Electrically-driven excavator

Abstract

To provide an electrically-driven excavator forming a hole in an object to be excavated with good workability.SOLUTION: An electrically-driven excavator is provided with: a motor housing receiving a motor; a handle housing having a grip part on which a trigger switch to trigger the motor is arranged; a gear housing receiving a speed reduction mechanism; a rotary output section projecting forward from the gear housing and rotating based on rotational power transmitted from the motor through the speed reduction mechanism in a state a drill bit is attached thereon; and a handle fixed on the gear housing and at least a part thereof is arranged in a side direction further than the gear housing.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The technology disclosed herein relates to an electric excavator. [Background technology]

[0002] 2. Description of the Related Art In the technical field related to electric excavators, there is known an electric tool that excavates the ground by rotating an earth auger drill bit, as disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-196098 A Summary of the Invention [Problem to be solved by the invention]

[0004] There are cases where it is necessary to form a hole using an electric drilling machine. For example, there are cases where it is necessary to form a horizontal hole using an electric drilling machine. For example, in plumbing work for installing a sewer pipe underground, there is a demand for a technique that allows the horizontal hole to be formed with good workability.

[0005] The technique disclosed in this specification aims to form a hole in an excavation target with good workability, and in particular to form a lateral hole in the excavation target with good efficiency. [Means for solving the problem]

[0006] This specification discloses an electric drilling machine. The electric drilling machine may include a motor housing that accommodates a motor, a handle housing having a grip part provided with a trigger switch for starting the motor, a gear housing that accommodates a reduction gear mechanism, a rotation output part that protrudes forward from the gear housing and rotates based on a rotation force transmitted from the motor via the reduction gear mechanism with a drill bit attached, and a handle that is fixed to the gear housing and at least a part of which is disposed laterally of the gear housing. Effect of the Invention

[0007] According to the technology disclosed in this specification, a hole can be formed in an excavation target with good workability. In particular, a lateral hole can be formed efficiently in the excavation target. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an electric excavator according to a first embodiment, as viewed from the front. [Diagram 2] FIG. 2 is an exploded perspective view, seen from the front, showing the electric excavator according to the first embodiment. [Diagram 3] FIG. 3 is a side view showing the main body of the electric excavator according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the main body of the electric excavator according to the first embodiment. [Diagram 5] FIG. 5 is a side view for explaining a method of using the electric excavator according to the first embodiment. [Figure 6] FIG. 6 is a perspective view for explaining a method of using the electric excavator according to the first embodiment. [Figure 7] FIG. 7 is a perspective view for explaining a method of using the electric excavator according to the second embodiment. [Figure 8] FIG. 8 is a perspective view for explaining a method of using the electric excavator according to the third embodiment. [Figure 9] FIG. 9 is a front view for explaining a method of using the electric excavator according to the fourth embodiment. [Figure 10] FIG. 10 is a front view for explaining a method of using the electric excavator according to the fourth embodiment. [Figure 11] FIG. 11 is a perspective view for explaining a method of using the electric excavator according to the fifth embodiment. [Figure 12] FIG. 12 is a perspective view showing an additional handle 24 according to the fifth embodiment. [Figure 13] FIG. 13 is a perspective view showing the electric excavator according to the sixth embodiment, seen from the front. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one or more embodiments, the electric drilling machine may include a motor housing that accommodates a motor, a handle housing having a grip portion on which a trigger switch for starting the motor is provided, a gear housing that accommodates a reduction gear mechanism, a rotation output portion that protrudes forward from the gear housing and rotates based on a rotational force transmitted from the motor via the reduction gear mechanism with a drill bit attached, and a handle that is fixed to the gear housing and has at least a portion positioned laterally of the gear housing.

[0010] With the above-described configuration, an operator can perform excavation work while holding the handle with one hand and the grip portion of the handle housing with the other hand, thereby forming a lateral hole in the excavation target with good workability.

[0011] In one or more embodiments, at least a portion of the handle may be disposed to the side of the gear housing so as to be able to receive a reaction force transmitted from the rotational output to the gear housing.

[0012] In the above configuration, during drilling work, a large reaction force may act on the gear housing via the drill bit and the rotary output unit. When the handle disposed on the side of the gear housing is held by the operator's hand, the handle can receive the reaction force acting on the gear housing.

[0013] In one or more embodiments, the handle may include a vertical rod portion extending upward from a side of the gear housing and a horizontal rod portion positioned forward of the gear housing.

[0014] In the above configuration, the worker can grip at least one of the vertical rod portion and the horizontal rod portion depending on the work situation.

[0015] In one or more embodiments, a lower end of the gear housing and at least a portion of the handle may be positioned at the same height, with the motor housing positioned above the gear housing.

[0016] In the above-described configuration, when the lower end of the gear housing is grounded, at least a portion of the handle is also grounded, so that excavation work can be carried out with good workability.

[0017] In one or more embodiments, at least a portion of the handle may be grounded, with the lower end of the gear housing being grounded.

[0018] With the above-described configuration, an operator can perform excavation work while sliding the gear housing and the handle on the ground, respectively.

[0019] In one or more embodiments, the handle may be a loop.

[0020] In the above configuration, the operator can grip any part of the handle.

[0021] In one or more embodiments, the handle may include a straight portion extending laterally from the gear housing and a hand guard portion disposed below the straight portion.

[0022] In the above configuration, when a worker grips the straight portion, the hand guard portion protects the worker's hands from the ground.

[0023] In one or more embodiments, the handle may include a bent portion that bends downward as it moves away from the gear housing, and a straight portion that extends laterally from the gear housing below the bent portion.

[0024] In the above configuration, the operator can grip at least one of any portion of the bent portion and any portion of the straight portion.

[0025] In one or more embodiments, the electric excavator may include a ground engaging member located below the rotary output.

[0026] In the above-mentioned configuration, the operator can perform excavation work while sliding the ground contact member on the ground. Also, the ground contact member can receive the reaction force acting on the gear housing. Therefore, the horizontal hole can be formed in the excavation target with good workability.

[0027] In one or more embodiments, at least a portion of the ground contact member may be disposed laterally from the gear housing.

[0028] In the above configuration, the ground contact member can receive the reaction force acting on the gear housing.

[0029] In one or more embodiments, the grounding member may be fixed to the gear housing.

[0030] In the above configuration, the ground contact member can receive the reaction force acting on the gear housing.

[0031] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0032] In the embodiment, the positional relationship of each part will be described using the terms "left," "right," "front," "rear," "upper," and "lower." These terms refer to directions during work using the electric excavator 1. For example, when the electric excavator 1 is sold at a hardware store or listed in a sales catalog, it is expected that the up-down direction will be reversed.

[0033] [First embodiment] <Electric working equipment> Fig. 1 is a front perspective view showing an electric excavator 1 according to this embodiment. Fig. 2 is an exploded front perspective view showing the electric excavator 1 according to this embodiment.

[0034] The electric drilling machine 1 is a portable electric drilling machine that is held by an operator and excavates an excavation target to form a hole in the excavation target. In this embodiment, the excavation target is underground. The electric drilling machine 1 is used to form a horizontal hole in the ground. The electric drilling machine 1 includes a main body 6, a drill bit 19, an additional handle 20, and a ground contact member 22.

[0035] Fig. 3 is a side view showing the main body 6 of the electric excavator 1 according to this embodiment. Fig. 4 is a cross-sectional view showing the main body 6 of the electric excavator 1 according to this embodiment.

[0036] As shown in Figures 1, 2, 3, and 4, the main body 6 includes a motor housing 2, a handle housing 3, a gear housing 4, a battery attachment section 7, a controller 13, a main switch 10, a trigger switch 11, a forward / reverse rotation switching lever 9, a speed switching lever 15, a motor 8, a reduction mechanism 14, and a rotation output section 5.

[0037] The motor housing 2 accommodates the motor 8. The motor housing 2 is tubular and long in the vertical direction. The motor housing 2 is made of synthetic resin. The motor housing 2 has an exhaust port 2E that connects the internal space of the motor housing 2 to the external space. The exhaust ports 2E are provided on the left, right, and front of the motor housing 2. Air in the internal space of the motor housing 2 is exhausted to the external space via the exhaust port 2E.

[0038] The handle housing 3 is disposed on the upper side of the motor housing 2. The lower part of the handle housing 3 is connected to the upper part of the motor housing 2. The handle housing 3 is in the shape of a long loop in the vertical direction. The handle housing 3 is made of synthetic resin. The handle housing 3 has a front part 3A connected to the upper part of the motor housing 2, a grip part 3B extending upward from the rear part of the front part 3A, a controller accommodating part 3C extending upward from the front part of the front part 3A, and a battery connect part 3D connecting the upper end part of the grip part 3B and the upper end part of the controller accommodating part 3C. The grip part 3B is disposed behind the controller accommodating part 3C. The grip part 3B is disposed on the upper side of the motor housing 2. The operator can hold the grip part 3B with his / her hand. An air intake 3F is provided in the front part of the controller accommodating part 3C.

[0039] The gear housing 4 accommodates the reduction gear mechanism 14. The gear housing 4 is tubular and long in the vertical direction. The gear housing 4 is disposed below the motor housing 2. An upper portion of the gear housing 4 is connected to a lower portion 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 with a cover 4A. In the embodiment, the cover 4A has a two-layer structure of synthetic resin and elastomer.

[0040] A screw hole 16 is provided in each of the left and right parts of the gear housing 4. The position of the screw hole 18 and the position of the rotation output part 5 are substantially the same in the vertical direction.

[0041] A screw hole 18 is provided in each of the left and right parts of the gear housing 4. The screw hole 18 is provided rearward and below the screw hole 16.

[0042] The battery mounting section 7 is disposed at the upper part of the handle housing 3. A battery pack 17 is mounted to the battery mounting section 7. The battery mounting section 7 is provided in the battery connect section 3D of the handle housing 3. In this embodiment, two battery mounting sections 7 are provided in the front-rear direction. By mounting a battery pack 17 to each of the two battery mounting sections 7, two battery packs 17 are disposed in the front-rear direction. The battery packs 17 are detachable from the battery mounting sections 7. By mounting the battery packs 17 to the battery mounting sections 7, the battery packs 17 can supply power to the electric excavator 1. The battery packs 17 include a secondary battery. In this embodiment, the battery packs 17 include a rechargeable lithium-ion battery.

[0043] The controller 13 outputs a control signal for controlling the electric excavator 1. The controller accommodating section 3C has an internal space capable of accommodating the controller 13. The controller 13 is accommodated in the controller accommodating section 3C.

[0044] The main switch 10 is operated by an operator to start the electric excavator 1. The main switch 10 is provided at the rear of the front part 3A. By operating the main switch 10, power is supplied from the battery pack 17 to the controller 13, and the electric excavator 1 starts. By operating the main switch 10, the electric excavator 1 is switched between starting and stopping.

[0045] The trigger switch 11 is operated by an operator to start the motor 8. The trigger switch 11 is provided on the grip portion 3B. The trigger switch 11 includes a trigger lever 11A and a switch circuit 11B. The trigger lever 11A protrudes forward from the front part of the lower part of the grip portion 3B. The operator can operate the trigger lever 11A with a finger so that the trigger lever 11A moves backward while holding the grip portion 3B with one of the left and right hands. The grip portion 3B has an internal space capable of accommodating the switch circuit 11B. The switch circuit 11B is accommodated in the grip portion 3B. The switch circuit 11B outputs an operation signal when the trigger lever 11A is operated. When the electric excavator 1 is started, the trigger lever 11A is operated so as to be pulled backward, whereby power is supplied from the battery pack 17 to the motor 8, and the motor 8 is started. The motor 8 is driven based on the operation signal output from the switch circuit 11B. By switching between operating and releasing the trigger lever 11A, the motor 8 is switched between being driven and being stopped.

[0046] The forward / reverse switching lever 9 is operated by an operator to switch the rotation direction of the motor 8. The forward / reverse switching lever 9 is provided on the front portion 3A. By operating the forward / reverse switching lever 9 left or right, the rotation direction of the motor 8 is switched between the forward direction and the reverse direction. By switching the rotation direction of the motor 8, the rotation direction of the rotation output unit 5 is switched between the forward direction and the reverse direction.

[0047] The speed change lever 15 is operated by an operator to change the rotation speed of the rotation output part 5. The speed change lever 15 is provided at the front part of the gear housing 4. By operating the speed change lever 15 in the up or down direction, the rotation speed of the rotation output part 5 is changed between a first speed and a second speed which is higher than the first speed.

[0048] The motor 8 generates a rotational force for rotating the rotation output unit 5. The motor 8 is driven based on the power supplied from the battery pack 17. The motor 8 is an inner rotor type brushless motor. The motor 8 has a cylindrical stator 81 and a rotor 82 arranged inside the stator 81. The rotation axis of the rotor 82 extends in the vertical direction.

[0049] The stator 81 has a stator core 81A including a plurality of laminated steel plates, a first insulator 81B arranged on the lower part of the stator core 81A, a second insulator 81C arranged on the upper part of the stator core 81A, a plurality of coils 81D wound around the stator core 81A via the first insulator 81B and the second insulator 81C, a sensor circuit board 81E attached to the second insulator 81C, and a connecting member 81F supported by the second insulator 81C. The sensor circuit board 81E has a plurality of rotation detection elements that detect the rotation of the rotor 82.

[0050] The rotor 82 has a rotor shaft 82A, a cylindrical rotor core 82B arranged around the rotor shaft 82A, and a plurality of permanent magnets 82C held by the rotor core 82B. A lower part of the rotor shaft 82A is rotatably supported by a bearing 83. An upper part of the rotor shaft 82A is rotatably supported by a bearing 84.

[0051] A centrifugal fan 85 is attached to the rotor shaft 82A between the bearing 83 and the stator 81. An exhaust port 2E of the motor housing 2 is disposed at a part of the periphery of the centrifugal fan 85. As the rotor shaft 82A rotates and the centrifugal fan 85 rotates, air in the internal space of the motor housing 2 is exhausted to the external space of the motor housing 2 through the exhaust port 2E.

[0052] A pinion gear 141S is provided at the lower end of the rotor shaft 82A. The pinion gear 141S is disposed in the internal space of the gear housing 4. The rotor shaft 82A is connected to the reduction gear mechanism 14 via the pinion gear 141S.

[0053] The reduction gear mechanism 14 transmits the rotational force generated by the motor 8 to the rotation output unit 5. The reduction gear mechanism 14 transmits the rotational force from the rotor shaft 82A to the rotation output unit 5. The reduction gear mechanism 14 includes a plurality of gears. The reduction gear mechanism 14 has a first planetary gear mechanism 141, a second planetary gear mechanism 142, an intermediate shaft 143, and an output shaft 144.

[0054] The first planetary gear mechanism 141 is disposed below the rotor shaft 82A. The intermediate shaft 143 is disposed below the first planetary gear mechanism 141. The second planetary gear mechanism 142 is disposed below the intermediate shaft 143. The output shaft 144 is disposed below the second planetary gear mechanism 142.

[0055] The first planetary gear mechanism 141 has a pinion gear 141S that functions as a sun gear, a number of planetary gears 141P arranged around the pinion gear 141S, a first carrier 141C that rotatably supports the number of planetary gears 141P, an internal gear 141R arranged around the number of planetary gears 141P, and a support pin 145 held by the first carrier 141C.

[0056] The pinion gear 141S is provided at the lower end of the rotor shaft 82A. The multiple planetary gears 141P mesh with the pinion gear 141S and the internal gear 141R, respectively. The first carrier 141C holds a support pin 145. The support pin 145 extends in the vertical direction. The support pin 145 is connected to the planetary gear 141P. The first carrier 141C rotatably supports the planetary gear 141P via the support pin 145.

[0057] The second planetary gear mechanism 142 has a sun gear 142S, a number of planetary gears 142P arranged around the sun gear 142S, a second carrier 142C that rotatably supports the number of planetary gears 142P, an internal gear 142R arranged around the number of planetary gears 142P, and a support pin 146 held by the second carrier 142C.

[0058] The sun gear 142S is provided at the lower end of the intermediate shaft 143. The multiple planetary gears 142P mesh with the sun gear 142S and the internal gear 142R, respectively. The second carrier 142C holds a support pin 146. The support pin 146 extends in the vertical direction. The support pin 146 protrudes upward from the second carrier 142C. The support pin 146 rotatably supports the planetary gear 142P. An upper end of the support pin 146 protrudes upward from the planetary gear 142P. The second carrier 142C rotatably supports the planetary gear 142P via the support pin 146.

[0059] An internal gear 141R of the first planetary gear mechanism 141 is fixed to the gear housing 4. The internal gear 141R does not rotate. An internal gear 142R of the second planetary gear mechanism 142 is rotatable.

[0060] The output shaft 144 is rotatably supported by a bearing 147. The upper end of the output shaft 144 is fixed to the second carrier 142C. A bevel gear 148 is provided at the lower end of the output shaft 144. The lower end of the output shaft 144 is connected to the rotation output unit 5 via the bevel gear 148. When the second carrier 142C rotates, the second carrier 142C and the output shaft 144 rotate together.

[0061] The rotation axis of the rotor shaft 82A, the rotation axis of the first carrier 141C, the rotation axis of the intermediate shaft 143, the rotation axis of the second carrier 142C, and the rotation axis of the output shaft 144 coincide with each other.

[0062] The speed reduction mechanism 14 has a switching member 150 that is movable in the vertical direction between the first planetary gear mechanism 141 and the second planetary gear mechanism 142. The switching member 150 is disposed around the intermediate shaft 143. The switching member 150 is connected to the speed switch lever 15. The switching member 150 moves in the vertical direction when the speed switch lever 15 is operated. An operator can move the switching member 150 in the vertical direction by operating the speed switch lever 15.

[0063] The switching member 150 is disposed below the first carrier 141C. A lower portion of the support pin 145 protrudes downward from the first carrier 141C. The switching member 150 has a hole 150H into which the support pin 145 protruding downward from the first carrier 141C is inserted. The switching member 150 is movable in the vertical direction while being guided by the support pin 145. The rotational speed of the rotation output unit 5 is switched by the vertical movement of the switching member 150.

[0064] The speed reduction mechanism 14 also has a connection member 151 provided on the upper part of the planetary gear 142P. The connection member 151 has a hole 151H into which a support pin 146 protruding upward from the planetary gear 142P is inserted. The connection member 151 is coupled to the second carrier 142C via the support pin 146.

[0065] The switching member 150 is movable between a first position and a second position that is lower than the first position. The switching member 150 is movable between the first position and the second position while being guided by the support pin 145.

[0066] When the switching member 150 is disposed at the first position, the switching member 150 is connected to each of the first carrier 141C and the intermediate shaft 143. When the switching member 150 is disposed at the first position, the switching member 150 is separated from the connection member 151. When the switching member 150 is disposed at the first position, the first carrier 141C, the upper end of the intermediate shaft 143, and the switching member 150 become integrated. When the switching member 150 is disposed at the first position, when the first carrier 141C rotates, the first carrier 141C, the intermediate shaft 143, and the switching member 150 rotate together.

[0067] When the switching member 150 is disposed at the second position, the switching member 150 is connected to the connecting member 151. When the switching member 150 is disposed at the second position, the switching member 150 is separated from the first carrier 141C and the intermediate shaft 143. When the switching member 150 is disposed at the second position, the upper end of the intermediate shaft 143 and the first carrier 141C are separated. When the switching member 150 is disposed at the second position, the connecting member 151 and the switching member 150 are integrated. The support pin 145 is disposed in a hole 150H of the switching member 150. The support pin 145 is connected to the planetary gear 141P. When the switching member 150 is disposed at the second position, when the planetary gear 141P revolves, the connecting member 151 and the switching member 150 rotate together.

[0068] When the switching member 150 is disposed in the first position, the switching member 150 and the intermediate shaft 143 are connected by a spline connection. When the switching member 150 is disposed in the second position, the spline connection is released, and the connection between the switching member 150 and the intermediate shaft 143 is released.

[0069] When the rotor shaft 82A rotates by the drive of the motor 8 in a state where the switching member 150 is disposed in the first position, the pinion gear 141S rotates, and the planetary gear 141P revolves around the pinion gear 141S. In a state where the switching member 150 is disposed in the first position, the first carrier 141C, the upper end of the intermediate shaft 143, and the switching member 150 are integral. Due to the revolution of the planetary gear 141P, the first carrier 141C, the intermediate shaft 143, and the switching member 150 rotate together at a rotation speed lower than the rotation speed of the rotor shaft 82A. Due to the rotation of the intermediate shaft 143, the sun gear 142S rotates. When the sun gear 142S rotates, the planetary gear 142P revolves around the sun gear 142S. Due to the revolution of the planetary gear 142P, the second carrier 142C and the output shaft 144 rotate at a rotational speed lower than the rotational speed of the intermediate shaft 143. In this manner, when the motor 8 is driven in a state in which the switching member 150 is disposed in the first position, both the speed reduction function of the first planetary gear mechanism 141 and the speed reduction function of the second planetary gear mechanism 142 are exerted, and the output shaft 144 rotates at the first speed.

[0070] When the rotor shaft 82A rotates by the drive of the motor 8 in a state where the switching member 150 is arranged in the second position, the pinion gear 141S rotates, and the planetary gear 141P revolves around the pinion gear 141S. Due to the revolution of the planetary gear 141P, the first carrier 141C rotates together with the rotor shaft 82A at a rotation speed lower than the rotation speed of the rotor shaft 82A. In a state where the switching member 150 is arranged in the second position, the switching member 150 is separated from the first carrier 141C and the intermediate shaft 143. In a state where the switching member 150 is arranged in the second position, the upper end portion of the intermediate shaft 143 and the first carrier 141C are separated. In a state where the switching member 150 is arranged in the second position, the connection member 151 and the switching member 150 are integral with each other. In a state where the switching member 150 is disposed in the second position, the support pin 145 is disposed in the hole 150H of the switching member 150. Due to the revolution of the planetary gear 141P, the connecting member 151 and the switching member 150 rotate at the same rotation speed as the rotation speed of the first carrier 141C. Due to the rotation of the connecting member 151, the planetary gear 142P revolves at the same revolution speed as the rotation speed of the connecting member 151. Due to the revolution of the planetary gear 142P, the second carrier 142C and the output shaft 144 rotate at the same rotation speed. In this way, when the motor 8 is driven in a state where the switching member 150 is disposed in the second position, the deceleration function of the first planetary gear mechanism 141 is exerted, but the deceleration function of the second planetary gear mechanism 142 is not exerted, and the output shaft 144 rotates at the second speed.

[0071] The rotation output part 5 rotates based on the rotational force transmitted from the motor 8 via the reduction mechanism 14. The rotation output part 5 protrudes forward from the lower part of the gear housing 4. A drill bit is attached to the rotation output part 5. The rotation output part 5 is rotatable with the drill bit attached. The rotation axis of the rotation output part 5 extends in the front-rear direction. The rotation axis of the motor 8 and the rotation axis of the rotation output part 5 are perpendicular to each other.

[0072] The rotary output unit 5 includes a spindle 51 and a drill chuck 52 attached to the front end of the spindle 51. The drill chuck 52 has an insertion hole 52A into which a drill bit is inserted. The insertion hole 52A is formed so as to extend rearward from the front end of the drill chuck 52. The drill chuck 52 is rotatable with the drill bit 19 attached thereto.

[0073] The spindle 51 is rotatably supported by a needle bearing 53 and a ball bearing 54. The needle bearing 53 rotatably supports the rear end of the spindle 51. The ball bearing 54 rotatably supports the front portion of the spindle 51.

[0074] A bevel gear 55 is provided at the rear of the spindle 51. The bevel gear 55 meshes with a 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 larger than the number of teeth of the bevel gear 148.

[0075] The drill bit 19 is attached to the rotary output unit 5. The drill bit 19 is a drill bit for drilling called an earth auger drill bit. The drill bit 19 has a drilling shaft 19A, a drilling double helix blade 19B, a tip bit 19C, and two cutting blades 19D.

[0076] The drilling shaft 19A extends in the front-rear direction. When attaching the drill bit 19 to the rotary output unit 5, an adapter 5A is inserted into the insertion hole 52A of the drill chuck 52. The adapter 5A is a rod-shaped member. A hole into which the adapter 5A is inserted is provided at the rear end of the drilling shaft 19A. With the adapter 5A inserted into the hole at the rear end of the drilling shaft 19A, the rear end of the drilling shaft 19A and the adapter 5A are fixed by a fixing device 5B. The rear end of the drilling shaft 19A is attached to the drill chuck 52 via the adapter 5A.

[0077] The drilling double helix blade 19B is arranged in a double spiral shape around the drilling shaft 19A. The drilling double helix blade 19B is fixed to the drilling shaft 19A. The tip bit 19C is arranged at the front end of the drilling shaft 19A. Each of the two cutting blades 19D is arranged at the front end of the drilling double helix blade 19B.

[0078] The additional handle 20 is fixed to the gear housing 4 via a handle joint 21. The handle joints 21 are arranged on the left and right sides of the gear housing 4. The handle joint 21 includes a base portion 211 having screw openings 21C and 21D, and a fixing portion 212 having a screw opening 21B. The screw inserted into the screw opening 21C is coupled to the screw hole 16. The screw inserted into the screw opening 21D is coupled to the screw hole 18. In this way, the base portion 211 of the handle joint 21 is fixed to the gear housing 4.

[0079] At least a portion of the additional handle 20 is disposed laterally of the gear housing 4. Lateral of the gear housing 4 means one or both of the left and right of the gear housing 4. In this embodiment, a portion of the additional handle 20 is disposed to the left of the gear housing 4. A portion of the additional handle 20 is disposed to the right of the gear housing 4.

[0080] The additional handle 20 is produced by bending a hollow metal pipe. The additional handle 20 includes an insertion portion 20C fixed between the base portion 211 and the fixed portion 212 of the handle joint 21, a vertical rod portion 20B extending upward from the insertion portion 20C, and a horizontal rod portion 20A extending in the left-right direction. A pair of insertion portions 20C is provided. The pair of insertion portions 20C are arranged with a gap in between in the left-right direction. A pair of vertical rod portions 20B is provided. The pair of vertical rod portions 20B are arranged with a gap in between in the left-right direction. An upper portion of the vertical rod portion 20B is inclined forward toward the top. The horizontal rod portion 20A is arranged to connect the upper ends of the pair of vertical rod portions 20B.

[0081] A plurality of screw openings are provided in the insertion portion 20C. The plurality of screw openings in the insertion portion 20C are provided at intervals in the up-down direction. A screw opening 21B is provided in the fixing portion 212 of the handle joint 21. A screw hole 21A is provided in the base portion 211 of the handle joint 21. With the insertion portion 20C disposed between the base portion 211 and the fixing portion 212, a screw inserted into the screw opening 21B is coupled to the screw hole 21A via the screw opening of the insertion portion 20C. This fixes the additional handle 20 to the handle joint 21.

[0082] The additional handle 20 is fixed to the handle joint 21, and the handle joint 21 is fixed to the gear housing 4, whereby the additional handle 20 is fixed to the gear housing 4 via the handle joint 21. With the additional handle 20 fixed to the gear housing 4 via the handle joint 21, the vertical rod portion 20B extends upward from the side of the gear housing 4. One vertical rod portion 20B extends upward from the left portion of the gear housing 4. The other vertical rod portion 20B extends upward from the right portion of the gear housing 4. The horizontal rod portion 20A is disposed forward of the gear housing 4.

[0083] The grounding member 22 is disposed below the rotation output portion 5. At least a portion of the grounding member 22 is disposed laterally of the gear housing 4. The left portion of the grounding member 22 is disposed to the left of the gear housing 4. The right portion of the grounding member 22 is disposed to the right of the gear housing 4. In other words, the left end portion of the grounding member 22 is disposed to the left of the left surface of the gear housing 4. The right end portion of the grounding member 22 is disposed to the right of the right surface of the gear housing 4.

[0084] The grounding member 22 is fixed to the gear housing 4 via the handle joint 21. The base portion 211 of the handle joint 21 has an insertion hole (not shown) extending upward from the lower surface of the base portion 211. The grounding member 22 has an insertion portion 22C that is inserted into the insertion hole of the base portion 211. A pair of insertion portions 22C is provided. The pair of insertion portions 22C are arranged at a distance in the left-right direction. A plurality of screw holes 22D are provided in the insertion portion 22C. The plurality of screw holes 22D are provided at a distance in the up-down direction. A screw opening 21E is provided in the handle joint 21. With the insertion portion 22C inserted into the second insertion hole, a screw inserted into the screw opening 21E is coupled to the screw hole 22D. This fixes the grounding member 22 to the handle joint 21.

[0085] The ground contact member 22 is fixed to the handle joint 21, and the handle joint 21 is fixed to the gear housing 4, whereby the ground contact member 22 is fixed to the gear housing 4 via the handle joint 21. With the ground contact member 22 fixed to the gear housing 4 via the handle joint 21, a ground contact surface 22A of the ground contact member 22 faces downward, and a front surface 22B of the ground contact member 22 faces forward.

[0086] <How to use> Next, a method of using the electric excavator 1 according to this embodiment will be described. FIG. 5 is a side view for explaining a method of using the electric excavator 1 according to this embodiment. FIG. 6 is a perspective view for explaining a method of using the electric excavator 1 according to this embodiment. The electric excavator 1 is used to form a horizontal hole in an excavation target. The electric excavator 1 is used with the motor housing 2 disposed above the gear housing 4. That is, the electric excavator 1 is used in a vertically placed state. In the vertically placed state with the motor housing 2 disposed above the gear housing 4, the ground contact member 22 is fixed to the gear housing 4. The ground contact member 22 is disposed so as to come into contact with the ground.

[0087] The operator holds the additional handle 20 with his left hand and holds the grip portion 3B of the handle housing 3 with his right hand. The operator can hold the left side of the horizontal rod portion 20A or the left side of the vertical rod portion 20B with his left hand. The operator operates the trigger lever 11A with the little finger of his right hand that is holding the grip portion 3B. By operating the trigger lever 11A, the rotation output portion 5 rotates in the direction indicated by the arrow in Figure 6 with the drill bit 19 attached.

[0088] With the ground contact surface 22A of the ground contact member 22 in contact with the ground, the operator presses the front end portion 19U of the rotating drill bit 19 against the excavation target present in front of the electric excavator 1. The rotating drill bit 19 is pressed against the excavation target, so that the excavation target is excavated and a horizontal hole is formed in the excavation target. With the drill bit 19 rotating, the operator pushes the electric excavator 1 forward. The ground contact member 22 can slide on the ground. This allows the electric excavator 1 to move smoothly forward. When discharging the excavated material from the horizontal hole formed in the excavation target, the operator pulls out the electric excavator 1 backward. The ground contact member 22 can slide on the ground. The electric excavator 1 can also move smoothly backward.

[0089] The operator may hold the additional handle 20 with his / her right hand and the grip portion 3B of the handle housing 3 with his / her left hand. The operator may hold the right side of the horizontal rod portion 20A or the right side of the vertical rod portion 20B with his / her right hand.

[0090] When drilling an excavation target, a large reaction force may act on the gear housing 4 via the drill bit 19 and the rotation output part 5. When the drill bit 19 rotates in the rotation direction shown by the arrow in Fig. 6, a reaction force may act so as to tilt the upper end part of the main body 6 to the left.

[0091] In this embodiment, the left portion of the ground contact member 22 is disposed to the left of the gear housing 4. When the left portion of the ground contact member 22 comes into contact with the ground, the ground contact member 22 can receive a reaction force acting on the gear housing 4.

[0092] In addition, when the additional handle 20 is gripped by the operator's hand, the additional handle 20 can receive the reaction force acting on the gear housing 4.

[0093] In addition, when the grip portion 3B is gripped by the hand of an operator, the handle housing 3 can receive a reaction force acting on the gear housing 4.

[0094] <Effects> As described above, the electric drilling machine 1 comprises a motor housing 2 that accommodates the motor 8, a handle housing 3 having a grip portion 3B on which a trigger switch 11 for starting the motor 8 is provided, a gear housing 4 that accommodates the reduction mechanism 14, a rotation output portion 5 that protrudes forward from the gear housing 4 and rotates based on the rotational force transmitted from the motor 8 via the reduction mechanism 14 with a drill bit 19 attached, and an additional handle 20 that is fixed to the gear housing 4 and has at least a portion thereof positioned laterally of the gear housing 4.

[0095] In the above configuration, the operator can perform excavation work while holding the additional handle 20 with one hand and holding the grip portion 3B of the handle housing 3 with the other hand. This allows a lateral hole to be formed in the excavation target with good workability.

[0096] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0097] 7 is a perspective view for explaining a method of using the electric excavator 1 according to this embodiment. In this embodiment, the ground contact member 22 and the handle joint 21 are omitted.

[0098] A loop-shaped additional handle 23 is fixed to the left part of the gear housing 4. The additional handle 23 includes a facing part 23B facing the left surface of the gear housing 4, a grip part 23E disposed to the left of the facing part 23B, an upper connecting part 23C connecting an upper part of the facing part 23B to an upper part of the grip part 23E, and a lower connecting part 23D connecting a lower part of the facing part 23B to a lower part of the grip part 23E. A screw opening 23A is provided in the facing part 23B. A screw inserted into the screw opening 23A is coupled to the screw hole 18. This fixes the additional handle 23 to the gear housing 4.

[0099] As in the first embodiment described above, the electric excavator 1 is used in a vertically placed state in which the motor housing 2 is disposed above the gear housing 4. In a vertically placed state in which the motor housing 2 is disposed above the gear housing 4, the lower end of the gear housing 4 and at least a part of the additional handle 23 are disposed at the same height. In the embodiment, the lower end of the gear housing 4 and the lower end of the lower connecting portion 23D are disposed at the same height. In addition, with the lower end of the gear housing 4 being grounded, at least a part of the additional handle 23 is grounded. In the embodiment, the lower end of the lower connecting portion 23D is grounded.

[0100] The operator holds the handle portion 23E of the additional handle 23 with his left hand, and holds the grip portion 3B of the handle housing 3 with his right hand. The operator operates the trigger lever 11A with the fingers of his right hand holding the grip portion 3B. By operating the trigger lever 11A, the rotation output portion 5 rotates in the direction indicated by the arrow in FIG. 7 with the drill bit 19 attached.

[0101] With the lower connecting part 23D of the additional handle 23 in contact with the ground, the operator presses the front end part 19U of the rotating drill bit 19 against the excavation target present in front of the electric excavator 1. The rotating drill bit 19 is pressed against the excavation target, so that the excavation target is excavated and a horizontal hole is formed in the excavation target. With the drill bit 19 rotating, the operator pushes the electric excavator 1 forward. The lower connecting part 23D can slide on the ground. This allows the electric excavator 1 to move smoothly forward. When discharging the excavated material from the horizontal hole formed in the excavation target, the operator pulls out the electric excavator 1 backward. The lower connecting part 23D can slide on the ground. The electric excavator 1 can also move smoothly backward.

[0102] When drilling an excavation target, a large reaction force may act on the gear housing 4 via the drill bit 19 and the rotation output part 5. When the drill bit 19 rotates in the rotation direction shown by the arrow in Fig. 7, a reaction force may act so as to tilt the upper end part of the main body 6 to the left.

[0103] At least a part of the additional handle 23 is disposed on the side of the gear housing 4 so as to be able to receive the reaction force transmitted from the rotation output portion 5 to the gear housing 4. In this embodiment, the additional handle 23 is disposed to the left of the gear housing 4. When the grip portion 23E of the additional handle 23 is held by the operator's hand and the lower connecting portion 23D of the additional handle 23 comes into contact with the ground, the additional handle 23 can receive the reaction force acting on the gear housing 4.

[0104] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0105] 8 is a perspective view for explaining a method of using the electric excavator 1 according to this embodiment. In this embodiment, the ground contact member 22 and the additional handle 23 described in the above embodiment are fixed to the gear housing 4.

[0106] In this embodiment, the left portion of the ground contact member 22 is disposed below the additional handle 23. In this embodiment, the amount of leftward protrusion of the ground contact member 22 from the left surface of the gear housing 4 is greater than the amount of leftward protrusion of the ground contact member 22 described in the above-mentioned first embodiment. The additional handle 23 does not come into contact with the ground.

[0107] In this embodiment, the amount of leftward protrusion of the ground contact member 22 from the left surface of the gear housing 4 is large, so that the left part of the ground contact member 22 comes into contact with the ground, whereby the ground contact member 22 can receive a reaction force acting on the gear housing 4. In addition, when the grip portion 23E of the additional handle 23 disposed to the left of the gear housing 4 is gripped by the operator's hand, the additional handle 23 can receive a reaction force acting on the gear housing 4.

[0108] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0109] Fig. 9 is a front view for explaining how to use the electric excavator 1 according to this embodiment. Fig. 10 is a perspective view for explaining how to use the electric excavator 1 according to this embodiment. In this embodiment, the electric excavator 1 is used in a horizontally placed state in which the motor housing 2 is disposed to the side (right) of the gear housing 4. The ground contact member 22 and additional handle 23 described in the above embodiment are attached to the main body 6.

[0110] In a horizontally placed state in which the motor housing 2 is disposed laterally of the gear housing 4, the additional handle 23 is disposed above the gear housing 4. The additional handle 23 is fixed to the gear housing 4. The ground contact member 22 is fixed to the handle housing 3.

[0111] The operator holds the handle portion 23E of the additional handle 23 with his right hand and holds the grip portion 3B of the handle housing 3 with his left hand. The operator operates the trigger lever 11A with the fingers of his left hand holding the grip portion 3B. By operating the trigger lever 11A, the rotation output portion 5 rotates in the direction indicated by the arrow in FIG. 10 with the drill bit 19 attached.

[0112] With the ground contact member 22 in contact with the ground, the operator presses the front end 19U of the rotating drill bit 19 against the excavation target present in front of the electric excavator 1. The rotating drill bit 19 is pressed against the excavation target, so that the excavation target is excavated and a horizontal hole is formed in the excavation target. With the drill bit 19 rotating, the operator pushes the electric excavator 1 forward. The ground contact member 22 can slide on the ground. This allows the electric excavator 1 to move smoothly forward. When discharging the excavated material from the horizontal hole formed in the excavation target, the operator pulls out the electric excavator 1 backward. The ground contact member 22 can slide on the ground. The electric excavator 1 can also move smoothly backward.

[0113] In this embodiment, the additional handle 23 is disposed above the gear housing 4. When the grip portion 23E of the additional handle 23 is gripped by the operator's hand, the additional handle 23 can receive a reaction force acting on the gear housing 4. In addition, when the ground contact member 22 disposed to the left of the gear housing 4 comes into contact with the ground, the ground contact member 22 can receive a reaction force acting on the gear housing 4.

[0114] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0115] FIG. 11 is a perspective view for explaining a method of using the electric excavator 1 according to this embodiment. FIG. 12 is a perspective view showing the additional handle 24 according to this embodiment. In this embodiment, a loop-shaped additional handle 24 is fixed to the left part of the gear housing 4. The additional handle 24 includes a facing part 24A facing the left surface of the gear housing 4, a connecting part 24F arranged to the left of the facing part 24A, a straight part 24D connecting an upper part of the facing part 24A and an upper part of the connecting part 24F, and a hand guard part 24E connecting a lower part of the facing part 24A and a lower part of the connecting part 24F. The straight part 24D is provided so as to extend laterally (leftward) from the gear housing 4. The hand guard part 24E is arranged below the straight part 24D. A lower end part 24G of the connecting part 24F is arranged below the hand guard part 24E.

[0116] The opposing portion 24A is provided with a screw opening 24B and a screw opening 24C. A screw inserted into the screw opening 24B is coupled to the screw hole 16. A screw inserted into the screw opening 24C is coupled to the screw hole 18. In this way, the additional handle 24 is fixed to the gear housing 4.

[0117] In this embodiment, the electric excavator 1 is used in a vertically placed state in which the motor housing 2 is arranged above the gear housing 4. In the vertically placed state in which the motor housing 2 is arranged above the gear housing 4, the lower end of the gear housing 4 and at least a part of the additional handle 24 are arranged at the same height. In this embodiment, the lower end of the gear housing 4 and the lower end 24G of the connecting portion 24F are arranged at the same height. In addition, with the lower end of the gear housing 4 being grounded, at least a part of the additional handle 24 is grounded. In this embodiment, the lower end 24G of the connecting portion 24F is grounded.

[0118] The operator holds the straight portion 24D of the additional handle 24 with his left hand and holds the grip portion 3B of the handle housing 3 with his right hand. The operator operates the trigger lever 11A with the fingers of his right hand holding the grip portion 3B. By operating the trigger lever 11A, the rotation output portion 5 rotates in the direction indicated by the arrow in FIG. 11 with the drill bit 19 attached.

[0119] With the lower end 24G of the connecting part 24F in contact with the ground, the operator presses the front end 19U of the rotating drill bit 19 against the excavation target present in front of the electric excavator 1. The rotating drill bit 19 is pressed against the excavation target, so that the excavation target is excavated and a horizontal hole is formed in the excavation target. With the drill bit 19 rotating, the operator pushes the electric excavator 1 forward. The lower end 24G of the connecting part 24F can slide on the ground. This allows the electric excavator 1 to move smoothly forward. When discharging the excavated material from the horizontal hole formed in the excavation target, the operator pulls out the electric excavator 1 backward. The lower end 24G of the connecting part 24F can slide on the ground. The electric excavator 1 can also move smoothly backward.

[0120] In this embodiment, the additional handle 24 is disposed to the left of the gear housing 4. When the straight portion 24D of the additional handle 24 is gripped by the operator's hand and the lower end portion 24G of the connecting portion 24F of the additional handle 24 comes into contact with the ground, the additional handle 24 can receive a reaction force acting on the gear housing 4. In addition, the hand guard portion 24E prevents the operator's left hand from coming into contact with the ground. When the additional handle 24 receives a reaction force acting on the gear housing 4, the hand guard portion 24E can prevent the operator's hand (left hand) from being pinched between the ground and the straight portion 24D.

[0121] In this embodiment, the lower end 24G is provided so as to protrude downward from the left end of the hand guard portion 24E, and is disposed at a position in the additional handle 24 that is farthest from the rotation output portion 5. Therefore, the lower end 24G that comes into contact with the ground can fully receive the reaction force acting on the gear housing 4. In addition, since the area of ​​the lower end 24G that comes into contact with the ground is small, the electric excavator 1 can move smoothly in the front-rear direction.

[0122] [Sixth embodiment] A sixth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0123] FIG. 13 is a front perspective view showing the electric excavator 1 according to this embodiment. In this embodiment, a loop-shaped additional handle 25 is fixed to the left part of the gear housing 4. The additional handle 25 includes a facing part 25A facing the left surface of the gear housing 4, a bent part 25D connected to the upper end part of the facing part 25A, and a straight part 25E connected to the lower part of the facing part 25A. The bent part 25D bends downward as it moves away from the gear housing 4 to the left. The straight part 25E is provided so as to extend laterally (leftward) from the gear housing 4 below the bent part 25D. The left end part of the straight part 25E is connected to a part of the bent part 25D. The lower end part 25F of the bent part 25D is disposed below the straight part 25E.

[0124] The opposing portion 25A is provided with a screw opening 25B and a screw opening 25C. A screw inserted into the screw opening 25B is coupled to the screw hole 16. A screw inserted into the screw opening 25C is coupled to the screw hole 18. In this way, the additional handle 25 is fixed to the gear housing 4.

[0125] In this embodiment, the electric excavator 1 is used in a vertically placed state in which the motor housing 2 is disposed above the gear housing 4. In the vertically placed state in which the motor housing 2 is disposed above the gear housing 4, the lower end of the gear housing 4 and at least a part of the additional handle 24 are disposed at the same height. In this embodiment, the lower end of the gear housing 4 and a lower end 25F of the bent portion 25D are disposed at the same height. In addition, with the lower end of the gear housing 4 being grounded, at least a part of the additional handle 25 is grounded. In this embodiment, the lower end 25F of the bent portion 25D is grounded.

[0126] The operator holds the bent portion 25D of the additional handle 25 with his left hand, and holds the grip portion 3B of the handle housing 3 with his right hand. The operator may hold the straight portion 25E of the additional handle 25 with his left hand. The operator operates the trigger lever 11A with the fingers of his right hand holding the grip portion 3B. By operating the trigger lever 11A, the rotation output portion 5 rotates in the direction indicated by the arrow in FIG. 13 with the drill bit 19 attached.

[0127] The operator presses the front end 19U of the rotating drill bit 19 against the excavation target present in front of the electric excavator 1 with the lower end 25F of the bent portion 25D in contact with the ground. The rotating drill bit 19 is pressed against the excavation target, so that the excavation target is excavated and a horizontal hole is formed in the excavation target. The operator pushes the electric excavator 1 forward with the drill bit 19 rotating. The lower end 25F of the bent portion 25D can slide on the ground. This allows the electric excavator 1 to move smoothly forward. When discharging the excavated material from the horizontal hole formed in the excavation target, the operator pulls out the electric excavator 1 backward. The lower end 25F of the bent portion 25D can slide on the ground. The electric excavator 1 can also move smoothly backward.

[0128] In this embodiment, the area of ​​the lower end 25F that comes into contact with the ground is small, so that the electric excavator 1 can move smoothly in the front-rear direction.

[0129] In this embodiment, the additional handle 25 is disposed to the left of the gear housing 4. When the bent portion 25D of the additional handle 25 is gripped by the operator's hand and the lower end portion 25F of the bent portion 25D of the additional handle 25 comes into contact with the ground, the additional handle 25 can receive a reaction force acting on the gear housing 4. [Explanation of symbols]

[0130] 1...electric excavator, 2...motor housing, 2E...exhaust port, 3...handle housing, 3A...front section, 3B...grip section, 3C...controller housing section, 3D...battery connector section, 3F...intake port, 4...gear housing, 4A...cover, 5...rotation output section, 5A...adapter, 5B...fixing device, 6...main body, 7...battery mounting section, 8...motor, 9...forward / reverse switching lever, 10...main switch, 11...trigger switch, 11A...trigger lever, 11B...switch circuit, 13...controller, 14...reduction mechanism, 15...speed switching lever, 16...screw hole, 17...battery Pack, 18...screw hole, 19...drill bit, 19A...drilling shaft, 19B...drilling double helix blade, 19C...tip bit, 19D...cutting blade, 19U...front end, 20...additional handle, 20A...horizontal rod portion, 20B...vertical rod portion, 20C...insertion portion, 21...handle joint, 21A...screw hole, 21B...screw opening, 21C...screw opening, 21D...screw opening, 21E...screw opening, 22...grounding member, 22A...grounding surface, 22B...front surface, 22C...insertion portion, 22D...screw hole, 23...additional handle, 23A...screw opening, 23B...opposing portion, 23C...upper connecting portion, 23D ...lower connecting portion, 23E...gripping portion, 24...additional handle, 24A...opposing portion, 24B...screw opening, 24C...screw opening, 24D...straight portion, 24E...hand guard portion, 24F...connecting portion, 24G...lower end portion, 25...additional handle, 25A...opposing portion, 25B...screw opening, 25C...screw opening, 25D...bent portion, 25E...straight portion, 25F...lower end portion, 51...spindle, 52...drill chuck, 52A...insertion hole, 53...needle bearing, 54...ball bearing, 55...bevel gear, 81...stator, 81A...stator core, 81B...first insulator motor, 81C...second insulator, 81D...coil, 81E...sensor circuit board, 81F...connecting member, 82...rotor, 82A...rotor shaft, 82B...rotor core, 82C...permanent magnet, 83...bearing, 84...bearing, 85...centrifugal fan, 141...first planetary gear mechanism, 141C...first carrier, 141P...planetary gear, 141R...internal gear, 141S...pinion gear, 142...second planetary gear mechanism, 142C...second 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 member, 150H: hole, 151: connection member, 151H: hole, 211: base portion, 212: fixed portion.

Claims

1. A motor housing that houses a motor, A handle housing having a grip portion provided with a trigger switch for starting the motor, A gear housing that houses a speed reduction mechanism, A rotary output portion that protrudes forward from the gear housing and rotates based on the rotational force transmitted from the motor via the speed reduction mechanism with a drill bit attached, A handle fixed to the gear housing, at least a part of which is disposed laterally of the gear housing, An electric excavator.

2. At least a part of the handle is disposed laterally of the gear housing so as to be able to receive a reaction force transmitted from the rotary output portion to the gear housing, The electric excavator according to Claim 1.

3. The handle includes a vertical rod portion extending upward from a side portion of the gear housing and a horizontal rod portion disposed forward of the gear housing, The electric excavator according to Claim 1.

4. With the motor housing disposed above the gear housing, the lower end portion of the gear housing and at least a part of the handle are disposed at the same height, The electric excavator according to Claim 1.

5. With the lower end portion of the gear housing grounded, at least a part of the handle is grounded, The electric excavator according to Claim 4.

6. The handle is loop-shaped, The electric excavator according to Claim 4.

7. The handle includes a straight portion extending laterally from the gear housing and a hand guard portion disposed below the straight portion, The electric excavator according to Claim 4.

8. The handle includes a bent portion that bends downward as it moves away from the gear housing and a straight portion that extends laterally from the gear housing below the bent portion, The electric excavator according to Claim 4.

9. Comprising a grounding member disposed below the rotary output portion, The electric excavator according to Claim 1.

10. At least a part of the grounding member is disposed laterally of the gear housing, The electric excavator according to Claim 9.

11. The grounding member is fixed to the gear housing, The electric excavator according to Claim 9.

12. A motor housing that houses a motor, A handle housing having a grip portion provided with a trigger switch for starting the motor; A gear housing for accommodating a speed reduction mechanism; A rotary output portion that protrudes forward from the gear housing and rotates by the rotational force of the motor transmitted through the speed reduction mechanism with a drill bit attached thereto; A grounding member disposed below the rotary output portion and at least a part of which is disposed laterally of the gear housing. An electric excavator comprising: Electric excavator

13. In a state where the motor housing is disposed above the gear housing, the grounding member is fixed to the gear housing. The electric excavator according to claim 12. The electric excavator according to claim 12.

14. In a state where the motor housing is disposed laterally of the gear housing, a handle disposed above the gear housing is provided. The handle is fixed to the gear housing. The grounding member is fixed to the handle housing. The electric excavator according to claim 12. The handle is fixed to the gear housing. The grounding member is fixed to the handle housing. The electric excavator according to claim 12.

Images