Work machine

Abstract

To provide a work machine whose body can be well balanced, even when a high-capacity (large-sized) battery unit is used.SOLUTION: The work machine comprises a battery unit that is mounted on a body frame and stores electrical power to drive an electric motor, and electrical equipment mounted on the battery unit. The electrical equipment and the electric motor are arranged side by side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been proposed a hydraulic excavator in which a hydraulic pump is driven by an electric motor, and hydraulic oil is supplied from the hydraulic pump to a hydraulic actuator to drive the hydraulic actuator (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-211394 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a battery for driving an electric motor is located at the rear end of the upper rotating body. The battery is located on the upper rotating body higher than the electric motor and the hydraulic pump. With this arrangement, the heavy battery is located at the top, so the center of gravity of the hydraulic excavator is high. As a result, it becomes difficult to maintain good balance of the hydraulic excavator. In particular, when a large-capacity battery (for example, a battery unit in which multiple batteries are unitized) is used, it becomes increasingly difficult to maintain good balance of the machine.

[0005] The present invention has been made to solve the above-mentioned problems, and its object is to provide a work machine that can maintain good body balance even when a large-capacity (large) battery unit is used. [Means for solving the problem]

[0006] A work machine according to one aspect of the present invention comprises a battery unit arranged on a body frame and storing power for driving an electric motor, and electrical equipment arranged on the battery unit, with the electrical equipment and the electric motor arranged side by side. Effect of the Invention

[0007] Even when a large-capacity (large) battery unit is used, the aircraft balance can be maintained well. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view showing a schematic configuration of a hydraulic excavator, which is an example of an electric working machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a schematic configuration of a control system and a hydraulic system of the hydraulic excavator. [Diagram 3] FIG. 2 is a perspective view of the inside of a machine room of an upper rotating body of the hydraulic excavator as viewed from the rear. [Figure 4] FIG. 2 is a plan view showing the arrangement of each component in the engine room. [Diagram 5] FIG. 2 is a right side view of the interior of the engine room. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes an embodiment of the present invention with reference to the drawings.

[0010] [1. Electric working machines] 1 is a side view showing a schematic configuration of a hydraulic excavator (electric excavator) 1, which is an example of an electric work machine according to this embodiment. The hydraulic excavator 1 includes a lower traveling structure 2, a work machine 3, and an upper rotating structure 4.

[0011] Here, the directions are defined as follows. The direction in which the operator (pilot, driver) seated on the driver's seat 41a of the upper rotating body 4 faces forward is defined as the forward direction, and the opposite direction is defined as the rearward direction. Therefore, when the upper rotating body 4 is not rotating relative to the lower running body 2 (rotation angle 0°), the front-to-rear direction of the upper rotating body 4 coincides with the direction in which the lower running body 2 moves forward and backward. Also, the left side as seen from the operator seated on the driver's seat 41a is defined as the "left" and the right side is defined as the "right". Furthermore, the direction of gravity perpendicular to the front-to-rear and left-to-right directions is defined as the up-down direction, the upstream side of the direction of gravity is defined as the "up" and the downstream side is defined as the "down". In the drawings, the upper rotating body 4 is shown in a non-rotating state relative to the lower running body 2, and as necessary, the front is indicated with the symbol "F", the rear with the symbol "B", the right with the symbol "R", the left with the symbol "L", the up with the symbol "U", and the down with the symbol "D".

[0012] The lower traveling structure 2 includes a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, to move the hydraulic excavator 1 forward and backward. The lower traveling structure 2 is provided with a blade 23 for performing ground leveling work and a blade cylinder 23a. The blade cylinder 23a is a hydraulic cylinder that rotates the blade 23 up and down.

[0013] The work machine 3 includes a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, the arm 32, and the bucket 33, it is possible to perform work of excavating earth and sand, for example.

[0014] The boom 31 is rotated by a boom cylinder 31a. A base end of the boom cylinder 31a is supported on the front part of the upper rotating body 4 and is movable so as to be telescopic. The arm 32 is rotated by an arm cylinder 32a. A base end of the arm cylinder 32a is supported on the tip part of the boom 31 and is movable so as to be telescopic. The bucket 33 is rotated by a bucket cylinder 33a. A base end of the bucket cylinder 33a is supported on the tip part of the arm 32 and is movable so as to be telescopic. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are constituted by hydraulic cylinders.

[0015] The upper rotating body 4 is located above the lower traveling body 2, and is provided so as to be rotatable relative to the lower traveling body 2 via a swivel bearing (not shown). A control section 41, a swivel frame 42, a swivel motor 43, an engine room 44, etc. are arranged on the upper rotating body 4. The upper rotating body 4 rotates via the swivel bearing by being driven by the swivel motor 43, which is a hydraulic motor.

[0016] A hydraulic pump 71 (see FIG. 2) is disposed on the upper rotating body 4. The hydraulic pump 71 is driven by an electric motor 61 (see FIG. 2) inside the engine room 44. The hydraulic pump 71 supplies hydraulic oil (pressurized oil) to hydraulic motors (e.g., the left and right travel motors 22, the swing motor 43) and hydraulic cylinders (e.g., the blade cylinder 23a, the boom cylinder 31a, the arm cylinder 32a, the bucket cylinder 33a). The hydraulic motors and hydraulic cylinders that are driven by the supply of hydraulic oil from the hydraulic pump 71 are collectively referred to as hydraulic actuators 73 (see FIG. 2).

[0017] A driver's seat 41a is disposed in the control section 41. Various levers 41b are disposed around the driver's seat 41a. When an operator sits on the driver's seat 41a and operates the levers 41b, the hydraulic actuator 73 is driven. This enables the lower traveling body 2 to travel, the blade 23 to perform ground leveling work, the work machine 3 to perform excavation work, the upper rotating body 4 to rotate, and the like.

[0018] A battery unit 53 is disposed on the upper rotating body 4. The battery unit 53 is formed of, for example, a lithium ion battery unit, and stores power for driving the electric motor 61. The battery unit 53 may be formed by unitizing a plurality of batteries, or may be formed of a single battery cell. In addition, a power supply port (not shown) is provided on the upper rotating body 4. The power supply port is connected to a commercial power source 51, which is an external power source, via a power supply cable 52. This allows the battery unit 53 to be charged.

[0019] The upper rotating body 4 is further provided with a lead battery 54. The lead battery 54 outputs a low-voltage (e.g., 12 V) DC voltage. The output from the lead battery 54 is supplied as a control voltage to, for example, a blower fan F (see FIG. 4) and a system controller 67 (see FIG. 2) described later.

[0020] The hydraulic excavator 1 may be configured to use hydraulic equipment such as the hydraulic actuator 73 in combination with an actuator driven by electricity. Examples of the actuator driven by electricity include an electric travel motor, an electric cylinder, and an electric swing motor.

[0021] [2. Control and hydraulic system configuration] 2 is a block diagram showing a schematic configuration of a control system and a hydraulic system of the hydraulic excavator 1. The hydraulic excavator 1 includes an electric motor 61, a charger 62, an inverter 63, a PDU (Power Drive Unit) 64, a junction box 65, a DC-DC converter 66, and a system controller 67. The system controller 67 is formed by an electronic control unit also called an ECU (Electronic Control Unit), and performs electrical control of each part of the hydraulic excavator 1.

[0022] The electric motor 61 is driven by electric power supplied from the battery unit 53 via a junction box 65 and an inverter 63. The electric motor 61 is configured as a permanent magnet motor or an induction motor.

[0023] The charger 62 converts the AC voltage supplied from the commercial power source 51 shown in FIG. 1 via the power supply cable 52 into a DC voltage. The inverter 63 converts the DC voltage supplied from the battery unit 53 into an AC voltage and supplies it to the electric motor 61. This causes the electric motor 61 to rotate. The supply of the AC voltage (current) from the inverter 63 to the electric motor 61 is performed based on a rotation command output from a system controller 67.

[0024] The PDU 64 is a battery control unit that controls an internal battery relay to control input / output of the battery unit 53. The junction box 65 includes a charger relay, an inverter relay, a fuse, etc. The voltage output from the charger 62 is supplied to the battery unit 53 via the junction box 65. In addition, the voltage output from the battery unit 53 is supplied to the inverter 63 via the junction box 65.

[0025] The DC-DC converter 66 steps down the high voltage (e.g., 300 V) supplied from the battery unit 53 to a low voltage (e.g., 12 V). The voltage output from the DC-DC converter 66 is supplied to the blower fan F, the system controller 67, etc., in the same manner as the output from the lead battery 54.

[0026] A plurality of hydraulic pumps 71 are connected to a rotating shaft (output shaft) of the electric motor 61. The plurality of hydraulic pumps 71 include a variable displacement pump and a fixed displacement pump. In FIG. 2, only one hydraulic pump 71 is illustrated as an example. Each hydraulic pump 71 is connected to a hydraulic oil tank 74 that contains (stores) hydraulic oil. The hydraulic pump 71 supplies hydraulic oil in the hydraulic oil tank 74 to a hydraulic actuator 73 via a control valve 72. This drives the hydraulic actuator 73. The control valve 72 is a directional switching valve that controls the flow direction and flow rate of the hydraulic oil supplied to the hydraulic actuator 73.

[0027] As described above, the hydraulic excavator 1 of this embodiment includes at least the electric motor 61 and the battery unit 53 disposed on the upper rotating body 4 (see FIG. 1). The hydraulic excavator 1 also includes the hydraulic actuator 73 that is driven by the supply of hydraulic oil from the hydraulic pump 71.

[0028] [3. Layout of components inside the engine room] FIG. 3 is a perspective view from the rear of the inside of the engine room 44 of the upper rotating body 4. FIG. 4 is a plan view showing the arrangement of each part in the engine room 44. FIG. 5 is a right side view of the inside of the engine room 44. In these drawings, each part is shown as a simple rectangular parallelepiped or cylindrical shape for simplification, but the actual shape may differ from these. In addition, in FIG. 3 and FIG. 4, the seat mount 44M shown in FIG. 5 is omitted for convenience. The seat mount 44M constitutes the upper wall of the engine room 44 and is a base for the driver's seat 41a shown in FIG. 1. In addition, in FIG. 3 and FIG. 5, the blower fan F and the heat exchanger HE shown in FIG. 4 are omitted for convenience.

[0029] (3-1. Electric motor arrangement) The upper rotating body 4 has a rotating frame 42 at its bottom. The rotating frame 42 constitutes the bottom plate of the upper rotating body 4. The above-mentioned battery unit 53 is disposed on the rotating frame 42. In particular, the battery unit 53 is disposed at a rear position on the rotating frame 42. The above-mentioned electric motor 61 is disposed above the battery unit 53. In particular, the electric motor 61 is disposed inside the engine room 44, between the battery unit 53 and the seat mount 44M. The electric motor 61 is located above the battery unit 53 so that an output shaft that outputs power to the hydraulic pump 71 is aligned in the left-right direction.

[0030] Note that, between the battery unit 53 and the revolving frame 42, there is a vibration-proof structure combining vibration-proof rubber, stays, housing, etc., but the vibration-proof structure is not shown in the drawings. Also, the electric motor 61 is disposed above the battery unit 53 and supported by a support structure such as a stay and housing.

[0031] Normally, the battery unit 53 is heavier than the electric motor 61. Moreover, the battery unit 53 becomes larger as its capacity increases. By disposing the electric motor 61 above the battery unit 53 as in this embodiment, the center of gravity of the machine body (hydraulic excavator 1, particularly the upper rotating body 4) can be kept low even when a large-capacity (large) battery unit 53 is disposed on the rotating frame 42. This makes it possible to maintain good machine body balance. Therefore, even when work is performed by driving the hydraulic actuator 73, the hydraulic excavator 1 can be kept in a stable posture and work can be performed well.

[0032] The hydraulic excavator 1 also includes an operator's seat 41a on which an operator sits. The operator's seat 41a is located above the electric motor 61, as shown in Fig. 5. With this configuration, the operator's seat 41a and the electric motor 61 overlap each other when viewed from above, making it possible to shorten the length of the upper rotating body 4 in the front-to-rear direction. As a result, it is easy to reduce the size of the upper rotating body 4 and realize a compact hydraulic excavator 1 with a small turning radius.

[0033] (3-2. Hydraulic pump arrangement) The hydraulic pump 71 described above is disposed to the side of the electric motor 61 (on the right side in FIG. 4 and the like) and, like the electric motor 61, is disposed at a position higher than the battery unit 53. The input shaft of the hydraulic pump 71 is connected to the output shaft of the electric motor 61. Therefore, the hydraulic pump 71 is positioned so that the input shaft is aligned along the left-right direction. In other words, the electric motor 61 and the hydraulic pump 71 are disposed side by side in the left-right direction of the upper rotating body 4. Like the electric motor 61, the hydraulic pump 71 is supported by a support structure such as a stay and a housing. Note that a part of the hydraulic pump 71 is positioned above the battery unit 53, and the remainder protrudes laterally (for example, to the right) from above the battery unit 53 (see FIG. 4), but this point will be described in detail later.

[0034] In this way, by arranging the hydraulic pump 71 at a position higher than the battery unit 53, the hydraulic pump 71 can be arranged side by side (for example, in the left-right direction) with the electric motor 61 in the upper rotating body 4 (particularly in the engine room 44). In other words, the hydraulic pump 71 can be arranged close to the electric motor 61. This makes it possible to realize a compact arrangement of the hydraulic pump 71 and the electric motor 61 in the upper rotating body 4, making it easy to reduce the size of the upper rotating body 4. As a result, it becomes easy to realize a compact hydraulic excavator 1 with a small swing radius.

[0035] In particular, by arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction, it becomes easy to realize a layout in which the electric motor 61 is arranged above the battery unit 53 while a part of the hydraulic pump 71 protrudes laterally (is offset) from the battery unit 53, as in this embodiment. With this layout, even when a hydraulic hose (not shown) is removed from the hydraulic pump 71 during maintenance of the hydraulic pump 71, it is possible to reduce the possibility that hydraulic oil will drip from the connection port of the hydraulic pump 71 with the hydraulic hose and adhere to the battery unit 53.

[0036] The configuration that provides the above-mentioned effects will be described in detail below. As shown in Fig. 2, the hydraulic excavator 1 of this embodiment includes a hydraulic actuator 73 that is driven by the supply of hydraulic oil from a hydraulic pump 71, and a hydraulic oil tank 74 that stores the hydraulic oil. As shown in Figs. 3 to 5, the hydraulic oil tank 74 is disposed forward of the hydraulic pump 71 inside the engine room 44.

[0037] The hydraulic pump 71 also has a suction port 71a and a discharge port 71b. The suction port 71a and the hydraulic oil tank 74 are connected by a hydraulic hose (not shown). Therefore, the hydraulic oil supplied from the hydraulic oil tank 74 through the hydraulic hose enters the inside of the pump through the suction port 71a. On the other hand, the discharge port 71b discharges the hydraulic oil from the hydraulic pump 71 toward the hydraulic actuator 73. The hydraulic oil discharged from the discharge port 71b is supplied to the hydraulic actuator 73 through another hydraulic hose (not shown) and the control valve 72 (see FIG. 2). Note that only one discharge port 71b is shown in the drawing, but the number of discharge ports 71b may be equal to or greater than the number of sections of the control valve 72.

[0038] Thus, the hydraulic pump 71 has a suction port 71a through which hydraulic oil supplied from the hydraulic oil tank 74 passes, and a discharge port 71b through which hydraulic oil passes toward the hydraulic actuator 73. As shown in Figures 4 and 5, the suction port 71a and the discharge port 71b are positioned so as to be shifted in the left-right direction from the battery unit 53. In other words, when viewed from above, the suction port 71a and the discharge port 71b are positioned to the right of the right side surface of the battery unit 53, and are not positioned so as to overlap with the battery unit 53.

[0039] In general, if hydraulic oil adheres to an electric component, the electric component may malfunction. According to the above-described positional relationship between the suction port 71a and the discharge port 71b and the battery unit 53, even if hydraulic oil drips from the suction port 71a or the discharge port 71b of the hydraulic pump 71 when the hydraulic hose is removed from the hydraulic pump 71 for maintenance of the hydraulic pump 71, the adhesion of the hydraulic oil to the battery unit 53 can be reduced. This not only reduces the situation in which the battery unit 53 is soiled with hydraulic oil, but also reduces malfunction of the battery unit 53 caused by the adhesion of hydraulic oil.

[0040] (3-3. Layout of electrical equipment) The charger 62, inverter 63, PDU 64, junction box 65, and DC-DC converter 66 described above are collectively referred to as electrical equipment EC. In the upper rotating body 4 (particularly the engine room 44), the electrical equipment EC is located above the battery unit 53, similar to the electric motor 61. In this embodiment, the junction box 65 is located above the battery unit 53 and to the left rear of the electric motor 61. Furthermore, the PDU 64 is located above the battery unit 53 and to the left of the electric motor 61. Furthermore, the charger 62, inverter 63, and DC-DC converter 66 are located above the battery unit 53 and to the rear of the electric motor 61, stacked in this order from the bottom up.

[0041] The positional relationship of each of these electrical components EC is merely an example, and is not limited to this positional relationship. The vertical positional relationship of the charger 62, the inverter 63, and the DC-DC converter 66 is also not limited to the positional relationship shown in Fig. 3, etc., and the positions of these components may be interchanged in the vertical direction. Each of the electrical components EC is supported on the battery unit 53 by a support structure such as a stay or a housing.

[0042] Thus, the hydraulic excavator 1 further includes the electric motor 61 and the electrical equipment EC located above the battery unit 53 in the upper rotating body 4 (particularly the engine room 44) and shifted in at least one of the front-rear and left-right directions.

[0043] With the above-described arrangement of the electrical equipment EC, the remaining space above the battery unit 53 other than the space for arranging the electric motor 61 can be effectively utilized as the space for arranging the electrical equipment EC. This makes it easy to configure the upper rotating body 4 compact and realize a small hydraulic excavator 1 with a small turning radius. Furthermore, even if the electrical equipment EC is arranged on the battery unit 53 via a support structure, the above-described vibration isolation measure (vibration isolation structure) for the battery unit 53 alone can also serve as the vibration isolation measure for the electrical equipment EC located above it. This eliminates the need to provide separate vibration isolation measures for each electrical equipment EC, making it possible to simplify the support structure for the electrical equipment EC.

[0044] In particular, as shown in Fig. 3 to Fig. 5, the electric components EC include a first electric component EC1 located behind the electric motor 61. That is, the electric motor 61 is located in front of the first electric component EC1 above the battery unit 53. In the above example, the first electric component EC1 includes a charger 62, an inverter 63, and a DC-DC converter 66. Note that the first electric component EC1 may be any one or any two of the charger 62, the inverter 63, and the DC-DC converter 66.

[0045] Among the multiple electric components EC, the electric components other than the first electric component EC1 are also referred to as second electric components EC2. In the above example, the second electric components EC2 are the PDU 64 and the junction box 65. It is also possible to use at least one of the PDU 64 and the junction box 65 as the first electric component EC1 by replacing it with any of the first electric components EC1. By positioning the electric motor 61 forward of the first electric component EC1, the following effects can be obtained.

[0046] For example, in a configuration in which the electric motor 61 is positioned rearward of the first electrical equipment EC1, the upper rotating body 4 must be formed with a shape that has a large turning radius in order to prevent the electric motor 61 and the hydraulic pump 71, which are positioned side by side in the left-right direction, from protruding from the rear (circular portion) of the upper rotating body 4.

[0047] In contrast, in the configuration in which the electric motor 61 is positioned forward of the first electrical component EC1 as in this embodiment, a space for arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction can be secured near the center of the rotating table 42. This eliminates the need to form the upper rotating body 4 in a shape with a large turning radius. In other words, even in the configuration in which the electric motor 61 and the hydraulic pump 71 are arranged side by side in the left-right direction, it is possible to avoid an increase in the size of the upper rotating body 4.

[0048] In addition, the hydraulic pump 71, which is aligned with the electric motor 61 in the left-right direction, is also located forward of the first electrical component EC1. Therefore, as shown in Fig. 4, the distance between the hydraulic oil tank 74 and the hydraulic pump 71 in the engine room 44 can be shortened. This also makes it easier to arrange the hydraulic hoses that connect the hydraulic oil tank 74 and the hydraulic pump 71.

[0049] (3-4. Placement of ventilation fans, heat exchangers, and openings) As shown in FIG. 4, a blower fan F is disposed at the rear right of the engine room 44. The blower fan F circulates air between the inside and outside of the engine room 44. The blower fan F is disposed inside a bonnet 44a that covers the side of the engine room 44. The blower fan F is configured, for example, as an exhaust fan that exhausts air inside the engine room 44 to the outside, but may also be an intake fan that takes in air outside the engine room 44. In other words, the blower fan F may be of either an exhaust type or an intake type.

[0050] A heat exchanger HE is disposed on the revolving frame 42 at a position facing the blower fan F. The heat exchanger HE includes a radiator for performing heat exchange of the cooling medium, and an oil cooler for performing heat exchange of the hydraulic oil. The cooling medium and the hydraulic oil are cooled by heat exchange by blowing air generated by driving the blower fan F against the heat exchanger HE. In this embodiment, the cooling medium is supplied to the battery unit 53 and the electric motor 61. That is, the battery unit 53 and the electric motor 61 are of a water-cooled type. The charger 62, the inverter 63, the PDU 64, and the DC-DC converter 66 are of an air-cooled type. The electric motor 61 may be of an air-cooled type.

[0051] Further, an opening 44P is formed in the bonnet 44a on the left side of the engine room 44. The position where the opening 44P is formed is not particularly limited, but may be formed anywhere on the opposite side of the battery unit 53 from the blower fan F in the left-right direction.

[0052] Thus, the upper rotating body 4 has an engine room 44, a blower fan F, and an opening 44P. The engine room 44 has a rotating frame 42, and houses a battery unit 53, an electric motor 61, a hydraulic pump 71, and a first electric component EC1. The blower fan F is located on one side in the left-right direction of the engine room 44 (the right side in FIG. 4), and circulates air between the inside and outside of the engine room 44. The opening 44P is located on the other side in the left-right direction of the engine room 44 (the left side in the example of FIG. 4).

[0053] In this configuration, when the blower fan F is driven, air can be made to flow from one side to the other in the left-right direction in the engine room 44, above the battery unit 53 and behind the electric motor 61. For example, air can be sucked into the engine room 44 from the left side through the opening 44P and guided to the rear of the electric motor 61, and the air can be discharged to the right side of the engine room 44 by the blower fan F. In addition, in a configuration in which the first electrical component EC1 is located behind the electric motor 61, the first electrical component EC1 can be located in the flow path of the air. This allows the air to hit the first electrical component EC1, thereby efficiently cooling the first electrical component EC1.

[0054] In particular, the first electric component EC1 includes at least one of the charger 62, the DC-DC converter 66, and the inverter 63. In this case, at least one of the charger 62, the DC-DC converter 66, and the inverter 63 can be reliably cooled by driving the blower fan F.

[0055] In the above, the electric work machine has been described taking the hydraulic excavator 1, which is a construction machine, as an example, but the electric work machine is not limited to the hydraulic excavator 1 and may be other construction machines such as a wheel loader. In addition, the electric work machine may be agricultural machinery such as a combine harvester or a tractor.

[0056] Although the embodiment of the present invention has been described above, the scope of the present invention is not limited to this, and the invention can be expanded or modified without departing from the spirit of the invention. [Industrial Applicability]

[0057] The present invention can be used in work machines such as construction machines and agricultural machines. [Explanation of symbols]

[0058] 1. Hydraulic excavator (electric work machine) 2 Undercarriage 4. Upper rotating body 41a Driver's seat 42 Swivel Frame 44 Engine Room 44P opening 53 Battery unit 61 Electric Motor 62 Charger 63 Inverter 66 DC-DC Converter 71 Hydraulic Pump 71a Suction port 71b Discharge port 73 Hydraulic Actuator 74 Hydraulic Oil Tank F Blower fan EC electrical components EC1 First Electrical Equipment

Claims

1. a battery unit disposed on the aircraft frame and storing power for driving the electric motor; an electrical component disposed on the battery unit; A working machine, wherein the electrical equipment and the electric motor are arranged side by side.

2. 2. The work machine according to claim 1, wherein the electrical equipment and the electric motor are arranged side by side in the left-right direction of the machine frame.

3. a hydraulic pump driven by the electric motor; The work machine according to claim 2 , wherein the electrical equipment, the electric motor, and the hydraulic pump are arranged side by side in the left-right direction of the machine frame on the battery unit.

4. The work machine according to claim 3 , wherein the electric motor is disposed between the electrical equipment and the hydraulic pump.

5. The battery unit is disposed biased to one side in the left-right direction of the vehicle body frame, The work machine according to claim 3 or 4, wherein the hydraulic pump is disposed on the other side in the left-right direction of the machine frame.

6. Other electrical equipment is disposed on the battery unit, 6. The work machine according to claim 1, wherein the other electrical equipment and the electrical equipment are arranged side by side in the fore-aft direction of the machine frame.

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