Gears-efficient gearbox

[Zerobricks]

7 hours ago, TechnicRCRacer said:

Does it work well? It doesn’t look like it will run very smooth.

Try and find out :) It works quite smooth.

[technicmath]

Below is a possible solution to make this gearbox in a studless construction:

The orange 36-tooth gears need to be replaced by 28-tooth gears and the dark bluish gray driving ring should be the newer 3L version.

The 24-tooth gear at the bottom and at the right, the 12-tooth gear at the bottom and the 20-tooth gear at the right provide possibilities to go back in the studless grid. Or universal joints can be used to go from the axle through the 1 x 1 technic bricks back to the studless grid.

[AndyBell]

Came to this late, very late…  And came by way of google search.

I was already done with something similar but optimized for GBC rates 60/80//120.

https://reb.li/m/180337

I also have a couple other similar 4 speed gearboxes that maybe useful.

[technicmath]

Thanks to the new 12 tooth clutch gear, the above idea can be modified to an 8 speed gearbox. There are only 3 axles for the drivetrain.

In the video, one 12 tooth gear with clutch is missing.

gear 1: (12/24)*(16/28)=0.28...
gear 2: (12/24)*(20/24)=0.41...
gear 3: (16/20)*(16/28)=0.45...
gear 4: (16/20)*(20/24)=0.66...
gear 5: (20/16)*(16/28)=0.71...
gear 6: (20/16)*(20/24)=1.04...
gear 7: (24/12)*(16/28)=1.14...
gear 8: (24/12)*(20/24)=1.66...