Work machine

Abstract

The invention provides a work machine, which can suppress or prevent the influence of vibration during work of the work machine from affecting a compactly arranged device in an internal combustion engine chamber. A work machine (100) is provided with a base plate (402), an electric motor (621), a hydraulic pump (701), a fan (31), and a base part (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 disposed above the hydraulic pump (701). The base section (5) is disposed on the base plate (402) across the hydraulic pump (701), and supports the fan (31).

Description

Technical Field

[0001] This invention relates to a work machine. Background Technology

[0002] Previously, it was known to operate machinery that air-cooled the interior of the internal combustion engine compartment. For example, regarding the electric excavator of Patent Document 1, air was drawn into the interior of the machine compartment (i.e., the internal combustion engine compartment) from a vent located on the side of the outer cover by a cooling fan configured inside the machine compartment (i.e., the machine compartment) covered by an outer cover (so-called engine cover).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-020294 Summary of the Invention

[0006] However, for construction machinery such as hydraulic excavators, considering the vibrations generated during operation, multiple devices, especially hydraulic pumps, need to be installed within the limited internal space to deliver hydraulic pressure to the hydraulic actuators that cause the machinery to move. When this hydraulic pump is mounted on an electric motor, the fan used for air cooling the electric motor must be configured so as not to interfere with the hydraulic pump. Furthermore, the configuration of the heat exchanger and other components cooled by the fan also needs to be considered.

[0007] In view of the above, the object of the present invention is a device for suppressing or preventing the effects of vibrations from the operation of machinery from affecting the compact configuration of the internal combustion engine compartment.

[0008] To achieve the above objectives, one aspect of the present invention relates to a working machine comprising a base plate, an electric motor, a hydraulic pump, a fan, and a base. The base plate extends perpendicularly to the vertical direction. 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 configured to be positioned higher than the hydraulic pump. The base is disposed on the base plate across the hydraulic pump and supports the fan.

[0009] Other features and advantages of the present invention become more apparent through the following embodiments.

[0010] Invention Effects

[0011] According to the present invention, a compactly arranged device is capable of suppressing or preventing the effects of vibrations during the operation of machinery from affecting the internal combustion engine compartment. Attached Figure Description

[0012] Figure 1This is a schematic side view showing a structural example of the hydraulic excavator according to this embodiment.

[0013] Figure 2 It is a block diagram schematically showing the structure of the electrical and hydraulic systems of a hydraulic excavator.

[0014] Figure 3 This is a cross-sectional view showing the internal structure of the internal combustion engine compartment of a hydraulic excavator.

[0015] Figure 4 This is a perspective view showing an example of the configuration of the fan, base, electric motor, and hydraulic pump relative to the rotating frame.

[0016] Figure 5 This is a front view showing an example of the configuration of the legs and vibration damping support components of the base section, viewed from the right side.

[0017] Explanation of reference numerals in the attached figures

[0018] 100…Hydraulic excavator (operating machinery); 200…Undercarriage; 201…Tracks; 202…Travel motor; 300…Working machine; 301…Boom; 302…Stick; 303…Bucket; 304…Boom cylinder; 305…Stick cylinder; 306…Bucket cylinder; 400…Upper slewing body; 401…Control unit; 4011…Driver's seat; 4012…Lever; 4013…Foot pedal; 40 14, 4015…Side wall portion; 402…Slewing frame (base plate); 403…Slewing motor; 404…Internal combustion engine compartment; 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…Connecting part; 6211…Vibration damping support component; 622…Charger; 6 23…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…Engine cover; 11…Exhaust port; 2…Ventilation section; 31…Fan; 32…Radiator (first heat exchanger); 33…Oil cooler (second heat exchanger); 4…Pipe; 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…Retaining plate section; 52…Leg section; CA…Rotating shaft. Detailed Implementation

[0019] The embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1This is a schematic side view showing a structural example of the hydraulic excavator 100 according to this embodiment. Figure 2 This is a block diagram schematically illustrating the structure of the electrical and hydraulic systems of a hydraulic excavator 100. The hydraulic excavator 100 is an example of the "operating machinery" of this invention.

[0020] <1. Hydraulic Excavator 100>

[0021] The hydraulic excavator 100 includes a lower traveling body 200, a working body 300, and an upper slewing body 400. In addition, in this embodiment, the upper slewing body 400 (especially the internal combustion engine compartment 404 described later) is sometimes referred to as the "body".

[0022] Furthermore, the directions in this disclosure are defined as follows. First, regarding the upper rotating body 400, the direction from one side of the front and back sides of the driver's seat 4011 (described later) where the operator (manipulator, driver) sits, towards the other side, is defined as the "front-rear direction." Within the "front-rear direction," the direction from the back side of the driver's seat 4011 towards the front side is defined as "forward," and the direction from the front side of the driver's seat 4011 towards the back side is defined as "rearward." Therefore, when the upper rotating body 400 is not rotated relative to the lower traveling body 200 (rotation angle is 0°), the front-rear direction of the upper rotating body 400 is consistent with the forward and backward direction of the lower traveling body 200. Furthermore, the front-rear direction is an example of the "second direction" of this invention. Additionally, "forward" is an example of "one side of the second direction" of this invention, and "rearward" is an example of "the other side of the second direction" of this invention.

[0023] Furthermore, when viewing the front from the rear, the direction from one side of the driver's seat 4011 to the other is defined as the "left-right direction". Within the left-right direction, the direction towards the left side of the driver's seat 4011 is defined as "left side", and the direction towards the right side of the driver's seat 4011 is defined as "right side". Moreover, the left-right direction is an example of the "first direction" of this invention. Additionally, "right side" is an example of "one side of the first direction" of this invention, and "left side" is an example of "the other side of the first direction" of this invention.

[0024] Furthermore, the direction from one of the lower traveling body 200 and the upper rotating body 400 towards the other is defined as the "vertical direction". Within the vertical direction, the direction from the lower traveling body 200 towards the upper rotating body 400 is defined as "upper", and the direction from the upper rotating body 400 towards the lower traveling body 200 is defined as "lower". Therefore, when the hydraulic excavator 100 is positioned on a horizontal plane with the vertical direction as its normal, its vertical direction is consistent with the vertical direction. Furthermore, "upper" is consistent with "vertically upper", and "lower" is consistent with "vertically lower". The forward / backward, left / right, and vertical directions are perpendicular to each other.

[0025] Furthermore, the above definitions of direction are for illustrative purposes only and are not intended to limit actual positional relationships and directions.

[0026] <1-1. Lower Driving Body 200>

[0027] The lower traveling body 200 has a pair of left and right tracks 201 and a pair of left and right travel motors 202. Each travel motor 202 is a hydraulic motor. The left and right travel motors 202 drive the left and right tracks 201 respectively, enabling the hydraulic excavator 100 to move forward and backward in the front-rear direction.

[0028] <1-2. Worker 300>

[0029] The work machine 300 includes a boom 301, a stick 302, and a bucket 303. It can perform excavation operations such as digging sand and soil by independently driving the boom 301, stick 302, and bucket 303. The boom 301 is rotated using a boom cylinder 304. The base end of the boom cylinder 304 is supported on the front of the upper rotating body 400 and can move freely telescopically. The stick 302 is rotated using a stick cylinder 305. The base end of the stick cylinder 305 is supported on the boom 301 and can move freely telescopically. The bucket 303 is rotated using a bucket cylinder 306. The base end of the bucket cylinder 306 is supported on the stick 302 and can move freely telescopically. The boom cylinder 304, stick cylinder 305, and bucket cylinder 306 are all hydraulic cylinders.

[0030] <1-3. Upper Rotating Body 400>

[0031] The upper rotating body 400 is located above the lower traveling body 200 and is configured to rotate relative to the lower traveling body 200 by means of a slewing bearing (not shown). The upper rotating body 400 includes an operating unit 401, a rotating frame 402, a rotating motor 403, and an internal combustion engine compartment 404. The rotating frame 402 is an example of the "base plate" of the present invention and is a plate extending perpendicularly in the vertical direction. The operating unit 401, the rotating motor 403, and various devices mounted in the internal combustion engine compartment 404 are mounted on the rotating frame 402. The upper rotating body 400 rotates by the drive of the rotating motor 403, which is a hydraulic motor, and by means of the slewing bearing.

[0032] A hydraulic pump 701 is installed on the upper rotating body 400 (see reference). Figure 2 Hydraulic pump 701 is powered by electric motor 621 (see reference). Figure 2The hydraulic pump 701 supplies working oil (pressurized oil) to the hydraulic motors (e.g., the left and right travel motors 202, the swing motor 403) and hydraulic cylinders (e.g., the boom cylinder 304, the stick cylinder 305, the bucket cylinder 306). The hydraulic motors and hydraulic cylinders driven by the working oil supplied from the hydraulic pump 701 are collectively referred to as hydraulic actuators 703 (see reference). Figure 2 ).

[0033] A driver's seat 4011 is provided in the control unit 401. Various levers 4012 are arranged around the driver's seat 4011. The operator sits in the driver's seat 4011 and operates the levers 4012 to drive the hydraulic actuator 703. As a result, the lower traveling body 200 can be moved, the excavation operation of the work machine 300 can be performed, and the upper rotating body 400 can be rotated.

[0034] Additionally, a battery unit 611 is provided on the upper rotating body 400. The battery unit 611 is, for example, composed of a lithium-ion battery cell, and stores electricity for driving the electric motor 621. The battery unit 611 can be configured to unitize multiple batteries, or it can be composed of a single battery cell.

[0035] Battery unit 611 is mounted on rotating frame 402 (see below). Figure 3 Furthermore, preferably, in this embodiment, the battery unit 611 is positioned further to the left than the electric motor 621 (i.e., the opposite side of the hydraulic pump 701). This allows the battery unit 611 to be freely arranged without interfering with the fan 31, electric motor 621, heat exchangers 32, 33, etc., described later. Furthermore, it allows for a further increase in the capacity (i.e., the energy storage capacity) of the battery unit 611.

[0036] A lead-acid battery 628 is also provided in the upper rotating body 400. The lead-acid battery 628 outputs a low-voltage (e.g., 12V) DC voltage. The output from the lead-acid battery 628 is used as a control voltage, for example, to the system controller 627 (see reference). Figure 2 Supply of components such as the drive unit for fan 31.

[0037] Additionally, a power supply port (not shown) is provided on the upper rotating body 400. This power supply port and a commercial power supply 500, which serves as an external power source, are connected via a power cable 501. Thus, the hydraulic excavator 100 can charge the battery unit 611 and the lead-acid battery 628.

[0038] The hydraulic excavator 100 can be structured to use both hydraulic equipment such as a hydraulic actuator 703 and an electrically driven actuator. Examples of electrically driven actuators include electric travel motors, electric cylinders, and electric swing motors.

[0039] <1-4. Structure of Electrical and Hydraulic Systems>

[0040] The hydraulic excavator 100 includes multiple electrical devices 600. These electrical devices 600 include: a refrigerant cooling device 610, which is cooled by heat exchange with a refrigerant; and an air-cooling device 620, which is cooled by airflow. In this embodiment, the refrigerant cooling device 610 includes, for example, a battery unit 611. Furthermore, the refrigerant in this embodiment is water for cooling, but it is not limited to this example; it can be a liquid other than water, or a cooling gas such as a CFC-free gas. Additionally, the air-cooling device 620 includes, for example, an electric motor 621, a charger 622, an inverter 623, a PDU 624, a junction box 625, a DC-DC converter 626, a system controller 627, and a lead-acid battery 628. The aforementioned electrical devices 600 are housed in an internal combustion engine compartment 404.

[0041] The electric motor 621 is composed of a permanent magnet motor or an induction motor and is driven by electricity supplied from the battery unit 611 via the junction box 625 and the inverter 623. The electric motor 621 is housed in the internal combustion engine compartment 404 and supported on the slewing frame 402 by means of anti-vibration support members 6211. That is, the hydraulic excavator 100 also includes anti-vibration support members 6211. The anti-vibration support members 6211 are disposed on both sides of the electric motor 621 in the front-rear direction on the slewing frame 402 to support the electric motor 621. Furthermore, the number of anti-vibration support members 6211 is three in this embodiment, but it is not limited to this example; there may be multiple members other than three, or even a single member.

[0042] Additionally, the hydraulic pump 701 is housed in the internal combustion engine compartment 404 and connected to the right side of the electric motor 621. 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 can be a variable capacity pump or a fixed capacity pump. Furthermore, in this embodiment, the hydraulic pump 701 is a single unit. However, it is not limited to this example, and there can be multiple hydraulic pumps 701.

[0043] Hydraulic pump 701 is connected to reservoir 705 via hydraulic hose 704. Reservoir 705 is a working oil tank that contains (stores) working oil. When hydraulic pump 701 is driven by electric motor 621, the working oil in reservoir 705 is supplied to hydraulic actuator 703 via control valve 702. This drives hydraulic actuator 703. Control valve 702 is a directional switching valve that controls the flow direction and flow rate of working oil supplied to hydraulic actuator 703. Thus, hydraulic excavator 100 has hydraulic pump 701 that is driven by any one of a plurality of electrical devices 600 (e.g., electric motor 621) to discharge working oil.

[0044] Charger 622, also known as a power supply, will draw power from a commercial power supply 500 (see reference). Figure 1 The AC voltage supplied via power cable 501 is converted into DC voltage. Inverter 623 converts the DC voltage supplied from battery unit 611 into AC voltage and supplies it to electric motor 621. This causes electric motor 621 to rotate. The supply of AC voltage (current) from inverter 623 to electric motor 621 is based on rotation commands output from system controller 627.

[0045] PDU624 is a battery control unit that controls the input and output of battery unit 611 to control the internal battery relay.

[0046] Junction box 625 is configured to include a charger relay, an inverter relay, a fuse, etc. The voltage output from the charger 622 is supplied to the battery unit 611 via junction box 625 and PDU 624. In addition, the voltage output from the battery unit 611 is supplied to the inverter 623 via PDU 624 and junction box 625.

[0047] The DC-DC converter 626 reduces 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). Similar to the output from the lead-acid battery 628, the voltage output from the DC-DC converter 626 is supplied to the system controller 627, the drive unit of the fan 31, and the like.

[0048] 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.

[0049] <1-5. Internal Structure of Internal Combustion Engine Compartment 404>

[0050] Figure 3 This is a cross-sectional view showing the internal structure of the internal combustion engine compartment 404 of the hydraulic excavator 100. Furthermore, Figure 3It shows that includes Figure 1 The cross-sectional structure of the internal combustion engine compartment 404 is virtually cut by a plane with double-dotted lines III-III and perpendicular to the vertical direction.

[0051] The hydraulic excavator 100 also includes an engine cover 1, a ventilation section 2, a fan 31, a radiator 32, an oil cooler 33, pipes 4, and a base 5. For example... Figure 3 As shown, the fan 31, radiator 32, oil cooler 33, pipe 4, and base 5 are housed in the internal combustion engine compartment 404.

[0052] The engine cover 1 is a housing that covers the internal combustion engine compartment 404, the pedals 4013 of the control unit 401, the side wall portions 4014 and 4015, the rotating frame 402, etc. In other words, the engine cover 1 is the outer wall of the internal combustion engine compartment 404. The engine cover 1 has an exhaust port 11. The exhaust port 11 is an opening formed at the front and on the right side of the engine cover 1, which connects the inside and outside of the internal combustion engine compartment 404. In this embodiment, a portion of the outside air drawn into the internal combustion engine compartment 404 from the ventilation section 2 through the pipe 4 is discharged to the outside through the exhaust port 11.

[0053] Vent 2 is disposed on the engine hood 1, connecting the inside and outside of the internal combustion engine compartment 404 to allow ventilation. External air is drawn into the internal combustion engine compartment 404 through the rotation of the fan 31. Furthermore, in this embodiment, vent 2 is disposed on the right side of the engine hood 1. However, this example does not exclude structures where vent 2 is disposed in a location other than the right side of the engine hood 1.

[0054] The fan 31 is positioned higher than the electric motor 621 and hydraulic pump 701 within the internal combustion engine compartment 404, and draws in outside air via the ventilation section 2. The fan 31 is supported inside the duct 4 and can rotate around a rotation axis CA extending in the left-right direction. The fan 31 in this embodiment has an intake-type structure. Therefore, when the fan 31 rotates, outside air passing through the ventilation section 2 is drawn into the duct 4 and flows inside the internal combustion engine compartment 404.

[0055] The radiator 32, an example of the "first heat exchanger" of the present invention, is disposed within the pipe 4 between the ventilation section 2 and the fan 31, and cools the refrigerant by exchanging heat with the outside air (air) drawn in through the ventilation section 2. The cooled refrigerant is used for electrical equipment 600 in the internal combustion engine compartment 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.

[0056] Oil cooler 33 is an example of the "second heat exchanger" of the present invention, and is equipped with hydraulic pump 701 and hydraulic actuator 703 (see reference). Figure 2 The oil circuit is connected to the hydraulic pump 701 to circulate the working oil. The oil cooler 33 cools the working oil circulating in the oil circuit by means of heat exchange with the outside air (air) taken in through the vent 2.

[0057] The duct 4 is a flow path for external air drawn in from the ventilation section 2. The duct 4 is a frame-shaped structure open at both ends in the left-right direction and extends in that direction. One end of the duct 4 is positioned upstream of the fan 31 and opens towards the ventilation section 2. One end of the duct 4 (end 411 of the first flow path 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 the duct 4 (e.g., the second opening 422 and the fourth opening 432 described later) opens into the internal combustion engine compartment 404. The fan 31, radiator 32, and oil cooler 33 are disposed within the duct 4. Specifically, these components are disposed midway through the flow path of external air within the duct 4. Additionally, the inverter 623 and the like are installed in the portion of the duct 4 further to the left (i.e., downstream of the external air) than the fan 31 (e.g., the second flow path 42 described later). A portion of the electric motor 621 and a hydraulic pump 701 are disposed below the duct 4. In addition, such as Figure 3 As shown, the charger 622 is located further back than the pipe 4 and the hydraulic pump 701.

[0058] The base portion 5 is housed within the internal combustion engine compartment 404, positioned across the hydraulic pump 701 on the slewing frame 402, and supports the fan 31. In the hydraulic excavator 100 according to this embodiment, the fan 31 is supported above the hydraulic pump 701 by the base portion 5, which is connected to the electric motor 621. Therefore, the fan 31 can be stably arranged vertically even when separated from the slewing frame 402 and the hydraulic pump 701. Thus, the effects of vibrations during the operation of the hydraulic excavator 100 can be suppressed or prevented from affecting the compactly arranged equipment (especially the fan 31) within the internal combustion engine compartment 404.

[0059] Furthermore, preferably, the base portion 5 also supports at least one of the heat exchangers, the radiator 32 and the oil cooler 33. In this embodiment, the base portion 5 supports both (see reference). Figure 3 and Figure 4 Accordingly, at least one of the heat exchangers, the radiator 32 and the oil cooler 33, can be supported by the base portion 5, on which the legs 52 (described later) are erected in the rotating frame 402. Therefore, the aforementioned at least one heat exchanger 32, 33 can be stably configured together with the fan 31. However, this example does not preclude a structure in which the base portion 5 does not support both the radiator 32 and the oil cooler 33. For example, the base portion 5 may only support the fan 31.

[0060] <1-5-1. Structural Example of Base Part 5>

[0061] Next, refer to Figure 4 and Figure 5 The structure of the base part 5 will be described. Figure 4 This is a perspective view showing an example of the configuration of the fan 31, base 5, electric motor 621, and hydraulic pump 701 relative to the rotating frame 402. Figure 5 This is a front view showing an example of the configuration of the legs 52 of the base 5 and the vibration damping support member 6211 of the electric motor 621, viewed from the right side.

[0062] like Figure 4 As shown, the base portion 5 has a retaining plate portion 51 and a plurality of legs 52.

[0063] The retaining plate portion 51 is a plate-shaped structure that extends in a direction intersecting (e.g., orthogonal) to the vertical direction, and it retains the fan 31. For example, the fan 31 is fixed to the retaining plate portion 51. Furthermore, in this embodiment, both the radiator 32 and the oil cooler 33 are further fixed to the retaining plate portion 51. However, this example does not exclude structures in which at least one of the radiator 32 and the oil cooler 33 is not fixed to the retaining plate portion 51.

[0064] Multiple legs 52 are erected on the rotating frame 402 and support the retaining plate portion 51. Furthermore, the number of legs 52 is three in this embodiment, but it is not limited to this example; there may be more than three. Moreover, this example does not exclude the possibility of a single leg 52.

[0065] Regarding the configuration of the multiple legs 52, the hydraulic pump 701 is preferably positioned in the front-rear direction between one group of legs 52 and another group of legs 52. Furthermore, none of the legs 52 are in contact with the hydraulic pump 701. For example, in Figure 4 Specifically, two legs 52 are positioned further forward than the hydraulic pump 701, and a single leg 52 is positioned further rearward than the hydraulic pump 701. Accordingly, the hydraulic pump 701 is positioned between one group of legs 52 and another group of legs 52 in the front-rear direction. This allows for efficient and flexible use of the space between the legs 52 arranged in the front-rear direction. Furthermore, by positioning the legs 52 close to the hydraulic pump 701, the front-rear dimension of the base portion 5 can be reduced. Therefore, the base portion 5 can be compactly constructed. However, this example does not preclude a structure where all legs 52 are positioned only on either side further forward or rearward than the hydraulic pump 701.

[0066] Furthermore, preferably, when viewed from above, each leg 52 is positioned outside the electric motor 621. For example, each leg 52 is neither in contact with nor erected from the electric motor 621. Accordingly, the legs 52 of the base portion 5 can be configured to be separated from the electric motor 621, thus making it difficult for vibrations from the hydraulic pump 701 of the electric motor 621, or vibrations of the electric motor 621 itself, to be transmitted to the base portion 5. Therefore, the hydraulic excavator 100 can suppress or prevent vibrations during operation from affecting the fan 31.

[0067] Additionally, preferably, such as Figure 4 As shown, in a top-down view, the multiple legs 52 are positioned further to the right than the electric motor 621. The multiple legs 52 can converge on the right side of the electric motor 621 and be arranged compactly.

[0068] Furthermore, preferably, the legs 52 are respectively disposed on both sides of the connection portion 6210 of the electric motor 621 and the hydraulic pump 701 in the longitudinal direction. In the connection portion 6210, the output shaft of the electric motor 621 is connected to the hydraulic pump 701. Therefore, the outer diameter (i.e., the longitudinal dimension) of the connection portion 6210 is smaller than the longitudinal dimensions of both the electric motor 621 and the hydraulic pump 701. Therefore, the legs 52 on both sides of the connection portion 6210 in the longitudinal direction can be arranged close together to reduce their spacing. Thus, multiple legs 52 can be compactly arranged. However, this example does not preclude a structure in which the legs 52 are disposed only on one side of the connection portion 6210 in the longitudinal direction.

[0069] Additionally, preferably, such as Figure 5 As shown, the front end of each leg 52 is positioned further forward than the rear end of the electric motor 621. Furthermore, the rear end of each leg 52 is positioned further rearward than the front end of the electric motor 621. That is, when viewed from the left-right direction, at least a portion of each leg 52 overlaps with the electric motor 621 in the left-right direction. Accordingly, the arrangement spacing of the legs 52 on both sides of the hydraulic pump 701 in the front-rear direction can be reduced. Thus, multiple legs 52 can be arranged compactly. However, this example does not exclude a structure where the front end of at least one leg 52 is positioned further rearward than the rear end of the electric motor 621, nor does it exclude a structure where the rear end of at least one leg 52 is positioned further forward than the front end of the electric motor 621.

[0070] Additionally, preferably, such as Figure 5As shown, the front end of each leg 52 is positioned further forward than the rear end of the anti-vibration support member 6211 located behind the electric motor 621. Furthermore, the rear end of each leg 52 is positioned further rearward than the front end of the anti-vibration support member 6211 located in front of the electric motor 621. That is, when viewed from the left-right direction, at least a portion of the leg 52 positioned in front of the hydraulic pump 701 only needs to overlap with or be positioned behind the anti-vibration support member 6211 positioned in front of the electric motor 621 in the left-right direction. Similarly, at least a portion of the leg 52 positioned behind the hydraulic pump 701 only needs to overlap with or be positioned in front of the anti-vibration support member 6211 positioned behind the electric motor 621 in the left-right direction. Accordingly, multiple legs 52 can be compactly arranged. However, this example does not exclude a structure in which the front end of at least one leg 52 is configured further rearward than the rear end of the vibration damping support member 6211 configured behind the electric motor 621, nor does it exclude a structure in which the rear end of at least one leg 52 is configured further forward than the front end of the vibration damping support member 6211 configured in front of the electric motor 621.

[0071] <1-5-2. Configuration of Radiator 32>

[0072] like Figure 3 As shown, the heat sink 32 is positioned on the right side (i.e., the ventilation section 2 side) relative to the fan 31. That is, the heat sink 32 is positioned upstream of the flow direction of the external air drawn in from the ventilation section 2 by the rotation of the fan 31, relative to the fan 31. Furthermore, when viewed from the left and right direction, the heat sink 32 covers one side (e.g., the rear part) of the fan 31.

[0073] For example, in this embodiment, the rear portion of the fan 31 is directly opposite the heat sink 32 in the left-right direction at a position upstream of the external air, closer to the fan 31. The front portion of the fan 31 is directly opposite the ventilation section 2 in the left-right direction. Furthermore, the "rear portion" of the fan 31 is an example of the "first portion" of the present invention. The "front portion" of the fan 31 is an example of the "second portion" of the present invention. In other words, the heat sink 32 is opposite the rear portion of the fan 31 in the left-right direction, but on the other hand, it is not opposite at least a portion of the front portion of the fan 31 in the left-right direction. According to the configuration of the heat sink 32 as described above, only a portion of the external air drawn in from the ventilation section 2 can be used for heat exchange of the heat sink 32.

[0074] <1-5-3. Configuration of Oil Cooler 33>

[0075] like Figure 3As shown, the oil cooler 33 is positioned on the left side (opposite to the ventilation section 2) relative to the fan 31. That is, the oil cooler 33 is positioned downstream of the flow direction of the external air drawn in from the ventilation section 2 relative to the fan 31. Furthermore, when viewed from the left and right direction, the oil cooler 33 is covered by the other side (e.g., the front part) of the fan 31.

[0076] The oil cooler 33 is disposed between the portion of the fan 31 directly opposite the vent 2 (front portion) and the inlet of the external air into the third flow path 43 of the duct 4 (described later). For example, in this embodiment, the front portion of the fan 31 is directly opposite the oil cooler 33 in the left-right direction at a position downstream of the fan 31 from the external air. The rear portion of the fan 31 is directly opposite the first opening 421 of the second flow path 42 (described later) in the left-right direction. In other words, the oil cooler 33 is opposite the front portion of the fan 31 in the left-right direction, but not at least a portion of the rear portion of the fan 31 in the left-right direction. According to the configuration of the oil cooler 33 as described above, another portion of the external air taken in from the vent 2 can be used for heat exchange in the oil cooler 33.

[0077] <1-5-4. Configuration of Fan 31, Radiator 32 and Oil Cooler 33>

[0078] Furthermore, based on the above configuration of the radiator 32 and oil cooler 33 relative to the fan 31, the hydraulic excavator 100 can divide the external air drawn into the internal combustion engine compartment 404 into two airflows by rotating one fan 31.

[0079] After contacting the radiator 32, an airflow flows through the rear portion of the fan 31 to the second flow path 42 of the duct 4 (described later). Therefore, the radiator 32 can cool the refrigerant supplied to the refrigerant cooling device 610 through heat exchange with the aforementioned airflow.

[0080] Another airflow comes into contact with the oil cooler 33 via the portion in front of the fan 31, and then flows into the third flow path 43 of the duct 4 (described later). Therefore, the oil cooler 33 can cool the oil via the hydraulic pump 701 and hydraulic actuator 703 (see reference 701) through heat exchange with the aforementioned other airflow. Figure 2 The working oil circulating in the oil circuit is used for cooling.

[0081] Thus, in this embodiment, the external air drawn in through the vent 2 can cool the radiator 32 and the oil cooler 33 separately, and can flow through different flow paths (i.e., the second flow path 42 and the third flow path 43). This suppresses or prevents the aforementioned airflow from the external air drawn in through the vent 2, which passes through the radiator 32, from contacting the oil cooler 33. Therefore, it suppresses or prevents the airflow whose temperature rises due to heat exchange in the radiator 32 from contacting the oil cooler 33. Furthermore, the aforementioned other airflow does not contact the oil cooler 33 without passing through the radiator 32. Therefore, an airflow with the same temperature as the external air can contact the oil cooler 33. Thus, the oil cooler 33 can cool the working oil more efficiently; that is, the temperature of the working oil can be lowered through heat exchange with the aforementioned airflow. In addition, compared with the structure in which cooling fans are respectively configured for radiator 32 and oil cooler 33, the cooling structure of radiator 32 and oil cooler 33 can be realized in a more compact layout suitable for small hydraulic excavators 100.

[0082] <1-6. Pipe 4>

[0083] Next, the structural example of pipe 4 will be explained. For example... Figure 3 As shown, the pipe 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.

[0084] External air drawn in from the ventilation section 2 and directed toward the fan 31 flows through the first flow path section 41. One end 411 of the first flow path section 41 is connected to the ventilation section 2 and communicates with the outside of the hydraulic excavator 100 (particularly the internal combustion engine compartment 404). The fan 31 is located at the other end of the first flow path section 41.

[0085] In addition, in this embodiment, the pipe 4 also has a cover 412. The cover 412 covers the upper surface of the retaining plate portion 51 of the base portion 5 and together with the retaining plate portion 51 forms the first flow path portion 41. That is, the retaining plate portion 51 is part (bottom) of the first flow path portion 41. However, it is not limited to this example, and the retaining plate portion 51 may not be part of the first flow path portion 41. For example, at least the first flow path portion 41 in which the fan 31 is disposed may be supported by the base portion 5.

[0086] Furthermore, the flow path section in duct 4, located further to the left than fan 31 (opposite to vent 2), is divided by partition plate 44. Thus, the two flow paths are arranged in a front-to-back direction. The second flow path section 42 is the rearmost of the two flow paths, allowing airflow through the portion behind fan 31. The third flow path section 43 is the frontmost of the two flow paths, allowing airflow through the portion in front of fan 31.

[0087] The second flow path 42 guides cooler external air (airflow) that has undergone heat exchange with the radiator 32 to the air-cooled device 620, such as the electric motor 621. The second flow path 42 has a first opening 421 and a second opening 422. The first opening 421 is the upstream end of the second flow path 42 for the external air and opens to the right. The first opening 421 communicates with the other end of the first flow path 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 second flow path 42 for the external air. The second opening 422 is an example of the "downstream opening" of the present invention, configured to open further downstream of the fan 31 and facing the upper part of the electric motor 621. For example, in this embodiment, the upper surface of the second flow path 42 slopes downwards towards the left. Therefore, the left portion of the second flow path 42 bends downwards. As a result, the second opening 422 opens downwards and is positioned opposite the electric motor 621 in the vertical direction. This allows for cooling of the electric motor 621 in a compact layout. However, the shape of the second flow path 42 is not limited to the shape described above.

[0088] For example, a portion of the outside air drawn in from the vent 2 comes into contact with the radiator 32, which cools refrigerant such as water. This outside air becomes a cooler airflow due to heat exchange with the radiator 32, and flows through the rear portion of the fan 31 into the first opening 421 of the second flow path 42. That is, the outside air deviates from the oil cooler 33 (i.e., passes outside the oil cooler 33) and flows into the interior of the second flow path 42.

[0089] In this embodiment, the front portion of the inverter 623 is disposed on the side behind the second flow path 42. Therefore, the inverter 623 can be efficiently air-cooled using the cool airflow flowing inside the second flow path 42.

[0090] Furthermore, in this embodiment, the second opening 422 is positioned vertically opposite the electric motor 621. Therefore, the cooler airflow flowing inside the second flow path 42 is delivered from the second opening 422 toward the electric motor 621 and directly contacts the electric motor 621. This improves the cooling efficiency of the electric motor 621.

[0091] Furthermore, in this embodiment, some air-cooled devices 620, such as the charger 622, are arranged around the second flow path section 42. Additionally, the second opening 422 faces the space where the power supply device 600 is located, i.e., it communicates with that space. Therefore, the cool airflow exiting from the second opening 422 can air-cool not only the electric motor 621, but also other air-cooled devices 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 devices 610 such as the battery unit 611. Therefore, the cooling efficiency of the power equipment 600 is further improved.

[0092] Furthermore, in this embodiment, the refrigerant cooling device 610 (particularly the battery unit 611) is positioned near the second flow path portion 42 (particularly the second opening portion 422). Thus, the hydraulic excavator 100 can cool the refrigerant cooling device 610 and the multiple air-cooling devices 620 in a compact configuration. Therefore, the hydraulic excavator 100 can effectively and flexibly utilize the limited space within the internal combustion engine compartment 404 and efficiently cool the electrical equipment 600.

[0093] The third flow path 43 is an example of the "flow path" of the present invention, which guides the hotter external air (airflow) that has undergone heat exchange with the oil cooler 33 to the exhaust port 11 disposed on the engine cover 1. The third flow path 43 has a third opening 431 and a fourth opening 432. The third opening 431 is the upstream end of the external air in the third flow path 43, and is arranged in the front-rear direction with the first opening 421 of the second flow path 42 through the partition plate 44 and opens to the right. The third opening 431 communicates with the other end of the first flow path 41 and is opposite to the front part of the fan 31 in the left-right direction. The fourth opening 432 is the downstream end of the external air in the third flow path 43. In addition, the rear side of the third flow path 43 (i.e., the partition plate 44) is inclined forward as it tends to the left. Therefore, the left side of the third flow path 43 bends forward. As a result, the fourth opening 432 opens forward. However, the shape of the third flow path 43 is not limited to the above shape.

[0094] Additionally, the oil cooler 33 is disposed in the third flow path section 43. Furthermore, in this embodiment, as... Figure 3 As shown, at least a portion of the oil cooler 33 is disposed within the third opening 431 (i.e., the upstream end of the third flow path 43) and covers the third opening 431.

[0095] Accordingly, a portion of the intake outside air deviates from the radiator 32 (i.e. passes outside the radiator 32), passes in front of the fan 31, and comes into contact with the oil cooler 33, which cools the working oil. This outside air becomes a higher temperature airflow through heat exchange in the oil cooler 33, flows inside the third flow path 43, and is discharged forward from the fourth opening 432.

[0096] Furthermore, the airflow discharged forward from the fourth opening 432 does not circulate within the internal combustion engine compartment 404, but is instead discharged to the outside from the exhaust port 11 located in front of the engine cover 1. This suppresses the rise in internal temperature of the internal combustion engine compartment 404 and prevents or inhibits contact between the hot airflow and the electrical equipment 600.

[0097] However, not limited to the above example, the oil cooler 33 may also be disposed inside the third flow path 43 at the portion exiting from the third opening 431. Alternatively, the oil cooler 33 may cover either the third opening 431 or the fourth opening 432 outside the third flow path 43, or it may be disposed outside the third flow path 43 near either the third opening 431 or the fourth opening 432.

[0098] <2. Remarks>

[0099] The embodiments of the present invention have been described above. Furthermore, the above embodiments are examples, and various modifications can be made to the combinations of each structural element and each process; those skilled in the art will understand that such modifications are also within the scope of the present invention.

[0100] For example, in the above embodiments, a hydraulic excavator 100, as a construction machine, was described as an example of the "operating machinery" of the present invention. However, this example does not exclude the application of the present invention to operating machinery structures other than the hydraulic excavator 100. For example, the "operating machinery" of the present invention may be other construction machinery such as wheel loaders, or agricultural machinery such as combine harvesters and tractors.

[0101] <3. Summary>

[0102] The following is a summary description of the implementation methods described above.

[0103] For example, the operating machine 100 disclosed in this specification is formed with the following structure (first structure), and includes:

[0104] The substrate 402 extends perpendicularly to the vertical direction;

[0105] An electric motor 621 is supported on the substrate 402;

[0106] A hydraulic pump 701 is connected to one side (e.g., the right side) of the electric motor 621 in a first direction perpendicular to the vertical direction.

[0107] Fan 31, which is configured to be positioned higher than the hydraulic pump 701; and

[0108] The base portion 5 is disposed on the base plate 402, spanning the hydraulic pump 701, and supports the fan 31.

[0109] The operating machinery 100 of the first structure described above can also be configured as the following structure (second structure).

[0110] The base portion 5 has:

[0111] The retaining plate 51 holds the fan 31; and

[0112] Multiple legs 52 are erected on the base plate 402 and support the retaining plate portion 51.

[0113] The hydraulic pump 701 is disposed between one portion of the leg 52 and another portion of the leg 52 in a second direction (e.g., the front-back direction) perpendicular to the vertical direction and the first direction.

[0114] The operating machinery 100 of the second structure described above can also be configured as the following structure (third structure).

[0115] When viewed from above, each of the legs 52 is positioned outside the electric motor 621.

[0116] Alternatively, the work machinery 100 with the second or third structure described above can also be configured as the following structure (fourth structure).

[0117] When viewed from above, the plurality of legs 52 are configured to be positioned further to one side (e.g., the right side) than the electric motor 621 in the first direction.

[0118] Alternatively, the working machine 100 of any of the second to fourth structures described above can also be configured as the following structure (fifth structure).

[0119] The legs 52 are respectively disposed on both sides of the connection portion 6210 of the electric motor 621 and the hydraulic pump 701 in the second direction (e.g., the front-to-back direction).

[0120] Alternatively, the working machine 100 of any of the second to fifth structures mentioned above can also be configured as the following structure (sixth structure).

[0121] The end portion (e.g., the front end portion) of each leg 52 in the second direction is configured to be further to one side (e.g., the front end portion) than the end portion (e.g., the rear end portion) of the electric motor 621 in the second direction.

[0122] The end of each leg 52 on the other side (e.g., rear) in the second direction is configured to be further to the other side (e.g., rear) than the end of the electric motor 621 on one side (e.g., front) in the second direction.

[0123] Alternatively, the working machine 100 of any of the second to sixth structures described above can also be configured as the following structure (seventh structure).

[0124] It also includes a vibration damping support member 6211, which is disposed on both sides of the electric motor 621 on the base plate 402 in the second direction (e.g., the front-to-back direction) and supports the electric motor 621.

[0125] The plurality of legs 52 are configured to be further to the other side (e.g., the left side) than the vibration damping support member 6211 on one side (e.g., the right side) of the second direction, and further to one side (e.g., the right side) than the vibration damping support member 6211 on the other side (e.g., the left side) of the second direction.

[0126] Alternatively, the working machine 100 of any of the first to seventh structures mentioned above can also be configured as the following structure (eighth structure).

[0127] It also includes a battery unit 611, which is configured on the substrate 402 on the opposite side (e.g., the left side) of the first direction than the electric motor 621.

[0128] Alternatively, the working machine 100 of any of the first to eighth structures mentioned above can also be configured as the following structure (ninth structure).

[0129] It also has:

[0130] The engine cover 1, together with the base plate 402, encloses the internal combustion engine compartment 404 that houses the electric motor 621, the hydraulic pump 701, the base portion 5 and the fan 31.

[0131] Ventilation section 2, disposed on the engine cover 1, and capable of allowing ventilation between the inside and outside of the internal combustion engine compartment 404; and

[0132] The duct 4, which houses the fan 31, allows external air drawn in from the ventilation section 2 to circulate.

[0133] The pipe 4 has:

[0134] An upstream opening 411 is configured to be located upstream of the external air, beyond the fan 31, and opens towards the vent 2; and

[0135] The downstream opening 422 is configured to be located further downstream of the external air than the fan 31 and opens towards the upper part of the electric motor 621.

[0136] Alternatively, the work machine 100 of the ninth structure mentioned above can also be configured as the following structure (tenth structure).

[0137] It also includes a first heat exchanger 32, which is disposed within the pipe 4 between the ventilation section 2 and the fan 31, and uses the outside air to cool the refrigerant used in the electrical equipment 600 in the internal combustion engine compartment 404.

[0138] The first part of the fan 31 is directly opposite the first heat exchanger 32.

[0139] The second part of the fan 31 is directly opposite the ventilation section 2.

[0140] Alternatively, the work machine 100 of the aforementioned ninth or tenth structure can also be configured as the following structure (eleventh structure).

[0141] It also has:

[0142] The second heat exchanger 33 is configured downstream of the external air than the fan 31, and uses the external air to cool the working oil circulating in the oil circuit by means of the hydraulic pump 701; and

[0143] The flow path 43 guides the external air, which has undergone heat exchange in the second heat exchanger 33, to the exhaust port 11 disposed on the engine cover 1.

[0144] The second heat exchanger 33 is disposed between the portion of the fan 31 that is directly opposite the ventilation section 2 and the external air inlet 431 of the flow path section 43.

[0145] In addition, the working machine 100 of any of the above-mentioned ninth to eleventh structures can also be formed as the following structure (twelfth structure).

[0146] It also has:

[0147] A first heat exchanger 32, disposed within the pipe 4, utilizes a portion of the external air to cool the refrigerant used in the electrical equipment 600 within the internal combustion engine compartment 404; and

[0148] The second heat exchanger 33 is disposed within the pipe 4 and uses external air to cool the working oil circulating in the oil circuit by means of the hydraulic pump 701.

[0149] The base portion 5 also supports at least one of the first heat exchanger 32 and the second heat exchanger 33.

[0150] [Potential for Industrial Applications]

[0151] This invention can be used, for example, in construction machinery, agricultural machinery, and other operating machinery.

Claims

1. A work machine, wherein the work machine is provided with: a base plate extending in a direction perpendicular to a vertical direction; 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 disposed above the hydraulic pump; and a pedestal portion disposed on the base plate across the hydraulic pump and supporting the fan.

2. The work machine according to claim 1, wherein the pedestal portion has: a holding plate portion holding the fan; and a plurality of leg portions erected on the base plate and supporting the holding plate portion, the hydraulic pump is disposed between a part of the leg portions and another part of the leg portions in a second direction perpendicular to the vertical direction and the first direction.

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

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

5. The work machine according to claim 2, wherein the leg portions are respectively disposed on both sides of the electric motor and the connection portion of the hydraulic pump in the second direction.

6. The work machine according to claim 2, wherein an end portion on one side of the second direction of each of the leg portions is disposed on one side more than an end portion on the other side of the second direction of the electric motor, an end portion on the other side of the second direction of each of the leg portions is disposed on the other side more than an end portion on one side of the second direction of the electric motor.

7. The work machine according to claim 2, wherein the work machine is further provided with vibration isolation supporting members disposed on both sides of the electric motor in the second direction on the base plate and supporting the electric motor, a plurality of the leg portions are disposed on the other side more than the vibration isolation supporting member on one side of the second direction and on one side more than the vibration isolation supporting member on the other side of the second direction.

8. The work machine according to claim 1, wherein the work machine is further provided with a battery unit disposed on the base plate on the other side of the first direction more than the electric motor.

9. The work machine according to any one of claims 1 to 8, wherein the work machine is further provided with: an engine cover enclosing an internal combustion engine room in which the electric motor, the hydraulic pump, the pedestal portion, and the fan are accommodated together with the base plate; an air passage portion disposed on the engine cover and allowing air in and out of the internal combustion engine room; and a duct internally provided with the fan and through which external air taken in from the air passage portion flows, the duct has: an upstream opening portion disposed on an upstream side of the external air more than the fan and opened to face the air passage portion; and an ​ A downstream opening portion is disposed on a downstream side of the fan with respect to the outside air and opens toward an upper portion of the electric motor.

10. The work machine according to claim 9, wherein The work machine is further provided with a first heat exchanger that is disposed in the duct between the ventilation portion and the fan and cools refrigerant for electric power equipment in the internal combustion engine room using the outside air, The first portion of the fan directly opposes the first heat exchanger, The second portion of the fan directly opposes the ventilation portion.

11. The work machine according to claim 9, wherein The work machine is further provided with: a second heat exchanger that is disposed on a downstream side of the fan with respect to the outside air and cools working oil that is circulated in an oil passage by the hydraulic pump using the outside air; and a flow path portion that guides the outside air that has been heat-exchanged in the second heat exchanger toward an exhaust port that is disposed in the engine hood, The second heat exchanger is disposed between a portion of the fan that directly opposes the ventilation portion and an inlet of the outside air of the flow path portion.

12. The work machine according to claim 9, wherein The work machine is further provided with: a first heat exchanger that is disposed in the duct and cools refrigerant for electric power equipment in the internal combustion engine room using a portion of the outside air; and a second heat exchanger that is disposed in the duct and cools working oil that is circulated in an oil passage by the hydraulic pump using the outside air, The base portion also supports at least either one of the first heat exchanger and the second heat exchanger. ​ ​

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