JP6902755B2 - Magnet structure - Google Patents

Description

The present invention relates to a magnet structure that can be used in a power transmission device.

A magnetic power transmission device that transmits power using magnetic force has been put into practical use by taking advantage of the fact that the power transmission portion is non-contact. Two rotating bodies in which a plurality of magnets are arranged in a disk shape so that the magnetic poles are alternately opposed to each other in a non-contact manner, or a rotating body in which a plurality of magnets are arranged in a disk shape so that the magnetic poles are alternately arranged. There are various forms such as a disk-shaped soft magnetic material having protrusions facing each other in a non-contact manner (see, for example, Patent Documents 1, 2 or 3).

Japanese Unexamined Patent Publication No. 2005-180522 Japanese Unexamined Patent Publication No. 2008-133870 Japanese Unexamined Patent Publication No. 2012-197805

In such a magnetic power transmission device, in order to transmit a large power (torque) exceeding 100 Nm, the radius of the opposing rotating bodies is increased to increase the facing area or the facing interval is reduced. It is necessary to increase the magnetic action. However, in that case, since the suction force between the opposing rotating bodies also becomes large, there is a problem that the rotating bodies described in Patent Documents 1 to 3 may not be able to withstand the large suction force and may be destroyed. It was.

The present invention has been made with attention to such a problem, and an object of the present invention is to provide a magnet structure having high durability against a large attractive force and capable of transmitting a large power (torque).

In order to achieve the above object, the magnet structure according to the present invention has a plurality of magnet pieces, a holding portion, and a pair of lid portions, and each magnet piece has the same size and shape and has a square pillar portion. And a pair of convex parts integrally, the square pillar part has an isosceles trapezoidal bottom surface and the width of the front surface is larger than the width of the back surface, and each convex portion has the front surface and both sides on each bottom surface of the square pillar portion. Each magnet piece is provided at a distance from the surface, and each magnet piece is arranged so that each front surface is continuous in a ring shape with each side surface aligned, and the holding portion has a configuration for holding the back surface of each magnet piece, and each lid. The portion is characterized in that it has an outer peripheral edge portion that holds the front surface of the convex portion of each magnet piece and an insertion portion that holds the side surface of the convex portion and is fixed to the holding portion.

In the magnet structure according to the present invention, the magnet piece has a unique shape having a square pillar portion and a pair of convex portions, the back surface of the magnet piece is held by a holding portion, and a pair of lid portions is an outer peripheral edge portion. Since it has a structure that holds the front surface of the convex portion of the magnet piece and holds the side surface of the convex portion at the insertion portion, it prevents the magnet piece from popping out radially and prevents the magnet piece from rotating, resulting in a large attractive force. High durability against. As a result, a large amount of power (torque) can be transmitted by reducing the distance from the opposing magnetic material.

In the magnet structure according to the present invention, each magnet piece has an front surface having an N pole and a back surface having an S pole, and a front surface having an S pole and a back surface having an N pole, and the front surface having an N pole. It is preferable that the magnet and the magnet having an S pole on the front surface are alternately arranged so that the front surfaces are continuous in a ring shape with the side surfaces aligned.

In the magnet structure according to the present invention, the holding portion has a holding main body and a plurality of supporting portions, the holding main body has a holding surface that comes into surface contact with the back surface of each magnet piece, and each supporting portion has the above-mentioned support portion. Each magnet piece has a recess that protrudes perpendicularly to the holding surface and fits with the convex portion of each magnet piece, and each magnet piece is arranged in two stages and is held between each lid and each support in each stage. Is preferable.

In the magnet structure according to the present invention, it is preferable that each magnet piece is made of a bond magnet and has the same dimensional shape in the vertical cross section perpendicular to the front surface and the back surface passing through the convex portion.
In this case, when molding the magnet piece, a molding die can be produced so as to be pulled out in a direction perpendicular to the side surface to facilitate demolding and improve the work efficiency of molding.
It is preferable that each magnet piece is arranged in a Halbach array.

According to the present invention, it is possible to provide a magnet structure having high durability against a large attractive force and capable of transmitting a large power (torque).

It is a perspective view which shows the magnet structure of embodiment of this invention. It is a perspective view which shows the magnet piece which comprises the magnet structure of FIG. It is (A) plan view, (B) AA line sectional view, (C) BB line sectional view, and (D) a partially enlarged plan view which show the holding part constituting the magnet structure of FIG. It is (A) front view, (B) cross-sectional view, (C) vertical center sectional view which shows the support part constituting the magnet structure of FIG. (A) bottom view, (B) AA line sectional view, (C) plan view, and (D) AA line sectional view enlarged sectional view of B portion showing the lid portion constituting the magnet structure of FIG. , (E) is an enlarged cross-sectional view taken along line C of the AA line cross-sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a magnet structure according to an embodiment of the present invention.
As shown in FIG. 1, the magnet structure has a plurality of magnet pieces 10, a holding portion 20, and a pair of lid portions 30.

Each magnet piece 10 is a bond magnet having the same dimensions and shape, and has a quadrangular prism portion 11 and a pair of convex portions 12 integrally as shown in FIG. The quadrangular prism portion 11 has an isosceles trapezoidal bottom surface 11a, and the width of the front surface 11b is larger than the width of the back surface 11c. It is provided. Each magnet piece 10 has the same dimensional shape in the vertical cross section perpendicular to the front surface 11b and the back surface 11c passing through the convex portion 12. Each magnet piece 10 is arranged so that each front surface 11b is continuous in a ring shape with the side surfaces 11d combined.

Each magnet piece 10 has a front surface 11b having an N pole and a back surface 11c having an S pole, and a front surface 11b having an S pole and a back surface 11c having an N pole. The magnet pieces 10 are arranged in a Halbach array, and the front surface 11b has an N pole and the front surface 11b has an S pole, and the front surface 11b is arranged alternately in a ring shape so that the front surface 11b is continuous. .. For example, 48 magnet pieces 10 are used.

The holding portion 20 has a configuration for holding the back surface 11c of each magnet piece 10, and has a holding main body 21 and a plurality of supporting portions 22. As shown in FIG. 3, the holding main body 21 is substantially cylindrical and has an annular groove 23 along the peripheral surface at the center of the peripheral surface. The bottom of the annular groove 23 has a pair of screw holes 24 arranged in the width direction. The holding main body 21 has holding surfaces 25 that come into surface contact with the back surface 11c of each magnet piece 10 on both sides of the annular groove 23 on the peripheral surface. Each holding surface 25 is made of a flat surface. The holding body 21 has a plurality of screw holes 21a and 21b on both end faces. The screw holes 21a and 21b are arranged along the outer circumferences of both end faces of the holding body 21.

As shown in FIG. 4, each support portion 22 integrally has a back plate 26 and a vertical plate 27. The back plate 26 has a screw hole 26a that fits with the annular groove 23 and coincides with the screw hole 24, and is fixed to the holding main body 21 by screws inserted into the screw hole 24 and the screw hole 24. The vertical plate 27 is perpendicular to the back plate 26, is parallel to the annular groove 23, and projects vertically to the holding surface 25. The vertical plate 27 has recesses 28 on both sides that fit with the convex portions 12 of the magnet pieces 10. For example, 48 support portions 22 are used. The magnet pieces 10 are arranged in two stages and are held between the lid portion 30 and the support portion 22 for each stage.

As shown in FIG. 5, each lid portion 30 has a ring shape and has an outer peripheral edge portion 31 and a plurality of insertion portions 32. The outer peripheral edge portion 31 holds the front surface 11b of the convex portion 12 of each magnet piece 10. The insertion portion 32 is provided on the inner surface of the lid portion 30 so as to extend radially along the outer periphery, and holds the side surface of the convex portion 12. Each lid 30 has a plurality of mounting holes 34 along the circular opening 33. Each lid portion 30 is fixed to the holding main body 21 by screws inserted into the mounting hole 34 and the screw hole 21a of the holding main body 21.

The magnet structure can be used in a magnetic power transmission device that transmits power by utilizing magnetic force. The magnet structure has a unique shape in which the magnet piece 10 has a square pillar portion 11 and a pair of convex portions 12, the back surface 11c of the magnet piece 10 is held by the holding portion 20, and the pair of lid portions 30 is outside. Since the peripheral portion 31 holds the front surface 11b of the convex portion 12 of the magnet piece 10 and the insertion portion 32 holds the side surface 11d of the convex portion 12, the magnet piece 10 is prevented from protruding radially and the magnet piece Prevents the 10 from rotating and has high durability against a large suction force. As a result, a large amount of power (torque) can be transmitted by reducing the distance from the opposing magnetic material.

Since each magnet piece 10 has the same dimensional shape in the vertical cross section perpendicular to the front surface 11b and the back surface 11c passing through the convex portion 12, when the magnet piece 10 is molded, it should be pulled out in the direction perpendicular to the side surface 11d. It is possible to manufacture a molding die to facilitate demolding and improve the working efficiency of molding.

10 Magnet piece 11 Square pillar part 12 Convex part 20 Holding part 21 Holding body 22 Support part 23 Circular groove 24 Screw hole 25 Holding surface 26 Back plate 27 Vertical plate 28 Recessed part 30 Lid part 31 Outer peripheral part 32 Insertion part 33 Opening part 34 Mounting hole

Claims (5)

It has a plurality of magnet pieces, a holding part, and a pair of lid parts.
Each magnet piece has the same dimensional shape and integrally has a quadrangular prism and a pair of convex portions. The quadrangular prism has an isosceles trapezoidal bottom surface and a front width larger than the back width. The convex portions are provided on each bottom surface of the quadrangular prism portion at intervals from the front surface and both side surfaces, and the magnet pieces are arranged so that the front surfaces are continuous in a ring shape with the side surfaces combined.
The holding portion has a structure for holding the back surface of each magnet piece.
Each lid portion has an outer peripheral edge portion that holds the front surface of the convex portion of each magnet piece and an insertion portion that holds the side surface of the convex portion, and is fixed to the holding portion.
Characterized magnet structure. Each magnet piece has an N-pole front surface and an S-pole back surface and an S-pole front surface and an N-pole back surface, and the front surface has an N-pole and the front surface has an S-pole structure. The magnet structure according to claim 1, wherein the magnet structures are arranged alternately so that the front surfaces thereof are continuous in a ring shape with the side surfaces combined. The holding portion has a holding body and a plurality of supporting portions.
The holding body has a holding surface that comes into surface contact with the back surface of each magnet piece, and each support portion has a recess that projects perpendicularly to the holding surface and fits with the convex portion of each magnet piece.
That each magnet piece is arranged in two stages and held between each lid and each support in each stage.
The magnet structure according to claim 1 or 2. The magnet structure according to claim 1, 2 or 2, wherein each magnet piece is made of a bond magnet, and the front surface passing through the convex portion and the vertical cross section perpendicular to the back surface have the same dimensional shape. The magnet structure according to any one of claims 1 to 4, wherein each magnet piece is arranged in a Halbach array.

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