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ABC new inventors

D Drive
An infinitely variable geared transmission which allows an engine to operate at it’s most efficient setting while allowing the vehicle speed to be continuously varied to suit driving conditions.
About the Inventor
Stephen Durnin is a plumbing inspector working for Redland City Council in Queensland. Although he has no formal engineering background Stephen was raised on a farm wher…

The holy grail of infinitely variable transmissions

The D-Drive: it could be a gearbox revolution, if only people could understand the thing!

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Ready for a bit of a mental mechanical challenge? Try your hand at understanding how the D-Drive works. Steve Durnin’s ingenious new gearbox design is infinitely variable – that is, with your motor running at a constant speed, the D-Drive transmission can smoothly…

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