Coil Unit

Abstract

To provide a coil unit which can improve serviceability of a device and a member on a power transmission side while ensuring an output and efficiency of desired charging / feeding power.SOLUTION: A coil unit comprises: a housing 11 which houses a coil 21; and a core member 12. The core member 12 is inserted into a hollow region 21a of the coil 21, and it penetrates the housing 11 so as to protrude to the outside. The core member 12 has: a wall part 12b which is disposed in the hollow region 21a; and a lid part 12c which opens / closes an opening end of the wall part 12b.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development have been carried out on charging and discharging of vehicles equipped with secondary batteries that contribute to energy efficiency. Conventionally, in a non-contact power transmission system that supplies power to a vehicle from outside the vehicle by non-contact power transmission, a structure in which a coil unit on the power transmission side is buried in a road surface is known (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the technology related to charging and discharging of vehicles equipped with secondary batteries, it is desired to improve the maintainability of the equipment on the power transmission side while ensuring the desired charging and discharging output and efficiency. For example, in the coil unit on the power transmission side of the above conventional technology, when it is buried in the road surface while being housed in a housing, there arises a problem that various maintenance operations for the equipment and members on the power transmission side require complicated labor.

[0005] An object of the present invention is to provide a coil unit that can improve the maintainability of power transmission side devices and members while ensuring desired charging and discharging output and efficiency. And it contributes to energy efficiency improvement.

Means for Solving the Problems

[0006] In order to solve the above problems and achieve the above object, the present invention adopts the following aspects. (1): A coil unit (for example, coil unit 10 in the embodiment) according to an aspect of the present invention includes a coil (for example, coil 21 in the embodiment) that transmits power to a power receiving device (for example, power receiving device T in the embodiment) in a non-contact manner, a housing (for example, housing 11 in the embodiment) that houses the coil, and a core member (for example, core member 12 in the embodiment) that is inserted into the hollow region (for example, hollow region 21a in the embodiment) of the coil and protrudes to the outside through the housing. The core member includes a frame-shaped wall portion (for example, wall portion 12b in the embodiment) disposed in the hollow region and a lid portion (for example, lid portion 12c in the embodiment) that opens and closes the open end of the wall portion. , the surface of the lid portion (for example, the upper surface 12A in the embodiment) is exposed to the outside from the road surface (for example, the road surface S in the embodiment). and.

[0007] (2): In the coil unit according to (1) above, the surface (for example, upper surface 12A in the embodiment) of the lid portion may have higher visibility than the road surface. The It may have higher visibility than the road surface.

[0008] (3): The coil unit according to (1) or (2) above may include a support member (for example, support member 13 in the embodiment) that supports the housing and the core member and has a through hole (for example, through hole 13a in the embodiment) that communicates with a hollow internal space (for example, internal space 12e in the embodiment) surrounded by the wall portion.

Effects of the Invention

[0009] According to the above (1), the core member that is arranged in the hollow region of the coil to improve the coupling coefficient is provided with a lid portion that opens and closes the open end of the wall portion, so that the hollow internal space surrounded by the wall portion can be opened to the outside by the lid portion. Various devices and members arranged in the internal space of the wall portion or other internal spaces communicating with the internal space of the wall portion can be easily exposed to the outside, and the ease of various maintenance operations can be improved. Also, by exposing the surface of the lid portion to the outside from the road surface, for example, when the lid portion is buried inside the traveling road, the distance between the power receiving device mounted on a moving body such as a vehicle and the coil unit can be increased. It is possible to suppress the increase.

[0010] In the case of the above (2), Lid portion Since the surface has higher visibility than the road surface, a moving body such as a vehicle equipped with a power receiving device can be easily guided to the coil unit.

[0011] In the case of the above (3), by providing a support member in which a through hole communicating with the hollow internal space surrounded by the wall portion is formed, various devices and members arranged in the through hole of the support member or other internal spaces communicating with the through hole of the support member can be easily exposed to the outside, and the ease of various maintenance operations can be improved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0013] Hereinafter, a coil unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing the configuration of the coil unit 10 in the embodiment. FIG. 2 is an exploded perspective view showing the configuration of the coil unit 10 in the embodiment. FIG. 3 is a cross-sectional view showing the coil unit 10 in the embodiment cut by the Y-Z plane at the position of the A-A line shown in FIG. 1. Hereinafter, the axial directions of the X-axis, Y-axis, and Z-axis that are orthogonal to each other in the three-dimensional space are directions parallel to each axis. For example, as shown in FIGS. 1 to 3, the Z-axis direction is parallel to the vertical direction of the coil unit 10 such as the vertical direction, and the X-axis direction and the Y-axis direction are directions orthogonal to the vertical direction of the coil unit 10 such as the horizontal direction.

[0014] The coil unit 10 of the embodiment constitutes a part of a non-contact power transmission system that supplies power to the power receiving device T of a moving body from the outside of the moving body, such as a vehicle, by non-contact power transmission. The coil unit 10 of the embodiment is provided, for example, in a power transmission device installed on a traveling road of a vehicle or the like. The coil unit 10 of the embodiment is disposed, for example, on the upper part of a square tubular manhole MH buried underground on a traveling road of a vehicle or the like. In the internal space of the manhole MH, various devices and members constituting a power transmission device of a non-contact power transmission system are accommodated, for example.

[0015] As shown in FIGS. 1, 2, and 3, the coil unit 10 includes, for example, a housing 11, a core member 12, a support member 13, a coil 21, an insulating member 22, and a ferrite core 23. The outer shape of the housing 11 is formed in a rectangular frame shape, for example. The housing 11 is provided so as to surround, for example, the coil 21, the insulating member 22, and the ferrite core 23 described later on the upper side in the vertical direction and the inner and outer sides in the direction orthogonal to the vertical direction. The housing 11 houses the coil 21, the insulating member 22, and the ferrite core 23 described later.

[0016] The core member 12 includes, for example, a plate portion 12a, a wall portion 12b, and a lid portion 12c. The core member 12 is formed of a magnetic material such as an electromagnetic steel sheet such as a silicon steel sheet, for example. The outer shape of the plate-like portion 12a is formed, for example, in a rectangular frame shape with a through-hole 12d penetrating in the thickness direction formed in the central portion. The plate-like portion 12a is arranged, for example, so as to be laminated on the lower side of the housing 11 in the vertical direction, thereby forming an accommodation space for accommodating the coil 21, the insulating member 22, and the ferrite core 23 between the plate-like portion 12a and the inner surface of the housing 11.

[0017] The outer shape of the wall portion 12b is formed, for example, in a rectangular frame shape protruding upward in the vertical direction from the peripheral portion surrounding the through-hole 12d of the plate-like portion 12a. The wall portion 12b is disposed in the hollow region 21a of the coil 21 and the through-holes 22a and 23a of the insulating member 22 and the ferrite core 23, which will be described later. The wall portion 12b protrudes upward from the upper surface 11A of the housing 11 by being inserted into the through-hole 11a of the housing 11. The outer shape of the lid portion 12c is formed, for example, in a rectangular plate shape. The lid portion 12c opens and closes the upper opening end of the wall portion 12b. The upper surface 12A of the lid portion 12c is formed to have higher visibility than the road surface S of the travel path where the coil unit 10 is provided, for example, by at least any one of appropriate coloring, pattern, and display.

[0018] The outer shape of the support member 13 is formed, for example, in a rectangular plate shape with a through-hole 13a formed in the thickness direction. The support member 13 is disposed, for example, above the manhole MH and supports the housing 11 and the core member 12.

[0019] The outer shape of the coil 21 is formed, for example, in a spiral shape along the inner surface of the housing 11. The outer shape of the insulating member 22 is formed, for example, in a rectangular sheet shape with a through-hole 22a formed in the thickness direction. The insulating member 22 is formed of a material having electrical insulation properties. The outer shape of the ferrite core 23 is formed, for example, in a rectangular plate shape with a through-hole 232a formed in the thickness direction. The coil 21, the insulating member 22, and the ferrite core 23 are sequentially laminated along the vertical direction and disposed inside the housing 11.

[0020] As shown in FIG. 3, the coil unit 10 is disposed, for example, on the upper part of a manhole MH buried in the ground E, and is fixed by a paving material AS such as concrete or asphalt that forms a road surface for vehicles and the like. The coil unit 10 is arranged, for example, such that the road surface S of the road and the upper surface 12A of the lid portion 12c of the core member 12 form the same plane. In the coil unit 10, the hollow internal space 12e surrounded by the wall portion 12b of the core member 12, the through hole 13a of the support member 13, and the internal space Ma of the manhole MH communicate with each other. For example, when the upper opening end of the wall portion 12b is opened by removing the lid portion 12c of the core member 12, the through hole 13a of the support member 13 and the internal space Ma of the manhole MH are opened to the outside. For example, the lid portion 12c of the core member 12 exposes various devices and members that constitute the power transmission device of the non-contact power transmission system housed in the internal space Ma of the manhole MH to the outside by opening the upper opening end of the wall portion 12b.

[0021] As described above, according to the coil unit 10 of the embodiment, the core member 12 that improves the coupling coefficient by being disposed in the hollow region 21a of the coil 21 includes a lid portion 12c that opens and closes the upper opening end of the wall portion 12b, so that the hollow internal space 12e surrounded by the wall portion 12b can be opened to the outside by the lid portion 12c. Various devices and members arranged in the internal space 12e of the wall portion 12b or other internal spaces communicating with the internal space 12e of the wall portion 12b can be easily exposed to the outside, and the ease of various maintenance operations can be improved.

[0022] By providing the support member 13 in which the through hole 13a communicating with the hollow internal space 12e surrounded by the wall portion 12b is formed, various devices and members arranged in the through hole 13a of the support member 13 or other internal spaces communicating with the through hole 13a of the support member 13 can be easily exposed to the outside, and the ease of various maintenance operations can be improved. The internal space 12e of the wall portion 12b, the through hole 13a of the support member 13, and the internal space Ma of the manhole MH communicate with each other, so that, for example, even when various devices and members constituting the power transmission device of the non-contact power transmission system are accommodated in the internal space Ma of the manhole MH, the maintainability can be improved.

[0023] Since the upper surface 12A of the lid portion 12c is exposed to the outside from the road surface S, the distance between the power receiving device mounted on a moving body such as a vehicle and the coil unit 10 can be suppressed from increasing as compared with, for example, the case where the lid portion 12c is buried inside the traveling road. By suppressing an increase in the magnetic path length, the output and efficiency of non-contact power transmission can be improved. Since the upper surface 12A of the lid portion 12c has higher visibility than the road surface S, a moving body such as a vehicle on which the power receiving device is mounted can be easily guided to the coil unit 10. For example, in the case of a moving body equipped with a device that detects a lane marking or the like on the traveling road and controls driving support, the upper surface 12A of the lid portion 12c can be accurately detected. Since the accuracy of alignment between the power receiving device mounted on the moving body and the coil unit 10 can be improved, the output and efficiency of non-contact power transmission can be improved.

[0024] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0025] 10… Coil unit, 11… Housing, 12… Core member, 12a… Plate-like portion, 12b… Wall portion, 12c… Cover portion, 12d… Through-hole, 12e… Internal space, 12A… Upper surface (surface), 13… Support member, 13a… Through-hole, 21… Coil, 21a… Air-core region, 22… Insulating member, 23… Ferrite core, 15… Coil, S… Road surface, T… Power receiving device, MH… Manhole, Ma… Internal space.

Claims

1. a coil for transmitting power to a power receiving device in a non-contact manner; A housing that houses the coil; a core member that is inserted into the hollow core region of the coil and protrudes to the outside through the housing; Equipped with The core member is a frame-shaped wall portion disposed in the air-core region; a cover portion for opening and closing the open end of the wall portion; Equipped with The surface of the cover is exposed to the outside from the road surface. Coil unit.

2. The surface of the lid portion has higher visibility than the road surface. The coil unit according to claim 1 .

3. a support member that supports the housing and the core member and has a through hole that communicates with a hollow internal space surrounded by the wall portion; The coil unit according to claim 1 or 2.

Images