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).
Development and proposed testing of a new style of wheel stud for heavy-duty use with twin wheels.
| Identifier | WestWitteringFiles\C\March1919\ Scan8 | |
| Date | 14th March 1919 guessed | |
| To BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} -2- El/G14319 Contd. R.R. style of stud has therefore been evolved, which should be much more easy to make, and which at the same time, should be stronger and less liable to fail under the heavy duty imposed on the studs by the use of twin wheels. It will be necessary to verify experimentally that these conclusions are correct, and for this purpose a revolving test should be made, using a rig somewhat similar to that shewn on Lec.1063. The sketch is self-explanatory. Since the principal load to be met is in the plane of the wheel, excessive overhang is not required on the rig. The direction of motion of the test rig should be such as to tighten the detachable wheel nut. For test purpose three Michelin pattern studs should be prepared, one having a heavy drive fit on the collar, one having a fit very carefully produced to represent the average effect obtained from reasonable limits, and the remaining one definitely clear on the collar and stem diameters. These should be tested against the R.R. style with back nuts very tight, and half tight. All of these tests should be carried out for the twin wheel stud, and the average tests for the single wheel stud. The epicyclic action due to the revolving load, tends to affect the stud in its hole, as well as the detachable nut, and these effects should be carefully watched. It is for this reason that the back nuts might require right and left hand threads, as well as the detachable nuts, although it would be generally assumed that the back nuts would be tightened up to a degree in excess of the load, where the effects which create the | ||