Četverostupnjevani mjenjač manevarske dizelmehaničke lokomotive

Šajfar, Ante (2016) Četverostupnjevani mjenjač manevarske dizelmehaničke lokomotive. = Four speed gearbox of the maneuvering diesel-mechanical locomotive. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Kostelac, Milan.

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Abstract (Croatian)

Ovim radom prikazano je projektiranje je i konstruiranje četverostupnjevanog mjenjača koji preko kardanskog vratila pogoni osovinski međuprijenosnik za manevarsku dizelmehaničku lokomotivu oznake C. Prvi korak projektiranja je proračun vučne sile lokomotive tj. određivanje prijenosnih omjera mjenjača. S poznatim prijenosnim omjerima mjenjača pristupa se određivanju modula zupčanika te njihovo dimenzioniranje. Ovisno o materijalu zupčanika vrši se provjera čvrstoće obzirom na savijanje u korijenu ili na površinski (Hertzov) pritisak na boku zuba. Za promjenu stupnjeva prijenosa koriste se hidrauličke spojke proizvođača Stromag Una odabrane obzirom na moment vrtnje motora te prijenosne omjere pojedinih stupnjeva prijenosa. Iz konstrukcijskih razloga po dvije spojke smještene su na svako vratilo kroz koje se vrši dobava ulja te su dosjednim vijcima spojene na zupčanike. S poznatim dimenzijama i masama zupčanika i spojki određuju se reakcije u osloncima vratila, njihovo dimenzioniranje te kontrola kritičnih presjeka. Nakon odabira ležajeva slijedi konstrukcija kućišta koje je napravljeno iz dva dijela u lijevanoj izvedbi. Zbog velikih razlika u dimenzijama zupčanika kućište je izvedeno kaskadno. Kako ne bi bio potreban poseban sustav hlađenja, kućište je izvedeno s rebrima po oplošju s ciljem povećanja rashladne površine. Kućište je oslonjeno na šest mjesta, ima tri inspekcijska otvora, odzračnik te četiri mjesta za prihvat prilikom transporta i montaže. Mjenjač je s pogonskim motorom i osovinskim međuprijenosnikom spojen preko prirubnica i kardanskih vratila.

Abstract

This diploma thesis is about design and construction of a four-speed transmission to drive the intermediate transmission shaft for shunting diesel-mechanical locomotive of C class via PTO shaft. The first step in designing is to calculate tractive force of the locomotive, i.e. to determine gear ratios. Once the gear ratio is established, gear module and their dimensioning are then determined. Depending on the gear material, the next step is to test the strength in respect of the bending stress in the root or the Hertzian contact stress to the side of the gear tooth. Hydraulic clutches made by Stromag Una are used for gear changes. They are selected considering the engine torque and individual gear ratios. For the construction reasons, two clutches are placed on every shaft trough which oil distribution is made. Hydraulic clutches are connected to gears with fitted bolts. With the specified dimensions and mass of the gears and clutches, the next step is determination of reactions in the shaft pins, their dimensioning and control of critical cross-section. After selection of bearings, there is the construction of the housing which is made of two parts in the casting process. Due to significant variations in gear dimensions, the cascade model is used for the housing. In order to avoid special cooling system, fins are attached to the housing to increase the cooling area. The gearbox housing has six supporting spots, three inspection ports and a vent. It also has four attachment points for easier transport and assembling. The gearbox is attached to the engine and intermediate transmission shaft via flanges and PTO shafts.

Item Type:	Thesis (Master's thesis (Bologna))
Uncontrolled Keywords:	lokomotiva;mjenjač;prijenosnik snage;zupčanici
Keywords (Croatian):	locomotive;gearbox;power transmission;gears
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	400 Department of IC Engines and Mechanical Handling Equipment > 430 Chair of Track-guided Rail and Levitated Vehicles
Date Deposited:	06 Jul 2016 09:44
Last Modified:	06 Jul 2016 09:44
URI:	http://repozitorij.fsb.hr/id/eprint/6154

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