The main cause of the broken bevel gear

During operation, the abnormal noise of the overload operation occurs inside the reducer, and the transmission is extremely unstable. The radial runout of the gear shaft is about 1.55mm. The curved toothed pinion and the bevel gear have a high breaking frequency. From the use situation, the average 6 to 10 months breaks, resulting in many times of equipment shutdown and maintenance, and each maintenance time is long, which brings a lot of difficulty to the production coordination organization, and sometimes even leads to the whole system paralyzed.
Curved bevel gears have a short service life and a large consumption of spare parts. Because each set of curved toothed pinion and bevel gear must be used together, when any one of them is damaged and replaced, it must be replaced in a complete set. As a result, the gear consumption is large and the spare parts cost is high. The analysis of the cause of the broken bevel gear breaks causes many reasons for the curve bevel gear to break, such as: sudden break by short-time overload; fatigue fracture caused by large and high-frequency impact load or root fatigue caused by repeated bending Manufacturing and installation are inaccurate, resulting in load concentration and breakage.
After several years of installation and use of the curved bevel gear and observation of the tooth surface after breaking, the main reasons for the fracture of the curved bevel gear are as follows: the installation error of the curved toothed pinion and the bevel gear is large. The performance is as follows: 1 The curved toothed cone has a high contact area and the bevel gear contact area is low. Due to the curvature relationship of the tooth length direction of the Shandong vacuum pump, the concave side of the curved toothed pinion is slightly larger than the big end, the convex side is slightly smaller than the small end, and the bevel gear is just the opposite. 2 The curved toothed pinion and the teeth on both sides of the gear are in contact with the small end, because the angle of intersection of the two axes is too large. 3 Curved bevel pinion and gear are in contact with the big end on one side of the tooth and the small end on the other side due to the offset of the two axes. The above three phenomena are mainly caused by the large axial and radial error of the two gears and the failure of the two axial lines to ensure that they are perpendicular to each other, which is the main cause of gear breakage.

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