JP2022144375A - dump truck - Google Patents

Abstract

To provide a dump truck which enables reduction of a burden of garbage collection work.SOLUTION: A dump truck 1 is provided including: a vehicle 10 which has a driving cab 11 and a chassis frame 12; a loading platform 20 which is mounted on an upper part of the chassis frame so as to be tilted using a rotary shaft 25 disposed at a rear part as a fulcrum; a loading stand 33 which can move up and down between a floor surface of the loading platform 20 and a ground surface; and a winch 40 which is provided at the chassis frame 12. The winch 40 is supported by a rear part of the chassis frame 12 so as to be located lower than the chassis frame 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to dump trucks.

A dump truck is a truck whose loading platform can be tilted to discharge a cargo (for example, Patent Document 1). Generally, a dump truck includes a loading platform mounted on a chassis frame whose longitudinal direction is the front-rear direction, and a dumping device that is fixed to the chassis frame and tilts the loading platform. Discharge the earth, sand, waste, etc. loaded on the carrier.

JP 2017-114413 A

In recent years, illegal dumping of garbage such as construction waste, business waste, and oversized household waste has become a problem. In addition, there are an increasing number of cases where garbage from foreign countries or the like drifts ashore in harbors, coasts, and the like. As a collection vehicle for collecting such garbage, the present inventor focused on dump trucks that are excellent in both transportation and discharge functions and are utilized in various situations.

However, there are many places where garbage is illegally dumped, such as under mountain roads and rivers, where dump trucks cannot enter. When collecting such garbage, a lot of labor is required to enter the speculation site and carry the garbage. Even if you have to work hard to remove the garbage from the dumping site, it takes a lot of effort to load it into the dump truck bed, especially if it is a large piece of garbage.

SUMMARY OF THE INVENTION An 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 object, the present invention provides a loading platform which is tiltably mounted on the upper portion of a chassis frame whose longitudinal direction is the longitudinal direction of a vehicle, and a loading platform which can move up and down between the floor surface of the loading platform and the ground. To provide a dump truck equipped with a load-receiving table lifting device having a base, and a winch provided on the chassis frame and capable of pulling out a cord-like body to the rear side of the vehicle.

According to the present invention, it is possible to reduce the burden of manual garbage collection and loading work, and to utilize the excellent performance of the dump truck in terms of transportation and discharge for various collection work, thereby expanding the field of activity of the dump truck. can.

1 is a side view showing the overall configuration of a dump truck according to one embodiment of the present invention; 1 is a rear view showing the overall configuration of a dump truck according to one embodiment of the present invention; Diagram showing the dumping posture of the dump truck shown in FIG. Enlarged view showing the winch and its surroundings extracted from the side view of Fig. 1 FIG. 5 is a rear view of the portion shown in FIG. 4 viewed from the rear; A diagram showing an example of garbage collection work using the dump truck shown in FIG. A diagram showing another example of garbage collection work using the dump truck shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.

-dump truck-
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 diagram showing the dumping posture of the dump truck shown in FIG. In the following description, left and right in FIG. 1 are the front and rear of the dump truck.

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

A vehicle 10 includes a driver's cab 11 and a chassis frame (body frame) 12 connected to the rear of the driver's cab 11 . The chassis frame 12 has a front-rear direction as its longitudinal direction, and includes left and right main frames (vertical joists) 13 whose longitudinal direction is the same direction, and cross members (horizontal joists) 14 that connect the left and right main frames 13 at predetermined positions. is composed of The cross members 14 are provided at a plurality of locations with the left-right direction as the longitudinal direction and spaced in the front-rear direction. A rear portion of the chassis frame 12, that is, a rear portion (near the rear end portion) of the left and right main frames 13, is provided with a shaft hole 15 (FIG. 4) through which a rotating shaft 25 serving as a tilting fulcrum of the loading platform 20 is passed. The main frame 13 is mainly composed of a long steel material such as shaped steel or a steel pipe (FIG. 5), and FIG. However, the main frame 13 may be configured by joining block-shaped or bracket-shaped parts to a long steel material by welding or the like, and the shaft hole 15 may be provided in such a block-shaped or bracket-shaped part. . For example, there is a case where a bracket-shaped member (not shown) provided with a shaft hole 15 is welded to an original chassis frame manufactured by a vehicle manufacturer as a retrofitted part constituting the main frame 13 .

The loading platform 20 is mounted on the chassis frame 12 so as to be tiltable with its rear portion as a fulcrum. A bracket is provided in the underfloor rear portion of the cargo bed 20 , and this bracket is connected to the main frame 13 of the chassis frame 12 via a rotating shaft 25 . The dump truck 1 of the present embodiment does not have a so-called subframe (for example, the subframe 4 of Japanese Patent Application Laid-Open No. 2019-147534), and the loading platform 20 is directly connected to the chassis frame 12 without a subframe. However, a configuration in which the loading platform 20 is connected to the chassis frame 12 via a subframe may be employed. In this embodiment, the loading platform 20 is composed of a floor plate 21, a front wall 22, and left and right side walls 23, and is open upward and rearward.

Further, the loading platform 20 and the chassis frame 12 are connected by a hydraulic cylinder (not shown) that constitutes a known dump device. One end of the 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 . Due to the expansion and contraction of the hydraulic cylinder, the loading platform 20 is tilted with respect to the chassis frame 12 about the rotating shaft 25 as a fulcrum. Figure 1). The cylinder is driven by pressure oil from a hydraulic pump (not shown) mounted on the chassis frame 12 .

－Loading tray lifting device－
The load receiving table lifting device 30 includes left and right posts 31 , left and right sliders 32 , and a load receiving table 33 .

The left and right posts 31 are hollow members having a square cross-section that guide the lifting movement of the load receiving platform 33. The left and right posts 31 are fixed to the rear part of the loading platform 20, specifically to the rear end surfaces of the left and right side walls 23 of the loading platform 20, respectively. there is The left and right posts 31 extend vertically when the loading platform 20 is laid down (FIG. 1). Therefore, in the case of this embodiment, the load receiving 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 operator's cab 11, and in this embodiment, the height is aligned with the upper surface of the side wall 23 of the loading platform 20. As shown in FIG. A fixed sheave 35 (FIG. 1), which is a fixed pulley, is rotatably supported above the left and right posts 31 . The rotating shaft of the fixed sheave 35 extends left and right. Although the fixed sheave 35 is an element housed inside the post 31, the outer wall of the post 31 is seen through in FIG.

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 the present embodiment, the predetermined departure angle α (FIG. 1) of the dump truck 1 can be secured. is set low. The left and right posts 31 are connected by a cross member 34 (FIG. 2), which is also a hollow member having a rectangular cross section and extending in the vehicle width direction (left-right direction). The upper surface of the cross member 34 is level with the upper surface (floor surface) of the floor plate 21 of the loading platform 20 .

The sliders 32 are inserted inside the left and right posts 31 one by one, and can move up and down inside the posts 31 while being guided by the posts 31 . For convenience of explanation, the slider 32 is shown through the post 31 in FIGS. One end of a wire (not shown) that passes through the inside of the post 31 and is hooked to the 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 cross member 34 via a moving sheave (not shown) that is a movable pulley. The moving 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 posture along the post 31 or the cross member 34 . The expansion and contraction of the hydraulic cylinder moves the moving sheave inside the post 31 or the cross member 34, and the wire hooked on the moving sheave raises the slider 32, or the wire is let out to lower the slider 32 by its own weight. or

The load receiving table 33 is connected to the left and right sliders 32 and can move up and down along the posts 31 together with the sliders 32 . In a horizontal posture with the load receiving surface S facing upward, the load receiving base 33 moves up and down between a height at which the load receiving surface S is connected to the floor surface of the load base 20 and a height at which the load receiving surface S is grounded. Although not shown in detail, the rear wall surfaces (surfaces facing the rear) of the left and right posts 31 are provided with vertically extending slits. protrudes from the post 31 via the . The load receiving base 33 is connected to portions of the left and right sliders 32 that protrude rearward from the post 31 .

The load-receiving table 33 is connected to the slider 32 via a rotating shaft extending laterally, and as indicated by the double-headed arrow in FIG. It is configured to be rotatable within a range of 90 degrees between the standing posture facing forward. The load receiving platform lifting device 30 is provided with a stopper that limits the lower limit of the rotation range of the load receiving platform 33, and the horizontal position of the load receiving platform 33 is maintained by this stopper even during the lifting. A side surface of the post 31 is provided with a holding member that engages with the load receiving tray 33 in the upright posture, and the holding member prevents the load receiving tray 33 in the upright posture from falling down unintentionally.

As described above, the load receiving platform 33 can stand up along the post 31, and also serves as the rear wall of the loading platform 20 in the upright state. That is, the rear opening of the loading platform 20 is closed by the loading platform 33 when the loading platform 33 is in the upright position, and the rear opening of the loading platform 20 is opened when the loading platform 33 is in the horizontal position.

In addition, the loading platform lifting device 30 is provided with a rear bumper 36 of the dump truck 1 . Both ends of the rear bumper 36 are connected to and supported by the lower surfaces of the left and right posts 31 facing each other. are placed in Since the rear bumper 36 is provided in the loading platform lifting device 30, it tilts together with the loading platform lifting device 30 when the loading platform 20 tilts. is drawn and rotated.

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

The winch 40 includes a winch drum 42 around which a winch rope 41 ( FIG. 6 ) is wound, and a motor 43 that drives the winch drum 42 . A hook (not shown) is connected to the tip of the winch rope 41 . When the winch rope 41 is drawn out (pulled out) to the rear side of the vehicle, and the object is properly hooked and the motor 43 is driven, the winch rope 41 is wound around the winch drum 42 and the object is drawn to the dump truck 1. - 特許庁

The winch 40 is fixed via a support member assembled under the chassis frame 12 so that the ground clearance is lower than 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 positioned rearward of the rearmost cross member 14 and support a support 45 extending left and right at a position lower than the cross member 14 . The winch 40 is mounted and fixed on this support 45 and positioned lower than the chassis frame 12 (cross member 14 ) that supports the winch 40 . Since the ground clearance of the winch 40 is lower than that of the chassis frame 12 in this manner, the winch 40 can be installed in a narrow area behind the rearmost cross member 14 between the left and right main frames 13 of the chassis frame 12 . Become.

In the present embodiment, as the bracket 44, a first bracket 44a connected to the bottom surface of the main frame 13 with bolts B1 or the like and lowered, and a second bracket 44b connected to the support 45 with bolts B2 or the like are attached to each other. FIG. 5 shows a configuration in which B3 and the like are connected. For example, when the vehicle 10 is manufactured by a vehicle manufacturer, as the fastening hole of the main frame 13 into which the bolt B1 is inserted, the fastening hole exposed when the original rear bumper (not shown) is removed from the main frame 13 can be used. can be done. Further, in the present embodiment, the rearmost cross member 14 is positioned forwardly at a distance from the rear end of the main frame 13 , but it may be arranged at the rear end position of the main frame 13 . In this case, the left and right brackets 44 and the rearmost cross member 14 overlap or approach each other in the longitudinal direction.

Further, for the reasons described later, it is desirable that the winch 40 is positioned rearward as much as possible. 14 is located further back. However, it is not desirable to provide the winch 40 behind the rear bumper 36 of the dump truck 1 . Therefore, in this embodiment, the winch 40 is arranged inside the circular arc track T of the rear bumper 36 that rotates with the tilting of the cargo bed, so that the winch 40 approaches the rear bumper 36 in the longitudinal direction.

Further, as shown in FIGS. 2 and 4, the winch 40 is positioned in the longitudinal center of the support 45 and in the center of the width of the vehicle (on the center line extending forward and backward of the dump truck 1). However, for example, the center of gravity of the winch 40 does not have to be exactly aligned with the center of the width of the vehicle.

-Work example-
FIG. 6 is a diagram showing an example of a garbage collection operation using the dump truck 1. As shown in FIG. In the figure, an example of collecting garbage G dumped on an uneven land C descending a slope B from a road surface A on which the dump truck 1 can travel, such as a river, will be described.

In the figure, when collecting garbage G, the dump truck 1 is stopped with the rear part of the vehicle facing the garbage G on the road surface A, the cargo receiving platform 33 is lowered to the road surface A in a horizontal posture, and the winch rope 41 is let out and hooked to the garbage G. Multiply. If the garbage G does not have a portion to be hung with a hook, it is slinged using a wire rope (not shown).

When the garbage G is hooked, the motor 43 is driven to wind the winch rope 41 around the winch drum 42, and the garbage G is lifted from the uneven ground C to the road surface A and pulled to the vicinity of the dump truck 1. - 特許庁

After that, the garbage G pulled up on the road surface A is put on the load receiving table 33, the hook is removed, and the garbage G is loaded from the load receiving table 33 to the loading board 20 by lifting up to the height of the floor surface of the loading board 20.例文帳に追加

When the loading of the garbage G onto the loading platform 20 is completed, the loading platform 33 raised to the height of the floor surface of the loading platform 20 is raised and locked, and the rear opening of the loading platform 20 is closed. Then, if necessary, the garbage G is treated so as not to fall from the loading platform 20, and the dump truck 1 is driven to transport the garbage G to a destination such as a disposal site.

In the work shown in FIG. 6, for example, when the waste G is manually placed on the load receiving table 33, the waste G is pulled up to the front of the area where the load receiving table 33 is lowered, the hook is removed, and the winch rope 41 is wound around the winch drum 42. After picking up, the load receiving platform 33 may be lowered until it touches the ground.

FIG. 7 is a diagram showing another example of garbage collection work using the dump truck 1. As shown in FIG. In the figure, an example of attracting dust G from an uneven ground C having a small height difference with the road surface A will be described. 6, the dump truck 1 is stopped with the rear part of the vehicle facing the garbage G, and the winch rope 41 is let out to hook the garbage G. As shown in FIG. After that, the winch rope 41 is wound up to draw the refuse G from the uneven ground C to the vicinity of the dump truck 1, and the refuse G is lifted using the load receiving platform 33 and loaded onto the loading platform 20.例文帳に追加In the example of FIG. 7 as well, if the load receiving platform 33 is lowered onto the road surface A before the winch rope 41 is let out, the waste G can be placed on the load receiving platform 33 by the winch 40 . Transportation of the garbage G thereafter is the same as in the example of FIG.

In particular, the example shown in FIG. 7 is suitable when the garbage G is placed on a narrow road where the dump truck 1 cannot enter. In this case, it was difficult for the conventional dump truck to load the garbage G onto the loading platform. can be loaded.

6 and 7, when the garbage G loaded on the loading platform 20 is to be discharged from the loading platform 20 at the destination, the dump truck 1 is stopped at a predetermined place, the loading platform 33 is unlocked, and the loading platform 33 is knocked down. The rear opening of the loading platform 20 is opened. At this time, it is desirable that the load receiving platform 33 is simply laid down horizontally without changing its height so that the load receiving surface S continues to the floor surface of the loading platform 20 as shown in FIG. The work order of positioning the dump truck 1 and opening the rear opening of the loading platform 20 may be reversed. After that, as shown in FIG. 3, the loading platform 20 is raised obliquely to discharge the garbage G from the loading platform 20. - 特許庁

-effect-
(1) According to the present embodiment, even garbage dumped on uneven ground or sloped land where recovery vehicles cannot enter, such as under mountain roads and rivers, can be dumped by dump truck by using the winch 40 as described with reference to FIGS. It can be pulled close to 1. Therefore, it is possible to greatly reduce the burden on workers carrying garbage on uneven ground or slopes. Since the garbage can be lifted onto the loading platform 20 using the loading platform 33, even relatively large-sized garbage can be easily loaded onto the loading platform 20.例文帳に追加In this way, the labor required for the work of loading garbage onto the loading platform 20 of the dump truck 1 is also small. Needless to say, the operation of discharging garbage from the loading platform 20 at a destination such as a garbage disposal site can be easily performed by the dump function. Therefore, according to the dump truck 1 of the present embodiment, it is possible to reduce the burden of garbage collection work.

In addition, the inherent transport and discharge functions of the dump truck 1 are used for transportation to the destination after the garbage G is loaded on the loading platform 20 and discharge of the garbage G. Therefore, according to the present embodiment, not only can the burden of manual garbage collection and loading work be reduced, but also the excellent performance of dump trucks in terms of transportation and discharge can be utilized in various collection operations, making dump trucks useful. can expand the field of

As mentioned in the examples of FIGS. 6 and 7, by lowering the load-receiving table 33 in advance, if the winch rope 41 is then let out to attract the waste, the winch 40 directly pulls the waste onto the load-receiving board 33. be loaded. In such a case, it is possible to save labor for transferring the garbage drawn by the winch 40 to the receiving table 33, and to further reduce the burden of the garbage collection work. The winding force of the winch drum 42 can be used to place the refuse G on the receiving table 33 without manual labor, which is preferable in terms of labor saving.

A container truck with a mechanism for attaching and detaching containers (for example, Japanese Patent Application Laid-Open No. 2020-132294) is also effective for collecting garbage. Often not.

On the other hand, in the dump truck 1 of the present embodiment, for example, it is not necessary to lower the loading platform 20, and it is sufficient if a parking space and an operation space for the loading platform 33 can be secured. In addition to the fact that it is possible to reduce the labor for carrying garbage, that external restrictions on carrying garbage can be relaxed, and that it does not require such a large space for garbage collection, it is advantageous over container trucks.

Moreover, a truck or the like equipped with a crane can also be used when collecting particularly large-sized garbage. However, in order to lift large garbage, it is necessary to lift the garbage from the ground surface in a stable lifting posture, and careful preparation work such as deployment of outriggers is required. In addition, the crane is generally mounted between the driver's cab and the loading platform, and the loading capacity of the loading platform is reduced by the amount of space for mounting the crane, and the amount of garbage that can be transported at one time can also be reduced.

On the other hand, the dump truck 1 of the present embodiment does not require outriggers because the winch 40 only drags the garbage and does not hoist it from the ground surface. . Further, there is no need to additionally install a facility for limiting the capacity of the loading platform 20, such as a crane, on the chassis frame 12, and it is not necessary to reduce the capacity of the loading platform 20 compared to a dump truck of the same vehicle size. In these points, the dump truck 1 according to the present embodiment is advantageous even when compared with a truck equipped with a crane.

In addition, from the viewpoint of avoiding the capacity limit of the loading platform, it is conceivable to use a general dump truck together with a crane truck and load the garbage onto the dump truck with the crane truck. However, in addition to the careful slinging work, it also requires parking space for multiple vehicles, making the work itself difficult at sites with limited space.

In this respect, the dump truck 1 according to the present embodiment does not require any other vehicle because it can pull the garbage and load it onto the loading platform 20 by itself, as described with reference to FIGS. 6 and 7 .

(2) In the dump truck 1 of the present embodiment, the winch 40 is arranged in the rear portion of the chassis frame 12 at a position lower than the ground clearance of the chassis frame 12 .

First, since the winch 40 is positioned lower than the chassis frame 12, compared to the case where the winch 40 is temporarily mounted on the chassis frame 12, the winch rope is more difficult to draw dust G as shown in FIG. The angle of 41 approaches horizontal. As a result, the vertical component of the tractive force of the winch 40 can be suppressed, and the horizontal component that contributes to attracting the dust G can be increased. In addition, since the winch 40 is located at a position lower than the chassis frame 12, it is possible to avoid interference between the furnishings (tail lamp, etc.) provided at the rear part of the vehicle and the let out winch rope 41.例文帳に追加

When the garbage G is pulled up from the sloped ground as shown in FIG. The possibility that the corner portions interfere with each other increases (chain double-dashed line 41' in FIG. 6). The larger the amount of interference between the straight line connecting the winch 40 and the dust G and the boundary portion between the road surface A and the slope B, the stronger the winch rope 41 rubs against the ground surface when attracting the dust G.

Therefore, in the dump truck 1 according to this embodiment, the winch 40 is arranged at the rear portion of the vehicle 10 . As a result, the amount of interference or interference between the straight line connecting the winch 40 and the garbage G and the boundary portion between the road surface A and the slope B can be suppressed, and the work of pulling up the garbage G from the slope is highly rational. This effect can be obtained not only when the garbage G is pulled on the flat ground as shown in FIG. 7 but also when the garbage G is pulled on the sloped ground as shown in FIG.

Further, by arranging the winch 40 at the rear portion of the vehicle 10, the front-to-rear distance between the rear bumper 36 and the winch 40 is shortened. Therefore, a vertical gap can be secured between the winch rope 41 and the rear bumper 36 when the dust G is towed by the winch 40, and interference between the winch rope 41 and the rear bumper 36 can be suppressed. As a result, the pulling operation of the dust G can be stably performed.

Since the load-receiving table lifting device 30 is also arranged at the rear part, if the winch rope 41 is wound up, the refuse G can be naturally drawn near the load-receiving table 33. - 特許庁Therefore, the movement distance of the garbage G when the garbage G is transferred to the receiving table 33 can be suppressed, and it is also rational in terms of work.

(3) In general, the rear bumper of the dump truck is supported by stays extending rearward from the chassis frame. However, when the winch is installed at the rear part of the chassis frame, it is difficult to attach the stay of the rear bumper especially in a small or medium-sized vehicle due to space restrictions. If the stay is attached to the chassis frame in a state where the space is greatly restricted, not only will the shape of the stay become complicated and long in order to avoid the restriction, but also the weight of the stay will be increased in order to secure the required strength. can also increase.

On the other hand, in the present 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. As shown in FIG. In this embodiment, the winch 40 is arranged at a low position, and in addition to the above-mentioned effects, the post 31 extending downward supports the rear bumper 36, so that the rear bumper 36 can be forced to a position lower than the winch 40. can be placed without As a result, interference between the winch rope 41 and the rear bumper 36 is less likely to occur, and situations in which the operation of the winch 40 is restricted by the rear bumper are reduced. In addition, by connecting the rear bumper 36 to the post 31, the complication and lengthening of the stay structure as described above can be avoided, and an increase in weight can be avoided with respect to the stay for supporting the bumper.

Regarding the manufacture of the dump truck 1, the vehicle 10 manufactured by the vehicle manufacturer is brought to the factory of the vehicle maker that mounts (mounts) the bed 20 and the like. 30, winch 40, etc. are mounted. Therefore, the vehicle body 10 brought into the body maker's factory has the original rear bumper installed by the vehicle maker fixed to the rear part of the chassis frame 12 via stays by fastening means (bolts and nuts). many. Therefore, in this embodiment, the fastening means can be removed and the exposed fastening hole can be used for installing the winch 40 . That is, in order to fix the bracket 44 (see FIG. 5), it is possible to utilize the fastening holes used for mounting the original rear bumper. Therefore, it is possible to suppress the decrease in manufacturing efficiency and strength of the dump truck 1 .

Furthermore, by lowering the arrangement of the rear bumper 36 , the track of the rear bumper 36 that rotates together with the cargo bed 20 can pass under the winch 40 . By lowering the arrangement of the rear bumper 36, interference between the rotating rear bumper 36 and the winch 40 can be avoided. In other words, by arranging the winch 40 inside the circular arc track T of the rear bumper 36, a configuration is established in which the winch 40 approaches the rear bumper 36 located at the rear end of the dump truck 1 in the longitudinal direction. In this manner, a layout in which the winch 40 is naturally arranged near the rear end of the dump truck 1 can be realized, and the aforementioned effect (2) can be reasonably obtained.

(4) The load receiving platform 33 in the upright posture also serves as a door (rear wall of the loading platform 20) that closes the rear opening of the loading platform 20. When the loading platform 33 is tilted backward, it continues to the floor surface of the loading platform 20, so when the loading platform 20 is tilted backward as shown in FIG. In other words, the load-receiving platform 33 plays a role of a chute extending from the floor surface of the loading platform 20 to near the ground, so that the garbage discharged from the loading platform 20 can be guided to the target discharge position.

(5) Since the winch 40 is positioned at the center of the vehicle width, it becomes easier to tow the garbage G to a position closer to the center of the dump truck 1 in the vehicle width direction. Therefore, it becomes easy to place the refuse G on the center of the load receiving table 33 both when the waste G is placed on the load receiving table 33 by the winch 40 and when it is placed manually.

Therefore, in the process of lifting up the load-receiving table 33, the loading operation of the garbage G can be satisfactorily performed without biasing the load to either the left or the right side of the dump truck 1.例文帳に追加In particular, when the dump truck 1 is parked on an uneven ground or the like to perform work, it is preferable that the weight balance is well balanced and the stability is improved. In addition, since the winch 40 is provided in the center of the width of the vehicle, even if the direction in which the winch rope 41 is paid out swings to the left or 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 moved by the vehicle after towing. It is preferable because it can be drawn to the width center position.

(6) The chassis frame 12 is provided with the shaft hole 15 through which the rotating shaft 25 that serves as the tilting fulcrum of the loading platform 20 passes. In other words, the dump truck 1 of this embodiment has no so-called sub-frame because it has a structure in which the loading platform 20 is connected to the chassis frame 12 via the rotating shaft 25 . In this way, the floor of the cargo bed 20 is lowered by the amount corresponding to the absence of the subframe, and the dimension in the height direction of the cargo bed 20 can be increased to increase the volume of the cargo bed. This allows more waste to be collected and transported.

In addition, the center of gravity of the dump truck 1 is lowered, and the stability during traveling is enhanced. However, the space for providing the winch 40 is limited in the configuration of the present embodiment as compared with the configuration in which the subframe exists. However, as described above, the ground clearance can be lowered, and furthermore, the position of the upper part of the winch 40 is lower than the position of the upper part of the chassis frame 12, so that the sub-frame excellent in running stability etc. The winch 40 can be installed without difficulty in spite of the less structure.

-Modification-
There are various types of dumping mechanisms for dump trucks other than the mechanisms described in the present embodiment. An example is a so-called three-rotation dump in which the tilting direction is switched between three directions. The same effect can be obtained by mounting the winch 40 and the load-receiving platform lifting device 30 on a dump truck having a three-turn dumping function, like the dump truck 1 of the present embodiment.

In addition, there are various types of loading platform lifting devices. For example, although a configuration in which the slider 32 is driven using a sheave and a wire is illustrated, a configuration using a chain instead of the wire and a sprocket instead of the sheave, for example, is also possible. In addition, for example, a load receiving platform lifting device (for example, JP-A-2010-155600, JP-A-2005-289150) that accommodates the loading platform inside the packing box can also be applied. If there is enough space, it is conceivable to apply a rotating retractable load receiving platform lifting device (Japanese Patent Application Laid-Open No. 2020-50131) that slides the load receiving platform and retracts and stores it under the vehicle frame. It is also conceivable to apply a rotating retractable load receiving platform lifting device (Japanese Patent Application Laid-Open No. 2010-52569) that rotates the load receiving platform and stores it in the lower part of the vehicle frame. In addition, even in the case of a load-receiving platform elevating device that raises and stores the load-receiving platform at the rear of the loading platform, there is a device in which the load-receiving platform is raised and lowered by a rotating arm instead of moving up and down along the post ( For example, JP-A-2008-189189, JP-A-2004-224082). It is also conceivable to apply these loading platform lifting devices.

Further, the design of the winch 40 can be appropriately changed as long as the same effect can be exhibited. For example, it is possible to change the design such that the wire rope 41 is made of a different kind of cord-like body, or that the member for fixing the winch 40 or the structure thereof is changed.

Also, although the configuration in which the winch 40 is provided at the rear portion of the chassis frame 12 has been illustrated, if the winch 40 can be arranged at the rear portion (near the rear end) of the vehicle 10, the member supporting the bracket 44 that supports the winch 40 can be replaced by the chassis frame. It doesn't have to be 12. For example, when the above-described subframe is provided, a configuration in which the bracket 44 is fixed to the rear portion of the subframe is also conceivable. In some cases, a structure in which the bracket 44 is fixed to the loading platform 20, the post 31, or the like can be considered.

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

Claims (6)

a loading platform tiltably mounted on the upper part of a chassis frame whose longitudinal direction is the longitudinal direction of the vehicle;
a load-receiving platform elevating device comprising a load-receiving platform capable of moving up and down between the floor surface of the loading platform and the ground;
A dump truck comprising a winch provided on the chassis frame and capable of withdrawing a cord-like body to the rear side of the vehicle. In the dump truck of claim 1,
The dump truck, wherein the winch is arranged at the rear of the vehicle so that the ground clearance is lower than the chassis frame. In the dump truck of claim 2,
The load-receiving table lifting device is
Left and right posts provided at the rear part of the loading platform for guiding the lifting movement of the loading platform;
a rear bumper having both ends supported by lower portions of the left and right posts so as to be positioned lower than the winch;
The dump truck, wherein the winch is arranged close to the rear bumper in the front-rear direction so as to be positioned inside a track of the rear bumper that rotates as the cargo bed tilts. In the dump truck of claim 3,
The loading platform has left and right side walls and is open at the rear,
The dump truck, wherein the load-receiving platform is configured to be able to stand up, and serves also as a rear wall of the loading platform in an upright state. In the dump truck according to any one of claims 1-4,
A dump truck in which the winch is provided below the chassis frame via a support member. In the dump truck according to any one of claims 1-5,
A dump truck in which the chassis frame is provided with a shaft hole through which a rotating shaft serving as a tilting fulcrum of the loading platform passes.

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