191.32.3550.990.41.1502

RD900 Series 191 Roller bering
  • RD900 Series 191 Roller bering
  • RD900 Series 191 Roller bering

191.32.3550.990.41.1502-RD900 Series 191 Roller bering

The three-row roller slewing bearing with external gear is a heavy-duty rotational component engineered for applications where maximum load capacity and structural integrity are paramount. This design incorporates three independent rows of cylindrical rollers, each dedicated to managing specific load directions, delivering performance levels that meet the most stringent requirements in heavy machinery and industrial equipment.



Common Applications:

  • Large cranes and construction equipment

  • Heavy excavators and mining machinery

  • Wind turbine yaw and pitch mechanisms

  • Radar and antenna positioning systems

  • Heavy-duty turntables and rotary platforms

  • Offshore and marine equipment



High load-carrying capacity
Resistance to high and low temperatures
Noise-free operation
Strictly controlled tolerances and appropriate internal clearance
Long service life and low maintenance requirements
Prevention of unexpected downtime (avoiding bearing fracture, seizure, and safety incidents caused by such failures, with anti-tilting capability)

Dimension and Parameters

RD900 Series 191 Roller bering
Type :191.32.3550.990.41.1502
Brand :LYMC
Weight
[KG] :3249
Outside Dia
Da [mm] :3889,6
Inner Dia
Di [mm] :3332
Total Height
H [mm] :181
External Bolt Circle Dia
La [mm] :3705
Internal Bolt Circle Dia
Li [mm] :3410
Number Of Bolt Holes Per Hole Circle
n :66
Bolt Hole Dia
B [mm] :39
M
[mm] :36
Number Of Grease Nipples
n₁ :8
Diameter
O[mm] :3591
Diameter
U[mm] :3580
Ring Height
H₁[mm] :139
Ring Height
H₂[mm] :172
Distance At Bottom Outer Ring/Inner Ring
Hu[mm] :9
Distance At Bottom Outer Ring/Inner Ring
Ho[mm] :42
Gear P.C.D.
d[mm] :3828
Module
M[mm] :22
Number Of Teeth
Z :174
X.M
[mm] :11
K.M
[mm] :- 2;2
Tooth Width
b[mm] :139
Permissible Tangentialforces, Normal
[kN] :265/J
Permissible tangentialforces, Maximum
[kN] :531,8

Characteristics

✦ Three-row roller configuration – Two axial roller rows (upper and lower) and one radial roller row, each with cylindrical rollers for line-contact load distribution.

✦ External gear on outer ring – Gear teeth are integrally machined on the outer ring circumference, featuring a spur tooth profile with induction-hardened flanks to 50–55 HRC.

✦ Monolithic inner ring – The inner ring is manufactured as a single forging, containing both axial raceways and the radial raceway in a unified structure.

✦ Raceway hardening – All raceways are induction-hardened to 58–62 HRC with a case depth of 4–5 mm for extended wear resistance.

✦ Heavy-section outer ring – The outer ring features an increased radial thickness and a width-to-height ratio of 1:1.4, optimized for tilting moment resistance.

✦ Roller guidance – Rollers in each row are guided by machined brass cages with precision-milled pockets for reduced friction.


Features

✦ Load-independent roller paths – Each roller row handles a specific load direction, preventing cross-interference and ensuring predictable performance.

✦ High resistance to edge loading – The cylindrical roller profile is optimized to avoid stress concentration at roller ends, even under misalignment.

✦ Simplified condition monitoring – The robust design allows easy installation of sensors near each roller row for separate load monitoring.

✦ Quick adaptation to design changes – Modular ring construction permits changes to gear type, seal type, or bolt pattern without redesigning the entire bearing.

✦ Improved lubrication distribution – Optimized oil grooves ensure each roller row receives sufficient lubricant, even at slow speeds.


Further Reading