Electric work vehicle

Abstract

To connect a conductive cable with an inverter securely in such a manner that electricity is conducted therebetween.SOLUTION: An electric work vehicle includes: a machine body; a travel device which causes the machine body to travel; an operation mechanism for transmitting power to a work device; a motor M which rotationally drives at least one of the travel device and the operation mechanism; a battery 4 which supplies electric power to the motor M; an inverter 14 which converts a direct current from the battery 4 into an alternating current and supplies the alternating current to the motor M; a first conductive cable 20 which conducts the direct current to the inverter 14; and a second conductive cable 21 which conducts the alternating current to the motor M. A first lock mechanism is provided in at least one of a first connector 14B of the inverter 14 and a connection port 20A of the first conductive cable 20. A second lock mechanism is provided in at least one of a second connector 14C of the inverter 14 and a connection port 21A of the second conductive cable 21.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an electric work vehicle. [Background technology]

[0002] For example, an inverter is provided in an electric work vehicle disclosed in Patent Document 1, and the inverter is configured to convert DC power from a battery into AC power and supply it to a motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-000957 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when power is supplied from a battery to a motor via an inverter, a large current flows through the motor. This causes a large current to flow through a conductive cable electrically connected between the battery and the inverter, and through a conductive cable electrically connected between the inverter and the motor. For this reason, these conductive cables need to be firmly connected to the inverter so that they do not fall off.

[0005] An object of the present invention is to provide an electric work vehicle that securely connects a conductive cable to an inverter. [Means for solving the problem]

[0006] The electric work vehicle of the present invention comprises a body and It has front and rear wheels, A traveling device that causes the machine body to travel; an axle unit supporting the front wheels;the inverter includes a first connector electrically connected to the first conductive cable, an inverter module which converts the DC current into the AC current, and a second connector electrically connected to the second conductive cable, the inverter having a first connector electrically connected to the first conductive cable, an inverter module which converts the DC current into the AC current, and a second connector electrically connected to the second conductive cable, the inverter having a first locking mechanism which maintains a connection between the first connector and the first conductive cable, and the second locking mechanism which maintains a connection between the second connector and the second conductive cable, and the inverter having a first connector electrically connected to the first conductive cable, the first connector having a first locking mechanism which maintains a connection between the first connector and the first conductive cable, and the second connector having a second locking mechanism which maintains a connection between the second connector and the second conductive cable, Each of the first connector and the second connector is located on the front wheel side between the front wheel and the rear wheel, and is located between the axle unit and the battery in the vertical direction of the vehicle body. It is characterized by:

[0007] According to the present invention, the connection port of the first conductive cable and the first connector are connection points between the inverter and the first conductive cable, and the connection port of the second conductive cable and the second connector are connection points between the inverter and the second conductive cable. Since the first locking mechanism or the second locking mechanism is provided at these connection points, the first conductive cable and the second conductive cable are firmly connected to the inverter so as not to fall off. This realizes an electric work vehicle that firmly connects the conductive cables to the inverter.

[0008] In the present invention, it is preferable that the first locking mechanism is provided on one of the first connector and the connection port of the first conductive cable, and includes a first pivot mechanism which pivots between an engagement position where it engages with the other of the first connector and the connection port of the first conductive cable and a non-engagement position where it does not engage with the other of the first connector and the connection port of the first conductive cable, and a first slide mechanism which slides between a holding position where it holds the first pivot mechanism at the engagement position and a non-holding position where it does not hold the first pivot mechanism at the engagement position, and the second locking mechanism is provided on one of the second connector and the connection port of the second conductive cable, and includes a second pivot mechanism which pivots between an engagement position where it engages with the other of the second connector and the connection port of the second conductive cable and a non-engagement position where it does not engage with the other of the second connector and the connection port of the second conductive cable, and a second slide mechanism which slides between a holding position where it holds the second pivot mechanism at the engagement position and a non-holding position where it does not hold the second pivot mechanism at the engagement position.

[0009] According to this configuration, each of the first and second rotation mechanisms is configured to engage the conductive cable (including the first and second conductive cables) with the connector of the inverter (including the first and second connectors). When each of the first and second rotation mechanisms is located at the engagement position, the engagement state between the conductive cable and the connector of the inverter is maintained. In addition, the first slide mechanism is configured to hold the engagement position of the first rotation mechanism, and the second slide mechanism is configured to hold the engagement position of the second rotation mechanism. As a result, each of the first and second lock mechanisms is configured to be doubly locked. This further prevents each of the first and second conductive cables from falling off from the inverter.

[0010] The present invention The electric work vehicle , the inverter includes a first connector electrically connected to the first conductive cable, an inverter module which converts the DC current into the AC current, and a second connector electrically connected to the second conductive cable, the inverter having a first connector electrically connected to the first conductive cable, an inverter module which converts the DC current into the AC current, and a second connector electrically connected to the second conductive cable, the inverter having a first locking mechanism which maintains a connection between the first connector and the first conductive cable, and at least one of the first connector and a connection port of the first conductive cable has a second locking mechanism which maintains a connection between the second connector and the second conductive cable,The inverter and the motor are arranged side by side along the front-rear direction of the airframe, the motor has a third connector connected to the second conductive cable, the second connector and the third connector are arranged to face each other and to be shifted left and right as viewed in the front-rear direction of the airframe, and the second connector is provided in a state in which it is inclined toward the side where the third connector is located with respect to the front-rear direction of the airframe. It is characterized by .

[0011] According to the present invention, the connection port of the first conductive cable and the first connector are the connection points between the inverter and the first conductive cable, and the connection port of the second conductive cable and the second connector are the connection points between the inverter and the second conductive cable. Since the first lock mechanism or the second lock mechanism is provided at these connection points, the first conductive cable and the second conductive cable are firmly connected to the inverter so as not to fall off. This configuration makes it easier to connect the second conductive cable to the inverter and the motor even if the second connector and the third connector are not precisely aligned. This makes it possible to realize an electric work vehicle in which the conductive cable is securely and electrically connected to the inverter.

[0012] In the present invention, it is preferable that the inverter has a first conductive portion having a plurality of bus bars for conducting the DC current from the first connector to the inverter module, a second conductive portion having a plurality of bus bars for conducting the AC current from the inverter module to the second connector, and a vibration-damping member for suppressing vibration of the plurality of bus bars in each of the first conductive portion and the second conductive portion.

[0013] For example, if resonance occurs in the busbars of the first conductive portion and the second conductive portion, the central region in the longitudinal direction of the busbar may vibrate more than the two end portions, which may cause the bolts to loosen. According to this configuration, the first conductive portion and the second conductive portion each include a vibration-proof member. Therefore, even if resonance occurs in the busbars of the first conductive portion and the second conductive portion, the busbars are prevented from vibrating more excessively.

[0014] In the present invention, it is preferable that the vibration-isolating member is made of an insulating material that is not electrically conductive.

[0015] With this configuration, the vibration-isolating members can be easily disposed on each of the first conductive portion and the second conductive portion.

[0016] In the present invention, it is preferable that the vibration-isolating member is formed with a plurality of grooves for holding the plurality of bus bars therebetween.

[0017] With this configuration, the multiple bus bars are firmly supported by the vibration-proof member, and vibration of the bus bars is suppressed.

[0018] In the present invention, it is preferable that the vibration-isolating member includes two rod-shaped bodies that sandwich the plurality of bus bars together.

[0019] With this configuration, the multiple bus bars are firmly supported by the two rod-shaped bodies, and vibration of the bus bars is suppressed. [Brief description of the drawings]

[0020] [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 cross-sectional view of the machine frame and shows wiring around the inverter. [Diagram 5] FIG. 4 is a cross-sectional view of the machine frame and shows wiring around the inverter. [Figure 6] 2 is a plan view showing the inside of an inverter and the periphery of the inverter; FIG. [Figure 7] FIG. 13 is a diagram showing a locking mechanism for wiring to an inverter. [Figure 8] FIG. 13 is a diagram showing a locking mechanism for wiring to an inverter. [Figure 9] FIG. 13 is a diagram showing a locking mechanism for wiring to an inverter. [Figure 10] 11A and 11B are views showing a vibration-isolating member for a first conductive part. [Figure 11] 13A and 13B are views showing a vibration-isolating member for a second conductive part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] 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".

[0022] [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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The mid PTO shaft 17 and the rear PTO shaft 18 correspond to the "operating mechanism" of the present invention. The grass cutting device 19 corresponds to the "working device" of the present invention. The left and right front wheels 10 and the left and right rear wheels 11 correspond to the "traveling device" of the present invention.

[0034] [Inverter and wiring around the inverter] The inverter 14 and peripheral wiring of this embodiment will be described with reference to Figures 4 to 6. The inverter 14 converts a direct current from the driving battery 4 into an alternating current and supplies it to the motor M.

[0035] As shown in Fig. 6, the inverter 14 includes a capacitor 41 and an inverter module 42. The capacitor 41 and the inverter module 42 are electrically connected. The inverter module 42 is a circuit body that converts a direct current from the driving battery 4 into an alternating current, and is, for example, an insulated gate bipolar transistor (IGBT). The capacitor 41 keeps the supply voltage to the inverter module 42 constant. The inverter 14 has a case 14A, and the capacitor 41 and the inverter module 42 are housed in the case 14A. The case 14A is made by die casting of aluminum.

[0036] The driving battery 4 and the inverter 14 are electrically connected by a power cable 20. A direct current flows through the power cable 20. As shown in Figures 4 and 6, the inverter 14 is provided with an input connector 14B, which protrudes forward beyond the front surface of the case 14A and is electrically connected to a connection port 20A of the power cable 20.

[0037] 4 and 5, the inverter 14 and the motor M are electrically connected by a power supply cable 21. Three-phase AC current flows through the power supply cable 21. In other words, the power supply cable 21 is electrically connected to each of the inverter 14 and the motor M, and conducts AC current to the motor M. The inverter 14 is provided with an output connector 14C, which protrudes downward from the bottom surface of the case 14A and is electrically connected to a connection port 21A of the power supply cable 21. The motor M has a power receiving connector 22, which is electrically connected to a connection port 21B of the power supply cable 21.

[0038] 6, the inverter 14 has a first conductive part 43 and a second conductive part 44. The first conductive part 43 has two bus bars 43A, 43B for conducting DC current from the input connector 14B to the capacitor 41. The second conductive part 44 has three bus bars 44A, 44B, 44C for conducting AC current from the inverter module 42 to the output connector 14C. Three-phase AC currents of U, V, and W are passed through each of the three bus bars 44A, 44B, 44C in the second conductive part 44. A clamp-type current sensor 47 is disposed at the center of the three bus bars 44A, 44B, 44C in the longitudinal direction.

[0039] Thus, the inverter 14 has the input connector 14B electrically connected to the power cable 20, the inverter module 42 that converts DC current to AC current, and the output connector 14C electrically connected to the power supply cable 21.

[0040] The input connector 14B corresponds to the "first connector" of the present invention. The output connector 14C corresponds to the "second connector" of the present invention. The power receiving connector 22 corresponds to the "third connector" of the present invention. The power cable 20 corresponds to the "first conductive cable" of the present invention. The power supply cable 21 corresponds to the "second conductive cable" of the present invention.

[0041] 4 and 5, the vehicle frame 2 has left and right front-rear frames 2A and a horizontal frame 2B. The left and right front-rear frames 2A extend along the front-rear direction of the vehicle, and the horizontal frame 2B connects the left and right front-rear frames 2A to each other. The horizontal frame 2B connects the left and right front-rear frames 2A at the lower parts of the left and right front-rear frames 2A, and extends in the front-rear direction across the area where the front end of the inverter 14 is located and the area where the front end of the motor M is located in a plan view.

[0042] An axle unit 10F is connected to the horizontal frame 2B and extends to the left and right of the vehicle body. Front wheels 10 are rotatably supported at both left and right ends of the axle unit 10F. A propeller shaft 26 is connected to the transmission 16 and the axle unit 10F and extends in the fore-and-aft direction of the vehicle body below the horizontal frame 2B.

[0043] The inverter 14 and the motor M are disposed adjacent to each other in the front-rear direction. In other words, the inverter 14 and the motor M are disposed side by side along the front-rear direction of the vehicle body. The motor M and the inverter 14 are supported by the left and right front-rear frames 2A side by side along the front-rear direction of the vehicle body and positioned between the left and right front-rear frames 2A. The inverter 14 is positioned in front of the motor M.

[0044] The output connector 14C and the power receiving connector 22 are arranged facing each other. The output connector 14C is provided in a state of being located in an area of ​​the case 14A opposite to the side where the motor M is located. The power supply cable 21 is located above the horizontal frame 2B and is housed in the space between the left and right front and rear frames 2A. In other words, the power supply cable 21 extends in the front and rear directions within the space surrounded by the left and right front and rear frames 2A, the horizontal frame 2B, and the bottom surface part of the case 14A. This prevents the output connector 14C and the power supply cable 21 from coming into contact with foreign objects, and also reduces the risk of the output connector 14C and the power supply cable 21 coming into contact with foreign objects and becoming disconnected.

[0045] 5, a line L11 indicating the center in the left-right direction between the connection port 21B and the power receiving connector 22 and a line L12 indicating the center in the left-right direction between the connection port 21A and the output connector 14C are misaligned to the left and right. In other words, the output connector 14C and the power receiving connector 22 are arranged to face each other and to be misaligned to the left and right when viewed in the front-rear direction of the aircraft. Therefore, the output connector 14C is provided in a state in which it is inclined toward the side where the power receiving connector 22 is located with respect to the front-rear direction of the aircraft.

[0046] 6, the three bus bars 44A, 44B, and 44C in the second conductive part 44 are arranged at equal or approximately equal intervals so as to be aligned on a line L13. The line L13 is inclined with respect to the lateral direction of the aircraft. This makes it possible to configure the output connector 14C to be inclined toward the side where the power receiving connector 22 is located.

[0047] The driving battery 4 is mounted and supported on the left and right front and rear frames 2A in a state where it is located directly above the inverter 14. Specifically, as shown in Figures 4 to 6, left and right support surface portions 23 are formed on the upper end portions of each of the left and right front and rear frames 2A. A mounting base frame 24 is mounted on the left and right support surface portions 23, and the driving battery 4 is mounted on the mounting base frame 24.

[0048] The left and right support surface portions 23 extend laterally of the aircraft at the upper end portions of the left and right front and rear frames 2A. As shown in Figs. 4 and 5, triangular ribs 27A, 27B, 27C, and 27D are interposed between the support surface portions 23 and the front and rear frames 2A so that the left and right support surface portions 23 do not bend relative to the left and right front and rear frames 2A, and the support surface portions 23 are reinforced by the triangular ribs 27A, 27B, 27C, and 27D. The bottom of the inverter 14 and the support surface portions 23 are connected by bolts. Thus, the inverter 14 is supported detachably on the left and right front and rear frames 2A.

[0049] The mounting table frame 24 is connected to the left and right support surface portions 23 with bolts. As shown in Figs. 4 to 6, the mounting table frame 24 is a member formed by welding together a vertical frame 24A made of C-shaped steel erected on the left and right support surface portions 23, left and right angle steels 24B extending in the front-rear direction of the machine body at the upper ends of the left and right vertical frames 24A, and a horizontal angle steel (not shown) connecting the left and right angle steels 24B extending in the front-rear direction of the machine body. The mounting table frame 24 is formed in a C-shape when viewed in the front-rear direction of the machine body. The mounting table frame 24 covers the inverter 14 from above and from the left and right sides.

[0050] Both left and right sides of the upper part of the angle steel 24B are bolted to the lower part of the connecting plate 25. Also, both left and right sides of the lower part of the driving battery 4 are bolted to the upper part of the connecting plate 25. In this way, the inverter 14 and the mounting frame 24 are connected via the connecting plate 25.

[0051] The driving battery 4 and the inverter 14 are disposed adjacent to each other in the vertical direction. In this manner, the output connector 14C is provided in a state where it protrudes from the surface of the case 14A on the side opposite to the side on which the driving battery 4 is located.

[0052] [Lock mechanism for wiring to inverter] In this embodiment, the connection port 20A of the power cable 20 and the connection port 21A of the power supply cable 21 are each provided with a rotating member 35 and a sliding member 36 as a locking mechanism. An arc-shaped long hole 35h is formed in the rotating member 35. A protruding locking portion 37 is inserted into the long hole 35h. The protruding locking portion 37 is formed in each of the input connector 14B and the output connector 14C of the inverter 14, and protrudes outward from the connector body.

[0053] The rotating member 35 and the sliding member 36 at the connection port 20A of the power cable 20 correspond to the "first locking mechanism" of the present invention, and the rotating member 35 and the sliding member 36 at the connection port 21A of the power supply cable 21 correspond to the "second locking mechanism" of the present invention. At the connection port 20A of the power cable 20, the rotating member 35 corresponds to the "first rotating mechanism" of the present invention, and the sliding member 36 corresponds to the "first sliding mechanism." At the connection port 21A of the power supply cable 21, the rotating member 35 corresponds to the "second rotating mechanism" of the present invention, and the sliding member 36 corresponds to the "second sliding mechanism."

[0054] As shown in Figures 7 and 8, the rotating member 35 is configured to be rotatable around the axis X. Figure 7 shows a state in which the connection port 20A is not engaged with the input connector 14B, or a state in which the connection port 21A is not engaged with the output connector 14C. The state of the rotating member 35 at this time is referred to as the "non-engagement position." With the rotating member 35 in the non-engagement position, the protruding locking portion 37 can be removed from the long hole 35h.

[0055] 8 shows a state in which the connection port 20A is engaged with the input connector 14B, or a state in which the connection port 21A is engaged with the output connector 14C. The state of the rotating member 35 at this time is referred to as the "engaged position." When an operator rotates the rotating member 35 in the direction of the arrow in FIG. 7, the rotating member 35 is switched from the non-engaged position to the engaged position.

[0056] One end of the long hole 35h is formed to be closer to the axis X than the other end of the long hole 35h. The long hole 35h is formed to be closer to the axis X as the one end is located. Therefore, when the rotating member 35 rotates toward the engagement position, the protruding locking portion 37 slides inside the long hole 35h toward the one end, and the connection port 20A and the input connector 14B (or the connection port 21A and the output connector 14C) approach each other and are firmly connected to each other.

[0057] When an operator rotates the rotating member 35 in the direction opposite to the arrow in Fig. 7, the rotating member 35 is switched from the engaged position to the disengaged position. At this time, when the rotating member 35 rotates toward the disengaged position, the protruding locking portion 37 slides inside the elongated hole 35h toward the other end, and the connection port 20A and the input connector 14B (or the connection port 21A and the output connector 14C) are separated. Then, when the protruding locking portion 37 comes out of the elongated hole 35h with the rotating member 35 in the disengaged position, the connection between the connection port 20A and the input connector 14B (or the connection port 21A and the output connector 14C) is released.

[0058] In this manner, the rotating member 35 is configured to rotate between an engagement position where it engages with the input connector 14B and a disengagement position where it does not engage with the input connector 14B.

[0059] The slide member 36 is configured to slide between a holding position where the rotating member 35 is held in the engaged position and a non-holding position where the rotating member 35 is not held in the engaged position. As shown in Fig. 9, when an operator slides the slide member 36 in the direction of the arrow shown in Fig. 9, the rotating member 35 and the slide member 36 engage with each other, and the rotating member 35 becomes unable to rotate while holding the engaged position. The position of the slide member 36 at this time is the holding position.

[0060] 9, the engagement between the rotating member 35 and the sliding member 36 is released, and the rotating member 35 becomes rotatable to the non-engaged position. The position of the sliding member 36 at this time is the non-retaining position.

[0061] [Vibration-proof structure of busbars in inverters] As described above, the inverter 14 has the first conductive part 43 and the second conductive part 44. The first conductive part 43 has two bus bars 43A and 43B for conducting DC current from the input connector 14B to the capacitor 41. The second conductive part 44 has three bus bars 44A, 44B, and 44C for conducting AC current from the inverter module 42 to the output connector 14C. Each of the bus bars 43A, 43B, 44A, 44B, and 44C is made of a long metal flat plate. Both ends of each of the bus bars 43A, 43B, 44A, 44B, and 44C in the longitudinal direction are fixed by bolts.

[0062] 6 and 10, the bus bars 43A, 43B of the first conductive part 43 are bolted to the input connector 14B and the terminals 41A, 41B of the capacitor 41, respectively. As shown in Fig. 6 and 11, the bus bars 44A, 44B, 44C of the second conductive part 44 are bolted to the output connector 14C and the inverter module 42, respectively.

[0063] Input connector 14B and output connector 14C each protrude outward beyond the outer surface of case 14A. Therefore, when vibration occurs, it is considered that the vibration of input connector 14B and output connector 14C each tends to be larger than the vibration of case 14A. In this case, the vibration of input connector 14B is transmitted to bus bars 43A and 43B, and the vibration of output connector 14C is transmitted to bus bars 44A, 44B, and 44C.

[0064] Each of the bus bars 43A, 43B, 44A, 44B, and 44C is made of a long metal flat plate. For this reason, if resonance occurs in each of the bus bars 43A, 43B, 44A, 44B, and 44C, for example, the central portion in the longitudinal direction of the metal plate may vibrate more than the bolted connection portions at both ends. This vibration may cause the bolts of the bolted connection portions to loosen. In order to avoid such a problem, in this embodiment, vibration-proof members 45 and 46 are provided as shown in Figs. 6, 11, and 12.

[0065] Vibration-isolating member 45 suppresses vibration of bus bars 43A, 43B in first conductive portion 43, and vibration-isolating member 46 suppresses vibration of bus bars 44A, 44B, 44C in second conductive portion 44. Each of vibration-isolating members 45, 46 is made of an insulator that is not conductive.

[0066] 11, two grooves 45i, 45j are formed in vibration-proof member 45. Groove 45i, 45j are formed to have a groove width corresponding to the thickness of busbars 43A, 43B, respectively, and are formed to be deeper than the width (length in the short direction) of busbars 43A, 43B. The central portion in the longitudinal direction of busbar 43A is inserted into groove 45i, and the central portion in the longitudinal direction of busbar 43B is inserted into groove 45j. Vibration-proof member 45 is fixed to case 14A with bolts.

[0067] Both longitudinal ends of busbars 43A and 43B are located outside grooves 45i and 45j. That is, both longitudinal ends of busbars 43A and 43B are connected to input connector 14B and terminals 41A and 41B, respectively, and central portions of busbars 43A and 43B in the longitudinal direction are clamped by vibration-proof members 45 in grooves 45i and 45j, respectively. This prevents the longitudinal central portions of busbars 43A and 43B from vibrating more than the longitudinal ends. As a result, the risk of loosening of bolts fastened to both longitudinal ends of busbars 43A and 43B is greatly reduced.

[0068] In this embodiment, as shown in Fig. 12, the vibration-proof member 46 is provided with two rod-shaped bodies 46A and 46B capable of clamping the bus bars 44A, 44B, and 44C together. The two rod-shaped bodies 46A and 46B clamp the central portions of the bus bars 44A, 44B, and 44C in the longitudinal direction in the central region of the bus bars. The two longitudinal ends of the two rod-shaped bodies 46A and 46B are connected by bolts. This prevents the central portions of the bus bars 44A, 44B, and 44C from vibrating more than the two end portions. As a result, the risk of the bolts fastened to the both end portions of the bus bars 44A, 44B, and 44C becoming loose is greatly reduced.

[0069] [Another embodiment] The present invention is not limited to the configurations exemplified in the above-described embodiments, and other representative embodiments of the present invention will be described below.

[0070] (1) In the above embodiment, the motor M drives and rotates both the traveling device and the actuation mechanism, but is not limited to this embodiment. The motor M may be configured to drive and rotate one of the traveling device and the actuation mechanism.

[0071] (2) In the above embodiment, the rotating member 35 and the sliding member 36 in the connection port 20A of the power cable 20 are provided as the first locking mechanism, but this is not limited to the embodiment. For example, the rotating member 35 and the sliding member 36 as the first locking mechanism may be provided in the input connector 14B. In other words, it is sufficient that at least one of the input connector 14B and the connection port 20A of the power cable 20 is provided with a first locking mechanism that maintains the connection between the input connector 14B and the power cable 20.

[0072] (3) In the above embodiment, the rotating member 35 and the sliding member 36 at the connection port 21A of the power supply cable 21 are provided as the second locking mechanism, but this is not limited to the embodiment. For example, the rotating member 35 and the sliding member 36 as the second locking mechanism may be provided at the output connector 14C. That is, it is sufficient that at least one of the output connector 14C and the connection port 21A of the power supply cable 21 is provided with a second locking mechanism that maintains the connection between the output connector 14C and the power supply cable 21.

[0073] (4) In the above embodiment, the inverter 14 and the motor M are arranged side by side in the front-rear direction, but this is not limited to the embodiment. For example, the inverter 14 and the motor M may be arranged side by side in the up-down direction, or the inverter 14 and the motor M may be arranged side by side in the left-right direction. Moreover, the inverter 14 and the motor M do not have to be adjacent to each other.

[0074] (5) In the above embodiment, the output connector 14C and the power receiving connector 22 are arranged with a left-right positional shift when viewed in the front-rear direction of the aircraft, but this is not limited to the embodiment. For example, the output connector 14C and the power receiving connector 22 may be arranged with a vertical positional shift when viewed in the front-rear direction of the aircraft. Also, the output connector 14C and the power receiving connector 22 may be configured not to be positioned with a positional shift when viewed in the front-rear direction of the aircraft.

[0075] (6) Two rod-shaped bodies 46A, 46B may be configured to sandwich bus bars 43A, 43B in first conductive part 43. In other words, vibration-proof member 46 may be provided with two rod-shaped bodies 46A, 46B that sandwich a plurality of bus bars together.

[0076] (7) Furthermore, vibration-proof member 45 may have grooves other than grooves 45i and 45j. And, three bus bars 44A, 44B, 44C of second conductive part 44 may be inserted into multiple grooves in vibration-proof member 45 and sandwiched by vibration-proof member 45. In other words, it is sufficient that vibration-proof member 45 has multiple grooves that sandwich multiple bus bars therebetween.

[0077] (8) In the above embodiment, the grass cutting device 19 is provided as the working device, but the working device is not limited to this embodiment. For example, the working device may be a cultivator, a seeding device, a planter, a fertilizer device, a leaf cutting device, a spraying device, a ridge forming device, a baler, a rotary rake, a tedder, or the like.

[0078] (9) In the above embodiment, an electric tractor is shown as the electric work vehicle, but the electric work vehicle is not limited to this embodiment. For example, the electric work vehicle may be an electric rice transplanter, an electric spreader, an electric sprayer, an electric combine harvester, an electric grass cutter, an electric wheel loader, an electric backhoe, etc.

[0079] 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]

[0080] The present invention can be applied to an electric work vehicle equipped with an inverter that converts direct current from a battery into alternating current and supplies the alternating current to a motor. [Explanation of symbols]

[0081] 4: Driving battery (battery) 10: Front wheels (running gear) 11: Rear wheels (running gear) 14: Inverter 14B: Input connector (first connector) 14C: Output connector (second connector) 17: Mid PTO shaft (operating mechanism) 18: Rear PTO shaft (operating mechanism) 19: Grass cutting equipment (work equipment) 20: Power cable (first conductive cable) 20A: Connection port 21: Power supply cable (second conductive cable) 21A: Connection port 22: Receiving connector (third connector) 35: Rotating member (first rotating mechanism, second rotating mechanism, first locking mechanism, second locking mechanism) ) 36: Slide member (first slide mechanism, second slide mechanism, first lock mechanism, first Two-lock mechanism) 42: Inverter module 43: First conductive part 43A: Busbar 43B: Busbar 44: Second conductive part 44A: Busbar 44B: Busbar 44C: Busbar 45: Vibration-proof material 45i:Groove 45j:Groove 46: Vibration-proof material 46A: Rod-shaped body 46B: Rod-shaped body M: Motor

Claims

1. The aircraft and A running device having front wheels and rear wheels for running the vehicle; an axle unit supporting the front wheels; an actuation mechanism for transmitting power to the working device; a motor that rotates and drives at least one of the traveling device and the actuation mechanism; a battery for supplying power to the motor; an inverter that converts a direct current from the battery into an alternating current and supplies the alternating current to the motor; a first conductive cable electrically connected to each of the battery and the inverter for conducting the DC current to the inverter; a second conductive cable electrically connected to each of the inverter and the motor for conducting the AC current to the motor; the inverter includes a first connector electrically connected to the first conductive cable, an inverter module configured to convert the DC current to the AC current, and a second connector electrically connected to the second conductive cable; a first lock mechanism for maintaining a connection between the first connector and the first conductive cable is provided on at least one of the first connector and the connection port of the first conductive cable; a second lock mechanism for maintaining a connection between the second connector and the second conductive cable is provided on at least one of the second connector and the connection port of the second conductive cable, An electric work vehicle in which the first connector and the second connector are each located on the front wheel side between the front wheels and the rear wheels, and are also located between the axle unit and the battery in the vertical direction of the body.

2. An airframe; A traveling device that causes the machine body to travel; an actuation mechanism for transmitting power to the working device; a motor that rotates and drives at least one of the traveling device and the actuation mechanism; a battery for supplying power to the motor; an inverter that converts a direct current from the battery into an alternating current and supplies the alternating current to the motor; a first conductive cable electrically connected to each of the battery and the inverter for conducting the DC current to the inverter; a second conductive cable electrically connected to each of the inverter and the motor for conducting the AC current to the motor; the inverter includes a first connector electrically connected to the first conductive cable, an inverter module configured to convert the DC current to the AC current, and a second connector electrically connected to the second conductive cable; a first lock mechanism for maintaining a connection between the first connector and the first conductive cable is provided on at least one of the first connector and the connection port of the first conductive cable; a second lock mechanism for maintaining a connection between the second connector and the second conductive cable is provided on at least one of the second connector and the connection port of the second conductive cable, The inverter and the motor are arranged side by side along a front-rear direction of the aircraft body, the motor has a third connector that connects to the second conductive cable; The second connector and the third connector are arranged to face each other and to be shifted left and right when viewed in the front-rear direction of the aircraft, An electric work vehicle in which the second connector is arranged in a state inclined toward the side where the third connector is located in the fore-and-aft direction of the vehicle body.

3. the first lock mechanism includes a first rotation mechanism that is provided on one of the first connector and the connection port of the first conductive cable and rotates between an engagement position where the first connector engages with the other of the first connector and the connection port of the first conductive cable and a non-engagement position where the first connector does not engage with the other of the first connector and the connection port of the first conductive cable, and a first slide mechanism that slides between a holding position where the first rotation mechanism is held at the engagement position and a non-holding position where the first rotation mechanism is not held at the engagement position, 3. The electric work vehicle according to claim 1 or 2, wherein the second locking mechanism comprises: a second pivot mechanism that is provided on one of the second connector and the connection port of the second conductive cable, and that pivots between an engagement position in which the second connector engages with the other of the second connector and the connection port of the second conductive cable and a non-engagement position in which the second connector does not engage with the other of the second connector and the connection port of the second conductive cable, and a second slide mechanism that slides between a holding position in which the second pivot mechanism is held in the engagement position and a non-holding position in which the second pivot mechanism is not held in the engagement position.

4. 4. The electric work vehicle according to any one of claims 1 to 3, wherein the inverter comprises: a first conductive section having a plurality of bus bars for conducting the DC current from the first connector to the inverter module; a second conductive section having a plurality of bus bars for conducting the AC current from the inverter module to the second connector; and a vibration-proof member for suppressing vibration of the plurality of bus bars in each of the first conductive section and the second conductive section.

5. 5. The electric work vehicle according to claim 4, wherein the vibration-isolating member is made of an insulating material that is not electrically conductive.

6. 6. The electric work vehicle according to claim 5, wherein the vibration-isolating member is formed with a plurality of grooves for holding the plurality of bus bars therebetween.

7. 7. The electric work vehicle according to claim 5, wherein the vibration-isolating member is provided with two rod-shaped bodies that clamp the plurality of bus bars together.

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