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).
Piston ring design to manage wear through unequal surface pressure.
| Identifier | ExFiles\Box 66\1\ scan0019 | |
| Date | 8th March 1925 guessed | |
| contd :- -2- E.{Mr Elliott - Chief Engineer} will understand my sketch. You will also remember that the idea of bevelling the ring or any scheme for unequal surface pressure, will wear wrongly. It has occurred to me that a way to get this result is to put two narrow rings in one groove, one - the lower - being stiffer, or have more cut out, so that its pressure on the cyl. walls shall be greater than the upper one, and so scrape downwards. The stiff or extra loaded ring will wear faster but can feed the wear for a considerable time. R.{Sir Henry Royce} | ||