Injection Nozzle; Governor - Kubota D1102-B Workshop Manual

(Al Injection Nozzle
(f )
0011F046

Governor

(A)
0073F020
Injection pump
(a)
(bl Goernor spring
Torque spring
(c)
(d) Governor balls
(e) Fork lever 2
Fork lever 1
(f)
(g) Governor sleeve

4-4 INJECTION NOZZLE

The nozzle is a throttl e-type one, it f eatures l ow f uel con-
sum ption a nd works wel l with K u bota's spherica l combus-
tion chamber.
The nozzle valve open i ng pressu re is abou t 13.7 to 14.7 MPa
2
(140 to 150 kgf /cm
,
comes the cou nterforce of nozzl e val ve spri ng ( b) , and push
the val ve ( e) u p i nsta ntl y, the f uel is then i njected i n a pro-
per qua ntity i nto the swirl i ng a i r i n the combustion cha mber
(f ) for combustion. Add ition or red uction of sh i m ca n adjust
the openi ng pressure. A sh i m of 0.1 m m corresponds to
2
980 kPa ( 1O kgf /cm 142 psi) cha nge i n open i ng pressu re.
,
(a) Adjusting Washer
(b) Nozzle Spring
(c) Push Rod
(dl
Nozzle Nut
(el
Needle Valve
Combustion Chamber
(f)
(gl Fuel Overflow Nipple
(h) Fuel Overflow pipe
4-5 GOVERNOR
The engi ne f eatu res K u bota's excl usive ba l l-ty pe va ria bl e
speed governor a nd a torq ue spr i ng is prov ided to i m prove
engi ne torq ue performa nce a nd to prevent engi ne from stal l-
i ng i n case of overload.
How works:
it
When the speed control l ever is set at its ma x i mu m posit ion,
the governor spr i ng ( b) pul Is the control rack towa rd the
maxi mu m quantity th rough fork l evers 1 and 2 (e, f ). But as
the engine speed i ncreases, the governor bal ls (d ) on the ca m-
shaf t, by its centrif uga l force, move outwa rd a nd push back
the fork lever 1 a nd 2 th rough the governor sleeve ( g) . The
control rack position wil l be decided when the force created
by governor ba l l s eq ual s the cou nterforce of the governor
spri ng.
As the engi ne speed d ecreases, the centrif uga l force d i m i n i-
shes a nd the ba l ls move i nwa rd. As a resu l t, the governor
spr i ng tension pu l l s the control rack for i ncreasi ng the f uel.
Due to the ba la nce between spring tension a nd centr if uga l
force of governor ba l ls, a near l y constant engi ne speed is
obta i ned.
22
1990 to 2130 psi) , the pressu re over-
KiSC issued 09, 2007 A