JPH06179356A - Braking hydraulic pressure control device - Google Patents

Abstract

PURPOSE:To convert the pressure reducing inclination and the pressure intensifying inclination easily in a simple structure by connecting the output hydraulic pressure chamber of a braking hudraulic pressure control device having an input hydraulic pressure chamber connected to a master cylinder, to a wheel brake through a solenoid switch valve. CONSTITUTION:The master cylinder M of a motorcycle is connected to a wheel brake B through a modulator land a constantly closed piece solenoid valve 2 as a solenoid switch valve, and the pressure reduction, the pressure maintaining, and the pressure intensification of the brake hydraulic pressure to the wheel brake B is controlled when the wheel is liable to be locked in the controlling condition. The modulator 1 has a cut valve 5 which is closed when a control piston 6 facing its one end to the output hydraulic pressure chamber 4 is moved to the volume increasing side of the output hydraulic pressure chamber 4, and a regulation member 7 which gives a force against springs 81 and 82 to the control piston 6 through an electric motor 9 is connected to the modulator 1. And the pressure reducing inclination and the pressure intensifying inclination are to be regulated by controlling the solenoid valve 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input hydraulic pressure chamber connected to a master cylinder, an output hydraulic pressure chamber connected to a wheel brake, and a control piston having one end facing the output hydraulic pressure chamber.
A cut valve that is provided between the input hydraulic pressure chamber and the output hydraulic pressure chamber and that closes according to the movement of the control piston to the side that increases the volume of the output hydraulic pressure chamber and the side opposite to the output hydraulic pressure chamber Braking hydraulic pressure provided with a regulating member connected to the piston, a spring that exerts a spring force in a direction to press the regulating member against the control piston, and an electric motor that gives the regulating member a force that opposes the spring force of the spring. Regarding the control device.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example, Japanese Patent Laid-Open No.
It is already known from the publication 2-214042.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
When performing antilock control during braking, the cut valve is closed and the volume of the output hydraulic chamber is increased according to the operation of the control piston that accompanies the axial movement of the regulating member by the electric motor. The braking pressure of the brake is reduced, and when the braking pressure is re-increased, the control piston is moved in the direction of reducing the volume of the output hydraulic chamber by the spring biasing force accompanying the operation stop of the electric motor. However, since the pressure reduction gradient is almost constant and the pressure increase gradient is also substantially constant, it is desirable to be able to freely change the pressure reduction gradient and the pressure increase gradient in order to execute more precise antilock control.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a braking fluid pressure control device capable of changing the pressure reduction and pressure increase gradients with a simple structure.

[0005]

In order to achieve the above object, according to the invention of claim 1, the output hydraulic chamber is connected to a wheel brake via an electromagnetic opening / closing valve.

In addition to the configuration of the invention described in claim 1, the apparatus according to the invention described in claim 2 detects that the movement amount of the regulating member according to the operation of the electric motor has reached a predetermined amount. , A detector for stopping the operation of the electric motor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a vertical sectional side view in a state where a cut valve is opened,
FIG. 2 is a vertical cross-sectional side view with the cut valve closed, and FIG. 3 is an operation timing chart.

First, in FIG. 1, for example, a master cylinder M of a motorcycle is connected to a wheel brake B via a modulator 1 and a normally open solenoid valve 2 serving as an electromagnetic opening / closing valve. The output hydraulic pressure of M acts on the wheel brake B as it is, but during antilock control when the wheel is about to be locked during braking, the operation of the modulator 1 and the opening / closing operation of the normally open solenoid valve 2 cause The pressure reduction, the pressure retention and the pressure increase of the brake fluid pressure to the brake B are controlled.

The modulator 1 includes an input hydraulic chamber 3 connected to the master cylinder M, an output hydraulic chamber 4 connected to the wheel brake B via the normally open solenoid valve 2, and an input hydraulic chamber 3 And a cut valve 5 capable of switching between communication and cutoff between the output hydraulic chamber 4, a control piston 6 arranged with one end facing the output hydraulic chamber 4, and a control valve 6 on the opposite side of the output hydraulic chamber 4. A regulating member 7 connected to the control piston 6, a pair of springs 8 ₁ and 8 ₂ that exert a spring force in a direction to press the regulating member 7 against the control piston 6, and a spring of these springs 8 ₁ and 8 ₂ . A DC motor 9 as an electric motor that gives a force that opposes the force to the regulation member 7 is provided.

The modulator 1 is provided with a modulator body 10, and a small diameter hole 11 and a large diameter hole 12 are coaxially provided in the modulator body 10 via a step portion 13. In addition, a plug member 15 having an input port 14 communicating with the master cylinder M is coupled to the modulator body 10 so as to close the opening end of the small diameter hole 11, and between the plug member 15 and the modulator body 10. A partition member 16 is fixedly sandwiched between them. Thus, the plug member 15
Further, the input hydraulic chamber 3 communicating with the input port 14 is formed between the partition member 16. On the other hand, a control piston 6 is slidably fitted in the small diameter hole 11, and an output hydraulic pressure chamber 4 is formed between the control piston 6 and the partition member 16. That is, the control piston 6 is slidably fitted in the small-diameter hole 11 of the modulator body 10 with one end thereof facing the output hydraulic chamber 4.

The partition wall member 16 is formed in a cylindrical shape having a tapered valve seat 18 having a valve hole 17 communicating with the output hydraulic pressure chamber 4 in the central portion at one end side inner surface thereof, and is a cut valve. 5 is a valve spring 2 in which a valve body 19 that can be seated on the valve seat 18 and is housed in the partition wall member 16 is compressed between a retainer 20 fixed to the other end of the partition wall member 16 and the valve body 19.
1 is biased in the valve closing direction.

The partition wall member 16 is provided with a flange portion 16a which projects outward in the radial direction. With the one end side of the partition wall member 16 fitted in the small diameter hole 11, the flange portion 16a is inserted into the modulator body 10. And is sandwiched between the plug members 15.

The valve body 19 is integrally provided with a shaft portion 19a which is loosely fitted in the valve hole 17, and the shaft length of the shaft portion 19a is the shaft when the valve body 19 is seated on the valve seat 18. The tip of the portion 19a is set so as to project into the output hydraulic chamber 4. Thus, the control piston 6 slidably fitted in the small diameter hole 11 can come into contact with the tip of the shaft portion 19a, and as shown in FIG. In the state where the valve body 19 moves toward the side where the volume of
2 is pushed to a position away from each other and the input hydraulic chamber 3 and the output hydraulic chamber 4 communicate with each other through the valve hole 17, while FIG.
As shown by, when the control piston 6 moves to the side that increases the volume of the output hydraulic pressure chamber 4 and the pressing force from the control piston 6 to the valve body 19 is released, the valve body 19 causes the valve spring 21 to move. The valve seat 18 is seated by the spring force and the input hydraulic chamber 3 and the output hydraulic chamber 4 are shut off from each other.

The DC motor 9 is coupled to the modulator body 10 so as to close the open end of the large diameter hole 12, and the DC motor 9 is connected to the regulating member 7 via the ball screw 23. It Therefore, the ball screw 23
The screw shaft 24 is connected to the DC motor 9, and the screw outer 26 is screwed to the screw shaft 24 through a large number of circulating balls 25. The regulating member 7 is connected to the screw outer 26. It Moreover, a regulation groove 27 extending in the axial direction is provided on the inner surface of the large-diameter hole 12 in the modulator body 10, and the regulation projection 26 a protruding from the screw outer 26 is provided in the regulation groove 27.
Is engaged with. Therefore, the screw outer 26, that is, the restricting member 7 is allowed to move in the axial direction but is prevented from rotating about the axis, and accordingly, the screw outer 26, that is, the restricting member 7 moves in the direction approaching the DC motor 9 in accordance with the rotational operation of the DC motor 9. Become.

On the other hand, both springs 8 ₁ and 8 ₂ are connected to the DC motor 9
Also, the screw outer 26 and the screw outer 26 are arranged in parallel so as to be compressed, and exert a spring force in a direction of pressing the screw outer 26, that is, the regulating member 7 against the control piston 6. Therefore, when the rotating operation of the DC motor 9 is stopped, the screw outer 26, that is, the regulating member 7 is caused by the spring force of both springs 8 ₁ and 8 ₂ to move to the output hydraulic chamber 4 as shown in FIG.
The control piston 6 is pushed toward the side where the volume of the cut valve 5 is reduced, whereby the cut valve 5 is opened. On the other hand, when the DC motor 9 is rotationally operated, the screw outer 26, that is, the regulating member 7 increases the volume of the output hydraulic chamber 4 against the spring force of the springs 8 ₁ and 8 ₂ as shown in FIG. The control piston 6 moves backward so as to allow it to move, and the cut valve 5 closes.

By the way, in the modulator body 10, the regulating member 7 has moved by a predetermined amount in response to the operation of the electric motor 9, that is, the control piston 6 receives the hydraulic pressure of the output hydraulic chamber 4 and is regulated by the regulating member 7. A micro switch 28 as a detector for detecting that the volume of the output hydraulic chamber 4 has been increased to a predetermined amount by moving to the position indicated by the arrow is attached. This micro switch 28 is a modulator main body 1
It has a detector 28a that can enter the modulator body 10 from the stepped portion 13 of 0 and can abut against the end surface of the screw outer 26. Until the control piston 6 moves from a position where the volume of the output hydraulic chamber 4 is minimized to a position where the volume of the output hydraulic chamber 4 is increased to a predetermined amount after the cut valve 5 is opened, the detector 28a is moved. Expands and contracts following the movement of the screw outer 26, but when the screw outer 26, that is, the regulating member 7 moves to the side that further increases the volume of the output hydraulic chamber 4 and the side that allows the movement of the control piston 6,
It separates from the screw outer 26, whereby the micro switch 28 detects that the regulating member 7 has moved by a predetermined amount according to the operation of the DC motor 9.

The modulator main body 10 is integrally provided with an enlarged portion 10a having an output port 29 communicating with the wheel brake B, and a valve housing 32 of the normally open solenoid valve 2.
Is fitted and fixed to the enlarged portion 10a, and an annular passage 31 is formed between the valve housing 32 and the enlarged portion 10a and communicates with the output hydraulic chamber 4 via the communication passage 30 provided in the modulator body 10.

Within the valve housing 32 is an output port 29.
A valve seat 34 is provided so as to surround an inner end of a valve hole 33 communicating with the valve seat 33, and a valve element 35 which can be seated on the valve seat 34 is fixedly mounted on a tip of a drive rod 36. Then drive rod 3
6 is driven by an electromagnetic drive unit including a coil 38 and the like housed in a drive unit housing 37 that is connected to the valve housing 32. When the coil 38 is demagnetized, the drive rod 36 drives the valve body 35 to a valve. It is located at a position away from the seat 34, and when the coil 38 is excited, the drive rod 36 moves the valve body 35.
Is driven to the position where the valve seat 34 is seated.

The operations of the DC motor 9 and the normally open solenoid valve 2 are controlled by the control unit C, and the control unit C is connected with the micro switch 28 and the alarm device 39. The micro switch 28 is connected in series to an on / off switch (not shown) between the DC motor 9 and the power circuit.
Even if the on / off switch is in the conductive state, the rotation operation of the DC motor 9 is stopped in response to the micro switch 28 being cut off when the regulating member 7 moves by a predetermined amount according to the operation of the electric motor 9. Will be.

Next, the operation of this embodiment will be described with reference to FIG. 3. When the master cylinder M is operated to exert a braking pressure on the wheel brakes B, a normally open electromagnetic valve is provided at the beginning of the braking operation. Since the valve 2 is opened and the cut valve 5 is also opened in response to the stop of the DC motor 9, the braking which increases as the output pressure of the master cylinder M increases in response to the braking operation. The pressure will act on the wheel brake B.

When the wheels are about to lock at time t ₁ after the start of the braking operation, the control unit C starts energizing the DC motor 9. As a result, the control piston 6 moves to the side that increases the volume of the output hydraulic chamber 4, and the braking pressure decreases as the cut valve 5 closes and the volume of the output hydraulic chamber 4 increases. . By closing the normally open solenoid valve 2, the braking pressure is maintained.

When the screw outer 26, that is, the regulating member 7 moves by a predetermined amount in response to the rotation operation of the DC motor 9, the micro switch 28 is shut off to stop the rotation operation of the DC motor 9. Spring 8
_{When the} screw outer 26, that is, the restricting member 7 moves again in the direction of pressing the control piston 6 by the spring force of ₁ , 8 ₂ , the micro switch 28 becomes conductive and the DC motor 9
The rotation operation of will be restarted. In this way, the micro switch 28 repeats the rotation operation and stop of the DC motor 9, and the control piston 6 is
With the cut valve 5 kept closed, the output hydraulic chamber 4 is controlled to a position where the volume of the output hydraulic chamber 4 is substantially constant.

Moreover, by controlling the on / off of the normally open solenoid valve 2, the braking pressure is gradually reduced, and the operation timing and the opening time of the normally open solenoid valve 2 are controlled. This makes it possible to freely set the pressure reduction gradient when the braking pressure is reduced.

Time t after time T has passed from time t _1
When the increase of the braking pressure is started at ₂ , the energization of the electric power of the DC motor 9 is stopped, and the control piston 6 is placed on the side that reduces the volume of the output hydraulic chamber 4 by the spring force of both springs 8 ₁ and 8 _2. Press it. As a result, the braking pressure increases, but the braking pressure is increased stepwise by controlling the ON / OFF of the normally open solenoid valve 2 during this pressure increase. By controlling the operation timing and the valve opening time of the normally open solenoid valve 2, it becomes possible to freely set the pressure increasing gradient at the time of increasing the braking pressure.

Further, after stopping the anti-lock control,
When the micro switch 28 remains in the shut-off state, that is, when the control piston 6 remains in the position where the volume of the output hydraulic chamber 4 is increased, mechanical failure of the ball screw 23 or the like occurs. It can be determined that it has occurred, and in that case, the alarm 39 can be operated to notify the abnormality.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, a step motor or a linear motor can be used as the electric motor.

[0029]

As described above, according to the first aspect of the present invention, since the output hydraulic chamber is connected to the wheel brake through the electromagnetic opening / closing valve, the pressure reducing gradient and the pressure increasing during the antilock control are executed. The gradient can be freely changed by controlling the solenoid valve, and more precise antilock control can be executed.

In addition to the configuration of the invention according to claim 1, the device according to the invention according to claim 2 detects that the movement amount of the regulating member according to the operation of the electric motor has reached a predetermined amount. Since the detector for stopping the operation of the electric motor is provided, the control piston can be controlled to a substantially constant position where the volume of the output hydraulic chamber is increased without requiring a complicated circuit.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view with a cut valve open.

FIG. 2 is a vertical cross-sectional side view with the cut valve closed.

FIG. 3 is an operation timing chart.

[Explanation of symbols]

2 Normally open solenoid valve as an electromagnetic on-off valve 3 Input hydraulic chamber 4 Output hydraulic chamber 5 Cut valve 6 Control piston 7 Control member 8 ₁ , 8 ₂ Spring 9 DC motor as electric motor 28 Micro switch as detector B Wheel brake M Master cylinder

Claims (2)

[Claims] 1. An input hydraulic chamber (3) connected to a master cylinder (M), an output hydraulic chamber (4) connected to a wheel brake (B), and one end of the output hydraulic chamber (4). Control piston (6) facing the pressure control chamber, and a control piston (6) provided between the input hydraulic pressure chamber (3) and the output hydraulic pressure chamber (4) for increasing the volume of the output hydraulic pressure chamber (4). Cut valve (5) that closes according to the movement of the control valve (5), and a control member (7) connected to the control piston (6) on the opposite side of the output hydraulic chamber (4).
When a spring (8 _1, 8 ₂₎ to exert spring force in a direction for pressing the the regulating member (7) the control piston (6), against the spring force of the spring (8 _1, 8 ₂₎ Power In the braking hydraulic pressure control device including an electric motor (9) that supplies the restriction member (7) to the regulating member (7), the output hydraulic pressure chamber (4) is connected to the wheel brake (B) via the electromagnetic opening / closing valve (2). A braking fluid pressure control device characterized by the above. 2. A detector for stopping the operation of the electric motor (9) by detecting that the movement amount of the regulating member (7) has reached a predetermined amount according to the operation of the electric motor (9). 28)
The braking hydraulic pressure control device according to claim 1, further comprising: