JP2017154570A - Cargo box for dump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo box for a dump truck of which water tightness is assured in the state that a tail gate is closed.SOLUTION: A cargo box 5 for a dump truck comprising a cargo box body 10, a tail gate 30, and a drive cylinder 50, the cargo box body 10 comprises a tail gate support part 12 which supports the tail gate 30, an elastic body cover 18 which is covered on a rear end opening edge of the cargo box body 10, and the rear end opening edge of the cargo box body is so obliquely configured that an upper part thereof is positioned on a front side with respect to a lower part in a side view. The tail gate 30 comprises a gate plate 31, and an arm 32 which is supported by the tail gate support part 12 and is connected to the cargo box body 10, and which has a cylinder connection part 36 which rotatably supports a tip of an output rod 55 of the drive cylinder 50. The cargo box is so configured that by contraction of the drive cylinder 50, the gate plate 31 is tightly adhered to the elastic body cover 18 of the cargo box body 10, thereby closing a rear end opening.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dump truck packing box.

  The dump truck is a structure in which a dump truck container (vessel) is installed on the chassis, which is the basic structure. The dump truck can be rotated between a horizontal posture and an inclined posture with the front side raised. It is configured.

  In addition, the rear end of the cargo box is opened to slide and discharge the load in an inclined position, and a tailgate for opening and closing the rear end opening is rotatable at the rear end of the cargo box. Is installed.

  The dump truck box having such a structure is disclosed in, for example, Patent Documents 1 to 3 below. Further, in the packing boxes disclosed in Patent Documents 1 to 3, in order to prevent the tailgate from opening and dropping the load while the dump truck is running, the closed tailgate is locked. The configuration is disclosed.

JP 2010-70103 A Japanese Patent Laid-Open No. 8-183381 Japanese Utility Model Publication No. 2-117919

  However, with conventional dump truck boxes, even if the tailgate is locked in the closed state, there is no water tightness between the tailgate and the box body. However, there was a problem that muddy water dropped from the packing box.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a dump truck packing box that ensures water tightness with the tailgate closed.

  A dump truck packing box according to the present invention for solving the above problems includes a packing box body, a tailgate that opens and closes a rear end opening of the packing box body, and a drive cylinder that is an opening and closing drive source of the tailgate. , Wherein the packing box body is installed at the left and right ends of the rear part thereof, and the tailgate support part that pivotally supports the tailgate so as to be rotatable about a horizontal horizontal opening / closing axis. And an elastic body cover that covers the rear end opening edge of the packing box body, and the rear end opening edge is inclined so that the upper part is positioned on the front side rather than the lower part in a side view. The tailgate is an arm connected to the main body of the cargo box supported by the tailgate support portion installed on the left and right side ends of the gate plate and the gate plate, and the drive cylinder And an arm having a cylinder connecting portion that pivotally supports the tip of the output rod about a horizontal axis in a horizontal direction, and the drive cylinder is contracted so that the elastic body cover of the cargo box body The gate plate is configured to be in close contact so as to close the rear end opening.

  According to the dump truck packing box of the present invention, water tightness can be ensured with the tailgate closed, and muddy water can be prevented from falling from the packing box.

FIG. 1 is a side view of a dump truck according to an embodiment of the present invention. FIG. 2 is a perspective view of the packing box according to the embodiment of the present invention as viewed obliquely from the rear. FIG. 3 is an enlarged side view of the rear end portion of the packing box according to the embodiment of the present invention. FIG. 4 is a side view for explaining the operation of the opening / closing guide bracket according to the embodiment of the present invention.

  Hereinafter, dump truck boxes (vessels) according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the dump truck according to the present embodiment. FIG. 2 is a perspective view of the packing box according to the present embodiment as viewed obliquely from the rear, and shows an open state in which the tailgate is opened.

  3A and 3B are enlarged side views of the rear end portion of the packing box according to the present embodiment. FIG. 3A shows a closed state of the tailgate, and FIG. 3B shows an open state of the tailgate. In the present embodiment, the traveling direction of the dump truck 1 is referred to as the front-rear direction, and the left-right direction perpendicular to the traveling direction is referred to as the lateral direction.

  As shown in FIG. 1, the dump truck 1 includes a chassis 2 that is a basic component and a packing box 5. The packing box 5 is installed on the chassis 2 so as to be rotatable between a horizontal state indicated by a solid line in FIG. 1 and an inclined state indicated by a two-dot chain line. The packing box 5 includes a packing box body 10, a tailgate 30 installed at the rear end of the packing box body 10 so as to be openable and closable, and a hydraulic cylinder 50 as a drive source for opening and closing the tailgate 30.

  The cargo box body 10 includes a tailgate opening / closing shaft 12, a cylinder support shaft 13, an opening / closing guide bracket 15, and an elastic body cover 18. The shape of the cargo box body 10 is a substantially semi-elliptical shape with a cross section perpendicular to the front-rear direction (traveling direction) projecting downward, and is generally a semi-elliptical prism shape as a whole. Specifically, the bottom surface and both side surfaces of the packing box main body 10 are flat surfaces having a central portion that is bent several times by a predetermined angle as they move away from the central portion to the left and right. It has become.

  Further, the rear end of the packing box body 10 is open. The rear end opening edge of the cargo box body 10 is inclined so that the upper side is positioned forward than the lower side in a side view as viewed from the lateral direction. In this embodiment, the inclination angle is about 15 °. Of course, the shape of the packing box body 10 can be changed as appropriate, and may be a substantially rectangular parallelepiped box.

  The tailgate opening / closing shaft 12 is a horizontal horizontal rotation shaft that pivotally supports the tailgate 30 so that the tailgate 30 can be opened and closed. The tailgate opening / closing shaft 12 is installed at the left and right upper ends near the rear end of the cargo box body 10. The cylinder support shaft 13 is a horizontal horizontal rotation shaft that pivotally supports one end of the hydraulic cylinder 50, and is installed at the left and right lower end portions near the rear end of the cargo box body 10.

  The opening / closing guide bracket 15 engages with an engagement bar 41 of the tailgate 30 described later during the opening / closing operation of the tailgate 30, and restricts the movement of the tailgate 30 in the vicinity of the closed position to move it in a predetermined direction. It is a gate opening and closing guide member.

  One open / close guide bracket 15 is installed at each of the left and right ends of the rear end of the cargo box body 10. The installation position in the height direction of the opening / closing guide bracket 15 is a position slightly lower than the center in the height direction of the cargo box body 10. The opening / closing guide bracket 15 is formed with a concave groove 15a in a side view seen from the lateral direction, and details thereof will be described later.

  The elastic body cover 18 is a rubber elastic body cover (elastic body packing) that covers the opening edge of the rear end of the cargo box body 10. When the tailgate 30 is pressed against the elastic body cover 18 in the closed state, the contact portion between the tailgate 30 and the cargo box body 10 is sealed, and the tailgate 30 portion of the cargo box 5 has a watertight structure.

  The tailgate 30 is connected to the cargo box body 10 so as to be rotatable between a closed state in which the rear end opening of the cargo box body 10 is closed and an open state in which the tail gate 30 is opened. The tailgate 30 includes a gate plate 31, which is an iron plate having a size covering the rear end opening of the packing box body 10, arms 32 installed on the upper left and right sides of the gate plate 31, and left and right side surfaces of the gate plate 31. And an engagement bar 41 installed so as to protrude horizontally in the lateral direction.

  The arm 32 is generally L-shaped in a normal state, and an arm connecting shaft that rotatably connects the first arm 33 having a short side, the second arm 34 having a long side, and the first arm 33 and the second arm 34. 38. The arm connection shaft 38 is a horizontal rotation shaft, and the first arm 33 and the second arm 34 are relatively rotatable around the rotation shaft.

  When viewed in the closed state of FIG. 3A, the first arm 33 extends in a substantially vertical direction and is fixed to the upper portions of the left and right side ends of the gate plate 31. The second arm 34 is configured to extend forward from the first arm 33 substantially horizontally.

  The second arm 34 is installed at the front end portion of the load box, and is supported by the tailgate opening / closing shaft 12 of the cargo box body 10, and between the cargo box connection portion 35 and the first arm 33. And a cylinder connecting portion 36 for connecting to the output member of the hydraulic cylinder 50.

  In the present embodiment, the second arm 34 rotates between a substantially horizontal state shown in FIG. 3A and a substantially vertical state shown in FIG. 3B by the driving force of the hydraulic cylinder 50. On the other hand, the first arm 33 tries to rotate downward with the arm connection shaft 38 as a rotation axis by its own weight of the gate plate 31 and the like, and therefore in contact with the second arm 34 in the open state shown in FIG. In the closed state shown in FIG. 3A, the elastic cover 18 at the rear end opening edge of the cargo box body 10 is obtained. The second arm 34 intersects with the second arm 34 at approximately 105 °.

  The engagement bar 41 is installed slightly below the center of the side surface of the gate plate 31 in the height direction. When the tailgate 30 is positioned in the vicinity of the closed position, the engagement bar 41 is attached to the opening / closing guide bracket 15 of the cargo box body 10. It is the engaging member which contacts. The moving direction of the engagement bar 41 is limited by contacting the opening / closing guide bracket 15.

  The hydraulic cylinder 50 is installed on each of the left and right side surfaces of the rear end of the cargo box body 10, and includes a cylinder tube 51 and an output rod 55 that is an output member that protrudes and retracts from the cylinder tube 51. The hydraulic cylinder 50 is installed in a state where the upper side from the vertical state is slightly inclined to the front side, and extends and contracts in this inclination direction with the output rod 55 as an output member.

  The cylinder tube 51 is rotatably connected to the cylinder support shaft 13 of the cargo box body 10 at the cargo box coupling portion 52 at the lower end, and the hydraulic cylinder 50 is laterally moved around the cargo box coupling portion 52. It can be rotated around a horizontal axis.

  The output rod 55 is rotatably connected to the cylinder connecting portion 36 of the arm 32 of the tailgate 30 at the tailgate connecting portion 56 at the upper end. Therefore, when the hydraulic cylinder 50 is extended and the output rod 55 is raised, the arm 32 is rotated upward about the tailgate opening / closing shaft 12 (see FIG. 3B), and the hydraulic cylinder 50 is contracted and the output rod 55 is moved. When lowered, the arm 32 pivots downward about the tailgate opening / closing shaft 12 (see FIG. 3A).

  Next, the configuration of the opening / closing guide bracket 15 and the engagement bar 41 will be described in detail. FIG. 4 is a side view for explaining the operation of the opening / closing guide bracket according to the present embodiment. The opening / closing guide bracket 15 is formed with a concave groove 15a opened upward in a side view, and a first inclined side 15b positioned on the front side of the inlet portion of the concave groove 15a and a first groove 15a are formed in the concave groove 15a. A second inclined side 15c is formed which is continuously located below the inclined side 15b.

  The first inclined side 15b is inclined such that the lower side is positioned forward from the vertical state. The second inclined side 15c is inclined such that the lower side is positioned rearward of the vertical state in the side view, and the second inclined side 15c is the rear end opening edge (elasticity) in the side view. It is substantially parallel to the body cover 18), and the lower side is inclined about 15 ° backward from the vertical state.

  Next, the operation during the closing operation of the tailgate 30 will be described. When the output rod 55 moves downward by driving the hydraulic cylinder 50, the gate plate 31 moves in the direction of closing the rear end opening of the cargo box body 10 about the tailgate opening / closing shaft 12 via the arm 32.

  At this time, the engagement bars 41 installed on both side surfaces of the gate plate 31 move downward on an arc centered on the tailgate opening / closing shaft 12, and in the vicinity of the closed position, first, the first of the opening / closing guide bracket 15 It contacts the upper part of the inclined side 15b and enters the concave groove 15a. As a result, the engagement bar 41 cannot move on the arc centered on the tailgate opening / closing shaft 12, and moves downward along the first inclined side 15b.

  When the direction of movement is limited by the opening / closing guide bracket 15 and the engagement bars 41 fixedly installed at both ends of the gate plate 31 are guided downward away from the arc, the gate plate 31 is also integrated with the engagement bar 41. It will move downward.

  As described above, when the engagement bar 41 contacts the opening / closing guide bracket 15, the first arm 33 and the gate plate 31 are limited to downward movement different from the rotation direction around the tailgate opening / closing shaft 12. On the other hand, the second arm 34 directly connected to the tailgate opening / closing shaft 12 can only rotate about the tailgate opening / closing shaft 12.

  The downward movement of the first arm 33 and the gate plate 31 different from the second arm 34 is caused by the relative rotation of the first arm 33 and the second arm 34 around the arm connecting shaft 38 described above. As the gate plate 31 moves downward, the crossing angle between the first arm 33 and the second arm 34 gradually opens from about 95 ° (see FIGS. 3A and 3B). ).

  Here, the packing box 5 is configured such that the gate plate 31 contacts the elastic body cover 18 of the packing box body 10 in the vicinity of the position where the engagement bar 41 contacts the first inclined side 15b of the opening / closing guide bracket 15. Has been.

  When the engagement bar 41 moves downward along the first inclined side 15b, the gate plate 31 further approaches the elastic body cover 18. When the gate plate 31 comes into contact with the elastic cover 18, the opening edge of the rear end of the cargo box body 10 is inclined so that the upper side is positioned forward in a side view, and the gate plate 31 is pressed against the elastic cover 18 by its own weight. Be in close contact. When the engagement bar 41 is moved to the lower end of the first inclined side 15b, the gate plate 31 and the elastic body cover 18 are brought into a close contact state.

  Subsequently, when the engagement bar 41 starts to move downward along the second inclined side 15 c, the gate plate 31 moves obliquely rearward and downward in parallel with the elastic body cover 18. That is, the gate plate 31 and the elastic cover 18 that are in close contact with each other are shifted, and the adhesion between the gate plate 31 and the elastic cover 18 is further improved.

  When the engagement bar 41 moves to the vicinity of the bottom of the concave groove 15a, the drive of the hydraulic cylinder 50 is stopped, the closing operation of the tailgate 30 is finished, and the rear end opening of the cargo box body 10 is closed by the tailgate 30. Closed.

  In the present embodiment, when the tailgate 30 is in the closed state, the gate plate 31 and the elastic body cover 18 that covers the rear end opening of the cargo box body 10 are in close contact, and the elastic body cover 18 functions as a packing. In addition, watertightness between the tailgate 30 and the packing box body 10 can be realized. In particular, in the present embodiment, a minute gap can be closed by bringing the gate plate 31 and the elastic cover 18 into close contact with each other and shifting them in parallel, thereby further improving water tightness.

  In the present embodiment, when the tailgate 30 is in the closed state, the engagement bar 41 is located at the bottom of the concave groove 15a of the opening / closing guide bracket 15, and the opening / closing guide bracket 15 and the engagement bar 41 are in the tail. It also functions as a lock mechanism that locks the gate 30 so as not to open.

  That is, when the gate plate 31 is opened, it is necessary to rotate rearward and upward about the tailgate opening / closing shaft 12, but if the engagement bar 41 is located at the bottom of the groove 15a, The combination bar 41 can move only upward, and cannot move rearward (right side in FIG. 4) because it collides with the rear wall of the groove 15a.

  In order to move the engagement bar 41 upward and out of the groove 15a, it is necessary to continuously apply a force larger than the gravity due to the weight of the gate plate 31 to the gate plate 31. Therefore, the tail gate 30 does not open with the force acting on the tail gate 30 due to impact or the like during traveling of the dump truck 1, and the closed state can be reliably locked.

  Of course, when the tail gate 30 is opened, a large upward force can be continuously applied to the gate plate 31 via the arm 32 by the hydraulic cylinder 50. As a result, the engagement bar 41 moves upward, and when the engagement bar 41 reaches the position of the first inclined side 15b, the engagement bar 41 can also move backward, and the gate plate 31 can be rotated upward and opened. it can.

  As described above, according to the present embodiment, the opening edge of the rear end of the cargo box body 10 is inclined so that the upper side is positioned forward than the lower side in a side view, and the closed gate plate 31 is elastic by its own weight. Since the cover 18 is pressed against and closely contacts, water tightness between the packing box body 10 and the tailgate 30 can be ensured.

  Further, in the present embodiment, the opening / closing guide bracket 15 formed with the recessed groove 15a opened upward is provided at the rear end of the packing box body 10, and the bottom of the recessed groove 15a when the tailgate 30 is in the closed state. The engagement bar 41 guided to is installed on the gate plate 31 and can be securely locked so that the closed tailgate 30 is not opened.

  The embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the size, shape, material, and the like of the members constituting the packing box can be changed as appropriate, and the shapes of the engagement bar as the engagement member and the opening / closing guide bracket as the tailgate opening / closing guide member can also be changed as appropriate.

  Moreover, in the said embodiment, although the hydraulic cylinder is employ | adopted as a drive cylinder, other drive cylinders, such as an air cylinder, can be employ | adopted suitably.

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Chassis 5 Packing box 10 Packing box main body 12 Tailgate opening / closing shaft 13 Cylinder support shaft 15 Opening / closing guide bracket 15a Groove 15b First inclined side 15c Second inclined side 18 Elastic body cover 30 Tailgate 31 Gate plate 32 Arm 33 First arm 34 Second arm 35 Packing box connecting part 36 Cylinder connecting part 38 Arm connecting shaft 41 Engaging bar 50 Hydraulic cylinder 51 Cylinder tube 52 Packing box body connecting part 55 Output rod 56 Tail gate connecting part

Claims (5)

In a dump truck packing box comprising a packing box body, a tailgate that opens and closes a rear end opening of the packing box body, and a drive cylinder that is an opening and closing drive source of the tailgate,
The packing box body is
A tailgate support portion that is installed at the left and right ends of the rear portion and pivotally supports the tailgate so as to be rotatable around a horizontal horizontal opening and closing shaft;
An elastic body cover placed on a rear end opening edge of the packing box body, and
The rear end opening edge is configured to be inclined so that the upper part is located on the front side rather than the lower part in a side view,
The tailgate is
A gate plate,
An arm that is installed on both left and right ends of the gate plate and is supported by the tailgate support and connected to the cargo box body, and the tip of the output rod of the drive cylinder is rotated around a horizontal horizontal axis. The arm having a cylinder connecting portion pivotally supported by
The dump truck packing box is configured such that the gate plate is brought into close contact with the elastic cover of the packing box main body and the rear end opening is closed by contraction of the driving cylinder. The cargo box body further includes tailgate opening / closing guide members installed at the left and right ends of the rear end portion for guiding the tailgate in a predetermined direction when the tailgate is closed.
The tailgate further includes engagement members that are installed at both left and right ends of the gate plate and that are guided in the predetermined direction by contacting the tailgate opening / closing guide member during the closing operation.
The dump truck packing box according to claim 1. The tailgate opening and closing guide member is formed with a concave groove in which the engagement member enters in the vicinity of the closed position of the tailgate and opened upward in a side view,
3. The dump truck box according to claim 2, wherein the engagement member is located in the concave groove when the tailgate is closed.   An inclined side substantially parallel to the inclined rear end opening edge of the cargo box body in a side view is formed on the front side in the concave groove, and the engagement is made after the gate plate comes into contact with the elastic cover. 4. The dump truck packing box according to claim 3, wherein the joint member is configured to be guided downward along the inclined side. The tailgate arm includes a first arm that is fixed to the gate plate, a second arm that is rotatably connected to the cargo box body, and the first arm and the second arm that are horizontally connected in a horizontal direction. An arm coupling shaft that is pivotably coupled around an axis,
The downward movement of the gate plate by the engagement member being guided downward along the inclined side is realized by the relative rotation of the first arm with respect to the second arm. The dump truck packing box according to claim 4.

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