Proceedings of SerbiaTrib '13

Serbian TribologySocietySERBIIATRIB ‘1313 th International Conference onTribologyKragujevac,Serbia, 15 – 17 May 2013Faculty of Engineeringin KragujevacANALYZING THEINFLUENCE OF THECONSTRUCTIONELEMENTPOSITION ONTORQUE TRANSMISSIONBYFRICTIONMarija Jeremić 1 , Bojan Bogdanović 1 , Aleksandar Simićć 1 , Dragomirr Miljanić 2Petar Todorović 1 , Sasa Randjelovic 1 , Branko Tadić 11 Faculty ofEngineering, Sestre Janjić 6, Kragujevac, Serbia, mjeremic88@yahoo.com, bogdanovicboki@@gmail.com,aleksandarsimickg88@gmail.com, petar@ @kg.ac.rs, sasarandjelovic@@yahoo.com, tadic@kg.ac. rs2 Metalik, Nikšić, MontenegroAbstract: This paper is analysing the impact of the construction element position of ship winch drum on the effects oftorque transmission by friction in the mechanization welding process. The driving and driven n wheels (constructionelements) were examined for the general case of the load distribution. Based on this examination, the construction ofthe device that should provide the reliable torque transmission andthe movement of the drumm in the process of itswelding is proposed. This construction is characterized by a high level of flexibility and ability to change the frictiontorque basedon changing drum positionin regard too the driving and driven wheels (construction elements) s). With thisnew construction, problems related to the movement synchronization are avoided, unlike the all previouslyy knownconstructionss of this type, which lead tothe positive impact on the wear intensityy of friction gears.Keywords: friction, wear, transfer off torque, special device, marine winch drum1. INTRODUCTIONResearchdescribed in the paper is related too theproblems of friction torque transmission. Researchis applicative and connected with design of bootdevice (reversal) drum ship winchess during weldingprocess. Torque transmission is performed byfriction tribological contact with rubber and metal.Movement can be reached by using only the effectsof friction, but frictionduring movement alwaysbrings different types of losses. Connected withthis, knowledge of the value off coefficientt offriction is very important for every engineer anddesignerwho is involvedindesign anddevelopment of mechanical structures, whichperform their function through interaction ofsurfaces which move relatively. It is well knownthat the process of friction followss every kindd ofbody movement. Friction is a necessary processbecause only with effects of friction f can beachieved starting, moving, changing speed orstopping. On the other hand, during movement, as aconsequence of frictional resistance, that resistancemust be overcome in order to continue movement,which is why the energylosses exist. In addition to13 th International Conference on Tribology – Serbiatrib’13energy loss, friction is always accompanied withwear of material on contact surfaces, whichhproducesan additional costs andloss offunctionality off elements in n contact.Friction is, therefore, such a process which, atthe same time, manifests positive and negativeeeffects. It is therefore natural that there is atendency to eliminate its negative effects, or at leastminimize, and to t increase the positive [ 1]. A reviewof the knowledge of the friction force, as well asways for measurement aree presented by Peter J.Blau [2], he presented some of the most commonstandards-defined measuring methods for f static anddynamic friction coefficient, and its potential uses.Beginning of movement m of any kind is related tothe existence of static friction. Static coefficient offriction depends of manyy parameters, especiallyfromthe surface of contact, normal load, andtemperature off the atmosphere in which contacttoccurs, surface absorption, quality of contacttsurface materials [3-7]. Analyzing the rollingprocess [8] inn the absence of anyload, theconclusion is that t the energy losses are result ofcollisions of two moving rolling mass, i.e. mass ofrolling body with w the body on whose surface is341