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# Now the various parts of the crankshaft are designed

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Unformatted text preview: in Fig. 32.19. We have already discussed in the design of a centre crankshaft that the thrust in the connecting rod (FQ) gives rise to the tangential force (FT) and the radial force (FR). Fig. 32.19. Crank at an angle of maximum twisting moment. Due to the tangential force (FT), there will be two reactions at the bearings 1 and 2, such that F ×a F (a + b ) ; and HT2 = T HT1 = T b b Due to the radial force (FR), there will be two reactions at the bearings 1 and 2, such that F ×a F (a + b) ; and HR2 = R HR1 = R b b The reactions at the bearings 1 and 2 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 crank web. The most critical section is where the web joins the shaft. This section is subjected to the following stresses : (i) Bending stress due to the tangential force FT ; 1174 n A Textbook of Machine Design (ii) Bending stress due to the radial force FR ; (iii) Dir...
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