Bearing Materials

GLYCODUR F
GLYCODUR A+AB
Special Materials
Properties

Bearing Technique

Determination of
Bearing Size
Tolerances
Installation

Dimension Tables

Overview

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:

20 mm

Mean roughness of
pin:

R_a

0.3 µm

Operating data:

Radial load at the
linkage point:

F_r

13750 N

Half angle of
oscillation:

0.6°

Oscillating frequency:

250 min^-1

Operating temperature:

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 ×

= 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 *
K_M	= 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

G_h = 1 × 1 × 1 × 0.8 × 1 ×

480

(18 × 0.0017)¹

= 12550 Operat.hours.

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