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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).
Defects and potential improvements for a 4-speed gearbox.

Identifier  ExFiles\Box 6\4\  04-page044
Date  2nd February 1925
  
x.5310
S E C R E T
R2/M2.2.25.
To AJS. from R.{Sir Henry Royce}
c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design}
c. to RG.{Mr Rowledge} HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer}
U. S. A.{Mr Adams}
4-SPEED BOX. X.5310
The defects on this were surprising. I am expecting to hear a word of how it was made better - i.e. the gears to stay in position.
(1) I thought it must be the epicyclic creeping which we know is so troublesome and powerful.
(2) I thought also that the gears were not really hard i.e. decarbonised surface.
(3) I could not see how torsion of shaft should make each of the 3 gears work out, but possibly bending of the shafts between the bearings may.
(4) The loads are very high owing to the great reduction but this or (2) should not make gears work out.
So that (1) or (3) seems most likely.
14° teeth and bigger pinion would be good anyway because gear reduction in box is unnecessarily great with such a low geared back axle, which also might be damaged with a very low first if run long at maximum torque.
Let me have a word as soon as possible of what was done to effect the improvement reported, if not already done.
R.{Sir Henry Royce}
  
  


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