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).
Analysis of the causes of engine gear whine, focusing on idler wheel bedding and crankcase alignment.
Identifier | ExFiles\Box 136\1\ scan0091 | |
Date | 19th September 1933 guessed | |
-2- Attempts were made to correct the idler wheel bedding by tilting its axis but were not continued owing to lack of time. The gear whine can be attributed to the cross bedding of the idler wheel. The method of obtaining the bedding of the gears after erection of the engine by blue marking the wheels is very probably not sufficiently accurate to determine the small errors that cause whine. It is therefore possible that the gears were not giving a full width bedding as erected and before running. It has been suggested that the crankcase distorts the first time the engine is run and warmed up. The fact that the gear whine was noticed immediately the engine was started up the first time suggests that the gears were not bedding correctly as first received, and that distortion due to warming up was not the cause of the whine on B.5. The cause was therefore either incorrect alignment of the lapping rig, or of the crankcase, or a combination of both. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||