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).
Vibrations, noise and wear in the adopted servo brake gears.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan94 | |
| Date | 20th March 1924 | |
| R.R. 403A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. 9940 REF: Hsd/LCSO.5.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to DA.{Bernard Day - Chassis Design} HJ c. to HY.{Tom Haldenby - Plant Engineer} Wor.{Arthur Wormald - General Works Manager} S E C R E T. ADOPTED SCHEME OF BRAKES. We have not yet obtained quiet gears for driving the servo. The first gears were wide soft gears and were fitted with very little clearance between the teeth. On some of these gears which have run a fair distance, there were distinct signs of wear on the small pinions. With the adopted scheme we are using hard-ened gears. The big gear is also narrower and must float. With the gears on the adopted servo, we get very bad vibrations and growl when slight pressure is put on the brake pedal. It disappears if ample pressure is put on. The noise is there when the engine is stopped and the car is coasting. It appears to be nothing to do with the friction material because it is the same if slight load is applied on the outside of the servo drum. There are several experiments in hand to overcome this trouble. Hs.{Lord Ernest Hives - Chair} | ||