JP3543939B2 - Garnish structure - Google Patents

Description

[0001]
[Industrial technical field]
The present invention relates to a garnish structure having a shock absorber, and more particularly to a garnish structure having a shock absorber capable of improving shock absorption characteristics and achieving easiness of molding and stabilizing quality.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a garnish made of resin is attached to an automobile to decoratively cover the indoor side of a vehicle body panel. Between the inner surface side of the garnish and the cabin side of the vehicle body panel, a resin shock absorber integrally or separately formed with the garnish is provided to improve safety for occupants. I have.
[0003]
An example of this type of garnish is disclosed in Japanese Patent Application Laid-Open No. 10-226284. The garnish disclosed in the publication is composed of a resin composition containing an ethylene / propylene copolymer as a main component, and an inner surface portion of the garnish main body is provided with a resin composition also containing an ethylene / propylene copolymer as a main component. A lattice-shaped shock absorber having a thickness of about 1 mm is integrally provided. According to this configuration, the interior material can have flexibility that is hardly damaged on the surface, and the impact absorber absorbs impact energy at the time of collision by plastically deforming by buckling without breaking.
[0004]
Furthermore, according to the conventional garnish, since the lattice-shaped shock absorber is formed by intersection of a plurality of vertical planes, it is extremely easy to process a mold for forming a lattice part, and Can be manufactured at low cost.
[0005]
In addition, for example, Japanese Patent Application Laid-Open No. 10-203279 discloses a grid-like resin shock absorber interposed between a vehicle body panel on the passenger compartment side and a garnish main body. The shock absorber disclosed in the publication has a plurality of substantially rectangular plate-like transverse ribs extending parallel to each other along one direction of the garnish main body, and a substantially rectangular elongated rod shape that can be sheared by impact force. And vertical ribs. The vertical rib includes first and second vertical ribs integrally formed at predetermined left and right side edges of the horizontal rib on the vehicle body panel side and the garnish body side.
[0006]
In this conventional shock absorber, when an impact force is applied to the garnish main body, a tensile force acts on the point of action on the second vertical rib disposed on the garnish main body side, and a plurality of the horizontal ribs are applied to the plurality of horizontal ribs. Is subjected to a bending force. When the impact force is further applied to the garnish main body, the tensile force is increased on the second vertical rib, and the second vertical rib is sheared near the point of application of the impact force. The impact load at the time of shearing of the second vertical rib acts on each of the second vertical ribs cut right and left, and the impact load acting on each of the second vertical ribs is the horizontal rib connected to the second vertical rib. , The lateral ribs buckle or collapse.
[0007]
Since this conventional shock absorber is configured to induce each deformation mode that causes buckling following pulling and shearing by the impact force, it is relatively more than a single buckling-only shock load. It is stated that since the impact value is low, the damage value can be reduced, and the impact can be efficiently absorbed.
[0008]
[Problems to be solved by the invention]
By the way, in the garnish disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-203279, the lattice portions of the shock absorber arranged vertically and horizontally like a grid so as to stand on the garnish main body have a pair of parallel vertical ribs. And a pair of horizontal ribs intersecting to connect the vertical ribs and an inner surface of the garnish main body defined by the vertical and horizontal ribs form a plurality of bottomless box shapes that are integrally continuous.
[0009]
According to this configuration, when a strong impact is applied to the garnish, the lattice portion integrally formed of the same material as the garnish is crushed so as to buckle and absorbs the impact. When the object does not strongly collide with the surface of the garnish, the lattice portion elastically deforms to absorb the impact.
[0010]
However, since the lattice portion of this shock absorber is simply continuous while the adjacent single other lattice portions share a rib, the rigidity with respect to the impact tends to be high, The overall impact strength is extremely high. In other words, in the event of a strong impact, the vertical and horizontal ribs are almost continuously buckled, and the garnish main body is likely to be in a state of hitting the bottom of the vehicle body panel until the predetermined amount of deformation is reached. Therefore, there remains a problem that the load rapidly increases, the effective impact load stroke is shortened, and the impact absorption efficiency is deteriorated.
[0011]
Therefore, if a material having low rigidity is used as the shock absorber, the degree of deformation due to the shock increases, and the amount of deformation increases, but the rise of the initial load deteriorates. Deformation that does not contribute to the increase.
[0012]
On the other hand, in the garnish shock absorber disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 10-203279, as described above, four longitudinal ribs each having a substantially rectangular elongated rod shape capable of being sheared by an impact force have a substantially rectangular plate shape. The plurality of lateral ribs are integrally formed in a skewered manner at predetermined intervals. This is because a relatively lower impact value can be obtained than an impact load that causes only buckling, such as the garnish disclosed in Japanese Patent Application Laid-Open No. 10-203279. That is, as shown in FIG. 7, an initial load at the time of impact is absorbed halfway, and a desired amount of deformation is secured while maintaining this load to obtain an ideal load-stroke characteristic. That's why.
[0013]
However, according to this configuration, at the time of impact, the second vertical rib disposed on the pillar garnish side is sheared only when the bending force is applied to the plurality of horizontal ribs, and after the shearing, the second vertical rib is disposed. Since the ribs are connected and crushed, the horizontal ribs themselves need to have an extremely rigid structure.
[0014]
In a case where such a shock absorber is integrally formed of synthetic resin, a suddenly wide and narrow cross section is formed at a resin confluence of the first and second vertical ribs from the horizontal ribs based on the structure of a molding die. Due to the change, two or more flows of the resin in the mold do not completely fuse, and a linear unevenness occurs at the junction. In other words, in this conventional shock absorber, the merging portion (weld) of the resin in the molded body having the lattice-shaped crossing portions of the ribs is significantly more mechanical than other portions where the merging portion does not occur. It has the disadvantage that strength is reduced.
[0015]
Moreover, in this conventional shock absorber, the cross section of the first and second vertical ribs is extremely smaller than that of the horizontal ribs, and the resin confluence of the vertical ribs between the horizontal ribs is the same as the intermediate portion of the ribs. Is formed at an indefinite portion, so that it is extremely difficult to obtain a required load-stroke characteristic as designed, and there are many problems in putting the product into practical use.
[0016]
The present invention has been made to solve such a conventional problem, and a specific object of the present invention is to provide a shock absorber disposed between a garnish main body that covers a vehicle body panel on the passenger compartment side and the vehicle body panel. It is an object of the present invention to provide a garnish structure in which shock absorbing characteristics are made close to ideal ones, the characteristics can be easily adjusted, and a stable quality can be easily manufactured.
[0017]
Means for Solving the Problems and Functions and Effects
In order to achieve the above object, the invention according to claim 1 is a garnish structure that covers a vehicle body panel on a passenger compartment side, and a garnish body that covers the vehicle body panel, and a garnish body between the garnish body and the vehicle body panel. And a plurality of first ribs arranged along opposing side edges of the main body thereof, and a plurality of first ribs connecting between the plurality of first ribs. And two ribs, wherein the second ribs Among the plurality of first ribs At least some Adjoin Between the first ribs Opened Having a rectangular opening, Adjoin Between the first rib and the opening Around the opening of the opening, A garnish structure having a rupture portion that is ruptured by an impact at the time of a collision.
[0018]
Now, according to the shock absorber of the present invention, when the impact at the time of collision is applied to the surface of the garnish main body and the garnish main body is deformed, the plurality of first ribs and the second rib abut on the vehicle body panel. The strut then bends greatly while absorbing the impact of the collision and begins to deform.
[0019]
When an even greater impact force is applied, the second ribs are eventually pulled in multiple directions, so that the openings between the first ribs are widened, and at the same time, the tearing portions formed on the periphery of the openings. The above-mentioned tensile force acts on the same, and a tear is generated in the split part. The tearing of the tearing portion increases the degree of freedom of each of the first ribs, making the first ribs more easily deformed and receiving most of the subsequent impact load. The subsequent impact load is largely absorbed and suppressed to a substantially constant impact load. Finally, the first and second ribs are completely buckled and plastically deformed due to significant crushing at the time of impact.
[0020]
For this reason, as compared with a conventional shock absorber in which the first and second ribs are integrally formed continuously in a grid over the entire length, a configuration in which the first and second ribs are formed only by vertical and horizontal grid-like ribs is used. There is no immediate buckling that bottoms out on the body panels.
[0021]
Therefore, according to the present invention, the load is rapidly increased to a predetermined load before the tearing portion of the second rib breaks, and when the tearing portion subsequently breaks, the load is stably reduced. , And a predetermined amount of deformation can be ensured. Therefore, a predetermined amount of deformation can be ensured while maintaining the load increased to a predetermined load at the time of the impact, so that the impact can be effectively absorbed and the safety of the occupant can be sufficiently ensured.
[0022]
In addition, when the cut portion is formed integrally with the first and second ribs, it can be treated as a small variation in the flow cross section in resin processing. By filling the resin into the relatively narrow second rib from the first rib having a wide flow cross section as in the related art, it is possible to make a structure that does not cause a wide change such as sharply narrowing the flow cross section of the resin. A predetermined impact absorption characteristic as designed can be obtained without causing a significant change in strength at the resin confluence (weld).
[0023]
The invention according to claim 2 utilizes the fact that the opening has a corner portion, and the portion of the tearing portion that generates a tear due to the impact at the time of collision is located near the corner of the opening portion. Of the second rib portion. That is, the tearing portion is provided in a part of the second rib near the corner of the opening. In addition, as the said tearing part in this invention, the site | part which is going to tear the opening periphery which is a part of the 2nd rib extended between the said opening and the said 1st rib is another. By setting the thickness to be thinner than the part, the tearing part can be positively formed. In this case, the strength of the cut portion can be appropriately selected depending on its thickness.
[0024]
Now, in the invention according to claim 2, when an impact at the time of a collision is applied to the surface of the garnish main body, a crack is generated near the corner of the opening due to a significant deformation at the time of the impact, and It breaks while absorbing the impact of the collision at the corner. When an impact is applied to the surface of the garnish body, the second rib of the shock absorber abuts the back surface of the garnish body. At this time, an opening between the first ribs is formed in the second rib, and the first rib existing corresponding to the peripheral edge of the opening does not receive the restraining force of the second rib. Therefore, when the second rib abuts on the back surface of the garnish main body, the first rib can be bent by an initial impact load to obtain a predetermined deformation characteristic. Then, the corner portion is torn and the rise of the impact value up to the bottom contact is suppressed, so that a more ideal impact absorption characteristic can be obtained. The rising characteristic of the impact value when the initial load is absorbed can be controlled by changing the opening area of the opening.
[0025]
Further, in the present invention, the openings may be provided for each lattice unit of the lattice part composed of the first and second ribs, and are dispersed in each lattice part for preferable characteristics of the shock absorber. May be formed. In addition, the tearing portion may be provided for each of the lattice units, and a mode in which the tearing portion is not formed in some of the lattice portions may be adopted. Based on the statistical collision frequency distribution in the garnish body, depending on whether the garnish body is in a longitudinal direction, a width direction or a simple surface, or a corner portion, the arrangement, number, width, thickness, etc. Can be appropriately selected.
[0026]
Therefore, the initial load at the time of impact can be increased to a predetermined impact value by appropriately setting the opening area of the opening and the arrangement, thickness, number, and the like of the tearing portion, and this impact value can be increased. An effective shock absorbing stroke can be ensured in the state maintained.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the accompanying drawings.
1 to 5 show a typical embodiment of the present invention. FIG. 1 is a perspective view of a pillar garnish viewed from a vehicle body panel side, and FIG. 2 shows a state in which the pillar garnish is mounted on a vehicle body panel. FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 1, FIG. 3 is a perspective view of the shock absorber viewed from the passenger compartment side, FIG. 4 is an enlarged sectional view taken along the line BB of FIG. 3, and FIG. FIG. 4 is a partial perspective view showing a part of the shock absorber that is sometimes deformed. In the present embodiment, an upper center pillar garnish covering the upper half of the center pillar of the vehicle body will be described as an example.However, the present invention is not limited to this, and for example, a front pillar, a roof, a door, etc. The present invention can also be applied to various interior parts that are decoratively mounted on the vehicle body panel on the vehicle interior side.
[0030]
In FIGS. 1 and 2, reference numeral 10 denotes an upper center pillar garnish that is attached so as to cover the upper half of the center pillar 1 on the passenger compartment side. The pillar garnish 10 includes a resin garnish body 11 that covers the pillar 1, a resin shock absorber 12 that absorbs an impact load when an external impact is applied, a shock absorber 12, and the garnish body 11. And a slide plate 13 made of resin having a substantially H-shaped cross-section and slidably disposed therebetween.
[0031]
The garnish body 11 is made of a polypropylene resin material formed by injection molding, and the entire garnish body 11 has a curved shape that is gently curved from one end to the other end in the longitudinal direction. According to the illustrated example, the garnish main body 11 is bent in the same direction on both sides along the longitudinal direction of the substantially planar main body to form a pair of side wall portions 11a and 11a opposed to each other. It has a U-shaped opening cross section structure. At the lower end of the garnish main body 11, an overlapping portion 11b that fits inside a center pillar lower garnish (not shown) that covers a vehicle body panel (not shown) extends with a step.
[0032]
The garnish main body 11 is formed with a substantially rectangular opening 11c for adjusting the height position of the seat belt adjuster 2 serving as an upper fulcrum of a three-point seat belt (not shown). The opening 11c is closed by a slide plate 13 in which a substantially rectangular insertion hole 13a for inserting the seat belt adjuster 2 is formed. The slide plate 13 is made of a thin plate made of an elastomer-modified polypropylene resin material formed by injection molding, and is slidably mounted in the longitudinal direction together with the seat belt adjuster 2.
[0033]
On the opposing surface of the side walls 11a, 11a of the garnish main body 11, three short convex engaging claws 11d having substantially triangular sides are projected at predetermined intervals in the longitudinal direction. Three concave notches 12a,... 12a provided at the outer edge of the shock absorber 12 at the same intervals as the installation positions of the engaging claws 11d are locked and fixed to the engaging claws 11d, respectively.
[0034]
At the back surface along the longitudinal direction of the opening 11c of the garnish main body 11, mounting bosses 11e and 11e 'for forming the shock absorber 12 are formed so as to protrude, respectively. The mounting pieces 12b and 12c formed on the shock absorber 12 are fixed to each other by a speed nut or a heat caulking (not shown). Further, an elastic clip (not shown) for mounting a vehicle body pillar is mounted on the garnish main body 11 at a substantially central portion of an upper end thereof along the mounting boss 11e.
[0035]
The pillar garnish 10 assembled as described above covers the flange portions 1a 'and 1b' of the center pillar inner panel 1a shown by the two-dot chain line and the center pillar outer panel 1b partially omitted in the drawing as shown in FIG. The door opening trim 3 is attached so as to surround the door opening trim 3 in a state where the door opening trim 3 is in contact with an inside of a door panel (not shown) in the vehicle longitudinal direction. The trim 3 includes a seal portion 3a made of hollow rubber for sealing by being compressed in the vehicle interior direction, and a fitting portion 3b having a substantially U-shaped cross section which is integrally formed with the seal portion 3a by extrusion molding.
[0036]
A space 4 having a predetermined space is formed between the pillar garnish 10 and the inner panel 1a. A rail portion 2a for guiding the seat belt adjuster 2, which is movable up and down, is disposed in the space portion 4. The rail portion 2a is a three-point seat belt (not shown) mounted on the seat belt adjuster 2. Upper supporting portion.
[0037]
Next, the structure of the shock absorber 12 which is a feature of the present invention will be specifically described. In the present embodiment, the shock absorber 12 is fixed to the garnish body 11, but the present invention is not limited to this, and includes fixing to the vehicle body panel.
[0038]
The shock absorber 12 in this embodiment, which is attached to the back surface of the garnish main body 11, is composed of a long member integrally formed by, for example, injection molding a polypropylene resin material. The shock absorber 12 includes a substantially planar main body 12d and a pair of left and right lattice parts 12e, 12e protruding to the back side from one end to the other end along both side edges in the width direction of the main body 12d. Have.
[0039]
The shape of the shock absorber 12 is formed along the rear surface of the garnish body 11, and both side portions of the shock absorber 12 are curved in the same direction as the garnish body 11. As shown in FIG. 2, the set dimension interval of one of the lattice sections 12 e in the vehicle longitudinal direction is set to a dimension different from that of the other lattice section 12 e. According to the illustrated example, the set dimension interval of the grid portion 12e disposed on the front side in the vehicle body traveling direction is set slightly longer than that on the rear side in the vehicle body traveling direction.
[0040]
As shown in FIG. 3, a guide concave portion having a vertically long concave shape that guides the movement of an elongated plate-shaped slide plate 13 that closes the opening 11 c of the garnish main body 11 is provided at a substantially central portion of a main body portion 12 d of the shock absorber 12. 12f is formed. The guide concave portion 12f has a curved shape warped with respect to the slide plate 13, and is set wider than the set width dimension of the slide plate 13. The guide concave portion 12f is provided with a substantially rectangular insertion opening 12g for moving the seat belt adjuster 2 up and down at an intermediate portion corresponding to a set position of the substantially rectangular opening 11c of the garnish main body 11. .
[0041]
The guide concave portion 12f has an elongated plate-like mounting piece 12b extending in the same direction and bent stepwise toward the garnish main body 11 at the upper end edge in the longitudinal direction. The piece 12b is provided with a mounting hole 12b 'which is inserted and fixed to the upper end side mounting boss 11e of the garnish body 11. A substantially L-shaped mounting piece 12c is formed at a lower end of the shock absorber 12 so as to be substantially equal to a setting height of the mounting piece 12b via a step portion and protruded toward the garnish main body 11; The mounting piece 12c is provided with a mounting hole 12c 'that is inserted into and fixed to the lower end side mounting boss 11e' of the garnish body 11.
[0042]
The grid portion 12e of the shock absorber 12 includes a pair of left and right second ribs 12j extending from one end to the other end along opposite side edges of the main body portion 12d, and a width direction of the second rib 12j. A plurality of first ribs 12i,..., 12i, 12i are connected at substantially right angles along the inner surface side. Each of the pair of left and right second ribs 12j is made of a substantially L-shaped curved plate material, and one side edge of each is integrated with the left and right sides of the main body 12d. The first rib 12i is made of a substantially L-shaped plate material having the same shape as the substantially L-shaped curved shape of the second rib 12j. The first rib 12i is provided on the inner surface of the second rib 12j at a predetermined interval along the longitudinal direction of the main body 12d. Are arranged in parallel with each other. In the present embodiment, the first ribs 12i are arranged in parallel with the inner surface of the second rib 12j. However, the present invention is not limited to this, and a plurality of the first ribs 12i may be provided on the inner surface of the second rib 12j. So-called honeycomb-shaped rib structure surrounded by a triangular, pentagonal, or hexagonal polygonal shape.
[0043]
In the present invention, the most characteristic portion is that a part of the second rib 12j has a rectangular opening 12h between the first ribs 12i, and the opening 12h and the first There is a tearing portion 12k between the rib 12i and the rib 12i that is torn by an impact at the time of collision. Assuming that the lattice portion 12e having two adjacent first ribs 12i and the second rib 12j connected between the first ribs 12i is one lattice unit, one or more lattice units 12e are provided. One opening 12h is formed for each. Here, in the following description, the first rib is referred to as a vertical rib, and the second rib is referred to as a horizontal rib.
[0044]
As shown in FIG. 3, a rectangular opening peripheral portion (opening peripheral edge) 12h 'of an opening 12h formed in a part of the lateral ribs 12j is located between the opening 12h and the vertical rib 12i. Extends. Therefore, in the present embodiment, between the adjacent vertical ribs 12i, the horizontal ribs 12j have a rectangular window frame shape that is open at the center and curved outward. Further, according to the present invention, a portion of the lateral rib 12j in the peripheral portion 12h 'of the lateral rib 12j is a tear portion 12k which is torn by an impact at the time of collision, and the tear position is the same as the tear portion. There are four corners 12m of 12k, and a tear is generated by the impact at the time of the collision at the same tearing position.
[0045]
Now, when an impact is applied to the garnish body 11 in the direction of arrow F shown in FIG. 2 and the garnish body 11 is deformed, the impact is absorbed through the garnish body 11 as shown in FIG. Acts on body 12. In the shock absorber 12, both the vertical ribs 12i and the horizontal ribs 12j abut against the center pillar 1 to protrude, and while absorbing the impact of the collision, the vertical ribs 12i are greatly curved as shown by the chain line. To start the transformation.
[0046]
In this bending stage, the initial load at the time of impact rapidly rises to a predetermined load at which safety is ensured. When an even greater impact force is applied, a tensile force finally acts on the lateral rib 12j in multiple directions. As a result, as shown by a solid line in FIG. 5, the rectangular opening 12h of the lateral rib 12j tends to expand outward. At a certain point in time when the opening is widened, a part of the horizontal rib 12j is torn between the four corners 12m of the opening peripheral edge 12h 'of the opening 12h and the vertical rib 12i. The tear of the horizontal rib 12j increases the degree of freedom of the vertical rib 12i, making it easier to deform, and allows the vertical rib 12i to receive most of the subsequent impact load. Therefore, the load-deformation characteristic curve which rises rapidly until the time of the tearing shifts to a gentle characteristic curve due to only the substantially vertical rib 12i, and the impact load applied thereafter is largely absorbed, and the impact load is suppressed to a substantially constant impact load. You.
[0047]
For this reason, as compared with a conventional shock absorber that is formed only of vertical and horizontal grid-like ribs and has a continuous drag over the entire length, the buckling that immediately bottoms out is achieved although the drag is reduced. Never. Therefore, the split portion 12 of the lateral rib 12j k Is rapidly increased to a predetermined load until the rupture portion 12 breaks. k Corner 12 of m When is fractured, the load can be stably maintained and a predetermined deformation amount can be secured.
[0048]
Further, when the lattice portion 12e is formed integrally, the resin portion is processed so that the cut portion 12e is formed. k Can be treated as a small variation in the flow cross section, and by filling the resin from the vertical ribs 12i having a wide flow cross section to the relatively narrow horizontal ribs 12j, a change such as rapidly narrowing the flow cross section of the resin occurs. No shock absorber 12 can be formed. For this reason, it is possible to prevent the strength from being remarkably reduced at the joining portion of the resin, and to obtain predetermined impact absorption characteristics.
[0049]
The openings 12h of the horizontal ribs 12j may be provided for each grid unit of the grid portion 12e, or may be formed in a dispersed manner in order to obtain suitable characteristics of the shock absorber 12. Further, the tearing portion 12k may be provided for each grid unit of the grating portion 12e, and a configuration in which the tearing portion 12k is not formed in some of the grating portions 12e may be adopted.
[0050]
Further, by setting the tearing portion 12k to be thinner than other portions, the opening peripheral edge 12h 'of the lateral rib 12j can be formed. In this case, the strength of the opening peripheral edge 12h 'can be appropriately selected according to its thickness. The rise characteristic of the impact value when absorbing the initial load can be controlled by changing the opening area of the opening 12h.
[0051]
Further, based on the statistical collision frequency distribution in the garnish body 11, depending on whether the garnish body 11 is in a longitudinal direction, a width direction or a simple surface or a corner portion, the opening area of the opening 12h and the cracks are determined. The arrangement, the number, the width, the thickness, and the like of the cut portions 12k can be appropriately selected.
[0052]
FIG. 6 shows a shock absorber according to a second embodiment of the present invention. In FIG. 6, substantially the same members as those in the first embodiment are denoted by the same reference numerals and names. Therefore, a detailed description of these members will be omitted.
[0053]
In this embodiment, a third rib 12n constituting a part of the characteristic portion of the present invention is provided on j And the vertical rib 12i. According to FIG. 6, the impact absorber 12 has the lateral rib 12 j In addition, a rectangular opening 12h is formed, and the third rib 12n is linearly arranged from one end to the other end at an arbitrary plane position in the width direction of the vertical rib 12i. The third rib 12n is disposed substantially at a right angle to the vertical rib 12i and the horizontal rib 12j, and extends to the rectangular window frame-shaped opening 12h opened to the horizontal rib 12j.
[0054]
The third rib 12n constitutes a tear portion 12k that is torn by an impact at the time of a collision with the peripheral edge 12h 'of the lateral rib 12j. The split portion 12k is a corner 12m shared by the vertical rib 12i, the horizontal rib 12j, and the third rib 12n. The tearing position is at four corners 12m of the tearing part 12k, and the horizontal rib 12j near the opening 12h 'of the horizontal rib 12j near the corner 12m is broken by the impact at the time of collision. Is caused.
[0055]
As shown in FIG. 6, the third ribs 12n are arranged on the vertical ribs 12i-1 at approximately 1/3 of the position closer to the garnish main body side, and are arranged in a cross shape on both sides. In the vertical rib 12i-2, the third rib 12n is arranged only on one side in a T-shape or an L-shape. In the vertical rib 12i-3, the third rib 12n is disposed on both sides of the garnish body side and the vehicle body panel side. According to this configuration, these third ribs 12n increase the rigidity of the vertical ribs 12i and make it difficult for buckling deformation to occur at a predetermined intermediate portion in the height direction of the vertical ribs 12i. With the third rib 12n, the shock absorbing characteristics of the shock absorber 12 can be adjusted according to the positional relationship between one side and / or the other side of the vertical rib 12i.
[0056]
Now, when the garnish main body 11 is subjected to an impact that does not strongly collide with the garnish main body 11 from the direction of arrow F shown in FIG. 2 and the garnish main body 11 is deformed, the vertical ribs 12i and the horizontal ribs 12j are connected to the center. The vertical ribs 12i on the upper and lower sides of the third ribs 12n disposed on the side of both ribs 12i and 12j in the protruding state, or both, are bent to absorb the impact. I do.
[0057]
When the impact due to the collision is large, one of the upper and lower sides of the third rib 12n or both of the vertical ribs 12i bends to absorb the impact, and subsequently, the transverse rib 12j exerts a tensile force in multiple directions. Acting, the rectangular opening 12h of the horizontal rib 12j expands outward. At a certain point in time of the expansion, between the four corners 12m of the opening edge 12h 'of the opening 12h and the vertical rib 12i, and between the third rib 12n and the horizontal rib 12j. Between the formed corner 12m and the horizontal rib 12j, a part of the horizontal rib 12j is gradually split. Due to the stepwise tearing of the horizontal rib 12j, most of the subsequent impact load is received by the vertical rib 12i to absorb the impact.
[0058]
In the second embodiment, an example is shown in which various arrangements of the tearing portion 12k are arranged in one shock absorber 12, but the present invention is not limited to this. In addition to the same shape as the whole, the shape of the cut portion 12k is appropriately distributed in different height directions, the shape formed in all the openings 12h, the shape formed in some of the openings 12h, or a combination thereof. The load can be controlled by selecting various forms including the following.
[0059]
Further, according to each of the illustrated examples, a relatively large number of the rectangular openings 12h are distributed in the horizontal ribs 12j, and a relatively small number of closed portions without the openings 12h are distributed. Although illustrated, the opening 12h is increased according to the position, shape, and material of the body panel to be applied, the shape and material of the interior part, and the like, or is configured to include no closing portion at all. You can also.
[0060]
As is clear from the above description, according to the garnish structure according to the present invention, at least a part of the second ribs of the shock absorber is formed between the first rib and the opening that opens between the first ribs. A predetermined load is rapidly applied until the tearing portion of the second rib breaks, since the opening portion has a tear portion at the periphery of the opening portion which extends to the opening portion and breaks by an impact at the time of a collision. When the tearing portion subsequently breaks, the load can be stably maintained and a predetermined amount of deformation can be secured.
[0061]
Therefore, a predetermined amount of deformation can be ensured while maintaining the load that has risen to the predetermined load at the time of the impact, so that the impact can be effectively absorbed and the safety of the occupant can be sufficiently ensured. In particular, the initial load at the time of impact can be raised to a predetermined impact value by appropriately setting the opening area of the opening portion, the arrangement, the number, the thickness, and the like of the tearing portion. An effective shock absorbing stroke can be ensured in the state maintained.
[0062]
Further, it is possible to avoid a structure that causes a wide or narrow change such as abruptly narrowing the flow cross section of the resin, and it is possible to obtain a practical product in which the strength is not significantly reduced at the junction of the resins. It should be noted that the present invention is not limited to the above-described embodiments, but naturally includes a technical range that can be easily changed by those skilled in the art from those embodiments.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pillar garnish according to a first embodiment of the present invention as viewed from a vehicle body panel side.
FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, showing a state where the pillar garnish is attached to a vehicle body panel.
FIG. 3 is a perspective view of the shock absorber of the present invention as viewed from the passenger compartment side.
FIG. 4 is an enlarged sectional view taken along line BB of FIG. 3;
FIG. 5 is a partial perspective view showing a part of the shock absorber of the present invention deformed at the time of impact.
FIG. 6 is a partial sectional view showing another embodiment of the shock absorber of the present invention.
FIG. 7 is a graph showing a shock absorption characteristic of a conventional shock absorber.
[Explanation of symbols]
1 Center pillar
1a Inner panel
1b Outer panel
1a ', 1b' Flange
2 Seat belt adjuster
2a Rail
3 door opening trim
3a Seal part
3b Fitting part
4 space part
10 Pillar garnish
11 Garnish body
11a Side wall
11b Polymerization section
11c opening
11d engaging nail
11e, 11e 'Mounting boss
12 Shock absorber
12a concave notch
12b, 12c Mounting piece
12b ', 12c' Mounting hole
12d body
12e grid
12f guide concave part
12g insertion opening
12h opening
12h 'Opening edge
12i 1st rib
12j 2nd rib
12k breaking part
12m corner
12n third rib
13 slide plate
13a insertion hole

Claims (2)

A garnish structure that covers the vehicle body panel (1) on the passenger compartment side,
A garnish body (11) covering the body panel (1), and a shock absorber (12) arranged between the garnish body (11) and the body panel (1),
The shock absorber (12) has a plurality of first ribs (12i) arranged along opposing side edges of the main body (12d) and a plurality of first ribs (12i) connecting the first ribs (12i). And two ribs (12j),
The second rib (12j) has a rectangular opening (12h) opened between at least some of the plurality of first ribs (12i) adjacent to the first ribs (12i). Between the adjacent first rib (12i) and the opening (12h), at the opening peripheral portion (12h ') of the opening (12h), a tear portion (12k) which is torn by an impact at the time of collision A garnish structure comprising: The garnish structure according to claim 1, wherein the tearing portion (12k) is provided in a part of the second rib (12j) and near a corner (12m) of the opening (12h).

Images