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).
Letter from Ferodo Limited discussing the use of an elastic layer between clutch linings to prevent juddering.
| Identifier | ExFiles\Box 26\4\ Scan404 | |
| Date | 9th November 1929 | |
| FERODO LIMITED. X34 27. x719 WIRES: "FRICTION, PHONE, CHAPEL-EN-LE-FRITH." TELEPHONES: 19, 20 & 21 CHAPEL-EN-LE-FRITH. (3 LINES) Depots. LONDON 222, TOTTENHAM COURT ROAD, W.1. BIRMINGHAM 202, CORPORATION STREET. MANCHESTER 32, CATHEDRAL STREET. LIVERPOOL 1-3, BERRY STREET. GLASGOW 65, BOTHWELL STREET. BRISTOL 19, PARK STREET. BELFAST 158, NORTH STREET. LEEDS 25, HUNSLET ROAD. BRIGHTON 84, QUEEN'S ROAD. NEWCASTLE-ON-TYNE WORSWICK ST, PILGRIM ST HASLAM & STRETTON LTD CARDIFF. 11, WINDSOR PLACE. NORTH MIDLAND COLLIERIES, CHESTERFIELD. DUNSTON HALL. MESSRS F.W.HARRIS & CO. STOKE ON TRENT MOORLAND ROAD, BURSLEM. MR SIDNEY HILL, COVENTRY. 1, QUEEN'S ROAD. NORTHERN MILL & MINE FURNISHING CO. CARLISLE. ANNETWELL STREET. Foreign Factories. FERODO AND ASBESTOS INC. U.S.A. NEW BRUNSWICK, NEW JERSEY. LA{L. A. Archer} SOCIETE ANONYME FRANCAISE DU FERODO, 2, RUE DE CHATEAUDUN, PARIS. DIE DEUTSCHE FERODO GESELLSCHAFT, BERLIN. MARIENDORF. (LOPKEN & CO) GROSSBEEREN STRASSE, 126. CODES: 5TH EDITION A.B.C. LIEBER'S. MARCONI INTERNATIONAL. WESTERN UNION FIVE LETTER EDS. Regd Office & Works SOVEREIGN MILLS, CHAPEL-EN-LE-FRITH, VIA STOCKPORT. ENGLAND. All Communications to be addressed to the Company and not to individuals. PLEASE ADDRESS YOUR REPLY. DEPT. REF. FJF/LED. YOUR REF. Hs{Lord Ernest Hives - Chair}/Tsn8/AD. 9th November, 1929. Messrs. Rolls Royce Limited, Nightingale Road, DERBY. - For the attention of Mr.S.S.Tresilian - Dear Sirs, By sheer accident we have not replied to your esteemed letter of the 1st instant, and ask you to accept our apologies for our unfortunate omission. In regard to your suggestion of interposing an elastic layer between the linings and the carrying plate, the device so far as making up presents no difficulty, and we could cement a sheet of untreated asbestos or other slightly resilient material, to Ferobestos or Ferodo Bonded Asbestos, but the anti-judding effect is very much open to question, and we doubt its effectiveness. But if you would like to try out the arrangement we shall be glad to be of assistance. We suggest cork, asbestos or felt, but feel that unless the underlying fabric is reasonably thick, the cementing medium will penetrate slightly and harden up the layer, which can hardly be more than 1/16" thick, unless you are prepared to increase the overall thickness of the linings. For example, the lining itself and the elastic layer may each be 1/8", giving a total thickness including the plate, of about 0.62". The lining will have to be riveted to the plate - otherwise in the moulding process the cementitious matter will penetrate the softer material and remove any elasticity it may possess. Frankly, we do not consider that the object you have in view will be achieved, and if juddering cannot be eliminated by the ordinary methods, we suggest the best way to deal with it is to increase the spring pressure and lubricate the clutch. We make a fabric lining for this particular purpose, and we can assure you it is absolutely effective. Yours faithfully, FERODO LIMITED, Chief Engineer. | ||