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).
Technical memorandum regarding modifications and schemes for the J.III Hydraulic Damper.
| Identifier | ExFiles\Box 105\3\ scan0270 | |
| Date | 23th September 1932 | |
| X5520. BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. BY/SS.{S. Smith} c. RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}11/KT.23.9.32. J.III HYDRAULIC DAMPER. Y235. You have now detailed for us - (1) The aluminium case. (2) The Cork and Rubber Gland. (3) The Cheapened Split Piston. We therefore are satisfied that the body of the damper is O.K. for France. (It is proposed to send the first car on Nov.1st This means that this car will run without automatic damper control.) We are therefore proposing to fit the end covers we have tested to N.sch.3497, with a few small modifications. This scheme gives us :- (1) A silent valve with an excellent indicator diagram. (2) A means of applying automatic control which, though we foresee some trouble, will at least WORK. (3) A completely satisfactory scheme for fixed load dampers. N.sch.3497 was made to sketches Ex.9002/3/4/5/6/7/8/9/10. and Ex.9096. These are satisfactory except that - (a) Ex.9002 should be altered so that the hole leading from the valve chamber to the atmospheric chamber is .105" dia. (b) Ex.9009 modified to have a lip width of .250 instead of .100, and a diametrical clearance of .005" The washer to be flat instead of conical to facilitate machining. (c) Ex.9096 should be altered so that the external pressure lubrication comes in behind the cup leather. The groove by-passing the oil from one side of Ex.9009 to the other should be .032 rad. | ||