Coil unit

Abstract

To provide a coil unit which can improve a coupling coefficient while securing serviceability and robustness of respective units at a power transmission side of non-contact power transmission and at a power reception side thereof.SOLUTION: A coil unit 10 comprises a coil 13, and a magnetic resin member (back member 16 and inner member 17). The magnetic resin member (back member 16 and inner member 17) is arranged at the rear side of the coil 13 when viewed from the other side when a power transmission side and a power reception side are opposed to each other. In the tabular back member 16, a through hole 16H penetrated in an axial direction along a center axis line O of the coil 13 is formed. A frame-like wall part (power reception side wall part 41 or power transmission side wall part) of the inner member 17 protrudes from a peripheral part 16a of the through hole 16H in the axial direction to be arranged in an air-core region of the coil 13. A lid part (power reception side lid part 43 or power transmission side lid part) of the inner member 17 opens / closes a protrusion side opening end of the wall part (power reception side wall part 41 or power transmission side wall part).SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a coil unit.

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development have been carried out on the charging and discharging of vehicles equipped with secondary batteries that contribute to energy efficiency. Conventionally, in a non-contact power transmission system that supplies power to a vehicle from outside the vehicle by non-contact power transmission, a coil device including a coil and a magnetic flux conductor disposed inside and on the back side of the coil is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the technology related to charging and discharging of vehicles equipped with secondary batteries, in non-contact power transmission, while ensuring desired maintainability and robustness in each unit on the power transmission side and the power reception side, it is desired to reduce magnetic flux other than the main magnetic flux (leakage magnetic flux) and improve the coupling coefficient. For example, like the coil device of the above prior art, if the magnetic flux conductor is only formed by a core portion and a flat plate portion made of a magnetic material and resin, it is impossible to improve both maintainability and robustness, and there arises a problem that the coupling coefficient cannot be improved while ensuring versatility in each unit.

[0005] An object of the present invention is to provide a coil unit that can improve the coupling coefficient while ensuring ease of maintenance and robustness in each unit on the power transmission side and the power reception side of non-contact power transmission. And, by extension, it contributes to energy efficiency improvement.

Means for Solving the Problems

[0006] In order to solve the above problems and achieve the above object, the present invention adopts the following aspects. (1): A coil unit (for example, coil unit 10 in the embodiment) according to an aspect of the present invention includes a coil (for example, coil 13 in the embodiment) that transmits or receives power by non-contact power transmission, and a magnetic resin member disposed on the rear side of the coil as viewed from the other side when the power transmission side and the power reception side face each other (for example, back member 16 and inner member 17 in the embodiment). The magnetic resin member includes a plate-shaped support portion (for example, back member 16 in the embodiment) in which a hole (for example, through hole 16H in the embodiment) penetrating in the axial direction along the central axis of the coil (for example, central axis O in the embodiment) is formed, a frame-shaped wall portion (for example, power reception side wall portion 41, power transmission side wall portion 51 in the embodiment) that protrudes in the axial direction from the peripheral edge of the hole (for example, peripheral edge portion 16a in the embodiment) and is disposed in the hollow region of the coil (for example, hollow region 13a in the embodiment), and a lid portion (for example, power reception side lid portion 43, power transmission side lid portion 53 in the embodiment) that opens and closes the protruding side opening end of the wall portion.

[0007] (2): In the coil unit described in (1) above, the contact surfaces of the wall portion and the lid portion with each other (for example, inner surfaces 41A, 51A and outer surfaces 43A, 53A in the embodiment) may be curved surfaces in which the positions in the direction orthogonal to the axial direction gradually change as the positions in the axial direction gradually change.

[0008] (3): In the coil unit described in (1) or (2) above, the contact surfaces of the wall portion and the support portion with each other (for example, inner surface 16A and outer surfaces 41B, 51B in the embodiment) may be inclined surfaces inclined at a predetermined angle with respect to the axial direction.

Effects of the Invention

[0009] According to (1) above, by providing a magnetic resin member disposed on the rear side of the coil, robustness can be ensured as compared with the case of providing a magnetic member such as a ferrite core. For example, an increase in eddy current loss due to breakage or defect, etc., and the occurrence of ground faults and short circuits due to insulation layer breakdown through fragments can be suppressed. By providing the magnetic resin member with a wall portion and a lid portion inserted into the hollow region of the coil, the distribution of the main magnetic flux between the power transmission side and the power reception side can be expanded at the center in the direction orthogonal to the axial direction, and the core constant of the entire system can be improved. By improving the core constant, the main magnetic flux can be concentrated at the center, an increase in the magnetic flux density outside in the direction orthogonal to the axial direction can be suppressed, and the coupling coefficient can be improved. By providing a lid portion that opens and closes the protruding side opening end of the wall portion, the hollow region formed by the wall portion can be easily exposed to the outside, and for example, the ease of various maintenance operations can be improved for various devices and members disposed in the internal space communicating with the hollow region.

[0010] In the case of (2) above, since the contact surfaces of the wall portion and the lid portion with each other are curved surfaces, displacement due to vibration or the like can be suppressed, and for example, a change in dielectric constant due to the inflow of water or the like and a decrease in coil performance can be suppressed. Generation of biting or the like when the lid portion is opened and closed can be suppressed, and load resistance and durability can be improved.

[0011] In the case of (3) above, since the contact surfaces of the wall portion and the support portion with each other are inclined surfaces, the wall portion can bite into the periphery of the hole of the support portion to ensure magnetic contact and suppress an increase in magnetic resistance.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0013] Hereinafter, the coil unit according to the embodiment of the present invention will be described with reference to the accompanying drawings. The coil unit 10 of the embodiment constitutes at least one of a power transmission device and a power receiving device of a non-contact power transmission system that supplies power to a moving body from the outside of the moving body, such as a vehicle, by non-contact power transmission. The vehicle is, for example, an electric vehicle such as an electric car, a hybrid vehicle, and a fuel cell vehicle. FIG. 1 is an exploded perspective view with the second cover 18 omitted in the coil unit 10 of the embodiment. FIG. 2 is a cross-sectional view taken along the line A-A shown in FIG. 1 by the Z-X plane with the magnetic resin members (back member 16 and inner member 17) omitted in the coil unit 10 of the embodiment.

[0014] Hereinafter, each axial direction of the X-axis, Y-axis, and Z-axis that are orthogonal to each other in a three-dimensional space is a direction parallel to each axis. For example, as shown in FIGS. 1 and 2, the Z-axis direction is parallel to the vertical direction of a moving body such as a vehicle on which the coil unit 10 is mounted, the X-axis direction is parallel to the front-rear direction of the moving body, and the Y-axis direction is parallel to the left-right direction of the moving body. For example, the positive direction of the Z-axis is the upward direction of the moving body, the positive direction of the X-axis is the forward direction of the moving body, and the positive direction of the Y-axis is the rightward direction of the moving body.

[0015] The coil unit 10 of the embodiment shown in FIGS. 1 and 2 constitutes, for example, a part of a power receiving device mounted on a moving body. The coil unit 10 includes, for example, a housing 11, a first cover 12, a coil 13, an insulating member 14, a core member 15, a back member 16, an inner member 17, and a second cover 18.

[0016] The outer shape of the housing 11 is formed, for example, in a rectangular frame shape. The housing 11 is formed of a material such as resin having a predetermined thermal conductivity, for example. The housing 11 includes, for example, a first accommodating portion 21 and a second accommodating portion 22. In the first accommodating portion 21, the coil 13, the insulating member 14, and the core member 15, which will be described later, are arranged. In the second accommodating portion 22, the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28, which will be described later, are arranged. The first accommodating portion 21 is provided so as to surround, for example, the coil 13, the insulating member 14, and the core member 15 in the downward direction in the vertical direction and the inner side and the outer side in the direction orthogonal to the vertical direction. The second accommodating portion 22 is provided, for example, on the rear side of the first accommodating portion 21 in the front-rear direction. The second accommodating portion 22 is provided so as to surround, for example, the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 in the upward direction in the vertical direction and the outer side in the direction orthogonal to the vertical direction.

[0017] The housing 11 includes, for example, a first surface 11A in which a plurality of grooves 11a are formed in the first accommodating portion 21. The first surface (that is, the lower surface which is the lower side surface in the vertical direction) 11A of the housing 11 is exposed to the outside below the moving body. The plurality of grooves 11a are formed, for example, along the front-rear direction so as to be along the flow direction of the wind (running wind, etc.) received when the moving body moves. The housing 11 includes, for example, a plurality of heat dissipation members 11b protruding inward from the first inner surface 11B on the back side with respect to the first surface 11A. The outer shape of the heat dissipation member 11b is, for example, a plate-shaped fin type. The plurality of heat dissipation members 11b are in contact with the coil 13.

[0018] The outer shape of the first cover 12 is formed, for example, in a rectangular plate shape with a through hole 12a formed in the thickness direction. The first cover 12 is provided, for example, so as to surround the upper side in the vertical direction with respect to the coil 13, the insulating member 14, and the core member 15 described later. The first cover 12 forms an accommodation space in which the coil 13, the insulating member 14, and the core member 15 are accommodated between the first inner surface 11B of the housing 11. The first cover 12 closes the opening end of the first accommodation portion 21 of the housing 11 in which the coil 13, the insulating member 14, and the core member 15 are accommodated.

[0019] The outer shape of the coil 13 is formed, for example, in a rectangular spiral shape along the first inner surface 11B of the housing 11. The coil 13 is arranged, for example, on the upper side of the first inner surface 11B. The wire of the coil 13 is in direct contact with a plurality of heat dissipation members 11b. The outer shape of the insulating member 14 is formed, for example, in a rectangular sheet shape with a through hole 14a formed in the thickness direction. The insulating member 14 is formed of a material having electrical insulation properties. The insulating member 14 is arranged, for example, on the upper side of the coil 13. The outer shape of the core member 15 is formed, for example, in a rectangular plate shape with a through hole 15a formed in the thickness direction. The core member 15 is formed of a material of a magnetic resin having a relatively high magnetic permeability, for example. The core member 15 is arranged, for example, on the upper side of the insulating member 14.

[0020] The outer shape of the back member 16 is formed, for example, in a rectangular plate shape with a through hole formed in the thickness direction. The outer shape of the inner member 17 is formed, for example, in a box shape that closes the opening of the through hole of the back member 16. The back member 16 and the inner member 17 are integrally formed of a material of a magnetic resin having a relatively high magnetic permeability, for example. Details of the back member 16 and the inner member 17 will be described later.

[0021] The outer shape of the second cover 18 is formed, for example, in a rectangular plate shape. The second cover 18 is provided so as to surround the lower side in the vertical direction with respect to each of the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 described later. The second cover 18 forms a housing space in which the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 are housed between the second inner surface 11C of the second housing portion 22 of the housing 11. The second cover 18 closes the opening end of the second housing portion 22 of the housing 11 in which the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 are housed.

[0022] The capacitor substrate 23 fixes a plurality of capacitors 24 such as film capacitors. The capacitor 24 is, for example, a capacitor (condenser) for resonance connected to the coil 13. The plurality of capacitors 24 are fixed to the capacitor substrate 23 and contact the inner surface of the second cover 18 via a heat conductive material 25 such as a thermal compound.

[0023] The control board 26 is arranged, for example, above the capacitor board 23. The control board 26 controls, for example, the power conversion of the power receiving device and communication with an external power transmission device. The control board 26 is a software functional unit that functions when a predetermined program is executed by a processor such as a CPU (Central Processing Unit). The software functional unit is an ECU (Electronic Control Unit) including a processor such as a CPU, a ROM (Read Only Memory) for storing a program, a RAM (Random Access Memory) for temporarily storing data, and an electronic circuit such as a timer. Note that at least a part of the control board 26 may be an integrated circuit such as an LSI (Large Scale Integration). The control board 26 generates, for example, a control signal to be input to the gate drive board 27 according to the target output of the power receiving device or the like. The control signal is, for example, a signal indicating the timing for driving a plurality of switching elements constituting the power conversion unit of the power receiving device on (conducting) / off (blocking). For example, the control signal is a pulse width modulated signal or the like.

[0024] The gate drive board 27 is arranged, for example, above the control board 26. The gate drive board 27 is connected to the gates of a plurality of switching elements that constitute the power conversion unit of the power receiving device. The gate drive board 27 includes, for example, an integrated circuit and a plurality of gate resistors. Based on the control signal received from the control board 26, the gate drive board 27 generates a gate signal for actually driving each switching element to be on (conductive) / off (blocked). For example, the gate drive board 27 generates a gate signal by performing amplification and level shift of the control signal.

[0025] The semiconductor element 28 is, for example, a switching element and a rectifying element that constitute the power conversion unit of the power receiving device. The switching element is, for example, a transistor such as a MOSFET (Metal Oxide Semi-conductor Field Effect Transistor) of SiC (Silicon Carbide). The rectifying element is, for example, a freewheeling diode connected in parallel to each transistor. The plurality of semiconductor elements 28 are fixed, for example, on the upper part of the gate drive board 27 and are arranged between the gate drive board 27 and the second inner surface 11C of the housing 11.

[0026] The housing 11 includes a radiator 29 arranged on the outer surface (second surface) 11D opposite to the second inner surface 11C. The radiator 29 is, for example, a heat sink having a plurality of fin members protruding to the outside. The housing 11 is connected to, for example, the power conversion unit of the power receiving device and includes a DC connector 30 protruding from the second surface 11D to the outside (upward).

[0027] FIG. 3 is a diagram showing the configuration of the power transmission side unit T including the coil unit 10 of the embodiment. The coil unit 10 of the embodiment shown in FIG. 3 constitutes a part of a power transmission device installed, for example, on a vehicle traveling road or the like. The coil unit 10 shown in FIG. 3 is fixed, for example, to the lid MC of a square tubular manhole MH buried underground such as a vehicle running road. The coil unit 10 is suspended, for example, by an appropriate fastening member or elastic member or the like on the lower surface (back surface) of the lid MC. The lid MC of the manhole MH is formed of, for example, a resin material and a fiber material or the like. The lid MC closes the upper opening end E of the manhole MH. In the internal space H of the manhole MH, various devices and members constituting a power transmission device of a non-contact power transmission system are accommodated, for example.

[0028] Since the coil unit 10 shown in FIG. 3 is fixed to the lower surface (back surface) of the lid MC of the manhole MH, it is taken out from the internal space H of the manhole MH when the lid MC is removed from the upper opening end E of the manhole MH. When the internal space of the manhole MH is opened to the outside by removing the lid MC, various devices and members accommodated in the internal space H of the manhole MH are exposed to the outside. The box-shaped inner member 17 in the coil unit 10 shown in FIG. 3 is inserted, for example, into a through hole in the thickness direction of the lid MC of the manhole MH. A part of the upper surface of the inner member 17 is exposed to the outside from the surface of the lid MC of the manhole MH, for example, and forms the same plane as the surface of the lid MC and the road surface such as a running road.

[0029] FIG. 4 is a cross-sectional view showing the magnetic resin members (back member 16 and inner member 17) of the power receiving side coil unit 10 in the embodiment. FIG. 5 is a cross-sectional view showing the magnetic resin members (back member 16 and inner member 17) of the power transmitting side coil unit 10 in the embodiment. As shown in FIGS. 4 and 5, the magnetic resin members of the coil unit 10 (that is, the back member 16 and the inner member 17) are arranged, for example, on the rear side of the coil 13 when viewed from the opposite side when the power transmitting side and the power receiving side face each other. For example, the magnetic resin members (back member 16 and inner member 17) on the power receiving side are arranged on the rear side of the coil 13 on the power receiving side when viewed from the power transmitting side, and the magnetic resin members (back member 16 and inner member 17) on the power transmitting side are arranged on the rear side of the coil 13 on the power transmitting side when viewed from the power receiving side.

[0030] As shown in FIGS. 4 and 5, the back member 16 is, for example, a plate-like member in which a through-hole 16H penetrating in the axial direction along the central axis O of the coil 13 is formed. The back member 16 includes, for example, a protruding portion 16b that protrudes in the axial direction from the peripheral edge portion 16a of the through-hole 16H and supports the inner member 17. The protruding portion 16b protrudes, for example, toward the opposite sides on the power transmission side and the power reception side facing each other in the axial direction. Of the two surfaces of the protruding portion 16b in the direction orthogonal to the axial direction, the inner surface 16A on the side of the through-hole 16H (that is, the inner side) is, for example, an inclined surface inclined at a predetermined angle θ with respect to the axial direction. On the inner surface 16A, for example, as going from the proximal end side (near-end side) to the distal end side (far-end side) in the protruding direction along the axial direction, the position in the direction orthogonal to the axial direction gradually changes outward (that is, to the side opposite to the through-hole 16H side).

[0031] The inner member 17 is, for example, a box-shaped member that protrudes in the axial direction from the peripheral edge portion 16a of the through-hole 16H of the back member 16. The inner member 17 includes, for example, a frame-shaped wall portion that protrudes from the peripheral edge portion 16a and is disposed in the hollow region 13a of the coil 13, and a flat lid portion that opens and closes the protruding-side opening end of the wall portion. For example, the inner member 17 on the power reception side includes a power reception side wall portion 41 and a power reception side lid portion 43. For example, the inner member 17 on the power transmission side includes a power transmission side wall portion 51 and a power transmission side lid portion 53. For example, in terms of the outer shape of the power reception side wall portion 41 and the power transmission side wall portion 51, the lengths along the axial direction are different, and the shapes of both axial ends in contact with the back member 16 and each lid portion 43, 53 are the same. For example, the length of the power reception side wall portion 41 along the axial direction is set according to the thickness of the coil 13 in the axial direction and the like. For example, the length of the power transmission side wall portion 51 along the axial direction is set according to the thickness of a paving material such as concrete or asphalt that fixes the power transmission side unit T on a vehicle traveling road or the like. For example, in terms of the outer shape of the power reception side lid portion 43 and the power transmission side lid portion 53, the thicknesses along the axial direction are different, and the shapes of the outer edge portions in contact with each wall portion 41, 51 are substantially the same. For example, the thickness of the power reception side lid portion 43 along the axial direction is the thickness obtained by adding the thickness of the power transmission side lid portion 53 and the thickness of a surface layer member 55 described later.

[0032] Each of the wall portions 41, 51 includes, for example, lid support portions 41a, 51a that contact the respective lid portions 43, 53 on the tip side (distal end side) in the protruding direction, and first connection portions 41b, 51b and second connection portions 41c, 51c that contact the protruding portions 16b of the respective back members 16 on the base end side (proximal end side) in the protruding direction. Each of the lid support portions 41a, 51a protrudes inward in the direction orthogonal to the axial direction from the tip portion in the protruding direction of each of the wall portions 41, 51. Each of the lid support portions 41a, 51a forms, for example, the protruding side opening end of each of the wall portions 41, 51. The inner surfaces 41A, 51A of the lid support portions 41a, 51a that contact the respective lid portions 43, 53 are, for example, curved surfaces. The cross-sectional shape of each of the inner surfaces 41A, 51A (for example, the shape of the cross-section obtained by cutting each of the wall portions 41, 51 with a plane parallel to the central axis O) is, for example, S-shaped. On each of the inner surfaces 41A, 51A, for example, as going from the tip side (distal end side) to the base end side (proximal end side) in the protruding direction of each of the wall portions 41, 51, the position in the direction orthogonal to the axial direction gradually changes inward.

[0033] Each of the first connection portions 41b, 51b is, for example, the base end portion in the protruding direction of each of the wall portions 41, 51. The outer surfaces 41B, 51B of the first connection portions 41b, 51b that contact the inner surfaces 16A of the respective protruding portions 16b are, for example, inclined surfaces that are inclined at a predetermined angle θ with respect to the axial direction. On each of the outer surfaces 41B, 51B, for example, as going from the base end side (proximal end side) to the tip side (distal end side) in the protruding direction of each of the wall portions 41, 51, the position in the direction orthogonal to the axial direction gradually changes outward. Each of the second connection portions 41c, 51c protrudes outward in the direction orthogonal to the axial direction at a position shifted from the base end (proximal end) in the axial direction of each of the first connection portions 41b, 51b. Each of the second connection portions 41c, 51c contacts, for example, so as to abut against the protruding side tip of each of the protruding portions 16b.

[0034] Each lid portion 43, 53 includes, for example, connection portions 43a, 53a that contact the lid support portions 41a, 51a of the respective wall portions 41, 51. Each connection portion 43a, 53a is, for example, an outer edge portion in a direction orthogonal to the axial direction of each lid portion 43, 53. A part of each connection portion 43a, 53a protrudes, for example, from the flat plate-like portion of each lid portion 43, 53 along the axial direction toward the proximal end side (near end side) of each wall portion 41, 51. The outer surfaces 43A, 53A of the connection portions 43a, 53a that contact the inner surfaces 41A, 51A of the lid support portions 41a, 51a of the respective wall portions 41, 51 are, for example, curved surfaces. The cross-sectional shape of each outer surface 43A, 53A (for example, the shape of a cross-section obtained by cutting each lid portion 43, 53 with a plane parallel to the central axis O) is, for example, S-shaped. In each outer surface 43A, 53A, for example, as it goes from the distal end side (far end side) to the proximal end side (near end side) in the protruding direction of each wall portion 41, 51, the position in the direction orthogonal to the axial direction gradually changes inward.

[0035] For example, for drainage or the like, a slit penetrating in the axial direction is formed in the power receiving side lid portion 43 of the power receiving side inner member 17. The power transmitting side inner member 17 includes, for example, a surface layer member 55 that is arranged so as to be laminated on the surface of the power transmitting side lid portion 53, that is, the surface on the distal end side (far end side) in the protruding direction of the power transmitting side wall portion 51. The surface layer member 55 is formed of, for example, a resin material having relatively high frictional properties compared to the power transmitting side lid portion 53, such as polycarbonate.

[0036] As described above, according to the coil unit 10 of the embodiment, by providing the magnetic resin members (back member 16 and inner member 17) arranged on the rear side of the coil 13, it is possible to ensure robustness compared to the case of providing a magnetic member such as a ferrite core. For example, it is possible to suppress an increase in eddy current loss due to breakage or defect, etc., and the occurrence of ground fault and short circuit due to insulation layer breakdown through fragments. By providing the inner member 17 inserted into the hollow region 13a of the coil 13, the distribution of the main magnetic flux between the power transmission side and the power reception side can be expanded at the central portion in the direction orthogonal to the axial direction, and the core constant of the entire system can be improved. By improving the core constant, the main magnetic flux can be concentrated at the central portion, the increase in the magnetic flux density outside in the direction orthogonal to the axial direction can be suppressed, and the coupling coefficient can be improved.

[0037] By providing the lid portions (power reception side lid portion 43, power transmission side lid portion 53) that open and close the protruding side opening ends of the wall portions (power reception side wall portion 41, power transmission side wall portion 51), the hollow region formed by the wall portions can be easily exposed to the outside. For example, the ease of various maintenance operations can be improved for various devices and members arranged in the internal space communicating with the hollow region.

[0038] Since the contact surfaces (inner surfaces 41A, 51A, outer surfaces 43A, 53A) of the wall portion and the lid portion are curved surfaces, displacement due to vibration or the like can be suppressed, and for example, a change in the dielectric constant and a decrease in the coil performance due to the inflow of water or the like can be suppressed. Generation of biting or the like during opening and closing of the lid portion can be suppressed, and the load resistance and durability can be improved.

[0039] Since the contact surfaces (inner surface 16A, outer surfaces 41B, 51B) of the wall portions (power reception side wall portion 41, power transmission side wall portion 51) and the back member 16 are inclined surfaces, the wall portions bite into the peripheral edge portion 16a of the through hole 16H of the back member 16 to ensure magnetic contact, and an increase in the magnetic resistance can be suppressed.

[0040] (Modification example) In the above-described embodiment, the cross-sectional shapes of the inner surfaces 41A, 51A and the outer surfaces 43A, 53A are S-shaped, but the present invention is not limited thereto, and for example, other shaped curved surfaces such as concave curved surfaces or convex curved surfaces may be used.

[0041] Embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, as well as in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0042] 10... Coil unit, 13... Coil, 16... Back member (magnetic resin member), 16a... Peripheral edge (periphery), 16A... Inner surface (contact surface), 16H... Through hole, 17... Inner member (magnetic resin member), 41... Power receiving side wall portion (wall portion), 41A... Inner surface (contact surface), 41B... Outer surface (contact surface), 43... Power receiving side lid portion (lid portion), 43A... Outer surface (contact surface), 51... Power transmitting side wall portion (wall portion), 51A... Inner surface (contact surface), 51B... Outer surface (contact surface), 53... Power transmitting side lid portion (lid portion), 53A... Outer surface (contact surface), O... Central axis.

Claims

1. A coil for transmitting or receiving power by non-contact power transmission, A magnetic resin member disposed on the rear side of the coil as viewed from the other side when the power transmitting side and the power receiving side face each other Comprising The magnetic resin member A plate-shaped support portion in which a hole penetrating in the axial direction along the central axis of the coil is formed, A frame-shaped wall portion protruding in the axial direction from the periphery of the hole and disposed in the hollow region of the coil, A lid portion for opening and closing the protruding side opening end of the wall portion Comprising A coil unit.

2. The contact surfaces of the wall portion and the lid portion with each other are curved surfaces in which the positions in the direction orthogonal to the axial direction gradually change as the positions in the axial direction gradually change. The coil unit according to claim 1.

3. The contact surfaces of the wall portion and the support portion with each other are inclined surfaces inclined at a predetermined angle with respect to the axial direction. The coil unit according to claim 1 or claim 2.

Images