JPH0226767Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a hydraulic control valve device 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. This 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.

An embodiment of this invention will be described based on the drawings.

First, the structure will be explained.

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.
1 and a second pressure reducing valve mechanism 22 are respectively arranged.

A valve case 13 is constituted by the valve box 11 and the plug 12. 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.

A main cylinder 14 and small cylinders 23 and 24 are coaxially provided in the valve case 13 at both ends thereof. The main cylinder 14 has gaskets 25, 2.
A center sleeve 15 is slidably and liquid-tightly fitted through the center sleeve 6. and center sleeve 1
5 is provided with a through hole 16. Synthetic rubber ring seals 29, 30 are fitted into stepped portions 27, 28 formed at the boundaries between the main cylinder 14 and the small cylinders 23, 24, and the inner diameter C of the ring seals 29, 30 is the same as that of the small cylinders. 23 and 24 (G<D) and larger than the inner diameter H of the through hole 16 (G>H), and when the ring seals 29 and 30 are separated from the stepped portions 27 and 28, the ring Oil flows on the outside of the ring seals 29, 30 through small gaps 31, 32 formed on the outer peripheral surfaces of the seals 29, 30 to allow oil to flow, so that the input chambers 7, 8 and the output chambers 9, 10 are communicated with each other. It is configured.

Balance springs 33 and 34 made of compression coil springs are compressed between both ends of the center sleeve 15 and the left and right ring seals 29 and 30 to hold the center sleeve 15 at the center position.

The plungers 35, 36 are composed of heads 37, 38, body parts 39, 40, and bases 41, 42, and the heads 37, 38 are inserted into the through hole 16 by seal cups 43, 44 and oil seals 45, 46. It is supported in a liquid-tight and slidable manner. Flange portions 47 and 48 having an outer diameter F larger than the inner diameter H of the through hole 16 (H<F) are provided in the body portions 39 and 40,
The base parts 41 and 42 are slidably inserted and supported in the small cylinders 23 and 24, but the base parts 41 and 42
The peripheral surfaces of the ring seals 29 and 30 are slightly shaved to form cylindrical portions 49 and 50. Note that the outer diameter E of the cylindrical portions 49 and 50 is equal to that of the ring seals 29 and 30.
(E>G), and stepped surfaces 51, 52 facing the ring seals 29, 30 are formed between the body parts 39, 40 and the cylindrical parts 49, 50.

There are oil holes 5 inside the plungers 35 and 36.
3, 54 are provided, and the oil passage holes 53, 54
are open between the oil seals 45, 46 of the heads 37, 38 and the seal cups 43, 44, at the outer end surfaces of the bases 41, 42, and in the cylindrical portions 49, 50.
A center spring 17 is compressed in the gas chamber formed between the left and right plungers 35 and 36, and the outer end surfaces of the bases 41 and 42 are connected to the small cylinder 2.
It is configured to be pressed against the hole bottoms of the bottom chambers 57 and 58 of No. 3 and 24. Incidentally, grooves 55 and 56 having arbitrary shapes are provided on the outer end surfaces of the bases 41 and 42. Further, if A is the distance between the left and right plungers 35 and 36, B is the distance between the flanges 47 and 48 and the center sleeve 15, and C is the distance between the end surface of the center sleeve 15 and the sealing surface of the gaskets 25 and 26, A+C <B.

Next, the action will be explained.

The brake pedal is depressed and the 1st and 2nd ports 1,
The pressure oil sent from No. 2 to input chambers 7 and 8 is sent to No. 3,
The oil is sent to the 5th and 6th ports 5 and 6 through the gap between the ring seals 29 and 30 and the step surfaces 51 and 52, and the oil is sent to the 5th and 6th ports 5 and 6.
3 and 54, and is sent to bottom chambers 57 and 58.

When the oil pressure in the bottom chambers 57, 58 rises together with the oil pressure in the output chambers 9, 10, the plungers 35, 36 are pushed inward against the elasticity of the center spring 17, causing the step surfaces 51, 52 to contact the ring seals 29, 30. Let them come into contact with you.

When the oil pressure in the input chambers 7 and 8 further increases, the oil pressure in the bottom chambers 57 and 58 is lost and the ring seals 29 and 3
0 and the step surfaces 51 and 52 are opened and the output chambers 9 and 10 are opened.
The oil pressure inside rises again.

When the oil pressure in the input chambers 7 and 8 drops, the base 4
1 and 42, the ring seals 29 and 30 are pushed away from the stepped portions 27 and 28, allowing the pressure oil in the output chambers 9 and 10 to flow through the small gaps 31 and 32 on the outer peripheral surfaces of the ring seals 29 and 30. Return to input rooms 7 and 8. Then, the stepped surface 5 for the ring seals 29 and 30
1 and 52 perform proportional depressurization by repeatedly engaging and separating.

If the system in either input chamber 8 or 7 fails, the center sleeve 15 moves toward the input chamber 8 or 7 due to the pressure oil in the input chamber 7 or 8, and the oil seals 45, 46 and seal cups 43, 44
An oil passage hole 53 or 54 located between the input chamber 7 or 8 communicates with the input chamber 7 or 8. Therefore, the input chamber 7 or 8 is connected to the output chamber 9 or 1 through the oil passage hole 53 or 54.
0 and stops proportional depressurization.

As described above, the brake hydraulic pressure control valve device according to the present invention includes a main cylinder 14 and small cylinders 23 and 24 that are coaxially disposed in the valve case 13 and are connected to both ends of the main cylinder 14, and a center sleeve 15 is attached to the main cylinder 14. The ring seals 29, 30 are slidably and liquid-tightly fitted and supported, and are fitted into the stepped portions 27, 28 formed between the main cylinder 14 and the small cylinders 23, 24.
The inner diameter G is smaller than the inner diameter D of the small cylinders 23 and 24 (G<D) and larger than the inner diameter H of the through hole 16 of the center sleeve 15 (G>H),
Micro gaps 31, 32) are provided on the outer peripheral surfaces of the ring seals 29, 30 to allow oil to flow, and the center sleeve 15
A balance spring 33 made of a compression coil spring is provided between both ends of the ring seal 29, 30 and the left and right ring seals 29, 30.
34 is compressed to store the center sleeve 15 in the central position, and the head parts 37, 38 and the body part 3 are
The heads 37, 38 of the plungers 35, 36, consisting of the bases 41, 42, are slidably and liquid-tightly inserted into the through hole 16 by the seal cups 43, 44 and the oil seals 45, 46. Supporting ring seals 29, 30 in the body parts 39, 40
(G<F) collar portion 4 having an outer diameter larger than the inner diameter of
7 and 48 are provided, and the cylindrical portion 4 is provided near the body portions 39 and 40.
The base portions 41 and 42 having the cylindrical portions 49 and 50 are slidably inserted into and supported within the small cylinders 23 and 24, and the outer diameters of the cylindrical portions 49 and 50 are sealed with ring seals 29 and 3.
0 (E>G), and the body 3
Step surfaces 51, 52 facing the ring seals 29, 30 are formed between the cylinder parts 49, 50 and the peripheral surfaces between the seal cups 43, 44 of the heads 37, 38 and the oil seals 45, 46 and the cylinder. An oil hole 5 connecting the peripheral surfaces of the portions 49 and 50 and the outer end surfaces of the base portions 41 and 42
3, 54, and left and right planshears 35, 36.
Center spring 1 is placed in the gas chamber formed by
7 is contracted, and left and right plungers 35, 36
If the distance between them is A, the distance between the flanges 47, 48 and the center sleeve 15 is B, and the distance between the end surface of the center sleeve 15 and the sealing surface of the packings 25, 26 is C, then A+C<B. It is something.

The device of the present invention has a simpler structure and higher reliability than conventional hydraulic control valve devices of this type.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of this invention. 1-6...port, 7,8...input room, 9,1
0...Output chamber, 11...Valve box, 12...Plug,
13...Valve case, 14...Main cylinder, 15
...Center sleeve, 16...Through hole, 17...
...Center spring, 21, 22...Pressure reducing valve mechanism, 23, 24...Small cylinder, 25, 26...
... Patsukin, 27, 28... Danbe, 29, 30...
...Ring seal, 31, 32...Minute gap that allows oil to flow, 33, 34...Balance spring, 35,
36...Plunger, 37,38...Head, 3
9,40...Body part, 41,42...Base part, 43,
44... Seal cup, 45, 46... Oil seal, 47, 48... Flange section, 49, 50... Cylindrical section, 51, 52... Step surface, 53, 54... Oil passage hole, 55, 56... ...concave groove, 57, 58...bottom chamber,
A... Distance between the left and right plungers, B... Distance between the flange and the center sleeve, C... Distance between the end surface of the center sleeve and the sealing surface of the packing.

Claims (1)

[Scope of utility model registration request] A main cylinder 14 and small cylinders 23 and 24 continuous to both ends thereof are coaxially provided in the valve case 13, and a center sleeve 15 is provided in the main cylinder 14.
The main cylinder 1 is slidably and liquid-tightly fitted and supported.
Ring seals 29, 3 are attached to the stepped portions 27, 28 formed between the small cylinders 23, 24
0, and the inner diameters of the ring seals 29, 30 are smaller than the inner diameters of the small cylinders 23, 24 and larger than the inner diameter of the through hole 16 of the center sleeve 15. Gaps 31 and 32 are provided, and balance springs 33 and 34 made of compression coil springs are compressed between both ends of the center sleeve 15 and the left and right ring seals 29 and 30 to hold the center sleeve 15 in the center position. The heads 37, 38 of the plungers 35, 36, which consist of the heads 37, 38, the body parts 39, 40, and the bases 41, 42, are connected to seal cups 43, 44 and oil seals 45, 4.
6 in a liquid-tight and slidable manner in the through hole 16, and ring seals 29, 29 in the body portions 39, 40.
Flange portions 47, 4 having an outer diameter larger than the inner diameter of 30
8 is provided, and cylindrical parts 49, 5 are provided near the body parts 39, 40.
0 bases 41, 42 with small cylinders 23,
The cylinder parts 49, 50 are slidably inserted and supported in the ring seals 24, and the outer diameters of the cylinder parts 49, 50 are formed larger than the inner diameters of the ring seals 29, 30.
Step surfaces 51 and 52 facing the ring seals 29 and 30 are formed between the circumferential surfaces between the seal cups 43 and 44 of the heads 37 and 38 and the oil seals 45 and 46 and the circumferential surfaces of the cylindrical portions 49 and 50. Surface and base 41, 42
The center spring 17 is compressed in the gas chamber formed by the left and right plungers 35, 36, and the spacing between the left and right plungers 35, 36 is A, Part 4
The distance between 7, 48 and the center sleeve 15 is B,
The end face of the center sleeve 15 and the packing 25, 2
6 If the distance between the seal surfaces is C, then A+C<B
A hydraulic pressure control valve device for a brake, characterized in that it is configured as follows.