JP2022018193A - Flat belt transmission system - Google Patents

Abstract

To allow a belt to be reliably prevented with a simple structure from falling off during reverse rotation.SOLUTION: A flat belt transmission system 1 is provided with: a driving pulley 2; a driven pulley 3; a flat belt 6 wound around the driving pulley 2 and the driven pulley 3; a meandering control pulley 5 in contact with the flat belt 6, and for controlling meandering of the flat belt 6 by adjusting the inclination of a pulley shaft 7 during normal rotation; and a fall prevention guide roller 10 in contact with a side surface of the flat belt 6, and for preventing the flat belt 6 from falling off.SELECTED DRAWING: Figure 1

Description

The present invention relates to a flat belt transmission system with a meandering control pulley.

Conventionally, in a transmission system using a flat belt, the flat belt may meander during traveling or may travel to one side of the pulley. This is because the flat belt is more sensitive than other flat belts to the deviation of the pulley shaft from the normal position, the bending of the pulley shaft due to the change of the shaft load, and the shaking of the pulley. In order to prevent such meandering and offsetting, a flat belt meandering control device for preventing meandering of a flat belt is known (see, for example, Patent Document 1).

Further, as in Patent Document 2, a meandering control pulley having a one-way clutch is known.

Japanese Unexamined Patent Publication No. 2005-121205 Japanese Patent No. 6412293

In a flat belt transmission system having a fan such as a blower, the fan may rotate in the opposite direction (hereinafter referred to as reverse rotation) due to wind or the like. In such a case, as described above, the flat belt is easily displaced from the pulley, and when it is reversed, the flat belt moves in a meandering direction, the flat belt comes into contact with the flange of the pulley, and the side surface of the belt is damaged. In some cases, the flat belt may ride on the flange and fall off the pulley.

Further, there is a demand for a simple one that can prevent the clutch from falling off due to reverse rotation without providing a one-way clutch as in Patent Document 2.

The present invention has been made in view of this point, and an object of the present invention is to ensure that the belt can be prevented from falling off in reverse rotation with a simple structure.

In order to achieve the above object, in the present invention, a dropout prevention guide roller for preventing the flat belt from falling off during reverse rotation is provided.

Specifically, the flat belt transmission system of the first invention is
Drive pulley and
With the driven pulley,
A flat belt hung on the drive pulley and the driven pulley,
A meandering control pulley that comes into contact with the flat belt and adjusts the inclination of the pulley shaft during normal rotation to control the meandering of the flat belt.
It is provided with a dropout prevention guide roller that comes into contact with the side surface of the flat belt during reverse rotation and prevents the flat belt from falling off.

Normally, the meandering control pulley exerts a meandering prevention function of adjusting the inclination of the pulley shaft during normal rotation to prevent meandering of the flat belt. However, when the fan rotates in the reverse direction due to strong wind, etc., the function cannot be exerted due to the structure, and the meandering control pulley remains tilted in one direction, and the belt position shifts from that point, and finally. Leads to dropout. However, according to the above configuration, the fall prevention guide roller abuts on the side surface of the flat belt that is about to fall off during reverse rotation to prevent further movement in the falling direction, so that the flat belt does not fall off even during reverse rotation.

In the second invention, in the first invention,
The fall prevention guide roller is provided between the drive pulley and the driven pulley.
The flat belt is pulled on the tension side when the drive pulley rotates in the normal direction, or the flat belt is loosened or placed on the loosening side when the drive pulley rotates in the normal direction.
The meandering control pulley is arranged on the loose side of the drive pulley when it rotates in the normal direction.

According to the above configuration, the fall-off prevention guide roller comes into contact with the side surface of the flat belt on the tension side where the flat belt tends to fall off, so that the flat belt is surely prevented from falling off. Further, even if it is provided on the loose side, the effect of preventing the flat belt from falling off is exhibited.

In the third invention, in the second invention,
When viewed from the direction perpendicular to the axis of the driven pulley, the outer peripheral surface of the fall prevention guide roller is separated from the side surface of the flat belt in the normal position at the time of normal rotation by 5 mm or less, and the flat belt In the normal position, the side surface of the flat belt and the dropout prevention guide roller are configured so as not to come into contact with each other.

According to the above configuration, it is possible to prevent the flat belt from coming into contact with the fall prevention guide roller during normal rotation, but to come into contact with it during reverse rotation so that the belt position does not move further in the fall direction. Therefore, since the side surface of the flat belt comes into contact with the fall prevention guide roller only when necessary, the durability of the flat belt is unlikely to decrease. The normal position at the time of normal rotation means a traveling position where the flat belt does not meander (do not shift).

In the fourth invention, in the second or third invention,
The meandering control pulley is arranged at a position of 100 mm or less when viewed from the contact point between the flat belt and the driven pulley in the axial direction of the driven pulley.

According to the above configuration, the rigidity of the flat belt is maintained as long as it is not separated from the driven pulley more than necessary, and it is easy to hold the position of the flat belt.

In the fifth invention, in any one of the second to fourth inventions,
The fall prevention guide roller is also provided auxiliary on the driven pulley side between the driving pulley and the driven pulley.

According to the above configuration, the captive fall prevention guide roller further reliably prevents the flat belt from falling off.

As described above, according to the present invention, the fall prevention guide roller is brought into contact with the side surface of the flat belt at the time of reverse rotation, so that the belt can be reliably prevented from falling in the reverse rotation with a simple structure.

It is a perspective view which shows the outline of the belt transmission system which concerns on embodiment of this invention. It is a perspective view which shows the fall prevention guide roller and its periphery in an enlarged manner. It is a side view which shows the outline of the belt transmission system at the time of reversal. It is a side view which shows the outline of the belt transmission system at the time of normal rotation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a flat belt transmission system 1 according to an embodiment of the present invention. In each figure, the forward rotation direction is indicated by an arrow F, and the reverse rotation direction is indicated by an arrow R.

Although not shown in detail, this flat belt transmission system 1 is used as a drive system for, for example, a cooling tower, a blower, etc., and is connected to a drive pulley 2 driven by an actuator such as an electric motor and a rotation shaft such as a fan. A driven pulley 3 and a flat belt 6 hung on the driven pulley 3 are provided. The flat belt transmission system 1 is not limited to a blower, but is also used in an air conditioner, a compressor, and the like. In particular, unlike the belt transmission system attached to the output shaft of the engine, the system has no or almost no rotational fluctuation. The flat belt 6 has, for example, a core wire at the center in the thickness direction, and has a structure in which the core wire is sandwiched by the upper rubber and the bottom rubber. However, the type of the flat belt 6 is not particularly limited, the material and the like are not particularly limited, and a belt that easily meanders during traveling may be a target.

The flat belt transmission system 1 of the present embodiment includes a meandering control device 4 that controls the meandering of the flat belt 6 by adjusting the inclination of the meandering control pulley 5 that abuts on the transmission surface of the flat belt 6. The meandering control device 4 includes a base portion 4a attached to a blower or the like, and a tension arm 4c swingably supported by an arm support shaft 4b at one end of the base portion 4a, and the tension arm 4c has the meandering. A pulley shaft 7 that rotatably supports the control pulley 5 is provided. The meandering control pulley 5 is rotatably supported by a pulley shaft 7 via a bearing (not shown). Although detailed description is omitted (see Patent Documents 1 and 2 above), the meandering correction of the flat belt 6 is performed by adjusting the inclination of the pulley shaft 7 by tilting the pin orthogonal to the pulley shaft 7 to the center. It has become like. The tension arm 4c also functions as an auto tensioner by being urged by a predetermined pulling force by a pulling spring 4d provided on the other end side of the base portion 4a. The meandering control device 4 autonomously controls the traveling position of the flat belt 6 and stably maintains the tension applied by the tension spring 4d, so that the life of the flat belt 6 can be extended and maintenance-free can be achieved.

Then, as a feature of the present embodiment, as shown in an enlarged manner in FIG. 2, the flat belt transmission system 1 abuts on the side surface of the flat belt 6 and provides a fall prevention guide roller 10 for preventing the flat belt 6 from falling off. I have. The fall prevention guide roller 10 includes, for example, a columnar guide roller main body 11 and a guide roller support portion 12 that supports the roller rotation shaft 11a. For example, the guide roller support portion 12 is fixed to the blower main body on which the driven pulley 3 and the like are supported.

The fall prevention guide roller 10 is arranged between the drive pulley 2 and the driven pulley 3 on the tension side that pulls the flat belt 6 when the drive pulley 2 rotates in the normal direction. On the other hand, the meandering control pulley 5 is arranged on the loose side of the drive pulley 2 at the time of normal rotation.

Then, when viewed from a direction perpendicular to the axis of the driven pulley 3 (specifically, when viewed from the front of FIG. 4), the outer peripheral surface of the fall prevention guide roller 10 is normal when the flat belt 6 rotates in the normal direction. It is separated from the side surface at a suitable position by x = 5 mm or less. Then, in the normal position of the flat belt 6, the side surface of the flat belt 6 and the dropout prevention guide roller 10 are configured so as not to come into contact with each other. That is, the minimum distance x is maintained without being too far away than necessary.

The meandering control pulley 5 is arranged at a position where L = 100 mm or less when viewed from the contact point between the flat belt 6 and the driven pulley 3 in the axial direction of the driven pulley 3. This value of 100 mm is set from an experimental value in which a predetermined belt rigidity is maintained.

-Activation of flat belt transmission system-
For example, an example in which the flat belt transmission system 1 is used for the blower will be described.

When an electric motor or the like is driven, as shown in FIG. 4, the drive pulley 2 rotates in the forward rotation direction, and the driven pulley 3 rotates. This power causes the fan to rotate. Since the meandering control device 4 also has an auto tensioner function, the flat belt 6 is maintained at an appropriate tension by the tension of the tension spring 4d.

In the meandering control pulley 5, when the flat belt 6 meanders during such normal rotation, the pulley shaft 7 tilts around a pin orthogonal to the pulley shaft in a direction to return the meandering to prevent meandering. Demonstrate function. Then, the flat belt 6 is subjected to a return force (a force for returning the bias) due to the meandering control pulley 5 being in an oblique crossing state and a returning force due to the meandering control pulley 5 being tilted, whereby the flat belt 6 is flattened. The deviation of the belt 6 is prevented.

Since the outer peripheral surface of the fall prevention guide roller 10 is separated from the side surface of the flat belt 6 at the normal position at the time of normal rotation by 5 mm or less, it does not come into contact with the flat belt 6.

On the other hand, as shown in FIG. 3, the function cannot be exhibited at the time of reverse rotation in which the driven fan is rotated in the reverse direction by applying an external force due to a strong wind or the like at the time of stopping. For this reason, the meandering control pulley 5 remains tilted in one direction, and the belt position shifts from that point, which may eventually lead to falling off.

However, in the present embodiment, the fall prevention guide roller 10 abuts on the side surface of the flat belt 6 that is about to fall off during reverse rotation, and prevents further movement in the fall direction. Therefore, the flat belt 6 does not fall off even at the time of reversal.

In the present embodiment, the fall-off prevention guide roller 10 comes into contact with the side surface of the flat belt 6 on the tension side where the flat belt 6 tends to fall off, so that the flat belt 6 is surely prevented from falling off.

Further, the flat belt 6 can be brought into contact with the fall prevention guide roller 10 only during the reverse rotation without being brought into contact with the fall prevention guide roller 10 so that the belt position does not move further in the fall direction. That is, since the guide roller 10 is brought into contact with the fall prevention guide roller 10 only when necessary, the durability of the flat belt 6 is unlikely to decrease.

Further, since the fall prevention guide roller 10 is arranged at a position not so far from the driven pulley 3, the flat belt 6 abuts at a position where the rigidity is maintained and the flat belt 6 is prevented from falling off, so that the position of the flat belt 6 is maintained. It's easy to do.

Therefore, according to the flat belt drive device 1 according to the present embodiment, the fall-off prevention guide roller 10 comes into contact with the side surface of the flat belt 6 at the time of reverse rotation, thereby ensuring the meandering prevention function at the time of normal rotation. With a simple structure, it is possible to reliably prevent the belt from falling off in reverse rotation. As a result, the weakness peculiar to the meandering control device 4 can be eliminated.

-Modification example-
In the above embodiment, only one fall prevention guide roller 10 is provided on the tension side and the driven pulley 3 side, but for example, it is provided on the loosening side and the drive pulley 2 side in the area surrounded by A in FIG. May be good.

Further, the fall prevention guide roller 10 may be provided on the loose side and the driven pulley 3 side. Also in this case, the meandering control pulley 5 may be arranged at a position where L = 100 mm or less when viewed from the contact point between the flat belt 6 and the driven pulley 3 in the axial direction of the driven pulley 3. In this case, it may be provided on the tension side and the drive pulley 2 side in the area surrounded by B in FIG.

(Other embodiments)
The present invention may have the following configurations with respect to the above embodiment.

That is, the above embodiment is suitable for a flat belt transmission system 1 such as a blower having no particular rotation fluctuation, but can also be applied when there is some rotation fluctuation.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

1 Flat belt transmission system
2 Drive pulley
3 Driven pulley
4 Meander control device
4a base part
4b arm support shaft
4c tension arm
4d tension spring
5 Meander control pulley
6 flat belt
7 Pulley shaft
9 bearings
10 Falling prevention guide roller
11 Guide roller body
11a Roller rotation shaft
12 Guide roller support

Claims (5)

Drive pulley and
With the driven pulley,
A flat belt hung on the drive pulley and the driven pulley,
A meandering control pulley that comes into contact with the flat belt and adjusts the inclination of the pulley shaft during normal rotation to control the meandering of the flat belt.
A flat belt transmission system comprising a fall-off prevention guide roller that abuts on the side surface of the flat belt during reverse rotation and prevents the flat belt from falling off. In the flat belt transmission system of claim 1,
The fall prevention guide roller is provided between the drive pulley and the driven pulley.
The flat belt is pulled on the tension side when the drive pulley rotates in the normal direction, or the flat belt is loosened or placed on the loosening side when the drive pulley rotates in the normal direction.
The meandering control pulley is a flat belt transmission system characterized in that it is arranged on the loose side of the drive pulley when it rotates in the normal direction. In the flat belt transmission system of claim 2,
When viewed from the direction perpendicular to the axis of the driven pulley, the outer peripheral surface of the fall prevention guide roller is separated from the side surface of the flat belt in the normal position at the time of normal rotation by 5 mm or less, and the flat belt A flat belt transmission system characterized in that, in a normal position, the side surface of the flat belt and the dropout prevention guide roller are configured so as not to come into contact with each other. In the flat belt transmission system according to claim 2 or 3.
The meandering control pulley is a flat belt transmission system characterized in that the flat belt transmission system is arranged at a position of 100 mm or less when viewed from the contact point between the flat belt and the driven pulley in the axial direction of the driven pulley. In the flat belt transmission system according to any one of claims 2 to 4.
The flat belt transmission system is characterized in that the dropout prevention guide roller is provided between the drive pulley and the driven pulley on the driven pulley side as an auxiliary.

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