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B10 hi-lo

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The HI-LOW your asking about is an add on attachment that replaces the tranny pulley. This setup has a 2 position casing thats operated from a lever that sticks out from under the right side seat pan. The case houses a set of sun gears that when engaged reduces the input speed of the transmision shaft. This gives you 2 speeds in each gear.

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Following on what Dave said,,,,,, The Hi Lo is a planetary gearset. The vari-drive is similar to a snowmobile belt drive. You have a lever that changes the pitch of the drive pulley, and the driven pulley changes in pitch opposite the drive pulley. The problem is, if you want to add a vari-drive, the longer output shaft of the BGB and the longer input shaft of the transaxle are required to make this possible as opposed to simply adding the hi lo to the input shaft of the tranny.

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Thanks for all the info so far guys. I started a little research on it, is it like the top one on this page? (See link), right below the animation. The deceleration?, where it stops the sun gear and that in turn slows the ring gear rotation? granted this is a simple model, but is it the general idea? But does it spin while in high or lo?, depending on which way it is spinning it can either slow or speed the output, right? http://www.mekanizmalar.com/transmission.html

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It is somewhat similar, but the driving force (input) is coming from the belt around the perimeter, not the shaft in the middle. The shaft in the middle is the output, driven force. Both the belt and the output shaft always turns in the same direction. In High, the pulley does not change the gear ratio -- it is essentially a "direct drive" where the transmission shaft is spinning at the same RPM as the pulley. In Low, it "gears down" or "underdrives" as shown in the illustration you used. But, those planetary gears are on an plate that is separate from the hub of the pulley. The inside hub is held in a fixed location on the shaft, while the outside with the planetary gears and the belt groove can be slid in and out by the shift linkage. In High, there are teeth on the hub and the external plate that mesh, locking it into a "direct drive." When you shift to Low, that plate with the planetary gears slides, disengaging the fixed teeth from the teeth on the hub, and and it begins using the planetary gear action shown. All this is from memory -- it has been a few years since I had one apart.

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