1-M20
BX1800 · BX2200, WSM
ENGINE
[6] GOVERNOR
(1) D722-E-BX
The governor controls the amount of the fuel to be fed
in the entire speed range to prevent the engine from
changing its speed according to the load.
The fork lever 1 (3) is held where two forces on it are
balanced. One is the force that fork lever 2 pushes,
which is caused by the tension of the governor spring (4)
between the governor lever (1) and fork lever 2 (5).
Another is the component of the centrifugal force
produced by the steel balls (6) which are rotated by the
fuel camshaft (10).
■ At start
The steel ball (6) has no centrifugal force.
Fork lever 1 (3) is pulled by the start spring (2) and the
control rod (13) moves to the maximum injection position
for easy starting.
■ At idling
When the speed control lever (12) is set at the idling
position, the governor spring (4) is pulled slightly.
As the camshaft rotates, the steel ball (6) increase
their centrifugal force and push the governor sleeve (7).
Fork lever 1 (3) pushed by the governor sleeve, pushes
the control rod (13) and the control rod compresses the
idling adjust spring (11).
The control rod is kept at a position where the
centrifugal force is balanced with the spring tensions on
the control rod, providing stable idling.
W1019390
■ At medium or high speed running
When the speed control lever (1) is turned further, the
governor spring (2) increases the tension and the control
rod (3) is pulled to increase the engine speed.
The steel ball (4) increase their centrifugal force and
the control rod is pushed, decreasing the engine speed,
until the centrifugal force and the spring tension are
balanced.
When the engine speed is dropped with the increase
of the load, the centrifugal force of the steel ball
decreases and the control rod is pulled. The amount of
the fuel to the injection nozzle is increased to produce a
higher engine torque required for the load.
W1019615
(1) Governor Lever
(2) Start Spring
(3) Fork Lever 1
(4) Governor Spring
(5) Fork Lever 2
(6) Steel Ball
(7) Governor Sleeve
(8) Steel Ball
(9) Governor Ball Case
(10) Fuel Camshaft
(11) Idling Adjusting Spring
(12) Speed Control Lever
(13) Control Rod
(1) Speed Control Lever
(2) Governor Spring
(3) Control Rod
(4) Steel Ball
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