Stepless hydrostatic-mechanical transmission

Details Stepless hydrostatic-mechanical transmission Stepless hydrostatic-mechanical transmission

1990-03-23

1991-10-01

Herrmann, Allan D.

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 74, 475267, 475153, F16H 4704

Patent

active

050529870

ABSTRACT:
A stepless hydrostatic mechanical transmission between a prime mover and a power output train in which an epicyclic differential is incorporated in the transmission and includes at least four shafts, a large and a small sun wheel, two planet wheels in mesh with the sun wheels, a web supporting the planet wheels and an annulus. Two main shafts constituting input and output shafts are connected with respectively different shafts of the epicyclic differential. Two hydrostatic machines are connected to the epicyclic differential such that in at least one working range of the power transmission the hydrostatic machines are adapted to be connected to the epicyclic differential and operated as pumps and motors. The operation of at least one of the hydrostatic machines is changed over by a clutch, when the other hydrostatic machine is stationary and during transition from one working range to another, from connection with the output shaft to the small sun wheel and, during traction operation, from the motor function to the pump function. In the epicyclic differential, the large sun wheel is driven by the input shaft and is located between the small sun wheel and the prime mover.

REFERENCES:
patent: 3468192 (1969-09-01), Nasvytis
patent: 3913325 (1975-10-01), Miyao et al.
patent: 4216684 (1980-08-01), Hagin et al.
patent: 4233858 (1980-11-01), Rowlett
patent: 4313351 (1982-02-01), Hagin
patent: 4423794 (1984-01-01), Beck
patent: 4471668 (1984-09-01), Elsner
patent: 4843907 (1989-07-01), Hagin et al.

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