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).
Page 2 of a letter from Dennis Brothers Limited regarding oil groove design in bearings and its effect on journal wear.
| Identifier | ExFiles\Box 116\1\ scan0066 | |
| Date | 20th September 1927 guessed | |
| - 2 - for attention. Service of this type on bearings having the oil groove round the centre causes wear to take place on the journal on each side of the oil groove, while that part of the journal immediately under the oil groove is left at the original diameter. In cases where proper facilities are not present for re-machining the crankshaft, the work of truing up bearings of this type is quite considerable, and we have had comments by customers you have stated that a diagonally cut oil groove would prevent this trouble, and at the same time not impair the efficiency of the bearing. It has been our practise to use oil grooves of this type for some fifteen or sixteen years, and we usually mill a slot in the journal so that the slot will cover the full travel of the oil groove, and thus ensure an adequate oil supply to the big end bearing. Yours faithfully, DENNIS BROTHERS LIMITED. [Signature] ENC. P.S. We presume that you have seen the interesting article in the September issue of the S.A.E. Journal on "Automotive Bearing Material and their Application" by A.F. Underwood. | ||