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).
Design improvements for a semi-servo braking system, comparing different methods for securing fabric linings.
| Identifier | ExFiles\Box 95\4\ scan0103 | |
| Date | 3rd December 1934 | |
| GRY{Shadwell Grylls} +341 To EY. from HDY.{William Hardy} HDY.{William Hardy}1/HP.3.12.34. c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Da.{Bernard Day - Chassis Design} RHC.{R. H. Coverley - Production Engineer} Mx.{John H Maddocks - Chief Proving Officer} Sft.{Mr Swift} Servo for Semi Servo Braking System. N. Sch.4283 herewith shows the above. Compared with the existing SpectreCodename for Phantom III servo the mean diameter has been increased by 21% and is now practically the same as for the Phantom. At the request of the Experimental Department we have abandoned the fully floating fabric linings, and have located them relative to the discs, as shown. Tests prove that lower temperatures are secured in this way. With regard to the method of locating the linings by keys formed in the fabric, this is also the suggestion of the Experimental Department, and the object is to reduce the handling of the linings to the minimum and thus to enable them to be kept as free from traces of oil as possible. The slightest amount of oil is found to be detrimental to the lining efficiency and the effect persists for some considerable time. This scheme will no doubt be more expensive than riveting the linings in place, and for this reason we shall be sending an alternative scheme with rivets, and suggest that the two methods should be tried out side by side, to determine if possible whether the more expensive scheme with keys and slots is justified. The driven discs and shafts are entirely clear of one another except at the outer ends. The relative location of the inner ends is provided by the flexible plate, the machining in connection with which must be accurate, as it is important that the clutch disc surfaces are parallel. The cam levers are shown floating clear of the shaft | ||