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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).
Design of a hypoid rear axle casing for a 20 HP model.

Identifier  ExFiles\Box 136\5\  scan0186
Date  29th May 1929
  
X2066 ?
By.{R.W. Bailey - Chief Engineer} from DA.{Bernard Day - Chassis Design}
SECRET.
DAL/M29.5.29.
c. to Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair}
20 HP. HYPOID REAR AXLE.
X2066
X5350
Herewith we send N. sch. 2886. shewing the
hypoid rear axle casing for the 20 HP. We have followed
the lines of SS.{S. Smith} as closely as possible, as we have shewn
that this axle is as strong, or stronger, in every respect
than SS.{S. Smith}
In order to make the gear teeth comparable we have
disregarded the conventional diametrical pitch, and fixed
on a 10" dia. crown with 41 gear teeth, making the pitch to
correspond. We understand that this is permissible.
We do not wish to tie down the manufacturers of the hypoide
in any way except as to number of teeth, and the approximate
diametrical pitch, but we have ascertained geometrically
that these gears can exist.
The New Departure type thrust bearing is made on the
lines of the SS.{S. Smith}, that is to say, it is not a standard
bearing, but all the dimensions are standard dimensions.
The lubrication of this bearing we suggest should
be made by coring a hole into the recess, which itself is
sealed by the bearing housing. Should insufficient
oil get through this hole we will provide a scoop, but it
appears as though sufficient should get in.
DA.{Bernard Day - Chassis Design}
  
  


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