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).
3rd gear disengagement fault on the 40 HP Ghost chassis gearbox and the successful trial of a modified spline arrangement.
| Identifier | ExFiles\Box 178\4\ img059 | |
| Date | 5th May 1922 | |
| R.{Sir Henry Royce} From RE/GF/. C. to Mr. Wor.{Arthur Wormald - General Works Manager} C. to Mr. D.H. C. to Mr. Hy.{Tom Haldenby - Plant Engineer} XS310. HS{Lord Ernest Hives - Chair}/GP/1/WLC. 5. 5. 22. 40 H.P. GHOST CHASSIS 3RD. GEAR JUMPING OUT OF GEAR. This trouble has occurred on a large proportion of cars on production test. The gear works out on the overrun particularly at high speeds but on odd cars at low speeds too. When we first tested the 40HP A.C. Crompton gearbox the top gear was found to come out on the overrun. The 3rd. and 4th. gear sliding piece then had six driving splines under the 3rd gear teeth. The sliding piece was therefore altered so that the splines were nearer the 3rd gear teeth, and a bearing was provided under the top gear teeth. This practice consisted of splines in the sliding piece running on a plain shaft. The gear then no longer came out but later the trouble developed of 3rd coming out. We have therefore tried the arrangement suggested by E on Let. E.{Mr Elliott - Chief Engineer} 97 in which the splines on the shaft are so positioned that in either gear the drive through the sliding piece is taken from the teeth at one end to the splines at the other. This has proved successful on 3 cars 3rd gear showing no tendency to work out even with the selector springs slack. We recommend that fitting this modification and also fitting it to all cars that develop this trouble but with the present friction shaft. HS{Lord Ernest Hives - Chair}/A.DP/WLC. 1 print 4CC: | ||