The large bearing of excavator traveling reducer, also called side reducer bearing or tooth box bearing, is mainly used in the traveling reducer of crawler excavator. The main categories are single row angular contact ball bearing, double row angular contact ball bearing and tapered roller bearing.

Excavator bearing applies railway bearing 03 04 2. Wheel axle bearing The wheel axle system of railway locomotive and vehicle adopts different structural design due to different application conditions. Locomotives and passenger cars have axle boxes. The bearings are connected to the bogie through axle boxes. Railway freight cars have no axle boxes. The bearings are connected to the bogie side frames through bearing saddles. The bearing bears the impact load generated between the wheel set and the bogie frame, as well as the axial load generated when the vehicle turns.

The wheel axle bearing structure comprises a cylindrical roller bearing, a cylindrical roller bearing unit, a tapered roller bearing, and a tapered roller bearing unit. According to the application requirements of railway bearings, wheel axle bearings shall have a long maintenance free period, a structural design that is convenient for maintenance and high reliability. Classification and application of wheel axle bearings Railway rolling stock wheel axle bearings can be divided into the following types according to the design technology and application of their vehicle types: cylindrical roller bearing unit double row tapered roller bearing unit single row tapered roller bearing single row cylindrical roller bearing unit cylindrical roller bearing unit, Generally, it is double row cylindrical roller bearing with sealing device on both sides or two paired single row cylindrical roller bearings with sealing device on one side. The bearing unit has been filled with grease before supply and installation, so it is unnecessary to add grease during installation. The bearing has a long maintenance cycle because of its integral sealing device. This type of bearing has a special structural design inside, and the modified linear contact between the roller and the raceway avoids the edge stress, which makes the bearing especially suitable for bearing high radial load in application, and also can bear part of the axial load. Compared with the tapered roller bearing unit, the cylindrical roller bearing unit is easy to disassemble and assemble, and convenient for the maintenance and repair of the bearing. Single row cylindrical roller bearing unit 3 matched with double row cylindrical roller bearing unit has complete seal. The bearing unit of double row tapered roller bearing unit has been filled with grease and the clearance has been adjusted before the supply and installation. The overall unit design is conducive to the installation and removal of the bearing. The bearing is pressed onto the journal through the cold press installation method.