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Unformatted text preview: hen the piston gas load at this position
FP = × D 2 × p '
and thrust on the connecting rod,
FQ = cos φ
φ = Angle of inclination of the connecting rod with the line of stroke
The *thrust in the connecting rod (FQ) may be divided into two components, one perpendicular
to the crank and the other along the crank. The component of FQ perpendicular to the crank is the
tangential force (FT) and the component of FQ along the crank is the radial force (FR) which produces
thrust on the crankshaft bearings. From Fig. 32.17 (b), we find that Fig. 32.17. (a) Crank at an angle of maximum twisting moment. (b) Forces acting on the crank. FT = FQ sin ( θ + φ )
FR = FQ cos ( θ + φ )
It may be noted that the tangential force will cause twisting of the crankpin and shaft while the
radial force will cause bending of the shaft.
and * For further details, see Author’s popular book on ‘Theory of Machines’. Internal Combustion Engine Parts n 1167 Due to the tangential force (FT), 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