23268CA/W33 340*620*224mm Wind Turbine Generator Supporting Pitch Yaw Turntable Bearing

Spherical roller bearings

Spherical roller bearings have two rows of symmetrical rollers, a common sphered outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis

The centre point of the sphere in the outer ring raceway is at the bearing axis.

Bearing features

Accommodate misalignment Spherical roller bearings are self-aligning like self-aligning ball bearings or CARB bearings .

• High load carrying capacity

Spherical roller bearings are designed to accommodate both heavy radial loads and axial loads in both directions .

• Long service life

The rollers are manufactured to such tight dimensional and geometrical tolerances that they are practically identical in a roller set The symmetrical rollers self-adjust, providing optimal load distribution along the roller length and together with the special proile prevent stress peaks at the roller ends.

• Low friction

Self-guiding rollers keep friction and frictional heat at low levels  A loating guide ring guides unloaded rollers so that they enter the load zone in the optimal position .

• Robust

All spherical roller bearings contain strong window- or prong-type cages.

Designs and variants 

Standard assortment

The assortment of SKF spherical roller bearings is the widest available on the market.

The standard assortment includes:

• CC, CA and E design bearings

• sealed bearings

• bearings for vibratory applications

• bearings for wind energy applications

All spherical roller bearings areExplorer bearings and almost all bearings are available with the option of a tapered bore Depending on the bearing series, the tapered bore has:

• a taper 1:12 (designation sufix K)

• a taper 1:30 (designation sufix K30)

CC design bearings

• have two stamped window-type steel cages, an inner ring without langes and a loating guide ring centred on the inner ring.

• are indicated in the product table by the designation sufix C or CC

• are indicated in the product table by the designation sufix EC or ECC for larger bearings and have an optimized internal design for increased load carrying capacity

CA design bearings

• have a machined double prong-type brass cage, an inner ring with a retaining lange on both sides and a loating guide ring centred on the inner ring.

The langes on the inner ring are designed to keep the rollers in place when swivelling the bearing during mounting or maintenance and are not designed to guide the rollers or accommodate any axial load .

• are indicated in the product table by the designation sufix CA

• are indicated in the product table by the designation sufix ECA for larger bearings and have an optimized internal design for increased load carrying capacity

E design bearings

• have two stamped window-type steel cages, an inner ring without langes and a loating guide ring centred on the inner ring (d ≤ 65 mm) or on the cages (d > 65 mm).

• are indicated in the product table by the designation sufix E

• have an optimized internal design for increased load carrying capacity

Designation system

Preixes

BS2-.. Bearing, designated by a drawing number

ZE Bearing with SensorMount feature

Basic designation

Listed in table 4, page 30

Figure with four digits: drawing number identiication

Sufixes

Group 1: Internal design

BC Bearing for wind turbine main shafts with roller-guided cast iron cage

CA, CAC Retaining langes on the inner ring, guide ring centred on the inner ring, machined brass

cage

CC(J), CJ Flangeless inner ring, guide ring centred on the inner ring, two stamped steel cages

CCJA, EJA Flangeless inner ring, guide ring centred on the outer ring raceway, two stamped steel

cages

E Optimized internal design for increased load carrying capacity

213, 222 and 223 series: Flangeless inner ring and two stamped steel cages Annular

groove and three lubrication holes in the outer ring

d ≤ 65 mm: Guide ring centred on the inner ring

d > 65 mm: Guide ring centred on the cage

Group 2: External design (seals, snap ring groove, etc.)

-CS, -2CS Contact seal, NBR, on one or both sides

-CS2, -2CS2 Contact seal, FKM, on one or both sides

-CS5, -2CS5 Contact seal, HNBR, on one or both sides

-RS, -2RS Contact seal, NBR, on one or both sides

-RS5, -2RS5 Contact seal, HNBR, on one or both sides

K Tapered bore, taper 1:12

K30 Tapered bore, taper 1:30

Group 3: Cage design

F Machined steel cage, inner ring centred

FA Machined steel cage, outer ring centred

J Stamped steel cage, inner ring centred

JA Stamped steel cage, outer ring centred

MA Machined brass cage, outer ring centred 

Group 4.6: Other variants

R505 Bearing for railway axleboxes

VA405 Bearing for vibratory applications, surface-hardened stamped steel cages

VA406 Same as VA405, and PTFE coated cylindrical inner ring bore

VA991 Bearing for high-speed applications

VE552(E) Outer ring with three equally-spaced threaded holes in one side face to accommodate lifting

tackle The E indicates that appropriate eye bolts are supplied with the bearing

VE553(E) Same as VE552(E), but threaded holes in both side faces

VG114 Surface-hardened stamped steel cages

VQ424 Running accuracy better than C08 

Group 4.5: Lubrication

GEM9 Filled to 70 – 100% with SKF LGHB 2 grease

GLE Filled to 25 – 45% with SKF LGWM 2 grease

VT143 Filled to 25 – 45% with SKF LGEP 2 grease

VT143B Filled to 45 – 60% with SKF LGEP 2 grease

VT143C Filled to 70 – 100% with SKF LGEP 2 grease

W64 Solid Oil

W Without annular groove and lubrication holes in the outer ring

W20 Three lubrication holes in the outer ring

W26 Six lubrication holes in the inner ring

W33 Annular groove and three lubrication holes in the outer ring

W33X Annular groove and six lubrication holes in the outer ring

W77 Plugged W33 lubrication holes

W513 W26 + W33

Group 4.2: Accuracy, clearance, preload, quiet running

C08 Running accuracy to P5 tolerance class

C083 C08 + C3

C084 C08 + C4

C2 Radial internal clearance smaller than Normal

C3 Radial internal clearance greater than Normal

C4 Radial internal clearance greater than C3

C5 Radial internal clearance greater than C4

P5 Dimensional and running accuracy to P5 tolerance class

P6 Dimensional and running accuracy to P6 tolerance class

P62 P6 + C2

Group 4.1: Materials, heat treatment

235220 Case-hardened inner ring with a helical groove in the bore

HA3 Case-hardened inner ring

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