Input-split hydromechanical transmission

Details Input-split hydromechanical transmission Input-split hydromechanical transmission

1975-03-27

1976-09-28

Vrablik, John J.

Machine element or mechanism

Elements

Gear casings

F16H 4704

Patent

active

039824489

ABSTRACT:
A hydromechanical transmission in which the first and second drive ranges are input-split drives. In one embodiment the transmission includes a hydrostatic portion comprised of two hydraulically interconnected, variable displacement, hydraulic pump-motor units and two planetary gear sets which are controlled by a brake and a clutch to provide the two ranges. In another embodiment a third planetary gear set and a second clutch are added to provide increased torque coverage in first range and also provide a third drive range. In both embodiments the speed ratio within the drive ranges is varied by controlling the displacement ratio between the pump-motor units. The shifting from one drive range to another occurs at synchronous speeds, thereby reducing the shift energy absorption required in the clutches and brakes.

REFERENCES:
patent: 3212358 (1965-10-01), De Lalio
patent: 3470769 (1969-10-01), Livezey
patent: 3592077 (1971-07-01), Polak
patent: 3866490 (1975-02-01), Orshansky, Jr.
patent: 3869939 (1975-03-01), Miyao et al.

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