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).
The investigation of an engine gear rattle in the Goshawk 11.
| Identifier | WestWitteringFiles\I\September1922\ Scan54 | |
| Date | 9th September 1922 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to M.{Mr Moon / Mr Moore} c. to Ds. c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL. Hs{Lord Ernest Hives - Chair}1/L09.9.22. GOSHAWK 11. ENGINE GEAR RATTLE. X 4247 We have carried out a number of tests in connection with this and find that the rattle is very elusive and so far we have not been able to arrive at any definite decisions. The points we have proved so far are :- 1. The rattle is there if no dynamo is fitted. 2. That if cold oil is syringed on to the gears at a number of points, the rattle is overcome. 3. We consider in future that whenever we use helical Gears for engine gears, we should arrange thrust washers to prevent end play. We find that with the journal bearings, there is an appreciable end play allowed on all the gears which can cause a noise. We had the car arranged so that we could either run the engine under its own power or we could drive the engine by means of a belt from a motor to one of the rear wheels. We find that the rattle is there just the same whether the engine is running under power or being driven. We tried disconnecting the various units but as soon as we disconnect the oil pump we alter the conditions materially. Revolving the crankshaft pinion and camshaft only, these appear to run quite smoothly. We are not sure that the oil pump may have something to do with the rattle. We have proved at the very low speeds with thin oil, the load on the oil pump is not continuous but one can feel each tooth. Further report will follow. Hs.{Lord Ernest Hives - Chair} | ||