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).
Design of Michelin detachable wheels for a 40/50 HP chassis.
| Identifier | WestWitteringFiles\C\March1919\ Scan7 | |
| Date | 14th March 1919 | |
| TO RY. from E.{Mr Elliott - Chief Engineer} Copy to RA. " " PH. " " EPC. 2 14th March, 1919. ORIGINAL E1/G14319. X.3482. RE MICHELIN DETACHABLE WHEELS FOR 40/50 H.P. CHASSIS. We send you herewith drawing No. Lec.1063 and drawing No.Lec.1065. The former shews the scheme for the front hubs to suit Michelin detachable wheels, together with some R.R. type studs for holding the wheels. The latter drawing shews the hubs to be used on the back axle, the designs for which we have revised to obtain simpler machining. Referring to your scheme No.355 for the front hub, we noted that it shewed a cap which was too weak to take the inward slurring load of the wheel, and shocks due to bumping sideways againts ruts or curbs. The hub cap shewn on Lec.1063 should be strong enough to deal with this load, which is transmitted through the outer ball bearing. In the event of the hub cap coming loose, the inner ball bearing may be driven on to the sheet metal guard, which would thereby be damaged. To avoid having to lock the hub cap it is intended that the sheet metal guard shall be made strong enough to take the load by means of a solid metal ring sweated in as shewn, and made to fit the radius of the stub axle. The design of the Michelin wheel stud does not seem satisfactory from the point of view of manufacture, since it depends upon a driving parallel fit on the collar, set up in stress to at least the amount of the load. The spherical recesses in the wheel are also not regarded as being very practical. An (Contd.) [Stamped over the main text: RECEIVED] | ||