Catalogues - skf-spherical-plain-bearings-rod-ends-4407-ii-e

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

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2 Recommendations

3 Product data

1 Product information

Page................4 Basic rating life Page..............57

Load direction factor b₁ for sliding contact surface combination steel/sinter bronze composite


	Table K_
	Type of load Factor	Permissible specific bearing load¹'
	- - N/mm²
	Constant load²⁾ Single direction 1
	Variable load Alternating direction or pulsating magnitude at a frequency up 0,5 Hz 0,4 over 0,5 up to 5 Hz 0,2	40 to 60 25 to 40
	2 Inertia forces should also be taken into consideration ² For constant load, oscillating frequencies above 300 min^-1 and very short sliding distances, b₁ = 1 can no longer be used because of possible material fatigue; please contact SKF for guidance

Maintenance-free sliding contact surface combination steel/sinter bronze composite

1 400

p^1,3 v

Gh = bi b2

G = 60 f G_hwhere

G = basic rating life, number of oscillations

G_h= basic rating life, operating hours b = load direction factor

(- Table |6 ) b₂ = temperature factor Diagram

B3 )

f = frequency of oscillation, min ¹p = specific bearing load, N/mm²v = mean sliding velocity, m/s

Temperature factor b₂ for sliding contact surface combination steel/sinter bronze composite

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.

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