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).
Noise from rear shock absorbers being proportional to the amount of friction on the first stage.
| Identifier | ExFiles\Box 78\2\ scan0312 | |
| Date | 18th June 1920 | |
| X.3461b To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} CJ. Bn.{W.O. Bentley / Mr Barrington} E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} Hsl/AT18.6.20. X.3461b. REAR SHOCK ABSORBERS. X.3812. We find that the noise that comes from the rear shock absorbers is in proportion to the amount of fric- tion on the first stage. When shock absorbers are put together they are packed full of grease. In this condition friction on the first stage is 16 or 17 lbs. We find, how- ever, that after the car has run a long distance in some cases friction on the first stage has gone up to 30 or 40 lbs. In this condition there is a distinct noise caused by the shock absorber. In-crease in friction occurs very much more rapidly on the first stage than on any other stage, in fact from the third and fourth stages we have never found that there has been any increase. We think the reason friction increases on the first stage is because, practically the whole time the car is run on the road, this stage is in operation and, undoubtedly, the grease which is originally between the faces works out. We have so far been able to cure all, object- ionable noise from shock absorbers if we make certain that the friction on the first stage does not exceed 20 lbs. Hs.{Lord Ernest Hives - Chair} | ||