Work machine

Abstract

The invention provides a working machine with a good lighting device. In the grinding machine (10), lighting devices (80) are arranged on the left side and the right side of the rear end portion of a gear box (27) and arranged on the upper side of a wheel cover (76). Specifically, the holder (84) of the lighting device (80) can be visually exposed from the outer periphery of the gearbox (27), and the holder (84) can be visually disposed when viewed from the front. Furthermore, when the LED (81) of the lighting device (80) emits light by the operation of the operator on the operation part (60), the periphery of the lower part of the main shaft (71) (i.e., the grinding stone (75)) is illuminated by the emitted light. Namely, light irradiated to the grindstone (75) from the illumination devices (80) provided on both sides of the housing (20) is not blocked by the housing (20), and the grindstone (75) disposed around the lower portion of the spindle (71) can be illuminated by the light. Therefore, the lower part (namely, the grinding stone (75)) of the main shaft (71) can be well illuminated.

Description

Technical Field

[0001] The invention relates to a working machine. Background Art

[0002] In the grinding machine (working machine) described in the following patent document 1, a motor is housed inside a motor housing extending in the front-rear direction, and a spindle is housed inside a gear box arranged on the front side of the motor housing. A front end tool such as a grindstone is mounted on the lower end of the spindle, and a part of the front end tool is covered by a wheel cover. When the motor is driven, the grindstone rotates together with the spindle, thereby performing grinding processing on the workpiece.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-160045 Summary of the invention

[0006] Technical issues

[0007] Here, in a working machine such as the above-mentioned grinder, by illuminating the periphery of the lower part of the main shaft (front end tool) with a lighting device, the operability can be improved. However, a working machine such as the above-mentioned grinder is sometimes placed on a flat surface such as the ground, and depending on the location of the lighting device, there is a concern that the lighting device may be damaged or deformed by the ground. In addition, in a working machine such as the above-mentioned grinder, depending on the location of the lighting device, the main shaft or the wheel cover blocks the light, making it difficult to illuminate the periphery of the lower part of the main shaft. Therefore, it is preferred that the working machine has a good lighting device.

[0008] In view of the above facts, an object of the present invention is to provide a working machine having an excellent lighting device.

[0009] Technical Solution

[0010] According to one or more embodiments of the present invention, a working machine comprises: a motor that rotates with a forward and backward direction as an axis; a housing that has a motor housing that accommodates the motor and a gear box arranged on the front side of the motor housing; a main shaft that is supported by the gear box, extends in the up-down direction, is rotated by the driving force of the motor, and has a circular plate-shaped front end tool that can be detachably mounted at the lower part; a cover member that is mounted on the gear box and covers at least a portion of the front end tool; and a lighting device, at least a portion of which is arranged on the upper side of the cover member and on at least one of the left and right sides of the housing, and extends from the inside of the motor housing to irradiate light toward the surrounding area of ​​the lower part of the main shaft through the outside of the gear box.

[0011] According to one or more embodiments of the present invention, a working machine comprises: a motor that rotates with the axis in the forward and backward direction as the axis; a housing that has a motor housing that accommodates the motor and a gear box arranged on the front side of the motor housing; a main shaft that is supported by the gear box, extends in the up-down direction, is rotated by the driving force of the motor, and has a circular plate-shaped front end tool that can be detachably mounted at the lower part; a cover member that is mounted on the gear box and covers at least a portion of the front end tool; and a lighting device that is arranged on the lower side compared to the axis of the motor and illuminates the surroundings of the lower part of the main shaft, at least a portion of the lighting device is arranged on the upper side of the cover member and on at least one of the left and right sides of the housing, and when viewed from the front side of the housing, the lighting device can be visually identified through a space formed by an opening facing forward or a recessed portion facing left and right directions provided in the housing.

[0012] According to one or more embodiments of the present invention, the working machine includes a protection mechanism that suppresses contact between a flat surface such as the ground or a floor and the lighting device when the flat surface and the lighting device are brought closer to each other in the left-right direction.

[0013] According to the working machine of one or more embodiments of the present invention, the lighting device is configured to be visually recognizable even when viewed from the front, and the protection mechanism is configured to protrude to the outside of the casing more than the lighting device.

[0014] According to the working machine of one or more embodiments of the present invention, the protection mechanism includes: a front side protection portion, which is arranged adjacent to the front side of the lighting device; and a rear side protection portion, which is arranged on the rear side of the lighting device, and when viewed from the front side of the outer shell, a portion of the lighting device is arranged adjacent to the lower side of the front side protection portion.

[0015] According to the working machine of one or more embodiments of the present invention, the lighting device is located above the tool end and behind and outside in the left-right direction relative to the main shaft.

[0016] According to the working machine of one or more embodiments of the present invention, the lighting device is exposed so as to be visible from outer peripheral portions of left and right side portions of the gear case.

[0017] According to the working machine of one or more embodiments of the present invention, the lighting device includes: a light-emitting portion having a light source; and a retainer that retains the light-emitting portion, the rear portion of the retainer is connected to the motor housing or an internal component accommodated in the motor housing, and the front portion of the retainer is connected to the gear box.

[0018] According to the working machine of one or more embodiments of the present invention, the rear portion of the retainer is assembled to the inner component, the inner component is assembled to the motor, and the retainer is sandwiched between the gear box and the motor housing in the front-rear direction.

[0019] According to one or more embodiments of the present invention, a working machine comprises: a first housing, which extends in the front-to-back direction, has an opening portion open to the front side at the front end portion, and accommodates a motor; a second housing, which is arranged on the front side of the first housing, supports and holds the main shaft of the front end tool, and is connected to the first housing in a manner covering the opening portion; and a lighting device, a portion of which is located in the first housing, and another portion extends from the opening portion to the front side and irradiates light to the surroundings of the front end tool, at least a portion of the opening portion is covered by the second housing, and at least a portion of the portion not covered by the second housing is covered by the lighting device.

[0020] According to the working machine of one or more embodiments of the present invention, the lighting device includes: a light-emitting unit having a light source; and a connecting unit connecting a power supply unit that supplies power to the light source and the light source, and the light-emitting unit is arranged outside the first housing.

[0021] According to the working machine of one or more embodiments of the present invention, the lighting device includes a holder that holds the light emitting portion and the connecting portion, and the holder holds the light emitting portion at a position forward of the main shaft.

[0022] According to the working machine of one or more embodiments of the present invention, the retainer is configured to surround the main shaft, and includes a first retaining portion for retaining the light-emitting portion and the connecting portion, and a second retaining portion for retaining the connecting portion, the rear portion of the second retaining portion being accommodated inside the first outer shell, the front portion of the second retaining portion protruding from the opening portion toward the front side, and being clamped between the first outer shell and the second outer shell in the front-to-back direction.

[0023] According to the working machine of one or more embodiments of the present invention, the first holding portion is arranged radially outside the main shaft and above the front end tool relative to the lower end of the second housing, and when viewed from above, the light source overlaps with the second housing.

[0024] According to the working machine of one or more embodiments of the present invention, the second housing is composed of two or more divided components, and the first holding portion is fixed to the second housing by a fixing tool that fixes the divided components to each other.

[0025] Effects of the Invention

[0026] According to one or more embodiments of the present invention, a working machine having an excellent lighting device can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a side view which shows the disc grinder of 1st Embodiment seen from the left side.

[0028] Figure 2 It is shown Figure 1 The interior of a disc grinder is shown in a side sectional view from the left side.

[0029] Figure 3 Viewed from the front Figure 1 Front view of the disc grinder shown.

[0030] Figure 4 Observed from the top Figure 1 A plan view of the front of a disc grinder is shown.

[0031] Figure 5 The gearbox and fan guide are shown removed. Figure 1 The illustrated embodiment is a side view of a state of a holder of the lighting device as viewed from the left side.

[0032] Figure 6 Observed from the left front Figure 5 A perspective view of the retainer and fan guide shown.

[0033] Figure 7 Observed from the left rear Figure 5 A perspective view of the retainer, gear box, and fan guide is shown.

[0034] Figure 8 It is shown Figure 3 A cross-sectional view of the lighting device shown in FIG. 1 , which is assembled to the gear box and the fan guide, as viewed from the left side. Figure 3 (enlarged cross-sectional view of line 8-8).

[0035] Fig. 9 It is shown Figure 1 A diagram of the lighting device shown on the left.

[0036] Fig.10 It is shown Figure 1 A cross-sectional view of the left protective mechanism as viewed from above ( Figure 1 10-10 line cross-sectional view).

[0037] Fig.11 It is shown Figure 1 FIG. 1 is a diagram showing a first variation of the configuration of the lighting device.

[0038] Fig.12 It is shown Figure 1 FIG. 2 is a diagram showing a second variation of the configuration of the lighting device shown.

[0039] Fig.13 It is shown Figure 1 FIG. 3 is a diagram showing a third variation of the configuration of the lighting device shown.

[0040] Fig.14 It is shown Figure 1 A front view of a fourth variation of the configuration of the lighting device shown.

[0041] Fig.15 Observed from the left Fig.14 A side view of a fourth variation of the configuration of the lighting device shown.

[0042] Fig.16 This is a front view showing an enlarged lower portion of the front portion of the disc grinder according to the second embodiment.

[0043] Fig.17 Observed from the left Fig.16 A side view of the front of a disc grinder is shown.

[0044] Fig.18 It is shown Fig.16 A cross-sectional view of the lighting device shown in FIG. 1, which is fixed to the gear box and viewed from the bottom side ( Fig.16 18-18 line cross-sectional view).

[0045] Fig.19 It is shown Fig.16 A sectional view of the lighting device shown in FIG. 1, which is fixed to the gear box and viewed from the left side ( Fig.16 19-19 line cross-sectional view).

[0046] Fig. 20 The holder cover is shown removed from the light-transmitting holder. Fig.16 A perspective view of the lighting device shown is shown as viewed obliquely from the left front. DETAILED DESCRIPTION

[0047] (First Embodiment)

[0048] The following uses Figures 1 to 10 A disc grinder 10 (hereinafter referred to as the grinder 10) as a working machine of the first embodiment will be described. In addition, arrows UP, FR, and LH shown appropriately in the figure respectively represent the upper side, the front side, and the left side of the grinder 10. In the following description, when the up-down, front-back, and left-right directions are used for description, unless otherwise specified, the up-down direction, the front-back direction, and the left-right direction of the grinder 10 are referred to.

[0049] like Figure 1 to Figure 4As shown, the grinder 10 is configured as a tool for performing grinding processing on a workpiece using a grindstone 75 or the like as a front end tool. In addition, the grinder 10 has a pair of left and right lighting devices 80 for illuminating the periphery of the grindstone 75, and a protection mechanism 100 for protecting the lighting devices 80. Hereinafter, the overall structure of the grinder 10 will be described first, and then the lighting devices 80 and the protection mechanism 100 will be described.

[0050] (About the Overall Structure of the Grinding Machine 10)

[0051] like Figure 1 and Figure 2 As shown, the grinder 10 is generally formed in a substantially cylindrical shape extending in the front-rear direction, and the outer contour of the grinder 10 is constituted by a housing 20. The housing 20 includes a motor housing 21 constituting a middle portion of the housing 20 in the front-rear direction, a handle housing 22 constituting a rear portion of the housing 20, and a gear box 27 constituting a front end portion of the housing 20.

[0052] (Regarding the motor housing 21)

[0053] The motor housing 21 is made of resin and is formed into a substantially bottomed cylindrical shape that is open to the front side. The motor 30 is accommodated in the motor housing 21. The motor 30 is electrically connected to a controller 50 described later and is driven by the control of the controller 50. The motor 30 includes a rotating shaft 30A, a rotor 30B, and a stator 30C. The motor 30 is a brushless motor, and insulators made of resin are provided before and after the stator 30C.

[0054] The rotating shaft 30A is arranged with the front-to-back direction as the axial direction, and the rear end of the rotating shaft 30A 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 arranged in the gear box 27 described later, and the front end side portion of the rotating shaft 30A is rotatably supported by a second motor bearing 32 held in the gear box 27. The pinion 33 is fixed to the front end of the rotating shaft 30A. The rotor 30B is arranged on the radially outer side of the rotating shaft 30A, and is configured to be able to rotate integrally with the rotating shaft 30A. The stator 30C is formed into a substantially cylindrical shape with the front-to-back direction as the axial direction, and is supported on the motor housing 21 on the radially outer side of the rotor 30B.

[0055] At the front end side portion of the rotating shaft 30A, a fan 34 is provided so as to be integrally rotatable behind the second motor bearing 32. The fan 34 is configured as a centrifugal fan, and is configured so that the fan 34 generates an airflow from the rear side to the front side.

[0056] A fan guide 35 as an internal component 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 through the central portion of the bottom wall of the fan guide 35, and the rotating shaft 30A of the motor 30 is inserted into the insertion portion 35A. The fan guide 35 is assembled to the front end portion of the stator 30C of the motor 30, and is sandwiched between the gear box 27 and the motor 30 described later in the front-to-back direction. The fan guide 35 guides the airflow directed radially outward forward by the fan 34. The air guided forward by the fan guide 35 is discharged to the outside from the exhaust port 27C described later.

[0057] The front end of the motor housing 21 is formed with an expanded diameter portion 21A as an opening portion extending radially outward. The expanded diameter portion 21A is formed in a substantially rectangular shape when viewed from the front, and is formed in a substantially rectangular shape with the vertical direction as the longitudinal direction and open to the front side when viewed from the left side. In addition, a switch lever 40 is provided on the left side of the motor housing 21 (see Figure 1 The switch lever 40 is connected to the motor housing 21 so as to be slidable in the front-rear direction. Figure 1 The mobile phone slides between a closed position shown and an open position (not shown) in which the mobile phone slides forward from the closed position.

[0058] A switch holding portion 21B is integrally provided on the rear wall of the motor housing 21. The switch holding portion 21B protrudes from the motor housing 21 to the rear side and is formed into a roughly rectangular box shape that is open to the right. The switch 41 is held in the switch holding portion 21B. The switch 41 is electrically connected to the controller 50 described later. When the aforementioned switch lever 40 is operated from the closed position to the open position, the switch 41 is turned on and outputs an open signal to the controller 50. Specifically, the slide bar 42 is connected to the switch lever 40, and when the switch lever 40 slides, the slide bar 42 presses the switch 41. As a result, the switch 41 is turned on, and is configured so that the motor 30 is driven by the controller 50. In addition, the slide bar 42 extends in the front-to-back direction within the housing 20, Figure 2 Only the rear end of the slide bar 42 is shown.

[0059] (About the handle housing 22)

[0060] The handle housing 22 is made of resin and is composed of a housing component divided into two parts in the left-right direction. And, the housing components of the handle housing 22 are fastened to each other in a state where the switch holding portion 21B is clamped from both sides in the left-right direction. Thus, the handle housing 22 is connected to the motor housing 21. The front portion of the handle housing 22 is configured as a handle portion 23 held by an operator, and the rear portion of the handle housing 22 is configured as a rear housing portion 24. The rear housing portion 24 extends to both sides in the upward and downward directions and both sides in the left-right direction compared to the handle portion 23. That is, the width dimension (left-right dimension) of the rear housing portion 24 is set to be larger than the width dimension of the handle portion 23.

[0061] When viewed from the left and right directions, the rear housing portion 24 extends in a direction that is inclined toward the rear side as it moves toward the upper side. In the following description, when viewed from the left and right directions, the extending direction of the rear housing portion 24 is referred to as an inclined direction (refer to Figure 1 and Figure 2 The direction perpendicular to the tilt direction is called the perpendicular direction (refer to Figure 1 and Figure 2 In addition, Figure 1 and Figure 2 The arrow S1 direction side is the inclined direction side, and Figure 1 and Figure 2 The side in the direction of arrow V1 is one side in the orthogonal direction.

[0062] A plurality of air inlets 24A are formed through the left and right side walls of the rear housing portion 24 (see Figure 1 ). The air inlet 24A is formed into a long hole with the inclined direction as the long side direction. In the rear housing portion 24, a pair of left and right filters 28 are detachably provided at positions corresponding to the air inlet 24A, and the filters 28 cover the air inlet 24A from the left and right outer sides. Thus, the filters 28 prevent foreign matter from entering the housing 20 from the air inlet 24A. In addition, most of the outer periphery of the handle housing 22 is covered with a rubber portion 25 (see Figure 1 The rubber portion 25 is covered with the handle housing 22 (the portion painted in gray). The rubber portion 25 is formed integrally with the handle housing 22.

[0063] The controller 50 is accommodated in the rear housing portion 24. The controller 50 includes a controller substrate 51 and a controller housing 52 that accommodates and holds the controller substrate 51. The controller housing 52 is formed into a box shape that is open to one side in the orthogonal direction and has a shallow bottom, and is clamped from the left and right sides by the handle housing 22. The controller substrate 51 is formed into a roughly rectangular plate shape with the orthogonal direction as the plate thickness direction, is arranged in the controller housing 52, and is held in the controller housing 52. The controller 50 is arranged between the left and right air inlets 24A. Thus, when the fan 34 rotates, an airflow is generated that flows from the air inlet 24A into the handle housing 22, and the airflow flows to the front side in the motor housing 21 through a hole portion (not shown) formed on the rear wall of the motor housing 21, and cools the controller 50 and the motor 30.

[0064] At the rear end portion of the rear housing portion 24, a battery mounting portion 24B for mounting the battery 44 is provided on the other side in the orthogonal direction of the controller 50. The battery mounting portion 24B extends in the tilting direction. The battery mounting portion 24B is formed into a concave shape that is open to one side in the tilting direction and the other side in the orthogonal direction. A terminal unit 45 connected to the battery 44 is provided in the battery mounting portion 24B, and the terminal unit 45 is assembled to the handle housing 22 by being clamped by the handle housing 22 from the outside in the left and right directions. The terminal unit 45 is electrically connected to the controller 50. In addition, the battery 44, which is configured as a power supply portion, is detachably mounted on the battery mounting portion 24B from one side in the tilting direction, and the power from the battery 44 is supplied to the controller 50 via the terminal unit 45.

[0065] At the upper end of the rear housing 24, a speed setting unit 46 is provided on one side of the tilting direction of the controller 50, and the speed setting unit 46 is configured as a mechanism for setting the target rotation speed of the motor 30. The speed setting unit 46 includes a rotating knob 47 and an operating dial 48. The operating dial 48 is formed in the shape of a circular plate with a thickness direction roughly in the tilting direction, and is configured to be rotatable in the axial direction roughly in the tilting direction. A portion of the operating dial 48 is exposed from the rear housing 24 to one side in an orthogonal direction so as to be operable. The rotating knob 47 is configured as a rotary variable resistor and is electrically connected to the controller 50. In addition, the rotating knob 47 is connected to the operating dial 48, and an output signal corresponding to the rotation position of the operating dial 48 is output to the controller 50, and the controller 50 sets the rotation speed of the rotating shaft 30A of the motor 30.

[0066] An operation unit 60 is provided at the lower end of the rear housing 24 on the other side of the tilt direction of the controller 50. The operation unit 60 is configured to operate a mechanism of the lighting device 80 described later. The operation unit 60 includes an operation button 61 and an operation switch 62. The operation button 61 is exposed from the outer periphery of the rear housing 24 in a press-operable manner. The operation switch 62 is configured by a tactile switch and the like, and is electrically connected to the controller 50. When the operation button 61 is pressed to turn on the operation switch 62, an on signal is output from the operation switch 62 to the controller 50.

[0067] (About gearbox 27)

[0068] Also Figure 3 and Figure 4As shown, the gear box 27 is formed into a hollow shape that is roughly triangular when viewed from the left and right directions, and is open to the lower side and the rear side. A connected portion 27A is formed at the rear end of the gear box 27, and the connected portion 27A is formed into a roughly rectangular cylindrical shape corresponding to the enlarged diameter portion 21A of the motor housing 21. And the connected portion 27A and the enlarged diameter portion 21A are butted in the front-to-back direction, so that the outer periphery of the connected portion 27A is fastened and fixed to the enlarged diameter portion 21A. A packaging area 70 is provided on the lower side of the gear box 27. That is, the open portion of the gear box 27 on the lower side is closed (covered) by the packaging area 70. The packaging area 70 is formed into a two-step stepped cylindrical shape with the up-down direction as the axial direction, and is fixed to the gear box 27. Specifically, in the packaging area 70, the outer diameter of the upper end is set to be larger than the outer diameter of the middle portion in the up-down direction, and the outer diameter of the middle portion in the up-down direction is set to be larger than the outer diameter of the lower end. The packaging area 70 is fixed to the gear box 27 by fixing screws 250. A retainer 26 is provided on the rear side of the gear box 27. That is, the open portion of the gear box 27 to the rear side is closed (covered) by the retainer 26. In addition, the retainer 26 may cover the entire open portion of the gear box 27 to the rear side, or may cover only a portion. The retainer 26 is a metal plate-shaped member that serves to press and position the second motor bearing 32 held in the gear box 27 from the rear. The retainer 26 has a circular through hole in the center portion through which the rotating shaft 30A is inserted. In addition, air holes for the airflow generated by the fan 34 to pass through are provided at the upper and lower portions of the retainer 26. The retainer 26 may be fixed or not fixed to the gear box 27. An exhaust port 27C is provided at the upper portion of the gear box 27. In addition, the lower portion of the rear portion of the gear box 27 (especially the central portion in the left-right direction) does not cover the motor housing 21 (retainer 26). As a result, a space for the airflow generated by the fan 34 sent from the motor housing 21 to pass through is formed at the lower portion of the rear portion of the gear box 27. In addition, there may be no space for airflow in the lower part of the rear part of the gear box 27. The gear box 27 has at least a transmission mechanism accommodating space for accommodating a reduction mechanism (including a transmission mechanism of a pinion 33 and a bevel gear 74 described later) inside, and a ventilation space that is connected to the exhaust port 27C so that airflow from the fan 34 passes through. A handle mounting portion 102 (details will be described later) on which a side handle 29 can be mounted is provided at the rear of the gear box 27. In addition, the gear box in the present invention may include a packaging area 70. In addition, the gear box in the present invention may include a retainer 26.

[0069] The gear box 27 is provided with a housing 27D. The housing 27D is a portion for housing a bevel gear 74. A spindle 71 is provided inside the housing 27D, and the spindle 71 is formed into a substantially cylindrical shape with the vertical direction as the axial direction. The upper end of the spindle 71 is rotatably supported by a bearing 72 fixed to the gear box 27, and the middle portion of the spindle 71 in the vertical direction is rotatably supported by a bearing 73 fixed to the packaging area 70. The bevel gear 74 is provided on the upper end side portion of the spindle 71 so as to be rotatable as a whole, and the pinion 33 of the motor 30 is meshed with the bevel gear 74. Thus, the driving force of the motor 30 is transmitted to the spindle 71 through the bevel gear 74. A grindstone 75 as a front end tool is installed at the lower end of the spindle 71, and the grindstone 75 is formed into a substantially circular plate shape with the vertical direction as the plate thickness direction. Thus, the grindstone 75 rotates together with the spindle 71 by the driving force of the motor 30 to perform grinding processing on the workpiece. That is, the spindle 71 and the bevel gear 74 are configured as a transmission mechanism for transmitting the driving force of the motor 30 to the grindstone 75. In addition, a wheel cover 76 as a cover member is detachably fixed to the lower end of the packaging area 70. The wheel cover 76 covers the rear part of the grindstone 75 from the upper side and the rear side. Specifically, the wheel cover 76 is formed in a substantially circular plate shape, and the outer peripheral portion of the wheel cover 76 is bent downward, and covers the rear part of the grindstone 75 from the rear side.

[0070] like Figure 3 As shown in FIG. 2 , a fixing screw 251 is provided at the rear of the gear box 27 as a fixing member for fixing the gear box 27 to the motor housing 21. Four fixing screws 251 are provided. Figures 1 to 4 As shown, an exhaust port 27C (and a passage space for air connected to the exhaust port 27C), a handle mounting portion 102, and a fixing screw 251 (a fixing structure with the motor housing 21) are provided at the rear portion of the gear box 27 (the portion that is more rearward than the main shaft 71), and at least a portion of the lighting device of the present invention is also provided. The fixing screw 251 is provided at the end in the up-down direction and the end in the left-right direction. That is, when viewed from the front-to-back direction, the fixing screw 251 is provided at the oblique end (corner) of the gear box 27. The exhaust port 27C is provided at and near the center position in the left-right direction. The handle mounting portion 102 is provided near the center position in the up-down direction. The lighting device 80 described later is provided to avoid the configuration area of ​​the fixing screw 251, the exhaust port 27C (the passage for air), and the handle mounting portion 102 (supported by the gear box 27 at the avoided position).

[0071] (Regarding lighting device 80)

[0072] Although the details will be described later, the lighting device 80 (the lighting device in the present invention) includes an LED 81 as a light source, a lighting substrate 82 on which the LED 81 is mounted, a wiring 83 for supplying power to the LED 81 (the lighting substrate 82), and a holder 84 for holding the lighting substrate 82. Figure 1 ,as well as Figures 3 to 10 As shown, at least a portion of the lighting device 80 is provided on both left and right sides of the housing 20. In detail, a portion of the lighting device 80 is configured to straddle the boundary between the motor housing 21 and the gear box 27 at the side portion in the left-right direction of the housing 20. In more detail, the retainer 84 (details will be described later) included in the lighting device 80 is configured to extend from a position overlapping with the motor housing 21 to a position overlapping with the gear box 27 when viewed from the left-right direction. In addition, the front portion of the lighting device 80 is visually exposed to the outside at the side portion (left and right side portions) of the rear end portion of the gear box 27. Exposed here means not covered, exposed when viewed from the left side means that the left side (at least a portion) of the lighting device 80 is not covered, and exposed when viewed from the front means that the front side (at least a portion) of the lighting device 80 is not covered. The lighting device 80 is arranged outside in the left-right direction compared to the accommodating portion 27D. Therefore, the lighting device 80 is arranged outside in the left-right direction compared to the bevel gear 74. The pair of left and right lighting devices 80 are configured to be symmetrical with respect to the left-right center of the grinder 10. In other words, the shapes and structures of the left lighting device 80 and the right lighting device 80 are in a mirror image relationship, and the shape and features of one are the same as the mirror image of the other. Therefore, in the following description, the left lighting device 80 will be described, and the description of the right lighting device 80 will be appropriately omitted.

[0073] The lighting device 80 includes an LED 81 as a light source (see Figure 8 ), a lighting substrate 82 on which an LED 81 is mounted, and a holder 84 for holding the lighting substrate 82. In the lighting device 80, the holder 84 is assembled to the gear box 27 and the fan guide 35, and the front portion of the holder 84 is visually exposed to the outside at both sides of the left and right directions of the rear end portion of the gear box 27. Therefore, hereinafter, the structure of the mounting portion of the lighting device 80 in the gear box 27 and the fan guide 35 will be described first, and then the components of the lighting device 80 will be described. In addition, the LED 81 and the lighting substrate 82 correspond to the light-emitting portion of the present invention.

[0074] (Regarding the Mounting Portion of the Fan Guide 35)

[0075] like Figures 5 to 8As shown, a rear mounting portion 90 for mounting a holder 84 of the lighting device 80 is formed on the left side portion of the fan guide 35. When viewed from the left side, the rear mounting portion 90 is formed into a concave shape open to the front side. A guide portion 91 is provided at the upper end portion of the rear mounting portion 90. The guide portion 91 is formed into a roughly rail shape extending in the front-to-back direction, and is formed into a roughly inverted L shape when viewed from the front side. In detail, the guide portion 91 includes an upper wall 91A, and a side wall 91B extending downward from the left end portion of the upper wall 91A. The front portion of the guide portion 91 protrudes toward the front side compared to the front end of the fan guide 35. Ribs 91C are respectively formed on the left and right side surfaces of the side wall 91B (see Figure 6 ), the rib 91C extends in the front-rear direction and is formed into a substantially triangular shape when viewed from the front ( Figure 6 , only the left rib 91C is shown).

[0076] A mounting rail portion 92 is formed at the lower end of the rear mounting portion 90. The mounting rail portion 92 extends in the front-to-back direction and is formed in a substantially U-shape that is open to the upper side when viewed from the front side. That is, a rail groove 92A is formed in the mounting rail portion 92 as a first groove portion that is open to the upper side and extends in the front-to-back direction, and the front end of the rail groove 92A is open to the front side. Ribs 92B are integrally formed on both left and right side surfaces of the rail groove 92A (see FIG. 1 ). Figure 6 ), the rib 92B extends in the front-rear direction and is formed into a substantially triangular shape when viewed from the front ( Figure 6 , only the right rib 92B is shown).

[0077] (Regarding the Mounting Section of the Gear Box 27)

[0078] like Figure 1 , Figure 3 , Figure 5 , Figure 7 as well as Figure 8 As shown, a front mounting portion 95 for mounting a holder 84 of the lighting device 80 and exposing the holder 84 to the outside is formed on the left side of the rear end portion of the gear box 27. The front mounting portion 95 is a recess (cutout) that is recessed inward in the left-right direction. In more detail, the front mounting portion 95 is formed in a groove shape that extends in the front-to-back direction and is open to the left side, and is arranged adjacent to the rear oblique lower side of the handle mounting portion 102 described later. The front mounting portion 95 is penetrated in the front-to-back direction, and the rear end opening of the front mounting portion 95 is closed from the rear side by the enlarged diameter portion 21A of the motor housing 21. In addition, the aforementioned rear mounting portion 90 is located on the rear side of the front mounting portion 95 when viewed from the left side. When viewed from the left side, the upper surface of the front mounting portion 95 is inclined upward as it moves toward the rear side. In addition, the rear portion of the front mounting portion 95 is penetrated in the left-to-right direction. Since the front mounting portion 95 is formed, the range in which the gear case 27 covers (the front opening of) the motor housing 21 is reduced accordingly.

[0079] A front engaging portion 96 extending downward is formed at the front portion of the upper surface of the front mounting portion 95. When viewed from the left side, the front engaging portion 96 is formed in a substantially triangular block shape, and the lower surface of the front engaging portion 96 is arranged along a surface orthogonal to the up-down direction, and is arranged facing the lower surface of the front mounting portion 95 in the up-down direction. The front engaging portion 96 is arranged at a position that is one level lower to the right than the outer peripheral surface of the gear box 27. An engaging groove portion 96A is formed at a corner portion of the rear end of the front engaging portion 96. The engaging groove portion 96A is formed in a concave shape that is open to the lower side and the rear side.

[0080] An upper extension portion 97 extending downward is formed at the rear of the upper surface of the front mounting portion 95. The upper extension portion 97 is formed in a rib shape extending in the front-rear direction with the left-right direction as the plate thickness direction. The upper extension portion 97 is arranged at a position one level lower to the right than the outer peripheral surface of the gear box 27, and the left surface of the upper extension portion 97 is arranged flush with the left surface of the front engaging portion 96.

[0081] A step portion 98 that is stepped down one step to the right is formed at the lower end of the front mounting portion 95 and at the boundary with the outer peripheral portion of the gear case 27 . The step portion 98 extends in the front-rear direction and penetrates in the front-rear direction.

[0082] (Regarding retainer 84)

[0083] like Figure 1 , one class Figure 3 to Figure 9 As shown, the holder 84 of the lighting device 80 is formed of a resin material that can transmit light. In this embodiment, the holder 84 is made of a transparent resin material. The holder 84 includes a holder body 85 constituting the front part of the holder 84, and a mounting piece 86 constituting the rear part of the holder 84. In addition, the mounting piece 86 is assembled to the fan guide 35, and the holder body 85 is assembled to the gear box 27.

[0084] When viewed from the right side, the retainer body 85 is formed into a substantially L-shaped plate shape with the left-right direction as the thickness direction (see Fig. 9). Specifically, the retainer body 85 includes a first base 85A which constitutes the rear portion of the retainer body 85 and extends in the up-down direction, and a second base 85B which extends from the lower end of the first base 85A to the front side. A substrate retaining groove 85C for retaining the lighting substrate 82 described later is formed in the first base 85A. When viewed from the left-right direction, the substrate retaining groove 85C extends in a direction slightly inclined toward the front side as it moves toward the upper side, and the upper end of the substrate retaining groove 85C is open to the upper side. In addition, a step portion 85D that is lowered one level to the lower side is formed at the front portion of the upper surface of the first base 85A, and the upper side opening of the substrate retaining groove 85C is formed at the step portion 85D. The substrate retaining groove 85C is formed in a roughly T-shape when viewed from its long side direction. Specifically, the substrate holding groove 85C includes a first holding groove portion 85C1 that is substantially rectangular and has the left-right direction as the long side direction when viewed from the long side direction of the substrate holding groove 85C, and a second holding groove portion 85C2 that protrudes forward from the left-right center portion of the first holding groove portion 85C1.

[0085] A connecting groove 85E is formed at the rear end of the first base 85A in the middle in the left-right direction as a second groove portion for opening the substrate holding groove 85C to the rear. The connecting groove 85E extends in the vertical direction, and the upper end of the connecting groove 85E is open to the upper side.

[0086] The mounting piece 86 is formed into a substantially rectangular plate shape with the left-right direction as the plate thickness direction, and extends from the right end of the rear surface of the holder body 85 to the rear side. The left side of the mounting piece 86 is arranged flush with the right side of the connecting groove 85E. In addition, the lower end of the mounting piece 86 is inserted into the rail groove 92A of the fan guide 35 from the front side, and the mounting piece 86 is assembled to the fan guide 35. In the state where the mounting piece 86 is assembled to the fan guide 35, the upper end of the mounting piece 86 is arranged adjacent to the right side of the side wall 91B of the guide part 91 of the fan guide 35, and the front end of the guide part 91 is inserted into the connecting groove 85E of the holder 84. Further, in the state where the mounting piece 86 is assembled to the fan guide 35, the left and right pair of ribs 92B of the mounting rail part 92 clamp the mounting piece 86 from the left and right outer sides, and the left and right side surfaces of the connecting groove 85E clamp the left and right pair of ribs 91C of the guide part 91 from the left and right outer sides, thereby restricting the left and right movement of the holder 84. Furthermore, when the mounting piece 86 is mounted on the fan guide 35, the mounting piece 86 is engaged with the guide portion 91 and the mounting rail portion 92 to restrict the vertical and rearward movement of the mounting piece 86. That is, the mounting piece 86 is inserted from the front side into the rear mounting portion 90 of the fan guide 35 and is engaged with the fan guide 35 in the vertical and left-right directions.

[0087] At the right end portion of the upper surface of the second base portion 85B of the retainer body 85, an engaging protrusion 85F is formed on the front side of the first base portion 85A. The engaging protrusion 85F is formed in a substantially rectangular block shape and protrudes upward from the second base portion 85B. Furthermore, the retainer body 85 is inserted from the rear side into the front mounting portion 95 of the gear box 27 and assembled to the gear box 27. In addition, when the retainer body 85 is assembled to the gear box 27, the engaging protrusion 85F is inserted from the rear side into the engaging groove portion 96A of the front mounting portion 95, and the engaging protrusion 85F engages with the engaging groove portion 96A in the left-right direction (refer to Figure 8 In addition, when the retainer body 85 is assembled to the gear box 27, the retainer body 85 is engaged with the front mounting portion 95 in the up-down direction to limit the up-down movement of the retainer body 85, and the retainer body 85 is clamped by the gear box 27 and the motor housing 21 in the front-to-back direction to limit the front-to-back movement of the retainer 84.

[0088] A cover 85G is formed at the left end of the retainer body 85, and the cover 85G is formed into a roughly trapezoidal plate shape with the left-right direction as the plate thickness direction. The outer shape observed from the left side of the cover 85G is formed corresponding to the shape of the front mounting portion 95, and the upper and lower ends of the cover 85G protrude outward in the upper and lower directions compared to the first base 85A and the second base 85B. When the retainer body 85 is assembled to the gear box 27, the outer periphery of the cover 85G is arranged close to the left side of the front side engaging portion 96, the step portion 98, and the upper side protruding portion 97 of the gear box 27, and the cover 85G can be visually exposed from the gear box 27 to the left. That is, the cover 85G is configured as an appearance portion exposed to the outside from the outer periphery of the gear box 27. When the retainer 84 (a part of the lighting device 80) is supported on the front mounting portion 95, the portion of the motor housing 21 that is not covered with the gear box 27 is covered (closed). In other words, the front end opening of the motor housing 21 is configured so as to close a predetermined range in cooperation with the gear box 27 and the retainer 84. The predetermined range may be the entire range or a part of the range.

[0089] (Regarding the lighting substrate 82)

[0090] like Figure 8 and Fig. 9As shown, the lighting substrate 82 is formed into a generally elongated plate shape, and is accommodated in the first holding groove portion 85C1 of the substrate holding groove 85C in the holder 84 from the upper side, and is held in the holder 84. An LED 81 is provided on the front surface of the lighting substrate 82, and the LED 81 is arranged in the second holding groove portion 85C2 of the holder 84. The LED 81 is electrically connected to the controller 50 via the lighting substrate 82. Specifically, the wiring 83 extending from the lighting substrate 82 passes through the connecting groove 85E and is arranged on the left side of the mounting piece 86 (that is, between the guide portion 91 and the mounting rail portion 92). In addition, the wiring 83 is arranged on the outer peripheral portion of the fan guide 35, extends to the rear side at the radial outer side of the motor 30, and is electrically connected to the controller 50. The LED 81 is configured to irradiate the light emitted to the front obliquely downward side. Specifically, the light emitted by the LED 81 passes through the inside of the holder body 85 and travels to the front obliquely downward side from the front end surface of the holder body 85 (the second base portion 85B). In other words, light is irradiated diagonally forward and downward by the LED 81 and the holder body 85 .

[0091] The lighting device 80 is arranged at a position that overlaps with the wheel cover 76 in the front-to-back direction and is located on the rear side of the main shaft 71. In addition, the lighting device 80 is arranged at an upper side than the wheel cover 76 and on a lower side than the axis AL of the motor 30. In addition, the lighting device 80 is arranged at a position that overlaps with the main shaft 71 in the upper-lower direction (the range from the upper end to the lower end of the main shaft 71). Furthermore, when viewed from the front, the front end portion of the retainer 84 of the lighting device 80 is visually exposed. Thus, the light emitted by the LED 81 is irradiated from the left-right direction outer side and the rear side of the main shaft 71 to the surrounding of the lower part of the main shaft 71, so as to illuminate the front part of the grindstone 75.

[0092] (About Protection Agency 100)

[0093] The protection mechanism 100 is provided around the lighting device 80 and is configured as a mechanism portion for protecting the lighting device 80. For example, if the left and right side surfaces of the housing 20 are placed on a flat surface such as the ground, the protection mechanism 100 prevents the holder 84 of the lighting device 80 exposed outside the housing 20 from contacting the ground.

[0094] Hereinafter, the protection mechanism 100 provided around the lighting device 80 on the left side will be described first, and then the protection mechanism 100 provided around the lighting device 80 on the right side will be described.

[0095] like Fig.10As shown, the protection mechanism 100 includes a handle mounting portion 102 as a front side protection portion formed on the outer periphery of the gear box 27, and a rear protection portion 104 as a pair of upper and lower rear side protection portions formed on the outer periphery of the motor housing 21. The handle mounting portion 102 is arranged on the front oblique upper side of the lighting device 80. Specifically, the handle mounting portion 102 is arranged adjacent to the front oblique upper side of the front side mounting portion 95. The handle mounting portion 102 is formed into a generally cylindrical shape along a direction inclined toward the front side as it approaches the left side, and protrudes to the left side from the outer periphery of the gear box 27. The rear end portion of the handle mounting portion 102 is arranged to overlap with the front portion of the retainer 84 in the lighting device 80 when viewed from above, and protrudes to the left side compared to the retainer 84. A threaded portion 102A is provided on the inner periphery of the handle mounting portion 102, and an internal thread is formed in the threaded portion 102A. It is configured as a side handle 29 (refer to Figure 3 and Figure 4 ) is screwed into the threaded portion 102A, so that the side handle 29 (auxiliary handle) is mounted to the gear box 27. That is, the handle mounting portion 102 can be configured as a mounting portion for mounting the side handle 29. And, when viewed from above, the front end portion of the retainer 84 is arranged adjacent to the lower side of the handle mounting portion 102 and is visually exposed.

[0096] The upper and lower pair of rear guards 104 are formed into a rib shape with the thickness direction in the up-down direction, and are arranged close to the outer side in the up-down direction of the switch rod 40. That is, in the front-to-back direction, the lighting device 80 (the cover portion 85G) is arranged between the handle mounting portion 102 and the rear guard 104. The rear guard 104 extends rearward from the enlarged diameter portion 21A of the motor housing 21, and the left end portion of the rear guard 104 protrudes to the left side compared to the enlarged diameter portion 21A. The lower rear guard 104 is arranged on the rear side of the lighting device 80 (cover portion 85G), and the handle mounting portion 102 is arranged between the upper and lower pair of rear guards 104 in the up-down direction. In addition, the position of the left end of the rear guard 104 in the left-right direction is roughly consistent with the position of the rear end portion of the handle mounting portion 102. Therefore, when the housing 20 is placed on the ground GR (refer to Fig.10 ) (when the left side of the housing 20 is placed in contact with the ground), the rear end of the handle mounting portion 102 and the rear protective portion 104 are in contact with the ground, and the retainer 84 of the lighting device 80 exposed outside the housing 20 is spaced apart from the right side relative to the ground GR.

[0097] The protection mechanism 100 provided around the lighting device 80 on the right side omits the rear guard portion 104 compared to the protection mechanism 100 provided around the lighting device 80 on the left side. That is, the protection mechanism 100 provided around the lighting device 80 on the right side is composed of only the handle mounting portion 102. In the case of the lighting device 80 on the right side, it is configured so that the handle mounting portion 102 and the enlarged diameter portion 21A contact the ground GR. In addition, in the protection mechanism 100 provided around the lighting device 80 on the right side, a pair of upper and lower rear guard portions 104 may be provided on the motor housing 21 so that the left and right protection mechanisms 100 are configured to be left-right symmetrical.

[0098] (Effect)

[0099] Next, the operation and effects of the grinding machine 10 of this embodiment will be described.

[0100] When performing processing using the grinder 10 configured as described above, the operator operates the operating dial 48 while holding the handle portion 23 of the housing 20 to set the rotation speed of the motor 30. Then, by sliding the switch lever 40 from the closed position to the open position, the switch 41 is turned on, so that the motor 30 is driven and the spindle 71 and the grindstone 75 are rotated. Thus, the grinder 10 can perform grinding processing on the workpiece.

[0101] In addition, lighting devices 80 are provided on both left and right sides of the rear end of the gear box 27, and the lighting devices 80 are arranged on the upper side of the wheel cover 76. Specifically, the holder 84 of the lighting device 80 can be visually exposed from the outer periphery of the gear box 27, and when viewed from the front, the holder 84 can be visually arranged. In addition, when the LED 81 of the lighting device 80 emits light by the operator's operation of the operating unit 60, the surrounding of the lower part of the main shaft 71 (that is, the grindstone 75) is illuminated by the emitted light. That is, the light irradiated from the lighting device 80 provided on both sides of the housing 20 to the grindstone 75 is not blocked by the housing 20, and the grindstone 75 arranged around the lower part of the main shaft 71 can be illuminated by the light. Therefore, the lower part of the main shaft 71 (that is, the grindstone 75) can be well illuminated. The lighting device 80 is configured to irradiate light forward and downward, and is therefore exposed to the front (configured so that the front side is not covered). The left lighting device 80 (holder 84) is also exposed to the left, so that it can also irradiate light to a wide range to the left, thereby improving the visibility of a wide range. The right lighting device 80 can also irradiate light to a wide range to the right in the same way.

[0102] Furthermore, a protection mechanism 100 for protecting the lighting device 80 is provided around the lighting device 80. Specifically, a handle mounting portion 102 is provided in the gear case 27, and the handle mounting portion 102 is arranged adjacent to the front oblique upper side of the holder 84 of the lighting device 80, and the rear end portion of the handle mounting portion 102 protrudes outward in the left-right direction compared with the lighting device 80. In addition, a rear guard portion 104 is provided on the left side of the motor housing 21, and the rear guard portion 104 is arranged on the rear side of the holder 84 of the lighting device 80, and protrudes outward in the left-right direction compared with the lighting device 80. Thus, for example, when the left side surface of the housing 20 is placed on a plane such as the ground GR, the handle mounting portion 102 and the rear guard portion 104 are in contact with the ground GR, and the holder 84 of the lighting device 80 is arranged to be spaced apart from the ground GR. Thus, even if the lighting device 80 is configured to be exposed outside the housing 20, the protection performance of the lighting device 80 can be improved. In other words, when the lighting device 80 is placed on a plane with the exposed direction facing downward, the lighting device 80 is configured to be spaced apart from the ground GR, so that the protection performance of the lighting device 80 can be improved. In the present embodiment, although the lighting device 80 disposed on the left side is exposed to the left, it is configured so that even if the lighting device 80 is placed on the ground GR with the left side facing downward, it will not contact the ground GR. That is, even if a plane extending frontward, rearward, and upward and downward is brought close to the lighting device 80 in the left-right direction, the contact of the lighting device 80 with the plane is suppressed by the protection function (protrusion) provided on the housing 20. In the present embodiment, although the lighting device 80 is protected by the handle mounting portion 102 and the rear guard portion 104 that protrude respectively, the lighting device 80 may be located inside compared to the outer surface (outer profile) of the gear box 27 or the motor housing 21. Even in this case, since the gear box 27 or the motor housing 21 is relatively located outside (protruding) than the lighting device 80, the contact of the lighting device 80 with the ground GR can be suppressed. By configuring in this way, the lighting device 80 that can illuminate a wide area to the left and right can be protected.

[0103] In addition, as described above, the handle mounting portion 102 is disposed adjacent to the front oblique upper side of the holder 84 of the lighting device 80, and when viewed from the front, a portion of the holder 84 is disposed adjacent to the lower side of the handle mounting portion 102 and is visually exposed. Thus, while the handle mounting portion 102 is disposed close to the front side of the lighting device 80, it is possible to suppress the handle mounting portion 102 (and the side handle 29 attached thereto) from blocking the light irradiated from the lighting device 80 toward the grindstone 75. That is, since the handle mounting portion 102 is located above the lighting device 80 that is configured to illuminate the front and lower side, it is possible to suppress the light irradiated from the handle mounting portion 102 toward the grindstone 75. Therefore, the lighting performance of the lighting device 80 and the protection performance of the lighting device 80 can be achieved at the same time. In addition, since the lighting device 80 is disposed outside in the left-right direction compared to the housing portion 27D (bevel gear 74), it is possible to suppress the housing portion 27D from blocking the light toward the front. Furthermore, although the light irradiated rightward from the left lighting device 80 is blocked by the accommodating portion 27D, the right lighting device 80 irradiates the light toward the right, so that the irradiation of light toward the left and right is appropriately performed.

[0104] In addition, the handle mounting portion 102 is configured as a mounting portion for mounting the side handle 29 on the gear box 27. Therefore, the lighting device 80 can be protected by the handle mounting portion 102 for mounting the side handle 29 on the gear box 27. In other words, the side handle 29 can be mounted on the gear box 27 without affecting the lighting performance of the lighting device 80 on the grindstone 75.

[0105] In addition, the lighting device 80 is located on the rear side of the main shaft 71 and outside in the left-right direction, and the holder 84 of the lighting device 80 can be visually exposed from the rear end of the gear box 27. Furthermore, the lighting device 80 is arranged at a position overlapping with the main shaft 71 in the vertical direction (lower than the upper end of the main shaft 71 and higher than the lower end). As a result, while suppressing the distance between the lighting device 80 and the grindstone 75 from becoming longer, the light from the lighting device 80 can be irradiated toward the grindstone 75 (around the main shaft 71). In addition, by arranging the lighting device 80 at the rear end of the gear box 27, the necessity of arranging the wiring 83 extending from the lighting device 80 in the gear box 27 that accommodates the transmission mechanism such as the main shaft 71 is reduced. As a result, the workability when assembling the lighting device 80 can be improved. As described above, while improving the workability when assembling the lighting device 80, the grindstone 75 can be illuminated more well.

[0106] In addition, in the lighting device 80, the mounting piece 86 of the holder 84 is accommodated in the motor housing 21 and assembled to the fan guide 35 (internal component) assembled to the motor 30, and the holder body 85 of the holder 84 is assembled to the gear box 27. Therefore, the lighting device 80 can be assembled to the housing 20 by assembling the gear box 27 to the motor housing 21 in a state where the lighting device 8 is temporarily assembled to the fan guide 35. In this way, one end side of the lighting device 80 in the front-back direction is supported by the motor housing 21, and the other end side is supported by the gear box 27. Thus, the lighting device 80 is supported at two positions in the front and back, so the lighting device 80 is firmly supported, thereby suppressing the lighting device 80 from shaking. If the lighting device 80 shakes, dust may enter from the gap, so firmly supporting the lighting device 80 is also effective for ensuring airtightness. In the grinder 10, since the fan guide 35 is a particularly large-diameter component, it is important to place the lighting device 80 (LED 81) in front of the fan guide 35, but this is appropriately addressed by using the fan guide 35 as a support component for the lighting device 80. In addition, as an internal component, it is not necessary to be the fan guide 35, for example, it can be configured as an insulator assembled to the motor 30, which is also a circular ring-shaped component. In the grinder 10, since the fan guide 35 is located right behind the gear box 27, it is used as a support portion for the lighting device 80, but as long as the positional relationship is the same, it can be configured so that other components support the lighting device 80 as internal components.

[0107] In addition, when the lighting device 80 is assembled to the housing 20, the holder 84 (holder body 85) of the lighting device 80 is sandwiched between the front mounting portion 95 of the gear box 27 and the front end portion of the motor housing 21 in the front-to-back direction. Thus, as described above, the lighting device 80 can be assembled to the housing 20 by mounting the gear box 27 from the front side to the motor housing 21 that accommodates the motor 30. That is, by assembling the gear box 27 to the motor housing 21, the lighting device 80 can be positioned (especially, the forward and left-right movement is restricted), so the assembly performance is good.

[0108] In addition, the lower end of the mounting piece 86 of the holder 84 in the lighting device 80 is inserted from the front side into the track groove 92A of the fan guide 35, so that the track groove 92A and the mounting piece 86 are engaged in the left-right direction. Thus, by inserting the mounting piece 86 into the track groove 92A of the fan guide 35, the lighting device 80 can be assembled to the fan guide 35. Thus, while improving the assembly performance of the lighting device 80 to the fan guide 35, the lighting device 80 can be assembled to the fan guide 35 with a simple structure. In addition, the holder body 85 includes a second base 85B extending forward from the first base 85A holding the LED 81. And, the light of the LED 81 is irradiated forward from the front end of the second base 85B. By configuring in this way, the light irradiation port can be easily changed by adjusting the position of the LED 81. Therefore, by slightly extending the second base 85B forward, the light irradiation range toward the front can be adjusted.

[0109] In addition, a guide portion 91 is formed in the fan guide 35, and the guide portion 91 is arranged adjacent to the outer side of the upper end portion of the mounting piece 86 of the retainer 84 in the left-right direction. Therefore, when the mounting piece 86 of the retainer 84 is inserted into the fan guide 35, the mounting piece 86 can be guided by the guide portion 91. Therefore, the assembly property of the retainer 84 to the fan guide 35 can be further improved. In addition, a connecting groove 85E is formed in the retainer 84, and the front end portion of the guide portion 91 is inserted into the connecting groove 85E, and the guide portion 91 is engaged with the retainer 84 in the left-right direction. As a result, the retainer 84 is engaged with the fan guide 35 at two locations, upper and lower. Therefore, the assembled state of the retainer 84 to the fan guide 35 can be well maintained.

[0110] In addition, in the lighting device 80, the wiring 83 extending from the lighting substrate 82 is arranged outside the mounting piece 86 in the left-right direction. That is, the wiring 83 is arranged between the guide portion 91 of the fan guide 35 and the mounting rail portion 92. Thus, the wiring extending from the lighting substrate 82 to the rear side can be well maintained by the guide portion 91 and the mounting rail portion 92, and can be folded back to the controller 50 on the rear side.

[0111] In addition, the gear box 27 is provided with a front mounting portion 95 of the holder body 85 into which the holder 84 is inserted, and the front mounting portion is formed in a groove shape that is open to the front side and the outside in the left-right direction. Thus, while the light emitted by the LED 81 is irradiated from the front end of the holder 84, the holder body 85 can be covered from both sides in the upper and lower directions by the inner peripheral surface of the front mounting portion 95. Therefore, while ensuring the lighting performance of the lighting device 80, the holder 84 can be protected from both sides in the upper and lower directions by the gear box 27. In addition, the front mounting portion 95 is configured to be a groove shape, and a part of the lighting device 80 is inserted from the front end opening of the motor housing 21. That is, since the gear box 27 and the holder 84 cooperate to close the front end opening of the motor housing 21, the motor housing 21 can maintain the previous shape. In addition, the front mounting portion 95 does not necessarily have to be open to the left and right. For example, the front mounting portion 95 can be configured to be able to insert the holder 84 in the front-to-back direction, or it can be a through hole in the front-to-back direction. In that case, since the holder 84 is at least partially covered by the gear case 27 in the left-right direction, it is possible to improve the protection performance of the holder 84. In addition, in this case, since the opening of the hole penetrating in the front-back direction allows the lighting device 80 to be visually recognized when viewed from the front-back direction, it is possible to properly irradiate light forward.

[0112] In addition, an engagement groove 96A is formed in the front mounting portion 95 of the gear box 27, and the engagement projection 85F of the retainer 84 is inserted into the engagement groove 96A, so that the gear box 27 and the retainer 84 are engaged in the left-right direction. Thus, the state in which the retainer 84 (lighting device 80) is assembled to the gear box 27 can be well maintained.

[0113] (Variation 1 of the Configuration of the Illumination Device 80)

[0114] Next, use Fig.11 Modification 1 of the configuration of the lighting device 80 is described. As shown in the figure, in modification 1 of the configuration of the lighting device 80, the lighting device 80 is arranged on the left and right side portions of the front end portion of the motor housing 21. Specifically, a cover portion 21C that protrudes outward in the left-right direction and is open to the front side is formed at the front end portion of the motor housing 21. The lighting device 80 is arranged inside the cover portion 21C. That is, compared with the first embodiment, due to the formation of the cover portion 21C, the front end opening of the motor housing 21 becomes larger accordingly, and even if it is a gear box 27 that does not have a front side mounting portion 95 (recessed portion), the cover portion 21C cannot be closed, and instead the lighting device 80 covers the cover portion 21C. As a result, as in the first embodiment, the gear box 27 and the lighting device 80 cooperate to close the front end opening of the motor housing 21.

[0115] As in the present embodiment, the lighting device 80 is disposed on the upper side of the wheel cover 76 and on the lower side than the axis AL of the motor 30, and is disposed in a position overlapping with the main shaft 71 in the vertical direction. In addition, when viewed from the front, the holder 84 of the lighting device 80 is disposed on the left-right outer side and on the lower side of the handle mounting portion 102, and is exposed so as to be visually identifiable.

[0116] Furthermore, the light emitted by the LED 81 (not shown) of the lighting device 80 is irradiated from the front end surface of the holder 84 to the front obliquely downward side, so that the lower part of the spindle 71 (that is, the grinding stone 75) is illuminated by the light. Therefore, in the modification example 1, the light irradiated from the lighting device 80 provided at both sides of the housing 20 toward the grinding stone 75 is not blocked by the housing 20, and the grinding stone 75 arranged around the lower part of the spindle 71 can be illuminated by the light.

[0117] In addition, in the first modification, the lighting device 80 is located on the rear side and the outer side in the left-right direction relative to the main shaft 71, and the holder 84 of the lighting device 80 can be visually exposed from the front end of the motor housing 21. That is, the lighting device 80 is provided on both sides of the housing 20 so as to be visually visible from the front through the opening (cover portion 21C) provided in the front direction of the housing 20, and is arranged at a position overlapping with the wheel cover 76 in the front-back direction. Therefore, in the first modification, the distance between the lighting device 80 and the grindstone 75 is suppressed from being increased, and it is not necessary to arrange the wiring 83 extending from the lighting device 80 in the gear box 27 that accommodates the transmission mechanism of the main shaft 71 and the like. Therefore, in the first modification, the workability of the lighting device 80 during assembly is improved, and the grindstone 75 can be illuminated more effectively.

[0118] In addition, in the modification 1, the holder 84 of the lighting device 80 is covered by the cover portion 21C of the motor housing 21. Thus, the protection performance of the lighting device 80 can be improved.

[0119] (Variation 2 of the Configuration of the Illumination Device 80)

[0120] Next, use Fig.12 Modification 2 of the configuration of the lighting device 80 is described. As shown in the figure, in modification 2 of the configuration of the lighting device 80, the lighting device 80 is provided on both left and right side portions of the front end portion of the motor housing 21. Specifically, an exposed portion 21D for exposing the lighting device 80 is formed on the side portion of the front end portion of the motor housing 21, and the exposed portion 21D is cut into a concave shape open to the front side. In addition, on the outer peripheral portion of the gear case 27, a groove portion 27B extending in the front-to-back direction and open to the outside in the left-to-right direction is formed on the front side of the exposed portion 21D. The groove portion 27B penetrates in the front-to-back direction, and through the groove portion 27B, the front end portion of the retainer 84 of the lighting device 80 can be visually identified when viewed from the front.

[0121] As in the present embodiment, the lighting device 80 is disposed on the upper side of the wheel cover 76 and on the lower side than the axis AL of the motor 30, and in the vertical direction, is disposed at a position overlapping with the main shaft 71. In addition, when viewed from the front, the holder 84 of the lighting device 80 is disposed on the lower side of the handle mounting portion 102 and is exposed to be visually recognized.

[0122] Furthermore, light emitted from the LED 81 (not shown) of the lighting device 80 is irradiated from the front end surface of the holder 84 to the obliquely downward front side, and the lower portion of the spindle 71 (i.e., the grinding stone 75) and the surroundings thereof are illuminated by the light. Thus, in the second modification, the light irradiated from the lighting device 80 provided at both sides of the housing 20 toward the grinding stone 75 is not blocked by the housing 20, and the grinding stone 75 disposed around the lower portion of the spindle 71 can be illuminated by the light.

[0123] In addition, in the second modification, the lighting device 80 is located on the rear side and the outer side in the left-right direction relative to the main shaft 71, and the holder 84 of the lighting device 80 can be visually exposed from the front end of the motor housing 21. That is, the lighting device 80 is provided on both sides of the housing 20 and is arranged at a position overlapping with the wheel cover 76 in the front-back direction. Therefore, in the second modification, while suppressing the distance between the lighting device 80 and the grindstone 75 from becoming longer, it is not necessary to arrange the wiring 83 extending from the lighting device 80 in the gear box 27 that accommodates the transmission mechanism such as the main shaft 71. Therefore, in the second modification, the workability of the lighting device 80 during assembly is improved, and the grindstone 75 can be illuminated more effectively. In addition, in the second modification, since it is not necessary to provide a structure for supporting the lighting device 80 on the gear box 27 side, it can be realized with a simple structure.

[0124] In addition, also in the second modification, the lighting device 80 is disposed between the handle mounting portion 102 and the rear guard portion 104. Thus, the lighting device 80 can be protected by the protection mechanism 100.

[0125] (Variation 3 of the arrangement of the lighting device 80)

[0126] Next, use Fig.13Modification 3 of the configuration of the lighting device 80 will be described. As shown in the figure, in modification 3 of the configuration of the lighting device 80, the front end portion of the motor housing 21 in the grinder 10 is composed of a frame-shaped gasket 110, and the lighting device 80 is provided on both left and right sides of the gasket 110. Specifically, an exposed portion 110A for exposing the lighting device 80 is formed on the side of the gasket 110, and the exposed portion 110A is cut into a concave shape open to the front side, like the exposed portion 21D of modification 2. In addition, as in modification 2, a groove portion 27B extending in the front-to-back direction and open to the outside in the left-to-right direction is formed on the outer peripheral portion of the gear case 27 at the front side of the exposed portion 110A. The groove portion 27B penetrates in the front-to-back direction, and through the groove portion 27B, the front end portion of the holder 84 of the lighting device 80 is exposed so as to be visually recognizable when viewed from the front.

[0127] As in the present embodiment, the lighting device 80 is disposed above the wheel cover 76 and below the axis AL of the motor 30, and is disposed at a position overlapping the main shaft 71 in the vertical direction. In addition, when viewed from the front, the holder 84 of the lighting device 80 is disposed on the lower side of the handle mounting portion 102 and is exposed to be visually recognized.

[0128] Furthermore, light emitted from the LED 81 (not shown) of the lighting device 80 is irradiated from the front end surface of the holder 84 to the obliquely downward front side, and the lower portion of the spindle 71 (i.e., the grinding stone 75) and the surroundings thereof are illuminated by the light. Thus, in the third modification as well, the light irradiated from the lighting device 80 provided at both sides of the housing 20 toward the grinding stone 75 is not blocked by the housing 20, and the grinding stone 75 disposed around the lower portion of the spindle 71 can be illuminated by the light.

[0129] In addition, in the third modification, the lighting device 80 is located on the rear side and the outer side in the left-right direction relative to the main shaft 71, and the holder 84 of the lighting device 80 can be visually exposed from the spacer 110 between the motor housing 21 and the gear box 27. That is, the lighting device 80 is provided on both sides of the housing 20 and is arranged at a position overlapping with the wheel cover 76 in the front-back direction. Therefore, in the third modification, while suppressing the distance between the lighting device 80 and the grindstone 75 from becoming longer, it is not necessary to arrange the wiring 83 extending from the lighting device 80 in the gear box 27 that accommodates the transmission mechanism such as the main shaft 71. Therefore, in the third modification, the workability of the lighting device 80 during assembly is improved, and the grindstone 75 can be illuminated more effectively.

[0130] In addition, in the modified example 3, the lighting device 80 is arranged between the handle mounting portion 102 and the rear protection portion 104. Thus, the lighting device 80 can be protected by the protection mechanism 100. In addition, the modified example 3 is characterized in that the additional gasket 110 is improved to hold the lighting device 80, but regarding the holding structure, the lighting device 80 can also be held by the cover portion extending to the left and right as in the modified example 1. Thus, the lighting device 80 can be mounted without changing the shape of the conventional motor housing 21 and the gear box 27 (no need to provide a cutout, etc.).

[0131] (Variation 4 of the arrangement of the lighting device 80)

[0132] Next, use Fig.14 and Fig.15 Modification 4 of the arrangement of the lighting device 80 will be described. As shown in these drawings, in Modification 4 of the arrangement of the lighting device 80 , a pair of left and right lighting devices 80 are provided at the lower end of the rear housing portion 24 of the handle housing 22 .

[0133] When viewed from the side, the lighting device 80 is arranged on the upper side of the wheel cover 76 and on the lower side than the axis AL of the motor 30, and is arranged at a position overlapping with the main shaft 71 in the vertical direction. In addition, when viewed from the front side, the holder 84 of the lighting device 80 is arranged on the left-right outer side of the lower end of the gear box 27 and is visually exposed (see FIG. Fig.14 ).

[0134] Furthermore, light emitted from the LED 81 (not shown) of the lighting device 80 is irradiated to the front side from the front end surface of the holder 84, and the lower part of the spindle 71 (that is, the grinding stone 75) and the surroundings thereof are illuminated by the light. Thus, in the fourth modification as well, the light irradiated from the lighting device 80 provided at both sides of the housing 20 toward the grinding stone 75 is not blocked by the housing 20, and the grinding stone 75 arranged around the lower part of the spindle 71 can be illuminated by the light.

[0135] In the first embodiment, the lighting device 80 is provided on both left and right side portions of the housing 20 , but the lighting device 80 may be provided on one of the left and right side portions of the housing 20 .

[0136] In the first embodiment, the rear portion of the holder 84 of the lighting device 80 is assembled to the fan guide 35 , but the rear portion of the holder 84 may be assembled to the front end portion of the motor housing 21 .

[0137] (Second Embodiment)

[0138] Next, use Figures 16 to 20Disc grinder 200 (hereinafter referred to as grinder 200) as a working machine of the second embodiment is described. Although this embodiment can be called Modification 5 in the sense that the configuration of the lighting device is different, it is described as the second embodiment of the present invention because of the many differences from the first embodiment. The grinder 200 of the second embodiment is configured similarly to the grinder 10 of the first embodiment except for the points shown below. In addition, Figures 16 to 20 In the drawings, components having the same configuration as those of the grinding machine 10 according to the first embodiment are denoted by the same reference numerals.

[0139] In the grinding machine 200, a lighting device 210 is provided in the housing 20 instead of the lighting device 80. The lighting device 210 has a holder 212, which constitutes the outer shell (at least a part of) the lighting device 210 and is configured to accommodate and hold components such as LED 232 and LED 234 described later. The holder 212 includes a relay holder 214 as a pair of left and right second holding parts, and a light-transmitting holder 216 as a first holding part. In addition, the lighting device 210 has a holder cover 240 that covers the light-transmitting holder 216 from the upper side.

[0140] A pair of relay retainers 214 are made of resin. The pair of relay retainers 214 are constructed in substantially the same manner as the retainer 84 of the first embodiment, and the rear portion of the relay retainer 214 is assembled to the rear mounting portion 90 of the fan guide 35 (not shown). That is, the relay retainer 214 is located on the left-right outer side relative to the main shaft 71. The front portion of the relay retainer 214 protrudes forward from both left-right ends of the enlarged diameter portion 21A of the motor housing 21 as the first housing, and is arranged in the front mounting portion 95 of the gear box 27. The relay retainer 214 is clamped between the front end edge of the enlarged diameter portion 21A of the motor housing 21 and the front mounting portion 95 of the gear box 27 from both sides in the front-to-back direction to restrict movement in the front-to-back direction. In addition, the front end portion of the relay retainer 214 protrudes forward in a manner arranged on the lower side of the handle mounting portion 102.

[0141] Furthermore, although not shown in the figure, in the second embodiment, when the housing 20 is placed on a flat surface such as the ground with the left side facing downward, the rear end of the handle mounting portion 102 and the rear protective portion 104 are in contact with the ground, so that the relay retainer 214 is spaced apart to the right relative to the ground.

[0142] The front part of the relay holder 214 is provided with a terminal 220 (see Fig.16 and Fig.17 The terminal 220 extends in the front-to-back direction, and the front end of the terminal 220 is bent downward and protrudes downward from the front end of the relay holder 214. The wiring 226 (see Fig.17 and Fig. 20) is connected to the rear end of the terminal 220. The wiring 226 extends from the terminal 220 to the rear side and is electrically connected to the controller 50.

[0143] Like the holder 84 of the first embodiment, the light-transmitting holder 216 is made of a resin material (transparent resin material) that can transmit light. The light-transmitting holder 216 is provided below the upper end of the packaging area 70 and radially outside the middle portion of the packaging area 70 in the vertical direction, and is fastened to the gear box 27 together with the holder cover 240 and the packaging area 70 described later. That is, the light-transmitting holder 216 is located below the gear box 27 and the relay holder 214.

[0144] The light-transmitting retainer 216 is formed into a roughly annular shape as a whole, and is formed into a concave shape that is open to the upper side. When the light-transmitting retainer 216 is fixed to the gear box 27, the middle part of the packaging area 70 in the vertical direction is arranged in the light-transmitting retainer 216. That is, the light-transmitting retainer 216 is arranged along the circumference of the packaging area 70 in a manner of surrounding the middle part of the packaging area 70 in the vertical direction on the radial outer side of the main shaft 71, and can be visually exposed from the front side and both sides in the left and right directions. In addition, the light-transmitting retainer 216 is located on the upper side compared to the grindstone 75 and the wheel cover 76. And, in the second embodiment, the gear box 27 and the packaging area 70 are used as the second housing of the present invention, and the gear box 27 and the packaging area 70 respectively correspond to the split components of the present invention.

[0145] A pair of left and right fixing portions 216A are formed at the front and rear ends of the light-transmitting holder 216, respectively. The fixing portions 216A are arranged at a position raised one step upward relative to the lower surface of the light-transmitting holder 216. A fixing hole 216B is formed through the fixing portion 216A in the vertical direction (see Fig. 20 ). In addition, in the light-transmitting holder 216, metal sleeves 218 are provided at positions corresponding to the fixing portions 216A (see Fig. 20 ), the sleeve 218 is formed into a roughly cylindrical shape with the vertical direction as the axial direction. The lower end of the sleeve 218 is embedded in the fixing hole 216B, and the sleeve 218 protrudes upward from the fixing portion 216A. In addition, the light-transmitting retainer 216 is arranged on the lower side of the upper end of the packaging area 70, and the fixing screw 250 as a fixing member is inserted into the sleeve 218 from the lower side. Through the fixing screw 250, the light-transmitting retainer 216 is fastened and fixed to the gear box 27 together with the packaging area 70. In addition, when the light-transmitting retainer 216 is fixed to the gear box 27, the outer shape of the light-transmitting retainer 216 is set so that the retainer 212 does not protrude from the gear box 27 when viewed from above.

[0146] A pair of left and right relay connection parts 216C are provided at the rear end of the light-transmitting holder 216. The relay connection parts 216C extend outward in the left-right direction from the light-transmitting holder 216 at a position on the rear side relative to the main shaft 71, and the middle part of the long side direction of the relay connection parts 216C is bent upward. The front end of the relay connection parts 216C is arranged adjacent to the lower side of the front end of the relay holder 214. A connector 222 is provided in the front end of the relay connection parts 216C, and the front end of the terminal 220 is connected to the connector 222.

[0147] Three illumination substrates 230 are accommodated in the light-transmitting holder 216. One illumination substrate 230 is arranged in the central part in the left-right direction of the front end of the light-transmitting holder 216 with the front-to-back direction as the plate thickness direction, and is held in the light-transmitting holder 216. An LED 232 as a light source is provided on the front surface of the illumination substrate 230. The LED 232 is located on the front side relative to the main shaft 71, and emits light to the front side. The LED 232 is arranged at a position overlapping with the main shaft 71 when viewed from the front side, and is arranged at a position overlapping with the gear box 27 when viewed from the top side.

[0148] The other two illumination substrates 230 are respectively arranged in the middle part of the front-back direction between the left and right ends of the light-transmitting holder 216 with the left and right directions as the plate thickness direction, and are held by the light-transmitting holder 216. LEDs 234 as light sources are provided on the left and right outer surfaces of the left and right illumination substrates 230. The LEDs 234 are located outside the left and right directions relative to the main shaft 71, and emit light to the left and right directions. In addition, the LEDs 234 are arranged at a position overlapping with the main shaft 71 when viewed from the left and right directions, and at a position overlapping with the gear box 27 when viewed from the upper side. Furthermore, the illumination substrate 230 and the LEDs 232, and the illumination substrate 230 and the LEDs 234 correspond to the light-emitting parts of the present invention.

[0149] The LED 232 and the LED 234 are connected in series through the wiring 224 arranged in the light-transmitting holder 216, and are connected to the connector 222. Thus, the LED 232 and the LED 234 are electrically connected to the controller 50, and power is supplied from the battery 44 (power supply unit) to the LED 232 and the LED 234 under the control of the controller 50, so that the LED 232 and the LED 234 emit light. In addition, the terminal 220, the connector 222, and the wiring 224 correspond to the connection part of the present invention.

[0150] The retainer cover 240 is formed into a roughly annular plate shape with the vertical direction as the plate thickness direction, and the shape of the retainer cover 240 is formed corresponding to the outer shape of the light-transmitting retainer 216. And, in a state where the retainer cover 240 closes the opening of the retainer 212, the retainer cover 240 is clamped between the retainer 212 and the packaging area 70 in the vertical direction. In addition, a through hole 240A at the upper end of the insertion sleeve 218 is formed through the retainer cover 240. Further, a connection cover portion 240B corresponding to the relay connection portion 216C is formed at the rear end of the retainer cover 240. The connection cover portion 240B extends outward from the retainer cover 240 in the left-right direction and is bent upward. And, the aforementioned connector 222 is retained at the front end of the connection cover portion 240B.

[0151] As described above, in the second embodiment, the light emitted by the LED 232 of the lighting device 210 passes through the light-transmitting holder 216 and shines toward the front side from the front end surface of the light-transmitting holder 216, and the front side and surrounding of the lower part of the spindle 71 (that is, the grindstone 75) are illuminated by the light. In addition, the light emitted by the LED 234 of the lighting device 210 passes through the light-transmitting holder 216 and shines toward the left and right sides from the left and right sides of the light-transmitting holder 216, and the surrounding of the left and right sides of the lower part of the spindle 71 (that is, the grindstone 75) are illuminated by the light. Thus, in the second embodiment as well, the light irradiated toward the grindstone 75 from the lighting device 210 provided in the housing 20 is not blocked by the housing 20, and the grindstone 75 arranged around the lower part of the spindle 71 can be illuminated by the light.

[0152] In addition, in the lighting device 210 of the second embodiment, the light-transmitting holder 216 holding the LEDs 232 and 234 is arranged to surround the main shaft 71 on the radially outer side of the main shaft 71. Therefore, the LEDs 232 and 234 can be arranged at any position on the radially outer side of the main shaft 71, and the grindstone 75 arranged around the lower part of the main shaft 71 can be illuminated. In addition, the LEDs 232 and 234 irradiate the emitted light toward the radially outer side (front side or left and right outer side) of the main shaft 71. Thus, it is possible to prevent the light irradiated from the LEDs 232 and 234 from being blocked by the main shaft 71. Therefore, the periphery of the grindstone 75 can be effectively illuminated.

[0153] In particular, in the second embodiment, since the LED 232 is located at the front side compared to the spindle 71, when processing is performed using the front part of the grindstone 75, the front part and the periphery of the grindstone 75 can be effectively illuminated. In addition, since the LED 234 is located at the left-right outer side of the spindle 71, when processing is performed using the left-right outer end of the grindstone 75, both left-right sides of the grindstone 75 can be effectively illuminated. Thus, the operability of the grinder 200 can be further improved.

[0154] In addition, the light-transmitting holder 216 is arranged to surround the middle part of the packaging area 70 in the vertical direction from the radial outside, and is located on the upper side of the grindstone 75. Furthermore, the LED 232 and the LED 234 overlap with the gear box 27 when viewed from the upper side. Thus, while suppressing the enlargement of the light-transmitting holder 216, the surroundings of the grindstone 75 can be effectively illuminated by the LEDs 232 and 234.

[0155] In the lighting device 210 of the second embodiment, the holder 212 includes a relay holder 214 and a light-transmitting holder 216. The relay holder 214 is assembled to the fan guide 35, and the movement of the relay holder 214 to the rear side is restricted by the motor housing 21, and the movement of the relay holder 214 to the front side is restricted by the gear box 27. Thus, the relay holder 214 can be fixed to the housing 20 with a simple structure. In addition, the light-transmitting holder 216 is arranged on the lower side of the gear box 27, and is fixed to the gear box 27 together with the packaging area 70 by the fixing screw 250. Thus, the light-transmitting holder 216 can be fixed to the gear box 27 while suppressing the increase in the number of parts. In addition, by locating the light-transmitting holder 216 on the lower side of the gear box 27, it is unnecessary to arrange the wiring 224 for connecting the LEDs 232 and 234 in the gear box 27 that accommodates the transmission mechanism such as the spindle 71. This improves the workability during assembly of the light-transmitting holder 216 and enables good illumination of the area around the grindstone 75 .

[0156] In addition, the light-transmitting holder 216 is arranged below the upper end of the packaging area 70, and is arranged to surround the middle part of the packaging area 70 in the vertical direction, and the shape of the light-transmitting holder 216 is set so that the light-transmitting holder 216 does not protrude from the gear box 27 when viewed from the upper side. Thus, while suppressing the enlargement of the overall body structure of the grinding machine 200, the LEDs 232 and 234 can be arranged on the radially outer side of the spindle 71.

[0157] In the second embodiment, the terminal 220 is held by the relay holder 214, and the terminal 220 is connected to the connector 222, so that the controller 50 is electrically connected to the LEDs 232 and 234, but the method of connecting the controller 50 to the LEDs 232 and 234 is not limited thereto. For example, a substrate having a relay connector connected to the connector 222 may be held by the relay holder 214, so that the controller 50 and the LEDs 232 and 234 are electrically connected.

[0158] Reference numerals

[0159] 10: disc grinder (working machine), 20: housing, 21: motor housing (first housing), 27: gear box (second housing, partition), 30: motor, 35: fan guide (internal component), 44: battery (power supply unit), 70: packaging area (second housing, partition), 71: spindle, 75: grindstone (front end tool), 76: wheel cover (cover component), 80: lighting device, 81: LED (light source), 82: lighting substrate, 83: wiring, 84: holder, 85E: connecting groove (second groove portion), 86: mounting plate (rear portion of holder), 9 1: guide portion, 92A: rail groove (first groove portion), 950: protection mechanism, 102: handle mounting portion (front side protection portion), 104: rear protection portion (rear side protection portion), 200: disc grinder (working machine), 210: lighting device, 212: holder, 214: relay holder (second holding portion), 216: light-transmitting holder (first holding portion), 220: terminal (connecting portion), 222: connector (connecting portion), 224: wiring (connecting portion), 232: LED (light source), 234: LED (light source), 250: fixing screw (fixing part).

Claims

1. A working machine, characterized in that: have: A motor that rotates with a forward and backward direction as an axis; a housing having a motor housing for accommodating the motor, and a gear box disposed on a front side of the motor housing; A main shaft supported by the gear box, extending in the up-down direction, being rotated by the driving force of the motor, and having a disc-shaped front end tool detachably mounted at the lower part; a cover member mounted on the gear box and covering at least a portion of the front end tool; as well as A lighting device, at least a portion of which is provided above the cover member and at least one of the left and right side portions of the housing, extends from the inside of the motor housing, and irradiates light toward the periphery of the lower portion of the spindle in a manner passing through the outside of the gear box.

2. A working machine, characterized in that: have: A motor that rotates with a forward and backward direction as an axis; a housing having a motor housing for accommodating the motor, and a gear box disposed on a front side of the motor housing; A main shaft supported by the gear box, extending in the up-down direction, being rotated by the driving force of the motor, and having a disc-shaped front end tool detachably mounted at the lower part; a cover member mounted on the gear box and covering at least a portion of the front end tool; and an illumination device disposed on a lower side than the axis of the motor and illuminating the surroundings of the lower portion of the spindle, At least a portion of the lighting device is disposed on the upper side of the cover member and on at least one of the left and right sides of the shell, and when viewed from the front side of the shell, the lighting device can be visually identified through a space formed by an opening facing forward or a recessed portion facing left and right directions provided in the shell.

3. The working machine according to claim 1 or 2, characterized in that: have: A protection mechanism that prevents a flat surface such as a ground surface or a floor from coming into contact with the lighting device when the flat surface is brought close to the lighting device in a left-right direction.

4. The working machine according to claim 3, characterized in that: The lighting device is configured to be visually recognizable even when viewed from the front, and the protection mechanism is configured to protrude to the outside of the housing more than the lighting device.

5. The working machine according to claim 4, characterized in that: The protection agencies include: a front protection portion disposed adjacent to the front side of the lighting device; and a rear side protection portion, which is arranged at the rear side of the lighting device, When viewed from the front side of the housing, a portion of the lighting device is arranged adjacent to a lower side of the front protection portion.

6. The working machine according to claim 1 or 2, characterized in that: The lighting device is located above the front tool and behind and outside the main shaft.

7. The working machine according to claim 6, characterized in that: The lighting device is exposed to be visible from outer peripheral portions of left and right side portions of the gear case.

8. The working machine according to claim 7, characterized in that: The lighting device comprises: a light emitting unit having a light source; and a holder that holds the light emitting portion, The rear portion of the retainer is connected to the motor housing or an internal component accommodated in the motor housing, A front portion of the retainer is connected to the gear box.

9. The working machine according to claim 8, characterized in that: The rear portion of the retainer is assembled to the inner component, and the inner component is assembled to the motor, The retainer is sandwiched between the gear case and the motor housing in the front-rear direction.

10. A working machine, characterized in that: have: A first housing extending in the front-rear direction, having an opening portion opened to the front side at a front end portion, and accommodating a motor; A second housing, which is provided on the front side of the first housing, supports and holds a spindle for the front end tool, and is connected to the first housing in a manner covering the opening; as well as a lighting device, a part of which is located in the first housing and another part of which extends forward from the opening and irradiates light around the front tool, At least a portion of the opening is covered by the second housing, and at least a portion of a portion not covered by the second housing is covered by the lighting device.

11. The working machine according to claim 10, characterized in that: The lighting device includes: a light emitting unit having a light source; and a connecting unit connecting a power supply unit for supplying power to the light source and the light source. The light emitting unit is disposed outside the first housing.

12. The working machine according to claim 11, characterized in that: The lighting device includes a holder that holds the light emitting portion and the connecting portion. The holder holds the light emitting portion at a position forward of the main axis.

13. The working machine according to claim 12, characterized in that: The holder is configured to surround the main shaft and includes a first holding portion for holding the light emitting portion and the connecting portion, and a second holding portion for holding the connecting portion. The rear portion of the second holding portion is accommodated inside the first housing, and the front portion of the second holding portion protrudes from the opening toward the front side and is sandwiched between the first housing and the second housing in the front-rear direction.

14. The working machine according to claim 13, characterized in that: The first holding portion is arranged radially outward of the spindle and above the tip tool relative to the lower end portion of the second housing. When viewed from an upper side, the light source overlaps the second housing.

15. The working machine according to claim 13, characterized in that: The second housing is composed of two or more divided parts. The first holding portion is fixed to the second housing by a fixing member that fixes the divided members to each other.

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