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).
Improvements and proposed modifications to a pinion mechanism, including test results and suggestions for new motors.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan136 | |
| Date | 15th February 1929 | |
| EFC2/T15.2.29. -3- Contd. With this pinion we made a still further improvement in the frequency of operation without failure, by packing back the pinion approx. .080" against its spring by means of a washer; just such an amount which would still allow nearly full engagement of the pinion with the wheel though not in a central position relative thereto. The motion of the pinion previous to engagement becomes approx. .250", in place of 170". The improvement appeared to result from the fact of there being more kinetic energy both longitudinally and rotationally to overcome the tendency to corner jamming. In this arrangement we have arrived at a condition in which we were able to record 400 consecutive trials without a jam occurring, though a very occasional one was possible. Apart from the end thumps this arrangement is reasonably quiet. If we require central engagement of the pinion with the wheel teeth we could call for a slightly increased armature travle, i.e. about .050". We are of the opinion that these slight modifications should be incorporated on the new motors which are being built with the other modifications, e.g. (1) Heavier gauge teazer winding. (2) Parallel armature. (3) Longitudinal damper. in such a way that a return to the existing pinion set-and-distance from wheel is readily possible. Contd. | ||