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).
Failure of 'Condor' reduction gear planet bearings and proposing a switch to ball bearings.
Identifier | ExFiles\Box 38\6\ Scan065 | |
Date | 25th September 1918 | |
H.H. 835A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/15. x 3383 TO DA{Bernard Day - Chassis Design} ) from E.{Mr Elliott - Chief Engineer} TO EH ) c. to EFC. 25th Sept. 1918. E1/G25918. X.1827 X.3383 X.3384. RE "CONDOR" REDUCTION GEAR PLANET BEARINGS It is suggested that the failure of the "Condor" reduction gear roller bearing is due to a species of side slip on the roller. This may be caused by deflection of the double pinion as a beam between the two bearings, which would tend to cause the rollers to try and assume a helical path in the outer race, or side slip due to some other cause, such as inequality of load. It is, however, noticeable that one of the bearings shews that the rollers and races have been loaded at one end very heavily. A ball bearing does not appear to be so sensitive as a roller bearing in respect to the nature of its load. The roller bearings we have used hitherto on the planets of our gears do not seem to be at all happy. Mr. Royce suggests that we try on the reduction gear a ball journal in place of the roller bearings, to see if it will stand up to the load. We think quite possibly this may be the case, since it would appear that the ball type of bearing is more accommodating and less likely to become injured through slight inequalities in the application of the load. If the ball bearing stands up, then it should tell us that the roller bearing is not overloaded, but is in some way badly treated. It seems worth while at the same time to get out Contd. | ||