JP2008213633A - Brake fluid pressure control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing costs, and to decrease power consumption. <P>SOLUTION: This brake fluid pressure control device for a vehicle is provided with a simulator change-over valve 30 provided in a hydraulic pressure passage between a master cylinder and a stroke simulator 40. It opens when the differential pressure between brake fluid pressure on a master cylinder side and that on a wheel brake side becomes valve opening pressure to allow the inflow of a brake fluid to the stroke simulator 40, and closes when the differential pressure therebetween becomes valve closing pressure to cut off the inflow and to give the brake fluid pressure of the master cylinder to the wheel brake. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle brake hydraulic pressure control device.

  2. Description of the Related Art Conventionally, there has been known a vehicle brake hydraulic pressure control device that controls a braking force in an interlocking brake of a vehicle such as a motorcycle, a three-wheeled vehicle, an all-terrain vehicle (ATV), etc. by pressurizing hydraulic pressure with a pump. (For example, refer to Patent Document 1). This apparatus has a stroke simulator that applies an operation reaction force corresponding to the operation of the brake operator to the brake operator.

  The vehicle brake hydraulic pressure control device disclosed in Patent Document 1 includes an electric brake hydraulic pressure control mode and a mechanical brake hydraulic pressure control mode, and a stroke simulator is used when the electric brake hydraulic pressure control mode is executed. Is applied to the brake operation element according to the operation of the brake operation element. In addition, when an abnormality occurs in the execution of the electric brake fluid pressure control mode, the components related to the electric brake fluid pressure control mode are turned off, and the operation shifts to the mechanical brake fluid pressure control mode, corresponding to the brake operation amount. By supplying the brake fluid pressure directly to the wheel cylinder, a fail-safe function can be realized.

  Further, the vehicle brake hydraulic pressure control device disclosed in Patent Document 2 can also perform braking by an interlocking brake. This vehicle brake fluid pressure control apparatus is configured to include a stroke simulator and a pump for increasing the brake fluid pressure acting on the wheel brake, with the magnitude of the brake fluid pressure being electrically controlled.

JP 2002-264787 A JP 2006-123767 A

  By the way, in the above-described vehicle brake hydraulic pressure control device of Patent Document 1 and Patent Document 2, the master cylinder and the stroke simulator are communicated and disconnected via an electromagnetic valve. For this reason, an electromagnetic valve, an electric part for controlling the electromagnetic valve, and the like are necessary, and the number of parts is increased, the cost is increased, and the power consumption is increased.

  From such a point of view, the present invention provides a vehicle brake hydraulic pressure control device that can reduce manufacturing costs and power consumption in a vehicle brake hydraulic pressure control device equipped with a stroke simulator. The task is to do.

  In order to solve such a problem, the vehicle brake hydraulic pressure control device according to the present invention includes a hydraulic pressure path extending from a master cylinder that generates brake hydraulic pressure in accordance with a stroke amount of a brake operator to a wheel brake. A brake hydraulic pressure control device for a vehicle including a system, wherein the brake system is provided in a regulator having a cut valve that opens and closes the hydraulic pressure path, a suction path that bypasses the regulator, and the suction path, A pump that sucks brake fluid on the master cylinder side of the regulator and discharges the brake fluid to the wheel brake side of the regulator; and a suction valve that opens and closes the suction path on the suction side of the pump. Further, provided in the fluid pressure path, the brake fluid pressure from the master cylinder is introduced and the operation of the brake operator is counteracted. Is provided in the hydraulic pressure path between the master cylinder and the stroke simulator, and is applied to the brake hydraulic pressure generated in the master cylinder and the wheel brake. A simulator switching valve that is operated by the brake fluid pressure and communicates and blocks between the master cylinder side and the stroke simulator side, and the simulator switching valve is a normally closed valve, When the differential pressure between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve opening pressure, the valve opens, allowing the brake fluid to flow into the stroke simulator, and Closed when the differential pressure between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure. To block the inflow of the brake fluid to the stroke simulator, characterized by applying the brake fluid pressure of the master cylinder to the wheel brake.

  According to this vehicular brake hydraulic pressure control device, for example, when the increased brake hydraulic pressure acts on the wheel brake by operating the pump, the brake hydraulic pressure flows into the simulator switching valve, and the master cylinder side When the pressure difference between the brake fluid pressure of the vehicle and the brake fluid pressure on the wheel brake side becomes the valve opening pressure, the valve is opened and the brake fluid is allowed to flow into the stroke simulator. When the brake operator is operated from this state, the brake fluid pressure on the master cylinder side flows into the stroke simulator through the simulator switching valve, so that the operation reaction force of the brake operator is simulated against the brake operator. To be granted. And when the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, the valve is closed and the flow of brake fluid to the stroke simulator is shut off. The brake fluid pressure is applied to the wheel brake. In other words, in the present invention, communication / blocking between the master cylinder side and the stroke simulator side is preferably performed by a simulator switching valve that is operated by the brake fluid pressure generated in the master cylinder and the brake fluid pressure applied to the wheel brake. Can be done. Therefore, unlike the prior art, an electromagnetic valve for performing communication / blocking of these is not required, and no electrical wiring is required for that purpose, thereby reducing costs. In addition, since this solenoid valve is not required, it becomes easier to set up the layout including other solenoid valves, etc., it is easy to set up the hydraulic pressure path etc. related to communication / shut-off, and the degree of freedom of parts assembly Rise.

  In addition, the simulator switching valve closes when the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, blocking the flow of brake fluid into the stroke simulator. Since the brake fluid pressure of the master cylinder is applied to the wheel brake, the transition from when the brake fluid pressure is acting on the stroke simulator side to when the brake fluid pressure is acting on the wheel brake side is smooth. The operation feeling of the brake operator is improved.

  In the present invention, the simulator switching valve is moved by receiving a brake fluid pressure on the wheel brake side, a one-way valve that allows the brake fluid to flow from the stroke simulator side to the master cylinder side, A pressing member that presses and separates the valve body of the one-way valve and an urging unit that urges the pressing member in a direction in which the one-way valve is seated may be provided.

With this configuration, as described above, when the pump is operated, the increased brake fluid pressure acts on the wheel brake, and the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side are increased. When the pressure difference becomes the valve opening pressure, the pressing member moves against the urging force of the urging means, and presses and separates the valve body of the one-way valve. This allows the brake fluid to flow into the stroke simulator. When the brake operator is operated from this state, the brake hydraulic pressure on the master cylinder side flows into the stroke simulator through the one-way valve that is separated, and the operation reaction force of the brake operator is simulated against the brake operator. To be granted. When the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, it is moved in the direction in which the one-way valve is seated by the urging means, and the valve is closed. Inflow of brake fluid to is blocked. As a result, the brake fluid pressure on the master cylinder side is applied to the wheel brake.
As described above, the simulator switching valve having a simple configuration can suitably perform communication / blocking between the master cylinder side and the stroke simulator.

  In the present invention, when the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, the one-way valve is moved by the biasing means. It is good to be the structure which moves to the seating direction. With this configuration, the brake fluid pressure of the master cylinder is applied to the wheel brake, whereby the operation reaction force of the brake operator becomes continuous and the operation feeling becomes good.

  Further, in the present invention, when the brake fluid pressure is applied to the wheel brake corresponding to one of the brake systems, the pump corresponding to the other brake system is operated. And it is good also as a structure by which brake hydraulic pressure is provided also to the said wheel brake corresponding to the said brake system | strain. According to such a configuration, when the brake operator of one brake system is operated, the brake hydraulic pressure is applied to the wheel brake corresponding to the other brake system, and the brake hydraulic pressure increased by the pump is It will be given to the wheel brake. Then, this increased brake fluid pressure also flows into the simulator switching valve, and opens when the differential pressure between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve opening pressure. Thus, the brake fluid is allowed to flow into the stroke simulator. When the brake operator of the other brake system is operated from this state, the brake fluid pressure from the master cylinder of the brake system flows into the stroke simulator through the simulator switching valve, and the reaction force of the brake operator is applied to the brake operation. It is given to the child in a pseudo manner. When the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, the valve is closed and the flow of brake fluid to the stroke simulator is shut off. And the stroke simulator side are cut off, and the brake fluid pressure of the master cylinder is applied to the wheel brake. In other words, in the present invention, communication / blocking between the master cylinder side and the stroke simulator can be suitably performed by the simulator switching valve that is operated by the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side. Therefore, unlike the conventional case where these switching operations are performed using a solenoid valve, no extra electrical wiring is required, and the cost can be reduced. In addition, since the electromagnetic valve is not required, it becomes easy to set a layout including other electromagnetic valves and the like, and it is also easy to set a hydraulic pressure path related to communication / blocking. This also increases the degree of freedom in assembling the parts. In particular, in a configuration including two brake systems, the cost can be effectively reduced, and the layout configuration can be simplified effectively.

  According to the vehicle brake hydraulic pressure control device according to the present invention, in the vehicle brake hydraulic pressure control device including the stroke simulator, it is possible to reduce the manufacturing cost and the power consumption.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.
In the drawings to be referred to, FIG. 1 is a brake hydraulic circuit diagram showing a vehicle brake control device according to one embodiment of the present invention, and FIG. 2 is a diagram of a simulator switching valve applied to the vehicle brake control device according to one embodiment. It is an expanded sectional view.

As shown in FIG. 1, the vehicle brake fluid pressure control device (hereinafter referred to as “brake fluid pressure control device”) U of the present embodiment is a bar such as a motorcycle, a motor tricycle, an all-terrain vehicle (ATV), and the like. It is suitably used for a handle type vehicle, and appropriately controls a braking force (brake hydraulic pressure) applied to a front wheel and a rear wheel of a vehicle (not shown). In the following, an example in which the brake fluid pressure control device U is applied to a motorcycle will be described, but the vehicle on which the brake fluid pressure control device U is mounted is not intended to be limited.
As shown in FIG. 1, the brake fluid pressure control device U includes a front wheel brake system FK and a rear wheel brake system RK, and includes a control device 20 for appropriately controlling various components provided in these systems. And appropriately controlling the braking force (brake hydraulic pressure) applied to the wheel brake FB mounted on the front wheel (not shown, the same applies hereinafter) and the wheel brake RB mounted on the rear wheel (not shown, the same applied hereinafter) (not shown). Thus, independent antilock brake control of the wheel brakes FB and RB and interlocking brake control of interlocking the two wheel brakes FB and RB are possible.

The front wheel brake system FK is for braking the front wheel, and includes a hydraulic pressure adjusting device 10F for adjusting the brake hydraulic pressure of the wheel brake FB and a simulator device 10S in the system from the master cylinder FMC to the wheel brake FB. Configured.
The rear wheel brake system RK is for braking the rear wheel, and a hydraulic pressure adjusting device 10R for adjusting the brake hydraulic pressure of the wheel brake RB to the system from the master cylinder RMC to the wheel brake RB, a simulator A device 10S is provided.

  The master cylinders FMC and RMC have a cylinder (not shown) to which a brake fluid tank chamber for storing brake fluid is connected. The cylinders are operated by operating the brake lever L1 and the brake pedal L2 as brake operators. A rod piston (not shown) that slides in the axial direction of the cylinder and flows out the brake fluid is assembled.

  As described above, the brake fluid pressure control device U is constituted by the front wheel brake system FK and the rear wheel brake system RK. Since each brake system has the same configuration, the following mainly describes the front wheel brake system FK. The rear wheel brake system RK will be described as appropriate.

As described above, the brake system FK for the front wheels includes the hydraulic pressure adjusting device 10F and the simulator device 10S.
The hydraulic pressure adjusting device 10F includes a reservoir 2, a pump 3, a regulator 4, and a suction valve 5, and further drives the pumps 3 and 3 of the front wheel brake system FK and the rear wheel brake system RK. A common motor 8 is provided. Further, the hydraulic pressure adjusting device 10F includes control valve means V for controlling the brake hydraulic pressure applied to the wheel brake FB.

The simulator device 10S includes a simulator switching valve 30, a stroke simulator 40, and a bleeder 45, and is provided between the master cylinder FMC, the wheel brake FB, and the hydraulic pressure adjusting device 10F.
Hereinafter, a flow path (oil passage, piping) that reaches the simulator switching valve 30 of the simulator apparatus 10S through the master cylinder FMC is referred to as “output hydraulic pressure path D1”, and the simulator switching valve 30 enters the inlet of the hydraulic pressure adjusting apparatus 10F. A flow path that reaches the regulator 4 through the port 11 is referred to as an “output hydraulic pressure path D2”. Further, the flow path from the regulator 4 to the wheel brake FB through the outlet port 12 and further through the simulator switching valve 30 is referred to as “wheel hydraulic pressure path E”, and the flow path from the output hydraulic pressure path D2 to the pump 3 is referred to as “suction fluid”. This is referred to as “pressure path J”. Further, the flow path from the pump 3 to the wheel hydraulic pressure path E is referred to as “discharge hydraulic pressure path G”, and the flow path from the wheel hydraulic pressure path E to the reservoir 2 is referred to as “open path H”.

  The control valve means V of the hydraulic pressure adjusting device 10F includes a state in which the wheel hydraulic pressure path E is opened and the open path H is blocked, a state in which the wheel hydraulic pressure path E is blocked and the open path H is opened, and a wheel hydraulic pressure path. It has a function of switching the state of blocking the open path H while blocking E, and includes an inlet valve 6, an outlet valve 7, and a check valve 6a.

  The inlet valve 6 is a normally open electromagnetic valve provided in the wheel hydraulic pressure passage E. The inlet valve 6 is normally open, thereby allowing the brake hydraulic pressure to be transmitted from the master cylinder FMC to the wheel brake FB through the output hydraulic pressure paths D1 and D2. Further, the inlet valve 6 is blocked by the control device 20 when the front wheel is about to be locked (anti-lock brake control), thereby blocking the brake hydraulic pressure transmitted from the master cylinder FMC to the wheel brake FB.

  The outlet valve 7 is a normally closed electromagnetic valve interposed between the wheel hydraulic pressure path E and the open path H. The outlet valve 7 is normally closed, but is released by the control device 20 when the front wheel is about to be locked (anti-lock brake control), so that the brake fluid pressure acting on the wheel brake FB is released. Escape to reservoir 2 through H.

  The check valve 6a is connected to the inlet valve 6 in parallel. This check valve 6a is a valve that only allows the flow of brake fluid from the wheel brake FB side to the regulator 4 side, and when the input from the brake lever L1 is released, the inlet valve 6 is closed. Even at times, the brake fluid is allowed to flow from the wheel brake FB side to the regulator 4 side.

  The reservoir 2 is provided in the open path H and has a function of absorbing brake fluid pressure that is released when the outlet valve 7 is opened. Further, between the reservoir 2 and the suction fluid pressure path J, a check valve 2a that allows only brake fluid to flow from the reservoir 2 side to the pump 3 side is interposed.

  The pump 3 is interposed between the suction hydraulic pressure path J leading to the output hydraulic pressure path D2 and the discharge hydraulic pressure path G leading to the wheel hydraulic pressure path E, and sucks the brake fluid stored in the reservoir 2 And has a function of discharging to the discharge hydraulic pressure path G. The brake fluid pressure is transmitted to the wheel fluid pressure passage E by such an operation of the pump 3. Further, during the anti-lock brake control described later, the pressure states of the output hydraulic pressure passage D2 and the wheel hydraulic pressure passage E that have been reduced by absorption of the brake fluid by the reservoir 2 are recovered. After the brake operation by the brake lever L1, the brake valve 4a described later allows the brake fluid to flow from the wheel hydraulic pressure passage E to the output hydraulic pressure passage D2, so that the brake that has flowed into the wheel hydraulic pressure passage E. The liquid is returned to the master cylinder FMC through the output hydraulic pressure path D2. The pump 3 is also driven during the interlocking brake control. As will be described later, the pump 3 sucks the brake fluid on the master cylinder FMC side and discharges it to the discharge hydraulic pressure path G, whereby the brake fluid is applied to the wheel brake FB. Apply pressure.

  Since the pump 3 includes a one-way valve that allows only the brake fluid to flow from the suction port side to the discharge port side, the brake fluid pressure on the discharge port side becomes higher than the brake fluid pressure on the suction side. However, the brake fluid does not flow backward. Further, a damper and an orifice (not shown) are provided on the discharge side of the pump 3, and the pulsation of the brake fluid discharged from the pump 3 is attenuated by the cooperative action.

  The regulator 4 has a function of switching between a state where the brake fluid is allowed to flow from the output hydraulic pressure path D2 to the wheel hydraulic pressure path E and a state where the brake fluid is blocked, and a brake fluid flow from the output hydraulic pressure path D2 to the wheel hydraulic pressure path E. It has a function of adjusting the brake fluid pressure in the wheel fluid pressure passage E and the discharge fluid pressure passage G to a set value or less when the inflow is cut off, and the cut valve 4a, the check valve 4b and the relief valve 4c are provided. It is prepared for.

  The cut valve 4a is a normally-open electromagnetic valve interposed between the output hydraulic pressure path D2 leading to the master cylinder FMC and the wheel hydraulic pressure path E leading to the wheel brake FB. The state where the inflow of the brake fluid into the hydraulic pressure path E is allowed and the state where the brake fluid is shut off are switched. The cut valve 4a is controlled by the control device 20 so as to be shut off (closed) when the pump 3 is operated, and the brake hydraulic pressure from the master cylinder FMC is supplied from the output hydraulic pressure path D2. The direct transmission to the wheel hydraulic pressure path E is cut off. As a result, the brake fluid is sucked into the pump 3 from the output fluid pressure passage D2 through the suction fluid pressure passage J (suction valve 5) as described later. Further, the cut valve 4a is demagnetized as the pump 3 is stopped, and is communicated (opened). As a result, the brake fluid is returned from the wheel hydraulic pressure passage E to the output hydraulic pressure passage D2 through the cut valve 4a.

  The check valve 4b is connected in parallel to the cut valve 4a. The check valve 4b is a valve that allows only the brake fluid to flow from the output hydraulic pressure path D2 to the wheel hydraulic pressure path E, and the output hydraulic pressure path D2 is operated by operating the brake lever L1 during rear wheel interlocking braking described later. The brake fluid discharged to the wheel flows into the wheel hydraulic pressure passage E. Further, even if the cut valve 4a is locked in a closed state due to failure or the like, the brake fluid is allowed to flow from the output hydraulic pressure passage D2 to the wheel hydraulic pressure passage E.

  The relief valve 4c opens when the value obtained by subtracting the brake hydraulic pressure in the output hydraulic pressure path D2 from the brake hydraulic pressure in the wheel hydraulic pressure path E becomes equal to or higher than the valve opening pressure. In the form, it is added as a function to a normally closed electromagnetic valve that becomes the cut valve 4a. The valve opening pressure of the relief valve 4c (the valve opening pressure of the cut valve 4a) can be increased or decreased by controlling the magnitude of the current value applied to the electromagnetic coil for driving the electromagnetic valve.

  The suction valve 5 is a normally closed electromagnetic valve provided in the suction fluid pressure passage J, and switches between a state in which the suction fluid pressure passage J is opened and a state in which the suction fluid pressure passage J is shut off. The suction valve 5 is opened (opened) by the control device 20 with the operation of the pump 3, and is shut off (closed) with the pump 3 stopped.

  The control device 20 mainly controls the operation of the inlet valve 6 and the outlet valve 7 of the control valve means V and the motor 8 and controls the braking force in the front wheel brake system FK and the rear wheel brake system RK. Anti-lock brake control that eliminates the tendency to lock the front and rear wheels through independent adjustment control. Further, when any one of the brake lever L1 and the brake pedal L2 is operated, control is performed to apply a braking force to the wheel brake FB or the wheel brake RB in the brake system on the side different from the operated side. Then, for example, when the front wheel is about to be locked by the operation of the brake lever L1, the control device 20 performs anti-lock brake control to adjust and control the braking force in the brake system FK of the front wheel. Control for applying a braking force to the wheel brake RB in the wheel brake system RK is performed. In such a control device 20, the signal of the front wheel speed sensor 21 fixedly arranged facing the side surface of the pulsar gear fixed to the front wheel, the side surface of the pulsar gear fixed to the rear wheel is also faced. The signal of the rear wheel speed sensor 22 for fixed arrangement is inputted, and further the output of the signals of the hydraulic pressure detection sensors 11f and 11r provided in the output hydraulic pressure path D2 and the liquid provided in the wheel hydraulic pressure path E. Outputs of signals from the pressure detection sensors 12f and 12r are inputted, and the operations of the inlet valve 6 and outlet valve 7 and the motor 8 of the control valve means V and V are controlled.

  Here, the hydraulic pressure detection sensors 11f and 11r provided in the output hydraulic pressure path D2 measure the magnitude of the brake hydraulic pressure in the output hydraulic pressure path D2, and the measured brake hydraulic pressure is the master cylinder. It is a physical quantity that correlates with the brake fluid pressure in FMC and RMC. The hydraulic pressure detection sensors 12f and 12r provided in the wheel hydraulic pressure path E measure the magnitude of the brake hydraulic pressure in the wheel hydraulic pressure path E, and the measured brake hydraulic pressure is the wheel brake FB. , RB is a physical quantity correlated with the brake fluid pressure.

Next, a simulator device 10S that is a characteristic configuration of the present invention will be described.
In this example, as shown in FIG. 2, a mounting hole 50 is formed on the side surface of the base body 50 </ b> A constituting the body of the brake fluid pressure control device U (see FIG. 1), and the simulator switching valve 30 is accommodated in this mounting hole 50. Is done.
The mounting hole 50 has a bottomed cylindrical shape that gradually decreases in diameter from the opening side to the back side, and includes an opening 50a, a first hole wall 51 that communicates with the opening 50a, A second hole wall 52 having a diameter somewhat smaller than that of the one hole wall 51, a third hole wall 53 having a diameter smaller than that of the second hole wall 52, and further than the third hole wall 53. A fourth hole wall portion 54 having a small diameter and a fifth hole wall portion 55 having a diameter smaller than that of the fourth hole wall portion 54 are provided. The output hydraulic pressure paths D1 and D2 are formed in the inner side surface of the second hole wall portion 52, and the inner surface of the fourth hole wall portion 54 is connected to a stroke simulator 40 described later on the simulator device 10S. A communication passage 41 that communicates with the inner surface of the fifth hole wall 55 is formed as an opening, and a wheel hydraulic pressure passage E is formed as an opening. As a result, the brake fluid can flow into and out of the simulator switching valve 30 through these hydraulic pressure paths.
The mounting holes 50 are not limited to those formed in the base body 50A, and may be formed in other members.

The simulator switching valve 30 mainly includes a one-way valve 31, a pressing member 36, and a return spring 37 as an urging means.
The one-way valve 31 is a valve that allows the brake fluid to flow from the stroke simulator 40 to the master cylinder FMC side. The one-way valve 31 is provided with a liquid passage 32 a that communicates with the communication passage 41, and a base portion 32 that is caulked and fixed to the third hole wall portion 53, and an opening portion 32 c of the liquid passage 32 a of the base portion 32. Then, the valve body 33 as a one-way valve that seals the opening portion 32c, the retainer 34 that is disposed so as to cover the opening portion 32c of the base portion 32, the through hole 34a is formed, the bottom surface of the retainer 34, and the valve body 33 And a return spring 35 disposed in a compressed state.
As shown in FIG. 2, such a one-way valve 31 communicates and blocks between the output hydraulic pressure paths D <b> 1 and D <b> 2 and the communication path 41 while being caulked and fixed to the third hole wall 53. It has become.

  As shown in FIG. 3, the pressing member 36 has a stepped columnar shape, and as shown in FIG. 2, the pressure difference between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side. Is slidable toward the one-way valve 31 when the valve opening pressure is reached. And the valve body 33 is pressed by the sliding, and the valve body 33 plays the role of separating from the opening part 32c. Further, the one-way valve 31 is pressed by the return force of the return spring 37 when the pressure difference between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side becomes the valve closing pressure. It is returned to the side away from (the fifth hole wall 55 side), and the valve body 33 is seated on the opening 32c.

Specifically, the pressing member 36 includes a body part 36c disposed inside the fourth hole wall part 54, one end part 36a provided at one end of the body part 36c and inserted through the fifth hole wall part 55, It is provided with the other end part 36d provided in the other end of the trunk | drum 36c, and was penetrated by the liquid path 32a of the one-way valve 31.
The body portion 36c is provided with a flange portion 36b against which one end of the return spring 37 abuts, and a groove portion that allows the brake fluid to flow in a portion facing the side wall of the base portion 32 of the one-way valve 31. 36e is formed. Even when the pressing member 36 slides toward the valve body 33 of the one-way valve 31 and the body portion 36c contacts the base portion 32 of the one-way valve 31, the opening at both ends is liquid. It faces the path 32a and the communication path 41, thereby ensuring the flow of brake fluid.

The one end portion 36a is slidably inserted into the fifth hole wall portion 55 via the O-ring 55a, and the brake fluid pressure of the wheel hydraulic pressure passage E flowing into the brake fluid inflow chamber T2 is inserted into the end surface. Has come to work.
The other end portion 36d is inserted between the fluid passage 32a of the one-way valve 31 with a gap that allows the brake fluid to flow, and the valve element 33 at the tip portion of the other end portion 36d when sliding toward the one-way valve 31 side. Is to be pressed.

  Here, the sliding pressure (valve opening pressure) of the pressing member 36 has a difference between the pressure receiving area of the end surface of the one end 36 a of the pressing member 36 and the area of the opening 32 c of the one-way valve 31. It can be set appropriately.

  The return spring 37 is disposed in a compressed state between the base portion 32 of the one-way valve 31 and the flange portion 36b of the pressing member 36, and extends in the depth direction of the mounting hole 50 (the direction in which the valve body 33 is seated on the opening portion 32c). The pressing member 36 is urged toward it. Thus, in a state where no brake hydraulic pressure is applied to the wheel brake FB, the flange portion 36b of the pressing member 36 is in contact with the side wall in the fourth hole wall portion 54, and the other end portion 36d of the pressing member 36 is The one-way valve 31 is held away from the valve body 33, and the valve body 33 is seated in the opening 32c. Therefore, the one-way valve 31 blocks the output hydraulic pressure paths D1 and D2 and the stroke simulator 40.

  The return force of the return spring 37 is set to be larger than the sliding resistance generated between the one end portion 36 a of the pressing member 36 and the fifth hole wall portion 55. In the present embodiment, the differential pressure between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side, that is, the valve closing pressure is set to zero. Therefore, when the valve closing pressure is reached, the pressing force of the return spring 37 causes the pressing member 36 to slide to the side away from the valve body 33 of the one-way valve 31 (the fifth hole wall 55 side).

The lid member 38 has a bottomed cylindrical shape, and an O-ring 38c is attached to a recess 38a formed on the outer peripheral wall, and is inserted in a state of being in close contact with the first hole wall portion 51 of the attachment hole 50. It is fixed by a ring-shaped retaining member 39 from the side of the portion 50a.
Such a lid member 38 forms a brake fluid inflow chamber T1 around the one-way valve 31 in a state of being fixed to the mounting hole 50.

  As shown in FIG. 1, the stroke simulator 40 artificially applies an operation reaction force of the brake lever L <b> 1 to the brake lever L <b> 1, and is connected to the simulator switching valve 30 via the communication path 41.

  The stroke simulator 40 includes a cylinder 42, a piston 43 that is slidably inserted into the cylinder 42, and a spring 44 that biases the piston 43. The stroke simulator 40 is caused by the operation of the brake lever L1. The brake fluid discharged from the cylinder FMC is accommodated in the cylinder 42 via the simulator switching valve 30 and the communication passage 41, and an operation reaction force of the brake lever L1 is generated by the return force of the spring 44 applied to the piston 43. It has become.

  The bleeder 45 is for removing air mixed in the fluid passage when the brake fluid is sealed, and is provided in the communication passage 41.

By the way, as described above, the simulator switching valve 30 is interposed between the master cylinder FMC side and the stroke simulator 40, and the one-way valve 31 provided on the simulator switching valve 30 is connected to the master cylinder FMC side from the stroke simulator 40. Since the valve body 33 is seated in the opening 32c, that is, the brake fluid pressure is not applied to the wheel brake FB, the pressing member 36 is on the valve body 33 side. When the brake lever L1 is operated, the brake fluid does not flow from the master cylinder FMC side to the stroke simulator 40.
On the other hand, in the state where the brake fluid pressure is applied to the wheel brake FB by the pressure increase of the pump 3, as shown in FIG. 4, the pressing member 36 slides toward the one-way valve 31 and the other end 36d is the valve body. 33 is pressed, and the valve body 33 is separated from the opening 32c. Therefore, when the brake lever L1 is operated from this state, the brake fluid discharged from the master cylinder FMC passes through the simulator switching valve 30 to the stroke simulator 40. Will flow into.

  Here, the pressing member 36 is returned by the return force of the return spring 37 when the differential pressure between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side becomes the valve closing pressure. Therefore, the brake fluid flows into the stroke simulator 40 only when the brake fluid pressure on the master cylinder FMC side is lower than the brake fluid pressure on the wheel brake FB side.

  As shown in FIG. 1, the return force of the spring 44 provided in the stroke simulator 40 is greater than the return force of the return spring 35 provided in the one-way valve 31 of the simulator switching valve 30 as shown in FIG. Is also set larger. Therefore, even if brake fluid remains in the cylinder 42 of the stroke simulator 40, the brake fluid is discharged into the simulator switching valve 30 from the communication passage 41 by the return force of the spring 44 of the stroke simulator 40, and further After flowing from the path 32a into the brake fluid inflow chamber T1 through the opening 32c, it is returned to the master cylinder FMC through the output hydraulic pressure path D1.

  Next, the interlocking brake control and the antilock brake control will be described with reference to the hydraulic circuit in FIGS.

  In the interlocking brake control, the brake fluid pressure is applied to the wheel brake FB corresponding to the front wheel brake system FK in conjunction with the operation of the brake pedal L2 corresponding to the rear wheel brake system RK (hereinafter referred to as “rear interlocking brake”). Control)) and control for applying brake fluid pressure to the wheel brake FB corresponding to the rear brake system RK in conjunction with the operation of the brake lever L1 corresponding to the front brake system FK (hereinafter referred to as “front interlock”). "Brake control"). The rear interlocking brake control and the front interlocking brake control are the same in basic operation except for the brake system to be controlled. Therefore, the following description will be given on the rear interlocking brake control. The description about is omitted.

  When the driver operates the brake pedal L2 to brake the rear wheel, the brake fluid is discharged from the master cylinder RMC to the output hydraulic pressure path D1 in the rear wheel brake system RK as shown in FIG. Brake fluid flows into the simulator switching valve 30 of the simulator device 10S from the road D1. At this stage, since the brake fluid does not act on the wheel brake RB, the pressing member 36 does not slide toward the one-way valve 31 as shown in FIG. 2, and the valve element 33 is seated on the opening 32c. is doing. Therefore, the brake fluid that has flowed into the brake fluid inflow chamber T1 of the simulator switching valve 30 through the output hydraulic pressure passage D1 flows out to the output hydraulic pressure passage D2 as it is, and reaches the regulator 4 of the hydraulic pressure adjusting device 10R through the inlet port 11. Then, the brake fluid flows into the wheel hydraulic pressure passage E through the inlet valve 6 of the control valve means V, and flows into the brake fluid inflow chamber T2 of the simulator switching valve 30 through the outlet port 12. At this time, since no differential pressure is generated between the brake fluid inflow chamber T1 and the brake fluid inflow chamber T2, the pressing member 36 does not slide, and the brake fluid is transferred from the brake fluid inflow chamber T2 to the wheel. It acts on the wheel brake RB through the hydraulic path E. As a result, a braking force corresponding to the operation of the brake pedal L2 is applied to the wheel brake RB.

On the other hand, as shown in FIG. 5, the measured value of the brake hydraulic pressure from the master cylinder RMC is acquired by the hydraulic pressure detection sensor 11r provided in the output hydraulic pressure path D2, and is also provided in the wheel hydraulic pressure path E. Measurement values of the brake hydraulic pressure applied to the wheel brake RB are acquired by the hydraulic pressure detection sensor 12r, and these physical quantities are taken into the control device 20.
Here, the control device 20 determines whether or not it is necessary to apply brake hydraulic pressure to the wheel brake FB corresponding to the brake system FK of the front wheels in conjunction with the operation of the brake pedal L2 (that is, the rear interlocking brake control is executed). For example, it is determined whether or not the measured value of the brake fluid pressure from the master cylinder RMC has reached a predetermined threshold value, and it is determined that the braking force needs to be applied to the front wheels. In such a case, the motor 8 is driven to perform interlocking brake control. In this case, the control device 20 sets the target pressure value of the hydraulic pressure detection sensor 12f provided in the front wheel brake system FK based on the measurement value of the hydraulic pressure detection sensor 12r provided in the rear wheel brake system RK. Then, control for closing the cut valve 4a of the brake system FK for the front wheels and control for opening the intake valve 5 are performed. This state is continued until the measurement value measured by the hydraulic pressure detection sensor 12f of the brake system FK for the front wheels reaches the target pressure value, and the brake hydraulic pressure is automatically applied to the wheel brake FB.

  When the motor 8 is driven, the pump 3 of the brake system FK for the front wheels is operated, and the brake fluid (master cylinder FMC, output hydraulic pressure path D1) stored on the master cylinder FMC side as shown by a thick one-dotted line in FIG. , D2 and the brake fluid stored in the suction fluid pressure passage J) are discharged to the discharge fluid pressure passage G through the pump 3 and supplied to the wheel fluid pressure passage E through the inlet valve 6 of the control valve means V. The brake fluid acts on the wheel brake FB via the simulator switching valve 30 of the simulator device 10S. As a result, the brake fluid pressure acting on the wheel brake FB is increased, and the rear interlocking brake control is performed.

  At this time, the brake fluid that has flowed into the simulator switching valve 30 through the wheel hydraulic pressure passage E acts on one end portion 36a of the pressing member 36 in the brake fluid inflow chamber T2, as shown in FIG. The pressing member 36 slides toward the one-way valve 31 side. As a result, the valve element 33 of the one-way valve 31 is separated from the opening 32c. That is, as shown in FIG. 5, the master cylinder FMC side and the stroke simulator 40 are communicated with each other through the one-way valve 31 so as to allow the brake fluid to flow and stand by.

  From this state, when the brake lever L1 on the front wheel side is operated and additional brake fluid pressure is discharged from the master cylinder FMC, the discharged brake fluid is discharged from the simulator switching valve of the simulator device 10S through the output fluid pressure path D1. 30. Here, as described above, since the valve element 33 of the one-way valve 31 is separated from the opening 32c, the brake fluid flowing into the simulator switching valve 30 flows into the brake fluid inflow chamber as shown in FIG. From T1, it flows into the communication passage 41 through the one-way valve 31 (see FIG. 4) and flows into the stroke simulator 40. Thereby, an operation reaction force of the brake lever L1 is artificially applied to the brake lever L1.

  Thereafter, when the brake fluid pressure on the master cylinder FMC side becomes equal to or higher than the brake fluid pressure on the wheel brake FB side (when the valve closing pressure is reached), the pressing member 36 is reduced by the return force of the return spring 37 as shown in FIG. It is returned to the side away from the directional valve 31 (the fifth hole wall 55 side). As a result, the valve element 33 is seated in the opening 32c, the one-way valve 31 is closed, and the master cylinder FMC side and the stroke simulator 40 are shut off. As a result, as shown in FIG. 7, the brake fluid pressure on the master cylinder FMC side is discharged from the output fluid pressure passage D1 to the output fluid pressure passage D2 via the brake fluid inflow chamber T1.

The brake fluid discharged to the output hydraulic pressure path D2 flows into the hydraulic pressure adjusting device 10F, reaches the regulator 4, flows into the control valve means V through the check valve 4b, and passes through the inlet valve 6 to the wheel hydraulic pressure path E. Flow into.
Thereafter, the brake fluid flows into the brake fluid inflow chamber T <b> 2 of the simulator switching valve 30 through the outlet port 12. At this time, the brake fluid pressure from the master cylinder FMC is also acting on the brake fluid inflow chamber T1, and no pressure difference is generated between the brake fluid inflow chamber T1 and the brake fluid inflow chamber T2. The member 36 does not slide, and the brake fluid acts on the wheel brake FB from the brake fluid inflow chamber T2 through the wheel fluid pressure path E. As a result, a braking force corresponding to the operation of the brake lever L1 is applied to the wheel brake FB.

Next, the relationship between the stroke of the brake lever L1 and the load when there is an additional input from the front wheel brake lever L1 as described above in such interlocking brake control will be described. First, in the brake fluid pressure control device that does not have the simulator device 10S of the present embodiment, as shown in FIG. 8A, compared with the case of normal operation of the brake lever L1 (the diagram shown by the solid line in the figure). During the interlock operation of the brake lever L1, the load W2 larger than the load W1 during the normal operation of the brake lever L1 is applied from the time of the initial stroke N1, the operational feeling of the brake lever L1 becomes hard, and the brake lever L1 Good operation feeling cannot be obtained.
On the other hand, in the present embodiment, when the brake fluid flows into the stroke simulator 40, the initial stroke of the brake lever L1 is reproduced as shown in FIG. A pseudo reaction force is applied to the brake lever L1 so as to correspond to the diagram. As a result, a good operation feeling of the brake lever L1 can be obtained.

  The control device 20 stops driving the motor 8 and stops the pump 3 when the measured value of the brake fluid pressure on the master cylinder FMC side acquired by the fluid pressure detection sensor 11f exceeds a predetermined value. To control. As a result, the pulsation due to the operation of the pump 3 is not easily transmitted to the master cylinder FMC side, and a good operation feeling of the brake lever L1 can be obtained.

  The anti-lock brake control is executed when the wheel is about to fall into a locked state, and controls the control valve means V corresponding to the wheel brakes FB and RB of the wheel that is about to fall into the locked state. This is realized by appropriately selecting a state in which the brake fluid pressure acting on the wheel brakes FB and RB is reduced, increased or kept constant. Whether to select pressure reduction, pressure increase, or holding is determined by the control device 20 based on a wheel speed obtained from a wheel speed sensor (not shown). During antilock brake control, the cut valve 4a is opened and the intake valve 5 is closed.

  Hereinafter, the outline of the anti-lock brake control will be described. As described above, since the configurations of the front-wheel brake system FK and the rear-wheel brake system RK are the same, the anti-lock brake control is performed for the front-wheel brake system FK. The case of executing is exemplified.

  When the brake fluid pressure acting on the wheel brake FB is reduced by the anti-lock brake control, the inlet valve 6 in the front wheel brake system FK is closed and the outlet valve 7 is opened. In this way, the brake fluid in the wheel fluid pressure passage E flows into the reservoir 2 through the release passage H, and as a result, the brake fluid pressure acting on the wheel brake FB is reduced. When the anti-lock brake control is executed, the pump 3 (directly the motor 8) is driven to return the brake fluid stored in the reservoir 2 to the wheel hydraulic pressure path E.

  When the brake fluid pressure acting on the wheel brake FB is held by the antilock brake control, the inlet valve 6 and the outlet valve 7 in the brake system FK for the front wheels are closed. If it does in this way, brake fluid will be confine | sealed in the flow path closed by the wheel brake FB, the inlet valve 6, and the outlet valve 7, As a result, the brake fluid pressure which is acting on the wheel brake FB becomes constant. Will be retained.

  When the brake fluid pressure acting on the wheel brake FB is increased by the antilock brake control, the inlet valve 6 is opened and the outlet valve 7 is closed. In this case, the brake fluid pressure generated in the master cylinder FMC is applied to the wheel brake FB via the output fluid pressure paths D1 and D2 and the wheel fluid pressure path E, and thus acts on the wheel brake FB. The brake fluid pressure will increase.

  In a state where the antilock brake control and the interlock brake control are not executed (normally set state), the electromagnetic coil that drives each valve is demagnetized, the cut valve 4a and the inlet valve 6 are opened, and the outlet valve 7 and the intake valve 5 are closed. In this state, when the driver operates the brake lever L1 and the brake pedal L2, the brake hydraulic pressure generated in the master cylinders FMC and RMC is directly transmitted through the output hydraulic pressure paths D1 and D2 and the wheel hydraulic pressure path E. This is applied to the wheel brakes FB and RB.

According to the brake fluid pressure control device U of the present embodiment described above, for example, when the pump 3 is operated by the rear interlocking brake control, the increased brake fluid pressure acts on the front wheel brake FB, and the brake When the hydraulic pressure also flows into the simulator switching valve 30 and reaches the valve opening pressure, the one-way valve 31 is pressed by the pressing member 36 to open (the valve element 33 is separated), and the master cylinder FMC side and the stroke simulator are opened. 40 is communicated. When the brake lever L1 is operated from this state, the brake hydraulic pressure from the master cylinder FMC flows into the stroke simulator 40 through the simulator switching valve 30, and the operation reaction force of the brake lever L1 is simulated with respect to the brake lever L1. To be granted.
When the differential pressure between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side becomes the valve closing pressure, the one-way valve 31 of the simulator switching valve 30 is closed (the valve element 33 is seated). Thus, the master cylinder FMC side and the stroke simulator 40 are disconnected, and the brake fluid pressure on the master cylinder FMC side flows into the wheel brake FB side. That is, in this embodiment, the communication / blocking between the master cylinder FMC side and the stroke simulator 40 is preferably performed by the simulator switching valve 30 that is operated by the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side. It can be carried out. Therefore, unlike the prior art, an electromagnetic valve for performing communication / blocking of these is not necessary, and no electrical wiring is required for that purpose, so that cost can be reduced and power consumption can be reduced. In addition, it becomes easy to set a layout including other solenoid valves and the like, and it becomes easy to set a hydraulic pressure path related to communication / blocking, and the degree of freedom in assembling components is increased. This also contributes to the compactness of the base body 50A provided with a solenoid valve or the like.

  Moreover, the simulator switching valve 30 is closed (the valve element 33 is seated) when, for example, the differential pressure between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side becomes the valve closing pressure. Thus, the master cylinder FMC side and the stroke simulator 40 are disconnected from each other, and the brake fluid pressure on the master cylinder FMC side flows into the wheel brake FB. The transition when the switching is performed so that the brake fluid pressure acts on the FB side is smoothly performed, and the operation feeling of the brake lever L1 is improved.

  Further, the simulator switching valve 30 can be simply configured with a small number of parts by mainly mounting the one-way valve 31, the pressing member 36, the return spring 37, and the lid member 38 in the mounting hole 50. In addition, communication / blocking between the master cylinder FMC side and the stroke simulator 40 can be suitably performed without using a solenoid valve.

  In addition, the pressing member 36 has a differential pressure between the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side, for example, when an additional operation is performed by the brake lever L1 during rear interlocking brake control. When the valve closing pressure is reached, the return spring 37 moves the valve element 33 of the one-way valve 31 in the direction in which the valve element 33 is seated in the opening 32c, so that the brake fluid on the master cylinder FMC side from the initial stroke of the brake lever L1. The brake fluid flows into the stroke simulator 40 until the pressure reaches the brake fluid pressure on the wheel brake FB side, and after reaching the brake fluid pressure, the brake fluid flows into the wheel brake FB side. Accordingly, the inflow brake fluid is smoothly switched from the stroke simulator 40 to the wheel brake FB side, and the operation reaction force applied to the brake lever L1 reflects the brake fluid pressure by the interlock brake control. Feeling is good.

The simulator switching valve 30 mechanically slides the pressing member 36 using the brake fluid pressure on the master cylinder FMC side and the brake fluid pressure on the wheel brake FB side, for example, on the master cylinder FMC side. And the stroke simulator 40 are communicated and disconnected, so that electrical control unlike the conventional solenoid valve is not required, and the brake control with a simple configuration and high reliability can be performed.
Further, since the brake fluid pressure increased by the pump 3 is used for sliding (moving) of the pressing member 36, a separate member for increasing the pressure of the brake fluid is not required, which is economical.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented.
For example, in the above-described embodiment, an example in which the wheel hydraulic pressure path E is formed on the back side of the mounting hole 50 and the output hydraulic pressure paths D1 and D2 are formed on the inlet side is shown, but the present invention is not limited thereto. As shown in FIG. 9, the simulator switching valve 30 ′ (see FIG. 10) is formed by forming the wheel hydraulic pressure passage E on the inlet side of the mounting hole 60 and forming the output hydraulic pressure passages D <b> 1 and D <b> 2 on the rear side. May be configured. In addition, the same code | symbol is used for the same element as the said simulator switching valve 30, and the overlapping description is abbreviate | omitted.

  The mounting hole 60 is formed on a different side surface of the base body 50A constituting the body of the brake fluid pressure control device U (see FIG. 1), and has a bottomed cylinder that gradually reduces in diameter stepwise from the opening side to the back side. It has a shape. The mounting hole 60 includes an opening 60a, a first hole wall 61 communicating with the opening 60a, a second hole wall 62 having a smaller diameter than the first hole wall 61, and the second hole wall. A third hole wall 63 having a diameter smaller than 62 and a fourth hole wall 64 having a diameter somewhat smaller than that of the third hole wall 63 are provided. A wheel hydraulic pressure passage E is formed in the inner side surface of the first hole wall portion 61, and a communication path 41 is formed in the inner side surface of the second hole wall portion 62. Output hydraulic pressure paths D <b> 1 and D <b> 2 are formed in the inner side surface of the fourth hole wall portion 64.

In the one-way valve 31, the peripheral portion 32b of the base portion 32 is caulked and fixed to the third hole wall portion 63, and the retainer 34 is disposed in the fourth hole wall portion 64 to form the brake fluid inflow chamber T1. The pressing member 36 is disposed in the second hole wall 62 with one end 36 a directed toward the opening 60 a and the other end 36 d directed toward the one-way valve 31.
The lid member 38 has a bottomed cylindrical shape with a size extending from the first hole wall portion 61 to the second hole wall portion 62, and includes a large diameter portion 38B and a small diameter portion 38A. The large-diameter portion 38B is inserted in a state in which an O-ring 38c is attached to a recess 38b formed in the outer peripheral wall and is in close contact with the first hole wall portion 61, and the ring-shaped retaining member 39 is inserted from the opening 60a side. Fixed. The small-diameter portion 38A is inserted in a state in which an O-ring 38c is attached to a recess 38a formed in the outer peripheral wall and is in close contact with the second hole wall portion 62, and one end portion of the pressing member 36 is inserted into the hollow portion 38D. 36a is slidably inserted through an O-ring 38e. In addition, a brake fluid inflow chamber T2 is formed in the hollow portion 38D, and a wheel hydraulic pressure path E communicates with the brake fluid inflow chamber T2 through a through hole 381.

  According to such a simulator switching valve 30 ′, the pressing member 36 is slidable to the one-way valve 31 side in response to the brake hydraulic pressure of the wheel hydraulic pressure passage E (the brake hydraulic pressure on the wheel brake side), By the sliding, as shown in FIG. 11, the valve body 33 is pressed and the valve body 33 is separated from the opening 32c. Further, the pressing member 36 has a return spring 37 when the brake hydraulic pressure on the master cylinder FMC side (output hydraulic pressure path D1 side) becomes equal to or higher than the brake hydraulic pressure on the wheel brake FB side (wheel hydraulic pressure path E side). Is returned to the side away from the one-way valve 31 (the first hole wall 61 side). Therefore, when the brake fluid pressure on the master cylinder FMC side becomes equal to or higher than the brake fluid pressure on the wheel brake FB side, the valve element 33 of the one-way valve 31 is seated on the opening 32c (see FIG. 9).

  Therefore, by using such a simulator switching valve 30 ′, the same effect as that of the above embodiment can be obtained, and the manufacturing cost can be reduced in the brake hydraulic pressure control device U including the stroke simulator 40. At the same time, power consumption can be reduced.

The constituent members of the simulator switching valves 30, 30 ′ are not limited to the shapes described above, and any shapes can be adopted.
In the above embodiment, an example in which the brake hydraulic pressure control device U is applied to a bar handle type vehicle (motorcycle) has been described. However, the present invention is not limited to this example. Can be applied.

It is a brake fluid pressure circuit diagram applied to the brake fluid pressure control device for vehicles concerning one embodiment of the present invention. It is sectional drawing which shows a simulator switching valve. It is a disassembled perspective view which shows a simulator switching valve. It is sectional drawing which shows operation | movement of a simulator switching valve. It is explanatory drawing of a brake hydraulic pressure circuit diagram. It is explanatory drawing of a brake hydraulic pressure circuit diagram. It is explanatory drawing of a brake hydraulic pressure circuit diagram. (A) and (b) are the figures which showed the relationship between the stroke of a brake lever corresponding to interlocking brake control, and a load. It is sectional drawing which shows the modification of a simulator switching valve. It is a disassembled perspective view which shows the modification of a simulator switching valve. It is sectional drawing which shows operation | movement of the modification of a simulator switching valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Reservoir 3 Pump 4 Regulator 4a Cut valve 4c Relief valve 5 Suction valve 6 Inlet valve 7 Outlet valve 8 Motor 10F, 10R Hydraulic pressure adjusting device 10S Simulator device 20 Control device 30 Simulator switching valve 30 'Simulator switching valve 31 One-way valve member 32 Base 32a Fluid path 32c Opening 33 Valve body 36 Pressing member 37 Return spring 38 Lid member 40 Stroke simulator 41 Communication path 44 Spring 50 Mounting hole 50A Base FB, RB Wheel brake FK, RK Brake system FMC, RMC Master cylinder L1 Brake Lever (brake operator)
L2 Brake pedal (brake operator)
U Brake fluid pressure control device V Control valve means

Claims (4)

A vehicular brake hydraulic pressure control device including a brake system including a hydraulic pressure path from a master cylinder that generates a brake hydraulic pressure according to a stroke amount of a brake operator to a wheel brake,
The brake system is provided with a regulator having a cut valve that opens and closes the hydraulic pressure path, a suction path that bypasses the regulator, and the suction path, and sucks brake fluid that is closer to the master cylinder than the regulator. A pump that discharges to the wheel brake side of the regulator, and a suction valve that opens and closes the suction path on the suction side of the pump,
Furthermore, a stroke simulator that is provided in the hydraulic pressure path, and in which the brake hydraulic pressure from the master cylinder is flowed in and artificially applies an operation reaction force of the brake operator to the brake operator,
Provided in the hydraulic pressure path between the master cylinder and the stroke simulator, and operated by the brake hydraulic pressure generated in the master cylinder and the brake hydraulic pressure applied to the wheel brake, the master cylinder side And a simulator switching valve for communicating / blocking between the stroke simulator side,
The simulator switching valve is a normally closed valve,
When the differential pressure between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve opening pressure, the valve opens, allowing the brake fluid to flow into the stroke simulator, and When the pressure difference between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes the valve closing pressure, the valve is closed to block the flow of brake fluid into the stroke simulator, and the master cylinder A brake fluid pressure control device for a vehicle, wherein the brake fluid pressure is applied to the wheel brake. The simulator switching valve is
A one-way valve that allows the brake fluid to flow from the stroke simulator side to the master cylinder side;
A pressing member that moves by receiving a brake fluid pressure on the wheel brake side and presses and separates the valve body of the one-way valve;
Biasing means for biasing the pressing member in a direction in which the one-way valve is seated;
The vehicular brake hydraulic pressure control device according to claim 1, comprising:   The pressing member moves in a direction in which the one-way valve is seated by the biasing means when a differential pressure between the brake fluid pressure on the master cylinder side and the brake fluid pressure on the wheel brake side becomes a valve closing pressure. The vehicular brake hydraulic pressure control device according to claim 2, wherein Two brake systems,
When brake fluid pressure is applied to the wheel brake corresponding to one of the brake systems, the pump corresponding to the other brake system is operated, and the brake fluid is also applied to the wheel brake corresponding to the brake system. The brake hydraulic pressure control device for a vehicle according to any one of claims 1 to 3, wherein pressure is applied.

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