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).
Improvements to a worm and nut mechanism, including lubrication, thread design, and comparison to a Hispano model.
| Identifier | ExFiles\Box 22\1\ Scan277 | |
| Date | 17th April 1926 guessed | |
| contd :P -2- varies as far as we can see due to the oil being squeezed out. We are sending a suggestion for giving a courser thread so that there may be a better chance of keeping the oil in on account of the longer surface, and also as it seems to us there may be a better chance of polishing the worm . We should be glad of your remarks on this suggestion. We should also be glad if you would say whether you think there would be an advantage in returning to the split nut, the idea being that they can scrape the nut threads to a more perfect bedding. We also make some suggestions for holes leading the oil into the worm more effectively but we are not prepared to say that this is going to be much help. As far as we can see the only direction in which improvement can come is in efficiency of the worm and nut, and all that we can probably do is to help you to obtain this efficiency. It may be pointed out that the proportions and particulars of our worm and nut are very similar to those of the Hispano, of which you sent us a drawing. We believe it has been pointed out already that the very flexible spring on the Hispano side steering tube might have quite a lot to do with the latter retaining its oil film better than ours does. N.schs. 2155. and 2156 attached to EY's copy of this memo. MADE AT CROXLEY DA.{Bernard Day - Chassis Design} | ||