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 improvements for the rear spring front anchorage.
| Identifier | ExFiles\Box 14\8\ Scan294 | |
| Date | 2nd March 1931 | |
| DA.{Bernard Day - Chassis Design} HS{Lord Ernest Hives - Chair}) FROM R.{Sir Henry Royce} BY (At Le CanadelHenry Royce's French residence.) SECRET X7380 R2/M3. 2.31. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} C. to E.{Mr Elliott - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} HY.{Tom Haldenby - Plant Engineer} JAPAN 3. REAR SPRING FRONT ANCHORAGE - N. SCH. 3201. X. 5410. X. 7380. If we are making new dies I think that we could find a much simpler design. (1) The first idea is to use 4 bolts instead of 6. by bringing the tube a little lower and the bracket higher. (2) The oiling connections should be central and simpler - (they spoilt my sleep.) (3) Cross member tube - you ask for a long boss on the flange because the tube is cut .750" too short - i.e. lengthen the tube and shorten the boss is more economical. (4) The cross tube flanges could be forged in pairs (to balance) so that they could come down to the lower bolts of the spring bracket and so make a strong job with 4 bolts. (5) Personally I should like to see the bracket made of a rather heavy forging of inexpensive steel and a rough milling cut taken in its back to make it this [drawing of a stepped profile] section in stead of this [drawing of a T-profile]. It would be more satisfactory in forging and when finished, but perhaps I do not know enough. I have sketched it on part of your blueprint, which I enclose (to DA.{Bernard Day - Chassis Design}) (6) I have telegraphed that we must simplify central oiling even if it wastes a little more oil. In this part I should bring the main pipe line to the fixing spring pin and use a close fitting bush at each end of the solid spring eye. The space between the ends of the bushes would have pipe line pressure, a pipe from the middle of the leaves middle of the boss to continue the pipe line on theaxle. To oil the spring leaves we can introduce a restriction so that only a small amount of oil goes to the leaves, whereas the full free pressure goes on to the axle. If you and Derby are not satisfied with this, and can think of something better, why do: I shall be delighted. Also examine your competitor's work and see if he has a better scheme than we can suggest. We must realise that we are only one against 50., and some are quite specialists at only a few parts. R.{Sir Henry Royce} | ||