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).
Alternative designs for valve gear rocker bars and their mounting.
| Identifier | ExFiles\Box 43\3\ Scan130 | |
| Date | 2nd February 1927 | |
| 1153 +4003 To E.{Mr Elliott - Chief Engineer} RG.{Mr Rowledge} Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} R5/M23. 2. 27. c. to BJ. WorMBY. RR. F.10. VALVE GEAR. X.3822 Lec. 2383 X.4003 I agree that rocker bars should not be drilled for bolts, and that strength should be sufficient if not so weakened. I prefer that bracket bosses are not split, and I don't like small steel clip in sch. (2). I do not like drilling end one: I should prefer :- (a) collar and threaded end, ) taking care (b) conical end and nut, ) not to burst (c) split taper bush, collar and nut.) bracket. SEE ORIGINAL FOR SKETCHES. Would slow taper end and nut each side of bracket do? Finally, unless you can suggest something better it seems that collar with key-way to register and prevent turning is the only possible satisfactory way. We could have conical seat if preferred, nut could also be coned and locked with plate washer of bent type, or plate fastened with bolt nut and spring washer: only needs to be taken apart for cleaning oil holes. Owing to the alteration to the cams and the large radius of the rocker surface the horizontal load is much reduced. One thinks that the stresses are now much reduced, and the scheme altogether more reliable. I am very anxious that this scheme is as good as Curtiss or Fiat. There are fors and againsts. What is the opinion of RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} and Hs.{Lord Ernest Hives - Chair} Theirs require two camshafts, and is not happy if one valve is set later than another, or one valve spring breaks. R.{Sir Henry Royce} | ||