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).
Modifications to a 3rd-speed easy-change gearbox, including diagrams.
Identifier | ExFiles\Box 15\5\ Scan081 | |
Date | 3rd April 1929 | |
DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence) X7310 SECRET. RL/M1 3.4.29. Rec'd at WW. 16.4.29. c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} OY. Mr.Claremont. GEARBOXES X523 X5210 We need one of our 3rd speed easy changes as soon as ever possible. Easy change is more important than silence but both would be acceptable. Somebody must be always on this work until it is satisfactory. Since we have nearly complete the 20HP. freewheel sideshaft we ought to be busy with the SS.{S. Smith} of the same design. N. sch. 2767. (received) should be made as soon as possible with the following modifications:- (1) The roller cage is shewn brought our through windows at both sides (I think you have added this since I saw it at WW.) I cannot see any advantage, and fear it may cause friction, or be not quite free. I think we should cancel the legs on this side. (2) It will be noticed that to be reliable the cage of rollers should follow the inner surface - i.e. the surface to be gripped, therefore it can be a close fit even with some slight friction on this surface and the bore of the cage, but on the sides of the cage the surface should be reduced to a small area so that the viscosity of the oil shall not affect it much. The cage should be a fairly close fit sideways (say .005" clear) so as to give good control. The outside of the cage and the legs should be quite clear - I suggest about .05". (3) Since the windows for the legs and springs only cut a small percentage of the circumference, I think the quickest way to cut these windows would be to drill a number of radial holes right through. After this the milling cutter would have an easier task. This milling cutter should be as large in dia. as possible, twice what your drawing suggests. This is the window to get the spring in and its end should be the stop for the cage in the fully out position. The window through which the legs pass could be circularly milled (circular slot milling) afterwards somewhat as shewn in sketch; (1) | ||