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).
Letter to M. Wilks of The Rover Company regarding materials and angles for synchromesh cones.
Identifier | ExFiles\Box 127\3\ scan0209 | |
Date | 23th March 1938 | |
1091. Rm{William Robotham - Chief Engineer}7/R.{Sir Henry Royce} 23rd March, 1938. M.{Mr Moon / Mr Moore} Wilks, Esq., The Rover Company Ltd., New Meteor Works, COVENTRY. Dear Wilks, With reference to your query on the telephone regarding the material used for synchromesh cones, I find that we have tried Phosphor Bronze and Cast Iron, but not Aluminium. The Cast Iron cones wore away too quickly, and we are not using them as standard. The Phosphor Bronze cones wear remarkably well; in cases, however, where the fine screw thread has been removed due to mal-treatment, we have not found that the efficiency of the cone has been materially reduced. Generally speaking, the screw thread is to enable the cone to bed in when new. We are at present using cones with 8° angle. We have used a cone with 5½° angle, but this had special release mechanism, with this type it behaved quite satisfactorily. Cones will not work if an E.P. oil is used in the gearbox. Yours faithfully, For ROLLS-ROYCE LTD. | ||