Nonetheless if the particles amount in oil bath is growing due to wear or foreign particles contamination it DO have influence on eC coefficient for oil bath lubrication. If the level of contamination is constant the similar results can be achieved for filter-less lubrication for example for oil bath lubrication.
9 to 12) that are used for elaboration of contamination factor coefficient for circulating oil lubrication with filtration are valid for different filtration grades and contamination classes. ( d + D) and viscosity ratio κ for given bearing.Value of contamination factor is elaborated basing on contamination class or filtering parameters, D pw mean diameter of bearing’s rolling elements for medium bearing’s diameter d m = 0,5 The e C value evaluation when contamination level is known Filter rating βx value is described as a ratio of particles of certain size upstream the filter to the quantity of the particles downstream the filter. Due to that fact not only the βx value is important but also the size x of the particles that it corresponds to. The greater the βx value is the more efficient the filter is for specified particle size. Three values of cleanliness are obtained after contamination class assessment for example for oil lubricants it would be −/15/12 or 22/18/13.įilter rating value βx is a measure that defines filter efficiency – it is the filter capability to stop contaminants of x size. The second method utilizes automatic particles count and present results for three sizes of particles: ≥ 4 μm, ≥ 6 μm and ≥ 14 μm. Two values of cleanliness level which corresponds to particles of sizes ≥ 5 μm and ≥ 15 μm are determined. One of the method of oil cleanliness assessment base on counting the amount of particles under the microscope. It allows to assess the oil cleanliness class basing on particles count in taken sample. Standardized method of contamination level classification of lubricant by solid particles has been described in ISO 4406 international standard. In bearing technology both static and dyna- mic load conditions has to be independently checked ( n 0, bearing failure may occur due to abrasive wear and operational bearing life might be lower than calculated modified life. In bearing technology both static and dynamic load conditions has to be independently checked. Nominal rating values of basic static load C 0 and basic dynamic load C has been provided in the charts. Size of the bearing that will be used in a particular solution is at first selected basing on: bearing’s load rating in relation to loads that are occurring, requirements on service life and reliability.
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