Motor and electric vehicle

Abstract

The utility model provides a motor and an electric vehicle. The motor comprises a cylindrical outer shell and a stator assembly. The inner peripheral wall of the outer shell is provided with a groove structure, and the inner peripheral wall of the outer shell is in interference fit with the outer peripheral wall of the stator assembly; the groove structure comprises an annular groove body surrounding the inner circumferential wall of the outer shell, an oil inlet formed in the annular groove body and at least one branch communicating with the annular groove body. The oil inlet penetrates through the outer shell, and the two ends of the oil inlet are connected with the annular groove body and an external oil supply pipe respectively. The inner circumferential wall of the outer shell of the motor is provided with the groove structure, when the outer shell is in interference fit with the periphery of the stator assembly, the groove structure can serve as a cooling channel, and after cooling oil is introduced into the groove structure, the groove structure can play a role in cooling the structure of the motor, and the service life of the motor is prolonged. The cooling channel provided by the utility model is simple in preparation process, and improves the comprehensive efficiency and the overall performance of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically, to a motor and an electric vehicle. Background Art

[0002] With the development of electric vehicles, the demand for miniaturization of motors in their powertrains is increasing day by day. Correspondingly, the power density of motors has also been improved. With the improvement of power density, the heat dissipation efficiency of motors has become a technical problem to be solved urgently.

[0003] In the existing technology, water-cooling heat dissipation technology or oil-cooling heat dissipation technology is used for heat dissipation of motors. The power density of water-cooling heat dissipation is relatively low. Moreover, since cooling water has no insulation property and cannot be directly in contact with motor components, the thermal resistance of the water-cooling link is large. In addition, the water-cooling technology has high requirements for the structural accuracy of motor components. The oil-cooling heat dissipation technology is an alternative technical solution for heat dissipation of motors. However, in the existing technical solutions, the oil distribution is uneven, and the cooling effects in different regions are different, which easily leads to local overheating. Therefore, it is urgent to develop a motor structure with high cooling efficiency.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present utility model. Therefore, it may include information that does not constitute the prior art known to those skilled in the art. Summary of the Utility Model

[0005] Aiming at the problems in the existing technology, the purpose of the present utility model is to provide a motor and an electric vehicle. A groove structure provided on the inner peripheral wall of the outer shell of the motor can form a cooling channel in cooperation with the outer periphery of the stator assembly. Optimizing the groove structure can greatly improve the efficiency of cooling the motor, thereby improving the stability of motor operation and the overall performance of the motor.

[0006] The first aspect of the present utility model provides a motor, including a cylindrical outer shell and a stator assembly;

[0007] The inner peripheral wall of the outer shell is provided with a groove structure, and the inner peripheral wall of the outer shell is in interference fit with the outer peripheral wall of the stator assembly;

[0008] The groove structure includes an annular groove body surrounding the inner peripheral wall of the outer shell, an oil inlet provided on the annular groove body, and at least one branch communicating with the annular groove body;

[0009] The oil inlet penetrates through the outer shell, and both ends of the oil inlet are respectively connected to the annular groove body and an external oil supply pipe.

[0010] According to the first aspect of the present utility model, the groove structure includes a plurality of branches;

[0011] A plurality of the branch paths are arranged on both sides of the annular groove body.

[0012] According to the first aspect of the present invention, the groove structure includes a plurality of branch paths;

[0013] A plurality of the branch paths are arranged at equal intervals in the circumferential direction of the annular groove body.

[0014] According to the first aspect of the present invention, at least one of the branch paths is obtained by a die-casting process.

[0015] The second aspect of the present invention provides an electric vehicle, including the motor as described above arranged inside the electric vehicle.

[0016] According to the second aspect of the present invention, the motor is used to drive the electric vehicle to travel;

[0017] The axis of the motor is parallel to the horizontal plane;

[0018] One end of the oil inlet connected to the external oil supply pipe is at the lowest position.

[0019] According to the second aspect of the present invention, the groove structure includes a plurality of branch paths;

[0020] A plurality of the branch paths are arranged above the cross-section of the motor.

[0021] According to the second aspect of the present invention, the groove structure includes a plurality of branch paths;

[0022] Each of the branch paths is arranged at a different height, and its cross-sectional area becomes smaller as the height of the branch path becomes smaller.

[0023] According to the second aspect of the present invention, the groove structure includes seven branch paths;

[0024] Seven of the branch paths are circumferentially and evenly arranged above the cross-section of the motor.

[0025] According to the second aspect of the present invention, the seven branch paths include a first branch path arranged at the topmost, two second branch paths with a central angle of 30° with respect to the first branch path, two third branch paths with a central angle of 60° with respect to the first branch path, and two fourth branch paths arranged on the cross-section of the motor;

[0026] The cross-section of the second branch path is 95% of the cross-section of the first branch path;

[0027] The cross-section of the third branch path is 95% of the cross-section of the second branch path; and

[0028] The cross-section of the fourth branch path is 95% of the cross-section of the third branch path.

[0029] According to a second aspect of the present utility model, the stator assembly includes a stator core;

[0030] The groove structure includes a plurality of branches;

[0031] The plurality of branches are disposed on both sides of the annular groove body;

[0032] The span of the branches on both sides of the annular groove body in the axial direction of the motor is greater than the length of the stator core in the axial direction of the motor.

[0033] A groove structure is provided on the inner peripheral wall of the outer casing of the motor of the present utility model. When the outer casing is in interference fit with the outer periphery of the stator assembly, the groove structure can serve as a cooling channel. When cooling oil is introduced into it, it can play a role in cooling the structure of the motor. The preparation process of the cooling channel of the present utility model is simple while improving the comprehensive efficiency and overall performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects, and advantages of the present utility model will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0035] Figure 1 A side view of the motor according to an embodiment of the present utility model;

[0036] Figure 2 A schematic structural view of the outer casing of the motor according to an embodiment of the present utility model; and

[0037] Figure 3 A schematic structural view of the cooling channel formed by the groove structure of the motor according to another embodiment of the present utility model. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The embodiments described by referring to the accompanying drawings below are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model. Identical reference numerals in the figures denote identical or similar structures, and thus their repeated description will be omitted.

[0039] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0042] Aiming at the existing technical problems, the present utility model provides a motor and an electric vehicle. The motor includes a cylindrical outer housing and a stator assembly; a groove structure is provided on the inner peripheral wall of the outer housing; the groove structure includes an annular groove body surrounding the inner peripheral wall of the outer housing, an oil inlet provided on the annular groove body, and at least one branch communicating with the annular groove body; the oil inlet penetrates the outer housing, and both ends of the oil inlet are respectively connected to the annular groove body and an external oil supply pipe. The groove structure is provided on the inner peripheral wall of the outer housing of the motor of the present utility model. When the outer housing and the outer periphery of the stator assembly are in interference fit, the groove structure can serve as a cooling channel. When cooling oil is introduced into it, it can play a role in cooling the structure of the motor. The cooling channel preparation process of the present utility model is simple while improving the comprehensive efficiency and overall performance of the motor.

[0043] The following further elaborates on the structure of a motor and an electric vehicle according to the present utility model in conjunction with the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the protection scope of the present utility model.

[0044] Figure 1 FIG. 4 is a side view of a motor according to an embodiment of the present utility model. Specifically, the motor includes a cylindrical outer housing 1 and a stator assembly 2, and the inner peripheral wall of the outer housing 1 is fixedly connected to the outer periphery of the stator assembly 2 by interference fit.

[0045] Figure 2 FIG. 8 is a schematic structural view of the outer housing of a motor according to an embodiment. The inner peripheral wall of the outer housing is provided with a groove structure. When the inner peripheral wall of the outer housing 1 is fixedly connected to the outer periphery of the stator assembly 2 by interference fit, the groove structure forms a cooling channel through which cooling oil can pass. The groove structure includes an annular groove body 10 surrounding the inner peripheral wall of the outer housing 1, an oil inlet 30 provided on the annular groove body 10, and a plurality of branch channels 20 / 20' communicating with the annular groove body 10. The branch channels 20 / 20 are strip-shaped grooves. The oil inlet 30 penetrates the outer housing 1, and both ends of the oil inlet 30 are respectively connected to the annular groove body 10 and a stator flow channel 40, and are connected to an external oil supply pipe through the stator flow channel 40.

[0046] Figure 2 In the embodiment, the groove structure includes a plurality of branch channels 20 / 20'. Here, the branch channels of the annular groove body 10 are respectively marked, that is, a plurality of the branch channels are provided on both sides of the annular groove body 10. In some embodiments, only a plurality of branch channels may be provided on one side of the annular groove body 10. The plurality of branch channels 20 and the plurality of branch channels 20' may be cross-arranged on both sides of the annular groove body 10, or as Figure 2 shown, a branch channel 20 and a branch channel 20' are symmetrically arranged on both sides of the annular groove body 10. The plurality of branch channels may be arranged perpendicular to the annular groove body 10 and extend along the axis direction of the motor. The annular groove body may be formed on the outer housing of the motor by machining, and the plurality of branch channels may be formed by die casting.

[0047] In order to cool the motor more evenly, the plurality of branch channels of the groove structure may be arranged at equal intervals in the circumferential direction of the annular groove body 10. The annular groove body 10 may be arranged perpendicular to the axis of the motor. The annular groove body 10 and the plurality of... thereon provide circumferential cooling of the motor. The cross-sectional area (groove depth / width) of the annular groove body, the cross-sectional area (groove depth / width) of the branch channels, the extension length of the branch channels, the number of branch channels, and the position where the branch channels are connected to the annular groove body may be determined through experiments according to the specific structure of the motor or the cooling effect to be achieved by the motor.

[0048] The present utility model further provides an electric vehicle, which includes a motor disposed inside the electric vehicle. The motor is used to drive the electric vehicle to travel. Of course, the electric vehicle may further include a battery, which is electrically connected to the motor and used to drive the motor to operate. The motor can be horizontally disposed inside the electric vehicle, that is, the axis of the motor can be parallel to the horizontal plane. One end of the oil inlet 30 connected to the external oil supply pipe is at the lowest position, as shown in Figure 1 , the groove structure includes a plurality of branches; in this embodiment, the oil inlet 30 is disposed at the bottom in the direction of gravity. When the motor of the electric vehicle operates, the cooling oil flows upward along the oil inlet 30 from the bottom and enters the annular groove body 10, and is transported to each branch communicating therewith through the annular groove body 10. Since the branches are circumferentially and uniformly distributed on the inner peripheral wall of the outer housing, correspondingly, the circumference of the motor can be evenly cooled. In one embodiment, in order to allow the cooling oil to cool both ends of the stator core from the branches, the span of the branches on both sides of the annular groove body 10 in the axial direction of the motor is greater than the length of the stator core in the axial direction of the motor, that is, the branches on both sides of the annular groove body 10 extend in the axial direction of the motor and exceed both ends of the stator core. In the above structure, the cooling oil is sprayed onto the stator windings of the stator assembly through each branch. At the same time, the bearing torque between the stator core and the outer housing is not affected by the missing contact area due to the formation of the cooling flow channel.

[0049] Figure 3 FIG. is a schematic structural diagram of a cooling channel formed by a groove structure of a motor according to another embodiment of the present utility model. The groove structure includes a plurality of branches, and the plurality of branches are disposed above the cross section (a plane passing through the axis of the motor and parallel to the horizontal plane) of the motor. Each of the branches is disposed at a different height, and its cross-sectional area decreases as the height of the branch decreases. To Figure 3Taking the embodiment as an example, the groove structure includes an annular groove body 10 and seven branch paths. The branch paths are arranged on both sides of the annular groove body 10, and the branch paths on both sides are symmetrically arranged. The seven branch paths are circumferentially and evenly arranged above the cross-section of the motor. The branch paths arranged at different heights are respectively defined as the first branch path 20a, the second branch path 20b, the third branch path 20c, and the fourth branch path 20d. Here, the height refers to the vertical distance from the branch path to the horizontal ground when the axis of the motor is parallel to the horizontal plane. The first branch path 20a is located at the top of the motor. The heights of the two second branch paths 20b, the two third branch paths 20c, and the two fourth branch paths 20d decrease in sequence. The above-mentioned branch paths are arranged above the cross-section of the motor and are equally spaced, that is, the fourth branch path 20d is arranged on the cross-section of the motor, and the central angle corresponding to the arc between two adjacent branch paths is 30°. At the same time, the cross-section of the topmost first branch path 20a is the largest. The cross-section of the second branch path 20b is 95% of the cross-section of the first branch path 20a. The cross-section of the third branch path 20c is 95% of the cross-section of the second branch path 20b. The cross-section of the fourth branch path 20d is 95% of the cross-section of the third branch path 20c. The gradual change of the cross-sections of the above-mentioned branch paths is used to offset the non-uniformity of the cooling effect caused by gravity and improve the uniformity of motor cooling.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0051] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A motor, characterized in that: comprising a cylindrical outer shell and a stator assembly; The inner peripheral wall of the outer shell is provided with a groove structure, and the inner peripheral wall of the outer shell is interference-fitted with the outer peripheral wall of the stator assembly; The groove structure includes an annular groove body surrounding the inner peripheral wall of the outer shell, an oil inlet provided in the annular groove body, and at least one branch communicating with the annular groove body; The oil inlet passes through the outer shell, and two ends of the oil inlet are respectively connected to the annular groove body and the external oil supply pipe.

2. The motor according to claim 1, characterized in that The groove structure includes a plurality of branches; The plurality of branches are arranged on both sides of the annular groove body.

3. The motor according to claim 1, characterized in that The groove structure includes a plurality of branches; The plurality of branches are arranged at equal intervals in the circumferential direction of the annular groove body.

4. The motor according to claim 1, characterized in that The at least one branch is obtained by a die-casting process.

5. An electric vehicle, characterized in that: The invention comprises a motor as claimed in any one of claims 1 to 4 arranged in an electric vehicle.

6. The electric vehicle according to claim 5, characterized in that: The motor is used to drive the electric vehicle to travel; The axis of the motor is parallel to the horizontal plane; One end of the oil inlet connected to the external oil supply pipe is at the lowest position.

7. The electric vehicle according to claim 6, characterized in that: The groove structure includes a plurality of branches; The plurality of branches are arranged above the cross section of the motor.

8. The electric vehicle according to claim 6, characterized in that: The groove structure includes a plurality of branches; Each branch is arranged at a different height, and the cross-sectional area of ​​the branch decreases as the height of the branch decreases.

9. The electric vehicle according to claim 7, characterized in that: The groove structure includes seven branches; The seven branches are evenly arranged circumferentially above the cross section of the motor.

10. The electric vehicle according to claim 9, characterized in that: The seven branches include a first branch arranged at the top, two second branches forming an arc center angle of 30° with the first branch, two third branches forming an arc center angle of 60° with the first branch, and two fourth branches arranged at the cross section of the motor; The cross section of the second branch is 95% of the cross section of the first branch; The cross-section of the third branch is 95% of the cross-section of the second branch; and The cross section of the fourth branch is 95% of the cross section of the third branch.

11. The electric vehicle according to claim 6, characterized in that: The stator assembly includes a stator core; The groove structure includes a plurality of branches; A plurality of said branches are arranged on both sides of said annular groove body; The span of the branches on both sides of the annular groove body in the axial direction of the motor is greater than the length of the stator core in the axial direction of the motor.

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