# D 491 10 3 n mm 8 8 we also know that maximum bending

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Unformatted text preview: 35 = 21 mm Ans. Let the piston pin be made of heat treated alloy steel for which the bending stress ( σ b )may be taken as 140 MPa. Now let us check the induced bending stress in the pin. We know that maximum bending moment at the centre of the pin, 39 275 × 100 P .D = = 491 × 10 3 N-mm 8 8 We also know that maximum bending moment (M), M= (d0 )4 − (di )4 π (35)4 − (21) 4 σb = σb = 3664 σb 32 35 d0 3 / 3664 = 134 N/mm2 or MPa σ b = 491 × 10 ∴ Since the induced bending stress in the pin is less than the permissible value of 140 MPa (i.e. 140 N/mm2), therefore, the dimensions for the pin as calculated above (i.e. d0 = 35 mm and di = 21 mm) are satisfactory. 491 × 103 = π 32 Fan blows air over engine to cool it Air filter stops dust and dirt from being sucked into engine Driveshaft Disk brake Spark plug Twin rotors German engineer Fleix Wankel (1902-88) built a rotary engine in 1957. A triangular piston turns inside a chamber through the combustion cycle. 1144 n A Textbook of Machine Design 32.13 Connecting R...
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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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