Standard range of elliptical gears on the market

A Precision Motion (Cofil) product story

Edited by the Engineeringtalk editorial team Oct 19, 2000

Elliptical gears are often proposed for solving problems where one needs a cyclical speed or phase variation between two (or more) connected shafts, and there is now a standard range on the market

There is now a standard range of elliptical gears on the market.

Elliptical gears have been proposed for solving problems where one needs a cyclical speed or phase variation between two (or more) connected shafts.

This is sometimes the case for machines for packaging, textiles, automatic assembly, automatic positioning, quick returns, etc.

The problems are that they are difficult to manufacture and made only to order.

These problems are now solved! Typical performance - the overall ratio is 1:1 so that one revolution of the drive shaft produces one revolution of the driven shaft.

The transmission ratio is the maximum radius divided by the minimum radius.

If there were, say 2:1, then the resulting speed variation would be 4:1 during one cycle.

For example, if the drive shaft rotates at a constant one revolution/second, then the driven shaft speed will vary between a minimum rate of 1/2 revolution/second to a maximum rate of 2 revolutions/second.

But in one second Both drive and driven will have accomplished one revolution.

This range of gears by Nanni Ingrannagi is now offered in Great Britain by Precision Motion (Cofil) Ltd.