JP2003278845A - Parallel gear head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parallel gear head which materializes space savings and reduction of power transmitting members while securing safety, and allows increase of the inner diameter of a hollow part of an output shaft without enlarging the whole gear head. <P>SOLUTION: In a parallel gear head 100 accommodating a parallel shaft reduction mechanism in which axial lines of an input shaft and an output shaft are made in parallel with each other, while using a hollow shaft having a hollow part 102a for inserting a mating machine as the output shaft 102, the hollow part 102a is freely rotatably supported with a needle bearing 120. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel gear head most suitable for application to a geared motor or the like used in a drive system such as a conveyor of a physical distribution system.

[0002]

2. Description of the Related Art Conventionally, in a geared motor used in a drive system such as a conveyor of a physical distribution system, in a region where the capacity is relatively small (less than 0.1 kW), the speed reduction mechanism is
For example, a parallel shaft type gear head as shown in FIG. 6 is applied.

The parallel gear head 2 decelerates the rotation input from the motor shaft (the input shaft of the parallel gear head 2) by a gear pair of three stages, and outputs it from an output shaft 10. Output shaft 10
Is solid and is rotatably supported by the casing 16 by a pair of ball bearings 12 and 14.

As seen in this example, in general, the geared motor 4 is often set such that the outer shape of the motor 6 and the outer shape of the parallel gear head 2 are set to substantially the same size, and the geared motor 4 is connected so as to be as uneven as possible. , Is being made compact.

[0005]

However, since a solid shaft is used as the output shaft 10 in the parallel gear head 2 and the solid shaft has a structure protruding to the outside of the apparatus, the entire geared motor 4 is used as the shaft. It is difficult to reduce the size in the direction, and the solid shaft will rotate outside the casing 16 of the parallel gear head 2. Therefore, in order to ensure safety, a member that covers the output shaft 10 and the like depending on the application. However, there is a problem that a wide space is required for mounting the geared motor 4.

To solve this problem, for example, it is conceivable to use a hollow shaft having a hollow portion for inserting a driven shaft as an output shaft, and accordingly, space saving and reduction of power transmission members are realized. it can. However, when the output shaft 10 described above is simply a hollow hollow shaft, the inner diameter size of the hollow portion is small, and the driven shaft that can be inserted is also thin, resulting in a new problem that the strength is weakened. Occur. Therefore, if an attempt is made to increase the inner diameter size of the hollow portion, the gear head itself will become larger in the radial direction of the output shaft, and eventually there will be a problem that the device cannot be downsized.

The present invention has been made to solve such a problem, and realizes space saving and reduction of power transmission members while ensuring safety, and at the same time, reduces the size of the entire gear head. An object of the present invention is to provide a parallel gear head having an output shaft in which the inner diameter size of the hollow portion is large without increasing the size.

[0008]

According to the present invention, in a parallel gear head that accommodates a parallel shaft speed reducing mechanism in which an input shaft and an output shaft are parallel to each other, a hollow portion for inserting a driven shaft as the output shaft is provided. The hollow shaft is used and the hollow portion is rotatably supported by a needle bearing, thereby solving the above problems.

First, according to the present invention, since the hollow shaft having the hollow portion for inserting the other machine is used as the output shaft, the power transmission member such as the coupling can be reduced, and at the same time, the output shaft can be reduced. The drive shaft can be inserted inside the hollow shaft, and even when incorporated in a driven device such as a conveyor, the entire device can be downsized and space can be saved.

Further, since the hollow portion of the output shaft is rotatably supported by a needle bearing having a thin outer ring, the device can be downsized as compared with the case where it is supported by using a ball bearing or the like. At the same time, the inner diameter size of the hollow portion can be increased at the same time.

If the output shaft and the needle bearing can be replaced with an output shaft using a solid shaft and a ball bearing that rotatably supports the output shaft, the hollow shaft can be replaced only by replacing some parts. The parallel gear head of the type can be changed to the parallel gear head of the solid shaft type relatively easily. Therefore, it becomes possible to share the main parts such as gears that form the parallel gear head, and at the same time, depending on the design, it is possible to use a common mold for manufacturing the casing and the like. It is possible to reduce. Moreover, since the main parts of the two types of parallel gear heads are the same, it is possible to proceed with development at the same time and shorten the delivery time.

Further, since one side in the axial direction of the hollow portion has a bottom, the one end side of the output shaft can be housed in the case if necessary. In this case, since the output shaft can be supported in a state of being cut off from the outside of the case, the lubricating oil inside the device is less likely to leak to the outside than when the hollow portion is formed as a through hole. On the other hand, even if it is not housed in the case, the outer diameter of the bottomed portion can be reduced, which facilitates the design of the seal mechanism.

Moreover, since the seal pressure load applied to the output shaft from the sealing device such as the oil seal can be further reduced at least on one side of the output shaft, it is possible to prevent power loss and, depending on the design, It is also possible to realize cost reduction by reducing the number of parts.

In order to machine the keyway of the bottomed output shaft, it is generally preferable to provide a through hole that penetrates the inner circumference side and the outer circumference in a part of the inner circumference of the hollow portion. However, if the through hole is structured to be closed by the inner circumference of the gear fixedly mounted on the output shaft, it is possible to prevent the oil from leaking to the outside through the through hole without providing a separate sealing mechanism.

The needle bearing has a shell shape and is press-fitted into the casing of the parallel gear head, and
If the side surface of the gear is in contact with the side surface of the shell type needle bearing, the movement of the output shaft in the axial direction is restricted by the side surface of the shell type needle bearing,
The needle bearing can also function as a positioning means.

[0016]

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 to which a parallel gear head 100 according to an embodiment of the present invention is applied, and FIG. 2 is a developed sectional view of the parallel gear head 100. The geared motor 300 is a parallel gear head 100.
And a motor 200. The outer dimensions of the parallel gear head 100 and the motor 200 are substantially the same.

The parallel gear head 100 includes a motor 20
0 motor shaft (hereinafter referred to as the input shaft) 202, and the first
The shaft 104, the second shaft 106, the third shaft 108, and the output shaft 102 are provided.

The input shaft (motor shaft) 202 has its tip directly toothed, is inserted into the casing 130 of the parallel gear head 100, and meshes with the first gear 110 provided on the first shaft 104. The first gear set of the parallel gear head 100 is configured.

The first shaft 104 is rotatably supported by ball bearings 122b and 122c on both sides thereof, and has the large-diameter first gear 110 that rotates about its axial center L2, and the second shaft having a smaller diameter than the first gear 110. Gears 111 and are provided.

The second shaft 106 has, at both ends thereof,
It is rotatably supported by ball bearings 122d and 122e, and is arranged in parallel with the first shaft 104 with L3 as its axis. The second shaft 106 meshes with the second gear 111, has a third gear 112 having a larger diameter than the second gear 111, and a fourth gear 11 having a smaller diameter than the third gear 112.
3 and 3 are provided.

The third shaft 108 is rotatably supported at its both ends by ball bearings 122f and 122g, and is arranged parallel to the first shaft 104 and the second shaft 106 with L4 as its axis. The third shaft 108 is provided with a fifth gear 114 having a larger diameter than the fourth gear 113 and a sixth gear 115 having a smaller diameter than the fifth gear 114, which meshes with the fourth gear 113.

The output shaft 102 is a hollow shaft having a hollow portion 102a, and one end (right side in FIG. 1) of the axial direction L5 thereof has a bottom. That is, the output shaft 102 includes the hollow portion 102a as well as the hollow portion 102a.
It has a smaller diameter solid part 102b.

The output shaft 102 has a hollow portion 102a.
However, due to the needle bearing 120,
b are rotatably supported by ball bearings 122a. The needle bearing 120 has a shell (outer shell) whose surface is hardened,
The so-called "shell type" is adopted, and the casing body 13
It is pressed into 0b.

Further, the sixth gear 1 is attached to the output shaft 102.
A seventh gear 116 that meshes with the gear 15 is provided. The seventh gear 116 has a through hole 1 provided in the output shaft 102.
It is press-fitted and arranged on the output shaft 102 so as to close 02c. The through hole 102c is a through hole provided to form the key groove 102e on the output shaft 102. or,
The side surface 116a of the seventh gear 116 is in contact with the side surface 120a of the needle bearing 120.

An oil seal (sealing device) 132 is provided between the casing body 130b and the output shaft 102 to prevent the lubricating oil from leaking from the inside of the casing body 130b.
Is installed.

On the other hand, as is apparent from FIG. 1, the output shaft 10
One side of 2 (the side of the solid part 102b) is the casing 13
It is completely housed in 0 and there is no oil seal. In addition, in the casing body 130b, a retaining ring groove 134 for installing a retaining ring 156, which will be described later, is provided in a ring shape along the outer periphery of the needle bearing 120.

Next, the operation of the geared motor 300 to which the parallel gear head 100 according to this embodiment is applied 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 end portion of the input shaft 202, and the second gear 111 provided on the same first shaft 104 as the first gear 110
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 111.

At the same time as the rotation of the second gear 111,
A third gear 112 meshing with the gear 111, and the third gear 1
The fourth gear 113 provided on the same second shaft 106 as 12 rotates about the axis L3 of the second shaft 106, and the rotation transmitted from the second gear 111 is decelerated.

Further, at the same time as the rotation of the fourth gear 113, the fifth gear 114 meshing with the fourth gear 113 and the sixth shaft 115 provided on the same third shaft 108 as the fifth gear 114 are the third shafts. Rotation is about the axis L4 of 108, and the rotation transmitted from the fourth gear 113 is further reduced.

Finally, by the rotation of the sixth gear 115,
The seventh gear 116 that meshes with the sixth gear 115 rotates, and the output shaft 102 rotates, and power is output.

FIG. 3 is a side sectional view of a solid shaft parallel geared motor 400 to which a solid shaft type parallel gear head (hereinafter, simply referred to as a solid shaft parallel gear head) 150 is applied. The solid shaft parallel gear head 150 of the solid shaft parallel geared motor 400 is the output shaft 102 of the parallel gear head 100.
And needle bearing 120 (set of),
An output shaft (hereinafter, simply referred to as a solid output shaft) 152 using a solid shaft and a ball bearing 154 (a set of the ball bearings) 154 that rotatably supports the solid output shaft 152 are installed. It should be noted that, for the same or similar parts as the geared motor 300, their reference numerals and explanations are omitted.

As is clear from the drawing, the solid shaft parallel gear head 150 has a solid output shaft 152 different from the components of the parallel gear head 100, a ball bearing 154,
The retaining ring 156, the oil seal 158 having a diameter larger than that of the oil seal 132 of the parallel gear head 100, and the spacer 1
And 60. However, the other parts including the casing 130 that constitutes the solid-axis parallel gear head 150 are shared with the parallel gear head 100 described above.

More specifically, the solid output shaft 15
2 is a ball bearing 154 and a parallel gear head 10
It is rotatably supported by a ball bearing 122a which can be commonly used with 0.

A retaining ring 156 is provided in the retaining ring groove 134 provided in the casing body 130b.
The retaining ring 156 regulates the movement of the seventh gear 116 provided on the solid output shaft 152 in the axial direction L5 via the ball bearing 154 and the spacer 160.
It functions as a positioning means for the solid output shaft 152.

On the other hand, if a solid shaft parallel gear head 550 as shown in FIG. 4 is used as a base, it is possible to change to a hollow shaft type parallel gear head 500 as shown in FIG. 5 by only part of machining and parts replacement. Is also possible. That is, a part of the casing 530 of the solid shaft parallel gear head 550 (a part shaded in the figure) 530C is processed, and the solid output shaft 152 and the ball bearing 154 are replaced.
The hollow shaft type output shaft 102 and the needle bearing 120 are installed, and the oil seal 158c is set to 132.
It is also possible to change to a parallel shaft gear head 500 having a hollow shaft simply by exchanging. In this case, the casing 530 itself cannot be shared,
The mold for forming the casings 130 and 530 can be shared, and other parts constituting the parallel shaft gear head 500 can be shared with the solid shaft parallel gear head 550 except for the oil seal 158c.

The parallel gear head 100 according to the example of the embodiment of the present invention uses the hollow shaft having the hollow portion 102a for inserting the driven shaft as the output shaft 102, and the connecting member with the driven shaft is unnecessary. Since it is possible to reduce the number of power transmission members and the driven shaft can be inserted inside the hollow shaft, the overall size and space of the device can be reduced even when incorporated in a driven device such as a conveyor. can do.

Further, since the hollow portion 102a of the output shaft 102 is rotatably supported by the needle bearing 120 having a thin outer ring, the size of the apparatus can be reduced as compared with the case of supporting the ball bearing or the like. While realizing, at the same time, the inner diameter size of the hollow portion 102a can be increased.

Also, one side of the hollow portion 102a in the axial direction L5 has a bottom and one side of the output shaft 102a (the hollow portion 1).
02b) is completely housed in the casing 130, so that the hollow portion 102a is formed as a through hole, and a sealing device such as an oil seal is installed at both ends of the hollow portion 102a.
Lubricating oil inside the device is unlikely to leak to the outside, and since the oil seal 132 may be installed only on one side of the output shaft 102, the load applied to the output shaft 102 is reduced, and power loss can be prevented. At the same time, it is possible to realize cost reduction by reducing the number of parts.

Since the through hole 102c provided to form the key groove 102e of the output shaft 102 is closed by the inner circumference of the seventh gear 116 provided on the output shaft 102, oil is allowed to pass through the through hole 102c. It can be prevented from leaking. Further, the side surface 116a of the seventh gear 116 is in contact with the side surface 120a of the needle bearing 120 press-fitted into the casing body 130b,
The needle bearing 120 also functions as a positioning unit that restricts the movement of the output shaft 102 in the axial direction L5.

The output shaft 102 and the needle bearing 120, the output shaft 152 using a solid shaft, and the output shaft 1
Since the ball bearing 154 that rotatably supports the 52 is replaceable, only by replacing some parts,
The hollow shaft type parallel gear head 100 can be easily changed to the solid shaft type parallel gear head 150. Therefore, it becomes possible to share the main parts such as the gears that form the parallel gear head 100 and the solid-axis parallel gear head 150, and at the same time, the mold for manufacturing the casing and the like can be used in common. The cost can be reduced. Moreover, since the main parts of the two types of parallel gear heads 100 and 150 are the same, development can be advanced at the same time, and the delivery time can be shortened.

As described above, when the solid shaft parallel gear head 550 having the casing 530 different from the solid shaft type parallel gear head 150 is used as a base, when the solid output shaft 152 is used, the retaining ring 156 is used. Is unnecessary, and the oil seal 158 is also a smaller oil seal 15
It can be 8c. Furthermore, it is possible to change to the parallel gear head 500 having a hollow shaft while realizing the sharing of main parts such as gears.

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

Although one of the output shafts 102 has a bottom,
The present invention is not limited to this, and the bottomed side does not necessarily have to be housed in the casing 130.

[0046]

According to the present invention, it is possible to realize space saving and reduction of power transmission members while ensuring safety, and at the same time, increase the inner diameter of the hollow portion without increasing the size of the entire gear head. A parallel gear head having an output shaft can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view of a geared motor to which a parallel gear head according to an embodiment of the present invention is applied.

FIG. 2 is a developed sectional view of the parallel gear head in FIG.

FIG. 3 is a side sectional view when the parallel gear head in FIG. 1 is changed to a solid shaft parallel gear head.

FIG. 4 is a side sectional view of a geared motor to which a solid shaft parallel gear head is applied.

5 is a side cross-sectional view when the solid shaft parallel gear head in FIG. 4 is changed to a hollow shaft parallel gear head.

FIG. 6 is a side sectional view of a geared motor to which a conventional solid type parallel gear head is applied.

[Explanation of symbols]

100, 500 ... Parallel gear head 102 ... Output shaft 104 ... First shaft 106 ... Second shaft 108 ... Third shaft 110, 111, 112, 113, 114, 115, 1
16 ... Gear 120 ... Shell type needle bearings 122a, 122b, 122c, 122d, 122e,
122f, 122g, 154 ... Ball bearing 130, 530 ... Casing 132, 158 ... Oil seal 150, 550 ... Solid shaft gear head 152 ... Solid output shaft 156 ... Retaining ring 160 ... Spacer 200 ... Motor 202 ... Motor shaft 300 ... Geared motor 400 ... Solid shaft geared motor

Claims (5)

[Claims] 1. A parallel gearhead containing a parallel shaft reduction mechanism in which an input shaft and an output shaft are parallel to each other, and a hollow shaft having a hollow portion into which a driven shaft is inserted is used as the output shaft. A parallel gear head characterized in that the hollow part is rotatably supported by a needle bearing. 2. A parallel gear head, wherein the output shaft and the needle bearing in claim 1 can be replaced with an output shaft using a solid shaft and a ball bearing rotatably supporting the output shaft. 3. The parallel gear head according to claim 1, wherein one side of the hollow portion in the axial direction has a bottom. 4. The gear according to claim 3, further comprising a gear fixed to the output shaft and rotating about an axis of the output shaft, wherein a part of the inner circumference of the hollow portion is connected to the inner circumference side. A parallel gear head, characterized in that a through hole provided through the outer circumference is closed by the inner circumference of the gear. 5. The needle bearing according to claim 4, wherein the needle bearing has a shell shape and is press-fitted into a casing of a parallel gear head, and a side surface of the gear is in contact with a side surface of the shell type needle bearing. Parallel gear head to.