Jurgens Technic Corner

Home of Jurgen’s Lego® creations

Extremely reliable transmission with differential

I like motorized LEGO very much, but one thing I don't like is grinding gears, which occur when a drivetrain isn't constructed solid enough. The torque of the motor causes the gears to come apart, creating an awful clicking noise and reducing driving power. This mostly happens in a transversive gearing, since they have only a small surface to transfer the power. LEGO® has make an excellent part for this: the knob-wheel

This part is compattible with no other LEGO® gear, only with itself, but provides a very nice transversive gearing.

I've created a drivetrain with this part, which includes a differential. It will be used in my next MOC, which is supposed to go quite fast. The design has 3 internal gearing options (as you can see in the video). If your model isn't too big, you could also use the combination of the 8-tooth and the 24-tooth:
 

But the 8-tooth gear isn't very strong. I've already damaged some when testing models which had flaws. These parts are normally omitted in drivetrains with much torque in my models.

Here's how you can make one:
 

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