JPH1163040A - Caliper body for vehicle disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep sufficient rigidity force durable for braking reaction in a connection part between the action part and the bridge part of a caliper body to improve the durability and operating feeling of the capliper body, and avoid the increase of the weight of a reinforcing rib as much as possible as the other parts of the caliper body to keep comfortable feeling. SOLUTION: For this disc brake, a reinforcing rib 4v is upheavably provided on the outer face of the bridge part 4c to the axial direction of a disc. The reinforcing rib 4v has one end extended from the outer face of the bridge part 4c beyond the extension line L of a cylinder opening face passing through the connection part 4g on the side of the action part 4a to the outer face of the action part. The reinforcing rib 4v has the other end extended from the outer face of the bridge part 46 beyond the connection part on the side of the reaction part 4b to the outer face of the reaction part 4b. At one end of the reinforcing rib 4v, the maximum area of the reinforcing rib 4v is applied near the connection part 4g on the side of the action part to be long enough to cover the outer ends of reinforcing ribs 4t, 4u, so that the sectional area of the reinforcing rib 4v can be formed in almost triangle in a plan view, gradually reduced toward the reaction part 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a disc brake used for various traveling vehicles such as automobiles and motorcycles, and more particularly, to a caliper body provided on an outer surface of a bridge portion of the caliper body for the purpose of improving rigidity. Related to the reinforcing ribs.

[0002]

2. Description of the Related Art In a conventional general disc brake for a vehicle, a braking reaction force caused by sliding contact between a disc rotor and a friction pad pushes a working portion and a reaction portion of a caliper body back in a direction opposite to the disc, and a caliper body is formed. May open and deform in a C-shape with the bridge portion outside the disk rotor as a fulcrum, which may cause a decrease in braking force and the like. For example, a technique disclosed in Japanese Patent Application Laid-Open No. 62-270835 has been proposed. .

In this caliper body, a working portion having a piston inserted in a cylinder hole and a reaction portion having a reaction force claw are arranged on both sides of a disk rotor so as to oppose each other and straddle the outer periphery of the disk rotor. On the outer surface of the bridge part connecting the two parts, three reinforcing ribs parallel to the disk axis are provided so as to protrude, and the central reinforcing rib is formed thicker outward than the reinforcing ribs on both sides, so that the rigidity of the caliper , The deflection of the caliper due to the U-shaped deformation is suppressed, and at the time of casting, the gate is provided by using the center rib located at a higher position than the side ribs.

[0004]

However, in order to increase the rigidity of the caliper body, simply increasing the number and area of the reinforcing ribs or simply forming the bridge portion itself thicker increases the size of the caliper body. However, since the unsprung weight of the vehicle body increases to cause a decrease in ride comfort, and the material cost increases to increase the cost, it is desired to reduce the weight as much as possible while increasing the rigidity.

In such a caliper body, since the connecting portion between the operating portion and the bridge portion and the connecting portion between the reaction portion and the bridge portion are bent,
Stress due to braking reaction force concentrates. In particular, the connecting portion between the working portion and the bridge portion supports the weight of the piston and supplies the hydraulic fluid to the hydraulic chamber at the bottom of the cylinder hole, so that the connecting portion is thicker than the connecting portion between the reaction portion and the bridge portion. As a result, the elasticity of the inner and outer surfaces of the connecting part becomes poor, causing large distortion in the caliper body, and the hydraulic pressure is lost by the volume expansion of the hydraulic pressure chamber, and the operation feeling is reduced. descend.

Accordingly, the present invention secures a sufficient rigidity force to withstand a C-shape deformation at a connecting portion between a working portion where a large concentration of stress is concentrated and a bridge portion, and minimizes extra thickness increase in other portions. It is an object of the present invention to provide a caliper body of a disc brake for a vehicle that avoids the problem and maintains a good operation feeling while achieving a reduction in weight.

[0007]

According to the above-mentioned object, according to the present invention, an action portion having a piston inserted in a cylinder hole and a reaction portion having a reaction force claw are arranged on both sides of a disk rotor to face each other. A vehicle disk in which the working portion and the reaction portion are integrally connected to both ends of a bridge portion provided over the outer periphery of the disk rotor, and reinforcing ribs are provided on the outer surface of the bridge portion so as to protrude in the disk axial direction. In the caliper body of the brake, the reinforcing rib extends from the connecting portion between the operating portion and the bridge portion to the operating portion side, and the cross-sectional area of the reinforcing rib is gradually reduced toward the reaction portion side. Features.

The above-mentioned reinforcing rib has a maximum width in the circumferential direction of the disk at the end on the working portion side, and gradually decreases in width toward the disk rotor, or the outer end in the radial direction of the disk at the end on the working portion side. The maximum thickness is obtained, and the thickness is gradually reduced toward the disk rotor.

According to the structure of the present invention, the connecting portion between the one acting portion where the stress is most concentrated and the bridge portion is sufficiently reinforced by the portion having the maximum cross-sectional area of the reinforcing rib due to the braking reaction force from the friction pad. On the other hand, the caliper body is reduced in weight as much as possible by gradually reducing the cross-sectional area of the reinforcing rib as it goes away from the connecting portion between the action portion and the bridge portion and making the reinforcing rib the minimum necessary size. By securing rigidity at the connecting portion between the operating portion and the bridge portion as described above, the expansion of the hydraulic chamber is suppressed as much as possible, so that a good operation feeling is maintained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The disc brake 1 has a caliper bracket 3 fixed to the vehicle body at one side of a disc rotor 2 and a caliper body 4 supported by slide pins 5 and 6 so as to be movable in the disc axial direction.

The caliper bracket 3 has one slide pin 5 protruding from the disc retrieving side, and a caliper supporting arm 3a extending over the disc rotor 2 extending from the disc retrieving side, and is provided on the caliper supporting arm 3a. Is provided with a guide hole 3b and a pair of torque receiving steps 3c, 3c.

The caliper body 4 has a cylinder boss 4e.
A reaction portion 4a having bottomed cylinder holes 7, 7 arranged side by side in the disk circumferential direction, and a reaction portion 4b having three reaction force claws 4d also arranged side by side in the disk circumferential direction, on both sides of the disk rotor 2. A two-pot pin-sliding type, in which an action portion 4a and a reaction portion 4b are integrally connected to both ends of a bridge portion 4c which is disposed to face and which is disposed across the outer periphery of the disk rotor 2, and has a cylinder opening surface 4f. A connecting portion (hereinafter, referred to as a connecting portion on the operating portion) 4g of the operating portion 4a and the bridge portion 4c substantially positioned on the extension line L supports a weight of the cylinder boss portion 4e and a piston 8 described later. The connecting portion 4b and the bridge portion 4c are formed thicker than a connecting portion 4h (hereinafter, referred to as a reaction portion side connecting portion).

A cup-shaped piston 8 is inserted into each of the cylinder holes 7 and 7 via a square seal 9 so as to be fluid-tight and movable, and a hydraulic pressure is provided between the piston 8 and the bottom of the cylinder hole 7. A chamber 10 is defined, and a pair of friction pads 11, 11 are arranged between the piston 8 and the reaction force claw 4d so as to face each other with the disk rotor 2 interposed therebetween.

A union boss 4i and a bleeder boss 4j protrude from the center of the outer surface of the action portion 4a and from the disk outlet side. A union hole 12 is formed in the union boss 4i in both hydraulic chambers 10. The union hole 1
2, the hydraulic fluid pressurized by a separate hydraulic master cylinder (not shown) is supplied to the hydraulic chamber 10, and the bleeder boss 4j is provided with a bleeder screw 13 for discharging air mixed in the hydraulic fluid to the outside. It is screwed.

Body-mounting arms 4k and 4m are protrudingly provided at the center of the inner side of the action portion 4a and on the disk outlet side. The caliper body 4 has one slide pin 5 protruding from the caliper bracket 3 and The other slide pin 6 protruding from the vehicle body mounting arm 4k is inserted into the guide hole 14 of the mounting arm 4k via the elastic bush 15, and the caliper support arm 3a.
And is supported so as to be movable in the disk axial direction as described above.

Pad support arms 4n and 4o are protrudingly provided on the disk reciprocating side of the action portion 4a and the reaction portion 4b.
An arc-shaped rotor groove 19 having the same center as that of the disk rotor 2 is formed inside the bridge portion 4c so as to accommodate the disk rotor 2 and the friction pads 11 and 11, and the lining 16 is formed by a disk. The friction pads 11, 11 arranged toward the rotor are hung on the disk reciprocating side of the back plates 17, 17 by hanger pins 18 bridged over the pad support arms 4n, 4o. 17 and 17 are supported by the torque receiving steps 3c and 3c of the caliper support arm 3a, and are accommodated in the rotor groove 19 together with the disk rotor 2 and move in the disk axial direction similarly to the caliper body 4. Supported as possible.

On the outer surface of the caliper body 4, seven reinforcing ribs 4p, 4q, 4r, 4s, 4t, 4u, 4v are provided.
Are provided so as to protrude in the axial direction of the disk, so that the two-pot caliper body 4 long in the circumferential direction of the disk has a required rigidity. Of these, six reinforcing ribs 4p-4
u is formed as a ridge having a substantially rectangular cross section parallel to the disk axis, and the other reinforcing rib 4v is formed as a substantially triangular shape in plan view, and the two reinforcing ribs 4p and 4q are used as side ribs. At two ends of the caliper body 4 on the disk entrance side and the exit side, substantially over both outer ends of the action portion 4a and the reaction portion 4b, two other reinforcing ribs 4r and 4s and a triangular reinforcing rib 4v are provided. Are provided at the center of the caliper body 4 continuously as center ribs, and the remaining two reinforcing ribs 4t, 4t are provided.
u is disposed between the bleeder boss 4i at the center of the action portion 4a and both side ribs.

Reinforcing ribs 4r, 4 constituting center ribs
The triangular reinforcing ribs 4v are formed on the outer surface of the bridge portion 4c, and one reinforcing rib 4r is formed on the outer surface of the action portion 4a between the reinforcing rib 4v and the union boss portion 4i.
The other reinforcing ribs 4r are provided on the outer surface of b.

The reinforcing rib 4v has one end extending from the outer surface of the bridge portion 4c to the outer surface of the working portion 4a, beyond the extension line L of the cylinder opening surface 4f passing through the connecting portion 4g on the working portion side. The end extends from the outer surface of the bridge portion 4c to the outer surface of the reaction portion 4b beyond the connecting portion 4h on the reaction portion side, and further, at one end of the reinforcing rib 4v, a reinforcing rib 4t, which is intermediate in the disk circumferential direction, is provided. The maximum cross-sectional area of the reinforcing rib 4v is arranged near the connecting portion 4g on the working portion side by taking the length extending to the outer end of 4u, and the cross-sectional area of the reinforcing rib 4v is gradually reduced toward the reaction portion 4b. By the reinforcement rib 4
v is formed in a substantially triangular shape in plan view as described above.

As a result, in the connecting portion 4g on the side of the working portion where the stress is applied most by the braking reaction force from the friction pad 11, a necessary and sufficient rigidity is secured by one end of the reinforcing rib 4v having the maximum sectional area. You. In particular, one end of the reinforcing rib 4v is connected to the cylinder opening surface 4 where the connecting portion 4g on the working portion side is located.
Since the extension rib f reaches the action portion 4a beyond the extension line L, the rigid force at one end of the maximum cross-sectional area of the reinforcing rib 4v acts on the entire connection portion 4g on the action portion side.

Further, in a portion other than the connecting portion 4g on the working portion side that does not require much rigidity, the cross-sectional area of the reinforcing rib 4v gradually decreases as the distance from the connecting portion 4g on the working portion side decreases. The weight of the rib 4v can be minimized.

The disc brake 1 of the present embodiment is configured as described above, and the hydraulic fluid pressurized by the hydraulic master cylinder by the braking operation of the driver is supplied to both the hydraulic chambers 1.
When supplied to 0, each piston 8 advances in the cylinder hole 7 toward the disk rotor, and presses the friction pad 11 on the working portion side to one side surface of the disk rotor 2.

Next, the caliper body 4 moves in the direction of the acting portion while being guided by the slide pins 5 and 6 due to the above-mentioned reaction, and the reaction force claw 4d moves the friction pad 11 on the reaction portion side to the other side of the disk rotor 2. And a braking action is performed.

At the time of the above-described braking, a braking reaction force caused by sliding contact between the disk rotor 2 and the friction pads 11, 11 acts on the action portion 4a and the reaction portion 4b through the piston 8 and the reaction force claw 4d. And the reaction part 4b is pushed back in the direction opposite to the disk to deform the caliper body 4 around the bridge part 4c as a fulcrum. Since the necessary and sufficient rigidity is secured by the maximum cross-sectional area of 4v, distortion and deformation hardly occur, and the durability of the caliper body 4 can be improved. Also, by securing the necessary rigidity for the connecting portion 4g on the working portion side, the working portion 4g is secured.
a in the direction opposite to the disk is suppressed as much as possible.
Since the hydraulic pressure loss due to the expansion of 0 is kept small, a good operation feeling can be maintained.

Further, in a portion other than the connecting portion 4g on the action portion side, which does not require much rigidity, the cross-sectional area of the reinforcing rib 4v is
Since the weight of the reinforcing rib 4v, which gradually decreases as the distance from the connecting portion 4g on the action portion side and leads to the unsprung load is minimized, a comfortable ride can be maintained.

In the above-described embodiment, the length is taken in the circumferential direction of the disk in order to secure the maximum cross-sectional area at the end of the reinforcing rib on the working part side. May be formed in a thicker shape, and the thickness is gradually reduced toward the reaction portion.

The technical idea of the present invention is also applicable to a caliper body opposed to a piston. In this case,
A maximum cross-sectional area is taken at both ends of the reinforcing ribs extending to both working portions beyond the connecting portion on the working portion side, and the cross-sectional area gradually decreases toward the disk rotor.

[0028]

As described above, the caliper body of the disc brake for a vehicle according to the present invention includes a reinforcing rib in the axial direction of the disc provided to protrude on the outer surface of the bridge portion, and a connecting portion between the operating portion and the bridge portion. And extend to the working section side,
Since the cross-sectional area of the reinforcing rib is gradually reduced toward the reaction portion side, the connecting portion on the operation portion side which is most stressed by the braking reaction force from the friction pad needs to have the maximum cross-sectional area of the reinforcing rib. Since sufficient rigidity is secured, distortion and deformation hardly occur, and the durability of the caliper body can be improved. In addition, by securing the necessary rigidity at the connecting portion between the working portion and the bridge portion, deformation of the working portion in the direction opposite to the disk is suppressed as much as possible,
Since the hydraulic pressure loss due to the expansion of the hydraulic chamber is kept small,
Good operation feeling can be maintained.

Further, in a portion other than the connecting portion between the operating portion and the bridge portion, which does not require much rigidity, the cross-sectional area of the reinforcing rib is gradually reduced as the distance from the connecting portion between the operating portion and the bridge portion decreases. Further, since the weight of the reinforcing ribs that leads to the unsprung load is minimized, it is possible to maintain a comfortable ride without a sense of discomfort.

[Brief description of the drawings]

FIG. 1 is a plan view of a disc brake showing one embodiment of the present invention.

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

FIG. 3 is a sectional view taken along the line III-III of FIG. 2, showing one embodiment of the present invention;

FIG. 4 is a rear view of a disc brake showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 4 ... Caliper body 4a ... Working part 4b ... Reaction part 4c ... Bridge part 4f ... Cylinder opening surface 4g ... Connection part of connection part 4a and bridge part 4c (connection part on the working part side) 4h: connection part between reaction part 4b and bridge part 4c (connection part on reaction part side) 4p, 4q, 4r, 4s, 4t, 4u ... reinforcement rib 4v ... reinforcement rib (reinforcement rib of the present invention) 5, 6 ... Slide pin 7 ... Cylinder hole 8 ... Piston 10 ... Hydraulic pressure chamber 11 ... Friction pad 16 ... Lining 17 ... Back plate 18 ... Hanger pin L ... Extension line of cylinder opening surface 4f

Claims (1)

[Claims] 1. A bridge portion having a working portion having a piston inserted in a cylinder hole and a reaction portion having a reaction force claw opposing each other on both sides of a disk rotor, and being arranged over the outer periphery of the disk rotor. A caliper body of a disc brake for a vehicle, in which the operating portion and the reaction portion are integrally connected to both ends of the vehicle, and reinforcing ribs are provided on the outer surface of the bridge portion so as to protrude in the disk axial direction. A caliper body for a disc brake for a vehicle, wherein the caliper body extends from a connecting portion between the portion and the bridge portion to the action portion side, and a cross-sectional area of the reinforcing rib is gradually reduced toward the reaction portion side.