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 the Bensport engine mounting, including its cross member and flexible links.
| Identifier | ExFiles\Box 86\5\ scan0083 | |
| Date | 27th August 1932 | |
| X222. To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c.c. Sr. Ever. Hs.{Lord Ernest Hives - Chair} DY.{F R Danby} re Bensport Engine Mounting. ------------------------- We have made a drawing for the forward part of the engine mounting, and cross member for same, as shown on print LeC.3175 herewith. This part is so intimately bound up with the engine features that we thought the only way to deal with it was by making a scheme which could afterwards be modified if considered necessary for chassis requirements. The cross member is so placed that the blower can be detached without disturbing the engine, and also the bottom half of the crankchamber. The rubbers can also be changed by dropping the cross member, and the latter operation also facilitates removing the power unit completely from the chassis. The cross member anchorages to the frame are shown forged in one piece which is much preferred to a brazed construction by our shops. We think the engine must be located rigidly fore and aft on account of the clutch operation, and preferably at the front end where the torque reaction and frame dampers will be located. We are scheming in these latter at the moment. The location we have shown consists of horizontal flexible links anchored to the engine by stiff triangular plates cramped under the crankcase top and bottom half bolts, the plate on the steering side having fitting holes and the other having slotted holes to accommodate errors in alignment of the cross member. The fitting holes are on the side where the clutch pull is applied. Since the engine is free to move in any direction laterally within the limits imposed by the rubber mounting we have only clamped the links up with spring pressure at one end and the rubber pressure at the other. With regard to distortion of the frame in the plan view, the ability of the linkage to parallelogram protects it to some extent from getting overloaded and in the limit the plate with the slotted holes would slip. | ||