JPH04271950A - Wheel pressure balance device for horizontal transporting dolly - Google Patents

Abstract

PURPOSE:To apply each nearly equal wheel pressure to each wheel by installing a pair of dolly frames which are arranged in parallel at the left and right and have front and rear wheels and connecting both the dolly frames by pivotally installing each corner part in the upper part of each dolly frame by a connecting beam. CONSTITUTION:Front wheels 4 and 5 as driving wheels and rear wheels 6 and 7 as driven wheels are installed on one dolly frame 1 and the other dolly frame 2. One connecting beam 8 is installed at one corner part over both the dolly frames 1 and 2, i.e., over the front wheels 4 and 5, and both 1 and 2 are connected by pivotally installing one edge of the connecting beam 8 with the dolly frame 1 and welding the other edge with the dolly frame 2. A load 10 is supported by forks 9 which are projectingly installed at the front and rear parts of the inside lower part of the dolly frames 1 and 2. Accordingly, each nearly equal wheel pressure is applied on the wheels 4-7, independently of the start of a road surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel pressure balance device for a horizontal transport vehicle such as an unmanned vehicle for transportation equipment or an industrial forklift.

0002

2. Description of the Related Art A conventional transport truck has a structure as shown in FIGS. 7 and 8, for example. In the figure, 21 is the body of the carrier, 22 is the tread, 23 and 24 are drive wheels, 25 is the front driven wheel, 26 is the rear driven wheel, 27 is the cargo to be transported, and 28 is the running of the carrier. It is an arrow indicating the direction.

0003

[Problems to be Solved by the Invention] As mentioned above, in the conventional transport truck, the driving wheels 23 and 2 are mounted in the center of the vehicle body 21.
4, and driven wheels 25 and 26 are provided in front and behind it, so the wheel pressure due to the weight W of the cargo 27 is equal to the driving wheels 23 and 24.
The wheels of the driven wheels 25 and 26 are small. Therefore, if we look at the tread 22, locally the driving wheels 23,
24, the entire surface of the tread surface 22 must have a compressive strength that can withstand the large wheel pressure.

The present invention aims to solve the above problems. That is, an object of the present invention is to provide a wheel pressure balance device for a horizontal transport vehicle in which the wheel pressure is not concentrated only on the driving wheels, but is distributed to the driven wheels so that the wheel pressure is applied almost equally to each wheel. The purpose is to

[0005]

[Means for Solving the Problems] In order to achieve the above object, the wheel pressure balance device for a horizontal transport vehicle of the present invention is provided in parallel, with front wheels and rear wheels running on treads below each other. one truck frame and the other truck frame having wheels, and the one truck frame and the other truck frame have a connecting beam pivoted at one upper corner of the truck frame. It is assumed that the two parts are attached and connected.

[0006]

[Function] According to the present invention, even if the tread surface of one of the bogie frames and the other bogie frame having front wheels and rear wheels on the lower side is uneven, the treads for which wheels are uneven, the two bogie frames are pivoted between one upper corner by a single connecting beam, so the wheel pressure is almost equally distributed evenly when it is on a horizontal surface, without being affected by the unevenness of the surface. wheel pressure is obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of the present invention. In the figure, 1 is one bogie frame, 2 is the other bogie frame, 3 is a tread, 4 is a front wheel as a driving wheel attached below the one bogie frame 1, and 5 is the other bogie frame. 2 is a front wheel as a driving wheel attached below the one bogie frame 1, 6 is a rear wheel as a driven wheel attached below the one bogie frame 1, and 7 is a follower wheel attached below the other bogie frame 2. The rear wheel is the driving wheel. Reference numeral 8 designates a connecting beam, which will be described later, and is provided at one corner above the bogie frames 1 and 2, that is, above the front wheels 4 and 5, to connect the two frames. 9 is a fork, and 10 is luggage. Note that the arrow 14 in FIG. 1 indicates the traveling direction of this carrier.

As shown in the enlarged and partially cutaway cross section of FIG. 4, the connecting beam 8 has one end pivotally connected to one bogie frame 1 and the other end welded to the other bogie frame 2. ing. That is, one end of the connecting beam 8 is connected to the bush 11 and the bearing member 12 with respect to one truck frame 1.
Since the connecting beam 8 and one of the truck frames 1 can be rotated relative to each other, the connecting beam 8 and one truck frame 1 are rotatably attached to each other and are prevented from coming off by the retaining member 13.

In the wheel pressure balance device for a horizontal transport vehicle constructed as shown in FIGS. 1 to 3, one vehicle frame 1 and the other vehicle frame 2 are provided in parallel, and a Each wheel installed 4, 5, 6
, 7 can be set to almost the same conditions with respect to the weight of the luggage 10, so that wheel pressure is applied almost equally to each wheel 4, 5, 6, and 7.

[0010] Due to the unevenness of the tread surface 3, the wheels 4
, 5, and 7 are flat surfaces, and if the wheel 6 falls on a concave surface, the other bogie frame 2 will remain normal, and one bogie frame 1 will fall on the connecting beam 8, as shown in FIG. Each wheel 4, 5, 6, 7 rotates clockwise with no force around the axis, and the wheel 6 comes into contact with its concave surface.
A wheel pressure approximately equal to is applied. That is, the rear wheels 6, 7
When passing through an uneven surface, the whole of one bogie frame 1 or the other bogie frame 2 rotates around the axis of the connecting beam 8, which is approximately equal to each wheel 4, 5, 6, 7. Wheel pressure is applied.

Further, as shown in FIG. 6, when the front wheel 5 has a concave surface that is lower by h, the whole of both bogie frames 1 and 2 are tilted toward the concave side by θ. Also, when the front wheel 4 has a convex surface, it tilts as shown in FIG. Further, when the front wheel 4 has a concave surface or when the front wheel 5 has a convex surface, the slope is opposite to that shown in FIG. That is, the front wheels 4,
When the wheel 5 passes over an uneven surface, the entirety of both bogie frames 1 and 2 is tilted, and approximately equal wheel pressure is applied to each wheel 4, 5, 6, and 7.

In this way, when each wheel 4, 5, 6, 7 passes on a flat surface, as well as when passing on an uneven surface, the wheel pressure is not concentrated on a particular wheel, and each wheel 4, 5, 6, 7 is 5,6
, 7 is applied. In addition, since the single connecting beam 8 connecting the bogie frame 1 on one side and the bogie frame 2 on the other side is provided at one corner above both bogie frames 1 and 2, in other words, Since it is not provided in the center, even if the height of the loaded cargo 10 is too high, there will be no problem at all, and therefore the allowable loading height of the trolley is greatly improved. Moreover, if the connecting beam 8 is not shifted to one side but is provided in the center, for example, when the rear wheels 6 and 7 pass through a concave or convex surface and go down or up, they will inevitably fall into a plane corresponding to the concave or convex surface. The front wheels 4, 5 passing through tend to be lifted or lowered, causing the corresponding front wheels 4, 5 to tend to be lifted or lowered.
5 will decrease or increase, but by shifting the connecting beam 8 to one side, such a problem will not occur.

[0013]

[Effects of the Invention] As explained above, according to the present invention,
Since one truck frame and the other truck frame, each having a front wheel and a rear wheel running on a tread below each other, are installed in parallel, each wheel has approximately the same weight with respect to the weight of the loaded cargo. In addition, the one truck frame and the other truck frame are connected by one connecting beam pivoted to one corner of the upper part of the truck frames. If the tread is a flat surface with no unevenness, or even if the surface is uneven, one of the bogie frames will move toward the axis of the connecting beam depending on the vertical movement of the wheel corresponding to the unevenness. The bogie frame rotates around the center of rotation, or the entire bogie frame tilts, and substantially equal wheel pressure is applied to each wheel without concentrating the wheel pressure only on a specific wheel. Therefore, it can be used even in places where the floor surface that becomes the tread is unfinished, such as at a construction site. Furthermore, since the connecting beam is provided at one corner above both the bogie frames, the permissible loading height of the bogie can be greatly improved, and the wheels connected to each of the wheels The pressure can be more or less equalized.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a partially cutaway enlarged sectional view taken along section line A-A in FIG. 3;

FIG. 5 is an illustration of one operation of the device of FIG. 1;

FIG. 6 is an explanatory diagram of another operation of the device of FIG. 1;

FIG. 7 is a front view showing an example of a conventional technique.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

1, 2: Trolley frame 3: Tread 4, 5: Front wheel 6,7: Rear wheel 8: Connecting beam 10: Luggage

Claims (2)

[Claims] Claims: 1. A truck frame comprising one truck frame and another truck frame, which are arranged in parallel and have front wheels and rear wheels running on a tread below each, and the one truck frame and the other truck frame. A wheel pressure balance device for a horizontal transport truck, characterized in that the other truck frames are connected to one corner of the upper part of the truck frames by pivotally connecting one connecting beam. 2. The wheel pressure balance device for a horizontal transport vehicle according to claim 1, wherein either the front wheel or the rear wheel is a driving wheel, and the connecting beam is located above the driving wheel.