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 detailing crankshaft lubrication requirements for chassis and aero engines.
| Identifier | ExFiles\Box 65\4\ scan0228 | |
| Date | 25th April 1928 | |
| H.s from R.{Sir Henry Royce} c. to BJ. BY.{R.W. Bailey - Chief Engineer} RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} X 8010 RL/M25.4.28. CRANKSHAFT LUBRICATION - CHASSIS X.5010 AND AERO ENGINES. X.8010 X.3865 X.2176 We expect the oil feed to be on all seven bearings. We expect the shaft to be plugged in Nos. 1, 2, 3. and 5, 6, 7. journals. XX We expect the feed journals to be drilled in 3 places at 120°, and we think it would be better to commence with dowels that do not go through. It is desirable to keep clear of bearing joints with the oil pressure. We require 2 oil feed holes, through the lower half of main bearing bush 60° apart, and fed by a groove in the cap. With this we get 6 jerks of feed pressure per rev. The intermittent oiling should have separate feeds as in Lec.2545 so that one big end cannot rob the other one. It is desirable to have intermittent feed because we do not then have to put in long grooves. This scheme possesses the max. of reliability with the minimum of leakage. It does also for aero engines. The oil feed tubes in the crankshaft should be fixed as shewn on Lec.2545. If it is found that more oil feed is necessary the feed holes in the bush should be extended by grooves. On the little ends of the conn. rods on all engines we are trusting to splash plus some oil taken from groove in piston. A further drg. Lec.2550 - illustrating the above remarks in connection with the oil feed and bearing dowels. We cannot use on car work with the short bearings oil above 25 lbs. at present. R.{Sir Henry Royce} | ||