Four point contact ball slewing bearing is one type of separated bearings which mean that one bearing can withstand axial force in both directions. The section of the raceway is peacch.When the bearing is unloaded or in pure radial load， there are four contact points between balls and rings. That is why it is called four point contact ball slewing bearing. When it bearings pure axial load， there are two contact points between balls and raceway,therefore, It can withstand axial force in both sides. Moreover， Four point contact ball slewing bearings can support moment load which make them with the performance of single low angular contact bearing and double row one.
The bearing are suitable for situations where two contact points exist when pure load or larger axial load is applied or high speed field.
4-point bearings do triple duty while saving space
A four-point contact ball bearing makes it easy to simplify machine designs that have a combination of radial, thrust and moment loads because it can handle all three simultaneously. They are primarily used for slow to moderate-speed applications, or where oscillatory movement is predominant.
A single four-point contact bearing usually makes a second bearing unnecessary, which provides some very important benefits:
space savings
weight savings
cost savings
rigidity and accuracy
faster installation
less maintenance
integral mounting holes, gears, etc.
Thanks to a unique ball path geometry that produces twice as many contact points, a four-point contact bearing can resist radial, thrust and moment loads individually or in any combination. It has one row of balls with an inner race and an outer race. The ball grooves are generated from two centers, with each radius slightly larger than the ball radius. Contact angles are typically 35° off the radial centerline, but can be varied to suit the application.
Important advantages
Four-point contact bearings are especially effective in applications in which the rotating element has a high ratio of diameter to axial length. Most have a large ratio of bore to section size: the larger this ratio, the thinner and more flexible are the individual races. Thin section bearing sizes range from 1" to 40" and slewing ring bearings range from 4" to 178" O.D.
We offer bearings of high-precision, high-speed and high-quality, which are widly used in many fields such as aerospace, aviation, navigation, metallurgy, petroleum, chemicals, power generation, pulp and paper, textiles, shipyards, mining machinery, engineering machinery, machinery, railways, automobiles, beer, cigarettes, household appliances, electrical and mechanical manufacturing, and so on. Typical applications include swing bearings (slewing rings) for cranes, excavators, aerial work platforms, gun turrets, radar pedestals, forestry equipment, agricultural vehicles, surveillance equipment, scanner equipment, excavators, cranes, tunneling machines, or material handling equipment. we offers light- to medium-duty turntable bearings or heavy-duty turntable bearings for even greater load-handling capabilities.