JPH11321358A - Driving unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the difference-in-level running capability by enabling a driving unit for a mobile dolly to run over a stepped floor surface. SOLUTION: This driving unit is equipped with a mounting frame 1, a movable bracket 2 supported by the mounting frame 1 in such a way that it can be longitudinal moved, an auxiliary wheel 7 rotatably supported, a wheel 5 rotatably supported by the movable bracket 2, a driving means 3 driving the wheel 5, a rotation transmission means transmitting the rotation of the wheel 5 to the auxiliary wheel, and position restoring means 6a and 6b restoring the movable bracket 2 to a place close to the center. Since the wheel 5 is kept at the center by the position restoring means 6a and 6b in a place with a step, no power is transmitted to the auxiliary wheel 7, and without contributing to running. In a place with a step, when the wheel 5 comes in contact with the step, the wheel 5 is moved in the direction opposite to the advancing direction by external force, rotation is transmitted to the auxiliary wheel 7 by the rotation transmitting means, and concurrently, the hanging of the auxiliary wheel 7 onto the step, allowing the wheel to easily ride over the step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a plant, a building,
The present invention relates to a drive unit used for a mobile trolley used as a means for transporting goods such as products and raw materials in an underground mall or the like.

[0002]

2. Description of the Related Art Conventionally, a drive unit of a mobile trolley used as a means for transporting goods such as products and raw materials in factories, buildings, underground shopping centers, and the like, as shown in FIG. The motor 5 as a driving means which is supported and fixed to the mounting frame 51
The wheel 52 is driven by rotating the motor 53 by connecting the rotating shaft 3 and the wheel 52.

[0003]

However, when the present invention is applied to a mobile trolley using a drive unit according to the prior art and travels, when a step or the like exists on the floor, if the step is small or the traveling speed is sufficient, If the step is larger than a certain level or the traveling speed is slow, the wheels cannot slide and run. SUMMARY OF THE INVENTION An object of the present invention is to realize a drive unit that can run even when the floor surface has some steps and the running speed is low.

[0004]

According to the first aspect of the present invention, a box-shaped mounting frame, a movable bracket supported on the side surface of the mounting frame so as to be able to move back and forth, a position returning means provided at the front and rear of the movable bracket, A wheel rotatably supported by a movable bracket, and driving means for driving the wheel,
An auxiliary wheel rotatably supported on the side opposite to the movable bracket of the mounting frame, and rotation transmitting means for transmitting rotation of the wheel to the auxiliary wheel are provided.

According to a second aspect of the present invention, in the driving unit of the first aspect, a driving unit for independently driving the auxiliary wheels is provided instead of the rotation transmitting unit for transmitting the rotation of the wheels to the auxiliary wheels.

In the drive unit having the structure of the first aspect, the movable bracket is located near the center of the mounting bracket by the position return means on the floor surface having no step.
The wheels are rotated by the driving source and normal traveling is possible. When a step or the like exists on the floor surface, when the wheel comes into contact with the step, the reaction force causes the movable bracket to move in the opposite direction to the traveling direction, and the auxiliary wheel is rotated by the rotation transmitting means. As a result, the projection of the auxiliary wheel is applied to the step, so that the step can be overcome and the vehicle can travel. Further, after the auxiliary wheel and the wheel have climbed over the step, the reaction force from the step disappears, so that the movable bracket returns to the vicinity of the center of the mounting bracket again by the position return means, and travels normally. As described above, the drive unit can easily run even if there is a step on the floor. Further, in the configuration of claim 2, since the auxiliary wheel is rotated by a drive source different from the wheel, the rotational force is always transmitted, which is more preferable.

[0007]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing an embodiment of claim 1, and FIGS. 2 and 3 are diagrams for explaining the operation.
In FIG. 1, a movable bracket 2 is movably supported on one side surface of a box-shaped mounting frame 1 in the front-rear direction. A wheel 5 is rotatably supported inside the movable bracket 2, and a motor or the like as driving means 3 of the wheel 5 is fixed to the outside, and an output shaft of the driving means is connected to a rotating shaft 4 of the wheel 5. By driving the driving means 3, the wheels 5 rotate.

Before and after the movable bracket 2, springs 6a and 6b are provided as position return means. Near the center of the lower part of the side of the mounting frame opposite to the movable bracket side, there are irregularities on the circumference and an auxiliary wheel 7 having the same or slightly smaller diameter than the wheel 5 and inner pulleys 8a and 8b as rotation transmitting means. , Rotating shafts 9a, 9b, outer pulley 10a,
10b are rotatably supported. At this time, the inner pulley 8
a, when the movable bracket 2 is located at the center of the mounting frame 1, it does not come into contact with the wheels 5 and when the movable bracket 2 moves forward (to the right in the drawing), the wheels 5
It is arranged at the position where it contacts. On the other hand, when the movable bracket 2 is located at the center of the mounting frame 1, the inner pulley 8 b does not contact the wheels 5 and contacts the wheels 5 when the movable bracket 2 moves rearward (leftward in the figure). To place. Rotary shaft 9 of each pulley 8a, 8b
a and 9b penetrate the side surface of the mounting frame 1 to the outside and fix the outer pulleys 10a and 10b. The transmission pulley 11 is fixed to the side surface of the auxiliary wheel 7 and is brought into contact with the outer pulleys 10a and 10b.

When the auxiliary wheel 7 travels on a floor surface having no steps as shown in FIG. 1, the movable bracket 2 is held near the center of the mounting frame 1 by the springs 6a and 6b. At this time, the wheels 5 do not rotate because the inner pulleys 8a and 8b do not contact each other. As a result, normal traveling using only the wheels 5 becomes possible. On the other hand, as shown in FIG. 2, when the wheel 5 comes into contact with a step or the like and a reaction force is applied, and the movable bracket 2 moves forward (right in the figure), the wheel 5 comes into contact with the inner pulley 8a,
The auxiliary wheel 7 rotates via the rotation shaft 9a, the outer pulley 10a, and the transmission pulley 11. As a result, the projection of the auxiliary wheel 7 can be caught by the step and can travel through the step. If the vehicle travels over the step, the reaction force due to the step is not applied to the wheel 5, so that the movable bracket 2 is returned to the vicinity of the center of the mounting frame 1 again by the springs 6a and 6b, thereby enabling normal traveling. On the contrary, as shown in FIG. 3, when the wheel 5 comes into contact with a step or the like and a reaction force is applied to move the movable bracket 2 rearward (left in the figure), the wheel 5 comes into contact with the inner pulley 8b, The auxiliary wheel 7 rotates via the rotation shaft 9b, the outer pulley 10b, and the transmission pulley 11. As a result, the projection of the auxiliary wheel 7 can be caught by the step and can travel through the step. If the vehicle travels over the step, the reaction force due to the step is not applied to the wheel 5, so that the movable bracket 2 is returned to the vicinity of the center of the mounting frame 1 again by the springs 6a and 6b, thereby enabling normal traveling.

FIG. 4 is a diagram showing a second embodiment of the present invention. Hereinafter, portions different from the first embodiment will be described. In the present invention, the inner pulleys 8a and 8b, the rotating shafts 9a and 9b, the outer pulleys 10a and 10b, which are provided as rotation transmitting means for transmitting the rotation of the wheels 5 of the embodiment of FIG.
Instead of b, a drive means 12 is provided as a drive means for independently driving the auxiliary wheels on the inner side of the side surface of the mounting frame 1 supporting the wheels 5, and an outer pulley 13 fitted to the rotating shaft of the drive means is provided. At this time, the outer pulley 13 and the transmission pulley 11 are arranged to be in contact with each other. By driving the driving means 12, the auxiliary wheel 7 rotates via the outer pulley 13 and the transmission pulley 11. The operation of the wheels 5 and the auxiliary wheels 7 is the same as that of the first embodiment except that the auxiliary wheels 7 can be constantly rotated by being driven by the driving means 12.

In the embodiment shown in FIG. 1, the rotation of the wheel 5 is controlled by the inner pulleys 8a and 8b, the rotating shafts 9a and 9b, the outer pulley 10a,
10b, driving the auxiliary wheels 7 via the transmission pulley 11,
In the embodiment of FIG. 4, the rotation of the driving means 12 is controlled by the outer pulley 1.
3. Although the auxiliary wheels 7 are driven via the transmission pulley 11, these may use other rotation transmission means such as gears or timing belts.

As described above, in the movable trolley equipped with the drive unit of the present invention, the movable bracket is located near the center of the mounting bracket by the position return means on the floor surface having no step. The wheels rotate and normal running is possible. When a step or the like exists on the floor surface, when the wheel comes into contact with the step, the reaction force causes the movable bracket to move in the opposite direction to the traveling direction, and the auxiliary wheel is rotated by the rotation transmitting means. As a result, the projection of the auxiliary wheel is applied to the step, so that the step can be overcome and the vehicle can travel. Further, after the auxiliary wheel and the wheel have climbed over the step, the reaction force from the step disappears, so that the movable bracket returns to the vicinity of the center of the mounting bracket again by the position return means, and travels normally. As described above, the drive unit can easily run even if there is a step on the floor. In addition, since the auxiliary wheels are always driven by independently driving the auxiliary wheels by a drive source different from the wheels, a drive unit having more excellent stepping performance on a step is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of claim 1 of the present invention.

FIG. 2 is a diagram showing the operation of the first embodiment of the present invention.

FIG. 3 is a diagram showing another operation of the first embodiment of the present invention.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting frame 2 Movable bracket 3 Driving means 4 Rotating shaft 5 Wheel 6a, 6b Spring 7 Auxiliary wheel 8a, 8b Inner pulley 9a, 9b Rotating shaft 10a, 10b Outer pulley 11 Transmission pulley 12 Driving means 13 Outer pulley

Claims (2)

[Claims] 1. A box-shaped mounting frame, a movable bracket supported on a side surface of the mounting frame so as to be movable back and forth, position return means provided on the front and rear of the movable bracket, and a wheel rotatably supported by the movable bracket. A drive unit comprising: drive means for driving wheels; an auxiliary wheel rotatably supported on a side opposite to the movable bracket of the mounting frame; and rotation transmission means for transmitting rotation of the wheel to the auxiliary wheel. 2. The drive unit according to claim 1, wherein drive means for independently driving the auxiliary wheels is provided in place of the rotation transmitting means for transmitting the rotation of the wheels to the auxiliary wheels.