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).
The design of the Wraith II front suspension lower triangle levers and yoke piece bearing.
| Identifier | ExFiles\Box 8\7\ 07-page08 | |
| Date | 30th June 1936 | |
| To BT.{Capt. J. S. Burt - Engineer} Copy to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RRG Hs{Lord Ernest Hives - Chair}/Lee. KLOTZ 622 LES- E/EV.{Ivan Evernden - coachwork}2/MN.30.6.36. [Signature] Wraith II Front Suspension Lower Triangle Levers and Yoke Piece Bearing. We send herewith N.Sch.4845 showing the Wraith II lower triangle suspension levers and lower yoke piece bearing. This lower bearing has been made spherical so that the whole of the torque on the yoke piece may be taken by the upper triangles, and quarrelling may be avoided. The sphere is made of case hardened nickel steel, and the bearing pads of bronze. The front pad is a press fit in its housing, and the rear pad a sliding fit. A load of 200 lbs. is imposed on the pads by means of a spring. Should it be found as a result of experiment that it is necessary to prevent the rearmost pad from turning, a scheme will be provided for this. As this joint is at the end of the oiling system and under gravity feed it is thought that felt washers will be adequate for oil retaining and water exclusion. Oil grooves are cut in the bearing pad. The design has been so arranged that one common forging is used for all four of the lower triangle lavers. The bump rubber stop has been designed so that no load is imposed on the fixing bolts, so lightening the construction. Ev.{Ivan Evernden - coachwork} Att:N.Sch.4845. | ||