Work vehicle

Abstract

A work vehicle is provided with drive wheels (2, 3), a work device (4) provided on a machine body frame (1), and a manipulation unit (5) provided on the upper side of the machine body frame (1), the manipulation unit (5) being on which a worker sits, the work vehicle being provided with an electric chamber (8) in which a first electric motor (30) for driving the work device (4) and a second electric motor (40) for driving the work device (4) are accommodated, and the second electric motor (40) being provided on the upper side of the machine body frame (1). The first electric motor (30) drives the driving wheels (2, 3), the second electric motor (40) drives the driving wheels (2, 3), the length direction of the first electric motor (30) is arranged along the front-back direction, the length direction of the second electric motor (40) is arranged along the front-back direction, and the first electric motor (30) and the second electric motor (40) are arranged side by side in the left-right direction. Provided is a work vehicle in which equipment is efficiently arranged in a space.

Description

Technical Field

[0001] This invention relates to a work vehicle for harvesting grass. Background Technology

[0002] A working vehicle is known to have a working device for harvesting grass arranged between the front and rear wheels, a battery arranged in the bonnet on the front side of the control unit, an electric motor for driving the rear wheels arranged on the upper rear side of the vehicle with the output shaft facing left and right, and an electric motor for driving the working device arranged on the lower rear side of the vehicle with the output shaft facing forward and backward (Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2023-27497. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The method in Patent Document 1 has the following problem: although multiple motors are arranged and housed in a space with the output shaft facing left and right or front and back, if the size of the motors becomes larger, it results in wasted space or makes it impossible to house them in the motor compartment.

[0008] Therefore, the present invention provides a work vehicle that efficiently configures equipment within a space in a work vehicle equipped with multiple electric motors.

[0009] Solution for solving the problem

[0010] The present invention that solves the above-mentioned problems is as follows.

[0011] That is, the present invention is a work vehicle, which is provided with drive wheels (2, 3), a work device (4) is provided on the frame (1), and an operating part (5) is provided on the upper side of the frame (1). The operating part (5) is for the operator to ride on. The work vehicle is characterized by having an electric compartment (8) which houses a first electric motor (30) and a second electric motor (40). The first electric motor (30) drives the work device (4), and the second electric motor (40) drives the drive wheels (2, 3). The length direction of the first electric motor (30) is arranged along the front-rear direction, and the length direction of the second electric motor (40) is arranged along the front-rear direction. The first electric motor (30) and the second electric motor (40) are arranged in a left-right direction.

[0012] The effects of the invention

[0013] According to the present invention, the first motor (30) and the second motor (40) can be efficiently arranged in the space of the motor compartment (8). Attached Figure Description

[0014] Figure 1 This is a 3D view of the work vehicle from the front left.

[0015] Figure 2 This is a 3D view of the front of the electric control room from the rear left side.

[0016] Figure 3 This is a 3D view of the rear of the electric control room from the left rear.

[0017] Figure 4 This is a top view of the electric control room.

[0018] Figure 5 This is a 3D view of the electric motor from the rear left side.

[0019] Figure 6 This is a top view of the electric motor.

[0020] Figure 7 This is a rear view of the electric motor.

[0021] Figure 8 This is a 3D view of the battery from the rear left side.

[0022] Figure 9 This is a top view of the electric compartment containing the batteries.

[0023] Figure 10 This is a top view of the electric motor and inverter unit.

[0024] Figure 11 This is a left-side view of the motor and inverter unit.

[0025] Figure 12 This is a transmission diagram showing the output rotation of an electric motor.

[0026] Figure 13 This is a left-side view of the electric control room.

[0027] Figure 14 This is a 3D view of the electric control room from the rear right side.

[0028] Figure 15 This is an illustration of the flow path of water circulating in electrical units, etc. Detailed Implementation

[0029] like Figure 1 As shown, the working vehicle has a pair of front wheels 2 on the lower front of the body frame 1, and a pair of rear wheels 3 on the lower rear of the body frame 1.

[0030] The front of the machine frame 1 is equipped with a working device 4 for harvesting grass growing in the field. The rear of the working device 4 is equipped with an operating unit 5 for the operator to ride on. The rear of the operating unit 5 is equipped with a safety frame (roll over protective structures) 6 to protect the operator. The rear of the safety frame 6 is equipped with a grass collection container 7 for storing the harvested grass. The lower side of the grass collection container 7 is equipped with an electric chamber 8, which is equipped with a second electric motor 40 and a battery 50, etc. The second electric motor 40 drives the rear wheel 3.

[0031] A steering column 10 supporting the steering wheel is provided on the front side of the driver's seat of the control unit 5. A monitor displaying the output speed of the second electric motor 40 is provided on the upper part of the steering column 10, and the lower part of the steering column 10 is fixed to the front of the floor.

[0032] A brake pedal 11 is provided on the left side of the steering column 10 in the floor to reduce the speed of the front wheel 2, and a gear shift pedal 12 is provided on the right side of the steering column 10 in the floor. The gear shift pedal 12 increases or decreases the output speed of the second motor 40.

[0033] The front wheel 2 is covered by a fender 13. A gear lever 14 is provided on the fender 13 located on the right side of the driver's seat. The second inverter device 45 is operated by the gear lever 14. The second inverter device 45 increases or decreases the output rotation of the second motor 40.

[0034] The rear of the working device 4 is connected to the front of the grass collection container 7 through a chute 16 extending in the front-back direction. A blower 17 is provided in the middle of the chute 16 in the front-back direction, and the blower 17 exhausts air into the chute 16.

[0035] A pair of link arms 18 are provided on the front of the left and right walls of the grass collection container 7. The front of the link arms 18 is fixed to the safety frame 6, which swings freely from side to side. The safety frame 6 and the link arms 18 are connected by a lifting component 19, such as an oil hydraulic cylinder. The rear of the lower wall of the grass collection container 7 is placed on the crossbeam 21A of the support frame 21, which will be described later. Thus, the lifting component 19 can be driven to raise and lower the grass collection container 7.

[0036] like Figure 2 , Figure 3As shown, the front electric compartment 8A in the electric compartment 8 is provided with: a first electric motor 30 for operation, which drives the working device 4; and a second electric motor 40 for travel, which drives the front wheel 2. The rear electric compartment 8B is provided with a battery 50, which stores the power supplied to the first electric motor 30, etc.

[0037] Viewed from above, the first motor 30 is positioned to the left of the centerline in the left-right direction of the frame 1, and the second motor 40 is positioned to the right of the centerline in the left-right direction of the frame 1. This reduces the weight difference between the weight applied to the left side of the centerline in the left-right direction and the weight applied to the right side of the centerline in the left-right direction of the frame 1, thereby improving operability.

[0038] In a side view, a support frame 20 is provided at the dividing part between the front electric chamber 8A and the rear electric chamber 8B, which extends upward from the body frame 1; a support frame 21 is provided at the rear end of the rear electric chamber 8B, which extends upward from the body frame 1.

[0039] The support frame 20 is formed by a left longitudinal frame 20L, a right longitudinal frame 20R, and a cross frame 20A. The left longitudinal frame 20L extends upward from the middle of the left side of the frame 1, the right longitudinal frame 20R extends upward from the middle of the right side of the frame 1, and the cross frame 20A extends in the left-right direction to the upper part connecting the left longitudinal frame 20L and the right longitudinal frame 20R.

[0040] The support frame 21 is formed by a left longitudinal frame 21L, a right longitudinal frame 21R, and cross frames 21A and 21B. The left longitudinal frame 21L extends upward from the rear left end of the fuselage frame 1, and the right longitudinal frame 21R extends upward from the rear right end of the fuselage frame 1. The cross frame 21A extends in a left-right direction above the upper part connecting the left longitudinal frame 21L and the right longitudinal frame 21R, and the cross frame 21B extends in a left-right direction in the middle part connecting the left longitudinal frame 21L and the right longitudinal frame 21R. Furthermore, the left part of the cross frame 21B extends further to the left than the left longitudinal frame 21L, and the right part of the cross frame 21B extends further to the right than the right longitudinal frame 21R.

[0041] The middle part of the left longitudinal frame 20L is connected to the left end of the cross frame 21B via the left front-rear frame 22L extending in the front-rear direction, and the middle part of the right longitudinal frame 20R is connected to the right end of the cross frame 21B via the right front-rear frame 22R extending in the front-rear direction. Therefore, by positioning the rear of the battery 50 above the drive shaft 46 of the rear wheel 3, significant deformation of the frame 1 can be prevented.

[0042] The upper part of the left longitudinal frame 20L is connected to the middle part of the left longitudinal frame 23L located at the rear of the control unit 5 via the left front and rear frame 24L extending in the front and rear direction. The upper part of the right longitudinal frame 20R of the support frame 20 is connected to the middle part of the right longitudinal frame 23R located at the rear of the control unit 5 via the right front and rear frame 24R extending in the front and rear direction.

[0043] like Figure 4 As shown, the length of the first motor 30 is arranged along the front-to-back direction. The second motor 40 is arranged adjacent to the left side of the first motor 30, and its length is also arranged along the front-to-back direction.

[0044] A radiator 60 is provided on the outer side of the left wall of the electric motor chamber 8, which cools the water used to cool the first electric motor 30, etc. A fan 61 is provided between the radiator 60 and the first electric motor 30, which blows outside air toward the electric motor chamber 8. A circular opening (not shown) is formed in the left wall of the electric motor chamber 8 opposite to the fan 61. This helps to suppress the temperature rise of the first electric motor 30, etc., and prevents malfunction of the first electric motor 30, etc. Alternatively, the fan 61 can also be provided to the left of the radiator 60.

[0045] An auxiliary battery 65 is provided on the outer side of the right wall of the electric compartment 8, opposite the radiator 60, which stores power supplied to the monitor of the control unit 5. This helps to suppress the weight difference between the left and right sides of the work vehicle.

[0046] like Figures 5 to 7 As shown, the output shaft 30A of the first motor 30 is connected to the first reducer 31, which is located below the first motor 30. The first output shaft 31A of the first reducer 31 extends forward and is connected to the working clutch 32, which is located between the first reducer 31 and the transmission path of the working device 4.

[0047] The output shaft 40A of the second electric motor 40 is connected to the second reducer 41, which is located in front of the second electric motor 40. The second output shaft 41A of the second reducer 41 extends forward, and the output shaft 41B of the second reducer 41 extends rearward and is connected to the 4WD (four-wheel drive) clutch 43. The 4WD clutch 43 is located between the second reducer 41 and the transmission path of the rear wheel 3 and performs switching between front-wheel drive and four-wheel drive.

[0048] In a rear view, the first motor 30 and the second motor 40 are arranged at the same height in the vertical direction. Therefore, by placing the first motor 30 and the second motor 40 at the lower part of the front motor compartment 8A, space can be ensured above the first motor 30 and the second motor 40 for installing a monitoring unit 72 that monitors the status of the battery 50.

[0049] exist Figures 5 to 7The diagram shows a first motor 30 and a second motor 40 of the same size; however, the first motor 30 can also be replaced with a larger motor than the second motor 40. This allows for smooth driving of the working device 4, which is always driven to apply a larger load.

[0050] like Figure 8 As shown, the battery 50 is formed by four battery modules 50A. The upper parts of the four battery modules 50A are connected by a pair of left and right corner-shaped mounting brackets 51, and the lower parts are connected by a pair of left and right corner tube-shaped mounting brackets 52. The mounting brackets 51 are arranged at predetermined intervals in the left and right direction and extend in the front and back direction, and the mounting brackets 52 are arranged at predetermined intervals in the left and right direction and extend in the front and back direction.

[0051] The front portion of the mounting bracket 51 extends forward beyond the battery 50, and the rear portion of the mounting bracket 51 extends rearward beyond the battery 50. Furthermore, the mounting bracket 52 extends from the front end of the battery 50 to the rear end.

[0052] like Figure 3 , Figure 9 As shown, the front part of the mounting bracket 51 is detachably fixed to the crossbar 20A of the support frame 20 by bolts or other fastening components, and the rear part of the mounting bracket 51 is detachably fixed to the crossbar 21A of the support frame 21 by bolts or other fastening components.

[0053] The mounting bracket 52 on the left is placed on the left front and rear frame 22L, and the mounting bracket 52 on the right is placed on the right front and rear frame 22R.

[0054] Openings 51A are formed at the front and rear of the mounting bracket 51, through which a suspension hook is inserted when the battery 50 is replaced. This allows for easy installation and removal of the battery 50 from the support brackets 20 and 21, thus facilitating battery 50 replacement.

[0055] like Figure 10 , Figure 11As shown, a first inverter device 35 is provided at a predetermined interval in the front-rear direction behind the first motor 30, driving the first motor 30; a second inverter device 45 is provided at a predetermined interval in the front-rear direction behind the second motor 40, driving the second motor 40. Furthermore, the first inverter device 35 and the second inverter device 45 are provided at a predetermined interval in the front-rear direction on the front side of the battery 50. This allows for easy configuration of the first motor 30, the second motor 40, and the first inverter devices 35 and 45. Moreover, air supplied from the fan 61 passes through the gaps between the first motor 30, the second motor 40, and the first inverter devices 35 and 45, thereby efficiently cooling the first motor 30, the second motor 40, and the first inverter devices 35 and 45.

[0056] like Figure 12 As shown, the output rotation of the first motor 30's output shaft 30A is reduced in speed by the first reducer 31 and then output from the first reducer 31's first output shaft 31A and output shaft 31B.

[0057] The output rotation of the first output shaft 31A is transmitted to the working PTO (Power Take-Off) 33 via the working clutch 32 to drive the working device 4. In addition, the output rotation of the output shaft 31B is transmitted to the hydraulic pump 34, which pressurizes and delivers oil to the lifting components 19, etc.

[0058] Furthermore, the output rotation of the output shaft 30A of the first motor 30 is transmitted to the blower PTO37 via the blower clutch 36 to drive the blower 17.

[0059] The output rotation of the output shaft 40A of the second motor 40 is reduced in speed by the second reducer 41 and then output from the second output shaft 41A of the second reducer 41.

[0060] The output rotation of the second output shaft 41A is transmitted to the differential gear 42 for the front wheels to drive the front wheels 2, and then transmitted to the differential gear 44 for the rear wheels via the 4WD clutch 43. The output rotation of the differential gear 44 is transmitted to the drive shaft 46 to drive the rear wheels 3.

[0061] like Figure 13 , Figure 14 As shown, a power receiving port 70 is provided on the upper rear side of the radiator 60, which receives power from a household power source.

[0062] An electrical unit 71 is located on the underside of the battery 50, which houses a charger 71A and a converter 71B. The charger 71A converts the AC power supplied to the power receiving port 70 into DC power and supplies it to the battery 50. The converter 71B steps down the DC voltage supplied via the power distribution unit 73 to the rated voltage of the auxiliary battery 65. Furthermore, the electrical unit 71 is detachably fixed to the underside of the left front and rear frame 22L and the right front and rear frame 22R.

[0063] A monitoring unit 72 with a built-in monitoring device is provided on the front side of the battery 50. The monitoring device monitors the temperature and voltage of the battery 50. The monitoring unit 72 is detachably fixed to the upper side of the left front and rear frame 24L and the right front and rear frame 24R.

[0064] In a side view, the upper wall of the monitoring unit 72 is preferably located lower than the mounting bracket 51. As a result, since the monitoring unit 72 can be prevented from protruding further upward than the mounting bracket 51 and the vertical height of the electric chamber 8 can be set lower, the center of gravity of the grass collection container 7 disposed on the upper side of the electric chamber 8 can be set at a lower position, thereby enabling the working vehicle to drive stably.

[0065] A power distribution unit 73 is provided on the lower side of the monitoring unit 72. The power distribution unit 73 has a built-in terminal block for distributing the power supplied from the monitoring unit 72 to the first inverter device 35, the second inverter device 45, and the converter 71B of the electrical unit 71. The power distribution unit 73 is detachably fixed to the lower side of the left front and rear frames 24L and the right front and rear frames 24R.

[0066] A pressure valve 60A is provided on the upper part of the radiator 60, and a cooling pump 63 is provided on the lower rear side of the radiator 60, which pressurizes and delivers the water cooled by the radiator 60. A spare tank 64 is provided on the rear side of the radiator 60, which stores spare water, and the spare water circulates in the radiator 60.

[0067] like Figure 15 As shown, water pressurized and supplied by cooling pump 63 flows into flow path 66A and flow path 66B. Flow path 66A circulates through the cooling components installed in the first motor 30 and the first inverter device 35, and returns to the radiator 60. Flow path 66B circulates through the cooling components installed in the electrical unit 71, the second motor 40, and the second inverter device 45, and returns to the radiator 60. This efficiently cools the first motor 30, which generates more heat due to its higher torque output than the second motor 40 in order to drive the operating device 4.

[0068] The cooling components installed in the electrical unit 71 are positioned higher than the cooling pump 63. In a side view, from bottom to top, the liquid levels of the cooling components installed in the electrical unit 71, the cooling components installed in the first inverter unit 35 and the second inverter unit 45, and the cooling components installed in the first motor 30 and the second motor 40 are arranged sequentially, with the liquid level of the cooling components installed in the first motor 30 and the second motor 40 being the highest. Furthermore, in a side view, the pressure valve 60A of the radiator 60 is positioned higher than the liquid levels of the cooling components installed in the first motor 30 and the second motor 40. Therefore, since air and water inside the cooling pump 63 are exhausted to the outside through the pressure valve 60A of the radiator 60 via the cooling components installed in the electrical unit 71, air entrainment in the cooling pump 63 can be suppressed, preventing malfunctions of the cooling pump 63. Furthermore, the liquid level referred to in this specification refers to the upper surface of the water flowing into the cooling components installed in the electrical unit 71 when the work vehicle is stopped in a horizontal position in a side view.

Claims

1. A work vehicle, equipped with drive wheels (2, 3), a work device (4) mounted on a frame (1), and an operating unit (5) mounted on the upper side of the frame (1), the operating unit (5) being used by a worker to ride on. The aforementioned operating vehicles are characterized by, An electric chamber (8) is provided, which houses a first electric motor (30) and a second electric motor (40). The first electric motor (30) drives the working device (4), and the second electric motor (40) drives the drive wheels (2, 3). The first motor (30) is arranged along the front-to-back direction in the length direction, and the second motor (40) is arranged along the front-to-back direction in the length direction, and the first motor (30) and the second motor (40) are arranged in a left-to-right direction.

2. The working vehicle according to claim 1, characterized in that, The first motor (30) and the second motor (40) are set to the same height in the vertical direction.

3. The operating vehicle according to claim 1, characterized in that, The first motor (30) is made to be a motor that can output higher torque than the second motor (40).

4. The working vehicle according to claim 1, characterized in that, A fan (61) is provided on the left and right sides of the electric chamber (8) to blow outside air into the electric chamber (8).

5. The working vehicle according to claim 4, characterized in that, A radiator (60) is provided on the left and right sides of the fan (61) to cool the water circulating in the first motor (30) and the second motor (40).

6. The operating vehicle according to claim 4, characterized in that, A battery (50) is provided at the rear of the aforementioned electric chamber (8). This battery (50) stores the power supplied to the aforementioned first electric motor (30) and the aforementioned second electric motor (40). A first inverter device (35) is provided between the first motor (30) and the battery (50), and the first inverter device (35) drives the first motor (30). A second inverter device (45) is provided between the second motor (40) and the battery (50), and the second inverter device (45) drives the second motor (40).

7. The operating vehicle according to claim 6, characterized in that, From a top view, the battery (50) is arranged in an overlapping manner on the upper side of the drive shaft (46) that extends in the left-right direction along the rear wheel (3).

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