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Fig. 192.—Views of Overland Four Cylinder Motor Showing the Application of the Current Generator at A and the
Starting Motor and Ignition Magneto at B.
shown at E, the pinion which engages the gear on the flywheel is shown mounted on the armature shaft, and the cover, which normally covers the brush end of the motor, is removed in order to show the method of reaching the motor brushes when these members need attention.
Fig. 193.-Wiring Diagram of Auto-Lite-Chevrolet Starting, Lighting and
The diagram Fig. 190 shows the 1916 Overland Auto-Lite system. This differs from the 1915 system principally in the use of an automatic pinion shift, and the units are changed slightly in detail as outlined at Fig. 191, in consequence. The application of the system to the four-cylinder power plant is shown at Fig. 192, while the method of installing the units on the sixcylinder Overland engine is depicted at Fig. 193.
Gray & Davis System.—The starting and lighting equipment used on the Model 79, 1914 Overland, is the Gray & Davis system, shown at Fig. 195, and comprises three principal units:
Fig. 194.—Views Showing Controlling Devices of 1916 Overland Car.
Note Controlling Switch on Steering Column and Starting Switch Button Next to Accelerator.
a—The generator which produces the current and delivers it to the lamps and storage battery.
b—The storage battery which accumulates the current thus generated and delivers it to the lighting system or the starting motor, as occasion demands.
C—The starting motor, which receives current from the storage battery and revolves the engine whenever it is to be set in motion.
Besides these three principal units the system includes the following auxiliary apparatus:
d-An automatic cutout, whose function is to disconnect the generator from the storage battery when the engine is stopped or running below the speed at which the generator's voltage is high enough to charge the battery. The cutout is located on the engine side of the dash.
e-The starting switch, which is a pedal-button located in the floor board of the car convenient to the foot of the operator.
f—The ammeter, whose purpose is to show whether the system is working properly or not. When the dynamo is running and sending current to the storage battery the ammeter hand will point to the right of zero or at “charge.” When the lights are burning or the starter motor is running, this hand will point to the left of zero or at “discharge,” thus indicating the rate at which current is going out of the storage battery.
The speed of the generator is controlled by an automatic clutch that is so designed that, no matter how fast the engine runs, the generator will not be driven faster than a certain predetermined speed which corresponds to that at which the engine runs when driving the car at 12 miles per hour on high gear, but, of course, if the engine drops below this speed the generator will also. This is done by means of a centrifugal governor which regulates the slippage of the clutch so that the generator cannot be driven faster than the predetermined speed, the greater the speed of the engine the more the clutch slips.
The current load is automatically taken care of by a compound winding on the generator. The starting motor is a series wound machine, that is, the entire armature current passes through the field. The motor is provided with an over-running clutch, which