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 gearbox with American-produced gears (PH.111), detailing noise issues and potential improvements.
| Identifier | ExFiles\Box 94\2\ scan0274 | |
| Date | 9th August 1937 | |
| RHC{R. H. Coverley - Production Engineer}/A.McW.1/MJ.9.8.37. GEARBOX CONTAINING AMERICAN PRODUCED GEARS (PH.111). The above box has been built up and tested upon the production test rig for "quietness", and has proved noisy in all speeds. Running in neutral, the constant mesh gears produced a high frequency uneven noise, which increased in volume under load conditions. This defect appeared general in all speed ratios throughout the box. The Standard Ph.lll transmission train was produced by the Fellows Gear Shaper Company and manufactured by methods typical of those employed by the members of the Chrysler Corp. of America. The gears produced are - G.81570 Constant Mesh Wheel. G.82925 Constant Mesh Pinion. G.84315 3rd. Speed Driven Gear. G.81571 3rd. Speed Driving Gear. G.84800 2nd. Speed Driven Gear. G.82903 2nd. Speed Driving Gear. G.82928 1st. Speed Driven Gear. G.81575 1st. Speed Driving Gear. G.81578 Reverse Gear & Shaft. G.82169 Reverse Driving Gear. The transmission was produced to R.R. design which in the opinion of the Fellows Design Staff showed good tooth action, and suggestions by them to improve this could not be put forward. The incorporation of the helical type tooth finishing in opposition to the conventional tooth rounding was suggested and employed. MEASUREMENT OF GEARS PRIOR TO ASSEMBLY. The measurement of tooth form and eccentricity was conducted upon all gears where production tackle was available, and could be devised. Following is the data obtained - (See over) | ||