Planetary reduction drive unit

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

F16H 128

Patent

active

040403122

ABSTRACT:
A reduction drive unit, such as a wheel hub of the type including a fluid motor operable to rotate a shaft, a sun gear engaging the shaft, a planetary gear set engaging the sun gear, and a ring gear driven by the planetary gears to drive a rotating hub. The rotating hub includes a secondary hub portion surrounding the housing of the fluid motor, with a bearing set and an oil seal disposed between the motor housing and second hub portion. The oil seal has a large enough diameter, relative to the bearing set and adjacent portions of the motor housing and hub portion, that the motor housing may be removed from within the hub without damaging the oil seal. The rotating ring gear is attached to the rotating hub by means of a plurality of bolts, alternate ones of which are body fitting bolts which attach the rotating ring gear directly to the hub, while the remainder of the bolts pass through the cover as well as the rotating ring gear and hub, to permit removal of the cover without movement of the rotating ring gear. The drive shaft, which is normally in driving engagement with the sun gear, may be removed, without removing the sun gear, and reinserted in a reversed orientation, thus permitting the planetary gear set to freewheel relative to the fluid motor, for example, to permit towing of the vehicle.

REFERENCES:
patent: 1377864 (1921-05-01), Walter
patent: 2709327 (1955-05-01), Heth
patent: 3184985 (1965-05-01), Drietzler
patent: 3686978 (1972-08-01), Knoblach et al.
patent: 3812928 (1974-05-01), Rockwell et al.

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