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).
The failure analysis of a Phantom clutch friction plate after 10,000 miles of use.
| Identifier | ExFiles\Box 11\4\ 04-page148 | |
| Date | 27th September 1932 | |
| x7941 R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/GWI. c.c. SS.{S. Smith} Nor. c.c. L. Da.{Bernard Day - Chassis Design} c.c. BY.{R.W. Bailey - Chief Engineer} Hdy.{William Hardy} Hs{Lord Ernest Hives - Chair}/GWI.9/KR.27.9.32. RE. PHANTOM CLUTCH. x7300 x7941 The position of the clutch is still not satisfactory with the stronger clutch springs fitted. Upon dismantling the clutch of 19-GX (10,000 miles car) we find that the friction plate A.75724 had the same features of failure as previous, although whilst running there had been no indication of this taking place. We have had the friction plate carefully measured up. It would appear that as a result of the heavy torque loading of the clutch, arising from the easy-changing and use of the synchromesh gearbox, has had the effect of forcing metal from the leading edge of the sectors according to the direction of the torque, with the result that the slot width has increased as shewn on attached print, which also indicates where the folds in the metal have occurred, the sectional thickness of the plate in these places instead of being .100 is .110". Hs{Lord Ernest Hives - Chair}/GWI. | ||