We know that bending moment at the centre of the

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Unformatted text preview: ( H 2 + H 2 ) 2 + (V2 ) 2 ′ T1 is the belt tension in the tight side and T2 is the belt tension in the slack side. 1164 n A Textbook of Machine Design and the resultant force at bearing 3 is given by R3 = ( H 3 ) 2 + (V3 ) 2 Now the various parts of the centre crankshaft are designed for bending only, as discussed below: (a) Design of crankpin Let dc = Diameter of the crankpin in mm, lc = Length of the crankpin in mm, σ b = Allowable bending stress for the crankpin in N/mm2. We know that bending moment at the centre of the crankpin, MC = H1 · b2 ...(i) We also know that π (d )3 σb MC = ...(ii) 32 c From equations (i) and (ii), diameter of the crankpin is determined. The length of the crankpin is given by FP Ic = d . p cb where pb = Permissible bearing pressure in N/mm2. (b) Design of left hand crank web. The crank web is designed for eccentric loading. There will be two stresses acting on the crank web, one is direct compressive stress and the other is bending stress due to piston gas load (FP). Water cooled 4-cycle diesel engin...
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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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