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).
Design and material specifications for a torque tube, axle tubes, and driving shaft.
| Identifier | ExFiles\Box 77\1\ scan0120 | |
| Date | 22th July 1919 | |
| To DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} Copy to CJ. " " Mr. Hall. " " EN. RE TORQUE TUBE. We have decided that this should be a straight taper on the outside from the commencement of the parallel bore to where the flange is fitted at the gear box end. The forging for the stays and the flange will be put on to an exact position with just sufficient clearance to ensure the flow of the brazing metal. It is assumed that this brazing will do less harm than putting the parts together with hydraulic pressure. The material from which the tube is to be made should be suitable for brazing after the usual heat treatment which, in the case of this long tube, might consist of normalising. I would like Mr. Hall to go into the question of which of the usual tube metals is most suitable for making a reliable torque tube with portions brazed on. With reference to the axle tubes, we have up to now avoided brazing and shall probably be able to fix on the bearing for the brake actuating shafts by screws and sweating, and therefore the material for these tubes can be of a rather different class. Regarding the driving shaft running within the tube, I think it will be quite unwise to make this of the old diameter shewn in your drawing N. scheme 63 because this shaft must be capable of running up to 4,000 revs. without s whirling. It would therefore have to be of considerable | ||