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Abstract
The article contains a research of the influence of design parameters (material, the jamming angle) on operation reliability of eccentric friction-type freewheel mechanisms using calculated and experimental techniques. As the investigated factor, the lower limit of the confidence interval for the time between failures is adopted It is shown that the necessary reliability of the eccentric freewheel mechanisms is ensured when jamming angles are 8–10° and when their elements are made of material 100Cr6. The reliability of such mechanisms is 1.7 times higher than of roller free-wheel mechanisms. The results of the research can be used when predicting the reliability of the mechanisms in the drives of machines.
Highlights
The general trend of increasing the resource and reliability of machines has led to the development of new designs of mechanisms – eccentric freewheel mechanisms [17]
As a criterion for reliability of eccentric freewheel mechanisms specified in the design, it is recommended to take the average time between failures [18–21]
Since the freewheel mechanisms relate to the repairable constructions, the formulas for determining the upper tT and lower tB limits for the confidence interval can be written as t T
Summary
One of the crucial components used in machines and providing automatic connection and disconnection of their kinematic circuits is the freewheel mechanism [1–8].Roller freewheel mechanisms are used the most widely in machines, which in some cases have the lack of reliability of work due to characteristic weaknesses: lack of durability and load capacity; large friction losses in the freewheeling period; high precision manufacture and installation of mechanism elements; considerable sensitivity to element deterioration [9–16].Recommendations to increase the reliability of the roller freewheel mechanisms do not guarantee failure restoration, but they lead to substantial increases in the cost of their manufacture.The general trend of increasing the resource and reliability of machines has led to the development of new designs of mechanisms – eccentric freewheel mechanisms [17].The main advantages of eccentric freewheel mechanisms are: the compactness of the structure per unit of transmitted load; slight effect of wear on performance; relatively low requirements to the accuracy of manufacturing and assembly of the mechanism elements; low friction losses during freewheeling period.Reliability of eccentric friction-type freewheel mechanisms is an integral indicator, which is influenced by various structural, technological and operational factors. Roller freewheel mechanisms are used the most widely in machines, which in some cases have the lack of reliability of work due to characteristic weaknesses: lack of durability and load capacity; large friction losses in the freewheeling period; high precision manufacture and installation of mechanism elements; considerable sensitivity to element deterioration [9–16]. The main advantages of eccentric freewheel mechanisms are: the compactness of the structure per unit of transmitted load; slight effect of wear on performance; relatively low requirements to the accuracy of manufacturing and assembly of the mechanism elements; low friction losses during freewheeling period. Reliability of eccentric friction-type freewheel mechanisms is an integral indicator, which is influenced by various structural, technological and operational factors. Theoretical consideration of their influence is a complex task. The evaluation of their reliability was carried out experimentally
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