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).
Torsional vibration in the gearbox coupling and proposing a simpler, stiffer design.
| Identifier | ExFiles\Box 25\3\ Scan114 | |
| Date | 9th February 1924 | |
| V6324 S E C R E T. To Mr. Stent. Mr. Elliott. } FROM R.{Sir Henry Royce} R4/M9.2.24. EAC.1V - COUPLING TO GEARBOX. X.4604 X.9320 X.634 Naturally flexibility between the flywheel and gearbox may permit of a period of torsional vibration as on the present retard at 40 MPH. Will you therefore see that the coupling and shaft for the above is sufficiently stiff which we scarcely can pre-determine with certainty, or is so designed that the stiffness can be increased if found necessary. Sometimes I think the whole central portion of the transmission vibrates torsionally which would include the gearbox gears, two bevels and the differential, and some- times I think it may be the universal joint portion of the longitudinal shaft. The arrangement on LEC.1822 seems O.K. but it really does seem a pity to add 2 joints, one small dia. serrated, and one cone and key for the sake of the small movement there may be but as it seems necessary to have a large shaft, and with a large shaft could we do without one joint - see sketch, which shews a simpler and simpler arrangement, to let Derby have something quickly. SEE ORIGINAL FOR SKETCH. At least could you give an alternative to test. The above would be simple and torsionally stiff. R.{Sir Henry Royce} | ||