Work equipment

Abstract

To enhance workability.SOLUTION: In a grinder 10, a housing 20 extended in a longitudinal direction includes: a motor housing 21 that houses a motor 50; and a handle housing 30 configured to be dividable in a lateral direction. The handle housing 30 is arranged behind a motor housing cylindrical portion 22 of the motor housing 21, and the motor housing 21 includes a handle support portion 23 arranged inside the handle housing 30. The handle support portion 23 includes: front fixed support portions 25 and a rear fixed support portion 26 for fastening and fixing the handle housing 30, and the front fixed support portions 25 and the rear fixed support portion 26 are arranged spaced apart in the longitudinal direction. Thereby, the handle support portion 23 functions as a core portion of the hollow handle housing 30 and can fixedly support the handle housing 30.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] In the disk grinder (working machine) described in Patent Document 1 below, the outer contour of the front part of the disk grinder is constituted by a motor housing, and the outer contour of the rear part of the disk grinder is constituted by a handle housing divided into two parts in the left-right direction. The motor housing and the handle housing are connected via a rotation mechanism, and the handle part of the disk grinder is configured to be rotatable at a predetermined angle. Specifically, the rotation mechanism is fixed to the motor housing, and the divided handle housings are fastened to each other and attached to the rotation mechanism.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when the rotation mechanism is omitted in the working machine described in Patent Document 1 above, the housing, which is the outer contour of the working machine, is constituted by assembling the motor housing and the handle housing, which are formed of separate members in the front-rear direction, with each other. That is, by assembling the handle housings divided in the left-right direction with each other, the rear end portion of the motor housing is sandwiched from the outside in the left-right direction by the front end portion of the handle housing. At this time, due to an external force input to the working machine during operation, for example, the housing may be deformed starting from the joint between the handle housing and the motor housing, and it may be difficult to continue the workability. In this case, there is a risk that the workability for the operator may deteriorate.

[0005] The present invention aims to provide a work machine that can improve work efficiency, taking the above facts into consideration. [Means for solving the problem]

[0006] One or more embodiments of the present invention include a motor having a rotation axis with the front-rear direction as the axial direction, a housing extending in the front-rear direction, and an output unit rotationally driven by the motor, The housing comprises a motor housing for housing the motor, and a handle housing that is separate from the motor housing, fixed to the motor housing at the rear of the motor housing, and configured to be separable in the left-right direction. The output unit The fixed tip tool Therefore, the exterior of the housing and in the vicinity of the output section For an object located at The worker grips the handle housing and brings the tip tool into contact with the object. The work machine is capable of performing work, and the rear of the handle housing is provided with a battery mounting section for mounting a battery to supply power to the motor, and the motor housing is provided with a support section having a first support section and a second support section that support the handle housing, the first support section and the second support section are spaced apart in the front-rear direction, and the support section is provided with a holding section for holding electrical components for controlling the motor, and the holding section is positioned between the first support section and the second support section in the front-rear direction.

[0007] One or more embodiments of the present invention are a work machine in which the motor housing comprises a motor housing cylinder portion for housing the motor and a support portion extending rearward from the motor housing cylinder portion, the support portion being located inside the handle housing, and the handle housing being fastened and fixed to the first support portion and the second support portion.

[0008] One or more embodiments of the present invention are work machines in which the handle housing comprises a handle portion and a rear housing portion disposed behind the handle portion, the support portion is disposed inside the handle portion, and a controller for controlling the motor is provided in the rear housing portion and is held in place by the handle housing.

[0009] One or more embodiments of the present invention are: The output unit is a spindle that is rotationally driven by the motor, and the spindle is configured to have a cutting tool attached to it that can be detachably used to process the workpiece. It is a work machine.

[0010] One or more embodiments of the present invention are work machines in which the holding portion is formed in a concave shape that is open to one side in the left-right direction, and the handle housing has a pressing portion formed on both sides in the vertical direction, sandwiched by the tip of the upper wall and the tip of the lower wall of the holding portion.

[0011] One or more embodiments of the present invention are a work machine in which the first support portion is provided in a pair, upper and lower, on the front side of the holding portion, and the second support portion is provided on the rear side of the holding portion.

[0012] One or more embodiments of the present invention are work machines in which the handle housing is provided with a first supported portion supported by the first support portion, a portion of the wiring extending from the motor is routed on one side of the support portion in the left-right direction, and the first support portion is provided with a first guide portion that suppresses interference between the first supported portion and the wiring.

[0013] One or more embodiments of the present invention are work machines in which the handle housing is provided with a second supported portion supported by the second support portion, a portion of the wiring extending from the electrical component is routed on one side of the support portion in the left-right direction, and a second guide portion is formed on the second support portion to suppress interference between the second supported portion and the wiring.

[0014] One or more embodiments of the present invention are work machines in which the second support portion is positioned below the vertical center of the handle portion.

[0015] One or more embodiments of the present invention are work machines in which the motor housing has an engaging portion formed thereon that receives the inner circumferential surface of the front end of the handle portion and is configured to engage with the front end of the handle portion in the front-rear direction.

[0016] One or more embodiments of the present invention are working machines in which the motor housing is composed of an integral, non-separable single member. One or more embodiments of the present invention are work machines in which the electrical component is a switch for turning the motor on and off.

Advantages of the Invention

[0017] According to one or more embodiments of the present invention, workability can be improved.

Brief Description of the Drawings

[0018] [Figure 1] It is a side view seen from the left showing the disc grinder according to this embodiment. [Figure 2] It is a plan view seen from above the disc grinder shown in FIG. 1. [Figure 3] It is a side sectional view seen from the left showing the inside of the disc grinder shown in FIG. 1. [Figure 4] It is a rear view seen from the rear side of the motor housing shown in FIG. 1. [Figure 5] It is a side view seen from the right showing the inside of the handle housing shown in FIG. 1 with the right housing member removed. [Figure 6] It is a perspective view seen from the right obliquely rearward showing the inside of the handle housing shown in FIG. 5. [Figure 7] It is a perspective view seen from the right obliquely downward showing the state in which a spacer is assembled to the gear case shown in FIG. 1. [Figure 8] It is an exploded perspective view of the gear case and the spacer shown in FIG. 7. [Figure 9] It is a perspective view seen from the left obliquely rearward of the spacer shown in FIG. 8. [Figure 10] It is a cross-sectional view (cross-sectional view taken along line 10-10 in FIG. 3) seen from above showing the inside of the gear case shown in FIG. 3. [Figure 11] It is a partially cut-away perspective view showing the fitting state of the fitting convex portion of the spacer shown in FIG. 7 and the relief portion of the gear case. [Figure 12](A) is a rear cross-sectional view showing the rear end of the handle section shown in Figure 5 (cross-sectional view along line 12A-12A in Figure 5), (B) is a rear cross-sectional view showing the middle section of the handle section in the front-rear direction shown in Figure 5 (cross-sectional view along line 12B-12B in Figure 5), and (C) is a rear cross-sectional view showing the front end of the handle section shown in Figure 5 (cross-sectional view along line 12C-12C in Figure 5). [Figure 13] Figure 5 is a magnified view of the operation notification unit, seen from the upper left side. [Figure 14] Figure 13 is an exploded perspective view of the operation notification unit shown. [Figure 15] Figure 5 shows a cross-sectional view (section 13-13 in Figure 5) of the operation notification unit housed in the protruding section, viewed from one side in a perpendicular direction. [Figure 16] Figure 3 is a perspective view from the left rear, showing an example of a spacer and packing land integrated into one unit. [Figure 17] Figure 16 is a cross-sectional view from the left, showing the assembled state of the spacer and packing land to the gear case. [Figure 18] Figure 13 is a side view showing an example of applying the operation notification unit shown in Figure 13 to an impact driver. [Figure 19] Figure 13 is a side view showing an example of applying the operation notification unit shown to a hammer drill. [Modes for carrying out the invention]

[0019] Hereinafter, the disc grinder 10 (hereinafter simply referred to as "Grinder 10") as a work machine according to this embodiment will be described with reference to the drawings. The arrows UP, FR, and LH shown in the drawings as appropriate 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.

[0020] The grinder 10 is configured as a tool for performing grinding and other processes on a workpiece. As shown in Figures 1 to 3, the grinder 10 includes a housing 20, a motor 50 as a drive source, a transmission mechanism 60, and an operation notification unit 80. The following describes each component of the grinder 10.

[0021] (Regarding Housing 20) The housing 20 constitutes the outer casing of the grinder 10, excluding the front end of the grinder 10. The housing 20 is formed as a roughly hollow column extending in the front-rear direction and is open to the front. The housing 20 includes a motor housing 21 which constitutes the front part of the housing 20 and a handle housing 30 which constitutes the rear part of the housing 20.

[0022] (Regarding the motor housing 21) The motor housing 21 is composed of a single, indivisible component. The motor housing 21 includes a motor housing cylinder portion 22 that constitutes the front of the motor housing 21, and a handle support portion 23 that serves as a support portion and constitutes the rear of the motor housing 21.

[0023] The motor housing cylinder 22 is formed in a substantially bottomed cylindrical shape that is open to the front. An enlarged diameter portion 22A is formed at the front end of the motor housing cylinder 22, which protrudes radially outward, and the enlarged diameter portion 22A is formed in a substantially rectangular shape when viewed from the front (see Figure 4). A switch lever 11 (see Figure 1) is provided on the left side of the motor housing cylinder 22. The switch lever 11 is connected to the motor housing cylinder 22 so as to be slidable in the front-rear direction. Specifically, the switch lever 11 is configured to slide between the off position shown in Figure 1 and the on position (not shown), which is reached by sliding it forward from the off position. When the switch lever 11 slides from the off position to the on position, the motor 50, which will be described later, is driven, and the grinder 10 is operated.

[0024] As shown in Figure 3, a motor bearing holder 22B is formed approximately in the center of the rear end of the motor housing cylinder 22, and the motor bearing holder 22B is formed in a substantially bottomed cylindrical shape that is open to the front. As also shown in Figure 4, a receiving portion 22C as an engaging portion is formed at the rear end of the motor housing cylinder 22, radially outward from the motor bearing holder 22B. When viewed from the rear, the receiving portion 22C is formed in a substantially annular shape and is positioned one step inward radially from the outer circumference of the motor housing cylinder 22, protruding to the rear from the outer circumference of the motor housing cylinder 22. An engaging rib 22D is formed at the tip of the receiving portion 22C, and the engaging rib 22D protrudes radially outward from the motor housing cylinder 22 and extends along the circumferential direction of the motor housing cylinder 22.

[0025] Furthermore, the motor bearing holder 22B and the receiving portion 22C are connected by multiple ribs, and multiple holes are formed between the motor bearing holder 22B and the receiving portion 22C. The hole located on the left side of the motor bearing holder 22B is configured as a lever insertion hole 22E, and the hole located on the right side of the motor bearing holder 22B is configured as a wiring insertion hole 22F. In addition, the holes other than the lever insertion hole 22E and the wiring insertion hole 22F are configured as communication holes 22G that connect the handle housing 30 (described later) and the motor housing cylinder 22.

[0026] The handle support portion 23 protrudes rearward from the bottom wall of the motor housing cylinder portion 22 and is configured as a part for fixing and supporting the handle housing 30 to the motor housing 21. The handle support portion 23 will be described later.

[0027] (Regarding the handle housing 30) As shown in Figures 1 to 3, 5, and 6, the handle housing 30 is composed of two housing members 30L and 30R, which are divided in the left-right direction. The handle housing 30 is formed when the housing members 30L and 30R are fastened to each other via a handle support portion 23, which will be described later. The handle housing 30 is composed of a handle portion 31 that constitutes the front part of the handle housing 30 and a rear housing portion 32 that constitutes the rear part of the handle housing 30.

[0028] The handle portion 31 is formed in a substantially cylindrical shape extending in the front-rear direction and is positioned adjacent to the rear side of the motor housing cylinder portion 22. The diameter of the handle portion 31 is set to be smaller than the diameter of the motor housing cylinder portion 22. Specifically, when viewed from the left-right direction, the upper end of the handle portion 31 coincides with the upper end of the motor housing cylinder portion 22 in the vertical direction, and the lower end of the handle portion 31 is offset above the lower end of the motor housing cylinder portion 22. Also, in a plan view, the left and right sides of the handle portion 31 are positioned inward in the left-right direction compared to the left and right sides of the motor housing cylinder portion 22. Furthermore, an inclined portion 20A is formed on the outer circumferential surface of the boundary between the motor housing cylinder portion 22 and the handle portion 31 in the housing 20, and the outer circumferential surfaces of the motor housing cylinder portion 22 and the handle portion 31 are smoothly connected by the inclined portion 20A.

[0029] A stepped portion 31A (see Figure 5) is formed on the inner circumference of the front end of the handle portion 31, extending radially outward. The stepped portion 31A extends along the circumferential direction of the handle portion 31. An engagement groove 31B (see Figure 5) is formed in the stepped portion 31A, opening radially inward from the handle portion 31. The engagement groove 31B extends along the circumferential direction of the motor housing cylinder portion 22. The receiving portion 22C of the motor housing 21 is positioned adjacent to the stepped portion 31A radially inward from the handle portion 31, and the engagement rib 22D of the motor housing 21 is inserted into the engagement groove 31B, so that the motor housing 21 and the handle housing 30 are engaged in the front-rear direction.

[0030] The rear housing portion 32 extends beyond the handle portion 31 in both the vertical and horizontal directions. When viewed from the left and right directions, the rear housing portion 32 is slightly inclined towards the rear as it moves upward (see Figures 1, 3, and 5). In the following description, when viewed from the left and right directions, the direction in which the rear housing portion 32 extends will be referred to as the inclination direction (see arrows S1 and S2 in Figures 1, 3, and 5), and the direction perpendicular to the inclination direction will be referred to as the orthogonal direction (see arrows V1 and V2 in Figures 1, 3, and 5). Also, the side in the direction of arrow S1 in Figures 1, 3, and 5 will be considered one side of the inclination direction, and the side in the direction of arrow V1 in Figures 1, 3, and 5 will be considered one side of the orthogonal direction. Multiple intake holes 32A (see Figure 1) are formed through the left and right side walls of the rear housing portion 32. The intake holes 32A are formed in the shape of elongated holes with the inclination direction as the longitudinal direction. The intake port 32A is covered by a filter 15 provided on the outer circumference of the rear housing portion 32, and the filter 15 is held in a filter holder 16.

[0031] The rear housing portion 32 houses a controller 40 (see Figures 3 and 5) that extends in the vertical direction. The controller 40 consists of a controller board 40A and a board holder 40B that holds the controller board 40A. The board holder 40B is formed in the shape of a box that is open to the front and has a relatively shallow bottom, and is sandwiched from the outside in the left and right directions by housing members 30L and 30R. The controller board 40A is formed in the shape of a substantially rectangular plate with the front-to-back direction as the thickness direction, and is placed inside and held by the board holder 40B. The controller 40 may also be called the main controller.

[0032] At the lower end of the rear housing section 32, in front of the controller 40, a lighting section 41 (see Figures 5 and 6) is provided. The lighting section 41 consists of a lighting substrate 41A and a pair of left and right LEDs 41B. The lighting substrate 41A is formed in a substantially elongated plate shape with the front-to-back direction as the thickness direction and the left-to-right direction as the longitudinal direction, and is held by a substrate holder 41C. The substrate holder 41C is then sandwiched from the left and right outside by housing members 30L and 30R and assembled to the rear housing section 32. The LEDs 41B are mounted on the front of both left and right ends of the lighting substrate 41A and are electrically connected to the controller 40. When an operator presses the panel operation section 84A of the operation notification unit 80 (described later), the LEDs 41B are turned on or off. A lens 33 is provided in front of the LEDs 41B, and the lens 33 is assembled to the rear housing section 32 and constitutes part of the housing 20 (see Figure 1). Then, the light emitted by LED41B passes through lens33 and is projected forward.

[0033] At the rear end of the rear housing portion 32, a battery mounting portion 32B is provided on the rear side of the controller 40 for mounting the battery 42. The battery mounting portion 32B extends along the direction of inclination. The battery mounting portion 32B is formed in a concave shape that is open to one side in the direction of inclination and the other side in the perpendicular direction. A terminal unit 43 (see Figures 3 and 5) is provided in the battery mounting portion 32B, and the terminal unit 43 is assembled to the rear housing portion 32 by being sandwiched from the outside in the left and right directions by housing members 30L and 30R. The terminal unit 43 is electrically connected to the controller 40. The battery 42 is detachably mounted to the battery mounting portion 32B from one side in the direction of inclination, and power from the battery 42 is supplied to the controller 40.

[0034] The upper end of the rear housing portion 32 is configured as a protruding portion 34 for housing the operation notification unit 80, which will be described later. The protruding portion 34 extends outwards in one direction (upwards) from the handle portion 31 and the motor housing 21, and is positioned on one side (upwards) from the controller 40 in the direction of inclination. In other words, the protruding portion 34 protrudes upward from the front of the battery mounting portion 32B and from the rear of the handle portion 31, and when the battery 42 is mounted in the battery mounting portion 32B, the battery 42 protrudes upward from the protruding portion 34.

[0035] As shown in Figures 2 and 5, the outer circumferential surface of the front wall of the overhang 34 is configured as a first surface portion 34A. A first exposed hole 34B is formed through the front wall of the overhang 34, and the first exposed hole 34B is formed in a substantially elongated shape with the left-right direction as its longitudinal direction. The outer circumferential surface of the upper wall of the overhang 34 is configured as a second surface portion 34C. That is, the first surface portion 34A and the second surface portion 34C are arranged adjacent to each other, and the first surface portion 34A and the second surface portion 34C form a corner portion 34E on the overhang 34. In other words, the first surface portion 34A and the second surface portion 34C are wall portions that are adjacent to each other but extend in different directions. In this embodiment, the upper end of the first surface portion 34A is slightly inclined toward the other perpendicular direction as it moves toward one side in the inclination direction. Furthermore, a second exposed hole 34D, which serves as a second opening, is formed through the upper wall of the protruding portion 34, and the second exposed hole 34D is formed in a substantially rectangular shape with the left-right direction as its longitudinal direction.

[0036] A partition wall 34F is formed in the rear housing portion 32 on one side in the inclination direction of the controller 40. The partition wall 34F extends from the lower edge of the second exposed hole 34D to the other side in a perpendicular direction, and the rear end of the partition wall 34F is bent to one side in the inclination direction. The rear end of the partition wall 34F is positioned below and spaced apart from the outer peripheral wall of the protruding portion 34, and a wiring insertion portion 34G is formed between the partition wall 34F and the outer peripheral wall of the protruding portion 34 for routing wiring extending from the circuit board 81 of the operation notification unit 80, which will be described later.

[0037] (Regarding motor 50) As shown in Figure 3, the motor 50 is configured as a brushless motor and is housed in the motor housing cylinder 22 of the motor housing 21. The motor 50 consists of a rotating shaft 51, a rotor 52, and a stator 53.

[0038] The rotating shaft 51 is oriented axially in the front-rear direction. The rear end of the rotating shaft 51 is rotatably supported by a first motor bearing 54 held in the motor bearing holding portion 22B of the motor housing cylinder 22, and the front end portion of the rotating shaft 51 is rotatably supported by a second motor bearing 55 held in the gear case 61, which will be described later. The rotor 52 is positioned radially outside the rotating shaft 51 and is configured to rotate integrally with the rotating shaft 51. The stator 53 is formed in a substantially cylindrical shape with the front-rear direction as its axial direction and is supported by the motor housing cylinder 22 radially outside the rotor 52.

[0039] A fan 56 is integrally rotatable with the front end of the rotating shaft 51, behind the second motor bearing 55. The fan 56 is configured as an axial flow fan. Specifically, the fan 56 is configured to generate an airflow from the rear to the front. This generates an airflow that flows into the handle housing 30 from the intake hole 32A, and this airflow is configured to pass through the lever insertion hole 22E, the wiring insertion hole 22F, and the communication hole 22G of the motor housing 21 and flow forward through the motor housing cylinder 22. As a result, the controller 40 and the motor 50 are cooled by the airflow. The front end of the rotating shaft 51 is located inside the gear case 61, which will be described later, and a pinion gear 57 (broadly understood as a transmission gear) is fixed to the front end of the rotating shaft 51. The gear teeth of the pinion gear 57 are inclined radially inward of the rotating shaft 51 as they move towards the front.

[0040] The motor 50 is electrically connected to the controller 40. Specifically, wiring extending from the motor 50 is routed through a wiring insertion hole 22F in the motor housing 21 and into the handle housing 30, connecting to the controller 40. This configuration allows the controller 40 to drive the motor 50.

[0041] (Regarding the transmission mechanism 60) As shown in Figures 1 to 3, the transmission mechanism 60 is composed of a gear case 61 as a case, a packing land 63 as a bearing holding member, a spindle 66, and a spacer 71 as a cover member.

[0042] (Regarding gear case 61) The gear case 61 constitutes the outer casing of the transmission mechanism 60 and also the outer casing of the front end of the grinder 10. In other words, the gear case 61 is configured as an external component of the grinder 10. The gear case 61 is made of a metal such as aluminum and is cast. As shown in Figure 8, the gear case 61 is formed in a concave shape that opens downwards, and the upper wall of the gear case 61 is inclined upwards toward the rear when viewed from the left and right directions. The rear end of the gear case 61 protrudes above the upper wall of the gear case 61 and is formed in a roughly rectangular cylindrical shape that opens toward the rear. The gear case 61 is fastened and fixed to the motor housing 21 with the enlarged diameter portion 22A of the motor housing 21 abutting against the rear end of the gear case 61 in the front-rear direction. Furthermore, the aforementioned second motor bearing 55 is held by a motor bearing holder 61A formed at the rear end of the gear case 61, and the front end of the motor 50's rotating shaft 51 and the pinion gear 57 are housed inside the gear case 61. In addition, a plurality of exhaust holes 61B are formed through the upper-protruding portion at the rear end of the gear case 61, and the exhaust holes 61B are formed as elongated holes with the left-right direction as the longitudinal direction. The airflow generated by the fan 56 is then exhausted through the exhaust holes 61B.

[0043] On the upper wall of the gear case 61, a spindle bearing holder 61C is formed in front of the rotating shaft 51. The spindle bearing holder 61C is formed in a substantially cylindrical shape with its vertical direction as the axial direction and extends downward from the upper wall of the gear case 61. A first spindle bearing 62, configured as a needle bearing, is held in the spindle bearing holder 61C. On the upper wall of the gear case 61, a material relief portion 61D (see Figures 3, 8, and 11) is formed on the radially outer side (front side) of the spindle bearing holder 61C, opening downward. The material relief portion 61D ensures that the wall thickness of the gear case 61 is substantially uniform. This suppresses the occurrence of surface defects such as sink marks on the outer surface of the gear case 61 during molding. Furthermore, the portion of the gear case 61 between the motor bearing holder 61A and the spindle bearing holder 61C is configured as a gear housing 61E (see Figures 3 and 8) for housing the aforementioned pinion gear 57. A material-reducing portion 61D is also formed in the gear housing 61E, and the material-reducing portion 61D is configured to make the wall thickness of the gear case 61 substantially uniform (see Figures 3 and 8).

[0044] (About Packingland 63) As shown in Figure 3, the packing land 63 is formed in a substantially stepped cylindrical shape with its vertical direction as the axial direction, and is positioned on the lower side of the gear case 61 and fixed to the gear case 61 together with a spacer 71, which will be described later. A second spindle bearing 64 is provided on the radially inner side of the packing land 63, and the second spindle bearing 64 is held in place by being sandwiched vertically between a bearing plate 65 fixed to the packing land 63 and the packing land 63.

[0045] (Regarding spindle 66) The spindle 66 is formed in a substantially cylindrical shape with its vertical direction as the axial direction and is housed within the gear case 61. The upper end of the spindle 66 is rotatably supported by a first spindle bearing 62 of the gear case 61, and the middle portion of the spindle 66 in the vertical direction is rotatably supported by a second spindle bearing 64. A bevel gear 67 is integrally rotatably provided on the upper end portion of the spindle 66, and the bevel gear 67 is positioned between the first spindle bearing 62 and the second spindle bearing 64. More specifically, the bevel gear 67 is housed within the gear case 61 and is positioned below the pinion gear 57 and the material clearance portion 61D of the gear case 61. A gear portion 67A is formed on the upper portion of the outer circumference of the bevel gear 67, and the gear portion 67A meshes with the pinion gear 57. As a result, when the motor 50 is driven, the rotation of the motor 50 is transmitted to the spindle 66, causing the spindle 66 to rotate. The gear portion 67A of the bevel gear 67 and the spindle 66 are coated with grease as a lubricant.

[0046] The lower end (one axial end) of the spindle 66 is configured as a tool mounting portion 66A for attaching the grinding wheel 12 as a cutting tool, and a male screw is formed on the outer circumference of the tool mounting portion 66A. The grinding wheel 12 is formed in a substantially disc shape with the vertical direction as the thickness direction. Specifically, a mounting hole is formed in the center of the grinding wheel 12, and the mounting hole of the grinding wheel 12 is fitted onto the tool mounting portion 66A. A washer 68 is attached to the tool mounting portion 66A on the upper side of the grinding wheel 12, and a nut 69 is screwed onto the tool mounting portion 66A on the lower side of the grinding wheel 12, so that the grinding wheel 12 is sandwiched in the vertical direction by the nut 69 and the washer 68. The washer 68 is located on the lower side of the packing land 63. A wheel guard 70 is detachably fixed to the lower end of the packing land 63, and a part of the grinding wheel 12 is covered by the wheel guard 70.

[0047] (Regarding Spacer 71) As shown in Figures 3 and 7-11, the spacer 71 is positioned inside the gear case 61 and is configured as a member that fills the gap between the inner circumferential surface of the gear case 61 and the bevel gear 67. Specifically, the spacer 71 primarily prevents the space above and radially outward of the bevel gear 67 within the gear case 61 from becoming excessively large, thereby preventing the grease applied to the bevel gear 67 from scattering onto the relief portion 61D of the gear case 61. In other words, the spacer 71 is configured to function as a member that fills the gap between the inner circumferential surface of the gear case 61 and the bevel gear 67, thereby preventing grease from accumulating on the inner circumference of the gear case 61. Furthermore, as described above, the spacer 71 is a member that narrows the space around the bevel gear 67. Therefore, filling the gap between the inner circumferential surface of the gear case 61 and the bevel gear 67 does not mean completely eliminating the gap, but rather reducing its size.

[0048] The spacer 71 is made of a resin material. That is, the spacer 71 is made of a material with a lower specific gravity than the gear case 61. The spacer 71 is formed as a roughly bottomed cylindrical shape that is open to the bottom. More specifically, the spacer 71 is made up of a top wall 71A, a peripheral wall 71B extending downward from the outer circumference of the top wall 71A, and a flange portion 71C as a fastening portion that protrudes radially outward from the lower end of the peripheral wall 71B. The spacer 71 is housed inside the gear case 61, and the flange portion 71C is sandwiched between the lower end surface of the gear case 61 and the upper end surface of the packing land 63, and is fastened to the gear case 61 together with the packing land 63 by fixing screws SC1.

[0049] The peripheral wall 71B is positioned close to the radially outer side of the bevel gear 67. Multiple side holes 71D are formed in the peripheral wall 71B, and a portion of the inner circumference of the gear case 61 is positioned in the side holes 71D, so that the space radially outside the bevel gear 67 is approximately constant in the circumferential direction of the bevel gear 67 (see Figure 10). In other words, the peripheral wall 71B is inserted between the radially outer surface of the bevel gear 67 and the inner circumference of the gear case 61, so that the gap between the bevel gear 67 and the gear case 61 on the radially outer side of the bevel gear 67 is approximately constant (a distance less than or equal to a predetermined distance) in the circumferential direction of the bevel gear 67. The side holes 71D are provided because the distance between the bevel gear 67 and the center of the left wall (or right wall) of the gear case 61 is less than or equal to a predetermined distance, so there is little need to provide a spacer. The side holes 71D allow the spacer 71 to be manufactured lighter and at a lower cost.

[0050] The top wall 71A is positioned close to the upper side of the bevel gear 67 and closes the material clearance portion 61D of the gear case 61 from below (see Figures 3 and 7). In the spacer 71, the radially inner portion of the lower surface of the top wall 71A is offset downward relative to the radially outer portion, corresponding to the shape of the upper surface of the bevel gear 67. The gap between the top wall 71A and the bevel gear 67 is configured to be approximately constant in the radial direction of the bevel gear 67 in the vertical direction.

[0051] Furthermore, a spindle insertion portion 71E for arranging the motor bearing holding portion 61A of the gear case 61 is formed vertically through the approximate center of the top wall 71A. In addition, an arch portion 71F for arranging the rotating shaft 51 and spindle 66 of the motor 50 is formed on the rear side of the spindle insertion portion 71E of the top wall 71A. The arch portion 71F is formed in an inverted U shape that opens downward when viewed from the rear and protrudes upward from the top wall 71A. The arch portion 71F is then housed in the gear housing portion 61E of the gear case 61. The open portion of the arch portion 71F is also formed on the peripheral wall 71B. Furthermore, a fitting projection 71G for fitting is formed on the front part of the top wall 71A, which protrudes upward. The fitting projection 71G is formed in a shape corresponding to the material relief portion 61D of the gear case 61 and is fitted into the material relief portion 61D (see Figure 11).

[0052] (Regarding the handle support section 23) Next, the handle support portion 23 of the motor housing 21 will be described. As shown in Figures 3 to 6 and Figure 12, the handle support portion 23 constitutes the rear part of the motor housing 21, as described above. The handle support portion 23 is positioned within the handle portion 31 of the handle housing 30 and is configured to fix the housing members 30L and 30R of the handle housing 30 and to support the handle portion 31. The handle support portion 23 is formed in a substantially rectangular block shape, with a portion open to the right and extending in the front-rear direction, and protrudes rearward from the motor bearing holding portion 22B of the motor housing cylinder portion 22. The handle support portion 23 is composed of a switch holding portion 24 as a holding portion, a pair of upper and lower first support portions, a front fixed support portion 25, and a rear fixed support portion 26 as a second support portion.

[0053] The switch holding portion 24 constitutes the intermediate portion of the handle support portion 23 in the front-rear direction and is formed in a roughly box shape that opens to the right. Specifically, the switch holding portion 24 has a retaining recess 24A that opens to the right, and the retaining recess 24A is formed in a roughly convex shape that protrudes to the rear when viewed from the right. In addition, the upper surface of the rear end of the switch holding portion 24 is inclined downwards as it is directed towards the rear. A notch 24C for front wiring is formed at the front end of the upper wall 24B of the switch holding portion 24. Furthermore, a notch 24D for rear wiring is formed at the rear end of the upper wall 24B of the switch holding portion 24, and the notch 24D for rear wiring is formed across the rear wall of the switch holding portion 24.

[0054] The retaining recess 24A houses a motor switch 13 as an electrical component, and the switch body 13A of the motor switch 13 is held by the switch retaining portion 24. The motor switch 13 has a plunger 13B that protrudes rearward from the switch body 13A. The motor switch 13 is electrically connected to the controller 40.

[0055] Furthermore, a slide bar 14 (see Figures 12(B) and (C)) extending in the front-rear direction is provided on the left side of the handle support portion 23. The slide bar 14 is inserted through the lever insertion hole 22E of the motor housing 21, and the front end of the slide bar 14 is connected to the aforementioned switch lever 11 so as to be able to move integrally with it. A switch pressing portion 14A (see Figures 5 and 6) bent to the right is formed at the rear end of the slide bar 14. The switch pressing portion 14A is inserted into the lever support hole portion 24E (see Figure 5) formed in the bottom wall of the retaining recess 24A, and is supported by the lever support hole portion 24E so as to be able to slide in the front-rear direction. The switch pressing portion 14A is also positioned adjacent to the rear side of the plunger 13B. When the plunger 13B is pressed forward by the switch pressing portion 14A, the motor switch 13 outputs an ON signal to the controller 40. As a result, the motor 50 is driven by the controller 40.

[0056] As shown in Figures 5, 6, and 12(C), the pair of front fixing support parts 25 constitute the front end of the handle support part 23 and are positioned within the front end of the handle part 31. The pair of front fixing support parts 25 are formed in a substantially cylindrical shape with the left-right direction as the axial direction and are positioned spaced apart in the vertical direction. Specifically, the upper front fixing support part 25 is positioned to protrude slightly above the switch holding part 24. Inside the front fixing support part 25, a fixing wall 25A is provided in the middle part in the left-right direction, and a fixing hole 25B is formed through the fixing wall 25A in the left-right direction.

[0057] Furthermore, the housing member 30L of the handle housing 30, as described above, has a pair of upper and lower front fixing bosses 35 (see Figure 12(C)) formed at a position corresponding to the front fixing support portion 25. The front fixing bosses 35 are formed in a substantially cylindrical shape with the left-right direction as the axial direction and extend to the right from the housing member 30L. The front fixing bosses 35 are inserted into the front fixing support portion 25 from the left side and are positioned adjacent to the left side of the fixing wall 25A. In addition, the housing member 30R has a pair of upper and lower front fixing bosses 36 (see Figure 12(C)) formed as first supported portions at a position corresponding to the front fixing support portion 25. The front fixing bosses 36 are formed in a substantially stepped cylindrical shape and extend to the left from the housing member 30R. More specifically, the front fixed boss 36 is composed of a roughly bottomed cylindrical front counterbore portion 36A that opens to the right, and a cylindrical boss body portion 36B that extends to the left from the bottom of the front counterbore portion 36A. The boss body portion 36B is inserted into the front fixing support portion 25 from the right and is positioned adjacent to the right side of the fixing wall 25A. The fixing screw SC2 is inserted into the boss body portion 36B and the fixing hole 25B of the fixing wall 25A from the right and screwed into the inner circumferential surface of the front fixed boss 35. As a result, the housing members 30L and 30R are fastened and fixed to the front fixing support portion 25 by the fixing screw SC2, and the handle housing 30 is fixed to the motor housing 21.

[0058] A connecting wall 27 is provided between a pair of front fixed support sections 25 in the handle support section 23 of the motor housing 21. The connecting wall 27 extends vertically with the left-right direction being the plate thickness direction, and connects the axial intermediate sections of the front fixed support sections 25. The rear parts of the front fixed support sections 25 and the connecting wall 27 are connected to the front wall of the switch holding section 24, and the front parts of the front fixed support sections 25 and the connecting wall 27 are connected to the bottom wall of the motor bearing holding section 22B.

[0059] Furthermore, a front wiring guide portion 28, which serves as a first guide portion, is formed at the lower end of the right end surface of the upper front fixing support portion 25. The front wiring guide portion 28 is formed in a plate shape with the vertical direction being the thickness direction, protruding to the right from the front fixing support portion 25 and positioned below the front counterbore portion 36A of the housing member 30R (see Figure 12(C)). The wiring inserted through the wiring insertion hole 22F is routed below the front wiring guide portion 28 and bent upward by the rear end of the front wiring guide portion 28 (see arrow B in Figure 5). The wiring bent upward passes through the front wiring notch 24C and is positioned above the upper wall 24B of the switch holding portion 24, and is configured to extend towards the controller 40 (see arrow B in Figure 5).

[0060] As shown in Figures 5, 6, and 12(A), the rear fixing support portion 26 constitutes the rear end of the handle support portion 23 and is positioned at the rear end of the handle portion 31. That is, the handle support portion 23 is positioned over the entire front-to-rear length of the handle portion 31. Similar to the front fixing support portion 25, the rear fixing support portion 26 is formed in a substantially cylindrical shape with the left-to-right direction as its axial direction and is connected to the lower end of the rear end of the switch holding portion 24. That is, the rear fixing support portion 26 constitutes a part of the rear wall of the switch holding portion 24 and is positioned below the rear wiring notch 24D. Furthermore, the rear fixing support portion 26 is positioned offset below the vertical center of the handle support portion 23. Specifically, the rear fixing support portion 26 is positioned below the vertical centerline CL of the handle portion 31. Inside the rear fixing support portion 26, a fixing wall 26A is provided in the middle section in the left-to-right direction, and a fixing hole 26B is formed through the fixing wall 26A in the left-to-right direction.

[0061] Furthermore, the housing member 30L of the handle housing 30, as described above, has a rear fixing boss 37 (see Figure 12(A)) formed at a position corresponding to the rear fixing support portion 26. The rear fixing boss 37 is formed in a substantially cylindrical shape with the left-right direction as its axial direction and extends to the right from the housing member 30L. The rear fixing boss 37 is inserted into the rear fixing support portion 26 from the left side and is positioned adjacent to the left side of the fixing wall 26A. In addition, the housing member 30R has a rear fixing boss 38 (see Figure 12(A)) formed as a second supported portion at a position corresponding to the rear fixing support portion 26. The rear fixing boss 38 is formed in a substantially stepped cylindrical shape and extends to the left from the housing member 30R. Specifically, the rear fixing boss 38 is composed of a substantially bottomed cylindrical rear counterbore portion 38A that opens to the right, and a cylindrical boss body portion 38B that extends to the left from the bottom of the rear counterbore portion 38A. The boss body 38B is inserted into the rear fixing support portion 26 from the right side and positioned adjacent to the right side of the fixing wall 26A. The fixing screw SC3 is then inserted into the boss body 38B and the fixing hole 26B of the fixing wall 26A from the right side and screwed into the inner circumferential surface of the rear fixed boss 37. As a result, the housing members 30L and 30R are fastened and fixed to the rear fixing support portion 26 by the fixing screw SC3, and the handle housing 30 is fixed to the motor housing 21.

[0062] Furthermore, a rear wiring guide portion 29, which serves as a second guide portion, is formed at the front end of the right end surface of the rear fixing support portion 26. The rear wiring guide portion 29 is formed in a columnar shape that extends in the left-right direction, protruding to the right from the rear fixing support portion 26, and is positioned adjacent to the lower side of the rear wiring notch 24D. The rear wiring guide portion 29 is also positioned in front of the rear counterbore portion 38A of the housing member 30R. The wiring extending from the right side of the motor switch 13 to the rear is routed through the rear wiring notch 24D (see arrow C in Figure 5), and the rear wiring guide portion 29 is configured to suppress interference between the wiring and the rear counterbore portion 38A.

[0063] Furthermore, as shown in Figure 12(B), the housing member 30R has a pair of front and rear retaining portions 39 (only one retaining portion 39 is shown in Figure 12(B)). The retaining portions 39 are formed in a rib shape with the front-to-back direction being the thickness direction, and are formed in a substantially U-shape that opens to the left when viewed from the front-to-back direction, protruding to the left from the inner circumferential surface of the housing member 30R. The retaining portions 39 are positioned between the tip of the upper wall 24B and the tip of the lower wall 24F of the switch holding portion 24, and are positioned adjacent to the right side of the motor switch 13. A minute gap is formed in the vertical direction between the retaining portions 39 and the switch holding portion 24.

[0064] (Regarding the operation notification unit 80) As shown in Figures 5, 6, and 13-15, the operation notification unit 80 is housed in the protruding portion 34 of the handle housing 30. That is, the operation notification unit 80 is positioned above the controller 40, and the operation notification unit 80 and the controller 40 are aligned vertically. The operation notification unit 80 consists of a circuit board 81, a notification panel 82 as a notification section or panel section, and a speed setting section 87. The circuit board 81 is positioned with its inclination direction as the thickness direction, the notification panel 82 is positioned on one side (upper side) of the circuit board 81 in the thickness direction, and the speed setting section 87 is positioned on the other side (lower side) of the circuit board 81 in the thickness direction, with the notification panel 82 and speed setting section 87 assembled so as to sandwich the circuit board 81 from both sides in the thickness direction. The operation notification unit 80 corresponds to the control unit in the present invention. The operation notification unit 80 may also be called a sub-controller.

[0065] (Regarding the notification panel section 82) The notification panel section 82 comprises a panel base 83, a panel sheet 84, and a tactile switch 85 and an LED 86 as first electrical components. The tactile switch 85 is mounted on the left end of the upper surface (one side) of the circuit board 81, and the LED 86 is mounted on the right end of the upper surface of the circuit board 81. The tactile switch 85 and LED 86 are electrically connected to the controller 40 via the circuit board 81. Specifically, wiring extending from the circuit board 81 passes through the wiring insertion section 34G of the rear housing section 32, is routed to the lower side of the partition wall 34F, and is connected to the controller 40 (see arrow D in Figure 5). The tactile switch 85 is configured as a switch to turn the LED 41B in the lighting section 41 on or off. That is, the tactile switch 85 is configured to change the state of the grinder 10. The LED 86 is configured as a light source to notify the state of the grinder 10. For example, when the grinder 10 is in an abnormal state, such as when the motor 50 is overloaded, the LED 86 flashes, and the transparent portion 84B of the panel sheet 84, described later, notifies the user of the abnormal state of the grinder 10. In other words, the LED 86 is configured to notify the user of the status of the grinder 10. Accordingly, the notification panel 82 is configured to notify or change the status of the grinder 10 (working machine).

[0066] The panel base 83 is made of resin. The panel base 83 is formed in the shape of a relatively shallow box that is open to the other side in the direction of inclination, and is formed in the shape of a substantially rectangular shape with the left-right direction as the longitudinal direction when viewed from the direction of inclination. Stepped portions 83A are formed at the corners on both sides of the panel base 83 in the orthogonal direction, and the width dimension (orthogonal dimension) of the part of the panel base 83 on one side in the direction of inclination is set to be smaller than the width dimension of the part of the panel base 83 on the other side in the direction of inclination. With the part of the panel base 83 on one side in the direction of inclination positioned in the second exposed hole 34D of the handle housing 30, the panel base 83 is attached to the handle housing 30 by being sandwiched from both sides in the left-right direction by the housing members 30L and 30R. Mounting pieces 83B are formed on both the left and right sides of the panel base 83, and the mounting pieces 83B are formed in the shape of a substantially rectangular plate with the inclination direction as the plate thickness direction, and protrude outward from the panel base 83 in the left-right direction. The mounting piece 83B engages with the handle housing 30 in both the inclined and perpendicular directions, thereby restricting the relative movement of the operation notification unit 80 with respect to the handle housing 30.

[0067] Fixed bosses 83C (see Figure 14) are formed on the top wall of the panel base 83 at both the left and right ends. The fixed bosses 83C are formed in a substantially cylindrical shape with the inclination direction as the axial direction, and protrude from the top wall to the other side in the inclination direction. A circuit board 81 is housed in the opening of the panel base 83, and the circuit board 81 is positioned adjacent to the fixed bosses 83C on the other side in the inclination direction. A switch hole 83D is formed through the top wall of the panel base 83 at a position corresponding to the tactile switch 85, and the switch portion of the tactile switch 85 is positioned within the switch hole 83D. In addition, an illumination hole 83E is formed through the top wall of the panel base 83 at a position corresponding to the LED 86. This configuration allows light emitted by the LED 86 to pass through the illumination hole 83E and illuminate one side in the inclination direction.

[0068] The panel sheet 84 is formed as a relatively thin sheet with the inclination direction being the thickness direction. The panel sheet 84 is attached to the upper surface of the panel base 83 so as to cover almost the entire upper surface of the panel base 83. As a result, the panel sheet 84 is exposed through the second exposure hole 34D in an operable and visible manner, and the exposed upper surface of the panel sheet 84 is configured as a display surface. A panel operation section 84A is formed on the panel sheet 84 in a part corresponding to the switch hole 83D of the panel base 83. The panel operation section 84A is formed in a roughly rectangular shape when viewed from the inclination direction and is slightly raised on one side in the inclination direction relative to the panel sheet 84. As a result, when an operator presses the panel operation section 84A, the tactile switch 85 is pressed, and the LED 41B of the lighting section 41 turns on or off. In addition, a transparent section 84B, which serves as a display section, is formed on the panel sheet 84 at a position corresponding to the switch hole 83D of the panel base 83. In the panel sheet 84, the portion excluding the transparent portion 84B is made opaque, while the transparent portion 84B is made transparent. As a result, the light emitted by the LED 86 passes through the transparent portion 84B, and the LED 86 notifies of any abnormal condition of the grinder 10.

[0069] (Regarding the speed setting unit 87) The speed setting unit 87 is configured as a mechanism for setting the target rotational speed of the motor 50. The speed setting unit 87 includes a rotary cover 88 (which is broadly understood as a cover), a rotary potentiometer 89 as a second electrical component provided on the other side of the circuit board 81, and an operating dial 90.

[0070] The rotary cover 88 is formed in the shape of a rectangular plate with the inclination direction being the thickness direction, and is positioned adjacent to the other side of the circuit board 81 in the inclination direction, closing the opening of the panel base 83. The rotary cover 88 is fastened and fixed to the panel base 83 together with the circuit board 81 by fixing screws SC4 that are screwed into fixing bosses 83C of the panel base 83. A cover cylinder portion 88A is formed in the left-right center of the rotary cover 88, and the cover cylinder portion 88A is formed in a substantially cylindrical shape with the inclination direction being the axial direction, and extends from the cover cylinder portion 88A to the other side in the inclination direction. A stopper portion 88B (see Figure 15) is formed at the left end of the outer circumference of the cover cylinder portion 88A, and the stopper portion 88B is formed in the shape of a rib that extends in the vertical direction.

[0071] The rotary potentiometer 89 (see Figure 15) is mounted on the other side (the other side in the inclined direction) of the circuit board 81 and is positioned radially inward of the cover cylinder portion 88A of the rotary cover 88. The rotary potentiometer 89 is configured as a rotary variable resistor and is electrically connected to the controller 40 via the circuit board 81. The rotary potentiometer 89 is also connected to the operation dial 90, which will be described later, and outputs an output signal to the controller 40 according to the rotation position of the operation dial 90, and the controller 40 sets the rotation speed of the rotation shaft 51 of the motor 50.

[0072] The operating dial 90 is formed as a roughly bottomed cylindrical shape with a relatively shallow bottom, open to one side in the direction of inclination. The central part of the bottom wall of the operating dial 90 is formed as a roughly bottomed cylindrical shape, open to the other side in the direction of inclination, and protrudes from the bottom wall of the operating dial 90 to one side in the direction of inclination. A dial connecting shaft 90A is formed in the central part of the bottom wall of the operating dial 90, and the dial connecting shaft 90A protrudes from the operating dial 90 to one side in the direction of inclination. The tip of the dial connecting shaft 90A is fitted into the center of the rotary volume 89, and the operating dial 90 is configured to be rotatable around the dial connecting shaft 90A. In addition, a part of the outer circumference of the operating dial 90 is positioned in the first exposed hole 34B of the handle housing 30 and protrudes forward (to one side in the orthogonal direction) in an operable manner. As a result, the rotation position of the rotary volume 89 is changed when the operating dial 90 is rotated. A restricting portion 90B is formed on the outer circumference of the bottom wall of the operating dial 90. The restricting portion 90B extends along the circumferential direction of the operating dial 90 and is configured to contact the stopper portion 88B of the rotary cover 88. As a result, when the restricting portion 90B contacts the stopper portion 88B, the rotation range of the operating dial 90 is set to within one rotation.

[0073] (Effects and Benefits) Next, the operation and effects of the grinder 10 of this embodiment will be described.

[0074] When processing with the grinder 10 configured as described above, the operator grips the handle portion 31 of the housing 20 and operates the operation dial 90 of the operation notification unit 80 to set the rotation speed of the motor 50. Then, by sliding the switch lever 11 from the off position to the on position, the motor switch 13 is turned on by the switch pressing portion 14A of the slide bar 14, and an on signal is output from the motor switch 13 to the controller 40. As a result, the motor 50 is driven and the spindle 66 and grinding wheel 12 rotate. Thus, the grinder 10 can perform grinding and other processing on the workpiece. In addition, by pressing the panel operation portion 84A of the notification panel portion 82 by the operator, the LED 41B of the illumination portion 41 lights up, and the light emitted by the LED 41B is projected forward. This illuminates the area around the grinding wheel 12.

[0075] Furthermore, in the transmission mechanism 60 of the grinder 10, the gear case 61 that constitutes the outer casing of the transmission mechanism 60 is formed in a concave shape that opens downwards. The spindle 66 and the bevel gear 67 are housed inside the gear case 61, and the bevel gear 67 meshes with the pinion gear 57 provided on the rotating shaft 51 of the motor 50. As a result, if the grease applied to the gear portion 67A of the bevel gear 67 is scattered to the inner circumference of the gear case 61, such as the material relief portion 61D, and accumulates in that inner circumference, the bevel gear 67 may run out of grease, potentially reducing the wear resistance of the pinion gear 57 and the bevel gear 67.

[0076] (Regarding the effects of spacer 71) Here, a spacer 71 is housed in the gear case 61, and the spacer 71 is positioned between the transmission members housed in the gear case 61, namely the gears (pinion gear 57, bevel gear 67), and the gear case 61. In other words, the spacer 71 reduces the gap between the pinion gear 57 and bevel gear 67 and the inner circumference of the gear case 61. Specifically, the gear portion 67A of the bevel gear 67 is formed on the upper outer circumference of the bevel gear 67, and the spacer 71 narrows the gap between the bevel gear 67 and the gear case 61 on the upper side and radially outward side of the bevel gear 67. In addition, the gap between the upper part of the pinion gear 57 and the upper inner circumference of the gear case 61 is narrowed. That is, the spacer 71 is positioned on the upper side and radially outward side of the bevel gear 67, and close to the upper side of the pinion gear 57. Therefore, the spacer 71 prevents grease from scattering onto the inner circumference of the gear case 61, such as the material relief portion 61D, and prevents grease buildup in the inner circumference of the material relief portion 61D. In addition, although grease scattered from the bevel gear 67 adheres to the spacer 71, because the spacer 71 is positioned close to the bevel gear 67, the grease attached to the spacer 71 is circulated back to the bevel gear 67. This prevents grease depletion in the bevel gear 67. As a result, the wear resistance of the pinion gear 57 and the bevel gear 67 can be improved. Therefore, the reliability of the grinder 10 can be improved.

[0077] Furthermore, the gear case 61 constitutes an external component of the grinder 10. This makes it possible to improve the wear resistance and durability of the pinion gear 57 and bevel gear 67 while suppressing cosmetic defects of the grinder 10. That is, for example, by omitting the material relief portion 61D in the gear case 61 and forming a shape corresponding to the spacer 71 in advance in the gear case 61, the gap between the inner circumference of the gear case 61 and the bevel gear 67 can be narrowed. In this case, a portion of the gear case 61 becomes thicker, resulting in uneven wall thickness in the gear case 61. Therefore, there is a risk of cosmetic defects such as sink marks occurring during the casting of the gear case 61. In contrast, in this embodiment, the spacer 71 narrows the gap between the inner circumference of the gear case 61 and the bevel gear 67. In other words, the spacer 71 fills the space between the gear case 61 and the bevel gear 67. Therefore, a material relief portion 61D can be formed in the gear case 61 to make the thickness of the gear case 61 uniform. Thus, the wear resistance of the pinion gear 57 and bevel gear 67 can be improved while suppressing cosmetic defects of the grinder 10. In addition, by providing the material relief portion 61D, the weight of the gear case 61 can be reduced, and consequently the weight of the grinder 10 can be reduced. Furthermore, the spacer 71 has a portion that is thicker in the radial or axial direction (thick portion) and a portion that is thinner (thin portion). The thick portion is located in the part where the distance (spacing) between the inner surface of the gear case 61 and the bevel gear 67 is greater than a predetermined value, and the thin portion is located in the part where the distance (spacing) is less than a predetermined value. In other words, the spacer 71 suitably fills the space between the inner surface of the gear case 61 and the outer surface of the spacer 71. This prevents grease from entering between the spacer 71 and the inner surface of the gear case 61. Furthermore, the spacer 71 does not necessarily need to have a thick portion and a thin portion; it may be constructed as a member with a uniform thickness.

[0078] Furthermore, the gear case 61 is made of metal, and the spacer 71 is made of resin. In other words, the spacer 71 is made of a material with a lower specific gravity than the gear case 61. Therefore, even with the addition of the spacer 71 to the gear case 61, it is possible to improve the wear resistance of the pinion gear 57 and the bevel gear 67 while suppressing an increase in the weight of the grinder 10.

[0079] Furthermore, the top wall 71A of the gear case 61 is provided with a fitting projection 71G that protrudes upward, and the fitting projection 71G is fitted into the material relief portion 61D of the gear case 61. Therefore, when assembling the spacer 71 to the gear case 61, the position of the spacer 71 can be determined by the material relief portion 61D and the fitting projection 71G of the gear case 61. Thus, by utilizing the material relief portion 61D, the ease of assembling the spacer 71 to the gear case 61 can be improved.

[0080] Furthermore, the flange portion 71C of the spacer 71 is sandwiched vertically between the gear case 61 and the packing land 63, thereby fixing it to the gear case 61. In other words, the spacer 71 is fastened together with the packing land 63 to the gear case 61. Therefore, the packing land 63, which holds the second spindle bearing 64, can be used to fix the spacer 71 to the gear case 61.

[0081] (Regarding variations of spacer 71) Next, a modified example of the spacer 71 will be described using Figures 16 and 17. In the modified example of the spacer 71, the spacer 71 is molded integrally with the packing land 63, and the spacer 71 and the packing land 63 are configured as a single, indivisible component.

[0082] In a modified version of the spacer 71, both the spacer 71 and the packing land 63 are made of resin. In this modified version of the spacer 71, the portion of the spacer 71 corresponding to the peripheral wall 71B and the flange portion 71C is integrally formed with the packing land 63. That is, in this modified version of the spacer 71, the portion corresponding to the top wall 71A of the spacer 71 is omitted. Therefore, in the example where the spacer 71 and the packing land 63 are integrated, the spacer 71 is primarily used to fill the gap between the bevel gear 67 and the gear case 61 on the radially outer side of the bevel gear 67. Furthermore, the packing land 63 has a raised portion 63A formed on the radially outer side of the peripheral wall 71B, which is raised above the flange portion 71C. Multiple holes 63B that open upward are formed in the raised portion 63A, and the holes 63B are arranged in a line along the circumferential direction of the packing land 63.

[0083] Furthermore, in the modified spacer 71, the radially outer gap of the bevel gear 67 is filled by the spacer 71, so that grease scattered radially outward from the bevel gear 67 adheres to the spacer 71 and the inner circumference of the gear case 61, and the grease adhering to the spacer 71 and the gear case 61 is circulated so that it returns to the bevel gear 67. Therefore, as in this embodiment, the occurrence of grease depletion in the bevel gear 67 can be suppressed. As a result, the wear resistance of the pinion gear 57 and the bevel gear 67 can be improved. Consequently, the reliability of the grinder 10 can be improved.

[0084] In the modified version of the spacer 71, multiple holes 63B are formed in the raised portion 63A of the packing land. The holes 63B are located below the gear portion 67A of the bevel gear 67 and radially inward of the outer circumference of the bevel gear 67. Therefore, there is a low possibility that grease scattered from the rotating bevel gear 67 will move towards the holes 63B, and the risk of grease accumulating in the holes 63B is low.

[0085] Furthermore, in this embodiment, a fitting projection 71G is formed on the top wall 71A of the spacer 71, but the fitting projection 71G may be omitted in the spacer 71.

[0086] (Regarding the effects of the handle support section 23) Furthermore, in the grinder 10, the housing 20 extending in the front-rear direction includes a motor housing 21 that houses the motor 50 and a handle housing 30 that is configured to be separable in the left-right direction. The handle housing 30 is positioned behind the motor housing cylindrical portion 22 of the motor housing 21 and is fixed to the motor housing 21. Specifically, the motor housing 21 has a handle support portion 23 located inside the handle housing 30, and the handle support portion 23 includes a front fixing support portion 25 and a rear fixing support portion 26 that fasten and fix the handle housing 30. The front fixing support portion 25 and the rear fixing support portion 26 are positioned spaced apart in the front-rear direction. As a result, the handle support portion 23 functions as the core of the hollow handle housing 30 and can fix and support the handle housing 30 in the longitudinal direction of the handle housing 30. Therefore, the bending rigidity of the entire housing 20 can be increased. As a result, when the grinder 10 is used for machining, for example, by pressing the grinding wheel 12 against the workpiece, an upward reaction force is applied to the front end of the housing 20, but this reaction force can be received by the front fixed support portion 25 and the rear fixed support portion 26, which are spaced apart from each other. This prevents local deformation of the housing 20 at the connection portion (joint) between the front end of the handle housing 30 and the rear end of the motor housing cylinder portion 22. In this way, the rigidity of the housing 20 can be ensured and the workability of the grinder 10 can be improved.

[0087] Furthermore, the handle support portion 23 is located within the handle portion 31 of the handle housing 30. Specifically, the front fixed support portion 25 is located within the front end of the handle portion 31, and the rear fixed support portion 26 is located within the rear end of the handle portion 31, so that the handle support portion 23 extends along the entire longitudinal direction of the handle portion 31. The controller 40 is provided in the rear housing portion 32 of the handle housing 30 and is held in place from both the left and right sides by housing members 30L and 30R. As a result, the handle support portion 23 supports the handle portion 31, which is gripped by the operator, along its entire longitudinal direction, while the controller 40 can be housed within the handle housing 30 at the rear of the handle portion 31. This allows the handle support portion 23 to be located within the handle housing 30 without affecting the storage capacity of the controller 40 within the handle housing 30.

[0088] Furthermore, the handle support portion 23 has a switch holding portion 24 for holding the motor switch 13, and the switch holding portion 24 is positioned between the front fixed support portion 25 and the rear fixed support portion 26. This allows the motor switch 13 to be held using the handle support portion 23. In addition, since the front fixed support portion 25, the switch holding portion 24 (motor switch 13), and the rear fixed support portion 26 are arranged in line in the extending direction (front-to-back direction) of the handle portion 31, the rigidity of the handle portion 31 can be increased while suppressing an increase in the vertical and horizontal dimensions of the handle portion 31.

[0089] Furthermore, the switch holding portion 24 is formed in a concave shape that opens to the right, and a retaining portion 39 is formed in the housing member 30R, which is inserted between the upper wall 24B and the lower wall 24F of the switch holding portion 24. As a result, the housing member 30R functions as a cover that closes the opening of the switch holding portion 24. Therefore, for example, when a torsional force with the front-rear direction as the axial direction acts on the housing 20 and the handle housing 30 is displaced, the retaining portion 39 comes into contact with the switch holding portion 24, suppressing deformation of the handle housing 30. This further improves the support performance of the handle support portion 23 on the handle housing 30. In addition, the retaining portion 39 is positioned adjacent to the right side of the motor switch 13. As a result, the holding state of the switch holding portion 24 on the motor switch 13 can be maintained well.

[0090] Furthermore, in the handle support section 23, a pair of upper and lower front fixing support sections 25 are provided on the front side of the switch holding section 24. This allows the joint between the motor housing cylinder section 22 and the handle housing 30, which has low bending rigidity in the housing 20, to be fixed by the pair of upper and lower front fixing support sections 25, thereby increasing the rigidity of the joint. In addition, one rear fixing support section 26 is provided on the rear side of the switch holding section 24. Therefore, for example, wiring extending from the motor 50 to the rear and wiring extending from the motor switch 13 to the rear can be routed above the rear fixing support section 26 and guided to the controller 40. In particular, the rear fixing support section 26 is positioned below the vertical center line CL of the handle section 31. Therefore, for example, space for routing the above wiring can be effectively secured.

[0091] Furthermore, a front wiring guide portion 28 is formed on the upper front fixing support portion 25 of the handle support portion 23, and the wiring extending from the motor 50 is guided upward by the front wiring guide portion 28 and routed on the upper side of the upper wall 24B of the switch holding portion 24. This allows the wiring extending from the motor 50 to be routed to avoid the motor switch 13 and guided to the controller 40 side. In addition, the wiring extending from the motor 50 is positioned below the front wiring guide portion 28, and the upper front fixing boss 36 of the housing member 30R is positioned above the front wiring guide portion 28. Therefore, when inserting the front fixing boss 36 of the housing member 30R into the front fixing support portion 25, interference between the front fixing boss 36 and the wiring can be suppressed. Thus, the workability when assembling the housing member 30R to the handle support portion 23 can be improved.

[0092] Furthermore, a rear wiring guide portion 29 is formed at the front end of the rear fixing support portion 26, and the wiring extending from the motor switch 13 is routed above the rear wiring guide portion 29. This prevents the rear fixing boss 38 of the housing member 30R from interfering with the wiring when it is inserted into the rear fixing support portion 26. Therefore, the workability when assembling the housing member 30R to the handle support portion 23 can be improved.

[0093] Furthermore, a receiving portion 22C extending in the circumferential direction is formed at the rear end of the motor housing cylinder portion 22, and the receiving portion 22C receives the stepped portion 31A of the handle portion 31 from the radially inward direction. This effectively increases the rigidity of the joint between the motor housing 21 and the handle housing 30. In addition, the engaging rib 22D of the receiving portion 22C is inserted into the engaging groove 31B of the handle housing 30, so that the motor housing 21 and the handle housing 30 are engaged in the front-rear direction. This allows for good maintenance of the fixed state between the motor housing 21 and the handle housing 30.

[0094] Furthermore, the motor housing 21 is constructed from a single, indivisible component. This allows the motor 50 to be held accurately by the motor housing cylinder 22, while also reducing the size of the motor housing 21. In other words, if the motor housing 21 were configured to be separable in the left-right direction, misalignment of the separated housing components could worsen the holding accuracy of the motor housing 21 to the motor 50. Also, if the motor housing 21 were configured to be separable in the left-right direction, bosses or the like would be required to fix the separated housing components together, potentially increasing the size of the motor housing 21. In contrast, by constructing the motor housing 21 from a single, indivisible component, the aforementioned misalignment of the separated housing components does not occur, and bosses to fix the housing components together are not required. This allows the motor 50 to be held accurately by the motor housing 21, while also reducing the size of the motor housing 21.

[0095] (Regarding the effects of the operation notification unit 80) Furthermore, the grinder 10 has an operation notification unit 80, which integrates a notification panel 82 that notifies the status of the grinder 10 and a speed setting unit 87 that can set the target rotational speed of the motor 50. Therefore, compared to a configuration in which the notification panel 82 and the speed setting unit 87 are separate units and these separate units are installed on the grinder 10, the notification panel 82 and the speed setting unit 87 can be consolidated, and the number of work steps can be reduced. Thus, the grinder 10 can be made smaller while improving ease of assembly.

[0096] More specifically, if the notification panel 82 and the speed setting unit 87 are separate units, a circuit board corresponding to each unit is required. In contrast, in the grinder 10 of this embodiment, the circuit board 81 of the operation notification unit 80 is configured as a common circuit board for the notification panel 82 and the speed setting unit 87. Therefore, compared to the case where the notification panel 82 and the speed setting unit 87 are separate units, it is possible to reduce the number of parts. Moreover, the notification panel 82 is located on one side of the circuit board 81 in the thickness direction, and the tactile switch 85 and LED 86 of the notification panel 82 are mounted on the upper surface (one side) of the circuit board 81. Furthermore, the speed setting unit 87 is located on the other side of the circuit board 81 in the thickness direction, and the rotary volume 89 of the speed setting unit 87 is mounted on the lower surface (other side) of the circuit board 81. This allows the electrical components of the notification panel 82 and speed setting unit 87 to be mounted on the circuit board 81 while utilizing both sides of the circuit board 81 in the thickness direction, and the notification panel 82 and speed setting unit 87 to be arranged on both sides of the circuit board 81 in the thickness direction. Therefore, an efficient arrangement structure can be realized in the operation notification unit 80. The notification panel 82 is configured to have both a function to notify the status of the grinder 10 and a function to change the status of the grinder 10, but it may have only one of these functions. In addition to visual notification by the LED 86, the means of notifying the status may also be sound such as a buzzer or vibration notification using an actuator that emits vibration. Furthermore, as a function to change the status, the panel operation unit 84A may be configured as a standby switch that releases the state in which the motor 50 is prohibited when operated, or as a forward / reverse switch that switches the forward rotation and reverse rotation of the motor 50 when it is running. In other words, the status notification function and status change function in the present invention can be changed to various things.

[0097] Furthermore, in the operation notification unit 80, the panel sheet 84 exposed to the outside of the housing 20 is arranged parallel to the circuit board 81, and the rotation axis of the operation dial 90 exposed to the outside of the housing 20 extends along the thickness direction of the circuit board 81. Therefore, the circuit board 81, the panel sheet 84, and the operation dial 90 can be arranged in parallel. Thus, the operation notification unit 80 can be miniaturized in the thickness direction of the circuit board 81.

[0098] Furthermore, in the handle housing 30, the handle portion 31 extends in the front-to-back direction (first direction) in front of the protruding portion 34, and the operating dial 90 is exposed from the protruding portion 34 to the front side (the handle portion 31 side, one side in the first direction) so that it can be operated. Therefore, when rotating the operating dial 90, the hand gripping the handle portion 31 can easily access the operating dial 90. Thus, convenience for the operator can be improved.

[0099] Furthermore, in the handle housing 30, the operation notification unit 80 is housed in an overhang 34 that extends upward (to one side in the second direction) relative to the handle portion 31, and the controller 40 is positioned below the operation notification unit 80 (to the other side in the second direction). As a result, the operation notification unit 80 and the controller 40 can be arranged vertically and compactly within the handle housing 30 at the rear of the handle portion 31. This makes it possible to miniaturize the grinder 10 in the front-to-back direction compared to, for example, a configuration in which the operation notification unit 80 is positioned between the handle portion 31 and the controller 40.

[0100] Furthermore, a first exposure hole 34B is formed through the first surface 34A (front) of the protruding portion 34 of the handle housing 30, and a part of the operation dial 90 is exposed and operable through the first exposure hole 34B. Also, a second exposure hole 34D is formed through the second surface 34C (top) of the protruding portion 34, and the panel sheet 84 of the notification panel portion 82 is exposed and visible through the second exposure hole 34D. This allows for efficient use of the internal space of the housing and makes the housing (handle housing 30) smaller. In other words, in the case of work machines, corners (corners 34E in this embodiment) inevitably occur due to the structure. In particular, when a battery can be attached, the area where the battery is attached will protrude to match the size of the battery, and corners are likely to occur. For example, when a corner with a front and top surface (as in this embodiment) occurs, conventionally, control members such as a control panel or speed adjustment dial were placed in the corner, and a part of them was exposed, for example, from the front. However, in conventional designs, the internal space of the corner is occupied by the control member, making it impossible to place other control members in the corner and expose them from above. However, according to this embodiment, control members with different functions (notification panel 82 and operation dial 90) are integrated as an operation notification unit 80. In particular, these control members are efficiently integrated by being placed on the front and back surfaces of the same circuit board, allowing the control members to be placed on the first surface (first surface part 34A) and the second surface (second surface part 34C) that constitute the corner. Furthermore, in this embodiment, the operation dial 90 is exposed to the handle part 31 that the operator grips, while the status of the grinder 10, as notified by the panel sheet 84, can be easily checked from above the grinder 10. Therefore, the operation notification unit 80 can be placed in a location that is efficient for work while miniaturizing the grinder 10. In particular, since the operation dial 90 is exposed to the handle part 31, the operation dial 90 can be easily operated while holding the handle part 31.

[0101] Furthermore, a battery mounting section 32B into which the battery 42 can be installed is provided on the rear side of the protruding section 34. This allows the battery 42 to be installed in the housing 20 without obstructing the housing of the operation notification unit 80 in the handle housing 30. Also, when the battery 42 is installed in the battery mounting section 32B, the battery 42 protrudes above the protruding section 34. Therefore, the protruding section 34 can be provided on the handle housing 30 without excessively protruding above the handle section 31. In other words, the increase in the size of the grinder 10 when the battery 42 is not installed can be suppressed.

[0102] Furthermore, the battery mounting section 32B extends along the inclined direction when viewed from the left-right direction (third direction). This makes it possible to reduce the vertical size of the grinder 10 compared to a configuration in which the battery mounting section 32B extends in the vertical direction.

[0103] Furthermore, in the operation notification unit 80, the circuit board 81 is arranged with the inclination direction as the thickness direction. The notification panel section 82 is located on one side (upper side) of the circuit board 81 in the inclination direction, and the speed setting section 87 is located on the other side (downward side) of the circuit board 81 in the inclination direction. As a result, compared to a configuration in which the circuit board 81 is arranged with the vertical direction as the thickness direction, the front end of the panel sheet 84 can be raised upward, and a portion of the operation dial 90 exposed to the front through the first exposure hole 34B can also be raised upward. This improves the visibility of the panel sheet 84 to an operator positioned behind the grinder 10, and also improves the operability of the operation dial 90.

[0104] In this embodiment, an example of applying the operation notification unit 80 to a grinder 10 has been described, but the operation notification unit 80 may also be applied to other work machines. An example of applying the operation notification unit 80 to other work machines will be described below.

[0105] First, using Figure 18, an example of applying the operation notification unit 80 to a well-known impact driver 100 (working machine) will be explained. In Figure 18, the arrow UP indicates the top side of the impact driver 100, and the arrow FR indicates the front side of the impact driver 100. Also, in Figure 18, the same reference numerals are used for parts that are configured similarly to the grinder 10 in this embodiment. The impact driver 100 is composed of a housing 110 that forms the outer casing of the impact driver 100, a motor 50 housed in the housing 110, a transmission mechanism 120, and an impact mechanism 130.

[0106] The housing 110 is formed in a roughly I-shape, hollow and extending vertically. The motor 50, transmission mechanism 120, and impact mechanism 130 are housed in the upper part of the housing 110. When the motor 50 is driven, its rotational force is transmitted to the impact mechanism 130 via the transmission mechanism 120, and rotational force is applied to the tip tool T attached to the impact mechanism 130.

[0107] The upper and lower middle section of the housing 110 is configured as a handle section 110A for the operator to grip, and a trigger 140 is provided at the upper end of the handle section 110A so as to be pullable. When the trigger 140 is operated, the motor 50 is driven. The lower end of the housing 110 is configured as a battery mounting section 110B in which the battery 42 is installed, and the controller 40 is housed in the battery mounting section 110B.

[0108] An overhang 112 is formed at the front end of the battery mounting section 110B, extending forward from the handle section 110A, and the operation notification unit 80 is housed in the overhang 112. The front surface of the overhang 112 is configured as a first surface section 112A, and a first exposed hole 112B, which is an open first hole, is formed through the first surface section 112A. The upper surface of the overhang 112 is configured as a second surface section 112C, and a second exposed hole 112D, which is an open second hole, is formed in the second surface section 112C. The notification panel section 82 of the operation notification unit 80 is exposed upward through the second exposed hole 112D, and the panel sheet 84 is configured to be visible. In addition, a part of the operation dial 90 of the speed setting section 87 of the operation notification unit 80 is exposed and operable through the first exposed hole 112B. As described above, even in the impact driver 100 to which the operation notification unit 80 is applied, since the operation notification unit 80 integrates the notification panel section 82 and the speed setting section 87, it is possible to improve workability while miniaturizing the impact driver 100, similar to the embodiment.

[0109] Next, an example of applying the operation notification unit 80 to a well-known hammer drill 200 (working machine) will be explained using Figure 19. In Figure 19, the arrow UP indicates the upper side of the hammer drill 200, and the arrow FR indicates the front side of the hammer drill 200. Also, in Figure 19, the same reference numerals are used for parts that are configured similarly to the grinder 10 in this embodiment. The hammer drill 200 is composed of a housing 210 that forms the outer casing of the hammer drill 200, and a motor 50 and a transmission mechanism 220 housed in the housing 210.

[0110] The housing 210 is formed in a hollow, roughly P-shape that extends in the front-to-back direction. The transmission mechanism 220 is housed in the upper part of the front of the housing 210, and the motor 50 is positioned in the lower part of the front of the housing 210 with the vertical direction as its axial direction. When the motor 50 is driven, the rotational force of the motor 50 is transmitted to the transmission mechanism 220, and rotational force is applied to the tip tool T attached to the transmission mechanism 220. The housing 210 also houses a controller 40 on the rear side of the transmission mechanism 220.

[0111] The rear end of the housing 210 is configured as a handle portion 210A for the operator to grip, and the handle portion 210A extends in the vertical direction. A trigger 230 is provided at the upper end of the handle portion 210A so as to be pullable. When the trigger 230 is operated, the motor 50 is driven. The lower rear end of the housing 210 is configured as a battery mounting portion 210B into which the battery 42 is mounted.

[0112] An overhang 212 is formed at the upper end of the handle portion 110A, extending above the housing 210, and the operation notification unit 80 is housed in the overhang 212. The rear surface of the overhang 212 is configured as a first surface portion 212A, and a first exposed hole 212B, which is an open first hole, is formed through the first surface portion 212A. The upper surface of the overhang 212 is configured as a second surface portion 212C, and a second exposed hole 212D, which is an open second hole, is formed in the second surface portion 212C. The notification panel portion 82 of the operation notification unit 80 is exposed upward through the second exposed hole 112D, and the panel sheet 84 is configured to be visible. In addition, a part of the operation dial 90 of the speed setting portion 87 of the operation notification unit 80 is exposed and operable through the first exposed hole 212B. As described above, in the hammer drill 200 to which the operation notification unit 80 is applied, since the operation notification unit 80 integrates the notification panel section 82 and the speed setting section 87, it is possible to improve workability while miniaturizing the hammer drill 200, similar to the embodiment. [Explanation of Symbols]

[0113] 10. Disc grinder (working tool) 13. Motor switches (electrical components) 20 Housing 21 Motor Housing 22 Motor housing cylinder 22C Receiving part (engaging part) 23 Handle support section (support section) 24 Switch retaining part (retaining part) 24B Upper wall of the switch holder 24F Lower wall of the switch holder 25 Front fixed support part (first support part) 26 Rear fixed support part (second support part) 28 Front wiring guide section (first guide section) 29 Rear wiring guide section (second guide section) 30 Handle Housing 31 Handle section 32 Rear housing section 36 Front fixed boss (1st supported part) 38 Rear fixed boss (second supported part) 39 Pressing part 50 motors

Claims

1. A motor having a rotation axis with the front-to-back direction as the axial direction, A housing that extends in the front-to-back direction, An output unit that is driven to rotate by the aforementioned motor, Equipped with, The aforementioned housing is A motor housing that houses the motor, A handle housing is configured separately from the motor housing, fixed to the motor housing at the rear of the motor housing, and configured to be separable in the left-right direction. It is composed of including, The tip tool fixed to the output unit allows the operator to perform work on an object located outside the housing and near the output unit by gripping the handle housing and bringing the tip tool into contact with the object. The rear of the handle housing is provided with a battery mounting section on which a battery for supplying power to the motor can be mounted. The motor housing is provided with a support portion having a first support portion and a second support portion that support the handle housing, and the first support portion and the second support portion are arranged to be spaced apart in the front-rear direction. The support portion is provided with a holding portion for holding electrical components for controlling the motor. A work machine in which the holding portion is positioned between the first support portion and the second support portion in the front-rear direction.

2. The motor housing is A motor housing cylinder that houses the motor, The support portion extends to the rear from the motor housing cylinder, It is composed of including, The work machine according to claim 1, wherein the support portion is arranged inside the handle housing, and the handle housing is fastened and fixed to the first support portion and the second support portion.

3. The handle housing comprises a handle portion and a rear housing portion located behind the handle portion. The support portion is located inside the handle portion. The work machine according to claim 1 or 2, wherein the controller for controlling the motor is provided in the rear housing and is held in place by the handle housing.

4. The output unit is a spindle that is rotationally driven by the motor, The work machine according to claim 1, wherein the spindle is configured to allow the attachment and detachment of a tip tool for processing the workpiece.

5. The holding portion is formed in a concave shape that is open to one side in the left-right direction. The work machine according to claim 1, wherein the handle housing has a pressing portion formed thereon, which is sandwiched from both the upper and lower sides by the tip of the upper wall and the tip of the lower wall of the holding portion.

6. The work machine according to claim 1, wherein the first support portion is provided in a pair, upper and lower, on the front side of the holding portion, and the second support portion is provided on the rear side of the holding portion.

7. The handle housing is provided with a first supported portion that is supported by the first support portion, A portion of the wiring extending from the motor is routed to one side of the support portion in the left-right direction. The work machine according to claim 1, wherein the first support portion is formed with a first guide portion that suppresses interference between the first supported portion and the wiring.

8. The handle housing is provided with a second supported portion which is supported by the second support portion. A portion of the wiring extending from the electrical component is routed to one side of the support portion in the left-right direction. The work machine according to claim 1, wherein the second support portion is formed with a second guide portion that suppresses interference between the second supported portion and the wiring.

9. The work machine according to claim 3, wherein the second support portion is positioned below the vertical center of the handle portion.

10. The work machine according to claim 3, wherein the motor housing has an engaging portion formed therein that receives the inner circumferential surface of the front end of the handle portion and is configured to engage with the front end of the handle portion in the front-rear direction.

11. The work machine according to any one of claims 1 to 10, wherein the motor housing is composed of a single, indivisible component.

12. The work machine according to claim 1, wherein the electrical component is a switch for turning the motor on and off.

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