Attachment device and electric excavator

Abstract

The present application provides an attachment device and an electric excavator, which aims to assist in excavating work to form a target hole at an excavating object. The attachment device is attached to the electric excavator. The electric excavator is provided with a motor housing for accommodating a motor, a handle housing arranged at the rear side of the motor housing and provided with a grip portion provided with a trigger switch for starting the motor, a gear housing arranged at the front side of the motor housing for accommodating a gear, and a rotary output portion protruding downward from the gear housing and provided with a drill bit. The attachment device is provided with an auxiliary rod arranged in the up-down direction at a position adjacent to the drill bit.

Description

Technical Field

[0001] The technology disclosed in this specification relates to an auxiliary device and an electric excavator. Background Technology

[0002] In the technical field related to electric excavators, there are known power tools, such as those disclosed in Patent Document 1, that rotate a posthole drill bit to excavate the ground. The power tool disclosed in Patent Document 1, when held by the operator, rotates the posthole drill bit to create a hole in the ground.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-196098 Summary of the Invention

[0006] When an electric excavator is operated by an operator, it may be difficult to create a target hole at the excavation site. There is a need for technology that can assist in the excavation process to create a target hole at the excavation site.

[0007] The purpose of the technology disclosed in this specification is to assist in the excavation operation to form a target hole at the excavation site when using a portable electric excavator to excavate an object.

[0008] This specification discloses an accessory device mounted on an electric excavator. The electric excavator may include: a motor housing that houses the motor; a handle housing located at the rear of the motor housing and having a grip portion with a trigger switch for starting the motor; a gear housing located at the front of the motor housing for housing the gear; and a rotary output portion that protrudes downward from the gear housing and is used for mounting a drill bit. The accessory device may include an auxiliary rod arranged vertically adjacent to the drill bit.

[0009] Invention Effects

[0010] According to the techniques disclosed in this specification, an auxiliary excavation operation is performed to form a target hole at the excavation target. Attached Figure Description

[0011] Figure 1 This is a perspective view of the electric excavator of the first embodiment as seen from the front.

[0012] Figure 2 This is a perspective view of the electric excavator of the first embodiment as viewed from the rear.

[0013] Figure 3 This is a side view of the electric excavator according to the first embodiment.

[0014] Figure 4 This is a cross-sectional view of the electric excavator according to the first embodiment.

[0015] Figure 5 This is an exploded perspective view showing a portion of the accessory device of the first embodiment as viewed from the front.

[0016] Figure 6 This is an exploded perspective view showing a portion of the accessory device of the first embodiment as viewed from the rear.

[0017] Figure 7 This is a perspective view showing a portion of the accessory device of the first embodiment as viewed from the front.

[0018] Figure 8 This is a perspective view showing a portion of the accessory device of the first embodiment as viewed from the rear.

[0019] Figure 9 This is a perspective view showing an electric excavator equipped with a portion of the auxiliary device of the first embodiment, viewed from the front.

[0020] Figure 10 This is a perspective view showing an electric excavator equipped with a portion of the accessory device of the first embodiment, viewed from the rear.

[0021] Figure 11 This is a perspective view showing an electric excavator equipped with a portion of the auxiliary device of the first embodiment, viewed from the front.

[0022] Figure 12 This is a perspective view showing an electric excavator equipped with a portion of the accessory device of the first embodiment, viewed from the rear.

[0023] Figure 13 This is a perspective view of an electric excavator equipped with the auxiliary devices of the first embodiment, viewed from the front.

[0024] Figure 14 This is a perspective view of an electric excavator equipped with the auxiliary devices of the first embodiment, viewed from the rear.

[0025] Figure 15 This is a left view of an electric excavator equipped with the auxiliary device of the first embodiment.

[0026] Figure 16 This is a right view of an electric excavator equipped with the auxiliary device of the first embodiment.

[0027] Figure 17This is a top view of an electric excavator equipped with the auxiliary devices of the first embodiment.

[0028] Figure 18 This is a bottom view of an electric excavator equipped with the auxiliary device of the first embodiment.

[0029] Figure 19 This is a rear view of an electric excavator equipped with the accessory device of the first embodiment.

[0030] Figure 20 This is a front view of an electric excavator equipped with the auxiliary devices of the first embodiment.

[0031] Figure 21 This is an exploded perspective view showing the auxiliary rod of the first embodiment.

[0032] Figure 22 This is a perspective view showing the auxiliary rod and retaining component of the first embodiment.

[0033] Figure 23 This is a side view illustrating the method of using an electric excavator equipped with the auxiliary device of the first embodiment.

[0034] Figure 24 This is a top view illustrating the method of using an electric excavator equipped with the auxiliary device of the first embodiment.

[0035] Figure 25 This is a perspective view of an electric excavator equipped with the auxiliary device of the second embodiment, viewed from the front.

[0036] Figure 26 This is a perspective view of an electric excavator equipped with the auxiliary devices of the second embodiment, viewed from the rear.

[0037] Figure 27 This is a left view of an electric excavator equipped with the auxiliary device of the second embodiment.

[0038] Figure 28 This is a right view of an electric excavator equipped with the accessory device of the second embodiment.

[0039] Figure 29 This is a top view of an electric excavator equipped with the auxiliary device of the second embodiment.

[0040] Figure 30 This is a bottom view of an electric excavator equipped with the auxiliary device of the second embodiment.

[0041] Figure 31 This is a rear view of an electric excavator equipped with the accessory device of the second embodiment.

[0042] Figure 32 This is a front view of an electric excavator equipped with the auxiliary device of the second embodiment.

[0043] Figure 33 This is a perspective view showing the auxiliary rod and retaining component of the second embodiment.

[0044] Figure 34 This is a cross-sectional view showing the auxiliary rod and retaining member of the second embodiment.

[0045] Figure 35 This is a perspective view showing the auxiliary devices and electric excavator of the second embodiment as viewed from the front.

[0046] Figure 36 This is a right view showing the auxiliary device and electric excavator of the second embodiment.

[0047] Figure 37 This is a perspective view showing a modified example of the auxiliary rod and retaining member of the second embodiment as viewed from the front.

[0048] Figure 38 This is a perspective view of an electric excavator equipped with the auxiliary device of the third embodiment, viewed from the front.

[0049] Figure 39 This is a perspective view of an electric excavator equipped with the auxiliary devices of the third embodiment, viewed from the rear.

[0050] Figure 40 This is a left view of an electric excavator equipped with the accessory device of the third embodiment.

[0051] Figure 41 This is a right view of an electric excavator equipped with the accessory device of the third embodiment.

[0052] Figure 42 This is a top view of an electric excavator equipped with the auxiliary device of the third embodiment.

[0053] Figure 43 This is a bottom view of an electric excavator equipped with the accessory device of the third embodiment.

[0054] Figure 44 This is a rear view of an electric excavator equipped with the accessory device of the third embodiment.

[0055] Figure 45 This is a front view of an electric excavator equipped with the auxiliary device of the third embodiment.

[0056] Figure 46 This is a side view used to illustrate the method of using the electric excavator according to the third embodiment.

[0057] Figure 47 This is a front view used to illustrate the method of using the electric excavator according to the third embodiment.

[0058] Figure 48 This is a perspective view of the electric excavator of the fourth embodiment as seen from the front.

[0059] Figure 49 This is a perspective view of the electric excavator of the fifth embodiment as viewed from the front.

[0060] Symbol Explanation

[0061] 1A…Electric excavator, 1B…Electric excavator, 2…Motor housing, 2E…Exhaust port, 3…Handle housing, 3A…Front section, 3B…Grip section, 3C…Controller storage section, 3D…Battery connection section, 4…Gear housing, 4A…Cover, 5…Rotary output section, 5A…Adapter, 5B…Fixed component, 6…Front grip, 6C…Screw opening, 6H…Bridge section, 6L…Left arm section, 6R…Right arm section, 7…Battery assembly section, 8…Motor, 9…Forward / reverse switch lever, 10…Main switch, 11…Trigger switch, 11A…Trigger lever, 11B…Switch circuit, 13…Controller, 14…Reduction mechanism, 15…Speed ​​switch lever, 16…Screw hole, 17…Battery pack, 17C…Release button, 18…Screw hole, 19…Drill bit, 19A…Digging spindle, 19B…Digging blade, 19C…Front end drill, 19D…Cutting drill, 19U…Lower end, 20…Auxiliary handle, 21…Handle connector, 21A…Main body, 21B…Screw boss, 21C…Screw boss, 21L…Left handle connector, 21R…Right handle connector, 22…Handle, 22L…Left rod, 22R…Right rod, 22C…Connecting rod, 22E…Cap, 23…Reaction force receiving component, 23A…Fixed rod, 23B…Extending rod, 23C…Cap, 23D…Cap, 23E…Screw opening, 24…Handle hole, 25…Inner recess, 26…Outer recess, 27…Screw hole, 28…Screw opening, 29…Screw opening, 30…Screw opening 31…screw, 32…screw, 33…screw, 34…screw, 35…screw, 36…screw, 37…screw, 40…auxiliary rod, 40A…tube section, 40B…foot section, 40C…cap section, 40D…screw opening, 40E…plug section, 40F…flange section, 40U…lower end, 41…holding member, 42…screw opening, 43…holding mechanism, 44…clamping section, 44A…arc section, 44B…plate section, 44C…plate section, 45…hinge, 46…rod, 47…screw, 51…spindle, 52…drill chuck, 52A…insertion hole, 53…needle roller bearing, 54…ball bearing, 55…bevel gear, 60…holding member, 61…first holding member, 61A…upper surface, 61B… Lower surface, 61H…retaining hole, 61L…recess, 61R…recess, 62…second retaining member, 62A…upper surface, 62B…lower surface, 62H…retaining hole, 62L…recess, 62R…recess, 63…screw opening, 64…screw hole, 65…screw, 65A…screw, 65B…screw, 65C…screw, 65D…screw, 65E…screw, 66…cap, 67…screw opening, 73…retaining mechanism, 74…clamping part, 74A…arc part, 74B…plate part, 74C…plate part, 75…hinge, 76…rod, 77…screw, 81…stator, 81A…stator core, 81B…front insulator, 81C…rear insulator, 81D…coil, 81E…sensor circuit board,81F… Wiring component, 82… Rotor, 82A… Rotor shaft, 82B… Rotor core, 82C… Permanent magnet, 83… Bearing, 84… Bearing, 85… Centrifugal fan, 90… Auxiliary plate, 90A… Front end, 91… Screw opening, 92… Opening, 93… Slit opening, 94… Opening, 100… Accessory, 101… Accessory, 102… Accessory, 141… First planetary gear mechanism, 141C… First gear carrier, 141P… Planetary gear, 141R… Internal gear, 141S… Pinion, 142… Second planetary gear mechanism, 142C… Second gear carrier, 142P… Planetary gear, 142R… Internal gear, 142S… Sun gear, 143… Intermediate shaft, 144…Output shaft, 145…Support pin, 146…Support pin, 147…Bearing, 148…Bevel gear, 150…Switching component, 150H…Hole, 151…Connecting component, 151H…Hole, 202…Motor housing, 203L…First grip, 203R…Second grip, 204…Gear housing, 205…Rotary output part, 211…Trigger switch, 217…Battery, 219…Drill bit, 240…Auxiliary rod, 290…Auxiliary plate, AX…Rotary shaft, BX…Rotary shaft, Gr…Reaction force, Hr…Reaction force, Ra…Specified direction, Vr…Reaction force, Ya…Tightening direction, Yb…Loosening direction, Yc…Tightening direction, Yd…Loosening direction, ΔD…Distance. Detailed Implementation

[0062] In one or more embodiments, the auxiliary device is mounted on an electric excavator. The electric excavator may include: a motor housing that houses the motor; a handle housing located at the rear of the motor housing and having a grip portion with a trigger switch for starting the motor; a gear housing located at the front of the motor housing for housing the gear; and a rotary output portion protruding downward from the gear housing and for mounting a drill bit. The auxiliary device may include an auxiliary rod arranged vertically adjacent to the drill bit.

[0063] In the above configuration, the auxiliary rod assists in the excavation operation to form a target hole at the excavation target. A hole is formed at the excavation target by rotating the drill bit. The target hole is formed at the excavation target by the auxiliary rod contacting the surface of the excavation target surrounding the hole formed by the drill bit.

[0064] In one or more embodiments, the lower end of the auxiliary rod may be configured to be positioned higher than the lower end of the drill bit.

[0065] In the above configuration, the lower end of the auxiliary rod is positioned higher than the lower end of the drill bit, thereby forming a hole of the target depth at the excavation site. The vertical distance between the lower end of the auxiliary rod and the lower end of the drill bit's digging edge is determined by the target depth of the hole. By performing digging operations, the lower end of the auxiliary rod contacts the surface of the excavation site surrounding the hole formed by the drill bit, thereby forming a hole of the target depth at the excavation site.

[0066] In one or more embodiments, the auxiliary device may include: an auxiliary handle that is detachable from the gear housing; and a retaining member that is detachable from at least a portion of the auxiliary handle. The auxiliary rod may be retained in the retaining member.

[0067] In the above configuration, the auxiliary handle is held by the operator's hand, thereby enabling smooth excavation operations. The auxiliary rod is supported by the auxiliary handle by a retaining component, so the operator can hold the auxiliary handle and create a hole at the target depth at the excavation site.

[0068] In one or more embodiments, the retaining member may have a retaining mechanism that retains the auxiliary rod in a detachable manner. The retaining mechanism may include: a clamping portion disposed around at least a portion of the auxiliary rod; and a rod connected to the clamping portion by means of a hinge. Rotation of the rod in the tightening direction can fix the auxiliary rod to the clamping portion. Rotation of the rod in the loosening direction can release the clamping portion from the auxiliary rod.

[0069] In the above configuration, the position of the auxiliary rod relative to the retaining member in the vertical direction is fixed by rotating the rod in the fastening direction. The position of the auxiliary rod relative to the retaining member in the vertical direction is adjusted by rotating the rod in the slack direction.

[0070] In one or more embodiments, the auxiliary handle may have: a handle joint fixed to the gear housing, and a handle fixed to the handle joint. A retaining member may be fixed to the handle joint.

[0071] In the above configuration, the retaining component is fixed to the gear housing via a handle connector. The operator can hold the handle by hand.

[0072] In one or more embodiments, the handle connector may include: a left handle connector fixed to the left side of the gear housing, and a right handle connector fixed to the right side of the gear housing. A retaining member may be fixed to one of the left and right handle connectors, and a reaction force receiving member may be fixed to the other handle connector.

[0073] In the above configuration, the operator can receive the reaction force transmitted from the rotating output unit to the gear housing via the reaction force receiving component. This suppresses instability in the electric excavator's posture or swaying of the operator holding the excavator. Consequently, a target hole is formed at the excavation target. Furthermore, since interference between the auxiliary rod and the reaction force receiving component is suppressed, excavation operations can be carried out smoothly.

[0074] In one or more embodiments, the handle connector may have screw holes. The retaining member may have a plurality of screw openings spaced apart along the front-rear direction. The handle connector and the retaining member can be secured by inserting screws into the screw holes through the screw openings. The position of the auxiliary rod in the front-rear direction can be adjusted by selecting the screw openings for screw insertion.

[0075] In the above configuration, the position of the auxiliary rod in the front-to-back direction can be easily adjusted. The distance between the drill bit and the auxiliary rod in the front-to-back direction can be appropriately adjusted according to the conditions of the work site.

[0076] In one or more embodiments, the auxiliary handle may have: a handle joint fixed to the gear housing, and a handle fixed to the handle joint. A retaining member may be fixed to the handle.

[0077] In the above configuration, the retaining component is fixed to the gear housing by means of the handle and handle connector.

[0078] In one or more embodiments, the retaining member may include a first retaining member and a second retaining member configured to be positioned further below the first retaining member. The first and second retaining members may be configured to clamp the handle in a vertical direction.

[0079] In the above configuration, the first retaining member and the second retaining member are configured to clamp the handle from the vertical direction, thereby stabilizing the fixation between the retaining member and the handle.

[0080] In one or more embodiments, one of the first and second retaining members may have a screw opening. The other retaining member may have a screw hole. By inserting a screw through the screw opening into the screw hole, the first retaining member, the second retaining member, and the handle can be secured.

[0081] In the above configuration, screws are used to fix the first retaining member, the second retaining member, and the handle.

[0082] In one or more embodiments, the handle may be configured to extend forward from the handle joint. The position of the auxiliary rod in the forward / backward direction can be adjusted by releasing the fixation of the first and second retaining members relative to the handle using screws.

[0083] In the above configuration, the position of the auxiliary rod in the front-to-back direction can be easily adjusted. The distance between the drill bit and the auxiliary rod in the front-to-back direction can be appropriately adjusted according to the conditions of the work site.

[0084] In one or more embodiments, the handle connector may include: a left handle connector fixed to the left side of the gear housing, and a right handle connector fixed to the right side of the gear housing. The handle may include: a left rod extending forward from the left handle connector, a right rod extending forward from the right handle connector, and a connecting rod connecting the front ends of the left and right rods. A retaining member may be fixed to the left and right rods respectively. In the left-right direction, an auxiliary rod may be positioned further outward than one of the handle connectors, and a reaction force receiving member may be fixed to the other handle connector.

[0085] In the above configuration, the retaining components are fixed to the left and right rods respectively, thus ensuring stable fixation between the retaining components and the handle. The operator can receive the reaction force transmitted from the rotating output section to the gear housing via the reaction force receiving component. This suppresses instability in the electric excavator's posture or swaying of the operator. Consequently, a target hole is formed at the excavation site. Furthermore, interference between the auxiliary rod and the reaction force receiving component is suppressed, allowing for smooth excavation operations.

[0086] In one or more embodiments, the auxiliary device is mounted on an electric excavator. The electric excavator may include: a motor housing that houses the motor; a handle housing located at the rear of the motor housing and having a grip portion with a trigger switch for starting the motor; a gear housing located at the front of the motor housing for housing the gear; and a rotary output portion protruding downward from the gear housing and for mounting a drill bit. The auxiliary device may include an auxiliary plate located on at least one of the left and right sides of the gear housing, capable of receiving the reaction force transmitted from the rotary output portion to the gear housing.

[0087] In the above configuration, the auxiliary plate assists in the digging operation to create a target hole at the excavation target. The operator can receive the reaction force transmitted from the rotary output unit to the gear housing using the auxiliary plate. Accordingly, instability in the electric excavator's posture or swaying of the operator holding the electric excavator is suppressed. Therefore, a target hole is created at the excavation target.

[0088] In one or more embodiments, the front end of the auxiliary plate may be configured to be further forward than the front end of the gear housing.

[0089] In the above configuration, since the auxiliary plate is larger than the gear housing, the operator can receive the reaction force transmitted from the rotating output part to the gear housing with the help of the auxiliary plate.

[0090] In one or more embodiments, the auxiliary device may include an auxiliary handle that is detachable from the gear housing. An auxiliary plate may be fixed to at least a portion of the auxiliary handle. The auxiliary handle may have: a handle connector including a left handle connector fixed to the left side of the gear housing and a right handle connector fixed to the right side of the gear housing, and a handle fixed to the handle connector. The auxiliary plate may be fixed to one of the left and right handle connectors.

[0091] In the above configuration, the auxiliary handle is held by the operator's hand, thereby enabling smooth digging operations. The auxiliary handle assists in the digging operation to form the target hole. The auxiliary plate is fixed to one of the handle joints of the left and right handles, so the operator can receive the reaction force transmitted from the rotating output to the gear housing with the aid of the auxiliary handle and the auxiliary plate.

[0092] In one or more embodiments, the electric excavator may include: a motor housing that houses the motor; a handle housing disposed at the rear of the motor housing and having a grip portion with a trigger switch; a gear housing disposed at the front of the motor housing for housing the gear; a rotary output portion that protrudes downward from the gear housing and is used for mounting a drill bit; and the aforementioned auxiliary devices.

[0093] In the above configuration, the target hole is formed at the excavation site by using auxiliary devices to assist the excavation operation.

[0094] In one or more embodiments, the electric excavator may include: a motor housing that houses the motor; a first grip portion disposed on the left side of the motor housing; a second grip portion disposed on the right side of the motor housing; a trigger switch for starting the motor; a gear housing connected to the motor housing for housing the gear; a rotary output portion that protrudes downward from the gear housing and is used for mounting a drill bit; and an auxiliary rod disposed vertically adjacent to the drill bit.

[0095] In the above configuration, the auxiliary rod assists in the excavation operation to form a target hole at the excavation target. A hole is formed at the excavation target by rotating the drill bit. The target hole is formed at the excavation target by the auxiliary rod contacting the surface of the excavation target surrounding the hole formed by the drill bit.

[0096] In one or more embodiments, the lower end of the auxiliary rod may be configured to be positioned higher than the lower end of the drill bit.

[0097] In the above configuration, the lower end of the auxiliary rod is positioned higher than the lower end of the drill bit, thereby forming a hole of the target depth at the excavation site. The vertical distance between the lower end of the auxiliary rod and the lower end of the drill bit's digging edge is determined by the target depth of the hole. By performing digging operations until the lower end of the auxiliary rod contacts the surface of the excavation site surrounding the hole formed by the drill bit, a hole of the target depth is formed at the excavation site.

[0098] In one or more embodiments, the auxiliary rod can be disposed on the left or right side of the rotating output section, and can move in the vertical direction and be fixed at a predetermined position in the vertical direction.

[0099] In the above configuration, since the auxiliary rod is positioned on the left or right side of the rotating output section, it is possible to prevent the auxiliary rod from obstructing the digging operation. Furthermore, since the vertical position of the auxiliary rod is adjustable, a hole of the target depth can be formed at the digging target.

[0100] In one or more embodiments, the auxiliary rod may be installed in at least one of the motor housing and the gear housing.

[0101] In the above configuration, since the auxiliary rod is installed at an appropriate location on the electric excavator, it is possible to prevent the auxiliary rod from obstructing the excavation operation.

[0102] In one or more embodiments, the electric excavator may include: a motor housing that houses the motor; a first grip portion disposed on the left side of the motor housing; a second grip portion disposed on the right side of the motor housing; a trigger switch for starting the motor; a gear housing connected to the motor housing for housing the gear; a rotary output portion that protrudes downward from the gear housing and is used for mounting a drill bit; and an auxiliary plate mounted on at least one of the motor housing and the gear housing, so that the operator's body receives the reaction force generated by the rotation of the rotary output portion.

[0103] In the above configuration, the auxiliary plate assists in the digging operation to form a target hole at the object being dug. The operator can receive the reaction force transmitted from the rotary output unit to the gear housing using the auxiliary plate. Accordingly, instability in the electric excavator's posture, or swaying of the operator holding the electric excavator, is suppressed. Therefore, a target hole is formed at the object being dug.

[0104] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings; however, the present invention is not limited to these embodiments. The constituent elements of the embodiments described below can be appropriately combined. In addition, sometimes some constituent elements are not used.

[0105] In the implementation method, the terms "left," "right," "front," "rear," "up," and "down" are used to describe the positional relationships of each part. These terms indicate the relative position or direction with the center of the electric excavator as a reference.

[0106] [First Implementation Method]

[0107] <Electric Excavator>

[0108] Figure 1 This is a perspective view showing the electric excavator 1A of this embodiment as viewed from the front. Figure 2 This is a perspective view showing the electric excavator 1A of this embodiment as viewed from the rear. Figure 3 This is a side view showing the electric excavator 1A according to this embodiment. Figure 4 This is a cross-sectional view showing the electric excavator 1A according to this embodiment.

[0109] Electric excavator 1A is a portable electric excavator that excavates an object while being held by an operator, thereby creating an exit hole at the object. In this embodiment, the object being excavated is the ground.

[0110] The electric excavator 1A includes: a motor housing 2, a handle housing 3, a gear housing 4, a front grip 6, a battery assembly 7, a controller 13, a main switch 10, a trigger switch 11, a forward / reverse switching lever 9, a speed switching lever 15, a motor 8, a reduction gear 14, and a rotary output unit 5.

[0111] The motor housing 2 houses the motor 8. The motor housing 2 is cylindrical. The motor housing 2 is made of synthetic resin. The motor housing 2 has an exhaust port 2E connecting the internal space and the external space of the motor housing 2. Exhaust ports 2E are respectively provided on the left, right and lower parts of the motor housing 2. Air in the internal space of the motor housing 2 is discharged to the external space through the exhaust ports 2E.

[0112] The handle housing 3 is located on the rear side of the motor housing 2. The front part of the handle housing 3 is connected to the rear part of the motor housing 2. The handle housing 3 is a ring-shaped part that is longer in the front-to-back direction. The handle housing 3 is made of synthetic resin. The handle housing 3 has: a front part 3A, which is connected to the rear part of the motor housing 2; a grip part 3B, which extends rearward from the upper part of the front part 3A; a controller storage part 3C, which extends rearward from the lower part of the front part 3A; and a battery connection part 3D, which connects the rear end of the grip part 3B and the rear end of the controller storage part 3C. The grip part 3B is positioned higher than the controller storage part 3C. The grip part 3B is located on the rear side of the motor housing 2. The operator can grip the grip part 3B by hand.

[0113] The gear housing 4 houses the reduction gear 14. The gear housing 4 is cylindrical. The gear housing 4 is located on the front side of the motor housing 2. The rear of the gear housing 4 is connected to the front of the motor housing 2. The gear housing 4 is made of aluminum. At least a portion of the surface of the gear housing 4 is covered by a cover 4A. In this embodiment, the cover 4A is a double-layer structure of synthetic resin and elastomer.

[0114] A front grip 6 is fixed to the gear housing 4. The front grip 6 has: a left arm portion 6L, fixed to the left side of the gear housing 4; a right arm portion 6R, fixed to the right side of the gear housing 4; and a bridging portion 6H, connecting the upper ends of the left arm portion 6L and the right arm portion 6R. The bridging portion 6H is configured to be positioned higher than the upper surface of the gear housing 4. The bridging portion 6H and the gear housing 4 are positioned opposite each other with a gap. The front grip 6 is located on the front side of the motor housing 2. The operator can grip the front grip 6.

[0115] Screw openings 6C are provided at the lower ends of the left arm 6L and the right arm 6R, respectively. Screw holes 16 are provided on the left and right sides of the gear housing 4. In the front-back direction, the positions of the screw holes 16 and the rotary output part 5 are substantially the same.

[0116] Screw holes 18 are provided on the left and right sides of the gear housing 4. The screw holes 18 are located behind and below the screw holes 16.

[0117] A battery assembly 7 is located at the rear of the handle housing 3. A battery pack 17 is mounted on the battery assembly 7. The battery assembly 7 is located at the battery connection portion 3D of the handle housing 3. In this embodiment, two battery assembly 7s are provided along the vertical direction. By mounting the battery pack 17 on each of the two battery assembly 7s, two battery packs 17 are arranged along the vertical direction. The battery packs 17 can be attached to and detached relative to the battery assembly 7s. By being mounted on the battery assembly 7s, the battery packs 17 can supply power to the electric excavator 1A.

[0118] The battery pack 17 includes a secondary battery. In this embodiment, the battery pack 17 includes a rechargeable lithium-ion battery. The battery pack 17 has a release button 17C. By operating the release button 17C, the fixation between the battery assembly 7 and the battery pack 17 can be released. The release button 17C is located on the left surface of the battery pack 17.

[0119] The controller 13 outputs control signals to control the electric excavator 1A. The controller housing 3C has an internal space for storing the controller 13. The controller 13 is stored in the controller housing 3C.

[0120] The main switch 10 is operated by the operator to start the electric excavator 1A. The main switch 10 is located on the upper part of the front section 3A. Operating the main switch 10 supplies power from the battery pack 17 to the controller 13, thus starting the electric excavator 1A. Operating the main switch 10 also switches between starting and stopping the electric excavator 1A.

[0121] The trigger switch 11 is operated by the operator to start the motor 8. The trigger switch 11 is located in the grip 3B. The trigger switch 11 includes a trigger lever 11A and a switch circuit 11B. The trigger lever 11A protrudes downwards from the lower part of the front of the grip 3B. With one hand gripping the grip 3B, the operator can operate the trigger lever 11A by moving it upwards with their fingers. The grip 3B has an internal space for housing the switch circuit 11B. The switch circuit 11B is housed within the grip 3B. Operating the trigger lever 11A causes the switch circuit 11B to output an operation signal. When the electric excavator 1A is running, operating the trigger lever 11A upwards pulls it, thereby supplying power to the motor 8 from the battery pack 17, and the motor 8 starts. The motor 8 is driven based on the operation signal output from the switch circuit 11B. The driving and stopping of motor 8 are switched by switching the operation and release of trigger lever 11A.

[0122] The forward / reverse switching lever 9 is operated by the operator to switch the rotation direction of the motor 8. The forward / reverse switching lever 9 is located at the front 3A. By operating the forward / reverse switching lever 9 in the left-right direction, the rotation direction of the motor 8 is switched between the forward and reverse directions. Switching the rotation direction of the motor 8 also switches the rotation direction of the rotary output unit 5 between the forward and reverse directions.

[0123] The speed switching lever 15 is operated by the operator to switch the rotational speed of the rotary output unit 5. The speed switching lever 15 is located at the lower part of the gear housing 4. By operating the speed switching lever 15 in the forward and backward direction, the rotational speed of the rotary output unit 5 is switched between a first speed and a second speed that is higher than the first speed.

[0124] Motor 8 generates rotational force to rotate the rotary output unit 5. Motor 8 is driven by power supplied from battery pack 17. Motor 8 is an internal rotor type brushless motor. Motor 8 has a cylindrical stator 81 and a rotor 82 disposed inside the stator 81. The rotation axis AX of rotor 82 extends in the front-rear direction.

[0125] The stator 81 includes: a stator core 81A comprising multiple stacked steel plates; a front insulator 81B disposed at the front of the stator core 81A; a rear insulator 81C disposed at the rear of the stator core 81A; multiple coils 81D wound around the stator core 81A via the front insulator 81B and the rear insulator 81C; a sensor circuit board 81E mounted on the rear insulator 81C; and a wiring component 81F supported on the rear insulator 81C. The sensor circuit board 81E has multiple rotation detection elements for detecting the rotation of the rotor 82.

[0126] The rotor 82 includes: a rotor shaft 82A; a cylindrical rotor core 82B disposed around the rotor shaft 82A; and a plurality of permanent magnets 82C held in place by the rotor core 82B. The front portion of the rotor shaft 82A is rotatably supported by a bearing 83. The rear portion of the rotor shaft 82A is rotatably supported by a bearing 84.

[0127] A centrifugal fan 85 is mounted on the rotor shaft 82A between the bearing 83 and the stator 81. The exhaust port 2E of the motor housing 2 is located around a portion of the centrifugal fan 85. As the rotor shaft 82A rotates, the centrifugal fan 85 rotates, thereby discharging air from the interior space of the motor housing 2 to the exterior space of the motor housing 2 through the exhaust port 2E.

[0128] A pinion 141S is provided at the front end of the rotor shaft 82A. The pinion 141S is disposed inside the gear housing 4. The rotor shaft 82A is connected to the reduction mechanism 14 by means of the pinion 141S.

[0129] The reduction mechanism 14 transmits the rotational force generated by the motor 8 to the rotational output unit 5. The reduction mechanism 14 transmits rotational force from the rotor shaft 82A to the rotational output unit 5. The reduction mechanism 14 includes multiple gears. The reduction mechanism 14 has: a first planetary gear mechanism 141, a second planetary gear mechanism 142, an intermediate shaft 143, and an output shaft 144.

[0130] The first planetary gear mechanism 141 is positioned in front of the rotor shaft 82A. The intermediate shaft 143 is positioned in front of the first planetary gear mechanism 141. The second planetary gear mechanism 142 is positioned in front of the intermediate shaft 143. The output shaft 144 is positioned in front of the second planetary gear mechanism 142.

[0131] The first planetary gear mechanism 141 includes: a pinion 141S that functions as a sun gear; a plurality of planetary gears 141P disposed around the pinion 141S; a first gear carrier 141C that supports the plurality of planetary gears 141P for rotation; an internal gear 141R disposed around the plurality of planetary gears 141P; and a support pin 145 held in the first gear carrier 141C.

[0132] A pinion 141S is located at the front end of the rotor shaft 82A. Multiple planetary gears 141P mesh with the pinion 141S and the internal gear 141R, respectively. A first gear carrier 141C holds a support pin 145. The support pin 145 extends in the front-rear direction. The support pin 145 is connected to the planetary gears 141P. The first gear carrier 141C supports the planetary gears 141P for rotation via the support pin 145.

[0133] The second planetary gear mechanism 142 includes: a sun gear 142S; a plurality of planetary gears 142P disposed around the sun gear 142S; a second gear carrier 142C supporting the plurality of planetary gears 142P for rotation; an internal gear 142R disposed around the plurality of planetary gears 142P; and a support pin 146 held in the second gear carrier 142C.

[0134] A sun gear 142S is located at the front end of the intermediate shaft 143. Multiple planetary gears 142P mesh with the sun gear 142S and the internal gear 142R, respectively. A second gear carrier 142C holds a support pin 146. The support pin 146 extends in the front-rear direction. The support pin 146 protrudes rearward from the second gear carrier 142C. The support pin 146 supports the planetary gears 142P for rotation. The rear end of the support pin 146 protrudes rearward from the planetary gears 142P. The second gear carrier 142C supports the planetary gears 142P for rotation via the support pin 146.

[0135] The internal gear 141R of the first planetary gear mechanism 141 is fixed to the gear housing 4. The internal gear 141R does not rotate. The internal gear 142R of the second planetary gear mechanism 142 can rotate.

[0136] The output shaft 144 is rotatably supported by the bearing 147. The rear end of the output shaft 144 is fixed to the second gear carrier 142C. A bevel gear 148 is provided at the front end of the output shaft 144. The front end of the output shaft 144 is connected to the rotary output unit 5 via the bevel gear 148. When the second gear carrier 142C rotates, the second gear carrier 142C and the output shaft 144 rotate together.

[0137] The rotating shaft AX of rotor shaft 82A, the rotating shaft of first gear carrier 141C, the rotating shaft of intermediate shaft 143, the rotating shaft of second gear carrier 142C, and the rotating shaft of output shaft 144 are the same.

[0138] The reduction mechanism 14 includes a switching member 150 movable in the front-rear direction between the first planetary gear mechanism 141 and the second planetary gear mechanism 142. The switching member 150 is disposed around the intermediate rotating shaft 143. The switching member 150 is connected to a speed switching lever 15. The switching member 150 is moved in the front-rear direction by operating the speed switching lever 15. An operator can operate the speed switching lever 15 to move the switching member 150 in the front-rear direction.

[0139] The switching component 150 is positioned in front of the first gear carrier 141C. The front portion of the support pin 145 protrudes forward from the first gear carrier 141C. The switching component 150 has a hole 150H into which the support pin 145 protruding forward from the first gear carrier 141C is inserted. The switching component 150 is movable in the front-rear direction by being guided by the support pin 145. By moving the switching component 150 in the front-rear direction, the rotational speed of the rotary output unit 5 is switched.

[0140] Additionally, the reduction mechanism 14 includes a connecting member 151 disposed at the rear of the planetary gear 142P. The connecting member 151 has a hole 151H into which a support pin 146 protruding rearward from the planetary gear 142P is inserted. The connecting member 151 is connected to the second gear carrier 142C by means of the support pin 146.

[0141] The switching component 150 is movable between a first position and a second position further forward than the first position. The switching component 150 is guided by the support pin 145 to move between the first position and the second position.

[0142] When the switching member 150 is positioned in the first position, it is connected to the first gear carrier 141C and the intermediate rotating shaft 143, respectively. Furthermore, when the switching member 150 is positioned in the first position, it is moved away from the connecting member 151. When the switching member 150 is positioned in the first position, the rear end of the first gear carrier 141C, the intermediate rotating shaft 143, and the switching member 150 become a single unit. When the first gear carrier 141C rotates while the switching member 150 is positioned in the first position, the first gear carrier 141C, the intermediate rotating shaft 143, and the switching member 150 rotate together.

[0143] When the switching member 150 is positioned in the second position, it is connected to the connecting member 151. Furthermore, when the switching member 150 is positioned in the second position, it is away from the first gear carrier 141C and the intermediate shaft 143. When the switching member 150 is positioned in the second position, the rear end of the intermediate shaft 143 is separated from the first gear carrier 141C. When the switching member 150 is positioned in the second position, the connecting member 151 and the switching member 150 become one unit. A support pin 145 is disposed in the hole 150H of the switching member 150. Additionally, the support pin 145 is connected to the planetary gear 141P. When the planetary gear 141P revolves in the second position, the connecting member 151 and the switching member 150 rotate together.

[0144] When the switching component 150 is configured in the first position, the switching component 150 and the intermediate rotating shaft 143 are connected by a spline connection. When the switching component 150 is configured in the second position, the spline connection is released, and the connection between the switching component 150 and the intermediate rotating shaft 143 is released.

[0145] With the switching component 150 configured in the first position, when the rotor shaft 82A rotates due to the drive of the motor 8, the pinion 141S rotates, and the planetary gear 141P revolves around the pinion 141S. With the switching component 150 configured in the first position, the first gear carrier 141C, the rear end of the intermediate shaft 143, and the switching component 150 are integrated. Through the revolution of the planetary gear 141P, the first gear carrier 141C, the intermediate shaft 143, and the switching component 150 rotate together at a speed lower than the rotational speed of the rotor shaft 82A. The rotation of the intermediate shaft 143 causes the sun gear 142S to rotate. When the sun gear 142S rotates, the planetary gear 142P revolves around the sun gear 142S. Through the revolution of the planetary gear 142P, the second gear carrier 142C and the output shaft 144 rotate at a speed lower than the rotational speed of the intermediate shaft 143. Thus, when the switching component 150 is configured in the first position, when the motor 8 is driven, the deceleration functions of the first planetary gear mechanism 141 and the second planetary gear mechanism 142 are simultaneously utilized, and the output shaft 144 rotates at the first speed.

[0146] With the switching member 150 in the second position, when the rotor shaft 82A rotates due to the drive of the motor 8, the pinion 141S rotates, and the planetary gear 141P revolves around the pinion 141S. Through the revolution of the planetary gear 141P, the first gear carrier 141C rotates together with it at a speed lower than the rotational speed of the rotor shaft 82A. With the switching member 150 in the second position, the switching member 150 is moved away from the first gear carrier 141C and the intermediate shaft 143. With the switching member 150 in the second position, the rear end of the intermediate shaft 143 is separated from the first gear carrier 141C. With the switching member 150 in the second position, the connecting member 151 and the switching member 150 are integrated. With the switching member 150 in the second position, the support pin 145 is disposed in the hole 150H of the switching member 150. The planetary gear 141P revolves around the earth, causing the connecting component 151 and the switching component 150 to rotate at the same speed as the first gear carrier 141C. The planetary gear 142P revolves around the earth at the same speed as the connecting component 151. The second gear carrier 142C and the output shaft 144 rotate at the same speed as the intermediate shaft 143. Thus, when the switching component 150 is in the second position, when the motor 8 is driven, although the first planetary gear mechanism 141 performs its speed reduction function, the second planetary gear mechanism 142 does not, and the output shaft 144 rotates at the second speed.

[0147] The rotary output section 5 rotates based on the rotational force transmitted from the motor 8 via the reduction gear 14. The rotary output section 5 protrudes downwards from the front of the gear housing 4. A drill bit is mounted on the rotary output section 5. The rotary output section 5 can rotate with the drill bit mounted. The rotation axis BX of the rotary output section 5 extends in the vertical direction. The rotation axis AX of the motor 8 and the rotation axis BX of the rotary output section 5 are orthogonal.

[0148] The rotary output unit 5 includes a spindle 51 and a drill chuck 52 mounted at the lower end of the spindle 51. The drill chuck 52 has an insertion hole 52A for inserting a drill bit. The insertion hole 52A is formed to extend upward from the lower end of the drill chuck 52. The drill chuck 52 is capable of rotating with a drill bit mounted on it.

[0149] The spindle 51 is rotatably supported by needle roller bearing 53 and ball bearing 54. Needle roller bearing 53 supports the upper part of spindle 51 so that it can rotate. Ball bearing 54 supports the lower part of spindle 51 so that it can rotate.

[0150] A bevel gear 55 is provided at the upper end of the main shaft 51. The bevel gear 55 meshes with the bevel gear 148 of the output shaft 144. The diameter of the bevel gear 55 is larger than the diameter of the bevel gear 148. The number of teeth of the bevel gear 55 is greater than the number of teeth of the bevel gear 148.

[0151] <Action>

[0152] Next, an example of the operation of the electric excavator 1A according to this embodiment will be described. With the battery pack 17 installed in the battery assembly 7, power is supplied to the electric excavator 1A from the battery pack 17 when the main switch 10 is operated. While power is supplied to the electric excavator 1A from the battery pack 17, an operation signal is output from the switch circuit 11B when the trigger switch 11 is operated. The controller 13 supplies current to the motor 8 based on the operation signal output from the switch circuit 11B. By supplying current to the motor 8, the rotor shaft 82A rotates.

[0153] The rotation of the rotor shaft 82A drives the first planetary gear mechanism 141, the intermediate shaft 143, and the second planetary gear mechanism 142, respectively, causing the output shaft 144 to rotate. The bevel gear 148 of the output shaft 144 meshes with the bevel gear 55 of the main shaft 51. The rotation of the output shaft 144 causes the main shaft 51 to rotate. The rotation of the main shaft 51 causes the drill chuck 52 to rotate. The rotation of the drill chuck 52 causes the drill bit mounted on it to rotate.

[0154] The rotation of rotor shaft 82A causes centrifugal fan 85 to rotate. The rotation of centrifugal fan 85 causes air to circulate around motor 8. The air circulation around motor 8 cools motor 8. The air circulating around motor 8 is discharged from exhaust port 2E.

[0155] <Auxiliary Devices>

[0156] Figure 5 This is an exploded perspective view showing a portion of the accessory device 100 of this embodiment as viewed from the front. Figure 6 This is an exploded perspective view showing a portion of the accessory device 100 of this embodiment as viewed from the rear. Figure 7 This is a perspective view showing a portion of the accessory device 100 of this embodiment as viewed from the front. Figure 8 This is a perspective view showing a portion of the accessory device 100 of this embodiment as viewed from the rear.

[0157] The auxiliary device 100 is mounted on the electric excavator 1A. In this embodiment, the auxiliary device 100 is mounted on the gear housing 4 of the electric excavator 1A. The auxiliary device 100 can be attached to and detached from the gear housing 4 of the electric excavator 1A.

[0158] The auxiliary device 100 includes an auxiliary handle 20 that is detachable from the gear housing 4. The auxiliary handle 20 receives the reaction force transmitted from the rotary output unit 5 to the gear housing 4. The auxiliary handle 20 includes a handle joint 21, a handle 22, and a reaction force receiving component 23.

[0159] The handle connector 21 is fixed to the gear housing 4. The handle connector 21 includes a left handle connector 21L fixed to the left side of the gear housing 4 and a right handle connector 21R fixed to the right side of the gear housing 4.

[0160] The handle 22 is fixed to the handle connector 21. The handle 22 is configured to extend forward from the handle connector 21. The handle 22 includes: a left rod portion 22L extending forward from the left handle connector 21L; a right rod portion 22R extending forward from the right handle connector 21R; and a connecting rod portion 22C connecting the front ends of the left rod portion 22L and the front ends of the right rod portion 22R.

[0161] The handle 22 is manufactured by bending a single tube. Alternatively, the handle 22 can be manufactured by welding multiple tubes together. The handle 22 is made of a metal such as aluminum. In this embodiment, the front ends of the left rod portion 22L, the right rod portion 22R, and the connecting rod portion 22C are each covered by a cover 22E. The cover 22E is made of synthetic resin or rubber.

[0162] The reaction force receiving component 23 is fixed to the handle joint 21. The reaction force receiving component 23 is configured to be located further outward (left side) than the handle joint 21 in the left-right direction relative to the center of the auxiliary handle 20. The reaction force receiving component 23 includes: a fixed rod portion 23A that extends in the front-rear direction; and a protruding rod portion 23B that protrudes outward (left side) from the front end of the fixed rod portion 23A in the left-right direction relative to the center of the auxiliary handle 20.

[0163] The reaction force receiving component 23 is manufactured by bending a single tube. Alternatively, the reaction force receiving component 23 can be manufactured by welding multiple tubes together. The reaction force receiving component 23 is made of a metal such as aluminum. In this embodiment, at least a portion of the fixed rod portion 23A is covered by a cover 23C. The cover 23C is made of synthetic resin or rubber. At least a portion of the protruding rod portion 23B is covered by a cover 23D. The cover 23D is made of synthetic resin or rubber.

[0164] The handle connector 21 has: a main body 21A, a screw boss 21B, and a screw boss 21C.

[0165] The main body 21A has an inner side facing the center of the auxiliary handle 20 in the left-right direction, and an outer side facing the opposite side of the inner side. The inner side of the main body 21A is opposite to the gear housing 4.

[0166] The screw boss 21B is configured to protrude outward from the outer side of the main body 21A in the left-right direction relative to the center of the auxiliary handle 20.

[0167] The screw boss 21C is connected to the rear and lower part of the main body 21A.

[0168] The main body 21A has: a handle hole 24, an inner recess 25, an outer recess 26, a screw hole 27, and a screw opening 28. The screw boss 21B has a screw opening 29. The screw boss 21C has a screw opening 30.

[0169] The handle hole 24 is formed such that it extends rearward from the front end of the main body 21A. The rear end of the left rod 22L is inserted into the handle hole 24 of the left handle connector 21L. The rear end of the right rod 22R is inserted into the handle hole 24 of the right handle connector 21R.

[0170] The inner recess 25 is configured such that a portion of the upper surface of the main body 21A and a portion of the inner side surface of the main body 21A are cut off. At least a portion of the front grip 6 is disposed in the inner recess 25. A left arm portion 6L is disposed in the inner recess 25 of the left handle joint 21L. A right arm portion 6R is disposed in the inner recess 25 of the right handle joint 21R.

[0171] An outer recess 26 is provided on the outer surface of the main body 21A. The outer recess 26 is configured to extend from the outer surface of the main body 21A toward the center of the auxiliary handle 20 in the left-right direction. A portion of the fixing rod 23A is disposed in the outer recess 26.

[0172] When the virtual axis extending in the front-rear direction is set as the front-rear axis, in a plane orthogonal to the front-rear axis, the inner surface of the outer recess 26 is an arc-shaped depression that tends towards the center in the left-right direction of the auxiliary handle 20. In a plane orthogonal to the front-rear axis, the outer surface of the fixing rod portion 23A, which is opposite to the inner surface of the outer recess 26, is an arc-shaped bulge that tends towards the center in the left-right direction of the auxiliary handle 20. The inner surface of the outer recess 26 and the outer surface of the fixing rod portion 23A are in contact.

[0173] A screw hole 27 is provided in the outer recess 26. Two screw holes 27 are spaced apart along the front-to-back direction in the outer recess 26. Screw openings 23E are provided in the fixing rod portion 23A and the cover 23C. Five screw openings 23E are spaced apart along the front-to-back direction. With the fixing rod portion 23A positioned in the outer recess 26, a screw 31 is inserted into the screw hole 27 via the screw opening 23E. Accordingly, the handle connector 21 and the reaction force receiving component 23 are secured by the screw 31.

[0174] Two screws 31 are arranged along the front-rear direction. By selecting the screw opening 23E for inserting the screws 31, the position of the reaction force receiving component 23 in the front-rear direction can be adjusted.

[0175] The reaction force receiving component 23 is fixed to one of the handle joints 21 of the left handle joint 21L and the right handle joint 21R. With the left handle joint 21L and the reaction force receiving component 23 fixed, and the fixing rod portion 23A positioned in the outer recess 26 of the left handle joint 21L, the fixing rod portion 23A and the left handle joint 21L are fixed together by means of a screw 31. Similarly, with the right handle joint 21R and the reaction force receiving component 23 fixed, and the fixing rod portion 23A positioned in the outer recess 26 of the right handle joint 21R, the fixing rod portion 23A and the right handle joint 21R are fixed together by means of a screw 31.

[0176] Figure 5 and Figure 6 The handle connector 21 and the reaction force receiving component 23 are shown in a separated state. Figure 7 and Figure 8 The left handle connector 21L and the reaction force receiving component 23 are shown to be fixed by means of screws 31.

[0177] Two screw openings 29 are provided at intervals along the front-to-back direction at the screw boss portion 21B. The screw openings 29 are formed to connect with the inner surface of the handle hole 24. Screws 32, which secure the handle connector 21 and the handle 22, are inserted into the screw openings 29. Two screws 32 are arranged along the front-to-back direction. The screws 32 inserted into the screw openings 29 are inserted into screw holes provided in at least a portion of the handle 22. The handle connector 21 and the handle 22 are secured by the screws 32. The screws 32 inserted into the screw openings 29 of the left handle connector 21L are inserted into screw holes provided in the left rod portion 22L, thereby securing the left handle connector 21L and the left rod portion 22L. The screws 32 inserted into the screw openings 29 of the right handle connector 21R are inserted into screw holes provided in the right rod portion 22R, thereby securing the right handle connector 21R and the right rod portion 22R.

[0178] Figure 9 This is a perspective view showing an electric excavator 1A equipped with a portion of the accessory device 100 of this embodiment, viewed from the front. Figure 10 This is a perspective view showing an electric excavator 1A equipped with a portion of the accessory device 100 of this embodiment, viewed from the rear. Figure 11 This is a perspective view showing an electric excavator 1A equipped with a portion of the accessory device 100 of this embodiment, viewed from the front.

[0179] Figure 12 This is a perspective view showing an electric excavator 1A equipped with a portion of the accessory device 100 of this embodiment, viewed from the rear. Figure 9 and Figure 10 The following are shown: the auxiliary handle 20 is mounted on the electric excavator 1A with the handle 22 fixed to the handle joint 21 but the reaction force receiving component 23 not fixed. Figure 11 and Figure 12 The diagram shows the state in which the auxiliary handle 20 is mounted on the electric excavator 1A with the handle 22 and the reaction force receiving component 23 fixed to the handle joint 21.

[0180] A screw opening 28 is located on the rear side of the screw boss portion 21B within the main body portion 21A. A screw 33, which clamps the front grip 6 and secures the handle connector 21 and gear housing 4, is inserted into the screw opening 28. The screw 33 inserted into the screw opening 28 is referenced... Figures 1 to 3The screw opening 6C of the front grip 6 is inserted into the screw hole 16 of the gear housing 4. The handle joint 21 and the gear housing 4 clamp the front grip 6 and are secured by screws 33. The screw 33, inserted into the screw opening 28 of the left handle joint 21L, is inserted into the screw hole 16 on the left side of the gear housing 4 via the screw opening 6C of the left arm portion 6L, thereby securing the left handle joint 21L and the left side of the gear housing 4. The screw 33, inserted into the screw opening 28 of the right handle joint 21R, is inserted into the screw hole 16 on the right side of the gear housing 4 via the screw opening 6C of the right arm portion 6R, thereby securing the right handle joint 21R and the right side of the gear housing 4.

[0181] A screw opening 30 is provided at the screw boss 21C. A screw 34, which secures the handle connector 21 and the gear housing 4, is inserted into the screw opening 30. The screw 34 inserted into the screw opening 30 is then inserted into a reference... Figure 3 The screw hole 18 of the gear housing 4 is described above. The handle connector 21 and the gear housing 4 are fixed by means of screws 34. The screw 34, which is inserted into the screw opening 30 of the left handle connector 21L, is inserted into the screw hole 18 on the left side of the gear housing 4, thereby fixing the left handle connector 21L and the left side of the gear housing 4. The screw 34, which is inserted into the screw opening 30 of the right handle connector 21R, is inserted into the screw hole 18 on the right side of the gear housing 4, thereby fixing the right handle connector 21R and the right side of the gear housing 4.

[0182] <Assist stick>

[0183] Figure 13 This is a perspective view of an electric excavator 1A equipped with the accessory device 100 of this embodiment, viewed from the front. Figure 14 This is a perspective view showing an electric excavator 1A equipped with the accessory device 100 of this embodiment, viewed from the rear. Figure 15 This is a left view of an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 16 This is a right view of an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 17 This is a top view of an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 18 This is a bottom view of an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 19 This is a rear view of an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 20 This is a front view of an electric excavator 1A equipped with the accessory device 100 of this embodiment.

[0184] like Figures 13 to 20As shown, a drill bit 19 is mounted on the rotary output section 5. The drill bit 19 is a ground excavation drill bit, also known as a post hole drill bit. The drill bit 19 has: a digging spindle 19A, a digging cutting edge 19B, a front drill 19C, and a cutting drill 19D.

[0185] The excavation shaft 19A is configured along the vertical direction. When the drill bit 19 is mounted on the rotary output section 5, as... Figures 9 to 12 As shown, the adapter 5A is inserted into the insertion hole 52A of the drill chuck 52. The adapter 5A is a rod-shaped component. A hole for inserting the adapter 5A is provided at the upper end of the digging shaft 19A. With the adapter 5A inserted into the hole at the upper end of the digging shaft 19A, the upper end of the digging shaft 19A and the adapter 5A are fixed by means of the fixing member 5B. The upper end of the digging shaft 19A is mounted on the drill chuck 52 by means of the adapter 5A.

[0186] The digging blade 19B is spirally arranged around the digging shaft 19A. The digging blade 19B is fixed to the digging shaft 19A.

[0187] The front drill 19C is positioned at the lower end of the excavation shaft 19A.

[0188] The cutting drill 19D is positioned at the lower end of the digging blade 19B.

[0189] like Figure 11 and Figure 12 As shown, the accessory device 100 includes an auxiliary handle 20 that is detachable from the gear housing 4. The auxiliary handle 20 includes a left handle joint 21L, a right handle joint 21R, a handle 22, and a reaction force receiving component 23.

[0190] like Figures 13 to 20 As shown, the auxiliary device 100 also includes an auxiliary rod 40. The auxiliary rod 40 is arranged vertically adjacent to the drill bit 19.

[0191] Figure 21 This is an exploded perspective view showing the auxiliary rod 40 in this embodiment. Figures 13 to 21 As shown, the auxiliary rod 40 has: a tube 40A, a foot 40B, and a cap 40C.

[0192] The tube section 40A is formed from a straight metal tube. The tube section 40A is arranged vertically. The tube section 40A is arranged parallel to the excavation shaft 19A. Screw openings 40D are provided in the tube section 40A. Two screw openings 40D are spaced apart vertically.

[0193] Foot 40B is fitted to the lower end of tube 40A. Foot 40B is configured to seal the opening at the lower end of tube 40A. Foot 40B is made of rubber. Figure 21As shown, the foot 40B has: a plug portion 40E that is inserted into the opening at the lower end of the tube portion 40A; and a flange portion 40F that is connected to the lower end of the plug portion 40E. The outer diameter of the flange portion 40F is larger than the outer diameter of the tube portion 40A.

[0194] A cap 40C is fitted to the upper end of a tube 40A. The cap 40C is configured to seal the opening at the upper end of the tube 40A. At least a portion of the cap 40C is inserted into the opening at the upper end of the tube 40A. The cap 40C is made of rubber.

[0195] The lower end 40U of the auxiliary rod 40 is configured to be higher than the lower end 19U of the drill bit 19. A hole is formed in the ground by rotating the drill bit 19. The lower end 40U of the auxiliary rod 40 contacts the ground around the hole formed by the drill bit 19, thereby assisting the electric excavator 1A in its digging operation so that the depth of the hole is the target depth.

[0196] The accessory device 100 further includes a retaining member 41 that is detachable from at least a portion of the auxiliary handle 20. The auxiliary rod 40 is held in the retaining member 41. The retaining member 41 is fixed to the handle joint 21. The auxiliary rod 40 is supported on the handle joint 21 by means of the retaining member 41.

[0197] The retaining component 41 is fixed to one of the handle connectors 21 of the left handle connector 21L and the right handle connector 21R. Figures 13 to 20 In the example shown, a reaction force receiving component 23 is fixed to the left handle joint 21L. A retaining component 41 is fixed to the right handle joint 21R. The auxiliary rod 40 is supported on the right handle joint 21R by means of the retaining component 41.

[0198] The retaining member 41 extends in the front-to-back direction. A portion of the retaining member 41 is disposed in the outer recess 26 of the right handle joint 21R.

[0199] As described above, in a plane orthogonal to the front and rear axes, the inner surface of the outer recess 26 is an arc-shaped depression that tends towards the center in the left-right direction of the auxiliary handle 20. In a plane orthogonal to the front and rear axes, the outer surface of the retaining member 41, which is opposite to the inner surface of the outer recess 26, is an arc-shaped bulge that tends towards the center in the left-right direction of the auxiliary handle 20. The inner surface of the outer recess 26 and the outer surface of the retaining member 41 are in contact.

[0200] As described above, the right handle connector 21R has a screw hole 27 provided in the outer recess 26. Two screw holes 27 are spaced apart in the outer recess 26 along the front-rear direction. The retaining member 41 has a plurality of screw openings 42 spaced apart in the front-rear direction. Six screw openings 42 are spaced apart in the front-rear direction. With the retaining member 41 positioned in the outer recess 26, a screw 35 is inserted into the screw hole 27 via the screw openings 42. Accordingly, the right handle connector 21R and the retaining member 41 are secured by the screw 35.

[0201] Two screws 35 are arranged along the front-to-back direction. By selecting the screw opening 42 for inserting the screws 35, the position of the retaining member 41 and the auxiliary rod 40 held in the retaining member 41 in the front-to-back direction can be adjusted.

[0202] Figure 22 This is a perspective view showing the auxiliary rod 40 and the retaining member 41 of this embodiment. The retaining member 41 includes a retaining mechanism 43 that retains the auxiliary rod 40 in a detachable manner.

[0203] The retaining mechanism 43 has: a clamping part 44 disposed around at least a portion of the auxiliary rod 40; and a rod 46 connected to the clamping part 44 by means of a hinge 45.

[0204] The clamping part 44 can fix the auxiliary rod 40. The clamping part 44 is provided at the front end of the retaining member 41. The clamping part 44 has: an arcuate part 44A, a plate part 44B, and a plate part 44C. In this embodiment, the clamping part 44 is part of the retaining member 41. The arcuate part 44A is disposed around a portion of the tube part 40A. The plate part 44B is provided at one end of the arcuate part 44A. The plate part 44C is provided at the other end of the arcuate part 44A. The plate parts 44B and 44C are positioned opposite each other with a gap between them. The plate parts 44B and 44C are connected by screws 47.

[0205] The lever 46 is connected to the clamping part 44 by means of a hinge 45. The lever 46 is rotatably supported on the clamping part 44 by means of the hinge 45. The lever 46 is operated by the operator to fix the auxiliary lever 40 using the clamping part 44. The lever 46 has a cam portion that contacts the plate portion 44B of the clamping part 44. Figure 22 Rotating the rod 46 in the tightening direction Ya, as indicated by the arrow, fastens the tube portion 40A of the auxiliary rod 40 to the clamping portion 44, thus fixing the auxiliary rod 40 to the clamping portion 44. That is, the auxiliary rod 40 is fixed to the front end of the retaining member 41. By moving along... Figure 22Rotating lever 46 in the relaxation direction Yb, as indicated by the arrow, releases the clamping part 44 from fixing the auxiliary lever 40. With the auxiliary lever 40 released from its fixation, the operator can move the auxiliary lever 40 vertically relative to the clamping part 44. The operator can adjust the vertical position of the auxiliary lever 40 relative to the holding member 41.

[0206] <How to Use>

[0207] Next, the method of using the electric excavator 1A according to this embodiment will be explained. Figure 23 This is a side view illustrating the method of using an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 24 This is a top view illustrating the method of using an electric excavator 1A equipped with the accessory device 100 of this embodiment. Figure 23 and Figure 24 As shown, when the electric excavator 1A is used to excavate the ground, a drill bit 19 is installed in the rotary output section 5 and an auxiliary device 100 is installed in the gear housing 4.

[0208] The operator holds the connecting rod portion 22C of the handle 22 with their left hand and the grip portion 3B of the handle housing 3 with their right hand. Additionally, the operator brings the extended rod portion 23B of the reaction force receiving component 23 into contact with the left side of their body. The operator brings the extended rod portion 23B into contact with at least one of the left side of their abdomen, left waist, or left thigh.

[0209] The operator uses the fingers of their right hand, which holds the handle 3B, to operate the trigger lever 11A. By operating the trigger lever 11A, the rotating output unit 5 is moved along the path of the drill bit 19, with the drill bit mounted on it. Figure 24 Rotate in the specified direction Ra indicated by the arrow.

[0210] The operator presses the auxiliary handle 20 and the electric excavator 1A downwards, pressing the rotating drill bit 19 into the ground. The rotating drill bit 19 pressing into the ground excavates the ground, creating a hole. The operator can press the handle 22 downwards with their left hand or the grip 3B downwards with their right hand. Additionally, the operator can press the front grip 6 downwards with their stomach. By pressing the front grip 6 downwards, the gear housing 4 is pressed downwards.

[0211] During ground excavation, there may be a large reaction force Vr in the direction of... Figure 23 The arrow points upwards and acts on the gear housing 4 via the drill bit 19 and the rotating output section 5. Additionally, a large reaction force Hr may exist, tending towards... Figure 24 The arrow indicates the opposite direction of Ra, which acts on the gear housing 4 via the drill bit 19 and the rotating output part 5.

[0212] Furthermore, during ground excavation, when the drill bit 19 encounters a hard object such as rock, an excessive reaction force may act rapidly on the gear housing 4. If a large reaction force acts on the gear housing 4, the electric excavator 1A may become unstable, or the operator holding the electric excavator 1A may be shaken. As a result, it may be difficult to form the target hole in the ground.

[0213] In this embodiment, an auxiliary handle 20 for receiving the reaction force transmitted from the rotary output unit 5 to the gear housing 4 is mounted on the electric excavator 1A. The auxiliary handle 20 includes a handle 22 for receiving the reaction force transmitted from the rotary output unit 5 to the gear housing 4 and a reaction force receiving component 23.

[0214] The connecting rod 22C is held by the operator's left hand, thereby receiving the reaction force Vr in the vertical direction parallel to the rotation axis BX of the rotary output section 5 and the reaction force Hr in the rotation direction of the rotary output section 5.

[0215] The handle 3B is held by the operator's right hand, thereby receiving the reaction force Vr in the vertical direction parallel to the rotation axis BX of the rotary output section 5 and the reaction force Hr in the rotation direction of the rotary output section 5.

[0216] The extended rod 23B comes into contact with the operator's body, thereby receiving the reaction force Hr in the rotational direction of the rotating output section 5.

[0217] The connecting rod portion 22C is positioned at the front of the gear housing 4. The handle portion 3B is positioned at the rear of the gear housing 4. The extending rod portion 23B is positioned at the side of the gear housing 4. The connecting rod portion 22C, held by the operator's left hand, is positioned away from the rotary output portion 5. The handle portion 3B, held by the operator's right hand, is positioned away from the rotary output portion 5. The extending rod portion 23B, which is in contact with the operator's body, is positioned away from the rotary output portion 5.

[0218] like Figure 23 As shown, the upward reaction force Vr transmitted to the gear housing 4 is dispersed to the connecting rod portion 22C, the handle portion 3B, and the front handle 6, respectively. Because the reaction force Vr transmitted to the gear housing 4 is dispersed to the connecting rod portion 22C, the handle portion 3B, and the front handle 6, the dispersed reaction force Vr is transmitted to the operator. Therefore, even if a large reaction force Vr acts on the gear housing 4, instability in the posture of the electric excavator 1A or swaying of the operator holding the electric excavator 1A can be suppressed.

[0219] In addition, such as Figure 24As shown, the reaction force Hr transmitted to the gear housing 4 in the rotational direction is dispersed to the connecting rod portion 22C, the handle portion 3B, and the extension rod portion 23B, respectively. Because the reaction force Hr transmitted to the gear housing 4 is dispersed to the connecting rod portion 22C, the handle portion 3B, and the extension rod portion 23B, the dispersed reaction force Hr is transmitted to the operator. Therefore, even if a large reaction force Vr acts on the gear housing 4, instability in the posture of the electric excavator 1A or swaying of the operator holding the electric excavator 1A can be suppressed.

[0220] In this embodiment, the auxiliary device 100 includes an auxiliary rod 40 arranged vertically adjacent to the drill bit 19. The lower end 40U of the auxiliary rod 40 is positioned higher than the lower end 19U of the drill bit 19. The vertical distance ΔD between the lower end of the digging edge 19B and the lower end 19U of the drill bit 19 is determined by the target depth of the hole formed in the ground. The operator performs digging operations with the electric excavator 1A until the lower end 40U of the auxiliary rod 40 contacts the ground around the hole formed by the drill bit 19. By performing digging operations with the electric excavator 1A until the lower end 40U of the auxiliary rod 40 contacts the ground around the hole formed by the drill bit 19, a hole of the target depth is formed in the ground.

[0221] When the excavation work is completed, the operator can lift the electric excavator 1A upwards by holding at least one of the handle 22, the reaction force receiving part 23, the grip part 3B, and the front grip 6. By lifting the electric excavator 1A upwards, the drill bit 19 can be pulled out of the hole formed in the ground.

[0222] <Effect>

[0223] As explained above, in this embodiment, the auxiliary device 100 is mounted on an electric excavator 1A. The electric excavator 1A includes: a motor housing 2 that houses a motor 8; a handle housing 3 located at the rear of the motor housing 2 and having a grip portion 3B with a trigger switch 11 for starting the motor 8; a gear housing 4 located at the front of the motor housing 2 for housing a gear; and a rotary output portion 5 protruding downwards from the gear housing 4 and on which a drill bit 19 is mounted. The auxiliary device 100 includes an auxiliary rod 40 arranged vertically adjacent to the drill bit 19.

[0224] In the above configuration, the auxiliary rod 40 assists in the excavation operation to form a target hole in the ground. The drill bit 19 rotates to form a hole in the ground. The auxiliary rod 40 contacts the ground surrounding the hole formed by the drill bit 19, thereby forming the target hole in the ground.

[0225] In this embodiment, the lower end 40U of the auxiliary rod 40 is configured to be positioned higher than the lower end 19U of the drill bit 19.

[0226] In the above configuration, the lower end 40U of the auxiliary rod 40 is positioned higher than the lower end 19U of the drill bit 19, thereby forming a hole at the target depth in the ground. The vertical distance ΔD between the lower end of the digging blade 19B and the lower end 19U of the drill bit 19 is determined by the target depth of the hole. By performing digging operations until the lower end 40U of the auxiliary rod 40 contacts the ground around the hole formed by the drill bit 19, a hole at the target depth is formed in the ground.

[0227] In this embodiment, the auxiliary device 100 includes: an auxiliary handle 20, which is detachable from the gear housing 4; and a retaining member 41, which is detachable from at least a portion of the auxiliary handle 20. The auxiliary rod 40 is held in the retaining member 41.

[0228] In the above configuration, the auxiliary handle 20 is held by the operator's hand, thereby enabling smooth excavation operations. The auxiliary rod 40 is supported by the auxiliary handle 20 by means of the retaining member 41, so that the operator can hold the auxiliary handle 20 to create a hole at the target depth in the ground.

[0229] In this embodiment, the retaining member 41 has a retaining mechanism 43 that retains the auxiliary rod 40 in a detachable manner. The retaining mechanism 43 includes: a clamping portion 44 disposed around at least a portion of the auxiliary rod 40; and a rod 46 connected to the clamping portion 44 by means of a hinge 45. By rotating the rod 46 along the fastening direction Ya, the auxiliary rod 40 is fixed to the clamping portion 44. By rotating the rod 46 along the relaxation direction Yb, the clamping portion 44 releases the fixation of the auxiliary rod 40.

[0230] In the above configuration, the position of the auxiliary rod 40 relative to the holding member 41 in the vertical direction can be fixed by rotating the rod 46 along the fastening direction Ya. The position of the auxiliary rod 40 relative to the holding member 41 in the vertical direction can be adjusted by rotating the rod 46 along the slack direction Yb.

[0231] In this embodiment, the auxiliary handle 20 includes a handle connector 21 fixed to the gear housing 4 and a handle 22 fixed to the handle connector 21. The retaining member 41 is fixed to the handle connector 21.

[0232] In the above configuration, the retaining component 41 is fixed to the gear housing 4 by means of the handle joint 21. The operator can hold the handle 22 by hand.

[0233] In this embodiment, the handle connector 21 includes a left handle connector 21L fixed to the left side of the gear housing 4 and a right handle connector 21R fixed to the right side of the gear housing 4. A retaining member 41 is fixed to the right handle connector 21R, and a reaction force receiving member 23 is fixed to the left handle connector 21L.

[0234] In the above configuration, the operator can receive the reaction force transmitted from the rotary output unit 5 to the gear housing 4 via the reaction force receiving component 23. This suppresses instability in the posture of the electric excavator 1A or swaying of the operator holding the electric excavator 1A. Consequently, a target hole is formed in the ground. Furthermore, since interference between the auxiliary rod 40 and the reaction force receiving component 23 is suppressed, digging operations can be carried out smoothly.

[0235] In addition, in this embodiment, a reaction force receiving component 23 can be fixed to the right handle joint 21R, and a retaining component 41 can be fixed to the left handle joint 21L.

[0236] In this embodiment, the handle connector 21 has a screw hole 27. The retaining member 41 has a plurality of screw openings 42 spaced apart along the front-rear direction. The handle connector 21 and the retaining member 41 are fixed by inserting screws 35 into the screw holes 27 through the screw openings 42. By selecting the screw openings 42 for screw 35 insertion, the position of the auxiliary rod 40 in the front-rear direction can be adjusted.

[0237] In the above configuration, the position of the auxiliary rod 40 in the front-to-back direction can be easily adjusted. The distance between the drill bit 19 and the auxiliary rod 40 in the front-to-back direction can be appropriately adjusted according to the conditions of the work site.

[0238] In addition, in this embodiment, the handle 22 arranged on the left-hand side (front side) of the motor housing 2 can be regarded as the first grip part held by the operator's left hand, and the grip part 3B arranged on the right-hand side (rear side) of the motor housing 2 can be regarded as the second grip part.

[0239] In the above configuration, the operator can smoothly carry out digging operations by holding the first grip part arranged on the front side of the rotary output section 5 and the second grip part arranged on the rear side of the rotary output section 5 respectively.

[0240] In this embodiment, the auxiliary rod 40 is mounted to the gear housing 4 by means of the retaining member 41. The auxiliary rod 40 can be mounted to the motor housing 2 or the handle housing 3. By mounting the auxiliary rod 40 to a suitable location on the electric excavator 1A, the situation where the auxiliary rod 40 obstructs the excavation operation is suppressed.

[0241] [Second Implementation]

[0242] The second embodiment will be described. In the following description, the same or equivalent components as those in the above embodiment will be marked with the same symbols, and the description of these components will be simplified or omitted.

[0243] Figure 25 This is a perspective view showing an electric excavator 1A equipped with the accessory device 101 of this embodiment, viewed from the front. Figure 26 This is a perspective view showing an electric excavator 1A equipped with the accessory device 101 of this embodiment, viewed from the rear. Figure 27 This is a left view of an electric excavator 1A equipped with the accessory device 101 of this embodiment. Figure 28 This is a right view of an electric excavator 1A equipped with the accessory device 101 of this embodiment. Figure 29 This is a top view of an electric excavator 1A equipped with the accessory device 101 of this embodiment. Figure 30 This is a bottom view of an electric excavator 1A equipped with the accessory device 101 of this embodiment. Figure 31 This is a rear view of an electric excavator 1A equipped with the accessory device 101 of this embodiment. Figure 32 This is a front view of an electric excavator 1A equipped with the accessory device 101 of this embodiment.

[0244] Similar to the above embodiment, the auxiliary device 101 includes an auxiliary handle 20. The auxiliary handle 20 includes a handle connector 21, a handle 22, and a reaction force receiving member 23. The handle connector 21 includes a left handle connector 21L and a right handle connector 21R.

[0245] Similar to the embodiment described above, the auxiliary device 101 includes an auxiliary rod 40. The auxiliary rod 40 is positioned vertically adjacent to the drill bit 19. The reaction force receiving member 23 is fixed to the left handle joint 21L. In this embodiment, a retaining member 41 is not fixed to the right handle joint 21R.

[0246] The accessory device 101 includes a retaining member 60 that is detachable from at least a portion of the auxiliary handle 20. The auxiliary rod 40 is held in the retaining member 60. In this embodiment, the retaining member 60 is fixed to the handle 22. The retaining member 60 extends in the left-right direction. The auxiliary rod 40 is supported on the handle 22 by means of the retaining member 60.

[0247] Figure 33 This is a perspective view showing the auxiliary rod 40 and the retaining member 60 of this embodiment. Figure 34 This is a cross-sectional view showing the auxiliary rod 40 and the retaining member 60 in this embodiment, equivalent to... Figure 33 Arrow view of the AA line section.

[0248] The retaining member 60 includes a first retaining member 61 and a second retaining member 62 configured to be positioned further below the first retaining member 61. The first retaining member 61 is a plate-like member that is longer in the left-right direction. The second retaining member 62 is also a plate-like member that is longer in the left-right direction. The first retaining member 61 has an upper surface 61A and a lower surface 61B. The second retaining member 62 has an upper surface 62A and a lower surface 62B. The lower surface 61B of the first retaining member 61 and the upper surface 62A of the second retaining member 62 are opposite each other. The first retaining member 61 and the second retaining member 62 are configured to clamp the handle 22 in the vertical direction.

[0249] The retaining member 60 is fixed to the left rod portion 22L and the right rod portion 22R. The first retaining member 61 and the second retaining member 62 are configured to clamp the left rod portion 22L and the right rod portion 22R from the vertical direction, respectively.

[0250] A recess 61L and a recess 61R are provided on the lower surface 61B of the first retaining member 61. The recesses 61L and 61R are respectively configured to be recessed upwards from the lower surface 61B. The recesses 61L and 61R are spaced apart in the left-right direction. The recess 61R is positioned further to the right than the recess 61L. A portion of the left rod portion 22L is disposed in the recess 61L. A portion of the right rod portion 22R is disposed in the recess 61R.

[0251] A recess 62L and a recess 62R are provided on the upper surface 62A of the second retaining member 62. The recesses 62L and 62R are respectively configured to be recessed downwards from the upper surface 62A. The recesses 62L and 62R are spaced apart in the left-right direction. The recess 62R is positioned further to the right than the recess 62L. A portion of the left rod portion 22L is disposed in the recess 62L. A portion of the right rod portion 22R is disposed in the recess 62R.

[0252] With the virtual axis extending in the front-back direction as the front-back axis, in a plane orthogonal to the front-back axis, the inner surfaces of the recess 61L and the recess 61R are respectively: arc-shaped depressions extending upwards from the lower surface 61B. In a plane orthogonal to the front-back axis, the outer surfaces of the left rod portion 22L, opposite the inner surface of the recess 61L, and the outer surfaces of the right rod portion 22R, opposite the inner surface of the recess 61R, are respectively: arc-shaped depressions extending upwards. The inner surface of the recess 61L and the outer surface of the left rod portion 22L are in contact. The inner surface of the recess 61R and the outer surface of the right rod portion 22R are in contact.

[0253] In a plane orthogonal to the front and rear axes, the inner surfaces of the recesses 62L and 62R are respectively arc-shaped, concave downwards from the upper surface 62A. In a plane orthogonal to the front and rear axes, the outer surfaces of the left rod portion 22L, opposite the inner surface of the recess 62L, and the right rod portion 22R, opposite the inner surface of the recess 62R, are respectively arc-shaped, bulging downwards. The inner surface of the recess 62L and the outer surface of the left rod portion 22L are in contact. The inner surface of the recess 62R and the outer surface of the right rod portion 22R are in contact.

[0254] The first retaining member 61 has a screw opening 63. The second retaining member 62 has a screw hole 64. A screw 65 is inserted into the screw hole 64 through the screw opening 63, so that the handle 22 is clamped by the first retaining member 61 and the second retaining member 62, and the first retaining member 61 and the second retaining member 62 fix the handle 22.

[0255] The first retaining member 61 has a retaining hole 61H for arranging the tube portion 40A of the auxiliary rod 40. The second retaining member 62 has a retaining hole 62H for arranging the tube portion 40A of the auxiliary rod 40. The retaining hole 61H is positioned further to the right than the recess 61R. The retaining hole 62H is positioned further to the right than the recess 62R.

[0256] In this embodiment, five screw openings 63 and five screw holes 64 are spaced apart along the left-right direction. Five screws 65 are also arranged along the left-right direction. The screws 65 include: screw 65A, screw 65B, screw 65C, screw 65D, and screw 65E. In the left-right direction, screws 65A and 65B are located on both sides of the left rod portion 22L. In the left-right direction, screws 65C and 65D are located on both sides of the right rod portion 22R. In the left-right direction, screws 65D and 65E are located on both sides of the tube portion 40A.

[0257] The fixation of the handle 22 by the first retaining member 61 and the second retaining member 62, which are secured by screws 65, is released, allowing adjustment of the position of the retaining member 60 in the front-back direction and the position of the auxiliary rod 40 held by the retaining member 60.

[0258] The retaining component 60 has a retaining mechanism 73 that can retain the auxiliary rod 40 in a detachable manner.

[0259] The retaining mechanism 73 has: a clamping part 74 disposed around at least a portion of the auxiliary rod 40; and a rod 76 connected to the clamping part 74 by means of a hinge 75.

[0260] The clamping part 74 can fix the auxiliary rod 40. The clamping part 74 is provided at the lower part of the right end of the second retaining member 62. The clamping part 74 has: an arcuate part 74A, a plate part 74B, and a plate part 74C. In this embodiment, the clamping part 74 is a part of the second retaining member 62. The arcuate part 74A is disposed around a portion of the tube part 40A. The plate part 74B is provided at one end of the arcuate part 74A. The plate part 74C is provided at the other end of the arcuate part 74A. The plate parts 74B and 74C are positioned opposite each other with a gap between them. The plate parts 74B and 74C are connected by screws 77.

[0261] The lever 76 is connected to the clamping part 74 via a hinge 75. The lever 76 is rotatably supported on the clamping part 74 via the hinge 75. The lever 76 is operated by the operator to fix the auxiliary lever 40 using the clamping part 74. The lever 76 has a cam portion that contacts the plate portion 74C of the clamping part 74. By following along... Figure 33 Rotating the rod 76 in the tightening direction Yc, as indicated by the arrow, causes the tube portion 40A of the auxiliary rod 40 to be fastened to the clamping portion 74, thus fixing the auxiliary rod 40 to the clamping portion 74. That is, the auxiliary rod 40 is fixed to the right end of the second retaining member 62. By moving along... Figure 33 Rotating lever 76 in the relaxation direction Yd, as indicated by the arrow, releases the fixation of auxiliary lever 40. With the auxiliary lever 40 released, the operator can move it vertically relative to clamping part 74. The operator can adjust the vertical position of auxiliary lever 40 relative to holding part 60.

[0262] In this embodiment, in the left-right direction, an auxiliary rod 40 is arranged on the outer side (right side) of the auxiliary handle 20 relative to the center of the auxiliary handle 20, and a reaction force receiving component 23 is fixed on the left handle joint 21L.

[0263] Figure 35 This is a perspective view showing the accessory device 101 and the electric excavator 1A of this embodiment as viewed from the front. Figure 36 This is a right view showing the accessory device 101 and the electric excavator 1A of this embodiment.

[0264] As described above, in this embodiment, there is no retaining member 41 fixed to the right handle joint 21R. In this embodiment, without using the auxiliary rod 40, the auxiliary rod 40 is fixed to the right handle joint 21R.

[0265] like Figure 35 and Figure 36As shown, the tube portion 40A of the auxiliary rod 40 is disposed in the outer recess 26 of the right handle connector 21R. The tube portion 40A disposed in the outer recess 26 of the right handle connector 21R is held by the right handle connector 21R and the cover 66. A screw opening 67 is provided in the cover 66. Two screw openings 67 are provided at intervals along the front-back direction. As described above, a screw hole 27 is provided in the outer recess 26, and a screw opening 40D is provided in the tube portion 40A. A screw 36, which is inserted into the screw opening 67 of the cover 66 and the screw opening 40D of the tube portion 40A, is inserted into the screw hole 27. Accordingly, the tube portion 40A is fixed to the right handle connector 21R by means of the screw 36 while being held by the cover 66 and the right handle connector 21R.

[0266] As explained above, in this embodiment, the auxiliary handle 20 includes a handle connector 21 fixed to the gear housing 4 and a handle 22 fixed to the handle connector 21. The retaining member 60 is fixed to the handle 22.

[0267] In the above configuration, the retaining component 60 is fixed to the gear housing 4 by means of the handle 22 and the handle connector 21.

[0268] In this embodiment, the retaining member 60 includes a first retaining member 61 and a second retaining member 62 configured to be positioned further below the first retaining member 61. The first retaining member 61 and the second retaining member 62 are configured to clamp the handle 22 from a vertical direction.

[0269] In the above configuration, the first retaining member 61 and the second retaining member 62 are configured to clamp the handle 22 from the vertical direction, so that the retaining member 60 and the handle 22 are stably fixed.

[0270] In this embodiment, the first retaining member 61 has a screw opening 63. The second retaining member 62 has a screw hole 64. A screw 65 is inserted into the screw hole 64 through the screw opening 63, thereby fixing the first retaining member 61, the second retaining member 62, and the handle 22.

[0271] In the above configuration, the first retaining member 61, the second retaining member 62, and the handle 22 are fixed by screws 65.

[0272] In addition, in this embodiment, the second retaining member 62 may have a screw opening 63, and the first retaining member 61 may have a screw hole 64.

[0273] In this embodiment, the handle 22 is configured to extend forward from the handle joint 21. The fixation of the handle 22 by the first retaining member 61 and the second retaining member 62, secured by screws 65, is released, allowing adjustment of the position of the auxiliary rod 40 in the forward-backward direction.

[0274] In the above configuration, the position of the auxiliary rod 40 in the front-to-back direction can be easily adjusted. The distance between the drill bit 19 and the auxiliary rod 40 in the front-to-back direction can be appropriately adjusted according to the conditions of the work site.

[0275] In this embodiment, the handle connector 21 includes a left handle connector 21L fixed to the left side of the gear housing 4 and a right handle connector 21R fixed to the right side of the gear housing 4. The handle 22 includes a left rod portion 22L extending forward from the left handle connector 21L, a right rod portion 22R extending forward from the right handle connector 21R, and a connecting rod portion 22C connecting the front ends of the left rod portion 22L and the right rod portion 22R. The retaining member 60 is fixed to the left rod portion 22L and the right rod portion 22R respectively. In the left-right direction, an auxiliary rod 40 is arranged at a position further outward (on the right side) than the right handle connector 21R, and a reaction force receiving member 23 is fixed to the left handle connector 21L.

[0276] In the above configuration, the retaining member 60 is fixed to the left rod portion 22L and the right rod portion 22R, thus ensuring the stability of the retaining member 60 and the handle 22. The operator can receive the reaction force transmitted from the rotary output portion 5 to the gear housing 4 by means of the reaction force receiving member 23. Accordingly, instability in the posture of the electric excavator 1A or swaying of the operator holding the electric excavator 1A is suppressed. Therefore, the target hole is formed in the ground. In addition, interference between the auxiliary rod 40 and the reaction force receiving member 23 is suppressed, so the digging operation can be carried out smoothly.

[0277] In addition, in this embodiment, an auxiliary rod 40 may be arranged in the left-right direction at a position further outward (left side) than the left handle joint 21L, and a reaction force receiving component 23 may be fixed to the right handle joint 21R.

[0278] Figure 37 This is a perspective view showing a modified example of the auxiliary rod 40 and the retaining member 60 of this embodiment as viewed from the front. Figures 25 to 34 In the example shown, in the left-right direction, the auxiliary lever 40 is positioned further outward than the lever 22 relative to the center of the auxiliary lever 20. For example... Figure 37 As shown, the auxiliary rod 40 can be positioned in the left-right direction between the left rod portion 22L and the right rod portion 22R.

[0279] [Third Implementation Method]

[0280] The third embodiment will be described. In the following description, the same or equivalent components as those in the above embodiments will be marked with the same symbols, and the description of these components will be simplified or omitted.

[0281] Figure 38This is a perspective view of an electric excavator 1A equipped with the accessory device 102 of this embodiment, viewed from the front. Figure 39 This is a perspective view of an electric excavator 1A equipped with the accessory device 102 of this embodiment, viewed from the rear. Figure 40 This is a left view of an electric excavator 1A equipped with the accessory device 102 of this embodiment. Figure 41 This is a right view of an electric excavator 1A equipped with the accessory device 102 of this embodiment. Figure 42 This is a top view of an electric excavator 1A equipped with the accessory device 102 of this embodiment. Figure 43 This is a bottom view of an electric excavator 1A equipped with the accessory device 102 of this embodiment. Figure 44 This is a rear view of an electric excavator 1A equipped with the accessory device 102 of this embodiment. Figure 45 This is a front view of an electric excavator 1A equipped with the accessory device 102 of this embodiment.

[0282] The auxiliary device 102 includes an auxiliary handle 20. In this embodiment, the auxiliary handle 20 is as described in reference to... Figure 9 and Figure 10 As described, it has a handle joint 21 and a handle 22, but does not have a reaction force receiving part 23. The handle joint 21 includes a left handle joint 21L and a right handle joint 21R.

[0283] Similar to the embodiment described above, the auxiliary device 102 includes an auxiliary rod 40. The auxiliary rod 40 is positioned vertically adjacent to the drill bit 19. The reaction force receiving member 23 is fixed to the left handle joint 21L. In this embodiment, a retaining member 41 is not fixed to the right handle joint 21R.

[0284] The auxiliary device 102 includes an auxiliary plate 90 disposed on the left side of the gear housing 4, which receives the reaction force transmitted from the rotary output section 5 to the gear housing 4. The auxiliary plate 90 is fixed to at least a portion of the auxiliary handle 20.

[0285] In this embodiment, the auxiliary plate 90 is fixed to the left handle connector 21L. The auxiliary plate 90 has screw openings 91. Two screw openings 91 are spaced apart along the front-to-back direction. As described above, the left handle connector 21L has screw holes 27 provided in the outer recess 26. The auxiliary plate 90 is fixed to the left handle connector 21L by means of screws 37, which are inserted into the screw openings 91 and then into the screw holes 27.

[0286] The auxiliary plate 90 has: an opening 92 for the screw boss portion 21B, a slit opening 93 located further forward than the opening 92, and an opening 94 located further rearward than the opening 92.

[0287] The auxiliary plate 90 and the left handle connector 21L are positioned by means of the screw boss 21B disposed in the opening 92. In this embodiment, the screw boss 21B and the opening 92 function as a positioning mechanism for positioning the auxiliary plate 90 and the left handle connector 21L.

[0288] Two slit openings 93 are arranged along the vertical direction. For example, a cable tie connected to the left rod 22L is inserted into the slit opening 93. The cable tie is used to fix the left rod 22L and the front of the auxiliary plate 90.

[0289] Opening 94 aligns screw 33.

[0290] With the auxiliary plate 90 fixed to the left handle connector 21L, the front end 90A of the auxiliary plate 90 is positioned further forward than the front end of the gear housing 4. Furthermore, the front end 90A of the auxiliary plate 90 is positioned further rearward than the front end of the handle 22, i.e., the front end of the connecting rod portion 22C (cover 22E). The upper end of the auxiliary plate 90 is positioned higher than the upper end of the handle 22 and the upper end of the left handle connector 21L. The lower end of the auxiliary plate 90 is positioned lower than the lower end of the handle 22.

[0291] Figure 46 This is a side view used to illustrate the method of using the electric excavator 1A according to this embodiment. Figure 47 This is a front view illustrating the method of using the electric excavator 1A according to this embodiment. In this embodiment, the object to be excavated by the electric excavator 1A is an earthen wall. The electric excavator 1A, equipped with the auxiliary device 102, is used to form a hole in the earthen wall laterally. When forming the hole, the electric excavator 1A is positioned such that the front end of the handle 22, i.e., the connecting rod portion 22C (cover 22E), contacts the ground.

[0292] The operator holds the front handle 6 with their left hand and the handle portion 3B of the handle housing 3 with their right hand. Additionally, the operator brings the auxiliary plate 90 into contact with their right leg. The operator performs the digging operation in a squatting position, ensuring that the auxiliary plate 90 is in contact with at least a portion of the inner thigh, the inner knee, and the inner lower leg of their right leg.

[0293] The operator uses the fingers of their right hand, which grips the handle 3B, to operate the trigger lever 11A. By operating the trigger lever 11A, the rotating output unit 5, with the drill bit 19 mounted, moves along... Figure 47 Rotate in the specified direction Ra indicated by the arrow.

[0294] The operator presses the electric excavator 1A forward, pressing the rotating drill bit 19 against the earthen wall. The rotating drill bit 19, pressed against the earthen wall, excavates the earthen wall, creating a hole.

[0295] During the excavation of the earthen wall, there may be a large reaction force Gr that tends to react with... Figure 47 The arrow indicates the opposite direction of Ra, which acts on the gear housing 4 via the drill bit 19 and the rotating output part 5.

[0296] Furthermore, during earthwork excavation, when drill bit 19 encounters a hard object such as rock, an excessive reaction force may act rapidly on gear housing 4. If a large reaction force acts on gear housing 4, the electric excavator 1A may become unstable, or the operator holding the electric excavator 1A may be shaken. As a result, it may be difficult to form the target hole in the earthwork.

[0297] In this embodiment, an auxiliary plate 90 for receiving the reaction force transmitted from the rotary output section 5 to the gear housing 4 is mounted on the electric excavator 1A by means of an auxiliary handle 20.

[0298] The auxiliary plate 90 is pressed down by the operator's right leg, thereby receiving the reaction force Gr in the rotational direction of the rotary output unit 5. Therefore, even if a large reaction force Gr acts on the gear housing 4, the instability of the electric excavator 1A's posture or the operator holding the electric excavator 1A being shaken can be suppressed.

[0299] When the excavation work is completed, the operator can move the electric excavator 1A forward by holding at least one of the handle 22, the grip 3B, and the front grip 6. By moving the electric excavator 1A forward, the drill bit 19 can be pulled out of the hole formed in the earthen wall.

[0300] As explained above, in this embodiment, the auxiliary device 102 includes an auxiliary plate 90, which is disposed on the left side of the gear housing 4 and receives the reaction force transmitted from the rotation output part 5 to the gear housing 4.

[0301] In the above configuration, the auxiliary plate 90 assists in the excavation operation to form a target hole in the earthen wall to be excavated. The operator can receive the reaction force Gr transmitted from the rotary output unit 5 to the gear housing 4 using the auxiliary plate 90. Accordingly, instability in the posture of the electric excavator 1A, or swaying of the operator holding the electric excavator 1A, is suppressed. Therefore, a target hole is formed in the earthen wall.

[0302] In this embodiment, the front end portion 90A of the auxiliary plate 90 is configured to be further forward than the front end portion of the gear housing 4.

[0303] In the above configuration, since the shape of the auxiliary plate 90 is larger than that of the gear housing 4, the operator can receive the reaction force Gr transmitted from the rotary output part 5 to the gear housing 4 with the help of the auxiliary plate 90.

[0304] In this embodiment, the auxiliary device 102 includes an auxiliary handle 20, which is detachable from the gear housing 4. An auxiliary plate 90 is fixed to at least a portion of the auxiliary handle 20. The auxiliary handle 20 has a handle connector 21 including a left handle connector 21L fixed to the left side of the gear housing 4 and a right handle connector 21R fixed to the right side of the gear housing 4, and a handle fixed to the handle connector 21. The auxiliary plate 90 is fixed to the left handle connector 21L.

[0305] In the above configuration, the auxiliary handle 20 is held by the operator's hand, thereby enabling smooth excavation operations. The auxiliary handle 20 assists in the excavation operation to form the target hole in the earthen wall. The auxiliary plate 90 is fixed to the left handle joint 21L, so the operator can receive the reaction force Gr transmitted from the rotary output part 5 to the gear housing 4 with the aid of the auxiliary handle 20 and the auxiliary plate 90.

[0306] In addition, in this embodiment, the auxiliary plate 90 can be fixed to the right handle connector 21R, or it can be fixed to both the left handle connector 21L and the right handle connector 21R at the same time.

[0307] In addition, in this embodiment, the handle 22 arranged on the left-hand side (front side) of the motor housing 2 can be regarded as the first grip part held by the operator's left hand, and the grip part 3B arranged on the right-hand side (rear side) of the motor housing 2 can be regarded as the second grip part.

[0308] In this embodiment, the auxiliary plate 90 is mounted on the gear housing 4 via the auxiliary handle 20. The auxiliary plate 90 can be mounted on the motor housing 2 or the handle housing 3. By mounting the auxiliary plate 90 at an appropriate location on the electric excavator 1A, the operator can receive the reaction force using the auxiliary plate 90.

[0309] [Fourth Implementation Method]

[0310] The fourth embodiment will be described. In the following description, the same or equivalent components as those in the above embodiments will be marked with the same symbols, and the description of these components will be simplified or omitted.

[0311] Figure 48 This is a perspective view showing the electric excavator 1B of this embodiment as viewed from the front. The electric excavator 1B includes: a motor housing 202, a first grip 203L, a second grip 203R, a trigger switch 211, a gear housing 204, a rotary output 205, and an auxiliary rod 240.

[0312] The motor housing 202 houses the motor. Additionally, the motor housing 202 houses the battery 217.

[0313] The first grip portion 203L is located on the left side of the motor housing 202. The second grip portion 203R is located on the right side of the motor housing 202. The trigger switch 211 is activated to start the motor. The trigger switch 211 is located on the second grip portion 203R.

[0314] The gear housing 204 is connected to the lower part of the motor housing 202. The gear housing 204 houses the gear.

[0315] The rotary output section 205 protrudes downward from the gear housing 204. A drill bit 219 is mounted on the rotary output section 205.

[0316] The auxiliary rod 240 is positioned adjacent to the drill bit 219 along the vertical direction. The auxiliary rod 240 performs the same function as the auxiliary rod 40 described in the first and second embodiments. The auxiliary rod 240 is positioned on the left or right side of the rotary output section 205, is movable in the vertical direction, and is fixed at a predetermined position in the vertical direction. The auxiliary rod 240 is mounted on at least one of the motor housing 202 and the gear housing 204. Alternatively, the auxiliary rod 240 can be held in a retaining member mounted on at least one of the motor housing 202 and the gear housing 204.

[0317] [Fifth Implementation Method]

[0318] The fifth embodiment will be described. In the following description, the same or equivalent components as those in the above embodiments will be marked with the same symbols, and the description of these components will be simplified or omitted.

[0319] Figure 49 This is a perspective view showing the electric excavator 1B of this embodiment as viewed from the front. Similar to the fourth embodiment described above, the electric excavator 1B includes: a motor housing 202, a first grip portion 203L, a second grip portion 203R, a trigger switch 211, a gear housing 204, and a rotary output portion 205.

[0320] In this embodiment, the electric excavator 1B includes an auxiliary plate 290. The auxiliary plate 290 performs the same function as the auxiliary plate 90 described in the third embodiment above. The auxiliary plate 290 is mounted on at least one of the motor housing 202 and the gear housing 204. The auxiliary plate 290 receives the reaction force generated by the rotation of the rotary output unit 205 with the operator's body.

Claims

1. An auxiliary device mounted on an electric excavator, This electric excavator features: Motor housing, which houses the motor; A handle housing disposed on the rear side of the motor housing and having a grip portion provided with a trigger switch for starting the motor; A gear housing, disposed on the front side of the motor housing, is used to house the gear; as well as A rotary output section, which protrudes downward from the gear housing, is used for mounting the drill bit. The auxiliary device is characterized in that have: An auxiliary rod is positioned adjacent to the drill bit and arranged vertically. An auxiliary handle, which is detachable from the gear housing; and A retaining component that is detachable from at least a portion of the auxiliary handle. The auxiliary rod is held in place by the retaining member. The retaining component includes a retaining mechanism that can retain the auxiliary rod in a detachable manner. The retaining mechanism includes: a clamping portion disposed around at least a portion of the auxiliary rod; and a rod connected to the clamping portion by means of a hinge. By rotating the rod in the fastening direction, the auxiliary rod is fixed to the clamping part; by rotating the rod in the slack direction, the clamping part is released from fixing the auxiliary rod.

2. The auxiliary device according to claim 1, characterized in that, The lower end of the auxiliary rod is configured to be positioned higher than the lower end of the drill bit.

3. An auxiliary device fitted onto an electric excavator, This electric excavator features: Motor housing, which houses the motor; A handle housing disposed on the rear side of the motor housing and having a grip portion provided with a trigger switch for starting the motor; A gear housing, disposed on the front side of the motor housing, is used to house the gear; as well as A rotary output section, which protrudes downward from the gear housing, is used for mounting the drill bit. The auxiliary device is characterized in that have: An auxiliary rod is positioned adjacent to the drill bit and arranged vertically. An auxiliary handle, which is detachable from the gear housing; and A retaining component that is detachable from at least a portion of the auxiliary handle. The auxiliary rod is held in place by the retaining member. The auxiliary handle includes: a handle connector fixed to the gear housing, and a handle fixed to the handle connector. The retaining component is fixed to the handle connector.

4. The auxiliary device according to claim 3, characterized in that, The handle connector includes: a left handle connector fixed to the left side of the gear housing, and a right handle connector fixed to the right side of the gear housing. The retaining component is fixed to one of the left and right handle joints, and the reaction force receiving component is fixed to the other handle joint.

5. The auxiliary device according to claim 4, characterized in that, The handle connector has a screw hole. The retaining component has a plurality of screw openings spaced apart along the front-to-back direction. The handle connector and the retaining member are secured by a screw inserted into the screw hole through the screw opening. By selecting the screw opening for screw insertion, the position of the auxiliary rod in the front-to-back direction can be adjusted.

6. An auxiliary device mounted on an electric excavator, This electric excavator features: Motor housing, which houses the motor; A handle housing disposed on the rear side of the motor housing and having a grip portion provided with a trigger switch for starting the motor; A gear housing, disposed on the front side of the motor housing, is used to house the gear; as well as A rotary output section, which protrudes downward from the gear housing, is used for mounting the drill bit. The auxiliary device is characterized in that have: An auxiliary rod is positioned adjacent to the drill bit and arranged vertically. An auxiliary handle, which is detachable from the gear housing; and A retaining component that is detachable from at least a portion of the auxiliary handle. The auxiliary rod is held in place by the retaining member. The auxiliary handle includes: a handle connector fixed to the gear housing, and a handle fixed to the handle connector. The retaining component is fixed to the handle.

7. The auxiliary device according to claim 6, characterized in that, The retaining component includes: a first retaining component and a second retaining component configured to be positioned lower than the first retaining component. The first retaining member and the second retaining member are configured to clamp the handle from the vertical direction.

8. The auxiliary device according to claim 7, characterized in that, One of the first and second retaining components has a screw opening. The first retaining member and another retaining member of the second retaining member have screw holes. The handle is secured by a screw inserted into the screw hole through the screw opening, such that the first retaining member and the second retaining member hold the handle in place.

9. The auxiliary device according to claim 8, characterized in that, The handle is configured to extend forward from the handle joint. By releasing the fixation of the handle by the first and second retaining components, which are secured by the screws, the position of the auxiliary rod in the forward and backward direction can be adjusted.

10. The auxiliary device according to any one of claims 6 to 9, characterized in that, The handle connector includes: a left handle connector fixed to the left side of the gear housing, and a right handle connector fixed to the right side of the gear housing. The handle includes: a left rod extending forward from the left handle connector, a right rod extending forward from the right handle connector, and a connecting rod connecting the front ends of the left rod and the right rod. The retaining component is fixed to the left rod portion and the right rod portion. In the left-right direction, the auxiliary rod is positioned further outward than one of the handle joints, the left handle joint and the right handle joint, and a reaction force receiving component is fixed to the other handle joint.

11. The auxiliary device according to claim 1, characterized in that, It has an auxiliary plate disposed on at least one of the left and right sides of the gear housing, which receives the reaction force transmitted from the rotary output section to the gear housing.

12. The auxiliary device according to claim 11, characterized in that, The front end of the auxiliary plate is configured to be further forward than the front end of the gear housing.

13. The auxiliary device according to claim 12, characterized in that, The auxiliary plate is fixed to at least a portion of the auxiliary handle. The auxiliary handle includes: a handle connector comprising a left handle connector fixed to the left side of the gear housing and a right handle connector fixed to the right side of the gear housing, and a handle fixed to the handle connector. The auxiliary plate is fixed to one of the handle joints of the left handle joint and the right handle joint.

14. An electric excavator, characterized in that, have: Motor housing, which houses the motor; A handle housing, which is disposed on the rear side of the motor housing and has a grip portion provided with a trigger switch; A gear housing, disposed on the front side of the motor housing, is used to house the gear; A rotary output section that protrudes downward from the gear housing and is used for mounting drill bits; as well as The accessory device according to any one of claims 1 to 13.

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