One way slipping gear for RC cars

This is a part that I need for my automatic 2 speed gearbox (my first attempt is here).

The current version of the gearbox works as intended for a medium load (the gear ratio changes from 1:1.8 to 1:1) but for a high load the differential adder starts to back drive and can even dissipate all power.

Now the plan is to have a 2 speed automatic gearbox when driving forward but the reverse will have a single speed (the gear ratio will stay at 1:1.8) by using this new slipping gear.

The sprag clutch center needs to be printed in PETG because PLA is too stiff and resistance will be (too) high and as PLA is also quite brittle it will eventually break under load.

If you need to change the blocking direction, flip over the center and the poles (QTY 3).

I had previously made a slipping gear  and a sprag clutch. This is a  combination of both, namely a slipping gear that works in only one direction. If you compare the 3 designs you will notice that the clutch in the slipping gear has been integrated in the sprag center. So the rotation in one direction will use the clutch part (it will slip with a medium load); if you try to rotate it in the other direction the sprag poles will lock (no rotation).

I also added a snap fit cover to avoid losing the small parts while mounting this in the bigger assembly.

I had previously made a slipping gear  and a sprag clutch. This is a combination of both, namely is a slipping gear that works in only one direction. If you compare both designs you will notice that the clutch in the slipping gear has been integrated in the sprag center. So the rotation in one direction will use the clutch part (it will slip with a medium load); if you try to rotate it in the other direction the sprag poles will lock (no rotation).

I also added a snap fit cover to avoid losing the small parts while mounting this in the bigger assembly.