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).
Application of a Borg and Beck servo spring to the Phantom III clutch.
| Identifier | ExFiles\Box 93\3\ scan0336 | |
| Date | 12th July 1937 | |
| [Strikethrough]BY[/Strikethrough] [Strikethrough]C.E.Des.Rm.{William Robotham - Chief Engineer}H.H.S.[/Strikethrough] 3/2 E/HDY.{William Hardy}/1/HP.12.7.37. Phantom III Clutch. We send herewith N.Sch.5195 showing the Borg and Beck servo spring applied to the Phantom III clutch. Although, when compared with the Experimental Department's scheme, there are constructional differences, it is not intended that there should be any difference in the result obtained. The clutch pedal has the 1" of extra travel recently standardised and the higher leverage is used giving the same pressure plate separation (.092) as on the standard clutch. The fixed anchorage of the spring is made integral with the vertical suspension link as this seems to save cost compared with a bracket from the frame. This arrangement has the effect of transferring the tendency to knock from the fore and aft stay to the upper joint of the vertical link. If this is troublesome a spring can be provided to load this joint always one way. There is also a changeover of load at the pedal bearing on the shaft, but we think that as the area is large and this bearing is lubricated there will not be any knock here. We are informed that there may be up to .1" variation of the engine fore and aft from the designed position relative to the frame. This will vary the fixed anchorage of the servo spring vertically and may upset the action of the spring. We propose to deal with this by means of a dead eye adjustable fore and aft. A scheme will be sent later. E/HDY.{William Hardy} | ||