Industrial Vehicles

Abstract

To provide an industrial vehicle capable of reducing a risk of heat damage to a signal line.SOLUTION: An industrial vehicle 10 in which a battery 20 is stored in a vehicle body 11, includes a control device 40 controlling a control object mounted on the industrial vehicle 10, a power supply line 50 supplying power of the battery 20 to the control object from the control device 40, and a signal line 60 connected to the control device 40 to transmit a signal for controlling the control target. The control object, the control device 40, the power supply line 50, and the signal line 60 are stored in the vehicle body 11. The vehicle body 11 has a left-side wall 16 provided on a left end of the vehicle body 11, a right-side wall 17 provided on a right end of the vehicle body 11, and a lower wall provided below the vehicle body 11. The power supply line 50 has a portion extending in a first direction A along the lower wall. The signal line 60 has a portion extending along the left-side wall 16.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 describes a battery-powered industrial vehicle. The battery-powered industrial vehicle includes a battery, a control device that controls the electrical system of the battery-powered industrial vehicle, and electric wires extending from the control device. The body of the battery-powered industrial vehicle is provided with a storage section for the battery. A recess that is recessed downward is provided at the bottom of the storage section. In the battery-powered industrial vehicle, electric wires are stored in a space partitioned by the battery and the recess. The electric wires extend in the forward and rearward directions of the vehicle body.

[0003] The control device is accommodated in a recess in the counterweight that is disposed rearward of the battery on the vehicle. The electric wires pass through the recess and are connected to the control device. The electric wires include a power supply line that supplies power from the battery to the electrical system of the battery-powered industrial vehicle, and a signal line that transmits a signal for controlling the electrical system of the battery-powered industrial vehicle. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-2080 Summary of the Invention [Problem to be solved by the invention]

[0005] When a high voltage is applied to the power supply line, heat is generated from the power supply line. The heat generated from the power supply line is not only transferred to the signal line, but also accumulates in the space partitioned by the battery and the recess. This places the signal line in a high-temperature environment, increasing the risk of heat damage to the signal line. [Means for solving the problem]

[0006] An industrial vehicle that solves the above problem is an industrial vehicle that houses a battery in a vehicle body, and is equipped with a control device that controls a control object mounted on the industrial vehicle, a power supply line that supplies power from the battery from the control device to the control object, and a signal line that is connected to the control device and transmits a signal to control the control object, wherein the control object, the control device, the power supply line, and the signal line are housed in the vehicle body, the vehicle body has side walls provided at the left and right ends of the vehicle body and a bottom wall provided below the vehicle body, the power supply line has a portion that extends forward and rearward of the vehicle body along the bottom wall, and the signal line has a portion that extends at least along the side walls.

[0007] According to this, since the side wall of the vehicle body is cooled by the air outside the industrial vehicle, the signal line is easily cooled through the side wall, thereby reducing the risk of heat damage to the signal line. In the above industrial vehicle, the controlled object may include a motor that serves as a drive source for the industrial vehicle, and the signal line may connect at least the motor and the control device.

[0008] With this, even if heat generated by the motor is transmitted to the signal line, it is easy for the heat to be dissipated from the side wall of the vehicle body, and therefore the heat generated by the motor can be easily dissipated to the outside of the vehicle body. In the above-mentioned industrial vehicle, the battery is housed in a counterweight located at the rearmost part of the vehicle body, the control device is located forward of the battery in the vehicle body, and the signal line is preferably provided forward of the battery in the vehicle body.

[0009] According to this, since there is no overlap between the signal line and the battery, heat generated by the battery is less likely to be transmitted to the signal line, thereby further reducing the risk of heat damage to the signal line. In the above industrial vehicle, the industrial vehicle is a forklift equipped with a hydraulic mechanism, the controlled object includes a motor that serves as a drive source for the forklift, the motor being a traveling motor for driving front wheels of the forklift, and a loading motor for driving the hydraulic mechanism, the traveling motor, the loading motor, the control device, and the battery are arranged in this order from the front of the vehicle body to the rear of the vehicle body, the power supply line connects the loading motor to the control device, and the traveling motor to the control device, and the signal line connects at least the loading motor to the control device, and the traveling motor to the control device, and the distance at which the power supply line and the signal line are closest is preferably greater than the distance at which the portion of the power supply line extending along the lower wall is closest to the loading motor and the distance at which the portion of the power supply line extending along the lower wall is closest to the traveling motor.

[0010] This creates a space between the power supply line and the signal line in which the loading motor and the traveling motor can be arranged, increasing the degree of freedom in the arrangement of the loading motor and the traveling motor. This makes it possible to arrange the loading motor and the traveling motor apart from each other, making it difficult for heat to be transmitted from the loading motor and the traveling motor to the signal line.

[0011] In the above-mentioned industrial vehicle, the lower wall has a storage recess that is recessed downward and extends in the front and rear directions of the vehicle body, and the portion of the power supply line that extends in the front and rear directions of the vehicle body along the lower wall is accommodated in the storage recess.

[0012] According to this, the position where the signal line is arranged and the position where the power supply line is arranged can be shifted upward and downward on the vehicle body, so that heat generated in the power supply line is less likely to be transmitted to the signal line. Effect of the Invention

[0013] According to the present invention, the risk of heat damage to signal lines can be reduced. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic configuration diagram of a first embodiment of an industrial vehicle. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 in FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 in FIG. 1. [Figure 4] FIG. 4 is a schematic configuration diagram of a second embodiment of an industrial vehicle. [Diagram 5] FIG. 13 is a schematic configuration diagram of a modified example of the industrial vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [First embodiment] Hereinafter, a first embodiment embodying an industrial vehicle will be described with reference to Figs. <Outline of industrial vehicle configuration> As shown in Fig. 1, the industrial vehicle 10 is a forklift that houses a battery 20 in a vehicle body 11. The industrial vehicle 10 is a battery-powered forklift that is driven by power from the battery 20. In the following description, a first direction A refers to a direction including the front and rear directions of the industrial vehicle 10, a second direction B refers to a direction including the left and right directions of the industrial vehicle 10, and a third direction C refers to a direction including the top and bottom directions of the industrial vehicle 10.

[0016] The industrial vehicle 10 is equipped with a left front wheel 12, a right front wheel 13, and a pair of rear wheels 14. The industrial vehicle 10 is equipped with a hydraulic mechanism 30, a control device 40, a power supply line 50, a signal line 60, and two travel motors 70. The hydraulic mechanism 30, the control device 40, the power supply line 50, and the signal line 60 are housed in a vehicle body 11. The pair of rear wheels 14 are steered by a steering wheel (not shown) of the industrial vehicle 10. Note that the hydraulic mechanism 30, the control device 40, the power supply line 50, and the two travel motors 70 shown in FIG. 1 would normally be invisible due to the vehicle body 11, but for the sake of convenience, their arrangement is shown in the drawings.

[0017] The hydraulic mechanism 30 is a mechanism for controlling the supply and discharge of hydraulic oil to hydraulic equipment including hydraulic cylinders equipped in the forklift. The hydraulic mechanism 30 has two loading motors 31. The two loading motors 31 are motors for driving the hydraulic mechanism 30. The two loading motors 31 are motors that serve as driving sources for driving the above-mentioned hydraulic equipment. One of the two loading motors 31 is a primary motor, and the other of the two loading motors 31 is a secondary motor that assists the one loading motor 31.

[0018] The industrial vehicle 10 uses two travel motors 70 as drive sources to drive the left front wheel 12 and the right front wheel 13. One of the two travel motors 70 drives the left front wheel 12, and the other drives the right front wheel 13. The industrial vehicle 10 travels as the left front wheel 12 and the right front wheel 13 rotate. The two loading motors 31 and the two travel motors 70 are examples of motors that serve as drive sources for the industrial vehicle 10. The two loading motors 31 and the two travel motors 70 are DC series-wound motors.

[0019] The control device 40 includes a processor (not shown), such as a CPU or GPU, and a storage unit (not shown), such as a RAM and a ROM. The storage unit stores program codes or instructions configured to cause the processor to execute processes. The storage unit, i.e., the computer-readable medium, includes any available medium that can be accessed by a general-purpose or special-purpose computer.

[0020] The control device 40 controls the controlled objects mounted on the industrial vehicle 10 according to a program stored in the storage unit. The control device 40 includes an electric circuit (not shown) for driving each of the two travel motors 70 and the two loading motors 31. The control device 40 controls the two travel motors 70 and the two loading motors 31 by operating the above-mentioned electric circuit in accordance with a program stored in the storage unit. This causes the industrial vehicle 10 to travel and the hydraulic cylinders of the hydraulic mechanism 30 to operate. The two travel motors 70 and the two loading motors 31 are included in the objects to be controlled by the control device 40.

[0021] <Body configuration> 1, the vehicle body 11 has a left side wall 16 provided at the left end and a right side wall 17 provided at the right end. The left side wall 16 and the right side wall 17 face each other in the second direction B. The outer surfaces of the left side wall 16 and the right side wall 17 are exposed to the outside of the vehicle body 11. The left side wall 16 and the right side wall 17 are examples of side walls.

[0022] The vehicle body 11 has a counterweight 15 indicated by a two-dot chain line. The counterweight 15 is disposed at the rearmost part of the vehicle body 11. The battery 20 is accommodated in the counterweight 15.

[0023] As shown in FIG. 2 and FIG. 3, the vehicle body 11 has a lower wall 18 provided below the vehicle body 11. The lower wall 18 is in the shape of a flat plate extending in the first direction A and the second direction B. The left side wall 16 is integrally provided at one end of the lower wall 18 in the second direction B, and the right side wall 17 is integrally provided at the other end of the lower wall 18 in the second direction B. The lower wall 18 is provided with an accommodating recess 18a provided so as to be recessed downward. The accommodating recess 18a is formed by reducing the thickness of a predetermined range of the lower wall 18 in the second direction B. The predetermined range is a range smaller than the distance between the left side wall 16 and the right side wall 17. The accommodating recess 18a does not include the left side wall 16 and the right side wall 17 in the second direction B. The accommodating recess 18a extends in the first direction A. The accommodating recess 18a is disposed below the left side wall 16 and the right side wall 17 in the third direction C.

[0024] The accommodating recess 18a may be formed by bending the lower wall 18 in the second direction B. The lower wall 18 and the left side wall 16 may be made of different materials. The lower wall 18 and the right side wall 17 may be made of different materials. The vehicle body 11 is made of metal. In this embodiment, the vehicle body 11 is made of an iron-based material.

[0025] <Layout of travel motor, cargo handling motor, control device, and battery> The following describes the arrangement of the two travel motors 70, the two cargo motors 31, the control device 40, and the battery 20. Note that the description using Fig. 1 will be given from the perspective of the industrial vehicle 10 as seen from above.

[0026] 1, the control device 40 is disposed in front of the battery 20 on the vehicle body 11 in the first direction A. In the first direction A, the control device 40 and the battery 20 are adjacent to each other with a predetermined distance therebetween.

[0027] The two loading motors 31 are disposed in front of the control device 40 on the vehicle body 11 in the first direction A. The two loading motors 31 and the control device 40 are adjacent to each other with a predetermined distance therebetween in the first direction A. The two loading motors 31 are adjacent to each other with a predetermined distance therebetween in the second direction B.

[0028] 2, the two loading motors 31 are arranged so as not to come into contact with the lower wall 18 in the third direction C. The two loading motors 31 are supported by a support member (not shown) inside the vehicle body 11. The two loading motors 31 are placed on the support member and thereby arranged at a position away from the lower wall 18.

[0029] As shown in FIG. 1, the two travel motors 70 are disposed in front of the two loading motors 31 on the vehicle body 11 in the first direction A. One of the two travel motors 70 and one of the two loading motors 31 are adjacent to each other at a predetermined distance in the first direction A. The other of the two travel motors 70 and the other of the two loading motors 31 are adjacent to each other at a predetermined distance in the first direction A. The two travel motors 70 are adjacent to each other at a predetermined distance in the second direction B. The travel motors 70, loading motors 31, control device 40, and battery 20 are disposed in this order from the front of the vehicle body 11 to the rear of the vehicle body 11.

[0030] 3, the two travel motors 70 are arranged so as not to come into contact with the lower wall 18 in the third direction C. The two travel motors 70 are supported by a support member (not shown) inside the vehicle body 11. The two travel motors 70 are placed on the support member and thereby arranged at a position away from the lower wall 18.

[0031] <Power supply line configuration> 1, the power supply line 50 is wiring that supplies power from the battery 20 from the control device 40 to the two travel motors 70 and the two loading motors 31 that are to be controlled. The power supply line 50 has a first supply line 51, two second supply lines 52, and two third supply lines 53.

[0032] The first supply line 51 connects the battery 20 and the control device 40. The first supply line 51 includes a positive wiring and a negative wiring that connect the battery 20 and the control device 40. The first supply line 51 passes through the counterweight 15. The first supply line 51 is a wiring for supplying power from the battery 20 to the control device 40.

[0033] One of the two second supply lines 52 connects one of the two travel motors 70 to the control device 40, and the other connects the other of the two travel motors 70 to the control device 40. The second supply lines 52 include positive and negative wiring that connect the travel motors 70 and the control device 40. The two second supply lines 52 extend in the first direction A through the center of the vehicle body 11 in the second direction B. The second supply lines 52 are wiring for supplying the power of the battery 20 supplied to the control device 40 to the two travel motors 70.

[0034] One of the two third supply lines 53 connects one of the two loading motors 31 to the control device 40, and the other connects the other of the two loading motors 31 to the control device 40. The third supply line 53 includes a positive wiring and a negative wiring that connect the loading motor 31 to the control device 40. The two third supply lines 53 are arranged to sandwich the two second supply lines 52 in the second direction B. The two third supply lines 53 extend in the first direction A. The third supply line 53 is a wiring for supplying the power of the battery 20 supplied to the control device 40 to the two loading motors 31. The power supply line 50 connects the loading motor 31 to the control device 40, and the traveling motor 70 to the control device 40.

[0035] As shown in FIG. 2, the third supply line 53 has a first extension portion 53a accommodated in the accommodation recess 18a and a second extension portion 53b extending upward from the first extension portion 53a. The first extension portion 53a extends in the first direction A inside the accommodation recess 18a. The first extension portion 53a is an example of a portion of the power supply line 50 extending in the first direction A along the lower wall 18. The first extension portion 53a extends inside the accommodation recess 18a from the control device 40 to below the loading motor 31. The second extension portion 53b is connected to the loading motor 31 above the first extension portion 53a. The power supply line 50 has a portion extending in the first direction A along the lower wall 18 like the first extension portion 53a.

[0036] As shown in FIG. 3, the second supply line 52 has a first extension portion 52a accommodated in the accommodation recess 18a and a second extension portion 52b extending upward from the first extension portion 52a. The first extension portion 52a extends in the first direction A inside the accommodation recess 18a. The first extension portion 52a is an example of a portion of the power supply line 50 extending in the first direction A along the lower wall 18. The first extension portion 52a extends inside the accommodation recess 18a from the control device 40 to below the traveling motor 70. The second extension portion 52b is connected to the traveling motor 70 above the first extension portion 52a. The power supply line 50 has a portion extending in the first direction A along the lower wall 18 like the first extension portion 52a.

[0037] <Signal line configuration> As shown in Fig. 1, the signal line 60 is connected to the control device 40. The signal line 60 is provided forward of the battery 20 on the vehicle body 11 in the first direction A. The signal line 60 is an example of a signal line that transmits signals for controlling the two loading motors 31 and the two travel motors 70 that are to be controlled. The signal line 60 has a first extension portion 61, a second extension portion 62, a third extension portion 63, a fourth extension portion 64, and a main extension portion 65.

[0038] The main extension portion 65 is connected to the control device 40. The main extension portion 65 extends along the left side wall 16. That is, the signal line 60 has at least a portion that extends along the left side wall 16.

[0039] As shown in FIG. 2 and FIG. 3, the main extension portion 65 has a first portion 65a extending in the first direction A and a second portion 65b extending from the first portion 65a in the third direction C. Four second portions 65b are provided. The first extension portion 61 is continuous with one of the four second portions 65b. The second extension portion 62 is continuous with another of the four second portions 65b. The third extension portion 63 is continuous with another of the four second portions 65b. The fourth extension portion 64 is continuous with another of the four second portions 65b. The four second portions 65b extend in the third direction C to a position above the loading motor 31 and the traveling motor 70.

[0040] As shown in FIG. 2, the first extension portion 61 is connected to one of the two loading motors 31. The first extension portion 61 is disposed above one of the loading motors 31. In the third direction C, one of the loading motors 31 is disposed between the first extension portion 61 and the power supply line 50. The second extension portion 62 is connected to the other of the two loading motors 31. The second extension portion 62 is disposed above the two loading motors 31. The second extension portion 62 extends so as to straddle the two second supply lines 52 and the two third supply lines 53. The second extension portion 62 extends so as to straddle the power supply line 50. In the third direction C, two loading motors 31 are disposed between the second extension portion 62 and the power supply line 50.

[0041] Each of the two loading motors 31 includes a current sensor 32. The current sensor 32 detects the current flowing through the loading motor 31 and outputs a signal according to the current. The first extension part 61 is connected to the current sensor 32 of one of the loading motors 31, and the second extension part 62 is connected to the current sensor 32 of the other loading motor 31.

[0042] As shown in FIG. 3, the third extension portion 63 is connected to one of the two travel motors 70. The third extension portion 63 is disposed above one of the travel motors 70. In the third direction C, one of the travel motors 70 is disposed between the third extension portion 63 and the power supply line 50. The fourth extension portion 64 is disposed above the two travel motors 70. The fourth extension portion 64 extends so as to straddle the two second supply lines 52. The fourth extension portion 64 extends so as to straddle the power supply line 50. In the third direction C, two travel motors 70 are disposed between the fourth extension portion 64 and the power supply line 50.

[0043] Each of the two traveling motors 70 includes a current sensor 71. The current sensor 71 detects the current flowing through the traveling motor 70 and outputs a signal according to the current. The third extension portion 63 is connected to the current sensor 71 of one traveling motor 70, and the fourth extension portion 64 is connected to the current sensor 71 of the other traveling motor 70. The signal line 60 configured in this manner at least connects the loading motor 31 and the control device 40, and the traveling motors 70 and the control device 40.

[0044] As shown in Figures 1, 2 and 3, signals output from the current sensors 32, 71 are input to the control device 40 via a signal line 60. That is, the signal line 60 in this embodiment is a wiring for inputting signals output from the cargo motor 31 and the traveling motor 70, which are the objects to be controlled, to the control device 40. The control device 40 calculates the current values ​​of the currents flowing through the two cargo motors 31 and the two traveling motors 70 based on the input signals. An electric circuit included in the control device 40 operates based on the calculated current values. Depending on the operating state of the electric circuit, a state in which a current flows through the second supply line 52 and the third supply line 53 and a state in which a current does not flow are switched.

[0045] <Layout of power supply lines and signal lines> As shown in FIG. 2, the distance at which the power supply line 50 and the signal line 60 are closest is defined as distance D1. Distance D1 is the distance between the first portion 65a of the main extension portion 65 and the first extension portion 53a of one of the third supply lines 53. The distance at which the first extension portion 53a of one of the third supply lines 53 is closest to one of the loading motors 31 is defined as distance D2. The distance at which the main extension portion 65 and the left side wall 16 are closest is defined as distance D3. Distance D1 is greater than distance D2. Distance D3 is less than distance D1.

[0046] 3, the distance between the first portion 65a of the main extension portion 65 and the first extension portion 52a of one of the second supply lines 52 is defined as a distance D4. The distance at which the first extension portion 52a of one of the second supply lines 52 is closest to one of the travel motors 70 is defined as a distance D5. The distance D4 is greater than the distance D5. The distance D3 is smaller than the distance D4.

[0047] If the cargo handling motor 31 and the traveling motor 70 have high output, a high voltage acts on the power supply line 50, which may cause noise to be generated by the power supply line 50. The distances D1 and D4 in this embodiment are distances that have been confirmed in advance to ensure that noise from the power supply line 50 is not transmitted through the signal line 60.

[0048] <Action of this embodiment> The operation of this embodiment will now be described. The left side wall 16 and the right side wall 17 are cooled by the air outside the industrial vehicle 10. Since the main extension portion 65 of the signal line 60 extends along the left side wall 16, the signal line 60 is easily cooled via the left side wall 16.

[0049] Even if a high voltage acts on the power supply line 50 and generates noise from the power supply line 50, the distances D1 and D4 prevent the noise from the power supply line 50 from being transmitted to the signal line 60. Furthermore, by separating the power supply line 50 and the signal line 60 by the distances D1 and D4, a space for arranging the cargo motor 31 and the travel motor 70 is created between the signal line 60 and the power supply line 50, increasing the freedom of arrangement of the cargo motor 31 and the travel motor 70. This makes it possible to arrange the cargo motor 31 and the travel motor 70 at a distance from each other, making it difficult for heat to be transmitted from the cargo motor 31 and the travel motor 70 to the signal line.

[0050] <Effects of this embodiment> The effects of this embodiment will be described. (1-1) The signal line 60 has a main extension portion 65 that extends along the left side wall 16 that is cooled by the air outside the industrial vehicle 10. Therefore, the signal line 60 is easily cooled via the left side wall 16. Therefore, the risk of heat damage to the signal line 60 can be reduced.

[0051] (1-2) Even if heat generated by the loading motor 31 and the traveling motor 70 is transmitted to the signal line 60, the heat is easily dissipated from the left side wall 16 of the vehicle body 11. Therefore, the heat generated by the loading motor 31 and the traveling motor 70 is easily dissipated to the outside of the vehicle body 11.

[0052] (1-3) In the first direction A, the signal line 60 is provided further forward of the vehicle body 11 than the battery 20. Since there is no overlap between the signal line 60 and the battery 20, heat generated in the battery 20 is less likely to be transmitted to the signal line 60. This further reduces the risk of heat damage to the signal line 60.

[0053] (1-4) By separating the signal line 60 and the power supply line 50 by the distances D1 and D4, a space for arranging the cargo handling motor 31 and the traveling motor 70 is created between the signal line 60 and the power supply line 50, and the degree of freedom in arranging the cargo handling motor 31 and the traveling motor 70 is increased. Therefore, the cargo handling motor 31 and the traveling motor 70 can be arranged at a distance from each other, and heat is less likely to be transmitted from the cargo handling motor 31 and the traveling motor 70 to the signal line 60.

[0054] (1-5) The first extension portions 52a of the two second supply lines 52 and the first extension portions 53a of the two third supply lines 53 are accommodated in the accommodating recess 18a. Therefore, the position where the signal line 60 is arranged and the position where the power supply line 50 is arranged can be shifted in the third direction C. Therefore, heat generated in the power supply line 50 is less likely to be transmitted to the signal line 60.

[0055] (1-6) The distance D3 is smaller than the distances D1 and D4. Therefore, the signal line 60 is closer to the left side wall 16 than the power supply line 50. This improves the cooling efficiency of the signal line 60. (1-7) The left side wall 16 also functions as a shield to prevent noise generated outside the vehicle body 11 from being transmitted to the signal line 60.

[0056] (1-8) In the industrial vehicle 10, the battery 20 occupies a large proportion of the vehicle body 11. If the battery 20 is disposed in the center of the vehicle body 11 in the first direction A, the space in which various devices including the control targets are disposed is divided by the battery 20. When the various devices including the control targets are disposed in the divided space, the distance between the various devices including the control targets is likely to be short. For this reason, there is a risk that it will be difficult to cool the various devices including the control targets.

[0057] In this embodiment, the battery 20 is accommodated in the counterweight 15 disposed at the rearmost part of the vehicle body. Therefore, the space in which various devices including the control targets are disposed is not divided by the battery 20. This makes it easier to provide ample distance between the various devices including the control targets. This makes it easier to cool the various devices including the control targets.

[0058] (1-9) As a method for reducing the risk of heat damage to the signal line 60, it is possible to arrange the power supply line 50 along the left side wall 16 or the right side wall 17. However, if the power supply line 50 is arranged along the left side wall 16 or the right side wall 17, the power supply line 50 will be curved inside the vehicle body 11. From the viewpoint of power loss due to the power supply line 50, it is preferable that the power supply line 50 extend as straight as possible in the first direction A toward the control object.

[0059] In this regard, in this embodiment, the power supply line 50 extends in the first direction A from the control device 40 toward the controlled objects, the cargo handling motor 31 and the travel motor 70. Therefore, it is possible to reduce the risk of heat damage to the signal line 60 while suppressing the power loss due to the power supply line 50.

[0060] [Second embodiment] The second embodiment, which is an industrial vehicle, will be described below with reference to Fig. 4. The main difference between the first embodiment and this embodiment is that the configuration of the signal lines has been changed. This difference will be described in detail, and the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description will be omitted.

[0061] As shown in FIG. 4, the industrial vehicle 10 includes a first signal line 80 and a second signal line 90. The first signal line 80 is an example of a signal line that transmits a signal for controlling one of the cargo handling motors 31 and one of the traveling motors 70, which are to be controlled. The first signal line 80 has a first main extension portion 81, a cargo handling motor extension portion 82, and a traveling motor extension portion 83. The first main extension portion 81 is connected to the control device 40. The first main extension portion 81 extends along the left side wall 16. That is, the first signal line 80 has at least a portion that extends along the left side wall 16.

[0062] The loading / unloading motor extension portion 82 is continuous with the first main extension portion 81. The loading / unloading motor extension portion 82 is connected to one of the loading / unloading motors 31. The loading / unloading motor extension portion 82 is disposed above one of the loading / unloading motors 31. The loading / unloading motor extension portion 82 is connected to the current sensor 32 of one of the loading / unloading motors 31.

[0063] The travel motor extension portion 83 is continuous with the first main extension portion 81. The travel motor extension portion 83 is connected to one of the travel motors 70. The travel motor extension portion 83 is disposed above one of the travel motors 70. The travel motor extension portion 83 is connected to the current sensor 71 of one of the travel motors 70.

[0064] The second signal line 90 is an example of a signal line that transmits a signal for controlling the other loading motor 31 and the other traveling motor 70, which are the objects to be controlled. The second signal line 90 has a second main extension portion 91, a loading motor extension portion 92, and a traveling motor extension portion 93. The second main extension portion 91 is connected to the control device 40. The second main extension portion 91 extends along the right side wall 17. That is, the second signal line 90 has at least a portion that extends along the right side wall 17.

[0065] The loading motor extension portion 92 is continuous with the second main extension portion 91. The loading motor extension portion 92 is connected to the other loading motor 31. The loading motor extension portion 92 is disposed above the other loading motor 31. The loading motor extension portion 92 is connected to the current sensor 32 of the other loading motor 31.

[0066] The travel motor extension portion 93 is continuous with the second main extension portion 91. The travel motor extension portion 93 is connected to the other travel motor 70. The travel motor extension portion 93 is disposed above the other travel motor 70. The travel motor extension portion 93 is connected to the current sensor 71 of the other travel motor 70.

[0067] The first signal line 80 and the second signal line 90 are wirings for inputting signals output from the cargo handling motor 31 and the traveling motor 70, which are the objects to be controlled, to the control device 40. <Actions and Effects of the Present Embodiment> In this embodiment, the same actions and effects as in the first embodiment can be obtained.

[0068] <Example of change> The above-described embodiments can be modified as follows: The above-described embodiments and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0069] Signal lines such as the signal line 60, the first signal line 80, and the second signal line 90 do not have to be wiring for inputting signals output from the controlled objects, the loading motor 31 and the traveling motor 70, to the control device 40. For example, the signal lines may be wiring for controlling a control valve that opens and closes an oil passage for supplying hydraulic oil to a hydraulic cylinder. The control valve is a controlled object of the control device 40. The signal lines may be wiring for transmitting commands for controlling the controlled object from the control device 40 to the controlled object. In short, the signal lines may be wiring for transmitting signals for controlling the controlled object.

[0070] 5, the industrial vehicle 10 may be modified to include one cargo handling motor 31 and one travel motor 70. In this case, a first signal line 80 is used as the signal line. A second signal line 90 may also be used as the signal line.

[0071] The first supply line 51 of the power supply line 50 may also be accommodated in the accommodating recess 18a. The accommodating recess 18a of the bottom wall 18 may be omitted. In this case, the power supply line 50 may be modified to extend in the first direction A along the surface of the bottom wall 18 facing the inside of the vehicle body 11.

[0072] The distance D1 may be smaller than the distance D2. Distance D4 may be smaller than distance D5. The signal line 60, the first signal line 80, and the second signal line 90 may be modified so as to be connected to the traveling motor 70 instead of the cargo handling motor 31. The signal line 60, the first signal line 80, and the second signal line 90 may be modified so as to be connected to the cargo handling motor 31 instead of the traveling motor 70.

[0073] The signal lines such as the signal line 60, the first signal line 80, and the second signal line 90 may be connected to a lifting height sensor that detects the lifting height of the forks provided on the forklift, or a tilt angle sensor that detects the tilt angle of the mast. The signal lines may be connected to a reach sensor that detects the movement amount of the mast in the first direction A. The control device 40 controls the loading motor 31 and the traveling motor 70 based on the signals output from the lifting height sensor, the tilt angle sensor, and the reach sensor. Therefore, the signal lines may be appropriately changed as long as they transmit signals for controlling the loading motor 31 and the traveling motor 70, which are the objects to be controlled. The signal lines may be connected to the lifting height sensor, the tilt angle sensor, and the reach sensor, and may not be connected to the loading motor 31 and the traveling motor 70. In other words, the signal lines may not be connected to the objects to be controlled. The signal lines may be connected to the control device 40 and a sensor that outputs a signal for controlling the objects to be controlled.

[0074] The battery 20 may be disposed forward of the control device 40 on the vehicle body 11. The travel motor 70, the loading motor 31, the battery 20, and the control device 40 may be disposed in this order from the front of the vehicle body 11 to the rear of the vehicle body 11. The arrangement of the travel motor 70, the loading motor 31, the battery 20, and the control device 40 may be changed as appropriate.

[0075] The motor serving as the drive source for driving the industrial vehicle 10 may include, for example, a motor for driving the pair of rear wheels 14. In such a modification, the left front wheel 12 and the right front wheel 13 may be steered by a steering wheel (not shown) of the industrial vehicle 10, or may be driven by the travel motor 70 as in the above embodiments.

[0076] In each of the above embodiments, the locations of the current sensors 32, 71 may be changed as appropriate. For example, the current sensor 32 may be disposed on the third supply line 53, and the current sensor 71 may be disposed on the second supply line 52. In other words, the signal line 60 may have a portion that extends below the loading motor 31 and the traveling motor 70 so as to straddle the power supply line 50.

[0077] The controlled object may include an auxiliary device that assists in driving the industrial vehicle 10. In such a case, the power supply line 50 is modified so as to supply power to the auxiliary device. The cargo handling motor 31 and the traveling motor 70 may be three-phase AC motors. In such a modification, an inverter may be used as the electric circuit included in the control device 40. The second supply line 52 connects each phase of the traveling motor 70 to the inverter of the control device 40. Similarly, the third supply line 53 connects each phase of the cargo handling motor 31 to the inverter of the control device 40.

[0078] The industrial vehicle 10 may be an industrial vehicle such as a towing tractor or an unmanned guided vehicle that travels within a port. [Explanation of symbols]

[0079] 10...industrial vehicle, 11...body, 12...left front wheel, 13...right front wheel, 14...pair of rear wheels, 15...counterweight, 16...left side wall, 17...right side wall, 18...lower wall, 18a...accommodation recess, 20...battery, 30...hydraulic mechanism, 31...loading motor, 40...control device, 50...power supply line, 51...first supply line, 52...second supply line, 53...third supply line, 60...signal line, 70...travel motor, 80...first signal line, 90...second signal line, A...first direction, B...second direction, C...third direction, D1, D2, D3, D4, D5...distance.

Claims

1. An industrial vehicle having a battery housed in a vehicle body, A control device that controls a control target mounted on the industrial vehicle; a power supply line for supplying the power of the battery from the control device to the controlled object; a signal line connected to the control device and transmitting a signal for controlling the controlled object; the controlled object, the control device, the power supply line, and the signal line are accommodated in the vehicle body, The vehicle body is Side walls provided at the left and right ends of the vehicle body; A lower wall provided below the vehicle body, the power supply line has a portion extending in a front direction and a rear direction of the vehicle body along the lower wall, the signal line has at least a portion extending along the side wall, The industrial vehicle is a forklift equipped with a hydraulic mechanism, the controlled object includes a motor that serves as a drive source of the forklift, the motor is a travel motor for driving front wheels of the forklift and a loading motor for driving the hydraulic mechanism, The travel motor, the loading motor, the control device, and the battery are arranged in this order from the front of the vehicle body to the rear of the vehicle body, the power supply line connects the loading motor and the control device, and the travel motor and the control device; the signal line connects at least the loading motor and the control device, and the travel motor and the control device; The closest distance between the power supply line and the signal line is greater than the closest distance between the portion of the power supply line that extends along the lower wall and the loading motor, and the closest distance between the portion of the power supply line that extends along the lower wall and the traveling motor. Industrial vehicle.

2. The battery is accommodated in a counterweight disposed at the rearmost part of the vehicle body, The control device is disposed forward of the battery on the vehicle body, The signal line is provided forward of the battery on the vehicle body. The industrial vehicle according to claim 1.

3. The lower wall is provided with an accommodating recess that is recessed downward and extends in the front and rear directions of the vehicle body, A portion of the power supply line extending in the front and rear directions of the vehicle body along the lower wall is accommodated in the accommodation recess.

3. The industrial vehicle according to claim 1 or 2.

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