JP7232778B2 - Brake fluid pressure controller - Google Patents

Description

The present invention relates to a brake fluid pressure control device.

2. Description of the Related Art Conventionally, there has been known a brake fluid pressure control device that performs brake control by controlling the fluid pressure of brake fluid supplied to a braking portion with a hydraulic circuit. The brake fluid pressure control device includes a fluid pressure unit and an electronic control unit (ECU).

The hydraulic unit includes a control valve that can be freely opened and closed, a pump element that operates in conjunction with the control valve, a motor that drives the pump element, and the like. These control valves, pump elements, and motors are controlled by the ECU to operate, and the braking force generated in the wheels is controlled by increasing or decreasing the hydraulic pressure in the brake hydraulic circuit (see, for example, Patent Document 1). .

Japanese Unexamined Patent Application Publication No. 2016-203880

Here, in the conventional brake hydraulic pressure control device, all the control valves are mounted on the side of the housing of the hydraulic unit opposite to the side on which the motor is mounted. An ECU electrically connected to the control valve is arranged on the side where the control valve is mounted. The areas of the mutually facing side surfaces on which the motors and control valves are mounted are designed to be relatively large so that at least a plurality of control valves can be arranged.

In addition to the control valve, pump element, and motor, the hydraulic unit is also provided with components such as pressure sensors and accumulators. Since the motor and the control valve are mounted on opposite sides of the housing, components other than the motor and the control valve are mounted on four sides that are vertically continuous from the two sides on which the motor and the control valve are mounted. will be For this reason, there is a limit to reducing the distance between the mutually facing sides on which the motor and the control valve are mounted, and it is difficult to reduce the size of the housing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a brake hydraulic pressure control device capable of reducing the size and weight of the brake hydraulic pressure control device by miniaturizing the housing of the hydraulic unit.

According to one aspect of the present invention, there is provided a brake hydraulic control device for controlling hydraulic pressure in a brake hydraulic circuit, comprising a housing, a motor mounted on the housing, and a motor mounted on the housing and flowing through the brake hydraulic circuit. a plurality of control valves for controlling the flow of the brake fluid, the plurality of control valves being mounted separately on first and second surfaces facing each other in the housing, and the housing being provided with electrical wiring. A brake fluid pressure control device is provided having at least one through-hole provided with both ends of the at least one through-hole opening into the first surface and the second surface .

As described above, according to the present invention, the size and weight of the brake hydraulic pressure control device can be reduced by downsizing the housing of the hydraulic unit.

FIG. 3 is a circuit diagram showing a configuration example of a brake hydraulic circuit; 1 is a perspective view showing a brake fluid pressure control device according to an embodiment of the invention; FIG. It is a perspective view which shows the structural example of the housing which concerns on the same embodiment. It is a side view which shows the structural example of the housing which concerns on the same embodiment. It is the perspective view which looked at the brake fluid pressure control apparatus which concerns on the same embodiment from the lower surface side. It is a sectional view of a brake fluid pressure control device concerning the embodiment. It is a sectional view of a brake fluid pressure control device concerning the embodiment. FIG. 11 is a cross-sectional view of a brake fluid pressure control device according to a modification;

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

<1. Brake hydraulic circuit>
A brake hydraulic circuit 1 to which a brake fluid pressure control device 10 according to the present embodiment can be applied will be briefly described with reference to FIG.

The brake hydraulic circuit 1 shown in FIG. 1 is applied to a brake system that amplifies the force applied by the driver to the brake pedal and transmits it to the wheel cylinder without using a booster. The brake system shown in FIG. 1 is a brake system for four-wheel vehicles.

The brake hydraulic pressure control device 10 includes a first hydraulic circuit 28 and a second hydraulic circuit 30 having the same configuration. Brake fluid is supplied from the master cylinder 14 to the first hydraulic circuit 28 and the second hydraulic circuit 30 .

The brake hydraulic circuit 1 is a so-called X-type hydraulic circuit that controls the hydraulic pressure of a set of one front wheel and one rear wheel, which are located diagonally on the vehicle, by means of a first hydraulic circuit 28 and a second hydraulic circuit 30, respectively. It is configured in a piping system.

The brake system is not limited to the X-type piping system. Also, the brake system is not limited to a brake system for four-wheeled vehicles, and may be a brake system for two-wheeled vehicles or other vehicles.

The second hydraulic circuit 30 has a configuration similar to that of the first hydraulic circuit 28 . The first hydraulic circuit 28 will be described below, and the description of the second hydraulic circuit 30 will be omitted.

The first hydraulic circuit 28 comprises a plurality of control valves. The control valves include a normally open linearly controllable circuit control valve 36a, a normally closed intake control valve 34a that is ON/OFF controlled, normally open linearly controllable pressure increase valves 58aa and 58ba, and a normally closed type. includes pressure reducing valves 54aa and 54ba that are on/off controlled by . The driving of these control valves is controlled by an electronic control unit (ECU) (not shown).

The first hydraulic circuit 28 comprises a pumping element 44a driven by a motor 96. As shown in FIG. The first hydraulic circuit 28 also includes an accumulator 71a and a damper 73a.

The pump element 44a is driven by the motor 96 to discharge brake fluid. Driving of the motor 96 is controlled by an ECU (not shown). The number of pump elements 44a provided in the first hydraulic circuit 28 is not limited to one.

A first pressure sensor 24 is provided in a conduit communicating with the master cylinder 14 . A first pressure sensor 24 detects the pressure within the master cylinder 14 .

A second pressure sensor 26a is provided in a conduit communicating with the wheel cylinder 38a of the hydraulic brake 22a for the right front wheel. The second pressure sensor 26a detects wheel cylinder pressure.

The second pressure sensor 26a may be provided in a conduit communicating with the wheel cylinder 38b of the hydraulic brake 22b for the left rear wheel.

The second hydraulic circuit 30 controls the hydraulic brake 22c for the left front wheel and the hydraulic brake 22d for the right rear wheel. The second hydraulic circuit 30 replaces the wheel cylinder 38a of the hydraulic brake 22a of the right front wheel in the description of the first hydraulic circuit 28 with the wheel cylinder 38c of the hydraulic brake 22c of the left front wheel, It is configured in the same manner as the first hydraulic circuit 28 except that the wheel cylinder 38b of the pressure brake 22b is replaced with the wheel cylinder 38d of the hydraulic brake 22d for the right rear wheel.

<2. Brake fluid pressure controller>
(2-1. Overall configuration)
The overall configuration of the brake fluid pressure control device 10 according to the present embodiment will be described with reference to FIG.

FIG. 2 is a perspective view of the brake fluid pressure control device 10. As shown in FIG. The illustrated brake hydraulic pressure control device 10 is a device for controlling the braking force of each wheel of a four-wheeled vehicle. The brake hydraulic pressure control device 10 has two hydraulic circuits.

The brake fluid pressure control device 10 is not limited to a device for four-wheeled vehicles, and may be a device for two-wheeled vehicles or other vehicles.

The brake hydraulic pressure control device 10 includes a hydraulic pressure unit 20, a first ECU 40a and a second ECU 40b. The hydraulic unit 20 has a housing 130 .

A motor 96 is attached to a side surface (hereinafter also referred to as “upper surface”) 130 a of the housing 130 . The motor 96 is mounted so that the motor shaft 96a faces the inside of the housing 130. As shown in FIG.

A first ECU 40a is attached to a side surface (hereinafter also referred to as a “first surface”) 130b that continues vertically from an upper surface 130a of the housing 130. As shown in FIG. A second ECU 40b is attached to a side surface (hereinafter also referred to as a “second surface”) 130c that is vertically continuous from an upper surface 130a of the housing 130 and faces the first surface 130b.

(2-2. Configuration of housing)
3 and 4 are explanatory diagrams showing a configuration example of the housing 130 of the hydraulic unit 20 of the brake hydraulic pressure control device 10 according to this embodiment. 3 is a perspective view showing the internal structure of the housing 130 with solid lines, and FIG. 4 is a side view of the housing 130 of FIG. 3 as seen from the rear side.

The housing 130 is made of metal and has a plurality of connections to which a motor, two pump elements, a plurality of control valves, an accumulator, a pressure sensor, liquid lines, etc. are mounted or connected. Each connecting portion is a cylindrical recess formed in the housing 130 by, for example, drilling.

Specifically, the housing 130 has a motor connection groove 130aa on the top surface 130a.

Further, the housing 130 is mounted with connecting portions 211, 215 to which the pressure increasing valves 58aa, 58ba of the plurality of control valves provided in the first hydraulic circuit 28 shown in FIG. 1 are mounted, and pressure reducing valves 54aa, 54ba. It has connection portions 209 and 213, a connection portion 217 to which the suction control valve 34a is attached, and a connection portion 219 to which the circuit control valve 36a is attached.

Further, the housing 130 is equipped with connecting portions 203 and 223 to which the pressure increasing valves 58ab and 58bb of the plurality of control valves provided in the second hydraulic circuit 30 shown in FIG. It has connection portions 201 and 221, a connection portion 205 to which the suction control valve 34b is attached, and a connection portion 207 to which the circuit control valve 36b is attached.

The housing 130 also has connections 225, 227, 229 to which the first pressure sensor 24 and the second pressure sensors 26a, 26b shown in FIG. 1 are mounted. The housing 130 also has connection portions 247 and 249 for fixing the first ECU 40a and the second ECU 40b.

Connection portions 213 , 215 , 217 , 219 , 221 , 223 , 225 , 227 and 229 of these connection portions are formed on first surface 130 b of housing 130 . Connection portions 201, 203, 205, 207, 209, and 211 are formed on the second surface 130c. Both ends of the connection portions 247 and 249 are through holes that open to the first surface 130b and the second surface 130c.

The housing 130 also has bores 231, 233 in which the accumulators 71a, 71b provided in the first hydraulic circuit 28 and the second hydraulic circuit 30 shown in FIG. 1 are assembled. The housing 130 has connection ports 237, 243 to which liquid pipes connected to the master cylinder 14 are connected, and connection ports 235, 239, 241, 245 to which liquid pipes connected to the wheel cylinders 38a to 38d of each wheel are connected. have

The housing 130 also has pump receiving holes 131a and 131b in which the pump elements 44a and 44b provided in the first hydraulic circuit 28 and the second hydraulic circuit 30 are mounted.

These pump housing holes 131a, 131b, bores 231, 233 and connection ports 235, 237, 239, 241, 243, 245 are formed on a side surface (hereinafter also referred to as "lower surface") 130d facing the upper surface 130a of the housing 130. ing.

Further, the housing 130 is formed with an internal flow path through which the brake fluid flows.

As described above, in the brake hydraulic pressure control device 10 according to the present embodiment, the connecting portions for mounting a plurality of control valves are divided into the first surface 130b and the second surface 130c facing each other of the housing 130 of the hydraulic unit 20. is provided.

Specifically, connecting portions 213, 215, 217, 219, 221, 223 to which a plurality of control valves are mounted are formed on the first surface 130b. Connection portions 201, 203, 205, 207, 209, and 211 to which a plurality of control valves are mounted are formed on the second surface 130c facing the first surface 130b.

(2-3. Specific Configuration of Brake Hydraulic Pressure Control Device)
5 to 7 in addition to FIG. 2, the configuration of the brake fluid pressure control device 10 will be specifically described.

FIG. 5 is a perspective view of the brake fluid pressure control device 10 of FIG. 2 as seen from below. 6 is a sectional view of the YZ plane including the axis of the motor shaft 96a of the brake fluid pressure control device 10 shown in FIG. 2, and FIG. 7 is a sectional view of the XZ plane including the axis of the motor shaft 96a. be.

Note that the accumulators 71a and 71b are omitted from FIG.

A pressure reducing valve 54ba, a pressure increasing valve 58ba, an intake control valve 34a and circuit control valves among the plurality of control valves provided in the first hydraulic circuit 28 are mounted on the first surface 130b of the housing 130 to which the first ECU 40a is attached. A valve 36a is installed.

A pressure reducing valve 54ab and a pressure increasing valve 58ab among the plurality of control valves provided in the second hydraulic circuit 30 are mounted on the first surface 130b. The first pressure sensor 24 and the second pressure sensors 26a and 26b shown in FIG. 1 are mounted on the first surface 130b.

FIG. 7 shows a plurality of control valves mounted on the first surface 130b, the pressure reducing valve 54ab, the pressure increasing valve 58ab and the second pressure sensor among the first pressure sensor 24 and the second pressure sensors 26a and 26b. Only 26b appears.

The first ECU 40 a has a cover 41 a , a first circuit board 43 a and an external connector 49 . The first circuit board 43a is fixed inside the cover 41a. An electric circuit is formed on the first circuit board 43a for controlling the driving of the pressure reducing valves 54ab and 54ba, the pressure increasing valves 58ab and 58ba, the intake control valve 34a and the circuit control valve 36a mounted on the first surface 130b. ing.

The first circuit board 43a has a plurality of actuators for electrically connecting the pressure reducing valves 54ab and 54ba, the pressure increasing valves 58ab and 58ba, the intake control valve 34a and the circuit control valve 36a to the first circuit board 43a. An internal connector 45a is connected.

The external connector 49 has terminals formed on one side surface of the cover 41a and electrically connected to the first circuit board 43a. The external connector 49 electrically connects the first circuit board 43a to the control system of the vehicle. As a result, a driving instruction signal is input from the vehicle-side control system to the first circuit board 43a via the external connector 49. As shown in FIG.

A pressure reducing valve 54aa and a pressure increasing valve 58aa among the plurality of control valves provided in the first hydraulic circuit 28 are mounted on the second surface 130c of the housing 130 to which the second ECU 40b is attached. A pressure reducing valve 54bb, a pressure increasing valve 58bb, an intake control valve 34b, and a circuit control valve 36b among the plurality of control valves provided in the second hydraulic circuit 30 are mounted on the second surface 130c.

7 shows only the suction control valve 34b and the circuit control valve 36b among the plurality of control valves mounted on the second surface 130c.

The second ECU 40b has a cover 41b and a second circuit board 43b. The second circuit board 43b is fixed inside the cover 41b. An electric circuit is formed on the second circuit board 43b to control the driving of the pressure reducing valves 54aa and 54bb, the pressure increasing valves 58aa and 58bb, the intake control valve 34b and the circuit control valve 36b mounted on the second surface 130c. ing.

The second circuit board 43b has a plurality of actuators for electrically connecting the pressure reducing valves 54aa and 54bb, the pressure increasing valves 58aa and 58bb, the suction control valve 34b and the circuit control valve 36b to the second circuit board 43b. An internal connector 45b is connected.

The second circuit board 43b is electrically connected to the first circuit board 43a by an electric wiring 47. As shown in FIG. A drive instruction signal is input to the second circuit board 43b through the external connector 49 and the first circuit board 43a.

The electric wiring 47 connecting the first circuit board 43a and the second circuit board 43b is connected to at least one of connection portions 247 and 249 for fixing the first ECU 40a and the second ECU 40b formed in the housing 130, for example. may be wired using This eliminates the need to secure a space for forming a hole for wiring in the housing 130, thereby suppressing an increase in the size of the housing 130. FIG.

A motor 96 is mounted on the top surface 130a of the housing 130 which is vertically continuous with both the first surface 130b and the second surface 130c. The width W1 of the upper surface 130a in the X-axis direction is smaller than the width W2 of the motor 96 in the X-axis direction (see FIG. 7).

Connection ports 235, 237, 239, 241, 243, and 245 to which liquid pipes leading to the master cylinder 14 or the wheel cylinders 38a to 38d of the wheels are connected are formed on the lower surface 130d facing the upper surface 130a of the housing 130. .

Two pump elements 44a, 44b and two accumulators 71a, 71b are assembled to the lower surface 130d of the housing 130. As shown in FIG. The two pump elements 44a, 44b each have a piston 150 which abuts a swash plate 125 which is driven to rotate by the motor 96. As shown in FIG.

The two pump elements 44a and 44b are driven by the rotation of the swash plate 125, and the pistons 150 reciprocate to suck and discharge the brake fluid. The piston 150 reciprocates along the axial direction of the motor shaft 96a.

As described above, in the brake fluid pressure control device 10 according to the present embodiment, a plurality of control valves are mounted separately on the first surface 130b and the second surface 130c facing each other. Therefore, the motor 96, the pump elements 44a, 44b, the first pressure sensor 24, the second pressure sensors 26a, 26b, the accumulators 71a, 71b, etc. are mounted on the same surface, compared to the case where the plurality of control valves are all mounted on the same surface. The degree of freedom in arranging components is increased.

For example, in the brake fluid pressure control device 10 according to the present embodiment, the motor 96 is mounted on the upper surface 130a that is vertically continuous from the first surface 130b and the second surface 130c. Two pump elements 44a and 44b are attached to a lower surface 130d that is vertically continuous from the first surface 130b and the second surface 130c and faces the upper surface 130a.

The pistons 150 of the two pump elements 44a, 44b are configured to reciprocate parallel to the motor shaft 96a, and the two pump elements 44a, 44b are arranged so that their longitudinal directions extend in the Z-axis direction along the motor shaft 96a. ing.

Therefore, it is possible to dispose the two pump elements 44a and 44b on the circumference around the motor shaft 96a. As a result, the width W1 of the housing 130 in the X-axis direction can be made smaller than the width W2 of the motor 96 in the X-axis direction.

Even when the number of pump elements is increased, the housing 130 can be miniaturized because a plurality of pump elements can be arranged on the circumference around the motor shaft 96a.

Connection ports 235, 237, 239, 241, 243, and 245 to which various liquid pipes are connected are all provided on the same lower surface 130d. For this reason, the mountability to a vehicle is improved.

A first circuit board 43a of the first ECU 40a and a second circuit board 43b of the second ECU 40b are connected by electrical wiring 47, and are connected to the vehicle side via an external connector 49 provided on the first ECU 40a. A drive command signal is input from the control system of the . Since the external connector 49 is one, even if the two ECUs, the first ECU 40a and the second ECU 40b, are provided, the mountability on the vehicle is improved.

When the brake fluid pressure control device 10 according to the present embodiment is mounted on a vehicle, the upper surface 130a, the lower surface 130d, the first surface 130b, and the second surface 130c of the housing 130 are provided with two vertically continuous opposed surfaces. Sides 130f, 130g (see FIGS. 2, 5 and 6) may be utilized.

For this reason, for example, by using a bracket having a U-shaped cross section and fixing the two opposing surfaces of the bracket to the side surfaces 130f and 130g of the housing 130 via dampers, respectively, the brake fluid is supplied so as to sandwich the center of gravity of the brake fluid pressure control device 10. A pressure control device 10 can be supported. As a result, the effect of suppressing vibration transmitted to the brake fluid pressure control device 10 is enhanced, and NVH (Noise, Vibration, Harshness) performance can be improved.

Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. It is understood that these also naturally belong to the technical scope of the present invention.

For example, in the brake fluid pressure control device 10 according to the above embodiment, one of the first ECU 40a and the second ECU 40b is provided with an external connector 49, and the first circuit board 43a and the second circuit board 43b are electrically connected. , but the invention is not limited to such an example.

Each of the first ECU 40a and the second ECU 40b may be provided with an external connector so that a drive command signal is input to each ECU from the vehicle-side control system.

In the brake fluid pressure control device 10 according to the above embodiment, the first circuit board 43a and the second circuit board 43b are formed with electric circuits for controlling the driving of the plurality of control valves. Examples are not limiting.

For example, an electric wiring pattern is formed on the first circuit board 43a and the second circuit board 43b, and a drive signal inputted through an external connector is transmitted through the first circuit board 43a and the second circuit board 43b. It may be transmitted to a plurality of control valves.

Also, the brake fluid pressure control device is a circuit for controlling all the control valves mounted on either the first surface 130b or the second surface 130c separately on the first surface 130b and the second surface 130c. A substrate may be provided.

In the brake fluid pressure control device 10 shown in FIG. 8, an ECU 80 having a cover 81a, a circuit board 83 and an external connector 89 is arranged on the first surface 130b. Only the cover 81b is attached to the second surface 130c.

A plurality of control valves mounted on the first surface 130b are electrically connected to the circuit board 83 by an internal connector 85, and a plurality of control valves mounted on the second surface 130c are connected to the circuit board 83 by electrical wiring 87. electrically connected. Drive control of each control valve is performed by the circuit board 83 in accordance with a drive command signal input from the control system on the vehicle side via the external connector 89 .

The electrical wiring 87 may be wired using at least one of the connection portions 247 and 249 formed in the housing 130 as in the case of the above embodiment.

REFERENCE SIGNS LIST 10 Brake hydraulic pressure control device 20 Hydraulic pressure unit 34a, 34b Suction control valve 36a, 36b Circuit control valve 43a First circuit board 43b Second circuit board 44a, 44b Pump element 47 Electric wiring 49 External connector 54aa, 54ab, 54ba, 54bb Pressure reducing valve 58aa, 58ab, 58ba , 58bb... pressure increasing valve, 96... motor, 130... housing, 130b... first surface, 130c... second surface

Claims (5)

A brake hydraulic pressure control device (10) for controlling hydraulic pressure in a brake hydraulic circuit,
a housing (130);
a motor (96) mounted in the housing (130);
A plurality of control valves (34a, 34b, 36a, 36b, 54aa, 54ab, 54ba, 54bb, 58aa, 58ab, 58ba, 58bb),
The plurality of control valves (34a, 34b, 36a, 36b, 54aa, 54ab, 54ba, 54bb, 58aa, 58ab, 58ba, 58bb) have a first surface (130b) and a first surface (130b) facing each other in the housing (130). It is mounted separately on the second surface (130c),
The housing (130) includes:
having at least one through-hole (247, 249) in which an electrical wiring (47) is arranged ;
Both ends of the at least one through hole (247, 249) are open to the first surface (130b) and the second surface (130c),
Brake fluid pressure controller. A first circuit board (43a) is provided on the first surface (130b) to control the control valves (34a, 36a, 54ab, 54ba, 58ab, 58ba) mounted on the first surface (130b). ,
A second circuit board (43b) is provided on the second surface (130c) for controlling the control valves (34b, 36b, 54aa, 54bb, 58aa, 58bb) mounted on the second surface (130c). ,
The first circuit board (43a) and the second circuit board (43b) are electrically connected to each other,
The brake fluid pressure control device according to claim 1, wherein an external connector (49) is connected to either one of the first circuit board (43a) or the second circuit board (43b). A plurality of control valves (34a, 34b, 36a, 36b, 54aa, 54ab, 54ba, 54aa, 54ab, 54ba, 54bb, 58aa, 58ab, 58ba, 58bb) is provided with a circuit board (83). The brake fluid pressure control device (10)
a swash plate (125) that is fixed to the tip of a motor shaft (96a) of the motor (96) and arranged to be inclined with respect to the axial direction of the motor shaft (96a);
a pump element (44) driven by rotation of the motor shaft (96a) and the swash plate (125);
The pump element (44) is
The brake hydraulic pressure control device according to any one of claims 1 to 3, further comprising a piston (150) that reciprocates in parallel with the axial direction of the motor shaft (96a) as the swash plate (125) rotates. . The width (W1) in the predetermined direction of the side surface (130a) of the housing (130) to which the motor (96) is mounted is smaller than the width (W2) of the motor (96) in the predetermined direction. 5. The brake fluid pressure control device according to any one of 4.

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