JP6172757B2 - Dump truck equipped with bumper load receiving lift - Google Patents

Description

  The present invention relates to a dump truck on which a cargo receiving platform lifting device is mounted.

  The dump truck tilts the packing box with a dump device and discharges the load in the packing box to the rear of the vehicle. Also known is a dump truck that uses a load receiving platform lifting device for loading and unloading (for example, Patent Document 1).

  For example, in the case of the dump truck 900 in which the load receiving table lifting device 90 of FIG. 4A is mounted, the load receiving table 91 is lifted and lowered in the horizontal posture shown by the solid line along the pair of left and right columns 92 (arrow A91), At the time of running the dump truck, the posture is changed to the standing posture shown by the alternate long and short dash line (arrow A92). The load receiving table 91 is connected to a slider 93 that can be moved up and down in the support column 92, and the load receiving table 91 moves up and down as the slider 93 moves up and down. When the horizontal load box 901 is tilted backward by the dump device (not shown), the load receiving table 91 and the support column 92 are also tilted backward (arrow A93) as shown in FIG. 4B.

  In such a dump truck 900, the support column 92 is fixed to the left and right ends, and the load receiving table lifting device 90 is mounted over the entire width of the vehicle. In the case of a dump truck in which the load receiving platform lifting / lowering device 90 is not mounted, the bumper is attached to the chassis frame. Need to avoid interfering with. Therefore, the dump truck 900 on which the load receiving table lifting device 90 is mounted is configured such that the bumper 94 is directly fixed to the load receiving table lifting device 90 and the bumper 94 also rotates together with the load box 901.

JP-A-6-8770

  With respect to the dump truck 900 having a configuration in which the bumper is directly fixed to the above-described load receiving platform lifting device 90, there is room for improvement in improving the cleanliness of exhaust gas.

  The present inventors paid attention to the performance and size of exhaust devices that have been improved in recent years. Many dump trucks 900 are provided with an exhaust device 910 at the rear of the vehicle. If an exhaust gas recirculation mechanism or the like is adopted to reduce the nitrogen oxide (NOx) in the exhaust gas with respect to such an exhaust device 910, the external shape becomes large, and the load receiving platform lifting device 90 and the exhaust device 910 are separated from each other. The distance L91 is reduced (see FIG. 4A). If the distance L91 is small, the bumper 94 directly covers the exhaust gas from the exhaust device 910. In particular, by adopting an exhaust gas recirculation mechanism or the like, exhaust gas at a high combustion temperature is exhausted, so that not only the bumper 94 is soiled but also the paint is peeled off and the bumper 94 is easily corroded. Therefore, although the strength as the bumper 94 is required, there is a risk that the strength is reduced.

  Further, as shown in FIG. 4B, when the load receiving table lifting / lowering device 90 also tilts with the tilt of the cargo box 901, the bumper 94 rotates to the front side of the vehicle (arrow A94). Therefore, when the distance L91 is reduced, the bumper 94 may interfere with the exhaust device 910. If the rear overhang ROH 90 is increased in order to prevent interference, the overall length of the vehicle exceeds the specified length. At this time, the departure angle α90 (see FIG. 4A) is also small, which is not preferable.

  In addition, when the bumper 94 is not directly exposed to the exhaust gas of the exhaust device 910 in the state where the distance L91 is small, the column 92 extends downward and the bumper 94 is moved downward. The ground clearance H91 will also be reduced.

  On the other hand, when the load receiving platform lifting / lowering device 90 is mounted at a position higher than the illustrated position and the bumper 94 is moved upward, the maximum rising height of the horizontal load receiving platform 91 is the floor height of the packing box 901. Since it is necessary to match with H92, the height of the packing box 901 is increased. Therefore, considering the loading / unloading of the luggage, the center of gravity of the vehicle, and the like, it is not preferable to simply raise the mounting position of the load receiving platform lifting / lowering device 90.

  The present invention has been made in view of these points, and based on an exhaust system having improved performance and size, the provision of a dump truck in which a load receiving device lifting apparatus with a bumper in which strength deterioration is prevented is mounted is provided. Objective.

  In the present invention, the following means are used to solve the above problems.

A dump truck according to the present invention includes a first vehicle body frame in which an exhaust device is fixed at a rear end with a longitudinal direction as a longitudinal direction, a hinge provided at a rear portion of the vehicle body frame, and a first vehicle body frame provided on the first vehicle body frame. A second vehicle body frame supported so as to be tiltable rearward of the vehicle with a hinge as a center, and a cargo box supported on the second vehicle body frame are provided. Further, the dump truck is pivotally supported by a pair of left and right columns fixed at the rear of the cargo box, or a connecting member fixed at the rear of the second body frame, and a slider that can be moved up and down in the column. A load receiving table lifting device including a link arm that is rotatable and a load receiving table that is connected to a slider or a link arm and is moved up and down between the ground and a cargo box is temporarily mounted. And this load receiving table raising / lowering device is provided with the bumper constructed by the pivotal support member in the said connection member by which the said each support | pillar or said link arm was pivotally supported. Furthermore, this bumper is characterized in that it is provided so as to be rotated to the upper side in the vertical direction of the exhaust device by tilting the second vehicle body frame.
Further, the above-described bumper may be configured to be provided adjacent to the exhaust device when the second vehicle body frame is in a horizontal state.
Further, the bumper may be provided so that the ground height is higher than the exhaust port of the exhaust device when the second vehicle body frame is in a horizontal state.
In addition, it is also possible to adopt a configuration in which the support column or the link arm is provided so as to rotate to the side of the exhaust device when the second vehicle body frame is tilted.

  According to the present invention, the bumper installed on the pair of left and right columns or the connecting member rotates around the hinge provided on the first vehicle body frame, so that the cargo box is in a horizontal state (a vehicle travelable state). The bumper rotates downward toward the front of the vehicle. Further, the bumper rotates and moves to a lower position as compared with the horizontal state, but the bumper according to the present invention is configured to be rotated to the upper side in the vertical direction of the exhaust device. The bumper is provided at a height that does not directly cover the exhaust gas of the exhaust device. That is, it is provided in the load receiving platform lifting / lowering device so as to be in a position close to the vehicle front-rear direction so as to reach a vertically upper side of the exhaust device when rotated, and to be a height position not affected by the exhaust gas of the exhaust device. Therefore, the bumper according to the present invention can maintain a desired strength without being affected by the performance and size of the exhaust device. And even if the box is tilted in the dump truck, interference between the bumper and the exhaust device can be prevented.

It is a rear part side view of the dump truck with which the load receiving base raising / lowering device with a bumper which concerns on embodiment of this invention was mounted. (A) is a side view showing a mounting member in the vicinity of a bumper in a dump truck mounted with a bumper load receiving device lifting apparatus according to an embodiment of the present invention, and (b) is a load receiving table lifting device in the side view. The schematic diagram shown, (c) is a schematic diagram showing the rear surface of the dump truck on which the load receiving and lifting device with bumper is mounted. It is a rear part side view of the dump truck by which the load receiving platform raising / lowering device with a bumper which concerns on another embodiment of this invention was mounted. It is a side view of the dump truck in which the load receiving platform raising / lowering device with a bumper according to the conventional embodiment is mounted.

  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 truck 100 that tilts the cargo box 1 downward and rearward. The dump truck 100 includes a first vehicle body frame (chassis frame) 1 having a pair of left and right as a longitudinal direction, a second vehicle body frame 2 provided on the first vehicle body frame 1, and a rear of the second vehicle body frame 2. A dump hinge 3 that is provided at an end and supports the second vehicle body frame 2 so as to be tiltable with respect to the first vehicle body frame 1, a cargo box 4 fixed to the upper part of the second vehicle body frame 2, and a rear portion of the cargo box 4 And a cradle lifting device 5 mounted on the vehicle body 1 and an exhaust device 6 fixed to the first vehicle body frame 1.

  The cargo box 4 is supported in a horizontal state as shown in the figure by the second vehicle body frame 2, and the dump truck 100 is allowed to travel in this state. The cargo box 4 is composed of a floor portion and a awning erected on its four sides. A load receiving platform 51 in the load receiving platform lifting / lowering device 5 is used for the rear saddle of the cargo box 4.

  The load receiving platform lifting / lowering device 5 includes a pair of left and right support columns 52 erected at the rear end of the load box 4 and a slider 53 that is inserted into the support columns 52 and can be moved up and down. It is supported so as to be rotatable between a horizontal posture and a standing posture.

One end of a wire (not shown) is fixed to the slider 53, and this wire is pulled upward to a sheave 52a fixed to the upper portion of the support column 52, and is stretched in a state where the sheave 52a is folded downward. It is installed.
The load receiving platform lifting / lowering device 5 also has a configuration in which a cross member 54 and a bumper 55 are installed between the left and right support columns 52 with the vehicle width direction as a longitudinal direction.

  The cross member 54 is provided at a height such that the upper surface thereof substantially coincides with the upper surface (floor surface) of the floor portion of the cargo box 4. A fixed sheave (not shown) around which the wire is wound is provided at both ends of the cross member 54, and one hydraulic cylinder (not shown) is provided between the left and right fixed sheaves along the longitudinal direction. Is decorated. The wire drawn into the cross member 54 from the fixed sheave is wound around the moving sheave provided at the rod tip of the hydraulic cylinder and is fixed to the fixed end of the cross member 54. The moving sheave moves in the rod expansion / contraction direction.

  The wire is drawn into the support column 52 by the expansion and contraction operation of the hydraulic cylinder, or is pulled into the cross member 54 from the support column 52 to move the slider 53 up and down. As the slider 53 moves up and down, the load receiving platform 51 also moves up and down (arrow A1). That is, when loading / unloading a load between the inside of the cargo box 4 and the ground using the load receiving table lifting / lowering device 5, the load receiving table 51 in the horizontal posture (solid line portion) shown in the figure is raised and lowered. Note that when the dump truck 100 is set in the traveling state without being used for the loading and unloading work, the receiving platform 51 is in the standing posture (the chain line portion), and is rotated between the standing posture and the horizontal posture (arrow A2). Is done manually.

  The bumper 55 is provided below the cross member 54, and is provided at a height that is higher than the lower end of the support column 52 by a predetermined height H1. The predetermined height H1 is set to be substantially the same as the ground height of the lower surface 1a of the first vehicle body frame 1. Further, the bumper 55 is provided closer to the front end portion (left end portion in the figure) of the support column 52.

  As shown in the figure, the exhaust device 6 has a size from the rear wheel RT to the rear end of the first vehicle body frame 1 when viewed from the side, and is a predetermined distance slightly away from the support 52 in the front-rear direction. It is provided in a state separated by a length L1. As shown in the figure, it is possible to prevent interference with the load receiving platform lifting device 5 that lifts the load receiving platform 51 in the vertical direction by being separated forward. The exhaust device 6 having the above-mentioned size has an exhaust gas recirculation mechanism, and exhausts exhaust gas at a high combustion temperature outward from the exhaust port 6a. The exhaust port 6a is provided at a position below the bumper 55 by a predetermined height H2. In the drawing, the height H2 is set to be larger than the above-mentioned predetermined height H1, but the height H1 is higher than the height H2 as a shape in which the support column 52 is extended below the illustrated length. A large configuration may be used. Further, since the exhaust device 6 reaches the rear end portion of the first vehicle body frame 1 as described above, the exhaust device 6 also extends vertically below the hinge 3 at a position separated from the support 52 by a predetermined length L2 toward the front side.

  In the dump truck 100 configured as described above, when the second vehicle body frame 2 is tilted by the dump device 7 including the hydraulic cylinder 71, as shown in FIG. Tilt to the vehicle rear side (clockwise in the figure) (arrow A3). At this time, the load receiving platform 51 is in a horizontal posture in order to discharge the load in the cargo box 4 to the rear of the vehicle, and the rear side of the cargo box 4 is opened by this posture. Regarding the tilt angle by the dump device 7, the maximum angle is the degree to which the tip 51a of the load receiving platform 51 is close to the ground.

  When the tilting of FIG. 1B is performed, the support columns 52 positioned at both left and right ends of the dump truck 100 are rotated to a position overlapping the exhaust device 6 when viewed from the side so as to sandwich the exhaust device 6. The bumper 55 provided on the support column 52 rotates to a position that is vertically above the exhaust device 6 in the region of the length L3 in the front-rear direction. Further, the position where the bumper 55 is rotated is a position substantially coincident with the vertically lower side of the hinge 3 and is a position close to the lower surface 1 a of the first vehicle body frame 1.

  As described above, the bumper 55 is provided at a position higher than the lower end portion of the support column 52 by the height H1, so that the exhaust gas from the exhaust device 6 that is only a distance L1 away is not directly covered, and the high-temperature exhaust gas is exhausted. Even if the gas is exhausted, the metal plating layer of the bumper 55 does not melt. That is, corrosion of the bumper 55 and the like can be prevented, and a decrease in the strength of the bumper 55 can be prevented.

  In addition, when the dump device 7 is tilted, the bumper 55 rotates so as to sink into the space between the first vehicle body frame 1 and the exhaust device 6, so that interference with the exhaust device 6 can also be prevented. Furthermore, since the bumper 55 rotates forward about the hinge 3 in front of the support column 52, interference with the first vehicle body frame 1 can also be prevented.

  As is well known, the inner wall of the support 52 serves as a guide for the lifting and lowering operation of the slider 53. Therefore, as described above, the lower end of the support 52 has a shape that extends below the bumper 55 by the height H1. As a result, the load receiving platform 51 can contribute to a stable raising / lowering operation with respect to the ground contact state (two-dot chain line portion in FIG. 1A) in the horizontal posture. That is, the column 52 is provided at a relatively high position rather than the lowermost end portion of the column 52 (height H1) while realizing a stable raising / lowering operation of the load receiving platform 51 by ensuring a desired ground clearance. By using the bumper, it is possible to simultaneously prevent the strength reduction by the exhaust device 6 and the interference with the exhaust device 6 during tilting, and the limited space below the cargo box 4 can be used effectively.

The dump truck 100 according to the present embodiment is different from a configuration in which a bumper is fixed to the first vehicle body frame 1 via an attachment stay like a known dump truck in which the load receiving platform lifting apparatus 5 is not mounted. 5 is characterized in that it is provided at the above-described height of the columns 52 tilting together with the packing box 4 without changing the height of the bodywork 5. In other words, in the configuration in which the load receiving table lifting device 5 is mounted with the height Hf substantially matching the floor surface of the load box 4 as the highest position, good loading and unloading between the load receiving table 51 and the load box 4 is possible. In order to achieve this, it is not necessary to raise the floor surface of the cargo box 4 by increasing the volume of the second vehicle body frame 2 or the like, and the dump truck 100 having the relatively low floor cargo box 4 can be obtained. Therefore, the dump truck 100 has a configuration in which the load receiving platform lifting / lowering device 5 with the bumper 55 capable of maintaining high strength is provided while having the high-performance exhaust device 6, and the floor of the cargo box 4 is lowered and the center of gravity is low. Can also be realized.
Next, the bumper 55 provided at the above-described height and its peripheral devices will be described with reference to FIG.

  As shown in FIG. 2A, in addition to the bumper 55, the tail lamp R and the number plate holder of the dump truck 100 are provided below the cross member 54 provided so that the floor surface F and the upper surface of the packing box 4 substantially coincide with each other. NF is provided. The tail lamp R and the license plate holder NF are provided on the rear side of the bumper 55 closer to the front of the support column 52, but are positioned so as not to protrude from the rear surface of the support column 52.

Specifically, the distance between the center point P1 of tilting by the dump device 7 (center point of the hinge 3) and the rear lower end point P2 of the bumper 55 is greater than the distance from the center point P1 to the vertical lower point P3 in the exhaust device 6. Is set too small. The distance from the center point P1 to the front upper end point P4 of the bumper 55 is set to be larger than the distance between the center point P1 and the rear lower end point P5 of the first vehicle body frame 1. Further, the rear lower end point P2 is lower than the rear lower end point P5, and the front upper end point P4 is higher than the rear lower end point P5.
While the tail lamp R is provided below the cross member 54, a predetermined upward irradiation angle α1 is set.

  The number plate holder NF is provided at a position substantially overlapping with the bumper 55 when viewed from the rear (right side in the drawing) as shown in FIG. Specifically, the upper end portion of the license plate holder is fastened via the angle member B1 fixed to the lower surface 54a of the cross member 54 and the mounting bracket B2 fixed to the angle member B1, and the bumper 55 The center portion of the license plate holder NF is fastened via a bent support bracket B3 fixed to the upper surface 55a. With such fastening, the license plate holder NF is fixed to the cross member 54 and the bumper 55.

  Since the tail lamp R and the license plate holder NF are attached as described above in a limited region below the cross member 54, the bumper 55 can be provided at the height described above.

  The dump truck 100 has been described using a configuration in which the load receiving platform lifting / lowering device 5 in which the load receiving platform 51 is lifted / lowered in the vertical direction is mounted, but the load receiving platform lifting / lowering device 500 as shown in FIG. 3 is mounted. It doesn't matter. A description will be given with reference to FIG. 3 focusing on parts different from the embodiment described above. For convenience of explanation, the same parts are denoted by the same reference numerals.

  The load receiving table elevating device 500 includes a load receiving stand 501 secured in an upright posture, a connecting member 502 fixed to the second vehicle body frame 2 that supports the load receiving stand 501, and left and right of the connecting member 502. A connecting pipe 503 that also functions as a bumper, an attachment member 504 provided at both ends of the connection pipe 503, and a pivot arm 505 that is pivotally supported by the attachment member 504 so as to be pivotable. ing.

  The load receiving platform lifting / lowering device 500 is mounted so that the load receiving stand 501 deployed from the standing posture to the horizontal posture has substantially the same height as the floor surface of the load box 4. Further, a rotating arm 505 is fixed to the second vehicle body frame 2 that supports the packing box 4, and the packing box 4 is rearward of the vehicle (right side in the figure) by the dump device 7 (see FIG. 1B). When tilted to the right, the load receiving table lifting device 500 tilts in the same manner.

  The rotating arm 505 has an upper lift arm 505 a and a lower compression arm 505 b, and each is pivotally supported by an attachment member 504. One end of the arms 505a and 505b on the vehicle front side is pivotally supported by a mounting member 504, and the other end is pivotally supported by a plate-like column 506 whose longitudinal direction is the vertical direction. Via this column 506, the load receiving table 501 is rotatably connected to the rotating arm 505.

  Two mounting members 504 are formed by a pair of mounting brackets, and a hydraulic cylinder 507 is mounted between the two mounting brackets. The attachment of the hydraulic cylinder 507 in the load receiving platform lifting / lowering device 500 is known (for example, Japanese Patent Application Laid-Open No. 2012-158278), and the rotation arm 505 is rotated up and down by using the expansion and contraction of the hydraulic cylinder 507. The rotating arm 505 forms a parallel link mechanism via the mounting member 504 and the column 506, and the load receiving table 501 deployed in a horizontal state is moved up and down while maintaining its posture.

  As shown in the figure, the connecting pipe 503 that functions as a bumper is provided at a position where the ground height is larger than that of the exhaust device 6 and is lower than that of the first vehicle body frame 1. When the cargo box 4 tilts, the connecting pipe 503 rotates around the hinge 3 so as to sink into a region between the first vehicle body frame 1 and the exhaust device 6. Therefore, similarly to FIG. 1, the connecting pipe 503 does not directly receive the exhaust gas from the exhaust device 6, and does not interfere with the exhaust device 6 when the cargo box 4 is tilted.

  As described above, in the dump truck 100 in which the load receiving platform lifting / lowering device 5 with the bumper 55 and the connecting pipe 503 is mounted, the dump device 7 can satisfactorily hold the cargo box 4 even if the performance of the exhaust device 6 is improved or the size is increased. It can be tilted, and a decrease in the strength of the bumper can be prevented.

  The present invention is useful for all dump trucks in which a load receiving platform lifting device is mounted at the rear of the vehicle.

DESCRIPTION OF SYMBOLS 1 1st vehicle body frame 2 2nd vehicle body frame 3 Hinge 4 Cargo box 5 Load receiving device raising / lowering device 6 Exhaust device 7 Dump device 51 Load receiving plate 52 Column 53 Slider 54 Cross member 55 Bumper 6a Exhaust port (exhaust device)
100 tipper

Claims (4)

A first body frame in which an exhaust device is fixed to a rear end portion with a longitudinal direction of the vehicle as a longitudinal direction;
A hinge provided at the rear of the vehicle body frame;
A second vehicle body frame provided on the first vehicle body frame and supported to be tiltable rearward of the vehicle about the hinge;
A packing box supported on the second body frame;
A pair of left and right columns fixed to the rear part of the packing box, or a connecting member fixed to the rear part of the second vehicle body frame;
A slider capable of moving up and down in the column, or a link arm pivotally supported by the connecting member;
A load receiving platform connected to the slider or the link arm and moved up and down between the ground and the cargo box;
A bumper erected on a pivot member in the connecting member pivotally supported by the left and right pillars or the link arm;
With
The bumper is provided so as to be rotated to the upper side in the vertical direction of the exhaust device by tilting of the second vehicle body frame. The bumper is mounted so as to be adjacent to the exhaust device when the second vehicle body frame is in a horizontal state. Dump truck. The bumper lift with a bumper according to claim 2, wherein the bumper is provided so that a ground clearance is higher than an exhaust port of the exhaust device when the second body frame is in a horizontal state. A dump truck equipped with equipment. 2. The lifting support for a bumper with a bumper according to claim 1, wherein the column or the link arm is provided so as to rotate to the side of the exhaust device when the second body frame tilts. A dump truck equipped with equipment.

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