JPH09309482A - Brake device for motorcycles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a simultaneous operation of a front wheel brake and a rear wheel brake in the operating time of a second master cylinder, while securing the independent operation of the front wheel brake by W first master cylinder. SOLUTION: A piston of the first master cylinder M1 which can operate a front wheel brake is made in a piston with step 25 which consists of a large diameter piston 25a and a small diameter piston 25b continued integrally to the rear end of the large diameter piston 25a, and the output port of the second master cylinder which can operate a rear wheel brake is communicated to an input oil pressure chamber 37 to which the rear end surface of the large diameter piston 25a is faced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a motorcycle, and more particularly, to a first master cylinder operated by a first brake operator for operating a front wheel brake and a second brake for operating a rear wheel brake. The present invention relates to an improvement including a second master cylinder operated by an operator.

[0002]

2. Description of the Related Art In such a conventional brake device, front and rear wheel brakes are individually actuated by first and second master cylinders.

In braking conventional motorcycles, when the second master cylinder is operated to actuate the rear wheel brake, the first master cylinder is simultaneously actuated to actuate the front wheel brake. In order to spin turn to reverse the direction of the vehicle while spinning the rear wheels and to advance braking to increase the front wheel load and perform effective braking, only the first master cylinder is operated and the front wheel brake is operated independently. It is often operated.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a brake operation peculiar to such a motorcycle, and ensures the independent operation of the front wheel brake by the first master cylinder, and the second master cylinder. It is an object of the present invention to provide the above-mentioned motorcycle brake device capable of interlocking operation of the front and rear wheel brakes only when the above operation is performed to simplify the brake operation.

[0005]

To achieve the above object, the present invention provides a first master cylinder operated by a first brake operator for actuating a front wheel brake, and a first master cylinder for actuating a rear wheel brake. In a motorcycle braking device including a second master cylinder operated by two brake operators, the first master cylinder includes a cylinder body, a large-diameter piston portion, and a small-diameter piston portion integrally connected to a rear end of the cylinder body. And a stepped piston that is fitted in the cylinder body, and an output hydraulic chamber and an input hydraulic chamber that are defined in the cylinder body and that face the front end face and the rear end face of the large-diameter piston part, respectively. The output port connected to the chamber is connected to the front wheel brake operated by the output hydraulic pressure, while the output port of the second master cylinder is connected to the input hydraulic chamber. The first, characterized in that the.

Further, in addition to the above characteristics, the present invention separates the first brake operator, which pushes the stepped piston of the first master cylinder to generate hydraulic pressure in its output hydraulic chamber, from the stepped piston. The second feature is that the spring is biased to.

[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, in FIG. 1 showing a first embodiment of the present invention, a steering wheel 1 of a motorcycle has a first master cylinder M ₁ adjacent to the right grip portion thereof and adjacent to a left grip portion thereof. And a second master cylinder M ₂ is attached.
These master cylinders M ₁ and M ₂ are provided with first and second brake levers L ₁ and L for individually operating them.
₂ (first and second brake operators).

[0009] Output port 2 of the _first master cylinder M ₁
Is the hydraulic front wheel brake Bf via the first hydraulic conduit 3 _1.
Connected to the input port 4 of. The output port 2 of the _second master cylinder M ₂ is connected to the input port 6 of the hydraulic actuator 5 via the second hydraulic conduit 3 _2, the second hydraulic conduit 3 _2, the second master cylinder M ₂ A proportional pressure reducing valve 7 for transmitting the output hydraulic pressure to the hydraulic actuator 5 with a predetermined pressure reducing ratio is provided.

The hydraulic actuator 5 is a cylinder 8 fixed to the vehicle body, and an operating piston 1 which is fitted into the cylinder 8 to divide the inside into a hydraulic chamber 9 and a spring chamber 10.
1 and a return spring 13 for urging the working piston 11 toward the hydraulic chamber 9, and the downstream end of the second hydraulic conduit 3 ₂ is connected to the input port 6 connected to the hydraulic chamber 9.

The actuating piston 11 is integrally provided with an actuating rod 11a penetrating one end wall of the cylinder 8, and the actuating lever 11a has a brake wire 15 made of Bowden wire as an actuating lever 14 of the mechanical rear wheel brake Br. Connected through.

The first master cylinder M ₁ has an input port 16
The output port 2 _{2 of} the second master cylinder M ₂ is also connected to the input port 16 thereof via the third hydraulic conduit 3 ₃ .

The structure of the first master cylinder M ₁ will be described in detail with reference to FIG. The first master cylinder M ₁ has a cylinder body 20 fixed to the steering handle 1. The cylinder body 20 has a large-diameter cylinder hole 21 that opens at the front end of the body 20 and a small-diameter cylinder hole 22 that opens in a recess 23 formed at the rear end of the body 20.
4, the stepped piston 25 is slidably fitted over both of the cylinder holes 21 and 22. This stepped piston 25 has a large diameter cylinder hole 2
1 has a large diameter piston portion 25a, and a small diameter cylinder hole 22 has a small diameter piston portion 25b.
It is configured to be integrally connected via c. The rear end of the small-diameter piston portion 25b is projected toward the recess 23, and the pressing portion of the first brake lever L ₁ contacts the end surface thereof. The first brake lever L ₁ is provided with a torsion spring 2 so as to separate it from the rear end of the small diameter piston portion 25b.
A spring force of 6 is applied.

The large-diameter piston portion 25a has its front end closely contacting the inner peripheral surface of the large-diameter cylinder hole 21.
7, the cup seal member 27 and the screw plug 28 screwed into the front end opening of the large diameter cylinder hole 21 define an output hydraulic chamber 29 in the large diameter cylinder hole 21.
The output port 2 ₁ is connected to the output hydraulic chamber 29.

In the output hydraulic chamber 29, a return spring 30 for urging the stepped piston 25 in the backward direction (rightward in the figure) is provided in a contracted manner. Is defined by abutting on the annular step portion 24.

Seal rings 34 and 35, which are in close contact with the inner peripheral surfaces of the large-diameter cylinder hole 21 and the small-diameter cylinder hole 22, are attached to the middle portion of the large-diameter piston portion 25a and the front end portion of the small-diameter piston portion 25b, respectively. The cup seal member 27 and the seal ring 34 define a replenishment oil chamber 36 in the large diameter cylinder hole 21.
35 from the large diameter cylinder hole 21 to the small diameter cylinder hole 22
The input hydraulic chamber 37 is defined. Input port 1
6 is connected to this input hydraulic chamber 37.

A reserve tank 31 for storing hydraulic oil is continuously provided on the upper side of the cylinder body 20, and a relief port 32 and a supply port 33 for communicating a bottom portion of the reserve tank 31 with the large diameter cylinder hole 21. Are drilled in the cylinder body 20. At that time, relief port 3
2 is arranged so as to open to the output hydraulic chamber 29 immediately before the cup seal member 27 when the stepped piston 25 is located at the backward limit, and the supply port 33 is provided at the supply port 33.
5 is arranged so as to always open to the replenishment oil chamber 36.

When the cup seal member 27 crosses the relief port 32 forward by the forward movement of the stepped piston 25, a hydraulic pressure corresponding to the forward movement amount of the stepped piston 25 can be generated in the output hydraulic chamber 29. it can. Further, when the pressure of the output hydraulic chamber 29 falls below the replenishment oil chamber 36 during the retreat of the stepped piston 25, the outer peripheral lip of the cup seal member 27 bends toward the output hydraulic chamber 29 side, and thus the replenishment oil chamber 36.
Can supply the hydraulic oil to the output hydraulic chamber 29.

In FIG. 2, reference numeral 38 is a small diameter piston 25.
It is a dustproof boot that covers the outer peripheral surface exposed to the recess 23 of b.

Next, the operation of this embodiment will be described.

First, when the stepped piston 25 of the first master cylinder M ₁ is moved forward by operating only the first brake lever L ₁ , a hydraulic pressure is generated in the output hydraulic chamber 29 as described above, and the hydraulic pressure is output. It is supplied from the port 2 ₁ to the front wheel brake Bf via the first hydraulic conduit 3 ₁ and can be operated independently. Since this time the input hydraulic pressure chamber 37 the volume with the advancement of the stepped piston 25 is expanded inhales the third hydraulic conduit 3 ₃ through the second master cylinder M ₂ hydraulic oil, the input hydraulic pressure chamber 37 is stepped It does not hinder the forward movement of the piston 25.

When the second master cylinder M ₂ is operated by operating only the second brake lever L ₂ , the hydraulic pressure generated from the output port 2 ₂ to the second and third hydraulic conduits 3 ₂ ,
It is simultaneously output to 3 ₃ . The hydraulic pressure output to the second hydraulic conduit 3 ₂ is supplied to the hydraulic chamber 9 of the hydraulic actuator 5 via the proportional pressure reducing valve 7 and moves the operating piston 11 against the return spring 13 to the left in the figure. The brake wire 15 is pulled through the rod 11a to rotate the operating lever 14, thereby operating the rear wheel brake Br.

On the other hand, the hydraulic pressure output to the third hydraulic pressure conduit 3 ₃ is supplied to the input hydraulic pressure chamber 37 of the first master cylinder M ₁ , whereby the rear surface of the large diameter piston 25a is pressed and the stepped piston 25 is advanced. Since the hydraulic pressure is generated in the output hydraulic chamber 29, the front wheel brake Bf can be operated at the same time.

At this time, since the first brake lever L ₁ is held in the predetermined retracted position by the spring 26, even if the stepped piston 25 is far away from the pressing portion of the first brake lever L ₁ , the first brake lever L ₁ is released. The blind movement of the lever L ₁ can be suppressed.

First and second brake levers L₁, L_TwoTo
First and second master cylinder M ₁, M_TwoMade at the same time
When moved, the front and rear wheel brakes Bf and Br are activated simultaneously.
Of course, the first master cylinder
M₁The stepped piston 25 of the first brake lever L₁
Pressing force by the second master cylinder M_TwoOutput hydraulic pressure
First master cylinder M₁Input hydraulic chamber 37
The pressing force exerted on the connection portion 25a is added to act, and stepped
Because the piston 25 is strongly pressed forward, the front wheel break
It is possible to increase the braking force of Bf.

FIG. 3 shows a second embodiment of the present invention.
Constitute a rear wheel brake Br hydraulically, has the same configuration as that of the previous embodiment except that is connected to the input port 40 of the second hydraulic conduit 3 ₂ of the downstream end directly, in the figure, the previous example The same reference numerals are given to the portions corresponding to.

According to this embodiment, it is not necessary to use the hydraulic actuator 5 as in the previous embodiment, and the structure can be simplified.

Next, a third embodiment of the present invention will be described with reference to FIG.
I do. First and second brake lever L₁, L_TwoIs steering
Left and right lever holders 41 fixed to the handle 1₁, 4
1_TwoThese brake levers L are pivotally supported by₁, L_TwoBy
Ri first and second operation wire 42₁, 42_TwoThrough it
First and second master cylinders M operated individually₁, M _Two
However, the cylinder body 45, which is fixed in place on the vehicle body, is
And then unitized.

The first master cylinder M ₁ arrangement, since the previous Example the first master cylinder M ₁ and basically the same, the parts corresponding to those in FIG central front embodiment are denoted by the same reference numerals and it The detailed description thereof will be omitted.

The second master cylinder M ₂ is, similarly to the conventional one, a piston 47 slidably fitted in a cylinder hole 46, a cup seal member 48, a hydraulic chamber 49, a replenishing oil chamber 50, and a relief port 51. , A supply port 52 and an output port 2 ₂ .

The relief ports 32 and 51 and the supply ports 33 and 52 of both master cylinders M ₁ and M ₂ communicate with a common reserve tank 53 attached to the upper part of the cylinder body 45.

First and second master cylinders M₁, M_Twoof
Output port 2₁, 2_TwoOn the same side of the cylinder body 45
It is provided so as to open. At that time, the second master silrin
Da M _TwoOutput port 2_TwoIs the first master cylinder M₁Entering
Force hydraulic chamber 37 and second master cylinder M_TwoBetween the hydraulic chambers 49
The chambers 37 and 49 are communicated with each other by penetrating the partition wall.

The cylinder body 45 has a first and a second
First and second relay levers 54 ₁ and 5 that can move the pistons 25 and 47 of the master cylinders M ₁ and M ₂ forward, respectively.
4 ₂ is pivotally supported, and the first and second brake levers L ₁ and L ₂ are interlockingly connected to these relay levers 54 ₁ and 54 ₂ via first and second operation wires 42 ₁ and 42 _2. . The first relay lever 54 ₁ has the stepped piston 2
The spring force of the spring 55 is applied so as to separate it from the rear end of 5.

The other structure is the same as that of the first embodiment. In the figure, the parts corresponding to those of the first embodiment are designated by the same reference numerals.

When the first brake lever L ₁ is actuated, the first relay lever 54 ₁ interlocked with this actuates the stepped piston 25 of the first master cylinder M ₁ to move forward, so that the output port 2 ₁ The front wheel brake Bf can be operated by the output hydraulic pressure from. When the second brake lever L ₂ is actuated, the second relay lever 5 interlocked with this is activated.
4 ₂ actuates the second master cylinder M ₂ , so that the output hydraulic pressure from its output port 2 ₂ actuates the stepped piston 25 of the first master cylinder M ₁ forwardly and at the same time actuates the hydraulic actuator 5, thus , The rear wheel brakes Bf and Br can be operated simultaneously. At this time, the first brake lever L ₁ and the first relay lever 54
₁ is held in the inoperative position by the spring 55 and does not move blind.

Further, the first and second brake levers L ₁ ,
When L ₂ is simultaneously operated, the front and rear wheel brakes Bf and Br are simultaneously operated, and the input of the first relay lever 54 _{1 to} the stepped piston 25 and the same stepped piston of the output hydraulic pressure of the second master cylinder M ₂ are performed. The braking force of the front wheel brake Bf can be increased by the sum of the input to 25.

Moreover, in this second embodiment, the first and the first
2 master cylinder M₁, M_TwoOn the same cylinder body 45
Both master cylinders
M₁, M _TwoSimplifies the configuration of the
Become an act. In addition, the third hydraulic pressure in the first embodiment
Conduit 3₁No such piping is required.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the proportional pressure reducing valve 7 can be removed from the second hydraulic conduit 3 ₂ .

[0039]

As described above, according to the first feature of the present invention, the first master cylinder operated by the first brake operator to operate the front wheel brake and the second master cylinder operated to operate the rear wheel brake. In a motorcycle braking device including a second master cylinder operated by a brake operator, the first master cylinder includes a cylinder body, a large-diameter piston portion, and a small-diameter piston portion integrally connected to a rear end of the cylinder body. The stepped piston that is fitted in the cylinder body, and the output hydraulic chamber and the input hydraulic chamber that are defined in the cylinder body and that face the front end face and the rear end face of the large-diameter piston part, respectively, Output port connected to
Since the output port of the second master cylinder is connected to the input hydraulic chamber while being connected to the front wheel brake that is operated by the output hydraulic pressure, the front wheel brake is independently operated when the first master cylinder is operating, and the second master cylinder of the second master cylinder is operated. At the time of operation, the first master cylinder can be interlocked to operate the front and rear wheel brakes at the same time, and thus various braking states according to the driving state peculiar to the motorcycle can be easily obtained. Moreover, when both master cylinders are operating, the output hydraulic pressure of the second master cylinder is also added to the input of the first master cylinder, so that the braking force of the front wheel brake can be strengthened and effective braking can be performed.

According to the second aspect of the present invention, the first brake operator, which pushes the stepped piston of the first master cylinder to generate hydraulic pressure in its output hydraulic chamber, is separated from the stepped piston. Since the spring is biased as described above, when the stepped piston of the first master cylinder is moved forward by the output hydraulic pressure of the second master cylinder, the first brake operator is left behind, but the spring biasing force of the operator causes the first brake operator to leave. Blinding can be prevented.

[Brief description of drawings]

FIG. 1 is an overall view of a brake device for a motorcycle according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a first master cylinder in the brake device.

FIG. 3 is an overall view of a braking device for a motorcycle according to a second embodiment of the present invention.

FIG. 4 is an overall view of a brake device for a motorcycle according to a third embodiment of the present invention.

[Explanation of symbols]

 20 Cylinder Body 25 Stepped Piston 25a Large Diameter Piston Section 25b Small Diameter Piston Section 26 Spring 29 Output Hydraulic Chamber 37 Input Hydraulic Chamber 45 Cylinder Body 55 Spring

Claims (2)

[Claims] 1. A first wheel for operating a front wheel brake (Bf)
Brake operator (L ₁) The first masters operated by
Linda (M₁), And to activate the rear wheel brake (Br)
Second brake operator (L_Two) The second mass operated by
Ta cylinder (M_Two) And a brake device for motorcycles equipped with
The first master cylinder (M₁) To the cylinder body (20,
45) and a large-diameter piston part (25a) and a rear end
It consists of a small diameter piston (25b) connected to the body
Stepped piston fitted in the Linda body (20, 45)
(25) and is defined in the cylinder body (20, 45)
The large-diameter piston part (25a) has a front end face and a rear end face.
The output hydraulic chamber (29) and the input hydraulic chamber (37) facing each other
And an output port connected to the output hydraulic chamber (29).
To (2₁) Is the front wheel
While connected to the brake (Bf), the input hydraulic chamber (37)
The second master cylinder (M_Two) Output port (2_Two)
Brake device for motorcycles, characterized by communication
Place. 2. The first brake operator according to claim 1, wherein the stepped piston (25) of the first master cylinder (M ₁ ) is pushed to generate a hydraulic pressure in its output hydraulic chamber (29). A brake device for a motorcycle, wherein (L ₁ ) is biased by a spring so as to be separated from the stepped piston (25).