JPH10122252A - Shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any knocks of a motor output shaft and a speed reducer input shaft in time of the starting and stoppage of a motor roller as well as in time of a reversibly rotational changeover, from occurring. SOLUTION: A prismatic coupling shank 14aj applied with four-side cutting work is formed in one side shank 14a of a motor output shaft 14, and a square columnar coupling shank 16aj in an input shaft of a decelerating mechanismic part D likewise, respectively. On the other hand, a prismatic hole-form coupling hole 15j is installed in a shaft coupling 15 for connecting both these coupling shanks 14aj and 16aj, and an elastic body 20 such as rubber or the like is vulcanizingly bonded to a circumference of this coupling hole 15j. Subsequently, both these coupling shanks 14aj and 16aj are lightly pressed in a square hole in an inner part of the elastic body 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft coupling structure for transmitting torque between a motor output shaft and a reduction gear input shaft in a motor roller, for example.

[0002]

2. Description of the Related Art FIG. 5A is a longitudinal sectional view showing the vicinity of a shaft coupling between a motor output shaft and a reduction gear input shaft of a conventional motor roller, and FIG. 5B is a perspective view showing the shaft coupling structure. .

In FIG. 1, a motor mechanism M of a motor roller includes motor brackets 9 and 10, a stator 11 on which coil windings are wound, and a rotor 12 provided on the inner peripheral side of the stator 11 so as to face the rotor. , Rotor 12 and bearing 1
The motor output shaft 14 is rotatably supported via the motor shaft 3.

[0004] One shaft portion 14a of the motor output shaft 14 and the input shaft 16a of the speed reduction mechanism portion D are connected by a shaft coupling 50 to transmit torque.

The reduction mechanism D is a planetary gear reduction device having a two-stage reduction gear in the example shown in FIG.
b is connected to the input shaft 17a of the intermediate plate 17, and the intermediate plate 17 is fixed to the rotating drum 1, which is the outer cylinder of the motor roller.

As described above, the output shaft 1 of the motor mechanism M
4a and the input shaft 16a of the speed reduction mechanism D are connected by a shaft coupling (joint) so that torque can be transmitted. We do work such as cutting. FIG. 5 (b) shows the details of the shaft coupling structure, in which a square columnar coupling hole 50j is provided on the shaft coupling 50 side, and the shaft 14a,
On the 16a side, four-sided connecting shaft portions 14aj and 16aj are provided, and inserted and connected respectively.

[0007]

In the conventional motor roller shaft coupling structure, as described above, machining such as spline and four-sided cutting is performed on the shaft side and the shaft coupling side. For this reason, a gap in the rotational direction is generated at the joint between the shaft and the shaft joint in terms of processing accuracy and assembly accuracy.

On the other hand, for the motor output shaft, the reducer input shaft, and the shaft coupling, a "hard" material having a certain strength is selected because of the need for torque transmission.

As a result, when the motor is started / stopped and when the rotation is switched between the forward direction and the reverse direction, the shaft made of a material having high hardness and the shaft joint collide with each other due to a gap in the rotational direction, and an unpleasant hitting sound is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to reduce the tapping sound of a motor output shaft and a reduction gear input shaft at the time of starting / stopping a motor roller and switching between forward and reverse rotation. The purpose is to prevent it.

[0011]

According to a first aspect of the present invention, a drive shaft such as a motor output shaft of a motor roller is connected to a driven shaft such as an input shaft of a speed reduction mechanism, and torque is transmitted from the drive shaft to the driven shaft. In the transmitting shaft coupling, there is provided a coupling hole into which a polygonal cross section of a drive shaft and a driven shaft, for example, a coupling shaft portion having a rectangular cross section is inserted, and the coupling hole is larger than the polygonal cross section of each coupling shaft portion and An elastic body such as rubber is mounted on the inner periphery of the coupling hole, and the coupling shaft is inserted into the inner periphery of the elastic body, for example, lightly press-fitted.

According to the second aspect of the present invention, a hole is provided from the outer peripheral portion to the inner peripheral portion of the shaft coupling, and an elastic body such as rubber is attached (vulcanized) from the hole to the entire inner periphery of the coupling hole of the shaft coupling. Things.

According to a third aspect of the present invention, the maximum outer diameter R1 of the coupling shaft portion of the drive shaft or the driven shaft is formed to be equal to or larger than the minimum inner diameter R2 of the coupling hole.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a longitudinal sectional view showing the overall configuration of a motor roller according to the present invention, FIG. 2A is a longitudinal sectional view showing the vicinity of a joint between a motor output shaft and a reduction gear input shaft, and FIG. It is an expansion perspective view showing the shaft coupling structure by a form.

First, the overall structure of the motor roller 100 will be described. The rotating drum 1 serving as an outer cylinder is held at its both ends by side plates 2a and 2b, and the side plates 2a and 2b are rotatably attached to the shaft 3 and the slide shaft 4 via bearings 5 and 6, respectively. I have. The shaft 3 is provided with a connection line 7 for supplying electric power to the motor mechanism M from the outside.
A spring 8 is suspended between the shaft and the bearing 6, so that the spring 8 can be slidably mounted outside.

The motor mechanism M includes motor brackets 9 and 10 mounted on the shaft 3,
And a rotor 12 provided on the inner peripheral side of the stator 11 so as to face the inner circumference of the stator 11.
And a motor output shaft 14 to which the rotor 12 is mounted and which is rotatably supported on the motor brackets 9 and 10 via bearings 13.

One shaft 14a of the motor output shaft 14 and the input shaft 16a of the speed reduction mechanism D are connected by a shaft coupling 15 to transmit torque. Details of the configuration and operation will be described later.

The reduction mechanism section D is a planetary gear reduction device including a sun gear SG, a planetary gear PG, and an internal gear IG. In the illustrated example, the reduction gear section D is a two-stage reduction gear mechanism. The output shaft 16b of the speed reduction mechanism D is connected to the input shaft 17a of the intermediate plate 17, and the intermediate plate 17 is fixed to the rotary drum 1, which is the outer cylinder of the motor roller, and rotates integrally.

Next, the operation of the motor roller will be briefly described. Stator 11 from outside via connection line 7
When a current is supplied to the coil winding of the motor mechanism M, the rotor 12 of the motor mechanism M rotates around the stator 11, and the motor output shaft 14 is driven to rotate. Then, the rotational force is transmitted to the one shaft portion 14a of the motor output shaft 14, the shaft coupling 15, and the input shaft 16a of the speed reduction mechanism D, and is reduced to a desired rotation speed by the speed reduction mechanism D. The decelerated rotational driving force is
The power is transmitted to the outer drum 1 via the output shaft 16 b of the reduction mechanism D and the intermediate plate 17. When the rotary drum 1 rotates, the luggage and the like placed thereon are conveyed in a predetermined direction.

FIG. 2B shows a joint structure between the motor output shaft and the input shaft of the speed reduction mechanism D in this embodiment.
That is, the one shaft portion 14a of the motor output shaft 14 is formed with a quadrangular prism-shaped coupling shaft portion 14aj having a four-sided cut, and the input shaft 16a of the reduction mechanism D is formed with the same quadrangular prism-shaped coupling shaft portion 16aj. On the other hand, the coupling shaft 14aj,
A square column-shaped coupling hole 50j is provided in the shaft joint 15 for coupling 16aj, and an elastic body 20 such as rubber (natural or synthetic) is vulcanized and bonded around the coupling hole. This elastic body 20
The inner diameter of the square hole inside is formed such that the coupling shaft portion 14aj of the motor output shaft and the coupling shaft portion 16aj of the reduction mechanism input shaft are lightly press-fitted.

Therefore, as shown in FIG. 3, the torque transmitted from the motor output shaft 14 to the input shaft 16a of the reduction mechanism D is first received by the elastic body 20 such as rubber. And shared by the shaft coupling 15.

As described above, according to the first embodiment, the coupling shaft portions 14aj, 16aj of the motor output shaft and the reduction gear input shaft are lightly press-fitted into the elastic body 20 mounted on the shaft coupling 15, so that the motor At the time of starting / stopping, it is possible to completely eliminate the tapping sound of the motor output shaft and the reducer input shaft at the time of switching the motor forward / reverse rotation.

Further, the motor output shaft 14 is connected to the speed reduction mechanism D
When the torque transmitted to the input shaft 16a increases, the structure is such that the torque is received by both the elastic body 20 and the shaft coupling 15, so that the durability of the elastic body 20 (rubber) is improved, and the torque transmission is also improved. It is done reliably.

Embodiment 2 FIG. In the second embodiment, FIG.
As shown in (a), a hole 15 h is provided from the outer diameter portion to the inner diameter portion of the shaft coupling 15, and an elastic body such as rubber flows into the hole 15 h from the hole 15 h. The elastic body 20 is formed. Other configurations are the same as those of the first embodiment.

According to the second embodiment, since the elastic body 20 such as rubber flows from the outer diameter portion of the shaft joint 15 through the hole 15h, the shaft joint 15 of the elastic body 20 such as rubber is formed. The bonding strength of the device is increased, the torque transmission function is secured, and the reliability of the device is increased.

Although FIG. 4 (a) shows a case in which one hole 15h is provided from the outer diameter portion to the inner diameter portion of the shaft coupling 15, the provision of a plurality of holes can enhance the adhesive strength.

Embodiment 3 In the third embodiment,
The dimensional relationship between the inner diameter of the shaft coupling 15 and the outer diameter of the shafts 14aj and 16aj is defined. That is, as shown in FIG. 4B, the minimum inner diameter (radius) of the shaft coupling 15 is R2, and the maximum outer diameter (radius) of the coupling shaft portions 14aj and 16aj of the motor output shaft or the reduction gear input shaft is R1. The dimensions are determined so that R1 ≧ R2. By doing so, the elastic body 2 such as rubber
Even if a material having low adhesive strength or high softness is used as 0, the coupling shaft portion 14a of the motor output shaft or the reducer input shaft may be used.
The torque can be reliably transmitted without the j and 16aj running idle around the inner peripheral portion of the shaft coupling 15.

Other Embodiments In the above embodiment, the coupling shaft portion 14a of the motor output shaft and the speed reducer input shaft
Although the shape of the coupling hole 15j of the shaft joint 15 has been shown as a prismatic shape with a four-sided cut processing, other shapes having a polygonal shape (triangular, pentagonal, hexagonal, etc.) may be used. However, the square shape is more convenient for processing and assembly, and is superior in strength and torque transmission performance.

Although the coupling shaft portions 14aj, 16aj and the coupling hole 15j have the same sectional area in the axial direction, they may have a taper from the entrance of the coupling hole to the inside of the coupling.

Furthermore, the coupling shaft portion 14aj of the motor output shaft and the coupling shaft portion 16aj of the reduction gear input shaft have the same size and shape, and the inner diameter of the shaft coupling 15 and the inner diameter of the elastic body 20 are the same at both ends. Dimensions of coupling shafts 14aj and 16aj
The same effect is obtained even with a shaft coupling structure having a different shape.

[0031]

According to the first aspect of the present invention, since the coupling shaft portion of the drive shaft and the driven shaft is inserted into the elastic body attached to the shaft coupling, the rotation can be switched between forward and reverse when starting and stopping. At this time, the hitting sound due to the collision between the drive shaft and the driven shaft can be completely eliminated.

Further, when the torque transmitted from the drive shaft to the driven shaft increases, the torque is received by both the elastic member and the shaft coupling, so that the durability of the elastic member is improved and the torque transmission is ensured. Done in

According to the second aspect of the present invention, since the elastic body is formed by flowing the elastic body from the outer diameter portion of the shaft joint through the hole, the adhesive strength of the elastic body to the shaft joint is increased, and the torque transmitting function is improved. And increase the reliability of the equipment.

According to the third aspect of the present invention, even when a material having low adhesive strength or high softness is used as the elastic body, the coupling shaft of the drive shaft or the driven shaft idles around the inner peripheral portion of the shaft coupling. Without transmitting the torque, the torque can be reliably transmitted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entire configuration of a motor roller according to the present invention.

FIG. 2 is a longitudinal sectional view showing the vicinity of a joint between a motor output shaft and a reduction gear input shaft according to the first embodiment, and an enlarged perspective view showing a shaft joint structure.

FIG. 3 is a graph showing torque transmission characteristics of the shaft coupling according to the first embodiment.

4A is a perspective view showing a shaft coupling structure according to a second embodiment, and FIG. 4B is a front view showing a shaft coupling according to a third embodiment.
It is.

FIG. 5 is a longitudinal sectional view showing the vicinity of a conventional shaft coupling between a motor output shaft and a reduction gear input shaft, and an enlarged perspective view showing a shaft coupling structure.

[Explanation of symbols]

1 rotary drum, M motor mechanism, 14 motor output shaft, 14aj coupling shaft, 15 shaft coupling, 15j coupling hole, D reduction mechanism, 16a input shaft of reduction mechanism D,
16aj Coupling shaft part, 20 elastic body, 100 motor roller.

Claims (3)

[Claims] 1. A coupling in which a drive shaft and a driven shaft are connected and torque is transmitted from the drive shaft to the driven shaft, wherein a coupling shaft portion having a polygonal cross section of the drive shaft and the driven shaft is inserted. A hole having a polygonal cross section that is larger and similar to the polygonal cross section of each of the coupling shafts, and an elastic body is attached to the inner periphery of the coupling hole;
A shaft coupling in which the coupling shaft is inserted into the inner periphery of the elastic body. 2. The shaft coupling according to claim 1, wherein a hole is provided from an outer peripheral portion to an inner peripheral portion of the shaft coupling, and the elastic body is attached from the hole to an inner periphery of the coupling hole. 3. The shaft coupling according to claim 1, wherein a maximum outer diameter R1 of the coupling shaft portion of the drive shaft or the driven shaft is formed to be equal to or larger than a minimum internal diameter R2 of the coupling hole. .