7 say 10 mm ans 4 design for tappet screw the

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Unformatted text preview: wn in Fig. 32.31. The maximum bending moment will occur at Y – Y. Neglecting the effect of clearance, we have Maximum bending moment at Y–Y, t2 = Fc l2 t2 Fc l2 M = 2 2 + 3− 2 × 4 Fc l2 l2 Fc l2 = 2 2 + 6 − 2 × 4 ...(∵ t2 = l2/2) 5 × Fc × l2 = 24 5 × 885 × 14 = 2581 N-mm = 24 and section modulus of the pin, π π (d )3 = (11)3 = 131 mm3 Z= 32 2 32 ∴ Bending stress induced in the pin Fig. 32.31 M 2581 = = 19.7 N/mm2 or MPa Z 131 The bending stress induced in the pin is within permissible limits. Since the radial thickness of eye (t3) is taken as d2 / 2, therefore, overall diameter of the eye, D2= 2 d2 = 2 × 11 = 22 mm The outer diameter of the roller is taken slightly larger (at least 3 mm more) than the outer diameter of the eye. In the present case, 28 mm outer diameter of the roller will be sufficient. Providing a clearance of 1.5 mm between the roller and the fork on either side of the roller, we have = t2 7 + 2 × 1.5 = 14 + 2 × + 3 = 24 mm 2 2 3. Design for roc...
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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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