CN113212548B - Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery - Google Patents
Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery Download PDFInfo
- Publication number
- CN113212548B CN113212548B CN202110656296.2A CN202110656296A CN113212548B CN 113212548 B CN113212548 B CN 113212548B CN 202110656296 A CN202110656296 A CN 202110656296A CN 113212548 B CN113212548 B CN 113212548B
- Authority
- CN
- China
- Prior art keywords
- oil
- turn
- steering
- turning
- value
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title abstract description 40
- 238000001514 detection method Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
- B62D5/064—Pump driven independently from vehicle engine, e.g. electric driven pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
Abstract
The application relates to the technical field of engineering machinery steering, in particular to an unloading method of a steering power-assisted system, the steering power-assisted system and engineering machinery; the unloading method of the power steering system comprises the following steps: acquiring a left-turning hydraulic value in a left-turning oil way; acquiring a right-turn hydraulic value in a right-turn oil way; comparing the left-turning hydraulic pressure value with the right-turning hydraulic pressure value to obtain a pressure difference value; comparing the pressure difference value with a hydraulic rated value and correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to realize unloading; therefore, hydraulic unloading in the left-turn or right-turn process of the vehicle is realized. Meanwhile, hydraulic unloading can be carried out at any steering angle in the steering process of the vehicle, and the steering safety of the vehicle is improved.
Description
Technical Field
The application relates to the technical field of engineering machinery steering, in particular to an unloading method of a steering power-assisted system, the steering power-assisted system and engineering machinery.
Background
When the engineering machinery needs to turn to the running direction in the running process, the front wheel and the rear wheel need to be driven to synchronously rotate, and the steering gear is generally arranged on the front wheel, so that a power-assisted system connected with the steering gear is usually arranged on the rear wheel accessory, the power-assisted system can drive the rear wheel to rotate along with the action of the steering gear, and the rear wheel can keep synchronously rotating with the front wheel.
Chinese patent publication No. CN111731378A discloses a steering cylinder assembly with a stroke unloading valve, which includes a cylinder body, a piston rod and a stroke unloading valve. When the vehicle turns right and needs unloading, the pressure difference in different oil cavities in the cylinder body completes unloading through the matching of the piston rod and the stroke unloading valve, but the unloading process only aims at the unloading when the vehicle turns right, the application range is small, and the safety of a vehicle steering system is poor.
Disclosure of Invention
In view of this, the embodiment of the present application provides an unloading method for a steering assist system, a steering assist system and an engineering machine, which solve or improve the problem that the safety of a vehicle steering system is poor due to the fact that a hydraulic system is unloaded when a vehicle can only turn right.
In a first aspect, the present application provides a method for unloading a steering assist system, configured to unload an assist to a steering system hydraulic pressure, where the method for unloading the steering assist system includes: acquiring a left-turning hydraulic value in a left-turning oil way; acquiring a right-turn hydraulic value in a right-turn oil way; comparing the left-turn hydraulic pressure value with the right-turn hydraulic pressure value to obtain a pressure difference value; comparing the pressure difference value with a hydraulic rated value and correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to realize unloading; the left-turning oil way is an oil way through which oil flows when the vehicle turns left relative to the advancing direction; the right-turn oil passage is an oil passage through which oil flows when the vehicle turns right relative to the advancing direction.
In combination with the first aspect, according to the unloading method for the steering assist system provided by the application, when a vehicle turns left, oil correspondingly flows into a left-turning oil way, a left-turning hydraulic value in the left-turning oil way and a right-turning hydraulic value in the right-turning oil way are obtained, the left-turning hydraulic value and the right-turning hydraulic value are compared to obtain a pressure difference value, the pressure difference value is compared with a hydraulic rated value, and the left-turning hydraulic value in the corresponding left-turning oil way is correspondingly adjusted according to a comparison result to achieve unloading of the left-turning oil way. When the vehicle turns right, the unloading principle of the right-turn oil way is the same as that of the left-turn oil way, and the unloading principle is not repeated. Therefore, hydraulic unloading in the left-turn or right-turn process of the vehicle is realized. Meanwhile, hydraulic unloading can be carried out at any steering angle in the steering process of the vehicle, and the steering safety of the vehicle is improved.
With reference to the first aspect, in a possible implementation manner, the comparing the pressure difference value with a hydraulic rated value and correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to achieve unloading specifically includes: when the pressure difference value is larger than the hydraulic rated value, correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to realize unloading; when the night pressure difference is less than or equal to the hydraulic rated value, stopping the adjustment of the left-turn hydraulic value or the right-turn hydraulic value.
With reference to the first aspect, in a possible implementation manner, when the pressure difference is greater than the hydraulic rated value, correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to achieve unloading specifically includes: when the left-turn hydraulic value is greater than the right-turn hydraulic value and the pressure difference value is generated, oil in the left-turn oil way flows to the right-turn oil way to achieve unloading of the left-turn oil way; when the pressure difference is generated when the right-turn hydraulic value is greater than the left-turn hydraulic value, the oil in the right-turn oil way flows into the left-turn oil way to realize unloading of the right-turn oil way.
With reference to the first aspect, in a possible implementation manner, the unloading method for the power steering system further includes: and when the pressure difference value is larger than the hydraulic rated value, controlling the input amount of oil in the steering system.
In a second aspect, the present application provides a power steering system for implementing the unloading method of the power steering system, the power steering system comprising: a booster cylinder; the left-turning oil way is connected with the power-assisted oil cylinder; the right-turning oil way is connected with the power-assisted oil cylinder; a detection assembly configured to acquire the left turn hydraulic value in the left turn oil passage and acquire the right turn hydraulic value in the right turn oil passage; the control part is in communication connection with the detection assembly, acquires the left-turn hydraulic pressure value and the right-turn hydraulic pressure value detected by the detection assembly, compares the left-turn hydraulic pressure value and the right-turn hydraulic pressure value to acquire a pressure difference value, compares the pressure difference value with the hydraulic rated value to acquire and output a control signal; and the unloading assembly is connected with the left-turning oil way, the unloading assembly is connected with the right-turning oil way, the unloading assembly is in communication connection with the control part to receive the control signal output by the control part, and the unloading assembly is configured to adjust the left-turning hydraulic value or the right-turning hydraulic value according to the control signal.
In combination with the second aspect, the application provides a power steering system, through setting up the off-load subassembly, when the vehicle turns left, fluid flows to power cylinder through the left-turn oil circuit, thereby power cylinder produces corresponding power steering assistance and turns to. In the steering process, the detection assembly detects a left-turning hydraulic value and a right-turning hydraulic value simultaneously and transmits the left-turning hydraulic value and the right-turning hydraulic value to the control part, the control part compares the left-turning hydraulic value and the right-turning hydraulic value to obtain a pressure difference value, the pressure difference value is compared with a hydraulic rated value to obtain and output a control signal, the unloading assembly receives the control signal and adjusts the left-turning hydraulic value in the left-turning oil way according to the control signal to unload the left-turning oil way; when the vehicle turns right, the unloading principle of the right-turn oil way is the same as that of the left-turn oil way, and the unloading principle is not repeated. Therefore, unloading in the process of left turning or right turning of the vehicle is realized, unloading when the vehicle turns to any angle can be realized, and safety of turning of the vehicle is improved.
With reference to the second aspect, in one possible implementation manner, the power cylinder includes: a cylinder body having an oil chamber therein; the piston is connected in the oil cavity in a sliding mode, the piston divides the oil cavity into a left-turning oil cavity and a right-turning oil cavity, the left-turning oil cavity is communicated with the left-turning oil way, and the right-turning oil cavity is communicated with the right-turning oil way; the unloading assembly is arranged in the piston to conduct or separate the right-turning oil cavity and the left-turning oil cavity in a single direction.
With reference to the second aspect, in one possible implementation manner, the unloading assembly includes: the piston is provided with a left through hole, the left-turning one-way unloading valve is arranged in the left through hole, and the left-turning one-way unloading valve is in communication connection with the control part so as to unidirectionally conduct or separate the left-turning oil cavity and the right-turning oil cavity according to the control signal output by the control part; the piston is provided with a right through hole, the right-turning one-way unloading valve is arranged in the right through hole, and the right-turning one-way unloading valve is in communication connection with the control part so as to unidirectionally conduct or separate the right-turning oil cavity and the left-turning oil cavity according to the control signal output by the control part; the left-turn one-way unloading valve and the right-turn one-way unloading valve are reversely mounted.
With reference to the second aspect, in one possible implementation manner, the detection component includes: a left-turn detection section provided on the left-turn oil passage to acquire the left-turn hydraulic pressure value; and a right-turn detection portion that is provided on the right-turn oil passage to acquire the right-turn hydraulic pressure value.
With reference to the second aspect, in a possible implementation manner, the control portion is in communication connection with a steering oil pump, and the steering oil pump is configured to adjust a displacement of oil input to the steering system according to the control signal output by the control portion.
In a third aspect, the present application further provides a work machine, comprising: a wheel; a steering assist system; the steering mechanism is respectively connected with the wheels and the power steering system, and is configured to be matched with the power steering system to drive the corresponding wheels to synchronously rotate so as to realize steering.
In combination with the third aspect, the application further provides an engineering machine, when the engineering machine needs to steer in the operation process, the steering mechanism and the steering assisting system synchronously drive the corresponding wheels to rotate, so that the operation direction of the engineering machine is smoothly changed.
With reference to the third aspect, in one possible implementation manner, the steering mechanism includes: a steering oil tank; the steering oil pump is provided with an oil pumping port and an oil delivery port, and the oil pumping port is connected with the steering oil tank; the power steering gear is provided with an oil inlet, a left-turning oil outlet, a right-turning oil outlet and an output end, the oil inlet is communicated with the oil delivery port, the left-turning oil way is communicated with the left-turning oil outlet, the right-turning oil way is communicated with the right-turning oil outlet, and the power steering gear is provided with a pressure unloading valve for unloading hydraulic pressure in the power steering gear; and the transmission assembly is connected with the wheels so as to transmit the steering power of the power steering gear and the steering power-assisted system to the wheels.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for unloading a power steering system according to some embodiments of the present disclosure.
Fig. 2 is a schematic flow chart illustrating a process of adjusting a left-turn hydraulic pressure value or a right-turn hydraulic pressure value to achieve unloading by comparing a pressure difference value with a hydraulic rated value according to some embodiments of the present disclosure.
FIG. 3 is a schematic diagram illustrating a hydraulic unloading process when the pressure difference is greater than the hydraulic rated value according to some embodiments of the present disclosure.
FIG. 4 is a hydraulic schematic of a steering assist system according to some embodiments of the present disclosure.
FIG. 5 is a schematic diagram of a power cylinder according to some embodiments of the present disclosure.
FIG. 6 is a schematic cross-sectional view of a load relieving assembly of a power cylinder according to some embodiments of the present disclosure.
Fig. 7 shows an enlarged view of the portion a in the implementation shown in fig. 6.
Fig. 8 shows a schematic view of a construction machine according to some embodiments of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Summary of the application
When the operation direction of the engineering machinery needs to be changed in the operation process, the wheels need to be rotated by utilizing hydraulic pressure, so that the steering of the engineering machinery is realized; in the related technology, when the engineering machinery is in steering, and when the oil pressure in the cylinder body is large and unloading is needed, the unloading process can only unload for the right turn of the vehicle, and can unload at the extreme position of the right turn, so that the application range is small, and the safety performance is poor.
Unloading method of exemplary steering power-assisted system
Fig. 1 is a schematic flow chart illustrating a method for unloading a power steering system according to some embodiments of the present disclosure. Referring to fig. 1, the unloading method of the power steering system includes:
s100, acquiring a left-turning hydraulic value in a left-turning oil way to know the strength of hydraulic pressure in the left-turning oil way;
step S110, acquiring a right-turn hydraulic pressure value in a right-turn oil way to know the strength of the hydraulic pressure in the right-turn oil way;
step S200, comparing the left-turning hydraulic value with the right-turning hydraulic value to obtain a pressure difference value so as to know the pressure difference between the left-turning oil way and the right-turning oil way;
step S210, comparing the pressure difference value with a hydraulic rated value and correspondingly adjusting a left-turn hydraulic value or a right-turn hydraulic value to realize unloading;
the left-turning oil way is an oil way through which oil flows when the vehicle turns left relative to the advancing direction; the right-turn oil way is an oil way through which oil flows when the vehicle turns right relative to the advancing direction; the vehicle steering angle generated by the left turn or the right turn is not limited in the present application, and the vehicle steering angle may be any angle between 0 degree and 180 degrees, and any angle may be unloaded by the method.
When the vehicle turns left, the oil flows to a left-turning oil way, a pressure difference value is generated by acquiring a left-turning hydraulic value and a right-turning hydraulic value and comparing the left-turning hydraulic value and the right-turning hydraulic value, the pressure difference value is compared with a hydraulic rated value, and the left-turning hydraulic value is adjusted according to a comparison result to realize unloading of the left-turning oil way; when the vehicle turns right, unloading is carried out on the right-turning oil way, the unloading principle is the same as that of the left-turning oil way, and the unloading principle is not repeated. Therefore, hydraulic pressure unloading at any angle in the left-turn or right-turn process of the vehicle is realized, the hydraulic pressure is prevented from being higher in the steering process of the vehicle, and the steering safety of the vehicle is improved.
Fig. 2 is a schematic flow chart illustrating a process of adjusting a left-turn hydraulic pressure value or a right-turn hydraulic pressure value to achieve unloading by comparing a pressure difference value with a hydraulic rated value according to some embodiments of the present disclosure. Referring to fig. 2, comparing the pressure difference value with the hydraulic rated value and correspondingly adjusting the left-turn hydraulic value or the right-turn hydraulic value to achieve unloading specifically includes:
step S211, when the pressure difference value is larger than the hydraulic rated value, correspondingly adjusting the left-turn hydraulic value to realize unloading of the left-turn oil way, or correspondingly adjusting the right-turn hydraulic value to realize unloading of the right-turn oil way;
and step S212, when the pressure difference value is smaller than or equal to the hydraulic rated value, stopping adjusting the left-turning hydraulic pressure value or the right-turning hydraulic pressure value.
The hydraulic nominal value may be a specific value or may be a range value, and when the hydraulic nominal value is a range value, the pressure difference value may be considered to be less than the hydraulic nominal value when the pressure difference value is between the range values or less than the minimum value of the range values.
FIG. 3 is a schematic diagram illustrating a hydraulic unloading process when the pressure difference is greater than the hydraulic rated value according to some embodiments of the present disclosure. Referring to fig. 3, in some embodiments of the present application, in step S211, when the pressure difference is greater than the hydraulic rated value, the adjusting the left-turn hydraulic value correspondingly to achieve unloading of the left-turn oil path, or the adjusting the right-turn hydraulic value correspondingly to achieve unloading of the right-turn oil path specifically includes:
s2111, when the left-turn hydraulic value is greater than the right-turn hydraulic value to generate a pressure difference value, the oil in the left-turn oil way flows into the right-turn oil way to realize unloading of the left-turn oil way;
s2112, when the right-turn hydraulic value is greater than the left-turn hydraulic value to generate a pressure difference value, the oil in the right-turn oil way flows into the left-turn oil way to achieve unloading of the right-turn oil way.
When the hydraulic pressure in the left-turn oil way is greater than the hydraulic pressure in the right-turn oil way, the oil in the left-turn oil way gradually flows into the right-turn oil way, so that the flow of the oil in the left-turn oil way is reduced, the left-turn hydraulic value in the left-turn oil way is reduced, and the unloading of the left-turn oil way is smoothly completed; when the hydraulic pressure in the right-turn oil passage is greater than the hydraulic pressure in the left-turn oil passage, the unloading method of the right-turn oil passage is the same as that of the left-turn oil passage, and the description is omitted here.
Referring to fig. 1, in some embodiments of the present application, a method of unloading a steering assist system further includes:
and S213, controlling the input amount of the oil in the steering system when the pressure difference value is larger than the hydraulic rated value.
When the vehicle is in steering, when the pressure difference value is larger than a hydraulic rated value, the flow of the oil entering the corresponding left-turn oil way or right-turn oil way is limited by controlling the input quantity of the oil in the steering system, so that the unloading effect on the left-turn oil way or right-turn oil way is further improved.
Exemplary steering Power-assisted System
The embodiment of the application also provides a power steering system, which is used for implementing the unloading method of the power steering system in any one of the embodiments.
FIG. 4 is a hydraulic schematic of a steering assist system according to some embodiments of the present disclosure. FIG. 5 is a schematic diagram of a power cylinder according to some embodiments of the present disclosure. Referring to fig. 4 and 5, the steering assist system includes: the hydraulic control system comprises a power cylinder 300, a left-turning oil path 400, a right-turning oil path 500, a detection assembly 600, a control part 700 and an unloading assembly 800. The power cylinder 300 has a left-turn oil inlet 310 and a right-turn oil inlet 320, the left-turn oil path 400 is connected to the left-turn oil inlet 310, and the right-turn oil path 500 is connected to the right-turn oil inlet 320.
Referring to fig. 4, the sensing assembly 600 is configured to acquire a left-turn hydraulic pressure value in the left-turn oil passage 400, and simultaneously acquire a right-turn hydraulic pressure value in the right-turn oil passage 500. The control part 700 is connected with the detection assembly 600 in a communication way to compare the left-turning hydraulic pressure value with the right-turning hydraulic pressure value to generate a pressure difference value, and the pressure difference value is compared with a hydraulic rated value to obtain and output a control signal. The unloading assembly 800 is in communication connection with the control part 700 to obtain a control signal, the unloading assembly 800 is respectively connected with the left-turn oil passage 400 and the right-turn oil passage 500, and the unloading assembly 800 is configured to adjust a left-turn hydraulic value according to the control signal to realize unloading of the left-turn oil passage 400 or adjust a right-turn hydraulic value to realize unloading of the right-turn oil passage 500.
When the vehicle turns left in the running process, oil enters the power cylinder 300 through the left-turning oil passage 400 and the left-turning oil inlet 310, and the power cylinder 300 generates power by using the hydraulic pressure of the oil to assist the left turning of the vehicle. When the vehicle turns left, the detection assembly 600 obtains a left-turning hydraulic pressure value in the left-turning oil passage 400 and a right-turning hydraulic pressure value in the right-turning oil passage 500, and transmits the left-turning hydraulic pressure value and the right-turning hydraulic pressure value to the control part 700, the control part 700 compares the left-turning hydraulic pressure value with the right-turning hydraulic pressure value to generate a pressure difference value, compares the pressure difference value with a hydraulic rated value to obtain and output a control signal, and the unloading assembly 800 receives the control signal output by the control part 700 and correspondingly adjusts the left-turning hydraulic pressure value according to the control signal to unload the left-turning oil passage 400.
The unloading principle of the right-turn oil passage 500 is the same as that of the left-turn oil passage 400 when the vehicle turns right, and the unloading principle is not described herein again. Therefore, unloading of the vehicle at any angle during left-hand turning or right-hand turning is realized, and the steering safety of the vehicle is improved.
FIG. 6 is a schematic cross-sectional view of a load relieving assembly of a power cylinder according to some embodiments of the present disclosure. Fig. 7 shows an enlarged view of the portion a in the implementation shown in fig. 6. Referring to fig. 6 and 7, in some embodiments of the present application, a power cylinder 300 includes a cylinder body 330 and a piston 340. An oil chamber is formed in the cylinder block 330, the piston 340 is slidably connected in the oil chamber, the piston 340 divides the oil chamber into a left-turn oil chamber 350 and a right-turn oil chamber 360, the left-turn oil chamber 350 is communicated with the left-turn oil chamber 400 through the left-turn oil inlet 310, and the right-turn oil chamber 360 is communicated with the right-turn oil chamber 360 through the right-turn oil inlet 320. Wherein, unloading assembly 800 is disposed in piston 340 to unidirectionally communicate or block right-turn oil chamber 360 and left-turn oil chamber 350.
When the vehicle turns left, oil enters the left-turning oil chamber 350 through the left-turning oil passage 400, the hydraulic pressure in the left-turning oil chamber 350 is increased to push the piston 340 to move in the oil chamber, and the piston 340 generates corresponding steering auxiliary power when moving. When the left-turn oil way 400 needs to be unloaded, the unloading assembly 800 unidirectionally conducts the left-turn oil chamber 350 and the right-turn oil chamber 360 according to a control signal, and oil in the left-turn oil chamber 350 enters the right-turn oil chamber 360, so that the left-turn hydraulic value in the left-turn oil way 400 is smoothly reduced to realize unloading of the left-turn oil way 400; the unloading principle of the right-turn oil passage 500 when the vehicle turns right is similar to that of the left-turn oil passage 400, and the description thereof is omitted.
Referring to fig. 4 and 7, in some embodiments of the present application, the unloader assembly 800 includes a left-turn one-way unloader valve 810 and a right-turn one-way unloader valve 820. The piston 340 has a left through-hole 341 and a right through-hole 342. The left-turn one-way unloading valve 810 is disposed in the left through hole 341, and the left-turn one-way unloading valve 810 is in communication connection with the control portion 700 to unidirectionally conduct or block the left-turn oil chamber 350 and the right-turn oil chamber 360 according to a control signal. A right-turn one-way unloading valve 820 is disposed in the right through hole 342, and the right-turn one-way unloading valve 820 is in communication connection with the control portion 700 to unidirectionally conduct or block the right-turn oil chamber 360 and the left-turn oil chamber 350 according to a control signal. Wherein, the left-turn one-way unloading valve 810 and the right-turn one-way unloading valve are reversely mounted.
When the hydraulic pressure of the left-turn oil passage 400 needs to be unloaded, the control part 700 inputs a control signal to the left-turn one-way unloading valve 810, and the left-turn one-way unloading valve 810 conducts the left-turn oil chamber 350 and the right-turn oil chamber 360 in a one-way manner, so that only the oil in the left-turn oil chamber 350 is allowed to flow into the right-turn oil chamber 360, and meanwhile, the right-turn one-way unloading valve 820 keeps a closed state; when the hydraulic pressure of the right-turn oil passage 500 needs to be unloaded, the control part 700 inputs a control signal to the right-turn one-way unloading valve 820, and the right-turn one-way unloading valve 820 unidirectionally conducts the right-turn oil chamber 360 and the left-turn oil chamber 350, so that only the oil in the right-turn oil chamber 360 is allowed to flow in the left-turn oil chamber 350, and the left-turn one-way unloading valve 810 is kept in a closed state.
Referring to fig. 7, in some embodiments of the present disclosure, the left-turn unidirectional unloading valve 810 and the right-turn unidirectional unloading valve 820 are both disposed in the piston 340 through a threaded connection, and the threaded connection can effectively close a gap between the left-turn unidirectional unloading valve 810 and the left through hole 341 and a gap between the right-turn unidirectional unloading valve 820 and the right through hole 342, so as to maintain the sealing performance of the left through hole 341 and the right through hole 342; in other embodiments, the left-turn unidirectional unloading valve 810 can also be directly placed in the left through hole 341 and then sealed by sealing glue or the like.
In some embodiments of the present application, the unloader assembly 800 can also be implemented as a single integral bi-directional pressure unloader valve or other type of pressure unloader valve having a one-way port or shut off left-turn oil chamber 350 and oil chamber.
In some embodiments of the present application, the detection assembly 600 includes a left turn detection portion 610 and a right turn detection portion 620. The left-turn detecting part 610 is connected to the left-turn oil passage 400 to detect a left-turn hydraulic pressure value in the left-turn oil passage 400, and the left-turn detecting part 610 is in communication connection with the control part 700 to transmit the left-turn hydraulic pressure value to the control part 700. The right-turn detecting part 620 is connected to the right-turn oil passage 500 to detect a right-turn hydraulic pressure value of the right-turn oil passage 500, and the right-turn detecting part 620 is communicatively connected to the control part 700 to transmit the right-turn hydraulic pressure value to the control part 700.
In some embodiments of the present application, the left-turn detecting portion 610 and the right-turn detecting portion 620 may both employ pressure sensors.
Referring to fig. 4, in some embodiments of the present disclosure, the steering oil pump 940 is communicatively connected to the control unit 700 to receive a control signal output by the control unit 700, and the steering oil pump 940 is configured to adjust a displacement of oil supplied to the steering system according to the control signal.
When the pressure difference is greater than the hydraulic rated value, the control unit 700 controls the displacement of the steering oil pump 940, so that the flow rate of the oil input to the steering system is limited, thereby improving the unloading effect on the left-turn oil passage 400 or the right-turn oil passage 500.
Exemplary work machine
The embodiment of the application also provides engineering machinery.
Fig. 8 shows a schematic view of a construction machine according to some embodiments of the present application. Referring to fig. 4 and 8, the construction machine includes wheels, a power steering system described in any of the above embodiments, and a steering mechanism 900. The steering mechanism 900 is connected to the wheels and the steering assist system, and the steering mechanism 900 is configured to cooperate with the steering assist system to drive the corresponding wheels to rotate so as to steer the vehicle.
When the engineering machinery needs to steer in the operation process, the steering mechanism 900 and the steering power-assisted system are utilized to transmit steering power to the corresponding wheels, so that the corresponding wheels are driven to synchronously rotate, and the steering of the engineering machinery is smoothly realized.
Since the above-mentioned engineering machine is provided with the above-mentioned steering assist system, the above-mentioned engineering machine has all the technical effects of the above-mentioned steering assist system, and will not be described herein again.
The engineering machinery can be a road roller, a land leveler, a milling machine or a paver, and can also be other engineering machinery needing to be steered in the operation process, and the application does not limit the types of the engineering machinery.
In some embodiments of the present application, the wheels include two first-axle wheels 910 and two second-axle wheels 920, the steering mechanism 900 may be disposed adjacent to the first-axle wheels 910 to directly drive the first-axle wheels 910 to rotate, and the steering assistance system may be disposed adjacent to the second-axle wheels 920 to provide auxiliary steering power for the rotation of the second-axle wheels 920.
The steering mechanism 900 includes a steering oil tank 930, a steering oil pump 940, a power steering gear 950, and a transmission assembly 960. The steering oil tank 930 is used for storing oil, an oil outlet and an oil return port are formed in the steering oil tank 930, the steering oil pump 940 is provided with an oil pumping port and an oil delivery port, the oil pumping port of the steering oil pump 940 is communicated with the oil outlet of the steering oil tank 930, and the steering oil pump 940 is connected with an engine of an engineering machine. The power steering gear 950 has an oil inlet, a left-turn oil outlet, a right-turn oil outlet, and an oil drain. An oil delivery port of the steering oil pump 940 is communicated with an oil inlet of the power steering gear 950, and an oil discharge port of the power steering gear 950 is communicated with an oil return port of the steering oil tank 930. The end of the left-turn oil path 400 far away from the left-turn oil inlet 310 is communicated with a left-turn oil outlet, and the end of the right-turn oil path 500 far away from the right-turn oil inlet 320 is communicated with a right-turn oil outlet.
Referring to fig. 8, the power steering gear 950 further has an output end for outputting steering power, a transmission assembly 960 is connected to the output end of the power steering gear to obtain the steering power, the transmission assembly 960 is respectively connected to the first and second axle wheels 910 and 920, an end wall of the piston 340 of the power steering gear having the piston rod 343 extends out of the oil chamber and is connected to the transmission assembly 960, and the transmission assembly 960 is configured to transmit the steering power of the power steering gear 950 and the power steering gear to the wheels.
When the engineering machinery needs to turn left, the steering oil pump 940 pumps the oil in the steering oil tank 930 and inputs the oil into the power steering gear 950, the power steering gear 950 outputs steering power through an output end, and the steering power transmits power to wheels through the transmission assembly 960; meanwhile, the oil entering the power steering gear 950 enters the left-turn oil passage 400 and then enters the left-turn oil chamber 350 through the left-turn oil passage 400, the hydraulic pressure in the left-turn oil chamber 350 is increased to push the piston 340 to move, the piston 340 pulls the piston rod 343 to move to generate left-turn auxiliary power, and the piston rod 343 pulls the transmission assembly 960 to rotate when moving, so that the left-turn auxiliary power is smoothly provided. The oil flowing into the power steering gear 950 flows to the steering oil tank 930 through the oil discharge port to circulate the oil. When the engineering machinery needs to turn right, the principle is the same as that when the engineering machinery turns left, and the description is omitted here.
In some embodiments of the present application, the power steering gear 950 has a pressure unloading valve therein, and when the hydraulic pressure is higher during the steering process, the pressure unloading valve can actively adjust the hydraulic pressure to realize unloading, so as to ensure the safety of the steering system. Meanwhile, the pressure unloading valve in the power steering gear 950 may operate simultaneously with the unloading assembly 800 in the power cylinder 300 to improve the unloading effect. When the pressure unloading valve in the power steering gear 950 fails, the unloading assembly 800 in the power cylinder 300 connected in parallel with the power steering gear 950 can continue to operate the unloading function to ensure that the pressure in the steering system is normal. Thereby further improving the safety of the vehicle steering.
In some embodiments of the present application, the steering oil pump 940 may be an electrically controlled variable oil pump.
Referring to FIG. 8, in some embodiments of the present application, the transmission assembly 960 includes a steering hammer arm 961, a steering drag link 962, a steering rocker 963, a one-axle drag link 964, and a two-axle drag link 965. One end of an axle drag link 964 is connected to the power steering gear 950, and the other end of the axle drag link 964 is connected to an axle wheel 910.
The steering hammer arm 961 is connected with the power steering gear 950, one end of the steering hammer arm 961, which is far away from the power steering gear 950, is connected with the steering drag link 962, one end of the steering drag link 962, which is far away from the steering hammer arm 961, is connected with the steering rocker arm 963, one end of the steering rocker arm 963, which is far away from the steering drag link 962, is connected with the piston rod 343, one end of the second axle drag link 965 is connected with the steering rocker arm 963, and the other end of the second axle drag link 965 is connected with the second axle wheel 920.
When the power steering gear 950 outputs steering power, the steering power is directly transmitted to the first axle wheels 910 through the first axle drag link 964, and simultaneously the steering power is transmitted to the second axle wheels 920 through the steering hammer arm 961, the steering drag link 962, the steering rocker 963 and the second axle drag link 965, and simultaneously the piston rod 343 is correspondingly changed, so that the steering rocker 963 and the second axle drag link 965 are directly driven to rotate, the steering power is rapidly transmitted to the second axle wheels 920, and the synchronism of the second axle wheels 920 and the first axle wheels 910 is improved.
Referring to fig. 4, in some embodiments of the present invention, a heat dissipation pipe 966 is directly disposed at an oil return port of the steering oil tank 930 and an oil discharge port of the power steering gear 950, and oil discharged from the oil discharge port of the power steering gear 950 flows through the heat dissipation pipe 966 to dissipate heat and then flows back into the steering oil tank 930 through the oil return port, so as to reduce the possibility of temperature increase of the oil. A filter 967 may be disposed between the steering oil tank 930 and the steering oil pump 940 to filter oil leaving the steering oil tank 930.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.
Claims (5)
1. A steering assist system, characterized by comprising:
a booster cylinder;
the left-turning oil way is connected with the power-assisted oil cylinder;
the right-turning oil way is connected with the power-assisted oil cylinder;
a detection assembly configured to acquire a left turn hydraulic value in the left turn oil passage and acquire a right turn hydraulic value in the right turn oil passage;
the control part is in communication connection with the detection assembly to acquire the left-turn hydraulic pressure value and the right-turn hydraulic pressure value detected by the detection assembly, compare the left-turn hydraulic pressure value and the right-turn hydraulic pressure value to acquire a pressure difference value, compare the pressure difference value with a hydraulic rated value to acquire and output a control signal;
an unloading assembly connected with the left-turn oil passage, the unloading assembly being connected with the right-turn oil passage, the unloading assembly being in communication connection with the control portion to receive the control signal output by the control portion, the unloading assembly being configured to adjust the left-turn hydraulic value or the right-turn hydraulic value according to the control signal;
the power cylinder includes:
a cylinder body having an oil chamber therein;
the piston is connected in the oil cavity in a sliding mode, the piston divides the oil cavity into a left-turning oil cavity and a right-turning oil cavity, the left-turning oil cavity is communicated with the left-turning oil way, and the right-turning oil cavity is communicated with the right-turning oil way;
the unloading assembly is arranged in the piston to conduct or separate the right-turn oil cavity and the left-turn oil cavity in a single direction;
wherein the unloader assembly comprises:
the piston is provided with a left through hole, the left-turning one-way unloading valve is arranged in the left through hole, and the left-turning one-way unloading valve is in communication connection with the control part so as to unidirectionally conduct or separate the left-turning oil cavity and the right-turning oil cavity according to the control signal output by the control part;
the piston is provided with a right through hole, the right-turning one-way unloading valve is arranged in the right through hole, and the right-turning one-way unloading valve is in communication connection with the control part so as to conduct or separate the right-turning oil cavity and the left-turning oil cavity according to the control signal output by the control part;
the left-turn one-way unloading valve and the right-turn one-way unloading valve are reversely mounted.
2. The steering assist system of claim 1, wherein the detection assembly comprises:
a left-turn detection section provided on the left-turn oil passage to acquire the left-turn hydraulic pressure value;
and a right-turn detection portion that is provided on the right-turn oil passage to acquire the right-turn hydraulic pressure value.
3. The power steering system of claim 1, wherein the control portion is communicatively coupled to a steering oil pump configured to regulate a displacement of the input oil to the steering system based on the control signal output by the control portion.
4. A work machine, characterized in that the work machine comprises:
a wheel;
the steering assist system according to any one of claims 1 to 3;
the steering mechanism is respectively connected with the wheels and the power steering system, and is configured to be matched with the power steering system to drive the corresponding wheels to synchronously rotate so as to realize steering.
5. The work machine of claim 4, wherein the steering mechanism comprises:
a steering oil tank;
the steering oil pump is provided with an oil pumping port and an oil delivery port, and the oil pumping port is connected with the steering oil tank;
the power steering gear is provided with an oil inlet, a left-turning oil outlet, a right-turning oil outlet and an output end, the oil inlet is communicated with the oil delivery port, the left-turning oil way is communicated with the left-turning oil outlet, the right-turning oil way is communicated with the right-turning oil outlet, and the power steering gear is provided with a pressure unloading valve for unloading hydraulic pressure in the power steering gear;
and the transmission assembly is connected with the wheels so as to transmit the steering power of the power steering gear and the steering power-assisted system to the wheels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110656296.2A CN113212548B (en) | 2021-06-11 | 2021-06-11 | Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110656296.2A CN113212548B (en) | 2021-06-11 | 2021-06-11 | Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113212548A CN113212548A (en) | 2021-08-06 |
| CN113212548B true CN113212548B (en) | 2022-08-02 |
Family
ID=77081528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110656296.2A Active CN113212548B (en) | 2021-06-11 | 2021-06-11 | Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113212548B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2594088Y (en) * | 2003-01-07 | 2003-12-24 | 重庆重型汽车集团有限责任公司 | Safety protector for hydraulic booster vehicle steering system |
| CN1789056A (en) * | 2005-12-27 | 2006-06-21 | 江苏罡阳股份有限公司 | Built-in positioning unloading device of automobile power steering gear |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1379606A (en) * | 1970-12-29 | 1975-01-02 | Nissan Motor | Power-assisted steering system |
| CN102069844B (en) * | 2010-12-30 | 2012-09-05 | 杭州世宝汽车方向机有限公司 | Rack-and-pinion hydraulic power steering gear with pressure relief device |
| CN102303642A (en) * | 2011-06-20 | 2012-01-04 | 上海华普汽车有限公司 | Hydraulic power-assisted steering system with adjustable assisted power and power-assisted steering control method thereof |
| CN110745182A (en) * | 2019-10-21 | 2020-02-04 | 三一汽车起重机械有限公司 | Auxiliary steering control system and crane |
| CN110748517B (en) * | 2019-10-30 | 2021-10-29 | 上海三一重机股份有限公司 | Hydraulic control system of rotary motor, overload unloading method and construction vehicle |
| CN111731378A (en) * | 2020-06-16 | 2020-10-02 | 东风商用车有限公司 | Steering power-assisted cylinder assembly with stroke unloading valve |
-
2021
- 2021-06-11 CN CN202110656296.2A patent/CN113212548B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2594088Y (en) * | 2003-01-07 | 2003-12-24 | 重庆重型汽车集团有限责任公司 | Safety protector for hydraulic booster vehicle steering system |
| CN1789056A (en) * | 2005-12-27 | 2006-06-21 | 江苏罡阳股份有限公司 | Built-in positioning unloading device of automobile power steering gear |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113212548A (en) | 2021-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10759471B2 (en) | Power steering device | |
| US9511796B2 (en) | Power steering system | |
| JP4941651B2 (en) | Steering device | |
| US5941338A (en) | Vehicle steering correction system | |
| US9038763B2 (en) | Hydraulic power steering system | |
| WO2016132854A1 (en) | Power steering device | |
| US20120199411A1 (en) | Variable displacement pump | |
| JP4115156B2 (en) | Power steering system control method | |
| US20110282551A1 (en) | Power steering apparatus | |
| JP5772294B2 (en) | Power steering device | |
| JPH0616145A (en) | Hydrostatic power steering device | |
| JP4485802B2 (en) | Hydraulic servo steering device | |
| JP2004210237A (en) | Power steering device | |
| CN113212548B (en) | Unloading method of steering power-assisted system, steering power-assisted system and engineering machinery | |
| US20070144820A1 (en) | Power steering apparatus | |
| US20030193238A1 (en) | Hydraulic booster brake system | |
| US20090125191A1 (en) | Power Steering Apparatus | |
| US8312958B1 (en) | Power steering systems and methods | |
| JP2007506604A5 (en) | ||
| US9995387B2 (en) | Hydrostatic traction drive system | |
| JP6346406B6 (en) | Hydraulic power steering system, vehicle equipped with the same, and control method for the hydraulic power steering system | |
| JP2008213669A (en) | Steering device | |
| JP2779008B2 (en) | Power steering control device | |
| JPH0424169A (en) | Power steering device | |
| JP2528353B2 (en) | Power steering system used in automobiles |
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 | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20210806 Assignee: Sany Automobile Manufacturing Co.,Ltd. Assignor: SANY SPECIAL PURPOSE VEHICLE Co.,Ltd. Contract record no.: X2024980010904 Denomination of invention: A method for unloading a power steering system, a power steering system, and construction machinery Granted publication date: 20220802 License type: Common License Record date: 20240801 |
|
| EE01 | Entry into force of recordation of patent licensing contract |