Take the 2-minute tour ×
LEGO® Answers is a question and answer site for LEGO® and building block enthusiasts. It's 100% free, no registration required.

I have numerous gears, axis and other elements from different Lego Technic sets. I wonder if using them I can make a kind of a differential like this?

this

If not, how can I implement similar functionality in case I have two motorized wheels on one axis that can be steered and connected to motor(s) via cardans like this:

enter image description here

share|improve this question

2 Answers 2

This can definitely be accomplished, although it will be difficult to create a differential as small as the dedicated piece that you mentioned.

Some builders create their own differentials for use in larger models because of the inherent torque limits and slippage that the traditional differential and single bevel gears introduce. Here's one example (source) of a differential that can be created using fairly common elements:

heavy duty differential

The key is to build the frame containing the three gears and then attach a fixed gear to the frame. The tricky part is finding a gear that can pass an axle through the center without being fixed on it. In the example above, half of a turntable was used, but there are a few other parts that could work as well. Here's the turntable (48452):

turntable 48452

If you are comfortable with modifying your parts, you could also drill out the center of a gear to allow it to turn freely.

share|improve this answer

The delicate problem in a brick-built differential is to create the frame. It must have a gear to drive the differential and this gear must let the axle rotate freely. Without parts modification, the only possibility is to use a turntable, either the big one or the small one. Anyway, the solution is bulky and not economical (the differential parts are cheap!). The big version can be interesting nonetheless in large vehicules that require a lot of torque, see here.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.