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).
Use of liners and bushes for main bearings, referencing blueprints LeC. 2655 and 2656.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan093 | |
| Date | 30th January 1929 | |
| FROM E.{Mr Elliott - Chief Engineer} C. to BJ. HS.{Lord Ernest Hives - Chair} RG{Mr Rowledge} BY MAIN BEARINGS. X399Z Referring to your proposal to use liners between caps and crankcase which do not enter the bushes we think this would be well worth having. Blueprint LeC. 2655. shews the SS.{S. Smith} main bearing with a .100 liner and also with a .150 liner, the latter allowing us to use a larger radius in the corner of the case. Possibly also the thicker liner would be easier to handle. Regarding the question of actually taking up bearings the thinning of the liners by a definite amount is easy but for reducing the faces of the lower half bush some datum for measuring is required. (herewith) Blueprint LeC. 2656./shews that on the intermediate bearing the bush face can be callipered or gauged from the face of the bolt boss, but that the central and end bearings have no convenient datum unless a small abutment be left on the cap each side. This abutment need not be machined, and it is just a question of whether you think it worth while to add it to the duralumin forging. It is assumed that during this operation the lower half bush is firmly clamped in its cap. The bush could of course be dressed off against a gauge in the bore used against a surface but this renders the final position of the dowel hole somewhat uncertain. E.{Mr Elliott - Chief Engineer} | ||