Kubota D650-B Handbuch Seite 70

[B] At idling
0076F017
• At idling
When speed control lever is set at idling posi­
tion after the engine is started, high speed
governor spring 1 does not work at all and
also low speed governor spring 2 does only a
little action. Therefore, governor sleeve is
pushed leftward by a centrifugal force of
ball weights. Fork lever 1 and control rack
are moved leftward by the sleeve and then
idling limit spring is compressed by control
rack. As a result, the control rack is kept at
a position where a centrifugal force of ball
weights and forces start spring, governor
spring 2 and idling limit spring are balanced,
providing stable idling.
(1) Speed control lever
(61 Fort< lever 1
(2) Governor spring 1
(71 Control rack
(3) Governor spring 2 (8) Idling limit spring
(41 Ball weight
(91 Start spring
(6) Governor sleeve
(C) At middel/high speed running
00 76FOI 7
• At middle/high speed running
The engine speed is controlled when the
tension of governor springs 1 and 2. which
are pulled speed control lever. and the
centrifugal force of ball weights are balanced.
When the speed is reduced (A ~ B) with load
increased (a
~
bl, the centrifugal force of
ball weights becomes smaller than the ten­
sion of governor springs 1 and 2. As a result,
the control rack is moved rightward and fuel
injection amount is increased to produce an
engine torque required for the load. (a ~ c)
(11 Speed control lever
(21 Governor spring 1
(3) Governor spring 2
(4) Ball weights
{OJ When load is increased
(11
(31
t
lfil
(1) Engine toque curve
(2) Small load torque curve
(21
B_A
(31 Large load torque curve
(41 _ _
(4) Engine R.P.M
(6) Torque
74