We know that bending moment at the centre of the

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Unformatted text preview: ere will be two reactions at bearings 1 and 2, such that F × b1 F × b2 ; and H T2 = T H T1 = T b b Due to the radial force (FR), there will be two reactions at the bearings 1 and 2, such that F × b1 F × b2 ; and H R2 = R H R1 = R b b Pull-start motor in an automobile The reactions at the bearings 2 and 3, due to the flywheel weight (W) and resultant belt pull (T1 + T2) will be same as discussed earlier. Now the various parts of the crankshaft are designed as discussed below : (a) Design of crankpin Let dC = Diameter of the crankpin in mm. We know that bending moment at the centre of the crankpin, MC = HR1 × b2 and twisting moment on the crankpin, TC = HT1 × r ∴ Equivalent twisting moment on the crankpin, Te = ( M C ) 2 + (TC ) 2 = ( H R1 × b2 ) 2 + ( H T1 × r ) 2 We also know that twisting moment on the crankpin, π (d )3 τ 16 c where τ = Allowable shear stress in the crankpin. From equations (i) and (ii), the diameter of the crankpin is determined. Te = ...(i) ...(ii) 1168 n A Textbook of Machine Design (b) Design of shaft under the flywheel Let ds = Diameter of the sha...
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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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