What Is Thrust Bearing, Do You Understand

      Thrust bearings (thrust bearings) are generally composed of two thrust gaskets or more thrust gaskets and a number of rolling bodies, the general thrust gaskets are divided into shaft and seat pieces, and the most common type of rolling body is generally composed of iron or copper cages. Thrust bearings are divided into thrust ball bearings and thrust roller bearings. The planar thrust bearing mainly bears axial load in the assembly and is widely used.

1）Definition introduction

Thrust bearings are special bearings used to bear axial forces, that is, bearings with forces in the direction parallel to the axis.

Thrust bearings are also called thrust bearings.

2）Application classification

Thrust bearings are divided into thrust ball bearings and thrust roller bearings.

Thrust ball bearings are divided into thrust ball bearings and thrust angular contact ball bearings. A raceway ring matched with the shaft is called a raceway ring, and a raceway ring matched with the shell is called a seat ring. Two-way bearings match the middle ring with the shaft. One-way bearings can withstand one-way axial load, and two-way bearings can withstand two-way axial load. The bearing with spherical mounting surface of the seat ring has aligning performance, which can reduce the influence of installation error. This kind of bearing is mainly used in automobile steering mechanism, machine tool spindle.

Thrust roller bearings are divided into thrust cylindrical roller bearings, thrust aligning roller bearings, thrust tapered roller bearings, thrust needle roller bearings.

Thrust cylindrical roller bearings are mainly used in oil drilling RIGS, iron and steel machinery.

Thrust aligning roller bearings This kind of bearings are mainly used in hydraulic generators, vertical motors, propeller shafts for ships, tower cranes, extruders and so on.

Thrust tapered roller bearing The main uses of this type of bearing: one-way: crane hook, oil rig swivel. Double thrust bearing direction: roll neck.

The planar thrust bearing mainly bears axial load in the assembly and is widely used. Although the installation and operation of the thrust bearing is relatively simple, there are still mistakes in the actual maintenance, that is, the installation position of the tight and loose rings of the bearing is incorrect, which causes the bearing to lose its function and the journal to be worn quickly. The tight ring is installed on the end face of the stationary part, that is, the wrong assembly. The inner ring of the tight ring is a transitional fit with the journal. When the shaft rotates, the tight ring is driven and friction occurs with the end face of the stationary part. When the axial force (Fx) is applied, the friction torque will be greater than the resistance moment of the inner diameter, resulting in forced rotation of the tight ring and the mating surface of the shaft, aggravating the wear of the journal.

3）operating principle

      Thrust ball bearing is a separate type of bearing, the shaft ring, the seat ring can be separated from the cage, the steel ball components. The shaft ring is a ring matched with the shaft, and the seat ring is a ring matched with the bearing seat hole, and there is a gap between the shaft; Thrust ball bearings can only withstand the axial load, one-way thrust ball bearings can only withstand the axial load in one direction, two-way thrust ball bearings can withstand the axial load in two directions; Thrust ball bearings can not limit the radial displacement of the shaft, the limit speed is very low, one-way thrust ball bearings can limit the axial displacement of the shaft and the housing in one direction, and two-way bearings can limit the axial displacement in two directions.

       Thrust roller bearings are used to bear axial and radial combined loads based on axial loads, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction factor, higher speed and aligning performance. The stick of type 29000 bearing is an asymmetric spherical roller, which can reduce the relative sliding of the roller and the raceway in the work, and the roller is long, large in diameter, the number of rollers is large, and the load capacity is high. It is usually lubricated by oil, and the grease can be lubricated in individual low speed cases. In the design selection, should be preferred; 80000 type thrust cylindrical roller bearings, 90000 type thrust tapered roller bearings and AXK type thrust needle roller bearings can withstand one-way axial load, which is much larger than the axial load capacity of thrust ball bearings, and large rigidity, occupying less axial space. Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for low speed occasions, the thrust tapered roller bearing speed is slightly higher than the thrust cylindrical roller bearing.