Chapter 3 Fuel Injection Equipment
1. Fuel Supply System
4LHA Series
Furthermore, the angleich spring is gradually com-
pressed
as the engine speed rises. This is because
the increased governor weight
thrust
load exceeds
the angleich load before high speed control is ef-
fected.
When the governor lever and the bottom of
the tension lever come
into
contact (end of angleich
stroke), the injection volume is reduced by
that
amount, and the rack reaches the rated position
(RE).
Control lever position
Rated
speed
setting
Full
load stopper
Tension
lever
Angleich
spring assembly
Injection
volume
Increase Decrease
Governor
lever
Angleich
stroke
(
with
angleich spring
V
Engine
speed-
(6) Necessity of
torque
spring and
function
Engines
used in construction machinery are sub-
jected to sudden loads which cause a decrease in
speed
and sometimes result in stopping of the
engine.
A torque spring is provided to move the
control rack for a higher injection volume when
engine speed falls. The higher torque can withstand
overloads and prevent the engine from stopping.
The governor control lever is fixed at point G in
the diagram on the
right,
the continuous rated
output
position. If the engine is loaded, the tension
lever encompasses the torque spring, the control
rack comes away from
full
load stopper, and this
fluctuates between G and H according to engine
load.
If the load on the engine exceeds the continuous
rated
output,
the speed falls and the governor
spring tension exceeds the governor weight
thrust
load to overcome the torque spring set load. The
tension lever then gradually causes the control rack
to increase the injection volume. The torque rise
stroke ends when the control rack reaches F'.
Cam
speed
Control lever
rated speed position
Torque spring
Torque rise stroke
Injection
volume
Increase Decreas<
3-2-13
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