CN116505696A - Motor end cover, motor and electric product - Google Patents

Abstract

The embodiment of the application provides a motor end cover, motor and electrical product, the motor end cover includes: a center portion; a plurality of extension portions, one end of which is provided on a radial outer peripheral surface of the center portion; and a deformable leg provided at the other end of at least one of the plurality of extensions and extending in the axial direction, the deformable leg being for interference fit with a stator core of the motor. Through this application embodiment, practice thrift processing cost and materials cost.

Description

Motor end cover, motor and electric product

Technical Field

The application relates to the field of electromechanics, in particular to a motor end cover, a motor and an electric product.

Background

Typically, an electric machine has end caps that are assembled by contact with other components of the machine (e.g., the stator).

It is currently common practice to first form the end cap and then rework the portion of the end cap that contacts other components (e.g., the seam allowance) to ensure accuracy of assembly of the end cap and other components. In this case, in order to ensure the processing accuracy of the end cap and prevent damage to the end cap caused by the processing, it is necessary to provide strength reinforcing members (such as connection ribs) on the end cap, which greatly increases the material consumption and increases the material cost. In addition, since reworking is required to ensure assembly accuracy, machining costs are increased.

It should be noted that the foregoing description of the background art is only for the purpose of facilitating a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background section of the present application.

Disclosure of Invention

In order to solve at least one of the above problems or similar problems, embodiments of the present application provide an end cover, a motor, and an electrical product, which can reduce the material consumption of the end cover, simplify the processing process, and reduce the cost while ensuring the product performance unchanged.

According to a first aspect of embodiments of the present application, there is provided a motor end cap comprising:

a center portion;

a plurality of extension portions, one end of which is provided on a radial outer peripheral surface of the center portion; and

and the deformable support leg is arranged at the other end of at least one extension part of the plurality of extension parts and is used for being in interference fit with a stator core of the motor.

In one or more embodiments, the extension includes:

the deformable support leg comprises a support leg main body extending along the axial direction and a matching part arranged at one end, far away from the extending part, of the support leg main body, wherein the matching part is used for being in clearance fit with the stator core.

In one or more embodiments, one end of the deformable leg is provided with a storage portion for storing flash generated during the assembly of the interference fit.

In one or more embodiments, the deformable leg includes a plurality of cutting portions located at a side away from the extension in the axial direction, the plurality of cutting portions being disposed at intervals in the circumferential direction.

In one or more embodiments, the cross section of the cutting portion, as viewed in the circumferential direction, is any one or a combination of the following: rectangular, trapezoidal, and triangular.

In one or more embodiments, the end surfaces of the plurality of the cutting portions at the ends remote from the extension portions are located on the same plane.

In one or more embodiments, a difference between a diameter of a circumscribed circle of the plurality of cutting portions and a radial dimension of any one of the cutting portions is smaller than an outer diameter of the stator core.

In one or more embodiments, the number of extensions is 3 or 4.

According to a second aspect of embodiments of the present application, there is provided an electric machine comprising:

a rotor having a rotation shaft rotating around a central axis;

a stator provided radially outward of the rotor, the stator including a stator core and a winding wound around the stator core; and

the motor end cover of the first aspect, wherein the deformable leg is in interference fit with the stator core.

According to a third aspect of embodiments of the present application, there is provided an electrical product having an electrical machine as described in the second aspect above.

One of the beneficial effects of the embodiment of the application is that: in the motor end cover of the application, through the stator core interference fit of flexible landing leg and motor, consequently, need not to be used for the reprocessing of the position of assembling with other parts of motor to the motor end cover, can practice thrift processing cost, in addition, also need not to set up the part (like the connecting rib) that is used for guaranteeing processing strength at the motor end cover, can practice thrift the materials of end cover, from this, practiced thrift processing cost and materials cost.

Specific embodiments of the present application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the present application may be employed. It should be understood that the embodiments of the present application are not limited in scope thereby. Many alterations, modifications, and equivalents may be made to the embodiments of the present application by those skilled in the art, which fall within the principles and spirit of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic illustration of an end cap according to an embodiment of the first aspect of the present application;

FIG. 2 is an enlarged schematic view of portion A of the end cap of FIG. 1;

FIG. 3 is another schematic view of a cutting portion of an embodiment of the first aspect of the present application;

FIG. 4 is another schematic view of an end cap of an embodiment of the first aspect of the present application;

FIG. 5 is an enlarged schematic view of portion B of the end cap shown in FIG. 4;

FIG. 6 is a schematic illustration of an electric machine according to an embodiment of the second aspect of the present application;

FIG. 7 is another schematic illustration of an electric machine according to an embodiment of the second aspect of the present application;

FIG. 8 is a schematic cross-sectional view of an electric motor according to an embodiment of the second aspect of the present application;

fig. 9 is an enlarged schematic view of a portion C of the motor shown in fig. 8.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, with reference to the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the present application which are indicative of some of the embodiments in which the principles of the present application may be employed, it being understood that the present application is not limited to the described embodiments, but, on the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the appended claims.

In the present application embodiments, the term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprises," "comprising," "including," "having," and the like, are intended to reference the presence of stated features, elements, components, or groups of components, but do not preclude the presence or addition of one or more other features, elements, components, or groups of components.

In the embodiments herein, the singular forms "a," an, "and" the "may include plural forms, and should be construed broadly as" one "or" one type "and not as limited to the meaning of" one; furthermore, the term "comprising" is to be interpreted as including both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "at least partially according to … …", and the term "based on" should be understood as "based at least partially on … …", unless the context clearly indicates otherwise.

In the following description of the present application, a direction extending along or parallel to the center axis OO 'of the end cover (or the center axis UU' of the motor, which will be described below) is referred to as an "axial direction" for convenience of description; the radial direction about the central axis OO 'is referred to as a "radial direction", the direction radially approaching the central axis OO' is referred to as a "radially inner side" or "inner side", the direction radially separating from the central axis OO 'is referred to as a "radially outer side" or "outer side", and the direction around the central axis OO' is referred to as a "circumferential direction". It should be noted that these are for convenience of illustration only and are not limiting of the end cap, motor use and orientation of manufacture.

The following describes the implementation of the examples of the present application with reference to the drawings.

Example of the first aspect

Embodiments of a first aspect of the present application provide a motor end cap.

Fig. 1 is a schematic view of an end cap of an electric machine in accordance with an embodiment of the first aspect of the present application.

As shown in fig. 1, the motor end cap 10 includes a central portion 11, a plurality of extension portions 12, and deformable legs 13. One end P of the extension 12 is provided on the radial outer peripheral surface 111 of the central portion 11, and the deformable leg 13 is provided on the other end Q of at least one extension 12 of the plurality of extensions 12, the deformable leg 13 being for interference fit with the stator core of the motor.

As is clear from the above-described embodiments, in the motor end cover 10, the deformable leg 13 is in interference fit with the stator core of the motor, so that there is no need to reprocess the parts of the motor end cover for assembling with other parts of the motor, and processing cost can be saved.

In one or more embodiments, the number of the extending portions 12 may be any number, as shown in fig. 1, and may be 4, but not limited to, 2, 3, or more than 4, etc., which is not limited in this application, and the plurality of extending portions 12 may be equally spaced along the circumferential direction, so that the stability of the motor end cover 10 may be improved, but not limited to, the plurality of extending portions 12 may be also be equally spaced along the circumferential direction or partially equally spaced.

In the present embodiment, for the plurality of extension portions 12, the deformable leg 13 may be provided at the other end Q of any one or more or all of the extension portions 12. For example, for the 4 extension portions 12 shown in fig. 1, the deformable legs 13 may be provided at the other ends Q of the 4 extension portions 12, but the present invention is not limited thereto, and the deformable legs 13 may be provided at the other ends Q of any 1 or 2 or 3 extension portions 12 out of the 4 extension portions 12, and in addition, for the case where the number of extension portions 12 provided in the motor end cover 10 is other, the manner of providing the deformable legs 13 is referred to the above description for providing the deformable legs 13 at the 4 extension portions. Thereby, the deformable leg can be flexibly provided.

In one or more embodiments, as shown in FIG. 1, the extension 12 may extend radially. One end P of the extension 12 is disposed on the radially outer peripheral surface 111 of the central portion 11 and extends toward the radially outer side, and it is noted that the extension 12 extending toward the radially outer side herein is understood to mean that the extension 12 extends toward the radially outer side in a direction perpendicular to the axial direction OO ', or that the extension 12 extends toward one side in the axial direction (e.g., the axial direction O side in fig. 1) while extending toward the outer side, that is, the extension 12 may extend in a direction at an angle to the plane perpendicular to the axial direction OO'.

In the embodiment of the present application, as shown in fig. 1, the deformable leg 13 is disposed at the Q end of the extension portion 12, and the deformable leg 13 may extend in the axial direction OO', and it should be noted that, here, the deformable leg 13 extends in the axial direction is understood as the deformable leg 13 extends in a direction completely parallel to the axial direction, or the deformable leg 13 extends in a direction substantially parallel to the axial direction. In the embodiment of the present application, the deformable leg 13 is used for interference fit with the stator core of the motor, that is, the deformable leg 13 includes a portion or structure for mounting the electronic core, and the portion or structure enables the stator core to be mounted on the motor end cover 13 by interference fit with the stator core.

In the embodiment of the present application, the specific position of the structure formed on the deformable leg 13 for interference fit with the stator core is not limited. For example, the structure may be formed at an axially intermediate position of the deformable leg 13, such as a radially inner intermediate position of the deformable leg 13, or an end of the deformable leg 13 axially away from the extension 12, such as a radially inner or radially central or radially outer position of the end, to which the present application is not limited.

In this embodiment, the specific shape of the structure formed on the deformable leg 13 for interference fit with the stator core is not limited, as long as the structure on the deformable leg 13 can be interference fit with the stator core, where interference fit means that the inner diameter of the hole formed by the structure is smaller than the outer diameter of the stator core, or the diameter of the radially inscribed circle of the structure is smaller than the outer diameter of the stator core, or a part of the radial direction of the structure overlaps with the stator core in the axial direction, and the structure can deform under the action of a predetermined force so that at least a part of the side surface (such as a part of the radial outer circumferential surface) of the stator core abuts against the deformed structure, thereby realizing interference fit between the deformable leg and the stator core, and the predetermined force is a force that can deform the structure. That is, the deformable leg includes a deformable portion as a structure for interference fit with the stator core of the motor, which is deformed by a force of a predetermined magnitude during assembly such that the deformed deformable portion abuts at least a portion of a side surface (e.g., a portion of a radial outer circumferential surface) of the stator core, thereby achieving interference fit between the deformable leg and the stator core, and the location and specific shape of the deformable portion are not limited, and exemplary embodiments will be described below.

The following exemplifies the structure of the deformable leg 13 for interference fit with the stator core.

Fig. 2 is an enlarged schematic view of portion a of the end cap of fig. 1.

In one or more embodiments, as shown in fig. 1 and 2, the deformable leg 13 includes a plurality of cutting portions 133 located on a side (O-side) away from the extension portion 12 in the axial direction, the plurality of cutting portions 133 being disposed at intervals in the circumferential direction. Thereby, a structure for interference fit with the stator core is formed.

In this embodiment, each of the 4 deformable legs 13 shown in fig. 1 may include a cutting portion 133, any deformable leg 13 may include one or more cutting portions 133, the plurality of cutting portions 133 included in the single deformable leg 13 are arranged at intervals in the circumferential direction, all cutting portions 133 of all deformable legs 13 are arranged in the circumferential direction, in other words, all cutting portions 133 are located on the same circle as viewed in the axial direction, for all deformable legs 13, and the cutting portions 133 and the stator core are interference fit. That is, the diameter of the inscribed circle corresponding to all the cutting portions 133 is smaller than the outer diameter of the stator core, when the motor end cover and the stator core are assembled, the stator core is axially inserted into the motor end cover, the axial end surface of the stator core first contacts the radially inner portion of the end surface on the axial O side of the cutting portion 133, then the stator core axially presses the cutting portion 133 to deform the cutting portion 133, and the stator core is axially displaced and/or deformed toward the O' side with respect to the portion of the end surface on the axial O side of the cutting portion 133, i.e., the radially outer portion of the end surface on the axial O side of the cutting portion 133, so that a portion of the radially outer circumferential surface of the stator core abuts the radially inner side of the deformed cutting portion 133, achieving interference fit assembly of the stator core and the motor end cover.

In the embodiment of the present application, the diameter of the circumscribed circle of the cutting portion 133 is larger than the diameter of the stator core, and thus, when the stator core is pre-supported by bringing the axial one-side end surface of the stator core into contact with the cutting portion 133, the radially outermost side of the stator core is located between the radially innermost side and the radially outermost side of the cutting portion 133, and it is possible to ensure that the axial end surface of the cutting portion 133 has a portion that does not contact with the stator core, and it is ensured that an interference fit between the stator core and the deformable leg can be achieved.

In the present embodiment, each of the deformable legs 13 may include the cutting portion 133, but the present application is not limited thereto, and for example, the cutting portion 133 may be formed at one or several of the deformable legs 13, for example, the cutting portion 133 may be formed at two deformable legs 13 symmetrical with respect to the center of the motor cover.

In the embodiment of the present application, as shown in fig. 1 and 2, the cutting portion 133 is located at a position radially outward of the deformable leg 13, but the present application is not limited thereto, and for example, the cutting portion 133 may be located at a position radially center of the O-end face of the deformable leg 133.

In one or more embodiments, the cross-section of the cutting portion 133, as viewed circumferentially, is any one or a combination of the following: rectangular, trapezoidal, and triangular.

For example, as shown in fig. 2, the cross section of the cutting portion 133 is rectangular when viewed in the circumferential direction. Thus, the axial O-side end surface of the cutting portion 133 has a large dimension in the radial direction, and the stator core can be reliably pre-supported when the stator core is placed on the axial O-side end surface of the cutting portion 133 for interference fit assembly.

However, the present application is not limited thereto, and the cross section of the cutting portion 133 may be other shapes, such as a trapezoid or a triangle, or any combination of a rectangle, a trapezoid, and a triangle, as viewed in the circumferential direction.

Fig. 3 shows another schematic view of a cutting portion of an embodiment of the present application. As shown in fig. 3, the cross section of the cutting portion 133-1 is triangular when viewed in the circumferential direction, and thus, when the stator core is pressed against the cutting portion 133-1 in the axial direction, the cutting portion 133-1 is easily deformed, and the interference fit between the stator core and the deformable leg can be easily achieved.

In addition, the cutting portion 132 may have other shapes, such as a sector shape, in which one of two straight line segments of the sector shape is provided on the radially inner peripheral surface of the mating portion 132, the other is provided on the axially O-side end surface of the leg main body 131, and the arc surface where the arc edge is located is in contact with the stator core to perform interaction, i.e., interference fit, thereby fixing the stator core. Therefore, the cutting part 133 has a smaller radial dimension in the axial direction near the O-terminal side, the insertion is easy to be performed when the motor end cover 10 is assembled with the stator core through the insertion action in the axial direction from the O' -terminal to the O-terminal, and the matching of the cutting part 133 and the stator core of the motor is tighter as the insertion goes deep, which is beneficial to the overall stability of the motor after the assembly.

In one or more embodiments, the end surfaces of the plurality of cutting portions 133 at the end remote from the extension portion 12 may be located on the same plane. That is, the axial O-side end surfaces of the cutting portions 133 are located on the same plane, and therefore, in the case where the stator core is placed on the axial O-side end surfaces of the cutting portions 133 during the assembly, the stator core can be supported in advance, preventing the stator core from being inclined, and facilitating the assembly work. However, the present invention is not limited thereto, and the end surfaces of the plurality of cutting portions 133 at the ends remote from the extension portion 12 may not be located on the same plane.

In one or more embodiments, as shown in fig. 1 and 2, the deformable leg 13 includes a leg body 131 and an engagement portion 132 provided at a radial outer periphery of the leg body 131, the engagement portion 132 for clearance-engagement with the stator core. That is, the stator core may be disposed radially inward of the fitting portion 132, and a gap may be provided between a radially outer circumferential surface of the stator core and a radially inner circumferential surface of the fitting portion 132, whereby, in an assembling process of the stator core to the deformable leg 13, by disposing the stator core radially inward of the fitting portion 132, a predetermined positioning of the stator core can be achieved, reducing an assembling difficulty.

In the present embodiment, the leg main body 131 may include a cutting portion 133 as a structure for interference fit with the stator core, and in addition, the leg main body 131 may further include a structure other than the cutting portion 133, which may be referred to as a main body portion 134.

In the present embodiment, the cutting portion 133 is located at a radially outer position of the body portion 134, such as a position near the radially outer side of the axial O-side end face 134 of the body portion 134, and protrudes toward the O-side with respect to the axial O-side end face 134S of the body portion 134. Thus, during the assembly of the stator core, the axial end face of the stator core first contacts the radially inner portion of the end face 133S of the cutting portion 133, and when the radially outer portion of the stator core relative to the end face 133S of the cutting portion 133 is displaced in the axial direction, the radially outer peripheral face of the stator core abuts against the cutting portion 133, and the axial end face of the stator core abuts against the axial end face 134S of the main body portion 134. Thus, the cutting portions 133 are provided on a plurality of surfaces, and the stator core can be more reliably assembled.

In one or more embodiments, as shown in fig. 2, the cutting portion 133 is provided at the radially inner peripheral surface of the mating portion 132, whereby, in the process of pressing the cutting portion 133 by the stator core so that the cutting portion 133 is deformed, the mating portion 132 can support the cutting portion 133 from the radially outer side while ensuring that the radially outer portion of the cutting portion 133 is not deformed, thereby enabling a reliable interference fit between the stator core and the deformable leg.

In one or more embodiments, the difference between the diameter of the circumscribed circle of the corresponding cutting portion 133 and the radial dimension of any one of the cutting portions 133 is smaller than the outer diameter of the stator core, that is, the difference between the diameter of the circumscribed circle of the corresponding cutting portion 133 and the outer diameter of the stator core is smaller than the radial dimension of any one of the cutting portions 133, wherein the outer diameter of the stator core may be the diameter of the circumscribed circle of the stator core as a whole or the diameter of the circumscribed circle of a plurality of portions of the stator core that are in interference fit with the deformable legs. That is, the difference between the diameter of the circumscribed circle corresponding to the cutting portion 133 and the outer diameter of the stator core is smaller than the radial dimension of the cutting portion 133 having the smallest radial dimension among the cutting portions 133. Thus, when the stator core is set to be positioned in the radial direction inside the engagement portion 132 of the deformable leg 13, the O-side end surface 133 of any of the cutting portions 133 has a portion that contacts the end surface of the stator core when the stator core is moved in any of the radial directions, and the stator core can be reliably pre-supported.

In this embodiment of the present application, the plurality of cutting portions 133 corresponds to a circumscribing circle, that is, when viewed from the axial direction, the radial outer sides of any cutting portion 133 are all located on the circumscribing circle, and the radial dimensions of the plurality of cutting portions 133 may be the same or different, where the radial dimension of any cutting portion 133 may be the radial dimension of the axial O-side end face 133 of the cutting portion 133 or the maximum dimension of the cutting portion 133 in the radial direction, and when the cutting portion 133 is disposed on the radial inner circumferential surface of the mating portion 132, the circumscribing circle corresponding to the cutting portion 133 is the inscribing circle of the plurality of mating portions 132, that is, when viewed from the axial direction, the radial inner sides of any mating portion 132 are all located on the inscribing circle. In the case where there is a difference in the radial dimension of the cutting portion 133, the difference between the diameter of the circumscribed circle (R) and the radial dimension (d) of the cutting portion 133 having the smallest radial dimension is smaller than the outer diameter (R) of the stator core, that is, R-d < R, for the cutting portion 133 having the smallest radial dimension. In the case where the radial dimensions of any of the cutting portions 133 are the same, the difference between the diameter of the circumscribed circle and the radial dimension of any of the cutting portions 133 is smaller than the outer diameter of the stator core. As a result, the stator core can be reliably pre-supported by the portions of the cutting portions 133 that are in contact with the axial end surfaces of the stator core.

In one or more embodiments, as shown in fig. 2, one end (O-end) of the deformable leg 13 is provided with a reservoir 135, the reservoir 135 being for storing flash generated during the assembly of the interference fit. For example, when the stator core presses the radially inner portion of the cutting portion 133 in the axial direction, the pressed portion of the cutting portion 133 protrudes to the surrounding to generate a burr, and thus, by providing the stock portion 135, the burr generated during the assembly of the interference fit can be effectively stored, and the assembly work can be easily performed.

The specific shape of the stock portion 135 is not limited in this application, for example, as shown in fig. 2, the stock portion 135 may be in a groove shape, which may be referred to as a stock groove, in other words, the axial O-side end surface 134S of the main body portion 134 of the leg main body 131 includes a first portion end surface 134Sa located radially inward for abutting against the stator core and a second portion end surface 134Sb located radially outward for providing the cutting portion 133, the second portion end surface 134Sb is closer to the O' end than the first portion end surface 134Sa, and a groove is formed between the second portion end surface 134Sb and two side surfaces connected thereto in the radial direction, wherein the radially outer side surface may be a radially inner circumferential surface of the mating portion 132, and therefore, during the assembly operation of performing the interference fit, the flash generated by the deformation of the cutting portion 133 may be accommodated in the groove, and the assembly operation is easy.

In such a structure, in the assembly of the motor end cover and the stator core, the second partial end surface 134Sb and the end surface on the axial side of the stator core 221 also have a gap S (see fig. 9), and the burr generated by the deformation of the cutting portion 133 can be accommodated, so that the assembly work of the stator core and the end cover is easy to realize.

However, the present application is not limited thereto, and the stock portion 135 may have other shapes.

For example, fig. 4 is another schematic view of an end cap according to an embodiment of the first aspect of the present application, fig. 5 is an enlarged schematic view of a portion B of the end cap shown in fig. 4, and fig. 4 and 5 show an example in which the stock portion is of another shape.

In one or more embodiments, as shown in fig. 4 and 5, the deformable leg 13 'includes a leg body 131' and an engagement portion 132 'provided at a radial outer periphery of the leg body 131', the engagement portion 132 'being for clearance engagement with the stator core, the leg body 131' including a body portion 134 'and a cutting portion 133' provided at an axial O-side end face 134S 'of the body portion 134', the cutting portion 133 'being provided at a radial inner peripheral surface of the engagement portion 132'.

In the embodiment of the present application, as shown in fig. 5, the cutting portion 133' is not provided in the groove, that is, the axial O-side end surface 134S ' of the body portion 134' is a flat surface in the entire radial direction, whereby the fabrication of the deformable leg is facilitated. In such a structure, the circumferential gap between the adjacent cutting portions 133' may be used as the stock portion 135', that is, the stock portion 135' is a gap surrounded by the adjacent two side surfaces of the adjacent cutting portions 133', the axial O-side end surface 134S ' of the main body portion 134', and the radially inner peripheral surface of the fitting portion 132 '. The stock portion 135 'thereof may include a gap surrounded by a side surface of the cutting portion 133' on one circumferential side, an axial O-side end surface 134S 'of the body portion 134', and a radial inner circumferential surface of the mating portion 132', corresponding to the cutting portions 133' on both circumferential ends.

In the embodiment of the present application, the deformable leg 13 may be integrally formed, for example, the body portion 134, the cutting portion 133, and the mating portion 132 may be integrally formed of the same material to form the deformable leg 13, but not limited thereto, for example, the cutting portion 133 may be formed solely of a material different from that of the body portion 134 and the mating portion 132, and then the body portion 134 and the mating portion 132 may be injection molded in a mold to form the deformable leg 13 when the cutting portion 133 is positioned in the mold, the cutting portion 133 may include a portion located inside the body portion 134 and a portion exposed to the body portion 134, and the portion exposed to the body portion 134 may be configured to be interference-fitted with the stator core, or the cutting portion 133 may be separately formed with the body portion 134 and the mating portion 132, and then the cutting portion 133 may be fixed to the body portion 134 and the mating portion 132 in a plurality of ways, for example, by bonding, clipping, or the like.

In one or more embodiments, the deformable leg 13 and the extension 12 may be made of the same material or different materials, and may be integrally formed, i.e., without assembling the deformable leg 13 and the extension 12, the process may be saved, but not limited thereto, and the deformable leg 13 and the extension 12 may be separately formed and then assembled.

In the embodiment of the present application, the number of the cutting portions 133 included in the single deformable leg 13 may be any number, such as 5 as shown in fig. 2, 3 and 5, but is not limited thereto, and may be, for example, 1, 2, 3, 4, or more than 5, etc., which is not limited thereto. The plurality of cutting portions 133 may be provided at intervals in the circumferential direction, for example, may be provided at equal intervals, may be provided at unequal intervals, or may be provided at partially equal intervals, which is not limited in this application.

In the embodiment of the present application, the cutting portions 133 may be formed of any deformable material, and the specific dimensions (including axial, circumferential and radial dimensions) of the individual cutting portions 133 are not particularly limited, and the circumferential spacing dimension between adjacent cutting portions 133 is also not particularly limited, so long as the cutting portions 133 and between adjacent cutting portions 133 are set to appropriate dimensions, so that the cutting portions 133 can be deformed during assembly to achieve interference fit with the stator core.

In one or more embodiments, as shown in fig. 1 and 4, an axial one end (O ' end) of the deformable leg 13 (13 ') may have a hollowed out portion 136 that radially penetrates, and an axial other end (O end) of the deformable leg 13 (13 ') has an axial through hole 137. Thus, the material consumption of the end cover can be further reduced by forming the hollowed-out portion 136, and the fixing member 23 (see fig. 7) can be further fixed to the motor end cover 10 and the stator core by inserting the fixing member into the axial through hole 137 by forming the axial through hole 137.

The motor end cover according to the embodiment of the present application has been described above from different angles by different embodiments, and the above embodiments may be arbitrarily combined, and the description is omitted here. The present application has been described above by way of example only, but the present application is not limited thereto, and various modifications may be made as appropriate based on the above embodiments, and reference may be made to the related art, and the description thereof is omitted here.

According to the above-described embodiment of the present application, in the motor end cover 10, the stator core of the motor is interference fit with the deformable leg 13, so that the reprocessing of the part of the motor end cover for assembling with other parts of the motor is not required, the processing cost can be saved, and in addition, the part (such as the connecting rib) for ensuring the processing strength is not required to be arranged on the motor end cover 10, the material of the motor end cover can be saved, and therefore, the processing cost and the material cost are saved.

Embodiments of the second aspect

Embodiments of the second aspect of the present application provide an electric machine having the motor end cap 10 described in the embodiments of the first aspect. Since the structure of the motor end cover 10 has been described in detail in the embodiment of the first aspect, the contents thereof are incorporated herein, and the description thereof is omitted.

Fig. 6 is a schematic view of an electric motor according to an embodiment of the second aspect of the present application, which is a schematic perspective view of the electric motor;

FIG. 7 is another schematic view of an electric machine according to an embodiment of the second aspect of the present application, showing components of the electric machine in an exploded condition; fig. 8 is a schematic cross-sectional view of the motor of the embodiment of the second aspect of the present application, showing the case of cutting the motor along a plane passing through the center of the rotation axis.

As shown in fig. 6 to 8, the motor 20 includes a rotor 21, a stator 22, and a motor end cover 10, and the rotor 21 has a rotation shaft 211 that rotates around a central axis UU'.

As shown in fig. 8, the stator 22 is provided radially outside the rotor 21, and the stator 22 includes a stator core 221 and a winding 222 wound around the stator core 221.

Fig. 9 is an enlarged schematic view of a portion C of the motor shown in fig. 8.

As shown in fig. 9, the deformable leg 13 of the motor end cover 10 is interference-fitted with the stator core 221, for example, a broken line portion indicated by an arrow 133 in fig. 9 is a cut portion 133 of the deformable leg 13 before the motor end cover 10 and the stator core 221 are assembled, and a radially outer peripheral surface 221S of the stator core 221 is located between a radially outermost side and a radially innermost side of the cut portion 133 before the assembly, wherein the radially outer peripheral surface 221S refers to a radially outer peripheral surface of a portion of the stator core 221 which is interference-fitted with the deformable leg 13, and in an assembled state, a portion of the cut portion 133 which overlaps the stator core 221 in an axial direction, that is, a radially inner portion is pressed by the stator core 221 to become a burr W which can be accommodated in a stock portion formed in the deformable leg 13, and with respect to the explanation of the stock portions 135 and 135' in the embodiment of the first aspect described above can be seen. The stock portion may include a gap S between an axial end surface 221T of the stator core 221 and a portion of an axial end surface of the body portion 134 of the leg body 131, the axial end surface 221T of the stator core 221 further including a portion that abuts against the axial end surface 134S of the body portion 134 of the deformable leg, and a radially outer portion (i.e., a portion that overlaps the gap V in the axial direction) of the cutting portion 133 abuts against a radially outer circumferential surface 221S of the stator core, thereby achieving an interference fit of the stator core 221 and the motor end cover 10.

In the embodiment of the present application, as shown in fig. 9, a gap V, that is, a clearance fit, may also be provided between the radially outer peripheral surface 221S of the stator core 221 and the radially inner peripheral surface of the fitting portion 132 of the deformable leg 13, enabling pre-positioning between the stator core and the motor end cover 10 during assembly.

An exemplary process for assembling the motor end cap 10 and the stator 22 of the motor is described below.

In this embodiment of the present application, in the assembly operation of the motor end cover 10, the motor end cover 10 may move in the axial direction UU' with respect to the stator, so that the stator core 221 is located radially inside the motor end cover 10, for example, the stator core 221 is located radially inside the mating portion 132 of the deformable leg 13, and the stator core 221 is in a state of being pre-supported by the deformable leg 13 of the motor end cover 10, in this pre-supporting state, a radially outer portion of the axial end surface 221T of the stator core 221 is in contact with a radially inner portion of a structure (such as the cutting portion 133) of the deformable leg 13 for interference fit with the stator core 221, a gap V is provided between a radially outer circumferential surface 221S of the stator core 221 and a radially inner circumferential surface of the mating portion 132 of the deformable leg 13, and then the motor end cover 10 is made axially move with respect to the stator core 221, and the stator core 221 presses and deforms the radially inner portion of the cutting portion 133 until the axial end surface 221T of the stator core 221 abuts against the axial end surface 134S of the body portion 134 of the leg body 131, in this pre-supporting state, in which a portion of the radially outer circumferential surface 221T of the stator core 221 abuts against a radially inner portion of the structure (such as the cutting portion 133) for interference fit with the radially inner portion of the stator core 221), and the radially outer circumferential surface 221S of the mating portion 132 is located, and the radially inner portion of the mating portion is located, such that the mating portion is located.

In one or more embodiments, as shown in fig. 6-8, the motor 20 may have two motor end caps 10 disposed at both axial ends. The respective engaging portions 132 of the two motor end caps 10 are each in clearance fit, i.e., clearance fit, with the radially outer peripheral surfaces of the axial ends of the stator core 221, and the respective deformable legs 13 of the two motor end caps 10 are respectively in interference fit with the axial ends of the stator core 221. This makes it possible to fix the stator 22 more firmly.

In one or more embodiments, as shown in fig. 7, a through hole 2212 is provided in a position of the stator core 221 facing the axial through hole 137 of the deformable leg 13, and a fixing member (e.g., a rivet 23, as shown in fig. 8) can pass through the axial through hole 137 of the deformable leg 13 of the motor end cover 10 on the axial U' side, the hole 2212 of the stator core 221, and the axial through hole 137 of the deformable leg 1313 of the end cover 10 on the axial U side in this order in the axial direction, whereby the motor end cover 10 can be reliably fixed.

In one or more embodiments, as shown in fig. 7, the stator core 221 may include a boss 2213 provided at an outer periphery, the boss 2313 including a wall portion having a larger radial dimension on both sides in a circumferential direction and a concave surface between both side wall portions in the circumferential direction, the concave surface including an outer circumferential surface portion 221S that is interference-fitted with the deformable leg 13. Thus, in the case of assembling the end cover 10, the motor end cover 10 can be inserted into the stator 22 in the axial direction by aligning the engaging portion 132 with the concave surface of the boss 2213, and the circumferential positioning at the time of assembly can be easily performed.

In the present embodiment, the motor 20 is a motor for various devices or apparatuses, and may be used for various home appliances, office automation apparatuses, industrial apparatuses, and the like, for example.

The motor according to the embodiment of the present application has been described above, and the above embodiments may be arbitrarily combined, and the description thereof is omitted here. Further, the present application has been described above by way of example only, but the present application is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments, and the stator of the motor may include an insulator or the like, the rotor may include a core or the like, and the description thereof may be omitted herein with reference to the related art.

It should be noted that fig. 6 to 9 illustrate the motor as an inner rotor structure and the motor end cover mounted on the stator, but the application is not limited thereto, for example, the motor may be an outer rotor structure, in which case the motor end cover may be mounted on the outer rotor.

According to the embodiment of the application, in the motor including the end cover of the embodiment of the first aspect, the motor end cover is in interference fit with the stator core of the motor through the deformable supporting leg, so that the reprocessing of the part of the motor end cover for assembling with other parts of the motor is not needed, the processing cost can be saved, and in addition, the part (such as the connecting rib) for ensuring the processing strength is not needed to be arranged on the motor end cover, so that the material consumption of the end cover can be saved, and the processing cost and the material consumption are saved.

Embodiments of the third aspect

Embodiments of the third aspect of the present application provide an electrical product having the motor 20 described in the embodiments of the second aspect. Since in the embodiment of the second aspect, the structure of the motor 20 has been described in detail, the contents thereof are incorporated herein, and the description thereof is omitted.

In the embodiment of the present application, the electric product may be any device or equipment using the motor 20, including various home electric appliances, office automation equipment, industrial equipment, on-vehicle devices, or constituent parts in various equipment, and the like.

The present application has been described in connection with specific embodiments, but it should be apparent to those skilled in the art that these descriptions are intended to be illustrative and not limiting. Various modifications and alterations of this application may occur to those skilled in the art in light of the spirit and principles of this application, and are to be seen as within the scope of this application.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.

Claims (10)

1. A motor end cap, the motor end cap comprising:

a center portion;

a plurality of extension portions, one end of which is provided on a radial outer peripheral surface of the center portion; and

and the deformable support leg is arranged at the other end of at least one extension part of the plurality of extension parts and is used for being in interference fit with a stator core of the motor.

2. The motor end cap of claim 1, wherein,

the deformable support leg comprises a support leg main body extending along the axial direction and a matching part arranged at one end, far away from the extending part, of the support leg main body, wherein the matching part is used for being in clearance fit with the stator core.

3. The motor end cap of claim 1, wherein,

one end of the deformable supporting leg is provided with a storage part, and the storage part is used for storing overflows generated in the assembling process of the interference fit.

4. The motor end cap of claim 1, wherein,

the deformable leg includes a plurality of cutting portions located at a side away from the extension portion in an axial direction, the plurality of cutting portions being disposed at intervals in a circumferential direction.

5. The motor end cap of claim 4, wherein,

the cross section of the cutting part is any one or combination of the following when seen from the circumferential direction: rectangular, trapezoidal, and triangular.

6. The motor end cap of claim 5, wherein,

the end surfaces of the plurality of cutting portions at the ends remote from the extension portions are located on the same plane.

7. The motor end cap of claim 4, wherein,

the difference between the diameter of the circumscribed circle of the plurality of cutting portions and the radial dimension of any one of the cutting portions is smaller than the outer diameter of the stator core.

8. The motor end cap of claim 1, wherein,

the number of the extension parts is 3 or 4.

9. An electric machine, the electric machine comprising:

a rotor having a rotation shaft rotating around a central axis;

a stator provided radially outward of the rotor, the stator including a stator core and a winding wound around the stator core; and

the motor end cap of any one of claims 1 to 8, the deformable leg being an interference fit with the stator core.

10. An electrical product having the motor of claim 9.