Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1993-06-22
1995-06-06
Look, Edward K.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 80, F16H 4704
Patent
active
054217903
ABSTRACT:
A continuously variable transmission includes an input shaft, an output shaft, and first and second epicyclic gear trains, each with an input member, an output member and a reaction member. An hydrostatic shunt loop including first and second hydraulically interconnected variable displacement hydraulic units interconnects the two epicyclic gear trains. The input members of both epicyclic gear trains are driven from the input shaft, and the output members of both epicyclic gear trains drive the output shaft. First and second drive trains are provided for alternatively coupling the first variable displacement hydraulic unit respectively to either the input shaft or the reaction member of the first epicyclic gear train. Third and fourth drive trains are provided for alternatively coupling the second variable displacement hydraulic unit respectively to either the output shaft or the reaction member of the second epicyclic gear train. A transmission control system is provided for selective operation of the first, second, third, and fourth gear trains to operate the transmission in three modes. In the first mode, the second and third gear trains are operational to utilize the first epicyclic only with its reaction member connected to the output shaft via the hydrostatic shunt loop. In the second mode, the second and fourth gear trains are operational to utilize both epicyclics with their reaction members interconnected via the hydrostatic shunt loop. Finally, in the third mode, the first and fourth gear trains are operational to utilize the second epicyclic only with its reaction member connected to the input shaft via the hydrostatic shunt loop.
REFERENCES:
patent: 3580107 (1971-05-01), Orshansky, Jr.
patent: 3888139 (1975-06-01), Orshansky, Jr.
patent: 4563914 (1986-01-01), Miller
patent: 5011463 (1991-04-01), Jarchow et al.
Look Edward K.
Massey-Ferguson S.A.
Verdier Christopher
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