DIMENZIONIRANJE POLŽNEGA GONILA ZA POGON SLEDILNIKA SONCA

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Title:	DIMENZIONIRANJE POLŽNEGA GONILA ZA POGON SLEDILNIKA SONCA
Authors:	ID Šori, Marko (Author) ID Glodež, Srečko (Mentor) More about this mentor...
Files:	UNI_Sori_Marko_2011.pdf (2,41 MB) MD5: 10A0782D721D4DEEAC2045B741A8B281
Language:	Slovenian
Work type:	Undergraduate thesis
Organization:	FS - Faculty of Mechanical Engineering
Abstract:	V diplomskem delu je predstavljeno dimenzioniranje polžnega gonila za pogon sledilnika sonca. V uvodnem delu je predstavljen problem z materialom polžnika in zastavljeni so cilji diplomskega dela. Sledita dve poglavji o teoretičnih osnovah polžnih dvojic. Najprej so predstavljene določilne veličine polžaste dvojice in preračun sil, kasneje pa še trdnostni preračuni glede na različne kriterije. V nadaljevanju je zasnova in preizkušanje prvih polžastih dvojic, kjer je ugotovljeno da je obstoječa geometrija načeloma neprimerna zaradi upogiba gredi polža, vendar se da problem rešiti z nitriranjem polžnika. Ker je postopek nitriranja za podjetje predrag je v naslednjem poglavju predstavljena geometrijsko drugačna polžasta dvojica, ki ima večjo upogibno togost in manjše upogibne sile. V analizi rezultatov je prikazana razlika koeficientov varnosti, kjer je razvidno, da se kljub dvakratnemu povečanju koeficienta varnosti proti upogibu gredi polža ostali koeficienti varnosti niso bistveno spremenili. V zaključku je ugotovljeno, da standard DIN 3996 ne predvideva jekel za poboljšanje kot materiala za polžnike in da ne podaja spodnje omejitve za ubirni kot.
Keywords:	Polžaste dvojice, ozobljeni ležaji, pogon sledilnika sonca
Place of publishing:	Maribor
Publisher:	[M. Šori]
Year of publishing:	2011
PID:	20.500.12556/DKUM-19725
UDC:	621.833.38-11(043.2)
COBISS.SI-ID:	15447062
NUK URN:	URN:SI:UM:DK:CTFEX01H
Publication date in DKUM:	13.10.2011
Views:	3218
Downloads:	410
Metadata:
Categories:	KTFMB - FS
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Secondary language

Language:	English
Title:	DIMENSIONING OF WORM DRIVE FOR SUN TRACKERS
Abstract:	In this diploma paper the dimensioning of a worm drive for sun trackers is presented. In the introduction the problem of unusual material for a worm gear is shown and the goals of a diploma paper are set, followed by two theoretical chapters about worm gears, which include definitions and calculation methods for worm gear pairs with 90 degree shaft angle. Afterwards the first design of worm gear pair is presented with test results. There it is noted that nitriding is a suitable heat treatment for the worm gear and carburizing for the worm. Because the company claimed nitriding is too expensive, some geometry change was done, but it had to be within limits of existing housing. That meant axis distance and bearing locations should remain the same. Therefore only the pressure angle was reduced, the pitch circle of a worm was increased and the pitch circle of a worm gear was decreased. This change caused less deflection of a worm axis and therefore better running conditions, so nitrding is no longer needed. In the results section there is an absolute and a relative comparison of various safety coefficients for “old” and “new” geometry. There is also a comparison of deflection safety and root safety depended on pressure angle with other variables fixed. At the end it is determined that standard DIN 3996 does not contain information about certain factors if tempered steel is used as a worm gear material and there are also no limitations for pressure angle.
Keywords:	worm gear, toothed bearings, slew drive for sun trackers

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