Electric two-wheeled vehicle

Abstract

The invention discloses an electric two-wheeled vehicle. The electric two-wheeled vehicle comprises a vehicle frame, a power battery, a driving motor and a walking mechanism. At least part of the power battery is connected with the frame, the driving motor is electrically connected with the power battery, and the walking mechanism is in transmission connection with the driving motor. The frame comprises a front frame body and a rear frame body which are split, the front frame body is arranged on the front side of the power battery and fixed to the power battery, and the rear frame body is arranged on the rear side of the power battery and fixed to the power battery; the driving motor is installed on the power battery and located on the side, facing the rear frame, of the power battery, a reference plane perpendicular to the height direction of the electric two-wheeled vehicle is defined, and the projection, in the height direction, of the driving motor on the reference plane is overlapped with the projection, in the height direction, of the power battery on the reference plane. Through the arrangement, the integration of the driving motor and the power battery is higher, the assembling efficiency of the battery is improved, and the weight of the whole vehicle is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle engineering, in particular to an electric two-wheeled vehicle. BACKGROUND

[0002] The electric two-wheeled vehicle is a kind of electric vehicle, which is powered by power battery to make driving motor work, and further includes speed control device for controlling driving motor, and other devices of the electric two-wheeled vehicle are basically the same as those of motorcycle driven by internal combustion engine.

[0003] The frame of the existing electric two-wheeled vehicle basically follows the frame form of motorcycle driven by internal combustion engine, and power battery and driving motor are installed on the frame, but due to the larger volume of power battery and driving motor compared with internal combustion engine, the frame needs to be structurally reinforced, which leads to the increase of the weight of the whole vehicle. SUMMARY

[0004] In order to solve the problems in the prior art, the present application aims to provide an electric two-wheeled vehicle with compact structure and light weight.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0006] An electric two-wheeled vehicle includes a frame, a power battery, a driving motor and a walking mechanism, the power battery includes a battery pack shell, the battery pack shell is at least partially connected with the frame; the driving motor is electrically connected with the power battery; the walking mechanism is in transmission connection with the driving motor; the frame includes a split front frame and a rear frame, the front frame is arranged at the front side of the power battery and is fixedly connected with the battery pack shell, the rear frame is arranged at the rear side of the power battery and is fixedly connected with the battery pack shell; the driving motor is installed on the side of the power battery facing the rear frame and is fixedly connected with the battery pack shell, a reference plane perpendicular to the height direction of the electric two-wheeled vehicle is defined, and the projection of the driving motor on the reference plane along the height direction partially overlaps the projection of the power battery on the reference plane along the height direction.

[0007] Further, the side of the battery pack shell facing the rear frame is recessed inward to form an avoiding space, and at least part of the driving motor is arranged in the avoiding space.

[0008] Further, the walking mechanism includes a front wheel and a rear wheel, and the distance between the wheel shaft center of the front wheel and the wheel shaft center of the rear wheel is defined as a first distance when viewed from the width direction of the electric two-wheeled vehicle, and the distance between the frontmost end of the power battery and the rearmost end of the driving motor along the length direction of the electric two-wheeled vehicle is defined as a second distance, and the ratio between the first distance and the second distance is greater than or equal to 0.47 and less than or equal to 0.57.

[0009] Further, the battery pack shell comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are distributed at the outer edge of the battery pack shell, and the first connecting portion is located at the front side of the second connecting portion, the front frame is fixedly connected with the battery pack shell through the first connecting portion, and the rear frame is fixedly connected with the battery pack shell through the second connecting portion.

[0010] Further, the battery pack shell is made of aluminum alloy material.

[0011] Further, the frame comprises a motor connecting support arranged between the power battery and the driving motor, and the driving motor is fixedly connected with the battery pack shell through the motor connecting support.

[0012] Further, the maximum distance of the motor connecting support distributed in the width direction of the electric two-wheeled vehicle is defined as a first width, and the maximum distance of the power battery distributed in the width direction of the electric two-wheeled vehicle is defined as a second width, and the ratio of the first width to the second width is greater than or equal to 0.6 and less than or equal to 0.8.

[0013] Further, the motor connecting support comprises a first connecting plate and a second connecting plate distributed in the width direction of the electric two-wheeled vehicle, and the first connecting plate and the second connecting plate are distributed on the left and right sides of the driving motor and are limited in the width direction.

[0014] Further, the first connecting plate and the second connecting plate are provided with motor connecting portions on the side facing the driving motor, and the first connecting plate and the second connecting plate are connected with the driving motor through the motor connecting portions and fasteners.

[0015] Further, the battery pack shell comprises a fixing structure protruding towards the side of the driving motor, and the fixing structure is distributed on the left and right sides of the motor connecting support and is limited in the width direction of the electric two-wheeled vehicle.

[0016] Further, the motor connecting support further comprises a sleeve and a fixing member, the sleeve is installed between the first connecting plate and the second connecting plate, the two ends of the sleeve are respectively abutted with the first connecting plate and the second connecting plate, and the fixing member passes through the fixing structure, the first connecting plate, the sleeve and the second connecting plate to fixedly connect the motor connecting support with the battery pack shell.

[0017] In the present application, the driving motor of the electric two-wheeled vehicle is installed on the power battery, and the driving motor is located at the rear side of the battery pack shell, and from the height direction, the driving battery and the power battery partially overlap, so that the whole components formed by the driving motor and the power battery are more compact. In addition, since the driving motor is installed on the power battery, the frame does not need to bear the weight of the driving motor, so the frame structure does not need to be strengthened, so that the overall weight of the vehicle is lighter. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of an electric two-wheeled vehicle according to an embodiment of the present application;

[0019] Figure 2 Fig. 2 is a schematic diagram of a partial structure of an electric two-wheeled vehicle according to an embodiment of the present application;

[0020] Figure 3 Fig. 3 is a schematic diagram of a power battery and a drive motor according to an embodiment of the present application;

[0021] Figure 4 Fig. 4 is an exploded view of a power battery and a drive motor according to an embodiment of the present application;

[0022] Figure 5 Fig. 5 is a top view of a power battery and a drive motor according to an embodiment of the present application;

[0023] Figure 6 Fig. 6 is a schematic diagram of a connection structure of a middle frame according to an embodiment of the present application;

[0024] Figure 7 Fig. 7 is an enlarged view of A in Fig. 6 according to an embodiment of the present application; Figure 6

[0025] Figure 8 Fig. 8 is a schematic diagram of a connection between a power battery and a suspension according to an embodiment of the present application;

[0026] Figure 9 Fig. 9 is an exploded view of an adapter support and a power battery according to an embodiment of the present application;

[0027] Figure 10 Fig. 10 is an enlarged view of B in Fig. 6 according to an embodiment of the present application; Figure 9

[0028] Figure 11 Fig. 11 is an enlarged view of C in Fig. 6 according to an embodiment of the present application; Figure 9

[0029] Figure 12 Fig. 12 is a sectional view of a power battery according to an embodiment of the present application;

[0030] Figure 13 Fig. 13 is a side view of a power battery and a suspension according to an embodiment of the present application;

[0031] Figure 14 Fig. 14 is a schematic diagram of a footrest assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the personnel in the art better understand the present application, the technical solutions in the specific embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0033] ​​​The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. "First", "second", "third", "fourth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or an indicated number of technical features. Thus, features defined with "first", "second", "third", "fourth" can explicitly or implicitly include at least one of the features. The singular forms "a", "an" and "the" used in this application and the appended claims are intended to include plural forms as well, unless the context clearly indicates otherwise.

[0034] As shown in Figure 1 , the application provides an electric two-wheeled vehicle 100, which includes basic components of the vehicle, such as a frame 10, a suspension 20, a walking mechanism 30, a power battery 40 and a driving motor 50. The frame 10 constitutes the main frame of the electric two-wheeled vehicle 100, and the walking mechanism 30 is connected to the frame 10 through the suspension 20. The power battery 40 is installed on the frame 10, and the power battery 40 is electrically connected with the driving motor 50 to provide energy for the driving motor 50. The driving motor 50 is installed on the power battery 40 or the frame 10, and the driving motor 50 is in transmission connection with the walking mechanism 30 to transmit power to the walking mechanism 30 and drive the electric two-wheeled vehicle 100 to move. In order to clearly illustrate the technical solutions of the application, the upward, downward, leftward, rightward, forward and backward directions as shown in Figure 1 are defined.

[0035] It should be noted that the "length direction" of the electric two-wheeled vehicle 100 mentioned below refers to the front-to-back direction of the electric two-wheeled vehicle 100 in the state as shown in Figure 1 , the "width direction" of the electric two-wheeled vehicle 100 refers to the left-to-right direction of the electric two-wheeled vehicle 100 in the state as shown in Figure 1 , and the "height direction" of the electric two-wheeled vehicle 100 refers to the upward-to-downward direction of the electric two-wheeled vehicle 100 in the state as shown in Figure 1

[0036] As shown in Figure 2 and Figure 3 , as an implementation manner, the frame 10 includes a split front frame 11 and a rear frame 12, the power battery 40 includes a battery pack shell 41, the front frame 11 is arranged at the front side of the power battery 40 and is fixedly connected with the battery pack shell 41, the rear frame 12 is arranged at the rear side of the power battery 40 and is fixedly connected with the battery pack shell 41, and the front frame 11 and the rear frame 12 are connected through the battery pack shell 41. In this arrangement, the battery pack shell 41, as a part of the frame, bears the load, saves the frame originally located in the middle of the vehicle, and is more lightweight. At the same time, the power battery 40 does not need to be arranged in the space surrounded by the irregular frame, and the utilization rate of the space in the middle of the vehicle is higher. ​

[0037] In the assembling process of the power battery 40, the power battery 40 is connected with the front frame 11 and the rear frame 12 respectively, and the vehicle frame 10 does not interfere with the power battery 40, thereby improving the convenience of assembling the power battery 40 to the vehicle frame 10. Compared with the existing assembling process, since the vehicle frame 10 is an integral component, the space surrounded by the vehicle frame 10 is relatively compact, and the space for adjusting the position of the battery during the installation of the motor is small, which leads to the difficulty of the battery installation process.

[0038] Specifically, the driving motor 50 is installed on the side of the power battery 40 facing the rear frame 12 and is fixedly connected with the battery pack shell 41. A reference plane 101 perpendicular to the height direction of the electric two-wheeled vehicle 100 is defined, the projection of the driving motor 50 on the reference plane 101 in the height direction is defined as the motor projection, the projection of the power battery 40 on the reference plane 101 in the height direction is defined as the battery projection, and the motor projection and the battery projection at least partially overlap.

[0039] Exemplarily, as viewed from the width direction of the electric two-wheeled vehicle 100, the shape of the battery pack shell 41 is substantially "U"-shaped, and the opening of the battery pack shell 41 faces the rear side of the electric two-wheeled vehicle 100. The driving motor 50 enters the area surrounded by the driving motor 50 along the opening and is fixed in the area.

[0040] In the electric two-wheeled vehicle 100, the driving motor and the power battery occupy a relatively large vehicle arrangement space, which is not conducive to the arrangement of other components and systems except the driving motor and the power battery, and on the other hand, under the limitation of the overall vehicle wheelbase, it is difficult to increase the battery to obtain higher endurance.

[0041] In the example of the present application, the side of the battery pack shell 41 facing the rear frame 12 is recessed inward to form an avoidance space 401, and at least part of the driving motor 50 is arranged in the avoidance space 401. Wherein, the inward recess of the power battery 40 means that the power battery 40 is recessed towards the center of the space surrounded by the battery pack shell 41, so as to form the avoidance space 401 outside the space surrounded by the battery pack shell 41.

[0042] The battery pack shell 41 comprises a first connecting portion 411 and a second connecting portion 412, the first connecting portion 411 and the second connecting portion 412 are distributed on the outer edge of the battery pack shell 41, and the first connecting portion 411 is located in front of the second connecting portion 412. The front frame 11 is fixedly connected with the battery pack shell 41 through the first connecting portion 411, and the rear frame 12 is fixedly connected with the battery pack shell 41 through the second connecting portion 412. The battery pack shell 41 is made of metal material, and the battery pack shell 41 can be made of aluminum alloy.

[0043] By the above arrangement, the space occupied by the drive motor 50 and the power battery 40 in the length direction of the electric two-wheeled vehicle 100 is reduced, and in the case of a limited wheelbase, the volume of the power battery 40 can be appropriately increased to improve the vehicle's endurance. In addition, compared with the conventional frame form, the structure of the frame 10 and the power battery 40 can minimize the overall weight of the vehicle and improve the vehicle's handling.

[0044] As shown in Figure 2 , the walking mechanism 30 includes front wheels 31 and rear wheels 32. The distance between the wheel shaft center of the front wheels 31 and the wheel shaft center of the rear wheels 32, as viewed in the width direction of the electric two-wheeled vehicle 100, is defined as a first distance D1, which can be understood as the wheelbase of the vehicle. When the drive motor 50 is connected to the power battery 40, the distance between the last end of the drive motor 50 and the front end of the power battery 40, distributed in the length direction of the electric two-wheeled vehicle 100, is defined as a second distance D2. As an implementation, the ratio between the second distance D2 and the first distance D1 is greater than or equal to 0.47 and less than or equal to 0.57. Further, the ratio between the second distance D2 and the first distance D1 is greater than or equal to 0.5 and less than or equal to 0.55. More preferably, the ratio between the second distance D2 and the first distance D1 is equal to 0.52. It should be noted that if the ratio between the second distance D2 and the first distance D1 is too large, the arrangement space occupied by the drive motor 50 and the power battery 40 in the length direction of the electric two-wheeled vehicle 100 is large, which is not conducive to vehicle assembly. If the ratio between the second distance D2 and the first distance D1 is reduced by increasing the wheelbase, it may result in an increase in the overall cost of the vehicle, and the frame 10 after increasing the wheelbase cannot adapt to the existing overall vehicle platform, resulting in poor universality. If the ratio between the second distance D2 and the first distance D1 is too small, it may result in a small volume of the power battery 40, affecting the vehicle's endurance. Therefore, the above implementation can improve the convenience of vehicle assembly while ensuring the vehicle's endurance as much as possible.

[0045] As shown in Figure 3 , as an implementation, the frame 10 further includes a motor connecting bracket 13, which is arranged between the drive motor 50 and the power battery 40. The drive motor 50 is connected to the battery pack shell 41 through the motor connecting bracket 13 and remains relatively fixed with the battery pack shell 41.

[0046] It should be noted that compared with the integral frame, the overall strength of the frame 10 composed of the split front frame 11 and the rear frame 12 is lower. If the drive motor 50 is installed on the rear frame 12, the structural strength of the rear frame 12 needs to be strengthened, resulting in an increase in the overall weight of the frame 10. The drive motor 50 is installed on the power battery 40 through the motor connecting bracket 13, thereby reducing the load of the rear frame 12 and reducing the cost of the frame 10.

[0047] In the example of the present application, the motor connecting bracket 13 is made of aluminum alloy material, so that the motor connecting bracket 13 has high structural strength while reducing the weight of the whole vehicle.

[0048] From the width direction of the electric two-wheeled vehicle 100, the motor connecting bracket 13 is basically arc-shaped, and since the outer contour of the drive motor 50 is basically arc-shaped, the motor connecting bracket 13 can be arranged at the outer edge of the drive motor 50. It can be understood that since there are many wire harnesses and controllers arranged on both sides of the drive motor 50, and enough space is needed on the left side or right side of the drive motor 50 for the transmission assembly (not shown in the figure) arranged between the drive motor 50 and the walking mechanism 30. Therefore, the motor connecting bracket 13 arranged along the outer edge of the drive assembly can avoid interference with the peripheral components of the drive motor 50.

[0049] As shown in Figure 3 Further, the battery pack shell 41 includes a fixing structure 413 arranged on the side of the battery pack shell 41 facing the drive motor 50, and the battery pack shell 41 is fixedly connected with the motor connecting bracket 13 through the fixing structure 413.

[0050] For example, the fixing structure 413 can be a protrusion extending from the battery pack shell 41 to the side of the drive motor 50, and when the motor connecting bracket 13 is connected with the power battery 40, the motor connecting bracket 13 is arranged between the left and right two fixing structures 413, and the motor connecting bracket 13 is limited in the width direction of the electric two-wheeled vehicle 100 by the left and right two fixing structures 413.

[0051] As shown in Figure 4 Specifically, the motor connecting bracket 13 includes a first connecting plate 131 and a second connecting plate 132 distributed in the width direction of the electric two-wheeled vehicle 100, and the first connecting plate 131 and the second connecting plate 132 are distributed on the left and right sides of the drive motor 50 to clamp the drive motor 50, and the drive motor 50 is limited in the width direction by the left and right distributed first connecting plate 131 and second connecting plate 132.

[0052] The side of the first connecting plate 131 and the second connecting plate 132 facing the drive motor 50 is provided with a motor connecting portion 133, and the motor connecting portion 133 is provided with a plurality of through holes, and the side of the drive motor 50 facing the first connecting plate 131 and / or the second connecting plate 132 has through holes matched with the motor connecting portion 133, and the fastener passes through the first connecting plate 131 and the drive motor 50, so that the first connecting plate 131 is relatively fixed with the drive motor 50, and the fastener passes through the second connecting plate 132 and the drive motor 50, so that the second connecting plate 132 is relatively fixed with the drive motor 50.

[0053] The motor connection bracket 13 also includes a sleeve 134 and a fastener 135. The sleeve 134 is installed between the first connecting plate 131 and the second connecting plate 132, with both ends of the sleeve 134 abutting against the first connecting plate 131 and the second connecting plate 132, respectively. The fastener 135 passes through the fixing structure 413, the first connecting plate 131, the sleeve 134, and the second connecting plate 134. When the fastener 135 passes through the first connecting plate 131, the sleeve 134, and the second connecting plate 134, the motor connection bracket 13 is fixedly connected to the battery pack housing 41. When the motor connecting bracket 13 is connected to the battery pack housing 41, the sleeve 134 applies a first-direction force to the first connecting plate 131 and the second connecting plate 132 located at both ends of the sleeve (the first direction refers to the direction from the sleeve 134 to the first connecting plate 131, or the direction from the sleeve 134 to the second connecting plate 132). The fixing structure 413 applies a second-direction force to the first connecting plate 131 and the second connecting plate 132, wherein the first direction is opposite to the second direction, thereby avoiding excessive pre-tightening of the fixing member 135 that would cause deformation of the first connecting plate 131 and / or the second connecting plate 132.

[0054] In the example of this application, the number of motor connection parts 133 is set to two, and the two motor connection parts 133 are respectively connected to the first connecting plate 131 and the connecting plate 132. The same component as the sleeve 134 is also provided between the two motor connection parts 133, thereby avoiding the risk of deformation of the motor connection parts 133 due to the force applied by the fastener.

[0055] like Figure 5 As shown, the maximum distance of the motor connecting bracket 13 distributed in the width direction of the electric two-wheeler 100 is defined as the first width D3, and the maximum distance of the power battery 40 distributed in the width direction of the electric two-wheeler 100 is defined as the second width D4. As one implementation, the ratio between the first width D3 and the second width D4 is greater than or equal to 0.6 and less than or equal to 0.8. Further, the ratio between the first width D3 and the second width D4 is greater than or equal to 0.65 and less than or equal to 0.75. More preferably, the ratio between the first width D3 and the second width D4 is equal to 0.7. It should be noted that if the ratio between the first width D3 and the second width D4 is too large, the width of the fixing structure 413 that fixes the motor connecting bracket 13 may be too narrow, affecting the stability of the connection between the drive motor 50 and the power battery 40. If the ratio between the first width D3 and the second width D4 is too small, the stability of the connection between the motor connecting bracket 13 and the drive motor 50 is weak, causing the motor connecting bracket 13 to be unable to withstand excessive stress, thus affecting the stability of the connection between the drive motor 50 and the power battery 40. The above settings ensure the stability of the connection between the drive motor 50 and the power battery 40 without requiring significant adjustments to the overall width of the vehicle.

[0056] likeFigure 6 As an implementation, the vehicle frame 10 further comprises a middle frame 14 for reinforcing the structural strength of the front frame 11 and the rear frame 12, the middle frame 14 is distributed on the left and right sides of the power battery 40, and the front and rear ends of the middle frame 14 are fixedly connected with the front frame 11 and the rear frame 12 respectively.

[0057] Further, the middle frame 14 is detachably arranged between the front frame 11 and the rear frame 12. Since the middle frame 14 is distributed on the left and right sides of the power battery 40, the independently detachable middle frame 14 can make the power battery 40 have better maintainability.

[0058] Specifically, the rear frame 12 comprises a rear main frame 121 and a rear auxiliary frame 122 connected with the rear main frame 121, the rear main frame 121 is fixedly connected with the power battery 40 and is distributed on the left and right sides of the motor connecting bracket 13, and the rear main frame 121 is arranged between the power battery 40 and the rear auxiliary frame 122.

[0059] The power battery 40 has an end surface for connecting the rear frame 12, the end surface is the rear side of the power battery 40, at least part of the rear auxiliary frame 122 is connected to the lower part of the end surface through the rear main frame 121, and at least part of the rear auxiliary frame 122 is also connected to the upper part of the end surface, the rear auxiliary frame 122 extends to the rear of the electric two-wheeled vehicle 100 and is used for supporting the seat of the electric two-wheeled vehicle 100.

[0060] It can be predicted that the rear main frame 121 distributed on the left and right sides of the motor connecting bracket 13 can avoid the exposure of the driving motor 50 and the motor connecting bracket 13, and reduce the risk of damage of the driving motor 50 while ensuring the connection strength of the rear frame 12 and the power battery 40.

[0061] In the example of the present application, one end of the middle frame 14 is fixedly connected with the front frame 11, and the other end of the middle frame 14 is fixedly connected with the rear main frame 121. The middle frame 14 is formed by welding aluminum alloy pipes, which can ensure a high structural strength while reducing the weight of the whole vehicle, thereby bringing better handling performance.

[0062] In the specific assembly process, the driving motor 50 is connected with the motor connecting bracket 13, and the end of the motor connecting bracket 13 away from the driving motor 50 is fixedly connected with the power battery 40, so as to complete the assembly between the driving motor 50 and the power battery 40. Further, the front frame 11 and the rear auxiliary frame 122 are respectively arranged on the front and rear sides of the power battery 40, and then the rear main frame 121 is fixedly arranged on the left and right sides of the motor connecting bracket 13, and the rear main frame 121 is fixedly connected with the power battery 40 and the rear auxiliary frame 122, so as to form the main body contour of the electric two-wheeled vehicle 100. The middle frame 14 is arranged on the left and right sides of the power battery 40 and is fixed with the front frame 11 and the rear main frame 121. Through the above assembly sequence, when the power battery 40 needs to be maintained, only the middle frames 14 on the two sides need to be disassembled, and the main body of the electric two-wheeled vehicle 100 will not be structurally affected, and the convenience of maintaining the power battery 40 is improved.

[0063] As shown in Figure 6 , as an optional implementation manner, the angle a between the extension direction of the middle frame 14 and the reference plane 101 is greater than or equal to 0° and less than or equal to 90°. Through the inclined arrangement of the middle frame 14, the structural stability of the frame 10 composed of the split front frame 11 and the rear frame 12 is further improved.

[0064] Further, the middle frame 14 includes a plurality of inclined tubular members 141, and the shape of the tubular members 141 is not specifically limited, which can be a round pipe, a square pipe or the like, and is flexibly arranged according to the width of the whole vehicle or the assembly space. The tubular members 141 are welded to form a support, so as to facilitate the assembly and disassembly of the middle frame 14.

[0065] The rear main frame 121 distributed on the left and right sides of the driving motor 50 connecting bracket 13 can avoid the exposure of the driving motor 50 and the motor connecting bracket 13. It can be predicted that the rear main frame 121 basically covers the avoidance space 401 in the left and right directions, and since the middle frame 14 is connected with the rear main frame 121, the length of the middle frame 14 can be shortened, and the weight and cost of the whole vehicle are reduced.

[0066] As shown in Figure 7 , as an implementation manner, the middle frame 14 includes a plurality of middle frame mounting portions 142, and the middle frame 14 is connected with the front frame 11 and the rear main frame 121 through the plurality of middle frame mounting portions 142. From the width direction of the electric two-wheeled vehicle 100, the plurality of middle frame mounting portions 142 are distributed at the edges of the battery pack shell 41.

[0067] In the example of the present application, the middle frame 14 is connected with the front frame 11 and the rear main frame 121 through the middle frame mounting portion 142 respectively, so as to avoid setting corresponding mounting points on the power battery 40. When the middle frame 14 is disassembled, the stability of the frame 10 and the power battery 40 as a whole is not affected.

[0068] Specifically, the front frame 11 includes a first fixing portion 111 and a second fixing portion 121, both of which are located at one end of the front frame 11 close to the battery pack shell 41. The front frame 11 is fixedly connected with the battery pack shell 41 through the first fixing portion 111, and when the front frame 11 is connected with the middle frame 14, the second fixing portion 121 corresponds to the middle frame mounting portion 142.

[0069] It should be noted that during the installation process of the frame 10, multiple components may share one mounting point, i.e., one bolt is continuously threaded through multiple components to reduce the number of component openings and the number of bolts used. The above-mentioned first fixing portion 111 and second fixing portion 121 indicate that the front frame 11 has at least two non-coincident mounting points that do not interfere with each other, so as to avoid affecting the connection between the front frame 11 and the power battery 40 when the middle frame 14 is disassembled.

[0070] As shown in Figure 6 , for example, the power battery 40 further includes a battery pack side cover 43 arranged on the battery pack shell 41, the battery pack side cover 43 is arranged on at least one side of the left and right sides of the battery pack shell 41, and the second fixing portion 121 avoids the battery pack side cover 43 in the width direction of the electric two-wheeled vehicle 100.

[0071] The second fixing portion 121 avoiding the battery pack side cover 43 in the width direction can be that the second fixing portion 121 has a certain gap with the battery pack side cover 43 in the width direction, or the second fixing portion 121 extends upwards and forwards of the power battery 40 to avoid the power battery 40. Through the above arrangement, the battery pack side cover 43 can be disassembled from the battery pack shell 41.

[0072] As shown in Figure 8 and Figure 9 , as an implementation manner, the suspension 20 includes a rear swing arm 21 and a rear shock absorber 22 connected with the rear swing arm 21, the rear shock absorber 22 is specifically used for absorbing vibration transmitted by the rear swing arm 21, so as to improve the stability during vehicle travel. The suspension 20 further includes an adapter bracket 23, one end of the rear shock absorber 22 is movably connected with the rear swing arm 21, and the other end is connected to the power battery 40 through the adapter bracket 23, wherein the rear shock absorber 22 is movably connected with the adapter bracket 23, and the adapter bracket 23 limits the rear shock absorber 22 in the width direction of the electric two-wheeled vehicle 100.

[0073] Specifically, the adapter bracket 23 is a metal forging, which is used to absorb the stress between the rear shock absorber 22 and the power battery 40, so as to avoid the deformation of the battery package shell 41 of the power battery 40.

[0074] In the example of the present application, since the driving motor 50 is fixedly connected with the power battery 40 and located at the rear of the power battery 40, in order to avoid the interference between the rear shock absorber 22 and the driving motor 50 during the installation process or when the rear shock absorber 22 is shortened or elongated along its own axial direction, the power battery 40 includes a bracket connecting structure 44 for fixing the adapter bracket 23, which is arranged above the driving motor 50 and the avoiding space 401, so as to form an included angle between the axis of the rear shock absorber 22 and the horizontal plane.

[0075] As shown in Figure 10 and Figure 11 , as an implementation manner, the bracket connecting structure 44 forms a receiving groove 441 for arranging the adapter bracket 23, and the opening of the receiving groove 441 faces the rear side of the power battery 40. From the height direction of the electric two-wheeled vehicle 100, the receiving groove 441 is basically in the shape of “U”, so that the adapter bracket 23 can be embedded in the bracket connecting structure 44. When the adapter bracket 23 is embedded in the receiving groove 441, at least part of the bracket connecting structure 44 on both sides of the receiving groove 441 limits the adapter bracket 23 in the width direction of the electric two-wheeled vehicle 100. In this way, the sliding of the rear shock absorber 22 in the width direction is avoided, and the stability of the vehicle during driving is improved.

[0076] Specifically, the adapter bracket 23 includes a bracket body (not shown in the figure), a first mounting portion 231 and a second mounting portion 232. The bracket body includes two plate members opposite in the width direction of the electric two-wheeled vehicle 100, the first mounting portion 231 is a connecting pipe arranged in the width direction of the electric two-wheeled vehicle 100, and the first mounting portion 231 connects the two plate members. The structures and connection modes of the two plate members are basically the same, and only one of them and its connection mode will be described below. The second mounting portion 232 is a through hole arranged on the plate member, the first mounting portion 231 and the second mounting portion 232 are distributed in the up-down direction, and the number of the second mounting portion 232 is two, and the first mounting portion 231 is located between the adjacent two second mounting portions 232. Among them, the adapter bracket 23 is movably connected with the rear shock absorber 22 through the first mounting portion 231, and the adapter bracket 23 is fixedly connected with the bracket connecting structure 44 through the second mounting portion 232. When the bracket body and the receiving groove 441 abut, it is a surface contact, which can avoid the stress concentration of the contact points between the adapter bracket 23 and the bracket connecting structure 44, and further cause the damage of the adapter bracket 23 and the bracket connecting structure 44. At the same time, the smoothness of the connection between the rear shock absorber 22 and the power battery 40 is improved.

[0077] In the assembly process of the rear shock absorber 22 and the power battery 40, the rear shock absorber 22 is connected with the adapter bracket 23, and a fastener is sequentially passed through the first mounting portion 231 and the rear shock absorber 22 in the width direction, so that the rear shock absorber 22 can rotate relative to the adapter bracket 23 around the axis of the fastener. Then, the adapter bracket 23 is embedded into the accommodating groove 441 formed by the bracket connecting structure 44, and another fastener is sequentially passed through the second mounting portion 232 and the adapter bracket 23 in the width direction, so that the adapter bracket 23 and the second mounting portion 232 are relatively fixed.

[0078] In the examples of the present application, since the power battery 40 bears part of the function of the frame 10, if a corresponding frame 10 cross beam is arranged on the rear frame 12, the cost and weight of the frame 10 may be increased. Through the above arrangement, not only the material of the frame 10 is saved, but also the design of the frame 10 cross beam is avoided, the force applied by the rear shock absorber 22 is borne by the power battery 40, and based on the cooperation between the adapter bracket 23 and the power battery 40, the stress borne by the power battery 40 is effectively reduced.

[0079] Further, the adapter bracket 23 includes at least two second mounting portions 232 distributed from top to bottom, and the second mounting portions 232 are distributed on the upper and lower sides of the first mounting portion 231, so as to ensure that the power battery 40 bears uniform stress. It can be predicted that the second mounting portions 232 distributed on the upper and lower sides of the first mounting portion 231 can effectively disperse the load on either side of the first mounting portion 231, and avoid relative sliding between the adapter bracket 23 and the bracket connecting structure 44.

[0080] Optionally, since the rear shock absorber 22 forms an included angle with the horizontal plane, the force applied by the rear shock absorber 22 on the adapter bracket 23 is uneven. According to the distribution of the force applied by the rear shock absorber 22 on the adapter bracket 23, the number of second mounting portions 232 on the upper and lower sides of the first mounting portion 231 can be flexibly adjusted.

[0081] If the adapter bracket 23 above the first mounting portion 231 needs to bear a larger load, the number of second mounting portions 232 above the first mounting portion 231 is greater than the number of second mounting portions 232 below the first mounting portion 231, and vice versa.

[0082] More specifically, the bracket connection structure 44 includes a mating portion 442 that engages with the bracket body. The mating portion 442 is a protrusion extending from the power battery 40 toward the rear shock absorber 22. The mating portion 442 has a channel penetrating through itself along the width direction of the electric two-wheeler 100, the number of which corresponds to the number of the second mounting portion 232. A clearance area 443 is formed between the two channels. Understandably, since the first mounting portion 231 and the rear shock absorber 22 are connected by a fastener 4422, the clearance area 443 can prevent interference between the fastener 4422 and between the first mounting portion 231 and the mating portion 442.

[0083] For example, the clearance area 443 is specifically configured to be recessed towards the front of the power battery 40.

[0084] As one implementation, a bushing 4421 is provided in the channel, and a fastener 4422 passes through the bushing 4421 and the second mounting part 232 of the adapter bracket 23. The bushing 4421 is made of steel to increase the hardness of the bushing 4421 and prevent the battery pack shell 41 of the power battery 40 from being worn.

[0085] Specifically, the bushing 4421 is fitted onto the fastener 4422 and can rotate relative to the fastener 4422 about the axis of the fastener 4422. In addition, the bushing 4421 also has a clearance fit with the inner wall of the channel.

[0086] With the above arrangement, the bushing 4421 can move relative to the mating part 442 in the width direction of the electric two-wheeler 100, and absorb the gap between the adapter bracket 23 and the bracket connection structure 44 during the pre-tightening process of the fastener 4422.

[0087] like Figure 13 As shown, in one implementation, the suspension 20 also includes a rocker arm shaft 24 for connecting the rear rocker arm 21 to the frame 10. The rocker arm shaft 24 passes through the rear rocker arm 21 along the width direction of the electric two-wheeler 100, so that the rear rocker arm 21 can rotate relative to the frame 10 about the axis of the rocker arm.

[0088] For example, the front end of the rear rocker arm 21 is located within the clearance space 401. The drive motor 50 includes a motor output shaft 51 that is connected to the walking mechanism 30. The motor output shaft 51 is located behind the rocker arm shaft 24, and the transmission connection is either chain drive or belt drive.

[0089] With the above arrangement, at least a portion of the rear rocker arm 21 is positioned in front of the drive motor 50, so that the rocker arm shaft 24 for fixing the rear rocker arm 21 is located in front of the motor output shaft 51, thereby shifting the center of gravity of the vehicle forward and greatly improving the handling of the vehicle.

[0090] Specifically, the frame 10 comprises a motor connecting bracket 13, the driving motor 50 is connected with the power battery 40 through the motor connecting bracket 13, and the weight of the driving motor 50 is borne through the power battery 40. In addition to being used as a connecting member between the power battery 40 and the driving motor 50, the motor connecting bracket 13 is also used for fixing the rear swing arm 21.

[0091] In the examples of the present application, the swing arm shaft 24 is arranged between the rear swing arm 21 and the motor connecting bracket 13 along the width direction, so that the rear swing arm 21 can rotate relative to the motor connecting bracket 13 around the axis of the swing arm shaft 24.

[0092] As an implementation manner, the distance D5 between the axis of the swing arm shaft 24 and the axis of the motor output shaft 51 is greater than or equal to 79 mm and less than or equal to 97 mm. Further, the distance D5 between the axis of the swing arm shaft 24 and the axis of the motor output shaft 51 is greater than or equal to 84 mm and less than or equal to 92 mm. More preferably, the distance D5 between the axis of the swing arm shaft 24 and the axis of the motor output shaft 51 is equal to 88 mm. In this way, interference between the front end of the rear swing arm 21 and the driving motor 50 or the power battery 40 during assembly is avoided, and the gravity center ratio is more reasonable.

[0093] As an implementation manner, the distance D6 between the axis of the output shaft and the rear swing arm 21 distributed along the height direction of the electric two-wheeled vehicle 100 is greater than or equal to 54 mm and less than or equal to 66 mm. Further, the distance D6 between the axis of the output shaft and the rear swing arm 21 distributed along the height direction of the electric two-wheeled vehicle 100 is greater than or equal to 57 mm and less than or equal to 63 mm. More preferably, the distance D6 between the axis of the output shaft and the rear swing arm 21 distributed along the height direction of the electric two-wheeled vehicle 100 is equal to 60 mm. It can be understood that if the distance D6 between the axis of the output shaft and the rear swing arm 21 distributed along the height direction of the electric two-wheeled vehicle 100 is too large, the curvature formed by the rear swing arm 21 is large, which occupies too much layout space of the whole vehicle, and is not conducive to the layout of the rear shock absorber 22 and other systems. Since the rear swing arm 21 and the motor connecting bracket 13 are movably connected, especially during vehicle driving, the rear swing arm 21 can vibrate in the up-down direction. If the distance D6 between the axis of the output shaft and the rear swing arm 21 distributed along the height direction of the electric two-wheeled vehicle 100 is too small, interference between the rear swing arm 21 and the driving motor 50, or between the rear swing arm 21 and the transmission assembly, can occur. Through the above arrangement, the gravity center of the whole vehicle is moved forward, and the compactness of the whole vehicle layout is improved.

[0094] Since the driving motor 50 is located between the motor connecting bracket 13 and the rear wheel 32, one end of the rear swing arm 21 is connected with the motor connecting bracket 13, and the other end of the rear swing arm 21 needs to be connected with the rear wheel 32, so there is a possibility of interference between the rear swing arm 21 and the driving motor 50. In order to avoid the assembly interference between the rear swing arm 21 and the driving motor 50 in the length direction of the electric two-wheeled vehicle 100, the present application provides a rear swing arm 21 in the following form:

[0095] As shown in Figure 13 , the rear swing arm 21 includes a curved portion 212 avoiding the driving motor 50, and the curved portion 212 is raised upwards of the electric two-wheeled vehicle 100 to form an arc-shaped rear swing arm 21. One end of the rear shock absorber 22 is movably connected with the power battery 40, and the other end of the rear shock absorber 22 is arranged at the curved portion 212 and movably connected with the rear swing arm 21.

[0096] As an implementation manner, the length of the rear swing arm 21 extending in the length direction of the electric two-wheeled vehicle 100 is defined as the rear swing arm length D7, and the ratio between the rear swing arm length D7 and the wheelbase D1 of the electric two-wheeled vehicle 100 is greater than or equal to 0.41 and less than or equal to 0.51. Further, the ratio between the rear swing arm length D7 and the wheelbase D1 of the electric two-wheeled vehicle 100 is greater than or equal to 0.44 and less than or equal to 0.48. More preferably, the ratio between the rear swing arm length D7 and the wheelbase D1 of the electric two-wheeled vehicle 100 is equal to 0.46. It should be noted that the ratio between the rear swing arm length D7 and the wheelbase D1 of the electric two-wheeled vehicle 100 can be used to measure the compactness between various systems and components during the whole vehicle assembly process. Since the swing arm shaft 24 for installing the rear swing arm 21 is arranged in front of the driving motor 50, based on the same vehicle frame 10 platform, the length of the rear swing arm 21 shown in the present application is shorter than the length of the existing rear swing arm 21, so that the length between the power battery 40, the driving motor 50 and the rear swing arm 21 distributed from front to back is also shorter, greatly saving the space occupied by the three in the whole vehicle arrangement, and the electric two-wheeled vehicle 100 can be provided with a larger power battery 40, which provides an optimization basis for improving the endurance of the electric two-wheeled vehicle 100.

[0097] As shown in Figure 14 , as an implementation manner, the electric two-wheeled vehicle 100 further includes a pedal assembly 60 for the user to step on, and at least part of the pedal assembly 60 is arranged on the vehicle frame 10. The pedal assembly 60 includes a pedal mounting bracket 61 and a pedal plate 62 arranged on the pedal mounting bracket 61, and the pedal mounting bracket 61 is fixedly connected with the rear vehicle frame 12 and the driving motor 50 respectively.

[0098] According to the above setting mode of the driving motor 50, the driving motor 50 is arranged on the power battery 40, and the driving motor 50 is supported by the power battery 40. In order to improve the stability of the driving motor 50, the driving motor 50 and the rear frame 12 are fixed by the pedal mounting bracket 61, so that the pedal mounting bracket 61 can reinforce the stability of the driving motor 50 and the power battery 40, and avoid damage to the battery pack shell 41.

[0099] Specifically, the rear frame 12 includes a rear main frame 121, and the rear main frame 121 is used to fix the middle frame 14 and the rear auxiliary frame 122, and is also used to fix the pedal mounting bracket 61.

[0100] Through the above setting, a separate bracket is avoided to be designed to reinforce the stability of the driving motor 50 and the power battery 40 when they are connected, and the cost of the frame 10 is reduced.

[0101] As an implementation manner, the pedal mounting bracket 61 includes a plurality of pedal mounting portions 611, and the pedal mounting bracket 61 is connected with the rear main frame 121 and the driving motor 50 through the pedal mounting portions 611, wherein the number of the pedal mounting portions 611 connected with the rear main frame 121 is greater than or equal to the number of the pedal mounting portions 611 connected with the driving motor 50.

[0102] Since the force applied by the user to the pedal plate 62 during riding is generally directed to the lower rear of the electric two-wheeled vehicle 100, and the rear main frame 121 is more stable and can bear greater load when connected with the power battery 40 than the driving motor 50. Therefore, more pedal mounting portions 611 are connected with the rear main frame 121 to ensure that the pedal mounting bracket 61 can bear greater load and improve its stability.

[0103] Optionally, the pedal mounting bracket 61 includes three pedal mounting portions 611 in a triangular distribution, wherein one pedal mounting portion 611 is fixedly connected with the driving motor 50, and the other two pedal mounting portions 611 are fixedly connected with the rear main frame 121. It can be understood that the pedal mounting portions 611 in a triangular distribution are more stable, and the number of corresponding fastening structures required to be arranged is less, thereby reducing the cost of the pedal mounting bracket 61 and improving the assembly efficiency.

[0104] In summary, by arranging the split type front frame 11 and the rear frame 12, the front and rear sides of the power battery 40 are connected with the front frame 11 and the rear frame 12 respectively, and the power battery 40 bears part of the function of the frame 10 to improve the compactness of the whole vehicle.

[0105] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An electric two-wheeled vehicle, comprising: a frame; a power battery, comprising a battery pack shell; a drive motor, electrically connected with the power battery; a walking mechanism, drivingly connected with the drive motor; characterized in that, the frame comprises a front frame and a rear frame, the front frame is arranged at the front side of the power battery and fixedly connected with the battery pack shell, and the rear frame is arranged at the rear side of the power battery and fixedly connected with the battery pack shell; the drive motor is installed on the side of the power battery facing the rear frame and fixedly connected with the battery pack shell, a reference plane perpendicular to the height direction of the electric two-wheeled vehicle is defined, and the projection of the drive motor on the reference plane along the height direction partially overlaps with the projection of the power battery on the reference plane along the height direction. 2.The electric two-wheeled vehicle according to claim 1, characterized in that, the side of the battery pack shell facing the rear frame is recessed inward to form an avoiding space, and at least part of the drive motor is arranged in the avoiding space. 3.The electric two-wheeled vehicle according to claim 1, characterized in that, the walking mechanism comprises a front wheel and a rear wheel, and the distance between the wheel shaft center of the front wheel and the wheel shaft center of the rear wheel is defined as a first distance, the distance between the front end of the power battery and the rear end of the drive motor along the length direction of the electric two-wheeled vehicle is defined as a second distance, and the ratio between the first distance and the second distance is greater than or equal to 0.47 and less than or equal to 0.

57. 4.The electric two-wheeled vehicle according to claim 1, characterized in that, the battery pack shell comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are distributed on the outer edge of the battery pack shell, the first connecting part is located at the front side of the second connecting part, the front frame is fixedly connected with the battery pack shell through the first connecting part, and the rear frame is fixedly connected with the battery pack shell through the second connecting part.

5. The electric two-wheeled vehicle of claim 1, wherein, The battery pack shell is made of aluminum alloy. 6.The electric two-wheeled vehicle according to claim 1, characterized in that, the frame comprises a motor connecting support arranged between the power battery and the drive motor, and the drive motor is relatively fixed with the battery pack shell through the motor connecting support; the maximum distance of the motor connecting support distributed in the width direction of the electric two-wheeled vehicle is defined as a first width, the maximum distance of the power battery distributed in the width direction of the electric two-wheeled vehicle is defined as a second width, and the ratio between the first width and the second width is greater than or equal to 0.6 and less than or equal to 0.

8. 7.The electric two-wheeled vehicle according to claim 6, characterized in that, the motor connecting support comprises a first connecting plate and a second connecting plate distributed in the width direction of the electric two-wheeled vehicle, the first connecting plate and the second connecting plate are distributed on the left and right sides of the drive motor and limit the drive motor in the width direction.

8. The electric two-wheeled vehicle according to claim 7, characterized in that, the first connecting plate and the second connecting plate are each provided with a motor connecting portion on a side facing the drive motor, and the first connecting plate and the second connecting plate are connected to the drive motor by the respective motor connecting portions in cooperation with fasteners.

9. The electric two-wheeled vehicle according to claim 8, characterized in that, the battery pack housing includes a fixing structure protruding toward a side of the drive motor, the fixing structure being distributed on left and right sides of the motor connecting bracket and limiting the motor connecting bracket in a width direction of the electric two-wheeled vehicle.

10. The electric two-wheeled vehicle according to claim 9, characterized in that, the motor connecting bracket further includes a sleeve and a fixing member, the sleeve being installed between the first connecting plate and the second connecting plate, the sleeve having two ends respectively abutting against the first connecting plate and the second connecting plate, and the fixing member passing through the fixing structure, the first connecting plate, the sleeve, and the second connecting plate to fixedly connect the motor connecting bracket and the battery pack housing.

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