Sk200-6 Pump & Regulator Explaining
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Transcript of Sk200-6 Pump & Regulator Explaining
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7.HYDRAULIC COMPONENTS
7-1 Hydraulicpump
1. Appearance
a3 Dr PNl
7a5 PHl
i;
1
a5
0
i
PSVl
PSVl
Boltfor Back-up(M8)
a8 PSV2 PH2a6
./a
a9 PNBolt for Back-up(M8)
uLAEIpTa.a9
@
al Bla2
a5
/PH2
A3
3
PN
2
a9
K&
* @
#a
Dr3
*
W
*
a6
&
PNl
/
103 7-1
A3
-
2. Hydraulicdiagramof main pump
(FRONT) PSrla.A.a5PNl.I-T--
tnr;a8PNl
+_
I-J Il
_J
ll
a3
+
t[i_
J
PSV2A2a2 pN2a6
]
(REAR)
L
+
____J l
._L
1._+
a9
PN2
a41
rI -
l
lt ---
L
Dr BI B3 Dr3 A3
a7
unitMode] SK200-6 SK230-6 SK320-6
ModelMainpump K3Vl12DT-1RAP-9TIL K3Vl12DT-1RAP-9TOLK3Vl12DT-1RAP-9TOS
Gearpump ZXIOLGRZ2-06D
Displacementcc/rev 1052/10(Gearpump)1152/10(Gearpump)
Ratedspeed(Rotationdirection)min-1(rpm)
2,200(2,200)(C]ockwiseviewedfromshaftend)
2,100(2,100) 2,200(2,200)
Highid]ingmin-1(rpm)2,220(2,220)orlovv 2,300(2,300)orJovv 2,385(2,385)orlow
RatedpressureMPa(kgf/cm2)
Mainpump 34.3(350) I
Gearpump 4.9(50)
ATTboostpress.MPa(kgf/cm2)37.8(385)
rax8.flogT/rcaX)L/min2102/20(G.P) 2382/21(G.P)2502/22(G.P)Max.inputpowerkW(PS)
106.6(145)(incude 129(175)(include177(240)(includegearpumpinputtorque)gearpumpinputtorque)gearpumpinputtorque)/3.4(4.6)(gearpump) /3.4(4.6)(gearpump)/3.4(4.6)(gearpump)
.T?qxlnputNm(kgfm)509.6(52)(include 588.4(60)(incJude 735.3(75)(includegearpumpinputtorque)gearpumpinputtorque)gearpumpinputtorque)/14.7(1.5)(gearpump)/14.7(1.5)(gearpump)/14.7(1.5)(gearpump)
!inmnie.r.P.rceaSsSiunrgeMPa(kgf/cm2)AverageO.1(1)SurgeO.39(4)OilquantityincasingL 2.8 -
Controlcharacteristic Nega-Con/Totalpowershiftcontro]
WeightkgMainpump 125 126 I
Gearpump 1.6 +J
Note:G.P is Gearpump.
104 7-2
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3. Structure
1)Mainpump53S ?B9
953
261
4C6
74
111
127
123
10
251
?32 532 214548 531 534 724 8CB
ILL-:_-:_1
A
I
U
901 954 1? 151 1S2
BB8
113
211
0
itJ_
I+
r`
).,-__
l
I
_-
212 49O ?17 153 1S6 1S?981
Code Name Q'ty
111Shaft(Front) 1
113Shaft(Rear) 1
114Sp]inejoint 1123 Rol[erbearlng
I
2
124 NeedlebeanngI
2
127I
BearlngSPaCer 4
141Cy)inderb[ock 2
151 Piston 18
152 Shoe 18
11i3Retainer 2156 Sphericalbushing2
157
Cylinderspnng 18
11Shoep[ate 2212Swashplate 2
214 Tiltingbushing2
251Support 2
261 Sealcover 1
271
Pumpcaslng 2
312 Valveblock 1
105
3 3 488
312 114 12 886
Code Name Q'ty
313Valveplate(Front)1
314Valveplate(Rear)1
325Cover 1
401Socketbot(M20210)8
406Socketbolt(M820)4
407Socketbolt(M630)3
466VPplug(PFl/4)2
468VPp]ug(PF3/4)4
490P)ug(Meek) 20
531 TiltingplnI
2
532 Servopiston 2
534Stopper(Large)2
535Stopper(Smal))2
546 Spacer 2
548 Feedbackp]nI
2
702 0IngI
2
7100-ring(JISB2401-G95)1
7170-ring(JISB2401-G145)4
7240-ring(JISB2401-P8)16
7-3
546
88S 314 141 211
325 ?2S
l I
rlI l
401
VW A
Code Name Q'ty
7250-ring(JJSB240l-Pll)7
7280-ring(JISB240l-P24)4
732 0-ring 2
774 Oi[sea] 1
789Back-upnng
2(J]SB2407-P18)
792Back-upr]ng
2(J[SB2407-G35)
806Nut(M16) 2
808Nut(M20) 2
824 Snaprlng
2
885Pin(812L) 2
886 SprlngPlnIll
4
901Eyebolt(M10) 2
953Setscrew 2
954 Setscrew 2
981 Nameplate 1
983 Rivet 2
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2)Regulator
Structureof reguator
85
B9?
612
12
B
755 858
e:.'3:;A LB
614
615
813
811
VALVE ASSY. SOLENOID
YN35VOOO18F2)
646
?33
734
855
653
81
81
831
898
?32
4&
496 418
643 00
Section BB
644 645 7 8
92
801
E
654 836 851652 601624
Botfor back-up(Regularposition)
Bolt for back-u
Section DD
545
543
Section EE
(1nback-upcondition)
7-4
l
1l
Lal
625
Section AA
801
925
627
732
56
629 6) 628
626 887 763
-
-
I I
l
View C
Jr-
II
a3
PNl
P2
_J
+
Hydrauic diagram
438
l1
1+
-
Code Name Q'ty
412 scketbott(M850)2413 Socketbolt(M870) 2
418 Socketbo]t(M512) 2
436 Socketbolt(M650) 5
438 Socketbo[t(M620) 4
439 Socketbolt(M640) 4
466 VPplug(PFl/4) 3
467 Plug(PF3/8M8) 1
496 PIug 18
541 Seat 2
543 Stopperl 2
545 BalI 2
60lI
Caslng 1
611 Feedback[ever 1
612 Lever(l) 1
613 Lever(2) 1
614 FulcrampTug 1
615 Adjustplug 1
621 Compensatingpiston 1
622I
Pistoncas[ng 1
623 Compensatingrod 1
624 Springseat(C) 1
625I
Outersplng 1
626
lnnersprlng 1
627 PIunger(C) 1
628 Adjustscrew(C) 1629 Cover(C) 1
630 Locknut 1
63l Pfsleeve 1
641 PiLotcover 1
642 Rod 1
643 Pilotpiston 1
644 Springseat(Q) 1
645 PIunger(Q) 1
646 Pilotsprlng
1
651 Seeve 1
652 Spoo) 1
653 SprlngSeatI
1
4 IReturnspnng 1655
Setsprlng 1
656 Portplate 1
708 0-ring(JISB2401-G75) 1
722 0-ring(JISB2401-P6) 2
724 0-ring(JISB2401-P8) 12
725 0-ring(JJSB2401-Plo) 1
727 0-ring(JJSB2401-P14) 1
728 0-ring(JISB2401-P18) 1
107
Code Name Q'ty
730 0-ring(JISB2401-P22) 1
732 0-ring(JISB2401-P16)2733 0-ring(J[SB2401-P20) 2
734 0-ring(JISB240l-G25) 1
753 0-ring(JJSB2401-P9) 1
755 0-ring(JISB2401-Pll) 6
756 0-ring(J[SB2401-P26) 2
763 0-ring(JISB2401-G35) 1
801 Locknut(M8) 3
814 Snapring(JISB2804SR-15)1
836 Snaprmg
1
858 Lockingring(J[SB2804RR-15)2
874 Pin(411.7L) 1
875 Pin(48L) 4
887 Pin 1
897 Pin(419L) l
898 Pin(6.59L) 1
924 Setscrew 1
925 Setscrew(Ql) 1
079 So)enoidvalve 1
Tightemngtorque
Code SizeTorque
Nm(kgfm)412,413 M8 29.4(3)
436,438,439 M6 ll.8(1.2)
466 PFl/4 36.3(3.7)
467 PF3/8 73.5(7.5)
496 NPTFl/16 8.8(0.9)
630 M301.5 156.8(16)
801 M8 15.7(1.6)
7-5
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Operationofregulator
HORSE POWER
COMP[NSTING LEVER
CONTROLPART
/
IlI
I
NEGATVECONTROL LEVER
r`
,A/ l
:@
*
SERVO PISTON
+
.+
OIL FLOWCONTROPART
F[DBACKLEVER
NGATIVE
CONTROSPOO SPOOL
lI
lI
I
l
L
J+ ...._.
-
-r
1
COMPENSAT(NG PISTON
I
i
Il
FEEDBACK LEVER
SERVO PISTON
COMPENSATINGROD
//
lJ
/
r
i
I
I
+
+
L=@l
!-+i)cT+
11
1
1. Feed back lever isconnected with3pins, spool attachingpin.Tiltingpin attachingtoservo piston, and pin reachingtolarge holesof negative controllever,and controllever.
2. Thenegative controllever isconnected with2pins,a pinfij(edon casing,andpinincontactwith negative control spoolgroovepart.
3.Thecompensatinglever isconnected with2pins,a pinfixedon casing,anda pin incontactwith compensating rodgroove part.
-
@ Conceptualdiagram forpump operation
Flowr8t8uP
Left
Large diameterSide
F)owratedown
Right
small diameterside
selfpressure
T8nkC Servopiston
Cylinder block
Self-pressure
SwashpJate
1 This isthemechanismtovarytheincationresultingfrommovmg servo piston right andleft.
2 That istherightmovementofservo pistonmakestheswsh plate vertical slightly reducingtheflowrate,andtheleftmovementmakestheincationof swash platelarger increaslng
theflowrate.
3.The diametersofservo pistonon rightandleftsidesdiffer,andare referredtoas the"smalldiameterside and"large diametersideforexplanation.
4. Onthesmalldiameterside,theself-pressureisalwaysgiven.
5. Now,theself-pressureisgiventothelarge diametersidelikethesmalldiameterside.Asa
result,theservo pistonmoves rightwardduetothedifferenceofarea reduclngthe flow
rate.
6.Byconnectingthelarge diametersidetotank, theservo pistonmoves leftward duetothedifferenceofpressureincreasmgtheflowrate.
7. Thepump havmgtheseactionsiscaueda variabledisplacementpump.
109 7-7
-
Regulatoroperation
532 SERVO-PISTON
LARGE DIAMFrER
651SLEEV
654 RETURNSPRJNG
652 SPOOL
621 COMPENSATINGP)STON
B98PJN
110
()
Pl
'
J
Cl
647 STOPPER
SMALL DIAMETER
@531T[LJtNGPIN
613 LEVERl611FEEDBACKLEVER
LEVER 1
/
/I
)
/
i(E)
875PJN
()
T
623COMPENSATINGROD
7-8
625OUTERSPRJNG
1NNERSPRING
874 PIN
646PJLOT SPRING
897 P
643P[LOTPJSTON
@531T)LT[NG P(N
548FEED BACK PIN
-
@ Conceptual diagramof regulator operation([ncaseof negativeflowratecontrol)
Selfpressure
@ Sleeve
Spool
Servopiston
C)
Large di8mete
Self-
l
A
/
l
reSSur
/
Smal
e)
I diamete
Negativecontrolpressure
Swashplate
Negativecontrolfever
Sprin
=+/
IJ
NegativecontrospooJ
Feedback ever
Theregulatorcan becontrolledbytaking thebalance forthe hydraulic forceandsprlngforce.
Eachregulatorisconnected withplnS.
1. Thenegative controllever isjoinedbypin securingthecasing and pin incontactwitha grooveofthenegative control spool.
2. The feedback lever isjoinedbypin attaching spool,tiltingpin attachedon theservo piston and pin throughuptothelarge holeparton thenegative controllevercompensatinglever.
3 Whiletheoperationlever issetinneutral,thenegative controlpressure rises pressingthespring,andmoves thenegativecontrol spool rightward.
4. Thenegativecontrollever moves rightwardmakingthepinsecuringthecasingtoful-Crum.
5. Then,thefeedback lever moves rightwardmakingthe tiltingpintofulcrum.
6.Therefore,thespool moves rightward.
7. Themovementof spool enablestheself-pressuretoreachtothelarge holeside ofservo
piston,andmoves theservo piston rightwardduetothedifferenceofarea.
8 Thetiltingangle of swsh plateisveryclosetovertical reducingtheflowrate.
9 Besides, bymovingtheservo piston rightward,thefeedback lever moves makingthepin tofulcrummog thepin 1eftward Therefore,itsmovement stops attheanglecorrespondingtothenegative controlpressure.
111 7-9
-
compensationcontrol(1)
COMP[NSrlNG ROD
PI CLI-- -
-
I
I
I
I
l
i__
COMPENSATING SPRING(
COMPENSATING SPRING
COMPENSTINGPITON
L
-
+ -
-
FOMIpL,puMP+-
Pl:Deliverypressure,P2:Companionpump pressure
P,(P,)PUMPDELIVERY PRESSURE
1. The deliverypressure(Pl)and companionpump pressure-(P2)actuatescompensatingpiston.
2. And,try tomove thepistontorightbyturnmgthecompensating rod.
3. However,as thespringforceof compensating spring isstrongerthan thatof piston,theflow inmaximumis delivered.
-J l
....1..l
L
L
LJl
_1_+ +
]T-
112 7-10
-
compensation control(2)
RETURN SPRING
COMPENSATINGVERSPOOL
COMPENSANG ROD
PI CL
COMPENSNGSPRING
COMPNSNG
SPRING@
L
P2
COMPNSnNGP!STN
LARGEDIAMETERCHAMBER
L37.R=
=PISTON
`
FEEDBACKEVR
9
f--.
SMALL DIAMETERCHAMBER
SWASH PLATE
Pl:Deiverypressure,P2:Companionpump pressure
Pl
Smalldiameterchamber;Alwaysactuatedbyself-pressure(Pl).
1. As thedelivery(Pl)and companionpump pressure(P2)is highertheforceofcompensat-ingspring.
2. Thecompensating rodmoves toright, and,
3.pin atcompensating rodgroove partalsomoves toright.
4. Then,compensatinglever ismovedtorightfulcrumthe fixedpinforcasing.
5. Pin alsomoves toright.(Feedback lever ismoved.)
6.Pin isconnected withthefeed back lever,so thespoolisalso movedtoright.
7. Pl(Delivery)CL- Large diameterchamber.
8. DeliverypressurePlactuatesboth faces(largediameter,smaudiameter).thentheservo
pistonmoves torightduetothedifferencearea.
9. Servopistonis directlyconnected withtiltingplate, andtheswash platewillbecloser and
closer perpendiculartothepiston.
10.The delivery flow isreduced.
113 7-ll
-
Compensationcontro(3) (Atsteadycondition)
RTURN SPRING SPOOL COMPENSATING LEVER
PI CLr-
1
L_
COMPNSANG SPRING
COMPENSATING SPRING
P2 Pl
SERVO PJSTON
L
_
..
----
J:
T-
FEEDBACKEVER
WASH PLATE
1.As soon astheservo pistonmoves toright,thefeed back leverconnected with pin alsomoves toright.
2. Pin moves toleft fulcrumthepin. (Spoolmoves toleft.)
3. (Pl)and(CL)portsareclosed.
4. Then,the tiltingplate winbesteadyon theangle corresponding platetothesummedpres-sure ofdeliverypressure(Pl)and companionpressure(P2).
114 7-12
-
@ Compensationcontrof(4) (Oj[f]owincreasing)
COMPENSJING LEVER
RTURN SPRING SPOOL
Pl
6;
COMPENSATING SPRJNG
COMPNSATING SPRING
P2 Pl E
COMPENSATINGR D
L..=
/
- l-
--. .-1
FEED BACK LEVR
a
Pl
1. Whenthesummedpressureofdelivery(Pl)andthecompanionpump pressure(P2)becomelowpressure.
2. Thespringpowerof compensating spring and isstrongerthan thesummedpressure,thecompensating rodismovedtoleft.
3.Pinalsomoves toleft.
4. Then,thecompensatinglevermoves toleft fulcrumthefixedpin forcasing.
5.
6.
7.
8.
9.
And,spoolismovedtoleft byreturn sprmg.
Largediameterchamber- CL- T (Tank).
Servopistonmoves toleft.
Theswash plate anglebecomes large.
The delivery flow is increased.
115 7-13
-
Powershift control
PIN
Pf
Pl CL
- `
I I
t>_
P2 Pl
L..(
-
P,
=
Pf:Powershiftpressure(M A B)
1. Controllerrecognizes audiggingmodes.
2. However,thepowershiftpressurecomingfromthesolenoid valveis fixed.
3. Thepressurecorrespondingtotheenginehorsepower(powershiftpressure)isconductedtoPl byactuating ofenginespeed sensing.(MechatronicsE.S.S)
4. Compensatingpistonmoves torightthroughpin.
5. Therefore,enginehorsepowerandpump horsepowerwbe fixed.
116 7-14
-
Negative flowcontrol
SLVE
RETURN SPRING
/ I
I
SPOOL
tl l
NGAVE CONTROLLVER
PI CLr-TI,I
_
Pi
I
IJl
_I =>
NEGATIVECONTROL SPOOL
NEGACONTR SPRING
L
I
ILARGEJDIAMETERCHAMBER
1'SRVOPISTON
+.._
FEED BACK[VR
'
SMA
T--
CHAMBER
ETER
SWASH PLATE Pl
Pi:Negativecontrol pressure,Small bore:OnepumpPIpressureactson itconstantly
1. Thenegative controlpressurerises.
2. Thenegative control spoolmoves rightward.
3.Pin on thenegative control spoolgroovesectionmoves rightward.
4. Then,thenegative controllevermoves rightwardtakingsecuring pin tothecasingas asupport.
5. Pin moves rightward.
6. Becausepin isconnectedtothefeedbacklever,thespoolalsomoves rightward.
7. Pl(Selfpressure)CL- Large bore.
8 Onepump pressurePlactson both facesofservo piston, andtheservo pistonmoves righ
ward.
9 Becausetheservo pistonis directlyconnected withtheswashplate,theswash plate
approaches verticauy.
10.The delivery flowratereduces.
And, thefeedback leverconnectedwith pin moves rightward concurrentlywiththemovementofservo pistonin ltem8,andthespoolmoves leftwardtakingpin as asupport.Toclosethe PlandCLports.
Therefore itis heldattheangle of swshplate correspondingtothenegativecontrolpressure.
117 7-15
-
Regulator operation Comparison when controlling pump propor- tional valve and back-up operation
1 ) Pump proportional valve control @ This is loaded flow rate control (negative
control) type that the delivery flow rate reduces when secondary pressure (Pi) of pump proportional valve rises.
@ Under the condition where the rod (642) is tightened, (See Figure), pump proportional valve secondary pressure (Pi) is led in pilot piston (643) and controls the pump delivery flow rate.
@ Pilot pressure (PSV) enters from the left a8 side, and is closed in A chamber with rod PN1 (642).
@ Negative control pressure (PN1) enters 1 ) Pump propo. valve from right side, and is closed in B controlled chamber with rod (642).
Therefore, the pump delivery flow rate is varied by the negative control/compensating 643 pressure which is calculated by deducting back pressure (Tn2) from negative control pressure (PN1).
PSV 2 ) Buck-up control function @ When CPU mechatro controller fails, re-
laxes rod (642) (See Figure), and the function changes into hydraulic pressure C' 642' TO piiot piston control. at propo. valve
control led @ The secondary pressure (Pi) circuit of the
pump proportional valve closes due to the movement of rod (642).
@ With the rises of one pump delivery pres- sure P1 and other pump delivery pressure, the pump delivery flow rate is reduced 2 ) When controlling automatically, and controls the input back-up function torque constant. (When the number of rotation is constant, the input power becomes constant.) 643
@ Pilot pressure (PSV) enters from the left side, and is led from A and C chambers P I : Self press. into pin (898), and acts on compensating P2 : Other press. piston (623), and finally the power is con- PSV: Pilot press. trolled to the constant power. PN1: Nega-Con press.
Therefore, the pump delivery flow rate is Pi : Secondary press, of propo. valve controlled by acting pilot pressure (PSV) 623 : Compensating piston and negative control pressure (PNl), and 642 : Rod (Screw) one pump pressure (PI) and other pump 643 : Pilot piston pressure (P2) on the compensating piston 898 : Pin (623) and pilot piston (643).
-
3)Gearpump(Forpi[otcontrol)
10 7 354 351
435 361 353
Drain
Suctionport:PF3/4
434
312
311
32
)9
ort:PF3/8
Oppositeside Sideof
Det
310
ofcauJkingcaulking
ailoffiJter
Code Name Q'ty
307 Poppet l
308 Seat 1
309 Spnngseat
l
310 Sprlng
1
31l Adjustscrew 1312 Locknut 1
351 Gearcase 1
353 Drivegear 1
354 Drivengear 1
355 Filter 1
361 Frontcase 1
433 SocketboJt(M840) 2
434 Socketbolt(M855) 2
435 Socketbolt(M820) 4
466 Plug(PFl/4) 1
467 Adapter(PFl/2-PF3/8) 1
700 SquarenngI
1
710 0-ring(JJSB2401-G95) 1
725 0-ring(JISB240l-Pll) 1
728 0-ring(JISB2401-P18) 1
732 0-ring(JJSB2401-P16) 1850 Lockingring(JJSB28041RR-18)1
119
////////
435
-
- -
----
////
///
7,/
(:@
-
l
DeliveryportPF3/8
433
lltl
/I;=
307 )8355 4& 850 66725 2867
Note:
1. Afterassembly of gear pump, checkthatthedrivegearrotatessmoothlyat0.1 N.m
(1.Okgfm)oess.2 Afterassemb)y of gearpump, apply oil
sufficient(yon thesliding section.
3 Bringtheoppositesideofcaulkingofthefi[tershownintheleft figure intocontactwjththe insertendface,paylngattention
totheinstallingdirection.
A3
a3
II
l
,_..!IlI
Il
l
l
l
1I
!,,I
L__TlJB3
Hydrauliccircuit
Tighteningtorque
Dr4
Code ThreadsizeTorqueNm(kgfm)
312 M141.5 29.4(3.0)433,434
M8 16.7(1.7)435466 PFl/4 15.7(1.6)
7-17