JP2002211448A - Powered carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the rigidity of a side gate forming a deck and increase an efficiency for storing sediment on the deck. SOLUTION: An upper side frame body 45C forming the side gate 45 of the deck 41 is formed of a lower side surface 45C1, an outer side surface 45C2, and an inner side sloped surface 45C3 into a generally triangular closed section structure. Since the upper end part of the side gate 45 is formed into a sharp angle part 45C4 with a high rigidity, even if the bucket of a hydraulic excavator collides with the upper part of the side gate 45, an impact load can be received by the angle part 45C4, and the side gate can be suppressed from being deformed. Also, even if a part of the sediment discharged from the bucket onto the deck 41 is dropped on the side gate 45, the sediment can be guided to the inside of the deck 41 along the inner side sloped surface 45C3, and the efficiency for storing the sediment onto the deck 4 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transport vehicle suitable for transporting earth and sand excavated using, for example, a hydraulic excavator to a desired earth discharging site.

[0002]

2. Description of the Related Art In general, a power carrier for transporting earth and sand excavated by using a hydraulic excavator or the like to a desired dumping place includes a self-propelled traveling body, and a body frame provided on the traveling body. And a cargo bed provided on the vehicle body frame and containing a conveyed object such as earth and sand.

[0003] A conventional power carrier of this type will be described with reference to FIGS. 9 to 12.

[0004] In the drawing, reference numeral 1 denotes a swing type tracked power carrier according to the prior art. The power carrier 1 includes a tracked lower traveling body 2 and a turning device 3 on the lower traveling body 2. A vehicle body frame 8 described below, which is provided so as to be capable of turning through, and a loading platform 21 described later provided on the vehicle body frame 8 are roughly configured.

The lower traveling body 2 includes a track frame 4, left and right driving wheels 5 provided at a front end of the track frame 4 and driven by a traveling motor (not shown), and a track frame 4. The left and right idler wheels 6 rotatably provided on the rear end side of the vehicle and the left and right crawler belts 7 wound around the drive wheel 5 and the idler wheel 6. The lower traveling body 2 travels on uneven terrain, muddy ground, and the like by driving the crawler belt 7 with the driving wheels 5.

[0008] Reference numeral 8 denotes a body frame provided on the undercarriage 2 so as to be able to turn via a turning device 3. The body frame 8 includes left and right vertical beams 8 A extending forward and rearward, and left and right vertical beams 8 A. A plurality of horizontal beams (not shown) extending in the right direction and connecting the vertical beams 8A, and a frame-shaped support frame provided on the front side of the vertical beams 8A and supporting a cab 9, a power unit 10, and the like described later. 8
B and has a strong frame structure.

Reference numeral 9 denotes a cab provided on a support frame 8B of the vehicle body frame 8, and the cab 9 defines a cab. In the cab 9, a driver's seat on which a worker sits, a traveling lever, and the like (all not shown) are arranged.

A power unit 10 is located on the right side of the cab 9 and provided on a support frame 8B of the body frame 8.
The power unit 10 is generally constituted by an engine 11 and a hydraulic pump 12 driven by the engine 11. Here, the hydraulic pump 12 is used to supply pressure oil to a traveling motor of the lower traveling body 2, a swing motor (not shown) of the swing device 3, a loading platform elevating cylinder 27 described below, and the like. Further, a cooling device 13 is disposed in front of the engine 11, and the cooling device 13 includes a radiator 14 for cooling the engine 11, an oil cooler 15 for cooling pressure oil discharged from the hydraulic pump 12, and the like. . Then, the power unit 10 and the cooling device 1
3 is arranged in a state of being arranged in series in the front and rear directions, and is covered by the engine cover 16.

Reference numeral 17 denotes a hydraulic oil tank provided on the support frame 8B of the vehicle body frame 8 at the right side of the power unit 10. The hydraulic oil tank 17 includes a traveling motor of the lower traveling body 2 and a swing of the swing device 3. Motor, loading platform lifting cylinder 2
It stores the hydraulic oil supplied and discharged to the 7 and the like.

Reference numeral 18 denotes a fuel tank provided between the cab 9 and the loading platform 21 and provided on the support frame 8B of the vehicle body frame 8. The fuel tank 18 stores fuel supplied to the engine 11. is there.

Reference numeral 21 denotes a loading platform provided from the front and rear intermediate portions to the rear side of the vehicle body frame 8 for accommodating conveyed objects such as earth and sand. The loading platform 21 moves forward and backward on the vehicle body frame 8. Base frame 2 forming an extended support structure
2, a front guard 23 provided on the front side of the base frame 22 and extending in the left and right directions;
Side gates 25 and bottom plates 26 which are provided on the rear side
And the left and right side gates 25, 25 provided on both the left and right sides of the base frame 22 and extending in the forward and rearward directions. It is roughly constituted by a bottom plate 26 which is provided and forms a bottom surface of the loading platform 21.

As shown in FIG. 11, the base frame 22 includes left and right vertical beams 22A, 22A extending in the front and rear directions in parallel with each other, and extending from the vertical beam 22A in the left and right directions. A plurality of cross beams 22B whose sides are inclined obliquely upward,
.., 22B,...

On the other hand, the side gate 25 comprises a lower frame 25A, an intermediate connecting plate 25B, and an upper frame 2 as shown in FIG.
5C, the base frame 22 and the bottom plate 2
6 is fixed to the side end of the base member 6 by welding and extends in the front and rear directions.

The lower frame 25A is a vertical inner surface 25 located inside the carrier 21 (on the side of the bottom plate 26).
A1, an outer side surface 25A2 serving as a vertical surface located outside the loading platform 21 (the side opposite to the bottom plate 26), a lower surface 25A3 serving as a horizontal surface, and an upper surface 25A serving as a horizontal surface as well.
4 form a square closed cross-sectional structure.

The intermediate connecting plate 25B located above the lower frame 25A is fixed to the upper surface 25A4 of the lower frame 25A and has a vertical inner surface 25B1 extending to the upper end of the upper frame 25C. And an outer plate 2 having a lower surface fixed to an upper surface 25A4 of the lower frame 25A and an upper surface formed as a vertical surface fixed to a lower surface 25C3 of the upper frame 25C to be described later.
5B2, and a rectangular closed cross section is formed between the upper surface 25A4 of the lower frame 25A and the lower surface 25C3 of the upper frame 25C.

Further, the upper frame 25C located above the intermediate connecting plate 25B has a vertical inner surface 25C1 located inside the carrier 21 and an outer surface 25C1 located outside the carrier 21 as a vertical surface. The side surface 25C2, the lower side surface 25C3 serving as a horizontal plane, and the upper side surface 25C4 also serving as a horizontal surface form a square closed cross-sectional structure.
The upper side surface 25C4 of the upper frame 25C is a horizontal surface having a width L in the left and right directions.

The rear end of each vertical beam 22A forming the base frame 22 is rotatably connected to the rear end of each vertical beam 8A forming the vehicle body frame 8.
A loading platform elevating cylinder 27 is provided between each of the vertical beams 22A and the vertical beams 8A of the vehicle body frame 8. Then, the loading / unloading cylinder 27 is extended and contracted, and the loading platform 21 is inclined with respect to the vehicle body frame 8, so that the loading platform 21 is
Is discharged from the sediment discharge opening 24.

The power carrier 1 according to the prior art has the above-described configuration. When carrying out work such as earth and sand using the power carrier 1, the power carrier 1 is caused to travel toward an excavation work place. For example, the vehicle body frame 8 is turned to move the loading platform 21 to a position near a hydraulic shovel or the like.

Then, after the earth and sand excavated by a hydraulic shovel or the like is discharged to the loading platform 21 and accommodated therein, the power carrier 1 is moved to a desired discharging location, and the loading platform lifting cylinder 27 is moved.
By inclining the loading platform 21 using, the earth and sand contained in the loading platform 21 can be discharged to a desired discharge location.

[0020]

By the way, in the power carrier 1 according to the prior art, the lower frame 25A and the upper frame 25C constituting the side gate 25 of the carrier 21 have rectangular closed cross-sectional shapes. Therefore, there are the following problems when transporting earth and sand.

First, when the earth and sand scooped by the bucket of the hydraulic shovel are discharged to the loading platform 21, the bucket of the hydraulic shovel swings upward and downward, and the side gate 2.
5 may hit the top. In this case, the upper frame 25C constituting the upper part of the side gate 25 is formed of a thin frame, and the upper side surface 25C4 is a horizontal plane having a width L. For this reason, there is a problem that not only the upper portion of the side gate 25 is easily deformed and damaged by the collision of the bucket, but also the frequency of collision of the bucket or the like increases.

When part of the earth and sand discharged from the bucket toward the loading platform 21 falls onto the upper part of the side gate 25, the upper surface 25C4 of the upper frame 25C constituting the upper part of the side gate 25 After the pile of earth and sand, the loading platform 21
It spills outside and is scattered. For this reason, there is a problem that not only the efficiency when the excavated earth and sand is stored in the bed 21 is reduced, but also a complicated operation for cleaning the earth and sand scattered outside the bed 21 is required.

Since the lower frame 25A constituting the lower part of the side gate 25 has a rectangular closed cross section,
Outer surface 25A2 and lower surface 25 of lower frame 25A
The portion where A3 intersects is a right-angled corner 25A5. For this reason, for example, when turning the body frame 8 in a narrow work site such as a forest road, or when inclining the loading platform 21 to discharge earth and sand, standing trees, workers, The corner 2 of the lower frame 25A is attached to a structure or the like.
When 5A5 collides, there is a problem that these trees, workers and the like receive a large impact.

The present invention has been made in view of the above-mentioned problems of the prior art, and can increase the rigidity of a side gate constituting a carrier, and can enhance the efficiency of storing earth and sand in the carrier. It is an object of the present invention to provide such a power carrier.

[0025]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a self-propelled traveling body, a vehicle body frame provided on the traveling body, and a conveyed object provided on the vehicle body frame. A base frame having a bottom plate, a front guard provided on the front side of the base frame, and side gates provided on both left and right sides of the base frame and extending forward and rearward. The present invention is applied to a power carrier equipped with:

A feature of the first aspect of the present invention is that the side gate has a lower closed-section structure located near the bottom plate and an intermediate closed-section structure located above the lower closed-section structure. And an upper closed cross-sectional structure located above the intermediate closed cross-sectional structure. An inner side surface of the upper closed cross-sectional structure is configured as a linear or arc-shaped inner inclined surface. .

With such a configuration, the upper end of the side gate can be formed as a highly rigid corner by the provision of the inner inclined surface in the upper closed-section structure. For this reason, even if, for example, a bucket of a hydraulic shovel collides with an upper portion of the side gate, it is possible to suppress the side gate from being deformed or damaged. Also, for example, even if part of the earth and sand discharged from the bucket of the hydraulic excavator onto the bed is guided to the upper part of the side gate, the earth and sand is guided into the bed along the inner inclined surface of the upper closed-section structure. It is possible,
Carrying materials such as earth and sand can be efficiently stored in the loading platform.

According to a second aspect of the present invention, the upper closed structure is
It has a substantially triangular closed cross-sectional structure composed of a horizontal lower surface, a vertical outer surface, and an inner inclined surface.

According to this structure, the upper portion of the side gate is formed as a sharp corner to increase rigidity, so that deformation and damage due to collision of a bucket or the like of the hydraulic shovel can be suppressed. Also, since almost the entire area from the outer surface to the lower surface of the upper closed cross-section structure is the inner inclined surface, most of the earth and sand discharged on the side gate is guided into the loading platform along the inner inclined surface. be able to.

According to a third aspect of the present invention, the outer surface of the lower closed cross-section structure constituting the side gate is formed as a linear or arcuate outer inclined surface.

With this configuration, the lower part of the side gate has an outer inclined surface having no corners. Therefore, for example, when the vehicle body frame is turned or the load is discharged by tilting the bed, the lower part of the side gate is present around the side gate. Even if the lower part of the side gate collides with a standing tree, a worker, or the like, the impact given to the standing tree, the worker, or the like can be reduced.

According to a fourth aspect of the present invention, the lower closed cross-section structure comprises:
It has a substantially triangular closed cross-sectional structure composed of a vertical inner surface, a horizontal upper surface, and an outer inclined surface.

According to a fifth aspect of the present invention, the lower closed cross-section structure comprises:
The inner side surface that has become a vertical surface, the upper side surface that has become a horizontal surface, and a linear or arc-shaped outer inclined surface have a substantially triangular closed cross-sectional structure, and the intermediate closed cross-sectional structure has a vertical surface. The closed side cross-section structure has a quadrilateral shape consisting of four sides of a side surface and an outer side surface, and a lower side surface and an upper side surface which are horizontal surfaces. And a substantially triangular closed cross-sectional structure with a straight or arc-shaped inner inclined surface, the upper side surface of the lower closed cross-sectional structure abuts the lower side surface of the intermediate closed cross-sectional structure, The upper surface is configured to contact the lower surface of the upper closed-section structure.

With this configuration, the upper surface of the lower closed-section structure and the lower surface of the intermediate closed-section structure are in surface contact with each other, and the upper surface of the intermediate closed-section structure and the upper closed-section structure are Since the lower side surface is in surface contact, the coupling force between these closed cross-section structures is increased, and the rigidity of the entire side gate can be increased.

According to a sixth aspect of the present invention, the vehicle body frame is provided so as to be capable of turning on a running body via a turning device.

With this configuration, it is possible to increase the rigidity of the side gate of the carrier provided on the vehicle body frame that turns on the traveling body, and it is also possible to improve the efficiency when the cargo such as earth and sand is accommodated in the carrier. Can be increased.

According to a seventh aspect of the present invention, the vehicle body frame is fixedly provided on the traveling body.

With this configuration, the rigidity of the side gate of the carrier provided on the vehicle body frame fixed on the traveling body can be increased, and the load of the cargo such as earth and sand can be stored in the carrier. Efficiency can be increased.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power carrier according to the present invention will be described below in detail with reference to FIGS. In the present embodiment, the same components as those in the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a swing type tracked power carrier according to the present embodiment, which is substantially the same as that of the prior art, and includes a tracked lower traveling body 2; Although the vehicle body frame 8 is provided on the undercarriage 2 so as to be capable of turning via a turning device 3 and a carrier 41 described later provided on the body frame 8, the carrier 4
1 is different from the prior art.

Reference numeral 41 denotes a carrier according to the present embodiment, which is provided from the intermediate portion in the front and rear directions to the rear side of the vehicle body frame 8 to accommodate a conveyed object such as earth and sand. Is used in the present embodiment instead of.

Here, as shown in FIGS. 2 to 4, the loading platform 41 is provided on the base frame 42 as a support structure extending forward and backward on the body frame 8, and provided on the front side of the base frame 42. A front guard 43 extending in the left and right directions, a sediment discharge opening 44 provided on the rear side of the base frame 42 and surrounded by rear ends of side gates 45 and a bottom plate 46 to be described later; Left of
It is generally constituted by left and right side gates 45, 45 provided on the right side and extending in the forward and rearward directions, and a bottom plate 46 provided on the base frame 42 and serving as the bottom surface of the loading platform 41. It forms an accommodation space.

The base frame 42 includes left and right vertical beams 42A, 42A extending in the front and rear directions in parallel with each other.
, And a plurality of horizontal beams 42B, 42B,... Extending from the vertical beam 42A in the left and right directions and having the tip side inclined obliquely upward, so as to form a strong frame structure. The rear end of each vertical beam 42A is rotatably connected to the rear end of each vertical beam 8A constituting the vehicle body frame 8, and each vertical beam 42A of the base frame 42 and each vertical beam of the vehicle body frame 8 are connected. A loading platform elevating cylinder 27 is provided between the cylinder 27 and 8A.

As shown in FIG. 5, the side gate 45 includes a lower frame 45A, which will be described later, and an intermediate frame 45B.
And an upper frame 45C, which are fixed to the lateral beams 42B of the base frame 42 and the side ends of the bottom plate 46 by welding and extend in the front and rear directions.

45A is a lower frame as a lower closed-section structure located near the bottom plate 46. The lower frame 45A is
A vertical inner surface 45A1 located inside the loading platform 41 (the bottom plate 46 side) and a horizontal upper surface 45A2 extending from the upper end side of the inner surface 45A1 to the outside of the loading platform 41.
And an outer inclined surface 45 </ b> A <b> 3 located outside the loading platform 41 (on the side opposite to the bottom plate 46), has a substantially triangular closed cross-sectional structure. And the lower frame 45A is
The inner surface 45A1 is firmly fixed by welding to the side end of the cross beam 42B constituting the base frame 42.

Here, the outer inclined surface 45A3 is an arc-shaped inclined surface which is inclined obliquely so as to gradually separate from the bottom plate 46 from below to above, and is formed substantially over the entire area from the inner side surface 45A1 to the upper side surface 45A2. Have been. Thereby, the lower part of the side gate 45 is chamfered by the outer inclined surface 45A3 having no corner, and when the vehicle body frame 8 is turned on the lower traveling body 2 or when the loading platform 41 is inclined to discharge earth and sand. The lower part of the side gate 45 (outside slope 4
Even if 5A3) collides, it is possible to reduce the impact given to these trees, workers, structures and the like.

Reference numeral 45B denotes an intermediate frame as an intermediate closed-section structure disposed above the lower frame 45A.
5B is a vertical inner surface 45B1 and an outer surface 45B.
B2, the lower surface 45B3 and the upper surface 45 that have become horizontal surfaces
It has a quadrangular (rectangular) closed cross-sectional structure consisting of four sides with B4. The intermediate frame 45B is firmly fixed to the lower frame 45A by welding while the lower surface 45B3 is in surface contact with the upper surface 45A2 of the lower frame 45A, and the inner surface 45B1 is fixed to the lower frame 45A. It is fixed to the side end of the cross beam 42B constituting the base frame 42 by welding.

Reference numeral 45C denotes an upper frame as an upper closed-section structure disposed above the intermediate frame 45B.
5C is a lower surface 45C1 that is a horizontal surface, an outer surface 45C2 that is a vertical surface located outside the loading platform 41 (the side opposite to the bottom plate 46), and an inner surface located inside the loading platform 41 (the bottom plate 46 side). The inclined surface 45C3 has a substantially triangular closed cross-sectional structure. Then, the upper frame 45
C is the lower surface 45C1 of which is the upper surface 4 of the intermediate frame 45B.
While being in surface contact with 5B4, it is firmly fixed to the intermediate frame 45B by welding.

Here, the inner inclined surface 45C3 is an arc-shaped inclined surface that is inclined obliquely so as to gradually approach the bottom plate 46 from the upper side to the lower side.
It is formed almost all over 5C2. This allows
The upper end of the side gate 45 has a sharp rigid corner 45
C4, the configuration is such that deformation, damage, and the like when a bucket or the like of a hydraulic shovel collides can be suppressed, and the frequency of collision of the bucket or the like can be reduced.

When a part of the earth and sand discharged from the bucket toward the loading platform 41 falls on the side gate 45, the soil is removed along the inner inclined surface 45C3.
It is configured to be able to be guided inside and to prevent earth and sand released on the side gate 45 from spilling out of the loading platform 41.

The power carrier 31 according to the present embodiment has the carrier 41 as described above, and when carrying work such as earth and sand using the power carrier 31, the power carrier 3
The vehicle 1 is moved toward the excavation work place, and, for example, the body frame 8 is turned to move the loading platform 41 to the vicinity of a hydraulic excavator or the like (not shown).

After the earth and sand excavated by a hydraulic shovel or the like is discharged to the loading platform 41 and accommodated therein, the power carrier 31
To the desired discharge area, and the loading / unloading cylinder 2
7, the loading platform 41 is inclined.
Can be discharged from the earth and sand discharge opening 44 to a desired earth discharging place.

Here, when the earth and sand scooped by the bucket of the hydraulic shovel are discharged to the loading platform 41, the bucket of the hydraulic shovel swings up and down and collides with the upper portion of the side gate 45 of the loading platform 41. There is.

However, in the carrier 41 according to the present embodiment, the upper frame 45C constituting the upper part of the side gate 45
In addition, the upper end of the side gate 45 is formed to have a high rigidity and a sharp corner 45C by forming an inner inclined surface 45C3 which is inclined so as to gradually approach the bottom plate 46 from above to below.
It is 4.

Therefore, even if the bucket collides with the upper portion of the side gate 45, the impact load received from the bucket can be received by the highly rigid corner portion 45C4, and the side gate 45 is not deformed or damaged. Can be suppressed. In addition, since the corner 45C4 has almost no width in the left and right directions, the frequency of collision of buckets or the like can be reduced. As a result, deformation, damage, and the like of the side gate 45 can be suppressed as compared with the related art, and repair costs and the like can be reduced.

Even if part of the earth and sand discharged from the bucket toward the loading platform 41 falls onto the side gate 45, the earth and sand is removed from the inside of the upper frame 45C constituting the upper part of the side gate 45. Loading bed 4 along inclined surface 45C3
1 can be guided. Thereby, the loading platform 41
The amount of earth and sand that spills outside can be reduced, and the efficiency of storing earth and sand in the loading platform 41 can be increased. Further, a complicated operation for cleaning the earth and sand scattered to the outside of the loading platform 41 can be eliminated, and the workability when transporting the earth and sand can be improved.

Further, the side gate 45 includes a lower frame 45A having a triangular closed cross section, an intermediate closed cross section 45B having a quadrangular closed cross section, and an upper side having a triangular closed cross section. Since the intermediate frame 45B is constituted by the frame 45C, the intermediate frame 45B is connected to the lower side surface 45B3 of the lower frame 45A.
The lower frame 45 is brought into surface contact with the upper side surface 45A2.
A, and the upper frame 45C is fixed firmly to the lower side surface 45C.
C1 can be firmly fixed to the intermediate frame 45B while the C1 is in surface contact with the upper side surface 45B4 of the intermediate frame 45B. Therefore, each of these closed-section structures 45A, 45B,
The coupling force between the side gates 45C is increased, and the rigidity of the entire side gate 45 can be increased.

Next, when the vehicle body frame 8 is turned at a narrow work site such as a forest road, or when the bed 41 is inclined to discharge earth and sand, standing trees,
The lower portion of the side gate 45 may collide with an operator, a structure, or the like.

However, in the loading platform 41 according to the present embodiment, the lower frame 45A constituting the lower portion of the side gate 45 is provided.
Is provided with an outer inclined surface 45A3, so that the lower part of the side gate 45 is chamfered in an arc shape. For this reason, a highly rigid corner portion is not formed at the lower portion of the side gate 45, and even if the lower portion (the outer inclined surface 45A3) of the side gate 45 collides with a tree, a worker, a structure, or the like, the tree is not damaged. In addition, it is possible to reduce the impact given to the worker and the like, and to enhance the safety at the time of the earth discharging operation.

In the above-described embodiment, the turning type power carrier 31 in which the body frame 8 is turnably provided on the lower traveling body 2 via the turning device 3 has been described as an example. The present invention is not limited to this. For example, as in a modified example shown in FIG. 6, the above-described loading platform 41 is mounted on a non-slewing type power carrier 51 provided with the body frame 8 fixed on the lower traveling body 2. A configuration may be provided.

In the above-described embodiment, the outer inclined surface 45A of the lower frame 45A constituting the side gate 45 is formed.
3 is configured as an arc-shaped inclined surface, and the case where the inner inclined surface 45C3 of the upper frame 45C is configured as an arc-shaped inclined surface is taken as an example. However, the present invention is not limited to this. For example, as in a modification shown in FIG.
The upper frame body 45C 'is composed of a vertical inner surface 45A1', a horizontal upper surface 45A2 ', and a linear outer inclined surface 45A3'. A vertical outer surface 45C2 ',
It may be constituted by a linear inner inclined surface 45C3 '.

In the above-described embodiment, the lower frame 45A constituting the side gate 45 has the outer inclined surface 45A.
3 is provided, and the case where an inner inclined surface 45C3 is provided on the upper frame 45C is taken as an example. However, the present invention is not limited to this. For example, as in another modification shown in FIG.
The inner inclined surface 45C3 may be provided only on the upper frame 45C, and the lower frame 45A ″ may be formed by a closed cross-sectional structure having a square cross-sectional shape.

In the above-described embodiment, the loading platform 41
Although the case where the opening 44 for earth and sand discharge was provided in the rear side of the example was given as an example, the present invention is not limited to this. For example, instead of the opening 44 for earth and sand discharging, it can be opened and closed on the rear side of the loading platform. A configuration in which a lid is provided may be employed.

Further, in the above-described embodiment, the tracked power carrier 31 provided with the tracked lower traveling body 2 has been described as an example. However, the present invention is not limited to this. The present invention can also be applied to a power carrier equipped with a lower traveling body.

[0065]

As described above in detail, according to the first aspect of the present invention, the side gate of the loading platform is provided with the lower closed section structure located near the bottom plate and the upper side of the lower closed section structure. , And an upper closed cross-sectional structure located above the intermediate closed cross-sectional structure, wherein the inner side surface of the upper closed cross-sectional structure has a linear or arc-shaped inner inclined surface. With this configuration, the upper portion of the side gate can be a highly rigid corner.

For this reason, even if, for example, a bucket or the like of a hydraulic shovel collides with an upper portion of the side gate, deformation and damage of the side gate can be suppressed, and repair costs and the like can be reduced. Also, for example, even if part of the earth and sand discharged from the bucket of the hydraulic excavator onto the bed is guided to the upper part of the side gate, the earth and sand is guided into the bed along the inner inclined surface of the upper closed-section structure. be able to. For this reason, the amount of earth and sand that spills to the outside of the bed can be reduced, and the efficiency of storing conveyed objects such as earth and sand in the bed can be increased.

According to the second aspect of the present invention, the upper closed cross-section structure has a substantially triangular closed cross-sectional structure formed by a lower surface that is a horizontal plane, an outer surface that is a vertical surface, and an inner inclined surface. With such a configuration, the upper portion of the side gate is formed as an acute corner to increase rigidity, and deformation and damage due to collision of a bucket or the like of the hydraulic shovel can be reliably suppressed. Also, since almost the entire area from the outer surface to the lower surface of the upper closed cross-section structure is the inner inclined surface, most of the earth and sand discharged on the side gate is guided into the loading platform along the inner inclined surface. be able to.

According to the third aspect of the present invention, since the outer side surface of the lower closed cross-sectional structure constituting the side gate is formed as a linear or arcuate outer inclined surface, for example, the vehicle body frame is turned. Also, even if the lower part of the side gate collides with the surrounding trees, workers, etc., when the cargo is discharged by tilting the bed, the impact given to these trees, workers, etc. can be reduced.

According to the fourth aspect of the present invention, the lower closed cross-sectional structure has a substantially triangular closed cross-sectional structure formed by the vertical inner surface, the horizontal upper surface, and the outer inclined surface. Therefore, almost the entire region from the inner surface to the upper surface of the lower closed-section structure can be formed as an outer inclined surface having no corners.

According to the fifth aspect of the present invention, the lower closed cross-sectional structure is formed into a substantially triangular closed cross-sectional structure by the vertical inner surface, the horizontal upper surface, and the outer inclined surface. The intermediate closed cross-section structure is constituted by a square closed cross-sectional structure consisting of four sides of a vertical inner surface and an outer surface, and a horizontal lower surface and an upper surface,
The upper closed cross-section structure is configured to have a substantially triangular closed cross-sectional structure including a horizontal lower surface, a vertical outer surface, and an inner inclined surface. As a result, the upper side surface of the lower closed section structure comes into surface contact with the lower side surface of the intermediate closed section structure, and the upper surface of the intermediate closed section structure comes into surface contact with the lower surface of the upper closed section structure. The coupling force between these closed cross-section structures is increased, and the rigidity of the entire side gate can be increased.

According to the sixth aspect of the present invention, the vehicle body frame is provided on the traveling body so as to be pivotable via the pivoting device. Therefore, the power carrier provided with the body frame pivotably provided on the traveling body is provided. Also in a car, the rigidity of the side gate of the cargo bed provided on the vehicle body frame can be increased, and the efficiency of storing cargo such as earth and sand in the cargo bed can be increased.

Further, according to the seventh aspect of the present invention, the vehicle body frame is fixedly provided on the traveling body. Therefore, even in a power carrier having the vehicle body frame fixed on the traveling body, the vehicle body frame is provided on the vehicle body frame. The rigidity of the side gate of the loaded carrier can be increased, and the efficiency of storing a load such as earth and sand in the carrier can be increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a power carrier according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing the carrier in FIG. 1 as a single body;

FIG. 3 is an enlarged plan view showing a single carrier in FIG. 1;

FIG. 4 is an enlarged cross-sectional view of the bed seen from a direction indicated by arrows IV-IV in FIG. 3;

FIG. 5 is an enlarged sectional view of a main part, showing the side gate in FIG. 4 in an enlarged manner.

FIG. 6 is a front view showing a modified example of the power carrier as viewed from the same position as in FIG. 1;

FIG. 7 is an enlarged sectional view showing a modification of the side gate as viewed from the same position as in FIG. 5;

FIG. 8 is an enlarged cross-sectional view showing another modification of the side gate viewed from the same position as in FIG. 5;

FIG. 9 is a front view showing a power carrier according to the related art.

FIG. 10 is a plan view of a power carrier according to the related art.

FIG. 11 is an enlarged plan view showing a single carrier in FIG. 10;

FIG. 12 shows a side gate of a carrier according to the prior art;
It is the expanded sectional view which expanded from the arrow XII-XII direction in the middle.

[Explanation of symbols]

Reference Signs List 2 lower traveling body 3 turning device 8 body frame 41 carrier 42 base frame 43 front guard 44 earth and sand discharge opening 45 side gate 45A, 45A ', 45A "lower frame (lower closed sectional structure) 45A1, 45A1' Inner surface 45A2, 45A2 'Upper surface 45A3, 45A3' Outer inclined surface 45B Intermediate frame (intermediate closed-section structure) 45B1 Inner surface 45B2 Outer surface 45B3 Lower surface 45B4 Upper surface 45C, 45C 'Upper frame (upper closed structure) Body) 45C1, 45C1 'Lower surface 45C2, 45C2' Outer surface 45C3, 45C3 'Inner inclined surface 46 Bottom plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiyoshi Hirasawa 5600-1 Ochiwakagi Nanakubo, Higashine-shi, Yamagata Prefecture Inside Yamagata Hitachi Construction Machinery Co., Ltd. 5600-1 Yamagata Hitachi Construction Machinery Co., Ltd. (72) Inventor Hiroshi Abe 5600-1 Yamagata Hitachi Construction Machinery Co., Ltd.

Claims (7)

[Claims] 1. A self-propelled traveling body, a vehicle body frame provided on the traveling body, and a carrier provided on the vehicle body frame for accommodating goods, the carrier being a base frame having a bottom plate And a front guard provided on the front side of the base frame, and side gates provided on both left and right sides of the base frame and extending forward and rearward, wherein the side gate comprises: A lower closed cross-sectional structure located in the vicinity of the bottom plate, an intermediate closed cross-sectional structure positioned above the lower closed cross-sectional structure, and an upper closed cross-sectional structure positioned above the intermediate closed cross-sectional structure Wherein the inner side surface of the upper closed cross-section structure is formed as a linear or arcuate inner inclined surface. 2. The upper closed structure having a substantially triangular closed structure formed by a lower surface that is a horizontal plane, an outer surface that is a vertical surface, and the inner inclined surface. The power carrier described in. 3. The power carrier according to claim 1, wherein the outer side surface of the lower closed cross-section structure forming the side gate is formed as a linear or arcuate outer inclined surface. 4. The lower-side closed cross-sectional structure has a substantially triangular closed cross-sectional structure including a vertical inner surface, a horizontal upper surface, and the outer inclined surface. 3. The power carrier according to 3. 5. The lower closed cross-sectional structure has a substantially triangular closed cross-sectional structure including a vertical inner surface, a horizontal upper surface, and a linear or arc-shaped outer inclined surface. The intermediate closed-section structure has a square closed-section structure including four sides of a vertical inner surface and an outer surface, and a lower surface and an upper surface that have become horizontal surfaces. , A lower surface that has become a horizontal plane, an outer surface that has become a vertical surface, and a linear or arc-shaped inner inclined surface that forms a substantially triangular closed cross-sectional structure, and the upper surface of the lower closed cross-sectional structure is intermediate. The power carrier according to claim 1, wherein the power transport vehicle is configured to abut on a lower surface of the closed-section structure, and an upper surface of the intermediate closed-section structure abuts on a lower surface of the upper-closed structure. 6. The power carrier according to claim 1, wherein the vehicle body frame is configured to be capable of turning on the traveling body via a turning device. 7. The power carrier according to claim 1, wherein the vehicle body frame is fixedly provided on the traveling body.