Strong and maintenance-free bearing of the crane trolley wheels

This trolley runs smoothly in continuous operation even in severe weather conditions.

This crane trolley runs on a crane girder retreaded by Kröger Kranbau und Industrieservice. As the crane is used outdoors in a very dirty working environment, the bearings for the running wheels must be as maintenance-free and weather-resistant as possible. The bearing points are also inaccessible or only accessible to a limited extent, making a lubricant-free bearing indispensable. Today, iglidur plain bearings are used, which both absorb the high load of the crane trolley and run perfectly despite severe weather conditions.

Profile

What was needed: iglidur plain bearing
Requirements: Corrosion-resistant, lubrication- and maintenance-free, resistant to dirt, stable under high loads
Industry: Cranes
Success for the customer: With lubrication- and maintenance-free plain bearings made of iglidur, a bearing solution was found that is as weather-resistant as it is stable.

Problem

A permanently maintenance-free bearing should be found for the four wheels of a trolley. The crane trolley is to travel on a refurbished crane girder that will be used outdoors. The environment is accordingly changeable. Dirt, water, snow and ice will reach the bearing points throughout the year. It is difficult to lubricate the bearings on the crane trolley and is also undesirable due to the effect of dirt. Nevertheless, the bearing points are exposed to high pressure. As the refurbished crane girder is not flat, it is possible that the rollers are not always in full contact with the girder. This additionally increases the pressure on individual rollers.

Solution

A solution for the broad requirement profile was found with special polymer bearings for high loads. In this application, the bearings made of the material iglidur fulfil both the high requirements for stability in continuous operation and for flexibility in outdoor use. The polymer bearings are free of corrosion and do not have to be externally lubricated or otherwise maintained thanks to the incorporated solid lubricants. This also prevents dirt from adhering to the bearings. The iglidur bearings are run with a slight (approx. 2°) interlocking angle. Other bearings were out of the question here.

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