Non-contact, load-free power transmission device

Abstract

The present invention relates to a non-contact, no-load power transmission device that can transmit power in a non-contact, no-load state using a magnet-to-non-magnet structure. To this end, the present invention provides a non-contact, no-load power transmission device that includes a first disk unit (10) coupled to either a power shaft or a load shaft and having a magnetic body on one side thereof, and a second disk unit (20) coupled to the power shaft or load shaft corresponding to the first disk unit (10) and made of a non-magnetic body that acts as an attractive force between the first disk unit (10) and the magnetic body.

Description

[Technical field]

[0001] The present invention relates to a non-contact, unloaded power transmission device capable of transmitting power in a non-contact, unloaded state by using a magnet-non-magnet structure. [Background technology]

[0002] The material described in this section merely provides background information about one embodiment of the present invention and may not constitute prior art.

[0003] Generally, there are various types of power transmission devices, of which representative ones are power transmission using gears as a means for transmitting physical force by mechanical contact, transmission using pulleys and belts, etc., and such a power transmission device consisting of a pair is called a coupler or coupling.

[0004] Such couplings are used to transmit driving force, and connect two different shafts, such as a power shaft that is connected to a motor or engine to transmit driving force, and a load shaft or driven shaft that is connected to a rotating object such as a pump, so that both shafts can rotate simultaneously.

[0005] Such couplings rotate while engaging with each other through a mechanical connection, which can cause noise, dust, vibration, reduced energy efficiency, reduced durability, mechanical burnout, and the like due to friction.

[0006] In addition, if a rotating object with a high load is located on the load shaft or driven shaft during initial operation, a high load is similarly applied to the power shaft, shortening the lifespan of the motor or engine, or, when performing an operation such as a sudden stop or a sudden change in rotation direction due to an abnormal situation, a mechanical shock is transmitted to the power shaft without any buffering, which often results in the power shaft being damaged.

[0007] Therefore, magnetic couplings using the magnetic force of magnets are used to prevent noise and vibrations that would be generated by mechanical couplings, for example, to prevent overloading of the electric motor of the power shaft when the load shaft or driven shaft stops rotating due to a foreign object being caught in a pump.

[0008] Therefore, various types of couplings have been proposed. A representative one is Korean Patent Publication No. 10-2015-0017885 (Non-contact power transmission structure using magnetic force, hereinafter referred to as "prior art", published on February 23, 2015), which relates to a structure for connecting a separated driving shaft and a driven shaft to transmit power, and specifically provides a non-contact power transmission structure using magnetic force, which is configured by a pair of magnetic bodies consisting of a first magnet formed in the center and having one of N and S poles, and a second magnet formed on the outer periphery of the first magnet and divided into multiple N and S poles, and can transmit the power of the driving shaft to the driven shaft in a non-contact state using magnetic force.

[0009] However, the above-mentioned prior art has a structure that uses attractive and repulsive forces between magnets arranged on the power shaft disk and magnets arranged on the load shaft disk, and has the disadvantage that a periodic slip phenomenon occurs, making it difficult to transmit power uniformly, and that in order to overcome the periodic slip phenomenon, an integrated structure is required.

[0010] In addition, in other general magnetic couplings, magnetic heat and resistance heat are generated due to eddy currents when attractive and repulsive forces are generated, and the high heat generated in this way is the main cause of magnetic force reduction and reduces energy efficiency. In the case of existing general couplings, this problem was solved by installing and operating a valve to adjust the flow rate, but this process is the main cause of overloading, leading to mechanical burnout and reducing energy efficiency. That is, conventional magnetic couplings have problems in that they cannot efficiently transmit the power of the motor to the driven shaft, resulting in a relatively low power transmission efficiency, and the motor's low power transmission efficiency makes it difficult to precisely control the rotation of the driven shaft. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Korean Patent Publication No. 10-2015-0017885 Summary of the Invention [Problem to be solved by the invention]

[0012] In order to solve the above-mentioned problems, an object of the present invention is to provide a magnetic coupling that can transmit power while minimizing heat generation due to slip or eddy currents by magnetic force formed between a disk including a magnetic material so that the disk can be connected to one of a power shaft or a load shaft and can operate, and a non-magnetic disk disposed on the corresponding load shaft or power shaft.

[0013] Another object of the present invention is to provide a magnetic coupling that can prevent damage to a power source such as a motor or engine of a power shaft by controlling the load of a load shaft to which a rotating object is connected.

[0014] However, the technical objectives to be achieved by this embodiment are not limited to those described above, and other technical objectives may exist. [Means for solving the problem]

[0015] As a technical means for achieving the above-mentioned technical object, a non-contact, unloaded power unit according to one embodiment of the present invention is a power transmission device composed of a power shaft and a load shaft, and includes a first disk unit (10) coupled to either the power shaft or the load shaft and having a magnetic body on one side, and a second disk unit (20) coupled to the power shaft or the load shaft corresponding to the first disk unit (10) and formed of a non-magnetic body that exerts an attractive force between itself and the magnetic body, and is characterized by operating in a non-contact, unloaded manner.

[0016] Here, by moving the first disk unit (10) and the second disk unit (20) closer or farther apart, the number of revolutions and the amount of load applied to the coupling can be controlled.

[0017] The first disk unit (10) includes a first disk (11), a magnetic body (13) radially arranged and connected to one side of the first disk (11), a magnetic force forming plate (12) in contact with one side of the magnetic body (13) to allow the magnetic force generated from the magnetic body (13) to be released to the outside, and a magnetic force forming fastening member (14) that fastens and binds the magnetic body (13) to the first disk (11) to allow the magnetic force to be released to the outside. The magnetic body (13) has a number of N poles and S poles arranged alternately, and the first disk (11) is further formed with a heat dissipation hole (112) for releasing heat generated by eddy currents generated by polarity changes caused by the rotation of the magnetic body (13).

[0018] In addition, the magnetic force forming fastening member (14) and the magnetic force forming plate (12) with which one side of the magnetic force forming fastening member (14) comes into contact are formed into a box structure that houses the magnetic body (13), and a portion of the magnetic force forming fastening member (14) faces outward, so that the magnetic force generated from the magnetic body (13) is concentrated on the second disk unit (20).

[0019] The second disk unit (20) also includes a second disk (21) and a magnetic force strengthening plate (22) coupled to one side of the second disk (21), and further includes a corrosion prevention plate (23) between the second disk (21) and the magnetic force strengthening plate (22) for preventing corrosion from occurring in the second disk (21) and the magnetic force strengthening plate (22) due to dissimilar metal corrosion, etc.

[0020] Here, the magnetic force strengthening plate (22) is further formed with heat dissipation holes (221) for discharging heat generated by eddy currents and allowing eddy currents to be generated, and the heat dissipation holes (221) are formed in various shapes such as a dot shape, a curved shape, a narrow sector shape, a modified king shape, etc.

[0021] Here, the first disk unit (10) and the second disk unit (20) can be driven by eddy currents generated by magnetic force and a rotating magnetic field even when the centers of the power shafts or load shafts connected to the first disk unit (10) and the second disk unit (20) are on the same horizontal axis, when they are shifted in any direction, either upward or downward, and when the centers of the power shafts or load shafts maintain a torsion angle. Furthermore, a plurality of load shafts can be driven corresponding to a single power shaft by eddy currents generated by magnetic force and a rotating magnetic field generated between the first disk unit (10) and the second disk unit (20).

[0022] In addition, the object of the present invention can be more effectively achieved by providing a non-contact, unloaded power transmission device, which is characterized in that only the attractive force is generated between the magnetic body and the non-magnetic body, and thus the device can be driven regardless of polarity change, and the polarity change that changes with the rotation of the magnetic body, i.e., the rotating magnetic field generates eddy currents, and the non-magnetic body rotates due to the rotating magnetic field, so that the device can be driven without physical shock or mechanical damage when suddenly stopped during operation or reversed during forward rotation, and by providing a cushioning phenomenon due to the space between the two disk units in a non-contact manner, the device can smoothly reverse rotate during operation without physical shock or mechanical damage to the power shaft and the load shaft. Effect of the Invention

[0023] According to the above-mentioned means for solving the problems of the present invention, the present invention transmits power in a non-contact and unloaded state by the magnetic force formed between a disk including a magnetic material arranged on the load shaft and a non-magnetic disk arranged on the power shaft, thereby being free from mechanical burnout, noise, vibration, and dust, and providing a stable output without periodic slip phenomenon compared to existing magnetic couplings.

[0024] In addition, the present invention has an effect of maximizing energy efficiency since forward and reverse rotation is possible through magnetic coupling of a magnet to non-magnet structure, and rotation speed and output amount can be controlled by freely adjusting the gap. [Brief description of the drawings]

[0025] [Figure 1] 1 is a diagram illustrating a configuration of a non-contact load-free power transmission device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of FIG. [Diagram 3] 2A to 2C are diagrams for explaining various forms of a magnetic force strengthening plate which is a part of the components of FIG. 1. [Figure 4] FIG. 2 is a diagram showing the first disk of FIG. 1; [Diagram 5]2 is a diagram for explaining the configuration of a magnetic force strengthening plate which is a part of the components of FIG. 1. FIG. [Figure 6] 4A to 4C are diagrams illustrating a front-rear and up-down gap adjustment process of a non-contact load-free power transmission device according to an embodiment of the present invention. [Figure 7] 7A to 7C are diagrams illustrating a process of adjusting the vertical and lateral distances between the first and second disks shown in FIG. 6. [Figure 8] 1A and 1B are diagrams illustrating a state in which a first axis of a first disk and a second axis of a second disk are deviated from a horizontal state according to an embodiment of the present invention. [Figure 9] 1 is an exemplary view illustrating a power transmission structure using a plurality of load shafts according to an embodiment of the present invention; [Figure 10] 1 is an exemplary view illustrating a power transmission method of a power transmission structure using a plurality of load shafts according to an embodiment of the present invention; [Figure 11] FIG. 1 is an exemplary diagram showing a non-contact magnetic power transmission structure using a conventional magnet-to-magnet structure; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts that are not related to the description are omitted in order to clearly explain the present invention, and similar parts are designated by similar reference numerals throughout the specification.

[0027] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where the part is "directly connected" to another part, but also the case where the part is "electrically connected" to another part via another element therebetween. Furthermore, when a part is said to "include" a certain component, this does not mean to exclude other components, but means that the part can further include other components, unless otherwise specified to the contrary, and should be understood not to preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0028] The following examples are detailed explanations to help understand the present invention, and are not intended to limit the scope of the present invention. Therefore, inventions having the same function as the present invention and the same scope are also included in the scope of the present invention.

[0029] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0030] FIG. 1 is a diagram explaining the configuration of a non-contact, unloaded power transmission device according to one embodiment of the present invention, FIG. 2 is an exploded oblique view of FIG. 1, FIG. 3 is a diagram explaining various forms of a magnetic force strengthening plate which is a component part of FIG. 1, FIG. 4 is a diagram showing the first disk of FIG. 1, and FIG. 5 is a diagram for explaining the configuration of a magnetic force strengthening plate which is a component part of FIG. 1.

[0031] Referring to Figures 1 and 2, the non-contact, unloaded power transmission device of the present invention comprises a first disk unit 10 coupled to either a power shaft or a load shaft and having a magnetic body on one side, and a second disk unit 20 coupled to the power shaft or load shaft corresponding to the first disk unit 10 and formed of a non-magnet, the first disk unit 10 and the second disk unit 20 being spaced apart while facing each other and operating in a non-contact manner.

[0032] Here, the first disk unit 10 is composed of a first disk 11, a magnetic body 13 radially arranged and connected to one side of the first disk 11, a magnetic force forming plate 12 in contact with one side of the magnetic body 13 to allow the magnetic force generated from the magnetic body 13 to be released to the outside, and a magnetic force forming fastening member 14 that fastens and binds the magnetic body 13 to the first disk 11 and allows the magnetic force to be released to the outside.

[0033] Here, the first disk 11 is formed with a shaft coupling hole 111 at the center so that either the power shaft A or the load shaft B can be fastened, and further formed with a magnetic body receiving hole 113 forming an etched space on the inside so that the magnetic body 13 can be radially arranged and coupled around the shaft coupling hole 111.

[0034] Also, a heat dissipation hole 112 is formed on the first disk 11 to dissipate heat generated by eddy currents generated by a rotating magnetic field whose polarity changes as the magnetic body 13 rotates.

[0035] Here, a plurality of heat dissipation holes 112 are formed through the first disk 11 from one surface to the other surface.

[0036] The magnetic body 13 to be fastened and coupled to the first disk 11 formed as described above can be a normal permanent magnet, but is not limited thereto and can be anything that can generate magnetic force, such as a permanent magnet or an electromagnet.

[0037] Here, the magnetic body 13 is radially arranged and coupled around the shaft coupling hole 111 of the first disk 11, and in order to compensate for the difference in rotation trajectory with respect to the distance from the central axis when the first disk unit 10 rotates, it is formed into a rectangular shape with one end longer than the other end, narrow at the top and wide at the bottom, or wide at the top and narrow at the bottom, or a shape with a sector or trapezoidal cross section and a long arc on the outside and a short arc on the inside, but is not limited thereto and can be formed into various shapes.

[0038] In addition, when the magnetic bodies 13 are arranged radially on one side of the first disk 11 with the shaft coupling hole 111 as the center, a large number of N poles and S poles are arranged alternately.

[0039] In addition, the magnetic force generating plate 12, which is in contact with one side of the magnetic body 13 and accommodated inside the magnetic body accommodating hole 113 of the first disk 11 and releases the magnetic force generated from the magnetic body 13 to the outside, is formed to have the same shape as the magnetic body 13.

[0040] Here, the magnetic force forming plate 12 is coupled to the inside of the first disk 11 to increase the magnetic permeability of the magnetic body 13 in the direction of the second disk unit 20 corresponding to the first disk unit 10 .

[0041] The magnetic force generating plate 12 is preferably made of a material that can increase the magnetic permeability of the magnetic material. In the present invention, the material may be a silicon steel plate, an amorphous magnetic material, aluminum, etc., but is not limited to these, and any material that can increase the magnetic permeability may be used.

[0042] The magnetic force forming plate 12 further includes a plurality of heat dissipation holes 121 for dissipating heat generated from the magnetic body 13 due to eddy current.

[0043] In addition, the magnetic force forming fastening member 14, which binds the magnetic body 13 that is supported with one side in contact with the magnetic force forming plate 12 and inserted so that its outer side is in contact with the inner side, is also made of the same material as the magnetic force forming plate 12.

[0044] More specifically, the magnetic force forming fastening member 14 is fastened between the inner surface of the magnetic body receiving hole 113 of the first disk 11 and the magnetic body 13 by a press fit method, thereby binding the magnetic body 13 and releasing the magnetic force of the magnetic force forming plate 12 and the magnetic body 13 to the outside, thereby improving the magnetic permeability.

[0045] Therefore, the magnetic force forming fastening member 14 and the magnetic force forming plate 12 with which one side of the magnetic force forming fastening member 14 comes into contact are formed into a box structure that houses the magnetic body 13, and by making a portion of the magnetic force forming fastening member 14 face outward, the magnetic force generated from the magnetic body 13 is concentrated in the direction of the second disk unit 20.

[0046] The second disk unit 20 corresponds to the first disk unit 10, has one side spaced therefrom, and is fastened to a power shaft or load shaft corresponding to the power shaft or load shaft coupled to the first disk unit 10. The second disk unit 20 is made of a non-magnetic material so that it can rotate by the magnetic force generated from the magnetic material of the first disk unit 10.

[0047] Here, the non-magnetic body is made of a metallic or non-metallic material capable of maintaining an attractive force between itself and the magnetic body, but any material capable of maintaining an attractive force between itself and the magnetic body is acceptable.

[0048] More specifically, it refers to a metal disk or a synthetic resin containing metal powder and is capable of maintaining an attractive force with a magnetic body.

[0049] The second disk unit 20 as described above is composed of a disk-shaped second disk 21 having a shaft coupling hole 211 at its center to which one of the power shaft A or the load shaft B can be fastened, and further having a plurality of heat dissipation holes 212 formed around the fastening hole 211.

[0050] Here, the heat dissipation holes 212 are formed radially around the shaft coupling hole 211 .

[0051] In addition, a magnetic force strengthening plate 22 is provided on one side of the second disk 21 to correspond to eddy currents generated from the first disk unit 10 or to increase the attractive force due to the magnetic force generated from the magnetic body 13, and a corrosion prevention plate 23 is further provided between the magnetic force strengthening plate 22 and the second disk 21 to prevent corrosion from occurring due to dissimilar metal corrosion, etc.

[0052] Here, the corrosion prevention plate 23 is preferably formed from a heat absorbing material such as ceramic paper to prevent corrosion between dissimilar metals and absorb heat, but is not limited thereto and can be any material that can prevent corrosion caused by eddy currents between dissimilar metals.

[0053] The magnetic force strengthening plate 22 further includes a heat dissipation hole 221 for dissipating heat generated by eddy current and generating eddy current.

[0054] Here, as shown in FIG. 3, the heat dissipation holes 221 may be arranged radially in various shapes such as a dot shape, a curved shape, a narrow sector shape, a modified king shape, etc.

[0055] In this way, by discharging the heat generated by the eddy current to the outside, it is possible to prevent a decrease in the magnetic force of the magnetic body 13 due to magnetic heat and resistance heat, and to ensure that the rotational power generated from the power shaft is smoothly transmitted to the load shaft.

[0056] FIG. 6 is a diagram explaining the process of adjusting the front-to-back and top-to-bottom spacing of a non-contact, unloaded power transmission device according to one embodiment of the present invention, FIG. 7 is a diagram explaining the process of adjusting the top-to-bottom and left-to-right spacing between the first and second disks of FIG. 6, FIG. 8 is a diagram explaining a state in which the first axis of the first disk and the second axis of the second disk are deviated from a horizontal state according to one embodiment of the present invention, and FIG. 9 is an illustrative diagram explaining a power transmission structure applying multiple load shafts according to one embodiment of the present invention.

[0057] FIG. 10 is an exemplary view for explaining a power transmission method of a power transmission structure to which a plurality of load shafts are applied according to an embodiment of the present invention.

[0058] 6 to 10, the non-contact loadless power transmission device according to the present invention can adjust the rotation speed and the load amount in a loadless state by adjusting the distance between the disks and the arrangement direction in various directions such as vertical, horizontal, up-down, left-right, etc. between the first disk unit 10 and the second disk unit 20. To this end, the loadless magnetic coupling allows an administrator to manually or automatically set the distance between the first disk unit 10 and the second disk unit 20 using a control means (not shown).

[0059] More specifically, the load force applied to the non-contact unloaded power transmission device can be adjusted by moving the position of the second disk unit 20 connected to the load shaft B closer or farther away.

[0060] For example, by adjusting the distance between the adjacent surfaces of the first disk unit 10 and the second disk unit 20 to attenuate or increase the magnetic force of the magnetic material, it is possible to adjust the driving force of the power shaft A or the load amount of the load shaft B.

[0061] As shown in Figures 6 and 7, assuming that the power shaft A or the load shaft B is the first shaft A and the second shaft 2, the distance between the first disk unit 10 and the second disk unit 20 can be reduced or increased when both shafts are on the same horizontal axis, and the distance between the first disk unit 10 and the second disk unit 20 can also be reduced or increased when the first shaft A and the second shaft B are not located on the same horizontal axis but are shifted upward or downward.

[0062] Meanwhile, even if the first axis A and the second axis B are completely deviated from the horizontal axis as shown in Fig. 8, the alignment and balance can overcome the torsion angle limit in any direction. Therefore, in the case of the existing magnetic coupling, a magnetic body is provided on one side and another magnetic body is provided on the other side corresponding to the magnetic body. When the polarity of the magnetic bodies is changed by rotation, attractive and repulsive forces are generated alternately. Therefore, when both axes are deviated from the same axis, the two sides are coupled by attractive forces or separated by repulsive forces, which overcomes the problem that the operation is not possible.

[0063] To this end, the present invention provides a coupling having a magnetic body on one side and a non-magnetic body on the corresponding other side that is capable of maintaining an attractive force between the magnetic body, so that even if the two shafts are not positioned on the same line or there is a certain angle between the two shafts, the coupling can rotate due to the magnetic force and eddy currents generated by the rotation of the magnetic force.

[0064] However, in the case of existing magnetic couplings, when controlling a sudden stop during operation or reverse rotation during forward rotation, the polarity of the opposing magnetic bodies changes and attractive and repulsive forces occur simultaneously, making this impossible. However, in the non-contact, unloaded power transmission device of the present invention, only attractive force occurs in a non-contact, unloaded state, so it can be driven regardless of polarity changes. Furthermore, eddy currents are generated by the polarity change that changes with the rotation of the magnetic body, i.e., the rotating magnetic field, and the non-magnetic body rotates due to the rotating magnetic field, so it is possible to drive without physical shock or mechanical damage when a sudden stop during operation or reverse rotation during forward rotation occurs.

[0065] In addition, the non-contact type provides a cushioning effect by providing a space between the two disk units, allowing smooth reverse rotation during operation without physical impact or mechanical damage to the power shaft and load shaft.

[0066] In this way, the non-contact, load-free power transmission device transmits power by the magnetic force formed between the disk unit arranged on the load shaft, i.e., the driven shaft, and the disk unit arranged on the power shaft, and by the rotation of the magnetic force, i.e., eddy currents generated by the rotating magnetic field, and can transmit power in a completely non-contact, load-free state due to the magnet-non-magnet structure. Therefore, compared to existing magnetic couplings (see FIG. 11), it is free from mechanical burnout, noise, vibration, and dust, and improves energy efficiency.

[0067] In addition, by adjusting the distance between the power shaft and the load shaft to adjust the RPM and load of the load shaft, the inconvenience of having to replace the motor or engine according to the maximum RPM in order to change the RPM of the motor or engine having the same torque in a drive system using a conventional motor and engine can be easily overcome.

[0068] To explain in more detail, even if a motor has the same torque, it has been used with various numbers of poles such as 2 poles, 4 poles, 6 poles, etc. depending on the number of poles of the magnetic body built in. For example, in the case of a motor using 4 poles at the same frequency of 60Hz, the maximum rotation speed is maintained at 1800rpm, whereas in the case of a motor using 6 poles, the maximum rotation speed is maintained at 1200rpm.

[0069] Therefore, in order to control the rotation speed of the load shaft, it is necessary to change the motor of the power shaft, which is inconvenient, and even if the same motor is used, there is a problem that a separate transmission such as a reducer is still required.

[0070] In addition, the present invention can simultaneously adjust the rotation speed and the load amount in a no-load state by adjusting the distance between the first disk unit 10 and the second disk unit 20 in various ways, thereby maximizing energy efficiency.

[0071] In addition, the problem with the existing magnetic coupling is that the magnetic force is reduced due to magnetic heat and resistance heat generated during the magnetic force formation process, and that this not only accelerates the corrosion of the components, but also increases the durability of the product by further preventing corrosion through the provision of the corrosion prevention plate 23, thereby further extending the expected mechanical lifespan.

[0072] As described above, the non-contact loadless power transmission device of the present invention has better mechanical efficiency and energy efficiency with lower installation and maintenance costs compared to expensive inverters and fluid couplings, and can operate even if the first shaft A of the power shaft and the second shaft B of the load shaft are not perfectly horizontal, overcoming the limitations of the torsion angle such as alignment and balance.

[0073] Also, by configuring the power shaft A to be movable as shown in FIG. 9, it is possible to arrange a plurality of load shafts B on a single power shaft A and drive them.

[0074] To explain in more detail, a single power shaft A is arranged to be movable and multiple load shafts B are arranged facing each other, and then the power shaft A is moved close to the load shaft B that needs to be driven to drive that load shaft B, or the power shaft A is arranged close to multiple load shafts B (see Figure 10) to drive the load shaft B by magnetic force and eddy currents.

[0075] Here, the power shaft A can be moved forward and backward, left and right, up and down, or in all directions that are movable in a space in which the drive from the power shaft to the load shaft can be controlled, so that the drive of the load shaft B arranged to face the power shaft A can be controlled.

[0076] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not limiting. For example, each component described as a single type can be implemented in a distributed form, and similarly, each component described as a distributed type can be implemented in a combined form.

[0077] The scope of the present invention is determined by the claims set forth below rather than the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention. [Explanation of symbols]

[0078] 10 First Disk Unit 11 Disc 1 12 Magnetic force forming plate 13 Magnetic material 14 Magnetically-formed fasteners 20 Second disk unit 21 Disc 2 22 Magnetic reinforcement plate 23 Corrosion prevention plate

Claims

1. A power transmission device comprising a power shaft and a load shaft, a first disk unit (10) coupled to either the power shaft or the load shaft and having a magnetic body on one side thereof; a second disk unit (20) coupled to the other of the power shaft or the load shaft and made of a non-magnetic material that exerts an attractive force between itself and the magnetic material; The first disk unit (10) includes a first disk (11), a magnetic body (13) radially arranged and coupled to one side of the first disk (11), a magnetic force forming plate (12) in contact with one side of the magnetic body (13) to allow a magnetic force generated from the magnetic body (13) to be released to the outside, and a magnetic force forming fastening member (14) that fastens and binds the magnetic body (13) to the first disk (11) to allow a magnetic force to be released to the outside, The magnetic force forming fastening member (14) and the magnetic force forming plate (12) with which one side of the magnetic force forming fastening member (14) is in contact are formed into a box structure that houses the magnetic body (13), and a part of the magnetic force forming fastening member (14) faces outward, so that the magnetic force generated from the magnetic body (13) is concentrated on the second disk unit (20), A non-contact, unloaded power transmission device that operates in a non-contact, unloaded manner.

2. 2. The non-contact, unloaded power transmission device according to claim 1, characterized in that the rotational speed and the load applied to the coupling are controlled by moving the first disk unit (10) and the second disk unit (20) apart or close to each other.

3. 2. The non-contact, load-free power transmission device according to claim 1, wherein the magnetic body (13) has a plurality of N poles and S poles arranged alternately.

4. 2. The non-contact, load-free power transmission device as claimed in claim 1, further comprising a heat dissipation hole (112) formed in the first disk (11) for dissipating heat generated by eddy currents generated by polarity changes caused by the rotation of the magnetic body (13).

5. The second disk unit (20) includes a second disk (21) and a magnetic force strengthening plate (22) coupled to one side of the second disk (21), 2. The non-contact, load-free power transmission device according to claim 1, wherein the magnetic reinforcing plate (22) is capable of responding to eddy currents generated from the first disk unit (10) or increasing the attractive force due to the magnetic force generated from the magnetic body (13).

6. The non-contact, unloaded power transmission device of claim 5, further comprising a corrosion prevention plate (23) between the second disk (21) and the magnetic force strengthening plate (22) for preventing corrosion of the second disk (21) and the magnetic force strengthening plate (22) due to dissimilar metal corrosion or the like.

7. The non-contact, load-free power transmission device according to claim 5, characterized in that the magnetic force reinforcement plate (22) is further formed with heat dissipation holes (221) for discharging heat generated by eddy currents and enabling eddy currents to be generated, and the heat dissipation holes (221) are formed in various shapes such as a dot shape, a curved shape, a narrow sector shape, a modified king shape, etc.

8. The non-contact, unloaded power transmission device according to any one of claims 1 to 7, characterized in that the first disk unit (10) and the second disk unit (20) can be driven by eddy currents generated by magnetic force and a rotating magnetic field even when the centers of the power shaft or the load shaft connected to the first disk unit (10) and the second disk unit (20) are on the same horizontal axis, when the centers are shifted in any direction, either upward or downward, and when the centers of the power shaft or the load shaft maintain a torsion angle.

9. 2. The non-contact, load-free power transmission device according to claim 1, characterized in that a plurality of load shafts can be driven corresponding to a single power shaft by eddy currents generated by the magnetic force and rotating magnetic field generated between the first disk unit (10) and the second disk unit (20).

10. 2. The non-contact, no-load power transmission device of claim 1, wherein only an attractive force is generated between the magnetic body and the non-magnetic body, and the device can be driven regardless of polarity change; the polarity change that changes with the rotation of the magnetic body, i.e., the rotating magnetic field generates eddy currents, and the non-magnetic body rotates due to the rotating magnetic field, and the device can be driven without physical shock or mechanical damage when suddenly stopped during operation or reversed during forward rotation; and the non-contact, no-load power transmission device of claim 1, wherein a cushioning phenomenon is provided by the space between the two disk units, and the device can smoothly reverse during operation without physical shock or mechanical damage to the power shaft and the load shaft.

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