Electric dump truck

Abstract

An electric dump truck (1) is provided with: a control panel heat exchanger (13) that is provided in a control panel (12) and that cools an electric component by means of cooling air flowing from an inlet (12C) to an outlet (12D) of the control panel (12); and a blower (14) that sucks air in the control panel (12) from a suction port (14B) connected to the outlet (12D) and discharges the air from the discharge port (14C), thereby causing cooling air to flow in from the inlet (12C) and supplying the cooling air to the control panel heat exchanger (13); a first exhaust duct (16) and a second exhaust duct (17) connected to the discharge port (14C) of the blower (14); an oil cooler (18) for cooling hydraulic oil discharged from a hydraulic pump (7); and a capacitor (21) for cooling refrigerant of an air conditioner. The oil cooler (18) is disposed inside the first exhaust duct (16) so as to be surrounded by the first exhaust duct (16), and the capacitor (21) is disposed inside the second exhaust duct (17) so as to be surrounded by the second exhaust duct (17).

Description

Electric dump truck

[0001] The present invention relates to an electric dump truck that is suitably used for transporting, for example, crushed stone excavated in a mine.

[0002] Extra-large dump trucks known as mining dump trucks are used to transport crushed rock and other materials extracted from mines. These extra-large dump trucks are composed of a body with left and right front wheels and left and right rear wheels attached to a body frame that forms a support structure, and a loading platform provided on the body for loading crushed rock and other materials. Extra-large dump trucks are configured as electric dump trucks that run by driving an electric motor with electricity generated by driving a generator with an engine.

[0003] Furthermore, some electric dump trucks are equipped with a battery that stores excess electricity generated by the engine. This electric dump truck can travel by driving the electric motor with the electricity stored in the battery (Patent Document 1). In electric dump trucks equipped with an engine, other heat exchangers such as an oil cooler that cools hydraulic oil are arranged near the engine together with a radiator to receive cooling air generated by a cooling fan.

[0004] Furthermore, some electric dump trucks are equipped with a trolley device that draws power from overhead lines, and the power drawn by the trolley device is charged into a battery to drive the electric motor. Since these electric dump trucks are not equipped with an engine, they are not equipped with a radiator to cool the engine. On the other hand, electric dump trucks that are not equipped with an engine can freely select the location of other heat exchangers such as an oil cooler.

[0005] JP 2023-119262 A

[0006] In the electric dump truck disclosed in Patent Document 1, the radiator and other heat exchangers are disposed near the engine so as to face the cooling fan, which limits the installation conditions of the other heat exchangers, such as location and orientation, and hinders space saving and improvement of cooling efficiency.

[0007] On the other hand, electric dump trucks that do not have an engine do not have a radiator, so the installation location of other heat exchangers can be freely selected. However, for electric dump trucks that do not have an engine, effective installation conditions for saving space for other heat exchangers and improving cooling efficiency have not yet been proposed.

[0008] An object of one embodiment of the present invention is to provide an electric dump truck that allows the installation location, orientation, and other conditions of the other heat exchangers to be freely set, thereby saving space for the other heat exchangers and improving their cooling efficiency.

[0009] The present invention relates to an electric dump truck comprising a vehicle body, an electric motor provided on the vehicle body and driving a hydraulic pump, a battery provided on the vehicle body and storing power to drive the electric motor, and a control panel that controls the electric motor. The electric dump truck further comprises: a control panel heat exchanger provided within the control panel and cooling electrical components with cooling air flowing from an inlet to an outlet of the control panel; a blower that draws in air from inside the control panel through an intake port connected to the outlet and discharges it from an outlet, thereby causing cooling air to flow into the control panel from the inlet and supply it to the control panel heat exchanger; an exhaust duct connected to the outlet of the blower; and another heat exchanger including an oil cooler that cools hydraulic oil discharged from the hydraulic pump, the other heat exchanger being arranged inside the exhaust duct so as to be surrounded by the exhaust duct.

[0010] According to the present invention, the conditions such as the location and orientation of the other heat exchanger can be freely set, thereby saving space for the other heat exchanger and improving cooling efficiency.

[0011] Fig. 1 is a left side view showing an electric dump truck according to a first embodiment of the present invention. Fig. 2 is a left side view of an electric dump truck from which the left frame, left pillar, building, cab, loading platform, etc. of the body frame are omitted. Fig. 3 is an enlarged view showing a first exhaust duct, an oil cooler, etc. Fig. 4 is a perspective view showing a second exhaust duct according to a second embodiment of the present invention together with an oil cooler. Fig. 5 is an enlarged view showing an exhaust duct, an oil cooler, and a condenser according to a third embodiment of the present invention. Fig. 6 is an enlarged view showing a blower, an exhaust duct, and an oil cooler according to a fourth embodiment of the present invention. Fig. 7 is an enlarged view showing a blower, an exhaust duct, and an oil cooler according to a fifth embodiment of the present invention. Fig. 8 is a left side view of an electric dump truck equipped with an exhaust guide duct according to a sixth embodiment of the present invention, as seen from the same position as in Fig. 2.

[0012] An electric dump truck according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The electric dump truck is equipped with a battery device that stores electric power to drive electric motors for hydraulics and travel. This battery device is charged with electric power drawn from an overhead line using a current collector (trolley system), for example.

[0013] 1 to 3 show a first embodiment of the present invention. In Fig. 1, an electric dump truck 1 is an extra-large dump truck used to transport, for example, crushed rock excavated from a mine. The electric dump truck 1 includes a vehicle body frame 2, front wheels 3, rear wheels 4, a bed 22, a traveling electric motor 5, a hydraulic electric motor 6, a hydraulic pump 7, a battery 11, a control panel 12, a control panel heat exchanger 13, a blower 14, a first exhaust duct 16, a second exhaust duct 17, an oil cooler 18, and a condenser 21, all of which will be described later. The vehicle body frame 2, the front wheels 3, and the rear wheels 4 form the vehicle body of the electric dump truck 1.

[0014] The body frame 2 forms the main skeleton of the electric dump truck 1 and is configured as a strong support structure extending in the front-rear direction. As shown in Figures 1 and 2, the body frame 2 is configured to include a left frame 2A and a right frame 2B extending in the front-rear direction at a predetermined interval in the left-right direction, a left column 2C extending upward from the left frame 2A, a right column 2D extending upward from the right frame 2B, and a beam 2E extending in the left-right direction across the upper parts of the left column 2C and the right column 2D.

[0015] The left and right front wheels 3 constitute steering wheels rotatably mounted on the front side of the body frame 2. On the other hand, the left and right rear wheels 4 (only the left side of each wheel is shown) constitute driving wheels rotatably mounted on the rear side of the body frame 2.

[0016] The electric motors 5 for driving are provided on the left and right rear wheels 4 that constitute the vehicle body. The electric motors 5 for driving drive the left and right rear wheels 4 via reduction gears (not shown). Electric power is supplied to the electric motors 5 for driving from a current collector or a battery 11.

[0017] A hydraulic electric motor 6 serving as an electric motor is provided on the body frame 2 that constitutes the vehicle body. The hydraulic electric motor 6 drives a hydraulic pump 7. Like the traveling electric motor 5, the hydraulic electric motor 6 is supplied with electric power from a current collector or a battery 11.

[0018] The hydraulic pump 7 is connected to the hydraulic electric motor 6. When driven by the hydraulic electric motor 6, the hydraulic pump 7 discharges hydraulic oil as pressurized oil and supplies it to the hoist cylinder 23 and the like via a control valve (not shown).

[0019] The building 8 is provided in front of the body frame 2. The building 8 is formed as a box-shaped container. The building 8 houses a battery 11 and other components. The deck 9 is provided on the upper side of the building 8. The deck 9 is formed in the shape of a flat plate extending horizontally, and is supported from below by the building 8 and a left column 2C and a right column 2D of the body frame 2.

[0020] The cab 10 is provided on the deck 9. The cab 10 defines a cab for an operator to sit in. Inside the cab 10, a driver's seat, a steering wheel, an accelerator pedal, a brake pedal, control levers, switches, etc. (none of which are shown) are provided.

[0021] The battery 11 is located in the building 8 and is provided on the front side of the body frame 2. The battery 11 can store power drawn from a trolley-type overhead line using a current collector, for example. The power stored (charged) in the battery 11 is used to drive the electric motor 5 for travel and the electric motor 6 for hydraulics via a control panel 12 (various electrical components). The battery 11 is composed of, for example, a plurality of battery modules. The battery 11 operates efficiently in an appropriate temperature environment.

[0022] The battery 11 is located between the left pillar 2C and the right pillar 2D of the body frame 2, and is mounted on the left frame 2A and the right frame 2B. A control panel 12 is disposed above the rear position of the battery 11.

[0023] The control panel 12 is provided on a beam 2E of the body frame 2 (on the deck 9). The control panel 12 controls the power supplied to the electric travel motor 5, the electric hydraulic motor 6, etc., in response to the operation of the operator, etc. The housing-shaped control panel 12 contains electrical components (not shown) for performing various controls. Some of the electrical components may rise in temperature due to resistance when current is applied. Therefore, the control panel 12 is provided with a control panel heat exchanger 13, which will be described later.

[0024] Accordingly, the housing-like control panel 12 is provided with a cooling air inlet 12C on the front surface 12A and a cooling air outlet 12D on the rear surface 12B. In the control panel 12, air is sucked out from the outlet 12D on the rear surface 12B by a blower 14 (described later), and outside air is introduced into the control panel 12 from the inlet 12C on the front surface 12A. This introduced outside air is supplied to the control panel heat exchanger 13 as cooling air.

[0025] The control panel heat exchanger 13 is provided inside the control panel 12 (shown by the dotted line in FIG. 2 ). The control panel heat exchanger 13 cools the electric components by, for example, releasing the heat of the coolant flowing through a coolant pipe arranged to surround the electric components into cooling air flowing from an inlet 12C of the control panel 12 to an outlet 12D (shown by the arrow in FIG. 2 ).

[0026] The blower 14 is provided behind the control panel 12 (control panel heat exchanger 13). The blower 14 has an impeller rotated by a motor inside a housing-shaped casing 14A. An intake port 14B is provided on the front surface of the casing 14A, and an exhaust port 14C is provided at the rear of the underside of the casing 14A, opening downward. By rotating the impeller with the motor, the blower 14 draws in air through the intake port 14B and discharges it downward through the exhaust port 14C, as shown by the arrow in FIG. 2 .

[0027] The blower 14 has an intake port 14B connected to an outlet 12D of the control panel 12 via a relay duct 15. This allows the blower 14 to draw air from the inside of the control panel 12 through the intake port 14B and discharge it from the outlet 14C. This allows the blower 14 to introduce cooling air into the control panel 12 from the intake port 12C and supply it to the control panel heat exchanger 13.

[0028] The first exhaust duct 16, which serves as an exhaust duct, is connected to the outlet 14C of the blower 14. Specifically, the first exhaust duct 16 is formed as a rectangular tube that penetrates the upper and lower sides of the casing 14A. The first exhaust duct 16 is disposed below the casing 14A so as to continue to the outlet 14C of the blower 14, and is attached to the underside of the casing 14A. An oil cooler 18, which will be described later, is disposed within the first exhaust duct 16.

[0029] The second exhaust duct 17, which serves as an exhaust duct, is connected to the outlet 14C of the blower 14, continuing from the lower side of the first exhaust duct 16. The second exhaust duct 17 is formed as a rectangular tube similar to the first exhaust duct 16. The second exhaust duct 17 is attached to the lower side of the first exhaust duct 16. A condenser 21, which will be described later, is disposed within the second exhaust duct 17. Because the second exhaust duct 17 is penetrated in the vertical direction, the cooling air that passes through the condenser 21 is discharged downward.

[0030] The oil cooler 18 constitutes another heat exchanger. The oil cooler 18 cools the hydraulic oil discharged from the hydraulic pump 7. Specifically, the oil cooler 18 cools the hydraulic oil returned from the hydraulic actuators such as the hoist cylinder 23 to a hydraulic oil tank (not shown).

[0031] 2 and 3 , the oil cooler 18 is disposed inside the first exhaust duct 16, i.e., inside (midway through) the first exhaust duct 16, so that the cooling air flows vertically. In other words, the first exhaust duct 16 is disposed so as to surround the oil cooler 18. The oil cooler 18 is also disposed upstream of the exhaust port (the outlet in the direction of the cooling air flow) of the first exhaust duct 16. A hose 20 is connected to the oil cooler 18 via a fitting 19. The fitting 19 extends outward from the side surface of the first exhaust duct 16. This allows the hose 20 to be easily connected to the oil cooler 18 simply by attaching the hose 20 to the fitting 19 that protrudes outward.

[0032] The condenser 21 constitutes another heat exchanger. The condenser 21 constitutes part of an air conditioning system that adjusts the temperature inside the cab 10, and releases heat from the refrigerant. The condenser 21 is disposed inside the second exhaust duct 17, i.e., inside (midway through) the second exhaust duct 17, so that the cooling air flows vertically. In other words, the second exhaust duct 17 is disposed so as to surround the condenser 21. The condenser 21 is also disposed upstream of the exhaust port (the outlet in the direction of the cooling air) of the second exhaust duct 17.

[0033] The loading platform 22 is mounted on the body frame 2 so as to be tiltable (raise and lower). The loading platform 22 is formed as a large container with a bottom for carrying, for example, a large amount of mined crushed stone or the like. A rear portion of the bottom of the loading platform 22 in the fore-and-aft direction is connected to the rear of the body frame 2 so as to be tiltable. The loading platform 22 is rotated up and down by extending or retracting the hoist cylinder 23.

[0034] As shown in Fig. 1, the left and right current collectors 24 are attached to the upper sides of a pantograph support 25 installed on the front side of a building 8 (only the left side is shown). The current collectors 24 collect power from overhead lines (not shown) strung over the track (traffic line) of the electric dump truck 1 in a mine or the like, and supply this power to the traveling electric motor 5, the hydraulic electric motor 6, the battery 11, etc. The current collector 24 includes a pantograph 24A that is provided between the pantograph support 25 and the overhead line so as to be able to rise and fall (extend and contract), and a current collector shoe 24B that is provided above the pantograph 24A and slides against the overhead line as the pantograph 24A extends to collect power.

[0035] The electric dump truck 1 according to this embodiment has the configuration as described above. Next, a case where the electric dump truck 1 is used to transport excavated crushed stone or the like will be described.

[0036] First, the operator goes up onto the deck 9 and gets into the cab 10. Once in the cab 10, the operator operates various switches to extend the pantograph 24A of the current collector 24, and brings the current collector shoe 24B into contact with an overhead wire stretched over a track (traffic line) in a mine or the like.

[0037] Once the current collector 24 is brought into contact with the overhead line, the operator operates the steering wheel, accelerator pedal, brake pedal, etc. As a result, the electric motor 5 of the electric dump truck 1 is driven by power from the overhead line, and the electric dump truck 1 travels to, for example, a mining site. Furthermore, if the road includes a road without overhead lines, the electric dump truck 1 is supplied with power from the battery 11 to drive the electric motor 5, and travels to the mining site in the same way as when power is supplied from the overhead line. At this mining site, crushed rock and the like excavated by a hydraulic excavator (not shown) is loaded onto the loading platform 22. Then, once the crushed rock and the like has been loaded onto the loading platform 22, the operator again operates the steering wheel, accelerator pedal, brake pedal, etc. to travel the electric dump truck 1 to a collection site.

[0038] Furthermore, the hydraulic electric motor 6 of the electric dump truck 1 is driven by electric power from the overhead line. As a result, the electric dump truck 1 can unload the loaded crushed stone or the like to a collection site by extending the hoist cylinder 23 using pressurized oil discharged from the hydraulic pump 7 and lifting the loading platform 22.

[0039] When the electric dump truck 1 is in operation, the electrical components of the control panel 12 operate to perform various controls. At this time, some of the electrical components generate heat and are cooled by the control panel heat exchanger 13. In addition, the temperature of the hydraulic oil supplied from the hydraulic pump 7 to the hoist cylinder 23 and other components also rises due to heat of compression, etc., and is cooled by the oil cooler 18. Furthermore, in the cab 10, the air conditioning system is activated to improve the indoor environment. At this time, the condenser 21 releases heat from the refrigerant and cools it.

[0040] The supply of cooling air to the control panel heat exchanger 13, the oil cooler 18, and the condenser 21 will now be described.

[0041] When the electric dump truck 1 is operated, the blower 14 is activated to suck in air from inside the control panel 12. Therefore, in the control panel 12, outside air that flows in from the inlet 12C passes through the control panel heat exchanger 13 as cooling air and flows out from the outlet 12D. This allows the control panel heat exchanger 13 to cool the electrical components inside the control panel 12 through the coolant.

[0042] Next, the blower 14 discharges air downward from the outlet 14C. In this case, the first exhaust duct 16 and the second exhaust duct 17 are arranged vertically in succession below the outlet 14C. Therefore, the air discharged from the blower 14 passes through the oil cooler 18 in the first exhaust duct 16 and the condenser 21 in the second exhaust duct 17, and is discharged from the lower side of the second exhaust duct 17. This allows the oil cooler 18 to cool the hydraulic oil, and the condenser 21 to cool the refrigerant.

[0043] Thus, according to this embodiment, the electric dump truck 1 includes a control panel heat exchanger 13 that is provided in a control panel 12 that controls the traveling electric motor 5 and the hydraulic electric motor 6, and that cools electrical components with cooling air that flows from an inlet 12C of the control panel 12 to an outlet 12D of the control panel 12; a blower 14 that draws in air from the inside of the control panel 12 through an inlet 14B connected to the outlet 12D and discharges it from an outlet 14C, thereby causing cooling air to flow into the control panel 12 from the inlet 12C and supply it to the control panel heat exchanger 13; The hydraulic system includes a first exhaust duct 16 and a second exhaust duct 17 connected to an exhaust port 14C of the hydraulic pump 7, an oil cooler 18 as another heat exchanger for cooling the hydraulic oil discharged from the hydraulic pump 7, and a condenser 21 as another heat exchanger for cooling the refrigerant of the air conditioning system, the oil cooler 18 being arranged inside the first exhaust duct 16 so as to be surrounded by the first exhaust duct 16, and the condenser 21 being arranged inside the second exhaust duct 17 so as to be surrounded by the second exhaust duct 17.

[0044] Therefore, the oil cooler 18 and condenser 21 are not limited to being located near the engine, and conditions such as installation location and orientation can be freely set. As a result, the oil cooler 18 and condenser 21 are placed in the middle of the flow of cooling air supplied to the control panel heat exchanger 13 provided in the control panel 12, so multiple heat exchangers can be combined into one, thereby saving space.

[0045] Furthermore, by reducing the installation space for the oil cooler 18 and the capacitor 21, the installation space for the battery 11 can be increased, so that the operating time of the electric dump truck 1 can be extended.

[0046] In addition, since the oil cooler 18 and the condenser 21 are provided in the first exhaust duct 16 and the second exhaust duct 17 located below the exhaust port 14C of the blower 14, the air discharged from the exhaust port 14C can be actively supplied to the oil cooler 18 and the condenser 21, thereby improving cooling efficiency.

[0047] Furthermore, the exhaust port 14C is provided below the blower 14 and opens downward, and the first exhaust duct 16 and the second exhaust duct 17 are arranged below the blower 14 so as to continue to the exhaust port 14C. This allows the space below the blower 14 to be used as installation space for the first exhaust duct 16, the second exhaust duct 17, the oil cooler 18, and the condenser 21. This also contributes to space savings.

[0048] Next, Fig. 4 shows a second embodiment of the present invention. A feature of this embodiment is that the exhaust duct has an exhaust port that discharges air sideways. In the second embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and their description will be omitted.

[0049] 4, the second exhaust duct 31 according to the second embodiment constitutes an exhaust duct and is provided so as to continue below the first exhaust duct 16. The second exhaust duct 31 is formed as a housing with an open top, with a rectangular cylindrical peripheral surface 31A and a rectangular bottom surface 31B that closes the lower side of the peripheral surface 31A. The second exhaust duct 31 also has a plurality of exhaust ports 31C below the peripheral surface 31A that discharge air laterally. This allows air that has passed through the condenser 21 to be discharged laterally from the plurality of exhaust ports 31C.

[0050] Thus, the second embodiment configured as described above can also achieve the same functions and effects as the first embodiment. In particular, in the second embodiment, the second exhaust duct 31 is provided with an exhaust port 31C that discharges air sideways.

[0051] Therefore, even if wiring, resin piping, electrical components, or other items are arranged below the second exhaust duct 31, this embodiment can prevent air that has been heated by passing through the oil cooler 18 or the condenser 21 from being blown onto these items, thereby improving durability and reliability. Note that, although the horizontally facing exhaust ports 31C are illustrated as multiple round holes in this embodiment, the exhaust ports may have other shapes, such as square holes or elongated holes (slits).

[0052] Next, Fig. 5 shows a third embodiment of the present invention. This embodiment is characterized in that a plurality of heat exchangers are arranged in one exhaust duct.

[0053] 5, an exhaust duct 41 according to the third embodiment is formed as a rectangular tube with a housing that is perforated from top to bottom, similar to the first exhaust duct 16 according to the first embodiment. An oil cooler 42 and a condenser 43, which serve as other heat exchangers, are arranged in the exhaust duct 41 according to the third embodiment so as to be stacked on top of each other in the vertical direction.

[0054] Thus, the third embodiment configured as described above can also achieve the same functions and effects as the first embodiment. In particular, in the third embodiment, the oil cooler 42 and the condenser 43 are arranged in one exhaust duct 41, which further reduces the space required. It is also possible to arrange three or more heat exchangers in one exhaust duct.

[0055] Next, Fig. 6 shows a fourth embodiment of the present invention. This embodiment is characterized in that an exhaust duct is provided above the blower and a heat exchanger is disposed within this exhaust duct.

[0056] 6, the blower 51 according to the fourth embodiment, like the blower 14 according to the first embodiment, has an impeller rotated by a motor inside a housing-like casing 51A, and an intake port 51B is provided on the front surface of the casing 51A. However, the blower 51 according to the fourth embodiment differs from the blower 14 according to the first embodiment in that an exhaust port 51C is provided on the top surface of the casing 51A.

[0057] The exhaust duct 52 is located on the casing 51A of the blower 51 and is connected to the exhaust port 51C. The exhaust duct 52 exhausts air, for example, upward. An oil cooler 53, which is an example of another heat exchanger, is disposed inside the exhaust duct 52.

[0058] Thus, in the fourth embodiment configured as above, it is possible to obtain the same functions and effects as in the first embodiment.

[0059] Next, Fig. 7 shows a fifth embodiment of the present invention. This embodiment is characterized in that an exhaust duct is provided on the left side of the blower, and a heat exchanger is disposed within this exhaust duct.

[0060] 7, the blower 61 according to the fifth embodiment, like the blower 14 according to the first embodiment, has an impeller rotated by a motor inside a housing-like casing 61A, and an intake port 61B is provided on the front surface of the casing 61A. However, the blower 61 according to the fifth embodiment differs from the blower 14 according to the first embodiment in that an exhaust port 61C is provided on the left surface of the casing 61A. The exhaust port can also be provided on the right surface of the casing.

[0061] The exhaust duct 62 is located on the left side of the casing 61A of the blower 61 and is connected to the exhaust port 61C. The exhaust duct 62 exhausts air, for example, to the left side. An oil cooler 63, which is an example of another heat exchanger, is disposed inside the exhaust duct 62.

[0062] Thus, in the fifth embodiment configured as above, it is possible to obtain the same functions and effects as in the first embodiment.

[0063] Next, Fig. 8 shows a sixth embodiment of the present invention. This embodiment is characterized by the provision of an exhaust guide duct that directs air exhausted from the exhaust duct toward the battery. In the sixth embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and their description will be omitted.

[0064] 8, the exhaust guide duct 71 according to the sixth embodiment is attached to the lower side of the second exhaust duct 17. The exhaust guide duct 71 extends downward from the second exhaust duct 17 and curves forward. Therefore, the outlet 71A of the exhaust guide duct 71 is directed toward the battery 11 located in front. This allows the exhaust guide duct 71 to blow air that has been warmed after passing through the control panel heat exchanger 13, oil cooler 18, and condenser 21 toward the battery 11 from the outlet 71A.

[0065] Thus, the sixth embodiment configured as described above can also achieve the same effects and advantages as the first embodiment. In particular, in the sixth embodiment, warm air can be blown toward the battery 11 from the exhaust guide duct 71, so the battery 11 can be maintained at an appropriate temperature even when working in cold regions or in a refrigeration facility. This makes it possible to maintain the performance of the battery 11 even in low-temperature environments.

[0066] DESCRIPTION OF SYMBOLS 1 Electric dump truck 2 Body frame (body) 3 Front wheels (body) 4 Rear wheels 4 (body) 5 Travel electric motor (electric motor) 6 Hydraulic electric motor (electric motor) 7 Hydraulic pump 11 Battery 12 Control panel 12C Inlet 12D Outlet 13 Control panel heat exchanger 14, 51, 61 Blower 14B, 51B, 61B Suction port 14C, 51C, 61C Outlet 16 First exhaust duct (exhaust duct) 17, 31 Second exhaust duct (exhaust duct) 18, 42, 53, 63 Oil cooler (other heat exchanger) 21, 43 Condenser (other heat exchanger) 31C Exhaust port 41, 52, 62 Exhaust duct

Claims

1. The car body and, An electric motor is provided on the vehicle body to drive the hydraulic pump, A battery provided on the vehicle body for storing power to drive the electric motor, A control panel for controlling the aforementioned electric motor, In an electric dump truck equipped with, A control panel heat exchanger is provided within the control panel and cools electrical components by cooling air flowing from the inlet to the outlet of the control panel. A blower that draws air from inside the control panel through an inlet connected to the outlet and discharges it through an outlet, thereby supplying cooling air to the control panel heat exchanger by flowing it into the control panel from the inlet. An exhaust duct connected to the lower side of the blower's outlet so that the air passes through in the vertical direction, and which discharges cooling air from the exhaust port, Other heat exchangers including an oil cooler for cooling the hydraulic fluid discharged from the hydraulic pump, Equipped with, The electric dump truck is characterized in that the other heat exchanger is arranged inside the exhaust duct and surrounded by the exhaust duct.

2. In the electric dump truck according to claim 1, The aforementioned discharge port is provided on the lower side of the blower, opening downwards. The exhaust duct is positioned below the blower so as to be continuous with the exhaust port, and is configured so that cooling air is discharged downward from the exhaust port. An electric dump truck characterized in that a plurality of heat exchangers are arranged within the exhaust duct, as other heat exchangers, so as to surround the exhaust duct.

3. In the electric dump truck according to claim 1, The electric dump truck is characterized in that the exhaust duct is equipped with an exhaust port that discharges air sideways.

4. In the electric dump truck according to Claim 1, The other heat exchanger includes a condenser that cools the refrigerant of the air conditioning system. The exhaust duct includes a first exhaust duct connected to the outlet of the blower, through which cooling air passes and through which the oil cooler is located, and a second exhaust duct arranged vertically and continuously with respect to the first exhaust duct, through which the cooling air that has passed through the first exhaust duct passes and through which the condenser is located. An electric dump truck characterized in that the cooling air that has passed through the second exhaust duct is discharged from the lower side of the second exhaust duct.