JP2516249Y2 - Caliper body for vehicle disc brakes - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a disc brake mounted on a vehicle such as a four-wheel vehicle and a motorcycle, and more particularly to a structure for improving the rigidity of an action portion having a plurality of cylinder holes.

[0002]

2. Description of the Related Art Conventionally, in a so-called multi-pot type caliper body having three or more cylinder holes in its operating portion, a seal groove for mounting a piston seal is formed on the inner peripheral surface of each cylinder hole. However, since the partition wall between the cylinder holes is formed thick so that the adjacent seal grooves do not interfere with each other, the width of the caliper body in the disk circumferential direction is large.

For this reason, for example, in Japanese Unexamined Patent Publication (Kokai) No. 4-153327, adjacent seal grooves are arranged so as to be displaced in the cylinder axial direction, and the length from each seal groove to the bottom wall of the cylinder hole is formed to be the same. By forming the bottom wall of each cylinder hole to have the same thickness, the rigidity of the caliper is increased while suppressing the width of the caliper, and the deformation in the cylinder axial direction due to the braking reaction force is suppressed.

[0004]

However, by alternately arranging the deep-bottomed cylinder holes and the shallow-bottomed cylinder holes in this manner, although the rigidity is slightly increased, the deformation in the cylinder axial direction due to the braking reaction force is caused. As a structure to suppress
It wasn't enough. Especially, in the vicinity of the central part of the acting part that is the center of thrust, the deformation that expands outward is larger than that on both sides, the hydraulic chamber between the bottom wall of the cylinder hole and the piston expands, and so-called hydraulic pressure loss occurs. However, there remains a problem that the responsiveness to braking operation is poor.

Therefore, the present invention provides a caliper body for a disc brake for a vehicle, which has a higher rigidity, particularly in the vicinity of the central portion of the action portion, and is excellent in responsiveness and can obtain a stable braking force. It is an object.

[0006]

In order to achieve the above-mentioned object, the present invention provides a disk having three or more cylinder holes which are open to the disk rotor side, in a working portion arranged at a side part of the disk rotor. In a caliper body of a vehicle disc brake arranged side by side in the rotor circumferential direction, at least two of the cylinder holes, a disc entry side and a delivery side, are formed deep and the other cylinder holes are shallow. It is characterized in that it is formed on the bottom, and reinforcing ribs are formed on the outer surfaces of the bottom walls of these shallow cylinder holes over the bottom walls of the deep cylinder holes.

[0007]

As a result, the vicinity of the center of the acting portion, which has conventionally been low in rigidity, is reinforced by the ribs, and the ribs are further connected to the bottom wall of the deep cylinder hole, whereby the rigidity is further enhanced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a front brake of a motorcycle will be described below with reference to the drawings.

The disc brake 1 includes a caliper bracket 3 fixed to the vehicle body on one side of a disc rotor 2 which rotates in the direction of arrow A, and a cantilever support on the bracket 3 through a pair of sliding pins 4 and 5. Caliper body 6
The disk rotor 2 has a pair of friction pads 7 and 7 which are arranged opposite to each other.

The caliper body 6 is a three-pot two-system system in which the three cylinder holes 9, 9, 10 formed in the operating portion 6a are divided into two hydraulic pressure paths, and the caliper body 6 is arranged on both sides of the disc rotor 2. The acting portion 6a and the reaction portion 6b that are provided are connected by a bridge portion 6c that straddles the outer circumference of the disk rotor 2. Mounting arms 6d and 6e are projectingly provided on the disc entry and exit sides of the action portion 6a, and the caliper body 6 inserts the above-mentioned sliding pins 4 and 5 into these attachment arms 6d and 6e. Alternatively, it is provided so as to project and is supported so as to be movable in the disc axial direction.

The above-mentioned friction pads 7, 7 are arranged so as to face each other with the disc rotor 2 interposed between the action portion 6a and the reaction portion 6b. Each friction pad 7 is formed by joining a lining 7a and a back plate 7b. The disc entry side of the back plate 7b is suspended by a hanger pin 8 mounted on the caliper bracket 3, and the back plate 7b is also suspended. The disc extension side is loosely fitted into the pad guide hole 3b provided in the caliper support arm 3a of the caliper bracket 3, and the caliper body 6 described above is inserted.
In the same manner as above, it is suspended so as to be movable in the disc axial direction.

The above-mentioned cylinder holes 9, 9, 10 formed in the action portion 6a have two deep sides at the disk entry and exit sides, and a shallow one at the center. Cup-shaped pistons 11, 11, 12 having different lengths are inserted in the cylinder holes 9, 9, 10, respectively.
Hydraulic chambers 13, 13, 14 are defined between 1, 11, 12 and the bottom walls 6f, 6f, 6g.

On the inner peripheral surface of each cylinder hole 9, 9, 10,
Small-diameter seal grooves 9a, 9a, 10a are provided on the opening side, and large-diameter seal grooves 9b, 9b, 10b are provided on the bottom side. Seal grooves 9a, 9a, 10a on the opening side
A dust seal 15 is fitted into each of the cylinders to prevent dust and the like from entering the inside of the cylinder hole. Further, since the seal grooves 9b, 9b, 10b on the bottom side are larger in diameter than the opening side, they are provided so as to be alternately shifted in the cylinder axial direction, and the seal grooves 9b, 9b, 10b are respectively provided with liquids. Piston seals 16 for sealing the pressure chambers 13, 13 and 14 in a liquid-tight manner are mounted respectively.

Bottom walls 6f, 6 of each cylinder hole 9, 9, 10
f and 6g have the same thickness, and the bottom walls 6f and 6f of the deep-bottom cylinder holes 9 and 9 on both sides project outward from the bottom wall 6g of the shallow-bottom cylinder hole 10. Further, the bottom wall 6g of the shallow cylinder hole 10 is provided with reinforcing ribs 6h in the disk circumferential direction on the outer surface of the disk outer peripheral side.
It is provided over f and 6f. This reinforcement rib 6h
Is formed with a thickness corresponding to a step between the bottom walls 6f, 6f on both sides and the bottom wall 6g at the center, and the outer surface of the bottom wall 6f, 6f
It is flush with 6f. A liquid passage hole 17 is provided inside the reinforcing rib 6h so as to penetrate the bottom walls 6f, 6f on both sides, and the liquid pressure chambers 13, 13 on both sides are communicated with each other through the liquid passage hole 17.

On the outer side wall of the working portion 6a in the radial direction of the disk, a union boss portion 6i for introducing the pressurized working fluid into the hydraulic pressure chambers 13, 13, 14 and the hydraulic pressure chambers 13, 1 are provided.
Bleeder boss 6j for discharging the air in 3, 14
And two are provided so as to project. One of the union boss portion 6i and the bleeder boss portion 6j communicate with the central hydraulic chamber 14, and the remaining one of the union boss portion 6i is the hydraulic chamber 13 on the disc entry side and the bleeder boss portion 6j.
And the remaining one of them is in communication with the hydraulic chambers 13 on the side where the disks are fed out, and the caliper body 6 has the hydraulic chambers 1 on both sides.
It is divided into two systems, that is, a hydraulic pressure path in which 3 and 13 are communicated with each other through a liquid through hole 17 and a hydraulic pressure path using only the central hydraulic chamber 14.

The present embodiment is configured as described above,
In the working portion 6a of the caliper body 6, the depths of the three cylinder holes 9, 9, 10 are changed so that the seal grooves 9b, 9b, 1 are formed.
By shifting the formation position of 0b, the cylinder hole 9,
The partition 6k between 9 and 10 is suppressed to the same thickness as the conventional one. Further, at the central bottom wall 6g which is easily bent outward by the braking reaction force, the outside is reinforced by the reinforcing ribs 6h with the minimum necessary thickness, and both ends of the reinforcing ribs 6g are fixed to the bottom walls 6f on both sides. By connecting to 6f, the rigidity is further enhanced.

As a result, the operating portion 6 of the caliper body 6
In a, the outward deformation due to the braking reaction force is caused by the reinforcing rib 6h.
The hydraulic pressure loss due to the expansion of the hydraulic chambers 13, 13, 14 to the outside is reduced as much as possible, and therefore the responsiveness to the braking operation is excellent and a stable braking force can be obtained.

Further, since the reinforcing rib 6h is used to form the liquid passage hole 17 for communicating the hydraulic chambers 13 and 13 therein, a special shape for forming the liquid passage hole is not used.
Further, the protruding height of the reinforcing rib 6h is set to the bottom walls 6f, 6f on both sides.
The outer shape of the caliper body 6 may be the same as the conventional one, and the weight may be slightly increased by the amount of the reinforcing rib 6h.

According to the present invention, it is sufficient to arrange deep-bottomed cylinder holes at least on both sides of the working portion and to form one of the intermediate cylinder holes in the shallow bottom, and in the case of three or more holes, other The depth of the cylinder hole does not matter. Further, the reinforcing ribs may be formed on the center portion of the bottom wall of the shallow cylinder hole or on the inner peripheral side of the disc.

[0020]

As described above, according to the present invention, among the plurality of cylinder holes arranged in parallel in the working portion of the caliper body,
At least two cylinder holes on the disk entry and exit sides are formed in the deep bottom, other cylinder holes are formed in the shallow bottom, and reinforcing ribs are formed on the outer surface of the bottom wall of these other cylinder holes. By connecting both ends of the rib to the bottom wall of the deep cylinder hole, it is possible to prevent the deformation of the action part due to the braking reaction force as much as possible, especially at the bottom wall of the central cylinder hole. The occurrence of loss is extremely small, and a braking force that immediately responds to the braking operation can be stably obtained.

[Brief description of drawings]

1 is a sectional view taken along line I-I of FIG.

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4, 5 ... Sliding pin, 6 ... Caliper body, 6a ... Working part, 6b ... Reaction part, 6c ... Bridge part, 6e, 6f ... Bottom wall, 6h ... Reinforcing ribs, 7 ... Friction pad, 7a ... Lining, 7b ... Back plate, 9, 10 ... Cylinder hole, 9a, 9b, 10a, 10b ... Seal groove, 11,
12 ... Piston, 13, 14 ... Hydraulic chamber, 16 ... Piston seal

Claims (1)

(57) [Scope of utility model registration request] 1. A caliper body for a disc brake for a vehicle, wherein three or more cylinder holes, which open toward the disc rotor, are arranged in parallel in a circumferential direction of the disc rotor in an action portion arranged on a side portion of the disc rotor. Of the cylinder holes, at least two cylinder holes on the disk entry side and the disk exit side are formed in the deep bottom, and the other cylinder holes are formed in the shallow bottom, and the outer walls of the bottom walls of these shallow bottom cylinder holes are formed. ,
A caliper body for a vehicle disc brake, wherein reinforcing ribs are provided on the bottom wall of the deep-bottomed cylinder hole.