Caravel Shaft Brearings


Caravel bearings: when important projects are at stake Easy assembling and replacement Caravel water-lubricated bearings meet strict criteria in termsinner and outer tolerance: when needed, they are grindedexternally, to be assembled and replaced very fast.Noise and vibrations damping Water-lubricated bearings are the ideal solution to limit and control vibrations and noise: such a feature plays an important role on propeller shafts and indutrial applications where it happens that turning bodies are not perfectly balanced or when extreme precision is required and mandatory.When shaft rotation around its own axis does not coincidewith its geometric center, the rubber’s extreme elasticityabsorbs the vibrations in a very effective way.Laboratory tests have proved that vibrations do not evenget to the outer shell. The NBR rubber is perfect to preventdamages and shaft consumption. The “Ploughing” solutionThe innovative “Ploughing” system has been developed tomanufature large bearings (for shaft diameters from 80 to 600 mm) without extra time and costs to prepare and bulid theinner tools (outlined moulds) to vulcanize the rubber and get the desired shape.Besides, the system has more advantages:1) Higher inner diameter precision, got through a roundinner mould, easier to build. The round mould, with noprotursion, can be worked very easily, turned on the latheand grinded;2) Outlined longitudinal gooves, designed in relation to well known and worked out water flows which increase the reliability and duration of the bearing, especially when the shaft is quite heavy and must work horizontally.3) As a consequence of this production method, the usual delivery terms can go from 4 to 20 days.Usually big bearings can be provided in 30 days.The “Ploghing” system is an effective technique whichour company has developed to offer a concrete solutionwhen our clients need big bearings in a very short time. Spiral grooves bearingsCaravel bearings with involute channels have been tested under the most severe conditions, on vertical test benches applying considerable dynamic balancing loads in highly polluted and sandy water taken from the most critical environments.The shaft rotation activates a powerful pumping action supported by the grooves, with a considerably increased fluid velocity, a remarkable cooling, lubricating, and cleaning effect. Through these bearings the shaft is supported all along its length and its entire circumference and does not rotate in a polygonal bearing. Vibrations decrease to a negligible level; such an advantage is really important for bearings used onthe propeller shafts of large luxury yachts. Thanks to their great reliability, this type of bearing is particularly suitable for applications on engines designed to work in very sandy areas, or where few opportunities for fast repair and maintenance are avaiable. The radius of involute channels may vary depending on the shaft diameter and the rotation direction (right or left).

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