JP2557482Y2 - Magnetic coupling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a magnetic coupling.

[0002]

2. Description of the Related Art As a magnetic coupling, a shaft-shaped second coupling member is coaxially inserted into the center of a hollow first coupling member so as to be relatively rotatable, and opposing peripheral surfaces of these two coupling members. Are provided with a plurality of sets of permanent magnets, each of which is opposed to each other, and a rotating force is transmitted by the attraction of the permanent magnets of each set of permanent magnets.

[0003]

However, in the conventional magnetic coupling as described above, it is possible to transmit the rotational force, but it is difficult to transmit the driving force in the axial direction.

[0004] The purpose of this invention is to solve the above problems,
An object of the present invention is to provide a magnetic coupling capable of transmitting a rotational force and an axial driving force.

[0005]

Magnetic coupling according According to a first aspect of the invention, the second coupling member around the shaft-like hollow-shaped first joint member is inserted so coaxially be rotated relative Plural fixed to the opposing peripheral surfaces of these two joint members, respectively.
The permanent magnet device consisting of the permanent magnets
In a magnetic coupling provided in a plurality of sets in the circumferential direction, each set of permanent magnet devices is fixed to an opposing peripheral surface of the first joint member.
One axially extending pole with magnetic poles at both axial ends
An axial permanent magnet is fixed to an opposing peripheral surface of the second joint member.
One that extends in the axial direction and has magnetic poles at both axial ends
And permanent magnets in each set.
The two permanent magnets at the same end in the axial direction
The magnetic poles facing each other and the magnetic poles facing each other are different.
Of permanent magnet units that are polar and are adjacent in the circumferential direction
In the same coupling member as magnetic poles each other adjacent to each other in the circumferential direction of the axial same position the same polarity, each set of permanent magnets instrumentation
Characterized in that permanent magnets are arranged.

The magnetic joint according to the second invention is a hollow joint.
The shaft-shaped second joint member rotates relatively to the center of one joint member
The two joint members are inserted coaxially
Consists of a plurality of permanent magnets fixed
Multiple permanent magnet units are installed in the circumferential direction at the same position in the axial direction.
In the magnetic coupling, each set of permanent magnet devices
Is the axial line at the same circumferential position on the opposing peripheral surface of one joint member.
Peripheral fixed at two locations in the direction and having magnetic poles at both ends in the circumferential direction
Two circumferential permanent magnets extending in the direction
It is fixed to two places in the circumferential direction at the same position in the axial direction of the opposing circumferential surface.
At the same axial position as the two circumferential permanent magnets
Two axially extending poles with magnetic poles at both ends
And two permanent magnets in each set of permanent magnet devices.
The magnetic pole at one axial end of the permanent magnet is
Two permanent magnets in the magnetic poles at both ends in the circumferential direction of the permanent magnet
The magnetic pole at the other axial end of the magnet is
Opposing the magnetic poles at both ends in the direction
The opposite magnetic poles have different polarities and are adjacent to each other in the circumferential direction
Axial direction is the same in the same joint member of the set of permanent magnet units
Magnetic poles adjacent to each other in the circumferential direction of the position have the same polarity
The permanent magnets of each set of permanent magnet units are
It is characterized by the following.

[0007]

In the first invention, each set of permanent magnet devices is
The first joint member is fixed to the opposing peripheral surface and has magnetic
One axially extending permanent magnet with poles
And both ends in the axial direction fixed to the opposing peripheral surface of the second joint member.
One axial permanent magnet with magnetic poles extending in the axial direction
Made of stone, and in each set of permanent magnet devices, both joints
Poles at the same end in the axial direction of the permanent magnet
And the opposing magnetic poles have different polarities
So that the permanent magnets of each set of permanent magnet devices are arranged
Therefore, in each permanent magnet device, two permanent magnet shafts
Between magnetic poles of opposite polarity facing each other at both ends in the line direction
Each permanent line is shaped with radial lines of magnetic force and extends in the axial direction
Axial magnetic lines of force are formed inside the magnet,
Radial and axial lines between two joint members by force lines
A closed magnetic path extending in the direction is formed. others
Therefore, an axial driving force can be transmitted in addition to the rotational force. Ma
And, as the magnetic poles adjacent to each other in the circumferential direction of the axial same position each other <br/> is in the same joint member of a set of permanent magnet system adjacent to each other in the circumferential direction the same polarity, the permanent magnets of each set of permanent magnet device Are arranged, these magnetic poles of the same polarity repel each other, and no leakage of magnetic flux occurs between the permanent magnet devices adjacent in the circumferential direction in each joint member. For this reason,
A completely closed magnetic path is formed in each set of the permanent magnet devices, and the transmission capability of the rotational force and the axial driving force between the joint members is increased.

In a second aspect , each set of permanent magnet devices
Is the axial line at the same circumferential position on the opposing peripheral surface of one joint member.
Peripheral fixed at two locations in the direction and having magnetic poles at both ends in the circumferential direction
Two circumferential permanent magnets extending in the direction
It is fixed to two places in the circumferential direction at the same position in the axial direction of the opposing circumferential surface.
At the same axial position as the two circumferential permanent magnets
Two axially extending poles with magnetic poles at both ends
And two permanent magnets in each set of permanent magnet devices.
The magnetic pole at one axial end of the permanent magnet is
Two permanent magnets in the magnetic poles at both ends in the circumferential direction of the permanent magnet
The magnetic pole at the other axial end of the magnet is
Opposing the magnetic poles at both ends in the direction
Each pair of permanent magnets is set so that the opposite magnetic poles have different polarities.
Since the permanent magnet of the device is arranged, each permanent magnet device
At the two ends of the two permanent magnets in the axial direction
Poles and two circumferential permanent magnets
Lines of magnetic force in the radial direction are between the magnetic poles of opposite polarity at both ends in the circumferential direction.
Inside each axial permanent magnet formed and extending in the axial direction
The magnetic field lines in the axial direction are formed in the
Circumferential magnetic lines of force are formed inside each
Between the two joint members due to these lines of magnetic force.
Closure that extends in the circumferential direction as well as in the axial and axial directions
A magnetic path is formed. For this reason, in addition to the rotational force,
Can be transmitted, and the closed magnetic path expands in the circumferential direction.
Transmission of rotational force and axial driving force
The power is even greater. In addition, pairs of pairs adjacent in the circumferential direction
At the same axial position in the same joint member
Each pair of magnetic poles that are adjacent in the circumferential direction have the same polarity.
Because the permanent magnet of the permanent magnet device of
Magnetic poles of the same polarity repel each other, and in each joint member
Leakage of magnetic flux between permanent magnet units adjacent in the circumferential direction
Never. For this reason, each set of permanent magnet devices
A completely closed magnetic path is formed, and the rotational force between each joint member is
And the transmission capability of the driving force in the axial direction is increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment.
In the description of the first embodiment, the upper and lower sides of the drawing are referred to as the upper and lower sides, and the rotation direction refers to the direction viewed from above. Regarding the rotation direction, a clockwise direction is a rightward direction, and a counterclockwise direction is a leftward direction.

The magnetic joint is a thick cylindrical first joint member.
(1) and a second cylindrical shaft inserted coaxially at its center.
And a joint member (2). Two joint members (1) (2)
Are rotatably supported by a bearing (not shown) such as a magnetic bearing so as to be rotatable about a common axis.

Permanent magnet devices (3a), (3b), (3c), and (3d) are provided at four locations that equally divide the opposing peripheral surfaces of the two joint members (1) and (2) in the circumferential direction.

Each of the permanent magnet devices (3a) to (3d) is located at the same position in the circumferential direction of the inner peripheral surface of the first joint member (1) in the vertical direction (axial direction).
The upper permanent magnet extending in the direction) is fixed at intervals circumferentially (circumferential direction permanent magnets) (4a) (4b) (4c) (4d) and bottom permanent magnet (circumferential permanent magnets) (5a) ( 5b) (5c) (5d), and a left-sided permanent magnet (axial permanent magnet) extending in the vertical direction and fixed at the same position in the axial direction of the outer peripheral surface of the second joint member (2) at a circumferential interval. 6a) (6b) (6c) (6d) and right side permanent magnet (axial permanent magnet) (7a) (7b) (7c) (7d). Upper and lower permanent magnets (4a) to (4d) (5a) of the first joint member (1)
~ (5d) have magnetic poles at both ends in the left-right direction (circumferential direction) .
The permanent magnets (4a) to (4d) (5) above and below the permanent magnet devices (3a) to (3d)
In a) to (5d), the polarities of the left and right magnetic poles are reversed. Second
The left and right permanent magnets (6a) to (6d) (7a) to (7d) of the joint member (2) have magnetic poles at both upper and lower ends, and each set of permanent magnet devices (3a) to (3d)
Left and right permanent magnets (6a) ~ (6d) ( 7a) ~ (7d) in the upper and lower magnetic poles of
Polarity of is reversed. The upper magnetic poles of the left permanent magnets (6a) to (6d) are the left magnetic poles of the upper permanent magnets (4a) to (4d), and the lower magnetic poles of the left permanent magnets (6a) to (6d) are the lower permanent magnets. (5a)
To the leftmost magnetic pole of the upper permanent magnets (7a) to (7d) and the rightmost magnetic poles of the upper permanent magnets (4a) to (4d) to the rightmost permanent magnets (7a) to (7d). The magnetic pole at the lower end of () is the lower permanent magnet (5a) ~
The magnetic poles at the right end of (5d) face each other, and the two magnetic poles facing each other have opposite polarities. And the first
The arrangement of the magnetic poles of the permanent magnet device (3a) and the third permanent magnet device (3c) symmetrical thereto are the same, and the remaining second permanent magnet device (3b) and the fourth permanent magnet symmetrically located therewith. The arrangement of the magnetic poles of the device (3d) is the same, and the arrangement of the magnetic poles of the permanent magnet devices (3a) to (3d) adjacent to each other in the circumferential direction is reversed. As a result, the permanent magnet of the assembled adjacent to each other in the circumferential direction of the (3a) ~ (3d)
Circumferential direction at the same position in the axial direction of the same joint member (1) (2)
Magnetic poles comrades adjacent to each other in the are at the same polarity. For this reason,
Each permanent magnet device (3a) to (3d) has a joint member
(1) A completely closed magnetic path extending in the radial, axial, and circumferential directions of (2) is formed.

More specifically, first and third
In the permanent magnet devices (3a) and (3c), the left ends of the upper permanent magnets (4a) and (4c) are N poles and the right ends are S poles, and the left ends of the lower permanent magnets (5a) and (5c) are S poles and the right end is N The upper end of the permanent magnets (6a) and (6c) is an S pole and the lower end is an N pole, and the upper end of the right permanent magnets (7a) and (7c) is an N pole and the lower end is an S pole. As shown on the left
The S pole at the upper end of the permanent magnets (6a) (6c) and facing it
Between the N pole at the left end of the upper permanent magnets (4a) and (4c), on the right
The N pole at the upper end of the permanent magnets (7a) (7c) and the upper permanent magnet (4
a) Between the rightmost S pole and (4c), the left permanent magnet (6a) (6
c) and the lower permanent magnet (5
a) Permanent magnet between the leftmost S pole of (5c) and the right side
(7a) The magnetic pole of the S pole at the lower end of (7c) and the lower permanent
Between the N poles at the right end of the magnets (5a) and (5c),
A magnetic field line in the radial direction is formed and extends to the left in the axial direction.
Shaft inside the permanent magnet (6a) (6c) and the right permanent magnet (7a) (7c).
Lines of magnetic force are formed and extend in the circumferential direction
Of the upper permanent magnets (4a) (4c) and the lower permanent magnets (5a) (5c)
Magnetic field lines in the circumferential direction are formed in the
Thus, a closed magnetic path is formed between the two joint members (1) and (2), which extends in the radial, axial, and circumferential directions.

In the second and fourth permanent magnet devices (3b) and (3d), on the contrary, the left end of the upper permanent magnets (4b) and (4d) is the south pole, the right end is the north pole, and the lower permanent magnet (5b) ( The left end of 5d) is N pole and the right end is S
Pole, the upper end of the left permanent magnet (6b) (6d) is the north pole and the lower end is the south pole,
The upper end of the right permanent magnet (7b) (7d) has become a lower end N pole at the S pole, likewise, two joint members (1) radially spreads in the axial direction and the circumferential direction between the (2) Is formed.

The first joint member (1) has the same axial direction.
The rightmost magnetic pole of the upper permanent magnet (4a) of the first permanent magnet device (3a) and the leftmost magnetic pole of the upper permanent magnet (4b) of the second permanent magnet device (3b) which are adjacent to each other in the circumferential direction have the same polarity. S pole. The magnetic pole at the right end of the upper permanent magnet (4c) of the third permanent magnet device (3c), the magnetic pole at the left end of the upper permanent magnet (4d) of the fourth permanent magnet device (3d), and below the second permanent magnet device (3b). The rightmost magnetic pole of the side permanent magnet (5b), the leftmost magnetic pole of the lower permanent magnet (5c) of the third permanent magnet device (3c), and the lower permanent magnet (5d) of the fourth permanent magnet device (3d)
And the lower permanent magnet (5) of the first permanent magnet device (3a).
Similarly, the leftmost magnetic pole in a) is an S pole having the same polarity. Conversely, the right end magnetic pole of the upper permanent magnet (4b) of the second permanent magnet device (3b) and the upper permanent magnet (3c) of the third permanent magnet device (3c) adjacent to each other in the circumferential direction at the same position in the axial direction. The magnetic pole at the left end of 4c) is an N pole of the same polarity. 4th permanent magnet device (3d)
The rightmost magnetic pole of the upper permanent magnet (4d) and the first permanent magnet device (3
a) the leftmost magnetic pole of the upper permanent magnet (4a), the first permanent magnet device
(3a) the rightmost magnetic pole of the lower permanent magnet (5a), the leftmost magnetic pole of the lower permanent magnet (5b) of the second permanent magnet device (3b), and the lower permanent magnet of the third permanent magnet device (3c) Similarly, the magnetic pole at the right end of (5c) and the magnetic pole at the left end of the lower permanent magnet (5d) of the fourth permanent magnet device (3d) are also N poles of the same polarity. In the second joint member (2), the magnetic pole at the upper end of the right side permanent magnet (7a) of the first permanent magnet device (3a) adjacent in the circumferential direction at the same position in the axial direction and the second permanent magnet device (3b) The magnetic pole at the upper end of the left permanent magnet (6b) is an N pole of the same polarity. Third permanent magnet device
The magnetic pole at the upper end of the right permanent magnet (7c) of (3c), the magnetic pole at the upper end of the left permanent magnet (6d) of the fourth permanent magnet device (3d), and the right permanent magnet (7b) of the second permanent magnet device (3b). The magnetic pole at the lower end of the third permanent magnet device (3c), the magnetic pole at the lower end of the left permanent magnet (6c), the fourth permanent magnet device (3d), the magnetic pole at the lower end of the right permanent magnet (7d), and the first permanent magnet device. The magnetic poles at the lower end of the left permanent magnet (6a) in (3a) are also N poles of the same polarity. Conversely, same axial direction
The magnetic pole at the upper end of the right permanent magnet (7b) of the second permanent magnet device (3b) adjacent to the circumferential direction of the position and the magnetic pole at the upper end of the left permanent magnet (6c) of the third permanent magnet device (3c) have the same polarity. S pole. The magnetic pole at the upper end of the right permanent magnet (7d) of the fourth permanent magnet device (3d), the magnetic pole at the upper end of the left permanent magnet (6a) of the first permanent magnet device (3a), and the right side of the first permanent magnet device (3a). The magnetic pole at the lower end of the permanent magnet (7a), the magnetic pole at the lower end of the left permanent magnet (6b) of the second permanent magnet device (3b), and the right permanent magnet (7c) of the third permanent magnet device (3c)
And the left permanent magnet (6) of the fourth permanent magnet device (3d).
The magnetic poles at the lower end of d) are also S poles of the same polarity. Accordingly, in the same joint member (1) (2), the circumferential direction
The same in the axial direction of the permanent magnet units (3a) to (3d) adjacent to
Magnetic poles of the same polarity adjacent to each other in the circumferential direction of the position repel each other, and no leakage of magnetic flux occurs between the permanent magnet devices (3a) to (3d) adjacent in the circumferential direction . Therefore, a completely closed magnetic path is formed in each set of the permanent magnet devices (3a) to (3d).

As described above, the four permanent magnet devices (3a) to
Since a closed magnetic path is formed in (3d), two joint members
(1) A suction force acts on (2). And, since this magnetic path has a radial direction, an axial direction and a circumferential direction of the joint members (1) and (2), the rotational force and the axial direction between the two joint members (1) and (2) are increased. Is transmitted. Further, since the magnetic path formed in each of the permanent magnet devices (3a) to (3d) is completely closed, the transmission of the rotational force and the driving force in the axial direction between the joint members (1) and (2) is performed. High ability.

For example, assuming that the first joint member (1) is on the driving side and the second joint member (2) is on the driven side, the first joint member (1) is rotated by an appropriate means, so that the second joint member (1) is rotated. (2)
Is also rotated to move the first joint member (1) in the axial direction, so that the second joint member (2) also moves in the axial direction.

Conversely, when the second joint member (2) is on the drive side and the first joint member (1) is on the driven side, the first joint member (2) is rotated by appropriate means to thereby provide the first joint member (2). The member (1) also rotates, and the first joint member (1) also moves in the axial direction by moving the second joint member (2) in the axial direction.

FIGS. 4 and 5 show a second embodiment. In the description of the second embodiment, the upper and lower parts of FIG. 4 are referred to as the upper and lower parts, and the rotation direction refers to the direction as viewed from above as shown in FIG. Regarding the rotation direction, a clockwise direction is a rightward direction, and a counterclockwise direction is a leftward direction.

As in the case of the first embodiment, the magnetic joint comprises a thick cylindrical first joint member (10) and a cylindrical shaft-like first coaxially rotatably inserted in the center thereof. 2 joint members
(11).

Permanent magnet devices (12a) (12b) (12c) are provided at four locations which equally divide the opposing peripheral surfaces of the two joint members (10) (11) in the circumferential direction.
(12d) is provided.

Each of the permanent magnet devices (12a) to (12d) includes an outer permanent magnet (axial permanent magnet) extending vertically extending and fixed to the inner peripheral surface of the first joint member (10). (13c) (13d),
And a vertically extending inner permanent magnet (axial permanent magnet) fixed to the outer peripheral surface of the second joint member (11 ) (14a) (14b)
(14c) (14d). These permanent magnets (13a) to (13d)
(14a) to (14d) have magnetic poles at both upper and lower ends, and outer permanent magnets
The upper and lower polarities of (13a) to (13d) and the inner permanent magnets (14a) to (14d) are reversed. For example, the outer permanent magnet (13
In (a) to (13d), the upper end is an N pole and the lower end is an S pole. In the inner permanent magnets (14a) to (14d), the upper end is an S pole and the lower end is an N pole. The magnetic poles of opposite polarities face each other at the upper and lower ends of the outer permanent magnets (13a) to (13d) and the inner permanent magnets (14a) to (14d). In addition, outer permanent magnets (13a) to (1
3d) Since the upper and lower polarities are all the same, the first joint member
In (10), a permanent magnet device adjacent to each other in the circumferential direction (12a) ~
(12d) Same axial direction of upper end (N pole) and lower end (S pole)
Pole comrades adjacent to each other in the circumferential direction of the first position is the same polarity. Similarly, since the upper and lower polarities of the inner permanent magnets (14a) to (14d) are all the same, in the second joint member (11), the circumferentially adjacent permanent magnet devices (12a) to (12a) upper (S pole) and a lower end (N pole comrades adjacent to each other in the circumferential direction of the axial same position of the pole) of 12d) is the same polarity.

Each of the permanent magnet units (12a) to (12d) has two permanent magnets (13a) to (13d) (14a) as shown by a chain line in FIG.
~ (14d), opposite-polarity magnets
Radial lines of magnetic force are formed between the poles and extend in the axial direction.
(13a)-(13d) (14a)-(14d)
Direction lines of magnetic force are formed.
A closed magnetic path extending in the radial and axial directions is formed between the joint members (10) and (11) of the two joint members (10).
A suction force acts on (11). And this magnetic path is a joint member
(10) Since it expands in the radial direction and the axial direction of (11), the rotational force and the driving force in the axial direction are transmitted between the two joint members (10) and (11). Also in this case,
Around the same joint member (10) (11) at the same position in the axial direction
Because magnetic poles each other adjacent to the direction and has a same polarity, the axis
Same polarity magnetic poles comrades adjacent to each other in the circumferential direction of the direction the same position mutually repulsive, permanent magnet devices adjacent to each other in the circumferential direction (12a) ~ (12
There is no leakage of magnetic flux during d). For this reason, a completely closed magnetic path is formed in each set of the permanent magnet devices (12a) to (12d), and the rotational force and the driving force in the axial direction between the joint members (10) and (11) are transmitted. Is high.

The arrangement of the permanent magnets of the permanent magnet device is not limited to that of the above embodiment, but can be changed as appropriate. For example, the arrangement of the permanent magnets on the first joint member side and the permanent magnets on the second joint member side may be opposite to those in the above embodiment.

[0026]

According to the magnetic coupling of the present invention, as described above, it is possible to transmit not only the rotational force but also the axial driving force, and the transmission capability of the rotational force and the axial driving force is extremely increased. be able to.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a magnetic coupling showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing an arrangement of a permanent magnet of a first joint member of the magnetic joint of FIG. 1;

FIG. 3 is a perspective view showing an arrangement of permanent magnets of a first permanent magnet device of the magnetic coupling of FIG. 1;

FIG. 4 is a longitudinal sectional view of a magnetic coupling according to a second embodiment of the present invention.

FIG. 5 is a horizontal sectional view of the magnetic coupling shown in FIG. 4;

[Explanation of symbols]

(1) First joint member (2) Second joint member (3a) (3b) (3c) (3d) Permanent magnet device (4a) (4b) (4c) (4d) Upper permanent magnet (peripheral permanent magnet)
( Stone) (5a) (5b) (5c) (5d) Lower permanent magnet (peripheral permanent magnet)
( Stone) (6a) (6b) (6c) (6d) Left permanent magnet (axial permanent
( Magnet) (7a) (7b) (7c) (7d) Right side permanent magnet (axial permanent
Magnets) (10) first coupling member (11) second coupling member (12a) (12b) (12c) (12d) the permanent magnet system (13a) (13b) (13c) (13d) outer permanent magnets (axial permanent
( Magnet) (14a) (14b) (14c) (14d) Inner permanent magnet (axial permanent
magnet)

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuji Sugimoto 5-8-1, Yotsuya, Fuchu-shi, Tokyo Nidec Anelva Co., Ltd. (56) References JP-A-2-246768 (JP, A) Japanese Utility Model 2 17985 (JP, U) Jikken 46-2297 (JP, Y1)

Claims (2)

(57) [Scope of request for utility model registration] An axial second center member is provided at a center of a hollow first joint member.
The joint members are coaxially inserted so as to be relatively rotatable, and are respectively fixed to opposing peripheral surfaces of the two joint members.
Permanent magnet device consisting of multiple permanent magnets
In a plurality of magnetic couplings provided at one position in the circumferential direction, each set of permanent magnet devices is fixed to the opposing peripheral surface of the first coupling member.
Axially extending 1 with magnetic poles at both axial ends
And the two permanent magnets in the axial direction are fixed to the opposing peripheral surface of the second joint member.
Extends in the axial direction with magnetic poles at both axial ends
Consisting of one axial permanent magnet, each set of permanent magnet
At the same axial end of the two permanent magnets
Magnetic poles oppose each other,
There becomes opposite polarity, and as the magnetic poles each other adjacent <br/> in the circumferential direction of the axial same position in the same coupling member of the set of permanent magnet system adjacent to each other in the circumferential direction is the same polarity, each set of permanent magnetic
A magnetic coupling, wherein a permanent magnet of a stone device is arranged. 2. A shaft-like second joint member is provided at the center of a hollow first joint member.
Coaxially inserted so that the joint members can rotate relatively
And fixed to the opposing peripheral surfaces of these two joint members, respectively.
Permanent magnet device consisting of multiple permanent magnets
Multiple sets of magnetic joints provided in one circumferential direction
Therefore , each set of permanent magnet devices is
Fixed at two locations in the axial direction at the same position in the direction, and both ends in the circumferential direction
Circumferentially extending permanent magnets with magnetic poles
And the circumference at the same position in the axial direction of the opposing peripheral surface of the other joint member.
Two permanent magnets fixed in two directions in the direction and the axis direction
With magnetic poles at both axial ends at the same position in the axial direction.
And two sets of permanent magnets in the axial direction.
In a stone device, the axial one of two axial permanent magnets
The magnetic poles at the ends are the magnetic poles at both ends in the circumferential direction of one circumferential permanent magnet.
The magnetic poles at the other end in the axial direction of the two permanent magnets in the axial direction
Opposing magnetic poles at both ends in the circumferential direction of one circumferential permanent magnet
And the magnetic poles facing each other have different polarities.
And the same joint of a pair of permanent magnet units adjacent in the circumferential direction
Magnetic poles adjacent in the circumferential direction at the same position in the axial direction in the member
The permanent magnet units of each pair are set so that the comrades have the same polarity.
A magnetic joint , wherein a magnet is arranged .