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Self-Aligning Roller Bearing.jpg
Self-Aligning Roller Bearing.jpg

Powerful Spherical Roller Bearings from China Suppliers and Factory for Enhanced Performance and Reliability

Spherical roller bearings, produced by top manufacturers in China, are essential components in various industrial applications. These bearings consist of an inner ring with two rows of raceways and an outer ring featuring a spherical raceway, designed to house barrel-shaped rolling elements. The unique alignment of the outer ring raceway with the bearing center enhances performance and reliability. The inclined angle of the inner ring raceways allows for effective self-alignment, providing resistance to misalignment due to inaccuracies in the shaft or housing, as well as shaft deflection. Apart from effectively bearing radial loads, these high-quality products can also manage certain bidirectional axial loads, making them ideal for use in environments subject to vibration and impact. As a leading factory in the bearing industry, we guarantee superior quality and durability, meeting the diverse needs of our customers around the globe
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    Product Details

    Product Introduction

    🔩

    Spherical roller bearings incorporate a large number of long, symmetrical, and large-diameter rollers, allowing them to withstand heavy concentrated loads. The unique raceway geometry and optimal surface finish of Type C and CA bearings minimize friction. Compared to traditional spherical roller bearings, these designs operate at lower temperatures, support heavier axial loads, and achieve higher speeds.

    HRB spherical roller bearings are available with cylindrical or tapered bores.

    • Series 240 and 241: tapered bore with a taper of 1:30 (suffix code K30)
    • Other bearings: tapered bore with a taper of 1:12 (suffix code K)

    Design

    ⚙️ Type C and EC Designs Stamped Steel Cage

    These bearings feature symmetrical rollers and a stamped steel cage. The guide ring is centered on the inner ring.

    • Type EC: Incorporates reinforced rollers for increased load capacity.
    • Type C: Employs optimized surface finishing on rollers and raceways to improve roller guidance and reduce friction.
    ⚙️ Type CA and ECA Designs Machined Brass / Steel Cage

    These bearings feature symmetrical rollers and flanges on the inner ring. The guide ring is positioned between the two rows of rollers and centered on the inner ring. The cage is a one-piece machined brass or steel design.

    • Type CA: Utilizes the same surface finishing as Type C bearings.
    • Type ECA: Incorporates reinforced rollers for enhanced load capacity.

    Oil Grooves and Holes

    🛢️

    For effective lubrication, standard HRB spherical roller bearings include annular oil grooves and three oil holes on the outer ring, except for:

    • Type C bearings with an outer diameter below 150 mm or 180 mm (varies by series)
    • All series 213 bearings
    💡 The suffix code W33 denotes bearings (Types C, EC, CA, and ECA) with oil grooves and holes on the outer ring.

    Angular Misalignment

    📐

    The design of spherical roller bearings enables self-alignment, allowing them to compensate for angular misalignment between the inner and outer rings. Under normal load and operating conditions, the permissible misalignment values during inner ring rotation are provided in the reference table.

    Tolerances

    📏

    Spherical roller bearings with cylindrical or tapered bores are manufactured with standard (normal) tolerances, as listed in Table 9.4.

    Internal Clearance

    Standard spherical roller bearings are supplied with normal radial internal clearance. However, most applications require bearings with C3 clearance, and some even require larger C4 clearance. Certain sizes are available with C2 clearance (smaller than normal).

    📋 The limits for various clearance grades are listed in Tables 5.25 and 5.26 (Pages 67–68) and comply with ISO 5753:1981.

    These values apply to unloaded bearings in an unmounted state.

    Effect of Operating Temperature on Bearing Materials

    🌡️

    Standard spherical roller bearings undergo special heat treatment, ensuring no significant dimensional changes occur at operating temperatures exceeding +200°C.

    Minimum Load

    To ensure satisfactory operation, bearings must be subjected to a minimum load. Without sufficient load, inertial forces of the rollers and cage, along with lubricant friction, may adversely affect rolling behavior at high speeds, potentially causing destructive sliding between rollers and raceways.

    The minimum required radial load can be estimated using the formula:

    Minimum Radial Load Formula
    Frm = 0.02 × Cr
    • Frm — Minimum radial load (N)
    • Cr — Basic dynamic load rating (N)
    ⚠️ The weight of supported components combined with external forces often exceeds the minimum load requirement. If not, supplemental radial loads (e.g., increased belt tension or idle torque) must be applied.

    Dynamic Equivalent Bearing Load

    When Fa / Fr ≤ e :
    P = Fr + Y1 · Fa
    When Fa / Fr > e :
    P = 0.67 · Fr + Y2 · Fa
    📋 The calculation coefficients e, Y1, and Y2 for each bearing are provided in the bearing tables.

    Static Equivalent Bearing Load

    Static Equivalent Load Formula
    P0 = Fr + Y0 · Fa
    📋 The calculation coefficient Y0 for each bearing is provided in the bearing tables.
    ❓
    Frequently Asked Questions
    Q What is the difference between Type C and Type CA spherical roller bearings?
    Type C bearings use a stamped steel cage with the guide ring centered on the inner ring, while Type CA bearings feature flanges on the inner ring and a one-piece machined brass or steel cage with the guide ring positioned between the two rows of rollers. Both types use the same optimized surface finishing on rollers and raceways to reduce friction.
    Q What do the suffix codes K and K30 indicate on HRB spherical roller bearings?
    The suffix code K indicates a tapered bore with a taper ratio of 1:12, used on most standard series. The suffix code K30 indicates a tapered bore with a taper ratio of 1:30, specifically used on series 240 and 241 bearings.
    Q What does the suffix W33 mean on a spherical roller bearing?
    The suffix W33 denotes that the bearing (Types C, EC, CA, or ECA) is equipped with annular oil grooves and three oil holes on the outer ring, designed for improved lubrication in demanding applications.
    Q Why is internal clearance important, and which clearance grade is most commonly used?
    Internal clearance affects the bearing's load distribution, noise level, and operating temperature. While standard bearings ship with normal clearance, C3 clearance (greater than normal) is the most commonly specified for typical industrial applications to accommodate thermal expansion during operation. C4 clearance is used where even greater expansion is expected.
    Q How is the minimum radial load for a spherical roller bearing calculated?
    The minimum radial load is estimated using the formula Frm = 0.02 × Cr, where Cr is the basic dynamic load rating of the bearing. If the weight of supported components and external forces do not meet this minimum, additional radial load must be applied through methods such as increased belt tension or idle torque.
    Q Can HRB spherical roller bearings operate at temperatures above 200°C?
    Standard HRB spherical roller bearings undergo special heat treatment that ensures no significant dimensional changes occur at operating temperatures exceeding +200°C. This makes them suitable for high-temperature industrial environments, though lubrication selection and seal compatibility should also be verified for such conditions.