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 to an S.S. Sequence Starter, focusing on spring pressure to resolve engagement issues.
| Identifier | ExFiles\Box 64\4\ scan0151 | |
| Date | 22th December 1928 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. EY. Wor.{Arthur Wormald - General Works Manager} X7655- EFCL/T22.12.28. S. S. SEQUENCE STARTER. We do not now have the trouble of not returning from a corner jam. In regard to failure to engage on first or subsequent application of pressure to the push button, we expect to realise improvement in this respect by reducing the jump back spring progressively - (a) Two turns removed. When tried, showed some improvement. (b) One more turn removed. (c) Further turns being removed, until the set of the spring is nearly zero. In case (a) the initial force on the spring is still greater than the armature end pull in the position of just engaging. In case (b) it would appear to be just less. We appreciate your idea that if a the spring could compress after first tooth contact on ends, the armature could go on 'screwing' into engagement, whereas if the pinion would not compress, the friction of the end pressure might prevent rotation and subsequent engagement. A further experimental variation which we are arranging is to make the switching operation occur much earlier in engagement than at present, e.g. just after half engagement. Application of the main current, as already pointed out, does not apparently increase, but appears to reduce the engaging end thump with these parallel teeth, partly owing to the frictional resistance introduced by the pressure set up between the teeth. Contd. | ||