JP7788853B2 - lorry - Google Patents

Description

The present invention relates to a freight vehicle equipped with a weighing scale that measures the load weight.

Freight vehicles equipped with weighing scales that measure the weight of cargo in cargo boxes (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, preventing the vehicle 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 the cargo box and an alarm device that issues an alarm when the load mass is equal to or exceeds 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.

Patent No. 6527486

When loading earth and sand into the cargo box of a freight vehicle, the loading operation using a hydraulic excavator or wheel loader is carried out from the rear or side of the cargo box. If the display showing the load weight is located inside the driver's cab, the worker performing the loading operation will not be able to know the load weight while working. As a result, there are cases where the worker loads more earth and sand than the maximum load weight into the cargo box, then later realizes that the box is overloaded and has to take action to reduce the load weight.

One solution is to install a display that shows the load weight on the top of the front wall of the cargo box. By installing the display on the top 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. This allows workers to load soil and sand while checking the load weight.

However, the top of the front wall of the cargo box is a location that is easily noticeable to drivers of vehicles traveling behind the freight truck (hereinafter referred to as the following vehicle). If a display is installed on the top 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 a load of earth or sand. Even if the display is configured to be able to be switched 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.

The display is for the workers performing the loading work, so 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 performing the loading work are in a relatively high position, 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 inside the truck cab, so it is difficult for the driver to notice even if the display is on.

The present invention was made in consideration of these issues, and its purpose is to provide a freight truck that allows workers to easily visually check the load weight when loading earth and sand into the shipping box, while also making it easy to prevent the truck from driving away with the load weight still displayed after loading.

One 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 rising 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 the top of the front wall of the cargo box so as to face rearward. The freight vehicle is equipped with a notification device for notifying the driver whether the display is displaying the weight of the cargo while the vehicle is traveling.

With the above-mentioned freight truck, the weight of the cargo (load weight) measured by the weighing scale is displayed on a display installed facing rearward on the top of the front wall of the cargo box. This allows workers to easily see the display when loading soil or sand into the cargo box. This allows workers to easily know the load weight during loading operations. Furthermore, with the above-mentioned freight truck, if the display shows the load weight while the vehicle is in motion, 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 turning off the display, for example. This makes it easy to prevent the freight truck from driving away with the load weight still displayed after loading operations.

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 rising 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 the top of the front wall of the cargo box facing 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.

With 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 drivers of following vehicles, but the load weight is not displayed on the display while the truck is moving. Therefore, with the above-mentioned freight truck, it is difficult to attract the attention of drivers of following vehicles when driving with the cargo box loaded with earth and sand, etc.

According to a preferred aspect of the present invention, the vehicle body has a pivotal support section that rotatably supports the rear of the cargo box, and a seating section 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 section, and a spaced position where the bottom of the cargo box is spaced apart from the seating section. 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 section 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.

In freight trucks with tiltable cargo boxes, the cargo box is tilted when unloading soil or sand, but is kept in a seated position when driving. According to the above-described configuration, when the cargo box is detected to be in a 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 soil or sand loaded in the cargo box, it is less likely to attract the attention of the driver of a following vehicle.

There are no particular limitations on the method for detecting whether the cargo box is in the seating position. The truck may be equipped with 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 based on whether the oil pressure of the hydraulic cylinder is lower than a threshold value.

According to a preferred aspect of the present invention, the vehicle body includes a drive source that generates power, wheels that rotate upon receiving power from the drive source, mounted equipment that operates upon receiving the power, and a power take-off device that transmits power from the drive source to the mounted equipment. The truck is equipped with 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.

According to one aspect, the power take-off device is turned OFF when loading cargo into the cargo box. When the power take-off device is ON, there is no need to display the load weight on the display. This aspect avoids unnecessary display of the load weight on the display.

According to a preferred aspect of the present invention, the cargo box has a tailgate that can be rotated between a closed position in which 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 prohibition device has a third display prohibition section 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.

The manual locking mechanism of the tailgate is ON when the freight truck is traveling, but it is also ON when earth or sand is being loaded into the cargo box. On the other hand, when earth or sand is being unloaded from the cargo box, the manual locking mechanism is OFF, allowing the tailgate to 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 load weight can be prevented from being displayed on the display not only when the freight truck is traveling, but also when the truck is stopped and earth or sand is not being loaded into the cargo box.

This invention provides a freight truck that allows workers to easily visually check the load weight when loading earth and sand into a shipping box, and that makes it easy to prevent the truck from driving away with the load weight still displayed after loading.

FIG. 1 is a side view of a truck with a cargo box in a seated position. FIG. FIG. FIG. 1 is a side view of a truck with a cargo box in a tilted position. FIG. 2 is a circuit diagram of the main parts of a hydraulic circuit. FIG. FIG. 1 is a side view of a truck with the cargo box in the separated position. FIG. 1 is a block diagram of a system for displaying a load weight. FIG. 2 is a block diagram of a weight display prohibition device and various detection devices.

Embodiments of the present invention will now be described with reference to the drawings. Figure 1 is a side view of a truck 1 according to this embodiment. Figure 2 is a plan view of the truck 1, and Figure 3 is a rear view of the truck 1.

As shown in FIG. 1, 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 located behind the cab 3 and on the chassis frame 2, and a cargo box 30 supported by the subframe 7. 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 examples of wheels that rotate upon receiving power from the drive source. The chassis frame 2, cab 3, subframe 7, engine 9, and PTO 10 form vehicle body 1A. A driver's seat (not shown) is located inside the cab 3. Unless otherwise specified, in the following description, front, rear, left, right, top, and bottom refer to the front, rear, left, right, top, and bottom as seen from the driver sitting in the driver's seat.

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.

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 includes 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 it 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 using power from the engine 9.

As shown in Figures 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, right wall 34, and tailgate 35. As shown in Figure 1, for example, the front wall 32 extends upward to a position higher than the top end of the cab 3.

The tailgate 35 is configured to be rotatable around a hinge shaft 37 extending in the left-right direction. The tailgate 35 can rotate 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 Figure 4, the state when the tailgate 35 is in the closed position is represented by a solid line, and the state when it is 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 removed from the cargo box 30, the cargo box 30 tilts and the tailgate 35 rotates to the open position. This opens the cargo box 30 rearward, allowing earth or sand to be removed smoothly from the cargo box 30.

Figure 6 is a rear view of the cargo box 30. However, the front wall 32 is not shown in Figure 6. As shown in Figure 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 engaged. 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 its engagement with 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.

As shown in FIG. 1, the vehicle body 1A has a seating portion 11 that supports the bottom of the cargo box 30. The seating portion 11 is provided on the 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 seating portion 11. More 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 seating portion 11. On the other hand, as shown in FIG. 7, when the cargo box 30 is tilted by rotating it around the hinge shaft 8, the bottom of the cargo box 30 moves away from the seating portion 11. Hereinafter, the position of the cargo box 30 when its bottom is supported by the seating portion 11 will be referred to as the seating position, and the position of the cargo box 30 when its bottom is separated from the seating portion 11 will be referred to as the separated position.

The truck 1 is equipped with a weighing scale 40 (see Figure 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 in 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 calculated. 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. 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 example above, 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.

In this embodiment, the 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 the hydraulic cylinder 25. However, there are no limitations on the type or configuration of the weighing scale 40, and any weighing scale that has traditionally been used to measure the load weight of cargo boxes on freight vehicles can be used.

However, if the weighing scale 40 is a load cell type, when the cargo box 30 is supported on the seat 11 (see Figure 1), part of the weight of the cargo box 30 will be applied to the seat 11. As a result, the entire weight of the cargo box 30 will not be applied to the weighing scale 40, and the weight of the cargo box 30 will not be accurately measured by the weighing scale 40. Even if the weighing scale 40 calculates the load weight based on the hydraulic pressure of the hydraulic cylinder 25, when the cargo box 30 is supported on the seat 11, the load will be applied to the seat 11, and the load applied to the hydraulic cylinder 25 will be reduced (or eliminated). As a result, the weight of the cargo box 30 will not be accurately measured. Therefore, if the 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 the hydraulic cylinder 25, the load weight is measured with the cargo box 30 rotated to the separated position, as shown in Figure 7. In other words, the load weight is measured with the cargo box 30 separated from the seat 11.

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

The dimensions of the display 50 are not particularly limited, but it is preferable that it be large enough to be visible to the 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.

However, 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 or sand, it will attract the attention of the driver of the following vehicle. In particular, if the measured weight of the weighing scale 40 fluctuates slightly due to vibrations while traveling, the load weight displayed on the display 50 will change frequently, which will particularly attract the attention of the driver of the following vehicle. Even if the display 50 is configured to be able to turn on and off, as well as when it is configured to display constantly, operators and drivers may forget to turn off the display 50, which may result in the truck 1 traveling 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. It is also configured to prohibit the display 50 from displaying the load weight while traveling after a loading operation.

As shown in Figure 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 the display 50 is displaying the load weight, and is located inside the cab 3 (see Figure 1). The notification device 55 may be a device that notifies using light, images, or sound, and may be, for example, an LED lamp, a liquid crystal display device, a speaker, etc. As an example of a case in which the communication device 55 is configured as a liquid crystal display device, it may be one that displays the load weight and other information on the screen when the display 50 is turned on.

In addition, in the freight truck 1 according to this embodiment, the display 50 is communicatively connected to the weighing scale 40 via the weight display prohibition device 60. The weight display prohibition device 60 is configured, for example, by a computer. The weight display prohibition device 60 allows the display 50 to display the load weight at least during the loading of soil, sand, etc. into the cargo box 30. The weight display prohibition device 60 receives a signal from the weighing scale 40 and information regarding the load weight from the weighing scale 40 at least during the loading of soil, sand, etc. into the cargo box 30. The weight display prohibition device 60 also outputs a signal to the display 50 and passes information regarding the load weight to the display 50 at least during the loading of soil, sand, etc. into the cargo box 30. The worker performing the loading operation can keep track of the load weight by looking at the display 50. Meanwhile, the weight display prohibition 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 prohibition device 60 may be configured to turn off the display 50 at least while the freight vehicle 1 is traveling after loading.

This embodiment prevents the display of the load weight on the display 50 while the freight truck 1 is traveling after loading. This makes it less likely to attract the attention of the driver of a following vehicle when the freight truck 1 is traveling with earth and sand loaded in the cargo box 30. 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 wear out quickly, making it impossible to display the required information when earth and sand are being loaded. However, this embodiment prevents this from happening.

As mentioned above, in this embodiment, the cargo box 30 is held in the separated position when measuring the load weight (see Figure 7). Loading of soil and sand into the cargo box 30 is performed 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 Figure 1). As shown in Figure 9, the freight vehicle 1 according to this embodiment is equipped with a cargo box position detection device 71 that detects when the cargo box 30 is in the seated position.

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 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, 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 hydraulic pressure of the hydraulic cylinder 25 and detect that the cargo box 30 is in the seating position based on the hydraulic pressure of the hydraulic cylinder 25 being lower than a predetermined threshold.

As shown in FIG. 9, the weight display prohibition device 60 according to this embodiment is communicatively connected to a cargo box position detection device 71 and is configured to receive signals from the cargo box position detection device 71. The weight display prohibition device 60 has a display prohibition unit 61 that prohibits the display 50 from displaying the load weight when the cargo box position detection 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 50 is prohibited from displaying the load weight. This prevents the load weight from being displayed on the display 50 while the freight vehicle 1 is traveling.

Freight truck 1 is also equipped with a parking brake 12 (see Figure 9). Loading of soil and sand into cargo box 30 may be performed with 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 parking brake 12 may be ON. When parking brake 12 is ON, freight truck 1 remains stopped. On the other hand, when freight truck 1 is traveling after loading, parking brake 12 is OFF. As shown in Figure 9, freight truck 1 according to this embodiment is equipped with a parking brake detection device 72 that detects whether parking brake 12 is ON or OFF.

The weight display prohibition device 60 is communicatively connected to the parking brake detection device 72 and is configured to receive signals from the parking brake detection device 72. The weight display prohibition device 60 may have a display prohibition unit 62 that prohibits the display 50 from displaying the load weight when the parking brake detection device 72 detects that the parking brake 12 is OFF. In this case, the display 50 is prohibited from displaying the load weight when the parking brake 12 is OFF. This prevents the load weight from being displayed on the display 50 while the freight truck 1 is traveling after loading.

Loading of soil 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, loading of soil and sand into the cargo box 30 is performed when the truck 1 is traveling at zero speed. On the other hand, when the truck 1 is traveling, its traveling speed is greater than zero. The truck 1 is equipped with a speed detection device 73 that measures its traveling speed.

The weight display prohibition device 60 may have a display prohibition unit 63 that prohibits the display 50 from displaying the load weight when the speed detection device 73 detects that the truck 1's traveling speed is not zero. This prevents the load weight from being displayed on the display 50 while the truck 1 is traveling after loading.

As mentioned 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. In other words, 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 said that the PTO 10 is ON, and when the PTO 10 is not extracting the power of the engine 9, it will be said that the PTO 10 is OFF. When the hydraulic pump 22 is driven, the PTO 10 is ON. When the truck 1 is traveling, the power of the engine 9 is transmitted to the front wheels 5 or rear wheels 6, and not to the mounted equipment. When the truck 1 is traveling, the PTO 10 is OFF. The PTO 10 is also OFF when loading earth and sand, etc., 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 Figure 7, or when the truck is fully dumped to unload soil and sand. As shown in Figure 9, the truck 1 is equipped with a power take-off detection device 74 that detects whether the PTO 10 is on or off.

The weight display prohibition device 60 has a display prohibition unit 64 that prohibits the display 50 from displaying the load weight when the power takeoff detection device 74 detects that the PTO 10 is ON. Therefore, when the PTO 10 is ON, the display 50 is prohibited from displaying the load weight. This prevents the display 50 from displaying the load weight unnecessarily.

Incidentally, with the freight truck 1, there is no need to display the load weight on the display 50 not only when driving, but also when unloading soil or sand from the cargo box 30. With the freight truck 1, when loading soil or sand into the cargo box 30, the manual locking mechanism 36 (see Figure 6) of the tailgate 35 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 allowed to rotate. The manual locking mechanism 36 of the tailgate 35 is also turned ON when the freight truck 1 is driving. On the other hand, when tilting the cargo box 30 to unload soil or sand loaded in the cargo box 30, the manual locking mechanism 36 of the tailgate 35 is turned OFF, allowing the tailgate 35 to rotate. When the manual locking mechanism 36 is OFF, there is no need to display the load weight on the display 50. As shown in Figure 9, the truck 1 is equipped with a manual lock detection device 75 that detects whether the manual lock mechanism 36 is on or off.

The weight display prohibition device 60 has a display prohibition unit 65 that prohibits the display 50 from displaying the load weight when the manual lock detection device 75 detects that the manual lock mechanism 36 is OFF. Therefore, when the manual lock mechanism 36 is OFF, the display 50 is prohibited from displaying the load weight. This prevents the display 50 from displaying the load weight when earth, sand, etc. is being discharged from the shipping box 30. Unnecessary displays by the display 50 can be prevented.

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 mounted facing rearward on the upper part of the front wall 32 of the cargo box 30. Therefore, the operator can easily view the display 50 when using a hydraulic excavator, wheel loader, or the like to load earth and sand into the cargo box 30. This allows the operator to easily and continuously check the load weight during loading operations. 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. Upon 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 loading operations. This also prevents the premature wear of the display 50's batteries or light bulbs.

In addition, the display 50 is positioned in a location that is easily noticeable to the driver of a following vehicle, but this embodiment prevents the freight truck 1 from traveling with the display 50 still displaying the load weight after loading. Therefore, the freight truck 1 according to this embodiment is less likely to attract the attention of the driver of a following vehicle when traveling with the cargo box 30 loaded with earth, sand, etc.

The above describes one embodiment of the present invention, but this is merely an example. The present invention can be implemented in a variety of other forms. Below, we will briefly explain other example embodiments.

In the above embodiment, the weight display prohibition device 60 has display prohibition units 61-65, but at least one of the display prohibition unit 64 and the display prohibition unit 65 may be omitted. Furthermore, the weight display prohibition device 60 may have only one, two, or three of the display prohibition units 61-64. The weight display prohibition device 60 may have other display prohibition units instead of the display prohibition units 61-64.

The weight display prohibition device 60 is not limited to being configured to turn off the display 50, as long as it is configured to prohibit the display 50 from displaying the load weight at least while the freight truck 1 is traveling after loading. For example, the weight display prohibition device 60 may be configured to allow the display 50 to display a display that is less likely to attract the attention of the driver of a following vehicle (for example, a constant display with unchanging display content) while the freight truck 1 is traveling after loading.

The freight vehicle 1 may be equipped with a display other than the display 50 installed at the top 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 equipped with another display inside the cab 3 that displays the load weight in addition to the display 50. The other display may or may not display the load weight while the freight vehicle 1 is traveling.

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

1 Freight car 1A Vehicle body 5 Front wheels (wheels)
6 Rear wheel (wheel)
9. Engine (power source)
10 Power take-off device 11 Seat 13 Rotation support 22 Hydraulic pump (mounted equipment)
30 Cargo box 31 Bottom plate 32 Front wall 35 Tailgate 36 Manual locking mechanism 40 Weight scale 50 Display 60 Weight display prohibition device

Claims (4)

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,
a weight display prohibiting device that prohibits the display of the weight of the load by the display device at least while the vehicle is traveling;
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;
the weight display prohibiting device has a first display prohibiting unit that prohibits the display of the weight of the load when the cargo box position detecting device detects that the cargo box is in the seating position,
A hydraulic cylinder is provided to rotate the packing box,
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 based on the oil pressure of the hydraulic cylinder being lower than a threshold value. 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,
a weight display prohibiting device that prohibits the display of the weight of the load by the display device at least while the vehicle is traveling;
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 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;
The weight display prohibition device of the freight vehicle 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. 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,
a weight display prohibiting device that prohibits the display of the weight of the load by the display device at least while the vehicle is traveling;
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,
The weight display prohibition device of a freight truck 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. 4. The freight vehicle according to claim 1, further comprising a notification device that notifies the driver whether or not the indicator is displaying the weight of the load while the vehicle is traveling.