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).
Directions from Mr. Royce regarding the design of the rear spring pivot, shackle, and lubrication for the 'Buzzer' cross members.
| Identifier | WestWitteringFiles\E\November1920\ Scan6 | |
| Date | 6th November 1920 | |
| To D4. from E.{Mr Elliott - Chief Engineer} Copy to G4, R.S.C. ORIGINAL RECEIVED NOV 1920 EL/G6/11/20. 3 X.4043 RE "BUZZER" CROSS MEMBERS -N. SCHEMES 393/4/5. With reference to the above schemes, would you kindly note the following which I send in accordance with Mr. Royce's directions:- (1) Dealing first with the pivot for the front end of the rear spring, Mr. Royce would like to know how you are going to change the springs on a chassis if the shackle bolt be turned round in the manner shewn, so that it cannot be withdrawn. He thinks it will be necessary to have the head of this bolt on the outside, and it should then be made as simple as possible, and without a lubricator, being merely bored up from the head end for lightness. (2) The next point refers to the lubrication of this shackle and spring end. Since the spring has a solid forged eye a boss should be left on it for a lubricator in the end, and it should have a floating bush grooved and drilled opposite the lubricator. The object of this is to allow of the fitting of a valance to the chassis which conceals the rear spring and fits closely round it. All the lubricators can then be reached from underneath the footboard. (3) The thickness of the flange of the pivot for the front end of the rear spring should be reduced to the same dimension as the flange thickness for the cross member fitting at this point. The stamped recess in the back of the pivot should be carried in a little deeper as in sketch, and the nut should be made with its horizontal portion as a separate feature to the castelllations, these latter being reduced in diameter as in sketch. It is found in practice that the castelllations when cut through the hexagon itself so weaken this latter that it is not fit for tightening the nut. The bush in the upper bearing of the shackle should be of the floating type. The six-bolted flange for the pivot is approved. (Contd.) | ||