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Unformatted text preview: nkshaft is subjected to maximum bending moment and secondly when the crankshaft is subjected to maximum
twisting moment or torque.
2. The additional moment due to weight of flywheel, belt tension and other forces must be considered.
3. It is assumed that the effect of bending moment does not exceed two bearings between which a force is
considered. 32.20 Design of Centre Crankshaft
We shall design the centre crankshaft by considering the two crank possitions, i.e. when the
crank is at dead centre (or when the crankshaft is subjected to maximum bending moment) and when
the crank is at angle at which the twisting moment is maximum. These two cases are discussed in
detail as below :
1. When the crank is at dead centre. At this position of the crank, the maximum gas pressure on
the piston will transmit maximum force on the crankpin in the plane of the crank causing only bending
of the shaft. The crankpin as well as ends of the crankshaft will be only subjected to bending moment.
Thus, when the crank is at the dead centre, th...
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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