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).
Technical memo discussing valve, damper, and lubrication system designs.
| Identifier | ExFiles\Box 28\1\ Scan187 | |
| Date | 6th January 1931 guessed | |
| (2) air vent is necessary but we shall still require the replacement valves. (C) We shew a method of keeping all the slack out of the piston and its cam without taking up headroom: here the spring loading has to be sufficient for a vacuum under the piston and the inertia of the piston, but this can best be found by testing in a silent room. (D) Another patentable point is the method of lubricating the rocker or cam or lever shaft. In this I schemed that the lower of the oil pressures generated in the damper could be carried by drillings to the bearing that has a blind end. The small leak here would not affect the damping but would allow enough oil to pass around and along the bearing into the blind end, and thence fill up the hollow shaft and so lubricate the main bearing (which has the gland) amply, but not under pressure. Although this double type may appear slightly more complicated it has many other advantages, such as only needing one cover and going together very easily, there being no reversal of load, and the main bearing load being always vertical there is no tendency for the cap to be scrubbed about. In the design sent to Derby one or two things might be different. (1) I should draw it all square with all levers horizontal and connect it on the car with a link that located the lever upwards at the axle end - i.e. again all would be square. When the car was under loaded 1" this would allow for the greater movement on the rebound both for clearance outside inside and the toggling of the outside lever and its link. (2) In the double acting valve the high pressure side should be under the valve so that the piston annular area is greater than the valve, about 4/3 instead of 3/4. The leak past this small piston will be less and of less importance. (3) I hope we shall not need the central oiling scheme connected to the damper. I imagined we were oiling the ball connections from the axle oil because no additional flexible pipe would be needed. R.{Sir Henry Royce} | ||