20200422231953PM-93063944-2001339-1713229909 (3) - Lubrication Friction and wear in Automobile Engine PUT YOUR STUDENT NUMBER HERE School of

20200422231953PM-93063944-2001339-1713229909 (3) -...

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Lubrication, Friction, and wear in Automobile Engine PUT YOUR STUDENT NUMBER HERE School of Engineering, University of Central Lancashire,Preston PR1 2HE, UK ABSTRACT Automotive lubrication systems are primarily used to collect, clean, cool, as well as recirculation of oil from vehicle engines. The main function of the automotive lubrication system is to supply oil circulating through all the moving parts of the engine in order to reduce friction between surfaces that touch each other. Friction refers to the force that arises when two (usually solid) bodies in contact tend to move relative to each other, either linearly or other curvilinear manner. Keywords: lubrication, reliability, efficiency, friction, as well as wear. Keywords: lubrication, Reliability, Efficiency, friction, wear. 1. INTRODUCTION The automobile lubrication system reduces the wear of the engine due to friction of the metal parts as well as allows heat to escape. Engine parts requiring continuous lubrication are cylinder pistons as well as piston rings, main bearings, crank shafts, crank pins as well as piston pins, connecting rods, camshafts, valves, as well as timing gears. The purposes of the lubrication system are: – a) To reduce friction between movable parts b) For efficiency c) To minimize vibration d) To reduce corrosion as well as carbon deposits e) Reduce heat of moving parts f) Minimizing power loss due to friction g) Reduce noise generated by moving parts h) Cooling the engine Friction is caused by cohesion between the surface particles, adhesion between the surface particles and / or surface mechanical micro –obstructions due to surface roughnesses. When there is attempted motion, then there is no friction. The magnitude of the friction force is a function of the contact force between the two surfaces and the physical properties of the two contact surfaces. Friction may act linearly when the attempted relative motion is linear such as when a flat block is slid linearly on a flat table or it may act as a frictional torque (turning force) when a shaft rotates inside a hole (Daoud and Abou El-khair, 2010). When the pull, P, is applied in a gradually increasing manner from zero, it will be observed that initially, the block resists motion, that is, it doesn’t move, meaning that there is a force resisting motion; this is the friction force. As the force is increased further, a point comes when the block starts to move. The block under a pull, P, will tend to move (slide) towards the right hand side hence a frictional force, F, is set up in opposition to the pull, P. It acts in opposite direction to P or in opposite direction to the likely direction of motion (which is in the same direction as the pulling force, P) (Daoud and Abou El-khair, 2010). PUT YOUR STUDENT NUMBER IN THE FOOTER HERE ON EVERY PAGE2019-20 Advanced Tribology Design and Reliability of Machine Elements 1
Static friction refers to the friction force set up between the two contacting surfaces prior to the

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