Electric two-wheeled vehicle

Abstract

The utility model discloses an electric two-wheeled vehicle which comprises a vehicle frame, a power battery, a driving motor and a walking mechanism, the power battery comprises a battery pack shell, 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, a rear frame and a middle frame, and the front frame is arranged on the front side of the power battery and fixedly connected with the battery pack shell; the rear frame is arranged on the rear side of the power battery and is fixedly connected with the battery pack shell; the middle frames are distributed on the left side and the right side of the power battery, and the front ends and the rear ends of the middle frames are detachably connected with the front frame and the rear frame respectively. Through the arrangement, the weight of the frame is reduced, and the power battery is convenient to maintain through the arrangement of the detachable middle frame.

Description

Technical Field

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

[0002] An electric two-wheeled vehicle is a type of electric vehicle that uses a power battery to provide energy to drive the motor. The electric two-wheeled vehicle also includes a speed control device for controlling the drive motor. Other devices of the electric two-wheeled vehicle are basically the same as those of a motorcycle driven by an internal combustion engine.

[0003] The frames of existing electric two-wheelers are basically made of steel, and the overall weight of the frame is relatively large. Since electric two-wheelers are also equipped with power batteries and drive motors, the weight of the entire vehicle is greater than that of fuel vehicles. The frame structure of traditional fuel vehicles is surrounded by a space, and the engine is installed in this space. Since the engine is smaller in size than the combination of power batteries and drive motors, this space can meet the position adjustment during engine installation and maintenance. However, applying the existing fuel vehicle frame to electric two-wheelers faces the problem of inconvenient installation and maintenance of power batteries and drive motors. Utility Model Content

[0004] In order to address the deficiencies of the prior art, the purpose of the present application is to provide an electric two-wheeled vehicle with a relatively light overall weight and convenient maintenance of the power battery.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] An electric two-wheeled vehicle comprises a frame, a power battery, a drive motor and a traveling mechanism, wherein the power battery comprises a battery pack housing, the drive motor is electrically connected to the power battery, and the traveling mechanism is drivingly connected to the drive motor; the frame comprises a front frame, a rear frame and a middle frame, wherein the front frame is arranged at the front side of the power battery and is fixedly connected to the battery pack housing; the rear frame is arranged at the rear side of the power battery and is fixedly connected to the battery pack housing; the middle frame is distributed on the left and right sides of the power battery, and the front and rear ends of the middle frame are detachably connected to the front frame and the rear frame respectively.

[0007] Furthermore, the rear frame includes a rear main frame and a rear sub-frame connected to the rear main frame, the rear main frame is arranged between the power battery and the rear sub-frame, one end of the middle frame is fixedly connected to the front frame, and the other end is fixedly connected to the rear main frame.

[0008] Furthermore, the middle frame is formed by welding aluminum alloy pipes.

[0009] Furthermore, the middle frame includes a plurality of middle frame mounting parts, and the middle frame is respectively connected to the front frame and the rear main frame through the middle frame mounting parts. When viewed from the width direction of the electric two-wheeled vehicle, the plurality of middle frame mounting parts are distributed at the edges of the battery pack shell.

[0010] Furthermore, the front frame includes a first fixing portion and a second fixing portion, both of which are located at one end of the front frame close to the battery pack shell, and the front frame is fixedly connected to the battery pack shell through the first fixing portion. When the front frame is connected to the middle frame, the second fixing portion is correspondingly connected to the middle frame mounting portion.

[0011] Furthermore, the power battery includes a battery pack side cover which is covered on the battery pack shell, the battery pack side cover is arranged on at least one of the left and right sides of the battery pack shell, and the second fixing portion avoids the battery pack side cover in the width direction of the electric two-wheeled vehicle.

[0012] Furthermore, a reference plane perpendicular to the height direction of the electric two-wheeled vehicle is defined, and an angle between the extension direction of the middle frame and the reference plane is greater than or equal to 0° and less than or equal to 90°.

[0013] Furthermore, the middle frame includes a plurality of inclined tubular components, and the plurality of tubular components are welded together.

[0014] Furthermore, one side of the battery pack shell facing the rear frame is recessed toward the front side of the electric two-wheeled vehicle to form an escape space, at least a portion of the drive motor is disposed in the escape space, and the rear main frame is distributed on both sides of the escape space.

[0015] Furthermore, the frame includes a motor connecting bracket arranged between the power battery and the drive motor, and the drive motor is kept relatively fixed to the battery pack shell through the motor connecting bracket. The motor connecting bracket includes a first connecting plate and a second connecting plate distributed along 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.

[0016] The electric two-wheeled vehicle provided in the present application is provided with a detachable middle frame, and the front and rear ends of the middle frame are respectively connected to the front frame and the rear frame, so that the middle frame can strengthen the connection strength between the front frame and the rear frame, and also facilitates the maintenance of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of an electric two-wheeled vehicle in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of a partial structure of an electric two-wheeled vehicle in an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of a power battery and a drive motor in an embodiment of the present application;

[0020] Figure 4 An exploded view of a power battery and a drive motor in an embodiment of the present application;

[0021] Figure 5 A top view of a power battery and a drive motor in an embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the connection structure of the middle frame in the implementation manner of the present application;

[0023] Figure 7 In the implementation mode of this application Figure 6 A magnified image of point A;

[0024] Figure 8 This is a schematic diagram of the connection between the power battery and the suspension in the embodiment of the present application;

[0025] Fig. 9 An exploded view of the adapter bracket and the power battery in the implementation manner of the present application;

[0026] Fig.10 In the implementation mode of this application Fig. 9 A magnified view of point B;

[0027] Fig.11 In the implementation mode of this application Fig. 9 Enlarged view of point C;

[0028] Fig.12 A cross-sectional view of a power battery in an embodiment of the present application;

[0029] Fig.13 A side view of a power battery and a suspension in an embodiment of the present application;

[0030] Fig.14 Schematic diagram of a pedal assembly in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0032] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. "First", "second", "third", "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one of the features. The singular forms "a", "said", and "the" used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0033] like Figure 1 As shown, the present application provides an electric two-wheeled vehicle 100, which includes the basic components of the electric two-wheeled vehicle 100, such as a frame 10, a suspension 20, a traveling 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 traveling mechanism 30 is connected to the frame 10 through the suspension 20. The power battery 40 is mounted on the frame 10, and the power battery 40 is electrically connected to the driving motor 50, thereby providing energy for the driving motor 50. The driving motor 50 is mounted on the power battery 40 or the frame 10, and the driving motor 50 is transmission-connected to the traveling mechanism 30, thereby transmitting power to the traveling mechanism 30 to drive the electric two-wheeled vehicle 100 to travel. In order to clearly illustrate the technical solution of the present application, it is also defined as follows Figure 1 The up-down, left-right, and front-back directions are shown.

[0034] It should be noted that the "length direction" of the electric two-wheeled vehicle 100 mentioned below refers to the length of the electric two-wheeled vehicle 100 in the direction of Figure 1 The front-to-rear direction of the electric two-wheeled vehicle 100 is represented by the width direction of the electric two-wheeled vehicle 100 in the state shown in FIG. Figure 1 In the left-right direction of the state shown, the "height direction" of the electric two-wheeled vehicle 100 is represented by the height direction of the electric two-wheeled vehicle 100 in the state shown in FIG. Figure 1 Up and down direction in the state shown.

[0035] like Figure 2 and Figure 3 As shown, as an implementation method, the frame 10 includes a split front frame 11 and a split rear frame 12, the power battery 40 includes a battery pack shell 41, the front frame 11 is arranged on the front side of the power battery 40 and is fixedly connected to the battery pack shell 41, and the rear frame 12 is arranged on the rear side of the power battery 40 and is fixedly connected to the battery pack shell 41.

[0036] During the assembly process of the power battery 40, the power battery 40 is connected to the front frame 11 and the rear frame 12 on the front and rear sides respectively, and the frame 10 will not interfere with the power battery 40, which improves the convenience of assembling the power battery 40 on the frame 10. Compared with the existing assembly process, since the frame 10 is an integral component, the space surrounded by the frame 10 is relatively compact, and the space available for the battery to adjust its position when the motor is installed is relatively small, resulting in a more difficult battery installation process.

[0037] Specifically, the drive motor 50 is installed on the side of the power battery 40 facing the rear frame 12, and is fixedly connected to the battery pack housing 41. A reference plane 101 perpendicular to the height direction of the electric two-wheeled vehicle 100 is defined, and the projection of the drive motor 50 on the reference plane 101 along the height direction is defined as the motor projection, and the projection of the power battery 40 on the reference plane 101 along the height direction is defined as the battery projection, and the motor projection and the battery projection at least partially overlap.

[0038] Exemplarily, when viewed from the width direction of the electric two-wheeled vehicle 100, the battery pack housing 41 is substantially U-shaped, and the opening of the battery pack housing 41 faces the rear side of the electric two-wheeled vehicle 100. The drive motor 50 enters the area surrounded by the drive motor 50 along the opening and is fixed in the area.

[0039] In the electric two-wheeled vehicle 100, the space occupied by the drive motor and the power battery is relatively large. On the one hand, it is not conducive to the arrangement of other components and systems except the drive motor and the power battery. On the other hand, it is difficult to obtain a higher endurance by increasing the battery size due to the limitation of the vehicle wheelbase.

[0040] In the example of the present application, the battery pack housing 41 is recessed inwardly on one side facing the rear frame 12 to form an escape space 401, and at least part of the drive motor 50 is disposed in the escape space 401. The inward recess of the power battery 40 means that the power battery 40 is recessed toward the center of the space surrounded by the battery pack housing 41 to form an escape space 401 outside the space surrounded by the battery pack housing 41.

[0041] The battery pack shell 41 includes a first connecting portion 411 and a second connecting portion 412, which are distributed at 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 to the battery pack shell 41 through the first connecting portion 411, and the rear frame 12 is fixedly connected to the battery pack shell 41 through the second connecting portion 412.

[0042] Through the above arrangement, the space occupied by the drive motor 50 and the power battery 40 is reduced in the length direction of the electric two-wheeled vehicle 100. When the wheelbase of the vehicle is limited, the volume of the power battery 40 can be appropriately increased to improve the vehicle's endurance. In addition, compared with conventional frame forms, the structure based on the frame 10 and the power battery 40 can minimize the weight of the vehicle and improve the vehicle's maneuverability.

[0043] like Figure 2 As shown, the walking mechanism 30 includes a front wheel 31 and a rear wheel 32, and the distance between the center of the axle of the front wheel 31 and the center of the axle of the rear wheel 32 is defined as a first distance D1. It can be understood that the first distance D1 is the wheelbase of the vehicle; when the drive motor 50 is connected to the power battery 40, the distance from the rearmost end of the drive motor 50 to the frontmost end of the power battery 40 along the length direction of the electric two-wheeled vehicle 100 is defined as a second distance D2. As an implementation method, 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. Furthermore, 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 layout 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, the cost of the whole vehicle may increase, and the frame 10 with the increased wheelbase cannot be adapted to the existing vehicle platform, resulting in poor versatility. If the ratio between the second distance D2 and the first distance D1 is too small, the volume of the power battery 40 may be small, affecting the vehicle's endurance. Therefore, the above embodiment can improve the convenience of vehicle assembly while ensuring the vehicle's endurance as much as possible.

[0044] like Figure 3 As shown, as an implementation method, the frame 10 also 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.

[0045] It should be noted that, compared with an integrated frame, the overall strength of the frame 10 composed of the split front frame 11 and 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.

[0046] In the example of the present application, the motor connecting bracket 13 is made of aluminum alloy, so that the motor connecting bracket 13 has a higher structural strength while reducing the weight of the entire vehicle.

[0047] Observing from the width direction of the electric two-wheeled vehicle 100, the motor connection bracket 13 is basically arc-shaped, and since the outer contour of the drive motor 50 is basically arc-shaped, the motor connection bracket 13 can be arranged at the outer edge of the drive motor 50. It can be understood that since more wiring harnesses and controllers are arranged on both sides of the drive motor 50, and the left or right side of the drive motor 50 requires sufficient space for arranging the transmission assembly (not shown) between the drive motor 50 and the walking mechanism 30. Therefore, the motor connection bracket 13 arranged along the outer edge of the drive assembly can avoid interference with the peripheral components of the drive motor 50.

[0048] like Figure 3 As shown, further, the battery pack housing 41 includes a fixing structure 413 , which is disposed on a side of the battery pack housing 41 facing the drive motor 50 , and the battery pack housing 41 is fixedly connected to the motor connecting bracket 13 via the fixing structure 413 .

[0049] Exemplarily, the fixing structure 413 may be a protrusion extending from the battery pack housing 41 toward one side of the drive motor 50. When the motor connecting bracket 13 is connected to the power battery 40, the motor connecting bracket 13 is disposed between the left and right fixing structures 413. The motor connecting bracket 13 is limited in the width direction of the electric two-wheeled vehicle 100 by the left and right fixing structures 413.

[0050] like Figure 4 As shown, specifically, the motor connecting bracket 13 includes a first connecting plate 131 and a second connecting plate 132 distributed along 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 driving motor 50 to clamp the driving motor 50, and the driving motor 50 is limited in the width direction by the first connecting plate 131 and the second connecting plate 132 distributed on the left and right.

[0051] The first connecting plate 131 and the second connecting plate 132 are both provided with a motor connecting portion 133 on the side facing the drive motor 50, and a number of through holes are provided on the motor connecting portion 133. The side of the drive motor 50 facing the first connecting plate 131 and / or the second connecting plate 132 has a through hole that cooperates with the motor connecting portion 133. The fastener passes through the first connecting plate 131 and the drive motor 50, so that the first connecting plate 131 and the drive motor 50 are relatively fixed. The fastener passes through the second connecting plate 132 and the drive motor 50, so that the second connecting plate 132 and the drive motor 50 are relatively fixed.

[0052] The motor connection bracket 13 further includes a sleeve 134 and a fixing member 135. The sleeve 134 is installed between the first connection plate 131 and the second connection plate 132. The two ends of the sleeve 134 are respectively in contact with the first connection plate 131 and the second connection plate 132. The fixing member 135 passes through the fixing structure 413, the first connection plate 131, the sleeve 134 and the second connection plate 134. When the fixing member 135 passes through the first connection plate 131, the sleeve 134 and the second connection 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 shell 41, a force in a first direction is applied to the first connecting plate 131 and the second connecting plate 132 located at both ends thereof through the sleeve 134 (the first direction represents 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), and the fixing structure 413 applies a force in a second direction 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 causing deformation of the first connecting plate 131 and / or the second connecting plate 132.

[0053] In the example of the present 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 connection plate 131 and the connection plate 132. A component identical to the sleeve 134 is also provided between the two motor connection parts 133, thereby avoiding the risk of deformation of the motor connection part 133 due to the force applied by the fastener.

[0054] like Figure 5 As shown, the maximum distance of the motor connection bracket 13 in the width direction of the electric two-wheeled vehicle 100 is defined as the first width D3, and the maximum distance of the power battery 40 in the width direction of the electric two-wheeled vehicle 100 is defined as the second width D4. As an implementation method, 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 connection bracket 13 may be 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 motor connection bracket 13 when connected to the drive motor 50 is weak, resulting in the motor connection bracket 13 being unable to bear excessive stress, thereby affecting the stability of the connection between the drive motor 50 and the power battery 40. The above arrangement ensures the stability of the connection between the drive motor 50 and the power battery 40 without requiring a significant adjustment to the overall width of the vehicle.

[0055] like Figure 6 As shown, as an implementation method, the frame 10 also includes 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 to the front frame 11 and the rear frame 12 respectively.

[0056] Further, the middle frame 14 is detachably disposed 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 allows the power battery 40 to have better maintainability.

[0057] Specifically, the rear frame 12 includes a rear main frame 121 and a rear sub-frame 122 connected to the rear main frame 121 . The rear main frame 121 is fixedly connected to the power battery 40 and is distributed on the left and right sides of the drive motor 50 connection bracket 13 . The rear main frame 121 is arranged between the power battery 40 and the rear sub-frame 122 .

[0058] The power battery 40 has an end face for connecting to the rear frame 12, which end face is the rear side face of the power battery 40, at least part of the rear sub-frame 122 is connected to the lower part of the end face through the rear main frame 121, and at least part of the rear sub-frame 122 is also connected to the upper part of the end face, and the rear sub-frame 122 extends to the rear of the electric two-wheeled vehicle 100 and is used to support the seat of the electric two-wheeled vehicle 100.

[0059] It can be foreseen that the rear main frame 121 distributed on the left and right sides of the drive motor 50 connecting bracket 13 can prevent the drive motor 50 and the motor connecting bracket 13 from being exposed, while ensuring the connection strength between the rear frame 12 and the power battery 40, reducing the risk of damage to the drive motor 50.

[0060] In the example of the present application, one end of the middle frame 14 is fixedly connected to the front frame 11, and the other end of the middle frame 14 is fixedly connected to the rear main frame 121. The middle frame 14 is welded and formed by aluminum alloy pipes, which ensures that it has high structural strength while reducing the weight of the whole vehicle, thereby bringing better handling performance.

[0061] In the specific assembly process, the drive motor 50 is first connected to the motor connection bracket 13, and the end of the motor connection bracket 13 facing away from the drive motor 50 is fixedly connected to the power battery 40 to complete the assembly between the drive motor 50 and the power battery 40. Further, the front frame 11 and the rear sub-frame 122 are respectively installed on the front and rear sides of the power battery 40, and then the rear main frame 121 is respectively fixed to the left and right sides of the motor connection bracket 13, and the rear main frame 121 is respectively fixedly connected to the power battery 40 and the rear sub-frame 122 to form the main body outline of the electric two-wheeled vehicle 100. The middle frame 14 is respectively arranged on the left and right sides of the power battery 40, and is respectively fixed to 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 frame 14 on both sides can be disassembled, and it will not cause structural impact on the main body of the electric two-wheeled vehicle 100, thereby improving the convenience of maintenance of the power battery 40.

[0062] like Figure 6 As shown, as an optional implementation, the angle α 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°. The structural stability of the frame 10 composed of the split front frame 11 and the rear frame 12 is further improved by the inclined middle frame 14.

[0063] Furthermore, the middle frame 14 includes a plurality of inclined tubular members 141. The shape of the tubular members 141 is not specifically limited, and can be round tubes, square tubes, etc., and can be flexibly arranged according to the width of the vehicle or the assembly space. The supporting tubular members 141 are welded to facilitate the loading and unloading of the middle frame 14.

[0064] The rear main frame 121 distributed on the left and right sides of the drive motor 50 connecting bracket 13 can prevent the drive motor 50 and the motor connecting bracket 13 from being exposed. It can be foreseen that the rear main frame 121 basically covers the avoidance space 401 in the left and right directions. Since the middle frame 14 is connected to the rear main frame 121, the above arrangement can also shorten the length of the middle frame 14 and reduce the weight and cost of the whole vehicle.

[0065] like Figure 7 As shown, as an implementation, the middle frame 14 includes a plurality of middle frame mounting portions 142, and the middle frame 14 is respectively connected to the front frame 11 and the rear main frame 121 through the plurality of middle frame mounting portions 142. When viewed from the width direction of the electric two-wheeled vehicle 100, the plurality of middle frame mounting portions 142 are distributed at the edge of the battery pack housing 41.

[0066] In the example of the present application, the middle frame 14 is connected to the front frame 11 and the rear main frame 121 respectively through the middle frame mounting portion 142, so as to avoid setting corresponding mounting points on the power battery 40. When the middle frame 14 is disassembled, the overall stability of the frame 10 and the power battery 40 will not be affected.

[0067] Specifically, the front frame 11 includes a first fixing portion 111 and a second fixing portion 121, and the first fixing portion 111 and the second fixing portion 121 are both located at one end of the front frame 11 close to the battery pack housing 41. The front frame 11 is fixedly connected to the battery pack housing 41 through the first fixing portion 111, and when the front frame 11 is connected to the middle frame 14, the second fixing portion 121 is correspondingly connected to the middle frame mounting portion 142.

[0068] It should be noted that during the installation of the frame 10, multiple components may share one installation point, that is, multiple components are continuously penetrated by one bolt to reduce the number of openings of the components and the number of bolts used. The first fixing portion 111 and the second fixing portion 121 indicate that the front frame 11 has at least two non-co-point installations and non-interfering installation points, so as to avoid affecting the connection between the front frame 11 and the power battery 40 when the middle frame 14 is installed and unloaded.

[0069] like Figure 6 As shown, exemplarily, the power battery 40 also includes a battery pack side cover 43 covered on the battery pack shell 41, and the battery pack side cover 43 is arranged on at least one 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.

[0070] The second fixing portion 121 avoids the battery pack side cover 43 in the width direction, and a certain gap is provided between the second fixing portion 121 and the battery pack side cover 43 in the width direction, or the second fixing portion 121 extends above and in front of the power battery 40 to avoid the power battery 40. The above arrangement facilitates the removal of the battery pack side cover 43 from the battery pack housing 41.

[0071] like Figure 8 and Fig. 9 As shown, as an implementation mode, the suspension 20 includes a rear swing arm 21 and a rear shock absorber 22 connected to the rear swing arm 21, and the rear shock absorber 22 is specifically used to absorb the vibration transmitted by the rear swing arm 21, so as to improve the stability of the vehicle during travel. The suspension 20 also includes an adapter bracket 23, one end of the rear shock absorber 22 is movably connected to 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 to 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.

[0072] 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 to prevent the battery pack shell 41 of the power battery 40 from being deformed.

[0073] In the example of the present application, since the drive motor 50 is fixedly connected to the power battery 40 and is located behind the power battery 40, in order to avoid interference between the rear shock absorber 22 and the drive motor 50 during installation or when the rear shock absorber 22 shortens or lengthens along its own axial direction, the power battery 40 includes a bracket connecting structure 44 for fixing the adapter bracket 23, and the bracket connecting structure 44 is arranged above the drive motor 50 and the avoidance space 401 so that an angle is formed between the axis of the rear shock absorber 22 and the horizontal plane.

[0074] like Fig.10 and Fig.11 As shown, as an implementation method, the bracket connection structure 44 forms a receiving groove 441 for setting the adapter bracket 23, and the opening of the receiving groove 441 faces the rear side of the power battery 40. Observed from the height direction of the electric two-wheeled vehicle 100, the receiving groove 441 is basically "U"-shaped, so that the adapter bracket 23 can be embedded in the bracket connection structure 44. When the adapter bracket 23 is embedded in the receiving groove 441, at least part of the bracket connection 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 rear shock absorber 22 is prevented from slipping in the width direction, and the stability of the vehicle during travel is improved.

[0075] Specifically, the adapter bracket 23 includes a first mounting portion 231 and a second mounting portion 232, the first mounting portion 231 and the second mounting portion 232 are distributed in the up and down directions, and the number of the second mounting portions 232 is two, and the first mounting portion 231 is located between two adjacent second mounting portions 232, wherein the adapter bracket 23 is movably connected to the rear shock absorber 22 through the first mounting portion 231, and the adapter bracket 23 is fixedly connected to the bracket connecting structure 44 through the second mounting portion 232.

[0076] During the assembly of the rear shock absorber 22 and the power battery 40, the rear shock absorber 22 is first connected to 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 in the receiving groove 441 formed by the bracket connection 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 remain relatively fixed.

[0077] In the example of the present application, since the power battery 40 bears part of the function of the frame 10, if a corresponding cross beam of the frame 10 is provided on the rear frame 12, the cost and weight of the frame 10 may increase. Through the above arrangement, not only the material of the frame 10 is saved, the design of the cross beam of the frame 10 is avoided, the power battery 40 bears the force applied by the rear shock absorber 22, and based on the mutual cooperation between the adapter bracket 23 and the power battery 40, the stress on the power battery 40 is effectively reduced.

[0078] Furthermore, 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 both upper and lower sides of the first mounting portion 231, so as to ensure uniform force on the power battery 40. It can be foreseen that the second mounting portions 232 distributed on both 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 slippage between the adapter bracket 23 and the bracket connection structure 44.

[0079] Optionally, due to the angle formed between the rear shock absorber 22 and 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 parts 232 located on the upper and lower sides of the first mounting part 231 can be flexibly adjusted.

[0080] If the adapter bracket 23 above the first mounting portion 231 needs to bear a larger load, the number of the second mounting portions 232 above the first mounting portion 231 is greater than the number of the second mounting portions 232 below the first mounting portion 231 , and vice versa.

[0081] More specifically, the bracket connection structure 44 includes a matching portion 442 connected to the second mounting portion 232, and the matching portion 442 is a protrusion of the power battery 40 extending in the direction of the rear shock absorber 22. An escape zone 443 is formed between the matching portions 442 located at the upper and lower sides of the first mounting portion 231. It can be understood that since the first mounting portion 231 and the rear shock absorber 22 are connected by the fastener 4422, the escape zone 443 can avoid interference between the fastener 4422 and the first mounting portion 231 and the matching portion 442.

[0082] Exemplarily, the avoidance area 443 is specifically configured to be recessed toward the front side of the power battery 40 .

[0083] As an implementation method, the mating portion 442 has a channel that penetrates itself along the width direction of the electric two-wheeled vehicle 100, and a bushing 4421 is provided in the channel. The fastener 4422 is inserted into the bushing 4421 and the second mounting portion 232 of the adapter bracket 23, wherein the bushing 4421 is made of steel material, thereby increasing the hardness of the bushing 4421 and preventing the battery pack shell 41 of the power battery 40 from being worn.

[0084] Specifically, the bushing 4421 is sleeved on the fastener 4422 and can rotate relative to the fastener 4422 around the axis of the fastener 4422. In addition, the bushing 4421 is also clearance-matched with the inner wall of the channel.

[0085] Through the above arrangement, the bushing 4421 can move relative to the matching portion 442 along the width direction of the electric two-wheeled vehicle 100, and absorb the gap between the adapter bracket 23 and the bracket connecting structure 44 during the pre-tightening process of the fastener 4422.

[0086] like Fig.13 As shown, as an implementation method, 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 is passed through the rear rocker arm 21 along the width direction of the electric two-wheeled vehicle 100, so that the rear rocker arm 21 can rotate relative to the frame 10 around the axis of the rocker arm.

[0087] Exemplarily, the front end of the rear rocker arm 21 is arranged in the avoidance space 401. The drive motor 50 includes a motor output shaft 51 which is transmission-connected to the walking mechanism 30, and the motor output shaft 51 is arranged behind the rocker arm shaft 24, wherein the transmission connection mode is chain drive or belt drive.

[0088] Through the above arrangement, at least a portion of the rear swing arm 21 is disposed in front of the drive motor 50, so that the swing arm shaft 24 for fixing the rear swing arm 21 is located in front of the motor output shaft 51, and the center of gravity of the entire vehicle is moved forward, which can greatly improve the handling of the entire vehicle.

[0089] Specifically, the vehicle frame 10 includes a motor connection bracket 13, through which the drive motor 50 is connected to the power battery 40, and the weight of the drive motor 50 is borne by the power battery 40. In addition to being used as a connecting member between the power battery 40 and the drive motor 50, the motor connection bracket 13 is also used to fix the rear swing arm 21.

[0090] In the example of the present application, the rocker arm shaft 24 is passed between the rear rocker arm 21 and the motor connecting bracket 13 along the width direction, so that the rear rocker arm 21 can rotate relative to the motor connecting bracket 13 around the axis of the rocker arm shaft 24 .

[0091] As an implementation method, the distance D5 between the axis of the rocker 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. Furthermore, the distance D5 between the axis of the rocker 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 rocker 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 rocker arm 21 and the drive motor 50 or the power battery 40 during the assembly process is avoided, and the center of gravity ratio is more reasonable.

[0092] As an implementation method, the interval D6 between the axis of the output shaft and the rear swing arm 21 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 interval D6 between the axis of the output shaft and the rear swing arm 21 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 interval D6 between the axis of the output shaft and the rear swing arm 21 along the height direction of the electric two-wheeled vehicle 100 is equal to 60 mm. It is understandable that if the interval D6 between the axis of the output shaft and the rear swing arm 21 along the height direction of the electric two-wheeled vehicle 100 is too large, the arc formed by the rear swing arm 21 is large, which occupies too much layout space of the whole vehicle, which is not conducive to the layout of the rear shock absorber 22 and other systems; since the rear swing arm 21 and the motor connection bracket 13 are movably connected, especially during the driving process of the vehicle, the rear swing arm 21 may vibrate in the up and down directions. If the interval D6 between the axis of the output shaft and the rear swing arm 21 along the height direction of the electric two-wheeled vehicle 100 is too small, there may be interference between the rear swing arm 21 and the drive motor 50, or between the rear swing arm 21 and the transmission assembly. Through the above arrangement, the center of gravity of the whole vehicle is moved forward, and the compactness of the whole vehicle layout is improved.

[0093] Since the drive motor 50 is located between the motor connection bracket 13 and the rear wheel 32, one end of the rear swing arm 21 is connected to the motor connection bracket 13, and the other end of the rear swing arm 21 needs to be connected to the rear wheel 32, there is a possibility of interference between the rear swing arm 21 and the drive motor 50. In order to avoid assembly interference between the rear swing arm 21 and the drive motor 50 along the length direction of the electric two-wheeled vehicle 100. The present application provides the following form of the rear swing arm 21:

[0094] like Fig.13 As shown, the rear swing arm 21 includes a curved portion 212 for avoiding the driving motor 50, and the curved portion 212 bulges upwardly from 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 to the power battery 40, and the other end of the rear shock absorber 22 is disposed at the curved portion 212 and movably connected to the rear swing arm 21.

[0095] As an implementation method, the length of the rear swing arm 21 extending along the length direction of the electric motorcycle 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 assembly process of the whole vehicle. Since the swing arm shaft 24 for installing the rear swing arm 21 is arranged in front of the drive motor 50, based on the same 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 of the power battery 40, the drive motor 50 and the rear swing arm 21 distributed from front to rear is also shorter, which greatly saves the space occupied by the three when the whole vehicle is arranged. The electric two-wheeled vehicle 100 can be provided with a larger power battery 40, which provides an optimized basis for improving the battery life of the electric two-wheeled vehicle 100.

[0096] like Fig.14 As shown, as an implementation, the electric two-wheeled vehicle 100 further includes a pedal assembly 60 for a user to step on, and at least a portion of the pedal assembly 60 is disposed on the frame 10. The pedal assembly 60 includes a pedal mounting bracket 61 and a foot pedal 62 disposed on the pedal mounting bracket 61, and the pedal mounting bracket 61 is fixedly connected to the rear frame 12 and the drive motor 50, respectively.

[0097] According to the above arrangement of the drive motor 50, the drive motor 50 is arranged on the power battery 40, and the drive motor 50 is supported by the power battery 40. In order to improve the stability of the drive motor 50, the drive motor 50 is fixed to the rear frame 12 through the pedal mounting bracket 61, so that the pedal mounting bracket 61 can strengthen the stability of the drive motor 50 when connected to the power battery 40, and avoid damage to the battery pack housing 41.

[0098] Specifically, the rear frame 12 includes a rear main frame 121 . In addition to being used to fix the middle frame 14 and the rear sub-frame 122 , the rear main frame 121 is also used to fix the pedal mounting bracket 61 .

[0099] Through the above arrangement, it is avoided to design a separate bracket for reinforcing the stability when the drive motor 50 is connected to the power battery 40 , thereby reducing the cost of the frame 10 .

[0100] As an implementation method, the pedal mounting bracket 61 includes a plurality of pedal mounting portions 611, and the pedal mounting bracket 61 is connected to the rear main frame 121 and the drive motor 50 through the pedal mounting portions 611, wherein the number of the pedal mounting portions 611 connected to the rear main frame 121 is greater than or equal to the number of the pedal mounting portions 611 connected to the drive motor 50.

[0101] During riding, the force applied by the user to the pedal 62 is generally directed toward the rear and lower part of the electric two-wheeled vehicle 100, and the rear main frame 121 is more stably connected to the power battery 40 than the drive motor 50 and can bear a larger load. Therefore, by connecting more pedal mounting parts 611 to the rear main frame 121, it is ensured that the pedal mounting bracket 61 can bear a larger load and improve its stability.

[0102] Optionally, the pedal mounting bracket 61 includes three pedal mounting portions 611 distributed in a triangle, wherein one pedal mounting portion 611 is fixedly connected to the drive motor 50, and the remaining two pedal mounting portions 611 are fixedly connected to the rear main frame 121. It can be understood that the triangularly distributed pedal mounting portions 611 are more stable, and the number of corresponding fastening structures required to be set is less, which reduces the cost of the pedal mounting bracket 61 and improves its assembly efficiency.

[0103] In summary, by providing a split front frame 11 and a rear frame 12, the front and rear sides of the power battery 40 are connected to the front frame 11 and the rear frame 12 respectively, and the power battery 40 assumes part of the function of the frame 10 to improve the compactness of the entire vehicle.

[0104] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. An electric two-wheeled vehicle, comprising: Frame; A power battery, the power battery comprising a battery pack shell; a drive motor, the drive motor being electrically connected to the power battery; A walking mechanism, the walking mechanism is drivingly connected to the driving motor; Characterized in that the frame comprises: A front frame, which is arranged at the front side of the power battery and is fixedly connected to the battery pack housing; A rear frame, which is arranged at the rear side of the power battery and is fixedly connected to the battery pack housing; A middle frame, wherein the middle frame is distributed on the left and right sides of the power battery, and the front and rear ends of the middle frame are detachably connected to the front frame and the rear frame respectively.

2. The electric two-wheeled vehicle according to claim 1, characterized in that: The rear frame includes a rear main frame and a rear sub-frame connected to the rear main frame, the rear main frame is arranged between the power battery and the rear sub-frame, one end of the middle frame is fixedly connected to the front frame, and the other end is fixedly connected to the rear main frame.

3. The electric two-wheeled vehicle according to claim 1, characterized in that: The middle frame is formed by welding aluminum alloy pipes.

4. The electric two-wheeled vehicle according to claim 2, characterized in that: The middle frame includes a plurality of middle frame mounting parts, and the middle frame is connected to the front frame and the rear main frame respectively through the middle frame mounting parts. When viewed from the width direction of the electric two-wheeled vehicle, the plurality of middle frame mounting parts are distributed at the edges of the battery pack shell.

5. The electric two-wheeled vehicle according to claim 4, characterized in that: The front frame includes a first fixing portion and a second fixing portion, wherein the first fixing portion and the second fixing portion are both located at one end of the front frame close to the battery pack shell, and the front frame is fixedly connected to the battery pack shell via the first fixing portion. When the front frame is connected to the middle frame, the second fixing portion is correspondingly connected to the middle frame mounting portion.

6. The electric two-wheeled vehicle according to claim 5, characterized in that: The power battery includes a battery pack side cover disposed on the battery pack shell, the battery pack side cover is disposed on at least one of the left and right sides of the battery pack shell, and the second fixing portion avoids the battery pack side cover in the width direction of the electric two-wheeled vehicle.

7. The electric two-wheeled vehicle according to claim 1, characterized in that: A reference plane perpendicular to the height direction of the electric two-wheeled vehicle is defined, and an angle between the extension direction of the middle frame and the reference plane is greater than or equal to 0° and less than or equal to 90°.

8. The electric two-wheeled vehicle according to claim 1, characterized in that: The middle frame comprises a plurality of inclined tubular components, and the plurality of tubular components are welded together.

9. The electric two-wheeled vehicle according to claim 2, characterized in that: The side of the battery pack shell facing the rear frame is recessed toward the front side of the electric two-wheeled vehicle to form an escape space, at least a portion of the drive motor is arranged in the escape space, and the rear main frame is distributed on both sides of the escape space.

10. The electric two-wheeled vehicle according to claim 1, characterized in that: The frame includes a motor connecting bracket arranged between the power battery and the drive motor, and the drive motor is kept relatively fixed to the battery pack shell through the motor connecting bracket. The motor connecting bracket includes a first connecting plate and a second connecting plate distributed along 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.

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