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Tapered Roller Bearings.jpg
Tapered Roller Bearings.jpg

Tapered Roller Bearings from China - Reliable Suppliers and Quality Factory Products for Optimal Performance

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Tapered roller bearings from China are designed with precision, featuring inner and outer raceways whose generating lines and the extended centerline of the rollers all converge at a single point along the bearing axis. This innovative configuration promotes pure rolling motion of the rollers on the raceways, enhancing overall performance.

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As reliable components for various applications, tapered roller bearings effectively accommodate radial loads, unidirectional axial loads, and their combinations. The ability to handle increased axial load capacity is enhanced by the contact angle. Notably, even under pure radial loads, an axial component force will manifest, which is why these bearings are often utilized in pairs. Trustworthy suppliers and factories in China provide high-quality tapered roller bearings to meet diverse engineering needs.

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    Product Details

    Main Structural Types

    Tapered roller bearings are classified into three types:

    • Single-row
    • Double-row
    • Four-row

    The main parameters of tapered roller bearings have been optimized, increasing the number of rollers and their effective length. The meticulous design of the rollers and raceways significantly improves geometric contact, stress distribution, and lubricant film formation, enhancing roller motion conditions. Consequently, compared to earlier models of the same size, these bearings offer higher load capacity and extended rated service life.

    Double-Row Capability

    Double-row tapered roller bearings can withstand combined radial and axial loads (primarily radial) as well as bidirectional axial loads. A spacer is placed between the two inner rings, allowing clearance adjustment and uniform load distribution by varying the spacer thickness. These bearings are suitable for medium to low-speed applications.

    Dimensions

    Single-row tapered roller bearings are available in both metric and inch series, both widely used.

    • Metric series bearings conform to ISO 355:1977
    • Bearings with prefix F-J comply with AFBMA Standard 19.1
    • Inch series tapered roller bearings comply with AFBMA Standard 19 (1974)

    Permitted Misalignment

    Important Notice

    The maximum allowable misalignment between the inner and outer rings of single-row tapered roller bearings is 3 arcminutes. Therefore, during installation, strict concentricity between the bearing bore and the housing bore must be ensured. Otherwise, bearing service life may be compromised.

    Tolerances

    For tapered roller bearings of the same designation, the inner rings (with roller and cage assemblies) or outer rings are interchangeable. After swapping inner or outer components, the total bearing width T must remain within tolerance limits.

    Metric Bearings

    Standard metric tapered roller bearings are manufactured with normal tolerance. Products with tolerance classes P6X, P6, P5, P4, and P2 are also available. Bearings with P5 tolerance or higher are primarily used for machine tool spindles. Chamfer dimension tolerances comply with ISO 582:1979. F-J series bearings are generally produced to P6X tolerance, with chamfer dimensions adhering to inch series bearing chamfer tolerances.

    Inch Bearings

    Standard inch series tapered roller bearings are manufactured with normal tolerance. Products with tolerance classes CL2, CL3, CL0, and CL00 are available upon request.

    Internal Clearance

    Internal clearance in single-row tapered roller bearings is established only after mounting and adjustment against a counter-oriented bearing. The radial clearance for double-row tapered roller bearings follows the values provided in the table below.

    Cages

    • Standard cages are made of high-quality stamped steel.
    • For larger bearings, machined brass cages are used.
    • For special applications, injected nylon 66 cages may be employed.

    Minimum Load

    To prevent destructive sliding between rollers and raceways caused by inertial forces and lubricant friction during high-speed operation, a minimum radial load must be applied. This can be estimated using the formula:

    Frm = 0.02C

    Where:

    · Frm — Minimum radial load (N)

    · C — Basic dynamic load rating (N)

    Single-Row Tapered Roller Bearings

    Dynamic Equivalent Load

    · When Fa / Fr ≤ e:

    P = Fr  (kN)

    · When Fa / Fr > e:

    P = 0.4Fr + YFa  (kN)

    Where: e and Y are provided in the bearing tables.

    Note on Axial Component Force

    When calculating the dynamic equivalent load, the axial component force generated under radial loads must be considered. The formulas account for various mounting configurations and load conditions. These formulas apply only when bearings are adjusted to zero clearance without preload.

    In the illustrated configurations, Bearing A always carries radial load Fra, and Bearing B always carries radial load Frb. Both Fra and Frb are treated as positive. Radial loads act at the pressure center (denoted as a in bearing tables). Additionally, an external axial force Ka acts on the shaft or housing. The axial load factors for A and B can be found in the bearing tables.

    Static Equivalent Load

    P0 = 0.5Fr + Y0Fa

    Where: Y0 is provided in the bearing tables.

    Double-Row Tapered Roller Bearings

    Dynamic Equivalent Load

    P = Fr + Y1Fa

    Static Equivalent Load

    P0 = Fr + Y2Fa

    Values for e, Y1, Y2, and Y0 are provided in the bearing tables.

    Frequently Asked Questions
    Q
    What are the three main structural types of tapered roller bearings?
    Tapered roller bearings are classified into three types: single-row, double-row, and four-row. Each type is designed to meet different load capacity and application requirements, with double-row and four-row configurations offering higher load ratings for demanding industrial uses.
    Q
    What dimensional standards apply to tapered roller bearings?
    Single-row tapered roller bearings are available in both metric and inch series. Metric series bearings conform to ISO 355:1977, F-J prefix bearings comply with AFBMA Standard 19.1, and inch series bearings comply with AFBMA Standard 19 (1974).
    Q
    What is the maximum allowable misalignment for single-row tapered roller bearings?
    The maximum allowable misalignment between the inner and outer rings of single-row tapered roller bearings is 3 arcminutes. Strict concentricity between the bearing bore and housing bore must be maintained during installation to avoid premature bearing failure.
    Q
    What tolerance classes are available for tapered roller bearings?
    For metric bearings, available tolerance classes include P6X, P6, P5, P4, and P2 in addition to the standard normal tolerance. P5 and higher are used for machine tool spindles. For inch bearings, tolerance classes CL2, CL3, CL0, and CL00 are available upon request.
    Q
    What materials are used for tapered roller bearing cages?
    Cages for tapered roller bearings are generally made of high-quality stamped steel. For larger bearings, machined brass cages are used. In special applications, injected nylon 66 cages may be employed to meet specific operating requirements.
    Q
    How is the minimum radial load for tapered roller bearings calculated?
    The minimum radial load is calculated using the formula Frm = 0.02C, where Frm is the minimum radial load in Newtons and C is the basic dynamic load rating in Newtons. This minimum load is necessary to prevent destructive sliding between rollers and raceways during high-speed operation.