Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Efficiency of chain gear

Efficiency of chain gear

Efficiency of chain gear

How to calculate efficiency of chain gear? (Does any table exist?). I need it for calculation of electromotor power.

RE: Efficiency of chain gear

I assume you are using standard roller chain and different size sprockets to achieve a change in speed?

I usually use 60% efficiency as a 'rule of thumb' to get back to the required motor power. I find the tables very wide ranging so you don't have to be fanatically accurate with this sort of thing.

Lester Milton
Telford, Shropshire, UK

RE: Efficiency of chain gear

I think 60% for a roller chain drive is way too conservative. I think the riders in the Tour de France would be rather upset to learn that 40% of their efforts were being wasted in heating up their chain wheels! Freshly lubricated roller chain is typically around 97 % efficient at least, but it drops off after the initial lubrication. I'm sure someone has studied this from first principles, but it wouldn't be too difficult to do an analysis if it can't be located. I would guess that it would be highly dependant on the coefficient of friction used (ie lubrication), and the ratio between pin size and wheel diameter. Silent chain has more of a rolling action, and should be even more efficient. Given the coefficient of friction, I might be able to come up with an approximate formula if you are still interested and no one else responds.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close