What is Slewing Bearings

The slewing bearing is a large bearing with a special structure that can bear comprehensive loads such as large axial loads, radial loads, and overturning moments at the same time, and integrates multiple functions such as support, rotation, transmission, and fixation.

Basic structure of slewing bearing

Slewing bearings are usually composed of four major components: inner ring, outer ring, rolling elements, and spacers. Because the core component adopts slewing bearing, it can bear axial force and radial force at the same time. There are many forms, but the structural composition is basically the same.

From left to right (upper part): 1. Outer ring (with or without teeth) 2. Sealing band 3. Rolling elements (balls or rollers) 4. Oil nipple

From left to right (lower part): 1. Plug 2. Taper pin 3. Inner ring (with or without teeth) 4. Isolation block or cage 5. Mounting hole (wire hole or light hole)

Applied materials for slewing bearings

Materials for rings and rolling elements

Generally, the rolling elements of slewing bearings are made of overall hardened carbon chromium bearing steel. The brand is made of GCr15 or GCr15SiMn steel; the slewing bearing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel. For specific conditions of use, use other grades of surface hardened steel, such as 42CrMo, 5CrMnMo, etc.

Cage material

Cages for slewing bearings have structural forms such as integral type, segmented type, and isolation block type. Among them, the integral and segmented cages are made of No. 20 steel or ZL102 cast aluminum alloy. The isolation block is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc.

Material for sealing ring

The material for the sealing ring of the slewing bearing is made of oil-resistant rubber or NBR.

The codes of ferrule materials and blank supply status are as specified in the table. "T" in the table indicates that the ferrule blank is supplied in a quenched and tempered state, and "Z" indicates that the ferrule blank is supplied in a normalized state.

Turntable bearing function

Its function is to connect the upper and lower parts of the machine together, and at the same time to support the weight of the upper part and the load generated when the machine is working, and to make the upper part of the machine rotate relative to the lower part (or the lower part to rotate relative to the upper part).

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