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).
Two-fold cause for failure in ball bearings used for clutch thrust on the Phantom III.
| Identifier | ExFiles\Box 93\3\ scan0408 | |
| Date | 29th December 1937 | |
| Handwritten: Chandler Should like to have your Comments By fil use 312 Typed: c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} PHANTOM III. G.83343. RE: BALL BEARING USED FOR TAKING CLUTCH THRUST WHEN DISENGAGING THE CLUTCH. From an examination of three of the above races, which have been returned for my attention, two of them being taken from 3-AX-41 after a mileage of 9695, the other from 3-CP-16, mileage 6500, it is evident that the cause of the trouble is two fold :- (a). The oil which is being supplied is certainly not reaching the bearings. This aspect of the matter is being dealt with by the Design Department, and we hope to be able to issue a scheme quickly that will enable the Service Departments to correct chassis as they become available. (b). It would appear that an increased working clearance between the balls and the race is desirable. We are taking this matter up with the Hoffmann Co. as we have already specified the 000 fit which represents the widest running clearance they normally use. It is essential that a bearing used to take up thrust should have ample running clearance for the purpose of allowing the thrust angle between the races to be inclined as much as possible as the greater the inclination of the thrust axis the less the loading and wear on the balls and the races. By BY.{R.W. Bailey - Chief Engineer} | ||