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Re: [EVDL] Gizmo EV "gearing"

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Re: [EVDL] Gizmo EV "gearing"

I don't know what size pulley/"sprocket" is available in the belt you
describe, but my first call to locate info would be Applied Industrial
Technologies. They have branches across the US and maybe even further
around the world. They should be able to match up with what you have and
might even have a few in stock. The longest I have had to wait for anything
from them is 3 days.

No, I don't work for them, I just know they have access to lots of power
transmission solutions and I have seen the v cog belt you describe there.

Another option at least on the west coast is Motion Industries. They carry
similar lines as Applied.


----- Original Message -----
From: "David D. Nelson" <[email protected]>
To: <[email protected]>
Sent: Friday, August 24, 2007 7:17 PM
Subject: [EVDL] Gizmo EV "gearing"

> Hi all,
> I have a Gizmo EV ( which has a 48V
> pack and a 6.7" D&D Separately Excited Motor. I have
> run it for a year but the hill climbing I have to do
> has started to burn up the motor. Jim H has it right
> now to rebuild/repair. We had been considering
> installing a 7.5" motor to see if it would handle the
> workout I give it a little better.
> I decided to do some calculations to see what rpm the
> motor was spinning and here is what I found:
> Speed : tire rpm : motor rpm
> 10 : 171 : 514
> 20 : 343 : 1029
> 30 : 514 : 1543
> 40 : 686 : 2057
> 50 : 857 : 2572
> What I am wondering is if I can change the gearing to
> get a better than a 3:1 ratio maybe a 6:1 ratio will I
> still have the same top speed? Right now my top speed
> on the level is about 44mph. Jim, and I think he said
> Tim, thought that maybe the existing motor would
> handle my needs if the motor spun at a much higher
> rpm.
> My next question is, does any one have any suggestion
> as to where I might find some replacement
> gear/pulleys? This is a belt driven vehicle which has
> the "teeth" in a V shape like this:
> \\\\\\
> //////
> including the gap in the middle. The belt is a
> GoodYear Eagle W-1280. I also need to know what the
> smallest drive gear I can safely use. The current one
> is 30 teeth. The one on the drive wheel is 90 Teeth.
> I have attached 3 pictures. (I hope this doesn't
> violate list rules.) It appears that there are two
> sets of bolts which bolt the gear/pulley on the wheel.
> One set bolts to the wheel hub, then there is an
> aluminum adapter which then bolts to the gear it self.
> There isn't much room to go larger with the wheel's
> gear since the belt would interfere with a support. I
> think I could go to a 115 tooth at the wheel so if I
> could go as small as a 20 tooth drive it would be at a
> 5.75:1 ratio.
> David D. Nelson
> [email protected]
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