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).
Testing Michelin wheel studs, including thread direction and preventing wheel creep.
| Identifier | Morton\M11\ img159 | |
| Date | 17th March 1919 | |
| To E.Y. from E.{Mr Elliott - Chief Engineer} Copy to E.H. " " D.A. " " E.F.C. ORIGINAL. X.3482, RE MICHELIN WHEEL STUDS. Please find attached drawing No. Lec.1067 dealing with the question of testing studs for Michelin wheels. Would you kindly find out if possible, if the back nuts on the Michelin wheel studs have right and left hand threads, and if so, how they are applied. An important point in connection with the revolving test is that the part representing the roadwheel must not be allowed to creep, but the means of preventing creep must not relieve the detachable nut from carrying the load. A single dowel pin engaging with the outer portion of the flange should be sufficient for the purpose. In considering a Michelin wheel, say, on the near side of a car, running forward, it will be seen that the wheels turns in an anti-clockwise direction with relation to the observer, while the load W turns in a clockwise direction with relation to the wheel - Fig.1. The effect of this upon the detachable nuts is illustrated in Fig. 2, where it will be seen that the nuts tend to rotate in anti-clockwise direction and therefore require left hand threads, to ensure that they shall remain tight. Referring to Figs (3) and (4) it will be seen that epi-cyclic actions tend to exist between - (a) The stud and flange. (b) The stud and back nut. (c) The back nut and flange. (Contd.) | ||