DIESEL
ENGINE
05
SERIES
WSM,
01641
[6]
AUTOMATIC
ADVANCE
TIMER (not included
in
the
basic
model)
~0164OFlOOQO
I
01
640F10130
Fuel fed by the injection pump passes through the
injection pipe to the injection nozzle. The time required
for fuel
to
flow from the injection pump
to
the nozzle is
almost constant, irrespective of enginespeed. The time
required for injected fuel to ignite, burn and reach the
maximum pressure is also virtually constant, irrespective
of engine speed. Therefore, as engine speed increases,
ignition timing is delayed, and vice verse.
If
fuel injection
timing is fixed, it is impossible to provide optimum
injection timing at each engine speed. To solve this
problem, an automatic injection advance timer is used to
control fuel injection timing automatically. This engine
uses a mechanical timer for this purpose which utilizes
the balance between the flyweight's centrifugal force
(generated by engine rotation) and spring tension.
The structure of the timer
is
as illustrated
in
the
figure.
Hub
bolt (8) is inserted into the hole located on one
side
of
flyweight
(6).
Hub
(7)
is secured to fuel cemshaft
(1)
by key and nut. Driving plate
(3)
is bolted to injection
pump gear
(2).
Driving bolt (4) securing driving plate
(3)
is
in
contact with the curved surface of flyweight
(6).
Timer spring
(5)
is installed between driving bolt
(4)
and
hub bolt
(8).
Therefore, torque is transmitted from the crankshaft
to the fuel camshaft via the follwoing route
:
Crank gear
(9)
4
Idle gear
1
(IO)
-+
Injection pump
gear
(2)
-+
Driving plate
(3)
4
Driving bolt
(4)
3
Flyweight (6)
-+
Hub bolt
(8)
4
Hub
(7)
4
Fuel camshaft
(1)
Fuel Camshaft
(7)
Hub
(2)
lnejction
Pump
Gear
(8)
Hub
Bolt
(3)
Driving
Plate
(9)
CrankGear
(4)
Driving
Bolt
(IO)
Idle
Gear 1
(5)
rimer
Spring
(1 1)
Idle
Gear
2
(6)
Flyweight
(12)
Governor Gear
(1
1
0164OM10040
M-37
Redistribution or publication of this document,
by any means, is strictly prohibited.
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