Tablescrap: D+N+R transmission

[Hrafn]

A thought occurred to me and I wanted to get it down in rough form to share with others (and see what refinements they come up with).  I combined Sariel's two speed ratchet transmission with an old differential to create this drive+neutral+reverse automatic transmission.  Input is on the axle running through the 16t gear with chain.

Let me know if this has been done before - in retrospect it seems obvious so surely it occurred to someone else.

Edited June 9, 2021 by Hrafn
Added link to image

[2GodBDGlory]

I recall seeing transmissions with the same working principle (fast forwards, slow backwards), but not necessarily the same execution. Your design has a pleasing simplicity, but is still a bit difficult to understand from a picture. I also found that it ran much more smoothly with the 16T clutch replaced with a normal 16T gear, and the 4x2 beam replaced with two #1 connectors and a 2L axle.

Nice work!

[Hrafn]

Thanks!

On further reflection, though, the use of the differential is not really helpful - a basic ratchet transmission achieves the same effect in less space.

Edited June 10, 2021 by Hrafn