Friction forces and friction coefficient in slide parabolic micro-bearing with consideration of the adhesion force

• Autorzy: Miszczyk Miszczak, A. , Czaban A.
• Języki publikacji: EN

Abstrakty

EN

Micro-bearings have many applications in computer devices, such as CPU fans or hard disc drives. So far, rolling bearings and slide bearings have been used,for example micro-bearing with smooth Journal and sleeve surface, which is known as FDB - Fluid Dynamic Bearing. Actually, latter versions of micro-bearings are being launched to the market: Ex-FDB - Extra Fluid Dynamic Bearing. This type of bearings was fabricated by putting some micro-grooves filled with oil on its interna! surfaces. Ex-FDB's are characterized by reduced level of generated noise and guarantee long failure-free fan life, reaching 120 000 hours. In this paper we present our numerical calculations of the friction force and the friction coefficient in the parabolic micro-bearing. Micro-bearing gap height is very low, often less then l micrometer, therefore capillarity and adhesion forces cause an increase of oil viscosity near the Journal and sleeve surfaces. Due to this fact a value of hydrodynamic pressure in micro-bearing gap also increases, what results in observed changes of capacity, friction forces and friction coefficient values. The influence of adhesion and capillarity on friction force and friction coefficient of oil in micro-bearing hasn't been considered from analytical point of view so far. This paper presents numerical results of computed values of friction forces and friction coefficient for parabolic micro-bearing in comparison to values for classical parabolic bearing.

Słowa kluczowe

EN

adsorption; adhesion; capillary forces; micro-bearing lubrication

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 3
• Strony: 293--299
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Miszczyk Miszczak, A.

autor

Czaban A.

• Maritime University Gdynia, Faculty of Marinę Engineering Morska Street 83, 81 225 Gdynia, Poland tel: [phone], fax: [phone],

Bibliografia

• [1] Eui-Sung Yoon, Seung Ho Yang, Hung-Gu Han, Hosung Kong, An experimental study on the adhesion at a nano-contact, Wear, 254, pp. 974-980, 2003.
• [2] Jang, G. H., Lee, S. H., Kim, H. W., Kim, C. S., Dynamic analysis of a HDD spindle system with FDBs due to the bearing width and asymmetric grooves of journal bearing. Microsystems Technologies, 11, pp. 499-505, 2005.
• [3] Kogut, L., Etsion, I., Adhesion in elastic-plastic spherical microcontact, Journal of Colloid and Interface Science, 261, pp. 372-378, 2003.
• [4] Manabu Takeuchi, Adhesion Forces of Charged Particles, Chemical Engineering Science, 61, pp. 2279-2289, 2006.
• [5] Miranda, J. A., Oliveira, R. M., Adhesion phenomena in ferrofluids, Physical Review E, 70, pp. 1-11, 2004.
• [6] Rymuza, Z., Kusznierewicz, Z., Solarski, T., Kwacz, M., Chizhik, S., Goldade, A. V., Static ftriction and adhesion in polimer-polymer micro-bearings, Wear, 238, pp. 56-69, 2000.
• [7] Taylor, C. J., Dieker, L. E., Miller, K. T., Koh, C. A., Dendy, S. E., Micromechanical adhesion force measurements between tetrahydrofuran hydrate particles, Journal of Colloid and Interface Science, 306, pp. 255-261, 2007.
• [8] Wierzcholski, K., Miszczak, A., A study on the adhesion at a micro and nano lubrication, Journal of Kones Powertrain and Transport, Vol. 16, No. 4, pp. 499-506, Warsaw 2009.
• [9] Wierzcholski, K., Miszczak, A., Adhesion and capilarity in micro- bearing lubrication, Journal of Kones Powertrain and Transport, Vol. 16, No. 3, pp. 497-504, Warsaw 2009.
• [10]Wierzcholski, K., Adhesion and cohesion forces occurring in parabolical microbearing, Tribologia, 5 (227), pp. 221-228, 2009.
• [11]Wierzcholski, K., Adhesion influences on the pressure and carrying capacity of cylindrical microbearing, Tribologia, 5 (227), pp. 229-236, 2009.
• [12] Zhou, H., Goetzinger, M., Peukert, W., The influence of particle charge and roughness on particle-substrate adhesion, Powder Technology, 135-136, pp. 82-91, 2003.