Railway Bearings – Characteristics And Applications Of Axle Gearbox Bearings

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Tapered roller bearings are separable, and their inner ring roller cage assembly and outer ring can be separated and assembled separately. Corrected linear contact between rolling elements and raceways avoids edge stresses. Tapered roller bearings can support both high radial and axial loads. Because this type of bearing can only bear axial force on one side, it needs to be paired when used. This type of bearing is used in gear boxes and axle holding boxes.

The main application properties of gearbox bearings are:

1. High speed;

2. High load capacity;

3. Resistant to vibration and impact;

4. High temperature resistance.

The selection of bearings is determined based on the size of the relevant structural domain of the gearbox. Taking into account the above application factors, the calculated life is generally required to be greater than 2 million kilometers.

Axle gearbox bearing applications

1. Tapered roller bearings

Tapered roller bearings are separable, and their inner ring roller cage assembly and outer ring can be separated and assembled separately. Corrected linear contact between rolling elements and raceways avoids edge stresses. Tapered roller bearings can support both high radial and axial loads. Because this type of bearing can only bear axial force on one side, it needs to be paired when used. This type of bearing is used in gear boxes and axle holding boxes.

2. Four-point contact bearing

Four-point contact ball bearing is a kind of angular contact ball bearing. It can bear axial load in both directions at the same time. It is usually paired with a cylindrical roller bearing to bear radial force, and adopts clearance fit in the radial direction. The split structure of the inner ring allows it to assemble more steel balls. This type of bearing is used in gearboxes.

3. Cylindrical roller bearings

Single row cylindrical roller bearings have an inner ring that can be separated from an assembly consisting of outer ring, roller and cage, which is extremely beneficial for the installation, disassembly, maintenance and inspection of the bearing. Therefore, it is more suitable for railway bearings than other bearings. widely. Cylindrical roller bearings can withstand high radial forces. The modified linear contact between rolling elements and raceways eliminates edge stress and improves the reliability of bearing applications. NJ and NUP type cylindrical roller bearing combinations can withstand a certain axial force. This type of bearing is used in traction motors, gearboxes, and wheel-set hollow shaft drives.

4. Insulated bearings

Under certain bad or special working conditions, shaft bearings and motor bearings may be damaged due to extra voltage. Although the manufacturing process of the motor is perfect, it cannot completely avoid the potential difference between the rotor and the stator due to electromagnetic asymmetry, so the current passes through the bearing to form a closed circuit. In order to avoid the above situation, Wazhou Group’s solution is to use an oxide ceramic coating on the outer ring surface of the bearing to block a voltage of no less than 1000V and protect the bearing from failure due to electrical corrosion caused by additional voltage.