How to Build a Go Kart - 6 Important Notes About Belt Drives
Many people have zero money, but this mega thirst for any go kart. The belt drive might be one from the most cost effect drive system that you could implement, on the low cost cheap go kart.
There are, however, issues which has a belt drive that want to get understood ahead of just diving in and making this belt drive system.
First thing to comprehend may be the final drive ratio. Is the engine going to get in a position to turn this technique or will it stall. Keep planned the rpm for engagement is typically not very high, like 1200 rpms. So your calculation has to reflect that. The HP curve on an engine is approximately linear, so when the rpms are decreased, then this HP has to decrease accordingly.
For example a 5 hp motor will create 87.5 in-lbs of torque at 3600 rpms. But exactly the same engine will released only approximately 1/3 of that at 1200 rpms (29.1 in-lbs of torque.)
Keep that in your mind or you will be sorely disappointed when the go kart repeatedly stalls or burns up belts.
The second thing to know is which a belt clutch is quite very challenging to belts. Especially when neutral drops or high rev engagement are executed repeatedly. The ideal would be to hold the belt engage on the lower rpm and then have the engine lug up towards the desire cruising speed.
The third thing to comprehend is the simple fact that pulleys are sensitive to heat build-up and may if not selected properly fly apart or melt. The zinc die cast pullies, especially the tiny ones, are made for fractional horsepower motors such as electric fans so forth.
The sudden engagement will heat up the pulley to 300+ degrees F and cause the zinc or aluminum to melt and fly apart. Be guaranteed to invest inside a high quality steel pulley, especially if the pulley is getting used being a clutch driver.
The fourth thing is the very fact that there is certainly much debate over making belts go around corners, do twists or all types of design gymnastics, nevertheless the truth with the matter is belts are made to flex and carry loads.
The fifth thing is "What kills a belt?" Four things kill belts:
1. Sudden engagement (shock loads)
2. Prolonged Slipping
3. Poor Tracking
4. Improper load tension sizing
If you retain these four issues in balance you may have a very long-lasting go kart drive system that will last years instead of weeks. And finally, belt drives, especially clutch belt drives, are extremely driver dependent. Like a clutch with a car, one poor engagement can wreck a clutch, a similar goes with belt drives.
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