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Vplivni parametri na delovanje orbitalnega hidravličnega motorja na vodo
ID Strmčnik, Ervin (Author), ID Majdič, Franc (Mentor) More about this mentor... This link opens in a new window, ID Kalin, Mitjan (Co-mentor)

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Abstract
Doktorsko delo obravnava vplivne parametre na delovanje orbitalnega hidravličnega motorja, katerega glavna funkcija je pretvorba hidravlične energije v mehansko delo. Kot merilo za oceno učinkovitosti pretvorbe energije smo izbrali skupni izkoristek hidravličnega motorja, ki je odvisen od volumetričnega in mehansko-hidravličnega izkoristka. Ker smo pri raziskavah uporabili dva različna delovna medija, smo razvili in izdelali oljno in vodnohidravlično preizkuševališče. Raziskovalno delo je razdeljeno na dva sklopa. V prvem sklopu smo s spremembo konstrukcije hidravličnega motorja skušali zmanjšati notranje puščanje in na ta način povečati volumetrični izkoristek. V drugem sklopu smo se posvetili kontaktnemu inženiringu in izboljšanju triboloških razmer, kar je vplivalo na povečanje mehansko-hidravličnega izkoristka. Rezultati kažejo, da imajo konstrukcijski parametri zelo pomemben vpliv na delovanje hidravličnega motorja, saj lahko sprememba velikosti izvrtin v ventilski plošči hidravličnega motorja vodi v 5\,\% povečanje skupnega izkoristka. Na osnovi bazičnih hidravličnih testov je bilo dokazano, da uvedba labirintnih tesnil v smislu izdelave utorov pripomore k manjšemu notranjemu puščanju. Pri triboloških raziskavah smo analizirali vpliv površinske hrapavosti, površinske trdote, maziva, pritisne sile na trenje, volumen obrabe in koeficient obrabe v dveh različnih kontaktih (1) jeklo/jeklo in (2) DLC/jeklo. Zelo ugodne tribološke lastnosti so bile dokazane v kontaktu DLC/jeklo v vodi, kar se je odražalo v nizkem trenju in majhni obrabi. Rezultati triboloških testov so predstavljali izhodišče in motivacijo za testiranje realnega hidravličnega motorja z DLC prevleko na rotorjevem obroču. Največji skupni izkoristek modificiranega hidravličnega motorja v vodi je bil 23\,\%. Rezultati dokazujejo, da kombinacija jekla, DLC prevleke in vode kot hidravlične kapljevine predstavlja obetavno rešitev za okoljsko občutljive aplikacije, kjer se olja skuša nadomestiti z vodo.

Language:Slovenian
Keywords:hidravlični motorji, izkoristek, inženiring površin, tribologija, vodna hidravlika, DLC prevleke, Gerotorji.
Work type:Doctoral dissertation (mb31)
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Publisher:[E. Strmčnik]
Number of pages:XXVIII, 134 str.
PID:20.500.12556/RUL-113710 This link opens in a new window
UDC:621.22:539.92(043.3)
COBISS.SI-ID:303836928 This link opens in a new window
Publication date in RUL:29.01.2020
Views:863
Downloads:249
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Secondary language

Language:English
Title:Influential parameters on operating of water orbital hydraulic motor
Abstract:
In this PhD thesis we studied the influential parameters with respect to the operation of an orbital hydraulic motor, the main function of which is the conversion of hydraulic energy into mechanical work. The total efficiency, which depends on the volumetric and hydraulic-mechanical efficiency, was selected as the main criterion for the above-mentioned conversion of energy. Oil and water test rigs were developed and built for the two different working fluids. Research activities were split into two parts. In the first part, we tried to change the design parameters and reduce the internal leakage, which would lead to an increase of the volumetric efficiency of the hydraulic motor. In the second part, we focused on the contact engineering and tribological improvements, which could lead to better hydraulic-mechanical characteristics. The result shows that the design parameters of the hydraulic motor play a very important role. The total efficiency increased up to 5\,\% when the hole size in the valve plate was changed. The result of a basic hydraulic test shows that the labyrinth sealing with the corresponding annular grooves can significantly reduce the internal leakage. Within the tribological tests we investigated the influence of surface roughness, surface hardness, load, and lubricant on the coefficient of friction, wear loss and wear coefficient in two contacts, i.e., (1) steel/steel and (2) DLC/steel. Considering the coefficient of friction and the wear loss, very promising tribological behaviour was observed for the SS/DLC in water. The result of the tribological test gave us the motivation for further investigations related to the DLC coating, deployed on the outer floating ring of the hydraulic motor. The maximum total efficiency of the modified hydraulic motor was 23\,\%. A combination of DLC, steel and water represents a promising solution for environmental sensitive applications, where oil should be replaced by water.

Keywords:hydraulic motors, efficiency, surface engineering, tribology, water hydraulics, DLC coatings, Gerotors

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