Abstract
This paper presents a research into reliability calculations of agriculture double universal joint shafts based on temperature measuring in cardan-type universal joint bearing assemblies. Special laboratory equipment was developed for this research which is presented in the paper. The objective of this research was to test the real life span of universal joint shafts in the laboratory and in field, to obtain the results which can be used to improve the reliability of universal joint shafts. If the presented research were used along with maintenance measures recommended in the paper and with proper use, the level of reliability of the shafts would be 2.1 times higher. The presented results of the research showed that needle bearings, i.e. bearing assemblies of the joints, are the most critical elements on universal joint shafts and are possible causes of their lower reliability. The second universal joint is the part with the lowest reliability in the observed technical system.
Highlights
Nowadays, agriculture is changing in response to the requirements of modern society, where ensuring food supply through practices such as water conservation, reduction of agrochemicals and the required planted surface, which guarantees high quality crops are in demand (Duarte-Galvan et al, 2012)
The agriculture universal joint shafts in laboratory tests withstood 304 operation hours without any visible damages, while the samples tested in field withstood 139 operation hours
The research into reliability presented in the paper in the form of technical diagnostics was based on the observed principle of variation of measured diagnostic parameters on the laboratory and the field samples of the shafts, which resulted in obvious difference in variation of reliability
Summary
Agriculture is changing in response to the requirements of modern society, where ensuring food supply through practices such as water conservation, reduction of agrochemicals and the required planted surface, which guarantees high quality crops are in demand (Duarte-Galvan et al, 2012). In the period from 2003 to 2013 there occurred four failures on double agriculture universal joint shafts reported in the Republic of Serbia. They were caused by fractured joints which occurred due to inappropriate maintenance and use. One of these accidents caused the death of one operator (Asonja еt al., 2013c). The research conducted in the territory of the Autonomous Province of Vojvodina (Republic of Serbia) showed that injuries suffered by agricultural machine operators and workers made up 14.05% of the total number of reported injuries, and 16.86% of these injuries were caused by implements
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