JP2003172383A - Pin slide type caliper body for vehicle disc brake - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a working part with a plurality of cylinder holes,
The reaction force claw of the reaction portion has the required rigidity without increasing the size of the caliper body. SOLUTION: A bottomed hole which penetrates a reaction force claw 4h and is opened in the action portion 4a toward the disk rotor is defined as a cylinder hole 10 on the disk re-entry side. A stepped through-hole penetrating the action portion 4a in the disk axis direction; I do. The opening 21 of the reaction claw 4h is only one on the disk recirculation side corresponding to the cylinder hole 10 using the bottomed hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle disc brake mounted on a vehicle such as a four-wheeled vehicle or a motorcycle. More specifically, the caliper body is guided in the disc axial direction by a slide pin. The present invention relates to a pin slide type caliper body.

[0002]

2. Description of the Related Art As a pin slide type caliper body for a vehicle disc brake, for example, Japanese Utility Model Publication No. 7-49085.
Japanese Patent Publication No. 911886 and registered design No. 911886. These caliper bodies are provided with a plurality of cylinder holes in the action portion arranged on one side of the disc rotor, and reaction force claws on the reaction portion arranged on the other side of the disc rotor. During casting of the body, a bottomed hole, which is a lower hole of the cylinder hole, is provided in the action part by opening it to the disc rotor side, and the reaction force claw has an opening for pulling out the core for the bottomed hole. After forming the through hole in the axial direction and after forming the caliper body, a cutting tool is inserted into the bottomed hole from the opening of the reaction claw to finish the bottomed hole into a cylinder hole with a required accuracy.

[0003]

As described above, it is necessary to provide the reaction claws of the reaction portion with openings corresponding to the cylinder holes of the reaction portion, and as the number of the cylinder holes increases, the reaction claws of the reaction force claws increase. Since the cut-out area also increases and the reaction claw is divided into a plurality of small pieces, the rigidity of the reaction claw may be reduced, and the braking performance may not be sufficiently exhibited.

As a countermeasure against this, in the above-mentioned prior art, the wall thickness of the divided reaction force claw is extended in the direction opposite to the disc to secure the rigidity force as much as possible. Increasing the length in the axial direction of the disk is unavoidable, and such measures are limited due to the limitation of the vehicle body mounting space.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reaction force of a reaction portion without enlarging the caliper body even though the action portion has a plurality of cylinder holes. An object of the present invention is to provide a pin slide type caliper body for a vehicle disc brake, which allows the pawl to have a required rigidity.

[0006]

According to the first aspect of the present invention, in accordance with the above-mentioned object, an action portion arranged on one side portion of the disk rotor and a reaction portion arranged on the other side portion of the disk rotor. Are integrally connected to each other by a bridge portion arranged over the outer circumference of the disc rotor, and a caliper bracket fixed to the vehicle body at one side portion of the disc rotor is provided with a slide pin in the disc axial direction. Two cylinder holes that are movably supported and that are open to the disk rotor side are arranged in parallel in the disk circumferential direction in the action portion, and a hydraulic chamber is defined at the bottom of each cylinder hole. In a pin slide type caliper body of a vehicle disc brake in which a reaction force pawl is provided on the reaction portion, the cylinder hole is formed in the action portion by penetrating the reaction force pawl from the reaction portion side. A bottomed hole, is characterized by being configured the acting portion penetrating in the disk axial direction, and in the through-hole to be occluded anti disc rotor side at the closure member.

According to a second aspect of the present invention, in the first aspect of the invention, a cylinder hole using a bottomed hole is provided on the disk advancing side, and a cylinder hole using a through hole is on the disk advancing side. Arrange. According to a third aspect of the invention, in the first aspect of the invention, the cylinder hole using the through hole and the cylinder hole using the bottomed hole are alternately arranged. According to the invention of claim 4,
In the invention of claim 1, a plurality of cylinder holes using through holes and a plurality of cylinder holes using bottomed holes are arranged in parallel.

Furthermore, in the invention of claim 5, in the invention of claim 1, cylinder holes using through holes are arranged on both sides in the disk circumferential direction, and the bottomed holes are used between the cylinder holes. Provide a cylinder hole. In the invention of claim 6, in the invention of claim 5, the cylinder hole using the through hole is used for the first brake system, and the cylinder hole using the bottomed hole is used for the second brake system. Through holes are formed on the side opposite to the disk rotor, and the tips of the through holes are connected to each other to form a communication hole for communicating the hydraulic chamber for the first brake system.

According to the first to sixth aspects of the present invention, of the reaction claws set in the reaction portion, the portion facing the cylinder hole using the bottomed hole has a core during molding or during cutting. Although the through hole is opened for the tool to pass through, the portion of the through hole that faces the cylinder hole is left as a muffler, and the reaction force claw has a rigid force.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the first embodiment of the present invention.
FIG. 1 is a sectional plan view of a disc brake,
FIG. 2 is a front view of the same.

In the disc brake 1 of the first embodiment, a caliper bracket 3 fixed to the vehicle body at one side of a disc rotor 2 rotating in the direction of arrow A has a caliper body 4 as a pair of sliding pins 5, 6. Is supported so as to be slidable in the disc axial direction via the action part 4 of the caliper body 4.
A pair of friction pads 7 and 7 are provided between a and the reaction portion 4b.
Are opposed to each other with the disc rotor 2 interposed therebetween.

The caliper body 4 is attached to the acting portion 4a.
A two-pot pin slide type in which two cylinder holes 10 and 11 are arranged side by side in the disk circumferential direction, and an action portion 4a and a reaction portion 4b arranged on both sides of the disc rotor 2 straddle the outer circumference of the disc rotor 2. It is configured to be connected by a bridge portion 4c. Mounting arms 4d and 4e are provided on the action portion 4a so as to project inward in the disc radial direction and toward the disc shunting side, and guide arms 4f and 4g are provided on the action portion 4a and the reaction portion 4b at the disc entry side. In addition, the reaction portion 4b is provided with a reaction force claw 4h, and the caliper body 4 inserts the sliding pins 5 and 6 projecting from the caliper bracket 3 toward the disc axial direction into the mounting arms 4d and 4e. And is supported so as to be movable in the disc axial direction.

Each friction pad 7 is constructed by joining a lining 7a, which is in sliding contact with the side surface of the disc rotor 2, to a metal back plate 7b. Insert the hanger pin 12 that is placed horizontally,
The disc feeding side of the back plate 7b is held by a caliper bracket 3 and a cap nut 13 screwed to the caliper bracket 3 and is movably suspended in the disc axial direction.

The cylinder holes 10 and 11 are formed in a bottomed cylindrical shape with the disk rotor side opened, and cup-shaped pistons 14 and 15 are inserted in the cylinder holes 10 and 11 so as to be liquid-tight and movable. Hydraulic chamber 1 at the bottom of 10, 11
6 and 17 are defined. The hydraulic chambers 16 and 17 communicate with each other through a communication hole (not shown), and when the driver performs a braking operation, the hydraulic fluid boosted by a separate hydraulic master cylinder passes through the communication holes to the hydraulic chambers 16 and 17. Supplied and piston 1
4, 15 are pushed toward the disk rotor of the cylinder holes 10, 11 to press the friction pad 7 on the acting portion 4a side to one side surface of the disk rotor 2. Next, due to this reaction, the caliper body 4 moves in the direction of the action portion 4a while being guided by the sliding pins 5 and 6, and the reaction force claw 4h of the reaction portion 4b.
However, the other friction pad 7 is pressed against the other side surface of the disc rotor 2 to perform the braking action.

The caliper body 4 is cast and formed using a metal material such as an aluminum alloy or cast iron, and at the time of this casting and forming, the bottom portion of the cylinder hole 10 is a bottom hole of the cylinder hole 10 on the disc entry side of the action portion 4a. A hole is formed, and a through hole serving as a lower hole of the cylinder hole 11 is formed on the disc extension side of the action portion 4a. The bottomed hole on the disc entry side is provided so as to open to the disc rotor side, and the through hole on the disc entry side has a small diameter portion 20a on the disc rotor side and a large diameter portion 20b on the non-disc rotor side. It is formed in steps.

A core is used for forming the bottomed hole and the through hole, respectively. In the bottomed hole for the cylinder hole 10, the core is pulled out to the disk rotor side, so that the reaction force claw 4h is inserted to the disk entry side. An opening 21 for pulling out the core penetrates in the disk axial direction and opens inward in the disk radial direction. In addition, in the stepped through hole for the cylinder hole 11, the core is pulled out to the side opposite to the disk rotor of the action portion 4a, so that there is no opening like the disk inflow side on the disk outflow side of the reaction force claw 4h. Instead, the claw shape is maintained as is.

After the caliper body 4 is cast-molded in this manner, the cutting tool is located on the side opposite to the disk rotor of the reaction force claw 4h on the disk entry side, and the cutting tool is moved in the direction of the disk rotor. The opening 21 is cut to a required size for finishing, and further, a cutting tool is inserted into the bottomed hole of the action portion 4a and cut to a predetermined depth to finish to a required dimensional accuracy to obtain the cylinder hole 10.

On the other hand, on the disc feeding side of the caliper body 4, the cutting tool is positioned on the side opposite to the disc rotor of the operating portion 4a, and the cutting tool is moved in the disc rotor direction,
The small-diameter portion 20a and the large-diameter portion 20b of the through hole are finished to the required dimensional accuracy. Then, a female screw is engraved on the finished large-diameter portion 20b, and the closing member 22 is screwed to the female screw, and the large-diameter portion 2 is formed by the closing member 22 and the sealing material 23.
By closing 0b in a liquid-tight manner, the small-diameter portion 20 of the through hole is closed.
The bottomed cylinder hole 11 opening to the disk rotor 2 side is formed by a and the closing member 22.

As described above, in this embodiment, a stepped through-hole is formed in the disc extension side of the operating portion 4a of the caliper body 4 in the axial direction of the disc from the side opposite to the disc rotor. Because the cylinder hole 11 is formed by closing the rotor side with the closing member 22, the reaction force claw 4h of the reaction portion 4b does not have an opening like the disk insertion side on the disk feeding side, and the claw shape is the original meat. It remains thick.

As a result, the reaction claw 4h can be prevented from being reduced into small pieces as in the conventional case, a required rigidity force as a pad pressing force can be secured in the entire reaction claw 4h, and the braking performance set for the disc brake 1 can be ensured. Will be able to fully demonstrate. Further, since the reaction force claw 4h secures the rigidity without thickening in the direction opposite to the disc rotor in this manner, the caliper body 4 is lightweight and compact by suppressing the length in the disc axial direction. In addition, it can be easily installed even in a narrow space of the vehicle body.

Furthermore, on the disc turn-in side of the caliper body 4, a so-called leading action is generated in which the linings 7a, 7a of the friction pads 7, 7 are wound around the disc rotor 2, so that the disc turn-in side of the linings 7a, 7a is more than the turn-out side. Also causes the problem of early wear, but the reaction force claw 4
In the present embodiment example in which the opening 21 is provided on the disc entry side of h, the pad pressing force on the disc entry side by the reaction force claw 4h is suppressed, so that uneven wear of the linings 7a, 7a can be prevented as much as possible.

3 and 4 show a second embodiment of the present invention. FIG. 3 is a sectional plan view of the disc brake, and FIG. 4 is a front view thereof. The same components as those in the first embodiment described above are designated by the same reference numerals and detailed description thereof will be omitted.

Caliper body 3 of the disc brake 30
1 includes an action portion 31a, a reaction portion 31b, and a bridge portion 31c. Three cylinder holes 32, 32, and 33 are provided in the action portion 31a side by side in the disk circumferential direction. A three-pot two-system pin slide in which the cylinder holes 32, 32 located at and are not for the first brake system, and the cylinder hole 33 sandwiched between the cylinder holes 32, 32 is for the second brake system. A mold is used, and the disc brake 30 operates on either one or both of the first and second brake systems.

In the caliper bracket 34 disposed on one side of the disc rotor 2, the caliper support arm 34a is disposed on the disc shunting side of the caliper body 31 so as to straddle the outside of the disc rotor 2 toward the reaction portion. The sliding pin 35, which is provided on the side of the caliper body 31 on which the disc is extended, is slidably inserted into the pin hole 36 of the caliper support arm 34a, and the torque receiving portion 34b of the caliper support arm 34a,
34b holds the disc feed-out side of the back plates 7b, 7b of the friction pads 7, 7.

Cylinder holes 32 on both sides in the disk circumferential direction,
The reference numeral 32 liquid-tightly closes a stepped through-hole penetrating the action portion 31a in the disc axial direction and a large-diameter hole 20b located on the side opposite to the disc rotor of the through-hole with a closing member 22 and a sealing member 23. It is formed deep. A piston 37 is fluid-tightly and movably inserted into the small-diameter portion 20a of each cylinder hole 32, and the first brake is defined between the piston 37 and the closing member 22 serving as the bottom wall of the cylinder hole 32. The hydraulic chambers 38, 38 for the system are communicated with each other through a communication hole 39.

For the cylinder hole 33 at the intermediate portion in the disk circumferential direction, a shallow bottomed hole formed by penetrating the reaction force claw 31d from the reaction portion 31b side and opening the disk rotor side to the action portion 31a is used. Has been. A piston 40 is inserted in the cylinder hole 33 so as to be liquid-tight and movable.
0 and a thick bottom wall 31e left on the side opposite to the disc rotor of the cylinder hole 33, a hydraulic chamber 41 for the second brake system is defined, and the above-mentioned communication hole is formed in the bottom wall 31e. 39 is provided in parallel with the side surface of the disc rotor 2.

The caliper body 31 of the present embodiment is provided with three cylinder holes 32, 32, 33 in the acting portion 31a, but the cylinder holes 32, 32 on both sides in the disk circumferential direction are
A cylinder hole 3 is formed in the acting portion 31b by using a through hole penetrating in the disc axial direction, and is formed in the middle portion of the disc circumferential direction.
3 is formed by a bottomed hole that opens to the disk rotor 2 side, the reaction force claw 31d has a cylinder hole 3 in the middle portion.
Only the opening 42 for forming 3 is opened inward in the disk radial direction while penetrating in the disk axial direction, and the claw shape is left as it is on both sides in the disk circumferential direction. As a result, the reaction force claw 31d is prevented from becoming small, and the reaction force claw 31d is suppressed.
A required rigidity can be secured for the entire area d, and the braking performance set for the disc brake 30 can be sufficiently exhibited.

Next, the third to fifth examples of the present invention will be described with reference to FIGS.
It will be described with reference to FIG. 5 is a sectional plan view of a disc brake showing a third embodiment of the present invention, and FIG. 6 is a sectional plan view of a disc brake showing a fourth embodiment of the present invention.
FIG. 7 is a sectional plan view of a disc brake showing a fifth embodiment of the present invention. The same components as those of the first and second embodiments described above are designated by the same reference numerals, and detailed description thereof will be omitted.

In the caliper body 51 of the disc brake 50 shown in the third embodiment of FIG. 5, cylinder holes 52, 52 using bottomed holes are provided on the action side 51a on the disc entry side, and through holes are provided. A 4-spot 2-system pin slide type in which the used cylinder holes 53, 53 are arranged side by side on the disc feeding side is used.

Two cylinder holes 52 on the disk entry side,
A shallow bottomed hole formed by penetrating the reaction force claw 51c from the reaction portion 51b side and opening the disk rotor side in the action portion 51a is used as the piston 52.
4, the hydraulic chambers 55, 55, and the communication hole 56 are used for the first brake system.

Further, the two cylinder holes 53, 53 on the disc shunting side are a stepped through hole penetrating the action portion 51a in the disc axial direction and a large diameter hole located on the disc rotor side opposite to the through hole. 20 b is liquid-tightly closed by a closing member 22 and a sealing material 23, and the closing member 22 is combined with the small diameter portion 20 a of the through hole located on the side of the disk rotor so that it is deeper than the cylinder holes 52, 52 on the disk entry side. Pistons 57, 57, hydraulic chambers 58, 58, and communication holes 5 formed on the bottom.
9 together with the second brake system.

The reaction claw 51c of the reaction portion 51b has two openings 60 penetrating in the disc axial direction and opening inward in the disc radial direction on the disc entry side of the action portion 51a facing the cylinder holes 52, 52. , 60 are provided. The claw shape is left as it is on the disk feeding side facing the cylinder holes 53, 53, so that the entire reaction claw 51c has a required rigidity.

Further, in the present embodiment, the openings 60, 60 are arranged on the disc entry side of the reaction force claw 51c, so that the leading action can be suppressed and the uneven wear of the linings 7a, 7a can be prevented as much as possible.

FIG. 6 is a fourth form example showing a modification of the third form example, and shows the caliper body 7 of the disc brake 70.
In No. 1, shallow cylinder holes 52 and 52 using bottomed holes are arranged on the inner side in the disk circumferential direction, and deep cylinder holes 53 and 53 using through holes are arranged on the outer side in the disk circumferential direction. It is a two-spot type pin slide type pot.

The reaction claw 51c of the reaction portion 51b has openings 60, 60 at positions corresponding to the shallow cylinder holes 52, 52.
Is provided, and the claw shape is left as it is at the positions corresponding to the deep cylinder holes 53, 53, so that the reaction force claw 51c as a whole secures a required rigidity.

FIG. 7 is a fifth form example showing another modification of the third form example. The caliper body 81 of the disc brake 80 has two types of cylinder holes 5 used in the third form example.
A 4-spot 2-system pin slide type in which 2 and 2 of 2 and 53 are alternately arranged is used.

The reaction claw 51c of the reaction portion 51b has openings 60, 60 at positions corresponding to the shallow cylinder holes 52, 52.
Is provided, and the claw shape is left as it is at the positions corresponding to the deep cylinder holes 53, 53, so that the reaction force claw 51c as a whole has a required rigidity.

In the present invention, at least one bottomed hole formed by penetrating the reaction claw from the reaction portion side and at least one through hole penetrating the action portion in the disc axial direction may be used.
The number and layout of cylinder holes are arbitrary.
The depths of the bottomed holes and the through holes and the number of brake systems are not limited to those in the above-described embodiment.

[0039]

As described above, according to the caliper body of the vehicle disc brake of the present invention, it is possible to prevent the reaction force claws of the reaction portion from becoming small, and the reaction force claws have a through hole. Since the claw shape is left as it is in the portion corresponding to the hole, the required rigidity as pad pressing force is secured in the entire reaction claw, so that the braking performance set for the disc brake can be fully exhibited. become. In addition, since the reaction force pawl secures rigidity without increasing the thickness in the direction opposite to the disc rotor, the caliper body can be made lightweight and compact by suppressing the length in the disc axial direction. It can be easily installed even in a narrow space of the vehicle body.

[Brief description of drawings]

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

2 is a front view of FIG.

FIG. 3 is a sectional plan view of a disc brake showing a second embodiment example of the present invention.

FIG. 4 is a front view of FIG.

FIG. 5 is a sectional plan view of a disc brake showing a third embodiment of the present invention.

FIG. 6 is a sectional plan view of a disc brake showing a fourth embodiment of the present invention.

FIG. 7 is a sectional plan view of a disc brake showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4 ... Caliper body, 4a, 31a ...
Action part, 4b, 31b ... Reaction part, 4h ... Reaction force claw, 5,
6 ... Sliding pin, 7 ... Friction pad, 7a ... Lining, 7
b ... back plate, 10, 11 ... cylinder hole, 14, 15 ... piston, 16, 17 ... hydraulic chamber, 20a ... large diameter part, 20b ...
Small diameter part, 21 ... Opening, 22 ... Closing member, 23 ... Sealing material, 30 ... Disc brake, 31 ... Disc rotor,
31a ... acting part, 31b ... reaction part, 31d ... reaction force claw,
31e ... Bottom wall, 32, 33 ... Cylinder hole, 34 ... Caliper bracket, 37, 40 ... Piston, 38, 41 ... Hydraulic chamber, 39 ... Communication hole, 42 store opening, 50 ... Disc brake, 51 ... Caliper body, 51a ... acting part, 51b
... Reaction part, 51c ... Reaction force claw, 52, 53 ... Cylinder hole, 54, 57 ... Piston, 55, 58 ... Hydraulic chamber, 5
6, 59 ... Communication hole, 60 ... Opening, 70 ... Disc brake, 71 ... Caliper body, 80 ... Disc brake,
81 ... Caliper body, A ... Rotation direction of disc rotor 2

Claims (6)

[Claims] 1. A bridge portion disposed across the outer periphery of the disc rotor, the action portion disposed on one side portion of the disc rotor and the reaction portion disposed on the other side portion of the disc rotor. A caliper bracket fixed to the vehicle body at one side of the disc rotor is integrally movably supported by a caliper bracket so as to be movable in the disc axial direction, and the acting portion has a disc rotor side. Pin slides for a vehicle disc brake, in which two or more cylinder holes opening to each other are arranged side by side in the disc circumferential direction, a hydraulic chamber is defined at the bottom of each cylinder hole, and a reaction force pawl is provided in the reaction portion. In the type caliper body, the cylinder hole is
A bottomed hole that is formed in the action portion by penetrating the reaction force claw from the reaction portion side, and a through hole that penetrates the action portion in the disc axial direction and that is opposite the disc rotor side with a closing member. A pin slide type caliper body for a vehicle disc brake, which is characterized by being formed with a hole. 2. The cylinder hole using the bottomed hole is arranged on the disk advancing side, and the cylinder hole using the through hole is arranged on the disk advancing side. Pin slide type caliper body of the vehicle disc brake described. 3. The pin slide type of the vehicle disc brake according to claim 1, wherein the cylinder hole using the through hole and the cylinder hole using the bottomed hole are alternately arranged. Caliper body. 4. The vehicle disc brake according to claim 1, wherein a plurality of cylinder holes using the through holes and a plurality of cylinder holes using the bottomed holes are arranged in parallel. Pin slide type caliper body. 5. A cylinder hole using the through hole is provided on both sides in the disk circumferential direction, and a cylinder hole using the bottomed hole is provided between the cylinder holes. The pin slide type caliper body of the vehicle disc brake described in 1. 6. The cylinder hole using the through hole is used for the first brake system, the cylinder hole using the bottomed hole is used for the second brake system, and each of the through holes is on the side opposite to the disk rotor. 6. A disc brake for a vehicle according to claim 5, wherein a through hole is provided, and the leading ends of the through holes are connected to each other to form a communication hole for communicating the hydraulic chamber for the first brake system. Pin slide type caliper body.