Cylindrical roller bearings, known for their robust design and high load-carrying capacity, are a crucial component in various mechanical systems. This type of bearing is characterized by its cylindrical rollers that are arranged parallel to each other and roll along the raceways of the inner and outer rings. This article provides a comprehensive overview of cylindrical roller bearings, including brand introductions, product types, detailed descriptions, characteristics, structure, working principles, classifications, popular brands, applications, and maintenance.

Brand Introduction

One of the leading manufacturers of cylindrical roller bearings is SKF, a Swedish company renowned for its excellence in bearing technology. SKF's CARB (Cylindrical Roller Bearings, Adjusted, for Radial Loads and Axial Displacement) ring roller bearings are particularly notable for their unique design and superior performance. These bearings are widely used in engineering machinery, wind power generation, shipbuilding, and other industries.

Product Types and Overview

Cylindrical roller bearings are typically identified by a four-digit code starting with NR or N (e.g., NR202, NR203). The first letter indicates the type (R for cylindrical roller bearing, N for outer ring without rib). The second and third digits represent the bore diameter series, while the fourth digit signifies the diameter series. For example, in NR202, '2' represents a bore diameter series of 2mm, and '02' indicates a diameter series of 0.2mm.

Product Characteristics

Cylindrical roller bearings are known for their line contact between the rollers and raceways, providing high radial load capacity. They are suitable for heavy loads and shock loads, with low friction coefficients making them ideal for high-speed applications. The separation of the inner and outer rings allows for axial displacement, making them adaptable to changes due to thermal expansion or installation errors.

Product Structure

The internal structure of cylindrical roller bearings features rollers arranged in parallel, with spacers or separators between them to prevent tilting or friction. This design minimizes rotational torque and enhances performance. The bearings can be classified into single-row and double-row types based on the number of roller rows. Single-row bearings can be further categorized as NU, NJ, NUP, N, and NF types, while double-row bearings include NNU and NN types.

Working Principle

The working principle of cylindrical roller bearings involves the rollers rolling along the raceways of the inner and outer rings. The line contact between the rollers and raceways distributes the load evenly, resulting in high load capacity. The low friction coefficient allows for smooth and efficient rotation, suitable for high-speed applications.

Single row cylindrical roller bearings are designed to accommodate high radial loads in combination with high speeds. Having two integral flanges on the outer ring and one on the inner ring, NJ design bearings can accommodate axial displacement in one direction. An important feature is the separable design, which ease of assembly and fitting and axial location.

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