As we know, bearing is an important part of diesel generator set and has
a huge influence on the service life of diesel generator set, so what
is the requirements of diesel genset bearing? Starlight Power generator
manufacturer answers for you.
Because
transmission accuracy of the bearing is low , and diameter of the ring
gear and the module of the gear is bigger, the accuracy level of the
gear is generally required to be 9 or 10 in GB / t10095.2-2001. However,
due to the influence between the pinion and the bearing ring gear in
the working state, the tooth surface of the bearing ring gear should be
hardened, and the hardness of the pinion tooth surface is generally 60
HRC. Considering the equal life design, the hardening hardness of the
gear tooth surface of the large gear is specified as no less than 45
HRC.
Yaw and pitch bearings have special requirements on clearance. Compared with the yaw bearing, the impact load of the pitch bearing is relatively large, and the vibration is also large when the wind blows on the blade. Therefore, the clearance of the pitch bearing is required to be zero clearance or slightly negative clearance, so that the fretting wear of the bearing can be reduced under the condition of vibration.
The yaw bearing is required
to have a small clearance value, i.e. 0-501m. In addition, since the
yaw and pitch bearing of the wind turbine are driven by the driving
motor, the bearing shall ensure the driving motor can drive under the
condition of negative or small clearance, so the bearing needs to
measure the starting friction torque without load after assembly, and
the specific torque value varies according to the different driving
system of the host machine.
The
wind turbine equipment works in the field, and part of the yaw and
pitch bearings are exposed to the outside, which will be polluted by the
atmosphere, and the high humidity environment will also corrode the
bearing matrix. Therefore, the exposed parts of the yaw and pitch
bearings require the surface anti-corrosion treatment, generally
galvanized treatment. Paint protection on the outside of the zinc
coating as required.
The
standard requirements for low temperature impact energy of bearing
rings of yaw and pitch turntable: Akv at 20 ℃ shall not be less than
27j, and the Akv value under cold state can be determined through
consultation with the user. The wind turbine may work in extremely cold
areas. The ambient temperature is as low as about 40 bar. The working
temperature of the bearing is about 20 ~ C. the bearing must be able to
bear large impact load under low temperature conditions. Therefore, it
is required that the material of the bearing ring must be subject to low
temperature impact power test after the tempering treatment. Take part
of the bearing ring to make samples or have the same performance and
phase with the ring For the samples under the same heat treatment
condition, the impact energy test shall be conducted under the
environment of ± 0 ~ C.
The above is the bearing standard of the 500kw electric generator.
Only by meeting the above standards can the operation of the diesel
engine generator be better guaranteed and the service life of the
generator set be prolonged.
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