The bearing area of the piston pin should be about

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Unformatted text preview: n Fig. 32.7 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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