Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1993-02-15
1994-07-12
Gluck, Richard E.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417 62, F01C 1344, F04C 2344, F04C 18344
Patent
active
053283376
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a hydraulic power system, and more specifically, to a hydraulic power system which has a rotor having vanes movable relative thereto. The system is specifically adapted for low to medium pressure applications.
In many applications it is desirable that a power system operate under low to medium pressure, can be slow running, and has a high torque. An example of one such system is a hydraulic motor or winch used in the fishing industry for load lifting and lowering, net hauling and like operations. Preferably those motors have a great variation in rotational speed in both direction, an increase in torque output to match in increase in load, automatic stalling at high load, automatic paying-out when the stalling load is excuded, and automatic hauling in when the load is lower than the stalling load. It is also important that the motors have easy and flexible operation with a minimum of controls, are not subjected to shock loading when changing directions and are of sturdy construction.
Clearly there are many different applications for a hydraulic power system, but it is an object of this invention to provide a power system which is capable of satisfying at least some of the above requirements.
According to the invention there is provided a hydraulic power system comprising a stator having a central cavity with a wall of non-circular cylindrical shape, a rotor rotatably mounted in said cavity, a plurality of slots formed in said rotor, said slots being evenly spaced around the periphery of the rotor and said slots extending radially inwards from the periphery of the rotor, a vane located in each of said slots, said vanes being slidable in said slots between outwards and inwards positions, said vanes having an outer edge arranged to be in contact with said wall, guide means being fixed relative to said stator for positively displacing said vanes as said rotor rotates in use, said guide means being arranged to keep said outer surface of said vanes in sliding contact with said wall during said rotation, and at least two fluid passages extending into said cavity through which operating fluid can be introduced into and removed from said cavity.
An embodiment of the invention is described in detail in the following passages of the specification which refer to the accompanying drawings. The drawings, however, are merely illustrative of how the invention might be put into effect, so that the specific form and arrangement of the various features as shown is not to be understood as limiting on the invention.
In the drawings:
FIGS. 1 and 1A are end and side views respectively of a motor according to the invention, the end view being shown with one end plate removed such that the internal arrangement of components can be viewed.
FIGS. 2 and 2A are side end views respectively of a rotor for the motor of FIG. 1.
FIG. 3 shows an end plate for the motor of FIG. 1 wherein the passages through that end plate are depicted by dotted lines.
FIG. 4 shows a plan view of a by-pass valve for the motor of FIG. 1, and FIG. 4A shows how that by-pass valve connects to a selector valve.
FIGS. 5 and 5A show a diagrammatic perspective view of a mode variation valve and its chamber, respectively, for the motor of FIG. 1.
FIGS. 6 and 7 show diagrammatic end views of the mode variation valve in two different operational modes.
FIGS. 8 and 8A show a diagrammatic perspective view of a selector valve and its chamber, respectively, for the motor of FIG. 1.
FIGS. 9 and 9A show in diagrammatic form, the selector valve and motor operating in parallel and series mode, respectively.
FIGS. 10 to 14 show five different positions of the selector valve for the motor in parallel mode of operation; and
FIGS. 15 to 19 show the selector valve in five different positions with the motor in the series mode of operation.
Referring initially to FIGS. 1 and 1A, a hydraulic motor comprises a stator 1 having a central cavity 2 in which a rotor 3 rotates in use. The wall of the cavity 2 in the stator 1 is of cylindrical form having a twin cente
REFERENCES:
patent: 1666466 (1928-04-01), Peters
patent: 3788770 (1974-01-01), Johnson et al.
patent: 4913102 (1990-04-01), Ohmura et al.
patent: 4963080 (1990-10-01), Hansen
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