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).
Test report on a buffer stop for a servo balance lever, comparing steel plates with rubber blocks to reduce noise.
| Identifier | ExFiles\Box 105\4\ scan0066 | |
| Date | 2nd October 1929 | |
| 2.10.29. TESTS CARRIED OUT WITH BUFFER STOP APPLIED TO SERVO BALANCE LEVER TO SKETCH R:1966 This stop was designed to prevent the clanking of the servo levers when released. The first test proved that to use a steel plate (as per sketch) for the lever to hit against, was as noisy as the levers without it. We therefore dispensed with the steel plate and used a rubber block only. The stop works fairly satisfactory, with all the brakes set up correctly. Noises come from the front brake equalizing shaft (which tries to act as a stop), the front brake levers on the front axle, the foot pedal hitting against the stop, and from the rear brake levers hitting the axle. The stop fails to function when the front brake ropes are placed in tension, and also when there is tee much slack in the rear brake ropes. To make it work satisfactory, it was found necessary to fit a damper stop to the front brake equalising shaft and to take all slack out of the rear brake ropes, otherwise a lag occurred which could be felt as the brakes were applied. Under these conditions no noise is obtainable from the servo leverages, but a distinct metallic noise comes from the foot pedal, and from the front and rear brkae levers. The adjustment will have to be correct to obtain these results. We have tried an improved dash pot damper which is a distinct improvment over the fitting of the stops. | ||