Work machine

Abstract

To provide a work machine capable of charging while enabling safe getting on / off from an operation unit.SOLUTION: This work machine comprises: a connector to which a cable for charging a battery unit that supplies power to an electric motor is connected; an operation unit disposed on one side in a width direction; and a machine chamber having an openable / closable cover and the connector disposed therein. The machine chamber is disposed on the other side in the width direction with respect to at least the operation unit.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Conventionally, electric shovels equipped with a charging port for supplying power to a battery have been known. For example, in the electric shovel disclosed in Patent Document 1, the charging port is provided on the upper rotating body at a position lower than the bottom of the door on the surface on which the cabin door is provided. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-125756 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Patent Document 1, when a cable is connected to the charging port to charge the battery, the cable is located below the driver's entrance (cabin door), so when an operator tries to open or close the cabin door to get in or out while charging, the operator's foot may get caught in the cable. In other words, the cable may prevent the operator from getting in or out.

[0005] The present invention has been made to solve the above problems, and its object is to provide a work machine that can be charged while allowing safe entry and exit from the driver's section. [Means for solving the problem]

[0006] A work machine according to one aspect of the present invention is a work machine equipped with a connector to which a cable for charging a battery unit that supplies power to an electric motor is connected, and is equipped with a driving unit arranged on one side in the width direction, and a machine room having an openable and closable cover and in which the connector is arranged, the machine room being arranged at least adjacent to the driving unit on the other side in the width direction. [Effects of the Invention]

[0007] According to the above configuration, charging can be performed while allowing passengers to safely get on and off the driver's section. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a schematic configuration of a hydraulic excavator, which is an example of a work machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram schematically showing the configuration of an electrical system and a hydraulic system of the hydraulic excavator. [Figure 3] FIG. 2 is a perspective view of an upper rotating body provided in the hydraulic excavator. [Figure 4] FIG. 2 is a schematic plan view of an upper rotating body. [Figure 5] FIG. 2 is a perspective view of the upper rotating body with the cover open. [Figure 6] FIG. 2 is an enlarged perspective view showing a connector arranged in a machine room of the hydraulic excavator. [Figure 7] FIG. 2 is a perspective view showing a state in which a first cable is connected to a first connector. [Figure 8] FIG. 2 is a perspective view of the upper rotating body viewed from below with the cover closed. [Figure 9] FIG. 10 is a perspective view showing the second connector before the second cable is connected. [Figure 10] FIG. 10 is a perspective view showing a state in which the second cable is connected to the second connector. [Figure 11] FIG. 2 is a side view schematically showing the internal configuration of the machine room. DETAILED DESCRIPTION OF THE INVENTION

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

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

[0011] Here, directions are defined as follows: The direction in which the operator (operator, driver) seated in the driver's seat 41a of the upper rotating body 4 faces forward is defined as the forward direction, and the opposite direction is defined as the rearward direction. Therefore, when the upper rotating body 4 is not rotating relative to the undercarriage 2 (swing angle 0°), the fore-and-aft direction of the upper rotating body 4 coincides with the direction in which the undercarriage 2 moves forward and backward. Also, the left side as seen from the operator seated in the driver's seat 41a is defined as the "left," and the right side is defined as the "right." Furthermore, the direction of gravity, which is perpendicular to the fore-and-aft direction and the left-and-right direction, is defined as the up-and-down direction, with the upstream side of the direction of gravity defined as the "up" and the downstream side defined as the "down." In the drawings, the hydraulic excavator 1 is shown in a state in which the upper rotating body 4 is not rotating relative to the undercarriage 2. Also, in the drawings, the forward direction is indicated by the symbol "F," the rearward by the symbol "B," the upward direction by the symbol "U," and the downward direction by the symbol "D." The left-and-right direction of the hydraulic excavator 1 or the upper rotating body 4 is also referred to as the width direction.

[0012] The lower traveling structure 2 includes a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, to move the hydraulic excavator 1 forward and backward. The lower traveling structure 2 further includes a blade for performing ground leveling work and a blade cylinder for rotating the blade in the up and down direction, but these are not shown in FIG. 1 for convenience.

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

[0014] The boom 31, the arm 32, and the bucket 33 are driven by a boom cylinder 31a, an arm cylinder 32a, and a bucket cylinder 33a, respectively. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are configured by hydraulic cylinders.

[0015] The base end of the boom 31, i.e., the end of the boom 31 opposite the side connected to the arm 32, is swingably connected to the tip end 42a of the revolving frame 42 via a bracket 34. That is, the hydraulic excavator 1 of this embodiment has a boom swing function in which the boom 31 swings left and right from the tip end 42a. The revolving frame 42 is provided with a swing cylinder 42b (see FIG. 3) for swinging the boom 31.

[0016] The boom 31 has a shape bent at an obtuse angle and is rotated up and down by extension and retraction of the boom cylinder 31a. The boom cylinder 31a has a base end supported by the tip end 42a of the upper rotating body 4 and a tip end connected to the bent portion of the boom 31, allowing it to move telescopically. The arm 32 is rotatably connected to the tip end of the boom 31. The arm 32 is rotated up and down by extension and retraction of the arm cylinder 32a. The arm cylinder 32a has a base end supported by the boom 31 and a tip end connected to the base end of the arm 32, allowing it to move telescopically. The bucket 33 is connected to the tip end of the arm 32 via a link mechanism 35 and is rotated up and down by extension and retraction of the bucket cylinder 33a. The bucket cylinder 33a has a base end supported by the arm 32 and a tip end connected to the link mechanism 35, allowing it to move telescopically.

[0017] The upper rotating body 4 is located above the lower traveling body 2 and is provided so as to be able to rotate relative to the lower traveling body 2. A driving unit 41, a rotating frame 42, a rotating motor 43, and a machine room 44 are arranged on the upper rotating body 4. The upper rotating body 4 rotates via a rotating bearing (not shown) by driving the rotating motor 43, which is a hydraulic motor.

[0018] A driver's seat 41a is disposed in the driver's section 41. Various operating levers 41b are disposed around the driver's seat 41a. When an operator sits on the driver's seat 41a and operates the operating levers 41b, a hydraulic actuator 73 (see FIG. 2), which will be described later, is driven. This allows the lower traveling body 2 to travel, the work implement 3 to perform excavation work, the upper rotating body 4 to rotate, and so on.

[0019] A battery unit 51 is disposed on the upper swing body 4. The battery unit 51 is configured by, for example, a lithium ion battery unit. The battery unit 51 stores electric power and supplies electric power to an electric motor 61 (see FIG. 2) to drive the electric motor 61.

[0020] A lead battery 52 is also disposed on the upper swing body 4. The lead battery 52 outputs a low-voltage (e.g., 12 V) DC voltage. The output from the lead battery 52 is supplied as a control voltage to, for example, a system controller 67 (see FIG. 2) or the like.

[0021] The hydraulic excavator 1 may be configured to use hydraulic equipment such as hydraulic actuators (e.g., hydraulic motors and hydraulic cylinders) in combination with electrically driven actuators. Electrically driven actuators include, for example, electric travel motors, electric cylinders, and electric swing motors.

[0022] [2. Electrical and hydraulic system configuration] 2 is a block diagram showing a schematic configuration of the electrical system and hydraulic system of the hydraulic excavator 1. For convenience, in the figure, paths through which current or electrical signals flow are indicated by solid lines, and paths through which hydraulic oil flows are indicated by dashed lines.

[0023] The hydraulic excavator 1 includes, in the machine room 44, an electric motor 61, a normal charger 62, an inverter 63, a PDU (Power Distribution Unit) 64, a junction box 65, a DC-DC converter 66, and a system controller 67. The system controller 67 is configured as an electronic control unit also called an ECU (Electronic Control Unit), and performs electrical control of each part of the hydraulic excavator 1.

[0024] The electric motor 61 is driven by electric power supplied from the battery unit 51 via a junction box 65 and an inverter 63. The electric motor 61 is configured as a permanent magnet motor or an induction motor.

[0025] The normal charger 62 (also called a power supply) converts AC voltage supplied from a first external power source 101, which is an external power source, via a cable CA (particularly a first cable CA1), into DC voltage. Here, a first connector NT1 serving as a connector NT is disposed inside the machine room 44. The first connector NT1 is a connector (also called a socket) for normal charging.

[0026] By connecting the first cable CA1 to the first connector NT1, AC voltage from the first external power supply 101 is supplied to the normal charger 62 via the first cable CA1 and the first connector NT1. The voltage (DC voltage) output from the normal charger 62 is supplied to the battery unit 51 via the junction box 65 and the PDU 64. This charges the battery unit 51. Charging the battery unit 51 at this time is also referred to as normal charging.

[0027] A second connector NT2 serving as the connector NT is also disposed inside the machine chamber 44. That is, the connector NT includes a first connector NT1 and a second connector NT2. The second connector NT2 is a connector (socket) for rapid charging. An AC voltage supplied from a second external power source 201 for rapid charging is converted into a DC voltage by the rapid charger 202. A base end of a cable CA (particularly, the second cable CA2) is connected to the rapid charger 202.

[0028] By connecting the tip of the second cable CA2 to the second connector NT2, DC voltage from the quick charger 202 is supplied to the battery unit 51 via the second cable CA2, the second connector NT2, the junction box 65, and the PDU 64. This charges the battery unit 51. Charging the battery unit 51 at this time is also referred to as quick charging.

[0029] As described above, the hydraulic excavator 1 as a work machine of this embodiment is provided with connectors NT (first connector NT1, second connector NT2) to which cables CA (first cable CA1, second cable CA2) are connected for charging the battery unit 51 that supplies power to the electric motor 61. The arrangement of the connectors NT in the machine room 44 will be described in detail later. In this embodiment, the cable CA collectively refers to a wiring portion from which electrical wiring extends and a plug (the portion that is inserted into the connector NT) that is provided at the tip of the wiring portion.

[0030] The inverter 63 converts the DC voltage supplied from the battery unit 51 into AC voltage and supplies it to the electric motor 61. This causes the electric motor 61 to rotate. The supply of AC voltage (current) from the inverter 63 to the electric motor 61 is performed based on a rotation command output from a system controller 67.

[0031] The PDU 64 is a battery control unit that controls an internal battery relay to control the input and output of the battery unit 51. The junction box 65 includes a charger relay, an inverter relay, a fuse, etc. The voltage output from the battery unit 51 is supplied to the inverter 63 via the PDU 64 and the junction box 65.

[0032] The DC-DC converter 66 reduces a high voltage (e.g., 300 V) DC voltage supplied from the battery unit 51 via the PDU 64 and the junction box 65 to a low voltage (e.g., 12 V). The voltage output from the DC-DC converter 66 is supplied to the system controller 67 and the like, similar to the output from the lead battery 52.

[0033] A charge stop switch 68 is provided near the connector NT in the machine room 44. When charging of the battery unit 51 is completed, the operator operates (e.g., presses) the charge stop switch 68 and then unplugs the cable CA from the connector NT. When the charge stop switch 68 is operated, the system controller 67 controls the PDU 64 or the junction box 65 based on a stop signal from the charge stop switch 68 to cut off the charging path to the battery unit 51. This allows the operator to safely unplug the cable CA from the connector NT.

[0034] A plurality of hydraulic pumps 71 are connected to a rotary shaft (output shaft) of the electric motor 61. The plurality of hydraulic pumps 71 include variable displacement pumps and fixed displacement pumps. In FIG. 2, only one hydraulic pump 71 is shown as an example. Each hydraulic pump 71 is connected to a hydraulic oil tank 74.

[0035] When the hydraulic pump 71 is driven by the electric motor 61, hydraulic oil in the hydraulic oil tank 74 is supplied to the hydraulic actuator 73 via the control valve 72. This drives the hydraulic actuator 73. That is, the hydraulic oil tank 74 stores hydraulic oil discharged by the hydraulic pump 71 driven by the electric motor 61. The control valve 72 is a directional switching valve that controls the flow direction and amount of hydraulic oil supplied to the hydraulic actuator 73. The hydraulic actuator 73 includes a hydraulic motor (for example, the left and right traveling motors 22 and the swing motor 43 in FIG. 1) and a hydraulic cylinder (for example, the boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a in FIG. 1).

[0036] [3. Layout of each part in the machine room] FIG. 3 is a perspective view of the upper rotating body 4. FIG. 4 is a schematic plan view of the upper rotating body 4. In the upper rotating body 4, the driver's unit 41 is positioned to the left of the center in the width direction. In other words, the driver's unit 41 is positioned on one side (the left side) in the width direction. The machine room 44 is positioned below, to the right, and behind the driver's unit 41. Here, below the driver's unit 41 includes below the driver's seat 41a. The right side of the driver's unit 41 includes the side immediately to the right of the driver's seat 41a. In this way, in the upper rotating body 4, the machine room 44 is positioned at least next to the driver's unit 41 on the other side (the right side) in the width direction.

[0037] As shown in FIG. 4, the machinery chamber 44 includes a connector accommodating portion 440. A connector NT, which will be described later, is disposed in the connector accommodating portion 440. The connector accommodating portion 440 is disposed on the right side of the driving unit 41, i.e., on the other side in the width direction. Therefore, the connector NT is disposed on the right side of the driving unit 41, i.e., on the other side in the width direction, within the machinery chamber 44. Note that the connector accommodating portion 440 may also accommodate components other than the connector NT. In this embodiment, the connector accommodating portion 440 also accommodates the hydraulic oil tank 74 and the lead battery 52 (both see FIG. 2) in addition to the connector NT.

[0038] The machine room 44 has a cover 45. The cover 45 is disposed on the right side of the driver's section 41 so as to be able to open and close. In particular, the cover 45 has a rotation shaft (not shown) at its rear end. The rotation shaft extends in the width direction. Therefore, the cover 45 rotates in the vertical direction with the rotation shaft as a fulcrum. When the cover 45 rotates upward, it is in an open state, and when it rotates downward, it is in a closed state. In other words, the cover 45 rotates to open from the front.

[0039] FIG. 5 is a perspective view of the upper rotating body 4 with the cover 45 open. As shown in the figure, when the cover 45 is open, the connector NT, hydraulic oil tank 74, and lead battery 52 arranged inside the machine room 44 (particularly the connector housing portion 440) are exposed. In other words, the connector NT, hydraulic oil tank 74, and lead battery 52 are located below the cover 45 inside the machine room 44 when the cover 45 is in the closed state shown in FIG. 3. In this way, the hydraulic excavator 1 has an openable cover 45 and is provided with a machine room 44 in which the connector NT is arranged. Note that the outline arrow in FIG. 5 indicates the direction in which the connector NT faces inside the machine room 44. In other words, in this embodiment, the connector NT is arranged facing forward inside the machine room 44.

[0040] 6 is an enlarged perspective view of the connector NT in the machinery chamber 44. As described above, the connector NT includes a first connector NT1 for normal charging and a second connector NT2 for rapid charging. The first connector NT1 and the second connector NT2 are arranged side by side in the width direction. In particular, the first connector NT1 is arranged to the right of the second connector NT2, i.e., on the other side in the width direction.

[0041] A cap CP is rotatably supported on the first connector NT1. The cap CP is provided to protect the connection port (insertion port) into which the first cable CA1 (see FIG. 7) for normal charging is inserted. The rotation axis of the cap CP extends vertically and is located on the left side of the connection port on the device body. When normal charging is not being performed, the connection port is closed by the cap CP. When normal charging is being performed, the cap CP is opened to expose the connection port. This allows the first cable CA1 to be connected to the connection port of the first connector NT1. FIG. 7 shows the state when the cap CP is open and the first cable CA1 is connected to the first connector NT1.

[0042] After connecting the first cable CA1 to the first connector NT1, the operator closes the cover 45. FIG. 8 is a perspective view of the upper rotating body 4 when viewed from below with the cover 45 closed. A communication opening 452a is provided on the front side of the cover 45. That is, the cover 45 has the communication opening 452a. The communication opening 452a is an opening through which the cable CA connected to the connector NT in the machine room 44 passes. Details of the communication opening 452a will be described later.

[0043] The first cable CA1 connected to the first connector NT1 is pulled out from the communication opening 452a when the cover 45 is closed. The cover 45 is provided with a key cylinder 46. When the cover 45 is closed, inserting a key into the key cylinder 46 to lock it prevents the cover 45 from opening. This prevents third parties from accessing the machinery compartment 44 during normal charging. Therefore, it is possible to prevent third parties from tampering with the machinery compartment 44 while charging is in progress, for example.

[0044] On the other hand, when performing quick charging, as shown in FIG. 9, the cover 45 is opened, and the second cable CA2 is inserted into the second connector NT2 with the cap CP of the first connector NT1 closed. FIG. 10 shows the state in which the second cable CA2 is connected to the second connector NT2. After connecting the second cable CA2 to the second connector NT2, the operator closes the cover 45. The second cable CA2 connected to the second connector NT2 is pulled out from the communication opening 452a (see FIG. 8) with the cover 45 closed. Note that while FIGS. 9 and 10 show a configuration in which two wires are connected to one plug of the second cable CA2, the second cable CA2 may also be configured by combining the two wires into one wiring section and connecting the single wiring section to a plug.

[0045] As described above, the machine chamber 44, in which the connector NT is disposed, has an openable / closable cover 45. In this configuration, the connector NT inside the machine chamber 44 can be exposed by opening the cover 45. This makes it possible to charge the battery unit 51 by connecting a charging cable CA to the connector NT. On the other hand, by closing the cover 45 of the machine chamber 44, the connector NT can be covered and protected by the cover 45.

[0046] Furthermore, in a configuration in which the driving unit 41 is disposed on one side (e.g., the left side) in the width direction of the hydraulic excavator 1, the machine room 44 is disposed at least adjacent to the driving unit 41 on the other side (e.g., the right side) in the width direction. In this configuration, the connector NT can be disposed inside the machine room 44 adjacent to the driving unit 41 on the other side in the width direction. Furthermore, because the machine room 44 is located on the other side in the width direction of the driving unit 41, the operator cannot get on or off the driving unit 41 from the other side in the width direction, but must get on or off from one side in the width direction. In this case, the side from which the operator gets on or off the driving unit 41 (one side in the width direction) is opposite the side from which the connector NT is disposed inside the machine room 44 (the other side in the width direction). Therefore, when the operator gets on or off the driving unit 41 (from one side in the width direction) while the battery unit 51 is being charged by connecting the cable CA to the connector NT (on the other side in the width direction), the risk of the cable CA interfering with the operator's getting on or off the driving unit 41 can be reduced. As a result, charging can be performed while allowing safe getting on and off the driving unit 41.

[0047] From the viewpoint of ensuring that the side on which the operator gets on and off the driving unit 41 and the side on which the connector NT is arranged on the driving unit 41 are opposite in the width direction, it is desirable that the connector NT be arranged on the other side in the width direction from the driving unit 41, as shown in Fig. 4. In other words, it is desirable that the connector accommodating portion 440 that accommodates the connector NT be arranged on the other side in the width direction from the driving unit 41.

[0048] As shown in Fig. 5, the machine room 44 has an opening 44a. For convenience, the opening 44a is indicated by a thick dashed line in Fig. 5. The opening 44a has a shape smaller than the outer shape of the cover 45 and is covered by the cover 45. In this embodiment, the opening 44a is located at the upper right side of the driver's section 41 and extends obliquely downward from the rear to the front.

[0049] In this embodiment, as described above, the connector NT is disposed in the machine room 44 facing forward. That is, the orientations (the connection ports) of the first connector NT1 and the second connector NT2 are aligned across the opening 44a. With the connector NT disposed in this manner, the first cable CA1 can be connected to the first connector NT1 from the front so as to cross the opening 44a. Similarly, the second cable CA2 can be connected to the second connector NT2 from the front so as to cross the opening 44a.

[0050] The orientation of the first connector NT1 and the second connector NT2 in the machinery room 44 need only be a direction that crosses the opening 44a, and is not limited to facing forward. For example, the first connector NT1 and the second connector NT2 may be oriented diagonally upward or downward relative to the front.

[0051] From the above, from the viewpoint of enabling the cable CA to be inserted into the connector NT from outside the machine chamber 44 through the opening 44a when the cover 45 is open, it can be said that the connector NT is desirably positioned as follows inside the machine chamber 44. That is, the connector NT is desirably positioned so that it faces the outside of the machine chamber 44 through the opening 44a when the cover 45 is open.

[0052] However, for example, if the cable CA is pulled out from the connector NT in the width direction of the hydraulic excavator 1 while charging, there is a risk that the cable CA may come into contact with a surrounding obstacle. In this embodiment, by connecting the cable CA to the connector NT from the front, the cable CA can be pulled out forward from the connector NT while charging. This reduces the risk that the cable CA will come into contact with an obstacle present in the surrounding area (particularly an obstacle adjacent to the cable CA in the width direction). In order to enable such forward pulling of the cable CA, it is desirable that the connector NT be positioned so that it faces forward through the opening 44a when the cover 45 is open.

[0053] FIG. 11 is a side view that schematically shows the internal configuration of the machinery chamber 44 (particularly the connector accommodating portion 440). For convenience, the right wall (right hood) of the machinery chamber 44 is not shown in FIG. 11. A hydraulic oil tank 74 is disposed inside the machinery chamber 44. In this embodiment, the connector NT is disposed in the machinery chamber 44, offset in both the front-to-rear and up-down directions relative to the hydraulic oil tank 74. Specifically, the connector NT is disposed in the machinery chamber 44 rearward of the hydraulic oil tank 74 and above the hydraulic oil tank 74.

[0054] For example, if the connector NT (first connector NT1 and second connector NT2) is disposed above (directly above) the hydraulic oil tank 74, there is a concern that the presence of the connector NT may make it difficult to perform maintenance such as refilling hydraulic oil into the hydraulic oil tank 74. In particular, if the refill port of the hydraulic oil tank 74 is provided on the top surface of the hydraulic oil tank 74, this concern increases. From the perspective of reducing such concerns, it is desirable to dispose the connector NT offset in the front-to-rear direction relative to the hydraulic oil tank 74 within the machinery room 44, as in this embodiment.

[0055] Furthermore, for example, if the hydraulic oil tank 74 is disposed in front of (directly in front of) the connector NT, it becomes difficult to connect the cable CA to the connector NT from the front, and a design change such as changing the orientation of the connector NT is required. In order to enable connection of the cable CA without changing the orientation of the connector NT through a design change, it is desirable to dispose the connector NT and the hydraulic oil tank 74 vertically offset from each other within the machinery room 44, as in this embodiment.

[0056] It would be desirable to be able to use the space above the hydraulic oil tank 74 not only as a work space for maintenance such as replenishing hydraulic oil to the hydraulic oil tank 74, but also as a space for arranging the cable CA connected to the connector NT, in order to make effective use of the space. In this regard, it is desirable to arrange the connector NT behind and above the hydraulic oil tank 74 within the machinery room 44, as in this embodiment.

[0057] When the cable CA is connected to the connector NT from the front, the cable CA passes above the hydraulic oil tank 74. However, because the cable CA is thin, the cable CA does not occupy the entire space above the hydraulic oil tank 74. Therefore, even when the cable CA passes above the hydraulic oil tank 74, it is still possible to replenish the hydraulic oil tank 74 with hydraulic oil from above.

[0058] [4. Cover communication port] Next, the cover 45 and the communication opening 452a will be described in detail with reference to Figures 3 to 5, 8, and 11. The cover 45 described above has a cover main body 451 and a protrusion 452. The cover main body 451 has a rotation shaft extending in the left-right direction at its rear end, and is rotatable in the up-down direction.

[0059] The cover body 451 is disposed on the right side of the driving unit 41 (see FIG. 3). In this embodiment, the driving unit 41 is disposed on one side (left side) in the width direction, and therefore the cover body 451 can be said to be disposed on the other side (right side) in the width direction of the driving unit 41. In the closed state, the cover body 451 has a curved shape in which the front side hangs down more than the rear side (see FIGS. 3 and 11).

[0060] The protrusion 452 is a portion that protrudes outward from the cover body 451 by recessing a portion of the cover body 451 outward. Here, the "outside of the cover" refers to the side of the cover body 451 opposite the inside of the machine chamber 44 (the side where the connector NT and the like are arranged), that is, the outside of the machine chamber 44. The protrusion 452 is located at the front lower part of the cover body 451 in the closed state shown in FIG. 3, and has the communication opening 452a at its lower end. Therefore, the communication opening 452a is located forward of the connector NT in the machine chamber 44 when the cover 45 is closed.

[0061] When the cover 45 is closed, the communication opening 452a is located forward of the connector NT, so that the cable CA connected to the connector NT can be pulled forward through the communication opening 452a even when the cover 45 is closed during charging of the battery unit 51 (see FIG. 2). Therefore, as described above, the risk of the cable CA coming into contact with surrounding obstacles is reduced.

[0062] 3 and 11, communication opening 452a is located below connector NT when cover 45 is closed. During charging, cable CA connected to connector NT hangs down due to its own weight. By locating communication opening 452a below connector NT, cable CA can be easily pulled out through communication opening 452a without resisting gravity.

[0063] As shown in FIG. 8, communication opening 452a opens downward when cover 45 is closed. That is, the upper part of communication opening 452a is covered by the wall portion of protrusion 452, the lower part of communication opening 452a is an open space, and communication opening 452a opens toward this open section. This configuration reduces the intrusion of rainwater and the like into machine room 44 through communication opening 452a. Furthermore, during charging, cable CA, which is pulled forward from connector NT and hanging downward, is pulled out of communication opening 452a in the same direction. In this case, the load on cable CA is reduced, and damage to cable CA is also reduced, compared to when cable CA is pulled out by bending it left and right, for example.

[0064] In this way, in order to reliably realize a configuration in which the communication opening 452a opens downward, it is desirable that the protrusion 452 be located at the front lower part of the cover main body 451 and have the communication opening 452a at its lower end, as in this embodiment.

[0065] [5. Connector and charging stop switch placement] Next, the arrangement of the connector NT inside the machinery compartment 44 will be described. As shown in Fig. 6, a first connector NT1 for normal charging is arranged inside the machinery compartment 44, and a second connector NT2 for rapid charging is arranged next to the first connector NT1. In this embodiment, the first connector NT1 and the second connector NT2 are arranged next to each other in the left-right direction (width direction).

[0066] In particular, the first connector NT1 is disposed to the right of the second connector NT2, i.e., on the other side in the width direction. This is because, in the normal use state of the first connector NT1, the vertical rotation axis of the cap CP is located on one side in the width direction (on the left side of the machine body) with respect to the connection port of the first connector NT1, and this cap CP is utilized as a means for blocking not only the front of the first connector NT1 but also the front of the second connector NT2, as will be described later. Note that, if the vertical rotation axis of the cap CP of the first connector NT1 is configured to be located on the other side in the width direction (on the right side of the machine body) with respect to the connection port of the first connector NT1, the first connector NT1 may be disposed to the left of the second connector NT2, i.e., on one side in the width direction.

[0067] As described above, the first connector NT1 is connected to the first cable CA1 for charging (normal charging) the battery unit 51. The second connector NT2 is connected to the second cable CA2 for charging (quick charging) the battery unit 51. That is, the cable CA includes the first cable CA1 connected to the first connector NT1 and the second cable CA2 connected to the second connector NT2.

[0068] When performing normal charging, as shown in Figure 7, the cap CP of the first connector NT1 is opened and the first cable CA1 is connected to the first connector NT1. At this time, the open cap CP is positioned in front of the second connector NT2. This makes it physically impossible to insert the second cable CA2 into the second connector NT2.

[0069] On the other hand, when performing quick charging, the second cable CA2 is connected to the second connector NT2 with the cap CP of the first connector NT1 closed, as shown in Figures 9 and 10. With the second cable CA2 connected to the second connector NT2, when the cap CP of the first connector NT1 is opened, the cap CP comes into contact with the second cable CA2 (see Figure 10). Therefore, even if you try to insert the first cable CA1 into the first connector NT1, the tip (plug) of the first cable CA1 comes into contact with the cap CP, making it impossible to insert the first cable CA1 into the first connector NT1.

[0070] In other words, when the second cable CA2 is inserted into the second connector NT2, the presence of the second cable CA2 prevents the cap CP from opening sufficiently to the position where the first cable CA1 can be inserted into the first connector NT1. As a result, the cap CP interferes with the insertion of the first cable CA1, making it physically impossible to insert the first cable CA1 into the first connector NT1.

[0071] Thus, from the perspective of preventing simultaneous connection of two types of cables CA to the respective connectors NT with a simple structure that rotatably supports the cap CP, that is, preventing simultaneous connection of the first cable CA1 to the first connector NT1 and the second cable CA2 to the second connector NT2, the following configuration is desirable: That is, it is desirable that the cap CP rotates to a position where it crosses in front of the second connector NT2 (for example, the position shown in FIG. 7) when connecting the first cable CA1 to the first connector NT1, and rotates to a position where it crosses in front of the first connector NT1 (for example, the closed position shown in FIG. 9) when connecting the second cable CA2 to the second connector NT2.

[0072] In order to easily prevent simultaneous connection of two types of cables CA to the connector NT with a simple configuration in which the rotational position of the cap CP is switched between a position crossing in front of the second connector NT2 and a position crossing in front of the first connector NT1, it is desirable to arrange the first connector NT1 with the cap CP and the second connector NT2 side by side in the width direction.

[0073] Furthermore, when the first connector NT1 and the second connector NT2 are arranged side by side in the width direction, the second cable CA2 can be connected to the second connector NT2 from the same direction (e.g., from the front) as the direction in which the first cable CA1 is connected to the first connector NT1. This allows the second cable CA2 to be routed in the same manner as the first cable CA1. For example, during charging using the second cable CA2, the second cable CA2 can be passed through the communication opening 452a used to pass the first cable CA1 and drawn out to the outside of the cover 45. This eliminates the need to provide a separate communication opening dedicated to drawing the second cable CA2 out to the outside of the cover 45.

[0074] In a hydraulic excavator 1 that performs normal charging and rapid charging, in order to prevent simultaneous connection of two types of cables CA, it is desirable that the first connector NT1 be a normal charging connector to which a normal charging cable as the first cable CA1 is connected, and that the second connector NT2 be a rapid charging connector to which a rapid charging cable as the second cable CA2 is connected.

[0075] 6, 7, 9, and 10, a charge stop switch 68 is disposed inside the machine chamber 44. The charge stop switch 68 is an operation receiving unit that receives an operation to stop charging of the battery unit 51 (see FIG. 2, etc.). The charge stop switch 68 is disposed on the right side of the first connector NT1 and the second connector NT2, i.e., on the other side in the width direction.

[0076] With the charging stop switch 68 positioned in this manner, for example, an operator can easily access the charging stop switch 68 from the other side in the width direction to perform the charging stop operation. Furthermore, because the charging stop switch 68 is positioned near the first connector NT1 and the second connector NT2, if the first connector NT1 has an interlock mechanism, for example, the charging stop switch 68 can also function as an interlock release switch. Note that an interlock mechanism refers to a structure in which an interlock is activated and the cable connected to the connector cannot be disconnected unless the lock release switch is pressed.

[0077] [6. Modifications] In this embodiment, the above-described configuration for preventing simultaneous connection of two types of cables CA has been described as being applied to a configuration in which the connector NT is located to the right of the driving unit 41 in the machine room 44, but the application is not limited to this. In other words, even if the connector NT is located in a position other than the right side of the driving unit 41, the configuration of this embodiment for preventing simultaneous connection of two types of cables CA can be applied.

[0078] Therefore, it can be said that the hydraulic excavator 1 as a work machine described in this embodiment may have the following modified configuration. That is, it includes a first connector NT1 that connects a first cable CA1 for externally charging electric power to a battery unit 51, which is the power source for the electric motor 61, a second connector NT2 that is arranged alongside the first connector NT1 and connects a second cable CA2 for externally charging electric power to the battery unit 51, and a cap CP that is rotatably supported on the first connector NT1 and covers an end of the second connector NT2 in a manner that allows it to be opened and closed. When the second cable CA2 is connected to the second connector NT2, the cap CP prevents the first connector NT1 from connecting to the first cable CA1, and when the first cable CA1 is connected to the first connector NT1, the cap CP prevents the second connector NT2 from connecting to the second cable CA2.

[0079] In the hydraulic excavator 1 of the above-described modified example, it is desirable that the first connector NT1 and the second connector NT2 are arranged side by side on the left and right.

[0080] [7. Supplementary Information] In the above, a hydraulic excavator 1, which is a construction machine, has been described as an example of an electrically powered work machine, but the work machine is not limited to the hydraulic excavator 1 and may be other construction machines such as a wheel loader, a compact track loader, etc. Furthermore, the work machine may be agricultural machinery such as a combine harvester or a tractor.

[0081] [8. Notes] The hydraulic excavator 1 described in this embodiment can also be expressed as follows:

[0082] The work machine in Appendix (1) is A work machine having a connector to which a cable for charging a battery unit that supplies power to an electric motor is connected, a driving unit disposed on one side in the width direction; a machine chamber having an openable cover and in which the connector is disposed, The machine room is disposed adjacent to at least the driving section on the other side in the width direction.

[0083] The work machine of supplementary note (2) is the work machine of supplementary note (1), the machine chamber includes a connector accommodating portion in which the connector is disposed, The connector accommodating portion is disposed on the other side in the width direction relative to the driving portion.

[0084] The work machine of supplementary note (3) is a work machine according to supplementary note (1) or (2), the machine chamber has an opening covered by the cover, The connector is disposed facing the outside of the machine chamber through the opening when the cover is open.

[0085] The work machine of supplementary note (4) is the work machine described in supplementary note (3), a hydraulic oil tank disposed inside the machine room and configured to store hydraulic oil discharged by a hydraulic pump driven by the electric motor; The connector is disposed offset in the front-rear direction relative to the hydraulic oil tank.

[0086] The work machine of supplementary note (5) is the work machine according to supplementary note (4), The connector is disposed offset in the vertical direction relative to the hydraulic oil tank.

[0087] The work machine of supplementary note (6) is the work machine according to supplementary note (5), The connector is located rearward and above the hydraulic oil tank.

[0088] The work machine of supplementary note (7) is a work machine according to any one of supplementary notes (3) to (6), The connector is positioned facing forward (through the opening when the cover is open).

[0089] The work machine of supplementary note (8) is the work machine according to supplementary note (7), the cover has a communication opening through which the cable connected to the connector passes, The communication opening is located forward of the connector when the cover is closed.

[0090] The work machine of supplementary note (9) is the work machine according to supplementary note (8), The communication opening is located below the connector when the cover is closed.

[0091] The work machine of supplementary note (10) is the work machine according to supplementary note (9), The communication port opens downward when the cover is closed.

[0092] The work machine of supplementary note (11) is a work machine according to any one of supplementary notes (8) to (10), The cover is a cover body disposed on the other side of the driving unit in the width direction; a protrusion formed by a part of the cover body protruding outward from the cover, The cover body has a curved shape in which the front side hangs down relative to the rear side in a closed state, The protrusion is located at the front lower portion of the cover body when the cover is closed, and has the communication port at its lower end.

[0093] The work machine of supplementary note (12) is a work machine according to any one of supplementary notes (1) to (11), The connector includes a first connector and a second connector, the cables include a first cable connected to the first connector and a second cable connected to the second connector; the first connector and the second connector are arranged side by side in the machine room, the first connector has a cap that is rotatably supported, The cap is When connecting the first cable to the first connector, the connector is rotated to a position where it crosses the front of the second connector, When the second cable is connected to the second connector, the connector rotates to a position where it crosses the front of the first connector.

[0094] The work machine of supplementary note (13) is the work machine according to supplementary note (12), The first connector and the second connector are arranged side by side in the width direction.

[0095] The work machine of supplementary note (14) is the work machine according to supplementary note (12) or (13), a charging stop switch disposed inside the machine room and configured to stop charging of the battery unit; The charge stop switch is disposed on the other side in the width direction relative to the first connector and the second connector.

[0096] The work machine of supplementary note (15) is a work machine according to any one of supplementary notes (12) to (14), the first connector is a normal charging connector to which a normal charging cable serving as the first cable is connected, The second connector is a quick-charging connector to which a quick-charging cable serving as the second cable is connected.

[0097] Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these, and the invention can be expanded or modified without departing from the spirit of the invention. [Industrial Applicability]

[0098] The present invention can be used in work machines such as construction machines and agricultural machines. [Explanation of symbols]

[0099] 1. Hydraulic excavator (work machine) 41 Driving Department 44 Machine room 44a opening 45 Cover 51 Battery unit 61 Electric motor 68 Charging stop switch 74 Hydraulic oil tank 71 Hydraulic pump 440 Connector housing 451 Cover body 452 Protrusion 452a Communication port CA Cable CA1 1st Cable CA2 2nd Cable CP Cap NT Connector NT1 1st connector NT2 2nd Connector

Claims

1. A work machine having a connector to which a cable for charging a battery unit that supplies power to an electric motor is connected, a driving unit disposed on one side in the width direction; a machine chamber having an openable cover and in which the connector is disposed, The machine room is disposed adjacent to at least the driving section on the other side in the width direction.

2. the machine chamber includes a connector accommodating portion in which the connector is disposed, The work machine according to claim 1 , wherein the connector housing portion is disposed on the other side in the width direction relative to the driving portion.

3. the machine chamber has an opening covered by the cover, The work machine according to claim 1 , wherein the connector is disposed facing outward from the machine compartment through the opening when the cover is open.

4. a hydraulic oil tank disposed inside the machine room and configured to store hydraulic oil discharged by a hydraulic pump driven by the electric motor; The work machine according to claim 3 , wherein the connector is disposed offset in the front-to-rear direction with respect to the hydraulic oil tank.

5. The work machine according to claim 4 , wherein the connector is disposed offset in the vertical direction with respect to the hydraulic oil tank.

6. The work machine according to claim 5 , wherein the connector is located rearward and above the hydraulic oil tank.

7. The work machine of claim 3 , wherein the connector is positioned facing forward.

8. the cover has a communication opening through which the cable connected to the connector passes, The work machine according to claim 7 , wherein the communication port is located forward of the connector when the cover is closed.

9. The work machine according to claim 8 , wherein the communication opening is located lower than the connector when the cover is closed.

10. The work machine according to claim 9 , wherein the communication port opens downward when the cover is closed.

11. The cover is a cover body disposed on the other side of the driving unit in the width direction; a protrusion formed by a part of the cover body protruding outward from the cover, The cover body has a curved shape in which the front side hangs down relative to the rear side in a closed state, The work machine according to claim 8 , wherein the protrusion is located at a lower front portion of the cover body when the cover body is closed, and has the communication port at a lower end thereof.

12. The connector includes a first connector and a second connector, the cables include a first cable connected to the first connector and a second cable connected to the second connector; the first connector and the second connector are arranged side by side in the machine room, the first connector has a cap that is rotatably supported, The cap is when connecting the first cable to the first connector, the connector is rotated to a position where it crosses the front of the second connector; The work machine according to claim 1 , wherein the work machine is rotated to a position where it crosses in front of the first connector when the second cable is connected to the second connector.

13. The work machine according to claim 12 , wherein the first connector and the second connector are arranged side by side in the width direction.

14. a charging stop switch disposed inside the machine room and configured to stop charging of the battery unit; The work machine according to claim 12 , wherein the charge stop switch is disposed on the other side in the width direction relative to the first connector and the second connector.

15. the first connector is a normal charging connector to which a normal charging cable serving as the first cable is connected, The work machine according to claim 12, wherein the second connector is a quick charge connector to which a quick charge cable serving as the second cable is connected.

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