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 The Cloudsley Engineering Company Ltd. regarding a shock-absorber arrangement with a laminated disc valve.
| Identifier | ExFiles\Box 154a\2\ scan0025 | |
| Date | 20th January 1939 | |
| COPY. 1305 THE CLOUDSLEY ENGINEERING COMPANY LTD. 13 QUEEN ANNE'S GATE. LONDON, S.W.1. WHITEHALL 0054 20 JAN 1939 JLC/MB. 19th January, 1939. Messrs. Rolls Royce Ltd., Derby. Dear Sirs, We enclose you herewith very brief particulars of a shock-absorber arrangement we have developed incorporating a laminated type of disc valve which we have had under test for some time. In the arrangement sent it is shown applied in a particular manner to the usual double-piston type shock-absorber in which a drop arm is positioned between two pistons in opposing cylinders. The piston is provided with a multi-disc valve performing the two functions of recuperating valve and riding valve; a high pressure relief valve is unnecessary. The laminated disc valve is mounted co-axially in the end of the piston between a seat on the latter and a seat on a mushroom-headed valve member, the stem of which fits into a cylinder in the piston to constitute a dashpot. It will be seen that as the piston is moved to the left, the displaced oil will act upon the disc valve and the head of the mushroom valve moving the two together inwardly in the piston. If the movement of the piston is slow, pressure will build up slowly and both the mushroom head and the centre of the disc valve will move to the right until the valve stem touches the bottom of the dashpot, after which the centre of the disc valve will leave its seat on the mushroom head, the control pressure then being the maximum for the particular setting and loading of the disc valve - this feature giving stability on cornering. | ||