Formula for force requred to extract a bushing from a pulley
Formula for force requred to extract a bushing from a pulley
(OP)
Hi,
I am looking for a formula to calculate the minimum force required to pull a press fit bushing from a pulley.
Thx,
I am looking for a formula to calculate the minimum force required to pull a press fit bushing from a pulley.
Thx,





RE: Formula for force requred to extract a bushing from a pulley
RE: Formula for force requred to extract a bushing from a pulley
I have the dimensions for the interference fit(0.0005in) and a good estimate of the coefficient of friction(u=0.20) as well as the nominal dimensions of the bushing and pulley. I just can't find the formula to calculate the force to pull. Assuming I have the interference & the coefficient of static friction, what would be the formula for force required? Would I just calculate the pressure(P) and divide that by the area(A) to get the force(N) and plug that into the formula for the Friction force(F) F=uN?
Thanks
RE: Formula for force requred to extract a bushing from a pulley
RE: Formula for force requred to extract a bushing from a pulley
Here are the formula you need:-
Pa= f*3.142*d*L*Pc
where f=friction coefficient
Pc=contact pressure between the two members
d= nominal shaft dia
L=length of external member.
Pa= axial force required to interference fit
to calculate Pc for a given interference use the formula:-
Pc=x/[Dc*[((Dc^2+Di^2)/(Ei(Dc^2-Di^2))+....................
((Do^2+Dc^2)/(Eo*(Do^2-Dc^2))-((Ui/Ei)+
Ui/Eo))]
where x = total interference
Dc=dia of shaft
Di = dia of inner member(this is zero for solid shaft)
Do= outside dia of collar
Uo=poissons ratio for outer member
Ui=poissons ratio for inner member
Eo=modulus of elasticity for outer member
Ei=modulus of elasticity for inner member
This formula for Pc will simplify if the materials are the same.
Hope this helps
regards desertfox
RE: Formula for force requred to extract a bushing from a pulley
Fram = (greater than or equal to) pi*D*H*Shear.
where pi = 3.14
D = O.D. of bushing
H = length of contact engagement in pulley
Shear = ultimate shear stress of bushing material.
particularly if the bushing material is softer than the pulley parent material.
RE: Formula for force requred to extract a bushing from a pulley