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Example 325 design a side or overhung crankshaft for

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Unformatted text preview: c T = H T 2 b1 − 2 = 42 400 − 2 = 13 545 kN-mm = 13.545 × 106 N-mm Piston and piston rod and shear stress on the arm, 4.5T 4.5 × 13.545 × 106 T = 12.7 N/mm2 or MPa = = ZP 245 (140) 2 w. t 2 We know that total or maximum combined stress, σ 1 ( σ c ) 2 + 4τ 2 (σc )max = c + 2 2 29.63 1 (29.63)2 + 4 (12.7) 2 = 14.815 + 19.5 = 34.315 MPa + = 2 2 Since the maximum combined stress is within the safe limits, therefore, the dimension w = 245 mm is accepted. (e) Design of left hand crank web The dimensions for the left hand crank web may be made same as for right hand crank web. ( f ) Design of crankshaft bearings Since the bearing 2 is the most heavily loaded, therefore, only this bearing should be checked for bearing pressure. We know that the total reaction at bearing 2, FP W T1 + T2 314.2 50 6.5 + + + + R2= = = 185.35 kN = 185 350 N 2 2 2 2 2 2 ∴ Total bearing pressure τ= Internal Combustion Engine Parts n 1183 185 350 R2 2 = l · d = 365 × 155 = 3.276 N/mm s1 2 Since this bearing...
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