Work machine

Abstract

To provide a work machine capable of appropriately and efficiently adjusting a temperature in an upper turning body.SOLUTION: A shovel 100 serving as a work machine comprises: a body (lower traveling body 1, upper turning body 3); an operation part A operably provided in the body; and a power output part DD that is provided in the upper turning body 3 and that operates the operation port A. The body includes a power storage device 19, a heat exchange part 60 that circulates a refrigerant through the power storage device 19 and exchanges heat with air to cool the refrigerant; and a fan 63 that distributes the air to the heat exchange part 60. The body includes a switching part 90 capable of switching between a state where the air passed through the heat exchange part 60 can be distributed to the power output part DD and a state where the air passed through the heat exchange part 60 cannot be distributed to the power output part DD.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a working machine.

Background Art

[0002] Patent Document 1 discloses a working machine (excavator) including a lower traveling body, an upper revolving body, a hydraulic actuator, an engine, a main pump, a pump motor, a power storage device, etc. Further, when the hydraulic actuator operates, the excavator cools the radiator that cools the power storage device and cools the engine by blowing air by rotating a fan installed at a position facing the engine.

[0003] This type of excavator forms an air flow path that passes through the radiator from one side surface of the upper revolving body to the other side surface. Further, in the upper revolving body of the excavator, hydraulic equipment, electric equipment, a power storage device, etc. are installed on the downstream side of the radiator in the air flow path.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, some excavators are configured as electric types that apply an electric motor instead of an engine. An electric excavator is provided with a large power storage device inside the upper revolving body, and in order to adjust the temperature of the power storage device, it is necessary to install a heat exchange part such as a radiator as in the case of an engine.

[0006] In this case, inside the upper swing body 3, the air heated in the radiator flows toward the power storage device side, and the ambient temperature around the power storage device is likely to rise. When the air heated in this way flows toward the power storage device side, it becomes difficult for the excavator to adjust the temperature even if it tries to adjust the temperature of the power storage device to the target temperature.

[0007] In addition, when the temperature of the surrounding environment is low or the like, the excavator needs to warm up the hydraulic drive system of the upper swing body, and improvement in the efficiency of this warm-up operation is required.

[0008] The present disclosure provides a working machine capable of appropriately and efficiently adjusting the temperature inside the upper swing body.

Means for Solving the Problems

[0009] According to one aspect of the present disclosure, there is provided a working machine including a main body portion, an operating portion operably provided on the main body portion, and a power portion provided inside the main body portion for operating the operating portion, wherein the main body portion includes a power storage device, a heat exchange portion that circulates a refrigerant with respect to the power storage device and cools the refrigerant by heat exchange with air, a fan that circulates the air through the heat exchange portion, and a switching portion that can switch between a state in which the air that has passed through the heat exchange portion can flow to the power portion and a state in which the air that has passed through the heat exchange portion cannot flow to the power portion.

Advantages of the Invention

[0010] According to one aspect, the working machine can appropriately and efficiently adjust the temperature inside the upper swing body.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the drawings. In each drawing, the same reference numerals are given to the same components, and redundant descriptions may be omitted.

[0013] [Overview of Excavator] First, referring to FIG. 1, an overview of the excavator 100 according to the embodiment will be described. FIG. 1 is a side view showing the excavator 100 according to the embodiment.

[0014] The excavator 100 according to the embodiment includes a lower traveling body 1 constituting the main body, an upper revolving body 3, an attachment AT installed on the main body, and a cabin 10 on which an operator rides.

[0015] The lower traveling body 1 includes, for example, a pair of left and right crawlers 1C, and each crawler 1C is hydraulically driven by traveling hydraulic motors 1A and 1B (see FIG. 2) to make the excavator 100 travel.

[0016] The upper revolving body 3 is mounted on the lower traveling body 1 so as to be rotatable via a slewing mechanism 2, and is driven by a slewing hydraulic motor 2A (see FIG. 2) of the slewing mechanism 2 to rotate relative to the lower traveling body 1. Note that the drive source of the slewing mechanism 2 is not limited to a hydraulic actuator, and an electric motor or the like may be applied.

[0017] The attachment AT of the excavator 100 includes a boom 4, an arm 5, and a bucket 6. The boom 4 is pivotally connected to the center of the front part of the upper swing body 3. The arm 5 is rotatably connected to the tip of the boom 4. The bucket 6 is rotatably connected to the tip of the arm 5. The boom 4 is hydraulically driven by a boom cylinder 7 which is a hydraulic actuator. The arm 5 is hydraulically driven by an arm cylinder 8 which is a hydraulic actuator. The bucket 6, which is an end attachment, is hydraulically driven by a bucket cylinder 9 which is a hydraulic actuator.

[0018] Note that, depending on the work content and the like, other end attachments may be attached to the tip of the arm 5 instead of the bucket 6. The other end attachments may be buckets such as a slope bucket, a dredging bucket, etc. Further, the other end attachments may be different types of end attachments from buckets such as a breaker, a stirrer, a grappler, etc. Also, auxiliary attachments such as a quick coupling or a tilt rotator may be provided at the connection part between the end attachment including the bucket 6 and the arm 5.

[0019] The above excavator 100 has a lower traveling body 1 (left and right crawlers 1C), an upper swing body 3, a boom 4, an arm 5, and a bucket 6 as an operating part A that operates based on the operation of the operator and the like. The excavator 100 according to the embodiment hydraulically drives all the operating parts A with hydraulic oil supplied from a main pump 14 having an electric motor 12 for a pump as a power source. That is, the excavator 100 according to the embodiment is an electric type excavator in which an engine mounted on a well-known excavator is replaced with an electric motor 12 for a pump. Note that the excavator 100 may be configured to electrically drive some or all of the operating parts A by electric actuators. For example, the slewing mechanism 2 can slew the upper swing body 3 relative to the lower traveling body 1 by electric drive by replacing the slewing hydraulic motor 2A with an electric motor.

[0020] The cab 10 is the driver's cab in which the operator (user) rides and is mounted on the front left side of the upper swing body 3 (see also FIG. 3). The excavator 100 operates the operating parts A such as the lower traveling body 1 (left and right crawlers 1C), the upper swing body 3, the boom 4, the arm 5, and the bucket 6 according to the operation of the operator. Note that the excavator 100 may be configured to operate by remote control or automatic operation, and in this case, the cab 10 may not be provided.

[0021] The remote control includes, for example, a mode in which the excavator 100 is operated by an operation input related to an actuator of the excavator 100 performed by a predetermined external device. The external device includes a remote control room provided outside the excavator 100, a management device that manages the excavator 100, a terminal device used by the user of the excavator 100, and the like. The excavator 100 is equipped with a communication device capable of communicating with the external device, and may transmit, for example, imaging information obtained by imaging the periphery of the excavator 100 to the external device. The external device displays the imaging information of the excavator 100 on a display device for remote control. Further, the excavator 100 causes various information displayed on the output device 50 in the cab 10 to be displayed on the remote control display device of the external device. Thereby, the operator of the external device can remotely control the excavator 100 while checking the periphery and information of the excavator 100 displayed on the remote control display device. The excavator 100 can drive the operating parts A such as the lower traveling body 1, the upper swing body 3, the boom 4, the arm 5, and the bucket 6 in response to a remote control signal received from the external device by the communication device.

[0022] Automated operation includes a mode in which the actuators of the excavator 100 are automatically operated without relying on the operation of the operator. In other words, the excavator 100 may have a function (so-called "MC (Machine Control) function") of automatically operating a part or all of the operating parts A such as the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, and the bucket 6. In this case, the automated operation may include a function (so-called "semi-automated operation function") of automatically operating an operating part A different from the operating part A to be operated in response to the operation (or remote operation) of the operator in the cab 10. Alternatively, the automated operation may include a function (so-called "fully automated operation function") of automatically operating at least a part of the operating part A without relying on the operation of the operator.

[0023] [Configuration of Excavator] Next, the specific configuration of the excavator 100 will be described with reference to FIG. 2. FIG. 2 is a block diagram schematically showing the configuration of the excavator 100 according to the embodiment. In FIG. 2, the mechanical power transmission system is indicated by a double line, the hydraulic oil line of the hydraulic drive system is indicated by a thick solid line, the hydraulic oil line of the operation system is indicated by a broken line, and the power and electrical signal transmission systems are indicated by thin solid lines, respectively.

[0024] The excavator 100 includes respective components such as a hydraulic drive system, an electric drive system, a power supply system, an operation system, a temperature control system, a user interface system, and a control system.

[0025] [Hydraulic Drive System] The hydraulic drive system of the excavator 100 is a group of components related to the hydraulic drive of the operating part A. The hydraulic drive system includes hydraulic actuators such as traveling hydraulic motors 1A and 1B that hydraulically drive the lower traveling body 1, the boom 4, the arm 5, the bucket 6, etc., a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9. Further, the hydraulic drive system of the excavator 100 has a hydraulic power unit for supplying and discharging hydraulic oil to the hydraulic drive system inside the upper slewing body 3, such as a pump motor 12, a main pump 14, a control valve 17, and a hydraulic oil tank T.

[0026] The motor 12 for the pump is the power source of the power unit for hydraulic pressure. For the motor 12 for the pump, for example, an IPM (Interior Permanent Magnet) motor can be applied. The motor 12 for the pump is connected to the power storage device 19 via the inverter 18. The motor 12 for the pump operates in power running by converting the electric power supplied from the power storage device 19 into three-phase AC power by the inverter 18, and drives the main pump 14 and the pilot pump 15. The motor 12 for the pump is drive-controlled based on the control of the inverter 18 by the controller 30.

[0027] The main pump 14 (an example of a hydraulic pump) sucks hydraulic oil from the hydraulic oil tank T, discharges the hydraulic oil to the high-pressure hydraulic line 16, and supplies the hydraulic oil to the control valve 17 through the high-pressure hydraulic line 16. The operation of the main pump 14 is controlled by the motor 12 for the pump. The main pump 14 is, for example, a variable displacement hydraulic pump, and the angle (tilt angle) of a swash plate of a regulator (not shown) is adjusted under the control of the controller 30. Thereby, the main pump 14 can adjust the stroke length of the piston and match the discharge flow rate of the hydraulic oil to the target flow rate.

[0028] The control valve 17 is an example of a hydraulic control device that controls the hydraulic power unit according to an operation command of an operator or an operation command of an automatic operation. The control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16, and selectively supplies the hydraulic oil supplied from the main pump 14 to a plurality of hydraulic actuators. For example, the control valve 17 is configured as a valve unit having a plurality of control valves (direction switching valves) that control the flow rate and the flow direction of the hydraulic oil supplied from the main pump 14 to each of the hydraulic actuators. The hydraulic oil supplied from the main pump 14 and flowing through the control valve 17 and the hydraulic actuator is returned from the control valve 17 to the hydraulic oil tank T.

[0029] <Electric drive system> The electric drive system of the excavator 100 is a group of components related to the power source of the electric excavator 100 and the electric drive of the operating part A. The electric drive system has, for example, an electric power unit such as a pump motor 12, a sensor 12s, and an inverter 18 in order to circulate the hydraulic oil of the hydraulic power unit. Further, the electric power unit includes various electric components (converters, capacitors, circuit boards, etc.) installed for the electric drive of the excavator 100. When a part or all of the operating part A is electrically driven as described above, the electric power unit of the excavator 100 may include an electric actuator, an inverter, etc. for driving each component of the operating part A respectively. In other words, the excavator 100 has, as a power unit DD for operating the operating part A, a hydraulic power unit of the hydraulic drive system and an electric power unit of the electric drive system inside the upper swing body 3.

[0030] The sensor 12s includes a current sensor 12s1, a voltage sensor 12s2, and a rotation state sensor 12s3. The current sensor 12s1 and the voltage sensor 12s2 are provided in the power path between the pump motor 12 and the inverter 18. The current sensor 12s1 detects the currents of the three phases (U phase, V phase, and W phase) of the pump motor 12 respectively. The detection signal of the current sensor 12s1 is transmitted to the inverter 18 (or the controller 30) through a communication line and used for the control of the inverter 18. The voltage sensor 12s2 detects the applied voltages of the three phases of the pump motor 12 respectively. The detection signal of the voltage sensor 12s2 is transmitted to the inverter 18 (or the controller 30) through a communication line and used for the control of the inverter 18. The rotation state sensor 12s3 detects the rotation state of the rotation shaft of the pump motor 12 by applying, for example, a rotary encoder or a resolver. The rotation state of the pump motor 12 includes a rotation position (rotation angle), a rotation speed, etc. The detection signal of the rotation state sensor 12s3 is transmitted to the inverter 18 (or the controller 30) through a communication line and used for the control of the inverter 18.

[0031] The inverter 18 drives and controls the pump motor 12 based on the commands of the controller 30. The inverter 18 includes, for example, a conversion circuit that converts DC power into three-phase AC power, a drive circuit that drives the conversion circuit by switching, and a control circuit that outputs a control signal that defines the operation of the drive circuit. The control signal is, for example, a PWM (Pulse Width Modulation) signal. The control circuit of the inverter 18 performs drive control of the pump motor 12 while grasping the operating state of the pump motor 12. For example, the control circuit of the inverter 18 matches the rotational speed of the pump motor 12 so that the rotational speed of the detection signal of the rotational state sensor 12s3 matches the commanded target rotational speed. Further, the control circuit of the inverter 18 may estimate the rotational angle of the rotating shaft of the pump motor 12 based on the detection signal of the current sensor 12s1, the detection signal of the voltage sensor 12s2, etc., and grasp the operating state of the pump motor 12.

[0032] <Power supply system> The power supply system of the excavator 100 is a group of components for supplying power to each electrical device of the electric power unit. The power supply system of the excavator 100 includes, for example, a power storage device 19, a DC-DC converter 44, a battery 46, an in-vehicle charger 70, and a charging port 72.

[0033] The power storage device 19 is an energy source for driving the actuators of the excavator 100. The power storage device 19 is charged by being connected to an external commercial power supply via the charging port 72 with a charging cable, and supplies the charged power to the inverter 18, the DC-DC converter 44, etc. The power storage device 19 is, for example, a lithium-ion battery and has a high output voltage (for example, several hundred volts). Note that a power conversion device for boosting the output voltage of the power storage device 19 and applying it to the pump motor 12 may be provided between the power storage device 19 and the pump motor 12. Further, when a part or all of the operating unit A is electrically driven, the power of the power storage device 19 is supplied to the electric actuator that electrically drives the operating unit A.

[0034] The DC-DC converter 44 is provided, for example, in the cabin 10 (see also FIG. 3), and steps down the DC voltage output from the power storage device 19 to a predetermined voltage (for example, about 24 volts) and outputs it. The output power of the DC-DC converter 44 is supplied to the battery 46 or other electrical equipment. Examples of other electrical equipment include the controller 30, the refrigerant pump 62, the fan 63, the switching unit 90, and the like. Note that the DC-DC converter 44 is not limited to being provided singly as shown in FIG. 2, and a plurality of them may be provided. Further, the DC-DC converter 44 may be replaced with an alternator that generates electricity using the power of the pump motor 12.

[0035] The battery 46 is, for example, a lead-acid battery, a lithium-ion battery, or the like, and is provided in the upper revolving body 3. The battery 46 has a low output voltage (for example, 24 volts), charges the power from the DC-DC converter 44, and supplies power to the other electrical equipment described above.

[0036] The in-vehicle charger 70 converts, for example, single-phase AC power of 100 volts, 200 volts, or 400 volts supplied from an external commercial power source through the charging port 72 into DC power and charges the power storage device 19.

[0037] The charging port 72 is provided on the side surface of the cabin 10 or the like, and the plug of a charging cable extending from an external commercial power source is inserted therein. The charging port 72 includes two charging ports 72A and 72B. The charging port 72A is connected to a commercial power source capable of supplying single-phase AC power of, for example, 100 volts or 200 volts, and enables normal charging in which the power of this commercial power source is supplied to the power storage device 19 through the in-vehicle charger 70. The charging port 72B is connected to a commercial power source capable of supplying DC power at a higher voltage (for example, 400 volts) than the charging port 72A, and enables rapid charging in which the power of this commercial power source is directly supplied to the power storage device 19.

[0038] <Operating system> The operating system of the excavator 100 is a group of components related to the operation of the operating unit A. The operating system of the excavator 100 includes a pilot pump 15, an operating device 26, and a hydraulic control valve 31.

[0039] The pilot pump 15 supplies pilot pressure to various hydraulic devices (such as the hydraulic control valve 31) mounted on the excavator 100 via the pilot line 25. The pilot pump 15 is, for example, a fixed displacement hydraulic pump and is driven by the pump motor 12. Thereby, the hydraulic control valve 31 supplies a pilot pressure corresponding to the operation content (such as the operation amount and operation direction) of the operator's operation device 26 to the control valve 17 under the control of the controller 30. Further, the hydraulic control valve 31 may supply a pilot pressure corresponding to the content of the remote operation designated by the remote operation signal and a pilot pressure corresponding to the operation command corresponding to the automatic operation to the control valve 17. Note that the pilot pump 15 may be omitted. In this case, the hydraulic oil discharged from the main pump 14 and reduced to a predetermined pilot pressure via a pressure reducing valve (not shown) may be supplied to various hydraulic devices such as the hydraulic control valve 31.

[0040] The operation device 26 is provided within the reach of the operator at the operator's seat in the cab 10 and is used for the operator to manually operate the working part A (the left and right crawlers 1C of the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, the bucket 6, etc.). For example, the operation device 26 is electric and outputs an electric signal corresponding to the operation content of the operator to the controller 30. Thereby, the controller 30 can control the hydraulic control valve 31 etc. and control the operation of the working part A of the excavator 100 according to the operation content of the operator and the operation command corresponding to the automatic operation. Note that when the control valve 17 is composed of an electromagnetic pilot type hydraulic control valve, the operation signal of the electric operation device 26 may be directly input to the control valve 17 and each hydraulic control valve may perform an operation corresponding to the operation content of the operation device 26. Further, the operation device 26 may be a hydraulic pilot type that outputs a pilot pressure corresponding to the operation content. In this case, the pilot pressure corresponding to the operation content is supplied to the control valve 17.

[0041] The hydraulic control valve 31 outputs a pilot pressure based on the control of the controller 30 using the hydraulic oil supplied from the pilot pump 15 through the pilot line 25. Thereby, the hydraulic control valve 31 supplies the pilot pressure to the control valve 17 connected to the pilot line on the secondary side.

[0042] <Temperature control system> The temperature control system of the excavator 100 is a component group for cooling components that generate heat during the operation of the excavator 100, charging of the power storage device 19, etc., and for warming up when the temperature of the power unit DD (hydraulic power unit including hydraulic oil, electric power unit, etc.) is low. For example, the temperature control system of the excavator 100 includes a heat exchange unit 60 including a radiator 61, a refrigerant pump 62, and a refrigerant circuit (not shown). Further, the temperature control system of the excavator 100 includes a fan 63 and a switching unit 90.

[0043] The radiator 61 is installed in a part of the refrigerant circuit, allows the refrigerant (for example, cooling water) circulating in the refrigerant circuit to flow through the internal flow path, and cools the refrigerant by exchanging heat with the air around the internal flow path. The refrigerant pump 62 operates with the power supplied from the DC-DC converter 44 or the battery 46 to circulate the refrigerant in the refrigerant circuit.

[0044] The refrigerant circuit connects, for example, between the radiator 61 and the power storage device 19, allows the refrigerant to flow inside or outside the power storage device 19 to cool the power storage device 19. Also, the refrigerant circuit allows the refrigerant heated by the power storage device 19 to flow to the radiator 61, and cools the refrigerant at the radiator 61 as described above. Note that the refrigerant circuit may connect to the power unit DD (hydraulic power unit, electric power unit) and the power supply system other than the power storage device 19 and circulate the refrigerant to cool each component. Examples of components other than the power storage device 19 include the pump motor 12, the inverter 18, the DC-DC converter 44, the in-vehicle charger 70, etc. The refrigerant circuit may connect in series or in parallel some or all of the plurality of cooling targets as long as the conditions regarding the required cooling performance for each of the plurality of cooling targets are satisfied. In this case, the arrangement order of the plurality of cooling targets may be arbitrarily designed.

[0045] The fan 63 rotates based on the control of the controller 30 to circulate air to the radiator 61. The fan 63 operates, for example, with electric power supplied from the DC-DC converter 44 or the battery 46. In the embodiment, a total of four fans 63 are installed, two in the longitudinal direction (front-rear direction) of the radiator 61 and two in the height direction (up-down direction). However, the number of fans 63 is of course not particularly limited.

[0046] Further, the fan 63 is installed at an adjacent position to the radiator 61 and on the downstream side of the radiator 61 in the air flow path (see also FIG. 3). Thereby, a large amount of air can be circulated to the radiator 61, and the radiator 61 can efficiently cool the refrigerant. Furthermore, the fan 63 is installed between the radiator 61 (the main part of the heat exchange unit 60) and the power supply system including the power unit DD (hydraulic power unit, electric power unit) and the power storage device 19, and circulates air toward an appropriate configuration of the power unit DD.

[0047] Note that the temperature control system of the excavator 100 may include an oil cooler that cools the hydraulic oil used in the hydraulic drive system (high-pressure hydraulic line) and the operation system (pilot line). The oil cooler is provided, for example, in the return oil path between the control valve 17 and the hydraulic oil tank T, and performs heat exchange between the ambient air and the hydraulic oil flowing through the inside to cool the hydraulic oil. In this case, the fan 63 may blow air toward the oil cooler to cool the oil cooler. The fan 63 that blows air to the radiator 61 and the fan that blows air to the oil cooler may be the same or different.

[0048] The switching unit 90 is a functional unit that switches the air flow state when the fan 63 circulates air inside the upper swing body 3. The configuration of this switching unit 90 will be described in detail later.

[0049] <User interface system> The user interface system of the excavator 100 is a group of components that exchanges information with the operator. The user interface system includes, for example, an output device 50 and an input device 52.

[0050] Under the control of the controller 30, the output device 50 outputs various types of information to the operator. The output device 50 includes a display device, a lighting device, etc. that output (notify) information to the operator in a visual manner. Further, the output device 50 may include a sound output device such as a buzzer or a speaker that outputs information to the operator in an auditory manner.

[0051] The input device 52 includes, for example, an operation input device such as a button, a toggle, a lever, a touch panel, a touch pad, etc. that receives the operator's operation input. Further, the input device 52 may include, for example, a voice input device that receives the operator's voice input or a gesture input device that receives the operator's gesture input. A signal corresponding to the input from the operator received by the input device 52 is taken into the controller 30.

[0052] <Control system> The control system of the excavator 100 is a group of components related to various controls of the excavator 100. The control system of the excavator 100 includes a controller 30, a peripheral information acquisition device 40, a power sensor 48, a temperature sensor 54 for the power storage device, a temperature sensor 56 for the hydraulic oil, and a charge state monitoring sensor 58.

[0053] The controller 30 may have each function realized by any hardware, or any combination of hardware and software. For example, the controller 30 is mainly configured around a computer including a CPU (Central Processing Unit), a memory device such as a RAM (Random Access Memory), an auxiliary storage device such as a ROM (Read Only Memory), and an interface device to the outside. The controller 30 realizes various functions by, for example, loading a program installed in the auxiliary storage device into the memory device and executing it on the CPU. Note that the functions of the controller 30 may be realized in a distributed manner by a plurality of control units (control circuits).

[0054] The peripheral information acquisition device 40 detects the situation around the excavator 100 and outputs the detected information to the controller 30. The peripheral information acquisition device 40 is composed of one or a combination of ultrasonic sensors, millimeter-wave radars, monocular cameras, stereo cameras, depth cameras, LIDAR (Light Detection and Ranging), distance image sensors, infrared sensors, etc.

[0055] The power sensor 48 measures the state of the power supplied from the DC-DC converter 44 and the battery 46. For example, the power sensor 48 may include a current sensor that measures the current supplied from the DC-DC converter 44 and the battery 46, and a voltage sensor that measures the voltage.

[0056] The temperature sensor 54 for the power storage device is provided inside or on the outer surface of the power storage device 19, detects the temperature of the power storage device 19, and transmits the detected information to the controller 30. Thereby, the controller 30 can monitor the temperature of the power storage device 19. The temperature sensor 56 for the hydraulic oil is provided at an appropriate position in the supply line of the hydraulic oil, detects the temperature of the hydraulic oil flowing through the supply line, and transmits the detected information to the controller 30. Thereby, the controller 30 can monitor the temperature of the hydraulic oil. Note that the temperature sensor 56 for the hydraulic oil may be provided in the hydraulic oil tank T or the like.

[0057] The charge state monitoring sensor 58 detects information related to the charge state of the power storage device 19 (so-called battery SOC: State Of Charge), and transmits the detected information to the controller 30. For monitoring the charge state of the power storage device 19, a well-known method can be selected, and the charge state monitoring sensor 58 may also be a sensor corresponding to the selected method (for example, an ammeter, a voltmeter, etc.).

[0058] [Arrangement structure of various devices in the upper slewing body 3] Next, the arrangement structure of various devices in the upper slewing body 3 will be described with reference to FIG. 3. FIG. 3 is a partial plan sectional view showing an example of the arrangement structure of various devices in the upper slewing body 3.

[0059] The upper slewing body 3 includes a floor wall 3F that faces the lower traveling body 1 and fixes various components. The upper slewing body 3 also has a left side wall 3L that is continuous with the left side of the floor wall 3F and extends in the vertical direction, a right side wall 3R that is continuous with the right side of the floor wall 3F and extends in the vertical direction, and a rear side wall 3B that is continuous with the rear side of the floor wall 3F and extends in the vertical direction.

[0060] With respect to this upper slewing body 3, the power storage device 19 is installed from the front part on the right side wall 3R side to the central part in the front-rear direction. The cabin 10 is installed from the front part on the left side wall 3L side of the upper slewing body 3 to the central part in the front-rear direction. In FIG. 3, the frame 10F that supports the cabin 10 is shown by a solid line, and the cabin 10 is shown by a two-dot chain line. Further, charging ports 72 (charging ports 72A, 72B) are provided on the side surface of the cabin 10 of the upper slewing body 3. Inside the cabin 10, a DC-DC converter 44, an in-vehicle charger 70, etc. are arranged.

[0061] And the upper slewing body 3 arranges a pump motor 12, a main pump 14, a pilot pump 15, a control valve 17, an inverter 18, a battery 46, a refrigerant pump 62, a radiator 61, a fan 63, etc. closer to the rear side wall 3B side.

[0062] The motor 12 for the pump and the inverter 18 are integrally installed at approximately the center in the left - right direction of the upper swing body 3. The rotating shaft of the motor 12 for the pump projects along the left - right direction and in the right direction. For example, the motor 12 for the pump is arranged at a position close to the floor wall 3F so that the positions of the main pump 14 and the pilot pump 15 that are mechanically drivably connected are as low as possible (see also FIG. 4). Thereby, the position of the main pump 14 can be made lower than the liquid level inside the hydraulic oil tank T, and the generation of air entrainment in the main pump 14 can be suppressed. The main pump 14 and the pilot pump 15 are installed adjacent to the right side of the motor 12 for the pump by being connected to the rotating shaft of the motor 12 for the pump. A transmission mechanism such as a speed reducer may be installed between the motor 12 for the pump and the main pump 14 and the pilot pump 15.

[0063] The control valve 17 is arranged above the motor 12 for the pump in the vertical direction. Specifically, the motor 12 for the pump and the main pump 14 are arranged on the floor - wall 3F side of the upper swing body 3, and the control valve 17 is arranged on the upper - wall 3U side of the upper swing body 3 (see also FIG. 4). For example, the upper swing body 3 includes a pedestal 17MT that straddles the motor 12 for the pump in the front - rear direction, and the control valve 17 is installed on this pedestal 17MT. Note that the control valve 17 may be arranged on the side of the main pump 14 or the pilot pump 15.

[0064] The upper swing body 3 mounts the swing hydraulic motor 2A of the swing mechanism 2 at approximately the center in the front - rear direction and the left - right direction. Also, the upper swing body 3 installs a hydraulic oil tank T between the swing hydraulic motor 2A and the motor 12 for the pump. The hydraulic oil tank T is fixed to the floor wall 3F directly or via a bracket or the like.

[0065] Furthermore, the upper swing body 3 installs a radiator 61, which is a main component of the heat exchange unit 60, and a refrigerant pump 62 near the left - side wall 3L and the rear - side wall 3B (the rear side of the cabin 10). In addition, a battery 46, a fan 63, etc. are installed.

[0066] The radiator 61 is arranged in a state of standing substantially perpendicular to the floor wall 3F. Thereby, the radiator 61 can perform heat exchange with the refrigerant flowing through the inside of the radiator 61 by passing air in the left - right direction of the upper swivel body 3.

[0067] The fan 63 is arranged adjacent to the right side of the radiator 61. The fan 63 is attached to the radiator 61, for example, via a resin - made fan shroud (not shown), and thus is fixed via the radiator 61. The fan 63 blows air to each component of the upper swivel body 3 by allowing air to flow from the radiator 61 side (left side) to the power unit DD side (right side).

[0068] Also, the upper swivel body 3 includes a partition wall 3W that partitions the inside of the upper swivel body 3 at a substantially central portion in the left - right direction on the rear side of the cabin 10 (between the fan 63 and the pump motor 12). The partition wall 3W is connected to the rear wall 3B and the frame 10F and extends in the front - rear direction. Thereby, the partition wall 3W separates the left space 80L where the main components of the heat exchange unit 60 are arranged from the right space 80R where the hydraulic power unit such as the pump motor 12 and the hydraulic oil tank T, the electric power unit, the power storage device 19, etc. are arranged. The left space 80L is an example of the first space inside the upper swivel body 3, and the right space 80R is an example of the second space inside the upper swivel body 3.

[0069] The excavator 100 has a part of the switching unit 90 installed on this partition wall 3W. Specifically, the switching unit 90 includes a first shutter 90A installed on the partition wall 3W, and the first shutter 90A switches the communication and blockage between the left space 80L and the right space 80R. The first shutter 90A is installed on the front side and the upper side of the partition wall 3W (see also FIG. 4) and switches the communication state between the upper sides of the left space 80L and the right space 80R.

[0070] The first shutter 90A has a plurality of rotatable movable vanes 91 arranged vertically, and has a drive motor (not shown), a transmission mechanism, etc. for rotating each movable vane 91. The drive motor is connected to the controller 30 via a driver, and rotates each movable vane 91 under the command of the controller 30.

[0071] The first shutter 90A is in an open state by rotating each movable vane 91 horizontally to separate them from each other, and is in a closed state by rotating each movable vane 91 vertically to overlap them with each other (see also FIGS. 4 and 5). Thereby, the first shutter 90A allows the air to flow by communicating the left space 80L and the right space 80R in the open state, and blocks the air flow between the left space 80L and the right space 80R in the closed state.

[0072] Also, the switching unit 90 includes a second shutter 90B installed on the right side wall 3R surrounding the right space 80R. For example, the second shutter 90B is provided on the rear side of the right side wall 3R. The second shutter 90B also has a plurality of rotatable movable vanes 91 arranged vertically, and has a drive motor (not shown), a transmission mechanism, etc. for rotating each movable vane 91. The drive motor is connected to the controller 30 via a driver, and rotates each movable vane 91 under the command of the controller 30.

[0073] The second shutter 90B is in an open state by rotating each movable vane 91 horizontally to separate them from each other, and is in a closed state by rotating each movable vane 91 vertically to overlap them with each other. Thereby, the second shutter 90B allows the air to flow by communicating the right space 80R and the outside of the upper rotating body 3 in the open state, and blocks the air flow between the right space 80R and the outside of the upper rotating body 3 in the closed state (see also FIGS. 4 and 5).

[0074] FIG. 4 is a longitudinal sectional view schematically showing various components installed in the upper swing body 3 and the open state of the switching unit 90. FIG. 5 is a longitudinal sectional view schematically showing various components installed in the upper swing body 3 and the closed state of the switching unit 90. As shown in FIGS. 3 to 5, the excavator 100 includes a plurality of side communication ports 92 on the left side wall 3L surrounding the left space 80L, which communicate between the left space 80L and the outside of the upper swing body 3. Each side communication port 92 enables air outside the upper swing body 3 to be introduced into the left space 80L based on the rotation of the fan 63.

[0075] Furthermore, the excavator 100 includes a plurality of lower communication ports 93 in the floor wall 3F at a position adjacent to the partition wall 3W on the left space 80L side, and a plurality of upper communication ports 94 in the upper wall 3U at a position adjacent to the partition wall 3W of the left space 80L. Each lower communication port 93 and each upper communication port 94 enable the air in the left space 80L to be discharged to the outside (downward or upward), respectively.

[0076] [Switching of the air flow state in the upper swing body 3] Next, the operation of the switching unit 90 installed in the upper swing body 3 will be described with reference to FIGS. 4 and 5.

[0077] As shown in FIG. 4, the excavator 100 can open the first shutter 90A and the second shutter 90B in an open state under the control of the controller 30. When the first shutter 90A is opened, the left space 80L and the right space 80R communicate with each other. Therefore, when the fan 63 is rotating, the open first shutter 90A can allow air to flow from the left space 80L to the right space 80R. Also, when the second shutter 90B is opened, the right space 80R and the outside communicate with each other. As a result, the switching unit 90 can smoothly discharge the air flowing into the right space 80R to the outside.

[0078] The excavator 100 rotates the fan 63 to allow air to flow from each side communication port 92 into the left space 80L and pass through the radiator 61. As a result, the radiator 61 of the heat exchange section 60 performs heat exchange between the passing air and the refrigerant. The air heated by passing through the radiator 61 passes through the open first shutter 90A and moves from the left space 80L to the right space 80R. The air heated in the right space 80R hits the control valve 17 and the hydraulic oil tank T, making it possible to promote the heating of the hydraulic oil.

[0079] Here, the excavator 100 may be used even when the temperature of the surrounding environment is low (for example, 0° or below). In this case, since the temperature of the hydraulic oil is low at the start of operation of the excavator 100, adverse effects such as a slow flow of the hydraulic oil occur, so normal operation is performed after the warm-up operation of the power unit DD including the hydraulic oil. In the warm-up operation of the excavator 100, as described above, if the air heated by the radiator 61 via the first shutter 90A is supplied to the control valve 17 and the hydraulic oil tank T, it becomes possible to more efficiently heat the components of the power unit DD including the hydraulic oil. That is, the excavator 100 can shorten the warm-up operation time by communicating the left space 80L and the right space 80R with the switching unit 90.

[0080] On the other hand, in normal operation where the working part A is operated after the warm-up operation, the hydraulic oil is in a state where it can flow smoothly. The excavator 100 rotates the pump motor 12 by power supply from the power storage device 19 in normal operation to operate the main pump 14 and the pilot pump 15, and supplies the hydraulic oil to the control valve 17. As a result, the excavator 100 can drive an appropriate hydraulic actuator in the power unit DD to operate the working part A.

[0081] In this normal operation, if the air heated by the radiator 61 is circulated to the right space 80R, although the refrigerant in the heat exchange unit 60 is circulated to the power storage device 19 to adjust the temperature of the power storage device 19, the heated air will increase the ambient temperature of the power storage device 19. Therefore, the excavator 100 according to the embodiment performs control to keep the first shutter 90A in a closed state during normal operation.

[0082] As shown in FIG. 5, in the closed state of the first shutter 90A, the left space 80L and the right space 80R are blocked. The air heated by passing through the radiator 61 due to the rotation of the fan 63 is exhausted to the outside through the lower communication port 93 and the upper communication port 94 of the upper swing body 3. On the other hand, the heated air does not flow into the right space 80R. The temperature rise of the power storage device 19 is suppressed by the refrigerant circulating through the refrigerant circuit of the heat exchange unit 60. As a result, the excavator 100 can operate the operating part A while properly adjusting the temperature of the power storage device 19 to the target temperature during normal operation.

[0083] Also, during normal operation, the switching part 90 closes the second shutter 90B under the control of the controller 30. Thereby, the excavator 100 can suppress the operating noise of each component (for example, the pump motor 12) in the right space 80R from leaking to the outside as noise.

[0084] In order to automatically execute the operation of the switching part 90 described above, it is preferable that the controller 30 switches the open state and the closed state of the first shutter 90A and the second shutter 90B based on the temperature of the hydraulic oil and / or the temperature of the power storage device 19. For example, the controller 30 compares the temperature of the power storage device 19 detected by the temperature sensor 54 for the power storage device with a temperature threshold value for the power storage device held in advance. The temperature threshold value for the power storage device is a threshold value that distinguishes between the case where the air passing through the radiator 61 does not heat up because the temperature of the power storage device 19 itself is low and the case where the air passing through the radiator 61 heats up because the temperature of the power storage device 19 is high, and is set in advance through experiments or the like.

[0085] That is, when the temperature of the power storage device 19 is equal to or higher than the temperature threshold for the power storage device, the air is heated by the radiator 61 according to the temperature of the power storage device 19. Conversely, when the temperature of the power storage device 19 is lower than the temperature threshold for the power storage device, the air is not heated by the radiator 61 according to the temperature of the power storage device 19. When performing a warm-up operation, since the temperature of the power storage device 19 is equal to or higher than the temperature threshold for the power storage device, the heated air can be supplied to the power unit DD.

[0086] Also, for example, the controller 30 compares the temperature of the hydraulic oil detected by the hydraulic oil temperature sensor 56 with a pre-held temperature threshold for the hydraulic oil. The temperature threshold for the hydraulic oil is a threshold that distinguishes between the case where a warm-up operation is required because the temperature of the hydraulic oil is low and the case where a warm-up operation is not required because the temperature of the hydraulic oil is high, and is set in advance by experiments or the like. That is, when the temperature of the hydraulic oil is lower than the temperature threshold for the hydraulic oil, a warm-up operation is required. Conversely, when the temperature of the hydraulic oil is equal to or higher than the temperature threshold for the hydraulic oil, a warm-up operation is not required.

[0087] From the above, when the temperature of the power storage device 19 is equal to or higher than the temperature threshold for the power storage device and the temperature of the hydraulic oil is lower than the temperature threshold for the hydraulic oil, the controller 30 may perform control to keep the first shutter 90A and the second shutter 90B open. Thereby, the excavator 100 can stably perform a warm-up operation to raise the temperature of the power unit DD.

[0088] Conversely, when the temperature of the power storage device 19 is lower than the temperature threshold for the power storage device or the temperature of the hydraulic oil is equal to or higher than the temperature threshold for the hydraulic oil, the controller 30 may perform control to keep the first shutter 90A and the second shutter 90B closed. Thereby, the excavator 100 can prevent the air heated (heat exchanged) as the power storage device 19 is cooled from flowing to the power unit DD side.

[0089] [Operation during charging] In addition, when charging the power storage device 19, the excavator 100 can also advance the start time of the normal operation of the excavator 100 by appropriately controlling the switching unit 90. Hereinafter, an example of the processing flow from charging the power storage device 19 to starting the normal operation of the excavator 100 will be described with reference to FIG. 6. FIG. 6 is a flowchart showing the processing flow of the operation method of the excavator 100. The controller 30 of the excavator 100 controls steps S101 to S108 in FIG. 6 in the operation method. Note that the "charging" of the power storage device 19 is a concept including both normal charging for storing power via the charging port 72A and rapid charging for storing more power than normal charging via the charging port 72B. Hereinafter, the case of performing rapid charging on the power storage device 19 will be described.

[0090] First, when the controller 30 recognizes the connection of the charging cable to the charging port 72B, it starts charging the power storage device 19 (step S101). By this charging, the power storage device 19 stores power and its temperature rises.

[0091] Therefore, the controller 30 closes the left space 80L and the right space 80R by the switching unit 90 and operates the temperature control system to cool the power storage device 19 (step S102). At this time, the controller 30 monitors the temperature of the power storage device 19 by the temperature sensor 54 for the power storage device and controls the rotation of the fan 63, etc., to adjust the degree of cooling of the refrigerant in the radiator 61 and suppress the temperature rise of the power storage device 19.

[0092] Also, while the power storage device 19 is being charged, the controller 30 monitors the temperature of the hydraulic oil based on the detection information of the hydraulic oil temperature sensor 56, and determines whether warm-up operation is necessary (step S103). When the power storage device 19 is being rapidly charged, it is assumed that the excavator 100 will start operating immediately after charging. Therefore, the excavator 100 can lead to a rapid start of operation by determining in advance whether warm-up operation is necessary based on the temperature of the hydraulic oil. If the controller 30 determines that warm-up operation is necessary because the temperature of the hydraulic oil is lower than the pre-held hydraulic oil temperature threshold (step S103: YES), it proceeds to step S104. On the other hand, if the controller 30 determines that warm-up operation is unnecessary because the temperature of the hydraulic oil is equal to or higher than the hydraulic oil temperature threshold (step S103: NO), it proceeds to step S108. At this time, the controller 30 may also make a determination not to start warm-up operation when comparing the temperature of the power storage device 19 with the power storage device temperature threshold as described above and the temperature of the power storage device 19 is lower than the power storage device temperature threshold.

[0093] In step S104, the controller 30 monitors the charging state of the power storage device 19 based on the detection information of the charge state monitoring sensor 58, and determines whether the charging is nearing completion. For example, the controller 30 holds a charge state threshold corresponding to the charging state, and determines that the charging is nearing completion by recognizing that the charging state has reached or exceeded the charge state threshold. The charge state threshold is not particularly limited, and for example, an appropriate value within the range of 80% to 99% may be set. If the controller 30 determines that the charging is not nearing completion (step S104: NO), it continues to monitor the charging state. Then, when the controller 30 determines that the charging is nearing completion (step S104: YES), it proceeds to step S105.

[0094] In step S105, the controller 30 opens the first shutter 90A of the switching unit 90 and also opens the second shutter 90B. As a result, the air from the fan 63 that has been rotating for cooling the power storage device 19 flows from the left space 80L into the right space 80R. The air heated by the radiator 61 hits the control valve 17 and the hydraulic oil tank T, and the temperature of these hydraulic oils can be increased. In other words, the excavator 100 starts a warm-up operation during (at the end of) the charging of the power storage device 19, and by warming the hydraulic oil with the heated air, the efficiency of the warm-up operation can be promoted. Also at this time, although air also goes towards the power storage device 19, since the charging of the power storage device 19 is almost finished, the influence on the power storage device 19 can be suppressed.

[0095] Then, the controller 30 monitors the temperature of the hydraulic oil based on the detection information of the hydraulic oil temperature sensor 56 during the warm-up operation, and determines whether to end the warm-up operation (step S106). When the controller 30 continues the warm-up operation (step S106: NO), it repeats this process, while when the controller 30 ends the warm-up operation (step S106: YES), it proceeds to step S107. Note that the charging of the power storage device 19 may be completed during the warm-up operation in which air is introduced into the right space 80R, or may be completed after the warm-up operation is ended.

[0096] In step S107, the controller 30 closes the first shutter 90A of the switching unit 90 and also closes the second shutter 90B. As a result, the air due to the rotation of the fan 63 is discharged from the left space 80L to the outside through the lower communication port 93 and the upper communication port 94.

[0097] Then, the controller 30 shifts to the normal operation of the excavator 100 after the completion of the charging of the power storage device 19 and with the first shutter 90A and the second shutter 90B in the closed state (step S108). At this time, the temperature of the hydraulic oil of the excavator 100 has risen with respect to the outside air temperature, the time of the warm-up operation can be reduced, and it becomes possible to start the normal operation smoothly.

[0098] As described above, even during charging of the power storage device 19, the excavator 100 can start the warm-up operation at an early stage by keeping the switching unit 90 in the open state, and can smoothly start the normal operation after the warm-up operation after charging. In normal operation, the heated air does not flow into the periphery of the power storage device 19. Therefore, the excavator 100 can suppress the temperature rise of the power storage device 19 and operate the operating part A.

[0099] In this embodiment, the excavator 100 is described as an example of the work machine. However, the work machine is not limited to an excavator, and may be, for example, a crane, an asphalt finisher, a forklift, a wheel loader, or the like.

[0100] Note that the work machine according to the present disclosure is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the switching unit 90 is configured to be automatically operated under the control of the controller 30, but the work machine may switch the switching unit 90 by an operator operating an input device 52 such as a switch. Further, when starting charging, a target time for completion of charging may be input based on the work schedule. Thereby, since charging can be completed immediately before the start of work, in addition to promoting the warm-up operation, the time for maintaining the warm-up state can be shortened.

[0101] Also, the air flow path through which the fan 63 circulates air is not limited to the above-described embodiment. For example, in the plan view of FIG. 3, air is circulated generally from the left side to the right side at the rear side of the upper swing body 3, but air may be circulated obliquely from the rear side of the upper swing body 3 to the right front side. Alternatively, the excavator 100 may include a duct that circulates air from the fan 63 to the control valve 17 or the hydraulic oil tank T, and the switching unit 90 may be configured to switch between air flowability and non-flowability in the duct. Further, although the power unit DD and the power storage device 19 are installed in the same right space 80R in the excavator 100, the power unit DD and the power storage device 19 may be installed in separate partitioned spaces.

[0102] The technical idea and effects of the present disclosure described in the above embodiments will be described below.

[0103] One aspect of the present disclosure is a work machine (excavator 100) including a main body part (lower traveling body 1, upper slewing body 3), an operating part A operably provided on the main body part, and a power part DD provided inside the main body part for operating the operating part A. The main body part includes a power storage device 19, a heat exchange part 60 that circulates a refrigerant with respect to the power storage device 19 and cools the refrigerant by heat exchange with air, and a fan 63 that circulates air through the heat exchange part 60. The main body part also includes a switching part 90 that can switch between a state in which the air that has passed through the heat exchange part 60 can flow to the power part DD and a state in which the air that has passed through the heat exchange part 60 cannot flow to the power part DD.

[0104] According to the above, the work machine (excavator 100) is provided with the switching part 90 that can make the air that has passed through the heat exchange part 60 flowable and non-flowable to the power part DD, so that the air heated by the heat exchange part 60 can be appropriately utilized or exhausted. Therefore, the excavator 100 can appropriately and efficiently adjust the temperature inside the upper slewing body 3. For example, when the warm-up operation of the power part DD is required, the excavator 100 can efficiently perform the warm-up operation by making the heated air flow to the power part DD. Also, for example, during normal operation, by exhausting the heated air, unnecessary heating of the power part DD can be suppressed, and the excavator 100 can operate stably.

[0105] Further, the main body part (upper slewing body 3) includes a partition wall 3W that partitions a first space (left space 80L) where the heat exchange part 60 and the fan 63 are installed and a second space (right space 80R) where the power part DD is installed. The switching part 90 includes a shutter (first shutter 90A) provided on the partition wall 3W. The shutter can switch between an open state that allows air to flow between the first space and the second space and a closed state that blocks air flow between the first space and the second space. Thereby, the work machine (excavator 100) can easily switch between the state where air can flow and the state where air cannot flow between the first space and the second space by opening and closing the shutter of the partition wall 3W.

[0106] Further, the power unit DD includes an operating oil tank T for storing the operating oil and a control valve 17 for switching the flow of the operating oil, and is provided with a controller 30 that controls the switching between the open state and the closed state of the shutter (first shutter 90A) based on the temperature of the operating oil and / or the temperature of the power storage device 19. Thereby, the working machine (excavator 100) can appropriately switch between the state where air can flow and the state where air cannot flow according to the temperature of the operating oil and / or the temperature of the power storage device 19.

[0107] Also, when the temperature of the power storage device 19 is equal to or higher than the temperature threshold for the power storage device and the temperature of the operating oil is lower than the threshold for the operating oil, the controller 30 sets the shutter (first shutter 90A) to the open state. When either the temperature of the power storage device 19 is lower than the temperature threshold for the power storage device or the temperature of the operating oil is equal to or higher than the threshold for the operating oil, the controller 30 sets the shutter to the closed state. Thereby, when the temperature of the operating oil is low, the working machine (excavator 100) can perform a warm-up operation of the power unit DD by utilizing the heat when the temperature of the power storage device 19 rises. Conversely, the excavator 100 can suppress the temperature drop of the power unit DD by not allowing air to flow through the power unit DD when the temperature of the power storage device 19 has not risen. Furthermore, when the temperature of the operating oil is high, the temperature rise of the power unit DD can be suppressed by not allowing air to flow through the power unit DD.

[0108] Also, in a warm-up operation for raising the temperature of the power unit DD, the controller 30 sets the shutter (first shutter 90A) to the open state, and in a normal operation for operating the working part A after the warm-up operation, the controller 30 sets the shutter to the closed state. Thereby, the working machine (excavator 100) can efficiently switch from the warm-up operation to the normal operation under the control of the controller 30.

[0109] Further, the controller 30 starts charging the power storage device 19 with the shutter (first shutter 90A) in the closed state, and monitors the charging state of the power storage device 19 during charging to open the shutter before the charging of the power storage device 19 is completed. As a result, the working machine (excavator 100) can warm up the power unit DD even during charging of the power storage device 19, and can operate efficiently after charging the power storage device 19.

[0110] Further, when the main body (upper swing body 3) shuts off the air flow between the first space (left space 80L) and the second space (right space 80R) by the shutter (first shutter 90A), it has communication ports (lower communication port 93, upper communication port 94) for discharging air above and / or below the first space. As a result, the working machine (excavator 100) can exhaust the air in the first space well in the closed state of the shutter, and can avoid disturbing the heat exchange between the air and the refrigerant in the heat exchange unit 60.

[0111] Further, the switching unit 90 is installed on the side wall surrounding the second space (right space 80R) of the upper swing body 3, and includes a side shutter (second shutter 90B) that opens and closes between the second space and the outside. The side shutter is opened as the shutter (first shutter 90A) is opened, and is closed as the shutter is closed. As a result, the working machine (excavator 100) can smoothly exhaust the air that has flowed into the second space to the outside, and can reduce the noise of the power unit DD by closing the second space when air does not flow into the second space.

[0112] Further, the main body (upper swing body 3) arranges the power unit DD and the power storage device 19 in the same space. As a result, the working machine (excavator 100) can increase the degree of freedom in the layout of each component of the power unit DD. Moreover, the excavator 100 can appropriately and efficiently adjust the temperature inside the upper swing body 3 by switching the switching unit 90.

[0113] Further, the main body portion has a lower traveling body 1 and an upper swing body 3 rotatably provided on the lower traveling body 1, and the operating portion includes a boom 4, an arm 5, and a bucket 6 which are attachments provided on the upper swing body 3. Thereby, the excavator 100 which is a working machine can stably perform cooling of the power storage device 19 and the like during the operation of the attachment.

[0114] The excavator 100 according to the embodiment disclosed this time is illustrative in all respects and not restrictive. The embodiment can be modified and improved in various forms without departing from the scope of the appended claims and its gist. Matters described in the above plurality of embodiments can adopt other configurations within a non - contradictory range, and can also be combined within a non - contradictory range.

Explanation of Reference Numerals

[0115] 1 Lower traveling body 3 Upper swing body 3W Partition wall 19 Power storage device 60 Heat exchange portion 63 Fan 80L Left space 80R Right space 90 Switching portion 90A First shutter 90B Second shutter 93 Lower communication port 94 Upper communication port 100 Excavator A Operating portion

Claims

1. A main body part, An operating part operably provided on the main body part, A working machine including a power part provided inside the main body part for operating the operating part, wherein the main body part has a power storage device, a heat exchange part for circulating a refrigerant with respect to the power storage device and cooling the refrigerant by heat exchange with air, and a fan for allowing the air to flow through the heat exchange part, and is provided with a switching part capable of switching between a state in which the air that has passed through the heat exchange part can flow to the power part and a state in which the air that has passed through the heat exchange part cannot flow to the power part. Working machine.

2. The main body part includes a partition wall for partitioning a first space where the heat exchange part and the fan are installed and a second space where the power part is installed, the switching part includes a shutter provided on the partition wall, and the shutter can be switched between an open state allowing the air to flow between the first space and the second space and a closed state blocking the air flow between the first space and the second space. The working machine according to Claim 1.

3. The power part includes a hydraulic oil tank for storing hydraulic oil, and a control valve for switching the flow of the hydraulic oil, and is provided with a controller for controlling the switching between the open state and the closed state of the shutter based on the temperature of the hydraulic oil and / or the temperature of the power storage device. The working machine according to Claim 2.

4. The controller sets the shutter in the open state when the temperature of the power storage device is equal to or higher than a temperature threshold for the power storage device and the temperature of the hydraulic oil is lower than a hydraulic oil temperature threshold, and sets the shutter in the closed state when either the temperature of the power storage device is lower than the temperature threshold for the power storage device or the temperature of the hydraulic oil is equal to or higher than the hydraulic oil temperature threshold. The working machine according to Claim 3.

5. The controller sets the shutter in the open state during a warm-up operation for raising the temperature of the power part, and sets the shutter in the closed state during a normal operation for operating the operating part after the warm-up operation. The working machine according to Claim 3.

6. The controller starts charging the power storage device with the shutter in the closed state, and monitors the charging state of the power storage device during charging and sets the shutter in the open state before the charging of the power storage device is completed. The working machine according to Claim 3.

7. When the air flow between the first space and the second space is blocked by the shutter, the main body portion has a communication port for discharging the air above and / or below the first space. The working machine according to any one of claims 2 to 5.

8. The switching portion is installed on a side wall surrounding the second space of the main body portion, and includes a side shutter that opens and closes between the second space and the outside. The side shutter is opened as the shutter is opened and closed as the shutter is closed. The working machine according to any one of claims 2 to 5.

9. The main body portion arranges the power portion and the power storage device in the same space. The working machine according to claim 1.

10. The main body portion has a lower traveling body and an upper revolving body rotatably provided on the lower traveling body. The operating portion includes a boom, an arm, and a bucket which are attachments provided on the upper revolving body. The working machine according to claim 1.

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