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...
Reexamination Certificate
2007-02-20
2007-02-20
Wright, Dirk (Department: 3681)
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...
Reexamination Certificate
active
10984865
ABSTRACT:
A transmission apparatus for a working vehicle comprises a hydrostatic transmission, a sun-and-planetary gearing unit, and an auxiliary speed changing system. The hydrostatic transmission includes a hydraulic pump driven by a prime mover equipped on the working vehicle, a hydraulic motor fluidly connected to the hydraulic pump, and a hollow motor shaft serving as an output shaft of the hydraulic motor. The sun-and-planetary gearing unit includes first, second and third elements arranged coaxial to the motor shaft. The first element is drivingly connected to the motor shaft so as to be rotated integrally with the motor shaft. The second element is drivingly connected to front wheels of the working vehicle. The third element is drivingly connected to rear wheels of the working vehicle and differentially connected to the second element through the first element. The auxiliary speed changing system is drivingly interposed between the hollow motor shaft and the first element.
REFERENCES:
patent: 3122025 (1964-02-01), Mark et al.
patent: 3597998 (1971-08-01), Ebert
patent: 1-72416 (1989-05-01), None
patent: 4-297334 (1992-10-01), None
Irikura Koji
Ishii Norihiro
Sterne Kessler Goldstein & Fox P.L.L.C.
Wright Dirk
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