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Powerful Spherical Roller Bearings from China: Reliable Suppliers and Factory Solutions for High Performance

Spherical roller bearings are designed with an inner ring featuring two rows of raceways and an outer ring that has a spherical raceway, complemented by barrel-shaped rolling elements. The unique configuration ensures that the center of the outer ring raceway is aligned with the bearing center, which promotes optimal performance. With the two inner ring raceways inclined at an angle relative to the bearing axis, these bearings excel in self-alignment, making them highly effective in mitigating misalignment issues due to shaft or housing inaccuracies and shaft deflection, As leading suppliers from China, our factory produces top-quality spherical roller bearings that not only handle significant radial loads but are also capable of accommodating certain bidirectional axial loads. This versatility makes them ideal for demanding applications exposed to vibration and impact loads. Rely on our expertise as a trusted source for durable bearings that enhance the longevity and reliability of your machinery

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.

🔩 Heavy Load Capacity 🌡️ Lower Operating Temperature ⚡ Higher Speed Support 🔧 Cylindrical & Tapered Bore

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.

📌 Bore Taper Specifications:

▸ Bearings of series 240 and 241 have a tapered bore with a taper of 1:30 (suffix code K30)

▸ Other bearings feature a tapered bore with a taper of 1:12 (suffix code K)

Design

🔵 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.

🟢 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

🛢️

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.

🔖 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 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).

C2 — Smaller than Normal Normal — Standard C3 — Most Applications C4 — Heavy Duty

📋 Reference: Clearance grade limits 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)

⚠️ Note: 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

📋 Note: 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

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

Frequently Asked Questions (FAQ)

❓ What is the main advantage of HRB spherical roller bearings over traditional designs?

HRB spherical roller bearings feature optimized raceway geometry and surface finishing (Type C and CA) that significantly reduce friction. Compared to traditional spherical roller bearings, they operate at lower temperatures, support heavier axial loads, and achieve higher rotational speeds, making them ideal for demanding industrial applications.

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

Type C and EC bearings use a stamped steel cage with the guide ring centered on the inner ring. Type CA and ECA bearings feature flanges on the inner ring with the guide ring positioned between the two roller rows, and use a one-piece machined brass or steel cage. Both EC and ECA variants include reinforced rollers for increased load capacity.

❓ What 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. This feature facilitates effective lubrication directly through the outer ring, which is particularly beneficial in applications where re-lubrication is required during operation.

❓ Which internal clearance grade is most commonly used for spherical roller bearings?

While standard spherical roller bearings are supplied with normal radial internal clearance, most applications require bearings with C3 clearance (greater than normal). Some heavy-duty applications may require C4 clearance. C2 clearance (smaller than normal) is available for specific sizes where tighter fits are needed. Clearance selection should be based on operating temperature, fit, and load conditions.

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

The minimum 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 in Newtons. If the weight of supported components and external forces do not meet this minimum, supplemental radial loads such as increased belt tension or idle torque must be applied to prevent damaging sliding between rollers and raceways.

❓ Can spherical roller bearings handle angular misalignment between shaft and housing?

Yes. Spherical roller bearings are specifically designed with self-aligning capability, allowing them to compensate for angular misalignment between the inner and outer rings. This makes them well-suited for applications where shaft deflection or housing misalignment is expected. The permissible misalignment values under normal load and operating conditions are defined in the bearing specification tables.