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).
Mechanical jamming issue, proposing solutions like a disengaging radius and backed-off teeth.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan071 | |
| Date | 26th January 1929 guessed | |
| -3- Contd. It will be remembered that the disengaging radius was provided largely as a means of overcoming the engaging jam which we had observed previously when disengaging edges were sharp. It appears possible that the provision of the radius may have eliminated an engaging corner jam and at the same time introduced the jam now described. It further appears that the provision of backed-off teeth would not only be a cure, as suggested by E.{Mr Elliott - Chief Engineer}, for the engaging corner jam but would also be a cure for the type of jam now described. We are, therefore, urging the production of a backed-off pinion so that we may try it on this rig at the earliest possible moment. At the same time we are asking for a pinion in which the teeth are left sharp on both engaging and disengaging corners so that we may prove, if possible, the above possibilities, by actual further observation. We know from actual observation of the old No.1 scheme that an engaging corner jam is a definite possibility though we have not at present a clear case of actual observation of this when a jam has occurred on the present scheme. We can only infer that it must have been the case because jams did occur when we had teeth with all edges sharp and it seems out of the question with the present case that this new type of jam could, in those circumstances, have been possible. Perhaps it should be remarked that we are only speaking of initial failure to engage and that so far as we have done with experiments on this rig we have invariably been able to effect engagement with normal supply voltage | ||