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).
Design improvements and proposals for a Bentley Pinion Thrust Bearing.
| Identifier | ExFiles\Box 114\2\ scan0003 | |
| Date | 11th January 1934 | |
| GRY{Shadwell Grylls} To E.{Mr Elliott - Chief Engineer} from Da.{Bernard Day - Chassis Design} c.c. by.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Sce Da.{Bernard Day - Chassis Design}1/HP.11.1.34. Bentley Pinion Thrust Bearing. The position of this now is, that Hoffmann's have commented on our proposal to use cageless roller and ball bearings (N.Sch.3939) and say that while they think the roller bearing would be all right in this form, they do not recommend the ball bearing without cage. They have accordingly put forward a special combined roller and ball bearing going into the available space without alteration to any important piece, in which there are 11 .5 balls taking thrust alone, and 20 - .312 rollers taking journal load alone. We have shewn this on N. Sch.3943. Hoffmann's consider that the bearing even in this form is loaded up to its full capacity and should be thoroughly tested before adoption. Mr Hickling, Technical manager of Ransome and Marles whom Grylls and I saw yesterday considers that immediate relief could be obtained with the present bearing by removing the journal load on the forward race by either recessing the housing or reducing the outside diameter of the forward race. This evens up the load on the two races, using the bearing more efficiently, and though they say they consider the bearing is still overloaded, it is much less so than now. They can improve the thrust capacity approximately 30% by modifying the angle of action of the forward bearing races. They are sending us 6 of these bearings (with outside diameter of forward race reduced) tonight for putting into existing cars, and in the meanwhile are themselves devising tests with a view to demonstrating quickly the superiority of the bearing mounted in this way over the present mounting. If this proposal is successful no alteration at all would be needed to existing pieces. Other remarks made by Mr Hickling on seeing the damaged bearing were: | ||