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AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 1 of 6 (863 Views)
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Modelling bicycle gears

863 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.

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JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 2 of 6 (858 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

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JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 3 of 6 (852 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

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Active Member
AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 4 of 6 (843 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: 26,186
Registered: ‎04-20-2006
Message 5 of 6 (826 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.

 

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Active Member
AdskInv
Posts: 8
Registered: ‎11-01-2012
Message 6 of 6 (815 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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