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The effect of SiO2 nanoparticles content in engine oil on tribological properties of valvetrain chain transmission components

Spinache Edward, Trandafir Adrian, Diaconu Mihai, Ozuna Gustavo, Wozniak Marek, Kubiak Przemyslaw, Siczek Krzysztof

Combustion Engines

2019

R. 58, nr 4

4--12

The drive from the crankshaft to the camshaft in an internal combustion engine is usually carried out by means of a cogged belt transmission or a chain transmission when high millage is required without service operations. The valvetrains in CI engines sometimes use the gear transmissions, and the historical rather bevel gear can be found in old cars of collectors or in some motorcycle engines. The chain gear used in SI engines has a two- or three-row chain with high strength, due the unevenness of loads that additionally induce chain pulling and valve timing deregulation. The chain transmission requires the use of pre-tensioners, usually self-acting and driven by springs or oil pressure. The vibrations and chain runout are limited using plastic guides placed on the outside of the long straight sections of the chain. The model of the chain transmission developed with the use of the Finite Elements Method, which operates under oil lubrication conditions, was analyzed. Such the model allowed obtaining weight and mass inertial moments of components. The aim of the study was to evaluate the effect of SiO2 nanoparticles content in engine oil on the friction between chain transmission components. The resulted values of the friction torque in the chain transmission operating in different conditions of lubrication have been presented in the paper.

Synthesis of SiO2 nanopowders containing quartz and cristobalite phases from silica sands

Munasir Z., Triwikantoro T., Zainuri M., Darminto D.

Materials Science Poland

2015

Vol. 33, No. 1

47--55

In this study, extraction and synthesis of SiO2 nanoparticles from silica sands have been conducted by means of two different methods, i.e. dry method (method 1) and hydrothermal process (method 2). The basic difference between the two methods is in the extraction step. The two methods were compared in terms of being more efficient, economical, and superior in obtaining SiO2 nanoparticles. The SiO2 nanoparticles were characterized in terms of phase purity, crystallinity, Si–O functional bonding as well as particles size and morphology. The most interesting fact in this study was the formation of both quartz and cristobalite phases within all prepared SiO2 nanoparticles.

Acrylic Pressure-Sensitive Adhesives Containing SiO2 Nanoparticles

Czech Z., Kowalczyk A., Ortyl J., Świderska J.

Polish Journal of Chemical Technology

2013

Vol. 15, nr 1

12-14

The use of acrylic pressure-sensitive adhesives (PSAs) is increasing in a variety of industrial fi elds. They have been applied in the manufacture of mounting tapes, self-adhesive labels, protective fi lms, mas king tapes, splicing tapes, carrier-free tapes, sign and marking fi lms, and in diverse medical products, such as pads or self-adhesive bioelectrodes. In this study, the application of SiO2 nanoparticles in acrylic PSA was investigated. The properties of the newly synthesized and modifi ed PSA were evaluated via the tack, peel adhesion, shear-strength and shrinkage. It has been found that the nanotechnologically-reinforced systems consisting of monodisperse non-agglomerated SiO2 nanoparticles and self-crosslinked acrylic PSAs showed a great enhancement in tack, peel adhesion, shear resistance and shrinkage, without showing the disadvantages known to result from the use of other inorganic additives. In this paper we evaluate the performance of SiO2 nanoparticles with a size of about 30 nm as inorganic fi ller into the synthesized solvent-borne acrylic PSA.