JPH11230275A - Motor-built-in pipe drive structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and the weight of a motor-built- in pipe drive structure, facilitate its centering in assembly, increase the degree of freedom in designing the slenderness of its pipe shaft, and facilitate its attachment or detachment to or from an external member, by simplifying its structure. SOLUTION: The swinging motion of an external gear 116 is absorbed through a swing shaft 190 and transmitted to a fixed bushing 120. The fixed bushing 120 is fixed to an external member 140 through a mounting shaft 150 held axially slidable. The output of a reduction gear R is thus taken out from an internal gear 118 side and transmitted to a pipe 110 through inner supports 170 and 172.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe driving structure having a built-in motor.

[0002]

2. Description of the Related Art Conventionally, various pipe driving structures have been proposed in which a motor and a speed reducer are provided in a pipe, and the rotation of the motor is reduced by the speed reducer and transmitted to the pipe.

[0003] This type of pipe driving structure with a built-in motor is used, for example, as a motor roller MR arranged on a conveyor 2 and for directly moving a conveyed article 4 as shown in FIG. Alternatively, as shown in FIG. 11, it may be used as a motor pulley MP for moving the conveyed object 4 via the belt 6.

FIG. 12 shows an example of a conventionally known motor roller MR (or motor pulley MP).

[0005] Inside the pipe 10 is a motor Mo and a reduction gear Ro.
Is stored, and the rotation of the motor Mo is reduced by the speed reducer Ro and transmitted to the pipe (drum) 10.

The motor Mo has a motor shaft 12, which also serves as the input shaft 13 of the speed reducer Ro.

The speed reducer Ro is connected to the input shaft (first shaft) 13.
And an external gear 16 incorporated into the outer periphery of the input shaft 13 via an eccentric body 14 and capable of eccentrically oscillating rotation with respect to the input shaft 13, and an internal tooth internally meshing with the external gear 16 Gear 1
8 and an output shaft (second shaft) 20 connected to the external gear 16 so as to absorb the eccentric oscillating component of the external gear 16. is there.

When the input shaft (first shaft) 13 makes one rotation, the external gear 16 eccentrically swings about the motor shaft 12 once via the eccentric body 14. Due to this eccentric swing, the internal gear 1
(Inscribed) meshing position between the external gear 8 and the external gear 16
Rotate. However, the number of teeth of the external gear 16 is 1
Since the number of teeth is smaller by N (usually 1) than the number of teeth of 8, the external gear 16 is out of phase (rotates) with respect to the internal gear 18 by the “difference in the number of teeth N”.

Therefore, if only the rotation component of the external gear 16 is extracted, a large reduction ratio of (number of teeth N) / (number of teeth of the external gear) can be obtained. In this conventional example, specifically, the swing component of the external gear 16 includes an inner pin 22 protruding from the output shaft (second shaft) 20 side, and an internal pin hole 24 penetratingly formed on the external gear 16 side. Is absorbed by loose fit. Then, only the rotation component is output to the output shaft (second
(Shaft) 20 is adopted.

The rotational torque transmitted to the output shaft 20 is transmitted to the pipe (drum) 10 via the bracket 26.

In order to actually rotate the pipe 10 by the transmitted torque, the reaction torque must be received somewhere. In the motor roller MR, this reaction torque is generated as a torque for rotating the internal gear 18 or a torque for rotating the motor shaft 12 in the reverse direction. The reaction torque generated on the internal gear 18 side is the case 30, the mounting plate 32, the fixed pipe (drum) 3
4. The power is transmitted to the fixed shaft 38 via the bolt 36.
The reaction torque generated on the motor shaft 12 is transmitted to the fixed shaft 38 via the motor case 40.
The reaction torque is received by attaching the fixed shaft 38 to an external member such as a conveyor.

The output shaft 20 of the speed reducer Ro is connected to the bearing 4
2. It is rotatably attached to an external member 40 such as a conveyor via a cover 44 and the like.

[0013]

However, the motor roller MR (or motor pulley MP) according to the above-mentioned conventional pipe driving structure has the following various problems.

The first problem is that the size and weight of the roller as a whole tend to increase in order to secure the rigidity and durability of each member.

That is, in the conventional pipe driving structure,
The torque generated on the motor shaft 12 side as a reaction of the torque for rotating the pipe 10 is transmitted to the fixed shaft 38, and the torque generated on the internal gear 18 side is transmitted to the case 3.
0, the mounting plate 32, the fixed pipe 34, and the bolt 36 are used to transmit the same to the fixed shaft 38. Therefore, the fixed pipe 34 is arranged “double” inside the pipe 10, so that the size (especially the size in the radial direction) cannot be avoided, and the number of parts has also increased.

Moreover, the individual members are each connected to the pipe 10
Since it is necessary to transmit a torque equivalent to the output torque for rotating the member, a corresponding thickness and height are required to ensure the rigidity and durability of each member. For this reason, the conventional structure has a problem that the whole becomes large and heavy as a result.

The second problem is that it is very difficult to maintain high assembly accuracy of the members constituting the speed reducer Ro and the motor Mo.

This type of pipe driving structure has an internal gear 18 and an output gear with respect to the axis of the motor shaft 12 because the structure of the reduction gear employed is an oscillating internal meshing type planetary gear structure. It is particularly required to assemble the shaft 20 so that the axes of the shafts 20 are accurately matched. However, in the conventional structure, the speed reducer Ro is mounted in a so-called floating state in a "space" substantially at the center of the pipe 10. For this reason, it is very difficult to assemble the components with their axes aligned. If the axial centers of the members do not coincide with each other with high accuracy, an excessive force is likely to act on each member, and it is easy to cause generation of vibration and decrease in durability.

A third problem is that it is difficult to secure the axial length of the pipe (roller).

That is, in this type of motor roller, there is a demand for products of various sizes (length in the axial direction) according to the size of the conveyed object. However, the conventional structure is configured such that the reaction of the output torque is transmitted through the inside of the pipe. Therefore, if the axial length of the pipe is long, the members constituting the reduction gear Ro and the motor Mo have strong torsional stress. Was easy to occur. In addition, since the output torque is applied to the pipe 10 from the “end” of the pipe 10, if the transport load of the transported object 4 is applied from the “central part” or the “other end” of the pipe 10. Also, a large torsional stress was easily generated in the pipe 10 itself. Under these circumstances, the conventional structure has a problem in that the axial length of the pipe 10 cannot be made too long, and it cannot always respond satisfactorily to the demands of consumers.

A fourth problem is that it is difficult to mount and remove the motor roller when replacing it.

That is, since this type of motor roller or motor pulley constitutes one part of a larger external member such as a conveyor, it is often replaced with a change in the transport specification required for the conveyor. You.
It is also often removed for maintenance such as damage repair. Therefore, it is strongly required that the replacement be easy. However, the conventional drive structure has a problem that the replacement takes a lot of trouble and time because the structure for fixing to the external member is complicated.

Further, only a motor roller having a specific axial length can be mounted at a specific position. If the motor roller has a slightly different axial length, the motor roller may be mounted unless the mounting portion on the external member side is improved. There was also a problem that it was not possible.

The present invention has been made in view of such various problems in the prior art, and the number of parts is reduced, the weight is reduced, and the centering at the time of assembly is reduced by rational simplification of the structure. Securing ease, increasing the degree of freedom in designing the pipe axial length,
It is an object of the present invention to simultaneously realize all of simplification of attachment / detachment to / from an external member.

[0025]

According to a first aspect of the present invention, there is provided a structure in which a motor and a speed reducer are provided in a pipe, and the rotation of the motor is reduced by the speed reducer and transmitted to the pipe. A first shaft that receives rotation of the motor, an external gear that is incorporated around an outer periphery of the first shaft so as to be eccentrically rotatable and rotatable, A oscillating internally meshing planetary gear reducer having an internal gear that meshes with the external gear and a second shaft connected to the external gear so as to absorb the eccentric oscillating component of the external gear; In a pipe drive structure of a motor built-in type, bearings disposed at both ends of the pipe, and a pair of mounting shafts which are held rotatably relative to the pipe via the bearings and which are non-rotatably mounted to external members. And the motor is driven by one of the pair of mounting shafts. Holding the motor shaft toward the center of the pipe, connecting the first shaft of the speed reducer to the motor shaft directed toward the center, and connecting the second shaft of the speed reducer to the pair of mounting shafts. The above-mentioned problem has been solved by connecting the internal gear of the speed reducer to the pipe so that the internal gear cannot rotate relative to the other pipe.

According to a second aspect of the present invention, in the first aspect, at least one of the pair of mounting shafts is slidable along an axial direction of the pipe by a spring and is free to return. A motor pulley and the like according to the drive structure can be attached to and detached from an external member with a single touch, and exchangeability (interchangeability) of attachment can be maintained even if the axial length of the motor roller is slightly different.

According to a third aspect of the present invention, in the first aspect, a pair of inner supports which rotate integrally with the pipe are provided at both axial positions of the speed reducer, and the internal gear of the speed reducer is further provided. Is connected to the pipe via the inner support so as not to rotate relatively, thereby further improving the accuracy of assembling the speed reducer and increasing the rigidity at the center of the pipe.

According to a fourth aspect of the present invention, in the third aspect, the first shaft of the motor and the speed reducer is supported by a bearing incorporated in the inner support. With this configuration, the motor can be incorporated more stably, and even if, for example, the motor shaft or the first shaft of the speed reducer is elongated, the elongated portion can be stably supported.

According to a fifth aspect of the present invention, in the first aspect, the motor and the first shaft of the speed reducer are connected in such a manner as to be able to absorb a slight displacement of the axis of the two. Things.

Accordingly, even if the axis of the motor shaft is
Even if the axis of the shaft is slightly deviated, this can be favorably absorbed. If the deviation of the axis can be absorbed, vibration and noise can be reduced accordingly, and the radial force applied to one shaft can be prevented from being transmitted to the other.

According to a sixth or seventh aspect of the present invention, in the first aspect, the second shaft is connected to the external gear of the speed reducer so as to absorb an eccentric oscillating component of the external gear. A swing shaft is interposed between the external gear side and the second shaft side, and one end of the swing shaft and the external gear, and the other end of the swing shaft and the second shaft are respectively formed. Large spline or a structure that is connected by a universal joint.

This eliminates the necessity of forming an inner pin hole in the external gear, which has been required in the past, so that the radius of the external gear can be reduced accordingly, and the size of the reduction gear in the radial direction can be reduced. it can. As a result, a pipe driving structure having a large output and a small diameter can be easily obtained. Further, by changing the length of the oscillating shaft, it becomes possible to flexibly cope with a change in the axial length of the pipe. Further, due to the presence of play in the spline connection at both ends of the oscillating shaft or the function of the universal joint, it is possible to absorb a deviation in the assembly of the axis between the external gear and the second shaft. The effect of absorbing the deviation of the axis is as described above.

The connection between one end of the oscillating shaft and the external gear and the other end and the second shaft may both be "large spline connection", or both may be "universal joints". "Combination". Further, separate joining methods may be employed for one and the other.

[0034]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a motor roller MR to which a pipe driving structure according to the present invention is applied. 2 is an enlarged sectional view of a main part of FIG. 1, and FIGS.
FIG. 5 is a sectional view taken along arrows III-III, IV-IV, and VV in FIG.

First, the structural features of the motor roller MR will be schematically described. The pipe 110 houses a motor M and a speed reducer R. The rotation of the motor M is the reduction gear R
, And the deceleration output is transmitted to the pipe 110. This basic structure is the same as the conventional one.

The speed reducer R belongs to a so-called oscillating internal meshing type planetary gear speed reducer. The input shaft (first shaft) 113 receiving rotation of the motor M and the input shaft via an eccentric body 114. An external gear 116 is mounted on the outer periphery of the external gear 113 so as to be eccentrically rotatable with respect to the input shaft 113, an internal gear 118 internally meshed with the external gear 116, and an external gear 11
6 and a fixed bush (second shaft) 120 connected so as to absorb the eccentric oscillating component of the external gear 116.

The basic structure of the speed reducer R is substantially the same as the conventional one, but in this embodiment, the configuration for absorbing the eccentric oscillating component of the external gear 116 is different from the conventional one.

Conventionally, the internal gear 18 is fixed, the reduced rotation is taken out from the output shaft (second shaft) 20, and this is transmitted to the pipe 10. However, in this embodiment,
Fixed bush (close to mounting shaft 150 described later) (second
The shaft 120 is fixed, and reduced rotation is taken out from the internal gear 118 side just inside the pipe 110. Thus, a rotational torque can be applied to the pipe 110 at a substantially central position in the axial direction of the pipe 110 (without generating torsional stress). Also, the reaction torque can be easily transmitted to the mounting shaft side (without employing a double structure).

Both ends 110a, 110b of the pipe 110
Has bearings 160 via brackets 148 and 149,
162 are arranged. Also, the bearings 160, 162
Through the pair of mounting shafts 150 and 152 (the mounting shaft 150
Are further rotatably held with the pipe 110 (through a fixed bush 120). The pair of mounting shafts 150 and 152 are non-rotatably mounted on the external member 140 such as a column of the conveyor (with the pipe 110).

The motor M includes a pair of mounting shafts 150, 1
52, one (right side in the illustrated example) of the mounting shaft 152
Thus, the motor shaft 112 is held with the motor shaft 112 facing the center of the pipe. Since the mounting shaft 152 is non-rotatably mounted on the external member 140, the motor M is fixedly mounted on the external member 140 via the mounting shaft 152.

On the other hand, the fixed bush 120 corresponding to the second shaft of the reduction gear R is mounted on the other (left side in the illustrated example) of the mounting shaft 1.
It is connected to 50 so that it cannot rotate relatively. As a result, the fixed bush (second shaft) 120 is also non-rotatably mounted on the external member 140 via the mounting shaft 150.

As described above, in the speed reducer R according to this embodiment, the deceleration rotation of the input shaft (first shaft) 113 is not taken out from the fixed bush (second shaft) side but taken out from the internal gear 118 side. Is done. Therefore, the internal gear 118 is not fixed to the external member 140, but is connected to the pipe 110 so as not to rotate relatively.

In this embodiment, as described later, the internal gear 118 includes a pair of inner supports 170, 1
Via pipe 72 (indirectly rather than directly)
0 and are connected so that they cannot rotate relative to each other.

Hereinafter, a more specific configuration of each member of the motor roller MR will be described in detail.

The type of the motor M is not limited as long as it can be accommodated inside the pipe 110. In this embodiment, by utilizing the small and lightweight characteristics, the lead 15
4 is employed.

The speed of the commutator motor can be controlled at low cost by combining it with a controller (not shown) for adjusting the voltage.

If a more precise motor control is required, for example, by combining a DC brushless motor with a dedicated controller, the shift control can be accurately performed in a constant pattern even if there is a load fluctuation. Can be
It is also possible to support automatic machines and unmanned systems.

In addition, an induction motor can be used as an AC power supply, and a three-phase or single-phase motor can be selected according to the power supply. In this case, simple speed control can be performed by combining so-called inverter control.

As described above, as long as the motor can be accommodated in the pipe 110, the type of the motor is not limited, regardless of the type and the structure of the motor. Therefore, it may be appropriately selected according to the use and purpose of the motor roller MR.

The motor roller MR has a pair of inner supports 170 and 172 which rotate integrally with the pipe 110 at both axial positions of the speed reducer R. Each of the inner supports 170 and 172 is
At 4 and 176, it is integrated with the pipe 110 by being caulked to the pipe 110.

Each of the inner supports 170 and 172 is fixed at one end thereof to a fixed portion 170a or 172a of the frame 118a of the internal gear 118 which is closely fitted to the outer pin hole 118b.
Eighteen frames 118a are supported by both ends. As a result,
The internal gear 118 includes the pair of inner supports 170, 1
It is connected to the pipe 110 via 72 so as not to rotate relatively.

Each of the inner supports 170 and 172 is formed of a material having high rigidity so that deformation due to caulking does not affect the internal gear 118. Since the frame 118a of the internal gear 118 is tightly fitted and held at both ends by the highly rigid inner supports 170 and 172, the axis of the input shaft side inner support 170 and the internal gear 1 are fixed.
The axes of 18 completely coincide.

The outer periphery of the frame 118 a of the internal gear 118 is assembled with a slight gap from the inner periphery of the pipe 110. Thus, even if the pipe 110 itself is slightly dented or distorted due to caulking, a gap between the pipe 110 and the frame 118a of the internal gear 118 can always be ensured. Thus, the centering as designed for the internal gear 118 can be maintained regardless of the manufacturing accuracy or deformation of the pipe 110.

The inner support 170 on the input shaft side contributes to the holding and centering of the internal gear 118 in this way, holds the input shaft (first shaft) 113 via the bearing 180, and furthermore, the bearing 182. Through one end of the motor M. As a result, the input shaft 113 is held in a well-centered state by the highly rigid input shaft 113 side inner support 170, and the motor shaft side of the motor M is also held by the highly rigid input shaft side inner support 170. Therefore, the centering of the motor shaft 112 and the input shaft 113 is also performed favorably.

Since the motor M is connected and held to the mounting shaft 152 as described above, the external member 14
The pipe 110 is fixed so as not to rotate, and the pipe 110 is supported by both ends so as to be rotatable relative to each other.

As described above, the motor shaft 112 of the motor M is directed toward the center of the pipe 110, and the outer periphery of the tip is cut (so-called D cut).
The input shaft (first shaft) 113 of the speed reducer R is covered with a slight gap over the D-cut portion 112a. That is, the input shaft (first shaft) 1 of the motor M and the speed reducer R
Reference numeral 13 is connected in such a manner as to be able to absorb the difference between the axes of the two. As a result, even if the axes of the two shafts are slightly displaced, vibration and noise are prevented, and the radial load input from one side is not transmitted to the other side as it is. it can.

The structure for absorbing the swing component of the external gear 116 in the speed reducer R is not based on the loose fit of the inner pin 22 and the inner pin hole 24 as in the prior art, but this motor roller MR.
Utilizing the fact that the pipe 110 is long in the axial direction, a method of interposing an oscillating shaft 190 between the external gear 116 and the fixed bush (second shaft) 120 is adopted.
The connection between one end 190a of the oscillating shaft 190 and the external gear 116 and the connection between the other end 190b of the oscillating shaft 190 and the fixed bush 120 are realized by large splines 192 and 194, respectively.

As a result, the external gear 116 can be designed to have a very small dimension in the radial direction (because the inner pin hole 24 is not required to be formed), and accordingly the dimension (particularly in the radial direction) of the reduction gear R is small. is made of.

As shown in FIG. 3, FIG. 6, or FIG. 7, the number of teeth of the external gear 116 can be selected from several types for the same internal gear 118 (reference numerals 116-2 and 116-).
3). Thus, by replacing only the external gear 116 with 116-2 or 116-3 while sharing the expensive internal gear 118, several types of reduction ratios can be easily obtained.

Incidentally, both ends 19 of the swing shaft 190
The connection between the external gear 116 and the fixed bush (second shaft) 120 at 0a and 190b can be changed to a connection using a universal joint instead of a connection using a spline.

Although the connection by the universal joint is slightly higher in cost, it has a high swing absorbing performance. Therefore, especially when the connection with the external gear 116 is adopted, lower noise and lower vibration can be realized. In any case, the displacement of the axis on the fixed bush 120 side with respect to the swing locus of the external gear 116 can be absorbed without hindrance by the swing absorption via the swing shaft 190.

As described above, in the present embodiment, by fixing the fixed bush 120, the inner supports 170 and 17 can be moved from the internal gear 118 immediately inside the pipe 110.
The fixed bush 120 must always be a stationary system like the external member 140 because the structure is such that the rotational torque is transmitted to the pipe 110 via the second member 140. Fixed bush 120
The stationary bush 120 is non-rotatably connected to an external member 140 such as a conveyor, and to a mounting shaft 150 that is non-rotatably mounted so that the stationary bush 120 is always stationary.

The spring 15 is provided inside the fixed bush 120.
6, and a hexagonal slot (hexagonal hole) 130 is formed along the axial direction as shown in FIG. One end of the spring 156 receives the mounting shaft 150, and the other end is fixed to an end of the fixed bush 120. Thus, the mounting shaft 150 can slide in the axial direction due to the expansion and contraction of the spring 156. The mounting shaft 150 is loosely fitted in the hexagonal hole 130, so that the fixed bush 120 and the mounting shaft 150 cannot be rotated relative to each other.

Here, the spring 156 is used to make the mounting shaft 150 slidable. However, the present invention is not limited to the spring 156, but may be any as long as the mounting shaft can slide in the axial direction. .

Although the hexagonal hole is used to make the mounting shaft 150 and the fixed bush 120 relatively unrotatable, the structure is not limited to the hexagonal hole as described above, but a structure in which the relative rotation is not possible. Anything should do.

Next, the operation of this embodiment will be described.

When the motor shaft 112 of the motor M makes one rotation, the input shaft (first shaft) 113 of the speed reducer R makes one rotation.
When the input shaft 113 makes one rotation, the external gear 116 eccentrically swings about the input shaft 113 once via the eccentric body 114. This eccentric swing causes the internal gear 118 and the external gear 1
16 (inscribed) mesh position is sequentially shifted and makes one rotation. Here, the number of teeth of the external gear 116 is smaller than the number of teeth of the internal gear 118 by N (N = 3 in FIG. 3, N = 2 in FIG. 6, N = 1 in FIG. 7). The phase of the gear 116 is shifted from that of the internal gear 118 by the number N of teeth. However, in the case of this embodiment, the external gear 1
16 is a swing shaft 190, a fixed bush (second shaft) 1
20 to the mounting shaft 150. Therefore, since the external gear 116 is in a state where only its swing is allowed and rotation is restricted, this phase difference is caused by the internal gear 1
18 (deceleration) rotations.

The deceleration rotation of the internal gear 118 is controlled by the internal gear 1
A pair of inner supports 170, 17 arranged on both sides of
2, and further transmitted to the pipe 110.

The reaction torque when the pipe 110 is driven to rotate is controlled by the swing shaft 19 via the external gear 116.
It occurs on the 0 side and the input shaft 113 side. Swing shaft 190
The reaction generated on the side is caused by the fixed bush 120, the mounting shaft 1
It is received by the external member 140 via 50. The reaction torque generated on the input shaft 113 side is transmitted to the mounting shaft 152 via the motor M, and received by the external member 140.

As a result, the distance over which the reaction on the high torque side is transmitted can be reduced to about half of the conventional distance, and the torsion is extremely strong in combination with the shape of the member.

Further, since the power transmission from the internal gear 118 to the pipe 110 is performed not at the “end” of the pipe 110 but at a substantially central position, the pipe 110 can be transferred to any position in the axial direction. Is less likely to twist than before.

Further, since the speed reducer R and the motor M are firmly held by the highly rigid inner supports 170 and 172, the centering when assembling the respective members can be maintained with much higher precision than in the past. Can be. In addition, even if the axis of the motor shaft 112 and the axis of the input shaft 113 are misaligned, this can be absorbed by loose fitting of the D-cut coupling portion, and the center of the swing locus of the external gear 116 can be absorbed. Even if the axis of the fixed bush (second shaft) is misaligned,
It can be absorbed by both ends 190a and 190b of the swing shaft 190. Therefore, no vibration or noise is generated due to the displacement of the axial center, and even if a radial force is applied to a part of the pipe 110, it can be prevented from being transmitted to other parts.

Further, since the mounting shaft 150 has a slide structure using the spring 156, the mounting and dismounting to and from the external member 140 can be performed by one-touch operation. Easy to do. Also, with this slide structure, even if the motor rollers have slightly different axial lengths, they can be mounted at the same position on the same external member 140 without any trouble.

FIG. 9 shows another embodiment of the present invention.

In the embodiment according to FIG. 1, the external gear 116 and the fixed bush 1 at both ends of the drive shaft 190 are provided.
20 by a spline, the swing shaft 190
Although the diameter of the spline portion is the same as the diameter of the swing shaft, in this embodiment, the spline portion 402 is formed larger than the diameter of the swing shaft 400. In this way, power transmission (while swinging) from the external gear 404 to the swing shaft 400 is performed more reliably, and the durability of the spline portion 402 can be improved.

In addition, in this embodiment, the balance weight 406 is attached, and the vibration accompanying the swing of the external gear 404 is absorbed by the swing of the balance weight 406 in the opposite direction.

Reference numeral 408 in the figure denotes the swing shaft 4
This is a ball for preventing contact between the end of the input shaft 04 and the input shaft 410.

The other structure is almost the same as that of the previous embodiment, and therefore, the same or similar parts in the drawings are denoted by the same reference numerals as those in FIG. 1, and redundant description will be omitted.

In the above embodiment, the connection between the internal gear and the pipe is made through a pair of inner supports. However, in the present invention, the connection may be made directly. That is, the rigidity of the frame of the internal gear may be slightly further increased, and the frame and the pipe may be directly caulked.

This configuration has the performance of maintaining high rigidity,
Although the centering performance of each member is slightly lower than that of the previous embodiment, the number of parts can be greatly reduced, and the manufacturing can be facilitated and the cost can be reduced.

In this embodiment, a structure in which a rocking shaft is interposed is used as a structure for absorbing the rocking component of the external gear. However, if the pipe has a large radius, a conventional structure is used. The structure of the inner pin and the inner pin hole may be adopted as it is.

Further, in this embodiment, one of the mounting shafts has a slide structure in consideration of the ease of mounting. However, depending on the structure of the mounting position of the external member such as the conveyor, both mounting shafts are merely simple. It may be a fixing structure mounting shaft. Conversely, both mounting shafts may be mounting shafts of a slide structure.

[0084]

As described above, according to the present invention,
By drastically reviewing the conventional pipe drive structure, the number of parts is reduced, the weight is reduced, the centering is easy to assemble, the degree of freedom in designing the pipe length in the axial direction is increased, and attachment to external members・ Easy removal can be realized at the same time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a motor roller to which a pipe driving structure according to the present invention is applied.

FIG. 2 is a partially enlarged sectional view of the vicinity of a speed reducer in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along the line VV of FIG. 2;

FIG. 6 is a sectional view corresponding to FIG. 3, showing a modification of the external gear;

FIG. 7 is a sectional view corresponding to FIG. 3, showing a modification of the external gear;

FIG. 8 is a longitudinal sectional view showing a configuration of a fixed bush.

FIG. 9 is a partially enlarged sectional view of a motor roller to which another embodiment of the present invention is applied, corresponding to FIG. 2;

FIG. 10 is a schematic front view showing an example in which a pipe driving structure is applied to a motor roller.

FIG. 11 is a schematic front view showing an example in which a pipe driving structure is applied to a motor pulley.

FIG. 12 is a longitudinal sectional view showing a configuration of a conventional motor pulley (or motor roller).

[Explanation of symbols]

 M: Motor R: Reduction gear 110: Pipe 112: Motor shaft 113: First shaft 116: External gear 118: Internal gear 120: Second shaft (fixed bush) 150: Mounting shaft 156: Spring 170, 172: Inner Port 190: swing shaft

Claims (7)

[Claims] 1. A structure in which a motor and a speed reducer are provided in a pipe, and the rotation of the motor is reduced by the speed reducer and transmitted to the pipe, wherein the speed reducer receives the rotation of the motor. A shaft, an external gear that is incorporated on the outer periphery of the first shaft so as to be eccentrically rotatable and rotatable with respect to the first shaft, an internal gear that internally meshes with the external gear, and an external gear. And a second shaft coupled to the external gear so as to absorb an eccentric oscillating component of the external gear. And a pair of mounting shafts that are held rotatably relative to the pipe via the bearings and that are non-rotatably mounted on an external member. The motor includes the pair of mounting shafts. With its motor shaft facing the center of the pipe A first shaft of the speed reducer is connected to a motor shaft directed toward the center; a second shaft of the speed reducer is connected to the other of the pair of mounting shafts so that they cannot rotate relative to each other; The internal gear of the speed reducer is connected to the pipe so that the internal gear cannot rotate relative to the pipe. 2. A pipe drive with a built-in motor according to claim 1, wherein at least one of said pair of mounting shafts is slidable and returnable along a pipe axial direction by a spring. Construction. 3. The apparatus according to claim 1, further comprising a pair of inner supports that rotate integrally with the pipe at both axial positions of the speed reducer, wherein the internal gear of the speed reducer includes the inner support. A pipe drive structure with a built-in motor, wherein the pipe drive structure is connected to the pipe so as not to rotate relatively. 4. The pipe drive structure according to claim 3, wherein the first shaft of the motor and the first shaft of the speed reducer are also supported by bearings incorporated in the inner support, respectively. 5. The motor built-in type according to claim 1, wherein the motor and the first shaft of the speed reducer are connected in such a manner as to be able to absorb a slight misalignment between the two shafts. Pipe drive structure. 6. The external gear side and the second shaft side according to claim 1, wherein the second shaft is connected to the external gear of the speed reducer so as to absorb an eccentric oscillating component of the external gear. And the other end of the oscillating shaft and the second shaft are connected to each other by a large spline. A pipe drive structure with a built-in motor. 7. The external gear side and the second shaft side according to claim 1, wherein the second shaft is connected to the external gear of the speed reducer so as to be able to absorb an eccentric oscillating component of the external gear. A pivot shaft is interposed therebetween, and one end of the pivot shaft and the external gear, and the other end of the pivot shaft and the second shaft are connected by a universal joint, respectively. Built-in motor driven pipe drive structure.