JP2009022173A - Walking-type electric working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walking-type electric working machine which can efficiently release the heat of an electric motor and the heat of a battery. <P>SOLUTION: The walking-type electric working machine includes a tilling tine 2 or a travel device mounted under a transmission case 1; a steering handle 4 backward extended from the transmission case 1; an electric motor 3 disposed in the upper portion of the transmission case 1 for driving the tilling tine 2 or the travel device; and a battery 9 disposed in the outer peripheral portion under the electric motor 3, wherein the electric motor is constituted by the drive on a vertical shaft and a cooling fan 3d for downward supplying cooling air is disposed above the electric motor 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a walking electric work machine that drives a tilling claw or a traveling device attached to a lower part of a transmission case by an electric motor.

  As a conventional technique, for example, as disclosed in Patent Document 1, a battery (31 in FIG. 5 of Patent Document 1) is provided on the outer peripheral portion of an electric motor (11 in FIG. 5 of Patent Document 1). There is known a walking type electric working machine configured to drive an electric motor to rotate a tilling claw (13 of FIG. 1 of Patent Document 1) provided at a lower portion of the machine body (17 of FIG. 5 of Patent Document 1). It has been.

Japanese Patent Laying-Open No. 2004-275102 (see FIGS. 1 and 5)

  In the walking type electric working machine of Patent Document 1, an electric motor (11 in FIG. 5 of Patent Document 1) for rotating a tilling claw is attached to a fender (14 in FIG. 5 of Patent Document 1), and an upper cover (Patent) It was configured to cover with 15) of FIG. 5 of Document 1, and the heat of the electric motor generated by rotating the tillage claw stayed in the upper cover and the fender and was not easily radiated. As a result, there is a problem that if the electric motor is driven for a long time, the electric motor is likely to break down and it is impossible to perform long-time tillage work, and if the electric motor is rotated at a high temperature, an excessive load is applied to the electric motor. There was a problem that the life of the electric motor was shortened.

In the walking type electric working machine of Patent Document 1, a battery (31 in FIG. 5 of Patent Document 1) is disposed on the outer periphery of the electric motor and covered with an upper cover (15 in FIG. 5 of Patent Document 1) from above. Thus, the heat of the battery generated by driving the electric motor stays in the upper cover and the fender and is not easily radiated. As a result, if the battery is used for a long time, the battery will be easily discharged and it will not be possible to perform long tillage work. If the battery is used at a high temperature, the battery will be overloaded and the battery life will be shortened. There was a problem.
An object of this invention is to implement | achieve the walk type electric working machine which can thermally radiate the heat | fever of an electric motor and a battery efficiently.

[I]
(Constitution)
The first feature of the present invention is that the walking type electric working machine is configured as follows.
A tilling claw or traveling device mounted on the lower part of the transmission case, a steering handle extending rearward from the transmission case, and an electric motor for driving the tilling claw or traveling device disposed on the upper part of the transmission case; A battery disposed on the outer periphery of the lower part of the electric motor,
While configuring the electric motor to drive the vertical axis,
A cooling fan for supplying cooling air downward is provided at the top of the electric motor.

(Function)
According to the first aspect of the present invention, when the cooling fan provided on the upper part of the electric motor is rotated, the cooling air from the cooling fan passes through the outer peripheral part of the electric motor and is disposed on the outer peripheral part of the lower part of the electric motor. The surface of the electric motor and the surface of the battery can be cooled by the cooling air from the cooling fan. As a result, it is possible to efficiently dissipate the heat of the electric motor and the battery generated by driving the tilling claws attached to the lower part of the transmission case or the traveling device, and to suppress the temperature rise due to the heat generation of the electric motor and the battery.

(The invention's effect)
According to the 1st characteristic of this invention, while being able to perform long-time tillage work, the lifetime of an electric motor and a battery can be ensured long.

[II]
(Constitution)
The second feature of the present invention lies in the following configuration in the walking type electric working machine of the first feature of the present invention.
A plurality of vertically long heat radiating plates are provided on the outer peripheral surface of the electric motor.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
According to the second feature of the present invention, when the cooling fan provided on the upper portion of the electric motor is rotated, the cooling air from the cooling fan is guided to the plurality of heat radiating plates provided on the outer peripheral surface of the electric motor. It is supplied downward through the space between the heat sinks, and the cooling air from the cooling fan is easily supplied to the battery. Since the surface area of the outer peripheral portion of the electric motor is widely secured by the plurality of vertically long heat radiating plates, heat is easily radiated from the outer peripheral portion of the electric motor by the cooling air from the cooling fan. As a result, the heat of the electric motor and the battery can be radiated more efficiently, and the temperature rise due to the heat generation of the electric motor and the battery can be further suppressed.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second feature of the present invention, it is possible to perform the tilling work for a longer time and to further ensure the life of the electric motor and the battery.

[Overall configuration of walking type electric work machine]
As shown in FIGS. 1 and 2, the tilling claw 2 pivotally supported by the transmission case 1 is rotated by an electric motor 3 disposed on the upper portion of the transmission case 1 so as to extend obliquely rearward and upward from the transmission case 1. The walking type electric working machine is configured so that the tilling work can be performed while traveling by operating the operated steering handle 4.

  Upper and lower connecting portions 1b, 1c having left and right connecting holes are integrally formed at the upper rear portion and the lower rear portion of the transmission case 1, and a pipe-like frame 5 is formed on the upper and lower connecting portions 1b, 1c. Are connected obliquely rearward and upward. A slide member 6 is attached to the rear end portion of the frame 5 so as to be slidable in the longitudinal direction with respect to the frame 5, and the steering handle 4 is fixed to the slide member 6. The steering handle 4 is made of a pipe material, and a left and right central portion of a front end portion thereof is fixed to the slide member 6.

  Left and right grips 4a are attached to the rear ends of the left and right control handles 4, and the left and right grips 4a are gripped with the left and right hands, and the tillage work is carried out by rotating the tillage claws 2 for traveling. It can be carried out. A start / stop switch 7 is mounted in front of the grip portion 4a attached to the right steering handle 4, and the start / stop switch 7 is operated with the thumb of the right hand by grasping the grip portion 4a of the control handle 4. The electric motor 3 to be described later can be started and stopped, and the tilling claw 2 can be rotated and stopped.

  The slide member 6 is equipped with a long hole and a lock. The height of the grip portion 4a of the steering handle 4 is changed by releasing the lock and moving the slide member 6 along the long hole. It is configured to be adjustable.

  The frame 5 is equipped with a hitch 11, and a resistance rod 12 is supported on the hitch 11 so that the height can be adjusted. At the top of the transmission case 1, there are a lower cover 20, an electric motor 3 having a cooling fan 3d, a battery unit 30 in which a plurality of batteries 31 serving as a drive source for the electric motor 3 are stacked, a control box 23, a protective cover 40, and the like. It is installed.

[Transmission structure of walking electric work machine]
As shown in FIG. 3, a rotating shaft 13 is rotatably supported around a left and right axis P <b> 1 at a lower portion of the transmission case 1, and tilling claws 2 are attached to both left and right ends of the rotating shaft 13. . Inside the transmission case 1, a vertically long drive shaft 15 is supported so as to be rotatable around a vertical axis P2 via upper and lower bearings 14 and 14 fitted in the transmission case 1. The upper end portion of the drive shaft 15 is interlocked and connected to the output shaft 3 a of the electric motor 3 via a coupling 16.

  A drive gear 17 in which a spiral gear is machined is interlocked and connected to the lower portion of the drive shaft 15, and this drive gear 17 is engaged with a rotary gear 18 that is interlocked and connected to the rotary shaft 13. The rotation around the axis P2 in the vertical direction is reduced and transmitted to the rotation around the axis P1 in the left-right direction of the rotary shaft 13.

  The rotary shaft 13 is disposed behind the drive shaft 15 so that the horizontal axis P1 of the rotary shaft 13 is positioned behind the vertical axis P2 of the drive shaft 15. The electric motor 3 or the like connected to the upper portion can be positioned forward with respect to the rotating shaft 13, and the weight of the electric motor 3 or the like can be caused to act on the front side with respect to the rotating shaft 13. As a result, the counterclockwise bending moment around the horizontal axis P1 shown in FIG. 1 can be applied by the weight of the electric motor 3 and the like, and the operability of the steering handle 4 can be improved, and the tilling claw 2 The power of tilling can be improved.

  A flat deck portion 1a for fixing the electric motor 3 and the like is formed on the upper portion of the transmission case 1, and the electric motor 3 and the lower cover 20 are fixed to the deck portion 1a.

  As shown in FIGS. 3 and 4, the electric motor 3 includes a flange portion 3b positioned at the lower portion thereof and an electric motor main body 3c, and a spline groove is processed below the flange portion 3b. The output shaft 3a is extended. A plurality of mounting holes are formed in the flange portion 3b. By tightening the lower surface of the flange portion 3b to the upper surface side of the deck portion 1a of the transmission case 1 with the horizontal member 21 of the lower cover 20 interposed therebetween, The electric motor 3 is configured to be fixed to the transmission case 1.

  A cooling fan 3d that is linked to the electric motor 3 and that can rotate integrally with the electric motor 3 is attached to the upper portion of the electric motor 3 so as to be rotatable about a vertical axis P2. Is rotated so that the air sucked from the upper part and the outer periphery of the cooling fan 3d can be supplied to the electric motor main body 3c and the like located below the cooling fan 3d. The upper and outer peripheral portions of the cooling fan 3d are covered with a fan cover (not shown) in which a plurality of ventilation holes are formed.

  A plurality of radially projecting heat radiating plates 3 f are formed on the outer peripheral portion of the electric motor 3, and by ensuring a large surface area of the outer peripheral portion of the electric motor 3 with the heat radiating plates 3 f, heat from the electric motor 3 is obtained. Is configured to efficiently dissipate heat. The heat radiating plate 3f is integrally cast on the outer peripheral portion of the electric motor main body 3c, and is formed into a vertically long strip plate shape.

[Detailed structure of lower cover]
As shown in FIGS. 3 to 5, a lower cover 20 is fastened and fixed to the deck portion 1 a of the transmission case 1 from above. The lower cover 20 is made of sheet metal, and includes a horizontal member 21 that is fastened and fixed to the upper surface side of the deck portion 1a of the transmission case 1, and an inclined member 22 that extends obliquely rearward and upward from the rear end portion of the horizontal member 21. It is prepared for. Openings 21 a are formed in the front and rear and the left and right central portions of the horizontal member 21, and the output shaft 3 a of the electric motor 3 is provided in the openings 21 a with the lower cover 20 attached to the deck portion 1 a of the transmission case 1. The electric motor 3 can be fixed to the upper surface side of the lower cover 20 by tightening and fixing the electric motor 3 from above.

  A contact portion 22a bent forward is formed at the upper end portion of the inclined member 22 in the lower cover 20, and bent portions 22b bent forward are formed on the left and right sides of the inclined member 22 of the lower cover 20. A block-shaped fixing member 25 is fixed to the upper surface side of the left and right sides of the lower cover 20. The rear part of the protective cover 40 is brought into contact with the contact part 22a and the left and right bent parts 22b from above and from the side, and is fixed by tightening, and the right and left side parts of the protective cover 40 are brought into contact with the fixing member 25 from the side and tightened. The protective cover 40 can be fixed to the lower cover 20 by being fixed.

  A control box 23 formed in a box shape is fastened and fixed to the upper surface side of the inclined member 22 in the lower cover 20, and a control device (not shown) for controlling the electric motor 3 and the like inside the control box 23. ) And a control device (not shown) such as a control relay. A connection port 23a is formed in the control box 23, and wiring from the connection port 23a to the electric motor 3 and the like can be performed.

  The control box 23 is formed in a box shape by forming a steel plate into a sheet metal. By directly fixing the lower surface side of the control box 23 to the inclined member 22, the heat generated in the control box 23 is controlled by the control box 23. The heat is transmitted from the lower surface side of 23 to the outside air via the inclined member 22 so that the heat of the control box 23 can be efficiently radiated.

  Left and right lower exhaust ports 20A opened downward are formed on the left and right sides of the rear portion of the horizontal member 21 in the lower cover 20, and the left and right sides of the rear portion of the inclined member 22 in the lower cover 20 are rearward. Opened left and right upper exhaust ports 20B are formed. The wind sucked into the protective cover 40 by the cooling fan 3d cools the electric motor 3, the battery unit 30, the control box 23, etc., and is discharged from the lower and upper exhaust ports 20A and 20B. ing. The lower, upper exhaust ports 20A, 20B may have different positions, quantities, shapes, etc., for example, by configuring the lower and upper exhaust ports 20A, 20B in a mesh shape (not shown). Intrusion of foreign matter from the outside can be prevented.

  A front guide member 24 that guides the wind from the cooling fan 3d mounted on the upper portion of the electric motor 3 backward is fixed to the upper surface side of the front central portion of the horizontal member 21 in the lower cover 20. The front guide member 24 is formed in a shape that is bent in an inverted letter shape that is symmetrical in plan view, and the height from the upper surface of the horizontal member 21 is approximately the same as the height of the battery 31 that is stacked in two stages. It is set to be the same height.

  By configuring the front guide member 24 in this way, the wind supplied from above by the cooling fan 3d is changed in direction by the front guide member 24 and provided on the left and right sides of the rear portion of the horizontal member 21. It can guide toward the lower exhaust port 20A. The shape (angle) and the mounting position of the front guide member 24 are such that the wind changed in direction by the front guide member 24 easily passes through the position of the battery 31 and is supplied to the lower exhaust port 20A. It is set to a position where it can be easily supplied to the upper exhaust port 20B. As a result, while the wind from the cooling fan 3d is supplied to the battery 31 and the control box 23, the wind that has absorbed the heat of the battery 31 and the control box 23 can be guided to the lower and upper exhaust ports 20A and 20B, and efficiently. The battery 31 and the control box 23 can be cooled, and the air warmed by the battery 31 and the control box 23 can be efficiently exhausted from the lower and upper exhaust ports 20A and 20B.

[Detailed structure of battery unit]
As shown in FIGS. 3 and 4, battery units 30 arranged at symmetrical positions are fastened and fixed to the upper surface side of the horizontal member 21 at the left and right sides of the electric motor 3. In a state where the protective cover 40 is attached to the lower cover 20, the battery unit 30 is mounted so that a predetermined gap is formed between the battery unit 30 and the protective cover 40 and between the battery unit 30 and the electric motor 3. It is arranged so that the wind from the cooling fan 3d can pass through the outer periphery of the battery unit 30 without difficulty.

  As shown in FIGS. 5 to 7, the battery unit 30 is arranged in a substantially left-right symmetrical position with a predetermined gap between the left and right sides of the electric motor 3 in plan view. The front and rear intermediate positions 30 are arranged so as to be substantially the same as the position of the axis P2 of the electric motor 3 in the front-rear direction.

  The left and right battery units 30 are configured so that the upper and lower batteries 31 can be connected to each other by an upper connecting member 32, a lower connecting member 33, an intermediate member 34 and a connecting bolt 35 and fixed to the upper surface side of the horizontal member 21 of the lower cover 20. Has been. The upper and lower connecting members 32, 33 are made of resin, and through holes 32 a, 33 a communicating vertically with the left and right central portion 43 are formed. At the upper part of the upper connecting member 32 and the lower part of the lower connecting member 33, contact portions 32b and 33b extending to the battery 31 side are formed, and the lower part of the upper connecting member 32 and the upper part of the lower connecting member 33 are formed. Are formed with recessed portions 32 c and 33 c that engage with the intermediate member 34.

  The lower connecting member 33 is formed in the same shape as the upper connecting member 32, and is configured to reduce the manufacturing cost by sharing parts.

  The intermediate member 34 is made of a resin and is formed in a plate shape that is long to the left and right, and is formed with a through hole 34 a that communicates vertically and a contact portion 34 b that extends to the battery 31 side. The intermediate member 34 is formed with a protruding portion 34c protruding upward and downward, and the protruding portion 34c engages with the recessed portions 32c and 33c of the upper and lower connecting members 32 and 33, so that the upper and lower portions are The connecting members 32 and 33 and the intermediate member 34 can be positioned, and can be prevented from being displaced from each other.

  With the contact portion 34b of the intermediate member 34 sandwiched between the upper and lower batteries 31, the upper and lower connecting members 32, 33 are attached from above and below, and the upper connecting member 32, the intermediate member 34, and the lower connection are attached from above. The battery unit 30 can be fixed to the lower cover 20 by inserting and inserting the connecting bolt 35 over the member 33 and fastening the connecting bolt 35 to the horizontal member 21 of the lower cover 20.

  By the contact portions 33b and 34b formed on the lower connecting member 33 and the intermediate member 34, the lower surface side of the lower battery 31 and the lower portion are provided between the lower surface side of the upper battery 31 and the upper surface side of the upper battery 31. A predetermined gap (a space opened in the front-rear and left-right directions for allowing the air to pass) is formed between the upper surface side of the horizontal member 21 in the cover 20, and the contact portions 33 b, By allowing the wind from the cooling fan 3d to pass through the gap formed by 34b, it is possible to secure a large surface area of the battery 31 that touches the wind and not only efficiently cool the battery 31, but also the surroundings of the battery 31 due to the heat generated by the battery 31. Condensation can be prevented.

[Detailed structure of protective cover]
As shown in FIGS. 1 and 2, the battery unit 30 and the like connected to the electric motor 3 and the battery 31 are covered compactly with a protective cover 40 from above so that these devices are not exposed to the outside and can be prevented from being damaged. The walk-type electric work machine is configured to improve the appearance.

  As shown in FIG. 1, FIG. 2, FIG. 8, and FIG. 9, the protective cover 40 is formed by blow molding resin, so that the electric motor 3, the control box 23, the battery unit 30, etc. Is formed into a shape that can be covered from above. The protective cover 40 includes a left portion 41 and a right portion 42 that cover the electric motor 3 and the like from both left and right sides, and a central portion 43 that is located between the left portion 41 and the right portion 42 and is shaped to protrude upward. It is configured with.

  The shape of the central portion 43 of the protective cover 40 in a side view is formed into a shape that is round and curved in the front-rear direction. The electric motor 3 and the battery unit that are compactly arranged on the upper portion of the lower cover 20 by the protective cover 40. 30 etc. can be covered.

  A cooling air introduction portion 44 is formed on the upper portion of the central portion 43 so as to protrude upward, and the shape of the cooling air introduction portion 44 in the rear view opened rearward at the rear portion of the cooling air introduction portion 44 is a horizontally long intake. A mouth 40A is formed. In this way, by forming the cooling air introduction portion 44, it is possible to stably suck in the wind from the rear of the cooling air introduction portion 44 that is not easily affected by the running of the walking electric work machine. The intake port 40A may have a different position, quantity, shape, and the like. For example, by configuring the intake port 40 in a mesh shape (not shown), it is possible to prevent foreign matter from being sucked in from outside air.

  An upper guide member 46 is mounted on the lower side of the cooling air introduction portion 44. The upper guide member 46 includes a cylindrical member 46a that is formed in a vertically-oriented cylindrical shape, and a conical guide member 46b that is fixed to the outer periphery of the upper portion of the cylindrical member 46a. The outer peripheral part of 46b is being fixed to the lower surface side of the cooling wind introduction part 44 over the perimeter. The cylindrical member 46 a of the upper guide member 46 is disposed concentrically with a predetermined gap in the radial direction from the outer peripheral surface of the electric motor 3, and is sucked from the intake port 40 </ b> A located at the rear portion of the upper guide member 46. The wind is guided downward by the guide member 46 b of the upper guide member 46, and can be efficiently supplied to the outer peripheral portion of the electric motor 3 by the cylindrical member 46 a of the upper guide member 46.

[Flow of cooling air in the protective cover]
As shown in FIGS. 8 and 9, by rotating the cooling fan 3 d, the outside air sucked from the intake port 40 </ b> A is guided by the upper guide member 46 and supplied to the outer peripheral portion of the electric motor 3. And the external air from the cooling fan 3d is supplied to the heat sink 3f provided in the outer peripheral part of the electric motor 3, and the electric motor 3 is cooled.

  As shown in FIG. 8, a part of the outside air guided downward by the upper guide member 46 is guided toward the front guide member 24 mounted on the front portion of the lower cover 20, and this front guide member. After the direction is changed rearward by 24, the battery unit 30 is supplied to the left and right sides of the electric motor 3. Then, the battery 31 is cooled by being supplied backward through the gap formed in the battery unit 30.

  As shown in FIG. 9, a part of the outside air guided downward by the upper guide member 46 is supplied to the battery units 30 disposed on both the left and right sides of the electric motor 3, and a gap formed in the battery unit 30. Through the lower exhaust ports 20A provided on the left and right side portions of the rear portion of the horizontal member 21 of the lower cover 20 while riding on the flow of the wind supplied to the left and right sides through the front guide member 24 described above. Exhausted.

  As shown in FIG. 8, a part of the outside air guided downward by the upper guide member 46 is supplied to the control box 23 disposed on the inclined member 22 of the lower cover 20 to cool the upper surface side of the control box 23. To do. The air that has cooled the control box 23 is exhausted from the left and right upper exhaust ports 20 </ b> B formed on the left and right sides of the inclined member 22.

  As shown in FIGS. 8 and 9, the outside air sucked from the intake port 40 </ b> A is supplied to the electric motor 3, the battery 31 and the control box 23, and is warmed by the electric motor 3, the battery 31 and the control box 23. The air is configured to be exhausted without difficulty from the lower exhaust port 20A and the upper exhaust port 20B, and is configured to allow the outside air to pass through the protective cover 40 efficiently.

  As described above, the electric motor 3, the battery 31, and the control box 23 are cooled by the outside air sucked from the intake port 40 </ b> A formed in the protective cover 40, and a plurality of exhaust ports (upper exhaust port 20 </ b> A) formed in the lower cover 20. , The lower exhaust port 20B) is configured so as to exhaust air from the lower exhaust port 20B), so that the heat generated from the electric motor 3, the battery 31 and the control box 23 inside the protective cover 40 is removed. Therefore, the electric motor 3, the battery 31 and the control box 23 can be efficiently cooled.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the example in which the cooling fan 3d that can rotate integrally with the electric motor 3 is provided on the electric motor 3, but is different from the electric motor 3. A cooling fan (not shown) driven by a small motor is provided at the top of the electric motor 3, and the motor of this cooling fan is connected to the control box 23. For example, according to the outside air temperature, the temperature in the protective cover 40, or the like. The rotation of the cooling fan may be controlled. Specifically, for example, by controlling the cooling fan to rotate without rotating the electric motor 3, the cooling fan can be rotated for a long time, and the electric motor 3 and the like can be effectively cooled.

  In the above-mentioned [Best Mode for Carrying Out the Invention], an example is shown in which the radial heat sink 3f is integrally formed on the outer peripheral surface of the electric motor 3, but the direction in which the heat sink 3e faces is different. For example, by disposing the heat radiating plate 3f in the front-rear direction, the wind from the cooling fan 3d can be efficiently guided forward or backward, and by disposing the heat radiating plate 3f in the left-right direction, The wind from the cooling fan 3d can be efficiently guided to the right or left. Moreover, you may employ | adopt the structure which fixes the heat sink 3f manufactured as another member to the outer peripheral surface of the electric motor 3. FIG.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Another Mode of Carrying Out the Invention], the walking type electric working machine having the tilling claw 2 attached to the lower part of the transmission case 1 is shown as an example. The present invention can be similarly applied to a walking type electric working machine in which a traveling device such as a crawler traveling device (not shown) is attached to the lower part of the transmission case 1.

Overall left side view of walking type electric work machine Overall plan view of walking electric work machine Longitudinal left side view of walking electric work machine Cross-sectional plan view of walking electric work machine The perspective view which shows the structure inside a protective cover Side view showing the structure of the battery unit Perspective view showing structure of battery unit Longitudinal side view showing the structure of the protective cover and the flow of cooling air Longitudinal front view showing the structure of the protective cover and the flow of cooling air

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission case 1b Heat sink 2 Tillage claw 3 Electric motor 3d Cooling fan 3f Heat sink 4 Steering handle 9 Battery

Claims (2)

A tilling claw or traveling device mounted on the lower part of the transmission case, a steering handle extending rearward from the transmission case, and an electric motor for driving the tilling claw or traveling device disposed on the upper part of the transmission case; A battery disposed on the outer periphery of the lower part of the electric motor,
While configuring the electric motor to drive the vertical axis,
A walking type electric working machine provided with a cooling fan for supplying cooling air downward to the upper part of the electric motor.   The walking electric work machine according to claim 1, wherein a plurality of vertically long heat sinks are provided on an outer peripheral surface of the electric motor.

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