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 rear spring pivots for the 20 HP and 40/50 HP chassis, focusing on U-bolt retention.
| Identifier | ExFiles\Box 181\M11\ img191 | |
| Date | 1st August 1919 | |
| 40/50 + 7CA To Mr. from E.{Mr Elliott - Chief Engineer} Copy to Mr. " " DA.{Bernard Day - Chassis Design} " " EFC. ORIGINAL x.682 x.2628 x.3524 E8/G1/8/19. RE 40/50 H.P. CHASSIS REAR SPRING PIVOTS. In connection with the design work on the 20 H.P. chassis rear spring pivots, it was noticed that chassis 7 CA is fitted with pivots having short bosses at the bottom, and long "U" bolts with no features for retaining the top part of the bolts in the correct position on the spring - see sketch. An inspection of the standard arrangement shewed a pivot with the boss for the "U" bolt the full depth of the forging. Would you kindly say which is being used for production chassis. The 20 H.P. chassis rear spring is to be made with a special top plate having features for holding the "U" bolts in the correct position, and thus relieving the bolt stems from any bending moment due to any tendency of the upper part of the "U" bolts to move, owing to spring deflection. [Sketch of a spring pivot assembly] E.{Mr Elliott - Chief Engineer} | ||