Work vehicle

Abstract

To provide a work vehicle that allows a work while emitting no exhaust gas or even when emitting an exhaust gas with the small emission amount, furthermore, facilitates a work.SOLUTION: A work vehicle includes a hydraulic device C and a battery 10A. The battery 10A is held in a lower part of a machine body 3 on a lower side from the hydraulic device C and between travel devices on both right and left sides.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] As shown in Patent Document 1, there is a work vehicle equipped with traveling gear (traveling wheels) located on both the left and right sides of a machine body (body frame), and hydraulic equipment (hydraulic pumps as hydraulic supply sources). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-768 A Summary of the Invention [Problem to be solved by the invention]

[0004] Engine-equipped work vehicles emit exhaust gases, which can accumulate indoors in greenhouses and other areas. There is a demand for work vehicles that do not emit engine exhaust gases, or that can be used to carry out work while keeping the amount of exhaust gases to a minimum.

[0005] To provide a work vehicle which enables work to be carried out in a state in which no exhaust gas is discharged or, even if exhaust gas is discharged, the amount of discharge is small, and which makes work easy to carry out. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: The vehicle is equipped with running gear located on both the left and right sides of the body, hydraulic equipment, and a battery, and the battery is held in the lower part of the body below the hydraulic equipment and between the running gear on both the left and right sides.

[0007] According to this configuration, a power source driven by electric power obtained from a battery can be used, so an engine is not required and work can be performed in a state where no exhaust gas is emitted. Even if an engine is provided in addition to a power source driven by electric power, a smaller engine can be used than if only an engine is provided, so even if exhaust gas is emitted, work can be performed in a state where the amount of exhaust gas is small. Since the battery is mounted below the hydraulic equipment and between the left and right traveling gear on the underside of the body, the center of gravity of the entire work vehicle is low and is located between the left and right ground contact points in a plan view, allowing the work vehicle to travel stably and easily even on uneven ground, making it easy to work on.

[0008] In the present invention, It is preferable that the hydraulic device includes a hydraulic pump and an electric motor that drives the hydraulic pump, and that the hydraulic pump and the electric motor are located directly above the battery.

[0009] According to this configuration, the hydraulic pump and the electric motor do not extend outside the aircraft body beyond the range in which the battery is located in plan view, so the hydraulic pump, the electric motor and the battery can be positioned together in plan view.

[0010] In the present invention, It is preferable that the electric motor is held on the aircraft by connecting a mounting plate portion provided on the electric motor to a stay provided on the aircraft, and the hydraulic pump is held on the aircraft by being attached to the mounting plate portion.

[0011] According to this configuration, the electric motor is held in the aircraft body by connecting the mounting plate portion, which is easier to connect to the stay than the body of the electric motor, to the stay, making it easy to assemble the electric motor to the aircraft body. Since the mounting plate is used as a stay for mounting the hydraulic pump, there is no need to provide a special stay for the hydraulic pump, which can be done at a low cost.

[0012] In the present invention, It is preferable that an inverter connected to the electric motor is provided, and that the inverter is provided above the battery.

[0013] According to this configuration, since the work such as inspection of the inverter can be carried out above the battery, maintenance of the inverter can be easily carried out.

[0014] In the present invention, It is preferable that a protection circuit unit be provided for the inverter, and that the protection circuit unit be provided above the battery.

[0015] According to this configuration, since the inspection and other operations of the protection circuit section can be carried out above the battery, maintenance of the protection circuit section can be easily carried out.

[0016] In the present invention, It is preferable that the aircraft be provided with a charger capable of charging the battery with power supplied from outside the aircraft.

[0017] According to this configuration, when power is supplied to the charger from outside the aircraft, the battery is charged by the charger, so the battery can be charged while remaining held in the aircraft, making charging easy.

[0018] In the present invention, It is preferable that a guide rail be provided on the aircraft extending in the fore-and-aft direction of the aircraft between the battery storage space in the aircraft and the battery loading / unloading port portion of the aircraft, and capable of guiding the movement of the battery between the battery storage space and the battery loading / unloading port portion.

[0019] With this configuration, when the battery is removed from the aircraft, the guide rails move and guide the battery from the battery accommodating space to the battery loading / unloading opening, allowing the battery to be easily pulled out to the battery loading / unloading opening. When the battery is loaded into the aircraft, the guide rails move and guide the battery from the battery loading / unloading opening to the battery accommodating space, allowing the battery to be easily inserted into the battery accommodating space, making loading and unloading the battery easy.

[0020] In the present invention, It is preferable that an oil cooler is provided on the aircraft rear side of the battery accommodating space, and the battery loading / unloading opening is provided on the aircraft front side of the battery accommodating space.

[0021] According to this configuration, the oil cooler does not become an obstacle when loading and unloading the battery, and the effort of removing the oil cooler is eliminated.

[0022] In the present invention, It is preferable that each of the running devices on both the left and right sides is provided with front wheels and rear wheels, and that the front wheels and the rear wheels are each held on the body in a state in which they can be raised and lowered separately relative to the body.

[0023] According to this configuration, for example, when the work location is inclined in the left-right direction or the front-rear direction of the machine body, the front and rear wheels on both the left and right sides are raised and lowered, and the height positions of the front and rear wheels on both the left and right sides relative to the machine body are adjusted to a height position corresponding to the inclination of the work location, so that the machine body can be adjusted to a horizontal or nearly horizontal attitude regardless of the inclination of the work location. In other words, even on rough ground, the machine body can be maintained in a horizontal or nearly horizontal attitude by raising and lowering the front and rear wheels on both the left and right sides. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is a side view of the work vehicle as seen from the left side. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a side view showing the first battery, the hydraulic pump, the electric motor, etc. [Figure 4] FIG. 2 is a plan view showing the first battery, the hydraulic pump, the electric motor, etc. [Diagram 5] FIG. 2 is a front view showing the first battery, the hydraulic pump, etc. [Figure 6] FIG. 4 is a diagram showing a drive structure of a traveling device. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A work vehicle for transporting containers, etc. is shown in Figures 1 and 2. In the following description, with regard to the body of the work vehicle, the direction of arrow F shown in Figures 1 and 2 is the "front side of the body," the direction of arrow B shown in Figures 1 and 2 is the "rear side of the body," the direction of arrow U shown in Figure 1 is the "upper side of the body," the direction of arrow D shown in Figure 1 is the "lower side of the body," the direction of arrow L shown in Figure 2 is the "left side of the body," and the direction of arrow R shown in Figure 2 is the "right side of the body."

[0026] [About work vehicles in general] As shown in Figs. 1 and 2, the work vehicle includes a machine body 3 having a machine body frame 1 formed by connecting a plurality of steel materials such as steel pipes, a cover 2 surrounding the upper part of the machine body frame 1, and the like. The machine body 3 is supported by traveling devices 4 located on both the left and right sides of the machine body 3, and travels by the traveling devices 4 on both the left and right sides. A control unit 5 extends rearward from the upper part of the machine body 3. The control unit 5 is provided with a control lever 6 for operating the traveling operation of the machine body 3, and the like. A loading platform 7 on which a container or the like can be placed is provided on the upper part of the machine body 3. The loading platform 7 is located above the cover 2. A hydraulic pump 8 and an electric motor 9 for driving the traveling device 4 are provided below the loading platform 7. A first battery 10A, a second battery 10B, and the like are provided on the lower part of the machine body 3. The first battery 10A is a power source for driving the traveling device 4. The second battery 10B is a power source for control, and outputs power with a voltage lower than the voltage of the power output by the first battery 10A.

[0027] [About the driving mechanism] As shown in Figure 6, a hydraulic motor 22 is provided on each of the left and right traveling gears 4, and the left traveling gear 4 is configured to be driven by the left hydraulic motor 22, and the right traveling gear 4 is configured to be driven by the right hydraulic motor 22.

[0028] 1, 5, and 6, the left and right traveling devices 4 are each provided with a front wheel 23 and a rear wheel 24. The hydraulic motor 22 of the left traveling device 4 is provided with a hydraulic motor 22a for the left front wheel and a hydraulic motor 22b for the left rear wheel, so that the left front wheel 23 is driven by the hydraulic motor 22a for the left front wheel and the left rear wheel 24 is driven by the hydraulic motor 22b for the left rear wheel. The hydraulic motor 22 of the right traveling device 4 is provided with a hydraulic motor 22a for the right front wheel and a hydraulic motor 22b for the right rear wheel, so that the right front wheel 23 is driven by the hydraulic motor 22a for the right front wheel and the right rear wheel 24 is driven by the hydraulic motor 22b for the right rear wheel.

[0029] In each of the hydraulic motors 22a for the left front wheels, 22b for the left rear wheels, 22a for the right front wheels, and 22b for the right rear wheels, the output shaft of the hydraulic motor 22a for the front wheels is connected to the axle of the front wheels 23, and the output shaft of the hydraulic motor 22b for the rear wheels is connected to the axle of the rear wheels 24, making it possible to drive the front wheels 23 by the hydraulic motor 22a for the front wheels, and to drive the rear wheels 24 by the hydraulic motor 22b for the rear wheels.

[0030] As shown in FIG. 6, the left motor control valve unit 26 is connected to the left front operation oil passage 25a provided in the hydraulic motor 22a for the left front wheel and the left rear operation oil passage 25b provided in the hydraulic motor 22b for the left rear wheel. The right motor control valve unit 28 is connected to the right front operation oil passage 27a provided in the hydraulic motor 22a for the right front wheel and the right rear operation oil passage 27b provided in the hydraulic motor 22b for the right rear wheel. The left motor control valve unit 26 and the right motor control valve unit 28 are connected to a hydraulic pump 8 via an oil supply passage 29. The hydraulic pump 8 and a hydraulic oil tank 31 are connected via a suction oil passage 32. An oil cooler 33 is provided in the suction oil passage 32. The hydraulic pump 8 is interlocked with an electric motor 9, and the first battery 10A is connected to the electric motor 9 via an inverter 34. The inverter 34 is provided with a protection circuit unit 35. The protection circuit section 35 prevents a capacitor provided in the inverter 34 from being damaged due to an inflow of a large current, etc. The protection circuit section 35 includes a fuse.

[0031] The DC power stored in the first battery 10A is supplied to the inverter 34 and converted into AC power, and the AC power is supplied from the inverter 34 to the electric motor 9 to drive the electric motor 9. The hydraulic pump 8 is driven by the electric motor 9, and hydraulic oil stored in the hydraulic oil tank 31 is taken out to the hydraulic pump 8 through the suction oil passage 32. The hydraulic pump 8 takes out the hydraulic oil from the hydraulic oil tank 31 through the oil cooler 33, and the hydraulic oil cooled by the oil cooler 33 is taken out to the hydraulic pump 8. The taken out hydraulic oil is supplied from the hydraulic pump 8 to the left motor control valve unit 26 and the right motor control valve unit 28 through the oil supply passage 29. The hydraulic oil is supplied from the left motor control valve unit 26 to the hydraulic motor 22a for the left front wheel to drive the hydraulic motor 22a for the left front wheel, and the left front wheel 23 is driven by the hydraulic motor 22a for the left front wheel. Hydraulic oil is supplied from the left motor control valve unit 26 to the hydraulic motor 22b for the left rear wheel, so that the hydraulic motor 22b for the left rear wheel is driven, and the left rear wheel 24 is driven by the hydraulic motor 22b for the left rear wheel. Hydraulic oil is supplied from the right motor control valve unit 28 to the hydraulic motor 22a for the right front wheel, so that the hydraulic motor 22a for the right front wheel is driven, and the right front wheel 23 is driven by the hydraulic motor 22a for the right front wheel. Hydraulic oil is supplied from the right motor control valve unit 28 to the hydraulic motor 22b for the right rear wheel, so that the hydraulic motor 22b for the right rear wheel is driven, and the right rear wheel 24 is driven by the hydraulic motor 22b for the right rear wheel.

[0032] In this embodiment, each of the left and right traveling devices 4 is provided with front wheels 23 and rear wheels 24, and the front wheels 23 are driven by a front wheel hydraulic motor 22a, and the rear wheels 24 are driven by a rear wheel hydraulic motor 22b. However, each of the left and right traveling devices 4 may be provided with crawlers and one hydraulic motor for driving the crawlers.

[0033] As shown in FIGS. 3, 4 and 5, the vehicle frame 1 includes a first frame 1A located at the upper part of the vehicle frame 1, and a second frame 1B extending downward from the first frame 1A.

[0034] As shown in Figs. 3 and 5, the first frame 1A is provided with two first frame sections 11 arranged at a distance in the up-down direction. As shown in Figs. 3, 4, and 5, each of the two first frame sections 11 is made of steel materials such as longitudinally extending square steel pipes 11a extending in the longitudinal direction of the aircraft and horizontally extending square steel pipes connecting the longitudinally extending square steel pipes 11a. The two first frame sections 11 are connected at both lateral ends of the front end and both lateral ends of the rear end. In the upper first frame section 11 of the two first frame sections 11, the left and right longitudinally extending square steel pipes 11a are connected by connecting members 11b at three points in the middle of the first frame section 11 in the longitudinal direction.

[0035] As shown in Figures 3 and 5, the second frame 1B is provided with a vertical frame 12 extending downward from two points in the fore-and-aft direction of the lower of the two first frame portions 11 along the vertical direction of the aircraft.

[0036] As shown in FIG. 5, the two vertical frames 12 are formed in an upward U-shape and include left and right vertical frame portions 12a extending downward from both lateral sides of the lower first frame portion 11, and horizontal frame portions 12b connecting the lower portions of the left and right vertical frame portions 12a.

[0037] 3 and 5, in each of the two vertical frames 12, the middle parts in the up-down direction of the left and right vertical frame parts 12a are connected by a horizontal connecting frame 13. The connection of both ends of the horizontal connecting frame 13 to the vertical frame parts 12a is achieved by connecting the ends of the horizontal connecting frame 13 to the supports 12c provided on the vertical frame parts 12a with connecting bolts.

[0038] As shown in Fig. 3, a vertical intermediate portion of the left vertical frame portion 12a of the front vertical frame 12 of the two vertical frames 12 and a vertical intermediate portion of the left vertical frame portion 12a of the rear vertical frame 12 of the two vertical frames 12 are connected by a left front-rear connecting frame 14. A vertical intermediate portion of the right vertical frame portion 12a of the front vertical frame 12 of the two vertical frames 12 and a vertical intermediate portion of the right vertical frame portion 12a of the rear vertical frame 12 of the two vertical frames 12 are connected by a right front-rear connecting frame 14. The front ends of the left and right front-rear connecting frames 14 are connected to the vertical frame portion 12a of the front vertical frame 12 by connecting the front ends of the front-rear connecting frames 14 to the ends of the front lateral connecting frames 13. The rear ends of the left and right longitudinal connecting frames 14 are connected to the up-down frame portion 12a of the rear vertical frame 12 by connecting the rear ends of the longitudinal connecting frames 14 to the ends of the rear lateral connecting frames 13. The two vertical frames 12 are made of round steel pipes bent into a U-shape, reducing the weight of the aircraft frame 1.

[0039] [Regarding hydraulic pumps, hydraulic oil tanks, electric motors, and first battery] As shown in Fig. 3, a hydraulic pump 8, an electric motor 9, and a hydraulic oil tank 31 are provided below the loading platform 7. The hydraulic pump 8 and the hydraulic oil tank 31 are hydraulic equipment C. As shown in Figs. 1, 3, 4, and 5, the first battery 10A is held in the lower part of the machine body 3, below the hydraulic equipment C and the electric motor 9, and between the left and right traveling devices 4. The first battery 10A, which tends to be heavier than the hydraulic equipment C and the electric motor 9, is located between the left and right traveling devices 4, below the hydraulic equipment C and the electric motor 9, and is located at a position where the center of gravity of the entire work vehicle is low and between the left and right traveling devices 4 in a plan view.

[0040] More specifically, as shown in Fig. 3, a first stay 37 protrudes upward from the front of the left and right longitudinal connecting frames 14 provided on the second frame 1B, and a second stay 38 protrudes upward from the left and right longitudinal connecting frames 14 rearward of the first stay 37. A mounting plate portion 9a provided on the front of the electric motor 9 is connected to the first stay 37 by a connecting bolt, and a rear portion of the electric motor 9 is connected to the second stay 38 by a connecting bolt. The electric motor 9 is attached to the left and right longitudinal connecting frames 14 via the first stay 37 and the second stay 38.

[0041] 3 and 5, a flange portion 8a is provided at the rear of the hydraulic pump 8, and the flange portion 8a is connected to a mounting plate portion 9a of the electric motor 9 with a connecting bolt. The hydraulic pump 8 is attached to the left and right longitudinal connecting frames 14 via the mounting plate portion 9a and first stays 37.

[0042] 3 and 5 , the hydraulic oil tank 31 is provided behind the electric motor 9. The hydraulic oil tank 31 is placed on the left and right longitudinal connecting frames 14 and fixed to the left and right longitudinal connecting frames 14 by fastening bands 31a, and is held by the left and right longitudinal connecting frames 14.

[0043] The hydraulic pump 8 and hydraulic oil tank 31 , which are hydraulic equipment C, are held by the left and right longitudinal connecting frames 14 of the machine body 3 .

[0044] As shown in Figures 3 and 5, a battery storage space 40 is defined in the internal space of the body 3, in a portion located below the hydraulic equipment C and the electric motor 9 and between the left and right vertical frame portions 12a of the vertical frame 12.

[0045] As shown in Figs. 3 and 5, a pair of left and right guide rails 41 are provided at the bottom of the battery accommodating space 40. The pair of left and right guide rails 41 are attached across the front and rear horizontal frame portions 12b provided on the second frame 1B, and are held by the front and rear horizontal frame portions 12b in a state in which they extend in the front-rear direction of the fuselage 3. As shown in Figs. 3 and 5, the first battery 10A is placed on the pair of left and right guide rails 41 in the battery accommodating space 40, and is fixed to the pair of left and right guide rails 41 by switching a fixing mechanism (not shown) that fixes the first battery 10A to the guide rails 41 to an active state. The first battery 10A is held by the front and rear horizontal frame portions 12b via the pair of left and right guide rails 41 in the battery accommodating space 40.

[0046] The first battery 10A is held by the front and rear lateral frame portions 12b of the machine body 3, below the hydraulic equipment C and the electric motor 9 and between the left and right traveling devices 4.

[0047] 3, a battery loading / unloading opening 42 is provided in a portion of the body 3 that is located toward the front of the body away from the battery accommodating space 40. A pair of left and right guide rails 41 are provided between the battery accommodating space 40 and the battery loading / unloading opening 42.

[0048] When removing the first battery 10A from the body 3, the fixing mechanism (not shown) that fixes the first battery 10A to the guide rails 41 is switched to the released state and the first battery 10A is slid toward the front of the body. The first battery 10A is then guided by the pair of left and right guide rails 41 to move from the battery storage space 40 to the battery loading / unloading opening 42, and the first battery 10A can be easily pulled out into the battery loading / unloading opening 42.

[0049] When loading the first battery 10A into the body 3, the rear of the first battery 10A is placed on the front of the pair of left and right guide rails 41 at the battery loading / unloading opening 42 and the first battery 10A is slid toward the rear of the body. The first battery 10A is then guided by the pair of left and right guide rails 41 to move from the battery loading / unloading opening 42 to the battery storage space 40, and the first battery 10A can be easily inserted into the battery storage space 40.

[0050] [About hydraulic pumps and electric motors] 3, 4, and 5, the hydraulic pump 8 and the electric motor 9 are installed directly above the first battery 10A. The hydraulic pump 8 and the electric motor 9 are located within the range in which the first battery 10A is located in a plan view. The hydraulic pump 8 and the electric motor 9 can be prevented from protruding outside the aircraft body from the range in which the first battery 10A is located in a plan view.

[0051] 3 and 4, the hydraulic pump 8 and the electric motor 9 are arranged in the fore-and-aft direction of the machine body with the hydraulic pump 8 located further forward than the electric motor 9 and with the input shaft (not shown) of the hydraulic pump 8 and the output shaft (not shown) of the electric motor 9 facing forward and backward. The input shaft of the hydraulic pump 8 and the output shaft of the electric motor 9 are connected to each other with their shafts positioned on the same axis. This makes it easy to link the hydraulic pump 8 and the electric motor 9 together.

[0052] [About the oil cooler] 3, 4, and 5, the oil cooler 33 is provided on the rear side of the aircraft body relative to the battery storage space 40. The oil cooler 33 is connected to the rear vertical frame 12 by connecting parts provided on the periphery of the oil cooler 33, and is held by the rear vertical frame 12. When loading and unloading the first battery 10A, the oil cooler 33 does not become an obstacle, so there is no need to take the time to remove the oil cooler 33. The oil cooler 33 is provided on the front side of the aircraft body relative to the second battery 10B.

[0053] [About the second battery] 3 and 4, the second battery 10B is provided toward the rear of the aircraft body relative to the battery accommodating space 40. When loading and unloading the first battery 10A, the second battery 10B does not become an obstacle, and the effort of removing the second battery 10B is eliminated.

[0054] [About inverters] 4 and 5, the inverter 34 is provided above the first battery 10A. The inverter 34 is provided on the right lateral side of the electric motor 9. The inverter 34 is attached to a stay (not shown) that protrudes upward from the right longitudinal connecting frame 14, and is held by the right longitudinal connecting frame 14 via the stay.

[0055] [About the protection circuit] 3, 4, and 5, the protection circuit unit 35 is provided above the first battery 10A. The protection circuit unit 35 is housed in a box 43 provided above the electric motor 9. The box 43 is held by a support base 44. The support base 44 is connected to a mounting plate portion 9a provided on the electric motor 9 by a connecting bolt, and is held to the longitudinal connecting frame 14 via the mounting plate portion 9a.

[0056] [About the charger] As shown in Fig. 6, a charger 45 is connected to the first battery 10A. The charger 45 is equipped with a retractable charging cord (not shown). When the charging cord is connected to a power source (not shown) such as a charging stand located outside the aircraft body 3, power is supplied from the power source to the charger 45 via the charging cord, and the supplied power is charged into the first battery 10A by the charger 45. The first battery 10A can be charged by the charger 45 even if the first battery 10A is left loaded on the aircraft body 3.

[0057] The charger 45 is held by the first frame 1A inside the front cover 2B as shown in Figures 2, 3 and 4. The front cover 2B is held by the front cover frame 20 in a state in which it can swing up and down between a downward open position and an upward closed position with the pivot axis X located at the bottom as the opening and closing axis. When the front cover 2B is changed to the downward open position as shown by the two-dot chain line in Figure 1, the charger 45 is opened forward and the charger 45 can be used.

[0058] [Regarding front and rear wheels] As shown in Figs. 1 and 5, in each of the traveling devices 4 on the left and right sides, the front wheels 23 and the rear wheels 24 are held by the machine body 3 in a state in which they can be raised and lowered separately relative to the machine body.

[0059] More specifically, as shown in FIGS. 1 and 5, the front wheels 23 and the rear wheels 24 are each held to the vehicle frame 1 via a connecting mechanism 46.

[0060] 7 is a side view of the coupling mechanism 46 of the right front wheel 23 as seen from the left side. The coupling mechanism 46 of the right front wheel 23 includes an upper link 47 held by the support 19 provided on the first frame 1A so as to be swingable back and forth around the pivot axis P1, and a lower link 48 held by the free end of the upper link 47 so as to be swingable up and down around the pivot axis P2. The front wheel 23 is held by the free end of the lower link 48. A first hydraulic cylinder 49 is connected to the cylinder coupling portion 19a provided on the support 19 and the free end of the upper link 47. A second hydraulic cylinder 50 is connected to the base of the upper link 47 and the lower link 48.

[0061] In the connecting mechanism 46, the upper link 47 is swung around the pivot axis P1 as a swing fulcrum by the extension and contraction of the first hydraulic cylinder 49, thereby raising and lowering the connecting mechanism 46 relative to the first frame 1A, and the lower link 48 is swung around the pivot axis P2 as a swing fulcrum by the extension and contraction of the second hydraulic cylinder 50, thereby bending and extending the connecting mechanism 46 and changing the mounting height of the front wheel 23 relative to the body frame 1.

[0062] The coupling mechanisms 46 of the left front wheel 23, the left rear wheel 24 and the right rear wheel 24 are configured similarly to the coupling mechanism 46 of the right front wheel 23.

[0063] If the work location is inclined in the left-right or fore-aft direction of the machine body, the mounting height of the left and right front wheels 23 and the left and right rear wheels 24 relative to the machine body frame 1 can be adjusted to correspond to the inclination of the work location, thereby making it possible to adjust the attitude of the machine body 3 to a horizontal or nearly horizontal attitude regardless of the inclination of the work location in the left-right or fore-aft direction of the machine body.

[0064] 1 and 5, an auxiliary wheel 51 is held by the connecting mechanism 46 of each of the left front wheel 23, the left rear wheel 24, the right front wheel 23, and the right rear wheel 24. The auxiliary wheel 51 is held in a rotatable state with the pivot axis P2 as the center of rotation. When the swing angle of the upper link 47 and the swing angle of the lower link 48 reach the set swing angle, the auxiliary wheel 51 comes into contact with the ground together with the front wheel 23 and the rear wheel 24 to support the vehicle body 3.

[0065] [Regarding steering of the front and rear wheels] As shown in Fig. 7, an upper portion 52a of a holding member 52 that holds the front wheels 23 and the hydraulic motor 22a is held by a support portion 48a provided at the free end portion of the lower link 48 so as to be swingable about the steering axis P3 as a swing fulcrum. A steering cylinder 53 is connected to a cylinder connecting portion 52b provided at the upper portion 52a and a cylinder connecting portion 48b provided at the lower link 48. By extension and contraction of the steering cylinder 53, the holding member 52 is swung relative to the lower link 48 about the steering axis P3 as a swing fulcrum, thereby steering the front wheels 23. The left front wheel 23, the left rear wheel 24, and the right rear wheel 24 are each configured to be steered by the same steering mechanism as the steering mechanism for the right front wheel 23.

[0066] 4, a left control valve device 55 having a left motor control valve unit 26 and a left CPU device 56 controlling the left control valve device 55 are configured to control the first hydraulic cylinder 49, the second hydraulic cylinder 50, and the steering cylinder 53 of the left front wheel 23 and the left rear wheel 24, respectively, and are held on the first frame 1A on the inner side of the aircraft body than the left lateral cover 2A. A right control valve device 57 having a right motor control valve unit 28 and a right CPU device 58 controlling the right control valve device 57 are configured to control the first hydraulic cylinder 49, the second hydraulic cylinder 50, and the steering cylinder 53 of the right front wheel 23 and the right rear wheel 24, respectively, and are held on the first frame 1A on the inner side of the aircraft body than the right lateral cover 2A.

[0067] [About the cover] 1, 4 and 5, the cover 2 is provided below the loading platform 7. As shown in Figs. 1, 4 and 5, the cover 2 is provided with side covers 2A located on the outer left and right sides of the machine frame 1 and a front cover 2B located on the outer front side of the machine frame 1.

[0068] As shown in FIGS. 3 and 4, the left and right side covers 2A and the front cover 2B are held by a first frame 1A of the body frame 1.

[0069] More specifically, as shown in Fig. 4, the side cover 2A is provided with a side cover frame 17 attached to the inside of the side cover 2A. Connecting arms 18 extend from two locations in the front-rear direction of the side cover frame 17 toward the first frame side. Of the two connecting arms 18, the front connecting arm 18 is detachably connected to a support portion 19 provided in the front part of the first frame 1A by a connecting bolt. Of the two connecting arms 18, the rear connecting arm 18 is detachably connected to a support portion 19 provided in the rear part of the first frame 1A by a connecting bolt.

[0070] 1, 2, and 4, the front cover 2B is provided with front cover frames 20 that are located on the left and right sides of the front cover 2B and hold the front cover 2B. The left and right front cover frames 20 are bent into a horizontal U-shape in a side view so as to fit along the edges of the front cover 2B. The upper rear end portions of the left and right front cover frames 20 are connected to the front end portion of the upper first frame portion 11 of the first frame 1A, and the lower rear end portions of the left and right front cover frames 20 are connected to support portions 19 provided in the front portion of the first frame 1A.

[0071] [Another embodiment] (1) In the above embodiment, an example was shown in which the first battery 10A for driving the electric motor 9 is provided below the hydraulic equipment C and between the left and right traveling devices 4, but this is not limited to the example. For example, a control battery may be provided instead of the first battery 10A, or in the case of a vehicle equipped with an engine, a battery for driving the engine may be provided.

[0072] (2) In the above embodiment, an example was shown in which the hydraulic pump 8 is driven only by the electric motor 9. However, an engine may be provided in addition to the electric motor 9, and the hydraulic pump 8 may be driven by the power of both the electric motor 9 and the engine.

[0073] (3) In the above embodiment, the traveling device 4 is provided with the front wheels 23 and the rear wheels 24, the front wheels 23 and the rear wheels 24 are driven by the hydraulic motors 22a, 22b, and the front wheels 23 and the rear wheels 24 can be lifted and lowered separately. However, the present invention is not limited to this, and the traveling device 4 may be provided with crawlers that can be driven by a hydraulic motor. Furthermore, even if the traveling device 4 is provided with the front wheels 23 and the rear wheels 24, the front wheels 23 and the rear wheels 24 may not be lifted and lowered.

[0074] (4) In the above embodiment, an example was shown in which the charger 45 was provided, but the charger 45 may not be provided.

[0075] (5) In the above embodiment, an example was shown in which the hydraulic pump 8 and the electric motor 9 were provided directly above the first battery 10A. However, the hydraulic pump 8 and the electric motor 9 may also be provided in a position other than directly above the first battery 10A.

[0076] (6) In the above embodiment, the hydraulic pump 8 and the electric motor 9 are aligned in the fore-and-aft direction of the machine body with the hydraulic pump 8 located forward of the machine body relative to the electric motor 9, and the input shaft of the hydraulic pump 8 and the output shaft of the electric motor 9 are connected in the fore-and-aft direction of the machine body. However, this is not limited to the above. The hydraulic pump 8 and the electric motor 9 may be aligned in the fore-and-aft direction of the machine body with the hydraulic pump 8 located rearward of the electric motor 9. Even if the hydraulic pump 8 and the electric motor 9 are aligned in the fore-and-aft direction of the machine body, the input shaft of the hydraulic pump 8 and the output shaft of the electric motor 9 may be oriented in any direction, such as oriented laterally of the machine body. Furthermore, the hydraulic pump 8 and the electric motor 9 may be arranged in any arrangement, such as oriented laterally of the machine body.

[0077] (7) In the above embodiment, an example is shown in which the battery loading / unloading opening 42 is located forward of the aircraft body relative to the battery storage space 40, but the battery loading / unloading opening 42 may also be located rearward of the aircraft body relative to the battery storage space 40. [Industrial Applicability]

[0078] The present invention can be applied to work vehicles equipped with left and right traveling gears and hydraulic equipment, and work vehicles other than those for transporting luggage. [Explanation of symbols]

[0079] 3. Aircraft 4 Running gear 8. Hydraulic Pump 9. Electric Motor 9a Mounting plate part 10A 1st battery (battery) 23 Front wheel 24 Rear wheel 33 Oil cooler 34 Inverter 35 Protection circuit section 37 1st stay (stay) 40 Battery storage space 41 Guide rail 42 Battery loading / unloading port 45 Charger C. Hydraulic Equipment

Claims

1. Running gear located on both the left and right sides of the aircraft; Hydraulic equipment, A battery and a The battery is held under the body of the work vehicle, below the hydraulic equipment and between the left and right traveling devices.

2. The hydraulic device is provided with a hydraulic pump, An electric motor is provided to drive the hydraulic pump, 2. The work vehicle according to claim 1, wherein the hydraulic pump and the electric motor are located directly above the battery.

3. the electric motor is held on the airframe by connecting a mounting plate portion provided on the electric motor to a stay provided on the airframe, 3. The work vehicle according to claim 2, wherein the hydraulic pump is attached to the mounting plate portion and thereby held on the vehicle body.

4. an inverter connected to the electric motor; 3. The work vehicle according to claim 2, wherein the inverter is provided above the battery.

5. A protection circuit for the inverter is provided, 5. The work vehicle according to claim 4, wherein the protection circuit unit is provided above the battery.

6. 2. The work vehicle according to claim 1, further comprising a charger that is provided on the vehicle body and is capable of charging the battery with power supplied from outside the vehicle body.

7. A work vehicle as described in any one of claims 1 to 6, further comprising a guide rail provided on the vehicle body extending in the fore-and-aft direction of the vehicle body between a battery storage space in the vehicle body and a battery loading / unloading port portion in the vehicle body, and capable of guiding the movement of the battery between the battery storage space and the battery loading / unloading port portion.

8. An oil cooler is provided on the aircraft rear side relative to the battery housing space, The work vehicle according to claim 7, wherein the battery loading / unloading opening is provided on a forward side of the vehicle body relative to the battery storage space.

9. Each of the left and right running devices is provided with a front wheel and a rear wheel, 2. The work vehicle according to claim 1, wherein the front wheels and the rear wheels are supported on the vehicle body in a state in which they can be independently raised and lowered relative to the vehicle body.

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