JPH10273086A - Dual brake system for bar handle vehicles - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the size and weight of a dual system disc brake and reduce the unsprung load. Effectively prevents tilting of the caliper body and uneven wear of the friction pad. A caliper body (10) is provided with a large-diameter piston (2).
3 and a small-diameter piston 24 facing each other. Move the caliper body 10 to the caliper bracket 17
Are supported so as to be slidable in the axial direction of the disk via slide pins 18, 19 and 19. The large diameter hydraulic chamber 27 is connected to the first hydraulic master cylinder 11. The small-diameter hydraulic chamber 28 is connected to the second hydraulic master cylinder 13. A check valve 31 that allows the flow of the hydraulic fluid only to the hydraulic chamber side is interposed in each of the fluid communication holes 30. The small-diameter piston 24 and the rear wheel drum brake 6 are linked by the hydraulic fluid of the second hydraulic master cylinder 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device used for a bar-handle vehicle such as a motorcycle, a three-wheeled vehicle, and a three- or four-wheeled buggy, and more particularly, to at least one of a front wheel brake and a rear wheel brake. The present invention relates to a disc brake using a two-pot opposed caliper body, and relates to a two-branch type brake system for a bar handle vehicle in which two pistons are operated by different brake systems.

[0002]

2. Description of the Related Art As a two-system brake device used for a motorcycle, there are, for example, those disclosed in Japanese Patent Publication No. 55-3574 and Japanese Patent Application Laid-Open No. 56-154378.
Each of these prior arts uses a disc brake. In the former two-system brake device, four cylinders are provided on both working portions disposed on both sides of the disc rotor on a caliper body of the disc brake. The disk rotor is a four-pot opposed type in which holes are arranged to face each other, a piston is accommodated in each of the cylinder holes, and each piston is hydraulically operated with hydraulic fluid supplied to a hydraulic chamber at the bottom of the cylinder hole. A pair of hydraulic chambers opposed to each other with a fluid communication hole therebetween communicate with each other, and a first brake pressure is raised to one of the hydraulic chambers by operating a first brake operating member. A hydraulic master cylinder is connected, and another set of hydraulic chambers, which are also opposed to each other with the disk rotor interposed therebetween, communicate with each other through a liquid through hole.
A second hydraulic master cylinder is connected to one of the hydraulic pressure chambers for increasing the hydraulic fluid pressure by operating a second brake operator.

[0003] In the latter two-system brake system,
The caliper body of the disc brake is a one-sided parallel two-pot pin slide type in which two pistons are arranged only on one side of the disc rotor and slides in the disc axial direction using a slide pin during braking. A first hydraulic master cylinder operated by a first brake operator is connected to the hydraulic chamber, and a second hydraulic master cylinder operated by a second brake operator is connected to the other hydraulic chamber. In each of the two-system brake devices, the disc brake can be operated by either the first brake operator or the second brake operator.

[0004]

However, in the former two-system brake system, a caliper body having a structure of at least four pots or more is required to operate the disc brake by each of the two brake systems. Therefore, there is a problem that the entire disc brake becomes large and heavy, which leads to an increase in unsprung load of the vehicle body.

[0005] In the latter dual system brake device,
When the two pistons are operated by different brake systems, an eccentric load acts on the caliper body, thereby impairing the slidability during braking, and further causing the friction pad to wear unevenly due to such tilting of the caliper body. There is.

Accordingly, the present invention is directed to a bar handle vehicle for a bar handle vehicle capable of effectively preventing tilting of a caliper body and uneven wear of a friction pad while reducing the size and weight of a disc brake and reducing the unsprung load. It is intended to provide a system brake device.

[0007]

According to the above object, according to the first aspect of the present invention, a caliper body of a disc brake is provided with a pair of cylinder holes opposed to both working portions provided on both sides of a disc rotor. A piston is accommodated in each of the cylinder holes, and each piston is of a two-pot opposed type that is hydraulically operated by a hydraulic fluid supplied to a hydraulic chamber at the bottom of the cylinder hole, and the caliper body is fixed to a vehicle body. A first hydraulic pressure that raises the hydraulic fluid by operating a first brake operator while supporting one of the hydraulic pressure chambers in such a manner that the caliper bracket is slidable in the axial direction of the disk via a slide pin. The other of the hydraulic chambers is connected to a master cylinder, and the other hydraulic chamber is connected to a second hydraulic master cylinder, which pressurizes hydraulic fluid by operating a second brake operator, and each hydraulic chamber is connected to a first hydraulic pressure. Between the static cylinder or the second hydraulic pressure master cylinder, interposed a check valve to look acceptable distribution of hydraulic fluid to the hydraulic chamber side.

According to the first aspect of the present invention, the first and the second
When the hydraulic fluid is supplied to the two hydraulic chambers by the operation of the brake operator, both pistons are pushed out of the cylinder holes toward the opening by the expansion of the hydraulic chambers, and each friction disposed in front of the piston is displaced. The pads are pressed against both sides of the disk rotor. Here, when both pistons of the caliper body have the same diameter, both braking reaction forces acting on the caliper body through the piston from the disk rotor become equal, so that the caliper body does not slide in the disk axial direction.

When the hydraulic fluid is supplied to only one or the other of the hydraulic chambers, the piston on the hydraulic fluid supply side is pushed out, and the friction pad on the front of the piston is pressed against one side of the disk rotor. Is done. Each hydraulic chamber and the first,
Since the check valves are interposed between the second hydraulic master cylinder and the second hydraulic master cylinder, backflow of the hydraulic fluid from the hydraulic chamber side to the hydraulic master cylinder side does not occur. For this reason, the braking reaction force from the disk rotor generated by the above-described operation acts in the direction of the hydraulic fluid supply-side piston, and the caliper body slides integrally with the piston on the hydraulic fluid non-supply side in the same direction. A friction pad on the front of the piston is pressed against the other side of the disk rotor.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the disk brake of the first aspect is a front wheel brake, and a pair of opposed pistons are formed to have different diameters. The chamber is formed as a large-diameter piston-side hydraulic chamber operated by a first brake operator, and the other hydraulic chamber is formed as a small-diameter piston-side hydraulic chamber operated by a second brake operator. The small diameter piston and the rear wheel brake are interlocked with the hydraulic fluid of the second hydraulic master cylinder.

According to the second aspect of the present invention, the independent brake system in which the large-diameter piston of the front-wheel disk brake operates by operating the first brake operating element and the front-wheel disk brake operating by operating the second brake operating element. This is a combination of an interlocking brake system in which the small diameter piston and the rear wheel brake interlock.

In the operation of only the independent brake system, the large-diameter piston is pushed out by the hydraulic fluid supplied to the large-diameter hydraulic chamber of the caliper body of the front disc brake, and the friction pad on the front surface of the large-diameter piston is removed. It is pressed against one side of the disk rotor. Large and small diameter hydraulic chambers and
Since the check valves are interposed between the second hydraulic master cylinder and the second hydraulic master cylinder, backflow of the hydraulic fluid from the hydraulic chamber side to the hydraulic master cylinder side does not occur. For this reason, the braking reaction force from the disk rotor generated by the operation of the large-diameter piston acts in the direction of the large-diameter piston, and the caliper body slides in the direction of the large-diameter piston. It is pressed to the other side. As described above, in the operation of only the independent brake system, a large braking force is applied to the front wheel disc brake by the operation of the large-diameter piston.

In the operation of only the interlocking brake system, the caliper body of the front wheel disc brake operates in a manner opposite to that of the above-described large-diameter piston. The rear wheel brake is interlocked with the power.

Further, when both the independent brake system and the interlocking brake system are operated, the small-diameter piston and the large-diameter piston press the respective friction pads against the side surface of the disk rotor, but the large-diameter piston is superior to the small-diameter piston. Since the braking reaction of the disk rotor acts on the piston, the caliper body slides in the direction of the large-diameter piston together with the small-diameter piston, and the pressing force due to the braking reaction of the large-diameter piston is added to the friction pad on the front of the small-diameter piston. Is done. As described above, in the operation of both the independent brake system and the interlocking brake system, a large braking force is applied to the front wheel disc brake by the operation of the large-diameter piston.

According to a third aspect of the present invention, a front wheel brake and a rear wheel brake of a bar handle vehicle are provided, and a caliper body is provided with a pair of cylinder holes opposed to both action portions provided on both sides of the disk rotor. A two-pot opposed disk brake, wherein a piston is accommodated in each of the cylinder holes, and each piston is hydraulically operated by hydraulic fluid supplied to a hydraulic chamber at the bottom of the cylinder hole; The pair of opposed pistons are formed to have different diameters, and each of the caliper bodies of the front wheel disc brake and the rear wheel disc brake is attached to a caliper bracket fixed to the vehicle body in the disc axial direction via a slide pin. It is slidably supported and has a caliper body for the front wheel disc brake and a caliper body for the rear wheel disc brake. One of the opposing hydraulic chambers is connected to a first hydraulic master cylinder that raises hydraulic fluid by operating a first brake operator, and a caliper body of a front wheel disc brake and a rear wheel are also connected. The other of the opposing hydraulic chambers of each of the caliper bodies of the disc brakes is connected to a second hydraulic master cylinder which pressurizes the hydraulic fluid by operating a second brake operating member, and each hydraulic chamber is connected to a corresponding one of the hydraulic chambers. The first hydraulic master cylinder or the second
A check valve is provided between the hydraulic master cylinder and the hydraulic master cylinder to allow the hydraulic fluid to flow only to the hydraulic chamber side.

According to the third aspect of the present invention, the front / rear wheel dual system in which the front wheel disc brake and the rear wheel disc brake are interlocked by any of the first brake operator and the second brake operator. It becomes an expression interlocking brake.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. The brake device 1 for a bar-handle vehicle is configured to operate the independent brake system 4 for independently operating the front wheel disc brake 3 by operating the first brake operator 2 and the second brake operator 5 It has an interlocking brake system 7 that operates in conjunction with the front wheel disc brake 3 and the rear wheel drum brake 6.

The front wheel disc brake 3 has a caliper body 10 connected to a first hydraulic master cylinder 11 integrated with the first brake operator 2 and a hydraulic pipe 12.
Similarly, a caliper body 10 includes a second hydraulic master cylinder 13 integrated with a second brake operator 5 and hydraulic pipes 14, 1.
5, a dual-system hydraulic disc brake that can brake the front wheels by any of the first and second brake operators 2, 5, and rotates together with a front wheel (not shown). Disk rotor 16, a caliper bracket 17 fixed to the vehicle body at one side of the disk rotor 16, and supported by the caliper bracket 17 via slide pins 18, 19, 19 so as to be slidable in the disk axial direction. And a pair of friction pads 2 opposed to each other with the disk rotor 16 interposed therebetween.
0 and 20.

The caliper body 10 has action portions 10a and 10b disposed on both sides of the disk rotor 16.
A large-diameter cylinder hole 2 opening to the disk rotor 16 side.
1 and a small-diameter cylinder hole 22 are opposed to each other, and a cup-shaped large-diameter piston 23 and a small-diameter piston 24 are liquid-tightly and movably inserted into the cylinder holes 21 and 22 via piston seals 25a and 25b. A pot-facing type is used, and in the present embodiment, the caliper body 10 is formed by a pair of halves of the action portions 10a and 10b and a half of a bridge portion 10c disposed across the outside of the disk rotor 16. The divided caliper bodies are divided into caliper halves 10d and 10e, and connection bolts 27 and 27 are screwed into the disc entrance and exit sides of the bridge portion 10c to be integrally connected.

A large-diameter hydraulic chamber 27 is defined between the bottom wall 10f of the large-diameter cylinder hole 21 and the large-diameter piston 23, and is defined between the bottom wall 10g of the small-diameter cylinder hole 22 and the small-diameter piston 24. A small diameter hydraulic chamber 28 is defined. Bottom wall 10f, 1
0 g, an input port 29 for connecting the hydraulic pressure pipes 12 and 15 and a liquid through hole 30 communicating with the hydraulic pressure chambers 27 and 28 are provided continuously. A check valve 31 and a residual pressure release valve 32 are provided in parallel.

Each of the friction pads 20, 20 has a large-diameter piston 23 through which a hanger pin 26 is inserted through an upper portion of each back plate 20a.
And a small-diameter piston 24 with a disk rotor 16 interposed therebetween. Caliper support arms 17a, 17a of a caliper bracket 17 are provided on both sides of the friction pads 20, 20, respectively.
The disk rotor 16 is disposed so as to straddle the outer periphery in the disk axial direction. Each of the caliper support arms 17a, 17a is formed in a cylindrical shape.
The slide pins 18, 19, 19 are inserted or engaged with the action portions 10a, 10b of the caliper body 10 sandwiching the caliper support arms 17a, 17a with the caliper support arms 17a, 17a so that the caliper body 10 can slide in the disk axis direction. Supported.

The check valve 31 and the residual pressure release valve 32 are
The opening end of the large-diameter processing hole provided in communication with the liquid through hole 30 is closed in a liquid-tight manner with a seal ball 33 or a seal plug 34 to form respective valve chambers 35 and 36, and a check valve is formed. 31 accommodates a spherical valve element 37 and a valve spring 38 using a compression coil spring, and a valve chamber 36 of the residual pressure release valve 32 accommodates a cylindrical free piston 39. Have been.

In the valve chamber 35 of the check valve 31, a valve seat 40 is provided on the side of the large-diameter hydraulic chamber 27 or the small-diameter hydraulic chamber 28, which is on the upstream side of the hydraulic fluid. Is disposed, and a valve spring 38 is contracted between the valve body 37 and the seal ball 33, and the valve body 37 is always seated on the valve seat 40 by the elastic force of the valve spring 38. I have.

The valve chamber 36 of the residual pressure release valve 32 is liquid-tightly divided into an upstream chamber and a downstream chamber by a lip seal 41 fitted on the outer periphery of the free piston 39 (in FIG. 1, the free piston). Reference numeral 39 is located at the upstream end of the liquid passage hole 30, and the downstream chamber has the maximum volume, while the upstream chamber has disappeared.) The upstream chamber of the valve chamber 36 is
Communicates with the input port 29 via the upstream side of the liquid through hole 30;
The downstream chamber of the valve chamber 36 communicates with the large-diameter hydraulic chamber 27 or the small-diameter hydraulic chamber 28 via the downstream side of the liquid communication hole 30 and the valve chamber 35 of the check valve 31. With the movement, the volumes of the upstream chamber and the downstream chamber of the valve chamber 36 expand and contract in inverse proportion.

The movement of the above-mentioned free piston 39 is caused by a hydraulic fluid pressure lower than a predetermined hydraulic fluid pressure for operating the valve element 37 of the check valve 31 and the large-diameter hydraulic chamber 27 on the downstream side after the brake is released.
Alternatively, the operation is performed by the residual hydraulic pressure that recirculates from the small-diameter hydraulic pressure chamber 28.
The movement in the direction of the downstream chamber is set so as to stop in a range where the liquid passage hole 30 on the downstream side that opens to the downstream chamber is not completely closed.

When the check valve 31 is not operated, the valve body 37 is seated on the valve seat 40 by the resilience of the valve spring 38, and the check valve 31 is in a closed state. Further, in the residual pressure release valve 32 at the time of non-operation, the free piston 39 is driven by the residual hydraulic pressure returned from the hydraulic chambers 27 and 28 on the downstream side to the downstream chamber of the valve chamber 36 so that the upstream end of the valve chamber 36 is closed. In place of the upstream chamber having disappeared, a capacity for accommodating residual hydraulic pressure in the hydraulic chambers 27 and 28 on the downstream side is secured in the downstream chamber.

First and second hydraulic master cylinders 11 and 13
When the hydraulic fluid pressurized in step (1) is sent to the front wheel disc brake 3 and supplied from the input port 29 of the caliper body 10 to the upstream side of the fluid communication hole 30, the free piston 39 of the residual pressure release valve 32 The valve chamber 36 is moved from the position shown in FIG. 1 toward the downstream chamber by the hydraulic fluid pressure set lower than that of the check valve 31, and the hydraulic fluid in the downstream chamber is moved to the large-diameter hydraulic chamber 27 on the downstream side.
Alternatively, it is supplied to the small-diameter hydraulic chamber 28. Thereby, an upstream chamber is formed in the valve chamber 36 of the residual pressure release valve 32, and the free piston 39 gradually expands as it moves toward the downstream chamber.

When the hydraulic fluid pressure on the upstream side of the fluid communication hole 30 gradually increases and a predetermined hydraulic fluid pressure higher than the set load of the valve spring 38 is applied to the valve body 37 of the check valve 31, the valve body 37 , Compresses the valve spring 38 and opens the valve away from the valve seat 40, and the hydraulic fluid upstream of the check valve 31 is supplied to the hydraulic chambers 27 and 28 also downstream of the check valve 31. The pistons 23 and 24 push the cylinder holes 21 and 22 toward the opening while elastically deforming the piston seals 25a and 25b.

When the above operation is released, the pistons 23 and 24 return the cylinder holes 21 and 22 toward the bottom wall while reducing the hydraulic pressure chambers 27 and 28 by the restoring force of the piston seals 25a and 25b. As a result, the valve body 37 of the check valve 31 released from being pressed by the hydraulic fluid is seated on the valve seat 40 by the resilience of the valve spring 38, and the communication between the upstream side and the downstream side of the liquid through hole 30 is cut off. You.

In the residual pressure release valve 32, the piston 2 on the downstream side
3 and 24 return the cylinder holes 21 and 22 toward the bottom wall, whereby the residual hydraulic pressure from the hydraulic chambers 27 and 28 is returned to the downstream chamber of the valve chamber 36, and the free piston 39 is moved to the valve chamber 36.
Move toward the upstream room. When the free piston 39 is located at the upstream end of the valve chamber 36, the valve chamber 3
6 disappears, and the hydraulic chamber 2 is located downstream of the valve chamber 36.
7,28 residual hydraulic pressures are accommodated.

The rear wheel drum brake 6 is provided with a pair of arcuate brake shoes 51, 51 opposed to the inside of a back plate 50 by rotating a cam shaft 52 to anchor pins 53.
A mechanical drum brake that expands at a fulcrum is used. A base end of an operating lever 54 is fixed to the cam shaft 52, and a wire cable 55 is connected to a distal end of the operating lever 54. The hydraulic pipe 14 connected to the second hydraulic master cylinder 13 is branched into a hydraulic pipe 15 for a front wheel brake and a hydraulic pipe 56 for a rear wheel brake. And a cable actuator 60 is interposed therebetween.

The cable actuator 60 converts the hydraulic operating force of the second hydraulic master cylinder 13 supplied through the hydraulic pipes 14 and 56 into mechanical traction, and operates the drum brake 6 for the rear wheels. The large-diameter portion 63a and the medium-diameter portion 63b of the traction piston 63 are housed in a cylinder hole 62 provided with one end of the cylinder body 61 communicating with the atmosphere by the operating force conversion means. An air chamber 64 is defined between one end wall of the cylinder hole 62 and a hydraulic chamber 65 is defined on the outer periphery of the middle diameter portion 63b.

A return spring 66 is contracted between the large-diameter portion 61a and one end wall of the cylinder hole 62, and the retraction force of the return spring 66 causes the traction piston 63 to move toward the other end of the cylinder body 61. The wire cable 55 is connected to the small-diameter rod 63c of the traction piston 63 that projects from the other end of the cylinder body 61,
The hydraulic piping 56 is connected to an input port 67 communicating with the hydraulic chamber 65.

The brake device 1 for a bar-handle vehicle according to the present embodiment is configured as described above. When only the independent brake system 4 is operated alone, the gripping operation of the first brake operator 2 is performed. Thus, the hydraulic fluid pressurized by the first hydraulic master cylinder 11 is sent to the caliper body 10 of the front wheel disc brake 3 through the hydraulic pipe 12.

The hydraulic fluid sent to the caliper body 10 is
The check valve 31 and the residual pressure release valve 32 are operated as described above from the input port 29 of the action portion 10a on the vehicle body mounting side through the liquid through hole 30, and the check valve 31 is opened and the valve chamber 35 is opened. It is supplied to the large-diameter hydraulic chamber 27. Large diameter hydraulic chamber 27
The hydraulic fluid supplied to the large-diameter piston 23 pushes the large-diameter piston 23 in the direction of the opening of the large-diameter cylinder hole 21 and the friction pad 2
0 is pushed to bring the lining 20b into sliding contact with one side surface of the disk rotor 16. In this operation, the other friction pad 20 is not pushed by the small-diameter piston 24, the check valve 31 on the small-diameter piston 24 side is closed, and the second hydraulic master cylinder 13 is moved from the small-diameter hydraulic chamber 28 side.
There is no backflow of hydraulic fluid to the side.

By this sliding contact, a braking reaction force having the same magnitude as the pressing force of the large-diameter piston 23 acts on the caliper body 10 in the direction of the large-diameter piston 23 from the disk rotor 16 through one friction pad 20. Caliper body 1
0 slides in the direction of the large-diameter piston 23 under the guidance of the slide pins 18, 19, 19, so that the hydraulic fluid in the small-diameter hydraulic chamber 28 is more pressurized than the hydraulic fluid in the large-diameter hydraulic chamber 27, and the small-diameter piston 24 Presses the other friction pad 20 with the same high pressing force as the large-diameter piston 23, and the front wheels are braked.

In the case where only the interlocking brake system 7 is operated alone, the second brake operation member 5 is operated to hold the second
Part of the hydraulic fluid pressurized by the hydraulic master cylinder 13
The hydraulic fluid is sent to the caliper body 10 of the front wheel disc brake 3 through the hydraulic pipes 14 and 15, and the remaining hydraulic fluid of the second hydraulic master cylinder 13 is passed through the hydraulic pipes 14 and 56 to the rear wheel brake cable actuator 60. Sent to

The hydraulic fluid sent to the caliper body 10 is
The check valve 31 and the residual pressure release valve 32 are operated as described above from the input port 29 of the action portion 10b on the side opposite to the vehicle body through the liquid through hole 30, and the check valve 31 is opened to open the valve chamber 35. Is supplied to the small-diameter hydraulic chamber 28. Small-diameter hydraulic chamber 2
The hydraulic fluid supplied to 8 pushes the small-diameter piston 24 in the direction of the opening of the small-diameter cylinder hole 22, and pushes the other friction pad 20 to bring the lining 20 b into sliding contact with the other side surface of the disk rotor 16. In this operation, the friction pad 20 is not pushed by the large-diameter piston 23, the check valve 31 on the large-diameter piston 23 side is closed, and the first hydraulic master cylinder is moved from the large-diameter hydraulic chamber 27 side. 11
There is no backflow of hydraulic fluid to the side.

By the above-mentioned sliding contact, a braking reaction force having the same magnitude as the pressing force of the small-diameter piston 24 is applied to the caliper body 10 from the disk rotor 16 to the other friction pad 20 in the direction of the action portion 10b on the side opposite to the vehicle body mounting side. And the caliper body 10 slides toward the small-diameter piston 24 under the guidance of the slide pins 18, 19, 19, so that the hydraulic fluid in the large-diameter hydraulic chamber 27 is lower than the hydraulic fluid in the small-diameter hydraulic chamber 28. The pressure is increased, and the large-diameter piston 23 presses one of the friction pads 20 with the same low pressing force as the small-diameter piston 24, whereby the front wheels are braked.

On the other hand, the remaining hydraulic fluid of the second hydraulic master cylinder 13 sent to the cable actuator 60 is supplied from the input port 67 to the hydraulic chamber 65, and the large-diameter portion 63 a of the traction piston 63 is moved to the atmosphere chamber 64. Direction to pull the small diameter portion 63c into the cylinder body 61,
The wire cable 55 connected to 3c is pulled.
A rear wheel brake wire cable 55 towed by the towing piston 63 causes the operating lever 54 to rotate together with the camshaft 52, and the rotation of the camshaft 52 causes the brake shoes 51, 51 to pivot about the anchor pin 53. The rear wheels are expanded to brake the rear wheels.

In the operation of both the independent brake system 4 and the interlock brake system 7, the hydraulic fluid of the first and second hydraulic master cylinders 11, 13 is sent to the caliper body 10 of the front wheel disc brake 3. Then, a part of the hydraulic fluid of the second hydraulic master cylinder 13 is sent to the rear wheel brake cable actuator 60.

The hydraulic fluid sent to the caliper body 10 is
From each of the input ports 29 of the action portions 10a and 10b,
0, and is supplied to the large-diameter hydraulic chamber 27 and the small-diameter hydraulic chamber 28, and pushes the large-diameter piston 23 and the small-diameter piston 24 toward the openings of the respective cylinder holes 21 and 22, and the pistons 21 and 22 move forward. The friction pads 20, 20 are pushed to bring the linings 20b, 20b into sliding contact with both side surfaces of the disk rotor 16.

The hydraulic fluid supplied to the hydraulic chambers 27, 28
Since the check valves 31 are interposed in the respective fluid communication holes 30, 30, there is no backflow from the hydraulic chambers 27, 28 to the hydraulic master cylinders 11, 13. When the friction pads 20, 20 are pushed by the pistons 23, 24, the pressure receiving area is larger than that of the small-diameter piston 24, and the large-diameter piston 23, which has a large pressing force on the friction pad 20,
The braking reaction force from the disk rotor 16 is reduced by the small-diameter piston 24.
Acts more than Thereby, the large-diameter piston 23
The braking reaction force is applied to the large-diameter piston 23 side of the caliper body 10 by the difference between the braking reaction force of the caliper body 10 and the braking reaction force of the small-diameter piston 24 side. Of one working part 10
Sliding in the direction a, the small-diameter hydraulic chamber 28 is contracted to increase the pressure of the hydraulic fluid in the small-diameter hydraulic chamber 28.

When the hydraulic fluid in the small-diameter hydraulic chamber 28 rises in pressure higher than the hydraulic fluid from the second hydraulic master cylinder 13, the check valve 31 on the small-diameter piston 24 side is closed,
The hydraulic fluid in the small-diameter hydraulic chamber 28 is higher than the hydraulic fluid in the large-diameter hydraulic chamber 27, and the small-diameter piston 24 presses the other friction pad 20 with the same pressing force as the large-diameter piston 23, and The front wheel is braked by sliding the 20b on the other side of the disk rotor 16.

As described above, in the present embodiment, the two-pot opposed caliper body 10 is employed for the front wheel disc brake 3 and the caliper body 10 is moved in the disc axial direction by the slide pins 18, 19, 19. So that the liquid passage holes 3 communicating with both the hydraulic chambers 27 and 28 can be slid.
The disc brake 3 can be a two-system brake with a simple structure in which only the check valves 31 are interposed at 0 and 30, respectively.

Therefore, compared to a conventional product using a multi-pot caliper body of at least four or more pots,
The size and weight of the disc brake 3 can be reduced, and the unsprung load can be reduced. Also, compared to the conventional product using two parallel pots on one side, the caliper body 1
Since the zero is not tilted by the unbalanced load, the slidability of the caliper body 10 is not impaired, and the lining 20b of the friction pad 20 is not unevenly worn.

Further, in the present embodiment, a large-diameter piston 23 and a small-diameter piston 24 are provided on the caliper body 10 of the front wheel disc brake 3 so as to face each other. Large diameter piston 23
To increase the braking effect of the front wheel disc brake 3 to ensure sufficient braking force for the bar-handled vehicle. In the independent operation of the interlocking brake system 7, the small-diameter piston 24 having a small pad pressing force is actuated. Disc brake 3
In this case, the braking effect is suppressed and the rear wheel drum brake 6 is interlocked, so that a well-balanced braking can be applied to the front and rear portions of the vehicle body of the bar handle vehicle.

FIG. 3 shows a second embodiment of the present invention. A brake device 70 for a bar-handle vehicle according to the present embodiment includes a disc brake 71 for a front wheel and a disc brake 72 for a rear wheel. It is a combination of two first interlocking brake systems 73 and second interlocking brake systems 74 that are interlocked with the operation of the brake operator 2 and the second brake operator 5, respectively.

Each of the disc brakes 71, 72 has a pair of caliper halves 10d, 10 as in the first embodiment.
e, and a first interlocking brake system 7 connected to the first hydraulic master cylinder 11 of the first brake operator 2 using a two-pot opposed caliper body 10 made of
The third hydraulic pipe 75 is connected to the input port 29 on the large-diameter piston side of the front-wheel caliper body 10 and the input port 29 on the small-diameter piston side of the rear-wheel caliper body 10.
The second hydraulic master cylinder 1 of the second brake operator 5
Hydraulic piping 76 of the second interlocking brake system 74 connected to 3 is connected to the input port 29 on the small-diameter piston side of the caliper body 10 for the front wheels and the input port 29 on the large-diameter piston side of the caliper body 10 for the rear wheels. It is connected.

The hydraulic fluid supplied to each input port 29 is:
The pistons 23 and 24 are operated in the same manner as in the first embodiment to brake the front wheels and the rear wheels. When only the first interlocking brake system 73 is operated alone, a large braking force is generated by the large-diameter piston 23 on the front-wheel disk brake 71, and the small-diameter piston 24 is used on the rear-wheel disk brake 72. This is an interlocking brake that emphasizes front wheels and generates a small braking force. Also, the second interlocking brake system 74
In the single operation of only the rear wheels, a small braking force using the small-diameter piston 24 is generated in the disk brake 71 for the front wheels, and a large braking force is generated using the large-diameter piston 23 in the disk brake 72 for the rear wheels. It becomes an interlocking brake. Furthermore, in the operation of both the first and second interlocking brake systems 73 and 74, both the front and rear wheel disk brakes 71 and 72 are interlocking brakes using the large-diameter piston 23 and having a large braking force. .

As described above, in this embodiment, both the front and rear wheel-oriented braking can be performed by using the first and second interlocking brake systems 73 and 74 independently. By using the two interlocking brake systems 73 and 74 simultaneously, a large braking force by the large-diameter piston 23 can be applied to the front and rear wheels. Suitable usage is possible according to the preference of the user.

Further, in this embodiment, the valve springs 38 used for the check valve 31 of the front wheel disc brake 3 and the check valve 31 of the rear wheel disc brake 3 in the first and second interlocking brake systems 73 and 74, respectively. , 38 with different set loads, check valve 3 for front and rear wheels
By changing the valve opening pressures of the valves 1 and 31, one of the front wheel disc brakes 3 and the rear wheel disc brakes 3 can be used as a preceding brake that operates before the other.

In this embodiment, the caliper bodies 10 and 10 for the front and rear wheels are respectively provided with a caliper half 10d having a large-diameter cylinder hole 21 and a caliper half 10e having a small-diameter cylinder hole 22. In combination, the large diameter side of the front wheel caliper body 10 and the small diameter side of the rear wheel caliper body 10 are linked, and the small diameter side of the front wheel caliper body 10 and the large diameter side of the rear wheel caliper body 10 are linked. However, the interlocking relationship may be set opposite to that of the second embodiment.

The combination of the caliper halves 10d and 10e makes it possible to impart various braking characteristics to the bar-handled vehicle. For example, the caliper body 10 may be composed of caliper halves 10d having a large-diameter cylinder hole 21 and applied to one or both of the front and rear wheel disc brakes, or a small-diameter cylinder hole. Caliper halves 10e, 10 with 22
The caliper body 10 may be constituted by the members e, and may be applied to one or both of the front and rear wheel disc brakes.

[0055]

As described above, according to the first aspect of the present invention,
According to the configuration described above, the two-pot opposed caliper body can be used for the disc brake operated by the two brake systems, so that the conventional product that requires a multi-pot caliper body of at least four or more pots is required. In comparison, the size and weight of the disc brake can be reduced and the unsprung load of the vehicle body can be reduced. Also, compared to the conventional product using two pots on one side in parallel for the caliper body, the caliper body is not tilted by an uneven load, so that the slideability of the caliper body is impaired and the lining of the friction pad is unevenly worn. Disappears.

According to the second aspect of the present invention,
In the operation of the first brake operator, the braking effect of the front wheel disc brake is increased to secure a sufficient braking force in the bar handle vehicle, and in the operation of the second brake operator, the braking effect of the front wheel disc brake is increased. Since the interlocking is performed mainly by the rear wheel brake while suppressing, the well-balanced braking can be applied to the front and rear portions of the body of the bar handle vehicle.

Further, according to the configuration of claim 3 of the present invention,
The front wheel disc brake and the rear wheel disc brake are actuated in conjunction with either the first brake operator or the second brake operator, and the large brake is applied to either the front wheel disc brake or the rear wheel disc brake. It is possible to freely set the braking force distribution to the front and rear wheels, such as by giving a braking force, so that it is suitable for the characteristics, weight distribution, application, driving situation, rider's preference, etc. of the bar handle vehicle. Usage becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a brake device for a bar handle vehicle showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view of a caliper body showing a first embodiment of the present invention.

FIG. 3 is a schematic diagram of a brake device for a bar handle vehicle showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Brake device for bar handle vehicles 2 ... 1st brake operator 3 ... Disc brake for front wheels 4 ... Single system brake system 5 ... 2nd brake operator 6 ... Drum brake for rear wheels 10 ... Caliper body 11 ... 1st hydraulic master cylinder 12, 14, 15, 56 ... hydraulic piping 13 ... 2nd hydraulic master cylinder 16 ... disk rotor 17 ... caliper bracket 18, 19, 19 ... slide pin 20 ... friction pad 10a, 10b ... action Part 10d, 10e ... Caliper half 21 ... Large diameter cylinder hole 22 ... Small diameter cylinder hole 23 ... Large diameter piston 24 ... Small diameter piston 27 ... Large diameter hydraulic chamber 28 ... Small diameter hydraulic chamber 29 ... Input port 30 ... Liquid through hole DESCRIPTION OF SYMBOLS 31 ... Check valve 32 ... Residual pressure release valve 35, 36 ... Valve room 40 ... Valve seat 51 ... Brake shoe 52 ... Cam shaft 54 ... Operating lever 55 ... wire cable 60 ... cable actuator 61 ... cylinder body 62 ... cylinder hole 63 ... traction piston 65 ... hydraulic chamber 67 ... input port 70 ... brake device for bar handle vehicle 71 ... disc brake for front wheel 72 ... for rear wheel Disc brake 73: first interlocking brake system 74: second interlocking brake system 75, 76: hydraulic piping

Claims (3)

[Claims] 1. A disc brake caliper body,
An operation in which a pair of cylinder holes are opposed to both working portions disposed on both sides of the disk rotor, pistons are accommodated in each of the cylinder holes, and each piston is supplied to a hydraulic chamber at the bottom of the cylinder hole. A two-pot opposed type that is hydraulically operated with liquid, and the caliper body is supported on a caliper bracket fixedly mounted on the vehicle body via a slide pin so as to be slidable in the disk axis direction. One of them is connected to a first hydraulic master cylinder that pressurizes hydraulic fluid by operating a first brake operator, and the other hydraulic chamber is pressurized to increase hydraulic fluid by operating a second brake operator. Check that the hydraulic fluid is allowed to flow only to the hydraulic chamber side between each hydraulic chamber and either the first hydraulic master cylinder or the second hydraulic master cylinder connected to the two hydraulic master cylinders. Intermediate valve Bar handle vehicle for the dual brake system. 2. A large-diameter piston in which the disc brake is a front wheel brake, the opposed pair of pistons are formed to have different diameters, and one of the hydraulic chambers is operated by the first brake operator. And the other hydraulic chamber is formed as a hydraulic chamber on the side of the small-diameter piston operated by the second brake operating element, and is reduced in diameter by the hydraulic fluid of the second hydraulic master cylinder. The dual system brake device for a bar handle vehicle according to claim 1, wherein the piston and the rear wheel brake are interlocked. And a caliper body having a pair of cylinder holes opposed to both working portions disposed on both sides of the disk rotor, wherein a pair of cylinder holes are opposed to each other. Each of the pistons is housed, and each piston is a two-pot opposed type disc brake that is hydraulically operated by a hydraulic fluid supplied to a hydraulic chamber at the bottom of the cylinder hole, and a pair of opposed pistons of the caliper body are used. Formed with different diameters, each of the caliper bodies of the front wheel disc brake and the rear wheel disc brake is supported on a caliper bracket fixed to the vehicle body via a slide pin so as to be slidable in the disc axis direction, Hydraulic chambers facing each other in the caliper body of the front wheel disc brake and the caliper body of the rear wheel disc brake Are connected to a first hydraulic master cylinder that raises hydraulic fluid by operating a first brake operator, and a caliper body of a front wheel disc brake and a caliper body of a rear wheel disc brake, respectively. The other of the hydraulic chambers facing each other is connected to a second hydraulic master cylinder that raises the hydraulic fluid by operating a second brake operator, and each hydraulic chamber is connected to a first hydraulic master cylinder connected thereto. Alternatively, a two-branch brake device for a bar handle vehicle, in which a check valve is provided between the second hydraulic master cylinder and the second hydraulic master cylinder to allow the flow of the hydraulic fluid only to the hydraulic chamber side.