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).
Investigation into the breakage of an annulus, with proposed solutions and manufacturing suggestions.
| Identifier | WestWitteringFiles\B\August1918\ Scan1 | |
| Date | 13th August 1918 | |
| To BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} Copy to Ed.{J. L. Edwards} " " WOR.{Arthur Wormald - General Works Manager} " " EH. AUG 16 1918 ORIGINAL RECEIVED 13th August, 1918. R8/G13818. 5 X 3358 X 3360 RE BREAKAGE OF ANNULUS. X 3361 We are of the opinion that this may be caused by want of rigidity of the annulus, permitting it to be bent in the rim until it breaks. We cannot believe a tooth falls out of this, it appears more likely if a tooth were to break it would be in the large planet gear which is much weaker than the tooth in the annulus. We think the hydraulic tackle test might enable us to measure the distortion of the annulus when subjected to a good torque, by having round its surface a ring from which measurements could be taken. Mr. Elliott has suggested that we endeavour to get a wrought steel pot for the casing of the gear in the part between the crankchamber and the sunwheel anchorage. This would enable us to put a little more strength into the annulus and in the event of a breakage, would at least prevent the gear from coming adrift so quickly. It is, however, a very difficult piece to make as a steel forging, and would appear only capable of being made from sheet steel as a hydraulic pressing either hot or cold. It would be just the kind of job for Sankeys to do, and I should be glad if you would get into communication with them to see if it can be produced economically. The thickness would be in the neighbourhood of 3/16" - something like the motor-car frame pressing. The necessary rough dies of circular dimensions would not be expensive. (Contd.) | ||