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).
Solutions for chunking and slack in the Ph.III rear axle differential.
| Identifier | ExFiles\Box 92\5\ scan0047 | |
| Date | 28th February 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Hdy.{William Hardy} c. to By.{R.W. Bailey - Chief Engineer} x302 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}18/KW.28.2.36. Rear Axle Differential. In order to reduce chunking on Ph.III cars we have to keep the total rear axle slack as low as possible. A new axle quickly develops slack owing to wear of the differential pinion bronze thrust washers. If we compare these washers with either the Packard or Buick, we find they have much larger washers on a lighter duty axle. Judging by Buick results this overcomes the trouble. We have thought of trying parallel roller thrust bearings to the attached layout put up by Ransome & Marles, but realise this would be a very expensive cure. We think a considerable increase in area of washers, together with improved oil circulation as on the Buick, should be tried as soon as possible. Will Hdy.{William Hardy} please send us a scheme, which we ought to test and get on production as soon as possible. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||