...Theory of Hydrodynamic Lubrication... cont from previous slide

• The total load bearing capacity per unit width is

After substituting h=h₁ - αx with α=(h₁-h₂)/ l in the above equation and performing the integration,

(27.14)

• The shear stress at the bearing plate is

(27.15)

Substituting the value of from Eq. (27.14) and then invoking the value of Q in Eq. (27.15), the final expression for shear stress becomes

• The drag force required to move the lower surface at speed U is expressed by

(27.16)

• Michell thrust bearing, named after A.G.M. Michell, works on the principles based on the theory of hydrodynamic lubrication . The journal bearing (Fig. 27.3) develops its force by the same action, except that the surfaces are curved.

FIG 27.3 Hydrodynamic action of a journal bearing