F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/118, 74/209
F16H 1/28 (2006.01) F16H 1/32 (2006.01) F16H 3/70 (2006.01) F16H 25/06 (2006.01)
Patent
CA 1042685
"MECHANICAL DRIVES" ABSTRACT A compact high-torque mechanical speed changer, which of- fers a very wide range of output speeds in different angular directions through selections from sets of fully-interchange- able planet and sun gear combinations, and in which one pre- determined 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 involv- ing 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 sets, as desired, to yield various speeds and directions of output.
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