JP3630656B2 - Vehicle disc brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc brake for a vehicle using a pin slide type or piston facing type caliper body, and more specifically, the friction pad is lifted or rattled between the bridge portion of the caliper body and the friction pad. The present invention relates to a pad spring mounting structure used for preventing the above.
[0002]
[Prior art]
An example of a vehicle disc brake in which a pad spring is mounted between a bridge portion of a caliper body and a friction pad is disclosed in JP-A-7-158668.
In this disk brake, a caliper body is formed by an action part and a reaction part (actuating body of the present invention) disposed opposite to both sides of the disk rotor, and a bridge part that connects these parts across the outer periphery of the disk rotor, A pair of friction pads is disposed between the action part and the reaction part with the disk rotor interposed therebetween.
[0003]
The pad spring includes a plurality of attachment pieces and a plurality of spring portions extending obliquely from the attachment pieces. The pad spring is engaged with a vent hole that opens in the bridge portion, and the pad spring is connected to the bridge portion. The spring part is arranged in the shape of a letter C from the inside of the vent hole to the disk inlet side and outlet side, and the tip of the spring part is placed on the outer surface of the friction pad back plate. In addition to abutting, the middle part of the spring part is elastically contacted with the inner surface of the bridge part, and the spring force generated in the spring part is applied to the friction pad so that the friction pad is prevented from lifting and rattling. Yes.
[0004]
[Problems to be solved by the invention]
However, since the above-described pad spring elastically contacts the inner surface of the bridge portion with the inner surface of the bridge portion to generate a spring force, the portion where the spring force acts is limited to a short span from the tip to the intermediate portion. Therefore, there is a problem that it is difficult to set a spring force suitable for the friction pad.
[0005]
Therefore, the present invention can easily secure a spring force suitable for the friction pad in the spring portion of the pad spring, reliably preventing the friction pad from lifting and rattling, and further reducing the size of the caliper body. The object is to provide a disc brake for a vehicle.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, a caliper body is supported by a caliper bracket fixed to a vehicle body at one side of a disc rotor, and the caliper body is opposed to both sides of the disc rotor. A pair of operating bodies to be disposed and a bridge portion that connects the operating bodies across the outer periphery of the disk rotor, and a pair of friction pads are disposed between the operating bodies with the disk rotor interposed therebetween, In a vehicle disc brake having a pad spring interposed between a pad and the bridge portion, a plurality of concave grooves are formed on an inner peripheral surface of the bridge portion, and a portion sandwiched between the concave grooves is defined as a spring mounting portion. No, the pad spring has a pair of mounting pieces facing a connecting piece connecting the one end of the attachment piece, four extending shaped wafer radially inward from opposite sides of the connecting piece And a spring portion, formed by bending a single metal plate, as well as engaged with the mounting piece on the side surface of the spring mounting portion, is brought into contact with the connecting piece to the inner surface of the spring mounting portion, The front end side of the spring portion is elastically contacted with the outer surface of the friction pad, and the spring force of the spring portion is applied to the friction pad in the disc inward direction.
[0007]
Further, a second aspect of the present invention is that a caliper body is supported by a caliper bracket fixed to the vehicle body at one side portion of the disc rotor, and a pair of operating bodies disposed on both sides of the disc rotor on the caliper body. And a bridge portion that connects the operating body across the outer periphery of the disk rotor, a pair of friction pads are disposed between the operating body with the disk rotor interposed therebetween, and the friction pad and the bridge portion In a vehicle disc brake having a pad spring interposed therebetween, a spring mounting portion protrudes inward from the inner peripheral surface of the bridge portion, and the pad spring includes a pair of opposing mounting pieces, A metal plate is bent by connecting a connecting piece that connects one end of the piece, and four spring parts extending in the shape of a C from both sides of the connecting piece to the inside in the radial direction. Form, resilient contact the attachment piece as well as engaged with the side surface of the spring mounting portion, the connecting piece is brought into contact with the inner surface of the spring mounting portion, the distal end side of the spring portion to the outer surface of the friction pad Thus, the spring force of the spring portion is applied to the friction pad in the disc inward direction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a front wheel of a motorcycle will be described with reference to the drawings.
A disc brake 1 is pivotally supported by an axle 3 together with a front wheel (not shown) on a bottom case 2 of a front fork, and a disc rotor 4 that rotates integrally with the front wheel in the direction of arrow A when the vehicle travels, and one side portion of the disc rotor 4 A pin slide type caliper body 7 supported by a pair of caliper brackets 2a and 2b integrally provided in the bottom case 2 through a slide pin 5 and 6 so as to be slidable in the disk axial direction, Between the action part 7a and the reaction part 7b of the caliper body 7, a pair of friction pads 8 and 9 are provided so as to face each other with the disk rotor 4 interposed therebetween.
[0009]
The caliper body 7 includes the above-described action portions 7 a and reaction portions 7 b disposed on both sides of the disk rotor 4, and a bridge portion 7 c that connects the action portions 7 a and the reaction portions 7 b across the outer periphery of the disk rotor 4. It is made up of. The action part 7a and the reaction part 7b are operating bodies in the present invention. The action part 7a is provided with bottomed cylinder holes 10 and 10 opened on the disk rotor side in the circumferential direction of the disk. The reaction force claw 7d is integrally formed.
[0010]
A piston 11 is inserted into the cylinder holes 10 and 10 in a fluid-tight and movable manner, and a hydraulic chamber 12 is defined between the piston 11 and the bottom of the cylinder hole 10. Guide arms 7e, 7e of the hanger pin 13 project from the disk entry side of the action part 7a and the reaction part 7b, and slide pins 5, 7e are provided on the disk delivery side and the disk inner circumference side of the action part 7a. Six attachment arms 7f and 7g are extended. At the center of the inner peripheral surface 7h of the bridge portion 7c, two concave grooves 7i and 7i are formed in parallel with the disk shaft, and a portion sandwiched between the two concave grooves 7i and 7i is used as a spring mounting portion 7j. A pad spring 14 is engaged with the spring mounting portion 7j.
[0011]
The caliper brackets 2a and 2b are plate-like bodies formed integrally with the bottom case 2, and one caliper bracket 2a is located on the disk outlet side and the disk outer peripheral side of the caliper body 7, and the other caliper bracket 2b is provided. The caliper body 7 is disposed on the inner circumference side of the disc, and the slide pins 5 and 6 project from the caliper brackets 2a and 2b on the working portion side in parallel with the disc axis. The sliding pin 5 on the disk delivery side is inserted into the insertion hole 7k of the mounting arm 7f projecting from the caliper body 7 to the disk delivery side, and the sliding pin 6 on the inner circumference side of the disk is connected from the caliper body 7 to the inner circumference of the disk. The caliper body 7 is supported by the slide pins 5 and 6 so as to be movable in the disk axial direction.
[0012]
The sliding pin 5 on the disk delivery side includes a shaft portion 5a inserted into the insertion hole 7k of the attachment arm 7f, a male screw 5b used for attachment to the caliper bracket 2a, and a flange 5c provided between them. It is made up of. In the caliper bracket 2a, the male screw 5b is inserted into the through hole 2c from the working portion side of the caliper bracket 2a, the flange 5c is brought into contact with the side surface of the working portion of the caliper bracket 2a, and protrudes from the through hole 2c to the reaction portion side. The sleeve nut 15 is screwed onto the male screw 5b, and the caliper bracket 2a is sandwiched between the flange 15a of the sleeve nut 15 and the flange 5c of the sliding pin 5, so that the sliding pin 5 acts on the caliper bracket 2a. Projecting on the side parallel to the disc axis.
[0013]
The sleeve nut 15 is a bottomed cylindrical cap nut, the flange 15a is formed on the opening side, the turning hexagonal hole 15b is formed through the bottom wall, the male screw 5b of the sliding pin 5 and the above-described screw. When screwed in such a manner, it is arranged so as to protrude from the caliper bracket 2a to the reaction portion side in parallel with the slide pin 5 in parallel with the disk shaft.
[0014]
The sliding pin 6 on the inner circumference side of the disk includes a shaft portion 6a inserted into the insertion hole 7m of the mounting arm 7g, a male screw 6b used for attachment to the caliper bracket 2b, and a space between the male screw 6b and the shaft portion 6a. And a hexagonal nut 6c. In the caliper bracket 2b, the sliding pin 6 is brought into contact with the caliper bracket by screwing the male screw 6b into the female screw hole 2e of the caliper bracket 2b from the acting portion side and bringing the nut 6c into contact with the acting portion side surface of the caliper bracket 2b. It protrudes in parallel with the disk axis on the acting part side of 2b.
[0015]
On the guide arms 7e and 7e located on the disk entry side of the action part 7a and the reaction part 7b of the caliper body 7, a hanger pin 13 is laid across the outside of the disk rotor 4 in parallel with the disk axis. 13 suspends the disk feed-in side of the friction pads 8 and 9, and the disk feed-out side of the friction pads 8 and 9 is supported by the torque receiving step 2 d of the caliper bracket 2 a and the sleeve nut 15.
[0016]
The friction pads 8 and 9 are configured by fixing linings 8a and 9a that are in sliding contact with the side surface of the disk rotor 4 to one side surface of the back plates 8b and 9b. The arm portions 8d and 9d provided with the hanger pin insertion holes 8c and 9c are protruded. Torque transmission arms 8e and 9e are provided on the disk delivery side of the back plates 8b and 9b, and a semicircular arc forked piece 9f is provided at the tip of the torque transmission arm 9e on the reaction portion side. Protruding pieces 8g, 8g, 9g, and 9g are provided on the outer surface disk entrance side and the exit side of the plates 8b and 9b.
[0017]
The friction pad 8 on the working part side is suspended by inserting the hanger pin 13 through the hanger pin insertion hole 8c on the disk introduction side, and the torque transmission arm 8e on the disk delivery side is connected to the torque receiving step part of the caliper bracket 2a. It is supported by 2d and is disposed between the piston 11 and one side surface of the disk rotor 4 so as to be movable in the disk axial direction.
[0018]
Further, the friction pad 9 on the reaction part side is suspended by the hanger pin 13 being similarly inserted into the hanger pin insertion hole 9c on the disk insertion side, and the sleeve is formed by a bifurcated piece 9f at the tip of the torque transmission arm 9e on the disk supply side. A substantially half circumference of the nut 15 is held and disposed between the reaction force claw 7d and the other side surface of the disk rotor 4 so as to be movable in the disk axial direction.
[0019]
The pad spring 14 includes a pair of mounting pieces 14a, 14a facing each other, a connecting piece 14b connecting between the ends of the mounting pieces 14a, 14a, and four pieces extending in a C shape from both sides of the connecting piece 14b. The spring portion 14c is formed by bending a single metal plate. The pad spring 14 inserts the mounting pieces 14a, 14a into the concave grooves 7i, 7i, sandwiches both side surfaces 7n, 7n of the spring mounting portion 7j, and contacts the connecting piece 14b to the inner side surface 7o of the spring mounting portion 7j. The spring is attached to the inside of the bridge portion 7c by holding the spring mounting portion 7j with the attachment pieces 14a, 14a and the connection piece 14b, and the letter C is formed from the connection piece 14b to the disk insertion side and the extraction side. The tip end side of the spring portion 14c extending in a shape is brought into pressure contact with the protruding pieces 8g, 8g, 9g, 9g of the back plates 8b, 9b of the friction pads 8,9.
[0020]
The distance between the spring mounting portion 7j and the projecting pieces 8g, 8g, 9g, 9g of the friction pads 8, 9 is set to be narrower than the free length in the disk radial direction of the spring portion 14c disposed here. The part 14c abuts the connecting piece 14b of the pad spring 14 serving as the attachment base against the inner side surface 7o of the spring mounting part 7j, and further, the front end side of the part 14c protrudes from the back plates 8b, 9b of the friction pads 8, 9 A spring force is generated by pressure contact with the pieces 8g, 8g, 9g, and 9g. The spring force generated in each friction pad 14c in this way acts on the friction pads 8 and 9 through the projecting pieces 8g, 8g, 9g and 9g of the back plates 8b and 9b. Energize.
[0021]
The disc brake 1 according to the present embodiment is configured as described above. When the hydraulic fluid is supplied to the hydraulic pressure chambers 12 and 12 of the caliper body 7 by the driver's braking operation, each of the pistons 11 is provided. Moves the cylinder hole 10 toward the disk rotor 4, pushes the friction pad 8 on the action portion side, and slides the lining 8 a against one side surface of the disk rotor 4. Next, due to this reaction force, the caliper body 7 moves in the direction of the action part while being guided by the slide pins 5 and 6, the reaction force claw 7d pushes the friction pad 9 on the reaction part side, and the lining 9a is moved to the disc. A braking action is performed in sliding contact with the other side of the rotor 4.
[0022]
Since the friction pads 8 and 9 are held by a pad spring 14 interposed between the friction pad 8 and the bridge portion 7c, rattling during vehicle traveling and lifting during braking are suppressed as much as possible. In addition, the spring portion 14c has a long span extending from the proximal end on the connecting piece 14b side to the vicinity of the distal end portion without hitting the intermediate portion against the inner peripheral wall of the bridge portion as in the prior art. Therefore, a suitable spring force can be applied to the friction pads 8 and 9.
[0023]
Furthermore, the inner peripheral surface 7h of the bridge portion 7c only needs to be formed with a small number of concave grooves 7i, 7i for forming the spring mounting portion 7j, so that the caliper body 7 does not expand in the disk outward direction. The pad spring 14 can be attached to the bridge portion 7c while securing a required rigidity force to the bridge portion 7c.
[0024]
As another configuration of the present invention, the spring mounting portion may protrude from the inner peripheral surface of the bridge portion toward the friction pad. In this case, since the concave groove is not formed on the inner peripheral surface of the bridge portion, the bridge portion can have a greater rigidity.
Further, the caliper body may be a piston-facing type in which pistons are disposed opposite to a pair of opposing working portions, in addition to the pin slide type of the embodiment. Furthermore, the present invention can be widely applied as a front-wheel or rear-wheel disc brake for various bar-handle vehicles and automobiles, in addition to the front-wheel brake for motorcycles shown in the embodiments.
[0025]
【The invention's effect】
As described above, according to the vehicle disc brake of the present invention, the intermediate portion of the spring portion of the pad spring is not applied to the inner peripheral wall of the bridge portion as in the prior art, and the long span over the substantially entire length of the spring portion is achieved. Since the spring force is given, it is possible to easily set a fine spring force in the spring part, and by applying a suitable spring force to the friction pad according to the various conditions of the friction pad, Lifting can be surely prevented.
[0026]
In addition, if the spring mounting portion is formed in the bridge portion using a plurality of concave grooves, the pad spring can be mounted on the bridge portion while ensuring the required rigidity in the bridge portion without increasing the size of the caliper body. . Furthermore, when the spring mounting portion is provided so as to protrude from the inner peripheral surface of the bridge portion toward the inside of the disk, a large rigidity can be ensured by the bridge portion.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line II in FIG. 2. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3. FIG. 3 is a front view of a disc brake showing an embodiment of the present invention. FIG. 5 is a plan view of a disc brake according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2a, 2b ... Caliper bracket, 4 ... Disc rotor, 7 ... Caliper body, 7a ... Action part (acting body of this invention), 7b ... Reaction part (acting body of this invention), 7c ... Bridge part , 7h ... inner peripheral surface of the bridge portion 7c, 7i ... concave groove, 7j ... spring mounting portion, 7n ... side surface of the spring mounting portion 7j, 7o ... inner side surface of the spring mounting portion 7j, 8, 9 ... friction pads, 8a, 9a ... Lining, 8b, 9b ... Back plate, 8g, 9g ... Projection piece of back plate 8b, 9b, 14 ... Pad spring, 14a ... Mounting piece, 14b ... Connection piece, 14c ... Spring part,

Claims (2)

The caliper body is supported by a caliper bracket fixed to the vehicle body at one side of the disc rotor, and a pair of operating bodies disposed opposite to both sides of the disc rotor and the outer circumference of the disc rotor are straddled on the caliper body. And a bridge portion for connecting the operating body, a pair of friction pads are disposed between the operating bodies with the disk rotor interposed therebetween, and a pad spring is interposed between the friction pad and the bridge portion. In the vehicle disc brake, a plurality of concave grooves are formed on the inner peripheral surface of the bridge portion, a portion sandwiched between the concave grooves is a spring mounting portion, and the pad spring includes a pair of opposing mounting pieces, A metal plate is bent by connecting a connecting piece that connects between one end of the mounting piece and four spring parts extending radially inward from both sides of the connecting piece. Form, resilient contact the attachment piece as well as engaged with the side surface of the spring mounting portion, the connecting piece is brought into contact with the inner surface of the spring mounting portion, the distal end side of the spring portion to the outer surface of the friction pad A disc brake for a vehicle, characterized in that a spring force of a spring portion is applied to the friction pad in an inward direction of the disc. The caliper body is supported by a caliper bracket fixed to the vehicle body at one side of the disc rotor, and a pair of operating bodies disposed opposite to both sides of the disc rotor and the outer circumference of the disc rotor are straddled on the caliper body. And a bridge portion for connecting the operating body, a pair of friction pads are disposed between the operating bodies with the disk rotor interposed therebetween, and a pad spring is interposed between the friction pad and the bridge portion. In a vehicle disc brake, a spring mounting portion protrudes inward from the inner peripheral surface of the bridge portion, and the pad spring is connected to a pair of opposing mounting pieces and one end portion of the mounting pieces. pieces and, the four spring portions extending radially inwardly form of a slanted roof from both sides of the connecting piece, formed by bending a single metal plate, said mounting piece While engaging with the side surface of the spring mounting portion, the connecting piece is brought into contact with the inner side surface of the spring mounting portion, and the tip end side of the spring portion is elastically contacted with the outer surface of the friction pad. A disc brake for a vehicle, wherein a spring force of a spring portion is applied inward in the disc.

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