JP2004225727A - Disk brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a friction pad from dropping out of a caliper bracket when temporarily assembling the friction pad in a caliper support arm of the caliper bracket. <P>SOLUTION: Lug pieces 12a and 12a are protruded at both sides of a back plate 12 of the friction pad 6. The lug pieces 12a and 12a are supported in pad guide grooves 3c and 3c installed in caliper support arms 3a and 3a of the caliper bracket 3 via a pad retainer 20. Pad drop-out preventing parts 20c and 20c projecting into a counter disk rotor side of the lug pieces 12a and 12a are provided in a pad retainer 20. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk brake for a vehicle used in a vehicle such as an automobile or a motorcycle, and more particularly to a pad retainer structure for supporting a back plate lug of a friction pad with a pad guide groove of a caliper support arm.
[0002]
[Prior art]
Conventionally, the lugs projecting from both sides of the back plate of the friction pad are supported on the pad guide grooves formed on the caliper support arm of the caliper bracket, and the friction pad is suspended so that it can move in the disk axis direction. Generally, in a disc brake to be held, a pad retainer formed of a thin metal plate is interposed between a pad guide groove and an ear piece. The pad retainer is provided with a pad return mechanism that abuts against the side surface of the lug for turning out / in the disk rotor and urges the lug toward the side opposite to the disk rotor in parallel with the disk axis direction. The mechanism forcibly retracts the friction pad from the disk rotor during non-braking to prevent drag of the friction pad and judder generated due to wear of the disk rotor, thereby suppressing brake squeal (for example, see Patent Document 1). ).
[0003]
[Patent Document 1]
JP-A-56-129624 (Page 1, FIG. 5, FIG. 6)
[0004]
[Problems to be solved by the invention]
However, in the above-described device, the pad return mechanism urges the friction pad toward the disk rotor side. Therefore, when the friction pad is temporarily assembled to the pad guide groove of the caliper support arm, the friction pad is moved toward the disk rotor side. And it may fall out of the caliper support arm, and it takes time to assemble.
[0005]
Therefore, the present invention provides a vehicle disk brake that can prevent the friction pad from dropping off from the caliper bracket when the friction pad is temporarily assembled to the caliper support arm of the caliper bracket, and can improve the assemblability. It is an object.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a caliper bracket fixed to a vehicle body, extending a pair of caliper support arms straddling the outer edge of a disk rotor in a disk axial direction, and forming pad guide grooves in both caliper support arms. Ear pieces are provided on opposite sides of a back plate of the friction pad provided to face each other with the disk rotor interposed therebetween, and the ear pieces are supported on the pad guide grooves via a pad retainer. In a vehicle disk brake provided with a pad return mechanism for forcibly pulling a friction pad from a disk rotor, the pad retainer is provided with a pad falling-off preventing portion protruding from the lug to the side opposite to the disk rotor. .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 8 show a first embodiment in which the present invention is applied to a pin-slide type disc brake. A disc brake 1 comprises a disc rotor 2 rotating integrally with wheels and one side of the disc rotor 2. A caliper bracket 3 fixedly mounted on the vehicle body, and a caliper body 5 supported on the caliper support arms 3a, 3a of the caliper bracket 3 via a pair of slide pins 4, 4 so as to be movable in the disk axial direction. A pair of friction pads 6, 6 are disposed inside the working portion 5 a and the reaction portion 5 b of the caliper body 5, facing each other with the disk rotor 2 interposed therebetween.
[0008]
The caliper body 5 includes the above-described working portion 5a and reaction portion 5b disposed on both sides of the disk rotor 2, and a bridge portion 5c connecting these members across the outer edge of the disk rotor 2. The action portion 5a is provided with cylinder holes 7, 7 which are open on the disk rotor 2 side. Each of the cylinder holes 7 accommodates a cylindrical piston 8 having a bottom. Each of the pistons 8 moves the cylinder hole 7 toward the disk rotor by the pressure liquid supplied to the hydraulic chamber 9 at the bottom of each cylinder hole. It is supposed to. At the side of the action portion 5a, vehicle body mounting arms 5d, 5d protrude, and at the tip of each vehicle body mounting arm 5d, the above-mentioned slide pin 4 is protruded with a mounting bolt 10, respectively. ing.
[0009]
The caliper support arms 3a, 3a straddle the outer edge of the disc rotor 2 in the disc axial direction from both sides of the caliper bracket 3 while sandwiching both sides of the bridge portion 5c. The shape extends along the side wall toward the center of the disk. The distal ends of the caliper support arms 3a, 3a are connected by tie rods 3b to increase the rigidity of both support arms 3a, 3a to which a braking torque is applied.
[0010]
A guide hole 11 for accommodating the slide pin 4 is formed in each caliper support arm 3a, and four pads facing each other on both sides of the disc rotor 2 are formed in both caliper support arms 3a, 3a. A guide groove 3c is provided. Each pad guide groove 3c is formed in a U-shape having an outer surface 3d in the disk radial direction, an inner surface 3e in the disk radial direction, and an opposing surface 3f connecting these two side surfaces 3d, 3e. Ear pieces 12a, 12a protruding from both sides of the plate 12 are supported via pad retainers 20 in the pad guide grooves 3c, 3c on the disk inlet side and the disk outlet side, respectively.
[0011]
The pad retainer 20 has a pair of retainer portions 20a, 20a laid in the pad guide grooves 3c, 3c on both sides of the disk rotor on the disk entrance side or the disk exit side, and a pad return connected to the retainer portions 20a, 20a. Parts 20b, 20b (pad return mechanism of the present invention) and pad drop prevention parts 20c, 20c, connecting pieces 20d that straddle the outer edge of the disk rotor 2 and connect the upper parts of the retainers 20a, 20a, and the caliper support arms 3a. And a mounting piece 20e locked in the rotor groove 3g.
[0012]
Each retainer portion 20a includes an inner receiving piece 20f and an outer receiving piece 20g facing inward and outward in the disk radial direction with the ear piece 12a of the friction pad 6 interposed therebetween, and a side piece 20h connecting these two pieces 20f, 20g. .
[0013]
On the side opposite to the disk rotor of each side piece 20h, an elongated piece is extended outward in the radial direction of the disk, and the elongated piece is bent back in an arc shape toward the disk rotor to form an elastic loop portion 20i. The distal end side of the piece further extends toward the disk rotor to form a pad resilient portion 20j, and the elastic loop portion 20i and the pad resilient portion 20j constitute the pad return portions 20b, 20b. Each pad elastic portion 20j has a length sufficient to move the ear pieces 12a of the friction pad 6 from the time when the lining 13 is new to the time when the lining 13 is fully worn, and separates from the side piece 20h. And is formed so as to be bent in a curved shape along the extending direction.
[0014]
Each inner receiving piece 20f has an elongated piece extending outward in the radial direction of the disk on the side opposite to the disk rotor, and the elongated piece is bent back in an arc shape toward the disk rotor to form pad falling-off preventing portions 20c, 20c. Have been. Furthermore, insertion guide pieces 20k are provided on the outer side of the inner and outer receiving pieces 20f, 20g and the side piece 20h on the side opposite to the disk rotor so that the lugs 12a, 12a of the friction pad 6 can be easily inserted. I have to.
[0015]
In the pad retainer 20 formed in this manner, the inner receiving piece 20f and the outer receiving piece 20g of each retainer portion 20a are respectively formed on the inner surface 3e in the disk radial direction and the outer surface 3d in the disk radial direction of each pad guide groove 3c. The side piece 20h is laid on the facing surface 3f of the pad guide groove 3c. In each of the friction pads 6, 6, the lugs 12a, 12a of the back plate 12 are inserted into the pad guide grooves 3c, 3c on the desk entry / exit side, and the outer faces 12b, 12b of the lugs 12a, 12a in the disk radial direction. And the inner surfaces 12c, 12c of the disk in the radial direction are brought into contact with the outer receiving pieces 20g, 20g and the inner receiving pieces 20f, 20f of the retainer portions 20a, 20a, respectively. It is brought into contact with the resilient parts 20j, 20j. With this attachment, the elastic loop portions 20i, 20i and the pad drop-off preventing portions 20c, 20c are disposed on the side of the lugs 12a, 12a opposite to the disk rotor.
[0016]
The present embodiment is formed as described above, and when the friction pads 6 are temporarily assembled to the caliper support arms 3a, 3a of the caliper bracket 3, the pad drop-off preventing portions 20c, 20c are opposed to the ear pieces 12a, 12a. By protruding from the disk rotor side, even if the lugs 12a, 12a in contact with the pad repelling portion 20j are pressed toward the anti-disk rotor side, the pad drop-off preventing portions 20c, 20c can be formed on the lug 12a. , 12a can be prevented from coming off, and the friction pad 6 can be prevented from falling off, and the assemblability of the friction pad 6 can be improved. Further, since the elastic loop portions 20i, 20i are also arranged on the side of the ear pieces 12a, 12a opposite to the disk rotor, it is possible to more reliably prevent the friction pads 6 from falling off from the caliper support arms 3a, 3a. A caliper body 5 having pistons 8, 8 inserted therein is assembled to a caliper bracket 3 in which friction pads 6, 6 are temporarily assembled, and a disk rotor 2 is disposed between the friction pads 6, 6.
[0017]
When the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 9 by the driver's braking operation, the disc brake 1 causes the pistons 8, 8 to advance through the cylinder holes 7, 7, and the friction pad on the action portion 5a side. 6 is pressed against one side surface of the disk rotor 2 rotating in the direction of arrow A. Next, the caliper body 5 is moved in the direction of the action portion 5a by the reaction force while being guided by the slide pins 4 and 4, and the reaction force claw 5e moves the friction pad 6 on the reaction portion 5b side to the other side of the disk rotor 2. Press At this time, the ear pieces 12a, 12a of each friction pad 6 have outer surfaces 12b, 12b in the disk radial direction and inner surfaces 12c, 12c in the disk radial direction, the outer receiving members 20g, 20g and the inner receiving member 20a of the retainer portions 20a, 20a. Guided by 20f, 20f, respectively, the end faces 12d, 12d of the ear pieces 12a, 12a move smoothly in the pad guide grooves 3c, 3c while pressing the pad repelling portions 20j, 20j against the side pieces 20h, 20h.
[0018]
On the other hand, when the above-described braking operation is released and the pistons 8, 8 and the reaction force claw 5e retreat to the positions before the start of braking, the elastic loop portions 20i, 20i and the pad repelling portions 20j, 20j establish initial initial positions. In order to return to the shape, the lugs 12a, 12a in contact with the pad repelling portions 20j, 20j are pressed against the disk rotor, and the friction pads 6 are forcibly separated from the side surfaces of the disk rotor 2. . Accordingly, it is possible to prevent the friction pads 6 from being dragged, and to effectively suppress the judder generated due to the wear of the disk rotor 2 and the brake squeal.
[0019]
When the lining 13 of the friction pad 6 is worn, the friction pad 6 gradually advances toward the disk rotor 2, and the lugs 12a, 12a are moved from the elastic loop portions 20i of the pad resilient portions 20j, 20j. Although it comes into contact with the distal end side and the resilience from the elastic loop portion 20i decreases, the pad resilience portion 20j is formed by curving in a curved shape. Thus, the friction pad 6 can be reliably separated from the side surface of the disk rotor 2 irrespective of the state of wear of the lining 13.
[0020]
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the pad retainer 21 of the present embodiment, the pad receiving preventing portions 21c and 21c having a resilient function and the pad resilient portions 21d and 21d are continuously provided on the inner receiving pieces 21b and 21b of the retainer portions 21a and 21a. The pad return portion (pad return mechanism of the present invention) is formed by the pad drop prevention portion 21c and the pad repelling portion 21d.
[0021]
The retainer portions 21a, 21a include the inner receiving pieces 21b, 21b, outer receiving pieces 21e, 21e opposed to the inner receiving pieces 21b, 21b, and side pieces 21f connecting the two receiving pieces. The upper portions of 21a, 21a are connected by a connecting piece 21g, and a mounting piece 21h is formed on the connecting piece 21g to be engaged with the rotor groove 3g of the caliper support arm 3a. Insertion guide pieces 21i are formed on the outer receiving pieces 21e, 21e.
[0022]
The pad drop-off prevention portion 21c rebounds the elongated piece extending horizontally from the inner receiving piece 21b in the direction opposite to the disk rotor into an arc shape from the outer side in the disk radial direction toward the disk rotor, and forms a loop to resiliently. Hold power. Further, the distal end side of the elongated piece extending in the disk rotor direction from the pad falling-off preventing portion 21c is defined as a pad repelling portion 21d. The pad repelling portion 21d has a length sufficient to move the ear pieces 12a of the friction pad 6 from the time when the lining 13 is new to the time when the lining 13 is fully worn, and gradually extends outward in the disk radial direction. It is formed to be inclined and to bend in a curved shape along the extension direction.
[0023]
In the pad retainer 21 formed in this manner, the inner receiving piece 21b and the outer receiving piece 21e of each retainer portion 21a are respectively formed on the inner surface 3e in the disk radial direction and the outer surface 3d in the disk radial direction of each pad guide groove 3c. The side piece 20h is laid on the facing surface 3f of the pad guide groove 3c. In each of the friction pads 6, the lugs 12a of the back plate 12 are inserted into the pad guide grooves 3c, and the outer faces 12b of the lugs 12a in the disk radial direction are formed on the outer receiving pieces of the retainers 21a. 21e, 21e, and the disc inner side surfaces 12c, 12c of the ear pieces 12a, 12a are attached to the pad resilient portions 21d, 21d. By this mounting, the pad drop-off preventing portions 21c, 21c are arranged on the side of the lugs 12a, 12a opposite to the disk rotor.
[0024]
In this embodiment, during braking, the lugs 12a of the friction pads 6 are guided by the outer receiving faces 21e of the retainer portions 21a, and the outer faces 12b in the radial direction of the disc are guided by the outer receiving pieces 21e of the retainers 21a. The radially inner side surfaces 12c, 12c move smoothly in the pad guide grooves 3c, 3c while pressing the pad resilient portions 21d, 21d against the inner receiving pieces 21b, 21b. The pad repelling portions 21d press the inner side surfaces 12c of the lugs 12a in the disk radial direction toward the outer side surfaces 3d and 3d of the pad guide grooves 3c in the disk radial direction. The radially outer surfaces 12c, 12c of the discs are constantly pressed against the radially outer surfaces 3d, 3d of the pad guide grooves 3c, 3c.
[0025]
On the other hand, at the time of the above-described braking release, the ear pieces 12a that are in contact with the pad popping portions 21d, 21d so that the pad drop-off preventing portions 21c, 21c and the pad popping portions 21d, 21d try to return to their initial shapes. , 12a are pressed against the disk rotor side to forcibly separate each friction pad 6 from the side surface of the disk rotor 2. Further, similarly to the first embodiment, even if the lining 13 of the friction pad 6 is worn, the pad resilient portions 21d, 21d are formed to bend in a curved shape along the extending direction. , Can compensate for this reduced elasticity.
[0026]
In this embodiment, since the pad drop-off preventing portions 21c also have the function of the pad drop-off preventing portion, the assemblability of the friction pad 6 can be improved at low cost without increasing the number of components.
[0027]
It should be noted that the present invention is not limited to the above embodiments, and it is possible to form the existing pad retainer by combining the pad fall prevention portion of the present invention, and the shape of the pad fall prevention portion is also a loop shape. Any shape can be used without limitation. Further, in each of the above embodiments, the pad retainer is provided integrally with the pad return portion serving as the pad return mechanism of the present invention. However, the pad return mechanism may use a well-known pad separate from the pad retainer. No problem.
[0028]
【The invention's effect】
As described above, according to the vehicle disc brake of the present invention, when the friction pad is temporarily assembled to the caliper bracket, it is possible to prevent the friction pad from falling off from the caliper bracket, so that the assembling can be performed without any trouble. In addition, the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along line II of FIG. 7; FIG. 2 is a sectional front view of a main part of a disc brake showing a first embodiment of the present invention. FIG. 3 is a main view of a disc brake showing a first embodiment of the present invention. FIG. 4 is a perspective view of a pad retainer showing a first embodiment of the present invention. FIG. 5 is a partial cross-sectional front view of a disk brake showing a first embodiment of the present invention. FIG. 7 is a front view of a disc brake showing a first embodiment of the present invention. FIG. 8 is a plan view of a disc brake showing a first embodiment of the present invention. FIG. 9 is a second embodiment of the present invention. FIG. 10 is a cross-sectional side view of a main part of a disc brake showing an embodiment. FIG. 10 is a perspective view of a pad retainer showing a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3c ... Pad guide groove, 3d ... Disc radial outer surface, 3e ... Disk radial direction inner surface, 3f ... Opposing surface, 5 ... Caliper body, 5a ... working part, 5b ... reaction part, 5c ... bridge part, 6 ... friction pad, 7 ... cylinder hole, 8 ... piston, 12 ... back plate, 12a ... ear piece, 12b ... disk radial outer surface, 12c: Disk inner surface in the radial direction, 12d: End surface, 13: Lining, 20, 21: Pad retainer, 20a, 21a: Retainer portion, 20b: Pad return portion, 20c, 21c: Pad falling prevention portion, 20f, 21b: Inside Receiving piece, 20g, 21e: Outer receiving piece, 20h, 21f: Side piece, 20i, 21c: Elastic loop part, 20j, 21d: Pad spring

Claims (1)

A pair of caliper support arms that extend across the outer edge of the disk rotor in the disk axis direction are extended on a caliper bracket fixed to the vehicle body, and pad guide grooves are provided on both caliper support arms so as to face each other. Ear pads are respectively provided on both sides of the back plate of the friction pad to be provided, and the ear pads are supported in the pad guide grooves via pad retainers, and the friction pads are forcibly pulled back from the disk rotor. A disc brake for a vehicle provided with a return mechanism, wherein the pad retainer is provided with a pad falling-off preventing portion protruding from a side of the ear piece opposite the disc rotor.

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