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).
Reverse pinions and jaw clutches in gearboxes, including a design suggestion with a diagram.
| Identifier | ExFiles\Box 15\5\ Scan297 | |
| Date | 20th May 1932 | |
| E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} )FROM. R.{Sir Henry Royce} HS{Lord Ernest Hives - Chair} ) (AT LE CANADELHenry Royce's French residence.) X7310 R6/M11.5.32. Rec'd and despatched from WW. 20.5.32. X. 7310 X. 5310 X. 4553 C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} BENSPORT & OTHER GEARBOXES. Reverse pinions I agree can be of the long shaft pattern if this can pass the test satisfactorily. Our car here is of that type, and naturally we could not feel the reverse when getting into 1st. It has done all we have asked of it faultlessly, but we have never gone far backwards. Any running gears that work out to the edge are dangerous for destruction of the teeth. Regarding the S. M.{Mr Moon / Mr Moore} working out the jaw clutches, E.{Mr Elliott - Chief Engineer} treated these much as our double pinion 1st. and 2nd. in the patent, but reversed. I am not sure that this will be successful in all cases, because the sleeve will have motion at each end, and may creep in any direction. Here is another suggestion which ought to get over the trouble if found still to happen, but I am very doubtful if it can be applied thus: The small dia. serrations are ordinarily long, and double, and wide apart, much as originally made. As the twist and control of these is great there should be no movement while under load, driving or over-run. Outside this hub at a larger dia. is another short set of teeth which can only slide .050 on the inner hub. At each end of the thin parallel tube (sleeve) are the present driving teeth. It is obvious how and why it should stay where put, but very doubtful if it can be got into the design. [Diagram] Inserted teeth or split here Hardened largest dia possible. Tests should be made with the shafts out of line and wheel slack, so as to get some definite motion. R.{Sir Henry Royce} | ||