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).
Modified bevel pinion driving taper for the J.3. rear axle on a 20/25 HP car.
| Identifier | ExFiles\Box 102\4\ scan0098 | |
| Date | 12th December 1935 | |
| x502 Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions}1/HP.12.12.35. BY.{R.W. Bailey - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} c. RHC.{R. H. Coverley - Production Engineer} N.Sch.4705 - Modified Bevel Pinion Driving Taper - J.3. Rear Axle for 20/25 HP. In response to a request from Experimental Department N.Sch.4705 has been prepared showing the slower (1 in 8) driving taper on the bevel pinion of the J.3. rear axle for the 20/25 HP. car, required for the next 10,000 miles test. This modification is only necessary when this axle is used with the large bore 20/25 HP. unit, since the original J.3. pinion driving taper can transmit a torque which bears the same relation to the maximum low gear torque of the production 20/25 HP. unit, as the Bentley pinion torque bears to the low gear torque on production cars. The modified taper can transmit approximately 3-1/3 times the torque of the original taper. The provision for oil retaining at this point has also been brought into line with the latest Phantom 3 practice. Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions} N.Sch.4705 herewith. | ||