JP2021032262A - Belt drive mechanism and automatic door device - Google Patents

Abstract

To provide a belt drive mechanism capable of preventing occurrence of noise due to contact of a toothed belt with a flange of a drive pulley even in a long-term use, and an automatic door device into which the belt drive mechanism is incorporated.SOLUTION: A belt drive mechanism comprises: an elastic toothed belt 40 with a square cross section; a drive pulley 20 in which a tooth tip surface 22a and a tooth bottom surface 22b have the same curved surface shape in which the height gradually decreases from both end parts 20a and 20a toward a center part 20b so that the center part 20b having a width from both end parts 20a and 20a in the direction of an axis 23 is the lowermost bottom, and which transmits power of a drive motor 10 by engagement to the toothed belt 40 which is annularly bridged with a driven pulley 30.SELECTED DRAWING: Figure 3

Description

The present invention relates to a belt drive mechanism using a toothed belt for power transmission and an automatic door device incorporating the belt drive mechanism.

Conventionally, a belt drive mechanism, which is a drive mechanism using a toothed belt for power transmission, is used, for example, for opening / closing a door of an automatic door device, and is connected to a drive motor via a power transmission mechanism with a drive pulley. , A driven pulley that is spaced apart from the drive pulley, and a toothed belt that is annularly bridged between the drive pulley and the driven pulley (see, for example, Patent Document 1).

In the toothed belt described in Patent Document 1, both ends are connected by a belt connecting tool, and the tension can be adjusted by using the tension adjusting mechanism of the belt connecting tool.

As shown in FIG. 11, such a belt drive mechanism 500 has a toothed belt on the inner peripheral surface of the drive pulley 600 on which the toothed belt 700 is hung in order to efficiently transmit power to the toothed belt 700 by the drive pulley 600. A plurality of teeth 610 that mesh with 700 teeth 710 are formed.
Further, the drive pulley 600 is formed with a pair of flanges 620 and 620 raised substantially perpendicular to the groove inner peripheral surface at both ends in the axial direction.
The pair of flanges 620 and 620 come into contact with the end face 700a of the toothed belt 700 when the toothed belt 700 being driven in rotation moves toward one end of the drive pulley 600, thereby causing the toothed belt 700. It functions to prevent the 700 from coming off the drive pulley 600.

Japanese Unexamined Patent Publication No. 2019-23423

However, the conventional belt drive mechanism is affected by the mounting state of each part, the structural tolerance, the imbalance of the load applied to the toothed belt by the belt connecting tool described in Patent Document 1, and the like. As a result, the toothed belt is rotated in a state of being biased to the position on one flange side, and it rubs against the flange and deteriorates over time, causing a problem that an abnormal noise is generated when the end face of the toothed belt comes into contact with the flange. there were.

As a means for solving such a problem, it is conceivable to apply a surface treatment to the toothed belt to reduce the friction between the end face of the toothed belt and the flange.
However, there is a problem that it is difficult to obtain a long-term effect because the effect of the surface treatment of the toothed belt is lowered due to the deterioration of the toothed belt over time.

The present invention has been made in view of the above, and is a belt drive mechanism capable of preventing generation of abnormal noise due to contact of the toothed belt with the flange of the drive pulley even in long-term use, and a belt drive. It is an object of the present invention to provide an automatic door device incorporating a mechanism.

In order to solve the above-mentioned problems and achieve the object, the belt drive mechanism according to the present invention has an elastic toothed belt having a quadrangular cross section, and the tooth tip surface and the tooth bottom surface are shafts from both ends on the flange side. It has the same curved shape in which the height gradually decreases from both ends toward the center so that the center of the width in the direction is at the bottom, and the power of the drive motor is annularly connected to the driven pulley. It is characterized by having a drive pulley that meshes with and transmits the toothed belt to be bridged.

Further, the belt drive mechanism according to the present invention is characterized in that, in the above invention, the tooth tip surface and the tooth bottom surface have an arcuate curved surface shape.

Further, in the belt drive mechanism according to the present invention, in the above invention, the drive pulley has a shaft arranged parallel to the shaft of the drive motor and is inside the tip surface in the axial direction of the drive motor. It is characterized in that the width in the axial direction required for forming the curved shape of the tooth tip surface and the tooth bottom surface is set by using the axial space.

Further, in the belt drive mechanism according to the present invention, in the above invention, the driven pulley has the tooth tip surface and the tooth bottom surface of the driven pulley at the center of the width in the axial direction from both ends on the flange side of the driven pulley. It is characterized in that it has the same curved surface shape in which the height gradually decreases from both ends of the driven pulley toward the center of the driven pulley so that

Further, in the belt drive mechanism according to the present invention, in the above invention, the groove inner peripheral surface of the groove on which the driven pulley hangs the toothed belt has a width in the axial direction from both ends in the axial direction of the driven pulley. It has a curved shape formed so that the height gradually decreases from both ends toward the center so that the center is at the bottom, and the inner peripheral surface of the groove is rotationally driven with the drive pulley. It is characterized in that the toothed belt rotated between the belts has a curved shape so as not to come off from both ends of the driven pulley.

Further, the belt drive mechanism according to the present invention is characterized in that, in the above invention, the toothed belt is formed in an annular shape by connecting both ends with a belt connecting tool.

In order to solve the above-mentioned problems and achieve the object, the automatic door device according to the present invention incorporates the above-mentioned belt drive mechanism, and the door is connected to the toothed belt of the belt drive mechanism. The door is opened and closed.

Further, in the automatic door device according to the present invention, in the above invention, the belt drive mechanism is housed in the axial tip side of the drive motor and the drive pulley toward the opening to which the cover is attached, and the opening side. It is characterized by having an engine base in which the opening is formed at a position where the cover is attached without interfering with the axial dimension of the drive motor, which is a part of the belt drive mechanism most protruding from the above. And.

The belt drive mechanism according to the present invention is described above so that the toothed belt having an elastic square cross section and the tooth tip surface and the tooth bottom surface are at the bottom at the center of the axial width from both ends on the flange side. With a drive pulley that has the same curved shape in which the height gradually decreases from both ends toward the center, and the power of the drive motor is meshed with and transmitted to the toothed belt that is annularly bridged with the driven pulley. Therefore, when the toothed belt is rotated in a state of being annularly bridged between the drive pulley and the driven pulley while holding a predetermined tension, the tip of the tooth which is a convex portion. The surface follows the curved tooth bottom surface of the drive pulley, and the concave surface follows the curved tooth tip surface of the drive pulley, so that the tooth tip surface and the bottom of the tooth bottom surface of the drive pulley are met. A force is applied to return to the central part in the width direction.
Therefore, even if the toothed belt moves toward one end of the drive pulley during rotation, that is, toward one of the flanges, it is returned to the central portion, which is the bottom, so that the belt does not rub against the flange. Can be.
Therefore, the belt drive mechanism according to the present invention can prevent the generation of abnormal noise due to the toothed belt coming into contact with the flange of the drive pulley even in long-term use.

Since the automatic door device according to the claim of the present invention incorporates the above-mentioned belt drive mechanism, the same effect as the above-mentioned belt drive mechanism can be obtained.

FIG. 1 is a schematic view of an automatic door device according to a first embodiment of the present invention. FIG. 2 is a view of the periphery of the belt drive mechanism viewed from the upper surface side, and is a partial cross-sectional view. FIG. 3 is a perspective view showing the periphery of the drive pulley of the belt drive mechanism. FIG. 4 is a cross-sectional view of a main part of the drive pulley. FIG. 5 is a front view showing the periphery of the drive pulley of the belt drive mechanism, and is a view in which the flange of the drive pulley is omitted. FIG. 6 is a diagram showing a part of the toothed belt. FIG. 7 is a perspective view showing the periphery of the belt connecting tool of the toothed belt in a state where both ends are connected. FIG. 8 is a view of the periphery of the belt drive mechanism of the modified example 1 as viewed from the upper surface side, and is a partial cross-sectional view. FIG. 9 is a perspective view showing the periphery of the drive pulley of the belt drive mechanism of the modified example 2. FIG. 10 is a perspective view showing the periphery of the driven pulley of the belt drive mechanism of the second embodiment. FIG. 11 is a perspective view showing the periphery of the driven pulley of the belt drive mechanism of the third embodiment. FIG. 12 is a diagram for explaining a problem of the prior art.

Hereinafter, preferred embodiments of the belt drive mechanism according to the present invention and the automatic door device incorporating the belt drive mechanism will be described in detail with reference to the drawings.

FIG. 1 is a schematic view of an automatic door device 100 according to a first embodiment of the present invention. FIG. 2 is a view of the periphery of the belt drive mechanism 1 viewed from the upper surface side, and is a partial cross-sectional view. FIG. 3 is a perspective view showing the periphery of the drive pulley 20 of the belt drive mechanism 1. FIG. 4 is a cross-sectional view of a main part of the drive pulley 20. FIG. 5 is a front view showing the periphery of the drive pulley 20 of the belt drive mechanism 1, and is a view in which the flange 21 of the drive pulley 20 is omitted. FIG. 6 is a diagram showing a part of the toothed belt 40. FIG. 7 is a perspective view showing the periphery of the belt connecting tool 50 of the toothed belt 40 in a state where both ends are connected.
In FIG. 1, the automatic door device 100 is in a state in which the cover 121 of the engine base 120 is removed so that the belt drive mechanism 1 housed inside the engine base 120 can be visually recognized.
The belt drive mechanism 1 according to the embodiment of the present invention uses a toothed belt 40 for power transmission.
Further, in the automatic door device 100 according to the embodiment of the present invention, the belt drive mechanism 1 is incorporated, and the belt drive mechanism 1 opens and closes the door 140 connected to the toothed belt 40.

The automatic door device 100 includes a main body frame 110, a belt drive mechanism 1, an engine base 120 that houses the belt drive mechanism 1, and a door 140 that is opened and closed by the belt drive mechanism 1.

The body frame 110 is made of, for example, aluminum and forms the skeleton of the device.
Each component of the automatic door device 100, such as the engine base 120, is fixed to the main body frame 110.

As shown in FIG. 2, the belt drive mechanism 1 drives the drive motor 10, the reduction mechanism 11, the drive pulley 20 connected to the drive motor 10 via the power transmission mechanism of the reduction mechanism 11, and the driven pulley 30. It has a toothed belt 40 that is annularly bridged between the pulley 20 and the driven pulley 30.

The drive pulley 20 is made of metal, and a plurality of teeth 22 that mesh with the teeth 42 of the toothed belt 40 are formed along the circumferential direction on the circumferential surface on which the toothed belt 40 is hung.
The drive pulley 20 is not limited to metal, and may be made of resin.

Further, the drive pulley 20 is provided with a pair of flanges 21 and 21 raised substantially vertically at both ends in the axial direction.
When the toothed belt 40 being driven moves toward one end, the pair of flanges 21 and 21 come into contact with the end surface 40a of the toothed belt 40, so that the toothed belt 40 comes off from the drive pulley 20. It has a function to prevent things from happening.

Further, as shown in FIGS. 3 and 4, the drive pulley 20 has the tooth tip surface 22a and the tooth bottom surface 22b at the bottom at the center portion 20b of the width in the axial direction from both end portions 20a and 20a on the flange 21 side. As described above, they have the same curved surface shape in which the height gradually decreases from both end portions 20a and 20a toward the central portion 20b.
In the first embodiment, the drive pulley 20 has a tooth tip surface 22a and a tooth bottom surface 22b having an arcuate curved surface shape.
More specifically, the drive pulley 20 is the same so that the tooth tip surface 22a and the tooth bottom surface 22b have the maximum heights at both ends 20a and 20a on the flange side and the center of the axial width is the minimum height. It has an arc-shaped curved surface.

The driven pulley 30 is made of resin, and in order to bridge the toothed belt 40 in an annular shape with the drive pulley 20, a plurality of toothed belts 40 mesh with the teeth 42 on the circumferential surface on which the toothed belt 40 is hung. The teeth 32 are formed along the circumferential direction.
Further, the driven pulley 30 is provided with a pair of flanges 31 and 31 that are raised substantially vertically at both ends in the axial direction.
When the toothed belt 40 being driven moves toward one end, the pair of flanges 31 and 31 come into contact with the end surface 40a of the toothed belt 40, so that the toothed belt 40 comes off from the driven pulley 30. It has a function to prevent things from happening.

The toothed belt 40 is an elastic belt having a quadrangular cross section containing a synthetic rubber material or the like, and in this embodiment, both ends are connected by a belt connecting tool 50 to form an annular shape.
The toothed belt 40 has a belt main body 41 and a plurality of teeth 42 formed on the inner peripheral surface of the belt main body 41.
The toothed belt 40 of the first embodiment has a rectangular cross-sectional shape in which the width direction is longer than the thickness direction.

As shown in FIGS. 5 and 6, the toothed belt 40 has a convex portion 42 having teeth 42 formed on the inner peripheral surface of the belt body 41 and a concave portion 43 having no teeth 42 formed in the extending direction. It is formed alternately along the line.

As shown in FIG. 7, the belt connecting tool 50 has a distance between a pair of end fixing portions 51 and 52 fixed to each end of the toothed belt 40 and a pair of end fixing portions 51 and 52. It has an end spacing adjusting portion 53 that is adjustablely connected.
In this belt connecting tool 50, in a state where each end of the toothed belt 40 is fixed to the pair of end fixing portions 51 and 52, the distance between the pair of end fixing portions 51 and 52 is set by the end spacing adjusting portion 53. By adjusting, the tension of the toothed belt 40 spanning the drive pulley 20 and the driven pulley 30 in an annular shape can be adjusted.

In the first embodiment, the toothed belt 40 is illustrated in which both ends are connected by the belt connecting tool 50, but an endless annular belt without using the belt connecting tool 50 may be used.

In such a belt drive mechanism 1, the drive pulley 20 connected via the power transmission mechanism of the reduction mechanism 11 is rotationally driven by driving the drive motor 10, and the driven pulley 20 is rotationally driven by the rotational drive of the drive pulley 20. The toothed belt 40 spanning the ring with 30 is rotated.

Therefore, in the toothed belt 40, the drive motor 10 is rotated and controlled in both the forward rotation direction and the reverse rotation direction by a control unit (not shown) of the automatic door device 100, so that the toothed belt 40 can be rotated in both the forward rotation direction and the reverse rotation direction. It is designed to be rotated.

When the toothed belt 40 is annularly bridged between the drive pulley 20 and the driven pulley 30 while holding a predetermined tension, as shown in FIG. 5, the tooth tip surface 22a of the drive pulley 20 and the teeth It is contacted so as to follow the bottom surface 22b.
More specifically, in the toothed belt 40, the tooth tip surface 42a of the tooth 42, which is the convex portion 42, is followed by the tooth bottom surface 22b of the drive pulley 20, and the surface 43a of the recess 43 is the tooth tip surface 22a of the drive pulley 20. It is contacted so as to be followed by.
That is, the toothed belt 40 follows the tooth tip surface 42a of the tooth 42, which is the convex portion 42, with the curved tooth bottom surface 22b of the drive pulley 20 by bending the width direction of the quadrangular cross section by using elasticity. The surface 43a of the recess 43 is made to follow the curved tooth tip surface 22a of the drive pulley 20.

In this way, the toothed belt 40 can follow the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 so that the curved surface shapes of the tooth tip surface 22a and the tooth bottom surface 22b gradually change to be easy to follow. One of the factors is that it has become.

Further, as another factor, in the toothed belt 40, the convex portion 42 on which the tooth 42 is formed and the concave portion 43 on which the tooth 42 is not formed are alternately arranged along the circumferential direction of the inner peripheral surface of the belt body 41. It is mentioned that it is formed by.
In other words, the surface of the toothed belt 40, which is the portion that comes into contact with the drive pulley 20, is toothed by the convex portion 42, which is the portion forming the maximum thickness, and the concave portion 43, which is the portion forming the thin wall portion. Since the convex portions 42 are formed in an alternating arrangement along the extending direction of the belt 40 and are separated by the concave portion 43 as a boundary, the tooth tip surface 42a of the toothed belt 40 and the surface 43a of the concave portion 43 are formed. Has a shape that easily follows the curved surface shapes of the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20.

Further, as a further factor that the toothed belt 40 can follow the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20, the cross-sectional shape of the toothed belt 40 has a rectangular shape whose width direction is longer than the thickness direction. Therefore, it can be mentioned that the thickness direction to be bent in order to follow is thinner than the width direction.

In the toothed belt 40, the tooth tip surface 42a of the tooth 42, which is the convex portion 42, follows the curved tooth bottom surface 22b of the drive pulley 20, and the surface 43a of the concave portion 43 is the curved tooth tip surface 22a of the drive pulley 20. By following the above, both end surfaces 40a and 40a are less likely to come into contact with the flanges 21 and 21 of the drive pulley 20.
More specifically, both ends 20a so that the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 are at the bottom at the central portion 20b of the axial width from the flanges 21, 21 side both end portions 20a, 20a. Since the toothed belt 40 has the same curved shape in which the height gradually decreases from 20a to the central portion 20b, the toothed belt 40 is placed between the drive pulley 20 and the driven pulley 30 while holding a predetermined tension. When the tooth is rotated in a state of being bridged in an annular shape, a force is applied to return the tooth tip surface 22a and the tooth bottom surface 22b to the central portion 20b in the width direction which is the bottom.
Therefore, even if the toothed belt 40 moves toward one end 20a of the drive pulley 20, that is, toward one flange 21 during rotation, it is returned to the central portion 20b, which is the bottom, and thus rubs against the flange 21. There is no such thing.

Next, the engine base 120 will be described.
The engine base 120 is a portion in which the belt drive mechanism 1 is housed with the axial tip side of the drive motor 10 and the drive pulley 20 facing the opening 120a.
The engine base 120 is fixed to the main body frame 110 with an opening 120a on the front side in consideration of maintainability of the automatic door device 100.

Further, as shown in FIG. 2, the engine base 120 has a cover 121 attached to an opening 120a arranged corresponding to the dimension of the drive motor 10 in the axis 10a direction.
That is, the belt drive mechanism 1 housed in the engine base 120 with the tip side in the direction of the shaft 10a facing the opening 120a is a portion where the drive motor 10 protrudes most toward the opening 120a, so that the cover 121 is attached. The opening 120a of the engine base 120 is formed at a position where the cover 121 does not interfere with the drive motor 10.

In the automatic door device 100 incorporating such a belt drive mechanism 1, as shown in FIG. 1, the door 140 is connected to the toothed belt 40 by the connecting metal fitting 130, and the rotation direction of the toothed belt 40 is positive. The door 140 is slid in the opening / closing direction by being changed in the rolling direction and the reverse direction.

In the automatic door device 100, when the drive motor 10 is driven, the toothed belt 40 causes the tooth tip surface 42a of the tooth 42, which is the convex portion 42, to follow the curved tooth bottom surface 22b of the drive pulley 20, and the concave portion 43. The surface 43a is rotated while following the curved tooth tip surface 22a of the drive pulley 20.
Therefore, the toothed belt 40 is rotated while being moved from a position closer to the flange 21 side of one end portion 20a of the drive pulley 20 in the width direction of the drive pulley 20 to return to the central portion 20b forming the bottommost portion. As a result, both end faces 40a and 40a are rotated without contacting the flange 21 of the drive pulley 20.

In the belt drive mechanism 1 according to the first embodiment of the present invention, the toothed belt 40 having an elastic quadrangular cross section and the tooth tip surface 22a and the tooth bottom surface 22b are axially oriented from both ends 20a and 20a on the flange 21 side. It has the same curved shape in which the height gradually decreases from both end portions 20a and 20a toward the central portion 20b so that the central portion 20b of the width is at the bottom, and the power of the drive motor 10 is transferred between the driven pulley 30 and the driven pulley 30. Since the toothed belt 40 has a drive pulley 20 that meshes with and transmits the toothed belt 40 that is bridged in an annular shape, the toothed belt 40 is annularly formed between the drive pulley 20 and the driven pulley 30 while holding a predetermined tension. When rotated in a bridged state, the tooth tip surface 42a of the tooth 42, which is the convex portion 42, follows the curved tooth bottom surface 22b of the drive pulley 20, and the surface 43a of the concave portion 43 has the curved shape of the drive pulley 20. By following the tooth tip surface 22a, a force is applied to return to the tooth tip surface 22a of the drive pulley 20 and the central portion 20b in the width direction which is the bottom of the tooth bottom surface 22b.
Therefore, even if the toothed belt 40 moves toward one end 20a of the drive pulley 20, that is, toward one flange 21 during rotation, it is returned to the central portion 20b, which is the bottom, and thus rubs against the flange 21. Can be avoided.
Therefore, the belt drive mechanism 1 according to the first embodiment of the present invention can prevent the generation of abnormal noise due to the toothed belt 40 coming into contact with the flange 21 of the drive pulley 20 even in long-term use.

Further, in the belt drive mechanism 1 according to the first embodiment of the present invention, since the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 have an arcuate curved surface shape, the tooth tip surface 22a and the tooth bottom surface of the drive pulley 20 are formed. The curved surface shape of 22b can be easily processed to a desired size.

Further, in the belt drive mechanism 1 according to the first embodiment of the present invention, since the toothed belt 40 is formed in an annular shape by connecting both ends by the belt connecting tool 50, the belt connecting tool 50 has teeth. Although it is easily affected by the imbalance of the load applied to the belt 40, even if the toothed belt 40 moves closer to one end 20a of the drive pulley 20, that is, to one flange 21 side during rotation, it becomes the bottom. Since it is returned to the central portion 20b so that it does not rub against the flange 21, it is possible to prevent the generation of abnormal noise due to the toothed belt 40 coming into contact with the flange 21 of the drive pulley 20 even in long-term use. it can.

Further, since the automatic door device 100 according to the first embodiment of the present invention incorporates the belt drive mechanism 1, the same effect as that of the belt drive mechanism 1 according to the first embodiment of the present invention can be obtained.
(Modification example 1)

Next, a modification 1 of the belt drive mechanism and the automatic door device according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a view of the periphery of the belt drive mechanism 2 of the modified example viewed from the upper surface side, and is a partial cross-sectional view.

The belt drive mechanism 2 and the automatic door device 200 of the first modification use the tooth tip surface by utilizing the axial space in which the drive pulley 20 of the belt drive mechanism 2 is inside the tip surface of the drive motor 10 in the axis 10a direction. It differs from the belt drive mechanism 1 and the automatic door device 100 of the first embodiment in that the width in the axial direction required for forming the curved shape of the 22a and the tooth bottom surface 22b is set.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The belt drive mechanism 2 of the modification 1 expands the width in the axial direction until the drive pulley 20 positions the end face flush with the tip surface in the axial direction of the drive motor 10.
Therefore, the drive pulley 20 can secure a large width in the axial direction, and the degree of freedom regarding the design of the curved surface shape of the tooth tip surface 22a and the tooth bottom surface 22b can be increased accordingly.
In this modification, the driven pulley 30 is also expanded in the axial direction in response to the expansion of the width of the drive pulley 20.

In the belt drive mechanism 2 of this modification 1, the drive pulley 20 is a shaft in which the shaft 23 is arranged parallel to the shaft 10a of the drive motor 10 and is inside the tip surface 10b in the direction of the shaft 10a of the drive motor 10. Since the width in the shaft 23 direction required for forming the curved shape of the tooth tip surface 22a and the tooth bottom surface 22b is set by using the space in the 23 direction, the drive motor 10 is most projected toward the tip end side in the shaft 10a direction. In the case of a portion, the width in the shaft 23 direction of the drive pulley 20 required for forming the curved shape of the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 can be set by effectively utilizing the space in the direction of the shaft 10a. ..

Further, in the automatic door device 200 of the modified example 1, the belt drive mechanism 2 is housed in the tip side of the drive motor 10 and the drive pulley 20 in the shaft 23 direction toward the opening 120a to which the cover 121 is attached, and the opening 120a side. The engine base 120 has an opening 120a formed at a position where the cover 121 is attached without interfering with the dimension of the drive motor 10 in the axis 10a direction, which is the most protruding part of the belt drive mechanism 2.
Therefore, in the automatic door device 200 of this modified example, since the drive motor 10 of the belt drive mechanism 2 housed in the engine base 120 is the portion most projected toward the opening 120a, the cover 121 is attached. , An extra space is created between the drive pulley 20 and the cover 121 on the tip side in the axis 23 direction.
Therefore, the automatic door device 200 of the first modification 1 effectively utilizes the axial space in the axial 23 direction of the drive pulley 20 necessary for forming the curved surface shape of the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20. The width can be set.
(Modification 2)

Next, a modified example 2 of the belt drive mechanism 1 and the automatic door device 100 according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a perspective view showing the periphery of the drive pulley 20A of the belt drive mechanism 2A of the modified example 2.

The belt drive mechanism 2A and the automatic door device 200A of the second modification are the same as the belt drive mechanism 1 and the automatic door device 100 of the first embodiment in that the drive pulley 20A of the belt drive mechanism 2A does not have the flanges 21 and 21. different.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the belt drive mechanism 2A of the second modification, the drive pulley 20A does not have flanges 21 and 21 at both ends in the axial direction.
The drive pulley 20A is gradually heightened from both end portions 20a and 20a toward the center portion 20b so that the tooth tip surface 22a and the tooth bottom surface 22b are at the bottom at the center portion 20b having an axial width from both end portions 20a and 20a. It has the same curved surface shape with a lower height.
In the second modification, the drive pulley 20A has a tooth tip surface 22a and a tooth bottom surface 22b having an arcuate curved surface shape.
The drive pulley 20A has the same arcuate curved surface shape so that the tooth tip surface 22a and the tooth bottom surface 22b have the maximum heights at both ends 20a and 20a and the center of the axial width is the minimum height. , The same as in the first embodiment, the shape is not necessarily limited to an arc shape.

In the belt drive mechanism 2A of the second modification, the toothed belt 40 is elastically bent in the width direction of a quadrangular cross section by using elasticity, and the tooth tip surface 42a of the tooth 42, which is a convex portion 42, is driven. The curved tooth bottom surface 22b of the pulley 20A is followed, and the surface 43a of the recess 43 is followed by the curved tooth tip surface 22a of the drive pulley 20, so that the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 are followed. A force is applied to return to the central portion 20b in the width direction, which is the bottom.
Therefore, since the belt drive mechanism 2A and the automatic door device 200A of the modified example 2 do not have flanges 21 at both ends of the drive pulley 20A, the toothed belt 40 makes an abnormal noise due to contact with the flange of the drive pulley 20A. Since the occurrence can be prevented and the toothed belt 40 does not come off from the drive pulley 20A during rotation, the same effect as that of the belt drive mechanism 1 and the automatic door device 100 of the first embodiment can be obtained. ..

Next, the belt drive mechanism 3 and the automatic door device 300 according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a perspective view showing the periphery of the driven pulley 60 of the belt drive mechanism 3 of the second embodiment.

In the belt drive mechanism 3 and the automatic door device 300 according to the second embodiment of the present invention, the driven pulley 60 of the belt drive mechanism 3 has a curved tooth tip surface 62a and a tooth bottom surface 62b as in the drive pulley 20 of the first embodiment. It differs from the belt drive mechanism 1 and the automatic door device 100 of the first embodiment in that it is formed.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the driven pulley 60 of the belt drive mechanism 3 according to the second embodiment, as shown in FIG. 10, the tooth tip surface 62a and the tooth bottom surface 62b of the tooth 62 have an axial width from both end portions 30a and 30a on the flange 31 side. It has the same curved surface shape in which the height gradually decreases from both end portions 30a and 30a toward the central portion 30b so that the central portion 30b of the above is at the bottom.
In the second embodiment, the driven pulley 60 has a tooth tip surface 62a and a tooth bottom surface 62b having an arcuate curved surface shape.
More specifically, in the driven pulley 60, the tooth tip surface 62a and the tooth bottom surface 62b have the maximum heights at both ends 30a and 30a on the flange 31 side, and the center of the width in the shaft 33 direction has the minimum height. It has the same arcuate curved surface shape.
In the second embodiment, the driven pulley 60 is set so that the width in the shaft 33 direction and the curved surface shapes of the tooth tip surface 62a and the tooth bottom surface 62b are the same as those of the drive pulley 20.

In the belt drive mechanism 3 according to the second embodiment of the present invention, the tooth tip surface 62a and the tooth bottom surface 62b of the driven pulley 60 are central portions of the width in the axial direction from both end portions 30a and 30a on the flange 31 side of the driven pulley 60. The toothed belt 40 retains a predetermined tension because it has the same curved surface shape in which the height gradually decreases from both end portions 30a and 30a of the driven pulley 60 toward the central portion 30b so that 30b is at the bottom. When the tooth 42a, which is the convex portion 42, is rotated in a state of being annularly bridged between the drive pulley 20 and the driven pulley 60, the tooth tip surface 42a of the tooth 42, which is the convex portion 42, becomes the curved tooth bottom surface 62b of the driven pulley 60. The surface 43a of the recess 43 is followed by the curved tooth tip surface 62a of the driven pulley 60, so that the central portion in the width direction becomes the bottom of the tooth tip surface 62a and the tooth bottom surface 62b of the driven pulley 60. A force returning to 31b is applied.
Therefore, even if the toothed belt 40 moves toward one end of the driven pulley 60 during rotation, that is, toward one flange 31, the toothed belt 40 is returned to the central portion 31b, which is the bottom, and does not rub against the flange 31. Can be done.

Further, since the automatic door device 300 according to the second embodiment of the present invention incorporates the belt drive mechanism 3 according to the second embodiment of the present invention, it is the same as the belt drive mechanism 3 according to the second embodiment of the present invention. It can be effective.

In the belt drive mechanism 3 and the automatic door device 300 according to the second embodiment of the present invention, the driven pulley 60 has a flange 31 as an example, but the same as the drive pulley 20A shown in the second modification of the first embodiment. The configuration without the flange 31 may be used.

Next, the belt drive mechanism 4 and the automatic door device 400 according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a perspective view showing the periphery of the driven pulley 70 of the belt drive mechanism 4 of the third embodiment.

In the belt drive mechanism 4 and the automatic door device 400 according to the third embodiment of the present invention, the driven pulley 70 of the belt drive mechanism 4 functions as an idler, the pair of flanges at both ends are eliminated, and the toothed belt 40. The groove inner peripheral surface 71a of the groove 71 to be hung is different from the belt drive mechanism 1 and the automatic door device 100 of the first embodiment in that the toothed belt 40 has a curved shape so as not to come off from both ends of the driven pulley 70. ..
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The driven pulley 70 of the belt drive mechanism 4 according to the third embodiment is made of resin, and as shown in FIG. 11, the toothed belt 40 is used to bridge the toothed belt 40 with the drive pulley 20 in an annular shape. The inner peripheral surface 71a of the groove 71 to be hung is directed from both end portions 70a, 70a to the central portion 70b so that the central portion 70b having a width in the axial 33 direction from both end portions 70a, 70a in the shaft 33 direction is at the bottom. It has a curved surface shape that is formed so that the height gradually decreases.

The groove inner peripheral surface 71a has a curved surface shape so that the toothed belt 40 rotated between the drive pulley 20 and the drive pulley 20 rotationally driven by the drive motor 10 does not come off from both ends.

In the third embodiment, the driven pulley 70 has an arcuate curved surface on the inner peripheral surface 71a of the groove. That is, the driven pulley 70 is formed with an arcuate groove inner peripheral surface 71a based on a circle having a diameter of a predetermined dimension.
Such a driven pulley 70 can be easily manufactured by carving a groove inner peripheral surface 71a into a resin columnar member, in addition to mold molding.

In the belt drive mechanism 4 according to the third embodiment of the present invention, the driven pulley 70 has the groove inner peripheral surface 71a of the groove 71 on which the toothed belt 40 is hung from both ends 70a and 70a of the driven pulley 70 in the axial 33 direction. It is a curved surface shape formed so that the height gradually decreases from both end portions 70a and 70a toward the central portion 70b so that the central portion 70b of the axial width is at the bottom, and the groove inner peripheral surface 71a is formed. The toothed belt 40 that is rotated between the driven pulley 20 and the driven pulley 20 has a curved shape so as not to come off from both ends of the driven pulley 70.
Therefore, the belt drive mechanism 4 according to the third embodiment of the present invention does not have a pair of flanges at both ends of the driven pulley 70 as in the conventional driven pulley, and therefore has teeth between the drive pulley 20 and the driven pulley 70. When the belt 40 is bridged in an annular shape, the toothed belt 40 can be easily moved from one end side in the width direction of the driven pulley 70 toward the groove inner peripheral surface 71a.
Further, in the belt drive mechanism 4 according to the third embodiment of the present invention, the width direction of the quadrangular cross section having elasticity is flexed by using elasticity, and the tooth tip surface 42a of the tooth of the toothed belt 40 is formed on the inner peripheral surface of the groove. By following the curved shape of 71a, both end faces 40a and 40a of the toothed belt 40 are less likely to come into contact with the groove inner peripheral surface 71a, and the toothed belt 40 is closer to one end of the driven pulley 70 during rotation. Even if it moves to, it can be prevented from coming off from the driven pulley 70 by returning it to the central portion 70b which is the bottom.

Further, since the automatic door device 400 according to the third embodiment of the present invention incorporates the belt drive mechanism 4 according to the third embodiment of the present invention, it is the same as the belt drive mechanism 4 according to the third embodiment of the present invention. It can be effective.

Examples of the belt drive mechanisms 1, 2, 3, and 4 according to the first to third embodiments of the present invention and the modified examples include those in which the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 are curved surfaces having an arc shape. However, the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 are formed from both end portions 20a and 20a to the center portion so that the central portion 20b having an axial width from both end portions 20a and 20a on the flange 21 side is at the bottom. Other shapes may be used as long as they have the same curved surface shape in which the height gradually decreases toward 20b. For example, the tooth tip surface 22a and the tooth bottom surface 22b of the drive pulley 20 may have a shape using a part of an ellipse.

The invention made by the present inventor has been specifically described above based on the above-mentioned examples of the invention, but the present invention is not limited to the above-mentioned examples of the invention and does not deviate from the gist thereof. Can be changed in various ways.

1, 2, 2A, 3, 4 Belt drive mechanism 10 Drive motor 10a Axis 10b Tip surface 11 Deceleration mechanism 20, 20A Drive pulley 20a End 20b Central part 21 Flange 22 Tooth 22a Tooth tip surface 22b Tooth bottom 23 Axis 30, 60 , 70 Driven pulley 31 Flange 30a, 70a End 30b, 70b Central 32, 62 Tooth 62a Tooth tip surface 62b Tooth bottom 71 Groove 71a Groove inner peripheral surface 33 Shaft 40 Toothed belt 40a End surface 41 Belt body 42 teeth (convex part) )
42a Tooth tip surface 43 Recessed 43a Surface 50 Belt connecting tool 51, 52 End fixing part 53 End spacing adjusting part 110 Body frame 120 Engine base 120a Opening 121 Cover 130 Connecting bracket 140 Door 100, 200, 200A, 300, 400 Automatic Door device

In order to solve the above-mentioned problems and achieve the object, the belt drive mechanism according to the present invention has an elastic toothed belt having a quadrangular cross section, and the tooth tip surface and the tooth bottom surface are shafts from both ends on the flange side. It has the same curved shape in which the height gradually decreases from both ends toward the center so that the center of the width in the direction is at the bottom, and the power of the drive motor is annularly connected to the driven pulley. possess a drive pulley for transmitting mesh with the toothed belt spanned, and the driven pulley, the groove in the peripheral surface of the groove to apply the toothed belt, axially from both axial ends of the driven pulley It is a curved surface shape formed so that the height gradually decreases from both end portions toward the center portion so that the center portion of the width of the groove is at the bottom, and the groove inner peripheral surface is rotationally driven. the toothed belt is rotated between the driving pulley is characterized that you have a curved surface shape so as not to deviate from the both end portions of the driven pulley.

Automatic door system according to the present onset Ming, since the belt driving mechanism is incorporated, it is possible to obtain the same effect as the belt drive mechanism.

Claims (8)

An elastic toothed belt with a square cross section,
The tooth tip surface and the tooth bottom have the same curved surface shape in which the height gradually decreases from both ends toward the center so that the center of the width in the axial direction from both ends is the bottom, and the drive motor The power of the drive pulley is transmitted by engaging with the toothed belt that is annularly bridged with the driven pulley.
A belt drive mechanism characterized by having. The tooth tip surface and the tooth bottom surface
The belt drive mechanism according to claim 1, wherein the belt drive mechanism has an arcuate curved surface shape. The drive pulley
The curved shape of the tooth tip surface and the tooth bottom surface is formed by utilizing the axial space in which the shaft is arranged parallel to the axis of the drive motor and is inside the tip surface in the axial direction of the drive motor. The belt drive mechanism according to claim 1 or 2, wherein the width in the axial direction required for the above is set. The driven pulley is
The tooth tip surface and the tooth bottom surface of the driven pulley are gradually heightened from both ends of the driven pulley toward the center so that the center of the width in the axial direction from both ends of the driven pulley is the bottom. The belt drive mechanism according to claim 1, 2 or 3, wherein the belt drive mechanism has the same curved surface shape. The driven pulley is
The inner peripheral surface of the groove on which the toothed belt is hung gradually rises from both ends toward the center so that the center of the width in the axial direction from both ends in the axial direction of the driven pulley is at the bottom. It is a curved surface shape formed so that the height is low.
The inner peripheral surface of the groove is
The first, second or third aspect of the present invention, wherein the toothed belt rotated with the rotationally driven drive pulley has a curved shape so as not to come off from both ends of the driven pulley. The belt drive mechanism described. The toothed belt
The belt driving mechanism according to claim 1, 2, 3, 4 or 5, wherein both ends are connected by a belt connecting tool to form an annular shape. The belt drive mechanism according to claim 1-6 is incorporated.
An automatic door device characterized in that a door is opened and closed by being connected to the toothed belt of the belt drive mechanism. The drive motor is a portion of the belt drive mechanism in which the belt drive mechanism is housed and most protrudes toward the opening side so that the axial tip side of the drive motor and the drive pulley faces an opening to which a cover is attached. The automatic door device according to claim 7, wherein the automatic door device has an engine base in which the opening is formed at a position where the cover is mounted without interfering with the axial dimension of the above.

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