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Powerful Spherical Roller Bearings from China Suppliers - High-Quality Bearings from a Leading Factory

Spherical roller bearings are engineered with an innovative design featuring an inner ring that includes two rows of raceways and an outer ring with a spherical raceway. The barrel-shaped rolling elements ensure optimal performance. The unique alignment of the outer ring raceway with the center of the bearing enhances self-alignment, making these bearings highly effective in compensating for misalignment due to inaccuracies in the shaft or housing as well as shaft deflection. Designed to handle not only radial loads but also specific bidirectional axial loads, these bearings are ideal for applications exposed to vibration and impact. As a leading China supplier and factory of high-quality spherical roller bearings, we are committed to providing durable and reliable solutions for your industrial needs

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. Bearings of series 240 and 241 have a tapered bore with a taper of 1:30 (suffix code K30), while other bearings feature a tapered bore with a taper of 1:12 (suffix code K).

Design

C / EC Type C and EC Designs

These bearings feature symmetrical rollers and a stamped steel cage. The guide ring is centered on the inner ring. Type EC bearings incorporate reinforced rollers for increased load capacity. Type C bearings employ optimized surface finishing on rollers and raceways to improve roller guidance and reduce friction.

CA / ECA Type CA and ECA Designs

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 and ECA bearings utilize the same surface finishing as Type C bearings. Type ECA bearings incorporate reinforced rollers for enhanced load capacity.

Oil Grooves and Holes

Suffix code W33 denotes bearings (Types C, EC, CA, and ECA) with oil grooves and holes on the outer ring.

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) and all series 213 bearings.

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 bearing specification 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

F_rm = 0.02 × C_r

Where:

F_rm — Minimum radial load (N)
C_r — 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 F_a / F_r ≤ e

P = F_r + Y₁ · F_a

When F_a / F_r > e

P = 0.67 · F_r + Y₂ · F_a

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 = F_r + Y₀ · F_a

The calculation coefficient Y₀ for each bearing is provided in the bearing tables.

Frequently Asked Questions

QWhat are the main advantages of HRB spherical roller bearings over traditional spherical roller bearings?

HRB spherical roller bearings feature optimized raceway geometry and surface finishing (Type C and CA), which minimize friction and allow them to operate at lower temperatures, support heavier axial loads, and achieve higher rotational speeds compared to traditional spherical roller bearings.

QWhat is the difference between Type C/EC and Type CA/ECA bearing designs?

Type C/EC bearings use a stamped steel cage with the guide ring centered on the inner ring, while Type CA/ECA 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 EC and ECA variants incorporate reinforced rollers for higher load capacity.

QWhat does the suffix code W33 mean on a spherical roller bearing?

The suffix code W33 indicates that the bearing (Types C, EC, CA, or ECA) is equipped with annular oil grooves and three oil holes on the outer ring, designed to facilitate effective lubrication in the application.

QWhich internal clearance grade is most commonly required for spherical roller bearing applications?

While standard spherical roller bearings come with normal radial internal clearance, most applications require C3 clearance (larger than normal). Some demanding applications may even require C4 clearance. C2 clearance (smaller than normal) is available for certain sizes where tighter fits are needed.

QHow is the minimum radial load for a spherical roller bearing calculated?

The minimum required radial load is estimated using the formula F_rm = 0.02 × C_r, where F_rm is the minimum radial load in Newtons and C_r is the basic dynamic load rating. If the weight of supported components and external forces do not meet this requirement, supplemental radial loads must be applied.

QCan HRB spherical roller bearings operate reliably at high temperatures?

Yes. Standard HRB spherical roller bearings undergo special heat treatment that ensures no significant dimensional changes occur at operating temperatures exceeding +200°C, making them suitable for high-temperature industrial applications.