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).
Annotated diagrams and design notes for a mechanical pressure unit.
| Identifier | ExFiles\Box 182\M20\M20.1\ img014 | |
| Date | 4th April 1924 guessed | |
| (2) 4 grooves for ratchet washer. Clear here & short bearing only at extreme other end. Very slow taper so that reamering does not destroy accuracy of holes & pins, all of which must be as true as possible but can easily be checked. It will be noticed that the 3 driving pins also carry the small load due to lifting link which falls on this end but this is advisable so that 3 pins drive equally without binding on the shaft at 'A'. In this arrangement the whole of the pressure unit is outside bearing; one half is on pressure bolt, the other on end of main driving plate - Direct foot pressure. Direct foot pressure to brakes. Hexagon here. Thin nut. About .1 radial depth. This will travel this way with wear. Ratchet washer could form one ball thrust race levers the other. These are .020" high, about. It looks as though face inclined planes 30 to 45° about .2 high which could be casehardened would be better (as used by RG.{Mr Rowledge}) Nut can be long & bored plain at ratchet end. Two rows of balls on one inner race which carries radial load of bearing and thrust of lever. all separate ball thrust washers are cancelled. They are often weak and may crush up if hard steel. Casehardened surfaces are good enough. I have received RG{Mr Rowledge}'s notes to say jaggers re-appeared. You will remember that I suggested these would force us to fairly slow speed servo. Foot to B.A. only (loud.) might possibly help this. I do not favour too little pressure required from foot for 2 or 3 reasons - emergency, smashing something. Habit will prevent us having enough direct pressure for close driving. My centre bolt is as free as it can possibly be. R.{Sir Henry Royce} | ||