Cylindrical Bore Self-aligning Roller Bearing

I. Product Overview

Spherical roller bearings with cylindrical bore are a type of double-row roller bearing featuring high load-carrying capacity and strong adaptability. Their core characteristics include a cylindrical inner bore structure and spherical roller design, with the English name being "Spherical Roller Bearings with Cylindrical Bore" (abbreviated as SRB-CB in some contexts). Through the sophisticated coordination between the spherical raceway of the outer ring and the double-row convex rollers, this product achieves self-aligning functionality. It can effectively compensate for concentricity errors caused by misalignment in shaft-housing installation or shaft deflection due to deformation. Meanwhile, it possesses excellent shock and vibration resistance, making it a key fundamental component for handling complex working conditions in heavy industry.

II. Core Structure and Design Features

1. Precision Structural Composition

The product consists of five core components that work together to ensure the optimal realization of load-carrying and self-aligning performance:

Inner Ring: Adopts a standard cylindrical inner bore, enabling interference or transition fit with the shaft. It is equipped with two concave raceways inclined at a specific angle relative to the bearing axis, providing a precise movement path for the rollers.

Outer Ring: Features a concave spherical raceway, whose center of curvature completely coincides with the bearing center-this serves as the core structural foundation for achieving self-aligning functionality.

Double-Row Spherical Rollers: Designed with a convex (barrel-shaped) profile (thicker in the middle and thinner at both ends), these rollers perfectly fit the spherical raceway of the outer ring. This design effectively avoids edge stress concentration and improves the uniformity of load distribution.

Cage: Classified into two types based on bearing models:

Type C uses a stamped steel cage, which offers advantages such as low friction loss and high limiting speed.

Type CA adopts a solid integral cage with double claws, made of copper or carbon steel, and is widely used in large and extra-large bearings.

Lubrication and Sealing Accessories: Some models (with the suffix "/W33" in the designation) are provided with an annular oil groove and three evenly distributed oil holes on the outer ring to optimize lubrication. Dust covers and other sealing components can be configured as required to reduce the intrusion of contaminants.

2. Key Design Characteristics

Superior Self-Aligning Capacity: The allowable self-aligning angle ranges from 1° to 2.5°, enabling it to easily handle issues such as misalignment between the shaft and bearing housing during installation, and shaft bending under load, thus ensuring stable equipment operation.

Composite Load-Carrying Capacity: In addition to withstanding heavy radial loads, it can also bear bidirectional axial loads and combined loads. Its rated load capacity is far higher than that of ordinary cylindrical roller bearings.

Excellent Shock Resistance: Through design optimizations such as increasing roller length and improving raceway surface quality, the bearing's resistance to vibration and shock loads is significantly enhanced, making it suitable for harsh working conditions.

Strong Temperature Adaptability: After undergoing a special heat treatment process, it will not experience dimensional changes beyond the allowable range even when operating at temperatures above +200°C.

III. Main Product Models and Classification

Based on inner ring structure, cage type, and additional functions, mainstream products can be categorized into the following series:

Note: For installation on tapered shaft journals or plain shafts, tapered bore models (with suffix "K/K30") or combined models with adapter sleeves (e.g., 20000 CCK+H0000 Series) can be selected.

IV. Performance Parameters (General Reference)

Load-Carrying Capacity: The basic dynamic load rating covers a wide range depending on the model. EC/ECA enhanced types further improve load capacity by adopting reinforced rollers.

Minimum Radial Load: It is required to meet Fr = 0.02C (where Fr is the minimum radial load and C is the basic dynamic load rating) to avoid destructive sliding between rollers and raceways during high-speed operation.

Internal Clearance: Standard products provide normal-class clearance. Customized clearance grades such as C2 (small clearance), C3 (medium-upper clearance), and C4 (large clearance) are available upon request, complying with the ISO 5753-1981 standard.

Tolerance Class: Conventional products feature normal-class tolerance, which can meet the installation accuracy requirements of most industrial equipment.

V. Applicable Industries and Typical Applications

With its comprehensive performance advantages, the product is widely used in various heavy industry fields:

Steel Industry: Key equipment such as gearbox housings for rolling mills, roller tables of rolling mills, and continuous casting machines.

Mining Machinery: Equipment subject to large shock loads, including crushers, ball mills, and vibrating screens.

Energy and Power Industry: Transmission systems of coal mills and generator sets.

Paper and Printing Industry: Press rolls of paper machines and main drive shafts of printing machines.

Other Fields: Marine propulsion systems, textile machinery, industrial reducers of various types, and axles of railway vehicles.

VI. Installation and Maintenance Guidelines

Installation Specifications: Spherical roller bearings with cylindrical bore are typically fitted to the shaft using press-fitting or heat-fitting methods. During installation, the shaft journal surface must be kept clean to prevent impurities from affecting the fitting accuracy.

Lubrication Requirements: Select an appropriate lubricant based on working conditions. Models with the "/W33" suffix require regular lubricant replenishment through oil holes to ensure a stable oil film is formed between the raceways and rollers.

Clearance Adjustment: When used with adapter sleeves, the radial clearance can be adjusted by axially moving the inner ring to meet the requirements of different working conditions.

Maintenance Inspection: Regularly monitor the bearing temperature, vibration values, and lubricant condition. Timely maintenance and repair when abnormalities are detected can significantly extend the service life.

VII. Summary of Product Advantages

Wide Adaptability to Working Conditions: It can operate stably from ordinary machinery to heavy-duty equipment, and from normal-temperature environments to high-temperature working conditions.

High Operational Reliability: The dual guarantees of self-aligning functionality and shock-resistant design greatly reduce the probability of equipment failure and downtime.

Long Service Life: Optimized internal structure and material selection, combined with standardized maintenance, result in a service life far exceeding that of similar ordinary bearings.

Low Comprehensive Cost: It reduces maintenance costs caused by installation misalignment and shock loads, lowering the overall operation and maintenance expenses of equipment.

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