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GLYCODUR F
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Determination of 
Bearing Size

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Design - pv-range - Calculation procedure nominal service life - Surface load - Velocity - Load capacity - Load factor - Temperature - Roughness - Example

Determination of bearing size

Calculation Example for Determining the Nominal Service Life

Calculation procedure

The suspension of a railcar to be equipped with paired GLYCODUR® plain bushings.


Design data:

Bolt diameter:
d 20 mm
Mean roughness of
pin:
Ra 0.3 µm


Operating data:

Radial load at the
linkage point:
Fr 13750 N
Half angle of
oscillation:
ß 0.6°
Oscillating frequency:
f 250 min-1
Operating temperature:
t 30 °C

Based on the design criteria, bearing PG 202320 F with a dynamic load capacity C = 30500 N is selected. It is necessary to check whether the bearing can be used at the given operating conditions and to determine the nominal service life.

For the first check consider the pv diagram:


Specific bearing load

p = K ×
F

C
= 80 ×
13750

2 × 30500
 ≈ 18 MPa
  with K according to table Specific surface load


Sliding velocity

v = 5.82 × 10-7 × d × ß × f
= 5.82 × 10-7 × 20 × 0.6 × 250
= 0.0017 m/s
   
These values are within the permis-sible area I in the pv diagram for GLYCODUR® F bearings.
The following factors result:
Load factor c1 = 1
Velocity factor c2 = 1
Temperature factor c3 = 1
Roughness
factor c4
= 0.8
Load distribution factor c5 = 1 *
KM = 480
n = 1
(as pv = 0.05 < 1)
* Due to the small oscillation angle, a practical point-focal load has been assumed.


 
Nominal service life

 
Gh = 1 × 1 × 1 × 0.8 × 1 ×
480

(18 × 0.0017)1
= 12550 Operat.hours.

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