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 changes and departures from an original sketch for an automatic damper control system on a P.2. S.M. gearbox.
| Identifier | ExFiles\Box 15\5\ Scan276 | |
| Date | 5th May 1932 | |
| x7310 E.{Mr Elliott - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} C. to SG.{Arthur F. Sidgreaves - MD} BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair} DAL/M5.5.32. X.7520 X.7310 SHOCK DAMPERS - AUTOMATIC DAMPER CONTROL - P.2. S.M. GEARBOX. Herewith we send N. sch. 3468, shewing the arrangement of automatic control of the dampers in accordance with the speed of the car, as recently instructed by R.{Sir Henry Royce} In view of the nearness of R's return and also of the fact that we have had fairly precise instructions from him, we are sending this drawing simultaneously to him and Derby, telling R.{Sir Henry Royce} that this is so. We have departed from R's sketch in the follwoing particulars :- (1) We have suggested the elimination of the reduction gear to the pump. This is because R.{Sir Henry Royce} has been under the impression that the servo travelled at a quarter engine speed, whereas actually it is one ninth engine speed. Under these circumstances an additional reduction seems unnecessary. The removal considerably simplifies the mechanism. (2) We have changed the angle at which the governor balls lie from approx: 30 to 45⁰. The reason for this is that at 45⁰ it is much less important where the governor is set as the pressure on the ball valve is practically unaltered by considerable variations in the position of the governor balls. This is not the case at the 30⁰ angle which would therefore require more careful setting. (3) On R's sketch the slot for dismounting the eccentric strap is shewn at right angles to the load. We have shown it on top in line with the load. This is to enable us to assemble the eccentric in the box. We think that R's intention was to assemble the eccentric and strap while off the spindle, which permits of the slot being at right angles, but does not lend itself to assembly inside the box. It is suggested that the load is so slight that the cutting away at the top of the eccentric strap will be unimportant. The maximum speed is approximately 300 r.p.m. (4) The pin conveying the pressure from the governor balls to the rod operating the ball valve has been passed | ||