Work vehicles

Abstract

To provide a work vehicle having a single-phase power charger mounted as an on-vehicle charger and capable of supplying power through two types of external power sources including a three-phase power source and three types of power cables.SOLUTION: A work vehicle 1 comprises: a relay component 60 to which a power cable Ca for supplying power from an external power source PS is connected; and three single-phase power chargers 62A, 62B, and 62C arranged in parallel to supply power to an electric motor 18. As the relay component 60, corresponding one is selected from a first relay component 60A when the external power source PS is a three-phase power source and the power cable Ca has a 4-line output plug PgA including an earth line, a second relay component 60B when the external power source PS is a three-phase power source and the power cable Ca has a 5-line output plug PgB including an earth line, and a third relay component 60C when the external power source PS is a single-phase power source and the power cable Ca has a 3-line output plug PgC including an earth line, and is fitted to a vehicle body 3.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a work vehicle including a work device operated by hydraulic pressure and an electric motor serving as a drive source for the work device.

Background Art

[0002] As examples of work vehicles, a hydraulic excavator, a wheel loader, etc. are conventionally known, which include a lower body to which crawlers or tires for traveling are attached, an upper body disposed on the lower body, and a work device attached to the lower body or the upper body and operated by hydraulic pressure.

[0003] Recently, work vehicles driven by an electric motor instead of a conventional engine have been developed (see Patent Document 1: Japanese Patent No. 6463537).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] [[ID=Y]] In the work vehicle driven by the electric motor exemplified above, a method of connecting an external power cable to an in-vehicle charger mounted on the vehicle body and supplying power from an external power source is widely adopted.

[0006] Here, the external power supply and power cable used by users of work vehicles driven by electric motors come in several specifications. Specifically, there are at least three types of specifications: (1) when the external power supply is a three-phase AC power supply and the power cable has a four-wire output plug including a ground wire; (2) when the external power supply is a three-phase AC power supply and the power cable has a five-wire output plug including a ground wire; and (3) when the external power supply is a single-phase AC power supply and the power cable has a three-wire output plug including a ground wire. (Note that there are also voltage differences, such as 200V and 400V for three-phase AC power supplies and 100V and 200V for single-phase AC power supplies, but these can be handled by changing the voltage resistance of the wiring and equipment, so it is sufficient to consider the basic configuration corresponding to the three types (1) to (3) above).

[0007] If the external power supply differs between three-phase AC and single-phase AC, one possible solution is to equip the work vehicle with a dedicated on-board charger, i.e., either a charger for three-phase AC or a charger for single-phase AC. In this case, a problem may arise where a work vehicle equipped with a single-phase AC charger cannot be powered from an external three-phase AC power supply, and similarly, a work vehicle equipped with a three-phase AC charger cannot be powered from an external single-phase AC power supply. Furthermore, even if the power supply specifications are the same, a difference in the number of pins in the power cable may result in the inability to supply power.

[0008] On the other hand, as an alternative to address the power supply differences, one could consider equipping the work vehicle with a transformer, phase converter, etc., to convert the power supply. However, in that case, challenges such as increased vehicle structure complexity, higher vehicle costs, and increased assembly man-hours may arise. [Means for solving the problem]

[0009] The present invention has been made in view of the above circumstances, and aims to realize a work vehicle that can be powered by at least two types of external power sources, including a three-phase AC power source, and three types of power cables, by equipping only a single-phase AC power charger as an on-board charger, without installing a device that converts a three-phase AC power source to a single-phase AC power source.

[0010] The present invention solves the above problem by the following means.

[0011] The work vehicle according to this embodiment comprises a vehicle body, a running gear, a hydraulically operated work device, and an electric motor that serves as a power source for the running gear or the work device, and further comprises an on-board charger that supplies power to drive the electric motor, a connection part for connecting to an external power source, and a wiring part for connecting the connection part and the on-board charger, wherein multiple types of the connection part and the wiring part are prepared according to the specifications of the external power source, and the connection part, the wiring part, and the vehicle body are configured such that one of the multiple types can be selected and attached to the vehicle body, and the multiple types of the connection part are fixed to the vehicle body. Along with this, the selected wiring section is connected. The shape of the fixing part is the same for all of them.

[0012] Also, the above An external power cable is connected to supply power from an external power source. The connection part An inlet, and a means for connecting the inlet and the on-board charger. The aforementioned wiring sectionThe vehicle charger comprises an intermediate harness and a relay component, wherein three single-phase AC power chargers are arranged to form a parallel circuit, and the relay component includes a first 4-wire inlet to which an output plug including a ground wire is detachably connected when the external power supply is a three-phase AC power supply and the power cable has a 4-wire output plug, and a first intermediate harness that branches from the inlet into three wires with at least one of wiring branching and rearrangement, and each branched end is provided with one output terminal that outputs single-phase AC power, and a second 5-wire inlet to which an output plug including a ground wire is detachably connected when the external power supply is a three-phase AC power supply and the power cable has a 5-wire output plug, and a relay component that branches from the inlet The configuration is such that one of the following components is selected and mounted on the vehicle body: a second intermediate harness having a second intermediate harness that branches into three wires with at least one of wire branching and rearrangement and has one output terminal at each branched end that outputs single-phase AC power; a third intermediate harness having a three-wire inlet to which an output plug including a ground wire is detachably connected when the external power supply is single-phase AC power and the power cable has a three-wire output plug, and a third intermediate harness that branches into three wires from the inlet with at least one of wire branching and rearrangement and has one output terminal at each branched end that outputs single-phase AC power; and the three output terminals of the intermediate component are electrically connected to the input terminals of three corresponding on-board chargers. Preferred .

[0013] According to the above configuration, by equipping the vehicle with only a single-phase AC power charger as the on-board charger, it is possible to realize a work vehicle that can be powered by at least two types of external power sources, including three-phase AC power, and three types of power cables. In this case, there is no need to install transformers, phase converters, or other equipment to convert three-phase AC power to single-phase AC power, either inside or outside the vehicle. Therefore, the vehicle structure can be simplified and costs can be reduced. Furthermore, whether or not a battery supplying power to the electric motor is installed in the work vehicle, it is possible to operate the vehicle with the power cable connected to the on-board charger (so-called wired operation).

[0014] Furthermore, the system includes a control unit for controlling the power supply and a storage battery for supplying power to drive the electric motor, and it is preferable that the control unit performs both simultaneous or one at a time the control unit performs the control of supplying power from the onboard charger to the storage battery to charge the storage battery and the control of supplying power from the onboard charger to the electric motor to drive the electric motor.

[0015] Furthermore, it is preferable that the output terminals of the first relay component, the second relay component, and the third relay component are formed in the same shape.

[0016] Furthermore, it is preferable that the first relay component, the second relay component, and the third relay component have the same shape for the fixing portion that secures the first inlet to the vehicle body, the shape for the fixing portion that secures the second inlet to the vehicle body, and the shape for the fixing portion that secures the third inlet to the vehicle body. [Effects of the Invention]

[0017] According to the present invention, by equipping a vehicle with only a single-phase AC power charger as the on-board charger, without installing equipment to convert a three-phase AC power supply to a single-phase AC power supply, it is possible to realize a work vehicle that can be powered by at least two types of external power supplies, including a three-phase AC power supply, and three types of power cables. [Brief explanation of the drawing]

[0018] [Figure 1] FIG. 1 is a perspective view showing an example of a work vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the mounted state of the in-vehicle charger of the work vehicle shown in FIG. 1. [Figure 3] FIG. 3 is a perspective view showing an example of a relay component and an in-vehicle charger of the work vehicle shown in FIG. 1. [Figure 4] FIG. 4 is a schematic diagram for explaining the main configuration of the power supply circuit of the work vehicle shown in FIG. 1. [Figure 5] FIG. 5 is a diagram showing a part of the schematic diagram shown in FIG. 4 in detail. [Figure 6] FIG. 6 is a perspective view showing an example of a relay component of the work vehicle shown in FIG. 1. [Figure 7] FIG. 7 is a schematic diagram for explaining the configuration of the first relay component. [Figure 8] FIG. 8 is a schematic diagram for explaining the configuration of the second relay component. [Figure 9] FIG. 9 is a schematic diagram for explaining the configuration of the third relay component.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram (perspective view from the upper left rear) showing an example of a work vehicle 1 according to the present embodiment. For convenience of explanation, in the figure, the directions of up and down, left and right, and front and rear may be indicated by arrows. Also, in all the drawings for explaining the embodiments, members having the same function may be denoted by the same reference numerals, and repeated explanations thereof may be omitted.

[0020] First, the overall configuration of the work vehicle 1 will be described. The hydraulic excavator will be described as an example of the work vehicle 1. However, the work vehicle 1 is not limited to the hydraulic excavator.

[0021] As shown in Figure 1, the work vehicle 1 comprises a lower body 2 and an upper body 3 disposed on top of the lower body 2 (the lower body 2 and the upper body 3 may be a single integrated unit).

[0022] The work vehicle 1 is equipped with work devices 12 and 14 attached to the lower body 2 and upper body 3, which are operated by hydraulics (hydraulic fluid at a predetermined pressure). The lower body 2 is equipped with a travel device 10 for movement. The upper body 3 is equipped with a driver's cab 16 at the front, which is fitted with an operating device for the operator to ride in and operate the vehicle and perform work.

[0023] As an example of the running gear 10, it is equipped with a pair of crawlers (endless tracks) 26 on the left and right sides. However, the running gear 10 is not limited to crawlers 26. As another example, the work vehicle 1 may be configured to have tires instead of crawlers 26 (not shown). The crawlers 26 are driven (driven) by a hydraulic motor (not shown).

[0024] As an example of the work device 12, it is equipped with a dozer blade 24. The dozer blade 24 is mounted on the lower body 2 so as to be able to swing up and down (including the front and back components). The dozer blade 24 is driven by a hydraulic cylinder (dozer blade cylinder) 32. However, the work device 12 is not limited to the above configuration.

[0025] An example of the work device 14 includes a boom 42, an arm 44, and an attachment (a bucket in this embodiment) 46. However, the attachment 46 is not limited to a bucket. The boom 42 is attached to the upper body 3 so as to be able to swing up and down (including a front-to-back component). In this embodiment, a boom bracket (not shown) is provided between the upper body 3 and the boom 42. The boom bracket allows the boom 42 to swing left and right (including a front-to-back component) relative to the upper body 3. The boom bracket may be omitted. The arm 44 is attached to the boom 42 so as to be able to swing up and down (including a front-to-back component). The attachment 46 is attached to the arm 44 so as to be able to swing up and down (including a front-to-back component). The boom 42 is driven by a hydraulic cylinder (boom cylinder) 52. The arm 44 is driven by a hydraulic cylinder (arm cylinder) 54. The attachment 46 is driven by a hydraulic cylinder (bucket cylinder) 56. However, the work device 14 is not limited to the above configuration.

[0026] The drive mechanism for driving the above-mentioned hydraulic motor and each hydraulic cylinder consists, for example, of a hydraulic pump 20 driven by a drive source 18, a control valve, etc. By operating the control device, the operator activates the control valve, which controls the supply of hydraulic fluid at a predetermined pressure from the hydraulic pump 20 to the hydraulic motor and each hydraulic cylinder. This enables travel by the travel device 10 and work by the work devices 12 and 14. The hydraulic pump 20 constituting the drive mechanism is provided as one or more units depending on the configuration and load of the work devices 12 and 14 and the travel device 10.

[0027] In this embodiment, the work vehicle 1 is equipped with an electric motor as the drive source 18. The electric motor constituting the drive source 18 may consist of one or more motors, depending on the number of hydraulic pumps 20 and their rated output. As another example of the drive source 18, an engine may be used in combination with the electric motor (not shown).

[0028] Furthermore, the work vehicle 1 is equipped with an on-board charger 62 that supplies power to the electric motor 18. Figure 2 is a perspective view showing the on-board charger 62 mounted, with the cover and battery etc. hidden. Figure 3 is a perspective view showing the configuration of the on-board charger 62 and the relay component 60 described later.

[0029] Next, Figure 4 shows an example of the configuration of the main equipment constituting the power supply circuit of the work vehicle 1. An external power cable Ca, which receives power from an external power source PS, is detachably connected to a relay component 60 provided on the vehicle body (upper body 3 in this embodiment). Details of the configuration of the relay component 60 and the configuration of connecting the relay component 60 to the on-board charger 62 will be described later. Power output from the on-board charger 62 is supplied to the electric motor 18 via a battery pack 64 and an inverter 66. The battery pack 64 includes a first storage battery (e.g., a lithium-ion storage battery) 70 that stores the supplied power, a control unit 72 that controls the power supply to the electric motor 18 and the storage battery (first storage battery) 70, etc. A second storage battery (e.g., a lead-acid battery) 74 and various switches (controllers) 76 are connected to the battery pack 64.

[0030] The control unit 72 controls the supply of power from the onboard charger 62 to the storage battery (first storage battery) 70 to charge the storage battery (first storage battery) 70, and controls the supply of power from the onboard charger 62 to the electric motor 18 to drive the electric motor 18, either simultaneously or switching between them one at a time. In other words, with the power cable Ca connected to the relay component 60, the mode of charging the storage battery (first storage battery) 70 and the mode of driving the electric motor 18 can be performed either both at once or one at a time as appropriate.

[0031] As another example of a power supply circuit, it is also possible to configure the battery pack 64 without mounting a storage battery (first storage battery) 70, and instead operate with an external power cable Ca always connected (wired operation).

[0032] The other mechanisms for driving and working in the work vehicle 1 according to this embodiment are the same as those of known work vehicles (hydraulic excavators), so a detailed explanation will be omitted.

[0033] Next, we will describe the configuration of the relay component 60 and the details of the configuration connecting the relay component 60 and the on-board charger 62. Figure 5 shows a schematic diagram illustrating in detail an example of the configuration of the relay component 60 and the on-board charger 62.

[0034] In this embodiment, the on-board charger 62 consists of three single-phase AC power chargers 62A, 62B, and 62C arranged in a parallel circuit.

[0035] In this embodiment, one of the relay component 60 corresponding to the external power supply PS and power cable Ca is selected from the first relay component 60A, the second relay component 60B, and the third relay component 60C, and is attached to the vehicle body (upper body 3). Figure 6 shows a perspective view of the relay component 60 with the detachable cap 80a fitted.

[0036] The first relay component 60A has a configuration that corresponds to the case where the external power supply PS is a three-phase AC power supply and the power cable Ca has a four-wire output plug PgA including a ground wire. Specifically, the first relay component 60A has a four-wire inlet 80A (sometimes referred to as the "first inlet" in this application) to which the output plug PgA is detachably connected (see Figure 7). The first relay component 60A has an intermediate harness 82A (sometimes referred to as the "first intermediate harness" in this application) to which at least one of the wiring branching and rearrangement is performed from the inlet 80A to branch into three wires, and each branched end is provided with three-wire (or two-wire with the ground wire omitted) output terminals 84A, 84B, and 84C including a ground wire that outputs single-phase AC power. As an example, output terminals 84A, 84B, and 84C are formed to have the same shape.

[0037] The second relay component 60B has a configuration that corresponds to the case where the external power supply PS is a three-phase AC power supply and the power cable Ca has a five-wire output plug PgB including a ground wire. Specifically, the second relay component 60B has a five-wire inlet 80B (sometimes referred to as the "second inlet" in this application) to which the output plug PgB is detachably connected (see Figure 8). The second relay component 60B has an intermediate harness 82B (sometimes referred to as the "second intermediate harness" in this application) to which at least one of the wiring branching and rearrangement is performed from the inlet 80B to branch into three wires, and each branched end is provided with three-wire (or two-wire with the ground wire omitted) output terminals 84A, 84B, and 84C including a ground wire that outputs single-phase AC power. As an example, output terminals 84A, 84B, and 84C are formed to have the same shape.

[0038] The third relay component 60C has a configuration that corresponds to the case where the external power supply PS is a single-phase AC power supply and the power cable Ca has a three-wire output plug PgC including a ground wire. Specifically, the third relay component 60C has a three-wire inlet 80C (sometimes referred to as the "third inlet" in this application) to which the output plug PgC is detachably connected (see Figure 9). The third relay component 60C has an intermediate harness 82C (sometimes referred to as the "third intermediate harness" in this application) to which at least one of the wiring branching and rearrangement is performed from the inlet 80C to branch into three wires, and each branched end is provided with three-wire (or two-wire with the ground wire omitted) output terminals 84A, 84B, and 84C including a ground wire that outputs a single-phase AC power supply. As an example, output terminals 84A, 84B, and 84C are formed to have the same shape.

[0039] The above-mentioned relay component 60 is electrically connected to the on-board charger 62. Specifically, regardless of whether the relay component 60 is the first relay component 60A, the second relay component 60B, or the third relay component 60C, the output terminals 84A, 84B, and 84C provided at the ends of the intermediate harnesses 82A, 82B, and 82C are electrically connected to the input terminals 63A, 63B, and 63C of the three corresponding on-board chargers 62A, 62B, and 62C, respectively (they may be connected directly or via other wiring).

[0040] In this embodiment, the output terminals 84A of the intermediate harnesses 82A, 82B, and 82C are electrically connected to the input terminals 63A of the onboard charger 62A (configurations using 63B or 63C are also possible). The output terminals 84B of the intermediate harnesses 82A, 82B, and 82C are electrically connected to the input terminals 63B of the onboard charger 62B (configurations using 63C or 63A are also possible). The output terminals 84C of the intermediate harnesses 82A, 82B, and 82C are electrically connected to the input terminals 63C of the onboard charger 62C (configurations using 63A or 63B are also possible).

[0041] According to this embodiment, by equipping the vehicle charger 62 with only single-phase AC power chargers (in this embodiment, three single-phase AC power chargers 62A, 62B, and 62C), it is possible to supply power to the work vehicle 1 from at least two types of external power sources PS, including three-phase AC power, and three types of power cables Ca. In this case, there is no need to install transformers, phase converters, or other equipment to convert three-phase AC power to single-phase AC power, either in the vehicle or externally. Therefore, the vehicle structure can be simplified and costs can be reduced.

[0042] Furthermore, whether or not the battery that supplies power to the electric motor 18 (the first battery 70 mentioned above) is installed on the work vehicle 1, the system is configured to operate with the power cable Ca connected to the onboard charger 62 (wired operation).

[0043] Furthermore, in this embodiment, the output terminals 84A, 84B, and 84C of the first relay component 60A, the output terminals 84A, 84B, and 84C of the second relay component 60B, and the output terminals 84A, 84B, and 84C of the third relay component 60C are formed to have the same shape.

[0044] With this configuration, regardless of which of the first relay component 60A, second relay component 60B, or third relay component 60C is selected to correspond to the output plug (PgA, PgB, or PgC) of the external power cable Ca, the input terminals 63A, 63B, and 63C on the in-vehicle charger 62 (62A, 62B, 62C) to which the output terminals 84A, 84B, and 84C are connected can be made common. Therefore, since there is no need to prepare multiple types of input terminals, manufacturing costs can be reduced.

[0045] Furthermore, in this embodiment, the first relay component 60A, the second relay component 60B, and the third relay component 60C each have a fixing part 81 for fixing the inlet (first inlet) 80A to the vehicle body (upper body 3), a fixing part 81 for fixing the inlet (second inlet) 80B to the vehicle body (upper body 3), and an inlet (second 3 The fixing part 81 that secures the inlet 80C to the vehicle body (upper body 3) is formed to have the same shape.

[0046] With this configuration, regardless of which of the first relay component 60A, second relay component 60B, or third relay component 60C is selected to correspond to the output plug (PgA, PgB, or PgC) of the external power cable Ca, the base (not shown) provided on the vehicle body (upper body 3) for fixing the fixing part 81 can be standardized. Therefore, since there is no need to prepare multiple types of bases, manufacturing costs can be reduced.

[0047] As described above, according to the present invention, by equipping the vehicle with only a single-phase AC power charger (62A, 62B, 62C) as the on-board charger 62, without installing equipment (transformer, phase converter, etc.) to convert a three-phase AC power supply to a single-phase AC power supply, a work vehicle 1 can be realized that can be supplied with power from at least two types of external power supplies PS, including a three-phase AC power supply, and three types of power cables Ca.

[0048] Furthermore, the relay component 60 is not limited to the three types mentioned above; if the external power supply PS or power cable Ca has different specifications, a corresponding configuration should be prepared and selected.

[0049] In other words, the present invention can be expressed by the following broader concept. Specifically, the work vehicle 1 according to the present invention is a work vehicle comprising a vehicle body 2, 3, a running device 10, hydraulically operated work devices 12, 14, and an electric motor 18 that serves as a drive source for the running device 10 or the work devices 12, 14, and further comprising an onboard charger 62 that supplies power to drive the electric motor 18, a connection part that connects to an external power supply PS, and a wiring part that connects the connection part and the onboard charger 62, wherein multiple types of the connection part and the wiring part are prepared according to the specifications of the external power supply PS, and the connection part, the wiring part, and the vehicle body (upper body 3) are configured such that one of the multiple types can be selected and attached to the vehicle body (upper body 3). The connection section is exemplified by the inlets 80A, 80B, 80C, or the inlets 80A, 80B, 80C and the cables connected thereto (for example, power cable Ca or intermediate cable, etc.) in the above-described embodiment. The wiring section is exemplified by the intermediate harnesses 82A, 82B, 82C, or the intermediate harnesses 82A, 82B, 82C and the cables connected thereto (for example, intermediate cable, etc.) in the above-described embodiment.

[0050] The present invention is not limited to the above example (hydraulic excavator). The present invention can be similarly applied to other work vehicles (e.g., truck loaders, carriers, etc.). [Explanation of symbols]

[0051] 1. Work vehicles 10. Traveling device 12, 14 Working equipment 18. Power source (electric motor) 60, 60A, 60B, 60C relay components 62, 62A, 62B, 62C on-board charger 80A Inlet (First Inlet) 80B Inlet (Second Inlet) 80C Inlet (3rd Inlet) 82A Intermediate harness (1st intermediate harness) 82B Intermediate Harness (Second Intermediate Harness) 82C Intermediate Harness (Third Intermediate Harness) 84A, 84B, 84C output terminals Ca Power Cable PS external power supply PgA, PgB, PgC output plugs

Claims

1. A work vehicle comprising a vehicle body, a running gear, a hydraulically operated work device, and an electric motor that serves as a drive source for the running gear or the work device, An onboard charger that supplies power to drive the aforementioned electric motor, A connector for connecting to an external power supply, A wiring section connecting the aforementioned connection section and the on-board charger, Equipped with, Multiple types of connection parts and wiring parts are provided according to the specifications of the external power supply, and the connection parts, wiring parts, and the vehicle body are configured such that one of these multiple types can be selected and attached to the vehicle body. Multiple types of the aforementioned connection parts are fixed to the vehicle body, and the shape of the fixing part to which the selected wiring part is connected is the same for all of them. A work vehicle characterized by the following:

2. The relay component comprises an inlet that constitutes the connection part to which an external power cable supplying power from the external power source is connected, and an intermediate harness that constitutes the wiring part for connecting the inlet and the on-board charger, The aforementioned on-board charger consists of three single-phase AC power chargers arranged in a parallel circuit. As the aforementioned relay component, When the external power supply is a three-phase AC power supply and the power cable has a four-wire output plug including a ground wire, the first relay component has a four-wire first inlet to which the output plug is detachably connected, and a first intermediate harness that branches from the inlet into three wires with at least one of wiring branching and rearrangement, and each branched end is provided with one output terminal that outputs a single-phase AC power supply. When the external power supply is a three-phase AC power supply and the power cable has a five-wire output plug including a ground wire, the second relay component has a five-wire second inlet to which the output plug is detachably connected, and a second intermediate harness that branches from the inlet into three wires with at least one of wiring branching and rearrangement, and each branched end is provided with one output terminal that outputs single-phase AC power. When the external power supply is a single-phase AC power supply and the power cable has a three-wire output plug including a ground wire, the third relay component has a three-wire third inlet to which the output plug is detachably connected, and a third intermediate harness that branches from the inlet into three wires with at least one of wiring branching and rearrangement, and each branched end is provided with one output terminal that outputs a single-phase AC power supply. One of the corresponding items is selected and attached to the vehicle body. The three output terminals of the aforementioned relay component are each electrically connected to the corresponding input terminals of the three in-vehicle chargers. A work vehicle according to claim 1, characterized by the following:

3. A control unit that controls the power supply, The system includes a storage battery that supplies power to drive the electric motor, The control unit performs the following actions simultaneously or by switching between them: controlling the battery to charge by supplying power from the onboard charger, and controlling the electric motor to drive by supplying power from the onboard charger. A work vehicle according to claim 2, characterized by the following:

4. The first relay component, the second relay component, and the third relay component are formed with identical output terminal shapes. A work vehicle according to claim 2 or claim 3, characterized by the following:

5. The first relay component, the second relay component, and the third relay component are formed such that the shape of the fixing portion for fixing the first inlet to the vehicle body, the shape of the fixing portion for fixing the second inlet to the vehicle body, and the shape of the fixing portion for fixing the third inlet to the vehicle body are identical. A work vehicle according to claim 2 or claim 3, characterized by the following:

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