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).
Load on the spigot bearing in a 25HP Synchro Mesh Gearbox.
| Identifier | ExFiles\Box 179\1\ img104 | |
| Date | 18th November 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} RHC{R. H. Coverley - Production Engineer} ORIGINAL DA{Bernard Day - Chassis Design}2/W18.11.31. C. to DY.{F R Danby} RHC.{R. H. Coverley - Production Engineer} 25HP. SYNCHRO MESH GEARBOX. x5310 We have seen notes on a telephone conversation re. the above box, and wish to comment on ES' remark that the spigot bearing looks inadequate. Assuming that the 3rd. motion shaft between the rear end bearings has no stiffness the load on the spigot bearing due to the 3rd. speed at full throttle is 250 lbs. This bearing is rated as a roller bearing at 540 lbs. It is therefore very adequate for its load and compares favourably with almost any other bearing in the gearbox. In fact, the 3rd. motion shaft between the two rear end bearings is very stiff so that the actual load it does receive is certainly considerably less than the above. It is possible that there might be considerable loads due to the inaccuracy of alignment of the gearbox shafts. We should like to know whether there is any indication of this. We are not sure from the note whether the criticism arose due to the bearing shewing signs of wear or whether it was a result of inspection and a general impression. We should like to point out that most other cars do not have a 3rd. bearing in the centre of the box, which will much increase the load on the spigot bearing. DA.{Bernard Day - Chassis Design} | ||