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).
Technical notes on axle components, including sealing, lubricants, efficiency, and gear design.
| Identifier | ExFiles\Box 114\1\ scan0108 | |
| Date | 24th March 1937 guessed | |
| (sheet 2) (9) Oil sealing by bellows type gland with bronze sealing washer rubbing on inner race of roller journal bearing with external Perfect circle seal to act as extra safeguard, and keep out dirt from bellows cavity. (10) E.P. lubricants in general no advantage on worm axle, but moderate E.P. such as Shell-Spirax the best lubricant found. This oil consists of mostly mineral with rape, and some E.P. (11) Efficiencies. Efficiencies quoted for operation on top gear 93% to 96%. Efficiency under worst conditions under bottom gear, engine revs 200, 87%. Maximum permissible operating temperature of axle 90°C. (12) David Brown's claim that the straight worm is quite equal to the load carrying capacity of the Globoid or Lanchester, and that there is considerable technical support for this contention. In practice it is very much easier to manufacture, assemble, and maintain. The curvature of the contacting surfaces is said to be ten times that of hypoid bevel. E.{Mr Elliott - Chief Engineer} * Worms in Nitralloy are of no use with bronze wheel, but satisfactory with Duralumin. | ||