JP2584365Y2 - Transmission band tension adjustment device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission band tension adjusting device used for adjusting the tension of a transmission band bridged between a driving vehicle and a driven vehicle.

[0002]

2. Description of the Related Art As a conventional tension adjusting device, a structure shown in FIG. 4 and a structure shown in FIG. 5 are known.
That is, in the first conventional structure shown in FIG. 4, the driving vehicle 50 and the driven vehicle 51 have the endless belt 5 as a transmission band.
2 between the driving vehicle 50 and the driven vehicle 51, the forward belt 53 and the backward belt 54.
Are formed. Further, one idler 55 is disposed between the driving wheel 50 and the driven wheel 51, and the idler 55 is urged by an urging member 56 such as a spring.
It is in pressure contact with the inner surface of the return belt portion 54.

On the other hand, the second conventional structure shown in FIG. 5 is provided with two idlers 55, 55 which are in contact with the outer surfaces of the forward belt portion 53 and the backward belt portion 54, respectively. Both idlers 55 are urged by urging members 56 in a direction in which they come close to each other, and are pressed against the outer side surface.

[0004]

However, in the first conventional structure, the idler 55 is pressed against the inner side surface of the return-side belt portion 54, and only the return-side belt portion 54 is pulled. ing. For this reason, the urging member 56
When the position of the idler 55 that is pulled by the belt changes, only the path length of the return side belt portion 54 changes, so that an error occurs in the change of the path length of the two belt portions 53 and 54, whereby the driving vehicle 50 Synchronization with the driven vehicle 51 is lost.

On the other hand, in the second conventional structure, since the two belt portions 53, 54 are pressed in the direction in which the two belt portions 53, 54 come close to each other by the two idlers 55, 55, the tension adjustment range is limited to the both belt portions 53, 54. Are possible only in a range where they do not touch each other, and the tension adjustment range is small.

In order to enable the tension adjustment within this small adjustment range, an endless belt 5 having a small play allowance is required.
Since it is necessary to use No. 2, it is difficult to bridge the endless belt 52 between the driving vehicle 50 and the driven vehicle 51 at the time of belt replacement. Therefore, in order to easily perform the bridging work at the time of belt replacement, one of the driving vehicle 50 and the driven vehicle 51 must be movable, and the distance between the two must be reduced. Further, both idlers 55, 55 do not always move with the same amount of movement, and only one idler 55 may move momentarily. Similarly, the driving vehicle 50 and the driven vehicle 51 are out of synchronization with each other, so that the synchronization is not compensated.

The present invention has been made in view of such a conventional problem, and ensures synchronization between a driving vehicle and a driven vehicle, a sufficient tension adjustment range, and the shaft of the driving vehicle and the driven vehicle. It is an object of the present invention to provide a transmission band tension adjusting device capable of exchanging the transmission band without changing the distance.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a driving band is bridged between a driving vehicle and a driven vehicle, and the driving force of the driving vehicle is transmitted through the driving band to the driven vehicle. In the power transmission mechanism, a rotatable support centered on the center between the forward side and the backward side of the transmission belt extending between the driving vehicle and the driven vehicle is provided, and the support is provided on the support. Is the proximal end
Are connected to each other and extend along four orthogonal lines.
And a pair of arms extending on the same straight line.
At the tip of the arm,
The outer idler that comes into contact with the other pair of arms is
Inner idler that abuts the inner surface of the forward and return sides
Each of the idlers is pressed against the inner surface and the outer surface by biasing the support in a predetermined direction, while being supported by the same distance from the center of rotation. There is provided an urging means.

[0009]

In the above construction, when the support is rotated by receiving the urging force from the urging means, the pair of outer idlers move together with the support and press the respective idlers against the outer surfaces of the return side and the forward side of the transmission band. I do. Similarly, the pair of inner idlers also move together with the support and press against the inner surfaces of the return side and the forward side, respectively. At this time, the support is urged in one predetermined direction.
Since the pair of outer idlers and the inner idler are each supported by an equal distance from the center of rotation of the support, the pair of inner idlers and the outer idler can reduce the distance by rotating the support. It moves in the same rotation direction at the same distance on the circumference of the radius. Therefore, the forward path side section and the return path side section always have the same displacement amount and the same
It is displaced in the rotational direction, and as a result, the path lengths of the forward and return sides are always the same. Also, as described above,
And the return side are always in the same rotation with the same displacement.
As a result of being displaced in the direction
Is the area of contact between the driving band and the driven and driven vehicles
The cost is always kept constant.

Further, since the inner side surface and the outer side surface of the forward side and the return side are pressed by the outer idler and the inner idler, respectively, and the tension is adjusted, a sufficient tension adjustment range is ensured. As a result, a sufficient tension adjustment range is ensured, so that necessary tension adjustment can be performed even when a transmission band having a large allowance for play is used.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. That is, the embodiment shown in FIGS. 2 and 3 is an application of the present invention to a locator, and a drive vehicle 2 and a driven vehicle 3 are rotatably supported on a locator body 1 at intervals. The center axis of the driving wheel 2 is connected to the rotation axis of the motor 12. An endless belt 4 serving as a transmission belt is stretched between the driving vehicle 2 and the driven vehicle 3, and between the driving vehicle 2 and the driven vehicle 3, a forward belt portion 5, which is a forward side portion of the endless belt 4. And a return-side belt portion 6, which is a return-side portion, extends.

A support 8 is provided between the drive vehicle 2 and the driven vehicle 3, and the support 8 is located at the center between the forward belt 5 and the backward belt 6, in other words, as shown in FIG. Driving car 2 shown
Has a rotation center P on a straight line L connecting the axis of the driven vehicle 3 and the driven vehicle 3, and is rotatably supported by a shaft 7 having the rotation center P as an axis. Also, a straight line perpendicular to the support 8
Four arms 9 extending upward are provided .
The base ends of the drum 9 are connected to each other. These four a
Arm 9, one pair of arms extending on the same straight line.
The tip of each of the drums 9 and 9 are equal to each other from the rotation center P.
The outer idlers 10 and 10 are respectively supported at positions corresponding to the distances.
And the other pair of arms extending on the same straight line
Similarly, at the tip of 9, 9, the above-mentioned
The inner idlers 11 and 11 are turned at positions where
It is pivotally supported.

One of the pair of outer idlers 10, 10 is disposed outside the outward belt 5 so as to contact the outer surface of the outward belt 5, and the other of the pair of outer idlers 10, 10 is connected to the outward belt 5. It is disposed outside the return-side belt portion 6 so as to contact the outer side surface. Similarly, one of the pair of inner idlers 11, 11 is disposed inside the outward belt portion 5 so as to contact the inner surface of the outward belt portion 5, and the other is the inner surface of the backward belt portion 6. And is disposed inside the return-path-side belt portion 6 so as to come into contact therewith.

An extended portion 13 is integrally formed at the tip of each of the adjacent predetermined arms 9, 9 and an urging device 14 as an urging means is provided at the tip of the extended portion 13. Is pivoted at one end. The urging device 14 is provided with the extension 13
The other end is pivotally supported by the tip of a bracket 15 fixed to the locator body 1.

The urging device 14 has an urging force in a contracting direction. Therefore, the support 8 is shown in FIG.
In this case, the pair of outer idlers 10, 10 are pressed against the outer surfaces of the forward belt 5 and the backward belt 6, respectively, as schematically shown in FIG. The pair of inner idlers 11, 11 is the forward belt 5
And the inner surface of the return belt 6.

In this embodiment having the above construction, when the support 8 is rotated by receiving an urging force from the urging device 14, the idlers 10, 10, 11, and 10 are rotated together with the rotation of the support 8.
11 is moved to press the outer idlers 10 and 10 against the outer surfaces of the respective belt portions 5 and 6, while the inner idlers 11 and 11 are pressed against the inner surfaces of the respective belt portions 5 and 6. Then, the tension of the endless belt 4 is adjusted.

[0017] At this time, the support 8, as described above FIG. 2
It is rotationally biased clockwise in, and support 8
Is a pair of outer idlers 10, 10 and inner idler 11,
11 is pivotally supported at the same distance from the rotation center P of the support 8, so that all the idlers 10, 10, 11, 11 rotate the distance to the rotation center P when the support 8 rotates. Move on the same circumference with the same distance.
Therefore, the endless belt 4 is always displaced by the same amount of displacement in the forward belt 5 and the backward belt 6. As a result, the path lengths of the two belt portions 4 and 5 always change in the same rotation direction with the same change amount, so that even if the tension changes, the synchronization between the driving vehicle 2 and the driven vehicle 3 completely coincides. . Also, as described above, the forward path side belt
Section 5 and the return belt section 6 always have the same displacement amount.
As a result, the driving wheel 2 and the driven wheel 3 are displaced in the same rotational direction.
Of the endless belt 4 spanned by the driving wheel 2
The contact area, which is the contact area with the car 3, is always kept constant
Is done. Therefore, with the adjustment of the tension, the support 8
Stable power without being affected by rotation
Can be transmitted.

Further, in each of the forward belt 5 and the backward belt 6, the outer idler 10 presses the outer side and the inner idler 11 presses the inner side.
Since the endless belt 4 is displaced at the portions, the endless belt 4 as a whole is displaced at the four portions, whereby a sufficient tension adjustment range can be secured.

Furthermore, if a sufficient tension adjustment range is secured as described above, there is no need to use an endless belt having a small allowance as in the above-described second prior art, and use an endless belt 4 having a large allowance. The tension can be adjusted without any problem. Therefore, the endless belt 4 with a large play allowance
By using the structure, the work of bridging the endless belt 4 between the driving vehicle 2 and the driven vehicle 3 at the time of belt replacement becomes easy without providing a structure capable of changing the center distance between the driving vehicle 2 and the driven vehicle 3. Therefore, it is not necessary to provide a structure capable of changing the distance between the axle of the driving vehicle 2 and the driven vehicle 3, thereby simplifying the structure, securing the above-described accurate synchronization, and securing a sufficient tension adjustment range. Becomes possible.

[0020] Incidentally, although the one using an endless belt 4 as transmission belt in this embodiment, it is also possible to provide a transmission belt such as an endless chain not limited thereto.

[0021]

As described above, according to the present invention, the forward side and the backward side of the transmission belt extending between the driving vehicle and the driven vehicle are integrally turned around the center therebetween as the rotation center. Move,
Four eyes provided at equal distances from the center of rotation
By Dora, predetermined inside and outside of the opposing position
It was pressed in one direction . Therefore, the tension can be adjusted while always displacing in the same rotation direction with the same amount of displacement between the forward side and the backward side of the transmission belt. As a result, the path lengths of both belt portions are always the same. It is possible to completely change the synchronization between the driving vehicle and the driven vehicle by changing with the change amount. Also, as described above,
And the return side are always in the same rotation with the same displacement.
As a result of being displaced in the direction
Is the area of contact between the driving band and the driven and driven vehicles
The cost can always be kept constant. The result
As a result, the support rotates as the tension of the drive belt is adjusted.
Also transmit stable power without being affected by this.
I can.

In addition, since the transmission band can be displaced by the pressing from the outside and the pressing from the inside on the forward side and the backward side, the transmission band is displaced at four positions, thereby providing a sufficient tension adjustment range. Can be secured.

If a sufficient tension adjustment range is secured in this manner, it is not necessary to use a transmission band having a small allowance, and the tension can be adjusted without any trouble even if a transmission band having a large allowance is used. Therefore, by using the transmission belt having a large play allowance, the replacement operation of the transmission belt becomes easy even if the structure in which the center distance between the driving vehicle and the driven vehicle can be changed is not used. This makes it possible to ensure accurate synchronization and a sufficient tension adjustment range while simplifying the structure.

[Brief description of the drawings]

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

FIG. 2 is a front view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a conceptual diagram showing a first conventional structure.

FIG. 5 is a conceptual diagram showing a second conventional structure.

[Explanation of symbols]

 Reference Signs List 2 Drive car 3 Follower car 4 Endless belt (drive band) 5 Outgoing belt part (outgoing side part) 6 Incoming belt part (returning side part) 7 Axis 8 Support 10 Outer idler 11 Inner idler 14 Biasing device (with Force means) P center of rotation

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A drive belt is bridged between a driving vehicle and a driven vehicle,
In a transmission mechanism for transmitting a driving force of a driving vehicle to a driven vehicle via the transmission band, a rotation center is set at a center between a forward path side portion and a return path side portion of a transmission band extending between the driving vehicle and the driven vehicle. rotatable support are mounted on the said support, mutually proximal portion
Are connected to each other and extend on an orthogonal straight line.
And a pair of arms extending on the same straight line.
The tip is in contact with the outer surface of the forward side and the return side.
Outer idler, the other pair of arms has
And the inner idler that contacts the inner surface of the
A biasing means is provided which is pivotally supported at an equal distance from the center of rotation and biases the support in a predetermined direction to press the idlers against the inner and outer surfaces. A transmission band tension adjusting device, characterized in that: