Electric work machine

Abstract

To easily and safely perform attachment / detachment work of a battery pack mounted on an electric work machine in an attachable / detachable manner.SOLUTION: An electric work machine (1) has: a machine body 4 including a travel device 2 and a work part 3; at least one motor (31 and 32) provided on the machine body 4 for driving the travel device 2 and / or the work part 3; a battery pack 43 for supplying power to at least the one motor (31 and 32); and a battery storage part 46 provided on the machine body 4 so as to store the battery pack 43 in an attachable / detachable manner. The battery storage part 46 defines a storage chamber 47 extending in a direction inclined in a direction transverse to a vertical direction so as to pull out the battery pack 43 obliquely upward in front view.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to an electric working machine, such as an electric snow blower, an electric lawn mower, an electric brush cutter, or an electric tiller. [Background technology]

[0002] There are known electric snow blowers and other working machines that have a detachable battery pack as a power source and that travel by driving drive wheels with an electric motor that receives power from the battery pack (see Patent Document 1). In this working machine, a box-shaped battery housing with an opening for inserting and removing the battery pack is located above the rear of the machine frame, which forms the skeleton of the machine. The battery housing has an opening facing rearward and a flat bottom that slopes upward toward the rear end. When the battery pack is stored in the battery housing, a handle is integrated into the rear wall, and by grasping this handle, the battery pack can be inserted and removed from the battery housing at an angle from the rear of the machine frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-4683 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the battery pack is heavy, and its handle extends from the rear of the work machine body, making it difficult to attach or detach the battery pack. Furthermore, if the work machine is not secured with a brake or other device, attaching or detaching the battery pack can cause the work machine to unintentionally move forward or backward.

[0005] In view of the above background, an object of the present invention is to make it easy and safe to attach and detach a battery pack that is detachably mounted on an electric working machine. [Means for solving the problem]

[0006] In order to solve such problems, one embodiment of the present invention is an electric work machine (1) having a body (4) equipped with a traveling device (2) and a working unit (3), at least one motor (31, 32) provided on the body for driving the traveling device and / or the working unit, a battery pack (43) for supplying power to the at least one motor, and a battery storage section (46) provided on the body for detachably storing the battery pack, wherein the battery storage section defines a storage chamber (47) extending in a direction inclined laterally relative to the vertical direction so that the battery pack can be removed diagonally upward when viewed from the front.

[0007] With this configuration, the user can easily attach and detach the battery pack by standing to the side of the machine on the side where the storage compartment is inclined and inserting and removing the battery pack at an angle into and from the battery storage section. Also, even if the work machine starts moving due to an incorrect operation when removing the battery pack, the user will not come into contact with the work machine because they are standing to the side of the machine.

[0008] Preferably, when the battery pack (43) is stored in the battery storage section (46), the upper part of the battery pack (43) is offset to one side relative to the lateral center (C2) of the electric working machine (1), and the lower part of the battery pack (43) is offset to the other side relative to the lateral center.

[0009] This configuration prevents the center of gravity of the battery pack from being significantly offset from the lateral center of the electric work machine when it is stored in the battery storage section, thereby preventing the center of gravity of the electric work machine from significantly changing in the lateral direction between when the battery pack is installed and when it is not installed, thereby increasing the lateral stability of the electric work machine.

[0010] Preferably, the battery pack (43) has a shape that is long in the direction of removal from the battery storage section, and a heavy object (42, 43) is placed in a space (S) formed below the one side surface of the battery pack.

[0011] According to this configuration, by placing a heavy object in a low space formed below one side of the battery pack, the center of gravity of the electric working machine is lowered, and the stability of the electric working machine is increased.

[0012] Preferably, the heavy load includes a fixed battery (42) mounted on the airframe (4) for powering a control device (44) that controls the power supply from the battery pack (43) to at least one of the motors (31, 32).

[0013] With this configuration, the heavy fixed battery can be placed in a low space formed below one side of the battery pack.

[0014] Preferably, the heavy object includes an electrical component (45) that generates heat when at least one of the motors (31, 32) is driven, and the electrical component is positioned opposite the one side of the battery pack (43).

[0015] With this configuration, the battery pack is warmed by the heat generated by the electrical components when the motor is running, so that the battery pack can stably supply power to at least one motor even when the electric work machine is used in cold climates.

[0016] Preferably, the electric work machine (1) further has an operating unit (5) provided at the rear of the machine body (4), the working unit (3) is arranged at the front of the machine body, and the battery pack (43) is arranged between the working unit and the operating unit.

[0017] With this configuration, the operating unit does not get in the way of the battery pack installation / removal work. Furthermore, when installing or removing the battery pack, the user does not need to stand in the direction of travel of the electric work machine relative to the working unit, allowing the installation / removal work to be performed safely.

[0018] Preferably, the traveling device (2) includes left and right endless tracks (6) arranged behind the working unit (3), each of the endless tracks having a sprocket wheel (7) arranged at the rear and driven by at least one of the motors (31), an idler wheel (8) arranged at the front, and a crawler belt (9) wound around the sprocket wheel and the idler wheel, and the battery pack (43) is arranged above the rotation axis of the idler wheel in a side view.

[0019] With this configuration, even if the working unit is located at the front of the machine body and the left and right tracks are located behind the working unit, the weight distribution between the front and rear of the electric work machine can be optimized, thereby improving the fore-and-aft stability of the electric work machine when the battery pack is installed.

[0020] Preferably, at least one of the motors includes a traveling motor (31) that drives the traveling device (2) and a working motor (32) that drives the working unit (3), and the traveling motor is arranged below the battery pack (43).

[0021] With this configuration, the heavy traction motor is positioned below the battery pack, lowering the center of gravity of the electric work machine, increasing its stability and optimizing the weight distribution between the front and rear of the electric work machine.

[0022] Preferably, the work motor (32) is disposed forward of the front end of the battery pack (43).

[0023] With this configuration, the heavy work motor is positioned forward of the battery pack, optimizing the front-to-rear weight distribution of the electric work machine, thereby improving the front-to-rear stability of the electric work machine when the battery pack is installed.

[0024] Preferably, the electric working machine is an electric snow blower (1), and the working part (3) includes an auger (11) that electrically removes snow.

[0025] This configuration allows for safe and easy battery pack installation and removal. Furthermore, by locating the electrical components that generate heat when the motor is running on one side of the battery pack, the battery pack can stably supply power to the motor of an electric snow blower used in cold climates. [Effects of the Invention]

[0026] According to the above configuration, the battery pack that is detachably mounted on the electric working machine can be easily and safely attached and detached. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a perspective view of a snow blower according to an embodiment; [Figure 2] Side view of a snow blower according to an embodiment [Figure 3] Rear view of the snow blower according to the embodiment [Figure 4] Vertical cross-sectional view of a snow blower according to an embodiment. [Figure 5] 1 is a perspective view of the main part of the machine body with the cover member open; [Figure 6] FIG. 1 is a perspective view of a snow blower showing a part of a cover member in perspective; [Figure 7] Cross-sectional view of a snow blower according to an embodiment DETAILED DESCRIPTION OF THE INVENTION

[0028] An electric snow blower according to the present invention (hereinafter simply referred to as snow blower 1) will be described below with reference to FIGS.

[0029] As shown in Figures 1 to 3, snow blower 1 according to this embodiment includes a body 4 equipped with a traveling device 2 and a working unit 3 (snow removal working unit), and an operating unit 5 provided at the rear of body 4. Snow blower 1 is a walk-behind snow blower configured so that a user walks behind body 4 while the traveling device 2 moves forward and the working unit 3 removes snow.

[0030] The traveling device 2 is composed of left and right endless tracks (crawlers) 6 arranged behind the working unit 3. Each of the endless tracks 6 has a sprocket wheel 7 which is a drive wheel arranged on the rear side, an idler wheel 8 which is an idler wheel arranged on the front side, and a crawler belt 9 which is wound around the sprocket wheel 7 and the idler wheel 8. The left and right endless tracks 6 are connected to each other by a frame unit 10 of the machine body 4.

[0031] The working unit 3 is located at the front of the machine body 4, protruding forward from the front of the frame unit 10. The working unit 3 includes an auger housing 11 that is open forward and downward, and an auger 12 that is rotatably housed within the auger housing 11 and crushes and collects snow. Left and right sleds 13 are mounted at the lower rear of the auger housing 11, and their heights are adjustable. The snow collected by the auger 12 is ejected by a blower 14 and thrown in the desired direction via a chute 15. A handle 16 for adjusting the snow throwing direction is mounted at the top of the chute 15.

[0032] The operation unit 5 includes an operation handle 17 extending rearward and upward from the rear of the frame unit 10, and an operation input unit 18 provided at the upper end of the operation handle 17. The operation handle 17 includes left and right arm units 19 and a connecting unit 20 connecting the left and right arm units 19 at a midpoint in the height direction. The tips of the left and right arm units 19 each extend rearward substantially horizontally and form grip units 19a to be held by the user. The operation input unit 18 is provided to connect the upper ends of the left and right arm units 19, and includes various switches that receive operation inputs for the traveling device 2 and the working unit 3.

[0033] Specifically, a main switch 21 is provided at the rear of the operation input unit 18. The main switch 21 is a key switch that can be operated with a key. A deadman's clutch 22 is provided above the left grip 19a. An auger switch 23, an auger speed adjustment lever 24, a travel speed adjustment lever 25, and a work light switch 26 are provided at the top of the operation input unit 18. A work light is also provided at the front of the operation input unit 18, and various indicators 27 that show the operating status of the auger 12, the operating status of the traveling device 2, the battery state of charge (SOC), etc. are provided on the upper rear surface of the operation input unit 18.

[0034] As shown in Figure 4, the frame portion 10 of the machine body 4 supports a travel motor 31 that drives the left and right sprocket wheels 7 of the traveling device 2, and a work motor 32 that drives the auger 12 and blower 14 of the work unit 3.

[0035] The travel motor 31 is a three-phase AC motor and is disposed at the bottom of the machine body 4 in a longitudinal position aligned with the left and right sprocket wheels 7. The output shaft 31a of the travel motor 31 extends downward and vertically and is connected to the left and right sprocket wheels 7 via a transmission 33.

[0036] The work motor 32 is a three-phase AC motor and is located under the machine body 4 at a longitudinal position aligned with the left and right idler wheels 8. The output shaft 32a of the work motor 32 extends forward and in the longitudinal direction, supports the blower 14, and is connected to the auger 12 via a worm gear 34. The work motor 32 bears a larger work load than the traveling load, and is therefore composed of a motor with higher output and heavier weight than the traveling motor 31.

[0037] The work motor 32 is located at the fore-and-aft center C1 of the snow blower 1. The fore-and-aft center C1 is the reference point for the front-to-rear weight distribution of the snow blower 1 and refers to the fore-and-aft center between the front and rear ends of the snow blower's 1 ground contact surface. The front ends of the snow blower's 1 ground contact surface are located at the left and right sleds 13 mounted on the auger housing 11, and the rear ends are directly below the rotation axis of the sprocket wheel 7 located at the rear. In other words, the fore-and-aft center C1 is located rearward of the sled 13 by half (L / 2) of the fore-and-aft distance L between the sled 13 and the rotation axis of the sprocket wheel 7. The center of gravity of the snow blower 1 should be located at the fore-and-aft center C1 with a margin of ±5% of the ground contact surface in a side view. In particular, the center of gravity of the snow blower 1 should be located substantially at the fore-and-aft center C1 of the ground contact surface in a side view.

[0038] A cover member 35 that houses the travel motor 31, the work motor 32, and various electrical components is supported on the frame section 10 of the machine body 4. The cover member 35 is disposed between the work unit 3 and the operation unit 5. An opening 36 is formed in the top of the cover member 35, and a lid member 37 for opening and closing the opening 36 is attached to the cover member 35 via a hinge 38 (see Figure 2).

[0039] As also shown in Figure 5, the cover member 37 is constantly biased in the opening direction by a biasing member such as a coil spring provided near the hinge 38, and is provided with a locking member 39 on the free end opposite the hinge 38. The locking member 39 is a seesaw-shaped member pivotally supported at its middle portion, and is attached to the cover member 37 so as to be swingable about an axis parallel to the hinge 38. The opening 36 of the cover member 35 is defined by an annular wall 40 rising from the top surface of the cover member 35, and a locking projection 41 that locks the locking member 39 is integrally formed on the outer surface of the annular wall 40 on the side opposite the hinge 38. When the user closes the cover member 37, the lower part of the locking member 39 engages with the locking projection 41, maintaining the cover member 37 in the closed position. When the user presses the upper part of the locking member 39 to release the locking by the locking projection 41, the lid member 37 is rotated in the opening direction by the biasing member and is maintained in the open position shown in FIG.

[0040] As shown in FIGS. 4 and 6, the cover member 35 accommodates a fixed battery 42 (FIG. 6) fixed to the frame 10 of the vehicle body 4, a battery pack 43 detachably mounted on the vehicle body 4, a control device 44 (FIG. 4) disposed below the battery pack 43, a PDU 45 (45A, 45B, Power Drive Unit, FIG. 6), and the like. The battery pack 43 is detachably housed in a battery storage section 46 provided in the vehicle body 4. The battery storage section 46 is disposed above the travel motor 31 and below the opening 36 of the cover member 35, and defines a storage chamber 47 that is open toward the opening 36 to allow the battery pack 43 to be inserted and removed. The fixed battery 42 is disposed on the lower right side of the battery storage section 46 and is fixed to the frame 10 of the vehicle body 4 via a bracket 48.

[0041] The PDU 45 includes a DC-AC converter and converts DC power output from the battery pack 43 into three-phase AC for driving the motor. The PDU 45 includes a travel PDU 45A connected to the battery pack 43 and the travel motor 31, and a work PDU 45B connected to the battery pack 43 and the work motor 32. The travel PDU 45A generates heat when the travel device 2 is driven, i.e., when power is supplied to the travel motor 31. The work PDU 45B generates heat when the working unit 3 is driven, i.e., when power is supplied to the work motor 32. The travel PDU 45A and work PDU 45B are attached to the right side of the battery storage section 46, above the fixed battery 42.

[0042] The control device 44 is an electronic control unit (ECU) made up of a microcomputer, ROM, RAM, peripheral circuits, input / output interfaces, drivers, etc. The control device 44 is connected to the fixed battery 42, switches, work lights, indicators 27, battery pack 43, and PDU 45 via communication lines. The control device 44 is started up by power supplied from the fixed battery 42 when the main switch 21 is turned on. After starting up, the control device 44 controls the operation of the working unit 3, traveling device 2, work lights, and indicators 27 based on signals from the deadman clutch 22, auger switch 23, auger speed adjustment lever 24, travel speed adjustment lever 25, and work light switch 26.

[0043] Specifically, when the deadman clutch 22 is gripped together with the left grip portion 19a, the control device 44 allows the supply of power from the battery pack 43 to the traveling motor 31 and the work motor 32. When the deadman clutch 22 is released, the control device 44 stops the supply of power to the traveling motor 31 and the work motor 32. The control device 44 controls the rotational speed of the traveling motor 31, i.e., the travel speed of the snow blower 1, by using the current output from the battery pack 43 to the travel PDU 45A, depending on the operating position of the travel speed adjustment lever 25. The control device 44 switches the start and stop of the work unit 3 by turning the auger switch 23 on and off. The control device 44 controls the rotational speed of the work motor 32, i.e., the rotational speed of the auger 12, by using the current output from the battery pack 43 to the work PDU 45B, depending on the operating position of the auger speed adjustment lever 24.

[0044] 4 and 5, the battery pack 43 has a rectangular parallelepiped shape that is long in the vertical direction, and is provided with a handle 49 at its upper end. A power supply terminal is provided at the lower end of the battery pack 43 for connection to the control device 44 and PDU 45. As shown in FIG. 4, a power receiving connector 50 that can be connected to the power supply terminal of the battery pack 43 is provided on the bottom surface of the battery storage section 46. The battery pack 43 is located behind the rear end of the work motor 32 and above the upper end, above the travel motor 31.

[0045] The storage chamber 47 of the battery storage unit 46 extends upward from the bottom surface of the battery storage unit 46 toward the opening 36. A user can attach the battery pack 43 to the battery storage unit 46 by grasping the handle 49 of the battery pack 43, moving the battery pack 43 from above the opening 36 downward, and inserting it into the storage chamber 47. A user can also remove the battery pack 43 from the battery storage unit 46 by grasping the handle 49 of the stored battery pack 43, moving the battery pack 43 upward, and pulling it out of the storage chamber 47.

[0046] As shown in Fig. 7, the storage chamber 47 defined by the battery storage section 46 extends in a direction inclined to the right relative to the vertical direction so that the battery pack 43 can be removed diagonally upward when viewed from the front. Therefore, a user can easily attach or remove the battery pack 43 by standing on the right side of the machine body 4, where the storage chamber 47 is inclined, and inserting or removing the battery pack 43 at an angle relative to the battery storage section 46. The inclination angle θ of the storage chamber 47 is preferably 10° to 30°, more preferably 10° to 20°, and most preferably 15°. Furthermore, even if the snow blower 1 starts moving due to an erroneous operation when removing the battery pack 43, the user will not come into contact with the snow blower 1 because they are standing to the side of the machine body 4.

[0047] When stored in the battery storage section 46, the battery pack 43 is offset to the right at its upper part with respect to the lateral center C2 of the snow blower 1, and offset to the left at its lower part with respect to the lateral center C2. The lateral center C2 is defined as the lateral center of the ground contact surface (load support portion) of the snow blower 1, or the center between the left and right ends of the ground contact surface. In other words, the battery pack 43 is positioned so that its center of gravity is located at the lateral center C2 in a front view. In reality, the center of gravity of the battery pack 43 is located at the midpoint of the ground contact surface with a margin of approximately ±5% in a front view. More preferably, the center of gravity of the snow blower 1 is located approximately in the center of the ground contact surface in a front view.

[0048] Mounting battery pack 43 in this manner prevents the center of gravity of battery pack 43 when stored in battery storage section 46 from being significantly offset from lateral center C2 of snow blower 1. This prevents the center of gravity of snow blower 1 from changing significantly in the lateral direction between when battery pack 43 is mounted and when battery pack 43 is not mounted, increasing the lateral stability of snow blower 1.

[0049] As described above, the battery pack 43 has a shape that is long in the vertical direction, which is the direction in which the battery pack 43 is removed. Therefore, as shown in Figures 6 and 7, a space S is formed below the right side of the battery pack 43. The fixed battery 42, which is a heavy object, is placed in the lower part of this space S. By placing a heavy object in the low space S formed below the right side of the battery pack 43 in this way, the center of gravity of the snow blower 1 is lowered, and the stability of the snow blower 1 is increased.

[0050] The heavy objects, the travel PDU 45A and the work PDU 45B, are disposed above the space S formed below and to the right of the battery pack 43. The travel PDU 45A and the work PDU 45B are disposed above the fixed battery 42 in positions facing the right side of the battery pack 43, and are supported by the battery storage section 46. By disposing the travel PDU 45A and the work PDU 45B in such positions, the battery pack 43 is warmed by the heat generated by the travel PDU 45A when the travel motor 31 is driven, and the heat generated by the work PDU 45B when the work motor 32 is driven. Therefore, even when the snow blower 1 is used in cold regions, a stable power supply is provided from the battery pack 43 to the travel motor 31 and the work motor 32.

[0051] 4, the battery pack 43 is disposed between the operation unit 5 provided at the rear of the body 4 and the working unit 3 located at the front of the body 4. Therefore, the operation unit 5 does not get in the way of attaching or detaching the battery pack 43. Furthermore, when attaching or detaching the battery pack 43, the user does not need to stand in the direction of travel of the snow blower 1 relative to the working unit 3, allowing for safe attachment and detachment.

[0052] The battery pack 43 is a part of the endless track 6 in a side view. sprocket wheel 7The battery pack 43 is disposed above the rotation axis of the snow blower 1. In other words, the battery pack 43 is disposed behind the center C1 of the snow blower 1 in the fore-and-aft direction. Therefore, even if the working unit 3 is disposed at the front of the body 4 and the left and right tracks 6 are disposed behind the working unit 3, the weight distribution between the front and rear of the snow blower 1 can be optimized (for example, 50% ± 5%). This improves the stability of the snow blower 1 in the fore-and-aft direction when the battery pack 43 is installed.

[0053] As described above, the battery storage section 46 is located above the travel motor 31, and the battery pack 43 is located behind the center C1 of the snow blower 1 in the front-to-rear direction. In other words, the travel motor 31 is located below the battery pack 43 and behind the center C1 of the snow blower 1 in the front-to-rear direction. By locating the travel motor 31, which is a heavy object, in this position, the center of gravity of the snow blower 1 is lowered, the stability of the snow blower 1 is increased, and the weight distribution between the front and rear of the snow blower 1 is optimized.

[0054] The work motor 32 is positioned forward of the front end of the battery pack 43. By positioning the work motor 32, which is a heavy object, forward of the battery pack 43 in this way, the front-to-rear weight distribution of the snow blower 1 is optimized, thereby improving the front-to-rear stability of the snow blower 1 when the battery pack 43 is installed.

[0055] The snow blower 1 includes an auger 12 in the working section 3 that electrically removes snow. This allows for easy and safe attachment and detachment of the battery pack 43. Furthermore, because the travel PDU 45A and the work PDU 45B are located opposite the right side of the battery pack 43, a stable supply of power from the battery pack 43 to the travel motor 31 and work motor 32 of the snow blower 1 used in cold climates is ensured.

[0056] This concludes the description of the specific embodiment, but the present invention is not limited to the above embodiment and can be widely modified and implemented. In the above embodiment, the snow blower 1 is equipped with one travel motor 31, but the number of travel motors 31 is arbitrary; for example, two travel motors 31 may be provided separately for the left and right caterpillars 6. The snow blower 1 is equipped with both a travel motor 31 and a work motor 32, but it may also be equipped with only one of the travel motor 31 and the work motor 32. The work unit 3 is equipped with an auger 12, but it may also be equipped with a snow removal plate instead of the auger 12. In the above embodiment, the snow blower 1 is equipped with an operation unit 5, but instead of having the operation unit 5, it may be operated autonomously or remotely.

[0057] In the above embodiment, the present invention is applied to a snow blower 1, but the present invention can also be applied to lawn mowers, brush cutters, and tillers. When the present invention is applied to a lawn mower or brush cutter, a lawn mowing or brush cutter with a blade attached to the bottom of the machine body 4 is provided instead of the snow removal working unit, and when applied to a tiller, cultivating tines suitable for tilling can be provided instead of the auger 12. [Explanation of symbols]

[0058] 1: Snow blower 2: Running gear 3: Working section 4: Aircraft 5:Operation section 6: endless track 7: Sprocket wheel 8: Idler wheel 9: Crawler belt 10: Frame section 12: Ogre 31:Traction motor 32: Working motor 42: Fixed battery (heavy) 43: Battery pack 44: Control device 45: PDU (electrical components, heavy items) 45A: Running PDU 45B: Work PDU 46: Battery compartment 47: Storage room C2: Lateral center S: Space

Claims

1. An electric work machine, a machine body equipped with a running device and a working unit; at least one motor provided on the machine body for driving the traveling device and / or the working unit; a battery pack for powering the at least one motor; a battery storage section provided on the aircraft body for detachably storing the battery pack; the battery storage section defines a storage chamber extending in a direction inclined laterally with respect to a vertical direction so that the battery pack can be removed obliquely upward in a front view; When the battery pack is stored in the battery storage section, an upper portion of the battery pack is offset to one side with respect to the lateral center of the electric working machine, and a lower portion of the battery pack is offset to the other side with respect to the lateral center, the battery pack has a shape that is long in a direction in which the battery pack is removed from the battery storage section, and a heavy object is placed in a space formed below the one side surface of the battery pack, An electric work machine, characterized in that the heavy object includes a fixed battery provided on the machine body for activating a control device that controls the supply of power from the battery pack to at least one of the motors.

2. The electric work machine according to claim 1, characterized in that the heavy object includes an electrical component that generates heat when at least one of the motors is driven, and the electrical component is positioned opposite the one side of the battery pack.

3. The electric work machine according to claim 1 or claim 2, characterized in that the electric work machine further has an operating unit provided at the rear of the machine body, the working unit being arranged at the front of the machine body, and the battery pack being arranged between the working unit and the operating unit.

4. The traveling device includes left and right endless tracks arranged at the rear of the working unit, each of the endless tracks having a sprocket wheel arranged at the rear and driven by at least one of the motors, an idler wheel arranged at the front, and a crawler belt wound around the sprocket wheel and the idler wheel, 4. The electric operating machine according to claim 3, wherein the battery pack is disposed above the rotation axis of the sprocket wheel in a side view.

5. 5. The electric work machine according to claim 4, wherein at least one of the motors includes a travel motor that drives the traveling device and a work motor that drives the work unit, and the travel motor is disposed below the battery pack.

6. 6. The electric work machine according to claim 5, wherein the work motor is disposed forward of a front end of the battery pack.

7. 7. The electric working machine according to claim 1, wherein the electric working machine is an electric snow blower, and the working part includes an auger that electrically performs snow removal work.

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