Typically, the two double row tapered roller bearing radial and axial support, as well as the side of the bearing is called a fixed end bearings, which bear both radial and axial load fixed shaft type and relative bearing box the axial displacement. The other is known as a free end, only radial loads, axial relative movement can be. Fixed end double row tapered roller bearings must be compared with the fixed shaft and housing, more suitable bearings can support, but the installation must maintain a certain interval radial bearing housing. Due to changes in the axial length of the free end of the heat koyo bearing expansion, double row tapered roller bearings squeeze not happen. Axial displacement occurs in the bearing rings, it may also occur with bearings in the bearing.

koyo bearing on the fundamental properties of the material requirements depend on the operating characteristics of the double row tapered roller bearings. Generally, bearing steel should have the following properties:

1. The high contact fatigue strength.

2. The high wear resistance.

3. The high elastic limit and yield strength.

4. The high and uniform hardness.

5. certain impact toughness.

6. good dimensional stability.

7. The good corrosion performance.

8. A good process performance.

For under special conditions of the double row tapered roller bearing materials, according to their specific requirements it should also have its special properties adapted to the conditions, such as: high temperature, low temperature resistance, corrosion resistance, anti-radiation, magnetic and other characteristics.