E 14 mm the width of cam w is also taken empirically

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Unformatted text preview: various dimensions for the valve spring as discussed below: (a) Mean diameter of the spring coil Let D = Mean diameter of the spring coil, and d = Diameter of the spring wire. 885 = 1208 n A Textbook of Machine Design Inside view of an automobile We know that Wahl’s stress factor, K= 4C − 1 0.615 4 × 6 − 1 0.615 + = + = 1.2525 4C − 4 4×6−4 6 C ...(Assuming C = D/d = 6) and maximum shear stress (τ), 420 = K × 8 WC πd 2 = 1.2525 × 8 × 176 × 6 πd 2 = 3368 d2 ∴ d 2 = 3368 / 420 = 8.02 or d = 2.83 mm The standard size of the wire is SWG 11 having a diameter ( d ) = 2 .946 mm A ns. (see Table 22.2) ∴ Mean diameter of spring coil, D = C · d = 6 × 2.946 = 17.676 mm Ans. and outer diameter of the spring coil, Do = D + d = 17.676 + 2.946 = 20.622 mm Ans. (b) Number of turns of the coil Let n = Number of turns of the coil, We know that maximum compression of the spring. δ= 8 W · C3 · n δ 8 C3 ·n = or G·d W G ·d Internal Combustion Engine Parts n 1209 Since the stiffness of the spring, s = W / δ = 8 N /...
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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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