HU187352B - Airport tractor - Google Patents

Abstract

An airport tractor for towing of aeroplane service vehicles, e.g. steps, air-conditioning equipment, luggage and cargo transport trailers also has its own loading surface (16) for transportation of cargo. The tractor has a hydrostatic transmission mechanism the pump of which is directly coupled to the diesel engine (1) of the vehicle. The transmission has an electromagnetic reversing valve controlled by a three- way selector switch. The hydraulic steering (13) of the vehicle is connected with a mechanical auxiliary steering. The reverse control switch (15) is located on the outside surface of the tractor. The brake system includes duplex drum brakes for the front wheels and drum brakes for the back wheels. <IMAGE>

Description

The invention relates to an airport towing vehicle and is advantageously applicable to towing aircraft servicing devices such as passenger stairs, air-conditioning units, and cargo and freight trailers. In addition, the towing vehicle has its own cargo area, which allows significant loads to be carried.

There are many designs of airport tow trucks. Thus, for example, a tow vehicle operating under conditions similar to known airport traffic conditions and having a towing capacity of approx. 110 tons and equipped with automatic transmission.

It is also known to have a tractor with a design which does not have the aforementioned high traction power, but its good maneuverability and maneuverability allow it to be used in a variety of applications within certain performance limits.

The object of the present invention is to provide an airport towing vehicle which due to its large size due to its large traction power in the field of airport work, for example stairs to machines, air conditioners to machines, lorries to be towed from the machine and towing the machine itself. very advantageous and within its power range.

This object is achieved by providing a towing vehicle which is characterized by having a hydrostatic drive having an axial piston drive that is in direct communication with the vehicle's diesel engine. The transmission of the vehicle has a three-way pre-selection switch with an electromagnetic check valve connected to the control.

The steering wheel is equipped with a hydraulic steering wheel, which is connected to a mechanical emergency steering. A reverse control switch is provided on the exterior surface of the vehicle.

Conveniently designed brakes are designed as duplex drum brakes for the front wheels and drum brakes for the rear wheels.

The technical solution of the present invention is described in detail in a preferred embodiment, in which:

Figure 1 is a schematic side view of a

Figure 2 is a plan view of the embodiment of Figure 1.

1, 2, the engine 1 is located at the rear of the vehicle. Said engine is a four-cylinder, in-line, stationary, direct-injection, four-stroke diesel engine, with a closed water-cooling system, and a dry-paper air filter 4.

1 environment of the engine 2 and radiator 3 olajhű- stem ⁵ is arranged. Above these are the fuel tank 5 and the hydraulic tank 6. The vehicle is equipped with a hydrostatic drive.

The hydrostatic drive 7 axial piston drive is directly from the engine with the same RPM. The connection between the motor and the pump cannot be solved.

The angular position of the pump skewer is controlled by the driver by actuating the charge engine pedal (accelerator) of the charge engine while changing the engine speed. The speed of the vehicle can thus be varied in increments of ⁵ . Forward and reverse can be preselected by a solenoid-operated 4/3 valve on the pump using a three-position switch. The closed-loop hydrostatic drive has a final drive. ¹⁰ The axial piston motor of the hub gear has a variable fluid intake. The angle of the motor 1 varies automatically from 14.5 to 25 ° as a function of operating pressure.

The steering is trapezoidal. The steering gear 13 is formed as a power steering ^15, to which the gear pump on the engine supplies the oil. In the event of a malfunction of the motor or the pump, the steering gear is provided with emergency steering 13 / a.

⁰ The front axle is steered with a tilt around a horizontal axis pin.

The rear axle consists of wheel hubs mounted rigidly to the chassis by screw connection. The differential effect required in the arc passage is provided by a hydrostatic drive ²⁵ .

The braking system is a combined actuated hydraulic brake acting as a duplex drum brake 14 acting on the two front wheels 12 and a gear actuator acting on the two rear wheels 10 and a spring-loaded drum brake 8.

³ θ The parking brake acts on the brake system on the two rear wheels. The oil pressure required to release the spring-loaded drum brake 8 is provided by the charge pump of the axial piston pump.

Claims (2)

Patent claims 1. A towing vehicle, mainly an airport service vehicle45, for towing or transporting luggage, trailers and aircraft towing and, where appropriate, for use outside the airport, characterized by a hydrostatic engine having an axial piston drive ⁵⁰ (7) of the vehicle's diesel engine (1) is in direct connection by means of an insoluble clutch (9), and the transmission is equipped with a solenoid valve in control connection with a three-way pre-selection switch, and hydraulic It has a 55 steering wheel (13) and a mechanical emergency steering wheel (13 / a) attached thereto, and a reverse control switch (15) is provided on the exterior surface of the vehicle. The towing vehicle of claim 1 60, characterized in that it has a duplex drum brake (14) connected to the front wheels (12) and a spring-loaded drum brake (8) connected to the rear wheels (10).