JPH0811692A - Brake fluid pressure control actuator for vehicle - Google Patents

Abstract

PURPOSE:To improve the radiating capability of an electronic control unit mounted on a brake fluid pressure control actuator. CONSTITUTION:An electronic control unit 110 is arranged in a cover 106 to cover an electromagnetic drive part of a solenoid shutoff valve mounted on one side of an actuator body 102, and a heat exchanger plate to thermally brought in contact the board of the electronic control unit 110 with an actuator body 102 is provided so as to radiate heat of the electronic control unit 110 from the actuator body 102 to the atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of the present application relates to a vehicle brake fluid pressure control actuator, and more particularly to a vehicle brake fluid pressure control actuator which is inserted in a fluid pressure path from a vehicle brake master cylinder to a wheel brake. An actuator body that forms part of the pressure path is equipped with an electromagnetically operated hydraulic pressure control valve that controls the flow of brake fluid into and out of the wheel brakes, and an electronic control unit that electrically operates this hydraulic pressure control valve. The present invention relates to an attached vehicle brake fluid pressure control actuator.

[0002]

2. Description of the Related Art Vehicle brake fluid pressure control actuators for antilock control and traction control are well known. In this vehicle brake fluid pressure control actuator, in the actuator body forming a part of the fluid pressure path from the brake master cylinder to the wheel brakes,
An electromagnetically operated hydraulic control valve is installed to control the flow of brake fluid into and out of the wheel brakes. The electromagnetic drive units of the plurality of electromagnetic valves forming the hydraulic control valve are generally configured to be electrically connected to an electronic control unit separate from the actuator by a harness.
For example, the vehicle brake fluid pressure control actuators described on pages 3-2 to 3-9 of the Toyota Crown Hardtop new model manual (issued by Toyota Motor Corporation Service Department on August 17, 1993) are: , An electromagnetically operated hydraulic pressure control valve that controls the flow of brake fluid into and out of the wheel brakes, a low pressure reservoir that stores the brake fluid that has flowed out of the wheel brakes by the hydraulic pressure control valve, and a brake in this low pressure reservoir A positive displacement pump for returning liquid to the hydraulic pressure passage and an electric motor for driving the positive displacement pump are assembled into a single actuator body. The drive unit and the electric motor are electrically connected to the electronic control unit and the battery separate from the present actuator by separate harnesses.

In recent years, for the purpose of reducing the number of assembling steps, downsizing, and reducing the number of constituent parts, an electronic control unit is installed in an inner space of a cover that covers a plurality of electromagnetic drive units to protect it from water and dust. It has been proposed to deploy (eg
See Japanese Patent Application Publication No. 3-501109).

[0004]

When the electronic control unit is attached to the brake fluid pressure control actuator, the problem is that the heat generated by the electronic components forming the electronic control unit is released to the outside. It is to protect from heat damage. The above-mentioned patent application publication No. 3-501109
In the conventional device of No. 1, the top of the cover is a heat dissipation plate formed of a material having good thermal conductivity (for example, aluminum alloy), and the ceramic substrate of the electronic control unit is thermally contacted with the inner surface of the heat dissipation plate. There is. However, if the heat dissipation plate is a simple plate, the heat dissipation area is insufficient, and heat dissipation fins must be formed on the surface of the heat dissipation plate to secure the required surface area of the heat dissipation plate. There is a problem that the size of the pressure control actuator becomes large and the mountability on the vehicle deteriorates. Further, the ceramic substrate has poor heat conduction, which is not preferable for improving heat dissipation performance.

According to the invention of this application, an electromagnetically operated hydraulic pressure for controlling the inflow / outflow of the brake fluid to / from the wheel brake is provided in an actuator body forming a part of the hydraulic pressure path from the brake master cylinder of the vehicle to the wheel brake. A brake fluid pressure control actuator for a vehicle, in which a control valve and an electronic control unit for electrically operating the hydraulic control valve are assembled, and a heat generated by electronic components constituting the electronic control unit is sufficiently generated. A first object of the present invention is to provide a vehicle brake fluid pressure control actuator that can radiate heat and that can be made smaller than conventional devices.

Further, the invention of this application is an electromagnetic operation type for controlling the inflow / outflow of the brake fluid to / from the wheel brake in an actuator body forming a part of a hydraulic pressure path from the brake master cylinder of the vehicle to the wheel brake. A hydraulic pressure control valve, a low pressure reservoir for storing the brake fluid that has flowed out of the wheel brake by the hydraulic pressure control valve, a positive displacement pump that returns the brake fluid in the low pressure reservoir to the hydraulic pressure passage, and the positive displacement pump A brake hydraulic pressure control actuator for a vehicle, in which an electric motor for driving the electric motor and an electronic control unit for operating the electric motor and the hydraulic pressure control valve are assembled, wherein heat generated by electronic parts constituting the electronic control unit is It can radiate heat sufficiently and can be made smaller than the conventional device, and the electrical connection between the electronic control unit, the electric motor and the hydraulic pressure control valve is low cost. In to provide a vehicle brake hydraulic pressure control actuator can be achieved with the second object.

[0007]

According to the first object of the present invention, the vehicle brake fluid pressure control actuator according to claim 1 is inserted in a fluid pressure path from a brake master cylinder of a vehicle to a wheel brake. The actuator body forming a part of the hydraulic path,
With a vehicle brake fluid pressure control actuator that is equipped with an electromagnetically operated hydraulic pressure control valve that controls the flow of brake fluid into and out of the wheel brakes, and an electronic control unit that electrically operates this hydraulic pressure control valve. Then, on one side surface of the actuator body made of metal, the electromagnetic drive parts of the plurality of electromagnetic valves constituting the hydraulic control valve are arranged in parallel, and a cover for covering these electromagnetic drive parts is provided. The cover is watertightly mounted, and a metal heat transfer plate located across the electromagnetic drive unit is mounted in an internal space of the cover in a state of being in thermal contact with the actuator body. The substrate of the electronic control unit is in thermal contact with the heat transfer plate.

According to a second aspect of the present invention, there is provided a vehicle brake fluid pressure control actuator according to the second aspect of the invention.
The vehicle brake fluid pressure control actuator according to claim 1, wherein the actuator body has a low pressure reservoir for storing brake fluid flowed out of the wheel brake by the fluid pressure control valve, and a low pressure reservoir in the low pressure reservoir. A positive displacement pump that returns the brake fluid to the hydraulic pressure passage and an electric motor that drives the positive displacement pump are assembled, and the cover is electrically connected to various sensors such as a battery and a wheel rotation sensor. A connector terminal for electrically connecting the electronic control unit and the terminal of the electric motor to each other, and surrounding the plurality of electromagnetic drive units, and watertightly attached to the actuator body. It is composed of a frame body and a lid body that is watertightly attached to the frame body and covers the electronic control unit. The electric motor is attached to the other side surface of the actuator body that opposes the one side surface, and a pair of terminals of the electric motor are formed by a pair of conductors penetrating a pair of through holes formed in the actuator body. The electronic control unit is connected to a corresponding connection terminal of the connection terminals, and the electronic control unit is directly electrically connected to a corresponding terminal of the connector terminal and a corresponding terminal of the connection terminal. The heat plate has a leg portion that penetrates the frame body and is in thermal contact with the actuator body.

In the vehicle brake fluid pressure control actuator according to any one of claims 1 and 2, the board of the electronic control unit is formed of a metal, and one surface of the board is in thermal contact with the heat transfer plate. And an FPC (flexible printed circuit board) adhered to the other surface of the plate.

[0010]

In the brake fluid pressure control actuator of claim 1, the heat generated by the electronic parts of the electronic control unit is conducted from the substrate to the metal actuator body through the heat transfer plate, and is radiated from the actuator body to the atmosphere. To be done. Since the actuator body has a surface area much larger than the top of the cover, the heat generated by the electronic components of the electronic control unit can be sufficiently radiated into the atmosphere.

In the brake fluid pressure control actuator according to a second aspect of the present invention, in addition to the above, the terminal of the electric motor is electrically connected to the electronic control unit and the connector terminal via a conductor arranged inside the actuator body. Since this electronic control unit is covered with a lid, it does not require a harness and a resistor, can be made small and low in cost, and can be electronically controlled with terminals and conductors of the electromagnetic drive unit. The time and effort required for the electrical connection between the unit and the connector terminal can be reduced.

Since the board of the electronic control unit is composed of the metal plate and the FPC which are in thermal contact with the heat transfer plate, the heat generated by the electronic parts of the electronic control unit is effectively transferred to the heat transfer plate. And the heat dissipation is extremely good,
Since the difference in thermal expansion between the substrate and the heat transfer plate is reduced, the load on the electrical connection portion is reduced and the durability is improved.

[0013]

Embodiments of the invention of this application will be described with reference to the drawings.

FIG. 1 shows a front left wheel brake and a rear right wheel brake in one of the two pressure chambers of the master cylinder, and a front right wheel brake and a rear left wheel brake in the two pressure chambers of the master cylinder. 2 is a schematic hydraulic pressure path of a brake hydraulic pressure control actuator applied to a hydraulic brake device for an FF vehicle (front engine / front drive vehicle) connected to the other pressure chamber. In FIG. 1, the brake operating force applied to the brake pedal 10 is doubled by a negative pressure type booster 11 and applied to a tandem type master cylinder 12. As well known, the master cylinder 12 has two pressure chambers. Front, rear, left and right four wheel brakes 13, 14, 1
Among them, the left front wheel brake 13 and the right rear wheel brake 14 are connected to one of the two pressure chambers of the master cylinder via an actuator 15, and the right front wheel brake 16 and the left rear wheel brake 17 are connected. Is connected via an actuator 18 to the other pressure chamber of the two pressure chambers of the master cylinder.

The actuator 15 includes a two-port two-position normally open electromagnetic shut-off valve 19 capable of shutting off the front left wheel brake 13 from one pressure chamber of the master cylinder 12, and one rear pressure wheel brake 14 to one pressure of the master cylinder 12. 2 port 2 position normally open type electromagnetic shutoff valve 20 capable of shutting off from the chamber,
The check valves 21 and 22 arranged in parallel with the electromagnetic cutoff valves 19 and 20 and allowing only the flow of the brake fluid from the wheel brake side to the master cylinder side, and the left front wheel brake 13 in a single low pressure reservoir 23. In the low-pressure reservoir 23, a 2-port 2-position normally-closed electromagnetic shutoff valve 24 that can be connected, a 2-port 2-position normally-closed electromagnetic shutoff valve 25 that can connect the right rear wheel brake 14 to the low-pressure reservoir 23. Brake fluid of a constant volume damper chamber 26 and orifice 27
Through the electromagnetic shutoff valves 19 and 20 and the master cylinder 1
2 and a plunger type pump 28 as a positive displacement pump driven by an electric motor.

The actuator 18 is a normally open type electromagnetic shut-off valve 29 of two ports and two positions capable of shutting off the right front wheel brake 16 from the other pressure chamber of the master cylinder 12 and the left rear wheel brake 17 at the other pressure of the master cylinder 12. 2 port 2 position normally open type electromagnetic shutoff valve 30 capable of shutting off from the chamber,
The check valves 31 and 32, which are arranged in parallel with the electromagnetic cutoff valves 29 and 30 and allow only the brake fluid flow from the wheel brake side to the master cylinder side, and the right front wheel brake 16 are provided in a single low pressure reservoir 33. In the low-pressure reservoir 33, the normally-closed electromagnetic shut-off valve 34 of the 2-port 2-position that can be connected, the normally-closed electromagnetic shut-off valve 35 of the 2-port 2-position that can connect the left rear wheel brake 17 to the low-pressure reservoir 33. The brake fluid of the damper chamber 36 and the orifice 37 of a constant volume.
Through the electromagnetic shut-off valves 29, 30 and the master cylinder 1
2 and a plunger pump 38 driven by an electric motor, which pumps the fluid to a hydraulic pressure path.

A single electric motor 39 drives both plunger pumps 28,38.

Solenoid shutoff valves 19, 20, 24, 25, 2
Reference numerals 9, 30, 34 and 35 constitute hydraulic pressure control valves.

In FIG. 1, the electromagnetic shutoff valves 19, 20, 2 are shown.
4, 25, 29, 30, 34, 35 and the electric motor 39 are shown in FIG.
The electronic control unit 110 shown in FIG. 4 is electrically operated so as to avoid the locking of the wheels according to the behavior of the wheels during vehicle braking. As is well known, the electronic control unit 110 detects the behavior of each wheel by a signal from a rotation sensor mounted on each wheel, determines the necessity of reducing or increasing the brake fluid pressure of each wheel brake, and electromagnetically shuts off. Operate the valve and motor 39. When the vehicle is running, the electromagnetic shutoff valves 19, 20, 24, 25, 2
Nos. 9, 30, 34 and 35 are not activated and occupy the positions shown in FIG. 1, and the electric motor 39 is not activated.

When the driver applies a brake operating force to the brake pedal 10 to brake the running vehicle,
Brake fluid is pumped from one pressure chamber of the master cylinder 12 to the left front wheel brake 13 and the right rear wheel brake 14, and from the other pressure chamber of the master cylinder 12 to the right front wheel brake 16 and the left rear wheel brake 17, respectively.
The brake fluid pressure of the wheel brakes 13, 14, 16 and 17 is increased to a fluid pressure corresponding to the brake operating force, and the wheel brakes 13, 14, 16 and 17 increase the left front wheel, the right rear wheel, the right front wheel and the left rear wheel. A braking force corresponding to the brake operation force is applied to each.

While the vehicle is being braked, the electronic control unit 110 determines that any one of the front, rear, left, and right wheels, for example, the right rear wheel, tends to lock, and it is necessary to reduce the brake fluid pressure of the right rear wheel brake 14. When the electronic control unit 11
The solenoid shutoff valves 21, 25 and the electric motor 39 are operated by 0. As a result, the right rear wheel brake 14 is disconnected from the one pressure chamber of the master cylinder 12 and connected to the low pressure reservoir 23, and the brake fluid of the right rear wheel brake 14 flows out to the low pressure reservoir 23, whereby the brake of the same wheel brake 14 is released. The liquid pressure is suddenly reduced. Low pressure reservoir 23
The brake fluid that has flowed into the cylinder is returned to the master cylinder 12 side through the damper chamber 26 and the orifice 27 by the plunger pump 28 driven by the electric motor 39. At that time, the discharge pulsation of the plunger pump is attenuated in the damper chamber 26 and the orifice 27. To be done. When the electronic control unit 110 continues to operate the electromagnetic cutoff valve 20 and simultaneously simultaneously releases and operates the electromagnetic cutoff valve 25 in a predetermined cycle, the brake fluid of the left rear wheel brake 14 is pulsed to the low pressure reservoir 2.
3, the brake fluid pressure of the wheel brake 14 is gradually reduced in a stepwise manner. The electronic control unit 110 determines that the locking tendency of the rear right wheel has disappeared, and the electromagnetic shutoff valve 20,
When the operation of 25 is released, the outflow of the brake fluid from the right rear wheel brake 14 to the low pressure reservoir 23 is stopped, and the brake fluid on the master cylinder 12 side is pressure-fed to the right rear wheel brake 14 through the electromagnetic cutoff valve 20. Brake 1
The brake fluid pressure of 4 is suddenly increased. Electronic control unit 1
When it is determined that 10 is a sign that the right rear wheel will tend to lock, and the operation and release of the electromagnetic cutoff valve 20 are repeated in a predetermined cycle, the brake fluid on the master cylinder 12 side flows into the right rear wheel brake 14 in a pulsed manner. The brake fluid pressure of the wheel brake 14 is gradually increased in a stepwise manner.

The electric motor 39 is not stopped until the anti-lock control for all wheels is completed.

When the electronic control unit 110 also tends to lock the left rear wheel during vehicle braking and it is determined that the brake fluid pressure of the left rear wheel brake 17 needs to be reduced, the electronic control unit 110 causes the electromagnetic shutoff valve 30, 35 is activated. As a result, the left rear wheel brake 17 is disconnected from the other pressure chamber of the master cylinder 12, and the low pressure reservoir 33
And the brake fluid of the left rear wheel brake 17 flows out to the low pressure reservoir 33.
The brake fluid pressure is suddenly reduced. The brake fluid that has flowed into the low-pressure reservoir 33 is driven by the electric motor 39 by the plunger pump 38 and the damper chamber 36 and the orifice 37.
To the master cylinder 12 side through the discharge pulsation of the plunger type pump, and the damper chamber 36 and the orifice 3
Attenuated with 7. When the electronic control unit 110 continues to operate the electromagnetic cutoff valve 30 and simultaneously releases and operates the electromagnetic cutoff valve 35 in a predetermined cycle, the brake fluid of the right rear wheel brake 17 flows into the low pressure reservoir 33 in a pulsed manner. The brake fluid pressure of the wheel brake 17 is gradually reduced in a stepwise manner. The electronic control unit 110 determines that the lock tendency of the left rear wheel has been resolved, and the electromagnetic shutoff valves 30, 35
Release of the brake fluid from the left rear wheel brake 17 to the low pressure reservoir 33, the brake fluid on the master cylinder 12 side is pressure-fed to the left rear wheel brake 17 through the electromagnetic cutoff valve 30 and the right rear wheel brake. The brake fluid pressure of 17 is rapidly increased. Electronic control unit 110
Is a sign that the left rear wheel tends to lock, and the operation and release of the electromagnetic cutoff valve 30 are repeated in a predetermined cycle,
The brake fluid on the master cylinder 12 side flows into the left rear wheel brake 17 in a pulsed manner, and the brake fluid pressure of the wheel brake 17 is gradually increased in a stepwise manner.

The brake fluid pressures of the front left wheel brake 13 and the front right wheel brake 16 are also controlled by the electronic control unit 1.
The electromagnetic shutoff valves 19, 24, 29, and 34 are activated and deactivated by 10 to rapidly reduce pressure, gradually reduce pressure, rapidly increase pressure, and gradually increase pressure.

2 to 4 show the assembly of the actuators 15 and 18 shown in FIG. 1, the electric motor 39 and the electronic control unit 110 (brake hydraulic pressure control actuator). 2 is a partially sectional front view of the assembly, FIG. 3 is a sectional view taken along the line GG in FIG. 2, and FIG. 4 is a partially omitted sectional view taken along the line HH in FIG.

As shown in FIG. 2, an actuator body (hereinafter simply referred to as a body) 1 having rubber mounts 101 for mounting on a vehicle on both left and right sides of a lower portion thereof.
02 is made of an aluminum alloy, and is connected to the wheel brakes 13, 14, 16 and 1 from the master cylinder 12.
7, that is, the hydraulic pressure path from the point A in FIG. 1 to the points B and C, and the hydraulic path from the point D to the points E and F in FIG. Form. Six ports corresponding to the points indicated by points A to F in FIG. 1 are arranged on the upper portion of the body 102.

An electric motor 39 is watertightly joined to the right side surface of the body 102, and plunger type pumps 28 and 38 are incorporated inside the body 102. These plunger type pumps are arranged opposite to a drive shaft with an eccentric cam coaxially arranged with the output shaft of the electric motor 39 and a radial direction of the eccentric cam of the drive shaft, and reciprocate by the rotation of the drive shaft.
One plunger (which reciprocates in the direction perpendicular to the paper surface in FIG. 2), a pump chamber whose volume changes due to the reciprocating motion of these plungers, and a pair of suction valve and discharge valve attached to each pump chamber.

In FIG. 2, the plug 103 at the center of the body 102 forms the damper chamber 26 in the body 102, and the plug forming the damper chamber 36 in the body 102 appears on the rear surface of the body 102. Is.

As shown in FIG. 3, on the lower surface of the body 102, the pistons forming the low pressure reservoirs 23 and 33 and the plugs 104 and 105 attached to the body 102 after the springs for biasing these pistons are fitted are shown. .

On the left side surface of the body 102, the electromagnetic shutoff valve 1
9, 20, 24, 25, 29, 30, 34, and 35 electromagnetic drive units 19a, 20a, 24a, 25a, 29a,
30a, 34a and 35a and a cover 106 covering them are attached.

Solenoid shutoff valves 19, 20, 24, 25, 2
The valve portions of 9, 30, 34 and 35 (driven by an electromagnetic drive portion) are arranged inside the body 102.

The cover 106 includes electromagnetic drive units 19a, 20.
a, 24a, 25a, 29a, 30a, 34a and 3
It is composed of a frame body 106A and a lid body 106B surrounding the 5a. Both the frame body 106A and the lid body 106B are made of an electrically insulating synthetic resin.
6A is a screw 1 on the body 102 with the packing 107 interposed.
09, and the lid body 106B is joined to the frame body 106A by the six locking portions 106C with the packing 108 interposed therebetween.

An electronic control unit 110 is arranged inside the cover 106. This electronic control unit 110
Is an assembly of a large number of electronic components 110C on an FPC of a board formed by adhering an FPC (flexible printed circuit board) 110B to one surface (left side surface in FIG. 2) of a plate member 110A made of an aluminum alloy. The plate 110A of the substrate is in thermal contact with the heat transfer plate 111 on the surface opposite to the surface to which the FPC is bonded. The heat transfer plate 111 is made of an aluminum alloy and has two screws 1
It is attached to the frame body 106A by 12 so as to be slightly displaceable (slightly displaceable in the vertical direction in FIG. 4), and is urged toward the body 102 by the wave washer inserted between the frame body and the screw 112. It has four leg portions 111a which penetrate the holes of 106A and are brought into thermal contact with the body 102.

The frame 106A has a connector portion 106Aa,
106Ab is formed, and the connector portion 106A is formed.
Twenty-six connector terminals 113 for electrically connecting to a wheel rotation sensor or the like are press-fitted into the twenty-six terminal insertion holes formed in a. These connector terminals 113 are electrically connected directly to the FPC of the electronic control unit 110.

The frame 106A includes an electronic control unit 11
0, the electric motor 39, and four electric conductors 114A, 114B for electrically connecting the battery (not shown),
114C and 114D are insert-formed. One end of each of the conductors 114A, 114B and 114D has a frame 106A.
Is formed as a connector terminal located on the battery connector portion 106Ab, and the other ends of the conductors 114A and 114D are directly electrically connected to the FPC 110B of the electronic control unit 110. The other end of the conductor 114B is electrically connected to the negative terminal of the electric motor 39.
02 is electrically connected to the conductor 118 guided to the left side of the body through the through hole 120, and both ends of the conductor 114C are electrically connected to the positive side terminal of the electric motor 39. Conductor 119 led out to the left side of the body and FPC 11 of electronic control unit 110
It is electrically connected to 0B.

Solenoid shutoff valves 19, 20, 24, 25, 2
9, 30, 34, 35 electromagnetic drive units 19a, 20a, 2
The terminals 4a, 25a, 29a, 30a, 34a, 35a are also directly electrically connected to the FPC 110B of the electronic control unit 110. The plate member 110A of the electronic control unit 110 and the terminal penetrating portion of the heat transfer plate 111 have an escape hole for preventing a short circuit.

Although not shown in the drawing, a capacitor for preventing motor noise is electrically connected to the FPC.

Reference numeral 121 in FIG. 2 indicates a breathing hole formed in the body 102 for allowing the interior space of the cover 106 to breathe.

In the structure shown in FIGS. 2 to 4, the heat generated by the electronic component 110C of the electronic control unit 110 is conducted from the plate member 110A of the substrate to the actuator body 102 via the heat transfer plate 111, and the actuator body 102 is driven. Heat is radiated from the body 102 into the atmosphere. Since the actuator body 102 has a surface area much larger than that of the top of the cover 106, the heat generated by the electronic component 110C of the electronic control unit 110 can be sufficiently radiated into the atmosphere.

The terminals of the electric motor 39 are electrically connected to the electronic control unit 110 and the connector terminals via the conductors 118 and 119 arranged inside the actuator body 102. Since it is covered with a lid, a harness and a resistor are unnecessary, and the size and cost can be reduced. Further, the terminals and conductors 114 of the electromagnetic drive unit and the electronic control unit 110 and the connector terminals can be connected. Therefore, it is possible to reduce the labor required for the electrical connection.

The metal plate 110A and the FPC 11 in which the substrate of the electronic control unit 110 is in thermal contact with the heat transfer plate
And 0B, the heat generated by the electronic component 110C of the electronic control unit 110 can effectively transfer heat to the heat transfer plate 111.
And the heat dissipation is extremely good, and since the difference in thermal expansion between the substrate and the heat transfer plate 111 is small, the load on the electrical connection portion is reduced and the durability is improved.

The specific construction of the hydraulic pressure control valve for controlling the inflow / outflow of the brake fluid to / from the wheel brakes is not limited to the construction of the above-mentioned embodiment, but can be appropriately changed if necessary. . Further, as described in JP-A-64-47644, it is also applicable to a configuration in which re-increase of brake fluid pressure is performed by supplying pressurized brake fluid from power fluid pressure.

[0043]

As described above, the vehicle brake fluid pressure control actuator according to the invention of this application has the actuator body forming a part of the fluid pressure path from the brake master cylinder of the vehicle to the wheel brakes. With a vehicle brake fluid pressure control actuator that is equipped with an electromagnetically operated hydraulic pressure control valve that controls the flow of brake fluid into and out of the wheel brakes, and an electronic control unit that electrically operates this hydraulic pressure control valve. Therefore, the heat generated by the electronic components forming the electronic control unit can be sufficiently radiated, and the size can be reduced as compared with the conventional device.

Further, the vehicle brake fluid pressure control actuator according to the invention of this application applies the brake fluid to the wheel brakes to the actuator body forming a part of the fluid pressure path from the brake master cylinder of the vehicle to the wheel brakes. An electromagnetically operated hydraulic pressure control valve that controls the inflow and outflow, a low pressure reservoir that stores the brake fluid that has flowed out of the wheel brake by this hydraulic pressure control valve, and the brake fluid in this low pressure reservoir is returned to the hydraulic pressure path. A brake hydraulic pressure control actuator for a vehicle, comprising a positive displacement pump, an electric motor for driving the positive displacement pump, and an electronic control unit for operating the electric motor and the hydraulic pressure control valve, the electronic control unit comprising: It can sufficiently dissipate the heat generated by the electronic components that it composes, can be made smaller than conventional devices, and can be used as an electronic control unit and power supply. Electrical connection of the machine and the fluid pressure control valves are those that can be achieved at low cost.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a hydraulic path of a first embodiment of the invention of this application.

FIG. 2 is a partially cutaway front view of the embodiment of the brake fluid pressure control actuator shown in FIG.

3 is a cross-sectional view taken along the line GG in FIG.

4 is a partially omitted cross-sectional view taken along the line HH in FIG.

[Explanation of symbols]

12 ... Master cylinder 13 ... Left front wheel brake 14 ... Right rear wheel brake 15 ... Actuator 16 ... Right front wheel brake 17 ... Left rear wheel brake 18 ... Actuator 19, 20, 24, 25, 29, 30, 34, 35 ...
.Electromagnetic shut-off valves 19a, 20a, 24a, 25a, 29a, 30a, 3 constituting a hydraulic control valve
4a, 35a ... Electromagnetic drive part of electromagnetic shutoff valve 23, 33 ... Low pressure reservoir 28, 38 ... Plunger pump 39 ... Electric motor 102 ... Actuator body 106 ... Cover 106A ... Frame 106Aa, 106Ab ... Connector part 106B ... Lid 110 ... Electronic control unit 113 ... Connector terminal 114A, 114B, 114C, 114D ... Conductor

Claims (3)

[Claims] 1. A hydraulic fluid passage extending from a brake master cylinder of a vehicle to a wheel brake, wherein an actuator body forming a part of the fluid pressure passage is provided with a brake fluid for the wheel brake. An electromagnetically operated hydraulic pressure control valve that controls the inflow and outflow, and an electronic control unit that electrically operates this hydraulic pressure control valve are assembled in a vehicle brake hydraulic pressure control actuator, which is made of metal. On one side surface of the actuator body, electromagnetic drive parts of a plurality of electromagnetic valves constituting the hydraulic control valve are arranged in parallel, and a cover for covering these electromagnetic drive parts is attached in a watertight manner. In the inner space of the cover, a metal heat transfer plate that straddles the electromagnetic drive unit is attached in a state of being in thermal contact with the actuator body. , The electronic control unit the brake fluid pressure control actuator for a vehicle substrate is in thermal contact with the heat transfer plate. 2. The vehicle brake fluid pressure control actuator according to claim 1, wherein the actuator body has a low-pressure reservoir that stores brake fluid that has flowed out of the wheel brakes by the fluid pressure control valve. A positive displacement pump for returning the brake fluid in the low pressure reservoir to the hydraulic pressure passage and an electric motor for driving the positive displacement pump are assembled, and the cover is provided with various sensors such as a battery and a wheel rotation sensor. A connector terminal for electrically connecting and a connection terminal for electrically connecting to the terminals of the electronic control unit and the electric motor are provided, and the plurality of electromagnetic drive units are surrounded, and the actuator body is watertight. And a lid body that is watertightly attached to the frame body and covers the electronic control unit. The electric motor is attached to the other side surface of the actuator body that opposes the one side surface, and a pair of terminals of the electric motor penetrate through a pair of through holes formed in the actuator body. Connected to the corresponding connection terminal in the connection terminal by the conductor of, the electronic control unit is directly electrically connected to the corresponding terminal in the connector terminal and the corresponding terminal in the connection terminal. The brake fluid pressure control actuator for a vehicle, wherein the heat transfer plate has a leg portion that penetrates the frame body and is in thermal contact with the actuator body. 3. The vehicle brake fluid pressure control actuator according to claim 1, wherein a substrate of the electronic control unit is formed of metal, and the one surface of the substrate is connected to the heat transfer plate. A vehicle brake fluid pressure control actuator comprising a plate in thermal contact with an FPC adhered to the other surface of the plate.