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).
Problem of oil getting on the brakes from the Phantom front hubs and proposed solutions.
| Identifier | WestWitteringFiles\Q\April1927-June1927\ 16 | |
| Date | 7th April 1927 | |
| TO BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} ORIGINAL DA{Bernard Day - Chassis Design}1/M7.4.27. C. to BJ. HS.{Lord Ernest Hives - Chair} PHANTOM FRONT HUBS. X5420 With reference to BY11/H17327., and the question of oil getting on the brakes from the front hubs, in view of the fact that a guard is fitted to the brake drum it is not easy to say precisely why this happens. The exact relationship of the nuts holding the brake drum to the hub, and the guard, is not quite certain, but it seems possible that they may be level with the edge of the guard, and oil might be flung clear of the guard on to the brake gear. Another suggestion is that oil may trickle down the stationary parts of the pivot, and there is always of course the possibility that the guard itself will get full, and the oil will not escape sufficiently quickly from the drain holes. We have therefore shewn on N. sch. 2392. a suggestion for a second guard, and a further row of drain holes in the hub, so that the oil has an additional chance to escape. We cannot get a very high guard, but we suggest that as shewn it would do some good. If it were a practical machining operation it could be turned solid with the hub, being brought nearer to the hub flange. The possibility of oil draining down the stationary parts we suggest might be reduced by forming a dripping point on the pivot cover. We agree to your proposal to eliminate the felt and substitute grooves. You may think that a spiral groove retaining oil in the hub would be worth trying, though we see that it would also tend to draw in water. It is suggested however that the brake gear forms a very good protection against dust and water, and that the chance of any getting into the hub is small. DA.{Bernard Day - Chassis Design} | ||