Coil unit

Abstract

The invention provides a coil unit. The coil unit includes a coil and a magnetic resin member (a back member and an inner member). The magnetic resin members (a back member and an inner member) are disposed on the rear side of the coil when viewed from the opposite side when the power transmission side and the power reception side face each other. A through hole penetrating in the axial direction is formed in the plate-shaped back-side member, and the axial direction is along the central axis of the coil. A frame-shaped wall portion (a power receiving side wall portion or a power transmitting side wall portion) of the inner member protrudes in an axial direction from a peripheral edge portion of the through hole and is disposed in a hollow core region of the coil. A cover part (a power receiving side cover part or a power transmitting side cover part) of the inner member opens and closes a protruding side opening end of a wall part (a power receiving side wall part or a power transmitting side wall part).

Description

Technical Field

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

[0002] In recent years, more people are conducting research and development related to charging and power supply in vehicles equipped with secondary batteries, which contributes to the efficiency improvement of energy, in order to ensure the use of convenient, reliable, sustainable, and advanced energy.

[0003] Conventionally, in a non-contact power transmission system that supplies power from the outside of a vehicle to the vehicle by non-contact power transmission, a coil device including a coil and a magnetic flux conductor disposed on the inner side and the back side of the coil is known (for example, refer to Patent Document 1 below).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2015-15452 Summary of the Invention

[0007] In technologies related to charging and power supply in vehicles equipped with secondary batteries, in non-contact power transmission, it is desired to ensure the desired maintainability and firmness in each unit on the power transmission side and the power reception side, and at the same time reduce the magnetic flux other than the main magnetic flux (leakage magnetic flux) to increase the coupling coefficient. For example, if a magnetic flux conductor is formed only by a magnetic core portion and a flat plate portion made of a magnetic material and a resin as in the coil device of the above prior art, it is impossible to improve both maintainability and firmness, and there is a problem that the versatility of each unit cannot be ensured and the coupling coefficient cannot be increased.

[0008] The solution of the present invention is proposed in view of such a situation, and its object is to provide a coil unit that can ensure the maintainability and firmness of each unit on the power transmission side and the power reception side of non-contact power transmission and at the same time increase the coupling coefficient. Furthermore, it contributes to the efficiency improvement of energy.

[0009] In order to solve the above problems and achieve the above object, the present invention adopts the following solutions.

[0010] (1): A coil unit according to one embodiment of the present invention includes: a coil that transmits or receives power through non-contact power transmission; and a magnetic resin member that is disposed on the rear side of the coil when the power transmission side and the power reception side face each other, and when viewed from the other side. The magnetic resin member includes: a plate-shaped support portion formed with a hole penetrating in the axial direction, the axial direction being along the central axis of the coil; a frame-shaped wall portion that protrudes from the periphery of the hole in the axial direction and is disposed in the hollow region of the coil; and a cover portion that opens and closes the open end on the protruding side of the wall portion.

[0011] (2): In the above aspect (1), it may also be that the mutual contact surface between the wall portion and the cover portion is a curved surface, and the position in the direction orthogonal to the axial direction gradually changes as the position in the axial direction gradually changes.

[0012] (3): In the above aspect (1) or (2), it may also be that the mutual contact surface between the wall portion and the support portion is an inclined surface inclined at a prescribed angle with respect to the axial direction.

[0013] According to the above aspect (1), by providing a magnetic resin member disposed on the rear side of the coil, for example, compared with the case of providing a magnetic member such as a ferrite core, firmness can be ensured. For example, an increase in eddy current loss caused by breakage or defect and the occurrence of grounding and short circuit caused by insulation layer damage due to debris can be suppressed.

[0014] The magnetic resin member can expand the distribution of the main magnetic flux between the power transmission side and the power reception side at the central portion in the direction orthogonal to the axial direction by providing a wall portion and a cover portion inserted into the hollow region of the coil, and can improve the core constant of the system as a whole. By increasing the core constant, the main magnetic flux can be concentrated at the central portion, an increase in the magnetic flux density outside the direction orthogonal to the axial direction can be suppressed, and the coupling coefficient can be increased.

[0015] By providing a cover portion that opens and closes the open end on the protruding side of the wall portion, the hollow region formed by the wall portion can be easily exposed to the outside. For example, for various devices and components disposed in the internal space communicating with the hollow region, the ease of various maintenance operations can be improved.

[0016] In the case of the above aspect (2), since the mutual contact surface between the wall portion and the cover portion is a curved surface, misalignment caused by vibration or the like can be suppressed. For example, a change in the dielectric constant and a decrease in the coil performance caused by the inflow of water or the like can be suppressed. The occurrence of jamming or the like when the cover portion is opened and closed can be suppressed, and the load resistance and durability can be improved.

[0017] In the case of the above-described solution (3), the mutual contact surface between the wall portion and the support portion is an inclined surface. Thus, the wall portion is inserted into the periphery of the hole of the support portion to ensure magnetic contact, and an increase in magnetic resistance can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is an exploded perspective view showing the structure of a coil unit in an embodiment of the present invention.

[0019] Figure 2 FIG. is a cross-sectional view taken along the line A-A shown in FIG. with the magnetic resin members in the coil unit of the embodiment of the present invention omitted and cut by a Z-X plane at the position of the line A-A. Figure 1 FIG. is a cross-sectional view taken along the line A-A shown in FIG. with the magnetic resin members in the coil unit of the embodiment of the present invention omitted and cut by a Z-X plane at the position of the line A-A.

[0020] Figure 3 FIG. is a view showing the structure of a power transmission side unit including the coil unit of the embodiment of the present invention.

[0021] Figure 4 FIG. is a cross-sectional view showing a magnetic resin member of a power receiving side coil unit in an embodiment of the present invention.

[0022] Figure 5 FIG. is a cross-sectional view showing a magnetic resin member of a power transmission side coil unit in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, a coil unit according to an embodiment of the present invention will be described with reference to the drawings.

[0024] 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 from the outside of a moving body such as a vehicle to the moving body by non-contact power transmission. The vehicle is, for example, an electric vehicle such as a motor vehicle, a hybrid vehicle, and a fuel cell vehicle.

[0025] Figure 1 FIG. is an exploded perspective view of the coil unit 10 of the embodiment with the second cover 18 omitted. Figure 2 FIG. is a cross-sectional view taken along the line A-A shown in FIG. with the magnetic resin members (the back side member 16 and the inner side member 17) in the coil unit 10 of the embodiment omitted and cut by a Z-X plane at the position of the line A-A. Figure 1 FIG. is a cross-sectional view taken along the line A-A shown in FIG. with the magnetic resin members (the back side member 16 and the inner side member 17) in the coil unit 10 of the embodiment omitted and cut by a Z-X plane at the position of the line A-A.

[0026] Hereinafter, the directions of the X-axis, Y-axis, and Z-axis that are orthogonal to each other in a three-dimensional space are directions parallel to the respective axes. For example Figures 1 to 2As shown, the Z-axis direction is parallel to the up-and-down 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-and-back direction of the moving body, and the Y-axis direction is parallel to the left-and-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.

[0027] Figure 1 and Figure 2 The coil unit 10 of the embodiment shown, for example, forms a part of a power receiving device mounted on a moving body.

[0028] The coil unit 10 includes, for example, a housing 11, a first cover 12, a coil 13, an insulating member 14, a magnetic core member 15, a back member 16, an inner member 17, and a second cover 18.

[0029] 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. The housing 11 includes, for example, a first accommodation portion 21 and a second accommodation portion 22. The coil 13, the insulating member 14, and the magnetic core member 15 described later are arranged in the first accommodation portion 21. The substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 described later are arranged in the second accommodation portion 22. The first accommodation portion 21 is provided so as to surround the lower side in the up-and-down direction and the inner and outer sides in the direction orthogonal to the up-and-down direction with respect to the coil 13, the insulating member 14, and the magnetic core member 15 described later. The second accommodation portion 22 is provided at a position rearward of the first accommodation portion 21 in the front-and-back direction. The second accommodation portion 22 is provided so as to surround the upper side in the up-and-down direction and the outer side in the direction orthogonal to the up-and-down direction with respect to the substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 described later.

[0030] The housing 11 includes, for example, a first surface 11A in which a plurality of grooves 11a are formed in the first accommodation portion 21. The first surface (i.e., the lower surface which is the lower side surface in the up-and-down 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-and-back direction so as to follow the flow direction of the wind (traveling wind, etc.) received during the movement of the moving body.

[0031] The housing 11 includes, for example, a plurality of heat dissipation members 11b protruding inward from a first inner surface 11B on the inner side of the first surface 11A. The outer shape of the heat dissipation members 11b is, for example, a plate-shaped fin type. The plurality of heat dissipation members 11b are in contact with the coil 13.

[0032] 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 magnetic core member 15 described later. The first cover 12 forms a housing space for housing the coil 13, the insulating member 14, and the magnetic core member 15 between it and the first inner surface 11B of the housing 11. The first cover 12 closes the open end of the first housing portion 21 of the housing 11 that houses the coil 13, the insulating member 14, and the magnetic core member 15.

[0033] 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 material of the coil 13 is in direct contact with a plurality of heat dissipation members 11b.

[0034] 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.

[0035] The outer shape of the magnetic core member 15 is formed, for example, in a rectangular plate shape with a through hole 15a formed in the thickness direction. The magnetic core member 15 is formed, for example, of a magnetic resin material having a relatively large magnetic permeability. The magnetic core member 15 is arranged, for example, on the upper side of the insulating member 14.

[0036] The outer shape of the back side 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 side member 17 is formed, for example, in a box shape that closes the opening of the through hole of the back side member 16. The back side member 16 and the inner side member 17 are integrally formed, for example, of a magnetic resin material having a relatively large magnetic permeability. Details of the back side member 16 and the inner side member 17 will be described later.

[0037] The outer shape of the second cover 18 is formed, for example, in a rectangular plate shape. The second cover 18 is provided, for example, so as to surround the lower side in the vertical direction with respect to the respective substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 described later. The second cover 18 forms a housing space for housing the respective substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28 between it and the second inner surface 11C of the second housing portion 22 of the housing 11. The second cover 18 closes the open end of the second housing portion 22 of the housing 11 that houses the respective substrates 23, 26, 27, the capacitor 24, and the semiconductor element 28.

[0038] The capacitor substrate 23 fixes, for example, a plurality of capacitors 24 such as thin film capacitors. The capacitor 24 is, for example, a resonance capacitor (condenser) or the like connected to the coil 13. The plurality of capacitors 24 are fixed to the capacitor substrate 23 and are in contact with the inner surface of the second cover 18, for example, via a heat conduction member 25 such as thermal paste.

[0039] The control substrate 26 is disposed, for example, above the capacitor substrate 23. The control substrate 26 controls, for example, the power conversion of the power receiving device and the communication with an external power transmitting device. The control substrate 26 is a software functional unit that functions by executing a prescribed program using 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) that stores the program, a RAM (Random Access Memory) that temporarily stores data, and electronic circuits such as a timer. Note that at least a part of the control substrate 26 may be an integrated circuit such as an LSI (Large Scale Integration).

[0040] The control substrate 26 generates, for example, a control signal input to the gate drive substrate 27 based on the target output of the power receiving device or the like. The control signal is, for example, a signal indicating the timing of turning on (conducting) / turning off (interrupting) driving of a plurality of switching elements constituting the power conversion unit of the power receiving device. For example, the control signal is a signal subjected to pulse width modulation or the like.

[0041] The gate drive substrate 27 is disposed, for example, above the control substrate 26. The gate drive substrate 27 is connected to the gates of a plurality of switching elements constituting the power conversion unit of the power receiving device, for example. The gate drive substrate 27 includes, for example, an integrated circuit and a plurality of gate resistors or the like.

[0042] Based on the control signal received from the control substrate 26, the gate drive substrate 27 generates a gate signal for actually turning on (conducting) / turning off (interrupting) driving each switching element. For example, the gate drive substrate 27 executes amplification and level shift of the control signal or the like to generate the gate signal.

[0043] The semiconductor elements 28 are, for example, switching elements and rectifying elements constituting the power conversion unit of the power receiving device. The switching element is, for example, a transistor such as a SiC (Silicon Carbide) MOSFET (Metal Oxide Semi-conductor Field Effect Transistor). The rectifying element is, for example, a freewheeling diode connected in parallel with each transistor. A plurality of semiconductor elements 28 are fixed, for example, to the upper portion of the gate drive substrate 27 and are disposed between the gate drive substrate 27 and the second inner surface 11C of the housing 11.

[0044] The housing 11 includes a heat sink 29 disposed on the outer surface (second surface) 11D on the opposite side with respect to the second inner surface 11C. The heat sink 29 is, for example, a heat absorbing device including a plurality of fin members protruding to the outside.

[0045] The housing 11 is provided with, for example, a DC connector 30 that is connected to the power conversion unit of the power receiving device and protrudes outward (upward) from the second surface 11D.

[0046] Figure 3 It is a diagram showing the structure of the power transmission side unit T including the coil unit 10 of the embodiment. Figure 3 The coil unit 10 of the illustrated embodiment constitutes, for example, a part of a power transmission device provided on a vehicle traveling road or the like.

[0047] Figure 3 The illustrated coil unit 10 is fixed to, for example, the lid MC of a square tubular inspection hole MH buried underground on a vehicle traveling road or the like. The coil unit 10 is suspended, for example, from the lower surface (back surface) of the lid MC by an appropriate fastening member or elastic member. The lid MC of the inspection hole MH is formed of, for example, a resin material and a fiber material. The lid MC closes the upper opening end E of the inspection hole MH. In the internal space H of the inspection hole MH, various devices and components constituting a non-contact power transmission system are accommodated, for example.

[0048] Since Figure 3 the illustrated coil unit 10 is fixed to the lower surface (back surface) of the lid MC of the inspection hole MH, when the lid MC is removed from the upper opening end E of the inspection hole MH, the coil unit 10 is taken out from the internal space H of the inspection hole MH. When the internal space of the inspection hole MH is opened to the outside by removing the lid MC, various devices and components accommodated in the internal space H of the inspection hole MH are exposed to the outside.

[0049] Figure 3 The box-shaped inner member 17 in the illustrated coil unit 10 is inserted into, for example, a through hole in the thickness direction of the lid MC of the inspection hole MH. A part of the upper surface of the inner member 17 protrudes from the surface of the lid MC of the inspection hole MH to the outside, forming a plane flush with the surface of the lid MC and the road surface such as the traveling road.

[0050] Figure 4 It is a cross-sectional view showing the magnetic resin members (the back member 16 and the inner member 17) of the power receiving side coil unit 10 in the embodiment. Figure 5 It is a cross-sectional view showing the magnetic resin members (the back member 16 and the inner member 17) of the power transmission side coil unit 10 in the embodiment. As Figure 4 and Figure 5As shown, the magnetic resin members (i.e., the back member 16 and the inner member 17) of the coil unit 10 are arranged on the rear side of the coil 13 when viewed from the other side, for example, when the power transmission side and the power reception side face each other. For example, when viewed from the power transmission side, the magnetic resin members (the back member 16 and the inner member 17) on the power reception side are arranged on the rear side of the coil 13 on the power reception side, and when viewed from the power reception side, the magnetic resin members (the back member 16 and the inner member 17) on the power transmission side are arranged on the rear side of the coil 13 on the power transmission side.

[0051] As Figure 4 and Figure 5 shown, the back member 16 is, for example, a plate-like member formed with a through hole 16H penetrating in the axial direction, where the axial direction is along the central axis O of the coil 13. The back member 16 includes, for example, a protruding portion 16b that protrudes in the axial direction from the peripheral portion 16a of the through hole 16H and supports the inner member 17. The protruding portion 16b protrudes, for example, toward the other side of the power transmission side and the power reception side facing each other in the axial direction. The inner surface 16A on the side of the through hole 16H (i.e., the inner side) of the two surfaces of the protruding portion 16b in the direction orthogonal to the axial direction is, for example, an inclined surface inclined at a prescribed angle θ with respect to the axial direction. In the inner surface 16A, for example, as going from the proximal end side (near-end side) in the protruding direction along the axial direction toward the distal end side (far-end side), the position in the direction orthogonal to the axial direction gradually changes outward (i.e., the side opposite to the through hole 16H side).

[0052] The inner member 17 is, for example, a box-shaped member that protrudes from the peripheral portion 16a of the through hole 16H of the back member 16 in the axial direction. The inner member 17 includes, for example, a frame-shaped wall portion that protrudes from the peripheral portion 16a and is arranged in the hollow region 13a of the coil 13, and a flat plate-shaped cover portion that opens and closes the protruding side opening end of the wall portion. For example, the inner member 17 on the power receiving side includes a power receiving side wall portion 41 and a power receiving side cover portion 43. For example, the inner member 17 on the power transmitting side includes a power transmitting side wall portion 51 and a power transmitting side cover portion 53. For example, in the outer shapes of the power receiving side wall portion 41 and the power transmitting side wall portion 51, the lengths along the axial direction are different, and the shapes of the two ends in the axial direction that are connected to the back member 16 and the respective covers 43, 53 are the same. For example, the length of the power receiving side wall portion 41 along the axial direction is set according to the thickness of the coil 13 in the axial direction, etc. For example, the length of the power transmission side wall portion 51 along the axial direction is set according to the thickness of the paving material such as concrete or asphalt to which the power transmission side unit T is fixed on the vehicle running road, etc. For example, in the outer shapes of the power receiving side cover portion 43 and the power transmission side cover portion 53, the thickness along the axial direction is different, and the shape of the outer edge portion in contact with each wall portion 41, 51 is roughly the same. For example, the thickness of the power receiving side cover portion 43 along the axial direction is the thickness obtained by adding the thickness of the power transmission side cover portion 53 along the axial direction to the thickness of the surface layer member 55 described later.

[0053] Each wall portion 41, 51 has, for example: each cover support portion 41a, 51a connected to each cover portion 43, 53 at the front end side (distal end side) of the protruding direction; and each first connection portion 41b, 51b and each second connection portion 41c, 51c connected to the protruding portion 16b of each back member 16 at the base end side (proximal end side) of the protruding direction.

[0054] Each cover support portion 41a, 51a protrudes from, for example, the front end portion in the protruding direction of each wall portion 41, 51 to the inner side in the direction orthogonal to the axial direction. Each cover support portion 41a, 51a forms, for example, the protruding side opening end of each wall portion 41, 51. The inner surface 41A, 51A of each cover support portion 41a, 51a connected to each cover portion 43, 53 is, for example, a curved surface. The cross-sectional shape of each inner surface 41A, 51A (for example, the shape of the cross section obtained by cutting each wall portion 41, 51 by a plane parallel to the central axis O) is, for example, S-shaped. In each inner surface 41A, 51A, for example, as it moves from the front end side (distal end side) in the protruding direction of each wall portion 41, 51 toward the base end side (proximal end side), the position in the direction orthogonal to the axial direction gradually changes inward.

[0055] Each first connection portion 41b, 51b is, for example, a base end portion in the protruding direction of each wall portion 41, 51. The outer surface 41B, 51B of each first connection portion 41b, 51b in contact with the inner surface 16A of each protruding portion 16b is, for example, an inclined surface inclined at a predetermined angle θ relative to the axial direction. In each outer surface 41B, 51B, for example, the position in the direction orthogonal to the axial direction gradually changes outward as it moves from the base end side (proximal end side) in the protruding direction of each wall portion 41, 51 toward the distal end side (distal end side).

[0056] Each second connection portion 41c, 51c protrudes outward in a direction orthogonal to the axial direction, for example, at a position offset from the base end (proximal end) of each first connection portion 41b, 51b in the axial direction. Each second connection portion 41c, 51c is connected to, for example, the protruding side front end of each protrusion 16b in abutment.

[0057] Each cover part 43, 53 includes, for example, each connection part 43a, 53a connected to the cover support part 41a, 51a of each wall part 41, 51. Each connection part 43a, 53a is, for example, an outer edge part in a direction orthogonal to the axial direction of each cover part 43, 53. A part of each connection part 43a, 53a protrudes from, for example, a flat plate-shaped part of each cover part 43, 53 toward the base end side (proximal end side) of each wall part 41, 51 along the axial direction. The outer surface 43A, 53A of each connection part 43a, 53a connected to the inner surface 41A, 51A of the cover support part 41a, 51a of each wall part 41, 51 is, for example, a curved surface. The cross-sectional shape of each outer surface 43A, 53A (for example, the shape of the cross section obtained by cutting each cover part 43, 53 by a plane parallel to the central axis O) is, for example, an S-shape. In each outer surface 43A, 53A, for example, the position in the direction perpendicular to the axial direction gradually changes inward as it moves from the front end side (distal end side) toward the base end side (proximal end side) in the protruding direction of each wall portion 41, 51.

[0058] The power receiving side cover portion 43 of the power receiving side inner member 17 is formed with a slit penetrating in the axial direction for the purpose of drainage, for example.

[0059] The inner member 17 on the power transmission side includes, for example, a surface member 55 which is arranged in a manner of being stacked on the surface of the power transmission side cover portion 53, that is, the surface on the front end side (distal end side) in the protruding direction of the power transmission side wall portion 51. The surface member 55 is formed of, for example, a resin material such as polycarbonate having relatively greater friction than the power transmission side cover portion 53.

[0060] As described above, according to the coil unit 10 of the embodiment, by providing magnetic resin members (the back member 16 and the inner member 17) disposed on the rear side of the coil 13, it is possible to ensure firmness, for example, as compared with 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 caused by breakage or defect, and the occurrence of grounding and short - circuit due to insulation layer damage caused by debris.

[0061] By providing the inner member 17 inserted into the hollow region 13a of the coil 13, it is possible to expand the distribution of the main magnetic flux between the power - transmitting side and the power - receiving side at the central portion in the direction orthogonal to the axial direction, and to improve the core constant of the system as a whole. By increasing the core constant, it is possible to concentrate the main magnetic flux on the central portion, suppress an increase in the magnetic flux density outside in the direction orthogonal to the axial direction, and improve the coupling coefficient.

[0062] By providing lid portions (the power - receiving side lid portion 43 and the power - transmitting side lid portion 53) that open and close the protruding side open ends of the wall portions (the power - receiving side wall portion 41 and the power - transmitting side wall portion 51), it is possible to easily expose the hollow region formed by the wall portions to the outside. For example, for various devices and components arranged in the internal space communicating with the hollow region, it is possible to improve the ease of various maintenance operations.

[0063] Since the mutual contact surfaces (the inner surfaces 41A, 51A, the outer surfaces 43A, 53A) of the wall portion and the lid portion are curved surfaces, it is possible to suppress misalignment caused by vibration or the like. For example, it is possible to suppress a change in the dielectric constant and a decrease in the coil performance caused by the inflow of water or the like. It is possible to suppress the occurrence of jamming when the lid portion is opened and closed, and to improve the load resistance and durability.

[0064] The mutual contact surfaces (the inner surface 16A, the outer surfaces 41B, 51B) of the wall portion (the power - receiving side wall portion 41 and the power - transmitting side wall portion 51) and the back member 16 are inclined surfaces. Thus, the wall portion is inserted into the peripheral portion 16a of the through - hole 16H of the back member 16 to ensure magnetic contact, and it is possible to suppress an increase in magnetic resistance.

[0065] (Modification example)

[0066] In the above - mentioned embodiment, the cross - sectional shapes of the inner surfaces 41A, 51A and the outer surfaces 43A, 53A are S - shaped, but it is not limited thereto. For example, they may be other shaped curved surfaces such as concave curved surfaces or convex curved surfaces.

[0067] The embodiments of the present invention are presented as example embodiments and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, 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, and are also included in the invention described in the claims and its equivalents.

Claims

1. A coil unit, wherein: The coil unit comprises: a coil that sends or receives power through contactless power transmission; and a magnetic resin member disposed on the rear side of the coil when viewed from the other side when the power transmission side and the power reception side face each other; The magnetic resin member comprises: A plate-shaped support portion having a hole extending therethrough in an axial direction along a central axis of the coil; a frame-shaped wall portion, which protrudes from the periphery of the hole toward the axial direction and is arranged in the hollow region of the coil; as well as The cover portion opens and closes the protruding side opening end of the wall portion.

2. The coil unit according to claim 1, wherein: A contact surface between the wall portion and the cover portion is a curved surface, and a position of the curved surface in a direction perpendicular to the axial direction gradually changes as a position in the axial direction gradually changes.

3. The coil unit according to claim 1 or 2, wherein: A contact surface between the wall portion and the support portion is an inclined surface inclined at a predetermined angle with respect to the axial direction.

Images