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Slewing Bearings      

Slewing bearings are large- size bearings, which can carry combined loads: axial, radial load and tilting moment. They are usually equipped with fixing bolt holes, Internal or external gear, lubrication holes and sealing elements, consequently machinery structure can be made compact, guided rotary convenient, mounting and maintenance easy.

Available slewing bearings are: bearings with internal gear, external gear, external gear or non-gear, four-point contact ball bearings, double row angular contact ball bearings, cross cylindrical roller bearings and three row combined cylindrical roller bearings, among which four-point contact ball bearings have the higher static load carrying capacity while cross cylindrical roller bearings have the higher dynamic load carrying capacity. The pre-interference of cross-tapered roller bearings provides higher supporting rigidly and better rotary accuracy. with wider width and different raceways being capable of carrying any direction loads, three row combined cylindrical roller bearings have the same loads therefore compact machinery structure can be obtained. This is a kind of heavy-duty slewing bearings.

The typical applications of the slewing bearings: lift and transport machinery, excavation machinery, building machinery, harbor machinery, cargo lifting machinery on ships, and even high-precision radar antenna mounts and missile launching pads.

The Code Expressions of Slewing Bearings
In this catalogue, there are two kinds of code expressions of LYC bearings 

1. The code expression shown in the bore diameter and structure of bearings – there are two parts, basic-code and suffix. The expressions of type and structure of the basic-code are as follows:

Type and Structure

Gear Form

Non-Gear

External-Gear

Internal-Gear

Four-point contact ball bearings

78000

178000

278000

Double row angular contact ball bearings

578000

678000

778000

Cross cylindrical roller bearings

79000

179000

279000

Cross tapered roller bearings

579000

679000

779000

Three row combined cylindrical roller bearings

539000

639000

739000

In the suffixed symbols, G shows that the bearing ring is made of 5CrMnMo steel. While G2 shows the ring is made of 50Mn.

LYC Slew Ring Catalog

2. The code expression shown in pitch circle diameter of rolling elements, rolling element diameter, form of gear, structure of raceway and etc.

  X     X    X  . X X  .  X X X X 

X -----------------------------   Pitch circle diameter of rolling elements (mm)

        X -----------------------------  Rolling element diameter or mean diameter (mm)

             X ------------------   Engaged gear-form: 0-non-gear
                                         1-less modular external gear
                                         2-more modular external gear
                                         3-less modular internal gear
                                         4-more modular internal gear

                       X X   ------------Structure of raceway:
                                          1-four-point contact ball bearing or cross-cylindrical roller bearing  
                                          2-double row self-aligning ball bearing or cross-tapered roller
                                          bearing
                                          3-three row combined cylindrical roller bearing

                              X X X X-- Rolling element form: 0-ball, 1-roller

LYC Slew Ring Catalog
 

                     

      LYC North America, Inc. Tel:  (630) 262-0601, Fax: (630) 262-0638.  Email: sales@lycbearings.com

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Last modified: 03/11/09