0002]

2. Description of the Related Art In a vehicle disk brake of a type in which a pair of friction pads is suspended from a caliper body by using a hanger pin, a plate-shaped pad spring is contracted outside the friction pad in the radial direction of the disk. The pad is urged inward by a pad spring to prevent the friction pad from rattling due to running vibration and from floating outside the disk during braking. As a disk brake, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 5-180250.

In this disc brake, a hanger pin erected on a caliper body is inserted into a suspension piece of a friction pad, a pair of friction pads are arranged on both sides of a disc rotor, and a pair of pad holding pieces are attached to a pad spring. And a connecting piece for connecting both pad suppressing pieces, and the center of the connecting piece arranged in the disk circumferential direction outside the disk rotor is elastically contacted with the inner surface of the hanger pin in the disk radial direction,
The friction pads are urged inwardly of the disc by bringing both pad pressing pieces into contact with the disc entry side and the ejection side of the friction pad in the radial direction of the disc.

[0004]

In such a structure, the set load acting on the friction pad from the pad holding piece is maintained by securing a certain width to the connecting piece of the pad spring. The friction pads on both sides of the disk rotor are gradually adjusted toward the disk rotor as the lining wears, and when the entire lining is fully worn, the back plates of both friction pads directly contact the disk rotor. Since the connecting piece of the pad spring is sandwiched between the suspending pieces of the friction pad, the connecting piece cannot be made wider than the thickness of the disk rotor.

[0005] Therefore, in the above-mentioned disc brake,
The required set load necessary to suppress the friction pad is secured by superimposing and using two pad springs having substantially the same shape. However, such a two-layered structure causes an increase in unsprung load. In addition, it is disadvantageous in terms of assemblability, productivity and cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle disk brake in which a set load acting on a friction pad is sufficiently ensured in a pad spring having a single-plate structure to solve the above-mentioned problems. .

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the above-mentioned object, a method in which a ceiling opening through which a friction pad is inserted / removed is inserted into and out of a bridge portion of a caliper body which is disposed across the outside of a disk rotor. And a hanger pin erected on the caliper body passing through the ceiling opening in the axial direction of the disc is inserted into a pad hanging piece of the friction pad, and a pair of friction pads are opposed to each other on both sides of the disc rotor. A pad spring that urges the friction pad inwardly of the disk with a pad spring and presses the pad spring against a radially outer surface of the friction pad in the radial direction of the disk; A vehicle disc provided with a connecting piece disposed between the hanging pieces of the pad in the circumferential direction of the disc and elastically in contact with the inner surface of the hanger pin in the radial direction of the disc; In the rake, the pad spring bypasses the friction pad opposite to the disk rotor side and continues to the pad holding piece, and resiliently contacts the disk radial inner surface of the hanger pin on the friction pad opposite to the disk rotor side. Further, a reinforcing piece for providing a reaction force from the hanger pin as a resilient force inward of the disc is provided on the pad holding pieces on the disc revolving side and the disc revolving side. According to this configuration, the reinforcing piece of the pad spring is disposed on the side of the friction pad opposite to the disk rotor, and does not hinder the friction pad that adjusts in the direction of the disk rotor as the lining wears. Therefore, the reinforcing piece can have a set load that is insufficient for the connecting piece whose lateral width is limited to the thickness of the disk rotor.

The pad spring may be provided integrally with a cover for covering the friction pad in the radial direction of the disk. The cover makes it difficult for water or earth and sand to enter the inside of the caliper body. Malfunction due to rust and rust is effectively suppressed, and durability can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a first embodiment of the present invention, in which a disk brake 1 includes a disk rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A, and a vehicle body at one side of the disk rotor 2. A fixed four-pot opposed caliper body 3 and a working part 3 of the caliper body 3
A pair of friction pads 4 and 4 are disposed between the pair of friction pads a and 3b with the disk rotor 2 interposed therebetween.

The caliper body 3 includes a pair of caliper halves 3d and 3e integrally formed with each of the action portions 3a and 3b, each half of a bridge portion 3c disposed over the outside of the disk rotor 2. A cup-shaped piston 9 is inserted in a liquid-tight manner into four large and small cylinder holes 8 provided opposite to the action portions 3a and 3b, respectively. A hydraulic chamber 10 is defined between each piston 9 and the bottom of the cylinder hole 8.

The one working portion 3a on the vehicle body mounting side has a union hole 11 for introducing the hydraulic fluid into the hydraulic chamber 10 on the disc outlet side, and a bleeder for discharging air mixed in the hydraulic fluid. A screw 12 is provided. The two hydraulic chambers 10 of the action section 3a communicate with each other through a liquid through hole (not shown), and two hydraulic chambers 1 opposed to the disk inlet side and the disk outlet side with the disk rotor 2 interposed therebetween.
0 and 10 are two liquid through holes 1 penetrating the bridge portion 3c.
They communicate at 3,13.

At the center of the bridge portion 3c, rectangular ceiling openings 14 are formed on both sides of the disk rotor 2 so as to penetrate the inside and outside of the disc rotor 2 in such a size that the friction pads 4, 4 can be inserted and removed. The action section side walls 3f, 3f of the ceiling opening 14 are recessed lower than the side walls on the side where the disk enters and exits, and separate guide grooves 3 are provided on the side of the action section side walls 3f, 3f where the disk enters.
g and 3g are recessed, and bosses 3h and 3i for attaching hanger pins projecting from the outer surfaces of the action portions 3a and 3b are provided at the center of the outside of the action portion side walls 3f and 3f, respectively. It extends to almost the same height as the side wall on the side.

[0013] Torque receiving portions 3j, 3j, which are vertically divided, are provided on the disk inlet and outlet sides of the disk rotor side surfaces of the action portions 3a, 3b. Each friction pad 4 accommodates the lining 5 and the main body 6a of the back plate 6 between the torque receiving portions 3j, 3j, and the hanging pieces 6b located in the ceiling opening portion 14. In the pin hole 6c of the ceiling opening 14
Is hung movably in the disk axial direction on the front surface of the pistons 9, 9 by passing through the hanger pins 15 erected on the bosses 3 h, 3 i. The disc is urged inward by a pad spring 16 engaged between the discs.

The union hole 11 is connected to a separate hydraulic master cylinder via a brake hose (both not shown). The hydraulic fluid pressurized by the hydraulic master cylinder by the driver's brake operation is The fluid is supplied to the four hydraulic chambers 10 through the union holes 11, each piston 9 is pushed toward the opening of the cylinder hole 8, and the lining 5 of each friction pad 4 is pressed against the side surface of the disk rotor 2, thereby braking. The action is performed.

The pad spring 16 is a pair of long and short parallel pad holding pieces 16a, 1 formed in a crank shape in cross section.
6b, flat portions 16c, 16c which are continuous with the inner portion as a part of the pad suppressing pieces 16a, 16b, and both flat portions 16c.
a connecting piece 16d for connecting the centers of
6c, 16c, four cover portions 16e projecting across the connecting piece 16d, and reinforcing pieces projecting from the side ends of the flat plate portions 16c, 16c in a substantially trapezoidal shape, bypassing the outside of the opposing cover portions 16e, 16e. 16f, 16f.

One pad suppressing piece 16a is formed slightly longer than the width of the ceiling opening 14 in the disk axis direction, and the other pad suppressing piece 16b is also slightly larger than the width of the ceiling opening 14 in the disk axis direction. It is formed short. The center connecting piece 16d is formed to have the same width as the thickness of the disk rotor 2 or a width slightly smaller than the thickness thereof. An arc-shaped pin contact portion 16g is recessed.
An intermediate portion of the reinforcing pieces 16f, 16f parallel to the connecting piece 16d is located outside the pad suppressing pieces 16a, 16b and the flat plate portion 16c, and a pin contact of the connecting piece 16d is provided at the center of the intermediate portion. Pin contact portion 16h having the same shape as portion 16g,
16h is recessed on the same straight line as the pin contact portion 16g of the connecting piece 16d.

The pad spring 16 inserts the friction pads 4 and 4 from the ceiling opening 14 into both sides of the disk rotor 2, and then moves the pad holding pieces 16 a and 16 b into the back plates 6 and 6 in the ceiling opening 14. Of the main body portions 6a, 6a of the main body portions 6a, 6a, are accommodated in the guide grooves 3g, 3g of the bridge portion 3c. . This allows
The center connecting piece 16d is located along the outside of the disk rotor 2, and the reinforcing pieces 16f, 16f on both sides are connected to the ceiling opening 1.
4 are located outside the action portion side walls 3f, 3f.
A plurality of cover portions 16e are disposed so as to cover the outer sides of the friction pads 4 and 4 in the disk radial direction while sandwiching the hanging pieces 6b of the back plate 6.

Next, the connecting piece 16d and the reinforcing pieces 16f, 16
f while pressing the center part of the disk inward into the disk.
After hanging the hanger pins 15 around the h and 3i and suspending the friction pads 4 and 4, the connecting pieces 16d and the reinforcing pieces 16f and
When the pressing of the hanger pin 16f is released, the pin abutting portion 16g of the connecting piece 16d is attached to the hanger pin 1 outside the disk rotor 2.
5, the reinforcing pieces 16f, which resiliently contact the radially inner surface of the disk 5 and bypass the friction pads 4, 4 on the side opposite to the disk rotor.
Similarly, the pin contact portions 16h, 16h of 16f elastically contact the inner surface of the hanger pin 15 in the disk radial direction. The connecting piece 16d and the reinforcing pieces 16f, 1 elastically contacting the hanger pin 15
The reaction force from the hanger pin 15 acts on 6f, and this reaction force is further applied to the pad holding pieces 16a and 16b which are applied to the outer disk reciprocating side end and the revolving side end of the back plates 6 and 6, respectively. Is transmitted as elastic force toward the
Are urged inwardly of the disk by the resilience applied to the pad holding pieces 16a and 16b.

The resilient force acting on the pad suppressing pieces 16a, 16b is determined not only by the set load set on the central connecting piece 16d, but also by the reinforcing pieces 16f, 16f on both sides so that the lateral width is within the thickness of the disk rotor 2. Insufficient set load acts on the connecting piece 16d limited to the above, so that it is possible to effectively prevent the friction pads 4 and 4 from rattling and floating during braking. Further, since both reinforcing pieces 16f, 16f are arranged so as to bypass the friction pads 4, 4 on the side opposite to the disk rotor, the friction pads 4, 4 adjust in the direction of the disk rotor as the lining 5 wears. Even if the lining 5 is fully worn and both back plates 6 and 6 are positioned so as to directly sandwich the disk rotor 2, the connecting piece 1 of the pad spring 16
6d and the reinforcing pieces 16f, 16f do not hinder braking.

As described above, the pad spring 16 of the present embodiment can have a required set load necessary for suppressing the friction pads 4 and 4 while having a single-plate structure.
Compared to the conventional two-layer structure, the unsprung load can be reduced by weight reduction, and the productivity of the pad spring 16 and the ease of assembling to the caliper body 3 are improved.
It is also advantageous in terms of cost.

Further, four cover portions 16e provided on the pad spring 16 sandwich the hanging piece 6b of the back plate 6,
Since it covers the friction pads 4 and 4 in the radial direction of the disk,
Water and earth and sand are less likely to enter the inside of the caliper body 3, and operation failure of the disc brake 1 due to adhesion of earth and sand and rust can be effectively suppressed, and durability can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

The disc brake 20 includes a disc rotor 2, a caliper bracket 21 fixed to the vehicle body at one side of the disc rotor 2, and a caliper bracket 21.
Slide-type caliper body 22 slidably supported in the axial direction of the disk and a pair of friction pads opposed to each other with the disk rotor 2 interposed between the action portion 22a and the reaction portion 22b of the caliper body 22 23, 2
Has three.

The caliper body 22 is provided with the above-described working portion 22.
a and a reaction portion 22b, and a bridge portion 22c for connecting these over the outside of the disk rotor 2. The action part 22a is provided with the cylinder hole 8 and the piston 9, the hydraulic chamber 10, the union hole 11, and the bleeder screw 12, and the reaction part 22b is provided with a reaction force claw 22d. A slide pin 2 for guiding the slide of the caliper body 22 is provided on the disc outlet side of the bridge portion 22c.
4 is inserted in the disk axis direction, and the bridge portion 22
At the center of c, a rectangular ceiling opening 25 is provided slightly larger in the axial direction of the disk than the friction pads 4, 4 arranged on both sides of the disk rotor 2.

The friction pads 23, 23 receive the lining 26 and the main body 27a of the back plate 27 in front of the piston 9 and the reaction force claw 22d, and have pin holes in the hanging pieces 27b located in the ceiling opening 25. 27c, the hanger pin 15 which penetrates through the ceiling opening 25 in the disk axis direction and is erected on the bosses 22e and 22f is inserted, and is hung movably in the disk axis direction. The disk is urged inward by a pad spring 28 interposed therebetween.

The pad spring 28 is formed in a rectangular shape whose size is substantially entirely accommodated in the ceiling opening 25. The pad spring 28 has a pair of parallel pad holding pieces 28a, 28a, Pad holding pieces 28a, 2
8a, a connecting piece 28b for connecting substantially the center, a reinforcing piece 28c for connecting one side of the pad holding pieces 28a, 28a, and a connecting piece 28b and a reinforcing piece 2 from the pad holding pieces 28a, 28a.
Cover portions 28d, 28d protruding opposite to each other between 8c
And the connecting piece 2 from the other side of the pad holding pieces 28a, 28a.
Cover portions 28e, 28e protruding to the outside of
Are provided.

Covers 28d, 28d, 28e, 28e
Of the connecting piece 28b and the reinforcing piece 2
8c, cover portions 28d, 28d
Are formed wider than the outer cover portions 28e, 28e. The connecting piece 28b connected to the approximate center of the pad holding pieces 28a, 28a bypasses the wide cover parts 28d, 28d, so that the middle part is the outer cover part 28e, 28e.
It is deviated to the side. Also, the connecting piece 28b and the reinforcing piece 28c
Is formed in the shape of a mountain that is gently inclined outward, and pin contact portions 28f and 28g having the same arc shape as the outer diameter of the hanger pin 15 are recessed in the middle portion serving as the top.

The pad spring 28 inserts the friction pads 4, 4 into both sides of the disc rotor 2 from the ceiling opening 25, and then places the pad holding pieces 28 a, 28 a in the ceiling opening 25 on the back plates 27, 27. Body parts 27a, 27
a, the reinforcing piece 28c is disposed at the working portion side end of the ceiling opening 25, and the outer cover portions 28e, 28e are attached to the ceiling opening 25. While sandwiching the hanging piece 27b at the reaction portion side end of
It is disposed so as to cover the outer side in the disk radial direction of the back plate 27 on the reaction portion side. Further, the connecting piece 28 of the pad spring 28
b is disposed so as to cover the lining 26 outside the friction pad 23 on the reaction portion side in the disk radial direction, and the wide cover portions 28d, 28d are suspended outside the friction pad 23 on the operation portion side in the disk radial direction. While sandwiching the piece 27b,
It is disposed so as to cover from the back plate 27 of the friction pad 23 on the action section side to the disk rotor 2.

The pin abutting portions 28f and 28g of the connecting piece 28b and the reinforcing piece 28c are provided in elastic contact with the inner surface of the hanger pin 15 in the radial direction of the disk, respectively.
The reaction force from No. 5 acts on the pad holding pieces 28a and 28b as a set load set on the connecting piece 28b and the reinforcing piece 28c, and both of the friction pads 4 and 4 are repelled inward of the disk.

The disc brake 20 of the present embodiment is configured as described above. When the lining 26 of the friction pad 23 is initially set to be not worn, the caliper body 22 is set.
Are located as shown in FIGS. 5 to 7. In this state, the connecting piece 28b of the pad spring 28 is deviated to the outside of the lining 26 of the friction pad 23 on the reaction portion side which has come off from the disk rotor 2 as described above, and the reinforcing piece 28c is In FIG. 25, the friction pad 23 on the working portion side is arranged so as to bypass the side opposite to the disk rotor.

Further, when the pressurized hydraulic fluid is supplied to the hydraulic chamber 10 by the driver's braking operation, the piston 9 moves through the cylinder hole 8 toward the opening, and the friction pad 23 on the action portion 22a side. Is pushed toward the disk rotor to press the lining 26 against one side surface of the disk rotor 2. The caliper body 22 receives the braking reaction force, and
a, the reaction force claw 22d of the reaction portion 22b pushes the friction pad 23 on the reaction portion 22b side toward the disk rotor, and presses the lining 26 against the other side surface of the disk rotor 2, thereby providing a braking action. Is performed.

As the lining 26 of the friction pad 23 wears, the caliper body 22, the friction pad 23 and the pad spring 28 on the reaction portion 22b side are integrally adjusted in the direction of the action portion 22a. At the stage of full wear, the connecting piece 28b of the pad spring 28 moves to the outside of the disk rotor 2 as shown in FIG.

Accordingly, even if the backing plates 27 of the friction pads 23 are positioned so as to directly sandwich the disk rotor 2 due to the full wear of the lining 26, the connecting piece 28 b of the pad spring 28 is connected to the disk rotor 2. The friction piece 2c moves outward and the reinforcing piece 28c is
3, the pad spring 28 does not hinder braking. Further, since the reinforcing piece 28c can be provided with a set load that is insufficient for the connecting piece 28b, the same effect as that of the first embodiment can be achieved in this embodiment.

The present invention can also be applied to a disc brake in which a friction pad is suspended by two hanger pins. In this case, an appropriate number of intermediate portions between parallel connecting pieces and reinforcing pieces are provided. A pad spring with a structure that is connected with the pad holding pieces of the above, the pad holding pieces are hung over the radially outer surfaces of both friction pads in the disk radial direction, and both ends of the connecting piece and the reinforcing piece are
Assemble the two hanger pins by elastically contacting the inner surfaces in the disk radial direction.

[0035]

According to the vehicle disc brake of the present invention, while the pad spring is constituted by a single plate as described above, the set load which is insufficient for the connecting piece whose width is limited to the plate thickness of the disc rotor is not applied. By supplementing with a reinforcing piece, the required set load required to suppress the friction pad on the pad spring can be secured, and the reinforcing piece of the pad spring is arranged on the anti-disk rotor side of the friction pad, There is no hindrance to the friction pad that adjusts in the direction of the disk rotor as the lining wears.
Compared with the conventional two-layer structure, the unsprung load can be reduced by reducing the weight, and the pad spring is excellent in productivity and assemblability to the caliper body, and is advantageous in terms of cost. .

Further, by providing the pad spring with a cover portion that covers the friction pad in the radial direction of the disk, water and earth and sand can hardly enter the inside of the caliper body, and the operation of the disk brake due to adhesion of earth and sand and rust can be prevented. Can be effectively suppressed, and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a disc brake showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1, showing a first embodiment of the present invention;

FIG. 3 is a sectional view taken along the line III-III of FIG. 2, showing a first embodiment of the present invention;

FIG. 4 is a perspective view of a pad spring showing a first embodiment of the present invention.

FIG. 5 is a partial cross-sectional plan view of a disc brake showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, showing a second embodiment of the present invention;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, showing a second embodiment of the present invention;

FIG. 8 is a perspective view of a pad spring showing a second embodiment of the present invention.

FIG. 9 is a cross-sectional side view of a disc brake according to a second embodiment of the present invention with a lining fully worn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... 4-pot facing caliper body 3a, 3b ... Working part 3c ... Bridge part 3f ... Working part side wall of ceiling opening 14 3h, 3i ... Boss part for attaching a hanger pin 3j ... Torque receiving part 4 Friction pad 5 Lining 6 Back plate 6a Back plate 6 main body 6b Hanging piece of back plate 6 6c Pin hole 14 Ceiling opening 15 Hanger pin 16 Pad spring 16a 16b: Pad suppressing piece 16d: Connecting piece 16e: Cover part 16f: Reinforcing piece 16g, 16h: Pin contact part 20: Disc brake 22: Pin slide type caliper body 22a: Working part 22b: Reaction part 22c: Bridge part 22d ... Reaction force claws 22e, 22f ... Boss parts for attaching hanger pins 23 ... Friction pads 24 ... Slide pins 25 ... Top Well opening 26 ... Lining 27 ... Back plate 27a ... Back plate 27 main body 27b ... Back plate 27 hanging piece 27c ... Pin hole 28 ... Pad spring 28a ... Pad holding piece 28b ... Connection piece 28c ... Reinforcement piece 28d, 28e: Cover portion 28f, 28g: Pin contact portion A: Rotation direction of disk rotor 2

Claims (2)

[Claims] 1. A ceiling opening through which a friction pad is inserted and removed is provided in a bridge portion of a caliper body disposed across the outside of a disk rotor so as to penetrate inside and outside, and the ceiling opening is penetrated in the disk axial direction. The hanger pin installed on the caliper body is inserted into the pad hanging piece of the friction pad, and a pair of friction pads are arranged on both sides of the disk rotor so as to face each other. The pad spring is urged and the pad spring presses the outer surface of the friction pad in the radial direction of the disc, and the suspension piece of the friction pad is arranged in the circumferential direction of the disc continuously from the pad presser. And a connecting piece elastically contacting the inner surface of the hanger pin in the radial direction of the disk. The friction pad circumvents the anti-disk rotor side and continues to the pad holding piece, and the friction pad resiliently contacts the inner surface of the hanger pin in the disk radial direction on the anti-disk rotor side to reduce the reaction force from the hanger pin. A disc brake for a vehicle, wherein reinforcing pieces are provided on the pad holding pieces on the disc revolving side and the disc revolving side to apply elastic force inward of the disc. 2. A disc brake for a vehicle according to claim 1, wherein said pad spring is provided with a cover portion for covering the friction pad outside in a disc radial direction.