Freight vehicle

Abstract

To provide a freight vehicle in which foreign matter is less likely to accumulate on the bumper roller guide part.SOLUTION: A guide protection member 800 is provided on an outer side in a vehicle width direction of a vertical joist 103, which is a bumper roller guide part. Specifically, the guide protection member 800 is a rectangular rubber plate that is long in a vehicle longitude direction, and is fixed to the vertical joist 103 so as to cover a range where a bumper roller 740 runs. Only an upper portion of the guide protection member 800 is fixed to the vertical joist 103, with the entire thereof being in a hanging state. When a posture of a loading platform 102 is changed, a second bumper stay 720 is displaced relative to the vertical joist 103 while deforming a lower portion of the cover member in a manner of lifting up the lower portion.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a freight vehicle whose bed position can be changed between a stored position in which the bed is placed on a chassis frame and a ground-contact position in which the bed is placed on the ground. [Background technology]

[0002] Some freight trucks for transporting vehicles are configured to be able to change their position between a storage position in which the loading platform is placed on the chassis frame and a grounded position in which the loading platform is lowered while projecting out to the rear of the vehicle, with part of it touching the ground, as disclosed in Patent Document 1, for example. Because the rear end of the cargo bed of such trucks is located away from the rear end of the chassis frame, an intrusion prevention device (hereafter referred to as the rear bumper) is placed at a designated position behind the chassis frame to comply with vehicle safety standards.

[0003] On the other hand, when the loading platform is in a grounded position, it is desirable that the loading platform and the ground be as parallel as possible because if the angle between the loading platform and the ground is large, there is a risk that the front of the vehicle will come into contact with the loading platform when loading the vehicle onto the loading platform. Therefore, such trucks must be equipped with a rear bumper, but the rear bumper becomes an obstacle when trying to make the angle of the truck when in a grounded position closer to parallel to the ground.

[0004] For this reason, the truck disclosed in Patent Document 1 has a rear bumper supported by a first stay supported on the rear portion of a guide frame fixed to the chassis frame and a second bumper stay hanging down from a roller guide fixed to the underside of the cargo bed. With this structure, when the cargo bed assumes a ground contact position, the first stay swings downward around the support portion of the chassis frame as an axis, and the second bumper stay also swings so as to fall toward the rear of the vehicle. In other words, the distance between the bumper and the cargo bed decreases until they finally contact the ground, and at the same time, the distance between the bumper and the cargo bed also decreases until they finally come into contact, displacing the cargo bed to an angle close to parallel to the ground. To enable such movement of the second bumper stay, a roller is provided at the upper end of the second bumper stay, and the roller runs in a roller guide portion in accordance with the swinging of the second bumper stay.

[0005] The roller guides are elongated members with a U-shaped cross section, and are arranged in pairs parallel to each other with their openings facing outward in the vehicle width direction. This arrangement is intended to ensure space in the center of the vehicle width direction so that mechanisms for suppressing positional changes of the rear gates provided at the rear of the loading platform when the platform is closed can be concentrated under the platform. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2023-132230 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the freight vehicle disclosed in Patent Document 1, the open portion of the roller guide portion faces outward, making it easy for foreign matter to enter the roller guide surface, which is a problem particularly in snowy areas.

[0008] When a truck travels through snowy areas, snow can fall onto the roller guideway depending on the wind direction. Regardless of the wind direction, snow can also get into the roller guideway when the front wheels kick up snow while the truck is traveling. Snow accumulated on the roller guide surfaces in this way becomes an obstacle when the rollers are moving, and prevents the platform from smoothly changing its position. Furthermore, if the snow inside the guideway is compacted by the rollers or freezes, it will become harder to freeze than if the snow simply piled up, which not only hinders position changes but also shortens the life of the position change mechanism, including the rollers. Moreover, removing these obstacles requires a great deal of effort.

[0009] In view of the above circumstances, an object of the present invention is to provide a truck in which foreign matter is less likely to accumulate on the bumper roller guide portion. [Means for solving the problem]

[0010] The first invention is a freight vehicle equipped with a loading platform that can change the posture of the vehicle body relative to a chassis frame between a stored posture in which the vehicle body is disposed on the chassis frame and a ground-contact posture in which the loading platform projects rearward from the vehicle body and is disposed on the ground, the freight vehicle comprising: a pair of first bumper stays that are elongated members whose length extends along the longitudinal direction of the vehicle and whose front ends are supported by the rear ends of the chassis frame so as to be swingable around an axis that extends along the width direction of the vehicle, and are provided on the right and left sides of the vehicle; a rear bumper that extends along the width direction of the vehicle and is fixed across the rear ends of the first bumper stays on the right and left sides of the vehicle; a pair of bumper roller guides that are elongated members whose cross section is approximately U-shaped, and are fixed to the right and left sides of the loading platform below the loading platform so that their length extends along the longitudinal direction of the vehicle and their openings face outward in the width direction of the vehicle; and a pair of bumper roller guides that are arranged inside the bumper roller guides and are provided on the front of the vehicle. a bumper roller that can travel rearward; and a second bumper stay whose upper end is connected to the bumper roller so as to be swingable around an axis along the vehicle width direction and whose lower end is connected to the upper part of the rear bumper so as to be swingable around an axis along the vehicle width direction, wherein when the cargo bed changes position between the stored position and the ground contact position, the bumper roller guide portion moves relative to the rear bumper together with the cargo bed, causing the bumper roller to travel inside the bumper roller guide portion and change its position within the bumper roller guide portion, such that when the cargo bed is in the stored position, the bumper roller is located at the rear of the bumper roller guide portion and when the bumper roller is in the ground contact position, the bumper roller is located at the front of the bumper roller guide portion, and the left and right bumper roller guide portions are each equipped with a guide portion protection member that covers at least the range of its opening through which the bumper roller travels, and only the upper part is fixed to the bumper roller guide portion and is configured to be deformable.

[0011] A second invention is a freight vehicle characterized in that the guide portion protection member according to the first invention is fixed so that its rear end opens toward the rear of the vehicle.

[0012] The third invention is a freight vehicle characterized in that a cover member is fixed to the upper end of the second bumper stay described in the first or second invention to suppress wear of the guide portion protection member. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a truck in which foreign matter is less likely to accumulate on the bumper roller guide portion. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view of a truck according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing the structure of a loading platform mounted on the freight vehicle shown in FIG. [Figure 3] FIG. 2 is a diagram showing the structure of a loading platform mounted on the freight vehicle shown in FIG. [Figure 4] 4A and 4B are a side view and a bottom view, respectively, of the vertical joist shown in FIG. 3. [Figure 5] FIG. 4 is a rear view of the cargo bed and bumper stay shown in FIG. 3. [Figure 6] 10A and 10B are diagrams illustrating the operation of the loading platform when changing its posture. [Figure 7] 10A and 10B are diagrams illustrating the operation of the loading platform when changing its posture. [Figure 8] 8A is a side view showing the positions of the guide portion protection member and the second bumper stay when the loading platform is in the position shown in FIG. 7, and FIG. 8B is a cross-sectional view of the vertical joist and the guide portion protection member taken along line AA. [Figure 9] FIG. 10 is a diagram showing the posture of the loading platform when in a ground contact posture. [Figure 10] FIG. 10 is an enlarged view of a portion indicated by the symbol I in FIG. [Figure 11] 10A and 10B are views showing a second bumper stay and a cover member according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The truck according to the present invention will be described below with reference to the drawings. It should be noted that the drawings are schematic. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual relationship between thickness and planar dimensions, and the drawings may also include portions where the relationship between dimensions and ratios differ. Furthermore, the embodiments shown below are merely examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components.

[0016] In the following explanations and drawings, the direction in which the freight vehicle 100 moves forward (the direction in which it travels with the shift selected in D range, etc.) may be referred to as "forward." Similarly, in the following explanations and drawings, the direction in which the freight vehicle 100 moves backward (the direction in which it travels with the shift selected in R range) may be referred to as "rearward." In the following explanations and drawings, the left hand side when the driver of the truck 100 is sitting in the driver's seat will be referred to as the "left side," and the right hand side when the driver is sitting in the driver's seat will be referred to as the "right side." Therefore, in the following explanations and drawings, expressions such as "front side of the vehicle," "rear side of the vehicle," "right side in the vehicle width direction," and "left side in the vehicle width direction" may be used in accordance with these definitions.

[0017] <Outline of freight vehicle configuration> The configuration of the freight vehicle 100 will be outlined with reference to FIGS. The freight vehicle 100 is a truck equipped with vehicle loading equipment, and includes a bed 102, a chassis frame 200, an inclined frame 300, and a guide frame 400. A rear gate 2 is provided at the rear of the loading platform 102. The chassis frame 200 and the tilt frame 300 are provided with a bed cylinder 500 and a tilt frame cylinder 600, respectively, as actuators for changing the position of the bed 102, the details of which will be described later.

[0018] Furthermore, the freight vehicle 100 is provided with a bumper stay 700 as an intrusion prevention device at the rear of the chassis frame 200. The detailed structure of the bumper stay 700 will be described later, but it is provided to position the rear bumper 730 at the position at the rear of the vehicle as defined by the safety standards.

[0019] In the storage position, which is the position of the truck 100 when traveling, the positional relationship of each component is as follows: the inclined frame 300 is located above the guide frame 400, and the loading platform 102 is located above that. Hereinafter, unless otherwise specified, the truck 100 will be described as being in the storage position.

[0020] <Cargo bed> The structure of the loading platform 102 will be described with reference to FIGS. The carrier 102 is positioned on the tilting frame 300 in the stowed position shown in FIG. The loading platform 102 also includes a rear gate 2, a floor board 106, a front roller 102a, a rear roller 102b, and a vertical joist 103. The floor board 106 is a board on which a vehicle is loaded.

[0021] The front rollers 102a are cylindrically shaped and are attached to the underside of the floorboard 106 (the lower surface in Figure 2), one on each side in the vehicle width direction, so as to be rotatable around an axis along the vehicle width direction using front brackets 102c, with a part of each roller protruding downward beyond the front brackets 102c. The rear rollers 102b are cylindrically shaped and are attached to the underside of the floor plate 106, one on the right rear side of the vehicle and one on the left rear side of the vehicle, so that they can rotate around an axis along the vehicle width direction, and a portion of each roller protrudes downward and rearward from the floor plate 106.

[0022] The vertical joists 103 are bumper roller guides for guiding the bumper rollers 740 (described later) so that they can roll along the vehicle longitudinal direction, and are formed as a pair of rods whose length is along the vehicle longitudinal direction, and are fixed to the underside of the floor panel 106. The vertical joists 103 have a substantially U-shaped cross section, and are fixed with their openings facing outward in the vehicle width direction.

[0023] <Post-incitement> As shown in Fig. 1, the rear gate 2 is provided at the rear of the loading platform 102 and is a plate that also serves as a ramp when loading cargo onto the loading platform 102. The rear gate 2 is attached to the rear end of the loading platform 102 in a state in which it can be swung relative to the loading platform 102. Furthermore, by swung relative to the loading platform 102, the position of the rear gate 2 relative to the loading platform 102 can be changed between a closed position and an open position.

[0024] The closed position is a position perpendicular to the direction in which the freight vehicle 100 travels, as shown in FIG. 1, and is the position of the rear tailgate 2 when the freight vehicle 100 is traveling. Although not shown in the drawing, the open position is a position in which the upper end of the rear gate 2 is laid down facing the rear of the vehicle. Specifically, this is a posture that is horizontal with respect to the direction in which the truck 100 travels, and when cargo is loaded onto the loading platform 102, it tilts together with the loading platform 102 to form a slope between it and the ground G.

[0025] <Inclined frame> The structure of the inclined frame 300 will be described with reference to FIG. The main body of the inclined frame 300 is a frame-like structure in which two members, each with a roughly U-shaped cross section and elongated along the fore-and-aft direction of the vehicle, are arranged on the right and left sides of the vehicle with their openings facing outward in the vehicle width direction, and are fixed together by frame connection parts 308 and connecting members (not shown) that connect the rear portions of the vehicle together. The inclined frame 300 includes a first lower surface roller 304 and a second lower surface roller 305 in addition to the main body portion.

[0026] The interior of the main body of the inclined frame 300 is a running surface on which the front rollers 102a of the loading platform 102 run. In addition, an inclined portion 302 that increases in height toward the vehicle rear is formed on the vehicle front side of the main body of the inclined frame 300 from about one-tenth of the total length to about three-tenths of the total length. Therefore, the vehicle front portion 301 and the vehicle rear portion 303 that are sandwiched between the inclined portion are substantially parallel in the length direction, but the vehicle rear portion 303 is located at a higher position.

[0027] The first lower surface roller 304 is formed in a cylindrical shape and is rotatably attached to the underside of the central longitudinal portion of the entire inclined frame 300 at the rear of the vehicle using a first lower surface bracket 306 around an axis of rotation along the vehicle width direction, with a portion of it protruding downward beyond the first lower surface bracket 306. The second lower surface roller 305 is formed in a cylindrical shape and is mounted on the rear side of the vehicle from the first lower surface roller 304 using a second lower surface bracket 307 so as to be rotatable around an axis along the vehicle width direction, with a portion of it protruding downward from the second lower surface bracket 307.

[0028] With the above structure, when the loading platform 102 is in the storage position, the inclined frame 300 is positioned between the guide frame 400 and the loading platform 102, and is formed so that it can be inclined relative to the guide frame 400 and the loading platform 102 and can be displaced relative to the vehicle in the fore-and-aft direction.

[0029] <Guide frame> The structure of the guide frame 400 will be described with reference to FIGS. The guide frame 400 is fixed to the chassis frame 200 and is located between the chassis frame 200 and the loading platform 102 when in the stored position. The guide frame 400 also includes a horizontal guide portion 401 , an inclined guide portion 402 , a guide roller 403 , and a holding hook 404 .

[0030] The horizontal guide portions 401 are members that are elongated along the vehicle longitudinal direction and have a substantially U-shaped cross section, and one is disposed on each of the right and left sides of the vehicle with the openings facing the center in the vehicle width direction. The inside of the guide lane 410 is a running surface on which the first lower surface roller 304 and the second lower surface roller 305 of the inclined frame 300 run. The inclined guide portion 402 is continuous with the rear end of the horizontal guide portion 401, and is inclined downward as it approaches the rear of the vehicle in a side view.

[0031] The guide roller 403 is formed in a cylindrical shape, and is disposed at the rear end of the horizontal guide portion 401, and is attached so as to be rotatable about an axis along the vehicle width direction. Note that a portion of the guide roller 403 protrudes upward beyond the horizontal guide portion 401.

[0032] The holding hook 404 is disposed at the front end of the horizontal guide portion 401 (the left end portion in FIG. 2), and protrudes upward from the horizontal guide portion 401. Furthermore, the retaining hook 404 is formed in a shape that allows it to catch a lock pin (not shown) attached to the loading platform 102.

[0033] <Cargo bed cylinder> The loading platform cylinder 500 shown in Figure 2 is a hydraulic cylinder whose one end is supported on the loading platform 102 so as to be swingable around an axis along the vehicle width direction, and whose other end is supported on the inclined frame 300 so as to be swingable around an axis along the vehicle width direction. When the posture of the loading platform 102 is changed from the stored posture to the grounded posture, the loading platform cylinder 500 is actuated to move the loading platform 102 along the inclined frame 300.

[0034] <Tilt frame cylinder> The tilting frame cylinder 600 shown in FIG. 2 is a hydraulic cylinder having one end supported by the tilting frame 300 so as to be swingable around an axis along the vehicle width direction, and the other end supported by the guide frame 400 so as to be swingable around an axis along the vehicle width direction. When the posture of the loading platform 102 is to be changed, the tilt frame cylinder 600 is actuated to move the loading platform 102 and the tilt frame 300 along the guide frame 400 .

[0035] As described above, the posture of the loading platform 102 relative to the chassis frame 200 can be changed between a stored posture and a ground contact posture. The ground contact posture is a posture in which the loading platform 102 shown in FIG. 9 is moved to the rear of the truck 100 and placed on the ground G.

[0036] <Bumpaste> The structure of the bumper stay 700 will be described with reference to FIGS. The bumper stay 700 includes a first bumper stay 710 and a second bumper stay 720 . The first bumper stay 710 is formed using a pair of square cylindrical members, and is arranged so that its length is parallel to the fore-and-aft direction of the truck 100 when the loading platform 102 is in the stored position. The front end of first bumper stay 710 is supported by guide frame 400 so as to be swingable about an axis along the vehicle width direction, and rear bumper 730 is fixed to the rear end. The rear bumper 730 is a component that is disposed at a position required by regulations of the freight vehicle 100 (rear of the guide frame 400).

[0037] The second bumper stay 720 is formed using a pair of square tubular members, and is arranged so that its length is parallel to the vertical direction when the loading platform 102 is in the stored position. The lower end of second bumper stay 720 is attached to the upper part of rear bumper 730 so as to be swingable about an axis along the vehicle width direction.

[0038] A pair of bumper rollers 740 are attached rotatably about an axis along the vehicle width direction to the upper end (the upper end in Fig. 2) of second bumper stay 720. Also, as shown in detail in Fig. 8, an inverted U-shaped cover member 721, with rounded corners between the upper and front surfaces and the upper and rear surfaces, is fixed to the upper end of second bumper stay 720 so as to cover its front, upper, and rear surfaces. The cover member 721 is formed into the above-mentioned shape by bending a plate-shaped member. This shape also fits the upper end portion of the second bumper stay 720.

[0039] As shown in FIG. 5, the pair of bumper rollers 740 face each other in the width direction of the truck 100. The bumper roller 740 is formed in a cylindrical shape, a part of which protrudes upward beyond the second bumper stay 720, and is located inside the vertical joist 103.

[0040] <Guide part protection member> The guide portion protection member 800 will be described with reference to FIGS. The guide portion protection member 800 is provided on the outer side of the vertical joist 103 in the vehicle width direction. Specifically, the guide portion protection member 800 is a rectangular rubber plate material that is long in the front-rear direction of the vehicle, and is fixed to the vertical joist 103 so as to cover the area where the bumper roller 740 runs. Only the upper portion of the guide portion protection member 800 is fixed to the vertical joist 103, and the entire member hangs down.

[0041] Furthermore, the rear end of the guide portion protection member 800 is fixed in a shape that opens rearward as shown in FIG. 4(b). Specifically, an inclined portion 801 is formed such that its rear end portion is positioned more outward in the vehicle width direction than the outer end face of second bumper stay 720 in the vehicle width direction.

[0042] The positional relationship between the vertical joists 103, the bumper stay 700, and the guide portion protection member 800 when viewed from the rear of the vehicle is as shown in FIG. A pair of vertical joists 103 are arranged on the right and left sides of the vehicle with their openings facing outward in the vehicle width direction, and the upper part of guide part protection member 800 is fixed so as to cover the opening. Bumper roller 740 is arranged inside vertical joists 103, and inclined part 801 of guide part protection member 800 is located outward in the vehicle width direction from the outer surface of second bumper stay 720 in the vehicle width direction.

[0043] <Operation / effect> 3 to 10, the operation of the loading platform 102 and the bumper stay 700 when the posture of the loading platform 102 changes, and the function of the guide portion protection member 800 will be described using the case of loading a vehicle as an example. When the rear gate 2 is in the closed position and the loading platform 102 is in the stored position as shown in Figure 3, the bumper roller 740 is located at the rear end of the vertical joist 103, and the second bumper stay 720 is located at the rear end of the vertical joist 103, and is not in contact with the guide portion protection member 800, as shown in Figure 4.

[0044] When the vehicle starts to change position from the state shown in FIG. 3, first, only the bed cylinder 500 operates, and as shown in FIG. 6, the bed 102 moves rearward along the inclined frame 300 while the inclined frame 300 remains stationary. At this time, the front roller 102a, which was resting on the front portion 301 of the vehicle in the state shown in FIG. 2, moves to the inclined portion 302. As a result, the bed 102 is inclined so that its rear end is lower than its front end. At this time, the second bumper stay 720 comes into contact with the inclined portion 801 of the guide portion protection member 800. As a result, the cover member 721 deforms the lower portion of the guide portion protection member 800 so as to lift it up, and is displaced relative to the vertical joist 103. Furthermore, when the loading platform 102 moves rearward along the inclined frame 300, the rear end of the first bumper stay 710 tilts lower as the loading platform 102 moves, and the upper end of the second bumper stay 720 tilts toward the rear of the vehicle.

[0045] When the bed cylinder 500 is operated to move the bed 102 rearward from the state shown in Fig. 6, the front roller 102a that was resting on the inclined portion 302 moves toward the vehicle rear portion 303, as shown in Fig. 7. As a result, the bed 102 becomes even more tilted so that its rear end is lower. As the bed 102 continues to move, the rear end of the first bumper stay 710 tilts even lower, and the upper end of the second bumper stay 720 tilts rearward. At this time, as shown in FIG. 8, the second bumper stay 720 is displaced relative to the vertical joist 103 with the guide portion protection member 800 turned up from the bottom.

[0046] 7, when the loading platform cylinder 500 is operated to the stroke end and then the tilting frame cylinder 600 is actuated, the tilting frame 300 moves rearward along the guide frame 400 together with the loading platform 102. At the same time, the tilting frame 300 assumes an inclined position so that the rear end is lower than the front end.

[0047] Furthermore, by operating the tilt frame cylinder 600 to its stroke end to move the loading platform 102 and the tilt frame 300 rearward, the rear end of the tilt frame 300 and the rear bumper 730 are brought into contact with the ground G, as shown in FIG. 9 . At this time, as shown in FIG. 10, the upper end of the second bumper stay 720 is tilted backward to an angle approximately parallel to the ground, but the guide portion protection member 800 remains rolled up.

[0048] Next, the worker swings the rear gate 2 from the closed position to the open position. After that, the vehicle is loaded onto the loading platform 102 from the rear gate 2 by self-propelling or using a winch. Then, the worker switches the rear gate 2 from the open position to the closed position.

[0049] After the vehicle is loaded onto the loading platform 102 and the rear gate 2 is set to the closed position, the procedure is reversed to set the loading platform 102 to the stored position. That is, first, the tilt frame cylinder 600 is operated to move the tilt frame 300 forward together with the loading platform 102. Then, the tilt frame 300 is moved forward together with the loading platform 102, and after the position of the tilt frame 300 relative to the guide frame 400 is fixed, the loading platform 102 is moved forward along the tilt frame 300, and when the loading platform 102 is in the stored position as shown in FIG. 2, the loading platform cylinder 500 is stopped. Through the above operations, the vehicle is loaded onto the loading platform 102.

[0050] <Effects> By fixing the guide part protection member 800, it is possible to prevent foreign matter such as snow from entering the interior of the vertical joist 103, which is the roller guide part. That is, because the opening of the vertical joist 103 is covered by the guide part protection member 800, snow cannot enter the interior of the vertical joist 103 even when it is blown or kicked up by the rotation of the tires.

[0051] Furthermore, because the guide protection member 800 is made of a deformable material such as rubber, a portion of it is rolled up by the action of the second bumper stay 720 only when the position of the loading platform 102 is changed, while the other portion remains covering the opening. Therefore, it is possible to prevent foreign objects from entering even when the position is changed.

[0052] The time that the truck 100 is in the stored position is longer than the time that it is in the ground-contact position. During the stored position, the second bumper stay 720 is stopped at the rear end of the vertical joist 103. Therefore, by forming an inclined portion 801 at the rear end of the guide portion protection member 800, the guide portion protection member 800 does not become rolled up while stopped in the storage position, thereby suppressing deformation and deterioration of the member.

[0053] By providing cover member 721 at the upper end of second bumper stay 720, it is possible to prevent direct contact between second bumper stay 720 and guide portion protection member 800. In particular, because the corners of cover member 721 are rounded, even if it comes into contact with guide portion protection member 800, it is unlikely to wear out guide portion protection member 800. Furthermore, even if a gap is formed between second bumper stay 720 and bumper roller 740, cover member 721 covers the gap, preventing guide portion protection member 800 from getting caught in the gap. As described above, by providing cover member 721 on second bumper stay 720, it is possible to extend the life of guide portion protection member 800. Furthermore, since the cover member 721 is formed into a shape that conforms to the upper end of the second bumper stay 720 by bending sheet metal, no processing is required to form a fixing portion of the cover member 721 on the second bumper stay 720 side, which makes it possible to suppress increases in manufacturing costs.

[0054] Furthermore, cover member 721 has a shape that is line-symmetrical with respect to second bumper stay 720, but in this embodiment, only the portion of cover member 721 on the vehicle front side comes into contact with guide portion protection member 800. Therefore, cover member 721 does not necessarily have to have a shape that covers the vehicle rear side surface of second bumper stay 720, but by making it have a line-symmetrical shape as shown in this embodiment, one type of part shape can be used to cover both the left and right second bumper stays 720, which makes it possible to reduce manufacturing costs.

[0055] <Modification> A modified example will be described with reference to FIG. The second bumper stay 720 according to the modified example is provided with a grease nipple 741 that is coaxial with the bumper roller 740 and protrudes outward in the vehicle width direction. The grease nipple 741 is provided to supply grease around the rotation axis of the bumper roller 740. When such a grease nipple 741 is provided, the cover member 721 is fixed around the grease nipple 741 so that the tip of the grease nipple 741 does not come into contact with the guide portion protection member 800. Specifically, when viewed from the vehicle front-rear direction, the outer end of the cover member 721 in the vehicle width direction is positioned so as to substantially overlap the tip of the grease nipple 741. However, since the guide portion protection member 800 deforms into the shape shown in FIG. 8( b) while the cover member 721 is rolling up the guide portion protection member 800, this positional relationship does not need to be strictly established. It is sufficient that the grease nipple 741 does not come into contact with the inclined portion 801 and that the rolled-up guide portion protection member 800 does not come into contact with the inclined portion 801 even when it hangs down. Therefore, in this modified example, the outer end of the cover member 721 in the vehicle width direction is positioned more inward in the vehicle width direction than the tip of the grease nipple 741.

[0056] In the embodiment, cover member 721 is an inverted U-shaped member, but the application of cover member 721 to the present invention is not limited to this shape. For example, it may be a hemispherical member that covers the upper end of second bumper stay 720, or any other shape that covers the corners of the upper end of second bumper stay 720 and protruding parts such as grease nipples so as to prevent them from coming into direct contact with guide part protection member 800.

[0057] Furthermore, the material of the guide portion protection member 800 is not necessarily limited to rubber. For example, it may be configured by connecting a number of long, thin plate-shaped resin members, which are rolled up by the second bumper stay 720 when the position is changed.

[0058] In the embodiment, the inclined portion 801 is formed at the rear end of the guide portion protection member 800, but in the application of the present invention, it is not necessarily required to form the inclined portion 801. Even if the inclined portion 801 is not formed, the opening portion of the vertical joist 103 is covered by the guide portion protection member 800, so that it is possible to prevent the intrusion of foreign matter. [Explanation of symbols]

[0059] 2...rear gate, 100...lorry, 103...vertical joist, 200...chassis frame, 300...inclined frame, 400...guide frame, 500...bed cylinder, 600...inclined frame cylinder, 700...bumper stay, 710...first bumper stay, 720...second bumper stay, 721...cover member, 730...rear bumper, 740...bumper roller, 741...grease nipple, 800...guide portion protection member, 801...inclined portion

Claims

1. A freight vehicle having a loading platform that can change the posture of the vehicle body relative to a chassis frame between a stored posture in which the vehicle body is disposed on the chassis frame and a ground-contact posture in which the vehicle body projects rearward from the vehicle body and is disposed on the ground, a pair of first bumper stays provided on the right and left sides of the vehicle, the first bumper stays being elongated members whose length direction is along the vehicle front-rear direction and whose front ends are supported by the rear end of the chassis frame so as to be swingable around an axis along the vehicle width direction; a rear bumper whose length direction is along the vehicle width direction and which is fixed across rear ends of the first bumper stays on the vehicle right and left sides; a pair of bumper roller guides each of which is an elongated member having a substantially U-shaped cross section, and which is fixed to the right and left sides of the vehicle at a lower portion of the loading platform so that its length is along the front-rear direction of the vehicle and its opening side faces outward in the vehicle width direction; a bumper roller disposed inside the bumper roller guide portion and capable of traveling along the front-rear direction of the vehicle; a second bumper stay having an upper end connected to the bumper roller so as to be swingable about an axis along the vehicle width direction and a lower end connected to an upper portion of the rear bumper so as to be swingable about an axis along the vehicle width direction, When the loading platform changes position between the stored position and the ground contact position, the bumper roller guide portion moves relative to the rear bumper together with the loading platform, and the bumper roller travels inside the bumper roller guide portion, changing its position in the bumper roller guide portion, being located at the rear of the bumper roller guide portion in the stored position and being located at the front of the bumper roller guide portion in the ground contact position, A freight vehicle characterized in that the left and right bumper roller guide parts are equipped with guide part protection members that cover at least the area of ​​their opening where the bumper rollers run, and only the upper part is fixed to the bumper roller guide parts and is configured to be deformable.

2. 2. The truck according to claim 1, wherein the guide portion protection member is fixed so that its rear end opens toward the rear of the vehicle.

3. 3. The truck according to claim 1, wherein a cover member is fixed to an upper end of the second bumper stay to suppress wear of the guide portion protection member.

Images