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).
Improved spring drive for the Goshawk engine, referencing drawing Lec 1665.
| Identifier | WestWitteringFiles\J\December1922\ Scan44 | |
| Date | 30th December 1922 | |
| TO BY.FROM E.{Mr Elliott - Chief Engineer} c. to CJ. [strikethrough]WOR.{Arthur Wormald - General Works Manager}[/strikethrough] c. to HS.{Lord Ernest Hives - Chair} [strikethrough]EP.{G. Eric Platford - Chief Quality Engineer}[/strikethrough] [STAMP] Hs{Lord Ernest Hives - Chair} JAN 2 1928 RECEIVED [/STAMP] [STAMP] ORIGINAL [/STAMP] [Handwritten] X4222 [/Handwritten] [Handwritten, strikethrough] X4221 [/strikethrough] [STAMP] IMPROVED [/STAMP] GOSHAWK I.I./SPRING DRIVE. In accordance with Mr. Royce's recent memo, we send you herewith drawing No. Lec 1665 shewing an improved spring drive for the Goshawk. This is intended to be used in conjunction with the existing crankshaft, existing crankcase, and existing wheelcase. It also uses the existing slipper flywheels, and securing and withdrawing nuts on the crank end. In operation this spring drive should be an improvement over anything we have had before. It should be better than the 40/50 in-so-far that it has absolutely no slack in half the damping for the spring drive, and absolutely no end play. As the speed of the engine increases the end thrust of the crankshaft pinion [handwritten insertion]tends[/handwritten insertion] to decrease the damping effect on the spring drive which is rather what we want as it allows us to have a stiff damping effect at low speeds. We have cancelled the cast iron fan drive pulley and replaced it by a pulley made from 2 similar sheet metal stampings placed back to back. This should be a great improvement as regards reliability, cost, and weight. The spring driving jaws on the crankshaft pinion have been carried out in rather a new way which allows of easier manufacture and saving in cost. The pressure plate for the damping device is intended to be an aluminium die casting in piston alloy. The complete slipper flywheel spring drive and crankshaft pinion has to be placed on the crankshaft as a unit, but we think you will be able to see the correct meshing of the teeth at the moment of engagement by looking down in between the flywheel and the camshaft gear-wheel. (1) | ||