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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).
Starter motor and dynamo applications, including details on a 20 HP Crossley gear and voltage regulation.

Identifier  ExFiles\Box 31\1\  Scan013
Date  6th December 1913
  
Contd. -2- Da{Bernard Day - Chassis Design}3/G6.12.13.

can be obtained on the chain sprockets.

I expect you have full particulars of the
starter but send you a 2/1 drawing of the gear on the
20 H.P. Crossley, which shews the epicyclic details plainly,
thinking you might be interested in it. The free wheel
at A is not keyed to the shaft, but driven through the
friction plates under the pressure of the washer at B.
This allows for inertia when the dynamo is being slowed
up. The main brake is at C and D is a secondary brake,
which slips when the engine overruns very much or a back
fire occurs.

X.1402. The voltage regulation is by a carbon rheostat
in which a solenoid controls the pressure of a spring on
about 12 discs. It gave a very steady voltage when I saw
it, and has the advantage that the current falls as the
charge goes on, the inverse being the case with the more
usual type of field control.

We have schemed out an application of the
starter to one of the experimental cars, and send you a
print F.4299.

The idea is that the driven sprocket replaces
the dynamo pulley on the gear box, the flange and its fixeding
being strengthened up to suit, and the starter occupies the
place of the dynamo. The torque reaction and chain pull is
taken on the chain casing, which is bolted to the starter,
surrounds and bears on the bearing for the striking rods,
Contd.
  
  


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