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The connecting rod is the intermediate member between the piston and the crankshaft. Its primary
function is to transmit the push and pull from the piston pin to the crankpin and thus convert the
reciprocating motion of the piston into the rotary motion of the crank. The usual form of the connecting
rod in internal combustion engines is shown in Fig. 32.9. It consists of a long shank, a small end and a
big end. The cross-section of the shank may be rectangular, circular, tubular, I-section or H-section.
Generally circular section is used for low speed engines while I-section is preferred for high speed engines. Fig. 32.9. Connecting rod. The *length of the connecting rod ( l ) depends upon the ratio of l / r, where r is the radius of
crank. It may be noted that the smaller length will decrease the ratio l / r. This increases the angularity
of the connecting rod which increases the side thrust of the piston against the cylinder liner which in
turn increases the wear of the liner. The larger length...
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- Spring '11