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shaft. Since these shafts are always aligned by the input gears this allows the output to be transmitted through roller bearings rather than intermittent surface contact. Due to the planetary input this is effectively a two-stage drive and may be designed to be directly driven by a high speed brushless motor. This type is often used in
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discs the static imbalance is corrected but a small dynamic imbalance remains. This is generally considered acceptable for most applications. To reduce vibration, high-speed drives use three or more discs to correct the imbalance; the outer discs move in unison, in opposition to the middle one, which is twice as massive.
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Due to the eccentric nature of the drive, if the cycloidal disk is not balanced by a second disk or a counterweight, it will generate vibrations which propagate through the driven shafts and the body. This increases wear on the exterior teeth of the cycloidal disk and the component bearings. With two
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Many modern precision drives provide the eccentric motion through multiple shafts that also transmit the output force, typically 2 to 5 shafts arranged in the same circular pattern as the output rollers of the most basic design. The shafts are driven through planetary-like gears by a central input
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Cycloidal drives can feature zero backlash and high torque capacity while being compact in size, unlike
Involute gearboxes. They are useful in situations where low speed with high torque is required. Cycloidal drives may be designed with significantly higher contact areas for their size than any
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The cycloidal disc has holes that are larger (by an amount equal to the eccentricity of the input shaft) than the output roller pins that go inside them. The output pins will move around in the holes to achieve steady rotation of the output shaft from the wobbling movement of the cycloidal disc.
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bearing that in turn drives the cycloidal disc in an eccentric, cycloidal motion. The perimeter of this disc is geared to a stationary ring gear and has a series of output shaft pins or rollers placed through the face of the disc. These output shaft pins directly drive the output shaft as the
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The number of pins on the ring gear is larger than the number of pins on the cycloidal disc. This causes the cycloidal disc to rotate around the bearing faster than the input shaft is moving it around, giving an overall rotation in the direction opposing the rotation of the input shaft.
188:(typically a cylindrical roller bearing), causing the cycloidal disc to wobble in a circle. The cycloidal disc will independently rotate around the bearing as it is pushed against the ring gear. This is similar to
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in order to minimize the eccentricity of the disc and the associated unbalance forces at high speeds. For this reason, two cycloid discs are often mounted offset by 180°.
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Single-stage efficiency approaches 93% and double-stage approaches 86%. Single stage reductions are available commercially up to 119:1 and double stage up to 7,569:1.
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299:. They apply force through many of the teeth at once, allowing very high torque output relative to size at the cost of requiring sliding contact.
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366:"Design principle and numerical analysis for cycloidal drive considering clearance, deformation, and friction"
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156:. Cycloidal speed reducers are capable of relatively high ratios in compact sizes with very low
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cycloidal disc rotates. The radial motion of the disc is not translated to the output shaft.
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192:. The direction of rotation of the disc and output is opposite to that of the input shaft.
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Qi, Le; Yang, Dapeng; Cao, Baoshi; Li, Zhiqi; Liu, Hong (March 2024).
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of the cycloidal drive is obtained from the following formula, where
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Clock
Mechanism – cycloidal drive with 15:1 reduction in motion
340:"Shimpo Drive Systems - Circulute 3000 Cycloidal Speed Reducer"
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speed reducer is a mechanism for reducing the speed of an
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Cogulator – demonstration cycloidal drive in motion
60:. Unsourced material may be challenged and removed.
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180:Parts of a 10:1 cycloidal speed reducer mechanism
215:is the number of lobes on the cycloidal disc.
184:The input shaft is mounted eccentrically to a
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8:
265:The cycloid disc is usually designed with a
211:means the number of the ring gear pins and
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316:– A gear tooth shape based on the cycloid
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120:Learn how and when to remove this message
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19:For the marine propulsion system, see
7:
58:adding citations to reliable sources
686:Continuously variable transmission
449:"How does a cycloidal drive work?"
252:{\displaystyle r={\frac {P-L}{L}}}
23:. For the gear tooth profile, see
16:Eccentric gear reduction mechanism
14:
295:gear-based transmission such as
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45:needs additional citations for
370:Alexandria Engineering Journal
136:Animation of a cycloidal drive
1:
563:Epicyclic (planetary) gearing
342:. 2008-12-19. Archived from
406:"DARALI CYCLOIDAL REDUCERS"
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447:tec-science (2019-01-14).
163:The input shaft drives an
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807:Spur gear corrected tooth
383:10.1016/j.aej.2024.01.077
476:Darali Cycloid Reducers
429:. www.sumitomodrive.com
186:rolling-element bearing
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729:Shaft-driven bicycle
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54:improve this article
568:Sun and planet gear
172:Theory of operation
797:Gear manufacturing
633:Geartooth profiles
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583:Non-circular gear
548:Spur gear systems
309:Epicyclic gearing
297:epicyclic gearing
267:shortened cycloid
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190:planetary gearing
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69:"Cycloidal drive"
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346:on 2008-12-19
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281:Disadvantages
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71: –
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65:Find sources:
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43:This article
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666:Differential
661:Transmission
614:Spiral bevel
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456:. Retrieved
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431:. Retrieved
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410:. Retrieved
408:. Darali.com
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348:. Retrieved
344:the original
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314:Cycloid gear
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52:Please help
47:verification
44:
25:cycloid gear
792:Chain drive
752:Wheel train
624:Herringbone
453:tec-science
376:: 403–418.
150:input shaft
787:Belt drive
772:Ball screw
719:Derailleur
553:Worm drive
458:2019-11-05
433:2013-08-31
412:2013-12-04
350:2024-04-08
326:References
290:Advantages
80:newspapers
802:Freewheel
782:Jackscrew
777:Leadscrew
654:Mechanics
392:1110-0168
238:−
165:eccentric
146:cycloidal
822:Category
765:See also
744:Horology
734:Sprocket
724:Hub gear
707:Bicycles
700:Examples
671:Coupling
640:Involute
303:See also
158:backlash
110:May 2021
645:Cycloid
619:Helical
541:Systems
498:YouTube
487:YouTube
94:scholar
714:Cogset
691:Offset
592:Shapes
390:
96:
89:
82:
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67:
828:Gears
676:Train
609:Crown
604:Bevel
534:Gears
154:ratio
101:JSTOR
87:books
599:Spur
388:ISSN
203:The
73:news
496:on
485:on
378:doi
144:or
56:by
824::
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374:91
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140:A
526:e
519:t
512:v
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245:L
241:L
235:P
229:=
226:r
213:L
209:P
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108:(
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