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).
Performance and potential design issues with articulated rod pins.
| Identifier | WestWitteringFiles\A\May1917\ Scan3 | |
| Date | 12th May 1917 | |
| To By.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} (Strikethrough) c. to J.{Mr Johnson W.M.} (Strikethrough) c. to EH. ORIGINAL R1/B10:5:17. RECEIVED 12 MAY 1917 3 X.2750 Re Articulated Rod Pins. With reference to your memo By21/G3517, I understand that these are generally satisfactory with engines on test, and the one sent to me is rather the exception. Before believing that the pin takes a permanent set, we think you should obtain further evidence. It would appear that the groove in the middle of the pin is not needed if there is a groove in the brass. No doubt when the pin is in position it may possibly be slightly reduced at each end. This could be ascertained by putting a pin in without the articulated rod. The pin sent appears to have been slightly taper, the coned end being the smaller. We think it is probably that the bush in the articulated rod would tend to be larger at each end, especially in the case of a rise of temperature. If the lubrication was insufficient or the rod was too tight in the centre, there is no doubt that the hard bearing would come about through the centre of the pin getting hot and expanding. We think you had better hand the matter over for Mr. Hives to investigate further. R.{Sir Henry Royce} (Handwritten note) O make it very clear not suggested By us. | ||