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The piston pin should be designed for the maximum gas load or the inertia force of the piston,
whichever is larger. The bearing area of the piston pin should be about equally divided between the
piston pin bosses and the connecting rod bushing. Thus, the length of the pin in the connecting rod
bushing will be about 0.45 of the cylinder bore or piston diameter (D), allowing for the end clearance
* The mean diameter of the piston bosses is made 1.4 d0 for cast iron pistons and 1.5 d0 for aluminium
pistons, where d0 is the outside diameter of the piston pin. The piston bosses are usually tapered, increasing
the diameter towards the piston wall. Internal Combustion Engine Parts n 1139 of the pin etc. The outside diameter of the piston pin (d0 ) is determined by equating the load on the
piston due to gas pressure (p) and the load on the piston pin due to bearing pressure ( pb1 ) at the small
end of the connecting rod bushing. (a) Piston pin secured to the small
end of the connecting rod. (b) Piston pin secured to the boss
of the piston. Fig. 32.7. Semi-floating type piston pin. Let d0 = Outside dia...
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- Spring '11