JP2020018074A - Power transmission device and vehicle charging method - Google Patents

Abstract

An object of the present invention is to provide a power transmission device and a vehicle charging method capable of preventing a foreign object or a living body from entering a power transmission device.
A power transmission unit (1) has a power transmission coil (3), a power transmission surface (2a) extending along a direction perpendicular to the axial direction of the power transmission coil, and a case (2) for housing the power transmission coil and a case (2) along the axial direction. And an urging member 5 for urging the power transmission surface side. When the vehicle stops above the case, the case urged by the urging member contacts the power receiving unit of the vehicle. The power transmission coil is supported by the case, and the case and the power transmission coil are urged toward the power transmission surface by the urging member.
[Selection diagram] FIG.

Description

  The present technology relates to a power transmission device that sends power and a method of charging a vehicle.

  BACKGROUND ART Conventionally, a power transmission device for transmitting power to a vehicle has been proposed. The power transmission device is provided with a link mechanism that moves the power transmission device up and down. When the vehicle moves toward the power transmission device and a wheel of the vehicle pushes down a part of the link mechanism, the link mechanism raises the power transmission device by a force acting from the wheel. Since the power transmission device approaches the power reception device of the vehicle, the power supply efficiency can be increased (for example, see Patent Document 1).

JP-A-2015-154389

  A gap is provided between the raised power transmitting device and the power receiving device. Therefore, while charging the vehicle, there is a possibility that a foreign object such as a leaf and a metal product (for example, a clip or a coin) or a living body such as a dog or a cat may enter the gap.

  The present disclosure has been made in view of such circumstances, and has as its object to provide a power transmission device and a vehicle charging method capable of preventing a foreign object or a living body from entering the power transmission device.

  A power transmission device according to the present disclosure has a power transmission coil, a power transmission surface extending along a direction orthogonal to an axial direction of the power transmission coil, a case for housing the power transmission coil, and the case along the axial direction. An urging member for urging the power transmission surface side, wherein when the vehicle stops above the case, the case urged by the urging member contacts a power receiving unit of the vehicle.

  According to the present disclosure, when the vehicle stops above the case, the case contacts the power receiving unit of the vehicle by the urging member. Therefore, no space is provided between the case and the power receiving unit, and the invasion of foreign matter or a living body can be prevented.

  In the power transmission device according to the present disclosure, the power transmission coil is supported by the case, and the case and the power transmission coil are urged toward the power transmission surface by the urging member.

  In the present disclosure, the power transmission coil rises as the case rises. Regardless of the vehicle height, the distance between the power transmission coil and the power receiving unit can be easily maintained at a predetermined distance, and the power supply condition (coil resonance condition) at the predetermined distance between the coils can be easily reproduced, maintaining high power supply efficiency. It's easy to do.

  In the power transmission device according to the present disclosure, a removal unit that removes foreign matter from the power transmission surface is provided in the vehicle.

  In the present disclosure, since the removing unit is provided in the vehicle, the removing unit removes the foreign matter attached to the power transmission surface by moving the vehicle.

  In the power transmission device according to the present disclosure, the removing unit is provided in the power receiving unit.

  In the present disclosure, by providing the power receiving unit with the removing unit, the case can be brought into contact with the power receiving unit immediately after removing the foreign matter on the power transmission surface.

  The power transmission device according to the present disclosure is provided with a frame having a trapezoidal cross section having a guide hole for guiding the vertical movement of the case, and disposed next to the first inclined surface of the frame, and the wheels of the vehicle fit when stopped. A concave portion or a hole, wherein the wheel rides on the second inclined surface of the frame, moves on the top surface of the frame, descends the first inclined surface and fits in the concave portion or the hole, the power receiving portion. And the case come into contact with each other.

  In the present disclosure, when the wheel is fitted into the concave portion or the hole, the power receiving unit descends, approaches the case, and comes into contact with the case.

  In the power transmission device according to the present disclosure, an intrusion prevention member that can expand and contract vertically to prevent foreign matter from entering the inside of the case is provided below the case.

  In the present disclosure, by providing an intrusion prevention member that can expand and contract vertically, on the lower side of the case, for example, a space is generated between the raised case and the ground, and foreign matter or a living body enters the inside of the case. Can be prevented.

  A charging method according to an embodiment of the present disclosure provides a case where a power transmission coil is housed, and a case having a power transmission surface extending along a direction orthogonal to an axial direction of the power transmission coil is disposed such that the power transmission surface faces upward, and an urging member is provided. The case is urged upward, the vehicle is advanced, and a removing unit provided on the vehicle removes foreign matter from the power transmission surface, and the case urged by the urging member is used for the vehicle. Contact the power receiving part.

  In the present disclosure, after removing foreign matter from the power transmission surface, the case is brought into contact with the power receiving unit to prevent foreign matter or a living body from entering between the case and the power receiving unit.

  In the power transmission device and the charging method according to the present disclosure, when the vehicle stops above the case, the case contacts the power receiving unit of the vehicle by the urging member. Therefore, no space is provided between the case and the power receiving unit, and the invasion of foreign matter or a living body can be prevented. Further, the structure for preventing invasion of a foreign substance or a living body can be simplified, and improvement in reliability and reduction in manufacturing cost can be promoted.

1 is a schematic diagram illustrating a power transmission device, a lock device, and a vehicle according to a first embodiment. FIG. 3 is a plan view schematically showing a power transmission unit. FIG. 3 is a sectional view taken along line III-III of FIG. 2. It is an explanatory view explaining contact of a power transmission unit and a power receiving coil part. FIG. 9 is a cross-sectional view illustrating a power transmission unit according to Embodiment 2. FIG. 10 is a side view showing a power transmission unit and a power receiving coil unit according to Embodiment 3. FIG. 13 is a side view showing a power transmission unit and a power receiving coil unit according to Embodiment 4. FIG. 14 is a schematic diagram illustrating a power transmission unit, a power transmission control unit, a guide, a vehicle stop, and the like according to a fifth embodiment. It is an explanatory view explaining contact of a power transmission unit and a power receiving coil part.

(Embodiment 1)
Hereinafter, the present invention will be described with reference to the drawings showing the power transmitting device according to the first embodiment. FIG. 1 is a schematic diagram illustrating a power transmission device, a lock device, and a vehicle. The power transmission device includes a power transmission unit 1 and a power transmission control unit 10. The power transmission control unit 10 is installed on the ground. The power transmission control unit 10 includes, for example, a rectangular parallelepiped housing 11. The housing 11 contains, for example, a high-frequency power supply device and a control device (not shown).

  The power transmission unit 1 is connected to the power transmission control unit 10 via a wiring 9. The power transmission unit 1 is installed on the ground. The power transmission unit 1 includes a power transmission coil 3 (see FIGS. 2 and 3) described later. The power transmission control unit 10 supplies power to the power transmission coil 3. A current flows through the power transmission coil 3.

  The vehicle 20 has a power receiving coil unit 21, a power receiving unit 22, and a battery 23 mounted thereon. The power receiving coil unit 21 has a housing and a power receiving coil housed in the housing. The vertical direction of the receiving coil is the axial direction. The power receiving coil unit 21 is connected to the battery 23 via the power receiving unit 22. The power receiving coil unit 21 is disposed on the bottom surface of the vehicle 20, and the bottom surface of the power receiving coil unit 21 (hereinafter, referred to as a power receiving surface 21a) is exposed. When the vehicle 20 is stopped at a predetermined position, for example, when the vehicle 20 is stopped by being brought into contact with a vehicle stop (not shown), the power receiving coil unit 21 faces the power transmission unit 1. The power receiving unit 22 includes a rectifier circuit, a resonance capacitor, and the like. The power receiving coil is magnetically coupled to the power transmitting coil 3, non-contact power is supplied from the power transmitting coil 3 to the power receiving coil, and the battery 23 stores power. Note that an urging member may be provided between the housing of the power receiving coil unit 21 and the bottom surface of the vehicle 20 to urge the housing of the power receiving coil unit 21 downward.

  2 is a plan view schematically showing the power transmission unit 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. The power transmission unit 1 includes a case 2 that houses the power transmission coil 3. The case 2 has a truncated pyramid shape with an open bottom. The top surface of case 2 forms power transmission surface 2a. Case 2 is arranged with power transmission surface 2a facing upward. Since the side surface of the case 2 is inclined, even if the foreign matter reaches the side surface, the foreign matter moves downward due to the inclination and hardly remains. The case 2 may be formed in a truncated cone shape, or the side surface of the case 2 may be formed in a curved shape bulging outward.

  A plurality of receiving portions 2 b for receiving the urging member 5 are provided on a lower edge portion of the case 2. The urging member 5 is, for example, a pressing spring or rubber. The receiving portion 2b has a concave shape in which the bottom surface is arranged on the upper side. A plurality of second receiving portions 7 are arranged below the plurality of receiving portions 2b, respectively. The second receiving portion 7 is provided on the ground and has a concave portion 7a. The bottom surface of the receiving portion 2b and the bottom surface of the concave portion 7a are vertically opposed, and an urging member 5 is provided between the two bottom surfaces. The urging member 5 urges the case 2 upward.

  A support ring 8a is provided next to the second receiving portion 7. The support ring 8a has a rectangular shape, and the second receiving portion 7 is arranged inside the support ring 8a. The support ring 8a faces the lower edge of the case 2. The support ring 8a is provided on the ground, and between the support ring 8a and the case 2, a quadrangular bellows 8 which expands and contracts up and down is provided. The bellows 8 seals the space between the case 2 and the ground.

  The case 2 houses the power transmission coil 3. The power transmission coil 3 is arranged inside the second receiving portion 7 in the radial direction of the support ring 8a. The power transmission coil 3 and the support ring 8a are coaxially arranged. An installation plate 4 is fixed to the ground below the case 2. The power transmission coil 3 is installed on the installation plate 4. The power transmission coil 3 and the case 2 are coaxially arranged. The power transmission coil 3 is arranged near the ground so as to be substantially parallel to the ground. The plurality of biasing members 5 are arranged around the axis of the power transmission coil 3 at substantially the same phase interval.

  FIG. 4 is an explanatory diagram illustrating contact between the power transmission unit 1 and the power receiving coil unit 21. On the bottom surface of the vehicle 20, a removing unit for removing foreign matter, for example, a brush 24 is provided. When the vehicle 20 approaches the power transmission unit 1 and the traveling direction of the vehicle 20 is the front side, the brush 24 is disposed on the front side of the power receiving coil unit 21. An urging member may be provided between the brush 24 and the bottom surface of the vehicle 20 to urge the brush 24 downward.

  The case 2 is urged upward by the urging force of the urging member 5, and when no downward force acts on the case 2, the power transmission surface 2 a of the case 2 is higher than the power reception surface 21 a of the power reception coil unit 21. Placed in An urging member may be provided between the brush 24 and the bottom surface of the vehicle 20 to urge the brush 24 downward.

  When the vehicle 20 approaches the power transmission unit 1 and the traveling direction of the vehicle 20 is set to the front side, the wheels 20 a of the vehicle 20 are disposed on the right side or the left side of the power transmission unit 1 and do not contact the power transmission unit 1. As shown by the white arrow in FIG. 4A, when the vehicle 20 approaches the power transmission unit 1, the brush 24 contacts the upper surface of the case 2 (see FIG. 4A) and moves while contacting the power transmission surface 2a (see FIG. 4A). See FIG. 4B). Since the brush 24 moves in contact with the upper surface of the case 2, foreign matters such as leaves or metal products (for example, clips or coins) attached to the upper surface of the case 2 are removed. As shown by the arrow in FIG. 4B, the case 2 moves downward by the contact of the brush 24.

  As shown by an arrow in FIG. 4C, when the brush 24 passes above the case 2, the case 2 rises, and the power transmission surface 2a is disposed above the power reception surface 21a. When the vehicle 20 further advances, the case 2 comes into contact with the power receiving coil unit 21 and descends slightly, so that the power transmitting surface 2a and the power receiving surface 21a come into contact. As shown in FIG. 4D, when the vehicle 20 stops at a predetermined position, the power transmission surface 2a and the power reception surface 21a face and contact with each other. No space is provided between the power transmission surface 2a and the power reception surface 21a. Power transmission is started from the power transmission surface 2a to the power reception surface 21a.

  In the power transmission device and the charging method according to the first embodiment, when vehicle 20 stops above case 2, case 2 contacts power reception coil unit 21 of vehicle 20 by biasing member 5. For this reason, no space is provided between the case 2 and the power receiving coil unit 21, and it is possible to prevent foreign matter or a living body from entering. Further, the structure for preventing invasion of a foreign substance or a living body can be simplified, and improvement in reliability and reduction in manufacturing cost can be promoted.

  Further, since the vehicle 20 is provided with the brush 24, the brush 24 can remove foreign matter attached to the power transmission surface 2a by the movement of the vehicle 20.

  In addition, by supporting the case 2 with the plurality of urging members 5, the case 2 is more stably supported as compared with the case where one urging member 5 is used. In addition, by providing the bellows 8 that can expand and contract vertically on the lower side of the case 2, for example, a space is generated between the raised case 2 and the ground, and foreign matter or a living body is prevented from entering the inside of the case 2. be able to.

(Embodiment 2)
Hereinafter, the present invention will be described with reference to the drawings showing a power transmission device according to a second embodiment. FIG. 5 is a sectional view showing the power transmission unit 1. Among the configurations according to the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  A support plate 4 a is fixed inside the case 2. The support plate 4a is substantially parallel to the power transmission surface 2a, and the peripheral edge of the support plate 4a is fixed to the inner peripheral surface of the case 2. The power transmission coil 3 is provided on the upper surface of the support plate 4a.

  In the power transmission device according to the second embodiment, power transmission coil 3 also moves up as case 2 rises. Therefore, regardless of the vehicle height, the distance between the power transmission coil 3 and the power reception coil unit 21 can be easily maintained at a predetermined distance, and the power supply condition (coil resonance condition) at the predetermined distance between the coils can be easily reproduced. It is easy to maintain high power supply efficiency.

(Embodiment 3)
Hereinafter, the present invention will be described with reference to the drawings showing a power transmission device according to Embodiment 3. Among the configurations according to the third embodiment, the same components as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 6 is a side view showing the power transmission unit 1 and the power receiving coil unit 21. The brush 24 is provided on the power receiving surface 21 a of the power receiving coil unit 21. When the traveling direction of the vehicle 20 is the front side, the brush 24 is provided at the front end of the power receiving surface 21a.

  In the power transmitting device according to the third embodiment, by providing brush 24 on power receiving coil portion 21, case 2 can be brought into contact with power receiving coil portion 21 immediately after foreign substances on power transmitting surface 2 a are removed. After the removal of the foreign matter is completed, the case 2 can be brought into contact with the power receiving coil portion 21 immediately, so that the time during which the foreign matter or the living body can enter can be reduced.

(Embodiment 4)
Hereinafter, the present invention will be described with reference to the drawings showing a power transmission device according to Embodiment 4. In the configuration according to the fourth embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 7 is a side view illustrating the power transmission unit 1 and the power receiving coil unit 21.

  The power receiving coil unit 21 includes a removing unit 24a that removes foreign matter. The removing unit 24a forms a part of a housing of the power receiving coil unit 21, for example. When the traveling direction of the vehicle 20 is the front side, the removing portion 24a is formed integrally with the front end of the housing.

  In the power transmitting device according to the fourth embodiment, by removing unit 24a integrally formed with power receiving coil portion 21, case 2 is brought into contact with power receiving coil portion 21 immediately after foreign matter on power transmitting surface 2a is removed. Can be. After the removal of the foreign matter is completed, the case 2 can be brought into contact with the power receiving coil portion 21 immediately, so that the time during which the foreign matter or the living body can enter can be reduced. Further, since the power receiving coil unit 21 is formed integrally with the power receiving coil unit 21, there is no need to separately provide the removing unit 24a in the vehicle 20, and the number of components can be reduced.

(Embodiment 5)
Hereinafter, the present invention will be described with reference to the drawings showing a power transmitting device according to a fifth embodiment. In the configuration according to the fifth embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 8 is a schematic diagram illustrating the power transmission unit 1, the power transmission control unit 10, the guide 12, the vehicle stop 30, and the like.

  Two guides 12 for guiding the vehicle 20 project from the one side surface 11a of the housing 11 in the same direction. The two guides 12 have a band shape and extend along the ground surface. The two guides 12 are arranged substantially at right angles to the ground surface, and face each other at an interval. The protruding ends of the two guides 12 are bent outward so that the distance between them gradually increases. A horizontally long frame 13 is provided between the two guides 12. The cross-sectional shape of the frame 13 in a cross section perpendicular to the longitudinal direction is trapezoidal, and the frame 13 has a flat horizontally long top surface 13d and a first inclined surface that is inclined downward from each of two long edges of the top surface 13d. 13b and a second inclined surface 13c. A guide hole 13 a penetrating vertically is formed in the center of the frame 13 in the longitudinal direction. The power transmission unit 1 is installed in the guide hole 13a. The inner surface of the guide hole 13a forms a guide surface for guiding the case 2 up and down.

  Between the first inclined surface 13b and the power transmission control unit 10 and between the two guides 12, for example, a horizontally long wheel stop 30 is disposed. The wheel stop 30 is provided integrally on one side surface 11 a of the housing 11. A recess or hole 17 for fitting the wheel 20 a of the vehicle 20 is formed between the vehicle stop 30 and the power transmission unit 1. The recess or hole 17 is adjacent to the first inclined surface 13b.

  FIG. 9 is an explanatory diagram illustrating contact between the power transmission unit 1 and the power receiving coil unit 21. 9A, when the vehicle 20 moves toward the power transmission unit 1, the wheels 20a ride on the second inclined surface 13c of the frame 13, the brush 24 comes into contact with the case 2, and the power is transmitted. Foreign matter adhering to the surface 2a is removed. The wheel 20a moves on the top surface 13d of the frame 13. At this time, the case 2 of the power transmission unit 1 is arranged at the raised position by the urging force of the urging member 5. When the traveling direction of the vehicle 20 is set to the front side, the power receiving coil unit 21 is arranged rearward of the power transmission unit 1.

  As shown by the white arrow in FIG. 9B, when the vehicle 20 further advances, the wheel 20a goes down the first inclined surface 13b and fits into the recess or hole 17, and the vehicle 20 descends, the power receiving coil unit Reference numeral 21 is disposed substantially directly above the power transmitting unit 1, and the power receiving surface 21 a of the power receiving coil unit 21 descends and contacts the power transmitting surface 2 a of the case 2. The case 2 is pushed down by the power receiving coil unit 21. The upward urging force of the urging member 5 acts on the case 2, and the power transmission surface 2a is pressed against the power reception surface 21a. Power transmission is started from the power transmission surface 2a to the power reception surface 21a.

  In the power transmitting device according to the fifth embodiment, when wheel 20a fits into recess or hole 17, power receiving coil portion 21 descends, approaches case 2, and contacts power transmitting surface 2a. Therefore, a foreign substance or a living body is prevented from entering between the case 2 and the power receiving coil unit 21.

  In the above-described embodiment, the brush 24 is described as an example of the removing unit, but a blade made of a synthetic resin member may be used as the removing unit instead of the brush 24. Further, the bellows 8 is an example of an intrusion prevention member that can expand and contract vertically. Instead of the bellows 8, a tubular portion made of a flexible synthetic resin member may be used.

  The embodiment disclosed this time is an example in all respects, and should be considered as not being restrictive. The technical features described in the embodiments can be combined with each other, and the scope of the present invention is intended to include all the modifications within the scope of the claims and the scope equivalent to the scope of the claims. Is done.

Reference Signs List 1 power transmission unit 2 case 2a power transmission surface 3 power transmission coil 5 biasing member 8 bellows (intrusion prevention member)
10 power transmission control unit 17 recess or hole 21 power receiving coil unit (power receiving unit)
24 brush (removal part)

Claims (7)

A power transmission coil,
A case having a power transmission surface extending along a direction orthogonal to the axial direction of the power transmission coil, and housing the power transmission coil,
An urging member for urging the case toward the power transmission surface along the axial direction,
When the vehicle stops above the case, the case urged by the urging member contacts the power receiving unit of the vehicle. The power transmission coil is supported by the case,
The power transmission device according to claim 1, wherein the case and the power transmission coil are urged toward the power transmission surface by the urging member. The power transmission device according to claim 1, wherein a removal unit that removes foreign matter from the power transmission surface is provided in the vehicle. The power transmission device according to claim 3, wherein the power receiving unit includes the removal unit. A frame with a trapezoidal cross section having a guide hole for guiding the vertical movement of the case,
A concave portion or a hole, which is arranged next to the first inclined surface of the frame, and into which a wheel of the vehicle fits when stopped.
When the wheel rides on the second inclined surface of the frame, moves on the top surface of the frame, descends on the first inclined surface and fits in a recess or a hole, the power receiving unit and the case come into contact with each other. Item 5. The power transmission device according to any one of Items 1 to 4. The power transmission device according to any one of claims 1 to 5, wherein an intrusion prevention member that can expand and contract vertically to prevent foreign matter from entering the inside of the case is provided below the case. Housing the power transmission coil, a case having a power transmission surface extending along a direction orthogonal to the axial direction of the power transmission coil, arranged so that the power transmission surface faces upward,
The case is biased upward by a biasing member,
Advance the vehicle, by the removal unit provided in the vehicle, to remove foreign matter from the power transmission surface,
A method of charging a vehicle, wherein the case urged by the urging member is brought into contact with a power receiving unit of the vehicle.

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