Chapter
3
Fuel Injection Equipment
1. Fuel Supply System
4LHA Seri
1-5 Governor construction
Diesel
engines are used in extremely varied conditions,
with
a wide range of loads and rpms. The governor
has
the important function of controlling the fuel
injection quantity. It quickly responds to changes in
rpm by adjusting the position of the control rack.
YPES-AL
fuel injection pump is equipped
with
the é
speed
type governor. The governor is available in
types: one has the torque rise spring (angleich sprini
(Fig.
1), and the other has the smoke cut sprir
(angleich spring) (Fig. 2).
Fig.
1 Governor
with
torque rise spring
Governor
spring
Tension
lever
Fuel
limit
bolt
(Stopper)
Speed
control
lever
Angleich
spring
Shifter
Excess
fuel spring
(Start spring)
Governor
weight
The governor weight is mounted on the end of the fuel
injection pump cam shaft. It rotates around the
governor support pin, driven by the cam shaft, and is
forced outwards by the centrifugal force acting on the
weight.
The
thrust
force on the cam shaft due to this
cen-
trifugal
force acts on the lower part of the tension
lever via the
sleeve.
An
excess
fuel spring for starting
is
mounted on the bottom of the tension lever.
One
end of the governor spring is hooked to the
right
upper end of the tension lever, and the other end to
the spring lever on the control lever shaft.
The spring lever and control lever are mounted on the
same
shaft, so by turning the control lever towards
full, the governor spring is pulled and the load gradual-
ly
rises.
The tension lever can move freely around the governor
shaft on the player bearing. As the speed increases and
the shifter is pushed to the
left,
the tension lever
rotates clockwise. And when the speed falls, the
tension lever rotates counterclockwise.
The governor lever rotates smoothly on the same
governor shaft. The bottom part of this lever is in
contact
with
the sleeve through the shifter, which is
itself in contact
with
the bottom of the tension lever
through the
excess
fuel spring. It therefore moves
with
the tension lever according to the rise or fall of the
engine
speed.
The top of the governor lever is connected to the fuel
pump control rack through the governor link. The
movement of the lever controls the volume of fuel
injected by the pump. As the speed increases, the lever
rotates clockwise and moves the control rack to reduce
fuel,
and when the speed falls the lever rotates counter^
clockwise
to cause the control rack to
pass
more fuel.
Thus,
the engine speed is controlled.
The top of the tension lever comes in contact
with
the
stopper
built
into
the top of the governor
case
to
limit
the maximum fuel injection volume.
3-2-5
To Next Page
Loading...
Need help?
General
