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).
Letter from Paul Quinn Ltd. concerning a rough scheme for mounting a flywheel on rubber bushes.
| Identifier | ExFiles\Box 170\1\ img030 | |
| Date | 20th October 1938 | |
| 1110 DIRECTORS: K.{Mr Kilner} L. WATSON, F.C.A. P. QUINN (BRITISH). S. S. TRESILLIAN, B.A., A.M.I.A.E., M.S.A.E. PAUL QUINN LTD. MANUFACTURERS OF 'HIBUDINE' SYNTHETIC RUBBER HEAD OFFICE: BUSH HOUSE, LONDON, W.C.2. TELEPHONE: TEMPLE BAR 8324. " " 8554. Your Ref: Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}E/MI. FACTORY: IPSWICH ROAD, TRADING ESTATE, SLOUGH, BUCKS. TELEPHONE: SLOUGH 22412. TELEGRAMS & CABLES: 'HIBUDINE' SLOUGH 20th. October 1938. M.{Mr Moon / Mr Moore} R.{Sir Henry Royce} Chandler, Esq., Messrs. Rolls-Royce Ltd., Experimental Dept., Nightingale Road, DERBY. Dear Mr. Chandler, In reply to your letter of the 8th. of September about mounting a flywheel on rubber, we attach print showing a rough scheme we have got out for bonding the flywheel to a hub and also centering the flywheel on two moulded bushes which can be made either of bakelite containing graphite, Ferodo, or extra hard Hibudine synthetic rubber, also containing graphite. These bushes give axial location to withstand clutch pedal thrust and also radial location to ensure concentricity. The flywheel however is free torsionally and in a "wobble" sense. The moulded rubber insert shown will transmit a torque of approximately 4,900 lbs. ft. without exceeding a sheer stress against the steel of 500 lbs. per sq.in. This is quite a moderate figure for rubber bonded to steel. You will see that it gives a considerable factor of safety over the torque figure mentioned in your letter, to allow for the fact that the torque output from the crankshaft to the flywheel will vary considerably, since the total flywheel effect on the bare crankshaft is not very large. Cont'd... ... ... ... - 1 - | ||