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FINISH WITH EDGES MUST BE
START UNDERCUT
WITH
I
I
FREE
OF
MICA
3-CORNERED FILE
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COMMUTAT
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I
SEGMENTS
I
UNDERCUT T
MlCA
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ABOUT 1/32
"
I
-
FIGURE
7
-
5
--
UNDERCUTTING MICA ON COMMUTATOR
STARTING MOTORS
&
DRIVES
Starting motors on these engines use either Bendix or Solenoid Shift type drives to engage and
disengage. Two different types of Bendix drives are used. One type
(K482) locks in positive engage
-
ment and features an overrunning clutch device to protect the motor from overspeed. On this type, the
centrifugal action of the overrunning clutch deactivates the locking pin and allows the Bendix drive
pinion to retract in conventional manner.
Operating principles of the motors and drives are discussed
further in the following.
Operation: Current from the battery
is
directed through field windings (coils) and also thru the arma
-
ture windings. This sets up a magnetic field around both windings which "buck" each other causing the
armature to rotate. With the solenoid shift type drive, the drive pinion is shifted into engagement with
the ring first then main contacts within the solenoid close to start the armature turning.
With Bendix
drive, the drive pinion moves laterally on a
splined sleeve into engagement as the armature starts to
rotate. When the pinion butts against a stop located at end of the armature shaft
(K662 Bendix starters),
it locks in positive engagement with the shaft to crank the engine.
On K482 Bendix type starters, a
spring loaded pin drops into a slot in the armature shaft to lock the pinion to shaft for cranking. The
shaft and pinion remain in positive engagement until the engine
"
fires
"
and attains sufficient speed for
the flywheel to begin overriding that of the armature.
The
K482 Bendix type and K662 solenoid shifted
starters include overrunning clutches which permit the pinion to be momentarily spun faster than arma
-
ture to protect the motor from 6verspeed. On the K482, the spinning or centrifugal action forces the
locking pin out of the shaft and allows the pinion to retract.
On
K662 type starters, the overrunning
action throws the pinion out of engagement.
A
small anti
-
drift spring holds the pinion in retracted
position until the armature coasts to a stop after the starting circuit is opened.
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1
ARMATURE
n
DRIVE
BENDIX TYPE
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SOLENOID SHIFTED
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FIGURE
7
-
6
--
TYPICAL STARTING DRIVE TYPES
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