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).
Suggested modification for the lubrication of Bentley pivots to resolve an issue of seizing.
| Identifier | ExFiles\Box 84\3\ scan0251 | |
| Date | 2nd January 1935 | |
| To Ba. from RHC.{R. H. Coverley - Production Engineer} Bowering To Dy.{F R Danby} c. Hs.{Lord Ernest Hives - Chair} +201 FW LUBRICATION OF BENTLEY PIVOTS. The Front Axle with 4° pivot inclination fitted on S. B. IV., the 10,000 miles trials car, incorporates the method of lubrication shown on GL.{G. Linnett} 675. This scheme differs from standard in that the two holes in the pivot which normally feed the bottom bearing are deleted, and the cavity in the bottom of the pivot is filled by an aluminium plug, the object of these modifications being to prevent loss of oil from the bottom pivot bearing. It is now found, however, that without the holes the bearing surfaces do not get sufficient oil, and the pivots on S. B. IV. have shown a tendency to seize in the bottom bushes. Therefore, as the standard scheme over-lubricates the bearing, the modification shown below is suggested as an alternative, the upper hole in the pivot being deleted and the other drilled lower down so as to break into an undercut at the root of the bottom pivot flange. The plug in the bottom of the pivot could either be omitted altogether or, alternatively, reduced at the lower end so as to form an annular recess for the oil as shown. [Diagram] 1 OIL HOLE BREAKING INTO UNDERCUT IN PIVOT RHC.{R. H. Coverley - Production Engineer} | ||