JP6935309B2 - Power transmission unit - Google Patents

Description

The present invention relates to a power transmission unit.

Conventionally, as a power transmission unit, for example, Patent Document 1 includes a power feeding side resonance coil that supplies power and a power feeding side shield case that shields the leakage magnetic field of the power feeding side resonance coil, and receives power in a non-contact manner. A power supply unit that supplies power to the power supply unit is disclosed.

Japanese Unexamined Patent Publication No. 2014-113021

By the way, it is conceivable that the feeding portion described in Patent Document 1 described above is molded by covering the feeding side resonance coil and the feeding side shield case with an insulating material, for example, to enhance durability. In this case, it is considered that the power feeding portion described in Patent Document 1 loses the fluidity of the insulating material or bubbles remain during molding, and there is room for further improvement in this respect.

Therefore, it is an object of the present invention to provide a power transmission unit which has been made in view of the above and can be appropriately molded by an insulating material.

In order to solve the above-mentioned problems and achieve the object, the power transmission unit according to the present invention is formed in a tubular shape around the axis with a power transmission coil capable of transmitting power in a non-contact manner with the power transmission coil on the other side. A shield member having an internal space inside the power transmission coil and an opening on one side in the axial direction along the axis to shield the leakage magnetic field generated by the power transmission coil. A housing having a housing portion for accommodating the power transmission coil and the shield member, and a closing wall portion which is a wall portion for closing the opening of the shield member housed in the housing portion, and at least the internal space. A mold member that fills the accommodating portion including the portion is provided, and at least one of the housing or the shield member is a space outside the shield member at a boundary portion between the closed wall portion and the opening. A first communication port that communicates between the external space portion and the internal space portion, and a second communication port that is provided at a position different from the first communication port and communicates between the internal space portion and the external space portion. It is characterized by having a mouth.

In the power transmission unit, the first communication port is provided on one side in an orthogonal direction orthogonal to the axis direction with reference to the axis, and the second communication port is provided in the orthogonal direction with reference to the axis. It is preferable that it is provided on the other side of the.

In the power transmission unit, the first communication port has a first groove portion in which the closed wall portion is formed in a concave shape and a first notch in which an end portion of the opening portion of the shield member is formed in a notch shape. The second communication port is formed by facing the portions, and the second communication port is provided at a position different from that of the first groove portion, and the closed wall portion is formed in a concave shape, and the first notch portion and the second groove portion. Is preferably formed by facing the second notch, which is provided at a different position and the end of the opening of the shield member is formed in a notch shape.

In the power transmission unit, it is preferable that the closed wall portion is formed in a concave shape and has a connecting groove portion that connects the first groove portion and the second groove portion.

In the power transmission unit, it is preferable that the closed wall portion is provided with a reinforcing rib at least at the bottom of the connecting groove portion.

In the power transmission unit, it is preferable that the internal space portion is formed with a distribution path through which the insulating material forming the mold member can flow between the first communication port and the second communication port.

Since the power transmission unit according to the present invention has first and second communication ports for communicating the external space portion of the shield member and the internal space portion of the shield member, the insulating material and the fluidity of air bubbles are ensured during molding. And can be properly molded with an insulating material.

FIG. 1 is a perspective view showing a configuration example of a power transmission unit according to an embodiment. FIG. 2 is an exploded perspective view showing a configuration example of the power transmission unit according to the embodiment. FIG. 3 is a perspective view showing a configuration example of a main part of the power transmission unit according to the embodiment. FIG. 4 is a perspective view showing an example of assembling the upper plate inner wall portion and the shield member according to the embodiment. FIG. 5 is a perspective view showing an example of assembling the upper plate inner wall portion and the shield member according to the embodiment. FIG. 6 is an exploded perspective view showing a configuration example of a main part of the power transmission unit according to the embodiment. FIG. 7 is a perspective view showing a configuration example of the upper plate inner wall portion according to the embodiment. FIG. 8 is a perspective view showing a configuration example of the power transmission unit according to the embodiment.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions or changes of the configuration can be made without departing from the gist 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 in a non-contact manner. 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 on the bottom surface of the vehicle, for example, and is connected to the storage battery of the vehicle. Further, the power transmission unit 1 on the power transmission side is installed on the ground of a charging station (not shown) and is 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. The power transmission unit 1 is not limited to the above-mentioned usage example, and may be used for other purposes. In the following description, the power transmission unit 1 has the same main configurations on the power transmission side and the power reception side, and therefore, unless otherwise specified, the power transmission side and the power reception side will be described without distinction.

As shown in FIGS. 1, 2, 3, 6, and 8, the power transmission unit 1 includes a substrate 10, a power transmission coil 20, a ferrite member 30, a shield member 40, and a mold member 50. An outer case 60 as a housing and a resin communication port 70 are provided. Note that FIG. 1 shows a state in which the mold member 50 is not filled in the outer case 60, and FIG. 8 shows a state in which the mold member 50 is filled in the outer case 60.

Here, the axial direction is the direction along the axis X (see FIGS. 3 and 6) of the shield member 40. The axial direction is also the direction along the axis of the power transmission coil 20. The orthogonal direction is a direction orthogonal to the axial direction. The depth direction is the direction in which the resin passage groove 67 (see FIG. 3 and the like), which will be described later, extends. The width direction is a direction along the width of the resin passage groove 67. The axial direction, the depth direction, and the width direction are orthogonal to each other.

The substrate 10 is a so-called printed circuit board (Printed Circuit Board) on which various electronic components (not shown) are mounted and constitutes an electronic circuit for electrically connecting each electronic component. In the substrate 10, a wiring pattern (print pattern) is formed (printed) on an insulating layer made of an insulating material by a conductive member such as a copper foil. The substrate 10 is, for example, a multilayer substrate (that is, a multilayer substrate) in which a plurality of insulating layers on which a wiring pattern is formed are laminated to form a multilayer. The power transmission coil 20 is electrically connected to the substrate 10. The substrate 10 is assembled to the accommodating portion 62 (see FIG. 1 and the like) of the outer case 60. The substrate 10 is arranged orthogonally to the axial direction, for example, and is supported by a pair of substrate guide rails 63 (see FIG. 2) of the outer case 60.

The power transmission coil 20 is a coil capable of transmitting power in a non-contact manner with a power transmission coil (not shown) on the other side. The power transmission coil 20 is formed in a spiral shape by winding a conductive wire a plurality of times around the axis X. In addition, in FIGS. 3 and 6, the power transmission coil 20 is shown in a simplified manner and simply in a rectangular shape. The power transmission coil 20 is assembled to the accommodating portion 62 of the outer case 60. The power transmission coil 20 is assembled to the upper plate portion 61a of the outer case 60, which will be described later, in a state of facing the substrate 10 along the axial direction, for example. In the power transmission unit 1, since the power transmission coil 20 is assembled to the upper plate portion 61a facing the power transmission coil on the other side, the distance between the power transmission coil 20 and the power transmission coil on the other side is relatively narrowed. It is possible to suppress a decrease in power transmission efficiency. In the power transmission coil 20, the winding start end 21 (see FIG. 3 and the like) and the winding end 22 of the conductive wire are electrically connected to the substrate 10. The power transmission coil 20 is arranged to face the power transmission coil on the other side, and transmits power to the power transmission coil on the other side in a non-contact manner.

The ferrite member 30 is a member containing a magnetic material, and is, for example, a composite oxide of iron oxide and a metal. The ferrite member 30 is formed, for example, in the shape of a rectangular plate and has the same size as the power transmission coil 20. The ferrite member 30 is assembled to the upper plate portion 61a of the outer case 60 in a state of facing the substrate 10 side of the power transmission coil 20 in the axial direction. The ferrite member 30 is held by, for example, a ferrite holding protrusion 66 (see FIG. 3 or the like) protruding from the upper plate portion 61a of the outer case 60. The ferrite member 30 passes the magnetic flux generated by the power transmission coil 20 to suppress the loss of the magnetic flux.

The shield member 40 is a member that shields the 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 has a first opening 41 (see FIG. 6) as an opening opened on one side in the axial direction, a second opening 42 having an opening on the other side in the axial direction, and a cylindrical shape around the axis X. It has a shield wall portion 43 formed in. The shield wall portion 43 is formed, for example, by press working to apply pressure to a metal plate with a mold. The shield wall portion 43 may be formed by, for example, a long plate member wound around the axis X once, or may be formed by another method. The shield wall portion 43 is formed in a substantially rectangular shape when viewed from the axial direction, and the four corner portions have roundness. The shield wall portion 43 is provided with a power transmission coil 20 and a ferrite member 30 inside. That is, the shield wall portion 43 surrounds the power transmission coil 20 and the ferrite member 30 from the outside. The shield wall portion 43 is formed in a divergent shape toward the power transmission coil side on the other side. That is, the shield wall portion 43 is formed so that the distance between the wall surfaces facing in the orthogonal direction orthogonal to the axial direction becomes wider from one side in the axial direction to the other side. As a result, the shield wall portion 43 can prevent the magnetic flux lines (magnetic flux lines) of the power transmission coil 20 from being orthogonal to each other. Therefore, since the shield wall portion 43 can suppress the flow of an eddy current that generates a magnetic field that cancels the fluctuation of the magnetic field by the power transmission coil 20, it is possible to suppress a decrease in the power transmission efficiency.

The shield wall portion 43 includes an internal space portion P (see FIGS. 4, 5, etc.) which is an inner space portion of the shield wall portion 43, and an external space portion Q (external space portion Q) which is an outer space portion of the shield wall portion 43. (See Fig. 1) and is partitioned. The internal space portion P is, for example, an inner space portion defined by the first opening 41, the second opening 42, and the shield wall 43. More specifically, the internal space portion P is provided along a first virtual plane (not shown) provided along an orthogonal direction orthogonal to the axial direction and closing the first opening 41, and is provided along the orthogonal direction. It is a space portion surrounded by a second virtual plane (not shown) that closes the second opening 42 and a shield wall portion 43. A power transmission coil 20 and a ferrite member 30 are provided in the internal space portion P. The external space portion Q is a space portion in the accommodating portion 62 of the outer case 60 excluding the internal space portion P of the shield member 40, and is a space portion outside the shield wall portion 43. More specifically, in the housing portion 62 of the outer case 60, the external space portion Q includes a first virtual plane that closes the first opening 41, a second virtual plane that closes the second opening 42, and a shield wall. It is a space part excluding the space part surrounded by the part 43.

The shield wall portion 43 has a first notch portion 43a and a second notch portion 43b (see FIG. 6). The first notch portion 43a is a portion in which the end portion of the first opening 41 is formed in a notch shape. The length of the first notch 43a in the width direction is, for example, the same as the length in the width direction of the resin passage groove 67 (see FIG. 6 and the like) described later. The height of the first notch portion 43a in the axial direction is a desired height. The first notch portion 43a is formed in a size that suppresses deterioration of the shielding performance of the shield member 40 as much as possible. The first notch portion 43a is arranged so as to face the resin passage groove 67 along the axial direction to form a first communication port 71 (see FIG. 4 and the like) described later. The second notch portion 43b is provided at a position different from that of the first notch portion 43a, and the end portion of the first opening 41 of the shield member 40 is formed in a notch shape. The second notch portion 43b is formed in the same shape as the first notch portion 43a. That is, the length of the second notch portion 43b in the width direction is the same as the length of the resin passage groove 67 in the width direction. The height of the second notch portion 43b in the axial direction is a desired height. The second notch portion 43b is formed in a size that suppresses deterioration of the shield performance of the shield member 40 as much as possible. The second notch portion 43b is arranged so as to face the resin passage groove 67 along the axial direction to form a second communication port 72 (see FIG. 4 and the like) described later. The second notch portion 43b is provided so as to face the first notch portion 43a along the depth direction.

The mold member 50 is a member that is filled in the accommodating portion 62 of the outer case 60 (see FIG. 8). The mold member 50 is formed of an insulating material such as a thermoplastic resin having plasticity that softens by heating and solidifies when cooled, or a thermosetting resin that cures by overheating or the like. The mold member 50 is filled with molten resin as an insulating material by being injected into the housing portion 62 of the outer case 60 in a state where each component such as a power transmission coil 20 is assembled and housed in the outer case 60. It is formed by. That is, in the mold member 50, the molten resin is injected and filled into the accommodating portion 62 of the outer case 60 in a state where the substrate 10, the power transmission coil 20, the ferrite member 30, and the shield member 40 are assembled to the outer case 60. It is formed by In the mold member 50, for example, the molten resin is injected from the case opening 61f with the outer case 60 standing on the work table, and the molten resin is filled up to the vicinity of the case opening 61f. That is, the molten resin is filled in the internal space portion P of the shield member 40 and the external space portion Q of the shield member 40 in the accommodating portion 62 of the outer case 60. In the mold member 50, the molten resin filled in the accommodating portion 62 of the outer case 60 is cooled and solidified to cover the substrate 10, the power transmission coil 20, the ferrite member 30, and the shield member 40. As a result, the mold member 50 can seal the substrate 10, the power transmission coil 20, the ferrite member 30, and the shield member 40, and further, the positions of each of these components can be firmly fixed. ..

The outer case 60 is a housing that accommodates each component in a state in which each component such as the power transmission coil 20 is assembled. The outer case 60 is formed of, for example, an insulating resin. The outer case 60 is formed in a rectangular parallelepiped shape, for example, and has an outer wall portion 61 including an upper plate portion 61a, a lower plate portion 61b, a left plate portion 61c, a right plate portion 61d, and a rear plate portion 61e. In the outer case 60, the upper plate portion 61a, the lower plate portion 61b, the left plate portion 61c, the right plate portion 61d, and the rear plate portion 61e are each formed into a flat plate shape. In the outer wall portion 61, the upper plate portion 61a and the lower plate portion 61b face each other in the axial direction, the left plate portion 61c and the right plate portion 61d face each other in the width direction, and the case opening portion 61f and the rear plate portion 61f face each other. The portion 61e faces the portion 61e along the depth direction. The outer case 60 has a case opening 61f in which a portion facing the rear plate portion 61e in the depth direction is opened. The outer case 60 is filled with molten resin by injecting molten resin from the case opening 61f in a state where the outer case 60 is erected on a work table with the rear plate portion 61e facing down. The outer wall portion 61 is provided with a removable upper plate portion 61a. The outer wall portion 61 is provided, for example, with the upper plate portion 61a slidable along the depth direction. The outer case 60 has a housing portion 62 formed by being surrounded by the outer wall portion 61. The accommodating portion 62 accommodates each component including the substrate 10, the power transmission coil 20, the ferrite member 30, and the shield member 40. The accommodating portion 62 defines the relative positions of the components including the substrate 10, the power transmission coil 20, the ferrite member 30, and the shield member 40 so that the power can be transmitted to the power transmission coil on the other side. To hold. The outer case 60 has a pair of substrate guide rails 63, a pair of upper plate guide rails 64, a shield support portion 65, a ferrite holding projection 66, and a resin passage groove 67 in the accommodating portion 62.

The pair of board guide rails 63 are members that support the board 10. In the pair of substrate guide rails 63, one substrate guide rail 63a is provided on the left plate portion 61c, and the other substrate guide rail (not shown) is provided on the right plate portion 61d. The substrate guide rail 63a on one side and the substrate guide rail on the other side are provided so as to face each other in the width direction. The pair of substrate guide rails 63 are located closer to the lower plate portion 61b than the power transmission coil 20 in the axial direction. The pair of substrate guide rails 63 extend along the depth direction and slidably sandwich the end portion of the substrate 10 in the width direction. The pair of substrate guide rails 63 accommodate the substrate 10 in the accommodating portion 62 in a state where the position of the substrate 10 is defined by sandwiching the substrate 10.

The pair of upper plate guide rails 64 are members that slidably sandwich the upper plate portion 61a. In the pair of upper plate guide rails 64, the upper plate guide rail 64a on one side is provided at the axial end of the left plate portion 61c, and the upper plate guide rail 64b on the other side is the axial end of the right plate portion 61d. It is provided in the part. The upper plate guide rail 64a on one side and the upper plate guide rail 64b on the other side are provided so as to face each other in the width direction. The pair of upper plate guide rails 64 extend along the depth direction and slidably sandwich the end portion 61h in the width direction of the upper plate portion 61a. The pair of upper plate guide rails 64 attach the upper plate portion 61a to the left plate portion 61c and the right plate portion 61d by sandwiching the upper plate portion 61a. A power transmission coil 20, a ferrite member 30, and a shield member 40 are assembled to the upper plate portion 61a. Since the upper plate portion 61a is removable from the main body of the outer case 60, the assembling property of each component such as the power transmission coil 20 can be improved.

The shield support portion 65 is a portion that supports the shield member 40. The shield support portion 65 has a shield holding groove 65a (see FIGS. 6 and 7) and a pair of lower support plates 65b (see FIG. 2). The shield holding groove 65a is provided in the upper plate inner wall portion (closed wall portion) 61 g, which is the wall portion of the upper plate portion 61a on the power transmission coil 20 side. The upper plate inner wall portion 61g has a reference surface T, and has a portion recessed from the reference surface T and a portion protruding from the reference surface T. In the shield holding groove 65a, a recess recessed from the reference surface T in the upper plate inner wall portion 61g is formed along the shape of the first opening 41 of the shield member 40. That is, in the shield holding groove 65a, the recess in the upper plate inner wall portion 61g is annular around the axis X along the shape of the first opening 41 of the shield member 40 (the four corners are substantially rectangular with rounded corners). It is formed. In the shield holding groove 65a, the end portion of the shield member 40 on the first opening 41 side is brought into contact with the inside of the shield holding groove 65a. As a result, the shield holding groove 65a defines the positions of the shield member 40 in the depth direction and the width direction. At this time, the first opening 41 of the shield member 40 is closed by the upper plate inner wall portion 61g. Since the shield member 40 surrounds the outside of the power transmission coil 20 in a state where the first opening 41 is closed by the upper plate inner wall portion 61g, the leakage magnetic field of the power transmission coil 20 provided in the upper plate inner wall portion 61g is appropriate. Can be shielded. The pair of lower support plates 65b are members that support the second opening 42 side of the shield member 40. In the pair of lower support plates 65b, one lower support plate 65c is provided on the left plate portion 61c, and the other lower support plate 65d is provided on the right plate portion 61d. The lower support plate 65c on one side and the lower support plate 65d on the other side are provided so as to face each other in the width direction. The pair of lower support plates 65b are located closer to the upper plate portion 61a than the substrate 10 in the axial direction. The pair of lower support plates 65b extend along the depth direction and support the second opening 42 side of the shield member 40. The pair of lower support plates 65b support the shield member 40 to define the axial position of the shield member 40. In this way, the shield support portion 65 accommodates the shield member 40 in the accommodating portion 62 in a state where the position of the shield member 40 is defined by the shield holding groove 65a and the pair of lower support plates 65b.

The ferrite holding protrusion 66 is a protrusion that defines the position of the ferrite member 30 (see FIG. 3 and the like). The ferrite holding protrusion 66 is provided on the inner wall portion 61g of the upper plate. The ferrite holding protrusion 66 projects toward the ferrite member 30 along the axial direction from the reference surface T of the upper plate inner wall portion 61 g. For example, four ferrite holding protrusions 66 are provided and arranged so as to abut each of the corner portions of the ferrite member 30. The ferrite holding protrusion 66 abuts on the corner portion of the ferrite member 30 to define the position of the ferrite member 30 in the accommodating portion 62.

The resin passage groove 67 is a groove through which the molten resin flows (see FIG. 7 and the like). The resin passage groove 67 is provided in the upper plate inner wall portion 61 g. In the resin passage groove 67, recesses recessed from the reference surface T in the upper plate inner wall portion 61 g are formed linearly along the depth direction. The resin passage groove 67 has a bottom portion 67a and a side wall portion 67b. The bottom portion 67a is provided on one side of the resin passage groove 67 in the axial direction. The side wall portions 67b are provided on both sides of the bottom portion 67a in the width direction. In the resin passage groove 67, the passage width of the resin passage groove 67 is defined by the interval in the width direction of the side wall portion 67b, and the depth of the resin passage groove 67 is defined by the height of the side wall portion 67b in the axial direction. In the resin passage groove 67, for example, the depth of the resin passage groove 67 is equivalent to the depth of the shield holding groove 65a. The resin passage groove 67 extends linearly from the case opening 61f side to the rear plate 61e side in the upper plate inner wall portion 61g. In the resin passage groove 67, for example, one end of the resin passage groove 67 is located at the end of the upper plate inner wall portion 61g on the case opening 61f side, and the other end of the resin passage groove 67 is after the upper plate inner wall portion 61g. It is located on the end side of the plate portion 61e side. The resin passage groove 67 is located, for example, substantially in the center of the inner wall portion 61g of the upper plate in the width direction, and passes through the substantially center of the annular shield holding groove 65a. That is, the resin passage groove 67 vertically traverses the shield member 40 in contact with the shield holding groove 65a along the depth direction. The resin passage groove 67 is connected to the shield holding groove 65a at a point where it intersects with the shield holding groove 65a. The resin passage groove 67 is connected to the shield holding groove 65a, for example, at a first intersection G1 (see FIG. 7) that intersects the shield holding groove 65a on the rear plate portion 61e side. The resin passage groove 67 is further connected to the shield holding groove 65a at a second intersection G2 that intersects the shield holding groove 65a on the case opening 61f side.

The resin passage groove 67 is provided with a reinforcing rib 67c at the bottom 67a. The reinforcing rib 67c is, for example, a linear member extending along the extending direction of the resin passage groove 67, that is, the depth direction. The reinforcing rib 67c is formed, for example, to have a length equivalent to the length of the resin passage groove 67 in the extending direction. Specifically, in the reinforcing rib 67c, one end of the reinforcing rib 67c is located at the end of the upper plate inner wall portion 61g on the case opening 61f side, and the other end of the reinforcing rib 67c is on the upper side. It is located on the end side of the rear plate portion 61e side of the plate inner wall portion 61g. Two reinforcing ribs 67c are provided side by side at equal intervals along the width direction of the resin passage groove 67, for example. Since the reinforcing rib 67c is provided along the extending direction of the resin passage groove 67, the resin passage groove 67 should be reinforced so as not to interfere with the molten resin and air bubbles flowing through the resin passage groove 67. Can be done.

The resin communication port 70 is an opening through which at least one of the molten resin and air bubbles passes (see FIGS. 4, 5 and the like). The resin communication port 70 has a first communication port 71 and a second communication port 72. The first communication port 71 is formed by arranging the resin passage groove 67 of the outer case 60 and the first notch 43a of the shield member 40 so as to face each other along the axial direction at the first intersection point G1. .. That is, in the first communication port 71, the first groove portion 67d (see FIG. 7 and the like) located at the first intersection point G1 of the resin passage groove 67 and the first notch portion 43a of the shield member 40 are combined in the axial direction. It is formed by being The first communication port 71 is provided at a boundary portion M (see FIG. 3 and the like) between the upper plate inner wall portion 61 g of the outer case 60 and the first opening 41 of the shield member 40. The first communication port 71 is an opening that communicates the external space portion Q of the shield member 40 and the internal space portion P of the shield member 40. The first communication port 71 is provided on one side (rear plate portion 61e side) in the orthogonal direction (depth direction) orthogonal to the axis direction with reference to the axis X. The second communication port 72 is formed by arranging the resin passage groove 67 of the outer case 60 and the second notch 43b of the shield member 40 so as to face each other along the axial direction at the second intersection G2. NS. That is, in the second communication port 72, the second groove portion 67e (see FIG. 7 and the like) located at the second intersection point G2 of the resin passage groove 67 and the second notch portion 43b of the shield member 40 are combined in the axial direction. It is formed by being The second communication port 72 is provided at the boundary portion M between the upper plate inner wall portion 61 g of the outer case 60 and the first opening 41 of the shield member 40. The second communication port 72 is an opening that communicates the internal space portion P of the shield member 40 and the external space portion Q of the shield member 40. The second communication port 72 is provided on the other side (case opening 61f side) in the orthogonal direction (depth direction) orthogonal to the axis direction with reference to the axis X. The resin passage groove 67 connects the first groove portion 67d of the first communication port 71, the second groove portion 67e of the second communication port 72, and the connection groove portion 67f that connects the first groove portion 67d and the second groove portion 67e. It is composed by being done. The first communication port 71, the connection groove portion 67f, and the second communication port 72 form a distribution path L through which the molten resin can flow through the internal space portion P of the shield member 40. The molten resin flows into the internal space P of the shield member 40 from the external space Q of the shield member 40 through the first communication port 71, for example. The molten resin that has flowed into the internal space P flows through the distribution path L (connection groove 67f) and flows out from the internal space P of the shield member 40 to the external space Q of the shield member 40 via the second communication port 72. .. Further, the air bubbles flow into the internal space portion P of the shield member 40 from the external space portion Q of the shield member 40 through the first communication port 71, for example. The air bubbles that have flowed into the internal space P flow through the flow path L (connection groove 67f) and flow out from the internal space P of the shield member 40 to the external space Q of the shield member 40 via the second communication port 72. In the outer case 60, a detector mounting portion 68 on which a detector such as a thermistor (not shown) is mounted is provided on the upper plate inner wall portion 61 g (see FIG. 7 and the like).

As described above, the power transmission unit 1 according to the embodiment includes the power transmission coil 20, the shield member 40, and the mold member 50. The power transmission coil 20 is a coil capable of transmitting power in a non-contact manner with the power transmission coil on the other side. The shield member 40 is formed in a cylindrical shape around the axis X, and has an internal space portion P in which the power transmission coil 20 is provided inside, and a first opening 41 on one side in the axial direction along the axis X. Then, the shield member 40 shields the leakage magnetic field generated by the power transmission coil 20. The outer case 60 has a housing portion 62 and an upper plate inner wall portion 61 g. The accommodating portion 62 accommodates the power transmission coil 20 and the shield member 40. The upper plate inner wall portion 61g is a wall portion that closes the first opening 41 of the shield member 40 housed in the housing portion 62. The mold member 50 is filled in the accommodating portion 62 including at least the internal space portion P. The outer case 60 and the shield member 40 have a first communication port 71 and a second communication port 72. The first communication port 71 communicates the outer space portion Q, which is the outer space portion of the shield member 40, and the inner space portion P with the boundary portion M between the upper plate inner wall portion 61g and the first opening 41. The second communication port 72 is provided at a position different from that of the first communication port 71, and communicates the internal space portion P and the external space portion Q.

With this configuration, when the power transmission unit 1 is filled with the molten resin (insulating material) from the case opening 61f of the outer case 60, the first communication in which the molten resin of the external space portion Q of the shield member 40 is the inflow port. It can flow into the internal space P of the shield member 40 through the mouth 71. Then, in the power transmission unit 1, the molten resin that has flowed into the internal space P can flow out to the external space Q of the shield member 40 through the second communication port 72 that is the outlet. As a result, the power transmission unit 1 can appropriately secure the fluidity of the molten resin at the time of molding, and can spread the molten resin to every corner of the housing portion 62 of the housing. Further, when the electric power transmission unit 1 is filled with the molten resin from the case opening 61f of the outer case 60, the shield member 40 passes through the first communication port 71 where the air bubbles in the external space portion Q of the shield member 40 are the inflow port. Can flow into the internal space P of the. Then, in the power transmission unit 1, the air bubbles that have flowed into the internal space portion P can flow out to the external space portion Q of the shield member 40 through the second communication port 72 that is the outflow port. As a result, the power transmission unit 1 can prevent air bubbles from remaining in the housing portion 62 of the housing during molding, and can suppress cracking and peeling of the mold member 50 at the time of thermal shock due to a sudden temperature change. ..

In the power transmission unit 1, the first communication port 71 is provided on one side in the orthogonal direction orthogonal to the axis direction with reference to the axis X. The second communication port 72 is provided on the other side in the orthogonal direction with respect to the axis X. With this configuration, the power transmission unit 1 can form a distribution path L in which the molten resin flows linearly between the first communication port 71 and the second communication port 72. With this configuration, for example, in the power transmission unit 1, since the distribution path L follows the vertical direction (gravity direction) during molding, air bubbles that have flowed into the internal space P through the first communication port 71 enter the second communication port. It is possible to promote the outflow to the external space portion Q via 72.

In the power transmission unit 1, the first communication port 71 has a first groove portion 67d in which the upper plate inner wall portion 61 g is formed in a concave shape, and a first groove portion 67d in which the end portion of the opening of the shield member 40 is formed in a notch shape. It is formed by facing the notch portion 43a. The second communication port 72 is provided at a position different from that of the first groove portion 67d and is provided at a position different from that of the second groove portion 67e in which the upper plate inner wall portion 61g is formed in a concave shape and the first notch portion 43a. The end of the opening of 40 is formed by facing the second notch 43b formed in a notch shape.

In this way, the power transmission unit 1 forms the first communication port 71 by combining the first groove portion 67d and the first notch portion 43a. With this configuration, the power transmission unit 1 has, for example, an opening region of the first communication port 71 as compared with the case where the first communication port 71 is formed by the first groove portion 67d without providing the first notch portion 43a. When making the same, the depth of the first groove portion 67d can be made shallow. That is, since the power transmission unit 1 secures the opening area of the first communication port 71 by the first groove portion 67d and the first notch portion 43a, the opening area of the first communication port 71 is secured by the first groove portion 67d alone. The depth of the first groove portion 67d can be made shallower as compared with the case where the first groove portion 67d is used. With this configuration, the power transmission unit 1 can make the thickness of the bottom portion 67a of the first groove portion 67d thicker than that of the comparative example, and can suppress a decrease in the strength of the outer case 60. Further, since the power transmission unit 1 forms the first communication port 71 by combining the first groove portion 67d and the first notch portion 43a, for example, the first notch portion 43a is not provided without providing the first groove portion 67d. As compared with the case where the first communication port 71 is formed, the size of the first notch portion 43a can be reduced when the opening area of the first communication port 71 is made equivalent. That is, since the power transmission unit 1 secures the opening area of the first communication port 71 by the first groove portion 67d and the first notch portion 43a, the opening area of the first communication port 71 is secured by the first notch portion 43a alone. The size of the first notch portion 43a can be reduced as compared with the case of securing the above. With this configuration, the power transmission unit 1 can suppress the distribution of the leakage magnetic field of the power transmission coil 20 to the outside of the shield member 40, and can suppress the deterioration of the shield performance of the shield member 40. Further, since the power transmission unit 1 forms the second communication port 72 by combining the second groove portion 67e and the second notch portion 43b, the first communication port 71 described above is also used in the case of the second communication port 72. Can produce the same effect as.

In the power transmission unit 1, the upper plate inner wall portion 61g is formed in a concave shape and has a connecting groove portion 67f that connects the first groove portion 67d and the second groove portion 67e. With this configuration, the power transmission unit 1 can connect between the first communication port 71 and the second communication port 72 by the connection groove portion 67f, and thus between the first communication port 71 and the second communication port 72. The fluidity of the molten resin and bubbles in the above can be improved.

In the power transmission unit 1, the upper plate inner wall portion 61g is provided with a reinforcing rib 67c at least at the bottom portion 67a of the connection groove portion 67f. With this configuration, the power transmission unit 1 can improve the strength of the connection groove portion 67f and can prevent the outer case 60 from being deformed when the molten resin is filled.

In the power transmission unit 1, the internal space portion P is formed with a distribution path L through which the molten resin forming the mold member 50 can flow between the first communication port 71 and the second communication port 72. With this configuration, the power transmission unit 1 can improve the fluidity of the molten resin and air bubbles between the first communication port 71 and the second communication port 72.

[Modification example]
Next, a modified example of the embodiment will be described. The example in which the first communication port 71 is formed by the first groove portion 67d and the first notch portion 43a has been described, but the present invention is not limited thereto. The first communication port 71 may be formed by the first groove portion 67d without providing the first notch portion 43a, for example. In this case, the outer case 60 communicates with the boundary portion M between the upper plate inner wall portion 61 g and the first opening 41 with the outer space portion Q of the shield member 40 and the inner space portion P of the shield member 40. The first communication port 71 has a port 71, and the first communication port 71 is formed by a first groove portion 67d in which the upper plate inner wall portion 61 g is formed in a concave shape. Similarly, the example in which the second communication port 72 is formed by the second groove portion 67e and the second notch portion 43b has been described, but the present invention is not limited thereto. The second communication port 72 may be formed by the second groove portion 67e without providing the second notch portion 43b, for example. In this case, the outer case 60 communicates with the boundary portion M between the upper plate inner wall portion 61 g and the second opening 42 with the outer space portion Q of the shield member 40 and the inner space portion P of the shield member 40. The second communication port 72 has a port 72, and the second communication port 72 is formed by a second groove portion 67e in which the upper plate inner wall portion 61 g is formed in a concave shape.

Further, the first communication port 71 may be formed by the first notch portion 43a without providing the first groove portion 67d, for example. In this case, the shield member 40 communicates with the boundary portion M between the upper plate inner wall portion 61 g and the first opening 41 with the outer space portion Q of the shield member 40 and the inner space portion P of the shield member 40. The first communication port 71 has a port 71, and the first communication port 71 is formed by a first notch portion 43a in which the end portion of the first opening 41 of the shield member 40 is formed in a notch shape. Similarly, the second communication port 72 may be formed by, for example, the second notch portion 43b without providing the second groove portion 67e. In this case, the shield member 40 communicates with the boundary portion M between the upper plate inner wall portion 61 g and the second opening 42 with the outer space portion Q of the shield member 40 and the inner space portion P of the shield member 40. The second communication port 72 has a port 72, and the second communication port 72 is formed by a second notch portion 43b in which the end portion of the second opening 42 of the shield member 40 is formed in a notch shape.

Further, the example in which the power transmission unit 1 has two communication ports of the first communication port 71 and the second communication port 72 has been described, but the present invention is not limited thereto. The power transmission unit 1 may have two or more communication ports.

Further, the power transmission unit 1 has described an example in which the first communication port 71 and the second communication port 72 face each other, but the present invention is not limited to this. In the power transmission unit 1, it is sufficient that the distribution path L can be formed by the first communication port 71 and the second communication port 72, and the first communication port 71 and the second communication port 72 do not have to face each other. ..

Further, the power transmission unit 1 has described an example in which the first groove portion 67d and the second groove portion 67e are connected by the connection groove portion 67f to form the distribution path L, but the present invention is not limited to this. In the power transmission unit 1, for example, the first groove portion 67d and the second groove portion 67e may not be connected by the connection groove portion 67f. That is, the power transmission unit 1 may form a distribution path L from the first groove portion 67d and the second groove portion 67e without providing the connection groove portion 67f.

Further, although the power transmission unit 1 has described an example in which the connecting groove portion 67f is provided with the reinforcing rib 67c, the connecting groove portion 67f may not be provided with the reinforcing rib 67c.

Further, the example in which the power transmission coil 20 is formed in a spiral shape has been described, but the present invention is not limited to this. The power transmission coil 20 may be, for example, a spiral coil or a solenoid coil.

Further, the power transmission unit 1 may include a communication unit that communicates with the power transmission unit 1 on the other side.

1 Power transmission unit 20 Power transmission coil 40 Shield member 41 First opening (opening)
43a 1st notch 43b 2nd notch 50 Mold member 60 Outer case 61g Upper plate inner wall (closed wall)
62 Accommodating part 67a Bottom 67c Rib 67d 1st groove 67e 2nd groove 67f Connection groove 71 1st communication port 72 2nd communication port L Distribution path M Boundary part P Internal space part Q External space part X Axis line

Claims (6)

A power transmission coil that can transmit power without contact with the power transmission coil on the other side,
A leakage magnetic field generated by the power transmission coil, which is formed in a tubular shape around the axis and has an internal space in which the power transmission coil is provided and an opening on one side in the axis direction along the axis. With a shield member that shields
A housing having a housing portion for accommodating the power transmission coil and the shield member, and a closing wall portion which is a wall portion for closing the opening of the shield member housed in the housing portion.
A mold member that fills the accommodating portion including at least the internal space portion is provided.
At least one of the housing or the shield member communicates the external space portion, which is the outer space portion of the shield member, and the internal space portion with the boundary portion between the closed wall portion and the opening portion. A power transmission unit having a communication port and a second communication port provided at a position different from the first communication port and communicating the internal space portion and the external space portion. The first communication port is provided on one side in an orthogonal direction orthogonal to the axis direction with reference to the axis.
The power transmission unit according to claim 1, wherein the second communication port is provided on the other side in the orthogonal direction with respect to the axis. In the first communication port, the first groove portion in which the closing wall portion is formed in a concave shape and the first notch portion in which the end portion of the opening portion of the shield member is formed in a notch shape face each other. Formed by
The second communication port is provided at a position different from that of the first groove portion and is provided at a position different from that of the second groove portion in which the closing wall portion is formed in a concave shape and the first notch portion of the shield member. The power transmission unit according to claim 1 or 2, wherein the end portion of the opening is formed so as to face the second notch formed in a notch shape. The power transmission unit according to claim 3, wherein the closed wall portion is formed in a concave shape and has a connecting groove portion that connects the first groove portion and the second groove portion. The power transmission unit according to claim 4, wherein the closed wall portion is provided with a reinforcing rib at least at the bottom of the connecting groove portion. The internal space portion is any one of claims 1 to 5, wherein a distribution path through which the insulating material forming the mold member can flow between the first communication port and the second communication port is formed. The power transmission unit described in.

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