It appears to be a standard design planetary gear set, except the planet=20 gears which normally have same number of teeth, are tapered teeth, and=20 there is a missing tooth (teeth) area to account for the tapered teeth.=20 Since there is the missing tooth area on all the planetary gears, they=20 must be meshed so that at least one tooth is in contact under load at=20 all times, but at least one, and probably 2 gears are not under load.=20 The strength (torque carrying ability) of a standard planetary gear set=20 (includes both the Sun, ring, and usually 3 planetary gears) is the=20 result of all planetary gears sharing the load. Here it appears, only=20 one planetary gear carries the full load, which means at least 1/3 the=20 load carrying ability. This could be less, since the standard planetary=20 gear set tends to deform under load to share the load. On 7/15/2011 4:11 PM, Gerhard Fiedler wrote: > YES NOPE9 wrote: > > =20 >> http://telaminc.com/page-title%207/cvtivt.htm >> >> I have looked at the video of this device and it is either misleading >> or I am missing something. At first I thought maybe it was using a >> harmonic drive scheme but now I am not so sure. Does the green ring >> with 3 holes have to move parallel to the green shaft to change the >> ratio ? Is there a solid shaft running through the blue gears to two >> smaller orange gears that mesh with single larger orange gear ? >> =20 > AIUI: The green shaft turns. The blue cones are connected to the green > shaft and turn inside that big green ring with the teeth inside (which > does not turn). The horizontal position of the green ring determines the > rotational speed of the blue cones, because their effective tooth number > changes with the position. The rotation of the blue cones is transmitted > to the orange output shaft through some yellow (?) gears inside that > orange output gear. > > So, yes, IMO the green ring needs to move horizontal (parallel to the > shafts) to change the ratio. > > =20 >> Is this real or a scam ? >> =20 > Looks real to me, but a bad drawing/animation to demonstrate the > function :) > > It seems that the special trick here is that the blue cones don't have > teeth all the way around, but the non-tooth areas are distributed in a > way that always at least one blue tooth has a grip against the green > ring. > > Not sure why John says they are not gears/teeth... > > Gerhard > =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .