| US 7,472,547 B2 | ||
| Hydraulic differential for integrated drive generator | ||
| Andrew P Grosskopf, Rockford, Ill. (US); Magdy A Kandil, Rockford, Ill. (US); Glenn C. Lemmers, Loves Park, Ill. (US); and David S. Behling, Belvidere, Ill. (US) | ||
| Assigned to Hamilton Sundstrand Corporation, Windsor Locks, Conn. (US) | ||
| Filed on Oct. 26, 2006, as Appl. No. 11/588,014. | ||
| Prior Publication US 2008/0098732 A1, May 01, 2008 | ||
| Int. Cl. F16H 39/10 (2006.01); F16H 61/48 (2006.01) | ||
| U.S. Cl. 60—489 [60/487] | 19 Claims |
| 1. A hydraulic differential with a variable displacement hydraulic unit of the axial piston type, a fixed displacement hydraulic
unit of the axial piston type, a stationary housing for mounting the hydraulic units, an input shaft for coupling to a variable
speed power source and an output shaft for coupling to a constant speed load, wherein the input and output shafts extend out
of a single end of the stationary housing, comprising:
a wobbler and a port plate for the variable displacement hydraulic unit coupled to the stationary housing;
an axial block and piston set for the variable displacement hydraulic unit, a port plate for the fixed displacement hydraulic
unit and a wobbler for the fixed displacement hydraulic unit coupled to the input shaft; and
an axial block and piston set for the fixed displacement hydraulic unit coupled to the output shaft;
wherein the variable displacement hydraulic unit port plate and the fixed displacement hydraulic unit port plate couple together
through a circumferential interface to minimise hydraulic thrust forces developed by the hydraulic units.
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