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).
Best surface material for crankshaft dampers and planning further testing.
| Identifier | ExFiles\Box 138\1\ scan0045 | |
| Date | 8th June 1932 | |
| HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} FROM R.{Sir Henry Royce} C. to SG.{Arthur F. Sidgreaves - MD} C. to WOR.{Arthur Wormald - General Works Manager} C. to E.{Mr Elliott - Chief Engineer} C. to BY.{R.W. Bailey - Chief Engineer} CRANKSHAFT DAMPERS. I spoke to E.{Mr Elliott - Chief Engineer} on the telephone about these. I am very decided that we ought to concentrate on finding out what is the best surface for this purpose. The canvas duck seem to be a failure, and fibre is reported by Derby to be undesirable inasmuch as the friction at rest is considerably greater than the friction in motion, but I think this should be confirmed, and perhaps it refers principally to well lubricated surfaces. We assume that what is right for a dry clutch is right for a dry slipper wheel, and that what is right for a lubricated clutch is right for a lubricated slipper drive. E.{Mr Elliott - Chief Engineer} has suggested the use of metal plates - copper and bronze. The value of such a practice should be easily tested, but one would imagine that the area would have to be large to prevent seizing. Having got the right materials, and whether they should be lubricated or not, the next point for maximum efficiency is to find out with a given wheel inertia the optimistic friction for each of the speeds at which the crankshaft is likely to give any trouble, that is, the speeds from 200 to 4000 should be divided into belts and tested with various degrees of friction for each belt, to give the best results. We should be glad if you would arrange for GRY.{Shadwell Grylls} to work on this until we have got some answer. Perhaps we could get a few suggestions which would help from Mr. Lovesey, as in his earlier experiments he seems to have made some progress towards measuring the angular swing of the crankshaft. R.{Sir Henry Royce} | ||