Lorry

Abstract

To provide a motor truck allowing a worker to easily visually recognize a loading weight when loading earth and sand or the like into a cargo box, and easily preventing the motor truck from traveling while displaying the loading weight after loading work.SOLUTION: The truck 1 includes a weight meter 40 for measuring the weight of the load loaded in the cargo box 30, and a display 50 for displaying the weight of the load measured by the weight meter 40. The display 50 is installed on an upper portion of the front wall 32 of the cargo box 30 so as to face rearward. The motor truck 1 includes a notification device 55 that notifies the driver whether the display 50 displays the weight of the load during traveling.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a truck equipped with a weighing scale for measuring the load weight. [Background technology]

[0002] Trucks equipped with weighing scales that measure the weight of cargo in a cargo box (hereinafter also referred to as load weight) have been known for some time. Trucks equipped with weighing scales can accurately determine whether the actual load weight exceeds a predetermined maximum load weight, thereby preventing the truck from traveling in an overloaded state. Patent Document 1 discloses an off-road vehicle equipped with a calculation device that calculates the load mass of a cargo box and an alarm device that notifies the driver when the load mass is equal to or greater than the maximum load mass. In this off-road vehicle, the load mass of the cargo box is displayed on an alarm device located in the driver's cab. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6527486 Summary of the Invention [Problem to be solved by the invention]

[0004] When loading earth and sand into the cargo box of a truck using a hydraulic excavator or wheel loader, the loading operation is performed from the rear or side of the cargo box. If a display showing the load weight is located inside the driver's cab, the worker performing the loading operation cannot know the load weight while working. As a result, there are cases where the worker loads earth and sand exceeding the maximum load weight into the cargo box, and then later realizes that the cargo box is overloaded and has to reduce the load weight.

[0005] Therefore, it is conceivable to install a display that displays the load weight on the upper part of the front wall of the cargo box. By installing the display on the upper part of the front wall of the cargo box, workers performing loading work at the rear or side of the cargo box can easily see the display while working. Therefore, workers can load earth and sand while checking the load weight.

[0006] However, the upper part of the front wall of the cargo box is a location that is easily noticeable to the driver of a vehicle traveling behind the freight truck (hereinafter referred to as the following vehicle). If a display is installed on the upper part of the front wall of the cargo box and is configured to always display the load weight, it will attract the attention of the driver of the following vehicle when the freight truck is traveling with earth and sand or other loads. Even if the display is configured to be switchable on and off, workers may forget to turn the display off, causing the freight truck to continue traveling with the display on. In such cases, it will attract the attention of the driver of the following vehicle.

[0007] Since the display is for the workers who perform the loading work, it is unnecessary when loading work is not being performed, and it is better to turn it off. However, forcing them to turn it off would be a hassle for the truck driver. The workers who perform the loading work are in a relatively high place, so the display installed at the top of the front wall of the cargo box is easy to see, but it cannot be seen directly by the driver who is in the truck cab, so it is difficult for the driver to notice even if the display is on.

[0008] The present invention has been made in consideration of the above points, and its purpose is to provide a freight truck that allows an operator to easily visually check the load weight when loading earth and sand into a cargo box, while also making it easy to prevent the truck from driving away with the load weight displayed after the loading operation. [Means for solving the problem]

[0009] A freight truck according to the present invention comprises a vehicle body, a cargo box attached to the vehicle body and having a bottom plate and a front wall erected from the front end of the bottom plate, a weighing scale for measuring the weight of cargo loaded in the cargo box, and a display for displaying the weight of the cargo measured by the weighing scale. The display is installed on an upper part of the front wall of the cargo box so as to face rearward. The freight truck is equipped with a notification device for notifying the driver whether the display is displaying the weight of the cargo while the truck is traveling.

[0010] In the above-described freight truck, the weight of the cargo (load weight) measured by the weighing scale is displayed on a display installed facing rearward on the upper part of the front wall of the cargo box. Therefore, workers can easily see the display when loading earth and sand into the cargo box. Therefore, workers can easily know the load weight during loading operations. Furthermore, in the above-described freight truck, if the display shows the load weight while the truck is traveling, a notification device notifies the driver. By receiving this notification, the driver can recognize that the display is showing the load weight, and can stop the display by, for example, turning off the display. Therefore, it is easy to prevent the freight truck from traveling with the load weight displayed after loading operations.

[0011] Another freight vehicle according to the present invention comprises a vehicle body, a cargo box attached to the vehicle body and having a bottom plate and a front wall erected from the front end of the bottom plate, a weighing scale for measuring the weight of cargo loaded in the cargo box, and a display for displaying the weight of the cargo measured by the weighing scale. The display is installed on an upper part of the front wall of the cargo box so as to face rearward. The freight vehicle further comprises a weight display prohibiting device for prohibiting the display from displaying the weight of the cargo at least while the vehicle is moving.

[0012] According to the above-mentioned freight truck, the display is prohibited from displaying the load weight while the truck is moving. The display is installed on the top of the front wall of the cargo box facing backward, making it easily visible to the drivers of following vehicles, but the load weight is not displayed on the display while the truck is moving. Therefore, according to the above-mentioned freight truck, when the cargo box is loaded with earth or sand, it is difficult to attract the attention of the drivers of following vehicles.

[0013] According to a preferred aspect of the present invention, the vehicle body has a pivotal support portion that pivotally supports the rear portion of the cargo box and a seating portion that supports the bottom of the cargo box. The cargo box is configured to be pivotable between a seating position where the bottom of the cargo box is supported by the seating portion and a spaced position where the bottom of the cargo box is spaced from the seating portion. The truck is equipped with a cargo box position detection device that detects when the cargo box is in the seating position. The weight display prohibition device has a first display prohibition portion that prohibits the display from displaying the weight of the load when the cargo box position detection device detects that the cargo box is in the seating position.

[0014] In a freight truck with a tiltable cargo box, the cargo box is tilted when unloading earth and sand, but the cargo box is kept in the seated position while driving. According to the above-described embodiment, when it is detected that the cargo box is in the seated position, the display is prohibited from displaying the load weight. This prevents the display from displaying the load weight while the freight truck is driving. Therefore, when driving with earth and sand loaded in the cargo box, it is difficult to attract the attention of the driver of a following vehicle.

[0015] There is no particular limitation on the method for detecting whether the cargo box is in the seating position. The cargo vehicle may include a hydraulic cylinder that rotates the cargo box, and the cargo box position detection device may detect the oil pressure of the hydraulic cylinder and detect that the cargo box is in the seating position when the oil pressure of the hydraulic cylinder is lower than a threshold value.

[0016] According to a preferred aspect of the present invention, the vehicle body includes a drive source that generates power, wheels that rotate by receiving power from the drive source, mounted equipment that operates by receiving the power, and a power take-off device that transmits power from the drive source to the mounted equipment. The truck includes a power take-off detection device that detects whether the power take-off device is ON or OFF. The weight display prohibition device includes a second display prohibition section that prohibits the display from displaying the weight of the load when the power take-off detection device detects that the power take-off device is ON.

[0017] According to one aspect, when loading cargo into the cargo box, the power take-off device is turned off. When the power take-off device is turned on, it is not necessary to display the load weight on the display. According to this aspect, unnecessary display of the load weight on the display can be avoided.

[0018] According to a preferred aspect of the present invention, the cargo box has a tailgate that can be rotated between a closed position where it stands up from the rear end of the bottom plate and an open position that is inclined or perpendicular to the closed position. The truck is equipped with a manual locking mechanism that holds the tailgate in the closed position and a manual lock detection device that detects whether the manual locking mechanism is ON or OFF. The weight display prohibiting device has a third display prohibiting unit that prohibits the display from displaying the weight of the load when the manual lock detection device detects that the manual locking mechanism is OFF.

[0019] The manual locking mechanism of the tailgate is ON when the freight truck is traveling, but is also ON when loading earth and sand into the cargo box. On the other hand, when unloading earth and sand from the cargo box, the manual locking mechanism is OFF, and the tailgate can be rotated from the closed position to the open position. When the manual locking mechanism is OFF, there is no need to display the load weight on the display. According to the above aspect, when it is detected that the manual locking mechanism is OFF, the display is prohibited from displaying the load weight. Therefore, the display can be prevented from displaying the load weight not only when the freight truck is traveling, but also when the truck is stopped and earth and sand are not being loaded into the cargo box. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a freight truck that allows a worker to easily visually check the load weight when loading earth and sand or the like into a shipping box, and that can easily prevent the truck from driving away with the load weight displayed after loading work has been completed. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a side view of a truck with a cargo box in a seated position. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 1 is a side view of a truck with a cargo box in a tilted position. [Figure 5] FIG. 2 is a circuit diagram of the main parts of a hydraulic circuit. [Figure 6] FIG. [Figure 7] FIG. 1 is a side view of a truck with the cargo box in the separated position. [Figure 8] FIG. 1 is a block diagram of a system for displaying a load weight. [Figure 9] FIG. 2 is a block diagram of a weight display prohibition device and various detection devices. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side view of a freight vehicle 1 according to this embodiment. Fig. 2 is a plan view of the freight vehicle 1, and Fig. 3 is a rear view of the freight vehicle 1.

[0023] As shown in FIG. 1, the truck 1 includes a chassis frame 2, a cab (driver's compartment) 3 supported by the chassis frame 2, front and rear wheels 5 and 6 supported by the chassis frame 2, a subframe 7 disposed behind the cab 3 and on the chassis frame 2, and a cargo box 30 supported by the subframe 7. The truck 1 also includes an engine 9 as a drive source for generating power, and a power take-off device (hereinafter referred to as PTO) 10. In this embodiment, the front and rear wheels 5 and 6 are an example of wheels that rotate upon receiving power from the drive source. The chassis frame 2, the cab 3, the subframe 7, the engine 9, and the PTO 10 constitute a vehicle body 1A. A driver's seat (not shown) is provided inside the cab 3. In the following description, unless otherwise specified, the terms front, rear, left, right, up, and down refer to the front, rear, left, right, up, and down as seen from the driver sitting in the driver's seat.

[0024] The freight vehicle 1 according to this embodiment is a so-called dump truck, and the cargo box 30 is configured to be tiltable. As shown in FIG. 1, the rear of the cargo box 30 is rotatably supported on the rear end of the subframe 7 by a hinge shaft 8 extending in the vehicle width direction. The vehicle body 1A has a rotation support portion 13 that rotatably supports the rear of the cargo box 30. FIG. 4 is a side view of the freight vehicle 1 when the cargo box 30 is tilted. The freight vehicle 1 is equipped with a hydraulic cylinder 25 that rotates the cargo box 30. The hydraulic cylinder 25 is connected to a dump mechanism 26 that is connected to the vehicle body 1A and the cargo box 30. The hydraulic cylinder 25 rotates the cargo box 30 via the dump mechanism 26.

[0025] As shown in FIG. 5, the truck 1 is equipped with a hydraulic circuit 20 incorporating a hydraulic cylinder 25. In addition to the hydraulic cylinder 25, the hydraulic circuit 20 has an oil tank 21, a hydraulic pump 22, and a switching valve (not shown). The PTO 10 extracts power from the engine 9 and transmits the power to the hydraulic pump 22. In the hydraulic circuit 20, by appropriately switching the switching valve, oil pressurized by the hydraulic pump 22 is supplied to the hydraulic cylinder 25. This drives the hydraulic cylinder 25, causing the cargo box 30 to rotate around the hinge shaft 8 (see FIG. 4). In this embodiment, the hydraulic pump 22 is an example of mounted equipment that operates by receiving power from the engine 9.

[0026] 1 and 2, the cargo box 30 has a bottom plate 31, a front wall 32 standing from the front end of the bottom plate 31, a left wall 33 standing from the left end of the bottom plate 31, a right wall 34 standing from the right end of the bottom plate 31, and a tailgate 35. The front wall 32 extends upward from the front end of the bottom plate 31. The front wall 32 extends upward to a position higher than any of the left wall 33, the right wall 34, and the tailgate 35. As shown in FIG. 1, for example, the front wall 32 extends upward to a position higher than the top end of the cab 3.

[0027] The tailgate 35 is configured to be rotatable about a hinge shaft 37 extending in the left-right direction. The tailgate 35 is rotatable between a closed position in which it stands up from the rear end of the bottom plate 31 and an open position inclined or perpendicular to the closed position. In FIG. 4 , the state of the tailgate 35 in the closed position is represented by a solid line, and the state of the tailgate 35 in the open position is represented by a phantom line. When the tailgate 35 is in the closed position, the rear of the cargo box 30 is closed. When the tailgate 35 is in the open position, the cargo box 30 is opened rearward. When earth or sand is to be discharged from the cargo box 30, the cargo box 30 is tilted, and the tailgate 35 is rotated to the open position. This allows the cargo box 30 to be opened rearward, allowing earth or sand to be smoothly discharged from the cargo box 30.

[0028] FIG. 6 is a rear view of the cargo box 30. However, the front wall 32 is not shown in FIG. 6. As shown in FIG. 6, a hook 39 is provided on the rear surface of the bottom plate 31 of the cargo box 30. The tailgate 35 is provided with a locking bar 38 extending in the left-right direction, to which the hook 39 can be locked. The hook 39 is connected to a lever (not shown). An operator can manually operate the lever to lock or unlock the hook 39 to the locking bar 38. When the hook 39 is locked to the locking bar 38, the tailgate 35 cannot rotate around the hinge shaft 37, and the tailgate 35 is held in the closed position. When the hook 39 is released from the locking bar 38, the tailgate 35 can be rotated from the closed position to the open position. The hook 39 and the locking bar 38 constitute a manual locking mechanism 36 that holds the tailgate 35 in the closed position.

[0029] As shown in FIG. 1, the vehicle body 1A has a seat 11 that supports the bottom of a cargo box 30. The seat 11 is provided on a subframe 7. As shown in FIG. 1, when the cargo box 30 is in a horizontal position, the bottom of the cargo box 30 is supported by the seat 11. Specifically, the cargo box 30 is provided with a bottom plate 31 and a main girder 31a that reinforces the bottom plate 31, and the main girder 31a is supported by the seat 11. On the other hand, as shown in FIG. 7, when the cargo box 30 is tilted by rotating it about the hinge shaft 8, the bottom of the cargo box 30 moves away from the seat 11. Hereinafter, the position of the cargo box 30 when the bottom of the cargo box 30 is supported by the seat 11 will be referred to as the seating position, and the position of the cargo box 30 when the bottom of the cargo box 30 is separated from the seat 11 will be referred to as the separated position.

[0030] The truck 1 is equipped with a weighing scale 40 (see FIG. 8 ) that measures the weight of the cargo loaded in the cargo box 30 (hereinafter referred to as the load weight). The weighing scale 40 according to this embodiment measures the weight of the cargo box 30 loaded with the cargo (i.e., the sum of the weight of the cargo box 30 itself and the weight of the cargo), and calculates the weight of the cargo by subtracting the weight of the cargo box 30 itself from the weight of the loaded cargo. The weight of the cargo box 30 itself is specified in advance. Therefore, measuring the weight of the cargo box 30 loaded with the cargo and measuring the load weight are technically equivalent matters. In this specification, measuring the load weight includes measuring the load weight itself and measuring a weight that is correlated with the load weight (in the above example, the weight of the cargo box 30 loaded with the cargo). In other words, measuring the load weight includes measuring any weight that can identify the load weight.

[0031] In this embodiment, weighing scale 40 is a load cell type weighing scale or a weighing scale that calculates the load weight based on the hydraulic pressure of hydraulic cylinder 25. However, there are no limitations on the type or configuration of weighing scale 40, and any weighing scale that has conventionally been used to measure the load weight of a cargo box on a freight vehicle can be used.

[0032] When weighing scale 40 is a load cell type, if packing box 30 is supported on seat 11 (see FIG. 1), part of the weight of packing box 30 is applied to seat 11. As a result, the entire weight of packing box 30 is not applied to weighing scale 40, and weighing scale 40 cannot accurately measure the weight of packing box 30. Also, even if weighing scale 40 is a weighing scale that calculates the load weight based on the hydraulic pressure of hydraulic cylinder 25, if packing box 30 is supported on seat 11, the load is applied to seat 11, and the load applied to hydraulic cylinder 25 becomes smaller (or is not applied at all). As a result, the weight of packing box 30 cannot be accurately measured. Therefore, when weighing scale 40 is a load cell type weighing scale or a weighing scale that calculates the load weight based on the hydraulic pressure of hydraulic cylinder 25, the load weight is measured with packing box 30 rotated to the separated position, as shown in FIG. 7. In other words, the load weight is measured with packing box 30 separated from seat 11.

[0033] As shown in FIG. 3 , a display 50 is provided on the upper part of the front wall 32 of the cargo box 30. The upper part of the front wall 32 refers to the part above the vertical center position of the front wall 32. The display 50 is provided facing rearward. Specifically, the display 50 includes a case 51 and a display panel 52, and the display panel 52 is provided at the rear of the case 51. In this embodiment, the display 50 is provided at the upper end of the front wall 32 of the cargo box 30. The display 50 is also provided at the center of the front wall 32 of the cargo box 30 in the vehicle width direction. The display 50 is disposed on the vehicle centerline. Therefore, the display 50 is disposed in a location that is easily visible to workers performing loading work behind or to the side of the cargo box 30. By looking at the display 50, the workers can easily grasp the load weight of the cargo box 30 in real time (in other words, in real time) while performing loading work of earth and sand, etc.

[0034] The dimensions of the display 50 are not particularly limited, but are preferably large enough to be visible to an operator. The horizontal dimension of the display 50 may be, for example, 300 mm or more, 400 mm or more, or 500 mm or more. The vertical dimension of the display 50 may be, for example, 100 mm or more, 150 mm or more, or 200 mm or more.

[0035] Incidentally, since the display 50 is installed in a location that is easily visible from the rear, if the display 50 displays the load weight while the truck 1 is traveling with a load of earth and sand, it will attract the attention of the driver of the following vehicle. In particular, if the weight measured by the weighing scale 40 fluctuates slightly due to vibrations during travel, the load weight displayed on the display 50 will change frequently, attracting the attention of the driver of the following vehicle. Even if the display 50 is configured to display the load weight continuously, or even if the display 50 is configured to be turned on and off, the operator or driver may forget to turn off the display 50, causing the truck 1 to travel with the load weight displayed on the display 50. Therefore, the truck 1 according to this embodiment is configured to notify the driver whether the display 50 is displaying the load weight while traveling. Furthermore, the truck 1 is configured to prohibit the display 50 from displaying the load weight while traveling after a loading operation.

[0036] As shown in FIG. 8, in the freight truck 1 according to this embodiment, the display 50 is connected to a notification device 55. The notification device 55 is a device that notifies the driver whether or not the display 50 is displaying the load weight, and is arranged inside the cab 3 (see FIG. 1). The notification device 55 may be a device that notifies by light, image, sound, or the like, and may be, for example, an LED lamp, a liquid crystal display device, a speaker, or the like. As an example in which the communication device 55 is configured by a liquid crystal display device, it may be one that displays the load weight and other information on a screen when the display 50 is ON.

[0037] In addition, in the freight truck 1 according to this embodiment, the display 50 is communicatively connected to the weighing scale 40 via a weight display prohibiting device 60. The weight display prohibiting device 60 is configured, for example, by a computer. The weight display prohibiting device 60 allows the display 50 to display the load weight at least during the loading of soil or sand into the packing box 30. The weight display prohibiting device 60 receives a signal from the weighing scale 40 and information about the load weight from the weighing scale 40 at least during the loading of soil or sand into the packing box 30. The weight display prohibiting device 60 also outputs a signal to the display 50 and transfers information about the load weight to the display 50 at least during the loading of soil or sand into the packing box 30. A worker performing the loading operation can continuously know the load weight by looking at the display 50. Meanwhile, the weight display prohibiting device 60 prohibits the display 50 from displaying the load weight at least while the freight truck 1 is traveling after the loading operation. The weight display prohibiting device 60 may be configured to turn off the display 50 at least while the freight vehicle 1 is traveling after loading work.

[0038] According to this embodiment, the display 50 is prevented from displaying the load weight while the truck 1 is traveling after loading. Therefore, when the truck 1 is traveling with earth and sand loaded in the cargo box 30, it is possible to make it less likely to attract the attention of the driver of a following vehicle. Furthermore, since the traveling time is overwhelmingly longer than the time required for the earth and sand loading operation, if unnecessary displays are displayed while traveling, the batteries or light bulbs of the display 50 may be quickly depleted, and it may become impossible to display the required information when earth and sand are being loaded. However, according to this embodiment, this can be prevented.

[0039] As described above, in this embodiment, when measuring the load weight, the cargo box 30 is held in the separated position (see FIG. 7). The work of loading earth and sand into the cargo box 30 is carried out with the cargo box 30 held in the separated position. On the other hand, when the freight vehicle 1 is traveling, the cargo box 30 is held in the seated position (see FIG. 1). As shown in FIG. 9, the cargo vehicle 1 according to this embodiment is equipped with a cargo box position detection device 71 that detects that the cargo box 30 is in the seated position.

[0040] The configuration of the cargo box position detection device 71 is not particularly limited. The cargo box position detection device 71 may be configured, for example, as a limit switch or an optical sensor that turns on / off when the cargo box 30 moves to the seating position. Furthermore, when the cargo box 30 moves to the seating position, most of the load of the cargo box 30 is supported by the seating portion 11 of the vehicle body 1A, thereby reducing the load weight measured by the weigh scale 40. Therefore, the cargo box position detection device 71 may be configured to detect that the cargo box 30 is in the seating position based on the load weight measured by the weigh scale 40 being equal to or less than a predetermined threshold. Furthermore, when the cargo box 30 moves to the seating position, the load on the hydraulic cylinder 25 decreases. Therefore, the cargo box position detection device 71 may be configured to detect the oil pressure of the hydraulic cylinder 25 and detect that the cargo box 30 is in the seating position based on the oil pressure of the hydraulic cylinder 25 being lower than a predetermined threshold.

[0041] As shown in Figure 9, the weight display prohibiting device 60 according to this embodiment is communicatively connected to a cargo box position detecting device 71 and is configured to receive signals from the cargo box position detecting device 71. The weight display prohibiting device 60 has a display prohibiting unit 61 that prohibits the display 50 from displaying the load weight when the cargo box position detecting device 71 detects that the cargo box 30 is in the seating position. Therefore, when the cargo box 30 is in the seating position, the display of the load weight by the display 50 is prohibited. This prevents the load weight from being displayed on the display 50 while the freight truck 1 is traveling.

[0042] The freight truck 1 is also equipped with a parking brake 12 (see FIG. 9). Loading work of earth and sand into the cargo box 30 may be performed with the parking brake 12 OFF (for example, in asphalt stripping work, loading is performed while traveling alongside a road cutter), but there may be cases where it is preferable to perform the work while the truck is stopped, and the work may be performed with the parking brake 12 ON. When the parking brake 12 is ON, the freight truck 1 remains stopped. On the other hand, when the freight truck 1 is traveling after loading work, the parking brake 12 is OFF. As shown in FIG. 9, the freight truck 1 according to this embodiment is equipped with a parking brake detection device 72 that detects whether the parking brake 12 is ON or OFF.

[0043] The weight display prohibiting device 60 is communicatively connected to the parking brake detection device 72 and is configured to receive a signal from the parking brake detection device 72. The weight display prohibiting device 60 may have a display prohibiting unit 62 that prohibits the display of the load weight on the display 50 when the parking brake detection device 72 detects that the parking brake 12 is OFF. In this case, the display of the load weight on the display 50 is prohibited when the parking brake 12 is OFF. This makes it possible to prevent the load weight from being displayed on the display 50 while the freight truck 1 is traveling after a loading operation.

[0044] The loading of earth and sand into the cargo box 30 may be performed while the truck 1 is moving slowly (for example, in the case of the asphalt removal work mentioned above), but it may also be performed while the truck 1 is stopped. In this case, the loading of earth and sand into the cargo box 30 is performed while the truck 1 is traveling at zero speed. On the other hand, when the truck 1 is traveling, the traveling speed is greater than zero. The truck 1 is equipped with a speed detection device 73 that measures the traveling speed.

[0045] The weight display prohibiting device 60 may have a display prohibiting section 63 that prohibits the display 50 from displaying the load weight when the speed detection device 73 detects that the traveling speed of the freight truck 1 is not zero. This makes it possible to prevent the load weight from being displayed on the display 50 while the freight truck 1 is traveling after loading work.

[0046] As described above, when work is performed using mounted equipment such as the hydraulic pump 22, the power of the engine 9 is transmitted to the mounted equipment via the PTO 10. That is, the PTO 10 extracts the power of the engine 9 and transmits it to the mounted equipment. Hereinafter, when the PTO 10 extracts the power of the engine 9, it will be referred to as the PTO 10 being ON, and when the PTO 10 does not extract the power of the engine 9, it will be referred to as the PTO 10 being OFF. When driving the hydraulic pump 22, the PTO 10 is turned ON. When the truck 1 is traveling, the power of the engine 9 is transmitted to the front wheels 5 or the rear wheels 6, but not to the mounted equipment. When the truck 1 is traveling, the PTO 10 is turned OFF. The PTO 10 is also turned OFF when earth and sand are loaded into the cargo box 30 with the cargo box 30 tilted. In this embodiment, the PTO 10 is turned on only when the cargo box 30 is moved, and is turned on when the truck is slightly dumped to the weighing position shown in Fig. 7 or when the truck is fully dumped to unload earth and sand. As shown in Fig. 9, the truck 1 is equipped with a power take-off detection device 74 that detects whether the PTO 10 is on or off.

[0047] The weight display prohibiting device 60 has a display prohibiting section 64 that prohibits the display of the load weight on the display 50 when the power takeoff detection device 74 detects that the PTO 10 is turned on. Therefore, when the PTO 10 is turned on, the display of the load weight on the display 50 is prohibited. Therefore, unnecessary display of the load weight on the display 50 is avoided.

[0048] Incidentally, in the freight truck 1, there is no need to display the load weight on the display 50 not only when traveling but also when unloading earth and sand from the cargo box 30. In the freight truck 1, when loading earth and sand into the cargo box 30, the manual locking mechanism 36 of the tailgate 35 (see FIG. 6) is turned ON. Here, turning the manual locking mechanism 36 ON means that the tailgate 35 is held in the closed position, and turning the manual locking mechanism 36 OFF means that the tailgate 35 is rotatable. Note that the manual locking mechanism 36 of the tailgate 35 is also turned ON when the freight truck 1 is traveling. On the other hand, when tilting the cargo box 30 to unload earth and sand loaded in the cargo box 30, the manual locking mechanism 36 of the tailgate 35 is turned OFF, making the tailgate 35 rotatable. When the manual locking mechanism 36 is OFF, there is no need to display the load weight on the display 50. As shown in FIG. 9, the freight truck 1 is equipped with a manual lock detection device 75 that detects whether the manual locking mechanism 36 is ON or OFF.

[0049] The weight display prohibiting device 60 has a display prohibiting section 65 that prohibits the display 50 from displaying the load weight when the manual lock detecting device 75 detects that the manual locking mechanism 36 is OFF. Therefore, when the manual locking mechanism 36 is OFF, the display of the load weight by the display 50 is prohibited. This prevents the display 50 from displaying the load weight when earth and sand are being discharged from the packing box 30. Unnecessary displays by the display 50 can be prevented.

[0050] As described above, in the freight truck 1 according to this embodiment, the load weight measured by the weighing scale 40 is displayed on the display 50, which is installed facing rearward on the upper portion of the front wall 32 of the cargo box 30. Therefore, when loading earth and sand into the cargo box 30 using a hydraulic excavator, a wheel loader, or the like, the worker can easily see the display 50. Therefore, the worker can easily know the load weight sequentially during the loading operation. Furthermore, in the freight truck 1 according to this embodiment, if the display 50 displays the load weight while the vehicle is traveling, the notification device 55 notifies the driver. By receiving this notification, the driver can recognize that the display 50 is displaying the load weight and can stop the display by, for example, turning off the display 50. This easily prevents the freight truck 1 from traveling with the load weight displayed after the loading operation. This also prevents the premature wear of the batteries or light bulbs in the display 50.

[0051] Furthermore, although the display 50 is placed in a location that is easily noticeable to the driver of the following vehicle, this embodiment can prevent the freight truck 1 from traveling with the load weight still displayed on the display 50 after loading work. Therefore, the freight truck 1 according to this embodiment is less likely to attract the attention of the driver of the following vehicle when traveling with the cargo box 30 loaded with earth and sand or the like.

[0052] While one embodiment of the present invention has been described above, the embodiment is merely an example. The present invention can be embodied in various other forms. Other exemplary embodiments will be briefly described below.

[0053] In the above embodiment, weight display prohibiting device 60 has display prohibiting units 61 to 65, but at least one of display prohibiting unit 64 and display prohibiting unit 65 may be omitted. Furthermore, weight display prohibiting device 60 may have only one, two, or three of display prohibiting units 61 to 64. Weight display prohibiting device 60 may have other display prohibiting units instead of display prohibiting units 61 to 64.

[0054] The weight display prohibiting device 60 is only required to be configured to prohibit the display 50 from displaying the load weight at least while the freight truck 1 is traveling after loading work, and is not limited to being configured to turn off the display 50. For example, the weight display prohibiting device 60 may be configured to allow the display 50 to display a display that is unlikely to attract the attention of the driver of a following vehicle (for example, a constant display with no changing display content) while the freight truck 1 is traveling after loading work.

[0055] The freight vehicle 1 may be provided with a display other than the display 50 installed on the upper part of the front wall 32 of the cargo box 30 as a device for displaying the load weight. For example, the freight vehicle 1 may be provided with another display inside the cab 3 in addition to the display 50 that displays the load weight. The other display may or may not display the load weight while the freight vehicle 1 is traveling.

[0056] In the above embodiment, the freight vehicle 1 is a dump truck with a tiltable cargo box 30, but the freight vehicle according to the present invention may also be a freight vehicle with a non-tiltable cargo box. The freight vehicle 1 does not have to be equipped with a manual locking mechanism 36 that holds the tailgate 35 in a closed position. Furthermore, the cargo box 30 of the freight vehicle 1 does not have to have a rotatable tailgate 35. The freight vehicle does not have to be equipped with a power take-off device. The driving source of the freight vehicle is not limited to the engine 9, but may also be an electric motor. [Explanation of symbols]

[0057] 1 lorry 1A Vehicle body 5 Front wheels 6 Rear wheel (wheel) 9 Engine (power source) 10 Power take-off device 11 Seating area 13 Rotation support part 22 Hydraulic pump (mounting equipment) 30 packing boxes 31 Bottom plate 32 Front wall 35 Tailgate 36 Manual locking mechanism 40 Weight scale 50 Display 60 Weight display prohibition device

Claims

1. The vehicle body, a cargo box provided on the vehicle body and having a bottom plate and a front wall standing upright from a front end of the bottom plate; a weighing scale for measuring the weight of the cargo loaded in the packing box; a display that displays the weight of the load measured by the weighing scale, The indicator is installed on an upper portion of the front wall of the packing box so as to face rearward, The freight vehicle is provided with a notification device that notifies the driver whether or not the display is displaying the weight of the load while the vehicle is traveling.

2. The vehicle body, a cargo box provided on the vehicle body and having a bottom plate and a front wall standing upright from a front end of the bottom plate; a weighing scale for measuring the weight of the cargo loaded in the packing box; a display that displays the weight of the load measured by the weighing scale, The indicator is installed on an upper portion of the front wall of the packing box so as to face rearward, The freight vehicle is provided with a weight display prohibiting device that prohibits the display from displaying the weight of the load at least while the vehicle is traveling.

3. The vehicle body has a rotation support part that rotatably supports a rear part of the cargo box, and a seat part that supports a bottom part of the cargo box, The packing box is configured to be rotatable between a seating position where the bottom of the packing box is supported by the seating portion and a spaced position where the bottom of the packing box is spaced from the seating portion, a luggage box position detection device for detecting that the luggage box is in the seating position; 3. The truck according to claim 2, wherein the weight display prohibiting device has a first display prohibiting section that prohibits the display from displaying the weight of the load when the cargo box position detecting device detects that the cargo box is in the seating position.

4. A hydraulic cylinder is provided to rotate the packing box, 4. The truck according to claim 3, wherein the cargo box position detection device detects the oil pressure of the hydraulic cylinder and detects that the cargo box is in the seating position when the oil pressure of the hydraulic cylinder is lower than a threshold value.

5. The vehicle body has a drive source that generates power, wheels that rotate by receiving power from the drive source, mounted equipment that operates by receiving the power, and a power take-off device that transmits power from the drive source to the mounted equipment, a power take-off detection device for detecting ON / OFF of the power take-off device; A freight truck as described in any one of claims 2 to 4, wherein the weight display prohibition device has a second display prohibition section that prohibits the display from displaying the weight of the load when the power take-off detection device detects that the power take-off device is turned on.

6. The cargo box has a tailgate that can be rotated between a closed position where the tailgate stands upright from the rear end of the bottom plate and an open position that is inclined or perpendicular to the closed position, a manual locking mechanism that holds the tailgate in the closed position; a manual lock detection device that detects ON / OFF of the manual lock mechanism, A freight truck as described in any one of claims 2 to 5, wherein the weight display prohibition device has a third display prohibition section that prohibits the display from displaying the weight of the cargo when the manual lock detection device detects that the manual lock mechanism is OFF.

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