Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1974-12-06
1976-12-21
Scott, Samuel
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
F16H 128
Patent
active
039981126
ABSTRACT:
A compact high-torque mechanical speed changer, which offers a very wide range of output speeds in different angular directions through selections from sets of fully-interchangeable planet and sun gear combinations, and in which one predetermined counterweighting unit provides matching for the eccentricities associated with all the planet gears of such sets, comprises two sets of planet and sun gear combinations each having a one-tooth difference in numbers of effective teeth, the two externally-toothed planet gears being coupled together angularly and being mounted for eccentric rotation relative to a supporting input crankshaft, while the associated internally-toothed sun gears are respectively fixed with the changer housing and with an output member rotatable collinearly with the input shaft. Planet-gear teeth or lobes are of epitrochoid curvature, and all of the planet gears of such sets are of the same diameter; concomitantly, the companion sun gears, which are preferably of the type involving discrete roller-pin teeth rather than continuous-curvature teeth, are of the same diameter and only the number of such rollers varies from set to set. In other dimensional respects the gear sets are substantially identical and can therefore be interchanged to effect different ratios and directional senses of input to output speeds. A counterweight offsets the input-shaft and planet-gear eccentricities, and serves any selected planet gears from such sets. The changer housing and interior mountings for gear combinations accommodate assembly of the sets, as desired, to yield various speeds and directions of output.
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Chandler Lance W.
Compudrive Corporation
Mrose James E.
Scott Samuel
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