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).
Current status and options for resolving engine coupling and chassis groan issues.
| Identifier | ExFiles\Box 66\4\ scan0130 | |
| Date | 3rd April 1925 | |
| [redacted] from AJS. [redacted] c. to Hs. {Lord Ernest Hives - Chair} 48305 AJS1/DB. {Donald Bastow - Suspensions} 3.4.25. ENGINE COUPLING. SECRET EAC & 40/50 CHASSIS GROANS. The general position of this job at the moment is as follows:- 1. To get an idea of the relative strengths of the size of disc that failed and the one shown on drawing Lec.2050, we intend making some comparative tests on a rig giving alternating direction of torque loads. We expect to get delivery of a few discs on the 7th, inst. 2. Fitting the block coupling scheme to taper ended first motion shaft made for disc, causes undue overhang of coupling. If we do have to revert to this, it will mean using the original type cross pin first motion shaft. 3. If reverting to block coupling in 2, owing to no dynamo pulley, cross pin overhang can be reduced by .200, but this prevents the use of stock shafts. 4. We have examined the design of existing Spring Drive Coupling and find that without the cancellation of or modification to clutch stop, it cannot be fitted to EAC, as the necessity for a removable "slice" means fitting a flange to clutch shaft by means of cone and nut, which takes up end room required. The foregoing includes taking advantage of amount mentioned in 3. 5. If it is decided to adopt the Spring Drive for EAC, the damping springs can be housed in the space required for cone and nut referred to in 4, and held by spring ring when dismantling the "slice". A slightly larger capacity Spring Drive might be possible with this method. 6. A scheme which could be made common to 40/50 and cars with groans, and which might supply just the amount of damping required would be to fit, forward of the rear block coupling, a rubber cushion drive, consisting of a tube internally winged and spindle treated externally | ||