F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/114
F16H 39/00 (2006.01) F16H 47/04 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1240176
DIFFERENTIAL TRANSMISSION MECHANISM FOR A CONSTANT SPEED DRIVE Abstract A differential transmission mechanism using an output differential for a constant speed drive has de- sirable characteristics including full utilization of the torque capabilities of the hydraulic trim device asso- ciated with the output differential; however, there is a limitation on the utilizaton of the speed capability of the hydraulic components of the trim device at the low end of the input speed range. The disclosed differential transmission mechan- ism utilizing an output differential has a hydraulic trim device with a first hydraulic displacement unit having a normally fixed, approximately maximum displacement con- nected to an element of the output differential and a second hydraulic displacement unit which is of variable displacement connected to a variable speed input shaft. Additional components of the output differential are connected to the input shaft and to an output shaft con- nectable to a load. A sensing device senses the speed of the output shaft to control the displacement of the variable displacement hydraulic displacement unit to control the displacement thereof to achieve a constant output speed by varying the speed of the normally fixed displacement unit as required. Additionally, a sensor senses the speed of the input shaft and, when the speed of the input shaft is below a predetermined value, con- trols the displacement of the normally fixed displace- ment unit to reduce the displacement thereof to ef- fectively make the latter displacement unit a smaller unit which will therefore operate at a faster speed to extend the range of the constant speed drive at the low end of the input speed range.
495155
Baits Stephen S.
Reynolds Richard W.
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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