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low gear ratios (25:1)

1472 Views 3 Replies 4 Participants Last post by  jwiger
I am designing a low speed(6mph) electric vehicle that will be used to transport loadings of about 400lb and will have total weight(loaded) of 1400lb. I will be using an electric motor with a 19 tooth spline from a golf cart and calculated I need a gear ratio of 25:1. However no rearend assemblies I can find are anywhere near this ratio. Does anyone know of a solution of how I can get such ratios or if such ratios exist? I know you can get large/low gear ratios with worm gear sets however I cannot seem to find any worm gear differentials.
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What's the budget here?

Is there a donor vehicle that you're starting with?

Is it two wheel drive or four wheel drive?

For a four wheel drive, on a budget, I would try using the transaxle from a garden tractor. just turn it 90 degrees so the wheel flanges are driving the input shafts of your front and rear axles. If you pockets are a little deeper you could try an Atlas 2 transfer case. The go down to 5.0:1 ratios.
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