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Orbital Transmission Speed Reducer

IP.com Disclosure Number: IPCOM000088398D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Skinner, DW: AUTHOR

Abstract

Large ratios of speed reductions can be made in a compact unit by using a set of planetary gears to rotate an orbiting plate which, in turn, drives an output ring.

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Orbital Transmission Speed Reducer

Large ratios of speed reductions can be made in a compact unit by using a set of planetary gears to rotate an orbiting plate which, in turn, drives an output ring.

Referring to the figure, rotatable input shaft 1 drives three planetary gears 2, each having similarly oriented eccentric pins 3. The pins each engage a drive opening in orbiting plate 4 which has a plurality of retained rotatable drive balls 5 at fixed positions about its periphery. These balls engage similar rotatable balls 6 held in fixed positions in output ring 7. The output ring is larger in diameter than the orbiting plate but can carry more or fewer balls than the plate. The output speed S is determined by the relationship

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S = N1 over N0 Times (N2 over K). where NO is the number of teeth on input gear 1, N1 is the number of teeth on eccentric gear 2, N2 is the number of teeth or balls on the periphery of plate 4, and K is the difference in number of teeth or balls between plate 4 and output ring 7.

Two or more eccentric pins 3 can be used to orbit the plate. It is not necessary to use balls in either the plate or output ring, since gears can be used in which the tooth shape is crowned or spiked. However, scrubbing and wear result when using a rigid tooth shape for meshing when applied to heavy loads. The balls may be replaced with roller pins, crowned roller pins or other rotatable members.

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