JP3838621B2 - 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, as a rear bumper device for the above-mentioned vehicle, for example, those disclosed in Utility Model Registration No. 2567089 and Japanese Utility Model Publication No. 1-173032 are well known.
[0003]
By the way, in this conventional one, the rear bumper body is fixed to a support post fixed to the rear portion of the chassis frame or supported by the lifting mechanism itself of the load receiving table. The rear bumper main body has been generally constituted by press forming of a steel material so far as it is prevented from entering downward.
[0004]
[Problems to be solved by the invention]
However, in such a conventional rear bumper device, the central rear bumper body constituting the main part is made of steel.
1) the weight of the center rear bumper body is heavy, it takes a great deal of the effort in the mounting work, the work efficiency is not evil.
[0005]
2) Since the central rear bumper body is difficult to make into the same cross-sectional shape over its entire length, the weight balance over its entire length is not good.
[0006]
3) It is troublesome to form the central rear bumper body in an arbitrary length so as to correspond to an arbitrary vehicle width.
There are problems such as.
[0007]
The present invention has been made in view of such circumstances, and the center rear bumper body is extruded into an aluminum alloy or formed by pultrusion, so that it is lightweight and easy to handle, and has a good weight balance. Another object of the present invention is to provide a rear bumper device in a vehicle equipped with a new load receiving platform lifting / lowering device that can easily cope with an arbitrary vehicle width.
[0008]
[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, comprising a central rear bumper body extending in the left-right direction of the vehicle body inside a pair of left and right lifting devices , along the chassis frame at the rear of the chassis frame The connecting bracket extending in the front-rear direction is fixed, and the central rear bumper body is fixed to the rear portion of the connecting bracket, while the elevating device can be moved up and down via a cross member extending in the left-right direction at the front portion of the connecting bracket. supported on the central portion rear bumper body, and characterized in that it is formed by an aluminum alloy extrusion or drawing, And, according to this aspect, it is easy to manufacture the central rear bumper body, in particular, because it requires when simply cut to be formed in the arbitrary length, corresponding to the plurality of types of vehicles with different vehicle widths Is very easy. Further, since the central rear bumper body is lightweight, it is easy to handle and attach to the connecting bracket , and further, it is formed in the same cross section over its entire length, so the weight balance is good.
[0009]
In order to achieve the above object, the invention described in claim 2 is the one described in claim 1, wherein at least the outermost end of the central rear bumper body is covered with a side cover. According to this feature, the same effect as the invention of claim 1 is achieved, the appearance is good, and there is no hindrance to pedestrians and workers, and the center portion Rain and other water will not enter the rear bumper body.
[0010]
Furthermore, in order to achieve the above object, the invention according to claim 3 is the one according to claim 1, wherein the central rear bumper body includes a front surface which is a mounting surface on the connection bracket side, and a collision surface. A certain rear surface is parallel to each other, and the collision surface is formed in a trapezoidal shape that is wider than the mounting surface. According to this feature, the invention of claim 1 is provided. and on to achieve the same effect, it is possible to increase the vertical width of the impact surface of the central portion rear bumper body can effectively fulfill the bumper functions for different following vehicle heights, yet, to the connecting bracket Can be easily installed, and can be stored compactly when stocked.
[0011]
Furthermore, in order to achieve the above object, the invention according to claim 4 is the attachment hole according to claim 1, wherein a reflection plate is attached to the collision surface of the central rear bumper body. The groove used for alignment of the drilling position is formed along the longitudinal direction of the collision surface. According to this feature, the same effect as that of the invention of claim 1 can be obtained. In addition, when attaching the reflecting plate to the collision surface of the rear bumper body, the positioning becomes easy, and the reflecting plate can be reliably and easily attached to the proper place of the rear bumper body.
[0012]
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.
[0013]
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.
[0014]
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.
[0015]
In addition, the said raising / lowering apparatus E and the receiving stand G use a conventionally well-known thing.
[0016]
Next, the structure of the rear bumper device of the lorry with a load receiving platform G lifting device, which is the gist of the present invention, will be described in detail with reference to FIGS.
[0017]
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.
[0018]
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.
[0019]
First, the structure of the central rear bumper device BC will be described.
[0020]
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).
[0021]
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.
[0022]
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.
[0023]
Next, the center rear bumper main body 2C and its mounting structure to the support frame 1C will be described.
[0024]
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.
[0025]
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.
[0026]
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.
[0027]
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.
[0028]
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. 3, if the spacer 11 and the fixing plate 10 are screwed to the fixing bolts 28 of the pair of mounting plates 27, the central rear bumper body sandwiches the spacer 11 with the fixing plate 10 of the central support frame 1C. 2C can be positioned and fixed.
[0029]
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.
[0030]
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. For fixing to the reflecting plate 33, the collision surface 14 is provided with grooves 34, ie, two upper and lower V-grooves 34u and 34d, which are parallel to the longitudinal direction. 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.
[0031]
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.
[0032]
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.
[0033]
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.
[0034]
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.
[0035]
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.
[0036]
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.
[0037]
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.
[0038]
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.
[0039]
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 front end is fixedly supported by the connecting bolt 41 on the left support frame 1L on the rear surface of the left end of the lower cross member 7d of the cross member 7. This left support frame 1L is made of the same U-shaped cross section as that of the connecting bracket 5 or a square pipe steel, and extends substantially horizontally behind the chassis frame F in the front-rear direction, and is fixed to the rear end. The plate 42 is welded, and the left rear bumper body 2L is fixedly supported by the fixed 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 1L is the same as the means for fixing the center rear bumper body 2C to the center support frame 1C. That is, FIGS. As shown in the drawing, 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.
[0040]
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.
[0041]
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 elevating device E is supported by using the support frame 1 that supports 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).
[0042]
Therefore, according to the extending / contracting operation of the lifting / lowering cylinder 51, the lifting / lowering operation of the parallel link mechanism Li can lift / lower the load receiving table G while maintaining the horizontal posture as shown by a chain line in FIG. Further, the cradle G can be swung up and down by an expansion and contraction operation of a undulation cylinder (not shown) provided on the cradle G, and as shown by a solid line in FIG. be able to.
[0043]
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.
[0044]
Next, the operation of this embodiment will be described. The central, left and right rear bumper devices B divided into three can cooperate with each other to perform an intended bumper function, and in particular, the rear bumper device B. The rear bumper main body 2 is formed by extrusion or drawing of an aluminum alloy, so that it can be easily manufactured and can be easily applied to vehicles having different vehicle widths. Moreover, since it is lightweight, the handling and attachment are easy.
[0045]
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 case where the rear bumper device of the present invention is applied to a freight vehicle having a covered cargo box has been described, but it is needless to say that this can also be applied to a freight vehicle having an uncovered cargo box. In addition to the above-described embodiment, other conventionally known ones may be used for the cargo receiving platform and the lifting device.
[0046]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the rear bumper device of the vehicle provided with the load receiving base lifting device, the central portion that is supported by the connecting bracket supported by the rear portion of the chassis frame and extends in the left-right direction of the vehicle body. Since the rear bumper body is formed by extrusion or drawing of aluminum alloy, it is easy to manufacture the central rear bumper body, and in particular, it can be simply cut to form it at any length. It is very easy to deal with multiple types of vehicles. Further, since the central rear bumper body is lightweight, it is easy to handle and attach to the connecting bracket , and further, it is formed in the same cross section over its entire length, so the weight balance is good.
[0047]
Further, according to the invention of claim 2, the same effect as the invention of claim 1 is achieved, the appearance is good, and there is no hindrance to pedestrians and workers, Furthermore, water such as rainwater does not enter the central rear bumper body.
[0048]
Furthermore, according to the third aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the vertical width of the collision surface of the central rear bumper main body can be increased, and subsequent heights different from each other can be obtained. The bumper function can be effectively performed on the vehicle, and the mounting to the connecting bracket is facilitated. Further, the vehicle can be stored compactly at the time of stock.
[0049]
Furthermore, according to the fourth aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and when the reflector is attached to the collision surface of the central rear bumper body, the alignment is easy. Thus, the reflector can be reliably and easily attached to the proper place of the central rear bumper body.
[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 ... supporting frame 2 C · · · central rear bumper Body
5 ... Connection bracket
7 .... Cross member 13 ... Mounting surface (front)
14 ... Collision surface (rear surface)
25 ... Side cover E ... Lifting device G ... Loading platform V ... Packing box

Claims (4)

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 what is provided with a central rear bumper body (2C) extending in the left-right direction of the vehicle body 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, the lifting device (E) is supported at the front of the connecting bracket (5) through a cross member (7) extending in the left-right direction of the vehicle body so as to be movable up and down.
The rear bumper device for a vehicle with a load receiving platform lifting apparatus, wherein the central rear bumper body (2C) is formed by extrusion or drawing of an aluminum alloy. The rear bumper device for a vehicle with a cargo receiver / lifter according to claim 1, wherein at least an outermost end of the central rear bumper body ( 2C) is covered with a side cover (25). The central rear bumper body ( 2C) has a front surface (13) which is an attachment surface on the side of the connecting bracket (5) and a rear surface (14) which is a collision surface which are parallel to each other, and the collision surface ( 14. The rear bumper device for a vehicle with a cargo receiving platform lifting / lowering device according to claim 1, wherein 14) is formed in a trapezoidal cross section that is wider than the mounting surface (13). Grooves used for positioning the mounting holes (35, 36) for attaching the reflector (33) to the collision surface (14) in the collision surface (14) of the central rear bumper body ( 2C). The rear bumper device for a vehicle with a cargo receiving platform lifting / lowering device according to claim 1, wherein the strip (34) is formed along the longitudinal direction of the collision surface (14) .

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