Ratings Simplicity ® Plain Bearings
Classes of Plain Bearings Simplicity bearings are in a class of bearings known as Plain bearings, which means that they have no rolling elements. There are three classes of Plain bearings: Class I – Require an outside source of lubrication (oil, grease, etc.). Class II – Lubrication is impregnated within the walls of the bearing. (Bronze, powder metal, etc.) Typically, these bearings require an added lubricant also. Class III – Self-lubricating bearings, which do not require added lubricants. Simplicity bearings are Class III Plain bearings and are self-lubricating. Rating a Plain Bearing Plain bearing performance capacity is rated by PV. P = P ressure or load in pounds per square inch (psi) or kilograms per square centimeter (kg/cm 2 ). V = V elocity or surface speed in feet per minute (fpm or sfm) or meters per minute (m/min.). PV = Pressure velocity value (Pressure x Velocity).
W
Projected Area: A = L x d (Approx. 1/3 or total liner surface area)
L
n
d
W = MAX load L = bearing length d = shaft diameter
A = projected contact area n = rotational speed (rpm)
Formulas for Ratings Pressure is over the projected area of load: A = L • d P = W psi (or kg/cm 2 ) A Velocity: Linear = total distance traveled in one minute Rotational Velocity: V = p • d • n fpm (or m/min.) 12 Pressure velocity value (PV): PV = P • V psi • fpm (or kg/cm 2 • m/min.)
Simplicity Maximum Parameters
Maximum Parameters
V Running Dry
PV
P
10,000 psi x ft./min. or 215 kgf/cm 2 x m/min. 20,000 psi x ft./min. or 430 kgf/cm 2 x m/min.
140 sfm or 42.67 m/min. 300 sfm or 91.44 m/min.
1500 psi or 105.45 kgf/cm 2
Frelon ® J
3000 psi or 210.9 kgf/cm 2
FrelonGOLD ®
Note: All three parameters must be met by an application for the bearing to perform properly.
PV equivalents
Technical Metric
Int’l Metric (SI)
Inch
.0703 kgf/cm 2
.0069 N/mm 2
Load
1 psi
Velocity
1 ft./min.
.3048 m/min.
.00508 m/sec.
PV
1 PV
.0214 PV
.000036 PV
FrelonGOLD MAX PV
20,000
430
.72
Frelon J MAX PV
10,000
215
.36
138 Round Shaft Technology • pbclinear.com
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