Rotor mechanism and motor

Abstract

The utility model relates to a rotor mechanism and a motor. The rotor mechanism comprises a shell assembly which comprises a shell and a bending body which are connected with each other, and the bending body can be bent relative to the shell; and the rotor iron core is sleeved in the shell, and a bending body which is bent by a certain angle relative to the shell can generate abutting force on the rotor iron core along the axial direction of the rotor mechanism. The bending body is bent relative to the shell, so that the bending body generates abutting force on the rotor iron core along the axial direction of the rotor mechanism, the axial direction of the rotor iron core is well positioned, and displacement of the rotor iron core along the axial direction of the rotor mechanism is avoided. Therefore, on one hand, the rotor iron core forms a good fixing relation relative to the shell, the rotor iron core is prevented from generating displacement relative to the shell to form looseness, the abnormality or failure of the rotor mechanism is effectively avoided, and the working reliability of the rotor mechanism is improved. And on the other hand, the shell assembly is simple in structure, and the assembling difficulty of the rotor mechanism can be reduced, so that the manufacturing cost of the whole rotor mechanism is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a rotor mechanism and a motor including the rotor mechanism. Background Art

[0002] Electric motors have a wide variety of applications. They typically consist of a rotor and a stator. The stator drives the rotor, which rotates. The rotor's core is fixed to the housing, which acts as a carrier for the core. However, with traditional rotors, the core can easily become loose relative to the housing, causing the rotor to malfunction or fail, thereby compromising the reliability of the rotor and motor. Even if the core's stability can be maintained, this significantly increases the rotor's manufacturing cost, making it difficult for traditional rotors to achieve both reliability and cost-effectiveness. Utility Model Content

[0003] A technical problem solved by this application is how to improve the reliability of the rotor mechanism while reducing the manufacturing cost.

[0004] A rotor mechanism, comprising:

[0005] A shell assembly, comprising a shell and a bending body connected to each other, wherein the bending body can bend relative to the shell; and

[0006] The rotor core is sleeved in the shell, and the bent body bent at a certain angle relative to the shell can generate abutting force on the rotor core along the axial direction of the rotor mechanism.

[0007] In one embodiment, the shell assembly further includes a limiting protrusion, which is protrudingly provided on the inner circumferential surface of the shell, and a limiting groove is formed on the outer circumferential surface of the rotor core, and the limiting protrusion cooperates with the limiting groove.

[0008] In one embodiment, the shell assembly further includes a support protrusion, which is protruding relative to the inner circumferential surface of the shell, and the rotor core abuts between the support protrusion and the bending body along the axial direction of the rotor mechanism, and the support protrusion is protruding on the limiting protrusion.

[0009] In one embodiment, a magnetic steel is further included. A mounting groove is provided on the rotor core. The magnetic steel cooperates with the mounting groove and abuts against the housing along the axial direction of the rotor mechanism.

[0010] In one embodiment, the rotor core includes a core body and a mounting unit, the mounting unit includes two mounting blocks spaced apart along the circumference of the core body, the two mounting blocks form the mounting groove, the mounting block includes a mounting portion and a stop portion, the mounting portion is protrudingly provided on the core body, the stop portion is connected to an end of the mounting portion away from the core body at an angle, the mounting portion abuts against the magnetic steel along the circumference of the rotor mechanism, and the stop portion abuts against the magnetic steel along the radial direction of the rotor mechanism.

[0011] In one embodiment, an isolation groove exists between two adjacent mounting units arranged along the circumference of the rotor mechanism.

[0012] In one embodiment, a positioning sleeve is further included, which is arranged on the rotor core and abuts against the rotor core and the magnetic steel along the axial direction of the rotor mechanism. The bent body can abut against the positioning sleeve along the axial direction of the rotor mechanism.

[0013] In one embodiment, the shell is surrounded by a first cavity and a second cavity which are coaxially arranged, the bottom wall surface of the first cavity includes a step surface arranged around the second cavity, and the rotor core is partially accommodated in the second cavity; the positioning sleeve includes a cylinder and a cover plate, the cylinder is sleeved outside the rotor core and accommodated in the first cavity, and the cylinder abuts against the step surface, and the cover plate abuts against the rotor core and the magnet along the axial direction of the rotor mechanism.

[0014] In one embodiment, a first avoidance groove is formed on a side of the cover plate away from the cylinder, and a second avoidance groove is formed on a side of the cover plate close to the cylinder, and the bending body is accommodated in the second avoidance groove.

[0015] A motor comprises a stator mechanism and any one of the above-mentioned rotor mechanisms, wherein the rotor mechanism is sleeved outside the stator mechanism.

[0016] A technical effect of an embodiment of the present application is that the bending body is bent relative to the housing, so that the bending body generates an abutment force on the rotor core along the axial direction of the rotor mechanism, thereby well positioning the rotor core in the axial direction and preventing the rotor core from being displaced along the axial direction of the rotor mechanism. This, on the one hand, forms a good fixed relationship between the rotor core and the housing, preventing the rotor core from being displaced relative to the housing and becoming loose, effectively preventing abnormalities or failures of the rotor mechanism, and thus improving the reliability of the rotor mechanism. On the other hand, it also simplifies the structure of the shell assembly and reduces the difficulty of assembling the rotor mechanism, thereby reducing the manufacturing cost of the entire rotor mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a three-dimensional structure of a rotor mechanism provided by an embodiment cooperating with an inner support fixture and an outer support fixture.

[0018] Figure 2 for Figure 1 Schematic diagram of the decomposition structure.

[0019] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the rotor mechanism shown.

[0020] Figure 4 for Figure 1 Schematic diagram of the three-dimensional cross-sectional structure of the shell assembly in the rotor mechanism shown.

[0021] Figure 5 for Figure 1 The diagram shows a three-dimensional cross-sectional structure of the rotor mechanism after removing the positioning sleeve.

[0022] Figure 6 for Figure 1 Schematic diagram of the three-dimensional cross-sectional structure of the rotor mechanism shown.

[0023] Figure 7 for Figure 1 Schematic diagram of the three-dimensional cross-sectional structure of the rotor core in the rotor mechanism shown.

[0024] Figure 8 for Figure 1 Schematic diagram of the three-dimensional cross-sectional structure of the positioning sleeve in the rotor mechanism shown.

[0025] Figure 9 A schematic three-dimensional cross-sectional view of a motor provided in one embodiment.

[0026] Figure markings: rotor mechanism 10, motor 20, stator mechanism 30, inner support clamp 41, outer support clamp 42, shell assembly 100, shell 110, first cavity 111, second cavity 112, step surface 113, bending body 120, limiting protrusion 130, supporting protrusion 140, rotor core 200, core body 210, mounting unit 220, mounting block 221, mounting part 2211, stop part 2212, mounting groove 222, limiting groove 230, isolation groove 240, magnet 300, positioning sleeve 400, cylinder 410, cover plate 420, first avoidance groove 421, second avoidance groove 422. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0033] See Figure 1 、 Figure 2 and Figure 3 In one embodiment of the present application, a rotor mechanism 10 includes a housing assembly 100 and a rotor core 200. The housing assembly 100 includes a shell 110 and a bending body 120. The shell 110 and the bending body 120 are connected to each other, and the bending body 120 can bend relative to the shell 110. The rotor core 200 is sleeved within the shell 110. When the bending body 120 and the shell 110 are bent at a certain angle, the bending body 120 can generate an abutting force against the rotor core 200 along the axial direction of the rotor mechanism 10. This can effectively position the rotor core 200 along the axial direction of the rotor mechanism 10 and prevent the rotor core 200 from displacing relative to the shell 110 along the axial direction of the rotor mechanism 10.

[0034] See Figure 4 、 Figure 5 and Figure 6In some embodiments, the housing 110 defines a receiving cavity, and the rotor core 200 is generally cylindrical and accommodated within the receiving cavity. There may be multiple bent bodies 120, each spaced apart along the circumference of the rotor mechanism 10. Before the rotor mechanism 10 is assembled, the housing 110 may have a generally circular cross-section. When a tool applies force toward the receiving cavity to a portion of the housing 110, the portion bends toward the receiving cavity relative to the rest of the housing 110. When the bent portion is able to exert a contact force against the rotor core 200 within the receiving cavity, the bent portion forms the bent body 120. While the rest of the housing 110 extends axially, the bent body 120 extends at an angle to the axial direction of the housing 110. It is understood that, before the bent body 120 is formed, the ends of the inner wall of the housing 110 may not be chamfered, so that sufficient material is subsequently available in the housing 110 to form the bent body 120.

[0035] See Figure 4 、 Figure 5 and Figure 6 In some embodiments, the housing assembly 100 further includes a limiting protrusion 130. The limiting protrusion 130 can extend a certain length along the axial direction of the rotor mechanism 10. The limiting protrusion 130 can be provided on the inner circumferential surface of the housing 110 and protrude radially from the rotor mechanism 10. The rotor core 200 defines a limiting groove 230. The limiting groove 230 can be formed by recessing the outer circumferential surface of the rotor core 200 to a predetermined depth. The limiting protrusion 130 cooperates with the limiting groove 230. This allows the limiting protrusion 130 to effectively limit the rotor core 200 in the radial and circumferential directions of the rotor mechanism 10, preventing the rotor core 200 from displacing relative to the housing 110 in the radial and circumferential directions of the rotor mechanism 10. The width of the limiting protrusion 130 can gradually decrease along the protruding direction of the limiting protrusion 130, resulting in a substantially trapezoidal cross-section of the limiting protrusion 130. The width of the limiting groove 230 can gradually decrease along the concave direction of the limiting groove 230, so that the cross-section of the limiting groove 230 is also approximately trapezoidal. This can reduce the amount of stagnation generated during the mating process between the limiting protrusion 130 and the limiting groove 230, thereby improving the mating efficiency and precision of the limiting protrusion 130 and the limiting groove 230. In other embodiments, the limiting protrusion 130 can be provided on the rotor core 200, while the limiting groove 230 is provided on the housing 110.

[0036] See Figure 4 、 Figure 5 and Figure 6In some embodiments, the shell assembly 100 further includes a support protrusion 140, which is protruded from the inner circumferential surface of the shell 110 along the radial direction of the rotor mechanism 10. For example, the support protrusion 140 can be directly protruded on the limiting protrusion 130, or the support protrusion 140 and the limiting protrusion 130 can maintain a certain distance in the circumferential direction. When the rotor core 200 is housed in the housing 110, the end of the rotor core 200 away from the bent body 120 abuts against the support protrusion 140, and the support protrusion 140 can generate a supporting force on the rotor core 200 along the axial direction of the rotor mechanism 10. Since the bent body 120 can generate an abutting force on the end of the rotor core 200 close to the bent body 120, the rotor core 200 is abutted between the support protrusion 140 and the bent body 120 along the axial direction of the rotor mechanism 10, thereby effectively realizing the axial positioning of the rotor core 200 in the rotor mechanism 10 and avoiding the rotor core 200 from being displaced along the axial direction of the rotor mechanism 10.

[0037] Therefore, the combined action of the bent body 120 and the support protrusion 140 allows the rotor core 200 to be positioned axially relative to the rotor mechanism 10. The limiting protrusion 130 cooperates with the limiting groove 230 to position the rotor core 200 circumferentially and radially relative to the rotor mechanism 10. Since the rotor core 200 is well positioned along the circumferential, axial, and radial directions of the rotor mechanism 10, displacement of the rotor core 200 along the circumferential, axial, and radial directions of the rotor mechanism 10 is effectively prevented, ultimately achieving effective fixation of the rotor core 200 relative to the housing 110.

[0038] If the rotor core 200 is fixedly connected to the housing 110 by adhesive bonding, the adhesive layer between the rotor core 200 and the housing 110 may age, loosen, or fall off due to the influence of temperature and humidity, as well as the erosion of dust, thereby affecting the connection strength between the rotor core 200 and the housing 110. This may cause the rotor core 200 and the housing 110 to loosen, resulting in malfunction or failure of the rotor mechanism 10, and thus affecting the reliability of the rotor mechanism 10 and the motor 20. If the rotor core 200 is connected to the housing 110 by injection molding or an interference fit through shrink-fit, this will increase the structural design difficulty of the rotor core 200 and the housing 110, and also increase the difficulty of assembly between the rotor core 200 and the housing 110, thereby increasing the manufacturing cost of the rotor structure.

[0039] In the rotor mechanism 10 of the above-described embodiment, the bending body 120 bends relative to the housing 110, generating an abutting force on the rotor core 200 along the axial direction of the rotor mechanism 10. This effectively positions the rotor core 200 axially and prevents the rotor core 200 from shifting along the axial direction of the rotor mechanism 10. This, on the one hand, secures the rotor core 200 relative to the housing 110, preventing the rotor core 200 from shifting relative to the housing 110 and becoming loose, effectively preventing abnormalities or failures of the rotor mechanism 10 and thereby improving the operational reliability of the rotor mechanism 10 and the motor 20. On the other hand, this also simplifies the structure of the housing assembly 100 and reduces the difficulty of assembling the rotor mechanism 10, thereby reducing the manufacturing cost of the entire rotor mechanism 10.

[0040] See Figure 5 、 Figure 6 and Figure 7 In some embodiments, the rotor mechanism 10 further includes magnets 300. Mounting slots 222 are defined in the rotor core 200. A plurality of magnets 300 are provided, and the number of magnets 300 and mounting slots 222 are equal, such that there is a one-to-one correspondence between the magnets 300 and mounting slots 222. The mounting slots 222 are spaced apart circumferentially along the rotor core 200. The magnets 300 engage with the mounting slots 222 and abut against the housing 110 along the axial direction of the rotor mechanism 10. This allows the housing 110 to effectively position the magnets 300 along the axial direction of the rotor mechanism 10.

[0041] See Figure 5 、 Figure 6 and Figure 7The rotor core 200 includes a core body 210 and a mounting unit 220. The core body 210 is generally cylindrical and sleeved within the housing 110. A retaining groove 230 is defined in the core body 210, and the core body 210 abuts against the support protrusion 140. The mounting unit 220 protrudes radially from the rotor mechanism 10 and is disposed on the inner wall of the core body 210. The mounting unit 220 includes two mounting blocks 221, which are spaced apart circumferentially along the core body 210. A gap exists between the two mounting blocks 221 along the circumference of the core body 210. This gap can be understood as a mounting slot 222 formed by the two mounting blocks 221. The mounting block 221 includes a mounting portion 2211 and a stop portion 2212. The mounting portion 2211 protrudes from the core body 210. The stop portion 2212 is connected to the end of the mounting portion 2211 away from the core body 210 at an angle, such that the stop portion 2212 bends relative to the mounting portion 2211 toward the mounting slot 222. For example, the stop portion 2212 and the mounting portion 2211 may be perpendicular to each other. When the magnet 300 is engaged with the mounting slot 222, the magnet 300 abuts against the two mounting portions 2211 along the circumference of the rotor mechanism 10. In other words, the magnet 300 is sandwiched between the two mounting portions 2211 along the circumference of the rotor mechanism 10. Therefore, the two mounting portions 2211 effectively position the magnet 300 along the circumference of the rotor mechanism 10, preventing the magnet 300 from circumferentially shifting along the rotor mechanism 10. At the same time, the stopper 2212 abuts against the magnet 300 along the radial direction of the rotor mechanism 10. Obviously, the core body 210 also abuts against the magnet 300 along the radial direction of the rotor mechanism 10. That is, the magnet 300 is sandwiched between the core body 210 and the stopper 2212 along the radial direction of the rotor mechanism 10. Therefore, the core body 210 and the stopper 2212 play a good positioning role for the magnet 300 along the radial direction of the rotor mechanism 10, thereby preventing the magnet 300 from being displaced along the radial direction of the rotor mechanism 10.

[0042] See Figure 5 、 Figure 6 and Figure 7In some embodiments, two adjacent mounting units 220 arranged circumferentially along the rotor mechanism 10 are spaced apart such that a separation slot 240 exists between the two mounting units 220. During assembly of the rotor mechanism 10, an outer support fixture 42 and an inner support fixture 41 are required. The outer support fixture 42 is mounted outside the shell assembly 100, while the inner support fixture 41 is mounted inside the rotor core 200. This allows the outer support fixture 42 and the inner support fixture 41 to provide strong support from both the inside and outside of the rotor mechanism 10, preventing deformation of the shell assembly 100 and the rotor core 200 during bending of the bending body 120 relative to the housing 110, thereby improving the assembly accuracy of the rotor mechanism 10. The provision of the separation slot 240 effectively prevents the formation of a lateral magnetic circuit between adjacent magnets 300 and allows the separation slot 240 to cooperate with the inner support fixture 41, thereby effectively positioning the inner support fixture 41.

[0043] See Figure 5 、 Figure 6 and Figure 8 In some embodiments, the rotor mechanism 10 further includes a positioning sleeve 400, which is disposed on the rotor core 200 and abuts the rotor core 200 and the magnetic steel 300 along the axial direction of the rotor mechanism 10. The bent body 120 can abut the positioning sleeve 400 along the axial direction of the rotor mechanism 10. That is, the positioning sleeve 400 directly abuts the rotor core 200 and the magnetic steel 300, and the bent body 120 directly abuts the positioning sleeve 400, so that the bent body 120 indirectly applies abutting force to the core and the magnetic steel 300 through the positioning sleeve 400. In other embodiments, to further save manufacturing costs, the positioning sleeve 400 can be omitted, so that the bent body 120 directly contacts the rotor core 200 and applies abutting force to the rotor core 200.

[0044] See Figure 4 、 Figure 5 and Figure 6The housing 110 is formed into a coaxially arranged first cavity 111 and a second cavity 112. The first cavity 111 and the second cavity 112 form the housing 110's accommodating chamber. The first cavity 111 has a larger diameter than the second cavity 112. The bottom wall of the first cavity 111 includes a stepped surface 113, which surrounds the second cavity 112. A portion of the rotor core 200 is accommodated within the second cavity 112, while the other portion of the rotor core 200 is accommodated within the first cavity 111. The positioning sleeve 400 includes a cylinder 410 and a cover plate 420. The cylinder 410 protrudes along the axial direction of the rotor mechanism 10 and is arranged at the edge of the cover plate 420. The cover plate 420 can be roughly annular, and the cylinder 410 can be roughly cylindrical. The cylinder 410 is housed within the first cavity 111 and is sleeved over the core body 210 of the rotor core 200. Obviously, the housing 110 is sleeved over the cylinder 410. The end of the cylindrical body 410 abuts the stepped surface 113, so that the stepped surface 113 effectively positions the positioning sleeve 400 along the axial direction of the rotor mechanism 10. The bent body 120 abuts the cover plate 420, so that the entire positioning sleeve 400 is abutted between the stepped surface 113 and the bent body 120 along the axial direction of the rotor mechanism 10. This effectively positions the positioning sleeve 400 in the axial direction of the rotor mechanism 10 and prevents the positioning sleeve 400 from axially displacing the rotor mechanism 10. The cover plate 420 can cover the core body 210 and the magnetic steel 300, so that the cover plate 420 abuts the rotor core 200 and the magnetic steel 300 along the axial direction of the rotor mechanism 10. When the positioning sleeve 400 abuts the cover plate 420, the bent body 120 exerts a contact force on the rotor core 200 and the magnetic steel 300 along the axial direction of the rotor mechanism 10 through the cover plate 420.

[0045] See Figure 4 、 Figure 5 and Figure 6 In some embodiments, a first avoidance groove 421 is provided on the side of the cover plate 420 away from the cylinder 410. The provision of the first avoidance groove 421 can provide a good avoidance space for the inner support fixture 41, thereby facilitating the installation of the inner support fixture 41. A second avoidance groove 422 is provided on the side of the cover plate 420 close to the cylinder 410, and the bent body 120 is accommodated in the second avoidance groove 422. The provision of the second avoidance groove 422 allows the bent body 120 to bend at a reasonable angle relative to the housing 110, thereby enabling the bent body 120 to generate sufficient abutment force on the entire positioning sleeve 400.

[0046] During the assembly process of the rotor mechanism 10, the rotor core 200 is first installed into the housing 110, followed by the magnet 300 installed into the mounting groove 222 of the rotor core 200, and then the positioning sleeve 400 is installed. The inner support fixture 41 and the outer support fixture 42 are then installed. At this point, the bent body 120 can be bent relative to the housing 110 and abutted against the positioning sleeve 400, thus completing the assembly of the rotor mechanism 10. Obviously, after the rotor mechanism 10 is assembled, the inner support fixture 41 and the outer support fixture 42 can be removed.

[0047] See Figure 9 The present application also provides a motor 20, which includes a stator mechanism 30 and the aforementioned rotor mechanism 10. The rotor mechanism 10 is sleeved outside the stator mechanism 30, so the motor 20 can be understood as an outer rotor motor 20.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A rotor mechanism, characterized in that: include: A shell assembly, comprising a shell and a bending body connected to each other, wherein the bending body can be bent relative to the shell; and The rotor core is sleeved in the shell, and the bent body bent at a certain angle relative to the shell can generate abutting force on the rotor core along the axial direction of the rotor mechanism.

2. The rotor mechanism according to claim 1, characterized in that: The shell assembly further includes a limiting protrusion, which is protrudingly provided on the inner circumferential surface of the shell, and a limiting groove is formed on the outer circumferential surface of the rotor core, and the limiting protrusion cooperates with the limiting groove.

3. The rotor mechanism according to claim 2, characterized in that: The shell assembly also includes a support protrusion, which is protruded relative to the inner circumferential surface of the shell. The rotor core abuts between the support protrusion and the bending body along the axial direction of the rotor mechanism, and the support protrusion is protruded on the limiting protrusion.

4. The rotor mechanism according to claim 1, wherein: It also includes magnetic steel. A mounting groove is opened on the rotor core. The magnetic steel cooperates with the mounting groove and abuts against the shell along the axial direction of the rotor mechanism.

5. The rotor mechanism according to claim 4, characterized in that: The rotor core includes a core body and a mounting unit, the mounting unit includes two mounting blocks spaced apart along the circumferential direction of the core body, the two mounting blocks form the mounting groove, the mounting block includes a mounting portion and a stop portion, the mounting portion is protrudingly provided on the core body, the stop portion is connected to an end of the mounting portion away from the core body at an angle, the mounting portion abuts against the magnetic steel along the circumferential direction of the rotor mechanism, and the stop portion abuts against the magnetic steel along the radial direction of the rotor mechanism.

6. The rotor mechanism according to claim 5, characterized in that: An isolation groove exists between two of the mounting units adjacent to each other along the circumference of the rotor mechanism.

7. The rotor mechanism according to claim 4, characterized in that: It also includes a positioning sleeve, which is arranged on the rotor core and abuts against the rotor core and the magnetic steel along the axial direction of the rotor mechanism. The bent body can abut against the positioning sleeve along the axial direction of the rotor mechanism.

8. The rotor mechanism according to claim 7, characterized in that: The shell is surrounded by a first cavity and a second cavity which are coaxially arranged. The bottom wall of the first cavity includes a step surface which is arranged around the second cavity, and the rotor core is partially accommodated in the second cavity. The positioning sleeve includes a cylinder and a cover plate. The cylinder is sleeved outside the rotor core and accommodated in the first cavity, and the cylinder abuts against the step surface. The cover plate abuts against the rotor core and the magnet along the axial direction of the rotor mechanism.

9. The rotor mechanism according to claim 8, characterized in that: A first avoidance groove is formed on a side of the cover plate away from the cylinder, and a second avoidance groove is formed on a side of the cover plate close to the cylinder. The bending body is accommodated in the second avoidance groove.

10. A motor, characterized in that: It comprises a stator mechanism and the rotor mechanism according to any one of claims 1 to 9, wherein the rotor mechanism is sleeved outside the stator mechanism.

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