Power plants – Pressure fluid source and motor – Input pump and rotary output motor system having...
Patent
1991-12-23
1993-04-27
Look, Edward K.
Power plants
Pressure fluid source and motor
Input pump and rotary output motor system having...
60488, 60489, 91476, 91477, 91184, 91189A, 91505, 91506, 92 122, 418 60, F16D 3900
Patent
active
052051234
ABSTRACT:
An infinitely variable differential hydrostatic transmission utilizing a fixed displacement pump/motor and a variable displacement pump/motor interconnected with appropriate valving, to provide a mechanical/hydraulic differential drive which is capable of achieving an overall efficiency in the 98.degree.-99.degree. range. In the preferred embodiment, which utilizes axial piston type pump motors, pistons in multiples of four are utilized in order that each piston will have a piston located 90.degree. from it to serve as its control valve. The fixed and variable displacement motor/pump are provided as an integral unit containing bearing mountings, cylinder barrels, valve ports, piston seal mountings, hydraulic flow passages, pressure reservoirs and manifolding by forming a series of individual segments and sealing them together into a single structural unit. A unique mounting arrangement is utilized to positively attach the pistons to an anti-friction swashplate which eliminates all side loads on the piston. Finally, a novel piston valve seal reduces hydraulic leakage and sliding friction, and a novel pumping device is utilized for pressurizing the pump motor units and replacing fluid lost through leakage.
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Look Edward K.
Mattingly Todd
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