tailieunhanh - The Design of Rolling Bearing Mountings Part 15

Tham khảo tài liệu 'the design of rolling bearing mountings part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Glossary Contamination factor V The contamination factor V indicates the degree of cleanliness in the lubricating gap of rolling bearings based on the oil cleanliness classes defined in ISO 4406. When determining the factor a23 and the attainable life V is used together with the stress index fs and the viscosity ratio K to determine the cleanliness factor s. V depends on the bearing cross section D d 2 the type of contact between the mating surfaces and especially the cleanliness level of the oil. If hard particles from a defined size on are cycled in the most heavily stressed contact area of a rolling bearing the resulting indentations in the contact surfaces lead to premature material fatigue. The smaller the contact area the more damaging the effect of a particle above a certain size when being cycled. Small bearings with point contact are especially vulnerable. According to today s knowledge the following cleanliness scale is useful the most important values are in boldface V utmost cleanliness V improved cleanliness V 1 normal cleanliness V 2 moderately contaminated lubricant V 3 heavily contaminated lubricant Preconditions for utmost cleanliness V bearings are greased and protected by seals or shields against dust by the manufacturer grease lubrication by the user who fits the bearings into clean housings under top cleanliness conditions lubricates them with clean grease and takes care that dirt cannot enter the bearing during operation flushing the oil circulation system prior to the first operation of the cleanly fitted bearings and taking care that the oil cleanliness class is ensured during the entire operating time Guide values for V D-d 2 mm V Point contact required oil cleanliness class according to ISO 4406 guide values for filtration ratio according to ISO 4572 Line contact required oil cleanliness class according to ISO 4406 guide values for filtration ratio according to ISO 4572 11 8 P3 200 12 9 P3 200 12 9 P3 200 13 10 P3 ằ 75

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