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).
Difficulties with clutch stops during testing of a Japan III synchro mesh gearbox.
| Identifier | ExFiles\Box 181\M13\M13.2\ img131 | |
| Date | 6th November 1931 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. SE. c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Pa.{Mr Paterson} EV.{Ivan Evernden - coachwork} ORIGINAL Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/AM.6.11.31. X.7480. X.5480. CLUTCH STOPS. --------------- During the test on Japan III synchro mesh gear box having a driven plate fitted with a similar moment of inertia to the Phantom II, we found considerable difficulty in getting the clutch to stop for the engagement of first or second speeds. This is rather what we expect since we have always had a certain amount of trouble in getting the clutch of the 40/50 to stop unless we have some sort of brake. Actually, of course, the 40/50 is worse than the 25 HP. with the same inertia of the central plate because owing to the heavier spring pressure required, the clearance in the free position cannot be so large on the 40/50. It will be remembered that one of the improvements we got on the Phantom II was an effective clutch stop which was greatly appreciated by everyone. We believe that a certain number of complaints will arise with the synchro mesh box, especially if the fabric is on the driven member as shown on M.sch.3362, unless a mild form of clutch stop is fitted. The synchro mesh clutches are so powerful that we are certain they would not notice the difference when a small brake was fitted. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||