Water-cooled motor of electric automobile

Abstract

The invention discloses a water-cooled motor of an electric automobile, relates to the technical field of water-cooled motors, and solves the problems that electric sparks and electric arcs are easy to generate due to contact friction between a brush system and a rotor in the motor, the generated electric sparks and electric arcs are difficult to process in time by a water-cooled pipeline at a relatively long distance, and the accident rate is relatively high. The water-cooled motor of the electric vehicle comprises a motor shell, the electrical box system is mounted on one side of the top of the motor shell through screws; the stator and rotor assembly is arranged in the center of the interior of the motor shell; and the brushed water cooling structure is connected with the stator and rotor assembly and extends to the outer side of the motor shell. According to the invention, the cooling liquid can be driven to be transmitted to the motor stator, the motor rotor and the outer side of the brushed system in an extrusion injection manner through the acting force during the operation of the motor, and the motor stator and the brushed system in the operation state are indirectly cooled, so that the probability of generating electric sparks and electric arcs of the motor is reduced, and the service life of the motor is prolonged. And the safety when the motor is assembled in the electric vehicle for use is improved.

Description

Technical Field

[0001] This invention relates to the field of water-cooled motor technology, specifically to a water-cooled motor for electric vehicles. Background Technology

[0002] Water-cooled motors are a type of motor that primarily uses water as a cooling medium. This allows for more effective heat dissipation, ensuring stable performance even under high loads. Furthermore, compared to fan cooling, water cooling systems offer higher heat dissipation efficiency, reducing energy consumption and contributing to energy conservation and environmental protection.

[0003] Due to the advantages of water-cooled motors, such as efficient heat dissipation, existing electric vehicles are generally equipped with water-cooled motors, replacing traditional air-cooled motors.

[0004] However, this water-cooled motor has the following drawbacks in practical use: 1. In actual use, existing water-cooled motors, driven by current and magnetic fields, generate a large amount of high-temperature gas due to the continuous flow of current. This gas accumulates within the stator and rotor, affecting the motor's normal operation. Traditional water-cooled motors typically use cooling pipes to deliver coolant to the stator and rotor's operating space, achieving heat dissipation through non-contact contact between the high-temperature gas and the coolant. However, during operation, the stator and rotor of a water-cooled motor also require a brush system to alter the alternating magnetic field, driving the motor to rotate continuously. The contact friction between the brush system and the rotor can easily generate electric sparks and arcs. The relatively long distances of the water-cooling pipes make it difficult to promptly handle these sparks and arcs, resulting in a higher accident rate. 2. Existing water-cooled motors, when actually installed in electric vehicles, provide poor cooling, especially during prolonged operation. The side of the motor closer to its cooling structure (usually a radiator or water pump) dissipates heat normally, while the side further away from the cooling structure overheats significantly, severely impacting the motor's lifespan and the normal operation of the electric vehicle. Summary of the Invention

[0005] The purpose of this invention is to provide a water-cooled motor for electric vehicles to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: This invention provides a water-cooled motor for an electric vehicle, comprising: a motor housing; an electrical box system mounted on the top side of the motor housing by screws; a stator and rotor assembly disposed at the center inside the motor housing; and a brushed water-cooling structure connected to the stator and rotor assembly and extending to the outside of the motor housing. The brushed water-cooling structure includes: a rotor metal rod connected to the stator and rotor assembly and extending to the outside of the motor housing; a brush system installed on the outside of the rotor metal rod and connected to the stator and rotor assembly; a pressurized water-cooling assembly connected to the bottom of the rotor metal rod; an annular water-cooling cylinder sleeved on the outside of the rotor metal rod and communicating with the pressurized water-cooling assembly; guide pipes connected to the upper and lower sides of the annular water-cooling cylinder; and an annular cooling pipe connected to the guide pipes and penetrating the brush system. The annular water-cooling cylinder is located on the side of the brush system, and the electrical box system is electrically connected to the stator and rotor assembly and the brush system respectively.

[0007] As a preferred embodiment of the present invention, the motor housing includes: an intermediate housing; a top cover connected to the top of the intermediate housing by screws; and a sealing bottom cover installed on the outer side of the bottom of the intermediate housing by screws. The intermediate outer shell contains a stator and rotor assembly.

[0008] In a preferred embodiment of the present invention, an intermediate sealing ring is provided on one side of the intermediate outer shell located inside the sealing bottom cover and installed on the outside of the rotor metal rod. A sealing plate is provided on the outer side of the intermediate sealing ring, located on the inner wall of the intermediate outer shell. Two sealing plates are provided. Among them, an outer sealing ring is provided between the two sealing plates, located outside the pressurized water cooling assembly. Multiple outer sealing rings are provided, and a rotor metal rod is provided through the interior of the middle sealing ring.

[0009] In a preferred embodiment of the present invention, the stator and rotor assembly includes: main magnetic poles disposed inside the intermediate housing and arranged in a ring; excitation windings sleeved on the outside of the main magnetic poles; commutating poles installed inside the intermediate housing and located between two adjacent main magnetic poles; armature cores disposed inside the plurality of main magnetic poles and commutating poles; winding slots formed at an eccentric position inside the armature cores; and armature windings disposed inside the winding slots and extending to the outside of the armature cores. The armature core has a rotor metal rod installed through its center, and the armature winding is electrically connected to the brush system.

[0010] In a preferred embodiment of the present invention, the main magnetic pole is composed of multiple thin steel plates, each with a thickness of 1 mm, and the commutating pole is composed of an outer commutating winding and an inner commutating core, the commutating core being composed of multiple thin steel plates. The main magnetic pole and the commutation pole are both electrically connected to the electrical box system.

[0011] In a preferred embodiment of the present invention, an agitating fan blade located outside the sealing plate is mounted on the outer side of the bottom of the rotor metal rod, and the agitating fan blade is movably disposed at the inner bottom of the intermediate housing. The rotor metal rod is snapped and fixed to a torque output shaft on the side away from the agitating fan blades, and the torque output shaft extends to the outside of the top cover.

[0012] As a preferred embodiment of the present invention, the brushed system includes: a brushed electrode ring electrically connected to the armature winding and mounted on the outside of the rotor metal rod; an insertion port formed at the inner edge of the brushed electrode ring; a brushed electrode plate matching the insertion port and mounted on the outside of the brushed electrode ring; a carbon brush abutting against the outside of the brushed electrode plate; and metal cylinders movably sleeved on the outside of the carbon brush and mounted on the left and right sides of the inner wall of the intermediate housing. The brushed electrode plates are provided in multiple ways, with gaps between adjacent brushed electrode plates.

[0013] As a preferred embodiment of the present invention, the pressurized water-cooling assembly includes: a horizontal reciprocating screw installed at the bottom of the rotor metal rod and rotatably connected to the center of the sealed bottom cover; a horizontal slider connected to the outside of the horizontal reciprocating screw via ball bearings; connecting sleeves installed on both sides of the bottom of the horizontal slider; a pressurizing plunger installed on the inner side of the bottom of the connecting sleeves; a water-cooling channel disposed outside the pressurizing plunger and communicating with the annular water-cooling cylinder; a flow port opened at the top of the bottom water-cooling channel; and a sealing rubber ring sleeved on the outer side of the top of the pressurizing plunger. The water-cooling channel is provided in multiple ways, and all of the multiple water-cooling channels are located on the side of the main magnetic pole and the commutation pole. The water-cooling channel is provided through the outer sealing ring, and the flow port is located on the side of the sealing plate. The flow port is provided in multiple ways.

[0014] In a preferred embodiment of the present invention, the annular cooling pipe is configured to penetrate a pre-drilled hole inside the carbon brush, wherein the cross-sectional area of ​​the pre-drilled hole is larger than the cross-sectional area of ​​the annular cooling pipe. The annular cooling pipe is equipped with insulating baffles on its outer sides, located on both the upper and lower sides of the carbon brush. The cross-sectional area of ​​the insulating baffles is larger than the cross-sectional area of ​​the pre-drilled holes.

[0015] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. In a water-cooled motor for an electric vehicle, when the motor stator (the main magnetic poles and excitation windings that generate the magnetic field) and rotor (the rotating armature core and rotor metal rods) generate an alternating magnetic field to achieve rotation, the force generated by the rotation of the rotor metal rod drives the pressurized plunger to reciprocate within the water-cooling channel. This continuously delivers coolant to the annular water-cooling cylinder through a squeezing injection method. The design of the water-cooling channel indirectly cools the motor stator (main magnetic poles and excitation windings) during operation, reducing the probability of high-temperature gas accumulating on the outside of the stator during current transmission. Simultaneously, the coolant delivered to the annular water-cooling cylinder can also circulate through guide pipes to the annular cooling pipe, indirectly cooling the brushed motor system located outside the annular cooling pipe. This reduces the probability of accidents caused by electric sparks and arcs generated by friction during operation of the brushed motor system, improving the safety of the motor when installed in an electric vehicle. 2. In the water-cooled motor of an electric vehicle, by creating pre-drilled holes with a diameter and width larger than the length of the annular cooling pipe inside the carbon brushes of the motor's brushed system, sufficient space is provided for the relative movement of the carbon brushes when they move relative to the brush electrode plates due to friction. This prevents deformation of the annular water-cooling cylinder caused by friction and collision, which could affect the normal flow and circulation of the coolant inside the annular water-cooling cylinder, ensuring the coolant flows normally within the motor to achieve water-cooling heat dissipation. Simultaneously, the design of an insulating baffle at the top of the pre-drilled hole and installed on the outside of the annular cooling pipe further provides stable support for the connection between the annular cooling pipe and the carbon brush, further ensuring that the movement of the carbon brushes does not affect the normal flow of coolant inside the annular cooling pipe. 3. In water-cooled motors for electric vehicles, by placing the motor rotor, stator, and cooling system inside a single motor housing, the footprint of the motor and its cooling system when assembled into the electric vehicle is reduced. Furthermore, the shorter distance between the motor rotor, stator, and cooling system allows for faster cooling and heat dissipation of the high-temperature gas inside the motor (generated by the operation of the motor rotor and stator), thus improving the heat dissipation capacity and effectiveness of the water-cooled motor. This effectively reduces the energy consumption of the water-cooled motor and extends its service life. 4. In the water-cooled motor of electric vehicles, by setting an intermediate sealing ring (located outside the rotor metal rod) and an outer sealing ring (located outside the water-cooling channel for coolant flow) at the connection between the left and right sides of the motor, the storage space of the internal cooling system of the motor and the space where the motor stator and rotor operate can be relatively sealed. This reduces the probability that the coolant in the cooling space will leak into the space where the motor stator and rotor operate due to air pressure (due to the high temperature generated by the motor operation), thus improving the safety of the integrated water-cooled motor in actual assembly and use. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" 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 application based on the specific circumstances.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the entire structure of the present invention; Figure 3 This is the present invention. Figure 2 Enlarged structural diagram of region A in the middle; Figure 4 This is a schematic diagram of the connection between the stator and rotor assembly and the brushed water-cooling structure of the present invention; Figure 5 This is a schematic diagram of the main view showing the connection between the stator and rotor assembly and the brushed system of the present invention; Figure 6 This is a schematic diagram of the connection between the stator and rotor assembly and the brushed system of the present invention; Figure 7 This is an exploded view of the connection between the intermediate sealing ring and the stirring fan blades of the present invention; Figure 8 This is a schematic diagram of the connection between the rotor metal rod and the pressurized water cooling assembly of the present invention; Figure 9 This is the present invention. Figure 8 Enlarged structural diagram of region B in the middle; Figure 10 This is a schematic diagram of the structure connecting the water-cooling channel and the annular cooling pipe of the present invention; Figure 11 This is a schematic diagram of the connection between the brushed system and the annular cooling pipe of the present invention; Figure 12 This is an exploded view of the brushed system and the annular cooling pipe connection of the present invention; Figure 13 This is an exploded view of the sealing bottom cover and the embedded piston connection of the present invention; In the picture: 10. Motor housing; 101. Intermediate housing; 1011. Intermediate sealing ring; 1012. Sealing plate; 1013. Outer sealing ring; 102. Top cover; 103. Sealing bottom cover; 20. Electrical box system; 30. Stator and rotor assembly; 301. Main magnetic pole; 302. Excitation winding; 303. Commutating pole; 304. Armature core; 305. Winding slot; 306. Armature winding; 40. Brushed water-cooled structure; 401. Rotor metal rod; 402. Brushed system; 403. Pressurized water-cooling assembly; 404. Annular water-cooling cylinder; 405. Guide tube; 406. Annular cooling tube; 4011. Agitating fan blades; 4012. Torque output shaft; 4021. Brushed electrode ring; 4022. Insertion port; 4023. Brushed electrode plate; 4024. Carbon brush; 4025. Metal cylinder; 4031. Horizontal reciprocating lead screw; 4032. Horizontal slider; 4033. Connecting sleeve; 4034. Pressure plunger; 4035. Water cooling channel; 4036. Flow port; 4037. Sealing rubber ring; 50. Reserved hole; 501. Insulating baffle; 60. Sealing insert plug; 601. Insert piston; 602. Sealing rubber ring. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] Example 1 Please see Figures 1-12An electric vehicle water-cooled motor includes a motor housing 10; an electrical box system 20 mounted on the top side of the motor housing 10 by screws; a stator-rotor assembly 30 disposed at the center inside the motor housing 10; and a brushed water-cooling structure 40 connected to the stator-rotor assembly 30 and extending to the outside of the motor housing 10. The brushed water-cooling structure 40 includes: a rotor metal rod 401 connected to the stator-rotor assembly 30 and extending to the outside of the motor housing 10; and a brush mounted on the outside of the rotor metal rod 401 and connected to the stator-rotor assembly 30. System 402; pressurized water cooling assembly 403 connected to the bottom of rotor metal rod 401; annular water cooling cylinder 404 sleeved on the outside of rotor metal rod 401 and connected to pressurized water cooling assembly 403; guide pipes 405 connected to the upper and lower sides of annular water cooling cylinder 404; annular cooling pipe 406 connected to guide pipe 405 and penetrating brush system 402, wherein the annular water cooling cylinder 404 is disposed on the side of brush system 402, and electrical box system 20 is electrically connected to stator and rotor assembly 30 and brush system 402 respectively.

[0021] In this design, an agitator blade 4011 is installed on the outer side of the bottom of the rotor metal rod 401, located outside the sealing plate 1012. The agitator blade 4011 is movably disposed at the inner bottom of the intermediate housing 101. A torque output shaft 4012 is snapped and fixed on the side of the rotor metal rod 401 away from the agitator blade 4011. The torque output shaft 4012 extends to the outer side of the top cover 102.

[0022] The working principle described above is as follows: When the electrical box system 20 transmits the rated current to the stator-rotor assembly 30, causing the stator-rotor assembly 30 to operate and generate an alternating magnetic field that drives the rotor metal rod 401 installed inside to rotate, the continuously transmitted current and the generated magnetic field inside the stator-rotor assembly 30 will generate a large amount of heat that accumulates inside the motor housing 10. At this time, the rotation of the motor housing 10 will drive the pressurized water cooling assembly 403 installed on its outside to operate, transferring the coolant located inside the motor housing 10 to the outside of the stator-rotor assembly 30 through pressurized injection, and indirectly dissipating the high-temperature gas accumulated inside and outside the stator-rotor assembly 30, thereby reducing the accumulation of heat inside the motor. Meanwhile, the coolant in the transmission state can also be transmitted to the interior of the annular cooling pipe 406 through the guide pipe 405 (which is equipped with a flow rate control valve) connected to the top of the annular water cooling cylinder 404. The annular cooling pipe 406 indirectly cools the brushed system 402 in operation, reducing the probability of accidents caused by electric sparks and arcs generated by friction when the brushed system 402 is in operation, thus ensuring high safety.

[0023] For details, please refer to the following: Figure 2 and Figure 7The motor housing 10 includes: an intermediate housing 101; a top cover 102 connected to the top of the intermediate housing 101 by screws; and a sealing bottom cover 103 installed on the outer side of the bottom of the intermediate housing 101 by screws, wherein the stator and rotor assembly 30 is disposed inside the intermediate housing 101.

[0024] In this design, an intermediate sealing ring 1011 is provided on one side of the intermediate outer shell 101 inside the sealing bottom cover 103, which is installed on the outside of the rotor metal rod 401. A sealing plate 1012 is provided on the outside of the intermediate sealing ring 1011, located on the inner wall of the intermediate outer shell 101. There are two sealing plates 1012. Between the two sealing plates 1012, an outer sealing ring 1013 is provided on the outside of the pressurized water cooling assembly 403. There are multiple outer sealing rings 1013. The rotor metal rod 401 is penetrated through the interior of the intermediate sealing ring 1011.

[0025] In the water-cooled motor for electric vehicles of the present invention, the space on one side of the sealed bottom cover 103 is designated as a storage space for coolant, and the space on the other side of the sealed bottom cover 103 is designated as the space for the motor stator and rotor to operate. At the same time, the design of the intermediate sealing ring 1011 and the outer sealing ring 1013 ensures the sealing effect of the connection between the two, preventing coolant from leaking and entering the space of the stator and rotor assembly 30.

[0026] For details, please refer to the following: Figure 5 and Figure 6 The stator and rotor assembly 30 includes: main magnetic poles 301 arranged in a ring inside the intermediate housing 101; excitation windings 302 sleeved on the outside of the main magnetic poles 301; commutating poles 303 installed inside the intermediate housing 101 and located between two adjacent main magnetic poles 301; armature cores 304 arranged inside the multiple main magnetic poles 301 and commutating poles 303; winding slots 305 opened at the eccentric position inside the armature cores 304; and armature windings 306 arranged inside the winding slots 305 and extending to the outside of the armature cores 304. A rotor metal rod 401 is installed through the center of the armature cores 304, and the armature windings 306 are electrically connected to the brush system 402.

[0027] In this scheme, the main magnetic pole 301 is composed of multiple thin steel plates, each with a thickness of 1mm. The commutating pole 303 is composed of an external commutating winding and an internal commutating core, the commutating core being composed of multiple thin steel plates. Both the main magnetic pole 301 and the commutating pole 303 are electrically connected to the electrical box system 20.

[0028] In the water-cooled motor for electric vehicles of the present invention, when it is necessary to drive the armature core 304 and the rotor metal rod 401 to rotate, current is transmitted to the main magnetic poles 301. The magnetic field formed by the main magnetic poles 301 drives the armature core 304 inside it to rotate, thereby driving the rotor metal rod 401 installed inside the armature core 304 to rotate. The design of the commutating poles 303 allows for adjustment and control of the direction of the magnetic field, making the magnetic field formed by the main magnetic poles 301 an alternating magnetic field, thereby achieving continuous and controllable unidirectional rotation of the rotor metal rod 401.

[0029] For details, please refer to the following: Figure 11 and Figure 12 The brushed system 402 includes: a brushed electrode ring 4021 electrically connected to the armature winding 306 and installed on the outside of the rotor metal rod 401; an insertion port 4022 opened at the inner edge of the brushed electrode ring 4021; a brushed electrode plate 4023 matching the insertion port 4022 and installed on the outside of the brushed electrode ring 4021; a carbon brush 4024 abutting against the outside of the brushed electrode plate 4023; and a metal cylinder 4025 movably sleeved on the outside of the carbon brush 4024 and installed on the left and right sides of the inner wall of the intermediate housing 101. The brushed electrode plate 4023 is provided in multiple ways, and there is a gap between two adjacent brushed electrode plates 4023.

[0030] In the water-cooled motor for electric vehicles of the present invention, when the rotor metal rod 401 drives the torque output shaft 4012 to rotate, it synchronously drives the brushed electrode ring 4021 to rotate, causing the brushed electrode plate 4023 mounted on the outer side of the brushed electrode ring 4021 to rotate. At this time, through the friction between the brushed electrode plate 4023 and the carbon brush 4024, the rotation direction can be adjusted in conjunction with the commutation pole 303, which facilitates the high-stability rotational operation of the rotor metal rod 401.

[0031] For details, please refer to the following: Figure 8 and Figure 9The pressurized water-cooling assembly 403 includes: a horizontal reciprocating screw 4031 installed at the bottom of the rotor metal rod 401 and rotatably connected to the center of the sealed bottom cover 103; a horizontal slider 4032 connected to the outside of the horizontal reciprocating screw 4031 by ball bearings; connecting sleeves 4033 installed on both sides of the bottom of the horizontal slider 4032; a pressurizing plunger 4034 installed on the inner side of the bottom of the connecting sleeves 4033; and a ring-shaped water-cooling cylinder 404 disposed outside the pressurizing plunger 4034 and communicating with it. The water cooling channel 4035; the flow port 4036 opened at the top of the bottom water cooling channel 4035; the sealing rubber ring 4037 sleeved on the outer side of the top of the pressure plunger 4034, wherein multiple water cooling channels 4035 are provided, and multiple water cooling channels 4035 are located on the side of the main magnetic pole 301 and the commutating pole 303. The water cooling channel 4035 is provided through the outer sealing ring 1013. The flow port 4036 is located on the side of the sealing plate 1012, and multiple flow ports 4036 are provided.

[0032] In the water-cooled motor for electric vehicles of the present invention, when the rotor metal rod 401 rotates, it drives the horizontal reciprocating lead screw 4031 installed at its bottom to rotate, causing the horizontal slider 4032 connected to the outside of the horizontal reciprocating lead screw 4031 via ball bearings to move horizontally (reciprocate). At this time, the horizontal reciprocating movement of the horizontal slider 4032 drives the connecting sleeve rods 4033 connected to its bottom left and right sides to move, causing the pressure plunger 4034 installed on the bottom inner side of the connecting sleeve rod 4033 to move in the inner bottom of the water-cooling channel 4035, squeezing and injecting the coolant delivered to the water-cooling channel 4035, thereby achieving efficient coolant flow and cooling operation. The design of the sealing rubber ring 4037 can reduce the problem of coolant leakage when the pressure plunger 4034 moves horizontally, ensuring the effectiveness and capacity of the pressurized coolant injection.

[0033] It should be noted that the water cooling channel 4035 is equipped with a one-way valve structure on the inner side of the pressurized plunger 4034. The one-way valve structure controls the one-way flow of cooling water and prevents the cooling water from flowing back.

[0034] Example 2 For details, please refer to the following: Figure 11 and Figure 12 The annular cooling pipe 406 is provided through the reserved hole 50 inside the carbon brush 4024. The cross-sectional area of ​​the reserved hole 50 is larger than the cross-sectional area of ​​the annular cooling pipe 406. The annular cooling pipe 406 is provided with an insulating baffle 501 on the outside of the upper and lower sides of the carbon brush 4024. The cross-sectional area of ​​the insulating baffle 501 is larger than the cross-sectional area of ​​the reserved hole 50.

[0035] In the water-cooled motor for electric vehicles of the present invention, the design of the reserved hole 50 provides sufficient space for the movement of the carbon brush 4024, ensuring that the carbon brush 4024 does not compress the coolant inside the annular cooling pipe 406 during operation, thus ensuring normal and stable flow of the coolant. Simultaneously, the design of the insulating baffle 501 provides stable support for the annular cooling pipe 406, effectively preventing movement of the annular cooling pipe 406 while ensuring the proper installation positions of the annular cooling pipe 406 and the carbon brush 4024.

[0036] Example 3 For details, please refer to the following: Figure 13 At the center of the bottom of the sealing cover 103, a sealing insert 60 is threaded and rotatably connected to the horizontal reciprocating screw 4031. The sealing insert 60 is hollow inside, and an insert piston 601 is provided inside the hollow sealing insert 60. A sealing rubber ring 602 is sleeved on the outside of the insert piston 601.

[0037] In the water-cooled motor of the electric vehicle of the present invention, when it is necessary to replace the coolant inside the water-cooled motor, the coolant inside the water-cooled motor can be drained by removing the sealing rubber ring 602 and inserting a conduit. At the same time, the design of the sealing rubber ring 602 on the outside of the embedded piston 601 improves the sealing ability of the coolant inside the motor and reduces the probability that the embedded piston 601 will be ejected due to changes in the internal temperature and air pressure of the motor.

[0038] Therefore, any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this invention, based on the technical solution and inventive concept of this invention, should be covered within the protection scope of this invention.

Claims

1. A water-cooled motor for electric vehicles, characterized in that, include: Motor housing (10); electrical box system (20) mounted on the top side of the motor housing (10) by screws; stator and rotor assembly (30) disposed at the center inside the motor housing (10); brushed water cooling structure (40) connected to the stator and rotor assembly (30) and extending to the outside of the motor housing (10). The brushed water-cooled structure (40) includes: a rotor metal rod (401) connected to the stator-rotor assembly (30) and extending to the outside of the motor housing (10); a brush system (402) installed on the outside of the rotor metal rod (401) and connected to the stator-rotor assembly (30); a pressurized water-cooling assembly (403) connected to the bottom of the rotor metal rod (401); an annular water-cooling cylinder (404) sleeved on the outside of the rotor metal rod (401) and connected to the pressurized water-cooling assembly (403); guide pipes (405) connected to the upper and lower sides of the annular water-cooling cylinder (404); and an annular cooling pipe (406) connected to the guide pipe (405) and penetrating the brush system (402). The annular water-cooled cylinder (404) is disposed on the side of the brushed system (402), and the electrical box system (20) is electrically connected to the stator and rotor assembly (30) and the brushed system (402) respectively.

2. The water-cooled motor for an electric vehicle according to claim 1, characterized in that: The motor housing (10) includes: an intermediate housing (101); a top cover (102) connected to the top of the intermediate housing (101) by screws; and a sealing bottom cover (103) installed on the outer side of the bottom of the intermediate housing (101) by screws. The intermediate outer shell (101) contains a stator and rotor assembly (30).

3. The water-cooled motor for an electric vehicle according to claim 2, characterized in that: The intermediate outer shell (101) is provided with an intermediate sealing ring (1011) installed on the outside of the rotor metal rod (401) on one side inside the sealing bottom cover (103). A sealing plate (1012) is provided on the outside of the intermediate sealing ring (1011) and located on the inner wall of the intermediate outer shell (101). There are two sealing plates (1012). Among them, an outer sealing ring (1013) located outside the pressurized water cooling assembly (403) is provided between the two sealing plates (1012). Multiple outer sealing rings (1013) are provided, and a rotor metal rod (401) is provided through the interior of the middle sealing ring (1011).

4. The water-cooled motor for an electric vehicle according to claim 3, characterized in that: The stator and rotor assembly (30) includes: main magnetic poles (301) arranged in a ring inside the intermediate housing (101); excitation windings (302) sleeved on the outside of the main magnetic poles (301); commutation poles (303) installed inside the intermediate housing (101) and located between two adjacent main magnetic poles (301); armature cores (304) arranged inside the plurality of main magnetic poles (301) and commutation poles (303); winding slots (305) opened at an eccentric position inside the armature cores (304); and armature windings (306) arranged inside the winding slots (305) and extending to the outside of the armature cores (304). The armature core (304) has a rotor metal rod (401) installed through the center of its interior, and the armature winding (306) is electrically connected to the brush system (402).

5. A water-cooled motor for an electric vehicle according to claim 4, characterized in that: The main magnetic pole (301) is composed of multiple thin steel plates, each with a thickness of 1 mm. The commutating pole (303) is composed of an outer commutating winding and an inner commutating core, the commutating core being composed of multiple thin steel plates. The main magnetic pole (301) and the commutation pole (303) are both electrically connected to the electrical box system (20).

6. The water-cooled motor for an electric vehicle according to claim 2, characterized in that: An agitator blade (4011) is mounted on the outer side of the bottom of the rotor metal rod (401) and is located outside the sealing plate (1012). The agitator blade (4011) is movably disposed at the inner bottom of the intermediate outer shell (101). The rotor metal rod (401) is fixedly connected to a torque output shaft (4012) on the side away from the agitating fan blade (4011), and the torque output shaft (4012) extends to the outside of the top cover (102).

7. A water-cooled motor for an electric vehicle according to claim 4, characterized in that: The brushed system (402) includes: a brushed electrode ring (4021) electrically connected to the armature winding (306) and installed on the outside of the rotor metal rod (401); an insertion port (4022) opened at the inner edge of the brushed electrode ring (4021); a brushed electrode plate (4023) matching the insertion port (4022) and installed on the outside of the brushed electrode ring (4021); a carbon brush (4024) abutting against the outside of the brushed electrode plate (4023); and a metal cylinder (4025) movably sleeved on the outside of the carbon brush (4024) and installed on the left and right sides of the inner wall of the intermediate housing (101). The brushed electrode plate (4023) is provided in multiple ways, and there is a gap between two adjacent brushed electrode plates (4023).

8. A water-cooled motor for an electric vehicle according to claim 4, characterized in that: The pressurized water-cooling assembly (403) includes: a horizontal reciprocating screw (4031) installed at the bottom of the rotor metal rod (401) and rotatably connected to the center of the sealed bottom cover (103); a horizontal slider (4032) connected to the outside of the horizontal reciprocating screw (4031) by ball bearings; connecting sleeves (4033) installed on both sides of the bottom of the horizontal slider (4032); a pressurizing plunger (4034) installed on the inner side of the bottom of the connecting sleeve (4033); a water-cooling channel (4035) disposed outside the pressurizing plunger (4034) and connected to the annular water-cooling cylinder (404); a flow port (4036) opened at the top of the bottom water-cooling channel (4035); and a sealing rubber ring (4037) sleeved on the outer side of the top of the pressurizing plunger (4034). The water-cooling channel (4035) is provided in multiple ways. The multiple water-cooling channels (4035) are located on the side of the main magnetic pole (301) and the commutation pole (303). The water-cooling channel (4035) is provided through the outer sealing ring (1013). The flow port (4036) is located on the side of the sealing plate (1012). The flow port (4036) is provided in multiple ways.

9. A water-cooled motor for an electric vehicle according to claim 7, characterized in that: The annular cooling pipe (406) is configured to penetrate a pre-drilled hole (50) inside the carbon brush (4024), and the cross-sectional area of ​​the pre-drilled hole (50) is larger than the cross-sectional area of ​​the annular cooling pipe (406). Among them, the annular cooling pipe (406) is equipped with an insulating baffle (501) on the outside of the upper and lower sides of the carbon brush (4024), and the cross-sectional area of ​​the insulating baffle (501) is larger than the cross-sectional area of ​​the reserved hole (50).

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