21. Some friction knots improvements in agricultural machinery
Kaunas University of Technology, Kęstučio str. 27, LT-44312 Kaunas, Lithuania
(Received 2 September 2013; accepted 7 September 2013)
Abstract. This article contains the material on the research of polyamide slide bearings aiming to use them wider in agricultural machinery. The brief analysis of polymeric materials is provided in order to find out which of them is more suitable for the production of sliding bearings. The laboratory injection molding machine of the polyamide slide bearings was designed and manufactured by pressure to carry out the research, also a stand for slide bearings laboratory testing and other equipment were produced. They are not included in this article. After some bearings laboratory tests, they were tested under operating conditions. Detailed tests were carried out determining the smallest space in the slip knot between the inner bearing diameter and the shaft. The observed phenomenon that after inserting the bushing into its housing, within a period of 72 hours, the inner diameter decreases and stabilizes was taken into account. The long-term bearings research was carried out in aggressive environments (dust, water, oil). As a result, conclusions can be drawn about the wider usage of them in agricultural machiney. The long-term bearings research in grass harvesting machinery was carried out (duration 6 months) in order to investigate the appropriateness of the choice of materials for the production of bearings, as well as the lubrication regime and their operational reliability. While performing operating tests after treating the material, recommendations for a wider use of polymeric bearings, which are presented at the end of the article, were prepared.
Keywords: bearings, slide bearings, polymeric slide bearings, slide bearings for agricultural machinery.
 Stonys J. Agricultural Machinery and Tractors Knots Operational Reliability Improvement Using Polyamide Slide Bearings which were Affected by Electromagnetic Field when Casting. Part I. Equipment Construction. Dissertation Material, Smalininkai, Lithuania, 1996‑2001, p. 435.
 Stonys J. Agricultural Machinery and Tractors Knots Operational Reliability Improvement Using Polyamide Slide Bearings which were Affected by Electromagnetic Field when Casting. Part II. Non-Magnetic Polyamide Slide Bearings Operating Tests. Dissertation Material, Smalininkai, Lithuania, 1998‑2006, p. 473.
 Venediktov N. L. Plastics: Properties, Processing Techniques, Intended Use. Scientific Help, Tiumen, Russia, 2001.
 Garbara M. I., et al. Plastics Help. Chemistry, Leningrad, Russia, 1967.
 Kargina V. A., Kabanova V. A. Encyclopedia of Polymer. Moscow, Russia, Vol. I, 1972, Vol. II, 1974, Vol. III, 1977.
 Lachtin J. M., Leontjeva V. P. Materials: Textbook for Higher Education. Machinery Constructor, Moscow, Russia, 1990.
 Crompton C. R. Characterization of Polymers. ChemTec Publishing, Vol. 1 and Vol. 2, 2009.
 Anurjev V. I. Machinery Constructor Help. Machinery Constructor, Moscow, Russia, Vol. I, 2001, p. 920.
 Anurjev V. I. Machinery Constructor Help. Machinery Constructor, Moscow, Russia, Vol. II, 2001, p. 901.
 Anurjev V. I. Machinery Constructor Help. Machinery Constructor, Moscow, Russia, Vol. III, 2001, p. 859.
 Žitňanskýn J., Žarnovský J., Mikuš R., Kováč I., Andrássyová R. Material Machining for Friction Knots of Moving Parts for Agricultural Machines. Slovak University of Agriculture in Nitra, Faculty of Engineering, Slovak Republic, 2011.
 Sorokatij R. V., Rodionenko A. V. Modeling slide bearings wearing processes. Problems of Tribology, Moscow, Russia, Vol. 3, 2010, p. 76‑81.
 Increasing Reliability of Bearing Units of Agricultural Machinery. Engineering for Rural Development, Primorsky State Agricultural Academy, Russia, 2012.
 Inshakov S. V., Ishchenko A. A., Balabanov V. I., et al. Improvement of the lubricants quality. Machinery in Agriculture, Russia, Vol. 4, 2011, p. 24‑28.
Cite this article
Justinas Stonys Some friction knots improvements in agricultural machinery. Journal of Measurements in Engineering, Vol. 1, Issue 3, 2013, p. 137‑142.
Journal of Measurements in
Engineering. September 2013, Volume 1, Issue 3