# Of crank pin or big end bearing 2 thickness of

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Unformatted text preview: /mm2 ...(Given) The big end cap is designed as a beam freely supported at the cap bolt centres and loaded by the inertia force at the top dead centre on the exhaust stroke (i.e. FI when θ = 0). Since the load is assumed to act in between the uniformly distributed load and the centrally concentrated load, therefore, maximum bending moment is taken as F ×x MC = I 6 1160 n A Textbook of Machine Design where x = Distance between the bolt centres = Dia. of crank pin or big end bearing + 2 × Thickness of bearing liner + Nominal dia. of bolt + Clearance = (dc + 2 × 3 + db + 3) mm = 44 + 6 + 12 + 3 = 65 mm ∴ Maximum bending moment acting on the cap, FI × x 9490 × 65 = = 102 810 N-mm 6 6 MC = Section modulus for the cap ZC = 5 8( t c ) 2 bc ( t c ) 2 = = 9 .7 ( t c ) 2 6 6 We know that bending stress ( σb ), 80 = ∴ MC 102 810 10 600 = = ZC 9.7 (tc ) 2 (tc ) 2 (tc)2 = 10 600 / 80 = 132.5 or tc = 11.5 mm Ans. Let us now check the design for the induced bending stress due to inertia bending forces on the...
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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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