JPH0247380B2 - - 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 passage connecting one oil chamber of the tandem master cylinder to the left front wheel and right rear wheel from 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 changes. In comparison, a hydraulic control valve device is installed to lower the rear wheel oil pressure, and when one of the hydraulic systems fails, the pressure reduction operation start oil pressure of the pressure reduction valve device of the other system is increased, or the pressure reduction operation itself is canceled. Motors that compensate for the lack of braking power are already known. It is an object of the present invention to provide a hydraulic control valve device for a vehicle with a simple structure that can satisfy the above-mentioned functions.

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 2 on the left and right.
and a second pressure reducing valve mechanism 22 are respectively arranged.

A valve case 12 is constituted by the valve box 11 and the plug body 24. The pressure oil coming from the first chamber of the tandem master cylinder is transferred to the first port 1 of the valve case 12.
The third port 3 leads to the wheel cylinder of one front wheel, and the fifth port 5 leads to the wheel cylinder of one rear wheel. Pressure oil coming from the second chamber of the tandem master cylinder 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. It's becoming like that.

The plug 24 fitted on the right side of the valve box 11 is the C ring 2.
6 prevents it from coming off, and a boot 28 is attached. A center sleeve 13 is constructed by press-fitting and fixing a sleeve lid 15 into a sleeve body 14. Reference numerals 29 and 30 designate plungers, the inner ends of which are fitted into the center sleeve 13 and prevented from coming off by retaining clips 31 and 32, and a set spring 17 is compressed between both retaining clips 31 and 32. 18 is a gas chamber. 33 and 34 are seal cups, and 37 and 38 are ring seals, which are arranged so as to be able to come into and out of annular valve seats on stepped walls at both outer ends of the input chambers 7 and 8 formed on both sides of the center sleeve 13, respectively. At the same time, coil spring 3
5 and 36, it is configured to contact the annular valve seat under normal conditions. 39 and 40 are valve holes provided in the valve case 12, and the plunger 29,
No. 30 outer end head is inserted so as to leave an oil passage on the peripheral surface and outer end surface.

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

When braking is started and pressure oil is sent from the first and second ports 1 and 2, the pressure oil is sent to the third and fourth ports 3 and 4 via the input chambers 7 and 8, and the ring seals 37 and 38 and the plunger Pressure oil is sent to the output chambers 9 and 10 through gaps 29 and 30. When the oil pressure in the output chambers 9, 10 reaches a predetermined value, the steps 41, 42 of the plungers 29, 30 close the ring seal 3.
Proportional pressure reduction is performed by repeating connection and disconnection in steps 7 and 38.

If either one of the hydraulic circuits is damaged, the oil pressure in the input chamber 8 (or 7) decreases. Then, the hydraulic pressure in the input chamber 7 (or 8) acts on the end face of the center sleeve 13, and a force in the opposite direction is also applied to the circular area within the outer edge of the annular valve seat minus the cross-sectional area of the plunger 29 (or 30). However, since the end surface area of the center sleeve 13 is larger, the center sleeve 13 is pushed and the outer end of the plunger 30 (or 29) is inserted into the valve hole 40.
(or 39) in contact with the hole bottom of the plunger 29
(or 30) contacts the inner end of the plunger 30 (or 29), and the center sleeve 13
The plunger 29 (or 30) moves until it is stopped by the retaining clip 31 (or 32). In this state, the plunger 29
The stepped portion 41 (or 42) of the ring seal 37 (or 30) pushes the end face of the ring seal 37 (or 38) and separates it from the annular valve seat of the valve case 12, causing the oil provided on the outer peripheral surface of the ring seal 37 (or 38) to The output chamber 9 (or 10) and the input chamber 7 (or 8) are brought into communication through the channel, and proportional depressurization is stopped.

As described above, the brake hydraulic pressure control valve device according to the present invention includes the sleeve body 14 in the valve case 12.
A center sleeve 13 consisting of a sleeve cover body 15 and a sleeve lid body 15 is inserted into the center sleeve 1, and the inner ends of plungers 29 and 30 arranged symmetrically on the left and right are inserted into the center sleeve 1.
3, and a set spring 17 is compressed between the two retaining clips 31 and 32, and both outer ends of the input chambers 7 and 8 formed on the left and right sides of the center sleeve 13 are stepped. Ring seals 37 and 38 are arranged separably on the annular valve seat on the wall, and are constructed so as to be in contact with the annular valve seat under normal conditions by means of coil springs 35 and 36. A valve hole 39 provided with an oil passage and provided at both ends of the valve case 12,
40, the outer end heads of the plungers 29, 30 leave oil passages on their circumferential surfaces and outer end surfaces, and the step portions 41, 42 of the plungers 29, 30 face the ring seals 37, 38 so as to be disconnectable. Therefore, the device of the present invention has a simpler structure and higher reliability than conventional hydraulic control valves of this type.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the present invention. 12... Valve case, 13... Center sleeve, 14... Sleeve body, 15... Sleeve lid body, 17... Set spring, 29, 30...
Plunger, 31, 32...Keeping clip, 3
7, 38... Seal ring, 39, 40... Valve hole, 41, 42... Step portion.

Claims (1)

[Claims] 1 A center sleeve 13 consisting of a sleeve main body 14 and a sleeve lid 15 is fitted into the valve case 12, and the plunger 2 is arranged symmetrically on the left and right.
The inner ends of the sleeves 9 and 30 are fitted onto the center sleeve 13 to prevent them from coming off with the retaining clips 31 and 32, and a set spring 17 is inserted between the retaining clips 31 and 32.
are contracted, and ring seals 37 and 38 are removably disposed on annular valve seats on both outer end stepped walls in input chambers 7 and 8 formed on the left and right sides of the center sleeve 13, and coil springs 35, 36, the ring seals 37, 38 are configured to contact the annular valve seat under normal conditions, and oil passages are provided on the outer surfaces of the ring seals 37, 38, and the plunger 29, The outer end head of 30 leaves an oil passage on its peripheral surface and outer end surface, and the plunger 2
The step portions 41 and 42 of 9 and 30 are connected to the ring seal 3.
A brake fluid control valve device configured to face 7 and 38 so as to be connectable and disconnectable.