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Looking for ideas to mount gears to wheels

Need some help,

I am in the progress of building a robot which will use 2 lawn mower wheels on a single shaft. I am using this method due to the final weight of the robot (~100 lbs) and the fact that I was concerned with radial torque I would have if I tried to drive the wheels directly with a coupler or such.

Each wheel is to be driven separately by their own drive motors. I am thinking of using a large metal gear, maybe from a bicycle, and chain driven, but have not been able to figure a way to mount the gear to the wheel. Any help is greatly appreciated. Also looking for sources for large metal gears say 4-5" in diameter.

Daryl

Reply to
daryl wilde
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Use a key and keyway, which is what everybody does in industrial machinery. Find out what a Woodruff key is. You can machine a keyway into the shaft with an appropriately sized grinding wheel on a Dremel tool. Although it's far easier with a milling machine.

John Nagle

daryl wilde wrote:

Reply to
John Nagle

Thanks for the info but this is not my issue. I need to faster the gear to the wheel - not the shaft. The gear and wheel when fastened together will turn freely on the shaft on till hooked to the drive belt.

Thanks Again Daryl

Reply to
daryl wilde

Front drive gears on a bicycle typically have a 5-bolt pattern where they bolt on to the 'spider' of the crank.. You could easily find a pair of small ones that you could bolt directly to the wheels with maybe a couple of washers to make room for the chain. Cruise around your local bike-shops and look for a junk box. Lots of bits get tossed that aren't up to the demands of 200lb trunk-thighed cyclists that'll work just fine for your bot.

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