Rotor assembly and motor

Abstract

The utility model provides a rotor assembly and a motor, the rotor assembly comprises a rotating shaft, the rotating shaft comprises a first shaft body and a second shaft body, the first shaft body comprises a connecting section and a main body section, the outer wall of the main body section is provided with a first pressing ring, and the second shaft body is provided with a mounting cavity and a second pressing ring. The mounting cavity extends in the axial direction of the rotor assembly, the second pressing ring is arranged on the outer wall of the second shaft body, and the connecting section extends into the mounting cavity and is used for connecting the first shaft body and the second shaft body, so that the machining and mounting difficulty of the rotating shaft is reduced, and the cost of the rotor assembly is reduced.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a rotor assembly and a motor. Background Art

[0002] The motor is an important component of new energy vehicles. The rotor assembly is the core structure in the motor, which may include a rotor core shaft and components such as a rotor iron core arranged on the rotor core shaft. The rotor core shafts in the prior art are all of integral structure. The axial fixation of the iron core magnet assembly is achieved by setting a rotor retaining ring on the rotor core shaft. The rotor retaining ring has an interference axial limit with the rotor core shaft, mainly relying on the interference holding force of the rotor retaining ring for limitation. Therefore, the processing technology of the rotor assembly is complex, the cost is high, and the installation difficulty is great. Utility Model Content

[0003] In view of this, this application provides a rotor assembly and a motor to facilitate solving the problems of high processing cost and great installation difficulty of the rotor assembly in the prior art.

[0004] This application provides a rotor assembly, and the rotor assembly includes a rotating shaft, and the rotating shaft includes:

[0005] A first shaft body, the first shaft body includes a connecting section and a main body section, and a first retaining ring is arranged on the outer wall of the main body section;

[0006] A second shaft body, the second shaft body has an installation cavity and a second retaining ring. The installation cavity extends along the axial direction of the rotor assembly. The second retaining ring is arranged on the outer wall of the second shaft body. The connecting section extends into the installation cavity for connecting the first shaft body and the second shaft body.

[0007] The split setting of the rotating shaft can enable the first shaft body and the second shaft body to adopt different materials. The second shaft body is the output end of the rotating shaft and has relatively high requirements for mechanical properties. Therefore, better heat treatment processes such as carbonitriding can be used for processing to ensure that it has good properties such as strength and wear resistance. The requirements for mechanical properties of the first shaft body are relatively low. Therefore, it can be made of ordinary materials and can meet the performance requirements through tempering treatment, and the processing cost is also low. Through the split setting of the rotating shaft, the differentiation of materials and processing technologies of the first shaft body and the second shaft body can be realized, reducing the processing difficulty and processing cost while meeting their working performance requirements.

[0008] The rotating shaft adopts a split design. The split setting of the rotating shaft can divide the rotating shaft into two parts with smaller lengths, thereby reducing the processing difficulty. And the first retaining ring and the second retaining ring are respectively integrally arranged on the first shaft body and the second shaft body, and there is no need to separately set a retaining ring for installation, which is convenient for fixing and installing the iron core magnet assembly. Therefore, the rotor assembly provided by the embodiments of this application can reduce the processing and installation difficulty of the rotating shaft and reduce the manufacturing cost.

[0009] In a possible implementation, a thread is provided on the outer wall of the connecting section, and a thread is provided on the inner wall of the installation cavity. The first shaft body and the second shaft body are connected by threads.

[0010] In a possible implementation, the end face of the first shaft body close to the second shaft body has a first limiting surface, and the end face of the second shaft body close to the second shaft body has a second limiting surface. The first limiting surface and the second limiting surface can abut against each other.

[0011] In a possible implementation, the second retaining ring is located at the end of the second shaft body. The second limiting surface is located on the end face of the second retaining ring. The second limiting surface has a stepped portion, and the stepped portion abuts against the main body section along the radial direction of the rotor assembly.

[0012] In a possible implementation, the first shaft body has a positioning groove, and the positioning groove extends along the axial direction of the rotor assembly.

[0013] In a possible implementation, the rotor assembly includes a core permanent magnet assembly. The core permanent magnet assembly has a mounting hole, and a positioning key is provided on the inner wall of the mounting hole. The positioning key and the positioning groove are snap-fitted.

[0014] In a possible implementation, the outer wall of the second shaft body has a boss, and the boss is symmetrically arranged along the radial direction of the rotor assembly.

[0015] In a possible implementation, the first shaft body has a first mounting section, and the second shaft body has a second mounting section. The first mounting section and the second mounting section are stepped, and the first mounting section and the second mounting section are used for mounting bearings.

[0016] In a possible implementation, a spline is provided at one end of the second shaft body away from the first shaft body.

[0017] The present application provides a motor, and the motor includes a rotor assembly, and the rotor assembly is the rotor assembly described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a rotor assembly provided by an embodiment of the present application;

[0020] Figure 2 Structural schematic diagram of a first shaft body provided by an embodiment of the present application;

[0021] Figure 3 Structural schematic diagram of a second shaft body provided by an embodiment of the present application;

[0022] Figure 4 Cross-sectional view of a rotor assembly provided by an embodiment of the present application;

[0023] Figure 5 Structural schematic diagram of an iron core magnetic steel assembly provided by an embodiment of the present application.

[0024] Explanation of reference numerals:

[0025] 1 - Rotating shaft;

[0026] 11 - First shaft body;

[0027] 111 - First pressure ring;

[0028] 112 - Connecting section;

[0029] 113 - Main body section;

[0030] 114 - First limiting surface;

[0031] 115 - Positioning groove;

[0032] 116 - First installation section;

[0033] 12 - Second shaft body;

[0034] 121 - Second pressure ring;

[0035] 122 - Installation cavity;

[0036] 123 - Second limiting surface;

[0037] 123a - Step portion;

[0038] 124 - Boss;

[0039] 125 - Second installation section;

[0040] 126 - Spline;

[0041] 2 - Iron core magnetic steel assembly;

[0042] 21 - Installation hole;

[0043] 22 - Positioning key;

[0044] 3 - Bearing. Detailed implementation manners

[0045] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0046] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0047] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0048] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0049] Such as Figures 1 to 4As shown in the figure, an embodiment of the present application provides a rotor assembly. The rotor assembly includes a rotating shaft 1, and the rotating shaft 1 includes a first shaft body 11 and a second shaft body 12. The first shaft body 11 includes a connecting section 112 and a main body section 113, and a first retaining ring 111 is arranged on the outer wall of the main body section 113. The second shaft body 12 has an installation cavity 122 and a second retaining ring 121. The installation cavity 122 extends along the axis direction of the rotor assembly, and the installation cavity 122 is located at the end face of the second shaft body 12 close to the first shaft body 11. The first retaining ring 111 and the second retaining ring 121 are in a form of protruding radially along the rotating shaft 1, and are used to achieve a limiting function in the axial direction of the rotating shaft 1. The connecting section 112 can extend into the installation cavity 122, so that the second shaft body 12 is sleeved outside the connecting section 112, and the first shaft body 11 and the second shaft body 12 are connected. The first shaft body 11 and the second shaft body 12 can be connected to each other by interference fit or fixedly connected by a connecting piece, as long as the first shaft body 11 and the second shaft body 12 can be connected by means of socket connection, and specific limitations are not made here. By arranging the installation cavity 122, a part of the first shaft body 11 can extend into the interior of the second shaft body 12, thereby improving the connection stability and coaxiality of the two, facilitating the improvement of the installation accuracy and reducing the installation and processing difficulty. Specifically, the cross-sectional diameter of the main body section 113 is larger than the cross-sectional diameter of the connecting section 112. During installation, the components that need to be socket-mounted outside the shaft body are first passed through the connecting section 112 and then installed on the main body section 113, and then the first shaft body 11 and the second shaft body 12 are connected. The dimension of the installation cavity 122 along the axis direction of the rotor assembly, that is, the depth of the installation cavity 122, should be equal to or greater than the length of the connecting end 112 in the axis direction of the rotor assembly, so that when the first shaft body 11 and the second shaft body 12 are connected and installed, the entire connecting section 112 can be located inside the installation cavity 122.

[0050] The main body section 113 is used to arrange components such as the installation of the iron core magnet assembly 2. After the iron core magnet assembly 2 is installed on the first shaft body 11, the first shaft body 11 and the second shaft body 12 are connected, so that the first retaining ring 111 cooperates with the second retaining ring 121 to axially limit the components installed on the main body section 113, and the first retaining ring 111 is located on the side of the main body section 113 away from the connecting section 112. For example, when installing the iron core magnet assembly 2, the components that need to be installed on the rotating shaft 1 can be first installed from one end of the connecting section 112 to the main body section 113, and then the second shaft body 12 is connected to the first shaft body 11. The first retaining ring 111 and the second retaining ring 121 are respectively located on both sides of the iron core magnet assembly 2 along the axial direction of the rotating shaft 1, thereby realizing axial limitation of the iron core magnet assembly 2.

[0051] In the prior art, the rotating shaft 1 is usually a steel part formed by forging. The rotating shaft has a relatively long dimension, and problems such as deformation and bending may occur during the heat treatment process in the machining process. The forging difficulty is high, and a separate retaining ring needs to be set. Setting the retaining ring requires heating for assembly, a large press needs to be used and pressure holding is required, resulting in a long processing time and high cost. The rotating shaft 1 provided in the embodiment of the present application adopts a split design. Splitting the rotating shaft 1 into two parts with smaller lengths can reduce the processing difficulty, and the first retaining ring 111 and the second retaining ring 121 are respectively integrally provided on the first shaft body 11 and the second shaft body 12, eliminating the need for a separate retaining ring for installation, thus facilitating the fixed installation of the iron core magnet assembly 2. Therefore, the rotor assembly provided in the embodiment of the present application can reduce the processing difficulty of the rotating shaft 1 and reduce the manufacturing cost.

[0052] The split setting of the rotating shaft 1 allows the first shaft body 11 and the second shaft body 12 to be made of different materials. The second shaft body 12 is the output end of the rotating shaft 1 and has relatively high requirements for mechanical properties. Therefore, better heat treatment processes such as carbonitriding can be used for machining to ensure its good strength, wear resistance and other properties. The first shaft body 11 has relatively low requirements for mechanical properties. Therefore, it can be made of ordinary materials and can meet the performance requirements through tempering treatment, and the processing cost is also relatively low. Through the split setting of the rotating shaft 1, the differentiation of the materials and processing processes of the first shaft body 11 and the second shaft body 12 can be realized, reducing the quality of the rotating shaft 1, reducing its processing difficulty while meeting its working performance requirements, reducing the processing cost, and having mechanical properties that meet the actual needs.

[0053] As Figure 2 and Figure 3 shown, in a possible implementation manner, the outer wall of the connecting section 112 is provided with threads, and the inner wall of the installation cavity 122 is provided with threads. The first shaft body 11 and the second shaft body 12 are connected by threads.

[0054] The first shaft body 11 and the second shaft body 12 are interlocked by threaded connection, which can reduce the installation difficulty. During installation, first install the iron core magnet assembly 2 on the main body section 113, one end of the iron core magnet assembly 2 abuts against the first retaining ring 111, then sleuth the second shaft body 12 outside the connecting section 112, and by rotating the second shaft body 12, connect the first shaft body 11 and the second shaft body 12, and make the second retaining ring 121 move towards the iron core magnet assembly 2 and abut against the other side of the iron core magnet assembly 2.

[0055] As Figure 2 and Figure 3 shown, in a possible implementation manner, the end face of the first shaft body 11 close to the second shaft body 12 has a first limiting surface 114, and the end face of the second shaft body 12 close to the first shaft body 12 has a second limiting surface 123. The first limiting surface 114 and the second limiting surface 123 can abut against each other.

[0056] The first limiting surface 114 and the second limiting surface 123 can improve the connection stability between the first shaft body 11 and the second shaft body 12 through mutual cooperation. When the first shaft body 11 and the second shaft body 12 are connected, the first limiting surface 114 and the second limiting surface 123 can come into contact with each other, thereby increasing the contact area between the first shaft body 11 and the second shaft body 12, facilitating the positioning and installation of the first shaft body 11 and the second shaft body 12, and improving the connection stability between the two. When the first shaft body 11 and the second shaft body 12 are connected by threads, the first limiting surface 114 and the second limiting surface 123 can reduce the possibility of loosening between the first shaft body 11 and the second shaft sleeve 12.

[0057] As Figure 3 shown, in a possible implementation manner, the second pressing ring 121 is located at the end of the second shaft body 12, the second limiting surface 123 is located on the end surface of the second pressing ring 121, and the second limiting surface 123 has a stepped portion 123a, and the stepped portion 123a abuts against the main body section 113 along the radial direction of the rotor assembly.

[0058] At least a part of the second limiting surface 123 is recessed along the axial direction of the rotor assembly to form the stepped portion 123a. When the first limiting surface 114 and the second limiting surface 123 abut against each other, the stepped portion 123a can be sleeved on the outer side of the main body section 113, thereby improving the connection stability between the first shaft body 11 and the second shaft body 12 and reducing the possibility of the first shaft body 11 shaking relative to the second shaft body 12. The inner wall of the stepped portion 123a can be set as a plane, or can be set as an inclined surface or a curved surface and other forms, and the shape of the edge of the main body section 113 is adapted to the stepped portion 123a.

[0059] As Figure 2 shown, in a possible implementation manner, the first shaft body 11 has a positioning groove 115, and the positioning groove 115 extends along the axial direction of the rotor assembly.

[0060] The positioning groove 115 is used to limit the components installed on the rotating shaft 1. For example, when installing the iron core permanent magnet assembly 2, the iron core permanent magnet assembly 2 is sleeved outside the rotating shaft 1. The iron core permanent magnet assembly 2 is correspondingly provided with a positioning key 22 protruding towards the rotating shaft 1. The positioning key 22 can extend into the positioning groove 115 to realize the limitation of the iron core permanent magnet assembly 2 and can transmit torque. The positioning groove 115 extends along the length direction of the rotor assembly to the edge of the main body section 113 close to the connecting section 112. When installing the iron core permanent magnet assembly 2, the positioning key 22 can enter the positioning groove 115 along the edge of the positioning groove 115, and the iron core permanent magnet assembly 2 can slide along the positioning groove 115 to the position where it abuts against the first retaining ring 111. The rotating shaft 1 of the present application is provided in a split type, and only the first shaft body 11 is provided with the positioning groove 115, thereby reducing the total length of the positioning groove 115. Since the processing accuracy requirement of the positioning groove 115 is high, the solution provided by the embodiment of the present application can reduce the processing cost of the rotor assembly. According to actual needs, the first shaft body 11 can be provided with a plurality of positioning grooves 115 for cooperating with the iron core permanent magnet assembly 2, so as to improve the stability of the cooperative installation of the rotating shaft 1 and the iron core permanent magnet assembly 2.

[0061] As Figure 5 shown, in a possible implementation manner, the rotor assembly includes an iron core permanent magnet assembly 2. The iron core permanent magnet assembly 2 has a mounting hole 21. The iron core permanent magnet assembly 2 is mounted on the first shaft body 11. The inner wall of the mounting hole 21 has a positioning key 22, and the positioning key 22 is clamped with the positioning groove 115.

[0062] The iron core permanent magnet assembly 2 includes an iron core and a permanent magnet. A receiving cavity is provided inside the iron core, and the permanent magnet is arranged inside the receiving cavity. The permanent magnet has magnetism. A plurality of receiving cavities can be provided inside the iron core, so as to arrange a plurality of permanent magnets at different positions of the iron core. The iron core has a mounting hole 21, and the rotating shaft 1 can pass through the mounting hole 21 to connect the iron core permanent magnet assembly 2 to the rotating shaft 1. Among them, the first retaining ring 111 and the second retaining ring 121 are respectively located on both sides of the iron core permanent magnet assembly 2 along the axial direction of the rotor assembly to realize the axial limitation of the iron core permanent magnet assembly 2. The cooperation of the positioning key 22 and the positioning groove 115 is used to realize the circumferential limitation of the iron core permanent magnet assembly 2, so that the iron core permanent magnet assembly 2 can rotate synchronously with the rotating shaft 1.

[0063] As Figure 3 shown, in a possible implementation manner, the outer wall of the second shaft body 12 has a boss 124, and the boss 124 is symmetrically arranged along the radial direction of the rotor assembly.

[0064] Among them, the boss 124 can be set to a quadrilateral or a hexagon. The outer wall of the boss 124 has at least one plane, which can provide a clamping position for the installation tool. For example, a wrench can be used to clamp the boss 124 to rotate the second shaft body 12 so that the first shaft body 11 and the second shaft body 12 are assembled and connected.

[0065] As Figure 2 shown, in a possible implementation, the first shaft body 11 has a first mounting section 115, and the second shaft body 12 has a second mounting section 125. The first mounting section 115 and the second mounting section 125 are used to mount the bearing 3. The first mounting section 115 and the second mounting section 125 are respectively stepped. The rotor assembly can respectively arrange the bearing 3 on the first mounting section 115 and the second mounting section 125 to support the rotating shaft 1 and enable the rotating shaft 1 to rotate normally. The stepped shape means that the diameters of at least part of the first mounting section 115 and the second mounting section 125 decrease along the radial direction of the rotating shaft 1. Since the diameters at different positions are different, a stepped shape is formed. The stepped shape can make the part with a suitable radial direction of the rotating shaft 1 adapt to the inner diameter of the bearing 3 so that the bearing 3 can be sleeved on the rotating shaft 1 for cooperation, and the stepped shape can provide a plane to abut against the bearing 3, thereby realizing the axial limit of the bearing 3. A stepped shaft section can be arranged at the end of the first shaft body 11 for mounting the resolver rotor, and the resolver rotor is used to measure the angular displacement and angular velocity when the rotating shaft rotates.

[0066] As Figure 3 shown, in a possible implementation, a spline 126 is provided at one end of the second shaft body 12 away from the first shaft body 11. The spline 126 is a mechanical connection device. The spline 126 of the second shaft body 12 is an external spline 126 that protrudes from the surface of the rotating shaft 1 along the radial direction of the rotating shaft 1. The second shaft body 12 is the output end of the rotor assembly and is used to output torque. The spline 126 is used to cooperate and connect with the internal spline 126 provided on other components, thereby realizing the output of torque. In the solution provided by the embodiments of the present application, the shaft body is arranged in a split manner. The second shaft body 12 provided with the spline 126, as the output end, has higher requirements for mechanical properties. Therefore, better heat treatment processes such as carbonitriding can be used for processing to ensure that it has good mechanical properties to meet actual needs. The requirements for mechanical properties of the first shaft body 11 are relatively low. Therefore, materials and processes with lower costs can be used. Therefore, the rotor assembly provided by the embodiments of the present application can reduce the processing difficulty and cost of the rotating shaft 1.

[0067] The present application provides a motor, which includes a rotor assembly. The rotor assembly is the rotor assembly described in any of the above embodiments. The motor has the technical effects of any of the above embodiments and will not be elaborated here.

[0068] The structure, features and effects of the present application have been described in detail based on the embodiments shown in the drawings. The above are only the preferred embodiments of the present application, but the present application is not limited to the implementation scope shown in the drawings. Any changes made according to the concept of the present application, or equivalent embodiments modified into equivalent changes, still within the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that, The rotor assembly includes a rotating shaft, and the rotating shaft includes: A first shaft body, the first shaft body includes a connecting section and a main body section, and a first retaining ring is provided on the outer wall of the main body section; A second shaft body, the second shaft body has an installation cavity and a second retaining ring, the installation cavity extends along the axial direction of the rotor assembly, the second retaining ring is provided on the outer wall of the second shaft body, and the connecting section extends into the installation cavity for connecting the first shaft body and the second shaft body.

2. The rotor assembly according to claim 1, wherein Threads are provided on the outer wall of the connecting section, and threads are provided on the inner wall of the installation cavity, and the first shaft body and the second shaft body are connected by threads.

3. The rotor assembly according to claim 1, wherein, A first limiting surface is provided on the end face of the first shaft body close to the second shaft body, and a second limiting surface is provided on the end face of the second shaft body close to the second shaft body, and the first limiting surface and the second limiting surface can abut against each other.

4. The rotor assembly according to claim 3, wherein The second retaining ring is located at the end of the second shaft body, the second limiting surface is located on the end face of the second retaining ring, and the second limiting surface has a stepped portion, and the stepped portion abuts against the main body section along the radial direction of the rotor assembly.

5. The rotor assembly according to claim 1, characterized in that The first shaft body has a positioning groove, and the positioning groove extends along the axial direction of the rotor assembly.

6. The rotor assembly according to claim 5, wherein The rotor assembly includes an iron core permanent magnet assembly, the iron core permanent magnet assembly has an installation hole, and a positioning key is provided on the inner wall of the installation hole, and the positioning key and the positioning groove are engaged.

7. The rotor assembly according to claim 1, wherein The outer wall of the second shaft body has a boss, and the bosses are symmetrically arranged along the radial direction of the rotor assembly.

8. The rotor assembly according to claim 1, wherein The first shaft body has a first installation section, and the second shaft body has a second installation section, and the first installation section and the second installation section are stepped, and the first installation section and the second installation section are used for installing bearings.

9. The rotor assembly according to claim 1, wherein A spline is provided at one end of the second shaft body away from the first shaft body.

10. A motor, characterized in that, The motor includes a rotor assembly, and the rotor assembly is the rotor assembly according to any one of claims 1 to 9.

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