This paper deals with the issue of using ecological oils in the sliding pair of hydraulic and transmission systems working in the area of agriculture. The sliding pair included a B 60 bearing and a journal with contact surface made of 14 220 steel. The experimental tests were carried out with two oils: the Fuchs Plantohyd 46 S ecological oil and PP 80 reference oil (producer: Slovnaft) which is a commonly used lubricant in given conditions. The results of the experiments were statistically processed and based on them, friction coefficient and temperature, both depending on the test duration, was evaluated. Consequently, the weight loss and roughness change of both tribological elements were statistically processed.
The precision and stability of adjusted temperatures are critical requirements for electromechanical thermostats. The key element in meeting the requirement is a thermostat bellows. It is a convertor of pressure into force that actuates the mechanical system of the thermostat. Convolutions enabling the axial movement of the bellows cause that the bellows is partly behaving as a spring. Therefore, the bellows has its own spring rate. The setting of the bellows spring rate influences the critical parameters of the thermostat. The aim of the article is to find the difference between the setting done by bellows producer and setting done by thermostat producer and its influence on the thermostat adjustment.
The eff ect of loading on the properties of selected sliding pair is monitored and analysed in the submitted contribution. The obtained results of dynamic loading were also compared with static loading. The experimental tests were performed using the testing machine Tribotestor M10. Steel 11 600 was selected as a material sample for the sha as it belongs to commonly used materials in the manufacturing of agricultural components of sha type or pin type. A full-bronze centrifugally moulded bearing shell from the material CuSn12 was selected as the second element of friction pair. Two oils were selected for lubrication of friction node -the mineral gear oil Madit PP80 and ecological oil Plantohyd 46 S. The selected friction pairs were tested in three loading regimes according to the methodology (two dynamic processes and one static process). 60 tribological tests were performed, i.e. 10 for each type of loading and lubrication. The weight losses of the friction pair elements were part of the tracked and analysed parameters. The polluted oil was examined using the ferrographic analysis to verify the weight losses. The abrasion particles of friction pair and their contribution to oil pollution were also analysed. Following the performed experiments diff erent eff ects of loading regimes may be concluded, essentially in terms of wear size and the number and size of wear particles as well. The obtained results confi rmed that the power spectral density of generated signal is probably an important criterion for assessment in terms of simulated random dynamic load in given experiment. In terms of technical application in loading processes -power spectral density is actually the amount of energy supplied to the process.
Cathodic protection survey data from a major gas transmission pipeline is reviewed to determine the accuracy of the original design calculations. The calculations used to predict cathodic protection requirements are discussed to show the advantages and limitations of different methods. The analysis shows that the design calculations can predict overall trends, but significant variations can exist locally due to variations in the pipeline and its environment. Observed coating conductance values and recommendations for improved methods are given to aid in the design of future pipeline cathodic protection systems.
The scientific article titled “Experimental comparison of the tribological properties of selected surfaces created by thermal spraying technology” deals with the surface condition of selected pairs working within the mixed friction before and after experimental tests. Based on the chosen methodology, the experimental tests were performed on the Tribotestor M’06 testing machine. The ecological oil MOGUL HEES 46 (manufactured by Paramo) was used as a lubricant. The tests were performed on selected material pairs. The first friction element was a shaft of steel 14 220. The second friction element was a steel plate of steel 11 373 with a friction surface created by two materials, i.e. CuSn10 and NP 40. The results are statistically elaborated and illustrated in figures and tables.
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