Five Requirements For Maintenance Of Gear Parts Of Diesel Generator Set

How to repair and inspect many gear parts in diesel generator set? The external and internal teeth of the gear, the spline shaft and the key teeth of the spline hole can all be regarded as gear parts. Common damages of gear parts include tooth length and tooth thickness wear, tooth surface spots, peeling, groove marks, and individual tooth cracks and fractures.

For the inspection of gear parts, inspection and measurement methods are generally used. The specific method of sample inspection is qualified if there is no light leakage or very little light leakage. For the inspection of the wear degree of key shaft and keyhole, the wear degree can be determined by the fit inspection method.

The general inspection requirements for gear parts are as follows.

① The spot and peeling of one tooth surface shall not exceed 20% of the whole tooth surface.

② The tooth length wear (measured at 2/3 of the tooth height) shall not exceed 30% of the original tooth length (the tooth sleeve shall not exceed 15% of the original tooth length).

③ The tooth thickness wear (measured at the pitch circle) shall not exceed 0.5mm (the tooth sleeve shall not exceed 0.4mm).

④ Generally, the fracture of gear teeth shall not exceed 1/3 of the tooth height, the fracture of two adjacent teeth shall not occur at the same time, and the fracture of the entire gear teeth shall not exceed 4.

⑤ Gear wear shall not have serious step shape.

In addition, if the worm gear and worm have cracks, fatigue peeling and trapezoidal wear and other failure forms, they should be replaced generally. The wear degree of worm gear and worm can be measured with special tools such as gear vernier caliper, limit gauge and special sample plate. The wear amount shall not exceed the standard.

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