Ring gears are used because you can get a much better multiplication of force. The starter pinion gear can be very tiny while the ring gear is very large. Reductions of 12:1 or more are easy. With a pulley you can only go so small on the motor, and only so large on the crankshaft, limiting you to 4:1 or 5:1.
Ring gear starters aren't used as generators because when the engine is running, that gear reduction turns into a gear multiplication. When the engine is turning 1500RPM, the starter is doing about WARP 4. That'll last about 2.7 minutes without constant lubrication, which makes the whole thing way more complex than it really needs to be.
There isn't a starter-generator off the shelf that would turn over a 30HP engine without the crankshaft pulley being over 3' in diameter.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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