A suspension damping device based on helmet fusion electric vehicle

Abstract

The application discloses a suspension damping device based on a helmet-fused electric vehicle, which comprises an upper suspension arc plate and a lower suspension arc plate, a bearing plate is fixedly installed on the lower suspension arc plate, a plurality of elastic support main rods are fixedly installed between the bearing plate and the upper suspension arc plate, a limiting mechanism is installed between the bearing plate and the upper suspension arc plate, a damping box is fixedly installed on the bearing plate, two electric telescopic rods are fixedly installed on the bearing plate, and driving ends of the two electric telescopic rods are jointly fixedly installed with lifting guide plates. The helmet of the driver of the electric vehicle can be matched with the suspension damping device, the total damping efficiency of the suspension damping device can be controlled according to the bumping degree of the driving road surface of the electric vehicle and by using the helmet, the damping adaptability is stronger, the intelligent degree is higher, and the vibration between the back seat and the rear wheel frame of the electric vehicle can be effectively reduced by using the absorption conversion, conduction and damping repulsion modes, and the damping effect is better.

Description

Technical Field

[0001] This invention relates to the technical field of intelligent shock absorption for electric vehicles, and more particularly to a suspension shock absorption device based on a helmet-integrated electric vehicle. Background Technology

[0002] Electric vehicles are portable power-assisted vehicles that use electricity as a driving source and convert electrical energy into mechanical energy through the cooperation of components such as controllers and motors. For safety reasons, drivers of electric vehicles must wear helmets to protect themselves when riding on bumpy roads.

[0003] To improve shock absorption, existing electric vehicles typically have a suspension damping device installed between the rear seat and the rear wheel frame. However, the shock absorption and energy absorption effects of existing suspension damping devices are constant and cannot be flexibly adjusted according to the actual driving conditions of the electric vehicle, resulting in poor shock absorption adaptability.

[0004] Existing suspension damping devices typically use elastic weakening and offsetting methods for damping. This method requires a long time to complete damping, cannot perform rapid damping under continuous vibration, and cannot convert and utilize vibration potential energy, resulting in some waste and limitations.

[0005] Therefore, there is an urgent need to design a suspension and shock absorption device based on a helmet-integrated electric vehicle to solve the above problems.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of constant shock absorption capacity, inflexibility and poor shock absorption effect under continuous vibration in the prior art, and to propose a suspension shock absorption device based on a helmet-integrated electric vehicle.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A suspension damping device based on a helmet-integrated electric vehicle includes an upper suspension plate and a lower suspension plate. A bearing plate is fixedly installed on the lower suspension plate, and multiple elastic support rods are fixedly installed between the bearing plate and the upper suspension plate. A limit mechanism is installed between the bearing plate and the upper suspension plate. A damping box is fixedly installed on the bearing plate. Two electric telescopic rods are fixedly installed on the bearing plate, and a lifting guide plate is fixedly installed on the drive end of the two electric telescopic rods. Multiple dampers are fixedly installed between the upper and lower suspension plates.

[0010] Multiple elastic support rods are fixedly installed between the lifting guide plate and the upper suspended arc plate. Multiple lifting guide rods are installed in the shock absorption box through multiple reset mechanisms. Each lifting guide rod is slidably connected to the bearing plate and the lower suspended arc plate. A vibration contact ball is fixedly installed at the lower part of each lifting guide rod. A partition plate is fixedly installed in the shock absorption box. A drive mechanism is installed between the multiple lifting guide rods and the partition plate.

[0011] The shock absorber box is equipped with a sliding plate installed through a sliding mechanism, and the space between the sliding plate and the partition plate is filled with damping fluid. A reciprocating spring rod is installed between the sliding plate and the shock absorber box. Two vibration guide rods that cooperate with the lifting guide plate are slidably installed between the sliding plate and the shock absorber box, and a transmission mechanism is installed between each vibration guide rod and the upper suspended arc plate.

[0012] In the aforementioned suspension and shock absorption device based on a helmet-integrated electric vehicle, the limiting mechanism includes two lower limiting frames fixedly installed on the bearing plate, and two upper limiting frames fixedly installed on the upper suspension arc plate, with each upper limiting frame cooperating with a corresponding lower limiting frame.

[0013] In the aforementioned suspension and shock absorption device for a helmet-integrated electric vehicle, both the upper and lower suspension arc plates are provided with multiple mounting holes for mounting in conjunction with the electric vehicle frame.

[0014] In the aforementioned suspension and shock absorption device based on a helmet-integrated electric vehicle, the reset mechanism includes two reset springs fixedly installed inside the shock absorber box. Each of the two reset springs is fixedly mounted with a connecting plate, and an insulating column is fixedly installed between the two connecting plates. The lifting guide rod is fixedly mounted on the insulating column.

[0015] In the aforementioned suspension and shock absorption device for a helmet-integrated electric vehicle, the drive mechanism includes an electric generating plate fixedly mounted on a partition plate. Multiple piezoelectric ceramic discs are fixedly mounted on the electric generating plate. Each insulating post is fixedly mounted with a collision ball, and each collision ball cooperates with a corresponding piezoelectric ceramic disc. A transmission structure is installed between the electric generating plate and the shock absorption box.

[0016] In the aforementioned suspension and shock absorption device for a helmet-integrated electric vehicle, the transmission structure includes two energy storage plates fixedly installed inside the shock absorption box, and transmission wires are fixedly installed between the two energy storage plates and the energy generation plate. Connecting wires are fixedly connected between the two energy storage plates and the corresponding electric telescopic rods. A controller is fixedly installed on the shock absorption box, and a monitoring and opening / closing device that cooperates with the controller is provided on the external helmet.

[0017] In the aforementioned suspension damping device for a helmet-integrated electric vehicle, the sliding mechanism includes two trapezoidal sliders fixedly mounted on a sliding plate, and two trapezoidal grooves are provided inside the damping box, with the two trapezoidal sliders respectively engaging and installed in the two trapezoidal grooves.

[0018] In the aforementioned suspension damping device for a helmet-integrated electric vehicle, the transmission mechanism includes a collision pressure bar fixedly mounted on the upper suspension plate. A damping magnetic block is fixedly mounted on the lower end of the collision pressure bar, and a damping disk is fixedly mounted on the upper part of the vibration guide rod. The magnetic poles of the damping disk and the damping magnetic block are the same on the side closest to each other.

[0019] Compared with existing technologies, the advantages of this invention are:

[0020] 1. This invention employs multiple elastic support main rods and elastic support secondary rods in combination, which can provide relatively stable elastic support between the upper and lower suspension arc plates and has strong shock absorption performance, effectively increasing the shock absorption effect between the rear seat and the rear wheel frame.

[0021] 2. This invention can transmit and convert the contact vibration between the lower suspension plate and the rear wheel frame, and use the ceramic piezoelectric collision power generation characteristics to convert the vibration potential energy into electrical energy for storage, which is more environmentally friendly, efficient and energy-saving.

[0022] 3. This invention can adjust the overall shock absorption efficiency between the upper and lower suspension plates according to the bumpiness of the road surface on which the electric vehicle is driven, and can be controlled by the monitoring and opening / closing device on the driver's helmet. This allows for flexible adjustment of the shock absorption performance based on the vibration amplitude, enabling adaptive shock absorption.

[0023] 4. This invention can initially weaken the vibration generated by the rear seat and the upper suspension plate through magnetic repulsion, and use the vibration potential energy to drive the damping fluid to flow back and forth. By utilizing the large energy consumption of the damping fluid flow resistance, the vibration reduction effect is better.

[0024] In summary, this invention can be used in conjunction with the helmet of an electric vehicle driver. It can control the overall shock absorption efficiency of the shock absorption device according to the bumpiness of the road surface on which the electric vehicle is traveling, resulting in stronger shock absorption adaptability and a higher degree of intelligence. Furthermore, by employing absorption, conversion, conduction, and damping mutual repulsion methods, it can effectively reduce the vibration between the rear seat and the rear wheel frame of the electric vehicle, resulting in better shock absorption. Attached Figure Description

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the suspension and shock absorption device based on a helmet-integrated electric vehicle proposed in this invention.

[0027] Figure 2 for Figure 1 Enlarged schematic diagram of the structure after rotation at a certain angle;

[0028] Figure 3 for Figure 1 Enlarged view of the upper and middle suspended arc plate, the load-bearing plate, and the connection structure between the two;

[0029] Figure 4 for Figure 3 Enlarged view of the lifting guide plate, the shock absorber box, and the connection structure between the two;

[0030] Figure 5 for Figure 4 Internal structural cross-sectional view;

[0031] Figure 6 for Figure 5 Enlarged view of the node at point A in the middle;

[0032] Figure 7 for Figure 5 Enlarged view of the connection structure between the middle lifting guide rod and its upper part.

[0033] In the diagram: 1 Upper suspended arc plate, 2 Bearing plate, 3 Lower suspended arc plate, 4 Mounting hole, 5 Elastic support main rod, 6 Lifting guide plate, 7 Shock absorber box, 8 Elastic support secondary rod, 9 Electric telescopic rod, 10 Lower limit frame, 11 Upper limit frame, 12 Vibration contact ball, 13 Lifting guide rod, 14 Vibration guide rod, 15 Collision pressure rod, 16 Damping disk, 17 Sliding plate, 18 Liquid guide tube, 19 Reciprocating spring rod, 20 Divider plate, 21 Damping liquid, 22 Electricity generating plate, 23 Insulating column, 24 Energy storage plate, 25 Connecting wire, 26 Return spring, 27 Collision ball, 28 Connecting plate, 29 Piezoelectric ceramic disk. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Reference Figures 1-3A suspension damping device based on a helmet-integrated electric vehicle includes an upper suspension arc plate 1 and a lower suspension arc plate 3. A bearing plate 2 is fixedly installed on the lower suspension arc plate 3. A damping box 7 is fixedly installed on the bearing plate 2. Two electric telescopic rods 9 are fixedly installed on the bearing plate 2, and a lifting guide plate 6 is fixedly installed on the drive end of the two electric telescopic rods 9. Multiple dampers are fixedly installed between the upper suspension arc plate 1 and the lower suspension arc plate 3.

[0037] The following points are worth noting:

[0038] A limiting mechanism is installed between the bearing plate 2 and the upper suspended arc plate 1. The limiting mechanism includes two lower limiting frames 10 fixedly installed on the bearing plate 2 and two upper limiting frames 11 fixedly installed on the upper suspended arc plate 1. Each upper limiting frame 11 cooperates with the corresponding lower limiting frame 10. The upper limiting frame 11 and the lower limiting frame 10 limit each other to limit the distance between the upper suspended arc plate 1 and the lower suspended arc plate 3, so as to avoid the distance between them being too large or too small and affecting the shock absorption effect.

[0039] Multiple elastic support main rods 5 are fixedly installed between the load-bearing plate 2 and the upper suspended arc plate 1, and multiple elastic support secondary rods 8 are fixedly installed between the lifting guide plate 6 and the upper suspended arc plate 1. This not only provides relatively stable elastic support between the upper suspended arc plate 1 and the lower suspended arc plate 3, but also has strong shock absorption performance, which can effectively increase the shock absorption effect between the rear seat and the rear wheel frame.

[0040] When the electric telescopic pole 9 is activated, it will cause the lifting guide plate 6 to move up and down, which will compress or stretch multiple elastic support main poles 5 and elastic support secondary poles 8, increase or decrease the length of the elastic support main poles 5 and elastic support secondary poles 8, thereby adjusting their shock absorption performance. This allows for real-time adjustment of the shock absorption performance according to the degree of road bumps, achieving targeted shock absorption.

[0041] Reference Figure 1 , Figures 4-7 Multiple lifting guide rods 13 are installed inside the shock absorber box 7 through multiple reset mechanisms, and each lifting guide rod 13 is slidably connected to the bearing plate 2 and the lower suspended arc plate 3. A vibration contact ball 12 is fixedly installed at the lower part of each lifting guide rod 13. A partition plate 20 is fixedly installed inside the shock absorber box 7, and a drive mechanism is installed between the multiple lifting guide rods 13 and the partition plate 20.

[0042] The following points are worth noting:

[0043] Both the upper suspension arc plate 1 and the lower suspension arc plate 3 are provided with multiple mounting holes 4 for mounting to the electric vehicle frame. The device is fixed to the electric vehicle's rear seat and rear wheel frame by the cooperation of the mounting holes 4 and the threaded bolts.

[0044] The reset mechanism includes two reset springs 26 fixedly installed inside the shock absorber box 7. A connecting plate 28 is fixedly installed on each of the two reset springs 26. An insulating column 23 is fixedly installed between the two connecting plates 28. The lifting guide rod 13 is fixedly installed on the insulating column 23. When the rear wheel frame of the electric vehicle vibrates, it will reciprocate in contact with multiple vibration contact balls 12. When the vibration contact balls 12 are vibrated, they will move up and down and cooperate with the reset springs 26 to drive the lifting guide rod 13 and the insulating column 23 to move up and down.

[0045] The driving mechanism includes an electric generating plate 22 fixedly installed on the partition plate 20. Multiple piezoelectric ceramic discs 29 are fixedly installed on the electric generating plate 22. Each insulating post 23 is fixedly installed with a collision ball 27, and each collision ball 27 cooperates with the corresponding piezoelectric ceramic disc 29. When the insulating post 23 rises, it will drive the collision ball 27 to rise and strike the piezoelectric ceramic disc 29, and cooperate with the electric generating plate 22 to generate electricity, thus converting vibration potential energy into electrical energy.

[0046] A transmission structure is installed between the power generation board 22 and the shock absorption box 7. The transmission structure includes two energy storage boards 24 fixedly installed inside the shock absorption box 7. Transmission wires are fixedly installed between the two energy storage boards 24 and the power generation board 22. Connecting wires 25 are fixedly connected between the two energy storage boards 24 and the corresponding electric telescopic rods 9. A controller is fixedly installed on the shock absorption box 7. A monitoring and opening / closing device that works with the controller is installed on the external helmet. The electrical energy generated by the power generation board 22 is conducted to the energy storage board 24 through the transmission wires for storage, which can increase the power for starting the electric telescopic rods 9.

[0047] The driver can monitor the amount of stored electrical energy through the monitoring and opening / closing device on the helmet, and use the monitoring and opening / closing device control controller to control the start and operation status of the electric telescopic pole 9 in real time according to the road bumps, so as to facilitate real-time adjustment of the shock absorption performance.

[0048] Reference Figures 3-5 A sliding plate 17 is installed inside the shock absorber box 7 via a sliding mechanism, and damping fluid 21 is filled between the sliding plate 17 and the partition plate 20. A reciprocating spring rod 19 is installed between the sliding plate 17 and the shock absorber box 7. Two vibration guide rods 14 that cooperate with the lifting guide plate 6 are slidably installed between the sliding plate 17 and the shock absorber box 7, and a transmission mechanism is installed between each vibration guide rod 14 and the upper suspended arc plate 1.

[0049] The following points are worth noting:

[0050] The sliding mechanism includes two trapezoidal sliders fixedly installed on the sliding plate 17. Two trapezoidal grooves are opened in the shock-absorbing box 7, and the two trapezoidal sliders are respectively engaged in the two trapezoidal grooves. The sliding mechanism is used to make the sliding plate 17 slide vertically only in the shock-absorbing box 7, without offsetting or separating from the shock-absorbing box 7.

[0051] The transmission mechanism includes a collision pressure rod 15 fixedly installed on the upper suspension arc plate 1. A damping magnetic block is fixedly installed at the lower end of the collision pressure rod 15. A damping disk 16 is fixedly installed on the upper part of the vibration guide rod 14. The magnetic poles of the damping disk 16 and the damping magnetic block are the same on the side closest to each other. When vibration occurs on the back seat of the electric vehicle, the vibration will drive the collision pressure rod 15 to move down through the upper suspension arc plate 1. The downward movement of the collision pressure rod 15 will drive the damping magnetic block to approach the damping disk 16, so that the magnetic repulsion between the two can be used for initial shock absorption.

[0052] If the vibration is large, the damping magnetic block will strike the damping disk 16, thereby squeezing the vibration guide rod 14 to move downward. When the vibration guide rod 14 moves downward, it will drive the sliding plate 17 to move downward in the vibration box 7 and squeeze the damping fluid 21. With the cooperation of the reciprocating spring rod 19, the vibration will be weakened and offset a second time by taking advantage of the high energy consumption characteristic of the damping fluid 21, thereby further improving the vibration reduction effect.

[0053] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0054] In this invention, the upper suspension plate 1 and the lower suspension plate 3 are first fixedly installed on the rear seat and the rear wheel frame of the electric vehicle by passing multiple threaded bolts through multiple mounting holes 4, thus completing the installation of this device;

[0055] When vibration occurs on the rear wheel frame of the electric vehicle, the vibration will cause multiple vibrating contact balls 12 to move up and down, and drive the lifting guide rod 13 and the insulating column 23 to move up and down, thereby causing multiple collision balls 27 to rise and strike the piezoelectric ceramic disk 29, and will work with the power generation plate 22 to generate electricity, thus converting the vibration potential energy into electrical energy, and storing it in the power storage plate 24 to provide power for the start of the electric telescopic rod 9.

[0056] The driver can monitor the amount of stored energy through the monitoring and opening / closing device on the helmet, and use the monitoring and opening / closing device to control the start and operation status of the electric telescopic pole 9 in real time according to the road bumps. This facilitates real-time adjustment of the shock absorption performance, increases or decreases the length of the elastic support main pole 5 and the elastic support secondary pole 8, thereby adjusting the shock absorption performance between the upper suspension arc plate 1 and the lower suspension guard plate. This allows for real-time adjustment of the shock absorption performance according to the degree of road bumps, achieving targeted shock absorption and increasing the shock absorption effect.

[0057] When vibration occurs on the back seat of the electric vehicle, the vibration will cause the collision pressure rod 15 to move down through the upper suspension arc plate 1. The downward movement of the collision pressure rod 15 will cause the damping magnetic block to move closer to the damping disk 16. The magnetic repulsion between the two can be used for initial vibration reduction. If the vibration is large, the damping magnetic block will collide with the damping disk 16, which will squeeze the vibration guide rod 14 to move down and cause the sliding plate 17 to move down in the vibration box 7 and squeeze the damping fluid 21. With the cooperation of the reciprocating spring rod 19, the vibration is weakened and canceled a second time by taking advantage of the high energy consumption characteristic of the damping fluid 21, which has high flow resistance, and further improves the vibration reduction effect.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A suspension damping device based on a helmet-integrated electric vehicle, comprising an upper suspension arc plate (1) and a lower suspension arc plate (3), characterized in that, A bearing plate (2) is fixedly installed on the lower suspended arc plate (3), and multiple elastic support rods (5) are fixedly installed between the bearing plate (2) and the upper suspended arc plate (1). A limit mechanism is installed between the bearing plate (2) and the upper suspended arc plate (1). A shock absorber box (7) is fixedly installed on the bearing plate (2). Two electric telescopic rods (9) are fixedly installed on the bearing plate (2), and a lifting guide plate (6) is fixedly installed on the drive end of the two electric telescopic rods (9). Multiple dampers are fixedly installed between the upper suspended arc plate (1) and the lower suspended arc plate (3). Multiple elastic support rods (8) are fixedly installed between the lifting guide plate (6) and the upper suspended arc plate (1). Multiple lifting guide rods (13) are installed in the shock absorption box (7) through multiple reset mechanisms. Each lifting guide rod (13) is slidably connected to the bearing plate (2) and the lower suspended arc plate (3). A vibration contact ball (12) is fixedly installed at the lower part of each lifting guide rod (13). A partition plate (20) is fixedly installed in the shock absorption box (7). A drive mechanism is installed between the multiple lifting guide rods (13) and the partition plate (20). The damping box (7) is equipped with a sliding plate (17) through a sliding mechanism, and the space between the sliding plate (17) and the partition plate (20) is filled with damping fluid (21). A reciprocating spring rod (19) is installed between the sliding plate (17) and the damping box (7). Two vibration guide rods (14) that cooperate with the lifting guide plate (6) are slidably installed between the sliding plate (17) and the damping box (7), and a transmission mechanism is installed between each vibration guide rod (14) and the upper suspended arc plate (1).

2. The suspension damping device based on a helmet-integrated electric vehicle according to claim 1, characterized in that, The limiting mechanism includes two lower limiting frames (10) fixedly installed on the bearing plate (2), and two upper limiting frames (11) fixedly installed on the upper suspended arc plate (1), and each upper limiting frame (11) cooperates with the corresponding lower limiting frame (10).

3. The suspension damping device based on a helmet-integrated electric vehicle according to claim 1, characterized in that, The upper suspended arc plate (1) and the lower suspended arc plate (3) are each provided with multiple mounting holes (4) for installation in conjunction with the electric vehicle frame.

4. The suspension damping device based on a helmet-integrated electric vehicle according to claim 1, characterized in that, The reset mechanism includes two reset springs (26) fixedly installed in the shock absorber box (7). Each of the two reset springs (26) is fixedly installed with a connecting plate (28). An insulating column (23) is fixedly installed between the two connecting plates (28), and the lifting guide rod (13) is fixedly installed on the insulating column (23).

5. A suspension damping device based on a helmet-integrated electric vehicle according to claim 4, characterized in that, The driving mechanism includes an electric generating plate (22) fixedly installed on a partition plate (20). Multiple piezoelectric ceramic discs (29) are fixedly installed on the electric generating plate (22). A collision ball (27) is fixedly installed on each insulating column (23), and each collision ball (27) cooperates with the corresponding piezoelectric ceramic disc (29). A transmission structure is installed between the electric generating plate (22) and the shock absorption box (7).

6. A suspension damping device for a helmet-integrated electric vehicle according to claim 5, characterized in that, The transmission structure includes two energy storage plates (24) fixedly installed inside the shock-absorbing box (7), and transmission wires are fixedly installed between the two energy storage plates (24) and the power generation plate (22). Connecting wires (25) are fixedly connected between the two energy storage plates (24) and the corresponding electric telescopic rods (9). A controller is fixedly installed on the shock-absorbing box (7), and a monitoring and opening / closing device that cooperates with the controller is provided on the external helmet.

7. A suspension damping device based on a helmet-integrated electric vehicle according to claim 1, characterized in that, The sliding mechanism includes two trapezoidal sliders fixedly installed on the sliding plate (17), and two trapezoidal grooves are opened in the shock-absorbing box (7), and the two trapezoidal sliders are respectively engaged and installed in the two trapezoidal grooves.

8. A suspension damping device for a helmet-integrated electric vehicle according to claim 1, characterized in that, The transmission mechanism includes a collision pressure rod (15) fixedly installed on the upper suspended arc plate (1). A damping magnetic block is fixedly installed at the lower end of the collision pressure rod (15), and a damping disk (16) is fixedly installed on the upper part of the vibration guide rod (14). The damping disk (16) and the damping magnetic block have the same magnetic pole on the side closest to each other.

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