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 for a helical second-speed gear for the 'Prechine' model.
| Identifier | ExFiles\Box 179b\1\ img248 | |
| Date | 24th December 1932 | |
| BY.{R.W. Bailey - Chief Engineer} FROM HDY.{William Hardy} ORIGINAL. HDY{William Hardy}1/M24.12.32 C. to SG.{Arthur F. Sidgreaves - MD} WDH. LS. E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} R&G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Y4027. HELICAL SECOND SPEED. PRECHINE. H.{Arthur M. Hanbury - Head Complaints} scn. 3629. which we send herewith shows a design for a helical 2nd. speed with ground 1st. speed pinion, hardened sleeve for bearing surface, and a bearing length almost as great as for the 3rd. speed pinion. We rely upon the larger radius of the engaging teeth causing movement to take place at these teeth, and not on the splines. This principle is not so effective for rocking movements as movements parallel to the shaft, however. The centre bearings are the existing special bearings, but reduced in width 2 mm. which we suggest may make no reduction to load capacity. It is essential that the sleeve be tight enough to prevent rotation as it is not to be pinned, and the shoulder provided would not be sufficient were the sleeve to rotate. We have reduced the thickness of the actuating fork to .250". The width must be increased to compensate. See early 20HP. forks such as G.51527. The reverse shaft is slightly longer. We shall be sending similar designs for Sensport, Phantom, and 20/25. HDY.{William Hardy} | ||