Straddle type electric motorcycle

Abstract

The utility model discloses a straddle type electric motorcycle, the straddle type electric motorcycle comprises a frame, a walking assembly and a power assembly, the power assembly is in transmission connection with the walking assembly, and the power assembly comprises a driving motor and a speed reducing mechanism which are in transmission connection with each other; the speed reduction mechanism comprises a speed reduction gear set, the driving motor comprises a stator, a rotor and a motor shaft, the stator and the rotor sleeve the motor shaft, the rotor and the motor shaft are in transmission connection, the rotor rotates around the motor shaft, a containing space is formed in the rotor, and at least part of the speed reduction gear set is arranged in the containing space. The stator, the rotor and the reduction gear set are at least partially overlapped when viewed in the axis direction perpendicular to the motor shaft. Through the arrangement, the speed reducing mechanism part of the power assembly of the bestriding type electric motorcycle is arranged in the driving motor, so that the overall dimension of the power assembly can be reduced, the arrangement space required by the power assembly can be reduced, and the space utilization rate of the bestriding type electric motorcycle is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a straddle-type electric motorcycle. Background Art

[0002] With the continuous development of motorcycle electrification, high performance and small size have become necessary conditions for the design of electric motorcycle reducers, and the demand for motorcycle electrification is also gradually increasing. Compared with pedal-type electric motorcycles, straddle-type electric motorcycles have a unique driving method, that is, the range of human legs is limited, so the space requirements in the width direction of straddle-type electric motorcycles are relatively strict. In the case of a relatively large reduction ratio, the powertrain in the prior art usually needs to be arranged with two-stage reduction gears. This arrangement will result in a relatively large volume of the powertrain, which requires a large amount of layout space in the length and width directions of the straddle-type electric motorcycle, which limits the layout of the powertrain. Utility Model Content

[0003] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a straddle-type electric motorcycle whose power assembly has a compact structure.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] A straddle-type electric motorcycle comprises a frame, a traveling assembly and a power assembly, wherein the traveling assembly is at least partially arranged below the frame; the power assembly is transmission-connected to the traveling assembly, the power assembly comprises a driving motor and a reduction mechanism which are transmission-connected to each other; the reduction mechanism comprises a reduction gear set, the driving motor comprises a stator, a rotor and a motor shaft, the stator and the rotor are both sleeved on the motor shaft, the rotor is transmission-connected to the motor shaft, the rotor rotates around the motor shaft, an accommodating space is formed inside the rotor, the reduction gear set is at least partially arranged in the accommodating space, and when observed along an axial direction perpendicular to the motor shaft, the stator, the rotor and the reduction gear set at least partially overlap.

[0006] Furthermore, the reduction gear set includes a sun gear and a first-stage planetary gear meshing with the sun gear, and the sun gear and the first-stage planetary gear are at least partially arranged in the accommodating space; the motor shaft is at least partially arranged in the accommodating space, and the sun gear is sleeved on the motor shaft and is transmission-connected to the motor shaft.

[0007] Furthermore, the sun gear and the planetary gears are substantially distributed along the radial direction of the motor shaft in the accommodating space.

[0008] Furthermore, along the length direction of the powertrain, the ratio of the maximum length of the rotor to the maximum length of the portion of the reduction gear set within the accommodating space is greater than or equal to 4.3 and less than or equal to 5.3.

[0009] Furthermore, the reduction gear set also includes a secondary planetary gear, which is fixedly connected with the primary planetary gear and rotates coaxially.

[0010] Furthermore, the power assembly also includes a housing, the drive motor and the reduction mechanism are at least partially arranged in the housing, and the reduction gear set also includes an inner ring gear, which is fixedly connected to the housing and meshes with the secondary planetary gear.

[0011] Furthermore, the reduction gear set also includes a planet carrier, which is fixedly connected to the secondary planetary gear, and the power assembly also includes a sprocket, which is located outside the housing and is drivingly connected to the planet carrier.

[0012] Furthermore, a through hole is provided on the shell, the planet carrier is at least partially penetrated by the through hole, and the planet carrier located outside the shell is drivingly connected with the sprocket.

[0013] Furthermore, the drive motor further comprises a motor bearing, which is arranged between the motor shaft and the housing, and the reduction mechanism further comprises a planetary carrier bearing, which is arranged between the planetary carrier and the housing.

[0014] Furthermore, along the length direction of the power assembly, the maximum length of the power assembly is greater than or equal to 255 mm and less than or equal to 325 mm.

[0015] The powertrain of the straddle-type electric motorcycle can reduce the outline size of the powertrain by arranging the reduction mechanism part inside the drive motor, thereby reducing the layout space required for the powertrain and improving the space utilization of the straddle-type electric motorcycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of a straddle-type electric motorcycle according to an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of a powertrain according to an embodiment of the present application;

[0018] Figure 3 An exploded diagram of a powertrain according to an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of the arrangement of the drive motor and the reduction mechanism according to the embodiment of the present application;

[0020] Figure 5 It is a cross-sectional view of a powertrain according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 A straddle-type electric motorcycle 100 is shown, and the straddle-type electric motorcycle 100 includes a frame 11, a body cover 12, a traveling assembly 13, and a power assembly 14. The frame 11 constitutes the basic framework of the straddle-type electric motorcycle 100, and the frame 11 is used to carry other components of the straddle-type electric motorcycle 100. The body cover 12 is at least partially disposed on the frame 11, and the body cover 12 is used to protect the internal parts of the straddle-type electric motorcycle 100. The traveling assembly 13 is at least partially disposed below the frame 11, and the power assembly 14 is transmission-connected to the traveling assembly 13, and the power assembly 14 is used to provide power to the all-terrain vehicle to drive the traveling assembly 13 to move.

[0023] like Figure 2 and Figure 3 As shown, in order to clearly illustrate the technical solution of this application, the following are defined: Figure 3 The front side, rear side, left side and right side shown. It can be understood that the length direction in the embodiment of the present application refers to the front-to-back direction of the power assembly 14, and the width direction refers to the left-to-right direction of the power assembly 14. As an implementation method, for the straddle-type electric motorcycle 100, the power assembly 14 includes a drive motor 141 and a reduction mechanism 142 that are transmission-connected to each other. The drive motor 141 is used to provide power for the straddle-type electric motorcycle 100, and the reduction mechanism 142 can reduce the speed of the drive motor 141, thereby increasing the torque output by the power assembly 14 and improving the driving force obtained by the travel assembly 13, so that the power assembly 14 can better provide power for the straddle-type electric motorcycle 100. The power assembly 14 also includes a housing 143, and the drive motor 141 and the reduction mechanism 142 are at least partially disposed in the housing 143. Specifically, as Figure 4 As shown, the reduction mechanism 142 includes a reduction gear set 1421, which is at least partially arranged in the drive motor 141. The drive motor 141 includes a stator 1411, a rotor 1412 and a motor shaft 1413. The stator 1411 and the housing 143 are arranged to be fixedly connected. The stator 1411 is arranged around the rotor 1412 and the motor shaft 1413. The rotation axes of the stator 1411, the rotor 1412 and the motor shaft 1413 are on the same straight line. The rotor 1412 is sleeved on the motor shaft 1413 and is transmission-connected with the motor shaft 1413. During the rotation process, the rotor 1412 and the stator 1411 convert the electric power into the rotational force of the rotor 1412 through electromagnetic induction, thereby driving the motor shaft 1413 to rotate, and the power is transmitted to the walking component 13 after being decelerated by the reduction mechanism 142, thereby realizing the generation of power for the straddle-type electric motorcycle 100.

[0024] The driving motor 141 further includes a motor bearing 1414, which is disposed in the housing 143 and fixedly connected to the housing 143. The motor bearing 1414 is disposed between the motor shaft 1413 and the housing 143. The motor shaft 1413 is at least partially penetrated by the motor bearing 1414, thereby providing support for the motor shaft 1413 during the rotation of the motor shaft 1413. The rotor 1412 is sleeved on the motor shaft 1413 to drive the motor shaft 1413 to rotate, thereby transmitting the rotational force of the rotor 1412 to the motor shaft 1413, and then transmitting the rotational force of the rotor 1412 to the travel assembly 13 after the speed is reduced by the speed reduction mechanism 142, so as to drive the travel assembly 13 to move. Observed along the axial direction perpendicular to the motor shaft 1413, the stator 1411, the rotor 1412 and the reduction gear set 1421 at least partially overlap. By arranging at least part of the reduction gear set 1421 inside the drive motor 141, the power assembly 14 does not need to be designed with a large housing 143 to accommodate the reduction mechanism 142, thereby reducing the space occupied by the reduction gear set 1421 in the power assembly 14, and further reducing the outline size of the housing 143 of the power assembly 14, reducing the volume of the power assembly 14, and reducing the layout space required for the power assembly 14, thereby improving the space utilization of the straddle-type electric motorcycle 100.

[0025] like Figure 4As shown, as an optional implementation, the reduction gear set 1421 adopts a planetary gear set. The planetary gear set occupies a smaller area and there is no need to set up multiple transmission shafts, so that the reduction mechanism 142 does not occupy the layout space in the width direction of the powertrain 14, thereby reducing the size of the powertrain 14 in the width direction and the volume of the powertrain 14. The planetary gear set has better structural strength and can withstand larger loads. It still has higher working stability when the reduction ratio is relatively large. Therefore, unless otherwise specified, the reduction gear set 1421 mentioned below refers to the planetary gear set. An accommodation space 1412a is formed inside the rotor 1412, the motor shaft 1413 is at least partially disposed in the accommodation space 1412a, the reduction gear set 1421 includes a sun gear 1421a and a primary planetary gear 1421b, the sun gear 1421a and the primary planetary gear 1421b are meshed, the sun gear 1421a and the primary planetary gear 1421b are at least partially disposed in the accommodation space 1412a, and the sun gear 1421a and the primary planetary gear 1421b are substantially distributed in the accommodation space 1412a along a radial direction relative to the motor shaft 1413. Among them, the sun gear 1421a is sleeved on the motor shaft 1413 and is in transmission connection with the motor shaft 1413. By arranging the sun gear 1421a and the first-stage planetary gear 1421b in the accommodating space 1412a through the above-mentioned arrangement, the space occupied by the sun gear 1421a and the first-stage planetary gear 1421b in the housing 143 can be reduced, and the arrangement space required for the reduction mechanism 142 in the length direction of the powertrain 14 can be reduced, thereby reducing the length dimension of the powertrain 14 and the volume of the powertrain 14, thereby facilitating the arrangement of the powertrain 14 and improving the space utilization rate of the straddle-type electric motorcycle 100.

[0026] like Figure 4 and Figure 5As shown, along the length direction of the powertrain 14, the ratio of the maximum length L1 of the rotor 1412 to the maximum length L2 of the portion of the reduction gear set 1421 in the accommodating space 1412a is greater than or equal to 4.3 and less than or equal to 5.3, and the maximum length L3 of the powertrain 14 is greater than or equal to 255 mm and less than or equal to 325 mm. Further, the ratio of the maximum length L1 of the rotor 1412 to the maximum length L2 of the portion of the reduction gear set 1421 in the accommodating space 1412a is greater than or equal to 4.5 and less than or equal to 5, and the maximum length L3 of the powertrain 14 in the length direction is greater than or equal to 266 mm and less than or equal to 298 mm. In the present application, the ratio of the maximum length L1 of the rotor 1412 to the maximum length L2 of the portion of the reduction gear set 1421 in the accommodating space 1412a is 4.8, and the maximum length L3 of the powertrain 14 in the length direction is 271 mm. Through the above-mentioned arrangement, it is possible to avoid the reduction gear set 1421 occupying too much space in the accommodating space 1412a and affecting the normal operation of the motor shaft 1413 and the rotor 1412, and it is also possible to avoid the reduction gear set 1421 occupying too little space in the accommodating space 1412a and failing to effectively reduce the space occupied by the reduction mechanism 142 in the length direction of the power assembly 14. Therefore, without affecting the normal operation of the drive motor 141, the outline size of the power assembly 14 in the length direction can be reduced as much as possible. Compared with the existing drive motor 14, the outline size of the drive motor 141 in the length direction in the present application can be reduced by 35mm to 70mm, thereby reducing the volume of the power assembly 14 and saving a lot of space, thereby facilitating the layout of the power assembly 14 and improving the space utilization rate of the straddle-type electric motorcycle 100.

[0027] In this embodiment, the reduction gear set 1421 also includes a secondary planetary gear 1421c, which is fixedly connected to the primary planetary gear 1421b, and the secondary planetary gear 1421c and the primary planetary gear 1421b rotate coaxially. The secondary planetary gear 1421c and the primary planetary gear 1421b can be fixedly connected by welding to achieve coaxial rotation, and the secondary planetary gear 1421c and the primary planetary gear 1421b can also achieve coaxial rotation through splines. The reduction gear set 1421 also includes an inner ring gear 1421d, which is fixedly connected to the housing 143, and the inner ring gear 1421d is also meshed with the secondary planetary gear 1421c. After outputting power, the motor shaft 1413 transmits the power to the first-stage planetary gear 1421b through the sun gear 1421a, and the first-stage planetary gear 1421b transmits the power to the second-stage planetary gear 1421c. The first-stage planetary gear 1421b and the second-stage planetary gear 1421c can be set to have different numbers of teeth, so that when the second-stage planetary gear 1421c rotates in the inner ring 1421d, the reduction ratio of the reduction gear group 1421 can be further improved, so that the reduction ratio of the reduction mechanism 142 can meet the requirements of the straddle-type electric motorcycle 100.

[0028] Specifically, the reduction gear set 1421 further includes a planet carrier 1421e, which is fixedly connected to the secondary planetary gear 1421c, and the power assembly 14 further includes a sprocket 144, which is transmission-connected to the planet carrier 1421e. The sprocket 144 is arranged outside the housing 143, and the housing 143 is provided with a through hole 1431, and the planet carrier 1421e is at least partially penetrated by the through hole 1431, that is, the planet carrier 1421e is at least partially located outside the housing 143, and the planet carrier 1421e arranged outside the housing 143 is transmission-connected to the sprocket 144. The reduction gear set 1421 of the present application uses the sun gear 1421a as the driving wheel, the first-stage planetary gear 1421b and the second-stage planetary gear 1421c as the driven wheels, and the inner ring gear 1421d is fixed, so that the planet carrier 1421e is used as the output shaft, and the secondary reduction of the reduction gear set 1421 is realized through the meshing transmission of the sun gear 1421a and the first-stage planetary gear 1421b, the coaxial transmission of the first-stage planetary gear 1421b and the second-stage planetary gear 1421c, and the meshing transmission of the second-stage planetary gear 1421c and the inner ring gear 1421d, so that the speed output by the drive motor 141 is transmitted to the sprocket 144 through the planet carrier 1421e after the secondary reduction, and then the power is transmitted to the travel component 13 through the chain on the sprocket 144, thereby realizing the power output of the power assembly 14.

[0029] Furthermore, the reduction mechanism 142 also includes a planetary carrier bearing 1421f, which is arranged in the housing 143 and fixedly connected to the housing 143, and the planetary carrier bearing 1421f is arranged between the planetary carrier 1421e and the housing 143. The planetary carrier 1421e is at least partially penetrated by the planetary carrier bearing 1421f, and the planetary carrier bearing 1421f is arranged on the housing 143, so that the motor shaft 1413 and the planetary carrier bearing 1421f can support each other, thereby reducing the number of bearings arranged, simplifying the structure of the reduction mechanism 142, and further reducing the space occupied by the reduction mechanism 142, reducing the outline size of the powertrain 14, and reducing the volume of the powertrain 14.

[0030] As a possible implementation, the inner diameter of the rotor 1412 can be enlarged so that the sun gear 1421a and the first-stage planetary gear 1421b can be arranged in the accommodation space 1412a without affecting the normal operation of the rotor 1412 and the motor shaft 1413. It can be understood that the accommodation space 1412a of the rotor 1412 in the axial direction of the motor shaft 1413 can be enlarged so that the second-stage planetary gear 1421c can also be arranged in the accommodation space 1412a, thereby further reducing the layout space that the reduction mechanism 142 needs to occupy in the length direction of the power assembly 14, thereby reducing the length direction size of the power assembly 14 and reducing the volume of the power assembly 14.

[0031] 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. A straddle-type electric motorcycle, comprising: Frame; A traveling assembly, wherein the traveling assembly is at least partially disposed below the vehicle frame; A power assembly, the power assembly is transmission-connected to the travel assembly, and the power assembly includes a drive motor and a reduction mechanism that are transmission-connected to each other; It is characterized in that The deceleration mechanism includes a reduction gear set, and the drive motor includes a stator, a rotor and a motor shaft. The stator and the rotor are both sleeved on the motor shaft, and the rotor and the motor shaft are transmission connected, and the rotor rotates around the motor shaft; an accommodating space is formed inside the rotor, and the reduction gear set is at least partially arranged in the accommodating space. When observed along the axial direction perpendicular to the motor shaft, the stator, the rotor and the reduction gear set at least partially overlap.

2. The straddle-type electric motorcycle according to claim 1, characterized in that: The reduction gear set includes a sun gear and a first-stage planetary gear meshing with the sun gear. The sun gear, the first-stage planetary gear and the motor shaft are at least partially arranged in the accommodating space. The sun gear is sleeved on the motor shaft and is drivingly connected to the motor shaft.

3. The straddle-type electric motorcycle according to claim 2, characterized in that: The sun gear and the planetary gears are substantially distributed radially along the motor shaft in the accommodation space.

4. The straddle-type electric motorcycle according to claim 2, characterized in that: Along the length direction of the power assembly, a ratio of the maximum length of the rotor to the maximum length of the portion of the reduction gear set in the accommodating space is greater than or equal to 4.3 and less than or equal to 5.

3.

5. The straddle-type electric motorcycle according to claim 4, characterized in that: The reduction gear set also includes a secondary planetary gear, and the secondary planetary gear and the primary planetary gear are fixedly connected and rotate coaxially.

6. The straddle-type electric motorcycle according to claim 5, characterized in that: The power assembly also includes a housing, the drive motor and the reduction mechanism are at least partially arranged in the housing, and the reduction gear set also includes an inner ring gear, which is fixedly connected to the housing and meshes with the secondary planetary gear.

7. The straddle-type electric motorcycle according to claim 6, characterized in that: The reduction gear set also includes a planet carrier, which is fixedly connected to the secondary planetary gear. The power assembly also includes a sprocket, which is located outside the housing and is drivingly connected to the planet carrier.

8. The straddle-type electric motorcycle according to claim 7, characterized in that: The shell is provided with a through hole, the planet carrier at least partially passes through the through hole, and the planet carrier located outside the shell is drivingly connected with the sprocket.

9. The straddle-type electric motorcycle according to claim 8, characterized in that: The drive motor further includes a motor bearing, which is arranged between the motor shaft and the housing. The speed reduction mechanism further includes a planet carrier bearing, which is arranged between the planet carrier and the housing.

10. The straddle-type electric motorcycle according to claim 1, characterized in that: Along the length direction of the power assembly, the maximum length of the power assembly is greater than or equal to 255 mm and less than or equal to 325 mm.

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