A liquid-cooled motor with a speed reduction mechanism

Abstract

This utility model discloses a liquid-cooled motor with a reduction mechanism, comprising: a housing with an internal accommodating space; a motor mechanism disposed within the accommodating space, the motor mechanism including a rotor assembly and a stator assembly sleeved and connected, the space enclosed by the rotor assembly and stator assembly having a liquid-cooled chamber for accommodating coolant; and a reduction mechanism disposed within the accommodating space and drivingly connected to the rotor assembly, the output shaft of the reduction mechanism extending axially to an axial end rotatably connected to the housing, and the output shaft and the axial end of the housing being connected by a seal. This utility model utilizes the cooperation between the reduction mechanism and the seal to achieve a sealing effect, thereby reducing the influence of friction by a factor of the reduction ratio, thus reducing the influence of friction on the output torque by a factor of the reduction ratio, thereby avoiding the impact of friction on the working performance of the low-power liquid-cooled motor.

Description

Technical Field

[0001] This utility model relates to the field of liquid-cooled motor technology, and specifically to a liquid-cooled motor with a speed reduction mechanism. Background Technology

[0002] Liquid-cooled motors use circulating coolant to remove the heat generated by the motor, ensuring its normal operation. Compared to air-cooled motors, liquid-cooled motors have higher heat dissipation efficiency, effectively reducing the internal temperature of the motor, minimizing demagnetization, improving motor performance, thereby extending service life and enhancing operational stability and safety.

[0003] Liquid-cooled motors are used in numerous fields, including robotics, electric vehicles, electric motorcycles, electric bicycles, servers, communication equipment, and industrial applications, to ensure stable operation. During operation, the coolant inside a liquid-cooled motor may leak along the shaft, reducing its heat dissipation capacity, accelerating the aging of internal components, and degrading performance. Furthermore, the conductivity of the coolant can lead to electrical faults such as short circuits and leakage, while corrosive coolants can cause metal parts to rust and become damaged. Therefore, the sealing of the coolant in a liquid-cooled motor is crucial. In related technologies, oil seals are used on the rotor of liquid-cooled motors to achieve coolant sealing. However, during operation, there is significant friction between the oil seal and the rotor. While this has a smaller impact on high-power liquid-cooled motors, for low-power motors, the friction between the oil seal and the rotor reduces the motor's output torque, thus affecting its performance. Utility Model Content

[0004] The purpose of this utility model is to disclose a liquid-cooled motor with a reduction mechanism, which achieves a sealing effect by cooperating with the reduction mechanism and the sealing element, so as to reduce the influence of friction by multiple times according to the reduction ratio, thereby reducing the influence of friction on the output torque by multiple times, thus avoiding the influence of friction on the working performance of the low-power liquid-cooled motor.

[0005] To achieve the above objectives, this utility model discloses a liquid-cooled motor with a reduction gear mechanism, comprising:

[0006] The casing has an internal storage space.

[0007] The motor mechanism is located in the housing space. The motor mechanism includes a rotor assembly and a stator assembly that are sleeved and connected together. The space enclosed by the rotor assembly and the stator assembly is provided with a liquid cooling chamber for containing coolant.

[0008] The reduction mechanism is located in the housing space and is connected to the rotor assembly. The output shaft of the reduction mechanism extends axially to the axial end of the housing, which is rotatably connected to the housing. The output shaft and the axial end of the housing are connected by a seal.

[0009] As an optional implementation, the housing includes an outer sleeve, a first end cover, and a second end cover. The first end cover and the second end cover are disposed at both axial ends of the outer sleeve so that the three form an accommodating space. The motor mechanism and the reduction mechanism are disposed inside the outer sleeve, and the output shaft extends axially to be rotatably connected to the first end cover and the second end cover. The output shaft is connected to the first end cover and the second end cover by a seal.

[0010] As an optional implementation, the rotor assembly includes a rotor and a permanent magnet, the stator assembly includes a stator and a motor winding, the rotor, permanent magnet, motor winding and stator are sequentially nested, the liquid cooling chamber is located between the rotor and the stator, and the reduction mechanism is connected to the rotor drive.

[0011] As an alternative implementation, the two axial ends of the rotor and the two axial ends of the stator are connected by bearings, with the bearing near the first end cover fixed by a bearing cover plate and the other bearing fixed by a second end cover.

[0012] As an optional implementation, the rotor assembly and / or stator assembly are provided with cooling channels, the stator is provided with a liquid inlet and a liquid outlet, the cooling channels are connected to the liquid inlet and the liquid outlet through a liquid cooling chamber, and the liquid inlet and the liquid outlet pass through the housing.

[0013] As an alternative implementation, the cooling channel is located on the side wall of the rotor facing the permanent magnet, and / or the cooling channel is located on the side wall of the stator facing the motor winding.

[0014] As an optional implementation, the reduction mechanism includes a harmonic reducer, which includes a wave generator, a flexible wheel, and a rigid wheel. The harmonic reducer is located at the end of the motor mechanism near the first end cover. The wave generator is fixedly sleeved on the rotor, the flexible wheel is sleeved on the wave generator, and the end of the flexible wheel away from the wave generator is fixedly sleeved on the output shaft. The outer side wall of the end of the flexible wheel near the wave generator is provided with external teeth, and the inner side wall of the rigid wheel is provided with internal teeth that can mesh with the external teeth. The rigid wheel is fixed to the inner wall of the outer sleeve.

[0015] As an alternative implementation, one axial end of the output shaft is connected to the first end cap via a bearing and sealed via a seal, while the other axial end of the output shaft is connected to the rotor via a bearing and extends to be sealed to the second end cap via a seal.

[0016] As an optional implementation, a lubrication cavity is formed between the harmonic reducer and the motor mechanism. A through hole is provided at one end of the stator near the lubrication cavity to connect the lubrication cavity and the liquid cooling chamber. A filter element is installed at the through hole.

[0017] As an optional implementation, the second end cap has a base on the side facing away from the outer sleeve. The base is supported on the bottom of the housing, and the distance between the base and the second end cap is set.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The motor mechanism and the reduction mechanism are connected in the housing. The coolant in the motor mechanism is sealed by the cooperation between the reduction mechanism, the seals and the housing. This reduces the influence of friction by a factor of the reduction ratio, thus reducing the influence of friction on the output torque by a factor of the reduction ratio, thereby avoiding the impact of friction on the working performance of the low-power liquid-cooled motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the liquid-cooled motor with a speed reduction mechanism according to this utility model;

[0022] Figure 2 This is an axial sectional view of the liquid-cooled motor with a speed reduction mechanism according to this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the liquid-cooled motor harmonic removal reducer of this utility model;

[0024] Figure 4 This is a schematic diagram of the rotor structure of this utility model.

[0025] Explanation of key figure labels:

[0026] 1. Housing; 11. Accommodation space; 12. Outer sleeve; 13. First end cover; 14. Second end cover; 2. Motor mechanism; 21. Rotor assembly; 211. Rotor; 212. Permanent magnet; 22. Stator assembly; 221. Stator; 222. Motor winding; 23. Liquid cooling chamber; 24. Cooling channel; 25. Liquid inlet; 26. Liquid outlet; 3. Reduction mechanism; 31. Output shaft; 32. Wave generator; 33. Flexible wheel; 34. Rigid wheel; 35. Lubrication chamber; 4. Seal; 5. Bearing; 6. Bearing cover plate; 7. Filter; 8. Base. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0029] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0031] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0032] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0033] See Figure 1 and Figure 2This application provides a liquid-cooled motor with a reduction mechanism, including: a housing 1, a motor mechanism 2, and a reduction mechanism 3. The housing 1 has an accommodating space 11. The housing 1 has an axially extending structure, and its internal accommodating space is used to install the motor mechanism 2 and the reduction mechanism 3. The motor mechanism 2 and the reduction mechanism 3 are axially connected to the accommodating space, and the motor mechanism 2 and the reduction mechanism 3 are radially sealed to the housing 1.

[0034] The motor mechanism 2 is located in the accommodating space 11. The motor mechanism 2 includes a rotor assembly 21 and a stator assembly 22 that are sleeved and connected together. The space enclosed by the rotor assembly 21 and the stator assembly 22 is provided with a liquid-cooled chamber 23 for containing coolant. The motor mechanism 2 can be an inner rotor motor mechanism, in which the stator assembly 22 is sleeved outside the rotor assembly 21 and is radially sealed to the housing 1. The motor mechanism 2 can also be an outer rotor motor mechanism, in which the rotor assembly 21 is sleeved outside the stator assembly 22, is radially sealed to the housing 1, and is rotatable relative to the housing 1.

[0035] The reduction mechanism 3 is located in the receiving space 11 and is drivenly connected to the rotor assembly 21. The output shaft 31 of the reduction mechanism 3 extends axially to the axial end of the housing 1, and the output shaft 31 is connected to the axial end of the housing 1 by a seal 4. Since both the motor mechanism 2 and the reduction mechanism 3 are radially sealed to the housing 1, and the reduction mechanism 3 is axially driven to the motor mechanism 2, the possible leakage path of the coolant is axial. In the axial direction, the output shaft 31 is sealed to the axial end of the housing 1 by the seal 4, thereby achieving a coolant seal through the cooperation between the output shaft 31, the housing 1, and the seal 4, avoiding the risk of coolant leakage in the liquid-cooled motor. Furthermore, since the seal 4 is located between the housing 1 and the output shaft 31 of the reduction mechanism 3, the effect of rotational friction between the seal 4 and the output shaft 31 decreases proportionally with the reduction ratio, thus reducing the effect of friction on the output torque proportionally, thereby avoiding the impact of friction on the working performance of the low-power liquid-cooled motor.

[0036] It is worth noting that the embodiments and accompanying drawings of this application use an internal rotor motor mechanism as an example for illustration, but the structure of this application is also applicable to external rotor motors. The principle is the same, and the structure can be adapted by adjustment. Therefore, detailed descriptions are not provided in the embodiments of this application.

[0037] See Figure 1 and Figure 2The housing 1 includes an outer sleeve 12, a first end cap 13, and a second end cap 14. The first end cap 13 and the second end cap 14 are located at both axial ends of the outer sleeve 12, forming a receiving space 11. The motor mechanism 2 and the reduction mechanism 3 are located inside the outer sleeve 12, and the output shaft 31 extends axially to rotatably connect to the first end cap 13 and the second end cap 14. The output shaft 31 is connected to the first end cap 13 and the second end cap 14 via a seal 4. The internal space of the outer sleeve 12 is used for sealing and mounting the motor mechanism 2 and the reduction mechanism 3. The first end cap 13 seals and connects to one axially extended end of the output shaft 31, and the second end cap 14 limits and seals the other end of the motor mechanism 2, connecting to the other axial end of the output shaft 31. The seal 4 can be a common oil seal structure; of course, sealing rings, sealing rings, etc., can also be used for sealing.

[0038] In one or more embodiments, the rotor assembly 21 includes a rotor 211 and a permanent magnet 212, and the stator assembly 22 includes a stator 221 and a motor winding 222. The rotor 211, permanent magnet 212, motor winding 222, and stator 221 are sequentially nested together. A liquid-cooled chamber 23 is located between the rotor 211 and the stator 221, and the reduction mechanism 3 is drivenly connected to the rotor 211. Taking an internal rotor motor mechanism as an example, the rotor 211 is the central shaft, and the stator 221 is the outer shell. The shaft, permanent magnet 212, motor winding 222, and outer shell are sequentially nested together from the inside out. The liquid-cooled chamber 23 is located between the shaft and the outer shell, and the reduction mechanism 3 is drivenly connected to the shaft. The output shaft 31 of the reduction mechanism 3 passes through the shaft, and both axial ends of the output shaft 31 extend towards the first end cover 13 and the second end cover 14 relative to the shaft and are sealed together.

[0039] The axial ends of the rotor 211 and the axial ends of the stator 221 are connected by bearings 5. The bearing 5 near the first end cover 13 is fixed by a bearing cover plate 6, and the other bearing 5 is fixed by a second end cover 14. The fixed end of the bearing 5 is connected to the housing, and the rotating end of the bearing 5 is connected to the shaft, so as to achieve smooth rotation of the shaft relative to the housing by means of the bearing 5, and avoid contact or friction between the housing and the shaft, which would affect the rotation of the shaft. The bearing cover plate 6 and the second end cover 14 are fixed on the side of the bearing 5 near the housing to position the bearing 5 and prevent the bearing 5 from shifting and affecting the rotation of the shaft.

[0040] See Figure 2 and Figure 4The rotor assembly 21 and / or stator assembly 22 are provided with cooling channels 24. The stator 221 is provided with a liquid inlet 25 and a liquid outlet 26. The cooling channels 24 are connected to the liquid inlet 25 and the liquid outlet 26 via a liquid-cooled chamber 23. The liquid inlet 25 and the liquid outlet 26 pass through the housing 1. The liquid inlet 25 is used for the inflow of coolant, and the liquid outlet 26 is used for the outflow of coolant. The coolant flows into the liquid-cooled chamber 23 through the liquid inlet 25, and then flows through the cooling channels 24 to absorb heat and cool the liquid-cooled motor. After absorbing heat, the high-temperature coolant flows out through the liquid outlet 26 and enters the refrigeration module for heat dissipation and cooling, so that the coolant at a lower temperature can flow back into the liquid-cooled motor, thereby realizing the cyclic heat dissipation of the liquid-cooled motor. The refrigeration module can be a semiconductor refrigeration module, a magnetic refrigeration module, etc.

[0041] The liquid inlet 25 and liquid outlet 26 are located on the outer casing, and can be an integral part of the outer casing or an assembled structure. The liquid inlet 25 and liquid outlet 26 are radially arranged and extend out of the outer sleeve 12 to facilitate connection to the refrigeration module via a water circuit. The liquid inlet 25 and liquid outlet 26 may be equipped with a liquid pump to provide power for the flow of coolant between the liquid-cooled motor and the refrigeration module.

[0042] Cooling channels 24 may be provided only in stator assembly 22, only in rotor assembly 21, or both stator assembly 22 and rotor assembly 21, depending on heat dissipation requirements. In one or more embodiments, cooling channels 24 are provided on the sidewall of rotor 211 facing the permanent magnet 212, and / or, cooling channels 24 are provided on the sidewall of stator 221 facing the motor winding 222. Cooling channels 24 may be formed recessed in the sidewall of rotor 211 and / or stator 221, or protrusions may be provided at intervals on the sidewall of rotor 211 and / or stator 221 to form cooling channels 24 between the protrusions. For example, see [reference needed]. Figure 4 The outer wall of the rotating shaft has longitudinal and transverse cooling channels 24. The structure, shape and extension direction of the cooling channels 24 can be set according to the requirements, and can be wavy, inclined, etc.

[0043] For reduction mechanism 3, see [reference] Figure 2 One axial end of the output shaft 31 is connected to the first end cover 13 via a bearing 5 and sealed via a seal 4. The other axial end of the output shaft 31 is connected to the rotor 211 via a bearing 5 and extends to be sealed to the second end cover 14 via a seal 4.

[0044] One axial end of the output shaft 31 extends towards the first end cover 13 relative to the rotating shaft and is connected to the first end cover 13 via a bearing 5. A seal 4 is then installed to seal the connection and prevent coolant leakage. The fixed end of the bearing 5 is located near the first end cover 13, and the rotating end is located near the output shaft 31. The seal 4 can be a spring-loaded oil seal structure. Its fixed end seals the connection between the first end cover 13 and the fixed end of the bearing 5, while its elastic end seals the connection between the output shaft 31, thus ensuring smooth rotation of the output shaft 31 without affecting the sealing effect. The other axial end of the output shaft 31 is connected to the rotating shaft via a bearing 5. The rotational speed of the bearing 5 near the rotating shaft end is different from the rotational speed near the output shaft 31 end, ensuring a deceleration effect by giving the rotating shaft and output shaft 31 different rotational speeds. The other end of the output shaft 31 extends toward the second end cover 14 relative to the rotating shaft. The second end cover 14 has a fixing part extending toward the bearing 5 between the rotating shaft and the housing. The second end cover 14 and the output shaft 31 are sealed by a spring oil seal. The fixed end of the spring oil seal is sealed to the second end cover 14, and its elastic end is sealed to the output shaft 31, thereby ensuring the smooth rotation of the output shaft 31 without affecting the sealing effect.

[0045] In one or more embodiments, the reduction mechanism 3 includes a harmonic reducer, which includes a wave generator 32, a flexible wheel 33, and a rigid wheel 34. The harmonic reducer is located at the end of the motor mechanism 2 near the first end cover 13. The wave generator 32 is fixedly sleeved on the rotor 211, the flexible wheel 33 is sleeved on the wave generator 32, and the end of the flexible wheel 33 away from the wave generator 32 is fixedly sleeved on the output shaft 31. The outer side wall of the end of the flexible wheel 33 near the wave generator 32 is provided with external teeth, and the inner side wall of the rigid wheel 34 is provided with internal teeth that can mesh with the external teeth. The rigid wheel 34 is fixed to the inner wall of the outer sleeve 12.

[0046] When the motor mechanism 2 rotates the shaft via electromagnetic effect, it drives the wave generator 32 to rotate synchronously. The inner walls of the wave generator 32 and the flexible wheel 33 are pressed against each other. The flexible wheel 33 is a thin-walled structure capable of elastic deformation, and its inner diameter is slightly smaller than the long axis of the wave generator 32. The wave generator 32 is the component that causes the flexible wheel 33 to produce controllable elastic deformation. When the wave generator 32 and the flexible wheel 33 are assembled, the cross-section of the flexible wheel 33 is forced to change from the original circle to an ellipse. The teeth near the two ends of its long axis are fully engaged with the teeth of the rigid wheel 34, while the teeth near the two ends of its short axis are completely disengaged from the rigid wheel 34. The teeth in other sections of the circumference are in a transitional state of engagement and disengagement. When the rotating shaft drives the wave generator 32 to rotate, the deformation of the flexible wheel 33 continuously changes, causing the meshing state between the flexible wheel 33 and the rigid wheel 34 to continuously change, from meshing, meshing, disengaging, disengaging, and meshing again, repeating cyclically. This achieves the slow rotation of the flexible wheel 33 relative to the rigid wheel 34 in the opposite direction to the wave generator 32. Since the rigid wheel 34 is fixed inside the outer sleeve 12, the rotating shaft drives the wave generator 32 to rotate, and the flexible wheel 33, as the driven wheel, outputs rotation, driving the output shaft 31 to rotate, achieving the purpose of deceleration. This reduces the friction between the seal 4 and the output shaft 31 by a factor of the reduction ratio, thereby reducing the impact of friction on the output torque by a factor of the reduction ratio, making the sealing structure suitable for low-power liquid-cooled motors.

[0047] See Figure 2 and Figure 3 A lubrication chamber 35 is formed between the harmonic reducer and the motor mechanism 2. A through hole is provided at one end of the stator 221 near the lubrication chamber 35 to connect the lubrication chamber 35 and the liquid-cooled chamber 23. A filter element 7 is installed at the through hole. The lubrication chamber 35 is connected to the liquid-cooled chamber 23, allowing the coolant in the liquid-cooled chamber 23 to flow to the lubrication chamber 35. This utilizes coolant instead of lubricating oil, simplifying the lubrication structure of the liquid-cooled motor and saving costs. The filter element 7 can be a filter screen structure to filter impurities in the coolant and limit the flow rate of coolant from the liquid-cooled chamber 23 to the lubrication chamber 35, so as not to affect the heat dissipation effect and internal structure of the liquid-cooled motor.

[0048] In one or more embodiments, a base 8 is provided on the side of the second end cap 14 facing away from the outer sleeve 12. The base 8 is supported on the bottom of the housing 1, and the base 8 is spaced apart from the second end cap 14. The base 8 provides support and can stably support the liquid-cooled motor. The base 8 is hollowed out at the output shaft 31, which facilitates the connection of the load to the other axial end of the output shaft 31.

[0049] It should be noted that the base 8 is positioned to avoid the second end cap 14 and the output shaft 31, so as not to affect the rotation effect. In this embodiment, the base 8 is connected to the outer casing by a support column to achieve the purpose of avoiding these obstacles.

[0050] The above provides a detailed description of a liquid-cooled motor with a speed reduction mechanism disclosed in the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the liquid-cooled motor with a speed reduction mechanism and its core idea. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid-cooled electric machine having a speed reduction mechanism, characterized by, include: A housing, wherein the housing has an internal receiving space; The motor mechanism is located in the accommodating space. The motor mechanism includes a rotor assembly and a stator assembly that are sleeved and connected together. The space enclosed by the rotor assembly and the stator assembly is provided with a liquid cooling chamber for accommodating coolant. A speed reduction mechanism is disposed in the receiving space and drively connected to the rotor assembly. The output shaft of the speed reduction mechanism extends axially to an axial end rotatably connected to the housing, and the output shaft is connected to the axial end of the housing by a seal.

2. The liquid-cooled motor with a reduction gear as described in claim 1, characterized in that: The housing includes an outer sleeve, a first end cap, and a second end cap. The first end cap and the second end cap are disposed at both axial ends of the outer sleeve so that the three form the receiving space. The motor mechanism and the reduction mechanism are disposed inside the outer sleeve, and the output shaft extends axially to rotatably connect the first end cap and the second end cap. The output shaft is connected to the first end cap and the second end cap through the sealing element.

3. The liquid-cooled motor with a reduction gear as described in claim 2, characterized in that: The rotor assembly includes a rotor and a permanent magnet, the stator assembly includes a stator and a motor winding, the rotor, the permanent magnet, the motor winding and the stator are sequentially nested together, the liquid cooling chamber is located between the rotor and the stator, and the reduction mechanism is drivenly connected to the rotor.

4. The liquid-cooled motor with a reduction gear as described in claim 3, characterized in that: The two axial ends of the rotor and the two axial ends of the stator are connected by bearings. The bearing near the first end cover is fixed by a bearing cover plate, and the other bearing is fixed by the second end cover.

5. The liquid-cooled motor with a reduction gear mechanism according to claim 3, characterized in that: The rotor assembly and / or the stator assembly are provided with cooling channels. The stator is provided with a liquid inlet and a liquid outlet. The cooling channels are connected to the liquid inlet and the liquid outlet through the liquid cooling chamber. The liquid inlet and the liquid outlet pass through the housing.

6. The liquid-cooled motor with a reduction gear as described in claim 5, characterized in that: The cooling channel is located on the side wall of the rotor facing the permanent magnet, and / or the cooling channel is located on the side wall of the stator facing the motor winding.

7. The liquid-cooled motor with a reduction gear mechanism according to claim 3, characterized in that: The deceleration mechanism includes a harmonic reducer, which includes a wave generator, a flexible wheel, and a rigid wheel. The harmonic reducer is located at the end of the motor mechanism near the first end cover. The wave generator is fixedly sleeved on the rotor. The flexible wheel is sleeved on the wave generator. The end of the flexible wheel away from the wave generator is fixedly sleeved on the output shaft. The outer side wall of the end of the flexible wheel near the wave generator is provided with external teeth. The inner side wall of the rigid wheel is provided with internal teeth that can mesh with the external teeth. The rigid wheel is fixed to the inner wall of the outer sleeve.

8. The liquid-cooled motor with a reduction gear as described in claim 7, characterized in that: One axial end of the output shaft is connected to the first end cap via a bearing and sealed via the seal, and the other axial end of the output shaft is connected to the rotor via a bearing and extends to be sealed to the second end cap via the seal.

9. The liquid-cooled motor with a reduction gear mechanism according to claim 7, characterized in that: A lubrication cavity is formed between the harmonic reducer and the motor mechanism. A through hole is provided at one end of the stator near the lubrication cavity to connect the lubrication cavity and the liquid cooling chamber. A filter element is installed at the through hole.

10. The liquid-cooled motor with a reduction gear according to claim 2, characterized in that: The second end cap has a base on the side facing away from the outer sleeve. The base is supported on the bottom of the housing, and the base is spaced apart from the second end cap.

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