Analiza deformabilnosti zoba polimernega zobnika

Mlinarič, Tilen (author), Brojan, Miha (mentor)

Mnogo strojev na svetu vsebuje zobnike, ki so v veliki večini narejeni iz jekla. Dandanes se na trg široke potrošnje prebijajo zobniki iz polimernih materialov, ki pa imajo svoje prednosti in slabosti. Z zobniki prenašamo moment preko majhne stične ploskve med dvema zoboma. Pri prenašanju obremenitve pride do raznih pojavov, npr. elastične deformacije zoba, generacije toplote in spremembe geometrije. V kolikšni meri bo prišlo do pojavov, je močno odvisno od geometrije in materiala zobnika. Zanimalo nas je, do kakšnih deformacij pride in kakšna je razporeditev napetosti. Deformacijo smo preračunali po deformacijski teoriji, ki velja za malo deformirane nosilce. Eksperimente smo izvedli na dveh enakih zobnikih iz prosojnega polimernega materiala, ki nam je omogočil uporabo metode fotoelastičnosti. Zaradi relativno velikih upogibov in s tem povesa smo ugotovili, da teorija deformacij majhnih pomikov ni najboljša izbira. Za dobre meritve povesa je potrebno imeti ostro sliko in razločno viden rob, da se zmanjša doprinos napake zaradi subjektivne narave merjenja dolžine v programu. Porazdelitev napetosti po zobu nam da vpogled v najbolj obremenjena področja zoba in pokaže, da se pojavi največja napetost v stični točki.

• Language: Slovenian
• Keywords: evolventni zobniki, polimerni zobniki, deformabilnost zob, eksperimenti, fotoelastičnost
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Publisher: [T. Mlinarič]
• Year: 2018
• PID: 20.500.12556/RUL-103053
• UDC: 621.8+539.3(043.2)
• COBISS.SI-ID: 16420635
• Publication date in RUL: 13.09.2018

MLINARIČ, Tilen, 2018, Analiza deformabilnosti zoba polimernega zobnika [online]. Bachelor’s thesis. T. Mlinarič. [Accessed 23 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=103053

Secondary language

• Language: English
• Title: Analysis of the deformable tooth of a polymer gear

Abstract

Many machines in the world comprise gears, mostly made from steel. Nowadays, the share of polymeric gears is increasing rapidly. Such gears have several advantages and disadvantages. With gears, we transmit torque through small contact surfaces between two teeth. When carrying the load, various phenomena occur, e.g. elastic deformation of the tooth, heat generation and changes in geometry. The extent to which these phenomena occur heavily depends on the geometry and the gear material. In this work, we focus on deformation and the stress distribution. The deformation was calculated using the small deformation theory. Experiments were carried out on two identical gears made of transparent polymeric material, which allowed us to use photoelasticity. Due to the relatively large deflections, we have found out that the theory of small deformation was not the best choice. For good measurements of deflection, a sharp image and a clearly visible edge are necessary to reduce the error due to the subjective nature of the length measurement in the software. The tooth stress distribution gives us an overview of the most critical points in the tooth and shows that the maximum stress occurs in the point of contact.

• Keywords: involute gears, polymer gears, teeth deformability, experiments, photoelasticity