Fig 3224 rocker arm for exhaust valve let mv dv h a

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Unformatted text preview: he valve head, 4 p t = k · dp = 0.42 × 60 = 7.43 say 7.5 mm Ans. σb 46 2. Stem diameter σt = We know that stem diameter, dp 60 + 6.35 = + 6.35 = 13.85 say 14 mm Ans. ds = 8 8 We know that maximum lift of the valve, dp 60 60 = = h= = 17.32 say 17.4 mm Ans. 4 cos α 4 cos 30º 4 × 0.866 32.24 Rocker Arm The * rocker arm is used to actuate the inlet and exhaust valves motion as directed by the cam and follower. It may be made of cast iron, cast steel, or malleable iron. In order to reduce inertia of the rocker arm, an Isection is used for the high speed engines and it may be rectangular section for low speed engines. In four stroke engines, the rocker arms for the exhaust valve is the most heavily loaded. Though the force required to operate the inlet valve is relatively small, yet it is usual practice to make the rocker * Roller followers in an engine rocker mechanism The rocker arm has also been discussed in Chapter 15 on Levers (Refer Art. 15.9). Internal Combustion Engine Parts n 1193 arm for the in...
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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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