Power plants – Pressure fluid source and motor – Input pump and rotary output motor system having...
Patent
1987-12-18
1989-01-03
Look, Edward K.
Power plants
Pressure fluid source and motor
Input pump and rotary output motor system having...
60487, 91485, F16D 3900
Patent
active
047947560
ABSTRACT:
A hydraulic differential having a pair of axial piston displacement units, with one being a fixed displacement unit, and the other being a variable displacement unit, and having flow-directing valve and port plates positioned therebetween. The hydraulic sealing of the components which rotate relative to each other is achieved by a floating mounting of a port plate which is urged by a block spring of the fixed displacement unit against an adjustable valve plate abutting a cylinder block of the variable displacement unit. The drive input for the hydraulic differential includes a rotatable mounting for the fixed angle wobbler of the fixed displacement unit which is drivingly connected through a connecting tubular member to the cylinder block of the variable displacement unit and with the cylinder block of the fixed displacement unit connected to a drive output shaft. Relatively small radial bearings rotatably mount the components within a case and are only required to react the spring load of the block spring acting against the floating port plate.
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patent: 2687049 (1954-08-01), Ebert
patent: 3092036 (1963-06-01), Creighton
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patent: 3799033 (1974-03-01), Pruvot
patent: 4046029 (1977-09-01), Sugden
patent: 4252035 (1981-02-01), Cordner et al.
patent: 4581896 (1986-04-01), Andresen et al.
patent: 4616478 (1986-10-01), Jensen
Look Edward K.
Sundstrand Corporation
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