Working machinery

Abstract

To suppress or prevent the effects of vibrations from the working machinery on compactly arranged equipment in the engine room. [Solution] The work machine 100 comprises a base plate 402, an electric motor 621, a hydraulic pump 701, a fan 31, and a stand 5. The electric motor 621 is supported on the base plate 402. The hydraulic pump 701 is connected to one side of the electric motor 621 in a first direction perpendicular to the vertical direction. The fan 31 is positioned above the hydraulic pump 701. The stand 5 straddles the hydraulic pump 701 and is positioned on the base plate 402 to support the fan 31.

Description

Technical Field

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

Background Art

[0002] Conventionally, a work machine that air-cools the interior of an engine room is known. For example, in the electric excavator of Patent Document 1, air is taken into the interior of the machine room through a ventilation hole provided in the side portion of the exterior cover by driving a cooling fan disposed in the machine room (i.e., the engine room) covered by an exterior cover (so-called bonnet).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a work machine such as a hydraulic excavator, in consideration of vibrations generated during work, it is necessary to arrange a plurality of devices in a limited internal space. In particular, a hydraulic pump pumps hydraulic oil to a hydraulic actuator that operates the work machine. When this hydraulic pump is mounted on an electric motor, it is necessary to arrange a fan for air-cooling the electric motor so as not to interfere with the hydraulic pump. Furthermore, it is similarly necessary to consider the arrangement of a heat exchanger or the like cooled by the fan.

[0005] In view of the above situation, an object of the present invention is to suppress or prevent the influence of vibrations during work of a work machine from reaching devices compactly arranged in the engine room.

Means for Solving the Problems

[0006] To achieve the above objective, a working machine according to one aspect of the present invention comprises a base plate, an electric motor, a hydraulic pump, a fan, and a base. The base plate extends vertically and perpendicularly. The electric motor is supported on the base plate. The hydraulic pump is connected to one side of the electric motor in a first direction perpendicular to the vertical direction. The fan is positioned above the hydraulic pump. The base is positioned on the base plate, straddling the hydraulic pump, and supports the fan.

[0007] Further features and advantages of the present invention will be further revealed by the embodiments described below. [Effects of the Invention]

[0008] According to the present invention, it is possible to suppress or prevent the effects of vibrations during the operation of a work machine from affecting compactly arranged equipment in the engine room. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic side view showing an example configuration of a hydraulic excavator according to this embodiment. [Figure 2] A schematic block diagram showing the electrical and hydraulic systems of a hydraulic excavator. [Figure 3] Cross-sectional view showing the internal structure of the engine room of a hydraulic excavator. [Figure 4] Perspective view showing an example of the arrangement of the fan, base, electric motor, and hydraulic pump on the swivel frame. [Figure 5] Front view showing an example of the arrangement of the legs and vibration-damping support members of the base, as seen from the right side. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic side view showing an example of the configuration of a hydraulic excavator 100 according to this embodiment. Figure 2 is a schematic block diagram showing the configuration of the electrical and hydraulic systems of the hydraulic excavator 100. The hydraulic excavator 100 is an example of a "working machine" of the present invention.

[0011] <1. Hydraulic Excavator 100> The hydraulic excavator 100 comprises a lower traveling body 200, a work implement 300, and an upper rotating body 400. In this embodiment, the upper rotating body 400 (particularly the engine room 404 described later) may be collectively referred to as the "machine body".

[0012] In this disclosure, direction is defined as follows. First, in the upper rotating body 400, the direction from one side of the driver's seat 4011 (described later) where the operator (driver, pilot) is seated to the other side is defined as the "forward-backward direction." Of the "forward-backward direction," the direction from the rear side of the driver's seat 4011 to the front side is defined as "forward," and the direction from the front side of the driver's seat 4011 to the rear side is defined as "rear." Therefore, when the upper rotating body 400 is not rotating relative to the lower traveling body 200 (rotation angle 0°), the forward-backward direction of the upper rotating body 400 coincides with the direction in which the lower traveling body 200 moves forward and backward. The forward-backward direction is an example of the "second direction" of the present invention. Also, "right" is an example of "one of the first directions" of the present invention, and "left" is an example of "the other of the first directions" of the present invention.

[0013] Furthermore, when viewed from the rear towards the front, the direction from one side of the driver's seat 4011 to the other is referred to as the "left-right direction." Of the left-right directions, the direction of the driver's seat 4011 toward the left is referred to as the "leftward direction," and the direction of the driver's seat 4011 toward the right is referred to as the "rightward direction." Note that the left-right direction is an example of the "first direction" of the present invention. Also, "rightward direction" is an example of "one of the first directions" of the present invention, and "leftward direction" is an example of "the other of the first directions" of the present invention.

[0014] Furthermore, the direction from one of the lower traveling body 200 and the upper rotating body 400 to the other is defined as the "up and down direction." Of the up and down directions, the direction from the lower traveling body 200 to the upper rotating body 400 is defined as "upward," and the direction from the upper rotating body 400 to the lower traveling body 200 is defined as "to the right." Therefore, when the hydraulic excavator 100 is positioned on a horizontal plane with the vertical direction as the normal direction, the up and down direction of the hydraulic excavator 100 coincides with the vertical direction. Moreover, upward coincides with the vertically upward direction, and downward coincides with the vertically downward direction. The front-to-back direction, left-to-right direction, and up and down direction are perpendicular to each other.

[0015] The above definition of direction is used solely for explanatory purposes and is not intended to limit actual positional relationships or directions.

[0016] <1-1. Lower running body 200> The lower travel body 200 comprises a pair of left and right crawlers 201 and a pair of left and right travel motors 202. Each of the travel motors 202 is a hydraulic motor. The left and right travel motors 202 drive the left and right crawlers 201 respectively, allowing the hydraulic excavator 100 to move forward and backward.

[0017] <1-2. Work Machine 300> The work machine 300 comprises a boom 301, an arm 302, and a bucket 303. By independently driving the boom 301, arm 302, and bucket 303, excavation work such as soil and sand can be performed. The boom 301 is rotated by a boom cylinder 304. The base end of the boom cylinder 304 is supported at the front of the upper slewing body 400 and is movable so as to be able to extend and retract. The arm 302 is rotated by an arm cylinder 305. The base end of the arm cylinder 305 is supported at the boom 301 and is movable so as to be able to extend and retract. The bucket 303 is rotated by a bucket cylinder 306. The base end of the bucket cylinder 306 is supported at the arm 302 and is movable so as to be able to extend and retract. The boom cylinder 304, arm cylinder 305, and bucket cylinder 306 are composed of hydraulic cylinders.

[0018] <1-3. Upper rotating body 400> The upper slewing body 400 is located above the lower traveling body 200 and is provided so as to be slewing - capable with respect to the lower traveling body 200 via a slewing bearing (not shown). In the upper slewing body 400, a control section 401, a slewing frame 402, a slewing motor 403, an engine room 404, etc. are arranged. The slewing frame 402 is an example of the "base plate" of the present invention and is in a plate - shape that spreads in a direction perpendicular to the vertical direction. On the slewing frame 402, various devices mounted on the control section 401, the slewing motor 403, and the engine room 404, etc. are mounted. The upper slewing body 400 slews via the slewing bearing by the drive of the slewing motor 403 which is a hydraulic motor.

[0019] A hydraulic pump 701 (see FIG. 2) is arranged in the upper slewing body 400. The hydraulic pump 701 is driven by an electric motor 621 (see FIG. 2). The hydraulic pump 701 supplies hydraulic oil (pressure oil) to hydraulic motors (for example, left - and - right traveling motors 202, slewing motor 403) and hydraulic cylinders (for example, boom cylinder 304, arm cylinder 305, bucket cylinder 306). The hydraulic motors and hydraulic cylinders driven by the supply of hydraulic oil from the hydraulic pump 701 are collectively called a hydraulic actuator 703 (see FIG. 2).

[0020] A driver's seat 4011 is arranged in the control section 401. Various levers 4012 are arranged around the driver's seat 4011. When an operator sits on the driver's seat 4011 and operates the lever 4012, the hydraulic actuator 703 is driven. Thereby, traveling of the lower traveling body 200, excavation work by the working machine 300, slewing of the upper slewing body 400, etc. can be performed.

[0021] Also, a battery unit 611 is arranged in the upper slewing body 400. The battery unit 611 is composed of, for example, a lithium - ion battery unit and stores electric power for driving the electric motor 621. The battery unit 611 may be configured by unitizing a plurality of batteries or may be composed of a single battery cell.

[0022] The battery unit 611 is positioned on the slewing frame 402 (see Figure 3, described later). Furthermore, preferably in this embodiment, the battery unit 611 is positioned to the left of the electric motor 61 (i.e., on the opposite side from the hydraulic pump 701). This allows the battery unit 611 to be positioned in a flexible layout without interfering with the fan 31, electric motor 621, heat exchangers 32, 33, etc., which will be described later. In addition, the mounting capacity (i.e., the amount of charge stored) of the battery unit 611 can be increased.

[0023] The upper rotating body 400 is further equipped with a lead-acid battery 628. The lead-acid battery 628 outputs a low-voltage (e.g., 12V) DC voltage. The output from the lead-acid battery 628 is supplied as a control voltage to, for example, the system controller 627 (see Figure 2), the drive unit of the fan 31, and the like.

[0024] Furthermore, the upper rotating body 400 is provided with a power supply port (not shown). The power supply port and the commercial power supply 500, which is an external power source, are connected via a power supply cable 501. This allows the hydraulic excavator 100 to charge the battery unit 611 and the lead-acid battery 628.

[0025] The hydraulic excavator 100 may be configured to use both hydraulic equipment such as a hydraulic actuator 703 and an electrically driven actuator. Examples of electrically driven actuators include an electric travel motor, an electric cylinder, and an electric slewing motor.

[0026] <1-4. Configuration of the Electrical and Hydraulic Systems> The hydraulic excavator 100 is equipped with a plurality of electrical devices 600. The plurality of electrical devices 600 include a refrigerant cooling device 610 that is cooled by heat exchange with a refrigerant, and an air cooling device 620 that is cooled by airflow. In this embodiment, the refrigerant cooling device 610 includes, for example, a battery unit 611. In this embodiment, the refrigerant is water for cooling, but is not limited to this example and may be a liquid other than water, or a cooling gas such as a non-CFC gas. The air cooling device 620 includes, for example, an electric motor 621, a charger 622, an inverter 623, a PDU (power drive unit) 624, a junction box 625, a DC-DC converter 626, a system controller 627, and a lead-acid battery 628. The above-mentioned electrical devices 600 are housed in the engine room 404.

[0027] The electric motor 621 is composed of a permanent magnet motor or an induction motor and is driven by power supplied from the battery unit 611 via the junction box 625 and inverter 623. The electric motor 621 is housed in the engine room 404 and is supported on the slewing frame 402 via vibration-damping support members 6211. In other words, the hydraulic excavator 100 further comprises vibration-damping support members 6211. The vibration-damping support members 6211 are positioned on both sides of the electric motor 621 in the front-rear direction on the slewing frame 402 and support the electric motor 621. Although the number of vibration-damping support members is three in this embodiment, it is not limited to this example and may be multiple other than three, or it may be a single member.

[0028] Furthermore, the hydraulic pump 701 is housed in the engine room 404 and connected to the right side of the electric motor 61. More specifically, the output shaft (not shown) of the electric motor 621 extends to the right from the right end of the electric motor 621. The hydraulic pump 701 is connected to the output shaft of the electric motor 621. The hydraulic pump 701 may be a variable displacement pump or a fixed displacement pump. Also, in this embodiment, there is one hydraulic pump 701. However, the hydraulic pump 701 may be multiple, but it is not limited to this example.

[0029] The hydraulic pump 701 is connected to a reservoir 705 via a hydraulic hose 704. The reservoir 705 is a working oil tank that contains (stores) hydraulic fluid. When the hydraulic pump 701 is driven by the electric motor 621, the hydraulic fluid in the reservoir 705 is supplied to the hydraulic actuator 703 via the control valve 702. This drives the hydraulic actuator 703. The control valve 702 is a directional valve that controls the flow direction and flow rate of the hydraulic fluid supplied to the hydraulic actuator 703. Thus, the hydraulic excavator 100 includes a hydraulic pump 701 that discharges hydraulic fluid when driven by one of the multiple electrical devices 600 (for example, the electric motor 621).

[0030] The charger 622, also called a power supply unit, converts the AC voltage supplied from the commercial power supply 500 (see Figure 1) via the power supply cable 501 into a DC voltage. The inverter 623 converts the DC voltage supplied from the battery unit 611 into an AC voltage and supplies it to the electric motor 621. This causes the electric motor 621 to rotate. The supply of AC voltage (current) from the inverter 623 to the electric motor 621 is performed based on a rotation command output from the system controller 627.

[0031] The PDU624 is a battery control unit that controls the input and output of the battery unit 611 by controlling the internal battery relay.

[0032] The junction box 625 includes a charger relay, an inverter relay, a fuse, and the like. The voltage output from the charger 622 is supplied to the battery unit 611 via the junction box 625 and the PDU 624. The voltage output from the battery unit 611 is supplied to the inverter 623 via the PDU 624 and the junction box 625.

[0033] The DC-DC converter 626 steps down the high-voltage (e.g., 300V) DC voltage supplied from the battery unit 611 via the junction box 625 to a low voltage (e.g., 12V). The voltage output from the DC-DC converter 626 is supplied to the system controller 627, the drive unit of the fan 31, and other components, similar to the output from the lead-acid battery 628.

[0034] The system controller 627 consists of an electronic control unit, also known as an ECU (electronic control unit), and performs electrical control of various parts of the hydraulic excavator 100.

[0035] <1-5. Internal configuration of engine room 404> Figure 3 is a cross-sectional view showing the internal structure of the engine room 404 of the hydraulic excavator 100. Figure 3 shows the cross-sectional structure of the engine room 404 virtually cut by a plane perpendicular to the vertical direction, including the dashed line III-III in Figure 1.

[0036] The hydraulic excavator 100 further comprises a bonnet 1, a ventilation section 2, a fan 31, a radiator 32, an oil cooler 33, a duct 4, and a base 5. The fan 31, radiator 32, oil cooler 33, duct 4, and base 5 are housed in the engine room 404, as shown in Figure 3.

[0037] The bonnet 1, along with the footrest 4013 and side walls 4014, 4015 of the control unit 401, the slewing frame 402, etc., is a housing that covers the engine room 404. In other words, the bonnet 1 is the outer wall of the engine room 404. The bonnet 1 has an exhaust port 11. The exhaust port 11 is an opening formed in the front and right side of the bonnet 1, connecting the inside and outside of the engine room 404. In this embodiment, a portion of the outside air taken into the engine room 404 from the ventilation section 2 through the duct 4 is discharged to the outside through the exhaust port 11.

[0038] The ventilation section 2 is located on the bonnet 1 and connects the inside and outside of the engine room 404, allowing for ventilation. The rotation of the fan 31 draws outside air into the engine room 404 through the ventilation section 2. In this embodiment, the ventilation section 2 is located on the right side of the bonnet 1. However, this example does not exclude configurations where the ventilation section 2 is located in a position other than the right side of the bonnet 1.

[0039] The fan 31 is positioned above the electric motor 61 and hydraulic pump 701 within the engine room 404 and takes in outside air through the ventilation section 2. The fan 31 is rotatably supported within the duct 4 around a rotation axis CA that extends in the left-right direction. The fan 31 in this embodiment is a suction type. Therefore, when the fan 31 is rotated, outside air passing through the ventilation section 2 is drawn into the duct 4 and flows into the engine room 404.

[0040] The radiator 32 is an example of the "first heat exchanger" of the present invention, and is positioned between the ventilation section 2 and the fan 31 within the duct 4. It cools the refrigerant by heat exchange with the outside air (air) taken in by the ventilation section 2. The refrigerant to be cooled is for the electrical equipment 600 in the engine room 404. For example, the refrigerant is supplied from the radiator 32 to refrigerant cooling equipment 610 such as the battery unit 611, and cools the refrigerant cooling equipment 610.

[0041] The oil cooler 33 is an example of the "second heat exchanger" of the present invention and is connected to the oil passage through which the working oil circulates via the hydraulic pump 701 and the hydraulic actuator 703 (see Figure 2). The oil cooler 33 cools the working oil circulating in the oil passage by the hydraulic pump 701 through heat exchange with the outside air (air) taken in at the ventilation section 2.

[0042] Duct 4 is a flow path through which outside air taken in from the ventilation section 2 flows. Duct 4 has a frame shape with openings at both ends in the left and right directions and extends in the left and right directions. One end of duct 4 is positioned upstream of the fan 31 in the outside air flow and opens facing the ventilation section 2. One end of duct 4 (one end 411 of the first flow path section 41, described later) is an example of the "upstream opening" of the present invention and is connected to the ventilation section 2. The other end of duct 4 (for example, the second opening 422 and the fourth opening 432, described later) opens into the engine room 404. The fan 31, radiator 32, and oil cooler 33 are located inside duct 4. More specifically, they are located in the middle of the outside air flow path within duct 4. In addition, an inverter 623 and the like are installed in the part of duct 4 to the left of the fan 31 (i.e., downstream of the outside air flow) (for example, the second flow path section 42, described later). Below the duct 4, a portion of the electric motor 621 and the hydraulic pump 701 are positioned. In addition, as shown in Figure 3, the charger 622 is positioned behind the duct 4 and the hydraulic pump 701.

[0043] The base 5 is housed in the engine room 404 and is positioned on the slewing frame 402, straddling the hydraulic pump 701, to support the fan 31. According to the hydraulic excavator 100 of this embodiment, the fan 31 is supported above the hydraulic pump 701 by the base 5, which straddles the hydraulic pump 701 connected to the electric motor 61. Therefore, the fan 31 can be stably positioned vertically, away from the slewing frame 402 and the hydraulic pump 701. Thus, the hydraulic excavator 100 can suppress or prevent the effects of vibration during operation from affecting the compactly arranged equipment (especially the fan 31) in the engine room 404.

[0044] Preferably, the base 5 further supports at least one of the heat exchangers of the radiator 32 and the oil cooler 33. In this embodiment, the base 5 supports both (see Figures 3 and 4). In this way, at least one of the heat exchangers of the radiator 32 and the oil cooler 33 can be supported by the base 5, on which the legs 52 (described later) are erected on the swivel frame 402. Thus, at least one of the heat exchangers 32 and 33 can be stably positioned together with the fan 31. However, this example does not exclude configurations in which the base 5 does not support both the radiator 32 and the oil cooler 33. For example, the base 5 may support only the fan 31.

[0045] <1-5-1. Example of the configuration of base section 5> Next, an example of the configuration of the base 5 will be described with reference to Figures 4 and 5. Figure 4 is a perspective view showing an example of the arrangement of the fan 31, base 5, electric motor 621, and hydraulic pump 701 on the swivel frame 402. Figure 5 is a front view showing an example of the arrangement of the legs 52 of the base 5 and the vibration-damping support member 6211 of the electric motor 621, as seen from the right side.

[0046] As shown in Figure 4, the base portion 5 has a holding plate portion 51 and a plurality of leg portions 52.

[0047] The retaining plate portion 51 is plate-shaped and extends in a direction intersecting (for example, perpendicular to) the vertical direction, and holds the fan 31. For example, the fan 31 is fixed on the retaining plate portion 51. In this embodiment, both the radiator 32 and the oil cooler 33 are also fixed on the retaining plate portion 51. However, this example does not exclude configurations in which at least one of the radiator 32 and the oil cooler 33 is not fixed on the retaining plate portion 51.

[0048] Multiple legs 52 are erected on the swivel frame 402 to support the holding plate portion 51. In this embodiment, there are three legs 52, but the number is not limited to this example and may be more than three. This example does not exclude a configuration in which there is only one leg 52.

[0049] Regarding the arrangement of the multiple legs 52, preferably, the hydraulic pump 701 is positioned between some of the legs 52 and other parts of the legs 52 in the front-rear direction. Each leg 52 does not come into contact with the hydraulic pump 701. For example, in Figure 4, specifically, two legs 52 are positioned in front of the hydraulic pump 701, and a single leg 52 is positioned behind the hydraulic pump 701. This positions the hydraulic pump 701 between some of the legs 52 and other parts of the legs 52 in the front-rear direction. This allows for effective use of the space between the legs 52 aligned in the front-rear direction. Furthermore, since the legs 52 can be positioned close to the hydraulic pump 701, the front-rear size of the base 5 can be reduced. Therefore, the base 5 can be constructed compactly. However, this example does not exclude configurations where all legs 52 are positioned either in front of or behind the hydraulic pump 701.

[0050] Preferably, in a plan view from above, each leg 52 is positioned outside the electric motor 621. For example, each leg 52 does not come into contact with the electric motor 621, nor is it erected away from the electric motor 621. This allows the legs 52 of the base 5 to be positioned away from the electric motor 621, making it difficult for vibrations of the hydraulic pump 701 via the electric motor 621, vibrations of the electric motor 621 itself, etc., to be transmitted to the base 5. Therefore, the hydraulic excavator 100 can suppress or prevent vibrations during operation from affecting the fan 31.

[0051] Furthermore, preferably as shown in Figure 4, in a plan view from above, the multiple legs 52 are positioned to the right of the electric motor 621. By converging the multiple legs 52 to the right of the electric motor 61, a compact arrangement can be achieved.

[0052] Preferably, the legs 52 are arranged on both sides in the front-rear direction of the connection portion 6210 between the electric motor 621 and the hydraulic pump 701. At the connection portion 6210, the output shaft of the electric motor 61 is connected to the hydraulic pump 701. Therefore, the outer diameter (i.e., the size in the front-rear direction) of the connection portion 6210 is smaller than the size of the electric motor 621 and the hydraulic pump 701 in the front-rear direction. Thus, the legs 52 on both sides of the connection portion 6210 in the front-rear direction can be placed close together, reducing the distance between them. As a result, multiple legs 52 can be arranged compactly. However, this example does not exclude a configuration in which the legs 52 are arranged on only one side in the front-rear direction of the connection portion 6210.

[0053] Preferably, as shown in Figure 5, the front end of each leg 52 is positioned forward of the rear end of the electric motor 61. Furthermore, the rear end of each leg 52 is positioned rearward of the front end of the electric motor 61. In other words, when viewed from the left and right, at least a portion of each leg 52 should overlap with the electric motor 621 in the left-right direction. This reduces the spacing between the legs 52 on both sides of the hydraulic pump 701 in the front-rear direction. This allows multiple legs 52 to be arranged compactly. However, this example does not exclude a configuration in which the front end of at least one leg 52 is positioned rearward of the rear end of the electric motor 621, nor does it exclude a configuration in which the rear end of at least one leg 52 is positioned forward of the front end of the electric motor 621.

[0054] Preferably, as shown in Figure 5, the front end of each leg 52 is positioned forward of the rear end of the vibration-damping support member 6211 located behind the electric motor 61. Furthermore, the rear end of each leg 52 is positioned behind the front end of the vibration-damping support member 6211 located in front of the electric motor 61. In other words, when viewed from the left and right, at least a portion of the leg 52 positioned in front of the hydraulic pump 701 only needs to overlap with the vibration-damping support member 6211 positioned in front of the electric motor 621 in the left and right direction, or be located behind it. Furthermore, at least a portion of the leg 52 positioned behind the hydraulic pump 701 only needs to overlap with the vibration-damping support member 6211 positioned behind the electric motor 621 in the left and right direction, or be located in front of it. This allows multiple leg 52 to be arranged compactly. However, this example does not exclude a configuration in which the front end of at least one leg 52 is positioned further rear than the rear end of the vibration-damping support member 6211 which is positioned on the rear side of the electric motor 621, nor does it exclude a configuration in which the rear end of at least one leg 52 is positioned further forward than the front end of the vibration-damping support member 6211 which is positioned on the front side of the electric motor 621.

[0055] <1-5-2. Arrangement of Radiator 32> As shown in Figure 3, the radiator 32 is positioned to the right of the fan 31 (i.e., on the side of the ventilation section 2). In other words, the radiator 32 is positioned upstream of the fan 31 in the direction of the airflow drawn in from the ventilation section 2 by the rotation of the fan 31. Furthermore, when viewed from the left and right, the radiator 32 covers one side of the fan 31 (for example, the rear side).

[0056] For example, in this embodiment, upstream of the fan 31 from the outside air, the rear portion of the fan 31 directly faces the radiator 32 in the left-right direction. The front portion of the fan 31 directly faces the vent 2 in the left-right direction. The "rear portion" of the fan 31 is an example of the "first portion (of the fan)" of the present invention. The "front portion" of the fan 31 is an example of the "second portion (of the fan)" of the present invention. In other words, the radiator 32 faces the rear portion of the fan 31 in the left-right direction, while not facing at least a part of the front portion of the fan 31 in the left-right direction. With the radiator 32 arranged as described above, only a portion of the outside air taken in from the vent 2 can be used for heat exchange in the radiator 32.

[0057] <1-5-3. Arrangement of Oil Cooler 33> As shown in Figure 3, the oil cooler 33 is positioned to the left of the fan 31 (i.e., on the opposite side from the ventilation section 2). In other words, the oil cooler 33 is positioned downstream of the fan 31 in the direction of the outside air flow taken in from the ventilation section 2. Furthermore, when viewed from the left and right, the oil cooler 33 is covered by the other side portion of the fan 31 (for example, the front portion).

[0058] The oil cooler 33 is positioned between the portion of the fan 31 that directly faces the ventilation section 2 (the front portion) and the inlet for outside air in the third flow path section 43 of the duct 4 (the third opening 431, described later). For example, in this embodiment, downstream of the fan 31, the front portion of the fan 31 directly faces the oil cooler 33 in the left-right direction. The rear portion of the fan 31 directly faces the first opening 421 of the second flow path section 42, described later, in the left-right direction. In other words, the oil cooler 33 faces the front portion of the fan 31 in the left-right direction, while not facing at least a portion of the rear portion of the fan 31 in the left-right direction. With the oil cooler 33 positioned as described above, the remaining portion of the outside air taken in from the ventilation section 2 can be used for heat exchange in the oil cooler 33.

[0059] <1-5-4. Arrangement of fan 31, radiator 32, and oil cooler 33> Furthermore, with the arrangement of the radiator 32 and oil cooler 33 relative to the fan 31 as described above, the hydraulic excavator 100 can divide the outside air taken into the engine room 404 by the rotation of a single fan 31 into two airflows.

[0060] One airflow, after hitting the radiator 32, flows through the rear portion of the fan 31 to the second flow path 42 of the duct 4, which will be described later. Therefore, the radiator 32 can cool the refrigerant supplied to the refrigerant cooling equipment 610 through heat exchange with the aforementioned one airflow.

[0061] The other airflow passes through the front portion of the fan 31 and hits the oil cooler 33, and then flows into the third flow path section 43 of the duct 4, which will be described later. Therefore, the oil cooler 33 can cool the working oil circulating through the oil passages via the hydraulic pump 701 and hydraulic actuator 703 (see Figure 2) by heat exchange with the other airflow mentioned above.

[0062] Thus, in this embodiment, the outside air taken in by the ventilation section 2 can cool the radiator 32 and the oil cooler 33 individually and flow through different passages (i.e., the second passage section 42 and the third passage section 43). This suppresses or prevents one of the airflows from passing through the radiator 32 from the outside air taken in from the ventilation section 2 from hitting the oil cooler 33. Therefore, it is possible to suppress or prevent the airflow whose temperature has risen due to heat exchange in the radiator 32 from hitting the oil cooler 33. Furthermore, the other airflow hits the oil cooler 33 without passing through the radiator 32. Therefore, an airflow with a temperature similar to that of the outside air can be directed to the oil cooler 33. Consequently, the oil cooler 33 can cool the working oil more effectively, that is, the temperature of the working oil can be lowered through heat exchange with the airflow as described above. Furthermore, compared to a configuration in which cooling fans are individually placed on the radiator 32 and oil cooler 33, the cooling structure of the radiator 32 and oil cooler 33 can be realized in a more compact layout suitable for a small hydraulic excavator 100.

[0063] <1-6. Duct 4> Next, an example of the configuration of the duct 4 will be described. As shown in Figure 3, the duct 4 of the hydraulic excavator 100 has a first flow path section 41, a second flow path section 42, and a third flow path section 43.

[0064] In the first flow path section 41, outside air is drawn in from the ventilation section 2 and flows toward the fan 31. One end 411 of the first flow path section 41 is connected to the ventilation section 2 and is connected to the outside of the hydraulic excavator 100 (particularly the engine room 404) through the opening 21. The fan 31 is located at the other end of the first flow path section 41.

[0065] Furthermore, in this embodiment, the duct 4 further includes a cover portion 412. The cover portion 412 covers the upper surface of the retaining plate portion 51 of the base portion 5 and, together with the retaining plate portion 51, constitutes the first flow path portion 41. In other words, the retaining plate portion 51 is part (bottom) of the first flow path portion 41. However, the embodiment is not limited to this example, and the retaining plate portion 51 does not have to be part of the first flow path portion 41. For example, the retaining plate portion 51 may be placed on the retaining plate portion 51. In other words, at least the first flow path portion 41 in which the fan 31 is located may be supported by the base portion 5.

[0066] Furthermore, the flow path of the duct 4 to the left of the fan 31 (opposite the ventilation section 2) is separated by a partition plate 44. As a result, the two flow paths are aligned in the front-to-back direction. The second flow path 42 is the rear of the two flow paths, and airflow passes through the rear part of the fan 31. The third flow path 43 is the front of the two flow paths, and airflow passes through the front part of the fan 31.

[0067] The second flow path section 42 guides relatively low-temperature outside air (airflow) that has undergone heat exchange in the radiator 32 to air-cooled equipment 620 such as the electric motor 621. The second flow path section 42 has a first opening 421 and a second opening 422. The first opening 421 is the upstream end of the outside air in the second flow path section 42 and opens to the right. The first opening 421 is connected to the other end of the first flow path section 41 and faces the rear portion of the fan 31 in the left-right direction. The second opening 422 is the downstream end of the outside air in the second flow path section 42. The second opening 422 is an example of the "downstream opening" of the present invention and is located downstream of the outside air from the fan 31, opening overlooking the top of the electric motor 621. For example, in this embodiment, the upper surface of the second flow path section 42 slopes downward as it moves to the left. Therefore, the left portion of the second flow path section 42 curves downward. As a result, the second opening 422 opens downwards and faces the electric motor 621 in the vertical direction. This allows the electric motor 621 to be cooled in a compact layout. However, the shape of the second flow path 42 is not limited to the shape described above.

[0068] For example, some of the outside air taken in from the ventilation section 2 comes into contact with the radiator 32, which cools the refrigerant such as water. This outside air becomes a relatively cool airflow through heat exchange with the radiator 32, passes through the rear part of the fan 31, and flows into the first opening 421 of the second flow path section 42. In other words, this outside air bypasses the oil cooler 33 (i.e., passes outside the oil cooler 33) and flows into the interior of the second flow path section 42.

[0069] In this embodiment, the front portion of the inverter 623 is positioned on the rear side of the second flow path section 42. This allows the inverter 623 to be efficiently air-cooled by the relatively low-temperature airflow circulating inside the second flow path section 42.

[0070] Furthermore, in this embodiment, the second opening 422 faces the electric motor 621 in the vertical direction. Therefore, the relatively low-temperature airflow circulating inside the second flow path 42 is sent out from the second opening 422 toward the electric motor 621 and directly hits the electric motor 621. This improves the cooling efficiency of the electric motor 621.

[0071] Furthermore, in this embodiment, some air-cooled equipment 620, such as the charger 622, are arranged around the second flow path 42. The second opening 422 opens toward the space where the electrical equipment 600 is arranged, and is connected to that space. Therefore, the relatively low-temperature airflow discharged from the second opening 422 can air-cool not only the electric motor 621 but also other air-cooled equipment 620 (charger 622, the rear part of the inverter 623, PDU 624, junction box 625, DC-DC converter 626, system controller 627, etc.) and refrigerant-cooled equipment 610 such as the battery unit 611. Consequently, the cooling efficiency of the electrical equipment 600 is further improved.

[0072] Furthermore, in this embodiment, the refrigerant cooling equipment 610 (particularly the battery unit 611) is positioned near the second flow path section 42 (particularly the second opening 422). This allows the hydraulic excavator 100 to cool both the refrigerant cooling equipment 610 and the multiple air-cooled equipment 620 while arranging them compactly. Consequently, the hydraulic excavator 100 can efficiently cool the electrical equipment 600 while making effective use of the limited space in the engine room 404.

[0073] The third flow path section 43 is an example of the "flow path section" of the present invention, and guides the relatively high-temperature outside air (airflow) that has been heat-exchanged in the oil cooler 33 to the exhaust port 11 located on the bonnet 1. The third flow path section 43 has a third opening 431 and a fourth opening 432. The third opening 431 is the upstream end of the outside air in the third flow path section 43, and is aligned in the front-rear direction with the first opening 421 of the second flow path section 42, separated by a partition plate 44, and opens to the right. The third opening 431 is connected to the other end of the first flow path section 41 and faces the front part of the fan 31 in the left-right direction. The fourth opening 432 is the downstream end of the outside air in the third flow path section 43. The rear side of the third flow path section 43 (i.e., the partition plate 44) slopes forward as it moves to the left. Therefore, the left side of the third flow path section 43 curves forward. As a result, the fourth opening 432 opens forward. However, the shape of the third flow channel 43 is not limited to the shape described above.

[0074] Furthermore, an oil cooler 33 is positioned in the third flow path section 43. In this embodiment, as shown in Figure 3, at least a portion of the oil cooler 33 is positioned within the third opening 431 (i.e., the upstream end of the third flow path section 43) and covers the third opening 431.

[0075] In this way, some of the remaining outside air taken in through the opening 21 bypasses the radiator 32 (i.e., passes outside the radiator 32), goes from the opening 21 through the front side of the fan 31, and hits the oil cooler 33 that cools the working oil. This outside air becomes a relatively hot airflow due to heat exchange in the oil cooler 33, flows inside the third flow path section 43, and is discharged forward through the fourth opening 432.

[0076] Furthermore, the airflow discharged forward from the fourth opening 432 does not circulate within the engine compartment 404, but is instead discharged to the outside, for example, from the exhaust port 11 located on the front part of the bonnet 1. This suppresses the rise in internal temperature of the engine compartment 404 and prevents or inhibits the relatively high-temperature airflow from hitting the electrical equipment 600.

[0077] However, the oil cooler 33 may be located inside the third flow path section 43, away from the third opening 431, although it is not limited to the examples given above. Alternatively, the oil cooler 33 may cover either the third opening 431 or the fourth opening 432 outside the third flow path section 43, or it may be located outside the third flow path section 43, near either the third opening 431 or the fourth opening 432.

[0078] <2. Remarks> The embodiments of the present invention have been described above. It should be noted that the embodiments described above are illustrative, and various modifications are possible in the combination of each component and each process, and this will be understood by those skilled in the art as being within the scope of the present invention.

[0079] For example, in the embodiments described above, a hydraulic excavator 100, which is a construction machine, was used as an example of the "working machine" of the present invention. However, this example does not exclude configurations in which the present invention can be applied to working machines other than the hydraulic excavator 100. For example, the "working machine" of the present invention may be other construction machines such as a wheel loader, or agricultural machines such as a combine harvester or tractor.

[0080] <3. Summary> The embodiments described so far will be summarized below.

[0081] For example, the work machine 100 disclosed herein is A base plate 402 that extends vertically and vertically, An electric motor 621 supported on the base plate 402, A hydraulic pump 701 is connected to one side (for example, the right side) of the electric motor 621 in a first direction perpendicular to the vertical direction, A fan 31 is positioned above the hydraulic pump 701, A base portion 5 is positioned on the base plate 402, straddling the hydraulic pump 701, and supporting the fan 31. This configuration (first configuration) includes the following:

[0082] The work machine 100 of the first configuration described above is The base portion 5 is The retaining plate portion 51 that holds the fan 31, A plurality of legs 52 are erected on the base plate 402 and support the holding plate portion 51, It has, The hydraulic pump 701 may be configured to be positioned between some of the legs 52 and other parts of the legs 52 in the vertical direction and a second direction perpendicular to the first direction (for example, the front-to-back direction) (second configuration).

[0083] The work machine 100 with the second configuration described above is In a plan view from above, each of the legs 52 may be positioned outside the electric motor 621 (third configuration).

[0084] Furthermore, the work machine 100 having the second or third configuration described above, In a plan view from above, the multiple legs 52 may be arranged on one side (for example, to the right) of the electric motor 621 in the first direction (fourth configuration).

[0085] Furthermore, the work machine 100 having any of the second to fourth configurations described above, The leg portions 52 may be arranged on both sides of the connection portion 6210 between the electric motor 621 and the hydraulic pump 701 in the second direction (for example, the front-to-back direction) (fifth configuration).

[0086] Furthermore, the work machine 100 having any of the second to fifth configurations described above is: One end of each of the leg portions 52 in the second direction (for example, the front end) is positioned to one side (for example, forward) of the other end of the electric motor 621 in the second direction (for example, the rear end). The other end (for example, the rear end) of each leg portion 52 in the second direction may be positioned further to the other side (for example, the rear end) than one end (for example, the front end) of the electric motor 621 in the second direction (for example, the front end) (sixth configuration).

[0087] Furthermore, the work machine 100 having any of the second to sixth configurations described above is: The base plate 402 further comprises vibration-damping support members 6211 arranged on both sides of the electric motor 621 in the second direction (for example, the front-rear direction) and supporting the electric motor 621, The multiple legs 52 may be arranged in a configuration (seventh configuration) such that they are positioned on the other side (for example, the left side) of the vibration-damping support member 6211 on one side (for example, the right side) in the second direction, and on one side (for example, the right side) of the vibration-damping support member 6211 on the other side (for example, the left side) in the second direction.

[0088] Furthermore, the work machine 100 having any of the above configurations 1 to 7 is, The configuration may further include a battery unit 611 positioned on the base plate 402 to the other side (for example, to the left) of the electric motor 621 in the first direction (e.g., to the left) (eighth configuration).

[0089] Furthermore, the work machine 100 having any of the above configurations 1 to 8 is, The bonnet 1 encloses the engine compartment 404, which houses the electric motor 621, the hydraulic pump 701, the base 5, and the fan 31, together with the base plate 402, A ventilation section 2 is provided on the bonnet 1 to allow ventilation between the inside and outside of the engine compartment 404, A duct 4 through which the fan 31 is located and outside air taken in from the ventilation section 2 flows, Furthermore, The aforementioned duct 4 is An upstream opening 411 is positioned upstream of the fan 31 and faces the ventilation section 2, A downstream opening 422 is positioned downstream of the fan 31 from the outside air and opens over the top of the electric motor 621, This also refers to a configuration having (the ninth configuration).

[0090] Furthermore, the work machine 100 of the ninth configuration described above is The duct 4 further comprises a first heat exchanger 32 positioned between the ventilation section 2 and the fan 31 to cool the refrigerant for the electrical equipment 600 in the engine room 404 with the outside air. The first portion of the fan 31 faces the first heat exchanger 32 directly, The second portion of the fan 31 may be configured to directly face the ventilation portion 2 (the tenth configuration).

[0091] Furthermore, the work machine 100 having the ninth or tenth configuration described above is A second heat exchanger 33 is positioned downstream of the fan 31 from the outside air and cools the working oil circulating through the oil passage by the hydraulic pump 701 with the outside air. A flow path section 43 guides the outside air, whose heat has been exchanged in the second heat exchanger 33, to the exhaust port 11 located in the bonnet 1, Furthermore, The second heat exchanger 33 may be configured to be positioned between the portion of the fan 31 that directly faces the ventilation portion 2 and the outside air inlet 431 in the flow path portion 43 (the 11th configuration).

[0092] Furthermore, the work machine 100 having any of the above configurations 9 to 11 is, A first heat exchanger 32 is located within the duct 4 and cools the refrigerant for the electrical equipment 600 in the engine room 404 with some of the outside air, A second heat exchanger 33 is located within the duct 4 and cools the working oil circulating through the oil passage by the hydraulic pump 701 with the outside air. Furthermore, The base portion 5 may also be configured to further support at least one of the heat exchangers, the first heat exchanger 32 and the second heat exchanger 33 (the twelfth configuration). [Industrial applicability]

[0093] This invention can be used, for example, in work machinery such as construction machinery and agricultural machinery. [Explanation of Symbols]

[0094] 100... Hydraulic excavator (working machine), 200... Lower travel body, 201... Crawler, 202... Travel motor, 230... Plate section, 231... Upper plate section, 232... Lower plate section, 300... Working machine, 301... Boom, 302... Arm, 303... Bucket, 304... Boom cylinder, 305... Arm cylinder, 306... Bucket cylinder, 400... Upper slewing body, 401... Control unit, 4011... Operation Shift seat, 4012...Lever, 4013...Step stool, 4014, 4015...Side wall section, 402...Slewing frame (base plate), 403...Slewing motor, 404...Engine room, 500...Commercial power supply, 501...Power supply cable, 600...Electrical equipment, 610...Refrigerant cooling equipment, 611...Battery unit, 620...Air cooling equipment, 621...Electric motor, 6210...Connection section, 6211...Vibration-damping support member, 6 22... Charger, 623... Inverter, 624... PDU, 625... Junction box, 626... DC-DC converter, 627... System controller, 628... Lead-acid battery, 701... Hydraulic pump, 702... Control valve, 703... Hydraulic actuator, 704... Hydraulic hose, 705... Reservoir, 1... Bonnet, 11... Exhaust port, 2... Ventilation port, 31... Fa 32...Radiator (first heat exchanger), 33...Oil cooler (second heat exchanger), 4...Duct, 41...First flow path section, 411...One end, 412...Cover section, 42...Second flow path section, 421...First opening, 422...Second opening, 43...Third flow path section (flow path section), 431...Third opening, 432...Fourth opening, 44...Partition plate, 5...Base section, 51...Holding plate section, 52...Legs, CA...Rotating shaft

Claims

1. A base plate that extends vertically and vertically, An electric motor supported on the base plate, A hydraulic pump connected to one side of the electric motor in a first direction perpendicular to the vertical direction, A fan positioned above the aforementioned hydraulic pump, A base portion that straddles the hydraulic pump and is positioned on the base plate to support the fan, A work machine equipped with the following features.

2. The aforementioned base portion is The retaining plate portion that holds the fan, A plurality of legs erected on the base plate and supporting the holding plate portion, It has, The work machine according to claim 1, wherein the hydraulic pump is positioned between some of the legs and other parts of the legs in the vertical direction and in a second direction perpendicular to the first direction.

3. The work machine according to claim 2, wherein, in a plan view from above, each of the legs is positioned outside the electric motor.

4. The work machine according to claim 2, wherein, in a plan view from above, the plurality of legs are arranged on one side in the first direction relative to the electric motor.

5. The work machine according to claim 2, wherein the legs are arranged on both sides in the second direction of the connection between the electric motor and the hydraulic pump.

6. One end of each of the aforementioned legs in the second direction is positioned to one side of the other end of the electric motor in the second direction. The working machine according to claim 2, wherein the other end of each leg in the second direction is positioned on the other side of the one end of the electric motor in the second direction.

7. The base plate further comprises vibration-damping support members arranged on both sides of the electric motor in the second direction and supporting the electric motor, The work machine according to claim 2, wherein the plurality of legs are arranged on the other side of the vibration-damping support member on one side in the second direction, and on one side of the vibration-damping support member on the other side in the second direction.

8. The work machine according to claim 1, further comprising a battery unit positioned on the base plate on the other side of the first direction from the electric motor.

9. A bonnet encloses the engine compartment, which houses the electric motor, the hydraulic pump, the base, and the fan, together with the base plate, A ventilation section is provided on the bonnet to allow ventilation between the inside and outside of the engine compartment, A duct through which the fan is located and outside air taken in from the ventilation section flows, Furthermore, The aforementioned duct is, An upstream opening positioned upstream of the fan and facing the ventilation section, A downstream opening is positioned downstream of the fan from the outside air and opens over the top of the electric motor, A work machine according to any one of claims 1 to 8, having the following features.

10. The duct further comprises a first heat exchanger positioned between the ventilation section and the fan, which cools the refrigerant for the electrical equipment in the engine room with the outside air. The first part of the fan faces directly opposite the first heat exchanger, The working machine according to claim 9, wherein the second part of the fan is directly opposite the ventilation section.

11. A second heat exchanger is positioned downstream of the fan from the outside air and cools the working oil circulating through the oil passage by the hydraulic pump with the outside air. A flow path section that guides the outside air, whose heat has been exchanged in the second heat exchanger, to an exhaust port located on the bonnet, Furthermore, The working machine according to claim 9, wherein the second heat exchanger is disposed between the portion of the fan that directly faces the vent portion and the inlet of the outside air in the flow path portion.

12. A first heat exchanger is placed in the duct and cools the refrigerant for the electrical equipment in the engine room with some of the outside air. A second heat exchanger is located within the duct and cools the working oil, which is circulated through the oil passage by the hydraulic pump, with the outside air. Furthermore, The work machine according to claim 9, wherein the base further supports at least one of the first heat exchanger and the second heat exchanger.

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