Transportation facility for aircraft

FIELD: mechanical engineering; ground servicing of aircraft.

SUBSTANCE: proposed transportation facility includes truck tractor and carrier with grip on free end with is engageable with aircraft front undercarriage leg. Facility is provided with automation unit consisting of sensor mounted on carrier which responds to linear changes in sizes and sends signal to control unit amplifier mounted on board aircraft for control of three-position solenoid-operated valve adjusting the working fluid delivery to actuating cylinders and quick-detachable pushers mounted on rear legs of aircraft undercarriage. They are connected with wheel hubs and are used for conversion of potential power accumulated during aircraft landing to torque on wheels of rear legs of undercarriage taking large part of its weight.

EFFECT: improved dampening characteristics of stabilizer.

3 dwg

 

The invention relates to mechanical engineering and can be used for ground handling of aircraft.

A device for transporting and maneuvering of aircraft, on a frame which has a cargo platform with folding ramp, hoist ramp in the form of a power cylinder with lever, connected to the ramp and locking mechanism of the nasal landing wheel of the aircraft on the cargo platform in the form of clamping levers driven by a power cylinder [1].

The device has a complex structure, large size and weight, it is not possible to adjust the coupling weight of the tractor depending on the specific conditions in tow.

Know another device for towing aircraft, containing the tractor, carrier, bearing on the end of the engagement, interacting with the front chassis of the aircraft, which allows you to adjust the loading wheels of the tractor in the initial period of movement to overcome the forces of inertia and movement on a support surface with a low coefficient of adhesion [2].

However, because the reload is in the rear of the tractor, there is a reduction of load on the front axle, resulting in poor handling.

It is also known a device for towing aircraft, based on the use of wheeled tractors, loaded b is ton and the metal plates, which increase the weight of the truck and improve the adhesion of the wheels with airfield floor [3]. However, this leads to unproductive expenditures service life of the tractor and increase fuel consumption.

Closest to the claimed technical solution is a transport device for towing planes containing the tractor, drove bearing on the free end of the engagement, interacting with the front landing gear, tow truck, which converts electrical energy produced by the equipment airfield mobile unit, a rotary motion of the wheels of the aircraft, making them the leading on the road [4].

However, this device has several disadvantages, the main of which are:

- the design complexity;

- high cost of manufacture and operation;

- great fuel consumption, as it requires the simultaneous operation of two motors;

- low maneuverability due to the large moment of resistance to rotation of the guided wheel aircraft towing trucks;

The technical result achieved by the proposed device is: the increase of the effective thrust of the unit during the initial period of movement that allows you to overcome the force of inertia and static friction, increasing its permeability, the ability of the protractor is Cai heavy aircraft light trucks.

We offer you the transfer unit of the aircraft includes: tractor, drove, United with the body of the tractor and carries at the free end of the grip, the sensor on the driver (e.g., strain gauge), the input signal through the electrical cable to the electronic control unit, and the three-position solenoid valve associated with the hydraulic tank and hydraulic power cylinders of the rear landing gear of the plane, interacting with the quick-pushers hub connected to the rim of the aircraft through the freewheel.

Common features of the prototype and the inventive device are used for a tow truck and drove connected to the front chassis of the plane.

The hallmark is the use of the sensor on the driver, allowing to automate the process of towing, responsive to linear changes of its size and the input signal on the amplifier control unit located on the aircraft, which interacts with the three-position solenoid valve regulating the flow of operating fluid in the cavity of the power cylinders, and having on the rear rack of the chassis of the aircraft quick release plungers connected with the hubs of the wheels, resulting conversion of potential energy accumulated in the moment of landing, torque is and the main landing gear wheels, perceiving the greater part of his weight that allows you to develop greater thrust on coupling with a bearing surface at the initial movement of the tractor and to overcome the force of inertia and static friction.

The inventive device is depicted in figure 1 - General view; figure 2 - schematic diagram of the operation of the device; figure 3 is a hydraulic diagram of the inventive device.

Figure 1 shows the transport device of the aircraft, including the following items: tractor 1, led 2 sensor 3, the electrical cable 4, the plane 5 with the electronic control unit 6, the front rack 7 and the rear of the rack 8.

Figure 2 shows a schematic diagram of operation of the device, including the following items: power cylinder 9, clamp the plunger 10, the hub 11, the freewheel 12, the wheel 13.

Figure 3 shows the hydraulic diagram of the inventive device, which includes the following elements: a power cylinder 9, the three-position solenoid valve 14, a filter 15, a hydraulic tank 16.

The device operates as follows.

At the moment of landing, with the landing gear of the aircraft 8 to the electronic control unit 6 sends the signal, which opens a three-position solenoid valve 14. Hydraulic fluid under gravity wheel rear landing gear of the aircraft 8 is fed into the power cylinders 9, the village is e fill them three-position solenoid valve 14 is closed. Before towing the tractor 1 by means of the carrier 2 with capture otstykovyvatsya to the front rack chassis plane 7, and the rear rack installed quick release plungers 10. At the start of movement of the tractor 1, the signal from the sensor 3, reacted to the linear dimensional changes took 2 through the electrical cable 4 is fed to the electronic control unit 6, and transmits the command to open the three-position solenoid valve 14, which is supplying the working fluid from the power hydrocylinders 9 in the tank 16, which leads to lowering of the body of the plane 5 down, with quick release plungers 10 crank wheel 11, which via a freewheel 12 turn the wheels of the aircraft 13. The use of sensor 3 driver 2 allows you to automate and simplify the process of towing, and the presence of quick-pushers 10 on the rear rack chassis plane 8 allows you to convert potential energy stored at the time of landing, the torque on the rear wheels 13, which account for a large part of the weight of the plane 5, which allows you to develop greater thrust as the adhesion to the support surface and the amount of torque at the initial movement of the tractor, to overcome the forces of inertia and static friction.

Experimental studies show that early on is to achieve a tractor when towing aircraft it is necessary to develop the traction approximately two times more than for the rectilinear uniform motion [5].

Manufacturing transport device of the aircraft is made from components and assemblies produced by industry.

Sources of information

1. SU 171165 A1, B 64 F 1/22, 07.02.1992, bull. No. 5.

2. EN 2139227 A1, B 64 F 1/22, 10.10.1999, bull. No. 28.

3. Tools of airfield-technical support flight (reference manual). Fears LN. M: Voenizdat, 1973. - 280 S.

4. EN 2194652 C2, 7 B 64 F 1/22, 20.12.2002, bull. No. 35.

5. Giants A.V. Increase the traction qualities of the airfield wheeled tractors. Dis. on competition of a scientific degree of Cand. technical Sciences. Voronezh, 1999

The transfer unit of the planes containing the tractor, drove bearing on the free end of the engagement, interacting with the front chassis of the aircraft, characterized in that it is equipped with automation device consisting of a sensor on the driver, responsive to linear changes of its size and the input signal on the amplifier control unit located on the aircraft, which controls the three-position solenoid valve regulating the flow of operating fluid in the cavity of the power cylinders, and the quick-pushers on the rear rack of the chassis of the plane connected with the wheel hubs and converts the potential energy stored at the time of landing, the torque at the rear wheels is x landing gear, perceiving the greater part of his weight.



 

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