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).
Outlining seven suggested tests to improve the Goshawk Bendix drive arrangement.
| Identifier | WestWitteringFiles\K\August1923\ Scan25 | |
| Date | 28th August 1923 | |
| TO EP.{G. Eric Platford - Chief Quality Engineer} FROM R.{Sir Henry Royce} c. to GJ. c. to HS.{Lord Ernest Hives - Chair} c. to HY.{Tom Haldenby - Plant Engineer} ORIGINAL R2/M28.8.23. RE. GOSHAWK BENDIX DRIVE. X3592 Referring to memo. BYL/P24823., I believe the Bendix that I condemned was wrong either in proportions of the design or in fit. Mr. Hives thinks it possible that it was seized on the shaft. We do not believe we have made the best of the Bendix arrangement. To test if we can improve the Bendix we suggest:- (1) That the threaded sleeve is free on the motor spindle. (2) That the threaded sleeve has the best angle of thread, and possibly 4 starts instead of 3 so that the number of revs. will be less before the engagement will be completed, resulting in less shock. (3) That there is sufficient end clearance for the sleeve, that is, between the sleeve and the hub anchoring the end of the spring. (4) That the pinion when it is thrown out strikes against stops on the sleeve having normal faces. (5) That the main torsion spring is as torsionally flexible as we can safely make it. We believe that the torsion is say 500 inch lbs divided by gear ratio of 8, or about 60 inch lbs. (6) Whether it would be better to use other springs for the end pressure. (7) That there might be better provision for lubricating the sleeve on the motor spindle, such as drilling up the shaft and injecting oil in the shaft end. (1) | ||