Inventor General Discussion

Inventor General Discussion

Reply
Active Member
AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 1 of 6 (953 Views)
Accepted Solution

Modelling bicycle gears

953 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.

 

Thanks in advance.

*Expert Elite*
JDMather
Posts: 26,656
Registered: ‎04-20-2006
Message 2 of 6 (948 Views)

Re: Modelling bicycle gears

11-05-2012 07:25 AM in reply to: AdskInv

Why not use the Roller Chain Spocket Design Accelerator?

 

Roller Chain.PNG

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
*Expert Elite*
JDMather
Posts: 26,656
Registered: ‎04-20-2006
Message 3 of 6 (942 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. 

 

All Constraints.PNG

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 4 of 6 (933 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*
JDMather
Posts: 26,656
Registered: ‎04-20-2006
Message 5 of 6 (916 Views)

Re: Modelling bicycle gears

11-05-2012 08:17 AM in reply to: AdskInv

AdskInv wrote:

 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.

 

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 6 of 6 (905 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.

Announcements
Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.
Need installation help?

Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.