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).
Patent claim for an 'L' section piston oil scraper ring, discussing its function and origin.
| Identifier | ExFiles\Box 66\1\ scan0036 | |
| Date | 23th March 1925 | |
| *744 +8020 BY/NW.{N. Walker - Patents} c. Hs.{Lord Ernest Hives - Chair} BY10/H.{Arthur M. Hanbury - Head Complaints} 23.3.25. PISTON - OIL SCRAPER RINGS. ------------------------- I am of the opinion that we should put in a claim for a combination involving an "L" section ring with the usual type piston with a groove in front of the ring. The point in regard to the "L" section ring is that the deep section increases the pressure at the lower end, with the result that when the piston is going upwards, the ring acts as a Michell pad, tilting slightly, the tilt being caused by the different pressure per square inch at the leading and trailing edges of the ring. When the piston is rising, the leading edge has the low pressure. When the piston is travelling downwards, the leading edge has a high pressure, the effect being that oil cannot pass the ring in an upward direction, and oil placed on top of the piston is actually pumped down again into the crankcase by the action of the rings. Mr.Lovesay is really responsible at the Works for this suggestion, that is, the "L" section, but E.{Mr Elliott - Chief Engineer} states that Mr.Royce made a similar suggestion many months ago, but it never went any further. Whilst Mr.Royce must, as E.{Mr Elliott - Chief Engineer} states, have conceived the same idea, he did not put it into practice. It was Mr.Lovesay's suggestion at the Works that caused the scheme to take practical form. I therefore think that the patent should be taken out in the name of Mr.Lovesay and Rolls Royce Ltd. BY.{R.W. Bailey - Chief Engineer} By | ||