Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Pump and motor in series with planetary gearing
Patent
1994-06-16
1996-03-26
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Pump and motor in series with planetary gearing
60487, F16H 4704
Patent
active
055016405
ABSTRACT:
An improved hydrostatic transmission which is compact, reliable and economical to manufacture, including a novel means for reducing the speed of the input to the transaxle using both hydraulics and mechanical gearing; an improved differential which is stronger and less complicated than prior art designs; a more effective and efficient means for braking the transaxle, an improved means for hydraulically bypassing the hydrostatic transmission and a unique check valve arrangement for maintaining oil pressure within the hydrostatic transmission.
REFERENCES:
patent: 4893524 (1990-01-01), Ohashi et al.
patent: 4903545 (1990-02-01), Louis et al.
patent: 4942780 (1990-07-01), Fujisaki et al.
patent: 4953426 (1990-09-01), Johnson
patent: 5156576 (1992-10-01), Johnson
patent: 5289738 (1994-03-01), Szulczewski
patent: 5317936 (1994-06-01), Shiba et al.
Hauser Ray M.
Johnson Alan W.
Browne Robert E.
Hydro-Gear Limited Partnership
McDonough Thomas C.
Wright Dirk
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