JP2001191908A - Brake fluid pressure control device - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] To provide a brake fluid pressure control device capable of eliminating a plug member such as a ball caulking which has been indispensable until now. SOLUTION: First and second holes 410 and 420 for setting first and second switching valves are arranged so as to be orthogonal to the direction of the axis of a pipe connection port 311 to 314 to a wheel cylinder. In addition, when viewed from the openings of the pipe connection ports 311 to 314 for the wheel cylinder, first, the first hole 410 is located, and the second hole 420 is located behind the first hole 410. Thus, the opening and the first and second holes 410, 410 are formed by the processing holes from the opening portions of the pipe connection ports 311 to 314 to the wheel cylinder.
Contact 420 directly. Further, the pipe connection ports 301 and 302 with respect to the master cylinder and the first hole 410 are connected using an oblique hole 810 that is inclined with respect to the axial direction of the first hole 410.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake fluid pressure control device for a vehicle, and more particularly to a technique in which components such as an electromagnetic switching valve, a reservoir, and a pump are integrated into a block-shaped housing.

[0002]

BACKGROUND OF THE INVENTION As brake fluid pressure control technology, generally,
Anti-lock brake control to control locking during braking,
Controls related to the driver's brake operation, such as traction control that controls slip during acceleration of the vehicle or running stability control that eliminates lateral instability of the running vehicle, or brake operation by the driver Various control techniques including irrelevant control are known. In each of these controls, the state of the running vehicle is detected by a sensor such as a wheel speed sensor or a yaw rate sensor, and the brake fluid pressure of the wheel cylinder of the wheel brake is controlled based on the detection signal. The detection signal is
It is well known that a microcomputer-based electronic control unit enters and sends control commands to a brake fluid pressure controller.

[0003] The brake fluid pressure control device is located in the middle of the pipe connecting the master cylinder and the wheel cylinder,
The brake fluid pressure of the wheel cylinder is controlled according to the control command. Such a brake fluid pressure control device usually communicates between a master cylinder and a wheel cylinder,
A first switching valve for shutting off, a reservoir for storing the loosening fluid from the wheel cylinder, a second switching valve for shutting off and communicating between the reservoir and the wheel cylinder, and suctioning and adding the liquid inside the reservoir; And a pumping means for pressure. Each of these components is integrated into a block-shaped housing, and they are connected to each other by a passage inside the housing.

[0004]

SUMMARY OF THE INVENTION For example, Japanese Patent Application Laid-Open No. 4-506
As shown in Japanese Patent Application Laid-Open No. 787 and Japanese Patent Application Laid-Open No. 10-95324, a plug member such as a ball caulking has been indispensable in the housing of the brake fluid pressure control device. The plug member closes the opening of the machining hole with respect to the housing and effectively communicates each component. On the other hand, in order to increase the manufacturing cost of the housing, it is desired to minimize the use of such a plug member. However, the housing has an infinite number of processing holes for connection of each component, and it is difficult to eliminate the plug member. In particular, it is extremely difficult to eliminate the plug member while also considering the reduction in size and weight of the housing.

An object of the present invention is to provide a technique capable of eliminating a plug member such as a ball caulking which has been indispensable until now. Another object of the present invention is to provide a technique capable of eliminating a plug member such as a ball caulking while reducing the size and weight of a housing.

[0006]

According to the present invention, the relative positional relationship between the components inside the housing is reviewed, and
The above-mentioned object was able to be achieved by devising the processing hole. The features of the present invention are as follows. A. The axes of the pipe connection ports for connecting to the wheel cylinder and the master cylinder are parallel to each other, and
B. Place each of those piping connections on the same side of the housing. A first for setting the first and second switching valves
And the second hole is arranged so as to be orthogonal to the direction of the axis of the pipe connection port with respect to the wheel cylinder, and
When viewed from the opening of the pipe connection port for the wheel cylinder, first, the first hole, the second hole is located in the back of the first hole, respectively, the opening and the second hole by the processing hole from the opening of the pipe connection port for the wheel cylinder. B. Connect the first and second holes directly. B. Connect the pipe connection port to the master cylinder and the first hole using an oblique hole that is inclined with respect to the axial direction of the first hole. E. A third hole for the reservoir is formed on the other side of the housing in the same direction as the axis of the pipe connection port, and is opened on the surface of the other side of the housing. A working hole extending from the opening of the third hole directly connects the reservoir with the second switching valve in the second hole.

[0007] The brake fluid pressure control device of the present invention having the features of A to E does not include any plug member such as a ball swage in the middle of a passage for communicating between the components inside the housing. For this reason, there are no machines and processes for caulking balls and the like, so that costs can be reduced and defects in the processes can be eliminated.

[0008] Among the components, the pump means, such as a plunger pump, occupies a larger volume as an object. Therefore, the pump means is arranged in the central part of the housing,
When the housing is viewed in a plan view, the third connection port for the piping connection of the master cylinder and the wheel cylinder and the reservoir.
Between the holes. Further, since the pump means generates pulsation, it is preferable to incorporate a damper for reducing pulsation inside the housing. The fourth hole for the damper, like the third hole for the reservoir, may be arranged on the other side of the housing and so as to extend parallel to the axial direction of the third hole. . Thereby, necessary communication between the passages can be realized by machining holes from the openings of the respective holes.

[0009]

FIG. 1 is a substantial circuit diagram including a brake fluid pressure control device according to the present invention. The circuit of FIG. 1 is a circuit for antilock brake control, and includes a tandem type master cylinder 10 as a hydraulic pressure generation source. The brake pipe extending from the master cylinder 10 to the wheel cylinder is a cross pipe (X pipe). Master cylinder 1
A brake pipe 21 extends from one of the ports 101 and communicates with the right front wheel cylinder 12FR and the left rear wheel cylinder 12RL through a brake fluid pressure control device 30 on the way. Similarly, the master cylinder 10
A brake pipe 22 extends from another port 102 of the left wheel wheel 12FL of the left front wheel and the wheel cylinder 1 of the right rear wheel through the brake fluid pressure control device 30.
Contact 2RR. Therefore, the brake fluid pressure control device 30 has two pipe connection ports 301 and 302 for the master cylinder 10 and four pipe connection ports 311, 312, 313 and 314 for the wheel cylinder, respectively.

A brake fluid pressure control device 30 includes a normally open two-position solenoid valve 41 as a first switching valve and a normally closed two-position solenoid valve 4 as a second switching valve inside a housing.
In addition to including a total of eight solenoid valves with two pumps, one pump means 50 consisting of two plunger pumps, two low-pressure reservoirs 60 for storing the loosening liquid, and further reducing pulsation caused by the pump means 50 Are provided. Each component is well known and will not be described in detail. Each of the solenoid valves 41 and 42 includes a solenoid and a valve body that moves in accordance with excitation of the solenoid, and can be assembled to the set hole via a seal member. Further, the low-pressure reservoir 60 includes a piston biased by a weak spring, and the piston is movably incorporated into the set hole via a seal member. Further, the damper 70 includes a partition member for partitioning the damper chamber, and an orifice communicating with the damper chamber, which can also be assembled into the set hole via a seal member. The pump means 50 includes a drive shaft driven by a motor, and a plunger portion that reciprocates by a cam supported by the drive shaft. Each of these components is known per se and can be assembled into a hole formed in the housing.

FIG. 2 is a perspective view showing an example of the housing of the brake fluid pressure control device 30 according to the present invention. The housing 300 is formed of a rectangular parallelepiped block, and one side of the block has pipe connection ports 301 and 302 for the master cylinder 10 and wheel cylinders 12FR and 12FR.
Pipe connection ports 311 to RL, 12FL, 12RR
314 are gathered and arranged. Master cylinder 10
The pipe connection ports 301, 302 are located on one side of the block and on the upper side and are separated from each other to the left and right, and the pipe connection ports 311 to 314 of the wheel cylinder are located on the lower side and are distributed at substantially equal intervals in the lateral direction. I have. Between these two groups of pipe connection ports 301, 302; 311 to 314 located at the upper part and the lower part, there is a concave part 320 extending right and left. This recess 32
Reference numeral 0 denotes a groove for reducing the weight of the housing 300, and its depth is equal to the depth of each pipe connection port. In addition, each piping connection port 301,302;
By making the axes parallel to each other, the pipe connection and drilling operations are facilitated.

It is necessary to provide holes inside the housing 300 for setting the above-mentioned components. Here, the layout of each set hole is devised. First, the first and second switching valves 41, 4
2 for setting the first and second holes 410 and 42
0 is the wheel cylinder 12FR, 12RL, 12FL,
12RR, it is arranged so as to be orthogonal to the direction of the axis of the pipe connection ports 311 to 314, and, when viewed from the opening of each of the pipe connection ports 311 to 314 to the wheel cylinder, first, the first hole 410, The second hole 42
0 is located respectively. Thereby,
Each pipe connection port 311 to 314 for the wheel cylinder
The opening 800 can directly communicate the opening with the first and second holes 410 and 420 by the processing hole 800 from the opening. In that regard, please refer to FIG. 3, which shows a longitudinal section including the line 3-3 in FIG. Note that the first and second holes 410 and 420 are opened on the lower surface of the housing 300.

Second, an oblique hole 810 that can be machined from the opening of the first hole 410 is used to connect the master cylinder 10 and the two first switching valves 41 for each brake system. In that regard, please refer to FIG. 4 which shows a longitudinal section including the line 4-4 in FIG. In this case, the connection between the oblique holes 810 to be machined from the first holes 410 and the pipe connection ports 301 and 302 of the master cylinder 10 is performed by the processing holes 820 from the respective pipe connection ports 301 and 302. Can be realized.

Third, the pump means 50 occupying a large volume is disposed in the center of the housing 300, and a hole for setting the pump means 50 (a hole 510 where a drive shaft including a cam enters), a plunger part Set hole 520,
520), the piping connection ports 301, 30
2: 311 to 314, low-pressure reservoir 60 and damper 7
The holes 600 and 700 for 0 are arranged so as to face each other. At this time, the holes 600 and 700 located on the other side of the housing 300 extend in the same direction as the axis of each pipe connection port on one side of the housing 300, and
On the other surface. Also, holes 600, 7 in each group.
00 to the pipe connection ports 301, 30 of the master cylinder 10.
Similarly to 2 and the pipe connection ports 311 to 314 of the wheel cylinder, they are separately arranged on the other side of the housing 300. Thereby, the damper 70 and the first switching valve 41 are connected by the processing hole 830 from the first hole 410 and the processing hole 871 from the hole 700 for the damper 70 (see FIG. 3). Moreover, as can be seen from FIG. 5, which shows a cross section including the axis of the hole (third hole) 600 for the low pressure reservoir 60, the hole 600 for the low pressure reservoir 60 and the second switching valve 42. The holes 420 are connected to each other by machining holes 860 from the holes 600. further,
As can be seen from FIG. 6 which shows a cross section including the axis of the hole 700 for the damper 70, the hole 700 for the damper 70 and the setting hole 520 of the plunger portion of the pump means 50 are separately formed from the hole 700. The holes 872 communicate with each other. The blind holes 901 and 901 shown in FIGS.
902 and 903 are for reducing the weight of the housing 300.

As described above, according to the brake fluid pressure control device 30 of the embodiment of the present invention, each pipe connection port 30
1, 302; 311 to 314 and the layout of each component can be specified, so that the housing 300 can be reduced in size to almost half as compared with the same type of the conventional one, and it has been indispensable until now. A plug member such as a ball caulking can be eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a substantial circuit including a brake fluid pressure control device of the present invention.

FIG. 2 is a three-dimensional view showing an example of a housing of the brake fluid pressure control device according to the present invention.

FIG. 3 is a longitudinal sectional view including a line 3-3 in FIG. 2;

FIG. 4 is a longitudinal sectional view including a line 4-4 in FIG. 2;

FIG. 5 is a cross-sectional view including the axis of the hole for the low pressure reservoir.

FIG. 6 is a cross-sectional view including an axis of a hole for a damper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Master cylinder 12FR, 12RL, 12FL, 12RR Wheel cylinder 30 Brake hydraulic pressure control device 300 Housing 301, 302 Pipe connection port for master cylinder 311 to 314 Pipe connection port for wheel cylinder 320 Depression 41 First switching valve 410 First Hole 42 Second switching valve 420 Second hole 50 Pump means 60 Low pressure reservoir (reservoir) 600 Third hole 70 Damper 700 Fourth hole 800, 820, 830, 860, 871, 872 Working hole 810 Oblique hole

Claims (6)

[Claims] 1. A device for controlling a brake fluid pressure of a wheel cylinder, which is located in a pipe connecting a master cylinder and a wheel cylinder, and which communicates between the master cylinder and the wheel cylinder. A first switching valve for shutting off, a reservoir for storing a loosening fluid from the wheel cylinder, a second switching valve for shutting off and communicating between the reservoir and the wheel cylinder, and a liquid inside the reservoir. And a pump means for sucking and pressurizing the fluid as a component, wherein the component is integrated into a block-shaped housing, the brake fluid pressure control device having the following features. A. Each axis of the pipe connection port for connecting to the wheel cylinder and the master cylinder are parallel to each other,
Moreover, the respective piping connection ports are arranged on the same side of the housing. First and second holes for setting the first and second switching valves are arranged so as to be orthogonal to an axis direction of a pipe connection port with respect to the wheel cylinder;
Moreover, as viewed from the opening of the pipe connection port for the wheel cylinder, first, the first hole and the second hole are located at the back of the first hole, respectively. B. directly communicates the opening with the first and second holes. A pipe connection port for the master cylinder and the first
D. The hole is connected to the hole using an oblique hole that is inclined with respect to the axial direction of the first hole. E. A third hole for the reservoir extends on the other side of the housing in the same direction as the axis of the pipe connection port, and is opened on the surface of the other side of the housing. A working hole extending from the opening of the third hole directly connects the reservoir with the second switching valve in the second hole. 2. The brake fluid pressure control device according to claim 1, wherein a plug member such as a ball caulking is not provided in the middle of a passage for communication between the components. 3. The pump means according to claim 1, wherein the pump means is located at a central portion of the housing, and is located between each of the pipe connection ports and the third hole when the housing is viewed in a plan view. 2. Brake fluid pressure control device. 4. A damper for reducing a pulsation caused by the pump means, and a fourth hole for the damper is provided on the other side of the housing like the third hole, and The brake fluid pressure control device according to claim 1, wherein the third hole extends in parallel with the axial direction of the third hole, and opens to the surface on the other side of the housing. 5. The pipe connection port for the wheel cylinder and the pipe connection port for the master cylinder are located on one side of the housing so as to sandwich a recess for reducing the weight of the housing. Item 6. A brake fluid pressure control device according to Item 1. 6. The brake fluid pressure control device according to claim 1, wherein the oblique hole is a machined hole from an opening of the first hole.