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).
Two distinct sources of a clanking noise in the brake system upon release and proposing a solution.
| Identifier | ExFiles\Box 41\1\ Scan114 | |
| Date | 8th August 1929 | |
| X3681 Sg.{Arthur F. Sidgreaves - MD} 96. c. Hs.{Lord Ernest Hives - Chair} BY3/G.8.8.29. R.R.A.I. - BRAKES. Referring to OY's letter of July 12th (ref. OY.10) sent under cover of Sg{Arthur F. Sidgreaves - MD}1/D26.7.29. the memo in question does not make clear to us if OY. realizes that there are two distinct sources of clanking when the foot brake is released.- a/- That discussed by OY. in his memo. b/- A clank produced by the stop on the servo plate coming back into contact with the lever from which it had moved away on brake application. The clank referred to under heading (b) is distinctly the worst in regard to production of noise and making itself felt. We think OY's method would be reasonable for dealing with the clank under heading (a), but it will not affect that produced under heading (b). In the Repair Department at the Works Hm.{Capt. W. Hallam - Head Repairs} has developed a scheme for overcoming the second clank, which consists in placing a stop on the back of the Tee lever at its upper end, so as to prevent the brake at this end moving back beyond a certain point when the brake is released. The effect of this is to prevent the stop on the servo disc from reaching the lever against which it knocks to form the clank. This proposal has been put forward by our Experimental Department to R.{Sir Henry Royce} as the best scheme so far suggested for overcoming the trouble under discussion. We would suggest that America try out our Repair Department's scheme, which simply consists of clamping a stop made in Ferodo and arranged on a pivot, so that it lines itself up with the back of the Tee lever, for which it forms the stop, as this certainly appears to us to be the best method of dealing with the trouble under discussion. BY.{R.W. Bailey - Chief Engineer} [Handwritten note in margin]: to the arm carrying the T lever | ||