US 2003/0110765 A1 · Digital controlled fluid translating device

Abstract

The displacement of fluid translating devices are normally controlled by changing the angle of an eccentric or a cam plate to change the pumping stroke of the pistons within the device. In the subject arrangement, the displacement of the fluid translating device is controlled by controlling the flow being delivered into or away from each of the associated pressure chambers defined therein by the respective ones of a plurality of pistons. By not permitting the flow from every piston to be directed into useful work, the volume of fluid being directed into or away from the fluid translating device can be altered. Likewise, the direction of fluid flow within the fluid translating device can be selectively changed thus permitting the subject fluid translating device to be capable of pumping or motoring in both directions of flow relative to the first and second inlet/outlet ports thereof.

Claims23

Dependent claims

A variable displacement fluid translating device, comprising:

a housing having first and second inlet/outlet ports and defining a reference axis therethrough
a rotating cam disposed in the housing along the reference axis and having a cam surface;
a plurality of piston bores defined in the housing about the reference axis and each bore of the plurality of piston bores having a bottom portion;
a plurality of pistons slideably disposed in the plurality of piston bores and selectively in mating contact with the cam surface of the rotating cam;
a plurality of pressure chambers defined in the housing between the respective one of the plurality of pistons and the bottom portion of the respective ones of the plurality of piston bores;
and
a valving arrangement connected between selected pressure chambers of the plurality of pressure chambers and the respective first and second inlet/outlet ports and being operative to selectively control displacement and the direction of fluid flow in each pressure chamber relative to the first and second inlet/outlet ports.

4 more elements

A method of controlling the displacement and the flow direction of fluid within a variable displacement fluid translating device between first and second inlet/outlet ports thereof, comprising the steps:

providing a housing having first and second inlet/outlet ports and a reference axis;
providing a rotating cam having a cam surface in the housing along the reference axis;
forming a plurality of piston bores in the housing about the reference axis;
providing a plurality of pistons in the plurality of piston bores that are slideably disposed in the respective piston bores and that are selectively in mating contact with the cam surface of the rotating cam;
establishing a plurality of pressure chambers between the respective one of the plurality of pistons and the respective ones of the plurality of piston bores;
and
providing a valving arrangement between selected pressure chamber of the plurality of pressure chambers and the respective first and second inlet/outlet ports, each valving arrangement being operative to selectively control the displacement and the flow direction in each pressure chamber relative to both of the first and second inlet/outlet ports.

4 more elements

Dependencies are inferred from the claim text.

Digital controlled fluid translating device

Life of this patent

Digital controlled fluid translating device

Life of this patent

Abstract

Claims23