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).
Shaft repair methods, including continuous sleeves and ball bearing arrangements on motor shafts.
| Identifier | ExFiles\Box 181\M7\ img012 | |
| Date | 12th August 1912 guessed | |
| -3- Messrs Royce Ld., (contd) of it in spite of the occasional trouble of the extra difficulty of repairing a defective shaft. The second scheme is the use of a continuous sleeve possibly made out of wrought steel tube forging or casting in steel upon which the armature & commutator are mounted, and which can be castellated on the outside to receive the armature plates as in the case of the larger diameter shaft in scheme 1. With this scheme I should recommend that the shaft be made with 2 slightly different diameters and the sleeve be either hydraulically pressed on to the shaft or shrunk on, the former preferred. In this case only a shaft of moderate diameter would be needed and it could be pressed out if it needed replacing for repairs. With reference to the ball bearings on motor shafts, I believe that the standard type of journal bearings will be found satisfactory without thrust bearings, providing that the gearing is of such a pattern as to produce no end pressure, and the armature core is carefully centred relative to the pole piece. The main bearing next to the armature can be of a large & substantial pattern so that a moderate amount of end pressure would not be likely to harm it. Both this and the minor bearing should be cramped up on the shaft endways with a nut, this properly checked by a castellated end split pin or sheet steel washer bent over into the grooves provided for the rack spanner. There should be no attempt to cramp the outer member of such a bearing in its housing, and although this system may appear to have slight theoratical defects it has been satisfactory for us and other makers in motor car work and it is | ||