45 research outputs found

    Žemės ūkio technikos naujovės

    No full text
    Vytauto Didžiojo universitetasŽemės ūkio akademij

    Vario lydinių dangų naudojimas žemės ūkio technikos slydimo trinties porų darbingumui didinti

    No full text
    Santr. angl., rusBibliogr.: p. 82 (9 pavad.)Vytauto Didžiojo universitetasŽemės ūkio akademij

    Medžiagų pjovimas : metodiniai patarimai laboratoriniams ir savarankiškiems darbams atlikti

    No full text
    Su bibliogrVytauto Didžiojo universitetasŽemės ūkio akademij

    Investigation of centrifugal oil cleaner

    No full text
    https://doi.org/10.15544/2669-1728.2021.26Straipsnyje pateikiama alyvos klampos ir temperatūros įtaka centrifuginio alyvos valytuvo rotoriaus greičiui tyrimų rezultatai. Bandomų metu buvo matuojama alyvos temperatūra, alyvos slėgis ir rotoriaus greitis. Tyrimo rezultatai parodė, kad alyvos klampa ir temperatūra turi įtakos išcentrinio tepalo valytuvo rotoriaus greičiui, nes kai temperatūra yra 10 ℃, rotorius pasiekia greitį iki 1258 min-1 per 150 sekundžių, 1713 min-1, kai alyva temperatūra yra 20 ℃, 2156 min-1, kai alyvos temperatūra yra 30 ℃. Pavyzdžiui, kai temperatūra pakilo iki 70 ℃, rotoriaus sūkiai per minutę pasiekė 3962 ir 3994, kai alyvos temperatūra pasiekė 80 ℃. Visuose bandymuose laiko intervalai buvo vienodiThe paper represents the results of research on the influence of oil viscosity and temperature for acceleration speed of centrifugal oil filter‘s impeller. During the test oil temperature, oil pressure and rotor speed were measured. The research results showed that oil viscosity and temperature has influence for centrifugal oil filter‘s impeller‘s acceleration speed because when the temperature is 10 ℃ the rotor increase it’s speed to 1258 revolutions per minute in 150 seconds interval, 1713 revolutions per minute when oil temperature is 20 ℃, 2156 revolutions per minute, when oil temperature is 30 ℃. For example, when the temperature increased to 70 ℃, rotor’s revolutions per minute were measured 3962 and 3994 when oil temperature reached 80 ℃. In all of the tests time intervals were kept the sameVytauto Didžiojo universitetasŽemės ūkio akademij

    Naujokas iš traktorių elito

    No full text
    Vytauto Didžiojo universitetasŽemės ūkio akademij

    Comparison of tribological properties of sae 0W-40 and 5W-40 diesel engine oils

    No full text
    eISSN 2345-0371Nowadays friction reduction is of great importance due to fuel economy and energy saving issues. The internal combustion (IC) engine is widely used in rotation power production for moving machinery. The performance of internal combustion engine is closely related to its lubrication. Engine oil must ensure sufficient lubrication at all the lubrication regimes. Recently marketed lubrication oils possess different performance. However these differences are not always cost efficient. In those cases when cost is an issue some simple evaluation and comparison can be useful. The aim of current study is to compare tribological properties of two different diesel engine oils 0W-40 and 5W-40. Tribological test were performed using pin-on-disc and four-ball test schemes. The observed results show marginal difference between investigated lubrication oils. Their performances mostly differ at boundary lubrication regime where 0W-40 oil was superior to 5W-40. Moreover 0W-40 oil faster reaches transition boundary-to-mixed lubrication regime. However 5W-40 was considered to have better wear reduction abilityVytauto Didžiojo universitetasŽemės ūkio akademij

    Reinforcement of Electric Pulse Sprayed Coatings

    No full text
    Bibliogr.: p. 163 (5 pavad.)Vytauto Didžiojo universitetasŽemės ūkio akademij

    Effect of plastics creep on contact stiffness for wear tests

    No full text
    For tribological properties, the mechanical response to contact is particularly important if performance is to be understood. These model predictions have been tested experimentally using flat cylindrical indenter. During the loading steps of the indentation of elastoplastic materials, the total penetration depth (or deformation of pin) is the summation of the elastic and plastic depths. The plastic depth corresponds to the contact depth, which is used to determine the contact area, load-holding creep grow of plastics are different from metals, so deformations can significantly influent the estimated wear data. Due the dry wear tests with poliamide and poliacetalhomopolimer plastics wear value can be fogged by deformation level of sample. This paper describes an experimental study of contact compliance data for deriving polymer tribological propertiesVytauto Didžiojo universitetasŽemės ūkio akademij

    Investigation of Electropulse Sprayed Copper Alloy Coatings

    No full text
    Santr. liet. žrn. galeBibliogr.: p. 182 (14 pavad.)Vytauto Didžiojo universitetasŽemės ūkio akademij
    corecore