Technical memorandum detailing design changes and considerations for gearbox components including oil scoops, synchromesh cones, and actuating rings.
| Identifier | ExFiles\Box 8\11\ 11-page075 | |
| Date | 22th March 1937 guessed | |
| (2) supplied by the scoop. Similar holes are shown in the 3rd speed driven gear. We should like tests made to determine whether these holes supply oil under all speed conditions. We know that the scoop on the Phantom III does not supply oil under 1500 r.p.m. so that if the holes supply oil only at low speeds they will be of value in conjunction with a scoop which supplies oil at high speeds. Should the holes supply oil at all speeds the scoop can be dispensed with. The characteristics of the scoop should also be determined as they are likely to be different from those of the Phantom. (7) The synchromesh cones are each secured to the outer members by four countersunk head bolts of .1875 diameter instead of six .156 bolts. The .1875 diameter bolts are identical with those used on the Phantom III. (8) The reverse shaft bushes are to be of forged aluminium alloy RR.56 as suggested by the works. This cancels the instruction given in E {Mr Elliott - Chief Engineer} /HDY. {William Hardy} 1/HP.22.2.37 to make these bushes of steel white metal lined. (9) The hole for the taper pin for the oil scoop is shown drilled right through, and not made blind as shown on GL. {G. Linnett} 835. (10) Standard nuts are used on the shafts. We show the 2nd speed actuating ring as recently instructed by N.Sch.5048 to be made in cast iron, but the Efficiency Department have now suggested die-cast aluminium bronze for the ring, and steel for the stirrup, and our impression is that this is likely to be the most satisfactory arrangement. There will not be any need to increase the width of the stirrup when in steel, of course. E {Mr Elliott - Chief Engineer} /HDY. {William Hardy} | ||
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).