Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Three or more cylinders arranged in parallel – radial or...
Patent
1999-03-10
2000-09-12
Ryznic, John E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Three or more cylinders arranged in parallel, radial or...
60419, 417225, 91472, F01B 100, F16D 3102
Patent
active
061161381
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulic pressure transformer in accordance with the preamble of claim 1.
Such a hydraulic pressure transformer is known from U.S. Pat. No. 4,077,746, Reynolds, in which a hydraulic pressure transformer is used to load a hydraulic accumulator with hydraulic fluid of a higher pressure than the pressure of the hydraulic fluid supplied to the hydraulic transformer. In the known hydraulic pressure transformer, the rotational speed of the rotor is limited by a flow restricting orifice.
Due to this flow restricting orifice, the pressure in a first port is lowered so that the pressure differences over the first port and a second port is in inverse ratio to the length of this first port and the length of the second port. This lowering of pressure over the orifice brings a loss of energy and reduces the efficiency, however, it is clear that in the known apparatus such flow restrictions are the only way to adapt to the varying pressure differences. The objective of the invention is to make a hydraulic pressure transformer with which fluid flows of a first pressure can be converted almost without loss of power into a fluid flow of a second pressure, whereby the first and/or the second pressure may vary indepedently.
In accordance with the invention, adjusting means are provided for adjusting the rotative position of the drive means with respect to an opening position of the valves.
By adjusting the position of the drive means relative to the opening positions of the valves, the first pressure and/or the second pressure can be varied independently without loss of power.
From U.S. Pat. No. 5,035,170 a hydraulic apparatus is known with varying displacement capabilities by means of electrically rotating a port plate with two slots that cooperates with the cylinders in the hydraulic apparatus. The aim of rotating the port plate is to vary displacement of the hydraulic apparatus, which aim is different from the problem solved with the apparatus according to the invention.
In accordance with a further improvement of the invention, the rotative position of the drive means is adjustable with respect to the housing and the opening position of the valves is fixed with respect to the housing by the adjusting means. This embodiment permits the construction to be simple and affords a quickly reacting adjustment of the pressure ratios; this is partly due to the fact that relatively little force is required for the adjustment, as only the forces in the valves play a role and these forces are much weaker than the forces involved with, for instance, the drive means. This vastly increases the response speed, something that is very important for many applications.
According to an embodiment of the invention, the chambers connect via one of at least three channels through a face plate with one of the pipe connections and the rotative position of the face plate in the housing is adjustable. By using an adjustable face plate with channels each connected to one of the pipe connections easy and quick adjustable valves are provided.
In accordance with a further improvement, the face plate in the housing is rotatable with the aid of the adjustment means, thereby making quick adjustments possible with little power requirement.
According to another improvement of the hydraulic pressure transformer in accordance with the invention in which the adjusting means are directed by a control and which is connected to a hydraulic motor, the control is connected to a pressure sensor placed in the pipe connection between the hydraulic motor and the hydraulic pressure transformer.
In this way the control can immediately adjust the setting of the hydraulic pressure transformer to match the motor load, thereby preventing that due to the altered pressure ratio the rotor rotates too quickly or stops, either of which would result in undesirable operating conditions.
Further the invention relates to an improvement of a hydraulic pressure transformer in which the face plate has three channels between which a rib is provided, which rib d
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Innas Free Piston B.V.
Myers Jeffrey D.
Ryznic John E.
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