CN218558952U - Low-load starting system for aircraft tractor - Google Patents
Low-load starting system for aircraft tractor Download PDFInfo
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- CN218558952U CN218558952U CN202223274136.0U CN202223274136U CN218558952U CN 218558952 U CN218558952 U CN 218558952U CN 202223274136 U CN202223274136 U CN 202223274136U CN 218558952 U CN218558952 U CN 218558952U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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Abstract
The utility model discloses a low-load starting system for an aircraft tractor, the hydraulic control system comprises a hydraulic pump, a cooling system based on a hydraulic motor, front and rear wheel steering oil cylinders, a three-position four-way electromagnetic valve, a full hydraulic steering gear, a PLC (programmable logic controller), a pressure release valve and an angle sensor; the full hydraulic steering gear is provided with a steering oil inlet, a steering gear oil return port and two distribution ports which correspondingly carry out oil supply and oil return state conversion along with the change of the rotating direction of a vehicle steering wheel, forms three oil ways with the steering oil cylinders of front and rear wheels by means of the two distribution ports and the three-position four-way electromagnetic valve, and leads the vehicle to form three steering modes by the controller; and a bypass overflow valve is arranged on an oil way of the hydraulic motor through a bypass. The beneficial effects of the utility model are that, through establishing the bypass overflow valve on hydraulic motor's oil circuit to and establish the low-load on the main oil circuit and start the solenoid valve. The bypass overflow valve and the low-load starting electromagnetic valve are used for shunting, so that the load of the hydraulic pump is reduced, and the smooth starting of the system is facilitated.
Description
Technical Field
The utility model relates to a vehicle control system that traveles, especially a low-load starting system for aircraft tractor.
Background
The aircraft tractor is a special vehicle for tracting aircraft in airport, and its steering control usually adopts hydraulic steering because of large tonnage and large traction power, and in the steering process, the direction is controlled by means of steering wheel, and the hydraulic steering device is used for providing hydraulic oil circuit conversion so as to implement steering. In order to meet different working conditions of the vehicle, multiple working modes such as front wheel steering, four-wheel steering and crab steering are required. In an internal combustion type vehicle system, an engine cannot enter an idling state all the time due to overlarge starting load, and one method for solving the problem is to increase the fuel injection quantity of the starting idling, but the method can increase emission and fuel consumption, and the problem of difficult starting due to overlarge starting load can cause damage to the starter, so that the starting load needs to be reduced. When using hydraulic system in the new forms of energy vehicle, because the motor drives the hydraulic pump and starts, if the start load is too big, can cause motor controller electric current too big and appear overcurrent protection, motor overload and lead to life to shorten etc. consequently, at the start-up stage, also need reduce the start load, make the motor start steadily. For airport tractors, the steering system oil circuit is the main load of the hydraulic pump, and the starting load of the hydraulic pump can be reduced through a special starting oil circuit. However, in the conventional four-wheel drive system, even if a special oil passage is used to reduce the start load of the main pump, the heat dissipation system operated by the hydraulic motor is still in a rated load operating state, and there is a room for further reducing the load. For this reason, further improvement is required.
Disclosure of Invention
The utility model aims at providing a defect that the effect is not significant is subtracted to current four wheel actuating system's for aircraft tractor low-load starting system, provides an aircraft tractor low-load starting system, and this system is through setting up the bypass on hydraulic motor's cooling system's oil circuit to make cooling system be in low-load operating condition through the bypass reposition of redundant personnel, thereby hoist system subtract the burden effect.
In order to achieve the above purpose, the present invention adopts the following technical solution.
A low-load starting system for an aircraft tractor comprises a hydraulic pump, a heat dissipation system based on a hydraulic motor, steering oil cylinders of front and rear wheels, a steering mode switching electromagnetic valve with a three-position four-way structure, a full-hydraulic steering gear, a pressure release valve and a controller, wherein the pressure release valve and the controller are used for relieving the pressure of an oil path of the steering system, and a sensor used for providing wheel position signals; the controller is respectively electrically connected with the steering mode switching electromagnetic valve, the full hydraulic steering gear and the sensor, the full hydraulic steering gear is provided with a steering oil inlet, a steering gear oil return port and two steering distribution ports which correspondingly carry out oil supply and oil return state conversion along with the change of the rotating direction of a vehicle steering wheel, the full hydraulic steering gear forms three oil paths with the steering oil cylinders of front and rear wheels by means of the two steering distribution ports and the steering mode switching electromagnetic valve with a three-position four-way structure, and the vehicle forms three steering modes through the controller; on the oil path of the hydraulic motor a bypass overflow valve is arranged through a bypass.
By adopting the technical proposal, the utility model comprises a front wheel steering oil cylinder, a rear wheel steering oil cylinder, a three-position four-way electromagnetic valve, a full hydraulic steering gear and a controller, and a bypass overflow valve is arranged on an oil path of a hydraulic motor in the steering system formed by the sensor for providing the wheel position signal through a bypass. When the hydraulic pump is started, the hydraulic oil flow entering the hydraulic motor is divided through the bypass overflow valve, and the hydraulic motor of the heat dissipation system is in a low-rotating-speed running state based on the backpressure of the bypass overflow valve, so that the load of the hydraulic pump is reduced, the load reduction effect is improved, and the smooth starting of the system is facilitated. In the case of a tractor for an internal combustion engine, the hidden troubles that the starting motor is damaged due to overlarge starting load and emission is increased due to the fact that the starting motor cannot enter an idling state for a long time can be eliminated; for a vehicle powered by new energy, the overcurrent protection of a motor controller due to abnormal or overlarge current can be eliminated, and the hidden danger that the overload of the motor affects the service life can also be eliminated.
Preferably, the hydraulic steering system further comprises a bidirectional proportional solenoid valve and a low-load starting solenoid valve which is electrically connected with the controller and is in a three-position four-way valve structure, wherein the bidirectional proportional solenoid valve is electrically connected with the controller and is connected between two steering distribution ports of the full hydraulic steering device; the low-load starting electromagnetic valve is connected with the full-hydraulic steering gear in parallel, and the low-load starting electromagnetic valve and the full-hydraulic steering gear form a working mode. The low-load starting electromagnetic valve is connected with the full hydraulic steering gear in parallel, the bidirectional proportional electromagnetic valve is arranged between two steering distribution ports of the full hydraulic steering gear, so that the low-load starting electromagnetic valve and the bidirectional proportional electromagnetic valve are utilized in the system starting stage, the back pressure of the system can be gradually increased by adjusting the opening of the bidirectional proportional electromagnetic valve, and a low-load oil return loop is formed by utilizing a loop of the system, so that the load of a steering main oil way is reduced, and the aim of low-load starting is fulfilled. The bidirectional proportional solenoid valve is also used for realizing shunting through opening degree adjustment in the steering process, so that the degree of association between the steering wheel and the steering flow is reduced, and the problem of repeated aligning operation caused by excessive aligning due to overhigh degree of association between the steering wheel and the steering flow is solved. The low-load starting electromagnetic valve adopting a three-position four-way valve structure is matched with a two-way proportional electromagnetic valve and a one-key aligning key, and when the sensor adopts an angle sensor, the one-key aligning function of wheel alignment can be realized by a controller based on the existing industrial control technology.
Further preferably, the low-load starting electromagnetic valve comprises a starting oil inlet, a starting oil return port and two starting distribution ports, the starting oil inlet is communicated with the steering oil inlet, and the starting oil return port is connected with the oil return tank; the two starting distribution ports are respectively communicated with the two steering distribution ports of the full hydraulic steering gear. So that the low-load starting electromagnetic valve and the full hydraulic steering gear form a reliable parallel connection and alternative working relation.
Further preferably, the hydraulic steering gear further comprises a hydraulic lock, wherein a hydraulic lock oil inlet and a hydraulic lock oil return port of the hydraulic lock are respectively communicated with the two starting distribution ports, and the two hydraulic lock distribution ports of the hydraulic lock are respectively communicated with the two steering distribution ports of the full-hydraulic steering gear. The hydraulic lock is used for ensuring the reliability of the cut-off state of the low-load starting electromagnetic valve, avoiding the phenomenon that hydraulic oil returns to the oil tank through the low-load starting electromagnetic valve due to the accidental fault of the low-load starting electromagnetic valve in the steering process of the full hydraulic steering gear, and ensuring the steering reliability.
Still further preferably, the steering mode switching solenoid valve, the low-load starting solenoid valve and the hydraulic lock are integrated on an integrated hydraulic module, and the integrated hydraulic module is provided with an integrated oil inlet, an integrated oil return port, a first integrated distribution port, a second integrated distribution port, a third integrated distribution port, a first integrated interface, a second integrated interface and an integrated oil supply port; the integrated oil supply port is communicated with the integrated oil inlet through a one-way valve; the integrated oil return port is connected with an oil return tank, the integrated oil return port is communicated with a starting oil return port of the low-load starting electromagnetic valve, and a starting oil inlet of the low-load starting electromagnetic valve is communicated with the integrated oil supply port inside the integrated hydraulic module; a first hydraulic lock distribution port of the hydraulic lock is communicated with the first integrated interface, the first integrated interface is also communicated with a switching oil return port of the steering mode switching electromagnetic valve, and a switching oil inlet of the steering mode switching electromagnetic valve is communicated with the second integrated interface; in the two switching distribution ports of the steering mode switching solenoid valve, the first switching distribution port is communicated with the first integrated distribution port, and the second switching distribution port is communicated with the second integrated distribution port; and a second hydraulic lock distribution port of the hydraulic lock is communicated with a third integrated distribution port. By integrating the steering mode switching solenoid valve, the low load start solenoid valve and the hydraulic lock on the integrated hydraulic module, an integrated structure is formed, the structure is compact, and the layout of a hydraulic system is convenient.
Still further preferably, the pressure relief valve is also integrated on the integrated hydraulic module, and the pressure relief valve is connected between the front-end oil path of the check valve and the integrated oil return port. The pressure of hydraulic oil entering the integrated hydraulic module is controlled by arranging the pressure relief valve, so that the total pressure of the system is limited, the steering main oil way, the oil cylinder and related hydraulic elements are ensured to work under allowable pressure, and the safety of the system is ensured.
Still further preferably, the integrated hydraulic module further includes a standby interface, and the interface is communicated with the integrated oil supply port through an internal oil path. The integrated oil supply port is prevented from being accidentally damaged and then quickly restored to supply oil to the full-hydraulic steering gear through the standby interface, so that the failure outage rate is reduced, and the use efficiency of equipment is improved.
Still further preferably, the front and rear wheel steering cylinders are composed of a front wheel steering cylinder and a rear wheel steering cylinder; the left oil cavity of the front wheel steering oil cylinder is communicated with a first steering distribution port of the full hydraulic steering gear, a steering oil inlet of the full hydraulic steering gear is connected with an integrated oil supply port, and an oil return port of the steering gear is connected with an oil return tank; a second steering distribution port of the full hydraulic steering gear is connected with a first integrated interface of the integrated hydraulic module, and a second integrated interface of the integrated hydraulic module is communicated with a right oil cavity of the front wheel steering oil cylinder; and a first integrated distribution port and a second integrated distribution port of the integrated hydraulic module are respectively communicated with a left oil chamber and a right oil chamber of the rear wheel steering oil cylinder. Therefore, a complete low-load starting system for the aircraft tractor is formed, and the low-load starting function is reliable under the condition of three steering modes.
Preferably, the hydraulic pump is a duplex hydraulic pump consisting of a main oil pump and an auxiliary oil pump, the main oil pump of the duplex hydraulic pump is connected with a steering system oil way, and the auxiliary oil pump of the duplex hydraulic pump is connected with a cooling system oil way. The duplex hydraulic pump can replace two independent hydraulic pumps, so that the structure is simplified, the occupied space is reduced, and the system arrangement is facilitated.
Preferably, a maintaining one-way valve is arranged between an oil inlet and an oil outlet of the hydraulic motor. By maintaining the one-way valve, after the hydraulic pump is stopped, the fan connected with the hydraulic motor continues to rotate under the action of inertia, the hydraulic motor rotates along with the fan, and a compression is formed at an oil inlet of the hydraulic motor.
The beneficial effects of the utility model are that, be equipped with the bypass overflow valve through the bypass on hydraulic motor's oil circuit to and set up the low-load start-up solenoid valve parallelly connected with full hydraulic steering ware on main oil circuit. When the hydraulic pump is started, the oil return tank is shunted through the bypass overflow valve and the low-load starting electromagnetic valve, so that the load of the hydraulic pump is reduced, the load reduction effect is improved, and the smooth starting of the system is facilitated.
Drawings
Fig. 1 is a block diagram showing the structure of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.
Referring to fig. 1, a low-load starting system for an aircraft tractor comprises a hydraulic pump 1, a heat dissipation system based on a hydraulic motor 10, front and rear wheel steering cylinders, a steering mode switching electromagnetic valve 3 with a three-position four-way structure, a full-hydraulic steering gear 2, a pressure release valve 5 for oil path pressure release of the steering system, a controller and a sensor for providing wheel position signals; the controller is respectively electrically connected with the steering mode switching electromagnetic valve 3, the full hydraulic steering gear 2 and the sensor, the full hydraulic steering gear 2 is provided with a steering oil inlet p, a steering gear oil return port T and two steering distribution ports which correspondingly carry out oil supply and oil return state conversion along with the change of the rotating direction of a vehicle steering wheel, the full hydraulic steering gear 2 forms three oil paths with the steering oil cylinders of front and rear wheels by means of the two steering distribution ports and the steering mode switching electromagnetic valve 3 with a three-position four-way structure, and the vehicle forms three steering modes through the controller; a bypass relief valve 9 is provided in an oil path of the hydraulic motor 10 by a bypass.
The hydraulic pump 1 is a duplex hydraulic pump consisting of a main oil pump and an auxiliary oil pump, the main oil pump of the duplex hydraulic pump is connected with a steering system oil way, and the auxiliary oil pump of the duplex hydraulic pump is connected with a cooling system oil way; a maintaining one-way valve is arranged between the oil inlet and the oil outlet of the hydraulic motor 10.
In addition, the hydraulic steering system also comprises a two-way proportional solenoid valve 6 and a low-load starting solenoid valve 4 which is electrically connected with the controller and has a three-position four-way valve structure, wherein the two-way proportional solenoid valve 6 is electrically connected with the controller, and the two-way proportional solenoid valve 6 is connected between two steering distribution ports of the full hydraulic steering device 2; the low-load starting electromagnetic valve 4 is connected with the full-hydraulic steering gear 2 in parallel, and the low-load starting electromagnetic valve 4 and the full-hydraulic steering gear 2 form a working mode. The low-load starting electromagnetic valve 4 comprises a starting oil inlet, a starting oil return port and two starting distribution ports, the starting oil inlet is communicated with the steering oil inlet p, and the starting oil return port is connected with an oil return tank; the two starting distribution ports are respectively communicated with the two steering distribution ports of the full hydraulic steering gear 2. The hydraulic steering gear further comprises a hydraulic lock 11, wherein a hydraulic lock oil inlet and a hydraulic lock oil return port of the hydraulic lock 11 are respectively communicated with the two starting distribution ports, and the two hydraulic lock distribution ports of the hydraulic lock 11 are respectively communicated with the two steering distribution ports of the full-hydraulic steering gear 2.
The steering mode switching electromagnetic valve 3, the low-load starting electromagnetic valve 4 and the hydraulic lock 11 are integrated on an integrated hydraulic module, and the integrated hydraulic module is provided with an integrated oil inlet P1, an integrated oil return port T1, a first integrated distribution port RL, a second integrated distribution port RR, a third integrated distribution port HZ, a first integrated interface TL, a second integrated interface FL and an integrated oil supply port P; the integrated oil supply port P is communicated with the integrated oil inlet P1 through a one-way valve; the integrated oil return port T1 is connected with an oil return tank, the integrated oil return port T1 is communicated with a starting oil return port of the low-load starting electromagnetic valve 4, and a starting oil inlet of the low-load starting electromagnetic valve 4 is communicated with the integrated oil supply port P in the integrated hydraulic module; a first hydraulic lock distribution port of the hydraulic lock 11 is communicated with the first integration interface TL, the first integration interface TL is further communicated with a switching oil return port of the steering mode switching electromagnetic valve 3, and a switching oil inlet of the steering mode switching electromagnetic valve 3 is communicated with the second integration interface FL; of the two switching distribution ports of the steering mode switching solenoid valve 3, the first switching distribution port is communicated with the first integrated distribution port RL, and the second switching distribution port is communicated with the second integrated distribution port RR; the second hydraulic lock distribution port of the hydraulic lock 11 is connected to the third integrated distribution port HZ. In addition, the pressure relief valve 5 is also integrated on the integrated hydraulic module, and the pressure relief valve 5 is connected between the front-end oil path of the one-way valve and the integrated oil return port T1. The integrated hydraulic module further comprises a standby interface M1, and the interface M1 is communicated with the integrated oil supply port P through an internal oil way.
The front and rear wheel steering oil cylinders consist of a front wheel steering oil cylinder 7 and a rear wheel steering oil cylinder 8; the left oil cavity of the front wheel steering oil cylinder 7 is communicated with a first steering distribution port of the full hydraulic steering gear 2, a steering oil inlet P of the full hydraulic steering gear 2 is connected with an integrated oil supply port P, and an oil return port T of the steering gear is connected back to the oil tank; a second steering distribution port of the full hydraulic steering gear 2 is connected with a first integrated interface TL of the integrated hydraulic module, and a second integrated interface FL of the integrated hydraulic module is communicated with a right oil cavity of the front wheel steering oil cylinder 7; and a first integrated distribution port RL and a second integrated distribution port RR of the integrated hydraulic module are respectively communicated with a left oil cavity and a right oil cavity of the rear wheel steering oil cylinder 8. A bidirectional proportional solenoid valve 6 is connected between the two steering distribution ports of the full hydraulic steering gear 2, and the bidirectional proportional solenoid valve 6 is electrically connected with the controller.
In this embodiment, an oil inlet P1 of the integrated hydraulic module is connected to an oil outlet of a main oil pump of the hydraulic pump 1, an oil inlet of the hydraulic pump 1 is connected to the inside of an oil tank through a filtering device, an oil outlet of the sub-oil pump is connected to an oil inlet of the hydraulic motor 10, a bypass overflow valve 9 is connected to a connection pipeline between the oil outlet of the sub-oil pump and the hydraulic motor 10, outlets of the bypass overflow valve 9 and the hydraulic motor 10 are both connected to the oil tank, and the hydraulic motor 10 forms a hydraulic heat dissipation motor through a fan blade.
In the embodiment, the opening of the bidirectional proportional electromagnetic flow regulating valve 6 is regulated by an internal electromagnetic coil YA 5; the three-position four-way electromagnetic valve 3 has a middle working state as shown in the figure, and based on the left working state of the electromagnetic coil YA1 and the right working state of the electromagnetic coil YA2, the vehicle steering modes corresponding to the three working states are a front wheel steering mode, a four wheel steering mode and a crab steering mode in sequence. The three working modes are respectively used in different working conditions, the front wheel steering mode is adopted when the normal running working conditions comprise straight running and turning traction, the crab running working mode is adopted when the transverse moving traction is carried out, and the four-wheel working mode is adopted when the pivot is rotated. Meanwhile, the four-wheel working mode and the crab walking working mode are also used for rear wheel deviation correction.
Fuel aircraft tractor hydraulic system starts explanation: the hydraulic pump of the direct engine connection piece 1 works, if the rotating speed of the engine is 0RPM, the engine is not started; if the rotating speed of the engine is 0-700RPM, the engine is in a starting stage; and if the engine speed is greater than 700RPM, the engine is started.
Description of starting a hydraulic system of the electric aircraft tractor: the motor direct connection piece 1 is used for the hydraulic pump to work, and when the rotating speed of the motor is 0RPM, the motor is not started; if the rotating speed of the motor is 0-1500RPM, the motor is in a starting stage; and if the rotating speed of the motor is more than 1500RPM, the motor is started.
In the system implementation process of the embodiment, the hydraulic pump 1 is started when the steering wheel is in the neutral position, and the specific process is as follows.
1. When a starting switch is turned to a starting gear, a controller receives the engine rotating speed or the motor rotating speed transmitted by an ECU, and instructs a hydraulic pump 1 to operate according to a starting mode based on received power source rotating speed data when a power source is in a starting stage, in the mode, an electromagnetic coil YA3 of a low-load starting electromagnetic valve 4, an electromagnetic coil YA5 of a bidirectional proportional electromagnetic valve 6 and an electromagnetic coil YA6 of a bypass overflow valve 9 are electrified, at the moment, hydraulic oil turning to a main oil way directly returns to an oil tank through an oil inlet of the P1-low-load starting electromagnetic valve 4-HZ-bidirectional proportional electromagnetic valve 6-TL-an oil inlet of the low-load starting electromagnetic valve 4 in sequence, the oil circulation of a steering system only has back pressure provided by the bidirectional proportional electromagnetic valve 6, and the main oil way is in a low-load working mode; one part of hydraulic oil of the oil circuit of the heat dissipation system passes through the bypass overflow valve 9, the other part of the hydraulic oil returns to the oil tank after passing through the hydraulic motor 10 based on the back pressure provided by the bypass overflow valve 9, and the heat dissipation oil circuit is also in a low-load working mode.
2. When the controller judges that the power source is in normal working rotating speed, the controller judges that the starting is finished, the electromagnetic coil YA3 of the low-load starting electromagnetic valve 4 and the electromagnetic coil YA5 of the bidirectional proportional electromagnetic valve 6 are powered off, and the main oil way returns to a rated load working mode.
3. The system can be in an energy-saving working mode based on a temperature sensor and a controller under the rated load working mode of the main oil way. Specifically, after the controller receives the temperature signal of the temperature sensor, when the temperature is lower than a set value, the electromagnetic coil YA6 of the bypass overflow valve 9 is electrified, and the hydraulic motor 10 works based on the back pressure provided by the bypass overflow valve 9, so that a low-load energy-saving mode is formed, and the energy consumption is reduced.
When the temperature is higher than the set value, the electromagnetic coil YA6 of the bypass overflow valve 9 is de-energized, so that the heat dissipation system recovers the rated load working mode.
The system may also provide emergency operation modes based on existing industrial control technology controllers. Specifically, when the controller senses that a temperature sensor or a vehicle speed signal is abnormal, the emergency mode is automatically entered, and at the moment, the system defaults to enter a rated load working mode. If the controller fails to cause repeated entering of the low-load working mode, the electric plug of the electromagnetic valve YA3, YA5 or YA6 can be manually unplugged, the failure can be eliminated, and the vehicle can enter the emergency working mode of the rated load.
The foregoing shows and describes the basic principles and principal features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A low-load starting system for an aircraft tractor comprises a hydraulic pump (1), a heat dissipation system based on a hydraulic motor (10), steering oil cylinders of front and rear wheels, a steering mode switching electromagnetic valve (3) with a three-position four-way structure, a full-hydraulic steering gear (2), a pressure release valve (5) and a controller, wherein the pressure release valve is used for releasing pressure of an oil way of the steering system, and a sensor used for providing wheel position signals; the controller is respectively electrically connected with the steering mode switching electromagnetic valve (3), the full hydraulic steering gear (2) and the sensor, the full hydraulic steering gear (2) is provided with a steering oil inlet (p), a steering gear oil return port (T) and two steering distribution ports which correspondingly carry out oil supply and oil return state conversion along with the change of the rotating direction of a vehicle steering wheel, the full hydraulic steering gear (2) forms three oil paths with the steering oil cylinders of front and rear wheels by means of the two steering distribution ports and the steering mode switching electromagnetic valve (3) with a three-position four-way structure, and the vehicle forms three steering modes through the controller; the hydraulic control system is characterized in that a bypass overflow valve (9) is arranged on an oil path of the hydraulic motor (10) through a bypass.
2. The low load starting system for the aircraft tractor according to claim 1, characterized by further comprising a two-way proportional solenoid valve (6), and a low load starting solenoid valve (4) electrically connected with the controller and in a three-position four-way valve structure, the two-way proportional solenoid valve (6) being electrically connected with the controller, the two-way proportional solenoid valve (6) being connected between the two steering distribution ports of the full hydraulic steering gear (2); the low-load starting electromagnetic valve (4) is connected with the full-hydraulic steering gear (2) in parallel, and the low-load starting electromagnetic valve (4) and the full-hydraulic steering gear (2) form a working mode.
3. The low-load starting system for the aircraft tractor according to claim 2, wherein the low-load starting solenoid valve (4) comprises a starting oil inlet, a starting oil return port and two starting distribution ports, the starting oil inlet is communicated with the steering oil inlet (p), and the starting oil return port is connected with an oil return tank; the two starting distribution ports are respectively communicated with the two steering distribution ports of the full hydraulic steering gear (2).
4. The low load starting system for the aircraft tractor according to claim 3, further comprising a hydraulic lock (11), wherein the hydraulic lock oil inlet and the hydraulic lock oil return port of the hydraulic lock (11) are respectively communicated with the two starting distribution ports, and the two hydraulic lock distribution ports of the hydraulic lock (11) are respectively communicated with the two steering distribution ports of the full hydraulic steering gear (2).
5. The low load starting system for aircraft tractors according to claim 4, characterized in that the steering mode switching solenoid valve (3), the low load starting solenoid valve (4) and the hydraulic lock (11) are integrated on an integrated hydraulic module, the integrated hydraulic module is provided with an integrated oil inlet (P1), an integrated oil return port (T1), a first integrated distribution port (RL), a second integrated distribution port (RR), a third integrated distribution port (HZ), a first integrated interface (TL), a second integrated interface (FL) and an integrated oil supply port (P); the integrated oil supply port (P) is communicated with the integrated oil inlet (P1) through a one-way valve; the integrated oil return port (T1) is connected with an oil return tank, the integrated oil return port (T1) is communicated with a starting oil return port of the low-load starting electromagnetic valve (4), and a starting oil inlet of the low-load starting electromagnetic valve (4) is communicated with the integrated oil supply port (P) in the integrated hydraulic module; a first hydraulic lock distribution port of the hydraulic lock (11) is communicated with the first integrated interface (TL), the first integrated interface (TL) is also communicated with a switching oil return port of the steering mode switching electromagnetic valve (3), and a switching oil inlet of the steering mode switching electromagnetic valve (3) is communicated with the second integrated interface (FL); the steering mode switching solenoid valve (3) is provided with two switching distribution ports, wherein the first switching distribution port is communicated with the first integrated distribution port (RL), and the second switching distribution port is communicated with the second integrated distribution port (RR); the second hydraulic lock distribution port of the hydraulic lock (11) is communicated with the third integrated distribution port (HZ).
6. The low load starting system for aircraft tractors according to claim 5, characterized in that the pressure relief valve (5) is also integrated in the integrated hydraulic module, the pressure relief valve (5) being connected between the front oil circuit of the one-way valve and the integrated oil return (T1).
7. The low load starting system for aircraft tractors according to claim 5, characterized in that said integrated hydraulic module further comprises a backup connection (M1), said connection (M1) being in communication with said integrated oil supply port (P) through an internal oil circuit.
8. The low load starting system for an aircraft tractor according to 5~7 wherein said front and rear wheel steering cylinders consist of a front wheel steering cylinder (7) and a rear wheel steering cylinder (8); the left oil cavity of the front wheel steering oil cylinder (7) is communicated with a first steering distribution port of the full hydraulic steering gear (2), a steering oil inlet (P) of the full hydraulic steering gear (2) is connected with an integrated oil supply port (P), and an oil return port (T) of the steering gear is connected back to the oil tank; a second steering distribution port of the full hydraulic steering gear (2) is connected with a first integrated interface (TL) of the integrated hydraulic module, and a second integrated interface (FL) of the integrated hydraulic module is communicated with a right oil cavity of the front wheel steering oil cylinder (7); a first integrated distribution port (RL) and a second integrated distribution port (RR) of the integrated hydraulic module are respectively communicated with a left oil cavity and a right oil cavity of the rear wheel steering oil cylinder (8).
9. The low load starting system for the aircraft tractor according to 1~7 wherein the hydraulic pump (1) is a duplex hydraulic pump consisting of a main oil pump and an auxiliary oil pump, the main oil pump of the duplex hydraulic pump is connected with a steering system oil path, and the auxiliary oil pump of the duplex hydraulic pump is connected with a cooling system oil path.
10. The low load starting system for an aircraft tractor according to 1~7 wherein a maintenance check valve is provided between the oil inlet and the oil outlet of the hydraulic motor (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223274136.0U CN218558952U (en) | 2022-12-07 | 2022-12-07 | Low-load starting system for aircraft tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223274136.0U CN218558952U (en) | 2022-12-07 | 2022-12-07 | Low-load starting system for aircraft tractor |
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| Publication Number | Publication Date |
|---|---|
| CN218558952U true CN218558952U (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223274136.0U Active CN218558952U (en) | 2022-12-07 | 2022-12-07 | Low-load starting system for aircraft tractor |
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| Country | Link |
|---|---|
| CN (1) | CN218558952U (en) |
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2022
- 2022-12-07 CN CN202223274136.0U patent/CN218558952U/en active Active
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