JP6502127B2 - Disc brake for vehicle - Google Patents

Description

  The present invention relates to a disc brake for a vehicle mounted on a traveling vehicle, and more specifically, a caliper bracket fixed to a vehicle body supports the caliper body slidably in the disc axial direction via a pair of slide pins. The present invention relates to a pin slide type disc brake for a vehicle in which a pair of friction pads are disposed movably in the disc axial direction with the disc rotor interposed therebetween.

  Heretofore, in the pin slide type vehicle disc brake, at the time of release of braking, a pair of friction pads are forcibly pulled back from the side surface of the disc rotor using a pad return spring to prevent the friction pads from dragging and prevent generation of judder. There has been one (see, for example, Patent Document 1). Further, a through hole is formed in the friction pad on the reaction part side to forcibly pull back the friction pad on the reaction part side from the side surface of the disk rotor at the time of releasing the brake, and the stepped part and the bracket formed in the through hole. There was one in which a pad return spring was mounted between them (see, for example, Patent Document 2).

Utility model registration 2552633 gazette JP-A-9-264350

  In pin-slide type disc brakes for vehicles, a bending moment is generated in the caliper body due to the braking torque generated by the sliding contact between the friction pad and the disc rotor at the time of braking, and the friction is generated with the piston inclined to the side of the disc rotor. The pad may be pushed, and even if the braking is released and the caliper body returns to the initial position, the friction pad is inclined to the disc rotor, and the disc rotor and the disc rotation entry side of the friction pad The gap formed between the two may be narrower than the gap formed between the disk rotor and the disk rotation side of the friction pad. In addition, after the disk rotor is thermally deformed by frictional heat by repeating the braking, when the braking is released and the disk rotor is cooled and returned to the original shape, the distance between the disk rotor and the friction pad becomes even more uneven. was there. As described above, when the vehicle travels with the friction pad inclined with respect to the side surface of the disc rotor and the disc rotor rotates, negative pressure is generated at a place where the gap between the disc rotor and the friction pad is narrow, and the friction pad There is a risk of sticking to the disc rotor.

  In the above-mentioned Patent Documents 1 and 2, the friction pad is forcibly pulled back from the side surface of the disc rotor by the pad return spring at the time of releasing the brake, but in the pad return spring, the braking torque, thermal deformation of the disc rotor, etc. As a result, it can not be corrected that the gap formed between the friction pad and the disc rotor will be uneven when braking is released. Therefore, the friction pad can not be corrected by the negative pressure generated between the disc rotor and the friction pad. It stuck to a disk rotor, and it was not able to control that a drag of a friction pad and a judder occur.

  Therefore, the present invention provides a disk brake for a vehicle capable of preventing the generation of a negative pressure between the disk rotor and the friction pad during traveling of the vehicle and suppressing the generation of the drag and the judder of the friction pad. It is an object.

In order to achieve the above object, the vehicle disc brake of the present invention is disposed on one side of the disc rotor, and is disposed on the other side of the disc rotor, the action part having a cylinder hole for receiving the piston, A caliper bracket is formed by connecting a reaction portion with a reaction force claw at a bridge portion to form a caliper body, and the caliper body is fixed to a caliper bracket fixed to a vehicle body at one side of the disc rotor. It is slidably supported in the disc axial direction via a pair of slide pins arranged on the disc rotating side and the disc rotating in side at the same time, and linings on the action part side and the reaction part side sandwiching the disc rotor In the disc brake for a vehicle in which each of the friction pads provided with the rear plate and the rear plate is disposed, the friction pad on the side of the action portion is the above-mentioned when the vehicle travels. Forming a negative pressure relief is part for releasing the negative pressure generated between Isukurota, the negative pressure relief is part, the disk rotation entrance side when the vehicle forward of said friction pad of the acting portion side, of the lining disc It is characterized in that a part of the rotor side is formed by cutting away from the side of the disk rotation side .

Further, the disc brake for a vehicle according to the present invention is disposed on one side of the disc rotor, and has an action portion provided with a cylinder hole for accommodating a piston, and the other side of the disc rotor, provided with a reaction force claw. The caliper body is connected to the reaction part at the bridge portion to form a caliper body, and the caliper body is fixed to the car body at one side of the disc rotor, and the disc is rotated at the time of advancing the caliper body. It is slidably supported in the disc axial direction via a pair of slide pins arranged on the side and the disc rotation side, and a lining and a back plate are provided on the action part side and the reaction part side across the disc rotor. In the disk brake for a vehicle in which each provided friction pad is disposed, the friction pad on the side of the action portion is configured to be connected to the disk rotor when the vehicle is traveling. Forming a negative pressure relief portion for releasing negative pressure generated in the housing, and the negative pressure relief portion is the lining of the lining of the friction pad on the side of the disk rotation of the friction pad on the action part side during vehicle advancement. It is characterized in that it is formed by cutting from the side of the disk rotation side from the rotor side surface to the anti-disk rotor side surface .

  According to the disc brake for a vehicle of the present invention, the friction pad on the side of the action part pressed by the piston is provided with a negative pressure relief part for releasing the negative pressure generated between the disc rotor and the vehicle when traveling. As a result, it is possible to prevent the friction pad from sticking to the disk rotor while the vehicle is traveling, and to suppress the occurrence of dragging of the friction pad and the occurrence of judder.

  In addition, the negative pressure relief portion is formed on the disk rotation side during forward movement of the friction pad on the action side, so that it is most likely to generate negative pressure between the disc rotor and the friction pad during forward movement of the vehicle. The negative pressure relief portion can be effectively formed. Furthermore, the negative pressure relief portion is also formed on the disc rotation side during forward movement of the friction pad on the action side, so that the negative pressure generated between the disc rotor and the friction pad can be released even during backward movement of the vehicle. be able to.

  Also, by forming the negative pressure relief portion with a through hole that passes through the disk rotor side surface of the friction pad and the anti-disk rotor side surface, the disk rotor side of the friction pad can communicate with the atmosphere side, making it easy to release negative pressure. . Furthermore, the negative pressure relief portion is formed by cutting away a portion of the disk rotor side of the lining, or by cutting away from the disk rotor side surface of the lining to the anti-disk rotor side surface, so that the disk has a simple structure. The negative pressure generated between the rotor and the friction pad can be well released.

FIG. 1 is a cross-sectional plan view of a disc brake for a vehicle according to a first embodiment of the present invention. It is II-II sectional drawing of FIG. It is a section top view of the disk brake for vehicles which shows the example of the 2nd form of the present invention. It is a section top view of the disk brake for vehicles which shows the example of the 3rd form of the present invention.

  FIG. 1 and FIG. 2 are views showing one embodiment of the disc brake for a vehicle according to the present invention, and the arrow A represents the rotational direction of the disc rotor which rotates integrally with the wheels when the vehicle advances. The side and the disc rotation side shall be at the time of forward movement of the vehicle.

  In the disk brake 1 for a vehicle according to the present embodiment, a caliper bracket 3 fixed to the vehicle body at one side of the disk rotor 2 is provided with a pair of caliper support arms 3a and 3a extending in the disk axial direction on the outer periphery of the disk rotor 2. The caliper body 5 is movably supported in the axial direction of the disc via the pair of slide pins 4 and 4 on both caliper support arms 3a and 3a, and each slide pin 4 is of the caliper body 5 Mounting arms 5b, 5b protruding to both sides of the action portion 5a are respectively provided with mounting bolts 6 and each caliper support arm 3a has a bag-like guide hole 3b for slidably accommodating the slide pin 4 Are formed respectively.

  The caliper bracket 3 is screwed and fixed to the vehicle body (neither is shown) with fixing bolts inserted into the vehicle body mounting portions 3c, 3c at one side of the disk rotor 2. The pair of caliper support arms 3a and 3a protruding in the direction of the action portion 5a are extended while sandwiching the disc turning in and turning out sides of the bridge portion 5c of the caliper body 5 across the outside of the disc rotor 2 ing. Further, on the opposing surfaces of the caliper support arms 3a, 3a, torque receiving portions 3d, 3d for receiving a braking torque are formed, and the non-attachment sides of the caliper support arms 3a, 3a are connected by tie rods 3e. There is.

  The caliper body 5 is formed of an action portion 5a and a reaction portion 5d disposed opposite to each other on both sides of the disc rotor 2 and a bridge portion 5c which straddles the outer periphery of the disc rotor 2 between the caliper support arms 3a and 3a. It has become. The action portion 5a is provided with the above-mentioned mounting arms 5b, 5b, a cylinder hole 5e in which the piston 7 is accommodated via the piston seal 8, and a hydraulic pressure chamber 9 defined at the bottom of the cylinder hole 5e. In addition, reaction claws 5f and 5f are provided in the reaction portion 5d.

  Between the piston 7 and the reaction force claw 5f, the friction pad 10 on the action part side and the friction pad 11 on the reaction part side are disposed opposite to each other with the disc rotor 2 interposed therebetween. The slide pins 4, 4 attached to the caliper body 5 are respectively inserted into the guide holes 3b of the caliper bracket 3, and between the vicinity of the opening of each of the guide holes 3b, 3b and the outer periphery of the shaft portion of the slide pins 4, 4. The bellows-like dust boots 12, 12 are respectively attached.

  The friction pads 10, 11 include linings 10a, 11a in sliding contact with the side surfaces of the disk rotor 2, and metal back plates 10b, 11b formed on the caliper support arms 3a, 3a. A pair of ear pieces 10c and 11c are provided protrudingly on both sides of the back plates 10b and 11b, respectively, and the friction pads 10 and 11 have the ear pieces 10c, 10c, 11c and 11c as the caliper support arms 3a and 3a. The torque receiving steps 3d, 3d are engaged with each other, and the torque receiving steps 3d, 3d are arranged slidably in the disk axial direction. In the lining 10a of the friction pad 10 on the action part side, the disc radial direction central part on the disc rotation entry side is cut out in a cubic shape from the side surface of the disc rotor to the side face of the disc rotor, and the negative pressure relief portion 10d Is formed.

  In the disc brake 1 for a vehicle according to this embodiment, when the fluid pressure generated by the well-known fluid pressure master cylinder (not shown) is supplied to the fluid pressure chamber 9, the piston 7 forms a disc in the cylinder hole 5e. By advancing in the direction of the rotor, the friction pad 10 on the action part side is pressed to one side of the disc rotor 2. Next, due to this reaction, the caliper body 5 is moved toward the action portion 5a while being guided by the slide pins 4 and 4, and the reaction force claw 5f of the reaction portion 5d moves the friction pad 11 on the reaction portion side to the disc. The other side of the rotor 2 is pressed to perform a braking action.

  The friction pads 10 and 11 during braking are dragged in the disc rotation direction by the sliding contact between the disc rotor 2 and the linings 10a and 11a, and the side faces of the back plates 10b and 11b on the disc rotation side are torque receiving stages. It abuts on the parts 3d, 3d. At this time, due to the braking torque generated, a bending moment is generated in the caliper body 5 so that the disc rotation side moves toward the reaction portion and the disk rotation side moves toward the operation portion, and the friction pad 10 on the operation portion side The disk rotation inward side is more strongly pressed to the disk rotor 2 than the disk rotation side.

  When the braking is released, the piston 7 retracts toward the bottom of the cylinder hole by the restoring force of the piston seal 8, thereby releasing the bending moment generated in the caliper body 5 and the caliper body 5 being in the initial position. The friction pad 10 on the action part side is pressed between the disk rotor 2 and the disk rotation inlet side of the lining 10 a because the disk rotation inlet side is more strongly pressed by the disk rotor 2 than the disk rotation side. The clearance formed in the space may be narrower than the clearance formed between the disc rotor 2 and the disc rotation side of the lining 10 a, and the friction pad 10 is held in an inclined state with respect to the disc rotor 2. There was Furthermore, after the disk rotor 2 is thermally deformed by frictional heat by repeating the braking, the braking is released and the disk rotor 2 is cooled and returned to the original shape, the distance between the disk rotor 2 and the friction pad 10 is uneven. It could have been

  When the vehicle travels and the disk rotor 2 rotates in such a state, a negative pressure is generated in the gap on the disk rotation side where the gap between the disk rotor 2 and the lining 10 a of the friction pad 10 is narrow. Although there is a possibility that 10a may stick to the disk rotor 2, in the present embodiment, a negative pressure relief portion formed by a notch at the central portion in the disk radial direction of the disk rotation side of the lining 10a of the friction pad 10 on the action portion side. The formation of negative pressure can be prevented since 10 d is formed, and there is no possibility that the lining 10 a will stick to the disk rotor 2, so that the generation of drag and judder of the friction pad 10 can be suppressed.

  3 and 4 are cross-sectional plan views of a disc brake for a vehicle according to another embodiment of the present invention, in which the same components as those in the first embodiment are designated by the same reference numerals. Detailed description is omitted.

  FIG. 3 shows a second embodiment of the present invention, wherein the lining 13a of the friction pad 13 on the working portion side of this embodiment is cubical from the disk rotor side surface in the disk radial direction central portion on the disk rotation side. The negative pressure relief portion 13 b is formed by cutting a part of the negative pressure relief portion 13 b.

  FIG. 4 shows a third embodiment of the present invention, in which the lining 14a and the back plate 14b of the friction pad 14 of the working portion of this embodiment are provided with a disk radial direction central portion on the disk rotation side and a disk Negative pressure relief portions 14c and 14c formed of two through holes penetrating the side surfaces of the disc rotor and the side face of the disc rotor are formed at the central portion in the radial direction of the disc at the side of the disc. In this embodiment, the negative pressure relief portion 14c is also formed on the disc rotation side, so that the negative pressure between the disc rotor 2 and the friction pad 14 can be released even when the vehicle is moving backward. Further, since the negative pressure relief portions 14c, 14c are formed by the through holes, the disc rotor side of the friction pad 10 can be communicated with the atmosphere side, and the negative pressure can be easily released.

  The present invention is not limited to the above-described embodiments, and the disk rotation side and the disk rotation side of the lining are cut away to form a negative pressure relief portion, or the disk rotation side of the friction pad. Alternatively, the negative pressure relief portion may be formed by a through hole, and the shape and location of the negative pressure relief portion are arbitrary. Furthermore, the position and shape of the lugs of the friction pad and the torque receiving portion of the caliper bracket are optional, and the invention can be applied to a type in which the friction pad is suspended by a hanger pin. Furthermore, the shape of the caliper body is not limited to the present embodiment, and the number of pistons and reaction force claws is arbitrary.

DESCRIPTION OF SYMBOLS 1 Disc brake for vehicles 2 Disc rotor 3 Caliper bracket 3a Caliper support arm 3b Guide hole 3c Body mounting portion 3d Torque receiving step 3e Tie rod 4 Slide pin DESCRIPTION OF SYMBOLS 5 ... Caliper body, 5a ... Action part, 5b ... Mounting arm, 5c ... Bridge part, 5d ... Reaction part, 5e ... Cylinder hole, 5f ... Reaction nail, 6 ... Mounting bolt, 7 ... Piston, 8 ... Piston seal, 9: Fluid pressure chamber, 10, 11: friction pad, 10a, 11a: lining, 10b, 11b: back plate, 10c, 11c: ear piece, 10d: negative pressure relief portion, 12: dust boot, 13: friction pad, 13a ... lining, 13b ... negative pressure relief section, 14 ... friction pad, 14a ... lining, 14b ... back plate, 14c ... negative pressure relief section

Claims (2)

The bridge portion connects the action portion provided on one side of the disc rotor and provided with a cylinder hole for accommodating the piston, and the reaction portion provided on the other side of the disc rotor and provided with a reaction force claw. A pair of caliper bodies, which are formed on a disc rotating side and a disc rotating inward side of the caliper body at the time of advancing the vehicle, on a caliper bracket which forms the caliper body and fixes the caliper body to one side of the disc rotor. A vehicle disc having a friction pad provided with a lining and a back plate on the action side and the reaction side with the disc rotor being slidably supported in the disc axial direction via the slide pin of At the brake
The friction pad on the side of the action portion forms a negative pressure relief portion for releasing the negative pressure generated with the disc rotor when the vehicle is traveling ,
The negative pressure relief portion is formed by cutting away a part of the lining on the disc rotor side from the side of the disc rotation side on the disc rotation side during forward movement of the friction pad on the working portion side. and the vehicle disc brake, characterized in that are. The bridge portion connects the action portion provided on one side of the disc rotor and provided with a cylinder hole for accommodating the piston, and the reaction portion provided on the other side of the disc rotor and provided with a reaction force claw. A pair of caliper bodies, which are formed on a disc rotating side and a disc rotating inward side of the caliper body at the time of advancing the vehicle, on a caliper bracket which forms the caliper body and fixes the caliper body to one side of the disc rotor. A vehicle disc having a friction pad provided with a lining and a back plate on the action side and the reaction side with the disc rotor being slidably supported in the disc axial direction via the slide pin of At the brake
The friction pad on the side of the action portion forms a negative pressure relief portion for releasing the negative pressure generated with the disc rotor when the vehicle is traveling ,
The negative pressure relief portion is located on the disk rotation side of the lining on the disk rotation side of the friction pad on the working portion side, when the friction pad is on the disk rotation side. A disk brake for a vehicle characterized by being cut out of a side portion .

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