Work machine

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 working machine.

Background Art

[0002] In the disk 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 under the control of the control board. Further, a battery pack for supplying power is electrically connected to the control board. Specifically, a terminal connected to the battery pack is provided on 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 the above disk grinder, the control board is housed in a container-shaped board case, the motor is arranged on the opening side of the board case, and the battery pack is arranged on the side opposite to the opening side of the board case. For this reason, for example, the wiring connecting the control board and the terminal passes through the opening of the board case from the control board, is routed to the side of the board case, and is connected to the terminal. Therefore, in the above disk grinder, a space for routing the wiring to the side of the board case is required, and there is a problem that the arrangement space of the controller (control board and board case) including the wiring becomes large.

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine capable of making the arrangement space in the controller compact.

Means for Solving the Problems

[0006] One or more embodiments of the present invention are work machines comprising: a drive unit for applying driving force to a cutting tool; a controller for controlling the drive unit; and a housing for housing the drive unit and the controller, wherein the controller comprises a controller board; a case for housing the controller board, which is formed in a box shape with the thickness direction of the controller board as the thickness direction and open to one side in the thickness direction; and a communication portion formed on at least one of the side wall and bottom wall of the case, which connects the inside and outside of the case and on which a connecting member connected to the controller board is arranged.

[0007] One or more embodiments of the present invention are work machines in which a cover member is provided between the controller board and the case to close the communication portion, and the cover member has an insertion portion formed therein through which the connecting member is inserted.

[0008] One or more embodiments of the present invention are work machines in which the lid member is made of an elastic material, and the outer periphery of the lid member is compressed and deformed by being sandwiched between the controller board and the case.

[0009] One or more embodiments of the present invention are a work machine in which the drive unit is provided on one side of the controller in the thickness direction, a terminal portion to which a battery that supplies power to the drive unit is connected is provided on the other side of the controller in the thickness direction, the communication portion is formed in the bottom wall of the case, and the terminal portion and the controller board are connected by the connecting member.

[0010] One or more embodiments of the present invention are work machines in which a heat dissipation portion protruding 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, when viewed from the thickness direction of the case, the directions that are mutually orthogonal to each other are designated as the first direction and the second direction, the housing has an air intake port located on the outside of the case in the first direction, and the communication portion is formed at the end of the case in the second direction. [Effects of the Invention]

[0012] According to one or more embodiments of the present invention, the placement space of the controller can be made more compact. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view from the left, showing the disc grinder according to this embodiment. [Figure 2] Figure 1 is a side cross-sectional view from the left, showing the inside of the disc grinder. [Figure 3] Figure 2 is a side cross-sectional view showing a magnified view of the area around the controller shown. [Figure 4] Figure 3 shows the controller as viewed from the other side, perpendicular to the direction shown. [Figure 5] Figure 2 is an exploded perspective view of the controller shown. [Modes for carrying out the invention]

[0014] Hereinafter, the 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. The arrows UP, FR, and LH shown in the drawings indicate the top, front, and left sides of the grinder 10, respectively. In the following description, when using the directions of up / down, front / back, and left / right, unless otherwise specified, these refer to the up / down, front / back, and left / right directions of the grinder 10.

[0015] As shown in Figures 1 and 2, the grinder 10 is configured as a tool for performing grinding and other processes on a workpiece. The overall configuration of the grinder 10 will be described first, followed by a description of the controller 50 of the grinder 10.

[0016] (Regarding the overall configuration of Grinder 10) The grinder 10 is formed in a substantially cylindrical shape that extends in the front-rear direction as a whole, and the outer casing of the grinder 10 is made up of a housing 20. The housing 20 is made up of a motor housing 21 which forms the middle part of the housing 20 in the front-rear direction, a handle housing 22 which forms the rear part of the housing 20, and a gear housing 27 which forms the front end of the housing 20.

[0017] (Regarding the motor housing 21) The motor housing 21 is made of resin and is formed in a roughly bottomed cylindrical shape that is open to the front. The motor 30, which serves as the drive unit, is housed inside the motor housing 21. The motor 30 is configured as a brushless motor and is electrically connected to a controller 50, which will be described later, and is driven by the control of the controller 50. The motor 30 consists of a rotating shaft 30A, a rotor 30B, and a stator 30C.

[0018] The rotating shaft 30A is oriented axially in the front-rear direction, and its rear end is rotatably supported by a first motor bearing 31 held in the rear wall of the motor housing 21. The front end of the rotating shaft 30A is located inside a gear housing 27, which will be described later, and its front end portion is rotatably supported by a second motor bearing 32 held in the gear housing 27. A pinion gear 33 is fixed to the front end of the rotating shaft 30A. The rotor 30B is located radially outside 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 oriented axially, and is supported by the motor housing 21 radially outside the rotor 30B.

[0019] On the front end side portion of the rotating shaft 30A, a fan 34 is provided so as to be integrally rotatable on the rear side of the second motor bearing 32. The fan 34 is configured as an axial flow fan, and is configured such that an air flow from the rear side toward the front side is generated by the fan 34.

[0020] A fan guide 35 is provided on the radially outer side of the fan 34. The fan guide 35 is formed in a substantially bottomed cylindrical shape that is open to the front side, and an insertion portion 35A is formed to penetrate through the central portion of the bottom wall of the fan guide 35, and the rotating shaft 30A of the motor 30 is inserted through the insertion portion 35A. The fan guide 35 is assembled to the tip of the stator 30C of the motor 30 and is sandwiched in the front-rear direction by a gear housing 27 and the motor 30, which will be described later.

[0021] A diameter-expanded portion 21A that protrudes outward in the radial direction is formed at the front end portion of the motor housing 21, and the diameter-expanded portion 21A is formed in a substantially rectangular shape when viewed from the front. Also, a switch lever 40 (see FIG. 1) is provided on the left side portion 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 has slid forward from the off position.

[0022] A switch holder 21B is integrally provided on the rear wall of the motor housing 21. The switch holder 21B protrudes rearward from the motor housing 21 and is formed in a roughly rectangular box shape that is open to the right. A switch 41 is held in the switch holder 21B. The switch 41 is electrically connected to a controller 50, which will be described later. When the aforementioned 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, and when the switch lever 40 is slid, the slide bar 42 presses against the switch 41. As a result, the switch 41 is turned on and the motor 30 is driven by the controller 50. The slide bar 42 extends in the front-rear direction within the housing 20, and only the rear end of the slide bar 42 is shown in Figure 2.

[0023] (Regarding the handle housing 22) The handle housing 22 is composed of two housing members 22L and 22R (see Figure 4) that are divided 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, sandwiching the switch holding part 21B from both the left and right sides. In this way, the handle housing 22 is connected to the motor housing 21. The front part of the handle housing 22 is configured as a handle part 23 that is gripped by the operator, and the rear part of the handle housing 22 is configured as a rear housing part 24. The rear housing part 24 protrudes from the handle part 23 both vertically and horizontally. That is, the width dimension (left-right dimension) of the rear housing part 24 is set to be larger than the width dimension of the handle part 23.

[0024] The rear housing portion 24 extends in a direction that slopes towards the rear as it moves upward when viewed from the left and right. In the following description, the direction in which the rear housing portion 24 extends when viewed from the left and right will be referred to as the slope direction (see arrows S1 and S2 in Figures 1 and 2), and the direction perpendicular to the slope direction will be referred to as the orthogonal direction (see arrows V1 and V2 in Figures 1 and 2). Also, the side in the direction of arrow S1 in Figures 1 and 2 will be considered one side of the slope direction, and the side in the direction of arrow V1 in Figures 1 and 2 will be considered one side of the orthogonal direction.

[0025] Multiple air intake ports 24A (see Figure 1) are formed through the left and right side walls of the rear housing portion 24. The air intake ports 24A are formed in the shape of elongated holes with the inclination direction as the longitudinal direction. A pair of 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 directions. This prevents foreign matter from entering the housing 20 from the air intake ports 24A. In addition, most of the outer circumference of the handle housing 22 is covered with a rubber portion 25 (see the gray-filled area in Figure 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 section 24 houses the controller 50. Specifically, the motor 30 and switch 41 mentioned above are located in front of the controller 50. The configuration of the controller 50 will be described later.

[0027] At the rear end of the rear housing portion 24, a battery mounting portion 24B is provided on the other side in the direction perpendicular to the controller 50 for mounting a battery 44. The battery mounting portion 24B extends along the direction of inclination. The battery mounting portion 24B is formed in a concave shape that is open to one side in the direction of inclination and the other side in the direction perpendicular to it. The battery mounting portion 24B is provided with an electrical component and a terminal unit 45 that serves as a terminal for connection to the battery 44. The terminal unit 45 is sandwiched from the outside in the left and right directions by housing members 22L and 22R and assembled to the rear housing portion 24. The terminal unit 45 is electrically connected to the controller 50. The battery 44 is detachably mounted to the battery mounting portion 24B from one side in the direction of inclination, 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 24 on one side in the direction of inclination of the controller 50. The speed setting unit 46 is configured as a mechanism for setting the target rotational speed of the motor 30. The speed setting unit 46 includes a rotary potentiometer 47 and an operating dial 48. The operating dial 48 is formed in a disc shape with its thickness direction approximately in the direction of inclination, and is configured to be rotatable with its axial direction approximately in the direction of inclination. A portion of the operating dial 48 is exposed to the rear housing 24 in one direction perpendicular to it so as to be operable. The rotary potentiometer 47 is configured as a rotary variable resistor and is electrically connected to the controller 50. The rotary potentiometer 47 is also connected to the operating dial 48 and outputs an output signal to the controller 50 according to the rotational position of the operating dial 48, and the controller 50 sets the rotational speed of the motor 30's rotation shaft 30A.

[0029] An operating section 80 is provided at the lower end of the rear housing section 24, on the other side of the inclination direction of the controller 50. The operating section 80 is configured as a mechanism for operating the lighting section 77. The operating section 80 includes an operating button 81 and an operating switch 82. The operating button 81 is exposed from the outer circumference of the rear housing section 24 so as to be pressable. The operating switch 82 is configured as a tactile switch or the like and is electrically connected to the controller 50. When the operating button 81 is pressed, the operating switch 82 is turned on, and an ON signal is output from the operating switch 82 to the controller 50.

[0030] (Regarding gear housing 27) The gear housing 27 is formed in a hollow shape that forms a roughly triangular shape when viewed from the left and right directions, and is open to the bottom. A connecting portion 27A is formed at the rear end of the gear housing 27, and the connecting portion 27A is formed in a roughly rectangular cylindrical shape that corresponds to the enlarged diameter portion 21A of the motor housing 21. The connecting portion 27A and the enlarged diameter portion 21A are abutted together in the front-rear direction, and the outer circumference of the connecting portion 27A is fastened and fixed to the enlarged diameter portion 21A. A packing land 70 is provided on the lower side of the gear housing 27. The packing land 70 is formed in a stepped cylindrical shape with the vertical direction as its axial direction, and is fixed to the gear housing 27.

[0031] A spindle 71 is provided inside the gear housing 27, and the spindle 71 is formed in a substantially cylindrical shape with its vertical direction as the axial direction. The upper end of the spindle 71 is rotatably supported by a bearing 72 fixed to the gear housing 27, and the middle part of the spindle 71 in the vertical direction is rotatably supported by a bearing 73 fixed to the packing land 70. A bevel gear 74 is integrally rotatably provided on the upper end portion of the spindle 71, and the pinion gear 33 of the motor 30 is meshed with the bevel gear 74. As a result, the driving force of the motor 30 is transmitted to the spindle 71 by the bevel gear 74. A grinding wheel 75, which serves as a cutting tool, is attached to the lower end of the spindle 71, and the grinding wheel 75 is formed in a substantially circular disc shape with its vertical direction as the thickness direction. As a result, the grinding wheel 75 rotates together with the spindle 71 by the driving force of the motor 30, performing polishing and other processes on the workpiece. Furthermore, a wheel guard 76 is detachably fixed to the lower end of the packing land 70, and the rear of the grinding wheel 75 is covered by the wheel guard 76 from above and behind.

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

[0033] (Regarding Controller 50) As shown in Figures 2 to 5, the controller 50 is composed of a controller board 51 and a controller case 52 which 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 the shape of a relatively shallow box with an opening on one side in the orthogonal direction, and is formed in a substantially rectangular shape with the inclination direction (second direction) as the longitudinal direction when viewed from the opening side. Specifically, the controller case 52 is composed of a bottom wall 52A with the thickness direction being the orthogonal direction, and a side wall 52B extending from the outer circumference of the bottom wall 52A to one side in the orthogonal direction. An inclined portion 52C is formed at the connection point between the bottom wall 52A and the side wall 52B, and the inclined portion 52C is inclined outward from the controller case 52 as it is directed toward one side in the orthogonal direction when viewed from the circumferential direction of the controller case 52, and is connected to the side wall 52B of the controller case 52. Furthermore, the inclined portion 52C is not formed at the connection between the side wall 52B and the bottom wall 52A on the other side in the inclination direction. The controller case 52 is held in the rear housing portion 24 by being sandwiched from the outside in the left-right direction (first direction) by the housing members 22L and 22R.

[0034] As shown in Figure 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, on one side in the direction of inclination. The mounting rib 52D is formed in a rib shape with the inclination direction as the thickness direction. In addition, a fixed boss 52E is formed on the left end of the upper surface of the bottom wall 52A of the controller case 52, on the other side in the direction of inclination. The fixed boss 52E is formed in a substantially cylindrical shape with the orthogonal direction as the axial direction, and protrudes from the bottom wall 52A of the controller case 52 on 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, rising in one direction perpendicular to the other. The raised portion 52F is formed in a substantially rectangular plate shape with the inclination direction as the longitudinal direction when viewed from the perpendicular direction. At the end of the raised portion 52F on one side in the inclination direction, a first stepped portion 52G is formed, rising one step in one direction perpendicular to the other, and the first stepped portion 52G extends in the left-right direction. A pair of fixing holes 52H are formed through the first stepped portion 52G in the perpendicular direction. At the other end of the raised portion 52F on the inclination direction, a second stepped portion 52J is formed in the left-right center, rising one step in one direction perpendicular to the other, and the second stepped portion 52J is formed in a substantially circular shape when viewed from one side perpendicular to the other. A fixing hole 52K is formed through the approximate center of the second stepped portion 52J in the perpendicular direction. The first stepped section 52G and the second stepped section 52J have one orthogonal side surface that is flush with the surface.

[0036] As shown in Figures 3 to 5, the inclined portion 52C of the bottom wall 52A of the controller case 52 has multiple heat dissipation ribs 52L that protrude to the other side in the perpendicular direction. The heat dissipation ribs 52L are formed in a substantially triangular plate shape with the circumferential direction of the controller case 52 as the plate thickness direction, and are arranged along the circumferential direction of the controller case 52 at predetermined intervals.

[0037] Multiple heat dissipation pins 52M are formed on the bottom wall 52A of the controller case 52. The heat dissipation pins 52M are formed in a substantially cylindrical shape with the axis oriented in the orthogonal direction and protrude from the bottom wall 52A to the other orthogonal direction. The multiple heat dissipation pins 52M are arranged in a line with predetermined intervals in the left-right direction and the inclined direction. In addition, the heat dissipation pins 52M are formed on the bottom wall 52A on one side in the inclined direction relative to the communication hole 52N, which will be described later.

[0038] A communication hole 52N is formed through the bottom wall 52A of the controller case 52 at the other end in the direction of inclination, serving as a communication section. The communication hole 52N is formed in the shape of a rectangular elongated hole with the left-right direction as its longitudinal direction. As a result, the inside and outside of the controller case 52 are connected in a perpendicular direction by the communication hole 52N.

[0039] The controller board 51 is formed in a substantially rectangular plate shape with the thickness direction being perpendicular to the direction of the board. The controller board 51 is placed inside the controller case 52 and is also held by the controller case 52. Specifically, the controller board 51 is placed on the mounting rib 52D, fixing boss 52E, first stepped portion 52G, and second stepped portion 52J of the controller case 52 from one side perpendicular to the mounting rib 52D, fixing boss 52E, first stepped portion 52G, and second stepped portion 52J, 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] Multiple switching elements 53 (see Figure 5) are mounted on the surface (one side in the orthogonal direction) of the controller board 51. The switching elements 53 are positioned so as to overlap with the raised portion 52F of the controller case 52 when viewed from the orthogonal direction. A heat dissipation sheet 54 (see Figure 5), made of silicon or the like, is provided between the controller board 51 and the raised portion 52F. The heat dissipation sheet 54 is sandwiched between the controller board 51 and the raised portion 52F and is in close contact with both. As a result, the heat generated by the switching elements 53 is transferred to the controller case 52 via the heat dissipation sheet 54 and the raised portion 52F, and then dissipated from the heat dissipation ribs 52L and heat dissipation pins 52M.

[0041] Furthermore, the motor 30 and switch 41 are electrically connected to the controller board 51 by wiring 55A extending from the surface of the controller board 51. In addition, 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 are mounted on the back surface of the controller board 51 at positions corresponding to the communication hole 52N of the controller case 52, and the first connector 56 and the second connector 57 are located within the communication hole 52N (see Figure 4). A wire 58 extending from the operating unit 80 is connected to the first connector 56. This electrically connects the operating unit 80 (operating switch 82) and the controller board 51. A wire 59 extending from the terminal unit 45 is connected to the second connector 57. In addition, a wire 60, which is a connecting member extending from the controller board 51, passes through the communication hole 52N and is connected to the terminal unit 45. This electrically connects the terminal unit 45 and the controller board 51.

[0043] Furthermore, a gasket 61 is provided as a lid between the bottom wall 52A of the controller case 52 and the controller board 51, and the gasket 61 closes the communication hole 52N of the controller case 52. The gasket 61 is made of an elastic material such as rubber. The gasket 61 is formed in a substantially rectangular parallelepiped shape with the left-right direction as its longitudinal direction, and the outer circumference of the gasket 61 is compressed and deformed by being sandwiched orthogonally between the edge of the communication hole 52N and the controller board 51 (see Figure 3). As a result, the gasket 61 closes the communication hole 52N and seals the space between the edge of the communication hole 52N and the controller board 51. The gasket 61 has insertion portions 61A through which the first connector 56, the second connector 57, and the wiring 60 are inserted, and the insertion portions 61A are formed in shapes corresponding to the first connector 56, the second connector 57, and the wiring 60. In other words, the first connector 56, the second connector 57, and the wiring 60 are supported by an elastic packing 61.

[0044] Furthermore, the controller case 52 is filled with a potting material 62 (see the potting material 62 shown by the dashed line in Figure 3) as a sealing material, and the front and back surfaces of the controller substrate 51 are covered 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 cover the entire controller substrate 51, and the potting material 62 is hardened so that the front and back surfaces of the controller substrate 51 are covered with the potting material 62. The space between the communication hole 52N of the controller case 52 and the controller substrate 51 is sealed by a packing 61, so that the outflow of the potting material 62 from the communication hole 52N is suppressed by the packing 61.

[0045] Furthermore, the controller 50 is positioned between the left and right air intake ports 24A of the rear housing 24. As a result, when the fan 34 rotates, an airflow AR (see Figure 3) is generated that flows into the handle housing 22 from the air intake ports 24A. This airflow AR passes through holes (not shown) formed in the rear wall of the motor housing 21 and flows forward through the motor housing 21, cooling the controller 50 and the motor 30. Specifically, the airflow AR flows from the air intake ports 24A into the space between the controller 50 and the terminal unit 45, and flows forward from the spaces on both sides in the inclined direction relative to the controller 50 (see Figure 3).

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

[0047] When processing with the grinder 10 configured as described above, the operator grips the handle portion 23 of the housing 20 and operates the control 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, the motor 30 is driven, and the spindle 71 and grinding wheel 75 rotate. Thus, the grinder 10 can perform grinding and other processes on the workpiece.

[0048] In the grinder 10, the controller 50 that controls the motor 30 includes 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 opens to one side in the orthogonal direction. A communication hole 52N is formed through the bottom wall 52A of the controller 50, and 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 arranged in the communication hole 52N. Therefore, when connecting electrical components (in this invention, terminal unit 45 and operating switch 82 of the operating unit 80) located on sides other than the opening side (one side in the orthogonal direction) of the controller case 52 to the controller board 51, the wiring extending from the controller board 51 can be connected to the controller board 51 without having to route the electrical components to the controller board 51 laterally from the opening side of the controller case 52. In this embodiment, wiring 58 can be directly routed to the bottom of the controller case 52 to connect the controller board 51 and the operation switch 82, and wiring 59 and 60 can be directly routed to the bottom of the controller case 52 to connect the controller board 51 and the terminal unit 45. This makes it possible to reduce the size of the space required for the controller 50, including the wiring 58-60.

[0049] In other words, in a grinder 10 in which the grinding wheel 75, which is the tip tool, is placed at the front end of the housing 20 and the battery 44 is placed at the rear end of the housing 20, the controller 50 is positioned between the motor 30 and the terminal unit 45 in the front-rear direction. That is, in the grinder 10, the motor 30 and the terminal unit 45 are positioned on both sides of the controller 50 in the thickness direction. Even with such an arrangement, the space required for the controller 50, including the wiring, can be made more compact, and consequently, this can contribute to making the grinder 10 smaller in size.

[0050] Furthermore, as described above, since the wiring 58-60 can be routed from the bottom of the controller case 52 to the side of the controller board 51 without having to run it through the opening on one orthogonal side of the controller case 52, and connected to the electrical components, the workability when assembling the controller 50 into the housing 20 can be improved.

[0051] Furthermore, a packing 61 is provided between the controller board 51 and the controller case 52 to close the communication hole 52N, 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 placed inside the communication hole 52N. As a result, as in this embodiment, the controller case 52 can be filled with potting material 62 and the controller board 51 can be covered with the potting material 62. Therefore, the protective performance of the controller board 51 can be improved, and consequently, the reliability of the grinder 10 can be improved.

[0052] Furthermore, the packing 61 is made of an elastic material such as rubber, and its outer circumference is compressed and deformed by being sandwiched between the edge of the communication hole 52N in the controller case 52 and the controller substrate 51. As a result, the packing 61 can maintain a good closed state of the communication hole 52N. In other words, the packing 61 improves the sealing performance between the controller substrate 51 and the controller case 52, thereby suppressing the outflow of the potting material 62 from the communication hole 52N.

[0053] Furthermore, 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 elastic packing 61 can support the first connector 56, the second connector 57, and the wiring 60. As a result, for example, when external vibrations are input to the first connector 56, the second connector 57, and the wiring 60, the packing 61 can absorb those vibrations. Thus, the packing 61 sealing between the controller board 51 and the controller case 52 can provide high protection for the first connector 56, the second connector 57, and the wiring 60.

[0054] Furthermore, multiple heat dissipation ribs 52L and heat dissipation pins 52M are formed on the bottom wall of the controller case 52. This allows the heat generated by the switching element 53 mounted on the controller board 51 to be dissipated through the heat dissipation ribs 52L and heat dissipation pins 52M of the controller case 52.

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

[0056] In this embodiment, the communication hole 52N of the controller case 52 is formed in the bottom wall 52A of the controller case 52. However, the communication hole 52N may also be formed in the side wall 52B of the controller case 52, or it may be formed so as to span both the bottom wall 52A and the side wall 52B of the controller case 52. In this case as well, for example, when wiring extending from the controller board 51 is pulled out to the bottom side of the controller case 52, it is no longer necessary 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 tool) 20 Housing 24A Air intake 30 Motor (drive unit) 44 Batteries 45 Terminal unit (terminal section) 50 Controllers 51 Controller board 52 Controller Case (Case) 52A Bottom wall 52B Side wall 56. First connector (connecting component) 57. Second connector (connecting component) 60 Wiring (connecting components) 61. Gasket (Lid part) 75 Grinding wheels (cutting tools)

Claims

1. A drive unit that applies a driving force to the tool tip; 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 of the controller board and that is open on one side in the thickness direction, and that houses the controller board; having The housing is provided with a terminal portion to which a battery for supplying power to the driving unit is connected, the drive unit is located on one side of the controller in a predetermined direction, and the terminal unit is located on the other side of the controller in the predetermined direction; the controller board extends in a direction intersecting a predetermined direction, the terminal unit and the controller are electrically connected by a first wiring, and the controller and the drive unit are electrically connected by a second wiring, and power from the battery is supplied to the drive unit via the first wiring and the second wiring; a communication portion that communicates between the inside and the outside of the case and in which the first wiring is disposed is formed in at least one of a side wall and a bottom wall of the case; 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, The work machine according to any one of claims 1 to 3, wherein the communication portion is formed on a 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 a bottom wall of the case, the heat dissipation portion protruding in the thickness direction of the controller.

6. When viewed from a thickness direction of the case, directions perpendicular to each other 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 portion of the case in the second direction.

7. A drive unit that applies a driving force to the tip tool; A controller for controlling the drive unit; a housing that accommodates the drive unit and the controller; a terminal portion to which a battery for supplying power to the driving portion is connected; Equipped with The controller: 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 houses the controller board; having the housing holds the controller and the terminal portion, and has a battery mounting portion into which the battery can be mounted; the controller board is housed inside the case so as to extend in a direction in which the battery is attached to the battery attachment portion, At least one of the side wall and the bottom wall of the case is formed with a communication part that communicates between the inside and the outside of the case, a first wiring and a second wiring are connected to the controller board, the first wiring extends to the outside of the case via the communication portion, and the second wiring extends to the outside of the case from a portion of the case that is open to one side in the thickness direction; A working machine configured so that power from the battery is supplied to the drive unit via the terminal portion, the first wiring, and the second wiring.

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