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1Analysis and selection of working conditions of tapered roller bearings
(1) Analysis of working conditions
Bearings are widely used in various mechanical equipments and vehicles such as diesel engines, tractors, machine tools, automobiles and trains. They consist of four parts: the inner ring, the outer ring, the rolling elements and the cage. The inner ring is tightly mounted on the spindle and rotates with the shaft. The outer ring is mounted in the bearing housing and is stationary. During the rotation of the shaft, the inner ring and the rolling element rotate and roll, serve under high-speed motion, and withstand cyclic high-pressure alternating loads and stresses of point or line contact. The role is therefore easy to cause local stress concentration. The rolling body and the inner and outer rings are both rolling and sliding, so rolling friction and sliding friction are generated. Therefore, the above process can be analyzed. The damage form of the rolling bearing is contact fatigue damage and wear, and the rolling element and the inner and outer rings should be required. High fatigue resistance and wear resistance, good dimensional stability, to ensure high bearing life.
2Failure analysis of tapered roller bearings
In general, the main failure modes of rolling bearings are fatigue spalling under alternating stress and loss of bearing accuracy due to frictional wear. In addition, there are cracks, indentations, rust and other causes of abnormal damage to the bearing.
(1) contact fatigue failure;
(2) wear failure;
(3) fracture failure;
(4) plastic deformation failure;
(5) clearance change failure.
3Performance requirements Tapered roller bearings shall have the following properties after heat treatment of materials:
(1) high contact fatigue strength;
(2) high wear resistance;
(3) high elastic limit;
(4) suitable hardness;
(5) a certain impact toughness;
(6) Good dimensional stability.