Rolls-Royce Archives
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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).
Secret memo regarding modifications to the Japan 3 project's hypoid rear axle.

Identifier  WestWitteringFiles\V\October1930-February1931\  Scan309
Date  7th February 1931
  
SECRET.
FROM DA.{Bernard Day - Chassis Design}
C. to RHC.{R. H. Coverley - Production Engineer}
JAPAN 3. HYPOID REAR AXLE.
ORIGINAL
Herewith we send N. sch. 3206. - Rear axle centre casing.
This is somewhat modified from the 25HP. because the larger axle shafts increase the differential and its bearings, and the 4.5 litre engine makes it desirable to increase the pinion thrust bearing to make it comparable with P. 2.
The pinion thrust bearing housing is an adaption (to suit larger dimensions) of that on N. sch. 2990. (Dec. 1929.) which we believe was never used. It appears to avoid the defects which came up in the scheme shown on G.53920. (which was condemned by R.{Sir Henry Royce})
We should like more information on this point, viz: what modifications were made by RHC.{R. H. Coverley - Production Engineer} and were they successful?
DA.{Bernard Day - Chassis Design}
  
  


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