JP3901352B2 - Brake fluid pressure control device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake fluid pressure control device for a vehicle, and in particular, a reservoir for storing brake fluid, a plurality of normally open solenoid valves respectively provided between a plurality of wheel brakes and a master cylinder, each wheel brake and the reservoir. A plurality of normally closed solenoid valves respectively provided between them, a pump that pumps up the brake fluid in the reservoir and supplies the brake fluid to at least some of the wheel brakes, and an electric that drives the pump The present invention relates to a brake fluid pressure control device for a vehicle that is attached to a common base.
[0002]
[Prior art]
Conventionally, such a brake fluid pressure control device is already known, for example, from Japanese Patent Laid-Open Nos. 6-122364 and 9-254760.
[0003]
[Problems to be solved by the invention]
In the above-described conventional one, the pump is a plunger pump that reciprocates in the axial direction, the electric actuator is an electric motor, and a plurality of normally open solenoid valves, a plurality of normally closed solenoid valves, and a reservoir are provided on the base. Whereas the electric motor is mounted on the other surface side of the base, the brake hydraulic pressure control device is increased in size. Further, the plunger pump is attached to the base body from the side surfaces orthogonal to both surfaces of the base body so as to operate the plunger in the direction orthogonal to the rotation axis of the electric motor, and the base body itself becomes large. In addition, since the plurality of normally open solenoid valves, the plurality of normally closed solenoid valves and the reservoir, the electric motor, and the plunger pump are attached to the base body from different directions, the assembly is only complicated. In addition, since the substrate has to be processed from multiple directions, the processing of the substrate becomes complicated. Furthermore, in order to perform electrical connection to the electric motor and each normally open solenoid valve and each normally closed solenoid valve at the same location, Japanese Patent Laid-Open No. 6-122364 discloses each normally open solenoid valve and each A through hole for routing a conductor connected to the electric motor attached to the other surface side of the base is provided on one side of the base on which the normally closed solenoid valve is disposed. In such a structure, Not only is the processing of the substrate more complicated, but the substrate itself is also increased in size and inferior to the substrate.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and is intended to simplify the processing applied to the base body to reduce the number of processing steps and improve the assemblability, thereby reducing the size of the entire apparatus. An object of the present invention is to provide a brake fluid pressure control device.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a reservoir for storing brake fluid, a plurality of normally open solenoid valves respectively provided in a hydraulic circuit between a plurality of wheel brakes and a master cylinder, each wheel brake, A plurality of normally closed solenoid valves respectively provided in a hydraulic circuit between the reservoirs, a pump capable of pumping up brake fluid in the reservoir and supplying brake fluid to at least some of the wheel brakes; In a brake hydraulic pressure control device for a vehicle in which an electric actuator for driving a pump is attached to a common base, a plunger type in which a plunger facing one end in a pump chamber is slidably fitted in a pump housing Of the pumpTo drive the pump coaxially connected to the pump.Reciprocating actuatorAnd the hydraulic pressure generation unit is configured.Hydraulic pressure generation unit,The reservoir, the normally open solenoid valves, and the normally closed solenoid valvesBut, The substrateContinuous side ofFrom the same directionAnd in parallel with each otherAttached and its baseThe continuous surface ofFurther, a cover to which the board on which the electronic control unit is mounted is fixed is fastened, and the reservoir, the normally open solenoid valves, the normally closed solenoid valves, and the hydraulic pressure generating unit are the same by the cover. A terminal that is covered from the direction and extends from the normally open solenoid valve, the normally closed solenoid valve, and the hydraulic pressure generating unit is connected to the substrate.
[0006]
  According to such a configuration,Includes an actuator and a plunger pump coaxially connected to the actuatorHydraulic pressure generation unitWhen,ReservoirWhen,Each normally open solenoid valveWhen,Each normally closed solenoid valveWhenIs the baseContinuous side ofFrom the same directionAnd in parallel with each otherSince it is mounted, the processing for mounting the hydraulic pressure generating unit, reservoir, each normally open solenoid valve and each normally closed solenoid valve isThe continuous surfaceIt is not necessary to process the base or route the conductor to make electrical connection to the actuator, each normally open solenoid valve, and each normally closed solenoid valve at the same location. . Therefore, it is possible to simplify the processing of the substrate to reduce the number of processing steps and improve the assembling property, and to reduce the size of the substrate and the entire apparatus. Also substrateThe continuous surface ofIs covered with a cover to which the board on which the electronic control unit is mounted is fastened. The cover covers the reservoir, each normally open solenoid valve, each normally closed solenoid valve, and the hydraulic pressure generating unit from the same direction. In addition, terminals extending from the normally open solenoid valve, the normally closed solenoid valve, and the hydraulic pressure generating unit are connected to the substrate.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0008]
FIGS. 1 to 8 show an embodiment of the present invention. FIG. 1 is a hydraulic circuit diagram of a brake hydraulic pressure control device for a vehicle, and FIG. 2 corresponds to FIG. 1 showing a reduced pressure state in ABS control. FIG. 3 is a hydraulic circuit diagram corresponding to FIG. 1 showing the hydraulic pressure holding state in the ABS control, FIG. 4 is a hydraulic circuit diagram corresponding to FIG. 1 showing the pressure increasing state in the ABS control, 5 is a hydraulic circuit diagram corresponding to FIG. 1 showing the traction control state, FIG. 6 is a longitudinal side view of the vehicle brake hydraulic pressure control device, and FIG. 7 is a base body as seen from the direction of arrows 7-7 in FIG. FIG. 8 is an enlarged sectional view taken along line 8-8 of FIG.
[0009]
First, in FIG. 1, this brake fluid pressure control device is mounted on a front-wheel drive four-wheel vehicle, and includes a master cylinder M that is configured in a tandem type with a reservoir R, a left front wheel that is a drive wheel, and Wheel brake B for left and right front wheels mounted on the right front wheel, respectively_FL, B_FRAnd wheel brakes B for the left and right rear wheels mounted on the left rear wheel and the right rear wheel, which are driven wheels, respectively._RL, B_RRProportional pressure reducing valve 1 connected to each_L, 1_RBetween.
[0010]
The master cylinder M includes a pair of output ports 4A and 4B that output brake fluid pressure according to the depression of the brake pedal 3, and the first and second output fluid pressure paths 5A and 5B are individually provided in both the output ports 4A and 4B. Connected to. Thus, the first output hydraulic pressure path 5A is a wheel brake B for the left front wheel and the right rear wheel that is individually attached to the left front wheel and the right rear wheel, which are a pair of front and rear._FL, B_RRThe second output hydraulic pressure path 5B is a wheel brake B for the right front wheel and the left rear wheel that is individually attached to the right front wheel and the left rear wheel, which are a set of front and rear._FR, B_RLIt corresponds to.
[0011]
The first output hydraulic pressure path 5A is connected to a first reservoir 7A that stores brake fluid via a first check valve 10A that allows the brake fluid to flow to the first output hydraulic pressure path 5A side. The second output hydraulic pressure path 5B is connected to a second reservoir 7B that stores brake fluid via a second check valve 10B that allows the brake fluid to flow to the second output hydraulic pressure path 5B.
[0012]
First output hydraulic pressure path 5A and first reservoir 7A and wheel brake B for the left front wheel_FLControl valve means 6 between_FLAnd the first output hydraulic pressure path 5A and the first reservoir 7A and the wheel brake B for the right rear wheel._RRControl valve means 6 between_RRIs provided. Also, the second output hydraulic pressure path 5B, the second reservoir 7B, and the wheel brake B for the right front wheel_FRControl valve means 6 between_FRAnd the second output hydraulic pressure path 5B, the second reservoir 7B, and the wheel brake B for the left rear wheel._RLControl valve means 6 between_RLIs provided.
[0013]
The discharge port 30 (see FIG. 8) of the first pump 8A, to which the suction port 32 (see FIG. 8) is connected to the first reservoir 7A, is the wheel brake B for the left front wheel._FLAnd control valve means 6_FLIn between, wheel brake B for the left front wheel_FLThe discharge port of the second pump 8B connected to the second reservoir 7B is connected to the second reservoir 7B by blocking the flow of brake fluid from the side to the first pump 8A side._FRAnd control valve means 6_FRIn between, wheel brake B for the right front wheel_FRThe brake fluid is prevented from flowing from the side to the second pump 8B side and is connected.
[0014]
The first hydraulic pressure generating unit 14A is composed of the first pump 8A and the electric first actuator 9A that drives the first pump 8A, and the electric first actuator that drives the second pump 8B and the second pump 8B. The second hydraulic pressure generation unit 14B is constituted by the two actuators 9B, and both the hydraulic pressure generation units 14A and 14B can operate independently of each other.
[0015]
Wheel brake B for left front wheel_FLControl valve means 6 corresponding to_FLIs the first output hydraulic pressure path 5A and the left front wheel brake B._FLNormally-open solenoid valve 11 provided in between_FLAnd wheel brake B for the left front wheel_FLAnd a normally closed solenoid valve 13 provided between the first reservoir 7A_FLIt consists of.
[0016]
This control valve means 6_FLIs a normally open solenoid valve 11_FLIs demagnetized, opened and normally closed solenoid valve 13_FLIs demagnetized and closed to master cylinder M and front left wheel brake B_FLWheel brake B_FLAnd the state where the first reservoir 7A is shut off, and the normally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLExciting and opening the valve, the master cylinder M and the wheel brake B for the left front wheel_FLWheel brake B for left front wheel_FLThe first reservoir 7A and the normally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLDemagnetize and close the master cylinder M and the first reservoir 7A and the wheel brake B for the left front wheel._FLAre controlled so as to switch between the two states.
[0017]
Wheel brake B for right front wheel_FRControl valve means 6 corresponding to_FRIs the second output hydraulic path 5B and the wheel brake B for the right front wheel._FRNormally-open solenoid valve 11 provided in between_FRAnd wheel brake B for the right front wheel_FRAnd a normally closed solenoid valve 13 provided between the second reservoir 7B_FRThe wheel brake B for the master cylinder M and the right front wheel_FRWheel brake B for right front wheel_FRAnd the state where the second reservoir 7B is disconnected, and the wheel brake B for the master cylinder M and the right front wheel_FRWheel brake B for right front wheel_FRAnd the state of communication between the reservoir 7B, the master cylinder M and the reservoir 7B, and the wheel brake B for the right front wheel_FRAre controlled so as to switch between the two states.
[0018]
Wheel brake B for the right rear wheel_RRControl valve means 6 corresponding to_RRIs the first output hydraulic path 5A and the right rear wheel brake B_RRNormally-open solenoid valve 11 with a throttle provided between them_RRAnd the normally open solenoid valve 11_RROne-way valve 12 connected in parallel to_RRAnd wheel brake B for the right rear wheel_RRAnd a normally closed solenoid valve 13 provided between the first reservoir 7A_RRAnd a one-way valve 12_RRIs a normally open solenoid valve 11 with a throttle._RRWheel brake B for the right rear wheel when the brake operation is stopped with the valve open_RRTo quickly return the brake fluid to the master cylinder M side.
[0019]
This control valve means 6_RRIs a normally open solenoid valve 11_RRIs demagnetized, opened and normally closed solenoid valve 13_RRIs demagnetized and closed to master cylinder M and wheel brake B for the right rear wheel._RRWheel brake B_RRAnd the state where the first reservoir 7A is shut off, and the normally open solenoid valve 11_RRAnd normally closed solenoid valve 13_RRExciting and opening the valve, the master cylinder M and the wheel brake B for the right rear wheel_RRWheel brake B for the right rear wheel_RRThe first reservoir 7A and the normally open solenoid valve 11_RRAnd normally closed solenoid valve 13_RRDemagnetize and close the master cylinder M and the first reservoir 7A and the wheel brake B for the right rear wheel._RRAnd the normally open solenoid valve 11_RRIs demagnetized, opened and normally closed solenoid valve 13_RRAnd opens the master cylinder M and the first reservoir 7A and the wheel brake B for the right rear wheel._RRAre controlled so as to switch the state of communicating with each other.
[0020]
Furthermore, the wheel brake B for the left rear wheel_RLControl valve means 6 corresponding to_RLIs the second output hydraulic pressure path 5B and the wheel brake B for the left rear wheel._RLNormally-open solenoid valve 11 provided in between_RLAnd the normally open solenoid valve 11_RLOne-way valve 12 connected in parallel to_RLAnd wheel brake B for the left rear wheel_RLAnd a normally closed solenoid valve 13 provided between the second reservoir 7B_RLThe wheel brake B for the master cylinder M and the left rear wheel_RLWheel brake B_RLAnd the state where the second reservoir 7B is disconnected, and the wheel brake B for the master cylinder M and the left rear wheel._RLWheel brake B for left rear wheel_RLAnd the state of communication between the second reservoir 7B, the master cylinder M and the second reservoir 7B, and the wheel brake B for the left rear wheel._RLAnd a state where both the master cylinder M and the second reservoir 7B and the left rear wheel wheel brake B are blocked._RLAre controlled so as to switch the state of communicating with each other.
[0021]
In such a brake fluid pressure control device, each control valve means 6 is operated during normal brake operation by depressing the brake pedal 3._FL~ 6_RRThen, normally open type solenoid valve 11_FL~ 11_RRIs demagnetized and opened, and the normally closed solenoid valve 13_FL~ 13_RRIs demagnetized and closed, and the hydraulic pressure output from the master cylinder M is the wheel brake B for the left front wheel and the right rear wheel._FL, B_FRProportional pressure reducing valve 1_R, 1_LThe wheel brake B for right rear wheel and left rear wheel_RR, B_RLAct on. At this time, both actuators 9A and 9B that drive both pumps 8A and 8B remain stopped.
[0022]
When the wheel is about to enter the locked state during the brake operation described above, each control valve means 6_FL~ 6_RRAmong them, the ABS control is executed by switching the pressure reduction, holding and pressure increase of the brake fluid pressure by the control valve means corresponding to the wheel that is about to enter the locked state. Wheel brake B for the left front wheel when it is about to enter_FLThe ABS control will be described with reference to FIGS.
[0023]
At the time of ABS control when the left front wheel is about to enter the locked state, first the wheel brake B for the left front wheel_FLThe decompression control of the control valve means 6 is performed as shown in FIG._FLNormally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLExciting and opening the valve, master cylinder M and wheel brake B for the left front wheel_FLWheel brake B for the left front wheel_FLThe first reservoir 7A communicates with each other. As a result, the wheel brake B for the left front wheel_FLBrake fluid is released to the first reservoir 7A, and the left front wheel brake B_FLThe brake fluid pressure is reduced. At this time, the first actuator 9A that drives the first pump 8A remains stopped.
[0024]
At the time of holding the hydraulic pressure following the pressure reduction control, as shown in FIG._FLNormally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLIs demagnetized and closed, and the master cylinder M, the first reservoir 7A, and the wheel brake B for the left front wheel_FLBlock between the two. As a result, the wheel brake B for the left front wheel_FLIn this case, the first actuator 9A for driving the first pump 8A remains stopped.
[0025]
Further, when the friction coefficient of the traveling road surface is low at the time of pressure increase following the hydraulic pressure holding, as shown in FIG._FLNormally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLBy demagnetizing and closing the valve, the master cylinder M and the first reservoir 7A and the wheel brake B for the left front wheel_FLThe first pump 8A is actuated by the first actuator 9A in a state in which the gap between the two is interrupted. Then, the brake fluid pressure generated by the brake fluid pumped from the first reservoir 7A to the first pump 8A becomes the wheel brake B for the left front wheel._FLActing on the wheel brake B for the left front wheel_FLThe brake fluid pressure is increased.
[0026]
At the time of sudden pressure increase when the friction coefficient of the road surface is low, the control valve means 6_FLNormally open solenoid valve 11_FLIs demagnetized and opened, and the normally closed solenoid valve 13_FLIs demagnetized and closed, the master cylinder M and the wheel brake B for the left front wheel_FLWheel brake B for the left front wheel_FLBetween the first reservoir 7A and the brake pressure from the master cylinder M to the wheel brake B for the left front wheel._FLIn this case, by setting the discharge pressure of the first pump 8A lower than the output hydraulic pressure of the master cylinder M, the discharge pressure of the first pump 8A is set to the master cylinder M side. There is no effect.
[0027]
Further, when the pressure is increased by the ABS control when the friction coefficient of the road surface is high, the control is performed in the state where the operation of the first actuator 9A, that is, the first pump 8A is stopped, as in the normal brake operation shown in FIG. Valve means 6_FLNormally open solenoid valve 11_FLIs demagnetized and opened, and the normally closed solenoid valve 13_FLIs demagnetized and closed, and the hydraulic pressure output from the master cylinder M is the wheel brake B for the left front wheel._FLActing on the wheel brake B_FLThe brake pressure is increased.
[0028]
Wheel brake B for right front wheel_FRFor the ABS control, the wheel brake B for the left front wheel described above_FLControl valve means 6 as in the ABS control_FRIs controlled, and the second actuator 9B that drives the second pump 8B has a wheel brake B for the right front wheel in a state where the friction coefficient of the traveling road surface is low._FRIt operates only when the brake fluid pressure is increased.
[0029]
In this way, the wheel brake B for the left front wheel_FLAnd wheel brake B for right front wheel_FREach wheel brake B during ABS control_FL, B_FRWhen the pressure is increased while the friction coefficient of the traveling road surface is low, the brake fluid in the first and second reservoirs 7A and 7B is pumped up by the first and second pumps 8A and 8B. As a result, even when the road surface has a particularly low friction coefficient, the reservoirs 7A and 7B are not filled with the brake fluid, and the ABS control can be continued for a long time.
[0030]
Further, since it is not necessary for both pumps 8A and 8B to discharge the hydraulic pressure that overcomes the output hydraulic pressure of the master cylinder M, both pumps 8A and 8B can be reduced in size and weight, and both pumps 8A and 8B can be reduced. The first and second actuators 9A and 9B that are driven can be reduced in size and weight.
[0031]
Furthermore, both pumps 8A and 8B have wheel brakes B for the left and right front wheels when the friction coefficient of the road surface is low._FL, B_FROnly when the brake fluid pressure is increased, ABS operation noise can be reduced and power consumption can be reduced. Moreover, the control valve means 6 is used when the pumps 8A and 8B are operated._FL, 6_FRMaster cylinder M and each wheel brake B_FL, B_FRSince the gap is cut off, the discharge pressures of the pumps 8A and 8B do not act on the master cylinder M side, so that the kickback can be prevented from occurring, and the driver feels uncomfortable due to the kickback. There is nothing. Moreover, energy consumption can be reduced by stopping the operation of the pumps 8A and 8B on a road surface with a high friction coefficient.
[0032]
Wheel brake B for the right rear wheel_RRAnd wheel brake B for left rear wheel_RLRegarding the pressure reduction and holding control in the ABS control, the wheel brake B for the left front wheel and the right front wheel described above_FL, B_FRControl valve means 6 as in the decompression and holding control of_RR, 6_RLIs controlled. However, wheel brake B for the right rear wheel_RRAnd wheel brake B for left rear wheel_RLDuring the pressure increase control in the ABS control, the control valve means 6_RR, 6_RLNormally open solenoid valve 11_RR, 11_RLIs demagnetized, opened, and normally closed solenoid valve 13_RR, 13_RLIs demagnetized and closed. That is, the wheel brake B for the right rear wheel_RRAnd wheel brake B for left rear wheel_RLIs a normally open solenoid valve 11_RR, 11_RLIs increased by the output hydraulic pressure of the master cylinder M, and the discharge pressure of each pump 8A, 8B is used for the left front wheel and the right front wheel when the friction coefficient of the traveling road surface is low. Wheel brake B_FL, B_FRTherefore, the pumps 8A and 8B and the actuators 9A and 9B can be further reduced in size and weight.
[0033]
Further, the first and second pumps 8A and 8B can operate independently of each other, and wheel brakes B corresponding to the pumps 8A and 8B, respectively._FL, B_FRDepending on the brake fluid pressure control state, it is possible to individually control the operation / stop of each pump 8A, 8B, or to vary the drive time of each pump 8A, 8B. Control can be executed more precisely, and energy consumption can be reduced and pump operating noise can be reduced.
[0034]
Moreover, the wheel brake B for the left and right front wheels_FL, B_FRThe wheel brake B for the left and right rear wheels_RL, B_RRWheel brake B for the left and right front wheels, which have more liquid consumption than_FL, B_FRBy increasing the brake fluid pressure with the discharge pressure of each pump 8A, 8B, the efficiency of ABS control can be increased.
[0035]
Further, the discharge ports 30 of the pumps 8A, 8B are wheel brakes B for the left and right front wheels, which are drive wheels._FL, B_FRAnd those wheel brakes B_FL, B_FRControl valve means 6 corresponding to_FL, 6_FRAre connected to each other, during the non-brake operation in which the brake pedal 3 is not operated, traction control can be performed so as to reduce the driving force of the left and right front wheels.
[0036]
That is, when executing the traction control for reducing the driving force of the left front wheel, as shown in FIG._FLNormally open solenoid valve 11_FLAnd normally closed solenoid valve 13_FLIs demagnetized and closed, and the master cylinder M, the first reservoir 7A, and the wheel brake B for the left front wheel_FLThe first pump 8A is actuated by the first actuator 9A in a state where both are disconnected from each other, and the brake fluid pressure caused by the brake fluid pumped from the first reservoir 7A is changed to the wheel brake B for the left front wheel._FLBrake B for the left front wheel_FL, And traction control by reducing the driving force of the left front wheel can be performed.
[0037]
At this time, the first reservoir 7A is connected to the left front wheel brake B._FLWheel brake B for the right rear wheel, which is a driven wheel in common_RRControl valve means 6 corresponding to_RRThen, normally open type solenoid valve 11_RRIs demagnetized and opened, and the normally closed solenoid valve 13_RRIs excited and opened. Thereby, the master cylinder M and the first reservoir 7A and the wheel brake B for the right rear wheel._RRAnd the suction port 32 (see FIG. 8) of the first pump 8A communicates with the master cylinder M, and brake fluid from the master cylinder M in the non-operating state is supplied to the first pump 8A. Brake B for the left front wheel_FLIt is not necessary to always store the brake fluid in the first reservoir 7A. Moreover, it is not necessary to provide a means dedicated to traction control, and the first pump 8A and the control valve means 6 are used._FL, 6_RRThe traction control can be executed simply by changing the above control from that during the ABS control.
[0038]
Wheel brake B for the right front wheel, which is another drive wheel_FRAs for wheel brake B for the left front wheel mentioned above_FLAs with control valve means 6_FR, 6_RLBy controlling the traction control, it is possible to execute traction control that reduces the driving force of the right front wheel.
[0039]
6 and 7, each normally open solenoid valve 11 of the brake fluid pressure control device is used._FL, 11_FR, 11_RL, 11_RREach normally closed solenoid valve 13_FL, 13_FR, 13_RL, 13_RRThe reservoirs 7A and 7B and the hydraulic pressure generating units 14A and 14B are attached to the one surface 16a side of the rectangular block-shaped base 16 made of, for example, an aluminum alloy from the same direction.
[0040]
On one surface 16 a of the base body 16, each normally open type electromagnetic valve 11 is provided._FL~ 11_RRCorresponding to each of the four bottomed first mounting holes 17 arranged in a line and each normally closed solenoid valve 13._FL~ 13_RRCorresponding to the first mounting holes 17..., Four bottomed second mounting holes 18 aligned in a row in parallel with the first mounting holes 17, and the first mounting holes 17. A pair of bottomed reservoir forming holes 19, 19 arranged on the opposite side of the row of the two, and a pair of bottomed reservoir forming holes 19, 19 and a pair of bottomed reservoir forming holes 18, 19 and the second mounting holes 18. Third attachment holes 20, 20 are provided.
[0041]
Each normally open solenoid valve 11_FL~ 11_RRHas a valve portion 11a and a solenoid portion 11b, and the valve portion 11a is fitted and fixed to the first mounting hole 17 so that the solenoid portion 11b protrudes from one surface 16a of the base 16. Therefore, each normally open solenoid valve 11_FL~ 11_RRIs attached to the one surface 16 a side of the base 16.
[0042]
Normally closed solenoid valve 13_FL~ 13_RRHas a valve portion 13a ... and a solenoid portion 13b ..., and the valve portion 13a ... is fitted and fixed to the second mounting hole 18 ... so that the solenoid portion 13b ... protrudes from one surface 16a of the base 16. Therefore, each normally closed solenoid valve 13_FL~ 13_RRIs attached to the one surface 16 a side of the base 16.
[0043]
The reservoirs 7A and 7B have a bottomed cylindrical shape that is liquid-tightly and slidably fitted into the reservoir forming holes 19 so as to form a storage chamber 21 between the closed ends of the reservoir forming holes 19. A piston member 22, an open hole 23 at the center, a lid member 24 fitted to the open end side of the reservoir forming hole 19, and an outer peripheral edge of the lid member 24. In order to prevent the lid members 24 from being detached from the reservoir forming holes 19 ..., the retaining members 25 ... are mounted on the inner surfaces of the open ends of the reservoir forming holes 19 ..., and the lid members 24 ... are contracted between the lid members 24 ... and the pistons 22 .... And the springs 26.
[0044]
In FIG. 8, the first pump 8 </ b> A includes a bottomed cylindrical pump housing 28 having an end wall 28 a at one end, and a rod-shaped plunger 29 slidably fitted to the pump housing 28.
[0045]
A discharge port 30 is provided at the center of the end wall 28a, and a pump chamber 31 is formed between one end of the plunger 29 and the end wall 28a. The other end of the plunger 29 protrudes from the other end of the pump housing 28. The other end of the plunger 29 extends along one diameter line of the plunger 29 and both ends are open to the outer surface of the plunger 29. A squeezed inlet 32 is provided. Further, a communication passage 34 is provided coaxially with the plunger 29 so that the opening of one end faces a tapered valve seat 33 provided at the center of one end of the plunger 29, and the other end of the communication passage 34 communicates with the suction port 32.
[0046]
A suction valve 35 capable of closing one end opening of the communication passage 34 is accommodated in the pump chamber 31. The suction valve 35 includes the valve seat 33 and a spherical valve that can be seated on the valve seat 33. And a spring 37 that is provided between the end wall 28a of the pump housing 28 and the valve body 36 and that exerts a spring force that urges the valve body 36 in the direction of seating on the valve seat 33.
[0047]
The suction valve 35 opens as the pressure of the pump chamber 31 is reduced as the plunger 29 moves in the direction of increasing the volume of the pump chamber 31 (upward in FIG. 8). Brake fluid is sucked into the pump chamber 31 from the port 32 through the communication passage 34, and the pressure in the pump chamber 31 is increased as the plunger 29 moves in a direction to reduce the volume of the pump chamber 31. In response to this, the valve is closed and the brake fluid is prevented from flowing into the pump chamber 31 from the communication passage 34.
[0048]
The third mounting hole 20 provided in the base 16 includes a small diameter portion 20a with one end closed, and a large diameter portion 20b formed coaxially with the other end of the small diameter portion 20a and having a larger diameter than the small diameter portion 20b. The pump housing 28 is fitted into the small diameter portion 20a so as to form a discharge liquid chamber 38 between one end portion thereof and one end closed portion of the small diameter portion 20a. Is attached with an annular seal member 39 that elastically contacts the inner peripheral surface of the small diameter portion 20a.
[0049]
A discharge valve 40 is mounted on the pump housing 28 in the discharge liquid chamber 38. The discharge valve 40 faces the discharge port 30 leading to the pump chamber 31 toward the center, and the discharge liquid chamber 38 on the end wall 28a. A tapered valve seat 41 provided on the side surface, a spherical valve body 42 that can be seated on the valve seat 41, a retainer 44 attached to one end of the pump housing 28, and the valve body 42. The retainer 44 includes a spring 43 that exerts a spring force that urges the body 42 in the seating direction of the valve seat 41, and the retainer 44 has a communication hole 45 for preventing the discharge liquid chamber 38 from being partitioned. Is provided.
[0050]
Such a discharge valve 40 closes as the pressure of the pump chamber 31 is reduced as the plunger 29 moves in the direction of increasing the volume of the pump chamber 31, and discharges from the discharge liquid chamber 38. Although the brake fluid is prevented from flowing into the pump chamber 31 through the outlet 30, the pressure in the pump chamber 31 is increased as the plunger 29 moves in the direction of decreasing the volume of the pump chamber 31. In response to this, the valve is opened, and the brake fluid is discharged from the pump chamber 31 to the discharge fluid chamber 38 through the discharge port 30.
[0051]
The base body 16 is provided with a discharge passage 46 having one end communicating with the discharge liquid chamber 38, and the other end of the discharge passage 46 is a wheel brake B for the left front wheel._FLAnd control valve means 6_FLConnected between. That is, the discharge port 30 of the first pump 8A is the wheel brake B for the left front wheel._FLThe brake fluid flow from the side to the first pump 8A side is blocked by the discharge valve 40 so that the wheel brake B for the left front wheel_FLAnd control valve means 6_FLWill be connected in between.
[0052]
The first actuator 9A is a solenoid that includes a fixed core 48 and a movable core 49 that is coaxially connected to the plunger 29 of the first pump 8A so as to be close to and away from the fixed core 48.
[0053]
The fixed core 48 is formed in a cylindrical shape from a magnetic metal, and the distal end portion of the connecting tube portion 50 in which the base end portion is coaxially and integrally connected to one end of the fixed core 48 is the first pump. The other end of the pump housing 28 in 8A is coupled by press fitting or the like. In addition, a flange portion 51 that projects radially outward from the connecting portion of the fixed core 48 and the connecting tube portion 50 is provided integrally with the fixed core 48 and the connecting tube portion 50.
[0054]
In addition, the other end portion of the plunger 29 in the first pump 8A protrudes from the other end of the pump housing 28 and is slidably fitted into the connecting tube portion 50. Is mounted with an annular seal member 52 that elastically slides on the outer surface of the other end of the plunger 29.
[0055]
The flange portion 51 is fitted into the large-diameter portion 20b of the third mounting hole 20, and an annular chamber 53 is formed between the inner peripheral surface of the large-diameter portion 20b and the outer peripheral surface of the connecting tube portion 50, and the flange portion An annular seal member 54 that elastically contacts the inner surface of the large-diameter portion 20 b is attached to the outer surface of 51. A retaining ring 55 that contacts the outer surface of the outer peripheral edge of the flange portion 51 is attached to the inner surface of the opening end side of the large-diameter portion 20b.
[0056]
The fixed core 48 and the connecting cylinder portion 50 are fitted with a guide member 57 formed of a magnetic material in a bottomed cylindrical shape, and the inner end is fitted into an annular groove 58 provided on the outer periphery of the guide member 57. The pins 59 that together define the axial position of the guide member 57 are fitted into the fixed core 48 with an axis along the radial direction of the guide member 57. Thus, the plunger 29 is interposed between one end of the guide member 57 whose axial position in the fixed core 48 and the connecting cylinder portion 50 is determined, and the other end of the plunger 29 and the tip end portion of the connecting cylinder portion 50. An inhalation fluid chamber 60 is formed in communication with the suction port 32 provided in the guide member 57, and the other end of the guide member 57 is disposed so as not to protrude from the fixed core 48 toward the movable core 49. Further, the outer end of the pin 59 does not protrude from the outer surface of the fixed core 48 in the fitted state to the fixed core 48.
[0057]
The connecting cylinder portion 50 is provided with a plurality of communication passages 61 that allow the annular chamber 45 to communicate with the suction liquid chamber 60, and the base body 16 is provided with a suction passage 62 that allows one end to pass through the annular chamber 45. The other end of 62 is connected to the first reservoir 7A. That is, the inlet 32 of the first pump 7A communicates with the first reservoir 7A.
[0058]
The fixed core 48 is coupled to the guide cylinder 63. The guide cylinder 63 is formed in a bottomed cylindrical shape having one end side opened by a nonmagnetic material and the other end side hemispherically closed, and the fixed core 48 is press-fitted into one end side of the guide cylinder 63. Then, the fixed core 48 and the guide cylinder 63 are welded.
[0059]
The movable core 49 is slidably fitted into the guide cylinder 63 so as to face the fixed core 48. One end of the movable core 49 is in contact with the other end of a rod 64 made of a non-magnetic material that is coaxially in contact with the other end of the plunger 29 in the first pump 8A. The rod 64 is a guide member. 57 is slidably fitted. In the suction fluid chamber 60, a spring 65 is provided between the plunger 29 and the connecting tube portion 50 to exert a spring force in a direction in which the plunger 29 abuts against the rod 64. The spring force of the spring 65 is as follows. The movable core 49 acts on the movable core 49 via the rod 64, and the movable core 49 is urged away from the fixed core 48 by the spring force of the spring 65. Note that the spring force of the spring 37 in the suction valve 35 also acts on the plunger 29 in the direction in which it abuts against the rod 64, but the spring load of the spring 37 is set smaller than the spring load of the spring 65.
[0060]
To prevent the movable core 49 from moving away from the fixed core 48 due to residual magnetism when the movable core 49 directly contacts the fixed core 48 between the movable core 49 and the fixed core 48. A ring-shaped spacer 66 made of a nonmagnetic material is interposed between the movable core 49 and the movable core 49 separated from the fixed core 48.
[0061]
The guide cylinder 63 is coaxially surrounded by a synthetic resin bobbin 67, and a coil 68 is wound around the bobbin 67.
[0062]
The bobbin 67 and the coil 68 are covered with a magnetic path forming cylinder 69 made of magnetic metal. One end of the magnetic path forming cylinder 69 is integrally formed so that an abutting flange 69a that comes into contact with the flange portion 51 with the inner periphery approaching and facing one end outer surface of the guide cylinder 63 projects radially inward. The other end of the magnetic path forming cylinder 69 is provided with a through hole 70a for projecting the other end of the guide cylinder 63 in the center, and extends along the one diameter line of the guide cylinder 63. Both ends of the magnetic path forming plate 70 are coupled by caulking coupling or the like. A spring 71 that exerts a spring force that presses the bobbin 67 against the magnetic path forming plate 70 is provided between the contact flange 69 a of the magnetic path forming cylinder 69 and the bobbin 67.
[0063]
In such a first actuator 9A, when the coil 68 is in a demagnetized state, the movable core 49 is at a position separated from the fixed core 48 by the spring force of the spring 65 (position in FIG. 8). The plunger 29 is moved to a position where the volume of the pump chamber 31 is increased. When the coil 68 is energized, the movable core 49 moves in the direction approaching the fixed core 48 against the spring force of the spring 65, and the plunger 29 of the first pump 8A reduces the volume of the pump chamber 31. Driven to the side. That is, by switching the demagnetization / excitation of the coil 68, the movable core 49 is reciprocated in the axial direction, and the plunger 29 is reciprocated in the axial direction accordingly, and the first pump 8A is pumped.
[0064]
By the way, when the space between the movable core 49 and the fixed core 48 and the closed end of the guide tube 63 and the space between the movable cores 49 are in a sealed state, the addition of each space according to the reciprocating movement of the movable core 49, The pressure is reduced, and the smooth reciprocation of the movable core 49 is hindered. Therefore, a communication groove 72 connecting the two spaces is provided on the outer surface of the movable core 49 over the entire length in the axial direction. Further, a groove 73 along one diameter line of the rod 64 is provided on one end face of the rod 64 facing the suction liquid chamber 60, and one diameter of the rod 64 is provided on the other end face of the rod 64 contacting the movable core 49. A groove 74 is provided along the line, and the rod 64 is provided with a communication hole 75 connecting the grooves 73 and 74 coaxially. That is, the suction fluid chamber 60 communicates with the space between the movable core 49 and the fixed core 48 via the groove 73, the communication hole 75 and the groove 74, and the space between the movable core 49 and the fixed core 48 passes through the communication groove 72. The guide cylinder 63 communicates with the closed end and the space between the movable core 49.
[0065]
The second pump 8B and the second actuator 9B are configured similarly to the first pump 8A and the first actuator 9A described above.
[0066]
Referring again to FIG. 6, each normally open solenoid valve 11_FL~ 11_RRIn the upper part of the solenoid part 11b, each normally closed solenoid valve 13_FL~ 13_RRThe upper part of the solenoid part 13b ..., the bobbins 67 ... of both actuators 9A, 9B, the upper part of the magnetic path forming cylinder 69 ... and the magnetic path forming plate 70 ... are unitized by a mold part 76 made of synthetic resin, Each normally open solenoid valve 11_FL~ 11_RRAre fitted and fixed in the first mounting holes 17, and each normally closed solenoid valve 13 is fixed._FL~ 13_RRAre fitted and fixed in the second mounting holes 18, and the flange portion 51 integrated with the fixed core 48 is welded after the guide cylinder 63 is welded in the both hydraulic pressure generating units 14A and 14B. 3 are fitted and fixed in the mounting holes 20... And the bobbins 67 around which the coils 68 are wound, the magnetic path forming cylinder 69, the magnetic path forming plate 70, and the spring 71. ... are assembled at the same time, and each normally open solenoid valve 11_FL~ 11_RREach normally closed solenoid valve 13_FL~ 13_RRAnd the assembly | attachment to the base | substrate 16 of both hydraulic-pressure generation | occurrence | production units 14A and 14B can be completed.
[0067]
By the way, on one surface 16a of the base body 16 ..., the reservoirs 7A and 7B and the normally open solenoid valves 11 are provided._FL~ 11_RREach normally closed solenoid valve 13_FL~ 13_RRA cover 77 made of synthetic resin is fastened by a plurality of bolts 78 so as to cover both the hydraulic pressure generating units 14A and 14B, and an electronic control unit (ECU) is disposed in the upper portion of the cover 77. A non-conductive substrate 79 on which 80 and other electronic components are mounted is inserted and fixed. Each normally open solenoid valve 11 is connected to a bus bar 81 connected to the substrate 79._FL~ 11_RRTerminal 82 extending upward from the solenoid portion 11b of each of the normally closed solenoid valves 13_FL~ 13_RRAre connected to terminals 83 extending upward from the solenoid portions 13b, and terminals 84 extending upward from the actuators 19A, 19B of both hydraulic pressure generating units 14A, 14B.
[0068]
Next, the operation of this embodiment will be described. Each pump 8A, 8B is configured such that a plunger 29 with one end facing the pump chamber 31 is slidably fitted into a pump housing 28, and reciprocates. The electric actuators 9A and 9B are coaxially connected to the plungers 29, and the connection structure of the pumps 8A and 8B and the actuators 9A and 9B can be simplified, and the pumps 8A and 8B and The operating efficiency of each actuator 9A, 9B can be improved.
[0069]
Moreover, each of the actuators 9A and 9B is a solenoid including a fixed core 48 and a movable core 49 that is coaxially connected to the plunger 29 so as to be close to and away from the fixed core 48. The cost can be reduced by making 9B a simpler configuration.
[0070]
In addition, hydraulic pressure generating units 14A and 14B in which actuators 9A and 9B are coaxially connected to plungers 29 of the pumps 8A and 8B, reservoirs 7A and 7B, and each normally open type electromagnetic valve 11_FL~ 11_RRAnd each normally closed solenoid valve 13_FL~ 13_RRAre attached to the base 16 from the same direction, so that the hydraulic pressure generating units 14A and 14B, the reservoirs 7A and 7B, and the normally open solenoid valves 11_FL~ 11_RRAnd each normally closed solenoid valve 13_FL~ 13_RRIt is only necessary to perform the process for attaching the actuator 9A, 9B, each normally open solenoid valve 11 on the one surface 16a side of the base 16._FL~ 11_RRAnd each normally closed solenoid valve 13_FL~ 13_RRIt is not necessary to process the base 16 or route the conductor in order to make electrical connection to the same place. Therefore, it is possible to simplify the processing of the base body 16 to reduce the number of processing steps and improve the assemblability, and to reduce the size of the base body 16 and the entire apparatus.
[0071]
In the above embodiment, solenoids are used as the actuators 9A and 9B. However, the actuators 9A and 9B may be any actuator that reciprocates in the axial direction, and the actuators 9A and 9B may be small in size. It is also possible to use a piezoelectric element as an actuator.
[0072]
In the above embodiment, the wheel brake B of the drive wheel_FL, B_FRThe pumps 8A and 8B are provided so that the brake fluid can be supplied only to the wheel brake._FL, B_FR, B_RL, B_RRIn any case, the present invention can be applied to a so-called reflux type antilock brake control device which can supply brake fluid from the pumps 8A and 8B.
[0073]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0074]
【The invention's effect】
  As described above, according to the present invention,Includes an actuator and a plunger pump coaxially connected to the actuatorHydraulic pressure generation unitWhen,ReservoirWhen,Each normally open solenoid valveWhen,Each normally closed solenoid valveWhenThe processing for mounting the base ofOne sideIt is not necessary to process the base or route the conductor to make electrical connection to the actuator, each normally open solenoid valve, and each normally closed solenoid valve at the same location. In addition, it is possible to simplify the processing of the substrate to reduce the number of processing steps and improve the assemblability, and to reduce the size of the substrate and the entire apparatus. Also substrateThe continuous surface ofIs covered with a cover to which the board on which the electronic control unit is mounted is fastened. The cover covers the reservoir, each normally open solenoid valve, each normally closed solenoid valve, and the hydraulic pressure generating unit from the same direction. In addition, terminals extending from the normally open solenoid valve, the normally closed solenoid valve, and the hydraulic pressure generating unit are connected to the substrate.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram of a vehicle brake hydraulic pressure control device.
FIG. 2 is a hydraulic circuit diagram corresponding to FIG. 1 and showing a reduced pressure state in ABS control.
FIG. 3 is a hydraulic circuit diagram corresponding to FIG. 1 showing a hydraulic pressure holding state in the ABS control.
FIG. 4 is a hydraulic circuit diagram corresponding to FIG. 1 and showing a pressure increase state in ABS control.
FIG. 5 is a hydraulic circuit diagram corresponding to FIG. 1 showing a traction control state.
FIG. 6 is a longitudinal side view of a vehicle brake hydraulic pressure control device.
7 is a plan view of the base body as viewed from the direction of arrows 7-7 in FIG. 6;
8 is an enlarged sectional view taken along line 8-8 in FIG. 6;
[Explanation of symbols]
7A, 7B ... Reservoir
8A, 8B ... Pump
9A, 9B ... Actuator
11_FL, 11_FR, 11_RL, 11_RR... Normally open solenoid valves
13_FL, 13_FR, 13_RL, 13_RR... Normally closed solenoid valves
14A, 14B ... Hydraulic pressure generating unit
16 ... Substrate
28 ... Pump housing
29 ... Plunger
31 ... Pump room
77 ... Cover
79 ... Substrate
80 ... Electronic control unit
82-84 terminal
B_FL, B_FR, B_RL, B_RR... Wheel brakes
M ... Master cylinder

Claims (1)

Reservoir (7A, 7B) for storing brake fluid, and a plurality of normally open types respectively provided in a hydraulic circuit between a plurality of wheel brakes ( _BFL , _BFR , _BRL , _BRR ) and a master cylinder (M) Solenoid valves (11 _FL , 11 _FR , 11 _RL , 11 _RR ) and hydraulic circuits between the wheel brakes (B _FL , B _FR , B _RL , B _RR ) and the reservoirs (7 A, 7 B) are provided. A plurality of normally closed solenoid valves (13 _FL , 13 _FR , 13 _RL , 13 _RR ) and the brake fluid of the reservoirs (7 A, 7 B) are pumped up and the wheel brakes (B _FL , B _FR , B _RL , B At least a portion of the wheel brake (B _FL, and B _FR) can be supplied with brake fluid pump (8A, 8B), the pump (8A, the electric driving the 8B) actuator (9A of _RR), 9B ) Is attached to a common base (16) In a vehicle brake fluid pressure control device,
A plunger type pump (8A, 8B) in which a plunger (29) having one end facing the pump chamber (31) is slidably fitted to a pump housing (28), and the pump (8A, 8B) The hydraulic pressure generating unit (14A, 14B) is composed of the actuator (9A, 9B) which is coaxially connected to the actuator (9A, 9B) and reciprocates to drive the pump (8A, 8B) .
The hydraulic pressure generating unit (14A, 14B), said reservoir (7A, 7B), wherein the normally open electromagnetic valve _{(11 FL, 11 FR, 11} RL, 11 RR) and the respective normally closed electromagnetic valve (13 _FL , 13 _FR , 13 _RL , 13 _RR ) are attached to the continuous surface (16a) of the base body (16 ) in the same direction and in parallel with each other ,
A cover (77) to which a substrate (79) on which the electronic control unit (80) is mounted is fastened to the continuous surface (16a) of the base body (16) , and the cover (77) reservoir (7A, 7B), wherein the normally open electromagnetic valve _{(11 FL, 11 FR, 11} RL, 11 RR), wherein the normally closed electromagnetic valve _{(13 FL, 13 FR, 13} RL, 13 RR) and the hydraulic pressure generating unit (14A, 14B) together is covered in the same direction, they normally open electromagnetic valve _{(11 FL, 11 FR, 11} RL, 11 RR), the normally closed electromagnetic valve (13 _FL, 13 _FR, 13 _RL , 13 _RR ) and terminals (82 to 84) extending from the hydraulic pressure generating units (14A, 14B) are connected to the substrate (79).

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