JPH0581539U - Vehicle disc brake caliper body - Google Patents

Abstract

(57) [Summary] [Purpose] The bottom wall of the cylinder hole is reinforced, especially the rigidity around the union hole is enhanced so that the tightening torque of the union bolt does not distort the vicinity of the union hole. Deformation of the female screw in the hole makes it difficult to attach and remove the union bolt, and the joint part of the union hole is
So that it does not affect performance. [Structure] The outer periphery of a union hole 10 formed in a bottom wall 2e is surrounded by a U-shaped peripheral wall 2g. Two reinforcing ribs 2h, 2
i is projected from the peripheral wall 2g so as to traverse the bottom wall 2e in the disk center direction. The peripheral wall 2g and the reinforcing ribs 2h and 2i are connected to each other so as to complement each other's rigidity forces and to withstand high external forces.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake mounted on a vehicle such as an automobile and a motorcycle, and more particularly to a structure in which a caliper body used for the disc brake has improved rigidity.

[0002]

[Prior Art]

 In the case of a disc brake caliper body in which the piston inserted in the cylinder hole of the action part is pushed by the hydraulic fluid supplied to the hydraulic chamber at the bottom of the cylinder hole, the hydraulic fluid boosted to the hydraulic chamber is used. A union hole for introducing the cylinder is opened in the bottom wall or the peripheral wall of the cylinder hole depending on the arrangement of the caliper body and the layout of the brake hose.

Among these, as a conventional example in which a union hole is provided in the bottom wall of a cylinder hole, there is, for example, the one shown in FIG. 1 of Japanese Utility Model Publication No. 55-127139, which is connected to a hydraulic master cylinder. The kihose is mounted by inserting a union bolt into a banjo fixed to the tip and screwing the union bolt into the union hole. In addition, a guide wall is erected near the opening of the union hole, and the neck of the connection pipe of the banjo is fitted into the recessed fitting groove of the guide wall to allow the brake hose to move. -The direction of the hose is set so that the setting direction of the brake hose does not deviate due to external force after screwing the union bolt or after mounting.

By the way, in recent years, since the bottom wall of the cylinder hole tends to be formed as thin as possible in order to reduce the weight of the caliper body, the bottom wall is also used for the high pressure force of the hydraulic fluid supplied to the hydraulic chamber. In order not to bend, for example, as shown in FIG. 1 of Japanese Utility Model Publication No. 62-34035, there is a projecting reinforcing rib on the outer surface of the bottom wall.

[0005]

[Problems to be Solved by the Invention] However, in the bottom wall of the cylinder hole, at the opening of the union hole, meat is stolen and becomes fragile, and the tightening torque at the time of screwing the union bolt causes the distortion. There is a risk that the female thread of the union hole will be deformed to make it difficult to attach and remove the union bolt, or that the sealing performance of the connecting part between the union hole, union bolt and banjo will be affected. ..

Therefore, the present invention provides a caliper body for a vehicle disk brake that solves the above-mentioned problems by ensuring the necessary strength for the entire bottom wall of the cylinder hole including the vicinity of the opening of the union hole. It is an object.

[0007]

[Means for Solving the Problems]

 According to the above-mentioned object, the present invention inserts a piston for pressing a friction pad against a side surface of a disc rotor into a cylinder hole formed in a working portion arranged on a side portion of the disc rotor, A hydraulic chamber is defined between the piston and the bottom wall of the cylinder hole, and a union hole for introducing the boosted hydraulic fluid into the hydraulic chamber is opened in the bottom wall of the cylinder hole, and the outer surface of the bottom wall is reinforced. In a caliper body of a vehicle disk brake having ribs, a peripheral wall surrounding the entire opening of the union hole or most of the opening is erected on the outer surface of the bottom wall of the cylinder hole. The feature is that the peripheral wall and the above-mentioned reinforcing rib are connected.

[0008]

[Action]

 According to this structure, the rigidity of the entire bottom wall due to the thinning is secured by the reinforcing ribs and the peripheral wall. Particularly in the vicinity of the union hole, the rigidity is enhanced by the peripheral wall that surrounds most of the union hole. In addition, since the reinforcing ribs and the peripheral wall are continuous, the individual rigidity forces complement each other. Therefore, it is possible to endure external force with a higher rigidity force than when the peripheral wall and reinforcing ribs are provided separately. You can

[0009]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

The caliper body 2 used for the disc brake 1 is mounted on a caliper bracket 4 fixed to the vehicle body on one side of the disc rotor 3 by means of two sliding pins 5 and 5. It is a pin slide type that is guided in the direction, and has a structure in which an action portion 2a and a reaction portion 2b, which are arranged with the disc rotor 3 sandwiched therebetween, are connected by a bridge portion 2c that straddles the outer periphery of the disc rotor 3. ing.

The action portion 2a supported by the caliper bracket 4 is provided with a cylinder hole 6 on the disc rotor side, and the reaction portion 2b on the opposite side is provided with a reaction force claw 2d. A pair of friction pads 7, 7 are provided between the cylinder hole 6 and the reaction force pawl 2d so as to be movable in the disc axial direction with the disc rotor 3 interposed therebetween.

A cylindrical piston 8 having a bottom is inserted in the cylinder hole 6 so as to be liquid-tight and movable, and a space defined between the piston 8 and the bottom wall 2 e of the cylinder hole 6 is hydraulically operated. It is called Room 9. On the outer surface of the bottom wall 2e, a boss portion 2f, a U-shaped peripheral wall 2g, and two reinforcing ribs 2h and 2i are projected. The boss portion 2f is formed in a circular shape at a position slightly offset from the center of the circular bottom wall 2e toward the outer peripheral side of the disc. The boss portion 2f introduces the hydraulic fluid into the hydraulic chamber 9. A union hole 10 for opening is opened.

A banjo of a brake hose is attached to the union hole 10 by a union bolt as in the conventional case, and the working fluid boosted by a separately provided hydraulic master cylinder is supplied to the brake hose. The air introduced into the hydraulic chamber 9 through the gas passage and mixed in this path is discharged to the outside from the brewer hole 2k formed in the outer peripheral wall 2j of the cylinder hole 6. The hole 2k is normally closed by a brewer screw 11.

The peripheral wall 2g and the reinforcing ribs 2h and 2i have the same height and are approximately twice as large as the boss portion 2f. Of these, the peripheral wall 2g surrounds the 3/4 circumference of the boss portion 2f excluding the disc outer peripheral side, and both ends thereof extend in parallel to the disc outer peripheral side and stand in a U shape so as to reach the outer peripheral edge of the bottom wall 2e. Further, the two reinforcing ribs 2h and 2i are provided so as to project from the peripheral wall 2g so as to cross the bottom wall 2e toward the center of the disc. A fitting groove 2m is provided in a part of the peripheral wall 2g, and the neck portion of the connecting pipe of the banjo is fitted into the groove 2m to set the direction of the brake hose in a predetermined direction.

In this way, the bottom wall 2e of the cylinder hole 6 surrounds the outer periphery of the boss portion 2f with the U-shaped peripheral wall 2g, and the remaining portion of the bottom wall 2e excluding the vicinity of the boss portion 2f. Since the reinforcing ribs 2h, 2i are provided, the bottom wall 2e can be made thin, yet a necessary and sufficient rigidity can be secured, and the pressure of the hydraulic fluid is not easily distorted. Moreover, since the individual rigidity forces complement each other by making the peripheral wall 2g and the reinforcing ribs 2h, 2i continuous, as compared with the case where the peripheral wall 2g and the reinforcing ribs 2h, 2i are provided independently, With higher rigidity, it can withstand external force. Particularly, in the union hole 10 which receives the tightening torque when the union bolt is screwed in, most of the outer circumference of the boss portion 2f is surrounded by the high peripheral wall 2g, so that the rigidity is further enhanced, and thereby the union hole 10 is deformed. This makes it difficult to attach and remove the union bolt, and does not adversely affect the seal performance of the union hole and the connecting portion of the union bolt and the banjo.

The peripheral wall around the union hole may have a shape of the entire circumference or a shape close to the entire circumference, and the number, shape, and arrangement of the reinforcing ribs can be freely set as necessary.

[0017]

[Effect of the device]

 As described above, in the caliper body of the present invention, the reinforcing ribs are projected on the outer surface of the bottom wall of the cylinder hole, and the peripheral wall is erected around the opening of the union hole formed in the bottom wall. Although it is thin, it is possible to secure necessary and sufficient rigidity, and distortion of the hydraulic fluid pressure is less likely to occur. Moreover, by connecting the peripheral wall and the reinforcing ribs, the respective rigidity forces complement each other, so that it is possible to withstand the external force with a higher rigidity force as compared with the case where the peripheral wall and the reinforcing ribs are individually provided. it can. In particular, in the union hole that receives the tightening torque when the union bolt is screwed in, since the peripheral wall surrounds most of the outer circumference, the rigidity is further enhanced, and the female screw in the union hole is prevented from being deformed by the tightening torque as much as possible. , It is possible to eliminate the adverse effects such as making it difficult to attach and remove the union bolt, and adversely affecting the seal performance of the union hole and the connecting part of the union bolt and the banjo.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a caliper body showing an embodiment of the present invention.

FIG. 2 is a disc blur using the caliper body of FIG.
Partial cross-sectional plan view of Ki

FIG. 3 is a front view of FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Caliper body, 2a ... Action part, 2b ... Reaction part, 2c ... Bridge part, 2e ... Bottom wall of cylinder hole 6, 2f ... Boss part, 2g ... Peripheral wall, 2h, 2
i ... Reinforcing ribs, 2m ... Fitting groove, 3 ... Disc rotor, 6
... Cylinder hole, 7 ... Friction pad, 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Union hole

Claims (1)

[Scope of utility model registration request] 1. A friction pad is provided with a friction pad in a cylinder hole formed in a working portion arranged on a side portion of the disc rotor.
A union that inserts a piston that presses against the side surface of the cylinder to define a hydraulic chamber between the piston and the bottom wall of the cylinder hole, and introduces the boosted hydraulic fluid into the hydraulic chamber into the bottom wall of the cylinder hole. In a caliper body of a vehicle disk brake in which a hole is opened and a reinforcing rib is projected on the outer surface of the bottom wall, a peripheral wall is erected around the opening of the union hole, and the peripheral wall and the reinforcing rib are provided. A disc brake caliper body for vehicles that is connected.