Work machine
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Filing Date
- 2026-01-21
- Publication Date
- 2026-04-22
Abstract
Description
Work equipment
[0001] The present invention relates to a work machine.
[0002] In the portable circular saw described in Patent Document 1, the driving force of a motor is transmitted to a saw blade, which rotates to cut a workpiece. The motor is electrically connected to a control unit (controller) via wiring (motor wires), and the motor is driven by the control unit. The motor is housed in a motor housing, and the control unit is located above the motor and housed in a handle housing.
[0003] Japanese Patent Application Laid-Open No. 2019-33649
[0004] In a work machine such as the portable circular saw, the increasing functionality and power output of the work machine has led to an increase in the size of electronic components such as the controller, and an increase in the number and diameter of the wires connecting the motor and the controller. These factors can lead to an increase in the size of the work machine and a decrease in assembly efficiency. Therefore, it is desirable to design a work machine with a structure that can prevent an increase in size or a decrease in assembly efficiency.
[0005] In consideration of the above, an object of the present invention is to provide a work machine that can be prevented from becoming larger or from becoming easier to assemble.
[0006] One or more embodiments of the present invention are a work machine comprising a motor having a stator and a rotor, an operating unit that operates when driven by the motor, a housing that supports the motor and the operating unit, a controller that controls the motor, and motor wires that connect the motor and the controller, wherein the housing includes a motor case having a motor accommodating section that accommodates the motor, the controller is held in the motor case outside the motor accommodating section, the motor case has a wiring hole that connects the inside and outside of the motor accommodating section, the motor wires are routed while being held in the wiring hole, the motor case is composed of a first case and a second case that are separated, and the wiring hole is formed by assembling the first case and the second case together.
[0007] One or more embodiments of the present invention are a work machine in which the housing has a controller cover portion, the controller is held in the motor case radially outside the motor, and the controller and motor wires are covered so as not to be visible by the motor case and controller cover portion.
[0008] In one or more embodiments of the present invention, the controller has a controller board to one side of which the motor wire is connected, and the controller is held in the motor case with at least a portion of one side of the controller board open radially outward, and is covered from the radially outward side by the controller cover portion, which is a work machine.
[0009] One or more embodiments of the present invention are directed to a work machine in which the wiring hole is arranged on one side of the motor in the axial direction relative to the controller when viewed from the radial outside of the motor.
[0010] One or more embodiments of the present invention are a work machine in which the housing includes a handle housing having a grip portion that is held by an operator, and the controller cover portion forms part of the handle housing.
[0011] One or more embodiments of the present invention are a work machine in which the controller is positioned above the motor, the controller cover portion is located above the motor case and covers the controller from above, both front-to-rear and both left-to-right, and the controller cover portion has an assembly portion that is assembled to the motor case, and the assembly portion is located below the controller.
[0012] One or more embodiments of the present invention are a work machine in which the motor is arranged with its axial direction perpendicular to the vertical direction, the motor case is divided in a direction perpendicular to the vertical direction, the controller cover portion has the assembly portion, and the assembly portion prevents the first case and the second case from moving apart in the direction in which the motor case is divided.
[0013] One or more embodiments of the present invention are a work machine in which the motor case is composed of the first case and the second case divided in the radial direction of the motor, and a pair of grooves are formed on the outer periphery of the motor case, which are open outward in the direction of division of the motor case and to one side in the axial direction, and the assembly part is inserted into the grooves from one side in the axial direction, so that the assembly part and the grooves engage in the vertical direction.
[0014] One or more embodiments of the present invention are a work machine in which the wiring hole is positioned on one axial side of the motor relative to the controller, and the grip portion is positioned on the other axial side of the controller.
[0015] One or more embodiments of the present invention are a work machine in which the motor has a sensor board to which the motor wires are connected, the sensor board is arranged on one axial side of the motor relative to the stator, the gripping portion is located on the other axial side of the stator, and the wiring hole is located on one axial side of the sensor board.
[0016] One or more embodiments of the present invention are a work machine in which the controller is located radially outside the motor, the wiring hole is arranged on one axial side of the motor relative to the controller, the operating part is arranged on the other axial side relative to the stator, and the motor wire extends from the motor to one axial side.
[0017] In one or more embodiments of the present invention, the motor case is formed in a cylindrical shape with a bottom that is open on the other side in the axial direction.
[0018] In one or more embodiments of the present invention, a controller holding portion that holds the controller is provided on the outer periphery of the motor case, and the controller holding portion clamps the controller in the direction in which the motor case is divided.
[0019] In one or more embodiments of the present invention, the motor case is configured by the first case and the second case that are divided in a radial direction of the motor.
[0020] One or more embodiments of the present invention are a work machine comprising: a motor having a stator and a rotor; a motor wire extending from the motor to one axial side of the motor; an operating unit arranged on the other axial side of the stator and operated by driving the motor; a housing supporting the motor and the operating unit; and a controller electrically connected to the motor by the motor wire and controlling the motor, wherein the housing includes a motor case having a motor accommodating section that accommodates the motor, the controller is held in the motor case outside the motor accommodating section, and the motor wire extending from the motor is routed from the inside to the outside of the motor accommodating section on one axial side of the stator and connected to the controller.
[0021] According to one or more embodiments of the present invention, it is possible to suppress an increase in size or a deterioration in ease of assembly.
[0022] 1 is a plan view showing the circular saw according to the present embodiment, as seen from above. It is a side view of the circular saw shown in FIG. 1, as seen from the left side. It is a cross-sectional view (cross-sectional view taken along line 3-3 in FIG. 2) showing the interior of the circular saw shown in FIG. 2, as seen from the front side. It is a cross-sectional view (cross-sectional view taken along line 4-4 in FIG. 3) showing the power supply wire of the sensor board shown in FIG. 3 held by the first wiring hole, as seen from the left side. It is a cross-sectional view (cross-sectional view taken along line 5-5 in FIG. 3) showing the controller cover part shown in FIG. 3 assembled to the motor case, as seen from the left side. It is a side view showing the periphery of the motor case shown in FIG. 4, with the left housing member of the handle housing and the rear case of the motor case removed. It is a plan view showing the periphery of the motor case with the left housing member of the handle housing removed, as seen from the rear. It is a rear view showing an enlarged view of the periphery of the left end of the motor case shown in FIG. 6. (A) is a rear view showing the front case of the motor case shown in FIG. 2 alone, as seen from the rear, and (B) is a side view of the front case of (A), as seen from the right side. 3A is a side view of the rear case of the motor case shown in FIG. 2 alone, as seen from the right side, and FIG. 3B is a front view of the rear case of FIG. 3A, as seen from the front side.
[0023] The following describes a circular saw 10 as a work machine according to this embodiment, with reference to the drawings. Note that the arrows UP, FR, and LH shown as appropriate in the drawings respectively indicate the upper side, front side, and left side of the circular saw 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 circular saw 10 unless otherwise specified.
[0024] 1 and 2, the circular saw 10 is configured as a power tool for cutting workpieces. The circular saw 10 includes a base 12 and a circular saw body 20.
[0025] (Regarding the base 12) As shown in FIGS. 1 to 3, the base 12 is formed in a generally rectangular plate shape with its thickness extending vertically and its length extending forward and backward. When using the circular saw 10 for cutting, the base 12 is placed on a workpiece and moved forward. An insertion portion 12A is formed through the right portion of the base 12 for receiving a circular saw blade 14 (broadly understood as a tool tip). The insertion portion 12A is formed in a generally rectangular shape with its length extending forward and backward. The circular saw blade 14 is formed in a generally circular plate shape with its thickness extending left and right. The center of the circular saw blade 14 is fixed to a spindle 68 of the drive mechanism 50 (described later) for integral rotation. The circular saw blade 14 is positioned within the insertion portion 12A, with its upper portion projecting upward from the base 12 and its lower end portion projecting downward from the base 12.
[0026] (Circular Saw Body 20) The circular saw body 20 includes a housing 22, a drive mechanism 50, and a controller 80.
[0027] (Regarding the housing 22) The housing 22 is made up of multiple housing members, forms the outer shell of the circular saw body 20, and is disposed above the base 12. The housing 22 includes a saw cover 24 (broadly speaking, an element that can be understood as a tool cover) that covers the circular saw blade 14, a handle housing 26, and a motor case 30.
[0028] The saw cover 24 constitutes the right portion (right end) of the housing 22. The saw cover 24 is formed in a generally semicircular plate shape with a thickness extending in the left-right direction and a concave shape that is open downward. The upper portion of the circular saw blade 14 is housed within and covered by the saw cover 24. The front end of the saw cover 24 is connected to the base 12 by the front connecting mechanism 16, and the rear end of the saw cover 24 is connected to the base 12 by the rear connecting mechanism 18. More specifically, the saw cover 24 and the base 12 are connected via front and rear link members of a well-known cutting depth adjustment mechanism. This connects the circular saw body 20 to the base 12.
[0029] The saw cover 24 is provided with a support portion 24A that supports a spindle 68 (described later). The support portion 24A is generally cylindrical and open to the right. It protrudes leftward (toward the motor 52) from a central portion in the front-to-rear direction at the lower end of the left side of the saw cover 24. The support portion 24A is formed with a hole that supports the spindle 68 (described later), as well as bosses and holes for securing the motor case 30 (described later). An LED holder 90A is provided on the front side of the motor case 30, extending to the front end of the saw cover 24, and holds an LED 90. LED wiring 90B (see FIGS. 7 and 11 ) extending from the controller 80 (described later) is connected to the LED 90, thereby supplying power to the LED 90. The LED holder 90A is provided with an exhaust port (not shown), which is located in front of the saw cover 24. When the motor 52 is running, air generated by the fan 66 is exhausted toward the workpiece, etc., to remove chips and the like.
[0030] The motor case 30 constitutes the left portion (left end) of the housing 22. The motor case 30 is formed as a generally rectangular cylinder with a bottom that is open to the right. The motor case 30 has a motor housing portion 30A that houses a motor 52, which will be described later. The motor case 30 is disposed to the left of the support portion 24A of the saw cover 24, and is fastened to the support portion 24A with a second set screw 38. Details of the motor case 30 will be described later.
[0031] The handle housing 26 is disposed to the left of the saw cover 24 and above the motor case 30, and is fastened to a support portion 24A of the saw cover 24. The handle housing 26 has a controller cover portion 26A, which constitutes the front portion at the lower end of the handle housing 26. The controller cover portion 26A is formed in the shape of a generally rectangular box with a relatively shallow bottom that is open downwards, and is disposed above the motor case 30. The controller cover portion 26A, together with the motor case 30, is configured to cover the controller 80 (described later) so that it cannot be seen. Details of the controller cover portion 26A will be described later.
[0032] The handle housing 26 has a battery holder portion 26B. The battery holder portion 26B is formed in a generally flat shape with its thickness extending vertically and extends rearward from the lower end of the rear end of the controller cover portion 26A. The battery holder portion 26B holds a battery 40 (see FIG. 1). More specifically, the battery 40 is attached to the battery holder portion 26B from the rear side and is disposed below the battery holder portion 26B and behind the motor case 30. The battery 40 is electrically connected to a controller 80, which will be described later.
[0033] The handle housing 26 has a handle portion 26C as a grip, which is located above the right ends of the controller cover portion 26A and the battery holder portion 26B. The handle portion 26C is formed in a generally hollow column shape and is inclined upward toward the front when viewed from the left. The front end of the handle portion 26C is bent diagonally downward and forward and connected to the controller cover portion 26A, and the rear end of the handle portion 26C is bent downward and connected to the battery holder portion 26B.
[0034] Here, the handle housing 26 is divided into two parts in the left-right direction at the left-right intermediate portion of the handle portion 26C. That is, the handle housing 26 includes a right housing member 27 (broadly understood as a first housing member) that constitutes the right portion of the handle housing 26 (including the right end portion) and a left housing member 28 (broadly understood as a second housing member) that constitutes the left portion of the handle housing 26 (see FIG. 11 ). The right housing member 27 and the left housing member 28 are fastened and fixed to each other to form the handle housing 26. As shown in FIG. 11 , the battery holder portion 26B is also formed by combining the right housing member 27 and the left housing member 28. The battery holder portion 26B includes rails (not shown) provided on the right housing member 27 and the left housing member 28, respectively. The rails engage with battery-side rails 40B provided on the battery 40, thereby holding the battery 40 in the battery holder portion 26B. The battery holder portion 26B is provided with a battery terminal 40A that is sandwiched between the right housing member 27 and the left housing member 28. The battery 40 held in the battery holder portion 26B is electrically connected to the battery terminal 40A, and is electrically connected to the controller 80.
[0035] A trigger 42 (see FIG. 2) is provided at the front end of the handle portion 26C so as to be operable when pulled. A switch 44 (see FIG. 2) is provided inside the handle portion 26C. The switch 44 is electrically connected to the battery 40 by a power line 44A (see FIG. 11). The switch 44 is also electrically connected to a controller 80 (described later) by a power line 44B (see FIG. 11) and a signal line 44C (see FIG. 11). When the trigger 42 is operated, the switch 44 outputs an ON signal to the controller 80 via the signal line 44C, and the controller 80 drives and controls a motor 52 (described later), causing the spindle 68 to rotate.
[0036] (Regarding the Drive Mechanism 50) As shown in FIG. 3, the drive mechanism 50 includes a motor 52 and a spindle 68 as an actuator. The motor 52 is an inner rotor brushless motor housed in a motor housing portion 30A of the motor case 30 and electrically connected to a controller 80 (described later). The motor 52 includes a motor shaft 52A, a rotor 52B, and a stator 52C. The motor shaft 52A is axially disposed in the left-right direction. The left end of the motor shaft 52A is rotatably supported by a motor bearing 54 held in the motor case 30, and the right end of the motor 52 is rotatably supported by a motor bearing 56 held in the support portion 24A of the saw cover 24. A pinion gear 52A1 is formed on the right end of the motor shaft 52A.
[0037] The rotor 52B is formed in a generally cylindrical shape with its axial direction extending in the left-right direction and is connected to the axially middle portion of the motor shaft 52A so as to be rotatable together with the rotor 52B. The stator 52C is formed in a generally cylindrical shape with its axial direction extending in the left-right direction and is located radially outward of the rotor 52B. The stator 52C has a stator coil wound around a stator core and connected to a sensor board 58 (stator board). As shown in FIGS. 3, 4, 6, and 8, the sensor board 58 is formed in a generally annular plate shape with its plate thickness extending in the left-right direction. The sensor board 58 is located to the left of the stator 52C (one axial side of the motor shaft 52A) and radially outward of the motor shaft 52A and is supported by a stator holder of the stator 52C.
[0038] A plurality of (five in this embodiment) relay elements 60 are provided on the left surface (one side surface) of the sensor board 58. Each relay element 60 is formed in a substantially rectangular parallelepiped shape, and the plurality of relay elements 60 are arranged in a line in the circumferential direction of the sensor board 58. Specifically, the relay elements 60 are arranged in a portion of the sensor board 58 excluding an upper and front region (the hatched region in FIG. 4 , hereinafter referred to as a line-processed region 58A). The relay elements 60 are turned on and off by a controller 80 (described later), thereby switching the stator coil between a delta connection and a star connection. In other words, the relay elements 60 function as switching elements for switching the connection of the stator coil.
[0039] Three power lines 62U, 62V, and 62W are connected to the left surface of the sensor board 58 as motor lines. The power line 62U is configured to supply a U-phase drive current, the power line 62V is configured to supply a V-phase drive current, and the power line 62W is configured to supply a W-phase drive current. The power lines 62U, 62V, and 62W extend leftward from the sensor board 58 and are connected to a controller 80 (described later). Multiple (nine in this embodiment, see FIG. 7 ) signal lines 64 are also provided on the left surface of the sensor board 58 as motor lines. The signal lines 64 extend leftward from a line processing region 58A of the sensor board 58 and are connected to the controller 80 (described later). The motor lines are wiring that connect the controller 80 to the sensor board 58 (stator board), and are collectively indicated by the reference numeral 61 in FIG. 11 .
[0040] 3, a fan 66 is provided at the rear end of the motor shaft 52A between the stator 52C and the motor bearing 56 so as to be able to rotate integrally with the motor shaft 52A. The fan 66 is configured as a so-called centrifugal fan, and causes air flowing in from the left side of the fan 66 to flow radially outward, thereby generating an airflow AR that flows to the right within the motor housing portion 30A.
[0041] The spindle 68 is disposed below the motor shaft 52A with its axial direction aligned in the left-right direction, and is rotatably supported by the support portion 24A of the saw cover 24. An output gear 70 is provided at the left end of the spindle 68 so as to rotate integrally therewith, and the output gear 70 meshes with the pinion gear 52A1 of the motor shaft 52A. The center of the circular saw blade 14 is fixed to the right end of the spindle 68 by a fixing bolt 72. As a result, when the motor 52 is driven, the spindle 68 and the circular saw blade 14 rotate around the axis of the spindle 68.
[0042] (Regarding the Motor Case 30) As shown in Figures 1 to 11, the motor case 30 is formed as a generally rectangular cylinder with a bottom that is open to the right. As described above, a motor housing section 30A is formed inside the motor case 30, and the motor 52 and fan 66 are housed in the motor housing section 30A. The motor case 30 is divided into two sections in the front-to-rear direction. Specifically, the motor case 30 includes a front case 32 serving as a first case that constitutes the front portion of the motor case 30, and a rear case 34 serving as a second case that constitutes the rear portion of the motor case 30. The motor case 30 is formed by assembling the front case 32 and the rear case 34 together.
[0043] The front case 32 is formed with a plurality of (five in this embodiment) first fixing bosses 30B (see FIG. 9A ) for fixing the rear case 34. Each first fixing boss 30B is formed in a generally cylindrical shape with its axial direction aligned in the front-to-rear direction and extends rearward from the front wall of the front case 32. The first fixing bosses 30B are provided at both vertical ends of the left end of the front case 32, both vertical ends of the right end portion of the front case 32, and the upper end of the right end of the front case 32. The rear case 34 is formed with five fixed portions 30C (see FIGS. 3 and 10B ) at positions corresponding to the first fixing bosses 30B of the front case 32. Each fixed portion 30C is formed in a concave shape that is open to the rear, and a fixing hole 30D is formed through the bottom wall of each fixed portion 30C. Then, a first fixing screw 36 (see FIG. 3) is inserted into the fixed portion 30C from the rear side, and the first fixing screw 36 passes through the fixing hole 30D and is threaded into the first fixing boss 30B, thereby fastening the front case 32 and the rear case 34 together. In FIG. 11, only one first fixing screw 36 is shown.
[0044] A plurality of case-side air intake ports 30E (see FIGS. 2 and 6 ) are formed through the left walls of the front case 32 and the rear case 34. The case-side air intake ports 30E are elongated holes with the longitudinal direction extending in the front-to-rear direction and are arranged in a line in the vertical direction. A plurality of ribs 30F (see FIGS. 3 , 8 , 9A, and 10B ) are formed on the inner peripheral surfaces of the front case 32 and the rear case 34 (i.e., the inner peripheral surfaces of the motor accommodating portion 30A). The ribs 30F extend circumferentially around the motor case 30 and are spaced apart at predetermined intervals in the left-to-right direction. The ribs 30F sandwich the stator 52C of the motor 52 from both front-to-rear directions, thereby holding the stator 52C within the motor case 30.
[0045] A pair of upper and lower second fixing bosses 30G (see FIGS. 9 and 10 ) are formed on the first rib 30F from the right. The second fixing bosses 30G are generally cylindrical with their axial direction aligned in the left-right direction and protrude to the right from the rib 30F. Second fixing screws 38 are inserted into the second fixing bosses 30G from the left side and threadedly engage with the support portions 24A of the saw cover 24, thereby fastening the motor case 30 to the support portions 24A of the saw cover 24. The outer peripheries of the front case 32 and the rear case 34 are formed with recesses 30H (see FIGS. 2 , 4 , and 6 ) extending in the left-right direction at positions corresponding to the second fixing bosses 30G. The recesses 30H are open to the left and outward in the front-rear direction. The recesses 30H function as recesses when the second fixing screws 38 are moved left-right to fasten the motor case 30. Only two second fixing screws 38 are shown in FIG. 11 .
[0046] A partition wall 30J (see FIGS. 3, 9, and 10) is formed on the inner peripheral surfaces of the front case 32 and the rear case 34 at their rear end portions. The partition wall 30J extends circumferentially of the motor case 30, with the thickness direction being the left-right direction, and is located between the first and second ribs 30F counting from the right. The partition wall 30J is disposed radially outward of the motor shaft 52A and in close proximity to the left side of the fan 66. The partition wall 30J functions as a fan guide, which allows the location of negative pressure to be centered on the fan 66. When the fan 66 rotates, an airflow AR is generated that flows into the motor housing portion 30A from the case-side air intake 30E of the motor case 30. The airflow AR flows to the right within the motor housing portion 30A and enters the fan 66 from the inner peripheral portion of the partition wall 30J.
[0047] The motor case 30 is provided with a controller holder 30K that holds a controller 80 (described later). Specifically, a controller holder 30K is provided at the front-rear middle of the outer ends of the top walls of the front and rear cases 32 and 34. The controller holder 30K is formed on the upper side of the motor case 30 and extends in the left-right direction. The space sandwiched between the pair of controller holders 30K (the space sandwiched between the front controller holder 30K and the rear controller holder 30K in the front-rear direction) constitutes the controller housing 30L. Thus, the upper wall of the motor case 30 constitutes a partition wall 30M that separates the motor housing 30A from the controller housing 30L. The controller holder 30K is configured to protrude upward from the partition wall 30M.
[0048] A mating recess 30N is formed in the controller holder 30K. The mating recess 30N is recessed and opens inward in the front-to-rear direction (toward the motor housing 30A) and extends along the longitudinal direction of the controller holder 30K. The mating recess 30N is spaced apart from the upper side of the partition wall 30M. A central portion in the left-to-right direction of the underside of the mating recess 30N is cut out to open downward. A notch 30P is also formed in the top wall of the controller holder 30K, which opens the top wall of the mating recess 30N upward except for both left-to-right ends. In other words, the housing for the controller 80 in the motor case 30 is open upward.
[0049] An engagement groove 30Q (see FIGS. 5 and 6 ) is formed in the left end of the outer periphery of the controller holder 30K. The engagement groove 30Q is open outward in the front-to-rear direction and extends in the left-to-right direction, with the left end of the engagement groove 30Q opening to the left. A substantially rectangular air vent 30R (see FIGS. 3 and 7 ) is formed in the approximate center of the partition wall 30M, connecting the controller housing 30L and the motor housing 30A. The air vent 30R is positioned to straddle the front case 32 and the rear case 34. That is, the front portion of the air vent 30R is formed in the front case 32, and the rear portion of the air vent 30R is formed in the rear case 34.
[0050] A first wiring hole 30S (see FIGS. 7 and 8 ) is formed through the upper wall (compartment wall 30M) of the motor case 30 on the left side of the controller housing section 30L. The first wiring hole 30S connects the interior and exterior of the motor housing section 30A. The first wiring hole 30S is formed as an elongated hole with its longitudinal direction extending in the front-to-rear direction (the direction in which the motor case 30 is divided). The first wiring hole 30S is disposed so as to straddle the front case 32 and the rear case 34. That is, the front portion of the first wiring hole 30S is formed in the front case 32, and the first wiring hole 30S formed in the front case 32 is open to the rear (one side in the division direction). The rear portion of the first wiring hole 30S is formed in the rear case 34, and the first wiring hole 30S formed in the rear case 34 is open to the front (the other side in the division direction). The length in the front-rear direction of the first wiring hole 30S formed in the front case 32 is set to be longer than the length in the front-rear direction of the first wiring hole 30S formed in the rear case 34.
[0051] A second wiring hole 30T (see FIGS. 7 and 8 ) penetrates the upper wall of the motor case 30 between the first wiring hole 30S and the controller housing portion 30L, and the second wiring hole 30T connects the interior and exterior of the motor housing portion 30A. The second wiring hole 30T is formed as an elongated hole with its longitudinal direction extending in the front-to-rear direction, and the rear surface of the second wiring hole 30T is defined by the open end surface of the rear case 34. That is, the front case 32 is formed with the second wiring hole 30T that is open to the rear, and when the front case 32 and the rear case 34 are assembled together, the rear end of the second wiring hole 30T is blocked by the rear case 34, forming a closed second wiring hole 30T.
[0052] The first wiring hole 30S and the second wiring hole 30T are located to the left of the sensor board 58 of the motor 52. Specifically, the first wiring hole 30S is located to the left of the relay element 60 provided on the sensor board 58. Furthermore, when viewed from the left side, the first wiring hole 30S and the second wiring hole 30T are located radially outward (upper side) of the line processing region 58A of the sensor board 58 (see FIG. 4).
[0053] The power supply lines 62U, 62V, and 62W extend to the left from the sensor substrate 58, bend upward, and pass through the first wiring hole 30S. Specifically, when viewed from the left, the power supply lines 62U and 62W extending to the left from the sensor substrate 58 are routed toward the line processing region 58A along the outer periphery of the sensor substrate 58, bend upward in the line processing region 58A, and routed into the first wiring hole 30S (see FIG. 4). The power supply line 62V extending to the left from the sensor substrate 58 is bent upward in the line processing region 58A and routed into the first wiring hole 30S (see FIG. 4). The wire diameters of the power supply lines 62U, 62V, and 62W are approximately the same as the width (left-right dimension) of the first wiring hole 30S. Therefore, when the power lines 62U, 62V, and 62W are routed (inserted) into the first wiring hole 30S, the power lines 62U, 62V, and 62W are held by the first wiring hole 30S so that the movement of the power lines 62U, 62V, and 62W is restricted.
[0054] Furthermore, the signal line 64 extending to the left from the line processing region 58A of the sensor substrate 58 is bent upward and routed within the second wiring hole 30T. The diameter of the signal line 64 is approximately the same as the width (dimension in the left-right direction) of the second wiring hole 30T. Therefore, when the signal line 64 is routed (inserted) in the second wiring hole 30T, the signal line 64 is held by the second wiring hole 30T so that movement of the signal line 64 is restricted.
[0055] (Regarding the controller 80) The controller 80 includes a controller board 82 and a board holder 84. The board holder 84 is made of metal and is formed in the shape of a generally rectangular box that is open upward and has a relatively shallow bottom, with the left-right direction as its longitudinal direction. The controller board 82 is formed in the shape of a generally rectangular plate, with the plate thickness direction in the up-down direction and the left-right direction as its longitudinal direction. The controller board 82 is housed within and held by the board holder 84. The controller board 82 is equipped with circuits required for driving and controlling the motor 52, such as an inverter circuit and a microcomputer for controlling the inverter circuit.
[0056] The board holder 84 is sandwiched from the outside in the front-rear direction by a pair of front and rear controller holding portions 30K, and the controller 80 is held in the motor case 30. Specifically, both front-rear end portions of the board holder 84 are fitted into the fitting recesses 30N, and the controller 80 is housed in the controller accommodating portion 30L. In this way, the controller 80 is held in the motor case 30 outside the motor accommodating portion 30A in the motor case 30 and on the radially outer side (upper side) of the motor 52.
[0057] When the controller 80 is held in the motor case 30, the controller 80 is positioned radially outward (above) the stator 52C of the motor 52 and tilts slightly upward toward the right when viewed from the front-to-rear direction. Most of the top surface of the controller board 82 is exposed upward. Furthermore, the controller 80 is positioned above the partition wall 30M with a predetermined gap. As a result, when the controller 80 is held in the motor case 30, the space below the controller 80 in the controller accommodating section 30L is open to the front. In plan view, the air vent 30R in the partition wall 30M is positioned to overlap approximately the center of the controller 80. Furthermore, in plan view, the first wiring hole 30S and the second wiring hole 30T are positioned to the left of the controller 80, and the controller 80 is offset from the first wiring hole 30S and the second wiring hole 30T in the left-to-right direction.
[0058] As described above, a microcomputer (not shown) is provided on the controller board 82. Furthermore, the power supply lines 62U, 62V, and 62W extending from the first wiring hole 30S to the outside of the motor accommodating portion 30A are connected to the upper surface of the controller board 82, and the signal line 64 extending from the second wiring hole 30T to the outside of the motor accommodating portion 30A is connected to the upper surface of the controller board 82. Specifically, the power supply lines 62U, 62V, and 62W and the signal line 64 are bent to the right on the left side of the controller 80 and connected to the controller board 82. The power supply lines 62U, 62V, and 62W are each connected to an inverter circuit.
[0059] 1 to 5, the controller cover portion 26A is formed in the shape of a generally rectangular box with a relatively shallow bottom that is open downward and whose longitudinal direction is the left-right direction. Specifically, the controller cover portion 26A includes an upper cover wall 26A1 that is a generally rectangular plate with its thickness direction in the up-down direction, a front cover wall 26A2 that extends downward from the front end of the upper cover wall 26A1, a rear cover wall 26A3 that extends downward from the rear end of the upper cover wall 26A1, a left cover wall 26A4 that extends downward from the left end of the upper cover wall 26A1, and a right cover wall 26A5 that extends downward from the right end of the upper cover wall 26A1.
[0060] Then, with the controller 80, power supply lines 62U, 62V, 62W, and signal line 64 housed within controller cover part 26A, controller cover part 26A is disposed above motor case 30. That is, controller cover part 26A and motor case 30 conceal the controller 80, power supply lines 62U, 62V, 62W, signal line 64, first wiring hole 30S, and second wiring hole 30T so that they are not visible. The lower opening of controller cover part 26A is disposed adjacent to the upper side of motor case 30 so that it is blocked by the upper surface of motor case 30.
[0061] A pair of front and rear air intakes, cover-side air intakes 26A6 (see FIG. 2), are formed at the lower end of the left cover wall 26A4. The cover-side air intakes 26A6 are formed as a generally elongated hole with the longitudinal direction extending in the front-to-rear direction. The cover-side air intake 26A6 is located on the left side of the controller 80. As a result, when the fan 66 rotates, an airflow AR is generated that flows into the controller cover portion 26A from the cover-side air intake 26A6. The airflow AR then flows into the controller housing portion 30L, flows to the right in the space below the controller 80, and flows into the motor housing portion 30A through the air vent 30R (see FIG. 3).
[0062] Additionally, engagement rails 26A7 (see FIG. 5 ) are provided at the lower ends of the front cover wall 26A2 and the rear cover wall 26A3 as mounting portions. The engagement rails 26A7 are formed in a generally rectangular plate shape with the thickness direction in the up-down direction and the length direction in the left-right direction, and protrude inward in the front-to-rear direction from the lower ends of the front cover wall 26A2 and the rear cover wall 26A3. The engagement rails 26A7 are inserted into the engagement grooves 30Q of the motor case 30 from the left side, and the engagement rails 26A7 and the engagement grooves 30Q engage with each other in the up-down direction. When the engagement rails 26A7 are inserted into the engagement grooves 30Q, the front engagement rails 26A7 restrict forward movement of the front case 32, and the rear engagement rails 26A7 restrict rearward movement of the rear case 34. Furthermore, the engagement rails 26A7 are positioned below the controller 80.
[0063] A sub-handle 26D (see FIGS. 1 and 2) is integrally provided with the front cover wall 26A2. The sub-handle 26D is formed in a generally T-shape in plan view and extends forward from the front cover wall 26A2, with the front end of the sub-handle 26D protruding outward in the left-right direction. That is, as shown in FIG. 11, the left housing member 28 is formed as a single component and includes the controller cover portion 26A and the sub-handle 26D. Furthermore, the left housing member 28 also functions as an element constituting the battery holder portion 26B.
[0064] (Operation and Effect) Next, the operation and effect of this embodiment will be described.
[0065] In the circular saw 10 configured as described above, the motor 52 is housed in the motor housing portion 30A of the motor case 30, and the controller 80 that controls the motor 52 is held in the motor case 30 outside the motor housing portion 30A. The motor 52 and the controller 80 are connected by power lines 62U, 62V, and 62W and a signal line 64. When the operator operates the trigger 42, the driving force of the motor 52 rotates the spindle 68 together with the circular saw blade 14. This causes the workpiece to be cut.
[0066] Here, the motor case 30 is formed with a first wiring hole 30S and a second wiring hole 30T that communicate between the interior and exterior of the motor accommodating section 30A. The power supply lines 62U, 62V, and 62W are routed while being held in the first wiring hole 30S, and the signal line 64 is routed while being held in the second wiring hole 30T. The motor case 30 is also composed of a front case 32 and a rear case 34 that are divided into two in the front-to-rear direction, and the first wiring hole 30S and the second wiring hole 30T are formed by assembling the front case 32 and the rear case 34 together. This prevents deterioration of workability when assembling the motor 52 and the controller 80 to the motor case 30.
[0067] That is, when assembling the motor 52 and the controller 80 to the motor case 30, first, the power supply lines 62U, 62V, 62W and the signal lines 64 are inserted and routed through the first wiring holes 30S and the second wiring holes 30T of the disassembled front case 32 and rear case 34, thereby holding the power supply lines 62U, 62V, 62W and the signal lines 64 in the front case 32 and rear case 34. Then, the motor 52 and the controller 80 are assembled to the motor case 30 by sandwiching them in the front-to-rear direction between the front case 32 and the rear case 34 holding the power supply lines 62U, 62V, 62W and the signal lines 64. Furthermore, after the front case 32 and the rear case 34 are assembled together, the first wiring hole 30S and the second wiring hole 30T are closed, preventing the power lines 62U, 62V, and 62W from falling out of the first wiring hole 30S and the signal line 64 from falling out of the second wiring hole 30T. That is, with the circular saw 10 of this embodiment, the power lines 62U, 62V, and 62W and the signal line 64 can be positioned while the motor 52 is housed inside the motor housing portion 30A of the motor case 30 and the controller 80 can be held in the motor case 30 outside the motor housing portion 30A. This prevents the circular saw 10 from being easily assembled.
[0068] The handle housing 26 of the housing 22 is provided with a controller cover 26A. The controller 80 is held in the motor case 30 radially outward (above) of the motor 52, and the controller 80, power lines 62U, 62V, 62W, and signal lines 64 are hidden and concealed by the motor case 30 and the controller cover 26A. This ensures that the controller cover 26A and the motor case 30 protect the controller 80, which is located outside the motor accommodating section 30A. Furthermore, because the power lines 62U, 62V, 62W, and signal lines 64 held by the motor case 30 are covered by the controller cover 26A (left housing member 28), workability when assembling the left housing member 28 to the right housing member 27 is reduced. This reduces the ease of assembly of the circular saw 10.
[0069] Furthermore, with the top surface of the controller board 82 open upward, the controller 80 is held in the motor case 30 and is covered from above by the controller cover part 26A. Therefore, the power supply lines 62U, 62V, 62W and the signal lines 64 connected to the top surface of the controller board 82 can be easily routed above the controller board 82. Furthermore, after the power supply lines 62U, 62V, 62W and the signal lines 64 have been routed, the controller board 82 can be covered by the controller cover part 26A so that it cannot be seen.
[0070] Furthermore, in plan view, the first wiring hole 30S and the second wiring hole 30T are positioned to the left of the controller 80. Therefore, compared to a configuration in which the first wiring hole 30S and the second wiring hole 30T are positioned so that they overlap the controller 80 in plan view, interference between the power supply lines 62U, 62V, 62W and the signal line 64 and the controller 80 can be reduced when assembling the controller 80 to the motor case 30. This further reduces deterioration in workability when assembling the controller 80 to the motor case 30 and also reduces damage to the power supply lines 62U, 62V, 62W and the signal line 64.
[0071] Furthermore, a plurality of (three in this embodiment) power lines 62U, 62V, 62W are routed through the first wiring hole 30S, and a plurality of (nine in this embodiment) signal lines 64 are routed through the second wiring hole 30T. This allows the first wiring hole 30S and the second wiring hole 30T to bundle the plurality of power lines 62U, 62V, 62W and the signal lines 64 together on the left side of the controller 80, and to extend from the motor case 30 to the outside of the motor accommodating section 30A. This allows for space savings in the arrangement area for the power lines 62U, 62V, 62W and the signal lines 64.
[0072] The housing 22 also includes a handle housing 26 having a handle portion 26C, and the controller cover portion 26A forms part of the handle housing 26. This allows the handle housing 26 having the handle portion 26C to be used to cover the controller 80 exposed outside the motor accommodating portion 30A. From another perspective, at least one or both of the handle portion 26C and the controller cover portion 26A are formed on a single component (the left housing member 28) that constitutes the battery holder portion 26B. This allows the controller 80 to be concealed and hidden while minimizing the number of components. The handle housing 26 having the handle portion 26C can also be used to cover the first wiring hole 30S and the second wiring hole 30T.
[0073] Furthermore, the controller 80 is disposed above the motor 52, and the controller cover part 26A is located above the motor case 30, covering the controller 80 from above, both front-rear and left-right. Furthermore, the controller cover part 26A has an engagement rail 26A7 that is assembled to the motor case 30, and the engagement rail 26A7 is located below the controller 80. As a result, for example, if the controller cover part 26A becomes wet, the liquid will flow along the controller cover part 26A and drop from the controller cover part 26A at a position below the controller 80. This improves the waterproofing of the controller 80.
[0074] The controller cover 26A is provided with a pair of front and rear engagement rails 26A7, and the motor case 30 is formed with engagement grooves 30Q into which the engagement rails 26A7 are inserted. When the engagement rails 26A7 are inserted into the engagement grooves 30Q, the pair of front and rear engagement rails 26A7 restrict outward movement of the front case 32 and the rear case 34 in the front-to-rear direction. Therefore, even if the front case 32 and the rear case 34 are disassembled, the pair of engagement rails 26A7 can prevent the front case 32 and the rear case 34 from disassembling. This allows the front case 32 and the rear case 34 to be well-assembled. This feature also improves the fastening force between the front case 32 and the rear case 34, thereby eliminating the need for screws for fastening.
[0075] The engagement groove 30Q is formed as a groove that is open outward in the front-rear direction and to the left, and the engagement rail 26A7 of the controller cover 26A is inserted into the engagement groove 30Q from the left side, and the engagement groove 30Q and the engagement rail 26A7 engage in the vertical direction. This allows the vertical position of the right housing member 27 to be determined by the engagement rail 26A7 when the left housing member 28 is assembled to the right housing member 27. This further prevents deterioration in the ease of assembly of the circular saw 10.
[0076] Furthermore, the first wiring hole 30S and the second wiring hole 30T are located on the left side of the controller 80, and the handle portion 26C is located on the right side of the controller 80. This allows the controller 80 to be located closer to the handle portion 26C in the left-right direction compared to a configuration in which the first wiring hole 30S and the second wiring hole 30T are located on the right side of the controller 80. Therefore, the circular saw 10 can be well balanced in the left-right direction when the handle portion 26C is gripped.
[0077] Furthermore, the sensor board 58 is disposed on the left side of the stator 52C, and the handle 26C is disposed on the right side of the stator 52C. This allows the stator 52C and the rotor 52B to be positioned closer to the handle 26C in the left-right direction than in a configuration in which the sensor board 58 is disposed on the right side of the stator 52C. This allows the circular saw 10 to be well balanced in the left-right direction when the handle 26C is gripped.
[0078] The controller 80 is located radially outward from the motor 52, with the first wiring hole 30S and the second wiring hole 30T disposed on the left side of the controller 80 (or the stator 52C). The power supply lines 62U, 62V, 62W and the signal line 64 extend leftward from the sensor board 58 of the motor 52, pass through the first wiring hole 30S and the second wiring hole 30T, and extend from the first wiring hole 30S and the second wiring hole 30T to the outside of the motor accommodating portion 30A to be connected to the controller 80. This allows the lengths of the power supply lines 62U, 62V, 62W and the signal line 64 to be set short. That is, if the first wiring hole 30S and the second wiring hole 30T were positioned on the right side of the controller 80 (or the stator 52C), the power supply lines 62U, 62V, 62W and the signal lines 64 would need to be routed to the right once radially outside the motor 52, increasing the lengths of the power supply lines 62U, 62V, 62W and the signal lines 64. In contrast, by positioning the first wiring hole 30S and the second wiring hole 30T on the extension direction side of the power supply lines 62U, 62V, 62W and the signal lines 64, the motor 52 and the controller 80 can be connected while shortening the lengths of the motor lines (power supply lines 62U, 62V, 62W and the signal lines 64) extending from the sensor board 58 to the left side.
[0079] The motor case 30 is formed in a cylindrical shape with a bottom that is open to the right, and has wiring holes (first wiring hole 30S and second wiring hole 30T) for passing wiring through the left area of the upper wall (compartment wall 30M). This allows the power lines 62U, 62V, 62W and the signal line 64 to be drawn from the left wall (bottom wall) side of the motor case 30 to the outside of the motor accommodating section 30A and connected to the controller 80.
[0080] Additionally, a controller holding portion 30K is provided on the outer periphery of the motor case 30, and the controller holding portion 30K holds the controller 80 in the front-to-rear direction. That is, by providing a controller holding portion 30K on each of the front case 32 and the rear case 34, the controller 80 can be held in the front-to-rear direction by the controller holding portions 30K when assembling the motor case 30. This allows the controller 80 to be held with a simple configuration.
[0081] The motor case 30 is formed with an air vent 30R that exposes the controller 80 to the motor housing 30A, and the controller cover 26A is formed with a cover-side air intake 26A6. A fan 66 is provided on the motor 52 so as to rotate integrally with the motor. When the fan 66 rotates, an airflow AR is generated that flows into the controller cover 26A through the cover-side air intake 26A6. The airflow AR passes through the space below the controller 80 and flows into the motor housing 30A through the air vent 30R. This allows the controller 80, located outside the motor housing 30A, to be cooled by the airflow AR generated by the fan 66 housed inside the motor housing 30A. This ensures proper cooling of the controller 80 located outside the motor housing 30A.
[0082] In this embodiment, the motor case 30 is configured with a front case 32 and a rear case 34 that are divided in two in the front-rear direction. However, the motor case 30 may be configured as a single, indivisible member. In this case, the first wiring holes 30S and the second wiring holes 30T extending in the left-right direction are formed in the partition wall 30M of the motor case 30. The motor case 30 may also be configured with two cases divided in the axial direction (left-right direction). Furthermore, the right ends of the first wiring holes 30S and the second wiring holes 30T are open to the right, and the extension lengths of the first wiring holes 30S and the second wiring holes 30T are set so that the left ends of the first wiring holes 30S and the second wiring holes 30T are located to the left of the controller 80. In other words, the first wiring holes 30S and the second wiring holes 30T are configured as notches that continue from the right end of the motor case 30, with a portion of the notch located to the left of the controller 80 (or the stator 52C). In other words, a space that can be used as a wiring area, connecting the inside and outside of the motor housing portion 30A, is configured to be located to the left of the controller 80 (or stator 52C). Furthermore, the controller holder 30K is configured to hold the controller 80 that is assembled (inserted) from the right side. This allows the motor 52, which is assembled from the right side, to be housed in the motor housing portion 30A while the power supply lines 62U, 62V, and 62W are inserted into the first wiring hole 30S from the right side and the signal line 64 is inserted into the second wiring hole 30T, and the controller 80, which is assembled from the right side, is then held by the controller holder 30K. In this case, the power supply lines 62U, 62V, and 62W are positioned by the first wiring hole 30S, and the signal line 64 is positioned by the second wiring hole 30T, thereby improving the ease of assembly of the circular saw 10, as in the present embodiment.
[0083] 10...Circular saw (working machine), 22...Housing, 26...Handle housing, 26A...Controller cover portion, 26A6...Cover side air intake (air intake), 26A7...Engagement rail (assembly portion), 26C...Handle portion (grip portion), 30...Motor case, 30A...Motor accommodating portion, 30K...Controller holding portion, 30Q...Engagement groove portion (groove portion), 30R...Ventilation hole, 30S...First wiring hole (wiring hole), 30T...Second wiring hole (wiring hole), 32...front case (first case), 34...rear case (second case), 52...motor, 52B...rotor, 52C...stator, 58...sensor board, 62U...power line (motor line), 62V...power line (motor line), 62W...power line (motor line), 64...signal line (motor line), 66...fan, 68...spindle (actuating part), 80...controller, 82...controller board, AR...air flow
Claims
1. A motor having a stator and a rotor, An operating part that operates by the drive of the motor, A housing that supports the motor and the operating part, A controller that controls the motor, A motor wire connecting the motor and the controller, Equipped with, The housing comprises a motor case having a motor housing portion for housing the motor, and the controller is held in the motor case such that at least a portion of it is exposed outside the motor housing portion. The motor case has a wiring hole that connects the inside and outside of the motor housing, and the motor wires are routed through the wiring hole. The motor case is composed of a divided first case and a second case, and the wiring holes are formed by assembling the first case and the second case together. The housing has a controller cover portion that is separate from the motor case, and the controller and motor wires held in the motor case are covered by the controller cover portion.
2. The controller is held in the motor case on the radially outer side of the motor, The work machine according to claim 1, wherein the controller and the motor wires are covered so as not to be visible by the motor case and the controller cover.
3. The controller has a controller board on one side to which the motor wires are connected. The work machine according to claim 2, wherein the controller is held in the motor case and covered from the radially outward by the controller cover, with at least a portion of one side of the controller board open to the radially outward side.
4. The work machine according to claim 1, wherein, when viewed from the radially outer side of the motor, the wiring hole is positioned on one side in the axial direction of the motor relative to the controller.
5. The housing is configured to include a handle housing having a gripping portion for the operator to grasp, The work machine according to claim 1, wherein the controller cover portion constitutes a part of the handle housing.
6. The controller is positioned above the motor, and the controller cover covers the controller from above, both front-to-back and both left-to-right directions, on the upper side of the motor case. The work machine according to claim 1, wherein the controller cover portion has an assembly portion that is assembled to the motor case, and the assembly portion is located below the controller.
7. The motor is positioned with its axial direction perpendicular to the vertical direction. The motor case is divided in a direction perpendicular to the vertical direction, The work machine according to claim 6, wherein the controller cover portion has the assembly portion, and the assembly portion restricts the first case and the second case from separating in the direction of division of the motor case.
8. The motor case is composed of a first case and a second case that are divided in the radial direction of the motor. A pair of grooves are formed on the outer circumference of the motor case, opening outwards in the direction of division of the motor case and on one side in the axial direction. The work machine according to claim 7, wherein the assembly portion is inserted into the groove portion from one side in the axial direction, and the assembly portion and the groove portion are engaged in the vertical direction.
9. The wiring hole is located on one side of the motor in the axial direction relative to the controller. The work machine according to claim 5, wherein the gripping portion is located on the other side in the axial direction relative to the controller.
10. The motor has a sensor board to which the motor wires are connected. The sensor substrate is positioned on one side of the motor in the axial direction relative to the stator. The gripping portion is located on the other side in the axial direction relative to the stator, The work machine according to claim 5, wherein the wiring hole is located on one side in the axial direction with respect to the sensor substrate.
11. The controller is located radially outward from the motor, The wiring hole is located on one side of the motor in the axial direction relative to the controller, and the operating part is located on the other side of the stator in the axial direction. The work machine according to claim 1, wherein the motor wire extends from the motor to one side in the axial direction.
12. The motor case is formed in a bottomed cylindrical shape that is open to the other side in the axial direction, according to claim 11.
13. A motor having a stator and a rotor, An operating part that operates by the drive of the motor, A housing that supports the motor and the operating part, A controller that controls the motor, A motor wire connecting the motor and the controller, Equipped with, The housing is configured to include a motor case having a motor housing portion for housing the motor, The motor case has a wiring hole formed therein that connects the inside and outside of the motor housing. The motor case is composed of a divided first case and a second case, and the wiring holes are formed by assembling the first case and the second case together. A controller holder portion for holding the controller is provided on the outer circumference of the motor case. The controller holding portion is a work machine that clamps the controller in the direction of division of the motor case.
14. The work machine according to claim 13, wherein the motor case is composed of a first case and a second case divided in the radial direction of the motor.
15. A motor having a stator and a rotor, A motor wire extending from the motor to one side in the axial direction of the motor, An operating part is positioned on the other side in the axial direction relative to the stator and is operated by the drive of the motor, A housing that supports the motor and the operating part, The motor is electrically connected to the motor via the aforementioned motor wires, and a controller is provided to control the motor. Equipped with, The housing is configured to include a motor case having a motor housing portion for housing the motor, and the controller is held in the motor case outside the motor housing portion. The motor case has a wiring hole located on one side in the axial direction relative to the stator, and the wiring hole is formed by assembling the divided first case and second case together. A work machine in which the motor wires extending from the motor are routed from the inside to the outside of the motor housing through the wiring hole and connected to the controller.