Technical Field [0001]
The present invention relates to a vehicular disc brake used in a vehicle such as an automobile or a motorcycle and, more particularly, to a vehicular disc brake that hangs a pair of friction pads using a hanger pin suspended in the disc shaft direction across a disc rotor.
Background Art [0002]
Conventionally, in a vehicular disc brake having a caliper body of pin slide type, a pair of friction pads are disposed facing each other so as to sandwich a disc rotor between the action part and the reaction part of the caliper body, a pair of suspension parts are disposed on the disc outer peripheral side of the back plates of the friction pads so as to protrude, and the suspension parts are hung by a pair of hanger pins spanning across the action part and the reaction part in the disc shaft direction (see, for example, PTL 1). However, in a vehicular disc brake as disclosed in PTL 1, since two hanger pins are disposed inside the caliper body, the

friction pads cannot be replaced in the state in which the friction pads and the caliper body are assembled to the body of a vehicle, and the replacement of the friction pads needs a lot of time. [0003]
Accordingly, the suspension pieces of the friction pads protrude toward the disc turn-in side of the bridge section of the caliper body so that the suspension pieces are hung by one hanger pin spanning across the action part and the reaction part in the disc shaft direction (see, for example, PTL 2).
Citation List Patent Literature [0004]
PTL 1: JP-UM-A-2-16836
PTL 2: JP-A-2004-132449
Summary of Invention Technical Problem [0005]
However, in the vehicular disc brake disclosed in PTL 2 above, although the friction pads can be replaced by removing the hanger pin even in the state in which the friction pads and the caliper body are assembled to the caliper bracket, the action part and the reaction part of the caliper body protrude

toward the disc turn-out side of the bridge section and the bridge section and the hanger pin spans across them, thereby increasing the size and weight of the caliper body. [0006]
An object of the invention is to provide a vehicular disc brake that can replace the friction pads favorably while reducing the size of the caliper body.
Solution to Problem [0007]
To achieve the above object, a vehicular disc brake according to the invention includes; a caliper body including an action part disposed on one side of a disc rotor and having a piston, a reaction part disposed on the other side of the disc rotor and having a reaction force claw, and a bridge section for coupling the action part to the reaction part; a caliper bracket supporting the caliper body slidably in a disc shaft direction via a pair of slide pins, the caliper bracket fixed to a body of a vehicle on the one side of the disc rotor; a pair of friction pads disposed between the action part and the reaction part so as to sandwich the disc rotor, the friction pads facing each other; suspension parts provided on the friction pads; and a hanger pin spanning across the action part and the reaction part in the disc shaft direction, the hanger pin hanging the suspension parts, in which the friction pads

have the pad suspension parts formed outward in a disc radial direction on a disc turn-in side during forward movement of the vehicle and a torque transmission part for transmitting a braking torque while being in contact with a torque receiving part provided either the caliper body or the caliper bracket on a disc turn-out side and in which the caliper body has, in a disc rotor side surface of the bridge section, a housing recess in which the pad suspension parts are housed movably in the disc shaft direction. [0008]
In addition, preferably, the friction pads have, on outer surfaces on the disc turn-in side, knob pieces protruding outward from the caliper body. In addition, preferably, the friction pads become removable from the caliper body in a state in which the caliper body is assembled to the caliper bracket by removing the hanger pin from the caliper body and turning the disc turn-in side of the friction pads inward in the disc radial direction.
Advantageous Effects of Invention [0009]
In the vehicular disc brake according to the invention, since the friction pads hang, inside the caliper body, the pad suspension parts formed outward in a disc radial direction on a disc turn-in side using one hanger pin, it is possible to

replace the friction pads by removing the hanger pin even in the state in which the caliper body and the friction pads are assembled to the caliper bracket while reducing the size of the caliper body. [0010]
In addition, since knob pieces protruding outward from the caliper body are provided on outer surfaces on the disc turn-in side of the friction pads, the friction pads can be replaced favorably by holding the knob pieces. In addition, since the friction pad becomes removable from the caliper body in a state in which the caliper body is assembled to the caliper bracket by removing the hanger pin from the caliper body and turning the disc turn-in side of the friction pad inward in the disc radial direction, the friction pad close to the action part on which the caliper bracket is disposed can also be replaced easily.
Brief Description of Drawings [0011]
[Fig. 1] Fig. 1 is a cross sectional view taken along line I-I in Fig. 3.
[Fig. 2] Fig. 2 is a cross sectional view taken along line II-II in Fig. 3.
[Fig. 3] Fig. 3 is a side view illustrating a vehicular disc brake according to an embodiment of the invention.

[Fig. 4] Fig. 4 is a cross sectional view taken along line IV-IV in Fig. 6.
[Fig. 5] Fig. 5 is a plan view illustrating the vehicular disc brake according to the embodiment of the invention.
[Fig. 6] Fig. 6 is a front view illustrating the vehicular disc brake according to the embodiment of the invention.
[Fig. 7] Fig. 7 is an explanatory diagram illustrating the state in which the slide pin has been removed and the friction pad has been rotated when the friction pad close to the action part is removed.
[Fig. 8] Fig. 8 is an explanatory diagram illustrating the case in which the friction pad close to the action part is extracted.
[Fig. 9] Fig. 9 is an explanatory diagram illustrating the case in which the friction pad close to the reaction part is removed.
Description of Embodiments
[0012]
Figs. 1 to 9 illustrate the vehicular disc brake according to the embodiment of the invention, arrow A indicates the rotation direction of a disc rotor rotating together with a wheel during forward movement of a vehicle, and the disc turn-out side and the disc turn-in side described below assume

the forward travel of the vehicle.
[0013]
A vehicular disc brake 1 according to the embodiment includes a disc rotor 2 rotating together with a wheel (not illustrated) during movement of the vehicle, a caliper bracket 3 attached to the body of the vehicle on one side of the disc rotor 2, a caliper body 6 of pin slide type supported by the caliper bracket 3 slidably in the disc shaft direction via a pair of slide pins 4 and 5, a hanger pin 7 spanning across an action part 6a and a reaction part 6b of the caliper body 6, and a pair of friction pads 8 and 9 facing each other so as to sandwich the disc rotor 2, the friction pads 8 and 9 being hung by the hanger pin 7.
[0014]
The caliper body 6 includes the above action part 6a and the reaction part 6b disposed on both sides of the disc rotor 2, and a bridge section 6c coupling these parts across the outer periphery of the disc rotor 2 and a shrunk pad spring 10 is provided between the bridge section 6c and the friction pads 8 and 9. The action part 6a is provided with three bottomed cylinder holes 6d opened toward the disc rotor 2 and the reaction part 6b is provided integrally with four reaction force claws 6e. A piston 11 is inserted into each of the cylinder holes 6d in a liquid tight manner and a hydraulic chamber 12 is defined between the piston 11 and the bottom of

the cylinder hole 6d. [0015]
A female screw part 6f to which the hanger pin 7 is attached is formed on the disc turn-in side of the action part 6a and a pin insertion section 6g into which the hanger pin 7 is inserted is formed on the disc turn-in side of the reaction part so that the female screw part 6f and the pin insertion section 6g are concentric with each other. The female screw part 6f includes a female screw hole 6h which is formed away from the disc rotor and has a large diameter and a first shaft part insertion hole 6i which is formed close to the disc rotor and has a diameter smaller than in the female screw hole 6h and through which the shaft part of the hanger pin 7 passes. A conical step part is formed between the female screw hole 6h and the first shaft part insertion hole 6i. The pin insertion section 6g includes a second shaft part insertion hole 6j which is formed close to the disc rotor and through which a shaft part 7a of the hanger pin 7 passes, a small-diameter hole 6k which communicates with the second shaft part insertion hole 6j and has a diameter smaller than in the second shaft part insertion hole 6j , and a large-diameter hole 6m which is continued to the small-diameter hole 6k and opened opposite to the disc rotor and the large-diameter hole 6m is formed in a mortar having a diameter gradually increasing from the small-diameter hole 6k toward the opening.

[0016]
In the action part 6a, a first vehicle body mount arm 6n protrudes on the disc turn-out side, a second vehicle body mount arm 6p protrudes inward in the disc radial direction, and one slide pin 4 of the slide pins passes through the first vehicle body mount arm 6n. One slide pin 4 fits the screw part to a first slide pin mount arm 3a of the caliper bracket 3, brings a flange part 4a of the slide pin 4 into contact with one side surface of the caliper bracket 3, and screws a cylindrical torque receiving pin 13 (torque receiving part in the invention) with a screw part 4b protruding toward the other side surface of the caliper bracket 3 . This causes the torque receiving pin 13 to be disposed toward the reaction part while spanning across the outer periphery of the disc rotor 2 in the disc shaft direction on the disc turn-out side of the bridge section 6c. The other slide pin 5 is disposed on a second slide pin mount arm 3b of the caliper bracket 3 so as to protrude away from the disc rotor and the tip thereof is inserted into the second vehicle body mount arm 6p. In addition, a housing recess 6q in which pad suspension parts 8a and 9a provided on the friction pads 8 and 9 are housed movably in the disc shaft direction is formed on the disc turn-in side of the disc rotor side surface of the bridge section 6c.
[0017]
The friction pads 8 and 9 are configured to have linings

8b and 9b in slidable contact with the side surfaces of the disc rotor 2 fixed to back plates 8c and 9c made of metal, the pad suspension parts 8a and 9a protrude outward in the disc radial direction on the disc turn-in side of the back plates 8c and 9c, and hanger pin insertion holes 8d and 9d are made in the pad suspension parts 8a and 9a . In addition, knob pieces 8e and 9e protruding outward from the caliper body 6 when the friction pads 8 and 9 are assembled to the caliper body 6 are formed on the outer surfaces on the disc turn-in side of the back plates 8c and 9c.
[0018]
An ear piece 8f supported by the caliper bracket 3 protrudes on the disc turn-out side of the back plate 8c of the friction pad 8 close to the action part and a torque transmission surface 8g (torque transmission part in the invention) for transmitting a braking torque during braking to the caliper bracket 3 is formed on the disc turn-out side of the back plate 8c. In addition, as illustrated in Fig. 7, the friction pad 8 close to the action part is formed in a shape that enables the friction pad 8 to pass through a space El formed between an opening end PI on the disc turn-in side of the housing recess 6q and an end P2 of the second slide pin mount arm 3b when the disc turn-in side is turned inward in the disc radial direction.
[0019]

A bifurcated torque transmission arm 9f (torque transmission part in the invention) is formed on the disc turn-out side of the back plate 9c of the friction pad 9 close to the reaction part and the torque transmission arm 9f makes contact with the torque receiving pin 13. [0020]
The caliper bracket 3 is formed by press work of one plate and has the first slide pin mount arm 3a protruding outward in the disc radial direction on the disc turn-out side and the second slide pin mount arm 3b protruding inward in the disc radial direction on the disc turn-in side. In the first slide pin mount arm 3a, a slide pin fitting hole to which the slide pin 4 is fitted is formed on the disc outer periphery side and a bolt hole 3c (mount part in the invention) to which one vehicle body mounting bolt is fitted is formed on the disc turn-out side of the slide pin fitting hole. In addition, on the disc inner peripheral side of the first slide pin mount arm 3a, a torque receiving surface 3d (torque receiving part in the invention) for receiving a torque from the friction pad 8 close the action part during braking and a support part 3e for supporting the ear piece 8f formed on the friction pad 8 close to the action part are formed orthogonally to each other. The second slide pin mount arm 3b is provided with a slide pin insertion hole 3f to which the other slide pin 5 is fixed and a bolt hole 3g (mount part in the invention) to which the other

vehicle body mounting bolt is fitted on the disc inner peripheral side of the slide pin insertion hole 3f.
[0021]
The hanger pin 7 has a male screw part 7b having a diameter larger than the shaft part on one end side of the shaft part 7a and a small-diameter shaft part 7c having a diameter smaller than the shaft part 7a on the other end side and has, between the male screw part 7b and the shaft part 7a, a conical section having a diameter gradually reducing from the male screw part 7b to the shaft part. The small-diameter shaft part 7c has a circumferential groove 7d to which a retaining member 14 is fitted around the circumference thereof on the other end side and has a conical head part 7e having a diameter gradually reducing toward the end part on the other end side of the circumferential groove 7d. The retaining member 14 is made of resin such as, for example, polypropylene, formed in a C-shape, and has an outer diameter slightly larger than the inner diameter of the small-diameter hole 6k.
[0022]
When the friction pads 8 and 9 are assembled to the caliper bracket 3 and the caliper body 6 formed as described above, the ear piece 8f of the friction pad 8 of the action part is supported by the support part 3e and the torque receiving surface 3d of the caliper bracket 3 is brought into contact with the torque transmission surface 8g of the friction pad

8. In addition, the torque transmission arm 9f of the friction pad 9 close to the reaction part is brought into contact with the torque receiving pin 13 to support the friction pad 9. In this state, the pad suspension parts 8a and 9a of the friction pads 8 and 9 are housed in the housing recess 6q of the bridge section 6c and the hanger pin insertion holes 8d and 9d and the female screw part 6f and the pin insertion section 6g of the caliper body 6 are disposed so that the axial lines thereof are aligned. [0023]
Next, the hanger pin 7 with the retaining member 14 fitted to the circumferential groove 7d is passed through the female screw hole 6h, the first shaft part insertion hole 6i, the hanger pin insertion holes 8d and 9d, the second shaft part insertion hole 6j , and the small-diameter hole 6k in sequence, the male screw part 7b is screwed with the female screw hole 6h, and the step part formed between the female screw hole 6h and the first shaft part insertion hole 6i is brought into contact with the conical section formed between the male screw part 7b and the shaft part 7a. The retaining member 14 is passed through the small-diameter hole 6k while being compressed and disposed in the large-diameter hole 6m, the head part 7e protrudes externally from the large-diameter hole 6m, and the hanger pin 7 is prevented from being removed by the small-diameter hole 6k and the retaining member 14 having a

diameter slightly larger than the small-diameter hole 6k. [0024]
In addition, when the friction pads 8 and 9 are removed from the caliper body 6 to replace the friction pads 8 and 9, the male screw part 7b of the hanger pin 7 is loosened and the hanger pin 7 is drawn from the small-diameter hole 6k, the second shaft part insertion hole 6j , the hanger pin insertion holes 8d and 9d, the first shaft part insertion hole 6i, and the female screw hole 6h while the retaining member 14 is compressed. Next, as illustrated in Fig. 7, the friction pad 8 close to the action part can be removed to the outside of the caliper body 6 through the space El by holding the knob piece 8e, turning the disc turn-in side of the friction pad
8 inward in the disc radial direction, and pulling out the knob
piece 8e to the disc turn-in side as illustrated in Fig. 8 to
separate the ear piece 8f from the support part 3e, pass the
outside in the disc radial direction of the back plate 8c
through the opening end PI, and pass the inside in the disc
radial direction of the back plate 8c through the end P2. In
addition, the new friction pad 8 to replace the removed one
can be also inserted into a predetermined position easily via
the space El.
[0025]
In contrast, as illustrated in Fig. 9, the friction pad
9 of the reaction part can be removed to the outside of the

caliper body 6, through the clearance between the reaction force claws 6e and the disc rotor 2, by holding the knob piece 9e, turning the disc turn-in side of the friction pad 9 inward in the disc radial direction, and pulling out the knob piece 9e to the disc turn-in side to separate the torque transmission arm 9f from the torque receiving pin 13 . In addition, the new friction pad 9 to replace the removed one can be also inserted into a predetermined position easily via the clearance between the reaction force claws 6e and the disc rotor 2. [0026]
In the embodiment, as illustrated above, since the one hanger pin 7 hangs, inside the caliper body 6, the pad suspension parts 8a and 9a formed outward in a disc radial direction on a disc turn-in side, the friction pads 8 and 9 can be replaced by removing the hanger pin 7 while the size of the caliper body 6 is reduced even in the state in which the caliper body 6 and the friction pads 8 and 9 are assembled to the caliper bracket 3. In addition, since the knob pieces 8e and 9e protruding outward from the caliper body 6 are formed on the outer surface of the disc turn-in side of the friction pads 8 and 9, the friction pads 8 and 9 can be replaced favorably by holding the knob pieces 8e and 9e . In addition, since the friction pad 8 can be attached or detached easily via the space El by removing the hanger pin 7 and turning the friction pad 8, the friction pad 8 close to the action part on which the

caliper bracket 3 is disposed can also be replaced easily. [0027]
The invention is not limited to the above embodiment, so the braking torque from the friction pads may be received by the caliper body and the shape of the torque transmission part provided on the friction pad and the shape of the torque receiving part provided on the caliper bracket or the caliper body may be arbitrary. In addition, the hanger pin is not limited to the embodiment, so the retaining structure is arbitrary as long as the hanger pin is attachable and detachable and a retaining member other than the C-shaped one may also be used. In addition, the number of pistons is not limited to the embodiment and is arbitrary.
Reference Signs List [0028]
1: vehicular disc brake
2: disc rotor
3 : caliper bracket
3a: first slide pin mount arm
3b: second slide pin mount arm
3c: bolt hole
3d: torque receiving surface
3e: support part
3f: slide pin insertion hole

3g: bolt hole
4: slide pin
4a: flange part
4b: screw part
5: slide pin
6: caliper body
6a: action part
6b: reaction part
6c: bridge section
6d: cylinder hole
6e: reaction force claw
6f: female screw part
6g: pin insertion section
6h: female screw hole
6i: first shaft part insertion hole
6j: second shaft part insertion hole
6k: small-diameter hole
6m: large-diameter hole
6n: first vehicle body mount arm
6p: second vehicle body mount arm
6q: housing recess
6r: disc rotor side surface
7: hanger pin
7a: shaft part
7b: male screw part

7c: small-diameter shaft part
7d: circumferential groove
7e: head part
8: friction pad
8a: pad suspension part
8b: lining
8c: back plate
8d: hanger pin insertion hole
8e: knob piece
8f: ear piece
8g: torque transmission surface
9: friction pad
9a: pad suspension part
9b: lining
9c: back plate
9d: hanger pin insertion hole
9e: knob piece
9f: torque transmission arm
10: pad spring
11: piston
12: hydraulic chamber
13: torque receiving pin
14: retaining member

We Claim:
[Claim 1]
A friction pad, hung on a caliper body via one hanger pin and in slidable contact
with a side surfaces of a disk rotor, comprising :
a pad suspension part with a hanger pin insertion hole on the disc turn-in side of a back plate of the friction pad,
wherein the pad suspension part protrudes outward in the disc radial direction and can be housed in the caliper body.
[Claim 2]
The friction pad according to claim 1, comprising a contact portion, which contacts with a pad spring provided in the caliper body, between the side surface of the disc turn-out side of the back plate and the pad suspension part.
[Claim 3]
The friction pad according to claims 1 to 2,
wherein an inner surface of the disc radial direction of the back plate has a curved shape.
[Claim 4]
The friction pad according to any one of claims 1 to 3,
wherein the friction pad is a pair of friction pads,
wherein the friction pad supports slidably the caliper body in the disc shaft direction via a slide pin by a caliper bracket, which is attached to a body of the vehicle on one side of a disc rotor,
wherein an end part on the disc turn-out side of the back plate of the friction pad close to an action part of the caliper body contacts with the caliper bracket, and
wherein n an end part on the disc turn-out side of the back plate of the friction pad close to a reaction part of the caliper body contacts with a torque receiving pin of the caliper body.
[Claim 5]
The friction pad according to any one of claims 1 to 4, comprising a knob piece on
the disc turn-in side from the pad hanging portion.
[Claim 6]
The friction pad according to claim 5,
wherein at least a portion of the knob piece protruding outward from the caliper body when the friction pad is assembled to the caliper body.