JP3848819B2 - Body structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body structure that absorbs the impact force of a vehicle when the vehicles collide with each other in the traveling direction to mitigate the impact force acting on the passenger cabin, and is used for a vehicle having a passenger cabin or an automobile having a driver's seat. Is preferred.
[0002]
[Prior art]
The various types of track-type medium-duty transportation systems, called new transportation systems, are generally new technologies that combine railway technology such as electric motors, current collectors, and vehicle bodies with vehicle technology for driving rubber wheels, and add computer control. is there. The technology called a rubber tire type new transportation vehicle is equipped with a rubber running wheel that can be steered to a box-shaped car body, and this running wheel can be driven by an electric motor, while providing a dedicated track and train line. It is. Accordingly, the vehicle can travel along the track by rotationally driving the traveling wheels while the electric motor is supplied with electric power from the current collector in the traveling zone.
[0003]
In such an operation management system for a rubber tire type new traffic vehicle, automatic vehicle driving equipment, signal security equipment, communication equipment, electric power equipment, disaster prevention management equipment, etc. are linked to each other, thereby managing vehicle diagram management and route control. Centralized management of display control, operation control, etc. allows the vehicle to operate unattended, smoothly and safely.
[0004]
By the way, in this rubber tire type new transportation vehicle, when the control device in the operation management system breaks down, various operation operations can be manually performed by the driver. In this case, the traveling speed is limited to a low speed. On the other hand, when the driver manually operates the vehicle, a collision accident between the vehicles may occur due to an erroneous operation or the like. Therefore, the impact at the time of the vehicle collision is absorbed in the front end portion and the rear end portion of the vehicle. A crash zone is provided.
[0005]
FIG. 7 shows an outline of a frame structure at the front end portion of the vehicle representing a conventional vehicle body structure. As shown in FIG. 7, a frame 102 is formed continuously on the vehicle body floor (guest room) 101, and a bumper 103 having a U shape in plan view is fixed to the front of the frame 102. On the other hand, a front end roof frame 105 having a U-shape in plan view is fixed to the vehicle body roof 104, and the front end roof frame 105 and the bumper 103 are connected by a plurality of front beams 106 and side beams 107. Has been. The front beam 106 and the side beam 107 are connected by a connecting beam 108. In this way, the front end 109 is constituted by the frame 102, the bumper 103, the front end roof frame 105, the beams 106, 107, 108, and the like. In addition, an outer wall 110 made of FRP is attached to the outside of the structure formed of the skeleton.
[0006]
Therefore, when a rubber tire type new transportation vehicle collides head-to-head with each other, each member buckles and the front wife 109 is crushed by the front wife 109, so that the shock caused by the collision is absorbed by the front wife 109. The impact force transmitted to the cabin behind the unit 109 is reduced, and deformation can be prevented.
[0007]
[Problems to be solved by the invention]
By the way, the vehicle traveling on the exclusive track as described above is preferably streamlined in consideration of the design of the vehicle body and air resistance, and the conventional vehicle body has an acute-angle front end. However, if the front end portion of the vehicle body has an acute angle shape, when the vehicles collide head-on, one vehicle body rides on the other vehicle body, and the front wife 109 is not properly crushed. Therefore, the impact force at the time of a collision cannot be absorbed by the front wife 109, and the impact force may be partially transmitted to the cabin and deformed.
[0008]
In addition, it is conceivable to install a bumper that protrudes to the front part of the vehicle body like a car so that the front wife part 109 can be properly crushed without shifting up and down during a frontal collision between vehicles, If a large bumper is mounted on the front end of the vehicle body in this way, the design of the vehicle is changed, and the appearance quality is significantly deteriorated.
[0009]
The present invention solves such problems, and the vehicle body is designed to improve safety by properly impacting each other and absorbing impacts without deteriorating appearance quality and air resistance. The purpose is to provide a structure.
[0010]
[Means for Solving the Problems]
Body structure of the invention of claim 1 for achieving the above object, as a component of the ex-wife portion serving as a crash zone to absorb the impact force of collision provided at the front end portion of vehicles, the progression of pre-Symbol vehicle Bumpers having buckling strength changing means are provided on both side portions that are disposed in a direction substantially perpendicular to the direction and project so that the central portion protrudes forward of the vehicle and spreads in the vehicle width direction toward the rear of the vehicle. The strength changing means is a plurality of holes formed in the both side portions of the bumper along the longitudinal direction of the bumper .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is a schematic view of a framework structure of a vehicle front end portion representing a vehicle body structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along III-III in FIG. FIG. 5 is a schematic perspective view of the tip of the underframe, FIG. 5 is a side view of the vehicle, and FIG. 6 is a front view of the vehicle.
[0016]
The vehicle to which the vehicle body structure of the present embodiment is applied is a track-type medium-duty transport system, in which an electric motor rotates a driving wheel while receiving power from a train line on the track, and automatically runs on a dedicated track unattended. It is applied to new rubber tire type transportation vehicles.
[0017]
That is, in this embodiment, as shown in FIGS. 5 and 6, the vehicle 11 has a cabin 12 formed in the center, and a front wife 13 and a rear wife 14 that form a crash zone at the front and rear ends. Yes. A pair of left and right wheels 15 and 16 are attached to the lower part of the vehicle body at the front and rear, and the wheels 15 and 16 can be driven and rotated by drive devices 17 and 18 having drive motors, and can be steered by steering devices 19 and 20. ing. A pair of left and right guide wheels 21 and 22 are mounted on the side of the vehicle body, and each guide wheel 21 and 22 can roll to the left and right guide walls 23 and 24. Further, a pair of left and right current collectors 25 and 26 is mounted on the side of the vehicle body, and each current collector 25 and 26 is in sliding contact with train lines 29 and 30 attached to the left and right side walls 27 and 28. Note that control devices for the drive devices 17 and 18 and the steering devices 19 and 20 are mounted on the front wife portion 13 and the rear wife portion 14 described above.
[0018]
Therefore, the drive devices 17 and 18 are supplied with electric power from the train lines 29 and 30 via the current collectors 25 and 26, and rotate the wheels 15 and 16, so that the guide wheels 21 and 22 are transferred to the guide rails 23 and 24. The vehicle is driven and guided, and the steering devices 19 and 20 steer the wheels 15 and 16 so that the vehicle can travel along a predetermined dedicated track. Since the rubber tire type new transportation vehicle 11 travels while being restrained by a track made up of the guide wheels 21 and 22 and the guide rails 23 and 24, when the collision accident between the vehicles occurs, the vehicles 11 move in the left-right direction. Although it collides without slipping, the impact can be absorbed by the front wife portion 13 and the rear wife portion 14 becoming a crash zone and being crushed.
[0019]
In the front end portion 13 of the rubber tire type new transportation vehicle 11, as shown in FIGS. 1 to 4, the front and rear end portions of the side frames 31 located on both sides of the vehicle body are U-shaped inner bumpers 32. (The inner bumper at the rear end is omitted) are connected to each other, the side frame 31 has a closed cross-sectional shape, and the inner bumper 32 has a U-shaped cross section that opens rearward. The underframe 33 is constructed by laying a plurality of cross beams (not shown) on the inner side of the side frames 31 and the inner bumper 32 and mounting a floor plate 34 thereon. A pair of left and right side reinforcing beam members 35 are disposed on both sides of the front end portion of the frame 33, the front end portion is connected to the inner bumper 32, and the rear end portion is connected to the horizontal beam. 35 are connected by a lateral reinforcing beam member 36 having a closed cross-sectional shape. In addition, a pair of left and right central reinforcing beam members 37 are disposed at the front end of the frame 33, the front end is connected to the inner bumper 32, and the rear end is connected to the horizontal beam. Crossed and connected.
[0020]
In this case, the inner bumper 32 includes a central portion 32a that is slightly curved in an arc shape, and side portions 32b that are integrally formed to be inclined on both sides thereof, and a plurality of holes are formed in both side portions and both side portions 32b of the central portion 32a. (Buckling strength changing means) 32c is formed. Further, the side reinforcing beam member 35 has an L-shaped cross section, and a horizontal portion 35a extending in the front-rear direction and a bent portion 35b extending in the front and lower direction are integrally formed, and a plurality of holes 35c are formed in the front portion. . Further, the central reinforcing beam member 37 is formed of a rear beam 37a having an L-shaped cross section and a front beam 37b having a flat plate shape and curved in an arc shape downward and downward, and the rear beam 37a is formed separately from the lateral reinforcing beam member 36. The front beam 37 b is installed between the inner beam bumper 32 and the horizontal reinforcing beam member 36.
[0021]
A pair of left and right buffer members 39 and 40 are disposed at the front end of the frame 33. The buffer members 39, 40 have substantially the same configuration, and the base end portions of the main bodies 39b, 40b, each of which is a square tube and formed with a plurality of openings 39a, 40a, are bolted to the cross beams by the reinforcing brackets 39c, 40c. Box-shaped collision parts 39d, 40d are bolted to the parts, and the collision parts 39d, 40d are connected by a connecting rod 41. The collision portions 39d and 40d are located at a slight distance from the inner bumper 32, and the protruding portions 39e and 40e protrude forward from the lower side of the inner bumper 32.
[0022]
A roof body is provided on both sides of the base frame 33 via a side structure (not shown). A roof frame body 42 having a U-shape is fixed to the front end of the roof body. A connecting beam 44 is provided between the roof frame body 42 and the roof frame body 42. On the other hand, an outer bumper 45 having a V-shaped cross section is fixed to the outside of the inner bumper 32 with a predetermined gap in the front and rear. The outer bumper 45 has a central portion 45a and its central portion 45a in the same manner as the inner bumper 32 described above. It is composed of side portions 45b that are integrally formed to be inclined on both sides, and a plurality of holes (buckling strength changing means) 45c are formed in both side portions and both side portions 45b of the central portion 45a. A reinforcing member 46 is fixed to the upper surface portion of 45a. Between the roof frame 42 and the outer bumper 45, a pair of left and right front beams 47, 48 having an L-shaped cross section and a pair of left and right side beams 49 having a U-shaped cross section are installed. Is fixed by welding. The left and right front beams 48 and the side beams 49 are connected by a connecting beam 50, and a plurality of holes 50 a are formed in the bent portion of the connecting beam 50. Reference numeral 51 denotes a reinforcing bracket for connecting the front beams 47 and 48 to the outer bumper 45 and the floor plate 34.
[0023]
By the way, when a collision accident occurs between the rubber tire type new transportation vehicles 11, since the vehicle 11 is restrained in the left-right direction by the track, the probability of occurrence of the so-called offset collision is small, but the streamlined type is considered in consideration of the design. And is displaced (vibrated) in the vertical direction according to the road surface condition (uneven shape or slope) or driving condition (start, stop, acceleration, deceleration), etc. There is a case where the front wife part 13 and the rear wife part 14 do not function as a crash zone due to riding on the vehicle body.
[0024]
Therefore, in the present embodiment, by forming a straight portion along the vertical direction in the front portion of the front end portion 13 as a crash zone, even if the vehicles 11 are displaced up and down according to the road surface state, the driving state, etc. The straight portions having a predetermined length collide with each other to prevent the vehicle 11 from riding up, and the front end portion 13 functions reliably as a crash zone. That is, the left and right front beams 47 and 48 as constituent members constituting the front end portion 13 are inclined and curved in accordance with the streamlined design of the vehicle 11, and the lower end portion is straight along the vertical direction. Portions 47a and 48a are formed. The lengths of the straight portions 47a and 48a are set according to the amount of vertical displacement when the vehicle 11 is traveling. That is, as described above, the amount of displacement that the vehicle 11 is displaced up and down during traveling varies depending on the traveling road surface state, the vehicle 11 operating state, etc., or the vehicle body rigidity of the vehicle 11 and the performance of the suspension device. A vertical displacement amount is calculated by performing a test or calculation, and the lengths of the straight portions 47a and 48a are set according to the vertical displacement amount. In this case, if the vertical displacement amount of the vehicle 11 is L at the maximum, there is a possibility that the vehicle 11 may shift up and down by 2L at the maximum when the vehicles 11 collide with each other, so the length of the straight portions 47a and 48a should be set to be larger than 2L. That's fine.
[0025]
In addition, although the length of the straight part 48a of the front beam 48 is formed longer than the length of the straight part 47a of the front beam 47, this lengthens the straight part 48a due to the design of the vehicle 11. It has been formed, and higher safety is taken into consideration. And although the vehicle 11 is restrained in the left-right direction displacement by the track | orbit which consists of the guide wheels 21 and 22 and the guide rails 23 and 24, due to a manufacturing error, installation error, etc. of parts, it is a little left-right direction. Therefore, the widths of the straight portions 47a and 48a are also set in consideration of the shift amount.
[0026]
And the front wife part 13 is comprised by the base frame 33, each bumper 32,45, the roof frame body 42, each beam 47,48,49, etc. in this way, and the cabin 12, the front wife part 13, and the rear wife part 14 are included. The vehicle 11 is configured by attaching an FRP outer wall (not shown) to the outside of the structure formed by the framework.
[0027]
In the above description of the embodiment, the front wife portion 13 is formed on one side with respect to the cabin 12 of the vehicle 11 and the rear wife portion 14 is formed on the other side, and only the front wife portion 13 is described in detail. Has a structure similar to that of the front end portion 13, is a crash zone, and also has a straight portion. Further, although the vehicle 11 is assumed that the front wife portion 13 is forward in the traveling direction, the vehicle 11 can also travel with the rear wife portion 14 being forward in the traveling direction.
[0028]
The rubber tire type new transportation vehicle 11 configured as described above is operated unmanned, smoothly and safely by the operation management system. However, when the control device breaks down, various operation operations manually performed by the driver are performed. In this case, the traveling speed is limited to a low speed. When the driver manually operates the vehicle 11, a collision accident between the vehicles 11 may occur due to an erroneous operation or the like. Therefore, as described above, the front wife portion 13 that becomes a crash zone before and after the passenger cabin 12. And the rear end portion 14 is formed, and the straight portions 47a, 48a along the vertical direction are formed at the lower ends of the front beams 47, 48 as the constituent members constituting the front end portion 13 and the rear end portion 14, and the In addition, the front wife 13 and the rear wife 14 function as a crash zone.
[0029]
That is, when the vehicles 11 collide, the front wife part 13 or the rear wife part 14 may collide at the time of a frontal collision, or the front wife part 13 and the rear wife part 14 may collide at the time of a rear-end collision. The vehicle 11 travels with the displacement in the left-right direction substantially restricted by the guide wheels 21 and 22 and the guide rails 23, 24, but the displacement in the up-down direction is not restricted, and the vehicle body rigidity, the performance of the suspension device, the road surface It may vibrate (displace) in the vertical direction when it is uneven, on a hill, when starting, or when accelerating or decelerating. Therefore, for example, when the vehicle 11 is displaced in the opposite direction, if the vehicle 11 collides head-on and the front wives 13 collide with each other, the vehicle 11 is streamlined in consideration of the design, so that one is the other. I will get on. However, in this embodiment, since the front beams 47 and 48 of the front end portion 13 have the straight portions 47a and 48a, even if the front end portions 13 displaced in the upside down direction collide with each other, the straight portions 47a and 48a And the impact force is transmitted to the front wife portion 13 and the rear wife portion 14 through the straight portions 47a and 48a. Therefore, when the front wife 13 and the rear wife 14 are crushed as a crash zone, the impact force can be absorbed and the impact force transmitted to the cabin 12 can be reduced.
[0030]
Specifically, the impact force mitigating method by the crash zone will be described. When the front end portion 13 (rear end portion 14) is crushed as a crash zone, the impact force at the time of collision is input to the outer bumper 45 from the outer wall made of FRP. The signals are input to the front beams 47 and 48 through the straight portions 47a and 48a, and are input to the collision portions 39d and 40d (protruding portions 39e and 40e) of the buffer members 39 and 40. Then, first, the central portion 45a (reinforcing material 46) of each bumper 32, 45 is pushed and both side portions 45b are buckled in the longitudinal direction by the plurality of holes 45c, and the side reinforcing beam member 35 is formed by the plurality of holes 35c. The central reinforcing beam member 37 is deformed by buckling and bending by the front beam 37b and the connecting beam 50 by the plurality of holes 50a. Further, the buffer members 39 and 40 collide with each other and start buckling back and forth. Subsequently, the roof frame 42 and the base frame 33 start to buckle, and the entire front end portion 13 is crushed, so that the impact force at the time of collision can be absorbed.
[0031]
In this way, when the frontal collision occurs, the front wife 13 is crushed and absorbs the impact force, so that the impact force transmitted to the cabin 12 can be alleviated and the passengers and passengers in the cabin 12 can be secured safely. it can. In this case, for example, as a result of conducting an experiment in the case where a vehicle 11 having a passenger rate of about 100% and having a ton rate of 24 tons collides head-on at 11 km / h, the load acting on the cabin 12 (center of gravity position) is The conventional vehicle body structure is 4.5G and the passenger compartment 12 is deformed, but the vehicle body structure of the present invention is 3.5G and the passenger compartment 12 is not deformed.
[0032]
Further, at the initial stage of a frontal collision of the vehicle 11, due to the impact force input to the central portion 45a (reinforcing material 46) of each bumper 32, 45, both side portions 45b are buckled in the longitudinal direction by the plurality of holes 45c and the central portion 45a. Since it is displaced straight back, the impact force at the time of collision will be received and absorbed straight by the front end portion 13 without escaping to the side, and the displacement of vehicles after the collision will be prevented and the damage to the surroundings will be expanded Can be prevented.
[0033]
Further, the plurality of holes 35c are provided in the side reinforcing beam member 35, the front beam 37b of the central reinforcing beam member 37 is formed in a plate shape, and the plurality of holes 50a are provided in the connecting beam 50. The buckling of the member can be controlled and reliably received and absorbed by the front end portion 13.
[0034]
In the above-described embodiment, the straight portions 47a and 48a along the vertical direction are formed at the lower ends of the front beams 47 and 48 as the constituent members constituting the front wife portion 13 serving as a crash zone. Alternatively, the straight part may be formed on a member fixed to the front part. Further, the straight portions 47a and 48a are formed on the total of the four front beams 47 and 48, but the straight portion may be formed on at least one front beam. It is desirable that the beam is provided at the center portion in the left-right direction of 13 and a straight portion is formed on the beam so that the collision load is equally handled in the left-right direction.
[0035]
Further, in the above-described embodiment, the inner bumper 32 and the outer bumper 45 disposed along the left-right direction are applied as components disposed in a direction substantially orthogonal to the traveling direction of the vehicle in order to configure the crash zone. Although the holes 32c and 45c are used as means for changing the buckling strength, holes may be formed here by providing constituent members along the vertical direction. Instead of the holes 32c and 45c, recesses, notches, thin plate portions, etc. It may be.
[0036]
Furthermore, in the above-described embodiment, the vehicle body structure of the present invention has been described as applied to a rubber tire type new transportation vehicle. However, a general railway vehicle or automobile vehicle can also be applied.
[0037]
【The invention's effect】
As described above in detail in the embodiment, according to the vehicle body structure of the first aspect of the present invention, as a constituent member of the front end portion that becomes a crash zone that absorbs the impact force at the time of a collision provided in the front end portion of the vehicle, Bumpers having buckling strength changing means are provided on both sides which are arranged in a direction substantially perpendicular to the traveling direction of the vehicle and whose central portion protrudes forward of the vehicle and is inclined so as to spread in the vehicle width direction toward the rear of the vehicle, The buckling strength changing means is a plurality of holes formed in the both sides of the bumper along the longitudinal direction of the bumper. the impact force during the collision by deforming buckled longitudinally readily absorb it is possible to improve the safety of the vehicle. Further, it is possible to absorb the impact force upon collision with easy single and inexpensive structure.
[Brief description of the drawings]
FIG. 1 is a schematic view of a framework structure of a vehicle front end portion representing a vehicle body structure according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a schematic perspective view of a tip end portion of a frame.
FIG. 5 is a side view of the vehicle.
FIG. 6 is a front view of the vehicle.
FIG. 7 is a schematic view of a framework structure at the front end portion of a vehicle representing a conventional vehicle body structure.
[Explanation of symbols]
11 Vehicle 12 Guest Room 13 Front Wife (Crash Zone)
14 rear wife (crash zone)
32 Inner bumper 32c hole (buckling strength changing means)
33 frame 35 side reinforcing beam member 35c hole 39, 40 buffer member 45 outer bumper 45c hole (buckling strength changing means)
47, 48 Front beam 47a, 48a Straight part 50 Connecting beam 50a Hole

Claims (1)

As a component of the ex-wife portion serving as a crash zone to absorb the impact force of collision provided at the front end portion of vehicles, before Symbol protrude it is disposed in a direction substantially perpendicular to the traveling direction of the vehicle center portion to the front of the vehicle In addition, a bumper having buckling strength changing means is provided on both sides inclined so as to spread in the vehicle width direction toward the rear of the vehicle ,
The body structure according to claim 1, wherein the buckling strength changing means is a plurality of holes formed in the both side portions of the bumper along the longitudinal direction of the bumper .

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