JP7548850B2 - dump truck - Google Patents

Description

The present invention relates to a dump truck.

A dump truck is a truck that can unload cargo by tilting the loading platform (see, for example, Patent Document 1). Dump trucks generally have a loading platform mounted on a chassis frame with the longitudinal direction being the front-to-rear direction, and a dump device that is fixed to the chassis frame and tilts the loading platform. This dump device is used to unload, for example, soil, waste, etc. loaded on the loading platform to the rear of the vehicle.

JP 2017-114413 A

In recent years, illegal dumping of construction waste, business waste, and bulky household waste has become a problem. There has also been an increase in the number of cases of waste washing up on ports and coasts from overseas. As a collection vehicle for this waste, the inventor focused on dump trucks, which excel in both transport and discharge and can be used in a variety of situations.

However, places where waste is illegally dumped are often uneven or sloping ground where dump trucks cannot enter, such as under mountain roads or along rivers. When collecting such waste, it takes a lot of effort to enter the dumping site and carry the waste away. Even if the waste is transported from the dumping site with great difficulty, it is still laborious to load it onto the bed of a dump truck, especially if the waste is large.

The object of the present invention is to provide a dump truck that can reduce the burden of garbage collection work.

In order to achieve the above-mentioned objective, the present invention provides a dump truck comprising a loading platform tiltably mounted on the upper part of a chassis frame whose longitudinal direction is the fore-and-aft direction of the vehicle, a loading platform lifting device having a loading platform that can be raised and lowered between the floor surface of the loading platform and the ground, and a winch attached to the chassis frame and capable of pulling out a cord-like body to the rear side of the vehicle, wherein the chassis frame is composed of left and right main frames whose longitudinal direction is the fore-and-aft direction and a cross member connecting the left and right main frames, and the entire winch is positioned at the rear of the vehicle so that it is lower above ground than the lower end of the cross member .
The present invention also provides a dump truck comprising a loading platform tiltably mounted on the upper part of a chassis frame whose longitudinal direction is the fore-and-aft direction of the vehicle, a loading platform lifting device having a loading platform that can be raised and lowered between the floor of the loading platform and the ground, and a winch mounted on the chassis frame and capable of pulling out a rope-like body to the rear side of the vehicle, the winch being mounted on the underside of the chassis frame via a support member.

This invention can reduce the burden of manual garbage collection and loading work, and can utilize the excellent performance of dump trucks in terms of transportation and discharge for a variety of collection tasks, expanding the scope of applications for dump trucks.

FIG. 1 is a side view showing an overall configuration of a dump truck according to an embodiment of the present invention. FIG. 1 is a rear view showing an overall configuration of a dump truck according to an embodiment of the present invention. FIG. 2 is a diagram showing the dumping posture of the dump truck shown in FIG. 1 . An enlarged view of the winch and its surroundings from the side view of Figure 1. FIG. 5 is a rear view of the part shown in FIG. 4 as seen from the rear. FIG. 2 is a diagram illustrating an example of a garbage collection operation using the dump truck illustrated in FIG. 1 . FIG. 2 is a diagram showing another example of garbage collection work using the dump truck shown in FIG. 1 ;

The following describes an embodiment of the present invention using the drawings.

-dump truck-
Fig. 1 is a side view showing the overall configuration of a dump truck according to an embodiment of the present invention, Fig. 2 is a rear view, and Fig. 3 is a view showing the dumping posture of the dump truck shown in Fig. 1. In the following description, the left and right in Fig. 1 correspond to the front and rear of the dump truck.

The dump truck 1 shown in Figures 1 and 2 includes a vehicle 10, a loading platform 20, a loading platform lifting device 30, and a winch 40.

The vehicle 10 includes a cab 11 and a chassis frame (body frame) 12 connected to the rear of the cab 11. The chassis frame 12 is longitudinal in the front-rear direction and includes left and right main frames (vertical beams) 13 with the same longitudinal direction, and cross members (horizontal beams) 14 connecting the left and right main frames 13 at predetermined positions. The cross members 14 are longitudinal in the left-right direction and are provided at multiple locations spaced apart from each other in the front-rear direction. The rear of the chassis frame 12, that is, the rear of the left and right main frames 13 (near the rear end), is provided with an axle hole 15 (Figure 4) through which a rotation axis 25, which serves as a tilting fulcrum for the loading platform 20, passes. The main frame 13 is mainly made of long steel material such as steel section or steel pipe (Figure 5), and Figure 4 shows an example of a configuration in which the axle hole 15 is drilled directly into the steel material. However, the main frame 13 may also be constructed by joining block- or bracket-shaped parts to a long piece of steel material by welding or the like, and the shaft hole 15 may be provided in such a block- or bracket-shaped part. For example, this may be the case when a bracket-shaped member (not shown) with a shaft hole 15 is welded to an original chassis frame produced by a vehicle manufacturer as an add-on part that constitutes the main frame 13.

The loading platform 20 is mounted on the chassis frame 12 so that it can tilt with its rear part as a fulcrum. A bracket is provided on the loading platform 20 at the rear under the floor, and this bracket is connected to the main frame 13 of the chassis frame 12 via a rotation shaft 25. The dump truck 1 of this embodiment does not have a so-called subframe (for example, the subframe 4 of JP 2019-147534 A), and the loading platform 20 is directly connected to the chassis frame 12 without a subframe. However, the loading platform 20 may be connected to the chassis frame 12 via a subframe. In this embodiment, the loading platform 20 is made up of a floor panel 21, a front wall 22, and left and right side walls 23, and is open at the top and rear.

The loading platform 20 and the chassis frame 12 are connected by a hydraulic cylinder (not shown) that constitutes a known dumping device. One end of this hydraulic cylinder is rotatably connected to the loading platform 20 via a hoist mechanism (not shown), and the other end is rotatably connected to the chassis frame 12. The extension and contraction of the hydraulic cylinder causes the loading platform 20 to tilt relative to the chassis frame 12, with a rotation shaft 25 as a fulcrum, and to stand up in a dump position (Figure 3) that slopes downward toward the rear, or to lie down horizontally (Figure 1). The cylinder is driven by pressurized oil from a hydraulic pump (not shown) mounted on the chassis frame 12.

- Loading platform lifting device -
The load-receiving platform lifting device 30 is configured to include left and right posts 31 , left and right sliders 32 , and a load-receiving platform 33 .

The left and right posts 31 are hollow members with rectangular cross sections that guide the lifting and lowering of the loading platform 33, and are fixed to the rear of the loading platform 20, specifically to the rear end faces of the left and right side walls 23 of the loading platform 20. When the loading platform 20 is in a lying position (Figure 1), the left and right posts 31 extend vertically. Therefore, in this embodiment, the loading platform lifting device 30 tilts together with the loading platform 20.

The position of the upper end of the post 31 is slightly higher than the upper surface of the cab 11, and in this embodiment, the height is aligned with the upper surface of the side wall 23 of the loading platform 20. A fixed sheave 35 (Figure 1), which is a fixed pulley, is rotatably supported on the upper part of the left and right posts 31. The rotation axis of the fixed sheave 35 extends to the left and right. Note that the fixed sheave 35 is an element housed inside the post 31, but in Figure 1, the outer wall of the post 31 is shown in perspective.

The position of the lower end of the post 31 is lower than the lower surface of the floor plate 21 of the loading platform 20 and the lower surface of the chassis frame 12, and in this embodiment is set as low as possible while ensuring the specified departure angle α (Figure 1) of the dump truck 1. The left and right posts 31 are connected by a cross member 34 (Figure 2), which is also a hollow member with a rectangular cross section that extends in the vehicle width direction (left-right direction). The upper surface of the cross member 34 is aligned at the same height as the upper surface (floor surface) of the floor plate 21 of the loading platform 20.

The sliders 32 are inserted into the left and right posts 31 one by one, and can be raised and lowered inside the posts 31 while being guided by the posts 31. For ease of explanation, in Figs. 1 and 3, the sliders 32 are shown in perspective through the posts 31. One end of a wire (not shown) that passes through the inside of the post 31 and is hung on a fixed sheave 35 is fixed to the left and right sliders 32. The other end of the wire is fixed to the inner wall of the post 31 or the cross member 34 via a movable sheave (not shown), which is a movable pulley. The movable sheave is rotatably attached to the tip of the rod of a hydraulic cylinder (not shown). The hydraulic cylinder is housed inside the post 31 or the cross member 34 in a position along the post 31 or the cross member 34. The extension and contraction of this hydraulic cylinder causes the movable sheave to move inside the post 31 or cross member 34, and the slider 32 is pulled up by the wire hung on the movable sheave, or the wire is unwound and the slider 32 descends under its own weight.

The cargo receiving platform 33 is connected to the left and right sliders 32 and can be raised and lowered along the post 31 together with the sliders 32. In a horizontal position with the cargo receiving surface S facing upward, the cargo receiving platform 33 rises and falls between a height where the cargo receiving surface S is connected to the floor surface of the cargo platform 20 and a height where the cargo receiving surface S is on the ground. Although not shown in detail, a slit extending vertically is provided on the rear wall surface (surface facing rearward) of the left and right posts 31, and a part of the slider 32 housed inside the post 31 protrudes from the post 31 through the slit. The cargo receiving platform 33 is connected to the part of the left and right sliders 32 that protrudes rearward from the post 31.

The load-receiving platform 33 is connected to the slider 32 via a rotation shaft extending left and right, and is configured to be freely rotatable within a 90-degree range between a horizontal position in which the load-receiving surface S faces upward and an upright position in which the load-receiving surface S faces forward, as indicated by the double-headed arrow in FIG. 1. The load-receiving platform lifting device 30 is equipped with a stopper that limits the lower limit of the rotation range of the load-receiving platform 33, and this stopper keeps the load-receiving platform 33 in a horizontal position even during lifting. In addition, the side of the post 31 is equipped with a holding member that engages with the load-receiving platform 33 in the upright position, and this holding member prevents the load-receiving platform 33 in the upright position from accidentally falling over.

As described above, the loading platform 33 can stand up along the post 31, and when it is upright, it also serves as the rear wall of the loading platform 20. In other words, when the loading platform 33 is in an upright position, the rear opening of the loading platform 20 is blocked by the loading platform 33, and when the loading platform 33 is in a horizontal position, the rear opening of the loading platform 20 is open.

The loading platform lifting device 30 is also equipped with a rear bumper 36 of the dump truck 1. The rear bumper 36 is supported by connecting both ends to the lower parts of the opposing surfaces of the left and right posts 31, and is positioned so that its upper surface is lower than the lower ends of the cross member 34, the chassis frame 12, and the winch 40. Since the rear bumper 36 is equipped to the loading platform lifting device 30, it tilts together with the loading platform lifting device 30 when the loading platform 20 tilts, and rotates in an arc trajectory T (Figure 3) around the rotation axis 25 as shown by the dashed line in Figure 3.

- Winch -
4 is an enlarged view of the winch 40 and its surroundings extracted from the side view of FIG. 1, and FIG. 5 is a rear view thereof.

The winch 40 is composed of a winch drum 42 around which a winch rope 41 (Figure 6) is wound, and a motor 43 that drives the winch drum 42. A hook (not shown) is connected to the end of the winch rope 41. When the winch rope 41 is reeled out (pulled out) to the rear of the vehicle and an appropriate hook is attached to the object and the motor 43 is driven, the winch rope 41 is wound around the winch drum 42 and the object is pulled towards the dump truck 1.

The winch 40 is fixed via a support member attached to the underside of the chassis frame 12 so that its ground clearance is lower than that of the chassis frame 12. Specifically, left and right brackets 44 extending downward from the main frame 13 are attached near the rear end of the main frame 13 of the chassis frame 12. These left and right brackets 44 are located rearward of the rearmost cross member 14 and support supports 45 extending left and right at a lower position than the cross member 14. The winch 40 is mounted and fixed on these supports 45, and is located lower than the chassis frame 12 (cross member 14) that supports the winch 40 in its entirety. By making the ground clearance of the winch 40 lower than that of the chassis frame 12 in this way, the winch 40 can be installed in a narrow area rearward of the rearmost cross member 14 between the left and right main frames 13 of the chassis frame 12.

In this embodiment, the bracket 44 is a first bracket 44a that is connected to the bottom surface of the main frame 13 by bolt B1 or the like and hangs down, and a second bracket 44b that is connected to the support 45 by bolt B2 or the like, and is connected by bolt B3 or the like, as shown in FIG. 5. For example, when the vehicle 10 is manufactured by a vehicle manufacturer, the fastening hole of the main frame 13 into which the bolt B1 is inserted can be a fastening hole that is exposed when the original rear bumper (not shown) is removed from the main frame 13. In this embodiment, the rearmost cross member 14 is located forwardly from the rear end of the main frame 13 with a gap therebetween, but it may be located at the rear end of the main frame 13. In this case, the left and right brackets 44 and the rearmost cross member 14 are in a position where they overlap or are close to each other in the fore-and-aft direction.

For reasons described later, it is desirable for the winch 40 to be located as far back as possible, and in this embodiment, it is located further back than the rearmost cross member 14 of the multiple cross members 14 that are spaced apart in the fore-and-aft direction as described above. However, it is not desirable to locate the winch 40 behind the rear bumper 36 of the dump truck 1. Therefore, in this embodiment, the winch 40 is located inside the arcuate path T of the rear bumper 36, which rotates in conjunction with the tilting of the loading platform, and this brings the winch 40 closer to the rear bumper 36 in the fore-and-aft direction.

As shown in Figures 2 and 4, the winch 40 is located at the center of the support 45 in the longitudinal direction and at the center of the vehicle width (on the center line extending from the front to the rear of the dump truck 1). However, for example, the center of gravity of the winch 40 does not need to be exactly at the center of the vehicle width, and it is sufficient if the winch drum 42 overlaps with the center of the vehicle width when viewed from the rear.

-Work example-
6 is a diagram showing an example of a garbage collection operation using a dump truck 1. In this figure, an example is described in which garbage G dumped on an uneven ground C, which is located down a slope B from a road surface A on which the dump truck 1 can travel, such as a river, is collected.

In the figure, when collecting garbage G, the dump truck 1 is parked on road surface A with the rear of the vehicle facing the garbage G, the loading platform 33 is lowered to road surface A in a horizontal position, and the winch rope 41 is let out to hook the garbage G. If there is no part on the garbage G where a hook can be attached, a wire rope (not shown) is used to sling it.

Once the garbage G has been hooked, the motor 43 is driven to wind the winch rope 41 onto the winch drum 42, and the garbage G is pulled up from the rough ground C onto the road surface A and brought close to the dump truck 1.

Then, the garbage G that has been pulled up to the road surface A is placed on the loading platform 33, the hook is removed, and the platform is lifted up to the height of the floor of the loading platform 20, and the garbage G is loaded from the loading platform 33 onto the loading platform 20.

When the loading of the garbage G onto the loading platform 20 is complete, the loading platform 33, which has been raised to the height of the floor of the loading platform 20, is raised and locked, and the opening at the rear of the loading platform 20 is closed. Then, if necessary, measures are taken to prevent the garbage G from falling from the loading platform 20, and the dump truck 1 is driven to transport the garbage G to the destination, such as a disposal site.

In the operation shown in FIG. 6, for example, when manually loading garbage G onto the cargo receiving platform 33, the garbage G may be pulled up to just before the area where the cargo receiving platform 33 is to be lowered, the hook may be released, the winch rope 41 may be wound onto the winch drum 42, and the cargo receiving platform 33 may then be lowered until it touches the ground.

Figure 7 shows another example of garbage collection work using a dump truck 1. In this figure, an example of pulling garbage G from an uneven ground C with a small difference in elevation from the road surface A is explained. When collecting garbage G in this figure, as in the example of Figure 6, the dump truck 1 is stopped on the road surface A with the rear of the vehicle facing the garbage G, and the winch rope 41 is let out to hook the garbage G. The winch rope 41 is then wound up to pull the garbage G from the uneven ground C close to the dump truck 1, and the garbage G is lifted up using the loading platform 33 and loaded onto the loading platform 20. In the example of Figure 7, if the loading platform 33 is lowered to the road surface A before the winch rope 41 is let out, the garbage G can be placed on the loading platform 33 with the winch 40. The subsequent transportation of the garbage G is the same as in the example of Figure 6.

The example shown in FIG. 7 is particularly suitable for cases where garbage G is placed in a narrow road that the dump truck 1 cannot enter. In this case, while it is difficult to load garbage G onto the loading platform of a conventional dump truck, the dump truck 1 of this embodiment can easily load garbage G onto the loading platform 20 by using the winch 40 and the loading platform lifting device 30.

When the garbage G loaded onto the loading platform 20 as shown in Figures 6 and 7 is to be discharged from the loading platform 20 at the destination, the dump truck 1 is stopped at a specified location, the loading platform 33 is unlocked, and the loading platform 33 is tilted down to open the rear opening of the loading platform 20. At this time, it is desirable to simply tilt the loading platform 33 horizontally without changing its height so that the loading surface S is connected to the floor of the loading platform 20 as shown in Figure 3. The order of the work of positioning the dump truck 1 and opening the rear opening of the loading platform 20 may be reversed. After that, the loading platform 20 is raised diagonally as shown in Figure 3, and the garbage G is discharged from the loading platform 20.

-effect-
(1) According to this embodiment, even if the garbage is dumped on an uneven or sloping ground, such as under a mountain road or in a river, where a collection vehicle cannot enter, it can be pulled close to the dump truck 1 by using the winch 40 as described in FIG. 6 and FIG. 7. Therefore, the burden on the worker to carry the garbage on an uneven or sloping ground can be greatly reduced. In addition, since the garbage can be lifted onto the loading platform 20 using the loading platform 33, even relatively large garbage can be easily loaded onto the loading platform 20. In this way, the labor required for loading the garbage onto the loading platform 20 of the dump truck 1 is also small. Of course, the work of discharging the garbage from the loading platform 20 at the destination such as a garbage disposal site can also be easily performed by the dump function. Therefore, according to the dump truck 1 of this embodiment, the burden of garbage collection work can be reduced.

In addition, after the garbage G is loaded onto the loading platform 20, the inherent transport and discharge functions of the dump truck 1 are utilized to transport the garbage G to the destination and to discharge the garbage G. Therefore, according to this embodiment, not only can the burden of manual garbage collection and loading work be reduced, but the excellent performance of the dump truck in terms of transport and discharge can be utilized in various collection operations, expanding the scope of use of the dump truck.

Also, as mentioned in the examples of Figures 6 and 7, by lowering the loading platform 33 in advance, the winch rope 41 can then be let out to pull in the garbage, allowing the winch 40 to place the garbage directly on the loading platform 33. In such a case, the labor required to transfer the garbage pulled in by the winch 40 to the loading platform 33 can be eliminated, further reducing the burden of garbage collection work. The winding force of the winch drum 42 can be used to load the garbage G onto the loading platform 33 without manual labor, which is preferable in terms of labor savings.

Container transport vehicles with mechanisms for attaching and detaching containers (e.g., JP 2020-132294 A) are also effective for collecting waste, but there are often no suitable ground or spaces at illegal waste dumping sites to unload the containers.

In contrast, the dump truck 1 of this embodiment does not require, for example, lowering the loading platform 20, and all that is required is a parking space and an operating space for the loading platform 33. In addition to reducing the labor required to carry garbage and easing external restrictions on carrying garbage, the dump truck 1 is more advantageous than a container transport vehicle in that it does not require a large space for garbage collection.

Trucks equipped with cranes can also be used, especially when collecting large pieces of garbage. However, in order to hoist large pieces of garbage, it is necessary to lift the garbage from the ground surface in a stable hoisting position, and careful preparation work such as deploying outriggers is required. Also, cranes are generally mounted between the driver's cab and the loading platform, and the loading capacity of the loading platform is reduced by the space required to mount the crane, which can reduce the amount of garbage that can be transported at one time.

In contrast, the dump truck 1 of this embodiment does not require outriggers because it only drags the garbage with the winch 40 and does not hoist it from the ground surface, and preparation work for lifting the garbage G is easier than when using a crane. In addition, there is no need to install additional equipment such as a crane on the chassis frame 12 to limit the capacity of the loading platform 20, and there is no need to reduce the capacity of the loading platform 20 compared to dump trucks of a similar size. In these respects, the dump truck 1 of this embodiment is advantageous even compared to trucks equipped with cranes.

In order to avoid the capacity limit of the loading platform, it is also possible to use a regular dump truck together with a crane truck and use the crane truck to load the waste onto the dump truck. However, this requires careful rigging work and requires parking space for multiple vehicles, making the work itself difficult at sites with limited space.

In this regard, the dump truck 1 according to this embodiment can independently haul in the garbage and load it onto the loading platform 20, as described with reference to Figures 6 and 7, so no other vehicle is required.

(2) In the dump truck 1 of this embodiment, the winch 40 is positioned at the rear of the chassis frame 12 at a position lower above the ground than the chassis frame 12.

First, because the winch 40 is located lower than the chassis frame 12, the angle of the winch rope 41 is closer to horizontal when pulling in the garbage G as shown in FIG. 7, compared to when the winch 40 is mounted on top of the chassis frame 12. This reduces the vertical component of the pulling force of the winch 40 and increases the horizontal component that contributes to pulling the garbage G, allowing the garbage G to be pulled efficiently by the pulling force of the winch 40. In addition, because the winch 40 is located lower than the chassis frame 12, interference between the equipment (tail lamps, etc.) installed at the rear of the vehicle and the reeled out winch rope 41 can be avoided.

In addition, when pulling up trash G from a slope as shown in Figure 6, the further forward the winch 40 is moved, the greater the likelihood that the straight line connecting the winch 40 and the trash G will interfere with the corner of the ground surface that is the boundary between road surface A and slope B (dash-dotted line 41' in Figure 6). The greater the interference between the straight line connecting the winch 40 and the trash G and the boundary between road surface A and slope B, the more strongly the winch rope 41 rubs against the ground surface when pulling up the trash G.

Therefore, in the dump truck 1 according to this embodiment, the winch 40 is positioned at the rear of the vehicle 10. This makes it possible to reduce the amount of interference or interference between the straight line connecting the winch 40 and the garbage G and the boundary between the road surface A and the slope B, making it more efficient to work on pulling up the garbage G from a slope. This effect can be obtained not only when pulling the garbage G on flat ground as shown in FIG. 7, but also when pulling the garbage G on a slope as shown in FIG. 6.

In addition, by placing the winch 40 at the rear of the vehicle 10, the front-to-rear distance between the rear bumper 36 and the winch 40 is shortened. This ensures a sufficient vertical distance between the winch rope 41 and the rear bumper 36 when towing garbage G with the winch 40, and reduces interference between the winch rope 41 and the rear bumper 36. This allows the garbage G to be towed stably.

The loading platform lifting device 30 is also located at the rear, so by winding up the winch rope 41, the garbage G can be naturally drawn closer to the loading platform 33. This reduces the distance that the garbage G must travel when transferring it to the loading platform 33, which is also efficient in terms of work.

(3) Generally, the rear bumper of a dump truck is supported by stays that extend rearward from the chassis frame. However, particularly in small or medium-sized vehicles, when a winch is installed at the rear of the chassis frame, it is difficult to attach the rear bumper stays due to space constraints. If the stays are attached to the chassis frame in this severely restricted space, not only will the shape of the stays become more complex and longer to avoid the restrictions, but the weight of the stays may also increase in order to ensure the required strength.

In contrast, in this embodiment, a configuration is adopted in which the rear bumper 36 is supported by the left and right posts 31 of the load-receiving platform lifting device 30. In this embodiment, in addition to achieving the above-mentioned effects by placing the winch 40 at a low position, the rear bumper 36 can be comfortably placed at a position even lower than the winch 40 by supporting it with the posts 31 that extend downward. This makes it less likely for interference to occur between the winch rope 41 and the rear bumper 36, and reduces the number of situations in which the operation of the winch 40 is restricted by the rear bumper. In addition, by connecting the rear bumper 36 to the posts 31, the above-mentioned complicated and elongated stay structure for supporting the bumper can be avoided, and an increase in weight can also be avoided.

When manufacturing the dump truck 1, the vehicle 10 manufactured by the vehicle manufacturer is brought into the factory of the body manufacturer, where the loading platform 20 and other components are mounted, and the loading platform 20, the loading platform lifting device 30, the winch 40, and other components are mounted on the vehicle 10 in the factory. Therefore, the vehicle body 10 brought into the body manufacturer's factory often has the original rear bumper attached by the vehicle manufacturer fixed to the rear of the chassis frame 12 via a stay using fastening means (bolts and nuts). In this embodiment, the fastening means is removed, and the exposed fastening holes can be used to install the winch 40. In other words, the fastening holes used to attach the original rear bumper can be used to fasten the bracket 44 (see FIG. 5). This makes it possible to suppress a decrease in the manufacturing efficiency and strength of the dump truck 1.

Furthermore, by lowering the position of the rear bumper 36, the trajectory of the rear bumper 36, which rotates together with the loading platform 20, can pass under the winch 40. By lowering the position of the rear bumper 36, interference between the rotating rear bumper 36 and the winch 40 can be avoided. In other words, by positioning the winch 40 inside the arc trajectory T of the rear bumper 36, a configuration is established in which the winch 40 is close in the fore-and-aft direction to the rear bumper 36, which is located at the rear end of the dump truck 1. In this way, a layout in which the winch 40 is comfortably positioned near the rear end of the dump truck 1 can be realized, and the above-mentioned effect (2) can be rationally obtained.

(4) The upright loading platform 33 also serves as a door (rear wall of the loading platform 20) that closes the opening at the rear of the loading platform 20. When the loading platform 33 is tilted backwards, it connects to the floor of the loading platform 20, so when the loading platform 20 is tilted backwards as shown in FIG. 3, the tip of the loading platform 33 lowers to near the ground. In other words, the loading platform 33 connects to the floor of the loading platform 20 and acts as a chute that extends to near the ground, and can guide the waste discharged from the loading platform 20 to the desired discharge location.

(5) Because the winch 40 is located in the center of the vehicle width, it is easy to tow the garbage G to a position closer to the center of the dump truck 1 in the vehicle width direction. Therefore, it is easy to place the garbage G in the center of the loading platform 33 whether the garbage G is loaded onto the loading platform 33 by the winch 40 or by hand.

Therefore, the load is not biased to either the left or right side of the dump truck 1 during the process of lifting up the loading platform 33, and the garbage G can be loaded smoothly. This is particularly preferable when the dump truck 1 is stopped on uneven ground, etc., and the weight balance is well-balanced, improving stability. In addition, since the winch 40 is provided in the center of the vehicle width, even if the payout direction of the winch rope 41 swings left and right depending on the conditions under which the dump truck 1 can be stopped or the surrounding conditions of the garbage G, the garbage G can be pulled to the center of the vehicle width after towing, which is preferable.

(6) The chassis frame 12 is provided with an axle hole 15 through which the rotation shaft 25 passes, which serves as the tilting fulcrum for the loading platform 20. In other words, the loading platform 20 is connected to the chassis frame 12 via the rotation shaft 25, and the dump truck 1 of this embodiment does not have a so-called subframe. In this way, since there is no subframe, the position of the floor surface of the loading platform 20 is lowered, and the height dimension of the loading platform 20 can be increased, thereby expanding the loading platform volume. This makes it possible to collect and transport more garbage.

The center of gravity of the dump truck 1 is also lowered, improving stability during driving. However, compared to a configuration in which a subframe is present, the configuration of this embodiment limits the space required to install the winch 40. However, as described above, the configuration allows for a low ground clearance, and furthermore, the position of the top of the winch 40 is lower than the position of the top of the chassis frame 12, so that the winch 40 can be installed without difficulty, despite the subframe-less structure, which provides excellent driving stability, etc.

--Modifications--
There are various dump mechanisms for dump trucks other than the mechanism described in this embodiment. One example is a so-called three-way dump, in which the tilting direction can be switched between three directions. A similar effect can be obtained by mounting the winch 40 and the loading platform lifting device 30, as in the dump truck 1 of this embodiment, on a dump truck equipped with a three-way dump function.

There are also various types of loading platform lifting devices. For example, the configuration in which the slider 32 is driven using a sheave and a wire has been exemplified, but it is also possible to use a chain instead of the wire and a sprocket instead of the sheave. In addition, loading platform lifting devices that store the loading platform inside the cargo box (for example, JP 2010-155600 A and JP 2005-289150 A) can also be applied. If there is enough space, it is also possible to apply a rotating and retractable loading platform lifting device (JP 2020-50131 A) that slides the loading platform and retracts it into the bottom of the vehicle frame for storage. It is also possible to apply a rotating and retractable loading platform lifting device (JP 2010-52569 A) that rotates the loading platform and stores it in the bottom of the vehicle frame. Furthermore, even in the case of a loading platform lifting device that raises and stores the loading platform at the rear of the loading platform, the loading platform does not rise and fall along a post, but rather rises and falls using a rotating arm (for example, JP 2008-189189 A and JP 2004-224082 A). It is also conceivable to apply these loading platform lifting devices.

The design of the winch 40 can also be modified as needed as long as it can achieve the same effect. For example, the wire rope 41 can be modified to a different type of cord, or the members that secure the winch 40 or their configuration can be changed.

In addition, while the example shows a configuration in which the winch 40 is provided at the rear of the chassis frame 12, if the winch 40 can be placed at the rear of the vehicle 10 (near the rear end), the member supporting the bracket 44 that supports the winch 40 does not have to be the chassis frame 12. For example, if the above-mentioned subframe is provided, a configuration in which the bracket 44 is fixed to the rear of the subframe is also possible. In some cases, a structure in which the bracket 44 is fixed to the loading platform 20, post 31, etc. is also possible.

1...Dump truck, 10...Vehicle, 11...Driver's cab, 12...Chassis frame, 15...Axle hole, 20...Loading platform, 21...Floor plate (floor surface of loading platform), 23...Side wall, 25...Rotation axis (fulcrum), 31...Post, 33...Loading platform, 36...Rear bumper, 40...Winch, A...Road surface (ground), T...Circular track (track of rear bumper)

Claims (5)

A loading platform tiltably mounted on an upper portion of a chassis frame having a longitudinal direction in the front-rear direction of the vehicle;
a loading platform lifting device including a loading platform that can be raised and lowered between the floor surface of the loading platform and the ground;
a winch provided on the chassis frame and capable of pulling out a rope-like body toward the rear side of the vehicle,
The chassis frame includes left and right main frames having a longitudinal direction in the front-rear direction and a cross member connecting the left and right main frames,
A dump truck in which the entire winch is disposed at the rear of the vehicle so as to be lower above the ground than the lower end of the cross member. In the dump truck of claim 1 ,
The loading platform lifting device is
Left and right posts provided at the rear of the loading platform to guide the lifting and lowering operation of the loading platform;
a rear bumper, both ends of which are supported by lower portions of the left and right posts so as to be positioned lower than the winch,
The winch is disposed close to the rear bumper in the fore-and-aft direction so as to be located inside the path of the rear bumper which rotates in association with the tilting of the loading platform of the dump truck. In the dump truck of claim 2 ,
The loading platform has left and right side walls and is open at the rear,
The loading platform of the dump truck is configured to be able to stand up and also serves as the rear wall of the loading platform when in the standing state. A loading platform tiltably mounted on an upper portion of a chassis frame having a longitudinal direction in the front-rear direction of the vehicle;
a loading platform lifting device including a loading platform that can be raised and lowered between the floor surface of the loading platform and the ground;
a winch provided on the chassis frame and capable of pulling out a rope-like body toward the rear side of the vehicle,
A dump truck, wherein the winch is provided on the underside of the chassis frame via a support member. In the dump truck according to any one of claims 1 to 4 ,
A dump truck in which the chassis frame is provided with an axle hole through which a rotating axle that serves as a tilting fulcrum for the loading platform passes.

Images