Farm vehicles, automotive lubricants in the work interruption axle phenomenon is not uncommon, once broken axle failure occurred farm vehicles, not only affects the owner benefits, but will also cause the car to turn people injured in the accident, it should cause machine hand attention.

Axle fatigue fracture are mostly broken. Farm vehicles at work, axle to withstand torque and bending moments. In alternating stress long-term surface of the shaft is easy to produce fatigue cracks, and over time, expand and deepen. When the instantaneous load shaft exceeds the ultimate strength of the shaft, axle fracture occurs. Axle fracture with the following factors.

1. Material defects. Such as shrinkage, porosity, heat treatment process is unreasonable, these defects reduce the cross-sectional area of ??the shaft, reducing the strength of the shaft.

2. poorly designed. Such as small diameter, corrosion resistant matte transition shoulder at the pump is too small fillet. The former is strong enough, the latter have a greater stress concentration at the shoulder.

3. improper processing. Such as turning, surface grinding parts after rough, likely to cause stress concentration.

4. Axle taper does not meet the requirements. If the axle and wheel hub taper taper does not match, it will cause the wheels on the axle or wheel wobble fixed is not strong, easily broken axle.

5. Use and improper maintenance. Farm vehicles on uneven pavement overload at high speed, long-term care and cause bearing oil, washers failure, all of which result in the deterioration of working conditions axle, causing the axle fracture failure.