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).
Technical memorandum discussing issues with a Marles Steering roller follower and proposing a design change to prevent uneven loading.
| Identifier | ExFiles\Box 130\2\ scan0010 | |
| Date | 1st July 1936 | |
| COPY. Marles Steering - 22-G-V.{VIENNA} When re-assembling the roller follower it was found that the faces of the carrier were not parallel, but that it was possible to bring them together by tightening the nut on the splined bolt carrying the two inner races. In the event of these faces not being parallel when the roller was assembled, the load would be unevenly distributed on to the balls, and was probably the cause of the ball failing and the pitting on the races on 22-G-V.{VIENNA} With the present design to overcome this difficulty, it is essential that the total length of the two inner races, their packing washers and the distance piece between them equals the distance between the jaws of the carrier, when the two faces are truly parallel. If, however, the distance piece 'A' was solid it would have to be of such a length that the balls between the two races would have no play, and yet be free and even in rotation. This would be troublesome and need careful fitting and the use of additional packing washers between the distance piece 'A' and the inner races might tend towards increased springiness. To obviate this difficulty we suggest that the diameter of the splined bolt be increased, if possible, leaving a shoulder against which the nut could be tightened up without nipping together the faces of the carrier to any appreciable extent. The adjustment of the ball races could then be carried out with packing washers as at present but would be more independent of the tension in the splined bolt and the loading on the balls more equal. Hs{Lord Ernest Hives - Chair}/J.B.Dixon. | ||