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).
Hydraulic control for an epicyclic change gear with friction brakes to improve passenger comfort.
| Identifier | ExFiles\Box 15\5\ Scan265 | |
| Date | 26th February 1932 | |
| HS.{Lord Ernest Hives - Chair} ) FROM R.{Sir Henry Royce} DA{Bernard Day - Chassis Design}/HDY.{William Hardy} (At Le CanadelHenry Royce's French residence.) x7 310 R2/M24.2.32. Sent from WW. 26.2.32. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} C. to EV.{Ivan Evernden - coachwork} E.{Mr Elliott - Chief Engineer} C. to Mr. CLAREMONT. CHANGE GEAR. K.7310 EPICYCLIC WITH FRICTION BRAKES. K.7360 I think the best control for the passengers would be our hydraulic, arranged in the following way: (1) The brakes to be about 3 times more powerful driving than over-running, by self-servoing action. (2) The brakes can be released as quickly as one likes, but to be applied slowly by withdrawing the oil through a small orifice, the excess given by the pump passing a high pressure release valve. (3) We should only ask the driver to close the throttle when changing to a higher gear, and keep it open when changing down. (This can be tried on out double top or synchro mesh.) (4) It is so much easier (with these schemes) to change at high speeds without accelerating the engine, but I think it will be found that jerking the passengers is caused while changing down at high speeds. (5) I have schemed several special ports and passages in the control cylinders so as to make their action more certain, interlocked, and in sequence, which would be valuable if we adopt this scheme. We have now covered much ground on this subject and seem to know more about it at the moment (perhaps not much) than any other subject; we ought therefore to try to profit by it. I hope to keep Mr.Hardy on the change gear problem for the present, and that when I return to WW. he will consent to work in my house. R.{Sir Henry Royce} | ||