Work equipment

Abstract

To downsize an arrangement space in a controller.SOLUTION: In a grinder 10, a controller 50 comprises a controller substrate 51 and a controller case 52 housing the controller substrate 51. The controller case 52 is formed into a box-shape opened to one side in an orthogonal direction, and a through hole 52N is formed through on a bottom wall 52A of the controller 50. In the through hole 52N, wiring 60 extending from the controller substrate 51 and a first connector 56 and a second connector 57 mounted on the controller substrate 51 are arranged. Thus, wirings 58 to 60 for connecting a terminal unit 45 or an operation switch 82 and the controller substrate 51 can be pulled out from a bottom surface side of the controller case 52 and be connected to the electrical appliances. Thus, it is possible to downsize the arrangement space of the controller 50 including the wirings 58 to 60.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] In the disc grinder (working machine) described in Patent Document 1 below, a motor and a control board are housed inside a housing, and the motor is driven by the control of the control board. A battery pack for supplying power is electrically connected to the control board. Specifically, a terminal for connecting to the battery pack is provided on the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 098564 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned disc grinder, the control board is housed in a container-shaped board case, the motor is disposed on the opening side of the board case, and the battery pack is disposed on the opposite side of the opening side of the board case. Therefore, for example, the wiring connecting the control board and the terminals passes from the control board through the opening of the board case, is routed to the side of the board case, and is connected to the terminals. Therefore, in the above-mentioned disc grinder, space is required on the side of the board case to route the wiring, which poses a problem of increasing the space required to arrange the controller (control board and board case) including the wiring.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a work machine that can reduce the space required for arranging a controller. [Means for solving the problem]

[0006] One or more embodiments of the present invention include a drive unit that applies a drive force to a tool bit, a controller that controls the drive unit, and a housing that accommodates the drive unit and the controller, wherein the controller includes a controller board, a case that is formed in a box shape with a thickness direction of the controller board and that is open on one side in the thickness direction and that accommodates the controller board, and a first wiring and a second wiring connected to the controller board and extending from the inside to the outside of the case; and a terminal portion provided in the housing to which a battery for supplying power to the drive portion is connected. The drive unit is disposed on one side of the controller in a predetermined direction. be spaced apart At the same time, the terminal portion is on the other side of the controller in the predetermined direction. Spaced apart The controller board extends in a direction intersecting a predetermined direction, and the terminal portion and the controller , the above The controller and the drive unit are electrically connected by a first wiring. The aforementioned The battery is electrically connected to the driving unit through the first wiring and the second wiring, and power from the battery is supplied to the driving unit through the first wiring and the second wiring. At least one of the side wall and the bottom wall of the case is connected to the inside and outside of the case, and the first wiring Part of but Insertion a communication portion is formed through which the second wiring extends toward the drive portion from a portion of the case that is open on one side in the thickness direction.

[0007] In one or more embodiments of the present invention, a cover member that closes the communication part is provided between the controller board and the case, and the cover member has 1st wiring The work machine is formed with an insertion portion through which the

[0008] In one or more embodiments of the present invention, the cover member is made of an elastic material, and the outer periphery of the cover member is clamped between the controller board and the case and compressed and deformed.

[0009] In one or more embodiments of the present invention, the drive unit is On one side of the predetermined direction Located in front Recording endThe slave unit is the controller with respect to the predetermined direction The communication portion is formed on the bottom wall of the case, and the 1st wiring The terminal portion and the controller board are connected by the

[0010] One or more embodiments of the present invention are directed to a work machine in which a heat dissipation portion that protrudes in the thickness direction of the controller is formed on the bottom wall of the case.

[0011] One or more embodiments of the present invention are a work machine in which directions perpendicular to each other when viewed from the thickness direction of the case are defined as a first direction and a second direction, the housing has an air intake port positioned outside the case in the first direction, and the communication portion is formed at the end of the case in the second direction. One or more embodiments of the present invention provide a tool holder including: a drive unit that applies a driving force to a tool accessory; a controller that controls the drive unit; and a housing that accommodates the drive unit and the controller. of the controller includes a controller board, a case formed in a box shape with a thickness direction of the controller board and open on one side in the thickness direction, and accommodating the controller board; a communication section formed on at least one of a side wall and a bottom wall of the case, which communicates the inside and outside of the case, and in which a connection member connected to the controller board is disposed; of a cover member that closes the communication portion is provided between the controller board and the case, and an insertion portion through which the connecting member is inserted is formed in the cover member, the cover member is made of an elastic material, and an outer periphery of the cover member is sandwiched between the controller board and the case and is compressed and deformed. is. One or more embodiments of the present invention are a work machine in which a cover member is provided between the controller board and the case, and in the case, the space from which the first wiring extends from the controller board and the space that houses the controller board are blocked by the cover member. One or more embodiments of the present invention are a work machine in which a raised portion is provided on the bottom inner surface of the case, the controller board and the raised portion are connected in a heat-transferable manner, the controller board and the bottom inner surface of the case are spaced apart in the thickness direction at a location different from the raised portion, and the cover member is disposed between the spaced apart controller board and the bottom inner surface of the case. One or more embodiments of the present invention are a work machine in which the first wiring extends through the space between the separated case and the terminal portion to electrically connect the controller board and the terminal portion. One or more embodiments of the present invention are a work machine having a fan rotated by the drive unit, an air intake port provided in the housing between the terminal portion in the specified direction and the case, and air flowing in through the air intake port as the fan rotates to cool the case. In one or more embodiments of the present invention, the case has a heat dissipation section on the bottom wall located on the other side in the thickness direction, and the heat dissipation section is cooled by the air flowing in from the air intake port. One or more embodiments of the present invention are a work machine in which the controller board is provided with a connector portion to which at least one of the first wiring or a signal wiring for signal transmission connected to the controller can be connected, and the connector portion is exposed by the communication portion. [Effects of the Invention]

[0012] According to one or more embodiments of the present invention, it is possible to reduce the layout space of the controller. [Brief explanation of the drawings]

[0013] [Figure 1]1 is a side view of a disc grinder according to an embodiment of the present invention, viewed from the left side. [Figure 2] 2 is a side cross-sectional view showing the inside of the disc grinder shown in FIG. 1 as seen from the left side. [Figure 3] 3 is an enlarged side cross-sectional view showing the periphery of the controller shown in FIG. 2. FIG. [Figure 4] 4 is a view of the controller shown in FIG. 3 as seen from the other orthogonal direction side. [Figure 5] FIG. 3 is an exploded perspective view of the controller shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a disc grinder 10 (hereinafter simply referred to as grinder 10) as a work machine according to this embodiment will be described with reference to the drawings. Note that arrows UP, FR, and LH, which are appropriately shown in the drawings, respectively indicate the upper side, front side, and left side of the grinder 10. In the following description, when the up-down, front-rear, and left-right directions are used, they refer to the up-down, front-rear, and left-right directions of the grinder 10 unless otherwise specified.

[0015] 1 and 2, the grinder 10 is configured as a tool for performing grinding or the like on a workpiece. Below, the overall configuration of the grinder 10 will be described first, and then the controller 50 of the grinder 10 will be described.

[0016] (Overall configuration of Grinder 10) The grinder 10 is formed in a generally cylindrical shape extending in the front-to-rear direction as a whole, and the outer shell of the grinder 10 is formed by a housing 20. The housing 20 is composed of a motor housing 21 that forms the middle part of the housing 20 in the front-to-rear direction, a handle housing 22 that forms the rear part of the housing 20, and a gear housing 27 that forms the front end part of the housing 20.

[0017] (Regarding the motor housing 21) The motor housing 21 is made of resin and is formed in a generally cylindrical shape with a bottom that is open to the front. A motor 30 serving as a drive unit is housed within the motor housing 21. The motor 30 is configured as a brushless motor, is electrically connected to a controller 50 (described later), and is driven under the control of the controller 50. The motor 30 includes a rotating shaft 30A, a rotor 30B, and a stator 30C.

[0018] The rotating shaft 30A is disposed with its axial direction aligned with the front-rear direction, and its rear end is rotatably supported by a first motor bearing 31 held by the rear wall of the motor housing 21. The front end of the rotating shaft 30A is disposed within a gear housing 27 (described later), and a front end portion of the rotating shaft 30A is rotatably supported by a second motor bearing 32 held by the gear housing 27. A pinion gear 33 is fixed to the front end of the rotating shaft 30A. The rotor 30B is disposed radially outward of the rotating shaft 30A and is configured to rotate integrally with the rotating shaft 30A. The stator 30C is formed in a substantially cylindrical shape with its axial direction aligned with the front-rear direction, and is supported by the motor housing 21 radially outward of the rotor 30B.

[0019] A fan 34 is provided on the front end portion of the rotary shaft 30A so as to be rotatable integrally with the rotary shaft 30A, behind the second motor bearing 32. The fan 34 is configured as an axial flow fan, and is configured to generate an airflow that flows from the rear side to the front side.

[0020] A fan guide 35 is provided radially outward of the fan 34. The fan guide 35 is formed in a generally cylindrical shape with a bottom that is open to the front, and an insertion portion 35A is formed through the center of the bottom wall of the fan guide 35, through which the rotating shaft 30A of the motor 30 is inserted. The fan guide 35 is attached to the tip of the stator 30C of the motor 30, and is sandwiched in the front-rear direction between the motor 30 and a gear housing 27 (described later).

[0021] An expanded diameter portion 21A that extends radially outward is formed at the front end of the motor housing 21, and is formed in a generally rectangular shape when viewed from the front. A switch lever 40 (see FIG. 1) is provided on the left side of the motor housing 21. The switch lever 40 is connected to the motor housing 21 so as to be slidable in the front-rear direction. Specifically, the switch lever 40 is configured to be slidable between an OFF position shown in FIG. 1 and an ON position (not shown) that is slid forward from the OFF position.

[0022] A switch holder 21B is integrally formed on the rear wall of the motor housing 21. The switch holder 21B protrudes rearward from the motor housing 21 and has a generally rectangular box shape that is open to the right. The switch holder 21B holds a switch 41. The switch 41 is electrically connected to a controller 50 (described later). When the switch lever 40 is operated from the off position to the on position, the switch 41 is turned on and outputs an on signal to the controller 50. Specifically, a slide bar 42 is connected to the switch lever 40. When the switch lever 40 is slid, the slide bar 42 presses the switch 41. This turns on the switch 41, causing the motor 30 to be driven by the controller 50. The slide bar 42 extends in the front-to-rear direction within the housing 20. Only the rear end of the slide bar 42 is shown in FIG. 2.

[0023] (Regarding the handle housing 22) The handle housing 22 is composed of housing members 22L and 22R (see FIG. 4) that are divided into two in the left-right direction, and the housing members 22L and 22R are made of resin. The housing members 22L and 22R are fastened to each other while sandwiching the switch holding portion 21B from both left and right sides. This connects the handle housing 22 to the motor housing 21. The front portion of the handle housing 22 forms a handle portion 23 that is gripped by the operator, and the rear portion of the handle housing 22 forms a rear housing portion 24. The rear housing portion 24 protrudes in both the up-down direction and the left-right direction beyond the handle portion 23. In other words, the widthwise dimension (left-right dimension) of the rear housing portion 24 is set larger than the widthwise dimension of the handle portion 23.

[0024] When viewed from the left and right, the rear housing portion 24 extends in a direction that inclines rearward as it extends upward. In the following description, the extension direction of the rear housing portion 24 when viewed from the left and right is referred to as the inclination direction (see arrows S1 and S2 in FIGS. 1 and 2), and the direction perpendicular to the inclination direction is referred to as the orthogonal direction (see arrows V1 and V2 in FIGS. 1 and 2). Furthermore, the side in the direction of arrow S1 in FIGS. 1 and 2 is referred to as one side of the inclination direction, and the side in the direction of arrow V1 in FIGS. 1 and 2 is referred to as one side of the orthogonal direction.

[0025] A plurality of air intake ports 24A (see FIG. 1) are formed through the left and right side walls of the rear housing portion 24. The air intake ports 24A are formed as elongated holes with the inclination direction as the longitudinal direction. A pair of left and right filters 28 are detachably provided on the rear housing portion 24 at positions corresponding to the air intake ports 24A, and the filters 28 cover the air intake ports 24A from the outside in the left and right direction. This prevents foreign matter from entering the housing 20 through the air intake ports 24A. Furthermore, most of the outer periphery of the handle housing 22 is covered by a rubber portion 25 (see the gray-colored portion in FIG. 1) made of an elastic material such as rubber or elastomer, and the rubber portion 25 is formed integrally with the housing members 22L and 22R.

[0026] The rear housing portion 24 accommodates a controller 50. That is, the motor 30 and the switch 41 described above are disposed in front of the controller 50. The configuration of the controller 50 will be described later.

[0027] A battery mounting section 24B for mounting a battery 44 is provided at the rear end of the rear housing section 24 on the other orthogonal side of the controller 50. The battery mounting section 24B extends along the tilt direction. The battery mounting section 24B is formed in a concave shape that is open to one side in the tilt direction and the other side in the orthogonal direction. The battery mounting section 24B is provided with a terminal unit 45 as an electrical component and terminal portion connected to the battery 44. The terminal unit 45 is sandwiched between the housing members 22L and 22R from the outer lateral sides and assembled to the rear housing section 24. The terminal unit 45 is electrically connected to the controller 50. The battery 44 is detachably mounted in the battery mounting section 24B from one side in the tilt direction, and power from the battery 44 is supplied to the controller 50 via the terminal unit 45.

[0028] A speed setting unit 46 is provided at the upper end of the rear housing portion 24 on one side in the tilt direction of the controller 50. The speed setting unit 46 is configured as a mechanism for setting a target rotation speed of the motor 30. The speed setting unit 46 includes a rotary volume 47 and an operation dial 48. The operation dial 48 is formed in a disk shape with its thickness direction approximately in the tilt direction and is configured to be rotatable with its axial direction approximately in the tilt direction. A portion of the operation dial 48 is exposed from the rear housing portion 24 on one side in the perpendicular direction so as to be operable. The rotary volume 47 is configured as a rotary variable resistor and is electrically connected to the controller 50. The rotary volume 47 is also connected to the operation dial 48 and outputs an output signal to the controller 50 according to the rotation position of the operation dial 48, and the controller 50 sets the rotation speed of the rotary shaft 30A of the motor 30.

[0029] An operation unit 80 is provided at the lower end of the rear housing portion 24 on the other side in the tilt direction of the controller 50, and the operation unit 80 is configured as a mechanism for operating the illumination unit 77. The operation unit 80 is configured to include an operation button 81 and an operation switch 82. The operation button 81 is exposed from the outer periphery of the rear housing portion 24 so as to be operable by pressing it. The operation switch 82 is configured as a tactile switch or the like, and is electrically connected to the controller 50. When the operation button 81 is pressed to turn on the operation switch 82, an ON signal is output from the operation switch 82 to the controller 50.

[0030] (Regarding gear housing 27) The gear housing 27 is hollow and generally triangular when viewed from the left and right, and is open downward. A coupled portion 27A is formed at the rear end of the gear housing 27, and the coupled portion 27A is formed in a generally rectangular cylindrical shape corresponding to the expanded diameter portion 21A of the motor housing 21. The coupled portion 27A and the expanded diameter portion 21A are abutted against each other in the front-to-rear direction, and the outer periphery of the coupled portion 27A is fastened and fixed to the expanded diameter portion 21A. A packing gland 70 is provided on the lower side of the gear housing 27. The packing gland 70 is formed in a stepped cylindrical shape with its axial direction extending vertically, and is fixed to the gear housing 27.

[0031] A spindle 71 is provided within the gear housing 27 and is formed in a generally cylindrical shape with its axial direction extending vertically. The upper end of the spindle 71 is rotatably supported by a bearing 72 fixed to the gear housing 27, and the vertical middle portion of the spindle 71 is rotatably supported by a bearing 73 fixed to the packing gland 70. A bevel gear 74 is provided at the upper end of the spindle 71 so as to rotate integrally therewith, and the pinion gear 33 of the motor 30 is meshed with the bevel gear 74. This allows the driving force of the motor 30 to be transmitted to the spindle 71 via the bevel gear 74. A grinding wheel 75 serving as a tool is attached to the lower end of the spindle 71 and is formed in a generally circular plate shape with its thickness direction extending vertically. This causes the grinding wheel 75 to rotate together with the spindle 71 due to the driving force of the motor 30, thereby performing grinding or other processes on the workpiece. A wheel guard 76 is detachably fixed to the lower end of the packing gland 70, and the wheel guard 76 covers the rear of the grinding wheel 75 from above and behind.

[0032] Illumination units 77 are provided on both left and right sides of the gear housing 27. The illumination units 77 have light sources (not shown) such as LEDs, which are electrically connected to the controller 50. When the controller 50 causes the light source to emit light, the emitted light illuminates the front of the grinding wheel 75.

[0033] (Regarding the controller 50) As shown in FIGS. 2 to 5 , the controller 50 includes a controller board 51 and a controller case 52 that houses and holds the controller board 51. The controller case 52 is made of a metal such as aluminum. The controller case 52 is formed in a box-like shape with a relatively shallow bottom that is open to one side in the orthogonal direction, and is formed in a substantially rectangular shape with the inclined direction (second direction) as the longitudinal direction when viewed from the open side. Specifically, the controller case 52 includes a bottom wall 52A with the orthogonal direction as the thickness direction, and a side wall 52B that extends from the outer periphery of the bottom wall 52A to one side in the orthogonal direction. An inclined portion 52C is formed at a connection portion of the bottom wall 52A with the side wall 52B. When viewed from the circumferential direction of the controller case 52, the inclined portion 52C inclines outward from the controller case 52 as it approaches the one side in the orthogonal direction, and is connected to the side wall 52B of the controller case 52. The inclined portion 52C is not formed at the connection between the side wall 52B on the other side in the inclined direction and the bottom wall 52A. The controller case 52 is sandwiched from the outside in the left-right direction (first direction) by the housing members 22L and 22R and held in the rear housing portion 24.

[0034] 5, a mounting rib 52D is integrally formed on the left end of the upper surface of the bottom wall 52A of the controller case 52 at a portion on one side in the tilt direction, and the mounting rib 52D is formed as a rib with the tilt direction as its thickness direction. Furthermore, a fixing boss 52E is formed on the left end of the upper surface of the bottom wall 52A of the controller case 52 at a portion on the other side in the tilt direction. The fixing boss 52E is formed in a generally cylindrical shape with its axial direction aligned in the orthogonal direction, and protrudes from the bottom wall 52A of the controller case 52 to one side in the orthogonal direction.

[0035] A raised portion 52F is formed on the right side of the bottom wall 52A of the controller case 52, protruding toward one side in the orthogonal direction. When viewed from the orthogonal direction, the raised portion 52F is formed in a generally rectangular plate shape with the inclined direction as the longitudinal direction. A first step 52G is formed at one end of the raised portion 52F in the inclined direction, extending one step toward one side in the orthogonal direction. The first step 52G extends in the left-right direction. A pair of left and right fixing holes 52H are formed penetrating the first step 52G in the orthogonal direction. A second step 52J is formed at the center of the other end of the raised portion 52F in the inclined direction, extending one step toward one side in the orthogonal direction. The second step 52J is formed in a generally circular shape when viewed from one side in the orthogonal direction. A fixing hole 52K is formed penetrating the orthogonal direction at the approximately center of the second step 52J. One side surface of the first step portion 52G and the second step portion 52J in the orthogonal direction is disposed flush with one another.

[0036] 3 to 5, heat dissipation ribs 52L as a plurality of heat dissipation portions that protrude toward the other side in the orthogonal direction are formed on inclined portion 52C of bottom wall 52A of controller case 52. Heat dissipation ribs 52L are formed in the shape of a substantially triangular plate with the plate thickness direction coinciding with the circumferential direction of controller case 52, and are arranged at predetermined intervals along the circumferential direction of controller case 52.

[0037] A plurality of heat dissipation pins 52M serving as heat dissipation portions are formed on the bottom wall 52A of the controller case 52. Each heat dissipation pin 52M is formed in a generally cylindrical shape with its axial direction aligned in the orthogonal direction, and protrudes from the bottom wall 52A toward the other side in the orthogonal direction. The multiple heat dissipation pins 52M are arranged side by side at predetermined intervals in the left-right direction and the tilt direction. The heat dissipation pins 52M are also formed on the bottom wall 52A on one side in the tilt direction relative to a communication hole 52N, which will be described later.

[0038] A communication hole 52N serving as a communication portion is formed through the bottom wall 52A of the controller case 52 at the other end in the tilt direction. The communication hole 52N is formed as a rectangular elongated hole with the longitudinal direction extending in the left-right direction. This allows the interior and exterior of the controller case 52 to communicate with each other in the perpendicular direction via the communication hole 52N.

[0039] The controller board 51 is formed in a substantially rectangular plate shape with the orthogonal direction as its plate thickness direction. The controller board 51 is disposed inside the controller case 52 and is held by the controller case 52. Specifically, the controller board 51 is placed on one side in the orthogonal direction on the mounting rib 52D, fixing boss 52E, first step portion 52G, and second step portion 52J of the controller case 52, and the controller board 51 is fixed to the controller case 52 by fixing screws SC that are screwed into the fixing boss 52E, fixing hole 52H, and fixing hole 52K.

[0040] A plurality of switching elements 53 (see FIG. 5) are mounted on the surface (one surface in the orthogonal direction) of the controller board 51, and the switching elements 53 are arranged in positions that overlap the raised portions 52F of the controller case 52 when viewed from the orthogonal direction. A heat dissipation sheet 54 (see FIG. 5) made of silicon or the like is provided between the controller board 51 and the raised portions 52F, and the heat dissipation sheet 54 is sandwiched between the controller board 51 and the raised portions 52F and in close contact with both. This allows heat generated by the switching elements 53 to be transferred to the controller case 52 via the heat dissipation sheet 54 and the raised portions 52F, and then dissipated from the heat dissipation ribs 52L and the heat dissipation pins 52M.

[0041] The motor 30 and the switch 41 are electrically connected to the controller board 51 by wiring 55A extending from the surface of the controller board 51. Furthermore, wiring 55B extending from the speed setting unit 46 is connected to the controller board 51 via a connector mounted on the surface of the controller board 51, thereby electrically connecting the speed setting unit 46 (rotary volume 47) and the controller board 51.

[0042] Furthermore, a first connector 56 and a second connector 57 serving as connecting members are mounted on the back surface of the controller board 51 at positions corresponding to the communication holes 52N of the controller case 52, and the first connector 56 and the second connector 57 are disposed within the communication holes 52N (see FIG. 4). A wiring 58 extending from the operation unit 80 is connected to the first connector 56. This electrically connects the operation unit 80 (operation switches 82) and the controller board 51. A wiring 59 extending from the terminal unit 45 is connected to the second connector 57. Furthermore, a wiring 60 serving as a connecting member extending from the controller board 51 passes through the communication holes 52N and is connected to the terminal unit 45. This electrically connects the terminal unit 45 and the controller board 51.

[0043] A packing 61 serving as a lid is provided between the bottom wall 52A of the controller case 52 and the controller board 51, and the packing 61 closes the communication hole 52N of the controller case 52. The packing 61 is made of an elastic material such as rubber. The packing 61 is formed in a substantially rectangular parallelepiped shape with the longitudinal direction in the left-right direction, and the outer periphery of the packing 61 is sandwiched orthogonally between the edge of the communication hole 52N and the controller board 51, causing compression deformation (see FIG. 3). As a result, the packing 61 closes the communication hole 52N and seals the gap between the edge of the communication hole 52N and the controller board 51. The packing 61 is formed with insertion portions 61A through which the first connector 56, the second connector 57, and the wiring 60 are inserted, respectively, and the insertion portions 61A are formed in shapes corresponding to the first connector 56, the second connector 57, and the wiring 60. That is, the first connector 56, the second connector 57, and the wiring 60 are supported by the packing 61 having elasticity.

[0044] The controller case 52 is filled with potting material 62 (see the potting material 62 indicated by the two-dot chain line in FIG. 3) as a sealing material, and the front and back surfaces of the controller board 51 are coated with the potting material 62. The potting material 62 is made of a resin material such as urethane or epoxy, and the liquid potting material 62 is filled into the controller case 52 so as to fill the entire controller board 51, and the potting material 62 is then hardened, thereby coating the front and back surfaces of the controller board 51 with the potting material 62. The gap between the communication hole 52N of the controller case 52 and the controller board 51 is sealed with a packing 61, which prevents the potting material 62 from leaking out of the communication hole 52N.

[0045] The controller 50 is disposed between the left and right air intakes 24A of the rear housing portion 24. As a result, rotation of the fan 34 generates an airflow AR (see FIG. 3) that flows from the air intakes 24A into the handle housing 22, and the airflow AR passes through holes (not shown) formed in the rear wall of the motor housing 21 and flows forward inside the motor housing 21, cooling the controller 50 and the motor 30. Specifically, the airflow AR flows from the air intakes 24A into the space between the controller 50 and the terminal unit 45, and then flows forward from the spaces on both sides of the controller 50 in the tilt direction (see FIG. 3).

[0046] (Action and effect) Next, the operation and effects of the grinder 10 of this embodiment will be described.

[0047] When using the grinder 10 configured as described above to perform processing, the operator grips the handle portion 23 of the housing 20 and operates the operation dial 48 to set the rotation speed of the motor 30. Then, by sliding the switch lever 40 from the OFF position to the ON position, the switch 41 is turned ON, driving the motor 30 and rotating the spindle 71 and grindstone 75. Thus, the grinder 10 can perform grinding or other processing on the workpiece.

[0048] Here, in the grinder 10, the controller 50 that controls the motor 30 is configured to include a controller board 51 and a controller case 52 that houses the controller board 51. The controller case 52 is formed in a box shape that is open on one side in the orthogonal direction. A communication hole 52N is formed through the bottom wall 52A of the controller 50, and a wiring 60 extending from the controller board 51 and a first connector 56 and a second connector 57 mounted on the back surface of the controller board 51 are disposed in the communication hole 52N. Therefore, when connecting the controller board 51 to electrical components (in this invention, the terminal unit 45 and the operation switches 82 of the operation unit 80) that are disposed on a side other than the opening side (one side in the orthogonal direction) of the controller case 52, the electrical components can be connected to the controller board 51 without having to route the wiring extending from the controller board 51 from the opening side of the controller case 52 to the side. In this embodiment, wiring 58 can be drawn directly to the bottom side of controller case 52 to connect controller board 51 and operation switch 82, and wiring 59 and 60 can be drawn directly to the bottom side of controller case 52 to connect controller board 51 and terminal unit 45. This makes it possible to make the arrangement space for controller 50, including wiring 58 to 60, more compact.

[0049] In other words, in a grinder 10 in which the grinding wheel 75, which is the tip tool, is disposed at the front end of the housing 20 and the battery 44 is disposed at the rear end of the housing 20, the controller 50 is disposed between the motor 30 and the terminal unit 45 in the front-to-rear direction. That is, in the grinder 10, the motor 30 and the terminal unit 45 are disposed on both sides in the thickness direction of the controller 50, but even with such an arrangement, it is possible to compact the arrangement space for the controller 50, including the wiring, and ultimately contribute to reducing the size of the grinder 10.

[0050] Furthermore, as described above, the wiring 58 to 60 can be pulled out from the bottom side of the controller case 52 and connected to electrical components, rather than being routed from the opening on one side of the controller case 52 in the perpendicular direction to the side of the controller board 51, thereby improving the workability when assembling the controller 50 to the housing 20.

[0051] Furthermore, a packing 61 that closes the communication hole 52N is provided between the controller board 51 and the controller case 52, and the packing 61 has insertion portions 61A through which the first connector 56, the second connector 57, and the wiring 60 are inserted. Therefore, the communication hole 52N can be closed by the packing 61 while the first connector 56, the second connector 57, and the wiring 60 are disposed in the communication hole 52N. This allows the controller case 52 to be filled with a potting material 62, and the controller board 51 to be covered with the potting material 62, as in the present embodiment. This improves the protection performance of the controller board 51 and ultimately improves the reliability of the grinder 10.

[0052] Furthermore, the packing 61 is made of an elastic material having elasticity such as rubber, and the outer periphery of the packing 61 is compressed and deformed by being sandwiched between the edge of the communication hole 52N in the controller case 52 and the controller board 51. This makes it possible to maintain a good state in which the communication hole 52N is closed by the packing 61. In other words, the packing 61 improves the sealing performance between the controller board 51 and the controller case 52, thereby preventing the potting material 62 from leaking out of the communication hole 52N.

[0053] As described above, the packing 61 has insertion portions 61A through which the first connector 56, the second connector 57, and the wiring 60 are inserted. Therefore, the first connector 56, the second connector 57, and the wiring 60 can be supported by the elastic packing 61. As a result, for example, when external vibrations are input to the first connector 56, the second connector 57, and the wiring 60, the vibrations can be absorbed by the packing 61. Therefore, the packing 61, which seals between the controller board 51 and the controller case 52, can improve the protection performance for the first connector 56, the second connector 57, and the wiring 60.

[0054] In addition, a plurality of heat dissipation ribs 52L and heat dissipation pins 52M are formed on the bottom wall of the controller case 52. This allows heat generated by the switching elements 53 mounted on the controller board 51 to be dissipated from the heat dissipation ribs 52L and heat dissipation pins 52M of the controller case 52.

[0055] Furthermore, communication hole 52N of controller case 52 is formed at the end on the other side in the inclined direction of bottom wall 52A of controller case 52. This allows wiring 58-60 extending from communication hole 52N of controller case 52 to be concentrated and arranged in the other side in the inclined direction in the space between controller case 52 and terminal unit 45. This allows airflow AR flowing in from intake port 24A to flow into the space between controller case 52 and terminal unit 45, allowing controller case 52 to be cooled effectively by airflow AR.

[0056] In the present embodiment, the communication hole 52N of the controller case 52 is formed in the bottom wall 52A of the controller case 52, but the communication hole 52N may also be formed in the side wall 52B of the controller case 52, or the communication hole 52N may be formed so as to straddle the bottom wall 52A and the side wall 52B of the controller case 52. Even in this case, for example, when wiring extending from the controller board 51 is drawn out to the bottom side of the controller case 52, there is no need to route the wiring from the opening of the controller case 52 to the side of the controller case 52. [Explanation of symbols]

[0057] 10 Disc grinder (working machine) 20. Housing 24A Air Intake 30 Motor (drive unit) 44 Battery 45 Terminal unit (terminal part) 50 Controllers 51 Controller board 52 Controller Case (Case) 52A Bottom wall 52B Side wall 56 First connector (connecting member) 57 Second connector (connecting member) 60 Wiring (connecting parts) 61 Packing (lid) 75 Grindstone (cutting tool)

Claims

1. a drive unit that applies a drive force to the tool bit; a controller for controlling the drive unit; a housing that accommodates the drive unit and the controller; Equipped with The controller A controller board; a case that is formed in a box shape with a thickness direction that is the same as the thickness direction of the controller board and that is open on one side in the thickness direction, and that houses the controller board; a first wiring and a second wiring connected to the controller board and extending from the inside to the outside of the case; a terminal portion provided on the housing to which a battery for supplying power to the driving portion is connected; and the drive unit is disposed on one side of the controller in a predetermined direction and spaced apart from the controller, and the terminal unit is disposed on the other side of the controller in the predetermined direction and spaced apart from the controller, the controller board extends in a direction intersecting a predetermined direction, the terminal unit and the controller are electrically connected by the first wiring, and the controller and the drive unit are electrically connected by the second wiring, and power from the battery is supplied to the drive unit via the first wiring and the second wiring, a communication portion is formed in at least one of a side wall and a bottom wall of the case, the communication portion communicating the inside and the outside of the case and through which a part of the first wiring is inserted; The second wiring is configured to extend from a portion of the case that is open on one side in the thickness direction toward the drive unit.

2. a cover member that closes the communication portion is provided between the controller board and the case, The work machine according to claim 1 , wherein the cover member is formed with an insertion portion through which the first wiring is inserted.

3. The cover member is made of an elastic material, 3. The work machine according to claim 2, wherein an outer periphery of the cover member is compressed and deformed by being sandwiched between the controller board and the case.

4. the drive unit is provided on one side of the controller in the predetermined direction, the terminal portion is provided on the other side of the controller in the predetermined direction, A work machine according to any one of claims 1 to 3, wherein the communication portion is formed on the bottom wall of the case, and the terminal portion and the controller board are connected by the first wiring.

5. The work machine according to claim 4, wherein a heat dissipation portion is formed on the bottom wall of the case, the heat dissipation portion protruding in the thickness direction of the controller.

6. directions perpendicular to each other when viewed from the thickness direction of the case are defined as a first direction and a second direction, the housing has an air intake port disposed outside the case in the first direction, The work machine according to claim 5 , wherein the communication portion is formed at an end of the case in the second direction.

7. a drive unit that applies a drive force to the tool bit; a controller for controlling the drive unit; a housing that accommodates the drive unit and the controller; Equipped with The controller A controller board; a case that is formed in a box shape with a thickness direction that is the same as the thickness direction of the controller board and that is open on one side in the thickness direction, and that houses the controller board; a communication section formed on at least one of a side wall and a bottom wall of the case, which communicates the inside and outside of the case, and in which a connection member connected to the controller board is disposed; Including, a cover member that closes the communication portion is provided between the controller board and the case, The cover member has an insertion portion through which the connecting member is inserted, The cover member is made of an elastic material, The outer periphery of the cover member is sandwiched between the controller board and the case and is compressed and deformed.

8. A cover member is provided between the controller board and the case, 2. The work machine according to claim 1, wherein in the case, the lid member closes a space between a space through which the first wiring extends from the controller board and a space that houses the controller board.

9. A raised portion is provided on the inner bottom surface of the case, and the controller board and the raised portion are connected in a manner that allows heat transfer; 9. The work machine according to claim 8, wherein the controller board and the inner bottom surface of the case are spaced apart in the thickness direction at a location different from the raised portion, and the cover member is disposed between the spaced apart controller board and the inner bottom surface of the case.

10. A work machine as described in claim 1, wherein the first wiring extends through the space between the separated case and the terminal portion to electrically connect the controller board and the terminal portion.

11. A fan rotated by the drive unit, 2. The work machine according to claim 1, wherein an air intake port is provided in the housing between the terminal portion and the case in the predetermined direction, and when the fan rotates, air flows in through the air intake port to cool the case.

12. The case has a heat dissipation portion on a bottom wall located on the other side in the thickness direction, The work machine according to claim 11, wherein the heat dissipation portion is cooled by the air flowing in from the air intake port.

13. The controller board is provided with a connector portion to which at least one of the first wiring and a signal wiring for signal transmission connected to the controller can be connected; The work machine according to claim 1 , wherein the connector portion is exposed by the communication portion.

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