JPH06211092A - Under-vehicle entry prevention bumper for large-sized vehicle - Google Patents

Abstract

PURPOSE:To mount a device for preventing a passenger car, a person or the like from entering a space under the body of a large-sized vehicle so as to make no interference with running of the large-sized vehicle. CONSTITUTION:A bumper member 22 which prevents a large-sized vehicle from entering a space under its body from the vehicle fore/aft direction or sideway direction is supported from the body so as to be deviated upwards to the body 10 from a prescribed position. Especially, in the case of a bumper which is mounted rearwards from rear wheels 10, a bottom contour line is made into a smoothly curved line which protrudes in an angular shape downward, when viewed from the vehicle side of a bumper assembly element 34 which consists of the bumper member and its supporting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inadvertently intrudes a vehicle or a person with a low vehicle height such as a passenger car into a space under a large height, which is left between a vehicle body and a road surface of a large vehicle. It relates to the bumper that prevents that.

[0002]

2. Description of the Related Art In a large-sized vehicle, the space under the vehicle left between the vehicle body and the road surface is such that when the large-sized vehicle and an ordinary passenger vehicle accidentally collide with each other, the engine section of the passenger vehicle is a large-sized vehicle. There is a danger that the lower edge of the body of a large vehicle may directly hit the occupant of the passenger car by being fitted into the space under the vehicle. A large vehicle is usually provided with a bumper device at the rear or side entrance of the space under the vehicle, but it is a large vehicle, especially a large vehicle such as a large trailer where the distance between the rear wheel and the rear end of the vehicle body is large. In order to prevent the bumper from touching the road surface when there is unevenness on the road surface or at the boundary between the slope and the flat ground, it is necessary to reduce the height of the bumper from the road surface. Has a limit. Also, especially in large vehicles,
When a person or a bicycle contacts the side of the vehicle, it is flipped by the front wheels to move the person or the bicycle toward the space under the vehicle instead of being hit by the rear wheels, causing more damage. I often receive it. Between the front wheels and the rear wheels, even in the case of a large vehicle, the vehicle body is guided at both ends by the front wheels and the rear wheels, so that the vehicle body is not curved at the road surface or at the boundary between the slope and the flat ground. Although the rear end does not come much closer to the road surface, the under-vehicle space intrusion prevention barrier that has been generally provided heretofore in this part still has its lower end lower than that of the road surface so as to avoid inadvertent contact with the road surface. It is provided only up to a position large enough to allow the invasion of the body, and there are no accidents where a person's body intrudes through this gap and is hit by the rear wheels.

[0003]

SUMMARY OF THE INVENTION The present invention has a limitation in reducing the height of a vehicle body or a bumper fixed to the vehicle body from the road surface for normal running of the vehicle itself in a large vehicle. From the viewpoint, the undercarriage space for large vehicles is inevitable for large vehicles, or the height dimension of the lower end of the bumper is extremely dangerous for ordinary passenger cars and passersby. Alternatively, without reducing the height of the lower end of the bumper, a passenger car is directly hit by the body of a large vehicle or a passerby is caught between the front and rear wheels by the body of a large vehicle when the engine part of the normal passenger car is thrust into the space under the car. An object of the present invention is to provide a device capable of preventing the risk of being damaged.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a bumper member arranged at a position for preventing entry from outside into a space under a vehicle left between a vehicle body and a road surface, and the bumper member. A suspension means for suspending at a predetermined height position relative to the vehicle body so as to be able to be biased by repeating only substantially upward from the height position. Achieved, and more specifically, a bumper member disposed at a position to prevent entry into the space under the vehicle left between the vehicle body and the road surface from the front and rear of the vehicle, and an outer end that extends substantially in the vehicle longitudinal direction. And a bumper assembly including an arm member that is joined to the bumper member and is pivotally attached to the vehicle body at an inner end so as to be pivotable around a pivot line extending in the vehicle lateral direction, and the bumper member is attached to the vehicle body. On the other hand, when the van is A suspension means for suspending the assembly with respect to the vehicle body, the bottom contour line of the bumper assembly seen from the vehicle side is provided by the arm member, and the contour line is a downwardly projecting mountain-shaped smooth line. Bumper member for preventing entry into the under-vehicle space for large vehicles, or a bumper member disposed at a position for preventing entry from the side of the vehicle into the under-vehicle space left between the vehicle body and the road surface And an arm member that extends substantially in the lateral direction of the vehicle, is joined to the bumper member at the outer end, and is pivotally attached to the vehicle body at the inner end so as to be pivotable about a pivot line extending in the vehicle longitudinal direction. And a suspension means for suspending the bumper assembly with respect to the vehicle body in a state in which the bumper member is at a predetermined height position with respect to the vehicle body, and from a side of the vehicle of the bumper assembly. The bottom contour line seen is the bumper member Thus it is given,
The contour line has a curved portion that smoothly rises at least at an end portion on the rear side of the vehicle. A bumper for preventing entry into the under-vehicle space for a large vehicle, or a bumper to the under-vehicle space left between the vehicle body and the road surface. A bumper member arranged at a position to prevent entry from the side of the vehicle between the front wheels and the rear wheels, and a bumper member that extends substantially in the lateral direction of the vehicle and is joined to the bumper member at the outer end and at the inner end. A bumper assembly including an arm member pivotally mounted on a vehicle body about a pivot axis extending in a vehicle longitudinal direction; and the bumper member in a state where the bumper member is at a predetermined height position with respect to the vehicle body. And a suspension means for suspending the assembly with respect to the vehicle body.

[0005]

By providing the bumper as described above on the rear portion or side portion of the large vehicle, when the large vehicle is traveling on an uneven road surface or a boundary between a slope and a flat ground, Even if the bumper comes into contact with the road surface due to the rear end of the car body being greatly offset in the direction of approaching the road surface or the car body coming very close to the road surface between the front and rear wheels, the bumper will not damage the car body. The vehicle can be repeatedly biased upward, and the running of the vehicle is not hindered. Also, in particular, as described above, the bumper assembly is a curved line that smoothly rises at its end portion, or a bottom contour line that has a curved portion that smoothly rises at least at the rear end portion of the vehicle that is separated from the rear wheel by a large amount. If the bumper assembly has such a structure, the bumper assembly is biased upward with respect to the vehicle body without any hindrance due to contact with the road surface, or gradually contacts the road surface only in the middle of the front and rear wheels so as to be upward with respect to the vehicle body without hindrance. Be biased. During normal driving, even if the bumper causes a collision with an ordinary passenger car, the passenger car is caught by the bumper member of the bumper at the engine part of the passenger car, and the passenger of the passenger car has a lower edge portion of the vehicle body of a large vehicle. The risk of being directly hit by is avoided, and the risk of being hit by a rear wheel even if a person comes into contact with the front wheel and is repelled is avoided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings.

1 to 3 of the accompanying drawings are side views of one embodiment in which a bumper according to the present invention is configured as a device for preventing entry of a large vehicle from the rear of the vehicle into the space under the vehicle. , A bottom view and a rear view. In these figures, 1
Reference numeral 0 is a rear wheel of a large vehicle, 12 is a carriage supported on wheels including the rear wheel 10, and 14 is a storage structure mounted on the carriage 12. Here, the combination of the dolly 12 and the storage structure 14 is referred to as a vehicle body 16. 1 and 2, the vehicle body 16 is shown at its rear end.

A bumper member 22 is provided in a state of being supported from the vehicle body 16 by a pair of arm members 24 at a position that prevents entry from the rear of the vehicle into the under-vehicle space 20 left between the vehicle body 16 and the road surface 18. Has been. The bumper member 22 is a plate member elongated in the horizontal direction, and a striped pattern 26 made of fluorescent paint is applied to the surface of the bumper member 22 facing the rear of the vehicle. The pair of arm members 24 are fixedly joined to the bumper member 22 at their outer ends (rear ends), and their inner ends (front ends) are pivoted by a pivoting device 28 to extend laterally of the vehicle. Around 30 is pivotally attached to the vehicle body. The pair of arm members 24 has a bumper member 2 at the outer end.
2 are rigidly joined to each other, and at the same time, they are rigidly connected to each other by a bar member 32 at an intermediate portion thereof. The bumper member 22, the pair of arms 24, and the bar member. A rigid connection of 32 forms a bumper assembly 34.

Thus, the bumper assembly 34, which is pivotally mounted to the vehicle body about the axis 30 by the pivoting device 28, has its bumper member 22 at a predetermined height position with respect to the vehicle body 16. The bumper assembly 34 is suspended from the vehicle body by suspension means including a shock absorber 36 that engages with a lug 35 provided in the central portion of the bumper member 22, and the bumper assembly 34 does not deviate downward from the position shown in the figure, In the range of a predetermined amount of deviation, it is possible to freely deviate with a buffering effect.

By providing such a bumper,
The under-vehicle space 20 having a large height in a large vehicle is substantially blocked by a bumper member 22 against intrusion from the rear of the vehicle, and even if a normal passenger vehicle collides with the large vehicle from the rear of the vehicle. , The engine part of a passenger car has a space under the vehicle 20
The risk of the passenger entering the vehicle and being directly hit by the rear end of the vehicle body 16 is avoided.

As shown in FIG. 1, the arm member 24 is bent so as to form a smooth curved line projecting downward in a mountain shape when viewed from the side of the vehicle, whereby the bumper assembly 34 is viewed from the side of the vehicle. The bottom contour line is a smooth curved line that is provided by the arm member 24 and projects downward in a mountain shape. In this way, the bottom contour line of the bumper assembly viewed from the vehicle side is a smooth curved line projecting downward in a mountain shape, so that the wheels are not recessed on the road surface while the vehicle is running as shown in FIG. Even when the rear end of the vehicle body comes very close to the road surface due to the intrusion, the bumper assembly 34 can be biased upward with respect to the vehicle body while smoothly contacting the road surface to avoid a rigid collision with the road surface. it can. Further, as shown in FIG. 5, when the vehicle moves to a road surface that is smoother than a downhill, the rear end of the vehicle body is separated from the rear wheels by a large distance, so that when the rear end of the vehicle body approaches the road surface considerably, Bumper assembly 3
4 is biased upward with respect to the vehicle body while being in smooth contact with the road surface to avoid rigid contact with the road surface.

Further, in the illustrated embodiment, the arm member 24 is bent downward so as to form a smooth curve line protruding in a mountain shape, so that the bumper assembly 34 is resistant to an impact force in the longitudinal direction of the vehicle. It has a flexible shock absorbing ability, and when the passenger car or the like collides with the bumper member 22, the impact force applied to the passenger car or the like can be softened.

FIGS. 6 to 8 are schematic views showing an embodiment in which the bumper according to the present invention is configured as a device for preventing the vehicle from entering the space under the vehicle left between the vehicle body and the road surface from the side of the vehicle. It is a side view, a bottom view, and a rear view, and is a figure similar to FIGS. 6 to 8, portions corresponding to the portions in FIGS. 1 to 3, that is, portions relating to the configuration of the vehicle itself are shown in FIG.
It is designated by the same reference numeral as in FIG.

In this embodiment, the bumper members 38 are provided to the left and right at positions where the vehicle underside 20 is prevented from entering from the side of the vehicle.
And 40 are arranged. Stripe patterns 41 made of fluorescent paint are applied to the outer surfaces of these bumper members.
In the illustrated embodiment, the bumper member 38 is supported by the pair of arm members 42, and the bumper member 40 is supported by the pair of arm members 44 from the vehicle body 16 so that the bumper member 38 can be biased upward with respect to the vehicle body 16 from the illustrated position. There is. The vehicle shown in the drawing has a pair of bogie frame members 46 and 48 extending in the longitudinal direction of the vehicle in a part of the bogie 12, and the left bumper member 38.
A pair of arm members 42 for supporting the vehicle are rigidly joined to the bumper member 38 at the outer ends thereof, and at the inner ends thereof, over the central axis of the vehicle, to the bogie frame member 48 on the right side by the pivoting device 50 by the vehicle vertical direction. It is pivotally mounted about a directionally extending pivot axis 52. Similarly, the arm member 44 that supports the bumper member 40 on the right side beyond the longitudinal centerline of the vehicle is rigidly joined to the bumper member 40 at its outer end, and the left side beyond the vehicle center axis line at its inner end. The bogie frame member 46 is mounted by a pivoting device 54 so as to be pivotable about a pivot line 56 extending in the vehicle longitudinal direction. In this way, the arm member 42 that supports the left bumper member 38 is pivotally attached to the right bogie frame member 48 across the longitudinal centerline of the vehicle, and the arm member 44 that supports the right bumper member 40 is of the vehicle. By being pivotally attached to the bogie frame member 46 on the left side beyond the longitudinal centerline, the turning radius of the bumper members 38, 40 in the vertical direction deviation with respect to the vehicle body can be made long, and the bumper members 38, 40 can be made into the vehicle body 16 The vertical movement of the bumper member 3
The relatively thin arm members 42 and 44 can sufficiently receive the impact force applied to the side members 8 and 40 from the side.

The pair of arm members 42 are rigidly joined to the bumper member 38 at the outer ends thereof, and at the same time, they are rigidly joined to each other by the bar member 58 at the intermediate portion thereof. 38 together with the pivot 52
Comprises a bumper assembly 60 that pivots around
Similarly, the pair of arm members 44 are rigidly joined to the bumper member 40 at their outer ends, and at the same time, they are rigidly joined to each other by the bar member 62 at their intermediate portions, so that the pivot line 56 is formed. A bumper assembly 64 that pivots integrally with the bumper member 40 is formed. The bumper assembly 60 does not move downward from the position shown in the drawing, but the pivot line 52 is not moved by the shock absorber 66 mounted between the central portion of the bar member 58 and the frame member 46 of the truck.
It is suspended from the vehicle body so that it can be freely biased upward with respect to the vehicle body with a cushioning effect. Similarly, the bumper assembly 64 does not move downwards from the position shown, but is pivoted about the axis 56 relative to the vehicle body by a shock absorber 68 mounted between the center of the bar member 62 and the frame member 48 of the truck. It can move freely upwards with a cushioning effect.

As shown, the bumper members 38 and 40 are formed so that their lower edges have a smoothly curved line protruding downward in a mountain shape, and the lower edges of the bumper members are the bumper assemblies 60 and 64. The bottom contour line seen from the side of the vehicle is given. Since the bottom contour lines of the bumper assemblies 60 and 64 are formed as the smooth curved lines projecting downward in a mountain shape as described above, the wheel 1 is not easily moved while the vehicle is running as shown in FIG.
Even when the rear part of the vehicle body comes very close to the road surface due to the intrusion of 0 into the depression on the road surface, the bumper assembly has a lower edge forming a smooth curved line protruding downward in a mountain shape on the bumper member 38 or 40. It smoothly contacts the road surface and is biased upward with respect to the vehicle body, and does not hinder the running of the vehicle. Similarly, as shown in FIG. 10, when the vehicle moves from a downhill to a flat road surface, even if the rear end of the vehicle body significantly approaches the road surface due to the rear end of the vehicle body projecting greatly from the rear wheels, The bumper assembly smoothly contacts the road surface and is biased upward with respect to the vehicle body so as not to hinder the running of the vehicle.

FIG. 11 is a side view similar to FIG. 6 showing an embodiment in which a part of the embodiment shown in FIGS. 6 to 10 is modified. Since the ends of the bumper members 38, 40 on the vehicle front side are located close to the rear wheels 10, even if there is a steep slope, a step, or a foreign object on the road surface, the bumps 38, 40 immediately reach the rear wheels 10 immediately after getting over them. Since they are encountered, there is no risk of these steep slopes, stepped portions, or foreign matter hitting the front ends of the bumper members 38, 40 from the front, and they almost hit from the bottom to the top. Therefore, the contours of the lower edges of the front end portions of the bumpers 38 and 40 located immediately behind the rear wheels 10 do not have to be a curved surface that intentionally rises smoothly, and may be the contours as shown in FIG. .

12 to 14 show that the bumper according to the present invention intrudes another vehicle or a person from the side of the vehicle into the space under the vehicle left between the front wheel and the rear wheel and between the vehicle body and the road surface. FIG. 13 is a side view, a bottom view, and a view taken along arrow XIV-XIV in FIG. 12, showing an embodiment configured as a device for preventing the above, and a view similar to FIGS. 1 to 3 or 6 to 8. Is.
12 to 14, parts corresponding to parts 1 to 3 or parts 6 to 8 are designated by the same reference numerals as those in these figures.

In a large vehicle such as a truck or a trailer, a fixed under-vehicle space intrusion prevention barrier 76 is generally provided at a side edge portion of the bogie between the front wheels 70 and the rear wheels 10. This is composed of, for example, a pair of support rods 72 fixed to the chassis as shown in the figure, and a few lateral rods 74 bridged between them, the lower end of which is flat with uneven roads and slopes. The height position is set at a considerable distance from the road surface so that even if the road surface rises between the front and rear wheels at the boundary with the ground, the road surface will not come into contact with the road surface.

According to the present invention, the bumper member 78 is provided so as to close the space between the lower end of the fixed under-vehicle space intrusion prevention barrier 76 and the road surface. The bumper member 78 is supported by the pair of arm members 80 located on both sides of the barrier 76 when viewed from the side of the wheel so that the bumper member 78 can be displaced upward from the position shown in the figure from the vehicle body. The pair of arm members 80 are fixedly connected to the bumper member 78 at the outer ends thereof to form a bumper assembly 82, and the inner ends of the pair of arm members 80 are supported by the pivoting device 84 to extend downward relative to the carriage 12. It is pivotally mounted about a pivot 88 at the portion of portion 86.

A pair of shock absorbers 90 are pivotally mounted at both ends between the outer ends of the pair of arm portions 80 and the laterally extending portion 92 of the carriage 12, and the shock absorbers 90 make a bumper assembly. The three-dimensional body 82 is held so that the bumper member 78 does not fall below the height position shown in the figure but can be freely biased upward with a cushioning action.

FIG. 15 and FIG. 16 are views showing a state in which the bumper member 78 comes into contact with the road surface 18 and is pushed up from the normal height position while the vehicle is traveling on the road surface portion which is convex upward. It is a figure corresponding to 12 and FIG. As is apparent from the figure, when the road surface comes into contact with the bumper member 78 from below, the bumper assembly 82 rotates upward about the axis 88 as a whole while reducing the size of the shock absorber 90. At this time, when the pivot line 88 is located higher than the upper end of the bumper member 78 as in the illustrated embodiment, the bumper member 78 is biased upward with respect to the vehicle body and is biased outward at the same time. Are arranged on both sides of the fixed barrier 76 as viewed from the side of the vehicle, and the bumper member 78 is
Is positioned slightly outward of this so that it does not interfere with the lower end of the fixed barrier 76 in the initial stage of its upward bias,
The upward deflection of the bumper assembly 82 can be made smooth without interference with the fixed barrier 76. Further, as understood from FIG. 15, the bumper member 7
Since both ends of the vehicle 8 are arranged close to the front wheel 70 and the rear wheel 10, there is no possibility that the convex portions of the road surface may abut these both ends in the lateral direction. Therefore, in this case, both end portions of the bumper member 78 are provided. The contour may not be so greatly curved upward.

In the above, for the purpose of clarifying the illustration,
A bumper that prevents entry from the rear of the vehicle into the space below the vehicle, and a bumper that prevents entry from the side of the vehicle into the space below the vehicle at the rear of the vehicle Although the bumper for preventing the above is described as a separate embodiment, it will be apparent that the bumper of each of these embodiments may be simultaneously incorporated in one vehicle.

It will be apparent to those skilled in the art that various modifications can be made to the embodiment described in detail above with reference to the accompanying drawings within the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a side view of a bumper according to an embodiment of the present invention.

FIG. 2 is a bottom view of the bumper shown in FIG.

FIG. 3 is a rear view of the bumper shown in FIGS. 1 and 2.

FIG. 4 is a side view showing an example of an operating state of the bumper shown in FIGS. 1 to 3.

5 is a side view showing another example of the operating state of the bumper shown in FIGS. 1 to 3. FIG.

FIG. 6 is an exploded side view showing another embodiment of the bumper according to the present invention.

FIG. 7 is a bottom view of the bumper shown in FIG.

FIG. 8 is a rear view of the bumper shown in FIGS. 6 and 7.

FIG. 9 is a side view showing an example of an operating state of the bumper shown in FIGS.

FIG. 10 is a side view showing another example of the operating state of the bumper shown in FIGS.

FIG. 11 is a side view showing an embodiment in which a part of the bumper shown in FIGS. 6 to 10 is modified.

FIG. 12 is a side view of the bumper according to the present invention, showing a further embodiment of the bumper.

13 is a bottom view of the bumper shown in FIG.

14 is a view taken along the arrow XIV-XIV in FIG.

FIG. 15 is a side view showing an example of an operating state of the bumper shown in FIGS.

16 is a view corresponding to the arrow view of FIG. 14 showing the operating state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rear wheel 12 ... Bogie 14 ... Storage structure part 16 ... Vehicle body 18 ... Road surface 20 ... Under-vehicle space 22 ... Bumper member 24 ... Arm member 26 ... Stripe pattern 28 ... Pivoting device 30 ... Axis 32 ... Bar member 34 ... Bumper assembly 36 ... Shock absorber 38, 40 ... Bumper member 41 ... Stripe pattern 42, 44 ... Arm member 46, 48 ... Bogie frame member 50 ... Pivot device 52 ... Pivot line 54 ... Pivot member 56 ... Pivot line 58 ... Bar member 60 ... Bumper assembly 62 ... Bar member 64 ... Bumper assembly 66, 68 ... Shock absorber 70 ... Rear wheel 72 ... Support rod 74 ... Transverse rod 76 ... Fixed under-vehicle space intrusion prevention barrier 78 ... Bumper Member 80 ... Arm member 82 ... Bumper assembly 84 ... Pivoting device 86 ... Bogie support 88 ... Axis 90 ... Shock absorber 92 ... Bogie Direction overhang

Claims (11)

[Claims] 1. A bumper member arranged at a position for preventing entry from outside into a space under the vehicle left between the vehicle body and a road surface, and the bumper member at a predetermined height position with respect to the vehicle body. A vehicle under space intrusion prevention bumper for a large vehicle, comprising: a suspension means for suspending so as to be capable of being biased repeatedly only substantially upward. 2. A bumper member arranged at a position to prevent entry into the space under the vehicle left between the vehicle body and the road surface from the front and rear of the vehicle, and the bumper member substantially extending in the vehicle longitudinal direction at the outer end. A bumper assembly including an arm member that is joined to the bumper member and is pivotally attached to an inner end of the vehicle body about a pivot line extending in the vehicle lateral direction; Suspension means for suspending the bumper assembly with respect to the vehicle body in a state of being in a height position, and a bottom contour line of the bumper assembly seen from the vehicle side is given by the arm member, and the contour line is A bumper for preventing entry into the under-vehicle space for large vehicles, which is characterized by a smooth curved line protruding downward in a mountain shape. 3. The under-vehicle space intrusion prevention bumper for a large vehicle according to claim 2, wherein the vehicle has a pair of vertical bogie frame members, and each of the arm members has the vertical bogie frame at an inner end thereof. A bumper for preventing entry into a space under a vehicle for a large vehicle, comprising a pair of arm members pivotally attached to the members. 4. The under-vehicle space intrusion bumper for a large vehicle according to claim 2 or 3, wherein the suspension means is a shock absorber. 5. A bumper member arranged at a position for preventing intrusion from the side of the vehicle into a space below the vehicle left between the vehicle body and the road surface, and an outer end extending substantially in the lateral direction of the vehicle. A bumper assembly including an arm member joined to the bumper member and pivotally attached to the vehicle body at an inner end thereof so as to be pivotable about a pivot line extending in the vehicle longitudinal direction; Suspension means for suspending the bumper assembly with respect to the vehicle body at a height position of the bumper assembly, and a bottom contour line of the bumper assembly seen from the vehicle side is given by the bumper member. Is a bumper for preventing entry into a space under a vehicle for a large vehicle, which has a curved portion that smoothly rises at least at a rear end of the vehicle. 6. The under-vehicle space intrusion prevention bumper for a large vehicle according to claim 5, wherein an inner end of the arm member with respect to the bumper member arranged on the right side of the vehicle crosses a longitudinal centerline of the vehicle and is on the left side of the vehicle. And an inner end of the arm member with respect to the bumper member arranged on the left side of the vehicle is pivoted to a bogie frame member on the right side of the vehicle beyond the longitudinal centerline of the vehicle. A bumper for preventing entry into the space under the vehicle for large vehicles. 7. The under-vehicle space intrusion bumper for a large vehicle according to claim 5 or 6, wherein the suspension means is a shock absorber. 8. A bumper member arranged at a position to prevent the vehicle from laterally entering between a front wheel and a rear wheel into a space under a vehicle left between a vehicle body and a road surface, and a vehicle lateral side substantially. A bumper assembly that extends in a direction and is joined to the bumper member at an outer end and is pivotally attached to the vehicle body at an inner end so as to be pivotable about a pivot line extending in the vehicle longitudinal direction. A bumper member for suspending the bumper assembly with respect to the vehicle body in a state where the bumper member is at a predetermined height position with respect to the vehicle body. 9. The under-vehicle space intrusion prevention bumper for a large vehicle according to claim 8, wherein the bumper member is provided on a side edge of the vehicle between a front wheel and a rear wheel when the bumper member is at the predetermined height position. A fixed type vehicle-under-space intrusion prevention barrier provided along the height position to prevent entry into the vehicle-under-space at a height position below the barrier, and the arm member is fixed-type when viewed from the side of the vehicle. A pair of arm members on both sides of the under-vehicle space intrusion prevention barrier, which are configured so as not to interfere with the fixed under-vehicle space intrusion prevention barrier when the bumper member is moved upward relative to the vehicle body. A bumper for preventing intrusion under the vehicle space for large vehicles. 10. A bumper for preventing entry into a space under a vehicle for a large vehicle according to claim 9, wherein a pivot line at the inner ends of the pair of arm members is located higher than an upper edge of the bumper member. When the bumper member is relatively moved upward with respect to the vehicle body, the bumper member is displaced laterally outward with respect to the vehicle body so as to avoid interference between the bumper member and the fixed under-vehicle space intrusion prevention barrier. A bumper for preventing intrusion into the under-vehicle space for large vehicles. 11. The under-vehicle space intrusion bumper for a large vehicle according to any one of claims 8 to 10, wherein the suspension means is a shock absorber.