Industrial vehicles

Abstract

To provide an industrial vehicle which enables improvement of cooling efficiency of a heating element.SOLUTION: In a forklift 10, a battery 40 is disposed rearward of a cabin 28 at a rear part of a vehicle body 21. A motor control device 33 is disposed forward of the battery 40. A driving motor 30 and a cargo handling motor 32 are disposed forward of a cooling fan 50. The cooling fan 50 exhausts travel wind flowing from the front of the vehicle body 21 to the rear to areas located rearward of the driving motor 30 and the cargo handling motor 32.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an industrial vehicle. [Background technology]

[0002] Patent Document 1 discloses a battery-powered forklift. The battery-powered forklift in Patent Document 1 has a vehicle body, a traveling motor, a cargo-handling motor, a battery, and a control device that controls the traveling motor and the cargo-handling motor. The vehicle body is provided with a storage space. The storage space houses the cargo-handling motor and the control device, which are examples of heat-generating elements. The battery-powered forklift also has a fan that exhausts air from the storage space to the outside. The fan is located on the side of the vehicle body. The air from the storage space is exhausted to the outside of the vehicle body by the fan. Accordingly, heat generated in the cargo-handling motor and the control device is exhausted to the outside of the vehicle body. As a result, excessive temperature rise in the storage space is suppressed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 109000 Summary of the Invention [Problem to be solved by the invention]

[0004] For industrial vehicles that house a heat generating element inside, such as the battery-powered forklift disclosed in Patent Document 1, it is desirable to improve the cooling efficiency of the heat generating element. [Means for solving the problem]

[0005] The industrial vehicle for solving the above problems has a vehicle body into which traveling wind is introduced from the front, a driving wheel disposed at the front of the vehicle body; a steering wheel disposed at the rear of the vehicle body; the vehicle body Installed upright from the top surface of a loading device installed in the front of the vehicle body; and a loading device installed inside the vehicle body below the cabin. , driving the loading and unloading device a cargo handling motor, and a motor installed inside the vehicle body below the cabin. , driving the drive wheels a travel motor; a motor control device that is installed inside the vehicle body below the cabin and that controls the cargo handling motor and the travel motor; and a battery that serves as a power source for the cargo handling motor and the travel motor. a counterweight disposed inside the vehicle body above the steering wheel; a cooling fan installed inside the vehicle body, the counterweight has a weight body, a heat transfer member is arranged on the upper surface of the weight body, a duct is defined between the weight body and the heat transfer member by the upper surface of the weight body being recessed from the front end to the rear end of the weight body, the cooling fan is arranged inside the duct, a storage space is defined inside the vehicle body extending from the front end of the vehicle body to the cooling fan, and the travel motor and the cargo handling motor are housed in the storage space, The battery A member is placed on the upper surface of the heat transfer member. , the motor control device It is fixed to the upper part of the vehicle body so as to face the storage space. The cooling fan is configured to circulate the airflow from the front to the rear of the vehicle body. the outside of the vehicle body through the duct The gist of this is to exhaust the air.

[0006] The travel motor, the cargo handling motor, and the motor control device are each heat-generating elements that generate heat when driven. That is, the travel motor, the cargo handling motor, and the motor control device are each heat-generating elements located inside the vehicle body below the cabin. When the industrial vehicle travels, traveling wind is introduced into the vehicle body from the front and flows inside the vehicle body from front to rear below the cabin. The cooling fan exhausts the traveling wind to the rear of the cargo handling motor and the travel motor. Therefore, the traveling wind flowing inside the vehicle body is drawn in by the cooling fan without changing its flow direction. As a result, the wind speed of the traveling wind can be increased compared to when there is no cooling fan or when the flow direction of the traveling wind is changed. When the traveling wind with increased wind speed comes into contact with the heat-generating elements located inside the vehicle body, the cooling efficiency of the heat-generating elements can be improved.

[0007] The industrial vehicle may have at least one of an inlet straightening plate that protrudes forward from the front end of the vehicle body and introduces the traveling wind into the interior of the vehicle body, and a guide straightening plate that is positioned inside the vehicle body below the cabin and directs the traveling wind toward the cooling fan.

[0008] This allows a greater amount of wind to be introduced into the vehicle body than when there is no introduction rectifier. Also, inside the vehicle body, the amount of wind directed toward the cooling fan is greater than when there is no guide rectifier. Therefore, by using at least one of the introduction rectifier and the guide rectifier, the cooling efficiency of the heat-generating body can be improved compared to when the heat-generating body is cooled by the introduction rectifier alone.

[0009] About industrial vehicles ,before The storage space has an undercover that covers it from below. The undercover may have an inclined portion located between the front end of the vehicle body and the cooling fan, and the inclined portion may be inclined upward from the front to the rear toward the cooling fan. .

[0010] With this, the undercover prevents the wind from diffusing downward from the vehicle body when the vehicle is traveling through the storage space, thereby preventing a decrease in the volume of the wind caused by the diffusion of the wind.

[0012] This allows the inclined portion to easily direct the wind as the vehicle travels toward the cooling fan. In an industrial vehicle, the motor control device may have a control unit that controls the loading motor and the traveling motor, and a fan for cooling the control unit, and the fan may face the storage space.

[0013] With this, heat generated in the control unit is discharged into the storage space by the fan. The heat discharged into the storage space is then discharged to the outside of the vehicle body by the wind generated by running. Therefore, the cooling efficiency of the control unit can be improved compared to when the fan does not face the storage space. [Effects of the Invention]

[0014] According to the present invention, the cooling efficiency of the heat generating element can be improved. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view showing a forklift according to an embodiment. [Figure 2] FIG. 1 is a cross-sectional view schematically showing a forklift. [Figure 3] FIG. 2 is a partial cross-sectional plan view schematically showing the interior of the forklift. [Figure 4] FIG. 1 is a front view schematically showing a forklift. [Figure 5] FIG. 2 is a partial perspective view schematically showing a storage space and a cooling fan. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment in which the industrial vehicle is a forklift will be described below with reference to Figures 1 to 5. In the following description, the terms "front," "rear," "left," "right," "up," and "down" refer to the state in which the operator operating the forklift is facing forward (in the forward direction) of the vehicle.

[0017] <Overall forklift> 1 and 2, a forklift 10 as an industrial vehicle has a vehicle body 11, drive wheels 12, steering wheels 13, and a cargo handling device 14. The forklift 10 also has a travel motor 30 that drives the drive wheels 12, a power transmission device 31, a cargo handling motor 32 that drives the cargo handling device 14, and a motor control device 33 that controls the travel motor 30 and the cargo handling motor 32. The forklift 10 has a battery 40 as a power source for the travel motor 30 and the cargo handling motor 32.

[0018] <Body> The vehicle body 11 has a vehicle main body 21 and a cabin 28 serving as a driver's cab installed in the vehicle main body 21. The front-rear direction is the front-rear direction of the vehicle body 11, and the left-right direction is the vehicle width direction of the vehicle body 11.

[0019] As shown in Figures 2 and 3, the vehicle body 21 has a first bottom portion 22a and a second bottom portion 22b, a pair of side portions 23, a front partition plate 24, and a counterweight 25. The pair of side portions 23 are separated in the left-right direction. The pair of side portions 23 are disposed in front of the counterweight 25. The first bottom portion 22a and the second bottom portion 22b each span across the lower portions of the pair of side portions 23. The front partition plate 24 spans across the front portions of the pair of side portions 23. The front partition plate 24 forms a part of the front end of the vehicle body 21. The front partition plate 24 is disposed in front of and above the first bottom portion 22a.

[0020] The first bottom 22a and the second bottom 22b are spaced apart in the front-to-rear direction. The first bottom 22a is spaced rearward from the front end of the vehicle body 21. The second bottom 22b is spaced rearward from the rear end of the first bottom 22a. The second bottom 22b is located forward of the front end of the counterweight 25. The first bottom 22a is located lower than the second bottom 22b. Therefore, the second bottom 22b is located higher than the first bottom 22a.

[0021] 4, a power transmission device 31 is disposed below the front partition plate 24. A gap S is provided between the front partition plate 24 and the power transmission device 31 in the vertical direction.

[0022] <Traction motors, cargo handling motors, motor control devices> As shown in Figures 2, 3 and 5, the travel motors 30 are fixed to the upper surface of the first bottom portion 22a. Two travel motors 30 are fixed to the first bottom portion 22a, but the number of travel motors 30 may be changed as appropriate. The two travel motors 30 are lined up in the left-right direction. The cargo handling motor 32 is fixed to the upper surface of the second bottom portion 22b. Two cargo handling motors 32 are fixed to the second bottom portion 22b, but the number of cargo handling motors 32 may be changed as appropriate. The two cargo handling motors 32 are lined up in the left-right direction.

[0023] The motor control device 33 has a control unit 34 that controls the driving of the travel motor 30 and the cargo handling motor 32, and a fan 35 for cooling the control unit 34. The control unit 34 is disposed above the fan 35. The fan 35 has a frame-shaped case 36 and blade members 37 housed in the case 36. The case 36 is open in the vertical direction. That is, the case 36 opens toward the control unit 34 and also opens downward. The fan 35 blows air downward from the case 36 by rotating the blade members 37. Furthermore, the fan 35 discharges heat generated in the control unit 34 downward by rotating the blade members 37.

[0024] The motor control device 33 is fixed to the upper part of the vehicle body 21 by a bracket (not shown). The motor control device 33 is disposed above the cargo handling motor 32. The fan 35 is spaced above the cargo handling motor 32.

[0025] <Storage space> The first bottom portion 22a, the second bottom portion 22b, the pair of side portions 23, the front partition plate 24, and the counterweight 25 define a storage space 27 inside the vehicle body 21. The storage space 27 is a space extending in the fore-and-aft direction of the vehicle body 11. Therefore, the travel motor 30 fixed to the upper surface of the first bottom portion 22a and the cargo handling motor 32 fixed to the upper surface of the second bottom portion 22b are each stored in the storage space 27. In addition, the fan 35 of the motor control device 33 faces the storage space 27.

[0026] The storage space 27 communicates with the outside of the vehicle body 11 through a gap S defined at the front end of the vehicle body 21. Therefore, it can be said that the storage space 27 is open at the front end of the vehicle body 21. When the forklift 10 travels, wind generated by the travel is introduced into the storage space 27, which is inside the vehicle body 21, through the gap S. In other words, wind generated by the travel is introduced into the vehicle body 21 from the front of the vehicle body 21.

[0027] The traveling wind introduced into the storage space 27 flows through the storage space 27 and comes into contact with the traveling motor 30 and the cargo handling motor 32. As a result, heat generated in the traveling motor 30 and the cargo handling motor 32 is discharged into the traveling wind, thereby cooling the traveling motor 30 and the cargo handling motor 32. In addition, heat generated in the control unit 34 is discharged by the fan 35 into the traveling wind flowing through the storage space 27. As a result, the control unit 34 of the motor control device 33 is cooled.

[0028] <Loading equipment> As shown in FIG. 1, the cargo handling device 14 is installed at the front of the vehicle body 21. The cargo handling device 14 has a mast 15 erected at the front of the vehicle body 21, a pair of forks 16 that are capable of rising and falling together with the mast 15, and a lift cylinder 17 that raises and lowers the mast 15. A load is placed on the forks 16. The lift cylinder 17 is a hydraulic cylinder. When the mast 15 is raised and lowered by the extension and contraction of the lift cylinder 17, the forks 16 are raised and lowered accordingly. The cargo handling device 14 is driven by a cargo handling motor 32.

[0029] <Counterweight> 2, 3, and 5, the counterweight 25 is a weight for balancing when the cargo handling device 14 is loaded with cargo. The counterweight 25 is disposed above the steering wheel 13. The counterweight 25 has a weight body 251 and a weight cover 252.

[0030] The weight main body 251 defines a duct forming portion 26 extending in the front-rear direction. The duct forming portion 26 is recessed from the top surface of the weight main body 251. The duct forming portion 26 is defined between both left-right side portions of the weight main body 251. The duct forming portion 26 extends in the front-rear direction of the weight main body 251 and has a width in the left-right direction. The duct forming portion 26 opens to the rear end surface of the vehicle main body 21. The duct forming portion 26 communicates with the rear end of the storage space 27. Therefore, the running wind that flows through the storage space 27 flows into the duct forming portion 26. The duct forming portion 26 communicates with the outside of the vehicle body 11 via the storage space 27.

[0031] The forklift 10 may have a heat transfer member 39. The heat transfer member 39 is disposed on the upper surface of the weight body 251. The heat transfer member 39 is in contact with the upper surface of the weight body 251. The heat transfer member 39 is made of a metal plate.

[0032] <Battery> The battery 40 is placed on the upper surface of the heat transfer member 39. As described above, the counterweight 25 is disposed at the rear of the vehicle body 21. The battery 40 disposed on the upper surface of the counterweight 25 can be said to be disposed at the rear of the vehicle body 21.

[0033] The battery 40 is in contact with the heat transfer member 39. The heat transfer member 39 transfers heat generated in the battery 40 to the weight body 251. For this reason, the heat transfer member 39 is preferably made of a metal with high thermal conductivity. The weight cover 252 covers the battery 40 from above.

[0034] The duct forming portion 26 is covered from above by a heat transfer member 39. The duct 38 is defined by the duct forming portion 26 of the weight main body 251 and the heat transfer member 39. Therefore, it can be said that the duct 38 is a space that is closed in all directions. However, due to the configuration of the counterweight 25, the vehicle body 21, and the heat transfer member 39, a small gap that communicates with the outside is provided in the duct 38. The duct 38 communicates with the storage space 27 and opens to the outside of the vehicle body 11 at the rear end surface of the vehicle body 11. Therefore, the running wind introduced into the storage space 27 flows through the duct 38 and is discharged to the outside of the vehicle body 11.

[0035] <Cabin> As shown in FIGS. 1 and 2, the cabin 28 has a top plate 28a, a pair of side frames 28b, a bottom plate 28c, and a seat base 28d. The cabin 28 stands upright from the upper surface of the vehicle body 21. Although only one side frame 28b is shown, the pair of side frames 28b are arranged on both left and right sides of the vehicle body 21. The bottom plate 28c is arranged on the upper surface of the vehicle body 21. The storage space 27 is covered from above by the bottom plate 28c of the cabin 28. The seat base 28d is installed on the upper surface of the bottom plate 28c. The seat base 28d covers the motor control device 33 from above and laterally. A driver's seat 29 is fixed to the upper surface of the seat base 28d.

[0036] Therefore, the travel motor 30 and the cargo handling motor 32 stored in the storage space 27 are installed inside the vehicle body 21 below the cabin 28. The motor control device 33 is also installed inside the vehicle body 21 below the cabin 28, and in front of the battery 40. The battery 40 is also located behind the cabin 28 at the rear of the vehicle body 21.

[0037] <Forklift details> The forklift 10 has a cooling fan 50. The forklift 10 may also have an introduction rectifying plate 53 and a guide rectifying plate 54, and may also have a first undercover 61, a second undercover 62, and a third undercover 63.

[0038] <Cooling fan> 2, 3, and 5, the cooling fan 50 is disposed inside the duct 38. The duct 38 is formed using the duct forming portion 26 of the counterweight 25. As described above, the counterweight 25 is disposed at the rear of the vehicle body 21. Therefore, it can be said that the cooling fan 50 disposed in the duct 38 is disposed at the rear of the vehicle body 21 and inside the vehicle body 21. Therefore, it can be said that the forklift 10 has a cooling fan 50 installed inside the vehicle body 21.

[0039] Furthermore, the duct 38 is disposed rearward of the storage space 27. The cooling fan 50 is disposed inside the duct 38. Therefore, the storage space 27 extends inside the vehicle body 21 from the front end of the vehicle body 21 to the cooling fan 50. Therefore, it can be said that the storage space 27 extending from the front end of the vehicle body 21 to the cooling fan 50 is defined inside the vehicle body 21.

[0040] The cooling fan 50 is disposed near the front end of the duct 38 in the front-rear direction. The cooling fan 50 is disposed rearward of the cargo handling motor 32 in the front-rear direction. The travel motor 30 is disposed forward of the cargo handling motor 32. Therefore, the travel motor 30 and the cargo handling motor 32 are disposed forward of the cooling fan 50.

[0041] The cooling fan 50 is positioned above the flow of wind caused by running the vehicle, which flows from the front to the rear of the vehicle body 21. If the direction in which the wind flows from the front to the rear of the vehicle body 21 is defined as the air blowing direction F, the cooling fan 50 is disposed downstream of the travel motor 30 and the cargo handling motor 32 in the air blowing direction F. The cooling fan 50 is also disposed downstream of the motor control device 33 in the air blowing direction F.

[0042] The cooling fan 50 has a frame-shaped case 51 and blade members 52 housed in the case 51. The case 51 is open in the front-to-rear direction. That is, the case 51 is open toward the storage space 27 and toward the duct 38. The cooling fan 50 exhausts air to the rear of the case 51 by the rotation of the blade members 52. By the rotation of the blade members 52, the cooling fan 50 exhausts the traveling wind flowing from the front to the rear of the vehicle body 21 to the rear of the cargo handling motor 32 and the traveling motor 30. The cooling fan 50 takes in air from the storage space 27 and exhausts it to the duct 38.

[0043] <Introductory and guide plates> The introduction rectifying plate 53 is disposed at the front end of the vehicle body 21. The introduction rectifying plate 53 protrudes forward of the vehicle body 21 from the lower end of the front partition plate 24. When the vehicle body 21 is viewed from one side in the left-right direction, the introduction rectifying plate 53 extends substantially horizontally forward from the front partition plate 24. The introduction rectifying plate 53 introduces the traveling wind into the interior of the vehicle body 21.

[0044] 4, the introduction rectifying plate 53 extends in the left-right direction of the front partition plate 24. The introduction rectifying plate 53 is disposed above the power transmission device 31 and above the gap S.

[0045] As shown in Figures 2, 3 and 5, two guide rectifying plates 54 are provided on the vehicle body 21. One guide rectifying plate 54 is arranged on one side portion 23, and the other guide rectifying plate 54 is arranged on the other side portion 23. Each guide rectifying plate 54 is arranged in front of the side portion 23, rearward of the front partition plate 24. Each guide rectifying plate 54 is also arranged at the upper part of each side portion 23. The two guide rectifying plates 54 face each other in the left-right direction. Each guide rectifying plate 54 is also arranged above the travel motor 30.

[0046] The two guide rectifiers 54 are stored in the storage space 27. Therefore, the guide rectifiers 54 are installed inside the vehicle body 21 below the cabin 28. When the vehicle body 21 is viewed from one side in the left-right direction, each guide rectifier 54 extends with a downward slope from the front end to the rear end. Inside the vehicle body 21, the guide rectifiers 54 direct the traveling wind toward the cooling fan 50 while blowing it against the traveling motor 30 to cool it. In other words, the guide rectifiers 54 suppress the traveling wind introduced into the inside of the vehicle body 21 from diffusing upward.

[0047] <First undercover, second undercover, and third undercover> The first undercover 61 is disposed at the front of the vehicle body 21. The first undercover 61 has a rectangular shape. The first undercover 61 extends in the front-rear direction. The width of the first undercover 61 extends in the left-right direction.

[0048] The first undercover 61 covers the area between the front end of the vehicle body 21 and the first bottom 22a from below. For this reason, it can be said that the first undercover 61 defines the storage space 27 from below. The first undercover 61 is disposed below the power transmission device 31 and the traveling motor 30. Note that the manner in which the first undercover 61 is disposed may be changed as appropriate, as long as it is disposed below the traveling motor 30 and covers the area between the front end of the vehicle body 21 and the first bottom 22a from below.

[0049] The second undercover 62 is disposed between the first bottom portion 22a and the second bottom portion 22b in the front-rear direction. The second undercover 62 spans between the first bottom portion 22a and the second bottom portion 22b. The second undercover 62 covers the area between the first bottom portion 22a and the second bottom portion 22b. The second undercover 62 is joined to the first bottom portion 22a and the second bottom portion 22b. For this reason, it can be said that the second undercover 62 defines the storage space 27 from below. Note that the joining manner and joining position of the second undercover 62 may be changed as appropriate, as long as the second undercover 62 spans between the first bottom portion 22a and the second bottom portion 22b and covers the area between the first bottom portion 22a and the second bottom portion 22b.

[0050] The second undercover 62 is inclined upward from the first bottom 22a to the second bottom 22b. In other words, the second undercover 62 is inclined upward from the travel motor 30 to the load-handling motor 32. The second bottom 22b is disposed in front of the cooling fan 50. Therefore, the second undercover 62 is inclined upward from the front to the rear toward the cooling fan 50. The second undercover 62 is located between the front end of the vehicle body 21 and the cooling fan 50. Therefore, the second undercover 62 can be said to be an inclined portion located between the front end of the vehicle body 21 and the cooling fan 50.

[0051] The third undercover 63 is disposed between the second bottom portion 22b and the counterweight 25 in the front-rear direction. The third undercover 63 spans between the second bottom portion 22b and the counterweight 25. The third undercover 63 covers the area between the second bottom portion 22b and the counterweight 25. The third undercover 63 is joined to the second bottom portion 22b and the counterweight 25. For this reason, it can be said that the third undercover 63 defines the storage space 27 from below. Note that the joining manner and joining position of the third undercover 63 may be changed as appropriate, as long as it covers the area between the second bottom portion 22b and the counterweight 25.

[0052] The first undercover 61, the second undercover 62, and the third undercover 63, together with the first bottom 22a and the second bottom 22b, define the storage space 27. In other words, the first undercover 61, the second undercover 62, and the third undercover 63 each eliminate a portion that opens downward in the storage space 27. In other words, the forklift 10 can be said to have the first to third undercovers 61 to 63 that cover the storage space 27 from below.

[0053] Therefore, the storage space 27 is closed from above by the bottom plate 28c of the cabin 28, and is closed from below by the first to third under covers 61 to 63. Although there are slight gaps due to the configuration of the forklift 10, the storage space 27 can be said to be a closed space.

[0054] [Operation of the embodiment] When the forklift 10 travels, the cooling fan 50 is driven in conjunction with the travel motor 30. The cooling fan 50 then draws air into the storage space 27 and exhausts it to the duct .

[0055] When the forklift 10 travels, wind generated by the travel is introduced into the interior of the vehicle body 21 from the front side through the gap S. At this time, the wind is made to flow easily toward the gap S by the introduction straightening plate 53.

[0056] Inside the vehicle body 21, the guide rectifier 54 guides a portion of the traveling wind that has flowed into the vehicle body 21 toward the cooling fan 50, while directing it against the traveling motor 30 to cool it. Inside the vehicle body 11, the cooling fan 50 draws air into the storage space 27 and exhausts it to the duct 38. Therefore, the speed of the traveling wind that has flowed into the storage space 27 is increased by the cooling fan 50. Then, after the increased speed of the traveling wind comes into contact with the traveling motor 30, the cargo handling motor 32, and the motor control device 33, it passes through the cooling fan 50 and is exhausted to the duct 38.

[0057] The first undercover 61 guides the traveling wind that flows into the storage space 27 toward the traveling motor 30 without diffusing it downward. The second undercover 62 guides the traveling wind toward the loading motor 32 without diffusing it downward. The third undercover 63 guides the traveling wind toward the cooling fan 50 without diffusing it downward. Heat generated in the control unit 34 of the motor control device 33 is discharged toward the storage space 27 by the fan 35.

[0058] According to the above embodiment, the following effects can be obtained. (1) The battery 40 is installed at the rear of the vehicle body 21. The travel motor 30 and the load-handling motor 32 are disposed in the storage space 27, in front of the battery 40, behind the front end of the vehicle body 21, and in front of the cooling fan 50. In this forklift 10, the traveling wind introduced into the vehicle body 21 flows toward the travel motor 30 and the load-handling motor 32 without being blocked by the battery 40. The cooling fan 50 exhausts the traveling wind flowing from the front to the rear toward the rear of the travel motor 30 and the load-handling motor 32. Therefore, the traveling wind flowing inside the vehicle body 21 is drawn in by the cooling fan 50 without changing its flow direction. As a result, the wind speed of the traveling wind can be increased compared to when the cooling fan 50 is not present or when the flow direction of the traveling wind is changed. When the increased wind speed comes into contact with the traveling motor 30, the load-handling motor 32, and the motor control device 33, the cooling efficiency of these heat-generating elements can be improved.

[0059] (2) The introduction rectifying plate 53 directs the traveling wind toward the gap S. Therefore, compared to when the introduction rectifying plate 53 is not present, a larger amount of traveling wind can be introduced into the vehicle body 21. Therefore, compared to when the introduction rectifying plate 53 is not present, the cooling efficiency of the traveling motor 30, the cargo handling motor 32, and the motor control device 33 using the traveling wind can be improved.

[0060] (3) The guide rectifier 54 suppresses upward diffusion of the traveling wind introduced into the inside of the vehicle body 21. Therefore, inside the vehicle body 21, the guide rectifier 54 can direct the traveling wind toward the cooling fan 50 while blowing it against the traveling motor 30 to cool it. As a result, compared to a case where the guide rectifier 54 is not provided, the cooling efficiency of the traveling motor 30, the cargo handling motor 32, and the motor control device 33 using the traveling wind can be improved.

[0061] (4) The forklift 10 has the lead-in rectifying plate 53 and the guide rectifying plate 54. Therefore, both the lead-in rectifying plate 53 and the guide rectifying plate 54 can further improve the cooling efficiency of the travel motor 30, the cargo handling motor 32, and the motor control device 33.

[0062] (5) The storage space 27 stores the travel motor 30 and the load-handling motor 32. The lower part of this storage space 27 is covered by a first undercover 61, a second undercover 62, and a third undercover 63. These first to third undercovers 61 to 63 suppress downward diffusion of the traveling wind flowing through the storage space 27. This suppresses a decrease in the volume of the traveling wind that accompanies the diffusion of the traveling wind. As a result, a decrease in the cooling efficiency of the traveling motor 30, the load-handling motor 32, and the motor control device 33 using the traveling wind can be suppressed.

[0063] (6) The first undercover 61 extends from the front end of the vehicle body 21 to below the traveling motor 30. Therefore, the first undercover 61 can direct the traveling wind introduced from the front end of the vehicle body 21 toward the traveling motor 30 while suppressing the downward diffusion of the traveling wind. Therefore, the first undercover 61 contributes to improving the cooling efficiency of the traveling motor 30.

[0064] (7) The cargo handling motor 32 is disposed above the traveling motor 30. The second undercover 62 is inclined upward from the traveling motor 30 toward the cargo handling motor 32. Therefore, the second undercover 62 can direct the traveling wind toward the cargo handling motor 32 while suppressing the downward diffusion of the traveling wind. Therefore, the second undercover 62 contributes to improving the cooling efficiency of the cargo handling motor 32.

[0065] (8) The third undercover 63 extends from the rear end of the cargo handling motor 32 to the cooling fan 50. Therefore, the third undercover 63 can direct the traveling wind toward the cooling fan 50 while suppressing downward diffusion of the traveling wind. Therefore, the third undercover 63 contributes to improving the air blowing efficiency of the cooling fan 50.

[0066] (9) The cooling fan 50 is disposed downstream of the cargo handling motor 32 in the airflow direction F. Therefore, the cooling fan 50 can draw in the traveling wind along the airflow direction F. Therefore, the cooling fan 50 can draw in the traveling wind without any pressure loss, and can suitably increase the wind speed of the traveling wind.

[0067] (10) The motor control device 33 is arranged with the fan 35 facing the storage space 27. Therefore, heat generated in the control unit 34 is discharged into the storage space 27 by the fan 35. The heat discharged into the storage space 27 is then discharged to the outside of the vehicle body 11 by the wind generated by running. Therefore, the cooling efficiency of the control unit 34 can be improved compared to when the fan 35 does not face the storage space 27.

[0068] (11) The travel motor 30 and the load handling motor 32 are disposed between the cooling fan 50 and the front end of the vehicle body 21 in the longitudinal direction. Therefore, the wind generated by travel, which has increased in speed, comes into contact with both the travel motor 30 and the load handling motor 32. Therefore, installing the cooling fan 50 improves the cooling efficiency of both the travel motor 30 and the load handling motor 32.

[0069] (12) The forklift 10 has a duct 38 inside the counterweight 25. The duct 38 discharges the exhaust air from the cooling fan 50 to the outside of the vehicle body 11. Therefore, the duct 38 prevents heat from building up inside the vehicle body 11.

[0070] (13) The heat transfer member 39 can transfer the heat of the battery 40 to the counterweight 25. Therefore, the heat transfer member 39 prevents the temperature of the battery 40 from rising excessively.

[0071] (14) The heat transfer member 39 covers the duct defining portion 26 of the counterweight 25 from above. The duct 38 is defined by the duct defining portion 26 and the heat transfer member 39. Therefore, the wind flowing through the duct 38 comes into contact with the heat transfer member 39. Therefore, the heat transfer member 39 can be cooled by the wind, and the battery 40 can be cooled by the wind.

[0072] (15) The motor control device 33 is disposed above the storage space 27. Therefore, the motor control device 33 does not obstruct the flow of wind generated by traveling in the storage space 27. Furthermore, the fan 35 of the motor control device 33 faces the storage space 27. The fan 35 can then expel heat from the control unit 34 into the storage space 27. Therefore, by disposing the motor control device 33 in a suitable position, the cooling efficiency of the traveling motor 30 and the cargo handling motor 32 by the wind generated by traveling can be improved, while the motor control device 33 can also be suitably cooled.

[0073] (16) Simply by adding the cooling fan 50, the cooling efficiency of the travel motor 30, the cargo handling motor 32, and the motor control device 33 can be improved by utilizing the wind generated by travel. For example, the forklift 10 does not require large-scale equipment such as refrigerant piping, a radiator fan, or a radiator, as is required when the travel motor 30, the cargo handling motor 32, and the motor control device 33 are water-cooled. Therefore, compared to the case of water cooling, installing the cooling fan 50 can inexpensively improve the cooling efficiency of the travel motor 30, the cargo handling motor 32, and the motor control device 33.

[0074] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The fan 35 of the motor control device 33 does not have to face the storage space 27.

[0075] The motor control device 33 may be only the control unit 34 without the fan 35. In this case, it is preferable that the control unit 34 of the motor control device 33 faces the storage space 27. In this case, heat generated in the control unit 34 is released into the wind flowing through the storage space 27.

[0076] The vertical positions of the first bottom portion 22a and the second bottom portion 22b may be changed. The inclination of the second undercover 62 may be changed depending on the vertical positions of the first bottom portion 22a and the second bottom portion 22b. When the first bottom portion 22a and the second bottom portion 22b are at the same vertical position, the second undercover 62 extends horizontally between the first bottom portion 22a and the second bottom portion 22b. Conversely, when the first bottom portion 22a is positioned higher than the second bottom portion 22b, the second undercover 62 slopes downward from the first bottom portion 22a to the second bottom portion 22b.

[0077] When the second bottom portion 22b is located below the duct formation portion 26, the third undercover 63 is installed so as to slope upward from the second bottom portion 22b toward the counterweight 25. In other words, the third undercover 63 slopes upward toward the cooling fan 50 from the front end to the rear end. In this case, the third undercover 63 can be said to be an inclined portion located between the front end of the vehicle body 21 and the cooling fan 50.

[0078] At least one of the first to third under covers 61 to 63 may be omitted. The area below the storage space 27 from the front end of the vehicle body 21 to the front end of the counterweight 25 may be covered with a single undercover.

[0079] The forklift 10 may have at least one of the inlet flow straightening plate 53 and the guide flow straightening plate 54. In this specification, the expression "at least one of the inlet flow straightening plate 53 and the guide flow straightening plate 54" means only the inlet flow straightening plate 53, only the guide flow straightening plate 54, or both the inlet flow straightening plate 53 and the guide flow straightening plate 54.

[0080] The motor control device 33 may be disposed inside the storage space 27. For example, the motor control device 33 may be disposed between the travel motor 30 and the cargo handling motor 32 in the front-rear direction, or between the cargo handling motor 32 and the cooling fan 50 in the front-rear direction.

[0081] The positions of the travel motor 30 and the cargo handling motor 32 in the front-rear direction may be interchanged. The industrial vehicle may be other than the forklift 10. [Explanation of symbols]

[0082] 10...forklift as industrial vehicle, 14...load handling equipment, 21...vehicle body, 27...storage space, 28...cabin, 30...travel motor, 32...load handling motor, 33...motor control device, 34...control unit, 35...fan, 40...battery, 50...cooling fan, 53...introduction rectifier plate, 54...guiding rectifier plate, 61...first undercover, 62...second undercover, 63...third undercover.

Claims

1. A vehicle body into which running wind is introduced from the front, a drive wheel disposed in front of the vehicle body; a steering wheel disposed at the rear of the vehicle body; a cabin erected upward from the upper surface of the vehicle body; a loading device installed at the front of the vehicle body; a cargo handling motor installed inside the vehicle body below the cabin and configured to drive the cargo handling device; a traction motor installed inside the vehicle body below the cabin and configured to drive the drive wheels; a motor control device that is installed inside the vehicle body below the cabin and controls the cargo handling motor and the travel motor; a battery as a power source for the cargo handling motor and the traveling motor; a counterweight disposed inside the vehicle body above the steering wheel; a cooling fan installed inside the vehicle body, The counterweight has a weight body, a heat transfer member is disposed on an upper surface of the weight body, and a duct opening at a rear end surface of the vehicle body is defined between the weight body and the heat transfer member by recessing the upper surface of the weight body from the front end to the rear end of the weight body; The cooling fan is disposed inside the duct, a storage space is defined inside the vehicle body, the storage space extending from a front end of the vehicle body to the cooling fan, and the travel motor and the cargo handling motor are stored in the storage space; the battery is placed on an upper surface of the heat transfer member; the motor control device is fixed to an upper portion of the vehicle body so as to face the storage space, The cooling fan exhausts the traveling wind flowing from the front to the rear of the vehicle body to the outside of the vehicle body through the duct.

2. 2. The industrial vehicle according to claim 1, further comprising at least one of an inlet straightening plate that protrudes forward from the front end of the vehicle body and guides the traveling wind into the interior of the vehicle body, and a guide straightening plate that is positioned inside the vehicle body below the cabin and directs the traveling wind toward the cooling fan.

3. An undercover that covers the storage space from below, 3. The industrial vehicle according to claim 1, wherein the undercover has an inclined portion located between the front end of the vehicle body and the cooling fan, and the inclined portion inclines upward toward the cooling fan from the front to the rear.

4. The industrial vehicle according to any one of claims 1 to 3, wherein the motor control device has a control unit that controls the cargo handling motor and the travel motor, and a fan for cooling the control unit, the fan facing the storage space.

Images