Work vehicles

Abstract

To provide an electric work vehicle which can suppress an influence etc. of vibration on an electric component to prevent damage of the electric component.SOLUTION: In a work vehicle, a pair of left and right front wheels 2 is provided at a front part of a travelling vehicle body, a pair of left and right rear wheels 3 is provided at a rear part of the travelling vehicle body, and a work machine 4 is attached to the travelling vehicle body. A hood part formed with a predetermined space is provided at the front side of the travelling vehicle body. A control part on which an operator gets is provided rearward of the hood part. An electric motor 30 for driving the rear wheels 3 is provided below and rearward of a driving seat 60 of the control part. A battery 50 which stores electric power to be supplied to the electric motor 30 is provided at the hood part. An inverter device 80 which converts a direct current voltage of the battery 50 into an alternating current voltage is provided below the driver seat 60. A housing of the inverter device 80 is connected to the travelling vehicle body through a vibration control member formed of an elastic material.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to a work vehicle that travels in a park or the like and cuts turf or the like planted in the park.

Background Art

[0002] Conventionally, a means is known in which a work machine motor for driving a work machine is provided between electric motors for rear wheels that drive the rear wheels of a work vehicle, and a battery for supplying power to these electric motors is provided in the bonnet portion of the work vehicle. (Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, Patent Document 1 requires electrical components such as an electric work vehicle inverter device. If not properly installed, there is a risk of being affected by vibrations during driving or operation and hindering normal operation.

[0005] Therefore, an object of the present invention is to provide a work vehicle that can suppress the influence of vibrations on electrical components and prevent damage to the electrical components in an electric work vehicle.

Means for Solving the Problems

[0006] The present invention that solves the above problems is as follows.

[0007] That is, the invention according to claim 1 provides a pair of left and right front wheels (2) at the front of a traveling vehicle body (1), provides a pair of left and right rear wheels (3) at the rear of the traveling vehicle body (1), and on the traveling vehicle body (1) Mowing weeds such as lawn grass In a work vehicle equipped with a work implement (4), a bonnet (5) having a predetermined space formed therein is provided in front of the traveling body (1), a control section (6) on which a driver sits is provided behind the bonnet (5), an electric motor (30) for driving the rear wheels (3) is provided behind a driver's seat (60) of the control section (6), a battery (50) for storing power to be supplied to the electric motor (30) is provided in the bonnet (5), an inverter device (80) for converting a DC voltage of the battery (50) into an AC voltage is provided below the driver's seat (60), and a housing (80A) of the inverter device (80) is connected to the traveling body (1) via a vibration-proof member (86) formed of an elastic material. and including a shooter (46) for conveying the grass cut by the work implement (4) to a grass collection container (7), and forming a rear upward slope parallel to the upper wall of the shooter (46) at the rear rear part of the lower wall of the housing (80A), and arranging a harness (89) in the space between the lower wall of the housing (80A) and the upper wall of the shooter (46). This is a work vehicle characterized by the above.

[0009] Claim 2 The invention described in claim 1 connects a battery monitoring device (81) provided behind the inverter device (80) to a battery (50). 1 This is a work vehicle as described.

[0010] Claim 3 The invention described in claim 1 further includes an auxiliary battery (82) separate from the battery (50) provided on the side of the inverter device (80). 2 This is a work vehicle as described. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress the influence of vibrations on electrical components and prevent damage. . [Brief explanation of the drawings]

[0012]

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Embodiments for Carrying Out the Invention

[0013] As shown in Fig. 1, a work vehicle such as a riding lawn mower includes a traveling vehicle body 1, a pair of left and right front wheels 2 provided at the front of the traveling vehicle body 1, a pair of left and right rear wheels 3 provided at the rear of the traveling vehicle body 1, and a working machine 4 for mowing grass and the like provided between the front wheels 2 and the rear wheels 3 on the lower side of the traveling vehicle body 1. Further, a bonnet portion 5 is provided at the front upper side of the traveling vehicle body 1, a control portion 6 on which an operator rides is provided at the rear side of the bonnet portion 5, a safety frame (ROPS) 8 for protecting the operator is provided at the rear side of the control portion 6, and a grass collecting container 7 for storing the grass and the like mowed by the working machine 4 is provided at the lower portion of the safety frame 8.

[0014] As shown in Figs. 2 and 3, a battery 50 for storing electric power supplied to an electric motor 30 or the like for driving the rear wheels 3 is provided in the bonnet portion 5, and the battery 50 is covered with a bonnet cover 51. The bonnet cover 51 is supported by a support shaft (not shown) extending in the left - right direction provided at the front portion of the traveling vehicle body 1. Thereby, the space formed in the bonnet portion 5 can be effectively utilized, and the difference in the front - rear weight balance of the work vehicle can be suppressed.

[0015] Electrical components 61 are provided below the driver's seat 60 of the control portion 6. Thereby, the space formed below the driver's seat 60 can be effectively utilized.

[0016] The safety frame 8 is formed by a left support portion 8L extending in the vertical direction, a right support portion 8R extending in the vertical direction, and an inverted U - shaped connection connecting the upper portions of the left support portion 8L and the right support portion 8R Part 8 formed from A.

[0017] As shown in Figs. 4 to 7, below the electrical components 61, electric motors such as a synchronous motor or an induction motor operated by a three - phase AC voltage waveform for driving the rear wheels 3 Machine 3 0 is provided. The output shaft 30A formed to extend in the left-right direction of the electric motor 30 is connected to the upper part of a gearbox 31 that decelerates the output rotation transmitted from the output shaft 30A to increase the output torque or reverse the rotation direction. Note that the electric motor 30 is provided at a position offset to the left of the center in the left-right direction.

[0018] The output rotation increased or decreased in speed by the gearbox 31 is transmitted to a drive shaft 33 extending in the left-right direction via a differential gear 32 provided at the lower part of the gearbox 31 and formed by a differential gear or the like. The output rotation transmitted to the drive shaft 33 is transmitted to the rear wheels 3 supported at both ends of the drive shaft 33.

[0019] Below the electric motor 30, an electric motor such as a synchronous motor or an induction motor that is operated by a three-phase AC voltage waveform for driving the working machine 4 is provided. Machine 4 0 is provided. The output shaft 40A formed to extend in the front-rear direction of the electric motor 40 is connected to the rear part of a universal joint 41 provided to extend in the front-rear direction. Also, the output shaft 40A is provided above the drive shaft 33 and orthogonal to the drive shaft 33. Thereby, the space formed below the electric motor 30 can be effectively utilized. Also, since the transmission path between the electric motor 40 and the working machine 4 can be shortened, the output rotation of the electric motor 40 can be efficiently transmitted to the working machine 4. Note that the electric motor 40 is provided at a position offset to the left of the center in the left-right direction.

[0020] The front part of the universal joint 41 is connected to a gearbox 42 that decelerates the output rotation transmitted from the universal joint 41 to increase the output torque. The output rotation transmitted to the gearbox 42 is transmitted to a left cutting blade (not shown) provided in a left discharge passage 45L of the working machine 4 via an output shaft formed to extend in the vertical direction of the gearbox 42.

[0021] On the left part of the gearbox 42, a connecting member 43 extending in the left - right direction is connected. The right part of the connecting member 43 is connected to the gearbox 44. The output rotation transmitted to the gearbox 44 is transmitted to a right cutting blade (not shown) provided in the right discharge passage 45R of the working machine 4 via an output shaft formed to extend in the up - down direction of the gearbox 44. Note that the rotational speeds of the output rotations of the output shaft of the gearbox 42 and the output shaft of the gearbox 44 are the same, and the rotational directions are opposite. That is, in plan view, the output shaft of the gearbox 42 rotates clockwise, and the output shaft of the gearbox 44 rotates counterclockwise.

[0022] The discharge ports of the left discharge passage 45L and the right discharge passage 45R are connected to the inlet of a chute 46 that conveys the mown turf and the like to the grass collecting container 7. The discharge port of the chute 46 is connected to the inlet of the grass collecting container 7.

[0023] In plan view, the front part of the chute 46 is provided on the right side of the universal joint 41, and the rear part of the chute 46 is provided on the right side of the gearbox 31. In rear view, the chute 46 and the grass collecting container 7 are provided between the gearbox 31 and the right rear wheel 3. Thereby, a large chute 46 can be provided in the space formed on the right side of the universal joint 41 and the gearbox 31, and the mown turf and the like by the working machine 4 can be efficiently conveyed to the grass collecting container 7.

[0024] In side view, the upper wall of the chute 46 is formed to be inclined upward to the rear, and the rear part of the chute 46 is provided to extend downward below the electrical components 61. Thereby, the rear part of the chute 46 can be enlarged to prevent clogging of the mown turf and the like inside the chute 46.

[0025] As shown in FIGS. 8 and 9, the traveling vehicle body 1 is formed of a traveling vehicle body main body 10 that supports the front wheels 2 and the rear wheels 3 and a steering post 11 that supports the steering shaft 63.

[0026] The vehicle body 10 is formed with a left front-rear frame 10L and a right front-rear frame 10R extending in the fore-and-aft direction, and the lower part of the steering post 11 is formed with a left connecting portion 11L and a right connecting portion 11R extending forward.

[0027] The left connecting portion 11L is fixed to the left front and rear frame 10L by fastening means such as bolts, and the right connecting portion 11R is fixed to the right front and rear frame 10R by fastening means such as bolts, and these are integrated to form the traveling vehicle body 1.

[0028] A left support member 12L is provided at the front of the left front-rear frame 10L, and the connecting portion of the left support member 12L is inclined upward to the left. Also, a right support member 12R is provided at the front of the right front-rear frame 10R, and the connecting portion of the right support member 12R is inclined upward to the right. The left support member 12L and the right support member 12R are made of channel steel.

[0029] A left support member 13L is provided in front of the left connecting portion 11L, and the connecting portion of the left support member 13L is formed with an upward slope to the left. Also, a right support member 13R is provided in front of the right connecting portion 11R, and the connecting portion of the right support member 12R is formed with an upward slope to the right. The left support member 13L and the right support member 13R are made of channel steel.

[0030] At the bottom of the steering post 11, protrusions 14 are formed that protrude forward at a predetermined interval in the left-right direction, and a buffer member 15 made of a rubber material or the like is provided at the tip of the protrusions 14.

[0031] A left upper and lower frame 20L extending upward is provided at the rear of the left front and rear frame 10L, and a right upper and lower frame 20R extending upward is provided at the rear of the right front and rear frame 10R, and the upper parts of the left upper and lower frame 20L and the right upper and lower frame 20R are connected to a left and right frame 21 extending in the left-right direction.

[0032] A left connecting portion 22L to which a lower portion of a left support column portion 8L of the safety frame 8 is connected is provided at the left part of the left and right frame 21, and a right connecting portion 22R to which a lower portion of a right support column portion 8R of the safety frame 8 is connected is provided at the right part of the left and right frame 21.

[0033] As shown in FIG. 10, a lower portion of a battery 50 provided in the bonnet portion 5 is fitted inside a peripheral portion of a battery bracket 52. The battery 50 is formed by connecting a plurality of high energy density lithium ion batteries in series and in parallel. Thereby, the space formed in the bonnet portion 5 can be utilized. Further, since the lithium ion battery has a high energy density, the work vehicle can travel a long distance with one full charge.

[0034] As shown in FIG. 11, the battery bracket 52 is formed by a left and right front and rear frame 52L and a right and left front and rear frame 52R extending in the front-rear direction, a front left and right frame 52A connecting front portions of the left and right front and rear frame 52L and the right and left front and rear frame 52R, and a rear left and right frame 52B connecting rear portions of the left and right front and rear frame 52L and the right and left front and rear frame 52R. The left and right front and rear frame 52L and the right and left front and rear frame 52R are formed of angle steel materials, and the front left and right frame 52A and the rear left and right frame 52B are formed of channel steel materials.

[0035] The connecting portion of the left and right front and rear frame 52L is formed with an upward leftward inclination, and the connecting portion of the right and left front and rear frame 52R is formed with an upward leftward inclination. In a rear view, the upward leftward inclinations of the connecting portion of the left support member 13L, the connecting portion of the left support member 12L, and the connecting portion of the left and right front and rear frame 52L are formed at the same inclination angle, and the upward rightward inclinations of the connecting portion of the right support member 12R, the connecting portion of the right support member 12R, and the connecting portion of the right and left front and rear frame 52R are formed at the same inclination angle.

[0036] Round left vibration damping members 53L are provided at predetermined intervals in the front-rear direction on the lower surface of the connecting portion of the left and right front and rear frame 52L, and round right vibration damping members 53R are provided at predetermined intervals in the front-rear direction on the lower surface of the connecting portion of the right and left front and rear frame 52R.

[0037] The left front and rear frame 52L is connected to the left support member 12L of the left front and rear frame 10L and the left support member 13L of the left connecting portion 11L via a left vibration isolating member 53L, and the right front and rear frame 52R is connected to the right support member 12R of the right front and rear frame 10R and the right support member 13R of the right connecting portion 11R via a right vibration isolating member 53R. This prevents vibrations of the traveling vehicle body 10 that occur when the work vehicle is traveling from being transmitted to the battery 50, thereby preventing damage to the battery 50.

[0038] As shown in Figure 12, the connecting portion of the left front and rear frame 52L is arranged perpendicular to a left imaginary line 55L that connects the center of the left vibration-isolating member 53L and the center of the left front wheel 2L on the left side. Similarly, the connecting portion of the right front and rear frame 52R is arranged perpendicular to a right imaginary line 55R that connects the center of the right vibration-isolating member 53R and the center of the right front wheel 2R on the right side. This makes it possible to suppress large vibrations caused by unevenness in the riding surface via the front wheels 2 and rear wheels 3, thereby preventing damage to the battery 50. Reference numeral 57 denotes a front wheel support frame that supports the left and right front wheels 2, and reference numeral 56 denotes a connecting portion between the front wheel support frame and the traveling vehicle main body 10, and indicates the swing axis of the front wheel support frame.

[0039] Additionally, the tip of the buffer member 15 of the steering post 11 is pressed against the rear surfaces of the left and right rear frames 52B of the battery bracket 52. This prevents the battery 50 from moving rearward when the work vehicle starts, thereby preventing damage to the battery 50.

[0040] 13 and 14, a protective frame 58 is provided at the middle of the battery 50 in the front-to-rear direction, extending along the outer periphery of the battery 50. This makes it possible to prevent damage to the battery 50 when the work vehicle tips over.

[0041] The protective frame 58 includes a left support column 58L extending upward from the left front-rear frame 10L, a right support column 58R extending upward from the right front-rear frame 10R, and an inverted U-shaped connecting member that connects the upper portions of the left support column 58L and the right support column 58R. Part 5 It is made up of 8A.

[0042] In a side view, a virtual line 59 connecting the base of the connecting portion 58A of the protection frame 58 and the top of the connecting portion 8A of the safety frame 8 is formed to be located above the steering wheel 62. Thereby, a large protection space is formed below the virtual line 59, and when the work vehicle is running, it is possible to suppress the operator from colliding with external tree branches or the like and improve work safety.

[0043] As shown in FIGS. 2 and 3, a steering wheel 62 is provided on the front side of the driver's seat 60 of the control unit 6, and the steering wheel 62 is supported on the upper part of a steering shaft 63 extending in the vertical direction.

[0044] A cleaner lever 65 for operating the conveyance of the mowed grass remaining inside the shooter 46 to the rear grass collection container 7 or the like is provided on the left fender 64L on the left side of the driver's seat 60, and an operation lever 66 for operating the lift layer of the work implement 4 is provided on the fender 64R on the right side of the driver's seat 60. Also, a brake pedal 68 is provided at the left front part of the floor 67 on which the operator places his feet during operation, and a forward accelerator pedal 70 and a reverse accelerator pedal 71 are arranged side by side at the right front part.

[0045] As shown in FIGS. 15 to 17, the electrical components 61 provided in the space formed between the shooter 46 of the work implement 4 and the driver's seat 60 include an inverter device 80 that converts the DC voltage supplied from the battery 50 into an AC voltage and generates a three-phase AC voltage waveform for operating the motor 30 or the like, a battery monitoring device 81 that monitors the temperature, charge state, voltage protection, and short-circuit state of each cell of the battery 50, an auxiliary battery 82 such as a lead-acid battery that stores electricity for supplying a battery to a meter panel (not shown) that displays the traveling speed or the like provided on the front side of the driver's seat 60, and a converter device 83 that changes the DC voltage supplied from the battery 50 into a DC voltage for supplying to a sensor that detects the operation position of the cleaner lever 65 or the like.

[0046] Inverter device 80 is made up of inverter device 84 that operates electric motor 30 and inverter device 85 that operates electric motor 40. In addition, inverter device 84 also functions as a charging device that charges battery 50 with power supplied from electric motor 30 to inverter device 80 when regenerative braking is activated, that is, when forward accelerator pedal 75 or reverse accelerator pedal 76 is released and output shaft 30A rotates due to the inertial force of traveling vehicle body 1, causing electric motor 30 to operate as a generator.

[0047] In a plan view, an inverter device 80 is provided in the front below the driver's seat 60, and a battery monitoring device 81 is provided behind the inverter device 80. An auxiliary battery 82 is provided to the left of the inverter device 80, and a converter device 83 is provided behind the auxiliary battery 82 and to the left of the battery monitoring device 81. This makes it possible to effectively utilize the space formed below the driver's seat 60. Furthermore, by providing the heavy battery monitoring device 81 at the rear, the difference in weight applied to the front and rear of the traveling vehicle body main body 10 can be reduced, thereby improving traveling stability.

[0048] 18 and 19, the housing 80A of the inverter device 80 is formed from a box-shaped upper housing 90 with an open bottom and a box-shaped lower housing 91, and the front and rear walls of the upper housing 90 are fixed to the front and rear walls of the lower housing 91 with fastening members such as bolts to form an integrated unit. The upper housing 90 contains inverter device 84 and inverter device 85, and the lower housing 91 contains a junction for connecting harnesses, a charging relay, and the like.

[0049] In the left-right direction, the left walls of the upper housing 90 and the lower housing 91 are formed at the same position, and the right wall of the upper housing 90 is formed to extend further to the right than the right wall of the lower housing 91. This forms a space below the right part of the upper housing 90 and to the right of the right part of the lower housing 91, and as shown in Figure 20, it is possible to provide a biasing means 47 such as a spring that is provided on the right part of the working machine 4 and pulls up the working machine 4.

[0050] An opening 90A is formed in the upper right portion of the rear wall of the upper housing 90, through which a harness connecting the inverter device 84 and the electric motor 30 and a harness connecting the inverter device 85 and the electric motor 40 can be inserted. In addition, an opening 91A is formed in the lower left portion of the rear wall of the lower housing 91, through which a harness connecting the battery monitoring device 81 and a charging relay or the like can be inserted.

[0051] 21, the front wall of the upper housing 90 is formed so as to slope downward from the front end of the upper wall and then extend downward, thereby preventing the legs of the pilot seated in the pilot's seat 60 from coming into contact with the front wall of the upper housing 90.

[0052] The lower wall of the lower housing 91 extends rearward from the lower end of the front wall and is then formed with an upward rearward slope parallel to the upper wall of the chute 46 of the work implement 4. This prevents the portion of the harness 89 connecting the battery 50 and the battery monitoring device 81 that faces the lower rear part of the lower housing 91 from being excessively bent, as shown in FIG.

[0053] Round grommets (referred to as "vibration-damping members" in the claims) 86 are provided at the corners of the lower wall of the lower housing 91. The lower housing 91 is also connected via the grommets 86 to support members 16A extending in the front-rear direction and provided on both sides of left and right frames 16 extending in the left-right direction and provided at the rear of the traveling vehicle body 10. This suppresses transmission of vibrations of the traveling vehicle body 10 generated when the work vehicle is traveling to the inverter device 84 and other components, thereby preventing damage to the inverter device 84 and other components. Furthermore, as shown in FIG. 22 , a predetermined space is formed between the bottom wall of the lower housing 91 and the top wall of the chute 46 of the work implement 4, and this space can be used to easily route the harness 89 connecting the battery 50 and the battery monitoring device 81.

[0054] As shown in FIG. 23, a pair of right grommets, one in front and one in back, are provided on the right part of the bottom wall of the lower housing 91. Tractor 8 6R is a pair of left grommets provided on the left side of the bottom wall of the lower housing 91. Tractor 8This prevents the fixing pin 88, which passes through the right grommet 86R and extends downward from the support member 16A, from contacting the upper wall of the chute 46 of the work implement 4.

[0055] The fixing pin 88 inserted into the front left grommet 86L is formed thinner than the fixing pin 88 inserted into the rear left grommet 86L, and the fixing pin 88 inserted into the rear right grommet 86R is formed thinner than the fixing pin 88 inserted into the front left grommet 86L. This makes it possible to easily attach the lower housing 91 to the pair of left and right support members 16A via the fixing pins 88.

[0056] 24, round grommets 87 are provided at predetermined intervals in the front-to-rear and left-to-right directions on the bottom wall of the housing 81A of the battery monitoring device 81. Furthermore, the housing 81A is connected via the grommets 87 to the support frame 18, which is connected to the left and right frames 17 provided on the rear side of the left and right frames 16. This suppresses the transmission of vibrations of the traveling vehicle body 10 that occur when the work vehicle is traveling to the battery monitoring device 81, thereby preventing damage to the battery monitoring device 81. Furthermore, electric wires connecting the battery monitoring device 81 and the battery 50 can be inserted into the hollow portion formed in the grommet 87, making it easy to route the electric wires.

[0057] 25, the base of forward accelerator pedal 70 is rotatably supported on a spindle extending in the left-right direction and provided at the rear of support member 72 that stands upright at the front right part of floor 67, while the base of reverse accelerator pedal 71 is rotatably supported on a spindle extending in the left-right direction and provided at the middle part of support member 72 in the front-rear direction. The rotational angle of forward accelerator pedal 70, which corresponds to the amount of depression of forward accelerator pedal 70, and the rotational angle of reverse accelerator pedal 71, which corresponds to the amount of depression of reverse accelerator pedal 71, are measured by angle sensor 73, such as a potentiometer, provided at the front of support member 72.

[0058] The rotation angle measured by the angle sensor 73 is transmitted to the inverter device 80. As a result, in the inverter device 80, the frequency and amplitude of the three-phase AC voltage waveform are increased or decreased according to the transmitted rotation angle, and the output rotation of the output shaft 30A of the electric motor 30 can be increased or decreased in speed.

Explanation of Signs

[0059] 1 Traveling vehicle body 2 Front wheels 3 Rear wheels 4 Working machine 5 Bonnet part 6 Control part 8 Safety frame 8A Connecting part (first connecting part) 16 Left and right frames 16A Support member 30 Electric motor (first electric motor) 40 Electric motor (second electric motor) 46 Shooter 50 Battery 58 Protection frame 58A Connecting part (second connecting part) 59 Virtual line 60 Driver's seat 62 Steering wheel 80 Inverter device 80A Housing 81 Battery monitoring device 86 Grommet (vibration-proof member) 86L Left grommet (left vibration-proof member) 86R Right grommet (right vibration-proof member) 90 Upper housing 91 Lower housing

Claims

1. In a work vehicle provided with a pair of left and right front wheels (2) at the front of a traveling vehicle body (1), a pair of left and right rear wheels (3) at the rear of the traveling vehicle body (1), and a working machine (4) for mowing weeds such as turf attached to the traveling vehicle body (1), a bonnet part (5) with a predetermined space formed on the front side of the traveling vehicle body (1) is provided, and a control part (6) for the operator to board is provided on the rear side of the bonnet part (5), an electric motor (30) for driving the rear wheels (3) is provided below and at the rear side of the driver's seat (60) of the control part (6), a battery (50) for storing the electric power supplied to the electric motor (30) is provided on the bonnet part (5), an inverter device (80) for converting the DC voltage of the battery (50) into an AC voltage is provided below the driver's seat (60), the housing (80A) of the inverter device (80) is connected to the traveling vehicle body (1) via a vibration-proof member (86) formed of an elastic material, a work vehicle characterized by comprising a shooter (46) for transporting the grass cut by the working machine (4) to a grass collection container (7), the rear part of the rear side of the lower wall of the housing (80A) being formed in an upwardly inclined shape parallel to the upper wall of the shooter (46), and a harness (89) being arranged in the space between the lower wall of the housing (80A) and the upper wall of the shooter (46).

2. The work vehicle according to Claim 1, wherein the harness (89) connects a battery monitoring device (81) provided on the rear side of the inverter device (80) and the battery (50).

3. The work vehicle according to Claim 2, wherein an auxiliary battery (82) separate from the battery (50) is provided on the side of the inverter device (80).

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