Motor and power system for vehicle

Abstract

The invention provides a motor and a power system for a vehicle. In the motor of the present application, a first flow path is formed between a stator and a housing, and a second flow path is formed through a rotor stack. The guide assembly sleeves the rotor shaft and can rotate along with the rotor shaft. A plurality of cavities spaced in the circumferential direction are formed in the guiding assembly, cooling fluid from the first flow path enters the cavities through the opening, the first cavity in the cavities communicates with the second flow path, the second cavity in the cavities communicates with a spraying hole formed in the guiding assembly, and the spraying hole is communicated with the spraying hole. And the cooling fluid entering the first cavity flows through the rotor laminated body through the second flow path, and the cooling fluid entering the second cavity can be sprayed to the stator through the spraying holes under the action of centrifugal force. In this way, a passive cooling configuration for cooling the rotor is achieved with a relatively simple structure, thereby reducing the cost of the pumping device. The probability that cooling fluid leaks at the sealing structure is reduced, and the cooling effect is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle power systems, and in particular to an electric motor and a vehicle power system comprising the electric motor. Background Art

[0002] Nowadays, electric motors are often used as the power source for output torque in pure electric vehicles or hybrid vehicles, and the electric motors and speed change mechanisms are further used to form the so-called electric bridge drive system. With the development of electric bridge drive systems, they are required to have higher performance, which requires effective cooling of the motors. Therefore, the main development direction of electric bridge drive systems is oil-cooled electric bridge drive systems.

[0003] In a typical oil-cooled electric bridge drive system, due to structural and spatial limitations, it is difficult for the cooling fluid (such as oil) to reach the rotor. In order to enable the cooling fluid to reach the rotor smoothly, it is necessary to establish a long and complex flow path, and then use a high-power pumping device (such as an oil pump) to supply the cooling oil to the rotor through the flow path. In this way, the cooling structure used to cool the rotor is an active cooling structure, and the flow path is long and complex in structure, which not only leads to a large flow resistance and increases the cost of the pumping device, but also increases the processing difficulty and processing cost of other components such as the housing for forming the flow path. In addition, on the extension path of the flow path, it is necessary to set many sealing structures between the housing and the rotor shaft, between the housing and the half shaft, and between the half shaft and the rotor shaft. In this way, not only does it lead to a complex sealing structure and increased costs, but it also leads to a reduction in the reliability of the entire system, and the cooling oil may leak at the sealing structure, thereby affecting the cooling effect. Summary of the invention

[0004] This application is made in view of the state of the prior art. One object of the application is to provide a motor that can simplify the flow path of the cooling structure for cooling the rotor, reduce the corresponding cost, and reduce the required sealing structure, thereby simplifying the sealing structure and improving the reliability and cooling effect of the system. Another object of the application is to provide a vehicle power system including the above-mentioned motor.

[0005] In order to achieve the above objectives, the present application may adopt the following technical solutions.

[0006] The present application provides a motor as follows, comprising:

[0007] case;

[0008] a stator, which is located in the housing and fixed to the housing, and a first flow path is formed between the stator and the housing;

[0009] a rotor located in the housing and radially inward of the stator, the rotor including a rotor laminate and a rotor shaft fixed to each other, the rotor laminate forming a second flow path penetrating along the axial direction of the motor; and

[0010] a guide assembly, which is sleeved on the rotor shaft, the guide assembly is formed with a plurality of chambers, the plurality of chambers are distributed at intervals in the circumferential direction of the motor, each of the chambers is formed with an opening which is open to the radial outside and is opposite to the outlet of the first flow path in the radial direction of the motor, so that the cooling fluid from the first flow path can be sprayed into the plurality of chambers,

[0011] The multiple chambers include a first chamber and a second chamber, the first chamber is connected to the second flow path, and the guide assembly is also formed with a spray hole connected to the second chamber. The cooling fluid entering the first chamber flows through the rotor stack via the second flow path, and the cooling fluid entering the second chamber is sprayed onto the stator via the spray hole under the action of centrifugal force.

[0012] In an optional solution, the first chamber and the second chamber are arranged alternately in the circumferential direction.

[0013] In another optional solution, the guide assembly has a guide portion, and the guide portion extends obliquely toward the radial inside during the process of extending toward the rotor stack.

[0014] The guide portion is opposed to an outlet of the first flow path in the radial direction, so that the cooling fluid from the first flow path can flow to the guide portion via the opening.

[0015] In another optional solution, the guide assembly includes a first guide ring and a second guide ring assembled together, the first guide ring having a first circumferential wall extending continuously along the circumference over the entire circumference, the second guide ring having a second circumferential wall extending continuously along the circumference over the entire circumference, the second circumferential wall and the first circumferential wall being spaced apart from each other in the radial direction and facing each other, and the injection hole being formed in the second circumferential wall.

[0016] The first guide ring also has a plurality of partition walls extending from the first circumferential wall toward the second circumferential wall and distributed at intervals in the circumferential direction, so that the space between the first circumferential wall and the second circumferential wall is divided by the plurality of partition walls to form the plurality of chambers.

[0017] In another optional solution, the second circumferential wall is located radially outside the first circumferential wall, and both the first circumferential wall and the second circumferential wall extend obliquely toward the radial inside in the process of extending toward the rotor stack.

[0018] In another optional solution, the first guide ring has a first end wall bent from one end of the first peripheral wall toward the radial inside, and the second guide ring has a second end wall bent from one end of the second peripheral wall toward the radial inside.

[0019] The first end wall and the second end wall are spaced apart from each other in the axial direction and are opposite to each other, a guide flow path communicating with the first chamber is defined between the first end wall and the second end wall, the second end wall abuts against the rotor stack and is formed with a guide hole, so that the cooling fluid from the first chamber can be guided into the second flow path via the guide flow path and the guide hole,

[0020] The radial inner side of the second chamber is closed.

[0021] In another optional solution, the rotor includes a first balancing disk, the first balancing disk is fixedly mounted on the rotor shaft, and the outer periphery of the first balancing disk has an axial limit portion and an external spline arranged side by side in the axial direction.

[0022] The first end wall is formed with a first internal spline, and the second end wall is formed with a second internal spline. The first internal spline and the second internal spline are spline-matched with the external spline, and both the first end wall and the second end wall are clamped by the rotor stack and the axial limiting portion in the axial direction.

[0023] In another optional scheme, the rotor stack includes a plurality of rotor units stacked in the axial direction, each rotor unit is formed with a weight-reducing hole extending along the axial direction, and the weight-reducing holes of the rotor units adjacent to each other in the axial direction are connected to form the second flow path.

[0024] In another optional solution, the rotor further includes a second balancing disk, which is fixedly mounted on the rotor shaft, and the second balancing disk is formed with a through hole connected to the second flow path, so that the cooling fluid from the second flow path can flow out of the rotor through the through hole.

[0025] The present application also provides a vehicle power system as follows, comprising the motor described in any one of the above technical solutions.

[0026] By adopting the above technical solution, the present application provides a new type of motor and a vehicle power system including the motor. The motor of the present application includes a housing, a stator, a rotor and a guide assembly assembled together. The stator is located in the housing and fixed to the housing, and a first flow path is formed between the stator and the housing. The rotor is located in the housing and located radially inside the stator. The rotor includes a rotor stack and a rotor shaft fixed to each other, and the rotor stack is formed with a second flow path that passes through the axial direction of the motor. The guide assembly is sleeved on the rotor shaft and can rotate with the rotor shaft. The guide assembly is formed with a plurality of chambers spaced apart in the circumferential direction, and each chamber is formed with an opening that is open to the radial outside and opposite to the outlet of the first flow path. Thus, the cooling fluid from the first flow path enters the plurality of chambers through the opening, the first chamber of the plurality of chambers is connected to the second flow path, and the second chamber of the plurality of chambers is connected to the injection hole formed by the guide assembly, so that the cooling fluid entering the first chamber flows through the rotor stack via the second flow path, and the cooling fluid entering the second chamber can be sprayed to the stator via the injection hole under the action of centrifugal force.

[0027] In this way, after flowing through the first flow path to cool the stator, part of the cooling fluid is ejected through the outlet of the first flow path, thereby entering the multiple chambers through the openings of the multiple chambers. Therefore, there is no need to separately set up a pumping device or to use a high-power pumping device to pump the cooling fluid separately into the above-mentioned multiple chambers. Therefore, the cooling structure for the rotor realizes a passive cooling structure, thereby reducing the cost of the pumping device.

[0028] In addition, the cooling structure for cooling the rotor is realized with a relatively simple structure, so that the length of the flow path of the cooling structure is relatively short, which further avoids the increase of the power of the pumping device and reduces the cost of the pumping device. Moreover, it is not necessary to set too many sealing structures corresponding to the cooling structure, thereby simplifying the corresponding sealing structure and improving the reliability of the entire system, reducing the probability of leakage of the cooling fluid at the sealing structure, and improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1A 1 is a schematic cross-sectional view showing a power system for a vehicle according to an embodiment of the present application, in which the section lines are omitted.

[0030] Figure 1B It shows Figure 1A An enlarged stereogram of the local structure.

[0031] Figure 1C It shows Figure 1A Another schematic cross-sectional view of a power system for a vehicle in which section lines are omitted.

[0032] Figure 1D It shows Figure 1CAn enlarged stereogram of the local structure.

[0033] Figure 1E It shows Figure 1A Schematic diagram of the communication state of the chamber and flow path defined by the guide assembly and rotor of the motor of the vehicle power system.

[0034] Figure 1F It shows Figure 1A A three-dimensional schematic diagram of a combination of a rotor and a guide assembly of an electric motor of a vehicle power system.

[0035] Figure 1G It shows Figure 1F Schematic diagram of the decomposition of the assembly.

[0036] Figure 2A It shows Figure 1F A three-dimensional schematic diagram of the first balancing disk of the rotor of the motor.

[0037] Figure 2B It shows Figure 2A Another three-dimensional schematic diagram of the first balancing disk in FIG.

[0038] Figure 3A It shows Figure 1F A three-dimensional schematic diagram of the second balancing disk of the rotor of the motor.

[0039] Figure 3B It shows Figure 3A Another three-dimensional schematic diagram of the second balancing disk in.

[0040] Figure 4A It shows Figure 1F A three-dimensional schematic diagram of the first guide ring of the guide assembly of the motor.

[0041] Figure 4B It shows Figure 4A Another stereoscopic schematic diagram of the first guide ring in.

[0042] Figure 5A It shows Figure 1F A three-dimensional schematic diagram of the second guide ring of the guide assembly of the motor.

[0043] Figure 5B It shows Figure 5A Another stereoscopic schematic diagram of the second guide ring in.

[0044] Description of Reference Numerals

[0045] 1 housing;

[0046] 2 stator; 21 iron core; 22 winding; 221 extended portion;

[0047] 3 rotor; 31 rotor laminate; 31u rotor unit; 31h weight reduction hole; 32 rotor shaft; 33 first balancing disc; 331 axial limiting portion; 332 external spline; 34 second balancing disc; 34h through hole;

[0048] 4 guide assembly; 41 first guide ring; 411 first peripheral wall; 412 first end wall; 412t first internal spline; 413 partition wall; 414 guide portion; 42 second guide ring; 421 second peripheral wall; 421h injection hole; 422 second end wall; 422t second internal spline; 422h drainage hole;

[0049] P1 first flow path; P2 second flow path; P3 guide flow path; C1 first chamber; C2 second chamber; h1 outlet; h2 opening;

[0050] A is axial; R is radial. DETAILED DESCRIPTION

[0051] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0052] In this application, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the motor, respectively. "Axial side" refers to Figure 1A and Figure 1C The left side of the axis refers to Figure 1A and Figure 1C The right side in the figure; “radially outer side” refers to the side radially away from the central axis of the motor, and “radially inner side” refers to the side radially close to the central axis of the motor.

[0053] The specific structure of the vehicle power system according to an embodiment of the present application will be described below in conjunction with the drawings in the specification, especially the cooling structure for cooling the rotor in the motor of the vehicle power system.

[0054] like Figures 1A to 1DAs shown, the vehicle power system according to one embodiment of the present application is an electric bridge drive system, which includes a motor and a transmission according to the present application. The motor according to the present application includes a housing 1, a stator 2, a rotor 3 and a guide assembly 4 assembled together. The stator 2, the rotor 3 and the guide assembly 4 are mounted on the housing 1 and are basically located inside the housing 1, and they are assembled together in a coaxial manner. The rotor 3 is located radially inside the stator 2 and can rotate relative to the stator 2. There is an air gap between the rotor 3 and the stator 2 and is connected to the transmission mechanism of the transmission via the rotor shaft 32. The motor is provided with a cooling structure for cooling the stator 2 and cooling the rotor 3. The cooling fluid (such as oil) from the transmission can be pumped into the cooling structure by a pumping device to cool the stator 2 and the rotor 3. Therefore, the motor according to the present application is a so-called oil-cooled motor, and the electric bridge drive system according to the present application is an oil-cooled electric bridge drive system.

[0055] In this embodiment, if Figures 1A to 1D As shown, the housing 1 may include a main body and a cover assembled together. The main body has a cylindrical shape, and the main body can be fixedly assembled with the housing of the transmission. The cover closes the opening of the main body from one axial side, and the cover can be detachably fixed to the main body by a mechanical connection method such as bolt connection. In this way, a accommodating space is formed by the main body and the cover, and other components are basically accommodated in the accommodating space. In addition, an input flow path can also be formed on the top of the main body, and the input flow path is connected to the pumping mechanism of the vehicle power system, so that the cooling fluid in the transmission can be pumped into the housing 1 of the motor via the input flow path by the pumping mechanism.

[0056] In this embodiment, if Figures 1A to 1DAs shown, the stator 2 includes an iron core 21 and a winding 22 assembled together. The iron core 21 is located in the housing 1 and is fixed to the main body of the housing 1. The iron core 21 can be composed of a plurality of silicon steel sheets stacked and fixed together in the axial direction A. The iron core 21 has a cylindrical structure as a whole and the iron core 21 can be fixed to the main body of the housing 1 by interference fit. A groove extending along the axial direction A is formed on the outer circumferential surface of the iron core 21 or on the inner circumferential surface of the main body of the housing 1, so that a first flow path P1 is defined between the iron core 21 and the housing 1, and the cooling fluid from the input flow path can flow from one axial side to the other axial side via the first flow path P1 to cool the iron core 21, and then the cooling fluid is ejected from a plurality of outlets h1. In addition, the iron core 21 includes a plurality of teeth, and the plurality of teeth are evenly distributed at intervals in the circumferential direction. A slot for mounting the wire conductor of the winding 22 is formed between every two adjacent teeth, and each slot extends through the iron core 21 along the axial direction A. Furthermore, the central portion of the winding 22 is inserted into the slot installed in the iron core 21, and the ends of the winding 22 located on both sides of the central portion in the axial direction form a protruding portion 221 protruding from the iron core 21. The protruding portion 221 located on the other axial side is opposite to the partial outlet h1 of the first flow path P1 in the radial direction R, so that a part of the cooling fluid will be sprayed to the protruding portion 221 of the winding 22, thereby cooling the winding 22.

[0057] In this embodiment, if Figures 1A to 1D As shown, the rotor 3 includes a rotor stack 31, a rotor shaft 32, a first balancing disc 33 and a second balancing disc 34, which are coaxially assembled together. The rotor stack 31, the first balancing disc 33 and the second balancing disc 34 are all mounted on the rotor shaft 32 so that they can rotate together. The first balancing disc 33 and the second balancing disc 34 are respectively located on both sides of the axial direction of the rotor stack 31.

[0058] like Figures 1A to 1D , Figure 1F and Figure 1G As shown, the rotor stack 31 includes a plurality of rotor units 31u, and each rotor unit 31u may include a sheet-like stack stacked together in the axial direction A. In this embodiment, the magnetic slots on which the magnets are installed in the plurality of rotor units 31u are staggered in the circumferential direction, so that the rotor 3 is constructed as a so-called skewed slot motor rotor. Each rotor unit 31u is formed with a weight-reducing hole 31h that passes through along the axial direction A. The weight-reducing holes 31h of the adjacent rotor units 31u in the axial direction A are slightly staggered in the circumferential direction but are connected to each other (see Figure 1E ), whereby the weight-reducing holes 31h of all rotor units 31u together form a second flow path P2 that penetrates the rotor stack 31. Further, the rotor shaft 32 passes through the rotor stack 31 and the two balancing discs 33 and 34, and an inner spline is formed at one axial end of the rotor shaft 32, and an outer spline is formed at the other axial end of the rotor shaft 32. Further, as Figure 2A and Figure 2B As shown, the first balancing disc 33 is formed in a circular ring shape and is fixedly mounted on the rotor shaft 32. The inner circumference of the first balancing disc 33 abuts against the rotor stack 31 from the other axial side. The outer circumference of the first balancing disc 33 has an axial limit portion 331 and an external spline 332 arranged side by side in the axial direction A. The axial limit portion 331 and the rotor stack 31 clamp the guide assembly 4 on both sides of the axial direction, and the external spline 332 is spline-matched with the guide assembly 4, thereby fixing the guide assembly 4 relative to the rotor 3. Further, as shown in FIG. Figure 3A and Figure 3B As shown, the second balancing disc 34 is formed in a circular ring shape and is fixedly mounted on the rotor shaft 32. The second balancing disc 34 abuts against the rotor stack 31 from one axial side, and is formed with a plurality of through holes 34h communicating with the corresponding second flow paths P2, so that the cooling fluid from the second flow path P2 can flow out of the rotor 3 through the through holes 34h.

[0059] In this embodiment, if Figures 1A to 1D , Figure 1F and Figure 1G As shown, the guide assembly 4 is sleeved on the rotor shaft 32 and is located on the other axial side of the rotor laminate 31. The guide assembly 4 is fixed relative to the rotor 3 through the first balancing disk 33 and the rotor laminate 31. Specifically, the guide assembly 4 includes a first guide ring 41 and a second guide ring 42 assembled together, and a plurality of chambers C1 and C2 are defined between the first guide ring 41 and the second guide ring 42. These chambers C1 and C2 are distributed spaced apart in the circumferential direction, and each chamber C1 and C2 is formed with an opening h2 that is open to the radial outside and opposite to the partial outlet h1 of the first flow path P1 in the radial direction R of the motor, so that part of the cooling fluid from the first flow path P1 can be sprayed into the plurality of chambers C1 and C2. As shown in FIG. Figure 1E As shown, a plurality of chambers C1 and C2 are distributed spaced apart in the circumferential direction and include a first chamber C1 and a second chamber C2. The first chamber C1 and the second chamber C2 are alternately arranged in the circumferential direction. The cooling fluid entering the first chamber C1 flows through the rotor laminate 31 via the second flow path P2. The cooling fluid entering the second chamber C2 is sprayed to the protruding portion 221 of the winding 22 via the spray hole 421h of the second guide ring 42 under the action of centrifugal force.

[0060] like Figure 4A and Figure 4BAs shown, the first guide ring 41 has a first circumferential wall 411, a first end wall 412, a plurality of partition walls 413 and a guide portion 414 that are formed integrally. The first circumferential wall 411 extends continuously along the entire circumference, and the first circumferential wall 411 extends obliquely toward the radial inside during the process of extending toward the rotor stack 31, which is conducive to the flow of cooling fluid toward the rotor stack 31. The first end wall 412 is bent toward the radial inside from one axial side end of the first circumferential wall 411 (the end close to the rotor stack 31). The first guide ring 41 has a bending portion formed at the edge of the first end wall 412 that stands upright toward the rotor stack 31, and the bending portion is used to separate the first end wall 412 from the second end wall 422 of the second guide ring 42 in the axial direction A. As shown Figure 5A and Figure 5B As shown, the second guide ring 42 has a second circumferential wall 421 and a second end wall 422 formed as one body. The second circumferential wall 421 extends continuously along the entire circumference, and the second circumferential wall 421 is substantially parallel to the first circumferential wall 411, so that it extends radially inwardly in the process of extending toward the rotor stack 31, which is conducive to the cooling fluid flowing toward the rotor stack 31. The second end wall 422 is bent from one axial side end of the second circumferential wall 421 (the end close to the rotor stack 31) toward the radial inside. As shown in FIG. Figures 1A to 1D , Figure 1F and Figure 1G As shown, the second peripheral wall 421 is located radially outside the first peripheral wall 411, and the second peripheral wall 421 and the first peripheral wall 411 are opposite to each other in the radial direction R, and a plurality of partition walls 413 stand up from the first peripheral wall 411 toward the second peripheral wall 421 and the plurality of partition walls 413 are distributed at intervals in the circumferential direction, so that the space between the first peripheral wall 411 and the second peripheral wall 421 is divided by the plurality of partition walls 413 to form a plurality of chambers C1 and C2. These chambers C1 and C2 include a first chamber C1 and a second chamber C2, as shown in FIG. Figure 1E As shown, the first chamber C1 is in communication with the second flow path P2, and the second peripheral wall 421 is also formed with an injection hole 421h in communication with the second chamber C2. Further, the first end wall 412 and the second end wall 422 are spaced apart and opposite to each other in the axial direction A, and a guide flow path P3 in communication with the first chamber C1 is defined between the first end wall 412 and the second end wall 422. The second end wall 422 abuts against the rotor laminated body 31 and is formed with a guide hole 422h that penetrates in the axial direction A, so that the cooling fluid from the first chamber C1 can be guided to the second flow path P2 via the guide flow path P3 and the guide hole 422h.

[0061] like Figures 1A to 1D , Figure 1F and Figure 1GAs shown, the guide portion 414 is connected to the other axial side end of the first peripheral wall 411, and the guide portion 414 extends obliquely toward the radial inside in the process of extending toward the rotor laminated body 31. The guide portion 414 is opposite to the outlet h1 of the first flow path P1 in the radial direction R, so that the cooling fluid from the first flow path P1 is ejected toward the radial inside, thereby flowing to the guide portion 414 through the opening h2, and then flowing into the plurality of chambers C1 and C2.

[0062] like Figures 1A to 1D , Figure 1F and Figure 1G As shown, the first end wall 412 is formed with a first internal spline 412t, and the second end wall 422 is formed with a second internal spline 422t. The first internal spline 412t and the second internal spline 422t are spline-matched with the external spline 332 of the first balancing disk 33, and the first end wall 412 and the second end wall 422 are both clamped by the rotor stack 31 and the limiting portion 331 in the axial direction A, thereby fixing the guide assembly 4 relative to the rotor 3.

[0063] By adopting the above scheme, after flowing through the first flow path P1 to cool the stator 2, the cooling fluid is ejected through the outlet h1 of the first flow path P1, a part of the cooling fluid is ejected from the radially outer side to the protruding portion 221 of the winding 22, and a part of the cooling fluid enters the multiple chambers C1 and C2 through the openings h2 of the multiple chambers. Further, the cooling fluid entering the first chamber C1 is guided to the second flow path P2 through the guide flow path P3 and the guide hole 422h, thereby cooling the rotor laminate 31. After flowing out of the second flow path P2, this part of the cooling fluid is discharged from the rotor 3 through the through hole 34h of the second balancing disk 34 and enters the housing 1. The radial inner side of the second chamber C2 is closed (including substantially closed), and the cooling fluid entering the second chamber C2 is ejected toward the radially outer side to the protruding portion 221 of the winding 22 through the injection hole 421h of the second guide ring 42 under the action of centrifugal force, thereby further cooling the winding 22.

[0064] It should be understood that the above embodiments are only exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application. The following is a supplementary description of the technical solution of the present application.

[0065] i. In the above specific embodiments, the electric bridge drive system is used as an example to illustrate the vehicle power system according to the present application, but the present application is not limited thereto. The vehicle power system may also be a hybrid power system.

[0066] ii. In the technical solution of the present application, a pumping mechanism may be included, and the pumping mechanism may include a pumping device (oil pump) and an oil circuit, etc., so that the cooling oil as a cooling fluid can be supplied via the input flow path of the housing 1 by using the pumping mechanism. In addition, an output flow path may be formed at the bottom of the housing 1 of the motor, and the output flow path may also be connected to the transmission, so that the cooling fluid after cooling the stator 2 and the rotor 3 can be returned to the housing of the transmission.

[0067] iii. It can be understood that in the technical solution of the present application, a flow path with a simple structure and a short length is set up to provide cooling fluid to the rotor 3, thereby simplifying the construction of the housing 1, the rotor 3 and the corresponding sealing structure, thereby reducing the corresponding cost and improving the stability of the entire system.

[0068] iv. In the illustrated example, the rotor shaft of the motor of the vehicle power system (electric bridge drive system) is coaxially arranged with the vehicle half shaft. The cooling structure of the motor disclosed in the embodiment of the present application can be advantageously applied to such a coaxial vehicle power system (electric bridge drive system), however, the application scenario of the present application is not limited thereto. For example, the cooling structure of the motor disclosed in the embodiment of the present application can be applied to an independent motor (i.e., a motor that is not assembled together with a speed change mechanism), an offset vehicle power system (electric bridge drive system), etc.

Claims

1. A motor, characterized in that: include: Housing (1); a stator (2) located in the housing (1) and fixed to the housing (1), wherein a first flow path (P1) is formed between the stator (2) and the housing (1); a rotor (3) located in the housing (1) and radially inward of the stator (2), the rotor (3) comprising a rotor stack (31) and a rotor shaft (32) fixed to each other, the rotor stack (31) forming a second flow path (P2) penetrating along the axial direction (A) of the motor; and A guide assembly (4) is sleeved on the rotor shaft (32), the guide assembly (4) is formed with a plurality of chambers (C1, C2), the plurality of chambers (C1, C2) are distributed at intervals in the circumferential direction of the motor, each of the chambers (C1, C2) is formed with an opening (h2) which is open to the radial outside and is opposite to the outlet (h1) of the first flow path (P1) in the radial direction (R) of the motor, so that the cooling fluid from the first flow path (P1) can be sprayed into the plurality of chambers (C1, C2), The multiple chambers (C1, C2) include a first chamber (C1) and a second chamber (C2), the first chamber (C1) is connected to the second flow path (P2), the guide component (4) is also formed with a spray hole (421h) connected to the second chamber (C2), the cooling fluid entering the first chamber (C1) flows through the rotor stack (31) via the second flow path (P2), and the cooling fluid entering the second chamber (C2) is sprayed onto the stator (2) via the spray hole (421h) under the action of centrifugal force.

2. The motor according to claim 1, characterized in that The first chambers (C1) and the second chambers (C2) are alternately arranged in the circumferential direction.

3. The motor according to claim 1, characterized in that The guide assembly (4) has a guide portion (414), and the guide portion (414) extends obliquely toward the radial inside in the process of extending toward the rotor stack (31). The guide portion (414) is opposite to the outlet (h1) of the first flow path (P1) in the radial direction (R), so that the cooling fluid from the first flow path (P1) can flow to the guide portion (414) through the opening (h2).

4. The electric machine according to any one of claims 1 to 3, characterized in that The guide assembly (4) comprises a first guide ring (41) and a second guide ring (42) assembled together, the first guide ring (41) having a first circumferential wall (411) extending continuously along the circumference over the entire circumference, the second guide ring (42) having a second circumferential wall (421) extending continuously along the circumference over the entire circumference, the second circumferential wall (421) and the first circumferential wall (411) being spaced apart and opposite to each other in the radial direction (R), the injection hole (421h) being formed in the second circumferential wall (421), The first guide ring (41) also has a plurality of partition walls (413), which extend from the first circumferential wall (411) toward the second circumferential wall (421) and are distributed at intervals in the circumferential direction, so that the space between the first circumferential wall (411) and the second circumferential wall (421) is separated by the plurality of partition walls (413) to form the plurality of chambers (C1, C2).

5. The motor according to claim 4, characterized in that The second peripheral wall (421) is located radially outside the first peripheral wall (411), and both the first peripheral wall (411) and the second peripheral wall (421) extend in an inclined manner radially inwardly in the process of extending toward the rotor stack (31).

6. The motor according to claim 4, characterized in that The first guide ring (41) has a first end wall (412) bent from one end of the first peripheral wall (411) toward the radial inside, and the second guide ring (42) has a second end wall (422) bent from one end of the second peripheral wall (421) toward the radial inside. The first end wall (412) and the second end wall (422) are spaced apart from each other in the axial direction (A) and are opposite to each other. A guide flow path (P3) communicating with the first chamber (C1) is defined between the first end wall (412) and the second end wall (422). The second end wall (422) abuts against the rotor stack (31) and is formed with a guide hole (422h), so that cooling fluid from the first chamber (C1) can be guided into the second flow path (P2) via the guide flow path (P3) and the guide hole (422h). The radially inner portion of the second chamber (C2) is closed.

7. The motor according to claim 6, characterized in that The rotor (3) comprises a first balancing disc (33), the first balancing disc (33) being fixedly mounted on the rotor shaft (32), the outer periphery of the first balancing disc (33) comprising an axial limiting portion (331) and an external spline (332) arranged side by side in the axial direction (A), The first end wall (412) is formed with a first internal spline (412t), and the second end wall (422) is formed with a second internal spline (422t). The first internal spline (412t) and the second internal spline (422t) are spline-matched with the external spline (332), and the first end wall (412) and the second end wall (422) are clamped by the rotor stack (31) and the axial limiting portion (331) in the axial direction (A).

8. The electric machine according to any one of claims 1 to 3, characterized in that The rotor stack (31) includes a plurality of rotor units (31u) stacked in the axial direction (A), each rotor unit (31u) is formed with a weight-reducing hole (31h) extending along the axial direction (A), and the weight-reducing holes (31h) of the rotor units (31u) adjacent to each other in the axial direction (A) are connected to form the second flow path (P2).

9. The motor according to claim 7, characterized in that The rotor (3) further comprises a second balancing disk (34), the second balancing disk (34) being fixedly mounted on the rotor shaft (32), and the second balancing disk (34) being formed with a through hole (34h) communicating with the second flow path (P2), so that the cooling fluid from the second flow path (P2) can flow out of the rotor (3) via the through hole (34h).

10. A vehicle power system, characterized in that: A motor comprising any one of claims 1 to 9.

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