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).
Analysis of shaft loads, rocking couples, and vibration related to the drivetrain.
| Identifier | ExFiles\Box 148\4\ scan0176 | |
| Date | 4th January 1944 guessed | |
| It will be seen that on the driving fork the rocking couple varies between +- T1 tan B in 180°, and is zero in the plane of the shafts. The loads on the bearings of the input shaft vary accordingly, except that they are always in the same direction relative to the plane of the shafts. A similar set of circumstances obtains at the rear axle pinion shaft. On the propeller shaft there is a bending moment in a plane at right angles to the plane of the shafts which varies between +- T1 sin B in 180°. The shaft deflexion is always in one direction relative to the chassis centre line. This bending moment reduces the theoretical whirling speed of the shaft, whilst the bearing loads may cause roughness. This propeller shaft vibration has been experienced on all Senior Range Cars. The big difference between these cars and their predecessors lies in the higher maximum value of B, and in that the input shaft bearing is carried on the frame cross and not the engine-cum-gearbox unit, which has great mass and is flexibly mounted. I have always suspected the existance of these bearing loads and was glad to have the opportunity of discussing the subject with Mr. Rolph of the Mechanics Universal Joint Divn. of Borg Warner Corp. who confirms the above analysis. Ev.{Ivan Evernden - coachwork} | ||