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 memo with diagrams discussing the design of connecting rods and lifting pins.
| Identifier | ExFiles\Box 182\M20\M20.1\ img012 | |
| Date | 4th April 1924 guessed | |
| (2) Mr. Rowledge and I sent a good cross section which we believed workable. I have not it by me, but DA.{Bernard Day - Chassis Design} sent something about the same; (M.sch: 1782.) here are some more:- Short overhanging pin for connecting rods. If lifting pins are short and pass clear of connecting rods they can be alike and anywhere, and can be pieces left on the forging - i.e. lifting segment. Since connecting rods do not need adjustment (tension only) they could be flat pieces of steel or milled thin in centre as you shew. There is no wear to worry about, the stresses cannot be much beyond those known, so that the enormous pins and areas provided seem to me quite unnecessary. There should be little weight on the floating levers so that lifting pins should be about same angle and (if convenient) rather further out than pins for connecting rods. lifting segment or pins can come to this line. This is supposing we use thin connecting rods as shewn by you, say .15 and stout cobby pins. Do we not require some lubrication? Ball bearings may be required in cross bar to ensure freedom of release. I can see how we must have ample clearance not to catch the connecting rods. Lec. 1861. is hardly well clear of the reverse one. I shew very deep boss to secure overhanging pin and use this to help clearance. My con. rods are well out and may require a little economy elsewhere. We must use the big angle of servo action for the brakes or the friction required is too much for other parts, and also load on the drive. R.{Sir Henry Royce} | ||