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).
Diagram and calculations for a 250 HP Sun Wheel and Planet Pinion gear mesh.

Identifier  ExFiles\Box 28\5\  Scan107
Date  10th March 1916 guessed
  
250 H.P. Sun Wheel & Planet Pinion.
Scale 5/1
X 2044
45 teeth
12 D.P.
3.750 dia.
P' = π/12 = .2618
P' cos 14 1/2°
1.875 + .083 = 1.958"
Root Circle
Base Circle
Pitch circle
Addendum Circle
14 1/2°
Line of Action
MP = .313
BP = .253
AP = .265
PD = .247
AD = .512"
Twice normal pitch = .507" = path of contact
Two teeth always in contact
No interference
1.210
1.250
1.333
30 teeth
12 D.P.
2.500 dia
Diagram labels: M, A, B, P, D, C, H
  
  


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