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).
Customer complaints about clanking noises from the brake mechanism and proposed solutions.
| Identifier | ExFiles\Box 16\3\ Scan075 | |
| Date | 8th October 1929 | |
| R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} OY. X7370 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/AD8.10.29. X.7420 X.7370 X.5420 X.5370 CLANKING OF BRAKE MECHANISM. We regularly get complaints about the clank which occurs in the brake mechanism when the pedal is released. The serverity of the noise varies with the amount of travel on the front and rear shoes respectively. A large proportion of the noise heard by the drive comes from the small scissor levers hitting the servo driving pins. We have a number of suggestions from Oy, as to how to cure this, the attached print shewing the recommendations. We have tried these out carefully, however, and have come to the conclusion that the cure achieved by these means is not consistent over the whole range of brake wear, it also introduces peculiarities into the brake operation that are not desirable. The attached sketch R.1966 is a suggestion from the Repair Dept. that we have tried out. This achieves the required result of reducing the noise from the servo as long as the front pull off springs return the swinging arm to the same position each time. We find, however, that the swinging arm friction on the 20 HP. is not so consistent as that on the Phantom. In order to avoid front brake thumps, this friction as to be set initially at a load where there is not very much margin to ensure that the swinging | ||