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Catalogue SKF spherical plain bearings & rod ends (4407/II E)

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Basic rating life		Page..............57
Table (T
Type of load	Specific load	factor b₁
- N/mm²
Constant, single direction	up to 300	1
Varying loads (alternating, pulsating) at load frequencies up to 0,5 Hz	up to 50 50 to 100	0,55 0,4
over 0,5 to 1 Hz	up to 50 50 to 100	0,35 0,15
over 1 to 5 HZ	up to 50	0,1

Page

Load direction factor b₁ for sliding contact surface combination steel/PTFE fabric

Maintenance-free sliding contact surface combination steel/PTFE fabric

Gh = bi b2 b4 —---

where

G_h = basic rating life, operating hours

load direction factor (- Table ^) temperature factor (— Diagram M7) velocity factor

Diagram n8 , page 28) specific bearing load, N/mm²a constant for the specific bearing load Table p ) an exponent for the specific bearing load Table ) mean sliding velocity, m/s

Kp:

Temperature factor b₂ for sliding contact surface combination steel/PTFE fabric

Diagram 17

1,0

b₂

0,8 0,6 0,4 0,2

20 40

100 120 140 160

t °C


Table JT
Specific bearing load over incl.		Constant	Exponent n
N/mm²	-	-
	25	770	0,2
25	90	4 000	0,7
90	300	40 000	1,2

Constant K_p and exponent n for sliding contact surface combination steel/PTFE fabric

NB.

Calculation of the rating life considers the influence of the load and sliding velocity. Under very light loads and/or low sliding velocities, the equations will give relatively long service lives. However, the influence of environmental factors such as contamination, damp or moisture and corrosion increases in importance the longer the life so that deviations from the calculated life occur and in many cases the calculated life will not be attained.

5KF