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).
Design of Maybach gearbox dogs, specifically face angles, tooth rounding, and engagement.
| Identifier | ExFiles\Box 22\5\ Scan038 | |
| Date | 2nd March 1931 | |
| TO R.{Sir Henry Royce} FROM DA{Bernard Day - Chassis Design}/HDY.{William Hardy} X3v31 DA{Bernard Day - Chassis Design}/HDY{William Hardy}1/M2.3.31. Copy to - HS.{Lord Ernest Hives - Chair} MAYBACH DOGS. X.2200. X.3531. We send a copy of our DA{Bernard Day - Chassis Design}/HDY{William Hardy}20.2.31. which is referred to in HS{Lord Ernest Hives - Chair}/LID{A. J. Lidsey}26.2.31. Our letter was written hurriedly as the result of a request by HS.{Lord Ernest Hives - Chair} to us to give any points which might be taken up by RM.{William Robotham - Chief Engineer} in Germany. We understand that the dogs on 14-EX, were on the lines of those on the Chrysler box and would in that case have an angle of about 10°. It seems that a small face angle is a necessity to avoid objectionable clicking. A small face angle is more practical with a toggling control than with a scheme having a neutral as no severe shocks can be obtained with the former, and a very small amount of initial engagement will probably suffice. It will be seen that we are suggesting tooth rounding to prevent accidental crashing engagements. We see that tooth rounding may be detrimental to the ordinary action of the dogs, at least in the case of 3rd. on Japan 3., but we think it is worth a trial, and so have instructed modifications to be tried on 14-EX. DA{Bernard Day - Chassis Design}/HDY.{William Hardy} | ||