Bellcrank Pivot bearings

[goash]

I need help with selection of bearings for bellcrank pivot.

Our bellcrank remains in 1 plane for whole suspension travel so there wont be bending loads.

Also we will use needle roller bearings.
My only concern is, how can i calculate radial loads on the pivot? According to me it should not affect much as there is negligible rotation of bellcrank...

Thanks!

[Dash]

Its called a free body diagram.

Also, why needle roller bearings? Why not ball bearings, or how about bushings?

[goash]

I read in a machine design book regarding benefits of needle roller bearings..
1. Compact and light weight
2. Larger load carrying capacity (particularly at low speeds)

They also mentioned that needle bearings are ideal for applications which involve oscillatory motion like in case of piston pin, rocker arms etc...
I read on other topics that they prefer ball bearings over needle bearings just due to price factor..or is there any other reason ?

[Dash]

Originally posted by goash:

there is negligible rotation of bellcrank...

Thanks!

I am just trying to make you think. Why buy an expensive bearing ( or a bearing at all ) when you have stated this quote above?