WO2016011774A1

WO2016011774A1 - Floor brush assembly for dust collector, motor transmission belt, motor shaft, and dust collector

Info

Publication number: WO2016011774A1
Application number: PCT/CN2014/095023
Authority: WO
Inventors: 肖峡湖; 张祺
Original assignee: 江苏美的清洁电器股份有限公司
Priority date: 2014-07-25
Filing date: 2014-12-25
Publication date: 2016-01-28

Abstract

A floor brush assembly (1) for a dust collector comprises a floor brush (40), a motor, and a belt. The floor brush (40) is provided with a belt wheel (20). The belt wheel (20) drives the floor brush (40) to rotate. The motor is adjacent to the floor brush (40) and is provided with a motor shaft (10). The belt (30) comprises a belt body (32). The belt body (32) is annular and is wound on the motor shaft (10) and the belt wheel (20). A heat dissipation groove (31) is provided on at least one of surfaces of the belt body (32) and the motor shaft (10) where they are combined. Also disclosed are the motor transmission belt (30), the motor shaft (10), and the dust collector.

Description

Ground brush assembly for vacuum cleaner, motor drive belt, motor shaft and vacuum cleaner

Technical field

The present invention relates to the field of electrical appliance manufacturing technology, and in particular to a ground brush assembly for a vacuum cleaner, a ground brush assembly for the vacuum cleaner, a motor drive belt for a vacuum cleaner, and a motor shaft for a vacuum cleaner.

Background technique

In the vacuum cleaner of the related art, the transmission belt in the ground brush is wound around the motor shaft and the pulley, and the heat generated by friction between the transmission belt and the motor shaft may affect the service life of the transmission belt or even blow the transmission belt.

Summary of the invention

The present invention aims to solve at least one of the above technical problems in the related art to some extent. To this end, the present invention provides a ground brush assembly for a vacuum cleaner, which has the advantages of good heat dissipation effect, long service life, and reliable transmission performance.

The invention also proposes a vacuum cleaner having the ground brush assembly for a vacuum cleaner.

The invention also proposes a motor drive belt for a vacuum cleaner which has the advantages of long service life and reliable transmission performance.

The present invention also proposes a motor shaft capable of increasing the service life of a motor drive belt wound thereon.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a ground brush assembly for a vacuum cleaner, the ground brush assembly for a vacuum cleaner comprising: a ground brush, the ground brush being provided with a pulley, The pulley drives the ground brush to rotate; the motor is disposed adjacent to the ground brush, the motor has a motor shaft; the belt includes a belt body, the belt body is annular, and the belt body Winding on the motor shaft and the pulley, at least one of the combined surfaces of the belt body and the motor shaft is provided with a heat dissipation groove.

The ground brush assembly for a vacuum cleaner according to an embodiment of the present invention has the advantages of good heat dissipation effect, long service life, and reliable transmission performance.

In addition, the floor brush assembly for a vacuum cleaner according to the above embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the invention, the heat dissipation groove is provided on an inner circumferential surface of the belt body.

According to an embodiment of the invention, the heat sink is an annular groove extending in a circumferential direction of the belt body.

According to an embodiment of the invention, the heat dissipating groove has a rectangular, trapezoidal, curved or waist-shaped cross section.

According to an embodiment of the invention, the heat dissipation grooves are plural and spaced apart along the width direction of the belt body.

According to an embodiment of the invention, the heat sink has a maximum depth of 0.2-1 mm, and the heat sink has a groove width of 0.3-1 mm along the width direction of the belt body.

According to an embodiment of the present invention, a plurality of the heat dissipation grooves are arranged in parallel and equally spaced along a width direction of the belt body, and a groove pitch of the heat dissipation groove along the width direction of the belt body is 1-3 mm. .

According to an embodiment of the invention, the heat dissipation groove is provided on an outer circumferential surface of the motor shaft.

According to an embodiment of the invention, the heat sink is an annular groove extending in a circumferential direction of the motor shaft.

According to an embodiment of the invention, the heat dissipation slots are plural and spaced apart along the axial direction of the motor shaft.

According to an embodiment of the invention, the heat sink has a maximum depth of 0.2-1 mm, and the heat sink has a groove width of 0.3-1 mm along the axial direction of the motor shaft.

According to an embodiment of the present invention, a plurality of the heat dissipation grooves are disposed in parallel and equidistantly disposed along the axial direction of the motor shaft, and a groove pitch of the heat dissipation groove along the axial direction of the motor shaft It is 1-3mm.

According to an embodiment of the invention, a surface of the motor shaft that is coupled to the belt body is a cylindrical surface; and a portion of the pulley that is coupled to the belt body is a cylindrical surface.

According to an embodiment of the present invention, a belt winding groove is provided on an outer circumferential surface of the motor shaft, and the belt body is wound in the belt winding groove.

According to an embodiment of the invention, the belt winding groove is disposed adjacent to an outer end of the motor shaft, and an end surface of the belt winding groove adjacent to an outer end of the motor shaft is open.

An embodiment according to a second aspect of the present invention provides a vacuum cleaner comprising a floor brush assembly for a vacuum cleaner according to an embodiment of the first aspect of the present invention.

The vacuum cleaner according to an embodiment of the present invention has the advantages of long service life, reliable performance, and the like.

According to a third aspect of the invention, a motor drive belt for a vacuum cleaner is provided, the motor drive belt for a vacuum cleaner comprising: a belt body, the belt body is annular, and an inner circumferential surface of the belt body is provided a heat dissipation groove extending along a circumferential direction of the belt body.

A motor drive belt for a vacuum cleaner according to an embodiment of the present invention has advantages such as long service life and reliable transmission performance.

According to an embodiment of the fourth aspect of the present invention, a motor shaft for a vacuum cleaner is provided, and a heat dissipation groove is provided on an outer circumferential surface of the motor shaft, and the heat dissipation groove extends in a circumferential direction of the motor shaft.

A motor shaft for a vacuum cleaner according to an embodiment of the present invention can increase the service life of a motor drive belt wound thereon.

DRAWINGS

1 is a schematic structural view of a floor brush assembly for a vacuum cleaner according to an embodiment of the present invention.

2 is a side view of a floor brush assembly for a vacuum cleaner in accordance with an embodiment of the present invention.

3 is a structural schematic view of a motor drive belt for a ground brush assembly of a vacuum cleaner in accordance with an embodiment of the present invention.

4 is a cross-sectional view of a motor drive belt for a ground brush assembly of a vacuum cleaner in accordance with an embodiment of the present invention.

Fig. 5 is a partially enlarged schematic view of Fig. 4;

6 is a schematic structural view of a motor shaft of a ground brush assembly for a vacuum cleaner according to an embodiment of the present invention.

Fig. 7 is a partially enlarged schematic view of Fig. 6.

Reference numerals: a ground brush assembly 1 for a vacuum cleaner, a motor shaft 10, a belt winding groove 11, a pulley 20, a belt 30, a heat dissipation groove 31, a belt body 32, and a ground brush 40.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A ground brush assembly 1 for a vacuum cleaner according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 7, a ground brush assembly 1 for a vacuum cleaner according to an embodiment of the present invention includes a ground brush 40, a motor, and a belt 30.

The ground brush 40 is provided with a pulley 20, and the pulley 20 drives the brush 40 to rotate. The motor is disposed adjacent to the ground brush 40. The belt 30 includes a belt body 32. The belt body 32 is annular. The belt body 32 is wound around the motor shaft 10 and the pulley 20. When the motor shaft 10 of the motor rotates, the pulley 20 is rotated by the belt 30, so that the pulley 20 is driven to rotate. 40 rotation for surface cleaning work. Wherein, at least one of the combined surfaces of the belt body 32 and the motor shaft 10 is provided with a heat dissipation groove 31. In other words, at least one of the surface of the belt body 32 that is coupled to the motor shaft 10 and the surface of the motor shaft 10 that is coupled to the belt body 32 is provided with a heat dissipation groove 31. Specifically, the heat dissipation groove 31 is provided on a surface of the belt body 32 that is coupled to the motor shaft 10, or the heat dissipation groove 31 may be provided on a surface of the motor shaft 10 that is coupled to the belt body 32, or the motor shaft 10 of the belt body 32. The combined surface and the surface of the motor shaft 10 that is coupled to the belt body 32 are provided with heat dissipation grooves 31.

The ground brush assembly 1 for a vacuum cleaner according to an embodiment of the present invention is provided with a heat dissipating groove 31 on one of the combined surfaces of the belt main body 32 and the motor shaft 10 such that the belt main body 32 is wound around the motor shaft 10, The heat dissipation area of the belt body 32 in contact with the motor shaft 10 can be increased, and the air in the heat dissipation groove 31 is located between the belt body 32 and the motor shaft 10, and the air in the heat dissipation groove 31 is used for heat insulation to reduce transmission. The heat to the belt body 32 can thereby greatly increase the service life of the belt 30, and prevent the belt 30 from being blown by the heat generated by the friction to ensure the reliability of the transmission performance of the belt 30. Therefore, the ground brush assembly 1 for a vacuum cleaner according to an embodiment of the present invention has the advantages of good heat dissipation effect, long service life, and reliable transmission performance.

A ground brush assembly 1 for a vacuum cleaner according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

The surface of the motor shaft 10 coupled to the belt body 32 is a cylindrical surface, and the portion of the pulley 20 that is coupled to the belt body 32 is a cylindrical surface. When the motor shaft 10 rotates, the belt body 32 moves by the sliding friction between the motor shaft 10 and the belt body 32, and the belt body 32 drives the pulley 20 to rotate by the sliding friction force of the belt body 32 and the pulley 20 bracket.

Further, a belt winding groove 11 is provided on the outer peripheral surface of the motor shaft 10, and the belt body 32 is wound in the belt winding groove 11. Thereby, the belt body 32 can be axially positioned by the belt winding groove 11 to prevent the belt body 32 from being tilted in the axial direction of the motor shaft 10.

Alternatively, the belt winding groove 11 is disposed adjacent to the outer end of the motor shaft 10, and the end surface of the belt winding groove 11 adjacent to the outer end of the motor shaft 10 is open. In this way, the belt winding groove 11 can be easily exposed to facilitate the winding of the belt body 32, and the installation and disassembly of the belt body 32 can be facilitated.

It will be understood by those skilled in the art that the outer end of the motor shaft 10 means that the motor shaft 10 extends from one end of the motor casing.

In some specific examples of the present invention, as shown in FIGS. 3 to 5, the heat dissipation grooves 31 are provided on the inner circumferential surface of the belt body 32, and the heat dissipation grooves 31 are annular grooves extending in the circumferential direction of the belt body 32. This can improve the uniformity of heat dissipation of the heat sinks 31 to the respective portions of the belt body 32 that are in contact with the motor shaft 10.

Alternatively, as shown in FIGS. 4 and 5, the heat dissipating groove 31 has a rectangular, trapezoidal, curved or waist-shaped cross section. Thereby, the processing of the heat sink 31 can be facilitated, and the heat insulation effect of the air in the heat sink 31 can be improved.

In some specific examples of the present invention, as shown in FIGS. 4 and 5, a plurality of heat dissipation grooves 31 are provided, and a plurality of heat dissipation grooves 31 are spaced apart along the width direction of the belt body 32 (the width direction of the belt body 32 is as shown in FIG. 4 and the arrow A in FIG. 5), the heat dissipation of the belt body 32 by the plurality of heat dissipation grooves 31 can improve the heat dissipation effect of the belt body 32 and further improve the service life of the belt 30.

Specifically, the maximum depth of the heat dissipation groove 31 is 0.2 to 1 mm, and the groove width of the heat dissipation groove 31 along the width direction of the belt main body 32 is 0.3 to 1 mm. The inventors of the present application have conducted a large number of tests, and by analyzing and calculating the test structure, it is found that the size of the heat dissipating groove 31 is set in this range, and not only the belt body 32 has a sufficiently large heat dissipating area, but also the heat dissipating groove 31 can be accommodated. A sufficient amount of air is provided to ensure the heat dissipation and heat insulation effect on the belt body 32, and the contact area between the belt body 32 and the motor shaft is ensured to ensure the reliability of the transmission. In addition, the amount of lubricating oil entering the heat dissipating groove 31 can be adjusted to achieve a good lubricating effect without affecting the transmission between the belt body 32 and the motor shaft 10, thereby avoiding waste of lubricating oil.

Preferably, the maximum depth of the heat dissipation groove 31 is 0.4 mm, and the heat dissipation groove 31 is along the width direction of the belt body 32. The groove width is 0.8 mm.

In order to ensure the uniformity of heat dissipation of the plurality of heat dissipating grooves 31 to the belt body 32, the plurality of heat dissipating grooves 31 may be disposed in parallel and equally spaced along the width direction of the belt body 32, and the heat dissipating grooves 31 may be grooved along the width direction of the belt main body 32. The spacing is 1-3mm. That is, the distance between the adjacent two heat dissipation grooves 31 in the width direction of the belt body 32 is 1-3 mm. In this way, the heat dissipation and heat insulation effects of the plurality of heat dissipation slots 31 on the belt body 32 can be ensured, and the motor shaft 10 engaged with the belt body 32 can stably drive the belt body 32 to move.

Preferably, the groove pitch of the heat dissipation groove 31 along the width direction of the belt body 32 is 2 mm.

In another specific example of the present invention, as shown in FIGS. 6 and 7, the heat dissipation groove 31 is provided on the outer circumferential surface of the motor shaft 10 and on the bottom wall of the belt winding groove 11, and the heat dissipation groove 31 is along the motor shaft 10. a circumferentially extending annular groove. This can improve the uniformity of heat dissipation of the heat sinks 31 to the respective portions of the belt body 32 that are in contact with the motor shaft 10.

Alternatively, as shown in FIGS. 6 and 7, the heat dissipating groove 31 has a rectangular, trapezoidal, curved or waist-shaped cross section. Thereby, the processing of the heat sink 31 can be facilitated, and the heat insulation effect of the air in the heat sink 31 can be improved.

In some specific examples of the present invention, as shown in FIG. 6 and FIG. 7, a plurality of heat dissipation slots 31 are provided, and a plurality of heat dissipation slots 31 are spaced apart along the axial direction of the motor shaft 10, and the plurality of heat dissipation slots 31 are used for the belt. The heat dissipation of the body 32 can improve the heat dissipation effect of the belt body 32 and further improve the service life of the belt 30.

Specifically, the maximum depth of the heat dissipation groove 31 is 0.2 to 1 mm, and the groove width of the heat dissipation groove 31 along the axial direction of the motor shaft 10 is 0.3 to 1 mm. The inventors of the present application have conducted a large number of tests, and by analyzing and calculating the test structure, it is found that the size of the heat dissipating groove 31 is set in this range, and not only the belt body 32 has a sufficiently large heat dissipating area, but also the heat dissipating groove 31 can be accommodated. A sufficient amount of air is provided to ensure the heat dissipation and heat insulation effect on the belt body 32, and the contact area between the belt body 32 and the motor shaft is ensured to ensure the reliability of the transmission. In addition, the amount of lubricating oil entering the heat dissipating groove 31 can be adjusted to achieve a good lubricating effect without affecting the transmission between the belt body 32 and the motor shaft 10, thereby avoiding waste of lubricating oil.

Preferably, the maximum depth of the heat sink 31 is 0.4 mm, and the groove width of the heat sink 31 along the axial direction of the motor shaft 10 is 0.8 mm.

In order to ensure the uniformity of heat dissipation of the plurality of heat dissipating grooves 31 to the belt body 32, the plurality of heat dissipating grooves 31 may be disposed in parallel and equidistantly along the axial direction of the motor shaft 10, and the heat dissipating grooves 31 are along the axial direction of the motor shaft 10. The groove pitch in the direction is 1-3 mm. That is, the distance between the adjacent two heat sinks 31 in the axial direction of the motor shaft 10 is 1-3 mm. In this way, the heat dissipation and heat insulation effects of the plurality of heat dissipation slots 31 on the belt body 32 can be ensured, and the motor shaft 10 engaged with the belt body 32 can stably drive the belt body 32 to move.

Preferably, the groove pitch of the heat dissipation groove 31 along the axial direction of the motor shaft 10 is 2 mm.

Other configurations and operations of the floor brush assembly 1 for a vacuum cleaner in accordance with embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

A vacuum cleaner according to an embodiment of the present invention is described below. A vacuum cleaner according to an embodiment of the present invention includes a ground brush assembly 1 for a vacuum cleaner according to the above embodiment of the present invention.

The vacuum cleaner according to the embodiment of the present invention has advantages such as long service life, reliable performance, and the like by using the ground brush assembly 1 for a vacuum cleaner according to the above-described embodiment of the present invention.

Other configuration examples and operations of the vacuum cleaner according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

A motor drive belt 30 for a vacuum cleaner according to an embodiment of the present invention is described below.

As shown in FIG. 3 to FIG. 5, the motor drive belt 30 for a vacuum cleaner according to an embodiment of the present invention includes a belt body 32. The belt body 32 is annular, and the inner circumferential surface of the belt body 32 is provided with a heat dissipation groove 31. 31 extends in the circumferential direction of the belt body 32.

The motor drive belt 30 for a vacuum cleaner according to an embodiment of the present invention has the advantages of long service life, reliable transmission performance, and the like.

A motor shaft 10 for a vacuum cleaner according to an embodiment of the present invention will be described below.

As shown in FIG. 6 and FIG. 7, the outer peripheral surface of the motor shaft 10 for a vacuum cleaner according to an embodiment of the present invention is provided with a heat dissipating groove 31 which extends in the circumferential direction of the motor shaft 10.

The motor shaft 10 for a vacuum cleaner according to an embodiment of the present invention can improve the service life of a motor drive belt wound thereon.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position of indications such as "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplification of the description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and thus It is not to be understood as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature is "on" or "below" the second feature, unless otherwise explicitly stated and defined. The first and second features may be included in direct contact, and the first and second features may be included not in direct contact but through additional feature contact therebetween. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Further, various embodiments or examples described in the specification may be combined and combined by those skilled in the art.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A ground brush assembly for a vacuum cleaner, comprising:

a ground brush, the ground brush is provided with a pulley, and the pulley drives the ground brush to rotate;

a motor, the motor being disposed adjacent to the ground brush, the motor having a motor shaft;

a belt comprising a belt body, the belt body being annular, the belt body being wound on the motor shaft and the pulley, at least one of a combined surface of the belt body and the motor shaft There is a heat sink on the top.
A floor brush assembly for a vacuum cleaner according to claim 1, wherein said heat dissipation groove is provided on an inner circumferential surface of said belt body.
A floor brush assembly for a vacuum cleaner according to claim 2, wherein said heat dissipating groove is an annular groove extending in a circumferential direction of said belt body.
The floor brush assembly for a vacuum cleaner according to claim 3, wherein the heat dissipating groove has a rectangular, trapezoidal, curved or waist-shaped cross section.
A floor brush assembly for a vacuum cleaner according to claim 2, wherein said plurality of heat dissipation grooves are provided in plurality and spaced apart in the width direction of said belt body.
The floor brush assembly for a vacuum cleaner according to claim 5, wherein the heat sink has a maximum depth of 0.2-1 mm, and the groove width of the heat sink along the width direction of the belt body is 0.3-1mm.
A floor brush assembly for a vacuum cleaner according to claim 6, wherein a plurality of said heat dissipating grooves are arranged in parallel and equally spaced along a width direction of said belt body, said heat dissipating grooves being along said belt body The groove pitch in the width direction is 1-3 mm.
[Correct according to Rule 26 03.02.2015]
A floor brush assembly for a vacuum cleaner according to claim 1, wherein said heat dissipation groove is provided on an outer peripheral surface of said motor shaft.
[Correct according to Rule 26 03.02.2015]
A floor brush assembly for a vacuum cleaner according to claim 9, wherein said heat dissipating groove is an annular groove extending in a circumferential direction of said motor shaft.
[Correct according to Rule 26 03.02.2015]
The floor brush assembly for a vacuum cleaner according to claim 10, wherein the heat dissipating groove has a rectangular, trapezoidal, curved or waist-shaped cross section.
[Correct according to Rule 26 03.02.2015]
A floor brush assembly for a vacuum cleaner according to claim 9, wherein said plurality of heat dissipation grooves are provided in plurality and spaced apart in the axial direction of said motor shaft.
[Correct according to Rule 26 03.02.2015]
The ground brush assembly for a vacuum cleaner according to claim 12, wherein the heat sink has a maximum depth of 0.2-1 mm, and a groove width of the heat sink along the axial direction of the motor shaft It is 0.3-1mm.
[Correct according to Rule 26 03.02.2015]
A floor brush assembly for a vacuum cleaner according to claim 13, wherein a plurality of said heat dissipation grooves are arranged in parallel and equidistantly disposed in said axial direction of said motor shaft, said heat dissipation grooves being along said The groove pitch of the motor shaft in the axial direction is 1-3 mm.
[Correct according to Rule 26 03.02.2015]

A ground brush assembly for a vacuum cleaner according to any one of claims 1 to 14, wherein a surface of the motor shaft that is coupled to the belt body is a cylindrical surface;

A portion of the pulley that is coupled to the belt body is a cylindrical surface.
[Correct according to Rule 26 03.02.2015]
A ground brush assembly for a vacuum cleaner according to any one of claims 1 to 14, wherein a belt winding groove is provided on an outer peripheral surface of the motor shaft, and the belt body is wound around the belt winding groove. Inside.
[Correct according to Rule 26 03.02.2015]
A floor brush assembly for a vacuum cleaner according to claim 16, wherein said belt winding groove is disposed adjacent to an outer end of said motor shaft, and an end surface of said belt winding groove adjacent to an outer end of said motor shaft Open.
[Correct according to Rule 26 03.02.2015]
A vacuum cleaner characterized by comprising a floor brush assembly for a vacuum cleaner according to any one of claims 1-17.
[Correct according to Rule 26 03.02.2015]

A motor drive belt for a vacuum cleaner, comprising:

In the belt body, the belt body is annular, and an inner circumferential surface of the belt body is provided with a heat dissipation groove, and the heat dissipation groove extends along a circumferential direction of the belt body.
[Correct according to Rule 26 03.02.2015]
A motor shaft for a vacuum cleaner, characterized in that a heat dissipating groove is provided on an outer circumferential surface of the motor shaft, and the heat dissipating groove extends in a circumferential direction of the motor shaft.