JP2017081277A - Hydraulic brake system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the work of a worker when air in a reaction force chamber of a master cylinder is reduced.SOLUTION: A reservoir shut-off valve 86 between a reaction force chamber 62 and a reservoir 52 is brought into an open state, and a pressure-reducing valve 172 is brought into an open state. A pressurizing piston 34 is moved forward by a back surface hydraulic pressure control device 28. Although air in the reaction force chamber 62 is made to flow out to the reservoir 52 with a hydraulic fluid, the pressure-reducing valve 172 is in the open state, so that a stroke of the pressurizing piston 34 can be made large. Work for bringing a breeder plug of a brake cylinder into the open state is not needed, so that the work of a worker can be reduced, accordingly.SELECTED DRAWING: Figure 5

Description

  The present invention relates to air reduction in a hydraulic brake system.

  Patent Literature 1 describes a hydraulic brake system including an air reducing device that reduces air in a reaction force chamber of a master cylinder. In this hydraulic brake system, the hydraulic force is supplied to the back chamber behind the pressurizing piston, and then the reaction chamber is communicated with the reservoir. The pressurizing piston is advanced, and the air in the reaction force chamber is discharged to the reservoir together with the hydraulic fluid. Further, the bleeder plug of the brake cylinder connected to the pressurizing chamber in front of the pressurizing piston is opened by the operator.

JP2015-120297A

  The subject of this invention is reducing an operator's work, when reducing the air of a reaction force chamber.

Means and effects for solving the problem

  In the hydraulic brake system according to the present invention, the reservoir shutoff valve between the reaction chamber and the reservoir is opened, and the slip control pressure reducing valve provided corresponding to the brake cylinder is opened. At the same time, the pressure piston is advanced by the hydraulic pressure in the back chamber. As the pressurizing piston advances, the air in the reaction force chamber flows out together with the working fluid into the reservoir. However, since the pressure reducing valve is in the open state, the stroke of the pressurizing piston can be increased. As a result, the air in the reaction force chamber can be satisfactorily discharged. In addition, since the work of opening the bleeder plug of the brake cylinder is not required, the work of the operator can be reduced accordingly.

1 is a circuit diagram conceptually showing a hydraulic brake system according to an embodiment of the present invention. It is a figure which shows the periphery of brake ECU of the said hydraulic brake system. It is a flowchart showing the air reduction and hydraulic fluid filling program memorize | stored in the memory | storage part of the said brake ECU. It is a flowchart showing a part of said air reduction and hydraulic fluid filling program. It is a figure which shows the state in which air reduction is performed in the said hydraulic brake system. It is a figure which shows the state by which hydraulic fluid filling is performed in the said hydraulic brake system. It is a time chart in case the said air reduction and hydraulic fluid filling are performed. It is a circuit diagram showing notionally the hydraulic brake system concerning another embodiment of the present invention.

Embodiment of the Invention

  Hereinafter, a hydraulic brake system according to an embodiment of the present invention will be described with reference to the drawings. In the present hydraulic brake system, air reduction is performed, but air reduction is often performed at vehicle factories, inspection sites, and the like.

<Configuration of hydraulic brake system>
As shown in FIG. 1, the hydraulic brake system includes (i) hydraulic pressures provided on brake cylinders 6FL, 6FR of hydraulic brakes 4FL, 4FR provided on left and right front wheels 2FL, 2FR and left and right rear wheels 8RL, 8RR. Brake cylinders 12RL, 12RR of the brakes 10RL, 10RR, (ii) a hydraulic pressure generator 14 capable of supplying hydraulic pressure to the brake cylinders 6FL, 6FR, 12RL, 12RR, (iii) the brake cylinders 6FL, 6FR, 12RL, 12RR And a slip control device 16 provided between the hydraulic pressure generation device 14 and the like. The hydraulic pressure generator 14, the slip controller 16 and the like are controlled by the brake ECU 20 (see FIG. 2).
Hereinafter, in the present specification, when it is not necessary to distinguish the wheel position for hydraulic brakes, etc., when referring generically, etc., FL, FR, RL, RR, F, R, etc. representing wheel positions are omitted. There is. Further, the drawing is merely a conceptual diagram, and the length of the fluid passage and the connection position of the fluid passage shown in the drawing do not necessarily represent the length and the connection position in the actual hydraulic brake system.

The hydraulic pressure generator 14 includes (i) a brake pedal 24 as a brake operation member, (ii) a master cylinder 26, (iii) a rear hydraulic pressure controller 28 that controls the hydraulic pressure in the rear chamber of the master cylinder 26, and the like. .
The master cylinder 26 includes: (a) a housing 30 as a first housing; (b) pressurizing pistons 32 and 34 fitted in a cylinder bore formed in the housing 30 in series in a liquid-tight and slidable manner; Including a piston 36 and the like.
The fronts of the pressurizing pistons 32 and 34 are the pressurizing chambers 40 and 42, respectively. The brake cylinder 6 of the left and right front wheels 2 is connected to the pressurizing chamber 40 via a liquid passage 44, and the brake cylinder 12 of the left and right rear wheels 8 is connected to the pressurizing chamber 42 via a liquid passage 46. When the hydraulic pressure is supplied to the brake cylinders 6 and 12, the hydraulic brakes 4 and 10 are operated, and the rotation of the wheels 2 and 8 is suppressed. Further, each of the pressurizing pistons 32 and 34 is urged in the backward direction by the return springs 48 and 49, respectively. Communicated.

The pressure piston 34 includes (a) a front piston portion 56 as a first piston portion provided at the front portion, and (b) an intermediate piston portion as a second piston portion provided at an intermediate portion and projecting in the radial direction. 58 and (c) a rear small diameter portion 60 which is provided at the rear portion and has a smaller diameter than the intermediate piston portion 58. The front piston part 56 and the intermediate piston part 58 are fitted into the housing 30 in a liquid-tight and slidable manner, respectively. The front of the front piston part 56 is the aforementioned pressure chamber 42, and the front of the intermediate piston part 58 is An annular reaction force chamber 62 is provided. Further, a rear small-diameter portion 60 behind the intermediate piston portion 58 is fitted into an annular inner peripheral protrusion 64 provided in the housing 30 in a liquid-tight and slidable manner. As a result, a back chamber 66 is formed behind the intermediate piston portion 58.
The input piston 36 is located behind the pressurizing piston 34, and a space 70 is defined between the rear small diameter portion 60 and the input piston 36. The brake pedal 24 is linked to the rear portion of the input piston 36 via an operating rod 72 or the like. The separation chamber 70 is communicated with the master reservoir 52 at the retracted end position of the input piston 36.

The reaction force chamber 62 and the master reservoir 52 are connected by a reservoir passage 84, and a normally open reservoir shut-off valve (SSA) 86 is provided in the reservoir passage 84. In addition, the reservoir passage 84 and the separation chamber 70 are connected by the connection passage 80, and the reservoir passage 84 and the stroke simulator 90 are connected by the simulator passage 88. A normally closed communication cutoff valve (SGH) 82 is provided in the connection passage 80.
The master cylinder 26 is assembled to the vehicle in the posture shown in FIG. 1 (the posture in which the upper side in FIG. 1 is the upper side of the vehicle), but actually, the reservoir passage 84 is formed in the reaction force chamber in the upper part of the housing 30. 62. In other words, although the connection port 91 connected to the reservoir passage 84 is illustrated in the lower part of the housing 30 in FIG. 1, it is actually formed in the upper part of the housing 30.

A back hydraulic pressure control device 28 is connected to the back chamber 66. The back hydraulic pressure control device 28 includes (a) a high pressure source 100, (b) a regulator 102, (c) a moving force control device 104, and the like.
The high-pressure source 100 includes a pump device including a pump 105 and a pump motor 106, and an accumulator 108 that stores hydraulic fluid discharged from the pump device in a pressurized state. The accumulator pressure, which is the hydraulic pressure of the hydraulic fluid stored in the accumulator 108, is detected by the accumulator pressure sensor 109, but the pump motor 106 is controlled so that the accumulator pressure is maintained within a predetermined setting range. The
In the regulator 102, a cylinder bore having a stepped shape is formed in a housing 110 as a second housing, and a pilot piston 112 and a control piston 114 are fitted in a liquid-tight and slidable manner in a large-diameter portion. A high pressure chamber 116 connected to the high pressure source 100 is formed. The rear of the pilot piston 112 is a pilot pressure chamber 120. The rear of the control piston 114 is a control pressure chamber 122 and the front is a servo chamber 124.

A normally closed high-pressure supply valve 126 is provided between the servo chamber 124 and the high-pressure chamber 116. The control piston 114 has a low pressure passage 140 communicated with the master reservoir 52. The low pressure passage 140 opens at the front end portion of the control piston 114 and faces the high pressure supply valve 126. At the retracted end position of the control piston 114, the servo chamber 124 and the master reservoir 52 are communicated with each other via the low pressure passage 140. As the control piston 114 advances, the servo chamber 124 is disconnected from the master reservoir 52 and communicated with the high-pressure chamber 116, and the hydraulic pressure in the servo chamber 124 increases. The control piston 114 is urged rearward by the return spring 144.
The pilot pressure chamber 120 is connected to the liquid passage 46 through the pilot passage 152.
A back chamber 66 of the master cylinder 26 is connected to the servo chamber 124 via a servo passage 154. Since the servo chamber 124 and the back chamber 66 are directly connected, the hydraulic pressure in the servo chamber 124 and the hydraulic pressure in the back chamber 66 are basically the same height. A servo fluid pressure sensor 156 is provided in the servo passage 154 to detect the servo fluid pressure that is the fluid pressure in the servo chamber 124.
The moving force control device 104 includes a pressure-increasing linear valve (SLA) 160 provided between the control pressure chamber 122 and the high-pressure source 100, and a pressure-reducing linear valve (SLA) 160 provided between the control pressure chamber 122 and the master reservoir 52. SLR) 162. The pressure increasing linear valve 160 is a normally closed valve, and the pressure decreasing linear valve 162 is a normally open valve. The hydraulic pressure in the control pressure chamber 122 is controlled by the pressure increasing linear valve 160 and the pressure reducing linear valve 162, and the moving force of the control piston 114 is controlled.

The slip control device 16 is of a reflux type, and (i) holding valves 170FR, 170FL, pressure reducing valves 172FR, 172FL, (ii) provided corresponding to the wheel cylinders 6FR, 6FL of the left and right front wheels 2FR, 2FL, respectively. ) Holding valves 170RL, 170RR, pressure reducing valves 172RL, 172RR provided corresponding to the left and right rear wheels 8RL, 8RR, and (iii) pressure reducing reservoirs 174F provided on the front and rear sides, respectively. , R, (iv) a recirculation pump device 176 for returning the hydraulic fluid in the pressure reducing reservoirs 174F, R to the upstream side of the holding valve 170 in the liquid passages 44, 46, and the like. The holding valves 170FR, 170FL, 170RL, 170RR are provided between the pressurizing chambers 40, 42 and each of the wheel cylinders 6FR, 6FL, 12RL, 12RR. The pressure reducing valves 172FR, 172FL, 172RL, 172RR , 6FL, 12RL, 12RR and the decompression reservoirs 174F, R. The holding valve 170 is a normally open valve, and the pressure reducing valve 172 is a normally closed valve. The holding valve 170 and the pressure reducing valve 172 are electromagnetic valves that are operated by controlling the current supplied to the coil. The hydraulic pressures of the cylinders 6 and 12 are individually controlled.
Further, the decompression reservoirs 174F and R are connected to the upstream portion of the holding valve 170 of the liquid passages 44 and 46 by the pump passages 178F and R provided with the reflux pumps 180F and R, respectively. The reflux pumps 180F and R are driven by a common electric motor (hereinafter referred to as a reflux motor) 182. In the present embodiment, a pump device 176 is configured by the reflux pumps 180F and 180R, the reflux motor 182 and the like.

The brake ECU 20 is mainly a computer, and includes an execution unit 210, a storage unit 212, an input / output unit 214, and the like, as shown in FIG. The input / output unit 214 includes an accumulator pressure sensor 109, a servo hydraulic pressure sensor 156, a stroke sensor 200 that detects a stroke of the brake pedal 24, and an operating hydraulic pressure sensor that detects a hydraulic pressure corresponding to the operating force of the brake pedal 24. 201, a manual operation unit 202, a parking brake switch 204, and the like, and a solenoid valve such as a communication cutoff valve 82, a reservoir cutoff valve 86, a pressure-increasing linear valve 160, a pressure-decreasing linear valve 162, a holding valve 170, and a pressure-reducing valve 172 Coil, pump motor 106, reflux motor 182 and the like are connected. The operation fluid pressure sensor 201 detects the fluid pressure in the separation chamber 70 and the reaction force chamber 62 and detects the fluid pressure corresponding to the operation force of the brake pedal 10. The manual operation unit 202 is operated when instructing air reduction. The parking brake switch 204 detects whether or not the vehicle is in a stopped state. However, the parking brake switch 204 is not limited to the parking brake switch 204, and a shift position sensor, a wheel speed sensor, and the like may be connected.
The storage unit 212 is provided with an air reduction / working fluid filling program storage unit 216, and stores an air reduction / working fluid filling program and the like shown in the flowchart of FIG.

<Operation in hydraulic brake system>
[Normal control]
In the state shown in FIG. 1, in the regulator 102, the control piston 114 is in the retracted end position, and the servo chamber 124 is communicated with the master reservoir 52. In the master cylinder 26, the input piston 36 and the pressurizing pistons 32 and 34 are in the retracted end position, and the separation chamber 70 and the pressurization chambers 40 and 42 are communicated with the master reservoir 52.

When the hydraulic brakes 4 and 10 are operated, the communication cutoff valve 82 is opened and the reservoir cutoff valve 86 is closed. In the regulator 102, the pressure increasing linear valve 160 is opened and the pressure reducing linear valve 162 is closed. The control piston 114 is advanced, and the servo chamber 124 is disconnected from the master reservoir 52 and communicated with the high pressure chamber 116. The servo hydraulic pressure increases and is supplied to the back chamber 66. In the master cylinder 26, the pressurizing piston 34 is advanced by the hydraulic pressure in the back chamber 66, and the hydraulic pressure in the pressurizing chambers 40, 42 increases. The hydraulic pressure in the pressurizing chambers 40, 42 is supplied to the brake cylinders 6, 12, and the hydraulic brakes 4, 10 are operated.
When releasing the hydraulic brakes 4 and 10, in the regulator 102, the pressure-increasing linear valve 160 is closed and the pressure-reducing linear valve 162 is opened. The control piston 114 is retracted by a return spring 144 or the like, and the servo chamber 124 is communicated with the master reservoir 52. In the master cylinder 26, the back chamber 66 is communicated with the master reservoir 52, so that the pressurizing pistons 32, 34 are retracted by return springs 48, 49 and the like.

[Air reduction and hydraulic fluid filling]
In this embodiment, when the brake pedal 24 is not operated, the pressurizing pistons 32 and 34 are advanced under the control of the rear hydraulic pressure control device 28. Thereby, the volume of the reaction force chamber 62 is reduced, and the air is caused to flow out to the master reservoir 52 together with the hydraulic fluid, so that the air in the reaction force chamber 62 is reduced.
Further, the pressurizing pistons 32 and 34 are retracted by the control of the back surface hydraulic pressure control device 28 or the like. The volume of the reaction force chamber 72 is increased and the working fluid is supplied from the separation chamber 70 to the reaction force chamber 62, so that the reaction force chamber 62 is filled with the working fluid.

In this embodiment, when the vehicle is in a stopped state, the hydraulic brakes 4 and 10 are in an inactive state, and an air reduction command is issued, air reduction and hydraulic fluid filling are performed. Often performed in factories, inspection factories, etc.
The air reduction / working fluid filling program of FIG. 3 is executed at predetermined time intervals. In step 1 (hereinafter abbreviated as S1, the same applies to other steps), it is determined whether or not the vehicle is in a stopped state. In the present embodiment, it is determined that the vehicle is stopped when the parking brake switch 204 is ON. In S2, it is determined whether or not the hydraulic brakes 4 and 10 are in an inoperative state. For example, when no current is supplied to the coils of the pressure-increasing linear valve 160 and the pressure-decreasing linear valve 162, or when the brake pedal 24 is not depressed, it is assumed that it is in an inoperative state. In S3, it is determined whether an air reduction command has been issued. For example, when the manual operation unit 202 is operated, it is determined that there is an air reduction command when an operation that cannot be a normal driving operation is performed, for example, an accelerator pedal (not shown) is continuously depressed more than once. Can be.
If at least one of these determinations S1 to S3 is NO, air reduction / hydraulic fluid filling is not performed, but if all determinations are YES, in S4, the count value N of the counter is The initial value is set to 0, and air reduction and hydraulic fluid filling are executed in S5. The counter counts the number of executions of air reduction and hydraulic fluid filling, and in this embodiment, air reduction and hydraulic fluid filling is repeatedly executed a predetermined number of times Nth.

The execution of S5 is represented by the flowchart of FIG.
In S11 to S14, air reduction is performed as shown in FIGS. In S11, the communication shutoff valve (SGH) 82 is closed and the reservoir shutoff valve (SSA) 86 is opened, so that the reaction force chamber 62 is shut off from the separation chamber 70 and communicated with the master reservoir 52. . In S12, all the pressure reducing valves 172 are opened, so that the pressurizing chambers 40, 42 are communicated with the pressure reducing reservoirs 180F, R. In S13, the pressure-reducing linear valve (SLR) 162 is closed and the pressure-increasing linear valve (SLA) 160 is opened, so that the control piston 114 is advanced and the servo hydraulic pressure is increased. When the servo hydraulic pressure is supplied to the back chamber 66, the pressurizing pistons 32 and 34 are advanced. Since the brake pedal 24 is in a non-operating state and the input piston 36 is at the retracted end, the separation chamber 70 is communicated with the master reservoir 52.

As the pressurizing piston 34 advances, the volume of the reaction force chamber 62 is reduced, and as shown by a broken line 220 in FIG. In this case, as indicated by the broken line 222, the hydraulic fluid in the pressurizing chambers 40, 42 is caused to flow out to the decompression reservoirs 180F, R, so that the strokes of the pressurizing pistons 32, 34 can be increased. Thereby, the volume reduction amount of the reaction force chamber 62 can be increased, and the air present in the reaction force chamber 62 can be satisfactorily discharged to the master reservoir 52.
In S14, it is determined whether or not air reduction is completed. For example, when the elapsed time from the time when S11 to S13 is executed reaches the air reduction time which is a predetermined set time, it can be assumed that the air reduction is completed. The air reduction time is, for example, a time longer than the time when the pressure pistons 32 and 34 are estimated to have been advanced to the forward end (in other words, a time that can be considered to have been reliably advanced to the forward end), or For example, the time may be longer than the time when the air in the force chamber 62 is estimated to flow out to the downstream side of the reservoir shut-off valve 86.

When the air reduction is completed, as shown in FIGS. 6 and 7, the hydraulic fluid is filled in S15 to S19. In S15, the communication shutoff valve (SGH) 82 is opened and the reservoir shutoff valve (SSA) 86 is closed, so that the reaction force chamber 62 is shut off from the downstream side of the reservoir shutoff valve 86 in the reservoir passage 84. The separation chamber 70 is communicated. In S16, the pressure reducing linear valve (SLR) 162 is opened and the pressure increasing linear valve (SLA) 160 is closed, so that the control piston 114 is retracted by the return spring 144 or the like, and the servo chamber 124, The back chamber 66 is communicated with the master reservoir 52. In S17, all the pressure reducing valves 172 are closed, and in S18, the reflux motor 182 is operated. As indicated by the broken line 224, the hydraulic fluid stored in the decompression reservoirs 174 F, R is pumped up by the reflux pumps 180 F, R and returned to the pressurization chambers 40, 42. The volume of the reaction force chamber 62 is increased by the retraction of the pressurizing pistons 32 and 34, and hydraulic fluid is supplied from the separation chamber 70 as indicated by a broken line 226.
In S19, it is determined whether or not the filling of the hydraulic fluid is finished. For example, when the elapsed time from when S15 to S18 is executed reaches the working fluid filling time which is a predetermined set time, it can be assumed that the filling of the working fluid is completed. The hydraulic fluid filling time is, for example, a time longer than the time when the pressurizing pistons 32 and 34 are estimated to be returned to the retracted end, or the time longer than the time estimated to be filled with the hydraulic fluid in the reaction force chamber 62. You can do it.

  Thereafter, in S20, the recirculation motor 182 is stopped, and in S21, the count value N of the counter is incremented by 1 and becomes 1. The first air reduction and hydraulic fluid filling was completed. In S22, it is determined whether or not air reduction and hydraulic fluid filling has been performed a predetermined number of times Nth. If the number of executions is less than the set number, the determination is no and the process returns to S11. Thereafter, the pressurizing pistons 32 and 34 are similarly moved forward and backward to perform the second air reduction and hydraulic fluid filling. When the number N of executions of air reduction and hydraulic fluid filling reaches the set number Nth, the determination in S22 is YES, and in S23, an end process such as returning each solenoid valve to the original position shown in the figure is performed.

As described above, in this embodiment, the air pressure in the reaction force chamber 62 is reduced and the hydraulic fluid is filled by moving the pressure pistons 32 and 34 forward and backward by controlling the pressure increasing linear valve 160 and the pressure reducing linear valve 162. Done. Further, when air reduction is performed, the pressure reducing valve 172 is opened. The operator does not need to perform the operation of depressing the brake pedal 24 or the operation of opening the bleeder plug. Therefore, compared with the case of the hydraulic brake system described in Patent Document 1, the operator's work can be reduced.
In this embodiment, the pressure reducing valve 172 is opened when air is reduced. As a result, the strokes of the pressurizing pistons 32 and 34 can be increased, and the air in the reaction force chamber 62 can flow out into the master reservoir 52 satisfactorily.
In this case, the volume reduction amount ΔQ of the reaction force chamber 62 when air is reduced (see FIG. 7), for example, the reaction force chamber 62 until the pressurizing pistons 32 and 34 reach the forward end position from the backward end position. 1 is made larger than the volume of the portion R between the port 91 of the reservoir passage 84 and the downstream side portion of the reservoir shut-off valve 86, that is, the portion R surrounded by the one-dot chain line in FIG. As a result, in reducing the air, the air in the reaction force chamber 62 can be discharged to the downstream side of the reservoir shutoff valve 86. Then, after the air is reduced, the hydraulic fluid is filled. In this case, since the reservoir shut-off valve 86 is closed, the air in the reaction force chamber 62 that has flowed downstream from the reservoir shut-off valve 86 is It is possible not to return to the reaction force chamber 62.
Furthermore, when the hydraulic fluid is filled, the reflux motor 182 is operated, so that the hydraulic fluid stored in the decompression reservoir 174 can be quickly returned to the pressurizing chambers 40 and 42. The pressurizing pistons 32 and 34 can be quickly retracted, and the time required for filling the hydraulic fluid can be shortened.

  As described above, in this embodiment, the first reservoir corresponds to the master reservoir 52, and the second reservoir corresponds to the decompression reservoirs 174F and R. In addition, the air reducing device is configured by a portion that stores S11 to S14 of the air reduction / hydraulic fluid filling program of the brake ECU 20 and a portion that executes it, and a hydraulic fluid filling device that includes a portion that stores S15 to S19 and a portion that executes Is configured. Further, the pump operating unit is configured by a part for storing S18, a part for executing S18, and the like.

Note that it is not indispensable to operate the reflux motor 182 when filling the working fluid. When the recirculation motor 182 is deactivated, the pressure reducing valve 172 is left open, and the working fluid in the pressure reducing reservoirs 174F, R passes through the pressure reducing valve 172 and the holding valve 170 and the pressure chambers 40, 42. Returned to
Further, when air reduction is performed, the reservoir shut-off valve 86 can be switched from the closed state to the open state after the hydraulic pressure in the reaction force chamber 62 is increased in advance as described in Patent Document 1. .
Further, as shown in FIG. 8, in the master cylinder, a concave portion (air reservoir portion) 304 that is recessed upward is formed in a portion of the cylinder bore of the housing 300 corresponding to the front portion of the reaction force chamber 302, and the air reservoir portion. A port 91 can be provided in the opening 304. Since the air inside the reaction force chamber 302 is lighter than the hydraulic fluid, it is easy to accumulate in the air reservoir 304. As a result, as the volume of the reaction force chamber 302 decreases, the air present in the air reservoir 304 can quickly flow out to the reservoir passage 84, and flows out more reliably downstream of the reservoir shutoff valve 86. Can be made. Thereby, it is also possible to reduce the number of executions of air reduction and hydraulic fluid filling.

  In addition, the structure of the hydraulic brake system to which the present invention is applied is not limited. For example, the first housing 30 of the master cylinder 26 and the second housing 110 of the regulator 102 can be made common. In addition to the aspects described above, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.

  20: Brake ECU 26: Master cylinder 28: Back hydraulic pressure control device 52: Reservoir 62: Reaction force chamber 66: Back chamber 86: Reservoir shutoff valve 160: Pressure increase linear valve 162: Pressure reduction linear valve 202: Manual operation unit 216: Air reduction program storage

Patentable invention

(1) a brake cylinder of a hydraulic brake that suppresses rotation of the wheel;
(a) a first housing; and (b) a pressure piston having a first piston portion and a second piston portion that are fluid-tightly and slidably fitted to the first housing. A master cylinder in which the front of the piston portion is a pressurizing chamber connected to the brake cylinder, the front of the second piston portion is a reaction force chamber, and the rear of the pressurizing piston is a back chamber;
A reservoir shut-off valve that is provided in a reservoir passage that connects the first reservoir and the reaction force chamber, and that communicates or blocks the first reservoir and the reaction force chamber;
A back hydraulic pressure control device capable of controlling the hydraulic pressure in the back chamber;
(i) a second reservoir; (ii) a pressure reducing valve provided between the second reservoir and the brake cylinder; and (iii) a holding valve provided between the pressurizing chamber and the brake cylinder. A slip control device comprising:
The reservoir shut-off valve is opened, the pressure reducing valve is opened, and the pressurizing piston is advanced by controlling the back surface hydraulic pressure control device, so that the air in the reaction force chamber is transferred to the first reservoir. A hydraulic brake system comprising: an air reducing device that flows into the air.
The first reservoir and the second reservoir may be the same or different.
Further, in the air reducing device, the back surface hydraulic pressure control device may be controlled after the control of the back surface hydraulic pressure control device, or the back surface hydraulic pressure control device may be controlled in the open state of the reservoir cutoff valve. In the former case, the fluid is communicated with the first reservoir after the hydraulic pressure in the reaction force chamber becomes high, so that the air can flow out better than in the latter case.
(2) The master cylinder is (c) a return spring that urges the pressurizing piston to the rear, and (d) a liquid-tight and slidable rearward of the pressurizing piston with respect to the first housing via a separation chamber. An input piston movably fitted,
The hydraulic brake system includes a communication shut-off valve that allows communication between the separation chamber and the reaction force chamber, and shuts off the reservoir shut-off valve. Is opened, and the pressurizing piston can be retracted by the control of the back surface hydraulic pressure control device, so that the working fluid flows out from the separation chamber to the reaction force chamber, and the reaction force chamber The hydraulic brake system according to item (1), including a hydraulic fluid filling device that fills hydraulic fluid with the hydraulic fluid.
(3) The master cylinder includes an input piston that is liquid-tightly and slidably fitted to the first housing via a separation chamber behind the pressure piston.
The hydraulic brake system includes a communication shut-off valve that allows communication between the separation chamber and the reaction force chamber, and shuts off the reservoir shut-off valve. Is opened, and the pressurizing piston is retracted by the control of the back surface hydraulic pressure control device, so that the working fluid flows out from the separation chamber to the reaction force chamber, and the working fluid is supplied to the reaction force chamber. The hydraulic brake system according to item (1), including a hydraulic fluid filling device to be filled.
When the back chamber is communicated with the reservoir by the back fluid pressure control device, the pressurizing piston is retracted by the return spring and returned to the retracted end. This can be substantially referred to as “the pressure piston is retracted by the control of the back hydraulic pressure control device”. The volume of the reaction chamber is increased by the retraction of the pressurizing piston, and the working fluid is supplied from the separation chamber. As a result, the reaction chamber is filled with the working fluid.
(4) The slip control device includes a reflux type pump device that pumps up the hydraulic fluid in the second reservoir and returns it to the upstream side of the holding valve;
The hydraulic fluid filling device includes a pump operating unit that closes the pressure reducing valve and returns the hydraulic fluid stored in the second reservoir to the pressurizing chamber by operating the reflux pump device. The hydraulic brake system according to (2) or (3).
The hydraulic fluid stored in the second reservoir can be quickly returned to the pressurizing chamber by the operation of the pump device. Thereby, the working fluid filling time can be shortened.
(5) The volume reduction amount of the reaction force chamber due to the advance of the pressurizing piston by the air reduction device is larger than the volume of the portion of the reservoir passage from the master cylinder to the communication shut-off valve ( The hydraulic brake system according to any one of items 1) to (4).
The volume reduction amount of the reaction force chamber can be, for example, the volume reduction amount of the reaction force chamber when the pressurizing piston is advanced from the backward end position to the forward end position. The portion of the reservoir passage from the master cylinder to the communication cutoff valve is a portion between the master cylinder of the reservoir passage and the downstream side portion of the reservoir cutoff valve. In the hydraulic brake system described in this section, the air in the reaction force chamber can be discharged to the downstream side (master reservoir side) of the reservoir cutoff valve.
(6) The rear hydraulic pressure control device includes (i) a second housing, (ii) a control piston fitted in the second housing in a fluid-tight and slidable manner, and (iii) a front of the control piston. An output chamber connected to the back chamber, and (iv) a moving force control device that applies a moving force to the control piston and can control the moving force. The hydraulic brake system according to any one of the items.
The control piston is advanced by the control of the moving force control device, the hydraulic pressure in the output chamber is controlled, and the hydraulic pressure in the back chamber is controlled.
(7) The hydraulic brake system according to (6), wherein the moving force control device includes one or more electromagnetic valves connected to a control pressure chamber provided behind the control piston of the second housing. .
(8) The hydraulic brake according to any one of (1) to (7), wherein an air reservoir portion that is recessed upward is provided in a portion corresponding to the front portion of the reaction force chamber of the first housing. system.
Since the air is lighter than the hydraulic fluid, the air in the reaction force chamber easily moves upward and easily collects in the air reservoir. Further, if the port of the reservoir passage is formed by opening the air reservoir portion, the air in the air reservoir portion can be quickly discharged to the reservoir passage. As a result, the air can flow out to the downstream side of the reservoir shutoff valve.

(9) (a) a first housing; and (b) a pressure piston and an input piston fitted in series with each other via a separation chamber so as to be fluid-tight and slidable on the first housing,
The pressure piston has a first piston portion and a second piston portion;
A master cylinder in which the front of the first piston portion is a pressurizing chamber, the front of the second piston portion is a reaction force chamber, and the rear of the second piston portion is a back chamber;
A reservoir shut-off valve that is provided between the reaction force chamber and the reservoir, and that allows the reservoir and the reaction force chamber to communicate with or shut off;
A communication shut-off valve provided between the separation chamber and the reaction force chamber, for communicating or blocking the separation chamber and the reaction force chamber, and a rear hydraulic pressure control capable of controlling the hydraulic pressure of the rear chamber. Equipment,
The reservoir shut-off valve is opened, the communication shut-off valve is closed, and the pressurizing piston is advanced under the control of the back surface hydraulic pressure control device, whereby the air in the reaction force chamber is moved to the first reservoir. An air reducing device that flows into
The reservoir shut-off valve is closed, the communication shut-off valve is opened, and the pressurizing piston is retracted under the control of the back surface hydraulic pressure control device, so that the working fluid is transferred from the separation chamber to the reaction force chamber. And a hydraulic fluid filling device for supplying the hydraulic fluid.
The technical features described in any one of the items (1) to (8) can be employed in the hydraulic brake system described in this item.

Claims (5)

A hydraulic brake cylinder that suppresses the rotation of the wheels;
(a) a first housing; and (b) a pressure piston having a first piston portion and a second piston portion that are fluid-tightly and slidably fitted to the first housing. A master cylinder in which the front of the piston portion is a pressurizing chamber connected to the brake cylinder, the front of the second piston portion is a reaction force chamber, and the rear of the pressurizing piston is a back chamber;
A reservoir shut-off valve that is provided in a reservoir passage that connects the first reservoir and the reaction force chamber, and that communicates or blocks the first reservoir and the reaction force chamber;
A back hydraulic pressure control device capable of controlling the hydraulic pressure in the back chamber;
(i) a second reservoir; (ii) a pressure reducing valve provided between the second reservoir and the brake cylinder; and (iii) a holding valve provided between the pressurizing chamber and the brake cylinder. A slip control device comprising:
The reservoir shut-off valve is opened, the holding valve and the pressure reducing valve are opened, and the pressurizing piston is advanced by controlling the back surface hydraulic pressure control device so that the air in the reaction force chamber is A hydraulic brake system comprising: an air reducing device that flows into the first reservoir. The master cylinder includes an input piston that is liquid-tightly and slidably fitted to the first housing via a separation chamber behind the pressure piston.
The hydraulic brake system includes a communication shut-off valve that allows communication between the separation chamber and the reaction force chamber, and shuts off the reservoir shut-off valve. Is opened, and the pressurizing piston is retracted by the control of the back surface hydraulic pressure control device, so that the working fluid flows out from the separation chamber to the reaction force chamber, and the working fluid is supplied to the reaction force chamber. The hydraulic brake system according to claim 1, comprising a hydraulic fluid filling device to be filled. The slip control device includes a reflux type pump device that pumps up the working fluid in the second reservoir and returns it to the upstream side of the holding valve;
The hydraulic fluid filling device includes a pump operating unit that closes the pressure reducing valve and returns the hydraulic fluid stored in the second reservoir to the pressurizing chamber by operating the reflux pump device. The hydraulic brake system according to claim 2.   The volume reduction amount of the reaction force chamber due to the advance of the pressurizing piston by the air reducing device is made larger than the volume of the portion of the reservoir passage from the master cylinder to the communication shut-off valve. The hydraulic brake system according to any one of the above. (a) a first housing; and (b) a pressurizing piston and an input piston which are fitted in series with each other via a separation chamber so as to be fluid-tight and slidable in the first housing. The piston has a first piston portion and a second piston portion, the front of the first piston portion is a pressurizing chamber, the front of the second piston portion is a reaction force chamber, and the second piston A master cylinder whose rear chamber is the back chamber,
A reservoir shut-off valve that is provided between the reaction force chamber and the reservoir, and that allows the reservoir and the reaction force chamber to communicate with or shut off;
A communication shut-off valve provided between the separation chamber and the reaction force chamber, for communicating or blocking the separation chamber and the reaction force chamber, and a rear hydraulic pressure control capable of controlling the hydraulic pressure of the rear chamber. Equipment,
The reservoir shut-off valve is opened, the communication shut-off valve is closed, and the pressurizing piston is advanced under the control of the back surface hydraulic pressure control device, whereby the air in the reaction force chamber flows out to the reservoir. An air reduction device
The reservoir shut-off valve is closed, the communication shut-off valve is opened, and the pressurizing piston is retracted under the control of the back surface hydraulic pressure control device, so that the working fluid is transferred from the separation chamber to the reaction force chamber. And a hydraulic fluid filling device for supplying the hydraulic fluid.

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