CN107585044B - A passive passive alignment device for wireless charging of electric vehicles - Google Patents

Abstract

The invention discloses a passive passive alignment device for wireless charging of electric vehicles, which comprises a transmitting device installed on the ground of a parking space and a receiving device installed on the chassis of the vehicle; The device mainly includes a tablet, a wireless charging receiving plate, and a roller. The device does not need to use a motor or other energy sources. When the car enters the parking space, the wireless charging transmitting plate slides into the range of the tablet through the roller, and finally is passively connected with the wireless charging receiving plate. Alignment to achieve wireless charging, and the device can achieve zero-distance contact between the transmitting device and the receiving device, which can minimize magnetic flux leakage. In addition, the transmitting device and the receiving device can be realized without waiting when the car leaves the parking space. The device separates automatically.

Description

A passive passive alignment device for wireless charging of electric vehicles

technical field

The present invention relates to electric vehicles, in particular to passive passive automatic alignment of wireless charging of electric vehicles.

Background technique

Wired charging of electric vehicles has disadvantages such as inconsistent standards, short lifespan, and insecurity, and requires manual plugging and unplugging, which is inconvenient to use. The wireless charging of electric vehicles realizes the wireless transmission of electric energy through the electric energy transmitting device in the parking space and the electric energy receiving device on the car. It is a better solution to replace the wired charging. . Wireless charging technologies for electric vehicles, such as technical solutions based on inductive coupling or capacitive coupling, generally require the spatial alignment of the transmitting device and the receiving device, otherwise the power transmission efficiency will be affected. For inductively coupled wireless charging, due to the large distance (15cm-30cm) between the transmitting and receiving devices, there will be a strong magnetic leakage, which may not only affect the safety of the human body, but also make the surrounding metal Objects generate thermal effects that can cause fires and explosions. Therefore, the wireless charging technology of electric vehicles needs an auxiliary device that can realize the alignment of the transmitting and receiving devices and reduce the distance between them. At present, there are existing patents and technologies, mainly using a driving motor to move the transmitting device or the receiving device in a certain way, so as to achieve the purpose of aligning the two and reducing the mutual distance. For example, Chinese Patent No. 201620549861.X (patent name: a system for improving the efficiency of wireless charging of electric vehicles), 201620508910.5 (a self-centering wireless charging device for electric vehicles),

201621078552.5 (a wireless charging system for electric vehicles), 201611223339.3 (swing-type height adjusters for wireless charging of electric vehicles), all disclose varying degrees of alignment and/or distance reduction between the transmitter and receiver, but these techniques all use motor driven. The use of motor drives will greatly increase the manufacturing cost of wireless charging systems, reduce reliability and increase maintenance costs. To minimize flux leakage, the transmitter and receiver will eventually come into contact with each other. In the implementation scheme using the motor, when the electric vehicle needs to leave the parking space, it must wait for the motor to start and completely separate the transmitting and receiving devices before it can move. Otherwise, physical contact between the transmitting device and the receiving device could damage the entire device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art, and propose a passive passive alignment device for wireless charging of electric vehicles, which does not require the use of motors or other energy sources, and realizes passive alignment when the car drives into a parking space. The wireless charging transmitting device and the receiving device are in 0-distance contact, and the transmitting device and the receiving device are automatically separated without waiting when the car leaves the parking space.

A passive passive alignment device for wireless charging of electric vehicles, comprising a transmitting device installed on the ground of a parking space and a receiving device installed on the chassis of the vehicle;

The launch device includes a launch part and a support part, the launch part includes a wireless charging launch plate and an outer wheel arranged on the outer periphery of the wireless charging launch plate, the outer wheel can rotate around the launch plate, the support part includes a support rod and a horizontal rotating arm, wireless charging The bottom of the launch plate is connected to the upper end of the support rod through a first joint, and the launch plate can rotate around an axis perpendicular to the support rod. One end of the rotating arm is installed on the ground through a second joint and can rotate in the horizontal plane around the second joint. Connected with the other end of the rotating arm, the support rod can rotate around the connecting end in the vertical plane where the rotating arm is located, and a return spring is provided at the first joint, the connecting end of the support rod and the rotating arm, and the second joint;

The receiving device includes a flat plate, a wireless charging receiving plate, and a roller, the flat plate is installed on the bottom of the vehicle, the roller is horizontally installed at the front end of the flat plate, and the axis of the roller is flush with the front crash barrier, and the wireless charging receiving plate is installed at the rear end of the upper surface of the flat plate, A guide fence is provided along the periphery on the lower surface of the flat plate for restricting and guiding the movement of the launching plate.

The flat plate is gradually narrowed from the front end to the rear end, and the final end is in a smooth arc shape.

The wireless charging receiving board is embedded on the tablet. This arrangement can further reduce the gap between the transmitting board and the receiving board, and can realize zero-distance bonding between the two.

The smooth transition between the roller and the lower surface of the plate can help the launch plate to slide naturally from the roller into the plate range when the car is moving forward, and the launch plate can slide out from the plate smoothly through the roller when the car retreats after charging.

The support rod and/or the rotating arm are telescopic structures.

The support member can also adopt the following solutions:

It includes a telescopic structure and a base with a strip-shaped sliding groove. The two ends of the sliding groove are provided with limit plates. The telescopic structure is vertically arranged in the middle of the sliding groove. The structure is formed by placing the upper support arm in the lower support arm, and the upper end of the upper support arm is connected with the first joint.

The launching component can also adopt the following scheme:

It includes a wireless charging launching board, a shaft and a third joint. The wireless charging launching board is connected to the bearing of the third joint through the shaft, so that it can freely rotate around the third joint in the plane where the board is located, and the third joint is used to connect with the supporting part.

The beneficial effects of the present invention are:

The device of the present invention does not need to use motors or other energy sources, and can realize passive alignment for wireless charging when the car enters the parking space, and through the unique structural design, the wireless charging transmitting device and the receiving device can achieve 0-distance contact, and the maximum The magnetic flux leakage is reduced to a certain extent, and the transmitting device and the receiving device can be automatically separated without waiting when the car leaves the parking space.

Description of drawings

Fig. 1 is the structural representation of a kind of launching device of the present invention;

2 is a schematic structural diagram of a receiving device of the present invention;

Fig. 3 is the scene schematic diagram when concrete application;

4 is a schematic diagram of an alignment process of a transmitting device and a receiving device;

5 is a schematic plan view of the alignment process of the transmitting device and the receiving device;

Fig. 6 is the structural representation of a kind of support member in the present invention;

Fig. 7 is the structural representation of a kind of emitting part in the present invention;

FIG. 8 is a schematic plan view of the alignment process of the transmitting device and the receiving device in another case.

Detailed ways

Referring to FIGS. 1 to 8 , the passive passive alignment device for wireless charging of electric vehicles of the present invention will be further explained below with reference to specific examples.

As shown in Fig. 1, the launching device is installed on the ground of the parking space, and includes a wireless charging launching plate 1, and an outer wheel 6 is arranged outside it, and the outer wheel can rotate around the launching plate. The bottom of the wireless charging launch board is provided with a first connector 7 (wireless charging launch board is connected to the power supply), the first connector is connected to a support rod 9, and the launch board can rotate around an axis perpendicular to the support rod (also perpendicular to the vehicle's forward direction). A spring 8 is provided at the first joint, which springs the launch plate to rotate in a clockwise direction as shown in Figure 1, until a designated or defined position is reached. The angle between the final launch plate and the support rod can be adjusted by installing a limit device at the connection or adding a limit plate on the support rod. The support rod is connected with the horizontal rotating arm 11, and a spring 10 is arranged at the connection, and the spring makes the support rod rotate clockwise as shown in FIG. 1 until it reaches a designated or defined position. The final angle between the support rod and the rotating arm can be achieved by installing a limit device at the connection. The swivel arm is mounted on the ground through the second joint 13 . The position of the second joint 13 is fixed, and the rotating arm can rotate left and right around the second joint 13 along a horizontal plane. A spring 12 is set at the joint position, one end of the spring is connected with the second joint 13, and the other end is connected with the rotating arm 11, so that the rotating arm can automatically return to the initial position (the initial position can be set to be perpendicular to the forward direction of the vehicle). The support rod and/or the rotating arm can be telescopic, can be extended under the action of external force, and will return to a shortened state after the external force is removed.

As shown in FIG. 2 , the receiving device is installed on the chassis of the vehicle, and the wireless charging receiving board 2 is installed on the vehicle-facing side of the tablet 4, and the position is fixed. The receiving plate 2 can be embedded in the flat plate 4 . A roller 5 is arranged on the flat plate 4, and the axis of the roller is flush with the front bumper. The installation position should be such that when the car drives into the parking position, the roller first touches the launch plate. The radian of the flat plate can be appropriately increased at the position close to the drum to make it tangent to the drum or to have a smooth transition, so that the launch plate can smoothly move back and forth on the flat plate. A guide fence 3 is arranged around the flat plate 4 to limit and guide the moving direction of the launch plate. The flat plate 4 can be set to be gradually narrowed from the front end to the rear end, and the end is smooth arc.

As shown in Figure 3, when charging, when the car drives from right to left into the parking position (stage I) and reaches the position A shown in the figure, the roller 5 installed in front of the car will first contact the launcher in the initial position device. Under the action of the car's thrust, since the angle between the launch plate 1 and the support rod 9 has been limited, the launch plate can no longer rotate clockwise, so the support rod will rotate counterclockwise until the car reaches position B (stage II), at this time the roller Reach the point where the launch plate connects to the support rod. When the car passes the position B, due to the action of the spring at the connection between the support rod and the rotating arm, the support rod generates a clockwise force F (stage III), which supports the launch plate upward through the connection point between the support rod and the launch plate. , so that it is close to the flat plate 4 placed on the chassis of the vehicle.

When the car enters the parking space, if the launch plate and the receiving plate are not in the same straight line, but there is a lateral offset (relative to the direction of the car's advance and retreat), as shown in Figures 4 and 5, the launch plate is limited by the guide fence 3. Guiding, through the rotation of each joint, it will finally be aligned with the receiving plate: when the car reaches the position C in Figure 3, the transmitting plate and the bottom plate 4 of the vehicle are in close contact. At this time, the transmitting plate 1 and the plate 4 The relative position is shown as relative position 1 in Figure 5. When the car moves forward, the guide fence moves forward, and the guide fence forces the launch plate to rotate counterclockwise around the second joint (direction in the figure) until the two move relative to each other. Relative position 2, at this time, the transmitting plate and the receiving plate on the flat plate are completely aligned and basically fit. If the receiving plate 2 is embedded in the flat plate 4, the transmitting plate and the receiving plate can be attached to each other at zero distance. At this point, if the car continues to move forward, the telescopic support rod and/or the swivel arm will be stretched, and the relative position of the transmitting plate and the receiving plate will not change.

In addition, as shown in FIG. 6 , the support member of the present invention can also adopt the following scheme: including a telescopic structure and a base 16 with a strip-shaped sliding groove 18, the two ends of the sliding groove 18 are provided with limit plates, and the telescopic structure is vertically arranged at In the middle of the sliding groove, the two sides are connected to the limit plates on the corresponding side through springs 19 and 20, so that the telescopic structure can automatically return to the center of the sliding groove when there is no external force. The telescopic structure is sleeved by the upper support arm 14. It is formed in the lower support arm 15, the upper end of the upper support arm 14 is connected with the first joint 7, and the bottom of the lower support arm is provided with a spring 17 to provide upward force to the upper support arm.

As shown in FIG. 7 , the transmitting component can also adopt the following scheme: it includes a wireless charging transmitting plate 1 , a shaft 22 and a third joint 21 , and the wireless charging transmitting plate 1 is connected with the bearing of the third joint 21 through the shaft 22 , so that it can be wound around The third joint 21 is free to rotate in the plane of the plate, and the third joint is used to connect with the support member, such as the upper end of the support rod 9 or the upper end of the upper support arm 14 . Several small rollers or balls can also be installed on the upper surface of the wireless charging and launching plate 1 to reduce the frictional force generated by the relative movement after it is close to the flat plate 4 .

FIG. 8 is a schematic diagram of another relative movement of the transmitting device and the receiving device. The launching device adopts the support member as shown in Figure 6. The launching plate can be rotated around the axis 22, can also be moved up and down through the telescopic structure, and can also slide freely in the sliding groove through the spring. When the launching plate enters the range of the flat plate , as the car continues to move forward, through the motion in the above-mentioned several degrees of freedom, the launch plate and the receiver plate will finally be aligned.

Claims (8)

1. a passive passive alignment device for wireless charging of electric vehicles, is characterized in that, comprises the transmitting device that is installed on the parking space ground and the receiving device that is installed on the vehicle chassis; The transmitting device includes a transmitting part and a supporting part, the transmitting part includes a wireless charging launching plate (1) and an outer wheel (6) arranged on the outer periphery of the wireless charging launching plate (1), and the outer wheel (6) can rotate around the launching plate to support The components include a support rod (9) and a horizontal rotating arm (11), the bottom of the wireless charging launch board (1) is connected to the upper end of the support rod (9) through a first joint (7), and the launch board can be wound around the support rod perpendicular to the support rod. The shaft rotates, one end of the rotating arm (11) is installed on the ground through the second joint (13) and can rotate in the horizontal plane around the second joint (13), the lower end of the support rod (9) is connected with the other end of the rotating arm (11), supporting The rod (9) is rotatable around its connecting end with the rotating arm in the vertical plane where the rotating arm (11) is located, and the first joint (7), the connecting end of the support rod (9) and the rotating arm (11), and The second joints (13) are all provided with return springs; The receiving device includes a flat plate (4), a wireless charging receiving plate (2), and a drum (5). The flat plate (4) is installed on the bottom of the vehicle, the drum (5) is horizontally positioned at the front end of the flat plate (4), and the The shaft is flush with the front bumper, the wireless charging receiving plate (2) is installed at the rear end of the upper surface of the flat plate (4), and the lower surface of the flat plate (4) is provided with guides along the periphery for restricting and guiding the movement of the launching plate (1) Fence (3). 2. The passive passive alignment device for wireless charging of electric vehicles according to claim 1, characterized in that, the flat plate (4) is gradually narrowed from the front end to the rear end, and the end is in a smooth arc shape, and the The charging receiving plate (2) is arranged at the rearmost end of the flat plate (4), and the edge of the arc section of the flat plate (4) overlaps with the edge of the receiving plate (2). 3 . The passive passive alignment device for wireless charging of electric vehicles according to claim 1 , wherein the wireless charging receiving plate ( 2 ) is embedded on the flat plate ( 4 ). 4 . 4 . The passive passive alignment device for wireless charging of electric vehicles according to claim 1 , wherein the roller ( 5 ) and the lower surface of the flat plate ( 4 ) have a smooth transition. 5 . 5 . The passive passive alignment device for wireless charging of electric vehicles according to claim 1 , wherein the support rod ( 9 ) and/or the rotating arm ( 11 ) are retractable structures. 6 . 6. The passive passive alignment device for wireless charging of electric vehicles according to claim 1, characterized in that, the support member adopts the following scheme: It includes a telescopic structure and a base (16) with a strip-shaped sliding groove (18), the two ends of the sliding groove (18) are provided with limit plates, and the telescopic structure is vertically arranged in the middle of the sliding groove. The limit plates are connected, and the telescopic structure is formed by the upper support arm (14) being sleeved in the lower support arm (15), and the upper end of the upper support arm (14) is connected with the first joint (7). 7. The passive passive alignment device for wireless charging of electric vehicles according to claim 1, characterized in that, the transmitting part adopts the following scheme: It includes a wireless charging launch board (1), a shaft (22) and a third joint (21). The wireless charging launch board (1) is connected to the bearing of the third joint (21) through the shaft (22), so that it can wrap around the third joint (21) Free rotation in the plane of the plate, and the third joint is used to connect with the support member. 8. The passive passive alignment device for wireless charging of electric vehicles according to claim 7, characterized in that, several rollers or balls are installed on the upper surface of the wireless charging launch plate (1).