Inversed Timing Belt transmission

I had an idea for a compact gearing mechanism the other day. It is light, compact and has no backlash (that I've noticed). The next step is to see how it behaves under load. The inner pulley is 20 teeth, the outer ring is 120 teeth, the belt is 150 teeth.

I have only found this mentioned in one place, in the conference paper "ePaddle mechanism: Towards the development of a versatile amphibious locomotion mechanism". Please let me know if this is more well-known through another name.

UPDATE 1: Turns out there is an expired patent for a very similar design that seems to eliminate belt detachment at the cost of less contact area: https://patents.google.com/patent/US5...

UPDATE 2: Hehe, after around 2 years this went somewhat viral. I've uploaded a second video showing the first run of this prototype to my channel.

• #science_technology
• #timing
• #belt
• #gearbox
• #transmission
• #inverse
• #inversed