Hydrostatic mechanical power transmission system particularly hy

Details Hydrostatic mechanical power transmission system particularly hy Hydrostatic mechanical power transmission system particularly hy

1997-07-02

1999-09-07

Marmor, Charles A

Machine element or mechanism

Gearing

With fluid drive

74720, 180307, 60438, F16H 4702

Patent

active

059469838

ABSTRACT:
A power transmission system, particularly a hydrostatic-mechanical power transmission system for industrial and farming vehicles and the like, comprising a first train of constantly meshed gears which are adapted to selectively connect, through a first pair of clutch units, the prime mover (of the vehicle) to a hydrostatic pump and/or to a hydrostatic motor; and a second train of gears which are adapted to selectively connect, through a second pair of clutch units, the hydrostatic motor or the pump to the output shaft, thus providing a hydrostatic continuously variable transmission (CVT) known in the art as I.sup.2. A mechanical transmission with two or more speed ratios is provided downstream of the hydrostatic transmission and, in addition to duplicating the speed interval of the hydrostatic unit several times, it allows to provide, one or more times, two purely mechanical speed ranges by alternately closing one of the first pair of clutch units and the contiguous clutch unit of the second pair and then closing the other two. When the second clutch unit of the first pair is also closed under mechanical power transmission, a hydrostatic braking condition is produced which can be modulated by adjusting the displacements of the hydrostatic pump and of the hydrostatic motor, which are rotated simultaneously.

REFERENCES:
patent: 3213712 (1965-10-01), Swift
patent: 3255589 (1966-06-01), Ebert
patent: 4750381 (1988-06-01), Yasuo et al.
patent: 4895049 (1990-01-01), Kita et al.
patent: 5193496 (1993-03-01), Kanayama
patent: 5329828 (1994-07-01), Hurth
patent: 5803856 (1998-09-01), Lino et al.

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