JPH1044957A - Brake fluid pressure control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly slide a reservoir piston by opening an atmospheric opening end of a reservoir part on the atmospheric side through a bolt through hole provided in another member to secure an opening for the atmospheric opening end of the reservoir with the atmosphere without providing any groove in another member. SOLUTION: An atmospheric ventilation hole 30 is provided in a drive circuit part 2 as an atmospheric flow passage between an atmospheric opening end 21 to be connected to an atmospheric part 20 of a reservoir part 15 and a bolt through hole 14 for tightening. When the wheel cylinder fluid pressure is reduced, the working fluid in the wheel cylinder flows into the reservoir part 15 to change the capacity of a circulation passage 16 as a temporary fluid sump. When a piston 17 is operated downward and the working fluid is stored, the air in the atmospheric part 20 of the reservoir flows to the atmospheric side from the atmospheric opening end 21 through the atmospheric ventiation hole 30, the bolt through hole 14, and further a groove 13a in a seat face of a tightening bolt 13. Generation of the compressed air pressure caused by the piston movement in the atmospheric part 20 of the reservoir can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a brake fluid pressure control device, and more particularly, to a brake fluid pressure control device suitably used for brake fluid pressure control such as an anti-lock brake control device.

[0002]

2. Description of the Related Art An anti-lock control device is provided in a main circuit for transmitting a hydraulic fluid supplied from a master cylinder to a wheel cylinder by a braking operation of a driver, and an inflow for communicating and shutting off the hydraulic fluid to the wheel cylinder. With a valve,
A recirculation path for recirculating the hydraulic fluid from the wheel cylinder to the master cylinder side is provided, and the recirculation path is provided with a discharge valve for discharging the hydraulic fluid in the wheel cylinder and reducing the pressure in the wheel cylinder. A pump for discharging the hydraulic fluid from the passage toward the main circuit, a control valve portion having a reservoir portion for separating the return passage from the atmosphere and changing the volume of the return passage within a predetermined range, and a wheel cylinder hydraulic pressure. And a drive circuit part for sending a drive signal to a solenoid coil constituting an inflow valve and an exhaust valve according to the skid condition of the wheels and the like, and a pump drive motor in order to pressurize, hold and reduce the pressure. .

The above-mentioned control valve portion is installed in an engine room in a bad environment where there are many dusts and water drops, and a drive circuit portion is installed separately from the control valve portion in an engine room or a driver's cab. The part and the drive circuit part are connected by a wire harness.

On the other hand, in addition to the above-described anti-lock brake system, there is a traction control system that controls the driving force by applying a brake to a wheel that is idling without a driver's braking operation. For the control valve part of the control device, it is proposed to fasten another member part with the function of the traction control system, to reduce the connection part between the control valve part and the drive circuit part, and to install the drive circuit part. Provided is a brake fluid pressure control device which can be installed in an engine room by integrally forming a drive circuit portion and a drive circuit portion as separate members with fastening bolts or the like in order to make the space a space for installing other components. Have been. For example, JP-A-7-
Japanese Patent Application Publication No. 257341 proposes a brake fluid pressure control device as shown in FIG.

The brake fluid pressure control device is provided in a main circuit between a master cylinder and a wheel cylinder, and has a housing 3 having input / output ports connected to the master cylinder and the wheel cylinder, respectively. Inlet valve
A control valve portion 1 including a solenoid coil 4 for driving a discharge valve, a pump (not shown) provided in a reservoir portion and a housing, and a pump driving motor 5 provided integrally with the housing 3; The drive circuit portion 2 includes a mounting board 6, a solenoid socket 7, a motor socket 8, an upper case 9, a lower case 10, a waterproof packing 12 having a groove 11, and the like. Has been concluded.

FIG. 10 shows a detailed configuration of the reservoir portion inside the housing 3 shown in FIG. 9 as viewed along the line AA including the bolt through-holes 14. In FIG. 10, reference numeral 15 denotes a reservoir for changing the volume of the return passage 16 as a temporary reservoir for the hydraulic fluid to reduce the hydraulic pressure of the wheel cylinder by operating the discharge valve. Piston 1
Reference numeral 8 denotes a case where the pressure in the circulation path 16 is always the atmospheric pressure when the pressure in the circulation path 16 is atmospheric pressure.
6, a spring for keeping the volume of 6 at a minimum position, 19 a seal for liquid seal between the return passage 16 and the atmosphere portion 20, and 11 a groove provided on the waterproof packing 12. As is apparent from FIG. 9, the waterproof packing 12 is provided from one end to the other end, and the groove 11 opens the atmosphere opening end 21 of the reservoir 15 to the atmosphere. 10 is a lower case, 9 is an upper case,
Reference numeral 6 denotes a mounting board, and the driving circuit portion 2 having these configurations
The control valve portion 1 is fastened to the housing 3 by fastening bolts 13.

The operation of the piston 17 in FIG.
The pressure rises and falls due to the difference between the downward force due to the pressure in the return passage 16 and the resistance between the spring 18 and the liquid sealing seal 19. Of the housing 3 and the piston 17 for accommodating the piston 17 in order to smoothly operate the piston 17.
The rusting of the sliding portion 3a cannot be tolerated. That is, it is necessary to devise a means that does not include moisture in the reservoir portion 15, and the air opening end 21 of the reservoir portion 15 is always opened to the atmosphere so that the resistance other than the spring and the liquid sealing seal against the liquid pressure is applied. You should try not to occur.

[0008]

In the brake fluid pressure control device shown in FIG. 10, the reservoir air opening end 21 of the control valve portion 1 and the air opening are connected to the waterproof packing 1 of the drive circuit portion 2.
2, when the drive circuit portion 2 is located below the control valve portion 1 as shown in FIG. 9, the groove 11 provided in the waterproof packing 12 faces upward, and dust and mud accumulate. The opening area between the reservoir air opening end 21 and the atmosphere shown in FIG. 10 is reduced, or dust or mud adheres to the sliding portion while absorbing moisture, causing corrosion of the reservoir piston sliding portion 3a and causing the piston 17 to move. There is a problem that hinders smooth sliding.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional brake fluid pressure control device, and has a structure in which the reservoir air opening end 21 and the air are separated from each other without providing a groove in a separate member. The purpose of the present invention is to provide a brake fluid pressure control device that secures an opening and enables the reservoir piston 17 to slide smoothly.

[0010]

Accordingly, a first aspect of the present invention provides a brake fluid pressure control device having a control valve portion having a reservoir portion and a separate member portion fastened to the open end side of the reservoir portion. The air opening end of the reservoir portion is opened to the atmosphere side through a bolt through hole for fastening provided in the separate member portion without providing a groove for opening to the atmosphere at the upper part of the separate member portion. It is intended to provide a brake fluid pressure control device characterized in that:

According to a second aspect of the present invention, there is provided a brake according to the first aspect, wherein an open end of the reservoir portion communicates with a bolt through hole through an air flow hole provided in a separate member. A fluid pressure control device is provided.

According to a third aspect of the present invention, there is provided the brake fluid pressure control according to the first aspect, wherein an open end of the reservoir portion is communicated with a bolt through hole through a groove provided in the housing. An apparatus is provided.

A fourth aspect of the present invention is characterized in that, in the first aspect, the open end of the atmosphere of the reservoir portion is communicated with the bolt through hole through a groove or a notch provided in a separate member. To provide a brake fluid pressure control device.

According to a fifth aspect of the present invention, in any one of the first, second, third, and fourth aspects, at least one groove is provided on the bottom surface side of the fastening bolt, and the bolt through hole is opened to the atmosphere by this groove. The present invention provides a brake fluid pressure control device characterized by the following.

According to a sixth aspect of the present invention, in any one of the first, second, third, and fourth aspects, at least one groove is provided on a joint surface of the separate member and the fastening bolt seat surface, and the bolt through-hole is formed by this groove. The brake fluid pressure control device is characterized by being open to the side.

According to a seventh aspect of the present invention, there is provided a brake fluid pressure control device having a control valve portion having a reservoir portion and a separate member portion fastened to an atmosphere opening end side of the reservoir portion. The brake fluid pressure control device is characterized in that the end is open to the inside of another member through an air flow hole provided in the above another member portion.

[0017] Claim 8 is claim 1, 2, 3, 4,
The brake fluid pressure control device according to any one of 5, 6, and 7, wherein the separate member portion is fastened below the control valve portion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. FIGS. 1 and 2 show a configuration diagram in a case where the brake fluid pressure control device 22 according to the first embodiment of the present invention is used in an antilock brake system. The brake fluid pressure control device 22 is provided in a main circuit 25 between a master cylinder 23 and a wheel cylinder 24 of the vehicle, and has a housing 3 having input / output ports connected to the master cylinder 23 and the wheel cylinder 24, respectively. Inflow valve 26 and discharge valve 27 disposed in body 3, reservoir unit 15, pump 28 disposed in housing 3, and housing 3
Upon receiving a speed signal from a wheel speed sensor 29 and a control valve portion 1 including a pump driving motor 5 and the like, which are disposed integrally with the motor, an inlet valve 26 and an outlet valve 27 are formed according to the skid condition of the wheels. It is composed of a drive circuit portion 2 having a drive circuit for sending a drive signal to the solenoid coils 26a and 27a and the pump drive motor 5, and both are fastened by fastening bolts 13 (not shown).

FIG. 2 is a schematic sectional view showing details of the reservoir section 15 inside the housing 3 of FIG. In FIG. 2, the reservoir section 15 changes the volume of the recirculation path 16 as a temporary reservoir for hydraulic fluid in order to reduce the hydraulic pressure of the wheel cylinder by the operation of the discharge valve. The accommodated piston 18 is a spring for always keeping the volume of the return passage 16 at the minimum position when the pressure in the return passage 16 is atmospheric pressure, and 19 is a liquid between the return passage 16 and the atmospheric portion 20. Sealing seal, 10 is a lower case, 9 is an upper case, 12 is a waterproof packing, 6 is a mounting board, and the drive circuit portion 2 having these configurations is inserted into a bolt through hole 14 provided in the drive circuit portion 2. The control valve portion 1 is fastened to the housing 3 by fastening bolts 13. And 3
Reference numeral 0 denotes an air flow path between an air opening end 21 connected to the air portion 20 of the reservoir portion 15 and a bolt through hole 14 provided in the drive circuit portion 2 for fastening.
It is an air circulation hole provided in.

Next, the operation of the brake fluid pressure control device 22 of the first embodiment will be described. First, when the wheel cylinder pressure is increased, the inflow valve 26 is opened as shown in FIG.
The discharge valve 27 is in the closed position, and in FIG. 2, the piston 17 of the reservoir portion 15 is located at an upper position in the figure by the urging force of the spring 18 so as to minimize the volume of the return path 16.

In order to reduce the hydraulic pressure of the wheel cylinder 24, the inflow valve 26 is closed and the discharge valve 27 is opened by receiving a drive signal from the drive circuit portion 2 to the solenoid coils 26a and 27a in FIG. In order to reduce the pressure, the working fluid in the wheel cylinder 24 flows into the reservoir section 15 for changing the volume of the return path 16 as a temporary reservoir. In response to this, the piston 17 of FIG. 2 operates downward in the figure to store the hydraulic fluid. At this time, the air existing in the reservoir atmospheric portion 20 flows from the atmospheric opening end 21 of the reservoir portion 15 to the atmospheric circulation hole 30, the bolt through hole 14 provided in the drive circuit portion 2, and the groove 13 a in the seating surface of the fastening bolt 13.
And flows to the atmosphere side, and compressed air pressure due to piston movement is not generated in the reservoir atmosphere portion 20.

The size of the bolt through hole 14 is appropriately determined according to the capacity of the reservoir atmospheric portion 20 and the size of the fastening bolt 13, but the gap between the bolt through hole 14 and the fastening bolt 13 is increased in strength and the like. When the size is reduced for the reason described above, the cross-section of the fastening bolt 13 may be made non-circular, and a recess may be partially provided, for example.

In the first embodiment, two 2-port 2-position solenoid valves are used as the configuration of the inflow valve 26 and the discharge valve 27. However, the present invention employs a flow control valve and a 3-port 3-position solenoid valve. Other combinations, such as a solenoid valve, are also possible and are not limited to the configuration of the solenoid valve of FIG.

3 (a), 3 (b) and 3 (c) are explanatory views of the fastening bolt 13 in the brake fluid pressure control device of FIG. 2, and 13a is a groove provided on a seat surface 13b of the fastening bolt 13. . 3A, 3B and 3C, the groove 13a
The number is 3 and the groove shape is concave, but the change of the number and the shape is appropriately determined by the capacity of the reservoir air portion and the method of manufacturing the fastening bolt. However, the present invention is not limited to the numbers and shapes shown in FIGS.

FIG. 4 is a schematic sectional view showing details of a reservoir when the brake fluid pressure control device 31 according to the second embodiment of the present invention is used in an antilock brake system. In FIG. 4, reference numeral 32 denotes an air passage provided between the air opening end 21 connected to the air portion 20 of the reservoir portion 15 of the control valve portion 1 and the internal thread portion 33 provided on the housing 3. Groove. The second embodiment differs from the first embodiment in the air flow path in the reservoir atmospheric portion when the wheel cylinder pressure is reduced. That is, the air in the reservoir atmospheric portion 20 at the time of pressure reduction passes from the atmospheric open end 21 of the reservoir portion 15 via the groove 32 provided in the housing 3 to the bolt through hole 14 provided in the drive circuit portion 2, Furthermore, it flows to the atmosphere side through the groove 13a of the seating surface of the fastening bolt 13.

FIG. 5 is a schematic sectional view showing details of a reservoir when the brake fluid pressure control device 34 according to the third embodiment of the present invention is used in an antilock brake system. In FIG. 5, reference numeral 35 denotes a waterproof packing 36 provided as an air passage between an air opening end 21 connected to the air portion 20 of the reservoir portion 15 of the control valve portion 1 and a bolt through hole 14 provided in the drive circuit portion 2. Groove. In the third embodiment, the air existing in the reservoir atmospheric portion 20 at the time of depressurization passes through the groove 35 provided in the waterproof packing 36 from the atmospheric open end 21 of the reservoir portion 15, and passes through the bolt through hole 1.
4. Further, it flows to the atmosphere side through the groove 13a on the bearing surface of the fastening bolt 13.

FIG. 6 shows the brake fluid pressure control device 34 of FIG.
FIG. 3 is an explanatory view of the waterproof packing 36 in the first embodiment, and has a groove 35 communicating with the atmosphere opening end 21 and the fastening bolt through hole 14. It is needless to say that the groove 35 in this case is not a groove provided from one end to the other end of the waterproof packing, unlike the groove 11 provided in the waterproof packing 12 in FIG.
Further, the shape of the groove 35 is not limited to the shape shown in FIG. 6, but may be a notch that individually connects a plurality of open ends to the bolt through holes.

FIG. 7 is a schematic sectional view showing details of a reservoir when the brake fluid pressure control device 37 according to the fourth embodiment of the present invention is used in an antilock brake system. In FIG. 7, reference numeral 38 denotes a groove provided on the joint surface 39 of the lower case 10 of the drive circuit portion 2 with the fastening bolt seat surface 13b. In the fourth embodiment, the air existing in the air portion 20 of the reservoir portion 15 of the pressure reducing control valve portion 1 is discharged from the air opening end 21 of the reservoir portion 15 to the air circulation hole 30 provided in the drive circuit portion 2 by a bolt. It flows through the through hole 14 and the groove 38 provided in the lower case joining surface 39 to the atmosphere side.

FIG. 8 is a schematic sectional view showing details of a reservoir when the brake fluid pressure control device 40 according to the fifth embodiment of the present invention is used in an antilock brake system. In FIG. 8, reference numeral 41 denotes an air circulation hole provided in the drive circuit portion 2 as an air flow path between the open end 21 of the reservoir portion 15 and the inside 42 of the drive circuit portion 2. In the fifth embodiment, the air existing in the air portion 20 of the reservoir portion 15 of the reservoir portion 15 of the control valve portion 1 at the time of depressurization is supplied from the air opening end 21 of the reservoir portion 15 to the air circulation provided in the drive circuit portion 2. By flowing through the hole 41 to the inside of the drive circuit 42, the atmospheric capacity is expanded, and the compressed air pressure of the atmospheric part 20 is reduced.

A small amount of liquid flows from the reservoir 15 through the outer periphery of the piston, depending on the capacity of the liquid seal 19. When the separate member is a drive circuit portion, the leaked liquid flows into the mounting board of the drive circuit and causes performance defects such as short circuit and substrate corrosion. It is preferable that the liquid does not flow into the drive circuit. Also, a liquid seal 1
If there is no risk of liquid leakage such as diaphragm type 9
Examples include the first and second embodiments, including the second and third embodiments.
Various configurations such as the fourth and fifth embodiments are available.

[0031]

According to the brake fluid pressure control device of the first to sixth aspects, the gap between the bolts is used as an opening path between the reservoir atmospheric portion and the atmosphere, so that the sliding portion of the piston is further moved away from the atmosphere, and It is possible to realize a brake fluid pressure control device that is advantageous for the accumulation of mud.

In the brake fluid pressure control device according to the seventh aspect, the air pressure in the reservoir atmospheric portion is reduced by expanding the atmospheric capacity into the separate member portion, and the open end of the reservoir is not communicated with the outside. Thus, a more advantageous brake fluid pressure control device can be realized.

In the brake fluid pressure control device according to the eighth aspect, since the separate member is located below the control valve portion and the respiratory path is directed downward, a brake fluid pressure control device which is particularly advantageous against accumulation of dust and mud can be realized. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram when a brake fluid pressure control device according to a first embodiment of the present invention is used in an antilock brake system.

FIG. 2 is a schematic sectional view showing details of a reservoir unit in FIG. 1;

FIG. 3A is a front view of the fastening bolt of FIG. 2, and FIG.
Is a plan view, and (c) is a left side view.

FIG. 4 is a schematic sectional view showing details of a reservoir when a brake fluid pressure control device according to a second embodiment of the present invention is used in an antilock brake system.

FIG. 5 is a schematic sectional view showing details of a reservoir when a brake fluid pressure control device according to a third embodiment of the present invention is used in an antilock brake system.

FIG. 6 is a view showing a waterproof packing according to a third embodiment.

FIG. 7 is a schematic sectional view showing details of a reservoir when a brake fluid pressure control device according to a fourth embodiment of the present invention is used in an antilock brake system.

FIG. 8 is a schematic sectional view showing details of a reservoir when a brake fluid pressure control device according to a fifth embodiment of the present invention is used in an antilock brake system.

FIG. 9 is a diagram showing a configuration of a conventional brake fluid pressure control device.

FIG. 10 is a schematic cross-sectional view showing details of a reservoir unit in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control valve part 2 ... Drive circuit part 3 ... Housing 13 ... Fastening bolt 13a ... Groove of fastening bolt seating surface 14 ... Bolt through hole 15 ... Reservoir part 16 ... Recirculation path 17 ... Piston 18 ... Spring 19 ... Seal for liquid seal 20 ... Atmospheric portion 21 ... Atmospheric open end 22 ... Brake fluid pressure control device 26 ... Inflow Valve 27: Discharge valve 30: Air circulation hole

Claims (8)

[Claims] 1. An inflow valve (26) for controlling brake fluid pressure, which is disposed in a main circuit between a master cylinder (23) and a wheel cylinder (24) of a vehicle and communicates and shuts off hydraulic fluid to and from the wheel cylinder. A recirculation path 16 for recirculating the hydraulic fluid from the cylinder to the master cylinder side is provided,
A pump that discharges the hydraulic fluid from the wheel cylinder to the main circuit by discharging the hydraulic fluid in the wheel cylinder to the recirculation path 16 to reduce the wheel cylinder pressure; It has a control valve portion 1 having a reservoir portion 15 capable of separating the atmosphere portion and changing the volume of the return passage 16 within a predetermined range, and a separate member portion 2 fastened to the atmosphere opening end side of the reservoir portion 15. In the brake fluid pressure control device described above, the air opening end 21 of the reservoir portion 15 passes through the bolt through hole 14 for fastening provided in the separate member portion 2,
A brake fluid pressure control device which is open to the atmosphere. 2. The air opening end 21 of the reservoir portion 15 is communicated with the bolt through hole 14 via an air circulation hole 30 provided in the separate member portion 2. Brake fluid pressure control device. 3. The brake fluid according to claim 1, wherein the air opening end of the reservoir portion communicates with the bolt through hole via a groove provided in the housing. Pressure control device. 4. The air opening end 21 of the reservoir portion 15 is communicated with the bolt through hole 14 through a groove 35 or a notch provided in the separate member portion 2. 4. The brake fluid pressure control device according to item 1. 5. At least one bolt is provided on the bottom side of the fastening bolt 13.
The two grooves are provided, and the bolt through holes 14 are opened to the atmosphere side by the grooves.
5. The brake fluid pressure control device according to any one of 4. 6. At least one groove 38 is provided in the joint surface 39 of the separate member portion 2 with the fastening bolt seat surface, and the groove 38 opens the bolt through hole 14 to the atmosphere side. Item 6. The brake fluid pressure control device according to any one of Items 1, 2, 3, and 4. 7. An inflow valve 26 for controlling brake fluid pressure, which is provided in a main circuit between a master cylinder 23 and a wheel cylinder 24 of the vehicle and communicates and shuts off hydraulic fluid to and from the wheel cylinder. A recirculation path 16 for recirculating the hydraulic fluid from the cylinder to the master cylinder side is provided,
A pump that discharges the hydraulic fluid from the wheel cylinder to the main circuit by discharging the hydraulic fluid in the wheel cylinder to the recirculation path 16 to reduce the wheel cylinder pressure; It has a control valve portion 1 having a reservoir portion 15 capable of separating the atmosphere portion and changing the volume of the return passage 16 within a predetermined range, and a separate member portion 2 fastened to the atmosphere opening end side of the reservoir portion 15. In the brake fluid pressure control device described above, the air opening end 21 of the reservoir portion 15 is opened to the inside of another member 42 via the air circulation hole 41 provided in the another member portion 2. Brake fluid pressure control device. 8. The control device according to claim 1, wherein said separate member portion is fastened below said control valve portion.
The brake fluid pressure control device according to any one of 4, 5, 6, and 7.