The basic situation of the gear damage is similar, the gear rim is partially dismantled, and there are a few teeth, more than a dozen teeth, and a little indentation on the tooth surface. Generally, a new pair of gears need to run for a period of time due to manufacturing and assembly. The running condition is easy to see from the contact line. We noticed that the two gears meshed in very poor condition and could not see the running line. It was even worse. Gear accuracy. From the analysis of the reasons for partial tooth removal, the helical gear transmission is line contact, the load is uneven, the installation error or the shaft bending deformation is too large, etc. can cause the tooth removal. Uneven load is caused by low gear machining accuracy, gear 6 accuracy and many productions are not qualified. Both gears are rigid shafts with no bending. These two can be excluded. Therefore, you can only find the reason from the installation.
From the gear dismantling site, it is seen that the gear near the baseline is intact, there is no fatigue damage, and the bending strength is sufficient by the bending strength check. After eliminating all kinds of possibilities, we determined that the tooth removal was caused by excessive shock and vibration caused by abnormal factors in the transmission process. As for the pit-shaped indentation on the tooth surface, it is due to the indentation of the debris after the tooth removal, and the main reason is still the tooth removal. The reason for this disassembly is to study where the impact load comes from and how the uneven load is generated. We have found that the high and low speed shaft supports of the gearbox are all made of 7000 cylindrical thrust bearings. In addition, we noticed the thermal reasons. First look at the connection between the gearbox and the turbine is connected by a diaphragm coupling. Since the wear part of the piston body is directly above the piston, there is no influence on the axial balance. Therefore, only the deburring treatment is performed on the cylinder recessed portion, mainly to solve the deformation of the edge region due to the high temperature, so as to restore the axial balance of the piston body.
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