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(7)  [[1]]

of the crankshaft, which rotates the three sets of planet gears round the sunwheel.  The latter is the fixed member of the gear and is prevented from rotating by means of a friction anchorage in the form of a multi-plate clutch, the plates being anchored to the casing and the sunwheel alternately, and pressed together by springs.  This arrangement limits the maximum torque which may be imposed on the gears, the clutch being designed to slip if a certain torque is exceeded, due, for instance, to periodic stresses set up by propeller vibrations or pre-ignitions.
    The gears and other wearing parts are machined from 5% case-hardening nickel steel.  The planet gear run on ball or roller bearings and are mounted in nickel steel planet cages which are bolted to the flange of the propeller shaft.  The propeller shaft is made of nickel-chrome steel and supported at its inner end in a bearing mounted in the crankshaft and the front end is carried in a roller bearing of ample proportions.
    A double thrust ball bearing is contained in the front end of the epicyclic gear casing to take thrust from the propeller.
    The use of an epicyclic reduction gear as arranged on the Rolls-Royce aero engines prevents any reaction from the driving

755  [[2]]

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Transcription Notes:
[[1]] centered [[2]] centered