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).
Proposal for new rear axle pinion bearings for the Bentley 11A and 111 models.
| Identifier | ExFiles\Box 84\4\ scan0339 | |
| Date | 11th November 1937 | |
| F.T. NARDY [crossed out text] BENTLEY Rm.{William Robotham - Chief Engineer} 202 Da.{Bernard Day - Chassis Design}10/G.11.11.37. BENTLEY 11A and 111. REAR AXLE PINION BEARINGS. Herewith are PD.40 and 41 shewing respectively the proposed thrust and nose bearing for the pinion of the above axle. The object is to increase the capacity [handwritten mark over 'capacity'], especially of the thrust bearing, which seems definitely insufficient on the present bearing. As a considerable amount of radial slack, due apparently to the inadequate radial control, is present with the present type of bearing, a type is here proposed, in which the radial load is received by rollers at both ends, and the thrust only is taken by the angular contact ball bearings. This should have the advantage that all the balls are equally loaded, instead of load being concentrated on one side, as must be the case now. Also the radial slack is not dependent on the preload as it is now. The cost is less than the present bearing, according to Hoffmanns quotation, though no doubt a reduction on that could be obtained. We prefer the three row bearing to any of the larger ones of the present type that have so far been proposed. The increased capacity nose bearing is proposed partly to deal with the small increase of load on this bearing produced by using the new thrust bearing and partly because the present bearing seem rather overloaded. We suggest that Hoffmanns should be asked to quote again the thrust bearing as shewn on PD.40 and that a set should be built into an existing axle casing as soon as possible for test. The PD. drawing is sufficiently complete to require no further work by G.CD. Dept. DA.{Bernard Day - Chassis Design} | ||