When one end of the rocker arm is pushed up by the

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Unformatted text preview: 103 × 150 = 145 × 10 6 N-mm ∴ Equivalent twisting moment, Te = (M R )2 + T 2 = (6.27 × 106 ) 2 + (4.5 × 106 ) 2 = 7.72 × 106 N-mm We also know that equivalent twisting moment (Te), π π (d )3 τ = (d )3 30 = 5.9 (d s )3 7.72 × 106 = ...(Taking τ = 30 MPa) 16 s 16 s ∴ (ds)3 = 7.72 × 106 / 5.9 = 1.31 × 106 or ds = 109 mm Actually, ds should be more than d1. Therefore let us take ds = 200 mm Ans. 32.22 Valve Gear Mechanism The valve gear mechanism of an I.C. engine consists of those parts which actuate the inlet and exhaust valves at the required time with respect to the position of piston and crankshaft.Fig .32.20 (a) shows the valve gear arrangement for vertical engines. The main components of the mechanism are valves, rocker arm, * valve springs, **push rod, ***cam and camshaft. Fig. 32.20. Valve gear mechanism. * For the design of springs, refer Chapter 23. ** For the design of push rod, refer Chapter 16 (Art. 16.14). *** For the design of cams, refer to Authors’ popular book...
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