JP2022187525A - magnetic bevel gear - Google Patents

Abstract

To provide a magnetic bevel gear which has good durability and quietness, and is suitable for easily preventing breakages and failures of an input shaft and an output shaft as well as apparatuses and mechanisms connected to them.SOLUTION: A magnetic bevel gear GE1 has a hole H into which an input shaft Sh1 or an output shaft Sh2 is fit, and a magnet bevel gear main body 1 having a magnetic face MS which extends radially centering at the hole and is inclined. When the magnetic bevel gear main body 1 attached to the input shaft is represented as a first magnetic bevel gear GE1(A) and the magnetic bevel gear main body 1 attached to the output shaft Sh2 is represented as a second magnetic bevel gear GE1(B), the magnetic face MS of the first magnetic bevel gear and the magnetic face MS of the second magnetic bevel gear lie opposite each other in a non-contact state, and power of the input shaft is transmitted to the output shaft via mutually attracting magnetic forces of the opposing magnetic faces.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a magnetic bevel gear which is excellent in durability and quietness and which is suitable for easily preventing damage or failure of an input shaft, an output shaft, and devices and mechanisms connected thereto.

2. Description of the Related Art Conventionally, a bevel gear is known as a mechanical element that transmits power. A bevel gear of this kind is mounted on each of the input and output shafts. When the input shaft rotates around its axis by a power source such as a motor, the bevel gear on the input shaft side and the bevel gear on the output shaft side rotate while being in contact with each other. rotate in synchronism with each other, and the power of the input shaft is transmitted to the output shaft.

However, according to the conventional bevel gear, as described above, the bevel gear on the input shaft side and the bevel gear on the output shaft side rotate while being in contact with each other. Therefore, the development of bevel gears with excellent durability and quietness was urgently needed. In addition, there is also the problem of generation of dust due to wear of the bevel gears, making it difficult to use conventional bevel gears in a clean environment.

By the way, in conventional bevel gears, when the load applied to the output shaft exceeds the allowable value, the input shaft, the output shaft, and the devices and mechanisms connected to them are prevented from being damaged or broken down. A step-out state is required in which the synchronized rotation of the shaft and the output shaft is lost.

However, when attempting to obtain the state of out-of-step with conventional bevel gears, for example, as means for releasing the engagement between the bevel gear on the input side and the bevel gear on the output shaft side, both bevel gears are disengaged. Since a separate relative separation mechanism or device is required, conventional bevel gears cannot easily prevent damage or failure of the input shaft, the output shaft, and the devices and mechanisms connected thereto.

JP 2017-180720

The present invention was made to solve the above-mentioned problems, and its purpose is to provide excellent durability and quietness, and to prevent damage to input shafts, output shafts, and devices and mechanisms connected thereto. To provide a magnetic bevel gear as a power transmission machine element suitable for easily preventing failures and failures.

To achieve the above object, the present invention provides a magnetic bevel gear attached to each of an input shaft and an output shaft for transmitting power of the input shaft to the output shaft, wherein the magnetic bevel gear is attached to the input shaft or the output shaft. a hole into which the output shaft is fitted; and a magnetic bevel gear body having magnetic surfaces radially expanding around the hole and inclined. and the magnetic gear body attached to the output shaft is a second magnetic bevel gear, the magnetic surface of the first magnetic bevel gear and the magnetic surface of the second magnetic bevel gear are opposed to each other in a non-contact state, and transmit the power of the input shaft to the output shaft via the magnetic force that the magnetic surfaces facing each other attract each other.

In the present invention, when the load applied to the output shaft exceeds the attractive magnetic force between the magnetic surfaces, the input shaft and the output shaft lose synchronous rotation. It may be characterized in that power transmission from the shaft to the output shaft is interrupted.

The present invention may be characterized in that the step-out timing is changed by adjusting the gap between the opposing magnetic surfaces or adjusting the attractive magnetic force between the opposing magnetic surfaces.

In the present invention, the magnetic surface may be composed of a plurality of magnet pieces arranged radially around the hole.

In the present invention, the magnetic surface may be characterized in that the N poles and S poles of the respective magnet pieces are arranged alternately.

The overall shape of the plurality of magnet pieces constituting the magnetic surface is composed of a plurality of first line segments along the radial direction of the hole and a plurality of segments inclined at a predetermined angle with respect to these first line segments. When a second line segment is set, the shape may be divided along the second line segment.

In the present invention, the direction of magnetic orientation of the magnet piece may be inclined within a range of minus 45 degrees to 90 degrees with respect to the magnetic surface.

In the present invention, when the outer edges of the magnet pieces forming the magnetic surface are all arc-shaped, and the N pole and the S pole forming the magnetic surface are each considered to be one pole, The arc length per pole may be equal between the first magnetic bevel gear and the second magnetic bevel gear.

In the present invention, the outer diameter of the magnetic surface in the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the magnetic When the outer diameter of the surface is φ2 and the number of poles of the N and S poles constituting the magnetic surface is b2, the rotation of the output shaft with respect to the input shaft is satisfied when the conditions φ2=φ1 and b2=b1 are satisfied. The speed may be characterized by a constant speed of 1/1.

In the present invention, the outer diameter of the magnetic surface in the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the magnetic When the outer diameter of the surface is φ2 and the number of poles of the N and S poles constituting the magnetic surface is b2, when the conditions φ2=2×φ1 and b2=2×b1 are satisfied, the input shaft The rotational speed of the output shaft may be reduced by 1/2.

In the present invention, the outer diameter of the magnetic surface in the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the magnetic When the outer diameter of the surface is φ2 and the number of poles of the N and S poles constituting the magnetic surface is b2, φ2=(1/2)×φ1 and b2=(1/2)×b1. is satisfied, the rotation speed of the output shaft with respect to the input shaft may be increased by 2/1.

The present invention may be characterized by including a structure for preventing the magnet pieces from jumping out.

In the present invention, the opening angle between the input shaft and the output shaft is the difference between the inclination angle of the magnetic surface of the first magnetic bevel gear and the inclination angle of the magnetic surface of the second magnetic bevel gear. It may be characterized by being the sum.

In the present invention, the magnetic force that attracts the magnetic surfaces is obtained by using an isotropic rare earth bonded magnet, an anisotropic rare earth sintered magnet, or a magnet having performance equivalent to these. may be

In the present invention, the magnetic surface may be coated with antirust plating or antirust coating.

In the present invention, as described above, the magnetic surfaces of the first magnetic bevel gear and the magnetic surfaces of the second magnetic bevel gear face each other in a non-contact manner, and the opposing magnetic surfaces attract each other. A configuration is adopted in which the power of the input shaft is transmitted to the output shaft via magnetic force. Therefore, it is possible to provide a magnetic bevel gear as a power transmission element that is excellent in durability and quietness without generating wear and noise unlike conventional bevel gears.

Further, according to the present invention, when the load applied to the output shaft exceeds the above-described magnetic force of attraction between the magnetic surfaces, the input shaft and the output shaft lose synchronism, causing the input shaft to lose synchronization. Since the power transmission to the output shaft is interrupted, the magnetic bevel gear as a power transmission element suitable for preventing damage or failure of the input shaft, the output shaft, and the devices and mechanisms connected to them is used. can provide.

1 is a cross-sectional view of a state (meshing state) in which a magnetic bevel gear (first embodiment) to which the present invention is applied is attached to an input shaft and an output shaft and assembled; (a) is a plan view of the magnetic bevel gear of FIG. 1, and (b) is a cross-sectional view of FIG. (a) is a front view of a state in which magnetic bevel gears (second embodiment) to which the present invention is applied are engaged, and (b) is a side view thereof. (a) is a plan view of a magnetic bevel gear (third embodiment) to which the present invention is applied, and (b) is a cross-sectional view in the direction of arrow B in (b). FIG. 5 is a cross-sectional view of a magnetic bevel gear to which the present invention is applied (fourth embodiment) assembled by attaching it to an input shaft and an output shaft (meshing state);

FIG. 1 is a cross-sectional view of a magnetic bevel gear (first embodiment) to which the present invention is applied, assembled by attaching it to an input shaft and an output shaft (meshing state), and FIG. A plan view of the magnetic bevel gear, and FIG. 2(b) is a cross-sectional view taken along line A in FIG.

Referring to FIGS. 1 and 2(a) and (b), the magnetic bevel gear GE1 is attached to each of the input shaft Sh1 and the output shaft Sh2, and means for transmitting the power of the input shaft Sh1 to the output shaft Sh2 (power transmission element). As specific components for realizing such a function, the magnetic bevel gear GE1 has a hole H into which the input shaft Sh1 or the output shaft Sh2 is fitted, and a magnetic surface MS that spreads radially around the hole H and is inclined. and a magnetic bevel gear body 1.

In the example of FIG. 1, the magnetic bevel gear main body 1 attached to the input shaft Sh1 is the first magnetic bevel gear GE1(A), and the magnetic bevel gear main body 1 attached to the output shaft Sh2 is the second magnetic bevel gear. GE1(B), the magnetic surface MS of the first magnetic bevel gear GE1(A) and the magnetic surface MS of the second magnetic bevel gear GE1(B) are separated from each other with a predetermined gap Gp. The power of the input shaft Sh1 is transmitted to the output shaft Sh2 via the magnetic force between the magnetic surfaces MS, which face each other in a non-contact state and attract each other.

In short, the combination of the first magnetic bevel gear GE1 (A) and the second magnetic bevel gear GE1 (B) replaces the conventional bevel gear engagement with the attractive force between the magnetic surfaces MS, MS. It is configured as a so-called non-contact bevel gear pair.

<<Details of magnetic surface MS>>
Referring to FIG. 2(a), as a specific configuration of the magnetic surfaces MS, in the magnetic bevel gear GE1 of FIG. 1, a plurality of magnetic surfaces MS ( 24 magnet pieces mg, mg . . . In this configuration, the magnetic surface MS is configured such that the N poles and S poles of the respective magnet pieces mg, mg . . . are arranged alternately on the same plane.

As a specific configuration of the magnetic surface MS, in the magnetic bevel gear GE1 of FIG. Although the magnet piece mg is configured to be divided with the line segment L1 of 1 as the boundary line, it is not limited to this. For example, it is also possible to adopt a configuration example of division as shown in FIGS. 3A and 3B described later.

Further, in the magnetic bevel gear GE1 of FIG. 1, as a specific example of the direction of magnetic orientation, as shown in FIG. Although it is configured to be in an inclined state, it is not limited to this. The direction of magnetic orientation can be changed as needed. For example, a direction of magnetic orientation as shown in FIG. 4B, which will be described later, may be adopted.

<Conditions of engagement between magnetic surfaces MS>
Referring to FIG. 2(a), the outer edges eg of the magnet pieces mg forming the magnetic surface MS are all arc-shaped. When each of the N and S poles forming the magnetic surface MS is considered to be one pole, the arc length n1 per pole is the same as that of the first magnetic bevel gear GE1 (A) and the second magnetic bevel gear GE1 (A). It is configured to be equal to the magnetic bevel gear GE1(B).

The arc length n1 per pole as described above corresponds to a module in a conventional bevel gear. ) and the second magnetic bevel gear GE1(B), magnetic meshing is established between the two magnetic gears GE1(A) and GE1(B), and the first magnetic bevel gear GE1(A ) to the second magnetic bevel gear GE1(B).

When the arc length n1 per pole differs between the first and second magnetic bevel gears GE1(A) and GE1(B), the above-mentioned It becomes difficult to establish meshing such as

《Example of rotation speed ratio (1:1)》
The outer diameter of the magnetic surface MS in the first magnetic bevel gear GE1 (A) is φ1 (see FIG. 1), the number of poles of the N pole and the S pole constituting the magnetic surface MS is b1, the second magnetic bevel gear, When the outer diameter of the magnetic surface in GE1 (B) is φ2 (see FIG. 1) and the number of poles of the N and S poles constituting the magnetic surface MS is b2, the conditions φ2=φ1 and b2=b1 is satisfied, the rotation speed of the output shaft with respect to the input shaft becomes 1/1 constant speed.

<<Example of rotational speed ratio (1:1/2)>>
FIG. 5 is a cross-sectional view of a state (engagement state) in which a magnetic bevel gear (fourth embodiment) to which the present invention is applied is attached to an input shaft and an output shaft and assembled. 5, the same members as those in FIG. 1 are given the same reference numerals.

As shown in FIG. 5, the outer diameter of the magnetic surface MS in the first magnetic bevel gear GE1 (A) is φ1, the number of N poles and S poles constituting the magnetic surface MS is b1, and the second magnetic When the outer diameter of the magnetic surface MS in the bevel gear GE1 (B) is φ2, and the number of poles of the N and S poles forming the magnetic surface MS is b2, φ2=2×φ1 and b2=2×b1. When the condition is satisfied, the rotational speed of the output shaft Sh2 relative to the input shaft Sh1 is reduced by half.

《Example of rotation speed ratio (1:2)》
Although not shown, the outer diameter of the magnetic surface MS in the first magnetic bevel gear GE3(A) is φ1, the number of N and S poles forming the magnetic surface MS is b1, and the second magnetic bevel gear When the outer diameter of the magnetic surface MS in GE3(B)1B is φ2, and the number of poles of the N and S poles constituting the magnetic surface MS is b2, φ2=(1/2)×φ1 and b2=( 1/2)×b1, the rotational speed of the output shaft Sh2 relative to the input shaft Sh1 is increased by 2/1.

<<Synchronous rotation and step-out of magnetic bevel gear pair (first and second magnetic bevel gears)>>
In the example of FIG. 1, the input shaft Sh1 and the output shaft Sh2 are rotatably supported by supporting means (not shown) such as bearings. The input shaft Sh1 is connected to the rotating shaft of an electric motor such as a servomotor, and the output shaft Sh2 is connected to a predetermined rotating mechanical element.

When the electric motor described above rotates at a predetermined number of revolutions, the input shaft Sh1 rotates about its axis, and the rotational force is applied to the first magnetic bevel gear GE1 (A) and the second magnetic bevel gear GE1 ( B) is transmitted to the output shaft Sh2, and the output shaft Sh2 rotates, for example, at the aforementioned gear ratio. In short, the output shaft Sh2 and the input shaft Sh1 are synchronously rotated by the first and second magnetic bevel gears GE1(A) and GE1(B).

At this time, the load applied to the output shaft Sh2 from the rotating mechanical elements may be substantially constant or fluctuate. When the load fluctuates and the load exceeds the attractive magnetic force between the magnetic surfaces MS, the first magnetic bevel gear GE1 (A) and the second magnetic bevel gear GE1 ( B) (specifically, a phenomenon in which the rotation of the second magnetic bevel gear GE1 (B) lags behind the rotation of the first magnetic bevel gear GE1 (A) and cannot follow). , the synchronous rotation of the input shaft Sh1 and the output shaft Sh2 is lost, and the power transmission from the input shaft Sh1 to the output shaft Sh2 is interrupted.

By interrupting power transmission due to step-out as described above, the aforementioned rotating mechanical elements are protected. Further, since the first magnetic bevel gear GE1(A) and the second magnetic bevel gear GE1(B) are non-contact, they are not damaged by the aforementioned excessive load.

Various methods are conceivable for setting the timing at which the aforementioned step-out occurs. For example, as a first method, the gap between the first magnetic bevel gear GE1 (A) and the second magnetic bevel gear GE1 (B) (specifically, the gap Gp between the opposing magnetic surfaces) is A method of adjusting the attractive magnetic force between the opposing magnetic surfaces MS by changing the magnetic force of the magnetic surfaces MS facing each other. A method of adjusting the magnetic force is conceivable, but it is not limited to these.

For example, as a third method, although the structure is somewhat complicated, when the load applied to the output shaft Sh2 is about to exceed the threshold value, a magnetic shield member can be interposed between the opposing magnetic surfaces MS. , the opposing magnetic surfaces MS, and a method of making the magnitude of the magnetic force that attracts each other closer to zero is also conceivable.

In short, the timing of stepping out has a close relationship with the magnitude of the magnetic force that attracts the opposing magnetic surfaces MS. good.

<<Embodiment of magnetic bevel gear main body 1 (parts configuration)>>
The magnetic bevel gear main body 1 of FIG. 1 is composed of three parts, specifically, a truncated cone-shaped magnet holder 100, a cover 101 attached to the lower outer periphery thereof, and the aforementioned magnet pieces mg.

At the center of the magnet holder 100, the above-described hole H is bored so as to penetrate the upper and lower surfaces of the magnet holder 100. As shown in FIG. Further, the above-described magnet piece mg is arranged on the slope of the magnet holder 100, and the magnetic umbrella shown in FIG. The gear body 1 has a magnet fixing structure (reference numerals omitted).

As a specific example of the magnet fixing structure, in the magnetic bevel gear main body 1 of FIG. By arranging the magnet piece mg in a state where the tip portion is covered, a configuration is adopted in which the magnet piece mg is positioned and fixed, and the magnet piece mg is prevented from coming off or jumping out. In this configuration, the upper claws 102A are provided on the magnet holder 100 and the lower claws 102B are provided on the cover 101, but the present invention is not limited to this.

《The angle formed by the rotary motion axes (input and output shafts) and its setting》
Referring to FIG. 1, the first and second magnetic bevel gears GE1(A) and GE1(B) rotate two rotary motion shafts (input shaft Sh1 and output shaft Sh2) at a predetermined angle α. At this time, the angle α (hereinafter referred to as the "opening angle α") is the inclination angle α1 of the magnetic surface MS with respect to the hole H in the first magnetic bevel gear GE1(A) and the second magnetic bevel gear GE1(B). is the sum of (α1+α2) with the inclination angle α2 of the magnetic surface MS with respect to the hole H in .

In the example of FIG. 1, both the inclination angle α1 of the magnetic surface MS in the first magnetic bevel gear GE1(A) and the inclination angle α2 of the magnetic surface MS in the second magnetic bevel gear GE1(B) are set to 45 degrees. Therefore, the input shaft Sh1 and the output shaft Sh2 are configured to rotate with an opening angle of 90 degrees.

Although illustration is omitted, for example, even when the inclination angle α1 is set to 30 degrees and the inclination angle α2 is set to 60 degrees, the input shaft Sh1 and the output shaft Sh2 are rotated with the total opening angle of 90 degrees. configured to

Further, for example, when the inclination angle α1 is set to 45 degrees and the inclination angle α2 is set to 30 degrees, the input shaft Sh1 and the output shaft Sh2 are configured to rotate with an opening angle of 75 degrees, which is the sum of them. .

<<Constituent material of magnet piece mg constituting magnetic surface MS>>
The attractive magnetic force between the magnetic surfaces MS can be obtained by using an isotropic rare earth bonded magnet, an anisotropic rare earth sintered magnet, or a magnet having performance equivalent to these as the aforementioned magnet piece mg. can be done.

At that time, rare earth magnets such as isotropic rare earth bonded magnets and anisotropic rare earth sintered magnets are relatively easy to rust. It is desirable to apply rust plating or antirust coating. This enables power transmission even underwater.

FIG. 3(a) is a front view of a state in which magnetic bevel gears (second embodiment) to which the present invention is applied are engaged, and FIG. 3(b) is a side view thereof. 3(a) and 3(b), the same members as in FIG. 1 are given the same reference numerals.

Referring to FIGS. 3(a) and 3(b), in the magnetic bevel gear GE2 of FIGS. 3(a) and 3(b), the specific configuration of the magnetic surface MS is A plurality of second line segments L2 inclined at a predetermined angle (index angle θ) are set by using the second line segments L2, and the plurality of magnet pieces mg are divided using the second line segments L2 as boundary lines. ing.

In the case of adopting the configuration divided by the indexing angle .theta. as described above, an effect similar to that of a conventional spiral bevel gear, that is, an improvement in cogging can be obtained.

In the magnetic bevel gear GE2 of FIGS. 3A and 3B, the second line segment L2 (boundary line) is a straight line, but is not limited to this. Although not shown, it is also possible to set the second line segment L2 as an involute curve, and divide the plurality of magnet pieces mg by using the involute curve as a boundary line.

FIG. 4(a) is a plan view of a magnetic bevel gear (third embodiment) to which the present invention is applied, and FIG. 4(b) is a cross-sectional view taken along line B in FIG. 4(b). 4(a) and 4(b), the same members as in FIG. 1 are given the same reference numerals.

Referring to FIGS. 4(a) and 4(b), in the magnetic bevel gear GE3 of FIGS. 4(a) and 4(b), the magnetic orientation direction of each magnet piece mg is is inclined minus 45 degrees with respect to the magnetic surface MS.

The magnetic piece mg having a magnetic orientation direction of minus 45 degrees as described above can be obtained, for example, by preparing a ring-shaped magnet (hereinafter referred to as a “ring magnet”) having north and south poles on the upper and lower surfaces, and It can be easily manufactured by chamfering and cutting the edge at a predetermined angle (45 degrees in the example of FIG. 4(b)) and dividing the ring magnet into a plurality of parts in the radial direction. Excellent.

The direction of the magnetic orientation of the magnet pieces mg described above is not limited to the above-described example, and is from minus 45 degrees (see FIG. See) can be configured to tilt within the range.

In each of the magnetic bevel gears GE1, GE2, and GE3 of the above-described embodiments, as a specific configuration, the magnetic surface MS of the first magnetic bevel gear GE1(A) and the second magnetic bevel gear The magnetic surfaces MS of GE1 (B) are opposed to each other in a non-contact state, and the power of the input shaft Sh1 is transmitted to the output shaft Sh2 via the magnetic force of attraction between the opposing magnetic surfaces MS, MS. Since this structure is adopted, it does not generate wear and noise like conventional bevel gears, and has excellent durability and quietness.

Further, according to the magnetic bevel gears GE1, GE2, and GE3 of each embodiment, when the load applied to the output shaft Sh1 exceeds the attractive magnetic force between the magnetic surfaces MS, MS, the synchronous rotation of the input shaft Sh1 and the output shaft Sh2 Power transmission from the input shaft Sh1 to the output shaft Sh2 is cut off due to loss of synchronism, resulting in damage to the input shaft Sh1, the output shaft Sh2, and the devices and mechanisms connected to them. It is suitable for preventing malfunction and failure.

The present invention is not limited to the above-described embodiments, and many modifications are possible within the scope of the technical idea of the present invention by means of ordinary creativity of those skilled in the art.

1 magnetic bevel gear main body 100 magnet holder 101 cover 102A upper claw (magnet piece jump-out prevention structure)
102B Lower claw (magnet piece jump-out prevention structure)
eg outer edge GE1 of magnet piece magnetic bevel gear GE1 (A) first magnetic bevel gear GE1 (B) second magnetic bevel gear H hole L1 first line segment L2 second line segment MS magnetic surface mg magnet piece n1 Arc length per pole Sh1 Input shaft and Sh2 Output shaft Gp Gap θ Indexing angle φ1 Outer diameter of magnetic surface of first magnetic bevel gear φ2 Outer diameter of magnetic surface of second magnetic bevel gear

Claims (15)

A magnetic bevel gear attached to each of the input shaft and the output shaft to transmit the power of the input shaft to the output shaft,
The magnetic bevel gear is
a hole into which the input shaft or the output shaft is fitted;
a magnetic bevel gear body having a magnetic surface radially expanding around the hole and inclined;
When the magnetic bevel gear main body attached to the input shaft is a first magnetic bevel gear and the magnetic gear main body attached to the output shaft is a second magnetic bevel gear, the first magnetic bevel gear The magnetic surface of the gear and the magnetic surface of the second magnetic bevel gear are opposed to each other in a non-contact state, and the power of the input shaft is applied to the input shaft through the magnetic force of attraction between the opposed magnetic surfaces. A magnetic bevel gear characterized by transmitting to an output shaft. When the load applied to the output shaft exceeds the attractive magnetic force between the magnetic surfaces, a step-out state occurs in which the synchronized rotation of the input shaft and the output shaft is lost. 2. The magnetic bevel gear according to claim 1, wherein power transmission to is interrupted. 3. The magnetic field according to claim 2, wherein the step-out timing is changed by adjusting the gap between the opposing magnetic surfaces or adjusting the attractive magnetic force between the opposing magnetic surfaces. bevel gear. The magnetic bevel gear according to any one of claims 1 to 3, wherein the magnetic surface is composed of a plurality of magnet pieces arranged radially around the hole. 5. The magnetic bevel gear according to claim 4, wherein the magnetic surfaces are arranged such that the N poles and S poles of the magnet pieces are alternately arranged. The overall shape of the plurality of magnet pieces constituting the magnetic surface is composed of a plurality of first line segments along the radial direction of the hole and a plurality of segments inclined at a predetermined angle with respect to these first line segments. 5. The magnetic bevel gear according to claim 4, wherein when a second line segment is set, the shape is divided along the second line segment. 7. The magnetic bevel gear according to claim 5, wherein the direction of magnetic orientation of the magnet piece is inclined within a range of minus 45 degrees to 90 degrees with respect to the magnetic surface. Each of the outer edges of the magnet pieces forming the magnetic surface has an arc shape. 7. The magnetic bevel gear according to claim 5, wherein the length of the circular arc is equal between the first magnetic bevel gear and the second magnetic bevel gear. The outer diameter of the magnetic surface of the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the outer diameter of the magnetic surface of the second magnetic bevel gear is When the conditions φ2=φ1 and b2=b1 are satisfied, where φ2 is the number of poles of the N and S poles that constitute the magnetic surface, the rotational speed of the output shaft with respect to the input shaft is 1/1. 7. The magnetic bevel gear according to claim 5 or 6, wherein the constant velocity of The outer diameter of the magnetic surface of the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the outer diameter of the magnetic surface of the second magnetic bevel gear is φ2, the rotational speed of the output shaft with respect to the input shaft when the conditions φ2=2×φ1 and b2=2×b1 are satisfied, where b2 is the number of the N and S poles forming the magnetic surface. 7. The magnetic bevel gear according to claim 5 or 6, characterized in that the speed reduction is 1/2. The outer diameter of the magnetic surface of the first magnetic bevel gear is φ1, the number of poles of the N pole and the S pole constituting the magnetic surface is b1, and the outer diameter of the magnetic surface of the second magnetic bevel gear is When φ2=(1/2)×φ1 and b2=(1/2)×b1 are satisfied, where b2 is the number of poles of the N and S poles forming the magnetic surface, 7. The magnetic bevel gear according to claim 5, wherein the rotation speed of the output shaft with respect to the input shaft is increased by 2/1. The magnetic bevel gear according to any one of claims 4 to 11, further comprising a structure for preventing the magnet pieces from jumping out. The opening angle between the input shaft and the output shaft is the sum of the inclination angle of the magnetic surface of the first magnetic bevel gear and the inclination angle of the magnetic surface of the second magnetic bevel gear. The magnetic bevel gear according to any one of claims 1 to 12, characterized in that: 2. The magnetic force that attracts the magnetic surfaces is obtained by using an isotropic rare earth bonded magnet, an anisotropic rare earth sintered magnet, or a magnet having performance equivalent to these. 14. A magnetic bevel gear according to any one of items 1 to 13. The magnetic bevel gear according to any one of claims 1 to 14, wherein the magnetic surface is plated with antirust or painted.

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