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).
Technical report on clutch design issues and proposed solutions for both Rolls-Royce and Bentley vehicles.
| Identifier | ExFiles\Box 85\2\ scan0295 | |
| Date | 16th November 1936 | |
| -6- Hm{Capt. W. Hallam - Head Repairs}/Smth.39/AP.16.11.36. (1) R.R. or, if former squeaks, cross cushion plate with VM.20 facings and .030 cushioning. The present separation should be sufficient for the R.R. plate, but the cross cushion plate will require another .015 as B. & B. cannot hold the run out to such close limits as we can. (2) Thrust springs Hm.{Capt. W. Hallam - Head Repairs}31. (3) 1" extra pedal travel N.Sch.4937/8. With R.R. plate the leverage of the linkage could be increased 20% thus using extra travel to reduce the load. The pedal load would now be 28% less than at present for the R.R. plate and 10% for the cross cushion. (4) Ventilation to N.Sch.4943. (5) No oillite bush - Hm.{Capt. W. Hallam - Head Repairs}109. ----------- 25//30 & BENTLEY. Troubles are:- (1) Jagger. (2) Lug wear. (3) Manufacturing faults. (1) Jagger Very little trouble is experienced if B. & B. maintain specified limits for finger setting and driven plate thickness. We are trying 50% more cushioning (i.e. .045) using both standard B. & B. and cross cushion plate. On Bentley we propose to use moulded facings and the cantilever pedal scheme N.Sch.4776, which is probably more costly, but gives better geometry. (2) Lug Wear At present this gives no trouble on the road, but does on the test bed when running at high speeds. Wear occurs on road if an 11" clutch is fitted to a Bentley and we are anticipating trouble on the standard arrangement by having a clutch built up with extra bearing area for the pressure plate lugs. continued. | ||