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 specifications for a 20 HP propeller shaft and torque tube, including details on tapering and couplings.
| Identifier | ExFiles\Box 77\1\ scan0118 | |
| Date | 22th July 1919 | |
| X 4255 To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to EH. c. to EFC. E3/G22.7.19. RE 20 H.P. PROPELLER SHAFT AND TORQUE TUBE X.3539. N. Scheme 63. Referring to the above, Mr. Royce has sent you some of the information separately in his note R1/G22.7.19. He asks that the taper on the outside of the torque tube may be continuous and unchanged from where the parallel bore starts right to the front end. The front end should be inserted into the loose flange which bolts to the gear box and should be prevented from going too far into the hole by an internal collar in the flange. The fit of the tube in the hole should leave sufficient slack to allow for brazing. Taper pins should be used as before. Regarding the driving shaft, the maximum diameter of the taper ends which takes the couplings should be larger than the parallel portion of the shaft so as to provide increased section for carrying the compressive stress due to the coupling being forced on hydraulically. The coupling should taper away in thickness so as to take up the torque gradually, and so that its thin end may not have too weak a grip a collar should be provided at this point which will prevent fidgeting between the surface of the tube and the coupling. Thus the coupling will taper away in thickness towards the end, but at the end will be locally thickened up. A point in connection with this scheme which, however, applies to the whole of the new design work, is that special nuts with milled hexagons should not be used except | ||