JP3803542B2 - Rear bumper device in a vehicle with a cargo receiving platform lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, in the rear of the chassis frame equipped with packing boxes, a rear bumper device in receiving platform lifting device with a vehicle which is provided at a distance from each other in the lateral direction of the vehicle body a pair of right and left lifting device for raising and lowering the receiving platform, The present invention relates to an apparatus having a central rear bumper body inside the pair of left and right lifting devices .
[0002]
[Prior art]
Conventionally, in the vehicle with the load receiving platform elevating device, the lifting device for the load receiving platform can be moved up and down on the support bracket fixed to the rear portion of the chassis frame, and the central rear bumper body is provided on the column separately fixed to the chassis frame. Are known (for example, see Utility Model Registration No. 2567089).
[0003]
[Problems to be solved by the invention]
However, such a conventional rear bumper device, since so as to support the central portion rear bumper body to the rear end of the strut is fixed separately from the chassis frame to the support member for supporting the receiving platform of the lifting device, a central portion rear bumper body A dedicated support member is required to support, and the number of parts of the support member that supports the lifting device and the central rear bumper body provided on the chassis frame as a whole increases, leading to high costs, and further, the central rear bumper A support member such as a stay for supporting the main body is extended from the chassis frame for a relatively long time, so that the support rigidity is lowered and the function as the rear bumper device is lowered. .
[0004]
The present invention has been made in view of such circumstances, by utilizing the connection bracket for supporting the receiving platform of the lifting device, so as to support the central portion rear bumper body, and to be able to solve all the above problems, It is an object of the present invention to provide a rear bumper device in a vehicle with a novel cargo receiving platform lifting device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a pair of left and right elevating devices for elevating and lowering the load receiving table are provided at intervals in the left and right direction of the vehicle body at the rear portion of the chassis frame on which the cargo box is mounted. A rear bumper device in a vehicle with a load receiving platform lifting device, wherein a central rear bumper body is provided inside a pair of left and right lifting devices, and a connection extending in the front-rear direction along the chassis frame at the rear portion of the chassis frame A bracket is fixed, and the central rear bumper main body is fixed to the rear part of the connecting bracket, while the lifting device is supported on the front part of the connecting bracket through a cross member extending in the left-right direction so as to be movable up and down. and to have, according to this aspect, to attach the central portion rear bumper body chassis frame, only the support member is not required By reducing the number of parts becomes possible to simplify the structure, it is possible to achieve a significant cost reduction, Moreover, a special support member for supporting the central portion rear bumper body outward from the chassis frame There is no need to extend it for a long time, and the central rear bumper body is supported at the rear of the bracket by using a relatively rigid connection bracket that is fixed to the rear of the chassis frame and supports the lifting device of the load receiving table at the front. Therefore, the support rigidity can be significantly increased.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.
[0007]
FIG. 1 is a side view of a lorry equipped with a load receiving platform lifting device equipped with a rear bumper device of the present invention, and FIG. 2 is a rear view of the lorry as viewed in the direction of the arrow 2 in FIG.
[0008]
1 and 2, a covered cargo box V is mounted on a chassis frame F of a freight vehicle, and a support frame 1 is fixedly supported at a rear portion of the chassis frame F, and an elevator device is mounted on the support frame 1. A load receiving table (tailgate) G is supported via E so as to be movable up and down. The closed cargo box V has a rear doorway that can be opened and closed by a door-opening door D, and after opening the door, as shown by a chain line in FIG. By lifting and lowering while maintaining the state, it is possible to carry out loading and unloading work between the packing box V and the ground. Further, when the lorry is traveling, the load receiving platform G is held in parallel in an upright state behind the closed closed door D, as indicated by a solid line in FIG.
[0009]
In addition, the said raising / lowering apparatus E and the receiving stand G use a conventionally well-known thing.
[0010]
Next, with reference to FIGS. 1 and 2 and FIGS. 3 to 16 in detail, the structure of the rear bumper device of the lorry with a cargo receiving platform lifting device of the present invention will be described in detail.
[0011]
3 is a plan view taken along line 3-3 in FIG. 4, FIG. 4 is a side view taken along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. Is a sectional view taken along line 6-6 in FIG. 3, FIG. 7 is a sectional view taken along line 7-7 in FIG. 3, FIG. 8 is an exploded perspective view of a support portion of the central rear bumper device, and FIG. 7 is a partially broken side view taken along line 9 of FIG. 7, FIG. 10 is a sectional view taken along line 10-10 in FIG. 7, FIG. 11 is a sectional view taken along line 11-11 in FIG. 7 is a cross-sectional view taken along the line 12-12 in FIG. 7, FIG. 13 is a cross-sectional view taken along the line 13-13 in FIG. 7, FIG. 14 is a cross-sectional view taken along the line 14-14 in FIG. FIG. 16 is a perspective view seen from the front, and FIG. 16 is a perspective view seen from the rear of the rear bumper.
[0012]
The rear bumper device B of this embodiment is of a type that is fixedly supported on a chassis frame F of a lorry, a support frame 1 that is fixedly supported on the rear part of the chassis frame F, and is fixed to the support frame 1. The rear bumper main body 2 and the load receiving table G and its lifting device E need to be lifted and lowered through the rear bumper device B. Therefore, the rear bumper device B includes a central rear bumper device BC and its rear bumper device BC. The left and right rear bumper devices BL and BR are provided with a gap on the left and right. And the raising / lowering apparatus E of the said load receiving stand G can raise / lower these gaps.
[0013]
First, the structure of the central rear bumper device BC will be described.
[0014]
As shown in FIGS. 3 to 6 and FIG. 8, L-shaped front and rear mounting brackets 3 and 4 are welded to the rear portions of the left and right vertical beams F1 of the chassis frame F of the truck. . These mounting brackets 3 and 4 are formed of an L-shaped angle steel material, and a pair of left and right connecting brackets 5 are fixed to the lower surfaces thereof with connecting bolts 6. The left and right connecting brackets 5 are formed of a steel material having a U-shaped cross section, and extend substantially horizontally along the longitudinal direction of the chassis frame F and parallel to each other toward the rear. As shown most clearly in FIG. 8, a cross member 7 extending in a transverse direction across the chassis frame F is welded to the front end of the left and right connecting brackets 5 formed in a bifurcated shape. The cross member 7 includes upper and lower cross members 7u and 7d, both of which are formed by square pipes made of steel. The left and right lower cross members 7d are welded to the left and right ends of the upper cross member 7u. A space 8 for accommodating the spare tire TS is formed between the left and right lower cross members 7d at the center of the upper cross member 7u (see FIGS. 3 and 7).
[0015]
Fixing plates 10 are welded to the rear ends of the left and right connecting brackets 5, respectively. These fixing plates 10 are formed slightly larger than the cross-sectional area of the connecting bracket 5, and a central rear bumper body 2 </ b> C, which will be described in detail later, is fixedly supported on these fixing plates 10 via spacers 11.
[0016]
The front and rear mounting brackets 3 and 4, the connection bracket 5, and the cross member 7 that are provided symmetrically on the left and right of the rear portion of the chassis frame F constitute the support frame 1 of the rear bumper device B. The connecting bracket 5 and the fixing plate 10 constitute a central support frame 1C, and the central rear bumper body 2C is fixedly supported by the support frame 1C.
[0017]
Next, the center rear bumper main body 2C and its mounting structure to the support frame 1C will be described.
[0018]
The central rear bumper main body 2C is integrally formed by extrusion or drawing of an aluminum alloy, and as shown most clearly in FIGS. 15 and 16, is elongated in the left-right direction and has the same cross section. The transverse cross-sectional shape is a laterally trapezoidal shape, and the front surface thereof, that is, the attachment surface 13 to the center support frame 1C, and the rear surface thereof, that is, the collision surface 14 toward the rear of the vehicle, are in the vertical direction. The rear surface 14 is a flat surface parallel to each other, and is formed wider than the front surface 13. The upper surface 15 is formed on a rearwardly inclined surface, and the lower surface 16 is formed on a rearwardly inclined surface. In addition, two upper and lower slits 17u and 17d are formed in the upper and lower portions of the front surface 13, and the slits 17u and 17d are formed on the central rear bumper body 2C, as will be described later. Used to attach to the support frame 1C.
[0019]
As shown most clearly in FIGS. 15 and 16, the hollow interior of the central rear bumper body 2 </ b> C extends over the entire length of the rib group 19, i.e., the middle portion thereof is a V-shaped reinforcing rib 19 a, and the upper and lower portions thereof are Reinforced by plate-like reinforcing ribs 19b and 19c, respectively. The open side end of the V-shaped reinforcing rib 19a is integrally coupled to the front surface 13, and the closed end is integrally coupled to the rear surface 14. The upper and lower plate-like reinforcing ribs 19b and 19c are parallel to the vicinity of the front surface 13, and are integrally coupled between the upper and lower surfaces 15 and 16 and the V-shaped reinforcing rib 19a. In addition, positioning holes 18 are formed in the left and right portions of the upper and lower surfaces 15 and 16, respectively. The left and right positioning holes 18 attach the central rear bumper body 2C to the central supporting frame 1C, as will be described later. It is used for positioning.
[0020]
A cover mounting groove having a C-shaped cross section is formed in the vicinity of the connecting portion of the V-shaped reinforcing rib 19a with the rear surface 14 and in the vicinity of the connecting portion between the upper and lower plate-shaped reinforcing ribs 19b and 19c and the upper and lower surfaces 15 and 16, respectively. 21, 22 and 23 are formed at the same time when the central rear bumper main body 2C is extruded or pultruded, and the cover mounting grooves 21, 22 and 23 have tap screws 24 and side covers 25 as described later. Is fixed. The plurality of cover mounting grooves 21, 22, and 23 partially reinforce the rear bumper body 2C by partially increasing the thickness of the central rear bumper body 2C.
[0021]
Next, a pair of attachment plates 27 is used to attach the central rear bumper body 2C to the central support frame 1C. As shown in FIG. 8, these mounting plates 27 are provided with fixing bolts 28 and mounting holes 29 with weld nuts.
[0022]
In order to attach the central rear bumper body 2C to the central support frame 1C using the pair of mounting plates 28, the pair of mounting plates 27 are raised from the opening end face of the rear bumper main body 2C, and the central rear bumper is passed through the lower slits 17u and 17d. After being inserted into the main body 2C, as shown in FIG. 14, the positioning bolt 30 screwed into the mounting hole 29 with the weld nut of the mounting plate 27 is inserted into the positioning hole 18, and the positioning is performed. As shown in FIG. 13, if the spacer 11 and the fixing plate 10 are sandwiched between the fixing bolts 28 of the pair of mounting plates 27 and screwed together, the central rear bumper body sandwiches the spacer 11 with the fixing plate 10 of the central supporting frame 1C. 2C can be positioned and fixed.
[0023]
The side cover 25 made of synthetic resin is fixed to the left and right opening end faces of the central rear bumper body 2C. The side cover 25 is formed in a trapezoidal shape that is the same as the cross-sectional shape of the central rear bumper main body 2C. After the side cover 25 is put on the opening end surface of the central rear bumper main body 2C, a plurality of tap screws 24 are provided. Through the side cover 25 and screwed into the cover mounting grooves 21, 22, 23 of the rear bumper body 2C, the side cover 25 can be fixed to the left and right opening end surfaces of the rear bumper body 2C. Thus, the side cover 25 can improve the appearance of the rear bumper main body 2C and prevent water such as rain water from entering the inside thereof. In addition, the end cover of the central rear bumper main body 2C can be prevented. Even if a person comes into contact therewith, it does not cause any harm, and the side cover 25 can be easily attached to the central rear bumper body 2C.
[0024]
On the rear surface of the central rear bumper main body 2C, that is, the collision surface 14, a reflecting plate 33 is fixed to make it easier for a subsequent vehicle or the like to be confirmed. In order to fix the reflecting plate 33, two grooves 34, that is, upper and lower V grooves 34u and 34d, which are paired in parallel with the longitudinal direction, are formed on the collision surface 14. When attaching the reflecting plate 33 to the collision surface 14, attachment holes 35 and 36 are formed in the left and right portions of the upper and lower V grooves 34 u and 34 d (note that these attachment holes 35 and 36. Is drilled when the reflector 33 is attached). The upper and lower V grooves 34u and 34d are formed shallow so as not to impair the strength of the central rear bumper body 2C.
[0025]
On the other hand, the reflecting plate 33 is formed in a strip shape smaller than the rear surface 14 of the central rear bumper body 2C, and mounting holes 37 and 38 are formed in the left and right portions of the reflecting plate 33.
[0026]
To attach the reflector 33 to the rear surface of the central rear bumper body 2C, that is, the collision surface 14,
1) The left and right upper mounting holes 37 of the reflector 33 are aligned with the upper V-groove 34u.
[0027]
2) A tap hole 35 is formed in the upper V groove 34u corresponding to the position of the left and right mounting holes 37.
[0028]
3) A tap screw 39 is screwed into the tap hole 35 through the upper mounting hole 37 to fix the upper part of the reflecting plate 33 to the collision surface 14.
[0029]
4) A tap hole 36 is formed in the lower V-groove 34d corresponding to the left and right lower mounting holes 38 of the reflecting plate 33.
[0030]
5) A tap screw 39 is screwed into the tap hole 36 through the lower mounting hole 38 to fix the lower part of the reflecting plate 33 to the collision surface 14.
[0031]
As described above, when the reflecting plate 33 is attached to the collision surface 14, the upper and lower V grooves 34 u and 34 d facilitate the alignment of the reflecting plate 33 with respect to the collision surface 14. It is easy to obtain parallelism with the surface 14.
[0032]
In addition, the upper V grooves 34u and 34d engraved on the collision surface 14 can position the reflecting plate 33 with respect to the collision surface 14 on one of them.
[0033]
As shown in FIG. 3, at the rear part of the chassis frame F, a load receiving table G is supported on the left and right sides of the central rear bumper device BC via the parallel link mechanism Li of the lifting device E. The parallel link mechanism Li Left and right rear bumper devices BL and BR are respectively disposed on the left and right sides of the left and right sides . Since these rear bumper devices BL and BR have the same structure and are symmetrically fixed and supported by the cross member 7 fixed to the chassis frame F with the same support structure, FIGS. With reference to the structure of the left rear bumper device BL, the left support frame, that is, the front end of the connection bracket 1L is fixedly supported by the connection bolt 41 on the rear surface of the left end portion of the lower cross member 7d of the cross member 7. ing. This connecting bracket 1L is made of the same U-shaped cross section as that of the connecting bracket 5 or a square pipe steel material, and extends substantially horizontally rearward in the front-rear direction of the chassis frame F. The left rear bumper body 2L, which is a connection bracket, is fixedly supported by the fixing plate 42. The left rear bumper main body 2L is formed in the same structure by extrusion or drawing of an aluminum alloy as in the central rear bumper main body 2C, but is shorter than the central rear bumper main body 2C as shown in FIG. In addition, the rear surface, that is, the collision surface 14 is formed with a flat surface without a V-groove because the reflecting plate 33 is not attached. Further, the means for fixing the left rear bumper body 2L to the left support frame, ie, the connecting bracket 1L, is the same as the means for fixing the center rear bumper body 2C to the connection bracket 5, ie, the center support frame 1C. That is, as shown in FIGS. 10 and 11, a plurality of mounting plates 27 having fixing bolts 28 and mounting holes 29 with weld nuts are used, but detailed description thereof is omitted.
[0034]
As shown in FIG. 3, when the central rear bumper body 2C and the left and right rear bumper bodies 2L and 2R are attached to the cross member 7 of the chassis frame F, their rear surfaces, that is, the collision surfaces 14 are the same. It is on a flat surface and can perform the desired bumper function.
[0035]
As clearly shown in FIG. 3, the parallel link mechanism Li of the lifting device E is arranged in the gap formed between the center rear bumper device BC and the left and right rear bumper devices BL and BR. The lifting device E is supported by the support frame 1 for supporting the rear bumper devices BC, BL, BR on the chassis frame F. The support structure will be described below with reference to FIG. The support bracket 45 and the cylinder that form a pair for mounting the lifting device E on the left and right of the cross member 7 supported by the rear portion of the chassis frame F via the front and rear mounting brackets 4 and 5 as shown in FIG. The bracket 46 is welded. The lifting device E has a conventionally known structure, and the upper end of the upper link 47 and the lower link 48 that constitute the parallel link mechanism Li of the lifting device E rotate in the support bracket 45 in the vertical direction. The cylinder bracket 46 is pivotally connected to the cylinder bracket 46 so that the base end of the lifting / lowering cylinder 51 of the lifting / lowering device E is pivotable. Further, at the tips of the upper link 47 and the lower link 48, an elevating frame 53 that supports the load receiving table G is pivotally connected 54 and 55, and at the tip of the elevating cylinder 51, the parallel link mechanism Li is provided. Pivot connection 56 is made. Further, the distal ends of the left and right parallel link mechanisms Li are connected by a connecting rod 57 (see FIG. 3).
[0036]
Therefore, according to the expansion / contraction operation of the cylinder 51, the lifting operation of the parallel link mechanism Li can raise and lower the load receiving table G while maintaining the horizontal posture as shown by a chain line in FIG. By extending and retracting a hoisting cylinder (not shown) provided on the load receiving table G, the load receiving table G can be swung up and down, and as shown by the solid line in FIG. 1, the load receiving table G can be held upright in the storage position. it can.
[0037]
In addition, since the said raising / lowering apparatus E and the receiving platform G employ | adopt a conventionally well-known thing, the detailed description is abbreviate | omitted.
[0038]
Next, the operation of this embodiment will be described. The central, left, and right rear bumper devices B divided into three can cooperate to perform an intended bumper function. Since the device B is supported by the chassis frame F by using the support frame 1 of the lifting device of the load receiving platform without using a dedicated support member, the support rigidity of the rear bumper device B is greatly increased. Can be increased.
[0039]
Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are possible within the scope of the present invention. For example, in the above-described embodiment, the rear bumper device is divided into three parts. However, this may be a single unit. In this case, the rear bumper device has only the central rear bumper body on the left and right sides of the lifting device of the load receiving platform. It is located inside the parallel link mechanism. In the above embodiment, the case where the rear bumper device is implemented in a freight vehicle provided with a covered cargo box has been described. As the base and the lifting device, other conventionally known devices may be used instead of the above-described embodiments.
[0040]
【The invention's effect】
As described above, according to the present invention, the connecting bracket extending in the front-rear direction along the chassis frame is fixed to the rear portion of the chassis frame, and the central rear bumper body is fixed to the rear portion of the connecting bracket. Since the elevating device is supported at the front of the chassis via a cross member extending in the left-right direction , a dedicated support member is not required to attach the central rear bumper body to the chassis frame, reducing the number of parts. As a result, the structure can be simplified and a significant cost reduction can be achieved. In addition, it is necessary to extend a dedicated support member for supporting the central rear bumper body to the outside longer than the chassis frame. without addition by utilizing a high coupling bracket relatively rigid for supporting the fixed receiving platform of the lifting device at the rear of the chassis frame at the front, Central rear bumper body of the rear portion of the bracket by being supported, it is possible to enhance the supporting rigidity significantly.
[Brief description of the drawings]
FIG. 1 is a side view of a lorry with a rear bumper device and a cradle lifting device. FIG. 2 is a rear view of the lorry as viewed in the direction of the arrow 2 in FIG. FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3. FIG. 6 is a cross section taken along line 6-6 in FIG. 7 is an enlarged cross-sectional view taken along line 7-7 in FIG. 3. FIG. 8 is an exploded perspective view of the support portion of the central rear bumper device. FIG. 9 is a partially broken side view in the direction of arrow 9 in FIG. 10 is a sectional view taken along line 10-10 in FIG. 7. FIG. 11 is a sectional view taken along line 11-11 in FIG. 7. FIG. 12 is a sectional view taken along line 12-12 in FIG. FIG. 14 is a sectional view taken along the line 14-14 in FIG. 7. FIG. 15 is a perspective view of the rear bumper as viewed from the front. FIG. 16 is an oblique view of the rear bumper as viewed from the rear. View [Explanation of symbols]
1 ... support frame 2C · · · central rear bumper Body 2L · · · left portion rear bumper Body 2R · · · right portion rear bumper Body 5 .... connecting bracket
7. Cross member
E ... Elevator F ... Frame G ... Loading platform V ... Cargo box

Claims (1)

At the rear of the chassis frame (F) on which the cargo box (V) is mounted, a pair of left and right lifting devices (E) that lift and lower the loading platform (G) is provided with a loading platform lifting device that is spaced apart from each other in the lateral direction of the vehicle body . A rear bumper device for a vehicle ,
In the one provided with a central rear bumper body (2C) inside the pair of left and right lifting devices (E) ,
A connecting bracket (5) extending in the front-rear direction along the chassis frame (F) is fixed to the rear portion of the chassis frame (F), and the central rear bumper body (2C) is attached to the rear portion of the connecting bracket (5). On the other hand, on the front part of the connecting bracket (5), the lifting device (E) is supported so as to be movable up and down via a cross member (7) extending in the left-right direction of the vehicle body. Rear bumper device for attached vehicles.

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