MOC: 4-speed Remote Controlled Gearbox

[Jurgen Krooshoop]

As noticed earlier by dluders, I've created a new gearbox. (maybe an admin wants to join these 2 topics to keep the forum tidy).

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:

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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.

Edited April 19, 2010 by Jurgen Krooshoop

[DLuders]

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

The 4-speed RC gearbox looks great! Do you have to modify your existing "Wasp" Black Technic Supercar ( http://www.brickshelf.com/cgi-bin/gallery.cgi?f=412228 ) to make a 4-speed transmission? It sure is packed with gears already:

[Jurgen Krooshoop]

The 4-speed RC gearbox looks great! Do you have to modify your existing "Wasp" Black Technic Supercar ( http://www.brickshelf.com/cgi-bin/gallery.cgi?f=412228 ) to make a 4-speed transmission? It sure is packed with gears already:

No, I won't be modifying my "Wasp"-supercar (it's been disassembled more than a year ago....).

I am making a completely new car with will feature this gearbox.