T2 equation of motion 2 1 8 0 t a 001882 1767

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Unformatted text preview: = 0.42 and σb = 56 MPa) Valve stem diameter We know that valve stem diameter, ds = dp 45 + 6.35 = 11.97 say 12 mm Ans. + 6.35 mm = 8 8 Valve head diameter The projected width of the valve seat, for a seat angle of 45º, may be empirically taken as 0.05 dp to 0.07 dp. Let us take width of the valve seat as 0.06 dp i.e. 0.06 × 45 = 2.7 mm. ∴ Valve head diameter, dv = dp + 2 × 2.7 = 45 + 5.4 = 50.4 say 51 mm Ans. Now let us calculate the various forces acting on the rocker arm of exhaust valve. Internal Combustion Engine Parts n 1203 We know that gas load on the valve, π π (d v ) 2 pc = (51)2 0.4 = 817 N 4 4 Total load on the valve, considering the weight of the valve, P = P1 + w = 817 + 3 = 820 N Initial spring force, considering the weight of the valve, P1 = Fs = ...(Taking pc = 0.4 N/mm2) π π (d ) 2 ps − w = (51) 2 0.025 − 3 = 48 N 4v 4 ...(Taking ps = 0.025 N/mm2) The force due to acceleration (Fa) may be obtained as discussed below : We know that total angle of crank for which the valv...
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