Hydrostatic mechanical transmission and controls therefor

Details Hydrostatic mechanical transmission and controls therefor Hydrostatic mechanical transmission and controls therefor

1975-07-09

1977-05-24

Geoghegan, Edgar W.

Machine element or mechanism

Elements

Gear casings

F16H 4704

Patent

active

040247759

ABSTRACT:
A hydrostatic mechanical transmission is disclosed having an infinitely variable split torque, planetary drive unit driving a set of range gears, in part mechanically and the remainder through a hydrostatic path comprising variable displacement hydrostatic devices acting alternately as a pump or motor and controlled through a system of hydraulic valves utilizing the same fluid as the hydrostatic devices. Five forward and two reverse ranges are provided in a relatively small package. Control is effected through a manually operated shift lever providing control signals to both the variable displacement hydrostatic devices and range selector unit, with appropriate control and safety features being provided to assure positive and smooth range changes, to prevent reverse rotation in the hydraulic unit, to sense a zero speed condition in the hydraulic units, and to insure positively synchronizing and matching speed conditions for gear engagement.

REFERENCES:
patent: 2808737 (1957-10-01), Bullard
patent: 2939342 (1960-06-01), Woydt et al.
patent: 2972905 (1961-02-01), Bullard
patent: 3106855 (1963-10-01), Reichenbaecher
patent: 3204486 (1965-09-01), De Lalio
patent: 3298174 (1967-01-01), Stoyke et al.
patent: 3496803 (1970-02-01), Whelahan
patent: 3580107 (1971-05-01), Orshansky, Jr.
patent: 3611838 (1971-10-01), Utter
patent: 3733931 (1973-05-01), Nyman
patent: 3842694 (1974-10-01), Marlow
patent: 3864991 (1975-02-01), Nembach

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