# Noncircular Planetary Drive

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This Demonstration simulates a noncircular planetary roller drive by two curves (ring and planet), with the inside planet rolling without slipping.

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Contributed by: Erik Mahieu (January 2014)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

The cumulative angular displacement function that generates the ring curve is given by . The radii at the mutual contact point are and . These are effectively the polar equations of the two curves.

For a good article about noncircular gears, see [1].

Reference

[1] J. Doric, I. Klinar, and M. Dori, "One Approach for Modelling Intermittent Motion Mechanism with Noncircular Gears," *Machine Design*, 3(2), 2011 pp. 121–126. www.mdesign.ftn.uns.ac.rs/pdf/2011/no2/121-126.pdf.

## Permanent Citation