JP2016009687A - Coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil unit in which a holding member holding a cover to a case is prevented from generating heat and is suppressed from being damaged.SOLUTION: A coil unit includes: a resin-made case 13 having an opening; a coil 17 received in the case while a coil axis is directed in a direction not crossing the opening; a cover 15 covering the opening; and a holding part allowing the case to hold the cover. The holding part allows a resin-made holding member 51 to hold the cover to a side wall 25 of the case, a magnetic flux of the coil 17 passing through the side wall.

Description

  The present invention relates to a coil unit for a vehicle that is fed in a non-contact manner.

  As a device for supplying power from the outside to a power supply device mounted on a vehicle such as an electric car or a hybrid car, a non-contact power feeding device using electromagnetic induction between coils is known. This type of power supply apparatus includes a power supply coil unit in which a primary coil is housed in an insulating case, and a power receiving coil unit in which a secondary coil is housed in an insulating case. The coil unit is fixed to the ground such as a parking lot, and the coil unit for receiving power is attached to the lower surface of the vehicle body.

  The vehicle stops at a predetermined position where the power receiving coil unit faces the power feeding coil unit. In this state, an AC voltage is applied from the power supply on the infrastructure side to the primary coil of the coil unit for power supply, whereby an AC magnetic field is generated from the primary coil, and an induced electromotive force is generated in the secondary coil by electromagnetic induction. When an induced electromotive force is generated in the secondary coil, it is transmitted to and stored in a vehicle-side power supply device connected to the power receiving coil unit (see, for example, Patent Document 1).

  FIG. 6 shows an example of a coil unit for receiving power. The coil unit 91 includes a resin case 92 having an opening, an electrical component such as a secondary coil accommodated in the case 92, and a resin cover 93 that covers and seals the opening of the case 92. Composed. The secondary coil is disposed on the side wall 94 of the case 92 with the coil axis directed.

  The cover 93 is fixed to the case 92 by, for example, passing a plurality of metal bolts passed through the bolt holes from below through the bolt holes of the case 92 and tightening them with nuts. In the case of FIG. 6, fastening with bolts 95 is made at a total of six places on both ends in the width direction (X direction), and fastening with bolts 96 is made at four places inside these. The case 92 is attached to the vehicle body by fastening a bolt that is passed through the bolt hole 98 of the projection 97 extending in the width direction to the lower surface of the vehicle body.

JP 2012-16106 A

  By the way, in this kind of coil unit 71, as shown by the arrow of FIG. 6, the loop-shaped magnetic flux which penetrates a coil generate | occur | produces. When a magnetic flux is generated in this way, an eddy current may flow through the bolt 96 that the magnetic flux crosses and the bolt 96 may generate heat. When the expansion and contraction of the bolt 96 are repeated due to such heat generation of the bolt 96, a crack or the like may occur in the case 92 supporting the bolt 96, and the bolt may be loosened or missing.

  As a method of suppressing the heat generation of the bolt due to the influence of such a magnetic flux, it is conceivable to arrange the bolt at a position away from the coil. In this case, however, the coil unit is increased in size.

  Although it is conceivable to replace the metal bolt with a resin bolt, the resin bolt has a lower strength than the metal bolt, and thus may damage the bolt when the bolt is tightened. Further, when a resin bolt is attached from below the coil unit, a stepping stone or the like may collide with the head of the bolt and the bolt may be damaged, and the sealing performance between the case and the bolt may be reduced.

  This invention is made | formed in view of such a problem, and makes it a subject to suppress the heat generation of the holding member holding a cover in a case, and to suppress damage to a holding member.

  In order to solve the above problems, a coil unit of the present invention includes a resin case having an opening, a coil accommodated in the case with a coil axis facing a direction not intersecting the opening, a cover covering the opening, and a case. A holding portion for holding the cover, and the holding portion holds the cover with a resin-made holding member on a side wall of the case through which the magnetic flux of the coil passes.

  According to this, since a cover is hold | maintained by the resin-made holding member in the side wall of the case where magnetic flux passes among holding | maintenance parts, heat_generation | fever of a holding member can be prevented. Further, in the coil unit on the power receiving side (vehicle side) that accommodates the secondary coil, the holding member can be attached from the side wall of the case, that is, from the lateral direction without attaching the holding member from below the coil unit. It is possible to prevent the holding member from being damaged or dropped due to a collision of a stepping stone or the like from below or road surface interference. The coil unit of the present invention can be applied to both the power feeding side and the power receiving side.

  In this case, the cover has an edge portion facing the side surface of the side wall of the case, and the holding portion has a first mounting hole formed in the edge portion, and a side surface of the side wall facing the first mounting hole. The bottomed second mounting hole formed on the holding member and the holding member inserted into the first and second mounting holes, the holding member being locked in the second mounting hole And can be fitted into the first mounting hole.

  According to this, since the cover is held via the holding member locked to the case side, the burden on the holding member is reduced as compared with the case where the holding member is locked to both the case and the cover. be able to. For this reason, it is possible to reliably prevent the holding member from being damaged. The holding member only prevents the cover from shifting with respect to the side wall of the case, but the cover can be fixed to the side wall of the case through which magnetic flux does not pass by using a metal bolt or the like. , Can secure a sufficient holding force of the cover.

  Specifically, the holding member is provided with a leg portion having a locking claw inserted into the second mounting hole and locked, and a head portion fitted in the first mounting hole. It can be.

  According to this, even if an external force that presses the head from below, for example, acts on the holding member, it is possible to prevent stress from concentrating on the locking claws, and thus it is possible to more reliably prevent damage to the holding member. it can.

  Further, the cover can be held by the case via a rubber packing attached to the periphery of the opening of the case.

  According to this, since the gap between the case and the cover can be sealed with the rubber packing, and the positional deviation between the case and the cover can be absorbed with the rubber packing, the external force applied to the holding member is reduced. The effect which prevents damage to a holding member can be anticipated.

  According to the present invention, heat generation and damage of the holding member can be suppressed.

1 is an external perspective view of a coil unit to which the present invention is applied. It is a disassembled perspective view of the coil unit to which this invention is applied. It is an external appearance perspective view of a holding member. It is sectional drawing which expands and shows the state in which the holding member was assembled | attached. It is a cross-sectional view of a coil unit to which the present invention is applied. It is an external appearance perspective view of the conventional coil unit for power reception.

  Hereinafter, an embodiment of a coil unit to which the present invention is applied will be described with reference to the drawings. FIG. 1 is an external perspective view of the coil unit, and FIG. 2 is an exploded perspective view of the coil unit of FIG. In the following description, a power receiving coil unit will be described as an example, but the present invention can also be applied to a power feeding coil unit.

  As shown in FIG. 1, the coil unit 11 of the present embodiment forms a sealed container by covering a resin case 13 with a resin cover 15, and a secondary coil 17, a capacitor 19, and the like are formed in the container. It is configured to accommodate the electrical parts. The coil unit 11 is attached to the lower surface (bottom surface) of the vehicle body with at least the lower surface (bottom wall 23) of the case 13 exposed. In the following description, the arrow X in FIG. 1 is the width direction of the coil unit 11, the arrow Y is the front-rear direction (the left side in the figure is the front direction), and the arrow Z is the vertical direction (the upper side in the figure is the upward direction). These definitions also apply to other drawings. However, the X direction and the Y direction do not necessarily coincide with the front-rear direction and the width direction of the vehicle.

  The secondary coil 17 generates an induced electromotive force by electromagnetic induction of an alternating magnetic field generated by a primary coil housed in a coil unit on the power supply side (not shown). The induced electromotive force generated in the secondary coil 17 is transmitted to and stored in a power supply device such as a battery (not shown) via an electric wire 21 connected to the capacitor 19. As the secondary coil 17, a known coil is used in which a wire is wound around a ferrite formed in a rectangular plate shape.

  The case 13 includes a rectangular bottom wall 23 and a side wall 25 that rises in a frame shape from the periphery of the bottom wall 23, and is formed with an opening upward. In addition, as shown in FIG. 2, projections 27 projecting in the width direction from the side walls 25 are provided at the four corners of the case 13, and two bolt holes 29, 31 are provided in each projection 27. It is formed. The bolt hole 29 is a bolt hole through which a bolt for fixing the case 13 to the lower surface of the vehicle body is inserted, and the bolt hole 31 is a bolt hole through which a bolt for fixing the cover 15 to the case 13 is inserted. At both ends in the width direction (X direction) of the case 13, protrusions 33 that have bolt holes 31 and protrude in the width direction are formed between adjacent protrusions 27.

  Inside the case 13, electrical components such as the secondary coil 17 and the capacitor 19 are held at predetermined positions. The secondary coil 17 is disposed so that the coil axis is directed parallel to the front-rear direction (Y direction) of the case 13 and penetrates the front and rear side walls 25. The secondary coil 17 does not necessarily have a coil axis parallel to the front-rear direction of the case 13, but needs to be disposed so as to penetrate the front and rear side walls 25 without intersecting at least the opening. FIG. 2 shows a state in which a resin sheet material 34 is placed on the secondary coil 17. An annular step portion (not shown) is provided on the periphery of the opening of the case 13 (the upper end surface of the side wall 25), and an annular rubber packing 35 is mounted along the step portion.

  As shown in FIG. 2, the cover 15 includes a rectangular top plate 37 and edge portions 39 that hang from both ends of the top plate 37 in the front-rear direction, and is formed in a U-shaped cross section as a whole. The top plate 37 is provided with a protruding portion 41 protruding in the width direction at a position corresponding to each bolt hole 31 of the case 13, and a bolt hole 43 is formed in each protruding portion 41. The cover 15 is covered so that the side wall 25 in the front-rear direction of the case 13 and the edge portion 39 overlap each other, and is assembled to the case 13 so as to close the opening of the case 13. The cover 15 assembled to the case 13 is fixed to the case 13 by a metal bolt 45 passed through the bolt hole 31 on the case 13 side being passed through the bolt hole 43 of each protrusion 41 and fastened with a nut. . The bolt holes 31 and 43 and the bolt 45 constitute a first holding part that holds the cover 15 on the case 13.

  On the other hand, each of the edge portions 39 of the cover 15 is provided with five first mounting holes 47, and the side surfaces of the side wall 25 in the front-rear direction of the case 13 are respectively positioned at positions facing the first mounting holes 47. Five second mounting holes 49 are provided. The mounting holes 47 and 49 are arranged so that the positions of the holes coincide with each other in a state where the edge portions 39 are opposed to the side wall 25, and the insertion holes 47 and 49 are provided with resin holding members 51. Is assembled. The first and second mounting holes 47 and 49 and the holding member 51 constitute a second holding portion that holds the cover 15 on the case 13.

  The case 13 and the cover 15 are fixed in a state in which the gap between them is sealed with the rubber packing 35, and prevents water, dust, etc. from entering the case 13. In addition, although the electric wire 21 is extracted from the through-hole of the electric-wire extraction port 53 provided in the side wall 25 of the case 13, the gap between the through-hole and the electric wire 21 causes the cylindrical electric wire holding member 55 to be connected to the electric wire 21. By mounting on the outer peripheral surface, it is hermetically sealed.

  Next, the configuration of the holding member 51 will be described. The holding member 51 is formed of an insulating resin, and as shown in FIG. 3, a head 57 formed in an oval shape, a pair of legs 59 erected from the same surface of the head 57, and a pair of A block-like first support 61 that stands from the head 57 between the legs 59, and a second support 63 that stands from the head 57 on the opposite side of the pair of legs 59 from the first support 61, respectively. Have. Each of the pair of leg portions 59 is provided with a locking claw 65 protruding in a direction away from the side surface of the protruding tip portion, and an inclined surface 67 is formed on the tip surface of each locking claw 65. The pair of leg portions 59 are provided separately from the first support column 61 and the second support column 63 in the longitudinal direction of the head portion 57.

  Each first support 61 has a thickness in the width direction orthogonal to the longitudinal direction of the head 57 set to be the same as the thickness of the head 57, and the height standing from the head 57 is higher than the height of the leg 59. It is set slightly higher. As for the 1st support | pillar 61, the dent 69 is formed in the both end surfaces of the width direction, respectively. Each second support column 63 is erected along the arc-shaped side surfaces at both ends in the longitudinal direction of the head portion 57, and the height of the second column 63 is set lower than the leg portion 59.

  FIG. 4 is a cross-sectional view of the second holding portion to which the holding member 51 is assembled. The holding member 51 is inserted into an overlapping hole between the first mounting hole 47 of the edge 39 of the cover 15 and the second mounting hole 49 of the side wall 25 of the case 13. The first mounting hole 47 is a through-hole formed in a cross-sectional shape similar to the head 57 of the holding member 51, and the head 57 can be fitted therein. The second mounting hole 49 is a bottomed hole having an opening area smaller than that of the first mounting hole 47, and is provided with a wall of an opening edge portion 73 that partitions the bottom surface 71 and the first mounting hole 47. The opening edge portion 73 is formed with a through hole 75 into which the pair of leg portions 59 and the first support column 61 are respectively inserted. The inner surface of the through hole 75 has an inclined surface 77 whose opening area decreases toward the back side in the insertion direction.

  When the holding member 51 is inserted into the first mounting hole 47, the inclined surfaces 67 of the locking claws 65 of the pair of leg portions 59 abut against the opening edge portion 73. When the holding member 51 is further pushed in, the respective locking claws 65 are elastically deformed in a direction in which the pair of leg portions 59 approach each other and are guided into the through hole 75 of the second mounting hole 49. The locking claw 65 guided into the through hole 75 moves along the inclined surface 77 and climbs over the through hole 75, whereby the leg portion 59 is elastically restored and the opening edge 73 as shown in FIG. 4. It is locked to. Thus, the holding member 51 is locked (held) to the side wall 25 of the case 13 through the second mounting hole 49, and the head 57 is fitted into the first mounting hole 47. At this time, in the holding member 51, the second support 63 is in contact with the opening edge 73, but the first support 61 is also in contact with the bottom surface 71 of the second mounting hole 49. Further, the head 57 is disposed flush with the outer surface of the cover 15 or is recessed from the outer surface.

  Thus, in the coil unit 11 of the present embodiment, in the first holding portion positioned in the width direction, the cover 15 is attracted to the case 13 using the metal bolt 45, and the second holding portion in the front-rear direction. The cover 15 is held via a resin holding member 51 locked to the case 13.

  Here, in the case of the coil unit 11 of the present embodiment, as indicated by the arrows in FIG. 1, the magnetic flux of the secondary coil 17 is generated around the coil axis in the front-rear direction. Since this magnetic flux is formed in a loop shape through the side wall 25 in the front-rear direction of the case 13, it passes through the second holding part without passing through the first holding part. Therefore, even if a metal bolt is used in the first holding portion, the magnetic flux does not pass through and therefore no heat is generated. Further, magnetic flux passes through the second holding portion, but since the holding member 51 is formed of an insulating resin, it does not generate heat.

  Moreover, in this embodiment, since the holding member 51 is attached from the lateral direction (horizontal direction) of the case 13 without being attached from below the coil unit, it is caused by road surface interference or a collision with a stepping stone or the like when the vehicle is traveling. Damage to the holding member 51 can be prevented.

  Further, the coil unit 11 of the present embodiment has a structure in which the cover 15 is held by the holding member 51 held on the case 13 side so as to sandwich the second mounting hole 49 of the case 13. However, the load applied to the holding member can be reduced as compared with the structure in which both the case 13 and the cover 15 are held, and damage to the holding member 51 formed of resin can be prevented. The cover 15 only prevents the edge 39 from shifting along the side wall 25 of the case 13 because the holding member 51 is only fitted in the first mounting hole 47. Since the cover 15 is held by the case 13 by the first holding portion, the cover 15 can be stably held.

  Further, the holding member 51 is formed so that the first support 61 can come into contact with the bottom surface 71 of the second mounting hole 49, so that when the external force in the pressing direction is applied to the head 57, the first support 61 is The holding member 51 can be supported to prevent deformation. Further, the first support column 61 may be arranged away from the bottom surface 71. Even with this configuration, since an external force acts on the leg 59 in a direction in which the locking claw 65 moves away from the opening edge 73, it is possible to prevent stress from being concentrated on the locking claw 65. Breakage of the pawl 65 can be prevented. Further, since the holding member 51 has a structure in which the head 57 is fitted into the first mounting hole 47 and does not protrude outward from the outer surface of the cover 15, a stepping stone or the like collides with the head 57. It can be surely prevented.

  In the present embodiment, as shown in FIG. 5, since the rubber packing 35 is attached between the case 13 and the cover 15, the rubber packing 35 is provided with a cushioning material between the case 13 and the cover 15. It has become. For this reason, even if a relative shift occurs between the case 13 and the cover 15 due to vibration or the like, for example, the external force applied to the holding member 51 can be reduced by absorbing the rubber packing 35, and as a result. Damage to the holding member 51 can be prevented.

  As mentioned above, although embodiment of this invention was explained in full detail with drawing, said embodiment is only an illustration of this invention, It can change and change within the range described in the claim. is there.

  For example, in the present embodiment, in the second holding portion, the holding member 51 is placed in the lateral direction in the mounting holes formed in the side surface of the side wall 25 of the case 13 and the edge portion 39 of the cover 15 facing the side surface. However, the present invention is not limited to this, and the second mounting hole 49 is formed in the vertical direction, for example, the upper end surface of the side wall 25 of the case 13, and the second plate is formed in the top plate 37 of the cover 15. The mounting hole 49 can be formed, and the holding member 51 can be assembled downward from above the coil unit 11. According to this, since the head 57 is covered with the lower part of the vehicle body, the holding member 51 can be reliably prevented from colliding with a stepping stone or the like without being exposed to the outside. The first holding unit is not limited to the holding structure of the present embodiment, and a known holding member other than the metal bolt 45 can be used.

  Further, in the present embodiment, an example in which the holding member 51 is configured as a so-called resin clip has been described. However, the fixing member is not limited to this example as long as the fixing member holds the cover 15 on the side wall 25 of the case 13. For example, a resin bolt or the like can be used.

11 Coil unit 13 Case 15 Cover 17 Secondary coil 25 Side wall 31, 43 Bolt hole 35 Rubber packing 39 Edge 47 First mounting hole 49 Second mounting hole 51 Holding member 57 Head 59 Leg 65 Locking claw

Claims (4)

A resin case having an opening; a coil accommodated in the case with a coil axis directed in a direction not intersecting with the opening; a cover covering the opening; and a holding portion for holding the cover in the case. ,
The holding unit is a coil unit in which the cover is held by a resin holding member on a side wall of the case through which the magnetic flux of the coil passes. The cover is formed with an edge facing the side surface of the side wall of the case,
The holding portion includes a first mounting hole formed in the edge, a bottomed second mounting hole formed in a side surface of the side wall facing the first mounting hole, and the first The holding member inserted into the second mounting hole,
The coil unit according to claim 1, wherein the holding member is fitted in the first mounting hole in a state of being locked in the second mounting hole.   The said holding member is formed with the leg part which has the latching claw inserted in the said 2nd attachment hole, and is latched, and the head fitted to the said 1st attachment hole. The coil unit according to 2.   The coil unit according to claim 2 or 3, wherein the cover is held by the case via a rubber packing attached to a peripheral edge of the opening of the case.

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