231.20.1000.013 Typ 21/1200.1

KD210 series 231.20  281.30Type
  • KD210 series 231.20  281.30Type
  • KD210 series 231.20  281.30Type

231.20.1000.013 Typ 21/1200.1-KD210 series 231.20 281.30Type

The external gear with inner flange slewing bearing is a robust rotational solution engineered for equipment requiring a reliable mounting interface alongside efficient direct drive capability. This design incorporates an inner ring with an integral flange and an outer ring with external gear teeth, offering a practical combination of simplified assembly and effective power transmission.



Application Areas:

Compact crane turntables and lifting equipment

Aerial work platforms and access equipment

Solar tracking systems with space constraints

Light to medium-duty industrial turntables

Packaging and handling machinery



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

KD210 series 231.20  281.30Type
Type :231.20.1000.013 Typ 21/1200.1
Brand :LYMC
Weight
[KG] :83,0
Ball Track Diameter
DL [mm] :1094
Outside Dia
Da [mm] :l198,4
Inner Dia
Di [mm] :984
Total Height
H [mm] :56
External Bolt Circle Dia
La [mm] :1135
Internal Bolt Circle Dia
Li [mm] :1012
Number Of Bolt Holes Per Hole Circle
na :22
Bolt Hole Dia
B/M [mm] :M 12
ni :20
B/M
[mm] :18
t [mm] :20
Number Of Grease Nipples
n₁ :4
Diameter
O[mm] :1092,5
Diameter
U[mm] :1095,5
Diameter
A [mm] :-
Diameter
C [mm] :1055
Distance At Bottom Outer Ring/Inner Ring
Hu[mm] :10,5
Distance At Bottom Outer Ring/Inner Ring
Ho[mm] :-
Gear P.C.D.
d[mm] :1184
Module
M[mm] :8
Number Of Teeth
Z :148
Tooth Width
b[mm] :45,5
K.M
[mm] :-0,8
Permissible Tangentialforces, Normal
[kN] :18,93
Permissible tangentialforces, Maximum
[kN] :37,86
Bearing Clearance
Axial [mm] :0.5
Radial [mm] :0.5

Characteristics

✦ Bearing type – Single-row four-point contact ball slewing bearing with external gear and integral inner flange.

✦ Gear teeth – External gear teeth are integrally hobbed on the outer ring with a 20° pressure angle spur profile.

✦ Flange design – Inner ring features an integral flange with equidistant mounting holes for structural attachment.

✦ Raceway profile – Gothic-arch raceway geometry ensures four-point contact between balls and raceways.

✦ Hardening – Raceways are induction-hardened to 58–62 HRC with a case depth of 2.0–3.0 mm.

✦ Sealing – Double lip seals are fitted on both sides to retain lubricant and exclude contaminants.


Features

✦ Space-saving installation – The integral inner flange design eliminates the need for additional adapter plates, reducing axial height.

✦ Simplifies drive integration – External gear allows direct pinion engagement, simplifying the drive chain.

✦ Extends gear life – Induction-hardened gear teeth resist wear and pitting, ensuring long-term reliable torque transmission.

✦ Provides high load capacity – Four-point ball contact distributes axial, radial, and moment loads efficiently.

✦ Minimizes maintenance – Double lip seals provide effective contamination protection, extending regreasing intervals.

✦ Facilitates mounting – The flange design allows for quick alignment and bolt-fastening during installation.


Further Reading