power tools

Abstract

The present invention provides an electric tool. In an electric tool such as a trimmer, when a power cable is wrapped around the side of a controller that becomes a heat source, it is necessary to implement heat-shielding measures for the power cable. In the present disclosure, the purpose is to implement heat-shielding measures for the controller without hindering the compactness of the power cable wrapping. A groove (23) is provided on the side of a controller housing (21). A plurality of protrusions (24) are provided on the inner wall of the groove (23). The plurality of protrusions (24) limit the power cable (9) from contacting the outer surface of the controller housing (21).

Description

Technical Field

[0001] The present disclosure relates to power tools such as trimmers used in woodworking. Background Art

[0002] Laminate trimmers, primarily used for trimming and grooving wood, are disclosed in patent documents (Japanese Patent Application Publication No. 11-164579 and Japanese Patent Application Publication No. 2012-196866). The trimmer is constructed by housing an electric motor within a cylindrical housing of sufficient thickness to be held in one hand. The electric motor is internally mounted with the motor axis aligned longitudinally with the axis of the housing. A tool, rotated by the electric motor, protrudes downward from a base mounted on the lower portion of the housing. While the housing is held in one hand with the base in contact with the upper surface of the workpiece, the tool is moved along the edge to perform the trimming process.

[0003] As disclosed in the patent document, the upper portion of the housing houses a controller primarily used to control the operation of the electric motor. The controller is flat and housed above the electric motor, with its thickness aligned with the motor axis. A power cable (rubber-insulated cable) is inserted into the upper portion of the housing. The power cable is introduced from the upper portion of the housing and passes vertically and lateral to the controller, forming a compact loop. Summary of the Invention

[0004] Such tightly packed power cables are susceptible to heat from the controller. Traditionally, no special heat shielding measures have been implemented for power cables routed close to the controller. This disclosure aims to implement heat shielding measures for the controller, including various wiring types such as power cables and signal cables, or for specific components requiring heat shielding measures for other controllers.

[0005] According to one aspect of the present disclosure, an electric tool includes a controller that controls the operation of, for example, an electric motor. The electric motor and the controller are covered by a housing. A plurality of protrusions protrude from the outer surface of the controller. Power is supplied to the electric motor, and the plurality of protrusions are in contact with or capable of contacting a portion of a power cable located within the housing. This limits contact between the power cable and the outer surface of the controller. Consequently, heat applied to the power cable from the controller can be suppressed.

[0006] According to another aspect of the present disclosure, a power tool includes a controller, for example, for controlling the operation of an electric motor. A groove is formed on an outer surface of the controller. A component is accommodated in the groove. Multiple protrusions protrude from the wall of the groove. The multiple protrusions are in contact with or capable of contacting the component. Thus, the multiple protrusions restrict contact between the component and the outer surface of the controller.

[0007] This reduces the amount of heat applied to the components by the controller. Components are various components located close to the controller and whose thermal effects from the controller must be reduced. These components include, in addition to rubber-insulated cables such as power cables or DC power cables, signal lines routed within the housing, electrical components such as switches, positioning ribs on the housing, and protective components for shock absorption or dust protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a front view of the dresser of the embodiment.

[0009] Figure 2 It is a right side view of the dresser of embodiment.

[0010] Figure 3 It is a longitudinal sectional view of the dresser of the embodiment.

[0011] Figure 4 This figure shows a perspective view of the dresser according to the embodiment, viewed from the upper right.

[0012] Figure 5 This is a top view of the dresser main body. This figure shows the state where the upper cover is removed.

[0013] Figure 6 This is a perspective view of the controller itself.

[0014] Figure 7 yes Figure 5 Enlarged view of part VII.

[0015] Figure 8 This figure shows a longitudinal section of a groove.

[0016] Figure 9 This figure shows another embodiment. This figure shows a battery-type electric power tool and a battery pack.

[0017] Figure 10 This figure shows a cross section of a component. DETAILED DESCRIPTION

[0018] like Figures 1 to 3As shown, in this embodiment, a portable woodworking cutting tool called a trimmer is illustrated as an electric tool 1. In addition, an AC power supply type electric tool 1 is illustrated. The electric tool 1 has a cylindrical motor housing 2. An electric motor 10 is installed inside the inner side of the motor housing 2. The electric motor 10 is housed in a posture in which its longitudinal direction (motor axis direction) is consistent with the longitudinal direction of the motor housing 2. An upper housing 4 is connected to the upper part of the motor housing 2 via a circular bracket 3. The bracket 3 and the upper housing 4 are connected to the upper part of the motor housing 2 by four connecting screws 2a.

[0019] The electric motor 10 is a brushed motor having a stator 11 fixed along the inner circumference of the motor housing 2 and a rotor 12 rotatably supported by the inner circumference of the stator 11. The rotor 12 is integrally coupled to an output shaft 13. A cooling fan 19 is fixed below the rotor 12 and to the output shaft 13. The rotor 12, output shaft 13, and cooling fan 19 rotate integrally.

[0020] The electric motor 10 is housed within the motor housing 2 in a position such that the axis of the output shaft 13 (motor axis J) is aligned with the axis of the motor housing 2 (upward direction). The output shaft 13 protrudes from both the upper and lower portions of the rotor 12. The upper portion of the output shaft 13 is supported by a bearing 14 so as to be rotatable relative to the bracket 3. The lower portion of the output shaft 13 is supported by a bearing 15 so as to be rotatable relative to the motor housing 2. The lower portion of the output shaft 13 protrudes downward from the lower portion (first end portion) of the motor housing 2. The tool 7 is coaxially mounted to the lower portion of the output shaft 13.

[0021] A rectifier 16 is provided on the upper portion of the rotor 12. Figure 2 、 Figure 4 As shown, a brush holder 17 holding a brush is attached to the side of the commutator 16 and the side of the bracket 3 .

[0022] A rectangular base 5 is mounted below the motor housing 2. A cutter 7 protrudes from the bottom surface of the base 5. The base 5 abuts the top surface of the workpiece W, and the protruding portion of the cutter 7 abuts along the edge of the workpiece W to perform trimming, or the cutter 7 cuts into the edge to perform grooving.

[0023] A base mounting portion 6 is integrally provided on the upper surface of the base 5. The base mounting portion 6 has a C-shape. The base mounting portion 6 is fixed along the outer peripheral surface of the motor housing 2 by tightening the knob screw 6a. Thus, the base 5 is fixed to the lower side of the motor housing 2. The fixed state of the base mounting portion 6 relative to the motor housing 2 can be loosened by loosening the knob screw 6a. By loosening the fixed state, the upper and lower positions of the base 5 relative to the motor housing 2 can be adjusted. By changing the upper and lower positions of the base 5, the protrusion amount of the tool 7 from the base 5 can be adjusted. Thus, for example, the depth of the grooving process can be adjusted.

[0024] The base mounting portion 6 is provided with a fine-tuning disc gear (wheel gear) 6b and a rotary dial 6c. Rotating the rotary dial 6c causes the disc gear 6b to rotate integrally. The disc gear 6b meshes with the rack gear portion 2b provided on the outer surface of the motor housing 2. Rotating the rotary dial 6c after the fixed position is loosened causes the disc gear 6b to rotate, thereby changing the position of engagement with the rack gear portion 2b. This causes the base 5 and the base mounting portion 6 to move vertically integrally, thereby fine-tuning the vertical position of the base 5.

[0025] A window 6d is provided on the lower front surface of the base mounting portion 6, allowing workers to view the work area. Furthermore, a hand tool such as a wrench can be inserted through the window 6d to attach and detach the tool 7 from the output shaft 13. A clearance 5a is provided in the center of the base 5, through which the output shaft 13 and tool 7 pass. The clearance 5a exposes the work area upward.

[0026] The upper housing 4 supports a starter switch 8 for start / stop operations and a power cable 9 for supplying AC power. An operating recess 4a, open upward and forward, is provided in the front portion of the upper housing 4. An operating lever 8a for the starter switch 8 protrudes from the operating recess 4a. By inserting a finger into the operating recess 4a and tilting the operating lever 8a left or right, the electric motor 10 can be started or stopped. The operating lever 8a is positioned within the operating recess 4a and does not protrude from the outer shell of the upper housing 4, thereby preventing accidental operation of the operating lever 8a.

[0027] The power cable 9 uses a so-called cabtyrecode cable, consisting of two power wires 9b and 9c covered in a rubber layer. The end of the power cable 9 has a power plug 9d for connecting to an AC power source (not shown). The power cable 9 is supported on the rear side of the upper housing 4 so that it protrudes upward from its top surface. A cable guard 9a is provided at the base of the power cable 9 (the portion supported by the upper housing 4).

[0028] The power cable 9 is looped inside the upper housing 4 so as to pass through the side of the controller 20 in the thickness direction from the top to the bottom. Figure 3 、 Figure 4 As shown, the rubber covering of the power cable 9 is removed at a position below the controller 20, exposing two power lines 9b and 9c. One power line 9b is connected to the power terminal 8b of the start switch 8. The other power line 9c is connected to the terminal block 18 arranged on the side of the controller 20. Figure 4 The terminal block 18 is shown in FIG.

[0029] The controller 20 primarily controls the electric motor 10's rotation, soft start, and other operational functions. The controller 20 is located above the electric motor 10 (on the side opposite the first end) inside the upper housing 4. The controller 20 includes a generally circular controller housing 21. The controller housing 21 houses a controller substrate 22. Various resistors and capacitors are mounted on the controller substrate 22. Therefore, the controller substrate 22 becomes a relatively large heat source.

[0030] like Figures 4 to 6 As shown, two LEDs (light emitting diodes) 22a and 22b are mounted on the controller substrate 22. One LED 22a emits green light, and the other LED 22b emits red light. In the power supply state where the power plug 9d of the power cable 9 is connected to an AC power source (for example, a power socket on the wall), the LED 22a lights up in green. If the start switch 8 is turned on in the green lit state, the electric motor 10 starts. Thus, cutting work can be performed. In contrast, if the power cable 9 is connected to the AC power source in the state where the start switch 8 is turned on, the LED 22b flashes in red. In the red flashing state, the electric motor 10 does not start. Thus, for example, the power tool 1 can be prevented from being accidentally restarted after the power failure is restored. In this way, in the controller 20, action control is performed to prevent the electric motor 10 from being accidentally restarted. The restart prevention function is not limited to the AC power supply type, and can also be applied to the battery-type power tool 30 described later.

[0031] like Figures 3 to 6 As shown, a slot 23 for passing the power cable 9 is provided at the rear of the controller housing 21. The slot 23 is recessed in a U-shape from the side of the controller housing 21 toward the inside. The slot 23 penetrates the controller housing 21 in the thickness direction (vertical direction).

[0032] like Figure 7 As shown, the groove 23 has a semicircular bottom surface 23a within. A flat first wall 23b and a flat second wall 23c extend rearward from either side of the bottom surface 23a. The first and second walls 23b and 23c are parallel and opposed to each other. Multiple protrusions are provided on the bottom surface 23a and the first wall 23b to limit contact with the power cable 9. In this embodiment, the first, second, and third protrusions 24, 25, and 26 are exemplified as the multiple protrusions.

[0033] Two first protrusions 24 and one second protrusion 25 are provided on the semicircular bottom surface 23a. The first protrusion 24 is arranged in the center and on the right side of the bottom surface 23a. The second protrusion 25 is arranged on the left side of the bottom surface 23a. The first protrusion 24 and the second protrusion 25 extend toward the center of curvature C of the bottom surface 23a. The extension length (first length) of the first protrusion 24 and the extension length (second length) of the second protrusion 25 are different. In this embodiment, for example, the extension length of the first protrusion 24 is set to 2 mm, and the extension length of the second protrusion 25 is set to 1 mm. Therefore, as shown in the figure, the two first protrusions 24 abut the power cable 9 located at the center of curvature C, but the second protrusion 25 on the left cannot reach the power cable 9. If the power cable 9 moves to the left from the center of curvature C, the first protrusion 24 and the second protrusion 25 on the left abut, but the first protrusion 24 on the right cannot reach.

[0034] The power cable 9 is positioned at the center of curvature C and abuts the two first protrusions 24, thereby restraining the power cable 9 at a maximum distance (2 mm in this embodiment) from the bottom surface 23a. In this embodiment, assuming that a large heat source exists in the direction opposite to the extension direction of the two first protrusions 24 (from the front to the right), two first protrusions 24 with large extension lengths are arranged.

[0035] A third protrusion 26 is provided on the first flat wall 23b on the right side. The first flat wall 23b extends 2 mm and extends perpendicularly toward the second flat wall 23c. The third protrusion 26 also limits the power cable 9 from approaching the aforementioned large heat source (contact with the first flat wall 23b). The protrusion is omitted from the second flat wall 23c. This ensures the ease of assembly of the power cable 9 relative to the slot 23 (ease of insertion into the slot 23).

[0036] In this embodiment, the first to third protrusions 24, 25, and 26 extend across the entire vertical area of the bottom surface 23a or the first flat wall 23b (the thickness direction of the controller housing 21). The extended distal ends of the first to third protrusions 24, 25, and 26 are formed into a curved surface with a semicircular cross-section.

[0037] Various changes can be made to the above-described embodiments. Figure 8 As shown, the plurality of protrusions provided in the groove 23 may be provided in addition to or instead of the first to third protrusions 24, 25, and 26 exemplified above, a hemispherical protrusion 27 may be provided. Alternatively, a plurality of protrusions 27 may be arranged side by side in the vertical direction on the bottom surface 23a of the groove 23 and the first and second flat walls 23b and 23c.

[0038] Alternatively, the second flat wall 23c may have protrusions (convex portions) but not the first flat wall 23b; or both the first and second flat walls 23b and 23c may have protrusions (convex portions); or no protrusions (convex portions) may be provided. The extent of each protrusion (convex portion) can be adjusted appropriately to suit the location and spread of the heat source.

[0039] Furthermore, although the electric tool 1 is illustrated as being powered by a commercial 100V AC power source, the configuration of a DC power source type trimmer or a processing machine (router) powered by a rechargeable battery as illustrated can also be applied. Figure 9 As shown, in the case of a battery-powered power tool 30, a DC power cable 31 is used as a power cable. A battery adapter 33 equipped with a battery pack 32 is connected to the power circuit via the DC power cable 31. The battery pack 32 can be removed from the battery adapter 33 for charging, thereby forming a reusable structure. The battery adapter 33 is provided with a hook 33a for pre-hooking on the worker's belt. For such a battery-powered power tool 30, heat protection measures are also implemented for the DC power cable 31 surrounding the side of the controller 34 as shown in the above example.

[0040] In addition, the heat protection measures are not limited to the power cable 9 or the DC power cable 31, and the heat protection measures exemplified above can also be implemented for other components. Figure 10 The rib 4b shown can be applied to the upper housing 4. The rib 4b is inserted into the groove 23 of the controller case 21. The inner wall surface of the groove 23 is provided with a convex portion 28 with a short protrusion length and a convex portion 29 with a longer protrusion length than the convex portion 28.

[0041] Two short protrusions 28 are provided on the bottom surface 23a of the groove 23. Two long protrusions 29 are provided on the first flat wall 23b. A short protrusion 28 is provided on the second flat wall 23c. As shown in the figure, the end portions of a part or all of the protrusions 28 and 29 can be arc-shaped curved surfaces or flat surfaces. In addition, similar to the case of the power cable 9, the protrusions 28 and 29 can be protrusions or hemispherical protrusions. In addition, the protruding length of the protrusions 28 and 29 can be appropriately changed. The above structure limits the contact between the rib 4b and the controller housing 21. Thus, heat protection measures for the rib 4b are implemented.

[0042] The illustrated embodiment can be further modified. For example, the electric motor 10 is not limited to a brushed motor, but may be a brushless motor.

[0043] In addition, as the power tool 1, a trimmer used for relatively light cutting operations that is often held and moved with one hand is illustrated, but the illustrated heat protection measures can also be applied to power cables or components of processing machines used for relatively heavy cutting operations that are held and moved with both hands.

[0044] According to one aspect of the present disclosure, the electric tool 1 has a controller 20 that performs, for example, motion control of the electric motor 10. The electric motor 10 and the controller 20 are covered by a housing (motor housing 2). A plurality of protrusions 24 to 29 protrude from the outer surface of the controller 20 (controller housing 21). Power is supplied to the electric motor 10, and the plurality of protrusions 24 to 29 are in contact with or capable of contacting a portion of the power cable located within the housing. Thus, contact between a portion of the power cable 9 and the outer surface of the controller 20 (controller housing 21) is restricted.

[0045] Therefore, by restricting the power cable 9 from coming into contact with the controller 20 , it is possible to suppress the thermal influence of the controller 20 on the power cable 9 .

[0046] According to other aspects of the present disclosure, the electric tool 1 has a controller 20 that controls the operation of the electric motor 10, for example. A groove 23 is formed on the outer surface of the controller 20. The component (rib 4b) is accommodated in the groove 23 of the controller 20. A plurality of protrusions 24 to 29 protrude from the wall surface (bottom surface 23a, first flat wall 23b, second flat wall 23c) of the groove 23 of the controller 20. The plurality of protrusions 24 to 29 are in contact with or can be in contact with the component (rib 4b). Contact with the outer surface of the controller 20 is limited by the plurality of protrusions 24 to 29.

[0047] Therefore, by limiting the contact between the rib 4b, which is a component, and the outer surface of the controller 20, the thermal influence of the controller 20 on the rib 4b can be suppressed. Components are various components that are arranged close to the controller 20 and whose thermal influence on the controller 20 needs to be suppressed. Components include, for example, the rubber insulated cable or DC power cable 31 serving as the power cable 9, signal lines routed within the motor housing 2 or the upper housing 4, electrical components such as switches, and protective components for shock absorption or dust prevention.

[0048] According to one or more embodiments, for example, the power cable 9 is a rubber-insulated cable for supplying AC power, or a DC power cable 31 for supplying DC power. Therefore, heat protection measures can be implemented for the power cable 9 in the case of an AC-powered power tool 1, or heat protection measures can be implemented for the power cable 31 in the case of a battery-powered power tool 30DC.

[0049] According to one or more embodiments, the plurality of protrusions include a first protrusion (first protrusion 24) protruding from the outer surface of the controller 20 at a first length. The plurality of protrusions include a second protrusion (second protrusion 25) protruding from the outer surface of the controller 20 at a second length different from the first length. Therefore, the assembly performance of the power cable 9 or its components is ensured.

[0050] According to one or more embodiments, for example, each of the plurality of protrusions 24 to 29 has a curved tip. This reduces the area of contact between the protrusions and the power cable 9 or component (rib 4b). This allows for more efficient heat shielding of the power cable 9 or component (rib 4b). Furthermore, the curved tip minimizes damage to the power cable 9 or component (rib 4b).

[0051] According to one or more embodiments, for example, a groove 23 is provided on the side of the controller 20, extending through the thickness of the controller 20. Multiple protrusions 24 to 29 are provided on the walls (bottom 23a, first flat wall 23b, and second flat wall 23c) of the groove 23. This provides heat protection for the power cable 9 or components (ribs 4b) that pass through the sides of the controller 20 in the thickness direction.

[0052] According to one or more embodiments, at least one of the plurality of protrusions 24 to 29 is a protrusion extending in the thickness direction. This more reliably prevents the power cable 9 or components (rib 4 b ) from contacting the outer surface of the controller 20 .

[0053] According to one or more embodiments, for example, the groove 23 is formed in a U-shape from the side of the controller 20 toward the inside. The groove 23 has an arcuate bottom surface 23a and two opposing flat walls 23b and 23c extending from opposite ends of the bottom surface 23a. The plurality of protrusions 24-26 include a first protrusion 24 and a second protrusion 25 extending from the bottom surface 23a toward the center of curvature C of the bottom surface 23a, and a third protrusion 26 extending perpendicularly from the first flat wall 23b toward the second flat wall 23c.

[0054] Therefore, contact is more reliably restricted at the bottom surface 23a side (inner side) of the groove 23. The third protrusion 26 protrudes from the mutually opposing first flat walls 23b of the groove 23 toward the second flat wall 23c, thereby allowing the power cable 9 or the component (rib 4b) to be appropriately offset relative to the groove 23, thereby ensuring the assembly performance of the power cable 9 or the component (rib 4b) relative to the groove 23.

[0055] According to one or more embodiments, for example, the first and third protrusions extend by a first length, while the second protrusion extends by a second length that is shorter than the first length. Therefore, by varying the protrusion extension in accordance with heat distribution, it is possible to ensure proper assembly of the power cable or component within the slot while providing more effective heat protection.

[0056] According to one or more embodiments, for example, the housing covering the electric motor (motor housing 2) has a cylindrical shape extending in a longitudinal direction aligned with the longitudinal direction of the electric motor 10 (the direction of the motor axis J). The electric motor 10 has an output shaft 13 at a first end in the longitudinal direction (the lower end in the direction of the motor axis J). The controller 20 is located on the opposite side of the electric motor 10 from the first end. Therefore, for cutting tools such as dressers and processing machines, heat shielding measures are implemented for the power supply cable 9 or components (ribs 4b) with respect to the controller 20.

[0057] According to one or more embodiments, the power tool 1 is a portable woodworking cutter. Therefore, for the power tool 1 called a trimmer or a processing machine and a portable woodworking cutter, heat shielding measures are implemented for the power cable 9 or the component (rib 4b) with respect to the controller 20.

[0058] The power cable 9 (rubber insulated cable) and DC power cable 31 of this embodiment are examples of power cables according to one or other aspects of the present disclosure. The rib 4b of the upper housing 4 of other embodiments are examples of components according to other aspects of the present disclosure. The electric motor 10 of this embodiment is an example of an electric motor according to one or other aspects of the present disclosure.

[0059] The motor housing 2 of this embodiment is an example of a housing in one aspect or another aspect of the present disclosure. The controller housing 21 of this embodiment is an example of a controller housing in one aspect or another aspect of the present disclosure. The first protrusion 24, second protrusion 25, third protrusion 26, and protrusions 27 to 29 of this embodiment are examples of multiple protrusions in one aspect or another aspect of the present disclosure.

[0060] Description of reference numerals:

[0061] W...Workpiece; 1...Power tool (dresser); 2...Motor housing; 2a...Joining screw; 2b...Rack and pinion portion; 3...Bracket; 4...Upper housing; 4a...Operation recess; 4b...Rib; 5...Base; 6...Base mounting portion; 6a...Knob screw; 6b...Disc gear; 6c...Knob dial; 6d...Window; 7...Tool; 8...Start switch; 8a...Operating lever; 8b...Power terminal; 9...Rubber insulated cable (power cord); 9a...Cable protector; 9b, 9c...Power cord; 9d...Power plug; 10...Electric motor; 11...Stator; 12...Rotor; 13...Output shaft; 14, 15... Bearing; 16...Rectifier; 17...Brush holder; 18...Terminal block; 19...Cooling fan; 20...Controller; 21...Controller housing; 22...Controller substrate; 22a...LED (green); 22b...LED (red); 23...Slot; 23a...Bottom; 23b...First flat wall; 23c...Second flat wall; C...Center of curvature; 24...First protrusion (convex portion); 25...Second protrusion (convex portion); 26...Third protrusion (convex portion); 27, 28, 29...Convex portion; 30...Power tool (battery type); 31...DC power cable (power cable); 32...Battery pack; 33...Battery adapter; 33a...Hook; 34...Controller.

Claims

1. An electric tool, wherein: have: a controller for controlling the motion of the electric motor; a housing covering the electric motor and the controller; a plurality of protrusions protruding from an outer surface of the controller; as well as a power cable for supplying power to the electric motor, A groove is provided on the side of the controller and passes through the controller in the thickness direction. The groove is formed in a U shape from the side of the controller toward the inside. The groove has an arc-shaped bottom surface and two flat walls extending from both ends of the bottom surface and facing each other, namely a first flat wall and a second flat wall. The plurality of protrusions are provided on the wall surface of the groove, At least one of the plurality of protrusions is a protrusion extending from the first flat wall toward the second flat wall perpendicular to the first flat wall and extending along the thickness direction. The plurality of protrusions restricts a portion of the power cable located within the housing from contacting the outer surface of the controller.

2. The electric tool according to claim 1, wherein The power cable is a rubber insulated cable for AC power supply or a DC power cable for DC power supply.

3. The electric tool according to claim 1 or 2, wherein: The plurality of protrusions include a first protrusion protruding from the outer surface of the controller with a first length, and a second protrusion protruding from the outer surface of the controller with a second length different from the first length.

4. The electric tool according to claim 1 or 2, wherein: The plurality of convex portions each have a curved end.

5. The electric tool according to claim 1 or 2, wherein: The plurality of protrusions include first and second protrusions extending from the bottom surface toward the center of curvature of the bottom surface, and third protrusions constituting the protrusions extending from the first flat wall toward the second flat wall perpendicularly thereto.

6. The electric power tool according to claim 5, wherein: The first protrusion and the third protrusion extend by a first length, and the second protrusion extends by a second length that is shorter than the first length.

7. The electric tool according to claim 1 or 2, wherein: The housing covering the electric motor is cylindrical and extends in a longitudinal direction consistent with the longitudinal direction of the electric motor. The electric motor has an output shaft at a first end portion in the longitudinal direction. The controller is disposed on a side of the electric motor opposite to the first end.

8. The electric tool according to claim 1 or 2, wherein: The electric tool is a portable woodworking cutting machine.

9. An electric tool, wherein: have: A controller for controlling the motion of the electric motor; a groove formed on an outer surface of the controller; a component received in the groove; as well as a plurality of protrusions that protrude from the wall surface of the groove of the controller and contact or are capable of contacting the constituent components, thereby restricting the constituent components from contacting the outer surface of the controller, The groove passes through the side of the controller along the thickness direction of the controller. The groove is formed in a U shape from the side of the controller toward the inside. The groove has an arc-shaped bottom surface and two flat walls extending from both ends of the bottom surface and facing each other, namely a first flat wall and a second flat wall. At least one of the plurality of protrusions is a protrusion extending from the first flat wall toward the second flat wall perpendicular to the first flat wall and extending along the thickness direction.

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