Compact steering apparatus

Details Compact steering apparatus Compact steering apparatus

1995-04-13

1996-08-13

Wright, Dirk

Planetary gear transmission systems or components

Steering by driving

With infinitely variable drive

F16H 4704

Patent

active

055450989

ABSTRACT:
A hydro-mechanical steering differential is provided for delivering motive power to right and left output drive members both during straight traveling and during steering. The subject invention includes first and second planetary gear arrangements with a rotatable motor floatingly disposed therebetween. An input member is drivingly connected to both a ring gear of the first planetary gear arrangement and a planet carrier of the second planetary gear arrangement. A sun gear of the first planetary gear arrangement is connected to both the left output drive member and a drive unit of the rotatable motor. A driven unit of the rotatable motor and a sun gear of the second planetary are both connected to the right output drive member. The subject arrangement provides, in a compact design, motive power to the right and left output drive members both while traveling straight and during steering without requiring a separate differential lock.

REFERENCES:
patent: 4434680 (1984-03-01), Riediger et al.
patent: 5004060 (1991-04-01), Barbagli et al.
patent: 5396768 (1995-03-01), Zulu
SAE Paper No. 941722, "Development of Hydromechanical Transmission (HMT) for Bulldozers", H. Mitusya et al., Milwaukee, Sep. 12-14, 1994.

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