Work vehicle

Abstract

To provide a work vehicle capable of efficiently cooling a plurality of devices to be cooled without compressing a narrow device storage space and contributing to cost reduction.SOLUTION: A work vehicle includes a work device that is operated by pressurized oil discharged from a hydraulic pump 66, and an upper rotating body 20 that houses a plurality of devices including the hydraulic pump 66 and an electric motor 62 that drives the hydraulic pump 66 in a device storage space 60 formed therein. The plurality of devices include a plurality of devices to be cooled (an on-board charger 61, the electric motor 62, an inverter 63, an oil cooler 64) and one cooling fan 65 for cooling the plurality of devices to be cooled. The plurality of devices to be cooled are arranged along a cooling air flow path A through which cooling air generated by the cooling fan 65 flows.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Hydraulic excavators are known as working vehicles. A hydraulic excavator is configured to include a lower traveling body having a crawler mechanism or the like, an upper rotating body that is rotatably mounted on the lower traveling body, and a working device that is attached to the upper rotating body and to which an attachment such as a bucket can be attached.

[0003] In recent years, electric work vehicles equipped with an electric motor instead of an engine that drives a hydraulic pump have become widely used, as they have the advantages of not emitting exhaust gases and significantly reducing noise and vibration (see, for example, Patent Document 1).

[0004] Although not shown, the work vehicle described in Patent Document 1 is equipped with a hydraulic pump, an electric motor that drives the hydraulic pump, a cooling fan (first cooling fan) that cools the electric motor, an oil cooler (heat exchanger), and a cooling fan (second cooling fan) that cools the oil cooler inside the upper rotating body.

[0005] In the work vehicle described in Patent Document 1, the first cooling fan is attached to the rotating shaft of the electric motor and rotates as the electric motor rotates. This allows outside air to flow in through the intake port as cooling air to cool the electric motor. Furthermore, as the second cooling fan rotates, outside air flows in through the intake port as cooling air to cool the oil cooler, and the cooling air generated by the second cooling fan is also directed around the electric motor. Therefore, the second cooling fan has the function of cooling not only the oil cooler but also the electric motor.

[0006] According to the work vehicle described in Patent Document 1, even if the cooling capacity of the first cooling fan decreases as the rotation speed of the electric motor decreases during idling, the electric motor can be cooled by the cooling air generated by the second cooling fan, thereby suppressing the decrease in cooling capacity for the electric motor during idling. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5185082 Summary of the Invention [Problem to be solved by the invention]

[0008] There is also a demand for smaller work vehicles depending on the type of work and the conditions at the work site. In such small work vehicles, the space for storing various equipment (hereinafter referred to as the equipment storage space) is necessarily small. Therefore, in addition to the electric motor, inverter, and oil cooler, it is necessary to densely store a hydraulic pump driven by the electric motor, a battery that supplies power to the electric motor, piping for circulating the pressurized oil discharged from the hydraulic pump, and wiring cables for the electrical system in the equipment storage space. Therefore, in small work vehicles, it is important to make effective use of the equipment storage space.

[0009] On the other hand, as described above, the work vehicle described in Patent Document 1 is equipped with two cooling fans: a cooling fan (first cooling fan) that cools the electric motor, and a cooling fan (second cooling fan) that cools the oil cooler. This poses a problem in small work vehicles, as it puts pressure on the narrow equipment storage space. Another problem is that providing two cooling fans leads to increased costs.

[0010] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a work vehicle that can efficiently cool multiple pieces of equipment to be cooled without compressing the narrow equipment storage space, and that can also contribute to cost reduction. [Means for solving the problem]

[0011] [1] The work vehicle of the present invention comprises a work device operated by pressurized oil discharged from a hydraulic pump, and a work vehicle body having an equipment storage space formed therein in which a plurality of devices including the hydraulic pump and an electric motor that drives the hydraulic pump are stored. The plurality of devices include a plurality of devices to be cooled including the electric motor, and one cooling fan for cooling the plurality of devices to be cooled. The plurality of devices to be cooled are arranged along a cooling air flow passage through which cooling air generated by the cooling fan flows.

[0012] [2] In the work vehicle of the present invention, the equipment storage space is a space surrounded by a top cover, a rear cover, a left side cover, a right side cover, and a front cover of the work vehicle body, and it is preferable that the cooling air flow passage is formed between an intake port provided in one of the left side cover and the right side cover and an exhaust port provided in the other side cover.

[0013] [3] In the work vehicle of the present invention, the plurality of devices to be cooled include, in addition to the electric motor, an inverter that controls the electric motor and an oil cooler that cools the pressurized oil. The electric motor, the inverter, and the oil cooler are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage. It is preferable that the cooling fan is arranged between the oil cooler and the inverter and facing the oil cooler.

[0014] [4] In the work vehicle of the present invention, it is preferable that the cooling fan is a cooling fan attached to the oil cooler.

[0015] [5] In the work vehicle of the present invention, a battery pack that supplies power to the electric motor is provided upright between the rear cover and the electric motor and the inverter, and a plate on which the electric motor and the inverter are mounted is provided between the battery pack and the front cover. The plate is located midway in the vertical direction in the equipment storage space. It is preferable that the plate functions as a partition that divides the space surrounded by the top cover, left side cover, right side cover, front cover, and battery pack in the equipment storage space into an upper space and a lower space, with the plate as the boundary.

[0016] [6] In the work vehicle of the present invention, it is preferable that the plate is provided between the battery pack and the front cover so as to form an opening that allows air present in the lower space to flow into the cooling air flow passage.

[0017] [7] In the work vehicle of the present invention, it is preferable that the plurality of cooling target devices further include an on-board charger, and that the on-board charger, the electric motor, the inverter, and the oil cooler are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage. [Effects of the Invention]

[0018] In the work vehicle of the present invention, a plurality of cooling target devices are arranged in a row along a cooling air flow passage through which cooling air generated by a cooling fan flows, and the plurality of cooling target devices are cooled by a single cooling fan. According to the work vehicle of the present invention, since a single cooling fan can cool a plurality of cooling target devices, it is possible to provide a work vehicle that can efficiently cool a plurality of cooling target devices without taking up space in a small equipment storage space and that can also contribute to cost reduction. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an external perspective view of a work vehicle 1 according to an embodiment, as seen obliquely from the rear. [Figure 2] 1 is an external perspective view of a work vehicle 1 according to an embodiment, as seen obliquely from the front. [Figure 3] FIG. 2 is a front view showing the equipment storage space 60 when the work vehicle 1 is viewed from the front. [Figure 4] 2 is a perspective view showing an equipment storage space 60 when the work vehicle 1 is viewed obliquely from the front. FIG. [Figure 5] 10 is a diagram showing a configuration example in which a cooling airflow duct is formed in a cooling airflow passage A. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment shown below, a crawler hydraulic excavator will be described as an example of a work vehicle. First, the external configuration of the work vehicle 1 according to the embodiment will be described with reference to Figs. 1 and 2. Note that the external configuration of the work vehicle 1 according to the embodiment is not the gist of the present invention, so only a general description will be given. Furthermore, in each drawing used to explain the embodiment, components having the same function are given the same reference numerals, and duplicate descriptions may be omitted.

[0021] Furthermore, when it is necessary to indicate the left and right, front and rear, and top and bottom of the work vehicle 1 when explaining the work vehicle 1 according to the embodiment, the side of the work vehicle 1 on which the blade 30 is attached will be referred to as the "front," and the side opposite to the side on which the blade is attached will be referred to as the "rear." Furthermore, the left side of the work vehicle 1 when viewed from behind will be referred to as the "left," and the right side of the work vehicle 1 when viewed from behind will be referred to as the "right." Furthermore, the bottom side of the work vehicle 1 will be referred to as the "bottom," and the side opposite the bottom will be referred to as the "top."

[0022] Here, Fig. 1 is an external perspective view of the work vehicle as seen diagonally from the rear, and Fig. 2 is an external perspective view of the work vehicle as seen diagonally from the front. Figs. 1 and 2 are external perspective views in which the left side of the work vehicle 1 can be seen. Note that the arrows indicating left and right shown in the upper left of Fig. 2 indicate the "left" and "right" of the work vehicle 1 when viewed from the rear. For this reason, the arrows indicating left and right shown in Fig. 2 are opposite to the left and right that appear in Fig. 2.

[0023] As shown in Figures 1 and 2, the work vehicle 1 comprises a lower running body 10, an upper rotating body (work vehicle main body) 20 rotatably mounted on the upper part of the lower running body 10, a blade 30 mounted on the front of the lower running body 10, and a work device 40 mounted on the front of the upper rotating body 20.

[0024] The lower traveling body 10 has a pair of left and right crawlers 12 on both the left and right sides of the traveling body frame 11. A blade 30 that can swing up and down is attached to the traveling body frame 11. A turning mechanism (not shown) is provided at approximately the center of the upper part of the traveling body frame 11, and this turning mechanism enables the upper rotating body 20 to turn on a horizontal plane. The lower traveling body 10, upper rotating body 20, blade 30, and working device 40 are each driven by a corresponding hydraulic actuator (hydraulic motor, hydraulic cylinder, etc.).

[0025] The upper, rear, left, right, and front surfaces of the upper rotating body 20 are covered with covers, respectively, and an equipment storage space 60 (see FIG. 3) is formed inside. Here, the covers covering the upper, rear, left, right, and front surfaces are referred to as an upper cover 21 (see FIG. 2), a rear cover 22 (see FIG. 1), a left side cover 23, a right side cover 24 (see FIG. 1), and a front cover 25 (see FIG. 2). In this way, the equipment storage space 60 is a space surrounded by the upper cover 21, the rear cover 22, the left side cover 23, the right side cover 24, and the front cover 25.

[0026] A canopy-type operator's cab 50 is provided above the top cover 21. The operator's cab 50 is provided with a canopy pole 51, an operator's seat 52, and various operation levers 53. A counterweight 29 that forms part of the rear surface is provided below the rear surface of the upper rotating body 20.

[0027] The top cover 21, rear cover 22, left side cover 23, right side cover 24, and front cover 25 may each be separate bodies, or two or more of these covers may be integrated. In the work vehicle 1 according to this embodiment, the top cover 21 and rear cover 22 are integrated.

[0028] The equipment storage space 60 configured in this manner accommodates not only the various types of equipment necessary to operate the work vehicle 1, but also piping for circulating pressurized oil, wiring for the electrical system, etc. In small work vehicles, the equipment storage space 60 is generally narrow. For this reason, the equipment storage space 60 accommodates a high density of various types of equipment, piping for circulating pressurized oil, wiring for the electrical system, etc.

[0029] Further, an air intake port 26 is provided in the right side cover 24 of the upper rotating body 20 to allow air to flow in as cooling air, and an exhaust port 27 is provided in the left side cover 23 of the upper rotating body 20 to discharge the cooling air. The air intake port 26 provided in the right side cover 24 is located in a position that cannot be seen visually in FIGS. 1 and 2. For this reason, although the air intake port 26 is not shown in FIGS. 1 and 2, it is provided in the right side cover 24 at a position opposite or nearly opposite the exhaust port 27 provided in the left side cover 23. The flow of cooling air between the air intake port 26 and the exhaust port 27 will be described later with reference to FIGS. 3 and 4.

[0030] Fig. 3 is a front view showing the equipment storage space 60 when the work vehicle 1 is viewed from the front. Fig. 4 is a perspective view showing the equipment storage space 60 when the work vehicle 1 is viewed diagonally from the front. The arrows indicating left and right shown in the lower right corners of Figs. 3 and 4 respectively indicate the "left" and "right" of the work vehicle 1 when viewed from the rear. Therefore, as with Fig. 2, the apparent left and right in Figs. 3 and 4 are reversed. That is, the left side of the work vehicle 1 (the side of the left side cover 23 in Fig. 1) is shown on the right side in Figs. 3 and 4, and the right side of the work vehicle 1 (the side of the right side cover 24 in Fig. 1) is shown on the left side in Figs. 3 and 4.

[0031] 3 and 4 are diagrams for explaining the arrangement of a plurality of devices to be cooled (details of which will be described later) among the devices stored in the device storage space 60, a cooling fan 65 for cooling the plurality of devices to be cooled, and a battery pack 70. For this reason, piping for circulating pressure oil, wiring of an electrical system, etc. are not shown.

[0032] As mentioned above, the equipment storage space 60 is a space surrounded by the top cover 21, rear cover 22, left side cover 23, right side cover 24, and front cover 25 of the upper rotating body 20, which serves as the main body of the work vehicle, but these covers are not shown in Fig. 4. Meanwhile, Fig. 3 shows a cross section of a portion of the left side cover 23 and the right side cover 24 out of these covers.

[0033] Here, the multiple cooling target devices in the work vehicle 1 according to this embodiment are an on-board charger 61, an electric motor 62, an inverter 63, and an oil cooler 64. Note that although the on-board charger 61 may not be a cooling target device, in the first embodiment, the on-board charger 61 is also one of the cooling target devices.

[0034] A cooling fan 65 for cooling a plurality of devices to be cooled (an on-board charger 61, an electric motor 62, an inverter 63, and an oil cooler 64) is provided in the device storage space 60. The devices to be cooled are arranged along a cooling air flow path through which the cooling air generated by the cooling fan 65 flows.

[0035] 3, the cooling air flow path is indicated by a single dashed arrow A that linearly connects the intake port 26 provided in the right side cover 24 and the exhaust port 27 provided in the left side cover 23. However, this dashed arrow A is merely a convenient illustration of the cooling air flow path through which the cooling air flows, and does not represent the actual flow of the cooling air. In the following description, the dashed arrow A will be referred to as the cooling air flow path A.

[0036] The on-board charger 61, electric motor 62, inverter 63, and oil cooler 64 are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage A. The cooling fan 65 is arranged between the oil cooler 64 and the inverter 63 and facing the oil cooler 64. In the work vehicle 1 according to this embodiment, the cooling fan 65 is attached to the oil cooler 64. For this reason, in FIG. 3 , the cooling fan 65 is shown as being integrated with the oil cooler 64.

[0037] Here, the top cover 21, rear cover 22, and front cover 25 shown in Figures 1 and 2 are not shown in Figures 3 and 4. Here, the relationship between these covers and the devices to be cooled (on-board charger 61, electric motor 62, inverter 63, cooling fan 65, oil cooler 64) and battery pack 70 shown in Figures 3 and 4 will be described. Note that the battery pack 70 has the function of supplying power to the electric motor 62, and houses a secondary battery such as a lithium-ion battery, electrical circuit components, and the like inside.

[0038] The top cover 21 is provided above the on-board charger 61, the electric motor 62, the inverter 63, the cooling fan 65, the oil cooler 64, and the battery pack 70. The rear cover 23 is provided behind the battery pack 70. The battery pack 70 is provided upright between the rear cover 22 (see FIG. 1 ) and the electric motor 62 and the inverter 63. The front cover 25 is provided in front of the on-board charger 61, the electric motor 62, the inverter 63, the cooling fan 65, and the oil cooler 64. A plate 91 is provided between the battery pack 70 and the front cover 25, on which the electric motor 62 and the inverter 63 are mounted. In the description of the embodiment, the plate 91 will be referred to as a "horizontal plate 91." The horizontal plate 91 is provided as part of a bracket 90, which will be described later, and the configurations of the horizontal plate 91 and the bracket 90 will be described later.

[0039] When the cooling fan 65 is operated with multiple devices to be cooled (on-board charger 61, electric motor 62, inverter 63, and oil cooler 64) arranged along cooling air flow path A as shown in Fig. 3, air flows in as cooling air from intake port 26 provided in right side cover 24 shown on the left side in Fig. 3. The cooling air that flows in from intake port 26 flows along cooling air flow path A, and then is discharged from exhaust port 27 of left side cover 23 shown on the right side in Fig. 3.

[0040] 3, the multiple devices to be cooled (on-board charger 61, electric motor 62, inverter 63, oil cooler 64) are shown as if they were arranged between air intake 26 and exhaust outlet 27 on a straight line connecting air intake 26 and exhaust outlet 27. However, the multiple devices to be cooled do not necessarily have to be arranged on a straight line connecting air intake 26 and exhaust outlet 27. For example, the entire surfaces of air intake 26 and on-board charger 61 do not have to face each other. In other words, air intake 26 may be provided at a position slightly offset from on-board charger 61. That is, it is sufficient that the multiple devices to be cooled are arranged in a row along cooling air flow path A through which cooling air generated by cooling fan 65 flows.

[0041] Incidentally, brackets for attaching various devices are present inside the equipment storage space 60. For example, there is a bracket 81 (referred to as the first bracket 81) for attaching the on-board charger 61, a bracket 82 (referred to as the second bracket 82) for attaching the oil cooler 64, and a bracket 90 (referred to as the third bracket 90) for attaching the electric motor 62 and the inverter 63. These brackets 81, 82, and 90 are provided on the frame 28 (referred to as the main frame 28) of the upper rotating body 20.

[0042] 4, the third bracket 90 for mounting the electric motor 62 and the inverter 63 is integrally formed with a horizontal plate 91 extending forward, a horizontal plate 92 (referred to as an auxiliary horizontal plate 92) extending rearward, and a vertical plate 93 interposed between the horizontal plate 91 and the auxiliary horizontal plate 92. The electric motor 62 and the inverter 63 are mounted on the horizontal plate 91 and mounted thereon.

[0043] 4, the auxiliary horizontal plate 92 is provided so as to fit along at least a portion of the upper surface of the battery pack 70. The vertical plate 93 is provided so as to fit along at least a portion of the front surface of the battery pack 70. Here, the front surface of the battery pack 70 refers to the surface of the battery pack 70 that faces the electric motor 62 and the inverter 63. It is preferable that the auxiliary horizontal plate 92 and the vertical plate 93 do not come into contact with the battery pack 70.

[0044] 4, openings 94 are formed in the auxiliary horizontal plate 92 and vertical plate 93 so that parts of the upper and front surfaces of the battery pack 70 are exposed. By forming these openings 94 in the auxiliary horizontal plate 92 and vertical plate 93 of the third bracket 90, the cooling air flowing through the cooling air flow path A also hits the battery pack 70. This provides the advantage that the cooling air from the cooling fan 65 can also be used to cool the battery pack 70.

[0045] Here, the horizontal plate 91 will be further described. The horizontal plate 91 is located in the vertical midpoint of the equipment storage space 60 (which can also be said to be the vertical midpoint of the battery pack 70). The horizontal plate 91 functions as a partition plate that separates the space surrounded by the top cover 21, left side cover 23, right side cover 24, front cover 25, and battery pack 70, into an upper space 60a and a lower space 60b. The electric motor 62 and the inverter 63 are located in the upper space 60a above the horizontal plate 91. In the upper space 60a, the space surrounded by the horizontal plate 91, top cover 21, front cover 25, and battery pack 70 (upper space 60a) forms part of the cooling airflow passage A (see FIG. 3).

[0046] The horizontal plate 91 is configured to have an opening that allows air present in the lower space 60b to flow into the cooling air flow passage A. Specifically, one end 91a of the horizontal plate 91 (the end on the cooling fan 65 side) is not in contact with the cooling fan 65, and an opening 101 is formed between the end 91a and the cooling fan 65. The other end 91b of the horizontal plate 91 (the end on the on-board charger 61 side) is not in contact with the on-board charger 61, and an opening 102 is formed between the end 91a and the on-board charger 61.

[0047] In the work vehicle 1 according to this embodiment, the electric motor 62 is attached to the horizontal plate 91 so that the rotating shaft 621 (see FIG. 3) is oriented in the vertical direction. The rotating shaft 621 of the electric motor 62 penetrates the horizontal plate 91 and extends downward from the horizontal plate 91, and a plurality of hydraulic pumps 66 are connected in series to the rotating shaft 621 that extends downward. For this reason, the horizontal plate 91 is provided with a through-hole (not shown) through which the rotating shaft 621 of the electric motor 62 passes. Similar to the openings 101 and 102 described above, this through-hole also functions to allow air present in the lower space 60b to flow into the cooling air flow passage A.

[0048] In the work vehicle 1 according to the embodiment, a case is shown in which multiple openings are formed to allow the air present in the lower space 60b to flow into the cooling air flow passage A. However, all of the above-mentioned openings are not required, and it is sufficient if the air present in the lower space 60b can be properly allowed to flow into the cooling air flow passage A.

[0049] The plurality of hydraulic pumps 66 attached to the rotary shaft 621 of the electric motor 62 discharge pressure oil for operating the undercarriage 10, the upper rotating body 20, the blade 30, the excavator 40, etc. The pressure oil discharged from each of the plurality of hydraulic pumps 66 is supplied to a corresponding hydraulic actuator (hydraulic motor, hydraulic cylinder, etc.). The point of operating the hydraulic actuator with the pressure oil discharged from each of the plurality of hydraulic pumps 66 will not be described here as it is outside the scope of the present invention.

[0050] The above has described the arrangement of the multiple devices to be cooled (on-board charger 61, electric motor 62, inverter 63, and oil cooler 64) and cooling fan 65. By arranging the multiple devices to be cooled and cooling fan 65 in this manner, it is possible to efficiently cool the multiple devices to be cooled (on-board charger 61, electric motor 62, inverter 63, and oil cooler 64) with one cooling fan 65.

[0051] That is, when the cooling fan 65 is operated, air that flows in through the intake port 26 (see FIG. 3), i.e., cooling air, flows along the cooling air flow path A and is discharged from the exhaust port 27. At this time, the cooling air flows along the outer peripheral surface of the on-board charger 61, and then flows along the outer peripheral surface of the electric motor 62. The cooling air then further flows along the outer peripheral surface of the inverter 63, passes through the oil cooler 64, and is discharged from the exhaust port 27 (see FIG. 3).

[0052] The cooling air circulating in this manner can cool the on-board charger 61, the electric motor 62, the inverter 63, and the oil cooler 64. Note that the cooling fan 65 is attached to the oil cooler 64, and therefore the cooling air generated by the cooling fan 65 directly hits the oil cooler 64.

[0053] Here, the electric motor 62 is disposed upstream of the cooling air in the cooling air flow passage A. The reason for this arrangement is that the electric motor 62 is a device that generates a lot of heat, and therefore, a greater cooling effect can be obtained by disposing it upstream of the cooling air. Note that, in the work vehicle 1 according to this embodiment, the on-board charger 61 is shown as being disposed further upstream of the cooling air than the electric motor 62. One reason for this is that, when connecting a charging cable from an external power source to the on-board charger 61, it is convenient to install the on-board charger 61 in a position close to the openable cover (right side cover 24).

[0054] The space (upper space 60a) surrounded by the horizontal plate 91, top cover 21, front cover 25, and battery pack 70 is not an airtight space, but as described above, it forms part of the cooling air flow path A (see FIG. 3). In this case, the horizontal plate 91, top cover 21, front cover 25, and battery pack 70 serve to guide the cooling air flowing through the electric motor 62 and inverter 63. This prevents the cooling air flowing through the electric motor 62 and inverter 63 from diffusing over a wide area. This allows the electric motor 62 and inverter 63, which tend to generate high heat, to be efficiently cooled.

[0055] As described above, the horizontal plate 91 is configured to have openings that allow air present in the lower space 60b to flow into the cooling air flow passage A. This allows relatively low-temperature air present in the lower space 60b to flow into the cooling air flow passage A. This prevents the temperature of the cooling air flowing through the cooling air flow passage A from rising too high.

[0056] That is, the cooling air flowing through the cooling air flow passage A may have a high temperature due to heat generated by the electric motor 62, the inverter 63, etc. In contrast, the air present in the lower space 60b often maintains a lower temperature than the high-temperature cooling air flowing through the cooling air flow passage A. Therefore, the air present in the lower space 60b flows into the cooling air flow passage A, thereby lowering the temperature of the high-temperature cooling air. This further improves the cooling effect on the electric motor 62, the inverter 63, and the oil cooler 64.

[0057] As described above, in the work vehicle 1 according to this embodiment, a plurality of devices to be cooled (on-board charger 61, electric motor 62, inverter 63, oil cooler 64) are arranged in a row along the cooling air flow passage A through which the cooling air flows. The plurality of devices to be cooled are then cooled by a single cooling fan 65. In this way, with the work vehicle 1 according to this embodiment, it is possible to cool a plurality of devices to be cooled with a single cooling fan 65, which makes it possible to efficiently cool a plurality of devices to be cooled without taking up space in a small equipment storage space and also contributes to cost reduction.

[0058] Furthermore, in the work vehicle 1 according to this embodiment, the cooling fan 65 is attached to the oil cooler 64 and has a structure that is integrated with the oil cooler 64. Therefore, there is no need to prepare a separate cooling fan 65, and there is no need to secure a dedicated installation space for installing the cooling fan 65, which contributes to space savings.

[0059] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, modifications such as those shown below are also possible.

[0060] (1) In the above-described embodiment, the on-board charger 61 is one of the devices to be cooled. However, there are also work vehicles that do not have an on-board charger 61. Even if an on-board charger is present, depending on the installation location of the on-board charger, the on-board charger may not need to be a device to be cooled. In such cases, the electric motor 62, inverter 63, and oil cooler 64 may be the devices to be cooled. In this case, the electric motor 62, inverter 63, and oil cooler 64 are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage: electric motor 62, inverter 63, cooling fan 65, and oil cooler 64.

[0061] (2) In the above-described embodiment, the cooling fan 65 is a cooling fan attached to the oil cooler 64. However, this is not limiting, and the cooling fan 65 may be provided separately from the oil cooler 64. Even in this case, a single cooling fan 65 can cool multiple devices to be cooled.

[0062] (3) In the above-described embodiment, a work vehicle that travels using crawlers 12 has been exemplified. However, the present invention is not limited to work vehicles that travel using crawlers, and may be a work vehicle that travels using tires as long as it is a work vehicle that uses an electric motor instead of an engine. Furthermore, while a hydraulic excavator has been exemplified as a work vehicle, the present invention is not limited to this, and can be similarly applied to other work vehicles, such as a skid steer loader, as long as it is a work vehicle that uses an electric motor instead of an engine.

[0063] (4) A cooling air duct that actively guides the flow of cooling air may be formed in the cooling air flow passage A. For example, as shown in Fig. 5, one example is to prepare an enclosure member 121 whose end face is L-shaped, and combine this enclosure member 121 with the horizontal plate 91 and vertical plate 93 of the already installed third bracket 90 to form a cooling air duct 120 that surrounds the electric motor 62 and the inverter 63 along the cooling air flow passage A (see Fig. 3).

[0064] By forming such a cooling air duct 120, the cooling air flowing in from the air intake 26 (see FIG. 3) flows into the cooling air duct 120 and cools the electric motor 62 and the inverter 63 present inside the cooling air duct 120. This allows the cooling air to be applied efficiently to the electric motor 62 and the inverter 63, further enhancing the cooling effect. Such a cooling air duct 120 may be a cooling air duct that not only surrounds the electric motor 62 and the inverter 63, but also surrounds all of the multiple devices to be cooled, including the electric motor 62 and the inverter 63.

[0065] Even when forming such a cooling air flow duct 120, it is preferable to provide an opening (not shown) in the cooling air flow duct 120 that allows air present outside the cooling air flow duct 120 to flow into the cooling air flow duct 120. This prevents a decrease in the cooling effect on the inverter 63 and the oil cooler 64, even if the cooling air becomes hot due to heat emitted by the electric motor 62, as the air present outside the duct flows into the duct. Note that the cooling air flow duct 120 is not limited to the configuration shown in FIG. 5, and various configurations can be used. [Explanation of symbols]

[0066] 1. Work vehicle, 20. Upper rotating body (work vehicle body), 21. Top cover, 22. Rear cover, 23. Left side cover, 24. Right side cover, 25. Front cover, 26. Air intake port, 27. Exhaust port, 40. Work device, 60. Equipment storage space, 60a. Upper space, 60b. Lower space, 61. On-board charger, 62. Electric motor, 63. Inverter, 64. Oil cooler, 65. Cooling fan, 66. Hydraulic pump, 70. Battery pack, 91. Horizontal plate (plate), 101, 102. Openings that allow air present in the lower space 60b to flow into the cooling air flow passage A, A. Cooling air flow passage

Claims

1. A work vehicle comprising: a work device operated by pressurized oil discharged from a hydraulic pump; and a work vehicle body having an equipment storage space formed therein in which a plurality of devices including the hydraulic pump and an electric motor that drives the hydraulic pump are stored, the plurality of devices include a plurality of devices to be cooled including the electric motor, and one cooling fan for cooling the plurality of devices to be cooled, The plurality of devices to be cooled are arranged along a cooling air flow passage through which cooling air generated by the cooling fan flows.

2. The work vehicle according to claim 1, the equipment storage space is a space surrounded by a top cover, a rear cover, a left side cover, a right side cover, and a front cover of the work vehicle body, a cooling air flow passage formed between an intake port provided in one of the left side cover and the right side cover and an exhaust port provided in the other side cover.

3. The work vehicle according to claim 2, the plurality of devices to be cooled include, in addition to the electric motor, an inverter that controls the electric motor, and an oil cooler that cools the pressurized oil, the electric motor, the inverter, and the oil cooler are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage, and the cooling fan is arranged between the oil cooler and the inverter and opposite the oil cooler.

4. The work vehicle according to claim 3, The work vehicle is characterized in that the cooling fan is a cooling fan attached to the oil cooler.

5. The work vehicle according to claim 3, a battery pack that supplies power to the electric motor is provided upright between the rear cover and the electric motor and the inverter, and a plate on which the electric motor and the inverter are mounted is provided between the battery pack and the front cover; The plate is located midway up and down in the equipment storage space, and functions as a partition that separates the space of the equipment storage space surrounded by the top cover, the left side cover, the right side cover, the front cover, and the battery pack into an upper space and a lower space, with the plate as the boundary.

6. The work vehicle according to claim 5, the plate is provided between the battery pack and the front cover so as to form an opening through which air present in the lower space can flow into the cooling air flow passage.

7. The work vehicle according to claim 3, the plurality of cooling target devices further includes an on-board charger, and the on-board charger, the electric motor, the inverter, and the oil cooler are arranged in this order from the upstream side of the cooling air flowing through the cooling air flow passage.

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