JPH0518285U - Magnetic torque cutter - Google Patents

Abstract

(57) [Summary] (Modified) [Constitution] Two cylindrical magnetic materials that rotate coaxially are divided into a plurality of parts on the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the inner cylindrical body. Permanent magnets have N poles-S in the circumferential and axial directions.
The poles are arranged alternately and mounted in parallel with the axis,
Also, a magnetic torque coupler in which respective magnets arranged so as to correspond to the opposing circumferential surfaces are configured to have mutually opposite magnetic poles. [Effect] According to the magnetic torque coupler of the present invention, the transmitted-side cylinder is highly suppressed from being shaken in the axial direction and the rotational direction under any rotation or movement condition of the power-transmission-side cylinder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic torque coupler including a combination of a power transmission side magnet and a transmission side magnet, and in particular, the rotation of the transmission side rotating body is highly controlled, and the rotational and axial deviations are The present invention relates to a magnetic torque coupler which is remarkably suppressed and is highly desirable for practical use.

[0002]

[Prior Art]

 For example, a conventional magnetic torque coupler used for a chemical pump or the like is mounted on both opposite surfaces of an outer cylindrical body and an inner cylindrical body made of a magnetic material that rotate coaxially so as to be parallel to an axis. It has a structure in which a plurality of elongated permanent magnets are mounted in a facing manner. Such a magnetic torque coupler can, for example, rotate the outer transmission-side cylinder to give a rotational motion to the inner transmission-side cylinder in a non-contact manner.

However, the inner transmitted-side cylindrical body usually reciprocates relatively large in the axial direction during the rotational movement, and depending on the load or the rotational speed, for example, the length of a permanent magnet. Inevitable phenomena such as axial swaying of nearly half of the length and step out were inevitable. Such a shaking phenomenon of the cylindrical body is extremely dangerous depending on the operation of the rotating member on the transmitted side or the transmission target thereof.

In order to remedy such a drawback, an outer cylinder made of a plurality of permanent magnets scattered on the inner peripheral surface of a circular tube made of a non-magnetic material is used as a primary member, and a circle made of a non-magnetic material is used. A magnetic coupling has been proposed in which a secondary member of a core made of a plurality of permanent magnets scattered on the outer peripheral surface of a column is coaxially opposed to each other in a non-contact state (Japanese Patent Laid-Open No. 58-72764). News).

The coupling according to this proposal is used, for example, to detect the thrust and torque of a self-propelled dynamometer for testing a model ship of a ship, and the above-mentioned drawbacks are improved to some extent, but both facing surfaces are It is characteristic that a ferromagnetic material (permanent magnet) portion and a weak (non) magnetic material (synthetic resin) portion are mixed with each other. With such a configuration, a large thrust resistance that can be detected by the self-propelled dynamometer for model ship test. And that torque resistance characteristics can be obtained.

However, in this magnetic coupling, it is an indispensable technical matter that the outer cylinder for the primary member to which a plurality of permanent magnets are attached and the inner cylinder for the secondary member are made of a non-magnetic material. In addition, the outer cylinder has holes at equal intervals in the axial direction and the circumferential direction on the peripheral wall of the synthetic resin circular tube as a non-magnetic material, and the holes have approximately the same height as the wall thickness. Small permanent magnets are embedded and fixed to mix ferromagnetic parts and weak (non) magnetic parts.Synthetic resin cylinders also have small permanent magnets embedded and fixed at corresponding positions on the outer periphery of the cylinders to form a mixed state. It is made up of. However, this structure is relatively unsatisfactory as a coupler, which can obtain a relatively small suction force, and is insufficient as a power source for a chemical pump or the like.

[0007]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to control the rotation of the transmission-side cylinder in a magnetic torque coupler that is formed by coaxially combining the rotation-power-transmission-side cylinder and the rotation-power-transmission-side cylinder. In particular, it is an object of the present invention to provide an industrially useful magnetic torque coupler excellent in mutual attraction force, which highly suppresses axial displacement (fluctuation) of the cylinder on the transmitted side during its rotational movement.

[0008]

[Means for solving problems]

 The present inventors have conducted many trials and researches on a magnetic torque coupler that can achieve the above object, and as a result, developed a practically highly desirable magnetic torque coupler that can effectively achieve those technical problems. did.

That is, according to the present invention, in a magnetic torque coupler that transmits the power of one to the other by utilizing the attraction force and repulsive force of the permanent magnet and the permanent magnet, two cylindrical magnetic materials that rotate coaxially are used. On the inner surface of the outer cylinder and the outer surface of the inner cylinder, a plurality of divided permanent magnets are arranged alternately in the circumferential direction and in the axial direction, and the N pole and S pole are arranged alternately and parallel to the axis. The magnetic torque coupler is characterized in that the magnets are mounted so as to correspond to each other, and the respective magnets arranged corresponding to the opposing circumferential surfaces have mutually opposite magnetic poles.

In the magnetic torque coupler of the present invention, the two opposed magnetic surfaces of the two cylindrical magnetic materials, which are freely rotated coaxially and freely movable in the axial direction, are correspondingly arranged. Moreover, the characteristic feature is that the permanent magnets that are mounted so as to be parallel to the respective axes are divided into a plurality of divided permanent magnets (hereinafter abbreviated as small magnets).

Therefore, the small magnets in each row mounted parallel to the axis are usually bonded and arranged on the surface of the cylindrical body using an adhesive so that the N poles and the S poles alternate. .. Further, even between the rows parallel to the axis, for example, adjacent small magnets arranged in the circumferential direction at the edge of the cylindrical body are arranged so that the N poles and the S poles are alternately alternately arranged. The array is installed. It will be readily understood that in such a structure, an alternating arrangement of small magnets is mandatory, and thus the number of rows of small magnets arranged circumferentially in the axis parallel to the axis is even.

Further, in the present invention, it is important that all the small magnets mounted on the respective facing surfaces of the outer cylindrical body and the inner cylindrical body that are coaxially assembled are matched with each other, and It is important that the corresponding surfaces of the small magnets that correspond to each other have opposite magnetic poles.

The rows of the split small magnets arranged in parallel to the axis may be arranged in a grid pattern on the entire peripheral surface, or may be sequentially shifted by a predetermined gap between adjacent rows, for example, It is also possible to give an axial shift of one third pitch or half pitch. When the rows of small permanent magnets arranged in parallel with the axis in this way are arranged with a certain axial displacement in order for each adjacent row, the arrangement will cause The blur can be further reduced.

In addition, when used in vacuum, without using an adhesive agent for the small magnets, a spacer made of a non-magnetic material, for example, a spacer made of aluminum is used to form a gap between the small magnets. The small magnet can be easily and surely attached to the predetermined position by making sure. Furthermore, it is practically practical to pack the outer side of the small magnet group mounted on the outer surface of the inner cylindrical body with a relatively thin non-magnetic material and tightly integrate it with a cylindrical tight cover. One layer is preferred.

The permanent magnet used in the permanent magnet structure of the present invention is not particularly limited in the material, but in practice, rare earth / cobalt magnets and rare earth / iron / boron magnets are preferable. In addition, sintered ferrite magnets, cast alnico magnets and their plastic magnets are advantageously used.

[0016]

【Example】

 Next, the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a schematic plan view in the axial direction of an example of a magnetic torque coupler according to the permanent magnet structure of the present invention, and FIG. 2 is a partial sectional view taken along the line AA. 3 and 4 are schematic development views of a magnetic material cylinder showing an example of different arrangement of small magnets mounted on the magnetic torque coupler according to the present invention.

In FIGS. 1 and 2, small magnets 2, 2, ... Are arranged in a row parallel to the axis on the inner peripheral surface of the cylindrical magnetic material (usually iron) 1 on the outer side of the rotational power transmission side. In addition, they are alternately arranged on the opposite magnetic poles. In the figure, twelve such rows are formed on the circumferential surface of the cylindrical body parallel to the axis, and adjacent small magnets in the circumferential direction of each row are also arranged in order so as to have mutually opposite magnetic poles. It

On the other hand, small magnets 4, 4, ... Corresponding to the small magnets 2, 2, ... Adhere to the outer surface of the inner cylindrical magnetic material 3 on the power transmission side in a similar arrangement state. It is arranged. These small magnets 4, 4 ... Are fitted into the through holes formed in the spacer 5 made of aluminum, which is a non-magnetic material, so as to be fitted into the cylindrical body 3 securely and easily at predetermined positions. Mounted on the surface. Further, a thin cover member 6 made of aluminum, which is a non-magnetic material, firmly fixes the outer surfaces of the small magnets 4, 4, ... Mounted on the surface of the cylindrical body 3 together with the spacer 5. It is packed so as to be wound around the rotor and formed into a more stable rotating body on the power transmission side.

It is important that the small magnets 2, 2 ... Of the outer cylindrical body and the small magnets 4, 4 ,. In addition, the surfaces of the corresponding small magnets have opposite magnetic poles, and all counter magnets are arranged to attract each other by mutual attraction.

FIG. 2 is a partial view of a sectional view including the shaft of the magnetic torque coupler of FIG. 1, showing the small magnets 2, 2 ... On the surface of the cylindrical magnetic material 1 and the cylindrical magnetic material 3. Although not shown in the figure, the corresponding magnets are assembled so as to form anti-magnetic poles, although they are arranged and mounted in a corresponding manner to the small magnets 4, 4, ...

3 and 4 are development views of the cylindrical body showing the different arrangement states of the small magnets, in which the small magnets are arranged in a grid pattern in the axial direction and the circumferential direction of the cylindrical body. In the case (Fig. 3) and in the case where the adjacent columns are sequentially provided with a constant and slight deviation in the axial direction (Fig. 4), the magnetic pole letters N and S are described on each small magnet in the figure. Then, the polarity of the surface of each magnet is displayed, and the state is shown in which small magnets connected vertically and horizontally are alternately arranged in the north pole and the south pole both in the axial direction and in the circumferential direction. There is.

[0022]

[Effect of the device]

 According to the magnetic torque coupler of the present invention, the transmitted side cylinder, which is rotationally moved or moved by the rotation or movement of the power transmission side cylinder, can be operated in the axial direction and the rotational direction under any rotating or moving conditions. Shake is highly suppressed. Therefore, the rotating body on the power transmitting side can be moved in the axial direction, and the rotating body on the transmitted side can be moved substantially freely in the desired axial direction. Furthermore, the rotation and the axial movement can be used simultaneously. As a possible mechanically powerful power source, wide application in various technical fields can be expected. The structure of the present proposal is, for example, a chemical pump, power transmission of an autoclave, a single crystal pulling mechanism such as a metal compound, a rodless linear drive cylinder, an intermittent rotation and axial movement of a screw. It can be suitably used for a back flow prevention fixed feed pump or a screw-in line injection molding machine.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an example of a magnetic torque coupler according to the structure of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic development view showing an example of an arrangement state of small magnets mounted on a cylindrical magnetic material of a structure according to the present invention.

FIG. 4 is a schematic development view of small magnets mounted on a cylindrical magnetic material of a structure according to the present invention in an arrangement state different from that of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer cylindrical magnetic material 2, 4 ... Permanent small magnet 3 ... Inner cylindrical magnetic material 5 ... Spacer 6 ... Cover member

Claims (4)

[Scope of utility model registration request] 1. In a magnetic torque coupler for transmitting the power of one to the other by utilizing the attraction force and the repulsive force of the permanent magnet and the permanent magnet, an outer cylindrical body of two cylindrical magnetic materials rotating coaxially. On the inner peripheral surface of and the outer peripheral surface of the inner cylindrical body,
A permanent magnet divided into a plurality is divided into N in the circumferential direction and the axial direction.
It is characterized in that the poles-S poles are alternately arranged and mounted in parallel to the shaft, and that the magnets arranged corresponding to the opposing circumferential surfaces have mutually opposite magnetic poles. Magnetic torque coupler. 2. A plurality of permanent magnet groups mounted on the outer surface of the inner cylindrical body are tightly packed on the outer side thereof with a thin plate of a relatively thin non-magnetic material to be firmly integrated. 1. The magnetic torque coupler according to 1. 3. The magnetic torque coupler according to claim 1, wherein rows of the split permanent magnets arranged in parallel to the axis are sequentially arranged for each adjacent row with a predetermined offset in the axial direction. -. 4. The magnetic torque coupler according to claim 1, wherein the permanent magnet is selected from rare earth / cobalt magnets and rare earth / iron / boron magnets.