The service life of a gearbox is determined by many factors. Thebearings in the gearbox play a major role since they themselvesdeliver an important function, and in addition interact with theshafts, the casing and the oil. Without a doubt, the sizing of thebearings is of great importance for the gearbox reliability. Sincemore than 50 years the bearing dynamic carrying capacity has beenused to determine a suitable size needed to deliver a sufficientfatigue life – but despite the advanced calculation methodsdeveloped, the methods do not fully predict service life. Producersof high quality bearings have introduced high performance classbearings and, lacking better ways to express the improvedperformance, this is only represented by increased dynamic carryingcapacity. The availability of high-strength shaft materials incombination with bearings with high carrying capacity allowsslimmer shafts to be used. The modulus of elasticity remains thesame, so seat design for bearings and gears must be given closeattention. This paper covers the following: sizing of bearingsbased on dynamic carrying capacity and how this relates to servicelife; how the design of the interface between bearing and shaftsshould be adapted to modern shaft materials; how the design of theinterface between bearing and gearbox casing influences servicelife of the gearbox; and influence of modern electric motor speedcontrols in bearing type selection.
- Edition:
- 11
- Published:
- 10/01/2011
- Number of Pages:
- 17
- File Size:
- 1 file , 1.1 MB
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