LINEAR MOTION SYSTEMS

Simplicity ® Self-lubricating Bearings
Technical Information - Inch & Metric
Linear Motion Systems
CLASSES OF PLANE BEARINGS
Simplicity bearings are in a class of bearings known as plane
bearings, which means that they have no rolling elements.
There are three classes of plane 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 plane bearings and are
self-lubricating.
RATING A PLANE BEARING
Plane bearing performance capacity is rated by PV.
P - pressure or load in pounds per square inch (psi) or
kilograms per square centimeter (kg/cm 2 ).
V - velocity or surface speed in feet per minute
(fpm or sfm) or meters per minute (m/min.).
PV - pressure velocity value.
SIMPLICITY MAXIMUM PERIMETER
MAXIMUM
PARAMETERS
FrelonJ ®
FrelonGOLD ®
V
P
(RUNNING DRY)
1500 psi 140 sfm
or
or
105.45 kgf/cm 2 42.67 m/min.
3000 psi 300 sfm
or
or
210.9 kgf/cm 2 91.44 m/min.
NOTE: All three parameters must be met in order for the bearing to
operate properly.
PV
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.
n
FORMULAS FOR RATINGS
PRESSURE IS OVER THE PROJECTED AREA OF LOAD:
A = L x d
P = w psi (or kg/cm 2 )
A
VELOCITY:
Linear = total distance traveled in one minute
ROTATIONAL VELOCITY:
V = x d x n fpm (or m/min.)
12
PRESSURE VELOCITY VALUE (PV):
PV = P x V psi x fpm (or kg/cm 2 x m/min.)
W
W = max. load
L = bearing length
d = shaft diameter
A = projected contact area
n = rotational speed (rpm)
d
PROJECTED AREA:
A = L x d
(Approx. 1/3 or total
liner surface area)
L
Technical Information
PV EQUIVALENTS
INCH
TECHNICAL
METRIC
INT’L METRIC
(SI)
LOAD 1 psi .0703 kgf/cm 2 .0069 N/mm 2
VELOCITY 1 ft./min. .3048 m/min. .00508 m/sec.
PV 1 PV .0214 PV .000036 PV
FrelonJ ®
MAX PV
FrelonGOLD ®
MAX PV
10,000 215 .36
20,000 430 .72
The data and specifi cations in this publication have been carefully compiled and are believed to be accurate and correct. However, it is the responsibility of the user to
determine and ensure the suitability of Pacifi c Bearing® products for a specifi c application. Pacifi c Bearing’s only obligation will be to repair or replace without charge,
any defective components if returned promptly. No liability is assumed beyond such replacement. *Consult www.pacifi c-bearing.com for the latest technical updates.
800.962.8979 • www.pacific-bearing.com 37