Rotary disk bearings for excavators are the most important joints of excavators. There are two main reasons for the early failure of rotary disk bearings for excavators, one is broken teeth, the other is the destruction of raceway. Among them, broken teeth are the main reason, accounting for more than 90%, and most of them occur within six months after the excavator leaves the factory. The broken teeth cause the failure of the rotary bearing of the excavator. Tooth breakage does not usually occur in the early normal use of rotary disk bearings, but we have to face the fact that the working conditions of excavators are worse than those of main machines in tower cranes, truck cranes and other industries where bearings are used, with faster rotation speed and greater impact load, and the possibility of tooth breakage corresponds. It's bigger, too.
The rule of early broken teeth of excavator rotary bearing is analyzed by data analysis. It is found that most of the broken teeth occur in the upper half along the direction of tooth width. More than half of the broken teeth intersect with the upper end of the gear teeth, and form an angle of 45 to 60 degrees, even if the whole teeth fall off, their cracks are also from the top. And the downward expansion. The plastic deformation of the gear caused by extrusion is also quite obvious, and the upper part is much more serious than the lower part. The width of the whole ring alveolar varies in varying degrees, and increases from bottom to top, from root to top alveolar width.