JP2013138071A - Coil unit and noncontact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil unit which absorbs mechanical stress from the exterior of a case and prevents a coil provided in the case from being damaged without deteriorating the power transmission efficiency, and to provide a noncontact power supply device.SOLUTION: A coil unit 1 includes: a case 2; and a coil 3 provided in the case. In the case, a connector 5 connected with an external device is provided. The coil unit includes a connection member 6 connected with a terminal of the coil at one end and a connection terminal 7 connected with the connector and the other end of the connection member. The connection member and the connection terminal respectively have electrical resistance that is equivalent to or smaller than that of the coil and also have elasticity smaller than that of the coil.

Description

    The present invention relates to a coil unit including a case and a coil provided inside the case, and a non-contact power feeding device.

  As the coil unit described above, for example, the one shown in FIG. 15 is known. The coil unit 101 includes a bottomed cylindrical case 102 mounted on an automobile, a loop-shaped power receiving side coil 103 accommodated in the case 102, and a power receiving side coil connected to the power receiving side coil 103. And a connector 105 that outputs electric power from 103 to a load.

  The case 102 includes a disc-shaped bottom plate 121 and a peripheral plate 122 erected from the periphery of the bottom plate. The case 102 is made of a conductive metal plate, and is a shield case that ensures power transmission efficiency and reduces leakage electromagnetic fields. In the case 102, the power receiving side coil 103 is accommodated so as to face the surface of the bottom plate 121, and the power receiving side coil 103 is disposed on the bottom plate 121 via a holding member.

  The connector 105 is attached to the case 102 and connects a coaxial cable (not shown) connected to a load and an extending portion 103 </ b> A extending the power receiving side coil 103. The connector 105 includes a connector terminal 151 that is inserted into a through hole (not shown) formed in the peripheral plate 122 of the case 102 and connects the core wire of the coaxial cable and the extending portion 103 </ b> A, and a power receiving side coil 103. An L-shaped GND terminal 153 connected to the extended portion 103B is provided. The GND terminal 153 is stacked inside the peripheral plate 122 and is electrically connected to the case 102.

  In the conventional coil unit 101 described above, the extending portion 103A of the power receiving side coil 103 and the connector terminal 151 are bolted, the extending portion 103B of the power receiving side coil 103 and the GND terminal 153 are bolted, and the receiving side coil 103 103 is fixed to the case 102 via the connector 105.

  However, in the conventional coil unit 101 described above, the extension 103A of the power receiving side coil 103 is fixed to the connector 105, and the connector 105 is fixed to the case 102. When mechanical stress such as impact is applied and the peripheral plate 122 and the bottom plate 121 are relatively displaced, excessive stress acts on the extending portions 103A and 103B, and the power receiving coil 103 may be damaged. There was a problem that there was. Further, even the coil unit 101 of the type that is placed on the ground has a problem that it may be damaged in the same manner as when mounted on an automobile due to an impact at the time of installation.

  Accordingly, an object of the present invention is to provide a coil unit and a non-contact power feeding device that can absorb mechanical stress from outside the case and prevent damage to the coil provided inside the case without reducing power transmission efficiency. It is to provide.

  The present invention according to claim 1 for solving the above-described problem is a coil unit including a case and a coil provided inside the case, and the case is connected to an external device. And a connection member connected at one end to the terminal of the coil, and a connection terminal connected to the connector and connected to the other end of the connection member, the connection member and the connection Each of the terminals is a coil unit characterized in that it has an electrical resistance that is approximately the same as or smaller than that of the coil and a smaller elastic modulus than that of the coil.

  According to the above configuration, the electrical resistance of the connection member and the connection terminal is approximately the same as or smaller than that of the coil, so that a current easily flows, and power transmission efficiency is not reduced. Since the connecting member and the connecting terminal have an elastic modulus smaller than that of the coil, the relative displacement and vibration generated in the case and the coil can be absorbed by the connecting member and the connecting terminal.

  According to a second aspect of the present invention, in the coil unit according to the first aspect, a connector terminal provided in the connector and the connection member are connected in a state where their end faces are in contact with each other, and the connection terminal is a strip plate It is formed in the shape, and it is fixed along the surface of the said connector terminal and the said connection member while straddling the said end surfaces.

  According to the above configuration, the connector terminal and the connection member are electrically connected to each other by contact between the end faces in a state where no external force or vibration is applied. On the other hand, when an external force or vibration is applied, even if the end faces are not in contact with each other, the electrical connection can be maintained through the connection terminal.

  According to a third aspect of the present invention, there is provided the coil unit according to the first aspect, wherein one end surface of the connector terminal and the connecting member provided on the connector and the other surface are in contact with each other. The connection members are connected to each other, the connection terminals are formed in an L shape, and are fixed along the surfaces of the connector terminals and the connection members.

  According to the above configuration, in the state where no external force or vibration is applied, one end surface of the connector terminal and the connection member and the other surface are electrically connected to each other by contact. On the other hand, when an external force or vibration is applied, even if one end surface and the other surface are not in contact with each other, electrical connection can be maintained through the connection terminal.

  According to a fourth aspect of the present invention, in the coil unit according to any one of the first to third aspects, the connecting member is a flat braid in which a plurality of conductive wires are knitted, and a flat in which a plurality of electric wires are arranged. It is characterized by comprising either a cable or a conductive foil body in which a plurality of conductive foils are stacked.

  According to the above configuration, since the connecting member is composed of any one of a flat braid in which a plurality of conductive wires are knitted, a flat cable in which a plurality of electric wires are arranged, and a conductive foil body in which a plurality of conductive foils are stacked, it is easy. A connecting member can be realized with a simple configuration.

  According to a fifth aspect of the present invention, in the coil unit according to any one of the first to third aspects, the connection member includes a tubular body or a rod-shaped body having a flexible portion at an intermediate portion, and a plurality of links. It is characterized in that it is configured by any one of link bodies which are connected to each other so as to be rotatable.

  According to the above configuration, since the connecting member is configured by any one of a tubular body or a rod-shaped body having a flexible portion at the intermediate portion, and a link body in which a plurality of links are rotatably connected to each other, a simple configuration A connecting member can be realized.

  A sixth aspect of the present invention is a non-contact power feeding device including the coil unit according to any one of the first to fifth aspects.

  According to the above configuration, the electrical resistance of the connection member and the connection terminal is approximately the same as or smaller than that of the coil, so that a current easily flows, and power transmission efficiency is not reduced. Since the connecting member and the connecting terminal have an elastic modulus smaller than that of the coil, the relative displacement and vibration generated in the case and the coil can be absorbed by the connecting member and the connecting terminal.

  According to the present invention, since the electrical resistance of the connection member and the connection terminal is approximately the same as or smaller than that of the coil, the current easily flows, and the connection member and the connection terminal can be connected without reducing the power transmission efficiency. Because it has a smaller elastic modulus than the coil, the relative displacement and vibration generated between the case and the coil can be absorbed by the connection member and connection terminal, so it absorbs mechanical stress from outside the case and is provided inside the case. It is possible to prevent the damaged coil from being damaged.

It is a perspective view showing one embodiment of a coil unit concerning the present invention. It is a conceptual diagram which shows the non-contact electric power feeder which employ | adopted the coil unit shown in FIG. It is sectional drawing which follows the II line | wire in FIG. It is a top view of the coil unit shown in FIG. It is a perspective view which shows the state by which the connection member and connector terminal which comprise the connector unit shown in FIG. 1 were connected via the connection terminal. (A) is a top view which shows the natural state which the connection terminal shown by FIG. 5 has not deform | transformed, (B) is a top view which shows the state which the connection terminal deform | transformed. It is a perspective view which shows the state by which the connection member and GND terminal which comprise the connector unit shown in FIG. 1 were connected via the connection terminal. (A) is a top view which shows the natural state which the connection terminal shown by FIG. 7 is not deform | transforming, (B) is a top view which shows the state which the connection terminal deform | transformed. It is a perspective view which shows the modification of the connection member which comprises the coil unit shown by FIG. It is a perspective view which shows the other modification of the connection member shown by FIG. It is a perspective view which shows the other modification of the connection member shown by FIG. FIG. 12 is a perspective view showing still another modification of the connection member shown in FIG. 11. (A) (B) is a perspective view which shows the other modification of the connection member shown by FIG. (A) is a perspective view which shows the other modification of the connection member shown by FIG. 13, (B) is sectional drawing of (A). It is a perspective view which shows the conventional coil unit.

  Hereinafter, the coil unit 1 which comprises the non-contact electric power feeder 10 of this invention is demonstrated based on FIGS. As shown in FIGS. 1 and 2, the coil unit 1 includes a bottomed cylindrical case 2 mounted on the abdomen of the automobile 11A, a loop-shaped power receiving side coil 3 housed in the case 2, The power receiving side coil 3 is disposed so as to be opposed to the power receiving side coil 3 in the direction of the central axis (arrow Z direction), and is electromagnetically coupled to the power receiving side coil 3 and a load as an external device. A connector 5 connected to the case 2 and connected to the terminal of the receiving coil, a long connection member 6 connected to the terminal of the receiving coil, and a connection terminal 7 for connecting the connection member 6 and the connector 5 Yes.

  The non-contact power supply device 10 is a device for supplying electric power to the load of the automobile 11A in a non-contact manner from the power supply unit 12 provided on the road 11B. More specifically, the power feeding unit 12 includes a power feeding side coil 13 that electromagnetically resonates with the power receiving side coil 3 so as to face the power receiving side coil 3 so as to face the central axis direction (arrow Z direction), and the power feeding side coil. 13, and a power supply side resonance coil 14 that is disposed so as to face the central axis direction (arrow Z direction) with respect to 13 and electromagnetically coupled to the power supply side coil 13. When an alternating current is supplied to the power supply side coil 13, the electric power is sent to the power supply side resonance coil 14 by electromagnetic induction. That is, power is supplied to the power supply side resonance coil 14 via the power supply side coil 13. When power is sent to the power supply side resonance coil 14, the power is wirelessly sent to the power reception side resonance coil 4 by magnetic field resonance. Further, when power is sent to the power receiving side resonance coil 4, the power is sent to the power receiving side coil 3 by electromagnetic induction and supplied to a load connected to the power receiving side coil 3.

  As shown in FIG. 1, the case 2 includes a disk-shaped bottom plate 21 and a peripheral plate 22 erected from the periphery of the bottom plate 21. This case 2 is a shield case made of a conductive metal plate having a minimum thickness capable of ensuring electromagnetic shielding performance from the viewpoint of weight reduction, and ensuring power transmission efficiency and reducing leakage electromagnetic fields. . A bobbin 23 made of an insulating synthetic resin is provided in the case 2, and the power receiving side coil 3 is accommodated so as to face the surface of the bottom plate 21 through the bobbin 23. The peripheral plate 22 is formed with an insertion hole 2a (shown in FIG. 3 and the like) through which the connector 5 is inserted.

  The power receiving side coil 3 is formed by winding a strip-shaped conductive member that can secure a low resistance (for example, 100 mΩ or less) in a circular loop shape in the case of non-contact power transmission of charging power (for example, 3 kw) to a battery mounted on an automobile. The center axis direction (arrow Z direction) is arranged along the direction from the belly portion of the automobile 11A toward the road 11B, that is, along the vertical direction (arrow Z direction). Further, the surface of the power receiving side coil 3 faces the surface of the bottom plate 21. In the present embodiment, the power receiving side coil 3 is configured to be wound in a circular loop shape, but the present invention is not limited to this, and the power receiving side coil 3 has a conductive member in a helical shape, or It may be configured to be wound in a spiral shape. The power receiving side coil 3 corresponds to a “coil” recited in the claims.

  As shown in FIG. 3, the connector 5 includes a plate-like connector terminal 51 connected to the core wire 91 of the coaxial cable 9 and a horizontal direction orthogonal to the longitudinal direction of the connector terminal 51, that is, the vertical direction Z ( A cylindrical insulating portion 52 that covers an intermediate portion in the direction of arrow Y) and a plate-like GND terminal 53 provided at an end portion in the longitudinal direction (arrow Y direction) of the insulating portion 52 are provided. The connector terminal 51, the insulating part 52, and the GND terminal 53 are composed of different members. The connector terminal 51 is formed with an insertion hole 5a through which the bolt 8 is inserted inside at the tip. The GND terminal 53 has a through hole 5b formed at the center, and is provided so that the connector terminal 51 is inserted into the through hole 5b and faces the inner surface of the peripheral plate 22. As shown in FIG. 4, a second connection terminal 72 (described later) of the connection terminal 7 is provided between the peripheral plate 22 and the GND terminal 53, and the case 2 and the GND terminal 53 are connected to the second connection terminal 72. It is electrically connected via. Each of the connector terminal 51 and the GND terminal 52 corresponds to a “connector terminal” recited in the claims. In the present embodiment, the connector 5 includes a connector terminal 51 and a GND terminal 53 connected to the coaxial cable 9, but the present invention is not limited to this, and a pair of terminal portions (not shown) ), And two electric wires connected to each of the pair of terminal portions are provided, and one of the pair of terminal portions connects one of the power receiving side coil 3 and the electric wire, and the other is a power receiving side coil. You may connect the other end of 3 and the other end of an electric wire.

  As shown in FIG. 5, the connecting members 6 and 6 </ b> A are composed of a flat braid formed of a conductive wire made of metal and formed into a strip shape, and have a smaller elastic modulus than the power receiving side coil 3 described above. And having an electric resistance smaller than that of the power receiving side coil 3. Two connection members 6A are provided, one connected to one terminal of the power receiving side coil 3 and the connector terminal 51, and the other connected to the other terminal of the power receiving side coil 3 and the GND terminal 53. Further, the connection member 6A is formed with insertion holes (not shown) through which the bolts 8 are inserted at both ends in the longitudinal direction of the connection member 6A. The connecting member 6A, that is, the flat braid is composed of at least one of aluminum, iron, copper, silver, and other alloys.

  The connection terminal 7 is composed of a conductive metal plate having an elastic modulus smaller than that of the power receiving side coil 3 described above and having an electric resistance smaller than that of the power receiving side coil 3. Further, the connection terminal 7 is formed with insertion holes (not shown) through which the bolts 8 are inserted at both ends in the longitudinal direction of the connection terminal 7. Two connection terminals 7 are provided, and one (hereinafter referred to as a first connection terminal and denoted by reference numeral 71) is formed in a band plate shape as shown in FIG. 5, and includes a connector terminal 51 and a connection member. One end of the first connection terminal 71 is bolted to the connector terminal 51 and the other end is bolted to the connection member 6A in a state where the end faces of 6A are in contact with each other and straddle the end faces. On the other side (hereinafter referred to as second connection terminal 72 and denoted by reference numeral 72), as shown in FIG. 7, a strip-shaped metal plate is formed in an L shape, and the surface of the GND terminal 53 and the connection member In this state, one end of the second connection terminal 72 is fixed to the connection member 6A by bolts, and the other end is fixed to the GND terminal 53 using screws 81. Alternatively, the end surface of the GND terminal 53 and the surface of the connection member 6A may be fixed in contact with each other.

  Such a connection terminal 7 has such a hardness (rigidity) that it does not bend due to the weight of the connection member 6 </ b> A or the bolt 8 in a natural state where no vibration or impact is applied. Further, the connection terminal 7 has a rigidity smaller than that of the case 2. For this reason, when an impact is applied to the extent that the case 2 is destroyed, the connection terminal 7 may be destroyed. By destroying the connection terminal 7, it is possible to prevent an impact from being transmitted to the power receiving side coil 3 and the connector 5, and to prevent the power receiving side coil 3 and the connector 5 from being destroyed.

  The connection terminal 7 has an elastic modulus (spring property) that absorbs vibration by bending when the connection terminal 7 is subjected to vibration or impact, and returns to a natural state when the vibration stops. Yes. The degree of springiness of the connection terminal 7 is, for example, based on the conditions of a vibration resistance test of an electronic component mounted on a vehicle as a guideline, and in a natural state before the vibration is applied when the vibration stops. It is specified to have springiness that can be returned.

  Then, the assembly method of the coil unit 1 mentioned above is demonstrated. First, the core wire 91 of the coaxial cable 9 is connected to the connector terminal 51 in advance. The case 2 is arranged such that the bottom plate 21 is along the horizontal direction (arrow Y direction), and the power receiving side coil 3 is arranged on the bottom plate 21 via the bobbin 23. The GND terminal 53 is brought close to the inner surface of the peripheral plate 22, the connector terminal 51 is inserted into the insertion holes 2 a and 5 b, and one end portion of the second connection terminal 72 is sandwiched between the GND terminal 53 and the peripheral plate 22. In this state, the peripheral plate 22, the second connection terminal 72, and the GND terminal 53 are fixed using screws 81. Thus, the case 2 and the GND terminal 53 are electrically connected via the second connection terminal 72. The surface of the GND terminal 53 and the end surface of the connection member 6A are brought into contact with each other, and the second connection terminal 72 and the connection member 6A are bolted in this state. At this time, one end of the connecting member 6A is opposed to the surface of the bottom plate 21, that is, provided along the horizontal direction (arrow Y direction), and the other end is along the direction orthogonal to the surface of the bottom plate 21. The middle part is twisted.

  Next, the end surfaces of the connector terminal 51 and the connection member 6A are brought into contact with each other, the first connection terminal 71 is overlapped on the bottom plate 21 side of the connector terminal 51 and the connection member 6A, and the connector terminal 51 and the first connection terminal 71 are connected. The member 6A and the first connection terminal 71 are each bolted. Finally, the power receiving side resonance coil 4 is arranged so as to be opposed to the power receiving side coil 3 in the central axis direction (arrow Z direction). Thus, the coil unit 1 is assembled.

  Next, functions and effects of the present invention will be described. As shown in FIG. 6A, the first connection terminal 71 is in a natural state in which it does not deform when no external force or vibration is applied. That is, the first connection terminal 71 can maintain a natural state in which the first connection terminal 71 is not deformed by the weight of the connector terminal 51 and the connection member 6A. In this state, the connector terminal 51 and the connection member 6A are electrically connected by contact between the end faces.

  When an external force or vibration is applied to the first connection terminal 71, as shown in FIG. 6B, the first connection terminal 71 is deformed so that its intermediate portion is bent, and the connector terminal 51 and the connection member 6A are mutually connected. Even if the end faces are separated from each other and are not in contact with each other, electrical connection can be maintained through the first connection terminal 71. As for the second connection terminal 72, as shown in FIGS. 8A and 8B, the same operation and effect as the first connection terminal 71 can be obtained.

  According to the above-described embodiment, the electric resistance of the connection member 6 and the connection terminal 7 is approximately the same as that of the power reception side coil 3 or smaller than that of the power reception side coil 3. The connection member 6 and the connection terminal 7 have a smaller elastic modulus than that of the power receiving side coil 3 and the relative displacement and vibration generated in the case 2 and the coil are reduced without reducing the power transmission efficiency. Further, since it can be absorbed by the connection terminal 7, mechanical stress from the outside of the case 2 can be absorbed, and damage to the power receiving side coil 3 provided inside the case 2 can be prevented. And since the coil unit 1 and the non-contact electric power feeder 10 which are hard to break can be provided, the maintenance frequency after installation in 11 A of motor vehicles can be reduced, and a user's burden can be lightened. Moreover, since the connection member 6 has a smaller elastic modulus than that of the power receiving side coil 3, that is, the connection member 6 has flexibility, the assembly work of the coil unit 1 can be facilitated.

  In the above-described embodiment, the connection member 6A has insertion holes through which the bolts 8 are inserted at both ends in the longitudinal direction of the connection member 6A. However, the present invention is not limited to this. Instead, as shown in FIG. 9, the connecting member 6 </ b> A may be provided with a mounting portion 61 instead of the insertion hole. The attachment portion 61 has a rectangular bottom plate 62 on which the end of the connection member 6A is placed, a extending plate 63 smaller than the longitudinal direction of the bottom plate 62 extending from the bottom plate 62, and a bottom plate 62. A pair of caulking pieces 64 erected from both ends in the longitudinal direction, and the extending portion 63 is formed with an insertion hole 6b through which the bolt 8 is inserted, and the pair of caulking pieces 64 are connected members. The attachment portion 61 may be attached to the connecting member 6A by caulking 6A. 9 to 14, the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  Further, as the connection members 6 and 6B, as shown in FIG. 10, a conductive foil body in which a plurality of foil-shaped conductive foils made of a conductive metal such as copper, a copper alloy, or aluminum may be used. In that case, attachment portions 61 may be provided at both ends in the longitudinal direction. Further, as shown in FIG. 11, flat cables in which a plurality of electric wires 65 are arranged may be used as the connection members 6 and 6C. In this case, the pressure contact type connectors 66 are respectively provided at both ends in the longitudinal direction. May be provided. In the electric wire 65, one core wire may be constituted by one conductive wire, that is, a single wire, and one core wire may be constituted by a stranded wire.

  As shown in FIG. 12, as the connection members 6 and 6D, a tubular body having a cylindrical main body portion 67 and a bellows-like flexible portion 68 provided at an intermediate portion of the main body portion 67. A body may be used, and in that case, attachment portions 61 may be provided at both ends in the longitudinal direction. Alternatively, as the connecting member 6D, a rod-shaped body having a main body portion (not shown) formed in a rod shape and a coil spring provided at an intermediate portion of the main body portion may be used.

  Further, as shown in FIG. 13A, the connection members 6 and 6E are provided as one band provided between two first members 69A formed in a band plate shape and two first members 69A. A link body including a plate-like second member 69B may be used. Each first member 69A has a band plate-shaped main body 70 and an attachment piece 71 provided at one end in the longitudinal direction of the main body 70, and the other end of the main body 70 is a second member 69B. In this state, the pins 82 may be inserted into the main body 70 and the second member 69B, and the first members 69A may be movably connected to the second member 69B in the horizontal direction. Two or more second members 69B may be provided. Further, as shown in FIG. 13B, the second member 69B is arranged so that one surface of the two first members 69A and the other surface intersect (orthogonal) each other. It may be twisted.

  14A and 14B, the connecting members 6 and 6F are, for example, three cylindrical members 72, a link 73 provided at one end in the longitudinal direction of the cylindrical member 72, and the other end. The link body 74 may be a link body in which the link 73 and the link receiver 74 adjacent to each other are rotatably connected to each other. The connection member 6F may be provided with attachment portions 61 at both ends in the longitudinal direction.

  Moreover, the connection member 6 described above may be covered with an insulating material in order to ensure discharge resistance and environmental resistance.

  In addition, one power receiving side coil 3 and one power receiving side resonance coil 4 are provided in the case 2, but the present invention is not limited to this, and two or more power receiving sides are provided in the case 2. The coil 3 and two or more power receiving resonance coils 4 may be provided.

  In the embodiment described above, the coil unit 1 is mounted on the abdomen of the automobile 11A. However, the present invention is not limited to this, and the coil unit 1 is used for the power feeding unit 12 provided on the road 11B. May be.

  In the above-described embodiment, the resonance type non-contact power feeding device 10 is used. However, the present invention is not limited to this, and the non-contact power feeding method may be an electromagnetic induction type. The coil unit 1 is not limited to non-contact power feeding, and may be applied to various devices as a single unit.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Coil unit 2 Case 3 Power receiving coil (coil)
5 Connector 51 Connector terminal 53 GND terminal (Connector terminal)
6, 6A-6F Connection member 7 Connection terminal

Claims (6)

A coil unit including a case and a coil provided inside the case, wherein the case is provided with a connector connected to an external device;
A connection member connected at one end to the terminal of the coil, and a connection terminal connected to the connector and connected to the other end of the connection member;
The coil unit, wherein the connection member and the connection terminal each have an electrical resistance that is comparable to or smaller than that of the coil, and each has a smaller elastic modulus than the coil. The connector terminal provided in the connector and the connection member are connected in a state in which their end faces are in contact with each other,
2. The coil unit according to claim 1, wherein the connection terminal is formed in a band plate shape, extends across the end faces, and is fixed along the surfaces of the connector terminal and the connection member. The connector terminal and the connection member are connected to each other in a state in which one end surface of the connector terminal and the connection member provided in the connector and the other surface are in contact with each other,
The coil unit according to claim 1, wherein the connection terminal is formed in an L shape and is fixed along surfaces of the connector terminal and the connection member.   The connection member is configured by any one of a flat braid in which a plurality of conductive wires are knitted, a flat cable in which a plurality of electric wires are arranged, and a conductive foil body in which a plurality of conductive foils are stacked. The coil unit according to any one of claims 3 to 4.   The said connection member is comprised by either the tubular body or rod-shaped body which has a flexible part in the intermediate part, and the link body which connected the some link so that rotation was mutually possible. The coil unit according to any one of items 3 to 4.   A non-contact power feeding apparatus comprising the coil unit according to any one of claims 1 to 5.

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