We know that maximum gas force d2 i p 4 where d

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Unformatted text preview: taken as 10.5 N/mm2 to 15 N/mm2. Since the maximum load to be carried by the crankpin and piston pin bearings is the maximum force in the connecting rod (FC), therefore the dimensions for these two pins are determined for the maximum force in the connecting rod (FC) which is taken equal to the maximum force on the piston due to gas pressure (FL) neglecting the inertia forces. We know that maximum gas force, π D2 ...(i) ×p 4 where D = Cylinder bore or piston diameter in mm, and p = Maximum gas pressure in N/mm2 Now the dimensions of the crankpin and piston pin are determined as discussed below : Let dc = Diameter of the crank pin in mm, lc = Length of the crank pin in mm, pbc = Allowable bearing pressure in N/mm2, and dp, lp and pbp = Corresponding values for the piston pin, We know that load on the crank pin = Projected area × Bearing pressure = dc . lc . pbc ...(ii) Similarly, load on the piston pin = dp . lp . pbp ...(iii) FL = 1154 n A Textbook of Machine Design Equating equation (i) and (ii), we have FL = dc · lc · pbc Taking lc = 1.25 dc to 1.5 dc, the value of dc and lc are determined from the above expres...
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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.

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