Vpliv dolžine zapiranja grelca grelnih svečk za dizelske motorje na njegove karakteristike

Ivančič, Tadej (author), Majdič, Franc (mentor), Kek, Tomaž (comentor)

Nastavitev dolžine zapiranja grelca grelne svečke se v proizvodnji trenutno določa izkustveno, brez podatkov o njenem dejanskem vplivu na delovanje svečke. V okviru diplomske naloge smo zato obravnavali vpliv dolžine zapiranja grelca grelne svečke za dizelske motorje na njeno delovanje. Testirali smo pet dolžin zapiranja (5, 8, 11, 14 in 17 mm) na 150 grelcih. Analizirali smo dimenzije, upornost in žarilne lastnosti pred in po nadaljnji proizvodni obdelavi. Z rentgensko analizo smo preverili notranjo zgradbo izbranih vzorcev. Rezultati kažejo, da dolžina zapiranja opazno vpliva na dolžino grelca in na njegove žarilne karakteristike. Nastavitvi 14 mm in 17 mm izstopata kot najprimernejši za uporabo v proizvodnji – 14 mm je dimenzijsko najbolj stabilna, 17 mm pa funkcionalno najbolj stabilna. Rentgenska analiza je pokazala, da razlike v žarilnih karakteristikah grelca večinoma povzroča dolžina navitja grelnega upora.

• Language: Slovenian
• Keywords: rotacijsko kovanje, grelne svečke, hladno preoblikovanje, dolžina zapiranja, grelni upori
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2026
• PID: 20.500.12556/RUL-189618
• Publication date in RUL: 10.10.2026

Secondary language

• Language: English
• Title: The influence of glow plug heating element closing length on its characteristics

Abstract

The closing length of the glow plug heating element is currently determined empirically in production, without data on its actual effect on glow plug performance. As part of this thesis, we therefore investigated the effect of the closing length of the heating element tube glow plug performance for diesel engines. We tested five closing lengths (5, 8, 11, 14 and 17 mm) on 150 heating elements. We analysed dimensions, resistance, and glow characteristics before and after further production processing. X-ray analysis was used to verify the internal structure of selected samples. The results show that the closing length has a noticeable effect on the length of the heating element and on its glow characteristics. The 14 mm and 17 mm settings stand out as the most suitable for use in production - the 14 mm setting is the most dimensionally stable, while the 17 mm setting is the most functionally stable. X-ray analysis showed that differences in glow characteristics are mostly caused by the length of the heating resistor winding.

• Keywords: rotary swaging, glow plug, cold forming, closing length, heating resistor