JPS6313858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a skid control device for an automobile brake system, which comprises at least two pressure-controlled main valves and one pilot solenoid provided for each main valve. and the pilot solenoid valve is disposed below the main valve, all the main valves and the pilot solenoid valves are incorporated in one common casing, and all the main valves and the pilot solenoid valve are arranged under the main valve. The invention relates to a type in which the atmospheric connection common to the solenoid valves is arranged on the underside of the casing.

A skid control device of this type is already known (DE-A-2739513). This skid control device has the disadvantage that the valve body of the main valve is not guided with sufficient precision, which prevents the main valve from closing reliably, resulting in leakage and, in turn, impeding the operation of the skid control device. .

It is an object of the present invention to improve the known skid control device described above so that no leakage occurs when the main valve is closed.

An object of the present invention is to provide a skid control device of the type mentioned at the outset, in which an opening/closing piston for actuating the valve body of the main valve has a piston rod movably holding the valve body of the main valve at its free end; This was achieved by including a guide member provided on the piston rod and guided along the guide portion of the casing.

According to the present invention, the valve body of the main valve is accurately guided, and since the valve body is movably held by the piston rod, the valve body completely contacts the valve seat, and the main valve is closed. There will be no leakage, so
The perfect functioning of the skid control device is guaranteed.

The invention will now be explained with reference to the illustrated embodiment.

The skid control device is connected to the brake line 1, 1', 1'' between one brake valve 2 and the two axle brake cylinders 3, 4. , 8, and an electronic control device 10. The electronic control device 10 includes the sensors 5, 6 and three pilot solenoid valves 11, 1.
2 and 13 are connected. Of the three pilot solenoid valves 11, 12, 13, only two pilot solenoid valves 11, 12 are shown in the drawing;
The third pilot solenoid valve 13 is located behind the pilot solenoid valve 11.

The three pilot solenoid valves 11, 12, 13 are 3
It controls two main valves 14 (the two main valves are not shown), and is arranged in a common casing 17 together with the three main valves 14, forming a so-called pressure control valve unit. The casing 17 mainly consists of two casing parts, namely a casing upper part 18 and a casing lower part 19, the casing upper part 18 and the casing lower part 19 having a plurality of screws 2.
They are mutually connected by screw connection using 0.

The three pilot solenoid valves 11, 12, 13 have a housing 21, 22, 23, each of which is provided with a mounting surface. At this mounting surface, casing 2
1, 22, 23 are the lower surface 24 of the casing upper part 18
The casing upper part 18 and the casing lower part 19 are fixed by being screwed together. The valve stems 25, 26, 27 of the pilot solenoid valves 11, 12, 13 extend upward through the mounting surfaces of the casings 21, 22, 23,
A valve seat 31,
Valve bodies 28, 29, 30 are provided which cooperate with 32, 33. Each valve body 28, 29, 30 is the main valve 1
Passage 40 leading to work chamber 37 of No. 4 and bleed air passage 3
4, 35, and 36.

The upper part 18 of the casing has an inlet connection 43 for the brake conduit 1, and this inlet connection 43 is provided with an extension hole 44 into which the bleed passages 34, 35, 36 open. There is. The connection with the atmosphere is from the working chamber 37 of the main valve 14 to the casing 17 through the passage 40 and the casings 21, 22, 23 of the pilot solenoid valves 11, 12, 13.
This is done at a common atmospheric connection 45 provided on the underside of the . This atmospheric connection 45 is constructed as a check valve that opens outward.

Three main valves (only one shown in the drawing) 1
4 axes are located horizontally and at an angle with respect to each other, and the first and second main valves are located opposite each other on one common axis and the axis of the third main valve is at an angle with respect to the third main valve. The first and second main valves are arranged perpendicularly to a common axis of the first and second main valves. A very compact construction of the valve unit is obtained in this way. Furthermore, it is advantageous in this case for the axis of one main valve to be arranged higher than the axes of the other two main valves, so that the condensed water in the valve unit can be discharged in a downward direction. The main valve 14 is arranged in a housing recess 46 which is closed off to the outside by a cover 49 .

The main valve 14 has a valve body 72 configured as a valve plate that cooperates with two valve seats 57 and 58 . The valve body 72 is brought into contact with one of the valve seats 58 by the action of a spring 59. The valve body 72 is held by a spherical free end 73 of a piston rod 74, which is connected to an opening/closing piston 75 in contact with the diaphragm 56. The piston rod 74 has a guide member 76, which is composed of four guide ribs. This guide rib is guided along a recess 77 in the housing and is centrally received in this recess 77.

Next, the operation of the skid control device of the present invention will be explained.

During normal braking operation, the brake air flows freely from the brake valve 2 via the brake conduits 1, 1', 1'' to the axle brake cylinders 3, 4. In this case, the brake air is configured as a 3-port, 2-position valve. It reaches one of the wheel brake cylinders 3 and 4 through the main valve 14 and one of the other two main valves, respectively.

If one wheel, for example the wheel 7 with the wheel brake cylinder 3, is braked too much, that is to say if the wheel 7 is locked, the skid control is activated and the pilot solenoid valves 11 and 12 are switched over. As a result, the main valve 14 is switched, the connection from the brake conduit to the wheel brake cylinders 3 and 4 is cut off, and the connection between the main valve 14 and the wheel brake cylinders 3 and 4 is connected to the atmosphere and simultaneously locked. The main valve belonging to the wheel 8 that is not closed is switched to the closed position. As a result, the pressure in the wheel brake cylinder 4 belonging to the unlocked wheel 8 is maintained, whereas braking air is released into the atmosphere from the wheel brake cylinder 3 belonging to the locked wheel 7. . When the pressure in the wheel brake cylinder 3 has been reduced to a predetermined value, all pilot solenoid valves 11, 12, 13 are switched once more. As a result, the main valve 14 is switched again to the position connecting the brake conduit with the wheel brake cylinders 3, 4, the main valve of the wheel brake cylinder 4 belonging to the unlocked wheel 8 is opened, and the main valve of the wheel brake cylinder 4 belonging to the unlocked wheel 8 is opened, and the main valve of the wheel brake cylinder 4 belonging to the unlocked wheel 8 is opened. The main valve of the wheel brake cylinder 3 belonging to the wheel is closed again. The pressure in the wheel brake cylinder 4 belonging to the unlocked wheel 8 thus continues to rise, whereas the pressure in the wheel brake cylinder 3 belonging to the locked wheel 7 remains at a reduced pressure. Then, after a predetermined period of time has elapsed, the pilot solenoid valve 13 of the main valve of the wheel brake cylinder 3 of the locked wheel 7 is switched again, and the main valve of the wheel brake cylinder 3 is opened again. As a result, the reduced pressure in the wheel brake cylinder 3 is raised again by connecting and disconnecting the pilot solenoid valve 13.

The guide member 76 serves to guide the valve body 72 flawlessly during the switching movements of the main valve 14 .
The guide point between the guide element 76 and the recess 77 is provided in a part of the casing that is virtually impermeable to dirt or water. This guide point is not located in the flow area of the brake air. Burn-in of the guide points is therefore avoided. Also, if the valve seat surface is not exactly perpendicular to the guiding direction, the valve body 72 can make a small pivoting movement and come into tight contact with the valve seat despite being accurately guided.

[Brief explanation of the drawing]

The drawing shows one of the skid control devices of the present invention.
It is a schematic diagram showing an example. 1, 1', 1''... Brake conduit, 2... Brake valve, 3, 4... Wheel brake cylinder, 5, 6
...Sensor, 7, 8...Wheel, 9...Axle, 10
...Electronic control device, 11, 12, 13...Pilot solenoid valve, 14...Main valve, 17...Casing, 18...Casing upper part, 19...Casing lower part, 20...Screw, 21, 22, 23 ...Casing, 24...Bottom surface, 25, 26, 27...
Valve stem, 28, 29, 30... Valve body, 31, 32,
33... Valve seat, 34, 35, 36... Bleed passage,
37... Working chamber, 40... Passage, 43... Inlet connection part, 44... Extension hole part, 45... Atmosphere connection part,
46...Casing notch, 49...Cover, 5
6...Diaphragm, 57, 58...Valve seat, 59
... Spring, 72 ... Valve body, 73 ... Free end, 7
4... Piston rod, 75... Opening/closing piston, 76
...Guide member, 77...Notch.

Claims (1)

[Scope of Claims] 1. A skid control device for an automobile brake system, which comprises at least 2 pressure-controlled skid control devices.
The main valve has two main valves and one pilot solenoid valve provided for each main valve, and the pilot solenoid valve is disposed below the main valve, and all the main valves and the pilot solenoid valve are incorporated in one common casing, and the atmospheric connection common to all the main valves and pilot solenoid valves is arranged on the underside of the casing, the valve body of the main valve 14 An opening/closing piston 75 for operating the main valve 72 is provided with a piston rod 74 movably holding the valve body 72 of the main valve 14 at its free end 73, and a piston rod 74 that is guided along the guide portion of the casing 17. A skid control device characterized in that it has a guide member 76 that is guided by a guide member 76. 2. The guide member 76 is formed of a plurality of guide ribs that are integrally formed with the piston rod 74 and centered within a notch 77 provided in the casing 17 following the valve seat 58 of the main valve 14. , a skid control device according to claim 1. 3 The valve body 72 of the main valve 14 is connected to the piston rod 74
2. The skid control device according to claim 1, wherein the skid control device is configured as a valve plate movably connected to the free end 73 of the valve plate.