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 assembly of axle shafts, detailing interference fits and the process of shrinking on collars.
| Identifier | ExFiles\Box 111\4\ scan0050 | |
| Date | 8th August 1938 | |
| - 2 - HPS.{Horace Percy Smith - Experimental Factory Mgr}2/VS.{J. Vickers}8.8.38. This presumably accounts for the introduction of the "Belleville" type washer adopted by certain other manufacturers. To counteract this a clamp was made to hold the collar in position on the axle shaft proper whilst cooling off. Assembly of Shafts. The finally recommended interference was .0046 with a limit of .00025 on both collar and shaft. Two pairs of shafts to Ex.31270 A and B in S.28 material were supplied complete with bearings, etc. and collars giving the recommended interferences. The collars were shrunk on from a temperature of 350°C. without difficulty, but although held securely by the clamp during cooling the collars in one instance did not sit squarely on to the bearing after releasing the clamp, being tilted .0015. For future reference a record was taken of the shaft diameters and the bores of the collars, the latter being etched on the outside and each collar indexed with the shaft. As you are aware, two axles incorporating this scheme have been produced, the first fitted to 1.B.50 incorporated S/ZNCR axle shafts, whilst the second fitted to 8.B.V. had S.28 material shafts. HPS.{Horace Percy Smith - Experimental Factory Mgr} | ||