Self Aligning PrecisionInsert Bearings
Product Introduction
● Based on the clamping method with the shaft, bearings are typically classified into four types:
· Set screw type
· Eccentric collar type
· Tapered bore with adapter sleeve type
· Locking collar type
● Bearing housings are categorized by material:
· Cast iron housings
· Stamped steel housings
● Insert bearings are designed with various sealing devices. Different sealing structures can be selected based on working conditions to ensure reliability and extended service life.
Structure of Set Screw Type Insert Bearing with Pillow Block Housing
● Cast Iron Housing: Rigid monolithic structure for easy installation.
● Wide Inner Ring: Facilitates secure locking with set screws and enhances rigidity.
● Set Screws: Two set screws positioned at 120° angles on the inner ring ensure firm attachment to the shaft.
● Retainer Rings: One on each side to effectively block dust ingress.
● Contact Rubber Seals: Installed inside the retainer rings on both sides to ensure effective lubrication of rolling elements and raceways.
● Grease Fitting: Allows injection of fresh lubricant.
● Self-Aligning Spherical Surface: Automatically compensates for inevitable shaft deformation or installation misalignment.
Radial Clearance
The radial clearance of insert bearings is generally larger than that of deep groove ball bearings.
How to Select Insert Bearings?
Bearing size selection is primarily based on load capacity, service life requirements, and reliability. The basic load rating is a key technical indicator for evaluating bearing load capacity, including:
● Basic dynamic load rating (for rotational conditions, n > 10 rpm)
● Basic static load rating (for stationary, slow-rotation, or oscillating applications, n ≤ 10 rpm)
As radial ball bearings, insert bearings primarily withstand radial forces. Thus, their load ratings are expressed as:
● Radial basic dynamic load rating (Cₒ)
● Radial basic static load rating (Cₒᵣ)
These values are provided in the product dimension tables.
Service Life Considerations
Life calculation is a critical basis for selecting rolling bearings. ""Life"" typically refers to fatigue life. Under proper operating conditions (moderate loads, correct installation, adequate lubrication), bearing failure is mainly caused by fatigue spalling of rolling contact surfaces due to alternating stress—a phenomenon that cannot be entirely avoided.
However, different machinery applications have varying requirements. Bearings must maintain specific performance within a defined period. After prolonged operation, increased noise/vibration, wear-induced precision loss, or lubricant degradation may lead to failure. Lifespans categorized by failure mode include:
● Noise life
● Wear life
● Lubricant life
Failures unrelated to fatigue life (e.g., seizing, fracture, cracks, brinelling, seal failure) are considered bearing faults. These stem from improper selection, mechanical design flaws, installation errors, misuse, or manufacturing defects, and should be distinguished from natural(service life)."