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).
Detailed explanation of the interaction between the clutch and the servo braking mechanism.
| Identifier | ExFiles\Box 73\1\ scan0118 | |
| Date | 27th February 1924 | |
| BY1-P27.2.24. contd. - 3 - It should be noted that this movement carries the clutch away from the collar it would be held against normally when the servo shaft is rotating towards the collar limiting its travel in the opposite direction. It now the car be assumed to move forward (down hill) then immediately the driving member of the clutch moves back axially along its shaft whilst it rotates and presently picks up the loose cone and forces the whole unit back against the action of the spiral keys in the brake lever first mentioned. By allowing this movement to continue for say .250" axially, still pressing against foot before the driving member of the clutch comes against the collar on the shaft (which prevents further angular or axial movement between the shaft and this clutch member) the energy of the car acting through the spiral keys in the brake lever rotates the latter, pushes up the drivers foot the amount corresponding with the .250 axial movement and releases as it does so the pull on the cable between the operating lever and the equalising shaft, and at the same time tightens up a second cable connection to same equaliser fixed to lever on the driven member of the clutch. From the foregoing it should be clear that when the car is stationary or running backwards the foot pedal energy goes direct to the brakes, but directly the car moves forward the servo mechanism asserts its predominance, releases the pull on foot brake cable and at the same time and rate contd | ||