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).
Specifications and application of 1' and 2' off-set hypoid gears.
| Identifier | ExFiles\Box 136\5\ scan0144 | |
| Date | 14th April 1927 | |
| To BY.{R.W. Bailey - Chief Engineer} from DA.{Bernard Day - Chassis Design} c. to BJ. Hs.{Lord Ernest Hives - Chair} X2066 DA{Bernard Day - Chassis Design}3/M14.4.27. EAC.10 - HYPOID GEARS. X.2066 X.8310 X.7310 With reference to R4/M7.4.27., we did not understand that R.{Sir Henry Royce} intended to scrap the 2" set off-set hypoids. We believed that those with the 1" off-set were intended as a reserve in case trouble was experienced with the first ones. For one thing we cannot do with less than 2" to take full advantage of these gears in lowering the frame as proposed on EAC.9. The 1" off-set only permits us to correct the faults that exist on EAC.7. at the present minute, and we shall not be able to get the frame any lower. We are not quite certain what R.{Sir Henry Royce} intends and shall discuss the matter further with him, but in the meanwhile we have prepared N.sch.2399 herewith, shewing a pair of hypoid gears that a 1" off-set. It will be seen that only two new pieces are required apart from the actual gears namely, a new centre s casing, and a new bridge piece, so that the bulk of the deal details already prepared for the 2" off-set gears are still available. We believe that Gleason's have asked for rather wider teeth, and since we can do it without trouble here, we have shewn them 1.8" wide instead of 1 1/2" We have rather gone beyond the spiral angle limits which Gleason's indicated when the gears were first announced, and they may not approve of the spiral angles. we do not intend to tie them down. We have only shewn one ratio - 11/41 - and will send you others if necessary after we have discussed the matter with R.{Sir Henry Royce} DA.{Bernard Day - Chassis Design} | ||