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US 4,787,828 AGranted
Power transmission
AssigneeVickers, Incorporated
InventorsJean J. Schweitzer, Howard J. Sculthorpe
Life of this patent
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AssigneeVickers, Incorporated
InventorsJean J. Schweitzer, Howard J. Sculthorpe
Estimating the term…
A reversible power transmission unit comprising a housing and a cam block rotatably mounted in the housing and a pumping mechanism associated with opposed inclined surfaces of the cam block. A common shaft is rotatably mounted in the cam block and has its ends extending beyond the cam block. Each pumping mechanism includes a cylinder barrel mounted on the shaft for rotation with the shaft and having a plurality of cylinders with pistons slidable therein and operatively associated with a surface of the cam block. Each cylinder has a port opening to a valve plate provided with inlet and outlet ports in communication with inlet and outlet passages at each end of the housing. When one of the pumping mechanisms is operated as a motor, it drives the other pumping mechanism as a pump.
A reversible power transmission unit comprising
Dependencies are inferred from the claim text.
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Term ended 23 Mar 2007 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to power transmission units.
In aircraft and the like, it is common to have hydraulic circuits which are totally separated so that if one fails, the others will still function, thereby preventing total loss of control. It is also common to provide power transmission units which function to supply additional flow upon demand from one circuit to the other to maintain integrity of either circuit in the event that there is a malfunction therein, or an exceptionally high flow demand for a limited and known period of time.
Among the objectives of the present invention are to provide a power transmission unit wherein the transmission occurs readily and easily; which power transmission can be reversed; wherein there is substantially little net reaction torque; which have a lower weight; and wherein axial forces tend to cancel one another thereby facilitating construction.
FIG. 1 is a fragmentary longitudinal sectional view of a power transmission unit embodying the invention.
FIG. 2 is a fragmentary end view of one end of the power transmission unit.
FIG. 3 is a sectional view taken along the line 3--3 in FIG. 2.
Referring to FIGS. 1-3, the power transmission unit embodying the invention comprises a housing 10 including a cylindrical side wall 11 and end members 12, 13 sealing the ends of the member 11. Pressure translating devices A, B in the form of barrel-type pumping mechanisms are associated with a common cam block C rotatably mounted within the housing 10.
End member 12 includes passages 14, 15 that may function as inlets or outlets. Similarly, end member 13 includes passages 16, 17 that may function as inlets or outlets. The cam block C includes two interconnected parts 18, 19 with one or more pins 20 holding the parts against relative rotation. The cam block C is rotatably mounted within the housing by axially spaced bearings 21, 22.
A shaft 23 is rotatably mounted within the cam block by bearings 24, 25 and the ends of the shaft 23 project beyond the cam block C for rotatably supporting the pumping mechanism A and B, respectively.