JP2019004019A - Electric power transmission unit - Google Patents

Abstract

A power transmission unit capable of easily defining the relative positions of components is provided.
A power transmission unit (1) defines relative positions of a substrate (10), a power transmission coil (20), and a ferrite (30) so as to be able to transmit power with a counterpart power transmission coil, And the inner case 60 with which the ferrite 30 is assembled | attached, and the outer case 70 which covers the board | substrate 10, the electric power transmission coil 20, and the inner case 60 with which the ferrite 30 was assembled | attached are provided.
[Selection] Figure 2

Description

  The present invention relates to a power transmission unit.

  Conventionally, there is a power transmission unit that transmits power without contact. The power transmission unit includes, for example, a power transmission coil that transmits power in a contactless manner, a ferrite, a substrate on which electronic components are mounted, and a housing (outer case). And the electric power transmission unit has accommodated these components including a power transmission coil, a ferrite, and a board | substrate in the housing | casing (for example, patent document 1). In the power transmission unit, for example, components are placed on the bottom surface of the housing and housed in the housing.

Japanese Patent Laid-Open No. 2006-1940

  By the way, in order to transmit electric power appropriately in a non-contact manner, the power transmission unit needs to specify the relative positions of the component parts and accommodate them in the housing, but there is room for further improvement in this respect.

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a power transmission unit that can easily define the relative positions of components.

  In order to solve the above-described problems and achieve the object, a power transmission unit according to the present invention includes a power transmission coil that transmits power in a contactless manner, and a circuit that is electrically connected to the power transmission coil. Defining a relative position of the substrate, the power transmission coil, and the magnetic member so as to be able to transmit power to the substrate, the magnetic member including the magnetic material provided in the power transmission coil, and the counterpart power transmission coil; An inner member to which the substrate, the power transmission coil, and the magnetic member are assembled, and an outer member that covers the substrate, the power transmission coil, and the inner member to which the magnetic member is assembled. It is characterized by.

  The power transmission unit may further include a shield member that shields the magnetic force of the power transmission coil and a communication unit that transmits and receives signals, and the inner member further communicates with the counterpart communication unit so that the shield It is preferable that the relative positions of the member and the communication unit are defined, and the shield member and the communication unit are assembled.

  In the power transmission unit, the communication unit and the shield member are formed in an annular shape around an axis, and the inner member is provided with a support plate provided so as to intersect the axis, and a support plate standing from the support plate. Provided in an annular shape around the axis, the communication portion is wound around the outer surface and mounted on the outer surface, and the shield member is mounted on the inner surface side, and on the inner side of the standing wall portion It is preferable to include a storage chamber that is provided and has a space, and stores the power transmission coil and the magnetic member in the space.

  Further, in the power transmission unit, the inner member holds the communication unit so that the communication unit surrounds the power transmission coil at a position along the crossing direction intersecting the axis, and the shield member in the crossing direction. It is preferable to hold the shield member so as to be positioned between the power transmission coil and the communication unit.

  Further, in the power transmission unit, the shield member includes a shield wall portion that is provided so as to surround the power transmission coil at a position along the intersecting direction, and shields the magnetic force generated by the power transmission coil. The wall portion is preferably formed so that the interval between the wall surfaces facing each other in the intersecting direction becomes wider from one side in the axial direction along the axis toward the other side.

  The power transmission unit according to the present invention defines the relative positions of the substrate, the power transmission coil, and the magnetic member so as to be able to transmit power with the counterpart power transmission coil, and the power transmission coil, the substrate, and the magnetic member are An inner member to be assembled, and an outer member that covers the inner member to which the power transmission coil, the substrate, and the magnetic member are assembled are provided. Thereby, the power transmission unit can accommodate the inner member in the outer member in a state where the components including the power transmission coil, the substrate, and the magnetic member are positioned and assembled to the inner member. As a result, the power transmission unit can easily define the relative positions of the component parts.

FIG. 1 is a perspective view illustrating a configuration example of a power transmission unit according to the embodiment. FIG. 2 is an exploded perspective view illustrating a configuration example of the power transmission unit according to the embodiment. FIG. 3 is a cross-sectional view taken along the line VV of FIG. FIG. 4 is a perspective view illustrating a configuration example of the power transmission unit in a state where the outer case according to the embodiment is removed. FIG. 5 is a cross-sectional view taken along line MM in FIG. 4 in the power transmission unit according to the embodiment. FIG. 6 is a cross-sectional view showing the power transmission unit on the power transmission side and the power reception side according to the embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the structures described below can be combined as appropriate. Various omissions, substitutions, or changes in the configuration can be made without departing from the scope of the present invention.

Embodiment
The power transmission unit 1 according to the embodiment will be described. The power transmission unit 1 is a unit that transmits power without contact and wirelessly communicates signals. The power transmission unit 1 functions as a power transmission side that transmits power or a power reception side that receives power. The power transmission unit 1 is used, for example, when charging a storage battery provided in a vehicle (not shown). In this case, the power transmission unit 1 on the power receiving side is installed, for example, on the bottom surface of the vehicle and connected to the storage battery of the vehicle. The power transmission unit 1 on the power transmission side is installed on the ground of a charging station (not shown) and connected to a power source, for example. The power transmission unit 1 on the power transmission side transmits the power supplied from the power source to the power transmission unit 1 on the power reception side by magnetic resonance or the like while facing the power transmission unit 1 on the power reception side. The power transmission unit 1 on the power receiving side receives the power transmitted from the power transmission unit 1 on the power transmission side, and outputs the received power to the storage battery of the vehicle. In the following description, the main configuration of the power transmission unit 1 is the same on the power transmission side and the power reception side. Therefore, the power transmission unit 1 will be described without distinguishing between the power transmission side and the power reception side unless otherwise specified.

  1 and 2, the power transmission unit 1 includes a substrate 10, a power transmission coil 20, a ferrite 30 as a magnetic member, a shield member 40, a communication coupler 50 as a communication unit, and an inner member. An inner case 60 and an outer case 70 as an outer member.

  Here, the axial direction is a direction along the axis X. The upper side in the axial direction is the power transmission coil 20 side, and the lower side in the axial direction is the substrate 10 side. The intersecting direction is a direction intersecting the axial direction. The orthogonal direction is a direction orthogonal to the axial direction.

  The substrate 10 is a so-called printed circuit board on which various electronic components 11 such as a resonance capacitor are mounted and constitutes an electronic circuit that electrically connects the electronic components 11. The substrate 10 has a wiring pattern (print pattern) formed of a conductive member such as copper foil on an insulating layer made of an insulating material such as epoxy resin, glass epoxy resin, paper epoxy resin, or ceramic. The substrate 10 is electrically connected to the power transmission coil 20.

  The power transmission coil 20 is a coil that transmits power without contact. The power transmission coil 20 forms an LC resonance circuit together with a resonance capacitor. The power transmission coil 20 includes, for example, a coil winding portion 22 in which the conductor wire 21 is provided in a spiral shape around the axis X, a winding start end portion 23 that is an end portion on the winding start side of the conductor wire 21, and a winding start. An intermediate portion 24 that is a portion between the end portion 23 and the coil winding portion 22 and a winding end portion 25 that is an end portion on the winding end side of the conductor wire 21 are provided. The conductor wire 21 is, for example, a litz wire obtained by twisting a plurality of conductor wires. The coil winding portion 22 is a portion formed in a spiral shape by being wound a plurality of times from the inside toward the outside along the intersecting direction intersecting the axial direction. Typically, the coil winding portion 22 is wound a plurality of times from the inside toward the outside along the orthogonal direction orthogonal to the axial direction. The intermediate portion 24 is a portion where the conductor wire 21 crosses from the inside to the outside of the coil winding portion 22. The intermediate portion 24 is compressed along the axial direction and is fixed to the coil winding portion 22 by an adhesive member. The winding start end portion 23 and the winding end end portion 25 are located outside the coil winding portion 22 when viewed from the axial direction. The winding start end portion 23 and the winding end end portion 25 are connected to the substrate 10.

  As shown in FIG. 3, the coil winding portion 22 has the conductor wire 21 compressed along the axial direction, and the conductor wire 21 is covered and fixed by an adhesive member. As a result, the coil winding portion 22 is formed in a plate shape in which the cross-sectional shape of the conductor wire 21 is deformed and the space between the adjacent conductor wires 21 is closed. As a result, in the power transmission coil 20, the axial thickness H1 of the coil winding portion 22 is greater than the outer diameter H2 (for example, WW cross section) of the winding start end portion 23 and the outer diameter H3 of the winding end end portion 25. Is also formed thin. Thereby, the power transmission coil 20 can suppress variations in the coil shape, and can reduce the tolerance of the inductance value. Therefore, the power transmission coil 20 can suppress variations in coil performance and ensure appropriate coil performance. Since the power transmission coil 20 is formed by winding a single conductor wire 21, the outer diameter H2 of the winding start end portion 23 and the outer diameter H3 of the winding end end portion 25 have the same thickness. is there.

  The ferrite 30 is a member including a magnetic material, and is, for example, a composite oxide of iron oxide and metal. The ferrite 30 is formed in a rectangular plate shape, for example, and is formed in a size equivalent to that of the power transmission coil 20. The ferrite 30 is provided in the power transmission coil 20 so as to face along the axial direction. The ferrite 30 controls the loss of magnetic force through the magnetic force generated by the power transmission coil 20.

  The shield member 40 is a member that shields extra magnetic force (leakage magnetic field) of the power transmission coil 20 that causes noise and the like. The shield member 40 is made of a highly conductive metal such as copper or aluminum. The shield member 40 includes a shield wall portion 41 formed in an annular shape around the axis X, and both sides in the axial direction are open. The shield wall 41 is formed, for example, by winding a long plate member around the axis X one turn. The shield wall portion 41 is formed in a substantially rectangular shape when viewed from the axial direction, and the four corner portions are rounded. As shown in FIGS. 4, 5, etc., the shield wall 41 is provided so as to surround the power transmission coil 20 and the ferrite 30 at a position along the intersecting direction. That is, the shield wall portion 41 is provided on the outside so as to surround the power transmission coil 20 and the ferrite 30, and is provided so as to overlap the power transmission coil 20 and the ferrite 30 when viewed from the crossing direction.

  The shield wall portion 41 is formed in a shape that spreads toward the counterpart power transmission coil 20A side. That is, the shield wall 41 is formed such that the interval P between the wall surfaces 41a facing each other in the intersecting direction becomes wider from one side (lower side) to the other side (upper side) in the axial direction (FIG. 5, (See FIG. 6). Thereby, the shield wall part 41 can suppress that the magnetic force line (magnetic flux line) of the power transmission coil 20 is orthogonal. Therefore, since the shield wall 41 can suppress the flow of eddy currents that generate a magnetic field that cancels the fluctuation of the magnetic field caused by the power transmission coil 20, it is possible to suppress a decrease in power transmission efficiency. Further, the shield wall 41 is formed in an arc shape in which a cross-sectional shape (cut portion 41 b) along the axial direction is curved to the outside of the shield wall 41. Thereby, the shield wall part 41 can suppress more that an eddy current flows.

  The communication coupler 50 is an antenna that transmits and receives signals. The communication coupler 50 is formed in an annular shape around the axis X. The communication coupler 50 is formed, for example, by winding the antenna wire 51 around the axis X a plurality of times (for example, three times) in a spiral shape. In the communication coupler 50, a first end portion 52 that is an end portion on the winding start side of the antenna line 51 and a second end portion 53 that is an end portion on the winding end side of the antenna line 51 are connected to the substrate 10. The communication coupler 50 is formed in a substantially rectangular shape when viewed from the axial direction. The communication coupler 50 is provided so as to surround the power transmission coil 20 at a position along the crossing direction. That is, the communication coupler 50 is located outside so as to surround the power transmission coil 20. The communication coupler 50 is provided with a shield member 40 between the power transmission coil 20 in the crossing direction.

  The inner case 60 is a member accommodated in the outer case 70. The inner case 60 is formed of an insulating synthetic resin or the like and is formed by a well-known injection molding. The inner case 60 defines the relative positions of the substrate 10, the power transmission coil 20, and the ferrite 30 so as to be able to transmit power to the counterpart power transmission coil 20 </ b> A, and further includes a counterpart communication coupler 50 </ b> A as a counterpart communication unit. The relative positions of the shield member 40 and the communication coupler 50 are defined so that communication is possible. In the inner case 60, the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 are assembled.

  The inner case 60 includes a support plate 61, a standing wall portion 62, and a storage chamber 63. The support plate 61 is provided so as to intersect the axis X. The standing wall portion 62 is erected from the support plate 61 and is annularly provided around the axis X. The standing wall 62 is formed in a substantially rectangular shape when viewed from the axial direction. The standing wall portion 62 has an outer shape that is the same as the inner shape of the communication coupler 50. The standing wall 62 is mounted with the communication coupler 50 by, for example, winding the communication coupler 50 around the outer surface. The standing wall portion 62 has an inner peripheral shape equivalent to the outer peripheral shape of the shield member 40. The standing wall portion 62 includes a curved support portion 62 a that supports the outer surface of the shield member 40 on the inner side. The standing wall portion 62 is mounted with the shield member 40 supported by the support portion 62a. For example, the standing wall portion 62 attaches the shield member 40 by attaching the shield member 40 to the support portion 62a with an adhesive tape or the like (not shown). The standing wall 62 is provided with a notch 61a at the upper edge in the axial direction. The notch 61a is formed by cutting a part of the upper edge of the standing wall 62 in the axial direction. Thereby, the notch part 61a can make a potting material and a molding material flow into the inner case 60 easily.

  The storage chamber 63 is formed in a rectangular parallelepiped shape and is provided inside the standing wall portion 62. The accommodation chamber 63 measures the temperature of the power transmission coil 20, the space 63 a for housing the power transmission coil 20, the insertion port 63 b for inserting the power transmission coil 20 into the space 63 a, and the outer case 70. And a mounting portion 63c to which a thermistor 11b for detecting foreign matter (for example, metallic foreign matter) present is attached. In the accommodation chamber 63, the power transmission coil 20 is inserted into the space 63a from the insertion port 63b, and the inserted power transmission coil 20 is accommodated in the space 63a. In the accommodation chamber 63, the thermistor 11b for measuring the temperature of the power transmission coil 20 accommodated in the space 63a and detecting foreign matter existing between the outer cases 70 is attached to the attachment portion 63c. The inner case 60 is configured so that a part 60a on the insertion port 63b side can be separated from the main body 60b so that the power transmission coil 20 can be inserted into the space 63a from the insertion port 63b.

  The outer case 70 is a housing that covers the inner case 60. The outer case 70 is formed of an insulating synthetic resin or the like, and is formed by a well-known injection molding. The outer case 70 includes, for example, an upper case 71 provided on the upper side in the axial direction and a lower case 72 provided on the lower side in the axial direction. The outer case 70 is formed in a box shape by assembling the upper case 71 and the lower case 72 in the axial direction. The outer case 70 is provided with a connector opening 73 that exposes the connector connecting portion 11 a provided on the substrate 10. The outer case 70 is a state in which the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 are assembled to the inner case 60, and the entire inner case 60 is covered by the upper case 71 and the lower case 72. cover.

  As described above, the power transmission unit 1 according to the embodiment defines the relative positions of the substrate 10, the power transmission coil 20, and the ferrite 30 so that power can be transmitted to the counterpart power transmission coil 20 </ b> A, and the substrate 10. , The inner case 60 to which the power transmission coil 20 and the ferrite 30 are assembled, and the outer case 70 that covers the substrate 10, the power transmission coil 20, and the inner case 60 to which the ferrite 30 is assembled. Thereby, the power transmission unit 1 accommodates the inner case 60 in the outer case 70 in a state where the components including the substrate 10, the power transmission coil 20, and the ferrite 30 are positioned and assembled to the inner case 60. be able to. Accordingly, the power transmission unit 1 can easily and accurately define the relative positions of the component parts and easily hold the component parts, as compared with, for example, the case where the component parts are directly assembled inside the outer case 70. be able to. Thereby, the power transmission unit 1 can also correctly define the relative position of the counterpart power transmission unit 1A with the components. Therefore, the power transmission unit 1 can suppress a decrease in power transmission efficiency.

  In the power transmission unit 1, the inner case 60 further defines the relative positions of the shield member 40 and the communication coupler 50 so that the inner case 60 can communicate with the counterpart communication coupler 50A, and the shield member 40 and the communication coupler 50 are assembled. It is done. Thereby, the power transmission unit 1 can further accommodate the inner case 60 in the outer case 70 in a state where the components including the shield member 40 and the communication coupler 50 are assembled to the inner case 60. Therefore, since the power transmission unit 1 can easily and accurately define the relative positions of the component parts and can easily hold the component parts, it is possible to suppress a decrease in communication quality.

  Further, in the power transmission unit 1, the inner case 60 is provided with a support plate 61 provided so as to intersect the axis X, and provided annularly around the axis X with the communication plate 50 wound around the outer surface. A standing wall portion 62 that is rotated and mounted on the outer surface and the shield member 40 is mounted on the inner surface side, and a space portion 63a provided on the inner side of the standing wall portion 62. A housing chamber 63 for housing the portion 63a. As a result, the inner case 60 can hold the shield member 40 and the communication coupler 50 by the standing wall portion 62, and can hold the power transmission coil 20 and the ferrite 30 by the accommodation chamber 63. In the inner case 60, the positions of the shield member 40 and the communication coupler 50 can be defined by the standing wall portion 62, and the positions of the power transmission coil 20 and the ferrite 30 can be defined by the accommodation chamber 63. For example, the inner case 60 can change the positional relationship between the shield member 40 and the communication coupler 50 in the crossing direction by changing the thickness of the standing wall 62 in the crossing direction.

  In the power transmission unit 1, the inner case 60 is assembled with the substrate 10 through a substantially cylindrical portion opposite to the standing wall portion 62 of the support plate 61. Thereby, the inner case 60 can prescribe | regulate the relative position of the electric power transmission coil 20, the communication coupler 50, and the board | substrate 10 by changing the length of the axial direction of a substantially cylindrical shape part.

  In the power transmission unit 1, the communication coupler 50 is provided so as to surround the power transmission coil 20, and the shield member 40 is provided between the power transmission coil 20 and the communication coupler 50 in the crossing direction. Thereby, the shield member 40 can suppress the magnetic force generated by the power transmission coil 20 from affecting the communication coupler 50. Therefore, the communication coupler 50 can suppress a change in characteristics and suppress a signal loss, so that it is possible to suppress a decrease in communication quality.

  In the power transmission unit 1, the shield member 40 includes a shield wall portion 41 that is provided so as to surround the power transmission coil 20 at a position along the intersecting direction and shields the magnetic force generated by the power transmission coil 20. And the shield wall part 41 is formed so that the space | interval P of the wall surface 41a which opposes a cross direction may become large toward the other side from the one side of an axial direction. Thereby, the shield member 40 can suppress that the magnetic force lines of the power transmission coil 20 and the wall surface 41a of the shield wall portion 41 are orthogonal to each other. Therefore, the shield member 40 can suppress the generation of eddy current, and can suppress a decrease in power transmission efficiency. Thus, the shield member 40 can suppress a reduction in power transmission efficiency with a simple configuration without adding other components. Further, the shield member 40 can suppress heat generation of the shield member 40.

[Modification]
Next, a modification of the embodiment will be described. Although the board | substrate 10 was demonstrated as what is a printed circuit board, it is not limited to this. For example, the substrate 10 may be an insert bus bar substrate or the like in which a conductive metal bus bar is built in an insulating resin material and various circuits are configured by the bus bar.

  Further, the power transmission coil 20 is not limited to a spiral shape. The power transmission coil 20 may be, for example, a so-called solenoid type power transmission coil. That is, the power transmission coil 20 may be a power transmission coil that is spirally wound around a ferrite (not shown). In this case, the solenoid-type power transmission coil is provided such that the coil axis direction intersects (for example, orthogonal) with the axis X.

  Moreover, although the power transmission coil 20 demonstrated the example in which the coil winding part 22 was compressed and coat | covered with the adhesive member, it is not limited to this. In the power transmission coil 20, the coil winding portion 22 may not be compressed and not covered with the adhesive member.

  Moreover, although the ferrite 30 demonstrated the example formed in the rectangular plate shape, it is not limited to this. For example, the ferrite 30 may be formed in a circular plate shape, or a plurality of small block-shaped ferrites may be arranged to form one ferrite.

  Moreover, although the shield member 40 demonstrated the example by which the both sides of an axial direction were opened, it is not limited to this. For example, the shield member 40 may be closed on the ferrite 30 side in the axial direction.

  Moreover, although the shield member 40 demonstrated the example in which the cross-sectional shape (cutting part 41b) along an axial direction was formed in the arc shape, it is not limited to this. For example, the shield wall portion 41 may have a rectangular cross-sectional shape along the axial direction.

  Moreover, although the outer case 70 demonstrated the example which is formed in a box shape and covers the inner case 60 completely, it is not limited to this. For example, the outer case 70 may be provided so as to cover the inner case 60 from the upper side in the axial direction in a state where the inner case 60 assembled with the component parts is installed on the installation surface.

  Moreover, although the inner case 60 demonstrated the example in which the board | substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 were assembled | attached with an adhesive tape etc., it is not limited to this. For example, the inner case 60 may be assembled with components including the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 by insert molding. In this case, the inner case 60 can simplify the mold used in the insert molding as compared with the case where the component parts are directly assembled in the outer case (not shown) by insert molding. Thereby, the power transmission unit 1 can reduce manufacturing cost.

  In the inner case 60, the substrate 10 is assembled on the side opposite to the standing wall portion 62 of the support plate 61 via a plurality of spacers (not shown). Here, each spacer is a member that prevents interference between the inner case 60 and the electronic component 11 of the substrate 10. Each spacer is erected on the mounting surface 10 a of the substrate 10, and a bolt fastening hole (not shown) is provided at an end on the inner case 60 side. In the inner case 60, a plurality of bolt insertion holes (not shown) are provided in the support plate 61. In the inner case 60, each bolt insertion hole is aligned with the bolt fastening hole of each spacer. In the inner case 60, a plurality of bolts (not shown) are inserted into the respective bolt insertion holes, and the inserted bolts are fastened to the respective bolt fastening holes, whereby the substrate 10 is connected to the inner case 60. Assembled into. In the present embodiment, the inner case 60 is assembled with the support plate 61 of the inner case 60 and the substrate 10.

DESCRIPTION OF SYMBOLS 1 Power transmission unit 10 Board | substrate 20 Power transmission coil 20A The other party power transmission coil 21 Conductor wire 10a Mounting surface 30 Ferrite (magnetic member)
40 Shield member 41 Shield wall portion 41a Wall surface 50 Communication coupler (communication portion)
50A partner communication coupler (partner communication unit)
60 Inner case (inner member)
61 Support Plate 62 Standing Wall 63 Storage Chamber 63a Space 70 Outer Case (Outer Member)
P interval X axis

Claims (5)

A power transmission coil that transmits power in a contactless manner;
A substrate having a circuit and electrically connected to the power transmission coil;
A magnetic member including a magnetic material provided in the power transmission coil;
Inner in which relative positions of the substrate, the power transmission coil, and the magnetic member are defined, and the substrate, the power transmission coil, and the magnetic member are assembled so that power can be transmitted to the counterpart power transmission coil. Members,
An outer member covering the substrate, the power transmission coil, and the inner member on which the magnetic member is assembled;
A power transmission unit comprising: A shield member that shields the magnetic force of the power transmission coil;
A communication unit for transmitting and receiving signals,
The inner member is
Furthermore, the electric power transmission unit of Claim 1 which prescribes | regulates the relative position of the said shield member and the said communication part, and the said shield member and the said communication part are assembled | attached so that communication with the other party communication part is possible. The communication unit and the shield member are formed in an annular shape around an axis,
The inner member is
A support plate provided so as to intersect the axis;
A standing wall portion that is erected from the support plate and provided in an annular shape around the axis, the communication portion is wound around the outer surface and attached to the outer surface, and the shield member is attached to the inner surface side;
A storage chamber that is provided inside the standing wall and has a space, and stores the power transmission coil and the magnetic member in the space;
The power transmission unit according to claim 2, comprising: The inner member is
Holding the communication unit so that the communication unit surrounds the power transmission coil at a position along the crossing direction intersecting the axis,
The power transmission unit according to claim 3, wherein the shield member is held so that the shield member is positioned between the power transmission coil and the communication unit in the intersecting direction. The shield member is
Provided to surround the power transmission coil at a position along a crossing direction intersecting the axis, and includes a shield wall portion that shields the magnetic force generated by the power transmission coil,
The shield wall is
5. The power transmission unit according to claim 3, wherein an interval between wall surfaces facing each other in the intersecting direction is formed so as to increase from one side in the axial direction along the axis toward the other side.

Images