JPH10175533A - Front and rear wheels interlocking brake device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front and rear wheels interlocking brake device for a motorcycle to perform optimum brake control by providing both the antiblock function of a front wheel and the interlocking brake function of front and rear wheels. SOLUTION: A front and rear wheels interlocking brake device for a motorcycle comprises a first brake system 24 to simultaneously operate a front disc brake 12 and a rear drum brake through operation of a left brake lever 22; and a second brake system 26 to operate only the front disc brake 12 through operation of a right brake lever 20. Brake hydraulic control parts 28 and 30 having an antiblock brake function to prevent lock of respective wheels are interposed between the first and second brake systems 24 and 26. The brake hydraulic control parts 28 and 30 has an independent hydraulic circuit consisting of the first and second brake systems 24 and 26 and are provided with hydraulic pump units 32 and 34 to boost respective brake oil pressures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter-type brake system for a front and rear wheel of a motorcycle having a light displacement and hydraulic brake system.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Publication No. 3-60701 discloses a front and rear wheel interlocking brake device for a motorcycle. In this interlocking brake device, as shown in FIG. 5, brake units c and d for front wheels and rear wheels are connected to a single master cylinder b that generates pressure by an acting force on a brake pedal a. The front and rear wheels are braked by supplying hydraulic pressure to the brake units c and d for the front and rear wheels. At this time, a braking force is applied by a control valve (not shown) according to the rotational speed of the front and rear wheels. And the proportioning valve e performs the proportioning function of changing the braking force of the front and rear wheels at a predetermined ratio.

In the interlocking brake device shown in FIG. 5, the front wheel brake unit c is of an opposed piston type, and is a double disc brake disposed on the left and right sides of the front wheel.
One of the disk brake units is a brake unit c1 of the interlocking brake device.
Therefore, in the conventional interlocking brake device,
A single control valve controls the front and rear wheel brake pressures,
A proportioning valve distributes brake pressure to the front and rear wheel brakes at a predetermined ratio.

The other disc brake unit c
Reference numeral 2 denotes a normal brake unit c2 for generating hydraulic pressure from the front master cylinder h by operating the brake lever g of the handle f to move the brake piston j of the caliper i forward and backward. Therefore, there is only one set of control valves for the antilock function for the brake unit c1, and the brake unit c2 is a control system for the front wheels only, and is not provided with the antilock function. In FIG. 5, reference symbol k denotes a disk pad, and m denotes a disk. The one disk brake unit c1 and the rear wheel (rear) disk brake unit d have the same configuration as the other brake unit c2, and are denoted by the same reference numerals.

[0005]

However, in the interlocking brake device, since the brake pressure of the front wheel and the rear wheel is not independently controlled by the control valves, the brake pressure changes due to a change in braking deceleration or a change in road surface conditions. When either the front wheel or the rear wheel is locked, the brake pressure on the other side is also reduced, so that there is a problem that the braking distance becomes longer.

Further, when the front wheel brake is a double disc as shown in FIG. 5, it is good, but when the front wheel brake is a single disc, a 6 piston type disc brake is required as shown in FIG. In the disk brake shown in FIG. 6, the front disk brake n and the rear disk brake o are calipers n1 and o1 of 6 pods, respectively.
And the pistons n2 and o2. The hydraulic pressure from the front master cylinder h acts on the two pairs of pistons and operates the rear disc brake o via the front proportional valve p to simultaneously brake the front and rear wheels. I do.
The hydraulic pressure from the rear master cylinder b is supplied to the rear disc brake o by the rear brake pedal a and also supplied to the front disc brake n via the rear proportional valve q to brake the front and rear wheels simultaneously. However, as described above, the six-piston type disk brake increases costs because it avoids uneven wear and the like of the pad by changing the size.

In addition, the pressure distribution between the front and rear wheels of the interlocking brake uses a mechanical valve that varies depending on the pressure ratio of the hydraulic diameter, and therefore cannot be variably and finely controlled. Furthermore, the 6-piston rear caliper can be used in terms of size for models such as large cars, but it is difficult to use a small-sized wheel such as a scooter because of its diameter and size. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can exhibit optimum brake control by exhibiting both an anti-lock function of a front wheel and an interlocking brake function of a front wheel and a rear wheel. It is an object of the present invention to provide a front and rear wheel interlocking brake device for a motorcycle.

[0009]

The present invention has the following arrangement to solve the above-mentioned problems. The invention according to claim 1 is a motorcycle provided with a first brake system for simultaneously braking the front wheels and the rear wheels and a second brake system for braking only the front wheels, wherein the first and second brake systems are respectively provided. A hydraulic pump unit that interposes an anti-lock brake device that prevents locking of wheels, forms an independent hydraulic circuit with a first brake system and a second brake system, and increases each brake hydraulic pressure The front and rear wheel brakes of the first brake system are provided with control valves for controlling the supply and discharge of hydraulic pressure, respectively.

According to the first aspect of the present invention, the first brake system and the second brake system are each provided with an anti-lock brake device for preventing wheel lock, and the anti-lock brake device comprises a first brake system. And an independent hydraulic circuit formed by the second brake system and a hydraulic pump unit for increasing the respective brake hydraulic pressure.
The antilock operation can be independently performed in both the brake system and the second brake system, and the brake hydraulic pressure can be optimally controlled.

The front brake and the rear wheel brake of the first brake system are provided with control valves for controlling the supply and discharge of hydraulic pressure, respectively. Therefore, when the front and rear wheels are interlocked, either the front wheel or the rear wheel is required. When the vehicle locks, the brake pressure on the other side does not decrease, and the braking distance does not increase.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 to FIG. 4 are explanatory diagrams of a front and rear wheel interlocking brake device mounted on a scooter type motorcycle according to the embodiment.

As shown in FIG. 1, a motorcycle is provided with a front disc brake 12 comprising a disc 12a and a caliper 12b on a front wheel 10, and a rear drum brake comprising a lever 16a, a brake drum 16b and the like on a rear wheel 14. 16 are provided.

As shown in FIGS. 1 to 3, in the front and rear wheel interlocking brake device, the handle 18 is provided with brake levers 20 and 22 on the right and left sides, respectively. A first brake system 24 that simultaneously activates the front disc brake 12 and the rear drum brake 16 to simultaneously brake the front wheel 10 and the rear wheel 14, and operates only the front disc brake 12 by operating the right brake lever 20 to operate the front wheel 1
A second brake system 26 that brakes 0 is provided.

The first brake system 24 and the second brake system 26 each include a brake hydraulic control unit 2 having an anti-lock brake function for preventing wheel lock.
8 and 30, and brake hydraulic control units 28 and 3
No. 0 includes hydraulic pump units 32 and 34 which form an independent hydraulic circuit by the first brake system 24 and the second brake system 26 and increase the respective brake hydraulic pressures.

A brake hydraulic pressure control unit 28 of the first brake system 24 controls the supply and discharge of hydraulic pressures of the front disc brake 12 and the rear drum brake 16 to timely distribute the pressure distribution between the front disc brake 12 and the rear drum brake 16. Can be controlled.

(Front Disc Brake Mechanism) In the front disc brake 12, as shown in FIGS. 3 and 4, four pistons 12c... 4 pods (with 4 pods connected)
The pair of pistons 12c, 12c belong to the first brake system 24, and the other pair of pistons 12c, 12c belong to the second brake system 26. FIG. 3 is a plan sectional view, and FIG. 4 is a front sectional view. A pad 1 that slides on the brake disc 12a is provided at each end of the piston 12c.
2d are provided respectively. Note that the front brake 12 is independently braked by operating the lever 20 and the lever 22 is braked.
Operation of the front and rear brakes 12, 1
When the braking force setting at the time of the interlocking braking of No. 6 is different, each pair of brake pistons 12c, 12c and 12c,
A difference can be provided in the diameter of 12c.

(Brake Operating Mechanism by Right Brake Lever) The right brake lever 20 operates the brake oil pressure to control the brake oil pressure by the brake oil pressure control unit 3 of the second brake system 26.
0 is provided,
In the brake hydraulic pressure control unit 30, a one-way valve (return check) is provided between the master cylinder 36 and an oil feed line 40 connected to the pods of the pair of pistons 12c, 12c of the front disc brake 12 from the pump 34a of the hydraulic pump unit 34 Valve 42).

In the middle of the oil supply line 40, the line 40
Is open (hereinafter referred to as “ON”) / closed (hereinafter “OFF”)
The solenoid valve 44 for oil supply is provided on the disc brake 12 side of the solenoid valve 44 of the pipe line 40, and a return pipe line 48 branching toward the reserve tank 46 is provided. A return oil solenoid valve 50 for turning ON / OFF the return line 48 is provided in the middle of the return line 48. The return line 48 is provided together with the reserve tank 46 with a hydraulic pump unit via a one-way valve 52. 34 is connected to the pump 34a suction side. The oil supply solenoid valve 44 has a pressure valve 5 that is bypassed in the return direction in parallel.
4 is connected to the pressure valve 54, so that when the right lever 20 is returned, the pressure is released immediately and the oil returns to the master cylinder 36.

(Brake operation mechanism by left brake lever 22) The left brake lever 22 is provided with a master cylinder 38 for sending brake oil pressure to the brake oil pressure control unit 28 of the first brake system 24 by operating the same. In the section 28, the discharge side of the pump 32 a of the hydraulic pump unit 32 is connected to an oil feed pipe 58 that connects the master cylinder 38 to the rear piston cylinder 56 for operating the rear drum brake 16 via a one-way valve (check valve) 60. Connected.

In the middle of the oil supply line 58, the line 58
An oil feed solenoid valve 62 for turning ON / OFF the oil supply valve is provided. A return pipe 66 branching toward a reserve tank 64 is provided on the side of the solenoid valve 62 of the pipe 58 on the side of the rear piston cylinder 56. A return oil solenoid valve 68 for turning ON / OFF the return line 66 is provided in the middle of the return line 66. The return line 66 is provided together with the reserve tank 64 with a hydraulic pump unit via a one-way valve 70. 32 are connected to the suction side of the pump 32a.

Further, another pair of pistons 12c, 1
An oil feed line 72 connected to the pod 2c is connected in common with an oil feed line 58 that connects the discharge side of the pump 32a of the pump unit 32 to the rear piston cylinder 56. 72 ON / OFF
An oil supply solenoid valve 74 is provided, and a return pipe 76 branching toward the reserve tank 64 is provided on the side of the solenoid valve 74 of the pipe 72 on the side of the front disc brake 12. A return oil solenoid valve 78 for turning ON / OFF the return line 76 is provided in the middle of the return line 76. The return line 76 is provided together with the reserve tank 64 with the one-way valve 70.
It is connected to the entry side.

The oil feeding solenoid valve 62,
Pressure valves 80 and 82 are connected to the valve 74 in parallel, respectively. The pressure valves 80 and 82 are connected to the master cylinder 38 by the pressure immediately after the left lever 22 is returned. They return quickly.

(Operation mechanism of rear drum brake 16 by rear piston cylinder 56) Rear drum brake 1
6, a shoe (not shown) is pressed against the inner peripheral surface of the drum 16b to brake the rear wheel 14. The rear brake cam lever 16a, which is driven to press the shoe, has a wire cable 8 connected to a rod 56a of a rear piston cylinder 56.
0, and this cable 80
6 is transmitted to the rear brake cam lever 16a.
For example, a bode wire can be used as the wire cable 80, and both ends are supported by a vehicle body side stopper 82 and a swing arm side stopper 84. The mounting position of the rear brake cam lever of the wire cable 80 can be adjusted by an adjuster screw 86. The wire cable is an example, and the rear brake cam lever 1
6a is a rod-shaped body (rod), and the rear piston cylinder 56
May be connected.

In addition to the above, a speed sensor is provided for each of the front wheel 10 and the rear wheel 14, and an electronic control unit (and an interface such as a relay) (not shown) according to their signals and programs stored in advance.
, Each solenoid valve 44, 50, 62, 68, 7
4, 78 and the pump units 32 and 34 are controlled to perform an antilock brake function and a front and rear wheel interlocking brake function.

Next, the operation of the front and rear wheel interlocking brake device of the embodiment will be described. When the rider of the motorcycle operates the right brake lever 20, the hydraulic pressure from the master cylinder 36 is transmitted through the oil supply pipe 40 to the front disc brake 1.
The front wheels are braked by operating the pair of pistons 12a, 12a. At this time, when the front wheel lock is detected from the speed difference between the wheel speeds of the front wheel 10 and the rear wheel 14, the brake hydraulic control unit 30 of the second brake system 26 operates the anti-lock brake.

That is, when the lock of the front wheel 10 is detected, the solenoid valve 44 is turned off and the solenoid valve 50 is turned on, the brake pressure of the front disc brake 12 is released, and the contact force of the front wheel 10 is restored. Then, the solenoid valve 44 is turned on and the solenoid valve 50 is turned off,
The hydraulic pressure of the hydraulic pump unit 34 is
And the anti-lock brake operation of recovering the braking force is repeated. O of each solenoid valve 44, 50
The antilock brake operation can be set at the timing of N / OFF switching.

Therefore, the anti-lock brake can be operated when only the front wheels are braked by operating the right brake lever 20.

When the occupant of the motorcycle operates the left brake lever 22, the hydraulic pressure from the master cylinder 38 is transmitted via the oil supply line 72 to the front disc brake 1.
The other pair of pistons 12a, 12a is operated to brake the front wheel 10. An operating oil pressure is supplied to the rear piston cylinder 56 via an oil supply line 58 communicating with the oil supply line 72. The distribution of the braking force between the front wheel 10 and the rear wheel 14 can be variously determined by changing the settings of the pistons 12c and 12c of the front disc brake 12 and the drum diameter of the rear drum brake 16.

At this time, when front wheel lock is detected from a difference in wheel speed between the front wheel 10 and the rear wheel 14, the brake hydraulic control unit 28 of the first brake system 24 operates an anti-lock brake. That is, when the lock of the front wheel 10 is detected, the solenoid valve 74 is turned off and the solenoid valve 78 is turned on, the brake pressure of the front disc brake 12 is released, and if the ground force of the front wheel 10 is restored, Turn on solenoid valve 74
Then, the solenoid valve 78 is turned off, and the anti-lock brake operation of supplying the oil pressure of the hydraulic pump unit 32 to the disk brake 12 to recover the braking force is repeated.

When the rear wheel lock is detected, the first brake system 24 brake hydraulic control unit 28 operates the anti-lock brake. That is, when the lock of the rear wheel 14 is detected, the solenoid valve 62 is turned off and the solenoid valve 68 is turned on, the brake pressure of the rear drum brake 16 is released, and if the ground force of the rear wheel 14 is restored. , The solenoid valve 62 is turned on and the solenoid valve 68 is turned off, and the hydraulic pressure of the hydraulic pump unit 32 is
And the anti-lock brake operation of recovering the braking force is repeated.

Therefore, when the left brake lever 22 is operated, the front wheel 10 and the rear wheel 14 can exert a braking force at an appropriate ratio. The action of the anti-lock brake can be appropriately performed independently corresponding to the wheel that has been set.

According to the embodiment, the first brake system 24 and the second brake system 26 are provided with brake hydraulic control units 28 and 30 having an anti-lock brake function for preventing the wheels 10 and 14 from being locked, respectively. Also, since each of the brake hydraulic control units 28 and 30 forms an independent hydraulic circuit with the first brake system 24 and the second brake system 26 and includes the hydraulic pump units 32 and 34 for increasing the respective brake hydraulic pressures. The anti-lock operation can be independently performed in both the first brake system 24 and the second brake system 26, and the brake hydraulic pressure can be optimally controlled.

The front disc brake 12 and the rear drum brake 16 of the first brake system 24 include:
Solenoid vibes 74, 78 and 62, 68 are provided to control the supply and discharge of hydraulic pressure, respectively, so when performing front and rear wheel interlocking braking, the brake pressure on the other side decreases when either the front wheel or the rear wheel is locked. Does not occur, and the braking distance does not increase. Further, the interlocking braking and the antilock braking function can be achieved by a 4-piston type disc brake instead of a 6-piston disc brake, and the structure is simplified.

[0035]

As described above, according to the first aspect of the present invention, the antilock operation can be independently performed in both the first brake system and the second brake system, and the brake hydraulic pressure is optimally controlled. can do. Further, when the front and rear wheel interlocking brake is performed, when either the front wheel or the rear wheel is locked, the brake pressure on the other side does not decrease, and the braking distance does not increase.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a front and rear wheel interlocking brake device mounted on a scooter type motorcycle according to an embodiment.

FIG. 2 is an explanatory view of an arrangement of a brake lever of a steering wheel.

FIG. 3 is an explanatory diagram of a hydraulic circuit of the front and rear wheel interlocking brake device of FIG. 1;

FIG. 4 is a detailed view of the disk brake in a longitudinal sectional view.

FIG. 5 is an explanatory view of a conventional front and rear wheel interlocking brake device.

FIG. 6 is another explanatory diagram.

[Explanation of symbols]

 Reference Signs List 10 front wheel 12 front disc brake 14 rear wheel 16 rear drum brake 24 first brake system 26 second brake system 28 brake hydraulic control unit (first brake system) 30 brake hydraulic control unit (second brake system) 32 hydraulic pump unit (second 1 brake system) 34 Hydraulic pump unit (second brake system)

Claims (1)

[Claims] 1. A motorcycle comprising: a first brake system for simultaneously braking a front wheel and a rear wheel; and a second brake system for braking only a front wheel, wherein the first brake system and the second brake system each include a wheel. An anti-lock brake device for preventing locking is interposed. The anti-lock brake device includes a hydraulic pump unit that forms an independent hydraulic circuit for the first brake system and the second brake system and increases each brake hydraulic pressure. A front-rear wheel interlocking brake device for a motorcycle, wherein a control valve for controlling supply and discharge of hydraulic pressure is provided on each of a front wheel brake and a rear wheel brake of a first brake system.