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).
Assembly method and schematic discrepancies for the J. 4. gearbox.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan313 | |
| Date | 13th July 1931 | |
| BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} C. to HS.{Lord Ernest Hives - Chair} RHC.{R. H. Coverley - Production Engineer} ORIGINAL J.{Mr Johnson W.M.} 4. GEARBOX. DA{Bernard Day - Chassis Design}1/M13.7.31. X5310. With reference to N. sch. 3283. we think we ought to draw your attention to the method of assembling part of the box so that if you have any comments to make they may be made early in the progress of the work. It will be seen that the 2nd. motion shaft has to be driven out of the bearings and the wheels before the front diaphragm can be pulled off the gearbox. The bearing cover is removed and the nut lock washer undone, and then the countershaft is driven out, the 3rd. speed wheel coming up against the centre web of the box as a stop. The front diaphragm can now be removed, the 2nd. motion shaft constant mesh wheel being loose in the box. It will be seen that it is the large cone which causes this method of dissembly. In assembling the 2nd. motion constant mesh wheel is inserted between the 1st. motion shaft and the cone before being slid on to its shaft. The bearing apparently can go on the last thing. You may think it necessary to machine the portion of the centre web against which the 3rd. speed wheel stops. We think this will be necessary in any case/on account of the rather fine clearance. You no doubt would/also see that the front end of the 2nd. motion shaft is suitable for driving out. While we are writing we should like to draw your attention to 2 slight discrepancies on N. sch. 3283. It will be observed that the top gear sliding rod in the cross section in the bottom L.H. corner has been shewn on the wrong centre-line, but as it is correct in the other views no doubt it is detailed in its proper position. The other point is that in the end view of the striking rod plunger bracket two fitting bolts are called for, and one arrow points to a hole which must obviously be a stud. No doubt you have made the fitting bolts into the top L.H. one and the bottom R.H. one. We should be glad if you would arrange for these bolts to be stopped from turning and held in place. DA.{Bernard Day - Chassis Design} | ||