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 considerations for the 3/19 gear box and chassis components for the 40/50 HP American Chassis.
| Identifier | WestWitteringFiles\D\November1919\ Scan10 | |
| Date | 17th November 1919 | |
| ORIGINAL x3720 To B.H. from E.{Mr Elliott - Chief Engineer} Copy to Cd. BR.{T. E. Bellringer - Repair Manager} EFC. E1/G17/11/19. RE 3/19 GEAR BOX - 40/50 H.P. AMERICAN CHASSIS. Referring to our memo E6/G13/11/19 concerning the above, the drawings we sent to you give the major portion of the information you will require for building the 3/19 gear box and for arranging the remainder of the chassis. The cross member immediately in front of the gear box is shewn on LeC.1157. The cross member that comes immediately behind should be placed as close up to the box as possible, bringing with it the universal joint. The final gear shaft will either be made solid with the driving member of the universal or bolted to it, according to the amount of room the foregoing allows. A longer torque tube will be required for the rear axle and the front supports for the rear springs will no longer be opposite a cross tube, since the rear springs will remain at their present length, whereas the ball on the torque tube will travel forward a little. There are various remarks to be made with regard to scheme LeC.1157, as follows:- (1) Two schemes should be tried for fixing the non-sliding wheels on their shafts. (a) Treat exactly the same as the sliding wheels, that is to say, castellations running right through but rather tighter fit. (b) Grind plain bands on the shafts of 1 in 200 continuous taper, and grind bores of wheels to fit these bands. (b) scheme is the one actually shewn on LeC.1157. (Contd.) | ||