JP2003269552A - Geared motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor capable of reducing the size of the whole device in particular in the radial direction while securing its original safety, saving the space and reducing power transfer members by using a hollow shaft as an output shaft. <P>SOLUTION: This geared motor 300 has a motor 200 and a deceleration mechanism 100, and uses a hollow shaft having a hollow part 102a for inserting a partner machine as an output shaft 102 of the deceleration mechanisms 100. The output shaft 102 is disposed so as to be shifted in parallel to a motor shaft 202 of the motor 200, and the plane of projection of the output shaft 102 in an axial direction L4 is stored in a cross section F0 of the motor 200 in an axial direction L1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geared motor used in a drive system such as a conveyor of a physical distribution system, and in particular, a motor and a so-called hollow shaft type reduction mechanism.

[0002]

2. Description of the Related Art Conventionally, geared motors have been widely used in drive systems such as conveyors of physical distribution systems.

Further, as the output shaft of the speed reducing mechanism applied to these geared motors, there is known one using a hollow shaft having a hollow portion into which a driven shaft is inserted. This hollow shaft type output shaft does not require a connecting member with the mating machine side, so it is possible to reduce the number of power transmission members, and the driven shaft can be inserted inside the hollow shaft, so that it can be driven by a conveyor or the like. Even when incorporated in a device, it has features that it can ensure safety, downsize the entire device, and save space, and there is a strong need for it.

As a geared motor having a hollow shaft output shaft, depending on the application, for example, Japanese Patent Laid-Open No. 6-5448.
Orthogonal shaft type geared motor using a hypoid gear set as described in JP-A-2001-193
A parallel shaft type geared motor as described in 801 is used.

[0005]

However, in the orthogonal shaft type geared motor disclosed in Japanese Unexamined Patent Publication No. 6-54483, the output shaft is arranged in the direction orthogonal to the input shaft, and therefore the driven shaft is arranged relative to the driven shaft. However, there is a problem that the device becomes large in a direction orthogonal to each other.

On the other hand, in the parallel shaft type geared motor disclosed in Japanese Unexamined Patent Publication No. 2001-193801, the output shaft is arranged in parallel to the input shaft. Although the device can be downsized, simply arranging the input and output axes in parallel makes the device large in the radial direction, and it is difficult to make the entire device compact. In particular, when a hollow shaft type is used for the output shaft and the inner diameter of the hollow portion is increased, the size of the device is inevitable. Therefore, not only is the shape elongated in the axial direction of the motor, but also a geared motor that is long in the radial direction is configured, so not only the entire device becomes large, but also the device is difficult to install, There were problems such as bulky inventory space.

The present invention has been made in order to solve such a problem, and by using a hollow shaft as an output shaft, the original safety is secured, space is saved, and power transmission members are reduced. It is an object of the present invention to provide a geared motor that realizes the above and at the same time makes the entire device compact, particularly in the radial direction.

[0008]

SUMMARY OF THE INVENTION The present invention provides a geared motor using a hollow shaft having a motor and a reduction mechanism, and having a hollow portion for inserting a driven shaft as an output shaft of the reduction mechanism. The problem is solved by arranging the shaft in parallel with the motor shaft of the motor and arranging the projection plane of the output shaft in the axial direction within the axial cross section of the motor.

According to the present invention, the output shaft of the hollow shaft is "shifted in parallel to the motor shaft" and the projection surface in the axial direction thereof is accommodated within the axial cross section of the motor, whereby the output shaft of the hollow shaft is moved in the axial direction of the input / output shaft. Not only is it compact, but there are no extra protrusions in the radial direction, and it is possible to make a shape that is close to a rectangular parallelepiped shape or a cylindrical shape as a whole. Therefore, the installation becomes easy especially in an installation place where there is no space in the radial direction, and even when a large number of geared motors are secured in inventory, no wasteful space is generated and the problem that the inventory space is bulky is solved. become able to.

The output shaft is an output shaft of a gear head having a multi-stage speed reduction mechanism, is rotatably supported in the gear head casing, and the motor shaft is inserted into the gear head casing. The first stage gear set of the reduction mechanism may be configured by using a pinion directly attached to the motor shaft or attached to the pinion.

With such a construction, even when a geared motor is constructed by combining a motor and a parallel gear head, not only a compact geared motor can be constructed in the axial direction of the input / output shaft but also the motor shaft Since it rotates inside the casing, it becomes possible to secure further safety.

Further, the output shaft has, in addition to the hollow portion, a solid portion having a diameter smaller than that of the hollow portion, and the axial projection plane of the motor shaft intersects the axial projection plane of the hollow portion. In the case where the geared motor is arranged so as not to intersect with the axial direction of the solid portion, the geared motor can be made compact in the radial direction, and at the same time, the inner diameter size of the hollow portion of the output shaft can be increased. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a geared motor 300 according to an example of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG. Geared motor 300
Includes a parallel gear head 100 and a motor 200.

The parallel gear head 100 includes a motor shaft (hereinafter referred to as an input shaft) 202 of a motor and a first shaft 10.
4, the second shaft 106, and the output shaft 102.

The first shaft 104 has, at both ends thereof,
The first shaft 104 is rotatably supported by bearings 122c and 122d, and the first shaft 104 is provided with a large-diameter first gear 110 and a smaller-diameter second gear 112 that rotate about an axis L2 thereof. .

Further, the second shaft 106 is arranged in parallel with the first shaft 104 with the position corresponding to L3 in the drawing as the axis center on the back side of the drawing. The second shaft 106 meshes with the second gear 112 and has a third gear 114 having a larger diameter than the second gear 112 and a fourth gear 116 having a smaller diameter than the third gear 114.
And are provided. The second shaft 106 is rotatably supported at its both ends by bearings (not shown).

The output shaft 102 is a hollow shaft having a hollow portion 102a, and one end of the output shaft 102 in the axial direction L4 (right side in FIG. 1) is bottomed. That is, the output shaft 102 includes the hollow portion 102a as well as the hollow portion 102a.
It has a solid portion 102b with a diameter smaller than a. This solid part 10
The tip 102d of 2b is in contact with the cover 130a forming a part of the casing 130 via a slide bearing 122e. The cover 130a is formed by the casing body 13
0b and a seal ring 131 and a bolt (not shown) are integrated with each other, and the casing 130 of the parallel gear head 100 is constituted by the both 130a and 130b.

The output shaft 102 has a hollow portion 102a.
Is the bearing 122a, and the solid part 102b is the bearing 122a.
Each of them is rotatably supported by b.

On the other hand, the input shaft (motor shaft) 202 is
The tip of the parallel gear head 1 is directly toothed.
00 is inserted into the casing 130 and meshes with the first gear 110 provided on the first shaft 104, and the parallel gear head 1
The first gear set of 00 is configured.

The output shaft 102 and the input shaft 202 are, as shown in FIG. 2, a projection plane F3 in the axial direction L1 of the input shaft 202.
Intersects with the projection plane F1 of the hollow portion 102a of the output shaft 102 in the axial direction L4, but the axial direction L4 of the solid portion 102b.
Is arranged so as not to intersect with the projection plane F2. Furthermore, the output shaft 102 is arranged such that the projection plane F4 of the output shaft 102 in the axial direction L4 is within the axial direction L1 cross section F0 of the motor 200.

The output shaft 102 has the fourth gear 11
A fifth gear 118 meshing with the gear 6 is provided. The fifth gear 118 has a through hole 10 provided in the output shaft 102.
It is press-fitted and arranged on the output shaft 102 so as to close 2c. The through hole 102c is a through hole provided to form the key groove 102e of the output shaft 102.

An oil seal (sealing device) 120 is installed between the casing body 130b and the other end of the output shaft 102 to prevent the lubricating oil from leaking from the inside of the casing body 130b. On the other hand, as is apparent from FIG. 1, one side of the output shaft 102 (the side of the solid portion 102b)
Is completely contained in the casing 130, and no oil seal is provided.

Next, the geared motor 3 according to this embodiment
The operation of 00 will be described.

When the motor 200 is energized, the input shaft 202
Rotates about its axis L1, and the first gear 110 meshed with the tip of the input shaft 202 and the second gear 112 provided on the same first shaft 104 as the first gear 110 are
It rotates around the axis L2 of the shaft 104. At this time, the rotation of the input shaft 202 causes the input shaft 202 and the first gear 110 to rotate.
It is decelerated by the ratio of the number of teeth and transmitted to the second gear 112.

At the same time as the rotation of the second gear 112,
A third gear 114 meshing with the gear 112 and the third gear 1
The fourth gear 116 provided on the same second shaft 106 as 14 rotates about the axis L3 of the second shaft 106, and the rotation transmitted from the second gear 112 is further decelerated.

Finally, by the rotation of the fourth gear 116,
The fifth gear 118 meshing with the fourth gear 116 rotates, the output shaft 102 rotates, and power is output.

In the geared motor 300 according to the embodiment of the present invention, the output shaft 102 and the input shaft 202 are intentionally "parallel" and not "coaxial" but "shifted". Hereinafter, this operation will be described.

Generally, when the hollow shaft type output shaft and the input shaft (motor shaft) are made "orthogonal",
The shape often becomes large both in the axial direction of the motor and in the axial direction of the output shaft. That is, the motor is generally long in the axial direction, while the hollow shaft tends to be long in the radial direction because the hollow shaft requires a certain span to insert the driven shaft. In this embodiment, since the output shaft 102 and the input shaft 202 are parallel to each other, the size in the radial direction does not increase even if the insertion span of the output shaft 102 is made slightly longer.

Next, in the present embodiment, the output shaft 10
Since the 2 and the input shaft 202 are not coaxial with each other and are “shifted”, the following operation is obtained.

That is, the output shaft and the motor shaft are not made orthogonal to each other,
Moreover, when it is attempted to make the respective axes coincide with each other, a structure using a planetary gear mechanism is generally adopted. However, in a device using a planetary gear mechanism, it is often difficult to reduce the size in the radial direction while having a large space in the center, and the cost is likely to increase.

On the other hand, if an attempt is made to make the axis of the input shaft and the axis of the output shaft coincide with each other by using the parallel shaft gear mechanism, the shaft is shaken in parallel and then returned again. In such a case, the useless space where the gears do not exist becomes inevitably large, and as a result, the size in the radial direction also becomes large.

Further, since the two shafts are supported on the same shaft by independent bearing pairs, the size in the axial direction tends to be large.

In this embodiment, as described above, the output shaft 102 of the hollow shaft is arranged in parallel with the input shaft 202, and the projection plane F4 of the output shaft 102 in the axial direction L4 of the motor 200 is arranged. Axial direction L1 cross section F
Since the geared motor 300 can be made compact in the axial direction L1 because it is housed within 0, the space inside the casing can be effectively used in the radial direction as well, and there is no extra protrusion, and the rectangular parallelepiped as a whole. A geared motor 300 close to the shape can be configured. Therefore, the installation location of the geared motor 300 is not limited by the shape of the geared motor 300, and the installation of the geared motor 300 is easy. Further, even when a large number of geared motors 300 are secured as an inventory, a problem that the inventory space becomes bulky can be solved without generating a wasteful space.

The displacement e between the axis of the output shaft 102 and the axis of the input shaft 202 can be suppressed to be less than the radius of the motor 200 at the maximum. Therefore, when the output shaft 102 is coupled so as to cover the driven shaft, the influence of the vibration of the motor 200, which is a vibrating element of the output shaft 102, on the output shaft 102 can be relatively suppressed. (The output shaft 10 of the force to vibrate the output shaft 102
2 has a small moment). Therefore, it can be stably attached to the driven shaft.

A projection plane F3 in the axial direction L1 of the input shaft 202
Intersects with the projection plane F1 of the hollow portion 102a of the output shaft 102 in the axial direction L4, but the axial direction L4 of the solid portion 102b.
By arranging the input shaft 202 and the output shaft 102 so as not to intersect with the projection plane F2, the shift e of the axis center of the input / output shaft is reduced as much as possible and the cross section perpendicular to the input / output shaft is made compact. While realizing, at the same time, the inner diameter size of the hollow portion 102a of the output shaft 102 can be increased.

The tip of the input shaft 202 is directly toothed, and the casing 1 of the parallel gear head 100 is
Since the first gear set of the parallel gear head 100 is formed by meshing with the first gear 110 provided in the first shaft 104, the geared motor 300 has a compact shape in the axial direction L1 as a whole. Along with
Since the input shaft 202 rotates inside the casing 130, safety can be ensured.

In the above embodiment, the reduction mechanism has a three-stage gear structure, but the present invention is not limited to this.

The arrangement of the input shaft 202 and the output shaft 102 is not limited to the arrangement shown in FIG. Further, the output shaft 102 does not necessarily need to be accommodated on the bottom side in the casing 130, and the hollow portion 102 of the output shaft 102 is not required.
You may form a as a through hole.

Although the tip portion of the motor shaft 202 is directly tooth-cut, a pinion may be attached to form the first-stage gear set of the reduction mechanism.

In the above embodiment, the tip of the hollow portion 102b of the output shaft 102 is covered with the cover 130a and the slide bearing 12 is provided.
Although the contact is made via the 2e, the cover 130a may be directly contacted without the slide bearing 122e.

[0042]

According to the present invention, by using the hollow shaft as the output shaft, the original safety can be secured, the space can be saved, and the number of power transmission members can be reduced. At the same time, the entire device can be made compact. In particular, it is possible to reduce the size in the radial direction.

[Brief description of drawings]

FIG. 1 is a side sectional view of a geared motor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

100 ... Parallel gear head 102 ... Output shaft 102a ... Hollow part of output shaft 102b ... Solid part of output shaft 104 ... 1st axis 106 ... second axis 110, 112, 114, 116, 118 ... Gears 130 ... Casing 130a ... cover 130b ... Casing body 131 ... Seal ring 200 ... Motor 202 ... Motor shaft 300 ... Geared motor

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Claims (3)

[Claims] 1. A geared motor using a hollow shaft having a motor and a speed reduction mechanism, and having a hollow portion for inserting a driven shaft as an output shaft of the speed reduction mechanism, wherein the output shaft is the motor shaft of the motor. A geared motor, wherein the geared motor is arranged so as to be parallel to each other, and the projection plane in the axial direction of the output shaft is accommodated within a cross section in the axial direction of the motor. 2. The output shaft of a parallel gear head according to claim 1, wherein the output shaft is a parallel gear head having a multi-stage reduction mechanism, and is rotatably supported in a casing of the gear head, and the motor shaft is the gear head. A geared motor in which the first-stage gear set of the speed reduction mechanism is configured by using a pinion that is directly toothed or mounted on the motor shaft by being inserted into the casing. 3. The output shaft according to claim 1, wherein the output shaft has a solid portion having a diameter smaller than that of the hollow portion, in addition to the hollow portion, and a projection plane in the axial direction of the motor shaft is defined by an axis line of the hollow portion. A geared motor characterized in that it is arranged so as to intersect with the directional projection plane but not with the axial projection plane of the solid portion.