Motor

Abstract

The utility model relates to a motor. The motor comprises a shell, a stator and a rotor, the shell comprises a hollow inner cavity, the stator is fixed in the inner cavity, the rotor is rotatably arranged on the radial inner side of the stator, the stator comprises a first end and a second end which are opposite in the axial direction, and the stator comprises an injection molding wrapping structure wrapping the stator. The motor further comprises a front bush and a rear bush which are coaxially arranged with the stator and are spaced apart from each other in the axial direction, the front bush is fixed to the radial inner side of the injection-molded coating structure at the first end, and the rear bush is fixed to the radial inner side of the injection-molded coating structure at the second end. The shell comprises a front supporting part protruding in the axial direction from the end wall, facing the first end, of the inner cavity and a rear supporting part protruding in the axial direction from the end wall, facing the second end, of the inner cavity. The stator is fixedly supported on the radial outer side of the front supporting part through a front bush and fixedly supported on the radial outer side of the rear supporting part through a rear bush. The motor provided by the utility model has an improved structure.

Description

Technical Field

[0001] This utility model relates to the field of motor technology. Specifically, this utility model relates to a motor with an improved structure. Background Technology

[0002] Currently, an increasing number of mechanical devices are using electric motors as drives. For example, in vehicle Movement De-Activation (MDA), electric motors are used to control the suspension. In such applications, the motor contains a working fluid (usually engine oil), thus placing high demands on its sealing. The motor stator is typically shaped using a potting process, and then an inner liner is inserted into the stator. The potting process is complex and makes it difficult to ensure product consistency. Furthermore, when the stator is installed in the housing, its positioning and sealing relative to the housing are achieved through the inner liner. In existing technology, the inner liner is usually a slender, thin-walled tube made of polyetheretherketone (PEEK). This type of inner liner requires very high dimensional accuracy; otherwise, it is difficult to insert into the stator, resulting in high processing difficulty, scrap rate, and production cost. Additionally, the sealing structure at both ends of the stator is complex, requiring the assembly of multiple parts, further increasing production costs. Utility Model Content

[0003] Therefore, the technical problem that this utility model needs to solve is to provide a motor with an improved structure.

[0004] The aforementioned technical problem is solved by an electric motor according to the present invention. The motor includes a housing, a stator, and a rotor. The housing includes a hollow inner cavity. The stator is fixed within the inner cavity of the housing. The rotor is rotatably arranged radially inside the stator. The stator includes a first end and a second end opposite each other along the axial direction. The stator includes an injection-molded covering structure that covers the stator. The motor also includes a front bushing and a rear bushing, respectively coaxially arranged with the stator and axially spaced apart from each other. The front bushing is fixed at its first end to the radially inner side of the injection-molded covering structure, and the rear bushing is fixed at its second end to the radially inner side of the injection-molded covering structure. The housing includes a front support portion protruding axially from the end wall facing the first end of the inner cavity and a rear support portion protruding axially from the end wall facing the second end of the inner cavity. The stator is fixedly supported radially outside the front support portion by the front bushing and radially outside the rear support portion by the rear bushing. Because the injection-molded covering structure of the stator is manufactured by injection molding, the bushing structure supporting the stator can be divided into two parts and can maintain coaxiality, which simplifies the structure and assembly process.

[0005] According to a preferred embodiment of the present invention, the motor may include one or more front sealing rings surrounding the radially outer side of the front support portion and one or more rear sealing rings surrounding the radially outer side of the rear support portion. At least one of the one or more front sealing rings can be axially pressed between the front bushing and the corresponding end wall of the inner cavity, and each of the one or more rear sealing rings is radially pressed between the rear bushing and the rear support portion. The rear bushing directly abuts against the corresponding end wall of the inner cavity axially. Sealing is achieved at both ends of the stator by the two sets of sealing rings, while axial positioning of the stator relative to the housing is achieved by the axially installed front sealing ring.

[0006] According to another preferred embodiment of the present invention, the one or more front sealing rings may include a first front sealing ring and a second front sealing ring. The first front sealing ring is axially pressed between the front bushing and the corresponding axial end wall of the inner cavity, and the second front sealing ring is radially pressed between the front bushing and the front support portion. The sealing effect of the stator front end is ensured by the two front sealing rings.

[0007] According to another preferred embodiment of the present invention, the front support portion may include a front annular groove recessed radially inward, a second front sealing ring disposed in the front annular groove, and / or, the rear support portion may include one or more rear annular grooves recessed radially inward, each of the one or more rear sealing rings disposed in a corresponding rear annular groove. Axial positioning of the sealing rings is achieved through the annular grooves.

[0008] According to another preferred embodiment of the present invention, the front bushing may include a first flange protruding radially outward from the axial end of the rear bushing. The first flange abuts against the corresponding axial end wall of the inner cavity on one axial side via a first front sealing ring, and abuts against the injection-molded covering structure on the other axial side. Alternatively, the rear bushing may include a second flange protruding radially outward from the axial end of the front bushing. The second flange directly abuts against the corresponding axial end wall of the inner cavity on one axial side, and abuts against the injection-molded covering structure on the other axial side. The stator can be positioned by abutting against the housing via the flange.

[0009] According to another preferred embodiment of the present invention, the motor may further include a temperature sensor, and the injection-molded overlay structure includes a recess formed at the first end, in which the temperature sensor is fixed. The recess formed in the injection-molded overlay structure facilitates the installation of the temperature sensor and also allows the temperature sensor to be closer to the heat-generating area.

[0010] According to another preferred embodiment of the present invention, the motor may further include an oil pressure sensor and an oil pressure sensor bracket, the oil pressure sensor bracket being fixed to the first end, and the oil pressure sensor being fixed to the oil pressure sensor bracket. The oil pressure sensor bracket can stably hold the oil pressure sensor.

[0011] According to another preferred embodiment of the present invention, the injection-molded overlay structure may include a lead groove formed at a first end, in which the lead of the oil pressure sensor is disposed. The lead can be conveniently positioned by means of the lead groove formed in the injection-molded overlay structure.

[0012] According to another preferred embodiment of the present invention, the lead grooves and recesses can be distributed circumferentially. This facilitates the layout of the leads and temperature sensor.

[0013] According to another preferred embodiment of the present invention, the motor may further include a busbar, and the injection-molded overlay structure may include a support pin protruding axially from the second end, with the busbar fixedly supported on the support pin. This ensures the installation stability of the busbar. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings. In the drawings, the same reference numerals represent elements with the same function. Wherein:

[0015] Figure 1 An exploded perspective view of an electric motor according to an exemplary embodiment of the present invention is shown.

[0016] Figure 2 A longitudinal sectional view of an electric motor according to an exemplary embodiment of the present invention is shown;

[0017] Figure 3 A partial exploded view of an electric motor according to an exemplary embodiment of the present invention is shown;

[0018] Figure 4 A perspective view of the stator of an electric motor according to an exemplary embodiment of the present invention is shown; and

[0019] Figure 5 A perspective view of the stator of an electric motor according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0020] The following describes specific embodiments of the motor according to the present invention with reference to the accompanying drawings. The detailed description and drawings below are provided to exemplify the principles of the present invention. The present invention is not limited to the described preferred embodiments, and the scope of protection of the present invention is defined by the claims.

[0021] According to an embodiment of the present invention, an electric motor for operation in an environment in the presence of a working fluid is provided. Figures 1 to 5 An exemplary embodiment of the motor according to the present invention is shown.

[0022] Figure 1 and Figure 2 An exploded perspective view and a longitudinal sectional view of the motor according to an exemplary embodiment are shown, respectively. (See attached diagram.) Figure 1 and Figure 2 As shown, the motor includes a housing 10, a stator 20, a rotor 30, and a motor shaft 40. The housing 10 is formed with a hollow internal cavity. Specifically, the housing 10 may include a housing body 11 and a front cover 12. The housing 10 may be formed as a generally hollow cylindrical structure having two axially opposed ends, one of which is an open end and is closed by the front cover 12. The front cover 12 defines one axial end wall of the internal cavity, while the housing body 11 defines the other axial end wall of the internal cavity.

[0023] The stator 20 is formed into a generally hollow cylindrical structure. The stator 20 includes a stator core and coil windings wound around the stator core. Furthermore, the stator 20 also includes an injection-molded overlay structure. The injection-molded overlay structure is a structure formed by injection molding material through an injection molding process, covering the entire surface of the stator 20, thereby filling the gap between the stator core and the coil windings. Unlike the potting overlay structure used in the prior art, which is made by a potting process, the manufacturing process of the injection-molded overlay structure is simpler. For example... Figure 2 As shown, the stator 20 includes two opposite ends along the axial direction, wherein the end facing the front cover 12 can be referred to as the first end, and the other end facing away from the front cover 12 can be referred to as the second end.

[0024] The stator 20 is fixedly mounted in the hollow cavity of the housing 10. The rotor 30 is formed into a generally cylindrical structure, coaxially mounted on the radially inner side of the stator 20, and is capable of rotating relative to the stator 20 about a common central axis. The motor shaft 40 is formed into an elongated cylindrical structure, coaxially passing through the rotor 30 along the axial direction and fixed relative to the rotor 30. The two axial ends of the motor shaft 40 protrude axially from the rotor 30 and are rotatably supported on the housing 10, so that the rotor 30 and the motor shaft 40 can rotate synchronously relative to the housing 10 and the stator 20.

[0025] The motor also includes a front bushing 50a and a rear bushing 50b. These bushings can be formed from, for example, a metal material by stamping or machining. The front bushing 50a and rear bushing 50b are each formed as generally cylindrical components, and are respectively fixed to the radially inner side of the stator 20 during the injection molding process that forms the injection-molded overlay structure of the stator 20. The front bushing 50a and rear bushing 50b are coaxially arranged with the stator 20 and axially spaced apart from each other, wherein the front bushing 50a is fixed to the radially inner side of the injection-molded overlay structure at a first end of the stator 20, and the rear bushing 50b is fixed to the radially inner side of the injection-molded overlay structure at a second end of the stator 20. The stator 20 is fixedly supported on the housing 10 by the two bushings at both ends. Specifically, a front support portion 13 protruding axially is formed on the end wall (surface of the front cover 12) of the inner cavity facing the first end of the stator 20, and a rear support portion 14 protruding axially is formed on the end wall (surface of the housing body 11) of the inner cavity facing the second end of the stator 20. The front support portion 13 and the rear support portion 14 are each formed into a generally cylindrical structure. The motor shaft 40 can extend to and is rotatably supported radially inside the two supports. The stator 20 is fixedly supported radially outside the front support portion 13 by a front bushing 50a and radially outside the rear support portion 14 by a rear bushing 50b. Since the positions of the two bushings relative to the stator 20 are determined by the mold during the injection molding process, good coaxiality of the two bushings can be ensured, thereby ensuring accurate radial positioning of the stator 20 relative to the housing 10.

[0026] The motor according to this invention is used in environments where a working fluid (engine oil) is present. For example... Figure 2As shown, the motor shaft 40 is formed as a hollow shaft. One end of the motor shaft 40 passes axially through the front support portion 13 and protrudes beyond the front end cover 12. Working fluid can enter the motor shaft 40 from this end and flow into the housing 10 from the other end of the motor shaft 40, thereby filling the space between the stator 20 and the rotor 30. To prevent leakage of working fluid inside the stator 20, a sealing structure is required between the two supports and the two bushings. For this purpose, in a preferred embodiment, the motor includes one or more front sealing rings surrounding the radially outer side of the front support portion 13 and one or more rear sealing rings 60c surrounding the radially outer side of the rear support portion 14. Each sealing ring is an annular component formed of an elastic material such as rubber. Each front sealing ring forms a seal between the front end cover 12 and the front bushing 50a. On one hand, at least one of the front sealing rings is axially pressed between the front bushing 50a and the corresponding end wall of the inner cavity (provided by the front cover 12), such that the front bushing 50a indirectly abuts against the corresponding end wall of the inner cavity axially via this front sealing ring; on the other hand, each rear sealing ring 60c is radially pressed between the rear bushing 50b and the rear support portion 14, while the rear bushing 50b directly abuts against the corresponding end wall of the inner cavity axially. The front sealing rings abutting against the end wall of the front bushing 50a axially can compensate for the axial clearance between the stator 20 and the inner cavity. In this case, the stator 20 is axially positioned relative to the housing 10 via the two bushings and the front sealing ring.

[0027] Preferably, the motor may include multiple front seals and / or multiple rear seals to improve the sealing effect. For example... Figure 2 As shown, in a specific embodiment, the motor may include two front sealing rings, referred to as the first front sealing ring 60a and the second front sealing ring 60b, respectively. The first front sealing ring 60a is axially pressed between the end of the front bushing 50a and the corresponding axial end wall of the inner cavity, while the second front sealing ring 60b is radially pressed between the inner side wall of the front bushing 50a and the outer side wall of the front support portion 13. Figure 2 As shown, the motor may also include multiple (e.g., two shown in the figure) rear seals 60c, which are radially pressed between the rear bushing 50b and the rear support 14 and axially spaced from each other. For each radially pressed front and rear seal, an annular groove can be provided on the corresponding support to mount the seal, thereby facilitating axial positioning of the seal. Specifically, a front annular groove 15 recessed towards the radially inward side can be formed on the radially outer side of the front support 13, and a second front seal 60b can be disposed in the front annular groove 15; similarly, a rear annular groove 16 corresponding to the number of rear seals 60c can be formed on the radially outer side of the rear support 14, each rear annular groove 16 recessed towards the radially inward side, and each rear seal 60c disposed in a corresponding rear annular groove 16.

[0028] In a preferred embodiment, the front bushing 50a may include a first flange 51a projecting radially outward from an axial end facing away from the rear bushing 50b. The first flange 51a abuts axially against a corresponding axial end wall of the cavity on one axial side via a first front sealing ring 60a, and abuts axially against the injection-molded overlay structure of the stator 20 on the other axial side. The first front sealing ring 60a may be axially clamped between the first flange 51a and the end wall of the cavity. Similarly, the rear bushing 50b may include a second flange 51b projecting radially outward from an axial end facing away from the front bushing 50a. The second flange 51b abuts directly axially against a corresponding axial end wall of the cavity on one axial side, and abuts axially against the injection-molded overlay structure of the stator 20 on the other axial side.

[0029] In a preferred embodiment, the motor may further include one or more temperature sensors 70 for detecting the temperature of the motor (particularly the stator 20). Figure 3 and Figure 4 As shown, to facilitate the installation of the temperature sensor 70, the injection-molded overlay structure of the stator 20 may have one or more recesses 17 formed at the first end, with each temperature sensor 70 fixedly mounted in a corresponding recess 17. The recesses 17 can be integrally formed during the injection molding of the overlay structure. Each recess 17 can be located near a heat-concentrating area of ​​the stator 20, such as the center of the stator core and / or near the coil windings. Cables connecting the temperature sensors 70 can also be arranged in and fixed within the recesses 17. This reduces the risk of sensor and cable movement and damage.

[0030] In a preferred embodiment, the motor may further include an oil pressure sensor 80 and an oil pressure sensor bracket 81. For example... Figure 3 As shown, the hydraulic pressure sensor bracket 81 is fixed to the first end of the stator 20, and the hydraulic pressure sensor 80 is fixed to the hydraulic pressure sensor bracket 81, and then fixed to the stator 20 through the hydraulic pressure sensor bracket 81. Preferably, the injection-molded overlay structure of the stator 20 can form a lead groove 18 at the first end, and the lead wire of the hydraulic pressure sensor 80 can be disposed in the lead groove 18. Preferably, the lead groove 18 and the recess 17 can be distributed circumferentially.

[0031] In a preferred embodiment, the motor may further include a busbar 90. For example... Figure 5 As shown, the injection-molded overlay structure of the stator 20 may have one or more support pins 19 protruding axially from the end face of the second end, and the busbar 90 is fixedly supported on these support pins 19. The support pins 19 may be integrally formed during the injection molding of the injection-molded overlay structure of the stator 20. The busbar 90 may be fixed to the support pins 19, for example, by riveting or clamping. When multiple support pins 19 are present, these support pins 19 are preferably circumferentially spaced, particularly evenly spaced.

[0032] In the motor according to this invention, two separate bushings replace the conventional single slender inner bushing. These two bushings can be directly fixed to the stator's injection-molded structure during the injection molding process, ensuring concentricity, reducing component costs, and improving assembly efficiency. The fit between the bushings and the sealing ring ensures the stator's sealing effect, effectively preventing leakage of the working fluid. Furthermore, the stator's injection-molded structure can provide space for the installation of a temperature sensor, thus better protecting the sensor and its cables. The stator's injection-molded structure also provides a fixing and supporting structure for the busbar, thereby improving the busbar's installation stability.

[0033] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of the embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of this invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes, particularly regarding the function and structure of the components, can be made without departing from the scope of the claims.

[0034] Appendix Label Table

[0035] 10. Shell

[0036] 11. Main body of the shell

[0037] 12 Front Cover

[0038] 13 Front support section

[0039] 14 Rear Support Section

[0040] 15. Front annular groove

[0041] 16 Rear circumferential groove

[0042] 17 recess

[0043] 18 lead wire slots

[0044] 19 Support pins

[0045] 20 stators

[0046] 30 rotors

[0047] 40 motor shaft

[0048] 50a front bushing

[0049] 51a First flange

[0050] 50b rear bushing

[0051] 51b Second flange

[0052] 60a First front seal ring

[0053] 60b Second front seal ring

[0054] 60c rear seal ring

[0055] 70 Temperature Sensor

[0056] 80 Oil pressure sensor

[0057] 81 Oil pressure sensor bracket

[0058] 90 busbar

Claims

1. An electric motor comprising a housing (10), a stator (20), and a rotor (30), wherein the housing (10) includes a hollow inner cavity, the stator (20) is fixed in the inner cavity, and the rotor (30) is rotatably arranged radially inside the stator (20), the stator (20) including a first end and a second end opposite each other along the axial direction, characterized in that, The stator (20) includes an injection-molded covering structure covering the stator (20). The motor also includes a front bushing (50a) and a rear bushing (50b) arranged coaxially with the stator (20) and spaced apart from each other axially. The front bushing (50a) is fixed to the radially inner side of the injection-molded covering structure at the first end, and the rear bushing (50b) is fixed to the radially inner side of the injection-molded covering structure at the second end. The housing (10) includes a front support portion (13) that protrudes axially from the end wall of the inner cavity facing the first end and a rear support portion (14) that protrudes axially from the end wall of the inner cavity facing the second end. The stator (20) is fixedly supported radially outside the front support portion (13) by the front bushing (50a) and fixedly supported radially outside the rear support portion (14) by the rear bushing (50b).

2. The motor according to claim 1, characterized in that, The motor includes one or more front sealing rings surrounding the radially outer side of the front support (13) and one or more rear sealing rings (60c) surrounding the radially outer side of the rear support (14). At least one of the one or more front sealing rings is axially pressed between the front bushing (50a) and the corresponding end wall of the inner cavity. Each of the one or more rear sealing rings (60c) is radially pressed between the rear bushing (50b) and the rear support (14). The rear bushing (50b) directly abuts against the corresponding end wall of the inner cavity axially.

3. The motor according to claim 2, characterized in that, The one or more front sealing rings include a first front sealing ring (60a) and a second front sealing ring (60b), the first front sealing ring (60a) being axially pressed between the front bushing (50a) and the corresponding axial end wall of the inner cavity, and the second front sealing ring (60b) being radially pressed between the front bushing (50a) and the front support portion (13).

4. The motor according to claim 3, characterized in that, The front support portion (13) includes a front annular groove (15) recessed toward the radially inward side, in which the second front sealing ring (60b) is disposed, and / or, the rear support portion (14) includes one or more rear annular grooves (16) recessed toward the radially inward side, in which each of the one or more rear sealing rings (60c) is disposed.

5. The motor according to claim 3, characterized in that, The front bushing (50a) includes a first flange (51a) that protrudes radially outward from an axial end opposite to the rear bushing (50b). The first flange (51a) abuts axially against the corresponding axial end wall of the inner cavity via the first front sealing ring (60a) on one axial side and abuts axially against the injection-molded overlay structure on the other axial side. And / or, the rear bushing (50b) includes a second flange (51b) that protrudes radially outward from an axial end opposite to the front bushing (50a). The second flange (51b) abuts directly axially against the corresponding axial end wall of the inner cavity on one axial side and abuts axially against the injection-molded overlay structure on the other axial side.

6. The motor according to claim 1, characterized in that, The motor also includes a temperature sensor (70), and the injection-molded overlay structure includes a recess (17) formed at the first end, wherein the temperature sensor (70) is fixed in the recess (17).

7. The motor according to claim 6, characterized in that, The motor also includes an oil pressure sensor (80) and an oil pressure sensor bracket (81), the oil pressure sensor bracket (81) being fixed to the first end, and the oil pressure sensor (80) being fixed to the oil pressure sensor bracket (81).

8. The motor according to claim 7, characterized in that, The injection-molded overlay structure includes a lead groove (18) formed at the first end, and the lead of the oil pressure sensor (80) is disposed in the lead groove (18).

9. The motor according to claim 8, characterized in that, The lead groove (18) and the recess (17) are distributed circumferentially.

10. The motor according to any one of claims 1 to 9, characterized in that, The motor also includes a busbar (90), and the injection-molded overlay structure includes a support pin (19) protruding axially from the second end, and the busbar (90) is fixedly supported on the support pin (19).

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