Supporting assembly for electric vehicle, assembling method and balance car

Abstract

The embodiment of the invention relates to the technical field of electric vehicles, in particular to a supporting assembly for an electric vehicle, an assembling method and a balance car. The supporting assembly comprises a first tubular supporting shaft and a second tubular supporting shaft. The first tubular supporting shaft is hollow, and an arc-shaped hole is formed in the first end of the first tubular supporting shaft. The second tubular supporting shaft is arranged in a hollow mode and comprises a first shaft part and a second shaft part, and the second shaft part comprises a mounting hole and a fastener fixed to the mounting hole. An average radial dimension of the second shaft portion is smaller than an average radial dimension of the first shaft portion. At least a portion of the second shaft portion is configured to be rotatably inserted into the first end portion of the first tubular support shaft. The fastener is used for limiting the relative rotation angle of the first tubular supporting shaft and the second tubular supporting shaft and limiting the relative longitudinal displacement of the first tubular supporting shaft and the second tubular supporting shaft. Through the structure, the installation process is simplified, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to electric vehicle technology field, in particular to a kind of support assembly for electric vehicle, assembly method and balance car. BACKGROUND

[0002] With the strengthening of people's environmental awareness, the number of electric vehicles is increasing day by day. Two-wheeled electric balance car is a new type of vehicle, which is different from the arrangement of electric bicycle and motorcycle wheels, and adopts two-wheeled side-by-side fixed way. Balance car can realize the start, acceleration, deceleration, stop and other actions of vehicle only by changing the center of gravity of human body.

[0003] The inventor of the present application found that: at present, the balance car includes two balance bars, connecting rod, wheel set, the two ends of the connecting rod are connected with the two balance bars respectively, the two balance bars can rotate relative to the connecting rod, and the wheel set is installed on the two sides of the two balance bars away from the connecting rod. The structure of the split connecting rod and the balance bar is complex in production and assembly, and the installation efficiency is low. SUMMARY

[0004] The embodiment of the present application provides a kind of support assembly for electric vehicle, assembly method and balance car, which can improve the current split connecting rod and the structure of balance bar, the process is complex in production and assembly, and the installation efficiency is low.

[0005] To solve the above technical problems, one technical scheme adopted by the present application is to provide a support assembly for electric vehicle, characterized by comprising: a first tubular support shaft and a second tubular support shaft. The first tubular support shaft is hollow, and an arc-shaped hole is arranged at the first end portion of the first tubular support shaft, the arc-shaped hole comprising two laterally opposite side walls and two longitudinally opposite side walls. The second support shaft is hollow, comprising a first shaft portion having a first length and a second shaft portion integrally formed with the first shaft portion and having a second length smaller than the first length, the second shaft portion comprising a mounting hole and a fastener detachably fixed to the mounting hole. Wherein, the average radial dimension of the second shaft portion is smaller than the average radial dimension of the first shaft portion. Wherein, at least a portion of the second shaft portion is configured to be rotatably inserted into the first end portion of the first tubular support shaft. Wherein, the fastener is configured to movably and intermittently abut the two laterally opposite side walls to limit the angle of rotation of the first tubular support shaft and the second tubular support shaft relative to each other. Wherein, the fastener is further configured to movably and substantially continuously abut the two longitudinally opposite side walls to limit the longitudinal displacement of the first tubular support shaft and the second tubular support shaft relative to each other.

[0006] Optionally, the support assembly further comprises an auxiliary rotating member, the auxiliary rotating member is arranged between the second shaft portion and the first end portion; a gap is left between the second shaft portion and the first end portion, and the auxiliary rotating member is located at the gap.

[0007] Optionally, the auxiliary rotating member is provided with a clearance hole, the clearance hole is arranged corresponding to the mounting hole, and the fastener passes through the clearance hole and extends into the mounting hole.

[0008] Optionally, the diameter of the clearance hole is greater than or equal to the diameter of the mounting hole, and the diameter of the clearance hole is less than or equal to the diameter of the arc-shaped hole. The fastener comprises a first fastening portion and a second fastening portion, the first fastening portion is inserted into the arc-shaped hole, the second fastening portion is inserted into the mounting hole, the first fastening portion or the second fastening portion passes through the clearance hole, the diameter of the first fastening portion is greater than the diameter of the second fastening portion, the diameter of the first fastening portion is less than or equal to the diameter of the arc-shaped hole, and the diameter of the second fastening portion is less than or equal to the diameter of the mounting hole.

[0009] Optionally, the distance between the two laterally opposite side walls of the arc-shaped hole is between 5mm and 15mm, and the distance between the two longitudinally opposite side walls of the arc-shaped hole is between 10mm and 20mm.

[0010] Optionally, the distance between the arc-shaped hole and the end of the first end portion close to the second tubular support shaft is D1, when the fastener abuts against the arc-shaped hole, the fastener passes through the auxiliary rotating member, the length from the abutting position of the auxiliary rotating member and the fastener to the end of the auxiliary rotating member away from the second tubular support shaft is D2, and D1=D2.

[0011] Optionally, 20mm≤D1=D2≤25mm.

[0012] To solve the above technical problems, another technical solution adopted by the present application is to provide a method for assembling a support assembly of an electric vehicle, the method comprising: the support assembly comprising a first tubular support shaft and a second tubular support shaft that are inserted into each other; wherein the first tubular support shaft has a first end portion provided with an arc-shaped hole enclosed by two laterally opposite side walls and two longitudinally opposite side walls; the second tubular support shaft has a first shaft portion and a second shaft portion formed integrally, wherein the average radial dimension of the second shaft portion is smaller than the radial dimension of the first shaft portion, and the second shaft portion is provided with a mounting hole and a fastener detachably fixed to the mounting hole, the method comprising: aligning the first tubular support shaft and the second tubular support shaft axially relative to their end portions. The second tubular support shaft is configured to be obtained by a shrinkage process of the first shaft portion and the second shaft portion obtained by an integral forming process, the radial dimension of the first shaft portion being greater than the radial dimension of the second shaft portion and the axial dimension of the first shaft portion being greater than the axial dimension of the second shaft portion. The second shaft portion is movably inserted into the first end portion until the mounting hole is aligned with the arc-shaped hole. Then the fastener is fastened and mounted in the mounting hole through the arc-shaped hole. The fastener is configured to have a maximum diameter less than or equal to the distance between the two laterally opposite side walls of the arc-shaped hole. Wherein the fastener can rotate in the arc-shaped hole to limit the limit position of the relative rotation between the first tubular support shaft and the second tubular support shaft.

[0013] Optionally, the arc-shaped hole is configured to have the arc-shaped hole enclosed by two laterally opposite side walls and two longitudinally opposite side walls, wherein the distance between the two laterally opposite side walls is smaller than the distance between the two longitudinally opposite side walls.

[0014] Optionally, the mounting hole comprises a threaded hole, and the fastener comprises a screw, the screw being screwed with the threaded hole through the arc-shaped hole.

[0015] To solve the above technical problems, the application adopts another technical solution, which is to provide a support assembly for an electric vehicle, characterized by comprising a first elongated support member and a second elongated support member. The first elongated support member comprises a first end portion in a first tubular shape. The second elongated support member comprises a first portion having a first size in the length direction and a second portion in a second tubular shape integrally formed with the first portion, the second portion having a second size smaller than the first size in the length direction. The first end portion is rotationally connected to the second portion. The first tubular shape is different from the second tubular shape so that one of the first end portion and the second portion can be at least partially inserted into the other; one of the first end portion and the second portion has at least one slot, and the other has at least one protruding member. The at least one slot defines at least one active area, and the at least one protruding member is configured to be movable in the at least one active area to at least limit the angle of relative rotation between the first elongated support member and the second elongated support member.

[0016] Optionally, the radial size of the first portion is greater than the radial size of the second portion. The second elongated support member further comprises a third portion, one end of the third portion being connected to the first portion, and the radial size of the third portion at the connection with the first portion being equal to the radial size of the first portion. The other end of the third portion is connected to the second portion, and the radial size of the third portion at the connection with the second portion being equal to the radial size of the second portion. The first portion, the third portion, and the second portion are integrally formed, and the radial size of the third portion gradually decreases from the radial size of the first portion to the radial size of the second portion in the axial direction of the second elongated support member.

[0017] Optionally, the radial size of the first portion is equal to the radial size of the first end portion. The support assembly further comprises a first shaft sleeve movably sleeved on the second portion, and the sum of the radial size of the second portion and the axial thickness of the first shaft sleeve is less than or equal to the radial size of the first portion.

[0018] Optionally, the first portion has a radial dimension smaller than a radial dimension of the second portion. The second elongated support member further comprises a fourth portion, one end of the fourth portion is connected to the first portion, and the fourth portion has a radial dimension equal to the radial dimension of the first portion at the connection between the first portion and the fourth portion. The other end of the fourth portion is connected to the second portion, and the fourth portion has a radial dimension equal to the radial dimension of the second portion at the connection between the second portion and the fourth portion. The first portion, the fourth portion and the second portion are integrally formed, and the radial dimension of the fourth portion gradually increases from the radial dimension of the first portion to the radial dimension of the second portion along the axial direction of the second elongated support member.

[0019] Optionally, the first portion has a radial dimension equal to a radial dimension of the first end portion. The support assembly further comprises a second shaft sleeve movably sleeved on the first end portion, and the sum of the axial dimension of the first end portion and the axial thickness of the second shaft sleeve is less than or equal to the radial dimension of the second portion.

[0020] To solve the above technical problems, the application adopts still another technical scheme, which provides a balance car, comprising: a frame, a wheel set, a posture sensor, a driving device, a control module and the above support assembly. The wheel set is installed on the frame, the driving device is installed in the frame, the driving device drives the wheel set to rotate, the control module is installed in the frame, and the control module is electrically connected with the driving device. The support assembly is installed in the frame, and the wheel set is movably installed on both sides of the support assembly.

[0021] Optionally, the first tubular support shaft is provided with a first mounting groove, the first mounting groove is arranged on the side of the first tubular support shaft away from the second tubular support shaft, and the first mounting groove is arranged in a concave manner along the axial direction of the first tubular support shaft. The wheel set comprises a first wheel and a first driving shaft, one end of the first driving shaft is inserted into the first wheel, and the other end of the first driving shaft is inserted into the first mounting groove. The second tubular support shaft is provided with a second mounting groove, the second mounting groove is arranged on the side of the second tubular support shaft away from the first tubular support shaft, and the second mounting groove is arranged in a concave manner along the axial direction of the second tubular support shaft. The wheel set comprises a second wheel and a second driving shaft, one end of the second driving shaft is inserted into the second wheel, and the other end of the second driving shaft is inserted into the second mounting groove.

[0022] Optionally, the frame comprises a first frame body and a second frame body, the first frame body is wrappedly mounted on the first tubular support shaft, and the second frame body is wrappedly mounted on the second tubular support shaft. One of the first frame body and the second frame body is provided with a plug-in recess, and the other is provided with a plug-in protrusion, the first end portion extends from the plug-in recess or the plug-in protrusion, the second shaft portion extends from the other plug-in protrusion or the plug-in recess, and the plug-in protrusion and the plug-in recess are movably plugged The embodiment of the present application has the beneficial effect that, different from the prior art, the embodiment of the present application provides a support assembly for an electric vehicle, which comprises a first tubular support shaft and a second tubular support shaft. The first tubular support shaft is hollow, and a first end portion thereof is provided with an arc-shaped hole, the arc-shaped hole comprising two laterally opposite side walls and two longitudinally opposite side walls. The second tubular support shaft is hollow, and comprises a first shaft portion having a first length and a second shaft portion integrally formed with the first shaft portion and having a second length smaller than the first length, the second shaft portion comprising a mounting hole and a fastener detachably fixed to the mounting hole. The average radial dimension of the second shaft portion is smaller than the average radial dimension of the first shaft portion. At least a portion of the second shaft portion is configured to be rotatably inserted into the first end portion of the first tubular support shaft. The fastener is configured to movably and intermittently abut against the two laterally opposite side walls to limit the angle of rotation of the first tubular support shaft and the second tubular support shaft relative to each other. The fastener is further configured to movably and substantially continuously abut against the two longitudinally opposite side walls to limit the longitudinal displacement of the first tubular support shaft and the second tubular support shaft relative to each other. Through the above structure, at least a portion of the second shaft portion is configured to be rotatably inserted into the first end portion of the first tubular support shaft, thereby connecting the first tubular support shaft and the second tubular support shaft to be relatively rotatable, and the first shaft portion and the second shaft portion are integrally formed, thereby simplifying the installation process and improving the installation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0024] Figure 1 is a perspective view of a balance car provided by one of the embodiments of the present application; Figure 2 is an exploded view of a balance car provided by one of the embodiments of the present application; Figure 3 is an enlarged view of part A of Figure 2 Figure 4 is a perspective view of a support assembly according to an embodiment of the present application; Figure 5 is an enlarged view of part B of Figure 4 Figure 6 is a cross-sectional view of part C of Figure 4 Figure 7 is an enlarged view of part D of Figure 6 Figure 8 is a partial schematic view of a support assembly according to an embodiment of the present application; Figure 9 is a perspective view of a support assembly according to another embodiment of the present application; Figure 10 is an exploded view of a support assembly according to another embodiment of the present application; Figure 11 is a cross-sectional view of part E of Figure 9 Figure 12 is a perspective view of a support assembly according to yet another embodiment of the present application; Figure 13 is an exploded view of a support assembly according to yet another embodiment of the present application; Figure 14 is a partial cross-sectional schematic view of a support assembly according to yet another embodiment of the present application; Figure 15 is a partial cross-sectional schematic view of a support assembly according to still another embodiment of the present application; Figure 16 is a partial cross-sectional schematic view of a support assembly according to other embodiments of the present application; Figure 17 is a partial cross-sectional schematic view of a support assembly according to further embodiments of the present application; Figure 18 is an exploded schematic view of a support assembly according to other embodiments of the present application; Figure 19 is a schematic view of an assembly method of a support assembly according to an embodiment of the present application.

[0025] The reference signs are as follows: DETAILED DESCRIPTION

[0026] ​​​​​For the purpose of understanding the present application, the present application will be described in further detail below in connection with the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or one or more intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the present specification are used for the purpose of illustration only.

[0027] Unless otherwise defined, all technical and scientific terms used in the present specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the present specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the present specification and the appended claims, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] See Figure 1 and Figure 2respectively show a perspective view of the balance car 1000 provided by one of the embodiments of the present application and an exploded view of the balance car 1000 provided by one of the embodiments of the present application. The embodiments of the present application provide a balance car 1000, which comprises a support assembly 100, a frame 200, a wheel set 300, a posture sensor 400, a driving device 500 and a control module 600. The wheel set 300 is installed on the frame 200, the driving device 500 is installed in the frame 200, the driving device 500 drives the wheel set 300 to rotate, the control module 600 is installed in the frame 200, and the control module 600 is electrically connected with the driving device 500. The support assembly 100 is installed in the frame 200, and the wheel set 300 is movably installed on both sides of the support assembly 100. It should be noted that the frame 200 serves as the outer main body of the balance car 1000, which is used to accommodate the above-mentioned structures and protect the posture sensor 400, the driving device 500 and the control module 600 accommodated in the frame 200, and the support assembly 100 supports the frame 200 through the wheel set 300 arranged on both sides. The balance car 1000 carries a user and travels according to the user's posture. The user adjusts his / her posture to change the center of gravity, thereby triggering the posture sensor 400. Meanwhile, when the user adjusts the posture, the posture of the frame 200 also changes, so that the support assembly 100 can relatively rotate to control the rotating speed of the wheel set 300 on both sides of the support assembly 100. The posture sensor 400 transmits a posture signal to the control module 600, and the control module 600 controls the driving module to drive the wheel set 300 to rotate relative to the support assembly 100. It is worth mentioning that the support assembly 100 is installed in the frame 200, and the posture sensor 400 is installed in the frame 200 or on the support assembly 100. When the frames 200 on both sides relatively rotate, the support assemblies 100 on both sides relatively rotate, thereby triggering the posture sensor 400 to adjust the rotating speed and / or rotating direction of the wheel set 300 driven by the driving device 500. It can be understood that the embodiments of the present application do not limit the specific type of the posture sensor 400, the driving device 500 and the control module 600 Further, please refer to Figure 2and the other drawings. The first tubular support shaft 10 is provided with a first mounting slot 12, which is arranged on the side of the first tubular support shaft 10 away from the second tubular support shaft 20, and is arranged in a concave manner along the axial direction of the first tubular support shaft 10. The wheel set 300 comprises a first wheel 310 and a second driving shaft 340, one end of the second driving shaft 340 is inserted into the first wheel 310, and the other end of the second driving shaft 340 is inserted into the first mounting slot 12. The second tubular support shaft 20 is provided with a second mounting slot 23, which is arranged on the side of the second tubular support shaft 20 away from the first tubular support shaft 10, and is arranged in a concave manner along the axial direction of the second tubular support shaft 20. The wheel set 300 comprises a second wheel 330 and a second driving shaft 340, one end of the second driving shaft 340 is inserted into the second wheel 330, and the other end of the second driving shaft 340 is inserted into the second mounting slot 23. Specifically, the straight line along the axial direction of the first mounting slot 12 is arranged in a concave manner on the axial wall of the first tubular support shaft 10, and the number of the first mounting slots 12 is two, the two first mounting slots 12 are symmetrically arranged, and the second driving shaft 340 is inserted into the first mounting slot 12; correspondingly, the straight line along the axial direction of the second mounting slot 23 is arranged in a concave manner on the axial wall of the second tubular support shaft 20, and the number of the second mounting slots 23 is two, the two second mounting slots 23 are symmetrically arranged, and the second driving shaft 340 is inserted into the second mounting slot 23. In some other embodiments, the first mounting slot 12 and the second driving shaft 340 can be arranged in a structure of mutual clamping or mutual meshing; the second mounting slot 23 and the second driving shaft 340 can be arranged in a structure of mutual clamping or mutual meshing, that is, only the second driving shaft 340 needs to be mounted on the first tubular support shaft 10 through the first mounting slot 12, and the second driving shaft 340 needs to be mounted on the second tubular support shaft 20 through the second mounting slot 23. It is worth mentioning that the length and width of the first mounting slot 12 and the second mounting slot 23 are equal, wherein the length is 52mm and the width is 7mm.

[0029] For the foregoing frame 200, please refer to Figure 3 which shows the frame 200 provided by one embodiment of the present application Figure 2A part of A of FIG. 1. The frame 200 comprises a first frame body 210 and a second frame body 220, the first frame body 210 is wrapped on the first tubular support shaft 10, and the second frame body 220 is wrapped on the second tubular support shaft 20. One of the first frame body 210 and the second frame body 220 is provided with a plug-in recess 2210, and the other is provided with a plug-in protrusion 2110, the first end portion 11 extends from the plug-in recess 2210 or the plug-in protrusion 2110, and the second shaft portion 22 extends from the other plug-in protrusion 2110 or the plug-in recess 2210, the plug-in protrusion 2110 and the plug-in recess 2210 are movably plugged, and the first end portion 11 and the second end portion are movably plugged. Specifically, the first frame body 210 and the second frame body 220 are assembled in the form of upper and lower frame body buckling, the end portion of the first frame body 210 away from the first wheel 310 is provided with a concave arc-shaped plug-in recess 2210, and the end portion of the second frame body 220 away from the second wheel 330 is provided with a concave arc-shaped plug-in protrusion 2110; during installation, the upper and lower portions of the first frame body 210 can be buckled first, then the upper and lower portions of the second frame body 220 are buckled, and finally the first frame body 210 and the second frame body 220 are rotationally connected, or the lower half of the first frame body 210 and the second frame body 220 are rotationally connected first, then the upper half of the first frame body 210 and the second frame body 220 are rotationally connected, and finally the upper and lower portions of the first frame body 210 and the second frame body 220 are buckled. It can be understood that by providing the plug-in protrusion 2110 and the plug-in recess 2210 which are limited by mutual plug-in, the relative rotation between the first frame body 210 and the second frame body 220 is further limited, and the first frame body 210 and the second frame body 220 are prevented from being separated or excessively rotated.

[0030] For the foregoing support assembly 100, in some embodiments of the present application, please refer to Figure 4 and Figure 5 which respectively show a perspective view of a support assembly provided by an embodiment of the present application and a perspective view of a support assembly provided by an embodiment of the present application Figure 4The enlarged view of part B, in conjunction with other accompanying drawings, shows the support assembly 100 for electric vehicles. The support assembly 100 includes a first tubular support shaft 10 and a second tubular support shaft 20. The first tubular support shaft 10 is hollow, and its first end 11 is provided with an arc-shaped hole 111. The arc-shaped hole 111 includes two laterally opposed sidewalls 1111 and two longitudinally opposed sidewalls 1111. It should be noted that the arc-shaped hole 111 includes laterally opposed sidewalls 1111a and 1111b, where "lateral" refers to the circumferential direction of the first tubular support shaft 10; the arc-shaped hole 111 includes longitudinally opposed sidewalls 1111c and 1111d, where "longitudinal" refers to the axial direction of the first tubular support shaft 10; wherein the average distance between the laterally opposed sidewalls 1111a and 1111b is greater than the average distance between the longitudinally opposed sidewalls 1111c and 1111d. It should be noted that sidewalls 1111a, 1111b, 1111c, and 1111d all belong to sidewall 1111, and the letter markings after sidewall 1111 are only used to distinguish sidewalls 1111 with different installation directions. Please refer to the following for details. Figure 6, the second tubular support shaft 20 is hollow, comprising a first shaft portion 21 having a first length L1 and a second shaft portion 22 integrally formed with the first shaft portion 21 and having a second length L2 smaller than the first length L1, the second shaft portion 22 comprising a mounting hole 221 and a fastener 222 detachably fixed to the mounting hole 221. Wherein, the average radial dimension of the second shaft portion 22 is smaller than the average radial dimension of the first shaft portion 21. Wherein, at least a portion of the second shaft portion 22 is configured to be rotatably inserted into the first end portion 11 of the first tubular support shaft 10. Wherein, the fastener 222 is configured to movably and intermittently abut the laterally opposite side walls 1111a and 1111b to limit the angle of rotation of the first tubular support shaft 10 and the second tubular support shaft 20 relative to each other. Wherein, the fastener 222 is further configured to movably and substantially continuously abut the longitudinally opposite two side walls 1111c and 1111d to limit the longitudinal displacement of the first tubular support shaft 10 and the second tubular support shaft 20 relative to each other. It should be noted that the side walls 1111a, 1111b, 1111c and 1111d are connected by arc-shaped walls, and the openings of the arc-shaped holes 111 extend along the circumferential direction of the support shaft. The side walls 1111a, 1111b, 1111c and 1111d connected by arc-shaped walls make the opening edges of the arc-shaped holes 111 smooth and continuous, facilitating the movable cooperation of the fastener 222 with the arc-shaped holes 111. It should be noted that the second tubular support shaft 20 comprises a first shaft portion 21 having a first length L1 and a second shaft portion 22 integrally formed with the first shaft portion 21 and having a second length L2 smaller than the first length L1, which means that the second tubular support shaft 20 comprises a first shaft portion 21 and a second shaft portion 22, the first shaft portion 21 and the second shaft portion 22 are integrally formed, and the length of the first shaft portion 21 is greater than the length of the second shaft portion 22. The process of integrally forming the first shaft portion 21 and the second shaft portion 22 is a shrinkage process or pressure casting or other integrally forming process. The shrinkage process is a forming process in which the blank of the second tubular support shaft 20 is reduced in size by a necking die, and the connection between the first shaft portion 21 and the second shaft portion 22 is a continuous curve that changes the tube diameter from the first shaft portion 21 to the second shaft portion 22.It should be noted that the first length L1 refers to the distance between the end of the second tubular support shaft 20 close to the second wheel 330 and the end of the second tubular support shaft 20 which has not been changed in diameter by the pipe reducing process or die casting process, and correspondingly, the second length L2 refers to the distance between the end of the second tubular support shaft 20 away from the second wheel 330 and the end of the second tubular support shaft 20 which has been changed in diameter by the pipe reducing process. Optionally, in the embodiment of the present application, the ratio between the first length L1 and the second length L2 is 33:6, so as to leave more space for the first length L1 of the second tubular support shaft 20, facilitate the fixing of other components or parts of the balance car 1000 by using the space of the first length L1, improve the connection strength between the second tubular support shaft 20 and the first tubular support shaft 10, and improve the stability of the support assembly 100. In other embodiments, in order to improve the connection strength between the first tubular support shaft 10 and the second tubular support shaft 20, the ratio between the first length L1 and the second length L2 can also be any other ratio, for example: 5:1, 11:4, 5:2, 4:1, 3:1, or in order to expand the space of the second tubular support shaft 20 for fixing other components or parts, the ratio between the first length L1 and the second length L2 can also be any other ratio, for example: 6:1, 7:1, 7:2, or the like. It can be understood that by changing the ratio between the first length L1 and the second length L2, the first length L1 and the second length L2 of the second tubular support shaft 20 have different effects, and the total length of the second tubular support shaft 20 can be changed or unchanged. That is, in the balance car 1000 of the present application, on the one hand, the same size can be increased by increasing the ratio between the first length L1 and the second length L2, so that the second tubular support shaft 20 has a larger area for fixing other components or parts, or the ratio between the first length L1 and the second length L2 is reduced, so that the connection strength between the first tubular support shaft 10 and the second tubular support shaft 20 is improved, thereby improving the load capacity of the balance car 1000; on the other hand, the size of the balance car 1000 can be changed by directly changing the size of the second tubular support shaft 20 to change the ratio between the first length L1 and the second length L2, so as to adapt to different application scenarios, for example: a small size balance car 1000 can be used by children or small area patrol due to its short wheelbase, and a large size balance car can be used by adults or long distance cruising due to its long wheelbase.It is worth mentioning that the part of the second shaft portion 22 away from the first shaft portion 21 is provided with a mounting hole 221, and a fastener 222 passes through the arc-shaped hole 111 and is fixed to the mounting hole 221. Optionally, the fastener 222 includes a fastening structure such as a bolt, a stud, a screw, a pin, a welding pin, a rivet, a self-tapping screw, etc., and the mounting hole 221 is correspondingly provided as a mounting hole 221 matched with the above-mentioned structure to facilitate the fixation of the fastener 222. It still needs to be explained that the distance between the side wall 1111a and the side wall 1111b in the circumferential direction of the first tubular support shaft 10 is greater than the distance between the side wall 1111c and the side wall 1111d in the axial direction of the first tubular support shaft 10, so that the arc-shaped hole 111 is long and narrow as a whole. The movable and intermittent abutment of the above-mentioned fastener 222 with the laterally opposite side wall 1111a and the side wall 1111b means that when the fastener 222 moves / moves / rotates in the circumferential direction of the first tubular support shaft 10 in the arc-shaped hole 111, at most one of the side wall 1111a and the side wall 1111b is abutted, thereby limiting the rotation in the circumferential direction between the first tubular support 10 and the second tubular support shaft 20, and the distance between the side wall 1111a and the side wall 1111b in the circumferential direction of the first tubular support shaft 10 is much greater than the diameter of the fastener 222, so as to realize the movable and intermittent abutment of the fastener 222 with the laterally opposite side wall 1111a and the side wall 1111b, that is, when the fastener 222 abuts the side wall 1111a, it does not abut the side wall 1111b, or when the fastener 222 abuts the side wall 1111b, it does not abut the side wall 1111a, or when the fastener 222 is located between the side wall 1111a and the side wall 1111b, it does not abut the side wall 1111a and the side wall 1111b; correspondingly, the movable and substantially continuous abutment of the above-mentioned fastener 222 with the longitudinally opposite side wall 1111c and the side wall 1111d means that when the fastener 222 moves / moves / rotates in the circumferential direction of the first tubular support shaft 10 in the arc-shaped hole 111, the fastener 222 moves along the wall surface of the side wall 1111c or the side wall 1111d, and the diameter of the fastener 222 is slightly smaller than the straight-line distance between the side wall 1111c and the side wall 1111d, that is, a small gap is left between the side wall 1111c and the side wall 1111d, on the one hand to prevent the fastener 222 from being stuck between the side wall 1111c and the side wall 1111d, and on the other hand to prevent the fastener 222 from being unable to be installed between the side wall 1111c and the side wall 1111d due to manufacturing errors in the diameter of the fastener 222, thereby realizing the substantially continuous abutment of the fastener 222 with the side wall 1111c and the side wall 1111d to limit the axial movement of the first tubular support shaft 10 and the second tubular support shaft 20 and prevent the first tubular support shaft 10 and the second tubular support shaft 20 from being separated from each other.In summary, sidewalls 1111a, 1111b, 1111c, 1111d, and the aforementioned arc-shaped walls together form an arc-shaped hole 111 for the fastener 222 to move. The fastener 222 rotates circumferentially relative to the second tubular support shaft 20 within the arc-shaped hole 111. When the fastener 222 moves, it intermittently abuts against at most one of sidewalls 1111a and 1111b in the circumferential direction, thereby limiting the relative circumferential rotation angle between the first tubular support shaft 10 and the second tubular support shaft 20, for example, the relative rotation angle between the two is between 10° and 35°; it substantially continuously abuts against one of sidewalls 1111c or 1111d in the axial direction, thereby limiting the axial movement between the first tubular support shaft 10 and the second tubular support shaft 20. Optionally, in different embodiments, the rotation angle between the first tubular support shaft 10 and the second tubular support shaft 20 can be changed by altering the circumferential distance between the sidewalls 1111a and 1111b.

[0031] Further, please refer to Figure 6 and Figure 7 Each of these embodiments illustrates a provision provided in this application. Figure 4 The C-section view and one embodiment of this application provided Figure 6 The enlarged view of part D is shown in conjunction with other accompanying drawings. The support assembly 100 also includes an auxiliary rotating member 30, which is disposed between the second shaft portion 22 and the first end portion 11; a gap 40 is left between the second shaft portion 22 and the first end portion 11, and the auxiliary rotating member 30 is located at the gap 40. Optionally, the auxiliary rotating member 30 includes a bushing, a bearing shell, a sliding bearing, etc., wherein the bearing may include rolling elements such as an inner ring, steel balls, rollers, and needle rollers. By providing the auxiliary rotating member 30, the frictional force between the second shaft portion 22 and the first end portion 11 is reduced, thereby improving the efficiency of mutual rotation between the first tubular support member and the second tubular support member.

[0032] Optionally, please refer to Figure 8 The illustration shows a partial schematic diagram of a support assembly provided in one embodiment of this application, in conjunction with other accompanying drawings. In some other embodiments, the support assembly 100 may not include the auxiliary rotating member 30. That is, the auxiliary rotating member 30, such as the bushing, is directly integrally disposed at the end of the second shaft portion 22, thereby directly connecting the second shaft portion 22 and the first end portion 11 to facilitate relative rotation between the first tubular support shaft 10 and the second tubular support shaft 20. Alternatively, the surfaces of the auxiliary rotating member 30, the second shaft portion 22, and the first end portion 11 may be coated with a coating such as lubricating oil or a lubricating film to assist relative rotation between the second shaft portion 22 and the first end portion 11.

[0033] Furthermore, please continue reading Figure 7The auxiliary rotating member 30 is provided with a clearance hole 31, which corresponds to the mounting hole 221. The clearance hole 31 allows the fastener 222 to pass through the clearance hole 31 and extend into the mounting hole 221. In some other embodiments, the clearance hole 31 may be provided around the auxiliary rotating member 30, or the fastener 222 may be clamped between two auxiliary rotating members 30 to form the clearance hole 31. Correspondingly, in order to facilitate the installation and engagement of the auxiliary rotating member 30, a corresponding engagement structure is provided on the second shaft portion 22 and / or the first end portion 11 to facilitate the engagement of the auxiliary rotating member 30.

[0034] Alternatively, please continue reading Figure 7 Please refer to the accompanying drawings. There can be two clearance holes 31 and two mounting holes 221. The two clearance holes 31 are radially opposite to each other on both sides of the auxiliary rotating member 30, and the two mounting holes 221 are radially opposite to each other on both sides of the second shaft portion 22. This facilitates the installation and fixing of the fastener 222. That is, during installation, the fastener 222 has two sets of holes that can be used to fix it to the second shaft portion 22. In other embodiments, please refer to... Figure 9 to Figure 11 The diagrams show a perspective view of a support component 100 provided in another embodiment of this application, an exploded view of a support component 100 provided in another embodiment of this application, and a view of a support component 100 provided in another embodiment of this application. Figure 9 The cross-sectional view of plane E, in conjunction with other accompanying drawings. The number of clearance holes 31 and mounting holes 221 can be one, thereby increasing the strength of the tubular component itself and improving its support capacity by reducing the number of holes on the surfaces of the first tubular support 10, the second tubular support 20 and the auxiliary rotating component 30.

[0035] Optionally, please refer to Figure 12 to Figure 14 The diagrams show a perspective view, an exploded view, and a partial cross-sectional view of a support component provided in another embodiment of this application. It is understood that in this embodiment, the second shaft portion 22 has two mounting holes 221 arranged axially opposite each other, the auxiliary rotating member 30 has two clearance holes 31 arranged axially opposite each other, the first end portion 11 has two arc-shaped holes 111 arranged axially opposite each other, and the length of the fastener 222 is greater than the diameter of the aforementioned tube, so that the fastener can pass through the aforementioned tube. It is understood that both ends of the fastener 222 are exposed within the symmetrically arranged arc-shaped holes 111, so that the fastener 222 can more effectively restrict the axial and circumferential movement between the first tubular support member 10 and the second tubular support member 20.

[0036] Further optional, please refer to Figure 15Fig. 6 shows a partial cross-sectional view of a support assembly according to another embodiment of the present application. It can be understood that the number of fasteners 222 is two, and the fasteners 222 are inserted into the mounting hole 221 from the radially opposite arc-shaped holes 111. Thus, the axial and circumferential movement between the first tubular support 10 and the second tubular support 20 can be limited at both ends, and when one of them fails, the other can still limit the movement.

[0037] For the above-mentioned relief hole 31, please refer to Figure 7 and other drawings. The diameter of the relief hole 31 is greater than or equal to the diameter of the mounting hole 221, and the diameter of the relief hole 31 is less than or equal to the diameter of the arc-shaped hole 111. The fastener 222 includes a first fastening part 2221 and a second fastening part 2222, the first fastening part 2221 is inserted into the arc-shaped hole 111, and the second fastening part 2222 is inserted into the mounting hole 221. The first fastening part 2221 or the second fastening part 2222 passes through the relief hole 31. The diameter of the first fastening part 2221 is greater than the diameter of the second fastening part 2222, and the diameter of the first fastening part 2221 is less than or equal to the diameter of the arc-shaped hole 111. The diameter of the second fastening part 2222 is less than or equal to the diameter of the mounting hole 221. Through the above structure, the fastener 222 can be fixed in the mounting hole 221 without interference with the relief hole 31 and the arc-shaped hole 111, preventing the fastener 222 from affecting the relative rotation between the first tubular support 10 and the second tubular support 20.

[0038] For the above-mentioned arc-shaped hole 111, the distance between the transversely opposite side walls 1111a and 1111b is between 5mm and 15mm, and the distance between the longitudinally opposite side walls 1111c and 1111d is between 10mm and 20mm. It can be understood that the size of such arc-shaped hole 111 facilitates the selection of the size of the fastener 222, that is, according to the current national standard, there are more sizes of fasteners 222 that can be selected.

[0039] It should be noted that the distance between the arc-shaped hole 111 and the end of the first end portion 11 close to the second tubular support shaft 20 is D1, when the fastener 222 abuts against the arc-shaped hole 111, the fastener 222 passes through the auxiliary rotating member 30, the length of the abutting part of the auxiliary rotating member 30 and the fastener 222 away from the end of the second tubular support shaft 20 is D2, and D1=D2. Optionally, 20mm≤D1=D2≤25mm, or 18mm≤D1=D2≤27mm, or 15mm≤D1=D2≤30mm. It can be understood that, in the embodiment of the present application, 20mm≤D1=D2≤25mm, so that the auxiliary rotating member 30 can cover the entire area of the arc-shaped hole 111 to the first end portion 11 to facilitate the relative rotation of the first tubular support shaft 10 and the second tubular support shaft 20, and the sleeve with a length of 20mm to 25mm will not cause uneven stress on the sleeve due to its length, resulting in serious local wear, nor will it reduce the auxiliary rotating efficiency due to its short length. Optionally, D2 can also be slightly smaller than D1. It is worth mentioning that the thickness of the first tubular support shaft 10 and the second tubular support shaft 20 in the embodiment of the present application is 2mm, that is, the thickness of the hollow first tubular support shaft 10 and the hollow second tubular support shaft 20 is the same, and the diameter of the first tubular support shaft 10 and the second tubular support shaft 20 away from the connection part is also the same, that is, in the above-mentioned part of the same diameter, the outer diameter of the radial dimension of the first tubular support shaft 10 and the radial dimension of the second tubular support shaft 20 is 20mm, and the inner diameter is 16mm, and the thickness of the auxiliary rotating member 30 is 1mm. Through the above design, the auxiliary rotating member 30 is light and thin, thereby reducing the weight of the support assembly 100 and saving the cost of parts. Moreover, the auxiliary rotating member 30 is convenient for production and installation and disassembly, thereby improving the connection stability between the first tubular support shaft 10 and the second tubular support shaft 20. It can be understood that, considering that there may be errors in the size of each pipe during actual manufacturing, the thickness of the auxiliary rotating member 30 can also be a sleeve with a thickness of less than 1mm.

[0040] Please refer to Figure 16 and Figure 17Fig. 1 shows a partial cross-sectional view of a support assembly 100 according to an embodiment of the present application. Fig. 2 shows a partial cross-sectional view of a support assembly 100 according to another embodiment of the present application. Fig. 3 shows a partial cross-sectional view of a support assembly 100 according to yet another embodiment of the present application. The present application provides another embodiment, which provides a support assembly for an electric vehicle, comprising: a first elongated support member 10' and a second elongated support member 20'. The first elongated support member 10' comprises a first end portion 11' in a first tubular shape. The second elongated support member 20' comprises a first portion 21' having a first dimension L1' in a length direction and a second portion 22' in a second tubular shape integrally formed with the first portion 21', the second portion 22' having a second dimension L2' less than the first dimension L1' in the length direction. The first end portion 11' is rotatably connected to the second portion 22'. It is worth mentioning that the length direction of the second elongated support member 20' refers to the axial direction of the second elongated support member 20'. The first tubular shape is different from the second tubular shape so that one of the first end portion 11' and the second portion 22' can be at least partially inserted into the other; the one of the first end portion 11' and the second portion 22' has at least one slot 111', and the other of the first end portion 11' and the second portion 22' has at least one protrusion 221'. The at least one slot 111' defines at least one active region, and the at least one protrusion 221' is configured to be movable in the at least one active region to at least limit the angle of relative rotation between the first elongated support member 10' and the second elongated support member 20'. It is worth mentioning that the first elongated support member 10' and the second elongated support member 20' are both provided as hollow tubular support members, and the hollow structure facilitates the support members to bear force. In contrast, a solid rigid structure not only increases the weight but also easily causes brittle fracture of the support members and has a higher manufacturing cost. It is worth mentioning that in the present embodiment, the diameters of the first end portion 11' and the second portion 22' are different. Optionally, the diameter of the first end portion 11' is greater than the diameter of the second portion 22', or the diameter of the first end portion 11' is less than the diameter of the second portion 22'.The first end portion 11' or the second portion 22' is processed by a pipe reducing process or a pipe expanding process; alternatively, when the diameter of the first end portion 11' is equal to the diameter of the other portions of the first elongated support 10', the second portion 22' is processed by a pipe reducing process so that the diameter of the second portion 22' is smaller than the diameter of the first end portion 11', or the second portion 22' is processed by a pipe expanding process so that the diameter of the second portion 22' is larger than the diameter of the first end portion 11'; when the first end portion 11' is processed by a pipe reducing process so that the diameter of the first end portion 11' is smaller than the diameter of the other portions of the first elongated support 10', the diameter of the second portion 22' can be equal to the diameter of the first portion 21'; when the first end portion 11' is processed by a pipe expanding process so that the diameter of the first end portion 11' is larger than the diameter of the other portions of the first elongated support 10', the diameter of the second portion 22' can be equal to the diameter of the first portion 21'; alternatively, one of the first end portion 11' and the second portion 22' is processed by a pipe expanding process and the other is processed by a pipe reducing process so as to be adapted to each other. It can be understood that the diameter of the protrusion 221' is equal to or smaller than the minimum diameter of the active region so as to facilitate the protrusion 221' to slide along the slot 111' in the axial direction within the active region so as to limit the axial and circumferential movement between the first elongated support 10' and the second elongated support 20'. It can be understood that the pipe expanding process is another forming process relative to the pipe reducing process, and the pipe expanding process is a forming process of expanding the end of a pre-formed blank of the first elongated support 10' or the second elongated support 20' by an expanding die. It can be understood from the above embodiment that the first wheel 310 is installed at the end of the first elongated support 10' away from the second elongated support 20', and the second wheel 330 is installed at the end of the second elongated support 20' away from the first elongated support 10'. Figure 18, the first size L1' is greater than the second size L2', the first size L1' refers to the distance between the end of the second elongated support 20' close to the second wheel 330 and the end of the second elongated support 20' which has not been changed in pipe diameter by the pipe expanding process, the pipe reducing process or the die casting process; correspondingly, the second size L2' refers to the distance between the end of the second elongated support 20' away from the second wheel 330 and the end of the second elongated support 20' which has been changed in pipe diameter by the pipe expanding process or the pipe reducing process; optionally, in the embodiment of the present application, the ratio between the first size L1' and the second size L2' is 33:6, so as to leave more space for the first size L1' of the second elongated support 20' to fix other components or parts of the balance car 1000, improve the connection strength between the second elongated support 20' and the first elongated support 10', and improve the stability of the support assembly 100. In other embodiments, in order to improve the connection strength between the first elongated support 10' and the second elongated support 20', the ratio between the first size L1' and the second size L2' can also be any other ratio, for example: 11:4, 5:2, 4:1, 3:1, or in order to expand the space of the second elongated support 20' for fixing other components or parts, the ratio between the first size L1' and the second size L2' can also be any other ratio, for example: 6:1, 7:1, 7:2, etc. It can be understood that by changing the ratio between the first size L1' and the second size L2', the first size L1' and the second size L2' of the second elongated support 20' have different effects respectively, and the total length of the second elongated support 20' can be changed or unchanged, that is, in the balance car 1000 in the present application, on the one hand, the same size can be increased by increasing the ratio between the first size L1' and the second size L2' to make the second elongated support 20' have a larger area for fixing other components or parts, or the ratio between the first size L1' and the second size L2' can be reduced to improve the connection strength between the first elongated support 10' and the second elongated support 20', thereby improving the load capacity of the balance car 1000; on the other hand, the ratio between the first size L1' and the second size L2' can be changed by directly changing the size of the second elongated support 20', so that the size of the balance car 1000 can be changed to adapt to different application scenarios, for example: a small-size balance car 1000 can be used by children or for small-area patrol due to its short wheelbase, and a large-size balance car can be used by adults or for long-distance cruising due to its long wheelbase.

[0041] Please refer to Figure 16and in combination with other drawings. In some embodiments of the present application, the radial dimension of the first portion 21' is greater than the radial dimension of the second portion 22'. The second elongated support 20' further comprises a third portion 23', one end of the third portion 23' is connected to the first portion 21', and the radial dimension of the connection between the first portion 21' and the third portion 23' is equal to the radial dimension of the first portion 21'. The other end of the third portion 23' is connected to the second portion 22', and the radial dimension of the connection between the third portion 23' and the second portion 22' is equal to the radial dimension of the second portion 22'. Wherein, the first portion 21', the third portion 23' and the second portion 22' are integrally formed, and along the axial direction of the second elongated support 20', the radial dimension of the third portion 23' gradually decreases from the radial dimension of the first portion 21' to the radial dimension of the second portion 22'. Specifically, the first portion 21', the third portion 23' and the second portion 22' are arranged in sequence, and the third portion 23' is arranged as a smooth and continuous gradually decreasing structure, so as to facilitate the connection between the first portion 21' and the second portion 22'. The third portion 23' is a curved surface structure obtained by a pipe shrinking process or a pipe expanding process. In some embodiments, in order to improve the connection strength of the third portion 23', a reinforcing rib can be added in the pipe to improve the connection strength of the third portion 23'. That is, the third portion 23' is processed by the pipe shrinking process mentioned in the above embodiments.

[0042] Further, the radial dimension of the first portion 21' is equal to the radial dimension of the first end portion 11'. The support assembly further comprises a first shaft sleeve 30', the first shaft sleeve 30' is movably sleeved on the second portion 22', and the sum of the radial dimension of the second portion 22' and the axial thickness of the first shaft sleeve 30' is less than or equal to the radial dimension of the first portion 21'. Thus, a small gap is left, on the one hand, to prevent the parts of the first end portion 11', the first shaft sleeve 30' and the second portion 22' from being unable to be assembled due to errors in the manufacturing process, and on the other hand, to facilitate the relative rotation between the first end portion 11' and the second portion 22'.

[0043] Please refer to Figure 17and in combination with other drawings. In some embodiments of the present application, the radial dimension of the first portion 21' is smaller than the radial dimension of the second portion 22'. The second elongated support 20' further comprises a fourth portion 24', one end of the fourth portion 24' is connected to the first portion 21', and the radial dimension of the connection between the fourth portion 24' and the first portion 21' is equal to the radial dimension of the first portion 21'. The other end of the fourth portion 24' is connected to the second portion 22', and the radial dimension of the connection between the fourth portion 24' and the second portion 22' is equal to the radial dimension of the second portion 22'. Wherein, the first portion 21', the fourth portion 24' and the second portion 22' are integrally formed, and the radial dimension of the fourth portion 24' gradually increases from the radial dimension of the first portion 21' to the radial dimension of the second portion 22' along the axial direction of the second elongated support 20'. That is, the fourth portion 24' is processed by the pipe expanding process mentioned in the above embodiments.

[0044] Further, the radial dimension of the first portion 21' is equal to the radial dimension of the first end portion 11. The support assembly further comprises a second shaft sleeve 40', which is movably sleeved on the first end portion 11, and the sum of the axial dimension of the first end portion 11 and the axial thickness of the second shaft sleeve 40' is less than or equal to the radial dimension of the second portion 22'. Thus, a small gap is left, which on the one hand prevents the parts of the first end portion 11, the first shaft sleeve 30' and the second portion 22' from being unable to be assembled due to errors in the manufacturing process, and on the other hand facilitates the relative rotation between the first end portion 11 and the second portion 22'.

[0045] Please refer to Figure 19 which shows a schematic diagram of an assembly method of a support assembly 100 provided by an embodiment of the present application, and in combination with other drawings. In combination with the above embodiments, the assembly method of the above support assembly 100 is further described. The support assembly 100 comprises a first tubular support shaft 10 and a second tubular support shaft 20 which are inserted into each other; wherein the first tubular support shaft 10 has a first end portion 11 which is provided with an arc-shaped hole 111 which is enclosed by two transversely opposite side walls 1111 and two longitudinally opposite side walls 1111; the second tubular support shaft 20 has a first shaft portion 21 and a second shaft portion 22 which are integrally formed, wherein the average radial dimension of the second shaft portion 22 is smaller than the radial dimension of the first shaft portion 21, and the second shaft portion 22 is provided with a mounting hole 221 and a fastener 222 which is detachably fixed to the mounting hole 221, and the method comprises: S001: aligning the first tubular support shaft 10 and the second tubular support shaft 20 along the axial direction of the end portions thereof; S002: The second tubular support shaft 20 is configured to be integrally formed by a shrink tube process with the first shaft portion 21 and the second shaft portion 22, the first shaft portion 21 having a larger radial dimension than the second shaft portion 22 and a larger axial dimension than the second shaft portion 22; the second shaft portion 22 is movably inserted into the first end portion 11 until the mounting hole 221 is aligned with the arc-shaped hole 111; S003: The fastener 222 is fastened to the mounting hole 221 through the arc-shaped hole 111: S004: The fastener 222 is configured to have a maximum diameter that is less than or equal to the distance between the two laterally opposite side walls 1111 of the arc-shaped hole 111.

[0046] It is still to be noted that the fastener 222 is rotatable within the arc-shaped hole 111 to limit the limit positions of the relative rotation between the first tubular support shaft 10 and the second tubular support shaft 20.

[0047] Further, the arc-shaped hole 111 is configured to have two laterally opposite side walls 1111 and two longitudinally opposite side walls 1111 enclosed to form the arc-shaped hole 111, wherein the distance between the two laterally opposite side walls 1111 is less than the distance between the two longitudinally opposite side walls 1111.

[0048] Further, the mounting hole 221 comprises a threaded hole, and the fastener 222 comprises a screw, the screw being screwed into the threaded hole through the arc-shaped hole 111.

[0049] In the embodiments of the present application, a support assembly for an electric vehicle is provided, which comprises a first tubular support shaft 10 and a second tubular support shaft 20. The first tubular support shaft 10 is hollow, and a first end 11 of the first tubular support shaft 10 is provided with an arc-shaped hole 111, which comprises two laterally opposite side walls 1111 and two longitudinally opposite side walls 1111. The second tubular support shaft 20 is hollow, and comprises a first shaft portion 21 having a first length L1 and a second shaft portion 22 integrally formed with the first shaft portion 21 and having a second length L2 smaller than the first length L1, the second shaft portion 22 comprises a mounting hole 221 and a fastener 222 detachably fixed to the mounting hole 221. The average radial dimension of the second shaft portion 22 is smaller than the average radial dimension of the first shaft portion 21. At least a portion of the second shaft portion 22 is configured to be rotatably inserted into the first end 11 of the first tubular support shaft 10. The fastener 222 is configured to movably and intermittently abut against the two laterally opposite side walls 1111 to limit the angle of rotation of the first tubular support shaft 10 and the second tubular support shaft 20 relative to each other. The fastener 222 is further configured to movably and substantially continuously abut against the two longitudinally opposite side walls 1111 to limit the longitudinal displacement of the first tubular support shaft 10 and the second tubular support shaft 20 relative to each other. Through the above structure, at least a portion of the second shaft portion 22 is configured to be rotatably inserted into the first end 11 of the first tubular support shaft 10, so as to connect the first tubular support shaft 10 and the second tubular support shaft 20 in a rotatable manner. The first shaft portion 21 and the second shaft portion 22 are integrally formed, so as to simplify the installation process and improve the installation efficiency.

[0050] Based on the same inventive concept, the embodiments of the present application further provide a balance car, which comprises the above-mentioned support assembly, a vehicle frame, a wheel set, a posture sensor, a driving device and a control module. The wheel set is installed on the vehicle frame, the driving device is installed in the vehicle frame, the driving device drives the wheel set to rotate, and the control module is installed in the vehicle frame and electrically connected with the driving device. The support assembly is installed in the vehicle frame, and the wheel set is movably installed on both sides of the support assembly. For the structure and function of the support assembly, please refer to the above-mentioned embodiments, which will not be repeated here.

[0051] Based on the same inventive concept, the embodiments of the present application further provide a method for assembling a support assembly of an electric vehicle. For the assembly method, structure and function of the support assembly, please refer to the above-mentioned embodiments, which will not be repeated here.

[0052] It should be noted that the preferred embodiments of the present application are described in the specification and its attached drawings, but the present application can be implemented in many different forms and is not limited to the embodiments described in the specification, and these embodiments are not intended to be additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, each of the above technical features continues to combine to form various embodiments not listed above, which are considered to be within the scope of the present application specification; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes shall fall within the scope of protection of the claims of the present application.

Claims

1. A support assembly for electric vehicles, characterized in that, include: A hollow first tubular support shaft has an arc-shaped hole at its first end, the arc-shaped hole comprising two laterally opposed sidewalls and two longitudinally opposed sidewalls; and A hollow second tubular support shaft includes a first shaft portion having a first length and a second shaft portion integrally formed with the first shaft portion and having a second length less than the first length. The second shaft portion includes a mounting hole and a fastener detachably fixed to the mounting hole. Wherein, the average radial dimension of the second shaft portion is smaller than the average radial dimension of the first shaft portion; Wherein, at least a portion of the second shaft portion is configured to be rotatably inserted into the first end of the first tubular support shaft; The fastener is configured to movably and intermittently abut against the two laterally opposed sidewalls to limit the angle of rotation of the first tubular support shaft and the second tubular support shaft relative to each other. The fastener is also configured to movably and substantially continuously abut against the two longitudinally opposing sidewalls to limit longitudinal displacement of the first tubular support shaft and the second tubular support shaft relative to each other.

2. The support component according to claim 1, characterized in that, The support assembly further includes an auxiliary rotating component, which is disposed between the second shaft portion and the first end portion; a gap is left between the second shaft portion and the first end portion, and the auxiliary rotating component is located in the gap.

3. The support component according to claim 2, characterized in that, The auxiliary rotating component is provided with a clearance hole, which is corresponding to the mounting hole. The clearance hole is used to allow the fastener to pass through the clearance hole and extend into the mounting hole.

4. The support component according to claim 3, characterized in that, The diameter of the clearance hole is greater than or equal to the diameter of the mounting hole, and the diameter of the clearance hole is less than or equal to the diameter of the arc-shaped hole. The fastener includes a first fastening part and a second fastening part. The first fastening part is inserted into the arc-shaped hole, and the second fastening part is inserted into the mounting hole. Either the first fastening part or the second fastening part passes through the clearance hole. The diameter of the first fastening part is greater than the diameter of the second fastening part. The diameter of the first fastening part is less than or equal to the diameter of the arc-shaped hole, and the diameter of the second fastening part is less than or equal to the diameter of the mounting hole.

5. The support component according to claim 4, characterized in that, The distance between the two laterally opposite sidewalls of the arc-shaped hole is between 5 mm and 15 mm, and the distance between the two longitudinally opposite sidewalls of the arc-shaped hole is between 10 mm and 20 mm.

6. The support component according to claim 2, characterized in that, The distance between the arc-shaped hole and the end of the first end near the second tubular support shaft is D1. When the fastener abuts against the arc-shaped hole, the fastener passes through the auxiliary rotating member. The length between the abutment point of the auxiliary rotating member and the fastener and the end of the auxiliary rotating member away from the second tubular support shaft is D2, where D1=D2.

7. The support component according to claim 6, characterized in that, 20mm≤D1=D2≤25mm.

8. A method for assembling a support assembly for an electric vehicle, characterized in that, The support assembly includes a first tubular support shaft and a second tubular support shaft that are interlocked with each other; wherein, the first tubular support shaft has a first end, and the first end is provided with an arc-shaped hole formed by two laterally opposed sidewalls and two longitudinally opposed sidewalls; the second tubular support shaft has an integrally formed first shaft portion and a second shaft portion, wherein the average radial dimension of the second shaft portion is smaller than the radial dimension of the first shaft portion, and the second shaft portion is provided with a mounting hole and a fastener detachably fixed to the mounting hole, the method comprising: Align the first tubular support shaft and the second tubular support shaft axially with their ends facing each other; The second tubular support shaft is configured to be integrally formed by a tube shrinking process, wherein the radial dimension of the first shaft portion is greater than the radial dimension of the second shaft portion and the axial dimension of the first shaft portion is greater than the axial dimension of the second shaft portion; the second shaft portion is movably inserted into the first end until the mounting hole is aligned with the arc-shaped hole; The fastener is then passed through the arc-shaped hole and secured to the mounting hole. The fastener is configured such that its maximum diameter is less than or equal to the lateral distance between the two sidewalls of the arc-shaped hole; The fastener is rotatable within the arc-shaped hole to limit the extreme positions of relative rotation between the first tubular support shaft and the second tubular support shaft.

9. The method according to claim 8, characterized in that, The arc-shaped hole is configured to be formed by two laterally opposite sidewalls and two longitudinally opposite sidewalls, wherein the distance between the two laterally opposite sidewalls is less than the distance between the two longitudinally opposite sidewalls.

10. The method according to claim 8, characterized in that, The mounting hole includes a screw hole, and the fastener includes a screw that passes through the arc-shaped hole and is screwed into the screw hole.

11. A support assembly for an electric vehicle, characterized in that, include: A first elongated support member, which includes a first end portion in the form of a first tubular shape; The second slender support member includes a first portion having a first dimension in the length direction and a second tubular portion integrally formed with the first portion, the second portion having a second dimension in the length direction that is smaller than the first dimension; The first end is rotatably connected to the second part; The first tubular shape is different from the second tubular shape so that one of the first end and the second portion can be at least partially inserted into the other; wherein one of the first end and the second portion has at least one slot, and the other of the first end and the second portion has at least one protrusion; The at least one slot defines at least one active area, and the at least one protrusion is configured to be movable within the at least one active area to at least limit the angle of relative rotation of the first elongated support and the second elongated support.

12. The support component according to claim 11, characterized in that, The radial dimension of the first part is larger than the radial dimension of the second part; The second elongated support member further includes a third part, one end of which is connected to the first part, and the radial dimension of the connection between the third part and the first part is equal to the radial dimension of the first part; The other end of the third part is connected to the second part, and the radial dimension at the connection between the third part and the second part is equal to the radial dimension of the second part; The first part, the third part, and the second part are integrally formed, and along the axial direction of the second slender support member, the radial dimension of the third part gradually decreases from the radial dimension of the first part to the radial dimension of the second part.

13. The support component according to claim 12, characterized in that, The radial dimension of the first portion is equal to the radial dimension of the first end; The support assembly further includes a first bushing that is movably fitted onto the second part, wherein the sum of the radial dimension of the second part and the axial thickness of the first bushing is less than or equal to the radial dimension of the first part.

14. The support component according to claim 11, characterized in that, The radial dimension of the first part is smaller than the radial dimension of the second part; The second slender support also includes a fourth part, one end of which is connected to the first part, and the radial dimension of the connection between the fourth part and the first part is equal to the radial dimension of the first part; The other end of the fourth part is connected to the second part, and the radial dimension at the connection between the fourth part and the second part is equal to the radial dimension of the second part; The first part, the fourth part, and the second part are integrally formed, and along the axial direction of the second slender support member, the radial dimension of the fourth part gradually increases from the radial dimension of the first part to the radial dimension of the second part.

15. The support component according to claim 13, characterized in that, The radial dimension of the first portion is equal to the radial dimension of the first end; The support assembly further includes a second bushing, which is movably fitted onto the first end, wherein the sum of the axial dimension of the first end and the axial thickness of the second bushing is less than or equal to the radial dimension of the second portion.

16. A self-balancing scooter, characterized in that, include: The vehicle includes a frame, wheelset, attitude sensor, drive unit, and control module. The wheelset is mounted on the frame, the drive unit is installed inside the frame and drives the wheelset to rotate, and the control module is installed inside the frame and electrically connected to the drive unit. It also includes a support assembly as described in any one of claims 1-7, the support assembly being installed within the frame, and the wheelset being movably installed on both sides of the support assembly.

17. The self-balancing scooter according to claim 16, characterized in that, The first tubular support shaft is provided with a first mounting groove, which is located on the side of the first tubular support shaft away from the second tubular support shaft. The first mounting groove is recessed inward along the axial direction relative to the first tubular support shaft. The wheel set includes a first wheel and a first drive shaft. One end of the first drive shaft is inserted into the first wheel, and the other end of the first drive shaft is inserted into the first mounting groove. The second tubular support shaft is provided with a second mounting groove, which is located on the side of the second tubular support shaft away from the first tubular support shaft. The second mounting groove is recessed inward relative to the second tubular support shaft along the axial direction. The wheel set includes a second wheel and a second drive shaft. One end of the second drive shaft is inserted into the second wheel, and the other end of the second drive shaft is inserted into the second mounting groove.

18. The self-balancing scooter according to claim 16, characterized in that, The frame includes a first frame and a second frame, the first frame being mounted on the first tubular support shaft, and the second frame being mounted on the second tubular support shaft; In this configuration, one of the first frame and the second frame is provided with a insertion recess, and the other is provided with a insertion protrusion. The first end extends from the insertion recess or the insertion protrusion, and the second shaft extends from the other insertion protrusion or the insertion recess. The insertion protrusion and the insertion recess are movably inserted, and the first end and the second end are movably inserted.

Images