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Structural Features of Insert Bearings (External Spherical Ball Bearings).jpg
Structural Features of Insert Bearings (External Spherical Ball Bearings).jpg

High-Quality Self-Aligning Precision Insert Bearings from China Factory - Trusted Suppliers for Your Needs

Insert bearings are essential components that include an external spherical ball bearing and a precision-engineered bearing housing. Designed to accommodate misalignment effortlessly, the spherical mating surface between the bearing and the housing ensures smooth operation and extended lifespan. As a leading manufacturer in China, our factory specializes in producing high-quality insert bearings. We are committed to supplying top-notch products to our global clientele. Trust our expertise as reliable suppliers to meet all your bearing needs
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    Product Details

    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)
    Used for rotating bearing applications above 10 rpm.
    Radial Basic Static Load Rating (Cₒᵣ)
    Used for stationary or slow-rotating applications.

    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
    ⚠️ Important: Failures unrelated to fatigue life — such as seizing, fracture, cracks, brinelling, or seal failure — are considered bearing faults. These stem from improper selection, mechanical design flaws, installation errors, misuse, or manufacturing defects, and should be clearly distinguished from natural service life.
    Frequently Asked Questions (FAQ)
    Q What are the main types of insert bearings based on shaft clamping methods?
    Insert bearings are classified into four main types based on the shaft clamping method: Set Screw Type, Eccentric Collar Type, Tapered Bore with Adapter Sleeve Type, and Locking Collar Type. Each type suits different installation requirements and load conditions.
    Q What is the difference between cast iron and stamped steel bearing housings?
    Cast iron housings offer a rigid, monolithic structure that provides excellent stability and is ideal for heavy-duty applications. Stamped steel housings are lighter and more cost-effective, making them suitable for lighter loads and environments where weight reduction is a priority.
    Q Why is the radial clearance of insert bearings larger than that of standard deep groove ball bearings?
    Insert bearings are designed with a larger radial clearance to accommodate shaft misalignment and thermal expansion during operation. This extra clearance allows the self-aligning spherical outer surface to compensate for shaft deflection or installation errors without causing excessive stress on the bearing.
    Q How do I choose the right insert bearing based on load requirements?
    Bearing selection is based on the basic load rating. For rotating applications (n > 10 rpm), use the Basic Dynamic Load Rating (C). For stationary, slow-rotating, or oscillating applications (n ≤ 10 rpm), refer to the Basic Static Load Rating (Cₒ). Both values are listed in the product dimension tables and should be matched against your application's actual load requirements and desired service life.
    Q What causes insert bearing failure, and how can it be prevented?
    Bearing failure can result from fatigue spalling (natural service life), as well as premature faults such as seizing, fracture, brinelling, or seal failure. Premature failures are typically caused by improper bearing selection, poor installation, misuse, or inadequate lubrication. To prevent failure, ensure correct bearing selection, proper installation alignment, regular lubrication, and appropriate load management.
    Q What are the different types of bearing service life, and why do they matter?
    Bearing service life is categorized into three types based on failure mode: Noise Life (when noise or vibration exceeds acceptable levels), Wear Life (when precision is lost due to surface wear), and Lubricant Life (when the lubricant degrades and can no longer protect the bearing). Understanding these distinctions helps engineers select the right bearing and maintenance schedule for their specific application.