JPH0241459B2 - - 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 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 hydraulic system, and when one of the hydraulic systems fails, the pressure reducing operation start oil pressure of the pressure reducing valve device of the other system is increased, or the pressure reducing 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 configuration.

This device is constructed symmetrically around a plane of symmetry M-M except for the valve case and a few parts at both ends of the valve case, and includes a first pressure reducing valve mechanism 49 and a second pressure reducing valve mechanism 50.
are arranged facing each other.

Valve box 11 and plug 1 having a bottomed cylinder hole
2 constitute a valve case 16. Pressure oil coming from the first chamber of the tandem master cylinder enters from the first port 1 of the valve case 16, reaches the wheel cylinder of one front wheel from the third port 3, and enters the wheel cylinder of one rear wheel from the fifth port. It is starting to reach this point. The pressure oil coming from the second chamber of the tandem master cylinder is
It enters from port 2, reaches the wheel cylinder of the other front wheel from the fourth boat 4, and enters the sixth port 6.
from the rear wheel cylinder to the other rear wheel cylinder.

MM is a virtual central symmetrical plane orthogonal to the cylinder hole of the valve body 11, 14 is a center sleeve, 21,
22 is a sleeve arranged to face each other around the central plane of symmetry MM, 23 and 24 are plungers, 2
5, 26 are piston cups, 27, 28 are cup springs, 29, 30 are ring seals, 31,
32 is a cup hold sleeve fitted into the sleeves 21 and 22 and fixed by any means; 33 is a coil spring compressed between the bottom of the valve box and the cup hold sleeve 31; and 35 and 36 are plungers 2
3 and 24 are spring holders fitted, 15 is a center spring, 7 and 8 are input chambers, 9 and 10 are output chambers, and 13 is a gas chamber.

42 is a hat-shaped spring holder whose protrusion is inserted into the other sleeve 22;
A set spring 44 compressed between the spring holder 2 and the plug 12 presses the edge of the spring holder 42 against an enlarged diameter stepped portion 46 provided on the opening side of the cylinder hole of the valve body 11 during normal non-braking conditions. Further, a coil spring 33 compressed between the cup hold sleeve 31 and the bottom of the valve body transmits a pressing force to the sleeve 21, the center sleeve 14, and the sleeve 22 in this order, and presses these three sleeves against the spring holder 42. Here, the set spring 44 is configured to press the spring holder 42 with a force greater than that of the coil spring 33. The opposing parts other than the coil spring 33, spring holder 42, and set spring 44 are symmetrically arranged as common parts.

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

When braking starts, the pressure oil sent to the first and second ports 1 and 2 is sent to the front wheel cylinder from the third and fourth ports 3 and 4, and at the same time from the input chambers 7 and 8 to the ring seal 29. , 30 and the plungers 23, 24, and the gaps between the cup hold sleeves 31, 32 and the plungers 23, 24 (and the plungers 2 in the right half of the figure).
4 and the spring holder 42), enters the output chambers 9, 10, enters the gap between the end faces of the plungers 23, 24 and the bottom of the valve case 16, and pushes the plungers 23, 24 inward. , 36, the center spring 15 is compressed. And the tsuba 4 of the plungers 23 and 24
The inner end surfaces of the ring seals 7 and 48 repeatedly come into contact with and separate from the ring seals 29 and 30, thereby performing proportional pressure reduction. In this case, the gap between the ring seals 29, 30 and the flanges 47, 48 when not in operation is C, and both plungers 2
When the interval between 3 and 24 is A, A>2C.

If the system in one input chamber 8 (or 7) is damaged, the pressure oil in the other input chamber 7 (or 8) will damage the sleep 21 (or 22), center spree 14, sleeve 22 (or 21) (and input chamber 8 is damaged, the spring holder 42)
Press to check the distance between one sleeve 21 and the bottom inside the valve case 16 and the spring holder 4 when not in operation.
2 and the plug 12 are equally spaced at B, and these are movable by a length B so that the space becomes zero. Also plunger 23 (or 24)
moves by distance A. Then, if A<B+C, the tsuba 4 of input chamber 7 (or 8) on the undamaged side
7 (or 48) and ring seal 29 (or 3
There will be a gap between 0). Therefore, proportional depressurization is stopped.

As described above, in the brake hydraulic control valve device according to the present invention, the plungers 23 and 24 are disposed in the bottomed cylinder hole of the valve box 11 so as to face each other about the central plane of symmetry MM, and both opposing plungers 2
Spring holder 3 fitted into the reduced diameter part of 3 and 24
A center spring 15 is disposed between the plungers 23 and 24, and a center sleeve 14 is disposed between the plungers 23 and 24. piston cup 2
5, 26, cup springs 27, 28, ring seals 29, 30, and cup hold sleeves 31, 32 are fitted in order, and the cup hold sleeves 31, 32 are fixed to the sleeves 21, 22, and one sleeve 21 and the valve body 11 are fitted. A coil spring 33 is compressed between the sleeve 22 and the bottom, and the outer edge of the other sleeve 22 is in contact with an enlarged diameter step 46 provided on the opening side of the cylinder hole of the valve body 11, and the protrusion is in contact with the other sleeve 22. A set spring 44 is disposed through a hat-shaped spring holder 42 inserted into the sleeve 22, and is closed with the plug 12, and the ring seals 29, 30 and plungers 23, 2 are in an inoperative state.
4, the distance between the flanges 47 and 48 is C, the distance between both plungers 23 and 24 is A, and the one sleeve 2
1 and the bottom of the valve box 11 and the spacing between the spring holder 42 and the plug 12 are configured to be equal to B, and
The structure is such that the relationships A>2C and A<B+C are established, and the pressure is reduced between the ring seals 29, 30 and the flanges 47, 48, and the coil spring 33, spring holder 42, and set spring 44 are excluded. The opposing parts have common parts arranged symmetrically, and compared to conventional hydraulic control valves of this type, the device of the present invention can use many common parts for the opposing parts, and has a simple structure and high reliability. It is.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the present invention. 12...Plug, 14...Center sleeve, 15
...Center spring, 16...Valve case, 21,
22... Sleeve, 23, 24... Plunger, 2
5, 26... Piston cup, 27, 28... Cup spring, 29, 30... Ring seal, 31,
32...Cup hold sleeve, 33...Coil spring, 35, 36...Spring holder, 4
2... Spring holder, 44... Set spring, 46... Step portion, 47, 48... Tsuba.

Claims (1)

[Claims] 1 Plungers 23, 2 are placed in the bottomed cylinder hole of the valve body 11, facing each other with the central plane of symmetry M-M as the center.
4, and the center spring 15 is arranged between the spring holders 35 and 36 fitted in the reduced diameter portions of both opposing plungers, and the center sleeve 14 is arranged between both the plungers 23 and 24 so as to be in contact with the center sleeve 14. An outwardly concave sleeve 2 fitted over each plunger 23, 24
Piston cups 25, 26, cup springs 27, 28, and ring seals 29,
30 and cup hold sleeves 31, 32 are fitted in sequence, and the cup hold sleeves 31,
32 are fixed to the sleeves 21 and 22, a coil spring 33 is compressed between one sleeve 21 and the bottom of the valve box 11, and a coil spring 33 is installed on the outside of the other sleeve 22 on the opening side of the cylinder hole of the valve box 11. The edge is in contact with the enlarged diameter stepped portion 46 and the protrusion is in contact with the other sleeve 2.
A set spring 44 is disposed through a hatch-shaped spring holder 42 inserted into the ring seal 2, and the ring seal 2 is closed with a plug 12.
9, 30 and plungers 23, 24 tsuba 47, 4
8, the spacing between both plungers 23 and 24 is A, and the spacing between the one sleeve 21 and the bottom of the valve box 11 and the spacing between the spring holder 42 and the plug 12 are equal to B, and A >2C and A<
Establish the relationship B + C, and ring seal 2
9, 30 and the collars 47, 48, and further, the opposing parts other than the coil spring 33, spring holder 42, and set spring 44 are symmetrically arranged as common parts. Hydraulic pressure control valve device.