JPH09216547A - Antilock brake device of motorbicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the lengths of flexible pipes as short as possible, so as to reduce the liquid loss, by providing a hydraulic modulator in a front cowl of a car body to cover a front fork to support a steering handle and the front wheel. SOLUTION: In the car body 1 of a scooter as a motorbicycle, a main frame 2 is provided to run longitudinally at the center of the car body, and the middle part of a front fork 3 with dumper journalled allowable to steer to a head pipe 2a at the front end of the main frame 2 is to be covered by a front cowl 1c. While the front wheel Wf is journalled to the lower end of the front fork 3, a hydraulic front wheel brake Bf to brake the front wheel is provided, and a hydraulic modulator 13 is installed to the front surface of the head pipe 2a through a bracket 14, inside the front cowl 1c. Consequently, the lengths of flexible pipes 17 and 18 are reduced as short as possible, and a liquid loss can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a first master cylinder attached to one end of a steering handle and a hydraulic front wheel brake via a flexible conduit, and at the middle of the flexible conduit. The present invention relates to an improvement in an antilock brake device for a motorcycle, which includes a hydraulic modulator for antilock control.

[0002]

2. Description of the Related Art Such an anti-lock brake device for a motorcycle is already known, as disclosed in, for example, Japanese Patent Laid-Open No. 6-329006. In this device, the flexible conduit that interconnects the first master cylinder, the hydraulic modulator, and the front wheel brake allows the steering handle to rotate and the front wheel to move up and down due to the flexure, but when transmitting the braking hydraulic pressure, Some liquid loss is caused by the expansion of the passage. Since this liquid loss contributes to producing an ineffective stroke of the master cylinder, it is desirable to minimize it.

[0003]

By the way, in the conventional anti-lock brake device for a motorcycle, the hydraulic modulator is arranged in the central portion of the vehicle body in the front-rear direction so as to avoid damage caused by contact with other objects as much as possible. However, if so arranged, the hydraulic modulator will be far away from the first master cylinder and the front wheel brake, and the flexible conduit connecting them will be inevitably long, so that liquid loss during transmission of the braking hydraulic pressure will be lost. Has the drawback of increasing.

The present invention has been made in view of such circumstances, and protects a hydraulic modulator from contact with other objects without using a special protective cover, and uses a flexible conduit as short as possible. It is an object of the present invention to provide an anti-lock brake device for a motorcycle that can reduce the liquid loss.

[0005]

In order to achieve the above object, the present invention provides a hydraulic modulator in a front cowl portion of a vehicle body that covers a front fork supporting a steering handle and front wheels. Characterize.

In addition to the above features, the present invention connects the second master cylinder attached to the other end of the steering handle and the hydraulic modulator via another flexible conduit, and also connects the hydraulic modulator and the vehicle body. A hydraulic actuator arranged in the intermediate portion is connected via a rigid conduit so that the output hydraulic pressure of the second master cylinder is supplied to the hydraulic actuator via the hydraulic modulator, and the operating member of this hydraulic actuator and the mechanical type The second feature is that the rear wheel brakes are connected via Bowden wires.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

First, referring to FIG. 1 showing a first embodiment of the present invention, a vehicle body 1 of a scooter as a motorcycle is constructed by sequentially connecting a front cowl portion 1c, a step portion 1t and a seat portion 1s from the front. The main frame 2 is arranged so as to run longitudinally in the center thereof, and the front cowl portion 1c covers an intermediate portion of a front fork 3 with a damper operably supported by a head pipe 2a at the front end of the main frame 2. .

A front wheel Wf is pivotally supported at the lower end of the front fork 3 and a hydraulic front wheel brake Bf for braking the front wheel Wf is provided. This front wheel brake Bf is a hydraulic type and has a brake disc 4 that rotates integrally with the front wheel Wf.
And a brake caliper 5 supported by the front fork 3 straddling the same, and the brake caliper 5 presses the brake disc 4 to brake when hydraulic pressure is supplied.

A power unit 6 located below the seat 1s is pivotally supported on the main frame 2 via a pivot shaft 7 so as to be vertically swingable, and a damper unit 8 is interposed between the power unit 6 and the main frame 2. To be done.

A rear wheel Wr driven by the power unit 6 is supported at the rear end of the power unit 6, and the rear wheel Wr is also supported.
A mechanical rear wheel brake Br for braking r is provided.
When the operating lever 9 is rotated, this rear wheel brake Br is
A brake shoe (not shown) is expanded to brake the brake drum that rotates integrally with the rear wheel Wr.

As shown in FIGS. 1 and 2, the steering wheel 10 connected to the upper end of the front fork 3 has a first master cylinder M ₁ adjacent to the right grip portion thereof and adjacent to the left grip portion thereof. Then, the second master cylinder M ₂ is attached. These master cylinders M ₁ and M ₂ have first and second brake levers 12 ₁ and 12 for operation, respectively.
_{It has two} .

Further, the main frame is installed in the front cowl portion 1c.
At the front end of the frame 2, that is, the front surface of the head pipe 2a, a hydraulic
The dulator 13 is attached via the bracket 14.
You. This hydraulic modulator 13 has a first and
Second introduction port 15₁, 15_TwoOn the bottom of the
And the second derivation port 16₁, 16_TwoOpen the first
1st and 2nd introduction port 15₁, 15_TwoThe first and second
Master cylinder M₁, M _TwoEach output port is made of rubber
Part flexible conduit 17₁, 17_TwoRespectively connected via
Also, the first derivation port 16₁Input of front wheel brake Bf
A lower flexible conduit 18 made of rubber is connected to the port.

On the other hand, in the second outlet port 16 ₂ , the input port 20 of the hydraulic actuator 19 attached to the main frame 2 in the step portion 1t is connected to the rigid conduit 2 made of metal.
1 is connected.

As shown in FIG. 2, the modulator 13 is
A first main oil passage 22 ₁ connecting the first introduction and outlet ports 15 _1, 16 ₁ between second introduction and outlet port 15 _2, 16 ₂
The second main oil passage 22 ₂ connecting between the first and second main oil passages 22
_1, 22 and the normally open first and second inlet valve 23 consists of a solenoid valve _1, 23 ₂ interposed respectively _2, first and second main oil passage in these series 22 _1, 22 _2, respectively The orifices 24 ₁ and 24 ₂ provided and the respective inlet valves 23 ₁ and 23
₂ and the orifices 24 ₁ and 24 ₂ , bypassing the first and second main oil passages 22 ₁ and 22 ₂ , respectively, and first and second bypasses 25 ₁ and 25 ₂ , and these bypasses 2
Check valves 39 ₁ and 5 ₁ , 25 ₂ ,
39 ₂ , each inlet valve 23 ₁ , 23 ₂ and orifice 24
₁ and 24 ₂ bypassing the first and second main oil passages 22 ₁ and 22
First and second return oil passage 26 ₁ connected to the _2, respectively,
26 ₂ and the first and second outlet valves 27, which are normally closed solenoid valves installed in the return oil passages 26 ₁ and 26 ₂ , respectively.
₁ , 27 ₂ and first and second hydraulic pumps 28 ₁ , 28 ₂ which are respectively installed in the first and second return oil passages 26 ₁ , 26 ₂ on the downstream side of the outlet valves 27 ₁ , 27 _2. , First and second hydraulic reservoirs 29 ₁ , 29 ₂ respectively connected to the first and second return oil passages 26 ₁ , 26 ₂ between the outlet valves 27 ₁ , 27 ₂ and the hydraulic pumps 28 ₁ , 28 _2. , A common electric motor 30 capable of driving the first and second hydraulic pumps 28 ₁ and 28 ₂ , and each hydraulic pump 28 ₁ , 2
8 ₂ has suction valves 31 ₁ , 31 _{2 at} its inlet and discharge valves 32 ₁ , 32 ₂ at its outlet.

As shown in FIG. 3, the hydraulic actuator 19 is fitted in a cylinder 33 fixed to the main frame 2 by a bolt in the step portion 1t and a cylinder hole 33a of the cylinder 33, and the inside of the hydraulic actuator 19 is hydraulically operated. Working piston 36 (working member) partitioned into chamber 34 and spring chamber 35
And a return spring 37 for urging the working piston 36 toward the hydraulic chamber 34, and the downstream end of the rigid conduit 21 is connected to the input port 20 communicating with the hydraulic chamber 34.

The operating piston 36 is integrally formed with a piston rod 36a penetrating one end wall of the cylinder 33. The piston rod 36a is connected to the operating lever 9 of the rear wheel brake Br via a Bowden wire 38. To be done.

Next, the operation of this embodiment will be described.

During normal braking in which the front and rear wheels Wf and Wr are unlikely to be locked, the inlet valves 23 ₁ and 23 ₂
Is in the demagnetized state and is open, and the outlet valves 27 ₁ and 27 ₂ are in the demagnetized state but are closed. Therefore, the braking hydraulic pressure output from the first master cylinder M ₁ operated by the brake lever 12 ₁ is transmitted from the upper flexible conduit 17 ₁ to the first main oil passage 22 ₁ of the hydraulic modulator 13 and the orifice 24.
_{1 through} the first inlet valve 23 ₁ and further through the lower flexible conduit 18 to be supplied to the front wheel brake Bf to operate it.
The _second brake lever 12 ₂ actuated the second
The braking oil pressure output from the master cylinder M _{2 is} transmitted from the upper flexible conduit 17 ₂ to the second main oil passage 2 of the oil pressure modulator 13.
It is supplied to the hydraulic chamber 34 of the hydraulic actuator 19 through 2 ₂ , the orifice 24 ₂ , the second inlet valve 23 ₂ and the rigid conduit 21. Then, the working piston 36 moves to the spring chamber 35 side with the hydraulic pressure, and the Bowden wire 38
Is pulled to rotate the operating lever 9 to operate the rear wheel brake Br.

When the front wheels Wf or the rear wheels Wr are likely to lock during such braking, the first or second inlet valve 23 ₁ or 23 ₂ is instructed by a command from a control unit (not shown).
Is excited to close the valve, and the first or second outlet valve 27
₁ or 27 ₂ is excited to open the valve. As a result, the braking hydraulic pressure of the front wheel brake Bf or the hydraulic actuator 19 is
Part of the first or second hydraulic reservoir 29 ₁ or 29 ₂
Is absorbed, the pressure is reduced, the braking force of the front wheel brake Bf or the rear wheel brake Br is weakened, and the lock phenomenon of the front wheel Wf or the rear wheel Wr is avoided. Then the inlet valve 2
3 ₁ or 23 ₂ and the outlet valve 27 ₁ or 27 ₂ return to the original demagnetized state. During this time, the electric motor 30 operates according to a command from a control unit (not shown) to operate the first and second electric motors.
Since the hydraulic pumps 28 ₁ and 28 ₂ are driven, the hydraulic pressure absorbed by the hydraulic reservoirs 29 ₁ and 29 ₂ is returned to the corresponding master cylinders M ₁ and M ₂ .

When the operation of the first or second master cylinder M ₁ , M ₂ is released, the braking hydraulic pressure of the front wheel brake Bf becomes the first hydraulic pressure.
Because through the bypass 25 ₁ and the check valve 39 ₁ is released in the first master cylinder M _1, the front wheel brake Bf is returned to the inoperative state immediately. Further, the braking hydraulic pressure of the hydraulic actuator 19 is the second bypass 25 ₂ and the check valve 3
It is released to the second master cylinder M ₂ through 9 _2. Therefore, the working piston 36 of the hydraulic actuator 19
Moves backward by the elastic force of the return spring 37 and loosens the Bowden wire 38, so that the rear wheel brake Br also quickly becomes inoperative.

By the way, the first and second master cylinders M ₁ and M ₂ attached to the steering handle 10 have upper flexible conduits 17 ₁ and 17 attached to the hydraulic modulator 13 attached to the head pipe 2a of the main frame 2. because it is connected via a _2, rotation of the steering wheel 10 due to deflection of the top flexible conduit 17 _1, 17 ₂ is allowed, also the hydraulic modulator 13 and the front wheel brake Bf between even lower flexible conduit 1
Since the lower flexible conduit 18 is bent, the front wheel W is accompanied by the cushioning action of the front fork 3.
Vertical movement of f is allowed.

[0023] Moreover, the hydraulic modulator 13, because they occupy a position relatively close a front end of the main frame 2 in any of the first master cylinder M ₁ and the front wheel brake Bf, the first master cylinder M ₁ and the front wheel brake Bf The flexible conduits 17 ₁ and 18 between them need only be relatively short, and therefore, when the front wheels are braked, these flexible conduits 1 1,
7 _1, 18 can be suppressed hydraulic loss due to pipe expansion.

Further, since the hydraulic modulator 13 is covered by the front cowl portion 1c, the hydraulic modulator 13 can be protected from contact with flying stones and other objects without providing a dedicated protective cover.

On the other hand, the working piston 36 of the hydraulic actuator 19 attached to the intermediate portion of the main frame 2 is
Since it is connected to the rear wheel brake Br via the Bowden wire 38, the bowing of the Bowden wire 38 causes the buffer unit 8 to buffer the power unit 6 and the rear wheel W.
Vertical swing of r is allowed.

In addition, between the second master cylinder M ₂ and the rear wheel brake Br, the hydraulic modulator 13 and the hydraulic actuator 19 which do not move relative to each other are connected via the rigid conduit 21 although the distance is very long. In addition, since the hydraulic actuator 19 and the rear wheel brake Br that cause relative movement are connected via the Bowden wire 38, the flexible conduit 17 ₂ is connected to the second master cylinder M _{2 having} a short distance and the hydraulic modulator 13. The flexible conduit 1 is used even when the rear wheels are braked.
The liquid loss due to the expansion of the conduit of 7 ₂ can be made extremely small.

FIG. 4 shows a second embodiment of the present invention.
The structure is the same as that of the first embodiment except that the hydraulic modulator 13 is attached to the rear surface of the head pipe 2a via the bracket 14. In the drawings, the same reference numerals are given to the portions corresponding to the first embodiment. Attach.

The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, in the first feature of the present invention, a non-antilock brake device can be applied to the rear wheel brake Br. Further, the present invention can be applied to a motorcycle having a front cowl portion.

[0029]

As described above, according to the first aspect of the present invention, since the hydraulic modulator is disposed in the front cowl portion of the vehicle body that covers the steering handle and the front fork supporting the front wheels, the front cowl portion is provided on the vehicle body. In a motorcycle such as a scooter, the front cowl portion of the motorcycle protects the hydraulic modulator from contact with other objects, and the dedicated protection is unnecessary. Moreover, since the hydraulic modulator in the front cowl occupies a position relatively close to both the first master cylinder and the front wheel brake, a flexible conduit connecting them is sufficient, and a liquid loss at the time of front wheel braking is sufficient. It can be kept small.

According to the second aspect of the present invention, the second master cylinder attached to the other end of the steering handle is connected to the hydraulic modulator via another flexible conduit, and the hydraulic modulator is connected to the second master cylinder. A hydraulic actuator arranged in the middle of the vehicle body is connected via a rigid conduit to supply the output hydraulic pressure of the second master cylinder to the hydraulic actuator via a hydraulic modulator. Since the rear wheel brake of this type is connected via the Bowden wire, the flexible conduit has a relatively long distance between the second master cylinder and the rear wheel brake.
The second master cylinder and the hydraulic modulator are simply provided in the connection in a relatively short section, and therefore the liquid loss during rear wheel braking can be further suppressed.

[Brief description of drawings]

FIG. 1 is a side view of a scooter having an antilock brake device according to a first embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of the antilock brake device.

FIG. 3 is a vertical sectional side view of the hydraulic actuator section in FIGS. 1 and 2.

FIG. 4 is a side view of a scooter showing a second embodiment of the present invention.

[Explanation of symbols]

Bf Front wheel brake Br Rear wheel brake M ₁ First master cylinder M ₂ Second master cylinder Wf Front wheel Wr Rear wheel 1 Body 1c Front cowl part 3 Front fork 10 Steering handle 13 Hydraulic modulator 17 ₁ and 18 Flexible conduit 17 ₂ Flexible conduit 21 Rigid conduit 36 Working piston as working member 38 Bowden wire

Claims (2)

[Claims] 1. A first master cylinder (M ₁ ) attached to one end of a steering handle (10) and a hydraulic front wheel brake (Bf) are connected via flexible conduits (17 ₁ , 18). while, the flexible conduit (17 _1, 18) of the interposed hydraulic modulator (13) for antilock control on the way, the anti-lock brake system of a motorcycle, the steering wheel (10) and the front wheel (Wf An antilock brake device for a motorcycle, characterized in that a hydraulic modulator (13) is arranged in a front cowl portion (1c) of a vehicle body (1) that covers a front fork (3) supporting (1). 2. The flexible conduit (17) according to claim 1, wherein the second master cylinder (M ₂ ) attached to the other end of the steering handle (10) and the hydraulic modulator (13) are separate from each other. ₂ ) and the hydraulic modulator (13) and the hydraulic actuator (19) arranged in the middle of the vehicle body (1) via the rigid conduit (21) to connect the second master cylinder ( The output hydraulic pressure of M ₂ ) is supplied to the hydraulic actuator (19) via the hydraulic modulator (13), and the operating member (36) of this hydraulic actuator (19) and the mechanical rear wheel brake (Br) are connected. An anti-lock brake device for a motorcycle, characterized in that it is connected through a Bowden wire (38).