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).
Test results on spring shackles and bushes, recommending the use of hardened surfaces.
| Identifier | ExFiles\Box 49\3\ Scan153 | |
| Date | 9th September 1922 | |
| Da. {Bernard Day - Chassis Design} from Hs. {Lord Ernest Hives - Chair} c. to EY. X4261 Hs {Lord Ernest Hives - Chair} 2/LGl1.9.22. SPRING SHACKLES, BUSHES ETC. X4261 X2628 Our tests have shown that to get the best results from spring shackles and bushes, we should use hardened surfaces throughout. We should use hardened bushes, in place of the phosphor bronze. We have not found any advantage in using floating bushes in the springs. We prefer bushes made in halves with a flange formed on them to give increased surface for side thrust and also to enable hardened surfaces to be used on all rubbing parts. We find that the lubrication grooves are an advantage. We do hope you will be generous in your propor-tions of spring shackles for the new car. Every single car which comes in to our Repair Shop for repairs has to have the spring shackles, pins and bushes replaced. On the Goshawk we can only run about 5,000 miles before rattles start due to side clearance. We have not yet had a prolonged test on those with all hardened surfaces. On the 40/50 with cantilever springs, the rear shackles have comparatively little wear except wear due to sideways movement. Hs. {Lord Ernest Hives - Chair} | ||