is the general graphic representation of the equation: µ
= (f) ZN/P, where µ (the coefficient of friction
in a journal bearing) is a function (f) of the
dimensionless parameter ZN/P, (viscosity x speed)/pressure. This is the
fundamental lubrication equation, in which the coefficient of friction is
the friction per unit load, Z the viscosity of the lubricating oil,
N the rpm of the journal, and P the pressure (load per unit
area) on the bearing. The ZN/P curve illustrates
the effects of the three variables (viscosity,
speed, and load) on friction and, hence, on lubrication.
Also see boundary
lubrication,
full-fluid-film lubrication.
Application
Notes:
