Fluid handling – Systems – Supply and exhaust
Patent
1994-10-20
1996-12-31
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
91448, 13759616, 13759617, 3031192, F15B 13044
Patent
active
055884636
DESCRIPTION:
BRIEF SUMMARY
The present invention is in the field of systems for controlling and regulating the pressure in hydraulic circuits, and relates more particularly to a module which can be used in such systems.
In the majority of hydraulic installations, it is necessary to cause the hydraulic pressure to vary in a pressure receiver device, in response to a control signal. The pressure receiver may consist, for example, of a hydraulic cylinder actuator or of a hydraulic motor, and the control signal may, for example, be mechanical, hydraulic or electrical.
Documents EP-A-0,369,412 and GB-A-2,215,416 describe such modules for controlling hydraulic pressure, in which the pressure receiver is a motor vehicle brake motor and the control signal is electrical. These systems exhibit the major drawback of a very high electrical consumption.
Document EP-A-0,452,173 has proposed a module for controlling pressure in a hydraulic circuit, comprising a generator of pressurized fluid, a reservoir of low pressure fluid, and a pressure receiver, the module including a solenoid valve including an electric coil and a movable magnetic core plunger controlling the position of a distributor slide valve sliding in a bore formed in a body, the bore communicating with a feed passage connected to the generator of pressurized fluid, a distribution passage connected to the pressure receiver, and a pressure relief passage connected to the reservoir of low pressure fluid, the slide valve comprising a hydraulic enclosure determining a reaction force which opposes the force generated by the coil, and the distribution passage being placed in communication, selectively, with the feed passage or with the pressure relief passage by the distributor slide valve.
Such a module, by virtue of the use of a proportional solenoid valve and of a hydraulic reaction enclosure, makes it possible to reduce considerably the electrical power consumption of the solenoid valve of the control module. However, this module is unsuitable for some applications such as high volume hydraulic circuits for example, in which the module must control high flow rates of fluid of high pressure. In the application example mentioned above, such a case arises when the module controls the hydraulic braking of a utility vehicle.
Consequently, the object of the present invention is to propose a module for controlling the pressure in a hydraulic circuit, the electrical power consumption of which is as small as possible, which can provide high flow rates of fluid at a high pressure, and the operation of which is reliable, the design of this module moreover being simplified so as to obtain a low cost.
This object is achieved, according to the invention, by arranging a controlled valve delivering the pressurized fluid coming from the generator into the feed passage when the movable magnetic core plunger actuates the distributor slide valve.
Other objects, characteristics and advantages of the present invention will emerge from the description which will now be given of one exemplary embodiment given without limitation and with reference to the appended drawing in which: embodiment of a control module in accordance with the present invention.
The figure shows a diagrammatic section of a control module, denoted overall by the reference 100, arranged in a hydraulic circuit comprising a generator of pressurized fluid 110, a reservoir of low pressure fluid 120, and a pressure receiver 130.
The module 100 consists of a body 10 on which is fixed in leaktight fashion a coil 12 of a proportional-type solenoid valve. It is known that the coil of solenoid valves of this type has the essential feature of being capable of providing a substantially constant force for a given current in a not inconsiderable range of displacement of the magnetic core plunger, of the order for example of 2 to 3 mm. This feature is put to good use in the present invention to fulfil the required function by modulating the current flowing in the coil 12.
The coil 12 interacts with a movable magnetic core plunger 14 equipped with a push
REFERENCES:
patent: 4741364 (1988-05-01), Stoss et al.
patent: 5191827 (1993-03-01), Kervagoret
AlliedSignal Europe Services Technique
McCormick Jr. Leo H.
Michalsky Gerald A.
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