Suction port body for vacuum cleaner, vacuum cleaner, and suction port structure for self-propelled vacuum cleaner

Abstract

To provide a suction port body for a vacuum cleaner that has high-silent property, and to provide a vacuum cleaner and a suction port structure for a self-propelled vacuum cleaner.SOLUTION: A suction port body for a vacuum cleaner includes: a rotary brush having an outer peripheral surface and rotating about a shaft; and a housing for defining a rotary brush chamber in which the rotary brush is disposed and which includes an opposite wall opposite to the outer peripheral surface. The opposite wall includes: a proximity-most part in most proximity to the shaft; and a silencer structure disposed backward of the proximity-most part and disposed in a range where the rotary brush chamber is present in a direction parallel to the shaft.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a suction port body of a vacuum cleaner, a vacuum cleaner, and a suction port structure of a self-propelled vacuum cleaner. [Background technology]

[0002] Patent Document 1 discloses a suction port body of an electric vacuum cleaner. In the suction port body, a ceiling is provided at a height that is close enough to the outer periphery of a rotating brush without being caught. The space above the ceiling becomes an expansion chamber. A number of small holes are formed in the ceiling. The suction port and the expansion chamber communicate with each other through the small holes. Sound waves generated in the suction port body are introduced into the expansion chamber through the small holes. A certain percentage of the sound waves are annihilated due to sound wave interference in the expansion chamber. This reduces the level of noise leaking to the outside. The small holes are formed near both ends of the rotating brush in the width direction, and are not formed near the center of the rotating brush in the width direction (paragraphs 0017, 0027, and 0028 and FIG. 10). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-63114 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the suction mouth of the vacuum cleaner disclosed in Patent Document 1, sound waves generated near the center of the width of the rotating brush cannot be sufficiently introduced into the expansion chamber, and therefore the level of noise leaking to the outside is not sufficiently reduced in the suction mouth.

[0005] In view of this problem, an aspect of the present disclosure has been made. An object of the present disclosure is to provide, for example, a suction port body of a vacuum cleaner, a suction port structure of a vacuum cleaner, and a suction port structure of a self-propelled vacuum cleaner that are highly quiet. [Means for solving the problem]

[0006] The suction head body of a vacuum cleaner in a first aspect of the present disclosure comprises a rotating brush having an outer peripheral surface and rotating around an axis, and a housing defining a rotating brush chamber in which the rotating brush is arranged and comprising an opposing wall facing the outer peripheral surface, the opposing wall comprising a closest part closest to the axis and a sound-absorbing structure arranged behind the closest part and within the range in which the rotating brush chamber is located in a direction parallel to the axis.

[0007] A vacuum cleaner according to a second aspect of the present disclosure includes the suction mouth body of the vacuum cleaner according to the first aspect of the present disclosure, and a suction section that sucks in dust and dirt through the suction mouth body.

[0008] The suction port structure of a self-propelled vacuum cleaner of the third aspect of the present disclosure comprises a rotating brush having an outer peripheral surface and rotating around an axis, and a housing defining a rotating brush chamber in which the rotating brush is arranged and comprising an opposing wall facing the outer peripheral surface, the opposing wall comprising a closest part closest to the axis and a sound-absorbing structure arranged behind the closest part and within the range in which the rotating brush chamber is located in a direction parallel to the axis. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view illustrating a vacuum cleaner according to a first embodiment. [Diagram 2] 1 is a perspective view showing a schematic view of a suction mouth body provided in a vacuum cleaner of a first embodiment, as viewed from above and on the front left; [Diagram 3] 1 is a perspective view showing a schematic view of a suction port body provided in a vacuum cleaner of a first embodiment, as viewed from below and on the front right side; [Figure 4] 1 is a cross-sectional view that diagrammatically illustrates a cross section perpendicular to the left-right direction of a suction inlet body provided in a vacuum cleaner of a first embodiment. [Diagram 5] 1 is an exploded perspective view showing a schematic view of a suction mouth body provided in a vacuum cleaner of a first embodiment, as viewed from below and front right; FIG. [Figure 6]1 is an exploded perspective view showing a schematic view of a suction inlet body provided in a vacuum cleaner of a first embodiment, as viewed from above and rear on the right side; [Figure 7] 2 is a perspective view showing a schematic diagram of a rotating brush, a brush motor, and a belt of a suction mouth body provided in the vacuum cleaner of the first embodiment. FIG. [Figure 8] 1 is a cross-sectional view that diagrammatically illustrates a cross section perpendicular to the left-right direction of a rotating brush of a suction mouth body provided in a vacuum cleaner of a first embodiment. [Figure 9] FIG. 2 is an exploded perspective view showing a schematic view of a rotating brush of a suction mouth body provided in the vacuum cleaner of the first embodiment, as viewed from above and on the front left. [Figure 10] 1 is a cross-sectional view that diagrammatically illustrates a cross section perpendicular to the front-rear direction of a suction inlet body provided in a vacuum cleaner of a first embodiment. [Figure 11] FIG. 11 is a perspective view illustrating a vacuum cleaner according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0011] 1. First embodiment 1.1 Vacuum cleaner FIG. 1 is a perspective view that diagrammatically illustrates a vacuum cleaner according to a first embodiment.

[0012] The vacuum cleaner 1 of the first embodiment shown in Fig. 1 is a stick type vacuum cleaner. The vacuum cleaner 1 may be a vacuum cleaner other than a stick type vacuum cleaner. For example, the vacuum cleaner 1 may be a canister type vacuum cleaner.

[0013] The vacuum cleaner 1 sweeps out dust on a surface to be cleaned, sucks in air and the swept-out dust, separates the dust from the sucked-in air, collects the separated dust, and expels the sucked-in air.

[0014] As shown in FIG. 1, the vacuum cleaner 1 includes a suction inlet body 11, an extension tube 12 and a suction unit 13.

[0015] The suction port body 11 is placed on the surface to be cleaned. The suction port body 11 scrapes out dust on the surface to be cleaned and sucks in air and the scraped out dust.

[0016] One end of the extension pipe 12 is connected to the suction port body 11. The other end of the extension pipe 12 is connected to the suction unit 13. The extension pipe 12 guides the sucked air and dust from the suction port body 11 to the suction unit 13.

[0017] The suction unit 13 generates an air flow necessary for the suction port body 11 to suck in air and dust, and for the extension tube 12 to guide the sucked air and dust. The suction unit 13 sucks in the guided air and dust, separates the sucked dust from the sucked air, collects the separated dust, and discharges the separated air. The suction unit 13 is connected to the suction port body 11 via the extension tube 12, and sucks in air and dust via the suction port body 11 and the extension tube 12.

[0018] The suction unit 13 can also be directly connected to the suction port body 11 without using the extension tube 12. When the suction unit 13 is directly connected to the suction port body 11, the suction port body 11 and the suction unit 13 form a handheld vacuum cleaner.

[0019] 1.2 Suction body Fig. 2 is a perspective view showing the suction mouth body of the vacuum cleaner of the first embodiment as viewed from the upper left front. Fig. 3 is a perspective view showing the suction mouth body of the vacuum cleaner of the first embodiment as viewed from the lower right front. In Fig. 3, the shape of the multiple brushes of the suction mouth body is simplified to a cylindrical shape.

[0020] 2 and 3, the suction port body 11 has a front direction D11, a rear direction D12, a left direction D21, a right direction D22, an upward direction D31, and a downward direction D32. The suction port body 11 has a relatively large size in the left-right direction parallel to the left direction D21 and the right direction D22, and a relatively small size in the front-back direction parallel to the front direction D11 and the rear direction D12. When the suction port body 11 is placed on a surface to be cleaned, it can be easily moved in the front-back direction.

[0021] As shown in FIGS. 2 and 3, the suction port body 11 includes a main body 21 and a connecting pipe 22.

[0022] The main body 21 is placed on the surface to be cleaned. The main body 21 scrapes out dust on the surface to be cleaned and sucks in air and the scraped out dust.

[0023] The connecting pipe 22 is connected to the center in the left-right direction on the rear side of the main body 21. The connecting pipe 22 guides the sucked air and dust from the main body 21 to the extension pipe 12.

[0024] 1.3 Suction port body As shown in FIGS. 2 and 3, the main body 21 includes a rotating brush 31 and a housing 32 .

[0025] When the suction port body 11 is placed on a surface to be cleaned, the rotating brush 31 comes into contact with the surface to be cleaned. The rotating brush 31 has a central axis 31p. The central axis 31p is parallel to the left-right direction. The rotating brush 31 has a radial direction D41, a circumferential direction D42, and an axial direction D43. The axial direction D43 is parallel to the central axis 31p and the left-right direction. The rotating brush 31 rotates in the circumferential direction D42 around the central axis 31p. This allows the rotating brush 31 to scrape off dust on the surface to be cleaned.

[0026] A rotating brush chamber 32a is formed in the housing 32. An opening 32b is formed in the housing 32. The rotating brush chamber 32a is exposed to the opening 32b. The housing 32 has a lower surface 32c. When the suction port body 11 is placed on the surface to be cleaned, the lower surface 32c faces the surface to be cleaned. The opening 32b is formed in the lower surface 32c. As a result, the opening 32b exposes the rotating brush chamber 32a to the lower surface 32c.

[0027] The rotating brush 31 is disposed in a rotating brush chamber 32a of the housing 32. A portion of the rotating brush 31 protrudes from the rotating brush chamber 32a and protrudes beyond the opening 32b of the housing 32 and from the bottom surface 32c of the housing 32. As a result, when the suction port body 11 is disposed on the surface to be cleaned, a portion of the rotating brush 31 comes into contact with the surface to be cleaned.

[0028] 1.4 Air duct of the suction port Fig. 4 is a cross-sectional view that illustrates a cross section perpendicular to the left-right direction of the suction mouth body provided in the vacuum cleaner of the first embodiment. In Fig. 4, the shape of the multiple brushes of the suction mouth body is simplified to a cylindrical shape.

[0029] As shown in FIG. 4, an air passage 32d is formed in the housing 32. An air passage 22a is formed in the connecting pipe 22. One end of the air passage 32d is connected to the center in the left-right direction on the rear side of the rotating brush chamber 32a of the housing 32. The other end of the air passage 32d is connected to one end of the air passage 22a. The other end of the air passage 22a is connected to one end of the air passage formed in the extension pipe 12. As a result, the rotating brush chamber 32a guides the sucked air and dust to the air passage 32d. The air passage 32d guides the guided air and dust to the air passage 22a. The air passage 22a guides the guided air and dust to the air passage formed in the extension pipe 12.

[0030] 1.5 Silencing of sounds generated in the rotating brush room Fig. 5 is an exploded perspective view of the suction mouth body of the vacuum cleaner of the first embodiment, as viewed from the right front lower side. In Fig. 5, the shape of the brushes of the suction mouth body is simplified to a cylindrical shape. Fig. 6 is an exploded perspective view of the suction mouth body of the vacuum cleaner of the first embodiment, as viewed from the right rear upper side.

[0031] 3 to 5, the rotating brush 31 includes a shaft body 41 and a plurality of brushes 42. The shaft body 41 has an outer circumferential surface 41a.

[0032] As shown in FIGS. 3 to 6, the housing 32 includes a lower portion 51 and an upper portion 52 .

[0033] A part of the lower portion 51 serves as a lower exterior of the housing 32. Another part of the lower portion 51 serves as a support structure that supports the rotating brush 31 and the brush motor 91.

[0034] The upper part 52 is disposed above the lower part 51 and constitutes an upper exterior of the housing 32. The upper part 52 is coupled to the lower part 51.

[0035] The housing 32 has an expansion chamber 32e formed therein.

[0036] The expansion chamber 32e of the housing 32 is formed above the rotating brush chamber 32a of the housing 32. The expansion chamber 32e is formed between the lower portion 51 and the upper portion 52.

[0037] As shown in FIGS. 3-6, the lower portion 51 includes opposing walls 61 and a side wall 62 .

[0038] The opposing wall 61 defines the rotating brush chamber 32a of the housing 32 in the radial direction D41. Therefore, the opposing wall 61 faces the outer circumferential surface 41a of the shaft body 41 of the rotating brush 31. The side wall 62 defines the rotating brush chamber 32a in the axial direction D43.

[0039] The opening 32b of the housing 32 has a front end 32f and a rear end 32g. The front end 32f and the rear end 32g are located in front of and behind the opening 32b, respectively. The opening 32b reaches the rear end 32g from the front end 32f through the lower part of the rotating brush 31. The facing wall 61 reaches the rear end 32g from the front end 32f through the upper part of the rotating brush 31. The facing wall 61 may be composed of a plurality of parts different from each other. For example, the part of the facing wall 61 from the front end 32f to the front end of the upper part 52 may be composed of a part different from the part constituting the remaining part of the facing wall 61. The part constituting the part from the front end 32f to the front end of the upper part 52 is, for example, a bumper that deforms and cushions the impact when the suction port body 11 hits a wall.

[0040] As shown in FIGS. 4 to 6, the opposing wall 61 includes a nearest portion 71 and a sound-absorbing structure 72 .

[0041] The closest portion 71 is the portion of the opposing wall 61 that is closest to the central axis 31p of the rotating brush 31. For this reason, the distance from the closest portion 71 of the opposing wall 61 to the rotating brush 31 is shorter than the distance from the portion of the opposing wall 61 other than the closest portion 71 to the rotating brush 31. For this reason, the gap between the closest portion 71 of the opposing wall 61 and the rotating brush 31 is less likely to allow air and dust to pass therethrough, and is less likely to allow sound generated in the rotating brush chamber 32a of the housing 32 to pass therethrough, compared to the gap between the portion of the opposing wall 61 other than the closest portion 71 and the rotating brush 31.

[0042] The closest part 71 is disposed above the rotating brush 31 and regulates the air passage from between the front end 32f of the opening 32b of the housing 32 and the rotating brush 31, passing above the rotating brush 31, to one end of the air passage 32d of the housing 32. However, the closest part 71 does not regulate the air passage from between the rear end 32g of the opening 32b of the housing 32 and the rotating brush 31 to one end of the air passage 32d without passing above the rotating brush 31. Therefore, most of the air and dust guided by the air passage 32d is guided from between the rear end 32g and the rotating brush 31 to one end of the air passage 32d without passing above the rotating brush 31, as shown by the arrows in FIG. 4. That is, the air passage necessary to give the suction port body 11 high suction performance is secured. This makes it possible to provide the suction port body 11 with high suction performance.

[0043] The closest part 71 is disposed above the rotating brush 31, and traps sound generated in a space behind the closest part 71, which forms part of the rotating brush chamber 32a of the housing 32, in a trapping space 32h that occupies part of the rotating brush chamber 32a and is behind the closest part 71. This makes it possible to prevent sound generated in the space from leaking out from between the front end 32f of the opening 32b of the housing 32 and the rotating brush 31.

[0044] The sound deadening structure 72 deadens at least a part of the sound generated in a space behind the closest part 71, which is a part of the rotating brush chamber 32a of the housing 32, to achieve noise reduction. The sound deadening structure 72 is disposed above the rotating brush 31 and behind the closest part 71. That is, the closest part 71 is disposed between the sound deadening structure 72 and the front end 32f of the opening 32b of the housing 32. As a result, the sound deadening structure 72 deadens at least a part of the sound trapped in the trapped space 32h to achieve noise reduction. As a result, the sound generated in the rotating brush chamber 32a can be effectively deadened. As a result, it is possible to provide an intake body 11 with high noise reduction properties.

[0045] The sound deadening structure 72 is disposed in the range in which the rotating brush chamber 32a of the housing 32 exists in the axial direction D43, and is preferably disposed over the entire range, thereby making it possible to effectively deaden the sound generated in the rotating brush chamber 32a.

[0046] As shown in FIG. 4 and FIG. 5, the facing wall 61 includes a first portion 81 disposed between the confinement space 32h of the housing 32 and the expansion chamber 32e of the housing 32. The first portion 81 includes a plurality of holes 81a. The plurality of holes 81a communicate with the confinement space 32h and the expansion chamber 32e, and guide the sound trapped in the confinement space 32h from the confinement space 32h to the expansion chamber 32e. The expansion chamber 32e cancels out the guided sounds and eliminates them. As a result, the plurality of holes 81a and the expansion chamber 32e constitute a sound-absorbing structure 72 that muffles the sound trapped in the confinement space 32h of the housing 32. The plurality of holes 81a serve as sound-absorbing openings in the sound-absorbing structure 72. The main body 21 may include a sound-absorbing material that fills the expansion chamber 32e, or a sound-absorbing material that is disposed in a part of the expansion chamber 32e.

[0047] Preferably, the distances from two-thirds or more of the holes 81a included in the plurality of holes 81a in the first portion 81 to the rotating brush 31 are set to be the same. This allows the plurality of holes 81a to evenly absorb sound generated in the rotating brush chamber 32a of the housing 32. The distance from a hole 81a near the center that is in communication with an air passage formed in the suction section 13 and included in the plurality of holes 81a to the rotating brush 31 may be longer than the distance from the remaining holes 81a included in the plurality of holes 81a to the rotating brush 31. This is because when the distance from the hole 81a near the center to the rotating brush 31 is longer than the distance from the remaining holes 81a to the rotating brush 31, sound generated in the suction section 13 can be effectively silenced.

[0048] The plurality of holes 81a of the first portion 81, which is the entirety of the holes constituting the two hole rows, includes two or more holes 81b constituting each of the hole rows included in the two hole rows.

[0049] The two or more holes 81b of the first portion 81 are distributed over the entire range in the axial direction D43 in which the rotating brush chamber 32a of the housing 32 exists, thereby making it possible to effectively muffle sound generated in the rotating brush chamber 32a.

[0050] The two or more holes 81b of the first portion 81 are arranged at equal intervals in the axial direction D43. This allows the two or more holes 81b to evenly absorb sound generated in the rotating brush chamber 32a of the housing 32.

[0051] The sound deadening structure 72 may be a sound deadening structure other than the sound deadening structure constituted by the plurality of holes 81 a of the first portion 81 and the expansion chamber 32 e of the housing 32 .

[0052] 1.6 Brushed motor cooling Fig. 7 is a perspective view showing a rotating brush, a brush motor, and a belt of the suction mouth body provided in the vacuum cleaner of the first embodiment. In Fig. 7, the shape of the multiple brushes of the rotating brush is simplified to a cylindrical shape.

[0053] As shown in FIGS. 6 and 7, the main body 21 includes a brush motor 91 and a belt 92 .

[0054] The brush motor 91 generates a driving force for rotating the rotating brush 31 .

[0055] The belt 92 transmits the generated driving force to the rotating brush 31 to rotate the rotating brush 31. In this way, the brush motor 91 rotates the rotating brush 31. The belt 92 may be replaced with another type of driving force transmission element. For example, the belt 92 may be replaced with a gear or the like.

[0056] In the housing 32, a brush motor chamber 32i is formed.

[0057] The brush motor chamber 32i of the housing 32 is formed behind the rotating brush chamber 32a of the housing 32. The brush motor chamber 32i is formed between the lower portion 51 and the upper portion 52.

[0058] The brush motor 91 is disposed in a brush motor chamber 32 i of the housing 32 .

[0059] As shown in Figs. 5 and 6, the opposing wall 61 has a second portion 82 disposed between the confined space 32h of the housing 32 and the brush motor chamber 32i of the housing 32. A plurality of holes 82a are formed in the second portion 82. A plurality of holes 52b are formed in the upper portion 52. The plurality of holes 82a communicate with the confined space 32h and the brush motor chamber 32i. The plurality of holes 52b communicate with the brush motor chamber 32i. Thus, air is guided to the confined space 32h through the plurality of holes 52b and the brush motor chamber 32i in sequence. The air passing through the brush motor chamber 32i cools the brush motor 91 disposed in the brush motor chamber 32i.

[0060] The multiple holes 82a of the second portion 82 are formed at a location rearward of the closest portion 71 and close to the air passage 32d of the housing 32. This allows air to be guided to the air passage 32d through the multiple holes 52b of the upper portion 52, the brush motor chamber 32i of the housing 32, and the confinement space 32h of the housing 32 in this order. This makes it possible to effectively cool the brush motor 91 arranged in the brush motor chamber 32i.

[0061] The multiple holes 82a of the second portion 82 are formed rearward of the sound deadening structure 72. This allows the position where the multiple holes 82a are formed and the position where the sound deadening structure 72 is disposed to be different from each other in the circumferential direction D42. This makes it possible to avoid a situation where the sound deadening structure 72 cannot be disposed at the position where the multiple holes 82a are formed in the axial direction D43. This allows the sound deadening structure 72 to be disposed over the entire range in which the rotating brush chamber 32a of the housing 32 exists in the axial direction D43.

[0062] 1.7 Rotating Brush FIG. 8 is a cross-sectional view that diagrammatically illustrates a cross section perpendicular to the left-right direction of the rotating brush of the suction mouth body provided in the vacuum cleaner of the first embodiment.

[0063] 8, the rotating brush 31 includes a shaft body 41 and a plurality of brushes 42. Each brush 42 included in the plurality of brushes 42 includes a base 101 and a plurality of bristles 102.

[0064] A groove 41b is formed along an axial direction D43 in the shaft body 41. The groove 41b is formed in an outer circumferential surface 41a of the shaft body 41. The groove 41b has a spiral shape.

[0065] The base portion 101 has a shape that fits into the shape of the groove 41b of the shaft body 41. The base portion 101 is housed in the groove 41b.

[0066] One end of each of the bristles 102 is connected to the base 101. Each bristles 102 protrudes from the groove 41b of the shaft body 41. This allows the bristles 102 to come into contact with the surface to be cleaned and scrape off dust on the surface to be cleaned.

[0067] The closest portion 71 is the portion of the opposing wall 61 that is closest to the central axis 31p of the rotating brush 31. For this reason, the closest portion 71 is the portion of the opposing wall 61 against which the multiple bristles 102 come into contact most strongly.

[0068] 1.8 Suppression of vibration of the rotating brush Fig. 9 is an exploded perspective view showing a rotating brush of the suction mouth body of the vacuum cleaner of the first embodiment as viewed from the upper left front. Fig. 10 is a cross-sectional view showing a cross section perpendicular to the front-rear direction of the suction mouth body of the vacuum cleaner of the first embodiment. In Figs. 9 and 10, the shape of the multiple brushes of the rotating brush is simplified to a cylindrical shape.

[0069] As shown in FIGS. 9 and 10, the rotating brush 31 includes a support part 111, a ball bearing 112, a rotating shaft part 113, and a tapping screw 114.

[0070] The shaft support part 111, the ball bearing 112, the rotating shaft part 113 and the shaft body 41 are arranged coaxially.

[0071] The pivot component 111 is detachably held by a holder provided in the housing 32 .

[0072] As shown in FIGS. 9 and 10, the bearing part 111 includes a flange portion 121 and a cylindrical portion 122 .

[0073] The flange portion 121 has a plate-like shape. The flange portion 121 spreads outward in the radial direction D41 from one end of the cylindrical portion 122. The flange portion 121 has a shape that fits the shape of a groove 32j formed in the housing 32. The flange portion 121 is fitted into the groove 32j. As a result, the pivot support part 111 is held in the housing 32.

[0074] The cylindrical portion 122 has a cylindrical shape. A first internal space 122a and a second internal space 122b are formed in the cylindrical portion 122. The cylindrical portion 122 has an inner circumferential surface 122c that defines the first internal space 122a and the second internal space 122b.

[0075] The cylindrical portion 122 , the first internal space 122 a of the cylindrical portion 122 , the second internal space 122 b of the cylindrical portion 122 , and the inner circumferential surface 122 c of the cylindrical portion 122 have a common central axis that coincides with the central axis 31 p of the rotating brush 31 .

[0076] Each of the first internal space 122a and the second internal space 122b of the cylindrical portion 122 has a cylindrical shape. One end of the first internal space 122a is at one end of the cylindrical portion 122. The other end of the first internal space 122a is connected to one end of the second internal space 122b. The other end of the second internal space 122b is at the other end of the cylindrical portion 122. The second internal space 122b has a diameter larger than the diameter of the first internal space 122a. Therefore, the inner peripheral surface 122c of the cylindrical portion 122 has a step at the axial direction D43 position where the boundary between the first internal space 122a and the second internal space 122b exists.

[0077] The ball bearing 112 is supported by the support part 111. As a result, the ball bearing 112 is supported by the housing 32 via the support part 111. The ball bearing 112 supports the rotating shaft part 113 so that the rotating shaft part 113 can rotate in the circumferential direction D42. As a result, the housing 32, the support part 111, and the ball bearing 112 configure a support structure that supports the rotating shaft part 113. The ball bearing 112 supports the rotating shaft part 113 so that the rotating shaft part 113 can rotate around the central axis 31p of the rotating brush 31.

[0078] 9 and 10, the ball bearing 112 includes an outer ring 131 and an inner ring 132. The inner ring 132 is formed with a shaft hole 132a.

[0079] The ball bearing 112, the outer ring 131, the inner ring 132 and the shaft hole 132a of the inner ring 132 have a common central axis that coincides with the central axis 31p of the rotating brush 31. The ball bearing 112 supports a rotating shaft part 113.

[0080] The outer ring 131 has an annular shape. The outer ring 131 has an outer diameter that fits the diameter of the second internal space 122b of the cylindrical portion 122. The outer ring 131 is fitted into the second internal space 122b. The outer ring 131 abuts against a step on the inner circumferential surface 122c of the cylindrical portion 122. As a result, the outer ring 131 is coupled to the support part 111. As a result, the outer ring 131 is supported by the support part 111.

[0081] The inner ring 132 has an annular shape. The inner ring 132 is disposed inside the outer ring 131 in the radial direction D41. The inner ring 132 can rotate in the circumferential direction D42 relative to the outer ring 131. This allows the inner ring 132 to rotate relative to the housing 32 and the shaft support component 111. The inner ring 132 rotates about the central axis of the rotating brush 31. An axial hole 132a of the inner ring 132 has a cylindrical shape.

[0082] The rotating shaft part 113 is coupled to the inner ring 132. This allows the rotating shaft part 113 to rotate in the circumferential direction D42 relative to the housing 32, the shaft support part 111, and the outer ring 131. The rotating shaft part 113 rotates around the central axis of the rotating brush 31.

[0083] The rotating shaft part 113 is coupled to the shaft body 41. As a result, the rotating shaft part 113 and the shaft body 41 configure a rotating shaft 141 that can rotate integrally in the circumferential direction D42 with respect to the housing 32, the pivot part 111, and the outer ring 131. As a result, the rotating shaft part 113, the shaft body 41, and the multiple brushes 42 can rotate integrally in the circumferential direction D42 with respect to the housing 32, the pivot part 111, and the outer ring 131. The rotating shaft part 113 and the shaft body 41 may be replaced with a one-piece rotating shaft.

[0084] 9 and 10, the rotating shaft part 113 includes a base portion 151, a screw boss portion 152, a pulley portion 153, a fitting portion 154, and a flange portion 155. The rotating shaft part 113 is formed with a screw hole 113a.

[0085] The base portion 151 , the screw boss portion 152 , the pulley portion 153 , the fitting portion 154 , the flange portion 121 and the screw hole 113 a of the rotating shaft part 113 have a common central axis that coincides with the central axis 31 p of the rotating brush 31 .

[0086] The screw boss portion 152 has a straight rod shape. A tip end of the screw boss portion 152 is coupled to the inner ring 132. This allows the rotating shaft part 113 to be coupled to the inner ring 132. A root end of the screw boss portion 152 is connected to the center of the base portion 151. The screw boss portion 152 extends from the base portion 151 to one side.

[0087] 10, the screw boss portion 152 includes an insertion portion 161 and a large diameter portion 162. The screw boss portion 152 has an outer circumferential surface 152a.

[0088] One end of the insertion portion 161 is at the tip of the screw boss portion 152. The other end of the insertion portion 161 is connected to one end of the large diameter portion 162. As a result, the large diameter portion 162 is connected to the insertion portion 161. The other end of the large diameter portion 162 is at the base of the screw boss portion 152 and is connected to the base portion 151. Each of the insertion portion 161 and the large diameter portion 162 has a cylindrical shape. The insertion portion 161 has a diameter that fits the diameter of the shaft hole 132a of the inner ring 132. The large diameter portion 162 has a diameter larger than the diameter of the shaft hole 132a and has a diameter larger than the diameter of the insertion portion 161. Therefore, the outer circumferential surface 152a of the screw boss portion 152 has a step at the axial direction D43 position where the boundary between the insertion portion 161 and the large diameter portion 162 exists. The insertion portion 161 is inserted into the shaft hole 132a. The step of the outer circumferential surface 152 a abuts against the inner ring 132 .

[0089] The length of the insertion portion 161 in the axial direction D43 is equal to or less than the length of the axial hole 132a of the inner ring 132 in the axial direction D43. Therefore, the insertion portion 161 does not protrude from the axial hole 132a. This makes it possible to prevent the protruding insertion portion 161 from interfering with the tapping screw 114.

[0090] The screw hole 113a of the rotating shaft part 113 is formed across the insertion portion 161, the large diameter portion 162, and the base portion 151, and passes through the rotating shaft part 113. The screw hole 113a is formed at least in the insertion portion 161, but does not necessarily have to be formed across the insertion portion 161, the large diameter portion 162, and the base portion 151. Therefore, the screw hole 113a of the rotating shaft part 113 does not have to pass through the rotating shaft part 113.

[0091] The base portion 151 has a disk shape.

[0092] The pulley portion 153 has a cylindrical shape. A root of the pulley portion 153 is connected to an edge of the base portion 151. The pulley portion 153 extends from the base portion 151 to one side.

[0093] A belt 92 is wound around the pulley portion 153. As a result, the driving force generated by the brush motor 91 is transmitted to the pulley portion 153. As a result, the rotating shaft part 113 rotates due to the transmitted driving force.

[0094] The fitting portion 154 has a cylindrical shape. The base of the fitting portion 154 is connected to the edge of the base portion 151. The fitting portion 154 extends from the base portion 151 to the other side. The internal space 41c has a cylindrical shape. The fitting portion 154 has a diameter that matches the diameter of the internal space 41c, which is formed in the shaft body 41 and has a cylindrical shape. The fitting portion 154 is fitted into the internal space 41c. In this way, the fitting portion 154 is connected to the shaft body 41.

[0095] The flange portion 155 has a plate-like outer shape. The flange portion 155 spreads outward in the radial direction from the base of the fitting portion 154. The flange portion 155 has a diameter larger than the diameter of the internal space 41c of the shaft body 41. Therefore, the flange portion 121 abuts against one end of the shaft body 41 when the fitting portion 154 is inserted into the internal space 41c.

[0096] The tapping screw 114 is screwed into a threaded hole 113 a of the rotating shaft part 113 .

[0097] The tapping screw 114 presses the inner ring 132 toward the large diameter portion 162, thereby pressing the inner ring 132 toward the rotating shaft part 113. As a result, the inner ring 132 is pressed against the step on the outer circumferential surface 152a of the thread boss portion 152, and is sandwiched between the step on the outer circumferential surface 152a and the tapping screw 114. As a result, the inner ring 132 can be directly fastened to the rotating shaft part 113.

[0098] The rotating shaft part 113 is a resin molded product. Therefore, when the tapping screw 114 is screwed into the screw hole 113a of the rotating shaft part 113, the insertion part 161 is elastically deformed and bulges outward in the radial direction D41. As a result, when the tapping screw 114 is screwed into the screw hole 113a, it presses the insertion part 161 outward in the radial direction D41, thereby pressing the insertion part 161 toward the inner ring 132. This allows the insertion part 161 to be in close contact with the inner ring 132 from the inside in the radial direction D41.

[0099] As shown in FIGS. 9 and 10, the tapping screw 114 includes a shaft portion 171 and a head portion 172 .

[0100] A screw groove is formed on the outer circumferential surface of the shaft portion 171. The head portion 172 is connected to one end of the shaft portion 171. Therefore, the head portion 172 is connected to the shaft portion 171. As a result, when the shaft portion 171 is rotated while being inserted into the screw hole 113a of the rotating shaft part 113, the shaft portion 171 advances toward the back of the screw hole 113a until the seat surface of the head portion 172 abuts against the inner ring 132 while forming a screw groove on the inner circumferential surface of the rotating shaft part 113. As a result, the shaft portion 171 is screwed into the screw hole 113a. The head portion 172 presses the inner ring 132 in the axial direction D43, thereby pressing the inner ring 132 toward the large diameter portion 162. A washer may be provided to be inserted between the seat surface of the head portion 172 and the inner ring 132.

[0101] When the bearing of the rotating brush is an oil-impregnated sintered bearing, a metal shaft that becomes an inner ring is inserted into the shaft hole of the oil-impregnated sintered bearing. Also, a rotating shaft part is joined to the metal shaft. The rotating shaft part is joined to the metal shaft by insert molding, in which a resin fluid is injected around the metal shaft and the injected resin fluid is hardened to change it into a rotating shaft part, or by fastening the rotating shaft part to the metal shaft. Therefore, the core of the rotating brush is run out due to defects in insert molding and an increase in cumulative tolerance due to fastening. Also, when the bearing of the rotating brush is an oil-impregnated sintered bearing, a gap must exist between the inner peripheral surface of the shaft hole and the outer peripheral surface of the metal shaft. Therefore, the gap causes the core of the rotating brush to run out. Therefore, noise is generated due to the core of the rotating brush. Therefore, it is not possible to provide a suction port body with high noise reduction. Also, the outer peripheral surface of the metal shaft must have high surface accuracy. Therefore, the cost of the rotating brush is high.

[0102] When the bearing of the rotating brush is a ball bearing, a metal shaft is inserted into the shaft hole of the inner ring of the bearing by press-fitting or the like. This makes it possible to prevent the rotating brush from wobbling due to a gap. However, it is not possible to prevent wobbling due to defects in the insert molding and an increase in the cumulative tolerance associated with fastening. For this reason, it is not possible to provide a suction port body that is highly quiet.

[0103] In contrast to these, in the rotating brush 31 provided in the vacuum cleaner 1 of the first embodiment, the inner ring 132 is directly fastened to the rotating shaft part 113. This makes it possible to suppress the occurrence of core wobble of the rotating brush 31 caused by defects in insert molding and an increase in cumulative tolerances associated with fastening. This makes it possible to provide a suction port body 11 that is highly quiet. In addition, the cost of the rotating brush 31 is reduced.

[0104] Furthermore, in the head portion of the wall cleaning device disclosed in Patent Document 1, when the half-threaded bolt is inclined with respect to the axis, the wobble of the rotating brush increases.

[0105] In contrast to this, in the suction port body 11 provided in the vacuum cleaner 1 of the first embodiment, even if the tapping screw 114 is inclined with respect to the axis, the inner ring 132 can be directly fastened to the rotating shaft part 113, and the insertion part 161 can be brought into close contact with the inner ring 132 from the inside in the radial direction D41. Therefore, even if the tapping screw 114 is inclined with respect to the axis, the core wobble of the rotating brush 31 does not increase.

[0106] 2. Second embodiment The following describes the differences between the second embodiment and the first embodiment. For points that are not described, the second embodiment employs the same configuration as that employed in the first embodiment.

[0107] FIG. 11 is a perspective view that diagrammatically illustrates the vacuum cleaner according to the second embodiment.

[0108] The vacuum cleaner 1 of the first embodiment shown in Fig. 1 is a stick-type vacuum cleaner that is moved by a user along a surface to be cleaned. In the vacuum cleaner 1, as shown in Fig. 3, a suction port body 11 that is detachably attached to an extension tube 12 has a suction port 181 that sucks in air and dust, and a suction unit 13 sucks in air and dust via the suction port 181. In addition, a rotating brush 31 is disposed in the suction port 181.

[0109] In contrast, the vacuum cleaner 2 of the second embodiment shown in FIG. 11 is a self-propelled vacuum cleaner that moves by itself along the surface to be cleaned. The self-propelled vacuum cleaner is, for example, a robot vacuum cleaner. The vacuum cleaner 2 does not have a suction port body that is attached to and detached from other elements, but has a suction port 181 and a suction unit 13, and the suction unit 13 sucks air and dust through the suction port 181. In addition, the rotating brush 31 is disposed in the suction port 181. Therefore, the vacuum cleaner 2 has a built-in suction port structure that includes the rotating brush 31 and the opposing wall 61. The opposing wall 51 of the vacuum cleaner 2 also has, like the opposing wall 51 of the vacuum cleaner 1, a closest part 71 that is closest to the central axis 31p of the rotating brush 31, and a sound-deadening structure 72 that is disposed behind the closest part 71 and disposed in a range where the rotating brush chamber 32a of the housing 32 exists in a direction parallel to the central axis 31p of the rotating brush 31.

[0110] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same action and effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0111] 1,2 vacuum cleaner, 11 suction port body, 12 extension tube, 13 suction part, 21 main body, 22 connection tube, 22d air passage, 31 rotating brush, 31p central shaft, 32 housing, 32a rotating brush chamber, 32b opening, 32c lower surface, 32d air passage, 32e expansion chamber, 32f front end, 32g rear end, 32h confinement space, 32i brush motor chamber, 32j groove, 41 shaft body, 41a outer peripheral surface, 41b groove, 41c internal space, 42 brush, 51 lower portion, 52 upper portion, 52b hole, 61 opposing wall, 62 side wall, 71 closest portion, 72 sound deadening structure, 81 first portion, 81a hole, 81b hole, 82 second portion, 82a hole, 91 brush motor, 92 Belt, 101 base, 102 bristles, 111 bearing part, 112 ball bearing, 113 rotating shaft part, 113a screw hole, 114 tapping screw, 121 flange part, 122 cylindrical part, 122a first internal space, 122b second internal space, 122c inner peripheral surface, 131 outer ring, 132 inner ring, 132a shaft hole, 141 rotating shaft, 151 base, 152 screw boss part, 152a outer peripheral surface, 153 pulley part, 154 fitting part, 155 flange part, 161 insertion part, 162 large diameter part, 171 shaft part, 172 head part, 181 suction port, D11 forward direction, D12 rearward direction, D21 leftward direction, D22 rightward direction, D31 upward direction, D32 Downward direction, D41 radial direction, D42 circumferential direction, D43 axial direction.

Claims

1. A rotating brush having an outer circumferential surface and rotating about an axis; a housing including a rotating brush chamber defining the rotating brush and including an opposing wall opposing the outer circumferential surface; Equipped with The opposing wall is a nearest neighbor closest to said axis; a sound deadening structure disposed behind the closest portion and in a range in which the rotating brush chamber exists in a direction parallel to the axis; Equipped The suction port of a vacuum cleaner.

2. The housing has a bottom surface, an opening having a front end and a rear end and exposing the rotary brush chamber to the lower surface of the housing; The opposing wall extends from the rear end to the front end above the rotating brush, The closest portion is disposed between the sound deadening structure and the front end. A suction mouth body of a vacuum cleaner according to claim 1.

3. The sound deadening structure is disposed throughout the range. A suction mouth body of a vacuum cleaner according to claim 2.

4. The closest portion and the sound absorbing structure are disposed above the rotating brush. A suction mouth body of a vacuum cleaner according to claim 3.

5. The rotating brush comprises bristles; The closest portion is the portion of the opposing wall where the hair hits the opposing wall most strongly. A suction mouth body of a vacuum cleaner according to claim 4.

6. An expansion chamber is formed in the housing, The opposing wall is formed with a plurality of holes that communicate with the expansion chamber and constitute the sound deadening structure. A suction head body of a vacuum cleaner according to any one of claims 1 to 5.

7. The plurality of holes includes two or more holes that are equally spaced in the direction and distributed throughout the range in the direction. A suction mouth body of a vacuum cleaner according to claim 6.

8. The closest portion and the sound absorbing structure are disposed above the rotating brush. A suction mouth body of a vacuum cleaner according to claim 1 or 2.

9. A brush motor is provided to rotate the rotary brush, a brush motor chamber in which the brush motor is disposed is formed in the housing; A hole communicating with the brush motor chamber is formed in the opposing wall, The hole is formed behind the closest part. A suction head body of a vacuum cleaner according to any one of claims 1 to 5.

10. The hole is formed behind the sound deadening structure. A suction head body of a vacuum cleaner according to claim 9.

11. The rotating brush comprises bristles; The closest portion is the portion of the opposing wall where the hair hits the opposing wall most strongly. A suction head body of a vacuum cleaner according to any one of claims 1 to 3.

12. A suction mouth body of a vacuum cleaner according to any one of claims 1 to 5; A suction unit that sucks dust through the suction mouth body; A vacuum cleaner equipped with

13. A rotating brush having an outer circumferential surface and rotating about an axis; a housing including a rotating brush chamber defining the rotating brush and including an opposing wall opposing the outer circumferential surface; Equipped with The opposing wall is a nearest neighbor closest to said axis; a sound deadening structure disposed behind the closest portion and in a range in which the rotating brush chamber exists in a direction parallel to the axis; Equipped Suction port structure of a self-propelled vacuum cleaner.

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