Electric excavator

Abstract

To provide an electric shovel which can suppress heating of a battery due to transmission of heat from a hydraulic apparatus.SOLUTION: An external cover 9 has: a left side plate 9L and a right side plate 9R facing each other in a lateral direction; a vent hole VL provided on the left side plate 9L; and a vent hole VR provided on the right side plate 9R. A battery 31 is arranged between the left side plate 9L and the right side plate 9R, and supplies power to the electric motor. Hydraulic apparatuses 32 and 33 are arranged in front of the battery 31. A cooling device 40 has a cooling fan 40a, and is arranged so as to face a region sandwiched between the battery 31 and the hydraulic apparatuses 32 and 33 in the lateral direction in plan view.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to an electric shovel.

Background Art

[0002] A technique for cooling a battery in a small electric shovel is disclosed, for example, in Japanese Patent Application Laid-Open No. 2012-1933 (Patent Document 1). In Patent Document 1, one end of a duct is connected to the upper surface of a covering sheet that covers the upper surface and side surfaces of a battery housing structure. The other end of the duct is connected to a machine room that is forcibly exhausted by a cooling fan. In the machine room, a hydraulic pump, an electric motor, an oil tank, a heat exchanger, an oil cooler, etc. are arranged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In medium or large electric shovels, the battery becomes larger, and the occupied space of the battery in the exterior cover increases. For this reason, it is necessary to review the arrangement of components such as hydraulic equipment (hydraulic oil tank, main valve) and electric motors. As a result, there is a possibility that hydraulic equipment may be arranged near the battery.

[0005] The allowable temperature for the battery to function stably is low, while hydraulic equipment such as a hydraulic oil tank and a main valve generates a large amount of heat during operation, and the ambient temperature becomes high. Therefore, when hydraulic equipment is arranged near the battery, heat may be transferred from the hydraulic equipment to the battery, causing the battery to be heated above the allowable temperature and possibly preventing the battery from functioning stably.

[0006] An object of the present disclosure is to provide an electric excavator capable of suppressing heating of a battery due to heat transfer from hydraulic equipment.

Means for Solving the Problems

[0007] The electric excavator of the present disclosure includes an exterior cover, a battery, hydraulic equipment, and a cooling device. The exterior cover has a first side plate and a second side plate that face each other in the left-right direction, a first ventilation hole provided in the first side plate, and a second ventilation hole provided in the second side plate. The battery is disposed between the first side plate and the second side plate and supplies power to a power source. The hydraulic equipment is disposed in front of the battery. The cooling device has a cooling fan and is disposed so as to face, in a plan view, a region sandwiched between the battery and the hydraulic equipment in the left-right direction.

Effects of the Invention

[0008] According to the present disclosure, it is possible to realize an electric excavator capable of suppressing heating of a battery due to heat transfer from hydraulic equipment.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] In the specification and the drawings, the same components or corresponding components are denoted by the same reference numerals, and redundant descriptions are not repeated. Also, in the drawings, for convenience of explanation, the configuration may be omitted or simplified. Further, at least a part of the embodiments and the modifications may be arbitrarily combined with each other.

[0012] In the following description, “up”, “down”, “front”, “rear”, “left”, and “right” are directions based on the operator seated on the driver's seat 4S in the cab 4 shown in FIG. 1.

[0013] <Configuration of the Power Shovel> First, the configuration of the power shovel of the present embodiment will be described with reference to FIG. 1.

[0014] FIG. 1 is a perspective view schematically showing the configuration of a power shovel in an embodiment of the present disclosure. As shown in FIG. 1, the power shovel 100 has a main body 1 and a working machine 2 that operates by hydraulic pressure. The main body 1 has a slewing body 3 and a traveling body 5.

[0015] The traveling body 5 has a pair of crawler belts 5Cr and a traveling motor 5M. The power shovel 100 can travel by the rotation of the crawler belts 5Cr. The traveling motor 5M is provided as a drive source for the traveling body 5. The traveling motor 5M is a hydraulic motor that operates by hydraulic pressure. Note that the traveling body 5 may have wheels (tires).

[0016] The slewing body 3 is disposed on and supported by the traveling body 5. The slewing body 3 is slewing-capable relative to the traveling body 5 about a slewing axis RX by a slewing motor (not shown). The slewing motor is a hydraulic motor actuated by hydraulic pressure. The slewing axis RX is an imaginary straight line that is the slewing center of the slewing body 3. Note that the traveling motor 5M or the slewing motor may be an electric motor.

[0017] The slewing body 3 has a driver's cab 4 (cab). Inside the driver's cab 4, a driver's seat 4S on which an operator sits is provided. The operator (crew member) boards the driver's cab 4 and can operate the working machine 2, slew the slewing body 3 relative to the traveling body 5, and operate the traveling of the electric excavator 100 by the traveling body 5. The slewing body 3 has an exterior cover 9. The exterior cover 9 covers the machine room. The electric excavator may be remotely operated.

[0018] The working machine 2 is supported by the slewing body 3. The working machine 2 has a boom 6, an arm 7, and a bucket 8. The working machine 2 further has a boom cylinder 10, an arm cylinder 11, and a bucket cylinder 12.

[0019] The boom 6 is rotatably connected to the main body 1. Specifically, the base end portion of the boom 6 is rotatably connected to the slewing body 3 with a boom foot pin 13 as a fulcrum. The arm 7 is rotatably connected to the boom 6. Specifically, the base end portion of the arm 7 is rotatably connected to the tip end portion of the boom 6 with a boom top pin 14 as a fulcrum. The bucket 8 is rotatably connected to the arm 7. Specifically, the base end portion of the bucket 8 is rotatably connected to the tip end portion of the arm 7 with an arm top pin 15 as a fulcrum.

[0020] One end of the boom cylinder 10 is connected to the slewing body 3, and the other end is connected to the boom 6. The boom 6 is drivable relative to the main body 1 by the boom cylinder 10. By this drive, the boom 6 is vertically rotatable relative to the slewing body 3 with the boom foot pin 13 as a fulcrum.

[0021] One end of the arm cylinder 11 is connected to the boom 6, and the other end is connected to the arm 7. The arm 7 can be driven with respect to the boom 6 by the arm cylinder 11. By this drive, the arm 7 can rotate in the vertical direction or the front-rear direction with respect to the boom 6 with the boom top pin 14 as a fulcrum.

[0022] One end of the bucket cylinder 12 is connected to the arm 7, and the other end is connected to the bucket link 17. The bucket 8 can be driven with respect to the arm 7 by the bucket cylinder 12. By this drive, the bucket 8 can rotate in the vertical direction with respect to the arm 7 with the arm top pin 15 as a fulcrum.

[0023] Each of the boom cylinder 10, the arm cylinder 11, and the bucket cylinder 12 is a hydraulic cylinder and is driven by hydraulic pressure.

[0024] <Arrangement of Side Plates of the Outer Cover and Components in the Machine Room> Next, the arrangement of the side plates of the outer cover and the components in the machine room of the electric excavator shown in FIG. 1 will be described with reference to FIGS. 2 to 7. Note that in FIGS. 2 and 3, a part of the outer cover 9 is shown broken away.

[0025] Each of FIGS. 2 and 3 is a perspective view showing the state of the machine room in the electric excavator shown in FIG. 1. FIG. 4 is a plan view showing the state of the machine room in the electric excavator shown in FIG. 1. As shown in FIG. 2, the revolving body 3 (FIG. 1) has a revolving frame 20. The revolving frame 20 revolves with respect to the traveling body 5 (FIG. 1) about the revolving axis RX.

[0026] The revolving frame 20 has a center frame CF, a left deck DL, and a right deck DR. The center frame CF is located approximately at the center in the left-right direction of the revolving frame 20. The left deck DL is disposed on the left side of the center frame CF. The right deck DR is disposed on the right side of the center frame CF.

[0027] The center frame CF has a pair of center beams CB. The pair of center beams CB are arranged to face each other with a space therebetween in the left - right direction. The pair of center beams CB support the working machine 2 (Figure 1). Thus, the center frame CF supports the working machine 2.

[0028] Each of the pair of center beams CB has through - holes TH1, TH2. The boom foot pin 13 (Figure 1) is inserted into the through - hole TH1. The boom 6 (Figure 1) is rotatably supported by the boom foot pin 13 on the pair of center beams CB.

[0029] A pin (not shown) that supports the boom cylinder 10 (Figure 1) is inserted into the through - hole TH2. The boom cylinder 10 is rotatably supported by this pin on the center beam CB.

[0030] As shown in Figure 3, on the slewing frame 20, there are mounted items such as a battery 31, a hydraulic oil tank 32, a switching valve 33 (main valve), a partition member 34, a cooling device 40, an oil cooler 41, a radiator 42, and an operator's cab 4 (Figure 1). The battery 31, the hydraulic oil tank 32, the switching valve 33, the cooling device 40, etc. are arranged in a machine room covered by an exterior cover 9 (Figure 1).

[0031] The cooling device 40 has, for example, four cooling fans 40a. By arranging two cooling fans 40a in the vertical direction and two cooling fans 40a in the front - rear direction, a total of four cooling fans 40a are arranged.

[0032] The battery 31 includes, for example, a plurality of battery modules, and each of the plurality of battery modules has battery cells. The battery 31 is a power source that stores electrical energy obtained from an external power source. The battery 31 extracts the stored electrical energy as electromotive force. The battery 31 supplies power to an electric motor (not shown) via an inverter (not shown). The battery 31 is a lithium ion battery, an electric double layer capacitor, a lead storage battery, or the like. The battery 31 is a rechargeable battery (storage battery).

[0033] The battery 31 is disposed on a pair of center beams CB via brackets (not shown). The power shovel 100 of the present embodiment does not have a counterweight, and the battery 31 serves as a counterweight. For this reason, the battery 31 is disposed at the rear of the revolving body 3.

[0034] As shown in FIG. 4, the region behind each of the rear end RL of the left deck DL and the rear end RR of the right deck DR is originally a region where a counterweight is disposed. The battery 31 has a portion that is located behind each of the rear end RL of the left deck DL and the rear end RR of the right deck DR in plan view in order to serve as a counterweight. For this reason, the rear end 31R of the battery 31 is located behind each of the rear end RL of the left deck DL and the rear end RR of the right deck DR in plan view. The plan view in this specification means a viewpoint of looking down from above in a direction (vertical direction) orthogonal to the bottom plate BP of the slewing frame 20.

[0035] In medium or large electric shovels, since the amount of energy required for operation increases, the battery 31 also becomes larger. If the height of the battery 31 is increased, the rear visibility of the operator sitting in the driver's seat 4S deteriorates. Therefore, if the height of the battery 31 is suppressed, the planar occupation area of the battery 31 becomes larger. For this reason, the battery 31 does not fit entirely within the arrangement area of the counterweight in plan view and protrudes into the machine room. As a result, in plan view, the front end 31F of the battery 31 is positioned in front of each of the rear end RL of the left deck DL and the rear end RR of the right deck DR. When the battery 31 protrudes into the machine room in this way, restrictions are imposed on the arrangement of items other than the battery 31.

[0036] Note that the machine room is a space located in front of each of the rear end RL of the left deck DL and the rear end RR of the right deck DR, and means a space covered by the exterior cover 9.

[0037] Hydraulic equipment (such as the hydraulic oil tank 32, switching valve 33, hydraulic pump (not shown), etc.) is arranged in front of the battery 31. Also, an inverter, an electric motor, etc. are arranged in front of the battery 31.

[0038] The battery 31 supplies electric power to an electric motor (not shown) as a power source. Specifically, the battery 31 supplies electric power to the inverter through electric wiring. The inverter converts the DC power that is the output of the battery 31 into AC power with controlled frequency and the like. The inverter supplies AC power to the electric motor through electric wiring. As a result, the electric motor is driven by the AC power supplied from the inverter using the battery 31 as a power source.

[0039] The electric motor and the hydraulic pump are mechanically connected. When the driving force of the electric motor is transmitted to the hydraulic pump, the hydraulic pump is driven. When the hydraulic pump is driven, it pumps hydraulic oil from the hydraulic oil tank 32. The hydraulic pump supplies the hydraulic oil pumped from the hydraulic oil tank 32 to each hydraulic actuator (travel motor 5M, slewing motor, each hydraulic cylinder 10 - 12) through the switching valve 33.

[0040] The switching valve 33 is configured as an assembly of a number of control valves, pilot valves, etc. The switching valve 33 is disposed in an oil passage (hydraulic piping) between the hydraulic pump and the hydraulic actuator. The switching valve 33 supplies and discharges the hydraulic oil pumped from the hydraulic oil tank 32 by the hydraulic pump to and from the hydraulic actuator. Each hydraulic actuator operates by the supply and discharge of the hydraulic oil from the switching valve 33.

[0041] The opening and closing of each valve in the switching valve 33 is controlled according to the operation of the operator. Thereby, according to the operation of the operator boarding the cab 4, the main body 1 and the working machine 2 of the electric excavator 100 can be operated. Specifically, the operator can operate the working machine 2 by operating the hydraulic cylinders 10 to 12, can operate the turning of the revolving body 3 by operating the slewing motor, and can operate the traveling of the electric excavator 100 by operating the traveling motor 5M.

[0042] As shown in FIG. 2, the exterior cover 9 has a left side plate 9L (first side plate). A ventilation port VL (first ventilation port) is provided in the left side plate 9L. The ventilation port VL is a through hole provided in the left side plate 9L, for example, a rectangular through hole to which a net is attached. The ventilation port VL may be a plurality of through holes formed by punching a material such as metal, for example, punching metal.

[0043] As shown in FIG. 3, the exterior cover 9 has a right side plate 9R (second side plate). A ventilation port VR (second ventilation port) is provided in the right side plate 9R. The ventilation port VR is a through hole provided in the right side plate 9R. The ventilation port VR is a plurality of through holes formed by punching a material such as metal, for example, punching metal.

[0044] As shown in FIG. 4, the left side plate 9L and the right side plate 9R of the exterior cover 9 face each other in the left-right direction. Also, the ventilation port VL provided in the left side plate 9L and the ventilation port VR provided in the right side plate 9R face each other in the left-right direction.

[0045] In a plan view, between the left side plate 9L and the right side plate 9R, there are arranged a battery 31, hydraulic equipment (hydraulic oil tank 32, switching valve 33), a partition member 34, a cooling device 40, an oil cooler 41, and a radiator 42. Each of the cooling device 40, the oil cooler 41, and the radiator 42 is arranged within a region that linearly connects the ventilation port VL and the ventilation port VR. Also, the region sandwiched between the battery 31 and the hydraulic equipment 32, 33 is arranged within the region that linearly connects the ventilation port VL and the ventilation port VR. Further, each of the hydraulic oil tank 32 and the switching valve 33 may be arranged within the region that linearly connects the ventilation port VL and the ventilation port VR. Also, a part of the battery 31 may be arranged within the region that linearly connects the ventilation port VL and the ventilation port VR.

[0046] The hydraulic oil tank 32 is arranged, for example, on the right deck DR. The hydraulic oil tank 32 is arranged in front of the battery 31 with a gap therebetween. The switching valve 33 is arranged on the center frame CF. The switching valve 33 is arranged in front of the battery 31 with a gap therebetween.

[0047] Each of the hydraulic oil tank 32 and the switching valve 33 is arranged behind the opening 21 provided in the center frame CF. The opening 21 is, for example, a through hole through which a swivel joint (not shown) is inserted, and serves as the turning center of the swivel frame 20. The opening 21 is provided in the bottom plate BP of the center frame CF.

[0048] Each of the cooling device 40, the oil cooler 41, and the radiator 42 is arranged, for example, on the left deck DL. Each of the oil cooler 41 and the radiator 42 is arranged side by side with the cooling device 40 in the left - right direction. The cooling device 40 is arranged so as to face, in a plan view, the region sandwiched between the battery 31 and the hydraulic equipment 32, 33 in the left - right direction. Note that each of the cooling device 40, the oil cooler 41, and the radiator 42 may be arranged, for example, on the right deck DR.

[0049] The cooling device 40 has a plurality of cooling fans 40a. The cooling device 40 causes air to flow between the ventilation port VL and the ventilation port VR by driving the plurality of cooling fans 40a. By driving the plurality of cooling fans 40a, the cooling device 40 takes in air from the outside to the inside of the machine room at the ventilation port VL, passes it between the battery 31 and the hydraulic devices 32 and 33, and then discharges it from the inside to the outside of the machine room at the ventilation port VR, as indicated by the arrows A1 and A2 in FIG. 4, for example. As a result, the air taken in from the outside to the inside of the machine room at the ventilation port VL passes through the space sandwiched between the front surface of the battery 31 and the rear surfaces of the hydraulic devices 32 and 33, and is discharged from the inside to the outside of the machine room at the ventilation port VR.

[0050] Alternatively, the cooling device 40 may take in air from the outside to the inside of the machine room at the ventilation port VR, pass it between the battery 31 and the hydraulic devices 32 and 33 by driving the plurality of cooling fans 40a, and then discharge it from the inside to the outside of the machine room at the ventilation port VL. In this case, the ventilation port VR for taking air into the machine room becomes the first ventilation port, and the ventilation port VL for discharging air from the machine room becomes the second ventilation port. Also, the right side plate 9R provided with the ventilation port VR becomes the first side plate, and the left side plate 9L provided with the ventilation port VL becomes the second side plate.

[0051] The partition member 34 is, for example, a plate-shaped member made of a steel plate. The partition member 34 extends in the left-right direction. The partition member 34 is disposed between the battery 31 and the hydraulic devices 32 and 33. Specifically, the partition member 34 extends from the vicinity of the cooling device 40 through between the battery 31 and the switching valve 33 and between the battery 31 and the hydraulic oil tank 32 to the vicinity of the right side plate 9R. The partition member 34 extends from the left deck DL across the center frame CF to the right deck DR.

[0052] The partition member 34 has a first portion 34F, a second portion 34S, and a third portion 34T. The first portion 34F is connected to the left end portion (one end portion) of the third portion 34T and extends linearly along the left - right direction from its left end portion. The second portion 34S is connected to the right end portion (the other end portion) of the third portion 34T and extends linearly along the left - right direction from its right end portion. The first portion 34F and the second portion 34S extend in, for example, parallel directions to each other in plan view. The third portion 34T extends linearly so as to be inclined with respect to each of the first portion 34F and the second portion 34S in plan view.

[0053] The left end portion of the third portion 34T is located in front of the right end portion of the third portion 34T. The third portion 34T is inclined with respect to the left - right direction such that it is located more rearward as it goes from the left end portion to the right end portion.

[0054] A gap (space) is provided between the battery 31 and the partition member 34 in plan view. Each of the front surface of the battery 31 and the rear surface of the partition member 34 faces the gap. The front surface of the battery 31 and the rear surface of the partition member 34 face each other with a gap therebetween in the front - rear direction.

[0055] Also, gaps are provided between the partition member 34 and the hydraulic oil tank 32 and between the partition member 34 and the switching valve 33 in plan view. Each of the rear surface of the hydraulic oil tank 32, the rear surface of the switching valve 33, and the front surface of the partition member 34 faces the gap. The rear surface of the hydraulic oil tank 32 and the front surface of the partition member 34 face each other with a gap therebetween in the front - rear direction. Also, the rear surface of the switching valve 33 and the front surface of the partition member 34 face each other with a gap therebetween in the front - rear direction.

[0056] The cooling device 40 sends air to the area on the battery 31 side with respect to the partition member 34 as shown by the arrow A1. Also, the cooling device 40 sends air to the area on the side of the hydraulic devices 32 and 33 with respect to the partition member 34 as shown by the arrow A2. The air indicated by the arrow A1 flows in the gap between the rear surface of the partition member 34 and the front surface of the battery 31. Also, the air indicated by the arrow A2 flows into each of the gap between the front surface of the partition member 34 and the rear surface of the switching valve 33 and the gap between the front surface of the partition member 34 and the rear surface of the hydraulic oil tank 32.

[0057] The cooling device 40 is arranged in the area that linearly connects the ventilation port VL and the ventilation port VR. The rotation axis AX of the cooling fan 40a in the cooling device 40 extends in the direction (the direction from the ventilation port VL to the ventilation port VR) that linearly connects the ventilation port VL and the ventilation port VR. The rotation axis AX extends, for example, along the left - right direction.

[0058] At least a part of the cooling device 40 faces the ventilation port VR without an obstacle in between. Thereby, at least a part of the air sent out from the cooling device 40 flows linearly without colliding with an obstacle and reaches the ventilation port VR, and is discharged from the ventilation port VR.

[0059] The front - row cooling fans 40a in the cooling device 40 are arranged so as to face the switching valve 33 and the hydraulic oil tank 32 respectively in the left - right direction. Thereby, a part of the air sent out from the cooling device 40 flows linearly from the cooling device 40 and directly hits the hydraulic devices 32 and 33.

[0060] The rear - row cooling fans 40a in the cooling device 40 are arranged so as to face the battery 31 in the left - right direction. Thereby, a part of the air sent out from the cooling device 40 flows linearly from the cooling device 40 and directly hits the battery 31.

[0061] The oil cooler 41 is a device for cooling the hydraulic oil used, for example, in the operation of hydraulic actuators (travel motor 5M, slewing motor, each hydraulic cylinder 10 - 12). The oil cooler 41 has, for example, a tube through which the hydraulic oil passes and fins attached to the tube.

[0062] The radiator 42 is a device for cooling a cooling medium (for example, cooling water) for cooling, for example, the battery 31, electric motor, inverter, etc. The radiator 42 has, for example, a tube through which the cooling medium passes and fins attached to the tube.

[0063] The oil cooler 41 and the radiator 42 are arranged side by side in the front - rear direction. The oil cooler 41 is located in front of the radiator 42. The oil cooler 41 faces the hydraulic equipment 32, 33 in the direction in which the rotation axis AX of the cooling fan 40a extends and is arranged side by side with the hydraulic equipment 32, 33 in the left - right direction. The oil cooler 41 is arranged, for example, to face the front - row cooling fan 40a in the cooling device 40 in the left - right direction.

[0064] The radiator 42 faces the battery 31 in the direction in which the rotation axis AX of the cooling fan 40a extends and is arranged side by side with the battery 31 in the left - right direction. The radiator 42 is arranged, for example, to face the rear - row cooling fan 40a in the cooling device 40 in the left - right direction.

[0065] The position of the left end of the partition member 34 in the front - rear direction is located, for example, between the two cooling fans 40a in the front - rear direction. As a result, the cooling fan 40a arranged in the rear row in the front - rear direction sends air to the area on the battery 31 side with respect to the partition member 34. Also, the cooling fans 40a arranged in the front row in the front - rear direction send air to each of the areas on the side of the hydraulic equipment 32, 33 with respect to the partition member 34.

[0066] As shown in FIG. 3, the upper end of the partition member 34 is located above the upper surface of the hydraulic oil tank 32 and the upper end of the switching valve 33. Thereby, it is effectively prevented that the oil blown out from the hydraulic oil tank 32 and the switching valve 33 hits the battery 31.

[0067] The rotation axis AX of the cooling fan 40a in the cooling device 40 extends in the left - right direction (a direction perpendicular to the front - rear direction) in plan view. However, as shown in FIG. 5, the rotation axis AX of the cooling fan 40a may be inclined with respect to the left - right direction in plan view. Specifically, in plan view, the rotation axis AX may be inclined so that it is positioned from the front to the rear as it goes from the left side to the right side in the left - right direction. Also, it may be inclined so that it is positioned from the rear to the front as it goes from one side (for example, the left side) to the other side (for example, the right side) in the left - right direction. The virtual extension line of the rotation axis AX extends into the region sandwiched between the battery 31 and the hydraulic devices 32, 33.

[0068] As shown in FIG. 6, each of the oil cooler 41 and the radiator 42 may be arranged on the side opposite to the left - hand side plate 9L with respect to the cooling device 40. That is, a ventilation port VL may be arranged on one side (for example, the left side) in the left - right direction of the cooling device 40, and the oil cooler 41 and the radiator 42 may be arranged on the other side (for example, the right side) in the left - right direction of the cooling device 40.

[0069] Also, the partition member 34 may extend linearly in the entire left - right direction from the left - hand end to the right - hand end without having the third portion 34T which becomes an inclined portion as shown in FIG. 4 in plan view.

[0070] Also, in the above - described embodiment, the configuration in which the partition member 34 is provided has been described, but the partition member 34 may be omitted. In this case, the front surface of the battery 31 and the rear surfaces of the hydraulic devices 32, 33 face each other in the front - rear direction with a gap therebetween.

[0071] Also, the arrangement of components in the machine room is not limited to the arrangement shown in FIG. 4, and for example, an arrangement such as the modified example shown in FIG. 7 may be used. In the arrangement of the modified example shown in FIG. 7, in front of the battery 31, the electric motor 35, the inverter 36, and the hydraulic oil tank 32 are arranged on the right deck DR in this order. Specifically, the electric motor 35 is arranged in front of the battery 31, the inverter 36 is arranged in front of the electric motor 35, and the hydraulic oil tank 32 is arranged in front of the inverter 36. A hydraulic pump (not shown) is arranged below the inverter 36.

[0072] In such an arrangement, the partition member 34 may be arranged at least between the battery 31 and the switching valve 33. In this modified example, the partition member 34 extends in the left-right direction from the vicinity of the cooling device 40 to the vicinity between the battery 31 and the switching valve 33. In the present embodiment, since there is a cable between the electric motor 35 and the battery 31, the partition member 34 extends to the vicinity of the switching valve 34, but may extend to the right end as in FIG. 4.

[0073] Note that since the configuration of FIG. 7 other than the above is substantially the same as the configuration of FIG. 4, the same reference numerals are given to the same elements, and the description thereof will not be repeated.

[0074] <Effect> Next, the effects of the present embodiment will be described.

[0075] As shown in FIG. 4, in a medium or large-sized electric excavator 100, the battery 31 becomes larger, and the occupied space of the battery 31 in the exterior cover 9 increases. For this reason, in the exterior cover 9, there is a possibility that hydraulic equipment (hydraulic oil tank 32, switching valve 33) is arranged near the battery 31.

[0076] The allowable temperature of the battery 31 is as low as around 60°C, while the heat dissipation temperature of the hydraulic devices 32 and 33 is as high as about 100°C. Therefore, when the hydraulic devices 32 and 33 are arranged near the battery 31, heat is transferred from the hydraulic devices 32 and 33 to the battery 31, causing the battery 31 to be heated above the allowable temperature and unable to function stably.

[0077] Therefore, in the present embodiment, as shown in FIG. 4, the cooling device 40 is arranged so as to face the region sandwiched between the battery 31 and the hydraulic devices 32 and 33 in a plan view in the left - right direction. Thereby, as shown by the arrows A1 and A2 in FIG. 4, the air taken in from the ventilation port VL by the cooling device 40 is passed between the battery 31 and the hydraulic devices 32 and 33 and then discharged from the ventilation port VR. Thereby, air can flow linearly in the left - right direction from the ventilation port VL to the ventilation port VR in the machine room, and it is difficult for resistance to occur in the air flow. For this reason, the transfer of heat from the hydraulic devices 32 and 33 to the battery 31 can be effectively blocked, and the heat of the hydraulic devices 32 and 33 can be effectively discharged to the outside of the machine room. By these means, it is possible to suppress the heating of the battery 31 due to the transfer of heat from the hydraulic devices 32 and 33.

[0078] Note that by driving the cooling fan 40a, the air taken in from the ventilation port VR may be passed between the battery 31 and the hydraulic devices 32 and 33 and then discharged from the ventilation port VL.

[0079] Also, in the present embodiment, as shown in FIG. 4, the partition member 34 is arranged between the battery 31 and the hydraulic devices 32 and 33. The partition member 34 prevents the oil blown out from the hydraulic devices 32 and 33 from hitting the battery 31, preventing damage to the battery 31 or the heavy - electrical equipment. Also, the partition member 34 can block the transfer of heat from the hydraulic devices 32 and 33 to the battery 31.

[0080] Also, in the present embodiment, as shown by the arrows A1 and A2 in FIG. 4, the cooling device 40 sends air to each of the region on the battery 31 side with respect to the partition member 34 and the region on the hydraulic devices 32 and 33 side with respect to the partition member 34. As shown by the arrow A2, when air is sent to the region on the hydraulic devices 32 and 33 side with respect to the partition member 34, the transfer of heat from the hydraulic devices 32 and 33 to the partition member 34 can be suppressed. Also, as shown by the arrow A1, when air is sent to the region on the battery 31 side with respect to the partition member 34, the transfer of heat from the partition member 34 to the battery 31 is suppressed. Thereby, the transfer of heat from the hydraulic devices 32 and 33 to the battery 31 via the partition member 34 is suppressed.

[0081] Also, in the present embodiment, as shown in FIG. 4, at least a part of the cooling device 40 faces the hydraulic devices 32 and 33 in the direction in which the rotation axis AX of the cooling fan 40a extends. Thereby, the air sent out from the cooling device 40 flows linearly and heads toward the hydraulic devices 32 and 33. For this reason, the hydraulic devices 32 and 33 themselves can be cooled by the air sent out from the cooling device 40.

[0082] Also, in the region where the cooling device 40 and the hydraulic devices 32 and 33 face each other in the direction of the rotation axis AX, there may be no obstacle between the cooling device 40 and the hydraulic devices 32 and 33. In this case, since the air sent out from the cooling device 40 directly hits the hydraulic devices 32 and 33, the hydraulic devices 32 and 33 can be cooled more effectively.

[0083] Also, in the present embodiment, as shown in FIG. 4, at least a part of the cooling device 40 faces the battery 31 in the direction in which the rotation axis AX of the cooling fan 40a extends. Thereby, the relatively low-temperature (MAX 65°C or lower) air sent out from the cooling device 40 flows linearly and heads toward the battery 31. For this reason, the battery 31 itself can be cooled by the air sent out from the cooling device 40.

[0084] Also, in a region where the cooling device 40 and the battery 31 face each other in the direction of the rotation axis AX, there may be no obstacle between the cooling device 40 and the battery 31. In this case, since the air sent out from the cooling device 40 directly hits the battery 31, the battery 31 can be cooled more effectively.

[0085] Also, in the present embodiment, as shown in FIG. 4, the oil cooler 41 faces the hydraulic devices 32 and 33 in the direction in which the rotation axis AX of the cooling fan 40a extends, and is arranged side by side with the hydraulic devices 32 and 33 in the left-right direction. The radiator 42 faces the battery 31 in the direction in which the rotation axis AX of the cooling fan 40a extends, and is arranged side by side with the battery 31 in the left-right direction. Thereby, each of the oil cooler 41 and the radiator 42 can also be cooled by the cooling device 40.

[0086] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0087] 1 Body, 2 Working machine, 3 Slewing body, 4 Cab, 4S Driver's seat, 5 Traveling body, 5Cr Crawler, 5M Traveling motor, 6 Boom, 7 Arm, 8 Bucket, 9 Exterior cover, 9L Left side plate, 9R Right side plate, 10 Boom cylinder, 11 Arm cylinder, 12 Bucket cylinder, 13 Boom foot pin, 14 Boom top pin, 15 Arm top pin, 17 Bucket link, 20 Slewing frame, 21 Opening, 31 Battery, 31F Front end, 31R,RL,RR Rear end, 32 Hydraulic oil tank, 33 Switching valve, 34 Partition member, 34T Third part, 34F First part, 34S Second part, 35 Electric motor, 36 Inverter, 40 Cooling device, 40a Cooling fan, 41 Oil cooler, 42 Radiator, 100 Electric excavator, AX Rotation axis, BP Bottom plate, CB Center beam, CF Center frame, DL Left deck, DR Right deck, RX Slewing axis, TH1,TH2 Through hole, VL,VR Ventilation opening.

Claims

1. An exterior cover having a first side plate and a second side plate facing each other in the left-right direction, a first ventilation opening provided in the first side plate, and a second ventilation opening provided in the second side plate, A battery disposed between the first side plate and the second side plate and supplying power to a power source, A hydraulic device disposed in front of the battery, A cooling device having a cooling fan and disposed so as to face a region sandwiched between the battery and the hydraulic device in a plan view and the left-right direction, The cooling device has a first cooling fan and a second cooling fan, The cooling device is arranged to send air to a first region on the battery side with the first cooling fan and send air to a second region on the hydraulic device side with the second cooling fan, An electric shovel in which air sent to the first region for cooling the battery and air sent to the second region for cooling the hydraulic device are discharged from the common second ventilation opening.

2. The electric shovel according to claim 1, wherein air taken in from the first ventilation opening by driving of the cooling fan passes between the battery and the hydraulic device and is discharged from the second ventilation opening.

3. The electric shovel according to claim 1 or claim 2, further comprising a partition member disposed between the battery and the hydraulic device.

4. The electric shovel according to claim 3, wherein the cooling device is arranged to send air to each of a region on the battery side with respect to the partition member and a region on the hydraulic device side with respect to the partition member.

5. The electric shovel according to any one of claims 1 to 4, wherein at least a part of the cooling device faces the hydraulic device in a direction in which the rotation axis of the cooling fan extends.

6. The electric shovel according to any one of claims 1 to 4, wherein at least a part of the cooling device faces the battery in a direction in which the rotation axis of the cooling fan extends.

7. An oil cooler facing the hydraulic device in a direction in which the rotation axis of the cooling fan extends, The electric shovel according to any one of claims 1 to 4, further comprising a radiator facing the battery in a direction in which the rotation axis of the cooling fan extends.

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