Of crank pin or big end bearing 2 thickness of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online