JP2002054672A - Mobile body shock absorber - Google Patents

Abstract

(57) [Problem] To provide a shock absorber for a moving body that can reliably ensure the absorption of impact energy when colliding with an obstacle for a long time. SOLUTION: A hollow polyhedral columnar base body 7 having a plurality of side walls 11 continuous in a circumferential direction from a top end a to which an external shock is input to a mounting end b connected to an impacted body, and a long side wall having the same surface. Through holes 1 sequentially formed with a predetermined width p along the direction
3 and a mounting portion w2 which is brought into contact with the plurality of side wall surfaces 11 on the mounting end b side and is welded to the side wall surface 11 at the positions of the welding holes 13 formed in the abutting portions, and is coupled to the impacted body. The through-hole 13 is removed at least from a region exceeding the predetermined width p from the mounting end b of the base 7 toward the top end a to form the rigidity enhancement portion A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber for a moving body which absorbs the collision energy applied to the moving body which is the object to be impacted at the time of the collision of the moving body and which can reduce the impact applied to the moving body and the opposing object. Related to the device.

[0002]

2. Description of the Related Art A moving body, for example, a truck may collide with an obstacle during traveling or may receive a side collision from another vehicle.
In such a case, in order to protect the occupant and the load, or to protect the oncoming vehicle, a shock absorber may be used to support the outer peripheral wall components of the vehicle. For example, a bumper of a vehicle and a side guide bar for preventing the entanglement of an object from the side are attached to a side frame or a cross member forming a base of the vehicle via a shock absorber, and input is performed through the bumper or the side guide bar. The shock absorber itself absorbs the impact energy by the collapse accompanied by the plastic deformation by the impact force, thereby reducing the impact.

[0003] For example, a shock absorber disclosed in Japanese Utility Model Publication No. 2-49402 has a plurality of through holes formed in the side wall surface of a hollow polyhedral columnar base in order along the longitudinal direction of the base, and a plurality of adjacent through holes are formed. Notches are sequentially formed in the corners located between the side wall surfaces along the longitudinal direction of the base. These through-holes and notches allow the continuous buckling deformation to absorb the impact, thereby exhibiting the function of ensuring the absorption of the impact energy. In addition, the notch hole on the top end side is made larger than the mounting end side, causing buckling deformation relatively early, effectively reducing the maximum acceleration / deceleration at the time of collision, and ensuring protection of the occupant and the load. Like that.

[0004]

By the way, the shock absorber has a hollow polyhedral pillar-shaped base, on which an impact input member such as a bumper is attached at the top end, and a mounting plate portion is formed extending from the mounting end of the base. The part is integrally connected to a side frame or a cross member on the vehicle body side. Such a shock absorber receives bending stress in a concentrated manner over a long period of time by repeating vertical vibration with the bumper attached to the top end of the base, and especially in the vicinity of the mounting end of the base, compared to the bumper vibrating vertically. It will be subjected to extremely large bending stress for a long time. For this reason, the shock absorber degrades over time due to long-term use,
When the rigidity is reduced and the object collides with an obstacle, the portion near the mounting end of the base is bent due to the reduced rigidity, and buckling deformation does not occur at the position of each through hole from the top end toward the mounting end, so that the base is continuous. It falls into a state where the function of securing the absorption amount of the impact energy due to the buckling deformation cannot be exhibited.

Further, instead of extending the mounting plate portion at the mounting end of the shock absorber, a structure is adopted in which a polygonal mounting plate is brought into contact with and welded to the mounting end. A state in which bending deformation occurs first in the welded part when it collides with an obstacle due to early deterioration of the welded part, and the function of securing the absorption of impact energy due to continuous buckling deformation cannot be exhibited. Fall into SUMMARY OF THE INVENTION The present invention is based on the above-described object, and is intended for a mobile body capable of reliably securing the rigidity of the mounting end side of a base for a long period of time and ensuring the absorption of impact energy at the time of collision with an obstacle for a long period of time. It is an object to provide a shock absorber.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a side wall surface extending from a top end to which an external impact is input to a mounting end connected to an impacted body is formed in a circumferential direction. A plurality of hollow polyhedral columnar base bodies, through holes formed in the side wall surface in a predetermined width along the longitudinal direction of the surface, and a plurality of side wall surfaces on the mounting end side in contact with the plurality of side wall surfaces. A mounting frame welded to the side wall surface at a position of the welding hole formed in the mounting body and formed with a mounting portion to be coupled to the impacted body. In the region exceeding the predetermined width, the above-mentioned through hole is eliminated and a rigidity reinforcing portion is formed. The contact portions of the mounting frame are brought into contact with the plurality of side wall surfaces on the mounting end side of the base, welded to the side wall surfaces at the positions of the welding holes formed in the contact portions, and further formed sequentially on the mounting end side of the base. By removing the through hole from the area exceeding the predetermined width of the through hole and forming the rigidity enhancement part, the rigidity of the rigidity enhancement part itself can be enhanced, and the impact load transmitted to the rigidity enhancement part side from the top end is welded hole. In addition to passing through the welding portion, the power is transmitted to the mounting frame through the contact portion between the side wall surface and the mounting frame, and further transmitted to the impacted body coupled to the mounting portion of the mounting frame. For this reason, the rigidity enhancement portion of the base body itself and the joint portion between the rigidity enhancement portion and the mounting frame can ensure durability for a long period of time, and even at the time of collision with an obstacle after long-term use, the base side of the base body can be used. By preventing bending deformation of a certain stiffening portion, it is possible to ensure the absorption of impact energy due to continuous buckling deformation of the base, and to reliably protect the occupant and the load over a long period of time.

According to a second aspect of the present invention, the through holes are formed to be long toward each corner located on both sides of the side wall surface, and are formed sequentially at a pitch of a predetermined width along the longitudinal direction of the side wall surface. It is a hole. In this case, the interval between each elongated hole and each corner portion is relatively small, stress concentration occurs, buckling deformation is likely to occur, and a relatively stiffened portion having a relatively high rigidity is moved from a relatively low rigidity top end. Buckling deformation is sequentially and reliably generated at the stress concentration portion facing each through hole to be provided, and the shock absorbing function due to stepwise buckling deformation is stabilized. Preferably, notch holes which become gradually smaller from the top end toward the root portion may be sequentially formed in corner portions located between the adjacent side wall surfaces. in this case,
The rigidity of the top end side of the base can be reliably made smaller than that of the mounting end side, buckling deformation can be started on the relatively rigid top end side, and the relatively rigid mounting end can be sequentially buckled and deformed. As a result, it is possible to secure the amount of impact energy absorbed by the dynamic buckling deformation, and to reliably protect the occupants and the load over a long period of time.

[0008]

1 and 2 show a shock absorber for a moving object according to an embodiment of the present invention. The shock absorbing device for a moving object is mounted on a truck 1 as a moving object. The track 1 has a pair of side frames 2 long before and after forming the base.
The cross member 3 is integrally connected to the tip of the cross member 3, and a pair of left and right shock absorbers 4
The bumper 5 is attached via the. In addition, side guide bars 9 are mounted on the left and right side surfaces of the pair of side frames 2 via a plurality of shock absorbers 4 'to prevent an object from being entangled from the side of the vehicle body. Note that the plurality of shock absorbers 4 ′ for attaching the side guide bar 9 include a bumper 5.
The shock absorber 4 for mounting a bumper is mainly described here because it has the same configuration as that of the shock absorber 4 for mounting, except that the overall length is different.

The bumper 5 has a main body 501 which is a curved bar-shaped member extending in the vehicle width direction Y, and a connecting bracket 502 is integrally connected to a back surface of the main body 501, and a rear portion of the connecting bracket 502 is fitted (see FIG. 3). And v. Elastic frames 6 which are vulcanized and bonded to each other. The elastic frame 6 has a pair of left and right thick portions 601 and a central connecting portion 602 for connecting the thick portions 601 to each other, and these are integrally formed.
The pair of left and right shock absorbers 4 have the same configuration, and the respective ends are connected to the thick portion 601 and the mounting end on the root side is connected to the cross member 3.

As shown in FIGS. 1 and 3, the shock absorber 4 has a hollow pyramid-shaped base body 7 extending forward in the vehicle body as a whole, a square plate-shaped top plate 8 welded to the top end a thereof, and a mounting member. And a mounting frame 14 welded to the end b. Base 7
Is formed by pressing a steel plate with a predetermined thickness into a pyramid shape.
Butting ends (not shown) are welded to each other and include four vertically long side wall surfaces 11 that are continuous from the top end a to the mounting end b, and four corner portions 12 located between the adjacent side wall surfaces 11. As shown in FIG. 4A, the top plate 8 is formed by pressing a steel plate into a square plate shape.
A bolt hole h0 is formed at the corner, and is screwed to a core metal (not shown) in the thick portion 601 by a bolt (not shown) inserted into this hole.

The four side walls 11 provided in the circumferential direction of the base 7 are provided with through holes 13 at a predetermined pitch p along a side wall center line L1 extending in the longitudinal direction (the left-right direction in FIG. 3) of each surface. It is formed. As shown in FIGS. 3 and 6A, each through hole 13 is formed to be long toward both corner portions 12 located on both sides of each side wall surface 11, and is formed in a shape of a narrow hole whose center is narrow. The interval between the non-hole portion between the edge g of the through hole 13 in the longitudinal direction of the hole (the vertical direction in FIG. 6A) and each corner portion 12, that is, the interval B1 in the direction orthogonal to the center line L1 of the side wall surface is As shown in FIGS. 6A and 7, a similar through hole 13 is formed in the side wall surface 11 adjacent thereto, and a gap between the edge g of the through hole and the corner portion 12 is formed. Similarly, the interval B1 between the non-hole portions also becomes smaller.

As described above, through holes 13 which are long in the direction orthogonal to the side wall center line L1 are formed in all four side wall surfaces 11,
Stress concentrates on the non-holes between the through-holes 13 and the corners 12 so that buckling deformation is likely to occur at these stress concentrated parts. Further, each through-hole 13 forms a top edge 131 that is bent outward and extends outward (upward in FIG. 6B) at the facing portion on the top end a side of the base 7, and faces inward at the facing portion on the mounting end b side. A base end 132 is formed to bend and extend (downward in FIG. 6B), and the top end 131 and the base end are formed as shown in FIGS. Edge 1
32 is formed so as to maintain a predetermined gap t1. Therefore, when buckling deformation occurs in a non-hole portion between the edge g of the through hole 13 and the corner portion 12, the top edge 131 on the top a side can be guided to the outside of the base edge 132 (FIG. 6
(See arrow j in (b))), the input load can be sequentially and reliably transmitted to the mounting end b, thereby facilitating continuous buckling.

Further, as shown in FIG. 3, the pitch p between the through holes 13 is reduced by 1 /
Notched holes 15 are sequentially formed at two shifted positions in the middle between the adjacent through holes 13. Moreover, the notch hole 15 has a bent opening and is formed by drilling before bending the corner portion 12. Further, the notch holes 15 are formed so as to gradually decrease from the top end a in the direction of the center line L1 of the side wall surface toward the mounting end b. In this case, four notch holes 15 having different sizes are formed in each corner portion 12. Each is formed. The notch hole 15 closest to the top end a is formed with a predetermined width i with respect to the top end a. Moreover, the through hole 13 closest to the top end a is formed with a top end interval p ′ substantially equal to the pitch p with respect to the top end a. For this reason,
Since the notch hole 15 and the through hole 13 are not formed at least in the neck portion n having the predetermined width i from the vicinity of the top end a of the base 7, the rigidity of the portion is improved.

On the other hand, the through hole 13 near the root facing the mounting end b is formed with a root spacing pa larger than the pitch p with respect to the mounting end b. That is, the mounting end b
No through holes 13 are formed in the four side wall surfaces 11 on the side in the region of the root interval pa toward the top end a. Moreover, the notch 15 of the corner 12 is not formed. Thereby, a rigidity enhancement portion A for enhancing rigidity is formed. Moreover, the attachment frame 14 is attached to a portion on the attachment end b side of the rigidity enhancement portion A.

As shown in FIGS. 3 and 5, the mounting frame 14 is formed by combining four angle members having an L-shaped vertical section into a rectangular frame shape.
It is formed by welding the butted ends of each other. Each contact piece w1 of the mounting frame 14 facing each side wall surface 11 of the rigidity strengthening portion A abuts on the overlapping area f (see FIG. 3) of the rigidity strengthening portion A with a predetermined width from its mounting end b. An elongated hole h1 is formed, and is welded to the side wall surface 11 of the rigidity enhancement portion A at the position of the elongated hole h1. Further, the mounting piece w2, which is bent from the contact piece w1 and extends outward, is overlapped with the cross member 3 (see FIG. 3), and is provided in a plurality of bolt holes h2 (see FIG. 4B). It is fastened to the cross member 3 by bolts (not shown) inserted.

[0016] Such a shock absorber 4 for mounting a bumper.
Vibrates due to road surface reaction force when the vehicle is running,
The relatively heavy bumper 5 fastened to the top plate 8 on the front end side is greatly displaced by vertical vibration, and bending stress is concentrated and applied to the neck n of the base 7 supporting the bumper 5, and Also, a large bending stress is concentrated and applied to the rigidity enhancement portion A. In this case, since the notch hole 15 and the through hole 13 are removed from the neck portion n and the rigidity enhancement portion A, the rigidity of the same portion is sufficiently enhanced, and the rigidity of the base 7 can be sufficiently ensured for a long time.

[0017] Such a buffer device 4 for mounting a bumper.
When the truck equipped with collides with an obstacle and the bumper 5 receives an impact, the impact is applied in the longitudinal direction of the base 7 of the shock absorber 4, and at this time, the stiffening portion A is sufficiently stiffened. Therefore, no bending displacement occurs at this part,
Buckling deformation occurs relatively early in a non-hole portion between the edge g of the through hole 13 and the corner portion 12 provided on each of the four side wall surfaces 11 on the top a side having the smallest rigidity. At this time, of the notch holes 15 in the corner portion 12, the one near the top end a was made the largest opening, so that the top end a
The rigidity in the vicinity of the through hole 13 in the vicinity was relatively reduced, and the early buckling deformation in the same portion could be made easier.

As described above, the maximum deceleration at the time of collision can be effectively reduced, and the protection of the occupant and the load can be ensured. Moreover, the impact energy that is not absorbed by this initial buckling is
Sequentially, stepwise, successively buckling deformation in the vicinity of the through holes 13 provided in the four side wall surfaces 11 arranged sequentially from the top a side to the mounting end b side, is sequentially absorbed, The collapse of the buffer member 4 is completed. In this manner, the cushioning member 4 can sufficiently exhibit the function of securing the absorption amount of the impact energy received by the bumper 5 due to its collapse, and can also protect the occupants of the truck and the load, and also protect the opposed object. Can be ensured for a long time.

In the above, the shock absorber 4 for mounting the bumper has been described. However, the shock absorber 4 'for mounting the side guide bar 9 has the same function and effect when receiving an impact from the side guide bar 9. Can demonstrate. Further, although the truck has been described as a moving body, the present invention can be similarly applied to various types of vehicles such as buses and tractors and other shock absorbers of the moving body, and the impact received by the outer wall constituent members of each moving body can be applied. The same operation and effect can be obtained by receiving with the shock absorber applied to the present invention.

[0020]

As described above, according to the first aspect of the present invention, the rigidity of the rigidity enhancing portion itself of the base can be enhanced, and in addition to the impact load passing through the welding portion of the welding hole, it can be attached to the side wall surface. Since the power is transmitted to the mounting frame through the abutting portion of the frame, the rigidity enhancement portion of the base body and the joint portion between the rigidity enhancement portion and the mounting frame can ensure the durability for a long period of time. Even in the event of a collision, it is possible to prevent bending deformation of the rigidity enhancement part, which is the root side of the base, to secure the amount of impact energy absorbed by continuous buckling deformation of the base, and to protect occupants and loads. Can be ensured for a long time.

According to the second aspect of the present invention, since the through hole is a long hole, the interval between each long hole and each corner portion is relatively small, stress concentration occurs, and buckling deformation is likely to occur. Buckling deformation is ensured one after another at the stress concentration part facing each through hole provided toward the relatively rigid stiffening part from the low rigid top end side, stabilizing the shock absorption function by stepwise buckling deformation I do.

[Brief description of the drawings]

FIG. 1 is a schematic cutaway plan view of a truck to which a shock absorber for a moving body is attached as an embodiment of the present invention.

FIG. 2 is an overall schematic plan view of the track of FIG.

FIG. 3 is a side view of a shock absorbing device used by the moving object shock absorbing device of FIG. 1;

4 is a partial view of the shock absorber of FIG. 3, (a) showing a plan view of a top plate, and (b) showing a bottom view of a mounting frame.

FIG. 5 is a perspective view of a mounting frame used by the shock absorber of FIG. 3;

6 shows a through hole of the shock absorber of FIG. 1, (a) is an enlarged plan view of the through hole, and (b) is an enlarged sectional view of a side wall of the base near the through hole.

FIG. 7 is a perspective view of the shock absorber of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 track 2 side frame 3 cross member 4, 4 'shock absorber 5 bumper 7 base 11 side wall surface 12 corner portion 13 through hole 14 mounting frame a top end b mounting end p predetermined width w2 mounting portion A rigidity strengthening portion

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroaki Hayashida 4-21-1, Shimomaruko, Ota-ku, Tokyo F-term in Mitsubishi Automotive Engineering Corporation (reference) 3J066 AA02 AA23 BA03 BB01 BC01 BF02 BG05

Claims (2)

[Claims] A hollow polyhedral columnar body having a plurality of circumferentially extending side walls extending from a top end to which an external impact is input to a mounting end connected to an impacted body, and a longitudinal direction of the hollow side surfaces being the same as the side walls. And a plurality of through holes sequentially formed with a predetermined width along the plurality of side walls at the mounting end and welded to the side wall surfaces at positions of the welding holes formed at the abutting portions. A mounting frame having a mounting portion to be coupled to the impact body, wherein the rigidity enhancing portion is formed by removing the through-hole at least in a region which is closer to the top end than the mounting end of the base and exceeds the predetermined width. A shock absorber for a moving object. 2. The moving body shock absorber according to claim 1, wherein the through hole is formed to extend toward each corner located on both sides of the side wall surface, and has a predetermined width along the longitudinal direction of the side wall surface. Characterized in that they are elongated holes sequentially formed at a pitch of 1 mm.