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Date Posted: 09:52:58 05/11/05 Wed
Author: Glenn Gordon
Author Host/IP: 199.174.180.122
Subject: Gear Problem

Hi,

I spend my days designing modular buildings so this gear problem is a bit out of my realm of experience. I am looking for some help designing a gear set for an invention of mine. I know gear design basics, but this is beyond what I know. Any help would be greatly appreciated. The needed gears (to be made from plastic) are part of a kids toy that I am developing on my own time and with my own money.

For my prototype, I will need to make a 3D solid model in AutoCAD and will export it for fabrication perhaps via stereo lithography.

I need two identical gears which combine to create a beveled helical gear set. As far as I can tell, the relationship of these two gears will not permit a straight spline design.

Here are a couple of drawings (top view and front view) that will better describe what I need for this project.... (NOTE: The gears in the pics will not mesh and are only shown to describe the geometrical relationship of the two gears.

http://www.gsg.microminutes.com/images/gear 1 of 2.jpg
http://www.gsg.microminutes.com/images/gear 2 of 2.jpg

The angular dimension on the first drawing is 48 degrees.
The angular dimension on the second drawing is 12 degrees.

I found the equations for designing "Helical Gears for a given shaft angle with equal center distances", and I found equations for designing Bevel Gears. I couldn't find equations that covered a combination of the two.

I have found several programs that will help to create gear models, however none of them will handle this type of design.

So my question is how do I go about designing beveled helical gears?

Thanks for your help.


-Glenn

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