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).
Design of a double piston shock damper, with diagrams.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan374 | |
| Date | 24th February 1931 | |
| DA{Bernard Day - Chassis Design}/HDY.{William Hardy}) FROM R.{Sir Henry Royce} HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} ) (At Le CanadelHenry Royce's French residence.) DY.{F R Danby} C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} ORIGINAL SHOCK DAMPERS. The double piston that I suggested is not so good or simple as the Delco design because it demands a long close fit. It would however be quite unnecessary to make both of the long studs a close fit. Since in the Delco design neither of the fits need be long it permits 2 simple springs - i.e. one on each stud. It would be necessary to pin the studs for fear they were not put in tightly so perhaps we need not thread them. The stud is centreless ground and pressed into the half piston so as to leave an exact amount standing out. It is then cross pinned strongly enough for the 25/50 lb. spring and the screwing up of the small nut which is split pinned. I should make the piston as light as possible in hard bronze so that no pads would be needed. Owing to the difficulty of examining I would not put the replenishing valves in the piston. All the 4 valves could be in a row and we should like each one to come out with its spring and seating on a screw. The shaft and the inside lever could be pressed together with fine parallel serrations which could be put upon the shaft by pressing it into a disc which had a cutting face. (1) | ||