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).
Troubleshooting brake squeaking, drum scoring and wearing on the Goshawk 11 model.
| Identifier | ExFiles\Box 5\3\ 03-page051 | |
| Date | 25th January 1922 | |
| To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} X4257 GOSHAWK 11. BRAKES. X.4257 Hs{Lord Ernest Hives - Chair}1/LG25.1.22. We believe we shall most probably find when we have overcome the trouble of the brake drums scoring and wearing, the squeaking will also disappear. When the drums are new the squeak-ing is negligible but as the drums rough up it becomes so bad that one dreads to apply the brake. The reason the squeaking disappeared when we changed over the foot operated brake was because, the side brake had not been used to any extent and the drum was in good condition. We have proved on the Goshawk that we can cure the worst of squeaking brakes if we lag the brake drums We have done this by making a sheet metal band round the drum with a piece of sheet asbestos between the band and the drum. With this lagging on, we cannot get a sign of squeaking. We have never been able to prove at any time that the rivets have caused squeaking. We have carried out a number of tests on the 40/50 H.P. chassis brakes on this point. We have had brakes squeak equally as bad when the rivets have all been definitely countersunk. We have never used either steel or brass rivets. We have used both copper and aluminium. We are running Goshawk cars with both aluminium and copper rivets. There is no difference in the degree of squeaking. The reason we use copper is because on the original 40/50 experiments it was found that under severe heating, that is, when the brakes become red hot, aluminium rivets tend to crumble away. Hs.{Lord Ernest Hives - Chair} | ||