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).
Diagrams and calculations for interference in involute teeth for a sun wheel and planet pinion.

Identifier  ExFiles\Box 28\5\  Scan106
Date  28th April 1919 guessed
  
190 H.P. Sun Wheel & Planet Pinion

Interference in involute teeth

.021"
.020"
.007"
.0075"
D .0025"

51 teeth. 102 mm dia. 2 module

Addendum circle
Addendum circle

24 teeth 48mm dia.
2 module

OB = 6.01 mm
OA = 6.49 mm

Pitch point
OE = 5.66 mm
Pitch circle
Base circle

AE = 12.15 mm
BE = 11.67 mm
hence normal pitch = 12.17 mm
11.67
.50
  
  


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