divided into three categories, namely: yaw bearings, variable propeller
bearings, bearings Transmission System (spindle bearing and gearbox). Yaw
bearings installed in the tower and the cockpit of the junction, bearing
variable propeller blades installed in each wheel connected with the root site.
Each wind turbine equipment with a yaw bearings and bearing three sets of
varying paddle (part-megawatt-class wind turbines for the following Thrust Cylindrical Roller Bearing
Thrust Tapered Roller Bearing
non-adjustable blades, can not change propeller bearings).
1, code-named methods
Wind turbine yaw, and change paddle bearing the code method used JB / T
10471-2004 Wheel bearings in the way the code, but the wind turbine yaw, and
change in the propeller bearing a double row 4:00 Wheel contact ball bearings,
And this structure bearing the code in JB / T
10471-2004 not, therefore, the increase of
double standards in the four-point contact ball bearings dial the code name. In
single-row four-point contact ball bearings turntable with the structure of the
code 01, 02 and the structure of the code that is different-diameter dual-wheel
bearing structure, and therefore provides 03 that double 4:00 contact ball
bearings Wheel structure.
2 technical requirements
2.1 Materials
The standard deviation, and change the
propeller bearing rings material selection 42 CrMo, heat treatment used for the
overall quality treatment, after the transfer of hardness for the 229 HB-269HB,
Rolling Road,
part of a surface hardening, hardening hardness for the 55 HRC-62HRC. As the
wind turbine yaw, and change the propeller bearing the complexity of the
situation, and bearing to bear the shock and vibration comparison, therefore,
can withstand shocks bearing requirements, can withstand greater loads. Host
life requirements of the wind turbine 20, bearing the cost of installing larger
and therefore called yaw, propeller bearing life have changed to 20. Bearing
Ring-such as the hardness of 229 HB-269HB, able to withstand shocks without
plastic deformation, while Raceway part of quenching the hardness to the
surface 55 HRC-62HRC, increase contact fatigue life, thus ensuring long-life
bearing the application requirements.
2.2 low-temperature impact energy
The standard of yaw,
and change paddle wheel bearing rings low-temperature impact energy
requirements: -20 ℃ Akv not
less than 27 J, cold under the Akv value can be determined in consultation with
users. Wind turbine could work in extremely cold areas, the ambient temperature
as low as -40 it around, bearing temperature in the work of around -20 ~ C,
bearing in low-temperature conditions must be able to withstand the impact of
the load, therefore, requested Bearing Ring In the transfer of the material
after work to be done low-temperature impact test, for bearing rings on the
kind pieces or made part of the Rings is the same performance and heat
treatment under the conditions of the same kind pieces, in -20 ~ C environment
to impact Reactive test.
