sun gear

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Related to sun gear: planetary gear

sun′ gear`

(in an epicyclic train) the central gear around which the planet gears revolve.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.sun gear - the central gear in an epicyclic train
epicyclic gear train, epicyclic train - a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
cogwheel, gear, gear wheel, geared wheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
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References in periodicals archive ?
Model of the simplified single pinion PGS for example consists of two 0-junction and one 1 junction and one transformer with module reflecting the ratio between the ring and sun gear teeth counts ([beta]=[z.sub.r]/[z.sub.s]).
The sun gear of the planetary gear is connected to a small motor while the ring gear connected to a larger driving motor.
Make sure your summer adventure pack is full of sun gear: sunscreen, sunglasses, SPF clothing, and a baseball cap or a wide-brimmed hat.
Control in such devices is realised by means of a sun gear, which rotates the hydraulic pump of a closed hydraulic system through a gear train and pumps the liquid in it with a certain angular velocity of the control link.
The small sun gear of the front PGT is connected to MG1, which can be held stationary by the wet brake clutch B2.
'We wish to remind everyone to bring sun gear, like umbrellas, sunglasses and hats due to the hot weather.
As is common in the horizontal wind turbines, the ring gear would be connected to the bedplate, and the planet carrier would be connected to the rotor hub, while the sun gear would be connected to the output shaft, which is connected to the next stage.
The reducer, comprising two-stage planetary gear sets with sun gear input and carrier output, provides the output power to cutting head.
MG2 is linked to the sun gear directly, while MG1 is connected to the ring gear and separated from engine by an electronic control clutch.
We observed that the meshing frequency under three- axis driving occurred at two kinds of frequency harmonics, caused by the meshing relationship between ring and planet gear and between planet and sun gear. Comparing these results, we constructed a method of calculating their frequencies on the basis of instantaneous rotation center theory.
This is much simpler than using a mechanical planetary system where the speed of the sun gear must be controlled.
Former basic units 1c (planetary carrier) and 1s (sun gear) are connected to units 2r (inner ring) and 2c (planetary carrier) of differential gear train, respectively.