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).
Experiments with clutch disc fabrics, linings, and lubricants to resolve vibration issues.
| Identifier | ExFiles\Box 170\2\ img198 | |
| Date | 26th August 1934 guessed | |
| -2- Various forms of flexible drive in the clutch disc were only partially successful. Tapering the clutch fabric so that it was .002" to .003" thicker on the inner than on the outer edge was a partial improvement. Whitmores now supply a transmission lubricant which is partial-ly successful. In moderate cases it damps out the vibration of the synchromesh sleeve so that the clatter is almost inaudible. A new clutch lining material with higher graphite content used with a tapered lining as above has so far proved most successful. The characteristic of this lining which we have found so far is that it has a higher running coefficient of friction at light loads than at heavy loads. Probably the static coefficient is low but we don't know this yet. It is made by Manhattan Rubber Company and known as Raybestos-Manhattan #753. Perhaps it is worth while adding that at Springfield we found that whereas "wobble" of the driven disc had little effect on clutch chatter, absolute uniformity in thickness of the driven disc was all important. Sincerely yours, [Signature: Olley] Maurice Olley CC: Mr. R.{Sir Henry Royce} Beringer | ||