4 design for tappet screw the adjustable tappet screw

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Unformatted text preview: = × 2460 × 24 24 24 = 12 300 N–mm ...(∵ t2 = l2 / 2) = Fig. 32.27 Internal Combustion Engine Parts n 1199 and section modulus of the pin, π π (d 2 )3 = (18)3 = 573 mm3 32 32 ∴ Bending stress induced in the pin Z= M 12 300 = = 21.5 N/mm 2 or MPa 573 Z This 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 × 18 = 36 mm The outer diameter of the roller is taken slightly larger (atleast 3 mm more) than the outer diameter of the eye. In the present case, 42 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 + 2 × 1.5 2 12 + 3 = 39 mm = 24 + 2 × 2 3. Design for rocker arm cross-section The cross-section of the roker arm is obtained by considering the bending of the sections just near the boss of fulcrum on both sides, such as section A – A and B –...
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