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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
fuel-air mix Rotor
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
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.
- Spring '11