JPH11132265A - Vehicular disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form oil passages on a caliper body, for connecting a plurality of cylinders provided on the caliper body to different oil pressure sources. SOLUTION: Recessed parts 131 , 151 are formed on the bottom surfaces of second and third cylinders 13, 15 positioned on both ends, out of first to third cylinders 13, 14 and 15 provided on a caliper body 12 so as to be mutually adjacent to one another, and a straight first oil passage a1 passing the back part of the first cylinder 14 and for communicating the recessed parts 131 , 151 with each other, a second oil passage a2 for connecting the third cylinder 15 to a first oil pressure source, and a third oil passage (b) for connecting the first cylinder 14 to a second oil pressure source are formed on the caliper body 12. The recessed parts 131 , 151 are integrally formed with prepared holes when the prepared holes for processing the second and third cylinders 13, 15 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body in which three cylinders arranged adjacent to each other along a peripheral edge of a disk plate are recessed, and a piston slidably fitted to these cylinders is provided. The present invention relates to a vehicle disk brake device that is hydraulically driven to press a brake pad against the disk plate.

[0002]

2. Description of the Related Art Such a disk brake device for a vehicle includes:
For example, it is known from U.S. Pat. No. 3,734,248.

In the above-mentioned conventional type, of the three cylinders formed on the caliper body, two of the outer cylinders and one at the center are connected to different hydraulic pressure sources, and the two outer cylinders are connected to the caliper. Two pipes extending from the body to the outside
After merging with the book, it is connected to a hydraulic source.

[0004]

As described above, when two pipes extending from the two outer cylinders are joined outside the caliper body, the pipes become complicated, the brake device becomes large, and the appearance is deteriorated. And other problems occur. Therefore, it is conceivable that two cylinders are connected to each other by an oil passage formed inside the caliper body, and one of the cylinders is connected to a hydraulic pressure source through one pipe. However, if the two outer cylinders are to communicate with each other via the oil passage, the center cylinder becomes an obstacle, and it becomes difficult to form the oil passage, which increases the number of processing steps and the processing cost of the oil passage. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has an object to easily form an oil passage for connecting a plurality of cylinders provided in a caliper body to different hydraulic sources in the caliper body. With the goal.

[0006]

In order to achieve the above object, the invention according to the first aspect provides a caliper body having three cylinders arranged adjacent to each other along the periphery of a disk plate. In a disc brake device for a vehicle, which is recessed and presses a brake pad against the disc plate by driving a piston slidably fitted to these cylinders by hydraulic pressure, a first cylinder located at the center and located on both sides thereof. The second and third cylinders are formed at substantially the same depth, and concave portions are respectively provided on the bottom surfaces of the second and third cylinders. The second and third cylinders pass through the back of the first cylinder in the caliper body. The first oil passage communicating the recesses of the first cylinder and one of the second and third cylinders are connected to the first oil passage.
A second oil passage connected to the hydraulic pressure source and a third oil passage connecting the first cylinder to the second hydraulic pressure source are formed.

According to the above configuration, of the three cylinders provided in the caliper body, the first oil passing through the back of the first cylinder is provided in the recesses provided in the bottom surfaces of the second and third cylinders on both sides. Since the first oil passage is communicated with the first oil passage, the first oil passage hardly interferes with the first cylinder when the first oil passage is formed, thereby facilitating the processing of the first oil passage. Further, it is not necessary to form the second and third cylinders deeper than when the second and third cylinders are formed deeper than the first cylinder and the second and third cylinders are connected by the first oil passage. This makes it possible to reduce the number of processing steps and the amount of brake oil.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the concave portion is formed integrally with a pilot hole when processing the second and third cylinders. .

According to the above construction, the concave portion can be formed at the same time when the lower holes of the second and third cylinders are formed, so that the number of special steps for forming the concave portion is reduced.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the first oil passage is formed linearly.

According to the above configuration, since the first oil passage is formed in a straight line, the processing is further facilitated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of a motorcycle, FIG. 2 is a system diagram of a brake, FIG. 3 is a front view of a disk brake device, and FIG. 3 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG.
FIG. 6 is a view taken along line 6-6 of FIG.

1 and 2, reference numeral 1 denotes a front wheel, 2 denotes a rear wheel, a front wheel 1 is supported by a lower end of an inverted front fork 3, and a rear wheel 2 is supported by a rear end of a rear fork 5. Reference numeral 7 denotes a fuel tank, 8 denotes a handle, and a handle 8
Is provided with a brake lever 9, and a brake pedal 10 is provided below the vehicle body side portion.

Disk brake devices A and B are provided on the left and right of the front wheel 1, respectively, and a disk brake device C is provided on the right of the rear wheel 2. In FIG. 2, one front fork 3 is drawn from two directions for convenience.

3 to 5, reference numeral 12 denotes a caliper body, 13, 14, and 15 denote cylinders formed on the caliper body 12, 16 denotes a brake pad, 18 denotes a disk plate, and 20, 21, 22 denote the cylinders 13 and 14. , 1
5 are pistons that are provided in the respective sections 5 and press the brake pad 16 against the disc plate 18. Of the three cylinders 13, 14, and 15, the cylinder 14 located at the center constitutes the first cylinder of the present invention, and the two cylinders 13 and 15 located on both sides thereof correspond to the second cylinder and the second cylinder of the present invention, respectively. The third cylinder is configured.

The three cylinders 13, 14, 15 are identical.
A first cylinder 1 having a diameter and depth but in the middle
The second and third cylinders 13 and 15 located on both sides of
The recess 13₁, 15₁Is provided. Cap
Forming cylinders 13, 14, 15 in lipper body 12
At a predetermined depth when the caliper body 12 is cast.
The pilot hole is formed, and the inner peripheral surface of this pilot hole is bored.
I do. At this time, the lower holes of the second and third cylinders 13 and 15
Recess 13 having a diameter smaller than that of the pilot hole₁, 15 ₁The one
And when recessing the prepared hole, the concave portion
13₁, 15₁Should be left. Thus, the second and third systems
The recess 13 is integrally formed with the lower holes of the cylinders 13 and 15.₁, 15₁To
If formed, the recess 13₁, 15₁Special for forming
This eliminates the need for processing, thereby reducing the number of processing steps.

The recess 13 of the second and third cylinders 13 and 15
₁, 15₁Is a linear first oil passage a₁Communicate with each other by
I do. First oil passage a₁Is the lengthwise direction of the caliper body 12
Drilled from the end, the open end of which is
Is closed. First oil passage a ₁2nd and 3rd cylinder 1
3, 15 recesses 13₁, 15₁By communicating with
The first oil passage a₁Should not interfere with the first cylinder 14
Can pass through the back of the spider. In addition, caliper
One of the second and third cylinders 13 and 15 is
(In the embodiment, the concave portion 15 of the third cylinder 15)₁)
Linear second oil passage a_TwoAnd the first cylinder 14
And a third linear oil passage b is formed.

If the recesses 13 ₁ , 15 ₁ are not formed in the second and third cylinders 13, 15, the second and third cylinders 13, 15 are required to avoid interference with the first cylinder 14. the need to complicate the first oil passage a ₁ shape communicating, the number of processing steps is increased. If, second, if deeper than the third cylinder 13 and 15 the first cylinder 14, the second in the first oil passage a ₁ straight, but the third cylinder 13 and 15 may be in communication, By doing so, not only does the processing amount of the second and third cylinders 13 and 15 increase and the processing cost increases, but also the dead space of the second and third cylinders 13 and 15 increases and the required amount of brake oil decreases. Will increase. On the other hand, according to the present embodiment, the number of processing steps and the amount of brake oil can be reduced.

The brake pad 16 is divided into two divided linings 16b located on the disk plate 18 side.
And the back plate 16 located on the opposite side of the disc plate 18.
a. Hole 16a _{1 in} the center of back plate 16a
Is formed, and a concave portion 26 is formed between the pair of linings 16b corresponding to the position of the central piston 21. On the surface of the lining 16b facing the disk plate 18,
In order to enhance the heat radiation effect of the lining 16b, the groove 16b
₁ is formed in a direction perpendicular to the longitudinal direction of the brake pad 16. The groove 16b ₁ is used for the lining 16b during braking.
It also contributes to the discharge of abrasion powder generated from the steel.

A push plate 31 is arranged on the surface of the brake pad 16 on the piston 21 side so as to correspond to the hole 16a, and this push plate 31 is fixed to the tip of the piston 21 via a locking spring 31d. The pressing plate 31 is set to have a size larger than the recess 26 so that a part thereof overlaps with the lining 16b in plan view.

As shown in FIG. 3, extending portions 31a are formed at four corners of the pressing plate 31. This extension 31a is the piston 2
0, 22 are formed in an arc shape, and have pressure receiving surfaces P, P as shown by oblique lines, and the side end 31b of the extension portion 31a is formed on the side surface of the brake pad 16 as shown in FIG. Engage.

The caliper body 12 of the brake devices B and C
The internal structure is the same as that of the brake device A, and includes the cylinders 13, 14, 15, and the pistons 20, 21, 22, respectively.
2, concave portion 26 of brake pad 16, first to third oil passages a
_1, a _2, b and the like.

The upper and lower parts of the caliper body 12 of the brake device A are attached to an arm 33 as shown in FIG. 2, and this arm 33 is attached to the front fork 3 via brackets 34 and 35. On the other hand, the upper and lower parts of the caliper body 12 of the brake device B are attached to an arm 36, and the lower part of the arm 36 is pivotally attached to a bracket 37. The upper portion of the arm 36 is pivotally connected to the rear end of the link 38, and the front end of the link 38 is pivotally connected to one end of a V-shaped swing arm 39. The other end of the swing arm 39 is pivotally attached to a lower end of a piston rod 41 of a secondary master cylinder 40 disposed in front of the front fork 3. Incidentally, the secondary master cylinder 40 constitutes a first hydraulic pressure source of the present invention.

Next, an overall brake system will be described with reference to FIG.

In FIG. 2, reference numeral 43 denotes a master cylinder on the brake lever 9 side constituting the first hydraulic pressure source of the present invention, 44 denotes a master cylinder on the brake pedal 10 side constituting the second hydraulic pressure source of the present invention, and 45 denotes a reservoir. The oil passage c extending from the master cylinder 43 indicates two tanks d and e.
The oil passage d branches through the second oil passage a ₂ and the first oil passage a ₁ of the brake device A to the second and third oil passages d.
It communicates with the cylinders 13 and 15. Further, the oil passage e is second, communicating in the third cylinder 13 and 15 in the second oil passage a ₂ and the first through the oil passage a ₁ the brake device B of the brake system B.

Two oil passages f and g extend from the master cylinder 44 on the brake pedal 10 side.
(Proportional control valve) 46 communicates with the third oil passage b of the brake device C via the third oil passage b
Through the first cylinder 14. The oil passage g branches into two oil passages h and i, and the oil passage h communicates with the first cylinder 14 via the third oil passage b of the brake device A.
The oil passage i further branches into two oil passages j and k. The oil passage j is connected to the first cylinder 14 via the third oil passage b of the brake device B.
And the oil passage k communicates with the secondary master cylinder 40.

The oil passage m is from the secondary master cylinder 40 is extended, the oil passage m is communicated with the second oil passage a ₂ and the first oil passage a ₁ of the brake device C via the PCV47, the second second, it communicates with the third cylinder 13 and 15 through the oil passage a ₂ and the first oil passage a _1.

In the above, when the brake lever 9 is operated, oil flows from the master cylinder 43 into the oil passage c, and the oil flows through the oil passages d and e to the brake devices A and B.
Flows into the second oil passage a ₂ and the first oil passage a ₁ of B. Second
The oil that has flowed into the oil passage a ₂ and the first oil passage a ₁
After flowing into the third cylinders 13 and 15, the pistons 20 and 22
To press the lining 16b of the brake pad 16 against the disk plate 18, and the brake devices A and B operate to apply a braking force to the front wheel 1 side.

On the other hand, if the brake pedal 10 is operated,
Oil flows from the master cylinder 44 into the oil passages f and g. The oil that has flowed into the oil passage f is the PCV 46 and the third oil passage b.
Flows into the first cylinder 14 of the brake device C through
The piston 21 is urged to press the lining 16b of the brake pad 16 against the disk plate 18, and the brake device C is operated, and a braking force is applied to the rear wheel 2 side. The oil flowing into the oil passage g flows into the oil passage h and the oil passage i, and the oil passage h
Flows into the first cylinder 14 via the third oil passage b of the brake device A, and urges the piston 21 to operate the brake device A. Further, the oil flowing into the oil passage i flows into the oil passages j and k, and the oil flowing into the oil passage j flows into the first cylinder 14 through the third oil passage b of the brake device B, thereby causing the piston 21 to move. The brake device B is actuated. The oil flowing into the oil passage k flows into the secondary master cylinder 40, the oil flows from the secondary master cylinder 40 into the oil passage m, and the oil flows through the PCV 47 to the second oil passage of the brake device C. a ₂ and the first oil passage a ₁ , and from here into the second and third cylinders 13 and 15 to urge the pistons 20 and 22.

When the brake device B operates,
A counterclockwise reaction force acts on the caliper body 12 of the brake device B as shown by an arrow A in FIG.
Swings in the direction a about its pivot point. With this swing, the arm 38 moves to the left in FIG. 2, whereby the swing arm 39 swings counterclockwise about its pivot point, and the piston rod 41 of the secondary master cylinder 40 moves. Move up. Thereby, the secondary master cylinder 40
Flows into the oil passage m, and urges the pistons 20, 22 of the brake device C in the same manner as described above. There are two types of operation of the secondary master cylinder 40, one is based on oil flowing from the oil passage k, and the other is based on swinging of the caliper body 12, but it is assumed that only one of the larger ones operates. .

By the way, the piston 21 of each of the brake devices A, B, and C and the pistons 20, 22 are separate systems. If the brake device A is taken as an example, as shown in FIG. When the oil flows into the _second and first oil passage a ₁ pistons 20, 22 move upward in FIG. 5 (b direction), thereby the brake pads 16 also move, the lining 16b of the brake pad 16 is disc plate 18 Pressed.

On the other hand, when oil flows into the first cylinder 14 and the piston 21 moves upward (direction B) in FIG. 5, the brake pad 16 moves via the pressing plate 31, and the lining 16b Is disk plate 1
Pressed to 8.

As described above, according to the present embodiment, since the concave portion 26 is provided in the portion corresponding to the central piston 21 in the pair of linings 16b of the brake pad 16, when only the central piston 21 operates, There is no lining 16b in the portion corresponding to the piston 21,
Instead, the lining 16b abuts on the disk plate 18 at a wide area before and after the recess 26.
Therefore, even if only the central piston 21 operates, it is possible to prevent the central portion of the lining 16b of the brake pad 16 from being unevenly worn.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the second and third cylinders 1
Recess 13 using pilot holes 3 and 15 ₁, 15₁Form
However, a separate recess 13 is used without using a pilot hole.₁, 15₁To
Processing is also possible.

[0037]

As described above, according to the first aspect of the present invention, of the three cylinders provided on the caliper body, the concave portions provided respectively on the bottom surfaces of the second and third cylinders on both sides are provided. , The first oil passage passing through the back of the first cylinder communicates with the first oil passage. Therefore, when the first oil passage is formed, the first oil passage hardly interferes with the first cylinder. Processing of roads becomes easier. Further, it is not necessary to form the second and third cylinders deeper than when the second and third cylinders are formed deeper than the first cylinder and the second and third cylinders are connected by the first oil passage. This makes it possible to reduce the number of processing steps and the amount of brake oil.

According to the invention described in claim 2,
Since the concave portion can be formed at the same time when the lower holes of the second and third cylinders are formed, a special man-hour for forming the concave portion is reduced.

According to the invention described in claim 3,
Since the first oil passage is formed in a straight line, the processing is further facilitated.

[Brief description of the drawings]

FIG. 1 is a plan view of a motorcycle.

FIG. 2 is a system diagram of a brake system.

FIG. 3 is a front view of the disc brake device.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a view taken along line 6-6 of FIG. 5;

[Explanation of symbols]

Reference Signs List 12 Caliper body 13 Second cylinder 13 ₁ recess 14 First cylinder 15 Third cylinder 15 ₁ recess 16 Brake pad 18 Disc plate 20 Piston 21 Piston 22 Piston 40 Secondary master cylinder (first hydraulic power source) 43 Master on brake lever side cylinder (first oil pressure source) 44 brake pedal-side master cylinder (the second hydraulic source) a ₁ first oil passage a ₂ second oil passage b third oil passage

Claims (3)

[Claims] 1. Three cylinders (13, 13) arranged adjacent to each other along the periphery of a disk plate (18).
14 and 15) are recessed in the caliper body (12), and the pistons (20, 21, 22) slidably fitted to the cylinders (13, 14, 15) are hydraulically driven to drive the brake pads (16, 15). ) Is pressed against the disc plate (18), wherein the first cylinder (14) located at the center and the second and third cylinders (13, 15) located at both sides thereof have substantially the same depth. And the second and third cylinders (13, 1).
The recesses (13 ₁ , 15 ₁ ) are provided on the bottom surface of the 5), and the caliper body (12) passes through the back of the first cylinder (14) and the recesses (13, 15) of the second and third cylinders (13, 15). 13 ₁ , 15 ₁ ), a first oil passage (a ₁ )
And a second oil passage (a ₂ ) connecting one of the second and third cylinders (13, 15) to the first hydraulic pressure source (40, 43).
And a third oil passage (b) connecting the first cylinder (14) to the second hydraulic power source (44). 2. The second and third cylinders (13, 15).
(13 ₁ , 1)
5. The vehicle disk brake device according to claim 1, wherein 5 ₁ ) is formed. 3. The vehicle disc brake device according to claim 1, wherein said first oil passage (a ₁ ) is formed in a straight line.