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4-speed RC Sequential Gearbox
4-spead Sequential Gearbox with PF-control with building-instructions
About this creation
Hi folks !!

For some time I wanted to make my own remote-controlled reliable gearbox with more than 2 speeds. I've seen some nice designs, like Sariel's aeroshift and Sheepo's 7+R gearbox, for which I've had the honour to make building-instructions.

See mine in action:

There were a number of important aspect:
* Reliable drivetrain
* Preferably 4-speeds
* Being able to switch gears with a single motor
* No pneumatics

Like in Sariel's design, the transmissions consists of identical modules, where each module has 1 driving-ring and adds 1 gear. All the gear-ratios are identical: 5/3 from 1st to second, 5/3 from 2nd to 3rd and 5/3 from 3rd to 4th. The total amount of gear-reduction is about 4,63. By using the 24-8-tooth gear combinations (instead of 12-20), ratio's of 3/1 can be achieved.

For effeciency-reasons, the gearbox only reduces speed, the highest gear is actually neutral (same speed coming out as is coming in). Also for the efficiency, the module(s) with gear-reduction are located nearest to the input. This way the dead gears have less effect.

The switching systems was inspired by Sheepo's gearbox, but I wanted to use the ridged axle-joiners insted of the smooth ones Sheepo used. This way the driving-rings would stay in place better, contributing to a more reliable drivetrain.

This gearbox will be used in my new supercar, with which some succesful driving tests have been done.

I plan to expand the desing with some kind of stepped motor to improve the swithing-system, but for now it works quite nicely.

I've made complete step-by-step building instructions so you can include this gearbox in your own designs. You can download them in my brickshelf-folder.

All comments & suggestions are welcome.

Building instructions
Download building instructions (LDRAW format)


  January 9, 2017
Is this just the RC version of your mechanically-controlled 4-speed sequential gearbox? because i built your non-RC 4 speed gearbox, and i would like to make it RC.
 I made it 
  April 23, 2010
Yes, it's quite big & bulky, but works quite well. Tests with a big car, 2 XL-motors and this gearbox produce quite good results.
 I like it 
  April 23, 2010
It's fantastic !!! But you really need a big car to put it in ;-)
 I like it 
  April 21, 2010
wow. looks really good. its big, but good.
By Jurgen Krooshoop
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Added April 18, 2010

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LEGO models my own creation MOCpages toys shop 4-speed RC Sequential GearboxTechnic

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