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1. Definition

    The Single-Row Four Point Contact Ball Slewing Bearing is composed of 2 seat-rings with compact structure and light weight, and the steel balls do contact with 4 points of the circular orbit, so it can undertake the Axial Force, Radial Force and Tipping Moment at the same time. By the way, it is suitable for many Engineering Machineries, for example, Slewing Conveyer, Welding Operation Machine, small & medium Crane, and so on.

2. Structure Drawing

3. Applications

(1). Wind generator

Tower and yaw bearings are installed in the junction of tower and the cockpit; pitch bearings are installed in each blade root and hub joints. Each wind turbine equipment use three sets pitch bearings and a set of yaw bearing. pitch bearing ring material select 42CrMo, treatment with the overall quenching, raceway select surface-hardening.

(2). Marine Crane

In general, marine crane use double-row different diameter ball, four-point contact ball, three-row roller inner gear structure slewing bearings.

(3). Offshore crane

According to different requirement for carrying capacity, offshore crane usually use four-point contact ball slewing bearing and three-row roller inner gear slewing bearing.

(4). Port mobile crane

Port cranes usually use internal or external gear, 4 meters in diameter three rows roller slewing bearings to withstand high overturning moment.

(5). Stacker-reclaimer

Slewing bearing stacker-reclaimer usually use is ball column combined type, three-row roller and cross-roller, the majority diameter over 3 meters. Due to poor working conditions, dusty, these bearings have high load capacity, long life and good sealing performance feature.

(6). Ferris wheel

Usually use four-point contact ball slewing bearing, diameter 4100mm, thickness 85mm.

(7). Ship unloaders

Usually use three rows of outer roller tooth structure, about 4 meters in diameter

(8). Tower crane

Usually use small size four-point contact ball bearings or double-row ball, diameter not more than 2 meters

(9). Radar antenna

Usually use three-row roller slewing bearing, slow rotation

(10). Shield

Diameter from 2.5 meters to 6 meters, some larger diameter, these bearings work in very poor conditions, bearing a large load, corrosion resistance, short life.

(11). Ladle turret in steel plant

Usually these bearing are three-row roller slewing bearings, because work in the dust and high temperature conditions, so s have high demands for maintain, grease and seal.

(12). Engineering machinery

Usually use small size four-point contact ball bearings or double-row ball, diameter not more than 2 meters.