Annals of the University of Petroşani, Mechanical Engineering, 14 (2012), 164-170 164 STUDY THE POSSIBILITY OF LUBRICATION FOR ROLLING BEARINGS GABRIEL PRAPORGESCU 1 , SORIN MIHĂILESCU 2 Abstract: In this paper are presented some methods of lubrication and calculating the volume of lubricant required by joints of friction, supply methods and filtering it. Key-words: lubrication, rolling bearings, joints of friction 1. INTRODUCTION This paper presents some possibilities regarding the methods of lubrication the friction joints, type rolling bearings, calculating the necessary lubricant volume required and it’s filtering. The lubricant generally performs three main functions, namely [3]: - to form a continuous film between the friction surfaces; - to dissipate heat accumulated at the contact surfaces; - to prevent the entry of dust and other particles (contaminants) in the contact area. 2. ESTABLISHING THE NECESSARY LUBRICANT FLOW Lubricant flow regime necessary to ensure the functioning of a hydrodynamic thrust bearing can be determined by existing methodologies in the literature. Bearing lubrication hole must be constantly supplied with enough oil to ensure film formation between the surfaces and the temperature must be maintained in satisfying limits. The necessary volume of lubricant film in order to achieve an elasto- hydrodynamic lubrication condition is extremely small. In almost all cases, some of the fluid adheres to each of the two surfaces of the friction joints, and another part passes repeatedly through the contact zone, an additional flow is determined only by the 1 Assoc Prof. Eng.PhD. at University of Petroşani, gpraporgescu@gmail.com 2 Assoc Prof. Eng.PhD. at University of Petroşani, mihailescus@gmail.com