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).
Bentley rear axle shaft endurance tests and the suitability of different bearing types.
Identifier | ExFiles\Box 98\1\ scan0159 | |
Date | 22th May 1939 | |
BY.{R.W. Bailey - Chief Engineer} c. Rm.{William Robotham - Chief Engineer} c. HPS{Horace Percy Smith - Experimental Factory Mgr}/Dr. 402? DA.{Bernard Day - Chassis Design}2/G.22.5.39. BENTLEY REAR AXLE SHAFT ENDURANCE TESTS. Referring to HPS.{Horace Percy Smith - Experimental Factory Mgr}/Bl.1/CB.16.5.39. we should very much like to have known the amount of bowing under the different loads. It seems strange that this bowing can be so much as to shift the pressed on collar, because there is usually some thousandths of end play in a deep groove bearing. It is difficult to understand how the very commonly used Timken roller bearings stand up at all on these shafts, if the bowing is considerable. Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} suggests that we should try a Skefko Double Row Self Aligning Bearing. There is a type 21300 which goes into exactly the same space as the deep groove bearing. This type is not the best for taking end thrust, but it should show up well on this radial + bowing load test. When the Experimental test rig is available a test could be made applying a proportion of end load. If it shews inade-quacy under these conditions, there is a type 22300 which is wider and has much better end load characteristics. Either type may be more costly than a deep groove bearing, but we could ascertain this. An alternative is a spherically seated outer race deep groove, such as Hoffmanns supply. It certainly looks as though the 45 m/m.{Mr Moon / Mr Moore} bearing tried in the test was a defective bearing. DA.{Bernard Day - Chassis Design} | ||