Dust collector

Abstract

Provided is a dust collector capable of suppressing noise generation, the dust collector including: a motor assembly having a motor and a fan that rotates about a rotational axis by rotational force generated by the motor; a cover disposed around the motor assembly; a guide portion that guides at least a portion of air from the fan toward an outer surface of the cover; and a rib that guides at least a portion of the air guided by the guide portion along a circumferential direction of the rotational axis on the outer surface of the cover.

Description

Technical Field

[0001] This invention relates to a vacuum cleaner. Background Technology

[0002] A vacuum cleaner includes a motor and a fan that rotates due to the rotational force generated by the motor. The fan's rotation draws air in along with dust through the vacuum cleaner's suction inlet. After circulating within the vacuum cleaner's internal space, the air is expelled through the exhaust outlet.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-047669 Summary of the Invention

[0006] Noise from a vacuum cleaner can cause discomfort to the user and those around them.

[0007] The purpose of this invention is to suppress the generation of noise.

[0008] According to the present invention, a vacuum cleaner is provided, characterized in that the vacuum cleaner comprises: a motor assembly having a motor and a fan that rotates about a rotation axis by means of the rotational force generated by the motor; a cover disposed around the motor assembly; a guide portion for guiding at least a portion of the air from the fan toward the outer surface of the cover; and a rib for guiding at least a portion of the air guided by the guide portion along the circumferential direction of the rotation axis on the outer surface of the cover.

[0009] According to the present invention, the generation of noise can be suppressed. Attached Figure Description

[0010] Figure 1 This is a perspective view of the vacuum cleaner involved in the embodiment.

[0011] Figure 2 This is a side view of the vacuum cleaner according to the embodiment.

[0012] Figure 3 This is a cross-sectional view of the vacuum cleaner involved in the embodiment.

[0013] Figure 4 This is a perspective view showing the drive unit involved in the implementation method as viewed from the front.

[0014] Figure 5 This is a perspective view showing the drive unit involved in the implementation method as viewed from the rear.

[0015] Figure 6 This is an exploded perspective view showing the drive unit involved in the implementation method as viewed from the front.

[0016] Figure 7 This is an exploded perspective view showing the drive unit involved in the implementation method as viewed from the rear.

[0017] Figure 8 This is a cross-sectional view showing the drive unit involved in the implementation method.

[0018] Figure 9 This is a diagram showing the first cover involved in the implementation method as viewed from the front.

[0019] Figure 10 This is a diagram showing the first cover involved in the implementation method as viewed from the rear.

[0020] Figure 11 This is a perspective view showing the motor assembly, the second elastic member, and the second cover, viewed from the front, used to illustrate the assembly method of the drive unit involved in the embodiment.

[0021] Figure 12 This is a perspective view showing the motor assembly, the second elastic member, and the second cover, viewed from the rear, used to illustrate the assembly method of the drive unit involved in the embodiment.

[0022] Figure 13 This is a diagram of the second cover that holds the motor assembly involved in the embodiment, viewed from the front right.

[0023] Figure 14 This is a diagram of the second cover that holds the motor assembly involved in the embodiment, viewed from the left front.

[0024] Figure 15 This is a diagram of the second cover that holds the motor assembly involved in the implementation method, viewed from the right side.

[0025] Figure 16 This is a diagram of the second cover that holds the motor assembly involved in the embodiment, viewed from the left.

[0026] Figure 17 This is a diagram showing the second cover that holds the motor assembly involved in the embodiment from the front.

[0027] Figure 18 This is a diagram showing the second cover that holds the motor assembly involved in the implementation method, viewed from the rear.

[0028] Figure 19 This is a schematic diagram illustrating the airflow in the drive unit involved in the embodiment.

[0029] Figure 20This is a schematic diagram illustrating a driving unit according to yet another embodiment.

[0030] Figure 21 This is a schematic diagram illustrating a drive unit according to another embodiment.

[0031] Figure 22 This is a schematic diagram illustrating the drive unit according to another embodiment.

[0032] Explanation of reference numerals in the attached figures

[0033] 1…vacuum cleaner; 2…outer shell; 2D…outer shell; 2R…ring-shaped part; 2T…inner surface; 3…drive unit; 3B…drive unit; 3C…drive unit; 3D…drive unit; 4…battery assembly; 5…inlet; 6…exhaust port; 7…battery; 8…motor assembly; 9…cover; 9B…cover; 9C…cover; 9D…cover; 10…motor; 10B…base plate; 10R…rotor shaft; 10S…stator; 11…fan; 12…motor housing; 13…control board; 14…handle; 15…mode switch button; 16…drive button; 17…display unit; 18…support component; 19…filter; 20…sound-absorbing component; 21…front shell; 21F…hook part; 21M…opening; 21L…locking part; 2 1P…Connecting pipe section; 22…Rear casing; 22C…Annular section; 22L…Left casing; 22R…Right casing; 22S…Screw; 23…Cylinder section; 23S…Outer surface; 24…Fan shroud section; 25…Support section; 25A…Cylinder section; 25B…Rear plate section; 25C…Protrusion; 26…Foot section; 27…Intake port; 28…Exhaust port; 31…First cover; 31C…First cover section; 32…Second cover; 32C…Second cover section; 33…First cylinder section; 33S…Outer surface; 33T…Inner surface; 34…Front plate section; 34A…First annular section; 34B…Second annular section; 34C…Third annular section; 34D…Rib; 34F…Front surface; 34R…Rear surface (opposite side); 35…Intake port; 35D… Inlet; 36… rectifier; 36A… 4th annular portion; 36B… 5th annular portion; 36C… 6th annular portion; 36D… rib; 37… 1st protrusion; 38… 2nd protrusion; 39… screw opening; 41… 2nd cylindrical portion; 41D… recess; 41S… outer surface; 41T… inner surface; 42… rear plate portion; 42F… front surface; 42R… rear surface; 43… opening; 44… screw boss; 45… screw hole; 46… pin; 47… support portion; 48… 3rd protrusion; 49… 4th protrusion; 50… rib; 51… 1st rib; 51A… inner end; 51B… outer end; 52… 2nd rib; 52A… inner end; 52B… outer end; 53… 3rd rib; 53A… inner end; 53B… Outer end; 511…Inlet rib; 512…Circumferential rib; 513…Outlet rib; 521…Inlet rib; 522…Circumferential rib; 523…Outlet rib; 531…Inlet rib; 532…Circumferential rib; 60…Elastic member; 61…First elastic member; 61D…First elastic member; 62…Second elastic member; 63…First connecting part; 64…Second connecting part; 65…Blocking part; 66…Pipe part; 67…Support hole; 70…Guide part; 80…Cable; 81…Screw; 91…Inlet; 91A…Inlet; 91B…Inlet; 92…Flow path; 92A…Flow path; 92B…Flow path; 93…Outlet; 93A…Outlet; 93B…Outlet; 100…Controller;AX… rotation axis. Detailed Implementation

[0034] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The constituent elements of the embodiments described below can be appropriately combined. In addition, sometimes it is not necessary to use some of the constituent elements.

[0035] In this implementation, the terms "front," "back," "left," "right," "up," and "down" are used to describe the positional relationships of the various parts. These terms indicate the relative position or direction with respect to the center of the vacuum cleaner 1.

[0036] [Overview of Vacuum Cleaners]

[0037] Figure 1 This is a perspective view of the vacuum cleaner 1 according to the embodiment. Figure 2 This is a side view of the vacuum cleaner 1 according to the embodiment. Figure 3 This is a cross-sectional view showing the vacuum cleaner 1 according to the embodiment.

[0038] The vacuum cleaner 1 includes: a housing 2, a drive unit 3, a battery assembly 4, and a controller 100.

[0039] The housing 2 houses the drive unit 3. The housing 2 includes a front housing 21 and a rear housing 22. The front housing 21 has an opening 21M. The opening 21M is located at the rear of the front housing 21. The front portion of the rear housing 22 is inserted into the opening 21M of the front housing 21. The front housing 21 and the rear housing 22 are connected by the front portion of the rear housing 22 being inserted into the opening 21M. The front housing 21 and the rear housing 22 can be disassembled and reassembled.

[0040] The front housing 21 has an intake port 5. The front housing 21 has a connecting pipe portion 21P. The connecting pipe portion 21P is disposed at the front of the front housing 21. The intake port 5 is provided at the front end of the connecting pipe portion 21P. The intake port 5 connects the internal space of the front housing 21 to the external space.

[0041] The base of the suction tube (not shown) is inserted into the suction port 5. A suction nozzle (not shown) is connected to the front end of the suction tube. A locking part 21L is provided in the connecting tube section 21P. The locking part 21L secures the connecting tube section 21P and the suction tube. A recess is provided in a portion of the suction tube. Figure 3 As shown, the locking part 21L has a hook part 21F. The hook part 21F hooks onto the recess of the suction tube, thus securing the connecting tube part 21P and the suction tube. By releasing the fixation provided by the locking part 21L, the suction tube can be detached from the connecting tube part 21P. The suction tube can be attached to and detached from the connecting tube part 21P.

[0042] The rear housing 22 has an exhaust port 6. The rear housing 22 includes a left housing 22L and a right housing 22R. The left housing 22L is positioned further to the left than the right housing 22R. The left housing 22L and the right housing 22R are secured together by a plurality of screws 22S. Exhaust ports 6 are respectively provided on the left housing 22L and the right housing 22R. The exhaust ports 6 connect the internal space of the rear housing 22 to the external space.

[0043] like Figure 3 As shown, the drive unit 3 is disposed in the internal space of the rear housing 22. The drive unit 3 has a motor assembly 8 and a cover 9.

[0044] The motor assembly 8 includes a motor 10, a fan 11, a motor housing 12, and a control board 13. The motor 10 generates a rotational force that drives the fan 11 to rotate. The fan 11 rotates due to the rotational force generated by the motor 10. The motor housing 12 houses the motor 10 and the fan 11. The control board 13 outputs control signals to control the motor 10. The control board 13 may include, for example, a field-effect transistor (FET).

[0045] Cover 9 is positioned around motor assembly 8. Cover 9 houses motor assembly 8.

[0046] The rear casing 22 has a handle 14. The handle 14 is for the user of the vacuum cleaner 1 to hold. A mode switching button 15, a drive button 16, and a display unit 17 are provided on the handle 14. The mode switching button 15 and the drive button 16 are operated by the user. The user can operate the mode switching button 15 and the drive button 16 while holding the handle 14.

[0047] The battery assembly 4 is located at the lower rear of the housing 2. The battery 7 is assembled in the battery assembly 4. The battery 7 can be detached from the battery assembly 4.

[0048] The storage battery 7 functions as the power source for the vacuum cleaner 1. The storage battery 7 supplies power to the vacuum cleaner 1 when it is mounted in the battery assembly 4. The motor 10 is driven by the power supplied from the storage battery 7. The controller 100 operates using the power supplied from the storage battery 7. The storage battery 7 is a general-purpose storage battery that can be used as a power source for various electrical devices. The storage battery 7 can be used as a power source for power tools. The storage battery 7 can be used as a power source for electrical devices other than power tools. The storage battery 7 can be used as a power source for vacuum cleaners other than the vacuum cleaner 1 described in this embodiment. The storage battery 7 includes a lithium-ion battery. The storage battery 7 is a rechargeable storage battery. The battery assembly 4 has the same structure as the battery assembly of a power tool.

[0049] The user of vacuum cleaner 1 can perform the following operations: installing battery 7 into battery assembly section 4 and removing battery 7 from battery assembly section 4. Battery assembly section 4 has a guide member and main body terminals. Battery 7 has battery terminals. The guide member of battery assembly section 4 guides battery 7. The main body terminals of battery assembly section 4 are connected to the battery terminals of battery 7. The user can install battery 7 into battery assembly section 4 by inserting battery 7 from the rear. Battery 7 is inserted into battery assembly section 4 while being guided by the guide member. With battery 7 installed in battery assembly section 4, the battery terminals of battery 7 are electrically connected to the main body terminals of battery assembly section 4. Battery 7 has a release button. The user of vacuum cleaner 1 operates the release button of battery 7 to move battery 7 rearward, thereby removing battery 7 from battery assembly section 4.

[0050] The controller 100 controls the electronic equipment mounted on the vacuum cleaner 1. The controller 100 controls the motor 10 via the control board 13. The controller 100 controls the drive current supplied to the motor 10 from the battery 7. The controller 100 is housed in the rear housing 22. The controller 100 includes a board on which multiple electronic components are mounted. Examples of electronic components mounted on the board include: a processor such as a CPU (Central Processing Unit), non-volatile memory such as ROM (Read Only Memory) or RAM, volatile memory such as RAM (Random Access Memory), and resistors.

[0051] like Figure 3 As shown, the vacuum cleaner 1 has a support member 18 that supports the filter 19. The support member 18 is composed of multiple linear components. The support member 18 is disposed within the interior space of the front housing 21. The filter 19 captures dust. The filter 19 is disposed around the support member 18. The support member 18 and the filter 19 are disposed within the interior space of the front housing 21 between the suction inlet 5 and the drive unit 3.

[0052] The sound-absorbing component 20 is disposed within the interior space of the rear housing 22. The sound-absorbing component 20 is positioned opposite the exhaust port 6. The sound-absorbing component 20 is a porous component with continuous air bubbles. The sound-absorbing component 20 absorbs sound transmitted through the air to suppress noise generation. Examples of noise generated by the vacuum cleaner 1 include wind noise generated by airflow and NZ noise generated by the rotation of the fan 11.

[0053] Vacuum cleaner 1 is a handheld vacuum cleaner that can perform cleaning operations while the user holds the handle 14. When the motor 10 stops, the motor 10 starts running immediately upon pressing the drive button 16. Once the motor 10 starts running, the fan 11 also rotates. The rotation of the fan 11 generates suction force at the suction port 5. By generating suction force at the suction port 5, air and dust from the external space of the housing 2 are drawn in along with the suction port 5. The air drawn in from the suction port 5 flows into the internal space of the front housing 21. The air flowing into the internal space of the front housing 21 passes through the filter 19. The filter 19 captures dust contained in the air. After passing through the filter 19, the air passes through the drive unit 3 and is then discharged from the exhaust port 6 back into the external space of the housing 2. When the motor 10 is running, the speed of the motor 10 can be adjusted in four levels by pressing the mode switch button 15. When the motor 10 is running, pressing the mode switch button 15 once changes the speed of the motor 10 from the first speed to the second speed. When the mode switch button 15 is pressed once more, the speed of motor 10 changes from speed 2 to speed 3. Pressing the mode switch button 15 again changes the speed of motor 10 from speed 3 to speed 4. Pressing the mode switch button 15 a third time returns the speed of motor 10 to speed 1. By changing the speed of motor 10, the suction force at the suction inlet 5 is altered. When motor 10 is in operation, pressing the drive button 16 will stop motor 10.

[0054] The display unit 17 has four light-emitting units. Light-emitting diodes (LEDs) can be used as examples of these units. When the motor 10 is driven at a first rotational speed, one light-emitting unit illuminates. When the motor 10 is driven at a second rotational speed, two light-emitting units illuminate. When the motor 10 is driven at a third rotational speed, three light-emitting units illuminate. When the motor 10 is driven at a fourth rotational speed, all four light-emitting units illuminate. When the motor 10 stops, all four light-emitting units turn off.

[0055] [Fan's rotating shaft]

[0056] Fan 11 rotates about the rotation axis AX by the rotational force generated by motor 10. In the following description, the radial direction of the rotation axis AX is appropriately referred to as radial. The direction around the rotation axis AX is appropriately referred to as circumferential or rotational direction. The direction parallel to the rotation axis AX is appropriately referred to as axial.

[0057] In the radial direction, the position closer to or in the direction of the rotation axis AX is appropriately referred to as the radially inner side, and the position farther from or in the direction away from the rotation axis AX is appropriately referred to as the radially outer side. The position or direction of one side in the circumferential direction is referred to as the circumferential side, and the position or direction of the other side in the circumferential direction is appropriately referred to as the circumferential other side. Similarly, the position or direction of one side in the axial direction is appropriately referred to as the axial side, and the position or direction of the other side in the axial direction is appropriately referred to as the axial other side.

[0058] In this implementation, the rotation axis AX extends in the front-to-back direction. One side of the axis is the front side, and the other side is the rear side.

[0059] [Drive Unit]

[0060] Figure 4 This is a perspective view showing the drive unit 3 involved in the implementation method as viewed from the front. Figure 5 This is a perspective view showing the drive unit 3 involved in the implementation method as viewed from the rear. Figure 6 This is an exploded perspective view of the drive unit 3 involved in the implementation method as viewed from the front. Figure 7 This is an exploded perspective view of the drive unit 3 involved in the implementation method as viewed from the rear. Figure 8 This is a cross-sectional view showing the drive unit 3 according to the embodiment. The drive unit 3 includes: a motor assembly 8, a cover 9, a rib 50, a guide portion 70, and an elastic member 60.

[0061] <Motor Assembly>

[0062] like Figure 6 , Figure 7 ,as well as Figure 8 As shown, the motor assembly 8 includes: a motor 10, a fan 11, a motor housing 12, and a control board 13.

[0063] Motor 10 generates rotational force to drive fan 11 to rotate. Motor 10 is an internal rotor type. Motor 10 has: a cylindrical stator 10S, and a rotor disposed inside the stator 10S. Rotor shaft 10R is fixed to the rotor. The front part of rotor shaft 10R protrudes forward from stator 10S. Fan 11 is fixed to the front part of rotor shaft 10R.

[0064] Fan 11 is positioned further forward than motor 10. Fan 11 rotates around its axis AX by the rotational force generated by motor 10. Fan 11 is a centrifugal fan. When fan 11 rotates, air in front of fan 11 is drawn in by fan 11. The air drawn in by fan 11 is then exhausted radially outward from fan 11.

[0065] The motor housing 12 houses the motor 10 and the fan 11. The motor housing 12 has a cylindrical part 23, a fan cover part 24, a support part 25, and a foot part 26.

[0066] The cylindrical portion 23 is configured to surround the rotating shaft AX. The fan shroud 24 is positioned further forward than the fan 11. The fan shroud 24 is located at the front end of the cylindrical portion 23.

[0067] The support portion 25 supports the motor 10 and the control board 13. The support portion 25 has a cylindrical portion 25A, a rear plate portion 25B, and a protrusion 25C. The cylindrical portion 25A is disposed around the stator 10S. The rear plate portion 25B is connected to the rear end of the cylindrical portion 25A. The protrusion 25C protrudes further rearward than the rear surface of the rear plate portion 25B. The cylindrical portion 25A fixes the stator 10S. The base plate 10B is fixed to the front end of the stator 10S. The base plate 10B is substantially circular. A hole for mounting the rotor shaft 10R is formed in the center of the base plate 10B. The fan 11 is positioned further forward than the base plate 10B. The periphery of the base plate 10B is fixed to the cylindrical portion 23. The stator 10S is fixed to the cylindrical portion 23 by means of the base plate 10B.

[0068] The foot 26 is positioned further rearward than the rear plate 25B. The foot 26 is fixed to the support 25. Two feet 26 are provided. The two feet 26 are positioned opposite each other in the radial direction. The feet 26 are positioned further radially outward than the outer surface 23S of the cylindrical portion 23.

[0069] The motor housing 12 has an intake port 27 and an exhaust port 28. The intake port 27 is located at the front end of the motor housing 12. The exhaust port 28 is located further rearward than the intake port 27. In this embodiment, the intake port 27 is located at the center of the fan shroud 24. The exhaust port 28 is located between the rear end of the cylinder 23 and the outer surface of the cylinder 25A. Air from the fan 11 is exhausted through the exhaust port 28 to a position further rearward than the motor housing 12.

[0070] The control board 13 outputs control signals to control the motor 10. The control board 13 is positioned further rearward than the rear plate portion 25B. The control board 13 is positioned opposite the rear plate portion 25B of the support portion 25. The control board 13 is supported by the protrusion 25C of the support portion 25. The control board 13 is positioned between the two feet 26.

[0071] <Mask>

[0072] Cover 9 is positioned around motor assembly 8. Cover 9 houses motor assembly 8. (As...) Figure 3 As shown, cover 9 is fixed to outer shell 2.

[0073] The cover 9 includes a first cover 31 and a second cover 32. At least a portion of the second cover 32 is positioned further rearward than the first cover 31. The first cover 31 and the second cover 32 are connected together. The second cover 32 is detachable from the first cover 31. The first cover 31 and the second cover 32 together form an internal space for the motor assembly 8 to be mounted on the cover 9.

[0074] Figure 9 This is a diagram showing the first cover 31 as viewed from the front in relation to the implementation method. Figure 10 This is a diagram showing the first cover 31 involved in the implementation method as viewed from the rear. (See diagram.) Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 ,as well as Figure 10 As shown, the first cover 31 has: a first cylindrical portion 33, a front plate portion 34, an intake port 35, a rectifier portion 36, a first protrusion portion 37, and a second protrusion portion 38.

[0075] The first cylindrical portion 33 is substantially cylindrical. The first cylindrical portion 33 is configured to surround the rotation axis AX. The first cylindrical portion 33 has an outer surface 33S and an inner surface 33T. The outer surface 33S and the inner surface 33T are respectively configured to surround the rotation axis AX. The outer surface 33S faces radially outward. The inner surface 33T faces radially inward.

[0076] The front plate portion 34 is connected to the front end of the first cylindrical portion 33. The front plate portion 34 is substantially circular in shape. The front plate portion 34 has a front surface 34F and a rear surface 34R. The front surface 34F faces forward. The rear surface 34R faces rearward.

[0077] The intake port 35 is located in the center of the front panel portion 34. The intake port 35 includes a through hole that connects the front surface 34F and the rear surface 34R of the front panel portion 34.

[0078] A first annular portion 34A, a second annular portion 34B, a third annular portion 34C, and a plurality of ribs 34D are provided on the front surface 34F of the front plate portion 34. The first annular portion 34A, the second annular portion 34B, the third annular portion 34C, and the ribs 34D each protrude forward from the front surface 34F. The first annular portion 34A is configured to surround the intake port 35. The second annular portion 34B is configured to surround the first annular portion 34A. The third annular portion 34C is configured to surround the second annular portion 34B. The plurality of ribs 34D are arranged at intervals in the circumferential direction. The ribs 34D extend radially. The ribs 34D are respectively connected to the first annular portion 34A, the second annular portion 34B, and the third annular portion 34C. The front end of the first annular portion 34A, the front end of the second annular portion 34B, and the front end of the third annular portion 34C are positioned further forward than the front end of the rib 34D.

[0079] A rectifier 36 is disposed inside the intake 35. The rectifier 36 guides the air drawn in through the intake 35. The rectifier 36 includes a fourth annular portion 36A, a fifth annular portion 36B, a sixth annular portion 36C, and a plurality of ribs 36D. The front ends of the fourth annular portion 36A, the fifth annular portion 36B, the sixth annular portion 36C, and the ribs 36D are positioned further forward than the front surface 34F. The fourth annular portion 36A is disposed at the center of the intake 35. The fifth annular portion 36B is configured to surround the fourth annular portion 36A. The sixth annular portion 36C is configured to surround the fifth annular portion 36B. A plurality of ribs 36D are disposed at circumferential intervals. The ribs 36D extend radially. Ribs 36D are connected to the fourth annular portion 36A, the fifth annular portion 36B, and the sixth annular portion 36C, respectively. The sixth annular portion 36C defines the shape of the intake port 35. The sixth annular portion 36C is fixed to the front plate portion 34. The fourth annular portion 36A and the fifth annular portion 36B are fixed to the sixth annular portion 36C by means of ribs 36D.

[0080] A first protrusion 37 is provided on the outer surface 33S of the first cylindrical portion 33. The first protrusion 37 protrudes radially outward from the outer surface 33S. Four first protrusions 37 are provided at intervals in the circumferential direction. Two first protrusions 37 are provided in the axial direction. That is, eight first protrusions 37 are provided on the outer surface 33S.

[0081] The second protrusion 38 is provided on the outer surface 33S of the first cylindrical portion 33. The second protrusion 38 protrudes radially outward from the outer surface 33S. One second protrusion 38 is provided on the upper part of the outer surface 33S.

[0082] A plurality of screw openings 39 are provided in the front panel portion 34. In this embodiment, four screw openings 39 are provided.

[0083] The first cylindrical portion 33, the front plate portion 34, the straightening portion 36, the first protrusion 37, and the second protrusion 38 are integrally formed. The first cover 31 is formed by insert molding. The substrate of the first cover 31 is made of synthetic resin. Polypropylene resin can be exemplified as a synthetic resin. The coating material covering the substrate is an elastomer. Synthetic rubber can be exemplified as an elastomer.

[0084] In this embodiment, the outer surface 33S, the first annular portion 34A, the second annular portion 34B, the third annular portion 34C, the rib 34D, the first protrusion 37, and the second protrusion 38 are made of an elastic material. The inner surface 33T and the straightening portion 36 are made of synthetic resin.

[0085] like Figure 3 As shown, the rear outer shell 22 has an annular portion 22C positioned further forward than the cover 9. The annular portion 22C is fixed to the inner surface of the rear outer shell 22. The rear surface of the annular portion 22C contacts the front surfaces of the first annular portion 34A, the second annular portion 34B, and the third annular portion 34C. The cover 9 and the outer shell 2 are positioned by the contact between the rear surface of the annular portion 22C and the front surfaces of the first annular portion 34A, the second annular portion 34B, and the third annular portion 34C.

[0086] The first protrusion 37 contacts the inner surface of the rear outer casing 22. By the first protrusion 37 contacting the inner surface of the rear outer casing 22, the cover 9 and the outer casing 2 are positioned.

[0087] The second protrusion 38 contacts the inner surface of the rear housing 22. The cover 9 and the housing 2 are positioned by the second protrusion 38 contacting at least a portion of the inner surface of the rear housing 22.

[0088] The first annular portion 34A, the second annular portion 34B, the third annular portion 34C, the first protrusion 37, and the second protrusion 38, which are in contact with the rear outer casing 22, undergo elastic deformation. This suppresses the transmission of vibrations generated by the drive unit 3 to the outer casing 2.

[0089] like Figure 4 , Figure 5 , Figure 6 , Figure 7 ,as well as Figure 8 As shown, the second cover 32 has: a second cylindrical portion 41, a rear plate portion 42, an opening 43, a screw boss 44 with a screw hole 45, a support portion 47 supporting a pin 46, a third protrusion 48, and a fourth protrusion 49.

[0090] The second cylindrical portion 41 is substantially cylindrical. The second cylindrical portion 41 is configured to surround the rotation axis AX. The second cylindrical portion 41 has an outer surface 41S and an inner surface 41T. The outer surface 41S and the inner surface 41T are respectively configured to surround the rotation axis AX. The outer surface 41S faces radially outward. The inner surface 41T faces radially inward. In this embodiment, the inner diameter of the rear portion of the second cylindrical portion 41 tends to decrease towards the rear.

[0091] The rear plate portion 42 is connected to the rear end of the second cylindrical portion 41. The rear plate portion 42 is substantially circular in shape. The rear plate portion 42 has a front surface 42F and a rear surface 42R. The front surface 42F faces forward. The rear surface 42R faces rearward.

[0092] An opening 43 is provided in a portion of the rear plate portion 42. The opening 43 includes a through hole that connects the front surface 42F and the rear surface 42R of the rear plate portion 42.

[0093] A plurality of screw bosses 44 are provided at the front of the second cover 32. In this embodiment, four screw bosses 44 are provided. Each of the plurality of screw bosses 44 is provided with a screw hole 45.

[0094] Support portion 47 supports pin 46. Pin 46 is made of rubber. Support portion 47 includes a recess provided on the inner surface 41T of the second cylindrical portion 41. Four support portions 47 are provided at circumferential intervals. Pin 46 is supported on each of the four support portions 47. The four pins 46 contact the outer surface 23S of the cylindrical portion 23 of the motor housing 12. The second cover 32 and the motor housing 12 are positioned by the four pins 46.

[0095] The third protrusion 48 protrudes rearward from the upper part of the rear surface 42R of the rear plate portion 42. Two third protrusions 48 are provided. The two third protrusions 48 are arranged in the left-right direction. Figure 3 As shown, the third protrusion 48 contacts the sound-absorbing component 20. The third protrusion 48 on the left side supports the sound-absorbing component 20 disposed at the exhaust port 6 of the left outer casing 22L. The third protrusion 48 on the right side supports the sound-absorbing component 20 disposed at the exhaust port 6 of the right outer casing 22R.

[0096] The fourth protrusion 49 protrudes rearward from the lower part of the rear surface 42R of the rear plate portion 42. One fourth protrusion 49 is provided. Figure 3 As shown, the fourth protrusion 49 contacts the sound-absorbing component 20. The sound-absorbing component 20 is configured to face the exhaust port 6 of the rear housing 22, and the fourth protrusion 49 supports the sound-absorbing component 20.

[0097] <rib>

[0098] Rib 50 is fixed to the outer surface 41S of the second cylindrical portion 41. Rib 50 protrudes radially outward from the outer surface 41S of the second cylindrical portion 41. In an embodiment, rib 50 includes: a first rib 51, a second rib 52, and a third rib 53. For example... Figure 6 as well as Figure 7 As shown, in this embodiment, two first ribs 51, two second ribs 52, and two third ribs 53 are provided. The two first ribs 51 are positioned radially opposite each other. The two second ribs 52 are positioned radially opposite each other. The two third ribs 53 are positioned radially opposite each other. A first screw boss 44 and a second screw boss 44 are provided on one of the first ribs 51. A third screw boss 44 and a fourth screw boss 44 are provided on the other first rib 51. The screw bosses 44 are configured to protrude forward from the first ribs 51.

[0099] In this embodiment, the second cylindrical portion 41, the rear plate portion 42, the screw boss 44, the support portion 47, the third protrusion 48, the fourth protrusion 49, and the rib 50 are integrally formed. The second cover 32 is formed of synthetic resin. ABS (Acrylonitrile-Butadiene-Styrene) resin can be exemplified as the synthetic resin used to form the second cover 32.

[0100] <Guidance Department>

[0101] like Figure 8 As shown, the drive unit 3 includes a guide portion 70 that guides at least a portion of the air from the fan 11 toward the outer surface of the second cover 32. In this embodiment, the outer surface of the second cover 32 includes the outer surface 41S of the second cylinder portion 41. The guide portion 70 guides at least a portion of the air from the fan 11 toward the outer surface 41S of the second cylinder portion 41.

[0102] Air from fan 11 is discharged through exhaust port 28 to a side further rearward than motor housing 12. The air discharged from exhaust port 28 to the rearward side of motor housing 12 flows forward between the outer surface of motor housing 12 and the inner surface 41T of the second cylinder 41. In this embodiment, the outer surface of motor housing 12 includes the outer surface 23S of cylinder 23. After the air flowing forward between the outer surface of motor housing 12 and the inner surface 41T of the second cylinder 41 touches the rear surface 34R of the front plate portion 34 of the first cover 31, it flows from the front end of the outer surface 41S of the second cylinder 41 towards the outer surface 41S of the second cylinder 41. In this embodiment, guide portion 70 includes the outer surface of motor housing 12 and the inner surface 41T of the second cylinder 41 opposite to the outer surface of motor housing 12. Additionally, guide portion 70 includes the rear surface 34R of the front plate portion 34 of the first cover 31.

[0103] <Elastic Components>

[0104] The drive unit 3 has an elastic member 60 disposed between the cover 9 and at least a portion of the motor housing 12. The elastic member 60 is capable of suppressing the transmission of vibrations generated by the motor 10 or the fan 11 to the cover 9.

[0105] In one embodiment, the elastic member 60 includes a first elastic member 61 and a second elastic member 62. At least a portion of the first elastic member 61 is disposed at a position further forward than the motor housing 12. At least a portion of the second elastic member 62 is disposed at a position further rearward than the motor housing 12.

[0106] The first elastic member 61 is capable of suppressing the transmission of vibrations generated by the motor 10 or the fan 11 to the first cover 31. The first elastic member 61 is disposed between the surface of the fan shroud portion 24 of the motor housing 12 and the rear surface 34R of the front plate portion 34 of the first cover 31. The rear surface 34R of the front plate portion 34 of the first cover 31 is an opposing surface opposite to at least a portion of the surface of the fan shroud portion 24 of the motor housing 12. The front plate portion 34 of the first cover 31 has an intake port 35 disposed at a position further forward than the fan shroud portion 24. The first elastic member 61 is annular, surrounding the intake port 35. The first elastic member 61 is connected to the rear surface 34R of the front plate portion 34.

[0107] The first elastic member 61 and the first cover 31 are integrally molded. The first elastic member 61 can also be regarded as part of the first cover 31. As described above, when the first cover 31 is formed by insert molding, the first elastic member 61 can also be formed by a coating material (elastic body) covering the substrate of the first cover 31.

[0108] The second elastic member 62 can suppress the transmission of vibrations generated by the motor 10 or fan 11 to the second cover 32. The second elastic member 62 is disposed between the motor housing 12 and the rear plate portion 42 of the second cover 32. The second cover 32 has an opening 43 provided at a position further rearward than the motor housing 12. The second elastic member 62 is connected to at least a portion of the motor housing 12 when the opening 43 is blocked. In an embodiment, the second elastic member 62 is connected to the foot 26 of the motor housing 12.

[0109] The second elastic member 62 includes a first connecting portion 63, a second connecting portion 64, a locking portion 65, and a tube portion 66. The first connecting portion 63 is fixed to one foot 26. The second connecting portion 64 is fixed to the other foot 26. The locking portion 65 is disposed between the first connecting portion 63 and the second connecting portion 64. The locking portion 65 is disposed inside the opening 43. The tube portion 66 protrudes rearward from the rear surface of the locking portion 65. A support hole 67 is provided in the tube portion 66.

[0110] [Assembly method of the drive unit]

[0111] Figure 11 This is a perspective view showing the motor assembly 8, the second elastic member 62, and the second cover 32, viewed from the front, for illustrating the assembly method of the drive unit 3 involved in the embodiment. Figure 12 This is a perspective view showing the motor assembly 8, the second elastic member 62, and the second cover 32, viewed from the rear, for illustrating the assembly method of the drive unit 3 involved in the embodiment.

[0112] like Figure 11 as well as Figure 12 As shown, cable 80 is connected to control board 13. Cable 80 connects controller 100 to control board 13. Examples of cable 80 include: a power line for supplying power from battery 7 to motor 10, and a signal line for supplying control signals to control board 13. Cable 80 is disposed in support hole 67 of second elastic member 62.

[0113] In the case of assembling drive unit 3, such as Figure 11 as well as Figure 12 As shown, the second elastic member 62 is connected to the foot 26 of the motor housing 12. The second elastic member 62 is connected to the foot 26 of the motor housing 12 with the cable 80 positioned in the support hole 67. The second elastic member 62 is connected to the motor housing 12 by hooking its first connecting portion 63 to one foot 26 and its second connecting portion 64 to the other foot 26.

[0114] The two feet 26 protrude radially outward from the outer surface 23S of the cylinder 23. Therefore, even if the size of the second elastic member 62 is larger than the size of the cylinder 23, the second elastic member 62 can be properly connected to the motor housing 12 via the feet 26.

[0115] The second elastic member 62 is connected to the motor housing 12 in such a way that the sealing part 65 is opposite to the control base plate 13. The first connecting part 63 and the second connecting part 64 are respectively disposed at a position further radially outward than the control base plate 13.

[0116] After connecting the motor housing 12 to the second elastic member 62, the motor housing 12 and the second elastic member 62 are connected to the second cover 32. The motor housing 12 and the second elastic member 62 are inserted into the inside of the second cover 32 through the front opening of the second cover 32. In this embodiment, a portion of the inner surface 41T of the second cylindrical portion 41 is provided with a recess 41D that is recessed radially outward. Two recesses 41D are provided. The recesses 41D extend axially. The front end of the recess 41D is connected to the first rib 51. The first connecting portion 63 is movable axially inside one of the recesses 41D. The second connecting portion 64 is movable axially inside the other recess 41D. The motor housing 12 and the second elastic member 62 are inserted into the inside of the second cover 32 such that the closing portion 65 of the second elastic member 62 blocks the opening 43 of the second cover 32. Pin 46 contacts the outer surface 23S of the cylindrical portion 23 of the motor housing 12, which is inserted inside the second cover 32. The motor housing 12 is positioned by pin 46. At least a portion of the cable 80 extends rearward from the rear end of the support hole 67.

[0117] After connecting the motor assembly 8 and the second elastic member 62 to the second cover 32, the first cover 31 and the second cover 32 are connected. The inner diameter of the first cylindrical portion 33 of the first cover 31 is larger than the outer diameter of the second cylindrical portion 41 of the second cover 32. The first cover 31 and the second cover 32 are connected such that at least a portion of the inner surface 33T of the first cylindrical portion 33 faces the outer surface 41S of the second cylindrical portion 41. A rib 50 is provided on the outer surface 41S of the second cylindrical portion 41. The first cover 31 and the second cover 32 are connected such that the rib 50 is disposed inside the first cylindrical portion 33. The rib 50 is disposed between the inner surface 33T of the first cylindrical portion 33 and the outer surface 41S of the second cylindrical portion 41.

[0118] The first cover 31 has a screw opening 39. The second cover 32 has a screw hole 45. (Example) Figure 4 , Figure 6 ,as well as Figure 7 As shown, the first cover 31 and the second cover 32 are secured by four screws 81. The screws 81 are inserted from the front side of the first cover 31 into the screw opening 39, and then into the screw hole 45, engaging with the screw hole 45. Accordingly, the first cover 31 and the second cover 32 are secured by the screws 81.

[0119] like Figure 8As shown, once the first cover 31 and the second cover 32 are connected, the fan shroud 24 disposed at the front end of the motor housing 12 will come into contact with the first elastic member 61 supported by the first cover 31. The motor assembly 8 is connected to the first cover 31 by means of the first elastic member 61. The motor assembly 8 is connected to the second cover 32 by means of the second elastic member 62. The motor assembly 8 is supported on the cover 9 by means of the first elastic member 61 and the second elastic member 62. The motor assembly 8 is supported on the cover 9 in a state where it is axially clamped by the first elastic member 61 and the second elastic member 62.

[0120] [Ribs and flow paths]

[0121] Figure 13 This is a view from the right front of the second cover 32 that holds the motor assembly 8 involved in the implementation method. Figure 14 This is a view from the left front of the second cover 32 that holds the motor assembly 8 involved in the embodiment. Figure 15 This is a view from the right side of the second cover 32 that holds the motor assembly 8 involved in the implementation method. Figure 16 This is a view from the left of the second cover 32 that holds the motor assembly 8 involved in the implementation method. Figure 17 This is a view from the front of the second cover 32 that holds the motor assembly 8 involved in the embodiment. Figure 18 This is a view from the rear of the second cover 32 that holds the motor assembly 8 involved in the implementation method.

[0122] like Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 ,as well as Figure 18 As shown, the second cover 32 has a rib 50. The rib 50 is fixed to the outer surface 41S of the second cylinder portion 41. The rib 50 is capable of guiding at least a portion of the air that has been guided to the outer surface of the second cover 32 by the guide portion 70 along the circumferential direction on the outer surface of the second cover 32.

[0123] As described above, the air discharged from the exhaust port 28 of the motor housing 12 flows forward between the outer surface 23S of the cylindrical portion 23 of the motor housing 12 and the inner surface 41T of the second cylindrical portion 41 via the guide portion 70, and then flows from the front end of the outer surface 41S of the second cylindrical portion 41 to the outer surface 41S of the second cylindrical portion 41. The rib 50 guides the air flowing from the front end of the outer surface 41S of the second cylindrical portion 41 to the outer surface 41S of the second cylindrical portion 41 in the circumferential direction along the outer surface 41S of the second cylindrical portion 41.

[0124] Rib 50 is fixed to the outer surface 41S of the second cylindrical portion 41. Rib 50 protrudes radially outward from the outer surface 41S of the second cylindrical portion 41. In an embodiment, rib 50 includes: a first rib 51, a second rib 52, and a third rib 53. In an embodiment, two first ribs 51 are provided. Two second ribs 52 are provided. Two third ribs 53 are provided. The two first ribs 51 are arranged in radially opposite positions. The two second ribs 52 are arranged in radially opposite positions. The two third ribs 53 are arranged in radially opposite positions.

[0125] The first rib 51 has an inner end portion 51A connected to the outer surface 41S of the second cylindrical portion 41, and an outer end portion 51B disposed at a position further radially outward than the inner end portion 51A. The second rib 52 has an inner end portion 52A connected to the outer surface 41S of the second cylindrical portion 41, and an outer end portion 52B disposed at a position further radially outward than the inner end portion 52A. The third rib 53 has an inner end portion 53A connected to the outer surface 41S of the second cylindrical portion 41, and an outer end portion 53B disposed at a position further radially outward than the inner end portion 53A.

[0126] The first rib 51 includes: a circumferential rib 512 extending circumferentially, an inlet rib 511 extending axially, and an outlet rib 513 extending axially. The inlet rib 511 is connected to one end of the circumferential rib 512. The inlet rib 511 protrudes forward from one end of the circumferential rib 512. The inlet rib 511 guides air that has been guided to the outer surface of the second cover 32 by the guide portion 70 toward one end of the circumferential rib 512. The outlet rib 513 is connected to the other end of the circumferential rib 512. The outlet rib 513 protrudes rearward from the other end of the circumferential rib 512. The outlet rib 513 guides air from the other end of the circumferential rib 512 toward the rear of the outer surface of the second cover 32.

[0127] The second rib 52 includes: a circumferential rib 522 extending circumferentially, an inlet rib 521 extending axially, and an outlet rib 523 extending axially. The inlet rib 521 is connected to one end of the circumferential rib 522. The inlet rib 521 protrudes forward from one end of the circumferential rib 522. The inlet rib 521 guides air that has been guided to the outer surface of the second cover 32 by the guide portion 70 toward one end of the circumferential rib 522. The outlet rib 523 is connected to the other end of the circumferential rib 522. The outlet rib 523 protrudes rearward from the other end of the circumferential rib 522. The outlet rib 523 guides air from the other end of the circumferential rib 522 toward the rear of the outer surface of the second cover 32.

[0128] The third rib 53 includes a circumferential rib 532 extending circumferentially and an inlet rib 531 extending axially. The inlet rib 531 is connected to one end of the circumferential rib 532. The inlet rib 531 protrudes forward from one end of the circumferential rib 532. The inlet rib 531 guides air that has been guided to the outer surface of the second cover 32 by the guide portion 70 toward one end of the circumferential rib 532.

[0129] The circumferential ribs 512 of the first rib 51 and 522 of the second rib 52 are arranged axially spaced apart. The circumferential rib 522 of the second rib 52 is positioned further rearward than the circumferential rib 512 of the first rib 51. A portion of the circumferential ribs 512 of the first rib 51 and 522 of the second rib 52 overlap in a plane orthogonal to the axis of rotation AX. That is, a portion of the circumferential ribs 512 of the first rib 51 and 522 of the second rib 52 overlap each other axially.

[0130] The inlet rib 511 of the first rib 51 and the inlet rib 521 of the second rib 52 are arranged at different positions in the circumferential direction.

[0131] The outlet rib 513 of the first rib 51 and the outlet rib 523 of the second rib 52 are arranged at different positions in the circumferential direction.

[0132] The circumferential ribs 522 of the second rib 52 and 532 of the third rib 53 are arranged axially spaced apart. The circumferential rib 532 of the third rib 53 is positioned further rearward than the circumferential rib 522 of the second rib 52. A portion of the circumferential ribs 522 of the second rib 52 and 532 of the third rib 53 overlap in a plane orthogonal to the axis of rotation AX. That is, a portion of the circumferential ribs 522 of the second rib 52 and 532 of the third rib 53 overlap each other axially.

[0133] The inlet rib 521 of the second rib 52 and the inlet rib 531 of the third rib 53 are arranged at different positions in the circumferential direction.

[0134] As described above, two of each of the first rib 51, second rib 52, and third rib 53 are provided. A portion of one party's first rib 51 and a portion of one party's second rib 52 overlap in a plane orthogonal to the rotation axis AX. A portion of one party's second rib 52 and a portion of one party's third rib 53 overlap in a plane orthogonal to the rotation axis AX. A portion of the other party's first rib 51 and a portion of the other party's second rib 52 overlap in a plane orthogonal to the rotation axis AX. A portion of the other party's second rib 52 and a portion of the other party's third rib 53 overlap in a plane orthogonal to the rotation axis AX.

[0135] The first rib 51 of one side and the first rib 51 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The first rib 51 of one side and the second rib 52 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The first rib 51 of one side and the third rib 53 of the other side do not overlap in a plane orthogonal to the rotation axis AX.

[0136] The second rib 52 of one side and the first rib 51 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The second rib 52 of one side and the second rib 52 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The second rib 52 of one side and the third rib 53 of the other side do not overlap in a plane orthogonal to the rotation axis AX.

[0137] The third rib 53 of one side and the first rib 51 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The third rib 53 of one side and the second rib 52 of the other side do not overlap in a plane orthogonal to the rotation axis AX. The third rib 53 of one side and the third rib 53 of the other side do not overlap in a plane orthogonal to the rotation axis AX.

[0138] In this embodiment, the outlet rib 513 of the first rib 51 and the inlet rib 531 of the third rib 53 are integral. At least a portion of the outlet rib 513 of the first rib 51 functions as the inlet rib 531 of the third rib 53.

[0139] The front end of the inlet rib 511 is positioned further forward than the front end of the second cylinder 41. The front end of the inlet rib 531 is positioned further forward than the front end of the second cylinder 41. Axially, the position of the front end of the inlet rib 521 is substantially equal to the position of the front end of the second cylinder 41.

[0140] like Figure 8 As shown, once the first cover 31 and the second cover 32 are connected, the front end of the inlet rib 531 contacts the rear surface 34R of the front plate portion 34 of the first cover 31. Furthermore, the radially outer ends of the inlet rib 531 and the radially outer ends of the outlet rib 513 contact the inner surface 33T of the first cylindrical portion 33 of the first cover 31. Airflow is suppressed between the outlet rib 513 and the inlet rib 531 and the first cover 31. The outlet rib 513 and the inlet rib 531 and the first cover 31 can also be sealed.

[0141] The rib 50 provides: an inlet 91 for air to flow in from the guide section 70, a flow path 92 for air flowing in from the inlet 91 to flow circumferentially, and an outlet 93 for air to flow out after passing through the rib 50. In this embodiment, at least two inlets 91 are provided circumferentially. At least two flow paths 92 are provided axially. At least two outlets 93 are provided circumferentially.

[0142] The inlet 91 includes an inlet 91A disposed between the first rib 51 and the second rib 52, and an inlet 91B disposed between the second rib 52 and the third rib 53. The inlets 91A and 91B are arranged circumferentially spaced apart. Two inlets 91A are provided around the second cylinder portion 41. Two inlets 91B are provided around the second cylinder portion 41.

[0143] The flow path 92 includes a flow path 92A disposed between the first rib 51 and the second rib 52, and a flow path 92B disposed between the second rib 52 and the third rib 53. The flow paths 92A and 92B are arranged axially spaced apart. Two flow paths 92A are disposed around the second cylinder portion 41. Two flow paths 92B are disposed around the second cylinder portion 41.

[0144] The outlet 93 includes an outlet 93A disposed between the first rib 51 and the second rib 52, and an outlet 93B disposed between the second rib 52 and the third rib 53. The outlets 93A and 93B are arranged circumferentially spaced apart. Two outlets 93A are provided around the second cylinder portion 41. Two outlets 93B are provided around the second cylinder portion 41.

[0145] An inlet 91A for air to flow in from the guide section 70 is provided between the inlet rib 511 of the first rib 51 and the inlet rib 521 of the second rib 52. The inlet 91A is defined by the front end of the second cylinder 41 between the inlet rib 511 and the inlet rib 521 and the rear surface 34R of the front plate 34.

[0146] An inlet 91B for air to flow in from the guide section 70 is provided between the inlet rib 521 of the second rib 52 and the inlet rib 531 of the third rib 53. The inlet 91B is defined by the front end of the second cylinder 41 between the inlet rib 521 and the inlet rib 531 and the rear surface 34R of the front plate 34.

[0147] An airflow path 92A is provided between a portion of the circumferential rib 512 of the first rib 51 and a portion of the circumferential rib 522 of the second rib 52. The airflow path 92A is defined by the rear surface of the circumferential rib 512, the front surface of the circumferential rib 522, the outer surface 41S of the second cylinder 41, and the inner surface 33T of the first cylinder 33. Air flows circumferentially within the airflow path 92A.

[0148] An airflow path 92B is provided between a portion of the circumferential rib 522 of the second rib 52 and a portion of the circumferential rib 532 of the third rib 53. The airflow path 92B is defined by the rear surface of the circumferential rib 522, the front surface of the circumferential rib 532, the outer surface 41S of the second cylinder 41, and the inner surface 33T of the first cylinder 33. Air flows circumferentially within the airflow path 92B.

[0149] An outlet 93A for air flowing out after passing through the flow path 92A between the first rib 51 and the second rib 52 is provided between the outlet rib 513 of the first rib 51 and the outlet rib 523 of the second rib 52. The outlet 93A is defined by the outer surface 41S of the second cylinder 41 and the inner surface 33T of the first cylinder 33 between the outlet rib 513 and the outlet rib 523.

[0150] An outlet 93B for air flowing out after passing through the flow path 92B between the second rib 52 and the third rib 53 is provided between the outlet rib 523 of the second rib 52 and the end of the circumferential rib 532 of the third rib 53. The outlet 93B is defined by the outer surface 41S of the second cylinder 41 and the inner surface 33T of the first cylinder 33 between the outlet rib 523 and the circumferential rib 532.

[0151] [action]

[0152] Next, the operation of the vacuum cleaner 1 according to the embodiment will be explained. With the motor 10 stopped, the motor 10 starts operating immediately upon the user pressing the drive button 16. The motor 10 is driven by power supplied from the battery 7. Driven by the motor 10, the fan 11 rotates. The rotation of the fan 11 generates suction force at the suction port 5. The suction force generated at the suction port 5 draws air from the external space of the outer casing 2 into the internal space of the front casing 21.

[0153] Dust contained in the air flowing into the interior space of the front housing 21 is captured by the filter 19. The air that has passed through the filter 19 is drawn into the intake port 35 of the drive unit 3.

[0154] Figure 19 This is a schematic diagram illustrating the airflow in the drive unit 3 according to the embodiment. Air drawn into the intake port 35 by the rotation of the fan 11 flows into the internal space of the motor housing 12 through the intake port 27. The air from the fan 11 is discharged through the exhaust port 28 to a side further rearward than the motor housing 12.

[0155] Air discharged from the exhaust port 28 of the motor housing 12 to the rear side, after contacting the front surface 42F of the rear plate portion 42 of the second cover 32, flows forward between the outer surface 23S of the cylindrical portion 23 of the motor housing 12 and the inner surface 41T of the second cylindrical portion 41. After the air flowing forward between the outer surface 23S of the cylindrical portion 23 of the motor housing 12 and the inner surface 41T of the second cylindrical portion 41, it contacts the rear surface 34R of the front plate portion 34 of the first cover 31, and flows into the outer surface 41S of the second cylindrical portion 41 from the front end of the outer surface 41S of the second cylindrical portion 41 via the inlet 91.

[0156] Air flowing into inlet 91 is guided circumferentially by rib 50. The air flows circumferentially in flow path 92 defined by rib 50. The air flowing in flow path 92 exits from outlet 93 to a side further rearward than the second cover 32. The air exiting from outlet 93 is discharged into the external space of the outer shell 2 via exhaust port 6.

[0157] Air is guided circumferentially through the ribs 50 on the outer surface of the second cover 32, thereby increasing the distance the air travels within the interior space of the outer shell 2. This increased air travel distance helps to suppress noise generation.

[0158] [Effect]

[0159] As explained above, according to the embodiment, air from the fan 11 is guided to the outer surface of the second cover 32 by the guide portion 70. The rib 50 guides at least a portion of the air guided to the outer surface of the second cover 32 by the guide portion 70 along the circumferential direction of the rotation axis AX on the outer surface of the second cover 32. Because the air flows circumferentially on the outer surface of the second cover 32, the distance the air travels within the interior space of the housing 2 is increased. Therefore, noise caused by the motor 10 or the fan 11 can be suppressed. Furthermore, the rib 50 extends circumferentially on the outer surface of the second cover 32. This helps to suppress the axial increase in size of the vacuum cleaner 1.

[0160] Rib 50 has: an inner end portion (51A, 52A, 53A) connected to the outer surface of the second cover 32, and an outer end portion (51B, 52B, 53B) disposed radially outward from the rotation axis AX, which is further outward than the inner end portion (51A, 52A, 53A). That is, rib 50 protrudes radially outward from the outer surface of the second cover 32. Accordingly, an airflow path 92 extending circumferentially is formed.

[0161] Rib 50 includes: circumferential ribs (512, 522, 532) extending circumferentially along the rotation axis AX; inlet ribs (511, 521, 531) extending axially along the rotation axis AX and guiding air from the other end of the circumferential ribs (512, 522, 532) toward one end of the circumferential ribs (511, 521, 532); and outlet ribs (513, 523, 533) extending axially along the rotation axis AX and guiding air from the other end of the circumferential ribs (512, 522, 532) toward the outer side of the outer surface of the second cover 32. Air guided to the outer surface of the second cover 32 by the guides 70 can smoothly flow into the flow path 92 through the inlet ribs (511, 521, 531). The circumferential ribs (512, 522, 532) form a flow path (91, 92) extending circumferentially, which increases the distance the air flows. Through the outlet ribs (513, 523, 533), the air that has flowed through the flow path 92 can flow out to the outside of the outer surface of the second cover 32.

[0162] Rib 50 includes a first rib 51 and a second rib 52. The circumferential rib portion 512 of the first rib 51 and the circumferential rib portion 522 of the second rib 52 are arranged spaced apart axially along the rotation axis AX. A portion of the circumferential rib portion 512 of the first rib 51 and a portion of the circumferential rib portion 522 of the second rib 52 overlap each other axially. Accordingly, an airflow path 92 extending circumferentially is provided between the circumferential rib portion 512 of the first rib 51 and a portion of the circumferential rib portion 522 of the second rib 52.

[0163] The inlet rib 511 of the first rib 51 and the inlet rib 521 of the second rib 52 are positioned at different locations along the circumferential direction of the rotation axis AX. Accordingly, an inlet 91 for air to flow in from the guide section 70 is provided between the inlet rib 511 of the first rib 51 and the inlet rib 521 of the second rib 52. Air from the guide section 70 can flow into the inlet 91.

[0164] The outlet rib 513 of the first rib 51 and the outlet rib 523 of the second rib 52 are positioned at different locations in the circumferential direction of the rotation axis AX. Accordingly, an outlet 93 is provided between the outlet rib 513 of the first rib 51 and the outlet rib 523 of the second rib 52 for air that has passed through the first rib 51 and the second rib 52 to flow out. Air that has passed through the flow path 92 can flow out from the outlet 93.

[0165] Rib 50 includes a third rib 53. At least two flow paths 92 are provided axially. In one embodiment, the flow path 92 includes flow path 92A and flow path 92B arranged axially spaced apart. At least two inlet 91 and two outlet 93 are provided circumferentially. In one embodiment, the inlet 91 includes inlet 91A and inlet 91B arranged circumferentially spaced apart. The outlet 93 includes outlet 93A and outlet 93B arranged circumferentially spaced apart. Accordingly, air guided to the outer surface of the second cover 32 by the guide 70 flows in a branched state into at least two flow paths 92. Since the air flows in a branched state, noise caused by the motor 10 or fan 11 can be effectively suppressed. In addition, flow paths 92A and 92B are provided as flow paths 92 extending in the circumferential direction. As a result, flow paths 92A and 92B extending in the circumferential direction can be extended respectively, thereby effectively suppressing the noise caused by the motor 10 or the fan 11.

[0166] Cover 9 includes a first cover 31 and a second cover 32 that can be detached from the first cover 31. The first cover 31 and the second cover 32 form an internal space for arranging the motor assembly 8. Accordingly, as shown in the reference... Figure 11 as well as Figure 12 As explained, after the motor assembly 8 is housed in the second cover 32, the motor assembly 8 can be configured in the interior space of the cover 9 by connecting the first cover 31 and the second cover 32.

[0167] The first cover 31 has a first cylindrical portion 33. The second cover 32 has a second cylindrical portion 41. The first cover 31 and the second cover 32 are connected such that at least a portion of the inner surface 33T of the first cylindrical portion 33 faces the outer surface 41S of the second cylindrical portion 41. A rib 50 is disposed between the inner surface 33T of the first cylindrical portion 33 and the outer surface 41S of the second cylindrical portion 41. Accordingly, by simply connecting the first cover 31 and the second cover 32, a flow path 92 defined by the surface of the rib 50, the inner surface 33T of the first cylindrical portion 33, and the outer surface 41S of the second cylindrical portion 41 can be formed.

[0168] Rib 50 is fixed to the outer surface 41S of the second cylindrical portion 41. Accordingly, the outflow path 92 can be formed simply by connecting the second cover 32 with rib 50 and the first cover 31. In an embodiment, the second cylindrical portion 41 and rib 50 are integrally molded, for example, by injection molding. Accordingly, the second cover 32 with rib 50 can be manufactured efficiently.

[0169] The motor assembly 8 has a motor housing 12 that houses the motor 10 and the fan 11. The motor housing 12 has an intake port 27 and an exhaust port 28. The fan 11 is positioned further forward (axially) than the motor 10. The intake port 27 is located at the front end (axially) of the motor housing 12. The exhaust port 28 is located further rearward (axially) than the intake port 27. Accordingly, air flowing into the interior space of the motor housing 12 from the intake port 27 due to the rotation of the fan 11 is exhausted through the exhaust port 28 to the side further rearward (axially) than the motor housing 12.

[0170] In one embodiment, the guide portion 70 includes an outer surface of the motor housing 12 and an inner surface 41T of the second cylindrical portion 41 opposite to the outer surface of the motor housing 12. Air discharged from the exhaust port 28 of the motor housing 12 to the rear side (the other side of the axial direction) flows forward (to one side of the axial direction) between the outer surface of the motor housing 12 and the inner surface 41T of the second cylindrical portion 41, and can then flow into the outer surface 41S of the second cylindrical portion 41 from the front end (one side of the axial direction).

[0171] An elastic member 60 is disposed between the cover 9 and at least a portion of the motor housing 12. Accordingly, vibrations generated by the motor 10 or the fan 11 can be suppressed from being transmitted to the cover 9.

[0172] In this embodiment, the elastic member 60 includes a first elastic member 61 and a second elastic member 62. At least a portion of the first elastic member 61 is disposed forward (on one axial side) than the motor housing 12. At least a portion of the second elastic member 62 is disposed rearward (on the other axial side) than the motor housing 12. The motor housing 12 is supported on the cover 9 while being sandwiched between the first elastic member 61 and the second elastic member 62. Accordingly, the transmission of vibrations generated by the motor 10 or the fan 11 to the cover 9 can be effectively suppressed.

[0173] The motor housing 12 includes a fan shroud 24 positioned further forward (axially) than the fan 11. A shroud 9 has a facing surface opposite at least a portion of the surface of the fan shroud 24. In this embodiment, the facing surface of the shroud 9 opposite at least a portion of the surface of the fan shroud 24 includes the rear surface 34R of the front plate portion 34 of the first shroud 31. A first elastic member 61 is disposed between the surface of the fan shroud 24 and the rear surface 34R of the front plate portion 34. Accordingly, vibrations generated by the motor 10 or the fan 11 transmitted to the first shroud 31 can be effectively suppressed.

[0174] The first cover 31 has an intake port 35 located further forward (axially) than the fan cover 24. The first elastic member 61 is annular and surrounds the intake port 35. Accordingly, the flow of air drawn in by the intake port 35 is not obstructed, thereby effectively suppressing the transmission of vibrations generated by the motor 10 or the fan 11 to the first cover 31.

[0175] The cover 9 has an opening 43 located further rearward (on the other side of the axial direction) than the motor housing 12. In this embodiment, the opening 43 is located on the rear plate portion 42 of the second cover 32. The second elastic member 62 is connected to at least a portion of the motor housing 12 when the opening 43 is blocked. Accordingly, the transmission of vibrations generated by the motor 10 or the fan 11 to the second cover 32 can be effectively suppressed. In addition, since the opening 43 is blocked by the second elastic member 62, air leakage from the fan 11 through the opening 43 can be prevented.

[0176] The motor housing 12 has a cylindrical portion 23 configured to surround a rotation shaft AX, and a foot portion 26 disposed at a position further radially outward than the outer surface 23S of the cylindrical portion 23 towards the rotation shaft AX. A second elastic member 62 is connected to the foot portion 26. Since at least a portion of the second elastic member 62 is disposed at a position further radially outward than the outer surface 23S of the cylindrical portion 23, the second elastic member 62 can block the opening 43 even if it is large. In addition, the operation of using the second elastic member 62 to block the opening 43 can be carried out smoothly.

[0177] The motor assembly 8 includes a control board 13 positioned further rearward (on the other axial side) than at least a portion of the motor housing 12. A cable 80 is connected to the control board 13. A second elastic member 62 includes a support hole 67 for the cable 80. Therefore, when the cable 80 is supported by the second elastic member 62, vibrations generated by the motor 10 or fan 11 transmitted to the second cover 32 can be effectively suppressed. Furthermore, the inner diameter of the support hole 67 is smaller than the size of the opening 43. Therefore, when the opening 43 is blocked using the second elastic member 62, air leakage from the fan 11 through the support hole 67 can be prevented.

[0178] The first elastic member 61 and the first cover 31 are integrally formed. Accordingly, it is possible to prevent the first elastic member 61 and the first cover 31 from separating.

[0179] [Other Implementation Methods]

[0180] In the following description, the same or equivalent components as those in the above-described embodiments are given the same reference numerals, and their descriptions are briefly or omitted.

[0181] Figure 20This is a schematic diagram illustrating the drive unit 3B according to yet another embodiment. For example... Figure 20 As shown, the drive unit 3B includes: a motor assembly 8, a cover 9B housing the motor assembly 8, and a rib 50. The cover 9B includes a first cover 31 and a second cover 32. The rib 50 is fixed to the inner surface of the first cover 31. Figure 20 In the example shown, the rib 50 is fixed to the inner surface 33T of the first cylindrical portion 33. The rib 50 is disposed between the inner surface 33T of the first cylindrical portion 33 and the outer surface 41S of the second cylindrical portion 41. In this way, the rib 50 can also be fixed to the inner surface of the first cover 31.

[0182] Figure 21 This is a schematic diagram illustrating the drive unit 3C according to another embodiment. Figure 21 As shown, the drive unit 3C includes: a motor assembly 8, a cover 9C housing the motor assembly 8, and a rib 50. The cover 9C includes a first cover portion 31C and a second cover portion 32C. The first cover portion 31C and the second cover portion 32C are integrally formed. The first cover portion 31C has a first cylindrical portion 33. The second cover portion 32C has a second cylindrical portion 41. The second cylindrical portion 41 is disposed around the first cylindrical portion 33. The rib 50 is disposed between the inner surface 33T of the first cylindrical portion 33 and the outer surface 41S of the second cylindrical portion 41. Thus, in the cover 9C, the first cover portion 31C and the second cover portion 32C can also be integrally formed.

[0183] Figure 22 This is a schematic diagram showing a 3D representation of the drive unit according to another embodiment. (e.g.) Figure 22 As shown, the drive unit 3D includes: a motor assembly 8, a cover 9D housing the motor assembly 8, and ribs 50. The cover 9D has the same structure as the second cover 32 described in the above embodiment. The cover 9D has a second cylindrical portion 41. A housing 2D is disposed around the cover 9D. Ribs 50 are disposed between the inner surface 2T of the housing 2D and the outer surface 41S of the second cylindrical portion 41. The housing 2D includes: an annular portion 2R having an intake port 35D. The annular portion 2R is connected to the motor housing 12 by means of a first elastic member 61D. Air flows into the intake port 27 through the intake port 35D. Thus, the housing 2D can also function as the first cover 31 described in the above embodiment.

[0184] In the above embodiments, the second cover 32 and the second elastic member 62 can also be integrally formed.

[0185] In the above embodiment, the drive unit 3 is installed in a handheld vacuum cleaner. The drive unit 3 can also be installed in a vacuum cleaner equipped with casters.

Claims

1. A vacuum cleaner, characterized in that, The vacuum cleaner includes: A motor assembly comprising a motor, a fan that rotates about a rotation axis extending in a front-rear direction by means of the rotational force generated by the motor, and a motor housing that houses the motor and the fan; A cover is disposed around the motor assembly; A guide section that directs at least a portion of the air from the fan toward the outer surface of the shroud; and Ribs that guide at least a portion of the air guided by the guide portion circumferentially along the axis of rotation on the outer surface of the cover. An air intake port is provided at the front end of the motor housing, and an exhaust port is provided at the rear end of the motor housing. The cover includes: a first cover having a first cylindrical portion and a front plate portion connected to the front end of the first cylindrical portion and having an intake port; and a second cover having at least a portion disposed at a position rearward of the first cover and detachable from the first cover, having a second cylindrical portion disposed radially inward of the first cylindrical portion relative to the rotation axis and a rear plate portion connected to the rear end of the second cylindrical portion. The first cover and the second cover form an internal space for configuring the motor assembly. The first cover and the second cover are connected such that at least a portion of the inner surface of the first cylindrical portion facing radially inward is opposite to at least a portion of the outer surface of the second cylindrical portion facing radially outward. The guide portion includes: the outer surface of the motor housing, the inner surface of the second cylindrical portion facing the outer surface of the motor housing, and the rear surface of the front plate portion. The rib is disposed between the inner surface of the first cylindrical part and the outer surface of the second cylindrical part by being fixed to the inner surface of the first cylindrical part or the outer surface of the second cylindrical part. Air drawn into the intake port by the fan's rotation flows into the interior space of the motor housing, and then exits through the exhaust port to a position further rear of the motor housing. After contacting the front surface of the rear plate, it flows forward from between the outer surface of the motor housing and the inner surface of the second cylinder. After contacting the rear surface of the front plate, it flows from the front end of the outer surface of the second cylinder into the space between the inner surface of the first cylinder and the outer surface of the second cylinder, and is guided by the ribs. The vacuum cleaner includes: an elastic member disposed between the cover and at least a portion of the motor housing. The elastic component includes a first elastic component and a second elastic component. At least a portion of the first elastic member is positioned further toward the axial side of the rotation shaft than the motor housing. At least a portion of the second elastic member is positioned further axially to the other side than the motor housing. The cover has an opening located further axially to the opposite side than the motor housing. The second elastic member, in the state of sealing the opening, is connected to at least a portion of the motor housing. The motor assembly includes a control board disposed at a position further axially to the other side than at least a portion of the motor housing. The second elastic member has a support hole for a cable configuration for connection to the control substrate.

2. The vacuum cleaner according to claim 1, characterized in that, The rib has: an inner end portion connected to the outer surface of the cover; and an outer end portion disposed radially outward from the rotation axis than the inner end portion.

3. The vacuum cleaner according to claim 1 or 2, characterized in that, The rib includes: a circumferential rib extending circumferentially along the axis of rotation; an inlet rib extending axially along the axis of rotation and guiding air directed to the outer surface of the cover toward one end of the circumferential rib; and an outlet rib extending axially along the axis of rotation and guiding air from the other end of the circumferential rib toward the outer side of the outer surface of the cover.

4. The vacuum cleaner according to claim 3, characterized in that, The ribs include the first rib and the second rib. The circumferential ribs of the first rib and the circumferential ribs of the second rib are arranged spaced apart in the axial direction of the rotation axis. The circumferential rib portion of the first rib and a portion of the circumferential rib portion of the second rib overlap each other in the axial direction. An airflow path is provided between the circumferential rib of the first rib and a portion of the circumferential rib of the second rib.

5. The vacuum cleaner according to claim 4, characterized in that, The inlet rib of the first rib and the inlet rib of the second rib are configured at different positions in the circumferential direction of the rotation axis. An inlet is provided between the inlet rib of the first rib and the inlet rib of the second rib for air to flow in from the guide portion.

6. The vacuum cleaner according to claim 5, characterized in that, The outlet rib of the first rib and the outlet rib of the second rib are configured at different positions in the circumferential direction of the rotation axis. An outlet is provided between the outlet rib of the first rib and the outlet rib of the second rib for air to flow out after passing through the rib.

7. The vacuum cleaner according to claim 6, characterized in that, The ribs include the third rib. At least two flow paths are provided in the axial direction. At least two inlets and two outlets are provided in the circumferential direction.

8. The vacuum cleaner according to claim 1, characterized in that, The rib is fixed to the outer surface of the second cylinder.

9. The vacuum cleaner according to claim 1, characterized in that, The motor housing has a fan shroud positioned further axially than the fan. The cover has: an opposing surface opposite to at least a portion of the surface of the fan cover. The first elastic member is disposed between the surface of the fan shroud and the opposite surface of the shroud.

10. The vacuum cleaner according to claim 9, characterized in that, The first elastic component is an annular shape surrounding the inlet.

11. The vacuum cleaner according to claim 1, characterized in that, The motor housing has: a cylindrical portion configured to surround the rotating shaft; and a foot portion disposed radially outward from the rotating shaft, further outward than the outer surface of the cylindrical portion. The second elastic component is connected to the foot.

12. The vacuum cleaner according to claim 1, characterized in that, The elastic component is integrally formed with the cover.

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