JPH05178208A - Self-traveling truck - Google Patents

Abstract

PURPOSE:To enable a truck to travel on a track including a curve, and minimize the dead space at the bottom of the self-traveling truck. CONSTITUTION:A bearing 2, which bears a wheel 1, is attached slidably to a linear guide 5, and it can slide in the direction perpendicular to the direction of advance. A shaft 6 is fixed to the linear guide 5, and the shaft 5 can rotate by the bearing fixed to the bottom of a self-traveling truck V, but it is energized to keep the posture perpendicular to the advance direction of the self-traveling truck V by a stopper 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled carriage including a curve in its track, and more particularly to a wheel structure.

[0002]

2. Description of the Related Art In a self-propelled carriage that travels on a track and conveys articles, when the track includes a curve, the inner and outer wheels have different trajectories on the curve, so the distance between the left and right wheels must be variable. I will derail. For this reason, the wheels on one side of the self-propelled bogie have an eccentric link and a turning function.

FIG. 5 is a side view showing the wheels of a conventional self-propelled carriage. In the figure, a wheel 1 is received by a bearing 2 and rolls on a rail 3. The bearing 2 is provided with four guide rollers 4, and the rail 3 is sandwiched from both side surfaces to prevent the wheel 1 from derailing from the rail 3.

A shaft 10 is attached to the bearing 2,
The shaft 10 is rotatably attached near one end of the link 11. Therefore, the bearing 2 is rotatable with respect to the link 11. A shaft 12 is attached near the other end of the link 9 and is rotatably received by a bearing 13. The bearing 13 is attached to the lower surface of the main body of the self-propelled carriage.

[0005]

According to the wheel having such a structure, since the wheel 1 moves along the rail 2 to change the distance between the two wheels and to change the direction along the rail 2, the wheel removal It is possible to roll on the rail 2 without doing. However, since the link 11 turns on the lower surface of the self-propelled carriage having such wheels, members cannot be installed within the turning range of the link 11. Normally, the lower surface of a self-propelled trolley is equipped with electrical equipment, sensors, etc., and this turning range becomes a wasteful space, increasing the size of the self-propelled trolley and imposing functional restrictions. Was there. Further, when the traveling direction of the self-propelled carriage is switched, that is, when the self-propelled carriage that has been moving forward in the direction of the solid line arrow in FIG. , I was unable to drive smoothly.

[0006] Therefore, an object of the present invention is to provide a self-propelled trolley provided with wheels having a structure capable of minimizing the dead space on the lower surface of the self-propelled trolley and capable of switching between forward and reverse.

[0007]

In order to achieve the above object, the present invention provides a linear guide that is rotatable about a vertical axis and is biased to maintain a posture perpendicular to the traveling direction. A self-propelled trolley was constructed including wheels that were slidably attached to it.

[0008]

Since the present invention has the above-mentioned structure, it has the following effects.

In the self-propelled carriage according to the present invention, the wheel slides with respect to the linear guide to change the distance between the two wheels, and the linear guide is rotatable about a vertical axis. Thus, the wheels can follow the rails and turn.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below.

1, 2, and 3, respectively, are a front view showing a wheel portion of an embodiment of a self-propelled carriage according to the present invention, a side view with a part cut away, and a view taken along the line III-III of FIG. Is. The same members as those shown in FIG. 5 are designated by the same reference numerals.

In each drawing, the bearing 2 of the wheel 1 is slidably attached to the linear guide 5. A shaft 6 is fixed to the upper surface of the linear guide 5, and the shaft 6 is rotatably attached to a bearing 7. Bearing 7
Is fixed to the lower surface of the body of the self-propelled carriage V.

A fixed frame 8 is provided on the lower surface of the self-propelled carriage V.
Are fixed, and two pushers 9, 9 project from the side surface of the fixed frame 8 in the direction toward the linear guide 5. Each pusher 9, 9 has a push pin 9a.
And a guide 9b through which the push pin 9a is slidably inserted in the axial direction. The crown 9c at the front end of the push pin 9a is in contact with the side surface of the linear guide 5, and a spring 9d is provided between the crown 9c of the push pin 9a and the guide 9b. Pushes the push pin 9a toward the linear guide 5. A screw is cut at the rear end of the push pin 9a, and an adjusting bolt 9e is screwed on the push pin 9a so that the length of the push pin 9a protruding from the guide 9b can be adjusted.

In such a self-propelled carriage, since the bearing 2 of the wheel 1 can slide along the linear guide 5 when the self-propelled carriage travels on the curved portion of the rail 3,
The distance between the left and right wheels can be changed according to the rail 3, and the linear guide 5 can be rotated by the bearing 7. Therefore, the wheel 1 can turn following the rail 3 to change its posture.

Further, since the linear guide 5 is biased by the two pushers 9 so as to maintain a posture in which the linear guide 5 is oriented in a direction perpendicular to the traveling direction of the self-propelled carriage, the linear guide 5 turns. The range of movement is limited, so that the dead space on the lower surface of the self-propelled carriage can be reduced, and since the wheel 1 is not located behind the bearing 7 in the traveling direction, the self-propelled carriage changes direction. However, it is possible to drive smoothly.

FIG. 4 is a partially cutaway side view showing a wheel portion of another embodiment of the self-propelled carriage according to the present invention. The same members as those in the embodiment shown in FIG. 1 are designated by the same reference numerals.

A shaft 14 is slidably attached to the linear guide 5 of the wheel portion shown in FIG. Axis 1
4 is rotatably attached to the bearing 15,
The bearing 15 is fixed to the bearing 2.

In this embodiment, since the wheel 1 can rotate about an axis perpendicular to the linear guide 5, it is possible to compare with the self-propelled carriage of the first embodiment shown in FIGS. Then, in addition to the function and effect of the first embodiment, smoother running can be realized.

In each of the embodiments shown in FIGS. 1 to 3 and 4, the stroke length of the linear guide 5 and the stopper 9 are used.
The range in which the linear guide 5 can turn, which is restricted by, is designed so that the vehicle can travel in consideration of the maximum moving distance and the maximum turning angle of the wheels that are determined by the distance between the two wheels of the self-propelled carriage and the curvature of the curve. To be done.

The embodiment of the present invention has been described above.
It is needless to say that the present invention is not limited to the above-mentioned embodiments and can be appropriately modified within the scope of the gist of the present invention.

[0021]

As described above, according to the self-propelled carriage according to the present invention, the wheels follow the rails and move in the direction perpendicular to the traveling direction, and the posture can be changed.
You can run on a curve without taking off. In addition, since the linear guide is biased so as to maintain a posture perpendicular to the traveling direction of the self-propelled carriage, the turning range of the linear guide is limited, so that the dead space on the lower surface of the self-propelled carriage is reduced. It can be minimized. Further, even if the self-propelled trolley switches between forward and backward movement, it can travel smoothly.

[Brief description of drawings]

FIG. 1 is a front view showing a wheel portion of a first embodiment of a self-propelled carriage according to the present invention.

2 is a partially cutaway side view showing the same portion of the first embodiment shown in FIG. 1. FIG.

FIG. 3 is a view taken along the line III-III in FIG. 1.

FIG. 4 is a partially cutaway side view showing a wheel portion of a second embodiment of the self-propelled carriage according to the present invention.

FIG. 5 is a side view showing a wheel portion of a conventional self-propelled carriage.

[Explanation of symbols]

 1 Wheel 2 Bearing 3 Rail 5 Linear Guide 6 Axis 7 Bearing 8 Fixed Frame 9, 9 Stopper V Self-propelled Cart

Claims (1)

[Claims] 1. A wheel, which is rotatable about a vertical axis and slidably attached to a linear guide which is biased to maintain a posture perpendicular to the traveling direction. A self-propelled trolley.