JP2016211667A - Magnetic type gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic type gear device that can be assembled into a device of a tight-sealed structure and perform an efficient high rate rotational speed conversion.SOLUTION: A magnetic type gear device comprises: a first member 6 having nsets of first magnet sets 12 composed of two permanent magnet pieces of their magnetization directions opposite to each other equally spaced apart in a circumferential direction and fixed at a first cylindrical yoke 11 made of magnetic material; a second member 7 having nsets of second magnet sets 14 composed of two permanent magnet pieces of their magnetization directions opposite to each other equally spaced apart in a circumferential direction and fixed at a second cylindrical yoke 15 made of magnetic material; and a third member 8 having the number of nof tooth profile members 13 made of magnetic material equally spaced apart in a circumferential direction at a cylindrical holder made of non-magnetic material. The magnetic type gear device also comprises a second transmission 2 at an inside region of an inner circumferential surface of the second yoke 15 of the second member 7 so as to convert a rotational speed of the second member 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic gear device including a magnetic gear that performs rotational speed conversion, and more particularly to a magnetic gear device that can be miniaturized.

  A gear device is a mechanical element that transmits rotation, torque, and the like, and a general gear device transmits rotation and the like when the teeth of the driving gear and the teeth of the driven gear come into contact with each other. Therefore, the driving side gear and the driven side gear are arranged in the same space, and the driving side gear and the driven side gear cannot be separated.

  On the other hand, the magnetic gear device has no teeth like a general gear device, and transmits rotation and torque in a non-contact manner by magnetic force. Thus, in addition to the feature that lubrication is not required and dust is not generated and the service life is long, there is a feature unique to the magnetic gear device that the driving gear and the driven gear can be separated by a partition wall or the like. Due to this feature, for example, when a magnetic gear device is used for a device that is used for a long time in a harsh environment such as seawater, the device side is placed inside the device by a driving gear arranged in the sea outside the device while having a sealed structure. A configuration is possible in which the arranged driven gear is driven. This makes it possible to stably drive a device such as a generator connected to the driven gear inside the device for a long period of time without being exposed to a harsh environment.

  However, a maximum transmission ratio of about 1:20 to 1:30 is required for a transmission used in such a device, and it is difficult to achieve such a transmission ratio with a single magnetic gear device. As a countermeasure, it is possible to realize the required gear ratio by laminating a plurality of magnetic gear devices in the axial direction, but there is a problem that it becomes longer in the axial direction.

  On the other hand, in Patent Document 1 (Japanese Patent Laid-Open No. 2014-15992), a second magnetic gear device connected to the first rotating shaft is provided on the outer periphery of the first magnetic gear device, and is parallel to the rotating shaft. There has been proposed a configuration of a magnetic gear device that can increase the reduction ratio by making the magnetic gear device in two stages without increasing the size in any direction.

  However, in the magnetic gear device having such a two-stage configuration, since the reduction ratio can be increased, the rotation speed of one of the magnetic gears is increased, and the eddy current loss in the magnetic gear rotating at this high speed is increased and the efficiency is lowered. There is a problem. As a countermeasure, Patent Document 1 describes that the magnetic gear device is formed of an electromagnetic steel plate in which a plurality of members constituting the magnetic gear device are laminated. However, although this measure can reduce eddy current loss, in particular, since the driven gear rotates at high speed, eddy current loss cannot be avoided, and efficiency reduction due to eddy current loss cannot be avoided. Moreover, since it became the structure which laminated | stacked the steel plate, there existed a subject that manufacture of a member became difficult.

JP 2014-15992 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a magnetic gear device that can be incorporated into a device having a sealed structure and can efficiently convert a rotational speed at a large ratio.

The invention according to claim 1 in the magnetic gear device of the present invention,
A first magnet set comprising two permanent magnet pieces having a cylindrical first yoke made of a magnetic material, magnetized in the radial direction of the first yoke, and magnetized in opposite directions. A _first member fixed to the inner cylindrical surface of the first yoke at n ₁ set at equal intervals in the circumferential direction;
A second magnet set comprising two permanent magnet pieces each having a cylindrical second yoke made of a magnetic material, magnetized in the radial direction of the second yoke, and magnetized in opposite directions; A _second member fixed to the outer cylindrical surface of the second yoke at n ₂ sets at equal intervals in the circumferential direction;
A cylindrical holder made of a non-magnetic material has a third member in which n ₃ tooth-shaped members of the same shape made of a magnetic material are fixed at equal intervals in the circumferential direction;
The first member, the second member, and the third member are arranged to have the same central axis,
The second member is disposed inside the first member;
The tooth-shaped member of the third member is a magnetic gear device fixedly disposed between the second member and the first member,
A second transmission having a central axis identical to the central axis for converting the rotational speed of the second member is provided in a region inside the inner peripheral surface of the second yoke of the second member. It is characterized by being.

In the present invention, since the second transmission device is arranged inside the magnetic gear device that is the first transmission device, the space inside the magnetic gear device that is not used in a normal structure can be used effectively, and the two-stage type. The transmission can be made small.
In addition, since the first transmission is a magnetic gear unit, the holder of the third member of the first transmission can be used as a partition wall that separates the outside and the inside of the device at the use destination. It becomes possible to make it a sealed structure, and the second member of the first transmission and the second transmission can be accommodated inside the partition wall.
Thereby, the magnetic gear device of the present invention can be provided in a magnetic gear device that can be incorporated in a device having a sealed structure and can efficiently convert a rotational speed at a large ratio.

The invention according to claim 2 of the present invention is the magnetic gear device according to claim 1, wherein the second transmission is a planetary gear mechanism.
In the present invention, since the second transmission device is a planetary gear mechanism, the second transmission device can avoid eddy current loss generated in the magnetic gear device, and can provide a more efficient magnetic gear device. .

In the invention according to claim 3 of the present invention, the teeth of the outer peripheral gear of the planetary gear mechanism are formed on the inner peripheral surface of the second yoke, and the sun gear and the planetary gear of the planetary gear mechanism are The magnetic gear device according to claim 2, wherein the magnetic gear device is replaceable.
In the present invention, since the teeth of the outer peripheral gear of the planetary gear mechanism are manufactured on the inner peripheral surface of the second yoke, the number of parts can be reduced and the structure can be simplified. Moreover, since the sun gear and the planetary gear of the planetary gear mechanism can be exchanged, the gear ratio of the second transmission can be changed variously, and an appropriate gear ratio can be selected according to the application / purpose. Become.
As a result, the magnetic gear device of the present invention has a simple structure and can provide a magnetic gear device having an appropriate gear ratio according to the application / purpose.

The invention according to claim 4 of the present invention is the magnetic gear device according to claim 2 or 3, wherein the planetary gear mechanism is configured by a non-contact gear. .
In the present invention, the planetary gear mechanism that is the second transmission is configured by a non-contact type gear such as a magnetic gear. Therefore, if the eddy current generated in the second transmission is not a problem depending on the application / standard, it is longer. A long-lived magnetic gear device can be provided.

  In the magnetic gear device of the present invention, since the second transmission device is arranged inside the magnetic gear device that is the first transmission device, the space inside the magnetic gear device can be used effectively, and the two-stage type. The transmission can be made small. In addition, since the first transmission device is a magnetic gear device, it is possible to provide a magnetic gear device that can be incorporated into a device having a sealed structure and can efficiently convert a rotational speed at a large ratio.

It is a top view which shows the structure of the 1st Example of this invention. It is a disassembled perspective view which shows the structure of a present Example. It is sectional drawing which shows the state which attached to the apparatus the magnetic gear apparatus which concerns on a present Example. It is a top view which shows the structure of the 2nd Example of this invention.

  Embodiments of a magnetic gear device according to the present invention will be described below with reference to the drawings.

[First embodiment]
1 to 2 show a first embodiment of a magnetic gear device according to the present invention. FIG. 1 is a plan view showing the configuration of this embodiment, and FIG. 2 is an exploded perspective view showing the configuration of this embodiment.

  In the first embodiment of the magnetic gear device according to the present invention, as shown in FIG. 1 and FIG. 2, a planetary gear device is formed inside a first transmission 1 consisting of a substantially disk-shaped magnetic gear device. A second transmission 2 is arranged.

  The first transmission 1 includes a first member 6, a second member 7, and a third member 8 having the same central axis. The first member 6 is connected to an input shaft (not shown), the second member 7 is rotatably supported on the same axis as the central axis of the first member 6, and the third member 8 is a device (not shown). Fixed to.

The first member 6 is the outermost peripheral portion of the first transmission 1, and is arranged in the circumferential direction of the substantially cylindrical first yoke 11 made of a soft magnetic material and the inner cylindrical surface of the first yoke 11. It consists of a first magnet set 12 composed of two substantially tile-like permanent magnet pieces, each having n ₁ set fixed at equal intervals.
The two permanent magnet pieces of the first magnet set 12 are magnetized in the radial direction of the first yoke 11, and the magnetization directions of the two permanent magnet pieces are opposite to each other.

Inside the first member 6 is a substantially cylindrical holder made of a non-magnetic material, and a tooth profile member made of a soft magnetic material that is arranged in the holder at n ₃ intervals at equal intervals in the circumferential direction. 13 is held. The substantially cylindrical holder is provided with a required shape such as closing one open end, extending the cylindrical shape up and down, adding a flange shape, and the like to form a partition wall 16, and this partition wall 16 and n ₃ tooth profile members 13 constitutes the third member 8.

Inside the third member 8, a substantially cylindrical second yoke 15 made of a soft magnetic material and n ₂ pairs are fixed at equal intervals in the circumferential direction of the outer cylindrical surface of the second yoke 15. In addition, a second member 7 composed of a second magnet set 14 composed of two substantially tile-like permanent magnet pieces is disposed. The two permanent magnet pieces of the second magnet set 14 are magnetized in the radial direction of the second yoke 15, and the magnetization directions of the two permanent magnet pieces are opposite to each other.

  In the first transmission 1 having the above configuration, when the first member 6 connected to an input shaft (not shown) rotates, the first magnet set 12 of the first member 6 and the second member 7 of the second member 7 are rotated. The magnetic coupling state of the magnet assembly 14 changes via the tooth-shaped member 13 of the fixed third member 8, whereby the second member 7 rotates in the direction opposite to the rotation direction of the first member 6. .

At this time, the ratio of the rotational speeds of the first member 6 and the second member 7, that is, the gear ratio is n ₁ / n ₂ . Here, n ₁ is the number of first magnet sets 12, and n ₂ is the number of second magnet sets 14.
Further, the number of sets _{n 1} of the first magnet assembly 12, the number _{n 3} of the second set number _{n 2} and toothed member 13 of the magnet sets 14,
n ₃ = n ₁ ± n ₂
It is said that this is preferable.

  In the present embodiment, the number of sets of the first magnet set 12 is 14, and the number of sets of the second magnet set 14 is 3. Therefore, the transmission ratio of the first member 6 and the second member 7 is 4.67. Double the speed. The number of the tooth profile members 13 is 17.

  The second transmission device 2 including the planetary gear mechanism is disposed inside the second member 7 of the first transmission device 1, and the second cylinder 7 of the second member 7 has a second yoke 15 on the inner cylindrical surface thereof. An internal gear of the outer peripheral gear 21 of the planetary gear mechanism of the transmission 2 is formed, a sun gear 23 is disposed on the same central axis as the central axis of the outer peripheral gear 21, and the sun gear 23 is connected to an output shaft (not shown). Between the outer peripheral gear 21 and the sun gear 23, a plurality of planetary gears 22 that are rotatably held by a carrier 24 with pins or the like (not shown) are arranged, and the rotation of the outer peripheral gear 21 is transmitted to the sun gear 23 via the planetary gears 22. Communicated.

In the planetary gear mechanism, various speed change operations are possible, but in this embodiment, the carrier 24 is fixed and used. Thereby, when the outer peripheral gear 21 rotates, the planetary gear 22 is rotated, and the sun gear 23 is further rotated.
At this time, if the number of teeth of the sun gear 23 is Za and the number of teeth of the outer peripheral gear 21 is Zc, the sun gear 23 is a ratio of the number of teeth Zc of the outer peripheral gear 21 to the number of teeth Za of the sun gear 23, that is, Zc / Za times. The speed is changed (increased).

If the number of teeth of the planetary gear 22 is Zb and the number of the planetary gears 22 is N, the planetary gear mechanism does not collide with the arranged planetary gears 22 and the number of teeth Za, Zb, Zc and N Must have the following relationship:
・ Za + 2Zb = Zc
• (Za + Zc) / N is an integer.

In the planetary gear mechanism of this embodiment, the number of teeth of the sun gear 23 is 40, the number of teeth of the planetary gear 22 is 30, the number of teeth of the outer peripheral gear 21 is 100, and the number of planetary gears 22 is 4. Thereby: 40 + 2 × 30 = 100
・ (40 + 100) / 4 = 35
Thus, the above relationship is established. The gear ratio (speed increase ratio) is 100/40 = 2.5 (reverse rotation).

Therefore, the overall gear ratio (speed increase ratio) of the magnetic gear device of the present embodiment is 4.67 × 2.5 = 11.675.
It becomes.

  As described above, in the magnetic gear device of the present embodiment, the second transmission device 2 including the planetary gear mechanism is disposed inside the first transmission device 1 including the magnetic gear device. As a result, the rotation input to the magnetic gear device can be increased in two stages of the first transmission device 1 and the second transmission device 2. Further, since the second transmission device 2 is arranged inside the first transmission device 1, it is possible to avoid the magnetic gear device from being elongated in the axial direction, and a magnetic gear device that is small in size and has a large rotational speed conversion ratio can be obtained. Can be provided.

  In general, in gear devices using magnetism, efficiency decreases due to eddy current generated by rotation of the magnetic gear, that is, eddy current loss occurs, and eddy current loss increases as the rotational speed of the magnetic gear increases. In the magnetic gear device of the example, the first transmission device 1 having a gear ratio of 4.67 times and a relatively low rotation speed is a magnetic gear device, and the second transmission device having a gear ratio of 11.675 times and a high rotation speed. No. 2 was a mechanical planetary gear mechanism and avoided the occurrence of large eddy current loss. As a result, in the magnetic gear device of the present embodiment, efficiency reduction due to eddy current loss can be avoided, so that a magnetic gear device having a small size, a large rotation speed conversion ratio, and high efficiency can be provided.

  In the magnetic gear device of the present embodiment, the second transmission 2 is a mechanical planetary gear mechanism, the number of teeth of the sun gear 23 is 40, the number of teeth of the planetary gear 22 is 30, and the number of teeth of the outer peripheral gear 21. Is 100 and the number of planetary gears 22 is 4. However, the number of teeth of the sun gear 23, the number of teeth of the planetary gear 22, and the number of teeth of the outer peripheral gear 21 can be changed as long as the required number of teeth is satisfied. The speed increase ratio can also be changed.

For example, if the number of teeth of the outer peripheral gear 21 remains 100, the number of teeth of the sun gear 23 is 50, the number of teeth of the planetary gear 22 is 25, and the number of the planetary gears 22 is 3, 50 + 2 × 25 = 100
・ (50 + 100) / 3 = 50
Thus, the relationship of the number of teeth is established.
At this time, the gear ratio (speed increase ratio) is 100/50 = 2 (reverse rotation), and the overall gear ratio (speed increase ratio) of the magnetic gear device is 4.67 × 2 = 9.34.

  As described above, in the second transmission device 2 including the planetary gear mechanism, the gear ratio of the planetary gear mechanism can be changed by changing the number of teeth of the sun gear 23, the planetary gear 22, and the outer peripheral gear 21. Accordingly, an appropriate overall gear ratio of the magnetic gear device can be selected.

  In the above description, the gear ratio is changed by recombining the sun gear 23 and the planetary gear 22 without changing the number of teeth of the outer peripheral gear 21. In such a change, the planetary gear 22 and the sun gear 23 can be exchanged by simply removing a pin or the like (not shown) that holds the planetary gear 22 on the carrier 24 and removing the carrier 24, and the gear ratio can be changed easily. .

  As described above, in the present embodiment, since the sun gear 23 and the planetary gear 22 of the planetary gear mechanism that is the second transmission device 2 can be exchanged, the gear ratio of the second transmission device 2 can be variously changed. It is possible to provide a magnetic gear device having an appropriate gear ratio according to the application / purpose.

  However, the change of only the sun gear 23 and the planetary gear 22 as described above is simple, but the change range of the gear ratio cannot be selected widely because of the number of teeth required for the planetary gear mechanism. On the other hand, if all the numbers of teeth of the outer peripheral gear 21, the sun gear 23, and the planetary gear 22 are changed, the recombination becomes large-scale, but the gear ratio can be changed more widely.

  Next, a structure for attaching the magnetic gear device according to the present embodiment to a device will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a state in which the magnetic gear device according to the present embodiment is attached to a device.

  In the magnetic gear device of the present embodiment, the substantially flange-shaped attachment provided on the partition wall 16 of the third member 8 of the first transmission 1 covers the opening 91 provided at one end of the device 9. The end of the substantially cylindrical partition wall 16 on the side opposite to the flange side is closed. As a result, the opening 91 of the device 9 is blocked by the partition wall 16, and the device 9 has a sealed structure.

  The second member 7 of the first transmission 1 is disposed on the opening 91 side of the partition wall 16, that is, inside the device 9 sealed with the partition wall 16. The second transmission device 2 is disposed inside the second member 7 of the first transmission device 1, the output of the second transmission device 2 is transmitted to the output shaft 19, and the output shaft 19 is inside the device 9. To drive a device such as a generator.

  The first member 6 of the first transmission 1 is disposed on the side opposite to the opening 91 of the partition wall 16, that is, on the outer side of the device 9 sealed by the partition wall 16, and the first member 6 is rotated by a tidal current or the like. Connected to the input shaft 18.

The first member 6 and the second member 7 of the first transmission 1 are magnetically coupled via the tooth-shaped member 13 of the third member 8, and the second member 6 is rotated by the rotation of the first member 6. The member 7 is rotated. As a result, the rotation of the input shaft 18 outside the device 9 is accelerated and transmitted to the inside of the device 9 by the first transmission 1, and the rotation transmitted to the inside of the device 9 is further accelerated by the second transmission 2. And transmitted to the output shaft 19.
As described above, the rotation of the input shaft 18 due to the power flow or the like is accelerated and transmitted to the output shaft 19, and a device such as a generator inside the device 9 is driven.

As described above, when the magnetic gear device according to the present embodiment is attached to the device 9, the partition wall 16 of the first transmission 1 can close the opening 91 of the device 9, and the device 9 has a sealed structure. The rotation of the input shaft 18 outside the device 9 is transmitted to the output shaft 19 inside the device 9 via the first transmission device 1 and the second transmission device 2, and the device and the like inside the device 9 are transmitted. Can be driven.
Thereby, the magnetic gear device according to the present embodiment can be provided in a magnetic gear device that can be incorporated in a device having a sealed structure and can efficiently convert a rotational speed at a large ratio.

  In the above-described embodiment, the number of the first magnet sets 12 of the first transmission 1 including the magnetic gear unit is 14, the number of the second magnet sets 14 is 3, and the first member 6 and the second member 7 are increased in speed by 4.67 times, but the number of first magnet sets 12 and the number of second magnet sets are determined according to the application / purpose of the magnetic gear device. 14 is changed so that the gear ratio of the first member 6 and the second member 7 is smaller than one, that is, the first magnet set 12 and the second magnet set 14 are decelerated. The same effect can be obtained even if the number is set.

In the above embodiment, the first magnet set 12 composed of two permanent magnet pieces whose magnetization directions are opposite to each other is fixed in the circumferential direction of n ₁ set, and the two magnetization directions are opposite to each other. Although it has been described that the second magnet set 14 made of permanent magnet pieces is fixed in the circumferential direction of n ₂ sets, the n ₁ set of first magnet sets 12 and the n ₂ set of second magnet sets 14 are respectively The same effect can be obtained also in an aspect in which a plurality of poles are magnetized on an integral ring magnet, or in a state in which a ring magnet having a plurality of poles is divided into a plurality of parts.

[Second Embodiment]
Next, a second embodiment of the magnetic gear device according to the present invention will be described with reference to FIG. FIG. 4 is a plan view showing the configuration of the second embodiment of the present invention.

  In the second embodiment of the magnetic gear device according to the present invention, as shown in FIG. 4, a second transmission device 4 comprising a magnetic planetary gear device is provided inside the substantially disc-shaped first transmission device 1. It is arranged.

  The configuration of the first transmission 1 is substantially the same as the configuration of the first transmission 1 in the first embodiment of the present invention, but the inner cylindrical surface of the second yoke 15 has a mechanical tooth profile. Instead, a magnetic pattern that forms the magnetic outer peripheral gear 41 constituting the magnetic planetary gear device of the second transmission 4 is formed.

The second transmission 4 includes a magnetic outer gear 41 provided on the inner cylindrical surface of the second yoke 15 and a magnetic sun gear 43 disposed on the same central axis as the central axis of the magnetic outer gear 41. And a plurality of magnetic planetary gears 42 rotatably held by a carrier 44 between the magnetic outer peripheral gear 41 and the magnetic sun gear 43.
The rotation of the magnetic outer peripheral gear 41 is transmitted to the magnetic sun gear 43 via the magnetic planetary gear 42, and an output shaft (not shown) connected to the magnetic sun gear 43 rotates.

  In the magnetic gear device according to the second embodiment of the present invention, since the second transmission device 4 and the first transmission device 1 are also non-contact magnetic transmission mechanisms, contact transmission is performed as a whole of the magnetic gear device. It is possible to provide a transmission mechanism that has no part, does not require lubrication, does not generate dust, and has a long life.

  However, since the second transmission device 4 having a high rotational speed is a magnetic transmission mechanism, efficiency reduction due to eddy current loss in the second transmission device 4 is inevitable. However, if the eddy current generated in the second transmission 4 is not a problem depending on the application / standard, such as a required rotation speed of the output shaft is small, the second transmission 4 is connected to a non-contact type such as a magnetic gear. By constituting with a gear, a magnetic gear device having a longer life can be provided.

INDUSTRIAL APPLICABILITY The present invention can be used for a magnetic gear device that is used in various harsh environments and is incorporated in a device that requires hermeticity, and can be downsized and improved in efficiency.
It should be noted that the present invention is not limited to the matters described in the above embodiments, and includes various modifications and corrections that can be conceived by those having ordinary knowledge in the field of the present invention. Needless to say, even if there is a design change within a range that does not deviate from the above, it is included in the present invention.

DESCRIPTION OF SYMBOLS 1 1st transmission device 2 2nd transmission device 4 2nd transmission device 6 1st member 7 2nd member 8 3rd member 9 Equipment 11 1st yoke 12 1st magnet set 13 Tooth profile member 14 Second magnet set 15 Second yoke 16 Bulkhead 18 Input shaft 19 Output shaft 21 Outer gear 22 Planetary gear 23 Sun gear 24 Carrier 41 Magnetic outer gear 42 Magnetic planetary gear 43 Magnetic sun gear 44 Carrier 91 Opening

Claims (4)

A first magnet set comprising two permanent magnet pieces having a cylindrical first yoke made of a magnetic material, magnetized in the radial direction of the first yoke, and magnetized in opposite directions. A _first member fixed to the inner cylindrical surface of the first yoke at n ₁ set at equal intervals in the circumferential direction;
A second magnet set comprising two permanent magnet pieces each having a cylindrical second yoke made of a magnetic material, magnetized in the radial direction of the second yoke, and magnetized in opposite directions; A _second member fixed to the outer cylindrical surface of the second yoke at n ₂ sets at equal intervals in the circumferential direction;
A cylindrical holder made of a non-magnetic material has a third member in which n ₃ tooth-shaped members of the same shape made of a magnetic material are fixed at equal intervals in the circumferential direction;
The first member, the second member, and the third member are arranged to have the same central axis,
The second member is disposed inside the first member;
The tooth-shaped member of the third member is a magnetic gear device fixedly disposed between the second member and the first member,
A second transmission having a central axis identical to the central axis for converting the rotational speed of the second member is provided in a region inside the inner peripheral surface of the second yoke of the second member. A magnetic gear device characterized by comprising:   The magnetic gear device according to claim 1, wherein the second transmission device is a planetary gear mechanism.   The teeth of the outer peripheral gear of the planetary gear mechanism are formed on the inner peripheral surface of the second yoke, and the sun gear and the planetary gear of the planetary gear mechanism are exchangeable. The magnetic gear device described in 1.   4. The magnetic gear device according to claim 2, wherein the planetary gear mechanism is constituted by a non-contact gear.