阅读说明：本技术 电动机组件 (Motor assembly ) 是由 金成国 金湖锡 金熙运 池荣珍 于 2017-07-27 设计创作，主要内容包括：本发明的电动机包括：外壳,包括形成有第一轴承容纳部的底部和从底部边缘延伸的圆筒状侧面部；转子组件,包括旋转轴和安装于旋转轴外周面且容纳于外壳内部；定子组件,容纳于外壳内部且围绕转子；外壳盖,与外壳上端结合,在其中央部形成有第二轴承容纳部；导流件,安装于外壳盖的上侧；叶轮,在导流件上侧连接于旋转轴；叶轮盖,用于覆盖叶轮；第一轴承,容纳于第一轴承容纳部,旋转轴的一端部插入于第一轴承；以及第二轴承,容纳于第二轴承容纳部,旋转轴的另一端部插入于第二轴承,外壳盖可包括：盖主体,在其内侧形成有开口部；多个连接臂,用于使第二轴承容纳部和开口部的边缘相连接；以及导向肋,从开口部的边缘延伸而成。(The motor of the present invention includes: a housing including a bottom portion formed with a first bearing housing portion and a cylindrical side surface portion extending from an edge of the bottom portion; a rotor assembly including a rotating shaft and a housing mounted on an outer circumferential surface of the rotating shaft; a stator assembly accommodated inside the housing and surrounding the rotor; a housing cover combined with the upper end of the housing and having a second bearing receiving part formed at the center thereof; a guide member installed at an upper side of the housing cover; an impeller connected to the rotating shaft at an upper side of the guide member; an impeller cover for covering the impeller; a first bearing accommodated in the first bearing accommodating portion, wherein one end portion of the rotating shaft is inserted into the first bearing; and a second bearing accommodated in the second bearing accommodation portion, the other end portion of the rotation shaft being inserted into the second bearing, the housing cover may include: a cover main body having an opening formed in an inner side thereof; a plurality of connecting arms for connecting the second bearing receiving portion and the edge of the opening portion; and a guide rib extending from an edge of the opening portion.)

1. An electric motor, comprising:

a housing including a bottom portion formed with a first bearing housing portion and a cylindrical side surface portion extending from an edge of the bottom portion;

a rotor assembly including a rotating shaft and a rotor mounted to an outer circumferential surface of the rotating shaft and accommodated inside the housing;

a stator assembly received inside the housing and surrounding the rotor;

a housing cover coupled to an upper end of the housing, the housing cover having a second bearing receiving portion formed at a central portion thereof;

a guide member installed at an upper side of the housing cover;

an impeller connected to the rotating shaft at an upper side of the guide member;

an impeller cover for covering the impeller;

a first bearing accommodated in the first bearing accommodating portion, one end portion of the rotating shaft being inserted into the first bearing; and

a second bearing accommodated in the second bearing accommodation portion, the other end portion of the rotation shaft being inserted into the second bearing,

the housing cover includes:

a cover main body having an opening formed inside thereof;

a guide rib formed in a circular sleeve shape along an inner side edge of the cover main body;

a plurality of link arms having one ends connected to the second bearing receiving portion and the other ends connected to the guide ribs;

and a plurality of air guide grooves (141b) recessed from edges of the opening portion corresponding to between a plurality of the connection arms adjacent in a circumferential direction of the opening portion toward an outer side edge side of the cover main body.

2. The motor according to claim 1,

the guide rib has an outer diameter equal to an inner diameter of the side surface portion such that an outer circumferential surface of the guide rib contacts an inner circumferential surface of the side surface portion when the housing cover is mounted to the housing.

3. The motor according to claim 1,

the housing includes:

a housing cover mounting part bent and extended from an upper end of the side surface part;

a plurality of air guide grooves (111e) formed in an arc shape recessed from the edge of the side surface portion toward the radial direction of the side surface portion;

and a plurality of coupling holes formed in the housing cover mounting portion.

4. The motor according to claim 3,

the housing cover further includes:

inner side connecting holes formed in the plurality of connecting arms, respectively;

and a plurality of outer coupling holes formed in the cap body.

5. The motor according to claim 4, wherein,

a plurality of coupling members penetrating the plurality of coupling holes are inserted into the plurality of outer coupling holes.

6. The motor according to claim 5,

if the housing cover is coupled to the housing, the air guide groove (141b) of the housing cover and the air guide groove (111e) of the housing are aligned in the axial direction of the rotating shaft.

7. The motor according to claim 6,

the air guide groove of the case cover and the air guide groove of the case are formed in an arc shape with the same curvature.

Technical Field

The present invention relates to a motor assembly.

Background

In general, a vacuum cleaner is a home appliance that sucks in foreign substances such as dust and collects them in a separate dust collecting part provided inside a main body.

In detail, the vacuum cleaner requires a high suction force in order to effectively suck the foreign substances, and the intensity of the suction force is proportional to the rotational force of the motor. That is, the higher the rotational force of the motor, the higher the rotational speed of the fan connected to the motor, and the suction force to foreign substances may increase.

In korean laid-open patent No. 2008-0018744 (2008/28/2), a conventional vacuum cleaner motor is disclosed.

As disclosed in the related art, both end portions of the rotating shaft of the motor for the vacuum cleaner are supported by an upper bearing and a lower bearing. And, a rotor assembly is mounted to the rotating shaft between the upper bearing and the lower bearing.

Also, the lower bearing is installed at the center of the bottom of the motor housing, and the upper bearing is installed at the center of the bearing housing. The bearing housing is fixed to an upper surface of the motor housing.

At this time, the bearing housing is fixed to the motor housing by inserting a coupling projection projecting downward from an outer edge of the bearing housing into a coupling hole formed in an upper surface of the motor housing. Alternatively, coupling members such as screws are inserted into coupling holes of the motor housing instead of the coupling protrusions through the edge of the bearing housing, thereby fixing the bearing housing to the motor housing.

Here, in order to facilitate the coupling, a diameter of a coupling hole formed in the motor housing is generally slightly larger than an outer diameter of the coupling boss. That is, there is a coupling tolerance to some extent caused by the diameter of the coupling hole being larger than the outer diameter of the coupling projection.

Due to such a coupling tolerance, the bearing housings may be coupled to each other while being shifted in the circumferential direction and the radial direction of the motor housing in a state where the coupling projection is inserted into the coupling hole.

Even if the bearing housing is assembled by being shifted in the circumferential direction of the motor housing, the rotation shaft of the motor can be kept in a state of being aligned with the central axis of the motor housing, and therefore, this does not cause a problem.

However, when the bearing housing is assembled to be offset in the radial direction of the motor housing, a phenomenon occurs in which the rotation shaft of the motor is eccentric at a predetermined angle from the central axis of the motor housing. Further, since the rotating shaft of the motor is eccentric, the wear of the bearing is increased during high-speed rotation, which adversely affects the life of the bearing. Also, the shortened life of the bearing means shortened life of the motor.

In addition, recently, consumers have an increasing demand for increasing the amount of foreign matter collected by increasing the volume of the foreign matter collecting part without increasing the size of the main body of the vacuum cleaner. For this reason, a method of reducing the size of the motor is proposed.

Further, when the size of the motor is reduced, the size of the impeller is also reduced, and therefore, the rotation speed of the motor must be increased so as not to reduce the suction force of the motor. As the motor rotation speed increases, a problem of shortening of the bearing life caused by eccentricity of the motor rotation shaft may occur. That is, if the rotation speed of the motor is increased under the condition of the same eccentric amount, the vibration of the motor rotation shaft becomes large, and the wear of the bearing becomes large. As a result, the bearing life is shortened.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems.

To achieve the above object, a motor according to an embodiment of the present invention includes: a housing including a bottom portion formed with a first bearing housing portion and a cylindrical side surface portion extending from an edge of the bottom portion; a rotor assembly including a rotating shaft and a rotor mounted to an outer circumferential surface of the rotating shaft and accommodated inside the housing; a stator assembly accommodated inside the housing and surrounding the rotor; a housing cover combined with an upper end of the housing and formed with a second bearing receiving part at a central portion thereof; a guide member installed at an upper side of the housing cover; an impeller connected to the rotating shaft at an upper side of the guide; an impeller cover covering the impeller; a first bearing that is accommodated in the first bearing accommodating portion, and in which one end portion of the rotating shaft is inserted; and a second bearing accommodated in the second bearing accommodation portion and having the other end portion of the rotation shaft inserted into the second bearing, wherein the housing cover may include: a cover body (cover body) having an opening formed on the inner side thereof; a plurality of connecting arms for connecting the second bearing receiving portion and an edge of the opening portion; and a guide rib extending from an edge of the opening portion.

According to the motor of the embodiment of the present invention having the above-described structure, the guide sleeve 113 extending from the bottom surface of the housing cover 14 is in close contact with the inner peripheral surface of the motor housing 11, and therefore, the following effects are obtained: during the process of coupling the housing cover 14 to the motor housing 11, the housing cover 14 does not shift in the radial direction of the motor housing 11.

Further, since the rotating shaft of the motor does not deviate from the central axis of the motor, there is an advantage that the wear of the bearing supporting the rotating shaft of the motor can be minimized in a state where the motor is rotated at a high speed.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the motor.

Fig. 3 is a longitudinal sectional view of the motor, taken along line I-I of fig. 1.

Fig. 4 is an exploded perspective view of a housing and a housing cover constituting a motor of an embodiment of the present invention, viewed from above.

Fig. 5 is an exploded perspective view of the housing and the housing cover as viewed from below.

Fig. 6 is a longitudinal sectional view taken along line II-II of fig. 4 in a state where the housing cover and the housing are coupled.

Detailed Description

Hereinafter, a motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a perspective view of a motor according to an embodiment of the present invention, fig. 2 is an exploded perspective view of the motor, and fig. 3 is a longitudinal sectional view of the motor, cut along line I-I of fig. 1.

Referring to fig. 1 to 3, a motor 10 of an embodiment of the present invention may include: a housing 11; a housing cover 14 attached to an upper surface of the housing 11; a stator assembly 12 fixed to the inside of the housing 11; a rotor assembly 13 rotatably disposed inside the stator assembly 12; a guide member 15 fixed to an upper surface of the housing cover 14; an impeller 16 disposed above the air guide 15 and connected to the rotor assembly 13; and an impeller cover 17 for covering the impeller 16 and fixed to the housing 11.

Specifically, an air suction port 171 is formed in an upper surface (or a front surface) of the impeller cover 17, and when the impeller 16 rotates, air outside the motor 10 is sucked into the motor 10 through the air suction port 171.

In addition, the air guide 15 functions to guide the air sucked through the air suction port 171 to the side of the housing 11. In detail, the flow guide 15 may include: a disc-shaped guide body 151; and a plurality of guide vanes 152 formed on an outer circumferential surface of the guide body 151. A through hole 154 is formed in the center of the guide body 151, and the upper bearing receiving portion 142 (see fig. 4) formed in the center of the housing cover 14 is inserted into the through hole 154. Also, a plurality of coupling holes 153 may be formed at the edge of the through-hole 154.

In addition, the rotor assembly 13 may include: a rotating shaft 131; a rotor 132 fixed to an outer circumferential surface of the rotary shaft 131 and rotating integrally with the rotary shaft 131; an upper bearing 135 inserted into the rotary shaft 131 from the front (or above) of the rotor 132; a lower bearing 133 inserted into the rotary shaft 131 from a rear end (or a lower end) of the rotor 132; an upper stopper 136 for preventing the upper bearing 135 from moving along the rotation shaft 131; and a lower stopper 134 for preventing the lower bearing 133 from moving along the rotation shaft 131.

Here, either one of the upper bearing 135 and the lower bearing 144 may be defined as a first bearing, and the other may be defined as a second bearing. Also, either one of the upper stopper 136 and the lower stopper 134 may be defined as a first stopper, and the other may be defined as a second stopper.

The impeller 16 is attached to the front end (or upper end) of the rotary shaft 131, and thus the rotary shaft 131 and the impeller 16 rotate integrally. The rotor 132 is rotated by electromagnetic induction generated between the rotor 132 and the stator assembly 12, and the rotary shaft 131 is rotated integrally with the rotor 132.

If the upper bearing 135 and the lower bearing 133 are not accurately aligned, noise and vibration may be generated during the rotation of the motor. In detail, when the rotation shaft 131 is eccentric by a predetermined angle from the center line of the motor 10, noise and vibration are increased and the bearing is severely worn when the motor is rotated at a high speed.

This occurs because the housing cover 14 is not coupled to the housing 11 in a standard position. In other words, the diameter of the coupling hole formed in the housing 11 is formed to be larger than the diameter of the coupling member inserted into the coupling hole, and a dimensional tolerance is generated, and this phenomenon occurs when the center of the housing cover 14 is shifted from the center of the housing 11 in the radial direction of the housing 11 and coupled thereto.

Fig. 4 is an exploded perspective view of a housing and a housing cover constituting a motor according to an embodiment of the present invention, viewed from above, fig. 5 is an exploded perspective view of the housing and the housing cover, viewed from below, and fig. 6 is a longitudinal sectional view taken along line II-II of fig. 4 in a state where the housing cover and the housing are combined.

Referring to fig. 4 to 6, a housing cover 14 of the embodiment of the present invention is combined with an upper surface of the housing 11.

In detail, the housing cover 14 supports the upper bearing 135, and the housing 11 supports the lower bearing 133. Thus, the degree of alignment (alignment) of the bearings 133, 135 is determined according to how the housing cover 14 is coupled to the housing 11.

In more detail, the housing 11 includes: a housing 111; a housing cover mounting part 112 bent from an upper end (or a front end) of the housing 111; and a sleeve 113 bent again from an end of the housing cover mounting part 112.

The housing 111 may include: a rounded bottom 111 a; and a cylindrical side surface portion 111b extending upward (or forward) from an outer edge of the bottom portion 111 a. A plurality of air discharge ports 111c and 111d may be formed in the bottom portion 111a and the side surface portion 111b, respectively, and the air sucked through the air suction port 171 of the impeller cover 17 may be discharged to the outside of the motor 10 through the air discharge ports 111c and 111 d.

In addition, the lower bearing receiving portion 114 may be formed to protrude at the center of the upper surface (or the front surface) of the bottom portion 111 a. In detail, the lower bearing receiving portion 114 may be raised in a boss shape from the bottom portion 111a toward an upper side. The bearing receiving groove 114a may be formed by being recessed to a predetermined depth inside the lower bearing receiving portion 114. The lower bearing 133 is mounted to the bearing receiving groove 114 a.

The plurality of air discharge ports 111c may be arranged along the edge of the lower bearing housing portion 114 at intervals in the circumferential direction of the bottom portion 111 a.

Further, the side surface portion 111b may be formed with a plurality of air guide grooves 111 e. The air guide groove 111e may be formed in an arc shape recessed with a predetermined curvature toward the outside of the side surface portion 111b, that is, the radial direction of the side surface portion 111 b. The radius of curvature of the air guide groove 111e may be formed smaller than the radius of the side surface 111 b. As shown in the drawing, the plurality of air guide grooves 111e are formed at equal intervals in the circumferential direction of the side surface portion 111 b. In the present embodiment, the case where three air guide grooves 111e are formed is shown, but not limited thereto.

The plurality of air outlets 111d may be disposed at predetermined intervals in the circumferential direction of the side surface portion 111 b.

The housing cover attachment portion 112 may be formed by bending an upper end (or a front end) of the side surface portion 111b in a direction perpendicular to the side surface portion 111b, that is, in a radial direction of the side surface portion 111 b. A plurality of coupling holes 112a may be formed in the housing cover mounting portion 112.

The sleeve 113 may be formed in a cylindrical shape extending from an end of the housing cover mounting portion 112, and the sleeve 113 may be bent toward the bottom portion 111 a. When the impeller cover 17 is coupled to the housing 11, the outer peripheral surface of the sleeve 113 is in close contact with the inner peripheral surface of the lower end of the impeller cover 17 (see fig. 3). As a result, the impeller cover 17 can be prevented from swinging in a direction perpendicular to the rotary shaft 131.

In addition, the housing cover 14 may include: a disk-shaped cover body 141 having an opening formed on the inner side thereof; an upper bearing housing 142 located at the center of the opening; and a connecting arm 144 for connecting the upper bearing receiving portion 142 to an edge of the opening, i.e., an inner edge of the housing cover 14.

More specifically, a plurality of outer coupling holes 141a may be formed at positions spaced apart from each other by a predetermined interval in the circumferential direction of the cover main body 141, and three outer coupling holes 141a may be formed, for example, but the present invention is not limited thereto. The coupling member penetrating the outer coupling hole 141a is inserted into the coupling hole 112a formed in the case cover seating portion 112.

In addition, the upper bearing receiving portion 142 may be formed in an n-shaped longitudinal sectional shape such that a bearing receiving groove 141a for receiving the upper bearing 135 is formed therein. A shaft through hole 142b is formed in an upper surface of the upper bearing receiving portion 142, and the rotary shaft 131 is inserted into the center of the impeller 16 through the shaft through hole 142 b.

Further, one end portions of the plurality of connection arms 144 are connected to a side surface of the upper bearing receiving portion 142, and an inner connection hole 144a may be formed at each of the plurality of connection arms 144. A coupling member that penetrates the coupling hole 153 (see fig. 2) of the deflector 15 may be inserted into the inner coupling hole 144 a. The centers of the shaft through hole 142b, the inner coupling hole 144a, and the outer coupling hole 141a may be aligned with each other.

In addition, a guide rib 145 may be formed extending at an inner edge of the cover main body 141. In detail, the guide rib 145 may extend a predetermined length in a direction perpendicular to a radial direction of the cover body 141 at an inner edge of the cover body 141. Also, the guide rib 145 may be formed along an inner side edge of the cover main body 141. Also, the other end of the connecting arm 144 may be connected to the guide rib 145.

Further, a plurality of air guide grooves 141b depressed to a predetermined depth toward the outer edge of the cover main body 141 may be formed at the inner edge of the cover main body 141. When the housing cover 14 is coupled to the housing 11, the plurality of air guide grooves 141b are aligned with the plurality of air guide grooves 111e formed in the housing 11. Accordingly, the curvature of the plurality of air guide grooves 141b may be the same as the curvature of the plurality of air guide grooves 111 e.

In addition, the plurality of air guide grooves 141b may be formed along the inner edge of the cover main body 141 at the same interval in the circumferential direction. Also, the guide rib 145 may be formed along an inner edge of the cover main body 141 except for a portion where the air guide groove 141b is formed. That is, each of the guide ribs 145 may be defined to be formed between adjacent two air guide grooves 141 b.

However, it is not excluded that the guide rib 145 is further formed at a portion where the air guide groove 141b is formed. That is, the guide rib 145 may be formed in a circular sleeve shape along an inner edge of the cover main body 141.

The guide rib 145 may have the same outer diameter as the inner diameter of the side surface 111b of the housing 111. Thus, when the housing cover 14 is coupled to the housing 11, the outer peripheral surface of the guide rib 145 contacts the inner peripheral surface of the side surface 111 b.

In detail, when the housing cover 14 is coupled to the housing 11, there is a difference between the diameter of the outer coupling hole 141a and/or the coupling hole 112a and the outer diameter of the coupling member inserted into the coupling holes 141a and 112a, and thus there is a possibility that a dimensional tolerance may be generated.

Due to the dimensional tolerance, when the housing cover 14 is rotated in the circumferential direction of the housing 11, a phenomenon in which the coupling position is shifted may occur. However, even if the housing cover 14 is rotated in the circumferential direction of the housing 11 to shift the coupling position, the centers of the upper bearing 135 and the lower bearing 133 can be kept aligned with each other. Thus, it can be said that rotation of the housing cover 14 under the influence of dimensional tolerances does not affect the alignment of the bearings either.

In contrast, when the housing cover 14 is coupled to the housing 11, the housing cover 14 is shifted in the radial direction of the housing 11 due to the dimensional tolerance, and thus the upper bearing 135 may not be aligned with the lower bearing 133. That is, the center of the upper bearing 135 may be eccentric in the radial direction of the housing 11.

However, in the case of the present invention, since the outer peripheral surface of the guide rib 145 is in close contact with the inner peripheral surface of the side surface portion 111b, it is possible to prevent the upper bearing 135 from being eccentric by the movement of the housing cover 14 in the radial direction of the housing 11.