Wind turbine shaft support
in the spindle position on wind turbines uses a fixed end double row
self-aligning roller bearings is not a worthwhile program priority
programs, and in future designs should be avoided. Although
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not a generally accepted maximum limit determined, but is generally
believed that the allowable double row self-aligning roller bearings to
withstand axial and radial forces of the maximum ratio between 0.15 and
0.20. That is, the radial force of the axial force only 15% to 20%. In
some applications, this ratio can reach 0.3 or 0.35, but there may be
one from power, two uneven stress, the roller inclination, cage
distortion, excessive heat, etc. roller peeling spot. As
the wind turbine main shaft end bearing of the force ratio is generally
about 0.6, which causes only a radial and axial force that is in
accordance with the original design of the bearing can be operated in a
manner, it must be considered the other fixed end bearing solutions to improve performance and reliability.
paper focuses on the end of the spindle position in wind generators
with double row tapered roller bearings, and the other side with
cylindrical roller bearings program benefits. Analysis
showed that the use of preloaded double row tapered roller bearings can
improve the rigidity of the spindle, thereby reducing the bearing
raceway and the gearbox input parts from the possibility of false
and optimize internal clearance even in the most extreme wind
conditions, ensure a good stability of the system, the shape of the
raceway is optimized even at very large eccentricity under normal use.
Comparison of spindle bearings
There are a number of wind turbines in the spindle position using
two self-aligning roller bearings. Fixed
end-aligning roller bearing axial and radial force, the floating
end-aligning roller bearings can only support radial forces. Install two
have some bearing radial clearance. Installation clearance of the
bearing axial and radial stiffness has an important impact. Therefore,
the spindle radial offset and axial movement of the bearing clearance
and will be subject to the initial impact with the shaft hole. Reduce
the radial bearings and offset to improve system performance as a whole.
a preload the fixed end of the double row tapered roller bearings, the
floating side using cylindrical roller bearings for wind turbines is a
better spindle bearing arrangement forms.
shaft bearing arrangement includes a fixed end and a floating terminal,
double row tapered roller bearings Cylindrical roller bearings plus
program compared to two self-aligning roller bearings program has a
great advantage because:
1, double row tapered roller bearings provide very good radial and axial load carrying capacity.
2, preloaded double row tapered roller bearing load zone improved in order to better distribute the load improves sample life.
3, double row tapered roller bearing clearance is preloaded, provides a good static and dynamic rigidity.
Double row tapered roller bearings Cylindrical roller bearings plus program has the following benefits:
1, reducing the axial offset of the spindle.
2, to maximize the stiffness.
3, due to optimized the preload, maximize and bearing load zone adjusted life.
4, preloaded tapered roller bearings at runtime is pure rolling to reduce the roller slip.
5, the axial offset is reduced thereby reducing the rolling fatigue risk of damage.
6, thereby reducing the axial displacement under static load reduces the possibility of false impression.
7, thereby reducing the axial displacement of the axial compression reduces the gearbox input shaft risks.
double row tapered roller bearings optimized raceway shape can be at a
relatively high eccentricity case of normal operation. Acknowledgements
We sincerely thank Mr. Gerald Fox (Timken's chief technical expert) guidance and contribution to this article.