Inventor General

## Inventor General

Active Member
Posts: 8
Registered: ‎11-01-2012
Message 1 of 6 (733 Views)

# Modelling bicycle gears

733 Views, 5 Replies
11-05-2012 07:18 AM

Hi,

My question:

How can I create bicycle gears that have different numbers of teeth but all have an intertooth distance (distance between the teeth centres) of 12.7mm?

My attempt at a solution and problems encountered:

I made a bicycle gear by patterning a small circle around a large circle then trimming lines (see attached sketch), but this method requires me to estimate the diameter of the large circle before patterning and then keep modifying this slightly until I get an intertooth distance as close as possible to 12.7mm. So I can't get exactly 12.7mm. In my sketch I have labelled this intertooth distance I refer to by construction lines.

*Expert Elite*
Posts: 25,288
Registered: ‎04-20-2006
Message 2 of 6 (728 Views)

# Re: Modelling bicycle gears

Why not use the Roller Chain Spocket Design Accelerator?

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*Expert Elite*
Posts: 25,288
Registered: ‎04-20-2006
Message 3 of 6 (722 Views)

# Re: Modelling bicycle gears

11-05-2012 07:34 AM in reply to: JDMather

In any case, I would not create a complex sketch like that.
It is better to pattern features than to pattern sketch.

If you Right Mouse Button - Show All Constraints - you will see that there are too many constraints that would have to be solved.

-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2014 Edu 64-bit
http://www.autodesk.com/edcommunity
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Active Member
Posts: 8
Registered: ‎11-01-2012
Message 4 of 6 (713 Views)

# Re: Modelling bicycle gears

11-05-2012 07:57 AM in reply to: JDMather

The shape of the teeth is not the shape I want to use. I also need to model a specific chain type. Though I could try and edit them to suit my needs.

*Expert Elite*
Posts: 25,288
Registered: ‎04-20-2006
Message 5 of 6 (696 Views)

# Re: Modelling bicycle gears

I also need to model a specific chain type. .

What is the chain type?

You could examine the attached file and alter it (or start from scratch) using the basic technique.

-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2014 Edu 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
Posts: 8
Registered: ‎11-01-2012
Message 6 of 6 (685 Views)

# Re: Modelling bicycle gears

11-05-2012 08:46 AM in reply to: JDMather

A Shimano CN HG94 chain. It's a very narrow chain and is also not symetrical. I might just pick the narrowest chain with 12.7mm pitch that the design accelerator offers.

Thanks.

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