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).
Secret memo detailing experimental improvements to a gearbox, including the reverse shaft, pinion sleeve, and striking forks.
Identifier | ExFiles\Box 6\4\ 04-page043 | |
Date | 30th January 1925 | |
X.5310 To BY.{R.W. Bailey - Chief Engineer} from AJS. S E C R E T. AJS2/M30.1.25. c. to CJ. R.{Sir Henry Royce} Hs.{Lord Ernest Hives - Chair} U. S. A.{Mr Adams} GEARBOX. We send herewith Lec.1991 (original to BY.{R.W. Bailey - Chief Engineer} and print to R.{Sir Henry Royce}) shewing improvements to this box, as dictated by results of experiments to eliminate the troubles recently experienced with 1st. speed and reverse wheels and shaft for latter. This drawing shews :- (1) Stiffened reverse shaft incorporating all the advantages of the one used in the recent experiments which produced good results, with the one exception that we have drilled up the one on Lec.1991 with a .400 hole which however should do no harm. This new shaft has a hexagon at rear end to hold it by while nut at other end is being tightened, this nut to have a L.H. thread. The inner race for roller bearing is now solid with shaft. (2) Pinion sleeve ground out parallel in the bore to 1.050 to suit parallel shaft. We have taken advantage of the elimination of the collar between inner race and shoulder on shaft (as was on the original design) to get the pinion to distribute its load nearer to the bearing centre. The collars between which the striking fork pads are located have been increased in radial depth a small amount. (3) Reverse striking fork, the operating surface of which has been concentrated into two diametrically opposite pads, the radial depth being increased same as collars. (4) 1st. and 2nd. speed striking fork and operating collars modified similarly to reverse. We understand the Expl: Dept: consider that to lock gears in mesh while tightening shaft nuts is likely to lead to damaged teeth. We therefore ask that on the rear end of the 2nd. Motion shaft a slot be milled across at right angles to the split pin holes .250 wide and .300 deep for holding purposes. We would also point out that we do not wish to abandon the R.H. and L.H. thread on this shaft. AJS. | ||