Double Row Cylindrical Roller Bearings

Introduction

Double row cylindrical roller bearings belong to one kind of cylindrical roller bearings, which have the advantages of compact structure, high rigidity, large load carrying capacity, small deformation after load, etc. They are especially suitable for machine tool spindle support. According to the different structure of the loaded rolling elements, double row cylindrical roller bearings can be divided into various types, such as NN type, NNF type, etc., and each type has its own specific application scenarios and advantages. For example, NNF type bearings can withstand large radial and axial loads, as well as tilting moments, so they are often used as fixed end bearings.

Key Features:

• Double Row Design: Two rows of cylindrical rollers in a single bearing provide a larger contact area, which increases load capacity and stiffness.
• Axial Load Capacity: In addition to high radial load capacity, double row cylindrical roller bearings can also handle axial loads in both directions, making them suitable for combined load applications.
• High Rigidity: The dual-row structure results in higher rigidity, making these bearings ideal for high-precision and high-stiffness applications.
• Low Friction and Low Temperature Rise: Greatly reduced friction helps to reduce heat generation, which allows the bearings to be adapted to equipment in high-speed applications.

Partial Product Parameter Table

Applications

Double row cylindrical roller bearings play a significant role in many heavy machinery fields such as machine tools, metallurgy, mining, petroleum, chemical industry and cement. The significant performance characteristics of this bearing include excellent heavy load bearing capacity, so that it can easily meet the challenges of heavy machinery; at the same time, it can also effectively withstand the radial and axial composite load, to ensure the smooth and reliable operation of the equipment. In addition, double row cylindrical roller bearings show strong speed adaptability, whether low speed or high speed operation, can maintain excellent performance. Its high-precision design enhances the stability and accuracy of the work, providing a solid guarantee for various industrial applications. In summary, double row cylindrical roller bearings have been widely used and recognised in many industrial fields due to their excellent performance characteristics.

applications, double row cylindrical roller bearings offer a combination of strength, reliability, and long service life.

FAQ

1. Can double row cylindrical roller bearings be disassembled and mounted?

Double Row Cylindrical Roller Bearings can be disassembled, but they cannot be used after disassembly. The inner and outer rings of these bearings are of separable construction, but in normal use they need to fit tightly to support the rotating parts.

2. What are the common types of double row cylindrical roller bearings?

Double Row Cylindrical Roller Bearings can be categorised into NNU, NN and other models depending on whether the collar has a stall edge or not. These bearings are suitable for bearing heavy loads and shock loads, and are also suitable for high-speed rotating occasions.

 3. How to install double row cylindrical roller bearings correctly?

The mounting of double row cylindrical roller bearings can be done by press pressing in or hot mounting. When using a press to press in, make sure that the inner ring of the bearing is in close contact with the shoulder of the shaft to avoid causing indentation or crush on the raceway. For large bearings, the hot-fitting method is more suitable, i.e. the bearing is heated and expanded in oil and then fitted to the shaft to avoid adding undue force to the bearing.

4. Double row cylindrical roller bearings in the use of the process of what failure may occur?

Possible failures of double row cylindrical roller bearings during use include breakage of the inner or outer rings. These failures can be caused by excessive loads during mounting, large shocks or repeated shock loads. In addition, poor lubrication conditions of the bearing may also lead to failures.