Saturday, December 19, 2009

TBs TechTips 29 - A sequential gearbox by Sariel

A few weeks ago, Sariel presented us with a new gearbox design.
This time a 3-speed sequential synchronized gearbox, that shifts pneumatically and thus can be fully remotely operated with ease.
Put in the author's words 'AeroShift Gearbox', once '3-speed remote-controlled sequential synchronized pneumatic gearbox' didn't sound that catchy...

This gearboxes can operate with ratios: 1:1, 3:1 and 9:1. But can be easily modified to 1:1, 1,66:1 and 2,77:1 ratios, if they better fit your model needs.
The dimensions are 12 studs long, 8 studs wide and 4 studs tall (plus some extra space on the top, for the pneumatics).

This was made modular, so that extra speeds could be achieved by adding extra modules (one per extra speed) at the cost of extra space (which will increase fast and dramatically) and a more complex pneumatic control system.
This is however a very good exercise and proof of concept from Paul, for a very challenging problem (the sequential command for N-speed gearboxes).

You may find a lot more information from the realization perspective and images, from the original post at

However stay tunned, there is more about sequential gearboxes out there!


RjbsNXT said...

I really like this design: the input/output axles are in line, only one motor for changing gears (and no 'over changing' where 2 gears are accidentally jumped instead of one), and remote controlled... well that tops it all ;)

The only downsides are its size, and the driving rings might be a problem (although they are starting to become more common on more recent models).

jorho erst said...

pretty sweet!

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