Posted by ScottyHOMEy on February 07, 2010 at 11:16:01 from (64.222.221.197):
In Reply to: governor mystery? posted by mike paulson on February 07, 2010 at 10:40:38:
This is necessarily basic.. There are other ways to do it (like on small engines) but the Farmall model is what it commonly called a flyball or centrifugal governor.
Did you ever see an engine that had three or four balls spinning in a circle on top with arms above and below them, kind of a whirligig affair? That would be its governor. Given their head, the tendency of the balls, unrestricted, as they spin is to spin as fast as they can, (think of an ice skater with his/her arms tucked in) as close as they can to the center, allowing the motor to turn as fast as it can. To slow them down, the governor control pushes down on the assembly, which forces the ball weights outward making the whole deal spin more slowly, and restricting the speed.
The Farmall governor operates on the same principle. Only because the whole thing is encased and out of sight, it's not as pretty. It uses two rough cast but balanced weights. The shape they are cast in allows them do act on a linkage to the carb to adjust the fuel flow. That linkage is housed inside the pipe you see surrounding it. How far out the weights are allowed to spin is controlled by the throttle/governor control/speed control lever that you operate from the seat. So, if the motor slows down under a load, the gear turning those weights will slow down, too. But the momentum on those weights will make them want to stay inward, spinning at the whole speed they were making. And they will do just that, and compress a carefully engineered spring built into the shaft they spin around, with the spring tension such that the momentum of the weights can overcome it, with the compression of the spring allowing the weights to move to add more fuel to keep the engine up to speed.
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