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Spherical Roller Bearing

The spherical roller bearing has double-row rollers, a common spherical raceway on the outer ring, and two raceways on the inner ring that are tilted at an angle relative to the bearing axis. This ingenious structure enables it to have self-aligning performance, so it is not easily affected by the angle error between the shaft and the bearing box seat or the shaft bending, and is suitable for occasions where the angle error is caused by installation error or shaft deflection. In addition to being able to withstand radial loads, the bearing can also withstand bidirectional axial loads.

Design and variation

Product details

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Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [mm] D [mm] B [mm] C [kN] C₀ [kN] [r/min] [r/min]
22230CA
 150 270 73
232/850 CA/W33
 850 1500 515
248/800 CAK30MA/W20
 800 980 180
230/900 CA/W33
 900 1280 280
239/950 CA/W33
 950 1250 224
239/1060 CAF/W33
 1060 1400 250
249/1060 CAK30F/W33
 1060 1400 335
249/1120 CAF/W33
 1120 1460 335
238/1180 CAKFA/W20
 1180 1420 180
239/1180 CAKF/W33
 1180 1540 272
241/1180-2CS6K30/C3HGEA8
 1180 1850 670
249/1180 CAF/W33
 1180 1540 355
Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [in] D [in] B [in] C [Ibf] C₀ [Ibf] [r/min] [r/min]
22230CA
232/850 CA/W33
248/800 CAK30MA/W20
230/900 CA/W33
239/950 CA/W33
239/1060 CAF/W33
249/1060 CAK30F/W33
249/1120 CAF/W33
238/1180 CAKFA/W20
239/1180 CAKF/W33
241/1180-2CS6K30/C3HGEA8
249/1180 CAF/W33

Spherical Roller Bearings Types

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Structural Classifications of Spherical Roller Bearings

1. By Main Parameter Series

Light-Medium Series - 222xx

  • Features: Balanced cross-section, highest speed capability, 2.0°-2.5° misalignment angle
  • Bore range: 20-400mm
  • Typical models: 22210, 22212, 22215, 22220
  • Applications: Industrial gearboxes, medium-sized motors, conveyor pulleys

Heavy-Duty Series - 232xx / 223xx

  • Features: Larger roller diameter and quantity, maximum load capacity, 1.5°-2.0° misalignment
  • Bore range: 40-500mm
  • Typical models: 23218, 23220, 22308, 22316
  • Applications: Crusher eccentric shafts, vibrating screen exciters, wind turbine main gearboxes

Narrow Series - 213xx / 200xx

  • Features: Narrow axial width, compact design for space-constrained installations
  • Bore range: 20-240mm
  • Typical models: 21308, 21310, 21315
  • Applications: Paper machine dryers, printing machinery, precision drives

Medium Series (China Standard) - 35xx / 36xx

  • Features: Traditional GB standard series, excellent cost-performance, bore = last two digits × 5mm
  • Typical models: 3516, 3522, 3526, 3530
  • Applications: Cement mill rollers, mining equipment, steel rolling mills


Spherical Roller Bearings Features


1.Automatic self-aligning performance‌: The outer ring raceway of the spherical roller bearing is spherical, with good self-aligning performance, which can compensate for coaxiality errors and achieve automatic self-alignment.


‌2.Load bearing capacity‌: This type of bearing can withstand large radial and axial loads, and is particularly suitable for working under heavy loads or vibration loads, and has good impact resistance.


‌3.Structural features‌: The rollers and raceways of spherical roller bearings have a high degree of fit, severe relative sliding, and large friction, so the allowable operating speed is low.



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FAQ

Q1: What's the difference between spherical roller bearings and self-aligning ball bearings?

A: Spherical roller bearings use barrel-shaped rollers, delivering 3-5x higher load capacity for heavy impact loads. Self-aligning ball bearings use balls, offering higher speed capability for light/medium loads. Both provide similar misalignment angles (2°-3°), but roller bearings have longer life and greater rigidity.

Q2: Which is better, CA-type or CC-type cage?

A: Neither is universally better—it depends on application. CA-type brass cages are shock-resistant and high-temperature capable, ideal for crushers and steel equipment. CC-type steel cages are lightweight and high-speed, perfect for motors and gearboxes. CA costs 20-30% more than CC.

Q3: How do you mount tapered bore bearings?

A: Tapered bore bearings (K-type) require H adapter sleeves or AH withdrawal sleeves. Installation: 1) Slide sleeve onto shaft; 2) Mount bearing on sleeve; 3) Tighten locknut; 4) Expand bearing inner ring with taper for interference fit. No shaft shoulder needed, enabling easy removal.

Q4: Why must vibrating screen bearings use C4 clearance?

A: Vibrating screens generate alternating impact loads and high-frequency micro-movements. Standard clearance (C0/C3) causes raceway clamping and premature fatigue. C4 clearance (0.02-0.04mm larger than C3) provides extra roller movement space to absorb shock energy, extending life by 3-5x.

Q5: What's the typical service life of spherical roller bearings?

A: Under rated conditions (clean lubrication, no shock):
  • Standard grade: 30,000-50,000 hours
  • SKF Explorer/FAG X-life: 80,000-120,000 hours
  • Vibrating applications: 15,000-25,000 hours (requires C4 clearance)
  • Steel converters: 50,000-80,000 hours (requires regular maintenance)