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.
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 .
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 .
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 . 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 .
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 .
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.
FIELD: aviation; airfield equipment for towing helicopter provided with skid-type landing gear.
SUBSTANCE: towing the helicopter is carried out on one front and two rear two-wheeled trolleys by tow bar of front trolley; effort for motion of rear trolleys is transmitted from front trolley through skids of landing gear. Rear trolleys are rolled on different sides of rear part of skids by wheels. Each skid is caught by pins on either side by means of towing rods; pins are fitted in bushes of skid. Front trolley is positioned between front parts of skids which are connected by means of clamp fitted on hoist of trolley which is provided with technological attachment units for securing the skids. Skid-type landing gear is hoisted by means of this hoist to height at which helicopter is towed over ground of varying firmness. Loads between wheels of rear trolley are distributed by simultaneous lowering of one wheel on section of path at lesser firmness of ground due to hoisting of other wheel on section of path at firmer ground. Device proposed for towing the helicopter includes three two-wheeled trolleys. Tow rods of rear trolleys are made integral with side walls of support and are secured between wheels for deflection. Tow rods are provided with slots for catching the pins on both sides of skid by shifting. Wheel axles are mounted on double-arm levers; one end of each lever is connected with rod of hydraulic cylinder imparting turn to levers and other arm is used for hoisting the wheels. Steps provided over periphery of levers are engageable with wheel height retainers. Hoisting mechanism of rear trolleys include hand-operated hydraulic pump connected through T-piece with two hydraulic cylinders by means of pipe lines; rods of these cylinders are connected at one end with levers; mounted at other end are return springs for return of levers to initial position and handle. Hoisting mechanism of front trolley consists of hydraulic cylinder and lever provided with clamp and hand-operated hydraulic pump connected with hydraulic cylinder by means of pipe line; rod of this hydraulic cylinder is connected with center of lever at one end for making the clamp hoist; return spring for return of clamp to initial position is mounted on other end. Lever is provided with stop with clamp height retainer.
EFFECT: enhanced efficiency and reliability.
17 cl, 11 dwg
FIELD: ground servicing of aircraft; aircraft transportation facilities.
SUBSTANCE: proposed device has frame-carrier connected with raising hydraulic cylinders by means of vertical guide and spherical support with truck tractor frame. Spherical support is mounted on truck tractor frame for longitudinal motion. Connected with frame-carrier by means of rod is control hydraulic cylinder whose body is rigidly connected with frame of truck tractor in longitudinal vertical plane. Raising and control hydraulic cylinders are interconnected by means of oil line. Rod chamber of control hydraulic cylinder is connected with return line through hole shut-off by piston and with rodless chamber of raising hydraulic cylinder by means of check valve controlled by it. Proposed device smoothly increases adhesion weight of truck tractor at acceleration using aircraft braking energy for recharging the hydraulic accumulator of replenishing unit.
EFFECT: enhanced efficiency; reduced dynamics and improved power parameters.
FIELD: transport engineering; railless vehicles.
SUBSTANCE: proposed trailer-train consists of prime mover and semitrailer whose support device is set into action through hinge chain from pivot rotating around its axle and coupled with drive mechanism. Pivot is made hollow, is equipped with shutoff ball valve and connected at one side with pneumatic brake system of semitrailer and at other side, through like valve, with pneumatic brake system of prime mover.
EFFECT: improved operating conditions at servicing of trailer-train.
FIELD: transport engineering; railless vehicles.
SUBSTANCE: proposed trailer-train consists of prime mover with fifth-wheel coupler gear mounted on its frame and coupled with semitrailer through pivot movable in longitudinal plane of semitrailer frame, main wheels connected to semitrailer frame by means of spring suspension, and spare wheels. At least pair of spare wheels is installed for rotation on pins rigidly secured on semitrailer frame, being movable arranged for transmission of traction force from prime mover to semitrailer between guides. Said guides are rigidly secured on frame of prime mover in its cross plane and they have wavy profile in horizontal plane.
EFFECT: improved efficiency of trailer-train owing to increased load capacity at existing overall dimensions of prime mover and semitrailer.
FIELD: transport engineering; railless vehicles.
SUBSTANCE: proposed large-capacity trailer-train includes prime mover with pneumatic brake system and fifth wheel coupler engaging with pivot rigidly secured on frame and semitrailer also provided with pneumatic brake system connected with pneumatic brake system of prime mover. Frame of semitrailer in hinge-connected with rod of pneumatic cylinder arranged coaxially with longitudinal axis of its symmetry. Cylinder is hinge secured on pivot movably arranged in guides of semitrailer frame and spring-loaded relative to frame. Underpiston space of cylinder arranged from side of pivot is connected to pneumatic brake system of said semitrailer by means of pipeline.
EFFECT: improved safety in operation of large-capacity trailer-trains.
FIELD: transport engineering; railless vehicles.
SUBSTANCE: proposed trailer-train consists of prime mover with fifth wheel coupler engaging with semitrailer by pivot rigidly secured on support plate of step of semitrailer frame, and pneumatic brake system including compressor, connecting pipelines, brake cock, air cylinders, air distributing valves and wheel brake chambers. Pivot is made hollow accommodating shutoff valve. At one side pivot hermetically adjoins cup spring-loaded relative to turntable of fifth wheel coupler also furnished with shutoff valve and connected by pipeline to air cylinder of semitrailer, and at other side, to solid slider spring-loaded by compression spring to semitrailer frame and provided with slot of semielliptical shape with flexible pipeline connected to pipelines of semitrailer wheel brake chambers. Spring-loaded slider is connected with rod of pneumatic cylinder whose housing is connected to semitrailer frame, and space, also through pipeline, is connected with pipelines of said brake chambers of semitrailer wheels.
EFFECT: improved safety of trailer-train by preventing jack-knifing at braking.
FIELD: transport engineering; crawler vehicles.
SUBSTANCE: proposed articulated vehicle contains two track bogies, load platform body with fitted on cabin, power plant, hydromechanical and propeller shaft drivers installed on crawler track bogies by means of slewing circles with rocking limiters. Front slewing circle is made in form of horizontal cross with three degrees of freedom. Cross necks of cross are hinge-coupled with track bogie frame and longitudinal necks are hinge-coupled with pedestal of load platform body through chuck plate.
EFFECT: improved reliability, increased service life, high cross-country capability.
2 cl, 11 dwg
FIELD: transport engineering.
SUBSTANCE: invention can be used to decrease course drift of trailers of tractor trains. Proposed automatic device to decrease course drift of trailer has operating members in for of hydraulic cylinders mounted on trailer chassis, electromagnetically controlled hydraulic system, hydraulic pump and distributor with bypass valve. Device is furnished with additional independent operation distributors controlled by solenoids arranged on trailer chassis, transistors forming power circuit including solenoids and lamps showing direction of trailer drift arranged in driver's cab and control circuit including contact group which controls operation of operating members and being essentially sealed contacts controlled by permanent magnet and arranged on chassis of trailer between trailer slewing circle and load platform. Placed in control circuit is sealed contact operated by permanent magnet and located on steering column which controls operation of automatic device reducing drift of trailer at cornering.
EFFECT: increased speed of train and capacity, reduced tendency to jack-knifing when negotiating slopes, simplified design.