JPH0459185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling device for a vehicle that has a high center of gravity during work, such as a crane truck, an aerial work vehicle, or a refueling truck.

Conventionally, in this type of vehicle with a high center of gravity,
In order to improve stability, it is necessary to increase the longitudinal distance of the vehicle, that is, the distance between the axles, and the distance in the left and right direction, that is, the distance between the wheels. It was not possible to set the distance between the axles and the distance between the wheels to obtain sufficient stability. For this reason, some machines use a jack called a stabilizer during work, but the position cannot be moved during work.

In view of the fact that these vehicles generally lower their center of gravity when running, the present invention provides a system that allows the distance between the axes of the four wheels and the distance between the wheels to be independently extended and contracted using hydraulic pressure. The aim is to provide a traveling device that allows stable work during work and facilitates travel by adjusting the distance between the axles and wheels as necessary so that they are large during work and small when traveling. Moreover, each wheel is driven and turned independently by hydraulic pressure, thereby making it possible to move in any direction.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 indicates a refueling truck for supplying fuel to an aircraft, and is constructed as follows. That is, 3 is a support that engages with the outer periphery of a support column (not shown) that stands upright on the chassis 5 and is movable up and down;
Reference numeral 7 denotes a workbench supported by the support 3 so as to be able to rise and lower; 9 a foldable handrail surrounding the workbench 7;
11 is an engine; 13 is an operating table for performing various operations such as raising and lowering the workbench 7 and running the workbench; 15 is an arm pivotally connected to a support frame 17 that stands upright on the workbench 7 so as to be able to move up and down; Tip connection fitting 2
1 and is raised and lowered by the expansion and contraction operation of the hydraulic cylinder 23. The other end of the refueling hose 19 communicates with a refueling vehicle (not shown). 25 and 27 are rear wheels attached to both ends of the rear crossbeam 29 that is fixed to the chassis 5; 31 is a bracket 33 that is fixed to the chassis 5;
A front crossbeam is pivotally connected to a shaft 35 by a shaft 37 so as to be swingable in the vertical direction, and front wheels 39 and 41 are mounted on both ends. Rear wheels 25, 27, front wheels 39, 4
1 is attached to the rear cross beam 29 and the front cross beam 31 are the same, so the configuration in which the rear wheel 25 is attached to the rear cross beam 29 will be described. That is, 43 is a case in which the rear wheel 25 is horizontally supported rotatably by bearings 45, 45, a travel hydraulic motor 47 is fixed inside, and a drive shaft 49 of the travel hydraulic motor 47 is supported by a spline 51. and is engaged with the axle 53 of the rear wheel 25. case 4
3, a vertical shaft 57 that is fixed to a bracket 55 that is fixed to the lower surface of the rear sliding girder 54 that is slidably fitted to the rear cross beam 29; and a vertical shaft 57 that is fixed to the upper surface of the rear sliding girder 54 via the bracket 59. A vertical worm wheel shaft 6 rotatably supported by a worm case 61
3 so as to be rotatable in the horizontal direction. The worm wheel shaft 63 is fixed to the worm wheel 67 via a key 65, and the lower end is attached with a bolt 69,
It is fixed to the case 43 by 69. A worm 71 engages with the worm wheel 67 and is rotationally driven by the steering hydraulic motor 73. The hydraulic motors 47, 73 are rotated by the oil pressure of a hydraulic pump (not shown) rotated by the engine 11, and are switched between forward and reverse rotation. The travel hydraulic motor 47 may drive the axle 53 via a reduction gear (not shown) as necessary. The rear sliding girders 54 at both ends of the rear cross beam 29 are bent rearward at an angle of 45 degrees, and the front sliding girders 75 at both ends of the front cross beam 31 are bent forward at an angle of 45 degrees. and 4 wheels 2
The positions of vertical axes 57, 57, . . . of 5, 27, 41, 39 are configured to form a regular square.
77 and 79 are respectively opposing rear sliding girders 5
4, 54 and the front sliding girders 75, 75. By telescopically operating the rear hydraulic cylinder and the front hydraulic cylinder interposed between the rear wheels 25, 27 and the front wheels 39, 41 in the left and right direction. It expands and contracts distance. 81 and 83 are sliding girders 5
This is a stopper that restricts the sliding range of parts 4 and 75. The vehicle body 5 consists of a front frame 85 and a rear frame 87, and the front frames 85 on both sides are connected to the rear frame 8.
7 in a slidable manner, and is expanded and contracted by a main hydraulic cylinder 89 to expand and contract the distance between the axes in the front-rear direction.

In the above embodiment, the steering hydraulic motor 73 of each wheel is rotated, and the worm 71, the worm wheel 67, and the worm wheel shaft 63 are used to rotate the steering hydraulic motor 73 of each wheel.
The case 43 is rotated horizontally, and each wheel 25,
27, 39, and 41, for example, in the longitudinal direction shown by the solid line in FIG. 2, and the travel hydraulic motor 47 of each wheel is rotated in the forward or reverse direction, the refueling truck 1 moves straight forward or backward. Moreover, if all four wheels are oriented in parallel in the lateral direction, the refueling truck 1 can be moved in the lateral direction. Or these 4
If the wheels are set perpendicular to the bending directions of both ends of the crossbeams 29 and 31 and all the wheels are rotated in the same direction, the refueling truck 1 will rotate on the spot around the center of the chassis 5. That is, depending on the attitude of each wheel and the forward/reverse direction of rotation, the chassis 5 can be made to travel in various ways, such as going straight, turning, and rotating.

The refueling truck 1 travels to a position below the wing of the aircraft, raises the work platform 7, connects the connecting fitting 21 to the refueling port provided on the underside of the wing, and supplies fuel from the refueling hose 19. However, the connection fitting 21
In order to match the location of the aircraft's fuel filler port,
Since the work cart 1 can be moved in any direction as described above, accurate positioning is possible.

In addition, when raising the workbench 7 during refueling, the main hydraulic cylinder 8 is
9 to extend the distance between the axes. At this time, all the wheels are placed in a position where they can run in the direction of expansion and contraction of the front frames 85, 85. Next, the rear hydraulic cylinder 77 and the front hydraulic cylinder 79 are extended to increase the distance between the wheels. In this case, all the wheels are in a posture that allows them to run in the direction of expansion and contraction of the sliding girders 54 and 75. In this way, by increasing the distance between the axes and the distance between the wheels, the cart can maintain stability even if the height of the center of gravity of the workbench is increased. When driving, the workbench is in the lowered position, so if you shorten the distance between the axles and wheels, contrary to the above, the width and overall length of the vehicle will become smaller, and the turning radius will also become smaller, making it easier to drive even in narrow spaces. This makes it easier.

According to the present invention, when the center of gravity becomes high during work, the distance between the shafts and the distance between the wheels is increased to stabilize the
When traveling with a low center of gravity, the distance between the axles and the distance between the wheels can be shortened, making it easier to travel and turn even in narrow spaces.

Further, the distance between the axles and the distance between the wheels can be independently expanded or contracted depending on the work, such as reducing only the distance between the wheels when passing through a narrow place, making the work easier.

Furthermore, by independently driving and turning each wheel using hydraulic pressure, the vehicle can move freely in any direction.

Although the above-described embodiment shows an aircraft refueling truck, the present invention can also be applied to other high-center-of-gravity work vehicles such as aerial work vehicles and crane trucks.

Furthermore, when extending and contracting the distance between the axes and the distance between the wheels, the wheels can be moved in the direction of expansion and contraction, so that the wheels can be expanded and contracted without lifting them with jacks or the like. Furthermore, since the vehicle body does not move up and down during expansion and contraction, expansion and contraction work can be performed even during work, making it safe and efficient.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a bottom view of the main parts, Figs. 3 and 4 are side sectional views and plan views of the main parts, and Figs. 5 and 6. is a front sectional view of other important parts. (Explanation of symbols representing main parts of the drawing), 2
5, 27... Rear wheel, 29... Rear crossbeam, 31...
Front cross girder, 39, 41...Front wheel, 43...Case, 47...Travel hydraulic motor, 54...Rear sliding girder, 73...Steering hydraulic motor, 75...Front sliding girder, 77... ...Rear hydraulic cylinder, 79...Front hydraulic cylinder, 85...Front frame, 87...Rear frame, 89...Main hydraulic cylinder.

Claims (1)

[Claims] 1. A front frame 85 and a rear frame 87 are provided on both sides, which are slidably fitted into each other horizontally in the front-rear direction and are telescopically operated by a main hydraulic cylinder 89, and the front frames 85, 85 and the rear frame on both sides A front crossbeam 31 and a rear crossbeam 29 are provided on the front crossbeam 31 and the rear crossbeam 29 which are horizontally suspended in the lateral direction, respectively, and are fitted into the front crossbeam 31 and the rear crossbeam 29 so as to be slidable in both directions, respectively. , are provided with front sliding girders 75, 75 and rear sliding girders 54, 54 which are telescopically operated by a front hydraulic cylinder 79 and a rear hydraulic cylinder 77, respectively, and the front sliding girders 75, 75 and the rear sliding girders 54 are provided. . A traveling device characterized in that front wheels 39, 41 and rear wheels 25, 27 are provided.