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Airplane tractor special four-wheel steering system and steering control method

An aircraft tractor and four-wheel steering technology, which is applied to steering mechanisms, steering rods, fluid steering mechanisms, etc., can solve the problems of many fault points, complex structures, and high cost

Active Publication Date: 2020-03-06
CHONGQING TECHKING IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first purpose of the present invention is to provide a four-wheel steering system for aircraft tractors to utilize the various working states of the three-position four-way valve in order to solve the shortcomings of the existing aircraft tractors, such as complex structure, high cost and many fault points. Switchable features, reducing the number of solenoid valves, lowering the cost, and effectively reducing failure points

Method used

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  • Airplane tractor special four-wheel steering system and steering control method
  • Airplane tractor special four-wheel steering system and steering control method
  • Airplane tractor special four-wheel steering system and steering control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1, see figure 1 , a four-wheel steering system for an aircraft tractor, comprising a front axle 1, a rear axle 2, left and right wheels respectively at both ends of each axle, a front wheel steering oil cylinder, a rear wheel steering oil cylinder, a solenoid valve 5, a full hydraulic The steering gear 6 and the controller 7; the full hydraulic steering gear 6 has two distribution ports, and the two distribution ports of the full hydraulic steering gear 6 correspond to the change of the steering direction of the vehicle to alternately change the state of oil supply and oil return, so as to pass to the The two oil chambers of the steering cylinder supply oil to realize the hydraulic steering of the vehicle; the solenoid valve 5 is a three-position four-way valve, including a solenoid valve oil inlet 5P, a solenoid valve oil return port 5T, a solenoid valve first port 5A and a solenoid valve. Valve second port 5B; solenoid valve oil inlet 5P is connected with a di...

Embodiment 2

[0046] Example 2, see figure 2 , when the steering wheel is turned to the right, the second port R of the steering gear supplies oil, and the first port L of the steering gear returns oil; when the steering wheel is turned to the left, the first port L of the steering gear supplies oil, and the second port R of the steering gear returns oil; The second port R of the steering gear is connected to the first oil chamber of the front steering oil cylinder 3, and the first port L of the steering gear is connected to the oil inlet port 5P of the solenoid valve, which can ensure that the three operating states of the solenoid valve have the same characteristics as that of embodiment 1. Steering mode, and the front wheels turn in the same direction as the steering wheel.

[0047] The rest of the structure of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

Embodiment 3

[0048] Example 3, see image 3 , the first port 5A of the solenoid valve is connected to the second oil chamber of the rear wheel steering cylinder 4 , and the second port 5B of the solenoid valve is connected to the first oil chamber of the rear wheel steering cylinder 4 . When the solenoid coil YA1 and YA2 of the solenoid valve are both de-energized, the front wheel steering mode is formed; when the solenoid coil YA1 of the solenoid valve is energized, the four-wheel steering mode is formed; when the solenoid coil YA2 of the solenoid valve is energized, the crab Steering mode, and the front wheels turn in the same direction as the steering wheel.

[0049] The rest of the structure of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0050] Obviously, the rest of the structure of this embodiment can also be the same as that of Embodiment 2.

[0051] It can be seen from this embodiment that the change of the connection mode between the two...

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Abstract

The invention discloses an airplane tractor special four-wheel steering system and a steering control method. The system comprises a front-rear-wheel steering oil cylinder, an electromagnetic valve, afull-hydraulic steering gear and a controller, wherein the front-rear-wheel steering oil cylinder is provided with two oil cavities; two distribution ports of the steering gear are controlled by a vehicle steering wheel so that the two distribution ports alternately supply oil and return oil; the electromagnetic valve is a three-position four-way valve, an oil inlet of the electromagnetic valve is connected with one distribution port of the full-hydraulic steering gear, a first port and a second port are connected with two oil cavities of one of front or rear wheel steering oil cylinders correspondingly, and two oil cavities of the other oil cylinder are connected with the other distribution port of the steering gear and an oil return port of the electromagnetic valve correspondingly. Thecontrol method is implemented based on the system. The airplane tractor special four-wheel steering system and the steering control method have beneficial benefits of simple system structure, low failure rate and three steering modes; and the control method realizes automatic control through the PLC and detects and corrects the centering state of the wheels so as to ensure accurate synchronization of front and rear wheel deflection and eliminate potential safety hazards of vehicle deviation.

Description

technical field [0001] The invention relates to vehicle driving control technology, in particular to a four-wheel steering system and a steering control method for an aircraft tractor used for full hydraulic steering. Background technique [0002] Aircraft tractor is a special vehicle used to tow aircraft at the airport. Due to the large tonnage and large traction power of the aircraft, its steering control usually adopts hydraulic steering. During the steering process, the direction is controlled by the steering wheel and the full hydraulic steering gear is used to provide The hydraulic oil circuit is converted to realize steering. Various steering modes such as front wheel steering, four wheel steering and crab steering are required during different phases of aircraft towing. The steering control of the existing tractor generally adopts the control of a plurality of electromagnetic valves to realize the on-off switching of the oil circuit, and then achieve the steering mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D7/15B62D5/06
CPCB62D7/1572B62D5/06
Inventor 帖剑黄小凡李洁
Owner CHONGQING TECHKING IND CO LTD
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