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).
Gearbox testing detailing issues with gear meshing, component damage, and proposed design modifications.
| Identifier | ExFiles\Box 6\4\ 04-page077 | |
| Date | 23th February 1925 | |
| -2- AJS1/DB.{Donald Bastow - Suspensions}23.2.25. Contd. 1.Contd. driven from the erecting to the Test Dept: On dismantling it was found that the amount of out of mesh of the gears coincided with the amount of angle through which the change speed lever had turned on its spindle. 2. The out of meshing as described in No.1. had the effect of creating a bigger bending moment on the reverse spindle, and therefore causing a bigger angle of deflection. 3. Owing to the teeth not being fully in mesh (they were something over .3 out), they would be deflected to form an inclined plane which might cause a slight creep out as the teeth came into gear. 4. We had arranged the centre of tooth pressure to be symmetrical about the splines under them, and this would not be so with the teeth partly out of mesh. In order to get the experiment moving quickly, the "large wheel" was one that had been slightly damaged in a previous experiment, and this, in conjunction with the increased unit pressure would probably cause the bad bedding. We are now re-assembling the box with a new "large wheel" and reverse pinion, and which we expect to be on test about Mid-day. As far as the design of these pieces is concerned, we propose to add some simple feature which would indicate the position up to which the pinions have to be screwed on to their sleeves in the box, after the position has been first determined externally. AJS. | ||