Chapter 9 Electrical
System
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____________________________
3.4JH3(B)(C)E
4. Alternator
Standard, 12V/55A
The
alternator
serves
to
keep
the
battery
constantly
charged.
It
is installed on the cylinder block by a bracket,
and is driven from the V-pulley at the end
of
the crankshaft
by
a V belt.
The type of alternator used
in
this engine is ideal fur
high speed engines with a wide range
of
engine
speeds. It contains diodes that convert AC
to
DC, and
an lC regulator that keeps the generated voltage con-
stant even when the engine speed changes.
4-1 Features
The alternator contains a regulator using an IC, and has
the following features.
(1) The IC regulator is self-contained, and has no moving
parts (mechanical contact points)
It
therefore has supe-
rior features such as freedom from vibration, no fluctu-
ation of voltage during use, and
no
need
for
readjusment
Also, it is of the over-heating compensation
type
and
can automatically adjust the voltage to the most suit-
able level depending on the operating temperature.
(2) The regulator is integrated within the alternator to
simplify external wiring.
(3) It is an
alternator
designed for compactness, light-
ness of weight and high output
(4) A newly developed U-shaped diode is used to provide
increased reliability and easier checking and mainte-
nance.
(5) As the alternator is to
be
installed on board, the follow-
ing measures are taken to provide salt-proofing.
1) The front and rear covers are salt-proofed.
2) Salt-proof paint is applied to the diode.
3) The terminal, where the inboard harness is connected
to
the alternamr. is mckel plated.
4-3
Characteristcs
15
100
I
.
12
...
80
>
~
a,
...
~
Cl
9
$
0
>
60
c
~
4-2 Specifications
Model of altern~tor
Model of
IC
regulator
Battery voltage
Nominal output
Earth
polarity
Direction
of
rotation
(viewed from pulley
end)
Weight
Rated
speed
Operating speed
Speed
for
13.SV
Output current
at
20°C
Regulated voltage
I
!
Regulated
voltage
i
I
!
I
I
'O
a,
i
:5
---
Output
current
for
13.SV
>-
u
/"
I
OJ
:5
6
Cl
a,
a:
:5
I
~
_g.
40
::,
V
0
3
20
I
~
I I
I
0
0
0
2
4 6 8 10
12
Speed
of
alternator
(rpm)
9-22
LR155-20 (HITACHI)
TRIZ-63 (HITACHI)
12V
12v/55A
Negative earth
(0)
Clockwise
4.3kg
5000
rpm
1000
~
9000
1000
or
less
over 53A/5000
rpm
14.5±0.3V(Standard temperature
voltage gradient,-0.01/"C)
14X10
3
Printed in Japan
HINSHI-H8009
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