Dump truck

Abstract

To provide a dump truck having a lower hinge which enables a worker to store a pin into a storage part.SOLUTION: A dump truck 1 includes a lower hinge 30 which is provided at a lower part of a tail gate 9 and a tail panel 8 and rotatably connects the tail gate 9 to a loading platform. The lower hinge 30 includes: a pair of left and right first brackets 31 each provided with a first pin hole 31a which is open in a lateral direction and extending downward from the lower part of the tail gate 9; a pair of left and right second brackets 32 each provided with a second pin hole 32a which is open in the lateral direction and connected to a rear part of the tail panel 8; a cylindrical storage part 33 which is connected to the first brackets 31 at a position higher than the first pin holes 31a and extends in the lateral direction; and a pin 34 which is configured to be inserted into or removed from the first pin holes 31a and the second pin holes 32a and configured to be inserted into or removed from the storage part 33.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a dump truck. [Background technology]

[0002] As described in Patent Document 1, a dump truck is known that has a tailgate at the rear of the loading platform that can be opened upward or downward. Here, "opening downward" means that the tailgate rotates from bottom to top around the upper part of the tailgate. "Opening upward" means that the tailgate rotates from top to bottom around the lower part of the tailgate.

[0003] Dump trucks with tailgates that can be opened both upward and downward as described above are equipped with a lower hinge that locks the tailgate when opened downward and rotatably supports the tailgate when opened upward. Patent Document 1 discloses a lower hinge that includes a first bracket fixed to the lower end of the tailgate and a second bracket fixed to a tail panel that extends downward from the rear lower end of the cargo bed. Each of the first bracket and the second bracket has pin holes that open to the left and right. In this lower hinge, the tailgate is locked when opened downward by overlapping the first bracket and the second bracket to the left and right and inserting pins into the pin holes formed in each bracket.

[0004] When the bottom-opening door is unlocked to perform tasks such as removing earth and sand from the loading platform, the pin is pulled out of the pin hole. To prevent the pulled-out pin from being lost, the pin is attached to the tail panel with a chain. If the pin is left hanging from the chain, it may swing and collide with vehicle parts such as lights, causing damage to the vehicle parts. Therefore, the lower hinge is sometimes provided with a storage section to store the pin when the bottom-opening door is unlocked. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-36113 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventionally, the storage compartment has often been installed on the rear (front) side of the tail panel, but this is a difficult location for workers to access.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a dump truck having a lower hinge that makes it easy for an operator to store a pin in a storage portion. [Means for solving the problem]

[0008] A dump truck according to the present invention comprises a chassis, a loading platform disposed on top of the chassis and having a tail panel, a tailgate provided at the rear of the loading platform with at least a portion thereof positioned above the tail panel, an upper hinge provided at the top of the tailgate and rotatably engaging the tailgate with respect to the loading platform, and a lower hinge provided at the bottom of the tailgate and on the tail panel and rotatably engaging the tailgate with respect to the loading platform. The lower hinge comprises a pair of left and right first brackets each having a first pin hole opening to the left and the right and extending downward from the bottom of the tailgate, a pair of left and right second brackets each having a second pin hole opening to the left and the right and connected to the rear of the tail panel, a cylindrical storage section extending to the left and the right and connected to the first bracket at a position above the first pin hole, and a pin configured to be insertable and removably inserted into the first pin hole and the second pin hole and configured to be insertable and removably inserted into the storage section. The tailgate is configured so that when the pin is inserted into the storage section, it can rotate from bottom to top using the upper hinge, and when the pin is inserted into the first pin hole and the second pin hole, it can rotate from top to bottom using the pin as a rotation axis.

[0009] According to the above configuration, the storage section is located in a position that is easy for an operator to work with. As a result, when unlocking the downward-opening position, the operator can easily pull the pin out of the first pin hole and the second pin hole and insert the pin into the storage section. Similarly, when locking the downward-opening position, the operator can easily pull the pin out of the storage section and insert the pin into the first pin hole and the second pin hole.

[0010] According to a preferred embodiment, the storage section is disposed so as to be spaced downward from the tailgate by a distance of 10 mm or more and 50 mm or less.

[0011] When performing welding work to join the first bracket and the tailgate, a welding torch needs to be inserted between the storage section and the tailgate. With this configuration, there is a sufficient gap between the storage section and the tailgate to insert the welding torch, making it easy to perform the welding work to join the tailgate and the first bracket.

[0012] According to a preferred embodiment, a portion of the outer periphery of the upper surface of the first bracket that extends in the front-rear direction is welded to the lower part of the tailgate.

[0013] When the tailgate is opened upward, it is supported by the lower hinge. Therefore, when the tailgate is opened upward, a load is applied to the joint between the first bracket and the tailgate. However, with the above configuration, the strength of the joint can be ensured because the welding is performed on the outer periphery of the top surface of the first bracket that extends in the front-to-rear direction.

[0014] According to a preferred embodiment, the upper portion of the first bracket is welded to the lower portion of the tailgate along its entire periphery.

[0015] This ensures sufficient strength at the joint between the first bracket and the tailgate.

[0016] According to a preferred embodiment, the inner diameter of the storage portion is 1.05 to 1.1 times the diameter of the pin.

[0017] According to this configuration, the storage section can be made as small as possible, while the pin can be smoothly inserted and removed from the storage section.

[0018] According to a preferred embodiment, the dump truck includes an imaging device that captures an image of the area behind the loading platform.

[0019] With this configuration, for example, the driver can check the situation behind the vehicle while driving the dump truck.

[0020] According to a preferred embodiment, the imaging device is attached to a center portion of the tail panel in the vehicle width direction, and the lower hinge is disposed outward in the vehicle width direction from the imaging device.

[0021] According to this configuration, when capturing an image of the area behind the vehicle, the image can be captured evenly in the vehicle width direction, and an image suitable for the driver to check the situation behind the vehicle can be obtained. [Effects of the Invention]

[0022] According to the present invention, a dump truck having a lower hinge that allows an operator to easily store the pin in the storage portion can be provided. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a side view of a dump truck according to an embodiment. [Figure 2] FIG. 2 is a rear view of the cargo bed and tailgate. [Figure 3] FIG. 10 is a view of the upper hinge from the left. [Figure 4] FIG. 10 is a rear view of the upper hinge. [Figure 5] FIG. 10 is a rear view of the automatic locking mechanism. [Figure 6]10 is a rear view of the lower hinge with the pins inserted into the first pin holes and the second pin holes. FIG. [Figure 7] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 8] FIG. 4 is a schematic diagram of a joint between the tailgate and the first bracket. [Figure 9] FIG. 10 is a rear view of the lower hinge with the latch piece and the pin body parallel to each other. [Figure 10] FIG. 10 is a rear view of the lower hinge with the pin inserted into the storage section. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a dump truck 1 according to this embodiment. The dump truck 1 according to this embodiment is a so-called 2-ton dump truck, which is a vehicle with a maximum load weight of about 2 tons. As shown in FIG. 1, the dump truck 1 includes a chassis 2, a cab 3, and a loading platform 4. The cab 3 and the loading platform 4 are supported by the chassis 2. The loading platform 4 is provided behind the cab 3. A driver's seat (not shown) is provided inside the cab 3.

[0025] In the following description, unless otherwise specified, the terms front, rear, left, right, up, and down refer to the front, rear, left, right, up, and down, respectively, as seen from the driver sitting in the driver's seat. The symbols F, Rr, L, R, U, and D in the drawings refer to the front, rear, left, right, up, and down, respectively. Therefore, in this specification, the vehicle width direction is the same as the left-right direction. In the following description, the side closer to the center of the dump truck 1 in the left-right direction is referred to as the inner side in the vehicle width direction, and the side away from this center is referred to as the outer side in the vehicle width direction.

[0026] As shown in Figures 1 and 2, the bed 4 has a bottom plate 5, a front plate 6 extending upward from the front end of the bottom plate 5, and side plates 7 extending upward from the left and right ends of the bottom plate 5. The bed 4 also has a tail panel 8 at the lower rear end. The tail panel 8 extends downward from the rear end of the bottom plate 5. Although not shown, the dump truck 1 is equipped with a dump mechanism that tilts the bed 4 rearward and downward. As the dump mechanism, various conventionally well-known dump mechanisms can be used. Since the configuration of a dump mechanism is well-known, a detailed description of the dump mechanism will be omitted here.

[0027] A tailgate 9 is provided at the rear of the cargo bed 4, allowing the rear of the cargo bed 4 to be opened and closed. At least a portion of the tailgate 9 is located higher than the tail panel 8. The tailgate 9 can be opened upward or downward. "Opening upward" here means that the tailgate 9 rotates from top to bottom around the lower part of the tailgate 9. "Opening downward" means that the tailgate 9 rotates from bottom to top around the lower part of the tailgate 9. With the tailgate 9 opened upward or downward to open the rear of the cargo bed 4, the cargo bed 4 can be tilted rearward and downward by a dump mechanism (not shown), allowing soil and sand loaded in the cargo bed 4 to be dumped. In the following description, the position of the tailgate 9 when the tailgate 9 closes the rear of the cargo bed 4 is referred to as the closed position.

[0028] As shown in Fig. 2, upper hinges 10 are provided at both ends of the upper part of the tailgate 9. Fig. 3 shows a side view of the left upper hinge 10, and Fig. 4 shows a rear view of the left upper hinge 10. Upper hinge brackets 11 are provided at both ends of the upper part of the tailgate 9. The upper hinge 10 has an upper hinge shaft 12 and a fastening metal fitting 13. The upper hinge shaft 12 is provided in the upper hinge bracket 11. The upper hinge shaft 12 extends in the left-right direction. The upper hinge shaft 12 serves as the center of rotation when the tailgate 9 is opened downward.

[0029] The lashing fittings 13 are provided at the upper rear end of each side panel 7. The lashing fittings 13 are fittings that secure the upper hinge shaft 12. The lashing fittings 13 have a receiving fitting 14, a lashing portion 15, and an operating handle 16. The receiving fitting 14 has a U-shaped socket that opens rearward. The lashing portion 15 is formed in the same shape as this U-shaped socket, and is rotatably supported by the receiving fitting 14. The lashing portion 15 is provided at the base end of the operating handle 16. The operating handle 16 is configured to be rotatable up and down. When opening the tailgate 9 upward, the upper hinge shaft 12 is released from its lashing using the operating handle 16. On the other hand, when opening the tailgate 9 downward, the upper hinge shaft 12 is in a secured state.

[0030] As shown in FIG. 2 , automatic locking mechanisms 20 are provided on the lower portion of the tailgate 9 and the tail panel 8. The dump truck 1 of this embodiment is equipped with two automatic locking mechanisms 20. A conventionally known mechanism can be used as the automatic locking mechanisms 20. The configuration of the automatic locking mechanisms 20 may be the same as that of the gate opening / closing device disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-221950. Since the configuration of the automatic locking mechanisms 20 is well known, a detailed description thereof will be omitted here. The automatic locking mechanisms 20 are configured to automatically unlock in conjunction with the tilting of the loading platform 4. As shown in FIG. 5 , the automatic locking mechanism 20 includes a lower shaft 22, a guide plate 23, a hook 24, and an operating mechanism (not shown) that operates the hook 24. The lower shaft 22 is connected to a pair of left and right brackets 21 provided on the tailgate 9. The guide plate 23 is provided on the front side of the tail panel 8 to correspond to the lower shaft 22 and extends in the up-down and front-rear directions. The hook 24 is disposed in a rectangular opening 8a formed in the tail panel 8, and protrudes from the rear side to the front side of the tail panel 8. The operating mechanism is configured to operate the hook 24 in response to the tilting of the cargo bed 4. Here, the front side of the tail panel 8 refers to the rear side of the vehicle, and the rear side of the tail panel 8 refers to the front side of the vehicle.

[0031] As shown in FIG. 2, a lower hinge 30 is provided on the lower part of the tailgate 9 and on the tail panel 8, separate from the automatic locking mechanism 20. The dump truck 1 of this embodiment is equipped with two lower hinges 30. The lower hinges 30 are arranged more inward in the vehicle width direction than the automatic locking mechanism 20. The lower hinges 30 are a member that can lock the tailgate 9 when it is opened downward and also serve as a rotation axis when the tailgate 9 is opened upward. FIG. 6 is a view of the lower hinge 30 arranged on the left side as seen from the rear. Also, FIG. 7 is a view of the lower hinge 30 arranged on the left side as seen from the left. As shown in FIGS. 6 and 7, the lower hinge 30 includes a pair of left and right first brackets 31, a pair of left and right second brackets 32, a storage portion 33, a pin 34, and a chain 35.

[0032] The first bracket 31 extends downward from the lower part of the tailgate 9. The first bracket 31 and the tailgate 9 are joined by welding the upper part of the first bracket 31 to the lower part of the tailgate 9. FIG. 8 is a schematic diagram of a joint 37 (welded part) between the first bracket 31 and the tailgate 9 in this embodiment. To ensure the strength of the joint 37 between the first bracket 31 and the tailgate 9, as shown in FIG. 8, it is preferable that at least a portion of the outer periphery of the upper surface of the first bracket 31 extending in the front-to-rear direction is welded to the lower surface of the tailgate 9. In this embodiment, the upper part of the first bracket 31 is welded to the lower part of the tailgate 9 all around. Full-circumference welding is a welding method in which the final welded part forms a ring and seals the two components to be welded without any gaps. In this embodiment, the entire outer periphery of the upper surface of the first bracket 31 is welded to the lower surface of the tailgate 9. However, full-circumference welding as used here does not only refer to a case in which the outer periphery of the upper surface of the first bracket 31 is welded without any gaps all around, but also includes a case in which the outer periphery can be considered to be substantially the entire periphery. The welding that can be regarded as substantially the entire circumference means, for example, that 90% or more of the entire circumference is welded. This ensures sufficient strength of the joint 37 between the first bracket 31 and the tailgate 9. The first bracket 31 is formed with a first pin hole 31a that opens in the left-right direction.

[0033] As shown in FIG. 7 , the second bracket 32 ​​extends rearward from the tail panel 8. The second bracket 32 ​​is joined to the surface of the tail panel 8 by welding. The distance between the pair of left and right second brackets 32 is greater than the distance between the pair of left and right first brackets 31. As shown in FIG. 6 , the pair of left and right first brackets 31 and the pair of left and right second brackets 32 are provided so that the pair of left and right first brackets 31 are disposed between the pair of left and right second brackets 32 when the tailgate 9 is in the closed position. The second bracket 32 ​​is formed with a second pin hole 32a that opens in the left-right direction. In this embodiment, the diameter of the second pin hole 32a is equal to the diameter of the first pin hole 31a. The first pin hole 31a and the second pin hole 32a are formed so that the first pin hole 31a and the second pin hole 32a are in the same position in the front-rear direction and the up-down direction when the tailgate 9 is in the closed position.

[0034] The storage section 33 is joined to the first bracket 31 by welding. The storage section 33 is formed in a tubular shape and extends in the left-right direction. In this embodiment, the storage section 33 is formed in a cylindrical shape. Note that the shape of the storage section 33 is not limited to a cylindrical shape, and may be a rectangular tubular shape. The storage section 33 is disposed at a position above the first pin hole 31a.

[0035] The pin 34 is attached to the bottom of the tailgate 9 by a chain 35, which prevents the pin 34 from being lost. The pin 34 is configured to be freely insertable and removable into the first pin hole 31a and the second pin hole 32a. The pin 34 includes a pin body 34a and a latching piece 34b rotatably connected to the tip of the pin body 34a. As shown in FIG. 6, by rotating the latching piece 34b 90° relative to the pin body 34a, the pin 34 can be prevented from falling out of the first pin hole 31a and the second pin hole 32a. As shown in FIG. 9, by aligning the pin body 34a and the latching piece 34b parallel to each other, the pin 34 can be inserted and removed into the first pin hole 31a and the second pin hole 32a. Furthermore, as shown in FIG. 10, the pin 34 is also configured to be freely insertable and removable into the storage section 33.

[0036] Incidentally, when welding the tailgate 9 and the first bracket 31, if the distance L1 (see FIG. 6 ) between the tailgate 9 and the storage section 33 is small, it is difficult to insert a welding torch between the tailgate 9 and the storage section 33, making the welding difficult. Therefore, it is preferable to increase the distance L1 between the tailgate 9 and the storage section 33. One method for increasing the distance L1 between the tailgate 9 and the storage section 33 is to reduce the size of the lower hinge 30. In particular, reducing the diameter of the pin 34 allows the diameter of the first pin hole 31 a, the diameter of the second pin hole 32 a, and the inner and outer diameters of the storage section 33 to be reduced, thereby reducing the size of the entire lower hinge 30. Note that the lower hinge 30 is a member that supports the tailgate 9 when the tailgate 9 is opened upward, so it is important to note that a certain level of strength is required for the lower hinge 30 when reducing its size. In this embodiment, the diameter of the pin 34 is 16 mm. The inner diameter of the storage section 33 is preferably about 1.05 to 1.1 times the diameter of the pin 34 so that the pin 34 can be inserted and removed smoothly. In this embodiment, the inner diameter of the storage section 33 is 17.1 mm. In this embodiment, the inner diameter of the storage section 33 is equal to the diameter of the first pin hole 31a and also equal to the diameter of the second pin hole 32a. In order to ensure sufficient strength of the storage section 33, the outer diameter of the storage section 33 is preferably about 1.3 to 1.4 times the diameter of the pin.

[0037] Another method for increasing the distance L1 between the tailgate 9 and the storage compartment 33 is to position the lower hinge 30 relatively low. However, positioning the lower hinge 30 at a low position may impair the visibility of vehicle components such as the license plate and lights. Therefore, the distance L1 between the tailgate 9 and the storage compartment 33 must be set within an appropriate range that allows a welding torch to be easily inserted between the tailgate 9 and the storage compartment 33 without impairing the visibility of vehicle components such as the license plate and lights. For example, the distance L1 between the tailgate 9 and the storage compartment 33 is preferably set within a range of 10 mm to 50 mm. The distance L1 may be 10 mm to 40 mm, 10 mm to 30 mm, or 10 mm to 20 mm. In this embodiment, the distance L1 between the tailgate 9 and the storage compartment 33 is approximately 12 mm.

[0038] As shown in FIG. 2, the dump truck 1 is equipped with an imaging device 40 that captures images of the area behind the vehicle. In this embodiment, the imaging device 40 is attached to the tail panel 8. The imaging device 40 is disposed in the center of the dump truck 1 in the vehicle width direction. The lower hinge 30 is disposed further outward in the vehicle width direction than the imaging device 40. A monitor (not shown) that displays images captured by the imaging device 40 is provided inside the cab 3. This allows the driver to check the situation behind the vehicle in real time while inside the cab 3.

[0039] When opening the tailgate 9 upward, the upper hinge shaft 12 is released from fastening while the pin 34 is inserted into the first pin hole 31a and the second pin hole 32a as shown in Figure 6. This allows the tailgate 9 to rotate from top to bottom around the pin 34 and the lower shaft 22 as a rotation axis. On the other hand, when opening the tailgate 9 downward, while the upper hinge shaft 12 is fastened, the pin 34 is released from the first pin hole 31 and the second pin hole 32a and inserted into the storage portion 33 as shown in Figure 10. This allows the tailgate 9 to rotate from bottom to top around the upper hinge shaft 12.

[0040] According to this embodiment, the dump truck 1 includes an upper hinge 10 that is provided on an upper portion of the tailgate 9 and rotatably engages the tailgate 9 with respect to the loading platform 4, and a lower hinge 30 that is provided on a lower portion of the tailgate 9 and on the tail panel 8 and rotatably engages the tailgate 9 with respect to the loading platform 4. The lower hinge 30 includes a first bracket 31, a second bracket 32, a storage portion 33, and a pin 34. The first bracket 31 extends downward from the lower portion of the tailgate 9. A first pin hole that opens to the left and right is formed in the first bracket 31. The second bracket 32 ​​is connected to the tail panel 8. A second pin hole 32a that opens to the left and right is formed in the second bracket 32. The storage portion 33 is connected to the first bracket 31 at a position above the first pin hole 31a. The pin 34 is configured to be freely insertable and removable in the first pin hole 31a and the second pin hole 32a, and is also configured to be freely insertable and removable in the storage portion 33. According to the above configuration, the storage portion 33 is provided near the first pin hole 31a and the second pin hole 32a, and the pin 34 can be easily inserted into and removed from the storage portion 33.

[0041] According to this embodiment, the storage portion 33 is disposed so as to be spaced apart from the tailgate 9 by approximately 12 mm. This makes it easy to insert a welding torch between the tailgate 9 and the storage portion 33 when performing welding work to join the tailgate 9 and the first bracket 31. This makes it easy to perform the welding work.

[0042] When the tailgate 9 is opened upward, the tailgate 9 is supported by the lower hinge 30. Therefore, when the tailgate 9 is opened upward, a load is applied to a joint 37 between the first bracket 31 and the tailgate 9. To ensure the strength of the joint 37, it is preferable that at least a portion of the outer periphery of the upper surface of the first bracket 31 that extends in the front-to-rear direction is welded to the underside of the tailgate 9. According to this embodiment, the upper part of the first bracket 31 is welded to the lower part of the tailgate 9 all around. This ensures sufficient strength of the joint 37 between the first bracket 31 and the tailgate 9.

[0043] In this embodiment, the diameter of the pin 34 is 16 mm, and the inner diameter of the storage section 33 is 17.1 mm. Therefore, in this embodiment, the inner diameter of the storage section 33 is approximately 1.06 times the diameter of the pin 34. This allows the storage section 33 to be made as small as possible, while also allowing the pin 34 to be inserted and removed smoothly from the storage section.

[0044] According to this embodiment, the dump truck 1 is provided with an imaging device 40 that captures an image of the area behind the loading platform 4. This allows the driver to check the situation behind the vehicle.

[0045] According to this embodiment, the imaging device 40 is attached to the center of the tail panel 8 in the vehicle width direction, and the lower hinge 30 is disposed further outward in the vehicle width direction than the imaging device 40. This allows the imaging device 40 to capture an image of the rear of the cargo bed 4 evenly across the vehicle width. An image suitable for the driver to check the rear of the vehicle is obtained.

[0046] Although one embodiment of the present invention has been described above, the embodiment is merely an example, and various other embodiments are possible.

[0047] The positional relationship between the lower hinge 30 and the automatic locking mechanism 20 in the vehicle width direction is not limited to that in the above embodiment. For example, the lower hinge 30 may be disposed on the outer side of the automatic locking mechanism 20 in the vehicle width direction.

[0048] In the above embodiment, two lower hinges 30 are provided, but the number of lower hinges 30 is not limited to this. The number of lower hinges 30 may be one, or three or more.

[0049] In the above embodiment, the dump truck 1 is provided with the automatic locking mechanism 20, but the automatic locking mechanism 20 is not necessarily required. The dump truck 1 does not have to be provided with the automatic locking mechanism 20. For example, a configuration may be adopted in which a lower hinge 30 is provided in place of the automatic locking mechanism 20 in the position where the automatic locking mechanism 20 of the above embodiment is disposed. In other words, the dump truck 1 may be configured not to be provided with the automatic locking mechanism 20, but to be provided with four lower hinges 30.

[0050] The dimensions of the lower hinge 30 in the above embodiment are merely examples and are not limited to the dimensions of the above embodiment. In the above embodiment, the diameter of the first pin hole 31a is equal to the diameter of the second pin hole 32a, but the diameters of the first pin hole 31a and the second pin hole 32a may be different from each other. Furthermore, the diameter of the first pin hole 31a and the inner diameter of the storage section 33 may be different from each other, and the diameter of the second pin hole 32a and the inner diameter of the storage section 33 may be different from each other.

[0051] In the above embodiment, the imaging device 40 is attached to the tail panel 8, but the location where the imaging device 40 is attached is not limited to this. For example, the imaging device 40 may be attached to the chassis 2 and disposed below the tail panel 8.

[0052] In the above embodiment, the dump truck 1 is a vehicle with a maximum load weight of approximately 2 tons, but the maximum load weight of the dump truck 1 is not particularly limited. The maximum load weight may be, for example, 4 tons or 10 tons. Note that, since the dimensions and shapes of the bed 4 and the tailgate 9 may be appropriately changed from those in the above embodiment in accordance with a change in the maximum load weight, the number, arrangement, dimensions, etc. of the lower hinges 30 may also be appropriately changed. [Explanation of symbols]

[0053] 1 dump truck 2 chassis 4 Cargo bed 8 Tail Panel 9. Tailgate 10 Top Hinge 30 Lower hinge 31 First Bracket 31a First pinhole 32 Second Bracket 32a Second pin hole 33 Storage area 34-pin 40 Imaging device

Claims

1. The chassis and a loading platform disposed on top of the chassis and having a tail panel; a tailgate provided at a rear portion of the cargo bed, at least a portion of which is positioned above the tail panel; an upper hinge provided at an upper portion of the tailgate for rotatably locking the tailgate to the cargo bed; a lower hinge provided on a lower portion of the tailgate and the tail panel, for rotatably locking the tailgate to the cargo bed; The lower hinge is a pair of left and right first brackets each having a first pin hole that opens to the left and right and extending downward from a lower portion of the tailgate; a pair of left and right second brackets each having a second pin hole opened to the left and right and connected to a rear portion of the tail panel; a cylindrical storage portion connected to the first bracket at a position above the first pin hole and extending in the left and right directions; a pin configured to be freely insertable and removable in the first pin hole and the second pin hole and to be freely insertable and removable in the storage portion; Equipped with The tailgate is configured so that when the pin is inserted into the storage portion, it can rotate from below to above by the upper hinge, and when the pin is inserted into the first pin hole and the second pin hole, it can rotate from above to below with the pin as a rotation axis.

2. The dump truck according to claim 1, wherein the storage section is disposed so as to be spaced downward from the tailgate by a distance of 10 mm or more and 50 mm or less.

3. The dump truck according to claim 1 , wherein a portion of an outer periphery of an upper surface of the first bracket that extends in the front-rear direction is welded to a lower portion of the tailgate.

4. The dump truck according to claim 3 , wherein an upper portion of the first bracket is welded to a lower portion of the tailgate along a full periphery thereof.

5. The dump truck according to claim 1 , wherein an inner diameter of the storage portion is 1.05 to 1.1 times the diameter of the pin.

6. The dump truck according to claim 1 , further comprising an imaging device for imaging an area behind the loading platform.

7. the imaging device is attached to a center portion of the tail panel in a vehicle width direction, The dump truck according to claim 6 , wherein the lower hinge is disposed outward in a vehicle width direction relative to the imaging device.

Images