KR102269528B1 - Charging Apparatus for Micro Electric Vehicle - Google Patents

Abstract

The present invention provides a cradle on which a miniature electric vehicle is mounted; a wireless charging unit coupled to the cradle and configured to perform wireless charging on the miniature electric vehicle mounted on the cradle; and a accommodating part accommodating the first wheel of the miniature electric vehicle mounted on the cradle, wherein the wireless charging unit includes a wireless power transmission coil for transmitting power to the wireless power receiving coil of the miniature electric vehicle, and the accommodating part A first rotation mechanism that rotates according to being pressed by the first wheel accommodated, a second rotation mechanism connected to the first rotation mechanism to rotate together as the first rotation mechanism rotates, and a second rotation mechanism to rotate together with the second rotation mechanism It relates to a charging device for a miniature electric vehicle coupled to the second rotating mechanism and comprising a transmission mechanism to which the wireless power transmission coil is coupled.

Description

Charging Apparatus for Micro Electric Vehicle

The present invention relates to a charging device for a miniature electric vehicle for charging a miniature electric vehicle running using electricity.

Micro electric vehicles, electric two-wheeled vehicles, electric bicycles, personal mobility, etc. (hereinafter referred to as 'micro electric vehicles') operate using batteries and motors, so the batteries must be charged after driving for a certain period of time. . A typical micro electric vehicle charges the battery by inserting the electric plug of the charging adapter into the commercial power source and receiving electric energy supplied from the commercial power source.

Recently, research and development of a wireless charging method that can be charged without plugging in a plug as an alternative to a wired charging method is being actively conducted. The wireless charging method is a method of charging the battery of a miniature electric vehicle using magnetic induction or magnetic resonance between a wireless power transmission coil installed in a charging device and a wireless power receiving coil installed in a miniature electric vehicle.

The wireless charging method is simpler and more convenient than the wired charging method because the charging operation starts when the micro electric vehicle is placed in the charging position. However, until the wireless charging method is fully applied, the wired charging type micro electric vehicle and the wireless charging type micro electric vehicle will be mixed, so the charging infrastructure for wired charging and the charging infrastructure for wireless charging are required respectively. There is this.

In addition, in general, in the wireless charging method, when the wireless power transmitting coil and the wireless power receiving coil are misaligned, such as misaligned or disposed at a large distance, the charging efficiency and charging speed are lowered, so the wireless power transmitting coil and the wireless power receiving coil The alignment of the liver is an important factor to obtain sufficient charging efficiency and sufficient charging speed.

However, since the miniature electric vehicle is formed in various sizes according to the type, displacement, design element, etc., the charging device according to the prior art arranges the wireless power transmission coil and the wireless power receiving coil to such a degree that sufficient charging efficiency and sufficient charging speed are obtained. There is a problem that it is difficult to mount a micro electric vehicle as much as possible.

The present invention has been devised to solve the above-described problem, and solves the difficulty of mounting the micro electric vehicle so that the wireless power transmission coil and the wireless power receiving coil are aligned to the extent that sufficient charging efficiency and sufficient charging speed can be obtained. It is to provide a charging device for an ultra-small electric vehicle that can do this.

In order to solve the above problems, the present invention may include the following configuration.

A charging device for a miniature electric vehicle according to the present invention includes: a cradle on which the miniature electric vehicle is mounted; a wireless charging unit coupled to the cradle and configured to perform wireless charging on the miniature electric vehicle mounted on the cradle; and a accommodating part for accommodating the first wheel of the miniature electric vehicle mounted on the cradle. The wireless charging unit includes a wireless power transmission coil for transmitting power to the wireless power receiving coil of the micro electric vehicle, a first rotating mechanism that rotates according to being pressed by the first wheel accommodated in the receiving unit, and the first rotating mechanism. A second rotation mechanism connected to the first rotation mechanism to rotate together as it rotates, and a transmission mechanism coupled to the second rotation mechanism to rotate with the second rotation mechanism and the wireless power transmission coil is coupled. have.

In the charging device for a miniature electric vehicle according to the present invention, the second rotating mechanism rotates together as the first rotating mechanism is rotated by being pressed by the first wheel, and the transmitting mechanism receives the wireless power receiving coil coupled thereto. The transmission mechanism may be raised to contact the mechanism. The transmission mechanism includes a first charging groove formed to have a first length based on a width direction perpendicular to a running direction in which the micro electric vehicle travels, and a shorter length than the first length based on the width direction. It may include a second charging groove formed to have a second length. The second charging groove may be disposed at a position in which a distance spaced apart from the wireless power transmission coil is shorter than that of the first charging groove based on an insertion direction in which the receiver device is inserted. The receiver device may be selectively inserted into the second charging groove according to the length of the receiver device with respect to the width direction.

In the charging device for a miniature electric vehicle according to the present invention, the accommodating part includes a first accommodating groove formed to have a first width with respect to a width direction perpendicular to a traveling direction in which the miniature electric vehicle travels, and the width direction. It may include a second accommodating groove formed to have a second width shorter than the first width based on the . The second accommodating groove may be disposed at a position deeper than that of the first accommodating groove based on a receiving direction in which the first wheel is inserted. The first wheel may be selectively accommodated in the second accommodating groove according to a width of the first wheel with respect to the width direction. The first rotation mechanism may be arranged to rotate at a larger rotation angle when the first wheel is accommodated in the second accommodation groove than when the first wheel is accommodated in the first accommodation groove. The second rotation mechanism raises the transmission mechanism so that the transmission mechanism comes into contact with the receiver mechanism to which the wireless power receiving coil is coupled while the first rotation mechanism rotates as the first rotation mechanism is pressed by the first wheel and rotates. It may be connected to the first rotation mechanism so that a distance for raising the transmission mechanism increases as the rotation angle at which the first rotation mechanism is rotated increases.

According to the present invention, the following effects can be achieved.

The present invention is implemented to reduce the separation distance between the wireless power transmission coil and the wireless power receiving coil by using the weight of the miniature electric vehicle in the process of moving the miniature electric vehicle for mounting. Therefore, in the present invention, since the alignment between the wireless power transmission coil and the wireless power reception coil is made in the process of moving the micro electric vehicle for mounting, the ease of aligning the wireless power transmission coil and the wireless power reception coil can be improved. can

The present invention is implemented to align the wireless power transmission coil and the wireless power receiving coil for various micro electric vehicles, thereby improving the versatility of performing wireless charging with sufficient charging efficiency and sufficient charging speed for various micro electric vehicles. can do it

1 is a schematic block diagram of a charging device for an ultra-small electric vehicle according to the present invention;
2 is a schematic perspective view of a charging device for a miniature electric vehicle according to the present invention;
3 is a conceptual side view of a charging device for an ultra-small electric vehicle according to the present invention;
4 is a schematic enlarged view showing an enlarged portion A of FIG. 3
5 to 9 are schematic front cross-sectional views of the transmission mechanism taken along line II of FIG.
10 is a schematic side view of a second rotating mechanism, a transmission mechanism, and a flexible mechanism in the charging device for an ultra-small electric vehicle according to the present invention;
11 to 14 are schematic front cross-sectional views of a receiving part in the charging device for an ultra-small electric vehicle according to the present invention;
16 is a schematic plan view of a charging device for a miniature electric vehicle according to the present invention;
17 is a schematic side view showing a part of a cradle in the charging device for an ultra-small electric vehicle according to the present invention;

Hereinafter, an embodiment of a charging device for a miniature electric vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the charging device 1 for a miniature electric vehicle according to the present invention is a miniature electric vehicle (100) operating using a battery and a motor, such as a miniature electric vehicle, an electric two-wheeled vehicle, an electric bicycle, and personal mobility. ) is used to charge

Before describing the charging device 1 for a miniature electric vehicle according to the present invention, the miniature electric vehicle 100 will be described as follows.

The miniature electric vehicle 100 is driven using electricity. The micro electric vehicle 100 includes a main body 110 for a driver to ride, a first wheel 120 rotatably coupled to the body 110 , and a second rotatably coupled body 110 . It may include a wheel 130 . As the first wheel 120 and the second wheel 130 rotate, the main body 110 may travel in a traveling direction. In FIG. 2 , the first wheel 120 corresponds to the front wheel and the second wheel 130 corresponds to the rear wheel, but the present invention is not limited thereto, and the first wheel 120 corresponds to the rear wheel. The second wheel 130 may correspond to the front wheel. When the first wheel 120 corresponds to the rear wheel and the second wheel 130 corresponds to the front wheel, the micro electric vehicle 100 may be mounted in a direction opposite to that shown in FIG. 2 . Hereinafter, description will be made on the basis that the first wheel 120 corresponds to the front wheel and the second wheel 130 corresponds to the rear wheel. From this, the application of the case where the first wheel 120 corresponds to the rear wheel and the second wheel 130 corresponds to the front wheel will be apparent to those skilled in the art to which the present invention belongs.

The miniature electric vehicle 100 may include a battery 140 , a wireless charging and receiving coil 150 , and a receiver unit 160 .

The battery 140 stores electricity. The electricity stored in the battery 140 may be used to drive the micro electric vehicle 100 .

The wireless charging receiving coil 150 is used for wireless charging. When the charging device 1 for a miniature electric vehicle according to the present invention transmits power to the wireless charging receiving coil 150, the wireless charging receiving coil 150 can charge the battery 140 with the received power. have.

The receiver unit 160 protects the wireless charging and receiving coil 150 . The wireless charging receiving coil 150 may be coupled to the receiver unit 160 so as to be located inside the receiver unit 160 . The receiver unit 160 may be coupled to the main body 110 . The receiver unit 160 may be coupled to the lower portion of the main body 110 , but is not limited thereto, and may be coupled to a position other than the lower portion of the main body 110 . The receiver unit 160 may correspond to a part of the main body 110 .

In order to charge the miniature electric vehicle 100, the charging device 1 for a miniature electric vehicle according to the present invention includes a cradle 2 on which the miniature electric vehicle 100 is mounted, and the miniature electric vehicle 100. It may include a wireless charging unit 3 for performing wireless charging, and an accommodating unit 4 for accommodating the first wheel 120 of the micro electric vehicle 100 mounted on the mounting unit 2 .

Referring to FIGS. 1 and 2 , the cradle 2 is for the miniature electric vehicle 100 to be mounted. In a state where the miniature electric vehicle 100 is mounted on the cradle 2 , wireless charging of the miniature electric vehicle 100 may be performed. The micro electric vehicle 100 may be mounted on the mounting unit 2 by moving in the entry direction from a position spaced apart from the mounting unit 2 . In this case, the micro electric vehicle 100 may be moved in the entry direction by the driver. The entirety of the micro electric vehicle 100 may be mounted on the mounting unit 2 in a state in which it is disposed on the upper side of the mounting unit 2 . Although not shown, a part of the micro electric vehicle 100 may be mounted on the holder 2 in a state where it is disposed on the upper side of the holder 2 .

1 to 4 , the wireless charging unit 3 performs wireless charging for the miniature electric vehicle 100 mounted on the mounting unit 2 . The wireless charging unit 3 may be coupled to the mounting unit 2 . The wireless charging unit 3 may include a wireless power transmission coil 31 , a first rotation mechanism 32 , a second rotation mechanism 33 , and a transmission mechanism 34 .

The wireless power transmission coil 31 transmits power to the wireless power reception coil 150 . The wireless power transmission coil 31 is electrically connected to a power source (not shown), and may transmit electricity supplied from the power source to the wireless power reception coil 150 . The wireless power transmission coil 31 may be coupled to the transmission mechanism 34 .

The first rotating mechanism 32 is rotatably coupled to the mounting portion 2 . In the process in which the micro electric vehicle 100 is moved in the entry direction and the first wheel 120 is accommodated in the accommodating part 4 , the first rotating mechanism 32 is the first wheel 120 . It can rotate when pressed. The first rotation mechanism 32 may rotate about a rotation shaft 32a. A step plate 321 may be coupled to the first rotation mechanism 32 . In the process in which the first wheel 120 is accommodated in the accommodating part 4 , the step plate 321 is in direct contact with the first wheel 120 , thereby being pressed against the first wheel 120 . . As the step plate 321 is pressed by the first wheel 120 , the first rotation mechanism 32 may rotate about the rotation shaft 32a. The first rotation mechanism 32 may be disposed inside the mounting part 2 .

The second rotation mechanism 33 is rotatably coupled to the mounting portion 2 . The second rotation mechanism 33 may be connected to the first rotation mechanism 32 so as to rotate together as the first rotation mechanism 32 rotates. The second rotation mechanism 33 and the first rotation mechanism 32 may rotate about the rotation shaft 32a, respectively. In this case, the second rotation mechanism 33 and the first rotation mechanism 32 are coupled to a shaft implementing the rotation shaft 32a, so that they can be connected to rotate together around the rotation shaft 32a. have. The second rotation mechanism 33 and the first rotation mechanism 32 may be arranged to extend in opposite directions with respect to the rotation shaft 32a. The second rotation mechanism 33 may be disposed inside the mounting portion 2 .

The transmission mechanism 34 protects the wireless power transmission coil 31 . The wireless power transmission coil 31 may be coupled to the transmission mechanism 34 so as to be located inside the transmission mechanism 34 . The transmission mechanism 34 may be coupled to the second rotation mechanism 33 . In this case, one side of the second rotation mechanism 33 may be coupled to a shaft implementing the rotation shaft 32 . The transmission mechanism 34 may be coupled to the other side of the second rotation mechanism 33 . Accordingly, when the first rotation mechanism 32 rotates as the first wheel 120 accommodated in the accommodating part 4 presses the first rotation mechanism 32, the second rotation mechanism 33 may raise the transmission mechanism 34 while rotating together as the first rotation mechanism 32 rotates. As shown in FIG. 4 , the transmission mechanism 34 raised by the second rotation mechanism 33 protrudes to the outside of the mounting part 2 to receive the receiver mechanism 160 of the micro electric vehicle 100 . can be in contact with In this case, when referring to FIG. 4 , the transmission mechanism 34 , the second rotation mechanism 33 , and the first rotation mechanism 32 rotate in a counterclockwise direction about the rotation shaft 32a. can rotate Thereafter, the wireless power transmission coil 31 transmits power to the wireless power reception coil 150 , so that wireless charging of the miniature electric vehicle 100 may be performed.

In this way, the charging device 1 for a miniature electric vehicle according to the present invention transmits the transmission using the weight of the miniature electric vehicle 100 while the miniature electric vehicle 100 is mounted on the mounting unit 2 . By elevating the mechanism 34 , it may be implemented to reduce the separation distance between the wireless power transmission coil 31 and the wireless power reception coil 150 . Accordingly, in the charging device 1 for a miniature electric vehicle according to the present invention, the wireless power transmission coil 31 and the wireless power receiving coil ( Since the alignment between 150) is made, the easiness of the operation of aligning the wireless power transmission coil 31 and the wireless power reception coil 150 can be improved.

On the other hand, when the micro electric vehicle 100 is detached from the cradle 2 , the first rotation mechanism 32 is rotated as the first wheel 120 moves so as to be separated from the accommodating part 4 . The pressing force is reduced. Accordingly, the first rotation mechanism 32 may lower the transmission mechanism 34 by rotating the second rotation mechanism 33 while rotating about the rotation shaft 32a. In this case, when referring to FIG. 3 , the transmission mechanism 34 , the second rotation mechanism 33 , and the first rotation mechanism 32 rotate clockwise about the rotation shaft 32a. can do. As the transmission mechanism 34 descends, as shown in FIG. 3 , the second rotation mechanism 33 and the transmission mechanism 34 are disposed inside the mounting part 2 , so that the micro electric vehicle (100) may be disposed at a position that does not interfere with separation from the mounting portion (2). In addition, even before the micro electric vehicle 100 is mounted on the cradle 2 , the second rotation mechanism 33 and the transmission mechanism 34 are disposed inside the cradle 2 , so that the It may be disposed at a position that does not interfere with mounting the miniature electric vehicle 100 on the mounting unit 2 . Therefore, the charging device 1 for a miniature electric vehicle according to the present invention can improve the easiness of aligning the wireless power transmission coil 31 and the wireless power receiving coil 150, while the miniature electric vehicle It can be implemented so that the mounting operation of mounting the 100 to the cradle 2 and the detachment operation of disengaging the micro electric vehicle 100 from the cradle 2 can be smoothly performed. In order for the second rotation mechanism 33 and the transmission mechanism 34 to move between the inside of the mounting part 2 and the outside of the mounting part 2, the mounting part 2 has a through hole 20, 4) may be formed. The through hole 20 may be formed to pass through the upper surface of the mounting part 2 .

Although not shown, the wireless charging unit 3 may include an elastic mechanism. When the first rotation mechanism 32 is not pressed by the first wheel 120 , the elastic mechanism is configured such that the second rotation mechanism 33 and the transmission mechanism 34 are located inside the holder 2 . At least one of the first rotation mechanism 32 and the second rotation mechanism 33 may be elastically pulled to be located in the . In this case, when the first rotation mechanism 32 and the second rotation mechanism 33 rotate as the first rotation mechanism 32 is pressed by the first wheel 120 , the elastic mechanism is tensioned and can have resilience. After that, if the first rotation mechanism 32 is not pressed by the first wheel 120 , the elastic mechanism uses a restoring force between the first rotation mechanism 32 and the second rotation mechanism 33 . By pulling at least one, the first rotation mechanism 32 and the second rotation mechanism 33 can be rotated about the rotation shaft 32a. Accordingly, the second rotation mechanism 33 and the transmission mechanism 34 may be located inside the mounting portion (2). The elastic mechanism may be a spring (Spring).

1 to 4 , the accommodating part 4 is for accommodating the first wheel 120 . The receiving part 4 may be coupled to the mounting part 2 . Based on the entry direction, the accommodating part 4 may be disposed on the front side with respect to the mounting part 2 . The accommodating part 4 and the mounting part 2 may be implemented integrally.

The accommodating part 4 may include a first accommodating groove 41 . The first wheel 120 may be accommodated in the accommodating part 4 by being inserted into the first accommodating groove 41 . The first accommodating groove 41 may be formed to open the upper surface of the accommodating part 4 . Accordingly, the first wheel 120 may be inserted into the accommodating part 4 through the first accommodating groove 41 , and may be separated from the accommodating part 4 .

The first rotating mechanism 32 may be disposed inside the receiving part 4 . The first rotating mechanism 32 may be rotatably disposed within the first receiving groove 41 . Accordingly, while the first wheel 120 is inserted into the first receiving groove 41 , the first rotating mechanism 32 rotates the rotating shaft 32a as the first wheel 120 is pressed. can be rotated around the center. Based on the entry direction, the first rotation mechanism 32 may be disposed on the front side with respect to the second rotation mechanism 33 .

Here, since the miniature electric vehicle 100 may be implemented in various sizes depending on the type, displacement, design factors, etc., the receiver unit 160 may also be formed in various sizes. In this case, the charging device 1 for an ultra-small electric vehicle according to the present invention includes the wireless power transmission coil 31 and the wireless power transmission coil 31 to the extent that sufficient charging efficiency and sufficient charging speed can be obtained for the receiver units 160 formed in various sizes. It may be implemented to align the wireless power receiving coil 150 . Looking at this in detail, it is as follows.

1 to 10 , the transmission mechanism 34 may include a first charging groove 341 and a second charging groove 342 .

The first charging groove 341 is formed in the transmission mechanism 34 . The first charging groove 341 may be a groove formed to a predetermined depth on one surface of the transmission mechanism 34 . One surface of the transmission mechanism 34 is a surface facing the receiver mechanism 160 of the miniature electric vehicle 100 mounted on the cradle 2 . The first charging groove 341 may be formed to open one surface of the transmission mechanism 34 . Accordingly, when the transmission mechanism 34 rises as the first rotation mechanism 31 is pressed by the first wheel 120 , the receiver mechanism 160 is inserted into the first charging groove 341 . can be The first charging groove 341 may be formed to have a first length 341L (shown in FIG. 5 ) based on the width direction (WD axis direction). The width direction (WD axis direction) may be an axial direction perpendicular to a driving direction (DD axis direction, shown in FIG. 3 ) in which the micro electric vehicle 100 travels.

The second charging groove 342 is formed in the transmission mechanism 34 . The second charging groove 342 may be a groove formed to a predetermined depth on one surface of the transmission mechanism 34 . The second charging groove 342 may be formed to be connected to the first charging groove 341 . Accordingly, the second charging groove 342 and the first charging groove 341 may be formed to open one surface of the transmission mechanism 34 . In this case, the transmission mechanism 34 may be formed as a whole in the shape of a digit. Based on the direction in which the transmission mechanism 34 rises as the first rotation mechanism 31 is pressed by the first wheel 120 , the first charging groove 341 is the second charging groove ( 342) may be disposed on the upper side. The second charging groove 342 may be formed to have a second length 342L (shown in FIG. 5 ) based on the width direction (WD axis direction). The second length 342L may be shorter than the first length 341L. Therefore, based on the width direction (WD axis direction), the second charging groove 342 may be formed to have a shorter length than that of the first charging groove 341 .

The receiver unit 160 is selectively inserted into the second charging groove 342 according to the length (160L, shown in FIG. 5) of the receiver unit 160 with respect to the width direction (WD axis direction). can be 5 and 6, the length 160L of the receiver unit 160 is equal to or less than the first length 341L and the second length 342L with respect to the width direction (the WD arrow direction). If it exceeds, the receiver unit 160 may not be inserted into the second charging groove 342 and may be inserted only into the first charging groove 341 . As shown in FIGS. 5 and 7 , when the length 160L of the receiver unit 160 is equal to or less than the second length 342L with respect to the width direction (the direction of the WD arrow), the receiver unit 160 may be inserted into both the first charging groove 341 and the second charging groove 342 .

On the other hand, based on the insertion direction in which the receiver mechanism 160 is inserted into the transmission mechanism 34, the second charging groove 342 is the first charging groove 341 compared to the wireless power transmission coil ( 31) may be arranged at a shorter distance away from each other. Accordingly, the wireless power transmission when the receiver unit 160 is inserted into both the first charging groove 341 and the second charging groove 342 compared to the case where only the first charging groove 341 is inserted. The separation distance between the coil 31 and the wireless power receiving coil 150 may be implemented to be shorter. Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention is capable of obtaining sufficient charging efficiency and sufficient charging speed for the receiving mechanism 160 formed in various sizes. The power receiving coil 150 may be aligned. Since the size of the wireless power receiving coil 150 becomes smaller as the size of the receiver unit 160 is smaller, the distance between the wireless power receiving coil 150 and the wireless power transmitting coil 31 must be reduced to ensure sufficient charging. This is because efficiency and sufficient charging speed can be obtained.

The transmission mechanism 34 may include a first support member 343 and a second support member 344 .

The first support member 343 supports the receiver unit 160 inserted into the first charging groove 341 . When the length 160L of the receiver unit 160 is less than or equal to the first length 341L and greater than the second length 342L based on the width direction (the direction of the WD arrow), the receiver unit 160 may not be inserted into the second charging groove 342 , but only inserted into the first charging groove 341 to be supported by the first support member 343 .

The first support member 343 may include a first support surface 3431 and a first limiting surface 3432 .

The first support surface 3431 supports the opposite surface 160a (shown in FIG. 5 ) of the receiver unit 160 inserted into the first charging groove 341 . The opposing surface 160a is a surface of the receiver unit 160 facing toward the transmission mechanism 34 . When the length 160L of the receiver unit 160 is less than or equal to the first length 341L and greater than the second length 342L based on the width direction (WD arrow direction), the first support surface ( 3431 may limit the degree to which the receiver unit 160 is inserted into the transmission unit 34 by supporting the opposing surface 160a. Accordingly, the distance at which the transmission mechanism 34 rises may be limited.

The first limiting surface 3432 is disposed on both sides of the first charging groove 341 based on the width direction (WD axis direction). Accordingly, the first limiting surface 3432 may limit the movable distance of the receiver unit 160 inserted into the first charging groove 341 in the width direction (WD axis direction). Accordingly, in the charging device 1 for a miniature electric vehicle according to the present invention, while wireless charging is performed with the receiver unit 160 inserted in the first charging groove 341, the width direction (WD arrow direction) It is possible to reduce the degree of misalignment between the wireless power transmitting coil 31 and the wireless power receiving coil 150 due to vibration, shaking, etc. occurring based on the . Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention can improve the stability of wireless charging for the miniature electric vehicle 100 .

The second support member 344 supports the receiver unit 160 inserted into the second charging groove 342 . When the length 160L of the receiver unit 160 is less than or equal to the second length 342L based on the width direction (the direction of the WD arrow), the receiver unit 160 is disposed in the second charging groove 342 . It may be inserted and supported by the second support member 344 .

The second support member 344 may include a second support surface 3441 and a second limiting surface 3442 .

The second support surface 3441 supports the opposite surface 160a of the receiver unit 160 inserted into the second charging groove 342 . When the length 160L of the receiver unit 160 is equal to or less than the second length 342L with respect to the width direction (the direction of the WD arrow), the second support surface 3441 is the opposite surface 160a. By supporting it, it is possible to limit the degree to which the receiver unit 160 is inserted into the transmission unit 34 . Accordingly, the distance at which the transmission mechanism 34 rises may be limited.

The second limiting surface 3442 is disposed on both sides of the second charging groove 342 in the width direction (WD axis direction). Accordingly, the second limiting surface 3442 may limit the movable distance of the receiver unit 160 inserted into the second charging groove 342 in the width direction (WD axis direction). Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention relates to wireless charging of the miniature electric vehicle 100 performed in a state in which the receiver unit 160 is inserted into the second charging groove 342 . Stability can be improved.

Referring to FIG. 7 , the second limiting surface 3442 and the first supporting surface 3431 may be formed to be connected to each other. In this case, the included angle 343a between the second limiting surface 3442 and the first supporting surface 3431 may be implemented to form a right angle. In this case, the transmission mechanism 34 may be implemented in a stepped structure.

Referring to FIG. 8 , the included angle 343a between the second limiting surface 3442 and the first supporting surface 3431 may be implemented to form an obtuse angle. That is, the included angle 343a may be implemented to be greater than 90 degrees and smaller than 180 degrees. In this case, the first limiting surface 3432 may be inclined so that the size of the first charging groove 341 decreases as it extends in the insertion direction. The second limiting surface 3442 may be inclined so that the size of the second charging groove 342 decreases as it extends in the insertion direction.

Accordingly, when the length 160L of the receiver unit 160 is less than or equal to the first length 341L and greater than the second length 342L based on the width direction (the direction of the WD arrow), the receiver mechanism Position 160 may be aligned by being guided along the inclination of the first limiting surface 3432 with respect to the width direction (WD axis direction) in the process of being inserted into the first charging groove 341 . . In addition, when the length 160L of the receiver unit 160 is equal to or less than the second length 342L with respect to the width direction (the direction of the WD arrow), the receiver unit 160 is disposed in the second charging groove 342 . ), the position may be aligned by being guided along the inclination of the second limiting surface 3442 with respect to the width direction (WD axis direction) in the process of being inserted.

Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention includes the wireless power transmission coil 31 and the wireless power transmission coil 31 to the extent that sufficient charging efficiency and sufficient charging speed can be obtained for the receiver unit 160 formed in various sizes. It is possible to improve the accuracy of the operation of aligning the wireless power receiving coil (150).

5 to 8, the transmission mechanism 34 is illustrated as including two charging grooves, but is not limited thereto, and the transmission mechanism 34 may be implemented to include three or more charging grooves. In this case, the filling groove disposed in the insertion direction may be formed in a smaller size. Therefore, the charging device 1 for a miniature electric vehicle according to the present invention can improve the versatility of performing wireless charging for the receiver unit 160 formed in various sizes.

Referring to FIG. 9 , the second limiting surface 3442 may be inclined so that the size of the second charging groove 342 decreases as it extends in the insertion direction. The first limiting surface 3432 may be inclined so that the size of the first charging groove 341 decreases as it extends in the insertion direction. In this case, the second limiting surface 3442 and the first limiting surface 3432 may be inclined at the same angle to be connected to each other. That is, the second limiting surface 3442 and the first limiting surface 3432 may form one inclined surface. Accordingly, the second charging groove 342 and the first charging groove 341 may be implemented as one charging groove implemented in a funnel-shaped structure. In this case, the first support surface 3431 (shown in FIG. 8 ) may be omitted.

Referring to FIG. 10 , the wireless charging unit 3 may include a flexible mechanism 35 . The flexible mechanism 35 may be coupled to the second rotation mechanism 33 . The second rotation mechanism 33 may be implemented with two parts based on the flexible mechanism 35 , and the two parts may be implemented by being coupled through the flexible mechanism 35 . By providing the flexible mechanism 35, the second rotation mechanism 33 can be bent so that the transmission mechanism 34 and the receiver mechanism 160 are disposed in parallel with each other and contacted. Therefore, in the charging device 1 for a miniature electric vehicle according to the present invention, the wireless power transmitting coil 31 and the wireless power receiving coil 150 are arranged parallel to each other using the flexible mechanism 35. Wireless charging may be implemented. Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention can further improve the charging efficiency and charging speed of the miniature electric vehicle 100 . The flexible mechanism 35 may be formed of a metal bellows or the like.

Referring to FIG. 10 , the wireless charging unit 3 may include a non-slip pad 36 . The non-slip pad 36 may be coupled to the transmission mechanism 34 . The anti-skid pad 36 may be coupled to one surface of the transmission mechanism 34 facing the receiver unit 160 . The non-slip pad 36 may prevent slippage or the like from occurring while the transmission mechanism 34 and the receiver mechanism 160 are in contact with each other. Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention can provide a stable charging environment. The anti-slip pad 36 may be formed to have a greater frictional force than one surface of the transmission mechanism 34 . For example, the anti-slip pad 36 may be formed of a material having a large frictional force, thereby implementing an anti-slip function. For example, the anti-slip pad 36 is formed with a plurality of grooves to increase frictional force, thereby implementing an anti-slip function. The anti-skid pad 36 may be coupled to only a portion of the transmission mechanism 34 . For example, the non-slip pad 36 may be coupled only to the first support surface 3431 and the second support surface 3441 .

Here, since the miniature electric vehicle 100 may be implemented in various sizes depending on the type, displacement, design factors, etc., the first wheel 120 may also be formed in various sizes. In this way, even if the first wheel 120 is formed in various sizes, the charging device 1 for a miniature electric vehicle according to the present invention is the wireless power transmission coil 31 to the extent that sufficient charging efficiency and sufficient charging speed can be obtained. and the wireless power receiving coil 150 may be implemented to be aligned. Looking at this in detail, it is as follows.

1 to 4 and 11 to 15 , the accommodating part 4 may include a first accommodating groove 41 and a second accommodating groove 42 .

The first accommodating groove 41 is formed in the accommodating part 4 . The first accommodating groove 41 may be a groove formed to a predetermined depth on the upper surface of the accommodating part 4 . The first accommodating groove 41 may be formed to open the upper surface of the accommodating part 4 . Accordingly, when the micro electric vehicle 100 moves in the entry direction and the first wheel 120 reaches the first accommodating groove 41 , the first wheel 120 moves in the first accommodating groove. By being inserted into (41), the first rotating mechanism (31) can be pressed. The first receiving groove 41 may be formed to have a first width 41H (shown in FIG. 11 ) based on the width direction (WD axis direction).

The second accommodating groove 42 is formed in the accommodating part 4 . The second accommodating groove 42 may be a groove formed to a predetermined depth on the upper surface of the accommodating part 4 . The second accommodating groove 42 may be formed to be connected to the first accommodating groove 41 . Accordingly, the second accommodating groove 42 and the first accommodating groove 41 may be formed to open the upper surface of the accommodating part 4 . Based on the receiving direction in which the first wheel 120 is inserted into the receiving part 4 , the second receiving groove 42 may be disposed below the first receiving groove 41 . The second receiving groove 42 may be formed to have a second width 42H (shown in FIG. 11 ) based on the width direction (WD axis direction). The second width 42H may be implemented to be shorter than the first width 41H. Accordingly, the second accommodating groove 42 may be formed to have a shorter width than the first accommodating groove 41 based on the width direction (WD axis direction).

In the second receiving groove 42 , the first wheel 120 is selectively selected according to the width (120H, shown in FIG. 11 ) of the first wheel 120 with respect to the width direction (WD axis direction). can be inserted into 11 and 12 , the width 120H of the first wheel 120 is equal to or less than the first width 41H and the second width 42H based on the width direction (the direction of the WD arrow). ), the first wheel 120 may not be inserted into the second accommodating groove 42 , but may be inserted only into the first accommodating groove 41 . 11 and 13, when the width 120H of the first wheel 120 is equal to or less than the second width 42H based on the width direction (the WD arrow direction), the first wheel ( 120 may be inserted into both the first accommodating groove 41 and the second accommodating groove 42 .

Meanwhile, based on the receiving direction in which the first wheel 120 is inserted into the receiving part 4 , the second receiving groove 42 may be disposed below the first receiving groove 41 . . Accordingly, when the first wheel 120 is accommodated in both the first accommodating groove 41 and the second accommodating groove 42 compared to the case where the first wheel 120 is accommodated only in the first accommodating groove 41 , the first The rotating mechanism 32 may be implemented to rotate at a larger rotation angle. As the rotation angle of the first rotation mechanism 32 increases, the distance for raising the transmission mechanism 34 increases, so that the transmission mechanism 34 can be implemented to rise to a higher height. Therefore, even if the first wheel 120 is formed in various widths 120H, the charging device 1 for a miniature electric vehicle according to the present invention is the wireless power transmission coil to such an extent that sufficient charging efficiency and sufficient charging speed can be obtained. (31) and the wireless power receiving coil 150 may be implemented so as to be aligned. The smaller the width 120H of the first wheel 120 is, the smaller the size of the wireless power receiving coil 150 is. Therefore, the wireless power receiving coil must be raised to a higher height by the transmitting mechanism 34. This is because, by reducing the separation distance between 150 and the wireless power transmission coil 31, sufficient charging efficiency and sufficient charging speed can be obtained. For example, when the first wheel 120 is accommodated in the second accommodating groove 42 , the receiver 160 may be inserted into the second charging groove 342 (shown in FIG. 7 ). For example, when the first wheel 120 is accommodated only in the first receiving groove 41 , the receiver unit 160 may be inserted into the first charging groove 341 (shown in FIG. 6 ).

The accommodating part 4 may include a first accommodating member 43 and a second accommodating member 44 .

The first accommodating member 43 supports the first wheel 120 inserted into the first accommodating groove 41 . When the width 120H of the first wheel 120 is less than the first width 41H and greater than the second width 42H based on the width direction (WD arrow direction), the first wheel ( 120 may not be inserted into the second accommodating groove 42 , but may be inserted only into the first accommodating groove 41 to be supported by the first accommodating member 43 .

The first accommodating member 43 may include a first accommodating surface 431 and a first alignment surface 432 .

The first receiving surface 431 supports the first wheel 120 under the first wheel 120 inserted into the first receiving groove 41 . When the width 120H of the first wheel 120 is less than the first width 41H and greater than the second width 42H based on the width direction (WD arrow direction), the first receiving surface Reference numeral 431 supports the first wheel 120 to limit the degree to which the first wheel 120 is inserted into the accommodating part 4 . Accordingly, the distance at which the transmission mechanism 34 rises may be limited.

The first alignment surface 432 is disposed on both sides of the first receiving groove 41 based on the width direction (WD axis direction). Accordingly, the first alignment surface 432 may limit a movable distance of the first wheel 120 inserted into the first receiving groove 41 in the width direction (WD axis direction). Accordingly, in the charging device 1 for an ultra-small electric vehicle according to the present invention, while wireless charging is performed in a state in which the first wheel 120 is inserted into the first receiving groove 41, the width direction (WD arrow direction) ), it is possible to reduce the degree of misalignment between the wireless power transmission coil 31 and the wireless power reception coil 150 due to the occurrence of vibration, shaking, etc. Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention can improve the stability of wireless charging for the miniature electric vehicle 100 .

The second accommodating member 44 supports the first wheel 120 inserted into the second accommodating groove 42 . When the width 120H of the first wheel 120 is less than or equal to the second width 42H based on the width direction (the direction of the WD arrow), the first wheel 120 is formed in the second receiving groove 42 ) may be inserted into and supported by the second accommodating member 44 .

The second accommodating member 44 may include a second accommodating surface 441 and a second alignment surface 442 .

The second receiving surface 441 supports the first wheel 120 under the first wheel 120 inserted into the second receiving groove 42 . When the width 120H of the first wheel 120 is less than the second width 42H based on the width direction (the direction of the WD arrow), the second receiving surface 441 is the first wheel 120 . ), it is possible to limit the degree to which the first wheel 120 is inserted into the receiving portion (4). Accordingly, the distance at which the transmission mechanism 34 rises may be limited.

The second alignment surface 442 is disposed on both sides of the second receiving groove 42 based on the width direction (WD axis direction). Accordingly, the second alignment surface 442 may limit the movable distance of the first wheel 120 inserted into the second receiving groove 42 in the width direction (WD axis direction). Therefore, the charging device 1 for a miniature electric vehicle according to the present invention is for wireless charging of the miniature electric vehicle 100 performed in a state in which the first wheel 120 is inserted into the second accommodating groove 42. stability can be improved.

Referring to FIG. 13 , the second alignment surface 442 and the first receiving surface 431 may be formed to be connected to each other. In this case, an included angle 43a between the second alignment surface 442 and the first receiving surface 431 may be implemented to form a right angle. In this case, the accommodating part 4 may be implemented in a stepped structure.

Referring to FIG. 14 , the included angle 43a between the second alignment surface 442 and the first receiving surface 431 may be implemented to form an obtuse angle. That is, the included angle 43a may be implemented to be greater than 90 degrees and smaller than 180 degrees. In this case, the first alignment surface 432 may be inclined so that the size of the first receiving groove 41 decreases as it extends in the receiving direction. The second alignment surface 442 may be inclined so that the size of the second receiving groove 42 decreases as it extends in the receiving direction.

Accordingly, when the width 120H of the first wheel 120 is less than or equal to the first width 41H and greater than the second width 42H based on the width direction (the direction of the WD arrow), the second One wheel 120 is guided along the inclination of the first alignment surface 432 with respect to the width direction (WD axis direction) in the process of being inserted into the first receiving groove 41 so that the position is aligned. can In addition, when the width 120H of the first wheel 120 is less than or equal to the second width 42H based on the width direction (the direction of the WD arrow), the first wheel 120 is the second receiving groove. Positions may be aligned by being guided along the inclination of the second alignment surface 442 with respect to the width direction (WD axis direction) in the process of being inserted at 42 .

Accordingly, in the charging device 1 for a miniature electric vehicle according to the present invention, even if the first wheel 120 is formed in various sizes, the wireless power transmission coil 31 to the extent that sufficient charging efficiency and sufficient charging speed can be obtained. ) and the accuracy of the operation of aligning the wireless power receiving coil 150 can be improved.

11 to 14 , the accommodating part 4 is illustrated as including two accommodating grooves, but the present invention is not limited thereto, and the accommodating part 4 may be implemented to include three or more accommodating grooves. In this case, the receiving groove disposed in the receiving direction may be formed in a smaller size. Therefore, the charging device 1 for a miniature electric vehicle according to the present invention can improve the versatility of performing wireless charging for the miniature electric vehicle 100 having the first wheel 120 of various sizes.

Referring to FIG. 15 , the second alignment surface 442 may be inclined so that the size of the second receiving groove 42 decreases as it extends in the receiving direction. The first alignment surface 432 may be inclined so that the size of the first receiving groove 41 decreases as it extends in the receiving direction. In this case, the second alignment surface 442 and the first alignment surface 432 may be inclined at the same angle to be connected to each other. That is, the second alignment surface 442 and the first alignment surface 432 may form one inclined surface. Accordingly, the second accommodating groove 42 and the first accommodating groove 41 may be implemented as one accommodating groove implemented in a funnel-shaped structure. In this case, the first receiving surface 431 (shown in FIG. 14 ) may be omitted.

Referring to FIGS. 1, 2, and 16 , the cradle 2 may include a cradle body 21 .

The mounting body 21 is to which the miniature electric vehicle 100 is mounted. The micro electric vehicle 100 is moved in the entry direction and disposed on the upper surface of the cradle body 21 , so that it can be mounted on the cradle body 21 . In a state in which the miniature electric vehicle 100 is mounted on the mounting body 21 , the miniature electric vehicle 100 may be maintained in a standing state through a stand. The mounting body 21 may be implemented to increase in height as it extends in the entry direction. Accordingly, a space in which the second rotation mechanism 33 and the transmission mechanism 34 can rotate can be secured inside the mounting body 21 . When the first wheel 120 is accommodated in the accommodating part 4 , the mounting body 21 supports the rear surface of the first wheel 120 accommodated in the accommodating part 4 , so that the micro electric It is possible to prevent the vehicle 100 from moving in a direction opposite to the entry direction.

1, 2, and 16 , the mounting part 2 may include a first guide mechanism 22 and a second guide mechanism 23 .

The first guide mechanism 22 guides the micro electric vehicle 100 moving in the entry direction. Based on the entry direction, the first guide mechanism 22 may be disposed on the rear side with respect to the second guide mechanism 23 . Based on the entry direction, the second guide mechanism 23 may be disposed on the rear side with respect to the receiving part 4 . Accordingly, in the process of moving the micro electric vehicle 100 in the entry direction, the first wheel 120 passes through the first guide mechanism 22 and the second guide mechanism 23 sequentially. Afterwards, it may be accommodated in the receiving part (4).

The first guide mechanism 22 may include a first guide groove 221 and a first guide surface 222 .

The first guide groove 221 may be implemented as a groove formed to a predetermined depth on the upper surface of the mounting body 21 . In the process of moving the micro electric vehicle 100 in the entry direction, the first wheel 120 may be inserted into the first guide groove 221 to move along the upper surface of the mounting body 21 . The first guide groove 221 may be formed to decrease in size in the width direction (WD axis direction) as it extends toward the entry direction.

The first guide surface 222 is disposed on both sides of the first guide groove 221 in the width direction (WD axis direction). Since the first guide groove 221 is formed to decrease in size in the width direction (WD axis direction) as it extends toward the entry direction, the first guide surface 222 may be formed to form an inclined surface. Accordingly, when the first wheel 120 is in contact with the first guide surface 222 as shown by a dotted line in FIG. 16 , as shown by a solid arrow in FIG. 16 , the first wheel 120 is A position may be guided to be aligned along the first guide surface 222 . Accordingly, in the charging device 1 for a micro electric vehicle according to the present invention, the width direction WD by the first guide mechanism 22 in the process of moving the micro electric vehicle 100 toward the entry direction for mounting. axial direction) may be implemented to be aligned.

The second guide mechanism 23 guides the micro electric vehicle 100 moving in the entry direction. The second guide mechanism 23 may be disposed between the accommodating part 4 and the first guide mechanism 22 .

The second guide mechanism 23 may include a second guide groove 231 and a second guide surface 232 .

The second guide groove 231 may be implemented as a groove formed to a predetermined depth on the upper surface of the mounting body 21 . In the process of moving the micro electric vehicle 100 in the entry direction, the first wheel 120 may be inserted into the second guide groove 231 to move along the upper surface of the mounting body 21 . The second guide groove 231 may be formed to have a uniform size in the width direction (WD axis direction) as it extends toward the entry direction.

The second guide surface 232 is disposed on both sides of the second guide groove 231 in the width direction (WD axis direction). The second guide surface 232 may limit a movable distance of the first wheel 120 based on the width direction (WD axis direction). Therefore, in the charging device 1 for a miniature electric vehicle according to the present invention, in the process of further movement after the position of the first wheel 120 is aligned by the first guide mechanism 22, the first wheel ( 120) can reduce the degree of misalignment.

Referring to FIGS. 1, 2, 16, and 17 , the mounting part 2 may include a mounting groove 24 and a supporting member 25 .

The mounting groove 24 is into which the second wheel 130 of the micro electric vehicle 100 is inserted. The mounting groove 24 may be implemented as a groove formed to a predetermined depth on the upper surface of the mounting body 21 . The mounting groove 24 may be formed to be connected to the first guide groove 221 . When the first wheel 120 is accommodated in the receiving part 4 , the second wheel 130 may be inserted into the mounting groove 24 .

The support member 25 supports the second wheel 130 inserted into the mounting groove 24 . The support member 25 may be disposed at the rear with respect to the second wheel 130 inserted into the mounting groove 24 based on the entry direction. Accordingly, by supporting the second wheel 130 , the support member 25 can prevent the micro electric vehicle 100 from moving backward in the mounted state.

Although not shown, the mounting portion 2 may include a plurality of each of the mounting groove 24 and the supporting member 25 . Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention performs wireless charging for various miniature electric vehicles 100 having different separation distances between the first wheel 120 and the second wheel 130 . The versatility that can be done can be improved.

11 and 17 , the mounting part 2 may include a drainage channel 26 .

The drain channel 26 is for draining the fluid accumulated in the mounting body 21 . The drainage channel 26 may be formed to pass through the mounting body 21 . Accordingly, the charging device 1 for a miniature electric vehicle according to the present invention can reduce the risk of an electrical safety accident due to the fluid accumulated in the mounting body 21 . The drainage channel 26 may be formed to extend from the top surface of the mounting body 21 to the bottom surface of the mounting body 21 .

As shown in FIG. 17 , the drainage channel 26 may be disposed to be connected to the mounting groove 24 . Accordingly, the drain channel 26 drains the fluid flowing from the second wheel 130 , thereby reducing the amount of fluid accumulated in the mounting groove 24 .

As shown in FIG. 11 , the drain 26 may be arranged to be connected to the receiving groove of the receiving part 4 . Accordingly, the rear passage 26 drains the fluid flowing from the first wheel 120 , thereby reducing the amount of fluid accumulated in the accommodating part 4 .

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications, and changes are possible without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

1: Charging device for ultra-small electric vehicle 2: Mounting part
3: wireless charging part 4: receiving part
21: mounting body 22: first guide mechanism
23: second guide mechanism 24: mounting groove
25: support member 26: drainage channel
31: wireless charging transmission coil 32: first rotating mechanism
33: second rotation mechanism 34: transmission mechanism
35: flexible mechanism 41: first receiving groove
42: second accommodating groove 43: first accommodating member
44: second accommodating member 341: first charging groove
342: second charging groove 343: first support member
344: second support member 100: micro electric vehicle

Claims (11)

a cradle on which a miniature electric vehicle is mounted;
a wireless charging unit coupled to the cradle and configured to perform wireless charging on the miniature electric vehicle mounted on the cradle; and
and a accommodating part for accommodating the first wheel of the miniature electric vehicle mounted on the cradle;
The wireless charging unit includes a wireless power transmission coil for transmitting power to the wireless power receiving coil of the micro electric vehicle, a first rotating mechanism that rotates according to being pressed by the first wheel accommodated in the receiving unit, and the first rotating mechanism. A second rotation mechanism connected to the first rotation mechanism to rotate together as it rotates, and a transmission mechanism coupled to the second rotation mechanism to rotate together with the second rotation mechanism and to which the wireless power transmission coil is coupled,
The second rotation mechanism raises the transmission mechanism so that the transmission mechanism comes into contact with the receiver mechanism to which the wireless power receiving coil is coupled while rotating with the rotation as the first rotation mechanism is pressed by the first wheel,
The transmission mechanism includes a first charging groove formed to have a first length based on a width direction perpendicular to a traveling direction in which the micro electric vehicle travels, and a shorter length than the first length based on the width direction. It includes a second charging groove formed to have a second length,
The second charging groove is disposed at a position where the distance spaced apart from the wireless power transmission coil is shorter than that of the first charging groove based on the insertion direction in which the receiver device is inserted,
The charging device for a miniature electric vehicle, characterized in that the receiver device is selectively inserted into the second charging groove according to the length of the receiver device based on the width direction. According to claim 1,
The transmission mechanism includes a first support member for supporting the receiver device inserted into the first charging groove, and a second support member for supporting the receiver mechanism inserted into the second charging groove,
The first support member is disposed on both sides of the first charging groove based on a first support surface for supporting the opposite surface of the receiver inserted into the first charging groove, and the width direction, and is in the first charging groove. The inserted receiver device includes a first limiting surface for limiting the movable distance along the width direction,
The second support member is disposed on both sides of the second charging groove with respect to a second support surface for supporting the opposite surface of the receiver inserted into the second charging groove, and the width direction, so as to be in the second charging groove. and a second limiting surface for limiting a movable distance of the inserted receiver device along the width direction,
The second limiting surface and the first support surface are formed to be connected to each other, and the included angle between the second limiting surface and the first support surface is connected to form a right angle or an obtuse angle. A charging device for an ultra-small electric vehicle. 3. The method of claim 2,
The first limiting surface is formed to be inclined so that the size of the first charging groove decreases as it extends in the insertion direction,
The second limiting surface is a charging device for a miniature electric vehicle, characterized in that formed to be inclined so that the size of the second charging groove decreases as it extends in the insertion direction. According to claim 1,
The transmission mechanism is disposed on both sides of the first charging groove based on the width direction, a first limiting surface for limiting the distance the receiver device inserted into the first charging groove can move along the width direction, and the width and a second limiting surface disposed on both sides of the second charging groove based on the direction to limit the distance the receiver device inserted into the second charging groove can move along the width direction,
The first limiting surface is formed to be inclined so that the size of the first charging groove decreases as it extends in the insertion direction,
The second limiting surface is formed to be inclined so that the size of the second charging groove decreases as it extends in the insertion direction,
The charging device for a miniature electric vehicle, characterized in that the second limiting surface and the first limiting surface are inclined at the same angle to be connected to each other. According to claim 1,
The accommodating part includes a first accommodating groove formed to have a first width with respect to the width direction, and a second accommodating groove formed to have a second width shorter than the first width in the width direction, and ,
The second accommodating groove is disposed at a position deeper than the first accommodating groove based on the receiving direction in which the first wheel is inserted,
The first wheel is selectively accommodated in the second receiving groove according to the width of the first wheel with respect to the width direction,
The first rotation mechanism is arranged to rotate at a larger rotation angle when the first wheel is accommodated in the second accommodation groove than when the first wheel is accommodated in the first accommodation groove,
The second rotating mechanism is a charging device for a miniature electric vehicle, characterized in that connected to the first rotating mechanism so that as the rotational angle of the first rotating mechanism increases, the distance at which the transmission mechanism is raised increases. a cradle on which a miniature electric vehicle is mounted;
a wireless charging unit coupled to the cradle and configured to perform wireless charging on the miniature electric vehicle mounted on the cradle; and
and a accommodating part for accommodating the first wheel of the miniature electric vehicle mounted on the cradle;
The wireless charging unit includes a wireless power transmission coil for transmitting power to the wireless power receiving coil of the miniature electric vehicle, a first rotating mechanism that rotates according to being pressed by the first wheel accommodated in the accommodating unit, and the first rotating mechanism. A second rotation mechanism connected to the first rotation mechanism to rotate together as it rotates, and a transmission mechanism coupled to the second rotation mechanism to rotate together with the second rotation mechanism and to which the wireless power transmission coil is coupled,
The accommodating portion includes a first accommodating groove formed to have a first width with respect to a width direction perpendicular to a running direction in which the micro electric vehicle travels, and a second accommodating groove shorter than the first width based on the width direction. and a second accommodating groove formed to have two widths,
The second accommodating groove is disposed at a position deeper than the first accommodating groove based on the receiving direction in which the first wheel is inserted,
The first wheel is selectively accommodated in the second receiving groove according to the width of the first wheel with respect to the width direction,
The first rotation mechanism is arranged to rotate at a larger rotation angle when the first wheel is accommodated in the second accommodation groove than when the first wheel is accommodated in the first accommodation groove,
The second rotation mechanism raises the transmission mechanism so that the transmission mechanism comes into contact with the receiver mechanism to which the wireless power receiving coil is coupled, while the first rotation mechanism rotates together as the first rotation mechanism is pressed by the first wheel and rotates. A charging device for an ultra-small electric vehicle, characterized in that it is connected to the first rotation mechanism so that the distance at which the transmission mechanism is raised increases as the rotation angle at which the first rotation mechanism is rotated increases. 7. The method according to claim 5 or 6,
The accommodating part includes a first accommodating member for supporting the first wheel inserted into the first accommodating groove, and a second accommodating member for supporting the first wheel inserted into the second accommodating groove,
The first accommodating member is disposed on both sides of the first accommodating groove based on a first accommodating surface supporting the first wheel under the first wheel inserted into the first accommodating groove, and the width direction, so that the The first wheel inserted into the first receiving groove includes a first alignment surface for limiting the movable distance along the width direction,
The second accommodating member is disposed on both sides of the second accommodating groove based on a second accommodating surface for supporting the first wheel under the first wheel inserted into the second accommodating groove, and the width direction. The first wheel inserted into the second receiving groove includes a second alignment surface for limiting the movable distance along the width direction,
The second alignment surface and the first receiving surface are formed to be connected to each other, and an included angle between the second alignment surface and the first receiving surface is connected to form a right angle or an obtuse angle. A charging device for an ultra-small electric vehicle. 7. The method according to claim 5 or 6,
The accommodating portion is disposed on both sides of the first accommodating groove based on the width direction, a first alignment surface that limits the distance that the first wheel inserted into the first accommodating groove can move along the width direction, and the width and a second alignment surface disposed on both sides of the second receiving groove based on the direction to limit the distance the first wheel inserted into the second receiving groove can move along the width direction,
The first alignment surface is formed to be inclined so that the size of the first receiving groove decreases as it extends in the receiving direction,
The second alignment surface is formed to be inclined so that the size of the second receiving groove decreases as it extends in the receiving direction,
The charging device for a miniature electric vehicle, characterized in that the second alignment surface and the first alignment surface are inclined at the same angle to be connected to each other. 7. The method of claim 1 or 6,
The holding portion includes a first guide mechanism for guiding the micro electric vehicle moving in the entry direction so that the first wheel is accommodated in the accommodation portion, and a second guide mechanism disposed between the first guide mechanism and the accommodation portion. and
The first guide mechanism is disposed on both sides of a first guide groove formed to decrease in size in a width direction perpendicular to the entry direction as it extends toward the entry direction, and on both sides of the first guide groove based on the width direction. Includes a first guide surface for guiding the first wheel based on the width direction,
The second guide mechanism is disposed on both sides of the second guide groove into which the first wheel passing through the first guide groove is inserted, and the second guide groove in the width direction, so that the second guide groove is the second guide groove in the width direction. A charging device for an ultra-small electric vehicle, characterized in that it includes a second guide surface that limits the distance that one wheel can move. According to claim 1 or 6, wherein the mounting portion
a cradle main body for supporting a micro electric vehicle moving in an entry direction so that the first wheel is accommodated in the accommodating part;
a cradle groove formed in the cradle body so that the second wheel of the micro electric vehicle accommodated in the accommodating part of the first wheel is inserted;
a support member disposed at the rear with respect to the second wheel inserted into the mounting groove with respect to the entry direction to support the second wheel;
a through hole formed by passing the transmission mechanism so that the transmission mechanism rises and protrudes upward of the holder body or the transmission mechanism descends to be located inside the holder body; and
and a drainage channel formed in the stationary body to drain the fluid accumulated in the stationary body. 7. The method of claim 1 or 6,
The wireless charging unit includes a non-slip pad coupled to the transmission mechanism,
The non-slip pad is a charging device for a miniature electric vehicle, characterized in that coupled to one surface of the transmission mechanism facing the receiver mechanism.

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