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).
Ordering, testing, and observed performance of bulged fabric engine couplings.
| Identifier | ExFiles\Box 74\3\ scan0066 | |
| Date | 26th November 1928 | |
| X4191 OY8.R.11.26.28 November 26th, 1928. TO: Mr. Beaver Mr. Bailey(England) Mr. Hives (England) cc Mr. Nadin Mr. Poole Mr. Ainsworth Mr. Caswell Mr. Ross Mr. Wilkinson Mr. Burton FROM: Mr. Olley ENGINE COUPLING - SECTION 6020 Prop. Sheet #108. Bulged Fabric Couplings Mr. Cowen writes that England have no objection to the bulged fabric coupling but suggest restricting the quantity ordered until we know a little more about the behaviour of these bulged fabric discs in actual use. As you know we have been delayed in ordering by a patent difficulty but now have 300 on order and expect early delivery. From the comments attached to Mr. Cowen's letter the following points should be noted. (1) Mr. Hives promises test of bulged fabrics within a few weeks. (We should send 6 of our newest shipment when received.) (2) Mr. Bailey thinks that possibly the bulge may make the fabric more rigid torsionally and may therefore make the coupling more capable of transmitting to the car the vibration which it is designed to avoid. We have no figures on relative torsional stiffness. Presumably Mr. Hives will make these tests in connection with his work on the bulged fabrics. By.{R.W. Bailey - Chief Engineer} further suggests in a later note that the core of rubber in the bulge may be found to compensate for the bulged shape and actually make the new type more flexible than the old. I would like to suggest that tests be made by Hs.{Lord Ernest Hives - Chair} both on unused discs and on discs which have run for some distance. Run Out Due to Damaged Disc. We have observed on certain cars after considerable mileage with the plain fabric coupling that there are signs of the coupling shaft touching the bore of the clutch brake sleeve. This implies a run-out of about 1/8", at the coupling-disc. But the maximum run out observed when idling has been perhaps .030", and this has been due to collapse of the fabric in one of the compression sectors. -continued- | ||