Hyundai Dash 9 Posi - Nega sytem

Hydraulic System R210LC-9

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Hyundai Training Center

Pump Assembly Pi1=Neg. Control Pm1=Flow Cut Off Regulator 1

Regulator 2

Pi2=Neg. Control Pm2=Flow Cut Off EPPR Pressure EPPR Valve

P1 Front

35 bar

P2 Rear -2-

Pilot Pump Hyundai Training Center

R210LC-9

1. Main Pump 1-1. Hydraulic circuit

Pi1

Pi2

Horsepower Control Function

Flow Control Function

-3-


R210LC-9

P1

Pi1

P2

Pi2

1)P1,P2 : Main Pump

2)Pi1,Pi2 : Positive control 3)Psv : EPPR V/V

◀

▶

P1

P2

-4-


R210LC-9

Pi pressure-1

Low

High pressure

No work

Low

-5-


R210LC-9

Pi pressure-2

High

Low pressure

Work

High

-6-


R210LC-9

1-2. Check Valve

Pi1

Pi2

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R210LC-9

2. Pump Regulator 2-1. Function-1

1) Horsepower control function (negative system) Power Shift Control Pump self pressure and the other Pump Pressure 2) Flow Control Function (Posi-Nega Flow Control) (Pi1,Pi2) Control Qmax cut-off EPPR Control Horsepower control part Flow Control Part

-8-


R210LC-9

2-2. Function-2

1) Horsepower Control Function (Negative Control)

2) Flow Control Function (Posi-Nega Flow Control) - Pi pressure and Max. Flow cut EPPR. Control

- P1, P2, Pf Control

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R210LC-9

2-3. Regulator Circuit and Structure

Outer spring

Pi

Inner spring

Pf P2 P1

Pf (EPPR)

- 10 -

P2

P1

Drain


2-4. Horsepower Control (Negative Flow Control) 2-4-1. Overload protecting function

R210LC-9

When P1,P2 pressure rise up, compensation piston begins to push the rod balancing with spring force. When the hydraulic pressure exceeds the spring force, then hydraulic oil will be supplied to large chamber of servo piston and the pump discharge rate will be reduced.

Cylinder Pressure

Spring Force

(Discharge rate Decrease)

Pf

- 11 -


Q

rpm

?

HP ∝ P X Q

P - 12 -


R210LC-9

2-4-2. Recovery of flow

When P1,P2 pressure decrease, the spring force pushing the compensation piston rod exceeds the hydraulic pressure and shifts the compensation piston. Then large chamber of servo piston is connected to tank, that makes pump discharge rate increase.

Cylinder Pressure

Spring Force

(Discharge rate Increase) Pf

- 13 -


2-4-3. Adjustment of power

②

①

Screw Counterclockwise (Flow ↓)

Screw clockwise (Flow ↑)

① Adjustment of 1st power - Release lock nut of 36mm Screw clockwise (Flow ↑)

- Adjust screw of 24mm ② Adjustment of 2nd power - Release lock nut of 13mm

Screw counter clockwise (Flow ↓)

- Adjust rectangle screw Pressure

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R210LC-7A

2-5. Flow Control Function (Negative Control Function) 2-5-1. Flow decrease - RCV Lever neutral and fine control Pi increase

Pf P2

- 15 -


R210LC-7A

2-5-2. P-Q Graph (Relation between Pi and Flow)

Pilot flow control Screw

Screw : Counter clockwise (Flow ↓) Screw : Clockwise (Flow ↑) Pi1,Pi2

Flow control by controlling negative pressure (Pi1,Pi2).

- 16 -


2-6. Flow Control Function (Posi-Nega Control Function)

R210LC-9

2-6-1. Flow Increase - Operating Attachment Pi increase Pf P2

- 17 -


R210LC-9

2-6-2. Flow Control when operating RCV lever (Relief)

When any of main spools is changed over, the bypass circuit is cut off. The posi-nega conversion valve spool is not shifted. At this time, “PH” pressure discharged from “P3” pump will flow to regulator “Pi1” passing through posi-nega conversion valve and shuttle valve. That will make pump discharge rate increase.

Pi2 (Pump) Pi1 (Pump)

PH

Dr1

- 18 -

CENTER BYPASS


2-6-3. Posi-Nega Conversion Valve when RCV Lever is positioned at full position (Relief)

R210LC-9

MCV Center bypass

Pi1 (Pump) Low pressure can’t shift the Spool.

- 19 -


R210LC-9

2-6-4. Flow decrease - RCV Lever neutral and fine control

Pi decrease

Pf P2

- 20 -


R210LC-9

2-6-5. Flow Control when RCV lever is in neutral position

When hydraulic oil passing through the center bypass line increases, the posi-nega conversion valve spool moves to the left side. At this time, oil discharged from P3 pump will be blocked and Pc1 will be connected to the drain line, “Dr1”, it makes Pp11 line pressure lower and controls pump discharge flow rate to its minimum value.

PH

Dr1

- 21 -

CENTER BYPASS


2-6-6. Posi-Nega Conversion Valve when RCV lever is in the neutral position

R210LC-9

SPOOL shifted to the left

PC

Pi1 (Pump)

PH

Dr

- 22 -

P


R210LC-9

2-6-7. Posi-Nega Valve

MCV Center bypass

- 23 -


R210LC-9

Pilot Pressure and Discharge Rate Curve

Q

Posi-Nega

Negative

5-9

16-19

- 24 -

Pilot Pressure(bar)


2-6-8. P-Q Graph (Relation between Pi and Flow)

Pilot flow control Screw

Screw : Counter clockwise (Flow ↑) Screw : Clockwise (Flow ↓) Pi1,Pi2

Flow control by controlling negative pressure (Pi1,Pi2).

- 25 -


3. Pf (Power shift control by EPPR valve 3-1. Current and Voltage each Mode According to the mode, CPU sends EPPR valve the variable current value. So, swash plate angle is changed.

Eppr v/v pressure and current value by each mode

R210LC-9

R290LC-9

- 26 -


Q

P

S

P

- 27 -

Hyundai Training Page Center 27

R210LC-9

3-2. P-Q Curve

R210LC-9 P-Q curve 2

1900rpm, Pf=0(kgf/cm )

240

2

1900rpm, Pf=2.5(kgf/cm )

220

2


200

2


180

Q (lpm)

160 140 120 100 80 60 40 20 0 0

5

10

15

20

25

30

35

40

P (Mpa) - 28 -


R210LC-9

3-3. E/G RPM recovery by EPPR valve

E/G

PUMP rpm

EPPR

Unload: 1,950rpm Initial: 185mA, 2.5kg/cm2

↓ load : 1,900rpm

EPPR increase

P CPU S cluster Page 29

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4. MCV

R210LC-9

4-1. Spool Position-1

⑨⑧

⑦

② TRAVEL LIFT SPOOL

⑩ ⑪ ⑫

① TRAVEL STRAIGHT SPOOL

⑥

④

③

②

③ BOOM-1 SPOOL

①

④ BUCKET SPOOL ⑤ ARM-2 SPOOL

⑭

⑥ TRAVEL RIGHT

⑤

⑦ SWING SPOOL

⑭

⑧ SWING PRIORITY SPOOL ⑨ BOOM 2 SPOOL

⑮

⑩ OPTION SPOOL ⑪ ARM 1 SPOOL ⑫ BYPASS CUT SPOOL ⑬ BYPASS CUT SPOOL ⑭ HOLDING VALVE ⑮ ARM2 LOGIC VALVE

⑬

- 30 -


R210LC-9


(31) Swing Logic Valve (32) Arm-Port Relief Valve (37)(36) Posi-Nega Valve (35) Arm Logic Valve

(32)

(34)

(34) 2-Stage Option Port Relief Valve

(35)

(33) Option Port Relief Valve

(36)

(31)

(33) (37)

- 31 -



R210LC-9

Px : Attachment Auto Idle Switch Py : Travel Auto Idle Switch (41) : Bucket Limit Stroke

Py (41)

Px PG

- 32 -


4-4. Sensor Position-3

R210LC-9

Sensors Position

Pilot Control Swing, Boom Up, Arm In/O ut/Bucket In : 50k, 3EA

Auto Idle Signal Px , Py (The Lateral Face of MCV) : 50k, 2EA

Positiv e Control Pc1 & Pc2 : 100k, 2EA

Main Pump P1 & P2 : 500k, 2EA

Pilot Pump P3 : 50k, 1EA

- 33 -


4-5. Pressure Sensor Specification (Output Signal vs Pressure) (Electrical Signal from Pressure Switch to CPU)

50 bar Pressure Sensor ( P/NO : 31Q8-40520 )

● ●

V (Voltage)

●

bar ●


●

V (Voltage)

●

voltage bar ● ●


V (Voltage) ●

bar

- 34 -


4-6. Main Port-1

N2

Pc2

N1 Pc1 Ba

PIs Ao

Bo XB2

Dr1 As Atr

Bs Btr

- 35 -


4-7. Check Valve Position-1

LCa

LCo CCb

XB2 LCs

CP1

- 36 -


4-8. Main Port-2

Aa(Load)

R2 Ak

Bk

Ab

Bb Btl Py

Atl Py

Pz PX PG

PO PX PG

- 37 -


4-9. Check Valve Position-2

LCAP2 LCAT2 CRa LCk LCb CRb Py CMR2

C2 CMR1

Pz

PX PG

- 38 -


4-10. Pilot Port-1

PCV1

XBp1

BaR

XAa1

XAa2

BoR

XAo

Pck

BkR

Psp

XAb1

BbR

XAs

XBtl

XBtr

PTa

Xbk

DR2

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4-11. Pilot Port-2

Pss XBp2

PCV2 PH

XBa2 Pp

XBa1

Dr3 AR

Xak

XBo

AaR

AkR AbR

XBb1 XAtl

Pd AoR

XAb2

XBs

MR XAtr

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4-12. P1, P2, R1 Position P3,P4,P5 -> Plug d1,d2,d3 -> drain

P1

d1 d2 d3 P2

P3

R1

P4

CCk

CCo P5

- 41 -


4-13. Port Name

- 42 -


5. Boom up

R210LC-9

*Shuttle

*AM2 logic

BK IN

*Stroke limiter

BM2

BM1

Boom Up has priority over swing/arm/bucket operation - swing logic v/v - arm 2 logic v/v 주행직진

- bucket-in stroke limiter

P1

P2

R210LC-9

6. Boom Priority Function (Swing Logic Valve )

Swing logic valve is for boom priority when Boom up & Swing are operated simultaneously. The swing logic valve does not move in single swing operation.

Manual : Fixed boom priority function Auto : Pressure sensors sense the pilot pressure of boom up & swing. MCU sends the current to boom priority EPPR valve. Then, swing logic spool moves according to boom priority pilot pressure Boom1 spool Boom 2

Swing priority

Swing Logic

P1

- 44 -


R210LC-9

6-1. Electric Circuit for Boom Priority

BOOM MCU XAb2

XAb1

CN 53-9 Boom Priority EPPR + CN 53-19 Boom Priority EPPR CN 51-2 BATT’ POWER 24V CN 52-23 BOOM UP PRESSURE CN 51-5

PnS (MCV)

GND. PRESSURE

CN 52-24

XBs

XAs

SWING PRESSURE

SWING

▲

Psp

- 45 -

P3


6-2. Swing logic valve operation Boom2 Swing spool Swing priority To/From cylinder

Pns

Swing Swing logic

P1 bypass passage

Pns

P1 parallel passage

Pns

When boom priority pressure(Pns) is applied to swing logic valve, P1 parallel passage toward swing spool is restricted. So, boom up operation has priority over swing operation.

Pns

- 46 -

Pns


R210LC-9

7. Boom down operation

From cylinder

Check Valve is installed inside the spool for make up function (Boom Regeneration)

To cylinder

Cavitation is prevented by supplying the return oil from the check valve to supply line when the speed of boom down is faster than that by the oil supplied to large chamber of boom cylinder

Boom1

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R210LC-9

8. Arm in Operation

암1 암2

암2로직

암재생 해제sol

암재생cut

P3 P1

- 48 -

P2


9. Arm regeneration

R210LC-9

Arm speed control in the cluster On : Power of A4 solenoid will be off. So, Arm regeneration will be started when “pis” is given up. Off : A4 solenoid will be operated. So, Are regeneration will be given up when oil flow to “pis” Posi-Nega V/V

Dr1

Arm CYL. Small chamber

Arm CYL. Large chamber XBa1 XAa1 Arm Regeneration spool

- 49 -


R210LC-9

9-1. Arm regeneration operation

From cylinder To cylinder

Check valve

P2

Arm1 spool Arm1

Arm P2 regen cut

P1 bypass

Pis

Hole

Arm regen. cut spool

P1

P1 parallel

Pis

Arm regen.

Arm Regen. cut

Pis

- 50 -


R210LC-9

10. Swing Operation

암1 암2

암2로직

Swing motor RCV lever

P3 P1

- 51 -


R210LC-9

11. Swing Priority Valve Boom2

If you operate swing, pilot pressure will be supplied to “Psp”. Then, swing priority spool will be moved over and hydraulic oil is supplied to swing motor preferentially.

Swing priority Swing motor

Swing

Swing logic

P1 bypass passage

P1 parallel passage

Boom-up pilot pressure

Swing pilot pressure (Psp)

Boom2 spool

Swing priority valve

To Boom 1 spool (Boom confluence)

P1 parallel passage P1

- 52 -

(To Arm1/Option spool)


R210LC-9 X

12. Arm 2 Logic Valve When Boom up is operated, arm2 logic valve blocks the oil flow from P2 pump to the arm cylinder. Arm2

Combined operation of boom up and arm Arm2 logic

Boom up pilot Boom1

P2 parallel Boom up pilot

X

PnA2

P2

- 53 -


12-1. The Position of Arm 2 Logic Valve

PnA2

- 54 -

Dr7


12-2. ARM-2 Spool Pilot Port When an operator operates Arm in or Swing, it carry out positive control through “Pp”

Pss

XAa2

Arm out confluence Pilot

XBa2 Pp Pss

Arm in confluence Pilot To “Pc1”->pump regulator Swing pilot signal

Pss

XBa2 Pp

XBa2

Pp

- 55 -


R210LC-9

13. Bucket in operation

Bypass cut

암재생 해제sol

암재생cut

P1

P2

- 56 -


R210LC-9

13-1. Bucket-In confluence

To/From cylinder

P Bypass cut2

Tank

Bucket spool

off spool

BK-in pilot

BK-in pilot

P2 bypass P1 bypass

P2 parallel

P1 bypass

Tank

BK-in pilot

Bypass cut spool 1

P2

P1 bypass

BK-in pilot

Bucket conflux passage

- 57 -


R210LC-9

14. Bucket Stroke Limiter During the combined operation of boom-up and bucket-in, boom-up pilot pressure moves the bucket spool to half stroke, not full stroke.

Cylinder Stroke limiter

Bucket spool Bucket in pilot

Flow to bucket cylinder is reduced and P2 pump oil is supplied to boom cylinder preferentially.

Boom up pilot (Pck)

Boom up pilot

(Pck) Bucket-in pilot

Stroke limiter spool

- 58 -


14-1. The Position of Bucket Stroke Limiter

Xbk Xbk Pck

Pck

- 59 -


R210LC-9

15. Option Attachment 15-1. Breaker Mode At breaker mode, CPU allows the current to ATT’ Flow Control EPPR V/V to reduce the oil flow up to 7 Step.

Max 7 step, reduced 10 lpm each step

- 60 -


R210LC-9

15-2. Crusher Mode At crusher mode, CPU will send the current to ATT’ Flow Control EPPR V/V and reduces the delivered flow to maximum 4 step. 210 bar → 280 bar

Max 4 step, reduced 20 lpm each step

- 61 -


15-3. Hyd. circuit

Pi1

④

Bypass cut

① Option Att’ Safety sol. ② Option Att’ pressure sol. ③ Option Att’ conflux sol. ④ Option Att’ flow control v/v ⑤ 2-Stage option relief v/v

⑤

P1

①

③

②

P2

① ② ③

Option pedal

④

- 62 -


16. Straight Travel Function

- 63 -


R210LC-9

16-1. Straight Travel Valve(1)

선회우선

“SH” swing parking brake P1

P2

- 64 -

PG


R210LC-9

16-1. Straight Travel Valve(2)

선회우선

P1

P2

- 65 -

PG


16-3. The position of straight travel straight circuit valve & orifice.

Py PX PG d1 d2 d3

P3

P2

R1 4mm

- 66 -


R210LC-9

17. Pressure Sensor

선회우선

“SH” swing parking brake P1

P2

PG

When travel and work equipments are not operated with other requirements, auto ilde is activated

- 67 -


18. Holding Valve Holding Valve is applied both Boom down and Arm In

Pal : Arm holding release pilot port

Pbl :Boom holding release pilot port

CBa : Arm holding Check v/v

CBb : Boom holding Check v/v

Pal CRa

Pbl CRb

CRa CRb

Holding release pilot port

Check v/v Large chamber

From CYL. Chamber (Boom->Large ,Arm->Small)

Dr3(drain)

- 68 -


R210LC-9

18-1. Holding Condition

- 69 -


R210LC-9

18-2. Holding Release

- 70 -


Hyundai Dash 9 Posi - Nega sytem

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