JPH04224344A - Steel belt tension adjusting device - Google Patents

Abstract

PURPOSE:To remove repetitive stress on a steel belt, reduce the number of parts and provide a compact steel belt tension adjusting device in a power transmission device using the steel belt to transmit rotational driving force of a robot and/or the like without backlash. CONSTITUTION:Both edges of a leftward rotation transmitting belt 3 and a rightward rotation transmitting belt 4 made of steel are wound round a driving pulley 1 and a driven pulley 2 so as to be fixed, and three cylinders arranged so as to be brought into contact with the obverse or the reverse of the leftward rotation transmitting belt 3 are provided, and the distance between the first cylinder 5 and the third cylinder 7 is adjusted by means of a tension adjusting bolt 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the tension of a steel belt in a power transmission mechanism using a steel belt that transmits rotational driving force such as a robot without backlash.

0002

[Prior Art] Conventionally, means for adjusting the tension of a steel belt include changing the winding angle of the steel belt around a pulley, and installing another pulley between two pulleys whose position can be adjusted in a direction perpendicular to the belt. There are some that change the distance between the axes of the two pulleys.

As an example, a device equipped with a tension adjustment pulley will be described with reference to FIGS. 3 and 4.

As shown in the figure, a drive pulley 9 is fixed to the drive shaft, a driven pulley 10 is fixed to the driven shaft, and a steel belt 11 transmitting leftward rotation between the drive pulley 9 and the driven pulley 10, and a right A steel belt 12 that transmits directional rotation is stretched. The tension adjustment pulley 13 is rotatably attached to the shaft 14 by a bearing 15, and the position of the shaft 14 can be changed in a direction perpendicular to the belt 11 by a tension adjustment bolt 16.

The reason why two steel belts 11 and 12 are used here is to widen the range of rotational motion. By adjusting the position of the tension adjustment pulley 13 using the tension adjustment bolt 16 and tensioning the left rotation transmission belt 11, the right rotation transmission belt 12 can be tensioned.

[0006]

[Problems to be Solved by the Invention] However, in the above-described configuration, since the position of the left rotation transmission belt 11 in contact with the tension adjustment pulley 13 changes, the left rotation transmission belt 11 has a curvature of the tension adjustment pulley 13. Bending causes repeated stress. Therefore, in order to keep the repeated stress applied to the left rotation transmission belt 11 within the fatigue limit, it is necessary to make the diameter of the tension adjustment pulley 13 as large as that of the drive pulley 9 and the driven pulley 10. When used in robots, etc., there is a problem in reducing the weight of the device. Also,
The number of parts also increases.

[0007] In addition, in other conventional methods of changing the amount of belt wrapping around the pulley, it is necessary to separate one of the driving pulley and the driven pulley into upper and lower parts and to have a mechanism for twisting the upper and lower pulleys, which increases the number of parts. .

The present invention solves the above problems and aims to provide a steel belt tension adjustment device that is compactly constructed with a small number of parts.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the steel belt tension adjustment device of the present invention includes a pulley provided on each of a drive shaft and a driven shaft, and both ends wound around each of the pulleys. A fixed steel belt, a first cylinder arranged in contact with the front or back side of the steel belt, and the first cylinder is in contact with the steel belt through the steel belt, and the steel belt is arranged around half a circumference or more. The second cylinder is in contact with the second cylinder via a steel belt, and the distance between the third cylinder and the first cylinder is adjusted in the opposite direction to the first cylinder. It is equipped with a bolt.

0010

[Operation] In the above-described structure, the present invention moves the three cylinders together with the movement of the belt, so that the bending stress due to the curvature of the cylinders does not act as repetitive stress. Therefore, the diameter of the cylinder can be reduced. In addition, the tension of the steel belt can be adjusted with a simple configuration of only three cylinders and adjustment bolts.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the steel belt tension adjustment device mechanism of the present invention will be described below with reference to FIG.

In the figure, 1 is a drive pulley fixed to a drive shaft, 2 is a driven pulley fixed to a driven shaft, and a steel belt 3 is connected to the drive pulley 1 and driven pulley 2 to transmit leftward rotation. Both ends of a steel belt 4 that transmits rotation in the right direction are wrapped and fixed. A part of the steel belt 3 between the driving pulley 1 and the driven pulley 2 is connected to a second part of the steel belt 3 located outside the tension line of the steel belt 3 through the closely corresponding first and third cylinders 5 and 7. It is wound half way around the cylinder 6. The distance between the first cylinder 5 and the third cylinder 7 is adjusted with a bolt 8, and the tension of the belt 3 is adjusted.

Specifically, holes are bored in the upper and lower parts of the first cylindrical column 5 through which bolts pass, and tapped screws are cut in the upper and lower parts of the third cylindrical column 7. By pulling the first cylinder 5 and the third cylinder 7 together with the tension adjustment bolt 8, the three cylinders 5, 6, 7 are fixed, and the belt 3 is tightened to the three cylinders 5, 6, 7. Change the amount of wrapping,
Adjust the tension of belt 3.

[0014]

Effects of the Invention As is clear from the description of the embodiments above, the present invention has a simple structure and is compact by providing three cylinders wrapped around and fixed to a part of a steel belt and a tension adjustment bolt. A tension adjustment device can be obtained. In particular, since the tension adjustment member has a simple cylinder shape, no special processing is required and it can be constructed at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a steel belt tension adjustment device according to an embodiment of the present invention.

[Figure 2] Plan view of the tension adjustment section

[Figure 3] Perspective view of a conventional steel belt tension adjustment device

[Figure 4] Cross-sectional view of the tension adjustment pulley

[Explanation of symbols]

1 Drive pulley 2 Driven pulley 3 Left rotation transmission belt 4 Right rotation transmission belt 5 First cylinder 6 Second cylinder 7 Third cylinder 8 Tension adjustment bolt

Claims (1)

[Claims] Claim 1: A pulley provided on each of a driving shaft and a driven shaft, a steel belt fixed by wrapping both ends around each of the pulleys, and a second belt disposed in contact with the front or back of the steel belt. The first cylinder is in contact with the first cylinder through a steel belt, and the second cylinder is arranged by wrapping the steel belt around half a circumference or more, and the second cylinder is in contact with the first cylinder through a steel belt. A steel belt tension adjustment device comprising a third cylinder arranged in the opposite direction to the cylinder, and a bolt that adjusts the distance between the first cylinder and the third cylinder.