LINEAR MOTION SYSTEMS

Simplicity ® Plane Bearings
Calculation Bases- Polymer Series
Linear Motion Systems
AVERAGE LOAD
The active radial force affecting the plane bearing and the
projected supporting surface combine to the average load.
The value results from this formula:
SLIDING SPEED
Sliding speed is either the direct result of the linear speed or
with rotating movements results from the revs:
or with oscillator movements result in:
PERMISSIBLE PV VALUE
The permissible PV value is the product of sliding speed
and the corresponding load allowance. With polymer plane
bearings the PV value can be determined via the following
formula:
The following correction factors apply:
BUSHING WALL
THICKNESS s
k 1 k 2
2 mm 0.50 0.042
> 2 mm 0.75 0.058
The following thermal conductivities have to be applied to the
shaft material:
MATERIAL
SHAFT THERMAL
CONDUCTIVITY [W/mK]
Aluminum bronze 120
Aluminum alloy 156
Brass 80
Bronze 46
Carbon Steel 46
Cast iron 60
Low alloy steel 55
Phosphor bronze 75
Stainless steel 15
Calculation Bases
and
The permissible PV value should be greater or equal to the
PV value formulated from speed and load data for the final
application!
LIFE EXPECTANCY OF A PLANE BEARING
To calculate the service life the complete group of possible
strains must be taken into consideration. If in doubt, talk to a
member of our skilled and experienced technical staff. They
will help you interpreting and calculating the length of
service life.
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.
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