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Generators for Compact Tractors
I have also been considering a 10kw belt drive generator. With your 18" and2.5" pulleys you will be turning the generator at 3888 rpm at 540 pto speed.This is ok if you don't want to run at pto speed, you won't have as much power. Also have you considered that small dia. pulleys do not transfer as much horsepower, even in a two belt configuration. I found a parts bookcalled Grainger, their also on the net, that has the set up that I've found to maybe work better than v-belts. They have flat 1.5" belts that are called "h"series belts. They have teeth just like a gear spaced .5" apart and you won't get any slippage.An 18.5" and a 2.85" pulley gives you exactly 3600 rpm at 540pto speed. Also this type of belt is good for up to 20hp. This total set up costs about $300. which includes pillow blocks gears and belt. I hope thishelps. I haven't ordered mine yet but I have done extensive studying on thissubject. If you've got yours completed let me know how it works. Thanks Jeff
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Generators for Compact Tractors
Sinse my previous message I have finished my belt drive gen. My gen is a 10 kw belt drive unit that I am putting on a 17 pto hp diesel tractor. After extensive studying, I decided to go with the 2" wide "h" series timing belt set up. This is like a timing belt on a car only 2" wide and teeth spacing .5" apart. You need a 6.6 to 1 ratio to step up from 540 to 3600 rpm. So I decided to go with a 24 tooth and a 156 tooth pulley set. This gives me a 6.5 to 1 ratio which is close enough. The 24t and 156t gears are 3.82 and 24.8 inches in dia. The 2" belt turning a 24t gear at 3600 rpm can transmit 30 hp which gives me with plenty of leeway. I mounted the 156t gear between two pillow blocks using a 2" shaft which is connected to the pto. (All this is mounted on a 3x3x3/8 angle iron frame.) I was suprised at how easy my tractor turned the big pulley and the gen. It also acts as a big flywheel, as it weighs 75lbs. When I start somethig big like a 3.5 hp motor, the big pully helps to power thru the startup, not slowing the engine at all. I don't know if you would get that benifit with a gearbox drive unit. All on all, it was a fun project and the outcome was better than I expected. If I can help anyone, drop me a line.
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Generators for Compact Tractors
I own a Massey Ferguson 1020 tractor with a 21 hp diesel engine. It puts out 21 hp at 2550 rpm full throttle. Pto speed is 17 hp at 2150 engine rpm. Pto speed is usually at an rpm that is about 15% less than max engine hp or rpm. At pto speed you can run for long periods of time without the risk of damaging the engine while leaving you with extra power when needeed. I don't think pto speed is set at the highest torque of the engine. It's just set at an engine rpm that combines power and engine life.
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Generators for Compact Tractors
I was able to get my hands on a complete parts book from Browning which is a major distributor of Power Transmission. It had all the formulas and charts in it that helps you to decide what pulleys and belts fit your need. I settled on the 2" "h" timing belt which gave me the hp transfer that I needed. About 30hp with the 24 tooth pulley which is 3.82" in dia. coupled with the 156t (24.8" . I also considered the 8 mm and 14 mm pulleys but found they were more expensive. Also Grainger didn't show anything over 120t and would not outsource even when Browning had what I needed and is one of their big supliers. Grainger was out. So I hooked up Bearing Dist. Inc. in Cincinnati and the guy there fixed me up with what I wanted from Browning. Cost $500. for all. That was pulleys, tapered bushings, 2" pillow blocks, and belt. Not cheap. But considering I have only $1100 in a 10kw pto gen., thats not bad. As for the whine? Over the noise of the engine, its really not that noticable. Not something I guess I considered when making my decission. Thanks for the positive input!! Jeff
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