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Mitsubishi 4DQ5 Service Manual Page 77

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(2) Reduction gear train and overrunning clutch
The inner end
of
armature shaft carries a drive
gear which
is
in mesh with a driven gear splined
to the pinion shaft to provide speed reduction.
The pinion shaft
is
fitted loosely to the outer
race
of
overrunning clutch through helical spline
engagement. The pinion
is
fitted to the sleeve -
the inner race
of
the
dutch
- and held in place
by a snap ring.
Five clutch rollers are fitted between the outer
race ( thrust splines) and inner race (sleeve)
of
overrunning clutch, each being pressed against
the cam face internally formed
of
the outer race
by a spring.
Thus the drive or torque
is
transmitted from the
armature shaft through the reduction gears, pinion
shaft, thrust splines (clutch outer race), rollers and
sleeve (clutch inner race) to the pinion.
(3) Overrunning clutch operation
Pinion meshed in
flywheel
1-0uter
race
2-Roller
3-Spring
Engine starts
4-lnner
race
5-Pinion
(a) Pinion meshed in flywheel
As
the outer race rotates, the rollers are jammed
tight between the inner and outer races to lock
these races. Now the torque from the armature
is
transmitted from the outer race to the inner
race and then to the pinion.
(b) After the engine starts, it spins the pinion (inner
race) faster than outer race. The rollers are
ro-
tated into the free state by the springs to unlock
the inner and outer races. This allows the pinion
to spin independently of, or overrun, the remain-
der
of
the clutch.
(4) Starter operation
-73
-
(a) Starter switch
(SW)
in OFF position
Main
contactor
Field
coil
Armature
T
-.L
Battery
1
(b) Starter switch
(SW)
turned to
ON
position
Armature
T
-.L
Battery
!
The plunger
is
pulled. This allows the lever
to
push
the pinion into mesh with the flywheel ring gear.
Now the starter begins to crank the engine.
(c) Starter switch
(SW)
in
ON
position
(with contact or closed)
T
Starter
switch
(SW)
-.L
Battery
!
Main
contactor
, ,
Field
coil
Armature
A large current flows into the motor. The starter
now cranks the engine with full force while picking
up speed at the same time.
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