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 discussing the design of an SS oil filter and strainer in the sump, with suggested improvements.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan161 | |
| Date | 19th February 1929 | |
| R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} ) FROM R.{Sir Henry Royce} (E.{Mr Elliott - Chief Engineer} in R.E. is struck out) BY.{R.W. Bailey - Chief Engineer} ) (At Le CanadelHenry Royce's French residence.) (BY.{R.W. Bailey - Chief Engineer} is struck out) SECRET. ORIGINAL R1/M19.2.29. REC'D AT WW. 23.2.29. C. to SG.{Arthur F. Sidgreaves - MD} DA.{Bernard Day - Chassis Design} (SG.{Arthur F. Sidgreaves - MD} DA.{Bernard Day - Chassis Design} is struck out) SS.{S. Smith} OIL FILTER. STRAINER IN SUMP. X7190 In pumping from the lower part of the filter I do not quite understand what becomes of the air in the upper part. It seems to stay there always. The simplest and clean casting would be to go straight in half way up. My impression is that with the strainer and diaphragm in their present relative positions it would be better to have the inlet to the strainer turned round so as to be nearer the diaphragm. Having reduced the one drainage hole in this diaphragm I believe this is all that it is necessary to do. It will be realised that this is only a safety strainer and not really a filter, so that it is not worth while making it anything but in the simplest form possible. However we always prefer the oil to flow from the outside inwards, and if we could make the inverted one equally simple I prefer this. It would however require the passages in the hood to go over the top, which results in complication and dirty passages (sand from core). I shew in my sketch a design which would be clean and capable of being two die castings: it has one permanent joint. My sketch suggests that the strainer should be close against diaphragm (cross web) with opening on forward side of strainer and an amply large enough return passage curved back nearly to the web behind. If this could be done easily it would be perfect. (1) The easiest thing to do is to turn the hood round. (2) One would also think it easy to move the cross web back. (3) To cast an open gutter and put on a rough cover seems the easiest way to form the return passage. I have no fear about sufficient oil on a steep grade, especially with the extra oil suggested. One in five lasts for only a short time ever. (1) | ||