Simple Drivetrains with Torque Converter

[schofieldius]

I recently published my findings on using a sprung differential as a torque converter.

I believe I have proved that a simple combination of a pb&g motor and a differential can amplify the pb&g's spring action down the drivetrain to compensate for a resistance on the wheel assembly.

I would like to ask for some help with this. My mechanical engineering knowledge is topped out, and I'd really like to continue exploring this. Let me know if you have any ideas, more formal collaboration would be appreciated also. I'm looking at combining this torque converter with existing gearboxes, and also exploring its response at different speeds.

 

http://imgur.com/gallery/IRGFReN

[Zerobricks]

So if I understand correctly, when there's an obstacle the diff starts to wind up the pullback motor. Once the obstacle is overcome the saved energy is fed back, so the model gets a sudden boost of previously saved energy. I wouldn't really call it a gearbox, but more of a power collector?

[Andman]

Try running the test at 0:48 without the pullback motor. :-)

I'm afraid you build something which is not what you think it is. Basically the following happens:

You turn on the motor. Due to the diff the mechanical force can go two paths: To the pullback motor and to the wheels. Because of physics this force will go the path which has  less resistance/friction.

With the car being in front of the heavy box, the resistance of the path to the wheels is greater than the resistance of the pullback motor. UNTIL the spring inside the pull back hits its limit. Thats the point where the resistance of the pullback is greater than the resistance/friction of the box.

There is only one way the modify torque (am I correct? I think so :-): Change of speed. When you lower the speed with gears, you gain torque. When you increase the speed with gears, you loose torque.

Edited April 30, 2020 by Andman
typo, additions

[Andman]

Have a look at the gearbox below. Try it implement it in your second test car and see what happens.

 

More info about this gearbox can be found here: http://sariel.pl/2009/04/2-speed-automatic-gearbox/#more-613