JP2003254361A - Caliper body of disc brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart required rigidity to a reaction portion without enlarging a caliper body, while a working portion have a plurality of cylinder holes. <P>SOLUTION: A bottom plate 4k is disposed on a side opposite to a disc rotor of reaction claws 4i, 4j that are adjacent to each other with sandwiching a machining hole 13 between them to block the side opposite to the disc rotor of the machining hole 13 by the bottom plate 4k. Distance L2 between the bottom plate 4k and a side face 4m of the disc rotor of the working portion 4a is set to be longer than the length L1 in an axial direction of the piston 16. An opening 19 in/from which the piston 16 is inserted and removed is disposed between the reaction claws 4i, 4j. <P>COPYRIGHT: (C)2003,JPO

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 in a vehicle such as a four-wheeled vehicle or a motorcycle, and more specifically, a plurality of disc brakes are provided in an action portion arranged on one side of a disc rotor. The present invention relates to a multi-pot caliper body having a cylinder hole.

[0002]

2. Description of the Related Art As prior art of vehicle disk brakes, for example, Japanese Utility Model Publication No. 7-49085 and Registered Design No. 9 are available.
There is one disclosed in Japanese Patent No. 11886. The caliper body used for these disc brakes has a plurality of bottomed cylinder holes, which open to the disc rotor side, arranged side by side in the disc circumferential direction in an action portion arranged on one side of the disc rotor. The reaction portion arranged on the other side portion is provided with reaction force claws and processing holes alternately in the disk circumferential direction. Each machined hole faces the cylinder hole on the side of the action part, and in addition to pulling out the core with the cylinder hole formed after casting the caliper body from the process hole to the side of the reaction part, I am trying to attach a piston.

[0003]

As described above, since it is necessary to provide a processing hole in the reaction portion in correspondence with the cylinder hole of the operation portion, the reaction force claw is divided into small pieces by the processing hole, and the pad pressing force is reduced. The area is reduced. Since the reduction of the pad pressing area of the reaction claw leads to the reduction of the rigidity and the pad pressing force of the reaction claw, in the aforementioned prior art, the wall thickness of the divided reaction claw is extended in the anti-disc direction. Although this is compensated, in this case, the length of the caliper body in the disc axial direction increases, and such measures are limited due to the restriction of the vehicle body mounting space.

The present invention has been made in view of such circumstances, and an object of the present invention is to increase the size of a caliper body even though the reaction force claws of the reaction portion are divided into a plurality of holes by the processing holes. An object of the present invention is to provide a caliper body for a vehicle disc brake, which allows a reaction portion to have a required rigidity and a pad pressing force.

[0005]

According to the above-mentioned object, the invention of claim 1 has 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. And are integrally connected to each other by a bridge portion arranged over the outer circumference of the disk rotor, and a plurality of bottomed cylinder holes opening to the disk rotor side are arranged in parallel in the disk circumferential direction in the action portion, A piston is inserted into each cylinder hole to define a hydraulic chamber on the bottom side of each cylinder hole, and a machining hole is provided in the reaction portion at a position facing the cylinder hole so as to penetrate therethrough in the disc axial direction. In a pin slide type caliper body of a vehicle disc brake in which reaction force pawls are disposed on both sides of the processing hole in the disc circumferential direction, a bottom plate is provided on a side opposite to the disc rotor of a pair of reaction force pawls adjacent to each other with the processing hole interposed therebetween. Erected, The counter disk rotor of the processing hole between the pair of reaction force claws is closed by a bottom plate, and the distance between the bottom plate and the disk rotor side surface of the acting portion is set longer than the axial length of the piston. An opening is provided between the reaction force claws so that the piston can be inserted and removed.

In the invention of claim 2, the bottom plate of claim 1 is applied to the processed hole on the disc entry side. In the invention of claim 3, the bottom plate of claim 1 is arranged every other hole in the processed hole. In the invention of claim 4, the bottom plate of claim 1 is continuously provided in a plurality of adjacent processing holes. In the invention of claim 5, three or more sets of the cylinder hole and the machining hole of claim 1 are arranged, the intermediate machining hole is closed by the bottom plate, and the intermediate cylinder hole facing the bottom plate is provided on both sides of the cylinder. It is formed shallower than the hole, and the intermediate cylinder hole is used for the first brake system, and the hydraulic chambers of the cylinder holes on both sides are communicated with each other for the second brake system.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a sectional plan view of FIG. 2, FIG. 2 is a front view of a disc brake, and FIG. 3 is a sectional view taken along line III-III of FIG.

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 a two-pot pin slide type in which bottomed cylinder holes 10 and 11 are arranged side by side in the disk circumferential direction on the operating part 4a, and the operating parts 4a are arranged on both sides of the disk rotor 2. And the reaction portion 4b are connected by a bridge portion 4c that straddles the outer circumference of the disc rotor 2.

Mounting arms 4d and 4e are provided on the action portion 4a so as to project inward in the radial direction of the disc and toward the disc unloading side, and guide arms 4f and 4g are provided on the disc entry side of the action portion 4a and the reaction portion 4b. It is projected and has a caliper body 4
The slide pins 5 and 6 projecting from the caliper bracket 3 in the disc axial direction are inserted into the mounting arms 4d and 4e and supported so as to be movable in the disc axial direction. The reaction portion 4b is provided with machined holes 12 and 13 facing the cylinder holes 10 and 11, respectively.
Three reaction force claws 4h, 4i, 4j are provided between 2 and 13 in a divided manner.

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, and the disc entry side of the back plate 7b is
It is suspended by the hanger pin 12 which is horizontally mounted on the guide arms 4f and 4g, and the disc feeding side of the back plate 7b is held by the caliper bracket 3 and the cap nut 14 attached to the disc, and the disc axial direction Is movably supported by.

The cylinder holes 10 and 11 are formed in a bottomed cylindrical shape with the disc rotor side opened, and cup-shaped pistons 15 and 16 are inserted in the cylinder holes 10 and 11 so as to be liquid-tight and movable. Hydraulic chamber 1 on the bottom side of 10, 11
7 and 18 are defined. The hydraulic chambers 17 and 18 are supplied with hydraulic fluid whose pressure is increased by a separate hydraulic master cylinder, and push the pistons 15 and 16 toward the disk rotors of the cylinder holes 10 and 11 to cause friction on the action portion 4a side. The pad 7 is pressed against one side surface of the disc rotor 2. Next, the caliper body 4 moves toward the action portion 4a while being guided by the sliding pins 5 and 6 by the reaction, and the reaction force claw 4 of the reaction portion 4b is moved.
h presses the other friction pad 7 against the other side surface of the disc rotor 2, and a braking action is performed.

The machined holes 12 and 13 of the reaction portion 4b are used for machining the cylinder holes 10 and 11 of the reaction portion 4a and for inserting and removing the pistons 15 and 16 therein. The machining hole 13 faces the cylinder hole 10 and the machining hole 13 faces the cylinder hole 11 on the disc feeding side. Reaction force claws 4h, 4i, 4j are located on both sides of the machining holes 12, 13 in the disc circumferential direction. ing.

Between the reaction force claws 4h, 4i, and 4j, the inner diameters of the opposing cylinder holes 10 and 11 are set to be equal to or wider than the inner diameters, respectively.
The machining hole 12 on the disc turn-in side sandwiched by 4i penetrates in the disc axial direction, and is open to the inner side in the disc radial direction with a size equal to or wider than the inner diameter of the cylinder hole 10.

A bottom plate 4k is erected on the side opposite to the disk rotors of the reaction force pawls 4i and 4j, and a machining hole 13 on the disc feeding side is sandwiched between the reaction force pawls 4i and 4j by the bottom plate 4k. The anti-disc rotor is closed by this bottom plate 4k to form a bottomed hole. An opening 19 is formed on the inner side of the machining hole 13 in the radial direction of the disc, and is formed to be the same as or wider than the inner diameter of the cylinder hole 11, and the piston 19 is provided between the bottom plate 4k and the disc rotor side surface 4m of the action portion 4a. An interval L2 longer than the axial length L1 of 16 is set.

The caliper body 4 is cast and formed using a metal material such as an aluminum alloy or cast iron, and a core is used to form the cylinder holes 10 and 11 of the working portion 4a. These cores are used in the cylinder hole 1 when filling the molten metal.
The cores, which are located at positions 0 and 11, after the caliper body 4 is cast and molded, and then the cylinder hole 10 on the disk entry side is molded, are pulled out through the processing hole 12 to the side opposite to the disk rotor side or the disk radial direction inner side.

On the other hand, in the core in which the cylinder hole 11 on the disc feeding side is formed, the side opposite to the disc rotor of the machining hole 13 is covered with the bottom plate 4k, so that the core is drawn through the machining hole 13 and the opening 19 inward in the radial direction of the disc. . Therefore, the distance L2 between the bottom plate 4k and the disk rotor side surface 4m is set to be equal to or longer than the depth D1 of the cylinder hole 11 on the disk feeding side.

Further, the piston 15 on the disk entry side is
The machining hole 12 is inserted / removed into / from the cylinder hole 10 through the disc rotor side or the disc radial direction inner side, and the piston 16 on the disc sprouting side is inserted / removed in the cylinder hole 11 through the machining hole 13 and the opening 19.

The disc brake 1 of this embodiment is constructed as described above, and the reaction portion 4 of the caliper body 4 is formed.
In b, the reaction force claws 4h and 4i between the disc entry side and the intermediate side are separated, whereas the reaction force claws 4 on the middle side and the disc ejection side are separated.
The i and 4j are integrally connected by the bottom plate 4k to enhance the rigidity, and the pad pressing force from the reaction force claws 4h to 4j is the same as the conventional reading on the disc entry side where the reading action is likely to occur. It is set higher than the conventional one on the disc feeding side where it is hard to produce the action.

In this way, although there is a difference in the pad pressing force between the disc entry side and the entry side of the reaction portion 4b,
A required pad pressing force is ensured as a whole of the reaction portion 4b, and on the disc entry side, a braking action is performed while preventing uneven wear of the lining 7a due to the leading action by the low pad pressing force as much as possible, and the leading action is generated. On the disc feeding side, which is difficult to do, braking action is performed with a high pad pressing force.

Therefore, according to this embodiment, the reaction force claw of the reaction portion 4b is divided into three by the processing holes 12 and 13 used for forming the cylinder holes 10 and 11 and inserting and removing the pistons 15 and 16. Despite this, the reaction force claws 4i, 4
Since the bottom plate 4k installed on the j secures the required pad pressing force on the reaction portion 4b, not only the caliper body 4 can be formed lightweight and compact without increasing in the axial direction of the disk, but also easily installed in a narrow vehicle mounting space. Can be attached to.

Next, second to fourth mode examples of the present invention will be described with reference to FIGS. 4 to 6. 4 is a sectional plan view of the disc brake showing the second embodiment, FIG. 5 is a sectional plan view of the disc brake showing the third embodiment, and FIG.
It is a cross-sectional plan view of a disc brake showing a form example. It should be noted that the same reference numerals are given to the constituent parts common to these embodiment examples including the above-described first embodiment example, and detailed description thereof will be omitted.

In the caliper body 21 of the disc brake 20 shown in the second embodiment of FIG. 4, the action portion 21a and the reaction portion 21b are connected by a bridge portion (not shown), and the action portion 2
Among the bottomed cylinder holes 22, 22 and 23 formed in 1a, the hydraulic chambers 24 and 24 of the deep cylinder holes 22 and 22 located on the disk entry side and the ejection side are defined by the liquid passage holes 25. A three-pot two-system pin slide type is used in which the hydraulic chamber 26 of the cylinder hole 23 at the center, which is located at the center, is used for the second brake system.

The disc brake 20 operates the caliper body 21 in the disc axial direction by operating one or both of the first and second brake systems, and the pistons 30, 30 and / or the piston 31 and the reaction force claw 21c. ，
The friction pads 7 and 7 are pushed toward the disk rotor by 21d, 21e and 21f, and the linings 7a and 7a are brought into sliding contact with both side surfaces of the disk rotor 2 to perform a braking action.

The reaction portion 21b has three machined holes 32,
32 and 33 are juxtaposed in the axial direction of the disk, the machined holes 32 and 32 face the deep-bottomed cylinder holes 22 and 22, and the machined hole 33 faces the shallow-bottomed cylinder hole 23. 4 on both sides of the disk circumferential direction of 32, 32, 33
The two reaction force claws 21c to 21f are located.

Reaction force claws 2 adjacent to each other in the center of the reaction portion 21b
A bottom plate 21g is installed on the side opposite to the disk rotors 1d and 21e, and a central processing hole 33 sandwiched by both reaction force claws 21d and 21e is a bottomed hole covered by the bottom plate 21g.
The processed holes 32, 32 located on the disk entry and exit sides are left penetrating in the disk axial direction.

Inside the processed hole 33 in the radial direction of the disk,
An opening 34 having the same inner diameter as or wider than the inner diameter of the cylinder hole 23 facing each other is formed.
An interval L4 longer than the axial length L3 of the piston 31 and equal to or longer than the depth D2 of the cylinder hole 23 is set between g and the disc rotor side surface 21h of the acting portion 21a. The piston 31 can be inserted into and removed from the cylinder hole 23 through the opening 34 and the processed hole 33.

In the disc brake 20 of this embodiment, the pad pressing force on the reaction portion 21b side is the reaction force claws 21d,
Since the bottom plate 21g is provided so as to be spaced apart from the base plate 21e, the height is made as uniform as possible, so that the required braking force can be obtained by operating one or both of the two brake systems while keeping the entire disc brake lightweight and compact. You will be able to fully demonstrate it.

In the caliper body 41 of the disc brake 40 shown in the third embodiment of FIG. 5, two shallow cylinder holes 42 and two deep cylinder holes 43 are alternately arranged in the action portion 41a in the circumferential direction of the disc. Installed, shallow cylinder holes 42, 42
The hydraulic chambers 44, 44 of the deep cylinder cylinders 43, 43 are communicated with the hydraulic chambers 44, 44 of
A 6-pot, 2-system pin slide type is used in which 6, 6 and 46 are communicated with each other through a fluid passage 47 for a second brake system.

The disc brake 40 operates the caliper body 41 in the disc axial direction by operating one or both of the first and second brake systems, so that the action portion 4
1a pistons 50, 50 and / or pistons 51,
51 and the reaction force claws 41c, 41d, 41 of the reaction portion 41b
The friction pads 7 and 7 are pushed in the direction of the disk rotor by means of e, 41f and 41g, and the linings 7a and 7a are brought into sliding contact with both side surfaces of the disk rotor 2 to perform a braking action.

The reaction portion 41b has two kinds of processed holes 5
Two and two, 53 are alternately arranged side by side in the disc axial direction, one machining hole 52 faces the shallow cylinder hole 42, and the other machining hole 53 faces the deep cylinder hole 43.
Five reaction force claws 41c to 41g are located on both sides of the four processed holes 52, 52, 53, 53 in the disk circumferential direction.

Adjacent reaction force claws 41c at the reaction portion 41b,
41d and the reaction force claws 41e and 41f are respectively provided with bottom plates 41h on the side opposite to the disk rotor.
d and the processing holes 52 sandwiched between the reaction force claws 41e and 41f,
52 is a bottomed hole which is covered by the bottom plate 41h, and the machining holes 53 and 53 which are located alternately with these holes are left penetrating in the disc axial direction.

Inside the processed hole 52 in the radial direction of the disk,
An opening 54 that is the same as or wider than the inner diameter of the opposing cylinder hole 42 is formed.
An interval L6 longer than the axial length L5 of the piston 50 and equal to or longer than the depth D3 of the cylinder hole 42 is set between h and the disc rotor side surface 41i of the acting portion 41a, The piston 50 can be inserted into and removed from the cylinder hole 42 through the opening 54 and the processed hole 53.

The disc brake 40 of this embodiment is a four-pot type caliper body 4 having a length in the disc circumferential direction.
Although it is a two-system type using 1, the pad pressing force on the reaction portion 41b side is increased by the two bottom plates 41h and 41h so as to be equalized as much as possible. The braking force can be fully exerted.

In the caliper body 61 of the disc brake 60 shown in the fourth embodiment of FIG. 6, two shallow cylinder holes 62 and two deep cylinder holes 63 are provided adjacent to each other in the operating portion 61a in the circumferential direction of the disc. , The hydraulic chambers 64, 64 of the shallow cylinder holes 62, 62 are connected to each other by the liquid passage hole 65 to form the first brake system, and the hydraulic chambers 6 of the deep cylinder holes 63, 63 are formed.
The pin slide type of the four-pot two-system type is used in which 6, 6 and 66 are communicated with each other through the liquid passage hole 67 for the second brake system.

The disc brake 60 operates the caliper body 61 in the disc axial direction by operating one or both of the first and second brake systems, so that the operating portion 6
1a pistons 70, 70 and / or pistons 71,
71 and the reaction force claws 61c, 61d, 61 of the reaction portion 61b
The friction pads 7 and 7 are pushed in the direction of the disc rotor by means of e, 61f and 61g, and the linings 7a and 7a are brought into sliding contact with both side surfaces of the disc rotor 2 to perform a braking action.

The reaction portion 61b has two types of processed holes 7
Two and 73 are alternately arranged side by side in the disc axial direction, one machining hole 72 faces the shallow cylinder hole 62, and the other machining hole 73 faces the deep cylinder hole 63.
Five reaction force claws 61c to 61g are located on both sides of the four processed holes 72, 72, 73, 73 in the disk circumferential direction.

Two bottom plates 61h, 61h are continuously installed on the anti-disc rotor side of the three reaction pawls 61c, 61d, 61e adjacent to each other on the disc turning-in side of the reaction portion 61b, and the reaction pawls 61c-61e are provided. A machining hole 72 sandwiched between
72 is a bottomed hole that is covered by the bottom plate 61h, and the processing holes 73, 73 located on the disc feed-out side are left penetrating in the disc axial direction.

Inside the processed hole 72 in the radial direction of the disk,
An opening 74, which is the same as or wider than the inner diameter of the opposing cylinder hole 62, is formed.
An interval L8 longer than the axial length L7 of the piston 70 and equal to or longer than the depth D4 of the cylinder hole 62 is set between h and the disc rotor side surface 61i of the acting portion 61a, The piston 70 can be inserted into and removed from the cylinder hole 62 through the opening 74 and the processed hole 72.

In each of the above-mentioned embodiments, the opening communicating with the machining hole between the pair of reaction force claws is formed on the inner side in the radial direction of the disk. However, the present invention is directed to other directions, for example, the machining hole. It may be provided on the outer side in the radial direction of the disk, or on the disk entry side or the entry side. Further, the number, shape, depth, layout, and number of brake systems of the cylinder holes and the machined holes can be appropriately changed without departing from the technical idea of the present invention.

[0041]

As described above, according to the caliper body of the vehicle disc brake of the present invention, the reaction force claw of the reaction portion is formed into a plurality of reaction force claws even if the reaction force claw is divided into a plurality of holes. Since the installed bottom plate secures a required pad pressing force on the reaction portion, it becomes possible to sufficiently exhibit the set braking performance. Further, the caliper body can be formed to be lightweight and compact by suppressing the length in the axial direction of the disc, and moreover, it can be easily carried out even in a narrow mounting space of the vehicle body by a simple operation.

[Brief description of drawings]

FIG. 1 is a sectional plan view of FIG. 2 showing a first embodiment of the present invention.

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

FIG. 3 is a III-I of FIG. 2 showing a first embodiment of the present invention.
II cross section

FIG. 4 is a sectional plan view of a disc brake showing a second embodiment example of the present invention.

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.

[Explanation of symbols]

1, 20, 40, 60 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4, 21, 41,
61 ... Caliper body, 4a, 21a, 41a, 61a
... action part, 4b, 21b, 41b, 61b ... reaction part,
4c ... Bridge part, 4h, 4i, 4j, 21c, 21
d, 21e, 21f, 41c, 41d, 41e, 41
f, 41g, 61c, 61d, 61e, 61f, 61g
... Reaction force claws, 4k, 21g, 41h, 61h ... Bottom plate, 4
m, 21h, 41i ... Side surface of disk rotor, 5, 6 ... Sliding pin, 7 ... Friction pad, 7a ... Lining, 7b ... Back plate 10, 11, 22, 23, 42, 43, 62, 63
... Cylinder holes, 12, 13, 32, 33, 52, 53,
72, 73 ... Machining holes, 15, 16, 30, 31, 42,
43, 50, 51, 70, 71 ... Piston, 17, 1
8, 24, 26, 44, 46, 64, 66 ... Hydraulic chamber, 1
9, 34, 54, 74 ... Openings, L1 ... Axial length of piston 16, L2 ... Bottom plate 4k and disc rotor side surface 4m
, L3 ... Axial length of piston 31, L4 ...
Distance between bottom plate 21g and disc rotor side surface 21h, L5
... axial length of piston 42, L6 ... distance between bottom plate 41g and disc rotor side surface 41i, L7 ... piston 70
In the axial direction, L8 ... Distance between bottom plate 61h and disk rotor side surface 61i, D1 ... Depth of cylinder hole 11, D2
... depth of cylinder hole 23, D3 ... depth of cylinder hole 42, D4 ... depth of cylinder hole 62

Claims (5)

[Claims] 1. A bridge portion provided across an outer periphery of a disk rotor, wherein an action portion provided on one side portion of the disk rotor and a reaction portion provided on another side portion of the disk rotor are provided. A plurality of bottomed cylinder holes that open toward the disc rotor side by side in the circumferential direction of the disc, and the pistons are inserted into the cylinder holes so that they are located on the bottom side of each cylinder hole. A hydraulic chamber is defined, a machining hole is provided in the reaction portion at a position facing the cylinder hole so as to penetrate in the disc axial direction, and reaction force claws are provided on both sides of the machining hole in the disc circumferential direction. In the pin slide type caliper body of the vehicle disc brake, the bottom plate is installed on the side opposite to the disc rotor of the pair of reaction force claws that are adjacent to each other with the machining hole interposed therebetween, and the machining hole between the pair of reaction force claws is Block the disk rotor with the bottom plate A distance between the bottom plate and a side surface of the disk rotor of the acting portion is set longer than an axial length of the piston, and an opening is provided between the pair of reaction force claws so that the piston can be inserted and removed. A disc brake caliper body for vehicles. 2. The caliper body for a vehicle disc brake according to claim 1, wherein the bottom plate is used as a processing hole on a disc entry side. 3. The caliper body for a vehicle disc brake according to claim 1, wherein the bottom plate is arranged in every other hole. 4. The caliper body for a vehicle disc brake according to claim 1, wherein the bottom plate is continuously provided in a plurality of adjacent processing holes. 5. The cylinder hole and the processing hole are arranged in three sets or more, the intermediate processing hole is closed by the bottom plate, and the intermediate cylinder hole facing the bottom plate is shallower than the cylinder holes on both sides. 2. The intermediate cylinder hole is formed for the first brake system, and the hydraulic chambers of the cylinder holes on both sides are communicated with each other for the second brake system. Caliper body of disc brake for vehicle.