JP2001227556A - Shaft connecting device and massage machine furnished with this shaft connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain cost and to absorb slippage of shaft centers of a driving shaft and a driven shaft and slippage of angles. SOLUTION: Cross-sections of end parts 6c, 12a of a motor shaft 6a and a worm 12 are respectively formed in a non-circular shape, and fitting parts 54, 55 in which the end parts 6c, 12a of the motor shaft 6a and the worm 12 are fitted in a state of having a clearance are formed on a shaft coupling 53 on a device to connect the motor shaft 6a as a driving shaft supported free to rotate to the worm 12 as a driven shaft supported free to rotate through the shaft coupling 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shaft connecting device for connecting a drive shaft to a driven shaft by a shaft coupling, and the shaft connecting device.
The present invention relates to a massage machine that performs massage using a treatment roller provided on a driven shaft.

[0002]

2. Description of the Related Art As a massage machine having a conventional shaft connecting device, as shown in FIGS.
A motor 6 attached to the main body case 1 by a mounting bracket 8 via a vibration isolating rubber 7 on a side opposite to the motor shaft 6a as a drive shaft, and a worm 12 as a driven shaft connected to the motor shaft 6a. And a speed reducer 10 comprising a worm wheel 11. The rotation of the motor 6 is transmitted to the rotation shaft 9 connected to the worm wheel 11 via the speed reducer 10, and the treatment roller (not shown) is rotated by the rotation of the rotation shaft 9. It is known to massage the treatment site.

[0003] A shaft connecting device of this massage machine is shown in FIG.
As shown in FIG. 2, the motor shaft 6a having the end 6c cut in two sides 6d (see FIG. 13), the worm 12, and the end 12a of the worm 12
The width of the motor shaft 6a is slightly larger than the width of the motor shaft 6a.
The two-sided cut 6d is fitted to the fitting portion 12b of the end 12a of the worm 12 to connect the motor shaft 6a and the worm 12.

[0004] In such a shaft coupling device, deviations in the axis and angle between the motor shaft 6a and the worm 12 occur due to variations in parts and assembly. Since the deviation of the axis and the deviation of the angle between the motor shaft 6a and the worm 12 can be absorbed only by a small gap between the fitting portion 12b, the deviation of the axis and the deviation of the angle due to the accuracy of parts and assembly. In some cases could not be absorbed. In this case, the motor shaft 6a is
A collision sound is generated when pressed by the second shaft 2b, giving the user discomfort, or vibrating due to excessive force acting between the motor shaft 6a and the fitting portion 12b. In addition, if the precision of parts and assembly is increased so that the deviation of the axis and the deviation of the angle can be accommodated by the gap, the cost increases.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft connecting device capable of suppressing a cost and absorbing a deviation of an axis or an angle between a driving shaft and a driven shaft.

[0006]

According to a first aspect of the present invention, a drive shaft rotatably supported is connected to a rotatably supported driven shaft via a shaft coupling. The drive shaft and the driven shaft each having a non-circular cross-section at the end thereof, and the shaft joint having a fitting portion with which the drive shaft and the driven shaft end are fitted with a gap. It is.

Thus, by forming the cross sections of the ends of the drive shaft and the driven shaft in a non-circular shape, the rotation of the drive shaft can be transmitted to the driven shaft via the shaft coupling, and the end of the drive shaft or the driven shaft can be transmitted. Not only one of the gaps between the shaft and the fitting part, but also the gap between the axes of the drive shaft and the driven shaft can be absorbed by using both the gaps. More can be absorbed.

In the above configuration, it is desirable that at least one of the fitting portions on the drive shaft side or the driven shaft side is formed in a tapered shape that widens from the back toward the opening side.

Thus, even if an angle shift between the drive shaft and the driven shaft occurs, the angle shift can be absorbed by the taper formed in the fitting portion, and a larger angle shift can be absorbed.

It is preferable that an elastic body having a shape along the end is fitted into at least one of the end of the drive shaft and the end of the driven shaft, and the elastic is fitted into a fitting part of the shaft joint.

Thus, the end in which the elastic body is fitted and the fitting portion are not in direct contact with each other but in contact with each other through the elastic body, so that there is a gap between the end in which the elastic body is fitted and the fitting portion. The sound generated in can be further reduced.

Further, at least one flat portion is formed on the outer periphery of the elastic body, and the surface of the fitting portion facing the flat portion of the elastic body is formed to project toward the flat portion side of the elastic body. It is desirable to have a surface.

Thus, when the motor is driven, the flat portion of the elastic body and the arc surface of the fitting portion are pressed against each other to transmit the rotation of the motor. Working surface pressure can be reduced.

Further, at least one flat portion is formed on the outer periphery of the elastic body, and at least substantially half of a surface of the fitting portion facing the flat portion of the elastic body in a circumferential direction is at least half.
The elastic body may have an arc surface protruding toward the flat surface side.

With this, when the motor is driven, the flat portion of the elastic body and the arc surface of the fitting portion are pressed against each other to transmit the rotation of the motor. Working surface pressure can be reduced.

More specifically, the shaft connecting device has a motor for rotating a drive shaft and a treatment roller rotated by a driven shaft, and is used in a massage machine for massaging a treatment site by the treatment roller. Things.

[0017] Thus, it is possible to suppress the occurrence of collision noise or vibration that gives the user discomfort while using the massage machine, and it is possible to perform comfortable massage.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 8, which show a massage machine as an example.

Reference numeral 1 denotes a main body case made of a synthetic resin having a U-shape in plan view, which is configured to be vertically splittable into two parts. A massage roller and a rotation roller, which are treatment rollers, which will be described later, are provided between the opposed mounting bases 2 and 3 of the main body case 1. A portion connecting the mounting bases 2 and 3 of the main body case 1 becomes a handle 4. Reference numerals 5 denote legs for installing the main body case on the floor.

A drive unit including a motor 6, a speed reducer 10 for reducing the rotation of the motor 6, and a shaft connecting device for connecting the motor 6 and the speed reducer 10 is provided in the main body case 1. In addition, the driving of the driving unit rotates the rotating shaft 9 to which a massaging roller and a rotating roller, which will be described later, are attached, to perform massage. Reference numeral 13 denotes a control unit for controlling the motor 6, and 14 denotes a power cord.

The motor 6 is fixed to the mounting base 3 on the side opposite to the motor shaft 6a by a mounting bracket 8 via a vibration isolating rubber 7, while being fitted to a gear case described later on the motor shaft 6a side. The cylindrical portion 6b is formed concentrically with the motor shaft 6a. The end 6c of the motor shaft 6a has a two-sided cut 6d (see FIG. 5) to have a non-circular cross section. An elastic body 51 (made of rubber in this embodiment) is fitted into the end 6c. This elastic body 51 has a shape along the end 6c of the motor shaft 6a,
The two flat portions 51a are formed.

The speed reducer 10 forms an outer shell with a gear case 10a divided into two parts. This gear case 10a
A worm 12 as a driven shaft rotatably held via a bearing 52 and a worm wheel 11 rotated by the worm 12 are provided therein. The rotating shaft 9 is fixed to the worm wheel 11. The worm 12 protrudes from the bearing 52 on the motor 6 side, and the protruding end 12a is formed in a non-circular gear shape. The gear case 10a is formed coaxially with the worm 12 with a fitting hole 10b into which the cylindrical portion 6b of the motor 6 is fitted.
a is located substantially coaxially with the worm 12.

The motor shaft 6a and the worm 12 of the speed reducer 10 are, as shown in FIG.
Are connected by An end 6c of the motor shaft 6a in which the elastic body 51 is fitted is fitted to one end of the shaft coupling 53 in a state having a slight gap (this gap is exaggerated in the figure). A fitting portion 54 is formed. The fitting portion 54 is formed such that a surface 54a of the elastic body 51 facing the flat portion 51a is formed in a tapered shape in which the distance between the flat portion and the opening increases from the back to the opening, and as shown in FIG.
It is formed on an arc surface protruding toward the a side. On the other end side, the worm 12 has a shape along the end 12a of the worm 12, and has a slight gap between the worm 12 (this gap is exaggerated in the figure). End 1
A fitting portion 55 into which 2a is fitted is formed.

The motor shaft 6a, the worm 12, the shaft coupling 53, and the elastic body 51 constitute a shaft connecting device. Due to the accuracy of parts and assembling, this shaft connecting device has a shaft center deviation n (here, a case where the shaft center is shifted to the upper left side) between the shaft center l of the motor shaft 6a and the shaft center m of the worm 12, as shown in FIG. Occurs as an example). At this time, the shaft coupling device is connected to the motor shaft 6a by an amount corresponding to both the gap between the end 6c of the motor shaft 6a and the fitting portion 54 and the gap between the end 12a of the worm 12 and the fitting portion 55. The axial misalignment between the worm 12 and the worm 12 can be absorbed. Therefore, a larger displacement of the axis can be absorbed. Also, the end 6c of the motor shaft 6a
Since the elastic body 51 is fitted into the fitting portion 54 by fitting the elastic body 51 into the fitting portion 54, the displacement of the axial center larger than the deformation of the elastic body 51 can be absorbed as shown in FIG.

Further, depending on the accuracy of parts and assembly, there may be a case where an angular displacement p occurs between the motor shaft 6a and the worm 12, as shown in FIG. In this case, the end 6 of the motor shaft 6a
The gap between c and the fitting portion 54 and the gap between the end 12a of the worm 12 and the fitting portion 55 can be absorbed by the gap, and the fitting portion 54 on the side where the elastic body 51 is fitted can be absorbed. Since the taper is formed so that the interval becomes wider from the back toward the opening, no excessive force acts even if the taper is inclined by the amount of the taper, and the angle shift can be absorbed. Therefore, a larger angle shift can be absorbed.

When the motor 6 is driven,
When the motor shaft 6a rotates in the fitting portion 54 of the shaft coupling 53 from the state shown in FIG. 5, the flat portion 51a of the elastic body 51 faces the flat portion 51a of the fitting portion 54 as shown in FIG. 54
a. Since the surface 54a of the fitting portion 54 facing the flat portion 51a is formed as an arc surface protruding toward the flat portion 51a, the fitting portion 54 has a small area on the end side of the flat portion 51a of the elastic body 51. It can be pressed over a wide area without being pressed. Also, since the arc surface is formed symmetrically,
The elastic body 51 is not only rotated in the clockwise direction shown in FIG. 8 but also rotated in the clockwise direction.
Can be pressed in a wide area without being pressed by the fitting portion 54 in a small area on the outer peripheral side of the flat portion 51a. This allows
The surface pressure acting on the elastic body 51 can be suppressed,
Life can be extended. At this time, the end 6 of the motor shaft 6a is
c is not directly pressed by the fitting portion 54,
Since the elastic body 51 is pressed through the elastic member 51, it is possible to reduce the generation of a collision sound when pressed.

The rotary shaft 9 driven by the drive unit is rotatably supported by bearings 15, 15 between opposing walls of the mounting bases 2, 3. The bearings 15, 15 are sandwiched between the upper and lower body cases 1.

A pair of rubbing rollers 16, 16 inclined in opposite directions are attached to the center of the rotating shaft 9, and outside the pair of rubbing rollers 16,
Rotary rollers 25, 25 are attached.

The rotating roller 25 includes a cylindrical first base 27 fixed to the rotating shaft 9 and having a flange 26 at one end and an open end at the other end, and an open end at the other end of the first base 27. A disk-shaped second base 28 to be closed, a plurality of roller shafts 29 bridged between the flange 26 and the second base 28 in parallel with the rotating shaft 9, and rotatably mounted on the roller shaft 29. And two types of rollers 30 and 31. One 30 is formed with two stimulating projections 32 having the same shape, and the other 30 is formed with a large stimulating projection 33 on both sides.
In the figure, a flat stimulating projection 34 is formed therebetween. There are, for example, ten roller shafts 9, and rollers 30 and 31 are alternately mounted on the shaft 9.

The rotation of the rotating shaft 9 rotates the rotating roller 25, and the stimulating projections 32, 33, 34 of the rollers 30, 31.
Massages a treatment part such as a foot.

The rubbing roller 16 is fixed in the rotating direction with respect to the rotating shaft 9 and is mounted so as to be slidable in the axis L direction. An idler 19 is rotatably mounted in an inclined state via a steel ball 18.

The idler portion 19 is composed of an outer annular pressing plate 20 having sliding surfaces with respect to the steel balls 18, an inner annular pressing plate 21, and a kneading member made of an elastic body sandwiched between the two annular pressing plates 20, 21. And a body 22. A plurality of openings are arranged in the inner annular holding plate 21 in the circumferential direction, and elastic projections 44 formed on the massaging body 22 from the openings.
Is protruding. These two annular holding plates 20 and 21 are connected by screws (not shown).

Then, when the rotating shaft 9 rotates, the kneading base 1 is rotated.
7 rotates, but the idling portion 19 moves the legs by the idling portions 19 and 19.
When a load is applied, for example, when the load is applied, the non-rotational state is maintained with the rolling of the hard sphere 18, and the idler 19 is attached in a state of being inclined not parallel to the axis L of the rotating shaft 9. Change the tilt angle with respect to the rotation axis 9,
The operation of moving toward and away from the opposing surface is repeated. Therefore, it is possible to massage a treatment portion such as a foot sandwiched between them. At this time, the elastic projections 44 of the massaging body 22 come into contact with and press against the treatment target.

As shown in FIG. 1, a coil spring 37 which constantly urges the rubbing rollers 16 in a direction approaching each other is wound between the pair of rubbing rollers 16 and the rotating roller 25 in a compressed state. A spacer 40 is fixed to the rotating shaft 9 between the pair of rubbing rollers 16, 16, and the pair of rubbing rollers 16, 1 urged by the coil spring 37.
6 are regulated.

Thus, when a treatment portion such as a foot is inserted between the rubbing rollers 16 and rubbing, when a large force is applied to the rubbing body 22, the coil spring 37 is compressed and the pair of rubbing rollers 16 and 16 is compressed. Evacuate away from each other,
It is intended to prevent an excessive pressure from being applied to a foot which is a treatment part. Therefore, massage can be performed even with a wide foot.

The spacer 40 is provided with two auxiliary rollers 38 rotatably. This is used, for example, when stimulating the soles of the feet while rubbing the feet with the rubbing rollers 16.

The kneading rollers 16 and 16 and the rotating roller 2
5 is a cover sheet 35 made of, for example, nylon, which is rich in flexibility.
And the body to be massaged is prevented from directly contacting both rollers 16 and 25 to improve safety. Also the first
A large number of ribs 36 are formed on the outer periphery of the base 27 to prevent the cover sheet 35 from being rolled up during massage.

With the above configuration, the motor shaft 6
The cross-section of the end 6c of the motor shaft 6a and the end 12a of the worm 12 is formed into a non-circular two-sided cut 6d shape or gear shape, so that the rotation of the motor shaft 6a is transmitted to the worm 12 via the shaft coupling 53. It can transmit, and the end 6c of the motor shaft 6a.
And fitting portion 54 or end portion 12a of worm 12 and fitting portion 5
5, the gap and the angular deviation between the motor shaft 6a and the worm 12 can be absorbed by using both the gaps, and the axial deviation and the angular deviation can be increased. Can be absorbed. Therefore, it is not necessary to increase the accuracy of parts and assembly, and it is possible to reduce costs and suppress occurrence of collision noise and vibration that may cause discomfort to the user caused by misalignment of the shaft center and angle, thereby enabling comfortable use. .

Further, by providing the above-mentioned shaft connecting device in the above-mentioned massage machine, it is possible to reduce the occurrence of collision sounds and vibrations that cause discomfort to the user during use of the massage machine, and to perform comfortable massage. .

In the above-described embodiment, the surface 54a of the elastic portion 51 of the fitting portion 54 facing the flat portion 51a is a circular arc surface. However, as shown in FIG. 5
At least approximately half of the surface 54a facing the one flat portion 51a in the circumferential direction may be an arc surface 54b protruding toward the flat portion 51a of the elastic body 51, and a plurality of the arc surfaces 54b may be formed. In this case, as shown in FIG.
Can be pressed against the arc surface 54b,
As in the above embodiment, the pressing area can be increased, and the surface pressure acting on the elastic body 51 can be reduced.

Here, as shown in FIG. 9, arc surfaces 54b are formed at a plurality of places (here, four places), and the two flat portions 51a are formed in both the clockwise and counterclockwise directions.
Is preferably pressed, but only one position may be pressed.

The two flat portions 51a are formed on the elastic body 51, and the surface 54a of the fitting portion 54 facing the flat portion 51a of the elastic body 51 is an arc surface, and the two flat portions 51a are pressed against the arc surface. It is desirable to reduce the surface pressure acting on the elastic body 51 by forming one flat portion 51a on the elastic body 51, and the surface 54a of the fitting portion 54 facing the flat surface 51a of the elastic body 51 is an arc surface. May be formed. Also, a large number of flat portions 51 a are formed on the elastic body 51, and the elastic body 5 of the fitting portion 54 is formed.
The surface 54a facing the one flat portion 51a may be an arc surface.

The elastic body 51 is connected to the end 6 of the motor shaft 6a.
c, but the end 12 of the worm 12 on the driven shaft side.
a, or both.

Also, as in the above embodiment, the motor shaft 6
The fitting 6a of the shaft coupling 53 is fitted to the end 6c of the motor a through the elastic body 51, and the generation of sound when the end 6c side of the motor is pressed by the fitting 54 by the elastic body 51 is reduced. It is preferable that the motor shaft 6 not be interposed through the elastic body 51.
Alternatively, the end 6c may be directly fitted to the fitting portion 54 of the shaft coupling 53.

[0045]

According to the first aspect of the present invention, the rotation of the drive shaft can be transmitted to the driven shaft via the shaft coupling by forming the cross sections of the ends of the drive shaft and the driven shaft to be non-circular. By utilizing not only one of the gap between the end of the drive shaft or the driven shaft and the fitting portion of the shaft coupling, but also the gap between the two, the misalignment and the angular misalignment between the drive shaft and the driven shaft are absorbed. Therefore, it is possible to further absorb the deviation of the axial center and the deviation of the angle. Therefore, it is not necessary to increase the accuracy of parts and assembly, and it is possible to reduce costs and suppress occurrence of collision noise and vibration that may cause discomfort to the user caused by misalignment of the shaft center and angle, thereby enabling comfortable use. .

According to the second aspect, even if an angle shift between the drive shaft and the driven shaft occurs, it can be absorbed by the taper formed in the fitting portion of the shaft joint, and a larger angle shift can be absorbed. Therefore, it is possible to more reliably suppress the occurrence of collision noise and vibration that may cause discomfort to the user due to the displacement of the axis or the displacement of the angle, and the device can be used comfortably.

According to the third aspect, since the elastic body fitted into the end is pressed against the fitting part, the collision sound generated between the end and the fitting part can be reduced by the elastic body. Can be used more comfortably.

According to the fourth aspect, when the motor is driven, the flat portion of the elastic body and the arc surface of the fitting portion are pressed against each other to transmit the rotation of the motor, but the pressed area is large. The surface pressure acting on the elastic body can be reduced. Therefore, the life of the elastic body can be prolonged, and the hardness of the elastic body can be reduced to more effectively suppress vibration and collision sound.

According to the sixth aspect, it is possible to suppress the occurrence of a collision sound or a vibration that gives a discomfort to the user while using the massage machine, and it is possible to perform a comfortable massage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a massage machine of the present invention.

FIG. 2 is a side vertical sectional view of the massage machine.

FIG. 3 is a detailed view of a part A in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a sectional view taken along line CC in FIG. 3;

6 is a plan view of the motor and the speed reducer in FIG. 1 in a state where the motor shaft and the speed reducer are misaligned with each other;

FIG. 7 is a side cross-sectional view when the motor shaft and the worm of the speed reducer have an angular deviation in FIG. 3;

FIG. 8 is a cross-sectional view when the motor shaft rotates in FIG. 3 and the elastic body is pressed against the arc surface of the fitting portion.

FIG. 9 is a cross-sectional view showing another embodiment of the fitting portion.

FIG. 10 is a cross-sectional view when the motor shaft rotates and the elastic body is pressed against the arc surface of the fitting portion in FIG. 9;

FIG. 11 is a side sectional view of a conventional massage machine.

FIG. 12 is a detailed view of a portion E in FIG. 11;

13 is a sectional view taken along line FF in FIG.

[Explanation of symbols]

 Reference Signs List 6 motor 6a motor shaft (drive shaft) 6c end of motor shaft 12 worm (driven shaft) 12a end of worm 16 kneading roller (treatment roller) 25 rotating roller (treatment roller) 51 elastic body 51a flat portion 53 shaft coupling 54 , 55 fitting part

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshiki Takama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 4C100 AE06 AE11 AF02 AF04 AF05 AF11 BB03 BC03 CA09 DA10 DA11

Claims (6)

[Claims] 1. A device for connecting a rotatably supported drive shaft to a rotatably supported driven shaft via a shaft coupling, wherein the drive shaft and the driven shaft each have a non-circular cross section at an end. A shaft coupling device in which a fitting portion is formed in the shaft coupling so that ends of the drive shaft and the driven shaft are fitted with a gap therebetween. 2. The shaft coupling device according to claim 1, wherein at least one of the fitting portions on the drive shaft side or the driven shaft side is formed in a tapered shape that widens from the back toward the opening side. 3. An elastic body having a shape along the end is fitted into at least one of the end of the drive shaft or the end of the driven shaft, and the elastic body is fitted into the fitting part of the shaft joint. Or the shaft connecting device according to claim 2. 4. An arc having at least one flat portion formed on the outer periphery of the elastic body and projecting a surface of the fitting portion facing the flat portion of the elastic body toward the flat portion of the elastic body. The shaft connecting device according to claim 3, which is a surface. 5. At least one flat portion is formed on the outer periphery of the elastic body, and at least substantially half of the surface of the fitting portion facing the flat portion of the elastic body in the circumferential direction is at least half of the elastic body. The shaft connecting device according to claim 3, wherein the shaft connecting device has an arc surface protruding toward the flat surface. 6. A massager having a motor for rotating a drive shaft and a treatment roller rotated by a driven shaft, wherein the treatment roller massages a treatment site by the treatment roller. Machine.