Work equipment

Abstract

Provided is a working machine including a satisfactory illuminating device.　In a grinder 10, illuminating devices 80 are provided in both left and right side portions of a rear end portion of a gear housing 27, and are disposed above a wheel guard 76. More specifically, a holder 84 of each illuminating device 80 is visibly exposed from an outer peripheral portion of the gear housing 27, and the holder 84 is visibly disposed when viewed from the front. Furthermore, when LEDs 81 of the illuminating devices 80 emit light as a result of an operation performed by an operator on an operating unit 60, the periphery of a lower portion (in other words, a grinding wheel 75) of a spindle 71 is illuminated by the emitted light. In other words, light emitted toward the grinding wheel 75 from the illuminating devices 80 provided in both side portions of the housing 20 is not blocked, and the grinding wheel 75 disposed around the lower portion of the spindle 71 can be illuminated by said light. The lower portion (in other words, the grinding wheel 75) of the spindle 71 can therefore be satisfactorily illuminated.

Description

Technical Field

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

Background Art

[0002] In the grinder (working machine) described in Patent Document 1 below, a motor is housed inside a motor housing extending in the front-rear direction, and a spindle is housed inside a gear housing arranged on the front side of the motor housing. A tip tool such as a grindstone is attached to the lower end of the spindle, and a part of the tip tool is covered by a wheel guard. By driving the motor, the grindstone rotates together with the spindle, and polishing processing or the like can be performed on the workpiece.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in a working machine such as the above grinder, workability can be improved by illuminating the periphery of the lower part (tip tool) of the spindle with a lighting device. However, a working machine such as the above grinder may be placed on a flat surface such as the ground, and depending on the location of the lighting device, there is a risk that the lighting device will be damaged or deformed by the ground. Further, in a working machine such as the above grinder, depending on the position of the lighting device, the spindle or the wheel guard may block the light, making it difficult to illuminate the periphery of the lower part of the spindle. For this reason, it is desirable for a working machine to have a good lighting device.

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine having a good lighting device.

Means for Solving the Problems

[0006] One or more embodiments of the present invention include a housing having a motor that rotates about an axis in the front-rear direction, a motor housing that houses the motor, and a gear housing disposed in front of the motor housing; a spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part; a guard member mounted on the gear housing and covering at least a part of the tip tool; and at least a part The gear housing is equipped with a lighting device that extends from inside the motor housing so as to pass outside the gear housing, and the lighting device is On the upper side of the guard member and at least one of the left and right sides of the housing Located, and from a position behind the spindle Light is shone towards the area around the lower part of the spindle. Having a light-emitting part, That is the case.

[0007] One or more embodiments of the present invention include a housing having a motor that rotates about an axis in the front-rear direction, a motor housing that houses the motor, and a gear housing disposed in front of the motor housing; a spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part; and a guard member mounted on the gear housing and covering at least a portion of the tip tool. Supported inside the motor housing or on the outer surface of the gear housing, and illuminating the area around the lower part of the spindle. Below the axis of the aforementioned motor Shine light from this position. Equipped with a lighting device, The aforementioned housing is Viewed from the front of the housing, So as to protrude from the outer casing of the gear housing The aforementioned motor housing at least one of the left and right sides in It will be established in Convex part, or In the gear housing left and right Provided on at least one side of dent Having at least one of the convex portion and the concave portion, such that a portion of the front end of the motor housing is not covered by the gear housing when viewed from the front, and in a position that overlaps with the portion of the front end of the motor housing when viewed from the front. The aforementioned lighting device The part illuminated by light but Placed This is a work machine that is visible to the naked eye.

[0008] One or more embodiments of the present invention are work machines equipped with a protective mechanism that suppresses contact between a flat surface, such as the ground or a floor, and the lighting device when the lighting device is brought close together in the left-right direction.

[0009] One or more embodiments of the present invention are work machines in which the lighting device is configured to be visible when viewed from the front, and the protective mechanism is configured to protrude outward from the housing than the lighting device.

[0010] One or more embodiments of the present invention are: A housing comprising a motor that rotates about an axis in the front-rear direction, a first housing housing the motor, and a second housing positioned in front of the first housing; a spindle supported by the second housing, which rotates when the driving force of the motor is transmitted to it, and to which a tip tool is detachably attached; a lighting device having a light-emitting part that extends from inside the first housing so that at least a portion passes outside the second housing and is provided on one side of the housing in the left-right direction, and which irradiates light from the light-emitting part toward the lower part of the spindle; and a protective mechanism that suppresses contact between the lighting device and a plane such as the ground or floor when the lighting device is brought close to the plane in the left-right direction. The aforementioned protective mechanism , configured to protrude outward from the housing more than the lighting device, Note Light-emitting part Front Distributed to The front protective part that is placed, and the Light-emitting part The work machine comprises a rear protective section located on the rear side of the front protective section, and a part of the lighting device is located below the front protective section.

[0011] One or more embodiments of the present invention are work machines in which the lighting device is located above the tip tool and behind and outward in the left-right direction from the spindle.

[0012] One or more embodiments of the present invention are work machines in which the lighting device is visible from the outer periphery of the left and right sides of the gear housing.

[0013] One or more embodiments of the present invention are: A housing comprising a motor that rotates about an axis in the front-rear direction, a motor housing that houses the motor, and a gear housing positioned in front of the motor housing; a spindle supported by the gear housing, which rotates when the driving force of the motor is transmitted to it, and to which a tip tool is detachably attached; and an illumination device, at least a portion of which is provided on at least one of the left and right sides of the housing, extending from inside the motor housing so as to pass outside the gear housing, and illuminating the area around the lower part of the spindle with light; The lighting device comprises a light-emitting unit having a light source and a holder for holding the light-emitting unit, the rear of the holder being connected to the motor housing or an inner member housed in the motor housing, and the front of the holder being connected to the gear housing.

[0014] One or more embodiments of the present invention are work machines in which the rear portion of the holder is assembled to the inner member which is assembled to the motor, and the holder is sandwiched in the front-rear direction by the gear housing and the motor housing.

[0015] One or more embodiments of the present invention include a housing having a motor that rotates about an anteroposterior axis, a motor housing that houses the motor, and a gear housing disposed on the front side of the motor housing, a spindle supported by the gear housing, extending in the vertical direction, being rotated by transmission of the driving force of the motor, and having a disk-shaped tip tool detachably attached to the lower part thereof, a guard member attached to the gear housing and covering at least a part of the tip tool, one side in the left-right direction a handle attachment portion provided in the gear housing and attachable with a side handle that can be gripped by an operator, and a light emitting portion located above the guard member and below the handle attachment portion, and an illumination device that irradiates light toward the periphery of the lower part of the spindle by the light emitting portion. From one side in the left-right direction It is a working machine. The handle mounting portion has a portion that protrudes to one side in the left-right direction from at least a part of the lighting device that is not covered from one side in the left-right direction by the gear housing and the motor housing. One or more embodiments of the present invention

[0016] are working machines in which the light emitting portion is disposed outside the ,before above. Motor housing One or more embodiments of the present invention are working machines in which the illumination device has a holder that holds the light emitting portion and the connecting portion, and the holder holds the light emitting portion at a position anterior to the spindle.

[0017] One or more embodiments of the present invention A power supply unit that supplies power to the light-emitting unit and a connecting unit that connects the light-emitting unit, The rear part of the holder is housed inside the motor housing, and the front part of the and, projects forward from the motor housing and is sandwiched front and back by the motor housing and the gear housing.

[0018] One or more embodiments of the present invention A housing comprising a motor that rotates about an axis in the front-rear direction, a motor housing that houses the motor, and a gear housing positioned in front of the motor housing; a spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part; a guard member mounted on the gear housing and covering at least a part of the tip tool; and an illumination device having a light-emitting part located above the guard member, which irradiates light toward the lower part of the spindle; wherein the illumination device has a holder for holding the light-emitting part. The front part of the Da projects forward from the motor housing and is sandwiched front and back by the motor housing and the gear housing. holder One or more embodiments of the present invention

[0019] One or more embodiments of the present invention The lighting device comprises a power supply unit that supplies power to the light-emitting unit, a connecting unit that connects the power supply unit and the light-emitting unit, and a holder that holds the light-emitting unit and the connecting unit. The holder holds the light-emitting unit at a position in front of the spindle, and the holder is arranged to surround the spindle and includes a first holding part that holds the light-emitting unit and the connecting unit, and a second holding part that holds the connecting unit.The first holding portion is positioned radially outward of the spindle relative to the lower end of the gear housing and above the tip tool, and the light-emitting portion overlaps with the gear housing when viewed from above.

[0020] One or more embodiments of the present invention are: The lighting device comprises a power supply unit that supplies power to the light-emitting unit, a connecting unit that connects the power supply unit and the light-emitting unit, and a holder that holds the light-emitting unit and the connecting unit. The holder holds the light-emitting unit at a position in front of the spindle, and the holder is arranged to surround the spindle and includes a first holding part that holds the light-emitting unit and the connecting unit, and a second holding part that holds the connecting unit. The gear housing is composed of at least two or more divided members, and the first holding portion is fixed to the gear housing by fasteners that fix the divided members together. [Effects of the Invention]

[0021] According to one or more embodiments of the present invention, a work machine having a good lighting device can be provided. [Brief explanation of the drawing]

[0022] [Figure 1] This is a side view from the left, showing a disc grinder according to the first embodiment. [Figure 2] Figure 1 is a side cross-sectional view from the left, showing the inside of the disc grinder. [Figure 3] Figure 1 is a front view of the disc grinder as seen from the front. [Figure 4] Figure 1 is a plan view of the front of the disc grinder, seen from above. [Figure 5] Figure 1 is a side view from the left, showing the lighting device holder removed from the gear housing and fan guide. [Figure 6] Figure 5 is a perspective view of the holder and fan guide shown from the left front. [Figure 7] Figure 5 is a perspective view of the holder, gear housing, and fan guide, taken from the left rear. [Figure 8] This is a cross-sectional view from the left side (enlarged cross-sectional view along line 8-8 in Figure 3) showing the assembly of the lighting device to the gear housing and fan guide. [Figure 9] This figure shows the lighting device on the left, as shown in Figure 1. [Figure 10] This is a cross-sectional view from above (section 10-10 in Figure 1) showing the left-side protection mechanism. [Figure 11] This figure shows variation 1 of the lighting device arrangement shown in Figure 1. [Figure 12] This figure shows variation 2 of the lighting device arrangement shown in Figure 1. [Figure 13] This figure shows variation 3 of the lighting device arrangement shown in Figure 1. [Figure 14] This is a front view showing variation 4 of the lighting device arrangement shown in Figure 1. [Figure 15] Figure 14 is a side view from the left of variation 4 of the lighting device arrangement shown. [Figure 16] This is a front view showing an enlarged view of the lower part of the front section of the disc grinder according to the second embodiment. [Figure 17] Figure 16 is a side view of the front left side of the disc grinder shown. [Figure 18] This is a cross-sectional view from below (section 18-18 in Figure 16) showing the state in which the lighting device shown in Figure 16 is fixed to the gear housing. [Figure 19] This is a cross-sectional view from the left side (section 19-19 in Figure 16) showing the state in which the lighting device shown in Figure 16 is fixed to the gear housing. [Figure 20] Figure 16 is a perspective view of the lighting device shown, taken from the left front, with the holder cover removed from the light-transmitting holder. [Modes for carrying out the invention]

[0023] (First Embodiment) Hereinafter, the disc grinder 10 (hereinafter simply referred to as "grinder 10") as a work machine according to the first embodiment will be described with reference to Figures 1 to 10. The arrows UP, FR, and LH shown in the drawings indicate the top, front, and left sides of the grinder 10, respectively. In the following description, when using the directions of up / down, front / back, and left / right, unless otherwise specified, these refer to the up / down, front / back, and left / right directions of the grinder 10.

[0024] As shown in Figures 1 to 4, the grinder 10 is configured as a tool for performing grinding and other processes on a workpiece using a grinding wheel 75 as the tip tool. The grinder 10 also has a pair of left and right illumination devices 80 that illuminate the area around the grinding wheel 75, and a protective mechanism 100 for protecting the illumination devices 80. The overall configuration of the grinder 10 will be described first, followed by a description of the illumination devices 80 and the protective mechanism 100.

[0025] (Regarding the overall configuration of Grinder 10) As shown in Figures 1 and 2, the grinder 10 is formed in a substantially cylindrical shape that extends in the front-rear direction as a whole, and the outer casing of the grinder 10 is made up of a housing 20. The housing 20 is made up of a motor housing 21 that forms the middle part of the housing 20 in the front-rear direction, a handle housing 22 that forms the rear part of the housing 20, and a gear housing 27 that forms the front end of the housing 20.

[0026] (Regarding the motor housing 21) The motor housing 21 is made of resin and is formed in a roughly bottomed cylindrical shape that is open to the front. The motor 30 is housed inside the motor housing 21. The motor 30 is electrically connected to a controller 50, which will be described later, and is driven by the control of the controller 50. The motor 30 consists of a rotating shaft 30A, a rotor 30B, and a stator 30C. The motor 30 is a brushless motor, and resin insulators are provided on the front and rear of the stator 30C.

[0027] The rotating shaft 30A is oriented axially in the front-rear direction, and its rear end is rotatably supported by a first motor bearing 31 held in the rear wall of the motor housing 21. The front end of the rotating shaft 30A is located inside a gear housing 27, which will be described later, and its front end portion is rotatably supported by a second motor bearing 32 held in the gear housing 27. A pinion gear 33 is fixed to the front end of the rotating shaft 30A. The rotor 30B is located radially outside the rotating shaft 30A and is configured to rotate integrally with the rotating shaft 30A. The stator 30C is formed in a substantially cylindrical shape with its axial direction oriented axially, and is supported by the motor housing 21 radially outside the rotor 30B.

[0028] A fan 34 is provided on the front end of the rotating shaft 30A, behind the second motor bearing 32, so as to be able to rotate integrally with it. The fan 34 is configured as a centrifugal fan, and is configured to generate an airflow from the rear to the front.

[0029] A fan guide 35 is provided as an inner member 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, and an insertion portion 35A is formed through the center of the bottom wall of the fan guide 35, through which the rotating shaft 30A of the motor 30 is inserted. The fan guide 35 is assembled to the tip of the stator 30C of the motor 30 and is sandwiched in the front-rear direction between the gear housing 27 (described later) and the motor 30. The fan guide 35 guides the airflow directed radially outward by the fan 34 forward. The air guided forward by the fan guide 35 is exhausted to the outside through the exhaust port 27C (described later).

[0030] The front end of the motor housing 21 has an enlarged diameter portion 21A, which is an opening that extends radially outward. The enlarged diameter portion 21A is formed in a roughly rectangular shape when viewed from the front, and when viewed from the left side, it is formed in a roughly rectangular shape with the vertical direction as the longitudinal direction, and opens to the front. A switch lever 40 (see Figure 1) is also provided on the left side of the motor housing 21. The switch lever 40 is connected to the motor housing 21 so as to be slidable in the front-rear direction. Specifically, the switch lever 40 is configured to slide between the off position shown in Figure 1 and the on position (not shown) which is slid forward from the off position.

[0031] A switch holder 21B is integrally provided on the rear wall of the motor housing 21. The switch holder 21B protrudes rearward from the motor housing 21 and is formed in a roughly rectangular box shape that is open to the right. A switch 41 is held in the switch holder 21B. The switch 41 is electrically connected to a controller 50, which will be described later. When the aforementioned switch lever 40 is operated from the off position to the on position, the switch 41 is turned on and outputs an on signal to the controller 50. Specifically, a slide bar 42 is connected to the switch lever 40, and when the switch lever 40 is slid, the slide bar 42 presses against the switch 41. As a result, the switch 41 is turned on and the motor 30 is driven by the controller 50. The slide bar 42 extends in the front-rear direction within the housing 20, and only the rear end of the slide bar 42 is shown in Figure 2.

[0032] (Regarding the handle housing 22) The handle housing 22 is made of resin and consists of two housing members that are divided in the left-right direction. The housing members of the handle housing 22 are fastened to each other, sandwiching the switch holding portion 21B from both the left and right sides. In this way, the handle housing 22 is connected to the motor housing 21. The front part of the handle housing 22 is configured as the handle portion 23 that the operator grips, and the rear part of the handle housing 22 is configured as the rear housing portion 24. The rear housing portion 24 protrudes from the handle portion 23 both vertically and horizontally. That is, the width dimension (horizontal dimension) of the rear housing portion 24 is set to be larger than the width dimension of the handle portion 23.

[0033] The rear housing portion 24 extends in a direction that slopes towards the rear as it moves upward when viewed from the left and right. In the following description, the direction in which the rear housing portion 24 extends when viewed from the left and right will be referred to as the slope direction (see arrows S1 and S2 in Figures 1 and 2), and the direction perpendicular to the slope direction will be referred to as the orthogonal direction (see arrows V1 and V2 in Figures 1 and 2). Also, the side in the direction of arrow S1 in Figures 1 and 2 will be considered one side of the slope direction, and the side in the direction of arrow V1 in Figures 1 and 2 will be considered one side of the orthogonal direction.

[0034] Multiple air intake ports 24A (see Figure 1) are formed through the left and right side walls of the rear housing portion 24. The air intake ports 24A are formed in the shape of elongated holes with the inclination direction as the longitudinal direction. A pair of filters 28 are detachably provided on the rear housing portion 24 at positions corresponding to the air intake ports 24A, and the filters 28 cover the air intake ports 24A from the outside in the left and right directions. This prevents foreign matter from entering the housing 20 from the air intake ports 24A. In addition, most of the outer circumference of the handle housing 22 is covered with a rubber portion 25 (see the gray-filled area in Figure 1) made of an elastic material such as rubber or elastomer, and the rubber portion 25 is formed integrally with the handle housing 22.

[0035] The rear housing section 24 houses the controller 50. The controller 50 consists of a controller board 51 and a controller case 52 that houses and holds the controller board 51. The controller case 52 is formed in the shape of a relatively shallow box that is open to one side in the orthogonal direction and is sandwiched from the outside in the left and right direction by the handle housing 22. The controller board 51 is formed in the shape of a substantially rectangular plate with the thickness direction in the orthogonal direction and is placed inside the controller case 52 and held by the controller case 52. The controller 50 is positioned between the left and right air intake ports 24A. As a result, when the fan 34 rotates, an airflow is generated that flows into the handle housing 22 from the air intake ports 24A, and this airflow passes through a hole (not shown) formed in the rear wall of the motor housing 21 and flows forward inside the motor housing 21, cooling the controller 50 and the motor 30.

[0036] At the rear end of the rear housing portion 24, a battery mounting portion 24B is provided on the other side perpendicular to the controller 50 for mounting the battery 44. The battery mounting portion 24B extends along the direction of inclination. The battery mounting portion 24B is formed in a concave shape that is open to one side in the direction of inclination and the other side perpendicular to it. The battery mounting portion 24B is provided with a terminal unit 45 that is connected to the battery 44, and the terminal unit 45 is assembled to the handle housing 22 by being sandwiched from the outside in the left and right directions by the handle housing 22. The terminal unit 45 is electrically connected to the controller 50. The battery 44, which serves as a power supply unit, is detachably mounted to the battery mounting portion 24B from one side in the direction of inclination, and power from the battery 44 is supplied to the controller 50 via the terminal unit 45.

[0037] A speed setting unit 46 is provided at the upper end of the rear housing 24 on one side in the direction of inclination of the controller 50. The speed setting unit 46 is configured as a mechanism for setting the target rotational speed of the motor 30. The speed setting unit 46 includes a rotary potentiometer 47 and an operating dial 48. The operating dial 48 is formed in a disc shape with its thickness direction approximately in the direction of inclination, and is configured to be rotatable with its axial direction approximately in the direction of inclination. A portion of the operating dial 48 is exposed to the rear housing 24 in one direction perpendicular to it so as to be operable. The rotary potentiometer 47 is configured as a rotary variable resistor and is electrically connected to the controller 50. The rotary potentiometer 47 is also connected to the operating dial 48 and outputs an output signal to the controller 50 according to the rotational position of the operating dial 48, and the controller 50 sets the rotational speed of the motor 30's rotation shaft 30A.

[0038] An operating section 60 is provided at the lower end of the rear housing section 24, on the other side of the inclination direction of the controller 50. The operating section 60 is configured as a mechanism for operating the lighting device 80, which will be described later. The operating section 60 includes an operating button 61 and an operating switch 62. The operating button 61 is exposed from the outer circumference of the rear housing section 24 so as to be pressable. The operating switch 62 is configured as a tactile switch or the like and is electrically connected to the controller 50. When the operating button 61 is pressed, the operating switch 62 is turned on, and an ON signal is output from the operating switch 62 to the controller 50.

[0039] (Regarding gear housing 27) As shown in Figures 3 and 4, the gear housing 27 is formed in a hollow shape that forms a roughly triangular shape when viewed from the left and right directions, and is open to the bottom and rear. A connecting portion 27A is formed at the rear end of the gear housing 27, and the connecting portion 27A is formed in a roughly rectangular cylindrical shape that corresponds to the enlarged diameter portion 21A of the motor housing 21. The connecting portion 27A and the enlarged diameter portion 21A are abutted together in the front-rear direction, and the outer circumference of the connecting portion 27A is fastened and fixed to the enlarged diameter portion 21A. A packing land 70 is provided on the lower side of the gear housing 27. That is, the open portion to the bottom of the gear housing 27 is closed (covered) by the packing land 70. The packing land 70 is formed in a two-stage stepped cylindrical shape with the vertical direction as the axial direction, and is fixed to the gear housing 27. Specifically, in the packing land 70, the outer diameter of the upper end is set to be larger than the outer diameter of the middle section in the vertical direction, and the outer diameter of the middle section in the vertical direction is set to be larger than the outer diameter of the lower end. The packing land 70 is fixed to the gear housing 27 by fixing screws 250. A retainer 26 is provided on the rear side of the gear housing 27. That is, the open portion to the rear of the gear housing 27 is closed (covered) by the retainer 26. The retainer 26 may cover the entire open portion to the rear of the gear housing 27, or it may cover only a part of it. The retainer 26 is a metal plate-shaped member and plays the role of pressing and positioning the second motor bearing 32 held in the gear housing 27 from the rear. The retainer 26 has a circular through hole in its center through which the rotating shaft 30A is inserted. In addition, ventilation holes are provided at the top and bottom of the retainer 26 through which airflow from the fan 34 passes. The retainer 26 may or may not be fixed to the gear housing 27. An exhaust port 27C is provided at the top of the gear housing 27. Also, the lower rear part of the gear housing 27 (especially the central part in the left-right direction) does not cover the motor housing 21 (retainer 26). As a result, a space is formed at the lower rear part of the gear housing 27 through which airflow from the fan 34 supplied from the motor housing 21 passes. Note that there may be no space for airflow at the lower rear part of the gear housing 27.The gear housing 27 has at least a transmission mechanism housing space for housing a reduction mechanism (a transmission mechanism including a pinion gear 33 and a bevel gear 74, which will be described later), and a ventilation space that communicates with the exhaust port 27C and through which airflow from the fan 34 passes. A handle mounting portion 102 (details will be described later) to which a side handle 29 can be attached is provided at the rear of the gear housing 27. The gear housing in this invention may include a packing land 70. The gear housing in this invention may also include a retainer 26.

[0040] A housing section 27D is provided in the gear housing 27. The housing section 27D is the part that houses the bevel gear 74. A spindle 71 is provided inside the housing section 27D, and the spindle 71 is formed in 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 housing 27, and the upper and lower middle part of the spindle 71 is rotatably supported by a bearing 73 fixed to the packing land 70. A bevel gear 74 is integrally rotatably provided on the upper end portion of the spindle 71, and the pinion gear 33 of the motor 30 meshes with the bevel gear 74. As a result, the driving force of the motor 30 is transmitted to the spindle 71 by the bevel gear 74. A grinding wheel 75 as a cutting tool is attached to the lower end of the spindle 71, and the grinding wheel 75 is formed in a substantially disc shape with the vertical direction as the thickness direction. As a result, the driving force of the motor 30 causes the grinding wheel 75 to rotate together with the spindle 71, thereby performing grinding and other processes on the workpiece. In other words, the spindle 71 and bevel gear 74 are configured as a transmission mechanism that transmits the driving force of the motor 30 to the grinding wheel 75. In addition, a wheel guard 76, which serves as a guard member, is detachably fixed to the lower end of the packing land 70. The rear of the grinding wheel 75 is covered by the wheel guard 76 from above and behind. Specifically, the wheel guard 76 is formed in a roughly semi-circular shape, and the outer circumference of the wheel guard 76 is bent downwards to cover the rear of the grinding wheel 75 from behind.

[0041] As shown in Figure 3, the rear of the gear housing 27 is provided with fixing screws 251, which serve as fasteners for fixing the gear housing 27 to the motor housing 21. There are four fixing screws 251. As shown in Figures 1 to 4, the rear of the gear housing 27 (the part behind the spindle 71) is provided with an exhaust port 27C (and an air passage space communicating with the exhaust port 27C), a handle mounting portion 102, and fixing screws 251 (a fixing structure to the motor housing 21), and at least a part of the lighting device of the present invention is also provided. The fixing screws 251 are provided at the ends in the vertical direction and the ends in the horizontal direction. That is, the fixing screws 251 are provided at the diagonal ends (corners) of the gear housing 27 when viewed in the front-rear direction. The exhaust port 27C is provided at or near the center position in the horizontal direction. The handle mounting portion 102 is provided near the center position in the vertical direction. The lighting device 80, described later, is installed in a location that avoids the area where the fixing screws 251, the exhaust port 27C (air passage), and the handle mounting portion 102 are located (it is supported by the gear housing 27 in the avoided position).

[0042] (Regarding lighting device 80) As will be described in detail later, the lighting device 80 (lighting device in the present invention) includes an LED 81 which serves as a light source, a lighting substrate 82 on which the LED 81 is mounted, wiring 83 for supplying power to the LED 81 (lighting substrate 82), and a holder 84 for holding the lighting substrate 82. As shown in Figures 1 and 3 to 10, at least a part of the lighting device 80 is provided on both the left and right sides of the housing 20. More specifically, a part of the lighting device 80 is positioned on the side of the housing 20 in the left-right direction, straddling the boundary between the motor housing 21 and the gear housing 27. More specifically, the holder 84 (details to be described later) included in the lighting device 80 is positioned to extend from a position overlapping the motor housing 21 to a position overlapping the gear housing 27 when viewed in the left-right direction. In addition, the front part of the lighting device 80 is exposed to the outside at the side (left and right side) of the rear end of the gear housing 27. Here, "exposed" means not covered. When viewed from the left, "exposed" means that the left side (or at least a part of it) of the lighting device 80 is not covered. When viewed from the front, "exposed" means that the front side (or at least a part of it) of the lighting device 80 is not covered. The lighting device 80 is positioned outward in the left-right direction from the housing section 27D. Therefore, the lighting device 80 is positioned outward in the left-right direction from the bevel gear 74. The pair of left and right lighting devices 80 are configured symmetrically with respect to the left-right center of the grinder 10. In other words, the left lighting device 80 and the right lighting device 80 are mirror images of each other in shape and configuration, and the shape and characteristics of one are the same as those of the mirror image part of the other. For this reason, the following explanation will focus on the left lighting device 80, and the explanation of the right lighting device 80 will be omitted as appropriate.

[0043] The lighting device 80 comprises an LED 81 as a light source (see Figure 8), a lighting substrate 82 on which the 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 housing 27 and the fan guide 35, and the front part of the holder 84 is exposed to the outside on both the left and right sides of the rear end of the gear housing 27. For this reason, the structure of the mounting parts for the lighting device 80 on the gear housing 27 and the fan guide 35 will be described first, followed by a description of each component of the lighting device 80. Note that the LED 81 and the lighting substrate 82 correspond to the light-emitting part of the present invention.

[0044] (Regarding the mounting section of Fan Guide 35) As shown in Figures 5 to 8, a rear mounting portion 90 for attaching the holder 84 of the lighting device 80 is formed on the left side of the fan guide 35. The rear mounting portion 90 is formed in a concave shape that opens to the front when viewed from the left side. A guide portion 91 is provided at the upper end of the rear mounting portion 90. The guide portion 91 is formed in a substantially rail shape that extends in the front-rear direction and is formed in a substantially inverted L shape when viewed from the front. Specifically, the guide portion 91 is composed of an upper wall 91A and a side wall 91B that extends downward from the left end of the upper wall 91A. The front part of the guide portion 91 protrudes forward from the front end of the fan guide 35. Ribs 91C (see Figure 6) are formed on both the left and right sides of the side wall 91B. The ribs 91C extend in the front-rear direction and are formed in a substantially triangular shape when viewed from the front (only the left rib 91C is shown in Figure 6).

[0045] 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-rear direction and is formed in a substantially U-shape that opens upward when viewed from the front. That is, the mounting rail portion 92 has a rail groove 92A as a first groove portion that opens upward and extends in the front-rear direction, with the front end of the rail groove 92A opening forward. Ribs 92B (see Figure 6) are integrally formed on both the left and right sides of the rail groove 92A, and the ribs 92B extend in the front-rear direction and are formed in a substantially triangular shape when viewed from the front (only the right rib 92B is shown in Figure 6).

[0046] (Regarding the mounting portion of the gear housing 27) As shown in Figures 1, 3, 5, 7, and 8, a front mounting portion 95 is formed on the left side of the rear end of the gear housing 27 for attaching the holder 84 of the lighting device 80 and exposing the holder 84 to the outside. The front mounting portion 95 is a recess (notch) that is recessed inward in the left-right direction. More specifically, the front mounting portion 95 is formed in the shape of a groove that extends in the front-rear direction and opens to the left, and is positioned adjacent to the rear diagonally lower side of the handle mounting portion 102, which will be described later. The front mounting portion 95 penetrates in the front-rear direction, and the rear end opening of the front mounting portion 95 is closed from the rear by the enlarged diameter portion 21A of the motor housing 21. The aforementioned rear mounting portion 90 is located behind the front mounting portion 95 when viewed from the left side. The upper surface of the front mounting portion 95 is inclined upward as it approaches the rear when viewed from the left side. The rear part of the front mounting portion 95 penetrates in the left-right direction. Due to the formation of the front mounting portion 95, the area of ​​the gear housing 27 that covers the motor housing 21 (front opening) is reduced.

[0047] A front engaging portion 96 is formed on the front of the upper surface of the front mounting portion 95, protruding downwards. The front engaging portion 96 is formed in a roughly triangular block shape when viewed from the left side, and its lower surface is positioned along a plane perpendicular to the vertical direction, and is positioned opposite the lower surface of the front mounting portion 95 in the vertical direction. The front engaging portion 96 is positioned one step lower to the right of the outer circumferential surface of the gear housing 27. An engaging groove portion 96A is formed at the corner of the rear end of the front engaging portion 96. The engaging groove portion 96A is formed in a concave shape that is open downwards and to the rear.

[0048] An upper overhang 97 is formed at the rear of the upper surface of the front mounting portion 95, extending downward. The upper overhang 97 is formed in a rib shape with the left-right direction being the thickness direction and extending in the front-rear direction. The upper overhang 97 is positioned one step lower to the right of the outer circumferential surface of the gear housing 27, and the left surface of the upper overhang 97 and the left surface of the front engaging portion 96 are flush with each other.

[0049] At the boundary between the lower end of the front mounting portion 95 and the outer circumference of the gear housing 27, a stepped portion 98 is formed that is lowered to the right. This stepped portion 98 extends in the front-rear direction and also penetrates in the front-rear direction.

[0050] (Regarding holder 84) As shown in Figures 1 and 3 to 9, the holder 84 of the lighting device 80 is made of a light-transmitting resin material. In this embodiment, the holder 84 is made of a transparent resin material. The holder 84 is composed of a holder body 85 which constitutes the front part of the holder 84 and a mounting piece 86 which constitutes the rear part of the holder 84. The mounting piece 86 is assembled to the fan guide 35, and the holder body 85 is assembled to the gear housing 27.

[0051] The holder body 85 is formed in a roughly L-shaped plate form, with the left-right direction being the thickness direction when viewed from the right side (see Figure 9). Specifically, the holder body 85 is composed of a first base portion 85A that constitutes the rear part of the holder body 85 and extends in the vertical direction, and a second base portion 85B that extends forward from the lower end of the first base portion 85A. The first base portion 85A has a substrate holding groove 85C for holding the lighting substrate 82, which will be described later. The substrate holding groove 85C extends in a direction that slopes slightly forward as it goes upward when viewed from the left-right direction, and the upper end of the substrate holding groove 85C is open upward. In addition, a stepped portion 85D is formed on the front part of the upper surface of the first base portion 85A, and the upper opening of the substrate holding groove 85C is formed in the stepped portion 85D. The substrate holding groove 85C is formed in a roughly T-shape when viewed in its longitudinal direction. Specifically, the substrate retaining groove 85C is composed of a substantially rectangular first retaining groove portion 85C1, whose longitudinal direction is the left-right direction when viewed from the longitudinal direction of the substrate retaining groove 85C, and a second retaining groove portion 85C2 that protrudes forward from the left-right center of the first retaining groove portion 85C1.

[0052] Furthermore, at the rear end of the first base portion 85A, a communication groove 85E is formed in the middle of the left-right direction, serving as a second groove for opening the substrate holding groove 85C to the rear. The communication groove 85E extends in the vertical direction, and its upper end is open upward.

[0053] The mounting piece 86 is formed in a substantially rectangular plate shape with the left-right direction being the thickness direction, and extends to the rear from the right end of the rear surface of the holder body 85. The left surface of the mounting piece 86 is flush with the right surface of the communication groove 85E. The lower end of the mounting piece 86 is inserted from the front into the rail groove 92A of the fan guide 35, and the mounting piece 86 is assembled to the fan guide 35. When the mounting piece 86 is assembled to the fan guide 35, the upper end of the mounting piece 86 is positioned adjacent to the right side of the side wall 91B of the guide portion 91 of the fan guide 35, and the front end of the guide portion 91 is inserted into the communication groove 85E of the holder 84. Furthermore, when the mounting piece 86 is assembled to the fan guide 35, the left and right pair of ribs 92B of the mounting rail portion 92 clamp the mounting piece 86 from the outside in the left and right directions, and the left and right sides of the communication groove 85E clamp the left and right pair of ribs 91C of the guide portion 91 from the outside in the left and right directions, thereby restricting the left and right movement of the holder 84. Moreover, when the mounting piece 86 is attached to the fan guide 35, the mounting piece 86 engages with the guide portion 91 and the mounting rail portion 92, restricting the vertical and rearward movement of the mounting piece 86. In other words, the mounting piece 86 is inserted from the front into the rear mounting portion 90 of the fan guide 35 and engages with the fan guide 35 in the vertical and left and right directions.

[0054] An engaging projection 85F is formed on the right end of the upper surface of the second base portion 85B of the holder body 85, in front of the first base portion 85A. The engaging projection 85F is formed in a substantially rectangular block shape and protrudes upward from the second base portion 85B. The holder body 85 is then inserted from the rear into the front mounting portion 95 of the gear housing 27 and assembled to the gear housing 27. When the holder body 85 is assembled to the gear housing 27, the engaging projection 85F is inserted from the rear into the engaging groove portion 96A of the front mounting portion 95, and the engaging projection 85F and the engaging groove portion 96A are engaged in the left-right direction (see Figure 8). Furthermore, when the holder body 85 is assembled to the gear housing 27, the holder body 85 engages with the front mounting portion 95 in the vertical direction, restricting the vertical movement of the holder body 85, and the holder body 85 is sandwiched in the front-rear direction by the gear housing 27 and the motor housing 21, restricting the front-rear movement of the holder 84.

[0055] A cover portion 85G is formed at the left end of the holder body 85, and the cover portion 85G is formed in a substantially trapezoidal plate shape with the left-right direction being the thickness direction. The external shape of the cover portion 85G when viewed from the left side corresponds to the shape of the front mounting portion 95, and the upper and lower ends of the cover portion 85G protrude outward in the vertical direction from the first base portion 85A and the second base portion 85B. When the holder body 85 is assembled to the gear housing 27, the outer circumference of the cover portion 85G is positioned close to the left side of the front engaging portion 96, the stepped portion 98, and the upper overhang portion 97 of the gear housing 27, and the cover portion 85G is visible from the left side of the gear housing 27. In other words, the cover portion 85G is configured as an external part that is exposed to the outside from the outer circumference of the gear housing 27. The holder 84 (part of the lighting device 80) is supported by the front mounting portion 95, thereby covering (closing) the portion of the motor housing 21 that was not covered by the gear housing 27. In other words, the front end opening of the motor housing 21 is configured to be closed off by the cooperation of the gear housing 27 and the holder 84. The predetermined area may be the entire area or just a part of it.

[0056] (Regarding the lighting board 82) As shown in Figures 8 and 9, the lighting substrate 82 is formed in a substantially elongated plate shape and is housed from above in the first retaining groove portion 85C1 of the substrate retaining groove 85C in the holder 84 and held by the holder 84. An LED 81 is provided on the front surface of the lighting substrate 82 and is positioned in the second retaining groove portion 85C2 of the holder 84. The LED 81 is electrically connected to the controller 50 via the lighting substrate 82. Specifically, wiring 83 extending from the lighting substrate 82 passes through the communication groove 85E and is positioned to the left of the mounting piece 86 (i.e., between the guide portion 91 and the mounting rail portion 92). The wiring 83 is also routed around the outer circumference of the fan guide 35 and extends to the rear on the radially outer side of the motor 30, and is electrically connected to the controller 50. The LED 81 is configured to emit light diagonally downwards and forwards. Specifically, the light emitted by the LED 81 passes through the inside of the holder body 85 and travels diagonally downward from the front end surface of the holder body 85 (second base portion 85B). In other words, light is projected diagonally downward from the LED 81 and the holder body 85.

[0057] The illumination device 80 is positioned behind the spindle 71 and overlapping the wheel guard 76 in the front-rear direction. It is also positioned above the wheel guard 76 and below the axis AL of the motor 30. Furthermore, it is positioned in a position that overlaps with the spindle 71 in the vertical direction (from the upper end to the lower end of the spindle 71). In addition, the front end of the holder 84 of the illumination device 80 is visible from the front. This allows the light emitted by the LED 81 to illuminate the area around the lower part of the spindle 71 from the rear and on the left-right outer sides of the spindle 71, illuminating the front of the grinding wheel 75.

[0058] (Regarding the protection mechanism 100) The protective mechanism 100 is provided around the lighting device 80 and is configured as a mechanism for protecting the lighting device 80. For example, if the left and right sides of the housing 20 are placed on a flat surface such as the ground, the protective mechanism 100 prevents the holder 84 of the lighting device 80, which is exposed to the outside of the housing 20, from coming into contact with the ground.

[0059] The protective mechanism 100 provided around the left-side lighting device 80 will be described first, followed by a description of the protective mechanism 100 provided around the right-side lighting device 80.

[0060] As shown in Figure 10, the protective mechanism 100 includes a handle mounting portion 102 as a front protective portion formed on the outer circumference of the gear housing 27, and a pair of upper and lower rear protective portions 104 as rear protective portions formed on the outer circumference of the motor housing 21. The handle mounting portion 102 is located diagonally upward and in front of the lighting device 80. Specifically, the handle mounting portion 102 is located adjacent to the front diagonally upward and in front of the front mounting portion 95. The handle mounting portion 102 is formed in a substantially cylindrical shape along a direction that slopes forward as it moves to the left, and protrudes to the left from the outer circumference of the gear housing 27. The rear end of the handle mounting portion 102 is positioned to overlap with the front part of the holder 84 in the lighting device 80 in a plan view, and protrudes to the left of the holder 84. A threaded portion 102A is provided on the inner circumference of the handle mounting portion 102, and a female thread is formed in the threaded portion 102A. The threaded portion 102A is configured such that the side handle 29 (see Figures 3 and 4) is screwed into it, and the side handle 29 (auxiliary handle) is attached to the gear housing 27. In other words, the handle mounting portion 102 is also configured as a mounting portion for attaching the side handle 29. When viewed from the front, the front end of the holder 84 is positioned adjacent to the underside of the handle mounting portion 102 and is visible and exposed.

[0061] The pair of upper and lower rear guard sections 104 are formed in a rib shape with the thickness in the vertical direction and are positioned close to the vertical outer side of the switch lever 40. That is, in the front-rear direction, the lighting device 80 (cover section 85G) is positioned between the handle mounting section 102 and the rear guard section 104. The rear guard section 104 extends rearward from the enlarged diameter section 21A of the motor housing 21, and the left end of the rear guard section 104 protrudes to the left of the enlarged diameter section 21A. The lower rear guard section 104 is positioned behind the lighting device 80 (cover section 85G), and the handle mounting section 102 is positioned between the pair of upper and lower rear guard sections 104 in the vertical direction. Also, in the left-right direction, the position of the left end of the rear guard section 104 and the position of the rear end of the handle mounting section 102 are approximately coincident. Therefore, when the housing 20 is placed on a flat surface such as the ground GR (see Figure 10) with its left side facing downwards (when the left side of the housing 20 is in contact with the ground), the rear end of the handle mounting portion 102 and the rear guard portion 104 come into contact with the ground, and the holder 84 of the lighting device 80, which is exposed to the outside of the housing 20, is positioned spaced apart to the right of the ground GR.

[0062] The protective mechanism 100 surrounding the right-side lighting device 80 omits the rear guard portion 104 compared to the protective mechanism 100 surrounding the left-side lighting device 80. That is, the protective mechanism 100 surrounding the right-side lighting device 80 consists only of the handle mounting portion 102. In the case of the right-side lighting device 80, contact with the ground GR is made by the handle mounting portion 102 and the enlarged diameter portion 21A. In addition, in the protective mechanism 100 surrounding the right-side lighting device 80, a pair of upper and lower rear guard portions 104 may be provided on the motor housing 21, so that the left and right protective mechanisms 100 are configured symmetrically.

[0063] (Effects and Benefits) Next, the operation and effects of the grinder 10 of this embodiment will be described.

[0064] When processing with the grinder 10 configured as described above, the operator grips the handle portion 23 of the housing 20 and operates the control dial 48 to set the rotation speed of the motor 30. Then, by sliding the switch lever 40 from the off position to the on position, the switch 41 is turned on, the motor 30 is driven, and the spindle 71 and grinding wheel 75 rotate. Thus, the grinder 10 can perform grinding and other processes on the workpiece.

[0065] Furthermore, lighting devices 80 are provided on both the left and right sides of the rear end of the gear housing 27, and the lighting devices 80 are positioned above the wheel guard 76. Specifically, the holder 84 of the lighting device 80 is exposed to the outer circumference of the gear housing 27 so that it is visible, and the holder 84 is positioned so that it is visible when viewed from the front. When the operator operates the control unit 60, the LED 81 of the lighting device 80 lights up, and the emitted light illuminates the area around the lower part of the spindle 71 (i.e., the grinding wheel 75). In other words, the housing 20 does not obstruct the light irradiated from the lighting devices 80 provided on both sides of the housing 20 toward the grinding wheel 75, and the grinding wheel 75 positioned around the lower part of the spindle 71 can be illuminated by this light. Therefore, the lower part of the spindle 71 (i.e., the grinding wheel 75) can be well illuminated. The lighting device 80 is configured to irradiate light downward and forward, and is therefore exposed to the front (its front side is not covered). The left-side lighting device 80 (holder 84) is also exposed to the left, allowing it to illuminate a wide area to the left, thereby improving visibility over a wide range. The right-side lighting device 80 can similarly illuminate a wide area to the right.

[0066] Furthermore, a protective mechanism 100 is provided around the lighting device 80 to protect it. Specifically, the gear housing 27 is provided with a handle mounting portion 102, which is positioned adjacent to the front and diagonally upper side of the holder 84 of the lighting device 80, and the rear end of the handle mounting portion 102 protrudes outward in the left-right direction from the lighting device 80. In addition, a rear guard portion 104 is provided on the left side of the motor housing 21, which is positioned behind the holder 84 of the lighting device 80 and protrudes outward in the left-right direction from the lighting device 80. As a result, for example, when the left side of the housing 20 is placed on a flat surface such as the ground GR, the handle mounting portion 102 and the rear guard portion 104 come into contact with the ground GR, and the holder 84 of the lighting device 80 is positioned spaced apart from the ground GR. This makes it possible to enhance the protective performance of the lighting device 80 even when the lighting device 80 is exposed to the outside of the housing 20. In other words, when the lighting device 80 is placed on a plane with the exposed side facing downwards, the lighting device 80 is configured to be spaced apart from the ground GR, thereby increasing the protective performance of the lighting device 80. In this embodiment, the lighting device 80 positioned on the left is exposed to the left, but even when placed on the ground GR with the left side facing downwards, the lighting device 80 is configured not to come into contact with the ground GR. That is, even if a plane extending in the front, back, up, and down directions is brought closer to the lighting device 80 in the left-right direction, the protective function (protrusion) provided on the housing 20 suppresses contact between the lighting device 80 and the plane. In this embodiment, the lighting device 80 is protected by the protruding handle mounting portion 102 and rear guard portion 104, but the lighting device 80 may also be positioned inward from the outer surface (outer shell) of the gear housing 27 or motor housing 21. In this case as well, the gear housing 27 or motor housing 21 is positioned (protrudes) outward relative to the lighting device 80, thus suppressing contact between the lighting device 80 and the ground GR. This configuration protects the lighting device 80, which can illuminate a wide area in the left-right direction.

[0067] Furthermore, as described above, the handle mounting portion 102 is positioned adjacent to the front-upper side of the holder 84 of the lighting device 80, and in a front view, a part of the holder 84 is positioned adjacent to the lower side of the handle mounting portion 102 and is visible and exposed. This allows the handle mounting portion 102 to be positioned close to the front of the lighting device 80 while suppressing the obstruction of the light emitted from the lighting device 80 towards the grinding wheel 75 by the handle mounting portion 102 (and the attached side handle 29). In other words, since the handle mounting portion 102 is positioned above the lighting device 80 which is configured to illuminate the front and lower, it is possible to suppress the obstruction of the light emitted from the lighting device 80 towards the grinding wheel 75 by the handle mounting portion 102. Thus, both the illumination performance of the lighting device 80 and the protective performance of the lighting device 80 can be achieved. In addition, since the lighting device 80 is positioned outward in the left-right direction from the housing portion 27D (bevel gear 74), it is possible to suppress the obstruction of forward light by the housing portion 27D. Although the light emitted from the left-side lighting device 80 in the rightward direction is blocked by the housing unit 27D, the right-side lighting device 80 emits light in the rightward direction, so the configuration is such that light is emitted in the leftward and rightward directions appropriately.

[0068] Furthermore, the handle mounting portion 102 is configured as a mounting portion for attaching the side handle 29 to the gear housing 27. Therefore, the lighting device 80 can be protected by utilizing the handle mounting portion 102 for attaching the side handle 29 to the gear housing 27. In other words, the side handle 29 can be attached to the gear housing 27 without affecting the illumination performance of the lighting device 80 on the grinding wheel 75.

[0069] Furthermore, the illumination device 80 is located behind the spindle 71 and outward in the left-right direction, and the holder 84 of the illumination device 80 is visible from the rear end of the gear housing 27. In addition, the illumination device 80 is positioned so as to overlap with the spindle 71 in the vertical direction (below the upper end of the spindle 71 and above the lower end). This suppresses an increase in the separation distance between the illumination device 80 and the grinding wheel 75, while allowing light from the illumination device 80 to be directed towards the grinding wheel 75 (around the spindle 71). Also, by providing the illumination device 80 at the rear end of the gear housing 27, the need to route the wiring 83 extending from the illumination device 80 within the gear housing 27 that houses the transmission mechanism such as the spindle 71 is reduced. This improves the workability when assembling the illumination device 80. As a result, the workability when assembling the illumination device 80 is improved, and the grinding wheel 75 can be illuminated even better.

[0070] Furthermore, in the lighting device 80, the mounting piece 86 of the holder 84 is attached to the fan guide 35 (inner member) which is housed in the motor housing 21 and assembled to the motor 30, and the holder body 85 of the holder 84 is attached to the gear housing 27. Therefore, the lighting device 80 can be assembled to the housing 20 by attaching the gear housing 27 to the motor housing 21 while the lighting device 80 is temporarily assembled to the fan guide 35. In this way, one end of the lighting device 80 in the front-rear direction is supported by the motor housing 21, and the other end is supported by the gear housing 27. As a result, the lighting device 80 is supported at two points, front and rear, so that the lighting device 80 is firmly supported and wobbling of the lighting device 80 can be suppressed. If the lighting device 80 wobbles, dust may enter through the gaps, so firmly supporting the lighting device 80 is also effective in ensuring airtightness. Furthermore, in the grinder 10, since the fan guide 35 is a particularly large diameter component, it is important to position the lighting device 80 (LED 81) in front of the fan guide 35. This is adequately addressed by using the fan guide 35 as a support member for the lighting device 80. Note that the inner member does not have to be the fan guide 35; for example, it may be configured to be assembled to the insulator of the motor 30, which is also an annular component. In the grinder 10, the fan guide 35 is located immediately behind the gear housing 27, so it is used as a support for the lighting device 80. However, other components may be used as inner members to support the lighting device 80 if they are in a similar positional relationship.

[0071] Furthermore, when the lighting device 80 is assembled to the housing 20, the holder 84 (holder body 85) of the lighting device 80 is sandwiched in the front-to-back direction by the front mounting portion 95 of the gear housing 27 and the front end of the motor housing 21. As a result, as described above, the lighting device 80 can be assembled to the housing 20 by attaching the gear housing 27 to the motor housing 21, which houses the motor 30, from the front. In other words, by assembling the gear housing 27 to the motor housing 21, the positioning of the lighting device 80 (especially its movement in the forward and left-right directions) can be controlled, resulting in good assembly efficiency.

[0072] Furthermore, the lower end of the mounting piece 86 of the holder 84 in the lighting device 80 is inserted from the front into the rail groove 92A of the fan guide 35, and the rail groove 92A and the mounting piece 86 are engaged in the left-right direction. As a result, the lighting device 80 can be assembled to the fan guide 35 by inserting the mounting piece 86 into the rail groove 92A of the fan guide 35. This improves the ease of assembly of the lighting device 80 to the fan guide 35 and allows the lighting device 80 to be assembled to the fan guide 35 with a simple configuration. The holder body 85 is composed of a first base portion 85A that holds the LED 81 and a second base portion 85B that extends forward from the first base portion 85A. The light from the LED 81 is projected forward from the front end of the second base portion 85B. With this configuration, the light projection opening can be easily changed by adjusting the position of the LED 81. Therefore, the forward light projection range can be adjusted by extending the second base portion 85B further forward.

[0073] Furthermore, the fan guide 35 has a guide portion 91 formed thereon, which is positioned adjacent to the left-right outer side of the upper end of the mounting piece 86 of the holder 84. This allows the guide portion 91 to guide the mounting piece 86 when inserting it into the fan guide 35. Thus, the ease of assembling the holder 84 to the fan guide 35 can be further improved. In addition, the holder 84 has a communication groove 85E formed thereon, and the front end of the guide portion 91 is inserted into the communication groove 85E, so that the guide portion 91 and the holder 84 are engaged in the left-right direction. As a result, the holder 84 is engaged with the fan guide 35 at two locations, upper and lower. Therefore, the assembled state of the holder 84 to the fan guide 35 can be maintained well.

[0074] Furthermore, in the lighting device 80, the wiring 83 extending from the lighting substrate 82 is positioned on the left-right outer side of the mounting piece 86. That is, the wiring 83 is positioned between the guide portion 91 and the mounting rail portion 92 of the fan guide 35. This allows the wiring extending from the lighting substrate 82 to the rear to be routed to the rear controller 50 while maintaining good routing conditions with the guide portion 91 and the mounting rail portion 92.

[0075] Furthermore, the gear housing 27 has a front mounting portion 95 into which the holder body 85 of the holder 84 is inserted. The front mounting portion is formed in the shape of a groove that is open to the front and outward in the left-right direction. This allows the light emitted by the LED 81 to illuminate the holder 84 from the front end, while the inner circumferential surface of the front mounting portion 95 covers the holder body 85 from both the top and bottom directions. Therefore, the holder 84 can be protected from both the top and bottom directions by the gear housing 27 while ensuring the illumination performance of the lighting device 80. In addition, the front mounting portion 95 is grooved and configured to allow a part of the lighting device 80 to be inserted through the front end opening of the motor housing 21. In other words, the front end opening of the motor housing 21 is closed by the cooperation of the gear housing 27 and the holder 84, so that the motor housing 21 can maintain its conventional shape. Note that the front mounting portion 95 does not necessarily need to be open in the left-right direction. For example, the front mounting portion 95 only needs to be configured so that the holder 84 can be inserted in the front-rear direction, and it may also be a through hole in the front-rear direction. In this case, the holder 84 is at least partially covered by the gear housing 27 in the left-right direction, thereby improving the protective performance of the holder 84. Also, in this case, the illumination device 80 becomes visible from the front-rear direction due to the opening of the hole that penetrates in the front-rear direction, so that light can be suitably projected forward.

[0076] Furthermore, an engagement groove 96A is formed in the front mounting portion 95 of the gear housing 27, and the engagement projection 85F of the holder 84 is inserted into the engagement groove 96A, so that the gear housing 27 and the holder 84 are engaged in the left-right direction. This makes it possible to maintain a good assembled state of the holder 84 (lighting device 80) to the gear housing 27.

[0077] (Regarding variation 1 of the arrangement of lighting device 80) Next, variation 1 of the arrangement of the lighting device 80 will be described using Figure 11. As shown in this figure, in variation 1 of the arrangement of the lighting device 80, the lighting device 80 is provided on both the left and right sides of the front end of the motor housing 21. Specifically, a cover portion 21C is formed at the front end of the motor housing 21, which protrudes outward in the left and right directions and is open to the front. The lighting device 80 is provided inside the cover portion 21C. That is, the front end opening of the motor housing 21 is larger than that of the first embodiment due to the formation of the cover portion 21C, and even if the gear housing 27 does not have a front mounting portion 95 (recess), the cover portion 21C cannot be closed. Instead, the lighting device 80 covers the cover portion 21C, and as a result, the gear housing 27 and the lighting device 80 cooperate to close the front end opening of the motor housing 21, similar to the first embodiment.

[0078] Similar to this embodiment, the lighting device 80 is positioned above the wheel guard 76 and below the axis AL of the motor 30, and is positioned to overlap with the spindle 71 in the vertical direction. Furthermore, when viewed from the front, the holder 84 of the lighting device 80 is positioned on the left-right outer and lower side of the handle mounting portion 102 and is visible and exposed.

[0079] Then, the light emitted by the LED 81 (not shown) of the lighting device 80 is projected from the front end surface of the holder 84 diagonally downward, and this light illuminates the area around the lower part of the spindle 71 (i.e., the grinding wheel 75). As a result, even in variation 1, the housing 20 does not obstruct the light projected from the lighting devices 80 provided on both sides of the housing 20 toward the grinding wheel 75, and this light illuminates the grinding wheel 75 positioned around the lower part of the spindle 71.

[0080] Furthermore, in Variation 1, the illumination device 80 is located behind the spindle 71 and outward in the left-right direction, and the holder 84 of the illumination device 80 is exposed so as to be visible from the front end of the motor housing 21. That is, the illumination device 80 is provided on both sides of the housing 20 so as to be visible from the front through the front opening (cover portion 21C) provided in the housing 20, and is positioned so as to overlap with the wheel guard 76 in the front-rear direction. Therefore, even in Variation 1, it is possible to suppress an increase in the distance between the illumination device 80 and the grinding wheel 75, and it is no longer necessary to route the wiring 83 extending from the illumination device 80 into the gear housing 27 that houses the transmission mechanism such as the spindle 71. As a result, even in Variation 1, the grinding wheel 75 can be illuminated even better while improving the workability when assembling the illumination device 80.

[0081] Furthermore, in variation 1, the holder 84 of the lighting device 80 is covered by the cover portion 21C of the motor housing 21. This improves the protective performance of the lighting device 80.

[0082] (Regarding variation 2 of the arrangement of lighting device 80) Next, variation 2 of the arrangement of the lighting device 80 will be described using Figure 12. As shown in this figure, in variation 2 of the arrangement of the lighting device 80, the lighting device 80 is provided on both the left and right sides of the front end of the motor housing 21. Specifically, an exposed portion 21D for exposing the lighting device 80 is formed on the side of the front end of the motor housing 21, and the exposed portion 21D is cut out in a concave shape that opens to the front. In addition, a groove portion 27B is formed on the outer circumference of the gear housing 27 in front of the exposed portion 21D, extending in the front-rear direction and opening outward in the left-right direction. The groove portion 27B penetrates in the front-rear direction, and the front end of the holder 84 of the lighting device 80 is exposed by the groove portion 27B so that it can be seen from the front.

[0083] Similar to this embodiment, the lighting device 80 is positioned above the wheel guard 76 and below the axis AL of the motor 30, and is positioned to overlap with the spindle 71 in the vertical direction. Furthermore, when viewed from the front, the holder 84 of the lighting device 80 is positioned below the handle mounting portion 102 and is visible and exposed.

[0084] Then, the light emitted by the LED 81 (not shown) of the lighting device 80 is shone from the front end surface of the holder 84 diagonally downward, and this light illuminates the area around the lower part of the spindle 71 (i.e., the grinding wheel 75). As a result, even in variation 2, the housing 20 does not obstruct the light shone from the lighting devices 80 provided on both sides of the housing 20 toward the grinding wheel 75, and this light can illuminate the grinding wheel 75 positioned around the lower part of the spindle 71.

[0085] In variation 2, the illumination device 80 is located behind the spindle 71 and outward in the left-right direction, and the holder 84 of the illumination device 80 is exposed so as to be visible from the front end of the motor housing 21. That is, the illumination device 80 is provided on both sides of the housing 20 and is positioned to overlap with the wheel guard 76 in the front-rear direction. Therefore, in variation 2 as well, it is possible to suppress an increase in the distance between the illumination device 80 and the grinding wheel 75, and it is no longer necessary to route the wiring 83 extending from the illumination device 80 into the gear housing 27 that houses the transmission mechanism such as the spindle 71. As a result, in variation 2 as well, it is possible to illuminate the grinding wheel 75 even better while improving the workability when assembling the illumination device 80. In addition, in variation 2, it is no longer necessary to provide a structure to support the illumination device 80 on the gear housing 27 side, so it can be realized with a simpler configuration.

[0086] In variation 2, the lighting device 80 is also positioned between the handle mounting portion 102 and the rear guard portion 104. This allows the lighting device 80 to be protected by the protective mechanism 100.

[0087] (Regarding variation 3 of the arrangement of lighting device 80) Next, variation 3 of the arrangement of the lighting device 80 will be described using Figure 13. As shown in this figure, in variation 3 of the arrangement of the lighting device 80, the front end of the motor housing 21 in the grinder 10 is formed by a frame-shaped spacer 110, and the lighting device 80 is provided on both the left and right sides of the spacer 110. Specifically, an exposed portion 110A for exposing the lighting device 80 is formed on the side of the spacer 110, and the exposed portion 110A is cut out in a concave shape that opens to the front, similar to the exposed portion 21D in variation 2. Also, on the outer circumference of the gear housing 27, similar to variation 2, a groove portion 27B is formed in front of the exposed portion 110A, extending in the front-rear direction and opening outward in the left-right direction. The groove portion 27B penetrates in the front-rear direction, and the front end of the holder 84 of the lighting device 80 is exposed by the groove portion 27B so that it can be seen from the front.

[0088] Similar to this embodiment, the lighting device 80 is positioned above the wheel guard 76 and below the axis AL of the motor 30, and is positioned to overlap with the spindle 71 in the vertical direction. Furthermore, when viewed from the front, the holder 84 of the lighting device 80 is positioned below the handle mounting portion 102 and is visible and exposed.

[0089] Then, 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 diagonally downward, and this light illuminates the area around the lower part of the spindle 71 (i.e., the grinding wheel 75). As a result, even in variation 3, the housing 20 does not obstruct the light irradiated from the lighting devices 80 provided on both sides of the housing 20 toward the grinding wheel 75, and this light can illuminate the grinding wheel 75 positioned around the lower part of the spindle 71.

[0090] Furthermore, in variation 3, the illumination device 80 is located behind the spindle 71 and outward in the left-right direction, and the holder 84 of the illumination device 80 is visible from the spacer 110 between the motor housing 21 and the gear housing 27. That is, the illumination device 80 is provided on both sides of the housing 20 and is positioned to overlap with the wheel guard 76 in the front-rear direction. Therefore, in variation 3 as well, the separation distance between the illumination device 80 and the grinding wheel 75 is suppressed, and it is no longer necessary to route the wiring 83 extending from the illumination device 80 into the gear housing 27 that houses the transmission mechanism such as the spindle 71. As a result, in variation 3 as well, the grinding wheel 75 can be illuminated even better while improving the workability when assembling the illumination device 80.

[0091] In variation 3, the lighting device 80 is also positioned between the handle mounting portion 102 and the rear guard portion 104. This allows the lighting device 80 to be protected by the protective mechanism 100. Variation 3 is characterized by the fact that the lighting device 80 is held by an additional spacer 110, but the holding structure may also be such that the lighting device 80 is held by cover portions that protrude to the left and right, as in variation 1. This makes it possible to mount the lighting device 80 without changing the shape of the motor housing 21 and the gear housing 27 from the conventional design (without providing cutouts, etc.).

[0092] (Regarding variation 4 of the arrangement of lighting device 80) Next, variation 4 of the arrangement of the lighting device 80 will be described using Figures 14 and 15. As shown in these figures, in variation 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.

[0093] In a side view, the lighting device 80 is positioned above the wheel guard 76 and below the axis AL of the motor 30, and in the vertical direction, it is positioned to overlap with the spindle 71. Also, when viewed from the front, the holder 84 of the lighting device 80 is positioned on the left-right outer side of the lower end of the gear housing 27 and is visible (see Figure 14).

[0094] Then, the light emitted by the LED 81 (not shown) of the lighting device 80 is projected forward from the front end surface of the holder 84, and the area around the lower part of the spindle 71 (i.e., the grinding wheel 75) is illuminated by this light. As a result, even in variation 4, the housing 20 does not obstruct the light projected from the lighting devices 80 provided on both sides of the housing 20 toward the grinding wheel 75, and the grinding wheel 75, which is positioned around the lower part of the spindle 71, can be illuminated by this light.

[0095] In the first embodiment, the lighting device 80 is provided on both the left and right sides of the housing 20, but it may also be configured to be provided on only one of the left or right sides of the housing 20.

[0096] Furthermore, in the first embodiment, the rear part of the holder 84 of the lighting device 80 is assembled to the fan guide 35, but the rear part of the holder 84 may be configured to be assembled to the front end of the motor housing 21.

[0097] (Second Embodiment) Next, the disc grinder 200 (hereinafter simply referred to as the grinder 200) as a work machine according to the second embodiment will be described using Figures 16 to 20. This embodiment could be called variation 5 in the sense that the arrangement of the lighting device is different, but it will be described as the second embodiment of the present invention because there are many differences from the first embodiment. The grinder 200 of the second embodiment is configured the same as the grinder 10 of the first embodiment, except for the points shown below. In Figures 16 to 20, the same reference numerals are used for components that are configured the same as those of the grinder 10 of the first embodiment.

[0098] In the grinder 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 casing (at least a part of it) of the lighting device 210 and is configured as a member that houses and holds LEDs 232 and 234, etc., which will be described later. The holder 212 is composed of a pair of left and right second holding parts, which are relay holders 214, and a first holding part, which is a light-transmitting holder 216. The lighting device 210 also has a holder cover 240 that covers the light-transmitting holder 216 from above.

[0099] The pair of intermediate holders 214 are made of resin. The pair of intermediate holders 214 are configured substantially the same as the holder 84 of the first embodiment, with the rear of the intermediate holder 214 being assembled to the rear mounting portion 90 of the fan guide 35 (not shown). That is, the intermediate holder 214 is located outward in the left-right direction from the spindle 71. The front of the intermediate holder 214 protrudes forward from both left-right ends of the enlarged diameter portion 21A of the motor housing 21, which is the first housing, and is positioned within the front mounting portion 95 of the gear housing 27. The intermediate holder 214 is sandwiched from both the front and rear sides by the front end edge of the enlarged diameter portion 21A of the motor housing 21 and the front mounting portion 95 of the gear housing 27, thereby restricting its movement in the front-rear direction. In addition, the front end of the intermediate holder 214 protrudes forward so as to be positioned below the handle mounting portion 102.

[0100] Although not shown in the illustration, in the second embodiment as well, when the housing 20 is placed on a flat surface such as the ground with its left side facing downwards, the rear end of the handle mounting portion 102 and the rear guard portion 104 come into contact with the ground, and the relay holder 214 is positioned spaced apart to the right of the ground.

[0101] A terminal 220 (see Figures 16 and 17) is embedded in the front of the relay holder 214. The terminal 220 extends in the front-rear direction, and its front end bends downward, protruding downward from the front end of the relay holder 214. A wiring harness 226 (see Figures 17 and 20) is connected to the rear end of the terminal 220. The wiring harness 226 extends rearward from the terminal 220 and is electrically connected to the controller 50.

[0102] The light-transmitting holder 216, like the holder 84 of the first embodiment, is made of a light-transmitting resin material (transparent resin material). The light-transmitting holder 216 is provided below the upper end of the packing land 70 and radially outward of the middle part of the packing land 70 in the vertical direction, and is fastened and fixed to the gear housing 27 together with the holder cover 240 and the packing land 70, which will be described later. That is, the light-transmitting holder 216 is located below the gear housing 27 and the intermediate holder 214.

[0103] The translucent holder 216 is formed in a substantially annular shape overall and is also formed in a concave shape that opens upward. When the translucent holder 216 is fixed to the gear housing 27, the upper and lower intermediate portion of the packing land 70 is positioned inside the translucent holder 216. That is, the translucent holder 216 is positioned along the circumferential direction of the packing land 70 so as to surround the upper and lower intermediate portion of the packing land 70 on the radially outer side of the spindle 71, and is exposed so as to be visible from both the front and left and right sides. Furthermore, the translucent holder 216 is positioned above the grinding wheel 75 and the wheel guard 76. In the second embodiment, the gear housing 27 and the packing land 70 are the second housing of the present invention, and the gear housing 27 and the packing land 70 correspond to the divided members of the present invention, respectively.

[0104] The front and rear ends of the light-transmitting holder 216 are each formed with a pair of left and right fixing parts 216A, which are positioned one step above the lower surface of the light-transmitting holder 216. Fixing holes 216B (see Figure 20) are formed through the fixing parts 216A in the vertical direction. The light-transmitting holder 216 is also provided with metal sleeves 218 (see Figure 20) at positions corresponding to the fixing parts 216A, and the sleeves 218 are formed in a substantially cylindrical shape with the vertical direction as the axial direction. The lower end of the sleeve 218 is fitted into the fixing hole 216B, and the sleeve 218 protrudes upward from the fixing part 216A. The light-transmitting holder 216 is then positioned below the upper end of the packing land 70, and fixing screws 250, which serve as fasteners, are inserted into the sleeves 218 from below, and the light-transmitting holder 216 is fastened and fixed to the gear housing 27 together with the packing land 70 by the fixing screws 250. Furthermore, when the light-transmitting holder 216 is fixed to the gear housing 27, the outer shape of the light-transmitting holder 216 is set so that, in a plan view, the holder 212 does not protrude from the gear housing 27.

[0105] A pair of left and right relay connecting portions 216C are provided at the rear end of the light-transmitting holder 216. The relay connecting portions 216C extend outward from the light-transmitting holder 216 in the left and right directions at a position rearward of the spindle 71, and the longitudinal middle portion of the relay connecting portion 216C is bent upward. The tip of the relay connecting portion 216C is positioned adjacent to the lower side of the front end of the relay holder 214. A connector 222 is provided inside the tip of the relay connecting portion 216C, and the front end of the terminal 220 is connected to the connector 222.

[0106] Three illumination boards 230 are housed within the light-transmitting holder 216. One illumination board 230 is positioned in the left-right center of the front end of the light-transmitting holder 216, with the front-to-back direction being the thickness direction, and is held by the light-transmitting holder 216. An LED 232, which serves as a light source, is provided on the front surface of this illumination board 230. The LED 232 is positioned in front of the spindle 71 and is configured to project the emitted light forward. The LED 232 is positioned so as to overlap with the spindle 71 when viewed from the front, and so as to overlap with the gear housing 27 when viewed from above.

[0107] The other two lighting substrates 230 are positioned within the intermediate portions in the front-to-back direction at both the left and right ends of the light-transmitting holder 216, with the left-to-right direction being the thickness direction, and are held by the light-transmitting holder 216. LEDs 234, which serve as light sources, are provided on the left-to-right outer surfaces of the left and right lighting substrates 230. The LEDs 234 are positioned to be outward in the left-to-right direction from the spindle 71, and the emitted light is directed outward in the left-to-right direction. Furthermore, the LEDs 234 are positioned to overlap with the spindle 71 when viewed from the left-to-right direction, and to overlap with the gear housing 27 when viewed from above. The lighting substrates 230 and LEDs 232, and the lighting substrates 230 and LEDs 234, correspond to the light-emitting parts of the present invention.

[0108] LEDs 232 and 234 are connected in series by wiring 224 routed within the light-transmitting holder 216, and are also connected to connector 222. This electrically connects LEDs 232 and 234 to controller 50, and under the control of controller 50, power is supplied to LEDs 232 and 234 from battery 44 (power supply unit), causing LEDs 232 and 234 to light up. Terminal 220, connector 222, and wiring 224 correspond to the connection parts of the present invention.

[0109] The holder cover 240 is formed in a substantially annular plate shape with the vertical direction being the thickness direction, and the shape of the holder cover 240 is formed to correspond to the outer shape of the light-transmitting holder 216. The holder cover 240 closes the opening of the holder 212, and the holder cover 240 is sandwiched vertically between the holder 212 and the packing land 70. The holder cover 240 has a through hole 240A through which the upper end of the sleeve 218 is inserted. Furthermore, a connecting cover portion 240B corresponding to the relay connecting portion 216C is formed at the rear end of the holder cover 240. The connecting cover portion 240B extends outward from the holder cover 240 in the left-right direction and is bent upward. The aforementioned connector 222 is held at the tip of the connecting cover portion 240B.

[0110] 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 is irradiated forward from the front end surface of the light-transmitting holder 216, illuminating the front side surrounding the lower part of the spindle 71 (i.e., the grinding wheel 75). In addition, the light emitted by the LED 234 of the lighting device 210 passes through the light-transmitting holder 216 and is irradiated outward in the left and right directions from both the left and right sides of the light-transmitting holder 216, illuminating the left and right sides surrounding the lower part of the spindle 71 (i.e., the grinding wheel 75). Thus, even in the second embodiment, the housing 20 does not obstruct the light irradiated from the lighting device 210 provided in the housing 20 toward the grinding wheel 75, and the grinding wheel 75, which is positioned around the lower part of the spindle 71, can be illuminated by this light.

[0111] Furthermore, in the lighting device 210 of the second embodiment, the light-transmitting holder 216 that holds the LEDs 232 and 234 is arranged radially outward of the spindle 71, surrounding the spindle 71. Therefore, the LEDs 232 and 234 can be placed at any position radially outward of the spindle 71 to illuminate the grinding wheel 75 arranged around the lower part of the spindle 71. In addition, the LEDs 232 and 234 emit light that is directed radially outward (towards the front and outward in the left and right directions) of the spindle 71. Therefore, it is possible to prevent the spindle 71 from blocking the light emitted from the LEDs 232 and 234. As a result, the area around the grinding wheel 75 can be effectively illuminated.

[0112] In particular, in the second embodiment, since the LED 232 is located in front of the spindle 71, when machining using the front part of the grinding wheel 75, the area around the front part of the grinding wheel 75 can be effectively illuminated. Also, since the LED 234 is located on the left and right outer sides of the spindle 71, when machining using the left and right outer ends of the grinding wheel 75, both left and right sides of the grinding wheel 75 can be effectively illuminated. This further improves the workability of the grinder 200.

[0113] Furthermore, the light-transmitting holder 216 is positioned to surround the vertically intermediate portion of the packing land 70 from the radially outer side, and is located above the grinding wheel 75. In addition, the LEDs 232 and 234 overlap with the gear housing 27 when viewed from above. This allows for effective illumination of the area around the grinding wheel 75 by the LEDs 232 and 234 while suppressing an increase in the size of the light-transmitting holder 216.

[0114] Furthermore, in the lighting device 210 of the second embodiment, the holder 212 has 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 toward the rear is restricted by the motor housing 21, and the movement of the relay holder 214 toward the front is restricted by the gear housing 27. This allows the relay holder 214 to be fixed to the housing 20 with a simple configuration. The light-transmitting holder 216 is positioned on the underside of the gear housing 27 and is fixed to the gear housing 27 together with the packing land 70 by fixing screws 250. This allows the light-transmitting holder 216 to be fixed to the gear housing 27 while suppressing an increase in the number of parts. In addition, because the light-transmitting holder 216 is positioned on the underside of the gear housing 27, it is not necessary to route the wiring 224 for connecting the LEDs 232 and 234 inside the gear housing 27 which houses the transmission mechanism such as the spindle 71. This improves the workability when assembling the light-transmitting holder 216 while providing good illumination around the grinding wheel 75.

[0115] Furthermore, the light-transmitting holder 216 is positioned below the upper end of the packing land 70 and surrounding the middle section of the packing land 70 in the vertical direction. The outer shape of the light-transmitting holder 216 is set so that, when viewed from above, the light-transmitting holder 216 does not protrude beyond the gear housing 27. This allows the LEDs 232 and 234 to be positioned radially outward from the spindle 71 while suppressing an increase in the overall size of the grinder 200.

[0116] In the second embodiment, the terminal 220 is held by the relay holder 214 and connected to the connector 222, thereby electrically connecting the controller 50 with the LEDs 232 and 234. However, the method of connecting the controller 50 with the LEDs 232 and 234 is not limited to this. For example, a circuit board having a relay connector or the like connected to the connector 222 may be held by the relay holder 214, thereby electrically connecting the controller 50 with the LEDs 232 and 234. [Explanation of Symbols]

[0117] 10... Disc grinder (working tool), 20... Housing, 21... Motor housing (first housing), 27... Gear housing (second housing, divided part), 30... Motor, 35... Fan guide (inner part), 44... Battery (power supply unit), 70... Packing land (second housing, divided part), 71... Spindle, 75... Grinding wheel (cutting tool), 76... Wheel guard (guard part), 80... Lighting device, 81... LED (light source), 82... Lighting circuit board, 83... Wiring, 84... Holder, 85E... Communication groove (second groove section) 86…Mounting piece (rear of holder), 91…Guide section, 92A…Rail groove (first groove section), 950…Protection mechanism, 102…Handle mounting section (front protection section), 104…Rear guard section (rear protection section), 200…Disc grinder (working machine), 210…Lighting device, 212…Holder, 214…Intermediate holder (second holding section), 216…Translucent holder (first holding section), 220…Terminal (connection section), 222…Connector (connection section), 224…Wiring (connection section), 232…LED (light source), 234…LED (light source), 250…Fixing screw (fixing device)

Claims

1. A motor that rotates around an axis in the front-to-back direction, A housing comprising a motor housing for housing the motor and a gear housing positioned in front of the motor housing, A spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part, A guard member is attached to the gear housing and covers at least a portion of the tip tool, A lighting device extending from inside the motor housing such that at least a portion of it passes outside the gear housing, Equipped with, The lighting device is located above the guard member and at least one of the left and right sides of the housing, and has a light-emitting unit that emits light from a position behind the spindle toward the area around the lower part of the spindle, in a work machine.

2. A motor that rotates around an axis in the front-to-back direction, A housing comprising a motor housing for housing the motor and a gear housing positioned in front of the motor housing, A spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part, A guard member is attached to the gear housing and covers at least a portion of the tip tool, An illumination device supported inside the motor housing or on the outer surface of the gear housing, which irradiates light from a position below the motor axis so as to illuminate the area around the lower part of the spindle, Equipped with, The housing has at least one of the following: a protrusion provided on at least one of the left and right sides of the motor housing so as to protrude from the outer casing of the gear housing when viewed from the front of the housing, or a recess provided on at least one of the left and right sides of the gear housing. The convex portion and the concave portion, respectively, prevent a portion of the front end of the motor housing from being covered by the gear housing when viewed from the front. A work machine in which, when viewed from the front, the light-emitting portion of the lighting device is positioned to overlap with a portion of the front end of the motor housing, making it visible.

3. The work machine according to claim 1 or claim 2, further comprising a protective mechanism to suppress contact between a flat surface such as the ground or floor and the lighting device when the lighting device is brought close to the flat surface in the left-right direction.

4. The work machine according to claim 3, wherein the lighting device is configured to be visible even when viewed from the front, and the protective mechanism is configured to protrude outward from the housing more than the lighting device.

5. A motor that rotates about an axis in the front-rear direction, A housing comprising a first housing for housing the motor and a second housing positioned in front of the first housing, A spindle supported by the second housing, which rotates when the driving force of the motor is transmitted to it, and to which a cutting tool tip is detachably attached, An illumination device having a light-emitting part that extends from inside the first housing such that at least a portion of it passes outside the second housing and is provided on one side of the housing in the left-right direction, and irradiates light from the light-emitting part toward the area around the lower part of the spindle, A protective mechanism is provided to suppress contact between the lighting device and a flat surface such as the ground or floor when the lighting device is brought close to the ground or floor in the left-right direction. Equipped with, The protective mechanism is configured to protrude further outward from the housing than the lighting device and includes a front protective part located in front of the light-emitting part and a rear protective part located behind the light-emitting part. A work machine in which a part of the aforementioned lighting device is located below the front protective part.

6. The work machine according to claim 1 or claim 2, wherein the lighting device is located above the tip tool and behind and outward in the left-right direction from the spindle.

7. The work machine according to claim 6, wherein the lighting device is visible from the outer circumference of the left and right sides of the gear housing.

8. A motor that rotates about an axis in the front-rear direction, A housing comprising a motor housing for housing the motor and a gear housing positioned in front of the motor housing, A spindle supported by the gear housing, which rotates when the driving force of the motor is transmitted to it, and to which a cutting tool is detachably attached, An illumination device is provided, at least in part, on at least one of the left and right sides of the housing, and extends from inside the motor housing so as to pass outside the gear housing, and irradiates light toward the area around the lower part of the spindle. Equipped with, The aforementioned lighting device is A light-emitting unit having a light source, A holder for holding the light-emitting part, It consists of, The rear of the holder is connected to the motor housing or an inner member housed in the motor housing. A work machine in which the front part of the holder is connected to the gear housing.

9. The rear portion of the holder is attached to the inner member which is mounted to the motor. The work machine according to claim 8, wherein the holder is sandwiched in the front-rear direction by the gear housing and the motor housing.

10. A motor that rotates around an axis in the front-to-back direction, A housing comprising a motor housing for housing the motor and a gear housing positioned in front of the motor housing, A spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part, A guard member is attached to the gear housing and covers at least a portion of the tip tool, A handle mounting portion is provided on one side of the gear housing in the left-right direction, and to which a side handle that can be gripped by an operator can be attached, An illumination device having a light-emitting part located above the guard member and below the handle mounting part, which emits light from one side in the left-right direction toward the periphery of the lower part of the spindle, Equipped with, The handle mounting portion of the work machine has a portion that protrudes to one side in the left-right direction from at least a part of the lighting device that is not covered from one side in the left-right direction by the gear housing and the motor housing.

11. The work machine according to claim 10, wherein the light-emitting part is located outside the motor housing.

12. The lighting device includes a power supply unit that supplies power to the light-emitting unit, a connecting unit that connects the power supply unit and the light-emitting unit, and a holder that holds the light-emitting unit and the connecting unit. The work machine according to claim 10, wherein the holder holds the light-emitting part at a position in front of the spindle.

13. A motor that rotates about an axis in the front-rear direction, A housing comprising a motor housing for housing the motor and a gear housing positioned in front of the motor housing, A spindle supported by the gear housing, extending in the vertical direction, rotating when the driving force of the motor is transmitted to it, and having a disc-shaped tip tool detachably attached to its lower part, A guard member is attached to the gear housing and covers at least a portion of the tip tool, An illumination device having a light-emitting part located above the guard member, which irradiates light toward the lower part of the spindle; Equipped with, The lighting device has a holder for holding the light-emitting part, A work machine in which the rear part of the holder is housed inside the motor housing, and the front part of the holder protrudes forward from the motor housing and is sandwiched between the motor housing and the gear housing.

14. The lighting device comprises a power supply unit that supplies power to the light-emitting unit, a connecting unit that connects the power supply unit and the light-emitting unit, and a holder that holds the light-emitting unit and the connecting unit. The holder holds the light-emitting part at a position in front of the spindle. The holder is arranged to surround the spindle and includes a first holding portion that holds the light-emitting portion and the connecting portion, and a second holding portion that holds the connecting portion. The first retaining portion is positioned radially outward of the spindle relative to the lower end of the gear housing and above the tip tool, The work machine according to claim 10, wherein the light-emitting part overlaps with the gear housing when viewed from above.

15. The lighting device comprises a power supply unit that supplies power to the light-emitting unit, a connecting unit that connects the light-emitting unit and the light-emitting unit, and a holder that holds the light-emitting unit and the connecting unit. The holder holds the light-emitting part at a position in front of the spindle, The holder is arranged to surround the spindle and includes a first holding portion that holds the light-emitting portion and the connecting portion, and a second holding portion that holds the connecting portion. The gear housing is composed of at least two or more segmented members, The work machine according to claim 10, wherein the first holding portion is fixed to the gear housing by a fastener that fixes the divided members together.

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