Fluid handling – Systems – Multi-way valve unit
Patent
1997-09-18
1999-06-22
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
29890127, 1375962, F15B 13043
Patent
active
059133333
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a hydraulically actuatable directional control valve, particularly a directional proportional control valve, which is to be controlled by electromagnetically actuated pilot valves of small nominal sizes.
In connection with these valves, it is known to fasten the pilot valves of small nominal size having a housing of their own to the lateral end surfaces of the housing of the directional control valve and to establish the hydraulic connection and of these pilot valves with the tank and pressure connection with the directional control valve via bored channels in the housing of the directional control valve. Since the connection pattern of the known pilot valves of small nominal size has results in connecting channels of small diameter at a slight distance from each other, the introduction of these connecting channels in the form of bore holes requires a considerable manufacturing expense. Instead of pilot valves which are fastened to the side of the housing of the directional control valve, it is also known to develop the pilot valves as insertion cartridges and screw them into the housing of the directional control valve parallel to the actuation axis of the servo-piston of the directional control valve and to connect the pilot valves hydraulically to the directional control valve by separate bore holes in the housing of the directional control valve. Such a development and arrangement of the pilot valves in the housing of the directional control valve requires expensive production of the connecting bore holes, particularly as they must close in pressure-tight fashion, without leakage towards the outside.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to create a development and arrangement of the pilot valves on the directional control valve which assures an inexpensive manufacture of the directional control valve with pilot valves, particularly in the case of mass production.
According to the invention, due to the fact that the hydraulic connecting of the pilot valves developed as insertion cartridges to the directional control valve is effected via channels cast in the housing of the directional control valve and the connections of the insertion cartridges of each pilot valve are adapted to the geometry of the cast channels, inexpensive mass production of these valves can, in particular, be obtained in a simple manner.
BRIEF DESCRIPTION OF THE DRAWINGS
With the above and other objects and advantages in view, the present invention will become more clearly understood in connection with a detailed description of the sole FIGURE showing in cross-section an embodiment of a hydraulically actuatable directional control valve in accordance with the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the sole FIGURE of the drawing, 1 is the cast-iron housing of the directional control valve which contains a servo-piston 3 in a passage bore hole 2. The servo-piston is fixed at its end sides 3a, 3b by springs 4, 5 in the initial position shown. The ends of the springs facing away from the servo-piston rest against hollow closure screws 6, 7. The ends of the servo-piston define control spaces 8, 9 which can be acted on by control liquid and are connected via channels 10, 11 to the corresponding outlet spaces 12, 13 of the electromagnetically actuatable pilot valves 14, 15 which are developed as insertion cartridges. The pilot valves are developed as pressure control valves and screwed into corresponding recesses 16, 17 in the cast-iron housing 1.
The control pressure acting in the control spaces 8, 9 displaces the servo-piston 3 against the force of the corresponding springs 4, 5, the consumer connecting channel 20 being connected either to the pump connection P or to the tank connection T, depending on the direction of displacement of the servo-piston. The actuation axes 21, 22 of the pilot valves extend parallel to each other and perpendicular to the actuation axis 23 of the servo-piston 3. As a
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patent: 4290447 (1981-09-01), Knutson
patent: 4357955 (1982-11-01), Sauer
patent: 4569273 (1986-02-01), Anderson et al.
patent: 5372060 (1994-12-01), Maruyama et al.
patent: 5394903 (1995-03-01), Tominaga
Biener Rainer
Rauscher Richard
Rub Winfried
Farber Martin A.
Mannesmann Rexroth AG
Michalsky Gerald A.
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