JP4914756B2 - Magnetic shaft coupling structure - Google Patents

Description

  The present invention relates to a magnetic shaft coupling structure that transmits a rotational force of one rotary shaft to the other rotary shaft by magnetism.

The magnetic shaft coupling structure connects the rotating shafts magnetically. For example, there is a structure in which a rotating shaft of a driving source such as an engine and a rotating shaft of a work machine such as a pump are connected (for example, Patent Document 1). reference.).
Japanese Patent Laid-Open No. 9-72449 (page 4, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 11 is an explanatory diagram of the prior art, and a driving force transmission device 201 to a conventional fluid control valve is configured to have primary and secondary magnetic joints 203 of the same shape that are arranged facing the inside and outside of a partition wall 202. 204, the primary side magnetic coupling 203 and the secondary side magnetic coupling 204 are attracted to each other by the south pole of the permanent magnet 206 going to the north pole of the permanent magnet 205, and the primary side magnetic coupling 203 is driven by the electric motor 207. Rotates, the secondary side magnetic coupling 204 also rotates simultaneously.

However, in the driving force transmission device 201 to the fluid control valve of Patent Document 1, the primary side magnetic coupling 203 and the secondary side magnetic coupling 204 are configured such that the south pole of the permanent magnet 206 faces the north pole of the permanent magnet 205. There is a problem that it is not easy to attract each other and separate the secondary side magnetic coupling (output shaft connecting magnetic part) 204 from the primary side magnetic coupling (input shaft connecting magnetic part) 203.
In addition, since a suction force is applied, there is a problem in that an object may be caught during disassembly / assembly.

  The present invention ensures transmission torque, makes it easy to attach and detach the input shaft connecting magnetic part and the output shaft connecting magnetic part, and makes the rotation speed different between the input shaft connecting magnetic part and the output shaft connecting magnetic part, improving the appearance. It is another object of the present invention to provide a magnetic shaft coupling structure having an antirust / dustproof effect.

The invention according to claim 1 is an input shaft connecting magnetic part connected to the rotating shaft of the drive source, and an output shaft connecting magnetic part from which the rotational force is transmitted in a non-contact manner by magnetism from the input shaft connecting magnetic part. , A plurality of magnets are arranged at predetermined intervals so that the magnetism is repulsive in each of the input shaft connecting magnetic portion and the output shaft connecting magnetic portion , It consists of a female joint connected to the rotating shaft and a plurality of magnets provided around the female joint, and the magnet of the input shaft connecting magnetic part is covered with a cup-shaped input cover, and the input cover Is made of resin, has a gap with respect to the magnet of the input shaft connecting magnetic part and the female joint part, is non-contact, and the output shaft connecting magnetic part is connected to a shaft arranged concentrically with the rotating shaft. And a plurality of magnets provided around the male joint. The magnet of the output shaft connecting magnetic part is covered with the output part cover, the output part cover is made of resin, has a gap with respect to the magnet of the output shaft connecting magnetic part and the male joint part, and is non-contacting, It is formed in a convex shape that fits in the input part cover with a desired gap. By removing the output part cover, the output shaft connection magnetic part is removed, and by fitting the output part cover to the input part cover, the input shaft connection magnetic part and the output The shaft connecting magnetic part is combined .

  In the invention according to claim 2, one of the magnets is arranged in the longitudinal direction of the rotating shaft on one inner peripheral surface formed on one of the input shaft connecting magnetic part and the output shaft connecting magnetic part, and The other magnet of the magnets is arranged in the longitudinal direction of the rotating shaft on the other outer peripheral surface formed so as to face the inner peripheral surface.

  In the invention according to claim 3, one of the magnets is disposed on the inner peripheral surface so as to be inclined with respect to the axis of the rotating shaft, and the other magnet is disposed on the outer peripheral surface in parallel with the inclined one magnet. It is provided.

  In the invention according to claim 4, the outer diameter of the other outer peripheral surface is made different from the inner diameter of one inner peripheral surface, and the shaft connected to the other outer peripheral surface is different from the axis connected to the one inner peripheral surface. Is characterized by being eccentric.

In the invention which concerns on Claim 1, the input shaft connection magnetic part connected to the rotating shaft of a drive source, and the output shaft connection magnetic part to which a rotational force is transmitted by this input shaft connection magnetic part by magnetism without contact, The input shaft connecting magnetic unit and the output shaft connecting magnetic unit are provided with an input unit cover and an output unit cover of the output shaft connecting magnetic unit. Since they are combined, there is an advantage that no friction powder is generated and seizure does not occur.
In addition, a plurality of magnets are arranged at predetermined intervals so that magnetism is repulsive (repulsive force) in each of the input shaft connecting magnetic unit and the output shaft connecting magnetic unit, and the output unit cover is fitted to the input unit cover. Since the input shaft connecting magnetic portion and the output shaft connecting magnetic portion are combined , when the input shaft connecting magnetic portion rotates, the output shaft connecting magnetic portion is pushed and rotated by the repulsive force. Therefore, there is an advantage that transmission torque can be secured.

In addition, a plurality of magnets are arranged at predetermined intervals so that magnetism is repulsive in each of the input shaft connecting magnetic unit and the output shaft connecting magnetic unit, and the output unit cover is fitted to the input unit cover so that the input shaft connecting magnetism The output shaft connection magnetic part can be removed from the input shaft connection magnetic part without feeling excessive attraction between the magnets and the output shaft connection magnetic part. The magnetic part and the output shaft connecting magnetic part can be easily attached and detached.
Furthermore, in the invention according to claim 1, since the resin input portion cover that covers the input shaft connecting magnetic portion, and the resin output portion cover that covers the output shaft connecting magnetic portion, There are advantages that the appearance can be improved and the rust and dust prevention effects can be exhibited.

  In the invention which concerns on Claim 2, one magnet is arrange | positioned in the longitudinal direction of a rotating shaft in one inner peripheral surface formed in either one of an input shaft connection magnetic part and an output shaft connection magnetic part, and the other is used. The other of the magnets is arranged in the longitudinal direction of the rotation shaft on the other outer peripheral surface formed so as to face the inner peripheral surface. For example, a magnet is attached to the inner peripheral surface of the input shaft connecting magnetic part, and a magnet is attached to the outer peripheral surface of the output shaft connecting magnetic part. As a result, since repulsive force is applied in the inner and outer radial directions, a thrust load is not generated in the bearings supporting the input shaft connecting magnetic part and the output shaft connecting magnetic part, and the durability of the bearing can be improved. .

  The output shaft connection magnetic part can be removed from the input shaft connection magnetic part without feeling excessive attraction between the magnets, and the input shaft connection magnetic part and the output shaft connection magnetic part can be easily attached and detached. Become.

  There is an advantage that the magnet on the inner peripheral surface and the magnet on the outer peripheral surface are elongated in the longitudinal direction of the rotating shaft, the magnet can be enlarged, and a larger transmission torque can be obtained.

The position of the magnet on the inner peripheral surface and the magnet on the outer peripheral surface can be separated radially outward from the rotation axis, and the transmission torque can be increased compared to those arranged at the same radius.
Thereby, in the case of the same transmission torque, the input shaft connection magnetic part and the output shaft connection magnetic part can be made compact.
Furthermore, the magnetic force of the magnet can be reduced, and the manufacturing cost can be reduced.

  In the invention according to claim 3, one of the magnets is disposed on the inner peripheral surface so as to be inclined with respect to the axis of the rotating shaft, and the other magnet is disposed on the outer peripheral surface in parallel with the inclined one magnet. Therefore, when the input shaft connecting magnetic part is rotated in the reverse direction, a repulsive force is applied in the direction of pushing out the output shaft connecting magnetic part. Therefore, there is an advantage that the attachment and detachment of the input shaft connecting magnetic part and the output shaft connecting magnetic part becomes easier.

  Further, in the invention according to claim 3, when the output shaft connecting magnetic part is used in, for example, a work machine, one magnet is used in a state in which the work machine is used, that is, in a use state in which the input shaft connecting magnetic part is rotated forward. There is an advantage that the coupling force of the other magnet can be increased.

  In the invention which concerns on Claim 4, while changing the outer diameter of the other outer peripheral surface with respect to the inner diameter of one inner peripheral surface, it is the axis | shaft connected with the other outer peripheral surface with respect to the axis | shaft connected with one inner peripheral surface. As a result, the transmission torque can be secured and the rotational speed can be varied between the input shaft connecting magnetic part and the output shaft connecting magnetic part.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
1 (a) and 1 (b) are external views of a working device that employs the magnetic shaft coupling structure (first embodiment) of the present invention.
A magnetic shaft coupling structure (first embodiment) 11 connects a driven shaft 14 to a driving shaft 13 that is a rotating shaft of a driving source 12. Further, the axis C2 of the driven shaft 14 is concentric with the axis C1 of the drive shaft 13, and the rotational force is transmitted from the input shaft connection magnetic unit 16 connected to the drive shaft 13 and the input shaft connection magnetic unit 16. The output shaft connecting magnetic unit 17, the input unit cover 21 covering the input shaft connecting magnetic unit 16, and the output unit cover 22 covering the output shaft connecting magnetic unit 17 are employed in the work device 25. .

  The work device 25 is a combination of a work source 27 and a drive source device 26 provided with the drive source 12. Examples of the work device 27 include a hydraulic pump mechanism 28, a compressor, a generator, and a vacuum cleaner. . A hydraulic pump mechanism 28 is selected as the work machine 27.

  The drive source device 26 has a gasoline engine as the drive source 12 and a rotation switching device (not shown) for switching the rotation direction, and a resin engine cover main body 31 covering these in a box-shaped hexahedron. The cup-shaped input portion cover 21 is formed integrally with the reference side surface portion 32 of the engine cover main body 31 facing the input shaft connecting magnetic portion 16, and is connected to the bottom surface portion 33 of the engine cover main body 31. A reference base portion 34 is formed, and a grip portion 36 and a latching mechanism 37 are disposed on the upper surface portion 35 of the engine cover main body 31.

The work machine 27 also has a convex output unit cover 22 formed integrally with the work machine cover 41 together with the resin work machine cover 41.
The outer diameter D1 of the output part cover 22 is slightly smaller than the inner diameter D2 of the input part cover 21. That is, a predetermined clearance fit is obtained.

Here, the hydraulic pump mechanism 28 will be described as an example.
The water pressure pump mechanism 28 drives the water pressure pump 43 to send out the water taken in from the water supply port 44 at a predetermined water pressure and the pressure water from the discharge port 45, and the work machine cover 41 covering the water pressure pump 43 is boxed. The output cover 22 is formed in a cup shape on the first side 51 facing the reference side surface 32 of the engine cover main body 31, and the upper 52 connected to the upper edge of the first side 51 is formed on the first side 51. A latching boss 55 included in the handle 53 and the latching mechanism 37 is disposed.

FIG. 2 is a sectional view of the magnetic shaft coupling structure (first embodiment) of the present invention.
FIG. 3 is a perspective view of the input shaft connecting magnetic part and the output shaft connecting magnetic part provided in the magnetic shaft coupling structure (first embodiment) of the present invention.

The input shaft connecting magnetic part 16 is formed in a cup shape formed concentrically with the input connecting part 57 on the input connecting part 57 connected to the driving shaft (rotating shaft) 13 of the driving source 12. A female joint portion 61 and a plurality of inner peripheral permanent magnets 64 arranged in parallel on the inner peripheral surface 62 of the female joint portion 61 at a predetermined interval (pitch angle θ1). The input unit cover 21 is covered with a gap.
The input portion cover 21 has a gap with respect to the inner peripheral permanent magnet 64 and the female joint portion 61 and is not in contact with the input portion cover 21. The thickness of the input portion cover 21 is t1 (for example, 2 mm). .

The female joint part 61 has an outer cylinder part 65 that forms an inner peripheral surface 62 with a predetermined radius r1, and the length of the outer cylinder part 65 is L1.
The inner peripheral permanent magnet 64 is a permanent magnet, for example, a neodymium magnet, and is arranged with a specific magnetic pole (for example, N pole) facing inward in the radial direction of the inner peripheral surface 62. Further, the length is substantially the same as the length L1.

The output shaft connecting magnetic part 17 is concentric with the output connecting part 66 and the output connecting part 66 connected to the driven shaft 14 of the work machine 27, here the driven shaft of the hydraulic pump 43. The cup-shaped male joint portion 67 formed and a plurality of outer peripheral permanent magnets 71 provided around the outer peripheral surface 68 of the male joint portion 67 at a predetermined interval (pitch angle θ1). 71 is covered with the output unit cover 22.
The output portion cover 22 has a gap with respect to the outer peripheral permanent magnet 71 and the male joint portion 67 and is not in contact with each other, and the thickness of the output portion cover 22 is t2 (for example, 2 mm).

  The male joint portion 67 has an inner cylindrical portion 72 that forms an outer peripheral surface 68 with a predetermined radius r2, and the length of the inner cylindrical portion 72 is L2. The radius r2 is obtained by subtracting t1, t2 and the respective gaps from r1, and forms a radial gap S / 2 with the inner peripheral surface 62 of the female joint portion 61.

  The outer peripheral permanent magnet 71 is a permanent magnet, for example, a neodymium magnet, and is disposed with the same polarity (for example, N pole) as the inner peripheral permanent magnet 64 facing outward in the radial direction of the outer peripheral surface 68. Further, the length is substantially the same as the length L2 and the length of the inner peripheral permanent magnet 64.

Next, the connection between the male joint portion 67 and the female joint portion 61, that is, the combination procedure of the drive source device 26 and the work implement 27 will be described with reference to FIGS.
The work device 25 is placed on the reference base portion 34 of the drive source device 26 with the handle 53 of the work machine 27, the output portion cover 22 is brought close to the input portion cover 21, and the input portion cover 21 (female joint portion 61). The output portion cover 22 (male joint portion 67) is fitted against the repulsive force (repulsive force), and the work implement cover 41 is fixed to the engine cover main body 31 by the latch mechanism 37.

  The repulsive force (repulsive force) is a state in which the phase of the outer peripheral permanent magnet 71 of the male joint portion 67 is farthest from the phase (A-axis direction) of the inner peripheral permanent magnet 64 of the female joint portion 61 (see FIG. 4). In the state), and the maximum in the state in which the phases match.

Next, the operation of the magnetic shaft coupling structure of the present invention (first embodiment) will be described.
FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 2 and a diagram for explaining a mechanism for power transmission and a mechanism for facilitating the removal. The input unit cover 21 and the output unit cover 22 are omitted. 1 to 3 will be used in combination.

  By attaching the output shaft connecting magnetic portion 17 to the input shaft connecting magnetic portion 16 of the magnetic shaft coupling structure (first embodiment) 11, the outer peripheral permanent magnet having the same polarity as the inner peripheral permanent magnet 64 is provided on the inner peripheral permanent magnet 64. When the magnet 71 is opposed, repulsive force (repulsive force) is generated.

  When the output shaft connecting magnetic unit 17 is fitted to the input shaft connecting magnetic unit 16 shown in FIG. 4, it can be attached in a non-contact manner by magnetism in which the same poles are opposed to each other. The concentricity of the driven shaft 14 of the hydraulic pump 43) can be increased, and the assembly of the working device 25 is facilitated.

When removing the working device 25, the latching mechanism 37 is removed as shown by the two-dot chain line in FIG.
In the magnetic shaft coupling structure 11, repulsive force (repulsive force) is generated between the inner peripheral permanent magnet 64 and the outer peripheral permanent magnet 71. The output shaft connecting magnetic part 17 can be pulled out from the input shaft connecting magnetic part 16 without feeling an excessive attractive force between the two.
That is, the input shaft connecting magnetic unit 16 and the output shaft connecting magnetic unit 17 can be easily attached and detached.

  In the magnetic shaft coupling structure 11 shown in FIG. 4, after the output shaft connecting magnetic part 17 of the working device 25 is fitted, the drive source device 26 is started and operated to rotate the input shaft connecting magnetic part 16 (arrow a1). The output shaft connecting magnetic part 17 is pushed in the direction of the arrow a2 by repulsive force in a non-contact state, so that the output shaft connecting magnetic part 17 starts to rotate. Therefore, transmission torque can be ensured.

  In the magnetic shaft coupling structure 11 shown in FIGS. 1 and 2, the input shaft connecting magnetic part 16 is covered with a resin input part cover 21 and the output shaft connecting magnetic part 17 is covered with a resin output part cover 22. The drive source device 26 and the work implement 27 can be easily attached and detached without impairing the power transmission operation.

Further, the appearance is improved by covering the input shaft connecting magnetic part 16 with the resin input part cover 21 and covering the output shaft connecting magnetic part 17 with the resin output part cover 22.
Further, by covering the input shaft connecting magnetic part 16 with the resin input part cover 21 and covering the output shaft connecting magnetic part 17 with the resin output part cover 22, it is possible to exert a rustproof / dustproof effect.

  In addition, when the input shaft connecting magnetic part 16 is covered with the resin input part cover 21, the female joint part 61, which is a rotating body, is not exposed, so that contact with the input shaft connecting magnetic part 16 can be prevented.

Next, another embodiment will be described.
FIG. 5 is a sectional view of the second embodiment and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
6 is a cross-sectional view taken along line 6-6 of FIG.

  The magnetic shaft coupling structure 11B of the second embodiment includes an input shaft connecting magnetic part 16B connected to the drive shaft 13, and an output shaft connecting magnetic part 17B to which a rotational force is transmitted from the input shaft connecting magnetic part 16B. It is characterized by providing.

The input shaft connecting magnetic part 16B includes a female joint part ( input disk ) 81 connected to the rotary shaft (drive shaft) 13 of the drive source 12 and a panel surface permanent magnet 82 arranged on the surface of the input disk 81. A plurality of disk surface permanent magnets 82 are arranged at a pitch angle α.
The surface permanent magnet 82 is a permanent magnet, for example, using a neodymium magnet, and is arranged with a specific magnetic pole (for example, N pole) facing the output shaft connecting magnetic portion 17B. Moreover, it is plate-shaped and formed in a substantially square shape.
The board surface permanent magnet 82 may have a shape other than a substantially square shape.

The output shaft connecting magnetic part 17B is substantially the same as the input shaft connecting magnetic part 16B, and has a male joint part ( output disk ) 85 facing the input disk 81 and a surface permanent magnet 82 arranged on the surface of the output disk 85. And consist of
The surface permanent magnet 82 of the output shaft connecting magnetic part 17B is arranged with the same polarity facing the input shaft connecting magnetic part 16B so as to generate repulsive force with the surface permanent magnet 82 of the input shaft connecting magnetic part 16B.

FIG. 7 is a diagram illustrating a power transmission mechanism according to the second embodiment. This will be described with reference to FIGS.
The magnetic shaft coupling structure 11B of the second embodiment exhibits the same functions and effects as the magnetic shaft coupling structure 11 of the first embodiment.

  The drive source device 26B and the work implement 27B of the working device 25B adopting the magnetic shaft coupling structure 11B are combined, the drive source device 26B is started and operated, and the input shaft connecting magnetic part 16B rotates (in the direction of the arrow b1). When starting, since the output shaft connecting magnetic part 17B is pushed in the direction of the arrow b1 by repulsive force in a non-contact state, the output shaft connecting magnetic part 17B starts to rotate. Therefore, transmission torque can be ensured.

When removing the working device 25B, the latching mechanism 37 is removed as shown by the two-dot chain line in FIG.
In the magnetic shaft coupling structure 11B, a repulsive force (repulsive force) is generated between the surface permanent magnet 82 of the input shaft connecting magnetic portion 16B and the surface permanent magnet 82 of the output shaft connecting magnetic portion 17B. When removed, the output shaft connecting magnetic portion 17B can be separated from the input shaft connecting magnetic portion 16B without feeling an attractive force.
That is, it becomes easy to remove the output shaft connecting magnetic part 17B from the input shaft connecting magnetic part 16B.

  Furthermore, the appearance can be improved, rust and dust prevention effects can be exhibited, and contact with the input shaft connecting magnetic portion 16B can be prevented.

Next, a third embodiment will be described.
FIG. 8 is an explanatory diagram of the third embodiment. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.

  The magnetic shaft coupling structure 11C of the third embodiment includes an input shaft connecting magnetic part 16C connected to the drive shaft 13, and an output shaft connecting magnetic part 17C to which a rotational force is transmitted from the input shaft connecting magnetic part 16C. It is characterized by providing.

The input shaft connecting magnetic portion 16C has a predetermined interval with respect to the axis C1 of the rotating shaft (driving shaft) 13 at a predetermined interval (pitch angle θ1) at an inner peripheral permanent magnet 64C obliquely to the cup-shaped female joint portion 61. It is provided with an angle that is inclined only (inclination angle γ).
That is, the inner peripheral permanent magnet 64 </ b> C only needs to be inclined with respect to the axis C <b> 1 of the rotation shaft (drive shaft) 13.

The output shaft connecting magnetic part 17C has an outer peripheral permanent magnet 71C obliquely attached to the cup-shaped male joint part 67 at a predetermined interval (pitch angle θ1) and a predetermined amount with respect to the axis C1 of the rotary shaft (drive shaft) 13. It is provided with an inclined angle (inclination angle γ). That is, it is arranged in parallel to the inclined inner peripheral permanent magnet 64C.
That is, the outer peripheral permanent magnet 71 </ b> C only needs to be oblique as much as the inner peripheral permanent magnet 64 </ b> C.

  FIGS. 9A to 9C are diagrams illustrating the power transmission mechanism and the detachment mechanism according to the third embodiment. The input shaft connecting magnetic unit 16C and the output shaft connecting magnetic unit 17C are schematically developed on the upper stage, and the side surfaces of the input shaft connecting magnetic unit 16C and the output shaft connecting magnetic unit 17C developed on the upper stage are shown on the lower stage. This will be described with reference to FIG.

In order to assemble the work machine 27 to the drive source device 26 shown in (a), the output shaft connecting magnetic part 17C of the work machine 27 is located in the vicinity position shown by the solid line from the remote position X1 shown by the two-dot chain line. When approaching X2, since the same poles are opposed in advance, a repulsive force is generated between one end 91 side of the inner peripheral permanent magnet 64C and one end 92 side of the outer peripheral permanent magnet 71C. Since the repulsive force becomes a resistance when the output portion cover 22 is fitted to the input portion cover 21, the input portion cover 21 is held at a place where the repulsive force is large (for example, the vicinity position X2).
Subsequently, when the operation unit (not shown) of the drive source device 26 is operated at “low speed” and “forward rotation (direction of arrow b3)”, the input shaft connecting magnetic unit 16C starts to rotate.

  When the input shaft connecting magnetic part 16C shown in (b) starts to rotate, only one end 91 of the inner peripheral permanent magnet 64C and only one end 92 of the outer peripheral permanent magnet 71C are attracted. Further push it into the back (similar to the state of FIG. 2). This completes the assembly of the work machine 27.

  When the outer peripheral permanent magnet 71C is in the state shown in (b) when assembled, the input shaft connecting magnetic portion 16C may be assembled without rotating.

  When the operation unit is operated to start operation, the rotational force is transmitted to the output shaft connecting magnetic unit 17C in a non-contact manner depending on the state of the repulsive force. Therefore, transmission torque can be ensured.

Next, removal of the work machine 27 will be described.
When removing the work machine 27 shown in (c), the operation unit (not shown) is operated at “low speed” and “reverse rotation (in the direction of arrow b4)” so that the input shaft connecting magnetic unit 16C is When it starts to rotate against the repulsive force, the repulsive force is generated obliquely (in the direction of the arrow b6) along the inclined angle and increases. As a result, repulsive force is applied in the direction in which the work implement 27 is separated from the drive source device 26 (in the direction of the arrow b6), so that it is easy to remove the output shaft connection magnetic unit 17C from the input shaft connection magnetic unit 16C.

FIG. 10 is a sectional view of the fourth embodiment and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
The magnetic shaft coupling structure 11 </ b> D of the fourth embodiment includes an output shaft connection magnetic part 17 </ b> D to which a rotational force is transmitted from the input shaft connection magnetic part 16. Further, the axis C2 of the driven shaft 14 is eccentric by the distance E with respect to the axis C1 of the drive shaft 13.

  The output shaft connecting magnetic part 17D is formed with a radius r4 smaller than a predetermined radius r1 of the female joint part 61, and is the same radius as the magnetic shaft coupling structure (first embodiment) 11 between the input shaft connecting magnetic part 16 and the output shaft connecting magnetic part 17D. Eccentricity is formed so as to form a gap S / 2, and the rotational speed N2 of the output shaft connecting magnetic part 17D is larger than the rotational speed N1 of the input shaft connecting magnetic part 16.

  As described above, the magnetic shaft coupling structure 11D according to the fourth embodiment has different radii from r1 and r4 and is connected to the outer peripheral surface 68 with respect to the shaft (drive shaft) 13 connected to the inner peripheral surface 62. The shaft (driven shaft) 14 is eccentric.

11 D of magnetic shaft coupling structures of 4th Embodiment exhibit the effect similar to the magnetic shaft coupling structure 11 of 1st Embodiment.
Further, the magnetic shaft coupling structure 11D of the fourth embodiment can make the rotational speed of the drive shaft 13 and the rotational speed of the driven shaft 14 different.

  In addition, although the magnetic shaft coupling structure of this invention was employ | adopted for the working device 25 in embodiment, it is employable also with the various machines which employ | adopted the shaft coupling.

  The magnetic shaft coupling structure of the present invention is suitable for a working device.

1 is an external view of a working device that employs a magnetic shaft coupling structure (first embodiment) according to the present invention. It is sectional drawing of the magnetic shaft coupling structure (1st Embodiment) of this invention. It is a perspective view of the input shaft connection magnetic part and output shaft connection magnetic part with which the magnetic shaft coupling structure (1st Embodiment) of this invention is provided. FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 2 and a mechanism for transmitting power and a mechanism for facilitating removal. It is sectional drawing of 2nd Embodiment. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a figure explaining the mechanism of power transmission of a 2nd embodiment. It is explanatory drawing of 3rd Embodiment. It is a figure explaining the mechanism of power transmission and the mechanism of attachment / detachment of 3rd Embodiment. It is sectional drawing of 4th Embodiment. It is explanatory drawing of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Magnetic shaft coupling structure, 12 ... Drive source, 13 ... Rotating shaft (drive shaft), 16 ... Input shaft connection magnetic part, 17 ... Output shaft connection magnetic part, 21 ... Input part cover, 22 ... Output part cover, 62 ... inner peripheral surface, 64 ... magnet on the inner peripheral surface (inner peripheral permanent magnet), 68 ... outer peripheral surface, 71 ... magnet on the outer peripheral surface (outer peripheral permanent magnet).

Claims (4)

Magnetic shaft coupling comprising: an input shaft connecting magnetic part connected to the rotating shaft of the drive source; and an output shaft connecting magnetic part from which the rotational force is transmitted in a non-contact manner by magnetism from the input shaft connecting magnetic part In structure
A plurality of magnets are arranged at predetermined intervals so that the magnetism is repulsive to each of the input shaft connecting magnetic portion and the output shaft connecting magnetic portion ,
The input shaft connecting magnetic part includes a female joint connected to the rotating shaft, and a plurality of magnets provided around the female joint, and the magnet of the input shaft connecting magnetic part is a cup. Covered with a shaped input cover,
The input part cover is made of resin, has a gap with respect to the magnet and the female joint part of the input shaft connecting magnetic part, and is non-contacting,
The output shaft connecting magnetic part is composed of a male joint part connected to a shaft concentrically arranged with the rotary shaft, and a plurality of magnets provided around the male joint part, and the output shaft connecting magnetic part The magnet of the magnetic part is covered with the output part cover,
The output part cover is made of resin, has a gap with respect to the magnet and the male joint part of the output shaft connecting magnetic part, is non-contact, and has a convex shape that fits into the input part cover with a desired gap. Formed,
By removing the output unit cover, the output shaft connecting magnetic unit is removed,
The magnetic shaft coupling structure , wherein the input shaft connecting magnetic portion and the output shaft connecting magnetic portion are combined by fitting the output portion cover to the input portion cover .   One of the magnets is arranged in the longitudinal direction of the rotating shaft on one inner peripheral surface formed on one of the input shaft connecting magnetic portion and the output shaft connecting magnetic portion, and the other inner peripheral surface The magnetic shaft coupling structure according to claim 1, wherein the other of the magnets is arranged in the longitudinal direction of the rotating shaft on the other outer peripheral surface formed so as to oppose to the magnetic shaft.   The one magnet is disposed on the inner peripheral surface so as to be inclined with respect to the axis of the rotating shaft, and the other magnet is disposed on the outer peripheral surface in parallel with the inclined magnet. The magnetic shaft coupling structure according to claim 2, wherein   The outer diameter of the other outer peripheral surface is made different from the inner diameter of the one inner peripheral surface, and the shaft connected to the other outer peripheral surface is eccentric with respect to the axis connected to the one inner peripheral surface. The magnetic shaft coupling structure according to any one of claims 1 to 3, wherein

Images