WO1983003400A1

WO1983003400A1 - Tractor truck

Info

Publication number: WO1983003400A1
Application number: PCT/SE1983/000122
Authority: WO
Inventors: Karl Tomas Bergling
Original assignee: Karl Tomas Bergling
Priority date: 1982-03-31
Filing date: 1983-03-30
Publication date: 1983-10-13
Also published as: SE8202054L; NO834395L; EP0105313A1; SE439287B; FI834357A; FI834357A0

Abstract

Tractor truck, intended for moving goods receptacles, trailers and semitrailers. This vehicle has a front axle (10) which may simultaneously constitute a steering axle, and one or more driving axles (8, 9), a frame (6) and a loading coupling device (3) at the rear portion of the vehicle for connecting the vehicle to the goods receptacle (2) which is to be towed. The vehicle frame (6) is turnably articulated at the load coupling device (3) with the aid of a vertical shaft (7), the load coupling device being intended for rigid connection to the load in the horizontal plane. The vertical shaft (7) is coupled to unillustrated torque-providing means, which are adapted for turning the vehicle in the horizontal plane in relation to the load coupling device, thus to steer the vehicle and load.

Description

Tractor Truck

The present invention relates to a tractor truck, particularly intended for moving goods receptacles or so- called containers, and includes at least one front axle, one or more driving axles, a frame and a load coupling device at the rear portion of the vehicle for connecting the vehicle to the load or vehicle that is to be towed.

At ports, air fields and railway stations there is a great need of simple and effective means for moving containers, semitrailers etc. Amongst other things, the development in ports throughout the world is consequently towards increased use of so-called roll on- roll off handling, which is effected by the load being rolled off and on ferry-like ships via special ramps. The ships are expensive and there is a strong wish for rapid handling and short turnaround times in ports, which makes for great interest in effective load handling methods.

There is a known tractor truck, which is described in the Swedish published specification 412 571, and which may be used for moving containers on board ship and in ports, and which gives good manoeuverability. The drawback with this known tractor truck is that its driving wheels are turnable in relation to the vehicle chassis, which makes transmission very complicated and also results in problems with the vehicle tires, since the driving wheels will be relatively small and therefore very highly loaded.

The present invention has the object of providing a tractor truck primarily intended for moving wheeled containers or semitrailers and which is more stable and flexible, as well as cheaper to manufacture than known tractor trucks of this kind.

The inventive tractor truck is characterized in that the vehicle is turnably articulated at the load coupling device by means of a vertical shaft, said device being intended to be rigidly coupled to the load in the horizontal plane, while the vertical shaft is connected to torque-providing means adapted to turn the vehicle in the horizontal plane in relation to the load coupling device thus to steer the vehicle.

The advantage with a tractor truck in accordance with the invention is that together with the container or semitrailer it forms an inflexible rig which gives the driver a better view. Furthermore, the inventive vehicle cannot "jack-knife" for heavy loading, which also prevents the vehicle from losing steering ability due to lifting of the front wheels, as can be the case with known tractor trucks, e.g. those with a bearing plate or so-called "fifth wheel". By the inventive vehicle connected to the wheeled load having a large support surface there is obtained better lateral stability than with known vehicles of this kind, which is of great importance in transporting large loads. The vehicle with load furthermore has a very small turning circle and good manoeuverability, which is essential for example in the confined spaces in question on a ship.

The invention will now be described in detail in the following while referring to the accompanying drawing on which the Figure is a schematic side view of an embodiment of a tractor truck in accordance with the invention.

The tractor truck 1 , illustrated on the drawing, is connected to a wheeled goods receptacle or container 2 via a coupling device 3 with a yoke 4 , which is coupled to one end of the container 2. At its other end the container is provided with removable wheels 5. The device 3 is joined to the vehicle frame 6 via a vertical shaft 7 coupled to an unillustrated torque motor, intended to turn the vehicle, and thus steer it when the container 2 is coupled. The vehicle then rests on the substructure with the aid of both driving axles 8 and 9, while the front axle 10, which is also the steering axle, is lifted from the substructure. The front axle must be steerable, however, so that the vehicle may be driven without load. The front axle may be steerable, either conventionally, or with the aid of so-called "waist steering". The turnable attachment between the load coupling device and the vehicle frame may be stiff or articulated in the vertical plane. The device 3 may be raisable and lowerable, e.g. with the aid of a lifting cylinder or lifting arm, or the wheels 8,9 may be raisable and lowerable in relation to the vehicle frame.

Moving the container 2 is accomplished by the vehicle 1 being driven in towards the container, the vehicle and container being afterwards coupled together with the aid of the coupling device 3. The container end connected to the yoke 4 is then lifted by the device 3 being raised, or by the vehicle driving axles 8,9 being thrust out from the vehicle frame 6. To reduce wheel scrubbing the front axle 10 is raised in the case where lifting the container is done with the aid of the device 3. The vehicle may then be propelled forwards or backwards by the drive on axles 8,9 and the vehicle may be steered with the aid of the torque motor coupled to the vertical shaft 7. It should be noted that it is not necessary to raise the front axle 10 for driving the vehicle.

The vehicle does not need to have two driving axles, as in the illustrated embodiment, but may only have one axle or more than two should this be found necessary. The front axle 10 may be lifted with such as pneumatic cushions from which the air can be evacuated, or by the entire vehicle being pivotable about a horizontal axis. In some cases, the steerable front axle may be dispensed with entirely, e.g. if the vehicle is centrally articulated or can be braked differently on its right- and left-hand sides. Hereinbefore there has been described a special embodiment of a tractor truck with a coupling device which is rigidly connected in the horizontal plane to the goods receptacle that is towed. The invention is not restricted to this special embodiment, and it can include different variations within the scope of the claims. For example, the rigid coupling to the load in the horizontal plane may be achieved with the aid of a so-called "swan neck" with a horizontal tongue which is inserted in a recess in a special semitrailer on which the load rests.

Claims

1. Tractor truck, particularly intended for moving wheeled goods receptacles (2) and semitrailers, including at least one front axle (10), at least one driving axle (8, 9), a frame (6) and a load coupling device (3) at the rear portion of the vehicle for connecting the vehicle to the load (2) which is to be towed, characterized in that the vehicle is turnably articulated at the load coupling device (3) with the aid of an upstanding or vertical shaft (7), the device bieng intended for rigid connection to the load (2) in the horizontal plane, and in that the vertical shaft is coupled to torque-providing means adapted to turn the vehicle in the horizontal plane in relation to the device (3), thus to steer the vehicle and load.

2. Tractor truck as claimed in claim 1, characterized in that the vertical shaft (7) is rigidly connected to the load coupling device (3).

3. Tractor truck as claimed in claim 1 or 2 , characterized in that the torque-providing means is a torque motor.

4. Tractor truck as claimed in claim 1 or 2 , characterized in that the torque-providing means is a motor and worm gear.

5. Tractor truck as claimed in claims 1 - 4 , characterized in that the load coupling device (3) is raisable and lowerable in relation to the frame (6).

6. Tractor truck as claimed in claims 1 - 5 , characterized in that the vertical shaft (7) inhibits movement in the vertical plane between the vehicle and load coupling device (3).

7. Tractor truck as claimed in claims 1 - 6 , characterized in that the vertical shaft constitutes part of the vehicle.

8. Tractor truck as claimed in claims 1 - 6 , characterized in that the vertical shaft constitutes part of the load coupling device (3).

9. Tractor truck as claimed in claims 1 - 6, characterized in that the vertical shaft constitutes part of the goods receptacle or semitrailer.