Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1986-04-07
1988-01-05
Cohan, Alan
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60431, F15B 1116
Patent
active
047167270
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a hydraulic device in accordance with the type of the main claim. In order to economically operate hydraulic devices it is known to set the pump in such a manner that it provides the pressure and the feeding flow required by the consumer. For this purpose the load pressure being present in the consumer is fed to a flow control valve which, for example, controls a setting means for the pump in such a manner that the aforementioned requirement is met. Such known devices and equipments are expansive, on the one hand, since a variable pump must be used, or they do not operate at an economic optimum.
In order to simplify such devices it had been already suggested to control the speed of the pump in such a manner that it meets the aforementioned requirements. For this purpose a pressure control valve is provided which generates a control pressure adjusting a variable cylinder for a speed regulator of an internal combustion engine driving the pump. However, difficulties were encountered with respect to the oscillation characteristics of the pressure control valve and therefore with respect to the control of the speed regulator. This resulted in that a practical operation of such a device could not be performed.
ADVANTAGES OF THE INVENTION
In contrast thereto, the hydraulic device in accordance with the invention and with the characterizing features of the main claim is advantageous in that it is designed relatively simple permitting a use without any problems and in a very economical manner.
Further embodiments and improvements of the features stated in the main claim are possible by the measures stated in the subclaims.
DRAWING
Two exemplified embodiments of the invention are illustrated in the drawing and are explained in detail in the subsequent description. The drawings illustrate in FIGS. 1 and 2 hydraulic devices in a schematic illustration, FIG. 3 a diagram
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
A non-variable pump is designated with 10 in FIG. 1, which draws in a pressure medium from a container 11 and displaces it into a feed line 12. Pump 10 is driven by an internal combustion engine 13, in particular a Diesel engine, whose member 14 determining the fuel supply, in a Diesel motor the injection pump or the speed regulator thereof, is set by means of an hydraulically admitted set cylinder 15. The same is admitted with pressure medium through a line 16 which leads to a valve control block 17. In the same three wayvalves 18 to 20 are successively disposed, whereby the wayvalve 18 controls a simgle acting consumer, however the wayvalves 19,20 double acting consumers.
The feed line 12 also leads to the control block 17. A neutral circulating line 12A is connected thereto which starts from an end plate 22 closing the control block and ends on a pressure limiting valve 23. From there a line 24 extends to a return flow line 25 which also extends through the control block 17. A line 26 branches from feed line 12 in control block 17 extending to the pressure limiting valve, furthermore a line 27 extending to a pressure control valve 28, a line 29 extending to wayvalve 18, a line 30 extending to wayvalve 19 and a line 31 extending to wayvalve 20. A first line 32 extends from wayvalve 18 to a nonillustrated single acting consumer, a second line 33 to line 16 and a line 34 to a line 35 which extends from the return flow line to the discharge side of the pressure control valve 28. A line 37 branches from line 38 extending to the one front face 28A of the pressure control valve 28, whereby a control spring acts on the opposite front face 28B. A throttle 39 is disposed in line 33 in the proximity of the discharge into line 16. The pressure control valve 28 provides a connection, dependent on its position, either to line 16 by means of line 27 being connected with feed line 12 or to line 35 which is connected with the return line 25. The pressure control valve 28 is controlled by the liquid pressure acting to its front face 28 A against the force of spring 38.
The w
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patent: 3214901 (1965-11-01), Iverson
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patent: 4118149 (1978-10-01), Hagberg
patent: 4334408 (1982-06-01), LePointe
Cohan Alan
Robert & Bosch GmbH
Striker Michael J.
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