Motorcycle with motor assembly and motorcycle with motor assembly

Abstract

The application discloses a motor assembly and a motorcycle adopting the motor assembly. The motor assembly comprises a motor, a speed reducer and three-phase line terminals. The motor comprises a casing, a stator, a rotor and a rotating shaft. The casing comprises an outer shell and an end cover arranged at one side of the outer shell. The stator and the rotor are arranged in the casing and are sleeved and matched, and the rotating shaft fixes the rotor. The speed reducer is connected to the side of the end cover away from the outer shell, the speed reducer comprises a gear set, a power input shaft and a power output shaft, and the power input shaft and the power output shaft are drivingly connected through the gear set. The three-phase line terminals are connected to the stator through wires. The three-phase line terminals are mounted on the end cover and are located above the speed reducer. When viewed along the axial direction of the rotating shaft, a straight line passing through the rotation center of the power input shaft and the rotation center of the power output shaft is defined as a reference line, the reference line is arranged obliquely, and the three-phase line terminals are located on the upper side of the reference line. The motor assembly can be better assembled into a compact frame.

Description

[0001] This application claims priority to Chinese patent application No. 202510238124.1, filed with the Chinese Patent Office on February 28, 2025, entitled "Electric Motorcycle". Technical Field

[0002] This application relates to the field of vehicle technology, and more particularly to an electric motor assembly and a motorcycle using the electric motor assembly. Background Technology

[0003] Against the backdrop of increasingly severe environmental pollution and energy shortages, and the gradual replacement of gasoline and diesel as the driving energy source for vehicles due to the advantages of energy saving and environmental protection, the use of electric energy as a driving energy source is also gradually extending from road-use electric motorcycles to electric motorcycles in various functional scenarios. Unlike road-use electric motorcycles, off-road electric motorcycles require frequent extreme acceleration, resulting in more serious energy consumption and exhaust pollution. In order to further achieve energy saving and environmental protection, it is particularly important to reform off-road electric motorcycles into electric motorcycles.

[0004] The power battery, motor control components, and motor assembly in the electronic control system are core components of electric motorcycles, and their arrangement and placement affect the off-road performance of the motorcycles. Existing electric motorcycles suffer from the following problems:

[0005] Without reducing the power of the motor assembly, its size is usually not easy to reduce, which makes it difficult to fit the motor assembly into a compact frame. Utility Model Content

[0006] In view of this, it is necessary to provide a motor assembly and a motorcycle using the motor assembly, wherein the structure of the motor assembly is optimized and can be better fitted into a compact frame.

[0007] On one hand, embodiments of this application provide a motor assembly, including a motor, a reducer, and three-phase terminals; the motor includes a housing, a stator, a rotor, and a rotating shaft; the housing includes an outer shell and an end cover, with the end cover connected to one side of the outer shell along the axial direction of the rotating shaft; both the stator and rotor are disposed within the housing, with the stator sleeved on the outer periphery of the rotor, and the rotating shaft fixed to the rotor; the reducer is connected to the side of the end cover away from the outer shell, and the reducer has an installation cavity, including a gear set, a power input shaft, and a power output shaft, which are disposed within the installation cavity, and the power input shaft and power output shaft are connected by a gear set for transmission, with one end of the power input shaft being connected to the rotating shaft for transmission; the three-phase terminals are connected to the stator via wires; the three-phase terminals are mounted on the end cover and located above the reducer; when viewed along the axial direction of the rotating shaft, a straight line passing through the rotation center of the power input shaft and the rotation center of the power output shaft is defined as a reference line, which is inclined, and the three-phase terminals are substantially located above the reference line.

[0008] Furthermore, the installation cavity is equipped with an oil-gas separation structure, which is located basically above the reference line.

[0009] Furthermore, the oil-gas separation structure includes a first partition, a second partition, and an exhaust valve. The first partition and the inner wall of the mounting cavity form an oil-gas separation chamber. The upper end of the oil-gas separation chamber has an opening and is connected to the exhaust valve. The lower end of the oil-gas separation chamber has an inlet and outlet opening. The second partition divides the oil-gas separation chamber into an oil-gas inlet channel and an oil return channel. The oil-gas inlet channel is closer to the reference line than the oil return channel. A gap is maintained between the upper end of the second partition and the upper end of the oil-gas separation chamber to connect the oil-gas inlet channel and the oil return channel. The inlet and outlet opening is divided by the second partition into two parts belonging to the oil-gas inlet channel and the oil return channel, respectively. The width of the oil-gas inlet channel at the inlet and outlet opening is greater than the width of the oil return channel at the inlet and outlet opening.

[0010] Furthermore, the gear set includes an input gear and an output gear. The input gear is connected to the power input shaft, and the output gear is connected to the power output shaft. The input gear and the output gear mesh. A first partition is arranged around the outer periphery of the input gear and the output gear whose rotation center line is higher.

[0011] Furthermore, the rotation center line of the input gear is higher than that of the output gear, and the transmission ratio between the input gear and the output gear is greater than 1; when viewed along the axial direction of the rotation shaft, the oil-gas separation structure is located on the side of the input gear in a direction perpendicular to the reference line.

[0012] Furthermore, the first partition plate has a through groove at one end near the inlet / outlet opening. When viewed along the axis of rotation, the through groove passes through both sides of the first partition plate in a direction perpendicular to the reference line. Along the axis of rotation, the width of the through groove is less than the width of the first partition plate.

[0013] Furthermore, when viewed along the axis of rotation, the extension direction of the lower end of the second partition does not intersect with the outer periphery of the output gear.

[0014] Furthermore, the power output shaft is located below the power input shaft.

[0015] On the other hand, embodiments of this application provide an electric motorcycle, including a frame, a body panel, a power battery, and a running system. The body panel at least partially covers the frame; the power battery is supported by the frame; the running system includes a front running wheel and a rear running wheel, with at least a portion of the front running wheel and at least a portion of the rear running wheel located below the frame; the electric motorcycle also includes a motor assembly as described in any of the above embodiments, the motor assembly is supported by the frame, the motor assembly is electrically connected to the power battery, and the rear running wheel is drive-connected to the power output shaft.

[0016] Furthermore, the wheel axle spacing between the front and rear wheels ranges from 1000mm to 1100mm, and the motor power in the motor assembly ranges from 1kW to 3kW.

[0017] In this application, the above-described arrangement allows the three-phase terminals and the reducer to be mounted on the same side of the housing, thereby reducing the overall width dimension of the motor assembly. Furthermore, the technical solution of this application optimizes the arrangement of the three-phase terminals and the reducer on the same side, reducing their proportion of height on one side of the housing. In other words, the layout of the three-phase terminals and the reducer is more concentrated and compact. Therefore, without reducing the motor's power, the above-described arrangement reduces the space occupied by the motor assembly in the axial direction of the rotation shaft and in the height direction, thus adapting it to a compact vehicle frame. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of an electric motorcycle according to an embodiment of this application is shown.

[0019] Figure 2 A schematic diagram of the vehicle frame structure in an embodiment of this application is shown.

[0020] Figure 3 A directional schematic diagram of an electric motorcycle according to an embodiment of this application is shown.

[0021] Figure 4 A schematic diagram of the motor assembly in an embodiment of this application is shown.

[0022] Figure 5 A schematic diagram of the disassembled structure of the motor assembly in an embodiment of this application is shown.

[0023] Figure 6This paper presents a schematic diagram of the disassembled structure of the motor assembly from another perspective in an embodiment of this application.

[0024] Figure 7 A state diagram of the oil in the first casing according to an embodiment of this application is shown.

[0025] Figure 8 A state diagram of the oil in the second casing according to an embodiment of this application is shown. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0027] When a component is considered to be "located" on another component, it can be directly on the other component or may also be interspersed with other components. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may also be interspersed with other components.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] It is understandable that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular or equal to each other. For example, combined with numerical description, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane".

[0030] The term "parallel" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately parallel. For example, in numerical terms, parallel can refer to the angle between two straight lines within the range of 180° ± 10°, the dihedral angle between two planes within the range of 180° ± 10°, or the angle between a straight line and a plane within the range of 180° ± 10°. The two components described as "parallel" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane".

[0031] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more.

[0032] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] Please refer to the following: Figure 1 and Figure 2 The electric motorcycle 100 includes a frame 11, a body panel 12, a motor assembly 200, a power battery 13, an electronic control system (not shown), a running system 15, and a suspension assembly 16. The frame 11 forms the basic framework of the electric motorcycle 100 and supports other components. The body panel 12 is at least partially mounted on the frame 11 and protects the internal parts of the electric motorcycle 100. The power battery 13 is supported by the frame 11 and supplies power to the motor assembly 200. The electronic control system includes a motor control assembly 14 electrically connected to the motor assembly 200 and primarily controls the motor assembly 200. The motor assembly 200 is supported by the frame 11, and the running system 15 is connected to the motor assembly 200 via a drive system, which receives driving force from the motor assembly 200 to propel the electric motorcycle 100. The running system 15 includes a front running wheel 151 positioned at the front of the electric motorcycle 100 and a rear running wheel 152 positioned at the rear of the electric motorcycle 100. At least a portion of the front running wheel 151 and at least a portion of the rear running wheel 152 are located below the frame 11, and the front running wheel 151 and the rear running wheel 152 are rotatably connected to the front and rear ends of the frame 11, respectively. The suspension assembly 16 includes a front suspension assembly and a rear suspension assembly. The front suspension assembly connects the front running wheel 151 to the frame 11, and the rear suspension assembly connects the rear running wheel 152 to the frame 11.

[0034] For ease of expression, the definitions in this application are as follows: Figure 3The directions shown are front, back, left, right, up, and down. The front-back direction refers to the length of the frame 11 of the electric motorcycle 100, the left-right direction refers to the width of the frame 11, and the up-down direction refers to the height of the frame 11. In this embodiment, the front, back, left, right, up, and down directions are based on the electric motorcycle 100 traveling on a level road surface, not on a sloping road surface.

[0035] The electric motorcycle 100 also includes a bracket 31, which is installed at the lowest point of the frame 11. The motor assembly 200 is fixed above the lowest point of the frame 11 to lower the center of gravity of the vehicle.

[0036] When the axle distance between the front drive wheel 151 and the rear drive wheel 152 is between 1000mm and 1100mm, the motor power in the motor assembly 200 can be selected from 1kW to 3kW. This configuration makes the electric motorcycle 100 suitable for off-road use by teenagers. It should be noted that the wheelbase of the electric motorcycle 100 is the distance between the rotation center of the front drive wheel 151 and the rotation center of the rear drive wheel 152.

[0037] Optionally, the wheel axle spacing between the front traveling wheel 151 and the rear traveling wheel 152 can be any one or any combination of two of the following: 1000mm, 1010mm, 1020mm, 1030mm, 1040mm, 1050mm, 1060mm, 1061mm, 1062mm, 1063mm, 1064mm, 1065mm, 1066mm, 1067mm, 1068mm, 1069mm, 1070mm, 1080mm, 1090mm, and 1100mm.

[0038] Optionally, the motor power in the motor assembly 200 can be any one or any combination of 1kW, 1.1kW, 1.2kW, 1.3kW, 1.4kW, 1.5kW, 1.6kW, 1.7kW, 1.8kW, 1.9kW, 2kW, 2.1kW, 2.2kW, 2.3kW, 2.4kW, 2.5kW, 2.6kW, 2.7kW, 2.8kW, 2.9kW, and 3kW.

[0039] Please refer to the following: Figure 2 and Figure 4 The motor assembly 200 includes a motor 21 and a reducer 22. The motor 21 is fixed to the frame 11, and the reducer 22 is connected to the left or right side of the motor 21. In this implementation, the left side is used as an example to reduce the rotational torque output by the motor 21. The reducer 22 is also connected to the rear wheel 152 via a chain 23 and a chain 24 to drive the electric motorcycle 100.

[0040] Please refer to the following: Figure 5 and Figure 6 The motor 21 includes a housing 211, a stator 212, a rotor 213, a rotating shaft 214, and three-phase terminals 215. The housing 211 includes an outer shell 2111 and an end cover 2112, with the outer shell 2111 fixed to the frame 11. The axis of the rotating shaft 214 is parallel to the left-right direction. Along the axis of the rotating shaft 214, the end cover 2112 is connected to one side of the outer shell 2111 and is sealed to it. Both the stator 212 and the rotor 213 are housed within the housing 211, with the stator 212 fitted around the outer circumference of the rotor 213. The rotating shaft 214 is fixed to the rotor 213. A reducer 22 is connected to the side of the end cover 2112 away from the outer shell 2111. One end of the rotating shaft 214 extends from the end cover 2112 and connects to the reducer 22, driving the reducer 22 through the rotating shaft 214. The three-phase terminal 215 is mounted on the end cover 2112 and located above the reducer 22. The three-phase terminal 215 is connected to the stator 212 via a wire (not shown), and is also electrically connected to the control wiring harness of the motor control assembly 14 via an external wire (not shown). By placing the three-phase terminal 215 on the same side as the reducer 22, the space on one side of the housing 211 can be fully utilized.

[0041] Please refer to the following: Figure 6 and Figure 7 The reducer 22 includes a gear set 222, a power input shaft 223, and a power output shaft 224. A mounting cavity 201 is provided within the reducer 22, and the gear set 222, power input shaft 223, and power output shaft 224 are all located within the mounting cavity 201. Oil 41 is provided within the mounting cavity 201 for lubricating the gear set 222. The gear set 222 is connected between the power input shaft 223 and the power output shaft 224. The power input shaft 223 is rotatably mounted within the mounting cavity 201 and is connected to a rotating shaft 214. The power output shaft 224 is rotatably mounted within the mounting cavity 201, with one end extending out of the mounting cavity 201 to output power to the rear travel wheel 152.

[0042] Viewed from the axial direction of the rotating shaft 214, the straight line passing through the rotation center of the power input shaft 223 and the rotation center of the power output shaft 224 is defined as the reference line S1. The reference line S1 is set at an angle, and the three-phase terminal 215 is basically located on one side and above the reference line S1 (see...). Figure 2This arrangement, with the three-phase terminal 215 and the reducer 22 on the same side of the housing 211, optimizes their layout, reducing their proportion of height on one side of the housing 211. In other words, it allows for a more concentrated and compact arrangement of the three-phase terminal 215 and the reducer 22. Therefore, without reducing the power of the motor 21, this arrangement reduces the space occupied by the motor assembly 200 along the axis of the rotation shaft 214 and in the height direction, thus adapting it to a compact frame 11.

[0043] Please refer to the following: Figures 6 to 8 In one implementation, the mounting cavity 201 is provided with an oil-gas separation structure 221, which is basically located on one side of the reference line S1 and above the reference line S1.

[0044] The oil-gas separation structure 221 includes a first partition 2211, a second partition 2212, and an exhaust valve 225. The first partition 2211 and the inner wall of the mounting cavity 201 form an oil-gas separation chamber 2215. The upper end of the oil-gas separation chamber 2215 has an opening and is connected to the exhaust valve 225. The lower end of the oil-gas separation chamber 2215 has an inlet / outlet opening 2216. The second partition 2212 divides the oil-gas separation chamber 2215 into an oil-gas inlet channel 2213 and an oil return channel 2214. The oil-gas inlet channel 2213 is closer to the reference line S1 than the oil return channel 2214. The upper end of the second partition 2212 maintains a gap with the upper end of the oil-gas separation chamber 2215 to connect the oil-gas inlet channel 2213 and the oil return channel 2214. The inlet / outlet opening 2216 is divided by the second partition 2212 into two parts belonging to the oil-gas inlet channel 2213 and the oil return channel 2214, respectively. The width of the oil-gas inlet channel 2213 at the inlet / outlet opening 2216 is greater than the width of the oil return channel 2214 at the inlet / outlet opening 2216.

[0045] The oil-gas mixture 202 inside the mounting cavity 201 enters upward through the inlet / outlet opening 2216 into the oil-gas separation chamber 2215, specifically into the oil-gas inlet channel 2213. At the top of the oil-gas inlet channel 2213, that is, at the junction of the oil-gas inlet channel 2213 and the oil return channel 2214, especially near the exhaust valve 225, the oil that is separated from the oil-gas mixture 202 will flow downward back, mainly back into the oil return channel 2214, and finally back to the vicinity of the gear set 222 through the inlet / outlet opening 2216.

[0046] It is also worth noting that since the width of the oil and gas inlet channel 2213 at the inlet and outlet opening 2216 is greater than the width of the oil return channel 2214 at the inlet and outlet opening 2216, more of the oil-gas mixture 202 can enter the oil and gas inlet channel 2213, meaning less of the oil-gas mixture 202 enters the oil return channel 2214. Therefore, the oil flowing downwards in the oil return channel 2214 can flow down more smoothly.

[0047] In one implementation, the gear set 222 includes an input gear 2221 and an output gear 2222. The input gear 2221 is connected to a power input shaft 223, and the output gear 2222 is connected to a power output shaft 224. The input gear 2221 and the output gear 2222 mesh. A first partition 2211 is disposed around the outer periphery of the gear with the higher rotational center line between the input gear 2221 and the output gear 2222.

[0048] In one specific implementation, the rotation center line of the input gear 2221 is higher than the rotation center line of the output gear 2222, that is, the power output shaft 224 is located below the power input shaft 223, and the transmission ratio between the input gear 2221 and the output gear 2222 is greater than 1. Viewed along the axial direction of the rotation shaft 214, the oil-gas separation structure 221 is located on one side of the input gear 2221 along a direction perpendicular to the reference line S1, specifically the upper right side (see...). Figure 6 In another specific implementation, the rotation center line of the input gear 2221 is lower than the rotation center line of the output gear 2222, that is, the power output shaft 224 is located above the power input shaft 223, and the transmission ratio between the input gear 2221 and the output gear 2222 is greater than 1. Viewed along the axial direction of the rotation shaft 214, the oil-gas separation structure 221 is still located on one side of the input gear 2221 along the direction perpendicular to the reference line S1, but specifically on the lower left side (not shown in the figure).

[0049] This configuration allows the lateral space of the smaller outer diameter input gear 2221 to be utilized for accommodating the oil-gas separation structure 221, further optimizing the space.

[0050] In one implementation, the first partition 2211 has a through groove 2211B at one end near the inlet / outlet opening 2216. Viewed along the axis of the rotation shaft 214, the through groove 2211B penetrates both sides of the first partition 2211 in a direction perpendicular to the reference line S1. Along the axis of the rotation shaft 214, the width of the through groove 2211B is less than the width of the first partition 2211. The through groove 2211B increases the amount of oil-gas mixture 202 entering the oil-gas inlet channel 2213, thereby improving collection capacity.

[0051] In one implementation, when viewed along the axial direction of the rotation shaft 214, the extension direction of the lower end of the second partition 2212 does not intersect the outer periphery of the output gear 2222. If the section corresponding to the lower end of the second partition 2212 is a straight section, then the extension direction of the lower end of the second partition 2212 refers to the extension direction of that straight section; if the section corresponding to the lower end of the second partition 2212 is arc-shaped, then the extension direction of the lower end of the second partition 2212 is parallel to the tangent line tangent to its arc-shaped lower end. This arrangement reduces the amount of oil-gas mixture 202 flowing upward from the oil return channel 2214, which is equivalent to increasing the amount of oil-gas mixture 202 entering and flowing upward from the oil-gas inlet channel 2213.

[0052] Please refer to the following: Figure 5 and Figure 6 In one implementation, the reducer 22 includes a first housing 226 and a second housing 227. Along the axial direction of the rotating shaft 214, the first housing 226 is connected to the end cover 2122, and the second housing 227 is connected to the side of the first housing 226 away from the end cover 2122. A mounting cavity 201 is formed between the first housing 226 and the second housing 227. The first partition 2211 includes two first split partitions 2211A, one of which is located in the first housing 226, and the other is located in the second housing 227. The two first split partitions 2211A are joined together to form the first partition 2211. The second partition 2212 includes two second split partitions 2212B, one of which is located on the first outer shell 226 and the other is located on the second outer shell 227. The two second split partitions 2212B are joined together to form the second partition 2212.

[0053] The first outer shell 226 has a plurality of first connecting ears 2261 protruding outward from its periphery, and the second outer shell 227 has a plurality of second connecting ears 2271 protruding outward from its periphery. Each first connecting ear 2261 and a second connecting ear 2271 overlap in the left-right direction and are connected by fasteners 228 to improve the stability of the connection between the first outer shell 226 and the second outer shell 227.

[0054] The reducer 22 also includes a receiving cavity 203 communicating with the mounting cavity 201. Along the axial direction of the rotation shaft 214, the receiving cavity 203 is located on the side of the mounting cavity 201 away from the end cover 2122. Specifically, the receiving cavity 203 is located on the side of the second outer shell 227 away from the first outer shell 226. A cover 2273 for sealing the opening of the receiving cavity 203 is detachably connected to the cavity opening. The motor assembly 20 also includes a sensor 216, which is located in the receiving cavity 203. One end of the power input shaft 223 extends into the receiving cavity 203. The sensor 216 is used to detect the rotation angle, rotation speed, or rotation stroke of the power input shaft 223. By placing the sensor 216 on the same side as the reducer 22, the concept of centralized arrangement and reduced size of the motor assembly 20 is reflected. In one specific implementation, the sensor 216 is a hysteresis sensor.

[0055] When it is necessary to install, disassemble, inspect, and maintain the sensor 216, the cover 2273 can be opened directly from the outside for operation, which is convenient and practical.

[0056] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of this application's disclosure.

Claims

1. A motor assembly, comprising: An electric motor, comprising a housing, a stator, a rotor, and a rotating shaft; the housing includes an outer shell and an end cover, the end cover being connected to one side of the outer shell along the axial direction of the rotating shaft, the stator and the rotor being disposed within the housing, the stator being sleeved on the outer periphery of the rotor, and the rotating shaft being fixed to the rotor; A speed reducer is connected to the side of the end cover away from the outer casing. The speed reducer has an installation cavity and includes a gear set, a power input shaft, and a power output shaft. The gear set, the power input shaft, and the power output shaft are disposed in the installation cavity. The power input shaft and the power output shaft are connected by the gear set. One end of the power input shaft is connected to the rotating shaft. Three-phase terminals, which are connected to the stator via wires; The feature is that the three-phase wire terminal is installed on the end cover and located above the reducer; when viewed along the axial direction of the rotating shaft, a straight line passing through the rotation center of the power input shaft and the rotation center of the power output shaft is defined as a reference line, the reference line is set at an angle, and the three-phase wire terminal is basically located on the upper side of the reference line.

2. The motor assembly as claimed in claim 1, characterized in that, The mounting cavity is equipped with an oil-gas separation structure, which is located basically above the reference line.

3. The motor assembly as described in claim 2, characterized in that, The oil-gas separation structure includes a first partition, a second partition, and an exhaust valve. The first partition and the inner wall of the mounting cavity form an oil-gas separation chamber. The upper end of the oil-gas separation chamber has an opening and is connected to the exhaust valve. The lower end of the oil-gas separation chamber has an inlet and outlet opening. The second partition divides the oil-gas separation chamber into an oil-gas inlet channel and an oil return channel. The oil-gas inlet channel is closer to the reference line than the oil return channel. A gap is maintained between the upper end of the second partition and the upper end of the oil-gas separation chamber to connect the oil-gas inlet channel and the oil return channel. The inlet and outlet opening is divided by the second partition into two parts belonging to the oil-gas inlet channel and the oil return channel, respectively. The width of the oil-gas inlet channel at the inlet and outlet opening is greater than the width of the oil return channel at the inlet and outlet opening.

4. The motor assembly as described in claim 3, characterized in that, The gear set includes an input gear and an output gear. The input gear is connected to the power input shaft, and the output gear is connected to the power output shaft. The input gear and the output gear mesh. The first partition is arranged around the outer periphery of the one with the higher rotational center line of the input gear and the output gear.

5. The motor assembly as described in claim 4, characterized in that, The rotation center line of the input gear is higher than that of the output gear, and the transmission ratio between the input gear and the output gear is greater than 1; when viewed along the axial direction of the rotation shaft, the oil-gas separation structure is located on one side of the input gear in a direction perpendicular to the reference line.

6. The motor assembly as claimed in claim 5, characterized in that, The first partition has a through groove at one end near the inlet / outlet opening. When viewed along the axis of the rotation shaft, the through groove passes through both sides of the first partition in a direction perpendicular to the reference line. Along the axis of the rotation shaft, the width of the through groove is less than the width of the first partition.

7. The motor assembly as claimed in claim 5, characterized in that, Viewed along the axial direction of the rotation shaft, the extension direction of the lower end of the second partition does not intersect with the outer periphery of the output gear.

8. The motor assembly as claimed in claim 1, characterized in that, The power output shaft is located below the power input shaft.

9. An electric motorcycle, comprising: Frame; A body panel that at least partially covers the vehicle frame; The power battery is supported by the vehicle frame. A walking system, the walking system including a front walking wheel and a rear walking wheel, at least a portion of the front walking wheel and at least a portion of the rear walking wheel being located below the frame; The electric motorcycle is characterized in that it includes a motor assembly as described in any one of claims 1 to 8, the motor assembly is supported by the frame, the motor assembly is electrically connected to the power battery, and the rear wheel is drive-connected to the power output shaft.

10. The electric motorcycle as described in claim 9, characterized in that, The axle spacing between the front and rear wheels ranges from 1000mm to 1100mm, and the motor power in the motor assembly ranges from 1kW to 3kW.

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