Bearings improve life of crane cable sheaves
A
Schaeffler (UK) product story
Edited by the Engineeringtalk editorial team
Jul 15, 2009
Schaeffler has reported that its roller bearings have improved the life of crane cable sheaves at Liebherr in Germany.
Used for the first time to construct and erect a wind turbine in Cuxhaven, Germany, Liebherr's LR 11350 crawler crane sets new standards in terms of its lifting capacity (up to 1,350 tonnes) and has a maximum lift height of 223m.
Rolling bearings from Schaeffler are being utilised in heavy-duty crawler cranes, floating cranes and lifting bridges.
It is driven by a six-cylinder turbo diesel engine.
The design principle of the crane enables economical and straightforward transportation of the crane components and rapid set-up time.
The diesel engine, hydraulics, electrical systems and crane cab are transported as a complete unit.
A range of boom systems gives the crane good versatility, with or without a derrick system.
To date, Schaeffler's Power Transmission Group has supplied more than 100 cylindrical roller bearings for the LR 11350's cable sheave supports.
The heavy duty SL04 bearings have a 160mm bore, an outside diameter of 220mm and a width of 80mm.
These bearings provide high load-carrying capacity and long service life and are protected by Corrotect.
This coating, specially developed by engineers at Schaeffler, prolongs the life of the bearing and prevents, for example, corrosion underneath the sealing lips.
In turn, this prevents premature wear of the lips and ingress of dirt and water to the bearing.
Most of the sheaves used in today's mobile and crawler cranes are manufactured from synthetic materials such as cast polyamide.
These materials offer the required elasticity, high wear resistance, high durability (even at low temperatures), and good resistance to lubricants as well as the often-harsh outdoor conditions.
When selecting bearings for these types of applications, a range of design factors should be considered, including whether the bearings are maintenance-free; how easy they are to assemble; and their static and dynamic load-carrying capacity.
Due to the different coefficients of expansion of the plastic sheave and the steel bearing, it is also important to carefully examine and select a suitable bearing fit and internal clearance.
In another application, Schaeffler's SL04 bearings (260mm bore, 400mm outside diameter, 160mm width) are being utilised to support the Hermod crane ship or floating crane.
With a crew of more than 300, the semi-submersible Hermod crane vessel is designed for offshore operations, including bridge construction projects and the erection of oil-drilling platforms.
Used in tandem, these types of crane can lift up to 8,100 tonnes and a radius of 39m.
The Corrotect-coated bearings also have special seals that protect the bearings from salt-water corrosion and temperature fluctuations.
On the Kampenbrug 400m-long, 20m-wide lifting bridge in the Netherlands, the cable sheaves are actually gold-plated.
This is to provide better protection against rust and corrosion.
Schaeffler's double-row spherical roller bearings with a cylindrical bore transmit the loads from the 30m moving section of the bridge, which is lifted and lowered at regular intervals through the day, to enable ships to pass through.
The SL04 range of cylindrical roller bearings with snap ring grooves is a full complement, double-row unit that comprises solid outer and inner rings with ribs, rib-guided cylindrical rollers and sealing rings.
The outer rings have grooves for retaining rings.
The inner rings are axially split, are 1mm wider than the outer rings and held together by a rolled-in steel strip.
Due to their snap ring grooves, the bearings are locating bearings, providing high rigidity and supporting axial forces in both directions, as well as high radial forces.
The full complement design (in other words, the bearings have the maximum possible number of rolling elements) means the units offer maximum basic dynamic and static load ratings.
Sealing rings on both sides protect the running system against contamination and moisture.
The cylindrical roller bearings are greased with lithium-based soap grease and can be relubricated via the outer and inner ring.
Grooves in the outer rings mean the bearings can be easily axially located, making them ideal for cable sheave applications.
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Contact Schaeffler (UK)
Tel +44 121 351 3833
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