From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations of force and oscillation on a Straight 8 engine camshaft wheel.
| Identifier | ExFiles\Box 132\2\ scan0155 | |
| Date | 22th February 1939 | |
| Crankshaft General File. Rm.{William Robotham - Chief Engineer} c. BY.{R.W. Bailey - Chief Engineer} c. Da.{Bernard Day - Chassis Design} 1116BY/B.3/G.22.2.39. SIDE SPOOKER STRAIGHT 8 ENGINE. Force required at teeth of camshaft wheel to cause it to oscillate with crankshaft pinion. It is assumed that there is no backlash between teeth, that crankshaft nose oscillates through ± 6°, and that the only inertia on camshaft is that of cam wheel. My calculated 4th order critical speed is 2875 R.P.M. Vibrations per sec. = 191.6 Circular frequency of vibration = φ = 2πx 191.6 = 1204 radians/sec. M of I of camshaft gear = .0215 lbs.inch² / 386.4 units P.C. rad. of camshaft gear = 3.35" Tangential force at pitch circle = 49 lbs. Torque = 13.7 lbs ft (200) Maximum peripheral velocity of pitch circle due to oscillations = 21.2 inches/sec. Maximum peripheral acceleration of pitch circle = 25,500 inches/sec.² Torque for B60 = 432 lbs in VRS. BY/B. G.S. Bower | ||