Power work machine

Abstract

To prevent a foreign matter from getting sucked through an air intake port.SOLUTION: A power work machine according to one aspect of the present invention comprises a working part, a driving part, a main body part, and a blowing part. The working part works on an object to be worked. The driving part drives the working part. The main body part has a bottom surface portion, an air intake port, and an exhaust port and forms a storage space for storing the driving part and a ventilation flue extending from the air intake port through the storage space to the exhaust port. The blowing part makes the ventilation flue generate airstream flowing toward the exhaust port. The air intake port opens in a direction in which there are components pointing downward vertically, in a first state where the power work machine is installed with the bottom surface portion pointed to a horizontal surface.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power working machine. [Background technology]

[0002] Patent Document 1 discloses a technique for a chainsaw in which a motor is installed in a cooling route inside a main body case, in which an intake port communicating with the cooling route opens into the main body case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-30313 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology of Patent Document 1, air is drawn in from the side of the main body case, so foreign matter such as chips generated during work using a chainsaw can easily get inside.

[0005] In view of the above circumstances, the present invention is designed to make it difficult for foreign matter to be sucked in through the intake port. [Means for solving the problem]

[0006] (1) According to one aspect of the present invention, there is provided a power working machine. The power working machine includes a working unit, a drive unit, a main body, and a blower unit. The working unit acts on a work object. The drive unit drives the working unit. The main body has a bottom surface, an intake port, and an exhaust port, and forms a storage space for storing the drive unit and a ventilation path that runs from the intake port through the storage space to the exhaust port. The blower unit generates an airflow in the ventilation path that flows toward the exhaust port. In a first state in which the power working machine is placed with the bottom surface facing a horizontal plane, the intake port opens in a direction that has a vertically downward component.

[0007] According to this aspect, it is possible to make it difficult for foreign matter to be sucked in through the intake port. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram showing the overall configuration of a chainsaw 1. FIG. [Figure 2] FIG. 1 is a diagram showing the appearance of a chain saw 1. [Figure 3] FIG. 1 is a diagram showing the chainsaw 1 as seen from the front. [Figure 4] FIG. 1 is a diagram showing the chainsaw 1 as viewed from above. [Figure 5] FIG. 2 is a diagram showing the chainsaw 1 as seen from below. [Figure 6] FIG. 4 is a view taken along the arrow AA in FIG. [Figure 7] FIG. 2 is a diagram showing the chainsaw 1 as seen from behind. [Figure 8] FIG. 6 is a view taken along the arrow BB shown in FIG. 5. [Figure 9] 9 is an enlarged view of the ventilation passage 20 shown in FIG. 8. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. Various features shown in the following embodiments can be combined with each other.

[0010] <Embodiment> In this embodiment, a chainsaw for cutting trees, boards, etc. will be described as an example of a power working machine according to the present invention.

[0011] FIG. 1 is a block diagram showing the overall configuration of a chainsaw 1. The chainsaw 1 includes a main body 2, a working unit 3, a control unit 4, a drive unit 5, a blower unit 6, and a battery 7. The main body 2 has a housing 21 and an air intake unit 22. The housing 21 is a box-shaped portion that holds the other units. The housing 21 stores the control unit 4, drive unit 5, and blower unit 6 in a storage space 211 provided therein, and also stores and holds an operation reception unit 42. The housing 21 also holds the working unit 3 exposed to the outside and holds the battery 7 in a detachable manner.

[0012] The housing 21 defines an internal ventilation passage 20 through which cooling air flows to cool the control unit 4 and the drive unit 5 (particularly the motor). The intake unit 22 is attached to the housing 21 and defines the intake port 221 side of the ventilation passage 20. The housing 21 has a handle unit 23. The handle unit 23 is a handle that an operator grips when using the chainsaw 1 to perform work, and has a lever 43. When an operator grips the handle unit 23 and operates the lever 43, the operation receiving unit 42 sends an ON signal to the control unit 4. When an operator uses the chainsaw 1 to perform work, the working unit 3 comes into contact with the work object and acts directly on the work object. In this embodiment, the work object is a tree, a board, or the like, and the working unit 3 acts to cut them.

[0013] The control unit 4, drive unit 5, and operation reception unit 42 all operate using power supplied from the battery 7. The operation reception unit 42 is provided inside the housing 21 on the handle unit 23 side, and receives operations from the worker when the worker operates the lever 43. The control unit 4 controls the operation of the drive unit 5 based on a signal transmitted from the operation reception unit 42 when the worker grips the lever 43. The control unit 4 is also provided on a control board, and further includes an IC circuit (Integrated Circuit) and the like, and generates and transmits control signals. The drive unit 5 includes a motor, a sprocket, and the like, and rotates the motor by switching an inverter (not shown) based on a drive signal from the control unit 4, thereby driving the working unit 3.

[0014] The blower 6 is a fan that is attached to a motor provided in the aforementioned ventilation passage 20, and when the motor rotates, the fan rotates to generate an air current that serves as cooling air that cools heat-generating components (controller 4 and drive unit 5) that generate heat when the chainsaw 1 is operated. This cooling air is, for example, drawn in from the intake port 221 of the intake unit 22 attached to the main body 2, passes through the ventilation passage 20 on the inlet side, cools the heat-generating components stored in the storage space 211, and is then discharged from the exhaust port 25.

[0015] FIG. 2 is a diagram showing the appearance of the chainsaw 1. FIG. 2 shows the chainsaw 1 as seen from the left. As shown in FIG. 2, the chainsaw 1 has defined up-down, front-rear, and left-right directions. In this embodiment, the up-down direction of the chainsaw 1 is defined as the vertical direction when the chainsaw 1 is placed on a flat, horizontal installation surface. The front-rear direction is defined as a direction perpendicular to the up-down direction, and the left-right direction is defined as a direction perpendicular to both the up-down and front-rear directions. The front-rear direction and left-right directions will be explained in detail later.

[0016] 2 shows the main body 2, working unit 3, and battery 7. The working unit 3 includes a guide bar 31 and a saw chain 32. The guide bar 31 is a plate-shaped member extending in the front-to-rear direction, and the rear end of the guide bar 31 is attached to the main body 2. A ring-shaped saw chain 32 is wound around the outer periphery of the guide bar 31. The saw chain 32 is engaged with a drive gear of the drive unit 5 shown in FIG. 1.

[0017] The drive gear is driven to rotate by a motor included in the drive unit 5. The control unit 4 shown in FIG. 1 executes a control process to control the rotation of the motor when the operator operates a lever 43. The battery 7 has an elongated shape, and supplies power to the control unit 4, drive unit 5, etc. when inserted into and held in the main body 2. With the above configuration, when the operator operates the lever 43, the motor controlled by the control unit 4 rotates the sprocket, and this rotational power rotates the saw chain 32 along the outer periphery of the guide bar 31.

[0018] FIG. 2 shows the housing 21, intake section 22, and handle section 23 of the main body 2, as well as the bottom section 24. The bottom section 24 is the portion that comes into contact with the installation surface when the chainsaw 1 is placed on the flat installation surface. In this embodiment, the bottom section 24 includes a flat surface that comes into contact with the installation surface. However, the bottom section 24 may have a shape that contacts the installation surface at multiple edges or points, as long as the chainsaw 1 is stable when placed on the installation surface. Hereinafter, the state in which the chainsaw 1 is placed with the bottom section 24 facing a horizontal plane is referred to as the horizontal installation state. The horizontal installation state is an example of the "first state" of the present invention. In the horizontal installation state, the up-down direction of the chainsaw 1 coincides with the vertical direction.

[0019] The intake unit 22 has an intake port 221 and forms the inlet side of the ventilation path formed inside the main body unit 2, i.e., the intake port 221 side. The ventilation path formed by the intake unit 22 and the ventilation path formed by the housing 21 are connected inside the main body unit 2, forming a ventilation path from the entrance (intake port 221) to the exit (exhaust port, described later). The control unit 4 and the motors of the drive unit 5, etc., are arranged in the storage space 211 shown in Fig. 1 along this ventilation path, and are cooled by the cooling air drawn in from the intake port 221.

[0020] Furthermore, intake unit 22 has a front fixing portion 222-1 and a rear fixing portion 222-2 (when there is no need to distinguish between them, they will be referred to as "fixing portion 222"). Fixing portion 222 is a hole for inserting a screw or the like to fix intake unit 22 to housing 21. Fixing portion 222-1 also serves as a fixing portion for fixing handle portion 23 to housing 21. In this way, intake unit 22 is detachable from housing 21.

[0021] The handle unit 23 has a front handle 231, a rear handle 232, and a hand guard 233. The front handle 231 is provided on the front side of the main body 2, and the rear handle 232 is provided on the rear side of the main body 2. Both the front handle 231 and the rear handle 232 are gripped (held) by the operator when performing electric work. Regardless of the direction in which the operator is turning the work object, the operator operates the lever 43 while gripping the rear handle 232 to perform the work. The hand guard 233 is a part that protects the hand gripping the front handle 231 from branches and the like. The hand guard 233 may also function as a brake lever that stops the drive unit 5.

[0022] As described above, the operator grips the front handle 231 and the rear handle 232, lifts the chainsaw 1, and rotates the saw chain 32 to perform work on a work object such as a tree. In the chainsaw 1, the side of the working unit 3 where work on the work object is performed is defined as the front, and the side of the main body unit 2 that is gripped by the operator during work is defined as the rear, and the directions pointing forward and backward are defined as the front-to-back direction. In addition, the directions facing left and right when looking forward from the rear are defined as the left-to-right direction.

[0023] Figure 3 is a diagram showing the chainsaw 1 as seen from the front. As shown in Figure 3, the front handle 231 has a first handle portion 2311 and a second handle portion 2312. The first handle portion 2311 is provided above the housing 21 and spaced apart from the housing 21, and the second handle portion 2312 is provided to the left of the housing 21 and spaced apart from the housing 21. The operator switches between holding the first handle portion 2311 and the second handle portion 2312 depending on whether the object to be cut is to be cut vertically or horizontally.

[0024] When cutting a work object vertically, the operator holds the first handle portion 2311 with one hand and the rear handle 232 with the other hand, and operates the operation receiving unit 42 to rotate the saw chain 32 vertically. When cutting a work object horizontally, the operator holds the second handle portion 2312 with one hand and the rear handle 232 with the other hand, tilts the chainsaw 1 sideways, and operates the operation receiving unit 42 to rotate the saw chain 32 sideways.

[0025] Fig. 4 is a diagram showing the chainsaw 1 as viewed from above. In Fig. 4, a center line A1 indicating the center of the rear handle 232 in the left-right direction is indicated by a two-dot chain line. The intake unit 22 is provided on the left-facing side surface of the housing 21. This side surface is the left end of the housing 21, and in the main body 2, it is located to the left of the center (center line A1) of the rear handle 232 in the left-right direction. In other words, the intake unit 22 is provided to the left of the center of the rear handle 232 in the left-right direction. Meanwhile, the working unit 3 is provided to the right of the center of the rear handle 232 in the left-right direction.

[0026] Figure 5 is a diagram showing the chainsaw 1 as seen from below. In Figure 5, the center line A1, which indicates the center of the rear handle 232 in the left-right direction, is also shown by a two-dot chain line. As described above, the working unit 3 is provided to the right of the center of the rear handle 232 in the left-right direction. More specifically, the saw chain 32 and guide bar 31 of the working unit 3 are provided to the right of the center of the rear handle 232 in the left-right direction. Meanwhile, the intake port 221 of the intake unit 22, like the intake unit 22, is provided to the left of the center of the rear handle 232 in the left-right direction.

[0027] Note that working unit 3 may be provided to the left of center line A1, in which case intake port 221 may be provided to the right of center line A1. In other words, working unit 3 may be provided to the right or left of the center of rear handle 232 in the left-right direction, and intake port 221 may be provided on the opposite side of working unit 3 from the center of rear handle 232 in the left-right direction. According to this embodiment, it is possible to make it less likely for foreign matter such as cutting chips to be sucked in through intake port 221 than when both working unit 3 and intake port 221 are provided on the right or left side.

[0028] The housing 21 has an exhaust port 212 that opens downward. The exhaust port 212 is an outlet through which cooling air that is taken in from the intake port 221 and has cooled heat-generating components such as the motor of the drive unit 5 disposed inside the main body 2 passes through the ventilation passage 20 formed inside the housing 21 and is discharged to the outside.

[0029] Moreover, exhaust port 212 is provided between working unit 3 and intake port 221. According to this embodiment, foreign matter such as chips generated during work can be moved away from intake port 221 by the air discharged from exhaust port 25, thereby preventing the foreign matter from flowing into intake port 221. Furthermore, by setting the direction of the air discharged from exhaust port 25 to have a component in the left-right direction from exhaust port 25 toward working unit 3 (the rightward direction in FIG. 5), foreign matter such as chips can be pushed back toward working unit 3 by the exhaust air, making it more difficult for the foreign matter to enter intake port 221.

[0030] Fig. 6 is a view taken along the arrow AA in Fig. 3. As shown in Fig. 6, the housing 21 of the main body 2 has a storage space 211 that stores the drive unit 5. The main body 2 forms an air passage 20 that runs from the air intake 221 shown in Fig. 5 through the storage space 211 to the air exhaust 212. The air blower 6 shown in Fig. 1 is provided in the air passage 20. The air blower 6 generates an air current (also called cooling air) in the air passage 20 that flows toward the air exhaust 212. The shape of the air passage 20 from the air intake 221 to the storage space 211 will be described with reference to the next figure and onwards.

[0031] 7 is a diagram showing the chainsaw 1 as seen from the rear. As described above, the intake section 22 has a front fixing portion 222-1 and a rear fixing portion 222-2 for fixing the intake section 22 to the housing 21. The intake section 22 is fixed to the left side surface 213 of the housing 21 by screwing screws or the like into these fixing portions 222.

[0032] Fig. 8 is a view seen from the arrow BB shown in Fig. 5. Air intake section 22 forms ventilation passage 20 beyond air intake port 221. Details of ventilation passage 20 will be described with reference to Fig. 9.

[0033] Fig. 9 is an enlarged view of the ventilation passage 20 shown in Fig. 8. In Fig. 9, the ventilation passage 20 is shown hatched to make it easier to understand. The ventilation passage 20 has an intake port 221, a first passage 223, a narrowed portion 226, a second passage 224, and a third passage 225, and begins with the intake port 221 and continues in this order. The back of the third passage 225 is connected to the storage space 211 shown in Fig. 6.

[0034] In the horizontal installation state described above, intake port 221 of intake unit 22 opens in a direction having a vertically downward component. More specifically, if the boundary between the internal space of intake unit 22 and external space 9 is taken as the opening plane, the orientation of intake port 221 is represented by the normal to the opening plane on the external space 9 side. If the opening plane is a single plane, the direction of the normal will also be uniform, and the direction of the normal will be the orientation of intake port 221.

[0035] Note that the opening surface may be formed to include two or more flat or curved surfaces, in which case there will be two or more normal directions. Even in this case, it is sufficient that the two or more normals indicating the orientation of intake port 221 all have a vertically downward component. Furthermore, intake port 221 may have a vector formed by combining unit vectors indicating the two or more normals, each of which has a vertically downward component. According to this aspect, it is possible to make it less likely for foreign matter such as chips to be sucked into intake port 221 than when intake port 221 opens in the horizontal direction when installed horizontally.

[0036] In a horizontal installation state, the first passage 223 extends from the intake port 221 in a first direction D1 that includes a vertically upward component. In contrast, the second passage 224 is connected to the first passage 223 and extends in a second direction D2 that forms a predetermined angle with the first direction D1. The angle formed by the two directions here refers to the angle formed by vectors that indicate the two directions when their starting points are aligned. In this embodiment, the first direction D1 is an upward direction, and the second direction D2 is a rightward direction. Therefore, the predetermined angle formed by the first direction D1 and the second direction D2 is 90 degrees.

[0037] If the orientation during work is close to a horizontal installation state, even if a foreign object enters the air intake 221, it will have to travel further up the first passage 223, so the foreign object is unlikely to penetrate further inside. However, depending on the work situation, the chainsaw 1 may tilt, reducing the upward gradient of the first passage 223 and making it easier for foreign objects to penetrate further inside. Even in this case, if the second direction D2 then approaches an upward direction, foreign objects will be less likely to penetrate deep into the second passage 224. Thus, according to this embodiment, it is possible to make it less likely for foreign objects to penetrate deep into the ventilation passage 20 when the orientation of the chainsaw 1 changes during work.

[0038] The predetermined angle formed by the first direction D1 and the second direction D2 may be less than 90 degrees or greater than 90 degrees. However, if the predetermined angle is too small, foreign matter that has entered the first passage 223 will likely also enter the second passage 224. Also, if the predetermined angle is too large, the resistance to generating airflow in the ventilation passage 20 will increase, resulting in increased power consumption by the blower unit 6. Therefore, it is desirable that the predetermined angle be around 90 degrees.

[0039] The third passage 225 is connected to the second passage 224 and extends in a third direction D3 that forms a predetermined angle with the first direction D1 and the second direction D2. In this embodiment, the third direction D3 is a forward direction. Therefore, the angles formed by the first direction D1 and the second direction D2 and the third direction D3 are all 90 degrees. This makes it difficult for foreign objects to get deep into the ventilation passage 20 when the orientation of the chainsaw 1 changes during work, just as in the case of the second passage 224.

[0040] Furthermore, the narrowed portion 226 is provided in the ventilation passage 20, and is a portion having a reduced cross-sectional area compared to the front and rear ventilation passages 20. In the present embodiment, the narrowed portion 226 is provided between the first passage 223 and the second passage 224, and has a reduced cross-sectional area compared to the front and rear ventilation passages 20 (the first passage 223 and the second passage 224). According to this aspect, foreign matter entering through the air intake port 221 is easily caught by the narrowed portion 226, and therefore, it is possible to make it difficult for foreign matter to enter beyond the narrowed portion 226.

[0041] <Other embodiments> In the embodiment, a chainsaw has been described as an example of a power tool, but the present invention is not limited to this. For example, a hedge trimmer, an engine cutter, etc. may also be used. Also, while the chainsaw is an electric tool with a drive unit 5 having a motor, the drive unit 5 may also be a tool with an internal combustion engine. In short, any power tool may be used as long as it has a drive unit that requires cooling inside the main body.

[0042] In the embodiment, the restrictor 226 is provided in the ventilation passage 20, but a filter may be provided in addition to or instead of the restrictor 226. In either case, it is possible to make it difficult for foreign matter to enter beyond the filter. The filter may also be provided in the restrictor 226. In this case, the cross-sectional area of ​​the filter attachment position is smaller than in other locations, so the air resistance caused by the filter is smaller than when the filter is provided in other locations, and the energy consumption of the blower 6 can be reduced.

[0043] The filter may be provided in the first passage 223, the second passage 224, or the third passage 225. The filter may also be provided in the ventilation path 20 inside the housing 21. However, it is desirable that the filter be provided in the intake unit 22. The intake unit 22 is part of the main body 2, but is detachable from the housing 21. The intake unit 22 forms at least the ventilation path 20 from the intake port 221 to the filter, which makes filter replacement easier than when the filter is provided inside the housing 21.

[0044] Furthermore, the shape of the ventilation passage 20 is not limited to that described in the embodiment. For example, in the embodiment, the second direction D2 in which the second passage 224 extends is a rightward direction, but the second direction D2 may be a leftward direction. Also, the third direction D3 in which the third passage 225 extends is a forward direction, but the third direction D3 may be a rearward direction. In either case, if the direction of the chainsaw 1 changes during work and the upward gradient of the first passage 223 decreases, the other passages will have an upward gradient, making it easier to prevent foreign matter from entering.

[0045] Furthermore, a fourth passageway extending in the opposite fourth direction (leftward) may be provided after the second passageway 224 extending in the second direction D2 (rightward). In this way, whether the chainsaw 1 is tilted to the left or right, either the second passageway 224 or the fourth passageway will have an uphill slope, which further reduces the intrusion of foreign matter.

[0046] Furthermore, the handle portion 23 is positioned so as to be easy to grip in accordance with the orientation of the chainsaw 1. Therefore, the ventilation passage 20 may be formed in accordance with the position of the handle portion 23. For example, as in the embodiment, the chainsaw 1 is assumed to include a first handle portion 2311 and a second handle portion 2312.

[0047] As described above, the state in which the first handle portion 2311 is gripped by the operator during operation is a state in which the saw chain 32 rotates vertically, and is hereinafter referred to as the "vertical rotation state." More specifically, the vertical rotation state refers to the state in which the chainsaw 1 is maintained when only the first handle portion 2311 is supported. To make operation easier for the operator, the chainsaw 1 is designed so that the front-to-back direction is nearly horizontal when only the first handle portion 2311 is supported. However, this is not always completely horizontal; for example, the front may be slightly raised. Therefore, the vertical rotation state may or may not coincide with the horizontal installation state described in the embodiment.

[0048] On the other hand, when the operator grips the second handle portion 2312 to perform work, as described above, the saw chain 32 rotates horizontally, and this state will be referred to as the "horizontal rotation state" hereinafter. More specifically, the horizontal rotation state refers to the state that the chainsaw 1 maintains when only the second handle portion 2312 is supported. The vertical rotation state is an example of the "first gripping state" of the present invention, and the horizontal rotation state is an example of the "second gripping state" of the present invention.

[0049] The first passage 223 may be provided to extend from the intake port 221 in a second direction including a vertically upward component in the vertically rotated state (first holding state), and the second passage 224 may be provided to extend in a third direction including a vertically upward component in the horizontally rotated state (second holding state). When the vertically rotated state coincides with the horizontally installed state, the second direction coincides with the first direction described above.

[0050] According to this aspect, foreign matter that has entered the ventilation passage can be more easily prevented from penetrating further into the passage, regardless of whether the first handle portion 2311 or the second handle portion 2312 is gripped. Note that the "direction including a vertically upward component" simply means a direction that is even slightly vertically upward, and the closer this direction is to being vertically upward (forming an angle of 90 degrees with the horizontal plane), the easier it is to prevent foreign matter from penetrating further into the ventilation passage.

[0051] <Additional Notes> Furthermore, it may be provided in the following aspects.

[0052] (2) In the power working machine, the main body has a rear handle, the working part is located to the right or left of the center of the rear handle in the left-right direction, and the air intake is located on the opposite side of the center from the working part.

[0053] According to this aspect, it is possible to make it difficult for foreign matter to be sucked in through the intake port.

[0054] (3) In the power working machine, the ventilation passage has a first passage and a second passage, and in the first state, the first passage extends from the intake port in a first direction that includes a vertically upward component, and the second passage is connected to the first passage and extends in a second direction that forms a predetermined angle with the first direction.

[0055] According to this aspect, even if the orientation of the power working machine changes during operation, foreign matter is less likely to get into the depths of the ventilation passage.

[0056] (4) In the power working machine, the main body has a first handle portion and a second handle portion, and the first passage extends in a direction including a vertically upward component from the intake port in a first gripping state in which the first handle portion is gripped by the operator to perform work, and the second passage extends in a direction including a vertically upward component in a second gripping state in which the second handle portion is gripped by the operator to perform work.

[0057] According to this aspect, regardless of which handle portion is gripped, it is possible to easily prevent foreign matter that has entered the ventilation passage from penetrating further into the passage.

[0058] (5) In the power working machine, the main body has a narrowing portion in the ventilation passage where the cross-sectional area is reduced compared to the front and rear.

[0059] According to this aspect, it is possible to make it difficult for foreign matter to enter beyond the narrowed portion.

[0060] (6) The power working machine is provided with a filter provided in the throttle section.

[0061] According to this aspect, the energy consumption of the blower can be reduced compared to when a filter is provided in another location.

[0062] (7) In the power working machine, a portion of the main body is detachable, and the portion forms at least the ventilation path from the air intake to the filter.

[0063] According to this aspect, filter replacement can be facilitated. Of course, this is not the case. Furthermore, the above-described embodiments and modifications may be combined in any desired manner.

[0064] Finally, while various embodiments of the present invention have been described, these are presented by way of example only and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. The embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the appended claims. [Explanation of symbols]

[0065] 1: Chainsaw 2: Main body 3: Working section 4: Control section 5: Drive unit 6: Blower 7: Battery 9: External space 20:Ventilation path 21: Housing 22: Intake section 23: Handle 24: Bottom part 25: Exhaust port 31: Guide bar 32: Saw chain 42: Operation reception section 43: Lever 211: Storage space 212: Exhaust port 213: Left side 221: Air intake 222:Fixed part 222-1:Fixed part 222-2:Fixed part 223: 1st aisle 224: 2nd aisle 225: 3rd aisle 226: Constriction section 231: Front handle 232: Rear handle 233: Handguard 2311: First handle part 2312: Second handle part

Claims

1. A power working machine, The device includes a working unit, a driving unit, a main body unit, and a blower unit, The working unit acts on a work object, the drive unit drives the working unit, the main body portion has a bottom surface portion, an air intake port, and an air exhaust port, and forms a storage space that stores the drive unit, and a ventilation path that leads from the air intake port through the storage space to the air exhaust port; The blower generates an airflow in the ventilation path that flows toward the exhaust port, the intake port opens in a direction having a vertically downward component in a first state in which the power working machine is placed with the bottom surface facing a horizontal plane, The ventilation passage has a first passage and a second passage, an end portion of the first passage that is located at a vertically lower end in the first state serves as the intake port, and in the first state, the first passage extends from the intake port in a first direction that includes a vertically upward component; the second passage is connected to an end portion of the first passage that is positioned at a vertically upper end in the first state, and extends in a second direction that forms a predetermined angle with the first direction; The blower is provided at the back of the second passage on the downstream side, The air passing through the first passage and the second passage reaches the blower section, the main body portion has a throttle portion between the first passage and the second passage of the ventilation passage, the throttle portion having a cross-sectional area that is smaller than that of the front and rear portions, A filter is provided in the throttle portion.

2. The power working machine according to claim 1, A portion of the main body is detachable, and the portion forms at least the ventilation path from the air intake port to the filter.

3. The power working machine according to claim 1 or 2, The ventilation passage further includes a third passage, the third passage is connected to a downstream end of the second passage and extends in a third direction that forms a predetermined angle with the first direction and the second direction, The blower is provided at the rear of the downstream side of the third passage, The air passing through the first passage, the second passage, and the third passage reaches the blower section.

4. The power working machine according to any one of claims 1 to 3, The main body has a rear handle, The working unit is provided on the right or left side of the center of the rear handle in the left-right direction, The air intake is provided on the opposite side of the center from the working unit.

5. The power working machine according to claim 4, The main body portion has a first handle portion and a second handle portion, the first passage extends in a direction including a vertically upward component from the intake port in a first grip state in which the first handle portion is gripped by an operator to perform work, The second passage extends in a direction that includes a vertically upward component in a second gripping state in which the second handle portion is gripped by an operator for operation.

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