Electric work vehicle

Abstract

To provide an electric work vehicle that can be wirelessly charged with electricity, which is configured so that position adjustment between an electricity transmission unit and an electricity reception unit is performed smoothly.SOLUTION: An electric work vehicle is equipped with: a battery 27 supported on a vehicle body 3; an electric motor 29 for running which is supplied with electricity from the battery 27; an electricity reception unit 5 for wirelessly charging; and an electricity reception unit mounting base 6 that mounts the electricity reception unit 5 for wirelessly charging on the vehicle body 3. A displacement mechanism 60, which performs at least either of translational displacement or rotational displacement of the electricity reception unit 5 for wirelessly charging in order to adjust a charging position of the electricity reception unit 5 for wirelessly charging with respect to an electricity transmission unit 90 for wirelessly charging, is incorporated into the electricity reception unit mounting base 6.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an electric work vehicle that runs by an electric motor for traveling that is powered by a battery that is wirelessly charged. [Background technology]

[0002] In recent years, wireless charging (non-contact charging) has been proposed as an alternative to battery charging using a charging cable. In this case, a power transmitting unit incorporating a power transmitting coil is installed in a charging station or the like, and a power receiving unit incorporating a power receiving coil that interacts with the power transmitting coil is installed in a vehicle.

[0003] For example, Patent Document 1 discloses a power receiving unit to which power is supplied contactlessly from a power transmitting unit (primary coil) installed on the ground. A support member (coil support member) of this power receiving unit is fixed to a crossbar connecting a left frame and a right frame constituting the machine body, behind the rear axle case. The power transmitting unit is provided with a lifting mechanism for adjusting the height above the ground. Since the power receiving unit is fixed to the machine body, the position between the power transmitting unit and the power receiving unit in the transverse direction of the machine body is adjusted by moving the power transmitting unit, and the position in the fore-aft direction of the machine body is adjusted by moving the grass cutter forward and backward at a slow speed.

[0004] Patent Document 2 discloses an electric vehicle in which a power receiving unit (power receiving section) is arranged on the back surface of a hood that covers an electric motor, and this power receiving unit receives power contactlessly from a power supply section attached to an arm installed in charging equipment. Since this power receiving unit is also fixed to the hood, which is a vehicle component, the displacement of the arm of the power supply equipment is used to adjust the position between the power transmission unit and the power receiving unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-184360 A [Patent Document 2] JP 2019-062698 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the wireless charging systems of Patent Documents 1 and 2, the power receiving unit is fixed to a part of the vehicle body and cannot be displaced, which causes a problem that the position adjustment between the power transmitting unit and the power receiving unit cannot be performed smoothly.

[0007] In view of the above circumstances, an object of the present invention is to provide an electric work vehicle capable of wireless charging, in which the positional adjustment between a power transmitting unit and a power receiving unit can be smoothly performed. [Means for solving the problem]

[0008] The electric work vehicle according to the present invention comprises a vehicle body, a battery supported on the vehicle body, an electric motor for traveling powered by the battery, a wireless charging receiving unit, and a receiving unit mounting base for mounting the wireless charging receiving unit to the vehicle body, and the receiving unit mounting base incorporates a displacement mechanism that performs at least one of translational and rotational displacement of the wireless charging receiving unit to adjust the charging position of the wireless charging receiving unit relative to a wireless charging transmitting unit.

[0009] According to this configuration, a mounting base (mount) for attaching the wireless charging power receiving unit to the vehicle body incorporates a displacement mechanism that performs at least one of translational and rotational displacement of the wireless charging power receiving unit, so that the wireless charging power receiving unit can be displaced relative to the vehicle body. When the driver moves the vehicle body so that the wireless charging power receiving unit is positioned near a wireless power transmission receiving unit installed at a charging station or the like, the wireless charging power receiving unit and the wireless power transmission receiving unit are then smoothly adjusted to an appropriate positional relationship by the displacement of the wireless charging power receiving unit using the displacement mechanism.

[0010] In a preferred embodiment of the present invention, the displacement of the displacement mechanism includes a position adjustment displacement between the wireless charging power receiving unit and the wireless charging power transmitting unit, and a posture change displacement for changing the posture of the wireless charging power receiving unit between a charging posture and a non-charging posture. In this configuration, not only is it possible to adjust the position (fine adjustment) between the wireless charging power receiving unit and the wireless charging power transmitting unit, but it is also possible to change the posture of the wireless charging power receiving unit. By this posture change displacement, when not charging, the wireless charging power receiving unit can be held in a posture that does not interfere with other in-vehicle members or obstacles around the vehicle body.

[0011] The displacement of the wireless charging power receiving unit using the displacement mechanism can be performed by an artificial mechanical operation. However, when position adjustment is performed using electronic control technology that operates a moving device such as a motor or a cylinder, the position adjustment between the wireless charging power transmitting unit and the wireless charging power receiving unit can be performed more smoothly and easily. For this reason, in a preferred embodiment of the present invention, a displacement control unit is provided that controls the displacement of the displacement mechanism, and the displacement control unit has a first displacement control mode for the position adjustment displacement and a second displacement control mode for the attitude change displacement. When a configuration is adopted in which the charging position adjustment is automatically controlled based on the position deviation amount between the wireless charging power transmitting unit and the wireless charging power receiving unit in the first displacement control mode, the position adjustment between the wireless charging power transmitting unit and the wireless charging power receiving unit becomes smoother and more accurate. At that time, the position deviation amount is calculated based on a detection signal from a position detection sensor or the like.

[0012] The location of the power receiving unit mounting base on the vehicle body, and consequently the location of the wireless charging power receiving unit on the vehicle body, should be a location that ensures sufficient space for charging and is unlikely to interfere with surrounding obstacles while the electric work vehicle is traveling. In a preferred embodiment of the present invention, the following locations are proposed as suitable mounting locations: (1) "The power receiving unit mounting base is provided on the transmission case." The transmission case is provided in the lower region of the vehicle body and has a low ground clearance. Therefore, when the power transmission unit for wireless charging is installed on the ground, the receiving unit for wireless charging can be easily positioned above the power transmission unit for charging by moving the electric work vehicle. (2) "The mounting base for the receiving unit is provided inside at least the cover body that covers the battery from above." When the power transmission unit for charging is installed on the ground, depending on the shape of the power transmission unit for charging, it may interfere with the running of the vehicle to be charged. Therefore, as exemplified in Patent Document 2, there is also a power transmission unit for charging located near the bonnet of the vehicle. The mounting base for the receiving unit provided inside a cover body such as a bonnet is optimal for such a charging station, and the receiving unit for wireless charging does not give a sense of incongruity to the appearance of the vehicle. In addition, if the cover body is made of metal and causes heat generation or a decrease in the passing power due to the generation of an electromagnetic field, the charging efficiency decreases. Therefore, it is proposed that measures such as partially making the portion adjacent to the mounting base for the receiving unit of the cover body made of resin be taken. (3) "The mounting base for the receiving unit is provided on the protective frame erected on the vehicle body." In tractors and lawn mowers, for driver protection, a protective frame that is higher than the driver above the ground is provided. The receiving unit for wireless charging provided at a location other than the base of the protective frame has the advantage that it is almost impossible to interfere with other in-vehicle members. Therefore, when the power transmission unit for charging is located above the protective frame, it is preferable that the mounting base for the receiving unit be provided near the zenith of the protective frame. However, if the protective frame bends in the middle of its height, the mounting base for the receiving unit may be provided near the bending portion. (4) "The mounting base for the receiving unit is provided on the ceiling of the cabin that covers the driving area." Instead of the protective frame, when a cabin is equipped, the ceiling of the cabin is substantially a free space and has a low possibility of interfering with surrounding obstacles. Therefore, it is convenient to provide the mounting base for the receiving unit on the ceiling of the cabin.

Brief Description of the Drawings

[0013] [Figure 1] FIG. [Diagram 2] 11 is a schematic diagram showing an embodiment in which a power receiving unit mounting base is provided on a transmission case. FIG. [Diagram 3] 13 is a schematic diagram showing an embodiment in which a power receiving unit mounting base is provided inside a cover body. FIG. [Figure 4] 13 is a schematic diagram showing an embodiment in which a power receiving unit mounting base is provided on a protective frame. FIG. [Diagram 5] 11 is a schematic diagram showing an embodiment in which a power receiving unit mounting base is provided on a ceiling of a cabin. FIG. [Figure 6] 13 is a schematic diagram showing a displacement mechanism capable of changing the position of the wireless charging power receiving unit between a charging position and a non-charging position. FIG. [Figure 7] FIG. 2 is a control function block diagram showing a control function unit that performs charging control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of the arrow U in Fig. 1 is defined as "up", the direction of the arrow D is defined as "down", the direction of the arrow F is defined as "front", and the direction of the arrow B is defined as "rear". The direction perpendicular to the arrows U and F, that is, the vertical direction to the paper surface of Fig. 1, is defined as the "left-right direction".

[0015] One embodiment of an electric work vehicle (hereinafter simply referred to as a work vehicle) will be described with reference to FIG. 1. In this embodiment, the work vehicle is an electric tractor. Right and left front wheels 1 and right and left rear wheels 2 are attached to a body 3 formed of a frame structure. A power area 4A covered by a cover body 40, which is a bonnet, is disposed at the front part of the body 3 in the longitudinal direction of the body. A driving area 4B is disposed at the rear part of the body 3 in the longitudinal direction of the body. An arch-shaped protective frame 9 is erected at the rear end part of the body 3 in the longitudinal direction of the body.

[0016] A lifting / lowering link mechanism 14 is provided at the rear end in the vehicle body fore-and-aft direction of the vehicle body 3. Various working implements (not shown) such as cultivators can be attached to the lifting / lowering link mechanism 14. The working implements are raised and lowered by swinging the lifting / lowering link mechanism 14 up and down.

[0017] As shown in Fig. 3, a battery 27, an inverter 28, a traveling electric motor 29, and a cooling fan 32 are arranged in the power area 4A. A subframe structure 30 that creates a rectangular space is supported by the front and rear frames above the pair of left and right front and rear frames that make up the vehicle body 3. The battery 27 is arranged in the space created by the subframe structure 30 and is fixed to the subframe structure 30.

[0018] As shown in FIG. 1, the driving area 4B is provided with a steering wheel 15 for steering the front wheels 1 and a driver's seat 7. The steering wheel 15 is supported by a handle post (not shown). The handle post is covered with a panel 42 disposed on the lower front side of the steering wheel 15. This panel 42 is located in front of the driver's seat 7. The panel 42 extends to a floor panel 43 that forms the floor surface of the driving area 4B. The upper part of the panel 42 is formed as a meter panel, on which a speedometer and a fuel gauge are disposed. Furthermore, a group of operating tools 10 consisting of a plurality of manual operating tools for performing various operations on the work vehicle is disposed around the driver's seat 7.

[0019] As shown in Fig. 2, a transmission 12 having a continuously variable transmission 11 is attached to the rear portion of the vehicle body 3 below the driver's seat 7. The rear wheels 2 are supported by a transmission case 13 that houses the transmission 12. Power of a traveling electric motor 29 is transmitted to the continuously variable transmission 11 via a transmission shaft. The continuously variable transmission 11 is configured as a hydrostatic transmission (HST) and is capable of continuously changing speeds between the forward and reverse sides.

[0020] The power changed in speed by the continuously variable transmission 11 is transmitted to the rear wheels 2 via an auxiliary transmission (not shown) and a rear wheel differential (not shown) provided inside the transmission 12. The power branched off just before the rear wheel differential is transmitted to a front wheel differential (not shown) via a transmission shaft, and then transmitted from the front wheel differential to the front wheels 1.

[0021] As shown in Fig. 1, a mid-mounted mower deck 24, which is disposed between the front wheels 1 and the rear wheels 2, is attached to the vehicle body 3 so as to be movable up and down. The mower deck 24 has three rotating blades (not shown) which are driven to rotate around an axis extending in the up-down direction and are arranged inside the mower deck 24 so as to be aligned in the left-right direction, and grass cut by the rotating blades is discharged laterally to the right from a discharge section (not shown) on the right side of the mower deck 24.

[0022] This work vehicle is equipped with a wireless charging system for charging the battery 27. This wireless charging system includes a wireless charging power transmitting unit 90 installed in a charging station or a parking lot, and a wireless charging power receiving unit 5 equipped on the work vehicle. The wireless charging power transmitting unit 90 has a power transmitting coil, and the wireless charging power receiving unit 5 has a power receiving coil. As shown in Figs. 2 to 5, the wireless charging power receiving unit 5 can be equipped on the work vehicle in various embodiments described below. The power receiving unit 5 is attached to the vehicle body 3 using a power receiving unit mounting base 6. Hereinafter, the wireless charging power transmitting unit 90 will be simply referred to as the power transmitting unit 90, and the wireless charging power receiving unit 5 will be simply referred to as the power receiving unit 5.

[0023] (First embodiment) As shown in FIG. 2, in this embodiment, the power receiving unit 5 is attached to the power receiving unit mounting base 6 provided on the lower surface of the transmission case 13 via a displacement mechanism 60. The displacement mechanism 60 translates the power receiving unit 5. The translational displacement here is a three-dimensional translational displacement, which is a displacement in the vehicle body longitudinal direction, a displacement in the vehicle body transverse direction, and a displacement in the height direction above the ground. The power transmitting unit 90 is installed on the ground and is supplied with power from a charging device (not shown) via a power cable. After the work vehicle moves so that the center of the power receiving coil of the power receiving unit 5 is approximately located at the center of the power transmitting coil of the power transmitting unit 90, the displacement mechanism 60 is used to displace the power receiving coil of the power receiving unit 5 so that the center of the power receiving coil coincides with the center of the power transmitting coil of the power transmitting unit 90 and reaches an appropriate mutual distance. In FIG. 2, the power transmitting unit 90 protrudes from the ground, but may be buried in the ground. Furthermore, if the power transmitting unit 90 has a lifting function for adjusting the height above ground of the power transmitting coil of the power transmitting unit 90, the function of displacing the power receiving unit in the height direction above ground in the displacement mechanism 60 of the power receiving unit mounting base 6 is omitted.

[0024] Second embodiment As shown in FIG. 3, in this embodiment, the power receiving unit 5 is attached to a power receiving unit mounting base 6 provided on a bracket 41 fixed to the inside of a cover body 40 that covers the battery 27 from above, via a displacement mechanism 60. The displacement mechanism 60 displaces the power receiving unit 5 in the vehicle body longitudinal direction and the vehicle body transverse direction. The power transmitting unit 90 is configured to be movable up and down relative to the power receiving unit 5, and when the work vehicle moves so that the center of the power receiving coil of the power receiving unit 5 is approximately located at the center of the power transmitting coil of the power transmitting unit 90, the power transmitting unit 90 descends. Thereafter, the displacement mechanism 60 is used to perform displacement so that the center of the power receiving coil of the power receiving unit 5 coincides with the center of the power transmitting coil of the power transmitting unit 90. Note that if the cover body 40 is made of metal that reduces charging efficiency, a part of the cover body 40 located between the power transmitting unit 90 and the power receiving unit 5 during charging may be made of resin. Also, although not shown in the figure, a configuration may be adopted in which the bracket 41 is fixed to the upper part of the subframe structure 30, the cover body 40 is opened to expose the power receiving unit 5, and the power transmitting unit 90 is lowered toward the exposed power receiving unit 5.

[0025] Third embodiment As shown in FIG. 4, in this embodiment, the power receiving unit 5 is attached to a power receiving unit mounting base 6 provided on the top 9a of the protective frame 9 via a displacement mechanism 60. The displacement mechanism 60 displaces the power receiving unit 5 in the vehicle body longitudinal direction and the vehicle body transverse direction. The power transmitting unit 90 is configured to be movable up and down relative to the power receiving unit 5, and when the work vehicle moves so that the center of the power receiving coil of the power receiving unit 5 is approximately located at the center of the power transmitting coil of the power transmitting unit 90, the power transmitting unit 90 descends. Thereafter, the displacement is performed using the displacement mechanism 60 so that the center of the power receiving coil of the power receiving unit 5 coincides with the center of the power transmitting coil of the power transmitting unit 90. Note that this protective frame 9 is configured such that, when parking, the top 9a is folded down by a folding mechanism 9A at a midpoint in the height direction to the height level of the folding mechanism 9A or to a height level lower than that. For this reason, although not shown in the drawings, the power receiving unit mounting base 6 may be provided at an appropriate location on the folding mechanism 9A or the protective frame 9 therearound so that the power receiving unit 5 (power receiving coil) faces upward when folded.

[0026] (Fourth embodiment) As shown in FIG. 5, in this embodiment, a cabin 70 covering the driving area 4B is mounted on the vehicle body 3. The power receiving unit 5 is attached to a power receiving unit mounting base 6 provided on a ceiling portion 71 of the cabin 70 via a displacement mechanism 60. The displacement mechanism 60 displaces the power receiving unit 5 in the vehicle body longitudinal direction and the vehicle body transverse direction. The power transmitting unit 90 is configured to be movable up and down relative to the power receiving unit 5, and when the work vehicle moves so that the center of the power receiving coil of the power receiving unit 5 is approximately located at the center of the power transmitting coil of the power transmitting unit 90, the power transmitting unit 90 descends. Thereafter, the displacement mechanism 60 is used to perform displacement so that the center of the power receiving coil of the power receiving unit 5 coincides with the center of the power transmitting coil of the power transmitting unit 90. Although not shown in the figure, if the material of the ceiling portion 71 of the cabin 70 allows wireless charging, the power receiving unit 5 can also be disposed on the inner surface of the ceiling portion 71 of the cabin 70.

[0027] In the second to fourth embodiments described above, the displacements used for adjusting the charging position of the power receiving unit 5 by the displacement mechanism 60 are the displacement in the vehicle body longitudinal direction and the displacement in the vehicle body transverse direction, but a displacement in the height direction above the ground may be added. Furthermore, in all the embodiments, the displacement mechanism 60 may be provided with a rotational displacement function.

[0028] Furthermore, as shown in Fig. 6, the displacement mechanism 60 has a posture change displacement function for changing the posture of the power receiving unit 5 between a charging posture and a non-charging posture. Here, the charging posture is a posture in which the center line of the power receiving coil of the power receiving unit 5 and the center line of the power transmitting coil of the power transmitting unit 90 are substantially in the same direction, and the non-charging posture is a posture in which charging is impossible but in which the power receiving unit 5 is less likely to interfere with obstacles while traveling. Fig. 6 shows a schematic example of a posture change by rotational displacement, but translational displacement or a combination of translational displacement and rotational displacement may also be used.

[0029] 7 is a control function block diagram showing a control function unit that mainly operates when charging the battery 27. The control function units include a charge control unit 50, a position detection sensor 81, a deviation amount detection unit 82, a notification unit 83, a displacement control unit 80, and a travel control unit 85.

[0030] The movement of the work vehicle to roughly bring the power receiving unit 5 closer to the power transmitting unit 90 is achieved by controlling the inverter 28 by the driving control unit 85 which responds to the operation of the driving operating tools included in the operating tool group 10, similar to normal driving.

[0031] Charging of the battery 27 is managed by a charging control unit 50 that responds to the operation of a charging operation tool included in the operation tool group 10. The deviation amount detection unit 82 detects the amount of position deviation between the power receiving coil of the power receiving unit 5 and the power transmitting coil of the power transmitting unit 90 based on a signal from a position detection sensor 81. The position detection sensor 81 can be composed of, for example, a sensor that detects electromagnetism from the power transmitting coil provided in the power receiving unit 5, but may also be composed of an optical sensor that detects a characteristic point of the power transmitting unit 90.

[0032] The displacement control unit 80 automatically controls the displacement of the power receiving unit 5 by the displacement mechanism 60 based on the detected positional deviation amount, and keeps the positional deviation amount between the power receiving coil and the power transmitting coil within an allowable range. The displacement control unit 80 has a first displacement control mode for displacement for adjusting the position between the power receiving coil and the power transmitting coil, and a second displacement control mode for displacement for changing the attitude described with reference to FIG.

[0033] The displacement control unit 80 can also control the displacement of the power receiving unit 5 through manual operation using a charging operation tool. In this case, it is convenient to notify the operator of the positional displacement detected by the displacement amount detection unit 82 through the notification unit 83. Notification forms include directional lamp display, audio display, text display, and the like.

[0034] When the amount of positional misalignment between the power receiving coil and the power transmitting coil falls within an allowable range, the power transmitting unit 90 starts a charging operation under the control of a power transmitting control unit 91 provided in the charging station, and the battery 27 is charged.

[0035] As shown typically in Fig. 2 to Fig. 5, if both the power receiving unit 5 and the power transmitting unit 90 are configured to be capable of translational displacement, smoother position adjustment becomes possible. To achieve this, a displacement control unit that controls the displacement mechanism of the power transmitting unit 90 on the charging station side and a displacement control unit 80 of the power receiving unit 5 coordinate control to keep the positional deviation between the power receiving coil and the power transmitting coil within an allowable range. At this time, the control system of the charging station and the control system of the electric work vehicle are connected to each other via wire or wirelessly so as to be able to communicate data. Of course, the wireless charging power receiving unit 5 and the wireless charging power transmitting unit 90 may also be configured to be capable of rotational displacement.

[0036] [Another embodiment] (1) In the above embodiment, the power receiving unit mounting base 6 is provided at four locations on the work vehicle, but in the present invention, the mounting location of the power receiving unit mounting base 6 is not limited to these locations. For example, it may be provided on the front axle case where the front wheels 1 are supported, the front end of the vehicle body 3, or the like.

[0037] (2) In the above embodiment, the battery 27 is disposed at the front of the vehicle body 3. However, the battery 27 may be disposed below the floor panel 43 or may be disposed separately.

[0038] (3) In the above-described embodiment, the power transmitting unit 90 is provided in a fixed location such as a charging station. However, the power transmitting unit 90 may be provided in a mobile charging vehicle, a charging drone, or the like.

[0039] (4) In the above embodiment, the configuration and method for charging the battery 27 mounted on the electric work vehicle have been described, but it is also possible to supply power to or charge other devices from the electric work vehicle. In this case, a power supply port provided at a location other than the power receiving unit 5 may be used, or the power receiving unit 5 may be used as a power transmitting unit. In other words, it is preferable to provide a control mode in which power is supplied from the electric work vehicle to the charging station, which is the opposite of the above embodiment. Such use is particularly effective when the charging station is installed at home. Since the power receiving unit 5 and the power transmitting unit 90 are easily aligned, power can be supplied at home with smooth alignment. When a power outage occurs at home due to a disaster or the like, power can be supplied to the home from the electric work vehicle via the charging station.

[0040] In addition, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, provided no contradiction arises. Furthermore, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0041] The present invention can be used in an electric work vehicle equipped with a wirelessly charged battery. [Explanation of symbols]

[0042] 4A: Power area 4B: Operation area 5: Receiving unit (receiving unit for wireless charging) 6: Power receiving unit mounting base 9: Protective frame 9A: Folding mechanism 9a:Top 10: Operating tools 13: Transmission case 27: Battery 29: Electric motor for driving 30: Subframe structure 40: Cover body 41: Bracket 50: Charging control unit 60: Displacement mechanism 70: Cabin 71: Ceiling 80: Displacement control section 81: Position detection sensor 82: Deviation amount detection unit 83: Information Department 85: Driving control unit 90: Power transmission unit (power transmission unit for wireless charging) 91: Power transmission control unit

Claims

1. The car body and A battery supported on the vehicle body; a driving electric motor supplied with power from the battery; A wireless charging receiving unit; a power receiving unit mounting base for mounting the wireless charging power receiving unit to the vehicle body; Equipped with An electric work vehicle in which a displacement mechanism is incorporated in the power receiving unit mounting base for performing at least one of translational and rotational displacement of the wireless charging power receiving unit in order to adjust the charging position of the wireless charging power receiving unit relative to the wireless charging power transmitting unit.

2. The electric work vehicle of claim 1, wherein the displacement of the displacement mechanism includes a position adjustment displacement between the wireless charging power receiving unit and the wireless charging power transmitting unit, and a posture change displacement that changes the posture of the wireless charging power receiving unit between a charging posture and a non-charging posture.

3. 3. The electric work vehicle according to claim 2, further comprising a displacement control unit that controls the displacement of the displacement mechanism, the displacement control unit having a first displacement control mode for the position adjustment displacement and a second displacement control mode for the attitude change displacement.

4. The electric work vehicle according to claim 3 , wherein, in the first displacement control mode, the adjustment of the charging position is automatically controlled based on an amount of positional deviation between the wireless charging power transmitting unit and the wireless charging power receiving unit.

5. 2. The electric work vehicle according to claim 1, wherein the power receiving unit mounting base is provided on a transmission case.

6. 2. The electric work vehicle according to claim 1, wherein the power receiving unit mounting base is provided inside a cover body that covers at least the battery from above.

7. 2. The electric work vehicle according to claim 1, wherein the power receiving unit mounting base is provided on a protective frame that is erected on the vehicle body.

8. 2. The electric work vehicle according to claim 1, wherein the power receiving unit mounting base is provided on a ceiling of a cabin which covers a driving area.

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