JP6928564B2 - Vehicle disc brakes - Google Patents

Description

The present invention relates to a vehicle disc brake, and more particularly to a vehicle disc brake provided with a pad spring for preventing the friction pad from rattling.

Conventionally, the caliper body is attached to the caliper bracket fixed to the vehicle body so as to be movable in the direction of the disc axis via a slide pin, and a pair of friction pads are arranged with the disc rotor sandwiched between them. In a vehicle disc brake in which the pair of friction pads are suspended on hanger pins spanned in the disc axial direction between the parts, a pad spring is arranged between the bridge portion of the caliper body and the friction pads. Some of them suppress the rattling of the friction pad (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-190035

However, in the above-mentioned Patent Document 1, since it is necessary to secure a space for arranging the pad spring between the bridge portion of the caliper body and the friction pad, there is a risk that the caliper body becomes large. .. Further, if the bridge portion is made thin to secure a space for arranging the pad spring, the rigidity of the bridge portion may decrease.

Therefore, an object of the present invention is to provide a vehicle disc brake capable of attaching a pad spring to the caliper body without enlarging the caliper body while ensuring the rigidity of the bridge portion.

In order to achieve the above object, the vehicle disc brake of the present invention is arranged on one side of the disc rotor, and is arranged on an action unit having a cylinder hole for accommodating a piston and on the other side of the disc rotor. A caliper body is formed by connecting a reaction portion provided with a reaction force claw with a bridge portion, and the caliper body is fixed to the vehicle body on one side of the disc rotor in the disc axial direction via a slide pin. A pair of friction pads are arranged so as to be movable with respect to the disc rotor, and the pair of friction pads are hung on a hanger pin bridged between the action portion and the reaction portion in the disc axial direction. In a vehicle disc brake that is held and the caliper bracket is provided with a torque receiving surface that receives braking torque from the friction pad, the friction pad inserts the hanger pin into the disc turning side when the vehicle is moving forward. The caliper body has a hanging piece, and the caliper body is located outside the outer peripheral surface of the disc rotor of the action portion and the reaction portion, and the disc is closer to the disc entry side end surface of the bridge portion when the vehicle is moving forward. Hanger pin mounting boss portions for mounting the hanger pins are provided on the turning side, respectively, and the pair of friction pads are placed on the inner circumference of the disc by abutting the hanging piece on the disc turning side end face of the bridge portion. It is characterized in that pad springs that urge the side and the torque receiving surface side are attached.

Further, the pad spring is provided at a base portion of the bridge portion that abuts on the disc entry side end surface, a first spring piece that extends from the base portion to the disc entry side, and a tip of the first spring piece. It is preferable to include a second spring piece that abuts on the hanging piece and urges the pair of friction pads on the inner peripheral side of the disc and the torque receiving surface side.

Further, it is preferable that a locking portion of the pad spring is provided on the end surface of the bridge portion on the disk entry side, and the pad spring is provided with a locking piece to be locked to the locking portion. ..

Further, it is preferable that the locking portion is formed on the action portion side and the reaction portion side of the end surface on the disk entry side. Further, the locking portion may be formed at the central portion in the disc axial direction of the end face on the disc entry side.

According to the disc brake for a vehicle of the present invention, a pad spring is attached to the end surface of the bridge portion of the caliper body on the disc entry side when the vehicle is moving forward, so that a pad is provided between the bridge portion and the friction pad as in the conventional case. Since it is not necessary to secure a space for arranging the spring, the pad spring can be attached to the caliper body without increasing the size of the caliper body while ensuring the rigidity of the bridge portion.

Further, the pad springs are provided at the base portion of the bridge portion that abuts on the disc entry side end surface, the first spring piece that extends from the base portion while bending concavely from the base portion to the disc entry side, and the tip of the first spring piece. By providing a second spring piece that abuts on the hanging piece and urges a pair of friction pads on the inner peripheral side of the disc and the torque receiving surface side, the bullets of the first spring piece and the second spring piece are provided. By the force, the pair of friction pads are urged to the inner peripheral side of the disc and the torque receiving surface side, and the rattling of the friction pads can be satisfactorily suppressed.

Further, a locking portion of the pad spring is provided on the end surface of the bridge portion of the caliper body on the disc entry side, and the pad spring is provided with a locking piece to be locked to the locking portion. The pad spring can be easily attached without using a fastening means. Further, by forming the locking portion on the acting portion side and the reaction portion side of the end surface on the disc entry side, the locking portion can be formed with good hot water circulation when casting the caliper body. Further, the shape of the pad spring can be simplified by forming the locking portion at the central portion in the disc axial direction of the end face on the disc entry side.

It is a perspective view of the disc brake for a vehicle which shows the 1st Embodiment example of this invention. Similarly, it is a front view of a vehicle disc brake. Similarly, it is a partial cross-sectional plan view of a vehicle disc brake. It is also a side view of a vehicle disc brake. It is a VV cross-sectional view of FIG. FIG. 2 is a sectional view taken along line VI-VI of FIG. It is a perspective view of the pad spring which shows the 1st Embodiment example of this invention. It is a perspective view of the disc brake for a vehicle which shows the 2nd Embodiment example of this invention. Similarly, it is a partial cross-sectional plan view of a vehicle disc brake. It is also a side view of a vehicle disc brake. FIG. 9 is a cross-sectional view taken along the line XI-XI of FIG. It is a perspective view of the pad spring which shows the 2nd Embodiment example of this invention.

1 to 7 are views showing an example of the first embodiment of the vehicle disc brake of the present invention, and arrow A indicates the rotation direction of the disc rotor that rotates integrally with the wheel when the vehicle moves forward, and the disc rotation described below. The side and the disc turning side shall be when the vehicle is moving forward.

The vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown) when the vehicle is running, a caliper bracket 3 attached to a vehicle body on one side of the disc rotor 2, and a slide pin on the caliper bracket 3. The disc rotor 2 is sandwiched between the pin slide type caliper body 6 slidably supported in the disc axial direction via 4 and 5 and the acting portion 6a and the reaction portion 6b of the caliper body 6 so as to face each other. A pair of friction pads 7 and 7 and a pad spring 8 for preventing the friction pads 7 and 7 from rattling are provided.

The caliper bracket 3 includes an axle mounting portion 3b having a through hole 3a through which an axle passing through the center of the disc rotor 2 is inserted, and a turn-in side caliper support extending from the axle mounting portion 3b toward the outer periphery of the disc rotor 2. It has an arm 3c and a feeding side caliper supporting arm 3d extending to the turning side with respect to the turning side caliper supporting arm 3c. The accommodating recesses 3e of the friction pads 7 and 7 are provided between the transfer side caliper support arm 3c and the exit side caliper support arm 3d, and the side surface of the exit side caliper support arm 3d on the accommodating recess 3e side. A U-shaped pad guide groove 3f is provided, and a torque receiving surface 3g is provided on the disc feeding side of the pad guide groove 3f. Further, a caliper support arm 3h straddling the outer circumference of the disc rotor 2 is projected in the disc axial direction on the tip end side of the caliper support arm 3d on the rotation side, and a bag-shaped slide pin insertion hole 3i is provided in the caliper support arm 3h. A slide pin mounting portion 3j is formed at the tip of the turning-in side caliper support arm 3c.

The caliper body 6 is composed of the above-mentioned acting portions 6a and reaction portions 6b arranged on both side portions of the disc rotor 2 and bridge portions 6c connecting them across the outer circumference of the disc rotor 2. The working portion 6a is provided with a bottomed cylinder hole 6d having an opening on the disc rotor 2 side, and the reaction portion 6b is integrally formed with a reaction force claw 6e. A piston 9 is liquid-tightly inserted into the cylinder hole 6d, and a hydraulic chamber 10 is defined between the piston 9 and the bottom of the cylinder hole 6d. Slide pin mounting arms 6f and 6g for mounting slide pins 4 and 5 are projected from the working portion 6a toward the disc feeding side and the disc inner peripheral side, and the disc turning side of the working portion 6a and the reaction portion 6b. The hanger pin mounting boss portions 6h and 6i for mounting the hanger pin 11 are provided so as to project from the hanger pin mounting boss portions 6h and 6i. Further, on the disc rotor 2 side of the hanger pin mounting boss portions 6h and 6i, and on the disc outer peripheral side (the working portion side and the reaction portion side of the disc turning side end surface 6m), the locking portion 6j of the pad spring 8 6k is provided.

The caliper body 6 projects the slide pin 4 toward the disc rotor 2 on the slide pin mounting arm 6f on the disc feeding side, inserts the slide pin 4 into the slide pin insertion hole 3i of the caliper bracket 3, and inserts the slide pin 4 into the slide pin insertion hole 3i of the caliper bracket 3. A slide pin 5 is projected from the slide pin mounting portion 3j of the caliper bracket 3 toward the anti-disc rotor side, and the slide pin 5 is inserted into the slide pin mounting arm 6g on the inner peripheral side of the disc of the caliper body 6. It is supported so that it can be moved in the direction of the disc axis.

Each friction pad 7 is configured by joining a lining 7a that is in sliding contact with the side surface of the disc rotor 2 to a metal back plate 7b. On the back plate 7b, a hanging piece 7d provided with a hanger pin insertion hole 7c is projected on the disc insertion side, and an ear piece 7e supported by the pad guide groove 3f of the caliper bracket 3 protrudes on the disk exit side. Will be set up. Each friction pad 7 bridges the hanger pin 11 between the hanger pin mounting boss portions 6h and 6i of the hanger pin 11 formed on the caliper body 6 and the hanger pin insertion hole 7c formed in the hanging piece 7d, and the ear piece 7e. Is supported by the pad guide groove 3f of the caliper bracket 3 so that the caliper bracket 3 can be moved in the disc axial direction.

The pad spring 8 is a first spring piece that extends from the base portion 8a of the bridge portion 6c, which abuts on the disc entry side end surface 6m, and the central portion of the base portion 8a in the disk axial direction while being concavely curved toward the disc entry side. 8b, the second spring piece 8c extending in the disc axial direction from the tip of the first spring piece 8b and coming into contact with the hanging pieces 7d, 7d of the friction pads 7, 7 and both ends in the disc axial direction of the base 8a. It is provided with a pair of locking pieces 8d and 8d extending from the caliper body 6 and locked to the locking portions 6j and 6k formed on the caliper body 6. The pad spring 8 is attached to the caliper body 6 by bringing the base portion 8a into contact with the disc entry side end surface 6m of the bridge portion 6c and locking the locking pieces 8d and 8d to the locking portions 6j and 6k, respectively. By bringing the second spring piece 8c into contact with the hanging pieces 7d and 7d of the friction pads 7 and 7, the friction pads 7 and 7 are placed in the disc by the elastic force of the first spring piece 8b and the second spring piece 8c. It urges the peripheral side and the torque receiving surface 3g side.

In the vehicle disc brake 1 thus formed, when the hydraulic fluid boosted by a separate hydraulic master cylinder is supplied to the hydraulic chamber 10 during braking, the piston 9 moves to the disc rotor 2 side. The friction pad 7 on the working portion 6a side is urged to one side surface of the disc rotor 2. Next, due to this reaction, the caliper body 6 moves to the action portion 6a side while being guided by the slide pins 4 and 5, and the reaction force claw 6e of the reaction portion 6b moves the friction pad 7 on the reaction portion 6b side to the other side of the disc rotor 2. Braking action is performed by pressing against the side surface.

At this time, in the friction pads 7 and 7, the hanging pieces 7d and 7d are urged to the torque receiving surface 3g side by the first spring piece 8b and the second spring piece 8c of the pad spring 8, and the ear pieces 7e and 7e are torqued. Since it is in a state of being in contact with the receiving surface 3g in advance, there is no risk of rattling during braking, and the braking torque from the friction pads 7 and 7 can be satisfactorily received by the torque receiving surface 3g. Further, since the friction pads 7 and 7 are urged toward the inner peripheral side of the disk by the first spring piece 8b and the second spring piece 8c, it is possible to prevent the friction pads 7 and 7 from rattling due to running vibration or the like. ..

In this embodiment, as described above, the pad spring 8 is attached to the disc insertion side end surface 6m of the bridge portion 6c of the caliper body 6, so that the pad spring 8 is between the bridge portion 6c and the friction pad 7 as in the conventional case. Since it is not necessary to secure a space for arranging the pad spring 8, the pad spring 8 can be attached to the caliper body 6 without increasing the size of the caliper body 6 while ensuring the rigidity of the bridge portion 6c. Further, the caliper body 6 is provided with the locking portions 6j and 6k of the pad spring 8, and the pad spring 8 is provided with the locking pieces 8d and 8d locked to the locking portions 6j and 6k, respectively. The pad spring 8 can be easily attached without using a fastening means. Further, since the locking portions 6j and 6k of the pad spring 8 are provided on the disc rotor 2 side and the disc outer peripheral side of the hanger pin mounting boss portions 6h and 6i, they are locked when the caliper body 6 is cast. The portions 6j and 6k can be continuously formed in the action portion and the reaction portion, and can be formed with good circulation.

8 to 12 show a second embodiment of the present invention, and the same reference numerals are given to those showing the same components as those of the first embodiment, and detailed description thereof will be omitted. ..

The caliper body 6 of this embodiment is provided with a locking portion 6n at the central portion of the bridge portion 6c on the disc insertion side end surface 6 m in the disc axial direction. The pad spring 12 has a bifurcated base portion 12a, 12a that abuts on the disc entry side end surface 6m of the bridge portion 6c, and a first spring piece 12b that extends from the base portions 12a, 12a while bending concavely toward the disc entry side. , 12b, a locking piece 12c provided between the bifurcated first spring pieces 12b, 12b and locked to the locking portion 6n, and the tip portions of the first spring pieces 12b, 12b and the locking piece 12c. A second spring piece 12d that extends in the direction of the disc axis and comes into contact with the hanging pieces 7d and 7d of the friction pads 7 and 7 is provided. The pad spring 12 abuts the base portions 12a and 12a on the disc entry side end surface 6m of the bridge portion 6c with the locking portion 6n interposed therebetween, and locks the locking piece 12c to the locking portion 6n to lock the caliper body 6 The friction pads 7 and 7 are urged to the inner peripheral side of the disc and the torque receiving surface 3g side by the elastic force of the first spring pieces 12b and 12b and the second spring piece 12d.

In this embodiment, as described above, the pad spring 12 is a bifurcated first spring because the locking portion 6n is provided at the central portion of the bridge portion 6c on the disc entry side end surface 6 m in the disc axial direction. A locking piece 12c is provided between the pieces 12b and 12b, and the shape of the pad spring can be simplified.

The present invention is not limited to each of the above-described examples, and the caliper body may not be provided with a locking portion of the pad spring, and the pad spring may not be provided with a locking piece locked to the locking portion. Further, the shape of the friction pad, the caliper body, and the caliper bracket is arbitrary as long as the spring piece of the pad spring is in contact with the hanging piece of the friction pad.

1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Through hole, 3b ... Axle mounting part, 3c ... Turn-in side caliper support arm, 3d ... Turn-out side caliper support arm, 3e ... Storage recess , 3f ... Pad guide groove, 3g ... Torque receiving surface, 3h ... Caliper support arm, 3i ... Slide pin insertion hole, 3j ... Slide pin mounting part, 4, 5 ... Slide pin, 6 ... Caliper body, 6a ... Acting part, 6b ... Reaction part, 6c ... Bridge part, 6d ... Cylinder hole, 6e ... Reaction force claw, 6f, 6g ... Slide pin mounting arm, 6h, 6i ... Hanger pin mounting boss part, 6j, 6k ... Locking part, 6m ... Disc insertion side end face, 6n ... locking part, 7 ... friction pad, 7a ... lining, 7b ... back plate, 7c ... hanger pin insertion hole, 7d ... hanging piece, 7e ... ear piece, 8 ... pad spring, 8a ... base, 8b ... 1st spring piece, 8c ... 2nd spring piece, 8d ... locking piece, 9 ... piston, 10 ... hydraulic chamber, 11 ... hanger pin, 12 ... pad spring, 12a ... base, 12b ... first 1 spring piece, 12c ... locking piece, 12d ... second spring piece

Claims (6)

An action portion arranged on one side of the disc rotor and having a cylinder hole for accommodating a piston and a reaction portion arranged on the other side of the disc rotor and having a reaction force claw are connected by a bridge portion. A caliper body is formed, and the caliper body is provided on a caliper bracket fixed to the vehicle body on one side of the disc rotor so as to be movable in the disc axial direction via a slide pin, and a pair of frictions sandwiching the disc rotor. A pad is arranged, and the pair of friction pads are suspended by a hanger pin spanning the action portion and the reaction portion in the disc axial direction, and the braking torque from the friction pad is applied to the caliper bracket. In vehicle disc brakes provided with a torque receiving surface
The friction pad has a hanging piece through which the hanger pin is inserted on the disc entry side when the vehicle is moving forward, and the caliper body is outside the outer peripheral surface of the disc rotor of the action portion and the reaction portion. A hanger pin mounting boss portion for mounting the hanger pin is provided at the position and on the disc turning side of the bridge portion on the disc turning side end surface when the vehicle is moving forward.
A pad spring is attached to the end surface of the bridge portion on the disk entry side to abut the hanging piece and urge the pair of friction pads to the inner peripheral side of the disk and the torque receiving surface side.
The pad spring is provided at a base portion of the bridge portion that abuts on the disc entry side end surface, a first spring piece that extends from the base portion to the disc entry side, and a tip of the first spring piece, and the suspension is provided. A disc brake for a vehicle , comprising: a second spring piece that abuts on a lower piece and urges the pair of friction pads on the inner peripheral side of the disc and the torque receiving surface side. A claim characterized in that a locking portion of the pad spring is provided on the disc entry side end surface of the bridge portion, and the pad spring includes a locking piece locked to the locking portion. Item 1. The vehicle disc brake according to item 1. The vehicle disc brake according to claim 2 , wherein the locking portion is formed on the action portion side and the reaction portion side of the end surface on the disc entry side. The vehicle disc brake according to claim 2 , wherein the locking portion is formed at a central portion in the disc axial direction of the end surface on the disc entry side. An action portion arranged on one side of the disc rotor and having a cylinder hole for accommodating a piston and a reaction portion arranged on the other side of the disc rotor and having a reaction force claw are connected by a bridge portion. A caliper body is formed, and the caliper body is provided on a caliper bracket fixed to the vehicle body on one side of the disc rotor so as to be movable in the disc axial direction via a slide pin, and a pair of frictions sandwiching the disc rotor. A pad is arranged, and the pair of friction pads are suspended by a hanger pin spanning the action portion and the reaction portion in the disc axial direction, and the braking torque from the friction pad is applied to the caliper bracket. In vehicle disc brakes provided with a torque receiving surface
The friction pad has a hanging piece through which the hanger pin is inserted on the disc entry side when the vehicle is moving forward, and the caliper body is outside the outer peripheral surface of the disc rotor of the action portion and the reaction portion. A hanger pin mounting boss portion for mounting the hanger pin is provided at the position and on the disc turning side of the bridge portion on the disc turning side end surface when the vehicle is moving forward.
A pad spring is attached to the end surface of the bridge portion on the disk entry side to abut the hanging piece and urge the pair of friction pads to the inner peripheral side of the disk and the torque receiving surface side.
A locking portion of the pad spring is provided on the end surface of the bridge portion on the disk entry side, and the pad spring includes a locking piece that is locked to the locking portion.
A vehicle disc brake characterized in that the locking portion is formed at a central portion in the disc axial direction of the end surface on the disc entry side. The pad spring is provided at a base portion of the bridge portion that abuts on the disc entry side end surface, a first spring piece that extends from the base portion to the disc entry side, and a tip of the first spring piece, and the suspension is provided. The vehicle disc brake according to claim 5, further comprising a second spring piece that abuts on the lowering piece and urges the pair of friction pads on the inner peripheral side of the disc and the torque receiving surface side. ..

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