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
1998-04-13
1999-11-02
Ta, Khoi Q.
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, 475 81, F16H 4704
Patent
active
059760460
ABSTRACT:
A multi-range, synchronous shifting, hydromechanical transmission according to the present invention is suitable for application in an automotive drivetrain including a high speed engine. The transmission receives split power inputs from the engine; one input being geared down to a suitable lower speed for driving a continuously variable hydrostatic transmission unit, while the other input drives a counter shaft from which mechanical outputs are take at different speed ratios. A planetary gear set, driven by the hydrostatic transmission unit output, is shiftable to provide either a narrow continuously variable speed hydrostatic output, range suitable for transmission operation in low output ranges or a wide continuously variable speed hydrostatic output range suitable for transmission operation in high output ranges. A gear system includes a plurality of gears selectively conditioned by plural clutches and brakes to combine the hydrostatic outputs from the planetary gear set and the mechanical outputs from the counter shaft, such as to produce vehicle propulsion transmission outputs in any one of four continuously variable speed forward ranges and one continuously variable speed reverse range.
REFERENCES:
patent: 3596535 (1971-08-01), Polak
patent: 4754664 (1988-07-01), Dick
patent: 5423183 (1995-06-01), Folsom
patent: 5486142 (1996-01-01), Folsom
patent: 5535589 (1996-07-01), Folsom
patent: 5678405 (1997-10-01), Folsom
patent: 5730678 (1998-03-01), Larkin
U.S. Application No. 08/857,501.
General Dynamics Land Systems Inc.
Ta Khoi Q.
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