Power-operated work vehicle

Abstract

To provide an electric work vehicle capable of alleviating labor for operating the electric work vehicle.SOLUTION: An electric work vehicle comprises: a battery 4; a motor that drives by a power supplied from the battery 4; a traveling device driven by the motor; and a connection part 47 connectable with a charger 60, being electrically connected with the battery 4. The connection part 47 has: a connection terminal part 50 connectable with the charger 60; and a housing 51 that covers the connection terminal part 50. A first drainage hole 61 is formed at a lower part of the housing 51.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an electric work vehicle equipped with a battery and a motor that is driven by power supplied from the battery. [Background technology]

[0002] An example of an electric work vehicle as described above is already known, for example, as described in Patent Document 1. This electric work vehicle travels using a traveling device (referred to as "front wheels" and "rear wheels" in Patent Document 1) that is driven by a motor (referred to as "electric motor" in Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-248918 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 does not disclose a connection section to which a charger for charging the battery can be connected. Here, it is conceivable that the electric work vehicle described in Patent Document 1 is provided with a connection section to which a charger can be connected and which is electrically connected to the battery, and the connection section has a connection terminal section to which the charger can be connected and a housing that covers the connection terminal section. With this configuration, the connection terminal section is protected by the housing.

[0005] However, it is possible that water may accumulate inside the housing, for example due to rainwater getting inside the housing. In that case, it is necessary to remove the water from inside the housing before connecting the charger. As a result, the labor required to operate the electric work vehicle tends to increase.

[0006] An object of the present invention is to provide an electric work vehicle that can reduce the labor required to operate the electric work vehicle. [Means for solving the problem]

[0007] The present invention is characterized in that the vehicle includes a battery, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a connection part to which a charger can be connected and which is electrically connected to the battery, the connection part having a connection terminal part to which the charger can be connected and a housing which covers the connection terminal part, and a first drain hole is formed in a lower part of the housing. and a plate-like member located below the housing, the plate-like member having a second drainage hole formed therein, the second drainage hole overlapping with the housing in a plan view. The point is...

[0008] According to this configuration, even if water gets inside the housing, the water is drained by gravity to the outside of the housing through the first drainage hole at the bottom of the housing. This makes it difficult for water to accumulate inside the housing. As a result, it is often unnecessary to remove water from inside the housing before connecting the charger. This reduces the effort required to operate the electric work vehicle.

[0009] Therefore, with this configuration, it is possible to realize an electric work vehicle that can reduce the labor required to operate the electric work vehicle.

[0010]

[0011] According to this configuration, the second drain hole is located directly below the housing. Therefore, the water that falls from the first drain hole of the housing Plate-shaped components The water does not accumulate on top of the container, but is easily drained through the second drain hole. Plate-shaped components This makes it easier to avoid water accumulating on top.

[0012] Furthermore, in the present invention, it is preferable that the vehicle is provided with a cooling device having a radiator and a cooling fan that cools the radiator, and that, in a planar view, the housing is positioned adjacent to the cooling device or overlapping with the cooling device.

[0013] According to this configuration, the water discharged from the first drainage hole of the housing is likely to fall near the cooling device. Therefore, the water is likely to evaporate due to the heat of the radiator and the wind of the cooling fan. Therefore, it is easy to prevent the water that falls from the first drainage hole of the housing from accumulating below the housing.

[0014] Furthermore, in the present invention, it is preferable that the housing has an opening for receiving the charger and is arranged in an orientation in which the opening faces diagonally upward, and that the first drainage hole is located below the lower end position of the opening.

[0015] With this configuration, water that has entered the housing from the opening can be more easily drained through the first drainage hole than when the first drainage hole is located above the lower end position of the opening. This makes it possible to realize an electric work vehicle in which water that has entered the housing from the opening that receives the charger can be more easily and reliably drained. [Brief description of the drawings]

[0016] [Figure 1] FIG. [Diagram 2] FIG. 4 is a left side view showing the arrangement of an inverter and the like. [Diagram 3] FIG. [Figure 4] FIG. 4 is a partially cutaway left side view showing the configuration of a connection portion and the like. [Diagram 5] FIG. 2 is a partially cutaway front view showing the configuration of a connection portion and the like. [Figure 6] FIG. 4 is a plan view showing the configuration of a second drainage hole and the like. [Figure 7] 10 is a partially cutaway front view showing the configuration of a connection portion and the like in a first alternative embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The 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 F in the drawing is "forward", the direction of the arrow B is "backward", the direction of the arrow L is "left", and the direction of the arrow R is "right". Also, the direction of the arrow U in the drawing is "upward", and the direction of the arrow D is "downward".

[0018] [Overall configuration of the tractor] The tractor of this embodiment will be described below. As shown in Fig. 1, the tractor has left and right front wheels 10, left and right rear wheels 11, and a cover member 12.

[0019] The tractor also includes a machine body frame 2 and a driving section 3. The machine body frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11.

[0020] The cover member 12 is disposed at the front of the vehicle body. The driver's section 3 is provided behind the cover member 12. In other words, the cover member 12 is disposed in front of the driver's section 3.

[0021] The driving section 3 has a protective frame 30, a driving seat 31, and a steering wheel 32. An operator can sit in the driving seat 31. This allows the operator to get into the driving section 3. The left and right front wheels 10 are steered by operating the steering wheel 32. The operator can perform various driving operations in the driving section 3.

[0022] The tractor is equipped with a traveling battery 4. The cover member 12 is configured to be swingable about an opening / closing axis Q that runs along the left-right direction of the vehicle body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in a closed state, the traveling battery 4 is covered by the cover member 12.

[0023] As shown in Fig. 2, the tractor includes an inverter 14 and a motor M. The driving battery 4 supplies power to the inverter 14. The inverter 14 converts DC power from the driving battery 4 into AC power and supplies it to the motor M. The motor M is then driven by the AC power supplied from the inverter 14.

[0024] 2 and 3, the tractor is equipped with a hydrostatic continuously variable transmission 15 and a transmission 16. As shown in Fig. 3, the hydrostatic continuously variable transmission 15 has a hydraulic pump 15a and a hydraulic motor 15b.

[0025] The hydraulic pump 15a is driven by rotational power from the motor M. When the hydraulic pump 15a is driven, the rotational power is output from the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is configured so that the speed of the rotational power is changed between the hydraulic pump 15a and the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is also configured so that the gear ratio can be changed steplessly.

[0026] The rotational power output from the hydraulic motor 15b is transmitted to the transmission 16. The rotational power transmitted to the transmission 16 is changed in speed by a gear-type speed change mechanism of the transmission 16, and distributed to the left and right front wheels 10 and the left and right rear wheels 11. In this way, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0027] 2 and 3, the tractor is equipped with a mid PTO shaft 17 and a rear PTO shaft 18. The rotational power output from the motor M is distributed to the hydraulic pump 15a, the mid PTO shaft 17, and the rear PTO shaft 18. This causes the mid PTO shaft 17 and the rear PTO shaft 18 to rotate.

[0028] If a working device is connected to the mid PTO shaft 17 or the rear PTO shaft 18, the working device is driven by the rotational power of the mid PTO shaft 17 or the rear PTO shaft 18. For example, as shown in Fig. 2, in this embodiment, a grass cutting device 19 is connected to the mid PTO shaft 17. The grass cutting device 19 is driven by the rotational power of the mid PTO shaft 17.

[0029] With the above-described configuration, the tractor of this embodiment is equipped with a driving battery 4, a motor M driven by power supplied from the driving battery 4, and left and right front wheels 10 and left and right rear wheels 11 driven by the motor M.

[0030] This tractor corresponds to the "electric work vehicle" according to the present invention. The driving battery 4 corresponds to the "battery" according to the present invention. The left and right front wheels 10 and the left and right rear wheels 11 each correspond to the "travel device" according to the present invention.

[0031] [Front fuselage configuration] 4 to 6, the tractor of this embodiment includes a cooling device 20, a reserve tank 21, an auxiliary battery 22, a voltage converter 23, and an oil cooler 24. When the cover member 12 is in a closed state, the cooling device 20, the reserve tank 21, the auxiliary battery 22, the voltage converter 23 (DC / DC converter), and the oil cooler 24 are covered by the cover member 12.

[0032] The cooling device 20 has a radiator 25 and a cooling fan 26. The radiator 25 and a water pump (not shown) are included in a cooling water path in the tractor. The water pump pumps the cooling water, causing the cooling water to circulate through the cooling water path. The cooling water is cooled by passing through the radiator 25. The reserve tank 21 can store the cooling water.

[0033] Cooling fan 26 is disposed behind radiator 25. Cooling fan 26 sends cooling air to the rear. As a result, outside air is introduced into the inside of cover member 12 via outside air inlet 12a provided in the front part of cover member 12, and passes through radiator 25. As a result, radiator 25 is cooled.

[0034] That is, the tractor of this embodiment is equipped with a cooling device 20 having a radiator 25 and a cooling fan 26 that cools the radiator 25.

[0035] The auxiliary battery 22 supplies electric power to various auxiliary devices. Electric power is also sent from the driving battery 4 to a voltage converter 23. The voltage converter 23 then steps down the electric power from the driving battery 4 and supplies it to the auxiliary battery 22.

[0036] The hydraulic oil in the tractor is cooled by passing through an oil cooler 24.

[0037] As shown in FIG. 4 and FIG. 6, the cooling device 20 is supported by a support frame 40. The support frame 40 is configured in a gate shape covering the left and right sides and the upper side of the radiator 25. More specifically, the support frame 40 has a left plate portion 41, an upper plate portion 42, and a right plate portion 43. The left plate portion 41 and the right plate portion 43 are both plate-shaped members in a vertical position. The left plate portion 41 is located to the left of the right plate portion 43. The upper plate portion 42 is a plate-shaped member in a horizontal position. The upper plate portion 42 is provided in a state spanning the upper end portion of the left plate portion 41 and the upper end portion of the right plate portion 43. The left plate portion 41 covers the left side portion of the radiator 25. The upper plate portion 42 covers the upper side portion of the radiator 25. The right plate portion 43 covers the right side portion of the radiator 25.

[0038] 6, voltage converter 23 is attached to right plate portion 43 from the right side. In this way, voltage converter 23 is supported by support frame 40.

[0039] 4 and 6, the support frame 40 is supported by a support member 45 located below the support frame 40. The support member 45 is a plate-shaped member in a horizontal position. The support member 45 is supported by the body frame 2.

[0040] [Configuration of the connection area] As shown in FIGS. 4 and 5, the tractor of this embodiment includes an input harness 46 and a connection portion 47.

[0041] In addition, an input unit 48 is provided on the front side of the driving battery 4. The connection unit 47 is provided in front of the driving battery 4, adjacent to the left end of the front end of the driving battery 4. The input harness 46 electrically connects the connection unit 47 and the input unit 48.

[0042] With this configuration, the connection portion 47 is electrically connected to the driving battery 4 via the input harness 46 and the input portion 48.

[0043] The connection part 47 is disposed on a lateral side of the fuselage so as to face the lateral side of the fuselage. More specifically, the connection part 47 is disposed on a left side of the fuselage so as to face the left side of the fuselage. More precisely, the connection part 47 faces the upper left of the fuselage.

[0044] 4 and 5, the connection unit 47 has a connection terminal unit 50 and a housing 51. The connection terminal unit 50 is electrically connected to the driving battery 4 via the input harness 46 and the input unit 48. A charger 60 provided in a charging facility or the like can be connected to the connection terminal unit 50. The standards of the charger 60 and the connection unit 47 are not particularly limited, and may be, for example, CHAdeMO.

[0045] By connecting the charger 60 to the connection terminal section 50, power is supplied to the driving battery 4 via the input harness 46 and the input section 48. In this way, the driving battery 4 is charged.

[0046] In this manner, the tractor of this embodiment is equipped with a connection portion 47 to which the charger 60 can be connected and which is electrically connected to the driving battery 4.

[0047] As shown in Fig. 4, when the cover member 12 is in the open state, the connection portion 47 does not overlap with the cover member 12 in a side view. That is, when the cover member 12 is in the open state, the connection portion 47 is exposed. When the cover member 12 is in the closed state, the connection portion 47 is covered by the cover member 12. In Fig. 4, the cover member 12 in the open state is shown by a virtual line. Also, the cover member 12 in the closed state is shown by a solid line.

[0048] 4 to 6, the housing 51 has a substantially cylindrical shape. The housing 51 is provided so as to surround the periphery of the connection terminal portion 50. As a result, the housing 51 covers the connection terminal portion 50.

[0049] That is, the connection portion 47 has a connection terminal portion 50 to which a charger 60 can be connected, and a housing 51 that covers the connection terminal portion 50 .

[0050] 4 and 5, the tractor of this embodiment includes a bent plate-like holding portion 52 and a support stay 53. The housing 51 is fixed to the holding portion 52 by a bolt in a state in which the housing 51 passes through an attachment opening 52a of the holding portion 52.

[0051] As shown in Fig. 4, the holding portion 52 is fixed to a support stay 53 by a bolt. The support stay 53 extends in the front-rear direction. A front end portion of the support stay 53 is fixed to the left plate portion 41 by a bolt. A rear end portion of the support stay 53 is fixed to the driving battery 4 by a bolt.

[0052] With the above-described configuration, the housing 51 is supported by the left plate portion 41 and the driving battery 4 via the holding portion 52 and the support stay 53. As a result, the housing 51 is supported by the support member 45 via the holding portion 52, the support stay 53, and the left plate portion 41. In addition, as shown in Figures 4 to 6, the support member 45 is located below the housing 51.

[0053] Thus, the tractor of this embodiment is provided with the support member 45 that is positioned below the housing 51 and supports the housing 51.

[0054] 6, in a plan view, the housing 51 is disposed at a position overlapping with the cooling fan 26 of the cooling device 20. However, the present invention is not limited to this, and in a plan view, the housing 51 may be disposed at a position adjacent to the cooling device 20 without overlapping with the cooling device 20.

[0055] Thus, the housing 51 is disposed adjacent to the cooling device 20 or overlapping with the cooling device 20 in a plan view.

[0056] 5, the housing 51 has an opening 51a for receiving the charger 60. The housing 51 is disposed in a position in which the opening 51a faces obliquely upward.

[0057] That is, the housing 51 has an opening 51a for receiving the charger 60, and is disposed in a position in which the opening 51a faces obliquely upward.

[0058] 4 and 5, an output unit 49 is provided on the front side of the driving battery 4. The output unit 49 is disposed adjacent to the left side of the input unit 48. The output unit 49 is electrically connected to the inverter 14 via an output harness 54.

[0059] Electric power from the driving battery 4 is supplied to the inverter 14 via an output unit 49 and an output harness 54 .

[0060] [First drainage hole and second drainage hole] 5, the housing 51 has a cylindrical portion 51b extending diagonally downward to the left. A first drainage hole 61 is formed in the lower portion of the housing 51. The first drainage hole 61 is located below the lower end position P1 of the opening 51a.

[0061] The first drainage hole 61 is a hole that extends from the inlet portion 61a to the outlet portion 61b. The inlet portion 61a is located at the lower end of the space in the housing 51 in which the charger 60 is received. The outlet portion 61b is located at the lower end of the cylindrical portion 51b. That is, a part of the first drainage hole 61 passes through the cylindrical portion 51b. Furthermore, the outlet portion 61b is located lower than the inlet portion 61a.

[0062] With this configuration, if water gets into the space in housing 51 that receives charger 60, the water flows by gravity from inlet 61a into first drain hole 61. Then, the water moves downward by gravity through first drain hole 61 and is discharged downward from outlet 61b.

[0063] 5 and 6, a second drainage hole 45a is formed in the support member 45. As shown in Fig. 6, in plan view, the second drainage hole 45a overlaps with the housing 51. In addition, in plan view, the second drainage hole 45a is located between the cooling device 20 and the oil cooler 24.

[0064] With this configuration, the water discharged downward from the outlet portion 61b falls onto the support member 45. The water that falls onto the support member 45 is likely to evaporate due to the heat of the radiator 25 and the wind of the cooling fan 26. Even if the water that falls onto the support member 45 does not evaporate, it is likely to be discharged downward from the second drainage hole 45a by gravity.

[0065] In addition, the tractor of this embodiment is configured so that there is no member directly below the second drainage hole 45a, so that the water discharged downward from the second drainage hole 45a falls onto the ground.

[0066] According to the configuration described above, even if water gets inside the housing 51, the water is drained by gravity to the outside of the housing 51 through the first drainage hole 61 at the bottom of the housing 51. This makes it difficult for water to accumulate inside the housing 51. As a result, it tends to become unnecessary to remove water from inside the housing 51 before connecting the charger 60. This reduces the labor required to operate the tractor.

[0067] Therefore, according to the configuration described above, a tractor can be realized that can reduce the labor required to operate the tractor.

[0068] [First Alternative Embodiment] In the above embodiment, the cylindrical portion 51b is provided. A part of the first drainage hole 61 passes through the cylindrical portion 51b.

[0069] However, the present invention is not limited thereto. The following describes the first embodiment of the present invention, focusing on the differences from the above embodiment. The configuration other than the parts described below is the same as the above embodiment. Also, the same reference numerals are used for the same configuration as the above embodiment.

[0070] As shown in Fig. 7, in the first alternative embodiment, a cylindrical portion 51b is not provided. And, instead of the first drainage hole 61, at least one of a third drainage hole 62, a fourth drainage hole 63, and a fifth drainage hole 64 is provided. In Fig. 7, the third drainage hole 62, the fourth drainage hole 63, and the fifth drainage hole 64 are shown by imaginary lines.

[0071] Furthermore, only one of the third drain hole 62, the fourth drain hole 63, and the fifth drain hole 64 may be provided, or only two of them may be provided, or all of them may be provided.

[0072] The third drain hole 62, the fourth drain hole 63, and the fifth drain hole 64 are all formed in the lower part of the housing 51, and are located below the lower end position P1 of the opening 51a. The third drain hole 62, the fourth drain hole 63, and the fifth drain hole 64 all correspond to the "first drain hole" according to the present invention.

[0073] The third drain hole 62 is located in the vicinity of the opening 51a in the lower part of the housing 51. The fourth drain hole 63 is located in the lower part of the housing 51 at a location that communicates with the lower end of the space in which the charger 60 is received. The fifth drain hole 64 is located below the fourth drain hole 63. When the fourth drain hole 63 and the fifth drain hole 64 are provided, water drained downward from the fourth drain hole 63 is further drained downward from the fifth drain hole 64.

[0074] Even in such a configuration, for example, if the housing 51 and the cooling device 20 are arranged so that the water discharged from the third drainage hole 62 or the fifth drainage hole 64 falls near the cooling device 20, the water that falls onto the support member 45 is likely to evaporate due to the heat of the radiator 25 or the wind of the cooling fan 26. Furthermore, if the second drainage hole 45a overlaps with the housing 51 in a plan view, the water that falls onto the support member 45 from the third drainage hole 62 or the fifth drainage hole 64 is likely to be discharged downward by gravity from the second drainage hole 45a even if it does not evaporate.

[0075] Other embodiments (1) The support member 45 does not necessarily have to have the second drainage hole 45a formed therein.

[0076] (2) The second drainage hole 45a does not have to overlap with the housing 51 in a plan view.

[0077] (3) In plan view, the housing 51 does not have to be disposed in a position adjacent to the cooling device 20 or in a position overlapping with the cooling device 20.

[0078] (4) The opening 51a does not have to face obliquely upward.

[0079] (5) The first drainage hole 61 may be located above the lower end position P1 of the opening 51a.

[0080] The configurations disclosed in the above-mentioned embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, unless a contradiction occurs. In addition, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these embodiments, and can be appropriately modified within the scope of the present invention. [Industrial Applicability]

[0081] The present invention can be used not only in tractors, but also in various electric work vehicles such as combine harvesters, rice transplanters, and construction machines. [Explanation of symbols]

[0082] 4. Driving battery (battery) 10 Front wheels (running gear) 11 Rear wheels (running gear) 20 Cooling device 25 Radiator 26 Cooling fan 45 Support member (Plate-shaped member) 45a 2nd drain hole 47 Connection 50 Connection terminal 51 Housing 51a aperture 60 charger 61 1st drainage hole 62 3rd drain hole (1st drain hole) 63 4th drain hole (1st drain hole) 64 5th drain hole (1st drain hole) Medium motor P1 Lower end position

Claims

1. A battery; a motor driven by power supplied from the battery; A traveling device driven by the motor; a connection portion to which a charger can be connected and which is electrically connected to the battery; the connection portion includes a connection terminal portion to which the charger can be connected and a housing that covers the connection terminal portion, A first drain hole is formed in the lower portion of the housing, a plate-shaped member located below the housing, A second drainage hole is formed in the plate-like member, In a plan view, the second drainage hole overlaps with the housing.

2. A cooling device having a radiator and a cooling fan for cooling the radiator, The electric work vehicle according to claim 1 , wherein the housing is disposed adjacent to the cooling device or overlapping with the cooling device in a plan view.

3. the housing has an opening for receiving the charger, and is disposed in a position in which the opening faces obliquely upward; The electric work vehicle according to claim 1 or 2, wherein the first drainage hole is located below a lower end position of the opening.

Images