working machine

Abstract

The present application provides a work machine capable of sufficiently cooling a control device. The work machine can include a work portion, an electric motor, a control device, a housing that houses the electric motor and the control device, an air intake port and an air exhaust port that communicate an inside of the housing with an outside, a cooling air passage that is formed in the inside of the housing and that transports air that flows into the air intake port toward the air exhaust port, and a fan that generates cooling air that flows from the air intake port through the cooling air passage toward the air exhaust port. The control device can include a first surface and a second surface that are in positive and negative relation to each other. The cooling air passage can include a first passage portion that faces the first surface of the control device and a second passage portion that faces the second surface of the control device. The first passage portion and the second passage portion can be connected in series with each other. The cooling air can flow through the second passage portion after flowing through the first passage portion. A flow rate of the cooling air that flows through the first passage portion and a flow rate of the cooling air that flows through the second passage portion can be substantially equal.

Description

Technical Field

[0001] The technology disclosed in this specification relates to work machines. Background Technology

[0002] Patent Document 1 discloses a work machine comprising: a work section; an electric motor driving the work section; a control device controlling the electric motor; a housing housing the electric motor and the control device; an air intake and an exhaust port communicating the interior and exterior of the housing; a cooling air passage formed inside the housing, supplying air flowing into the air intake to the exhaust port; and a fan generating cooling air flowing from the air intake through the cooling air passage to the exhaust port. The control device has a first side and a second side facing each other. The cooling air passage has a first passage portion facing the first side of the control device and a second passage portion facing the second side of the control device. The first passage portion and the second passage portion are connected in parallel. A portion of the cooling air flows in the first passage portion, and the remainder flows in the second passage portion.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-085970 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In the machine described in Patent Document 1, cooling air flows through a first passage section and a second passage section, thereby cooling both sides of the control device (i.e., the first surface and the second surface). However, since the first passage section and the second passage section are connected in parallel, when the flow rate of the cooling air flowing through the first passage section (i.e., the first flow rate) increases, the flow rate of the cooling air flowing through the second passage section (i.e., the second flow rate) decreases accordingly. Conversely, when the second flow rate increases, the first flow rate decreases accordingly. Thus, the first flow rate and the second flow rate are in an inverse relationship, making it difficult to increase both the first flow rate and the second flow rate. As a result, the control device may not be adequately cooled. In this specification, a technique is provided that can adequately cool the control device.

[0008] Solution for solving the problem

[0009] The work machine disclosed in this specification may include: a work section; an electric motor that drives the work section; a control device that controls the electric motor; a housing that houses the electric motor and the control device; an air intake and an exhaust port that connect the interior and exterior of the housing; a cooling air passage formed inside the housing that directs air flowing into the air intake to the exhaust port; and a fan that generates cooling air flowing from the air intake through the cooling air passage to the exhaust port. The control device may also have a first side and a second side that are opposite to each other. The cooling air passage may also have a first passage portion facing the first side of the control device and a second passage portion facing the second side of the control device. The first passage portion and the second passage portion may also be connected in series. The cooling air flows through the first passage portion and then flows in the second passage portion. The flow rate of the cooling air flowing in the first passage portion and the flow rate of the cooling air flowing in the second passage portion may also be approximately equal.

[0010] The effects of the invention

[0011] According to the above structure, since the first passage section and the second passage section are connected in series, the flow rate of the cooling air flowing in the first passage section (i.e., the first flow rate) is approximately equal to the flow rate of the cooling air flowing in the second passage section (i.e., the second flow rate). Therefore, the first flow rate and the second flow rate are not inversely related, thus both the first flow rate and the second flow rate can be increased. As a result, the cooling control device can be adequately cooled. Attached Figure Description

[0012] Figure 1 This is a diagram showing the chainsaw 2 of the embodiment viewed from the upper right front.

[0013] Figure 2 This is a diagram showing the chainsaw 2 of the embodiment viewed from the right.

[0014] Figure 3 This is a diagram showing the internal structure of the chainsaw 2 in the embodiment, viewed from the left.

[0015] Figure 4 This is a view of the vicinity of the sprocket cover 10 of the chainsaw 2 in the embodiment, viewed from the upper right front.

[0016] Figure 5 This is a view of the vicinity of the sprocket 16 of the chainsaw 2 in the embodiment, viewed from the upper right front.

[0017] Figure 6 This is a diagram showing the front handle 36, tool 72, and retainer 80 of the chainsaw 2 in the embodiment.

[0018] Figure 7The diagram shows the tool 72 and retainer 80 of the chainsaw 2 in the embodiment, viewed from a cross section orthogonal to the left and right directions.

[0019] Figure 8 This is a view of the vicinity of the multiple air intakes 100 of the chainsaw 2 in the embodiment, viewed from the upper left rear.

[0020] Figure 9 This is a view of the vicinity of the filter 102 of the chainsaw 2 in the embodiment, viewed from the upper left rear.

[0021] Figure 10 This is a diagram showing the filter 102 of the chainsaw 2 in the embodiment, viewed from the upper right rear.

[0022] Figure 11 This is a view of the lower surface of the main body 18 of the chainsaw 2 in the embodiment, viewed from the lower left front.

[0023] Figure 12 This is a diagram of the cooling air passage 190 of the chainsaw 2 in the embodiment, viewed from a cross section orthogonal to the front and rear directions.

[0024] Figure 13 This is a view of the control device 120 of the embodiment from above.

[0025] Figure 14 This is a perspective cross-sectional view of the upper passage portion 190a of the cooling air passage 190 of the chainsaw 2 in the embodiment.

[0026] Figure 15 This is a diagram showing the control device 120 of the embodiment viewed from below.

[0027] Figure 16 This is a diagram showing the situation where the depth limiter 200 is attached to or detached from the guide rod 6 according to the embodiment.

[0028] Figure 17 This is a diagram showing the situation where the depth limiter 200 is attached to or detached from the guide rod 6 according to the embodiment.

[0029] Figure 18 This is a diagram showing the situation where the depth limiter 200 is attached to or detached from the guide rod 6 according to the embodiment.

[0030] Figure 19 This is a diagram showing the situation where the depth limiter 200 is attached to or detached from the guide rod 6 according to the embodiment.

[0031] Figure 20 This is a diagram showing the situation where the depth limiter 200 is attached to or detached from the guide rod 6 according to the embodiment.

[0032] Figure 21 This is a diagram showing the chainsaw 2 of the embodiment with the cover 270 installed on the guide rod 6, viewed from the upper right front.

[0033] Figure 22 This is a diagram showing the cover 270 of the embodiment viewed from the upper right front. Detailed Implementation

[0034] Hereinafter, representative and non-limiting examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description is merely intended to present to those skilled in the art the details of preferred embodiments for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, the disclosed additional features and technical solutions can be used separately or in conjunction with other features and technical solutions to provide a further improved working machine.

[0035] Furthermore, the features and combinations of processes disclosed in the following detailed description are not essential for carrying out the invention in the broadest sense, but are only described to specifically illustrate representative examples of the invention. Moreover, when providing additional and useful embodiments of the invention, the various features of the following representative examples and the various features of the technical solutions described in the claims are not necessarily combined as in the examples described herein or in the order listed.

[0036] All features recited in this specification and / or claims are intended to be disclosed separately and independently of the structure of the features recited in the embodiments and / or claims, as a disclosure of the original application and a limitation of the specific matters recited in the claims. Furthermore, all numerical ranges and descriptions relating to groups or sets are intended to disclose their intermediate structures as a disclosure of the original application and a limitation of the specific matters recited in the claims.

[0037] In one or more embodiments, the cooling air passage may further include a third passage portion passing through the interior of the electric motor. The cooling air may also flow in the first passage portion, and after flowing through the second passage portion, flow in the third passage portion.

[0038] Based on the above structure, the cooling air can not only cool the control device, but also the electric motor.

[0039] In one or more embodiments, the machine may also include a motor housing surrounding the outer peripheral surface of the electric motor. The control device may also be configured such that its second surface faces the motor housing.

[0040] According to the above structure, the second passage portion facing the second side of the control device and the third passage portion passing through the interior of the electric motor are positioned close to each other. This shortens the cooling air passage, thus reducing the pressure loss generated when the cooling air flows through it. As a result, it is possible to suppress the reduction in cooling airflow due to pressure loss.

[0041] In one or more embodiments, the control device may also have fins protruding from one of the first and second surfaces.

[0042] Based on the above structure, the fins increase the contact area between the control device and the cooling air. This allows for efficient cooling of the control device.

[0043] In one or more embodiments, one of the first and second surfaces may have a first region where the fins are configured and a second region where the fins are not configured. The housing may also have a partition wall separating the first region and the second region.

[0044] The first region equipped with fins has higher heat dissipation efficiency compared to the second region without fins. Based on the above structure, the partition wall can suppress the flow of cooling air towards the second region (i.e., the region with lower heat dissipation efficiency) and promote the flow of cooling air towards the first region (i.e., the region with higher heat dissipation efficiency). This increases the flow rate of cooling air flowing in the first region (i.e., the region with higher heat dissipation efficiency), thus enabling more efficient cooling of the control device.

[0045] In one or more embodiments, the control device may also include a capacitor protruding from another of the first and second surfaces.

[0046] According to the above structure, the cooling air flows in contact with the outer surface of the capacitor. This allows for direct cooling of the capacitor.

[0047] In one or more embodiments, the capacitor may include a first capacitor and a second capacitor. The first capacitor and the second capacitor are offset from each other in a direction orthogonal to the direction of the cooling airflow, along the other of the first and second surfaces.

[0048] If the first and second capacitors are arranged along the direction of the cooling airflow, the capacitor located upstream of the first and second capacitors becomes an obstacle, and the cooling air may not reach the capacitor located downstream of the first and second capacitors. As a result, it is possible that only one of the first and second capacitors is cooled, while the other is not. In contrast, according to the structure described above, the first and second capacitors are arranged in a direction orthogonal to the direction of the cooling airflow, so the cooling air reaches both the first and second capacitors. Thus, both the first and second capacitors can be cooled.

[0049] In one or more embodiments, the cooling air passage may include a relay passage portion facing the end face of the control device that connects the first surface and the second surface. Alternatively, the cooling air may flow in the first passage portion and then, after passing through the relay passage portion, flow in the second passage portion.

[0050] According to the above structure, cooling air flows along the three sides of the control device (i.e., the first side, the second side, and the end face connecting the first side and the second side). This allows for efficient cooling of the control device.

[0051] In one or more embodiments, the housing may have a flat wall disposed at the connection between the downstream end of the relay path portion and the upstream end of the second path portion, extending along the second surface.

[0052] According to the above structure, the cooling air flowing from the relay passage section to the second passage section can be guided by the flat wall to flow along the second surface of the control device. This allows for efficient cooling of the control device.

[0053] In one or more embodiments, the first passage portion may extend from one end of the first surface along the first surface to the other end of the first surface. Alternatively, the second passage portion may extend from one end of the second surface along the second surface to the other end of the second surface.

[0054] According to the above structure, the cooling air flows from one end of the first surface to the other end, and then from one end of the second surface to the other end. This increases the contact area between the control device and the cooling air, thus enabling efficient cooling of the control device.

[0055] In one or more embodiments, the first passage portion may be opposite to the air intake.

[0056] The cooling air that has just entered the intake port has not yet absorbed heat from the components inside the casing and is at a relatively low temperature. According to the above structure, the cooling air that has just entered the intake port, i.e., the relatively low-temperature cooling air, flows in the first passage section. Therefore, the cooling air absorbs a large amount of heat from the first surface of the control device. This allows for efficient cooling of the control device.

[0057] In one or more embodiments, the first passage portion may extend along the short side of the first surface of the control device. Alternatively, the second passage portion may extend along the short side of the second surface of the control device.

[0058] According to the above structure, the first passage portion is shorter than when the first passage portion extends along the long side of the first surface of the control device. Furthermore, according to the above structure, the second passage portion is shorter than when the second passage portion extends along the long side of the second surface of the control device. As a result, the cooling air passage is shortened, thus reducing the pressure loss generated when the cooling air flows through it. Consequently, it is possible to suppress the reduction in cooling airflow due to pressure loss.

[0059] In one or more embodiments, the machine may also include a filter that is detachably mounted on the housing such that it covers the air intake from the outside of the housing.

[0060] According to the above structure, foreign objects (such as chips) can be prevented from entering the interior from the outside of the housing through the air intake. Furthermore, according to the above structure, the user can remove the filter from the housing for cleaning.

[0061] (Example)

[0062] like Figure 1 As shown, the chainsaw 2 includes a housing 4, a guide bar 6, a saw chain 8, and a sprocket cover 10. The guide bar 6 is an elongated, plate-shaped component mounted to the housing 4, protruding forward from the housing 4. The guide bar 6 includes a bar body 12 and a front sprocket 14 disposed at the front end of the bar body 12. The bar body 12 is made of a relatively lightweight metal (e.g., aluminum alloy). The front sprocket 14 is made of a relatively strong metal (e.g., iron alloy). The saw chain 8 has multiple blades (not shown) interconnected. The saw chain 8 is connected to the sprocket 16 (see reference 10) supported on the housing 4. Figure 5 The chain saw 2 is mounted along the periphery of the guide rod 6, with the front sprocket 14 engaged with it. Battery pack B is detachably mounted on the chainsaw 2. Battery pack B contains multiple rechargeable secondary battery cells (not shown). The chainsaw 2 uses power supplied from battery pack B to power electric motor 116 (see reference). Figure 3 The action of the chain saw 16 causes the sprocket 16 to rotate, moving the saw chain 8 along the periphery of the guide bar 6. The user can cut the object (e.g., window glass, sheet metal, roof, door) by pressing the saw chain 8, which moves along the periphery of the guide bar 6. The chainsaw 2 is used, for example, in rescue operations. Furthermore, in... Figure 2 For the sake of simplicity, the illustration of saw chain 8 has been omitted.

[0063] In this embodiment, as Figure 2As shown, with the chainsaw 2 placed on a horizontal surface S (like the ground) as a reference, the front-back, up-down, left-right directions are determined. Specifically, the direction orthogonal to the surface S and moving from the surface S towards the chainsaw 2 is defined as upward, and its opposite direction is defined as downward. Furthermore, the direction in which the front end of the guide rod 6, projected onto the long side of the guide rod 6 onto the surface S, faces is defined as forward, and its opposite direction is defined as backward. Additionally, the direction orthogonal to both the front-back and up-down directions and facing the outer surface of the sprocket cover 10 is defined as right, and its opposite direction is defined as left.

[0064] like Figure 1 As shown, the outer casing 4 includes a main body 18, a battery storage section 20, a rear handle 22, and a rear handguard 24. The main body 18 has a generally cuboid shape with its long side extending in the front-to-back direction.

[0065] The rear handle 22 extends downward and backward from the upper part of the rear surface of the main body 18. The rear handguard 24 extends downward from the rear end of the rear handle 22, bends and extends forward, and connects to the lower part of the rear surface of the main body 18. The rear handguard 24 protects the user's hand holding the rear handle 22.

[0066] A power button 26 for switching the power of the chainsaw 2 on / off and a speed switch button 28 for switching the movement speed of the saw chain 8 when it is driven are arranged on the upper surface near the front end of the rear handle 22. A trigger lever 30 for driving the chainsaw 2 to drive the saw chain 8 is arranged on the lower surface near the front end of the rear handle 22. A main locking lever 32 for locking or unlocking the trigger lever 30 and a secondary locking lever 34 for locking or unlocking the main locking lever 32 are arranged on the upper surface of the rear handle 22. Normally, the main locking lever 32 locks the trigger lever 30, and the secondary locking lever 34 locks the main locking lever 32. That is, the main locking lever 32 and the secondary locking lever 34 prevent the user from operating the trigger lever 30. When the user tilts the secondary locking lever 34 forward with the palm of the hand holding the rear handle 22 from this state, the secondary locking lever 34 unlocks the main locking lever 32. Next, when the user presses the palm of their hand holding the rear handle 22 into the main locking lever 32, the main locking lever 32 unlocks the trigger lever 30. This allows the user to operate the trigger lever 30. From this state, when the user presses the trigger lever 30 with the index finger of their hand holding the rear handle 22, the saw chain 8 is activated.

[0067] The chainsaw 2 also features a front handle 36 and a front handguard 38. The front handle 36 includes: a lower fixing part 40 (see reference). Figure 11The lower surface of the housing 4 extends horizontally along the lower surface of the housing 4; the left side grip 42 extends upward from the left end of the lower fixing part 40; the upper side grip 44 extends to the right from the upper end of the left side grip 42; and the right side fixing part 46 extends downward and rearward from the right end of the upper grip 44. The lower fixing part 40 is secured by screws 48 (see reference). Figure 11 It is fixed to the lower surface of the outer casing 4. The right-side fixing part 46 is secured by screws 50 (see reference). Figure 2 The chainsaw 2 is fixed to the rear right surface of the outer casing 4. The user can move the chainsaw 2 by holding the left side grip 42 or the upper grip 44 of the front handle 36 with one hand and the rear handle 22 with the other. Additionally, the front handguard 38 is rotatably mounted on the upper front of the main body 18. The front handguard 38 can rotate relative to the main body 18 about a rotation axis extending in the left-right direction. The front handguard 38 is positioned further forward than the front handle 36. The front handguard 38 protects the user's hand holding the upper grip 44 of the front handle 36.

[0068] The battery storage section 20 is disposed between the front handle 36 and the rear handle 22. The battery storage section 20 includes a storage recess 52 formed by recessing the rear portion of the upper surface of the main body 18 downwards, and a battery mounting section 54 formed on the right wall of the storage recess 52 (see reference). Figure 3 The user can install battery pack B into battery mounting portion 54 by sliding it from top to bottom relative to battery mounting portion 54. Conversely, the user can remove battery pack B from battery mounting portion 54 by sliding it from bottom to top relative to battery mounting portion 54. In the state where battery pack B is installed in battery mounting portion 54 (i.e., Figure 1 In the state shown, battery pack B is housed in the storage recess 52.

[0069] like Figure 3 As shown, the battery mounting section 54 includes a device-side terminal 56 protruding from the right wall of the receiving recess 52. When the battery pack B is mounted in the battery mounting section 54, the device-side terminal 56 is electrically connected to the battery terminals (not shown) provided in the battery pack B. The battery terminals are used for charging the battery pack B, discharging from the battery pack B, receiving signals to the battery pack B, and transmitting signals from the battery pack B. When the battery pack B is removed from the battery mounting section 54, the connection between the device-side terminal 56 and the battery terminals is released.

[0070] like Figure 4As shown, the sprocket cover 10 and guide rod 6 are fastened together to the right surface of the main body 18 by bolts 58a and 58b and nuts 60a and 60b. Bolts 58a and 58b are fixed to the main body 18 and protrude to the right from the right surface of the main body 18. Nuts 60a and 60b are threaded into bolts 58a and 58b. The sprocket cover 10 and guide rod 6 are clamped between the seat surfaces of nuts 60a and 60b and the right surface of the main body 18. The user can release the sprocket cover 10 and guide rod 6 from the main body 18 by removing nuts 60a and 60b from bolts 58a and 58b.

[0071] like Figure 5 As shown, sprocket 16 is in sprocket cover 10 (refer to...) Figure 4 The space inside the main body 18 and outside the main body 18 is exposed. Additionally, the guide rod 6 has an elongated hole 64 extending in the front-rear direction. Support pins 62a and 62b, formed near the base ends of bolts 58a and 58b, are embedded in the elongated hole 64. The guide rod 6 is supported on the main body 18 by the support pins 62a and 62b. With the nuts 60a and 60b loosened relative to bolts 58a and 58b, the user slides the guide rod 6 relative to the main body 18 in the front-rear direction, thereby changing the distance in the front-rear direction between the guide rod 6 and the sprocket 16 to adjust the saw chain 8 (see reference). Figure 1 The tension of the saw chain 8 is adjusted by tightening or loosening the position adjusting screw 6. Additionally, a position adjusting screw 66 is positioned between the support pins 62a and 62b. The position adjusting screw 66 has a flathead hole 68 that engages with a flathead screwdriver. By tightening or loosening the position adjusting screw 66, the user can move the guide rod 6 in the back-and-forth direction to adjust the tension of the saw chain 8. Figure 4 As shown, the sprocket cover 10 has an exposure hole 70 that exposes the position adjustment screw 66 to the outside. Therefore, the user can tighten or loosen the position adjustment screw 66 while the sprocket cover 10 is installed on the main body 18.

[0072] like Figure 6 As shown, a retainer 80 for holding the tool 72 is mounted on the front handle 36 (specifically, the upper part of the right-side fixing portion 46). In this embodiment, the tool 72 can be held relative to bolts 58a, 58b (see...). Figure 5 Tighten or loosen nuts 60a and 60b (refer to...) Figure 4 In the case of ), adjust the position via screw 66 (refer to) Figure 5This tool is used for adjustments. Specifically, the tool 72 includes a wrench portion 74 that engages with the outer surfaces of nuts 60a and 60b, a rod-shaped portion 76 extending from the outer peripheral surface of the wrench portion 74, and a flathead screwdriver portion 78 formed at the front end of the rod-shaped portion 76. The user can use the wrench portion 74 of the tool 72 to tighten or loosen nuts 60a and 60b relative to bolts 58a and 58b. The user can use the flathead screwdriver portion 78 of the tool 72 to tighten or loosen the position adjustment screw 66. In addition, the user can also use the flathead screwdriver portion 78 of the tool 72 to tighten or loosen the oil level adjustment screw 302 (see reference) provided on the oil pump 124. Figure 3 Tighten or loosen. By tightening or loosening the oil level adjusting screw 302, the amount of lubricating oil supplied by the oil pump 124 from the oil tank 122 to the guide rod 6 and the saw chain 8 when driving the saw chain 8 can be adjusted. Figure 11 As shown, the oil level adjusting screw 302 is exposed to the outside of the housing 4 through an exposure hole 304 provided on the lower surface of the housing 4.

[0073] Figure 6 The retainer 80 shown is made of a flexible material (e.g., rubber). The retainer 80 includes a strap 82 wrapped around the right-side fixing portion 46, a first retaining portion 84 connected to one end of the strap 82, and a second retaining portion 86 connected to the other end of the strap 82.

[0074] like Figure 7 As shown, the first retaining part 84 includes: a first retaining hole 88 through which the rod-shaped part 76 of the tool 72 is inserted; a first retaining part body 90 defining the first retaining hole 88; and two snap-fit ​​protrusions 92 protruding from the rear surface of the first retaining part body 90. The second retaining part 86 includes a second retaining hole 94 through which the rod-shaped part 76 of the tool 72 is inserted, two snap-fit ​​holes 96 for the two snap-fit ​​protrusions 92 to snap together, and a second retaining part body 98 defining the second retaining hole 94 and the two snap-fit ​​holes 96. The retainer 80 passes through the belt part 82 (see reference). Figure 6 )wound around the right-side fixing part 46 (refer to) Figure 6In the surrounding state, the two snap-fit ​​protrusions 92 are engaged with the two snap-fit ​​holes 96 and installed on the right-side fixing part 46. In this state, the retainer 80 can hold the tool 72 by receiving the rod-shaped portion 76 of the tool 72 into the first retaining hole 88 and the second retaining hole 94 respectively. In addition, the retainer 80 can be removed from the right-side fixing part 46 by disengaging the two snap-fit ​​protrusions 92 from the two snap-fit ​​holes 96. However, when the rod-shaped portion 76 of the tool 72 is inserted through the first retaining hole 88 and the second retaining hole 94 respectively, the first retaining part 84 and the second retaining part 86 are fixed to each other via the rod-shaped portion 76, thus preventing the two snap-fit ​​protrusions 92 from being disengaged from the two snap-fit ​​holes 96 (i.e., removing the retainer 80 from the right-side fixing part 46). When the rod-shaped portion 76 is disengaged from the first retaining hole 88 and the second retaining hole 94 respectively, it is permissible to disengage the two snap-fit ​​protrusions 92 from the two snap-fit ​​holes 96 (i.e., remove the retainer 80 from the right-side fixing part 46).

[0075] like Figure 8 As shown, a plurality of air intakes 100 are formed on the upper left surface of the outer casing 4, communicating between the interior and exterior of the outer casing 4. The plurality of air intakes 100 are disposed in front of the battery storage section 20. The plurality of air intakes 100 are elongated holes extending in the front-rear direction.

[0076] like Figure 9 As shown, the chainsaw 2 also includes a filter 102 that covers a plurality of air intakes 100 from the outside of the housing 4 (see reference). Figure 8 It can be detachably installed on the housing 4 using a method that allows for mounting. For example... Figure 10 As shown, the filter 102 includes: a filter plate 106 having a plurality of filter holes 104; a filter screen 108 stretched over the plurality of filter holes 104; and a plurality of snap-fit ​​claws 110 protruding from the right surface of the filter plate 106. The filter 102 is fitted into a plurality of air intake ports 100 by snapping the plurality of snap-fit ​​claws 110 together (see reference). Figure 8 The filter 102 is mounted on the periphery of the housing 4. The plurality of filter holes 104 are respectively arranged opposite to the plurality of air intakes 100. The filter 102 allows air to enter the interior from the outside of the housing 4 through the plurality of air intakes 100 and prevents foreign objects (such as chips, dust) from entering the interior from the outside of the housing 4 through the plurality of air intakes 100.

[0077] like Figure 9 As shown, the housing 4 has a finger insertion recess 112 on the rear side of the plurality of air intakes 100. The finger insertion recess 112 opens to the rear. The user inserts a finger into the finger insertion recess 112 and pulls the filter 102 mounted on the housing 4 to the left near the rear end, thereby releasing the plurality of locking claws 110 (see reference). Figure 10 ) and multiple air inlets 100 (refer to) Figure 8The filter 102 can be removed from the housing 4 by engaging the battery pack B. Furthermore, when the battery pack B is installed in the battery mounting section 54, the finger insertion recess 112 is covered by the battery pack B. Therefore, when the battery pack B is installed in the battery mounting section 54 (i.e., when the user uses the chainsaw 2), it is possible to prevent the user's finger from entering the finger insertion recess 112, thereby preventing the filter 102 from being removed from the housing 4.

[0078] like Figure 11 As shown, a plurality of vents 114 are formed on the front part of the lower surface of the housing 4, which communicates the interior and exterior of the housing 4. The plurality of vents 114 are elongated holes extending in the front-rear direction. The plurality of vents 114 are positioned to the right of the right end of the lower fixing part 40 of the front handle 36.

[0079] like Figure 3 As shown, the chainsaw 2 also includes an electric motor 116, a motor housing 118, a control device 120, an oil tank 122, and an oil pump 124. The electric motor 116 is disposed inside the housing 4 in front of the battery mounting section 54. The motor housing 118 is fixed to the housing 4 by screws 126, supporting the electric motor 116 by surrounding its outer peripheral surface. The control device 120 is disposed inside the housing 4 above the motor housing 118 (i.e., the electric motor 116). The oil tank 122 is disposed inside the housing 4 in front of the motor housing 118 (i.e., the electric motor 116). The oil pump 124 is fixed to the left wall of the motor housing 118 by screws 128.

[0080] like Figure 12 As shown, the electric motor 116 in this embodiment is an inner rotor type DC brushless motor having a stator 130, a rotor 132 disposed inside the stator 130, and an output shaft 134 fixed to the rotor 132. The output shaft 134 is rotatably supported on the housing 4 via bearings 136 and 138. A centrifugal fan 140, a brake drum 146, and a sprocket 16 are fixed to the right side of the output shaft 134. The centrifugal fan 140 is disposed to the right of the stator 130 and the rotor 132. The brake drum 146 is disposed to the right of the centrifugal fan 140. The sprocket 16 is disposed to the right of the brake drum 146. As described above, the saw chain 8 (refer to...) Figure 1 From guide rod 6 (reference) Figure 1The output shaft 134 is mounted on the sprocket 16. When the electric motor 116 is activated, the sprocket 16 rotates together with the output shaft 134, thereby driving the saw chain 8 along the periphery of the guide rod 6. When the output shaft 134 rotates, if the user pushes the front handguard 38 forward, the rotation of the output shaft 134 is braked by the brake drum 146. In addition, the centrifugal fan 140 generates cooling air inside the housing 4 by rotating together with the output shaft 134. The centrifugal fan 140 has a circular plate portion 142 that extends radially in the output shaft 134 and a plurality of blade portions 144 that protrude to the left from the left surface of the circular plate portion 142.

[0081] A worm gear 148 is fixed to the left side of the output shaft 134. The worm gear 148 is connected to the oil pump 124 (see reference). Figure 3 The worm gear 150 engages with the output shaft 134. Therefore, when the electric motor 116 actuates and the output shaft 134 rotates, the oil pump 124 is driven. When driven... Figure 3 When the oil pump 124 is shown, the lubricating oil stored in the oil tank 122 is drawn into the oil pump 124 through the suction pipe 152 and discharged through the discharge pipe 154, guide rod 6 and saw chain 8.

[0082] like Figure 12 As shown, the control device 120 includes a control board 156 and a controller housing 158 that houses the control board 156. The control board 156 is equipped with an inverter circuit (not shown) having multiple switching elements and a control circuit (not shown) that controls the operation of each switching element. The controller housing 158 is made of, for example, aluminum alloy. The controller housing 158 has a housing body 160 that opens downwards and multiple fins 162 that protrude upwards from the upper surface 174 of the housing body 160. The control board 156 is fixed to the housing body 160 by screws (not shown). Furthermore, the control board 156 is sealed with potting resin 164 filling the interior of the housing body 160. Multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f (see reference) are arranged on the lower surface of the control board 156. Figure 15 Multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f protrude downwards from the lower surface 180 of the potting resin 164. The control device 120 has a front surface 170 of the housing body 160 (see reference). Figure 13 ), the rear surface 172 of the housing body 160 (refer to Figure 13 The upper surface 174, left surface 176, right surface 178, and lower surface 180 of the potting resin 164 of the housing body 160 are defined as approximately cuboid shapes. The control device 120 is configured such that the lower surface 180 of the potting resin 164 is opposite to the upper surface of the motor housing 118.

[0083] like Figure 13As shown, the upper surface 174 of the housing body 160 is arranged with its long side along the front-back direction and its short side along the left-right direction. The upper surface 174 of the housing body 160 has a first region 182 with a plurality of fins 162 and a second region 184 without the plurality of fins 162. The first region 182 is located behind the second region 184. Figure 13 In the diagram, the boundary between the first region 182 and the second region 184 is shown using a dashed line.

[0084] like Figure 14 As shown, the space facing the first region 182 (i.e., the space where multiple fins 162 are configured) is arranged opposite to the multiple air intakes 100. Additionally, the housing 4 includes a partition wall 186 that separates the space facing the first region 182 (i.e., the space where multiple fins 162 are configured) from the space facing the second region 184 (i.e., the space where multiple fins 162 are not configured). Cooling air flowing into the multiple air intakes 100 is directed through the partition wall 186 to flow towards the space facing the first region 182 (i.e., the space where multiple fins 162 are configured).

[0085] like Figure 15 As shown, the lower surface 180 of the potting resin 164 is arranged with its long side along the front-to-back direction and its short side along the left-to-right direction. Furthermore, a plurality of capacitors 166a, 166b, 166c, 166d, 166e, and 166f include: a first capacitor 166a disposed at the rearmost position; a second capacitor 166b offset forward from the first capacitor 166a; a third capacitor 166c offset to the left and forward from the second capacitor 166b; a fourth capacitor 166d offset forward from the third capacitor 166c; a fifth capacitor 166e offset forward from the fourth capacitor 166d; and a sixth capacitor 166f offset to the right from the fifth capacitor 166e. Details will be described later. Near the lower surface 180 of the potting resin 164, cooling air flows from right to left (see reference). Figure 12 Multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f are distributed in a front-to-back direction (i.e., a direction orthogonal to the direction of cooling airflow), so that the cooling airflow is evenly blown onto the outer surfaces of the multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f.

[0086] (Regarding cooling air passage 190)

[0087] like Figure 12As shown, a cooling air passage 190 is formed inside the housing 4 to deliver air flowing into multiple intake ports 100 to multiple exhaust ports 114. The cooling air passage 190 includes: an upper passage portion 190a, which faces a first region 182 of the upper surface 174 of the housing body 160; a right passage portion 190b, which faces the right surface 178 of the housing body 160; a central passage portion 190c, which faces the lower surface 180 of the potting resin 164 and the upper surface of the motor housing 118; a left passage portion 190d, which passes through the space between the left wall of the motor housing 118 and the left wall of the housing 4; a lower passage portion 190e, which passes through the internal space of the motor housing 118 (specifically, the space between the stator 130 and the rotor 132); and a vortex passage portion 190f, which houses the centrifugal fan 140. The upper passage portion 190a extends to the right from the intake port 100. The right-side passage portion 190b extends downward from the right end of the upper passage portion 190a. The central passage portion 190c extends to the left from the lower end of the right-side passage portion 190b. The left-side passage portion 190d extends downward from the left end of the central passage portion 190c. The lower passage portion 190e extends to the right from the lower end of the left-side passage portion 190d. The vortex passage portion 190f connects to the right end of the lower passage portion 190e, and its outlet becomes the exhaust port 114. Therefore, the cooling air passage 190 is a passage formed by connecting the upper passage portion 190a, the right-side passage portion 190b, the central passage portion 190c, the left-side passage portion 190d, the lower passage portion 190e, and the vortex passage portion 190f in series. Therefore, when the cooling air flows in the cooling air passage 190, the flow rates of the cooling air in the upper passage portion 190a, the right passage portion 190b, the central passage portion 190c, the left passage portion 190d, the lower passage portion 190e, and the vortex passage portion 190f are approximately equal.

[0088] When the electric motor 116 is activated and the centrifugal fan 140 rotates together with the output shaft 134, air (i.e., cooling air) flows from the outside of the housing 4 into the intake port 100. The cooling air flowing into the intake port 100 flows sequentially through the upper passage portion 190a, the right passage portion 190b, the central passage portion 190c, the left passage portion 190d, the lower passage portion 190e, and the vortex passage portion 190f, and is discharged from the exhaust port 114 to the outside of the housing 4. Cooling air, flowing in the upper passage 190a, draws heat from the upper surface 174 and multiple fins 162 of the housing body 160; flowing in the right passage 190b, it draws heat from the right surface 178 of the housing body 160; flowing in the central passage 190c, it draws heat from the lower surface 180 of the potting resin 164 and multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f; and flowing in the lower passage 190e, it draws heat from the electric motor 116, ultimately dissipating to the outside of the outer casing 4. Thus, the control device 120 and the electric motor 116 are cooled. Figure 12 In the diagram, arrows are used to illustrate the flow of cooling air.

[0089] The upper passage portion 190a extends from the left end of the upper surface 174 of the housing body 160 along the upper surface 174 to the right end of the upper surface 174 of the housing body 160. The central passage portion 190c extends from the right end of the lower surface 180 of the potting resin 164 along the lower surface 180 to the left end of the lower surface 180 of the potting resin 164. This increases the contact area between the control device 120 and the cooling air, allowing the cooling air to draw more heat from the control device 120.

[0090] The outer casing 4 has a guide wall 192 for guiding cooling air at the connection between the lower end of the right passage portion 190b (i.e., the downstream end of the right passage portion 190b) and the right end of the central passage portion 190c (i.e., the upstream end of the central passage portion 190c). The guide wall 192 has a first flat wall 194 opposite to the lower part of the right surface 178 of the casing body 160, a curved wall 196 extending to the left from the lower end of the first flat wall 194, and a second flat wall 198 extending to the left from the left end of the curved wall 196. The second flat wall 198 extends along the lower surface 180 of the potting resin 164. The guide wall 192 guides the cooling air flowing from the right passage portion 190b into the central passage portion 190c to flow along the lower surface 180 of the potting resin 164.

[0091] (Regarding Depth Limiter 200)

[0092] like Figure 1As shown, the chainsaw 2 also includes a depth limiter 200. The depth limiter 200, installed on the guide rod 6, limits the insertion depth of the guide rod 6 relative to the object being cut (e.g., window glass, sheet metal, roof, door, etc.). With the depth limiter 200 installed on the guide rod 6, when the front end of the guide rod 6 is inserted into the object being cut, the front end of the depth limiter 200 abuts against the object, thereby preventing the guide rod 6 from further inserting into the object. The depth limiter 200 is installed on the guide rod 6 by engaging with any one of a plurality of rod through holes 202 formed in the guide rod 6. The plurality of rod through holes 202 are arranged along the long side of the guide rod 6. By changing the rod through hole 202 on which the depth limiter 200 is installed, the user can change the position of the depth limiter 200 relative to the guide rod 6, thereby adjusting the allowable insertion depth.

[0093] The depth limiter 200 includes a first component 204 disposed to the left of the guide rod 6 and a second component 250 disposed to the right of the guide rod 6.

[0094] like Figure 16As shown, the first component 204 includes a first plate member 206, a shaft member 208, a retaining ring 210, a ball bearing 212, a spring 214, and a spring receiving member 216. The first plate member 206 includes: a first plate body 218 having a circular plate shape; a recess 220 formed by recessing the central portion of the first plate body 218 to the right; a shaft hole 222 penetrating the bottom wall of the recess 220; and a first peripheral groove 224 formed in the side wall of the recess 220. The first plate body 218 is disposed along the left surface of the guide rod 6. Furthermore, the shaft member 208 includes a shaft body 226 extending in a left-right direction and a head 228 extending radially outward from the left end of the shaft body 226. The shaft body 226 is inserted through the shaft hole 222 of the first plate member 206 and protrudes to the right from the first plate member 206. Additionally, a retaining ring 210 is embedded in the first peripheral groove 224 of the first plate member 206. The head 228 of the shaft member 208 is clamped between the bottom surface of the recess 220 and the right surface of the retaining ring 210. Thus, the shaft member 208 is fixed to the first plate body 218. Furthermore, a ball bearing receiving hole 230 is formed in the shaft member 208, extending through the shaft body 226 in the front-rear direction. The ball bearing receiving hole 230 includes a guide portion 232 having an inner diameter slightly larger than the outer diameter of the ball 212, and a stop portion 234 having an inner diameter slightly smaller than the outer diameter of the ball 212. The guide portion 232 is disposed at the front of the ball bearing receiving hole 230. The stop portion 234 is disposed at the rear of the ball bearing receiving hole 230. The spring receiving member 216 is pressed into the opening at the front side of the ball bearing receiving hole 230. The ball 212 is disposed between the spring receiving member 216 and the stop portion 234. The spring 214 applies a rearward force to the ball 212 relative to the spring receiving member 216. Normally, the ball 212 is held in a position protruding outward from the opening on the rear side of the ball receiving hole 230 into the external space of the shaft body 226 by the force of the spring 214 (that is, a protruding position that protrudes outward from the outer peripheral surface of the shaft body 226). Hereinafter, the constituent elements including the shaft body 226, the ball receiving hole 230, the ball 212, the spring 214, and the spring receiving member 216 will also be referred to as the "engulfing part 236".

[0095] The second component 250 includes a second plate member 252. The second plate member 252 includes: a cylindrical portion 254 through which the shaft member 208 of the first component 204 can be inserted; a second plate body 256 having a circular plate shape extending radially outward from the right end of the cylindrical portion 254; a second circumferential groove 258 formed on the inner circumferential surface of the cylindrical portion 254; a left-side through hole 260 defined by the inner circumferential surface of the cylindrical portion 254 to the left of the second circumferential groove 258; and a right-side through hole 262 defined by the inner circumferential surface of the cylindrical portion 254 to the right of the second circumferential groove 258. The second circumferential groove 258 is recessed radially outward from the inner circumferential surface of the cylindrical portion 254. Therefore, the inner diameter of the second circumferential groove 258 is larger than the inner diameter of the cylindrical portion 254 (i.e., the inner diameters of the left-side through hole 260 and the right-side through hole 262). Hereinafter, the constituent element including the cylindrical portion 254, the second circumferential groove 258, the left through hole 260, and the right through hole 262 will also be referred to as the "concave engagement portion 264".

[0096] First, the steps for installing the first component 204 and the second component 250 relative to the guide rod 6 will be explained.

[0097] like Figure 17 As shown, when the protruding engagement portion 236 of the first component 204 is inserted into the rod through hole 202 of the guide rod 6, the periphery of the rod through hole 202 abuts against the outer surface of the ball 212 in the protruding position. As a result, the ball 212 is pressed into a retracted position, retracting from the protruding position into the ball receiving hole 230. Then, if the protruding engagement portion 236 is further inserted relative to the rod through hole 202, the periphery of the rod through hole 202 passes over the ball 212. When the periphery of the rod through hole 202 passes over the ball 212, the ball 212 returns to the protruding position by the force of the spring 214. Thus, as... Figure 18 As shown, the convex engagement portion 236 engages with the rod through hole 202, thereby mounting the first component 204 onto the guide rod 6. In this state, when the convex engagement portion 236 is to disengage from the rod through hole 202, the periphery of the rod through hole 202 abuts against the outer surface of the protruding ball 212. In other words, the protruding ball 212 interferes with the rod through hole 202. This prevents the convex engagement portion 236 from disengaging from the rod through hole 202. Furthermore, with the first component 204 mounted on the guide rod 6, moving the second component 250 toward the guide rod 6 allows the convex engagement portion 236 of the first component 204 to be inserted into the concave engagement portion 264 of the second component 250.

[0098] like Figure 19As shown, when the protruding engagement portion 236 of the first component 204 is inserted into the concave engagement portion 264 of the second component 250, the peripheral edge of the left through hole 260 abuts against the outer surface of the ball 212 in the protruding position. As a result, the ball 212 is pressed into the retracted position. Then, if the protruding engagement portion 236 is further inserted into the left through hole 260, the peripheral edge of the left through hole 260 passes over the ball 212, and the ball 212 reaches the second circumferential groove 258. The bottom surface of the second circumferential groove 258 does not interfere with the ball 212 in the protruding position. Therefore, when the ball 212 reaches the second circumferential groove 258, the ball 212 returns to the protruding position by the force of the spring 214. Thus, as... Figure 20 As shown, the convex engaging portion 236 engages with the left through hole 260, the first component 204 and the second component 250 are mounted to each other, and the second component 250 is mounted on the guide rod 6. In this state, when the convex engaging portion 236 is to disengage from the left through hole 260, the periphery of the left through hole 260 abuts against the outer surface of the protruding ball 212. In other words, the protruding ball 212 interferes with the left through hole 260. This prevents the convex engaging portion 236 from disengaging from the left through hole 260. In addition, when the convex engaging portion 236 is engaged with the left through hole 260, the shaft body 226 of the convex engaging portion 236 engages with the left through hole 260 and the right through hole 262 of the concave engaging portion 264, respectively. This prevents the first component 204 and the second component 250 from wobbling relative to each other.

[0099] Next, the sequence of disassembling the first component 204 and the second component 250 from the self-guide rod 6 will be explained.

[0100] from Figure 20 From the indicated state, by moving the second component 250 away from the guide rod 6, the convex engaging portion 236 moves in such a way that it disengages from the left through hole 260 and the right through hole 262 respectively. At this time, as Figure 19 As shown, the periphery of the left through hole 260 abuts against the outer surface of the ball 212 in the protruding position. This presses the ball 212 into the retracted position, releasing the engagement between the convex engagement portion 236 and the left through hole 260. Subsequently, if the convex engagement portion 236 further disengages relative to the left through hole 260, the periphery of the left through hole 260 passes over the ball 212. As the periphery of the left through hole 260 passes over the ball 212, the ball 212 returns to the protruding position under the force of the spring 214. Thus, as... Figure 18 As shown, the second component 250 is detached from the first component 204 and from the guide rod 6.

[0101] By causing the first component 204 to... Figure 18 The state shown indicates that the rod moves away from the guide rod 6, and the convex engaging portion 236 moves in a manner that disengages from the rod through hole 202. At this time, as... Figure 17 As shown, the periphery of the rod through hole 202 abuts against the outer surface of the ball 212, which is in a protruding position. This presses the ball 212 into a retracted position, releasing the engagement between the convex engagement portion 236 and the rod through hole 202. Then, as the convex engagement portion 236 further disengages from the rod through hole 202, the periphery of the rod through hole 202 passes over the ball 212. As the periphery of the rod through hole 202 passes over the ball 212, the ball 212 returns to its protruding position under the force of the spring 214. Thus, as... Figure 16 As shown, the first component 204 is detached from the guide rod 6.

[0102] Although not shown, the surface of the first plate member 206 of the first component 204 serves as the substrate. Therefore, the surface of the first plate member 206 is silver-white. On the other hand, the surface of the second plate member 252 of the second component 250 is treated with an aluminum oxide film. Through this aluminum oxide film treatment, the surface of the second plate member 252 is colored red. Thus, the user can identify the differences between the first component 204 and the second component 250 (e.g., differences in shape) by color.

[0103] like Figure 21 As shown, the chainsaw 2 also includes a cover 270 that can be detachably mounted on the guide rod 6. Figure 22 As shown, the cover 270 includes a cover body 272 that opens rearward, a notch 274 formed on the rear side of the cover body 272, and a hook-and-loop portion 276 formed on the upper rear part of the cover body 272. Figure 21 As shown, the cover body 272 houses the guide rod 6. A notch 274 extends forward from the rear end of the cover body 272. The notch 274 allows multiple rods to pass through the holes 202 (see reference). Figure 1 The rearmost rod through-hole 202 in the guide rod 6 is exposed to the outside. The notch 274 prevents interference between the depth limiter 200 installed in the rearmost rod through-hole 202 and the cover 270 that is attached and detached from the guide rod 6. Therefore, the user can attach and detach the cover 270 from the guide rod 6 while the depth limiter 200 is installed. Furthermore, even with the cover 270 installed on the guide rod 6, the user can visually identify the depth limiter 200. This prevents the user from forgetting to bring the depth limiter 200 to the work site. Additionally, by passing a rope through the hook 276 and securing the rope, for example, to the front handle 36, the user can prevent the cover 270 from accidentally detaching from the guide rod 6.

[0104] (Modified example)

[0105] (Refer to Figure 12The shape and configuration of the cooling air passage 190, control device 120 and electric motor 116 can also be applied to work machines other than chainsaw 2 (such as hedge trimmers, electric circular saws, lawn mowers).

[0106] (Refer to Figure 12 The centrifugal fan 140 can also be replaced with other types of fans (e.g., axial fans). Furthermore, the centrifugal fan 140 is not limited to rotating integrally with the output shaft 134; it can also rotate independently of the output shaft 134. In this case, the chainsaw 2 can also have an electric motor for rotating the centrifugal fan 140, separate from the electric motor 116.

[0107] (Refer to Figure 12 The cooling air passage 190 can also face either the front or back of the control device 120. For example, the cooling air passage 190 can also face the front surface 170 and the rear surface 172 of the housing body 160. Alternatively, the cooling air passage 190 can also face the left surface 176 and the right surface 178 of the housing body 160.

[0108] (Refer to Figure 12 The cooling air passage 190 may also not have a portion passing through the electric motor 116 (i.e., the lower passage portion 190e). In this case, the cooling air flowing into the intake port 100 may also reach the exhaust port 114 without passing through the electric motor 116 after passing through the front and back of the control device 120.

[0109] (Refer to Figure 12 The chainsaw 2 may also be without a motor housing 118. As a result, the outer surface of the stator 130 may be exposed in the central passage portion 190c of the cooling air passage 190.

[0110] (Refer to Figure 3 , Figure 12 The control device 120 can also be offset from the position shown in the embodiment in the forward / backward or left / right direction. As a result, the lower surface 180 of the potting resin 164 may not be opposite to the upper surface of the motor housing 118.

[0111] (Refer to Figure 12 The cooling air passage 190 may also lack a portion facing the right surface 178 of the housing body 160 (i.e., the right-side passage portion 190b). In this case, the cooling air flowing into the intake port 100 may flow along the upper surface 174 of the housing body 160, but instead of along the right surface 178 of the housing body 160, it may flow along the lower surface 180 of the potting resin 164.

[0112] (Refer to Figure 12The control device 120 can also be configured in an upside-down orientation from the orientation shown in the embodiment. Thus, it is also possible that multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f are configured in the upper passage portion 190a, and multiple fins 162 are configured in the central passage portion 190c.

[0113] (Refer to Figure 12 The control device 120 may also not have multiple fins 162.

[0114] (Refer to Figure 14 The outer casing 4 may also be without the partition wall 186. Thus, the upper passage portion 190a may face the first region 182 and the second region 184 of the upper surface 174 of the casing body 160, respectively.

[0115] (Refer to Figure 15 The control device 120 may also not include at least one of the multiple capacitors 166a, 166b, 166c, 166d, 166e, 166f.

[0116] (Refer to Figure 15 Multiple capacitors 166a, 166b, 166c, 166d, 166e, and 166f can also be arranged in the front-to-back direction (i.e., the direction orthogonal to the direction of cooling airflow).

[0117] (Refer to Figure 12 The guide wall 192 may also not have a second flat wall 198.

[0118] (Refer to Figure 12 The upper passage portion 190a may also extend along a portion of the upper surface 174 of the housing body 160 from the left end to the right end. The central passage portion 190c may also extend along a portion of the lower surface 180 of the potting resin 164 from the right end to the left end.

[0119] (Refer to Figure 12 The upper passage portion 190a may not be opposite to the inlet 100.

[0120] (Refer to Figure 12 , Figure 13 The upper passage portion 190a can also extend along the long side direction (i.e., the front-to-back direction) of the upper surface 174 of the housing body 160.

[0121] (Refer to Figure 12 , Figure 15 The central passage portion 190c can also extend along the long side direction (i.e., the front-to-back direction) of the lower surface 180 of the potting resin 164.

[0122] (Refer to Figure 10Chainsaw 2 may also be without filter 102.

[0123] (Refer to Figures 16-20 The positions of the first component 204 and the second component 250 relative to the guide rod 6 can also be interchanged. That is, the first component 204 can be disposed on the right surface of the guide rod 6, and the second component 250 can be disposed on the left surface of the guide rod 6.

[0124] (Refer to Figure 1 The first plate body 218 and / or the second plate body 256 may also have shapes other than circular plate shapes (e.g., polygonal shapes).

[0125] (Refer to Figure 3 The chainsaw 2 may also have a prime mover other than the electric motor 116 (such as an internal combustion engine), and the sprocket 16 may also be rotated by the prime mover.

[0126] (Refer to Figures 16-20 The diameter of the rod through hole 202 can also be large enough that the periphery of the rod through hole 202 does not interfere with the ball 212 when the convex engaging part 236 is inserted into the rod through hole 202. Thus, it can also be configured such that the convex engaging part 236 and the rod through hole 202 do not engage with each other.

[0127] (Refer to Figures 16-20 The engaging portion 236 may also have an O-ring mounted on the outer peripheral surface of the shaft body 226 instead of the ball receiving hole 230, ball 212, spring 214, and spring receiving member 216. In this example, when the engaging portion 236 is inserted into the rod through hole 202 (or the left through hole 260), the periphery of the rod through hole 202 (or the left through hole 260) presses and passes over the O-ring, thereby engaging the engaging portion 236 with the rod through hole 202 (or the left through hole 260). Alternatively, when the engaging portion 236 is disengaged from the rod through hole 202 (or the left through hole 260), the periphery of the rod through hole 202 (or the left through hole 260) presses and passes over the O-ring, thereby releasing the engaging portion 236 from the rod through hole 202 (or the left through hole 260).

[0128] (Refer to Figures 16-20The convex engaging portion 236 may have an external thread defined on the outer circumferential surface of the shaft body 226 instead of having a ball receiving hole 230, a ball 212, a spring 214, and a spring receiving member 216. Similarly, the concave engaging portion 264 may have an internal thread defined on the inner circumferential surface of the cylindrical portion 254 instead of having a second circumferential groove 258. In this example, the convex engaging portion 236 and the concave engaging portion 264 can be engaged by threading the external thread of the convex engaging portion 236 with the internal thread of the concave engaging portion 264. Furthermore, the position of the external thread of the convex engaging portion 236 can be fixed to the first plate member 206, or it can be rotatable relative to the first plate member 206.

[0129] (Refer to Figures 16-20 Alternatively, the surfaces of the first plate member 206 and the second plate member 252 can be treated in the same way. Therefore, the color of the surface of the first plate member 206 and the color of the surface of the second plate member 252 can be approximately the same.

[0130] (Refer to Figure 21 Chainsaw 2 may also be without cover 270.

[0131] (Refer to Figure 1 , Figure 2 The guide rod 6 may also be without the front sprocket 14 (i.e., the part made of high-strength metal).

[0132] (Refer to Figure 1 , Figure 2 The chainsaw 2 may also be without the depth limiter 200. In this case, the guide rod 6 may also be without the rod through hole 202.

[0133] (Features of the embodiment)

[0134] In one or more embodiments, the chainsaw 2 (an example of a working machine) includes: a saw chain 8 (an example of a working part); an electric motor 116 that drives the saw chain 8; a control device 120 that controls the electric motor 116; a housing 4 that houses the electric motor 116 and the control device 120; an air intake 100 and an exhaust 114 that connect the interior and exterior of the housing 4; a cooling air passage 190 formed inside the housing 4 that directs air flowing into the air intake 100 to the exhaust 114; and a centrifugal fan 140 (an example of a fan) that generates cooling air flowing from the air intake 100 through the cooling air passage 190 to the exhaust 114. The control device 120 has an upper surface 174 (an example of a first surface) and a lower surface 180 (an example of a second surface) that are opposite to each other. The cooling air passage 190 includes an upper passage portion 190a (an example of a first passage portion) facing the upper surface 174 of the control device 120 and a central passage portion 190c (an example of a second passage portion) facing the lower surface 180 of the control device 120. The upper passage portion 190a and the central passage portion 190c are connected in series. After flowing through the upper passage portion 190a, the cooling air flows in the central passage portion 190c. The flow rate of the cooling air flowing in the upper passage portion 190a is approximately equal to the flow rate of the cooling air flowing in the central passage portion 190c.

[0135] According to the above structure, since the upper passage portion 190a and the central passage portion 190c are connected in series, the flow rate of the cooling air flowing in the upper passage portion 190a (i.e., the first flow rate) is approximately equal to the flow rate of the cooling air flowing in the central passage portion 190c (i.e., the second flow rate). Therefore, the first flow rate and the second flow rate are not inversely related, thus both the first flow rate and the second flow rate can be increased. As a result, the cooling control device 120 can be adequately cooled.

[0136] In one or more embodiments, the cooling air passage 190 further includes a lower passage portion 190e (an example of a third passage portion) passing through the interior of the electric motor 116. Cooling air flows in the upper passage portion 190a, and after flowing through the central passage portion 190c, flows in the lower passage portion 190e.

[0137] According to the above structure, the cooling air can not only cool the control device 120, but also the electric motor 116.

[0138] In one or more embodiments, the chainsaw 2 further includes a motor housing 118 surrounding the outer peripheral surface of the electric motor 116. The control device 120 is configured such that its lower surface 180 is opposite to the motor housing 118.

[0139] According to the above structure, the central passage portion 190c facing the lower surface 180 of the control device 120 and the lower passage portion 190e passing through the interior of the electric motor 116 are positioned close to each other. As a result, the cooling air passage 190 is shortened, thus reducing the pressure loss generated when the cooling air flows through it. Consequently, it is possible to suppress the reduction of cooling air flow due to pressure loss.

[0140] In one or more embodiments, the control device 120 has fins 162 protruding from the upper surface 174 (an example of one of the first and second surfaces).

[0141] According to the above structure, the contact area between the control device 120 and the cooling air is increased by having fins 162. As a result, the control device 120 can be cooled efficiently.

[0142] In one or more embodiments, the upper surface 174 has a first region 182 with fins 162 and a second region 184 without fins 162. The housing 4 has a partition wall 186 separating the first region 182 and the second region 184.

[0143] The first region 182, equipped with fins 162, has higher heat dissipation efficiency compared to the second region 184, which does not have fins 162. According to the above structure, the partition wall 186 can suppress the flow of cooling air towards the second region 184 (i.e., the region with lower heat dissipation efficiency) and promote the flow of cooling air towards the first region 182 (i.e., the region with higher heat dissipation efficiency). This increases the flow rate of cooling air flowing in the first region 182 (i.e., the region with higher heat dissipation efficiency), thus enabling more efficient cooling of the control device 120.

[0144] In one or more embodiments, the control device 120 further includes capacitors 166a, 166b, 166c, 166d, 166e, and 166f protruding from the lower surface 180 (an example of the other of the first and second surfaces).

[0145] According to the above structure, the cooling air flows in contact with the outer surfaces of capacitors 166a, 166b, 166c, 166d, 166e, and 166f. This allows for direct cooling of capacitors 166a, 166b, 166c, 166d, 166e, and 166f.

[0146] In one or more embodiments, capacitors 166a, 166b, 166c, 166d, 166e, and 166f include a first capacitor 166a and a second capacitor 166b. The first capacitor 166a and the second capacitor 166b are offset from each other along the lower surface 180° in a direction orthogonal to the direction of cooling airflow.

[0147] If the first capacitor 166a and the second capacitor 166b are arranged along the direction of the cooling airflow, the capacitor located on the upstream side of the first capacitor 166a and the second capacitor 166b becomes an obstacle, and the cooling air may not reach the capacitor located on the downstream side of the first capacitor 166a and the second capacitor 166b. As a result, it is possible that only one of the first capacitor 166a and the second capacitor 166b is cooled, while the other one is not cooled. In contrast, according to the above structure, the first capacitor 166a and the second capacitor 166b are arranged in a direction orthogonal to the direction of the cooling airflow, so the cooling air reaches both the first capacitor 166a and the second capacitor 166b. Thus, both the first capacitor 166a and the second capacitor 166b can be cooled.

[0148] In one or more embodiments, the cooling air passage 190 includes a right passage portion 190b (an example of a relay passage portion) facing the right surface 178 (an example of an end face) that connects the upper surface 174 and the lower surface 180 of the control device 120. Cooling air flows in the upper passage portion 190a, and after flowing through the right passage portion 190b, flows in the central passage portion 190c.

[0149] According to the above structure, cooling air flows along the three sides of the control device 120 (i.e., the upper surface 174, the lower surface 180, and the right surface 178). As a result, the control device 120 can be cooled efficiently.

[0150] In one or more embodiments, the housing 4 has a second flat wall 198 (an example of a flat wall) which is disposed at the connection between the downstream end of the right passage portion 190b and the upstream end of the central passage portion 190c and extends along the lower surface 180.

[0151] According to the above structure, the cooling air flowing from the right passage portion 190b to the central passage portion 190c can be guided by the second flat wall 198 to flow along the lower surface 180 of the control device 120. As a result, the control device 120 can be cooled efficiently.

[0152] In one or more embodiments, the upper passage portion 190a extends from one end of the upper surface 174 along the upper surface 174 to the other end of the upper surface 174. The central passage portion 190c extends from one end of the lower surface 180 along the lower surface 180 to the other end of the lower surface 180.

[0153] According to the above structure, after the cooling air flows from one end of the upper surface 174 to the other end, it flows from one end of the lower surface 180 to the other end. This increases the contact area between the control device 120 and the cooling air, thus enabling efficient cooling of the control device 120.

[0154] In one or more embodiments, the upper passage portion 190a is opposite to the intake port 100.

[0155] The cooling air that has just flowed into the intake port 100 has not yet taken heat from the components inside the housing 4 and is in a relatively low temperature state. According to the above structure, the cooling air that has just flowed into the intake port 100, that is, the cooling air with a low temperature, flows in the upper passage portion 190a. Therefore, the cooling air takes a large amount of heat from the upper surface 174 of the control device 120. As a result, the control device 120 can be cooled efficiently.

[0156] In one or more embodiments, the upper passage portion 190a extends along the short side of the upper surface 174 of the control device 120. The central passage portion 190c extends along the short side of the lower surface 180 of the control device 120.

[0157] According to the above structure, the upper passage portion 190a is shorter than when the upper passage portion 190a extends along the long side of the upper surface 174 of the control device 120. Furthermore, according to the above structure, the central passage portion 190c is shorter than when the central passage portion 190c extends along the long side of the lower surface 180 of the control device 120. As a result, the cooling air passage 190 is shorter, thus reducing the pressure loss generated when the cooling air flows in the cooling air passage 190. Consequently, it is possible to suppress the reduction of cooling airflow due to pressure loss.

[0158] In one or more embodiments, the chainsaw 2 further includes a filter 102 that is detachably mounted on the housing 4 such that it covers the air intake 100 from the outside of the housing 4.

[0159] According to the above structure, foreign objects (such as chips) can be prevented from entering the interior of the housing 4 from the outside through the air intake 100. Furthermore, according to the above structure, the user can remove the filter 102 from the housing 4 for cleaning.

Claims

1. A work machine, comprising: Operations Department; An electric motor drives the working unit; Control device, which controls the electric motor; A housing that houses the electric motor and the control device; The air intake and exhaust ports connect the interior and exterior of the housing. A cooling air passage, formed inside the housing, directs air flowing into the intake port to the exhaust port; as well as A fan that generates cooling air that flows from the air intake through the cooling air passage to the exhaust port. The control device has a first side and a second side that are opposite to each other. The cooling air passage has a first passage portion facing the first side of the control device and a second passage portion facing the second side of the control device. The first path portion and the second path portion are connected in series. The cooling air flows through the second passage after passing through the first passage section. The flow rate of the cooling air flowing in the first passage section is approximately equal to the flow rate of the cooling air flowing in the second passage section.

2. The work machine according to claim 1, wherein, The cooling air passage also includes a third passage portion passing through the interior of the electric motor, wherein the cooling air flows in the first passage portion, flows in the second passage portion, and then flows in the third passage portion.

3. The work machine according to claim 2, wherein, The machine also has a motor housing surrounding the outer peripheral surface of the electric motor, and the control device is configured such that the second surface is opposite to the motor housing.

4. The work machine according to any one of claims 1 to 3, wherein, The control device has fins protruding from one of the first and second surfaces.

5. The work machine according to claim 4, wherein, One of the first and second surfaces has a first region where the fins are configured and a second region where the fins are not configured, and the outer shell has a partition wall separating the first region and the second region.

6. The operating machine according to claim 4 or 5, wherein, The control device also includes a capacitor protruding from the other of the first and second surfaces.

7. The work machine according to claim 6, wherein, The capacitor includes a first capacitor and a second capacitor, which are offset from each other in a direction along the other of the first and second surfaces and in a direction orthogonal to the direction of the cooling airflow.

8. The work machine according to any one of claims 1 to 7, wherein, The cooling air passage includes a relay passage portion, which faces the end face of the control device that connects the first surface and the second surface. The cooling air flows in the first passage portion and then flows in the second passage portion after passing through the relay passage portion.

9. The work machine according to claim 8, wherein, The housing has a flat wall disposed at the connection between the downstream end of the relay path portion and the upstream end of the second path portion, extending along the second surface.

10. The operating machine according to any one of claims 1 to 9, wherein, The first passage portion extends from one end of the first surface along the first surface to the other end of the first surface, and the second passage portion extends from one end of the second surface along the second surface to the other end of the second surface.

11. The work machine according to any one of claims 1 to 10, wherein, The first passage portion is opposite to the air intake.

12. The work machine according to any one of claims 1 to 11, wherein, The first passage portion extends along the short side of the first surface of the control device, and the second passage portion extends along the short side of the second surface of the control device.

13. The work machine according to any one of claims 1 to 12, wherein, The machine also features a filter that is detachably mounted on the housing in such a way that it covers the air intake from the outside of the housing.

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