JP5881245B2 - Bumper for dump vehicle - Google Patents

Description

  The present invention relates to a bumper provided in a dump vehicle.

  The dump vehicle tilts a cargo box mounted on a vehicle frame or the like backward using a hydraulic cylinder, and discharges earth and sand, waste, and the like housed in the cargo box. In this case, the bumper and the like at the rear of the vehicle are close to the location where the discharged matter is accumulated, and may be affected by dumping. Therefore, various improvements have been made to the configuration of the bumper and its peripheral members in order to improve the work efficiency of dump discharge.

  For example, when an asphalt finisher device is used in asphalt pavement construction, a configuration using a bumper whose position can be changed is known (Patent Document 1). The apparatus is used integrally with the dump vehicle, and advances by pushing the dump vehicle from behind, and advances the paving work while receiving asphalt replenishment from the dump car's packing box. The discharged asphalt is housed in the hopper of the above device, but in order to prevent the bumper and hopper from interfering with each other, the bumper stay is attached to the vehicle frame of the dump vehicle so as to be able to turn up and down, and the bumper is flipped forward together with the bumper stay. ing.

  Similarly, in order to prevent interference with the hopper of the asphalt finisher device, a configuration is also known in which the bumper stay is rotated backward and lifted (Patent Documents 2 and 3).

  With these techniques, the bumper can be fixed at a predetermined position when the vehicle is traveling, and can prevent interference with an obstacle entering under the cargo box such as the hopper when the dump is discharged.

Japanese Patent No. 3315514 JP 2010-228520 A JP 2011-031862 A

  However, there is still room for improvement in terms of improving dump discharge performance simply by avoiding interference between the bumper and the obstacle.

  First, when the bumper is rotated forward of the vehicle, the manual operation needs to be performed under the cargo box, which is very difficult. Therefore, in practice, a driving device such as a cylinder is essential, which causes a large cost increase.

  Second, the bumper may be buried in the accumulated waste during dump discharge, or it may interfere with the accumulated waste when the vehicle is moved backward for dump dump again. Therefore, if the bumper is rotated upward as much as possible in order to avoid such interference with the discharged material, the rear end portion of the cargo box descends at the time of dump discharge, so there is a high possibility of interference with the bumper rotated upward. Become.

  Third, we want to move the discharge location to the rear of the vehicle as much as possible. In the case of a dump vehicle that carries general wastes, dumping is generally performed at a waste collection site. At the place where dumping is discharged, there is a wheel stop that stops the reverse of the vehicle, and there is a certain distance between the wheel stop and the place where the waste is accumulated, and the type and size of the dump vehicle are limited . Therefore, it is preferable that the application types of the dump vehicle can be expanded, and it is desired to increase the horizontal distance from the rear wheel to the rear end of the cargo box and move the discharge position backward. However, even if only the rearward movement of the discharge position is realized, the gravity center position of the cargo box moves to the vehicle rear side. The packing box is tilted backward and downward due to the extension of the hydraulic cylinder, and the hydraulic cylinder is contracted by the weight of the packing box and the like, and returns to the horizontal state. For this reason, when the gravity center position moves to the vehicle rear side, the time until the packing box returns to the horizontal state becomes longer.

  The present invention has been made in view of these points, and has a simple configuration and can contribute to improvement of dump discharge performance while avoiding interference with obstacles below the packing box. The purpose is to provide.

  In the present invention, the above-described problems can be solved by using the following means.

  A dumper bumper mounted on the bumper stay is supported by a bumper stay pivotally supported at the rear of the vehicle frame at a rear portion of the vehicle frame so as to be tiltable with respect to the vehicle frame extending in the front-rear direction. The bumper stay is provided with a turning piece whose turning center is a pivotal support portion with the vehicle frame, and the turning piece is connected to connecting means having one end connected to the packing box. The relative position between the rotating piece and the one end in the state where the bumper stay is rotated upward is held.

  The connecting means is a plate member extending substantially in one direction, one end of the connecting means is pivotally supported by the cargo box, and the rotating piece is slidable on the other end of the connecting means. The structure connected to is preferable.

  The other end of the connecting means and the rotating piece are connected by inserting an engaging pin, and the engaging pin slides on the connecting means. More preferably, it is a lashing member that restricts sliding of the engaging pin.

  As in the present invention, the bumper stay is configured to be pivotable up and down with respect to the vehicle frame, so that the bumper can avoid interference with an obstacle below the cargo box. In addition, since the rotating piece provided on the bumper stay is connected to the packing box by the connecting means and the relative position is maintained, the rotating piece also rotates when the packing box tilts. Therefore, the bumper stay and the bumper also rotate downward with the tilting operation of the packing box, and the packing box does not interfere with the bumper.

These configurations are realized by connecting the rotating piece to the cargo box by the connecting member, and can be realized by a simple configuration to suppress an increase in cost. Furthermore, the vehicle can be moved backward in a state where an obstacle is avoided, and the cargo box can be placed on the rear side of the vehicle rather than the state where the bumper is not rotated.

It is a side view of the bumper for dump vehicles concerning the embodiment of the present invention. It is a side view which shows the dump discharge operation | movement of the dump vehicle which concerns on embodiment of this invention. It is a side view showing dumping discharge operation in the state where a dump vehicle concerning an embodiment of the present invention does not raise a bumper.

  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 rear portion of a dump vehicle 100 that tilts the cargo box 1 downward and rearward. The dump vehicle 100 includes a cargo box 1, a vehicle frame 2 on which the cargo box 1 is mounted, a bumper stay 3 connected to the rear portion of the vehicle frame 2, and a bumper 4 attached to the tip of the bumper staple 3. Yes.

  The cargo box 1 is formed of a floor portion and a awning erected on its four sides. One end of a lift device 5 having a hydraulic cylinder is connected to the lower portion of the cargo box 1. The other end of the lift device 5 is connected to the vehicle body frame 2. When the hydraulic cylinder extends, the cargo box 1 tilts backward with respect to the vehicle body frame 2 as indicated by a one-dot chain line. The upper side of the gates 11 and 12 of the rear door (tailgate) 11 on the vehicle rear side is connected to the side door (side gate) 12 on the side of the vehicle via a connecting portion (not shown). . The tailgate 11 pivots so that the lower end of the tailgate 11 is detachable as the cargo box 1 tilts (downward opening operation) with the connecting portion as the center. When the packing box 1 is tilted, the stored items such as earth and sand and waste stored in the packing box 1 are discharged outward (dump discharge) from the opening with the tailgate 11 opened downward.

  The vehicle frame 2 includes a chassis frame 21 that extends in the vehicle front-rear direction, and a sub-frame 22 that is loaded and welded to the frame 21. A hinge portion 6 is provided at the rear portion of the subframe 22, and the cargo box 1 is mounted via the hinge portion 6 so that the tilting can be performed.

  The bumper stay 3 and the bumper 4 can be rotated counterclockwise from the illustrated state. The bumper stay 3 is provided at the rear end of the chassis frame 21. As shown in the figure, the bumper stay 3 has a substantially “<” shape, is pivotally supported by the intermediate portion 31, and is rotatable in the vertical direction with respect to the chassis frame 21. A bumper 4 having a longitudinal direction in the vehicle width direction is fixed to the lower end side portion 32 shown in the figure. The upper end portion 33 shown in the figure is a piece of the bumper stay 3 that rotates up and down around the shaft support portion 31a in the intermediate portion 31, and is simply referred to as a “rotation piece” below.

  When the cargo box 1 is in a horizontal state, the rotating piece 33 is in a state of protruding rearward from the rear end portion of the chassis frame 21 as shown in the figure. In the vicinity of the rotating piece 33, the connecting arm 7 is disposed at a position on the inner side of the vehicle. The connecting arm 7 is a plate member that extends in one direction and serves as a connecting means between the packing box 1 and the rotating piece 33, and is connected to the floor 13 of the packing box 1 at one end and rotated at the other end. It is connected to the piece 33. On the other end side of the connecting arm 7, a long hole 71 is provided along the longitudinal direction. A first pin 7 a that engages the connecting arm 7 and the rotating piece 33 is inserted through the long hole 71. The first pin 7 a is slidable through the long hole 71, and the sliding of the first pin 7 a is guided by the long hole 71. A second pin 7b for connecting the floor portion 13 and the connecting arm 7 is inserted on one end portion side of the connecting arm 7, and the connecting arm 7 is connected to the floor portion 13 from the illustrated state by the second pin 7b. It can turn to the front side of the vehicle.

  The dump discharge of the dump vehicle 100 is as shown in FIG. FIG. 2 shows a dump vehicle 100 in the waste accumulation field 8, which includes a traveling portion 81 of the dump vehicle 100, a wheel stopper 82 of the dump vehicle 100, and a waste accumulation unit. 83 is provided.

  In FIG. 2A, the dump vehicle 100 is stopped in a travelable state. At this time, the ground height H1 of the bumper 4 is lower than the height H2 of the wheel stopper 82. When the dump vehicle 100 moves backward (moves in the right direction in the figure) and dumps the contents of the cargo box 1 into the stacking unit 83, the operator manually holds the bumper 4 and rotates counterclockwise (in the direction of arrow A1). Turn to. When the bumper 4 is lifted, the bumper stay 3 is in a lying state as indicated by the one-dot chain line in the enlarged view. At this time, the rotating piece 33 moves from the solid line portion to the front side of the vehicle counterclockwise like the one-dot chain line portion. By the movement of the rotating piece 33, the connecting arm 7 rotates clockwise from the solid line portion to the one-dot chain line portion around the second pin 7b, and at the same time, the first pin 7a moves the elongated hole 71 from the lower side to the upper side. Move towards. A butterfly screw (not shown) is attached to the first pin 7a, and is fixed so that the first pin 7a cannot move in the long hole 7a by manually tightening the butterfly screw when it moves upward. Be bound. Since the rotation piece 33 cannot be moved by the first pin 7a being secured, the bumper 4 is held in a state of being rotated upward (one-dot chain line portion). The butterfly screw is a holding means for restricting the sliding of the first pin 7a and holding the relative position between the first pin 7a and the second pin 7b. A configuration using a lashing member or a configuration in which a separate engagement pin or the like is inserted into the long hole 71 to restrict sliding of the first pin 7a may be used.

  When the bumper 4 is rotated upward and the distance between the first pin 7a and the second pin 7b is maintained at the size L1, the dump vehicle 100 is moved backward as shown in FIG. At this time, the ground height H3 of the bumper 4 is set higher than the height H2 of the wheel stopper 82. Even if the dump vehicle 100 is moved backward to a position where the rear wheel RT is in contact with or close to the wheel stopper 82, the bumper 4 4 can move further backward than the wheel stopper 82 without interfering with the wheel stopper 82.

  After the dump vehicle 100 moves backward and the rear wheel RT comes close to the wheel stopper 82, the dump is discharged as shown in FIG. The tailgate 11 is opened downward by the tilt of the packing box 1, and the discharge 9 is accumulated in the accumulation portion 83. When the cargo box 1 tilts, the second pin 7 b is also rotated clockwise around the hinge portion 6. Since the first pin 7a is held by the butterfly screw while maintaining the distance L1 relative to the second pin 7b, the first pin 7a is rotated clockwise together with the second pin 7b. Since the rotation piece 33 is also rotated clockwise by the rotation of the first pin 7a, the bumper stay 3 and the bumper 4 are also rotated clockwise. That is, as the packing box 1 tilts, the bumper 4 once lifted upward also rotates downward.

  As a result, the bumper 4 does not interfere with the tilting packing box 1. Further, since the dump vehicle 100 is moved backward while the bumper 4 is lifted (FIG. 2B), the bumper 4 has moved further beyond the wheel stopper 82, and the bumper 4 is moved forward of the wheel stopper 82. Compared to the state located at, the dump discharge location can be moved rearward. Further, it is not necessary to set an unnecessarily large length (rear overhang) from the rear wheel RT to the vehicle rear end. Therefore, since the center of gravity position when the packing box 1 is tilted does not move to the vehicle rear side, the time for the packing box to return to its horizontal state from the tilting state does not increase. Furthermore, since the gravity center position of the packing box 1 does not change, stable dump discharge can be performed.

  After dumping, the packing box 1 returns from the tilted state to the horizontal state by its own weight. At this time, the bumper 4 is also rotated (raised) in the same manner as the cargo box 1 is rotated counterclockwise. Since the bumper 4 returns to the state of the height H3 again, the bumper 4 can be moved forward without interfering with the wheel stopper 82 when the dump vehicle 100 is advanced. That is, FIG. 2B is changed from the state of FIG. Thereafter, the bumper 4 in a state where the bumper 4 is lifted up is rotated downward to make the vehicle travelable (FIG. 2A).

  Next, the dump vehicle 100 according to the present embodiment can also perform the dump discharge in a state where the bumper 4 is not lifted (a vehicle travelable state) when there is no obstacle or the like below the cargo box. In this case, the state shown in FIG. 3 is obtained.

  In the vehicle travelable state, the bumper stay 3 and the bumper 4 are fixed to the chassis frame 21 in the illustrated posture. The fixing in the state shown in the figure is performed by a third pin 7 c inserted in the vehicle width direction with respect to the bumper stay 3. The chassis frame 21 is provided with a bracket (not shown) extending downward at the rear end thereof so as to face the illustrated bumper stay 3. The bumper stay 3 and the bracket are provided with holes through which the third pin 7c is inserted, and the bumper stay 3 is fixed to the chassis frame 21 by inserting the third pin 7c into these holes. It becomes a state.

  At this time, since the first pin 7a is not locked by the butterfly screw, when the cargo box 1 is tilted, the first pin 7a slides through the long hole 71 of the connecting arm 7 and moves upward. That is, since the relative position between the first pin 7a and the second pin 7b is not maintained, the position of the bumper 4 does not change even when the cargo box 1 is tilted. Even if the position of the bumper 4 does not fluctuate, the bumper 4 is not lifted up before dumping, so that it does not interfere with the tilting cargo box 1.

  As described above, the bumper 4 provided in the dump vehicle 100 according to the present embodiment can appropriately select a state in which the bumper 4 rotates as the cargo box 1 tilts and a state in which the bumper 4 does not rotate depending on the situation required for dump discharge. However, any configuration that can be similarly selected can be applied to the following embodiments.

  In this embodiment, the connecting arm 7 is provided with the long hole 71 to serve as the guide portion of the first pin 7a. However, the shape is not limited to the shape extending in one direction, but the shape is adapted to the locus of the rotating piece 33. A portion may be provided on the connecting arm 7.

  In addition, using the configuration in which the first pin 7a slides through the long hole 71, the bumper stay 3 can be changed to a plurality of postures in each state of FIG. 2, but if the bumper stay 3 can be changed to a plurality of postures. A configuration provided with connecting means other than this configuration may also be used. For example, the structure which combined the short arm shorter than the said connection arm 7 and a spring member may be sufficient. In this case, one end of the short arm is rotatably connected to the floor 13 of the cargo box 1 by the second pin 7b. One end of the spring member is connected to the rotating piece 33 and the other end is connected to the short arm so as to bias the rotating piece 33 upward. With this configuration, the bumper 4 can be lifted upward from the vehicle travelable state against the biasing force of the spring member. Furthermore, the posture of the bumper stay 3 or the bumper 4 can be secured using a pin or the like in the same manner as the third pin 7c described above in a state where the bumper 4 is lifted upward. By tying up, the relative position of the one end part (connection part with the rotation piece 33) of a spring member and the 2nd pin 7b does not fluctuate. Therefore, when the packing box 1 is tilted, the bumper stay 3 also rotates and the bumper also rotates. Note that the other end of the spring member may be connected to the floor portion 13 of the packing box 1 without using the short arm or the like as long as the bumper stay 3 also rotates well as the packing box 1 tilts. Absent.

  In addition, although the connection means such as the connection arm 7 is configured to connect the cargo box 1 and the rotating piece 33, other configurations may be used as long as the above-described effects are similarly achieved. In other words, the bumper stay 3 or the bumper 4 can be rotated up and down with respect to the vehicle frame 2, and the bumper 4 can be changed to a posture in which the bumper 4 is lifted upward. As long as the bumper 4 can also be rotated together, one end of the connecting means may be connected to the bumper 4 or the tip end portion 32 of the bumper stay 3 instead of the rotating piece 33.

  The present invention is useful for all dump vehicle bumpers that perform dump discharge.

DESCRIPTION OF SYMBOLS 1 Cargo box 2 Vehicle frame 3 Bumper stay 4 Bumper 5 Lifting device 6 Hinge part 7 Connection arm (connection means)
8 Waste collection site 9 Waste 11 Tailgate (packing box)
12 Side gate (packing box)
13 Floor (packing box)
21 Chassis frame 22 Subframe 31 Tip (Bumperstay)
32 Middle part (Ban Paste)
33 Rotating piece (Ban Paste)
71 Long hole (connecting means)
7a 1st pin 7b 2nd pin 7c 3rd pin 81 Vehicle running part (discharge collection place)
82 Wheel stop (exhaust dump)
83 Accumulation Department (Emissions Depot)
100 Bumper for dump vehicle

Claims (3)

A dumper bumper mounted on the bumper stay is supported by a bumper stay pivotally supported at the rear of the vehicle frame at a rear portion of the vehicle frame so as to be tiltable with respect to the vehicle frame extending in the front-rear direction. And
The bumper stay is provided with a rotating piece whose center of rotation is a shaft support part with the vehicle frame,
The rotating piece is movably connected to a connecting means whose one end is connected to the cargo box, and holds or holds a relative position with respect to the connecting means by restricting movement with respect to the connecting means. The holding means that can be released is connected,
In a state where the bumper stay is turned upward and the turning piece is moved to the one end side of the connecting means, the turning piece is held by the holding means, so that the relative position with respect to the connecting means is reached. The packing box can be tilted while holding
In the state where the holding by the holding means is released and the bumper stay is turned downward from the state where the bumper stay is turned upward, the rotating piece is moved relative to the connecting means by the tilting operation of the packing box. A bumper for a dump vehicle characterized by being movable. The connecting means is a plate member extending in substantially one direction,
One end of the connecting means is pivotally supported by the packing box,
The dump vehicle bumper according to claim 1, wherein the rotating piece is slidably connected to the other end of the connecting means. The connecting means is provided with a long hole whose longitudinal direction is substantially the one direction,
The connection means and the rotating piece are connected via an engagement pin inserted through the elongated hole, and the engagement pin slides on the connection means.
The dump vehicle bumper according to claim 2 , wherein the holding means is a securing member that restricts sliding of the engagement pin.

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