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Unread 20-02-2007, 16:57
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Keyang Motor Gear Profile

Does anybody know what the gear profile is on the keyang worm gear motors (the power window motors) in the KOP, or where I can go to look up the profile? We need to buy 2 gears with a 4:1 ratio to the motor for our arm.
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Last edited by LieAfterLie : 21-02-2007 at 14:24.
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Unread 22-02-2007, 09:57
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Re: Keyang Motor Gear Profile

We used a 12 DP to match the Keyang
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Unread 22-02-2007, 10:23
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Re: Keyang Motor Gear Profile

They are not standard by any means. We ended up going at them with calipers and making a CAD model of the gear by hand. One of our team mentors was able to get them water-jetted and that's how we made them.

If you're interested, I can see if I can hunt down the CAD files. Even those weren't quite exact though, we pushed it through and arbor press a few times before it gave a nice clean fit.
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Unread 22-02-2007, 10:27
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Re: Keyang Motor Gear Profile

At those types of speeds 12 DP is a close fit. I believe Dr. Joe once mentioned that they're a stub tooth profile.
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Unread 22-02-2007, 10:57
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Re: Keyang Motor Gear Profile

The stub tooth was on the Nippon-Denso window motors. I'm unsure if the Keyang is the same, but you could buy a gear and try it. A stub gear uses one DP for the tooth thickness and number, and a second, smaller DP for the addendum, dedendum, pitch diameter, height, etc. So if a 12DP gear fits, then it might be a 12DP stub. In which case you'd might have a better mesh if you turned down the 12DP gear to the OD of a 14 DP gear. Ish. I think it's pretty complicated.
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Unread 23-02-2007, 17:00
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Re: Keyang Motor Gear Profile

Thanks. 12 it is, that's what I got too. Is the pressure angle 12.5 or 20? Does it matter? How do I tell? Would it matter if it's a stub gear? How do I tell? Anything else that would make it incompatible with a normal spur gear?

Could someone tell me some good sites to find aluminum or brass gears? I need 2 12 DP gears with about 36 teeth. McMaster, Grainger and RobotCombat only have steel ones that I could find, wich weigh about 2.5 lbs each with 3" pitch diameters, which is way too much. I don't want to have to drill out a whole lot.
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Unread 23-02-2007, 17:16
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Re: Keyang Motor Gear Profile

WM Berg
But I hope you have time and money. They list that particular combination as around $40 and the stock is either 2 weeks or "call berg"

EDIT: They appear to have minimal stock of a 12 DP, 3.5" PD gear, if that's an option
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