Two-in-one small-size high-rotating-speed electric motorcycle power system with motor and speed reducer arranged in middle

Abstract

The invention relates to the technical field of speed reducer assemblies, in particular to a two-in-one small-size high-rotating-speed electric motorcycle power system with a motor and a speed reducer arranged in the middle. The motor assembly comprises a motor shell and a motor shaft located in the center of the motor shell. The speed reducer assembly comprises a front shell, a rear shell, an input shaft, an output shaft, a chain wheel and a gear set; the gear set comprises a thin and high tooth gear I arranged on the input shaft and a thin and high tooth gear II arranged on the output shaft, and power of the input shaft is transmitted to the output shaft through the gear set so as to drive the chain wheel to rotate. The whole structure is more compact, the rear shell is provided with the ventilation valve, effective cooling, pressure relief and ventilation are achieved, local overheating is prevented, and meanwhile noise and vibration can be reduced; carburizing steel is adopted as a gear material, and the gear strength and precision are improved through a thin and high-tooth gear; the chain wheels are assembled through the hot charging technology, the maximum input torque is 40 N.m, the maximum input rotating speed is 8000 Rpm, and reliable transmission under the high rotating speed and large torque is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of reducer assemblies, and in particular to a small-volume, high-speed electric motorcycle power system in which a motor and a reducer are centrally mounted in a two-in-one structure. Background Art

[0002] With the development of the electric motorcycle industry, the performance requirements for electric motorcycle powertrains are increasing. However, there are many problems with existing electric motorcycle powertrains. Its large size limits the flexibility of the overall design and layout of electric motorcycles; the speed is limited, making it difficult to meet the needs of high-speed driving; the heat dissipation effect is poor, which easily leads to excessive internal temperature, thereby affecting the life and performance of components; the transmission reliability is low, and it is easy to fail under high speed and high torque conditions, affecting driving safety. For example, the electric motorcycle motor assembly disclosed by China Authorization Announcement No. CN220107709U shows the structure of the motor assembly and the reducer assembly, but the related problems have not been completely solved. First, poor gear meshing and frame resonance lead to large noise and vibration; second, problems such as insufficient heat dissipation, lubrication failure, and oil leakage make the powertrain easy to heat up, reducing its performance and reliability; third, in the pursuit of a sufficiently small volume, it is difficult to take into account both high speed and high torque, and it cannot meet market demand. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a small-volume, high-speed electric motorcycle power system with a motor and a reducer centrally mounted in two-in-one.

[0004] The technical solution adopted by the present invention is as follows: A small-volume, high-speed electric motorcycle power system with a motor and a reducer centrally mounted in one, comprising a motor assembly and a reducer assembly that are compactly arranged as a whole, wherein the motor assembly comprises a motor housing and a motor shaft located at the center of the motor housing; The reducer assembly includes a front housing, a rear housing, an input shaft, an output shaft, a sprocket and a gear set, wherein: The rear housing has a central hole I in the middle thereof which matches the input shaft, and a limit groove I which matches the output shaft is arranged outwardly along the central hole I on the outside thereof; a breathable valve I and a breathable valve II are arranged on the outside thereof respectively facing the motor and the gear set, for cooling, releasing pressure and ventilating; The front housing has a center hole II in the middle thereof which matches the output shaft, and a limit groove II which matches the input shaft is arranged outwardly along the center hole II on the inner side thereof; An input shaft, the rear end of which is connected to the motor shaft and passes through the rear housing forward, and the front end of which abuts against the limiting groove I of the front housing; The output shaft, whose rear end abuts against the limit groove II, and whose front end meshes with the input shaft through the gear set and penetrates the front housing forward; a sprocket, which is fixed to the end of the output shaft by a lock nut; The gear set includes a fine high-tooth gear I arranged on the input shaft and a fine high-tooth gear II arranged on the output shaft. The fine high-tooth gear I and the fine high-tooth gear II are meshed with each other. The power of the input shaft is transmitted to the output shaft through the gear set, thereby driving the sprocket to rotate.

[0005] This technical solution adopts a compact integrated structure, and the motor assembly and the reducer assembly are compactly arranged front and back; in the reducer assembly, the rear housing and the front housing are precisely matched through the center hole and the limit groove to ensure the accurate position of the components. The input shaft is connected to the motor shaft, and the power is transmitted to the output shaft through the gear set, and then drives the sprocket to rotate; carburized steel is used as gear material, fine high-tooth gears, gear grinding and corrugation detection are used to improve the strength and accuracy of the gear and reduce noise; hot-mounted sprocket output, the maximum input torque is 40N.m, and the maximum input speed is 8000Rpm, which effectively solves the problems of heat dissipation, lubrication, noise and maintenance difficulties of similar products, and improves the performance and reliability of the electric motorcycle powertrain. Specifically, the motor assembly and the reducer assembly are compactly arranged front to back, making the electric motorcycle more compact and lightweight as a whole; the center hole I of the rear housing cooperates with the input shaft, and the center hole II of the front housing cooperates with the output shaft. At the same time, the limiting groove I of the rear housing and the limiting groove II of the front housing respectively limit the output shaft and the input shaft, reducing the vibration and noise caused by loose components; the fine high-tooth gear I in the gear set is arranged on the input shaft, and the fine high-tooth gear II is arranged on the output shaft, and the two are meshed with each other. The two fine high-tooth gears reduce the diameter of the gear while ensuring the strength of the gear, thereby achieving a larger transmission ratio in a limited space; during the operation of the powertrain, the motor and the gear set will generate a large amount of heat, and the internal pressure will also increase. The outer side of the rear housing is respectively provided with a breather valve I and a breather valve II facing the motor and the gear set to achieve the functions of cooling, relieving pressure and ventilation, so as to adapt to the high-speed and high-torque working requirements of the electric motorcycle.

[0006] In addition, the small-volume, high-speed electric motorcycle power system proposed in the present invention with a motor and a reducer in a centrally mounted two-in-one configuration may also have the following additional technical features: According to one embodiment of the present invention, an end cover is provided on the outer side of the motor housing, and the end cover is fixed to the center of the motor housing by bolts.

[0007] In the present technical solution, heat dissipation fins are arranged on the end cover, and by cooperating with the motor housing, the end cover enables heat to be dissipated in time, thereby preventing the motor from being affected in performance and life due to overheating.

[0008] According to an embodiment of the present invention, the two sides of the central hole I of the rear shell are respectively provided with a limiting groove I and a mounting hole I, and the air vent valve I extends inward from the mounting hole I to the motor housing.

[0009] In the present technical solution, the air valve I extends inward from the mounting hole I to the motor housing, so that the air valve I can be directly close to the high-temperature area inside the motor housing; the air valve I discharges the hot air in the motor housing in time and introduces fresh air from the outside to form effective air circulation, thereby accelerating the heat dissipation of the motor and preventing the motor from being damaged due to overheating.

[0010] According to one embodiment of the present invention, a circle of retaining edges is further provided on the outer side of the rear shell body, and the retaining edges are arranged around the center hole I and the limiting groove I; a mounting hole II is horizontally arranged along the side of the retaining edge, and the air vent valve II extends inward from the mounting hole to the limiting groove I, and two staggered arc-shaped baffles are arranged in the limiting groove I.

[0011] In the present technical solution, the air valve II extends inward from the mounting hole II to the limiting groove I, so that the air valve II can be directly close to the high-temperature area inside the limiting groove I; the two staggered arc baffles arranged in the limiting groove I guide the airflow to form a specific flow path in the limiting groove I, increase the contact area between the airflow and the internal gear set, improve the heat dissipation efficiency, and prevent local overheating of the reducer assembly.

[0012] According to one embodiment of the present invention, the staggered arc baffle forms a circuitous channel through multiple layers of arcuate retaining edges, and utilizes the gaps between the multiple layers of arcuate retaining edges to control the gas flow rate, extend the gas flow path, and prevent sudden pressure changes.

[0013] In this technical solution, the staggered arc baffles are also used to reduce the noise and vibration caused by gas flow; the smooth gas flow can reduce the generation of turbulence and eddies, thereby reducing the source of noise. When the gas passes through the gap, it will encounter a certain resistance, thereby balancing the pressure changes during the gas flow process and preventing turbulence and eddies caused by sudden changes in flow velocity.

[0014] According to an embodiment of the present invention, the input shaft is further provided with bearings I, which are respectively arranged on both sides of the fine high-tooth gear I, and the fine high-tooth gear I is respectively connected to the limit groove I and the center hole I through the bearings I.

[0015] This technical solution sets the bearing I on both sides of the fine high-tooth gear I and connects it with the limit groove I and the center hole I, making full use of the limited space on the input shaft and realizing a compact structure. The compact structure helps to reduce the volume and weight of the entire powertrain.

[0016] According to one embodiment of the present invention, a bearing II is further provided on the output shaft, and the bearing II is respectively provided on both sides of the fine high-tooth gear II, and the fine high-tooth gear II is respectively connected to the limit groove II and the center hole II through the bearing II.

[0017] This technical solution sets the bearing II on both sides of the fine high-tooth gear II and connects it with the limit groove II and the center hole II, making full use of the limited space on the output shaft to achieve a compact structure. The compact structure helps to reduce the volume and weight of the powertrain.

[0018] According to one embodiment of the present invention, the gear sets all have a carburized hardened layer, and the overlap between the fine high tooth gear I and the fine high tooth gear II reaches more than 2.3, wherein the pitch circle pressure angle is 14-21°, the tooth top height coefficient is 1.3-1.4, and the module is 1-4.

[0019] In this technical solution, the carburized hardened layer can withstand higher contact stress and wear, thereby extending the service life of the gear; the gears with a contact ratio of more than 2.3 are high-contact gears, which can reduce the impact and vibration of the gear transmission and make the transmission smoother; the pitch circle pressure angle is in the range of 14-21°, ensuring that the gears have good contact performance and transmission efficiency when meshing, and also helps to reduce gear wear and noise; the tooth top height coefficient is in the range of 1.3-1.4, which can optimize the gear meshing process and reduce the interference between the tooth top and the tooth root.

[0020] According to one embodiment of the present invention, the sprocket is assembled with the output shaft by a heat-fitting process, and the maximum input torque of the sprocket is 40 N.m, and the maximum input speed is 8000 Rpm.

[0021] In this technical solution, the hot-loading process uses the characteristics of metal expansion and contraction. The sprocket is first heated to a certain temperature to expand its inner diameter, and then the sprocket is quickly sleeved on the output shaft; as the sprocket cools, its inner diameter shrinks, forming an interference fit with the output shaft, thereby achieving a tight connection. The high-strength material of the sprocket enables it to withstand a maximum input torque of 40N·m, and the processing technology also ensures that its maximum input speed can reach 8000Rpm.

[0022] According to an embodiment of the present invention, the gear center distance between the rear housing and the front housing is 51 mm, forming an integral structure with small volume and high rotation speed.

[0023] In this technical solution, the gear center distance of 51mm is a smaller gear center distance, which makes the space layout between the front and rear shells more compact, making it more suitable for application scenarios with strict space requirements, such as electric motorcycle power equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) Compact and lightweight structure: The motor assembly and reducer assembly are compactly arranged front and back, the rear housing and the front housing are precisely matched through the center hole and the limit groove, and the 51mm gear center distance makes the overall structure more compact, reducing the volume and weight of the powertrain; (2) Good heat dissipation and noise reduction: The rear shell is equipped with a breathable valve, which cooperates with the baffle edge and staggered arc baffle to achieve effective temperature reduction, pressure release and ventilation, prevent local overheating, and reduce the noise and vibration generated by gas flow; (3) Excellent transmission performance: Carburized steel is used as the gear material and fine high-tooth gears are used to improve the gear strength and precision; the sprocket is assembled through the hot-loading process, with a maximum input torque of 40N.m and a maximum input speed of 8000Rpm, ensuring reliable transmission under high speed and high torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is one of the stereograms of the present invention.

[0026] Figure 2 It is two of the three-dimensional diagrams of the present invention.

[0027] Figure 3 It is the front view of the present invention.

[0028] Figure 4 It is a side view of the present invention.

[0029] Figure 5 It is an exploded view of the present invention.

[0030] Figure 6 It is a cross-sectional view of the present invention.

[0031] Figure 7 It is a side view of the gear set.

[0032] Figure 8 It is a three-dimensional diagram of the gear set.

[0033] Fig. 9 It is one of the three-dimensional images of the rear housing.

[0034] Fig.10 This is the second stereoscopic view of the rear housing.

[0035] Fig.11 It is one of the three-dimensional images of the front housing.

[0036] Fig.12 This is the second stereogram of the front housing.

[0037] In the figure: 1. Motor housing; 2. Rear housing; 21. Breathing valve I; 22. Breathing valve II; 23. Mounting hole I; 24. Mounting hole II; 25. Center hole I; 26. Limiting groove I; 3. Front housing; 31. Center hole II; 32. Limiting groove II; 4. Sprocket; 5. Output shaft; 6. Locking nut; 7. End cover; 8. Input shaft; 9. Fine high-tooth gear I; 10. Bearing I; 11. Fine high-tooth gear II; 12. Bearing II; 13. Limiting block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1 like Figures 1 to 6 As shown, this embodiment provides a small-volume high-speed electric motorcycle power system with a motor and a reducer centrally mounted two-in-one, including a motor assembly and a reducer assembly that are compactly arranged as a whole in the front and rear, and the motor assembly includes a motor housing 1 and a motor shaft located at the center of the motor housing 1; The reducer assembly includes a front housing 3, a rear housing 2, an input shaft 8, an output shaft 5, a sprocket 4 and a gear set, wherein: The rear housing 2 has a central hole Ⅰ25 in the middle thereof which matches the input shaft 8, and a limit groove Ⅰ26 which matches the output shaft 5 is arranged outwardly along the central hole Ⅰ25; a breathable valve Ⅰ21 and a breathable valve Ⅱ22 are arranged on the outer side thereof respectively toward the motor and the gear set for cooling, releasing pressure and ventilating. Figures 9 and 10 As shown; The front housing 3 has a center hole II31 in the middle thereof which matches the output shaft 5, and a limiting groove II32 which matches the input shaft 8 is arranged outside along the center hole II31. Figure 11 to Figure 12 As shown; The input shaft 8 has a rear end connected to the motor shaft and passes through the rear housing 2 forward, and a front end thereof abuts against the limiting groove Ⅰ26 of the front housing 3; The output shaft 5, whose rear end abuts against the limit groove II 32, and whose front end meshes with the input shaft 8 through a gear set and penetrates the front housing 3 forward; A sprocket 4 is fixed to the end of an output shaft 5 by a locking nut 6; The gear set includes a fine high-tooth gear I9 arranged on the input shaft 8 and a fine high-tooth gear II11 arranged on the output shaft 5. The fine high-tooth gear I9 and the fine high-tooth gear II11 are meshed with each other. The power of the input shaft 8 is transmitted to the output shaft 5 through the gear set, thereby driving the sprocket 4 to rotate. Figures 7 and 8 shown.

[0040] like Figures 1 to 6As shown, this technical solution adopts a compact integrated structure, and the motor assembly and the reducer assembly are compactly arranged front and back; in the reducer assembly, the rear housing 2 and the front housing 3 are precisely matched through the center hole and the limit groove to ensure the accurate position of the components. The input shaft 8 is connected to the motor shaft, and the power is transmitted to the output shaft 5 through the gear set, and then drives the sprocket 4 to rotate; carburized steel is used as the gear material, fine high-tooth gears, gear grinding and corrugation detection are used to improve the strength and accuracy of the gear and reduce noise; the hot-mounted sprocket 4 outputs, the maximum input torque is 40N.m, and the maximum input speed is 8000Rpm, which effectively solves the problems of heat dissipation, lubrication, noise and maintenance difficulties of similar products, and improves the performance and reliability of the electric motorcycle powertrain. Specifically, the motor assembly and the reducer assembly are compactly arranged front and back, making the electric motorcycle more compact and lightweight as a whole; the center hole Ⅰ25 of the rear housing 2 cooperates with the input shaft 8, and the center hole Ⅱ31 of the front housing 3 cooperates with the output shaft 5. At the same time, the limiting groove Ⅰ26 of the rear housing 2 and the limiting groove Ⅱ32 of the front housing 3 respectively limit the output shaft 5 and the input shaft 8, reducing the vibration and noise caused by loose components; the fine high-tooth gear Ⅰ9 in the gear set is arranged on the input shaft 8, and the fine high-tooth gear Ⅱ11 is arranged on the output shaft 5, and the two are meshed with each other. The two fine high-tooth gears reduce the diameter of the gear while ensuring the strength of the gear, thereby achieving a larger transmission ratio in a limited space; during the operation of the powertrain, the motor and the gear set will generate a large amount of heat, and the internal pressure will also increase. The outer side of the rear housing 2 is respectively provided with a breathable valve Ⅰ21 and a breathable valve Ⅱ22 facing the motor and the gear set to achieve the functions of cooling, relieving pressure and ventilation, and adapt to the high-speed and high-torque working requirements of the electric motorcycle.

[0041] In addition, the small-volume, high-speed electric motorcycle power system proposed in the present invention with a motor and a reducer in a centrally mounted two-in-one configuration may also have the following additional technical features: According to one embodiment of the present invention, an end cover 7 is disposed on the outer side of the motor housing 1 , and the end cover 7 is fixed to the center of the motor housing 1 by bolts.

[0042] In the present technical solution, heat dissipation fins are arranged on the end cover 7. By cooperating with the motor housing 1, the end cover 7 allows the heat to be dissipated in time, thereby preventing the motor from being affected in performance and life due to overheating.

[0043] According to an embodiment of the present invention, the two sides of the central hole Ⅰ25 of the rear housing 2 are respectively provided with a limiting groove Ⅰ26 and a mounting hole Ⅰ23, and the air valve Ⅰ21 extends inward from the mounting hole Ⅰ23 to the motor housing 1.

[0044] In the present technical solution, the air valve Ⅰ21 extends inward from the mounting hole Ⅰ23 to the motor housing 1, so that the air valve Ⅰ21 can be directly close to the high-temperature area inside the motor housing 1; the air valve Ⅰ21 timely discharges the hot air in the motor housing 1 and introduces fresh air from the outside to form effective air circulation, thereby accelerating the heat dissipation of the motor and preventing the motor from being damaged due to overheating.

[0045] According to one embodiment of the present invention, a circle of retaining edges is further provided on the outer side of the rear shell body 2, and the retaining edges are arranged around the central hole Ⅰ25 and the limiting groove Ⅰ26; a mounting hole Ⅱ24 is horizontally arranged along the side of the retaining edge, and the air vent valve Ⅱ22 extends inward from the mounting hole to the limiting groove Ⅰ26, and two staggered arc-shaped baffles are arranged in the limiting groove Ⅰ26.

[0046] In this technical solution, the breathable valve II22 extends inward from the mounting hole II24 to the limit groove I26, so that the breathable valve II22 can be directly close to the high temperature area inside the limit groove I26; the two staggered arc baffles set in the limit groove I26 guide the airflow to form a specific flow path in the limit groove I26, increase the contact area between the airflow and the internal gear set, improve the heat dissipation efficiency, and prevent local overheating of the reducer assembly. The breathable valve is built with a polymer breathable membrane, which is breathable but not water-permeable. When the internal and external pressures are large, the internal gas is partially discharged outside the machine.

[0047] According to one embodiment of the present invention, the staggered arc-shaped baffle forms a circuitous channel through multiple layers of arc-shaped baffles, and utilizes the gaps between the multiple layers of arc-shaped baffles to control the gas flow rate, extend the gas flow path, and prevent sudden pressure changes.

[0048] In this technical solution, the staggered arc baffles are also used to reduce the noise and vibration caused by gas flow; the smooth gas flow can reduce the generation of turbulence and eddies, thereby reducing the source of noise. When the gas passes through the gap, it will encounter a certain resistance, thereby balancing the pressure changes during the gas flow process and preventing turbulence and eddies caused by sudden changes in flow velocity.

[0049] According to one embodiment of the present invention, the input shaft 8 is further provided with a bearing Ⅰ10, and the bearing Ⅰ10 is respectively arranged on both sides of the fine high-tooth gear Ⅰ9, and the fine high-tooth gear Ⅰ9 is connected to the limiting groove Ⅰ26 and the center hole Ⅰ25 through the bearing Ⅰ10.

[0050] This technical solution arranges the bearings Ⅰ10 on both sides of the fine high-tooth gear Ⅰ9 and connects them with the limit groove Ⅰ26 and the center hole Ⅰ25, making full use of the limited space on the input shaft 8 and realizing a compact structure. The compact structure helps to reduce the volume and weight of the entire powertrain.

[0051] According to one embodiment of the present invention, the output shaft 5 is further provided with a bearing II12, and the bearing II12 is respectively arranged on both sides of the fine high-tooth gear II11, and the fine high-tooth gear II11 is respectively connected to the limiting groove II32 and the center hole II31 through the bearing II12.

[0052] This technical solution sets the bearing II12 on both sides of the fine high-tooth gear II11 and connects it with the limit groove II32 and the center hole II31, making full use of the limited space on the output shaft 5 to achieve a compact structure. The compact structure helps to reduce the volume and weight of the powertrain.

[0053] According to one embodiment of the present invention, the gear sets all have a carburized hardened layer, and the overlap between the fine high tooth gear Ⅰ9 and the fine high tooth gear Ⅱ11 reaches more than 2.3, wherein the pitch circle pressure angle is 14-21°, the tooth top height coefficient is 1.3-1.4, and the module is 1-4.

[0054] In this technical solution, the carburized hardened layer can withstand higher contact stress and wear, thereby extending the service life of the gear; the gears with a contact ratio of more than 2.3 are high-contact gears, which can reduce the impact and vibration of the gear transmission and make the transmission smoother; the pitch circle pressure angle is in the range of 14-21°, ensuring that the gears have good contact performance and transmission efficiency when meshing, and also helps to reduce gear wear and noise; the tooth top height coefficient is in the range of 1.3-1.4, which can optimize the gear meshing process and reduce the interference between the tooth top and the tooth root.

[0055] According to an embodiment of the present invention, the sprocket 4 is assembled with the output shaft 5 by a heat-fitting process, and the maximum input torque of the sprocket 4 is 40 N.m, and the maximum input rotation speed is 8000 Rpm.

[0056] In this technical solution, the hot-loading process utilizes the characteristics of metal expansion and contraction. The sprocket 4 is first heated to a certain temperature to expand its inner diameter, and then the sprocket 4 is quickly sleeved on the output shaft 5. As the sprocket 4 cools, its inner diameter shrinks, forming an interference fit with the output shaft 5, thereby achieving a tight connection. The high-strength material of the sprocket 4 enables it to withstand a maximum input torque of 40N•m, and the processing technology also ensures that its maximum input speed can reach 8000Rpm.

[0057] According to an embodiment of the present invention, the gear center distance between the rear housing 2 and the front housing 3 is 51 mm, forming an integral structure with small volume and high rotation speed.

[0058] In this technical solution, the gear center distance of 51 mm is a smaller gear center distance, which makes the spatial layout between the front and rear housings 2 more compact, making it more suitable for application scenarios with strict space requirements, such as electric motorcycle power equipment.

[0059] The usage process of the above embodiment is as follows: like Figures 1 to 12 As shown, after the motor assembly is started, the motor shaft in the motor housing 1 starts to rotate; since the rear end of the input shaft 8 is connected to the motor shaft, the input shaft 8 also rotates accordingly; the fine high-tooth gear I9 on the input shaft 8 rotates accordingly, and transmits power to the output shaft 5 by meshing with the fine high-tooth gear II11 on the output shaft 5; the output shaft 5 starts to rotate after obtaining power, and drives the sprocket 4 fixed at the front end by the locking nut 6 to rotate; during the power transmission process, the fine high-tooth gear I9 and the fine high-tooth gear II11 in the gear set ensure smooth and efficient transmission; at the same time, the rear housing 2 and the front housing 3 are precisely matched through the center hole and the limit groove to ensure the accurate position of the components and reduce vibration and noise; During operation, when the heat generated by the motor and the gear set and the internal pressure increase, the breathable valve I21 and the breathable valve II22 on the rear housing 2 play a role in achieving cooling, pressure relief and ventilation, ensuring that the power assembly works at a suitable temperature and pressure; In addition, the bearings on the input shaft 8 and the output shaft 5 respectively support the fine high-tooth gear Ⅰ9 and the fine high-tooth gear Ⅱ11 to ensure stable rotation of the gear set; the sprocket 4 is tightly connected to the output shaft 5 through a heat-fitting process, which can withstand high torque and high speed to ensure the reliability of power transmission; the entire powertrain structure is compact and efficient, and can adapt to the high-speed and high-torque working requirements of the electric motorcycle.

Claims

1. A small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in one, characterized in that: The invention comprises a motor assembly and a reducer assembly which are compactly arranged as a whole in the front and rear directions, wherein the motor assembly comprises a motor housing (1) and a motor shaft located at the center of the motor housing (1); The reducer assembly comprises a front housing (3), a rear housing (2), an input shaft (8), an output shaft (5), a sprocket (4) and a gear set, wherein: The rear housing (2) has a central hole I (25) in the middle thereof which matches the input shaft (8), and a limit groove I (26) which matches the output shaft (5) is arranged outwardly along the central hole I (25); a breathable valve I (21) and a breathable valve II (22) are arranged on the outer side thereof respectively facing the motor and the gear set, for cooling, releasing pressure and allowing ventilation; The front housing (3) has a center hole II (31) in the center thereof which matches the output shaft (5), and a limit groove II (32) which matches the input shaft (8) is arranged outside the center hole II (31) on the inner side thereof; An input shaft (8), the rear end of which is connected to the motor shaft and passes through the rear housing (2) forward, and the front end of which abuts against the limiting groove I (26) of the front housing (3); The output shaft (5) has a rear end that abuts against the limit groove II (32), and a front end that meshes with the input shaft (8) through a gear set and penetrates the front housing (3) forwardly; A sprocket (4) fixed to the end of the output shaft (5) by a locking nut (6); The gear set comprises a fine high-tooth gear I (9) arranged on the input shaft (8) and a fine high-tooth gear II (11) arranged on the output shaft (5). The fine high-tooth gear I (9) and the fine high-tooth gear II (11) are meshed with each other. The power of the input shaft (8) is transmitted to the output shaft (5) through the gear set, thereby driving the sprocket (4) to rotate.

2. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: An end cover (7) is arranged on the outside of the motor housing (1), and the end cover (7) is fixed to the center of the motor housing (1) by means of bolts.

3. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The two sides of the central hole I (25) of the rear housing (2) are respectively provided with a limiting groove I (26) and a mounting hole I (23), and the air vent valve I (21) extends inwardly from the mounting hole I (23) to the motor housing (1).

4. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The outer side of the rear shell (2) is also provided with a circle of retaining edge, which is arranged around the central hole I (25) and the limiting groove I (26); a mounting hole II (24) is horizontally arranged along the side of the retaining edge, and the air vent valve II (22) extends inwardly from the mounting hole to the limiting groove I (26), and two staggered arc-shaped retaining plates are arranged in the limiting groove I (26).

5. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 4, characterized in that: The staggered arc-shaped baffle forms a circuitous channel through multiple layers of arc-shaped ribs, and utilizes the gaps between the multiple layers of arc-shaped ribs to control the gas flow rate, extend the gas flow path, and prevent sudden pressure changes.

6. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The input shaft (8) is also provided with a bearing I (10), which is respectively arranged on both sides of the fine high-tooth gear I (9), and the fine high-tooth gear I (9) is respectively connected to the limit groove I (26) and the center hole I (25) through the bearing I (10).

7. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The output shaft (5) is also provided with a bearing II (12), which is respectively arranged on both sides of the fine high-tooth gear II (11), and the fine high-tooth gear II (11) is respectively connected to the limit groove II (32) and the center hole II (31) through the bearing II (12).

8. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The gear sets all have a carburized hardened layer, and the overlap between the fine high-tooth gear I (9) and the fine high-tooth gear II (11) reaches more than 2.3, wherein the pitch circle pressure angle is 14-21°, the tooth top height coefficient is 1.3-1.4, and the module is 1-4.

9. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The sprocket (4) is assembled with the output shaft (5) by means of a heat-fitting process, and the maximum input torque of the sprocket (4) is 40 Nm, and the maximum input rotation speed is 8000 Rpm.

10. The small-volume, high-speed electric motorcycle power system with a motor and a reducer installed in two-in-one as claimed in claim 1, characterized in that: The gear center distance between the rear housing (2) and the front housing (3) is 51 mm, forming an integral structure with a small volume and high rotation speed.

Images