Flat gears change in small space

Article Abstract:

The main advantages of the automatic transmission for bicycles developed by Jean Paul LeNoble are its compactness coupled with a large number of gear ratios. The unit is based on a series of epicyclic gear trains. Each array embodies a particular gear ratio, with the following gear being engaged by centrifugal force. Major bicycle manufacturers are evaluating the design and LeNoble is working on a version with an electronic tachometer which should extend the number of gear ratios and also result in an even smaller, lighter gearbox.

Cover Story, Bicycles

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Metal circuit boards take the drive heat: a new inverter features designed-in copper circuit boards to remove detrimental electro-magnetic and thermal problems

Article Abstract:

A new type of metal based printed wiring board (PWB) has been developed using copper foil tracks on metal sheet backing. It is incorporated into new micro inverters and provides low product cost and offers high performance. The new drives can be used for power components or for power and sign areas, when they are separately zoned.

Innovations, Printed circuits, Printed circuit boards

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Polymer gears need to take the heat

Article Abstract:

It is now becoming clear that plastic gears have very different properties from metal gears. They can experience heat generation and therefore softening at quite low temperatures, and also show much greater thermal expansion coefficients. Plastic gears operate much more quietly than metal ones, and often need no lubrication.

Gearing, Plastic, Plastic gears

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