Work machine

Abstract

To achieve an effective arrangement of a controller.SOLUTION: In a circular saw 10, a body housing 23 includes: a handle 29 extending in a front-back direction; a battery attachment part 26 provided rearward of a motor 41 and below the handle 29; and a controller storage part 25 disposed above the battery attachment part 26. A battery pack 50 is attached to the battery attachment part 26 and the battery pack 50 is disposed above a base 12. Further, a controller 60 is stored in the controller storage part 25 and the rear end of the controller 60 is sandwiched in a vertical direction by the battery pack 50 and the rear connection part 29A of the handle 29. The structure enables the rear connection part 29A of the handle 29 located above the controller 60 to be used as an arrangement space for arranging a part of the controller 60. Thus, the structure can achieve an effective arrangement of the controller 60.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] In the circular saw (working machine) described in Patent Document 1 below, a brushless motor is housed in a housing, a battery pack is attached to the housing, and power is supplied from the battery pack to the brushless motor. Further, a control board (controller) for controlling the motor is housed in the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in a working machine such as the above circular saw, since relatively tall control components are mounted on the control board, it is necessary to secure a wide arrangement space for arranging the control board. For this reason, depending on the arrangement position of the control board, there is a possibility of increasing the size of the working machine.

[0005] Further, the control board is usually housed in a case from the viewpoints of improving assemblability and dust resistance. Furthermore, from the viewpoint of improving the cooling performance of the control components mounted on the control board, the case is made of metal. For this reason, for example, when static electricity generated during operation is applied to the case from the ventilation holes of the housing, it may affect the operation of the working machine. As described above, in a working machine, it is desirable to arrange the controller at an effective position.

[0006] An object of the present invention is to provide a working machine capable of realizing an effective arrangement of a controller in consideration of the above facts.

Means for Solving the Problems

[0007] One or more embodiments of the present invention include a base that slides forward on a workpiece during machining, a housing provided above the base, a rotor that rotates with the left-right direction as the axial direction, a motor housed in the housing, a controller that controls the motor, an output shaft to which a tip tool is attached and that is driven by the motor, and a battery that supplies power to the motor. The housing includes a handle extending in the front-rear direction, a battery mounting portion provided on the rear side of the motor and below the handle for mounting the battery, and a controller housing portion provided above the battery mounting portion for housing the controller. At least a part of the controller is sandwiched in the vertical direction between the battery and the rear end portion of the handle.

[0008] One or more embodiments of the present invention are work machines in which the controller includes a concave case that is open upward and a control board housed in the case, and wiring extending from the control board is arranged in the front-rear direction above the case.

[0009] One or more embodiments of the present invention are work machines in which the housing has a communication space extending in the vertical direction on the front side of the controller housing portion, the controller housing portion extends in the front-rear direction, the rear end portion of the handle communicates with the upper rear end portion of the controller housing portion, the communication space communicates with the upper front end portion of the controller housing portion, and the controller is disposed in the lower portion of the controller housing portion.

[0010] One or more embodiments of the present invention are work machines in which the controller includes a concave case that is open upward and a control board housed in the case and having control components mounted thereon that project upward from the case, and the upper end portions of the control components are located within the rear end portion of the handle.

[0011] One or more embodiments of the present invention are work machines in which a terminal holder for holding a terminal connected to the battery is provided in the battery mounting portion, and the communication space is located in front of the terminal holder.

[0012] One or more embodiments of the present invention are work machines in which the terminal has a terminal portion to which wiring is connected, the terminal portion is located in front of the controller, the wiring extends upward from the terminal portion, and is routed in front of the controller.

[0013] One or more embodiments of the present invention are work machines in which the handle is provided with a trigger and a trigger switch pressed by the trigger, and wiring extending upward from the rear end portion of the controller passes through the rear end portion of the handle and is routed inside the handle and connected to the trigger switch.

[0014] One or more embodiments of the present invention are work machines in which battery cells extending in a direction perpendicular to the axial direction of the motor are housed inside the battery, and the entire battery cells are located in the vertical direction between the axis of the rotation axis of the motor and the base.

[0015] One or more embodiments of the present invention are work machines in which the controller has a metal case opened upward and a control board housed in the case, a fan that generates cooling air by rotating by driving the motor is provided in front of the controller, a ventilation port that communicates the inside and outside of the controller housing portion is formed in the side wall of the controller housing portion, the ventilation port is disposed above the case, and the cooling air passes through the ventilation port.

[0016] One or more embodiments of the present invention are such that the housing includes a motor housing that houses the motor and the fan, and a communication space that communicates with the controller housing on the front side of the controller housing. A communication part that communicates the communication space with the inside of the motor housing is formed in the motor housing, and the communication part is a working machine located below the controller housing.

[0017] One or more embodiments of the present invention are such that the battery mounting part is provided with a terminal connected to the battery and a terminal holder that holds the terminal. The terminal has a terminal part that protrudes forward from the terminal holder, and the terminal part is a working machine located in the communication space.

[0018] One or more embodiments of the present invention are a working machine in which the nominal voltage of the battery is 13 V or less.

[0019] One or more embodiments of the present invention are such that a guide wall is provided on the front side of the controller in the housing, and the guide wall is a working machine that guides the flow of the cooling air along the vertical direction.

[0020] One or more embodiments of the present invention are such that an air vent wall part that constitutes the lower wall of the air vent protrudes from the side wall of the controller housing to the inside of the controller housing and is disposed above the peripheral wall of the case. The tip of the air vent wall part is located inside the controller housing more than the peripheral wall located below the air vent wall part, and it is a working machine.

[0021] One or more embodiments of the present invention include a base that slides forward on a workpiece during machining, a housing provided above the base, a rotor that rotates about an axis parallel to a plane extending in the front-rear, left-right directions, a motor housed in the housing, a controller that controls the motor, an output shaft to which a tip tool is attached and that is driven by the motor, and a battery that supplies power to the motor. The housing includes a handle positioned above the motor, a battery mounting portion provided behind the motor and below the handle to which the battery is mounted, and a controller housing portion provided above the battery mounting portion to house the controller. The housing has a loop structure including the handle and the controller housing portion. The controller has control components protruding upward, and at least a part of the control components is located above the inner peripheral surface of the upper wall of the controller housing portion, which is a working machine.

Advantages of the Invention

[0022] According to one or more embodiments of the present invention, an effective arrangement of the controller can be realized.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0024] Hereinafter, with reference to the drawings, a circular saw 10 as a working machine according to the present embodiment will be described. In the drawings, arrows UP, FR, and LH shown as appropriate indicate the upper side, the front side, and the left side of the circular saw 10, respectively. In the following description, when the up-down, front-rear, and left-right directions are used for explanation, unless otherwise specified, they indicate the up-down direction, the front-rear direction, and the left-right direction of the circular saw 10.

[0025] The circular saw 10 is a power tool for performing cutting work on a workpiece. Specifically, by placing the circular saw 10 on the workpiece and moving it forward with respect to the workpiece, cutting work on the workpiece is performed.

[0026] As shown in FIGS. 1 to 3, the circular saw 10 includes a base 12 and a circular saw body 18 (which is an element grasped as a working machine body in a broad sense).

[0027] (Regarding the base 12) The base 12 is made of metal and is formed in a substantially rectangular plate shape with the vertical direction being the plate thickness direction and the front-rear direction being the longitudinal direction. The lower surface of the base 12 is a sliding surface 12A. During the cutting process of the circular saw 10, the sliding surface 12A is placed on the workpiece and slides on the workpiece.

[0028] As shown in FIG. 6, a through-hole 12B for arranging a circular saw blade 14 as a tip tool is formed through the right part of the base 12. The through-hole 12B is formed in a substantially rectangular shape with the front-rear direction being the longitudinal direction. Here, the circular saw blade 14 is formed in a substantially disc shape with the left-right direction being the plate thickness direction, and the central part of the circular saw blade 14 is fixedly and integrally rotatably fixed to the output shaft 45 of a drive mechanism 40 described later. The circular saw blade 14 is arranged in the through-hole 12B, the upper part of the circular saw blade 14 protrudes upward from the base 12, and the lower end side part of the circular saw blade 14 protrudes downward from the base 12.

[0029] (Regarding the circular saw body 18) As shown in FIGS. 1 to 6, the circular saw body 18 includes a housing 20, a drive mechanism 40, a battery pack 50 as a battery, and a controller 60.

[0030] (Regarding the housing 20) The housing 20 is composed of a plurality of housing members, forms the outer shell of the circular saw body 18, and is arranged above the base 12. The housing 20 includes a saw cover 21 that constitutes the right part of the housing 20, a motor housing 22 and a main body housing 23 that constitute the left part of the housing 20.

[0031] The soc bar 21 is formed in a substantially semi-circular plate shape with the left-right direction as the thickness direction and convex upward, and is formed in a concave shape that is open downward. And the upper part of the circular saw blade 14 is accommodated in the soc bar 21 and covered by the soc bar 21. Also, the front end portion of the soc bar 21 is connected to the base 12 by the front-side connection mechanism 15, and the rear end portion of the soc bar 21 is connected to the base 12 by the rear-side connection mechanism 16, and the housing 20 is connected to the base 12. At the lower end portion of the left wall of the soc bar 21, a substantially cylindrical cover tube portion 21A (see FIGS. 5 and 6) protruding to the left is formed at the middle portion in the front-rear direction.

[0032] The motor housing 22 is formed in a substantially bottomed cylindrical shape that is open to the right as a whole. The motor housing 22 is composed of housing members divided into two in the front-rear direction, and the motor housing 22 is formed by assembling these housing members to each other. The motor housing 22 is disposed on the left side of the cover tube portion 21A of the soc bar 21 and is fastened and fixed to the cover tube portion 21A. A plurality of motor-side ventilation holes 22A are formed penetrating in the left-right direction in the left wall of the motor housing 22. The motor-side ventilation holes 22A are formed in a long hole shape with the substantially front-rear direction as the longitudinal direction, and are arranged side by side in the vertical direction at the front end portion and the rear end portion of the left wall of the motor housing 22. A communication portion 22B (see FIGS. 7 and 10) is formed at the middle portion in the left-right direction in the rear wall of the motor housing 22. The communication portion 22B is formed in a cylindrical shape with the front-rear direction as the axial direction and protrudes rearward from the rear wall of the motor housing 22. The inside of the communication portion 22B penetrates in the front-rear direction. Thereby, the inside of the motor housing 22 is opened rearward by the communication portion 22B.

[0033] The main body housing 23 is composed of housing members divided into two in the left-right direction, and the main body housing 23 is formed by assembling these housing members to each other. The main body housing 23 has a lower housing 24 that constitutes the lower part of the main body housing 23 and a handle 29 that constitutes the upper part of the main body housing 23.

[0034] As shown in FIGS. 1 to 10, the lower housing 24 is formed in a substantially hollow box shape that is open to the front side and is disposed on the rear side of the right portion of the motor housing 22. A cover portion 24A extending forward is formed on the upper wall of the lower housing 24, and the cover portion 24A is formed in a substantially concave shape that is open downward. And the lower housing 24 including the cover portion 24A is disposed on the rear side of the motor housing 22 so as to cover the right portion of the motor housing 22 from the front side, the upper side, and the rear side. Further, the front portion of the lower housing 24 is fastened and fixed to the cover cylinder portion 21A of the sock cover 21. Note that the communication portion 22B of the motor housing 22 is disposed inside the lower housing 24, and the inside of the lower housing 24 and the inside of the motor housing 22 are communicated by the communication portion 22B (see FIGS. 7 and 10). Furthermore, the lower end portion of the lower housing 24 is turned upward except for the front end portion to dispose a battery pack 50 described later.

[0035] The lower housing 24 has a controller housing portion 25 (see FIGS. 4, 5, 7 to 9) for housing a controller 60 described later, and the controller housing portion 25 constitutes the upper portion of the rear portion of the lower housing 24. The controller housing portion 25 extends in the front-rear direction, and the upper wall of the lower housing 24 constitutes the upper wall 25U of the controller housing portion 25. And the front space of the controller housing portion 25 in the lower housing 24 is a communication path 24B (see FIGS. 7 and 9) as a communication space. The controller housing portion 25 and the motor housing 22 are communicated by the communication portion 22B of the motor housing 22 and the communication path 24B. The communication path 24B extends vertically when viewed from the left-right direction, and the upper end portion of the communication path 24B is communicated with the front portion of the controller housing portion 25. Therefore, the communication path 24B and the controller housing portion 25 are combined to form an L-shaped space.

[0036] As shown in FIGS. 8 and 9, the upper space of the controller housing portion 25 is a wire processing space 25A for routing wirings 90 to 94 described later. In the lower housing 24, a guide wall 24C for guiding the cooling air CW2 described later is formed. The guide wall 24C is formed in a plate shape with the front-rear direction as the plate thickness direction, and extends downward from the left part of the upper wall 25U in the controller housing portion 25 on the front side of the controller housing portion 25. Thereby, the space between the left part of the controller housing portion 25 and the communication passage 24B is partitioned front and rear by the guide wall 24C. A notch portion 24D is formed in the right part at the lower end of the guide wall 24C, and due to the notch portion 24D, the right part at the lower end of the guide wall 24C is disposed at a position one step higher than the left part at the lower end of the guide wall 24C. Thereby, the left part of the controller housing portion 25 is opened to the communication passage 24B side (front side) by the notch portion 24D. The guide wall 24C overlaps with the switching element 70A in the left-right direction in position. For this reason, the guiding of the cooling air CW2 by the guide wall 24C is mainly performed in the range where the switching element 70A exists in the left-right direction.

[0037] As shown in FIG. 8, an inclined wall 25B is formed at the upper part of the left wall of the controller housing portion 25. The inclined wall 25B is inclined to the right as it goes upward when viewed from the front-rear direction. On the inner peripheral surface of the inclined wall 25B, a thick portion 25C protruding to the right side (inside the controller housing portion 25) is formed, and the thick portion 25C extends in the front-rear direction. The lower end surface of the thick portion 25C is formed along a surface orthogonal to the vertical direction. In the thick portion 25C, controller-side vent holes 25D (see FIGS. 2, 3, 7, and 8), which are a pair of front-rear vent holes, are formed to penetrate in the left-right direction. Thereby, the inside and the outside of the controller housing portion 25 are communicated by the controller-side vent holes 25D. The controller-side vent holes 25D are formed in a long hole shape with the front-rear direction as the longitudinal direction, and are formed in a substantially crank shape in a cross-sectional view when viewed from the longitudinal direction. Specifically, the controller-side vent holes 25D include an outer vent hole portion 25D1 that constitutes the upper part of the controller-side vent holes 25D and is opened to the left side (the outside of the controller housing portion 25), and an inner vent hole portion 25D2 that constitutes the lower part of the controller-side vent holes 25D and is opened to the right side (the inside of the controller housing portion 25). And the right end portion of the outer vent hole portion 25D1 and the left end portion of the inner vent hole portion 25D2 communicate vertically. Thereby, a vent hole wall portion 25E that constitutes the lower wall of the controller-side vent holes 25D is formed in the thick portion 25C, and the vent hole wall portion 25E protrudes to the right from the inclined wall 25B.

[0038] As shown in FIGS. 2 and 7 to 10, the lower housing 24 has a battery mounting portion 26 for mounting a battery pack 50 described later, and the battery mounting portion 26 is disposed below the controller housing portion 25. That is, the lower wall 25L of the controller housing portion 25 partitions the controller housing portion 25 and the battery mounting portion 26. The battery mounting portion 26 is formed in a concave shape that is open to the lower side and the rear side, and a pair of left and right rail portions 26A (see FIG. 8) are formed on the inner peripheral portion of the battery mounting portion 26.

[0039] At the front of the battery mounting portion 26, a terminal holder 27 is provided, and a terminal 28 is embedded in the terminal holder 27. The terminal 28 has a terminal portion 28A. The terminal portion 28A protrudes forward from the terminal holder 27 and is disposed in the communication passage 24B and is located in front of the controller housing portion 25 (see FIG. 9). Further, at the front portion of the lower wall 25L of the controller housing portion 25, an air guiding recess 25F (see FIGS. 9 and 10) is formed to penetrate vertically in the middle portion in the left-right direction. The air guiding recess 25F is formed in a concave shape that is open to the front when viewed from below. By the air guiding recess 25F, the middle portion in the left-right direction of the terminal holder 27 is exposed upward. And when the cooling air CW2 described later flows from the controller side vent 25D to the lower wall 25L of the controller housing portion 25, the cooling air CW2 is configured to flow through the air guiding recess 25F and flow toward the terminal portion 28A side (front side). The rear end portion of the terminal 28 protrudes rearward from the terminal holder 27 and is disposed in the battery mounting portion 26. Note that the controller housing portion 25 is disposed above the communication portion 22B of the motor housing 22 described above, and the terminal portion 28A is located above the lower portion of the communication portion 22B (see FIG. 7).

[0040] As shown in FIGS. 1 to 6, the handle 29 is provided above the lower housing 24. The handle 29 is formed in a substantially reverse J-shaped cylindrical shape that is open obliquely rearward downward when viewed from the left side. The front end portion of the handle 29 is connected to the front end portion of the cover portion 24A, and the rear end portion of the handle 29 is connected to the rear end portion of the controller housing portion 25. Thereby, the main body housing 23 has a loop structure formed by the lower housing 24 and the handle 29.

[0041] The rear end portion of the handle 29 is a rear connection portion 29A. The rear connection portion 29A extends upward from the rear end portion of the upper wall 25U of the controller housing portion 25, and the rear connection portion 29A communicates with the rear end portion of the controller housing portion 25 (the wire processing space 25A). That is, an L-shaped space is formed by the controller housing portion 25 and the wire processing space 25A. The handle 29 has a grip portion 29B that is gripped by an operator, and the grip portion 29B extends along a direction that slopes downward as it goes toward the rear when viewed from the left side. And the lower end portion of the grip portion 29B is connected to the upper end portion of the rear connection portion 29A. A trigger 30 is provided at the upper end portion of the grip portion 29B, and the trigger 30 projects downward from the handle 29 so as to be pullable. As shown in FIG. 4, a trigger switch 32 is provided inside the upper end portion of the grip portion 29B. The trigger switch 32 is electrically connected to a controller 60 described later. And when the trigger 30 is pulled, the trigger switch 32 is pressed by the trigger 30 and outputs an on signal to the controller 60.

[0042] A rear shielding wall 29C is formed on the rear connection portion 29A, and the rear connection portion 29A is partitioned vertically by the rear shielding wall 29C. Further, a plurality (three locations in the present embodiment) of wiring grooves 29D for routing wirings 90 and 91 described later are formed in the rear shielding wall 29C. A front shielding wall 29E is formed inside the front end portion of the handle 29, and the front shielding wall 29E shields the space between the front end portion of the handle 29 and the cover portion 24A. Since the handle 29 has a structure in which air easily flows in from the outside for the convenience of arranging movable parts (such as the trigger switch 32), the front shielding wall 29E and the rear shielding wall 29C have the effect of suppressing a decrease in the amount of cooling air for the motor 41 and the controller 60 by sucking the air inside the handle 29 (especially the space where the trigger switch 32 is arranged) by the fan 44.

[0043] (Regarding the drive mechanism 40) As shown in FIG. 6, the drive mechanism 40 includes a motor 41 and an output shaft 45. The motor 41 is a brushless motor, which is housed in the motor housing 22 and electrically connected to the controller 60. The motor 41 includes a rotating shaft 41A having the left - right direction as the axial direction, a rotor 41B rotatably provided integrally with the rotating shaft 41A, and a stator 41C formed in a cylindrical shape and disposed on the radially outer side of the rotor 41B. The left end portion of the rotating shaft 41A is rotatably supported by a first motor bearing 42 fixed to the motor housing 22, and the right - hand portion of the rotating shaft 41A is rotatably supported by a second motor bearing 43 fixed to the soca bar 21. The right end portion of the rotating shaft 41A protrudes to the right from the second motor bearing 43, and a pinion gear is formed on the right end portion of the rotating shaft 41A. The motor 41 has a sensor substrate 41D, and the sensor substrate 41D is disposed on the left side of the rotor 41B and on the radially outer side of the rotating shaft 41A. The motor housing 22 is formed with a first wiring guide rib 22C for guiding a wiring 92 described later and a second wiring guide rib 22D for guiding a wiring 93. The first wiring guide rib 22C and the second wiring guide rib 22D are different in vertical position. Both the wiring 92 and the wiring 93 are connected to the sensor substrate 41D. Since the sensor substrate 41D extends to the position of the first wiring guide rib 22C (and the second wiring guide rib 22D), wiring can be easily performed. Also, since the positions of the first wiring guide rib 22C and the second wiring guide rib 22D are offset in the vertical direction, the two wirings do not overlap, and thus assembly is facilitated.

[0044] On the rotation shaft 41A, a fan 44 is provided on the right side of the rotor 41B. And the left and right positions of the communication part 22B of the motor housing 22 described above are set so that the communication part 22B is positioned between the rotor 41B and the fan 44 in the left - right direction (see Fig. 10). The fan 44 is a centrifugal fan and is configured to let the air flowing in from the front side flow out to the radially outer side of the fan 44. Thereby, the cooling air CW1 (see Fig. 10) flowing into the motor housing 22 from the motor - side vent 22A of the motor housing 22 is generated, and the cooling air CW1 flows to the right side in the motor housing 22 to cool the motor 41. Also, the cooling air CW2 (see Figs. 7 - 10) flowing into the controller housing part 25 from the controller - side vent 25D of the controller housing part 25 is generated, and the cooling air CW2 flows from the controller housing part 25 to the communication path 24B to cool the controller 60 described later. Further, the cooling air CW2 flowing in the communication path 24B passes through the communication part 22B and flows into the motor housing 22.

[0045] The output shaft 45 has the left - right direction as the axial direction, is arranged below the right end of the rotation shaft 41A, and is rotatably supported by the cover cylinder part 21A of the socket cover 21. A gear train 46 is provided between the output shaft 45 and the pinion gear of the rotation shaft 41A. The gears constituting the gear train 46 are integrally and rotatably fixed to the left end of the output shaft 45, and the other gears constituting the gear train 46 are meshed with the pinion gear of the rotation shaft 41A. And the center part of the circular saw blade 14 is fixed to the right end of the output shaft 45. Thereby, when the motor 41 is driven, the output shaft 45 and the circular saw blade 14 rotate around the axis of the output shaft 45.

[0046] (Battery pack 50) As shown in FIGS. 2, 7, and 8, the battery pack 50 is formed in a substantially rectangular block shape with the vertical direction as the thickness direction. At the upper end of the battery pack 50, a pair of left and right rail portions 50A are formed. Then, the upper end of the battery pack 50 is attached to the battery mounting portion 26 from the rear side, and the rail portion 50A of the battery pack 50 and the rail portion 26A of the battery mounting portion 26 are engaged vertically. Thereby, the battery pack 50 is attached to the lower housing 24 below the controller housing portion 25 and above the base 12.

[0047] Latches 51 are respectively provided on the left and right side portions of the battery pack 50. The latch 51 is configured to be pressable inward in the left-right direction. When the battery pack 50 is attached to the battery mounting portion 26, the latch 51 engages with the battery mounting portion 26 to maintain the attached state of the battery pack 50. On the other hand, by pressing the latch 51 to release the engaged state between the latch 51 and the battery mounting portion 26, the battery pack 50 can be removed from the battery mounting portion 26.

[0048] Inside the battery pack 50, three battery cells 52 are accommodated. The battery cell 52 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction and is arranged side by side in the left-right direction. And the nominal voltage of the battery pack 50 is set to 13 V or less. Also, in the vertical direction, the entire battery cell 52 is located below the axis AL (see FIG. 7) of the rotation shaft 41A of the motor 41 and above the base 12, and the vertical position of the battery pack 50 is set.

[0049] (Regarding the controller 60) As shown in FIGS. 4, 5, and 7 to 9, the controller 60 has a case 61 and a control board 62. The control board 62 is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction and the front-rear direction as the longitudinal direction. The case 61 is made of metal and is formed in a relatively shallow box shape that is open upward. That is, the case 61 has a bottom wall 61A and a peripheral wall 61B extending upward from the outer peripheral portion of the bottom wall 61A. And the control board 62 is housed in the case 61 and held by the case 61. The case 61 is filled with a potting material (not shown), and the upper surface of the control board 62 is covered by the potting material. The potting material is composed of a resin material such as urethane or epoxy. By filling the liquid potting material into the case 61 and curing the potting material, the upper surface of the control board 62 is covered by the potting material.

[0050] The controller 60 is housed in the lower part of the controller housing portion 25 and held by the lower housing 24. That is, the controller 60 is disposed below the wire processing space 25A. Specifically, the controller 60 is disposed such that the rear end portion of the controller 60 is sandwiched from both the upper and lower sides by the rear connection portion 29A of the handle 29 and the battery pack 50.

[0051] Heat generating components such as FETs are mounted on the upper surface of the control board 62, and the heat generating components are covered by the potting material. Control components 63 (see FIGS. 4 and 5) such as relatively tall capacitors are mounted on the upper surface of the rear end portion of the control board 62. The control component 63 protrudes upward from the opening of the case 61, and the upper end portion of the control component 63 is disposed within the rear connection portion 29A of the handle 29. That is, the upper end portion of the control component 63 protrudes above the inner peripheral surface of the upper wall 25U of the controller housing portion 25 (lower housing 24).

[0052] As shown in FIG. 8, in the state where the controller 60 is housed in the controller housing portion 25 of the controller 60, the left end portion of the controller 60 is disposed at a distance below the ventilation port wall portion 25E of the controller housing portion 25. Specifically, the ventilation port wall portion 25E protrudes to the right from the inclined wall 25B at a position spaced above the left peripheral wall 61B in the case 61, and the tip end portion (right end portion) of the ventilation port wall portion 25E is located on the right side of the left peripheral wall 61B in the case 61. That is, the right opening (the inner opening on the controller housing portion 25 side) of the controller side ventilation port 25D is located on the right side of the left peripheral wall 61B in the case 61. Thereby, the cooling air CW2 flowing into the controller housing portion 25 from the controller side ventilation port 25D mainly flows downward along the outer peripheral surface of the left peripheral wall 61B in the case 61, passes between the case 61 and the left wall of the controller housing portion 25, and cools the case 61 (controller 60). Further, in the state where the controller 60 is housed in the controller housing portion 25 of the controller 60, the length in the left-right direction of the controller side ventilation port 25D and the like are set so that the controller 60 cannot be visually recognized from the left opening (outer opening) of the controller side ventilation port 25D.

[0053] As shown in FIGS. 7 to 9, a plurality of guide ribs 61C are formed on the lower surface of the case 61. The guide ribs 61C are formed in a rib shape that extends intermittently in the left-right direction, and a plurality of guide ribs 61C are arranged at equal intervals in the front-rear direction. That is, a plurality (three locations in this embodiment) of notches are formed in the guide ribs 61C. Note that three notches are shown in FIG. 8. The guide ribs 61C are arranged close to the upper side of the lower wall 25L of the controller housing portion 25. When the cooling air CW2 that has flowed downward along the left side surface of the case 61 reaches the lower surface of the case 61, the cooling air CW2 flows to the right side of the lower surface of the case 61 by the guide ribs 61C to cool the case 61 (see FIG. 8). Further, the cooling air CW2 that has flowed into the space between the guide ribs 61C and the lower wall 25L of the controller housing portion 25 flows forward from the notches of the guide ribs 61C and flows into the communication passage 24B (see FIG. 9). As shown in FIG. 8, the cooling air CW2 mainly cools the left side of the controller 60 where the switching element 70A to be described later is arranged, and flows through the notches into the communication passage 24B. In FIG. 8, the position of the communication portion 22B is indicated by a broken line.

[0054] Next, the electrical configuration of the circular saw 10 will be described with reference to the functional (circuit) block diagram of FIG. 11.

[0055] An inverter unit 70 and a control unit 72 are mounted on a control board 62 of a controller 60. The control unit 72 has an arithmetic unit 74, and the arithmetic unit 74 is a microcomputer. The arithmetic unit 74 performs various controls such as drive control of the inverter unit 70. The inverter unit 70 is a circuit in which switching elements 70A (here, six) are bridge-connected. The arithmetic unit 74 outputs an instruction signal for controlling a drive signal output to each gate of the switching element 70A to a control signal output circuit 88. The switching element 70A performs a switching operation based on a drive signal input from the control signal output circuit 88, and supplies the DC voltage supplied from the battery pack 50 to the motor 41 as a three-phase (U-phase, V-phase, W-phase) voltage. The detection resistor 76 is provided in the path of the drive current of the motor 41. The control circuit voltage supply circuit 78 converts the voltage of the battery pack 50 into a voltage suitable for the operation of the control unit 72 and supplies it to the control unit 72. The switching element 70A serving as a heating element is located on the left side of the controller 60 (control board 62) and is preferably cooled by the cooling air from the left side.

[0056] In the control unit 72, a motor current detection circuit 80 detects the drive current of the motor 41 based on the terminal voltage of the detection resistor 76. A switch operation detection circuit 82 detects an operation on the trigger 30 based on an output signal from the trigger switch 32. A rotor position detection circuit 84 detects the rotational position of the motor 41 based on a signal from a sensor such as a hall element provided in the motor 41. A motor rotation speed detection circuit 86 detects the rotation speed of the motor 41 based on a signal from the rotor position detection circuit 84. The arithmetic unit 74 calculates the rotation speed of the motor 41 based on the detection result of the rotor position detection circuit 84.

[0057] Next, with reference to FIGS. 4 and 5, the wiring arranged in the main body housing 23 will be described. Inside the main body housing 23, the trigger switch 32 and the battery pack 50 are connected by a wiring 90. The wiring 90 is connected to a terminal portion 28A (not shown in FIGS. 4 and 5) of the terminal 28, extends upward from the terminal portion 28A, and is arranged in front of the controller 60. Further, the wiring 90 is bent rearward in front of the controller 60 and is arranged along the front-rear direction within the wire processing space 25A of the controller housing portion 25. Furthermore, the wiring 90 is bent upward above the rear end portion of the controller 60, is arranged within the rear connection portion 29A and the gripping portion 29B of the handle 29, and is connected to the trigger switch 32. Note that in the rear connection portion 29A, the wiring 90 is arranged within the wiring groove 29D.

[0058] Also, the trigger switch 32 and the control board 62 (inverter unit 70) are connected by a wiring 91. The wiring 91 extends upward from the rear end portion of the control board 62, passes through the wire processing space 25A, and is arranged in the rear connection portion 29A and the gripping portion 29B of the handle 29. And the wiring 91 is connected to the trigger switch 32. Note that in the rear connection portion 29A, the wiring 91 is arranged within the wiring groove 29D.

[0059] Also, three wirings 92 supply the DC voltage supplied from the battery pack 50 to the motor 41 as a three-phase (U-phase, V-phase, W-phase) voltage. The wirings 92 extend from the upper surface of the control board 62, are bent forward within the wire processing space 25A, and are arranged along the front-rear direction within the wire processing space 25A. Further, the wirings 92 extend forward from the wire processing space 25A and are arranged above the right end portion of the motor housing 22. Furthermore, the wirings 92 are bent leftward above the motor housing 22, are arranged from the middle portion in the left-right direction of the motor housing 22 to the inside of the upper portion of the motor housing 22, and are connected to the sensor board 41D of the motor 41.

[0060] Further, the motor 41 and the controller 60 are connected by a wiring 93 which is a plurality of signal lines. Similar to the wiring 92, the wiring 93 extends from the upper surface of the control board 62, bends forward in the wire processing space 25A, and is arranged along the front-rear direction in the wire processing space 25A. Further, the wiring 93 extends forward from the wire processing space 25A and is disposed above the right end portion of the motor housing 22. Furthermore, the wiring 93 bends to the left above the motor housing 22, is arranged from the intermediate portion in the left-right direction of the motor housing 22 into the upper portion of the motor housing 22, and is connected to the sensor board 41D of the motor 41.

[0061] Also, the battery pack 50 and the controller 60 (control circuit voltage supply circuit 78) are connected by a wiring 94. The wiring 94 is connected to the terminal portion 28A of the terminal 28, extends upward from the terminal portion 28A, and is arranged in front of the controller 60. Further, the wiring 94 bends rearward in front of the controller 60 and is arranged along the front-rear direction in the wire processing space 25A of the controller housing portion 25. Then, the wiring 94 is connected to the upper surface of the control board 62.

[0062] Next, with reference to FIGS. 1 to 3, the position of the center of gravity G of the circular saw 10 will be described. The center of gravity G of the circular saw 10 is located at a position below the handle 29 and overlapping the motor housing 22 when viewed from the front side. Also, the center of gravity G is located at a position below the axis AL of the motor 41 and overlapping the motor 41 when viewed from the left-right direction. Further, the center of gravity G is located at a position overlapping the front end side portion of the gripping portion 29B of the handle 29 when viewed from the upper side.

[0063] (Function and Effect) Next, the operation and effects of the present embodiment will be described.

[0064] During the cutting process of the circular saw 10 configured as described above, the base 12 is placed on the workpiece, and the operator operates the trigger 30. As a result, an on-signal is output from the trigger switch 32 to the controller 60, and the motor 41 is driven by the controller 60. Therefore, the driving force of the motor 41 is transmitted to the output shaft 45 by the drive mechanism 40, and the output shaft 45 rotates together with the circular saw blade 14. Then, by moving the circular saw 10 forward with respect to the workpiece, the cutting process for the workpiece is performed.

[0065] Also, when the motor 41 is driven, the fan 44 rotates together with the rotating shaft 41A of the motor 41, and cooling air is generated inside the motor housing 22. Specifically, the cooling air CW1 flows into the motor housing 22 from the motor-side vent 22A of the motor housing 22 and flows to the right inside the motor housing 22. Thereby, the motor 41 is cooled by the cooling air CW1.

[0066] Also, the cooling air CW2 flows into the controller housing portion 25 from the controller-side vent 25D of the controller housing portion 25. The cooling air CW2 that has flowed into the controller housing portion 25 mainly flows downward along the left side surface of the case 61 between the left wall of the controller housing portion 25 and the case 61 of the controller 60. Thereby, the left side surface of the controller 60 is cooled by the cooling air CW2. Also, the cooling air CW2 that has reached the bottom wall 61A of the case 61 is guided by the guide rib 61C and flows to the right between the bottom wall 61A and the lower wall 25L of the controller housing portion 25. Thereby, the lower surface of the controller 60 is cooled by the cooling air CW2. Also, the cooling air CW2 flowing between the bottom wall 61A and the lower wall 25L of the controller housing portion 25 flows forward from the notch of the guide rib 61C and flows into the communication passage 24B. At this time, the cooling air CW2 flowing from the air guiding recess 25F of the lower wall 25L hits the terminal portion 28A of the terminal 28, and the terminal 28 is cooled by the cooling air CW2. The cooling air CW2 that has flowed into the communication passage 24B passes through the communication passage 24B and the communication portion 22B and flows into the motor housing 22.

[0067] Here, the main body housing 23 (housing 20) includes a handle 29 extending in the front-rear direction, a battery mounting portion 26 provided on the rear side of the motor 41 and below the handle 29, and a controller housing portion 25 provided above the battery mounting portion 26. A battery pack 50 is mounted on the battery mounting portion 26, and the battery pack 50 is disposed above the base 12. Further, a controller 60 is housed in the controller housing portion 25, and the rear end portion of the controller 60 is sandwiched in the vertical direction by the battery pack 50 and the rear end portion of the handle 29 (rear connection portion 29A). Thereby, the rear connection portion 29A of the handle 29 located above the controller 60 can be utilized as an arrangement space for arranging a part of the controller 60. That is, the upper end portion of a relatively tall control component 63 mounted on the controller 60 can be arranged within the rear connection portion 29A of the handle 29. Therefore, an effective arrangement of the controller 60 can be realized.

[0068] Further, in the controller 60, by arranging the upper end portion of the control component 63 at the rear connection portion 29A of the handle 29, it is possible to suppress the increase in the size of the circular saw 10 in the vertical direction. That is, if the entire controller 60 is arranged in front of the rear connection portion 29A, in order to avoid interference between the control component 63 and the upper wall 25U of the controller housing portion 25, it is necessary to arrange the controller 60 lower than in the present embodiment. In this case, the battery mounting portion 26 and the battery pack 50 are also arranged lower than in the present embodiment. For this reason, there is a possibility that the size of the circular saw 10 increases in the vertical direction. On the other hand, in the present embodiment, as described above, the upper end portion of the control component 63 can be arranged in the rear connection portion 29A of the handle 29. As a result, while avoiding interference between the control component 63 and the upper wall 25U of the controller housing portion 25, it is possible to suppress the increase in the size of the circular saw 10 in the vertical direction. As described above, in the present embodiment, an L-shaped accommodation space is formed by the communication path 24B and the controller housing portion 25, and an L-shaped accommodation space is also formed by the controller housing portion 25 and the rear connection portion 29A, and the L-shaped controller having the control component 63 is accommodated in the latter accommodation space, but it may be accommodated in the former.

[0069] Further, the upper portion of the controller housing portion 25 is configured as a wire processing space 25A, and the controller 60 is accommodated in the lower portion of the controller housing portion 25. Thereby, in the wire processing space 25A, wire processing of wirings 92, 93, etc. extending upward from the control board 62 can be performed well. Therefore, the workability when accommodating the controller 60 in the controller housing portion 25 can be improved.

[0070] Further, the battery mounting portion 26 is provided with a terminal holder 27 that holds a terminal 28 connected to the battery pack 50, and the communication path 24B is located in front of the terminal holder 27. Thereby, for example, the communication path 24B can be utilized as a work space when wire processing the wirings 90, 94 extending from the terminal portion 28A of the terminal 28. Therefore, the workability during wire processing can be improved.

[0071] Also, the terminal portion 28A of the terminal 28 is located on the front side of the controller 60, and the wirings 90 and 94 extend upward from the terminal portion 28A and are routed in front of the controller. Thereby, while saving space in the arrangement area for the wirings 90 and 94, the wirings 90 and 94 can be routed toward the wire processing space 25A side.

[0072] Also, the handle 29 is provided with a trigger switch 32, and the wiring 91 extending upward from the rear end portion of the controller 60 passes through the rear connection portion 29A of the handle 29 and is routed to the grip portion 29B and connected to the trigger switch 32. Thereby, the wiring 91 extending from the control board 62 can be directly routed to the rear connection portion 29A and connected to the trigger switch 32 without detouring. As a result, the wire length of the wiring 91 can be shortened and it can contribute to reducing the man-hours for wire processing when processing the wiring 91.

[0073] Also, a battery cell 52 is housed inside the battery pack 50, and the battery cell 52 is formed in a columnar shape with the front-rear direction as the axial direction. And in the vertical direction, the entire battery cell 52 is located between the axis AL of the rotation axis 41A of the motor 41 and the base 12. Thereby, while saving space in the arrangement area of the battery pack 50 in the vertical direction, the compactification of the entire circular saw 10 can be realized.

[0074] In addition, a fan 44 is provided on the front side of the controller 60. A controller-side vent 25D that communicates the inside and outside of the controller housing 25 is formed in the left wall of the controller housing 25. Then, the cooling air CW2 generated by the fan 44 flows into the controller housing 25 from the controller-side vent 25D. Thereby, the controller 60 can be cooled by the cooling air CW2 that has flowed into the controller housing 25. Moreover, the controller-side vent 25D is disposed above the case 61 of the controller 60. Thus, if static electricity generated during the cutting process of the circular saw 10 enters the controller housing 25 from the controller-side vent 25D, the static electricity passes through the right opening of the controller-side vent 25D. For this reason, if the controller-side vent 25D and the case 61 are arranged at the same position in the vertical direction and the opening of the controller-side vent 25D and the peripheral wall 61B of the case 61 are arranged to face each other in the left-right direction, static electricity is likely to be applied to the metal case 61. For this reason, in such a case, the control operation of the controller 60 may be affected by static electricity. On the other hand, in the present embodiment, since the controller-side vent 25D is disposed above the case 61 of the controller 60, static electricity is less likely to be applied to the case 61 compared to the above case. Thereby, the influence on the controller 60 due to static electricity can be suppressed. Therefore, an effective arrangement of the controller 60 in the controller housing 25 can be realized. In other words, an effective arrangement relationship between the controller 60 and the controller-side vent 25D can be realized.

[0075] Further, the main body housing 23 has a motor housing 22 that houses the motor 41 and the fan 44, and a communication passage 24B that communicates with the controller housing portion 25 on the front side of the controller housing portion 25. A communication portion 22B that communicates the communication passage 24B with the inside of the motor housing 22 is formed in the motor housing 22, and the communication portion 22B is located below the controller housing portion 25. As a result, the cooling air CW2 flowing into the controller housing portion 25 from the controller side vent 25D mainly flows downward in the controller housing portion 25. For this reason, even if the controller side vent 25D is arranged above the controller 60, the controller 60 located below the controller side vent 25D can be effectively cooled.

[0076] Also, the terminal 28 provided in the battery mounting portion 26 has a terminal portion 28A that protrudes forward from the terminal holder 27, and the terminal portion 28A is located in the communication passage 24B. Specifically, the terminal portion 28A is located in front of the controller 60. As a result, the cooling air CW2 that has flowed from the controller side vent 25D to the lower wall of the controller housing portion 25 flows obliquely downward to the front from the air guiding recess 25F of the lower wall 25L of the controller housing portion 25 and flows into the communication passage 24B. At this time, the cooling air CW2 flowing into the communication passage 24B hits the terminal portion 28A of the terminal 28. For this reason, the terminal 28 can also be cooled by the cooling air CW2. In particular, in the present embodiment, the nominal voltage of the battery pack 50 is 13V or less. That is, the nominal voltage of the battery pack 50 is set to a relatively low voltage. Thereby, the terminal portion 28A of the terminal 28 that is likely to generate heat in the battery pack 50 can be effectively cooled.

[0077] In addition, a guide wall 24C is provided on the front side of the left part of the controller 60. The guide wall 24C extends downward from the upper wall 25U of the controller housing part 25 with the front-rear direction as the plate thickness direction. As a result, the communication location between the controller housing part 25 and the communication passage 24B can be offset downward, making it easier for the cooling air CW2 flowing into the controller housing part 25 from the controller-side vent 25D to pass below the controller 60. When the cooling air CW2 flows forward, the guide wall 24C can change the flow of the cooling air CW2 to a downward flow and guide the cooling air CW2 downward. Thereby, the front end part of the case 61 can be cooled by the cooling air CW2 flowing along the guide wall 24C.

[0078] In addition, the vent wall part 25E constituting the lower wall of the controller-side vent 25D protrudes to the right from the inclined wall 25B of the controller housing part 25 and is disposed above the upper side of the left peripheral wall 61B of the case 61. Further, the tip part (right end part) of the vent wall part 25E is located on the right side of the left peripheral wall 61B of the case 61. That is, the right opening of the controller-side vent 25D is located on the right side of the left peripheral wall 61B of the case 61. Thereby, it is possible to more effectively suppress the electrostatic charge that enters the controller housing part 25 from the right opening of the controller-side vent 25D from being applied to the peripheral wall 61B of the case 61.

Explanation of Reference Numerals

[0079] 10 Circular saw (working machine) 12 Base 14 Circular saw blade (tip tool) 20 Housing 22 Motor housing 22B Communication part 24B Communication passage (communication space) 24C Guide wall 25 Controller housing part 25D Controller-side vent (vent) 25U Upper wall of the controller housing part 26 Battery mounting part 27 Terminal holder 28 Terminal 28A Terminal part 29 Handle 29A Rear connection part 30 Trigger 32 Trigger switch 41 Motor 41A Rotating shaft 41B Rotor 44 Fan 50 Battery pack (battery) 52 Battery cell 60 Controller 61 Case 61B Peripheral wall 62 Control board 63 Control components 90 Wiring 91 Wiring 92 Wiring 93 Wiring 94 Wiring AL Axis of the rotating shaft CW1 Cooling air CW2 Cooling air

Claims

1. A base that slides forward on a workpiece during processing, a housing provided above the base, a motor having a rotor that rotates with the left - right direction as the axial direction and is housed in the housing, a controller that controls the motor, an output shaft to which a tip tool is attached and is driven by the motor, a battery that supplies power to the motor, and comprising: The housing has a handle extending in the front - rear direction, a battery mounting portion provided below the handle and behind the motor, where the battery is mounted, a controller housing portion provided above the battery mounting portion and housing the controller, and is configured to include: A working machine in which at least a part of the controller is sandwiched in the vertical direction by the battery and the rear end portion of the handle.

2. The controller includes a concave case that is open upward, and a control board housed in the case, and is configured to include: The working machine according to claim 1, wherein wiring extending from the control board is arranged in the front - rear direction above the case.

3. The housing has a communication space extending in the vertical direction in front of the controller housing portion, the controller housing portion extends in the front - rear direction, the rear end portion of the handle is communicated with the upper rear end portion of the controller housing portion, and the communication space is communicated with the upper front end portion of the controller housing portion, The working machine according to claim 1, wherein the controller is arranged in the lower part of the controller housing portion.

4. The controller includes a concave case that is open upward, and a control board housed in the case and having control components mounted thereon that protrude upward from the case, and is configured to include: The working machine according to claim 1, wherein the upper end portion of the control component is located within the rear end portion of the handle.

5. The battery mounting portion is provided with a terminal holder that holds a terminal connected to the battery, The working machine according to claim 3, wherein the communication space is located in front of the terminal holder.

6. The terminal has a terminal portion to which wiring is connected, and the terminal portion is located in front of the controller, The working machine according to claim 5, wherein the wiring extends upward from the terminal portion and is arranged in front of the controller.

7. The handle is provided with a trigger and a trigger switch pressed by the trigger. The wiring extending upward from the rear end of the controller passes through the rear end of the handle and is routed inside the handle, and is connected to the trigger switch. The working machine according to claim 1.

8. Inside the battery, battery cells extending in a direction perpendicular to the axial direction of the motor are accommodated. The entire battery cell is located between the axis of the rotation axis of the motor and the base in the vertical direction. The working machine according to claim 1.

9. The controller has a metal case opened upward and a control board accommodated in the case. A fan that generates cooling air by rotating by driving the motor is provided on the front side of the controller. A vent that communicates the inside and outside of the controller housing is formed in the side wall of the controller housing. The vent is disposed above the case, and the cooling air passes through the vent. The working machine according to claim 1.

10. The housing A motor housing that houses the motor and the fan, A communication space communicated with the controller housing portion on the front side of the controller housing portion, is configured to include, A communication portion that communicates the communication space and the inside of the motor housing is formed in the motor housing, and the communication portion is located below the controller housing portion. The working machine according to claim 9.

11. The battery mounting portion is provided with a terminal connected to the battery and a terminal holder that holds the terminal. The terminal has a terminal portion that protrudes forward from the terminal holder, and the terminal portion is located in the communication space. The working machine according to claim 10.

12. The nominal voltage of the battery is 13 V or less. The working machine according to claim 11.

13. A guide wall is provided on the front side of the controller in the housing. The guide wall guides the flow of the cooling air along the vertical direction. The working machine according to claim 10.

14. The vent wall portion constituting the lower wall of the vent protrudes from the side wall of the controller housing portion to the inside of the controller housing portion and is disposed above the peripheral wall of the case. The working machine according to claim 9, wherein the tip of the ventilation port wall portion is located inside the controller housing portion more than the peripheral wall located below the ventilation port wall portion.

15. A base that slides forward on the workpiece during machining, A housing provided above the base, A motor having a rotor that rotates about an axis parallel to a plane extending in the front-rear, left-right directions and housed in the housing, A controller that controls the motor, An output shaft to which a tip tool is attached and driven by the motor, A battery that supplies power to the motor, Comprising: The housing includes: A handle located above the motor, A battery mounting portion provided behind the motor and below the handle, where the battery is mounted, A controller housing portion provided above the battery mounting portion and housing the controller, And is configured to include: The housing has a loop structure including the handle and the controller housing portion, The controller has control components protruding upward mounted thereon, The working machine, wherein at least a part of the control components is located above the inner peripheral surface of the upper wall of the controller housing portion.

Images