Magnetic Pole Piece Device of Magnetic Gear, Magnetic Gear, and Manufacturing Method of Magnetic Pole Piece Device of Magnetic Gear

Abstract

The pole piece device of the magnetic gear includes: an outer peripheral cover member and an inner peripheral cover member, which are coaxially arranged on the outer side and the inner side in the radial direction respectively; a pole piece holder, which is partitioned by a wall member between the outer peripheral cover member and the inner peripheral cover member; and a pole piece, which is held by the pole piece holder. The inner ring member, the outer ring member and the wall member are integrally formed.

Description

Technical Field

[0001] The present invention relates to a pole piece device of a magnetic gear, a magnetic gear, and a method for manufacturing a pole piece device of a magnetic gear. Background Art

[0002] As a type of gear device, there is a magnetic gear as follows. It uses the attractive and repulsive forces of magnets to transmit torque and motion in a non-contact manner, thereby being able to avoid problems such as wear, vibration, and noise caused by tooth contact. The flux modulation type (higher harmonic type) magnetic gear in this magnetic gear includes an inner peripheral side excitation magnet, an outer peripheral side excitation magnet, and a pole piece device that are arranged concentrically (coaxially). The pole piece device is arranged between the two excitation magnets with a gap (air gap) provided therebetween, and has a plurality of pole pieces (pole pieces) and a plurality of non-magnetic bodies arranged alternately in the circumferential direction (refer to Patent Document 1). Moreover, the magnetic flux of the magnets of the two excitation magnets is modulated by the respective pole pieces to generate a higher harmonic magnetic flux, and the two excitation magnets are synchronized with the higher harmonic magnetic flux respectively, so that the flux modulation type magnetic gear operates.

[0003] For example, in a magnetic gear drive motor (geared motor) formed by integrating this flux modulation type magnetic gear with a motor, the outer peripheral side excitation magnet is fixed to function as a stator, and the inner peripheral side excitation magnet functions as a high-speed rotor, and the pole piece device functions as a low-speed rotor. Moreover, by rotating the high-speed rotor using the magnetomotive force of a coil, the low-speed rotor rotates according to the reduction ratio. It should be noted that as a magnetic gear drive motor, there are known types of magnetic gear drive motors having permanent magnets provided on the high-speed rotor and the stator, and types of magnetic gear drive motors having permanent magnets provided only on the high-speed rotor.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Specification of U.S. Patent No. 9,219,395 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In the above-mentioned Patent Document 1, in the pole piece device, rigid reinforcement is performed by providing rod-shaped reinforcing members extending in the axial direction on a plurality of pole pieces arranged along the circumferential direction. However, such a reinforcing member is provided to extend in the axial direction. For example, it is difficult to contribute to the rigidity against loads acting in the radial direction, such as electromagnetic forces and centrifugal loads acting between the excitation magnets. In the pole piece device, if there is not enough overall rigidity including loads in the axial direction and loads in the radial direction, deformation may occur in the radial direction, and interference may occur between the adjacent excitation magnets mentioned above.

[0009] At least one embodiment of the present invention has been completed in view of the above situation, and its object is to provide a pole piece device of a magnetic gear, a magnetic gear, and a manufacturing method of a pole piece device of a magnetic gear, which have excellent rigidity.

[0010] Means for solving the problem

[0011] To solve the above problem, the pole piece device of the magnetic gear according to at least one embodiment of the present invention includes:

[0012] An outer peripheral cover member and an inner peripheral cover member, which are coaxially arranged on the outer side and the inner side in the radial direction of the magnetic gear respectively, and each has a cylindrical shape;

[0013] A pole piece holder, which is formed by partitioning a cylindrical space formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member extending along the radial direction; and

[0014] A pole piece, which is held by the pole piece holder,

[0015] The inner side ring member, the outer side ring member and the wall member are integrally formed.

[0016] To solve the above problem, the magnetic gear according to at least one embodiment of the present invention includes:

[0017] The pole piece device of at least one embodiment of the present invention;

[0018] An inner diameter side excitation magnet, which is arranged at a position closer to the inner circumference than the pole piece device; and

[0019] An outer diameter side excitation magnet, which is arranged at a position closer to the outer circumference than the pole piece device.

[0020] To solve the above problem, the manufacturing method of the pole piece device of the magnetic gear according to at least one embodiment of the present invention is a method for manufacturing the pole piece device of the magnetic gear,

[0021] The pole piece device of the magnetic gear includes:

[0022] An outer peripheral cover member and an inner peripheral cover member, which are coaxially arranged on the outer side and the inner side in the radial direction of the magnetic gear respectively, and each has a cylindrical shape;

[0023] A pole piece holder, which is formed by partitioning a cylindrical space formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member extending along the radial direction; and

[0024] A pole piece, which is held by the pole piece holder,

[0025] The inner ring member, the outer ring member and the wall member are integrally formed,

[0026] Wherein,

[0027] The manufacturing method of the pole piece device of the magnetic gear includes the following steps:

[0028] Manufacturing a first intermediate formed product by integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member;

[0029] Inserting the pole piece into a recess formed between adjacent wall members in the first intermediate formed product to manufacture a second intermediate formed product; and

[0030] Installing and integrally forming the other of the outer peripheral cover member and the inner peripheral cover member with respect to the second intermediate formed product.

[0031] Advantages of the Invention

[0032] According to at least one embodiment of the present invention, there is provided a pole piece device of a magnetic gear, a magnetic gear and a manufacturing method of a pole piece device of a magnetic gear, which have excellent rigidity. Description of the Drawings

[0033] Figure 1 It is a cross-sectional view along the radial direction of a magnetic gear according to an embodiment of the present invention.

[0034] Figure 2 It is Figure 1 A partial enlarged view of the magnetic gear shown.

[0035] Figure 3 It is a cross-sectional view along the axial direction of a magnetic gear according to an embodiment of the present invention.

[0036] Figure 4A It is a schematic diagram of a cross-section along the radial direction of a pole piece device according to an embodiment of the present invention.

[0037] Figure 4B It is a diagram showing a comparison of the thermal conductivity and tensile elastic modulus of PAN-based CFRP and pitch-based CFRP with metals.

[0038] Figure 5 is Figure 4A a schematic diagram of an axial cross-section of the L-L line of

[0039] Figure 6 is a magnified and simplified cross-sectional schematic diagram showing the vicinity of the outer peripheral cover member and the inner peripheral cover member of Figure 5

[0040] Figure 7 is Figure 5 the first modification of

[0041] Figure 8 is Figure 7 an enlarged view of the range M of

[0042] Figure 9 is Figure 5 the second modification of

[0043] Figure 10 is Figure 9 a schematic diagram of an axial cross-section of the N-N line of

[0044] Figure 11 a flowchart briefly showing a manufacturing method of a pole piece device according to an embodiment of the present invention

[0045] Figure 12 is a flowchart showing Figure 11 an embodiment of a manufacturing method of

[0046] Figure 13A is a schematic diagram briefly showing Figure 12 the manufacturing process of the pole piece device in each process of

[0047] Figure 13B is a schematic diagram briefly showing Figure 12 the manufacturing process of the pole piece device in each process of

[0048] Figure 13C is a schematic diagram briefly showing Figure 12 the manufacturing process of the pole piece device in each process of

[0049] Figure 14 is a flowchart showing Figure 11 another embodiment of a manufacturing method of

[0050] Figure 15A is a schematic diagram briefly showing Figure 14 the manufacturing process of the pole piece device in each process of

[0051] Figure 15B is a schematic diagram briefly showing Figure 14Schematic diagrams of the manufacturing process of the pole piece device in each process.

[0052] Figure 15C Briefly shows Figure 14 Schematic diagrams of the manufacturing process of the pole piece device in each process.

[0053] Figure 16A An example of a perspective view showing a structural example of the core material.

[0054] Figure 16B Another example of a perspective view showing a structural example of the core material.

[0055] Figure 16C Another example of a perspective view showing a structural example of the core material.

[0056] Figure 17A Is Figure 16A A modified example.

[0057] Figure 17B Is Figure 16A Another modified example.

[0058] Figure 18 A perspective view showing a structural example of the pole piece held by the pole piece holder.

[0059] Figure 19 A schematic diagram showing the structure at the connection part between the solid member and the pole piece holder in the pole piece device.

[0060] Figure 20A Shows Figure 19 One of the installation examples of the solid member shown with respect to the outer cover member or the inner cover member. A schematic diagram.

[0061] Figure 20B Shows Figure 19 Another installation example of the solid member shown with respect to the outer cover member or the inner cover member. A schematic diagram.

[0062] Figure 21 A schematic diagram showing another installation example of the solid member.

[0063] Figure 22A An example of a longitudinal sectional view along the axial direction including the connection structure of the solid member and the rotor end plate.

[0064] Figure 22B Shows from the radially outer side Figure 22A The top view of the connection structure.

[0065] Figure 23A Another example of a longitudinal sectional view along the axial direction including the connection structure of the solid member and the rotor end plate.

[0066] Figure 23B is a top view showing the connection structure from the radially outer side Figure 23A of the connection structure

[0067] Figure 24A is another example of a longitudinal sectional view along the axial direction of a connection structure including a solid member and a rotor end plate

[0068] Figure 24B is a top view showing the connection structure from the radially outer side Figure 24A of the connection structure

[0069] Figure 25 is a perspective view showing another structural example of the core material

[0070] Figure 26 is showing Figure 25 a schematic diagram of the manufacturing process of the core material shown

[0071] Figure 27 is an example of a sectional view of the core material perpendicular to the axial direction

[0072] Figure 28 is Figure 27 a modified example

[0073] Figure 29 is Figure 27 another modified example

[0074] Figure 30 is Figure 27 another modified example

[0075] Figure 31A is Figure 6 a modified example

[0076] Figure 31B is Figure 6 another modified example

[0077] Figure 31C is Figure 6 another modified example

[0078] [[ID=

[66] ] Figure 31D is Figure 6 another modified example DETAILED DESCRIPTION

[0079] Hereinafter, several embodiments of the present invention will be described with reference to the drawings. Among them, the dimensions, materials, shapes, relative arrangements, etc. of the constituent components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples

[0080] For example, expressions indicating relative or absolute configurations such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only represent such configurations in the strict sense, but also represent states of relative displacement with tolerances, or angles and distances to the extent that the same function can be obtained.

[0081] For example, expressions indicating the state of equality of things such as "same", "equal", and "homogeneous" not only represent the state of strict equality, but also represent states with tolerances, or differences to the extent that the same function can be obtained.

[0082] For example, expressions indicating shapes such as a quadrilateral shape and a cylindrical shape not only represent shapes such as a quadrilateral shape and a cylindrical shape in the strict geometric sense, but also represent shapes including concavo-convex portions, chamfered portions, etc. within the range where the same effect can be obtained.

[0083] On the other hand, expressions such as "comprising", "containing", "equipped with", "including", or "having" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0084] (Structure of magnetic gear 9)

[0085] Figure 1 It is a schematic view of a cross-section of the magnetic gear 9 along the radial direction c of an embodiment of the present invention. Figure 2 is Figure 1 A partial enlarged view of the cross-section of the magnetic gear 9 shown. Figure 3 It is a schematic view of a cross-section of the magnetic gear 9 along the axial direction b of an embodiment of the present invention.

[0086] The magnetic gear 9 is a device having a mechanism that transmits torque in a non-contact manner using the attractive and repulsive forces generated by magnets. Figures 1 - 3 The magnetic gear 9 shown is a flux modulation type (higher harmonic type). As shown in the figure, it has the following structure: an outer diameter side excitation magnet 5 (outer rotor) having a cylindrical (ring-shaped. The same applies hereinafter) shape as a whole, an inner diameter side excitation magnet 7 (inner rotor) having a cylindrical or columnar shape as a whole, and a pole piece device 1 having a cylindrical shape as a whole are coaxially arranged with a certain distance gap G (air gap) in the radial direction c (radius direction) from each other. That is, the outer diameter side excitation magnet 5 is arranged on the radially outer side (outer diameter side) with respect to the inner diameter side excitation magnet 7. In addition, the pole piece device 1 is arranged between the outer diameter side excitation magnet 5 and the inner diameter side excitation magnet 7. Moreover, these outer diameter side excitation magnet 5, inner diameter side excitation magnet 7, and pole piece device 1 are arranged concentrically.

[0087] In addition, as Figure 2As shown, the above-described outer-diameter-side exciting magnet 5 and inner-diameter-side exciting magnet 7 each have a permanent magnet or the like magnetic pole pair (51, 71) formed by a plurality of N poles and S poles arranged at intervals (equally spaced) in the circumferential direction in a cross-section (hereinafter referred to as a radial cross-section) cut along the radial direction c of the magnetic gear 9. Specifically, the outer-diameter-side exciting magnet 5 has a plurality of magnetic pole pairs 51 and a support member 52 that supports the plurality of magnetic pole pairs 51. Moreover, on the cylindrical inner circumferential surface of the outer-diameter-side exciting magnet 5, the plurality of magnetic pole pairs 51 are provided over the entire circumference thereof in a state facing the radial direction c and with the N poles and S poles alternating with each other in the circumferential direction. Similarly, the above-described inner-diameter-side exciting magnet 7 has a plurality of inner-diameter magnetic pole pairs 71 and a cylindrical inner-diameter support member 72 that supports the plurality of inner-diameter magnetic pole pairs 71. Moreover, on the cylindrical outer circumferential surface of the inner-diameter-side exciting magnet 7, the plurality of inner-diameter magnetic pole pairs 71 are provided over the entire circumference thereof in the circumferential direction a in the same manner as described above.

[0088] The pole piece device 1 has a plurality of pole pieces 41 (pole pieces) arranged at intervals (equally spaced) from each other over the entire circumference in the circumferential direction a, and its detailed structure will be described later. Moreover, for example, when the inner-diameter-side exciting magnet 7 is rotated, the magnetic flux of the inner-diameter-side exciting magnet 7 is modulated by the pole pieces 41 of the pole piece device 1, and a rotational torque is generated in the pole piece device 1 by the action of the modulated magnetic field and the outer-diameter-side exciting magnet 5.

[0089] In Figures 1 - 3 the embodiment shown, the magnetic gear 9 (flux modulation type magnetic gear) is integrated with a motor to form a magnetic gear drive motor. More specifically, in this magnetic gear drive motor, the outer-diameter-side exciting magnet 5 is a stator provided with a plurality of coils 6 (refer to Figure 2 ), and by using the magnetomotive force of the coils 6 to rotate the inner-diameter-side exciting magnet 7 (high-speed rotor), the pole piece device 1 (low-speed rotor) rotates at a reduction ratio determined by the ratio of the number of pole pairs of the magnetic pole pairs 51 of the outer-diameter-side exciting magnet 5 to the number of pole pairs of the inner-diameter magnetic pole pairs 71 of the inner-diameter-side exciting magnet 7.

[0090] In addition, in order to protect the above-described components from the heat generated during operation, a cooling medium D such as air or water is supplied to the magnetic gear drive motor. Specifically, as Figure 3 shown, cylindrical gaps G are respectively formed between the inner-diameter-side exciting magnet 7 and the pole piece device 1 and between the outer-diameter-side exciting magnet 5 and the pole piece device 1, and it is configured to supply the cooling medium D to these cylindrical gaps G in a manner flowing from one end side to the other end side. In addition, the cooling medium D is similarly supplied to the gap formed between the outer-diameter-side exciting magnet 5 and the housing H located on its outer peripheral side.

[0091] It should be noted that gas such as air can be supplied to the gap between the outer diameter side exciting magnet 5 and the housing H, or a water cooling pipe can be provided, for example, and cooling water or the like can flow through the water cooling pipe.

[0092] In the magnetic gear 9 (flux modulation type magnetic gear) having the above structure, the above-mentioned pole piece device 1 bears loads acting along the radial direction, such as electromagnetic forces and centrifugal loads acting between the two adjacent exciting magnets (5, 7) on the inner peripheral side and the outer peripheral side. Therefore, if there is not enough rigidity, deformation may occur in the radial direction c, and interference may occur between the pole pairs (51, 71) of the adjacent exciting magnets in the radial direction c. For this reason, the above-mentioned pole piece device 1 is configured as follows.

[0093] It should be noted that the magnetic gear 9 has been described by taking the case where it is a magnetic gear drive motor as an example, but the magnetic gear 9 can also operate as a magnetic gear drive generator. In this case, with the rotation of the inner diameter side exciting magnet 7 (inner rotor), the pole piece device 1 (central rotor) rotates. The operation of the pole piece device 1 is different in the case of a magnetic gear drive motor and a magnetic gear drive generator, but the structure of the device is the same.

[0094] (Structure of the pole piece device 1)

[0095] Hereinafter, the pole piece device 1 will be described in detail. Figure 4A It is a schematic view of a cross-section along the radial direction c of the pole piece device 1 according to an embodiment of the present invention. Figure 4B It is a diagram showing a comparison of the thermal conductivity and tensile elastic modulus of PAN-based CFRP and pitch-based CFRP with metals (copper, aluminum, iron). Figure 5 It is Figure 4A A schematic view of a cross-section along the axial direction b of the L-L line of

[0096] As described above, the pole piece device 1 is a device (component) constituting the magnetic gear 9, and is a device (component) disposed between the inner diameter side exciting magnet 7 (high-speed rotor in the case of a magnetic gear drive motor) and the outer diameter side exciting magnet 5 (stator in the case of a magnetic gear drive motor) in the magnetic gear 9, and the magnetic gear 9 is a flux modulation type magnetic gear constituting, for example, a magnetic gear drive motor.

[0097] The pole piece device 1 includes an outer peripheral cover member 2 disposed opposite to the inner peripheral surface of the outer diameter side exciting magnet 5, and an inner peripheral cover member 3 disposed opposite to the outer peripheral surface of the inner diameter side exciting magnet 7. The outer peripheral cover member 2 and the inner peripheral cover member 3 are each a member having a cylindrical shape as a whole. In addition, the inner peripheral cover member 3 has a smaller diameter than the outer peripheral cover member 2 and is coaxially disposed inside the outer peripheral cover member 2.

[0098] A cylindrical space 8 is formed over the entire circumference between the inner circumferential surface of the outer circumferential cover member 2 and the outer circumferential surface of the inner circumferential cover member 3 (in other words, the outer circumferential cover member 2 and the inner circumferential cover member 3 are arranged with the cylindrical space 8 therebetween). In the cylindrical space 8, a plurality of pole piece holders 10 are provided by being partitioned by wall members 20 extending along the radial direction c. The plurality of pole piece holders 10 are arranged at a predetermined interval (for example, an equal interval) in the circumferential direction. Long strip-shaped pole pieces 41 (pole pieces) are respectively inserted into the respective pole piece holders 10 with their longitudinal directions along the axial direction b.

[0099] The wall members 20 constituting the pole piece holders 10 are integrally formed with the outer circumferential cover member 2 and the inner circumferential cover member 3. By connecting the outer circumferential cover member 2 and the inner circumferential cover member 3 to each other using the wall members 20 extending along the radial direction c in this way, the rigidity of the pole piece device 1 can be effectively improved. For example, when the magnetic gear 9 transmits power, the rigidity against the flexural deformation and torsional deformation generated in the pole piece device 1 due to the radial loads such as electromagnetic force and centrifugal force received from the outer diameter side excitation magnet 5 or the inner diameter side excitation magnet 7 can be effectively improved. As a result, when the magnetic gear 9 transmits power, the risk that the pole piece device 1 contacts the outer diameter side excitation magnet 5 and the inner diameter side excitation magnet 7 arranged with a gap G therebetween due to deformation can be effectively avoided.

[0100] In addition, the outer circumferential cover member 2, the inner circumferential cover member 3, and the wall members 20 integrally formed are integrally formed of, for example, carbon fiber reinforced plastic (CFRP: Carbon Fiber Reinforced Plastic). Carbon fiber reinforced plastic is a lightweight material with excellent strength reliability. By using this lightweight material, excellent rigidity can be ensured while suppressing an increase in the weight of the pole piece device 1.

[0101] When the outer circumferential cover member 2, the inner circumferential cover member 3, and the wall members 20 are made of carbon fiber reinforced plastic, they may be constituted by combining pitch-based CFRP and PAN-based CFRP according to their uses. For example, the wall members 20 may also be configured to include pitch-based CFRP. Since pitch-based CFRP has excellent thermal conductivity compared to PAN-based CFRP, by forming the wall members 20 adjacent to the pole pieces 41 that generate heat during operation with pitch-based CFRP and orienting their fiber directions in the radial direction, the heat dissipation function of the pole pieces 41 can be effectively improved.

[0102] In addition, when the outer peripheral cover member 2 and the inner peripheral cover member 3 are also configured to include pitch-based CFRP, heat generated from the pole piece 41 can be thermally conducted to the outer and inner peripheral cover members (2, 3) via the wall member 20, and heat dissipation and cooling can be efficiently performed from the air gaps G provided on the outer and inner peripheries of the pole piece device 1. It should be noted that by orienting the fiber orientation of the outer peripheral cover member 2 and the inner peripheral cover member 3 in the circumferential direction thereof, the rigidity of the pole piece device 1 against the electromagnetic force and centrifugal force acting on the pole piece 41 can be efficiently improved. In addition, the fiber orientation of the outer peripheral cover member 2 and the inner peripheral cover member 3 may also be combined with a fiber orientation that intersects the circumferential direction, such as ±45° with respect to the circumferential direction and the axial direction. By a fiber orientation that intersects the circumferential direction such as ±45° with respect to the axial direction, the torsional rigidity of the pole piece device 1 can be efficiently improved. In this way, since pitch-based CFRP has higher elasticity than PAN-based CFRP, it is possible to efficiently suppress the flexure and torsional deformation of the pole piece device 1 itself caused by the centrifugal load acting on the pole piece 41 and the torque load acting on the pole piece device 1.

[0103] It should be noted that, for the carbon fiber of the CFRP used in the outer peripheral cover member 2, the inner peripheral cover member 3, and the wall member 20, fibers having an elastic modulus of 400 GPa, preferably 700 GPa or more can be used. Generally, the higher the elastic modulus of carbon fiber, the more excellent the thermal conductivity. When the elastic modulus is approximately 400 GPa, the thermal conductivity is twice that of iron, and when the elastic modulus is 700 GPa or more, the thermal conductivity is four times that of iron, reaching the same level as aluminum. Therefore, by using carbon fibers having the above elastic modulus, the cooling performance and high rigidity of the pole piece device 1 can be balanced at a higher level. On the other hand, as Figure 4B shown, PAN-based CFRP has higher strength than pitch-based CFRP. Therefore, according to the strength required for the pole piece device 1, PAN-based CFRP can also be used for each member included in the pole piece device 1.

[0104] As Figure 5 shown, a rotor end plate 11 for outputting the power transmitted to the pole piece device 1 is fixed to the end portion in the axial direction b of the pole piece device 1. A solid member 12 is provided near the end portion in the axial direction b in the cylindrical space 8. The solid member 12 is made of an insulating material such as the above-mentioned carbon fiber reinforced plastic or glass fiber reinforced plastic (GFRP: Grass Fiber Reinforced Plastic), and is configured to fill the space surrounded by the inner peripheral surface of the outer peripheral cover member 2, the outer peripheral surface of the inner peripheral cover member 3, and the end surface of the rotor end plate 11 (in other words, the solid member 12 is configured to be in contact with the inner peripheral surface of the outer peripheral cover member 2, the outer peripheral surface of the inner peripheral cover member 3, and the end surface of the rotor end plate 11, respectively).

[0105] The connecting member 13 is embedded in the solid member 12. The connecting member 13 is, for example, a T-bolt that has threads cut at its three ends and connects the outer peripheral cover member 2, the inner peripheral cover member 3, and the rotor end plate 11 to each other by fastening, thereby firmly fixing the pole pieces 41 held by the pole piece holder 10 and enabling good rigidity with a stable structure.

[0106] As described above, the plurality of pole piece holders 10 are arranged at regular intervals from each other along the circumferential direction a in the cylindrical space 8. An adjacent space 14 defined by a pair of wall members 20 is provided between adjacent pole piece holders 10 in the cylindrical space 8. In Figures 5 - 6 the illustrated embodiment, the adjacent space 14 is filled by disposing the core material 15. The core material 15 is configured to include, for example, a lightweight non-magnetic body such as a honeycomb structure composed of a high molecular rigid foam such as polyurethane, polyetherimide, polyimide, or polymethacrylimide, a high molecular material monomer, or a composite material of a high molecular material and pulp fibers, aramid fibers, glass fibers, carbon fibers, etc. By filling the adjacent space 14 with the core material 15 like this, even when the thin-walled members such as the outer peripheral cover member 2 and the inner peripheral cover member 3 constituting the pole piece device 1 are thinned, the rigidity of the pole piece device 1 can be more effectively improved.

[0107] The outer peripheral cover member 2 and the inner peripheral cover member 3 integrally formed with the wall member 20 may also be made of carbon fiber reinforced plastics having a plurality of layers with different fiber directions from each other. Figure 6 is a schematic cross-sectional view showing an enlarged and simplified view of the vicinity of the Figure 5 outer peripheral cover member 2 and the inner peripheral cover member 3.

[0108] In Figure 6 the illustrated example, the outer peripheral cover member 2 is configured to include a first layer 2a with a fiber direction in the first direction and a second layer 2b with a fiber direction in the second direction. The inner peripheral cover member 3 is configured to include a first layer 3a with a fiber direction in the first direction and a second layer 3b with a fiber direction in the second direction. The first direction is a direction parallel to the circumferential direction a, and the second direction is a direction intersecting the circumferential direction a in the plane formed by the circumferential direction a and the axial direction b, for example, a direction at ±45 degrees with respect to the axial direction b. In addition, the wall member 20 is a carbon fiber reinforced plastic whose fiber direction is composed of a third direction or a fourth direction. The third direction is a direction parallel to the radial direction c, and the fourth direction is a direction intersecting the radial direction in the plane formed by the axial direction b and the radial direction c, for example, a direction at ±45 degrees with respect to the axial direction b.

[0109] By having the outer peripheral cover member 2 and the inner peripheral cover member 3 have a hybrid structure combining a plurality of mutually different layers like this, when the magnetic gear 9 transmits power, it is possible to effectively improve the rigidity against flexural deformation generated in the pole piece device 1 due to the load received from the outer diameter side exciting magnet 5 or the inner diameter side exciting magnet 7, and the rigidity against torsional deformation regarding torque transmission. In particular, a centrifugal force along the radial direction c caused by rotation acts on the pole piece device 1. Therefore, by disposing the first layer (2a, 3b) having a fiber direction in the first direction along the circumferential direction a, the centrifugal force in the radial direction c can be borne by the high-rigidity and high-strength continuous carbon fibers as a circumferential load, and the flexural deformation of the pole piece device 1 caused by the centrifugal force can be effectively suppressed. On the other hand, the pole piece device 1 needs to transmit the torque load from one end plate to the other end plate. Therefore, by disposing the second layer (2b, 3b) having a fiber direction in the second direction crossing the circumferential direction a, the rigidity against torsion can be effectively improved.

[0110] It should be noted that, in Figure 6 the example, the first layer 2a of the outer peripheral cover member 2 is disposed at a position closer to the inner peripheral side than the second layer 2b, but the first layer 2a may also be disposed at a position closer to the outer peripheral side than the second layer 2b. Similarly, the first layer 3a of the inner peripheral cover member 3 is disposed at a position closer to the outer peripheral side than the second layer 3b, but the first layer 3a may also be disposed at a position closer to the inner peripheral side than the second layer 3b. In addition, in Figure 6 the example, a case where both the outer peripheral cover member 2 and the inner peripheral cover member 3 are composed of a plurality of layers (2a, 2b, 3a, 3b) is shown, but only either the outer peripheral cover member 2 or the inner peripheral cover member 3 may be composed of a plurality of layers.

[0111] Figure 7 is Figure 5 the first modification, Figure 8 is Figure 7 an enlarged view of the range M of Figure 8 In the first modification, as Figure 7 shown, the pole piece 41 held by the pole piece holder 10 is configured to include a plurality of pole piece plates 41a laminated along the axial direction b. Each of the plurality of pole piece plates 41a has holes 43 provided at corresponding positions, and a fastening rod 44 extending along the axial direction b is inserted into the holes 43. As shown, the end portion of the fastening rod 44 is fastened to the above-mentioned solid member 12. Thus, the plurality of pole piece plates 41a constituting the pole piece 41 are fixed to the rotor end plate 11 via the solid member 12 together with the outer peripheral cover member 2 and the inner peripheral cover member 3 by the fastening rod 44. By adopting such a structure, the torsional rigidity of the pole piece device 1 can be more effectively improved, the shear stress acting on the fastening portion bolts 13 and 14 can be effectively reduced, and a larger torque can be transmitted.

[0112] Figure 9 is Figure 5 a second modified example of Figure 10 is Figure 9 a schematic view of a cross-section along the axial direction b of the N - N line of Figure 5 . In the second modified example, the above-mentioned adjacent space 14 defined by a pair of wall members 20 between adjacent pole piece holders 10 in the cylindrical space 8 is configured as a hollow space (hollow core) (in other words, the core material 15 is not filled in the adjacent space 14 as in

[0113] such as Figure 10 shown). Moreover, cooling holes 17 communicating with the outside are provided in both the outer peripheral cover member 2 and the inner peripheral cover member 3 surrounding the adjacent space 14. Figure 3 As shown in

[0114] the cooling holes 17 are provided in both the outer peripheral cover member 2 and the inner peripheral cover member 3. Thus, the cooling medium D flowing in the gap G (refer to

[0115] (Method for manufacturing the pole piece device 1)

[0116] Next, a method for manufacturing the pole piece device 1 having the above structure will be described. Figure 11 is a flowchart briefly showing a method for manufacturing the pole piece device 1 according to an embodiment of the present invention.

[0117] In this manufacturing method, first, a first intermediate formed product 54, 54' (refer to Figure 13A or Figure 15A described later) is manufactured by integrally forming one of the outer peripheral cover member 2 and the inner peripheral cover member 3 constituting the pole piece device 1 with the wall member 20 (step S1). Then, the second intermediate formed product 55, 55' is manufactured by inserting the pole piece 41 into the first intermediate formed product 54, 54' (step S2). Then, the pole piece device 1 is completed by installing the other of the outer peripheral cover member 2 and the inner peripheral cover member 3 with respect to the second intermediate formed product 55, 55' and integrally forming the two (step S3).

[0118] First, for Figure 11The case where the first intermediate formed article 54 in step S1 is manufactured by integrally forming the outer peripheral cover member 2 and the wall member 20 will be described (in other words, the case of manufacturing the pole piece device 1 from the outer peripheral side will be described). Figure 12 is a flowchart showing Figure 11 an embodiment of the manufacturing method. Figures 13A - 13C is a schematic diagram briefly showing Figure 12 the manufacturing process of the pole piece device 1 in each process.

[0119] First. Prepare a forming die 50 corresponding to the first intermediate formed article 54 (step S100). That is, as Figure 13A shown, the surface shape of the radially outer side of the forming die 50 is configured to match the surface shape of the radially inner side of the first intermediate formed article 54. Specifically, on the surface of the radially outer side of the forming die 50, a plurality of convex portions 50a are provided along the circumferential direction a in a manner corresponding to the surface shape of the radially inner side of the first intermediate formed article 54 described later.

[0120] It should be noted that in the forming die 50, a heater 59 that can operate during a subsequent heat treatment is built in. The heater 59 includes, for example, a plurality of heating wires arranged along the radial direction a.

[0121] Next, the constituent material of the first intermediate formed article 54 is laid on the forming die 50 prepared in step S100 (step S101). The constituent material laid in step S101 is, for example, a prepreg obtained by impregnating a heat-curable resin in the above-mentioned carbon fiber reinforced plastic or the like in a fiber base material. Specifically, the first constituent material 60 corresponding to the wall member 20 is laid along the surface of the radially outer side of the forming die 50. Then, a non-magnetic material 62 corresponding to the core material 15 is inserted into the concave portion 61 on the surface of the radially outer side of the first constituent material 60 (in the case of being configured as a hollow core without filling the core material 15 into the adjacent space 14 as shown in Figure 9 shown, a material that can be subjected to a dissolution treatment later can be used as the non-magnetic material 62). Then, with respect to the first constituent material 60 into which the non-magnetic material 62 is inserted, the second constituent material 63 corresponding to the outer peripheral cover member 2 is laid from the radially outer side.

[0122] Next, the radially outer peripheral side of the constituent material laid on the forming die 50 is covered with a vacuum bag 49 (step S102), and further, a rubber heater 53 is provided on the radially outer peripheral side of the vacuum bag 49 (step S103). In such a state, by operating the heater 59 and the rubber heater 53 built in the forming die 50, the constituent material laid on the forming die 50 is heated to perform a curing process (step S104). Thus, the first intermediate formed body 54 in which the outer peripheral cover member 2 and the pole piece holder 10 are integrally formed (co-cure integrally formed) is completed (step S105). By integrally forming the wall surface of the pole piece holder 10 and the outer peripheral cover member 2 using the forming die 50 in this way, the shape accuracy is improved. Accordingly, when the pole piece 41 is inserted into the pole piece holder 10, there is no need for an operation of finely adjusting the pole piece holder 10 by additional processing.

[0123] Next, as Figure 13B shown, the pole piece 41 is inserted into the recess corresponding to the pole piece holder 10 in the first intermediate formed body 54 taken out from the forming die 50 (step S106), and the second intermediate formed body 55 is manufactured (step S107).

[0124] It should be noted that when the same material as that of the outer peripheral cover member 2 and the wall member 20 is used for the pole piece 41, the pole piece 41 inserted in step S106 may also be integrally formed with the outer peripheral cover member 2 and the wall member 20 in steps S101 to S105. That is, the second intermediate formed body 55 is manufactured by integrally forming the outer peripheral cover member 2, the wall member 20 constituting the pole piece holder 10, and the pole piece 41 inserted into the pole piece holder 10 when integrally forming the first intermediate formed body 54. In this case, in addition to the outer peripheral cover member 2 and the wall member 20, the pole piece 41 is also integrally formed, so that the pole piece device 1 can be manufactured more simply.

[0125] Next, as Figure 13CAs shown, a constituent material 64 equivalent to the inner peripheral cover member 3 is laid on the surface on the radially inner peripheral side of the second intermediate formed body 55 (step S108). The constituent material 64 laid in step S108 is the same as the constituent material laid in step S101. For example, a prepreg obtained by impregnating a heat-curable resin into the above-mentioned carbon fiber reinforced plastic or the like in a fiber base material is used. Then, a portion of the constituent material laid in step S108 on the more radially inner peripheral side is covered with a vacuum bag 56 (step S109), and further, a rubber heater 57 is provided on the inner peripheral side of the vacuum bag 56 (step S110). In such a state, the rubber heater 57 arranged in step S110 is operated to perform heating, thereby performing a curing process (step S111). Thus, the inner peripheral cover member 3 is further integrally formed with respect to the second intermediate formed body 55, and the pole piece device 1 is completed. By integrally forming the inner peripheral cover member 3 further with the second intermediate formed body 55 in which the pole piece 41 is inserted in the first intermediate formed body 54 in this way as a substantially new forming die, the shape accuracy of the inner peripheral cover member 3 is also improved, and unnecessary processing and bonding processes are not required, and productivity improvement and cost reduction can be achieved.

[0126] It should be noted that in step S108, co-bond forming may also be performed by laying the constituent material 64 equivalent to the inner peripheral cover member 3 in such a manner that an adhesive is interposed between the second intermediate formed body 55.

[0127] Next, Figure 11 the case where the first intermediate formed body 54 in step S1 of the manufacturing is performed by integrally forming the inner peripheral cover member 3 and the wall member 20 will be described (in other words, the case where the pole piece device 1 is manufactured from the inner peripheral side will be described). Figure 14 is a flowchart showing Figure 11 another embodiment of the manufacturing method. Figures 15A - 15C Briefly shows Figure 14 a schematic view of the manufacturing process of the pole piece device 1 in each process.

[0128] First, a forming die 50' corresponding to the first intermediate formed body 54' is prepared (step S200). That is, as Figure 15A shown, the surface shape on the radially inner side of the forming die 50' is configured to match the surface shape on the radially outer side of the first intermediate formed body 54'. Specifically, on the surface on the radially inner side of the forming die 50', a plurality of convex portions 50a' are provided along the circumferential direction a in a manner corresponding to the surface shape on the radially outer side of the first intermediate formed body 54' to be described later.

[0129] It should be noted that a heater 59' that can operate during subsequent heat treatment is built into the forming die 50'. The heater 59' includes, for example, a plurality of heating wires arranged along the radial direction a.

[0130] Next, the constituent material of the first intermediate formed object 54' is laid on the forming die 50' prepared in step S200 (step S201). The constituent material laid in step S201 is, for example, a prepreg obtained by impregnating a heat-curable resin into the above-mentioned carbon fiber reinforced plastic or the like in a fiber base material. Specifically, the first constituent material 60' corresponding to the wall member 20 is laid along the inner surface in the radial direction of the forming die 50'. Then, a non-magnetic material 62' corresponding to the core material 15 is inserted into the recess 61' on the outer surface in the radial direction of the first constituent material 60' (when the core material 15 is not filled into the adjacent space 14 as shown in Figure 9 and is configured as a hollow core, a material that can be dissolved after use can be used as the non-magnetic material 62'). Then, the second constituent material 63' corresponding to the outer peripheral cover member 2 is laid from the radial inside with respect to the first constituent material 60' into which the non-magnetic material 62' is inserted.

[0131] Next, the inner side in the radial direction of the constituent material laid on the forming die 50' is covered with a vacuum bag 49' (step S202), and further a rubber heater 53' is provided inside the vacuum bag 49' in the radial direction (step S203). In such a state, by operating the heater 59' built into the forming die 50' and the rubber heater 53', the constituent material laid on the forming die 50' is heated and cured (step S204). Thus, the first intermediate formed object 54' in which the inner peripheral cover member 3 and the pole piece holder 10 are integrally formed (co-cured and integrally formed) is completed (step S205). By integrally forming the wall surface of the pole piece holder 10 and the inner peripheral cover member 3 using the forming die 50' in this way, the shape accuracy is improved. Therefore, when the pole piece 41 is inserted into the pole piece holder 10, there is no need to perform a fine adjustment operation on the pole piece holder 10 by additional processing.

[0132] Next, as shown in Figure 15B , the pole piece 410 is inserted into the recess corresponding to the pole piece holder 10 in the first intermediate formed object 54' taken out from the forming die 50' (step S206), and the second intermediate formed object 55' is manufactured (step S207).

[0133] Note that, when the magnetic pole piece 41 is made of the same material as the inner peripheral cover member 3 and the wall member 20, the magnetic pole piece 41 inserted in step S206 may also be integrally formed with the inner peripheral cover member 3 and the wall member 20 in steps S201 to S205. That is, the second intermediate formed article 55 is manufactured by integrally forming the inner peripheral cover member 3, the wall member 20 constituting the magnetic pole piece holder 10, and the magnetic pole piece 41 inserted into the magnetic pole piece holder 10 when integrally forming the first intermediate formed article 54. In this case, in addition to the inner peripheral cover member 3 and the wall member 20, the magnetic pole piece 41 is also integrally formed, so that the magnetic pole piece device 1 can be manufactured more simply.

[0134] Next, as Figure 15C shown, a constituent material 64' corresponding to the outer peripheral cover member 2 is laid on the radially outer surface of the second intermediate formed article 55' (step S208). The constituent material 64' laid in step S208 is the same as the constituent material laid in step S201, and for example, a prepreg obtained by impregnating a heat-curable resin into the above-mentioned carbon fiber reinforced plastic or the like in a fiber base material is used. Then, a radially outer portion of the constituent material laid in step S208 is covered with a vacuum bag 56' (step S209), and further, a rubber heater 57' is provided on the outer peripheral side of the vacuum bag 56' (step S210). In such a state, heating is performed by operating the rubber heater 57' arranged in step S210, and thus a curing process is performed (step S211). Thereby, the outer peripheral cover member 2 is further integrally formed with respect to the second intermediate formed article 55', and the magnetic pole piece device 1 is completed. By integrally forming the outer peripheral cover member 2 with the second intermediate formed article 55' in which the magnetic pole piece 41 is inserted in the first intermediate formed article 54' as a substantially new forming die in this way, the shape accuracy of the outer peripheral cover member 2 is also improved, and unnecessary processing and bonding steps are not required, so that productivity improvement and cost reduction can be achieved.

[0135] Note that, in step S208, co-bonding forming may also be performed by laying a constituent material 64' corresponding to the outer peripheral cover member 2 in such a manner that an adhesive is interposed between the second intermediate formed article 55'.

[0136] As described above, according to the above-described respective embodiments, it is possible to provide the magnetic pole piece device 1 having the magnetic gear 9 with high rigidity, the magnetic gear 9, and a manufacturing method of the magnetic pole piece device 1 of the magnetic gear 9.

[0137] Next, several structural examples of the core material 15 filled in the adjacent space 14 in the magnetic pole piece holder 10 included in the magnetic pole piece device 1 will be described. Figures 16A - 16C is a perspective view showing a structural example of the core material 15.

[0138] InFigures 16A - 16C In this case, the core material 15 is configured to include a core main body 15a and a first cover member 15b that at least partially surrounds the core main body 15a. The first cover member 15b is provided so as to at least partially surround the core main body 15a extending along the axial direction. In Figures 16A - 16C this case, the first cover member 15b is a single long member that is wound around the core main body 15a over the entire circumference.

[0139] In Figure 16A the illustrated embodiment, the core main body 15a is configured as a solid foam core. The foam core is a lightweight non-magnetic body as described above, and is, for example, a honeycomb structure composed of a high molecular rigid foam such as polyurethane, polyetherimide, polyimide, or polymethacrylimide, a high molecular material monomer, or a composite material of a high molecular material and pulp fibers, aramid fibers, glass fibers, carbon fibers, or the like.

[0140] The first cover member 15b is made of a fiber-reinforced resin, such as carbon fiber reinforced plastic (CFRP: Carbon Fiber Reinforced Plastic), glass fiber reinforced plastic (GFRP: Glass Fiber Reinforced Plastic), aramid fiber reinforced plastic (AFRP: Aramid Fiber Reinforced Plastics), basalt fiber reinforced plastic (BFRP: Basalt Fiber Reinforced Plastics), boron fiber reinforced plastic (BFRP: Boron Fiber Reinforced Plastics), Kevlar fiber reinforced plastic (KFRP: Kevlar Fiber Reinforced Plastics), Vectran fiber reinforced plastic (VFRP: Vectran Fiber Reinforced Plastics), or the like.

[0141] In the manufacturing process of such a core material 15, when the first cover member 15b is made of a fiber-reinforced plastic, a prepreg obtained by impregnating a fiber base material with a thermosetting resin is pre-mounted on the outer peripheral cover member 2 and the inner peripheral cover member 3 in a state of being disposed around the core member 15a, and is cured simultaneously with the outer peripheral cover member 2 and the inner peripheral cover member 3. Thus, the first cover member 15b can be integrally formed with the outer peripheral cover member 2 and the inner peripheral cover member 3. As a result, good structural strength can be obtained. In particular, axial rigidity and torsional rigidity against torque transmission can be maintained, and weight reduction and improvement in workability during manufacturing can be expected.

[0142] It should be noted that in another embodiment, it is also possible to, as Figure 17AThe first cover member 15b is configured as shown: the first cover member 15b is divided with respect to each surface of the core body 15a having a substantially quadrilateral cross-sectional shape in a cross-section perpendicular to the axial direction and adhered to each surface. In addition, in another embodiment, it may also be as Figure 17B shown: in a cross-section perpendicular to the axial direction, two cover members 15b1 and 15b2 having a substantially U-shaped configuration are joined together so as to cover the core body 15a from both sides. In this case, as Figure 17B shown, the portion where the cover member 15b1 and the cover member 15b2 are joined may also be set as the outer joining portion 16a provided on the side of the first cover member 15b facing the outer cover member 2 and the inner joining portion 16b provided on the side facing the inner cover member 3. In this case, the continuity of the load transfer from the first cover member 15b to the outer cover member 2 or the inner cover member 3 is not impaired. In addition, in the first cover member 15b, by avoiding the overlap on the side of the outer cover member 2 or the inner cover member 3, it is possible to avoid the peeling of the treatment while expecting an improvement in the surface roughness of the cured outer cylinder.

[0143] In Figure 16B the shown embodiment, the core body 15a is configured as a solid member made of a fiber-reinforced plastic. By configuring the core body 15a with a fiber-reinforced plastic in this way, the core body 15a itself can have axial rigidity and torsional rigidity for torque transmission through the stacking orientation. For the fiber-reinforced plastic, for example, fibers such as Pitch-based, PAN-based carbon fibers, glass fibers, and polymer fibers can be used, and resins such as epoxy, polyester, phenolic, bismaleimide, and polyurethane thermosetting resins, and thermoplastic resins such as polyimide, PP, polyethylene, polyvinyl chloride, polystyrene, polyetherimide, and nylon can be used.

[0144] In Figure 16B the shown embodiment, the first cover member 15b may also be configured as a resin sheet including a film-like adhesive, for example. The core body 15a made of a fiber-reinforced plastic is formed by machining a laminated plate, for example, but by forming the first cover member 15b with a resin sheet, the shape of the machined core body 15a can be appropriately adapted to the outer cover member 2 and the inner cover member 3, and an integrated structure with good rigidity can be achieved.

[0145] In Figure 16C the shown embodiment, the core body 15a and Figure 16BThe illustrated embodiment is also made of fiber-reinforced plastic, but has a hollow structure with a hollow portion 15a1 axially opened on the inner side. By adopting such a core body 15a with a hollow structure, the weight of the pole piece device can be reduced. In addition, by introducing a cooling medium into the hollow portion 15a1, the cooling performance of the pole piece device 1 can also be improved.

[0146] Such a hollow portion 15a1 can be easily formed, for example, by arranging a fiber-reinforced resin prepreg around a core material having a shape corresponding to the hollow portion 15a1 and then removing the core material after curing.

[0147] It should be noted that in this embodiment, the case where the cross-sectional shape of the hollow portion 15a1 is substantially rectangular is illustrated, but the cross-sectional shape of the hollow portion 15a can also be any shape such as a circle or a polygon. In addition, in this embodiment, the case where the core body 15a has one hollow portion 15a1 is illustrated, but it can also have a plurality of hollow portions 15a1.

[0148] Next, a structural example of the pole piece 41 held by the pole piece holder 10 will be described. Figure 18 It is a perspective view showing a structural example of the pole piece 41 held by the pole piece holder 10.

[0149] In Figure 18 the illustrated embodiment, the pole piece 41 is configured to include a pole piece main body 41a and a second cover member 41b that at least partially surrounds the pole piece main body 41a. In a cross-section orthogonal to the axial direction, the second cover member 41b can be arranged to partially surround the pole piece main body 41a or to surround the entire circumference of the pole piece main body 41a.

[0150] The second cover member 41b is, for example, a film-like adhesive such as epoxy resin, a fiber-reinforced resin prepreg such as KFRP, or a combination thereof. Thus, by sandwiching the second cover member 41b between the h pole piece main body 41 and the outer cover member 2 or the inner cover member 3, the shear strength between the two can be effectively improved.

[0151] In addition, the second cover member 41b can also be configured as an elastic member such as a silicon wafer or a rubber sheet. In this case, the vibration generated in the pole piece device 1 can be effectively attenuated by the damping effect of the second cover member 41b. It should be noted that the same effect can also be expected when using a Kevlar fiber-reinforced prepreg having vibration damping characteristics as the second cover member 41b.

[0152] In addition, the second cover member 41b can also be configured as a foamed sheet. In this case, since the foamed sheet has flexibility and can be adjusted in thickness, when assembling the magnetic pole piece 41 relative to the outer cover member 2 or the inner cover member 3, it can fill the gap generated between the two due to dimensional tolerances, or can absorb the interference even when interference occurs. Therefore, the assembly of the magnetic pole piece device 1 becomes easy. Furthermore, even when heated during manufacturing or operation, and a thermal expansion difference occurs between the magnetic pole piece 41 and the surrounding structure, it can be alleviated by the second cover member 41b. Therefore, peeling of the interface and the like can be effectively avoided.

[0153] In Figure 18 it shows a case where a single second cover member 41b is wound around the magnetic pole piece body 41a. In this case, after winding the prepreg that becomes the second cover member 41b around the magnetic pole piece body 41a, it is assembled to the outer cover member 2 and the inner cover member 3, and they are integrally cured. Thus, the second cover member 41b can be integrally formed with respect to the outer cover member 2 and the inner cover member 3 with good adhesive force, the rigidity can be improved, and the manufacturing process can be simplified.

[0154] In addition, the second cover member 41b can be formed by pasting a member cut in a manner corresponding to each surface of the magnetic pole piece body 41a having a substantially quadrilateral shape in a cross-section perpendicular to the axial direction, imitating the above-mentioned first cover member 15b, or can be formed by pasting and splicing in a substantially U-shaped manner (in a manner of covering the remaining surfaces except one surface).

[0155] Next, a specific structural example of the solid member 12 will be described. Figure 19 is a schematic diagram showing the structure at the connecting portion of the solid member 12 and the magnetic pole piece holder 10 in the magnetic pole piece device 1.

[0156] As described above, the solid member 12 is a member for connecting the end of the magnetic pole piece holder 10 and the rotor end plate 11 by being interposed between the end on the axial direction b of the magnetic pole piece holder 10 and the rotor end plate 11. The solid member 12 has a substantially cylindrical shape, and an uneven shape 19 in which unevenness is alternately arranged in the circumferential direction is provided at the end 12a on the side of the magnetic pole piece holder 10 along the axial direction b.

[0157] The uneven shape 19 has a shape complementary to the end of the magnetic pole piece holder 10 to which the solid member 12 is connected. Specifically, the concave portion 19a1 in the uneven shape 19 corresponds to the convex core material 15 at the end of the magnetic pole piece holder 10, and the convex portion 19a2 corresponds to the concave magnetic pole piece 41 at the end of the magnetic pole piece holder 10. Such an uneven shape 19 can facilitate the positioning when the solid member 12 is installed on the magnetic pole piece holder 10. Thereby, the jigs used in such positioning operations in the past can be omitted.

[0158] In addition, the concavo-convex shape 19 can be formed at the end portion 12a of the solid member 12 formed in a block shape by post-processing. For example, by performing machining as post-processing, the concavo-convex shape 19 can be formed with high precision. It should be noted that the solid member 12 has a substantially cylindrical shape. Therefore, for example, if die forming is performed, elastic recovery occurs during heating and forming, making it difficult to maintain the accuracy of the radius of curvature. However, by ensuring the dimensions using machining in this way, good shape accuracy can be obtained.

[0159] It should be noted that the solid member 12 having such a concavo-convex shape 19 can also be manufactured using a 3D printer. In this case, since there is no need for curing and machining, higher curvature accuracy can be obtained.

[0160] The solid member 12 having such a structure is mounted on the outer cover member 2 or the inner cover member 3 using an adhesive, for example. Figure 20A and Figure 20B shows Figure 19 a schematic view of an example of mounting the solid member 12 shown with respect to the outer cover member 2 or the inner cover member 3. In Figure 20A the embodiment shown, the solid member 12 is divided into a plurality of sub-members 12a, 12b, 12c,... along the circumferential direction, and they are respectively mounted on the outer cover member 2 or the inner cover member 3 using an adhesive, for example. In Figure 20A the embodiment, during the period when the adhesive is in an uncured state, a fixing jig is required to self-support and hold the plurality of sub-members 12a, 12b, 12c,... with respect to the outer cover member 2 or the inner cover member 3 as the mounting object. On the other hand, in Figure 20B the embodiment shown, by providing a complementary jigsaw structure 21 between adjacent sub-members 12a, 12b, 12c,..., self-supporting holding can be achieved without using a fixing jig, and workability can be improved.

[0161] In addition, in Figure 20A and Figure 20BIn [description], the situation where the solid member 12 is installed on the inner shroud member 3 and then the pole pieces 41 and the core material 15 are installed on the solid member 12 fixed to the inner shroud member 3 is shown. By installing the solid member 12 on the inner shroud member 3 earlier than the pole pieces 41 and the core material 15 in this way, the positioning accuracy of the subsequently installed pole pieces 41 and core material 15 can be improved. This is advantageous in terms of achieving good workability even when the pole piece device 1 is large. For example, when the pole piece device 1 is large, installing the solid member 12 on the inner shroud member 3 requires operating equipment such as a crane. However, if the solid member 12 is installed first using the operating equipment, the remaining pole pieces 41 and core material 15 are relatively lightweight, so operating equipment is not required, and the work can be simplified.

[0162] Figure 21 is a schematic diagram showing another installation example of the solid member 12. In Figure 21 the illustrated embodiment, with the pole pieces 41 and the core material 15 pre-installed on the solid member 12, the solid member 12, the pole pieces 41, and the core material 15 are integrally installed on the inner shroud member 3. By installing in this way, the work can also be simplified.

[0163] In addition, when the outer shroud member 2, the inner shroud member 3, and the wall member 20 are formed of fiber-reinforced plastic, in these members, the fiber direction can be set so as to be close to the thermal expansion rate of the pole piece 41. Thereby, when heated during heat treatment or operation, the difference in thermal expansion rate between these members and the pole piece 41 can be reduced, and interfacial peeling between these members and the pole piece 41 can be suppressed.

[0164] To make the thermal expansion rate of these members close to that of the pole piece 41, for example, the fiber direction in the outer shroud member 2, the inner shroud member 3, and the wall member 20 can also be set to avoid the axial direction b. Specifically, by setting the fiber direction to 90° with respect to the axial direction b, the centrifugal load and electromagnetic force acting on the pole piece 41 can be effectively borne. In addition, by setting the fiber direction to 45° with respect to the axial direction b, the torque load of the rotor can be borne.

[0165] Next, the connection structure between the solid member 12 and the rotor end plate 11 will be described. Figure 22A is an example of a longitudinal sectional view along the axial direction b of the connection structure including the solid member 12 and the rotor end plate 11, Figure 22B is a top view showing the Figure 22A connection structure from the radially outer side.

[0166] In Figure 22A and Figure 22BIn the illustrated embodiment, the solid member 12 has a metal pad 62 provided on an end face 60 facing the rotor end plate 11 as a connection object. A plurality of the metal pads 62 are provided along the circumferential direction on the end face 60. These metal pads 62 are provided at positions where they do not interfere with the above-described fastening rods 44. The intervals between adjacent metal pads 62 are set, for example, to be equal intervals. Each metal pad 62 has a substantially hemispherical shape and is formed of, for example, a metal material. By the solid member 12 having the metal pads 62, the shear load generated in the fastening bolts 44 can be reduced, and wear of the end face 60 can be suppressed.

[0167] Figure 23A FIG. 4 is another longitudinal sectional view along the axial direction b of the connection structure including the solid member 12 and the rotor end plate 11. Figure 23B as viewed from the radially outer side Figure 23A of the connection structure.

[0168] In Figure and ​ the illustrated embodiment, the solid member 12 and the rotor end plate 11 are provided with a guide bushing 64 provided along the connection bolt 44. By providing such a guide bushing 64, the guide bushing 64 bears the shear force generated in the fastening bolt 44, effectively preventing shear failure of the fastening bolt 44, and thus the reliability can be improved.

[0169] Further, the guide bushing 64 is provided substantially parallel to the axial direction b. Thus, by inserting the guide bushing 64 into the hole portion 43 into which the fastening rod 44 is inserted, the guide bushing 64 can be installed without further machining.

[0170] Further, the guide bushing 64 is continuously provided across the solid member 12 and the rotor end plate 11. Thus, for example, when assembling the solid member 12 and the rotor end plate 11, the guide bushing 64 is first installed on the solid member 12 side, and then when assembling the rotor end plate 11, positioning based on the guide bushing 64 can be performed, and the assembly dimensional accuracy can be effectively improved.

[0171] ​ FIG. 25 is another longitudinal sectional view along the axial direction b of the connection structure including the solid member 12 and the rotor end plate 11. ​ as viewed from the radially outer side ​ of the connection structure.

[0172] In ​ and ​In the illustrated embodiment, the solid member 12 is connected to the rotor end plate 11 by arranging the fastening bolts 44 perpendicular to the axial direction b. In this case, similar to the above-described embodiment, by arranging the guide bush 64 along the fastening bolts 44, the guide bush 64 is used to bear the shear force generated in the fastening bolts 44, effectively avoiding the shear failure of the fastening bolts 44, enabling positioning in the axial direction b, and effectively improving the assembly dimensional accuracy.

[0173] ​ FIG. is a perspective view showing another structural example of the core material 15. As ​ shown in the core main body 15a, the core material 15 may have a hollow structure with a hollow portion 15a1 extending along the axial direction b. In this case, by allowing a cooling medium such as cooling air to flow through the hollow portion 15a1, the cooling performance can be improved, and good structural strength can be obtained.

[0174] ​ FIG. is a schematic diagram showing ​ the manufacturing process of the core material 15 shown. First, a core material 70 having a substantially cylindrical shape extending along the axial direction b corresponding to the hollow portion 15a1 is prepared. Then, a prepreg 72 for forming the core material 15 is wound around the outer surface of the core material 70 and cured, thereby forming the core material 15. Then, the core material (pulled out along the axial direction) is removed from the formed core material 15, thus completing the core material 15. Generally, it is difficult to form the hollow portion 15a1 in the core material 15 having a long strip shape along the axial direction b by machining. However, by curing the prepreg 72 wound around the core material 70 in this way for forming, the core material 15 having a hollow structure can be manufactured without machining.

[0175] It should be noted that, in the present embodiment, the case where the cross-sectional shape of the hollow portion 15a1 is substantially circular is illustrated, but the cross-sectional shape of the hollow portion 15a may also be any shape such as a polygon or a star shape. In addition, in the present embodiment, the case where the core material 15 has one hollow portion 15a1 is illustrated, but it may also have a plurality of hollow portions 15a1.

[0176] It should be noted that the core material 70 may also be cured together with the core material 15 by using a prepreg material. In this case, by curing the core material 15 and the core material 70 simultaneously, the forming process can be simplified.

[0177] Next, ​ FIG. is an example of a cross-sectional view of the core material 15 perpendicular to the axial direction b. An attenuation member 74 for attenuating vibration may be provided on at least a part of the surface of the core material 15 facing the outer cover member 2 and the inner cover member 3 constituting the pole piece holder 10. In ​In [the structure], a first damping member 74A is provided on a first surface 75A of the core material 15 facing the outer cover member 2, and a second damping member 74B is provided on a second surface 75B facing the inner cover member 3. In the pole piece device 1, by providing such damping members, vibration can be absorbed to obtain good shock resistance. In particular, since the first damping member 74A is provided along the first surface 74A facing the outer cover member 2 that is easily affected by vibration, the damping effect can be easily obtained.

[0178] ​ is ​ a modified example. As ​ shown in the modified example, the core material 15 may also be divided into a plurality of plate-like members 76 along the thickness direction. By making the pole piece holder 10 into such a divided structure in this way, friction is generated between the plate-like members 76 when vibration occurs, so that the vibration energy is converted into heat energy to obtain a good damping effect. In this case, a third damping member 74C may also be provided between two adjacent plate-like members 76. By providing the third damping member 74C inside the core material 15 in this way, the vibration propagating inside can be repeatedly reflected and absorbed between the damping members, and an improvement in the damping effect can be expected.

[0179] It should be noted that the material constituting each of the above damping members 74 is not limited. For example, a polymer fiber reinforced composite material can be used. The polymer fiber reinforced composite material can be cured simultaneously with the outer cover member 2, the inner cover member 3, and the wall member made of fiber reinforced plastic. Therefore, by integrally forming with these members, better structural strength can be obtained. In addition, the damping member 74 may also be formed of a resin-based highly elastic material. In this case, the vibration is absorbed by the elasticity of the damping member 74, and the damping characteristics can be obtained more effectively.

[0180] In addition, between two adjacent plate-like members 76, a sliding member may be arranged instead of or in addition to the third damping member 74C. The sliding member can use a resin material such as Teflon (registered trademark), for example, and can effectively prevent the divided members from wearing due to friction.

[0181] In addition, when the core material 15 is divided into a plurality of plate-like members 76, the natural vibration frequency of the pole piece holder 10 can also be adjusted by appropriately changing the division pattern. In this case, by setting the division pattern so that the natural vibration frequency of the pole piece holder 10 is different from the vibration frequency generated in the pole piece holder 10, excellent damping characteristics can be obtained. In addition, in ​ as an example, the case where the thickness is made uniform is shown, but in order to obtain the required damping characteristics, for example, the thickness may also be adjusted so that it is thin on the outside and thick on the inside.

[0182] ​ is ​ Another modified example of ​ In this modified example, the core material 15 shown in is divided into a first member 15-1 on the side of the outer cover member 2 and a second member 15-2 on the side of the inner cover member 3. In this case, by also disposing a fourth attenuation member 74D at the interface between the first member 15-1 and the second member 15-2, the attenuation characteristics can be improved. The core material 15 is formed as follows: after laminating materials to form the first member 15-1 and the second member 15-2 respectively, when assembling the two, the fourth attenuation member 74D is laminated at the interface between the first member 15-1 and the second member 15-2.

[0183] It should be noted that, in the case of using an elastic adhesive as the fourth attenuation member 74D, after the first member 15-1 and the second member 15-2 are respectively cured and formed, the fourth attenuation member 74D as an elastic adhesive can be disposed at the interface between the two and the two can be bonded to complete the core material 15. Thereby, an improvement in the internal quality of the pole piece holder 10 can be expected.

[0184] ​ is ​ Another modified example of ​ Based on the modified example of , a fifth attenuation member 74E is further provided along the hollow portion 15a1. For such a fifth attenuation member 74E, when forming the hollow portion 15a1 using the core material 70 as described above, an attenuation material can be wound and disposed on the outer surface of the core material 70.

[0185] In addition, a sixth attenuation member 74F can be provided on the outer surface of at least one of the outer cover member 2 and the inner cover member 3. ​ is ​ A modified example of . In this modified example, when observed in a cross section perpendicular to the axial direction b, a sixth attenuation member 74F is provided on at least a part of the outer surface (the radially outer surface) of the outer cover member 2. In this modified example, the sixth attenuation member 74F is provided over a large area along the outer surface of the outer cover member 2. In the pole piece device 1, by providing the sixth attenuation member 74F in this way, the attenuation characteristics can be improved. Especially for the case where the deformation is likely to become larger on the radially outer side during vibration, by providing the sixth attenuation member 74F on the outer surface of the outer cover member 2 as in this modified example, the attenuation characteristics can be effectively improved.

[0186] In addition, ​ is ​ Another modified example of ​Based on the illustrated modified example, a sixth damping member 74F is also provided on at least a part of the outer surface (the radially inner surface) of the inner cover member 3. In this modified example, the sixth damping member 74F is provided over a large area along the outer surface of the inner cover member 3. By providing the sixth damping member 74F on the outer surfaces of both the outer cover member 2 and the inner cover member 3 in this way, the damping characteristics of the pole piece device 1 can be further improved.

[0187] Such a sixth damping member 74F can also be formed of a material including a fiber-reinforced composite material such as a polymer fiber-reinforced composite material, for example. Such a material can be cured simultaneously with the outer cover member 2 and the inner cover member 3 made of fiber-reinforced plastic. Therefore, by integrating the sixth damping member 74F with the outer cover member 2 and the inner cover member 3, the damping characteristics can be improved while maintaining the structural strength.

[0188] It should be noted that the sixth damping member 74F can also be provided only on the outer surface of the inner cover member 3.

[0189] In addition, ​ is ​ Another modified example. In this modified example, when observed in a cross-section perpendicular to the axial direction b, a seventh damping member 74G is provided so as to at least partially surround the core material 15. In ​ the seventh damping member 74G is provided so as to surround the entire circumference of the core material 15. In the pole piece device 1, by providing the seventh damping member 74G in this way, the damping characteristics can be improved.

[0190] Such a seventh damping member 7G is the same as the above-described sixth damping member 74F and can also be formed of a material including a fiber-reinforced composite material such as a polymer fiber-reinforced composite material, for example. Such a material can be cured simultaneously with the outer cover member 2 and the inner cover member 3 made of fiber-reinforced plastic. Therefore, by integrating the seventh damping member 74G with the outer cover member 2 and the inner cover member 3, the improvement of the damping characteristics can be achieved while maintaining the structural strength.

[0191] In addition, ​ is ​ Another modified example. In this modified example, it is a combination of the above-described modified examples. The sixth damping member 74F is provided on the outer surfaces of the outer cover member 2 and the inner cover member 3, respectively, and the seventh damping member 74G is provided so as to surround the core material 15. By having both the sixth damping member 74F and the seventh damping member 74G in this way, the damping characteristics can also be further improved.

[0192] In addition, within the scope not departing from the gist of the present invention, the constituent elements of the above-described embodiments can be appropriately replaced with well-known constituent elements, and the above-described embodiments can also be appropriately combined.

[0193] The content described in each of the above embodiments is grasped as follows, for example.

[0194] (1) The pole piece device of a magnetic gear according to one aspect (for example, the pole piece device 1 of the above embodiment) includes:

[0195] An outer peripheral cover member (for example, the outer peripheral cover member 2 of the above embodiment) and an inner peripheral cover member (for example, the inner peripheral cover member 3 of the above embodiment), which are coaxially arranged on the outer side and the inner side in the radial direction of a magnetic gear (for example, the magnetic gear 9 of the above embodiment), respectively, and each has a cylindrical shape;

[0196] A pole piece holder (for example, the pole piece holder 10 of the above embodiment), which is formed by partitioning a cylindrical space (for example, the cylindrical space 8 of the above embodiment) formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member (for example, the wall member 20 of the above embodiment) extending along the radial direction; and

[0197] Pole pieces (for example, the pole pieces 41 of the above embodiment), which are held by the pole piece holder,

[0198] The inner ring member, the outer ring member, and the wall member are integrally formed.

[0199] According to the aspect (1) above, the outer peripheral cover member and the inner peripheral cover member are interconnected by a wall member extending along the radial direction and integrally formed therewith, whereby a pole piece device having excellent rigidity can be realized. Thus, when the magnetic gear transmits power, the risk that the pole piece device comes into contact with the outer diameter side excitation magnet and the inner diameter side excitation magnet arranged with a gap due to deformation can be effectively avoided.

[0200] (2) In several aspects, on the basis of the aspect (1) above,

[0201] The outer peripheral cover member and the inner peripheral cover member are fixed to a rotor end plate (for example, the rotor end plate 11 of the above embodiment) via a connecting member (for example, the connecting member 13 of the above embodiment) embedded in a solid member (for example, the solid member 12 of the above embodiment) arranged in the cylindrical space.

[0202] According to the aspect (2) above, the outer peripheral cover member, the inner peripheral cover member, and the rotor end plate are firmly fixed to each other via the connecting member embedded in the solid member, and good rigidity can be obtained with a stable structure.

[0203] (3) Among several solutions, based on the solution of (2) above,

[0204] The solid member has a shape complementary to the end of the rotor end plate.

[0205] According to the solution of (3) above, by the solid member having a shape complementary to the end of the rotor end plate, when connecting the solid member to the rotor end plate, the positioning of the two can be easily carried out using the complementary shape.

[0206] (4) Among several solutions, based on the solution of (2) or (3) above,

[0207] The solid member has at least one metal pad (such as the metal pad 62 in the above embodiment) provided on the end face facing the rotor end plate.

[0208] According to the solution of (4) above, by the solid member having such a metal pad, the shear load generated between the solid member and the rotor end plate can be reduced, and the wear of the end face facing the rotor end plate can be effectively suppressed.

[0209] (5) Among several solutions, based on any one of the solutions of (2) to (4) above,

[0210] A guide bushing (such as the guide bushing 64 in the above embodiment) is provided on the solid member and the rotor end plate along the connecting bolt.

[0211] According to the solution of (5) above, by having such a guide bushing, using the guide bushing to bear the shear force generated by the fastening bolt, the shear failure of the fastening bolt can be effectively prevented, thereby improving the reliability.

[0212] (6) Among several solutions, based on any one of the solutions of (2) to (5) above,

[0213] The pole piece includes a plurality of pole plate materials (such as the pole plate material 41a in the above embodiment) laminated along the axial direction,

[0214] The plurality of pole plate materials are fixed to the solid member via a fastening rod (such as the fastening rod 44 in the above embodiment) passing through the hole portions provided in each of the plurality of pole plates.

[0215] According to the solution of (6) above, the pole piece composed of a plurality of pole plate materials laminated along the axial direction can be fixed to the rotor end plate together with the outer peripheral cover member and the inner peripheral cover member via the solid member using the fastening rod. By adopting such a structure, the rigidity of the pole piece device can be more effectively improved.

[0216] (7) In several aspects, based on any one of the above (1) to (6),

[0217] The outer peripheral cover member, the inner peripheral cover member, and the wall member are each configured to include carbon fiber reinforced plastic.

[0218] According to the aspect of the above (7), by integrally forming the outer peripheral cover member, the inner peripheral cover member, and the wall member with carbon fiber reinforced plastic that is lightweight, high-strength, and has more excellent formability, a pole piece device with good rigidity can be realized.

[0219] (8) In several aspects, based on the aspect of the above (7),

[0220] At least one of the outer peripheral cover member and the inner peripheral cover member includes: a first layer (for example, the first layers 2a and 3a in the above embodiments), the fiber direction of which includes a first direction along the circumferential direction; and a second layer (for example, the second layers 2b and 3b in the above embodiments), the fiber direction of which includes a second direction intersecting the first direction.

[0221] According to the aspect of the above (8), at least one of the outer peripheral cover member and the inner peripheral cover member is formed by combining a plurality of layers having mutually different fiber directions. Thereby, when the magnetic gear transmits power, the rigidity against flexural deformation generated in the pole piece device due to the load received from the outer diameter side excitation magnet or the inner diameter side excitation magnet and the rigidity against torsional deformation with respect to torque transmission can be effectively improved.

[0222] (9) In several aspects, based on the aspect of the above (7) or (8),

[0223] The wall member is made of pitch-based CFRP.

[0224] According to the aspect of the above (9), pitch-based CFRP has excellent thermal conductivity compared with PAN-based CFRP. Therefore, by forming the wall member adjacent to the pole piece that generates heat during operation with pitch-based CFRP, the heat dissipation function from the pole piece can be effectively improved.

[0225] (10) In several aspects, based on any one of the above (1) to (9),

[0226] It further includes a core material (for example, the core material 15 in the above embodiments), and the core material fills the adjacent space (for example, the adjacent space 14 in the above embodiments) formed between adjacent pole piece holders in the cylindrical space.

[0227] According to the aspect of the above (10), by filling the adjacent space with the core material, the rigidity of the pole piece device can be more effectively improved.

[0228] In several aspects, based on the aspect of (10) above,

[0229] The core material includes:

[0230] A core body (such as the core body 15a in the above embodiment); and

[0231] A first cover member (such as the first cover member 15b in the above embodiment), which at least partially surrounds the core body.

[0232] According to the aspect of (11) above, the core material is configured to include a core body and a first cover member. By at least partially surrounding the core body with the first cover member, good structural strength is obtained. In particular, axial rigidity and torsional rigidity with respect to torque transmission can be maintained, and weight reduction and improvement in workability during manufacturing can be expected.

[0233] In several aspects, based on the aspect of (10) or (11) above,

[0234] At least a part of the surface of the core material facing the outer cover member or the inner cover member is provided with a damping member (such as the damping member 74 in the above embodiment) for attenuating vibration.

[0235] According to the aspect of (12) above, by the pole piece device having a damping member, vibration generated during operation can be absorbed, and good shock resistance can be obtained.

[0236] In several aspects, based on any one of the aspects (1) to (12) above,

[0237] A damping member (such as the sixth damping member 74F in the above embodiment) is provided so as to at least partially cover the outer surface of at least one of the outer cover member and the inner cover member.

[0238] According to the aspect of (13) above, by using the damping member to cover at least a part of the outer surface of at least one of the outer cover member 2 and the inner cover member 3, the damping characteristics of the pole piece device can be improved. In addition, especially for the case where the deformation is likely to become larger in the radial outer side during vibration, by providing a damping member on the outer surface of the outer cover member, the damping characteristics can be effectively improved.

[0239] In several aspects, based on any one of the aspects (10) to (13) above,

[0240] A damping member (such as the seventh damping member 74G in the above embodiment) is provided so as to at least partially surround the core material.

[0241] According to the solution in (14) above, by arranging the damping member in a way that surrounds the entire circumference of the core material, the damping characteristics of the pole piece device can be improved. Additionally, for example, when the damping member is formed of a fiber-reinforced composite material, the damping member can be cured simultaneously with the outer cover member and the inner cover member. Therefore, by integrating the damping member with the outer cover member and the inner cover member, the damping characteristics can be improved while maintaining the structural strength.

[0242] (15) In several solutions, based on any one of the solutions in (1) to (9) above,

[0243] The adjacent space (such as the adjacent space 14 in the above embodiment) formed between the adjacent pole piece holders in the cylindrical space is formed as a hollow core.

[0244] The hollow core communicates with the outside via cooling holes (such as the cooling hole 17 in the above embodiment) that open along the radial direction in at least one of the outer peripheral cover member and the inner peripheral cover member.

[0245] According to the solution in (15) above, by guiding the cooling medium to the adjacent space formed as a hollow core via the cooling holes provided in at least one of the outer peripheral cover member and the inner peripheral cover member, a good cooling effect can be obtained.

[0246] (16) In several solutions, based on any one of the solutions in (1) to (15) above,

[0247] The pole piece includes:

[0248] A pole piece main body (such as the pole piece main body 41a in the above embodiment); and

[0249] A second cover member (such as the second cover member 41b in the above embodiment) that at least partially surrounds the pole piece main body.

[0250] According to the solution in (16) above, the pole piece is configured to include a pole piece main body and a second cover member. By the second cover member at least partially surrounding the pole piece main body, good structural strength is obtained. In particular, the axial rigidity and the torsional rigidity against torque transmission can be maintained, and weight reduction and improved workability during manufacturing can be expected.

[0251] (17) In several solutions, based on any one of the solutions in (1) to (16) above,

[0252] The fiber-reinforced plastic constituting at least a part of the outer cover member, the inner cover member, and the wall member sets the fiber direction so that the thermal expansion rate is close to that of the pole piece.

[0253] According to the solution of (17) above, when the outer cover member, the inner cover member, and the wall member are formed of fiber-reinforced plastic, at least a part of these members sets the fiber direction so as to be close to that of the pole piece. Thereby, when heated during heat treatment or operation, the difference in the thermal expansion rate between these members and the pole piece can be reduced, and interfacial peeling between these members and the pole piece can be effectively suppressed.

[0254] (18) A magnetic gear according to one solution (for example, the magnetic gear 9 of the above-described embodiment) includes:

[0255] The pole piece device according to any one of the above (1) to (8);

[0256] An inner diameter side excitation magnet (for example, the inner diameter side excitation magnet 7 of the above-described embodiment), which is disposed at a position closer to the inner circumference than the pole piece device; and

[0257] An outer diameter side excitation magnet (for example, the outer diameter side excitation magnet 5 of the above-described embodiment), which is disposed at a position closer to the outer circumference than the pole piece device.

[0258] According to the solution of (18) above, by providing a pole piece device having good rigidity, when the magnetic gear transmits power, the risk that the pole piece device comes into contact with the outer diameter side excitation magnet and the inner diameter side excitation magnet disposed with a gap therebetween due to deformation can be effectively avoided.

[0259] (19) A method for manufacturing a pole piece device of a magnetic gear according to one solution is a method for manufacturing a pole piece device of a magnetic gear,

[0260] The pole piece device of the magnetic gear includes:

[0261] An outer peripheral cover member (for example, the outer peripheral cover member 2 of the above-described embodiment) and an inner peripheral cover member (for example, the inner peripheral cover member 3 of the above-described embodiment), which are coaxially disposed on the outer side and the inner side in the radial direction of the magnetic gear (for example, the magnetic gear 9 of the above-described embodiment), respectively, and each has a cylindrical shape;

[0262] A pole piece holder (for example, the pole piece holder 10 of the above-described embodiment), which is formed by partitioning a cylindrical space (for example, the cylindrical space 8 of the above-described embodiment) formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member (for example, the wall member 20 of the above-described embodiment) extending along the radial direction; and

[0263] A pole piece (for example, the pole piece 41 of the above-described embodiment), which is held by the pole piece holder,

[0264] The inner ring member, the outer ring member, and the wall member are integrally formed, wherein,

[0265] The manufacturing method of the pole piece device of the magnetic gear includes the following steps:

[0266] Integrally form one of the outer peripheral cover member and the inner peripheral cover member with the wall member to manufacture a first intermediate formed article (for example, the first intermediate formed articles 54, 54' in the above embodiment);

[0267] Insert the pole piece into the recess formed between the adjacent wall members in the first intermediate formed article to manufacture a second intermediate formed article (for example, the second intermediate formed articles 55, 55' in the above embodiment); and

[0268] Mount the other of the outer peripheral cover member and the inner peripheral cover member on the second intermediate formed article and integrally form them.

[0269] According to the above-mentioned solution (19), by integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member, the first intermediate formed article can be manufactured with good shape accuracy. Thus, when inserting the pole piece into the pole piece holder, there is no need for the operation of finely adjusting the pole piece holder through additional processing. In addition, by using the second intermediate formed article with the pole piece inserted therein as a new forming die to integrally form the inner peripheral cover member, the shape accuracy of the inner peripheral cover member is also improved, and there is no need for redundant processing and bonding processes, enabling productivity improvement and cost reduction.

[0270] (20) In several solutions, based on the above-mentioned solution (19),

[0271] The second intermediate formed article is manufactured by integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member and the pole piece when integrally forming the first intermediate formed article.

[0272] According to the above-mentioned solution (20), when integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member, the pole piece is also integrally formed, thereby further simplifying the manufacturing process and enabling further productivity improvement and cost reduction.

[0273] Explanation of reference numerals:

[0274] 1... Pole piece device;

[0275] 2... Outer peripheral cover member;

[0276] 3... Inner peripheral cover member;

[0277] 5... Outer diameter side exciting magnet;

[0278] -]]6... Coil;

[0279] 7... Inner diameter side exciting magnet;

[0280] 8... Cylindrical space;

[0281] 9... Magnetic gear;

[0282] 10... Pole piece holder;

[0283] 11... Rotor end plate;

[0284] 12... Solid member;

[0285] 13... Connecting member;

[0286] 14... Adjacent space;

[0287] 15... Core material;

[0288] 17... Cooling hole;

[0289] 20... Wall member;

[0290] 41... Pole piece;

[0291] 41a... Pole piece material;

[0292] 43... Hole part;

[0293] 44... Fastening rod;

[0294] 49, 56... Vacuum bag;

[0295] 50... Forming die;

[0296] 51... Magnetic pole pair;

[0297] 52... Support member;

[0298] 53, 57... Rubber heater;

[0299] 54... First intermediate formed product;

[0300] 55... Second intermediate formed product;

[0301] 59... Heater;

[0302] 71... Inner diameter magnetic pole pair;

[0303] 72... Inner diameter support member;

[0304] D... Cooling medium;

[0305] G... Gap;

[0306] H... Outer shell.

Claims

1. A pole piece device of a magnetic gear, wherein, The pole piece device of the magnetic gear includes: An outer peripheral cover member and an inner peripheral cover member, which are coaxially arranged on the outer side and the inner side in the radial direction of the magnetic gear respectively, and each has a cylindrical shape; A pole piece holder, which is formed by dividing a cylindrical space formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member extending along the radial direction; and Pole pieces, which are held by the pole piece holder, The outer peripheral cover member, the inner peripheral cover member and the wall member are integrally formed, The outer peripheral cover member and the inner peripheral cover member are fixed to the rotor end plate via connecting members embedded in a solid member arranged in the cylindrical space.

2. The pole piece device of the magnetic gear according to claim 1, wherein, The solid member has a complementary shape that can be engaged with the concave-convex shape provided at the end of the rotor end plate.

3. The pole piece device of the magnetic gear according to claim 1, wherein, The solid member has at least one metal pad provided on the end face facing the rotor end plate.

4. The pole piece device of the magnetic gear according to claim 1, wherein, Guide bushings are provided on the solid member and the rotor end plate along the connecting bolts.

5. The pole piece device of the magnetic gear according to claim 1, wherein, The pole piece includes a plurality of pole plate materials laminated along the axial direction, The plurality of pole plate materials are fixed to the solid member via fastening rods passing through the hole portions provided in each of the plurality of pole plate materials.

6. The pole piece device of the magnetic gear according to claim 1, wherein, The outer peripheral cover member, the inner peripheral cover member and the wall member are each configured to include carbon fiber reinforced plastic.

7. The pole piece device of the magnetic gear according to claim 6, wherein, At least one of the outer peripheral cover member and the inner peripheral cover member includes: a first layer, the fiber direction of the carbon fiber reinforced plastic in the first layer has a first direction along the circumferential direction; and a second layer, the fiber direction of the second layer has a second direction intersecting with the first direction.

8. The pole piece device of the magnetic gear according to claim 6, wherein, The wall member includes pitch-based CFRP.

9. The pole piece device of the magnetic gear according to any one of claims 1 to 8, wherein, The pole piece device of the magnetic gear further includes a core material, and the core material fills the adjacent space formed between adjacent pole piece holders in the cylindrical space.

10. The pole piece device of the magnetic gear according to claim 9, wherein, The core material includes: A core body; and A first cover member, which at least partially surrounds the core body.

11. The pole piece device of the magnetic gear according to claim 9, wherein, At least a part of the surface of the core material facing the outer peripheral cover member or the inner peripheral cover member is provided with a damping member for damping vibration.

12. The pole piece device of the magnetic gear according to any one of claims 1 to 8, wherein, The pole piece device of the magnetic gear is provided with a damping member in such a way as to at least partially cover the outer surface of at least one of the outer peripheral cover member and the inner peripheral cover member.

13. The pole piece device of the magnetic gear according to claim 10 or 11, wherein, The pole piece device of the magnetic gear is provided with a damping member in such a way as to at least partially surround the core material.

14. The pole piece device of the magnetic gear according to any one of claims 1 to 8, wherein, The adjacent space formed between adjacent pole piece holders in the cylindrical space is formed as a hollow core, The hollow core communicates with the outside through cooling holes that open along the radial direction in at least one of the outer peripheral cover member and the inner peripheral cover member.

15. The pole piece device of the magnetic gear according to any one of claims 1 to 8, wherein, The pole piece includes: A pole piece main body; and A second cover member that at least partially surrounds the pole piece main body.

16. The pole piece device of the magnetic gear according to any one of claims 1 to 8, wherein, The carbon fiber reinforced plastic constituting at least a part of the outer peripheral cover member, the inner peripheral cover member, and the wall member sets the fiber direction so that the thermal expansion rate is close to that of the pole piece.

17. A magnetic gear, wherein, The magnetic gear includes: The pole piece device according to any one of claims 1 to 16; An inner diameter side excitation magnet disposed at a position closer to the inner circumference than the pole piece device; and An outer diameter side excitation magnet disposed at a position closer to the outer circumference than the pole piece device.

18. A manufacturing method of a pole piece device of a magnetic gear, the pole piece device of the magnetic gear including: An outer peripheral cover member and an inner peripheral cover member that are coaxially disposed on the outer side and the inner side in the radial direction of the magnetic gear, respectively, and each have a cylindrical shape; A pole piece holder formed by partitioning a cylindrical space formed between the inner peripheral surface of the outer peripheral cover member and the outer peripheral surface of the inner peripheral cover member by a wall member extending along the radial direction; and A pole piece held by the pole piece holder, The outer peripheral cover member, the inner peripheral cover member, and the wall member are integrally formed, Wherein, The manufacturing method of the pole piece device of the magnetic gear includes the following steps: Integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member to manufacture a first intermediate formed product; Inserting the pole piece into a recess formed between adjacent wall members in the first intermediate formed product to manufacture a second intermediate formed product; And Mounting the other of the outer peripheral cover member and the inner peripheral cover member on the second intermediate formed product and integrally forming them.

19. The manufacturing method of the pole piece device of the magnetic gear according to claim 18, wherein, The second intermediate formed product is manufactured by integrally forming one of the outer peripheral cover member and the inner peripheral cover member with the wall member and the pole piece when integrally forming the first intermediate formed product.

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