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 from Ransome & Marles Bearing Co. discussing alternative bearing schemes and a reported component failure after a dynamometer test.
| Identifier | ExFiles\Box 114\2\ scan0249 | |
| Date | 13th December 1935 | |
| RANSOME & MARLES BEARING Co., Ltd. - 2 - Messrs. Rolls-Royce, Limited, D E R B Y. 13/12/35. rather on the thin side, we should certainly have preferred a little more metal. Scheme .2. shows another alternative using the same number and size of balls, and therefore giving a six per cent increase in capacity, the main point of this particular scheme being to obtain a greater amount of material on the thrust side of the outer ring, while at the same time avoiding as far as possible modifications to your components. As will be seen with this bearing in place, the only modifications are to omit the oil seal or oil plate in the endcap, modify the nuts slightly and also the flinger. Scheme .3. again shows a bearing with the same number and size of balls and therefore the same increase in capacity, but with a greater modification to your component, it being noted that this bearing is quite straightforward, there being no recesses etc. as in the bearing in scheme .2., while also your components are more in line with your present arrangement. With reference to your remark to the effect that one ball was found to be broken after the dynamometer test, we were certainly not aware of this, but when the bearing was received by us, one ball was missing and we merely assumed that this had inadvertently been lost after it had been taken out of the job. It is therefore very difficult for us to arrive at any conclusion with regard to the broken ball, although certainly with this present the marking on the track would be explained. We have previously mentioned that the bearings shewed no signs of failure from overload etc., and even had the broken ball been in the bearing when received | ||