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3-13
3
FUNCTION
PROPORTIONAL CONTROL SOLENOID VALVE
PROPORTIONAL CONTROL SOLENOID VALVE
3KAD01Z
1
2
4
S=A1-B1
S
Paxs
Paxs
Fk
Fs
Fks
B1 A1
A
P
T
Fs
Fks
Fk
3KAD02Z
A
P
T
1
5
3KAD03Z
A
P
T
1
6
This valve controls the secondary pressure by using the
built-in proportional pressure reducing valve.
The secondary pressure generated corresponds to the
changes in current, because the force used to generate the
secondary pressure is applied to the solenoid according to
the current passing through the coil.
When a current flows in the solenoid, a thrust force propor-
tional to the current is generated and it pushes the spool
(1) so that the oil supplied from the port P is directed to the
secondary pressure side port A to increase the pressure
Pa in the port A.
This pressure Pa works on the differential area S between
the cross sections A1 and B1 of the spool (1), and the spool
(1) is pushed to the solenoid side by the oil pressure Pa x S.
The spool (1) stops at the position where the sum of the oil
pressure Pa x S and the force Fk exerted by the springs (2)
is balanced with the thrust force Fs generated by the sole-
noid. The weight Fks of the spring (4) for fine adjustment of
the secondary pressure works in the direction (left) to assist
the thrust force from the solenoid.
When the thrust force becomes larger than the set value,
the spool (1) is moved to the left, connecting the port P
(supply side) and the port A (secondary side) through the
notch (5).
When the thrust force becomes smaller than the set value,
the spool (1) is moved to the right, connecting the port A
(secondary side) and the port T (tank side) through the
notch (6).
Therefore, the opening areas of the supply side notch (5)
and discharge side notch (6) are controlled by the move-
ment of the spool (1), and secondary (pilot) pressure cor-
responding to the thrust force generated by the solenoid
can be provided.
Содержание TB 250
Страница 1: ......
Страница 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Страница 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Страница 37: ...2 25 2 SERVICE DATA HYDRAULIC CIRCUIT DIAGRAM HYDRAULIC CIRCUIT DIAGRAM Equipped with options 1 2...
Страница 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Страница 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Страница 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Страница 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Страница 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Страница 43: ...2 31 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow angle blade blade oat option 1 2...
Страница 44: ...2 32 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow angle blade blade oat option 2 2...
Страница 46: ...2 34 2 ELECTRIC CIRCUIT DIAGRAM SERVICE DATA First auxiliary hydraulic piping with proportional control...
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Страница 92: ...3 11 3 CONTROL VALVE FUNCTION...
Страница 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Страница 130: ...4 25 4 UPPER FRAME DISASSEMBLY AND ASSEMBLY 15 Side frame R 16 Side frame L 17 Tool box 18 Cover 19 Bracket 20 Cover 2 2...
Страница 165: ...4 60 4 HYDRAULIC PUMP DISASSEMBLY AND ASSEMBLY f Remove the plug g Remove the spring and the ball...
Страница 267: ...4 162 4 SLEW MOTOR DISASSEMBLY AND ASSEMBLY Special tools Oil seal press tting jig A Collar installation jig B...
Страница 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...