Work vehicle

Abstract

To configure a simple structure for cooling a battery in a work vehicle.SOLUTION: A work vehicle includes: travel devices 2, 3 supporting a machine body 1; a battery 46; and a cabin 10 supported by the machine body 1 so as to house a driving section 9 that includes a driver seat 7, where the battery 46 is installed to a roof 56 of the cabin 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the configuration of a traveling drive system for a work vehicle. [Background technology]

[0002] BACKGROUND ART As disclosed in Patent Document 1, a tractor, which is an example of a work vehicle, includes a motor and a battery that supply power to a traveling device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-65349 Summary of the Invention [Problem to be solved by the invention]

[0004] When a motor that supplies power to a traveling device is provided as in Patent Document 1, the inverter that operates the motor needs to be cooled, and the battery also needs to be cooled. The present invention aims to provide a simple structure for cooling an inverter and a battery in a work vehicle provided with a motor that supplies power to a traveling device. [Means for solving the problem]

[0005] The work vehicle of the present invention is equipped with a running device that supports the body, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter is provided inside the cabin, a vibration-damping section that supports the cabin on the body in a vibration-damping manner, and the inverter is provided behind the backrest of the driver's seat.

[0006] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature.

[0007] According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter.

[0008] In some work vehicles, the cabin is configured to be supported on the vehicle body by vibration isolation sections in order to improve the riding comfort of the driver. According to the present invention, the inverter is provided in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the inverter, thereby reducing inverter failures due to vibrations.

[0009] According to the present invention, the space behind the backrest of the driver's seat can be effectively utilized to arrange the inverter without any difficulty.

[0010] In the present invention, it is preferable that the inverter is provided below a seat portion of the driver's seat.

[0011] According to the present invention, the space below the seat of the driver's seat can be effectively utilized to arrange the inverter without any difficulty.

[0012] In the present invention, it is preferable that a side panel is provided on a side of the driver's seat along the front-rear direction, and the inverter is provided below the side panel.

[0013] According to the present invention, the inverter can be comfortably arranged by effectively utilizing the space below the side panel provided on the side of the driver's seat.

[0014] The work vehicle of the present invention is equipped with a running device that supports the body, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter is provided inside the cabin, a vibration-isolating section that supports the cabin on the body in a vibration-isolating manner is provided, and the inverter is provided on the roof section of the cabin.

[0015] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature. According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter. In some work vehicles, the cabin is configured to be supported on the vehicle body by vibration isolation sections in order to improve the riding comfort of the driver. According to the present invention, the inverter is provided in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the inverter, thereby reducing inverter failures due to vibrations. According to the present invention, the space in the roof of the cabin can be effectively utilized, and the inverter can be arranged without difficulty.

[0016] In the present invention, it is preferable that a support pillar is provided on the side of the cabin so as to span the roof portion, and that conditioned air from the air conditioner is supplied to the inverter through a duct provided inside the support pillar.

[0017] According to the present invention, when the inverter is provided on the roof of the cabin, conditioned air from the air conditioner is supplied to the inverter through a duct provided inside a support pillar on the side of the cabin. This makes effective use of the cabin's support pillars, which can be said to be an existing structure, so that air conditioned by the air conditioner can be supplied to the inverter without any strain, which is advantageous in terms of simplifying the structure for cooling the inverter.

[0018] The work vehicle of the present invention comprises a running device that supports the body, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter is provided inside the cabin, a vibration-isolating section that supports the cabin on the body in a vibration-isolating manner is provided, and the battery is provided behind the backrest of the driver's seat.

[0019] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature. According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter. In some work vehicles, the cabin is configured to be supported on the vehicle body by vibration isolation sections in order to improve the riding comfort of the driver. According to the present invention, the inverter is provided in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the inverter, thereby reducing inverter failures due to vibrations. According to the present invention, a battery is provided inside the cabin. Therefore, if a cooling device for cooling the battery is provided, the battery cooling is performed by the battery cooling device while the battery cooling is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the battery cooling device more than necessary. If the battery can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a battery cooling device. According to the present invention, by effectively utilizing an air conditioner, which can be said to have an existing configuration, it is not necessary to increase the capacity of the battery cooling device more than necessary, and it is not necessary to provide a battery cooling device, thereby simplifying the structure for cooling the battery. According to the present invention, when the battery temperature drops, such as in winter, the air conditioner can maintain a relatively warm temperature inside the cabin, thereby warming up the battery, which is advantageous in terms of maintaining battery performance.

[0020] According to the present invention, the battery is mounted in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the battery, thereby reducing battery failure due to vibrations. According to the present invention, the space behind the backrest of the driver's seat can be effectively utilized to comfortably locate the battery.

[0021] In the present invention, it is preferable that the battery is provided below the seat portion of the driver's seat.

[0022] According to the present invention, a battery is provided inside the cabin. Therefore, if a cooling device for cooling the battery is provided, the battery cooling is performed by the battery cooling device while the battery cooling is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the battery cooling device more than necessary. If the battery can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a battery cooling device. According to the present invention, by effectively utilizing an air conditioner, which can be said to have an existing configuration, it is not necessary to increase the capacity of the battery cooling device more than necessary, and it is not necessary to provide a battery cooling device, thereby simplifying the structure for cooling the battery. According to the present invention, when the battery temperature drops, such as in winter, the air conditioner can maintain a relatively warm temperature inside the cabin, thereby warming up the battery, which is advantageous in terms of maintaining battery performance.

[0023] According to the present invention, the battery is mounted in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the battery, thereby reducing battery failure due to vibrations. According to the present invention, the space below the seat of the driver's seat can be effectively utilized to comfortably arrange the battery.

[0024] In the present invention, it is preferable that a side panel is provided on a side of the driver's seat along the front-rear direction, and the battery is provided below the side panel.

[0025] According to the present invention, a battery is provided inside the cabin. Therefore, if a cooling device for cooling the battery is provided, the battery cooling is performed by the battery cooling device while the battery cooling is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the battery cooling device more than necessary. If the battery can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a battery cooling device. According to the present invention, by effectively utilizing an air conditioner, which can be said to have an existing configuration, it is not necessary to increase the capacity of the battery cooling device more than necessary, and it is not necessary to provide a battery cooling device, thereby simplifying the structure for cooling the battery. According to the present invention, when the battery temperature drops, such as in winter, the air conditioner can maintain a relatively warm temperature inside the cabin, thereby warming up the battery, which is advantageous in terms of maintaining battery performance.

[0026] According to the present invention, the battery is mounted in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the battery, thereby reducing battery failure due to vibrations. According to the present invention, the space below the side panel provided on the side of the driver's seat can be effectively utilized to comfortably arrange the battery.

[0027] The work vehicle of the present invention is equipped with a running device that supports the body, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter is provided inside the cabin, an anti-vibration section that supports the cabin on the body in an anti-vibration manner, and the battery is provided on the roof of the cabin.

[0028] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature. According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter. In some work vehicles, the cabin is configured to be supported on the vehicle body by vibration isolation sections in order to improve the riding comfort of the driver. According to the present invention, the inverter is provided in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the inverter, thereby reducing inverter failures due to vibrations. According to the present invention, a battery is provided inside the cabin. Therefore, if a cooling device for cooling the battery is provided, the battery cooling is performed by the battery cooling device while the battery cooling is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the battery cooling device more than necessary. If the battery can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a battery cooling device. According to the present invention, by effectively utilizing an air conditioner, which can be said to have an existing configuration, it is not necessary to increase the capacity of the battery cooling device more than necessary, and it is not necessary to provide a battery cooling device, thereby simplifying the structure for cooling the battery. According to the present invention, when the battery temperature drops, such as in winter, the air conditioner can maintain a relatively warm temperature inside the cabin, thereby warming up the battery, which is advantageous in terms of maintaining battery performance.

[0029] According to the present invention, the battery is mounted in a cabin that is supported on the aircraft body in a vibration-isolating manner by a vibration-isolating section, which makes it difficult for vibrations from the aircraft body when it is running to be transmitted to the battery, thereby reducing battery failure due to vibrations. According to the present invention, the space in the roof of the cabin can be effectively utilized to comfortably arrange the battery.

[0030] In the present invention, it is preferable that a support pillar is provided on the side of the cabin so as to span the roof portion, and that conditioned air from the air conditioner is supplied to the battery through a duct provided inside the support pillar.

[0031] According to the present invention, when the battery is installed on the roof of the cabin, conditioned air from the air conditioner is supplied to the battery through ducts provided inside the support pillars on the sides of the cabin. This makes effective use of the cabin's support pillars, which can be considered an existing structure, and allows air-conditioned air to be supplied to the battery without any strain, which is advantageous in terms of simplifying the structure for cooling the battery.

[0032] The work vehicle of the present invention is equipped with a running device that supports the body, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter is provided inside the cabin, the air conditioner is provided on the roof of the cabin, a support pillar is provided on the side of the cabin so as to span the roof, and conditioned air from the air conditioner is supplied to the inverter through a duct provided inside the support pillar.

[0033] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature. According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter. According to the present invention, when an air conditioner is installed on the roof of the cabin, conditioned air from the air conditioner is supplied to the inverter through a duct installed inside a support pillar on the side of the cabin. This makes effective use of the cabin's support pillars, which can be said to be an existing structure, so that air conditioned by the air conditioner can be supplied to the inverter without any strain, which is advantageous in terms of simplifying the structure for cooling the inverter.

[0034] The work vehicle of the present invention is equipped with a running gear that supports the body, a battery, a motor that supplies power to the running gear, an inverter that operates the motor, a cabin supported on the body to accommodate a driver's section with a driver's seat, and an air conditioner that conditions the interior of the cabin, the inverter being provided inside the cabin, the air conditioner being provided on the roof of the cabin, and a support pillar being provided on the side of the cabin so as to span the roof, and the conditioned air from the air conditioner being supplied to the battery through a duct provided inside the support pillar.

[0035] Some work vehicles are equipped with a cabin that houses a driver's seat and an air conditioner that controls the temperature inside the cabin. The air conditioner maintains the temperature inside the cabin at a comfortable temperature for the driver, and particularly in the summer, the temperature inside the cabin is maintained at a relatively low, cool temperature. According to the present invention, an inverter is provided inside the cabin. As a result, if a cooling device for cooling the inverter is provided, the inverter is cooled by the cooling device for the inverter while the cooling of the inverter is assisted by the relatively low ambient temperature of the air conditioner, so there is no need to increase the capacity of the cooling device for the inverter more than necessary.If the inverter can be cooled by the relatively low temperature air conditioned by the air conditioner, there is no need to provide a cooling device for the inverter. According to the present invention, by effectively utilizing an air conditioner that can be said to have an existing configuration, it is not necessary to increase the capacity of the cooling device for the inverter more than necessary, and it is not necessary to provide a cooling device for the inverter, which simplifies the structure for cooling the inverter. According to the present invention, when the temperature of the inverter drops, such as in winter, the temperature inside the cabin can be maintained at a relatively warm temperature by the air conditioner, thereby warming up the inverter, which is advantageous in terms of maintaining the performance of the inverter. According to the present invention, when an air conditioner is installed on the roof of the cabin, conditioned air from the air conditioner is supplied to the battery through ducts installed inside the support pillars on the sides of the cabin. This makes effective use of the cabin's support pillars, which can be considered an existing structure, and allows air-conditioned air to be supplied to the battery without any strain, which is advantageous in terms of simplifying the structure for cooling the battery.

[0036] In the present invention, it is preferable that the air conditioner is provided behind the backrest of the driver's seat.

[0037] According to the present invention, the space behind the backrest of the driver's seat can be effectively utilized to comfortably locate the air conditioner.

[0038] In the present invention, it is preferable that the air conditioner be provided below the seat of the driver's seat.

[0039] According to the present invention, the space below the driver's seat can be effectively utilized to comfortably locate the air conditioner.

[0040] In the present invention, it is preferable that a side panel is provided on a side of the driver's seat along the front-rear direction, and the air conditioner is provided below the side panel.

[0041] According to the present invention, the air conditioner can be comfortably arranged by effectively utilizing the space below the side panel provided on the side of the driver's seat.

[0042] In the present invention, it is preferable that a first reservoir for storing cooling oil, a second reservoir for storing cooling water, a first pump, and a second pump are provided, and that the cooling oil in the first reservoir is supplied to the motor by the first pump and returned from the motor to the first reservoir, and that the cooling water in the second reservoir is supplied to the inverter by the second pump and returned from the inverter to the second reservoir.

[0043] The motor that supplies power to the traveling device generally tends to reach a higher temperature than the inverter due to the running load, and a relatively large temperature difference occurs between the motor and the inverter. According to the present invention, a first reservoir for storing cooling oil and a second reservoir for storing cooling water are provided, and the cooling oil in the first reservoir is supplied to the motor by a first pump and returned to the first reservoir, and the cooling water in the second reservoir is supplied to the inverter by a second pump and returned to the second reservoir.

[0044] According to the present invention, cooling oil for cooling the motor and cooling water for cooling the inverter are provided separately, so that it is possible to set a cooling oil suitable for the motor, which has a relatively high temperature, and a cooling water suitable for the inverter, which has a lower temperature than the motor. This allows the motor (cooling oil) and the inverter (cooling water) to be cooled efficiently without affecting each other. According to the present invention, by using cooling oil suitable for the motor, which has a relatively high temperature, and cooling water suitable for the inverter, which has a lower temperature than the motor, it is advantageous in that the motor and inverter can be cooled efficiently.

[0045] In the present invention, it is preferable that a first supply system, through which the cooling oil in the first storage section is supplied from the first pump to the motor, is provided with a cooling section that cools the cooling oil, and a second supply system, through which the cooling water in the second storage section is supplied from the second pump to the inverter, is provided with a radiator that cools the cooling water.

[0046] According to the present invention, the cooling oil is cooled by the cooling section, and low-temperature cooling oil is supplied to the motor, which is advantageous in terms of cooling the motor. According to the present invention, the coolant is cooled in the radiator, and low-temperature coolant is supplied to the inverter, which is advantageous in terms of cooling the inverter.

[0047] In the present invention, it is preferable that the cooling section has a heat exchanger that is provided across the first supply system and the second supply system and exchanges heat between the cooling oil and the cooling water.

[0048] According to the present invention, heat exchange takes place between the cooling oil of the first supply system and the cooling water of the second supply system in the heat exchanger, and the heat of the cooling oil of the first supply system is absorbed by the cooling water of the second supply system, thereby suppressing the temperature of the cooling oil of the first supply system (or the heat of the cooling water of the second supply system is absorbed by the cooling oil of the first supply system, thereby suppressing the temperature of the cooling water of the second supply system), which is advantageous in terms of efficiently cooling the motor and the inverter.

[0049] If an oil cooler that cools the cooling oil is provided separately from the heat exchanger, the heat exchanger performs heat exchange between the cooling oil of the first supply system and the cooling water of the second supply system, thereby reducing the burden on the oil cooler and allowing the oil cooler to be made smaller. If the cooling oil is sufficiently cooled by heat exchange between the cooling oil of the first supply system and the cooling water of the second supply system using a heat exchanger, there is no need to provide an oil cooler for the cooling oil.

[0050] In the present invention, it is preferable that the cooling section has an oil cooler that cools the cooling oil.

[0051] According to the present invention, the cooling oil is directly cooled by the oil cooler and low-temperature cooling oil is supplied to the motor, which is advantageous in terms of cooling the motor.

[0052] In the present invention, it is preferable that the cooling water in the second reservoir is supplied to the inverter and the battery by the second pump and returned from the inverter and the battery to the second reservoir.

[0053] According to the present invention, the cooling water of the second pump not only cools the inverter but also cools the battery, which is advantageous in terms of simplifying the structure of the cooling systems for the inverter and battery. [Brief explanation of the drawings]

[0054] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. [Figure 3] FIG. 1 is a schematic diagram showing the interior of a hybrid mission. [Figure 4] 3 is a schematic diagram showing an outline of cooling and lubrication of a first motor generator and a second motor generator, and an outline of cooling of an inverter. FIG. [Figure 5] FIG. 10 is a cross-sectional plan view of a cabin in a second alternative embodiment of the invention. [Figure 6] FIG. 10 is a left side view of a tractor according to a sixth alternative embodiment of the invention. [Figure 7] FIG. 13 is a left side view of a tractor according to an eighth alternative embodiment of the present invention. [Figure 8] FIG. 13 is a left side view of a tractor according to a ninth alternative embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0055] A tractor, which is an example of a work vehicle, is shown in Figures 1 to 8. In Figures 1 to 8, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the rightward direction, and L indicates the leftward direction.

[0056] (Overall configuration of the tractor) As shown in Figure 1, the vehicle body 1 is supported by right and left front wheels 2 (corresponding to the running gear) and right and left rear wheels 3 (corresponding to the running gear), a hood 6 is provided at the front of the vehicle body 1, and a driver's section 9 is provided at the rear of the vehicle body 1.

[0057] The machine body 1 has an engine 5, a clutch housing 11 (corresponding to a first storage section) connected to the rear of the engine 5, a transmission case 12 connected to the rear of the clutch housing 11, and a front frame 14 connected to the front of the engine 5. The clutch housing 11 and the transmission case 12 form a hybrid transmission 4.

[0058] An engine 5 is covered by a hood 6. A driver's section 9 is covered and housed in a cabin 10 supported by the aircraft body 1. The front wheels 2 are supported by the front frame 14. Right and left rear axle cases 31 are connected to the rear of the transmission case 12 (aircraft body 1) and are provided so as to extend outward from the rear of the transmission case 12 (aircraft body 1) to the right and left sides, and the rear wheels 3 are supported by the rear axle cases 31.

[0059] (Configuration related to support of working equipment) 1, a single top link 32 and right and left lower links 34 are provided at the rear of the transmission case 12 so as to be able to swing up and down and extend rearward. A working implement such as a rotary tiller (not shown) or a plow (not shown) is connected to and supported by the top link 32 and the lower links 34. A PTO shaft 26 is provided at the rear of the transmission case 12, and power from the PTO shaft 26 is transmitted to the working implement via a transmission shaft (not shown).

[0060] Right and left lift arms 35 are provided to be able to swing up and down on the upper rear portion of the transmission case 12. Right and left lift cylinders 36 are connected between the lift arms 35 and the rear portion of the transmission case 12. A linking rod 37 is connected between the lift arms 35 and the lower link 34, and when the lift arms 35 are raised and lowered by the lift cylinders 36, the lower link 34 is raised and lowered, and the working device is raised and lowered.

[0061] (Clutch housing configuration) As shown in FIG. 3, inside the clutch housing 11, there are provided a clutch 13, a hydraulic pump 15, a first motor generator 21 (corresponding to a motor), and a second motor generator 22 (corresponding to a motor).

[0062] A clutch 13 is connected to the output shaft 5a of the engine 5, and a transmission shaft 16 is connected to the clutch 13 and extends from inside the clutch housing 11 to the rear part of the interior of the transmission case 12. A cylindrical shaft 17 is rotatably attached to the transmission shaft 16 and extends from inside the clutch housing 11 to the front part of the interior of the transmission case 12. A hydraulic pump 15 and a first motor-generator 21 are attached to the transmission shaft 16, and a second motor-generator 22 is attached to the cylindrical shaft 17.

[0063] (Transmission system inside the transmission case) As shown in Figure 3, inside the transmission case 12, a planetary gear unit 18, a forward / reverse switching device 19, an auxiliary transmission 20, a rear wheel differential device 23, a front wheel transmission 24, a PTO clutch 30, a PTO transmission 25, and a PTO shaft 26 are provided.

[0064] The power of the engine 5 (or the power of the first motor generator 21) is transmitted to the PTO transmission device 25 via the transmission shaft 16 and the PTO clutch 30, where the speed is changed, and then transmitted to the PTO shaft .

[0065] The interior of the clutch housing 11 is separated from the interior of the transmission case 12 by a rear wall 11a of the clutch housing 11 and a front wall 12a of the transmission case 12. A transmission shaft 16 and a cylindrical shaft 17 pass through the wall 11a of the clutch housing 11 and the wall 12a of the transmission case 12.

[0066] A cylindrical shaft 27 is rotatably attached to the transmission shaft 16. The planetary device 18 includes a sun gear, a plurality of planet gears and carriers, a ring gear, and the like. The power of the engine 5 (or the power of the first motor generator 21) and the power of the second motor generator 22 are combined and changed in speed in the planetary device 18, and this power is transmitted from the planetary device 18 to the cylindrical shaft 27.

[0067] The forward / reverse switching device 19 has a forward clutch, a reverse clutch, etc. In the forward / reverse switching device 19, when the forward clutch is operated to a transmission state, the power of the cylindrical shaft 27 is transmitted to the transmission shaft 33 in a forward state. When the reverse clutch is operated to a transmission state, the power of the cylindrical shaft 27 is transmitted to the transmission shaft 33 in a reverse state.

[0068] The auxiliary transmission 20 is configured to be able to change speeds between high and low speeds, and power that has been changed to a high speed state and a low speed state is transmitted to the transmission shaft 38. The power transmitted to the transmission shaft 38 is transmitted from the rear wheel output shaft 40 to the rear wheel differential device 23, and from the rear wheel differential device 23 to the rear wheels 3.

[0069] The front wheel transmission 24 has a standard clutch, an accelerating clutch, etc., and power branched off immediately before the rear wheel differential device 23 is transmitted to the front wheel transmission 24. When the front wheels 2 are steered to the right or left within a set angle range from the straight ahead position, the standard clutch is operated into a transmission state, and the front wheels 2 and rear wheels 3 are driven at the same speed. When the front wheels 2 are steered to the right or left beyond the set angle range, the speed-up clutch is operated into a transmission state, and the front wheels 2 are driven at a higher speed than the rear wheels 3.

[0070] (Configuration of the first motor generator and the second motor generator) As shown in FIGS. 3 and 4, an inverter 45 and a battery 46 are provided for the first motor generator 21 and the second motor generator 22.

[0071] When the first motor generator 21 (second motor generator 22) operates as a motor and supplies power to the transmission shaft 16 (cylindrical shaft 17), the DC power of the battery 46 is converted to AC power by the inverter 45 and supplied to the first motor generator 21 (second motor generator 22), causing the first motor generator 21 (second motor generator 22) to operate as a motor (drive mode).

[0072] When the first motor generator 21 (second motor generator 22) is driven to operate as a generator, the AC power generated by the first motor generator 21 (second motor generator 22) is converted into DC power by the inverter 45 and charged into the battery 46 (charging mode).

[0073] A control device (not shown) sets the charging mode and driving mode of the first motor generator 21 and the charging mode and driving mode of the second motor generator 22 based on the state of the working device (not shown) attached to the machine body 1, the running state of the machine body 1, etc.

[0074] In this case, the basic running state is one in which the first motor generator 21 is set to the charging mode and the second motor generator 22 is set to the driving mode. In the basic driving state, the power of the engine 5 is transmitted to the carrier of the planetary gear 18, and the power of the second motor generator 22 is transmitted to the sun gear of the planetary gear 18. In the planetary gear 18, the power of the engine 5 and the power of the second motor generator 22 are combined and changed in speed, and this power is transmitted from the ring gear of the planetary gear 18 to the cylindrical shaft 27.

[0075] By operating the clutch 13 to the disengaged state, it is also possible to stop the engine 5 and run the vehicle in the drive mode of the first motor generator 21 and the second motor generator 22.

[0076] (Cabin configuration) As shown in Figures 1 and 2, the cabin 10 has a front floor section 39, a rear floor section 44, right and left first pillars 41, right and left second pillars 42 (corresponding to pillars), right and left third pillars 43, a windshield 57, right and left doors 58, right and left rear windows 68, a rear hatch glass 69, and a roof section 56, and the interior of the cabin 10 is the driver's section 9.

[0077] The front floor portion 39 is disposed at a relatively low position. The rear floor portion 44 is disposed at a higher position than the front floor portion 39, and a support plate 55 is disposed above the rear floor portion 44 with a gap therebetween. The first support pillar 41 extends upward from the right and left parts of the front of the front floor portion 39, and the second support pillar 42 and the third support pillar 43 extend upward from the right and left parts of the rear of the rear floor portion 44 and the support plate 55.

[0078] The roof portion 56 is attached to the top of the first support column 41, the second support column 42, and the third support column 43. The roof portion 56 is manufactured by blow molding, and the inside of the roof portion 56 is hollow. With the above configuration, the second support pillar 42 (support pillar) is provided on the side of the cabin 10 so as to span the roof portion 56.

[0079] A windshield 57 is attached between the right and left first support pillars 41. The right and left doors 58 are made of transparent hard glass and are attached to the second support pillars 42 with hinge members 59 so that they can be opened and closed. The right and left rear windows 68 are attached across the second support pillars 42 and the third support pillars 43. A rear hatch glass 69 is attached to the right and left third support pillars 43 so that it can be opened and closed around a central axis (not shown) that runs along the left-right direction at the top.

[0080] Right and left frames 70 are connected to the right and left parts of the lower part of the cabin 10 along the front-to-rear direction, right and left frames 71 are connected to the frames 70, and right and left fenders 72 are attached to the frames 70, 71.

[0081] The front portions of the right and left frames 70 are supported on the right and left portions of the clutch housing 11 (airframe 1) by right and left vibration-isolating rubber members 73 (corresponding to vibration-isolating parts). Brackets 71a are connected to the right and left frames 71, and right and left suspension mechanisms 74 (corresponding to vibration-isolating parts) having suspension springs and dampers are attached between the brackets 71a of the frames 71 and the rear axle case 31 (airframe 1).

[0082] With the above configuration, vibration-isolating rubber 73 (vibration-isolating part) and suspension mechanism 74 (vibration-isolating part) are provided to support the cabin 10 on the aircraft body 1 in a vibration-isolating manner, and the cabin 10 is supported on the aircraft body 1 via the vibration-isolating rubber 73 (vibration-isolating part) and suspension mechanism 74 (vibration-isolating part).

[0083] (Configuration of the driving section) 1 and 2, a steering wheel 8 is provided in front of the driver's section 9 (cabin 10), and a forward / reverse lever 75 for operating a forward / reverse switching device 19 (see FIG. 3) is provided on the left side below the steering wheel 8. An accelerator pedal 76 for operating an accelerator section (not shown) of the engine 5 is provided on the right side of the front floor section 39.

[0084] The driver's seat 7 has a seat portion 7a and a backrest portion 7b, and the seat portion 7a of the driver's seat 7 is attached to the support plate 55. The right side panel 77 is provided on the right side of the driver's seat 7 along the front-to-rear direction, and the left side panel 78 is provided on the left side of the driver's seat 7 along the front-to-rear direction.

[0085] An auxiliary speed change lever 79 for operating the auxiliary transmission 20 (see FIG. 3), a PTO speed change lever 80 for operating the PTO transmission 25 (see FIG. 3), and a PTO switch 81 for operating the PTO clutch 30 (see FIG. 3) are provided on the right side panel 77. A lifting lever 82 for operating a control valve (not shown) for supplying and discharging hydraulic oil to and from the lifting cylinder 36 is provided on the right side panel 77.

[0086] (Lubricant for clutch housing and transmission case) 4, a lubricating oil (corresponding to cooling oil) with a relatively low viscosity is stored in the bottom of the clutch housing 11. The amount of lubricating oil is set so that the oil level L1 of the lubricating oil stored in the clutch housing 11 is low enough not to come into contact with the first motor-generator 21 and the second motor-generator 22.

[0087] 3, lubricating oil having a higher viscosity than the lubricating oil in the clutch housing 11 is stored in the transmission case 12. A sufficient amount of lubricating oil is stored in the transmission case 12 so that the oil level of the lubricating oil stored in the transmission case 12 is higher than the oil level L1 of the lubricating oil in the clutch housing 11, and the transmission case 12 serves as an oil bath.

[0088] The lubricating oil stored in the clutch housing 11 (lubricating oil for cooling the first motor generator 21 and the second motor generator 22) and the lubricating oil stored in the transmission case 12 are set to be different.

[0089] The interior of the clutch housing 11 is separated from the interior of the transmission case 12 by a rear wall 11a of the clutch housing 11 and a front wall 12a of the transmission case 12. This prevents the lubricating oil stored in the clutch housing 11 (lubricating oil for cooling the first motor-generator 21 and the second motor-generator 22) from mixing with the lubricating oil stored in the transmission case 12.

[0090] (Configuration related to cooling and lubrication of the first motor generator and the second motor generator) 4, a hydraulic pump 15 (corresponding to the first pump), an oil cooler 48 (corresponding to the cooling unit), an injection pump 49, and an injection nozzle 50 are provided for the first motor generator 21 and the second motor generator 22. A heat exchanger 60 (corresponding to the cooling unit) is provided for the first motor generator 21, the second motor generator 22, and the inverter 45.

[0091] The hydraulic pump 15 is driven by the transmission shaft 16, and the lubricating oil in the clutch housing 11 is sucked into the hydraulic pump 15 through a relatively fine filter 47. The lubricating oil sucked into the hydraulic pump 15 is supplied from the hydraulic pump 15 through a path 51 (corresponding to the first supply system) to a heat exchanger 60, and from the heat exchanger 60 through a path 52 (corresponding to the first supply system) to be supplied to an oil cooler 48 where it is cooled.

[0092] The lubricating oil cooled by the oil cooler 48 passes through a path 53 (corresponding to a first supply system) and is supplied to an injection pump 49. A plurality of injection nozzles 50 are provided inside the clutch housing 11 so as to face respective parts of the first motor generator 21 and the second motor generator 22.

[0093] Lubricating oil from the injection pump 49 is supplied to the injection nozzle 50 through a path 54. The lubricating oil is supplied from the injection nozzle 50 to each part of the first motor generator 21 and each part of the second motor generator 22, thereby cooling and lubricating the first motor generator 21 and the second motor generator 22.

[0094] The lubricating oil that has cooled and lubricated the first motor generator 21 and the second motor generator 22 naturally falls from the first motor generator 21 and the second motor generator 22 and returns to the bottom of the clutch housing 11.

[0095] With the above configuration, the lubricating oil (cooling oil) in the clutch housing 11 (first reservoir) is supplied to the first motor generator 21 (motor) and the second motor generator 22 (motor) by the hydraulic pump 15 (first pump), and then returns from the first motor generator 21 (motor) and the second motor generator 22 (motor) to the clutch housing 11 (first reservoir).

[0096] An oil cooler 48 (cooling section) that cools the lubricating oil (cooling oil) is provided in paths 51, 52, 53 (first supply system) through which the lubricating oil (cooling oil) in the clutch housing 11 (first reservoir) is supplied from the hydraulic pump 15 (first pump) to the first motor generator 21 (motor) and the second motor generator 22 (motor).

[0097] (Air conditioner configuration) As shown in Figures 1 and 2, inside the cabin 10 (driver's section 9), an air conditioner 83 is supported on the lower part of the rear floor section 44. Right and left ducts 84 extend from the air conditioner 83, pass through the inside of the right and left second support columns 42, and extend to the roof section 56. A plurality of air outlets (not shown) are provided on the lower part of the roof section 56.

[0098] With the above configuration, conditioned air from the air conditioner 83 is supplied through the duct 84 to the outlet on the roof section 56, and then supplied from the outlet on the roof section 56 to the inside of the cabin 10 (driving section 9), thereby air-conditioning the inside of the cabin 10 (driving section 9).

[0099] (Inverter and battery cooling configuration) 1 and 2, inside the cabin 10 (driver's section 9), an inverter 45 is provided along the vertical direction behind the backrest 7b of the driver's seat 7. A battery 46 is provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor section 44.

[0100] As a result, the inverter 45 and the battery 46 are provided inside the cabin 10 (drive unit 9), and the inverter 45 and the battery 46 are provided in an atmosphere of a relatively low temperature created by the air conditioner 83.

[0101] 4, a cooling water tank 61 (corresponding to the second storage section), a water pump 62 (corresponding to the second pump), and a radiator 63 are provided for the inverter 45. Cooling water is stored in the cooling water tank 61, and the water pump 62 is driven by the power of the engine 5.

[0102] The cooling water in the cooling water tank 61 is sucked in by the water pump 62, supplied from the water pump 62 to the heat exchanger 60 through a path 64 (corresponding to the second supply system), and then supplied from the heat exchanger 60 to the radiator 63 through a path 65 (corresponding to the second supply system) where it is cooled.

[0103] The cooling water cooled by the radiator 63 is supplied to the inverter 45 through a path 66 (corresponding to the second supply system) to cool the inverter 45, and the cooling water that has cooled the inverter 45 returns to the cooling water tank 61 through a path 67.

[0104] Lubricating oil from the clutch housing 11 is supplied to the heat exchanger 60 via the hydraulic pump 15 and a path 51, and cooling water from the cooling water tank 61 is supplied to the heat exchanger 60 via the water pump 62 and a path 64.

[0105] In the heat exchanger 60, heat is exchanged between the lubricating oil in the clutch housing 11 and the cooling water in the cooling water tank 61 (the heat of the lubricating oil in the clutch housing 11 is absorbed by the cooling water in the cooling water tank 61, or the heat of the cooling water in the cooling water tank 61 is absorbed by the lubricating oil in the clutch housing 11).

[0106] With the above configuration, inverter 45 is cooled by the cooling water in cooling water tank 61 in the relatively low ambient temperature created by air conditioner 83, and the relatively low ambient temperature created by air conditioner 83 assists in cooling inverter 45. Battery 46 is cooled by the relatively low temperature air created by air conditioner 83.

[0107] Cooling water in a cooling water tank 61 (second storage unit) is supplied to the inverter 45 by a water pump 62 (second pump), and returns from the inverter 45 to the cooling water tank 61 (second storage unit).

[0108] A radiator 63 for cooling the cooling water is provided in paths 64, 65, 66 (second supply system) along which the cooling water in a cooling water tank 61 (second reservoir) is supplied from a water pump 62 (second pump) to the inverter 45.

[0109] A heat exchanger 60 for exchanging heat between the lubricating oil (cooling oil) and the cooling water is provided across the paths 51, 52, 53 (first supply system) and the paths 64, 65, 66 (second supply system). A cooling section having an oil cooler 48 and a heat exchanger 60 is provided as a configuration for cooling the lubricating oil (cooling oil).

[0110] When a configuration is used in which heat exchange between the lubricating oil in the clutch housing 11 and the cooling water in the cooling water tank 61 is performed by the heat exchanger 60 (a configuration in which the heat of the lubricating oil in the clutch housing 11 is absorbed by the cooling water in the cooling water tank 61), it is possible to reduce the size of the oil cooler 48. If the above-mentioned heat exchange is performed sufficiently, it is not necessary to provide the oil cooler 48.

[0111] (First Alternative Embodiment of the Invention) In the configuration shown in Figures 1 and 2, the battery 46 may be provided vertically behind the backrest 7b of the driver's seat 7, and the inverter 45 may be provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44.

[0112] (Second Alternative Embodiment of the Invention) 5, inside the cabin 10 (driver's section 9), the inverter 45 may be provided below the left side panel 78. Because the sub-speed change lever 79 and the like are provided on the right side panel 77, it is easy to provide the inverter 45 below the left side panel 78 where the sub-speed change lever 79 and the like are not provided.

[0113] Even if the sub-speed change lever 79 and the like are provided on the right side panel 77, the inverter 45 may be provided below the right side panel 77 if it is possible to provide the inverter 45 below the right side panel 77. In this case, the battery 46 may be located below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be located behind the backrest portion 7b of the driver's seat 7, or may be located below the right or left side panels 77, 78.

[0114] (Third Alternative Embodiment of the Invention) In the second alternative embodiment of the invention, the battery 46 may be provided below the left side panel 78. Because the sub-speed change lever 79 and the like are provided on the right side panel 77, it is easy to provide the battery 46 below the left side panel 78 where the sub-speed change lever 79 and the like are not provided.

[0115] Even if the sub-shift lever 79 and the like are provided on the right side panel 77, the battery 46 may be provided below the right side panel 77 if it is possible to provide the battery 46 below the right side panel 77. In this case, the inverter 45 may be provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be provided behind the backrest portion 7b of the driver's seat 7, or may be provided below the right or left side panels 77, 78.

[0116] (Fourth Alternative Embodiment of the Invention) In the configurations shown in Figures 1 to 4, and in (first alternative embodiment of the invention), (second alternative embodiment of the invention), and (third alternative embodiment of the invention), a duct (not shown) other than duct 84 may be extended from air conditioner 83 and connected to inverter 45 and battery 46, so that a portion of the conditioned air from air conditioner 83 is supplied directly to inverter 45 and battery 46.

[0117] (Fifth Alternative Embodiment of the Invention) In the configurations shown in Figures 1 to 4, and in (First Alternative Embodiment of the Invention) to (Fourth Alternative Embodiment of the Invention), the air conditioner 83 may be provided in the vertical direction behind the backrest portion 7b of the driver's seat 7, or may be provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be provided below the left side panel 78, or may be provided below the right side panel 77.

[0118] (Sixth Alternative Embodiment of the Invention) 6, inside the cabin 10 (drive section 9), the inverter 45 may be provided inside a roof section 56. The inside of the roof section 56 is hollow and has a relatively large volume, making it easy to provide the inverter 45 therein.

[0119] Another duct (not shown) can be branched off from duct 84 inside roof portion 56, and this other duct can be connected to inverter 45. As a result, conditioned air from air conditioner 83 is supplied to the air outlet of roof portion 56 through duct 84, and is then supplied directly to inverter 45 from duct 84 through another duct.

[0120] In this case, the battery 46 may be located below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be located behind the backrest portion 7b of the driver's seat 7, or may be located below the right or left side panels 77, 78. A duct (not shown) separate from duct 84 may extend from air conditioner 83 and connect to battery 46 so as to supply a portion of the conditioned air from air conditioner 83 directly to battery 46 .

[0121] (Seventh Alternative Embodiment of the Invention) In the sixth alternative embodiment of the invention, the battery 46 may be provided inside the roof portion 56. The inside of the roof portion 56 is hollow and has a relatively large volume, making it easy to provide the battery 46 therein.

[0122] Another duct (not shown) can be branched off from duct 84 inside roof portion 56, and this other duct can be connected to battery 46. As a result, conditioned air from air conditioner 83 is supplied to the air outlet of roof portion 56 through duct 84, and is then supplied directly to battery 46 from duct 84 through another duct.

[0123] In this case, the inverter 45 may be provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be provided behind the backrest portion 7b of the driver's seat 7, or may be provided below the right or left side panels 77, 78 (see Figure 5). A duct (not shown) other than the duct 84 may extend from the air conditioner 83 and connect to the inverter 45 so that part of the conditioned air from the air conditioner 83 is supplied directly to the inverter 45 .

[0124] (Eighth Alternative Embodiment of the Invention) 7, air conditioner 83 may be provided inside roof portion 56. According to this configuration, inside roof portion 56, a duct (not shown) extends from air conditioner 83 and is connected to an air outlet of roof portion 56. In this configuration, the duct 84 may extend from the air conditioner 83, pass through the inside of the second support 42, and connect to the inverter 45 and the battery 46, so as to supply a portion of the conditioned air from the air conditioner 83 directly to the inverter 45 and the battery 46.

[0125] (Ninth Alternative Embodiment of the Invention) As shown in (eighth variant of the embodiment of the invention), when air conditioner 83 is provided inside roof portion 56, in addition to the configuration in which a duct (not shown) extends from air conditioner 83 and connects to the air outlet of roof portion 56 inside roof portion 56, the configuration shown below may also be provided.

[0126] 8, right and left ducts 84 extend from the air conditioner 83, pass through the inside of the right and left second support columns 42, and extend downward to connect to the inverter 45 and the battery 46. As a result, conditioned air from the air conditioner 83 is supplied to the air outlet in the roof portion 56, and is supplied through the ducts 84 directly to the inverter 45 and the battery 46.

[0127] In this case, the inverter 45 may be provided below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be provided behind the backrest portion 7b of the driver's seat 7, or may be provided below the right or left side panels 77, 78 (see Figure 5). The battery 46 may be located below the seat portion 7a (support plate 55) of the driver's seat 7 and above the rear floor portion 44, or may be located behind the backrest portion 7b of the driver's seat 7, or may be located below the right or left side panels 77, 78 (see Figure 5).

[0128] (Tenth Alternative Embodiment of the Invention) In the above-described (Sixth Alternative Embodiment of the Invention) to (Ninth Alternative Embodiment of the Invention), if the second support column 42 is thin and it is difficult to provide the duct 84 inside the second support column 42, the duct 84 may be formed along the second support column 42. In such a case, the present invention also refers to the duct 84 being provided passing through the inside of the second support column 42.

[0129] (Eleventh Alternative Embodiment of the Invention) Instead of storing the lubricating oil at the bottom of the clutch housing 11, an oil tank (not shown) (corresponding to a first storage section) may be provided separately from the clutch housing 11 to store the lubricating oil.

[0130] (Twelfth Alternative Embodiment of the Invention) The injection pump 49 may be eliminated, and lubricating oil may be supplied to each part of the first motor-generator 21 and each part of the second motor-generator 22 from the injection nozzle 50.

[0131] (13th Alternative Embodiment of the Invention) The hydraulic pump 15 and the injection pump 49 may be eliminated, and an electric oil pump (not shown) (corresponding to the first pump) may be provided in the paths 53 and 54. According to this configuration, even if the injection pump 49 is not provided, the lubricating oil is supplied from the injection nozzle 50 to each part of the first motor generator 21 and each part of the second motor generator 22 without any difficulty.

[0132] (14th Alternative Embodiment of the Invention) A heat exchanger 60 may be configured to be provided across the path 53 and the path 66 . According to this configuration, the heat exchanger 60 is provided between the oil cooler 48 and the injection pump 49 , and between the radiator 63 and the inverter 45 .

[0133] A heat exchanger 60 may be configured to be provided across the path 54 and the path 67 . According to this configuration, the heat exchanger 60 is provided between the injection pump 49 and the injection nozzle 50 , and between the inverter 45 and the cooling water tank 61 .

[0134] The heat exchanger 60 may be configured to be provided between the paths 51 and 52 and the path 66, or between the paths 51 and 52 and the path 67. The heat exchanger 60 may be configured to be provided between the path 53 and the paths 64 and 65, or between the path 53 and the path 67. The heat exchanger 60 may be configured to be provided between the path 54 and the paths 64 and 65, or between the path 54 and the path 66.

[0135] (15th Alternative Embodiment of the Invention) In the configurations shown in Figures 1 to 4 and in (10th alternative embodiment of the invention) to (13th alternative embodiment of the invention), the cooling water in path 66 may be supplied to battery 46 in addition to being supplied to inverter 45, and may be configured to return from inverter 45 and battery 46 to cooling water tank 61, thereby cooling inverter 45 and battery 46 with the cooling water.

[0136] (16th Alternative Embodiment of the Invention) Instead of providing the first motor generator 21 and the second motor generator 22, a single motor generator (not shown) may be provided in the clutch housing 11. In this configuration, the motor generator may be provided on the transmission shaft 16.

[0137] (17th Alternative Embodiment of the Invention) The engine 5 may be eliminated, and one or more motors (not shown) may be provided instead of the first motor generator 21 and the second motor generator 22, thereby forming an electric tractor. According to this configuration, it is also possible to configure the transmission case 12 so that the planetary gear 18 and the forward / reverse switching device 19 are not provided.

[0138] When a plurality of batteries 46 are provided in the above-described configuration, the batteries 46 may be provided separately inside the cabin 10 (driver's section 9) and inside the hood 6. A duct (not shown) separate from duct 84 may be configured to extend from air conditioner 83 and connect to battery 46 inside hood 6, so that a portion of the conditioned air from air conditioner 83 is directly supplied to battery 46 inside hood 6. [Industrial Applicability]

[0139] The present invention can be applied not only to tractors, but also to work vehicles that carry and transport cargo, work vehicles that tow carts, and construction work vehicles such as wheel loaders, and can also be applied to work vehicles equipped with crawler-type running devices instead of front and rear wheels. [Explanation of symbols]

[0140] 1 aircraft 2 Front wheels (running gear) 3 Rear wheels (running gear) 7 Driver's seat 7a Seat area 7b Backrest 9 Driving Department 10 Cabins 11 Clutch housing (first storage section) 15 Hydraulic pump (first pump) 21 First motor generator (motor) 22 Second motor generator (motor) 42 Second pillar (post) 45 inverter 46 Battery 48 Oil cooler (cooling section) Route 51 (1st supply system) Route 52 (1st supply system) Route 53 (1st supply system) 56 Roof 60 Heat exchanger (cooling section) 61 Cooling water tank (second storage section) 64 Route (Second Supply System) Route 65 (Second Supply System) Route 66 (Second Supply System) 73 Anti-vibration rubber (anti-vibration part) 74 Suspension mechanism (vibration isolation part) 77 Side Panel 78 Side Panel 83 Air Conditioner 84 Duct

Claims

[Claim 1] A running device that supports the machine body; A battery, a cabin supported on the fuselage to accommodate a driver's section provided with a driver's seat; The battery is provided on the roof of the cabin.

Images