阅读说明：本技术 搅拌机 (Mixer ) 是由 秦季文 杨美生 荻野洋平 于 2019-05-20 设计创作，主要内容包括：本发明涉及搅拌机,其以简单的结构而降低异物等侵入的可能性。搅拌机(1)包括：主体壳体(2)；无刷马达(5),其以旋转轴(42)朝向前方的方式容纳于主体壳体(2)内；主轴(9),其由无刷马达(5)驱动旋转,从主体壳体(2)突出并能够供搅拌叶片拆装；离心风扇(49),其借助旋转轴(42)的旋转而旋转；以及电池组(23),其配置于主体壳体(2)的下部,在主体壳体(2)的无刷马达(5)的下方前表面设置有吸气口(57),该吸气口(57)借助离心风扇(49)的旋转而吸引外部空气。(The invention relates to a stirrer, which reduces the possibility of invasion of foreign matters and the like by a simple structure. The mixer (1) comprises: a main body case (2); a brushless motor (5) housed in the main body case (2) with the rotating shaft (42) facing forward; a main shaft (9) which is driven to rotate by the brushless motor (5), protrudes from the main body housing (2), and can be attached to and detached from the stirring blade; a centrifugal fan (49) that rotates by the rotation of the rotating shaft (42); and a battery pack (23) disposed at the lower part of the main body case (2), wherein an air inlet (57) is provided at the lower front surface of the brushless motor (5) of the main body case (2), and the air inlet (57) sucks the outside air by the rotation of the centrifugal fan (49).)

1. A stirring machine is characterized in that the stirring machine is provided with a stirring cylinder,

the mixer includes:

a housing;

a motor housed in the housing such that a rotation shaft thereof faces forward;

a final output shaft that is driven to rotate by the motor, protrudes from the housing, and is attachable to and detachable from the stirring blade;

a fan that rotates by rotation of the rotating shaft; and

a battery pack disposed at a lower portion of the case,

an air inlet is provided in a predetermined region of the casing below the motor except a side surface, and the air inlet sucks external air by rotation of the fan.

2. A stirrer is characterized in that a stirrer body is provided with a stirrer body,

the agitator includes:

a housing;

a motor housed in the housing such that a rotation shaft thereof faces forward;

a final output shaft that is driven to rotate by the motor, protrudes from the housing, and is attachable to and detachable from the stirring blade;

a fan that rotates by rotation of the rotating shaft; and

a battery pack disposed at a lower portion of the case,

an air outlet is provided in a predetermined area of the housing excluding a side surface thereof below the motor, and the air outlet is an air outlet through which air is sucked by rotation of the fan.

3. A mixer according to claim 1 or 2,

a barrier rib portion that suppresses movement of the material to be kneaded attached to the side surface toward the intake port or the exhaust port is provided on the side surface of the housing.

4. A mixer according to any of claims 1-3,

the suction port or the exhaust port is provided on a front surface of the housing, and on the other hand, a protection plate is attached to a front side of the housing, and at least a part of a formation region of the suction port or the exhaust port is covered with the protection plate in a front view.

5. A stirring machine is characterized in that the stirring machine is provided with a stirring cylinder,

the mixer includes:

a housing;

a motor housed in the housing such that a rotation shaft thereof faces forward;

a final output shaft that is driven to rotate by the motor, protrudes from the housing, and is attachable to and detachable from the stirring blade;

a fan that rotates by rotation of the rotating shaft; and

a battery pack disposed at a lower portion of the case,

a control circuit board is disposed above the battery pack in the case.

6. A stirrer is characterized in that a stirrer body is provided with a stirrer body,

the agitator includes:

a housing;

a motor housed in the housing such that a rotation shaft thereof faces forward;

a final output shaft that is driven to rotate by the motor, protrudes from the housing, and is attachable to and detachable from the stirring blade;

a fan that rotates by rotation of the rotating shaft;

a ring-shaped handle formed at a rear portion of the housing; and

and a battery pack disposed below the handle.

Technical Field

The present invention relates to a mixer capable of mixing a material to be mixed by a mixing blade by rotating a final output shaft to which the mixing blade is attached.

Background

For example, as disclosed in patent document 1, in a mixer, a mixing blade (mixing blade) is rotatably driven by a motor housed in a casing and is detachably attached to a final output shaft protruding forward from the casing, and a material to be mixed such as resin (resin) or mortar (mortar) can be mixed by rotation of the mixing blade in accordance with the driving of the motor.

Further, a fan for cooling the motor is provided on an output shaft of the motor, and the fan rotates with the rotation of the output shaft, thereby sucking external air from an air inlet provided in the casing to cool the motor, and then discharging the air to the outside from an air outlet provided in the casing.

Disclosure of Invention

In the above-described conventional mixer, if the air inlet is formed in the side surface of the housing, foreign matter or the like may be sucked from the air inlet in the side surface when the mixer is placed horizontally on the floor or the like, which may cause a failure. Therefore, a cover using a sponge, a metal mesh, or the like needs to be provided in the intake port, which increases the cost. Further, if the sponge or the like is clogged with dust, the amount of air is reduced, which deteriorates the cooling effect of the motor, and therefore, there is a need to clean or replace the cover periodically, which is troublesome for maintenance.

Accordingly, an object of the present invention is to provide a stirrer which has a simple structure, can reduce the possibility of entry of foreign matter and the like, can reduce the labor for maintenance, and has excellent usability.

In order to achieve the above object, the invention described in claim 1 is characterized in that the mixer includes: a housing; a motor housed in the housing such that a rotation shaft thereof faces forward; a final output shaft which is driven by the motor to rotate, protrudes from the housing, and can be used for assembling and disassembling the stirring blade; a fan that rotates by rotation of the rotating shaft; and a battery pack disposed at a lower portion of the casing, wherein an air inlet is provided in a predetermined region excluding a side surface below the motor of the casing, and the air inlet sucks external air by rotation of the fan.

In order to achieve the above object, the invention described in claim 2 is characterized in that the mixer includes: a housing; a motor housed in the housing such that a rotation shaft thereof faces forward; a final output shaft which is driven by the motor to rotate, protrudes from the housing, and can be used for assembling and disassembling the stirring blade; a fan that rotates by rotation of the rotating shaft; and a battery pack disposed at a lower portion of the case, wherein an air outlet is provided in a predetermined region excluding a side surface below the motor of the case, the air outlet being an air outlet through which air is sucked by rotation of the fan.

The invention described in claim 3 is characterized in that, in addition to the configuration of claim 1 or 2, a stopper rib is provided on a side surface of the casing, the stopper rib preventing the material to be kneaded adhering to the side surface from moving to the suction port side or the discharge port side.

The invention described in claim 4 is characterized in that, in the configuration described in any one of claims 1 to 3, the air inlet or the air outlet is provided on the front surface of the casing, a protective plate is attached to the front of the casing, and at least a part of a formation region of the air inlet or the air outlet is covered with the protective plate in a front view.

The invention described in claim 5 is characterized in that the agitator includes: a housing; a motor housed in the housing such that a rotation shaft thereof faces forward; a final output shaft which is driven by the motor to rotate, protrudes from the housing, and can be used for assembling and disassembling the stirring blade; a fan that rotates by rotation of the rotating shaft; and a battery pack disposed at a lower portion of the case, wherein the control circuit board is disposed above the battery pack in the case.

The invention described in claim 6 is characterized in that the mixer includes: a housing; a motor housed in the housing such that a rotation shaft thereof faces forward; a final output shaft which is driven by the motor to rotate and protrudes from the housing big to which the stirring blade can be attached and detached; a fan that rotates by rotation of the rotating shaft; a ring-shaped handle formed at the rear of the housing; and a battery pack disposed at a lower portion of the handle.

According to the present invention, since the air inlet and the air outlet are provided in the predetermined region excluding the side surface of the casing, it is possible to suppress the entry of foreign matters or the like from the air inlet and the air outlet without providing a cover using a sponge or a metal mesh. Therefore, the cost increase can be suppressed, and the cooling effect of the motor can be maintained because the ventilation resistance is not generated by the cover. Further, since maintenance required for installing the cover is not required, the use convenience is excellent.

Further, since the battery pack is disposed at the lower portion of the case, the center of gravity is located below the case, and therefore, the balance is improved and the operability is good.

Drawings

FIG. 1 is a perspective view of a blender.

FIG. 2 is a longitudinal central sectional view of the mixer.

Fig. 3 is an enlarged view of a lower coupling portion of fig. 2.

FIG. 4 is a side view of the blender with the battery cover open.

FIG. 5 is a side view of a blender having blending blades installed.

Fig. 6 is a side view of the mixer showing a state in which the front surface of the battery pack is visually confirmed by the mirror of the battery cover.

Description of the reference numerals

1 … blender; 2 … main body case; 3 … motor housing; 4 … a handle; 5 … brushless motor; 6 … front housing; 8 … planetary gear reduction mechanism; 9 … a main shaft; 15 … a gripping portion; 17 … battery mounting part; 18 … lower link; 26 … control circuit substrate; a 35 … stator; 36 … a rotor; 42 … rotating the shaft; 49 … centrifugal fan; 53 … front partition rib; 54 … exhaust port; 55 … air exhaust path; 56 … rear divider rib; 57 … suction opening; 58 … air suction path; 59 … blocking ribs; 60 … routing space; 80 … stirring blade.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a stirrer, and FIG. 2 is a central longitudinal sectional view. The agitator 1 has a cylindrical motor housing part 3 housing a brushless motor 5, and includes: a main body case 2 having a handle 4 connected to a rear portion of the motor accommodating portion 3; and a front case 6 assembled to the front side of the main body case 2. A gear box 7 is provided between the main body case 2 and the front case 6, the gear box 7 accommodates a planetary gear reduction mechanism 8 and is screwed to the front case 6 from the rear, and the front case 6 holds a spindle 9 as a final output shaft and projects the front end of the spindle 9 forward. A shaft holder 10 is provided at the tip of the main shaft 9, and the shaft holder 10 is coupled to a shaft 81 provided on a stirring blade 80, which will be described later. In addition, a side grip 11 is attached to the front housing 6, and a protective plate 12 is fitted and attached, and the protective plate 12 covers the entire front housing 6 and a part of the main body housing 2 in a front view except for a through portion of the spindle 9.

A pair of left and right half-divided cases 2a and 2b are fixed by screws 13 and 13 … in the left-right direction to assemble main body case 2, and front case 6 is fixed to motor housing unit 3 by screws 14 and 14 … screwed from the front. The motor housing portion 3 is also formed of the half-divided cases 2a and 2 b.

The handle 4 includes: a grip 15 extending in the vertical direction at the rear end of the handle 4; an upper connecting portion 16 extending forward from an upper end of the grip portion 15 and connected to a rear portion of the motor accommodating portion 3; a battery mounting portion 17 extending forward from a lower end of the grip portion 15 in a manner inclined forward and downward; and a lower coupling portion 18 extending from the upper surface of the battery mounting portion 17 forward and obliquely upward and coupled to the lower portion of the motor housing portion 3, thereby forming the handle 4 in a ring shape. The grip portion 15 is provided with a switch 19 for projecting the trigger 20 forward, and a lock lever 21 is provided above the switch 19, and the lock lever 21 normally restricts the pressing of the trigger 20 and allows the pressing of the trigger 20 by releasing the lock lever 21. A lock button 19a is provided on the left side surface of the switch 19, and the lock button 19a is operated from the left side of the main body case 2 to maintain the pressed state of the trigger 20. The portion of the trigger 20 protruding from the grip 15 is covered with a rubber cover 22.

The battery pack 23 can be mounted on the battery mounting portion 17 by sliding it from the rear, and a terminal block 24 and a controller 25 are housed inside in a posture inclined forward and downward similarly to the battery mounting portion 17, wherein the terminal block 24 is electrically connected to the mounted battery pack 23, and the controller 25 is located above the terminal block 24 and includes a control circuit board 26. A hanging hook 27 is screwed to the right side surface of the battery mounting portion 17, and the hanging hook 27 is replaceably attached to the left side surface of the battery mounting portion 17.

In addition, the battery mounting portion 17 is provided with a battery cover 28 that covers the mounted battery pack 23 from below. The battery cover 28 is formed in a box shape by rotatably coupling a cover-side projection 29 and a pair of assembly- side projections 30 and 30 by a hinge screw 31, wherein the cover-side projection 29 is provided to protrude from an upper portion of a front surface, the pair of assembly- side projections 30 and 30 are provided to protrude from lower portions of the front surface of the battery assembly 17 on both right and left sides of the cover-side projection 29, and a hook 32 that elastically engages with a lower portion of a rear end of the battery assembly 17 is integrally formed on an upper portion of the rear end of the battery cover 28. A mirror 33 (fig. 6) is provided on the inner bottom surface of the battery cover 28.

The brushless motor 5 is a built-in rotor type motor including a stator 35 and a rotor 36 inside thereof, and the stator 35 includes: a cylindrical stator core 37 formed of a plurality of laminated steel plates; a front insulator 38 and a rear insulator 39 provided on the axial front and rear end faces of the stator core 37, respectively; and coils 40, 40 … wound around the stator core 37 via front and rear insulators 38, 39. A sensor circuit board 41 on which a rotation detection element (not shown) that detects the position of a permanent magnet 44 provided on the rotor 36 and outputs a rotation detection signal is mounted on the rear insulator 39 in a perpendicular shape to a rotation shaft 42 of the rotor 36.

The rotor 36 has: a rotating shaft 42 located at the axial center; a rotor core 43 having a substantially cylindrical shape, which is disposed around the rotating shaft 42 and is formed by stacking a plurality of steel plates; and plate-shaped permanent magnets 44, 44 … fixed inside the rotor core 43. The rear end of the rotary shaft 42 is supported by a bearing 45 held on the inner surface of the handle 4, the front end of the rotary shaft 42 is supported by a bearing 47 held on a cover 46 that closes the rear of the gear case 7, and the front end provided with a pinion 48 protrudes into the gear case 7. A centrifugal fan 49 is mounted to the rotating shaft 42 at a position rearward of the bearing 47.

As shown in fig. 3, in the motor housing portion 3, two rear holding ribs 50a and 50b that hold the front and rear ends of the stator 35 are formed upright on the inner surfaces of the pair of half divided housings 2a and 2b, and a front holding rib 51 that holds the front insulator 38 in front of the two rear holding ribs 50a and 50b, respectively, in the vertical direction. A fan accommodating chamber 52 for accommodating the centrifugal fan 49 is formed by the front holding rib 51 and the cover 46. The lower ends of the front holding ribs 51 are bent rearward and connected to the lower ends of the rear holding ribs 50a, and the lower ends of the rear holding ribs 50a and 50b approach each other as they go downward and are connected to the lower side of the stator core 37.

Front partition ribs 53 are integrally formed on the inner surfaces of the respective pairs of half-divided cases 2a and 2b at the rear holding ribs 50a and 50b connected to each other, and the front partition ribs 53 extend downward of the stator core 37 in the lower connecting portion 18, are bent forward, and are connected to the front inner surface of the lower connecting portion 18. The exhaust ports 54, 54 … extending in the left-right direction are formed in a plurality of rows (4 rows here) in the front surface of the lower coupling portion 18 symmetrically on the left-right direction about the joint surface between the half shells 2a, 2b at equal intervals in the up-down direction, at a position above the portion connected to the front partition rib 53. Therefore, an exhaust passage 55 is formed in front of the front partition rib 53, and the exhaust passage 55 communicates with the fan accommodating chamber 52 and can discharge air sent from the centrifugal fan 49 to the outside through the exhaust port 54.

Further, rear partition ribs 56 are provided integrally with the inner surfaces of the respective pairs of half-divided cases 2a and 2b, respectively, rearward of the front partition ribs 53, the rear partition ribs 56 extending rearward from the front inner surface of the lower coupling portion 18 near the connection portion with the battery mounting portion 17, then being bent upward at substantially right angles, and extending upward so as to divide the interior of the lower coupling portion 18 in the front-rear direction, and the upper ends of the rear partition ribs 56 are positioned rearward of the front partition ribs 53 and below the stator 35. In the front surface of the lower coupling portion 18, between the front partition rib 53 and the rear partition rib 56, the air inlets 57 and 57 … extending in the left-right direction are formed in a plurality of rows (5 rows here) symmetrically on the left-right side with respect to the joint surface of the half cases 2a and 2b at equal intervals in the up-down direction. Therefore, an intake passage 58 is formed between the front partition rib 53 and the rear partition rib 56, and the intake passage 58 draws in the outside air from the intake port 57 and the outside air from the rear of the stator 35 in accordance with the rotation of the centrifugal fan 49.

As shown in fig. 4, a pair of stopper ribs 59, 59 are formed on the left and right side surfaces of the lower coupling portion 18 at positions rearward of the air outlet 54 and the air inlet 57, and the pair of stopper ribs 59, 59 extend from the upper surface of the battery mounting portion 17 obliquely forward and upward similarly to the lower coupling portion 18, are bent forward at a position above the air outlet 54, and reach a position forward of the air outlet 54.

Also, a wiring space 60 is formed between the rear partition rib 56 and the rear inner surface of the lower coupling portion 18, the wiring space 60 communicating the inside of the battery mounting portion 17 and the rear portion of the stator 35 in the motor housing portion 3. As shown in fig. 2 and 3, the wiring space 60 is provided with: a plurality of power supply lines (lead wires) 62, 62 … electrically connecting the control circuit board 26 and the terminals 61 of the rear insulator 39 provided on the stator 35; and a plurality of signal lines (lead wires) 63, 63 … electrically connecting the control circuit board 26 and the sensor circuit board 41. Further, a plurality of lead wires 64, 64 … for electrically connecting the terminal block 24 and the control circuit board 26 are provided below the rear partition rib 56. Here, since the controller 25 is supported in the battery mounting portion 17 so as to be inclined forward and downward, it is possible to easily perform the wiring of the power supply line 62, the signal line 63, and the lead wire 64 into the lower connecting portion 18 while securing a large wiring space for the lead wire 64. In fig. 2 and 3, one power supply line 62, one signal line 63, and one conductive line 64 are shown, and the other conductive lines are omitted.

On the other hand, in the planetary gear reduction mechanism 8 in the gear box 7, carriers 71A to 71C that support a plurality of planetary gears 72, 72 in the internal gears 70A to 70C are provided in 3 stages in the axial direction, and the planetary gear 72 of the first stage carrier 71A meshes with the pinion gear 48 of the rotary shaft 42. The third-stage carrier 71C is coupled to the rear end of the main shaft 9 supported by the front and rear bearings 65, 65 in the front housing 6.

The ring gear 70B meshing with the planetary gears 72 of the second-stage carrier 71B is provided to be rotatable and movable in the axial direction, and a mode switching ring 73 is engaged with the outer periphery of the ring gear 70B. The mode switching ring 73 includes a clamping piece 74, and the clamping piece 74 is clamped by the front and rear coil springs 75, 75 and protrudes downward. A switching dial 76 having an eccentric pin 77 on the upper surface is rotatably provided on the lower surface of the main body case 2, and the clamping piece 74 of the mode switching ring portion 73 can move forward and backward in conjunction with the movement of the eccentric pin 77 in the forward and backward directions.

Therefore, when the mode switching ring portion 73 is moved forward by the rotational operation of the switching dial 76, the ring gear 70B is engaged with the engagement ring portion 78 provided in the gear case 7 to restrict the rotation, and the planetary gears 72 of the second stage carrier 71B are made to perform planetary motion, thereby configuring a low speed mode in which the second stage reduction can be achieved. On the other hand, when the mode switching ring portion 73 is retracted by the rotational operation of the switching dial 76, the ring gear 70B is separated rearward from the engagement ring portion 78 and engaged with the first-stage carrier 71A, and the second-stage planet gears 72 and the first-stage carrier 71A are rotated integrally, thereby forming a high-speed mode in which the second-stage reduction is released.

In the agitator 1 configured as described above, as shown in fig. 4, the battery cover 28 is opened, the battery pack 23 is mounted on the battery mounting portion 17, and the battery cover 28 is closed, and as shown in fig. 5, the shaft 81 provided on the agitating blade 80 is coupled to the tip end of the main shaft 9 via the shaft bracket 10. In this state, when the trigger 20 is pressed to turn on the switch 19, the control circuit board 26 of the controller 25 acquires the rotational position of the rotor 36 based on the detection signal of the permanent magnet 44, which is obtained from the rotation detection element provided on the sensor circuit board 41, and causes the current to sequentially flow through the switching elements mounted on the control circuit board 26 based on the rotational position, thereby rotating the rotor 36. Therefore, the rotation shaft 42 rotates to transmit the rotation decelerated by the planetary gear reduction mechanism 8 to the main shaft 9, and the stirring blade 80 coupled to the main shaft 9 rotates to stir the material to be stirred.

When the centrifugal fan 49 is rotated by the rotation of the rotary shaft 42, the fan accommodating chamber 52 is formed with a negative pressure to suck the outside air from the air inlet 57. The sucked outside air passes through the air suction passage 58, passes between the stator 35 and the rotor 36 from the rear of the brushless motor 5 to cool the brushless motor 5, reaches the fan housing chamber 52, and is discharged to the outside from the air outlet 54 through the air discharge passage 55. Since the air inlet 57 and the air outlet 54 are vertically separated from each other on the front surface of the lower connecting portion 18, the exhaust gas from the air outlet 54 is less likely to be sucked through the air inlet 57.

In addition, since the air inlet 57 and the air outlet 54 are open on the front surface of the lower connecting portion 18, the air inlet 57 and the air outlet 54 do not directly contact the floor surface or the like even if the mixer 1 is placed on the floor surface or the like. Therefore, the possibility of foreign matter and the like entering from the air inlet 57 and the air outlet 54 is reduced.

Even if the material to be stirred adheres to the outer surfaces of the motor housing portion 3 and the handle 4 due to the stirring work, the flow of the material to be stirred into the air inlet 57 and the air outlet 54 can be prevented by the stopper rib 59 provided in the lower connecting portion 18. Therefore, the material to be stirred is less likely to flow along the surface of the lower connecting portion 18 and enter through the air inlet 57 and the air outlet 54.

Further, since the protective plate 12 is formed so as to cover the entire formation region of the exhaust port 54 in front view and to cover a part of the upper side of the formation region of the air inlet 57 (overlap in the front-rear direction), the possibility that the material to be stirred, which is splashed during the stirring operation, reaches the air inlet 57 and the exhaust port 54 is also reduced.

On the other hand, in the battery mounting portion 17, since the entire battery pack 23 is covered with the battery cover 28, there is no possibility that the material to be stirred adheres to the battery pack 23 or enters the terminal block 24 side. When the battery cover 28 is opened, as shown in fig. 6, the front surface of the battery pack 23 can be seen from the rear by the mirror 33 provided on the bottom surface of the battery cover 28. Therefore, the remaining capacity display portion (not shown) provided on the front surface of the battery pack 23 can be easily visually confirmed without tilting the mixer 1 or bending the body of the operator.

As described above, according to the above-described agitator 1, the motor (brushless motor 5) of the housing (main body housing 2) is provided with: an air inlet 57 for sucking the outside air by the rotation of the fan (centrifugal fan 49); and an exhaust port 54 for sucking air by the rotation of the centrifugal fan 49, so that foreign matters and the like can be prevented from entering from the air inlet 57 and the exhaust port 54 even if a cover using sponge or metal net is not provided. Therefore, the cost increase can be suppressed, and the cooling effect of the brushless motor 5 can be maintained because the ventilation resistance is not generated by the cover. Further, since maintenance required for installing the cover is not required, usability is improved. Further, since the air inlet 57 and the air outlet 54 can be disposed in a concentrated manner in the lower connecting portion 18, the uniformity of design is also improved.

In particular, since the stopper rib 59 is provided on the side surface of the main body casing 2, and the stopper rib 59 is provided to suppress the movement of the material to be kneaded adhering to the side surface toward the air inlet 57 and the air outlet 54, the material to be kneaded can be effectively suppressed from entering from the main body casing 2 toward the air inlet 57 and the air outlet 54.

Further, the air inlet 57 and the air outlet 54 are provided on the front surface of the main body casing 2, and the protective plate 12 is attached to the front of the main body casing 2, so that a part of the formation region of the air inlet 57 and the entire formation region of the air outlet 54 are covered with the protective plate 12 in the front view, and therefore, the intrusion of the material to be stirred into the air inlet 57 and the air outlet 54 can be more effectively suppressed.

In the mixer 1, the battery pack 23 is disposed at the lower portion of the main body casing 2, and therefore, the center of gravity is located at the lower side, so that the balance of the main body casing 2 is improved, and the operability is improved. In particular, since the control circuit board 26 is disposed above the battery pack 23, a more stable feeling can be obtained.

In addition, since the battery pack 23 is disposed at the lower portion of the ring-shaped handle 4, the wiring inside the handle 4 is also facilitated.

The number, shape, and formation area of the air inlets and the air outlets are not limited to the above embodiments. For example, in the above-described embodiment, the centrifugal fan is provided on the front side of the stator, the exhaust port is disposed on the upper side, and the intake port is disposed on the lower side, but the centrifugal fan may be provided on the rear side of the stator, the exhaust port is disposed on the lower side, and the intake port is disposed on the upper side. In addition, when the air inlet and the air outlet are adjacent to each other, the openings may be formed so as to be inclined in opposite directions to each other in the thickness direction of the casing. The fan is not limited to the centrifugal fan.

The formation region of the intake port and the exhaust port is not limited to the front surface of the casing, and may be other regions such as the rear surface of the lower coupling portion, as long as the regions are regions other than the side surfaces.

On the other hand, the shape of the lower connecting portion is not limited to the above-described form, and the air inlet and the air outlet can be formed in the front surface even if the lower connecting portion is linear and extends in the vertical direction without being inclined. The shape of the barrier rib may be changed or the barrier rib may be omitted.

In addition, other configurations are conceivable, such as a configuration in which the battery mounting portion and the controller are not tilted forward and downward, a configuration in which the hinge of the battery cover is reversed forward and backward, or a configuration in which the battery cover is made transparent so that the presence or absence of the battery pack can be easily visually checked. The battery cover itself may also be omitted. The motor may be a motor other than a brushless motor.