JP2020082880A - Cargo box mounted to vehicle - Google Patents

Abstract

To provide a constitution which can suppress complication of a worker even if performing any operation to a cargo box having a tailgate which is mounted to a vehicle, and operable in both an upper opening motion and a lower opening motion, and can bring the tailgate to an erection state with respect to a floor face part by easily lifting the tailgate by energization force when closing the upward-opened tailgate.SOLUTION: A cargo box having a tailgate 14 which can be inclined by a damper device arranged at a vehicle body frame, and upwardly opened and downwardly opened from an erection state is set as an object. An energization member for generating energization force to a direction in which the tailgate is turned to an upper side by upward-opening operation of the tailgate is firmly set between a tail panel 15 vertically arranged with respect to a rear end part of a flow rate face part and the tailgate, and brought into an engagement state with respect to the energization member so as to generate the energization force. An engagement part 1423a which is brought into a non-engagement state with respect to the energization member by operation for causing the upward-opened tailgate to take a desired posture while being turned to an upper side, or by downward-opening operation is arranged at the tailgate.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luggage box mounted on a vehicle, and more particularly to a luggage box mounted on a vehicle having a dumping function and having a tailgate capable of both upward opening and downward opening operations.

2. Description of the Related Art It is known that a loading box mounted on a vehicle can be tilted (dumped) by a dumping device provided on a vehicle body frame and, for example, earth and sand discharged on the rear side of the vehicle can be loaded by the tilting.

In such a packing box, the tailgate, which is erected on the floor surface, has an "upward-opening" operation that rotates about the lower hinge and an "downward-opening" operation that rotates about the upper hinge. Both are possible. Both of the operations are possible because the load box is mounted on the vehicle having the dump function, and is significantly different from the one mounted on the vehicle not having the dump function. In other words, the tailgate, which is capable of both operations, uses the dumping function to release the loaded soil, etc., and releases the locked state that secures the lower part and opens downward, and the soil opened from the area opened by this downward opening. Is discharged. On the other hand, when the tailgate is manually opened upward, the tailgate is in a locked state where the lower part is firmly fixed.

Although it is a highly functional packing box that can perform both operations, the work of opening the tailgate upward and the work of returning the opened tailgate to the standing state are performed manually. As described above, since earth and sand are often loaded in the luggage box, the tailgate itself is made of iron and has a large thickness, which is very heavy. Then, the idea which can reduce the load of the operator who performs manually is also introduced (for example, patent document 1, 2).

JP, 2008-052254, A JP, 2016-137787, A

Although the above-mentioned patent documents alleviate the load of the operation of lifting (closing) the operator by opening the upward-opening tailgate, there is still room for improvement in that work and operation remain largely complicated.

For example, in the case of Patent Document 1, although a long rod is used for the tailgate that opens upward, the rod itself is long and difficult to handle, and it is also necessary to insert it into the tailgate. Further, it is also necessary to take out and store the long rod. In addition, there must be a place to store the insert rod.

Further, in the case of Patent Document 2, the urging force generated in the upwardly opened tailgate is used to reduce the number of workers. However, the member that generates the urging force is rotationally supported at the time of upward opening. While being used as a member, it also hinders the downward opening operation when the tailgate is opened downward. Therefore, when the tailgate is opened downward, it is necessary to remove the member (rotational support member) that generates this biasing force. That is, the member must be manually attached and engaged with the tailgate by the operator during the upward opening operation, and disengaged by manually removing the member during the downward opening operation.

The present invention has been made in view of these points, and an operator can perform any operation on a luggage box that is mounted on a vehicle and has a tailgate that can perform both upward opening and downward opening operations. It is an object of the present invention to provide a configuration in which the tailgate that is opened upward can be easily lifted by a biasing force to stand up to the floor surface portion while suppressing the complexity of the above.

The present invention is directed to a luggage box mounted on a vehicle having a tailgate that can be tilted by a dump device provided on a vehicle body frame and that can be opened upward and downward from a state of standing upright with respect to the floor surface. The following means are used to solve the problems.

An urging force is generated between the tail panel vertically installed to the rear end of the floor surface portion and the tail gate by the upward opening operation of the tail gate in the direction in which the tail gate rotates upward. A biasing member is fixed and brought into engagement with the biasing member so as to generate the biasing force, while the downward opening operation or the upwardly opening tailgate is rotated upward to a desired posture. The tailgate is provided with an engagement portion that is brought into a non-engagement state with respect to the urging member by the operation.

With the packing box according to the present invention, when the operator manually returns the upwardly opened tailgate to perform an upward pivoting operation to close the tailgate, the workload is large in the following two points. Will be reduced. First, the load for lifting the tailgate by the biasing force of the biasing member is reduced. This merit is great in lifting a heavy tailgate because the load capacity of the load is required. Secondly, whether the engaging portion and the biasing member are in the engaged state or the non-engaged state can be switched by the turning operation of the tailgate. That is, even if an urging member is simply installed to reduce the lifting load described above, if the tailgate cannot be opened downward due to the installation of the urging member, the vehicle characteristics can be exhibited in the vehicle having the dump function. It is not preferable because it disappears. For this reason, if a separate work for removing the biasing member that functions at the time of upward opening is required at the time of downward opening, the operator's complexity will increase. However, as in the present invention, only the turning operation of the tailgate is required. If the engaging portion and the urging member can be brought into the engaged state or the non-engaged state, it is possible to control the presence or absence of the urging force only by the turning operation of the tailgate, and the operator is not complicated at all. I can't go up. Therefore, for a worker, in a luggage box having a tailgate capable of both upward opening and downward opening operations, without separately tying or untiing the lower portion of the tailgate according to the posture of the tailgate, The biasing force of the biasing member can always be easily obtained when the upper opened tailgate is set in the upright state and the closed state.

The "desired posture" of the tailgate described above means the posture of the tailgate at an angle (rotational angle) at which an operator expects an effect of reducing the lifting load when the tailgate is lifted from the upper open state. ), the operator can appropriately change the setting depending on the magnitude of the required urging force, in any of the postures in which the operator lifts the tailgate and returns (closes) it to the standing state.

Further, in the present invention, the urging member includes a shaft fixed to the tail panel and having a longitudinal direction in the vehicle width direction, and a spring portion wound around the shaft, and the spring portion. Is preferably provided with an extending portion extending in a direction intersecting with the winding axis, and the extending portion is pushed by the engaging portion to be brought into the engaged state.

Furthermore, the spring portion is provided in a state of being adjacent to a surface of the tail panel, and the engaging portion is provided in a state of being in contact with or adjacent to the extending portion in a state where the tail gate is in the upright state, Further, the tail panel may be provided with an opening formed by cutting out a region facing the extension.
Further, the present invention is particularly effective for a vehicle that can move rearward of the vehicle body frame with respect to the vehicle body frame so that the rear portion of the luggage box can come into contact with the ground.

Specifically, the body frame is a pair of left and right vehicle frames having a longitudinal direction in the vehicle front-rear direction, a tilting frame tiltably provided with respect to the vehicle frame, and a slide cylinder provided on the tilting frame. And the rear end is brought into a substantially grounded state by the extension of the slide cylinder.

When the above-mentioned ground contact state is reached, the tailgate is in contact with the ground, so the tailgate is in a lower position than when it is simply on the body frame. Since the load of (lifting work) becomes large, the configuration in which the biasing force can be easily obtained by the present invention is useful.

Like the luggage box mounted on the vehicle of the present invention, since the engaging portion provided on the tailgate can be switched to the engaged state or the non-engaged state with respect to the biasing member by changing the attitude of the tailgate, The lifting load of the opened tail gate can be reduced by the urging force, and no additional work is performed and the operation is not complicated due to the difference between the upper opening operation and the lower opening operation.

It is a side view of the dump truck showing the state where the luggage box concerning the embodiment of the present invention was carried. (A) is a rear view of the tailgate according to the embodiment of the present invention seen from the rear of the vehicle, (b) is an enlarged view showing a lower hinge portion of the tailgate, and (c) is a hinge shaft of the lower hinge. FIG. (A) is a rear view showing the biasing member as seen from the rear of the vehicle according to the embodiment of the present invention, (b) is a schematic development view showing each component of the biasing member, and (c) is a side view of the vehicle. It is a schematic side view which shows the biasing member. (A) is a side view showing a vehicle according to a second embodiment of the present invention and a luggage box mounted on the vehicle, (b) is a side view of the same embodiment when the luggage box is grounded It is a figure. FIG. 7A is a perspective view of a main part of a vehicle body frame of a vehicle according to a second embodiment of the present invention, and FIG. 8B is an enlarged view of a main part of a front end portion thereof. It is a principal part perspective view which shows the slide mechanism of the luggage box and vehicle body frame which concerns on 2nd Embodiment of this invention.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a vehicle DT having a maximum load weight of 4 tons when the load box 1 according to the first embodiment is mounted. In this vehicle DT, a luggage box 1 is mounted on a vehicle body frame 2 having a longitudinal direction in the vehicle front-rear direction (horizontal direction in the figure) via a hinge 2a so as to be tiltable (dumpable) rearward of the vehicle. The tilting of the luggage box 1 is performed by the dump device 3 provided on the vehicle body frame 2 and located between the luggage box 1 and the vehicle body frame 2. By extending the dump cylinder of the dump device 3, the load box 1 tilts rearward of the vehicle as indicated by the alternate long and short dash line around the hinge 2a (arrow A1).

The packing box 1 includes a floor surface portion 11, a front panel (front wall) 12 standing on the front end of the floor surface portion 11, side gates 13 standing on the left and right sides of the floor surface portion 11, and a rear end of the floor surface portion 11. And a tailgate 14 installed upright. The tailgate 14 is provided with an upper hinge 140 at the upper end and a lower hinge (not shown) at the lower end, and these hold the tailgate 14 in a secured and upright state. The tailgate 14 is appropriately secured using an upper hinge 140 and a lower hinge (not shown), and when the securing by the upper hinge 140 is released (the securing by the lower hinge is maintained), the operator Can be manually opened upward, and when the fastening by the lower hinge is released (while the fastening by the upper hinge 140 is maintained), the upper portion as shown by the one-dot chain line is shown along with the tilting movement of the packing box 1. While being supported by the hinge 140, a downward opening operation is performed in which the hinge 140 is rotated around the supporting point (arrow A2). Note that, although details will be described later, in the present invention, a biasing member (not shown) is also provided which is capable of reducing the load when the tailgate 14 is opened upward and the operator manually raises the tailgate 14. Has been.

The upper hinge 140 includes an upper hinge shaft 1402 horizontally provided on an upper end portion of the tailgate 14 via an upper hinge bracket 1401 and an upper hinge shaft 1402 provided at an upper portion of a rear end of the side gate 13 so as to bind or secure the upper hinge shaft 1402. It is a known one composed of a lashing metal fitting 1403 that can be released from tying. Although a detailed view is omitted, the fastening metal fitting 1403 is a receiving metal fitting having a U-shaped fixing groove portion that opens toward the rear of the vehicle, and a receiving metal fitting having the same shape as the U-shaped fixing groove portion with the receiving metal fitting. On the other hand, a known configuration including a rotation groove portion that is rotatably supported with the vehicle width direction as the axial center direction, and an operation handle that is equipped with this rotation groove portion at the tip and that can be vertically rotated by an operator gripping the operation handle. Is becoming The upper hinge shaft 1402 can be fixed or unfixed by the operator operating this operation handle to rotate the rotation groove. The upper hinge shaft 1402 functions as a rotation axis (support point) in the above-described downward opening operation.

The lower hinge is provided below the tailgate 14, and will be specifically described with reference to FIG. 2 showing the tailgate 14 when the vehicle DT is viewed from the rear. For convenience of explanation, the tailgate 14 and the tail panel 15 vertically extending from the floor surface portion 11 are shown, but the side gate 13, the front panel 12, and the like are omitted.

As shown in FIG. 2A, the lower hinge according to the present embodiment is provided with lower hinges 141 on the left and right sides at the lower end of the tailgate 14. Further, at a position near the lower hinge 141, a biasing member 142 configured to generate a biasing force when an operator manually raises the tailgate 14 that has been opened upward is placed. There is. The lower hinge 141 and the urging member 142 are provided in a state where the left and right sides are symmetrical with respect to the vehicle center.

The lower hinge 141 is provided at a position closer to the inner side with respect to the end portion in the vehicle width direction, has a known configuration, and is horizontally arranged at the lower end portion of the tailgate 14 via a pair of left and right lower brackets 141a. A fixed lower hinge shaft 141b, a guide plate 141c having an engaging recessed portion provided on the rear end rear surface side of the floor surface portion 11 (see FIG. 1) of the luggage box 1 and capable of engaging the lower hinge shaft 141b, and a guide The hook 141d is provided for pressing the lower hinge shaft 141b engaged with the engaging recess of the plate 141c from above. A hinge pin (not shown) having a longitudinal direction in the vehicle width direction (horizontal direction in the drawing) is provided on the rear surface (bottom surface) of the tail panel 15 on the rear end rear surface (lower surface) of the floor surface portion 11. The bracket 141d is mounted on the bracket and the guide plate 141c, and the hook 141d is vertically rotatable with respect to the hinge pin.

As described above, the tail panel 15 is hung vertically from the floor surface portion 11 at the rear end of the floor surface portion 11, and is provided with the opening portion 15a corresponding to the lower hinge shaft 141b at the illustrated position. The guide plate 141c and the hook 141d are projected to the vehicle rear side through the opening 15a.

The hook 141d constitutes an automatic opening/closing device that opens and closes as the luggage box 1 tilts rearward of the vehicle (see FIG. 1). In this automatic opening/closing device, as shown in the side view of FIG. 2B, one end of the connecting rod 161 is connected to the base end of the hook 141d, and the other end of the connecting rod 161 is connected to the substantially L-shaped arm member 162. The arm member 162 is supported by the shaft supporting portion 163 so as to come into contact with the guide portion 164 fixed to the vehicle body frame 2. The connecting rod 161 is provided with a buffer portion 165 having a built-in spring at a portion near the arm member 162. Further, a spring 167 is stretched between a portion of the connecting rod 161 near the hook 141d and a bracket 166 provided on the rear end rear surface side of the floor surface portion 11. The bracket 166 is provided with the above-mentioned hinge pin serving as a rotation axis of the hook 141d. The connecting rod 161 is pulled toward the rear of the vehicle via the spring 167. That is, the hook 141d is biased by the spring 167 in the direction away from the lower hinge shaft 141b. Therefore, when the luggage box 1 tilts rearward of the vehicle, the arm member 162 swings from the state shown in the figure toward the vehicle rearward side around the shaft support portion 163, and the hook 141d moves away from the lower hinge shaft 141b. The securing of the shaft 141b is released. On the other hand, when the luggage box is in the horizontal state as illustrated, the arm member 163 swings toward the vehicle front side, and the connecting rod 161 is pulled toward the vehicle front side against the biasing force of the spring 167. As a result, the hook 141d is firmly fixed to the lower hinge shaft 141b from above.

Then, when the lower hinge shaft 141b is fastened by the hook 141d, the tailgate 14 releases the upper hinge shaft 1402 from the lower hinge shaft 141b by releasing the fastening to the upper hinge shaft 1402. It can be rotated up and down around the center. When the tailgate 14 is rotated downward (upward opening operation) along the illustrated arrow A3, the rear of the luggage box 1 is opened, and when closing the opened state, the tailgate 14 is rotated upward along the arrow A3. Then, the released lashing is performed again on the upper hinge shaft 1402. Both up and down rotation along these arrows A3 are directly performed by a manual operation of the operator. In addition, as described above, the turning operation of the tailgate 14 along the arrow A3 is performed during the fastening state by the hatched hook 141d, while the downward opening operation (the state indicated by the alternate long and short dash line in FIG. 1). Is performed when the hook 141d is opened and the fastening is released (the hook 141d is rotated counterclockwise from the illustrated state).
Next, the biasing member 142 will be described with reference to FIG.

The urging member 142 includes a spring portion 1422 wound around a shaft 1421 having a longitudinal direction in the vehicle width direction (left-right direction in the drawing), and a bottom end portion of the tailgate 14 that is fixed to the tailgate 14 so as to open upward. It has a rotating portion 1423 that can be rotated up and down in accordance with the operation and the downward opening operation, and an opening portion 1424 formed by cutting out the tail panel 15 so as to face the rotating portion 1423 when viewed from the vehicle rear side. .. The shaft 1421 is provided so that its axial direction is the same as the axial direction of the lower hinge shaft 141b of the lower hinge 141 described above.

Each end of the shaft 1421 is engaged with the tail panel 15. First, the right end portion is engaged with the inner surface of the rectangular tubular portion 1425a fixed to the tail panel 15 via the bolt 1425a and the nut in a fitted state. Next, the left end is engaged by a stopper plate 1426 fixed to the tail panel 15 by welding. The stopper plate 1426 is provided with a through hole having substantially the same diameter as the outer diameter of the shaft 1421 at substantially the center. The right end of the shaft 1421 is inserted into the rectangular tubular portion 1425a in a fitted state, and the left end of the shaft 1421 is welded to the stopper plate 1426 with the through hole penetrated. In the present embodiment, the right end of the shaft 1421 is engaged with the tail panel 15 in a fitted state and the left end is welded and fixed, but the right end is welded and fixed on the left side. The end portions may be engaged with each other in a fitted state, or both end portions may be fixed by welding.

In the spring portion 1422, the right end portion 1422a extends slightly outside the winding portion of the spring portion 1422 in the state shown in the figure, and the left end portion 1422b extends larger than the winding portion. It is provided in the state of being put out. In the present embodiment, the left end portion 1422b has a shape extending by approximately twice the outer diameter of the winding, as illustrated.

In the present embodiment, the right end 1422a is located adjacent to the rectangular tubular portion 1425, and a block-shaped guide stopper 1427 is provided adjacent to the left end 1422a. The guide stopper 1427 is fixed to the tail panel 15 by welding, and the right end portion 1422a is sandwiched between the rectangular tubular portion 1425 and the guide stopper 1427. Movement is regulated. Further, a cover portion 1428 having the longitudinal direction in the vehicle width direction is fixed to the tail panel 15 via bolts 1428a and nuts. The cover portion 1428 has a convex portion at a central portion sandwiched between the upper portion and the lower portion by bending the upper portion and the lower portion of one metal plate, and the upper portion and the lower portion are respectively above and below the convex portion. It has an overhanging part that is overhanging to the side. The cover portion 1428 is fixed to the tail panel 15 by fastening the protruding portion via the bolt 1428a and the nut described above. In this fixed state, the end portion 1422a of the spring portion 1422 is sandwiched by the tail panel 15 and the cover portion 1428 in the vehicle front-rear direction, and movement (rotation) of the shaft 1421 in the circumferential direction is also restricted. Therefore, the right end portion 1422a of the spring portion 1422 is fixed to the tail panel 15.

The rotating portion 1423 includes a first rotating portion 1423a made of a bracket material having an L-shaped cross section and having a vertical direction (vertical direction in the drawing) as a longitudinal direction when the tailgate 14 is in an upright state, and the first rotating portion 1423a. And a second rotating portion 1423b formed of a bracket material having an L-shaped cross section whose longitudinal direction is the vertical direction when the tailgate 14 is in the upright state. The first rotating portion 1423a is provided adjacent to the spring portion 1422 in the vehicle front-rear direction, and the second rotating portion 1423b is provided adjacent to the tail panel 15 at a position above the shaft 1421. ing. That is, the second rotating portion 1423b is provided such that the length in the longitudinal direction is shorter than the length in the longitudinal direction of the first rotating portion 1423a. When the illustrated tailgate 14 is in the upright state, the first rotating portion 1423a is in contact with the left end portion 1422b of the spring portion 1422.

The opening 1424 is a portion that is cut out in a substantially rectangular shape having the vertical direction as the longitudinal direction, and is provided so as to face the first rotating portion 1423a as illustrated. Specifically, the opening portion 1424 is arranged such that the first rotating portion 1423a is included in the opening region in the vehicle width direction, and further in the vertical direction, the lower end portion of the first rotating portion 1423a and the spring portion. Any of the left end portion 1422b of 1422 is provided so as to be included in the opening region.

Regarding the fixing of the biasing member 142 to the tail panel 15, as shown in FIG. 3B, the shaft 1421 and the spring portion 1422 are placed at predetermined positions with respect to the tail panel 15. From this state, the rectangular tubular portion 1425 is fitted to the shaft 1422 and fixed to the tail panel 15. Next, the cover portion 1428 is fixed to the tail panel 15 so as to cover the shaft 1421, the spring portion 1422, and the rectangular tubular portion 1425. When the shaft 1421 is placed at a predetermined position, it can be fixed to the stopper plate 1426 by welding, but as described above, the tail panel 15 of the shaft 1421 is fixed. Can be changed as appropriate.

In the luggage box 1 having such a configuration, the function of the biasing member 142 when the tailgate 14 is opened upward will be described with reference to FIG. 3C viewed from the left side of FIG. 3A. Note that, for convenience of description, the stopper plate 1426 and the second rotating portion 1423b are not shown in the drawing.

The opening area in the opening 1424 described above is an area indicated by an arrow S in the vertical direction as shown in FIG. When the tailgate 14 shown in the drawing is opened upward, the first rotating portion 1423a is similarly rotated along with the rotating operation of the tailgate 14. At this time, the first rotating portion 1423a rotates downward (clockwise in the figure) about the shaft 1421 having the same shaft center as the lower hinge shaft 141b of the lower hinge 141. With the rotation operation, the end 1422b of the spring portion 1422 in the contact state with the first rotating portion 1423a is also strongly pressed in the clockwise direction, and the first rotating portion 1423a and the end portion 1422b of the spring portion 1422 are engaged with each other. It becomes a state. At this time, as described above, since the spring portion 1422 is fixed to the tail panel 15 by the rectangular tubular portion 1425, the guide stopper 1427, and the cover portion 1428, the spring portion 1422 has the first rotating portion 1423a. A biasing force that pushes back counterclockwise is generated. In other words, when the operator manually lifts the upwardly opened tailgate 14 and sets it in the standing state, a biasing force that can reduce the load required for the rotating operation is generated. Further, since the end portion 1422b is largely extended, a large biasing force can be obtained even if the pressing force of the first rotating portion 1423a is relatively small. Since the opening 1424 has the illustrated area S, the extending end 1422 and the first rotating portion 1423a pass through the area S even when the tailgate 14 is rotated along with the upward opening operation. Therefore, the interference with the tail panel 15 can be prevented.

In the urging member 142 according to the present embodiment, the spring portion 1422 that generates the urging force is fixed to the tail panel 15, but the end portion 1422b is pressed (engaged) and attached to the spring portion 1422. The first rotating portion 1423b for generating a force is fixed to the tailgate 14 and is configured to be pressed only when the tailgate 14 is opened upward. That is, the first rotating portion 1423a functions as an engaging portion that engages with the end portion 1422b of the spring portion 1422 when the tailgate 14 is operated to open upward, and generates an urging force on the spring portion 1422. When the urging force is generated, the effect is great in that the upward opening is completed and the state is hung downward substantially vertically and the load of the work of lifting the tailgate 14 having a weight of 50 to 70 kg to the standing state is reduced. On the other hand, when the tailgate 14 is in the upright state, the first rotating portion 1423a only comes into contact with the end portion 1422b from the vehicle rear side, and the spring portion 1422 is not biased. Furthermore, when the tailgate 14 is opened downward, only the first rotating portion 1423a rotates in the direction in which the first rotating portion 1423a separates from the tail panel 15 in the contact state, so that the first rotating portion 1423a causes the spring portion 1422 to move. The non-engaged state (non-pressed state) with respect to the end portion 1422b of the. Therefore, the first rotating portion 1423a that functions as the engaging portion according to the present embodiment simply attaches to the end portion 1422b of the spring portion 1422 by the upward opening operation or the downward opening operation of the tailgate 14. It is possible to switch between an engaged state in which the force can be generated and a non-engaged state in which the force is not generated. The operator only has to perform the upward opening operation of the tailgate 14 or the closing operation thereof (the operation of returning to the standing state) in order to bring it into the engaged state or the disengaged state, so that the work is prevented from being complicated. it can. In addition, in the present embodiment, the spring portion 1422 is provided on the shaft 1421 in a state where the left end portion 1422b of the spring portion 1422 is greatly extended, but this state can be appropriately changed. For example, even when the above-mentioned end portions 1422a and 1422b are inverted to the opposite positions, the first rotating portion 1423a can press the opposite end portion of the spring portion 1422 with the upward opening operation of the tailgate 14. In that case, the same effect can be obtained. In this case, it is preferable that the greatly extended end portion is the right end portion and that the extended portion is provided with a through hole that can penetrate the tail panel 15. By making the through hole penetrate, it is possible to restrict the movement of the spring portion 1422, and it is possible to omit the guide stopper 1427 described above. Of course, as the configuration using the guide stopper 1427, the spring portion 1422 in which both ends do not extend greatly may be adopted.

In the present embodiment, the state in which the first rotating portion 1423a is separated from the end portion 1422b of the spring portion 1422 has been described as the non-engagement state, but the state in which the tailgate 14 is only in the upright state and abutting is also possible. It may be in a non-engaged state. Even when the tailgate 14 is in the upright state and the first rotating portion 1423a is pressing the end 1422b, when the tailgate 14 is opened upward from the pressed state, the spring portion 1422 is further pressed. It can be applied in the same way as the generated biasing force increases. In addition, when the tailgate 14 is in the upright state, the first rotating portion 1423a is adjacent to the end portion 1422b of the spring portion 1422 (away from the end portion), and the upward opening operation of the tailgate 14 is started to rotate. It may be configured so as to be abutted and pressed during movement. That is, when the structure is such that when the tailgate 14 is operated to open upward, a biasing force that reduces the load required when the operator lifts the tailgate 14 is generated, the first rotating portion 1423a in the upright state is spring-loaded. It can be applied because the same effect can be obtained regardless of the relative relationship between the end 1422b of the portion 1422.

In the disengaged state, not only when the above-described downward opening operation is performed, but also when the upper opened tailgate 14 is returned to the standing state (lifted) at an intermediate position, the first rotating portion 1423a causes the spring to move. The part 1422 may be separated from the end 1422b, and the state of reaching the intermediate position may be the non-engaged state. What is desired according to various conditions such as the size and type of the vehicle DT or the luggage box 1 or the weight of the luggage box 1 or the tailgate 14, that is, the position (posture) in the disengaged state can be set and changed as appropriate. Can be
In the case of a vehicle having a dump function like the vehicle DT according to the present embodiment, these effects also have a synergistic effect in the following points.

The tailgate 14 is capable of both of the above operations by the lower hinge 141, but the lower hinge 141 is configured to be connected to the connecting rod 161 (see FIG. 2B). At the time of opening, the hook 141d of the lower hinge 141 is also pressed by the pulling force of the connecting rod 161 or the like to firmly press the lower hinge shaft 141b, and it is necessary to lift the tailgate 14 against the pressing force. .. Therefore, not only the load of lifting work based on the weight of the tailgate 14 described above, but also the effect of the biasing force of the spring portion 1422 is remarkable in terms of reducing the load against such pressing force.

Next, a second embodiment different from the above embodiment will be described with reference to FIG. It should be noted that the description will be focused on the portions different from the first embodiment, and the same members will be described using the same reference numerals.

The second embodiment is a luggage box 1 mounted on a freight vehicle SDT shown in the side views of FIGS. 4(a) and 4(b). FIG. 4(a) shows a state in which the freight vehicle SDT can travel, and FIG. 4(b) shows a state in which the luggage box 1 is slid to the vehicle rear side (right side in the figure) and then inclined and grounded. ing. In this grounded state, a construction machine (not shown) can be loaded into the luggage box 1. As shown in FIG. 4(b), the freight vehicle SDT uses the lift cylinder (not shown) to tilt the luggage box 1 backward from the state shown in FIG. 4(a) in addition to the state in which the luggage box 1 is grounded. It can also be in a (dumped) state (for example, JP 2011-230653 A).

The vehicle body frame 2 includes a vehicle frame 21 and a tilting frame 22 that can tilt with respect to the vehicle frame 21. Like the vehicle frame 21, the tilting frame 22 has a longitudinal direction in the vehicle front-rear direction, and is tiltable with respect to the rear portion of the vehicle frame 21 via a dump hinge 2a serving as a first tilting shaft. When the freight vehicle SDT in a state where the packing box 1 is loaded with earth and sand and the like is discharged to the rear of the vehicle, the dump hinge 2a is utilized by utilizing the extension of a lift cylinder (not shown) connected to the vehicle frame 21. The luggage box 1 is tilted to the rear side of the vehicle around the. With the tilting of the packing box 1, the tailgate 14 opens downward (counterclockwise in the figure) around the upper hinge 140, and the earth and sand are discharged. At this time, the tilting frame 22 tilts similarly to the luggage box 1.

In the freight vehicle SDT, the tilting frame 22 is fixed to the vehicle frame 21 via the hook 22a when the luggage box 1 is in the grounded state as shown in FIG. 4B. At this time, the luggage box 1 is grounded as illustrated as the slide cylinder SC provided between the tilting frame 22 and the luggage box 1 is extended.

Here, the tilting frame 22 is as shown in FIG. 5, and the slide cylinder SC is fixed to the rear part of the tilting frame 22. Note that, in FIG. 5, for convenience of description, the slide cylinder SC can be installed, and a portion necessary for bringing the luggage box 1 into a grounded state is mainly shown.

As shown in FIG. 5, the tilting frame 22 includes a pair of base frames 22B in the left-right direction (X-axis direction) whose longitudinal direction is the vehicle front-rear direction, and the vehicle front side (Y-axis positive direction side) between the left and right base frames 22B. ) And the cross frames 22C1 and 22C2 provided on the vehicle rear side (Y-axis negative direction side), and a guide frame 22G fixed to these cross frames 22C1 and 22C2 and having the vehicle longitudinal direction as the longitudinal direction. The cross frame 22C2 on the vehicle rear side extends to the outside in the vehicle left-right direction (X-axis direction) with respect to the base frame 22B, and the extended tip portion is connected to the vehicle frame 21 via the dump hinge 2a. There is.
Each of the base frames 22B is in a state of being loaded on the vehicle frame 21.

The guide frame 22G is connected to the cross frame 22C1 on the front side of the vehicle and has a front frame portion 22G1 having a shape that extends horizontally (in the Y-axis direction) and a shape that extends obliquely upward from the front frame portion 22G1 toward the rear. And a rear frame portion 22G3 having a shape horizontally extending rearward from the inclined frame portion 22G2. The left and right guide frames 22G have a substantially U-shaped cross section in which the inner sides facing each other are open, and the inner spaces of the front frame portion 22G1, the inclined frame portion 22G2, and the rear frame portion 22G3 all communicate with each other. ing. The guide frame 22G has a configuration in which the inclined frame portion 22G2 is located at a position higher than the base frame 22B from an intermediate portion in the longitudinal direction (Y-axis direction).

The luggage box 1 provided above the tilting frame 22 is provided with a luggage box frame 11F which supports the floor surface portion thereof and has the longitudinal direction in the vehicle front-rear direction. In FIG. 5B, the luggage box frame 11F is shown by a dashed-dotted phantom line, and in the tilting frame 22, the front end portion 3310 of the front frame portion 22G1 is disposed in the vehicle longitudinal direction (Y-axis direction). The frame 11F is provided so as to be substantially vertically aligned at substantially the same position as the tip 110F.

As shown in FIG. 6, a leg portion 51 is fixed to a front side of the floor surface portion F of the vehicle in the luggage box 1 mounted on the tilting frame 22, and a leg roller provided on the leg portion 51. 511 can be rolled in its inner space while being guided by the guide frame 22G. The floor surface portion F of the luggage box 1 is connected to the rod portion of the slide cylinder SC via a fixing bracket (not shown) fixed to the lower surface thereof. When the slide cylinder SC extends, the leg rollers 511 roll within the guide frame 22G, and the luggage box 1 also slides toward the vehicle rear side (Y-axis negative direction side) in accordance with the rolling.

At the rear end of the guide frame 22G, an arm plate 53 having a substantially L-shaped cross section can be tilted about a vehicle width direction (X axis direction) as an axial direction via an inclined hinge shaft 52 that is inserted through the insertion hole 22Gb. It is provided. That is, the arm plate 53 is tiltable with respect to the guide frame 22G while being supported by the tilted hinge shaft 52 as the second tilting shaft. Two arm rollers 531 and 532 are provided on the outer side surfaces of the respective arm plates 53 so as to roll in the above-mentioned luggage box frame 11F supporting the floor surface portion F with the vehicle width direction as the axial direction. There is. The pair of left and right packing box frames 11F has a substantially U-shaped cross section with the opposite sides open.

Therefore, when the slide cylinder SC extends, the leg rollers 511 roll inside the guide frame 22G, and the luggage box 1 and the luggage box frame 11F move with the movement thereof. The leg roller 511 moves sequentially through the front frame portion 22G1, the inclined frame portion 22G2, and the rear frame portion 22G3, and further moves to the vicinity of the inclined hinge shaft 52. In accordance with the rolling, the luggage box 1 moves with its front side standing up and inclined. The leg roller 511 rolls along the shape of the guide frame 22G with the extension of the slide cylinder SC, and the leg 51 also moves with the rolling. Due to the movement of the legs 51, the luggage box 1 is slid to the rear of the vehicle, and is then largely inclined and grounded (see FIG. 4B). When the packing box 1 is tilted, the arm plate 53 tilts about the second tilting shaft (the tilted hinge shaft 52 inserted into the insertion hole 22Gb), so that the arm roller 531 can move the packing box frame 11F well. In order to bring the grounded cargo box 1 into a state in which the freight vehicle SDT can travel (see FIG. 4A), the slide cylinder SC is contracted to lift the cargo box 1 to the front side of the vehicle. To slide.

When the luggage box 1 is slid to the rear side of the vehicle to be in a grounded state and the tailgate 14 is also opened upward to be in a grounded state, it is possible to load and unload construction machinery and the like. The freight vehicle SDT according to the present embodiment is also provided with the urging member 142 similar to the first embodiment, and the tailgate 14 in the grounded state can be easily closed (pulled up) while the luggage box 1 is in the grounded state. Is possible.

In the case of the luggage box 1 according to the present embodiment, as shown in FIG. 4B, the tailgate 14 that is opened upward is in contact with the ground, and thus is at a lower position than in the case of the first embodiment. Therefore, it is necessary for the operator to lift the tailgate 14 in a bent state, so that the urging force of the urging member 14 of the present invention greatly reduces the load required for the lifting.

In addition, in the present embodiment, the tailgate 14 is often opened downward when discharging the loaded earth and sand using the dump function, and the tailgate 14 is often opened upward when unloading the construction machine. In this case, although it is often used properly according to the purpose, even in such a case, the operator can appropriately use both the upward opening operation and the downward opening operation of the tailgate 14 without operating the biasing member 142. It is useful without complexity.

As described above, in any of the above-described embodiments, the required urging force can be set as appropriate, and the position where the urging force is generated and the position where the urging force is eliminated can be adjusted by rotating the tailgate 14 (upward opening operation, downward opening operation). It can be appropriately set by the opening operation and the operation of lifting the upwardly opened tailgate).

INDUSTRIAL APPLICABILITY The present invention is useful for all packing boxes having a door that can be opened and closed.

DT Vehicle 1 Packing box 2 Body frame 3 Dump device 11, F Floor surface part 12 Front panel 13 Side gate 14 Tailgate 15 Tail panel 141 Lower hinge 142 Biasing member 1421, Shaft 1422 Spring part 1422a Spring part end 1422b Spring part end (Extended part)
1423 rotating part 1423a first rotating part (engagement part)
1423b 2nd rotation part 1424 opening part

Claims (4)

A loading box mounted on a vehicle having a tailgate that can be tilted by a dump device provided on a vehicle body frame and that can be opened upward and downward from a state of standing upright with respect to a floor portion,
An urging force is generated between the tail panel vertically installed to the rear end of the floor surface portion and the tail gate by the upward opening operation of the tail gate in the direction in which the tail gate rotates upward. The bias member is fixed,
The urging member is engaged with the urging member so as to generate the urging force, and the urging member is urged by a downward opening operation or an operation in which the upwardly opened tailgate is rotated upward to a desired posture. A luggage box mounted on a vehicle, wherein an engaging portion that is in a non-engagement state with a member is provided in the tailgate. The urging member has a shaft fixed to the tail panel and having a vehicle width direction as a longitudinal direction, and a spring portion wound around the shaft,
The spring portion is provided with an extending portion extending in a direction intersecting the winding axis,
The luggage box mounted on the vehicle according to claim 1, wherein the extension portion is pushed by the engagement portion to be brought into the engagement state. The spring portion is provided adjacent to the surface of the tail panel,
The engaging portion is provided in a state where the tailgate is in contact with or adjacent to the extending portion in the upright state,
Further, the tail panel is provided with an opening formed by cutting out a region facing the extending portion. The luggage box mounted on the vehicle according to claim 2, wherein the opening is formed. The body frame is a pair of left and right vehicle frames whose longitudinal direction is the vehicle front-rear direction,
A tilting frame provided to be tiltable with respect to the vehicle frame,
A slide cylinder provided on the tilting frame,
The luggage box mounted on the vehicle according to any one of claims 1 to 3, wherein the rear end is brought into a substantially grounded state by extension of the slide cylinder.

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