984x1198x56 Four Point Contact Slewing Ring Bearing VLU 201094 VLU201094

A turret bearing or slewing ring bearing is a rotational rolling-element bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill. (To "slew" means to turn without change of place.)

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metre diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings.
Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.
Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.
As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.

Features of Slewing bearings:

1.with excellent rotational accuracy

2. Installing simplifies operation

3. Bear large axial and radial loads

4.Significant savings in installation space

5. High speed capability is limited to changes .

6. Shaft length and reduce processing costs, the geometry of thermal expansion

7. Nylon spacer, low inertia, low starting torque, easy to control angle indexing

8. Optimization of preload, rigidity, high precision guide rollers running  

9. Carburizing steel provides excellent impact resistance and surface abrasion resistance

10. Simple but adequate lubrication

Bearing Parts

Steel ball/Roller:carbon-chromium bearing steel GCr15SiMn or GCr15 for rolling Material
Cage: include integral cage, segment cage and spacer-type cage. We use 20# steel or copper for integral and segment cages, PA 1010 resin or QA110-3-105 albronze for spacer-type cages.
Seals:uses NBR or VI-TON, few felted wool.

Single row cross roller slewing bearing

It is composed of two or three rings. It has compact structure, light weight, high manufacturing accuracy, small assembly gap and high requirement for installation accuracy. Rollers are 1:1 cross-arranged. It can bear axial force, overturning moment and large radial force at the same time. It is widely used in lifting transportation, construction machinery and military products

Three row roller slewing bearing

It have three seat rings, the upper and lower raceways and the radial raceways are separated, so that the load of each row of roller can be determined accurately. Being able to bear all kinds of loads at the same time, it is the largest one of the four structural products with large axle and radial dimensions and firm structure. It is especially suitable for heavy machinery requiring larger diameter, such as bucket wheel stacker and reclaimer, wheel crane, marine crane, port crane, ladle turret and large tonnage truck crane. Heavy machinery and so on.

Single row four point contact ball slewing bearing.

It is composed of two seat rings. It has compact structure, light weight, and four-point contact between steel ball and arc raceway. It can bear axial force, radial force and overturning moment at the same time. The construction machinery of rotary conveyor, welding manipulator, small and medium-sized crane and excavator can be selected.

1.Q:Are you a factory or trading company?

   A:SEMRI Bearing is specialized in manufacturing and exporting bearings.

      SEMRI Bearing have own factory and warehouse.

2.Q:Can I get some samples and do you offer the sample free?

   A:Yes, sure, SEMRI Bearing are honored to offer you samples.Can you buy a ticket ?

3.Q:What is the payment?

   A: 30% T/T In Advance, 70% T/T Against Copy Of B/L  

   B: 100% L/C At Sight 

4.Q:What is the MOQ for bearing?
   A: SEMRI Bearing MOQ is 1 pc.

5.Q:What kind of service you can offer?

   A:Technology support;Installation guidance;OEM.