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).
Inter-office correspondence regarding the lateral adjustment of a pinion on Gleason gears.
| Identifier | ExFiles\Box 49\2\ Scan065 | |
| Date | 16th March 1922 | |
| X3G12 INTER-OFFICE CORRESPONDENCE ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. [RR Logo] Cyl - G 16322. March 16, 1922 Dear Hives:- Re: Lateral Adjustment of Pinion on Gleason Gears. X4180 X3G12 We notice in the "Automobile Engineer" of October 1921, page 360, a patent taken out by Gr{George Ratcliffe}égoire for lateral adjustment of the bevel pinion by means of four set screws. We have used a similar adjustment for the pinion bearing housing of the reverse thrust device A-927 (of which I have already sent you a print) by grinding the spigot of the pinion bearing housing where it fits in the rear axle box, .020 eccentric with the other diameters of the housing, so that by changing the angular position of the housing relatively to the axle box it is possible to raise or lower the bevel pinion up to .020" above or below the centre line of the axle box. The resulting changes in the backlash of the bevel gear are taken care of by the regular bevel gear adjustment. By this means it is possible to alter the bedding of the teeth so that it occurs evenly along the face of the gear. And we find that by getting this bedding correct in the first place we can guarantee silent operation on any gears except those which are obviously roughly finished. This was originally developed as a result of a test on our bevel gear testing rig, where it was proved that by adjusting the height of the pinion centre relative to the gear centre, it was possible to make a pinion, which at first bore heavily on the small end in driving and the large end on overrun, bear evenly along the face of the tooth thus: | ||