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).
Front engine mounting designs, comparing rubber mountings and proposing an alternative blueprint.
| Identifier | ExFiles\Box 2\10\ 10-page07 | |
| Date | 13th October 1932 | |
| - 2 - A further blueprint is attached, Lec.3241, showing a form of front engine mounting in which the dampers to the crossmember are deleted. The weight of the engine is taken by a pivot, and the rubber, carrying torque only, is brought out to a position where the loading would be light, and the rubber more accessible. The present design of rubber mounting on J.3. and Peregrine does not seem to meet with much favour. The torque carrying rubbers which are rather near the centre have to be very hard, and the flanges on which they rest have become distorted. Some of this distortion may be due to the initial assembly. Another point that is raised is that the position of the engine is somewhat uncertain. The ability of the engine to vibrate more or less round its own centre of gravity at the front end is no doubt an advantage, but this degree of freedom was tried on and off in connection with the rear end of Phantom II. and the difference could not be detected. We have, therefore, put forward Lec.3241 as an alternative mounting which may be worth considering. The relative position of the pivot and torque carrying extensions can be easily ensured by the use of a jig in drilling the crossmember, as also those of the housings on the engine pivot member. It is feared that you do not like loading the rubber in the manner indicated, but with both rubbers in action the loading is light and the method appears convenient for production, assembly and accessibility. Full particulars of the diagonal links locating the engine endways are shown on another scheme to follow, which scheme deals with a proposed permanent design for separate torque dampers should it be decided that these latter are required. E.{Mr Elliott - Chief Engineer} | ||