JPH0578462B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an anti-skid control device for a vehicle, etc., and includes a discriminating device for monitoring wheel behavior in a piping system that connects a master cylinder and a wheel cylinder. a cutoff valve device that cuts off communication between the master cylinder and the wheel cylinder so as to be operated in response to a command from the wheel cylinder; and a slack valve device that can discharge the wheel cylinder side working fluid of the cutoff valve device to a secondary pipe. A valve device and a supply device that pressurizes the hydraulic fluid discharged to the secondary conduit and can re-supply it to the wheel cylinder are provided, and the hydraulic fluid discharged to the secondary conduit is connected to a variable volume storage. The present invention relates to an anti-skid brake control device that is stored in a fluid system.

[Prior art and its problems]

FIG. 4 shows the anti-skid brake control device previously proposed by the applicant.
The hydraulic pressure is supplied from the tandem master cylinder 1. A brake pedal 2 is connected to the tandem master cylinder 1, and one hydraulic pressure generating chamber is connected to a wheel cylinder of a front wheel 6 via a pipe 3, a switching valve device 4, and a pipe 5. It is assumed that the other hydraulic pressure generating chamber is connected to the wheel cylinder of the rear wheel via piping 7 and a device similar to that shown.

The switching valve device 4 is further connected to a reservoir 9 via a pipe 8.
connected to. Further, a hydraulic pump 10 and a solenoid valve 12 are arranged in a pipe connecting the wheel cylinder of the front wheel 6 and the reservoir 9. Hydraulic pump 10 is driven by motor 11 .

Next, details of the switching valve device 4 will be explained.

A stepped hole is formed in the main body 13 in the vertical direction, and a master cylinder pressure chamber 14 is formed in the upper hole, which is connected to the piping 3 through a through hole 20. Also, within this pressure chamber 14, a valve ball 16 is attached to a spring 1.
5, and is disposed at a predetermined distance l ₁ from the valve seat 17, which is the stepped portion of the stepped hole, in the normal illustrated state.

A plunger 18 is fitted into the center of the stepped through hole so as to be slidable in the vertical direction, and is biased upward by a spring 19 to cause its upper shaft portion 18c to protrude upward from the small diameter hole portion 13a. ing. That is,
The valve ball 16 is separated from the valve seat 17. A plurality of grooves 18 are formed in the peripheral wall portion that fits into the hole of the plunger 18.
A groove 18b is formed in the radial direction on the upper end surface, thereby facilitating fluid communication between the master cylinder pressure chamber 14 and the through hole 21 in the normal state shown. A pipe 5 is connected to the through hole 21 .

A loosening chamber 23 is formed in the lower hole portion of the stepped through hole, and this is connected to the pipe 8 via the through hole 22. Also, inside this relaxation chamber 23, a valve ball 25 is attached to a spring 2.
4, and is seated on the valve seat 26 as a stepped portion of the stepped hole in the normal illustrated state.

The lower shaft portion 18d of the plunger 18 has a small diameter hole 1
3b, it faces the valve ball 25 at a predetermined distance l ₂ in the normal illustrated state. this distance
l ₂ is greater than the predetermined distance l ₁ mentioned above. Therefore,
When the plunger 18 moves downward, the upper valve ball 16 first seats on the valve seat 17, and then,
The lower shaft portion 18d pushes down the valve ball 25 and the valve seat 26
It is configured so that it can be moved away from the seat. The lengths of the upper shaft portion 18c and lower shaft portion 18d of the plunger 18 are selected with this in mind.

A coil 27 is also wound around the peripheral wall of the main body 13, and when the coil 27 is excited, the plunger 18 made of a magnetic material is attracted downward by the magnetic force against the spring force of the spring 19. That is, it moves downward to close the upper valve ball 16 and open the lower valve ball 25.
Others 28 and 29 are seal rings.

Next, details of the reservoir 9 will be explained.

A piston 40 equipped with a seal member 39 is slidably fitted into the inner hole 33 of the main body 32, and is biased to the right by a spring 38 adjusted between the piston 40 and the lid 34. An air chamber 35 and a liquid storage chamber 36 are defined on both sides by the piston 40.
is in communication with the above-mentioned pipe line 8. The illustrated state shows a case where the amount of stored liquid is zero, and the piston 40 is in contact with the inner end wall 32a of the main body 32.

The control unit 30 performs various calculations and judgments based on the output of the wheel speed detector supplied to the input terminal 31 and generates a brake release signal and a re-applying signal. The output S ₁ in the electric line 51 connected to 27 becomes high level "1". Further, when the reload signal is generated, the outputs S ₂ and S ₃ in the electric lines 52 and 53 become high level "1".

When the output S ₁ is “1”, the coil 27 is excited and the output
When S ₂ and S ₃ are "1", the solenoid 12a of the solenoid valve 12
is excited, and the motor 11 is driven. Solenoid valve 1
2 is A when the solenoid 12a is not exemplified.
The state B is taken, and the wheel cylinder side of the wheel 6 and the hydraulic pump 10 side are cut off, but when the solenoid 12a is energized, the state B is taken, and they are communicated with each other.

The anti-skid control device 50 previously proposed by the present applicant is constructed as described above, and its operation will now be explained.

It is now assumed that a vehicle equipped with the present control device 50 and the master cylinder 1 is running at a constant speed. The output signals S ₁ , S ₂ , and S ₃ are all "0", and each part of the device 50 is in the state shown. It is now assumed that the brake pedal 2 is rapidly depressed in order to stop the vehicle.

Pressure fluid from the master cylinder 1 is supplied to the wheel cylinder of the wheel 6 through the pipe 3, the pressure chamber 14 of the switching valve device 4, the through hole 21, and the pipe 5. Although not shown, pressurized fluid is also supplied to the wheel cylinders of the rear wheels via the piping 7 and a device similar to the device 50 shown in the drawings, but only the system on the side of the rear wheels 6 shown in the drawings will be described below. . Although the other front wheel is not shown, it is assumed that it is connected to the piping 5 in parallel.

Since the coil 27 of the switching valve device 4 is not yet energized, the plunger 18 and the valve balls 16, 25 are in the state shown in the figure, and the pipe 3 side and the pipe 5 side are in communication, but the pipe 5 side is in communication with the pipe 3 side and the pipe 5 side. and the pipe 8 side are cut off. Therefore, the pressure fluid from the master cylinder 1 is supplied to the wheel cylinder of the front wheel 6 through the pressure chamber 14 and the through hole 21 of the switching valve device 4 as described above.

Although the hydraulic pressure from the master cylinder 1 acts on the upper surface of the lower valve ball 25, this pressure-receiving area is sufficiently small and the spring force of the spring 24 is sufficiently large to prevent the valve from opening.

As pressurized fluid is supplied to the wheel cylinders of the wheels 6, the brakes on the wheels 6 begin to apply. When the hydraulic pressure in the wheel cylinder increases and the control unit 30 determines that the brakes are being applied too much for a certain period of time, the output _S1 becomes "1". As a result, the coil 27 is excited, a downward attractive force is applied to the plunger 18, and the plunger 18 moves downward against the spring force of the spring 19. First, the upper shaft portion 18c is retracted downward from the small diameter hole portion 13a,
A valve ball 16 is seated on a valve seat 17. As a result, the pressure chamber 14, ie, the master cylinder 1 side, and the wheel cylinder side of the wheel 6 are cut off. Next, the lower shaft portion 18d comes into contact with the valve ball 25 and pushes it down against the spring force of the spring 24. As a result, the loosening chamber 23, that is, the reservoir 9 side and the wheel cylinder side of the wheel 6 are brought into communication. Pressure fluid from the wheel cylinder of the wheel 6 is discharged into the reservoir 9 through the through hole 21, the small diameter hole 13b, and the loosening chamber 23. Therefore, the braking force of the wheels 6 decreases. In the reservoir 9, the piston 40 moves to the left according to the amount of liquid stored.

If the control unit 30 determines that the brake is too loose at a certain time and needs to be re-applied, the output _S1 becomes "0" and the outputs _S2 and _S3 become "1". The motor 11 rotates and the solenoid 12a of the electromagnetic valve 12 is energized. On the other hand, the coil 27 of the switching valve device 4 is de-energized and the plunger 18
is moved upward by the spring force of the spring 19. The lower valve ball 25 is seated on the valve seat 26, and the wheel cylinder side and the reservoir 9 side are cut off. On the other hand, the upper shaft portion 18c of the plunger 18 is connected to the upper valve ball 16.
However, the hydraulic pressure in the master cylinder 1 continues to rise even after the above-mentioned brake release starts, and the valve ball 16 comes into contact with the valve ball 16.
There is a large pressure difference between the top and bottom of the valve ball 16.
is not pushed up by the upper shaft portion 18c. That is, the master cylinder 1 side and the wheel cylinder side are still in a disconnected state. Therefore, if the output _S2 of the control unit 30 is not set to "1" immediately after the end of the brake release signal, the solenoid valve 12 is in state A, so that the hydraulic pressure in the wheel cylinder is reduced. It can be held constant immediately after.

As the outputs S ₂ and S ₃ become "1", the solenoid valve 12 becomes in state B, and the hydraulic pump 10 sucks brake fluid from the fluid storage chamber 36 of the reservoir 9 and supplies pressure fluid to the wheel cylinder. 6's braking force increases.

However, when the liquid in the liquid storage chamber 36 of the reservoir 9 runs out, that is, when the piston 40 moves to the right and comes into contact with the inner end wall 32a of the main body 32, even though the hydraulic pump 10 is driven, the wheels 6 The hydraulic pressure in the wheel cylinder does not increase any further and remains constant thereafter. This is not a problem as long as the coefficient of friction of the road surface on which the vehicle travels does not vary significantly, but if the road surface changes from a low-friction road surface to a high-friction road surface, the braking force will be insufficient if the braking force is held constant.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above problems, and an object of the present invention is to provide an anti-skid brake control device that can further increase the braking force even when the amount of liquid stored in the reservoir becomes zero.

[Means for solving problems]

The above object is to provide a second pipe that directly communicates the master cylinder and the wheel cylinder in the configuration described at the beginning, and to this second pipe,
This is achieved by an anti-skid brake control device which is provided with a valve device that closes when the amount of liquid stored in the liquid storage device is present.

[Effect]

When the discrimination device issues a brake release command, the cutoff valve device closes, and the master cylinder side and the wheel cylinder side are cut off. On the other hand, in the release valve device, the open wheel cylinder side and the liquid storage device side communicate with each other.
Hydraulic pressure from the wheel cylinder is vented into the reservoir and the brake is released. When the liquid storage device starts storing liquid, the valve device in the second pipe is closed.

When the discrimination device issues a brake reloading command, the release valve device closes, but the cutoff valve device also remains closed due to the differential pressure between the wheel cylinder side and the master cylinder side. Therefore, initially, the supply device sucks hydraulic fluid from the fluid storage device and supplies pressurized fluid to the wheel cylinders to increase the braking force.

When the amount of liquid stored in the liquid storage device becomes zero, a valve device in the second pipe opens, and the master cylinder side and the wheel cylinder side are directly connected. Therefore, the shutoff valve device is still closed due to the differential pressure, but pressurized fluid is supplied directly from the master cylinder to the wheel cylinder via the second pipe, and as long as the brake refill command continues, the brake force will be reduced. can be increased.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Anti-skid brake control devices according to embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

Although FIG. 1 shows a first embodiment of the present invention, parts corresponding to those in FIG. 4 showing a conventional example are given the same reference numerals, and detailed explanation thereof will be omitted.

The reservoir valve device 100 has a bubble section 100
A and a reservoir part 100B, and the main body 51 is integrated. Stepped hole 55 extending to the left and right
A reservoir piston 53 is inserted into the large diameter hole of the sealing member 5.
4 is attached and slidably fitted, and the lid body 52
It is biased to the right by a spring 56 arranged between. An air chamber 57 and a liquid storage chamber 58 are defined on both sides by the reservoir piston 53.
8 communicates with the conduit 8 via a through hole 59. The illustrated state shows a case where the amount of liquid stored is zero, and the reservoir piston 53 is connected to the inner end wall 5 of the large diameter hole of the main body 51.
It is in contact with 1a.

A bypass cut piston 60 is sealed with a cup seal 61 and slidably fitted into the small diameter hole portion of the stepped hole 55, and its right end protrudes into the master cylinder pressure chamber 66, and the tip shaft portion 60a is It is in contact with a valve ball 62 disposed within a valve chamber 65 .
The valve ball 62 is urged to the left by the valve spring 63,
In the normal illustrated state, the valve is separated from the valve seat 69. The bypass cut piston 60 is always biased to the left by the spring force of the valve spring 63 via the valve ball 62, and in the normal state shown, the reservoir piston 5
It is in contact with 3.

A through hole 67 is formed in transverse communication with the master cylinder pressure chamber 66, and is connected to the master cylinder 1 via conduits 68 and 3. A throttle passage 67a is formed within the through hole 67. Further, the valve chamber 65 is connected to a wheel cylinder of the wheel 6 via a conduit 70 connected to the through hole 64.

As described above, the reservoir section 100B is constituted by the reverser piston 53 and the spring 56, and the valve section 100B is constituted by the bypass cut piston 60, the cup seal 61, the valve ball 62, and the valve spring 63.
00A is configured. When the hydraulic pressure on the master cylinder side, and therefore on the wheel cylinder side, becomes zero due to the cup seal 61, if brake fluid remains in the fluid storage chamber 58, the hydraulic pressure due to the spring force of the spring 56 of the reservoir portion 100B It is configured to open the valve and return to the master cylinder 1 through the conduit 70.

The first embodiment of the present invention is constructed as described above, and its operation will be explained next. The functions of the components other than the reservoir valve device 100 are the same as those of the conventional example shown in FIG. 4, so only the functions of the reservoir valve device 100 will be mainly described.

When the control unit 30 issues a brake release command, the plunger 18 in the switching valve device 4 moves downward to close the valve ball 16, causing the valve ball 25 to close.
opens. Pressure liquid from the wheel cylinder of the wheel 6 flows into the liquid storage chamber 58 of the reservoir portion 50B of the reservoir valve device 100 via the pipe line 8. As a result, the reservoir piston 53 moves to the left,
The valve ball 62 is pushed against the valve seat 69 by the spring force of the valve spring 63.
sit down. Master cylinder pressure chamber 66 and valve chamber 65
is cut off from.

The hydraulic pressure in the wheel cylinder of the wheel 6 decreases.
The hydraulic pressure in the valve chamber 65 that communicates with this valve chamber also decreases, and the hydraulic pressure in the master cylinder pressure chamber 66 that communicates with the master cylinder 1 still increases. This creates a pressure difference on both sides of the valve ball 62, but the seating area of the valve ball 62 is sufficiently small and the spring force of the valve spring 63 is sufficiently large that the valve cannot open due to this pressure difference. shall be.

When the control unit 30 issues a brake reload command, the plunger 18 moves upward in the switching valve device 4 and closes the lower valve ball 25, but the upper valve ball 16 cannot be opened due to the differential pressure. Unable to do so, it remains closed.

Brake fluid is sucked in from the fluid storage chamber 58 of the reservoir portion 100B by the hydraulic pump 10, and the pressure fluid is supplied to the wheel cylinders of the wheels 6. The hydraulic pressure in the wheel cylinder increases and the braking force increases.

The reservoir piston 53 moves to the right as the braking force increases, and eventually comes into contact with the inner end wall 51a. That is, the amount of liquid stored in the liquid storage chamber 58 becomes zero. Conventionally, it has not been possible to increase the hydraulic pressure in the wheel cylinder beyond the hydraulic pressure at this time.

However, according to this embodiment, the valve part 100
At A, the valve ball 62 is connected to the bypass cut piston 6
By opening the valve with 0, the master cylinder side and the wheel cylinder side communicate with each other, making it possible to drive the cylinder. That is, the pressure fluid from the master cylinder 1 is supplied into the master cylinder pressure chamber 66 through the pipes 3 and 68 and the through hole 67, and from there, it is further passed through the valve chamber 65 and the pipe 70 to the wheel of the wheel 6. The hydraulic pressure can be further increased by being supplied to the cylinder. After the above-mentioned brake release starts, the hydraulic pressure in the master cylinder 1 has further increased, but since it is supplied to the wheel cylinder side through the throttle passage 67a in the through hole 67, the wheel tends to lock. is prevented.

As the hydraulic pressure in the wheel cylinder increases, the differential pressure on both sides of the upper valve ball 16 (closed) in the switching valve device 4 becomes smaller, and the spring force of the spring 19 that urges the plunger 18 upward becomes stronger. When the size becomes larger, the plunger 18 moves upward to open the valve ball 16 and remove the valve from the master cylinder 1 to the switching valve device 4 and the pipe line 5.
Pressure fluid can be supplied to the wheel cylinders even through the

When the control unit 30 issues the brake release command again, the switching valve device 4 switches the valve ball 16 to the closed state and the valve ball 25 to the open state, and the reservoir portion 100B of the reservoir valve device 100 is connected to the wheel cylinder. pressure fluid is discharged, the reservoir piston 53 moves to the left, and the valve part 100
A valve ball 62 closes again. As a result, the pipe line 68
and 70 are cut off, and the hydraulic pressure in the wheel cylinder decreases.

As described above, anti-skid control is performed and the brakes are applied appropriately without locking the wheels 6. When the pedal pressure on the brake pedal 2 is released, the pressure fluid in the wheel cylinder returns to the master cylinder 1 through the pipe line 5, the switching valve device 4, and the pipe line 3.
If brake fluid remains in the fluid storage chamber 58 at 0, the cup seal 61 is opened by the hydraulic pressure exerted by the spring 57, and the master cylinder pressure chamber 66, the through hole 67, and the conduits 68, 3 are opened. is returned to the master cylinder 1 through.

FIG. 2 shows a reservoir valve device 200 in a second embodiment of the invention, which is otherwise identical to FIG.

That is, connection holes 72 and 73 are formed in the main body 71, and the conduits 68 and 8 in FIG. 1 are connected to these, respectively. A connecting hole 89 is formed in the lid 88 to which a seal ring 95 is attached and screwed to the right opening end of the stepped hole 74, and this is connected to the conduit 70 in FIG.

This reservoir valve device 200 also has a valve section 20.
0A and a reservoir portion 200B. In the reservoir portion 200B, the reservoir piston 7 has a sealing member 80 attached to the large diameter hole of the stepped hole 74.
7 is slidably fitted, and is biased to the right by a spring 78 stretched between the lid 75 and the lid 75. An air chamber 79 and a liquid storage chamber 81 are defined on both sides by the piston 77, and the liquid storage chamber 81 communicates with the conduit 8 via the above-mentioned connection hole 73. The illustrated state shows a case where the amount of liquid stored is zero, and the piston 77
is in contact with the inner end wall 71a of the large diameter hole of the main body 71.

In the valve portion 200A, the bypass cut piston 82 is sealed with a cup seal 83 and is slidably fitted into the small diameter hole of the stepped hole 74, and the right end thereof is fitted with a seal ring 86 and inserted into the stepped hole. It protrudes into a cylindrical body 85 fitted into a medium-diameter hole 74 . The inner hole of the cylindrical body 85 is the master cylinder pressure chamber 84, and communicates with the above-mentioned connection hole 72 via a throttle passage 87 formed in the peripheral wall of the cylindrical body 85.

A valve chamber 90 is formed in the above-mentioned lid body 88 in communication with a connecting hole 89, and a valve body 91 biased leftward by a valve spring 92 is disposed in this chamber. A valve ball 93 is fixed to this left end face, and is spaced from a valve seat 94 formed at the right end of the cylinder body 85 in the normal illustrated state. The bypass cut piston 82 is connected to the valve body 9
1 and the valve spring 92 via the valve ball 93,
It is biased to the left and comes into contact with the valve ball 93. 9
6 is a cap seal presser. 97 is a filter.

This embodiment also operates in almost the same way as the first embodiment, so a brief explanation will be given below.

When the brake is released, pressure fluid from the wheel cylinder is discharged into the fluid storage chamber 81 through the connection hole 73. The reservoir piston 77 moves to the left to store brake fluid. Reservoir piston 77
As the bypass cut piston 82 moves to the left, the valve body 91 and therefore the valve ball 93 move to the left.
It is seated on the valve seat 94 by the spring force of 2. As a result, master cylinder pressure chamber 84 and valve chamber 90 are isolated. That is, the master cylinder side and the wheel cylinder side are cut off.

When refilling the brake, the reservoir piston 77 moves to the right as the brake fluid flows out. When the amount of stored liquid becomes zero, the bypass cut piston 82
As a result, the valve ball 93 is closed, the master cylinder side and the wheel cylinder side are brought into communication, and pressurized fluid is supplied from the master cylinder 1 to the wheel cylinder. Since it passes through the throttle passage 87, the wheels are prevented from moving toward locking. When the brake pedal 2 is released and brake fluid remains in the fluid storage chamber 81, the reservoir piston 77 moves to the right due to the spring force of the spring 78, and the cup seal 8
3 is opened, and the brake fluid is returned to the master cylinder 1 side.

FIG. 3 shows a reservoir valve device 300 according to a third embodiment of the invention, which is otherwise identical to FIG.

That is, the main body 101 has connection holes 102 and 10.
3 are formed, to which the conduits 8 and 70 in FIG. 1 are connected, respectively. Also, stepped hole 1
A connecting hole 106 is formed in the lid body 105 to which a seal ring 107 is attached and screwed to the left open end of the lid 104, and this is connected to the conduit 68 in FIG.

This reservoir valve device 300 also has a valve section 30.
0A and a reservoir portion 300B. In the reservoir portion 300B, a reservoir piston 111 is connected to a sealing member 11 in a large diameter hole portion of a stepped hole 104.
The seal ring 109 is attached to the right opening end of the stepped hole 104 and is biased to the right by a spring 113 stretched between the seal ring 109 and the inner wall 101a of the main body 101. In the normal state shown in the figure, it is in contact with the inner end surface of the lid body 108 which is attached and screwed. An air chamber 116 and a liquid storage chamber 124 are defined on both sides of the reservoir piston 111, and the figure shows a state in which the amount of liquid stored is zero. Air chamber 116 is through hole 1
17 communicates with the atmosphere. Also, the liquid storage chamber 12
4 communicates with the conduit 8 via the above-mentioned connection hole 102.

In this embodiment, the bypass cut piston 114 of the valve portion 300A is arranged to slidably penetrate the reservoir piston 111, and its head 114c is located in the recess 110 of the lid 108, and the flange portion 1
14a and the bottom of the recess 110 biases the flange portion 1 to the left.
14a comes into contact with the reservoir piston 111, thereby restricting its leftward position. A seal ring 1 is provided between the inner hole of the reservoir piston 111 and the shaft portion 114b of the bypass cut piston 114.
25 is interposed between the air chamber 116 and the liquid storage chamber 12.
4 is being sealed.

Shaft portion 114b of bypass cut piston 114
penetrates the hole in the inner wall portion 101a and protrudes into the large diameter hole on the left, and the sealing member 118 is inserted into this hole.
It is sealed by. The tip of the shaft portion 114b is located in a recess formed at the right end of the lid 105, and the valve ball 119 is fixed therein. Shaft portion 114b
An annular valve chamber 126 is formed around the tip of the lid body 105, which is connected to the through hole 1 formed in the radial direction of the lid body 105.
23 and the above-mentioned connection hole 103 to the conduit 7
It communicates with 0.

A master cylinder pressure chamber 125 is further formed in the lid body 105 as an axial passage in communication with the connection hole 106, and a valve seat 120 for a valve ball 119 is formed in the right end opening of the master cylinder pressure chamber 125. In the normal illustrated state, the valve ball 126 is separated from the valve seat 120, and the master cylinder pressure chamber 125 and the valve chamber 126 are communicated with each other.

In addition, the master cylinder pressure chamber 125 is connected to the throttle passage 1
It communicates with the connection hole 106 via 21, and 12
2 is a filter.

This embodiment also operates in the same way as the first embodiment, and will be briefly explained as follows.

When the brake is released, pressurized fluid from the wheel cylinder is discharged into the fluid storage chamber 124 through the connection hole 102. The reservoir piston 111 moves to the left to store brake fluid. As the reservoir piston 111 moves, the bypass cut piston 1
14 is also moved to the left, and the valve ball 119 is connected to the valve spring 115.
It is seated on the valve seat 120 by the spring force of. As a result, master cylinder pressure chamber 125 and valve chamber 126 are isolated. That is, the master cylinder side and the wheel cylinder side are cut off.

When refilling the brake, the reservoir piston 111 moves to the right as the brake fluid flows out.
When the amount of stored liquid reaches zero, the bypass cut piston 114 is pushed to the right to open the valve ball 119 just before it comes into contact with the lid 108, and the master cylinder side and the wheel cylinder side are brought into communication. Pressure fluid is supplied from the master cylinder 1 to the wheel cylinders. Since it passes through the throttle passage 121, the wheels are prevented from moving toward locking.

As mentioned above, each embodiment of the present invention has been described.
Of course, the present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, in the reservoir valve device, a bypass cut piston that contacts the reservoir piston is used to open and close the valve in the valve section. The position may be detected electrically, and a solenoid valve provided in the second pipe may be opened and closed thereby. Further, the reservoir section and the valve section may be formed separately.

〔Effect of the invention〕

As described above, according to the anti-skid brake control device of the present invention, the hydraulic pressure in the wheel cylinder can be increased as long as the refill command is issued. As with conventional systems, when the liquid storage device runs out of liquid, the fluid pressure cannot be increased any further, and the braking distance becomes longer when the road changes from a low μ road surface to a high μ road surface. Never.

[Brief explanation of drawings]

FIG. 1 shows a piping and wiring system diagram of an anti-skid brake control device according to a first embodiment of the present invention, and a second
FIG. 3 is a sectional view of essential parts of an anti-skid brake control device according to a third embodiment of the present invention, and FIG. FIG. 4 is a piping and wiring system diagram of a conventional anti-skid brake control device. In the figure, 100, 200, 300...
Reservoir valve device, 60, 82, 114...
Bypass cut piston, 62, 94, 119...
...Valve ball, 69,93,120...Valve seat, 68...
Pipe line, 67... through hole, 72, 106... connection hole.

Claims (1)

[Claims] 1. A shutoff valve device is installed in a piping system that communicates the master cylinder and the wheel cylinder, and the cutoff valve device shuts off communication between the master cylinder and the wheel cylinder so as to be activated in response to a command from a discrimination device that monitors the behavior of the wheel. , a release valve device capable of discharging the working fluid on the wheel cylinder side of the cutoff valve device to a secondary conduit, and a supply device capable of pressurizing the hydraulic fluid discharged to the secondary conduit and resupplying it to the wheel cylinder. In the anti-skid brake control device, the master cylinder and the wheel cylinder are directly connected to each other, and the hydraulic fluid discharged to the secondary pipe is stored in a variable volume liquid storage device. An anti-skid brake control device, wherein a second pipe is provided, and the second pipe is provided with a valve device that closes when the amount of liquid stored in the liquid storage device is present.