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 modifications to the wearing plate on the rear spring.
| Identifier | ExFiles\Box 171\3\ img085 | |
| Date | 13th December 1920 | |
| By 3/P13.12.20. RE WEARING PLATE ON REAR SPRING. (A) Owing to the change from the split type of plate to the solid type of plate, the wearing surface has been considerably reduced between the spring and the roller. (B) We have always fitted wearing plates in the position indicated, and the design for this, as a whole, has not been seriously interfered with - the following points only having been modified.- 1. The width of the plate has been increased to ensure that the wearing plate will bear on the roller flange instead of the spring. 2. The thickness of the plate has been increased so as to increase the wearing surface. 3. In the old design the plate was thinner and was actually narrower that the spring, and therefore the two modifications above increase the wearing surface very materially and replace a soft wearing surface by a case hardened one. (C) It might be supposed that the whole trouble could be overcome by insisting on having the width of the rear springs maintained within narrow limits, but this is not the case, owing to the fact that the present existing roller plate lifts the bottom plate of the spring so high up on to the flange of the roller that there is very little bearing surface left, and if the springs do fit when put on test they will wear slack in the first 50 miles of road running. By.{R.W. Bailey - Chief Engineer} | ||