CN107061387A - A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method - Google Patents
A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method Download PDFInfo
- Publication number
- CN107061387A CN107061387A CN201710204346.7A CN201710204346A CN107061387A CN 107061387 A CN107061387 A CN 107061387A CN 201710204346 A CN201710204346 A CN 201710204346A CN 107061387 A CN107061387 A CN 107061387A
- Authority
- CN
- China
- Prior art keywords
- steering
- hydraulic
- mouths
- way
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention provides a kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method, the hilly and mountainous land tractor steering synchronization hydraulic system is made up of to valve I, front steering hydraulic cylinder, two-position four-way solenoid directional control valve, rear steering hydraulic cylinder, gear distributor, two position, three-way electromagnetic change valve and two-position three-way hand change valve II manually fuel feeding component, all-hydraulic steering gear, two-position three way；Wherein, gear distributor can be turned to synchronous and return positive synchronous according to the flow required for hydraulic cylinder before and after the different proportional assignments at front-and rear-wheel steer angle so that front and back wheel is realized；The control method of the hilly and mountainous land tractor steering synchronization hydraulic system can realize front-wheel steer, rear-axle steering and four-wheel steering control；Compared with prior art, technical scheme of the present invention can realize that front-and rear-wheel steer is synchronously positive synchronous with time in the case where tractor front-and rear-wheel steer angle requirement is different.
Description
Technical field
The invention belongs to agricultural machinery hydraulic system technical field, it is adaptable to hilly and mountainous land tractor, and in particular to a kind of
Hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method.
Background technology
In recent years, due to the fast development of China's economy, agriculture development is more and more important, and tractor etc. is a series of
The use of agricultural machinery generalization, especially in the especially complex area of the landform such as mountain region and hills, the work to tractor
Intensity is higher with performance requirement, therefore works out a high-performance, it is adaptable to the baby tractor pair of China's hilly and mountainous land farming
Promote China's intelligent agriculture very crucial for developing.
Steering is a very important part in vehicle, and steering can change and recover the advance side of vehicle
To, when its straight line traveling cause for some reason deviate its direction of advance when, car can also be corrected by steering
Direction of advance.Therefore, the performance quality of tractor steering system directly affects the operating efficiency and security of tractor
Energy.
The tractor of current China using it is most be all hydraulic pressure steering-gear, all hydraulic pressure steering-gear has simple in construction
The advantages of with occupying little space, steering mode uses front-wheel steer technology.But front-wheel steer radius of turn is big, compares in physical features
Complicated hilly and mountainous land area is unfavorable for tractor work.Four-wheel steering technology can reduce radius of turn, make handling maneuver spirit
It is living.In the four-wheel steering vehicle of the existing use all hydraulic pressure steering-gear of China, the steering mechanism of front and back wheel is identical, front and back wheel
Steering angle it is identical, the stroke of front and rear hydraulic cylinder is also identical.When running into, front and back wheel wheelspan is identical, but front and back wheel size
Different, front-rear axle steering mechanism can require different, front and rear hydraulic pressure with the steering angle of the front and back wheel caused by installing space difference
During the different situation of cylinder stroke, it is synchronous with returning just synchronous ask that existing all hydraulic pressure steering-gear can not solve front-and rear-wheel steer
Topic.
Patent CN201405924Y discloses a kind of front and back wheel synchronous steering mechanism, in technical scheme described in the patent,
When vehicle is turned to, front-wheel can be made to produce steering angle equal in magnitude, in opposite direction with trailing wheel, subtract turning radius
It is small, the advantages of turning to flexible.
Although the technology of above-mentioned patent can strengthen the flexible performance of steering, vehicle can only be realized in steering, it is front and rear
Wheel is synchronous to produce steering angle equal in magnitude, in opposite direction, and does not solve a critical problem：When running into front and back wheel wheelspan phase
Together, when the steering angle of front and back wheel requires the different, situation that front and rear hydraulic cylinder travel is different, existing all hydraulic pressure steering-gear is simultaneously
It can not realize that steering is synchronously positive synchronous with time.
The content of the invention
The present invention be directed to deficiency of the prior art, it is proposed that a kind of hilly and mountainous land tractor steering synchronization hydraulic system and
Rotating direction control method, the present invention in the case where front-and rear-wheel steer angle requirement is different, can realize front-and rear-wheel steer it is synchronous with
Return positive synchronous.With reference to Figure of description, technical scheme is as follows：
A kind of hilly and mountainous land tractor steering synchronization hydraulic system, the hydraulic system is by fuel feeding component, hydro-steering
Device 6, two-position three way are manually to valve I 7, front steering hydraulic cylinder 8, two-position four-way solenoid directional control valve 9, rear steering hydraulic cylinder 12, gear
Distributor 14, two position, three-way electromagnetic change valve 15 and two-position three-way hand change valve II 17 are constituted；
Fuel tank 1 is connected with the P mouths of all-hydraulic steering gear 6, A mouths and the two-position three-way hand change valve I of all-hydraulic steering gear 6
One end P mouthfuls of 7 is connected, and the other end of two-position three-way hand change valve I 7 has A mouthfuls of hydraulic fluid port and B mouthfuls, two-position three-way hand change valve I
7 A mouths are connected with the C mouths of front steering hydraulic cylinder 8, the B mouths of two-position three-way hand change valve I 7 and the F mouths of rear steering hydraulic cylinder 12
It is connected；
The D mouths of front steering hydraulic cylinder 8 are connected for one end B mouthfuls with two position, three-way electromagnetic change valve 15, in front steering hydraulic cylinder 8
At the D mouths of C mouthfuls and front steering hydraulic cylinder 8 it is each it is in parallel all the way respectively with one end A mouthful of two-position four-way solenoid directional control valve 9 and B mouthfuls company
Connect, P mouthfuls of the other end of two-position four-way solenoid directional control valve 9 is connected with the left side of gear distributor 14, two-position four-way solenoid directional control valve 9
O mouthfuls are connected with the E mouths of rear steering hydraulic cylinder 12, the F mouths right side all the way with gear distributor 14 in parallel of rear steering hydraulic cylinder 12
It is connected, the E mouths parallel connection of rear steering hydraulic cylinder 12 is connected with one end B mouthfuls of two-position three-way hand change valve II 17 all the way, herein
Flow before and after gear distributor 14 can be divided in portion according to the difference at front-and rear-wheel steer angle required for hydraulic cylinder, so that
Front and back wheel, which is realized, to be turned to synchronous and returns positive synchronous；
One end A mouthfuls of the oil-out connection two position, three-way electromagnetic change valve 15 of gear distributor 14, two-position three-way electromagnetic is changed
It is connected to one end A mouthfuls of P mouthfuls of the other end and the two-position three-way hand change valve II 17 of valve 15, two-position three-way hand change valve II 17
P mouthfuls of the other end be connected with the B mouths of all-hydraulic steering gear 6,
The T mouths of the all-hydraulic steering gear 6 take back fuel tank 1 by return line, and are provided with return line throttling
Valve.
A kind of hilly and mountainous land tractor steering synchronization hydraulic system, wherein, one group of liquid is also included in the hydraulic system
Pressure lock 11, the hydraulic lock is made up of four hydraulic control one-way valves 10；First hydraulic control one-way valve is connected on two-position three way and changed manually
To on the connecting line of valve I 7 and rear steering hydraulic cylinder 12；Second hydraulic control one-way valve is connected on two-position four-way solenoid directional control valve 9O
Mouthful with the connecting line of 12E mouthfuls of rear steering hydraulic cylinder；3rd hydraulic control one-way valve is connected on 12F mouthfuls of rear steering hydraulic cylinder and tooth
On the connecting line for taking turns the right side of distributor 14；4th hydraulic control one-way valve is connected on 12E mouthfuls of rear steering hydraulic cylinder and two-position three way
On the connecting line that 17B mouthfuls of hand-operated direction valve II；When not needing rear steering hydraulic cylinder 12 to work, hydraulic lock 11 can turn by after
Pinned to hydraulic cylinder 12, improve the security performance of tractor.
A kind of hilly and mountainous land tractor steering synchronization hydraulic system, wherein, the fuel feeding component by fuel tank 1, constant flow pump 2,
The serial pressure tester 4 of pressure measuring tie-in 3, pressure gauge PTB, PLF Series Pressures in-line filter 5 and oil-suction oil filter 22 are constituted；Oil
Case 1 is connected by oil pipe with constant flow pump 2, and oil-suction oil filter 22 is connected on fuel tank 1 with the connecting line of constant flow pump 2, being used for
Impurity in oil strain liquid；Constant flow pump 2 is connected together with PLF Series Pressures in-line filter 5 by oil pipe；The He of pressure measuring tie-in 3
Pressure gauge PTB series pressure testers 4 are connected in parallel on the exit of constant flow pump 2, for the pressure of measuring system；PLF Series Pressure pipes
Pipe filter 5 is connected through oil pipe with the P mouths of all-hydraulic steering gear 6；
A kind of hilly and mountainous land tractor steering synchronization hydraulic system, wherein, the choke valve on return line is MG
Type choke valve 19, MG types choke valve 19 takes back fuel tank 1 by oil pipe, meanwhile, it is provided with fuel tank 1 for filtering air plankton
Hydraulic air filter 20 and for measuring the oil level in fuel tank 1 and the liquid level liquid thermometer 21 of temperature.
A kind of rotating direction control method of hilly and mountainous land tractor steering synchronization hydraulic system, the rotating direction control method includes
Front-wheel steer control process, rear-axle steering control process and four-wheel steering control process；Aspect disk rotate counterclockwise, it is all-hydraulic
The P mouths of steering gear 6 are connected with A mouthfuls, and T mouthfuls are connected with B mouthfuls；When aspect disk turns clockwise, the P mouths of all-hydraulic steering gear 6 and B mouthfuls
It is connected, T mouthfuls are connected with A mouthfuls；
In the front-wheel steer control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process,
Each valve state all same of hydraulic system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-bit triplet is changed manually
It is connected to the P mouths of valve I 7 with A mouthfuls, fluid is before the A mouths of all-hydraulic steering gear 6 are out flowed to through two-position three-way hand change valve I 7
Hydraulic steering cylinder 8；The P mouths of two position, three-way electromagnetic change valve 15 are connected with B mouthfuls, and the D hydraulic fluid ports of fluid from preceding hydraulic steering cylinder 8 come out
Two-position three-way hand change valve II 17 is flowed to through two position, three-way electromagnetic change valve 15；The P mouths of two-position three-way hand change valve II 17
It is connected with A mouthfuls, fluid out flows back to full liquid from the P mouths of two position, three-way electromagnetic change valve 15 through two-bit triplet hand-operated direction valve II 17
Press the B mouths of steering gear 6；The oil circuit of two-position four-way solenoid directional control valve 9 is closed；
In the rear-axle steering control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process,
Each valve state all same of hydraulic system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-position three way is changed manually
It is connected to the P mouths of valve I 7 with B mouthfuls, fluid is after the A mouths of all-hydraulic steering gear 6 are out flowed to through two-position three-way hand change valve I 7
The F mouths of hydraulic steering cylinder 12；The P mouths of two-position three-way hand change valve II 17 are connected with B mouthfuls, and fluid is from rear steering hydraulic cylinder 12
E mouthfuls come out the B mouths that all-hydraulic steering gear 6 is flowed back to through two-position three-way hand change valve II 17；The P of two position, three-way electromagnetic change valve 15
Mouth is connected with B mouthfuls, and fluid does not circulate；The oil circuit of two-position four-way solenoid directional control valve 9 is closed；
In the four-wheel steering control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process,
Each valve state all same of hydraulic system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-position three way is changed manually
Be connected to the P mouths of valve I 7 with A mouthfuls, the P mouths of two-position four-way solenoid directional control valve 9 and B mouthful, the O mouths of two-position four-way solenoid directional control valve 9 with
A mouthfuls are connected, and fluid is come out after two-position three-way hand change valve I 7 from the A mouths of all-hydraulic steering gear 6, and front steering liquid is flowed to all the way
The C mouths of cylinder pressure 8, another road flows to the E mouths of rear steering hydraulic cylinder 12 through two-position four-way solenoid directional control valve 9；Two-position three-way electromagnetic is changed
It is connected to the P mouths of valve 15 with A mouthfuls, the P mouths of two-position three-way hand change valve II 17 are connected with A mouthfuls, fluid is from gear distributor 14
The B mouths of all-hydraulic steering gear 6 are out flowed back to through two position, three-way electromagnetic change valve 15, two-position three-way hand change valve II 17；Gear
Distributor 14 can be according to needed for different the proportional assignment front steering hydraulic cylinders 8 and rear steering hydraulic cylinder 12 at front-and rear-wheel steer angle
The flow wanted, turns to synchronous and returns positive synchronous so that front and back wheel is realized.
Compared with prior art the beneficial effects of the invention are as follows：
1. the steering synchronization hydraulic system designed by the present invention, requires different at front-and rear-wheel steer angle, i.e., front and rear hydraulic cylinder
Stroke it is different when, using gear distributor can realize front-and rear-wheel steer it is synchronous with return it is just synchronous.Gear distributor being capable of root
Flow is divided in portion to it to the different requirements of flow according to front and rear hydraulic steering cylinder, so as to realize synchronous function.
2. in the steering synchronization hydraulic system designed by the present invention, in rear steering hydraulic cylinder import and export equipped with four hydraulic controls
Check valve, constitutes hydraulic lock.Because hilly and mountainous land tractor working environment is poor, when carrying out operation in hillside fields, hydraulic cylinder holds very much
Easily there is situation about moving, so that wheel is deflected, tractor work is dangerous, and the hydraulic lock in the present invention can not need liquid
Cylinder pressure is locked when working, and improves the operating efficiency and security performance of tractor.
3. in the steering synchronization hydraulic system designed by the present invention, when using four-wheel steering, gear distributor exit
Overflow valve be used for eliminating accumulated error each time, front and rear hydraulic cylinder starts while when stretching out, due to hydraulic cylinder before and after error
Be difficult to simultaneously reach, once there is a hydraulic steering cylinder first to reach, now the overflow valve at circuit outlet start overflow make it is another
Individual hydraulic steering cylinder works on, until two hydraulic steering cylinders are all fully extended.When hydraulic steering cylinder is returned, gear point
Orchestration starts reversion, and overflow valve now eliminates air pocket as Fill valve.
4. in the steering synchronization hydraulic system designed by the present invention, between all-hydraulic steering gear and front and rear hydraulic steering cylinder
One two position three way directional control valve of each installation, can switch steering mode, while two three by adjusting the two reversal valves respectively
Logical reversal valve chooses hand-operated direction valve, when tractor in steering procedure if circuit break down, can be by adjusting manually
The two hand-operated direction valves are saved, front and rear hydraulic cylinder is returned to middle position, tractor completes turning function.
5. in the steering synchronization hydraulic system designed by the present invention, two two-position three-way hand change valves are made into a collection
It is blocking, it is easy to operate, saves installing space.
6. in the steering synchronization hydraulic system designed by the present invention, hydraulic pressure is measured from the serial pressure testers of pressure gauge PTB
System pressure, traditional hydraulic system must install pressure gauge and pressure meter switch at each pressure spot, and pressure gauge PTB is serial
Pressure tester only needs to install pressure measuring tie-in in each pressure tap, with advanced structure, small volume, easy to use, service life
Long the advantages of.
7. in the steering synchronization hydraulic system designed by the present invention, from PLF Series Pressure in-line filters, such a filtering
Device has by-passing valve and differential pressure signaling device, when blocking occurs in filter core and inlet outlet pressure differential reaches sender setting value, now sends out
News device sends signal, changes filter core, has compact conformation using PLF Series Pressure in-line filters, installs simple, reliability height
The characteristics of.
Brief description of the drawings
Fig. 1 is a kind of composition structural representation of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention；
During Fig. 2 is a kind of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention, liquid when front-wheel is turned left
Press system schematic；
During Fig. 3 is a kind of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention, liquid when trailing wheel is turned left
Press system schematic；
During Fig. 4 is a kind of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention, when four-wheel steering is turned left
Hydraulic schematic；
During Fig. 5 a- Fig. 5 c are a kind of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention, reversal valve is in
Initial position schematic diagram, wherein：
Fig. 5 a are the initial position schematic diagram of two-position four-way solenoid directional control valve；
Fig. 5 b are the initial position schematic diagram of two position, three-way electromagnetic change valve；
Fig. 5 c are the initial position schematic diagram of two-position three-way hand change valve I and two-position three-way hand change valve II；
During Fig. 6 a- Fig. 6 c are a kind of hilly and mountainous land tractor steering synchronization hydraulic system of the present invention, reversal valve is in
Operating position schematic diagram, wherein：
Fig. 6 a are the operating position schematic diagram of two-position four-way solenoid directional control valve；
Fig. 6 b are the operating position schematic diagram of two position, three-way electromagnetic change valve；
Fig. 6 c are the operating position schematic diagram of two-position three-way hand change valve I and two-position three-way hand change valve II；
In figure：
1. fuel tank, 2. constant flow pumps, 3. pressure measuring tie-ins,
4. pressure gauge PTB series pressure testers, 5.PLF Series Pressure in-line filters, 6. all-hydraulic steering gears,
7. two-position three-way hand change valve I, 8. front steering hydraulic cylinders, 9. two-position four-way solenoid directional control valves,
10. hydraulic control one-way valve, 11. hydraulic locks, 12. rear steering hydraulic cylinders,
13.DBG type overflow valves, 14. gear distributors, 15. two position, three-way electromagnetic change valves,
16. two position, three-way electromagnetic change valve mounting base, 17. two-position three-way hand change valves II, 18. integrated packages,
19.MG type choke valves, 20. hydraulic air filters, 21. liquid level liquid thermometers,
22. oil-suction oil filter.
Embodiment
For technical scheme is expanded on further, with reference to Figure of description, embodiment of the invention is as follows：
The invention provides a kind of hilly and mountainous land tractor steering synchronization hydraulic system, the steering synchronization hydraulic system can
Realize：Front-wheel steer, three kinds of steering modes of rear-axle steering and four-wheel steering.When switching steering mode, front and rear hydraulic cylinder is necessary
Returning to middle position just allows switching.The steering synchronization hydraulic system is mainly consisted of：Fuel tank 1, constant flow pump 2, pressure measuring tie-in
3rd, the serial pressure testers 4 of pressure gauge PTB, PLF Series Pressures in-line filter 5, all-hydraulic steering gear 6, two-position three way manually to
Valve I 7, front steering hydraulic cylinder 8, two-position four-way solenoid directional control valve 9, hydraulic control one-way valve 10, rear steering hydraulic cylinder 12, DBG type overflows
Valve body 13, gear distributor 14, two position, three-way electromagnetic change valve 15, two-position three-way hand change valve II 17, MG types choke valve 19,
Hydraulic air filter 20, liquid level liquid thermometer 21 and oil-suction oil filter 22.Specific connected mode is as described below：
As shown in Fig. 1, Fig. 5 a- Fig. 5 c, the present invention discloses a kind of hilly and mountainous land tractor steering synchronization hydraulic system, fuel tank
1 is connected by oil pipe with constant flow pump 2, an oil-suction oil filter 22 of being connected on the pipeline that fuel tank 1 is connected with constant flow pump 2, is used for
Filter the impurity in fluid；Constant flow pump 2 is connected together with PLF Series Pressures in-line filter 5 by oil pipe, while in constant current
The exit of pump 2 pressure measuring tie-in 3 in parallel and the serial pressure testers 4 of pressure gauge PTB, for the pressure of measuring system；PLF systems
Row pressure piping filter 5 is connected through oil pipe with all-hydraulic steering gear 6, oil pipe that the A mouths of all-hydraulic steering gear 6 come out and two
One end P mouthfuls of threeway hand-operated direction valve I 7 is connected, and the other end of two-position three-way hand change valve I 7 has two hydraulic fluid port A and B, two
The A mouths of threeway hand-operated direction valve I 7 are connected through oil pipe with the C mouths of front steering hydraulic cylinder 8, the B mouths of two-position three-way hand change valve I 7
It is connected through oil pipe with the F mouths of rear steering hydraulic cylinder 12；Simultaneously in two-position three-way hand change valve I 7 and rear steering hydraulic cylinder 12
A hydraulic control one-way valve 10 is connected on connecting line to control the direction of fluid.The D mouths of front steering hydraulic cylinder 8 and two-position three way electricity
One end B mouthfuls of magnetic reversal valve 15 connection, each parallel connection is all the way at C mouths of front steering hydraulic cylinder 8 and the D mouths of front steering hydraulic cylinder 8
Oil pipe is connected on one end A mouthfuls and B mouthfuls, P mouthfuls of the other end of two-position four-way solenoid directional control valve 9 of two-position four-way solenoid directional control valve 9 respectively
It is connected with the left side of gear distributor 14, the O mouths of two-position four-way solenoid directional control valve 9 pass through a hydraulic control one-way valve 10 and rear steering liquid
The E mouths of cylinder pressure 12 are connected, and the F mouths parallel connection of rear steering hydraulic cylinder 12 all the way and passes through a hydraulic control one-way valve 10 and gear distributor
14 right side is connected, and the E mouths of rear steering hydraulic cylinder 12 are in parallel all the way and manual by a hydraulic control one-way valve 10 and two-position three way
One end B mouthfuls of connection of reversal valve II 17, gear distributor 14 herein can in proportion divide according to the difference at front-and rear-wheel steer angle
With the flow required for front and rear hydraulic cylinder, turn to synchronous and return positive synchronous so that front and back wheel is realized；Rear steering hydraulic cylinder 12 enters
Four hydraulic control one-way valves 10 connected on oil-out pipeline constitute hydraulic lock 11, when not needing rear steering hydraulic cylinder 12 to work,
Hydraulic lock 11 can pin rear steering hydraulic cylinder 12, improve the security performance of tractor.Gear distributor 14 is connected through oil pipe
To one end A mouthfuls of two position, three-way electromagnetic change valve 15, P mouthfuls of the other end of two position, three-way electromagnetic change valve 15 is manual with two-position three way
One end A mouthfuls of reversal valve II 17 is connected with oil pipe, and P mouthfuls of the other end of two-position three-way hand change valve II 17 passes through oil pipe and full liquid
The B mouths of pressure steering gear 6 connect, wherein, two-position three-way hand change valve I 7 is used as front-wheel with two-position three-way hand change valve II 17
The switching between rear-axle steering is turned to, and two-position three-way hand change valve I 7 constitutes one with two-position three-way hand change valve II 17
Individual integrated package 18, it is easy to operate, save installing space；Two-position four-way solenoid directional control valve 9 is used with two position, three-way electromagnetic change valve 15
Make the switching between front-wheel steer and four-wheel steering and between rear-axle steering and four-wheel steering.The T of the all-hydraulic steering gear 6
Mouth is connected through oil pipe with MG types choke valve 19, and MG types choke valve 19 takes back fuel tank 1 by oil pipe, meanwhile, liquid is installed at fuel tank 1
Air cleaner 20 and liquid level liquid thermometer 21 are pressed, wherein, hydraulic air filter 20 is used for filtering the air of suction and new addition
Impurity in fluid；Liquid level liquid thermometer 21 is used for measuring the oil level and temperature in fuel tank 1, is returned so as to form a complete hydraulic pressure
Road.When tractor is not turned to, the P mouths of all-hydraulic steering gear 6 are connected with T mouthfuls, and fluid flows out from fuel tank 1, sequentially passes through oil suction
Oil filter 22, constant flow pump 2, PLF Series Pressures in-line filter 5 flow into the P mouths of all-hydraulic steering gear 6, through all-hydraulic steering gear 6
T mouths outflow, flow back to fuel tank 1 by MG types choke valve 19.
With reference to above-mentioned steering synchronization hydraulic system, invention additionally provides hilly and mountainous land tractor steering control method, including：
Front-wheel steer, three kinds of steering modes of rear-axle steering and four-wheel steering.Aspect disk rotate counterclockwise, the P mouths of all-hydraulic steering gear 6 and
A mouthfuls are connected, and T mouthfuls are connected with B mouthfuls；When aspect disk turns clockwise, the P mouths of all-hydraulic steering gear 6 are connected with B mouthfuls, T mouthfuls and A mouthfuls
It is connected.Three kinds of steering modes are specifically discussed respectively below：
First, front-wheel steer：
As shown in Fig. 2, Fig. 5 a- Fig. 5 c, Fig. 6 a- Fig. 6 c, when steering mode selects front-wheel steer, including two-position three way hand
Dynamic reversal valve I 7, two-position three-way hand change valve II 17, two-position four-way solenoid directional control valve 9 and two position, three-way electromagnetic change valve 15 exist
Interior all reversal valves are in initial position, now initial position (one end for carrying spring) phase of oil pipe and all reversal valves
Connect, i.e. the P mouths of two-position three-way hand change valve I 7 are connected with A mouthfuls, fluid is come out through two three from the A mouths of all-hydraulic steering gear 6
Logical hand-operated direction valve I 7 flows to front steering hydraulic cylinder 8；The P mouths of two position, three-way electromagnetic change valve 15 are connected with B mouthfuls, and fluid is from forward
Out two-position three-way hand change valve II 17 is flowed to the D hydraulic fluid ports of hydraulic cylinder 8 through two position, three-way electromagnetic change valve 15；Two-position three way
The P mouths of hand-operated direction valve II 17 are connected with A mouthfuls, and fluid is come out through two-position three way hand from the P mouths of two position, three-way electromagnetic change valve 15
Dynamic reversal valve II 17 flows back to the B mouths of all-hydraulic steering gear 6；The oil circuit of two-position four-way solenoid directional control valve 9 is closed, fluid
Do not circulate.When being rotated clockwise or counter-clockwise due to steering wheel, the operation principle of all-hydraulic steering gear 6 is identical, this side of sentencing
To exemplified by the operation principle of disk rotate counterclockwise, the four-wheel steering synchronization hydraulic system acquiescence steering mode designed by the present invention is
Front-wheel steer, front-wheel steer synchronization hydraulic system operation principle is as described below：
Fluid flows out from fuel tank 1, is flowed into by oil-suction oil filter 22, constant flow pump 2, PLF Series Pressures in-line filter 5
The P mouths of all-hydraulic steering gear 6, now because the P mouths of all-hydraulic steering gear 6 are connected with A mouthfuls, A of the fluid from all-hydraulic steering gear 6
Mouth outflow, by two-position three-way hand change valve I 7, flows to the C mouths of front steering hydraulic cylinder 8, promotes the work of front steering hydraulic cylinder 8
Stopper rod is moved right, the D mouths outflow of the premenstrual hydraulic steering cylinder 8 of fluid, then by two position, three-way electromagnetic change valve 15, two-position three way
Hand-operated direction valve II 17 flows back to the B mouths of all-hydraulic steering gear 6, and now the B mouths of all-hydraulic steering gear 6 are connected with T mouthfuls, and fluid passes through
The T mouths outflow of all-hydraulic steering gear 6, fuel tank 1 is flowed back to by MG types choke valve 19.
2nd, rear-axle steering：
As shown in Fig. 3, Fig. 5 a- Fig. 5 c, Fig. 6 a- Fig. 6 c, when steering mode selects rear-axle steering, two-position three way hand is adjusted
Dynamic reversal valve I 7 and two-position three-way hand change valve II 17 act it, and other reversal valves are in initial position, now oil pipe
Connect with the operating position (one end for carrying handle) of two-position three-way hand change valve 7 and two-position three-way hand change valve 17, with
The initial position (one end for carrying spring) of two-position four-way solenoid directional control valve 9 and two position, three-way electromagnetic change valve 15 connects, i.e., and two
The P mouths of position threeway hand-operated direction valve I 7 are connected with B mouthfuls, and fluid is out changed manually from the A mouths of all-hydraulic steering gear 6 through two-position three way
The F mouths of rear steering hydraulic cylinder 12 are flowed to valve I 7；The P mouths of two-position three-way hand change valve II 17 are connected with B mouthfuls, and fluid is from rear turn
The B mouths that all-hydraulic steering gear 6 is flowed back to through two-position three-way hand change valve II 17 are come out to the E mouths of hydraulic cylinder 12；Two-position three way electricity
The P mouths of magnetic reversal valve 15 are connected with B mouthfuls, and fluid does not circulate；The oil circuit of two-position four-way solenoid directional control valve 9 is closed, oil
Liquid does not circulate.When being rotated clockwise or counter-clockwise due to steering wheel, the operation principle of all-hydraulic steering gear 6 is identical, and this is sentenced
Exemplified by the operation principle of steering wheel rotate counterclockwise, four-wheel steering synchronization hydraulic system operation principle is as described below：
Fluid flows out from fuel tank 1, is flowed into by oil-suction oil filter 22, constant flow pump 2, PLF Series Pressures in-line filter 5
The P mouths of all-hydraulic steering gear 6, now because the P mouths of all-hydraulic steering gear 6 are connected with A mouthfuls, A of the fluid from all-hydraulic steering gear 6
Mouth outflow, by two-position three-way hand change valve I 7, hydraulic control one-way valve 10, flows to the F mouths of rear steering hydraulic cylinder 12, turns after promotion
To the piston rod of hydraulic cylinder 12 to left movement, fluid through rear steering hydraulic cylinder 12 E mouths outflow, then by hydraulic control one-way valve 10,
Two-position three-way hand change valve II 17 flows back to the B mouths of all-hydraulic steering gear 6, and now the B mouths of all-hydraulic steering gear 6 are connected with T mouthfuls,
Fluid is flowed out by the T mouths of all-hydraulic steering gear 6, and fuel tank 1 is flowed back to by MG type choke valves stream 19.
3rd, four-wheel steering：
As shown in Fig. 4, Fig. 5 a- Fig. 5 c, Fig. 6 a- Fig. 6 c, when steering mode selects four-wheel steering, regulation two-position four-way electricity
Magnetic reversal valve 9 and two position, three-way electromagnetic change valve 15 act it, and other reversal valves are in initial position, now oil pipe and two
The operating position (one end for carrying electromagnet) of position four-way electromagnetic reversing valve 9 and two position, three-way electromagnetic change valve 15 connects, with two
The initial position (one end for carrying spring) of position threeway hand-operated direction valve I 7 and two-position three-way hand change valve II 17 connects, i.e., and two
The P mouths of position threeway hand-operated direction valve I 7 are connected for 7A mouthfuls with two-position three-way hand change valve I, the P mouths of two-position four-way solenoid directional control valve 9
With B mouthfuls, the O mouths of two-position four-way solenoid directional control valve 9 are connected with A mouthfuls, and fluid is from the A mouths of all-hydraulic steering gear 6 out through two three
After logical hand-operated direction valve I 7, the C mouths of front steering hydraulic cylinder 8 are flowed to all the way, after another road is flowed to through two-position four-way solenoid directional control valve 9
The E mouths of hydraulic steering cylinder 12；The P mouths of two position, three-way electromagnetic change valve 15 are connected with the A mouths of two position, three-way electromagnetic change valve 15, and two
The P mouths of position threeway hand-operated direction valve II 17 are connected with A mouthfuls, and fluid is from gear distributor 14 out through two position, three-way electromagnetic change valve
15th, two-position three-way hand change valve II 17 flows back to the B mouths of all-hydraulic steering gear 6.Because steering wheel revolves clockwise or counter-clockwise
When turning, the operation principle of all-hydraulic steering gear 6 is identical, and this is sentenced exemplified by the operation principle of steering wheel rotate counterclockwise, four rotation
It is as described below to synchronization hydraulic system operation principle：
Fluid flows out from fuel tank 1, is flowed into by oil-suction oil filter 22, constant flow pump 2, PLF Series Pressures in-line filter 5
The P mouths of all-hydraulic steering gear 6, now because the P mouths of all-hydraulic steering gear 6 are connected with A mouthfuls, A of the fluid from all-hydraulic steering gear 6
Mouth outflow, by two-position three-way hand change valve I 7, flows to the C mouths of front steering hydraulic cylinder 8, fluid-control one-way is passed through on another road all the way
Valve 10 flows to the E mouths of rear steering hydraulic cylinder 12, promotes the piston rod of front steering hydraulic cylinder 8 and rear steering hydraulic cylinder 12 to transport to the right
It is dynamic, the F mouths outflow of D mouths and rear steering hydraulic cylinder 12 of the premenstrual hydraulic steering cylinder 8 of fluid, the D mouths of front steering hydraulic cylinder 8 are out
Fluid flows to the left side of gear distributor 14 by two-position four-way solenoid directional control valve 9, the oil of F mouths of rear steering hydraulic cylinder 12 out
Liquid flows to the right side of gear distributor 14 by hydraulic control one-way valve 10, and the fluid come out from gear distributor 14 passes through two-position three way
Solenoid directional control valve 15, two-position three-way hand change valve II 17 flow back to the B mouths of all-hydraulic steering gear 6, now all-hydraulic steering gear 6
B mouthfuls are connected with T mouthfuls, and fluid is flowed out by the T mouths of all-hydraulic steering gear 6, and fuel tank 1 is flowed back to by MG types choke valve 19.
Claims (5)
1. a kind of hilly and mountainous land tractor steering synchronization hydraulic system, it is characterised in that：
The hydraulic system is from fuel feeding component, all-hydraulic steering gear (6), two-position three way manually to valve I (7), front steering hydraulic cylinder
(8), two-position four-way solenoid directional control valve (9), rear steering hydraulic cylinder (12), gear distributor (14), two position, three-way electromagnetic change valve
(15) constituted with two-position three-way hand change valve II (17)；
Fuel tank (1) is connected with the P mouths of all-hydraulic steering gear (6), A mouths and the two-position three way manual reverse of direction of all-hydraulic steering gear (6)
One end P mouthfuls of valve I (7) is connected, and the other end of two-position three-way hand change valve I (7) has A mouthfuls and B mouthfuls of hydraulic fluid port, and two-position three way is manual
The A mouths of reversal valve I (7) are connected with the C mouths of front steering hydraulic cylinder (8), the B mouths and rear steering of two-position three-way hand change valve I (7)
The F mouths of hydraulic cylinder (12) are connected；
The D mouths of front steering hydraulic cylinder (8) are connected for one end B mouthfuls with two position, three-way electromagnetic change valve (15), in front steering hydraulic cylinder (8)
C mouths and front steering hydraulic cylinder (8) D mouths at it is each it is in parallel all the way respectively with one end A mouthfuls of two-position four-way solenoid directional control valve (9) and
B mouthfuls of connections, P mouthfuls of the other end of two-position four-way solenoid directional control valve (9) on the left of gear distributor (14) with being connected, two-position four-way electromagnetism
The O mouths of reversal valve (9) are connected with the E mouths of rear steering hydraulic cylinder (12), the F mouths of rear steering hydraulic cylinder (12) it is in parallel all the way with gear
The right side of distributor (14) is connected, the E mouths parallel connection of rear steering hydraulic cylinder (12) all the way with two-position three-way hand change valve II (17)
One end B mouthfuls of connection, gear distributor (14) herein can be according to liquid before and after the different proportional assignments at front-and rear-wheel steer angle
Flow required for cylinder pressure, turns to synchronous and returns positive synchronous so that front and back wheel is realized；
One end A mouthfuls of the oil-out connection two position, three-way electromagnetic change valve (15) of gear distributor (14), two-position three-way electromagnetic is changed
It is connected to one end A mouthfuls of P mouthfuls of the other end and the two-position three-way hand change valve II (17) of valve (15), two-position three-way hand change valve
P mouthfuls of the other end of II (17) is connected with the B mouths of all-hydraulic steering gear (6),
The T mouths of the all-hydraulic steering gear (6) take back fuel tank (1) by return line, and are provided with return line throttling
Valve.
2. a kind of hilly and mountainous land tractor steering synchronization hydraulic system as claimed in claim 1, it is characterised in that：
Also include one group of hydraulic lock (11) in the hydraulic system, the hydraulic lock is made up of four hydraulic control one-way valves (10)；
First hydraulic control one-way valve is connected on the connecting line of two-position three-way hand change valve I (7) and rear steering hydraulic cylinder (12)；The
Two hydraulic control one-way valves are connected on the connecting line of E mouthfuls of O mouthfuls of two-position four-way solenoid directional control valve (9) and rear steering hydraulic cylinder (12)
On；3rd hydraulic control one-way valve be connected on F mouthfuls of rear steering hydraulic cylinder (12) with the connecting line on the right side of gear distributor (14)；
4th hydraulic control one-way valve is connected on the connection of B mouthfuls of E mouthfuls of rear steering hydraulic cylinder (12) and two-position three-way hand change valve II (17)
On pipeline；When not needing rear steering hydraulic cylinder (12) work, hydraulic lock (11) can pin rear steering hydraulic cylinder (12), carry
The security performance of high tractor.
3. a kind of hilly and mountainous land tractor steering synchronization hydraulic system as claimed in claim 1, it is characterised in that：
The fuel feeding component is by fuel tank (1), constant flow pump (2), pressure measuring tie-in (3), the serial pressure testers (4) of pressure gauge PTB, PLF
Series Pressure in-line filter (5) and oil-suction oil filter (22) composition；Fuel tank (1) is connected by oil pipe with constant flow pump (2), oil suction
Oil filter (22) is connected on the connecting line of fuel tank (1) and constant flow pump (2), for filtering the impurity in fluid；Constant flow pump (2)
Connected together with PLF Series Pressures in-line filter (5) by oil pipe；Pressure measuring tie-in (3) and the serial pressure measurement dresses of pressure gauge PTB
The exit that (4) are connected in parallel on constant flow pump (2) is put, for the pressure of measuring system；PLF Series Pressures in-line filter (5) is through oil
Pipe is connected with the P mouths of all-hydraulic steering gear (6).
4. a kind of hilly and mountainous land tractor steering synchronization hydraulic system as described in claim 1 or 3, it is characterised in that：
Choke valve on return line is MG types choke valve (19), and MG types choke valve (19) takes back fuel tank by oil pipe
(1), meanwhile, hydraulic air filter (20) for filtering air plankton is installed at fuel tank (1) place and for measuring oil
The liquid level liquid thermometer (21) of oil level and temperature in case (1).
5. a kind of rotating direction control method of hilly and mountainous land tractor steering synchronization hydraulic system as claimed in claim 4, its feature
It is：
The rotating direction control method was controlled including front-wheel steer control process, rear-axle steering control process and four-wheel steering
Journey；Aspect disk rotate counterclockwise, the P mouths of all-hydraulic steering gear (6) are connected with A mouthfuls, and T mouthfuls are connected with B mouthfuls；Aspect disk dextrorotation
When turning, the P mouths of all-hydraulic steering gear (6) are connected with B mouthfuls, and T mouthfuls are connected with A mouthfuls；
In the front-wheel steer control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process, hydraulic pressure
Each valve state all same of system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-bit triplet hand-operated direction valve
The P mouths of I (7) are connected with A mouthfuls, and fluid is out flowed to from the A mouths of all-hydraulic steering gear (6) through two-position three-way hand change valve I (7)
Front steering hydraulic cylinder (8)；The P mouths of two position, three-way electromagnetic change valve (15) are connected with B mouthfuls, D of the fluid from preceding hydraulic steering cylinder (8)
Hydraulic fluid port out flows to two-position three-way hand change valve II (17) through two position, three-way electromagnetic change valve (15)；Two-position three way manual reverse of direction
The P mouths of valve II (17) are connected with A mouthfuls, and fluid is out changed manually from the P mouths of two position, three-way electromagnetic change valve (15) through two-bit triplet
The B mouths of all-hydraulic steering gear (6) are flowed back to valve II (17)；The oil circuit of two-position four-way solenoid directional control valve (9) is closed；
In the rear-axle steering control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process, hydraulic pressure
Each valve state all same of system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-position three-way hand change valve
The P mouths of I (7) are connected with B mouthfuls, and fluid is out flowed to from the A mouths of all-hydraulic steering gear (6) through two-position three-way hand change valve I (7)
The F mouths of rear steering hydraulic cylinder (12)；The P mouths of two-position three-way hand change valve II (17) are connected with B mouthfuls, and fluid is from rear steering hydraulic pressure
The E mouths of cylinder (12) come out the B mouths that all-hydraulic steering gear (6) is flowed back to through two-position three-way hand change valve II (17)；Two-position three way electricity
The P mouths of magnetic reversal valve (15) are connected with B mouthfuls, and fluid does not circulate；The oil circuit of two-position four-way solenoid directional control valve (9), which is in, closes shape
State；
In the four-wheel steering control process, aspect disk turn clockwise with aspect disk rotate counterclockwise control process, hydraulic pressure
Each valve state all same of system, and fluid flow to it is reciprocal；When steering wheel rotate counterclockwise, two-position three-way hand change valve
The P mouths of I (7) are connected with A mouthfuls, the P mouths of two-position four-way solenoid directional control valve (9) and B mouthfuls, the O mouths of two-position four-way solenoid directional control valve (9)
It is connected with A mouthfuls, fluid is come out after two-position three-way hand change valve I (7) from the A mouths of all-hydraulic steering gear (6), before flowing to all the way
The C mouths of hydraulic steering cylinder (8), another road flows to the E mouths of rear steering hydraulic cylinder (12) through two-position four-way solenoid directional control valve (9)；Two
The P mouths of position three-way solenoid valve (15) are connected with A mouthfuls, and the P mouths of two-position three-way hand change valve II (17) are connected with A mouthfuls, oil
Liquid is out flowed back to entirely from gear distributor (14) through two position, three-way electromagnetic change valve (15), two-position three-way hand change valve II (17)
The B mouths of hydraulic steering gear (6)；Gear distributor (14) can be divided in portion front steering liquid according to the different of front-and rear-wheel steer angle
Flow required for cylinder pressure (8) and rear steering hydraulic cylinder (12), turns to synchronous and returns positive synchronous so that front and back wheel is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204346.7A CN107061387B (en) | 2017-03-31 | 2017-03-31 | A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204346.7A CN107061387B (en) | 2017-03-31 | 2017-03-31 | A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107061387A true CN107061387A (en) | 2017-08-18 |
| CN107061387B CN107061387B (en) | 2018-06-08 |
Family
ID=59602574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710204346.7A Expired - Fee Related CN107061387B (en) | 2017-03-31 | 2017-03-31 | A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107061387B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1431163A2 (en) * | 2002-12-17 | 2004-06-23 | Still Gmbh | Hydraulic drive |
| CN202266536U (en) * | 2011-09-29 | 2012-06-06 | 徐州重型机械有限公司 | Hydraulic control valve and engineering machinery running system |
| CN102582425A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Walking hydraulic control system and self-walking type engineering machinery utilizing same |
| JP2013103815A (en) * | 2011-11-15 | 2013-05-30 | Ihi Inspection & Instrumentation Co Ltd | Hydraulic control device for conveying device |
| CN206708118U (en) * | 2017-03-31 | 2017-12-05 | 吉林大学 | A kind of hilly and mountainous land tractor steering synchronization hydraulic system |
-
2017
- 2017-03-31 CN CN201710204346.7A patent/CN107061387B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1431163A2 (en) * | 2002-12-17 | 2004-06-23 | Still Gmbh | Hydraulic drive |
| CN202266536U (en) * | 2011-09-29 | 2012-06-06 | 徐州重型机械有限公司 | Hydraulic control valve and engineering machinery running system |
| JP2013103815A (en) * | 2011-11-15 | 2013-05-30 | Ihi Inspection & Instrumentation Co Ltd | Hydraulic control device for conveying device |
| CN102582425A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Walking hydraulic control system and self-walking type engineering machinery utilizing same |
| CN206708118U (en) * | 2017-03-31 | 2017-12-05 | 吉林大学 | A kind of hilly and mountainous land tractor steering synchronization hydraulic system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107061387B (en) | 2018-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105539574B (en) | Automobile back wheel turns to electronically controlled hydraulic system and its control method | |
| CN104058001B (en) | Bidirectional steering vehicle hydraulic system with multi-mode steering and automatic centering function | |
| CN105438256B (en) | Rotating direction control method, device and crane | |
| CN206708118U (en) | A kind of hilly and mountainous land tractor steering synchronization hydraulic system | |
| CN108791479A (en) | Fluid-link steering control system and crane | |
| CN203485989U (en) | Hydraulic control valve bank for crane steering shaft locking, steering system and crane | |
| CN107128362A (en) | A kind of small-sized narrow-track tractor four-wheel steering synchronization system and rotating direction control method | |
| CN103192874A (en) | Steering control device for four-wheel transport vehicle | |
| CN201472461U (en) | Axle steering and locking converting control system | |
| CN206841512U (en) | A kind of hilly and mountainous land tractor four-wheel steering system | |
| CN107061387B (en) | A kind of hilly and mountainous land tractor steering synchronization hydraulic system and rotating direction control method | |
| CN201037224Y (en) | Full hydraulic pressure double steel roller closed-loop steering valve-control system | |
| CN109466527A (en) | A kind of intelligence control system based on electrichydraulic control | |
| CN103465955A (en) | Hydraulic control valve bank for locking steering shaft of crane, steering system and crane | |
| CN110001772A (en) | A kind of steering control system for four-wheel wet-spraying machine | |
| CN102350930A (en) | Hydraulic system for automotive driving stabilizer bar | |
| CN207535976U (en) | A kind of aerial work platform four-wheel steering hydraulic system | |
| CN104930016B (en) | Turn to and return positive bifunctional hydraulic cylinder | |
| CN201890263U (en) | Electronically-controlled hydraulic power steering system for vehicle | |
| CN207328580U (en) | A kind of automobile hydraulic variable ratio steering | |
| CN209409812U (en) | Pendulum waist tractor with automatic Pilot and torque distribution function | |
| CN203580932U (en) | Charging brake valve set of wheel type hydraulic shovel | |
| CN203450197U (en) | Hydraulic steering system of tractor | |
| CN206813094U (en) | A kind of small-sized narrow-track tractor four-wheel steering synchronization system | |
| CN202163273U (en) | Hydraulic system used for driving stabilizer bar of automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180608 Termination date: 20210331 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |