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 hub designs, axle nuts, and the need for directional threads.
| Identifier | WestWitteringFiles\C\March1919\ Scan9 | |
| Date | 14th March 1919 guessed | |
| To BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} -3- E1/G14319 Contd. the epicyclic action do not exist. We do not know what Michelin practice is with regard to this point, but the safe and complete policy is to fit right hand and left hand threads to the back nuts as required, and this should be done. Referring to the back hubs, two alternative styles of hubs are shown for both twin wheels and single wheels. It is considered that designs "C" and "D" are superior to "A" and "B", and the former should therefore be followed. They are easier to machine and perhaps rather lighter. The axle tube nuts which screw on after the outer ball bearings, and which have right and left hand threads, according to the side of the car on which they are used, should be clearly marked with their direction of tightening and slackening, as shown on Lec.1065. The driving coupling which connects the driving shaft with the hub should have holes in its web whereby it can be with-drawn for the purpose of getting at the axle tube nut. Kindly send us filing blue prints of Lec.1063 and 1065 as soon as possible. E.{Mr Elliott - Chief Engineer} | ||