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 to Gordon Armstrong Patent Suspension Co. regarding the design of rear dampers and Oyston valves.
| Identifier | ExFiles\Box 152\2\ scan0135 | |
| Date | 9th June 1939 | |
| 1293? Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}3/R.{Sir Henry Royce} 9th June, 1939. Gordon Armstrong, Esq., Gordon Armstrong Patent Suspension Co.,Ltd., Waltham Works, BEVERLEY, E.{Mr Elliott - Chief Engineer} Yorks. Dear Sir, We have started to draw the rear dampers on the lines discussed when Mr. Leslie and Mr. Martindale visited you. It will take a few weeks to get the design in a sufficiently simple form to be fit for your criticisms. We enclose prints of the Oyston valves. We would like them back when you have finished with them. The action of the valves is not very clear from the drawings, but the main valve orifice is formed by the laminal 4 leaving their seat 14. The load is varied by deflection of the plate 7. When the seat 14 moves to the right, greater poundage is necessary to open the valve. If the stroke is prolonged the seat does move to the right, but for sharp impulses the dashpot formed by the space between the plates 8 and 7 and the leak 10 does not allow deflection, and so the main valve load is small. There is free passage for oil through the plate 9. Replenishment takes place between the laminal 4 and the seat 2. A damper having this type of valve situated in the ordinary G.A. position (i.e. discharging from one cylinder to the other and not under the reservoir) should give good results. Needless to say the arrangement would have to be different if the valve had to be double acting. The cheapness of the Oyston valve should appeal to you, and you have a press shop to make the pieces. Yours faithfully, | ||