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).
Responding to criticism about starter motor bearing lubrication, proposing the addition of an oil hole with an accompanying sketch.
| Identifier | ExFiles\Box 64\2\ scan0035 | |
| Date | 11th February 1927 | |
| Y7625 To BY.{R.W. Bailey - Chief Engineer} from AJS. c. to EFC. AJS2/M11.2.27. EAC.7. STARTER MOTOR (SLIDING ARMATURE) X.7625. In reference to BY/RD's criticisms in BY/RD3/ML 3.2.27., we always welcome comments of this kind, and deal with the points mentioned in his memo. as hereunder:- (1) We quite realise all that is said in this, and it was considered that sufficient grease would be in the ball bearings to last them for a period equal to that between general overhauls of the whole car, as the starter motor is used for such a very short total time. The plain bearing it was our intention to make of graphitic bronze or self lubricating metal; perhaps we have omitted to mention this on the drawing. In view of what RD. says about being open to criticism it will probably be worth while to have an oil hole, which is the simplest way of providing a means of lubricating the bearing, and is not likely to get stopped up with carbon dust except after extremely long intervals, and if arranged as shewn can be readily cleaned. Sketch hereunder indicates the oil hole referred to. [Diagram 1 Text] Should break out clear of shaft to allow cleaning. .156 hole [Diagram 2 Text] The oil hole is situated between two bosses for screws securing brush holder which looks outward and upward from the engine. Use this method of preventing bush rotating. drilled hole .062" split pin driven in below surface of bush. | ||