JPH0684032U - Friction pad return structure for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] The friction pad during non-braking is reliably pulled back from the side surface of the disc rotor to effectively prevent uneven wear of the lining and brake squeal. [Structure] A disc radial direction outer side surface 13b of an ear piece 13a of a friction pad 6 is gradually inclined away from the disc axis in the direction opposite to the disc rotor direction. Pad retainer 1
4, an outer receiving piece 14e parallel to the disc axis and a pad elastic piece 14h inclined so as to gradually approach the disc axis in the direction opposite to the disc rotor are formed. Pad shot piece 1
4h is the innermost side surface 13 of the friction pad 6 in the disk radial direction.
Then, the outer receiving piece 14e is locked to the outer radial surface 13b of the ear piece 13a in the disk radial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake used in a vehicle such as an automobile or a motorcycle. More specifically, friction pads disposed on both sides of the disc rotor so as to be movable in the disc axial direction are forced from the disc rotor when not in operation. Of the friction pad that can effectively prevent uneven wear of the lining and squeal of the brake.

[0002]

[Prior art]

 Examples of the structure for returning the friction pad include those shown in Japanese Utility Model Publication No. 61-2826 and Japanese Utility Model Publication No. 60-21566.

In the former technique, a reciprocating spring is formed by a substantially V-shaped base formed by bending a wire in two stages and a locking portion formed by bending both ends of the base in the same direction, and the apex angle of the base is formed. The slightly inclined part is extended in the direction away from the friction pad to engage with the rotor groove of the caliper body, and the locking parts at both ends are small holes drilled on the outer surface of the friction pad in the radial direction of the disk. Is fitted to.

In the latter technique, two pad retainers and one pad spring are combined to form a holding metal fitting, and the pad retainer has a locking portion attached to the back plate of the friction pad, A bending portion that projects from the locking portion toward the back surface of the back plate, and a pressing plate that is folded back from the bending portion toward the locking portion and that is pressed against the caliper support arm are provided. On the other hand, the pad spring has a loop part that applies a spring force in the lengthwise direction to the middle part, and bending parts for engagement at both ends, and each pad retainer is connected to the disc entry side of the back plate. The pad spring is engaged with the locking hole of the pad retainer.

These techniques apply the elastic force of the return spring or pad spring to the friction pad in the direction away from the disc rotor, forcibly separating the friction pad during non-braking from the side surface of the disc rotor, It is designed to prevent uneven wear and brake squeal due to dragging of the lining.

[0006]

[Problems to be solved by the device]

 In these configurations, the return spring and the pad spring are mounted eccentrically on the outer side of the friction pad in the disk radial direction and on the disc entry side, so the return force to the friction pad acts as an eccentric load. To do.

Therefore, in the former case in which the return spring is attached to the outer surface of the friction pad in the radial direction of the disc, the rear spring pushes the outer side of the friction pad in the radial direction of the disc so as to incline toward the anti-disc rotor side. A rotational moment is generated in the pad, and on the inner side in the radial direction of the disc, on the contrary, it approaches the disc rotor and the lining is dragged by the disc rotor.

On the other hand, in the latter type in which the holding metal is attached to the disc turning-in side of the friction pad, the pad spring pushes and opens the disc turning-in side of the friction pad to the side opposite to the disc rotor, so that a rotational moment is applied to the friction pad. As a result, the disc feeding side approaches the disc rotor and is dragged by the disc rotor as in the former case, neither of which was able to sufficiently prevent uneven wear of the lining and brake squeal.

The present invention has been made in view of the above circumstances, and it is possible to reliably pull back the friction pad during non-braking from the side surface of the disc rotor to effectively prevent uneven wear of the lining and brake squeal. It is intended to provide a pad return structure.

[0010]

[Problems to be solved by the device]

 In accordance with the above-mentioned object, in the first invention, a pair of caliper support arms that straddle the outer side of the disc rotor in the disc axial direction are extended on the caliper bracket fixed to the vehicle body, and the pad guide portions are provided on both caliper support arms. Discs for vehicles, which are provided so as to face each other and have ear pieces projecting from both sides of the back plate of the friction pad arranged so as to sandwich the disc rotor, and the ear pieces are supported by the pad guide portions via pad retainers. In the brake, the outer side surface of the ear piece in the radial direction of the disc is gradually inclined away from the disc axis toward the anti-disc rotor direction, and the pad retainer is provided with an outer receiving piece parallel to the disc axis and an anti-disc side. A pad elastic piece that inclines so as to gradually approach the disk axis in the rotor direction, and the pad elastic piece is the innermost side surface of the friction pad in the disk radial direction. Together to abut, the disk radially outer surface of the ear piece, supported in front Kisotogawa receiving piece.

Further, in the second invention, a pair of caliper support arms extending over the outside of the disc rotor in the disc axial direction is extended to a caliper bracket fixed to the vehicle body, and the pad guide portions are provided on both caliper support arms. For the vehicle in which the ear pieces are provided on both sides of the back plate of the friction pad disposed so as to sandwich the disc rotor, and the ear pieces are supported by the pad guide section via the pad retainers. In the disc brake, the disc radial direction outer side face of the ear piece and the disc radial direction innermost side face of the friction pad are respectively inclined so as to gradually move away from the disc axis in the anti-disc rotor direction, and the pad retainer, An outer receiving piece parallel to the disc axis and a pad elastic piece are formed, and the pad elastic piece is brought into contact with the innermost side surface of the friction pad in the radial direction of the disk. In addition, the outer surface of the ear piece in the radial direction of the disk is supported by the outer receiving piece.

[0012]

[Action]

 The friction pad arranged on the side of the disk rotor is held parallel to the side surface of the disk rotor by the back surface of the back plate contacting the piston and reaction claw of the caliper body, and The disc rotor side corner portion is supported by the pad resilient piece of the pad retainer, and the non-disc rotor side corner portion of the disk radial outer surface of the ear piece is supported by the outer retainer piece of the pad retainer. Further, the elastic force of the pad elastic piece acts on the friction pad outward in the radial direction of the disc, and the pad is elastically held by the pad elastic piece and the outer receiving piece.

When braking, the friction pad moves in the disc rotor direction while pushing the pad elastic piece inward in the disc radial direction. After the braking operation is released, the friction pad restores to the disk radial outer side with the disk innermost side surface of the friction pad, the disk radial outer side surface of the ear piece, or the pad elastic piece inclination. It is pushed back toward the disc rotor side by the pad elastic pieces.

When the piston for pushing the friction pad or the reaction force claw retreats, the friction pad tends to incline. The inclination of the friction pad is the innermost side surface in the disk radial direction or the disk radial direction outer side of the ear piece. Due to the slanted shape of the side surface and the pad elastic piece, it is directed toward the disk rotor side opposite to the disk rotor side corner point of the disk rotor innermost side surface closest to the disk rotor, and does not project to the disk rotor side.

[0015]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

The disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A when the vehicle is running, a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2, A caliper body 5 supported by the caliper support arms 3a, 3a of the caliper bracket 3 so as to be movable in the disc axial direction via a pair of slide pins 4, 4, and a working portion 5a and a reaction portion 5b of the body 5. It is composed of a pair of friction pads 6 and 6 which are opposed to each other with the disc rotor 2 interposed therebetween.

The caliper body 5 is a split type in which a pair of caliper halves 5d and 5e are integrally connected by four connecting bolts 7, and one caliper half 5d is arranged on one side of the disc rotor 2. The caliper half 5e is composed of the entire acting portion 5a provided, and the other caliper half 5e includes a reaction portion 5b arranged on the other side portion of the disc rotor 2 and a bridge portion arranged straddling the outside of the disc rotor 2. It consists of 5c.

A cylinder hole 8 having an opening on the disk rotor 2 side is provided in the action portion 5 a, and a cylindrical piston 9 having a bottom is housed in the cylinder hole 8. The piston 9 is a cylinder hole bottom portion. The cylinder hole 8 is moved toward the disk rotor by the pressure liquid supplied to the hydraulic chamber 10. Further, vehicle body mounting arms 5f, 5f are provided on the side portions of the action portion 5a, and the above-mentioned slide pin 4 is attached to the mounting bolt 11 at the tip of each vehicle body mounting arm 5f. Installed.

The friction pad 6 is configured by joining a lining 12 that is in sliding contact with the side surface of the disk rotor 2 and a metal back plate 13 held by the caliper support arms 3a and 3a. Suspending ears 13a, 13a are provided on both sides of the back plate 13, and the disc radial direction outer side surface 13b of each ear piece 13a is an inclined surface that expands outward as the distance from the lining 12 increases. Has become.

The caliper support arms 3 a, 3 a straddle the outside 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 5 c, and further on the other side of the disc rotor 2. It has a shape extending along the side wall of the reaction portion 5b toward the center of the disk. The tip ends of the caliper support arms 3a, 3a are connected by a tie bar 3b to enhance the rigidity of both support arms 3a, 3a to which a braking torque is applied.

Each caliper support arm 3a is provided with a guide hole 3c for accommodating the above-mentioned slide pin 4, and both caliper support arms 3a, 3a are provided on the respective side portions of the disc rotor 2. Four pad guide portions 3d facing each other are provided. The pad guide portion 3d has a so-called upper jaw having a protruding piece 3e on the outer side in the radial direction of the disc, and each friction pad 6 includes the ear pieces 13a and 13a of the back plate 13 on the pad guide portion on the disc entry side and the entry side. 3d, 3d is supported via a pad retainer 14 so as to be movable in the disc axial direction.

The pad retainer 14 includes a pair of retainer portions 14a, 14a fitted to the pad guide portions 3d, 3d on both sides of the disc rotor on the disc entry side or the delivery side, and the retainer portions 14a, 14a. The upper part is composed of a connecting piece 14b that straddles the outer side of the disk rotor 2 and pad springs 14c and 14c extended to the retainer parts 14a and 14a.

Each retainer portion 14a is formed by connecting one end portion of the inner receiving piece 14d and the outer receiving piece 14e facing inward and outward in the disc radial direction with a side piece 14f. The inner receiving piece 14d and the outer receiving piece 14e are connected to each other. A gap wider than that of the ear piece 12a is set between the pad guide portion 3d and the pad guide portion 3d. When the pad guide portion 3d is fitted, the inner and outer receiving pieces 14d, 14e is in close contact with the inner wall surface of the pad guide portion 3d and is arranged parallel to the disc axis.

The pad spring 14c includes a spring piece 14g inclined from the tip of the inner receiving piece 14d to the inner side in the disk radial direction, and a substantially semicircular pad provided at the tip of the spring piece 14g so as to be inclined with respect to the disk axis. It consists of a shell 14h. When the pad elastic pieces 14h, 14h are fitted to the pad guide portion 3d with the retainer portion 14a and the pad retainer 14 is assembled to the caliper support arm 3a, as the pad elastic portions 14h and 14h move away from the disc rotor 2, respectively. It is installed so that it approaches the disk axis.

The ear pieces 13a of the friction pad 6 are housed between the inner receiving piece 14d and the outer receiving piece 14e of the retainer portion 14a fitted to the pad guide portion 3d, and the disc radius of each ear piece 13a is accommodated. The direction outer surface 13b is arranged so as to be inclined away from the disc axis in the direction opposite to the disc rotor direction.

Further, the pad elastic pieces 14 h wrap around the inner side of the back plate 13 in the disk radial direction. As described above, since the pad elastic pieces 14h are inclined so as to approach the disk axis in the direction opposite to the disk rotor direction, the disk rotor side corner portion of the innermost side surface 13c of the back plate 13 in the disk radial direction. 13d and elastically rubs the friction pad 6 outward in the radial direction of the disc, and the anti-disc rotor side corner portion 13e is supported by the outer receiving piece 14e of the retainer portion 14a on the disc radial outer surface 13b of the ear piece 13a. To be done.

In this way, the friction pad 6 is supported by the pad retainer 14 at the diagonal portions of the inner and outer surfaces in the radial direction of the disk, but on the side of the acting portion 5a, the back surface of the back plate 13 is the tip surface of the piston 9. On the reaction portion 5b side, since the back surface of the back plate 13 contacts the reaction force claw 5g, both friction pads 6 and 6 are elastically held parallel to the side surface of the disk rotor 2 and play during running and braking. It is prevented from sticking.

The present embodiment is configured as described above, and when the hydraulic fluid that has been increased in pressure is supplied to the hydraulic chamber 10 by the braking operation of the driver, the piston 9 advances in the cylinder hole 8 and The friction pad 6 on the acting portion 5a side is pressed against one side surface of the disc rotor 2. Next, the reaction force causes the caliper body 5 to move in the direction of the working portion 5a while being guided by the slide pins 4 and 4, and the reaction force claw 5g moves the friction pad 6 on the reaction portion 5b side toward the disc rotor 2. Press on the other side. At this time, on both sides of the friction pads 6 and 6, the pad elastic pieces 14h of the pad retainer 14 are pushed open toward the inner side in the radial direction of the disk by the movement of the ear pieces 13a.

On the other hand, when the above-described braking operation is released and the piston 9 and the reaction force claw 5g retreat to the position before the start of braking, the pad elastic piece 14h returns to the outside in the disk radial direction. Since the pad elastic pieces 14h are inclined so as to approach the disc axis in the anti-disc rotor direction, as they return to the disc radial direction outer side, the inclined surface causes the friction pad 6 to move in the anti-disc rotor direction. Retreat to.

In the friction pad 6, the innermost side surface 13c of the back plate 13 in the disk radial direction and the outer side surface 13b of the ear piece 13a in the disk radial direction are diagonally opposed to the corner portion 13d of the disk rotor and the anti-disk. Since it is supported by the pad elastic piece 14h and the outer receiving piece 14e at two points on the rotor side corner portion 13e, even if the piston 9 and the reaction force pawl 5g retreat, the inclination is the maximum in the disc radial direction. The inner surface 13c is on the side opposite to the disk rotor with the corner 13d on the disk rotor side as a fulcrum, and does not partially project to the disk rotor 2 side.

In this embodiment, the elastic force of the pad elastic pieces 14 h acts on the friction pad 6 whose braking has been released in this way to urge the friction pad 6 away from the disk rotor 2 and Since it does not partially project in the two directions, the friction pad 6 can be reliably pulled back from the side surface of the disc rotor 2, and uneven wear of the lining 12 and brake squeal can be effectively prevented. .

FIG. 6 shows a second embodiment of the present invention. In the pad elastic piece 14h of this embodiment, the rubber sheet 20 is attached to the outer surface, and the inner receiving piece 14d and the outer receiving piece 14h. 14e together with the disc axis.

On the other hand, in the friction pad 6, the innermost side surface 13c of the back plate 13 in the disk radial direction and the outer side surface 13b of the ear piece 13a in the disk radial direction are parallel to each other so as to gradually move away from the disk axis in the direction opposite to the disk rotor. The innermost side surface 13c of the disk in the radial direction of the disk has the disk rotor side corner 13d as the pad elastic piece 14h, and the outer surface 13b of the ear piece 13a has the anti-disk rotor side corner 13e as the pad. The rubber sheet 20 is supported by the outer receiving pieces 14e of the guide portion 3d.

In the present embodiment, the disk radial outer side surface 13b of the back plate 13 released from braking is moved to the disk rotor 2 side by the high frictional force of the rubber sheet 20 attached to the pad elastic piece 14h. By preventing slippage, uneven wear of the lining 12 and brake squeal can be prevented more effectively.

[0035]

[Effects of the Invention] The present invention is configured as described above so that the friction pad at the time of releasing the braking is surely pulled back from the side surface of the disc rotor, and the friction pad released from the braking is inclined. However, the inclination is toward the side opposite to the disk rotor with the corner near the disk rotor on the innermost side in the radial direction of the disk as the fulcrum, and it does not even partially project to the disk rotor side. Uneven wear of the lining and brake squeal can be effectively prevented.

Further, since the pad returning operation is performed by using the pad retainer attached to the pad guide portion, a dedicated member as in the prior art is not required, which is excellent in economical efficiency and assembling property.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially sectional plan view of a disc brake showing a first embodiment of the present invention.

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

FIG. 5 is a perspective view of a pad retainer.

FIG. 6 is a cross-sectional side view of essential parts of a disc brake showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 3a ... Caliper support arm 3d ... Pad guide part 5 ... Caliper body 5a ... Action part 5b ... Reaction part 5g ... Reaction force claw 6 ... Friction pad 8 ... Cylinder hole 9 ... Piston DESCRIPTION OF SYMBOLS 10 ... Hydraulic chamber 12 ... Lining of friction pad 6 13 ... Back plate of friction pad 6a ... Ear piece 13b protruding to the side of back plate 13 ... Outer surface 13c of disc 13a of ear piece 13a ... Back plate 13 Disk radial innermost side surface 13d ... Disk radial innermost side surface 13c disk rotor side corner 13e ... Disk radial outer side surface 13b opposite disk rotor side corner 14 ... Pad retainer 14a ... Retainer portion 14c ... Pad spring 14d ... Inner receiving piece 14e ... Outer receiving piece 14f ... Side piece 14g ... Spring piece 14h ... Pad bullet Piece 20 ... rotational direction of the rubber sheet A ... disk rotor 2

Claims (2)

[Scope of utility model registration request] 1. A caliper bracket fixed to a vehicle body is provided with a pair of caliper support arms extending outside the disc rotor in the disc axial direction, and pad guide portions are provided so as to oppose the caliper support arms. A disc brake for a vehicle, wherein ear pieces are provided on both sides of a back plate of a friction pad disposed with a disc rotor interposed therebetween, and the ear pieces are supported by the pad guide portion via a pad retainer. The outer surface of the disk in the disk radial direction is gradually inclined away from the disk axis in the direction opposite to the disk rotor, and the pad retainer is provided with an outer receiving piece parallel to the disk axis and gradually approaching the disk axis in the direction opposite to the disk rotor. An inclined pad elastic piece is formed, the pad elastic piece is brought into contact with the innermost side surface of the friction pad in the radial direction of the disc, and the ear piece is formed. The outer surface of the disk in the radial direction is
A structure for returning a friction pad for a vehicle disc brake, wherein the structure is supported by the outer receiving piece. 2. A caliper bracket fixed to the vehicle body is provided with a pair of caliper support arms extending over the outer side of the disk rotor in the disk axial direction, and pad guide portions are provided facing both caliper support arms. A disc brake for a vehicle, wherein ear pieces are provided on both sides of a back plate of a friction pad disposed with a disc rotor interposed therebetween, and the ear pieces are supported by the pad guide portion via a pad retainer. The outer surface of the friction pad in the radial direction of the disk and the innermost surface of the friction pad in the radial direction of the disk are gradually inclined away from the disk axis in the direction opposite to the disk rotor, and the pad retainer has an outer receiving piece parallel to the disk axis. And a pad elastic piece, the pad elastic piece is brought into contact with the innermost side surface of the friction pad in the radial direction of the disk, and the disc of the ear piece is formed. A friction pad returning structure for a vehicle disc brake, wherein an outer side surface in the radial direction is supported by the outer receiving piece.