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Times:2019-03-22Clicks:1634
slewing bearing
A slewing bearing or slewing ring is a rotational rolling-element 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 metres diameter and fit over a 3.5 metre axle.
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.
Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components. The bearing raceways, in conjunction with the rolling elements and cages or spacers, are designed to accommodate loads acting singly or in combination, and in any direction.
Application engineering service
Selecting the appropriate slewing bearing can be a challenge, particularly if there are stringent technical, reliability or economic demands. In these cases, for example, application engineering service can provide advanced calculations and simulations utilizing state-of-the-art analyse methods to optimize and validate the best design to meet the customer requirements.
Remanufacturing service
We also offers worldwide a wide range of added value services for slewing bearings, including remanufacturing. A slewing bearing with only 30% left of its calculated service life can be well worth remanufacturing. standardized remanufacturing processes can extend significantly the service life of critical equipment.
All of these combine to improve rotating equipment performance and reduce total cost of ownership.
Bearing features
Depending on their design, slewing bearings have the following features:
High load carrying capacity
High stiffness for rigid bearing application
Low friction
Long service life
Surface protection and corrosion resistance
Integration of additional features, including:
driving mechanism
control devices
lubrication systems
monitoring systems
sealing cassettes
Designs
We manufacture standard and customized slewing bearings in various designs with outside diameters from 0,1 to 18 m to meet the demands of particular applications. The most common designs are:
Four-point contact ball bearings
Optimal economy and capacity for given dimensions or when replacing existing multi-bearing arrangements
Four-point contact ball bearings
80% increase in capacity compared to a same-sized single-row four-point contact ball bearings
Crossed cylindrical roller bearings
High stiffness and constant resistance to rotation
Triple row roller bearings
Provide highest capacity for a given diameter
Wire race bearings
60% lighter compared to same-sized all-steel bearings
We extensive experience in designing and manufacturing customized or special slewing bearings. Examples are:
Combined roller/ball bearings
Segmented bearings
Inserted raceways bearings
Applications
We offers high-performance slewing bearings for a wide range of applications, including:
Wind turbines
Tunnel boring machines
Excavators
Forestry vehicles
Rail vehicles
Dockside and deck cranes
Mobile cranes
Water treatment equipment
Bottle filling systems
Metals
Material handling
Marine pods
Offshore buoys
Stacker reclaimers
Surveillance systems (e.g. radars, cameras)
Medical equipment
Tidal turbines
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