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Garrie L Hill
human power supergeek

USA
1689 Posts

Posted - 07/19/2017 :  05:26:39  Show Profile  Reply with Quote
Since the average rider of our HPV's has fractional horsepower output, it is extremely important to not waste any watts in rotational friction. The bearings in the wheels, bottom bracket, etc. can waste power if not installed properly. This becomes extremely relevant when building those non-standard bits for your recumbent that use bearings.

For you non-ME's, rather than "Put it together and see if it works", here's a nice little site that will give some good tips ( with illustrations and links ) on the subject of pre-loading bearings. Also, make sure you click through to the FAQ link..... more good info on bearing terminology and application. No, I don't have any commercial connection to this company. I'm just hoping to spread the informational wealth!

http://www.astbearings.com/blog/2016/06/preloading-ball-bearings-full-ast-guide/

Garrie "carbon based lifeform" Hill
HPRA Co-Dictator of the East
for pics of some of my time and money sucking projects
http://s58.photobucket.com/albums/g277/cfbb/
and videos
http://vimeo.com/5513519


alevand
human power expert

USA
2872 Posts

Posted - 07/19/2017 :  13:47:32  Show Profile  Visit alevand's Homepage  Reply with Quote
"FAQ

How much preload should be applied?

In general, provided the design requirements are met, the least amount of preload is desired

What are the benefits of preload?

Rotational accuracy and precise shaft positioning, elimination or reduction of ball skidding, control and reduction of axial and radial deflection under applied load, noise reduction, load sharing between bearings

Does preload have any effect on a bearings operational life?

Bearing life decreases as preload is increased

What other side-effects of preload should I know about?

With increased or excessive preload, stresses are higher and excess heat is generated
"

C:
Tony Levand
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Garrie L Hill
human power supergeek

USA
1689 Posts

Posted - 07/19/2017 :  18:22:56  Show Profile  Reply with Quote
Tony;

Allo of which means, do it correctly the first time.


Garrie "carbon based lifeform" Hill
HPRA Co-Dictator of the East
for pics of some of my time and money sucking projects
http://s58.photobucket.com/albums/g277/cfbb/
and videos
http://vimeo.com/5513519


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