JPH021701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic pressure control valve system used in a brake system for vehicles, particularly automobiles.

In a vehicle that has an oil path connecting one oil chamber of the tandem master cylinder to the left front wheel and right rear wheel, and the other oil chamber to the right front wheel and left rear wheel, when the oil pressure exceeds a predetermined value during braking, the front wheel oil pressure A hydraulic control valve device is installed that lowers the rear wheel oil pressure compared to the system, and when one of the hydraulic systems fails, the pressure reduction start oil pressure of the pressure reducing valve device of the other system is increased, or the pressure reduction operation itself is canceled. However, there are already known devices that compensate for the lack of braking power. The present invention aims to provide a hydraulic pressure control valve device for a vehicle with a simple structure that can satisfy the above-mentioned functions of such a device.

Embodiments of the invention will be described based on the drawings.

First, I will explain the structure.

This device is constructed almost symmetrically around the plane of symmetry M-M except for both ends, and has first pressure reducing valve mechanisms 5 on the left and right.
3 and a second pressure reducing valve mechanism 54 are respectively arranged.

The valve case 13 is composed of the valve box 11 and the plug 38. Pressure oil coming from the first chamber of the tandem master cylinder enters from the first port 1 of the valve case 13, reaches the wheel cylinder of one front wheel from the third port 3, and reaches the wheel cylinder of one rear wheel from the fifth port 5. It is designed to reach the cylinder. The second of the tandem master cylinder
Pressure oil coming from the chamber enters from the second port 2, reaches the wheel cylinder of the other front wheel from the fourth port 4, and reaches the wheel cylinder of the other rear wheel from the sixth port 6.

Reference numeral 12 indicates a sleeve disposed at the center of the valve case 13, and reference numerals 21 and 22 indicate valve holes provided symmetrically at both ends of the sleeve 12. 23, 24 are plungers, and the valve heads 25, 23, 24 of the plungers 23, 24,
26 is fitted into the valve holes 21, 22 with seal rings 27, 28 arranged thereon. 29,3
0 is a rubber ring valve, 31 and 32 are ring valve holders having notches 33 and 34 for oil passage on the outer edge side, and 35 and 36 are stepped portions provided on the plungers 23 and 24 and are notches in the ring valve holders 31 and 32. The 33 and 34 sides are fitted. 39 and 40 are sealing cups, 41 and 42 are plungers 2
The gas chamber 4 supports the outer ends of the gas chambers 3 and 24.
Plunger 2 to increase the volume of 1, 42
3 and 24 are provided with recesses 43 and 44.
The springs 47 and 48 are compressed between the plunger steps 35 and 36 and the washers 45 and 46, respectively, and apply a preload to the plungers 23 and 24 to urge them toward the bottoms of the valve holes 21 and 22. . 49, 50 are seal rings 27, 28
Output ports 51 and 52 provided near the inlet sides of the valve holes 21 and 22 on the outside of the sleeve 12
These are annular grooves provided on the circumferential surfaces that abut the output ports 49 and 50 of the output ports 49 and 50, respectively.

The annular groove 51 on the first pressure reducing valve mechanism 53 side is connected to the bottom of the valve hole 22 of the second pressure reducing valve mechanism 54 by a first communication passage 55 provided in the sleeve 12 . Further, the annular groove 52 on the second pressure reducing valve mechanism 54 side is connected to the bottom of the valve hole 21 on the first pressure reducing valve mechanism 53 side by a second communication passage 56 provided in the sleeve 12.

Next, the operation of the above embodiment will be explained.

When braking starts, the pressure oil sent from the first and second ports 1 and 2 to the input chambers 7 and 8 is sent to the front wheel cylinder through the third and fourth ports 3 and 4, and at the same time enters the input chamber 7. , 8 to notches 33, 34, ring valves 29, 30 and plunger 23,
The output port 4 passes through the gap A between the flanges 57 and 58 of 24.
It is sent to 9,50 and sent to the rear wheel. At this time, the input chambers 7, 8 hydraulic pressure passes through the communication passages 55, 56 to the valve heads 26 of the plungers 24, 23 on the opposite side.
When the hydraulic pressure in the input chambers 7, 8 reaches a predetermined value determined by the springs 47, 48, the two plungers 23, 24
move away from each other, and the flanges 57, 5 move away from each other.
8 contacts the ring valves 29, 30 and temporarily cuts off the input, but the ring valves 29, 30 and the plunger 2
The flange portions 57 and 58 of No. 3 and 24 continuously open and close to reduce the output pressure proportionally.

The above is a case where all the hydraulic systems are normal, but if either one of the hydraulic systems fails, the hydraulic pressure applied to the valve head 25 or the end face of the valve head 26 via the communication passage 56 or the communication passage 55 is Disappear. Therefore, the sealing cross-sectional area of the seal rings 27 and 28 that make opposing output pressures face each other in a sealed manner is D,
If E is the cross-sectional area of the shaft portion of the plunger 23, 24 that is hermetically exposed to the gas chambers 41, 42 by the cups 39, 40, then if D≧E, the force of the spring 47 or spring 48 At all times, the ring valve 29 or 30 and the flange 57 or 58 of the plungers 23, 24 are kept open, and the pressure reducing valve mechanism is inoperative.

In the case of D<E, it becomes possible to arbitrarily increase the pressure reduction operation start pressure by changing the area ratio.

As described above, the brake fluid pressure control valve device according to the present invention has independent first and second pressure reducing mechanisms 53 and 54 disposed coaxially and oppositely on the left and right sides of the valve case 13, respectively, and has a pressure reducing mechanism 53 and a second pressure reducing mechanism 54 disposed coaxially and oppositely to each other. The communicating ports 5 and 6 are symmetrical plane M-M
The first and second pressure reducing valve mechanisms 5 are arranged in the sleeve 12 arranged in the center of the valve case 13.
Valve holes 21 into which valve heads 25 and 26 of plungers 23 and 24 are fitted, respectively.
22 are provided symmetrically, and output ports 49 and 50 are provided near the inlet sides of both valve holes 21 and 22, respectively, and the bottom of each valve hole 21 and 22 is provided with a seal ring 2 fitted to each valve head 25 and 26.
7 and 28, respectively, and annular grooves 51 and 52 are provided on the circumferential surface of the sleeve 12 in contact with both output ports 49 and 50, respectively.
The annular groove 51 on the pressure reducing valve mechanism 53 side is connected to the bottom of the valve hole 22 on the second pressure reducing valve mechanism 54 side by the first communication passage 55 provided in the sleeve 12, and the annular groove 51 on the second pressure reducing valve mechanism 54 side is connected to the bottom of the valve hole 22 on the second pressure reducing valve mechanism 54 side. The groove 52 is inserted into the sleeve 12.
It is connected to the bottom of the valve hole 21 on the first pressure reducing valve mechanism 53 side through a second communication passage 56 provided therein, and the device of the present invention has a simpler structure than conventional hydraulic control valves of this type. It has high reliability.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. 1-6...port, 7,8...input room, 9,1
0... Output chamber, 12... Sleeve, 13... Valve case, 21, 22... Valve hole, 23, 24
... Plunger, 25, 26 ... Valve head, 27,
28... Seal ring, 49, 50... Output port,
51, 52... Annular groove, 53, 54... Pressure reducing valve mechanism, 55, 56... Communication path.

Claims (1)

[Claims] 1 Independent first valves on the left and right sides of the valve case 13
The second pressure reducing valve mechanisms 53 and 54 are coaxially arranged facing each other, and the ports 5 and 6 communicating with the respective rear wheel cylinders are arranged closer to the plane of symmetry M-M and are arranged in the center of the valve case 16. First and second pressure reducing valve mechanisms 53, 54 are attached to the sleeve 12.
The valve head 2 of each plunger 23, 24 of
The valve holes 21 and 22 into which the valve holes 5 and 26 are fitted are provided symmetrically, and output ports 49 and 50 are provided near the inlet sides of both valve holes 21 and 22, respectively, and the bottoms of each valve hole 21 and 22 are connected to each other. Seal rings 27, 2 fitted to valve heads 25, 26
8, and annular grooves 51 and 52 are respectively provided on the circumferential surface of the sleeve 12 in contact with both output ports 49 and 50, and the annular groove 51 on the first pressure reducing valve mechanism 53 side is The second pressure reducing valve mechanism 5 is connected to the first communication passage 55 provided in the sleeve 12.
While connecting the bottom of the valve hole 22 on the fourth side,
A brake hydraulic pressure control valve device in which an annular groove 52 on the pressure reducing valve mechanism 54 side is connected to the bottom of a valve hole 21 on the first pressure reducing valve mechanism 53 side by a second communication passage 56 provided in the sleeve 12.