Force due to friction of the piston pin bearing and

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Unformatted text preview: the connecting rod are as follows : 1. Force on the piston due to gas pressure and inertia of the reciprocating parts, 2. Force due to inertia of the connecting rod or inertia bending forces, 3. Force due to friction of the piston rings and of the piston, and 4. Force due to friction of the piston pin bearing and the crankpin bearing. We shall now derive the expressions for the forces acting on a vertical engine, as discussed below. 1. Force on the piston due to gas pressure and inertia of reciprocating parts Consider a connecting rod PC as shown in Fig. 32.10. Fig. 32.10. Forces on the connecting rod. 1146 n A Textbook of Machine Design Spark plug Compressed fuel-air mix Rotor Fuel-air mix in 1. Induction : turning rotor sucks in mixture of petrol and air. Let 2. Compression: Fuel-air mixture is compressed as rotor carriers it round. Exhaust out 3. Ignition: Compressed 4. Exhuast : the rotor fuel-air mixture is ignited continues to turn and by the spark plug. pushed out waste gases. p = Maximum pressure of gas, D = Diameter of piston, A = Cross-section area of piston = mR = Mass of reciprocating parts, π D2 , 4 = Mass of piston, gudgeon pin etc. + 1 rd mass of connecting rod, 3 ω = Angular speed of crank,...
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.

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