JP3018266B2 - Divided caliper body for vehicle disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body for a disc brake mounted on a vehicle such as an automobile or a motorcycle, and more particularly, to a structure in which a plurality of divided pieces are connected by connecting bolts.

[0002]

2. Description of the Related Art A plurality of pieces are connected to a caliper body used for a vehicle disc brake due to the necessity of combining with different materials, assembling of parts such as pistons, and cutting after casting. There is a split caliper body composed of This split caliper body is divided into two or three pieces from a bridge portion straddling the outside of the disk rotor, and is integrally connected to the bridge portion by passing a plurality of connection bolts in the axial direction of the disk (for example, Japanese Patent Publication No. Sho 55-55). −
No. 14294).

[0003]

In such a split type caliper body, a divided piece facing a side of a disk rotor with a friction pad interposed therebetween is a brake transmitted from the disk rotor via the friction pad. The caliper body is pushed outward by the reaction force, and the caliper body as a whole is deformed so as to open in a C-shape with the bridge part as the fulcrum. Act as

[0004] The magnitude of the moment acting on the connecting bolt differs depending on the mounting position. For a connecting bolt receiving a load exceeding the average, damage to the bolt hole due to bending of the shaft portion or crushing of the thread is caused. It may be difficult to insert or remove the screw or screw the screwdriver, which may hinder the division and reassembly of the caliper body.

[0005] As is well known, the braking reaction transmitted through the friction pad is generated with the same magnitude as the thrust as a reaction to the thrust from a piston or reaction claw inserted in the cylinder hole. Therefore, when this braking reaction force is replaced with thrust by a piston or reaction force claw, the moment applied to each connection bolt is large depending on the distance from the cylinder hole where the piston is inserted to the connection bolt, and the diameter of the cylinder hole. It turns out that it is affected. That is, since this moment is thrust × distance, for example, if the distance from the cylinder hole to the connection bolt is long or if the cylinder hole is large in diameter, the moment acting on the connection bolt also increases, and conversely, from the cylinder hole. If the distance to the connection bolt is short or the cylinder hole is small in diameter, the moment will also be small.

Further, since the thrust of the reaction claw is determined by the pad pressing force of the piston, the conditions such as the distance from the cylinder hole to the connection bolt and the diameter of the cylinder hole are adjusted so that the entire moment is applied to the plurality of connection bolts. If it is set so as to be distributed and applied on average, it becomes difficult for the bending load to concentrate on some connecting bolts.

The present invention has been made in view of such a situation, and an object of the present invention is to make the moment due to the braking reaction force as even as possible with each connecting bolt and to prevent the deformation due to the overload. It is an object of the present invention to provide a divided caliper body for a vehicle disk brake, in which the overall durability is improved by preventing the caliper body as much as possible.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a plurality of divided pieces from a bridge portion straddling the outside of a disk rotor are inserted through the bridge portion in the disk axial direction. A plurality of cylinder holes for accommodating a piston are arranged in the disk circumferential direction in at least one divided piece facing the side surface of the disk rotor, and these cylinder holes are formed to have different diameters. In the divided caliper body for a disc brake for a vehicle, the connecting bolts
One pair each at the outside of the disc hole in the radial direction of the
Correspondingly, the combination of the cylinder hole and the connection bolt is
Disk radial direction passing through the rotation center of the disk rotor
They are arranged symmetrically across the line (L1), and
The radius of the disc between the aligned cylinder hole and the connecting bolt
Distance (P4, P5, P6) parallel to the direction line (L1)
In inverse proportion to the diameter of the
It is set longer for smaller and smaller cylinder bores .

[0009]

According to the present invention, the number of connecting bolts must be sufficient and necessary.
The number of cylinder holes so that the
From the small cylinder bore with small thrust
Increase the distance (P4) to the tie bolt with a large diameter
Distance (P)
5) By setting it longer in inverse proportion to (P6)
Connecting bolts and large-diameter
The moment applied to the connection bolt corresponding to the
Since the force is evenly distributed, some connecting bolts
Overload is less likely to occur.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.
I will tell.

The disc brake 1 rotates in the direction of arrow A.
Is fixed to the vehicle body at one side of the rotating disk rotor 2.
The caliper body 4 is mounted on the slide bracket 3
Supported in the axial direction of the disc via
ing.

The caliper body 4 has a bridge 4c.
Of the disk rotor 2
Split pieces 4a, 4 on the action section side and the reaction section side
b was connected by three connecting bolts 7d, 7e, 7f.
The two-piece type caliper body has these split pieces 4a, 4
b, a pair of friction pads 8, 8
Are arranged opposite to each other with the heater 2 interposed therebetween.

The split piece 4a on the working section side has three shells.
Binder holes 9d, 9e and 9f are also provided on the divided pins on the reaction portion side.
The reaction claw 4d, commonly called a solid plate, is provided on the base 4b.
Each is arranged in the circumferential direction of the disk. Three on the working part side
The cylinder holes 9d, 9e, 9f of the
d is formed in a small diameter, and the two cylinder holes 9e,
9f is formed to have the same diameter slightly larger than this,
Connect the cylinder holes 9e and 9f on both sides with a communication passage 9g.
The pistons 10e, 10f of the cylinder holes 9e, 9f
And the piston in the central cylinder hole 9d
Hydraulic path using 10d alone
I have.

Also, the divided piece 4a on the action section side
Is formed integrally with the entire bridge portion 4c.
Inlet ports 4e, 4f and Brewda boss 4
g, 4h communicate with the cylinder holes 9d, 9e, 9f.
Is provided. From the inlet ports 4e and 4f,
When the pressurized hydraulic fluid is supplied to each of the above hydraulic paths,
Air in the hydraulic path and hydraulic fluid
Are discharged from the outlets 4g and 4h.

The inner peripheral portion of the divided piece 4a on the disk reciprocating side and
The mounting arms 4i and 4j extend to the outer periphery of the disc outlet side.
Has been established. A key is attached to the mounting arm 4i on the disk entry side.
Catcher Li Pas bracket 3 one of the slide pins 5 projecting from the
Is inserted, and the mounting arm 4j on the disc outlet side is fitted with a cap.
Other than being inserted into the caliper support arm 3a of the lipper bracket 3
One of the slide pins 6 protrudes from the
Day 4 has two slide pins mounted in this way.
Movement in the disk axis direction is guided by 5, 6
You. Projections are provided on the disc reciprocating sides of the divided pieces 4a and 4b.
There are arms 4k, 4m, and these protruding arms 4k, 4m
A hanger for holding the frictional pads 8, 8 on the disk entry side
The pin 11 is straddled across the outer circumference of the disk rotor 2.
You.

The friction pads 8, 8
Lining 12 sliding on the side, caliper bracket
3 and the back plate 13 held by the caliper body 4
Has become. The hanging arm 13 is used for inserting the disc into the back plate 13.
a, and the torque receiving arm 13b is
Each friction pad 8 is projected
Suspension arm 13a on the above-mentioned hanger pin 11
Then, attach the torque receiving arm 13b on the disc outlet side to the caliper
The disk is engaged with the torque receiving concave portion 3b of the support arm 3a.
It is supported movably in the axial direction.

The three cylinder holes 9d, 9e, 9f are
As described above, the center cylinder hole 9d is
e, 9f are formed slightly smaller in diameter.
The centers C4, C5, and C6 correspond to the rotation center of the disk rotor 2.
It is arranged on the so-called effective radius R1 of the disk as a fulcrum.
ing. Further, the center cylinder hole 9d is provided with a disc row.
Between the center of rotation of the caliper body 4 and the center of the body of the caliper body 4.
Located on the disk radial line L1 and the outer two
Of the disk radial direction L
1 are symmetrically arranged. Also, the reaction force nail 4 of the solid plate
d is also symmetrical with respect to the disk radial line L1.
Has been established.

[0018]Connecting the two divided pieces 4a, 4b
The three connecting bolts 7d, 7e, 7f are connected to the cylinders described above.
The bridge portion 4c is provided outside the holes 9d to 9f in the disk radial direction.
Are provided in the axial direction of the disk. Of which
The center connecting bolt 7d has a center C4 at the disk radial direction line.
L1 and connecting bolts 7e, 7f on both sides
Pass through the centers C5 and C6 of the cylinder holes 9e and 9f on both sides.
Than the lines L2 and L3 parallel to the disk radial line L1
The disk is arranged slightly outside in the circumferential direction.

The center of the connecting bolts 7d, 7e, 7f
Are B4, B5, and B6, respectively,
Cylinder hole 9d combined on disk radial line L1
P4 from the center C4 of the connection bolt to the center B4 of the connecting bolt 7d
And the centers C5 and C6 of the cylinder holes 9e and 9f on both sides thereof.
From the centers B5, B of the corresponding connecting bolts 7e, 7f.
The distance P in the direction parallel to the disk radial line L1 up to 6
The relationship between P5 and P6 is as follows: distance P4> distance P5 = distance P6
Has become.

That is, in the embodiment, the center cylinder hole 9d is provided.
Are formed with a smaller diameter than the cylinder holes 9e and 9f on both sides.
The pressing thrust of the piston 10d against the friction pad 8 is
Smaller than large-diameter cylinder holes 9e and 9f on both sides
Distance to the connection bolt 7d corresponding to the cylinder hole 9d.
The separation P4 is connected to the large-diameter cylinder holes 9e and 9f and the connection bolt 7
e and 7f should be set to be long in inverse proportion to the distances P5 and P6.
By means of the connection bolt 7d at the center and the connection bolts 7 on both sides
e and 7f are distributed as evenly as possible.
I'm trying.

In this embodiment, as described above,
Three large and small cylinder holes 9d, 9e, 9f
Of the same number of
The connecting bolts 7d, 7e, 7f are connected to the disk radial direction line L1.
Are arranged symmetrically with respect to the cylinder holes 9d and 9
e, 9f and connecting bolts 7d, 7e, 7f
The distances P4, P5 and P6 are inversely proportional to the bore of the cylinder bore.
In the large-diameter cylinder holes 9e and 9f,
The length is set long in the simple cylinder hole 9d.

With such a configuration, the divided peak on the action section side
In 4a, three pistons 10d, 10e, 10f
The thrust is applied to the braking reaction force, and the reaction
The divided piece 4b has the same size as the divided piece 4 on the action section side.
It receives the braking reaction force of magnitude. And these braking reaction forces
(Thrust) multiplied by the distance gives the connecting bolt 7
d , 7e and 7f.

Further connected from the pistons 10d to 10f
The moment applied to each of the bolts 7d to 7f is
When divided by the divided piece 4a on the application part side, the disc radius
Piston 10d x length with small diameter and small thrust on direction line L1
Distance P4 = moment acting on connecting bolt 7d,
A piston 10e (or 1) having a large thrust on both sides and a large thrust
0f) × short distance P = each of connecting bolts 7e and 7f
Is averaged as much as possible, and the braking reaction
Moment is evenly distributed to connecting bolts 7d to 7f as much as possible.
It works by scattering.

In this embodiment, the braking reaction force is
Is equally divided into three connecting bolts 7d to 7f.
Moment is applied to some connecting bolts and bolt holes.
Without concentrating and causing damage such as bending and crushing
It becomes possible to remove and insert the connecting bolts 7d to 7f
Becomes better, for maintenance such as replacement of friction pad 8
Easy to divide and reassemble the caliper body 4
Can do it. Also, the divided pieces 4a, 4b and
The durability of the tying bolts 7d to 7f is improved, and it can be used repeatedly.
The economic effect is also high because it can withstand well.

It should be noted that the present invention provides a plurality of two or more cylinder holes.
It is possible to apply to the caliper body which has. Also,
Even if the binder hole is out of the effective radius of the disc,
What is necessary is just to set the distance with a connection bolt according to this.
Furthermore, multiple cylinder holes are opposed on both sides of the disk rotor
Can be applied to the caliper body facing the piston
is there.

[0031]

【The invention's effect】 The split caliper body of the present invention
Is configured as described in
Moment is applied to the necessary and sufficient number of connecting bolts.
Force is evenly distributed, and some connecting bolts and bolt holes
It no longer acts as a bending load due to tension or compression. to this
Connection and removal of connecting bolts and screwdriver
When performing maintenance such as replacing the pad,
Can be easily divided and reassembled.
You. In addition, the durability of split pieces and connecting bolts has been improved,
It is also economical because it can withstand repeated use.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG.

FIG. 2 is a partial sectional plan view of a disc brake showing one embodiment of the present invention.

FIG. 3 is a front view of FIG. 2;

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

FIG. 5 is a sectional side view showing only the caliper body.

FIG. 6 is a rear view of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 4a ... Dividing piece on working part side 4b ... Dividing piece on reaction part side 4c ... Bridge part integrally formed with dividing piece 4a on working part side 4d ... Reaction force claw 7d , 7e, 7f connecting bolt 8 friction pad 9d, 9e, 9f cylinder hole 10d, 10e, 10f piston A rotating direction of disc rotor 2 B4 center of connecting bolt 7d B5 center of connecting bolt 7e B6 C4: Center of cylinder hole 9d C5: Center of cylinder hole 9e C6: Center of cylinder hole 9f L1: Rotation center of disk rotor 2 and caliper body 4
Lines L2, L3... Parallel to the disk radial line L1 passing through centers C5 and C6 of cylinder holes 9d and 9f. P4. Center C4 of cylinder hole 9d and center B4 of connecting bolt 7d. P5: distance between the center C5 of the cylinder hole 9e and the center B5 of the connection bolt 7e P6: distance between the center C6 of the cylinder hole 9f and the center B6 of the connection bolt 7f R1: effective disk radius

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-213732 (JP, A) JP-A-59-226723 (JP, A) JP-A-61-31732 (JP, A) 54337 (JP, U) Japanese Utility Model No. 2-65724 (JP, U) Japanese Utility Model Application No. Sho 62-30029 (JP, U) Japanese Utility Model Application No. 4-54337 (JP, U) Japanese Utility Model Utility Model No. 62-162426 (JP, U) Japanese Utility Model Application Hei 4-109695 (JP, U) Japanese Utility Model Application Hei 3-26841 (JP, U) Japanese Utility Model Application Hei 1-37235 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 49/00-71/04

Claims (1)

(57) [Claims] 1. A plurality of divided pieces from a bridge portion straddling the outside of a disk rotor are connected to the bridge portion by connection bolts inserted in the disk axial direction, and face the side surfaces of the disk rotor. A plurality of cylinder holes for accommodating pistons are arranged in at least one of the divided pieces in the disk circumferential direction, and these cylinder holes are
In the split caliper body for a vehicle disk brake formed to have different diameters, the connecting bolt may be connected to each of the cylinders.
Each one corresponds to the outside of the hole in the radial direction of the disk.
The combination of the cylinder hole and the connecting bolt is
Disk radial line (L
1) are arranged symmetrically with respect to each other.
Radial line of the disc with the connected cylinder hole and connecting bolt
The distance (P4, P5, P6) parallel to (L1) is
In inverse proportion to the diameter of the bore, it is short in large cylinder bores,
A split caliper body for a disc brake for a vehicle, wherein the caliper body is set long with a small-diameter cylinder hole .