Starting Motors & Drives - Kohler K482 Service Manual

START UNDERCUT WITH
3-CORNERED FILE
COMMUTAT
SEGMENTS
STARTING MOTORS & DRIVES
S t a r t i n g m o t o r s on t h e s e e n g i n e s u s e e i t h e r Bendix o r Solenoid Shift type d r i v e s t o engage and
d i s e n g a g e . Two d i f f e r e n t types of Bendix d r i v e s a r e u s e d .
m e n t and f e a t u r e s a n o v e r r u n n i n g c l u t c h d e v i c e t o p r o t e c t the m o t o r f r o m o v e r s p e e d .
c e n t r i f u g a l a c t i o n of the o v e r r u n n i n g c l u t c h d e a c t i v a t e s the locking p i n and a l l o w s the Bendix d r i v e
pinion to r e t r a c t i n conventional m a n n e r .
f u r t h e r in the following.
Operation: C u r r e n t f r o m the b a t t e r y is d i r e c t e d through f i e l d windings ( c o i l s ) and a l s o t h r u the a r m a -
t u r e windings. T h i s s e t s up a m a g n e t i c f i e l d a r o u n d both windings which "buck" e a c h o t h e r c a u s i n g the
a r m a t u r e to r o t a t e .
the r i n g f i r s t then m a i n c o n t a c t s within the solenoid c l o s e t o s t a r t the a r m a t u r e turning.
d r i v e , the d r i v e pinion m o v e s l a t e r a l l y on a s p l i n e d s l e e v e i n t o e n g a g e m e n t a s the a r m a t u r e s t a r t s t o
r o t a t e . When the p i n i o n b u t t s a g a i n s t a s t o p l o c a t e d a t end of the a r m a t u r e s h a f t (K662 Bendix s t a r t e r s ) ,
i t l o c k s in p o s i t i v e e n g a g e m e n t with the s h a f t to c r a n k the engine.
s p r i n g loaded pin d r o p s i n t o a s l o t in the a r m a t u r e s h a f t t o l o c k the pinion t o s h a f t f o r c r a n k i n g .
s h a f t and pinion r e m a i n in p o s i t i v e e n g a g e m e n t until the engine " f i r e s " and a t t a i n s s u f f i c i e n t s p e e d f o r
the flywheel t o b e g i n o v e r r i d i n g t h a t of the a r m a t u r e .
s t a r t e r s include o v e r r u n n i n g c l u t c h e s which p e r m i t the pinion t o b e m o m e n t a r i l y s p u n f a s t e r than a r m a -
t u r e to p r o t e c t the m o t o r f r o m 6 v e r s p e e d .
locking pin out of t h e s h a f t and a l l o w s the pinion t o r e t r a c t .
a c t i o n t h r o w s the pinion out of e n g a g e m e n t .
p o s i t i o n until the a r m a t u r e c o a s t s t o a s t o p a f t e r the s t a r t i n g c i r c u i t i s opened.
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ARMATURE
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FIGURE 7- 5 UNDERCUTTING MICA ON COMMUTATOR
O p e r a t i n g p r i n c i p l e s of the m o t o r s and d r i v e s a r e d i s c u s s e d
With the solenoid s h i f t type d r i v e , the d r i v e pinion i s s h i f t e d i n t o e n g a g e m e n t with
DRIVE
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FIGURE 7-6
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FINISH WITH
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One t y p e (K482) l o c k s i n positive engage-
The K482 Bendix type a n d K662 solenoid shifted
On the K482, the spinning o r c e n t r i f u g a l a c t i o n f o r c e s the
On K662 type s t a r t e r s , the o v e r r u n n i n g
A s m a l l a n t i - d r i f t s p r i n g holds the p i n i o n i n r e t r a c t e d
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TYPICAL STARTING DRIVE TYPES
EDGES MUST BE
FREE OF MICA
UNDERCUT T
ABOUT 1/32"
On t h i s type, the
On K482 Bendix t y p e s t a r t e r s , a
SOLENOID SHIFTED
With Bendix
The