JP4267432B2 - Brake hydraulic pressure control device - Google Patents

Description

  The present invention relates to a brake fluid pressure control device, and more particularly to a layout configuration of a gear pump.

A conventional brake fluid pressure control device detects a brake pedal stroke or the like, and obtains a braking force based on a pressure accumulated in an accumulator based on the detected result. (For example, refer to Patent Document 1).
JP 2001-526150 A (page 9, FIG. 15).

  However, in the conventional brake fluid pressure control device, all the four wheels are braked by the accumulated pressure of one accumulator, so that it is necessary to store a lot of brake fluid in the accumulator. Here, there are many diaphragm type and piston type accumulators, but if the inflow and outflow of brake fluid are repeated frequently, fatigue of the diaphragm and the piston seal part is promoted, which leads to a decrease in durability of the accumulator.

Further, when the accumulator is eliminated and brake fluid pressure control is performed using one pump motor, it is necessary to enlarge the pump motor in order to cope with a sudden increase in wheel cylinder pressure such as a sudden brake. In addition, when hydraulic control is performed independently for each wheel, it is necessary to add a control valve and control the pump motor according to the high pressure requirement side, which may cause sound vibration deterioration and increase the life of the pump motor. is required. Therefore, it is conceivable that a pump motor is attached to each wheel independently. However, in order to arrange the pump motor in the engine room, it is necessary to consider mountability in the engine room .

The present invention has been made paying attention to the above problems, and in the brake fluid pressure control device, each port is provided above the motor axial direction, and the device is mounted in the engine room by downsizing the device. The purpose is to improve the performance.

In order to achieve the above object, in the present invention, in a brake hydraulic pressure control device including a hydraulic pressure control means for controlling a wheel cylinder pressure provided on each wheel by a gear pump, a housing having an oil passage formed therein, The first and second gear pumps housed in the housing with the same axial direction and different axial positions are provided for each of the gear pumps. A first and a second motor for rotational driving of a gear pump mounted on the same surface of the housing; and a connection port provided in the housing for connecting the oil passage to the outside . Two gear pumps and the first and second motors overlap each other, and the connection port is disposed closer to the end of the housing than the rotation shafts of the first and second motors. And none of, by said structure, said first and second gear pump and said first and second motor becomes a relationship overlap in the vertical direction of the vehicle, the connection port of the first and second motor Of these, the relationship is located above the rotational axis of the motor located at the uppermost position.

Therefore, in the brake fluid pressure control device of the present invention, the connection between the device and piping can be facilitated. In addition, it is possible to reduce the projected area in the vertical direction of the vehicle in the engine room , and to reduce the size of the apparatus .

  Hereinafter, the best mode for realizing the brake fluid pressure control device of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration of the brake fluid pressure GoSo location of this embodiment. In addition, what is mounted in an engine room like a brake fluid pressure control apparatus is normally attached from the upper side or the lower side of the vehicle. At that time, in order to facilitate the installation of the brake fluid pressure control apparatus, as easy as possible to the brake fluid pressure control device connecting operation of the pipe, it is desirable to minimize the projected area of the vehicle vertical direction. Therefore, in order to facilitate the connection work between the brake fluid pressure control device and the pipe, an installation method is adopted in which the mounting position of the ports of the gear pumps 10 and 11 is above the motor shaft and the projected area in the vehicle vertical direction is minimized. It was decided.

  FIG. 1 is a perspective view of the brake fluid pressure control unit according to the first embodiment when viewed from the pump motor side. The brake fluid pressure control unit is composed of pump motors 12 and 13, a housing H, and a control unit C / U, which are arranged so as to be layered. Furthermore, the pump motors 12 and 13 are arranged so as to overlap with the housing H in the vertical direction.

  FIG. 2 is a perspective view of the brake fluid pressure control unit according to the first embodiment when viewed from the control unit C / U side. The control unit C / U has been removed for explanation. The brake hydraulic pressure control unit has a plurality of control valves for increasing and decreasing the hydraulic pressure of the wheel cylinder. Here, the shutoff valves 6 ′ and 7 ′, the inlet valves (proportional valves) 14 ′ and 15 ′, the first outlet valves (proportional valves) 16 ′ and 17 ′, the second outlet valves 18 ′ and 19 ′, the relief valve 21 Each control valve of the “, check valve 22” is housed in a mounting hole (6, 7, 14, 15, 16, 17, 18, 19, 21, 22) formed in the housing H, and the gear pumps 10, 11 These are disposed at positions offset in the horizontal direction with respect to the drive shaft as viewed from the drive shaft side.

  The brake fluid pressure control unit constitutes a hydraulic circuit as shown in FIG. 5 by an attached control valve.

  An outline of the operation will be described with reference to FIG. This circuit is a brake-by-wire control circuit that obtains braking force by driving the gear pumps 10 and 11, which are hydraulic pressure sources, to pressurize the inside of the wheel cylinder in accordance with the driver's brake operation.

  First, when the ignition is turned on by an operation of the driver, the shutoff valves 6 ′ and 7 ′ are energized and shut off. As a result, the communication between the master cylinder M / C and the wheel cylinder W / C is disconnected. When the driver depresses the brake pedal in this state, a drive signal is issued from the control unit to the pump motors 12 and 13 so as to generate a hydraulic pressure corresponding to the pedal stroke. In response to this signal, the pump motors 12 and 13 are rotated, the gear pumps 10 and 11 are driven, hydraulic pressure is supplied to the wheel cylinder W / C, and a pressure increase control is performed to obtain a braking force.

  During this pressure increase, at least one of the first outlet valves 16 ′ and 17 ′ or the second outlet valves 18 ′ and 19 ′ is closed, and the inlet valves 14 ′ and 15 ′ are opened.

  Further, in order to reduce the hydraulic pressure in the wheel cylinder, the hydraulic pressure in the wheel cylinder is returned to the reservoir R by opening the first outlet valves 16 ′ and 17 ′ and the second outlet valves 18 ′ and 19 ′. It has become. In this way, pressure increase and pressure reduction control can be performed. The relief valve 21 ′ is opened when the control circuit becomes higher than the required hydraulic pressure. The check valve 22 'prevents the hydraulic pressure in the wheel cylinder from flowing back to the gear pump side. The hydraulic pressure sensors 23 and 24 are adapted to detect the hydraulic pressure in the wheel cylinder. Also, the left and right hydraulic circuits can be made independent when the isolation valve 20 ′ is closed. As a result, two gear pumps are driven by closing the isolation valve 20 during sudden pressure increase (one gear pump per wheel cylinder), and the gear pump is opened by opening the isolation valve 20 during slow pressure increase. One drive (one gear pump per two wheel cylinders) is also possible.

(Offset arrangement of control valve and brake fluid pressure control device vertical projection area reduction)
Here, the case where each control valve is arrange | positioned in the position facing a driven gear on both sides of the drive shaft of the gear pumps 10 and 11 is demonstrated. First, moving each control valve to one side can simplify the oil passage configuration connected to the port. Further, by combining the control valve mounting surface with, for example, the mounting surfaces of the pump motors 12 and 13 of the housing H, the mounting cover (including the control unit C / U) covering the housing H can be combined into one.

  Each control valve is installed in the mounting hole, and is attached to the housing H by caulking the mounting hole edge. When caulking, a large force acts on the housing H, so if the control valve is also installed on the opposing surface, the control provided on the opposing surface when each control valve is installed on the housing H It is necessary to protect the valve, and equipment for that purpose is required. Therefore, the control valves can be easily attached to the housing H by collecting the control valves on one side, caulking and fixing only from one side, and then fixing the pump motor on the other side.

  Furthermore, the control valves are collectively installed on the left side of the gear pumps 10 and 11 in the drawing, and the gear pumps 10 and 11 are further arranged eccentric to the control valve side with respect to the pump motor drive shaft. As a result, a certain amount of space can be provided on the left side of the gear pumps 10 and 11, and the strength can be ensured while making the brake fluid pressure control unit compact.

FIG. 3 is an example in which the hydraulic circuit shown in FIG.
In FIG. 3, a configuration is required in which the projected area in the vehicle vertical direction of the present application can be made as small as possible while simplifying the oil passage.

Therefore, the master cylinder ports 28 and 29 that are input ports and the wheel cylinder ports 34 and 35 that are output ports are collectively arranged on the upper surface where the vertical projected area of the vehicle is small. As a result, there is an effect that it is difficult for air to accumulate in the brake fluid pressure control device . Further, the control valves are arranged for the left wheel and the right wheel together while being close to the gear pumps 10 and 11.

  Here, since the gear pumps 10 and 11 are arranged in the vertical direction, the left and right control valves are also arranged in the vertical direction.

  At this time, arrange the left wheel I / O port close to the left control valve, and arrange the right wheel I / O port away from the right control valve. It is possible to construct a simple oil passage by effectively using the existing location.

(Port mounting position)
Each of the master cylinder ports 28 and 29, the wheel cylinder ports 34 and 35, and the suction suction port S is provided above the motor shaft that drives at least one of the gear pumps 10 and 11. In performing the connection work between the brake fluid pressure control device and the pipe, the worker usually works from the upper side of the vehicle. At this time, by disposing each port so that the motor is disposed below the connection location, it is possible to minimize the influence of the motor unit during connection work.

  FIG. 4 is a diagram illustrating the position of the brake fluid pressure control unit in the engine room according to the first embodiment. (A) is a case where the pump motors 12 and 13 are arranged in a state perpendicular to the vehicle vertical direction. In this case, the projected area (shaded portion) in the vehicle vertical direction becomes large. Therefore, in this embodiment, as shown in (b), the pump motors 12 and 13 are arranged so as to be superposed in the vertical direction when viewed from the vehicle vertical direction. The projected area (shaded area) in the direction can be made smaller.

  Moreover, about the arrangement | positioning of the pump motors 12 and 13, they arrange | position so that the axial direction of the pump motors 12 and 13 may become the mutually same direction. That is, by aligning the direction of the motor shaft, it is possible to suppress the expansion of the projected area in the vehicle vertical direction by the pump motors 12 and 13 to one direction, and the projected area can be minimized.

As described above, in the brake hydraulic pressure control device including the hydraulic pressure control means for controlling the wheel cylinder pressure provided in each wheel by the gear pumps 10 and 11 and the control valve of the present embodiment, each port has at least one of the ports. Are provided above the motor shaft for driving the gear pumps 10 and 11. In addition, the brake fluid pressure control device in which the control valve is disposed at a position offset in the horizontal direction with respect to the drive shaft when viewed from the drive shaft side of the gear pumps 10 and 11 is fixed to the vehicle.

As a result, when performing the connection work between the pump unit and the piping, the worker normally arranges each port so that the motor is disposed below the connection part when working from the upper side of the vehicle. , Ru can be suppressed to minimize the impact of the motor unit at the time of connection work. Further, it is possible to reduce the projected area in the vehicle vertical direction in the engine room , and the pump unit can be reduced in size.

Further, the pump motors 12 and 13 are arranged so as to be superposed in the vertical direction when viewed from the vertical direction of the vehicle. Thus, the projected area of the vehicle vertical direction, Ru can be further reduced.

Further, the axial directions of the pump motors 12 and 13 are arranged in the same direction. Therefore, by aligning the direction of the motor shaft, the projection area enlarged in the vehicle vertical direction by the pump motors 12 and 13 it is possible to suppress the unidirectional expansion, Ru can be reduced as much as possible the projected area.

It is the perspective view which looked at the brake fluid pressure control unit in Example 1 from the pump motor side. It is a perspective view at the time of seeing the brake fluid pressure control unit of Example 1 from the control unit C / U side. 2 is an example in which an oil passage of the brake fluid pressure control device of Embodiment 1 is formed in a housing H. FIG. It is a figure showing the position of the brake fluid pressure control unit in the engine room in Example 1. 2 is a hydraulic circuit of the brake fluid pressure control unit according to the first embodiment.

Explanation of symbols

S Suction suction port 6 ', 7' Shut-off valve 10, 11 Gear pump 12, 13 Pump motor 14 ', 15' Inlet valve (proportional valve)
16 ', 17' 1st outlet valve (proportional valve)
18 ', 19' Second outlet valve 20 'Isolation valve 21' Relief valve 22 'Check valve 23, 24 Hydraulic sensor 28, 29 Master cylinder port 34, 35 Wheel cylinder port

Claims (2)

In a brake hydraulic pressure control device provided with hydraulic pressure control means for controlling the wheel cylinder pressure provided on each wheel by a gear pump,
A housing having an oil passage formed therein;
First and second gear pumps housed in the housing with the same axial direction and different axial positions;
With respect to the first and second gear pump is provided for each gear pump, and the first and second motor for the gear pump rotary drive mounted on the same surface of the housing,
A connection port provided in the housing for connecting the oil passage and the outside;
Arranging the first and second gear pumps and the first and second motors in an overlapping manner,
The connection port is arranged closer to the end of the housing than the rotation shafts of the first and second motors ;
Due to the above structure, the first and second gear pumps and the first and second motors are overlapped in the vertical direction of the vehicle , and the connection port is located at the uppermost position of the first and second motors. A brake fluid pressure control device having a relationship of being positioned above the rotation shaft of the motor. In the brake fluid pressure control device according to claim 1,
As the hydraulic pressure control means, comprising a control valve for communicating and blocking the oil passage,
The control valve is accommodated in a mounting hole formed in the housing,
The brake fluid pressure control device according to claim 1, wherein the mounting hole is provided in the housing from one side in the drive shaft direction of the gear pump.

Images