Rotor shaft, rotor and motor
By designing a split rotor shaft and using a gradually inclined inclined structure, the problem of difficult rotor assembly is solved, efficient assembly and cost reduction are achieved, and carbon emissions are reduced.
Patent Information
- Application Number
- CN202421778885.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the prior art, the assembly of the rotor is difficult, especially in the interference fit of the rotor shaft and the iron core, there are problems of insertion difficulties and high costs.
A split rotor shaft is designed to form a head with a small cross-sectional area and a large cross-sectional area by designing a slope gradually inclined from the head to the tail on each block, thereby achieving easy insertion and subsequent pressing of blocks.
It effectively improves the assembly efficiency of the rotor shaft and iron core, reduces assembly difficulty and assembly cost, and reduces carbon emissions.
Smart Images
Figure CN222827089U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a rotor shaft, a rotor and a motor. Background Art
[0002] Electric motor (English: electric machine), also known as electric machinery, is a general term for devices that convert mechanical energy into electrical energy. It refers to a device that relies on electromagnetic induction and has parts that can move relative to each other. It can convert electrical energy into mechanical energy or mechanical energy into electrical energy.
[0003] Generally, the motor includes a rotor and a stator, wherein the rotor includes a rotor shaft and a rotor core, and the two are installed by interference fit. The rotor shaft is designed as an integrated structure. During assembly, the rotor core is first heated in advance, and then the rotor shaft is pressed into the inner hole of the core to the target position. After the rotor core is cooled, the rotor shaft and the core form a tight interference fit.
[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content
[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a rotor shaft, a rotor and a motor, which overcome the technical problem of difficulty in assembling the rotor in the related art.
[0006] The present disclosure provides a rotor shaft, comprising:
[0007] The first block and the second block both have an outer peripheral surface and an inclined surface located between the head and the tail, the outer peripheral surface is truncated at the inclined surface along the outer peripheral direction, and the inclined surface is arranged to be inclined from the head to the tail so as to realize that the cross-sectional area of the block gradually increases from the head to the tail;
[0008] The first block and the second block are configured to form the rotor shaft through the mutually matching inclined surfaces abutting each other, wherein the head and tail portions belonging to different blocks form the ends of the rotor shaft.
[0009] Optionally, in the first block and the second block, the inclined surface of each block extends from the head portion to the tail portion and is truncated at the tail portion, and the extending direction forms an angle with the central axis of the rotor shaft.
[0010] Optionally, the inclined surface includes a first inclined surface connected to the head and a second inclined surface connected to the tail, the first inclined surface and the second inclined surface are connected by a bent connecting surface, and the first inclined surface and the second inclined surface are both arranged to be inclined from the head to the tail.
[0011] Optionally, the first block and the second block both have a through-slot structure connecting the head and the tail, and the inclined surface is connected to the inner wall of the through-slot structure;
[0012] The first block and the second block are also configured to form a hollow structure of the rotor shaft through their respective through-slot structures when the rotor shaft is formed by abutting the mutually matching inclined surfaces.
[0013] The present disclosure also provides a rotor, comprising:
[0014] A rotor shaft according to any of the above embodiments;
[0015] An iron core sleeved outside the rotor shaft and having an interference fit with the rotor shaft;
[0016] Bearing mounting parts are mounted on both ends of the rotor shaft.
[0017] Optionally, the bearing mounting portion is welded to the rotor shaft.
[0018] The embodiment of the present disclosure also provides a motor, which includes the rotor of the above embodiment.
[0019] The rotor shaft, rotor and motor of the utility model have the following advantages:
[0020] By designing the rotor shaft as a split structure, each block is designed with an inclined surface that gradually tilts from the head to the tail to achieve a block with a small cross-sectional area at the head and a large cross-sectional area at the tail. In this way, the head allows the two blocks to be easily inserted into the core from both sides of the core at the same time, and only the press is needed in the second half to press the blocks from both sides until they reach the preset position. Compared with the related art, the two blocks encounter little resistance from the wall of the inner hole of the core during the insertion of the two blocks into the inner hole of the core. Even during the press-fitting in the second half, the resistance from the wall of the inner hole of the core gradually increases, and the press-fitting advancement distance is very small, so there is no need to heat the core in advance, which effectively improves the assembly efficiency of the rotor shaft and the core, and reduces the difficulty of assembly and the cost of assembly tooling. In addition, no heating is required, which reduces carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.
[0022] Figure 1 A cross-sectional view of a rotor shaft provided by an embodiment of the present disclosure is shown, wherein the cross section passes through the center axis of the rotor shaft;
[0023] Figure 2 An exploded view showing a rotor shaft provided by an embodiment of the present disclosure;
[0024] Figure 3 and Figure 4 A schematic cross-sectional view showing a rotor shaft provided by an embodiment of the present disclosure during assembly;
[0025] Figure 5 A front view of a segment of a rotor shaft according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION
[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
[0027] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.
[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0029] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0031] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.
[0032] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components present.
[0033] In addition, the accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.
[0034] refer to Figure 1 and Figure 2 , the rotor 10 comprises:
[0035] Rotor shaft 11;
[0036] The iron core 12 is sleeved outside the rotor shaft 11;
[0037] Bearing mounting parts 13 are mounted on both ends of the rotor shaft 11 .
[0038] like Figure 2 As shown, the rotor shaft 11 includes a first block 111 and a second block 112, both of which have an outer peripheral surface 1c and an inclined surface 1d located between the head portion 1a and the tail portion 1b, the outer peripheral surface 1c is truncated at the inclined surface 1d along the peripheral direction CC', and the inclined surface 1d is arranged to be inclined from the head portion 1a to the tail portion 1b to achieve a gradual increase in the cross-sectional area of the block from the head portion 1a to the tail portion 1b.
[0039] Thus, the first block 111 and the second block 112 both have a head portion 1a with a relatively small cross-sectional area. Figure 3 As shown, the heads 1a of the first block 111 and the second block 112 are inserted into the inner hole of the iron core 12 from both sides along the axial direction of the iron core 12 in a staggered manner, and the inclined surfaces 1d of the two blocks are radially opposite. Since the cross-sectional areas of the heads 1a of the two blocks are small, the heads 1a of the first block 111 and the second block 112 can be easily inserted into the iron core 12. Next, the first block 111 and the second block 112 are operated to push into the inner hole of the iron core 12 from both sides, so that the head 1a of each block in the first block 111 and the second block 112 gradually approaches the tail 1b of the other block, and the inner hole of the iron core 12 begins to form a certain resistance to the insertion of the two blocks.
[0040] Afterwards, if Figure 4 As shown, the two blocks are pressed from both sides to the predetermined position by a press machine, so that at the left position, the head 1a1 of the first block 111 and the tail 1b2 of the second block 112 are kept end-to-end aligned to form one end face of the rotor shaft 11. At the right position, the tail 1b1 of the first block 111 and the head 1a2 of the second block 112 are kept cross-sectionally aligned to form the other end face of the rotor shaft 11.
[0041] Thus, in the preset position, the first block 111 and the second block 112 are configured to form the rotor shaft 11 by abutting the mutually matched inclined surfaces (e.g., the upper inclined surface 1d1 and the lower inclined surface 1d2), wherein the head portions 1a1, 1a2 and the tail portions 1b1, 1b2 belonging to different blocks form the ends of the rotor shaft 11, and due to the difference in cross-sectional areas, they are mutually limited in the axial direction. At the same time, the rotor shaft 11 and the iron core 12 maintain an interference fit.
[0042] In this embodiment, the rotor shaft 11 is designed as a split structure, and each block is designed with an inclined surface 1d that gradually tilts from the head to the tail so that the block has a small head and a large tail. The small head allows the two blocks to be easily and synchronously inserted into the core 12 from both sides of the core 12, and only a press is needed to be used from both sides in the second half. Compared with the related art, the two blocks encounter little resistance from the inner hole wall of the core 12 during the insertion of the inner hole of the core 12. Even during the press-fitting in the second half, the resistance from the inner hole wall of the core 12 gradually increases, and the press-fitting advancement distance is very small, so there is no need to heat the core in advance, which effectively improves the assembly efficiency of the rotor shaft 11 and the core 12, and reduces the difficulty of assembly and the cost of assembly tooling. Moreover, no heating is required, which reduces carbon emissions.
[0043] Moreover, if Figure 3 As shown, the rotor shaft 11 adopts a block structure, and it is no longer necessary to use pipes to prepare parts, so the utilization rate of raw materials is higher and the cost is reduced.
[0044] For example Figure 2 As shown, the rotor shaft 11 of this embodiment is used. After being assembled with the iron core 12, bearing mounting parts 13 are respectively installed at both ends of the rotor shaft 11, and the bearing mounting parts 13 and the rotor shaft 11 are welded or bolted to achieve fixed installation.
[0045] In this way, when applied to a motor, bearings are respectively installed on the bearing installation parts 13 on both sides for rotation support.
[0046] In one embodiment, Figure 2 As shown, the first block 111 and the second block 112 both have a through-slot structure 113 connecting the head 1a and the tail 1b, and the inclined surface 1d is formed on both sides of the opening at the top of the through-slot structure 113. Figure 2 and Figure 4 As shown, the first block 111 and the second block 112 are further configured to form a hollow structure of the rotor shaft 11 through their respective through-groove structures 113 when the rotor shaft 11 is formed by abutting the mutually matching inclined surfaces 1d.
[0047] Using this structure, compared with the one-piece rotor shaft provided by the related art that is made by extrusion molding, such as Figure 3 As shown, the first sub-block 111 and the second sub-block 112 can be formed by stamping with a mold, which makes the mold simpler, reduces the cost, reduces the wear of the mold during the production process, and prolongs the service life.
[0048] In the embodiments of the present disclosure, Figure 4 As shown, in the first block 111 and the second block 112 , the inclined surface 1d of each block extends from the head portion 1a to the tail portion 1b and is truncated at the tail portion 1b , and its extending direction AA′ forms a certain angle α with the central axis L of the rotor shaft 11 .
[0049] In the embodiment of the present disclosure, the inclined surface 1d extends obliquely along the extension direction AA' as a whole, and the two ends of the inclined surface 1d along the extension direction AA' are respectively truncated at the end surface of the head 1a and the end surface of the tail 1b, thereby forming a cross-sectional area change of the corresponding block from the head 1a to the tail 1b. This is conducive to mold stamping. When a through groove structure 113 is formed in each block, the inclined surface 1d is equivalent to the edge surface of the through groove structure 113.
[0050] In an alternative approach, Figure 5 As shown, the inclined surface 1d' includes a first inclined surface 1da and a second inclined surface 1db arranged along the extension direction AA'. The first inclined surface 1da and the second inclined surface 1db both extend obliquely along the extension direction AA', and the first inclined surface 1da and the second inclined surface 1db are connected by a connecting surface 1dc, and the connecting surface 1dc is inward-turned compared to the first inclined surface 1da and outward-turned compared to the second inclined surface 1db.
[0051] In this embodiment, the first inclined surface 1da and the second inclined surface 1db both extend obliquely along the extension direction AA', and the connecting surface 1dc is designed to be inward-turned compared to the first inclined surface 1da and outward-turned compared to the second inclined surface 1db, so that the inclined surface 1d' is overall inclined from the head 1a' to the tail 1b' along the extension direction AA' to achieve a gradual increase in the cross-sectional area of the block from the head 1a' to the tail 1b'.
[0052] With this design, the first inclined surface 1da, the second inclined surface 1db and the connecting surface 1dc form a step structure, which can achieve axial limitation of the two blocks when assembled into a rotor shaft.
[0053] In this embodiment, a one-step structure is used. In another optional embodiment, at least two-step structures may be used, each step structure referring to Figure 5 shown.
[0054] An embodiment of the present disclosure further provides a motor, which includes the rotor shaft of the above embodiment.
[0055] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A rotor shaft, characterized in that: include: The first block and the second block both have an outer peripheral surface and an inclined surface located between the head and the tail, the outer peripheral surface is truncated at the inclined surface along the outer peripheral direction, and the inclined surface is arranged to be inclined from the head to the tail so as to realize that the cross-sectional area of the block gradually increases from the head to the tail; The first block and the second block are configured to form the rotor shaft through the mutually matching inclined surfaces abutting each other, wherein the head and tail portions belonging to different blocks form the ends of the rotor shaft.
2. The rotor shaft according to claim 1, characterized in that In the first block and the second block, the inclined surface of each block extends from the head portion to the tail portion and is truncated at the tail portion, and the extending direction forms an angle with the central axis of the rotor shaft.
3. The rotor shaft according to claim 1, characterized in that The inclined surface includes a first inclined surface connected to the head and a second inclined surface connected to the tail, the first inclined surface and the second inclined surface are connected via a bent connecting surface, and both the first inclined surface and the second inclined surface are arranged to be inclined from the head to the tail.
4. The rotor shaft according to claim 1, characterized in that The first block and the second block both have a through slot structure connecting the head and the tail, and the inclined surface is formed on both sides of the outward turning surface of the top opening of the through slot structure; The first block and the second block are also configured to form a hollow structure of the rotor shaft through their respective through-slot structures when the rotor shaft is formed by abutting the mutually matching inclined surfaces.
5. A rotor, characterized in that: include: The rotor shaft according to any one of claims 1 to 4; An iron core sleeved outside the rotor shaft and having an interference fit with the rotor shaft; Bearing mounting parts are mounted on both ends of the rotor shaft.
6. The rotor according to claim 5, characterized in that The bearing mounting portion is welded to the rotor shaft.
7. A motor, characterized in that: Comprising the rotor described in claim 5 or 6.