MOTOR AND ELECTRICAL DEVICE INCLUDING SAME

A motor includes a housing and a first press-in member pressed into the housing. An inner surface of the housing is provided with a first opposing surface and a second opposing surface opposite to the first press-in member in a radial direction. The first opposing surface is located on a side of the second opposing surface in an axial direction. The first opposing surface abuts against a portion of a surface of the first press-in member in the radial direction, and at least a portion of a surface, abutting against the first press-in member, of the first opposing surface is a smooth surface. The second opposing surface does not abut against the first press-in member in the radial direction, and includes a roughened surface.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims priority under 35 U.S.C. § 119 to Chinese Application No. 201910468602.2 filed on May 31, 2019, the entire contents of which are hereby incorporated herein by reference.

The disclosure relates to a motor and an electrical device.

During assembly of an inner rotor motor, a stator iron core needs to be pressed into the housing of the motor. Since the housing is normally subjected to a casting molding process, the inner surface thereof is a rough surface which is uneven and has a relatively large amount of friction. Therefore, it is difficult to press the stator iron core into the housing.

In the related art, before the stator iron core is pressed into the housing, the inner surface of the housing is normally subjected to a cutting process to provide a smoother surface, so as to make it possible to easily press the stator iron core into the housing.

It should be noted that the introduction in Background is merely provided for the convenience of clearly and comprehensively describing the technical solutions of the disclosure and facilitating the understanding of those skilled in the art. These technical solutions discussed above shall not be deemed well-known by those skilled in the art simply for having been described in Background.

SUMMARY

The inventors of the instant application discovered that processing the entire inner surface of a housing to be a smooth surface takes time and effort, such that the assembling efficiency is lower.

According to a first example embodiment of the present invention, a motor includes a rotating shaft extending along a central axis, a housing arranged about the rotating shaft, and a first press-in member pressed into the housing. An inner surface of the housing is provided with a first opposing surface and a second opposing surface that are opposite to the first press-in member in a radial direction, where the first opposing surface is located on a side of the second opposing surface in an axial direction. The first opposing surface abuts against a portion of a surface of the first press-in member in the radial direction, and at least a portion of a surface, abutting against the first press-in member, of the first opposing surface is a smooth surface. The second opposing surface does not abut against the first press-in member in the radial direction, and the second opposing surface is a rough surface.

According to a second example embodiment of the present invention, an electrical device includes the motor according to the first example embodiment.

DETAILED DESCRIPTION

The foregoing and other features of the disclosure will become apparent from the following specification with reference to the accompanying drawings. Specific example embodiments of the present disclosure are disclosed in the following specification and the accompanying drawings. The following specification and the accompanying drawings describe several example embodiments to which the principles of the disclosure are applicable. However, it should be understood that, the present disclosure is not limited to the example embodiments described herein, but shall include all modifications, variations and equivalents falling within the scope of the appended claims.

In the example embodiments of the present disclosure, terms such as “first”, “second”, “upper”, “lower” are used to distinguish different elements in terms of names, and are not used to indicate a spatial arrangement or a time sequence of these elements, and these elements should not be limited by these terms. The term “and/or” includes any and all combinations of one or more of listed associated terms. Terms such as “comprise”, “include”, and “have” refer to the existence of the described features, elements, devices or components, but do not exclude the existence or addition of one or more other features, elements, devices or components.

In the example embodiments of the present disclosure, singular forms such as “a/an” and “the” include plural forms and should be understood in a broad sense as a meaning of “a type” or “a kind” instead of “one”. In addition, the term “the” should be understood as including both a singular form and a plural form, unless otherwise clearly stated in the context. In addition, the term “according to” should be understood as “at least partially according to . . . ”, and the term “based on” should be understood as “at least partially based on . . . ”, unless otherwise clearly stated in the context.

In addition, in the following descriptions of the example embodiments of the present disclosure, a radial direction with a central axis of a rotating shaft of a motor as a center is referred to as a “radial direction”, a direction surrounding the central axis is referred to as a “circumferential direction”, a direction along the central axis or a direction parallel or substantially parallel to the central axis is referred to as an “axial direction” or an “extending direction of an axial direction”, a side away from the central axis in the radial direction is referred to as a “radial outer side”, and a side close to the central axis in the radial direction is referred to as a “radial inner side”. However, these definitions are only for convenience of description and are not intended to limit the directions of the motor during manufacturing and in use.

Example Embodiment 1 of the disclosure provides a motor.FIG. 1is a cross-sectional view of the motor in Exemplary Example Embodiment 1 of the disclosure along a central axis.FIG. 2is a schematic view of a housing observed from a perspective.FIG. 3is an enlarged partial view of a portion indicated with a dotted circle inFIG. 1.

In one or more example embodiments of the present disclosure, as shown inFIG. 1, a motor1preferably includes a rotating shaft10extending along a central axis S, a housing11arranged about the rotating shaft10, and a first press-in member12. During assembly of the motor1, the first press-in member12is pressed into the housing11.

As shown inFIG. 2, an inner surface of the housing11is provided with a first opposing surface111and a second opposing surface112. The first opposing surface111is located on a side of the second opposing surface112in an axial direction. As shown inFIG. 3, the first opposing surface111is opposite to the first press-in member12in a radial direction. The first opposing surface111abuts against a portion of a surface of the first press-in member12in the radial direction. At least a portion of a surface, abutting against the first press-in member12, of the first opposing surface111is a smooth surface. The second opposing surface112does not abut against the first press-in member12in the radial direction, and the second opposing surface112is preferably a rough surface.

In this way, it is possible to process only at least a portion of the surface, abutting against the press-in member12, of the first opposing surface111to be a smooth surface, and there is no need to process the second opposing surface112that does not abut against the first press-in member12. Accordingly, a processing range in which the inner surface of the housing11is made to have a smooth surface is reduced, while ensuring that the press-in member12is able to be easily pressed into the housing11, thus shortening the time required to process the inner surface of the housing11and facilitating the working efficiency.

In one or more example embodiments of the present disclosure, it may be that an entirety of the first opposing surface111is processed to be a smooth surface, or it may also be that only a portion of the surface abutting against the first press-in member12is processed to be a smooth surface. The present example embodiment of the disclosure does not impose a limitation in this regard, provided that the smooth portion of the first opposing surface111allows the first press-in member12to be successfully pressed into the housing11. In this way, the processing range in which the inner surface of the housing11is a smooth surface is reduced, thus further shortening the time required to process the inner surface of the housing11, and facilitating the working efficiency.

In one or some example embodiments, as shown inFIG. 3, a total axial height h1of the first opposing surface111is preferably less than a half of a total axial height h2of the first press-in member12. Therefore, in a case that the first press-in member12is ensured to be reliably secured on the inner surface of the housing, the processing range in which the inner surface of the housing is a smooth surface is further reduced.

In an example embodiment of the present disclosure, the first opposing surface111is preferably located, relative to the second opposing surface112, on a side of the housing11in the axial direction that is the same or substantially the same as a press-in direction of the first press-in member12. In other words, a portion of the first press-in member12on a side in the axial direction located at the press-in direction abuts against the first opposing surface111located on a side at the press-in direction of the housing11after passing through the second opposing surface112during a press-in process. In this way, the first press-in member12is easily pressed into the housing11.

In an example embodiment of the present disclosure, the first opposing surface111is located farther toward a radially inner portion of the housing11than the second opposing surface112is. As shown inFIG. 3, a first radial distance d1from the first opposing surface111to the central axis S of the housing11is preferably less than a second radial distance d2from the second opposing surface112to the central axis S of the housing11. The inner surface of the housing11preferably further includes a guiding surface113. The guiding surface113connects the first opposing surface111and the second opposing surface112, and is a rough surface. The guiding surface113may preferably be a curved substantially “r”-shaped inclined surface extending from the second opposing surface112to the first opposing surface111in the press-in direction, or may alternatively be a straight-sloped or substantially straight-sloped surface. The present example embodiment of the present disclosure does not impose a limitation in this regard. In this way, the guiding surface113is easily to be molded.

In an example embodiment of the present disclosure, the radial size of the first press-in member12from an end to the other end in the axial direction preferably remains the same. For example, the first press-in member12is cylindrical or substantially cylindrical, rectangular or substantially rectangular, or the like. The present example embodiment of the disclosure does not impose a limitation in this regard.

In this way, when abutting against the first opposing surface111, the first press-in member12does not abut against the second opposing surface112. Therefore, only the portion of the first opposing surface111that abuts against the first press-in member12and is located on a side of the housing11in the axial direction needs to be processed, and there is no need to process the second opposing surface112located on the other side of the housing11in the axial direction. In this way, the processing range in which the inner surface of the housing is a smooth surface is reduced, thus shortening the time for processing the inner surface of the housing11, and facilitating the working efficiency.

In one or some example embodiments, as shown inFIG. 2, the inner surface of the housing11is preferably further provided with a third opposing surface114. The third opposing surface114is located on the other side of the second opposing surface112in the axial direction. As shown inFIG. 3, the third opposing surface114is located farther at the radially outer side of the housing11than the second opposing surface112is. A third radial distance d3from the third opposing surface114to the central axis S of the housing11is preferably greater than the second radial distance d2from the second opposing surface112to the central axis S of the housing11.

As shown inFIG. 1, the motor1preferably further includes a second press-in member13. During assembly of the motor1, the second press-in member13is pressed into the housing11. As shown inFIG. 3, the third opposing surface114abuts against the second press-in member13in the radial direction, and at least a portion of the surface, abutting against the second press-in member13, of the third opposing surface114is a smooth surface. In this way, it is ensured that the second press-in member13is easily pressed into the housing11.

In one or some example embodiments, as shown inFIG. 3, at least a portion of the third opposing surface114is opposite to the first press-in member12in the radial direction. In this way, a size error of the first press-in member12or the second press-in member13in the radial direction and a size error in the radial direction during a press-in process is absorbed by the third opposing surface114, thus lowering the precision requirement on the size of the first press-in member12during processing and molding, and further facilitating the working efficiency.

FIG. 4is a top view of the first press-in member in the housing. In one or some example embodiments, as shown inFIG. 4, the first press-in member12is provided with a first protrusion portion121protruding toward the radially outer side of the housing11, the inner surface of the housing11is further provided with a first recessed portion115recessed toward the radial outer side of the housing11, and the first protrusion portion121is able to be inserted into the first recessed portion115.

In, this way, the first press-in member12is positioned in the circumferential direction of the housing11by the first protrusion portion121and the first recessed portion115. It may be that an outer circumferential surface of the first protrusion portion121does not abut against the first recessed portion115, and that an inner surface of the first recessed portion115is a rough surface. In this way, the processing range in which the inner surface of the housing is a smooth surface is further reduced. In addition, the quantity of the first protrusion portion121is not limited in the present example embodiment. There may be one, two, or more first protrusion portions, provided that the first press-in member12is positioned accordingly.

FIG. 5is a top view of the second press-in member, andFIG. 6is a side view of the second press-in member. In one or some example embodiments of the present disclosure, as shown inFIG. 5andFIG. 6, the second press-in member13is provided with a second protrusion portion131protruding toward the radially outer side. As shown inFIG. 2, the inner surface of the housing11is further provided with a second recessed portion116recessed toward the radially outer side of the housing11, and the second protrusion portion131is able to be inserted into the second recessed portion116. In this way, the second press-in member13is positioned in the circumferential direction in the housing11by the second protrusion portion131and the second recessed portion116. It may be that an inner surface of the second recessed portion116does not abut against an outer circumferential surface of the second protrusion portion131, and that an inner surface of the second recessed portion116is a rough surface. In this way, the processing range in which the inner surface of the housing is a smooth surface is further reduced.

In an example embodiment of the present disclosure, as shown inFIG. 6, the second protrusion portion131is preferably located on a side of the second press-in member13in the axial direction, an outer circumferential surface132of the second press-in member13on a side in the axial direction and within an axial height range of the second protrusion portion131is a rough surface, an outer circumferential surface of the second press-in member13on the other side in the axial direction is a smooth surface, and the rough surface132of the second press-in member does not abut against the inner circumferential surface of the housing11. In this way, the processing difficulty of the second press-in member13is alleviated, and the processing range in which the inner surface of the housing11is a smooth surface is further reduced.

In addition, the quantity of the second protrusion portion131is not limited in the present example embodiment of the present disclosure. There may be one, two, or more second protrusion portions, provided that the second press-in member13is positioned accordingly.

In another example embodiment of the present disclosure, the second protrusion portion131may further include other portions of the second press-in member13that protrude toward the radially outer side of the housing11, such as a handle, a ring, etc. The present example embodiment of the disclosure does not impose a limitation in this regard.

In one or more example embodiments of the present disclosure, the first press-in member12may preferably be, for example, a stator iron core of the motor, but the present example embodiment is not limited thereto. The first press-in member12may also be another component able to be pressed in the housing11. In addition, the second press-in member13may be, for example, a bearing holder of the motor, but the present example embodiment is not limited thereto. The second press-in member13may also be another component able to be pressed into the housing11, such as a cover. It is only required or preferred that the first press-in member12or the second press-in member13abuts against the inner surface of the housing11, and at least a portion of the inner surface of the housing11that abuts against the component is processed to be a smooth surface, so that the component is easily pressed into the housing11, and the processing range in which the inner surface of the housing is a smooth surface is reduced.

In one or more example embodiments of the present disclosure, the first recessed portion115and the second recessed portion116that are shown inFIG. 2are located on the same position in the circumferential direction of the housing11, but the present example embodiment of the present disclosure is not limited thereto. The first recessed portion115and the second recessed portion116may also be located at different positions in the circumferential direction of the housing11. In addition, the quantity of the first recessed portion115or second recessed portion116is also not limited in the present example embodiment of the present disclosure, provided that the first recessed portion115and the second recessed portion116respectively fit the first protrusion portion121and the second protrusion portion131to position the first press-in member12and the second press-in member13.

According to the present example embodiment of the disclosure, at least a portion of the inner surface, abutting against the press-in member, of the housing is processed to be a smooth surface, thus shortening a time required to process the inner surface of the housing and facilitating the working efficiency while ensuring that the press-in member is easily pressed into the housing.

An electrical device according to an example embodiment of the present disclosure includes a motor as described above. In the present example embodiment of the present disclosure, the structure of the electrical device is not limited. The electrical device may be a household appliance such as a brake system, an air conditioner, a water dispenser, a washing machine, a sweeper, a compressor, an air supply fan, or a mixer, or may be an electrical device of another field.

According to the present example embodiment of the present disclosure, at least a portion of the inner surface, abutting against the press-in member, of the housing is processed to be a smooth surface, so that the time required to process the inner surface of the housing is shortened and the working efficiency is facilitated, while ensuring that the press-in member is easily pressed into the housing, thus improving the efficiency for assembling the electrical device.

The foregoing describes the disclosure with reference to specific example embodiments. However, a person skilled in the art should understand that these descriptions are exemplary, and are not intended to limit the protection scope of the present disclosure. A person skilled in the art may make various variations and modifications to the disclosure based on the spirit and principles of the disclosure, and those variations and modifications also fall within the scope of the disclosure.