CN109356894A - Land leveller front-wheel drive control valve and hydraulic system - Google Patents
Land leveller front-wheel drive control valve and hydraulic system Download PDFInfo
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- CN109356894A CN109356894A CN201811226267.7A CN201811226267A CN109356894A CN 109356894 A CN109356894 A CN 109356894A CN 201811226267 A CN201811226267 A CN 201811226267A CN 109356894 A CN109356894 A CN 109356894A
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- fluid port
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
- B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to land leveller front-wheel drives, influence straight line operation and steering behaviour to be easy unilateral skidding when solving the problems, such as existing land leveller front-wheel drive；A kind of land leveller front wheel driven hydraulic system is provided, including land leveller front-wheel drive control valve, variable pump is connect with the P hydraulic fluid port of land leveller front-wheel drive control valve by the road, the C1 hydraulic fluid port of land leveller front-wheel drive control valve, D1 hydraulic fluid port, C2 hydraulic fluid port, D2 hydraulic fluid port correspondence are connect with the actuator port of left and right front-wheel hydraulic motor, the oil inlet of the connection of the load feedback mouth of LS hydraulic fluid port and variable pump, T hydraulic fluid port and variable pump is connected with hydraulic tank by pipeline.In present hydraulic system, left and right front-wheel is individually controlled, and avoids unilateral slipping phenomenon, it can guarantee the straight line operation and steering behaviour of land leveller, different regime modes can be selected according to operation state of ground, neatly can effectively be played the effect of front-wheel power-assisted, be improved the operating efficiency and economy of complete machine.
Description
Technical field
The present invention relates to a kind of land leveller front-wheel drives, more specifically to a kind of land leveller front-wheel drive control valve
And hydraulic system.
Background technique
Existing land leveller front-wheel drive system is the front-wheel power-assisted open type hydraulic system of two motor of transfer tube band, driving
For pump from hydraulic oil container oil suction, outlet pressure oil is directly accessed two motors in parallel after control valve, then returns to through control valve hydraulic
A kind of open type hydraulic system of fuel tank.Into motor hydraulic fluid flow rate size by three position four-way directional control valve inside control valve valve
Core opening determines that the pressure of system is determined by the pressure shut-off valve of transfer tube.
When land leveller starts running work, the discharge capacity of transfer tube is under maximum pump discharge, the pressure oil band of transfer tube output
Dynamic motor rotation, under the action of loading outside, transfer tube generates pressure.When the driving force of motor is greater than traction, drive
Dynamic pump discharge pressure is less than pressure shut-off valve cut-out pressure, and pressure shut-off valve does not work, and transfer tube is in maximum pump discharge, motor
In maximum speed.When the driving force of motor is less than traction, driving pump discharge pressure reaches pressure shut-off valve cutting
Pressure, pressure cut off valve events, driving pumpage reduce, and since rear-wheel continues to press on land leveller traveling, drive pump discharge pressure
Power reduces, pressure cut off valve events, and driving pumpage increases.At this moment pressure shut-off valve ceaselessly acts, and maintains the row of transfer tube
Amount makes front-wheel match with rear wheel rotation speed.
Because the pressure oil of transfer tube output is directly accessed two motors in parallel after control valve, into the pressure oil of two motors
Flow freely distribute, when a side drive wheel and ground attachment condition are deteriorated, i.e. the ground reaction that is subject to of the side drive wheel
Power becomes smaller, then the flow that the side motor obtains pressure oil will increase, and the side motor rotary speed is caused to be accelerated, and other side motor rotary speed
It is slack-off or even do not turn, i.e. the unilateral slipping phenomenon of front-wheel, it cannot be guaranteed that the straight line working condition of land leveller, cannot guarantee that land leveller
Steering behaviour, influence the operating efficiency of land leveller and the safety of traveling.
Meanwhile motor under stall conditions when transfer tube be in the state of fuel feeding not in time, be easy to cause motor early stage grind
Damage, the service life for shortening motor.
Furthermore the pressure of transfer tube pressure shut-off valve be set up, but state of ground have local hollow, soil it is soft,
The conditions such as dry and wet are different and equipment load constantly variation, grader tire are also in continuous of short duration variation, pressure
Stop valve constantly acts, and the of short duration of front-wheel opposing rear wheels is caused to trackslip, and can not effectively play the effect of front-wheel power-assisted, and this
When trackslip and not only cause tire wear, can also cause complete machine sideslip or sidesway, there are great security risks.
Summary of the invention
The technical problem to be solved by the present invention is to for the unilateral skidding of motor existing for existing land leveller front-wheel drive system,
Motor premature wear and service life is short and land leveller working condition adaptability problem, and provide a kind of front-wheel drive it is synchronous,
The front-wheel drive control valve of differential, oil return regeneration function is turned to, and can be selected different operating conditions suitable according to operation state of ground
Mode is answered, the effect of front-wheel power-assisted neatly can be effectively played, improve the operating efficiency of complete machine and the land leveller front-wheel of economy
Drive control valve and hydraulic system.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of land leveller front-wheel drive control valve,
It is characterized in that including C1 hydraulic fluid port and D1 hydraulic fluid port for connecting with the near front wheel hydraulic motor, for connecting with off-front wheel hydraulic motor
C2 hydraulic fluid port and D2 hydraulic fluid port, the P hydraulic fluid port of oil inlet, oil return T hydraulic fluid port, for load signal feedback output LS hydraulic fluid port, for pair
The near front wheel reversal valve and off-front wheel reversal valve, shuttle valve, two-way difference of the near front wheel hydraulic motor and off-front wheel hydraulic motor should be controlled
Fast valve；The near front wheel reversal valve is mutually isostructural electric proportional reversing valve with off-front wheel reversal valve, with E hydraulic fluid port, F hydraulic fluid port, G oil
Mouth, V hydraulic fluid port, H hydraulic fluid port, be in middle position when, E hydraulic fluid port cut-off, F hydraulic fluid port simultaneously with G hydraulic fluid port, H hydraulic fluid port and V hydraulic fluid port mutual conduction；Place
When left position, E hydraulic fluid port is connected with G hydraulic fluid port and V hydraulic fluid port simultaneously, and H hydraulic fluid port simultaneously is connected with H hydraulic fluid port and regenerates unidirectionally through oil return for F hydraulic fluid port
Valve and E hydraulic fluid port one-way conduction；When in right position, E hydraulic fluid port is connected with H hydraulic fluid port and V hydraulic fluid port simultaneously, and F hydraulic fluid port and the conducting of G hydraulic fluid port are simultaneously
G hydraulic fluid port is through oil return regeneration check valve and E hydraulic fluid port one-way conduction；The G hydraulic fluid port of the near front wheel reversal valve, H hydraulic fluid port it is corresponding with C1 hydraulic fluid port and
D1 hydraulic fluid port communicates, and the G hydraulic fluid port of off-front wheel reversal valve, H hydraulic fluid port correspondence are communicated with C2 hydraulic fluid port and D2 hydraulic fluid port；The E of the near front wheel reversal valve
Hydraulic fluid port is communicated through left recuperation valve with P hydraulic fluid port, and the left end of left recuperation valve is communicated with the E hydraulic fluid port of the near front wheel reversal valve, left recuperation valve
The V hydraulic fluid port of right end and the near front wheel reversal valve is communicated while being communicated with the first oil inlet of shuttle valve；The E hydraulic fluid port of off-front wheel reversal valve passes through
Right recuperation valve is communicated with P hydraulic fluid port, and right recuperation valve left end is communicated with the E hydraulic fluid port of off-front wheel reversal valve, the right end of right recuperation valve and the right side
The V hydraulic fluid port of front-wheel reversal valve is communicated while being communicated with the second oil inlet of shuttle valve, and the oil outlet of shuttle valve is communicated with LS mouthfuls；It is left front
The F hydraulic fluid port of wheel reversal valve and off-front wheel reversal valve is communicated with T hydraulic fluid port；
Double direction differential valve is three-position four-way electromagnetic directional valve, with M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port and R hydraulic fluid port, when two-way
When differential valve is in middle position, M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port and R hydraulic fluid port are turned off, when Double direction differential valve is in left position, M hydraulic fluid port
End with Q hydraulic fluid port throttling conducting, O hydraulic fluid port and R hydraulic fluid port, when Double direction differential valve is in right position, O hydraulic fluid port and the throttling conducting of R hydraulic fluid port,
M hydraulic fluid port and the cut-off of Q hydraulic fluid port；The M hydraulic fluid port of Double direction differential valve is connected with C1 hydraulic fluid port, and O hydraulic fluid port is connected with D1 hydraulic fluid port, Q hydraulic fluid port and C2 oil
Mouth conducting, R hydraulic fluid port are connected with D2 hydraulic fluid port.
Further, in above-mentioned land leveller front-wheel drive control valve, at the near front wheel reversal valve and off-front wheel reversal valve
When left position or right position, oil return is provided on the oil duct that is connected in the near front wheel reversal valve and off-front wheel reversal valve with F hydraulic fluid port
Regenerate counterbalance valve.
It further, further include overflow valve in above-mentioned land leveller front-wheel drive control valve, the overflow valve is connected to P oil
Between mouth and T hydraulic fluid port.
Further, in above-mentioned land leveller front-wheel drive control valve, the V hydraulic fluid port of the near front wheel reversal valve and off-front wheel reversal valve
Damping hole is respectively provided on oil duct.
It further, further include Pi hydraulic fluid port, pressure reducing valve, pattern switching electromagnetism in above-mentioned land leveller front-wheel drive control valve
Valve, the oil inlet end of the pressure reducing valve and the P hydraulic fluid port of oil inlet connect, and oil outlet is connect with the oil inlet end of pattern switching solenoid valve, mould
The oil outlet of formula switching solenoid valve is connect with Pi hydraulic fluid port, and the oil revolving end of pattern switching solenoid valve is connect with T hydraulic fluid port, and the mode is cut
The oil outlet and oil inlet end or oil revolving end for changing solenoid valve select a conducting.
The present invention is to realize that the technical solution of its purpose is such that provide a kind of land leveller front wheel driven hydraulic system,
Including variable pump, the near front wheel hydraulic motor, off-front wheel hydraulic motor, hydraulic oil container, it is characterised in that further include aforementioned land leveller
Front-wheel drive control valve, the oil outlet of the variable pump are connect with the P hydraulic fluid port of land leveller front-wheel drive control valve by the road, level land
The C1 hydraulic fluid port of machine front-wheel drive control valve, D1 hydraulic fluid port correspondence are connect with two actuator ports of the near front wheel hydraulic motor, land leveller
The C2 hydraulic fluid port of front-wheel drive control valve, D2 hydraulic fluid port correspondence are connect with two actuator ports of off-front wheel hydraulic motor, before land leveller
The LS hydraulic fluid port of wheel drive control valve and the load feedback mouth of variable pump connect, the T hydraulic fluid port of land leveller front-wheel drive control valve and change
The oil inlet of amount pump is connected with hydraulic tank by pipeline respectively.
It further, further include controller, work connected to the controller in above-mentioned land leveller front wheel driven hydraulic system
Mode input mechanism, the land leveller front-wheel drive control valve further include Pi hydraulic fluid port, pressure reducing valve, pattern switching solenoid valve, described
The oil inlet end of pressure reducing valve and the P hydraulic fluid port of oil inlet connect, and oil outlet is connect with the oil inlet end of pattern switching solenoid valve, pattern switching electricity
The oil outlet of magnet valve is connect with Pi hydraulic fluid port, and the oil revolving end of pattern switching solenoid valve is connect with T hydraulic fluid port, the near front wheel reversal valve and
The Electromagnetic Control end of off-front wheel reversal valve and the Electromagnetic Control end of pattern switching solenoid valve connect with the output end of the controller
It connecing, there is the operating mode input unit a11wheel drive, front-wheel to creep three kinds of driving, front-wheel freewheel operating modes outputs,
The operating mode input unit is corresponding to creep three kinds of driving, front-wheel freewheel, a11wheel drive operating mode when institutes in front-wheel
State controller export corresponding control signal make the near front wheel reversal valve and off-front wheel reversal valve be corresponding in turn in left position, in
Position, left position or right position, when the operating mode input unit is in front-wheel freewheel operating mode, the pattern switching solenoid valve
Oil outlet and oil inlet end it is in the conductive state, the operating mode input unit, which is in front-wheel, creeps and drives operating mode and complete
When wheel drive operating mode, the oil outlet of the pattern switching solenoid valve is connected with oil revolving end.
It further, further include that regime mode selector valve and controller connect in above-mentioned land leveller front wheel driven hydraulic system
The operating condition input unit for selecting operating condition is connect, the automatically controlled end of the regime mode selector valve and the output end of the controller connect
It connects, the regime mode selector valve is connected between hydraulic oil container and the LS hydraulic fluid port of land leveller front-wheel drive control valve, the work
Condition input unit has the output for representing different regime modes, and controller described in corresponding different regime mode exports different electric currents
The regime mode selector valve is set to work in different pressure ratings.
It further, further include connecting with controller for detecting level land in above-mentioned land leveller front wheel driven hydraulic system
The rear wheel rotation speed sensor of machine rear wheel rotation speed and engine speed sensor for detecting engine speed, the controller root
According to the valve core opening of front-wheel reversal valve described in rear wheel rotation speed and control of engine speed to which the flow for controlling transfer tube output makes
Front wheel rotation speed is consistent with rear wheel rotation speed.
It further, further include for detecting land leveller front-wheel steer in above-mentioned land leveller front wheel driven hydraulic system
Sensing device is turned to, is creeped when driving operating mode in a11wheel drive or front-wheel, controller is according to the letter for turning to sensing device
Number judge whether front-wheel turns to, to control the working condition of the Double direction differential valve of front-wheel drive control valve, enables front-wheel steer
Enough realize turns to differential.
Compared with prior art, the present invention the invention has the advantages that
1. front wheel driven hydraulic system is because of the influence of surface condition and payload size, driving is synchronized when straight trip or so, no
Unilateral slipping phenomenon caused by due to the traction of left and right front-wheel difference；
2. when front-wheel steer, left and right front-wheel has differential function, guarantee output front-wheel power-assisted effect while steering behaviour；
3. when current wheel motor stall, the oil return of motor can directly be drawn by the oil return regeneration function of front-wheel reversal valve
Enter the oil inlet of motor, guarantees that motor fuel feeding is timely, extend the service life of motor；
4. front-wheel drive system can select different regime modes according to operation state of ground, neatly can effectively play
The effect of front-wheel power-assisted, improves the operating efficiency and economy of complete machine.
Detailed description of the invention
Fig. 1 is land leveller front wheel driven hydraulic systematic schematic diagram of the invention.
Fig. 2 is land leveller front-wheel drive control valve schematic diagram of the invention.
Fig. 3 is the front-wheel reversal valve schematic diagram of land leveller front-wheel drive control valve of the invention.
Fig. 4 is the electrical control block diagram of land leveller front wheel driven hydraulic system of the invention.
Specific embodiment
Illustrate specific embodiment with reference to the accompanying drawing.
As Figure 1 and Figure 4, the land leveller front wheel driven hydraulic system in the present embodiment includes hydraulic oil container 1, transfer tube
2, regime mode selector valve 3, land leveller front-wheel drive control valve 4, the near front wheel hydraulic motor 5, off-front wheel hydraulic motor 6, control
Device 7, operating mode input unit 9, turns to sensing device 10, engine speed sensor 11, operating condition at rear wheel rotation speed sensor 8
Mode input mechanism 12.
As shown in Figure 2 and Figure 3, land leveller front-wheel drive control valve 4 includes the near front wheel reversal valve 401, off-front wheel reversal valve
402, left recuperation valve 403, right recuperation valve 404, main safety valve 405, pressure reducing valve 406, pattern switching solenoid valve 407, shuttle valve 408,
Double direction differential valve 409, oil return regeneration check valve 410, oil return regenerate counterbalance valve 411.The near front wheel reversal valve 401 and off-front wheel commutation
Valve 402 is the proportion magnetic valve that there is drive electromagnet at both ends, and 401 left end of the near front wheel reversal valve has the near front wheel advance electromagnet
There is the near front wheel to retreat electromagnet Y2 for Y1, right end, and 402 left end of off-front wheel reversal valve has off-front wheel advance electromagnet Y3, right end
Electromagnet Y4 is retreated with off-front wheel.The near front wheel reversal valve 401 has E1 hydraulic fluid port, F1 hydraulic fluid port, G1 hydraulic fluid port, V1 hydraulic fluid port, H1 oil
Mouthful；When in middle position, E1 hydraulic fluid port ends, F1 hydraulic fluid port and G1 hydraulic fluid port, H1 hydraulic fluid port and V1 hydraulic fluid port mutual conduction；When in left position, E1
Hydraulic fluid port is connected with G1 hydraulic fluid port and V1 hydraulic fluid port simultaneously, and F1 hydraulic fluid port is connected with H1 hydraulic fluid port, meanwhile, H1 hydraulic fluid port regenerates check valve through oil return
410 with E1 hydraulic fluid port one-way conduction；E1 hydraulic fluid port is connected with H1 hydraulic fluid port and V1 hydraulic fluid port simultaneously when in right position, F1 hydraulic fluid port and G1 hydraulic fluid port
Conducting, meanwhile, G1 hydraulic fluid port is through oil return regeneration check valve 410 and E1 hydraulic fluid port one-way conduction；Off-front wheel reversal valve 402 and left front rotation
It is identical to 401 structure function of valve, with E2 hydraulic fluid port, F2 hydraulic fluid port, G2 hydraulic fluid port, V2 hydraulic fluid port, H2 hydraulic fluid port, when being in middle position, E2 oil
Mouth cut-off, F2 hydraulic fluid port and G2 hydraulic fluid port, H2 hydraulic fluid port and V2 hydraulic fluid port mutual conduction；When in left position, E2 hydraulic fluid port simultaneously with G2 hydraulic fluid port and
The conducting of V2 hydraulic fluid port, F2 hydraulic fluid port are connected with H2 hydraulic fluid port, meanwhile, H2 hydraulic fluid port is through oil return regeneration check valve 410 and E2 hydraulic fluid port one-way conduction；
When in right position, E2 hydraulic fluid port is connected with H2 hydraulic fluid port and V2 hydraulic fluid port simultaneously, F2 hydraulic fluid port and the conducting of G2 hydraulic fluid port, meanwhile, G2 hydraulic fluid port passes through back
Oil regeneration check valve 410 and E2 hydraulic fluid port one-way conduction.The T hydraulic fluid port of oil return includes T3 hydraulic fluid port, T4 hydraulic fluid port, T5 hydraulic fluid port.Left front rotation
To valve 401 V1 hydraulic fluid port and off-front wheel reversal valve 402 V2 hydraulic fluid port oil duct on be respectively provided with damping hole.When the near front wheel reversal valve 401
When in left position or right position, oil return regeneration counterbalance valve 411 is provided on the oil duct of F1 hydraulic fluid port；When off-front wheel reversal valve 402 is in
When left position or right position, oil return regeneration counterbalance valve 411 is provided on the oil duct of F2 hydraulic fluid port.
The G1 hydraulic fluid port of the near front wheel reversal valve, H1 hydraulic fluid port correspondence are communicated with C1 hydraulic fluid port, D1 hydraulic fluid port, the G2 oil of off-front wheel reversal valve
Mouth, H2 hydraulic fluid port correspondence are communicated with C2 hydraulic fluid port, D2 hydraulic fluid port；The E1 hydraulic fluid port of the near front wheel reversal valve 401 is through left recuperation valve 403 and P hydraulic fluid port
It communicating, the left end of left recuperation valve 403 is communicated with the E1 hydraulic fluid port of the near front wheel reversal valve 401, the right end of left recuperation valve 403 (namely bullet
Spring end) it is communicated simultaneously with the S hydraulic fluid port (namely first oil inlet) of the V1 hydraulic fluid port of the near front wheel reversal valve 401 and shuttle valve 408；Off-front wheel
The E2 hydraulic fluid port of reversal valve 402 is communicated through right recuperation valve 404 with P hydraulic fluid port, the left end of right recuperation valve 404 and off-front wheel reversal valve 402
E2 hydraulic fluid port communicate, the right end (namely spring terminal) of the right recuperation valve 405 V2 hydraulic fluid port and shuttle with off-front wheel reversal valve 402 simultaneously
The X hydraulic fluid port (namely second oil inlet) of valve 408 communicates, the F2 hydraulic fluid port of the F1 hydraulic fluid port of the near front wheel reversal valve and off-front wheel reversal valve with
The conducting of T3 hydraulic fluid port, the Y hydraulic fluid port of shuttle valve 408 are communicated with LS hydraulic fluid port.
Pattern switching solenoid valve 407 is the two-bit triplet solenoid valve that upper end has electromagnet Y7, pattern switching solenoid valve 407
The L hydraulic fluid port of K hydraulic fluid port, oil outlet with oil inlet end and the N hydraulic fluid port of oil revolving end, when 407 power loss of pattern switching solenoid valve is in down
Position when, K hydraulic fluid port and L hydraulic fluid port conducting, when pattern switching solenoid valve 407 it is electric in it is upper when, L hydraulic fluid port and N hydraulic fluid port conducting, mode
The K hydraulic fluid port of switching solenoid valve 407 is connected through pressure reducing valve 406 with P hydraulic fluid port, and L hydraulic fluid port is connected with Pi hydraulic fluid port, N hydraulic fluid port and T4 hydraulic fluid port phase
It is logical.
Double direction differential valve 409 is the three position four-way electromagnetic valve that both ends all have electromagnet, and 409 left end of Double direction differential valve has
Advance differential electromagnet Y5, right end, which has, retreats differential electromagnet Y6；Double direction differential valve 409 has M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port
With R hydraulic fluid port, when Double direction differential valve is in middle position, M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port and R hydraulic fluid port are turned off, at Double direction differential valve
When left position, M hydraulic fluid port and Q hydraulic fluid port throttling conducting, O hydraulic fluid port and R hydraulic fluid port end, when Double direction differential valve is in right position, O hydraulic fluid port
It throttles and is connected with R hydraulic fluid port, M hydraulic fluid port and the cut-off of Q hydraulic fluid port；The M hydraulic fluid port of Double direction differential valve is connected with C1 hydraulic fluid port, O hydraulic fluid port and D1 hydraulic fluid port
Conducting, Q hydraulic fluid port are connected with C2 hydraulic fluid port, and R hydraulic fluid port is connected with D2 hydraulic fluid port.
Transfer tube 2 is load sensing variable pump, and regime mode selector valve 3 is electric proportional pressure control valve, the near front wheel hydraulic motor 5
It is radial plunger type motor with off-front wheel hydraulic motor 6.Regime mode selector valve 3 is connected to hydraulic oil container and land leveller front-wheel
Between the LS hydraulic fluid port of drive control valve.
As shown in Figure 1, transfer tube 2 connects from 1 oil suction of fuel tank, oil outlet P0 and the P hydraulic fluid port of land leveller front-wheel drive control valve 4
It connects, corresponding A1 hydraulic fluid port, the B1 hydraulic fluid port with the near front wheel hydraulic motor 5 of C1 hydraulic fluid port, the D1 hydraulic fluid port of land leveller front-wheel drive control valve 4 connects
It connects, corresponding A2 hydraulic fluid port, the B2 hydraulic fluid port with off-front wheel hydraulic motor 6 of C2 hydraulic fluid port, D2 hydraulic fluid port of land leveller front-wheel drive control valve 4
Connection, T3 hydraulic fluid port, T4 hydraulic fluid port and the T5 hydraulic fluid port of land leveller front-wheel drive control valve 4 are connect with fuel tank 1, land leveller front-wheel drive control
The LS hydraulic fluid port of valve 4 processed is connect with the LS1 hydraulic fluid port of transfer tube 2, and the Pi hydraulic fluid port and the near front wheel of land leveller front-wheel drive control valve 4 are hydraulic
The T1 hydraulic fluid port of motor 5 is connected with the T2 hydraulic fluid port of off-front wheel hydraulic motor 6, oil inlet and the transfer tube 2 of regime mode selector valve 3
LS1 hydraulic fluid port is in parallel, and oil outlet is connect with fuel tank 1.
As shown in figure 4, rear wheel rotation speed sensor 8, operating mode input unit 9, steering sensing device 10, engine speed
Sensor 11 and regime mode input unit 12 are connect with controller 7, and the near front wheel advance electromagnet Y1, the near front wheel retreat electromagnet
Y2, off-front wheel advance electromagnet Y3, off-front wheel retreat electromagnet Y4, advance differential electromagnet Y5, retreat differential electromagnet Y6,
Control terminal correspondence and the controller 7 of the electromagnet Y8 of the electromagnet Y7 and regime mode selector valve 3 of pattern switching solenoid valve
Control output end connection.Rear wheel rotation speed sensor 8 can directly measure the revolving speed of land leveller rear-wheel, can also be by detecting gearbox
The revolving speed of upper certain grade of shaft and the revolving speed for measuring rear-wheel indirectly；Operating mode input unit 9 can be dial position switch, such as this group
There is bit switch front-wheel freewheel, front-wheel to creep driving, a11wheel drive mode, and operating mode input unit 9 is in different shapes
State dial position, it is the next or upper that controller output current potential is located at pattern switching solenoid valve 407, to realize that front-wheel is in freewheel
State or driving condition；It turns to before sensing device 10 is mounted on bridge or on front wheel knuckle or on transfer, at front-wheel
The turn signal of front-wheel is output to controller 7 when steering state；Engine speed sensor 11 detects the revolving speed of engine,
Engine speed data is output to controller 7 in real time；Regime mode input unit 12 can be dial position switch, such as the dial position
There is switch field mode, sand ground mode and snow field mode etc. various working mode, operating condition is arranged according to the situation on operation ground
Mode input mechanism 12 is in different mode dial position, and controller 7 exports different current values to the electricity of regime mode selector valve 3
Magnetic coil makes regime mode selector valve 3 be in different pressure ratings, to adjust the output torque of front-wheel hydraulic motor.
In the present embodiment, when land leveller does not use front-wheel drive namely operating mode input unit 9 is in front-wheel
When freewheel mode, pattern switching solenoid valve electromagnet Y7 power loss is in bottom, and K hydraulic fluid port is connected with L hydraulic fluid port, meanwhile, the near front wheel
Reversal valve 401, off-front wheel reversal valve 402 electromagnet power loss be in middle position, the E1 hydraulic fluid port cut-off of the near front wheel reversal valve 401, F1
Hydraulic fluid port is connected with G1 hydraulic fluid port, H1 hydraulic fluid port and V1 hydraulic fluid port, the E2 hydraulic fluid port cut-off of off-front wheel reversal valve 402, F2 hydraulic fluid port and G2 hydraulic fluid port, H2
Hydraulic fluid port and the conducting of V2 hydraulic fluid port, at this point, the oil inlet and outlet A hydraulic fluid port and B hydraulic fluid port of the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6
It is connected simultaneously with fuel tank, control oil is entered the T1 hydraulic fluid port of the near front wheel hydraulic motor 5 and the T2 of off-front wheel hydraulic motor 6 by Pi hydraulic fluid port
Motor piston is pushed back plunger cavity by hydraulic fluid port, realizes that the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6 are in freewheel state.
When front-wheel drive is used only in land leveller namely when operating mode input unit 9 is in front-wheel creep mode, put down
The rear axle of ground machine is provided without driving force, the driving force of complete machine by front-wheel.At this point, the near front wheel advance electromagnet Y1, off-front wheel advance
Electromagnet Y3, pattern switching solenoid valve electromagnet Y7 obtain it is electric, i.e., the near front wheel reversal valve 401, off-front wheel reversal valve 402 be in a left side
Position, the near front wheel reversal valve E1 hydraulic fluid port are connected with G1 hydraulic fluid port, V1 hydraulic fluid port, and F1 hydraulic fluid port is connected with H1 hydraulic fluid port, off-front wheel reversal valve E2 oil
Mouth is connected with G2 hydraulic fluid port, V2 hydraulic fluid port, and F2 hydraulic fluid port is connected with H2 hydraulic fluid port, and the L hydraulic fluid port of pattern switching solenoid valve is connected with N hydraulic fluid port, this
When, before the oil liquid that transfer tube 2 exports enters A1 hydraulic fluid port and the right side of the near front wheel hydraulic motor 5 through land leveller front-wheel drive control valve 4
The A2 hydraulic fluid port of hydraulic motor 6 is taken turns, the B1 hydraulic fluid port of the near front wheel hydraulic motor 5 and the B2 hydraulic fluid port of off-front wheel hydraulic motor 6 are through land leveller
The T3 hydraulic fluid port of front-wheel drive control valve 4 returns to fuel tank 1, the T1 hydraulic fluid port of the near front wheel hydraulic motor 5 and the T2 of off-front wheel hydraulic motor 6
Hydraulic fluid port returns to fuel tank 1 through pattern switching solenoid valve 407；At this point, if the traction of the near front wheel hydraulic motor 5 is greater than off-front wheel
The pressure of the V1 hydraulic fluid port of the traction namely the near front wheel reversal valve 401 of hydraulic motor 6 is greater than off-front wheel reversal valve 402
When V2 hydraulic fluid port pressure, the pressure of the LS hydraulic fluid port of land leveller front-wheel drive control valve 4 is the pressure of V1, otherwise is the pressure of V2；This
When, the speed of land leveller is controlled by the revolving speed of engine, i.e. the tachometer value that receives engine speed sensor 11 of controller 7,
By the near front wheel reversal valve 401 from calculating to land leveller front-wheel drive control valve 4 advance electromagnet Y1 and off-front wheel reversal valve
The current value of 402 advance electromagnet Y3 output corresponding speed, transfer tube 2 according to the spool aperture of the near front wheel reversal valve 401 and
The spool aperture of off-front wheel reversal valve 402 exports corresponding flow, and driving front-wheel advances.
When land leveller is advanced using a11wheel drive namely when operating mode input unit 9 is in a11wheel drive mode,
The near front wheel advance electromagnet Y1, off-front wheel advance electromagnet Y3, pattern switching solenoid valve electromagnet Y7 obtain electric, i.e. the near front wheel commutation
Valve 401, off-front wheel reversal valve 402 are in left position, and the near front wheel reversal valve E1 hydraulic fluid port is connected with G1 hydraulic fluid port, V1 hydraulic fluid port, F1 hydraulic fluid port with
The conducting of H1 hydraulic fluid port, off-front wheel reversal valve E2 hydraulic fluid port are connected with G2 hydraulic fluid port, V2 hydraulic fluid port, and F2 hydraulic fluid port is connected with H2 hydraulic fluid port, pattern switching
The L hydraulic fluid port of solenoid valve is connected with N hydraulic fluid port, at this point, the oil liquid that transfer tube 2 exports enters a left side through land leveller front-wheel drive control valve 4
The A1 hydraulic fluid port of front-wheel hydraulic motor 5 and the A2 hydraulic fluid port of off-front wheel hydraulic motor 6, the B1 hydraulic fluid port of the near front wheel hydraulic motor 5 and it is right before
The B2 hydraulic fluid port of wheel hydraulic motor 6 returns to fuel tank 1 through the T3 hydraulic fluid port of land leveller front-wheel drive control valve 4, the near front wheel hydraulic motor 5
The T2 hydraulic fluid port of T1 hydraulic fluid port and off-front wheel hydraulic motor 6 returns to fuel tank 1 through pattern switching solenoid valve 407；At this point, if the near front wheel is hydraulic
The traction of motor 5 is greater than the traction of off-front wheel hydraulic motor 6 namely the V1 hydraulic fluid port of the near front wheel reversal valve 401
Pressure be greater than off-front wheel reversal valve 402 V2 hydraulic fluid port pressure when, the pressure of the LS hydraulic fluid port of land leveller front-wheel drive control valve 4 is
The pressure of V1, on the contrary it is the pressure of V2；At this point, controller 7 receives rear wheel rotation speed sensor 8 and engine speed sensor 11
Tachometer value, by the near front wheel reversal valve 401 from calculating to land leveller front-wheel drive control valve 4 advance electromagnet Y1 and it is right before
The current value of the advance electromagnet Y3 output corresponding speed of reversal valve 402 is taken turns, transfer tube 2 is according to the valve of the near front wheel reversal valve 401
Core aperture and the spool aperture of off-front wheel reversal valve 402 export corresponding flow, keep preceding wheel speed consistent with rear wheel speed；When flat
Ground locomotive speed changes, i.e., when rear wheel rotation speed sensor 8 and the collected numerical value of engine speed sensor 11 change,
Controller 7 recalculates rear wheel speed, and electric to the advance of the near front wheel reversal valve 401 of land leveller front-wheel drive control valve 4
The advance electromagnet Y3 output of magnet Y1, off-front wheel reversal valve 402 match the current value of corresponding speed, adjust the near front wheel reversal valve
401, the spool aperture of off-front wheel reversal valve 402 makes transfer tube 2 export the flow of corresponding speed to the near front wheel hydraulic motor 5, the right side
Front-wheel hydraulic motor 6 keeps the near front wheel hydraulic motor 5, the speed of off-front wheel hydraulic motor 6 and rear wheel speed always consistent.
When land leveller uses front-wheel power-assisted steering, i.e., when land leveller is turned to using a11wheel drive mode or creep mode,
The steering state of the detection land leveller of sensing device 10 is turned to 7 output signal of controller, controller 7 controls land leveller front-wheel drive
The advance differential electromagnet Y5 of the Double direction differential valve 409 of control valve 4, retreat differential electromagnet Y6 electric power failure state so that
The throttling conducting of the actuator port of the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6, realizes and turns to differential；I.e. before land leveller
Into when, the advance differential electromagnet Y5 of Double direction differential valve 409 obtains electric, makes the C1 hydraulic fluid port and C2 of land leveller front-wheel drive control valve 4
Hydraulic fluid port throttling conducting, even if the also A2 hydraulic fluid port of the A1 hydraulic fluid port of the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor throttling conducting, makes
Left and right front-wheel hydraulic motor, which is realized, turns to differential function；When land leveller retreats, the retrogressing differential electromagnet of Double direction differential valve 409
Y6 obtain it is electric, make land leveller front-wheel drive control valve 4 D1 hydraulic fluid port and D2 hydraulic fluid port throttling conducting, even if also the near front wheel hydraulic motor 5
B1 hydraulic fluid port and off-front wheel hydraulic motor 6 B2 hydraulic fluid port throttle conducting, make left and right front-wheel hydraulic motor realize turn to differential function,
Guarantee the power-assisted effect of front-wheel simultaneously.
In the present embodiment, there is the near front wheel hydraulic motor 5 and off-front wheel liquid when land leveller is using front-wheel power-assisted operation
When pressure motor 6 is in fuel feeding too late stall conditions, i.e., before the actual vehicle speed of land leveller is more than the near front wheel hydraulic motor 5 and is right
The revolving speed for taking turns hydraulic motor 6, at this point, the near front wheel reversal valve 401 of land leveller control valve 4 and off-front wheel electricity ratio change 402
Oil return regeneration function the oil return opening of the near front wheel hydraulic motor 5 is connected with oil inlet, the oil return opening of off-front wheel hydraulic motor 6 with
Oil inlet conducting changes 402 oil return regeneration function in time to the left by the near front wheel reversal valve 401 and off-front wheel electricity ratio
The oil inlet of front-wheel hydraulic motor 5 and off-front wheel hydraulic motor 6 supplements oil liquid, is effectively protected the near front wheel hydraulic motor 5 and the right side
Front-wheel hydraulic motor 6 extends the service life of the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6.
In the present embodiment, various working mode can be set according to the situation on level land machine operation ground, adjusts the near front wheel liquid
The output torque of pressure motor 5 and off-front wheel hydraulic motor 6.When traction is larger, regime mode input unit 12 is dialled
Bit switch selects field mode, and controller 7 exports low current value to the electromagnet Y8 of regime mode selector valve 3 or do not export electricity
Stream, makes regime mode selector valve 3 be in big pressure rating, at this point, the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6 export
Torque it is maximum, so that front-wheel hydraulic motor is played its whole power-assisted ability；When traction is general, regime mode is defeated
Enter the dial position switch selection sand ground mode of device 12, controller 7 exports medium current to the electromagnet Y8 of regime mode selector valve 3
Value, makes regime mode selector valve 3 be in middle pressure grade, at this point, the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6 are defeated
Torque out is medium, the near front wheel hydraulic motor 5 and off-front wheel hydraulic motor 6 can be made to play its power-assisted ability, and beat front-wheel
It is sliding；When traction is smaller, the dial position of regime mode input unit 12 switch selection snow field mode, controller 7 is to operating condition
The electromagnet Y8 of model selection valve 3 exports high current value, so that regime mode selector valve 3 is in low-pressure grade, at this point, the near front wheel
The torque that hydraulic motor 5 and off-front wheel hydraulic motor 6 export is smaller, front-wheel hydraulic motor can be made to play its power-assisted ability, and not
Front-wheel is set to skid.According to the regime mode that operation state of ground flexible choice is different when the machine operation of level land, can effectively play
The effect of front-wheel power-assisted, and the operating efficiency and fuel economy of complete machine can be improved.
It is an advantage of the invention that driving asynchronous, left and right front-wheel because of ground when solving the straight trip of front wheel driven hydraulic system or so
Face adhesive force it is different and caused by unilateral slipping phenomenon, remain that motor driving in left and right synchronizes, and the speed of front-wheel always with
With the speed of rear-wheel；Moreover, left and right front-wheel has differential function when front-wheel steer, makes to turn to nearside wheel and turn to outside wheel speed
That spends is inconsistent, guarantees output front-wheel power-assisted effect while steering behaviour；Meanwhile when current wheel motor stall, before can passing through
The oil return of motor, is introduced directly into the oil inlet of motor by the oil return regeneration function for taking turns electric proportional reversing valve, guarantees that motor fuel feeding is timely,
Extend the service life of motor；Furthermore front-wheel drive system can select different operating condition adaptive patterns according to operation state of ground,
The effect of front-wheel power-assisted neatly can be effectively played, the operating efficiency and economy of complete machine are improved.
Claims (10)
1. a kind of land leveller front-wheel drive control valve, it is characterised in that including the C1 hydraulic fluid port for being connect with the near front wheel hydraulic motor
The P hydraulic fluid port of C2 hydraulic fluid port and D2 hydraulic fluid port, oil inlet with D1 hydraulic fluid port, for being connect with off-front wheel hydraulic motor, the T hydraulic fluid port of oil return, use
In the LS hydraulic fluid port of load signal feedback output, for the near front wheel of corresponding control the near front wheel hydraulic motor and off-front wheel hydraulic motor
Reversal valve and off-front wheel reversal valve, shuttle valve, Double direction differential valve；The near front wheel reversal valve is mutually isostructural electricity with off-front wheel reversal valve
Proportional reversing valve, with E hydraulic fluid port, F hydraulic fluid port, G hydraulic fluid port, V hydraulic fluid port, H hydraulic fluid port, when being in middle position, the cut-off of E hydraulic fluid port, F hydraulic fluid port is simultaneously
With G hydraulic fluid port, H hydraulic fluid port and V hydraulic fluid port mutual conduction；When in left position, E hydraulic fluid port is connected with G hydraulic fluid port and V hydraulic fluid port simultaneously, F hydraulic fluid port and H
Hydraulic fluid port is connected while H hydraulic fluid port is through oil return regeneration check valve (410) and E hydraulic fluid port one-way conduction；When in right position, E hydraulic fluid port while and H
Hydraulic fluid port and the conducting of V hydraulic fluid port, F hydraulic fluid port and G hydraulic fluid port are connected while G hydraulic fluid port is through oil return regeneration check valve and E hydraulic fluid port one-way conduction；It is left front
Take turns the G hydraulic fluid port of reversal valve, H hydraulic fluid port correspondence is communicated with C1 hydraulic fluid port and D1 hydraulic fluid port, the G hydraulic fluid port of off-front wheel reversal valve, H hydraulic fluid port it is corresponding with
C2 hydraulic fluid port and D2 hydraulic fluid port communicate；The E hydraulic fluid port of the near front wheel reversal valve is communicated through left recuperation valve with P hydraulic fluid port, the left end of left recuperation valve with
The E hydraulic fluid port of the near front wheel reversal valve communicates, the right end of left recuperation valve communicated with the V hydraulic fluid port of the near front wheel reversal valve simultaneously with shuttle valve
One oil inlet communicates；The E hydraulic fluid port of off-front wheel reversal valve is communicated through right recuperation valve with P hydraulic fluid port, and right recuperation valve left end is changed with off-front wheel
It is communicated to the E hydraulic fluid port of valve, the right end of right recuperation valve communicates the second oil inlet with shuttle valve simultaneously with the V hydraulic fluid port of off-front wheel reversal valve
It communicates, the oil outlet of shuttle valve is communicated with LS mouthfuls；The F hydraulic fluid port of the near front wheel reversal valve and off-front wheel reversal valve is connect with T hydraulic fluid port；
Double direction differential valve works as Double direction differential with M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port and R hydraulic fluid port for three-position four-way electromagnetic directional valve
When valve is in middle position, M hydraulic fluid port, O hydraulic fluid port, Q hydraulic fluid port and R hydraulic fluid port are turned off, when Double direction differential valve is in left position, M hydraulic fluid port and Q oil
Mouth throttling conducting, O hydraulic fluid port and the cut-off of R hydraulic fluid port, when Double direction differential valve is in right position, O hydraulic fluid port and the throttling of R hydraulic fluid port are connected, M hydraulic fluid port
End with Q hydraulic fluid port；The M hydraulic fluid port of Double direction differential valve is communicated with C1 hydraulic fluid port, and O hydraulic fluid port is communicated with D1 hydraulic fluid port, Q hydraulic fluid port and C2 hydraulic fluid port phase
Logical, R hydraulic fluid port is communicated with D2 hydraulic fluid port.
2. land leveller front-wheel drive control valve according to claim 1, it is characterised in that the near front wheel reversal valve and the right side
When front-wheel reversal valve is in left position or right position, the oil duct that is connected in the near front wheel reversal valve and off-front wheel reversal valve with F hydraulic fluid port
On be provided with oil return regeneration counterbalance valve (411).
3. land leveller front-wheel drive control valve according to claim 1, it is characterised in that the near front wheel reversal valve and off-front wheel
Damping hole is respectively provided on the V hydraulic fluid port oil duct of reversal valve.
4. land leveller front-wheel drive control valve according to claim 1, it is characterised in that it further include overflow valve, the overflow
Valve is connected between P hydraulic fluid port and T hydraulic fluid port.
5. land leveller front-wheel drive control valve according to any one of claim 1 to 4, it is characterised in that further include Pi oil
Mouth, pressure reducing valve, pattern switching solenoid valve, the oil inlet end of the pressure reducing valve and the P hydraulic fluid port of oil inlet connect, oil outlet and pattern switching
The oil inlet end of solenoid valve connects, and the oil outlet of pattern switching solenoid valve is connect with Pi hydraulic fluid port, the oil revolving end of pattern switching solenoid valve
It is connect with T hydraulic fluid port, the oil outlet and oil inlet end or oil revolving end of the pattern switching solenoid valve select a conducting.
6. a kind of land leveller front wheel driven hydraulic system, including variable pump, the near front wheel hydraulic motor, off-front wheel hydraulic motor, liquid
Pressure oil case, it is characterised in that further include land leveller front-wheel drive control valve described in any one of Claims 1-4, the change
The oil outlet of amount pump is connect with the P hydraulic fluid port of land leveller front-wheel drive control valve by the road, the C1 of land leveller front-wheel drive control valve
Hydraulic fluid port, D1 hydraulic fluid port correspondence are connect with two actuator ports of the near front wheel hydraulic motor, the C2 oil of land leveller front-wheel drive control valve
Mouth, D2 hydraulic fluid port correspondence are connect with two actuator ports of off-front wheel hydraulic motor, the LS hydraulic fluid port of land leveller front-wheel drive control valve
It is connect with the load feedback mouth of variable pump, the T hydraulic fluid port of land leveller front-wheel drive control valve and the oil inlet of variable pump pass through respectively
Pipeline is connected with hydraulic tank.
7. land leveller front wheel driven hydraulic system according to claim 6, it is characterised in that further include controller and control
The operating mode input unit of device connection；The land leveller front-wheel drive control valve further includes Pi hydraulic fluid port, pressure reducing valve, pattern switching
Solenoid valve, the oil inlet end of the pressure reducing valve and the P hydraulic fluid port of oil inlet connect, and the oil inlet end of oil outlet and pattern switching solenoid valve connects
It connects, the oil outlet of pattern switching solenoid valve is connect with Pi hydraulic fluid port, and the oil revolving end of pattern switching solenoid valve is connect with T hydraulic fluid port, described
The Electromagnetic Control end at the Electromagnetic Control end and pattern switching solenoid valve of the near front wheel reversal valve and off-front wheel reversal valve with the control
The output end of device processed connects, and there is the operating mode input unit a11wheel drive, front-wheel to creep three kinds of driving, front-wheel freewheel
Operating mode output, the operating mode input unit is corresponding to creep driving, front-wheel freewheel, three kinds of a11wheel drive in front-wheel
The controller, which exports corresponding control signal, when operating mode keeps the near front wheel reversal valve and off-front wheel reversal valve successively right
It should be at left position, middle position, left position or right position；It is described when the operating mode input unit is in front-wheel freewheel operating mode
The oil outlet of pattern switching solenoid valve and oil inlet end are in the conductive state, and the operating mode input unit is in front-wheel and creeps drive
Start building operation mode or a11wheel drive operating mode when, the oil outlet of the pattern switching solenoid valve is connected with oil revolving end.
8. land leveller front wheel driven hydraulic system according to claim 7, it is characterised in that further include regime mode selection
Valve connect operating condition input unit for selecting operating condition, the automatically controlled end of the regime mode selector valve and the control with controller
The output end of device processed connects, and the regime mode selector valve is connected to the LS oil of hydraulic oil container and land leveller front-wheel drive control valve
Between mouthful, the operating condition input unit has the output for representing different regime modes, controls described in corresponding different regime mode
Device, which exports different electric currents, makes the regime mode selector valve work in different pressure ratings.
9. land leveller front wheel driven hydraulic system according to claim 7, it is characterised in that further include being connect with controller
Engine speed sensor for detecting the rear wheel rotation speed sensor of land leveller rear wheel rotation speed and for detecting engine speed,
The valve core opening of controller front-wheel control valve according to rear wheel rotation speed and control of engine speed is to control transfer tube
The flow of output keeps front wheel rotation speed consistent with rear wheel rotation speed.
10. land leveller front wheel driven hydraulic system according to claim 7, it is characterised in that further include for detecting level land
The steering sensing device of machine front-wheel steer is creeped in a11wheel drive or front-wheel when driving operating mode, and controller is according to steering
The signal of sensing device judges whether front-wheel turns to, to control the working condition of the Double direction differential valve of front-wheel drive control valve,
Front-wheel steer is set to can be realized steering differential.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811226267.7A CN109356894A (en) | 2018-10-22 | 2018-10-22 | Land leveller front-wheel drive control valve and hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811226267.7A CN109356894A (en) | 2018-10-22 | 2018-10-22 | Land leveller front-wheel drive control valve and hydraulic system |
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| CN109356894A true CN109356894A (en) | 2019-02-19 |
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| CN201811226267.7A Pending CN109356894A (en) | 2018-10-22 | 2018-10-22 | Land leveller front-wheel drive control valve and hydraulic system |
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| CN109973453A (en) * | 2019-04-01 | 2019-07-05 | 广西柳工机械股份有限公司 | Knife plate automatically controls valve group, hydraulic system and Work machine |
| CN110735458A (en) * | 2019-09-27 | 2020-01-31 | 广西柳工机械股份有限公司 | Front wheel driving hydraulic system of land leveler |
| CN114508514A (en) * | 2022-01-29 | 2022-05-17 | 徐州徐工筑路机械有限公司 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
| WO2023274210A1 (en) * | 2021-06-28 | 2023-01-05 | 湖南三一中型起重机械有限公司 | Hydraulic system capable of multi-stage pressure control and pressure speed regulation, and working machine |
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Application publication date: 20190219 |
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