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 F.O. Hickling of Ransome & Marles Co., Ltd. regarding deflection measurements and bearing tests for a Bentley axle.
| Identifier | ExFiles\Box 84\4\ scan0268 | |
| Date | 6th July 1937 | |
| 202 Rm{William Robotham - Chief Engineer}/Gryll/R.{Sir Henry Royce} 6th July, 1937. F.O. Hickling, Esq., Messrs. Ransome & Marles Co.,Ltd., NEWARK-on-TRENT. Dear Hickling, We have taken some measurements of deflections in the Bentley axle. The measurements have been taken at the pinion oil thread in the worst direction under 1st gear torque. On the drawing you have you can see where this is with respect to the thrust bearing. The deflection in the direction of maximum load is .005. The next two experiments were to replace the usual 5MDJT bearing with one having two journal outers, and, secondly, to replace the bearing by a solid brass bush. The reflections were then respectively .003 and .002. The movement of the pinion nose is about .001 in all cases. It would appear, therefore, that a journal bearing followed by an angular contact might reduce the deflection. Could you grind sufficient material off the sides of the normal MJ30 & MJT 30 bearings to fit in the space shown on your S.5595, and send them along for test in our rig ? Increasing the pre-load on the standard bearing by .001 made no appreciable difference. We have not tried any larger amount. When you have had a think round these figures, will you come over and discuss what to do; not Monday or Tuesday next week, and my Monday begins on the 17th. Yours sincerely, | ||