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Design Innovation

A New Design of a Two-Stage Cycloidal Speed Reducer

[+] Author and Article Information
Mirko Blagojevic, Nenad Marjanovic, Zorica Djordjevic

Blaza Stojanovic

 Faculty of Mechanical Engineering, Kragujevac, Serbiablaza@kg.ac.rs

Aleksandar Disic

 Institute for Vehicles Zastava, Kragujevac, Serbiaaleksandardisic@gmail.com

J. Mech. Des 133(8), 085001 (Aug 08, 2011) (7 pages) doi:10.1115/1.4004540 History: Received September 25, 2010; Revised June 22, 2011; Published August 08, 2011; Online August 08, 2011

A new design of a two-stage cycloidal speed reducer is presented in this paper. A traditional two-stage cycloidal speed reducer is obtained by the simple combination of single-stage cycloidal speed reducers. A single-stage reducer engages two identical cycloid discs in order to balance dynamical loads and to obtain uniform load distribution. Consequently, the traditional two-stage reducer has four cycloid discs, in total. The newly designed two-stage cycloidal speed reducer, presented in this paper, has one cycloid disc for each stage, that is, two cycloid discs in total, which means that it is rather compact. Due to its specific concept, this reducer is characterized by good load distribution and dynamic balance, and this is described in the paper. Stress state analysis of cycloidal speed reducer elements was also realized, using the finite elements method (FEM), for the most critical cases of conjugate gear action (one, two, or three pairs of teeth in contact). The results showed that cycloid discs are rather uniformly loaded, justifying the design solution presented here. Experimental analysis of the stress state for cycloid discs was realized, using the strain gauges method. It is easy to conclude, based on the obtained results, that even for the most critical case (one pair of teeth in contact) stresses on cycloid discs are in the allowed limits, thus providing normal functioning of the reducer for its anticipated lifetime.

FIGURES IN THIS ARTICLE
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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Design , Gears , Disks , Speed , Stress , Stress , Rollers , Force
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Figures

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Figure 1

A single-stage cycloidal speed reducer

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Figure 2

The traditional design of a two-stage cycloidal speed reducer (1—input shaft with the eccentric (the first stage), 2—the first stage cycloid discs, 3—stationary ring gear of the first stage, 4—output disc of the first stage with output rollers and output shaft, 5—input shaft with the eccentric (the second stage), 6—the second stage cycloid discs, 7—stationary ring gear of the second stage, 8—output disc of the second stage with output rollers and output shaft)

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Figure 3

The kinematic scheme of the newly designed two-stage cycloidal speed reducer

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Figure 4

A disassembled two-stage cycloidal speed reducer of the new design

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Figure 5

A photo of the manufactured physical model of the cycloidal speed reducer

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Figure 6

The first stage cycloid disc

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Figure 7

Von-Mises stress distribution on the first stage cycloid disc—three pairs of teeth in contact

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Figure 8

Values of maximum Von-Mises stress on cycloid discs

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Figure 9

Central disc (loads and constraints)

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Figure 10

Stationary ring gear pin (contact stress)

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Figure 11

Model for experimental analysis at the testing table

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