JPH0654930U - Caliper body for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the rigidity of the reaction force pawl to prevent brake squeal during braking. Effectively prevent uneven wear of the lining. [Structure] A pair of reaction force claws 5d, 5d are provided on a reaction portion 5b of a caliper body 5. Notch 5 at the tip of reaction force claw 5d
f is formed, and a female screw hole 5g is formed in the notch 5f.
Bolt through holes 10a, 10 are provided at both ends of the strength member 10.
a is drilled. Bolt through holes 10a, pitch P of 10a
1 is made slightly narrower than the pitch P2 of the female screw holes 5g and 5g, and when the strength member 10 is bolted to the reaction force claws 5d and 5d, the tension in the disk circumferential direction is applied to the both reaction force claws 5d and 5d. Set the initial stress (preload) that causes the inward action.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk brake for vehicles having a plurality of reaction force pawls on a reaction portion of a caliper body, and in particular, variation in the pad pushing force of the reaction force pawl against a friction pad on the reaction portion side and unique vibration The present invention relates to a caliper body structure that is suppressed to prevent the brake squeal during braking.

[0002]

[Prior art]

 In a caliper body that is integrally molded with a casting mold, the reaction force claws of the reaction portion are divided into multiple parts for cutting the cylinder hole and attaching and detaching the piston. However, in such a reaction force claw, the area of contact with the friction pad is small, so the surface pressure is high at the part of the friction pad that contacts the reaction force claw, and conversely at the parts other than the reaction force claw. Of the caliper body as described in Japanese Utility Model Laid-Open No. 62-151441, for example.

In this technique, the tips of a pair of reaction force claws provided in the reaction portion are interconnected by a strength member, and the strength member is provided with a pad pressing portion located between the reaction force claws. By expanding the pad pressing area between the reaction force claws, uneven wear of the lining is prevented.

[0004]

[Problems to be solved by the device]

 However, in such a configuration, the reaction force claws are simply connected by the strength members, and the rigidity is not improved so much.The reaction force claws on the disc entry side and the delivery side do not increase the pad pressing force. Since there are variations and vibrations at different frequencies depending on the braking reaction force from the friction pad, there is a problem that the brake squeal occurs during braking.

The present invention has been made in view of such circumstances, and an object thereof is to surely increase the rigidity of the reaction claw so that the pad pressing force and the natural vibration of the reaction claw vary. The object of the present invention is to provide a caliper body for a vehicle disc brake which can prevent squeaking during braking by effectively eliminating uneven wear of the lining.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the first invention, the action portion and the reaction portion, which are arranged opposite to each other on both sides of the disc rotor, are connected by a bridge portion that straddles the outside of the disc rotor, and the reaction portion is connected to the reaction portion. In a caliper body of a disc brake for a vehicle having a plurality of reaction force claws in the radial direction of the disk, a strength member is hung over the plurality of reaction force claws for bolting, and a reaction force claw into which a connecting bolt is inserted and a strength member. The initial stress in the disk circumferential direction is set in advance on each of the reaction force claws by changing the pitch of the bolt holes.

In the second invention, an elastic material such as rubber is provided between the reaction force claws of the strength member so as to be flush with the disk rotor side surface of the reaction force claw, and the elastic material is provided on the reaction portion side friction pad. It is in contact with the back plate of.

[0008]

[Action]

 In the first invention, a plurality of reaction force claws are integrally connected by a strength member, and the reaction force claws are set to have an initial stress due to tension in the circumferential direction of the disk to have resistance to external force and immediate rigidity. Thus, the reaction force claw can obtain a higher rigidity force than simply being connected by a strength member, and can suppress variations in pad pressing force and vibration frequency.

Further, in the second invention, similarly to the conventional example, the elastic material between the reaction force claws expands the pad pressing area to improve the reduction of the surface pressure, and at the same time, the vibration of the reaction portion side friction pad is reduced. Absorb.

[0010]

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention, in which a disc brake 1 is a disc rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A, and one of the disc rotor 2 The caliper bracket 3 fixed to the vehicle body on the side, the caliper body 5 supported by the caliper bracket 3 so as to be slidable in the disc axial direction through the pair of slide pins 4 and 4, and the caliper bracket 5 of the caliper bracket 5. The action portion 5a and the reaction portion 5b are composed of a pair of friction pads 6 and 6 which are arranged to face each other with the disc rotor 2 interposed therebetween.

The caliper body 5 includes the acting portion 5 a and the reaction portion 5 b described above, and a bridge portion 5 c that connects the caliper body 5 a and the reaction portion 5 b across the outside of the disc rotor 2. A cylinder hole 7 is provided in the action portion 5a so that the disk rotor side is opened, and a cylindrical piston 8 having a bottom is inserted in the cylinder hole 7 in a liquid-tight manner, and the bottom portion of the cylinder hole 7 and the piston 8 is provided. A hydraulic chamber 9 is defined in between. Further, a pair of reaction force claws 5d and 5d extending inward in the radial direction of the disc are formed separately on the reaction portion 5b, and the tips of both reaction force claws 5d and 5d are connected by a strength member 10. There is.

The friction pad 6 includes a lining 11 that is in sliding contact with the disc rotor 2 and a back plate 12 held by the caliper bracket 3. These friction pads 6 and 6 are provided on both sides of the back plate 12. The ear pieces 12a, 12a protruding in the direction are supported by the pad guide portions 3a, 3a provided to face the caliper bracket 3 so as to be movable in the disc axial direction via the pad retainers 13, respectively.

A union hole 14 for introducing hydraulic fluid is formed in the bottom wall 5e of the cylinder hole 7, and the hydraulic fluid whose pressure has been increased by the driver's braking operation is transferred from the union hole 14 to the pressure fluid chamber 9. When the pressurized liquid is supplied, the volume of the hydraulic chamber 9 gradually increases, and the piston 8 is pushed out of the cylinder hole 7 toward the disc rotor, and the piston 8 moves toward the friction pad 6 on the working portion 5a side. Is pressed against one side surface of the disc rotor 2. Next, the caliper body 5 slides to the action portion 5a side by the guide of the slide pins 4 and 4, and both reaction force claws 5d and 5d move the friction pad 6 of the reaction portion 5b to the other side surface of the disc rotor 2. When pressed, the braking action is performed.

Between the reaction force claws 5d and 5d, there is a gap 15 in which both ends of a semicircle are tapered inward in the radial direction of the disc, and the cylinder hole 7 of the action portion 5a is formed by casting the caliper body 5. Later, the piston 8 is cut through the gap 15, and the piston 8 is housed in the cylinder hole 7 between the cylinder hole 7 and the reaction force pawls 5d, 5d. The reaction claws 5d and 5d are tapered from the shape of the gap 15 toward the inner side in the radial direction of the disk, and each of the notches 5f is formed at the tip thereof, and each notch 5f has a female screw hole 5g. Drilled.

The strength member 10 is an arc-shaped plate material having the center of rotation of the disk rotor 2 as a fulcrum, and has bolt through holes 10a, 10a formed at both ends thereof. The strength member 10 has both ends fitted into the notches 5f, 5f of the reaction force claws 5d, 5d, and the respective bolt through holes 10a are aligned with the female screw holes 5g of the reaction force claw 5d. The connecting bolt 16 inserted into the bolt through hole 10a from the anti-disc rotor side is screwed into the female screw hole 5g to connect the reaction force claws 5d and 5d.

The pitch P1 of the bolt through holes 10a, 10a of the strength member 10 is slightly narrower than the pitch P2 of the female screw holes 5g, 5g of the reaction force claw 5d, and P1 <P2. For this reason, the tips of the reaction force claws 5d and 5d are brought inward with respect to each other by the strength member 10 that is bolted, and the tension in the circumferential direction of the disk is inwardly applied to both reaction force claws 5d and 5d. The initial stress (preload) to be applied to is set.

Due to the initial stress thus set, the reaction force claws 5d and 5d secure a higher rigidity force than simply connecting them with the strength member 10, and the disk circumferential direction and the disk axis orthogonal thereto are secured. Movement in the direction is restricted. As a result, the reaction force claws 5d and 5d have a high rigidity force even if the braking force in the disc circumferential direction and the braking reaction force from the friction pad 6 on the reaction portion side are varied in the pad pressing force and individual vibration frequencies. The brake squeal during braking can be prevented as much as possible.

In particular, in this embodiment, since the strength member 10 is formed in the shape of an arc along the rotation of the disc rotor 2, the individual movements of the reaction force claws 5d, 5d due to the braking torque are further suppressed. Therefore, the effect of preventing brake squeal is high. Further, since the rigidity is improved, the reaction force claws 5d, 5d are less likely to open outward, so that the set braking force can be effectively exerted.

FIG. 5 shows a second embodiment of the present invention, which differs from the first embodiment in that the strength member 10 is provided with an elastic material 17 for filling the gap 15 between the reaction force claws 5d, 5d. Is different. The elastic member 17 is made of rubber or soft synthetic resin and is fixed to the strength member 10 by a bonding means such as adhesion or baking. The disk rotor side surface of the elastic member 17 is flush with the inner side surfaces of the reaction force claws 5d, 5d, and the pad pressing area against the reaction portion side friction pad 6 is expanded to prevent uneven wear of the lining 11. At the same time, the vibration from the friction pad 6 is absorbed by the elastic material 17 to further suppress the brake squeal.

In the above embodiment, the pitch of the bolt holes on the strength member side is made narrower than the pitch of the bolt holes of the reaction force claw. You may set the initial stress which makes the tension of the disk circumferential direction act outward. Further, the present invention can be applied to a multi-pot type caliper body having three or more reaction force claws. Furthermore, the strength member may have a shape other than that of the embodiment.

[0022]

[Effect of device]

 As described above, according to the present invention, the strength members are stretched over a plurality of reaction claws to stop the bolts, and the pitches of the reaction force claws into which the connecting bolts are inserted and the bolt holes of the strength members are changed. By setting the initial stress in the disk circumferential direction in advance on the force pawls, the rigidity of the reaction force pawls is increased and natural vibrations are eliminated, so it is possible to effectively prevent the brake squeal during braking. .

Further, an elastic material such as rubber is provided between the reaction force claws of the strength member so as to be flush with the disk rotor side surface of the reaction force claw, and the elastic material is brought into contact with the back plate of the friction pad on the reaction portion side. As a result, the pad pressing area against the reaction part side friction pad is expanded together with the reaction force claw to prevent uneven wear of the lining and the vibration from the friction pad is absorbed by the elastic material, so brake squeal is more effectively suppressed. can do.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a cross-sectional plan 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 4 ... Slide pin 5 ... Caliper bracket 5a ... Action part 5b ... Reaction part 5c ... Bridge part 5d ... Reaction force claw 5f ... Strength formed at the tip of reaction force claw 5d Notch for member attachment 5g ... Female screw hole drilled in notch 5f 6 ... Friction pad 7 ... Cylinder hole 8 ... Piston 9 ... Hydraulic chamber 10 ... Strength member 10a ... Bolt drilled in strength member 10 Through hole 11 ... Lining 12 ... Back plate 15 ... Gap between reaction force claws 15d and 15d 16 ... Connecting bolt 17 ... Elastic material A ... Rotation direction of disk rotor 2 P1 ... Bolt through holes 10a, 10a of strength member 10
Pitch P2 ... Pitch of female screw holes 5g, 5g of reaction force claw 5d

Claims (2)

[Scope of utility model registration request] 1. A reaction part and a reaction part, which are arranged opposite to each other on both sides of a disk rotor, are connected by a bridge part straddling the outside of the disk rotor, and a plurality of reaction force claws in the disk radial direction are connected to the reaction part. In a caliper body of a vehicle disc brake having, a strength member is hung over the plurality of reaction claws to be bolted, and the pitch of the reaction force claw into which the connecting bolt is inserted and the bolt hole of the strength member are changed, A caliper body for a disc brake for a vehicle, wherein an initial stress in a disc circumferential direction is set in advance on a reaction force pawl. 2. An elastic material such as rubber is provided between the reaction force claws of the strength member so as to be flush with the side surface of the disk rotor of the reaction force claws.
The caliper body for a vehicle disc brake according to claim 1, wherein the elastic material is brought into contact with a back plate of the friction pad on the reaction portion side.