JPH0811541A - Trim for automobile - Google Patents

Abstract

PURPOSE:To make improvements in the formability of a trim body equipped with an impact energy absorbing rib, and also in an impact energy absorbing effect. CONSTITUTION:A rib 4 formed in bridgelike with a pressure receiving part 5 and each leg support part 6 at both the sides is installed in the required part of a backside 1a of a trim body 1, and an auxiliary leg support part is integrally formed in a backside central part of the pressure receiving part 5 in the same forming direction as the leg support parts 6, while a thin-wall part made up of installing a slit oppositely at the both sides is formed in the auxiliary leg support part 7 in a multistage manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle trim which is mounted on a panel surface of a vehicle interior side such as a door inner panel or a rear side inner panel of a vehicle to decorate the panel surface.

[0002]

2. Description of the Related Art In an automobile trim, for example, as disclosed in Japanese Utility Model Laid-Open No. 2-64242, an energy absorbing portion having a honeycomb structure is provided on the back surface of a trim body as a countermeasure against a side collision of a vehicle. It is known to protect the occupant by absorbing the collision energy by buckling deformation of the honeycomb-shaped energy absorbing portion when the occupant inertially moves to the side of the passenger compartment during a side collision of the vehicle. ing.

[0003]

Since the energy absorbing portion has a honeycomb structure, when the resin material is molded, it is difficult to remove the mold regardless of whether the energy absorbing portion is integrally molded with the trim body or is molded separately. It cannot be denied that the moldability will deteriorate.

Further, since the energy absorbing portion has a honeycomb structure, the initial reaction force at the time of buckling deformation becomes large, and it becomes difficult to obtain an ideal low reaction force deformation mode.

Further, when the above-mentioned honeycomb structure is formed of a resin material, since the partition walls of the honeycomb need to be thickened to some extent in terms of molding, in order to reduce the initial reaction force during buckling deformation as much as possible, It is necessary to increase the protrusion height from the rear surface of the trim body, which not only narrows the vehicle interior space, but also causes a problem that the weight of the trim increases and goes against the weight reduction of the vehicle body.

Therefore, the present invention has good moldability, and
(EN) Provided is a vehicle trim including a collision energy absorbing rib that has a low initial reaction force during buckling deformation and can obtain an ideal deformation mode.

[0007]

According to a first aspect of the present invention, a pressure receiving portion and supporting legs on both sides of the pressure receiving portion are provided on a rear surface of a trim main body which is mounted on a panel surface of a vehicle interior side portion and decorates the panel surface. A bridge-shaped rib for absorbing collision energy is provided, and an auxiliary supporting leg portion is integrally formed on the back surface of the pressure receiving portion between the supporting leg portions on both sides in the same forming direction as these supporting leg portions.

In the second aspect of the present invention, the auxiliary support leg portion is formed with a multi-tiered thin portion formed by providing slits from opposite side surfaces of the auxiliary support leg portion.

In the third aspect, the slit is formed to have a width narrower than the thickness width of the general portion of the auxiliary supporting leg portion.

According to another aspect of the present invention, the plurality of thin portions have different thickness widths.

[0011]

According to the first aspect of the present invention, when a side collision of a vehicle or the like causes an occupant to inertially move to a side of a passenger compartment, interfere with the trim body, and a collision load acts axially on a rib on the rear surface of the trim body, the rib moves. Buckles and deforms between the trim body and the vehicle body panel to absorb collision energy.

At this time, since the rib for absorbing the collision energy is formed in a bridge shape between the pressure receiving portion and the supporting legs on both sides thereof, the bending deformation of the pressure receiving portion and the supporting leg portions on both sides and the auxiliary supporting leg portion between the supporting leg portions are formed. The buckling deformation of is smoothly performed, and the initial reaction force at the time of deformation can be suppressed to be small.

Further, since the bridge-shaped rib is provided with the auxiliary supporting legs, the amount of collision energy absorption can be arbitrarily adjusted by the number of auxiliary supporting legs, and the optimum collision energy absorption characteristic can be obtained.

On the other hand, apart from such an advantage in absorbing the collision energy, the rib is a bridge and the auxiliary supporting leg is integrally formed in the same forming direction as the supporting leg, so that it is made of a resin material. When molding is performed, the molding die can be easily demolded regardless of whether it is integrally molded with the trim body or molded separately, and the moldability can be improved.

Further, since the ribs can be smoothly buckled and deformed and a sufficient deformation effective stroke can be secured, the height of protrusion from the rear surface of the trim main body can be suppressed to a relatively small value, and the vehicle interior space is not narrowed. .

According to the second aspect of the present invention, since the auxiliary support leg portion is provided with a plurality of thin-walled portions formed by forming slits from both side surfaces thereof so as to face each other, the auxiliary support leg portion is deformed from each thin-walled portion during buckling deformation. Since the buckling deformation in the axial direction is induced and the buckling deformation is smoothly performed, the buckling deformation in the entire axial direction of the rib can be promoted.

Further, the collision energy absorption characteristics can be arbitrarily adjusted by the number of steps of the thin portion.

According to the third aspect, the slits on both side surfaces of the auxiliary supporting leg portion are formed to have a width narrower than the thickness width of the general portion of the auxiliary supporting leg portion. Therefore, when the buckling starts from the thin portion, the slit is formed. Since the upper and lower edges of the auxiliary support legs interfere with each other, bending deformation of the auxiliary supporting leg portions is suppressed, and the auxiliary supporting leg portions can be reliably buckled and deformed in the axial direction.

According to the fourth aspect, the collision energy absorption characteristics can be arbitrarily adjusted by varying the thickness widths of the plurality of thin portions provided on the auxiliary supporting leg in multiple stages.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings by taking a door trim as an example.

1 to 3, reference numeral 1 denotes a resin trim main body mounted on the door inner panel Da surface of the door main body D by a clip or the like (not shown). It is bulged toward the outside, and a pocket 3 is provided on the lower side.

A required portion of the back surface 1a of the trim body 1, that is, a portion which is most likely to receive a load when an occupant seated on a seat (not shown) laterally inertially moves due to a side collision of the vehicle, for example, Ribs 4 and 4 are integrally formed with the trim body 1 at a portion corresponding to a side of a waist portion which is a seating center of gravity of a seated occupant and a portion corresponding to a side of a shoulder portion of a seated occupant. .

The rib 4 is a pressure receiving portion 5 parallel to the trim body 1.
And the supporting legs 6 and 6 on both sides thereof are formed in a bridge shape.

The supporting legs 6 and 6 are formed to be inclined outward so that the ribs 4 can be easily buckled and deformed in the axial direction so that the ribs 4 have a trapezoidal bridge shape.

On the back surface of the pressure receiving portion 5 between the supporting leg portions 6, 6, for example, the central portion of the back surface of the pressure receiving portion 5, one auxiliary supporting leg portion 7 is provided across the back surface 1a of the trim body 1 as the supporting leg portions 6, 6. It is integrally molded in the same forming direction as.

The auxiliary support leg portion 7 is formed with a plurality of thin portions 8 formed in multiple stages so as to face each other on both sides thereof and have slits 9 formed therein.

The slit 9 is formed sufficiently narrower than the thickness width of the general portion of the auxiliary supporting leg portion 7.

According to the structure of the above embodiment, the occupant inertially moves to the side of the passenger compartment during a side collision of the vehicle, the waist and shoulder of the occupant interfere with the trim body 1, and the ribs 4 are axially moved. When a load acts on the trim body 1 and the door inner panel D
The rib 4 undergoes buckling deformation with respect to a, and the buckling deformation of the rib 4 absorbs the collision energy.

Since the rib 4 is formed in a trapezoidal bridge shape with the pressure receiving portion 5 and the supporting legs 6, 6 on both sides thereof, the bending deformation of the pressure receiving portion 5 and the supporting legs 6, 6 on both sides, and The buckling deformation of the auxiliary supporting leg portion 7 disposed in the middle portion between them is smoothly performed, and as shown by the line a, compared with the energy absorption characteristics (line b) of the conventional honeycomb structure as shown in FIG. The initial reaction force at the time of deformation can be suppressed to be small, the characteristics can be stabilized, and the collision energy can be efficiently absorbed.

In particular, in this embodiment, since the auxiliary supporting leg portion 7 is formed with a plurality of thin portions 8 which are formed by forming slits 9 on both sides of the auxiliary supporting leg portion 7 so as to face each other, the rib 4 is formed.
At the time of buckling deformation of the ribs 4, the auxiliary supporting leg portions 7 are smoothly buckled by inducing axial buckling deformation from each thin portion 8 and
The overall axial buckling deformation of the can be promoted, and an efficient collision energy absorbing action can be performed.

Moreover, since the groove width L of the slit 9 is formed sufficiently narrower than the thickness width T of the general portion of the auxiliary supporting leg portion 7, when the buckling starts from the thin portion 8, the auxiliary supporting leg portion is formed. 7
Even if bending deformation is attempted, the upper and lower edges of the slit 9 immediately interfere with each other to suppress this bending deformation, and the auxiliary supporting leg portion 7 can be reliably buckled and deformed in the axial direction.

Further, by adjusting the set number of the auxiliary supporting legs 7 as shown by the chain line in FIG. 3 or by adjusting the number of molding steps of the thin portion 8 of the auxiliary supporting legs 7, the collision energy absorption characteristics can be improved. It can be adjusted arbitrarily, and the required optimum collision energy absorption characteristic can be easily obtained.

On the other hand, apart from such an effect on the impact energy absorption characteristics, the rib 4 is formed into a bridge shape which is easy to form, and the auxiliary supporting leg portion 7 has the supporting leg portions 6 and 6.
Since it is formed in the same forming direction as that of No. 6 and is aligned with the die-cutting direction of the forming die (not shown), the die-forming of the forming die can be easily performed and the formability can be improved.

Further, as described above, the rib 4 can be smoothly buckled and deformed, and a sufficient deformation effective stroke can be secured, so that the protruding height from the rear surface 1a of the trim body 1 can be suppressed to be relatively small. Therefore, it does not reduce the vehicle interior space.

FIG. 5 shows a different example of the auxiliary supporting leg portion 7. In this embodiment, a plurality of thin portions 8 formed in multiple steps on the auxiliary supporting leg portion 7 have different thickness widths. The thickness width of the thin portion 8 is gradually reduced from both ends in the protruding height direction of the supporting leg portion 7 to the central portion, and the auxiliary supporting leg portion 7 is formed.
Buckling deformation of the auxiliary support leg 7
The axial buckling deformation of is made smoother.

By forming the plurality of thin portions 8 of the auxiliary supporting leg portion 7 with different thickness widths as in this embodiment,
In addition to the effect of accelerating the buckling deformation of the auxiliary supporting leg portion 7 in the axial direction, the collision energy absorption characteristics can be arbitrarily adjusted.

Although the rib 4 is integrally formed on the back surface 1a of the trim body 1 in the above embodiment, the rib 4 is formed separately from the trim body 1 and fixed to a required portion of the back surface 1a of the trim body 1. You may do it.

In this case, for example, the trim body shown by reference numeral 1 in FIG. 3 may be replaced with a resin base plate 10, and the rib 4 may be integrally formed with the base plate 10.

[0039]

As described above, according to the present invention, the following effects can be obtained.

(1) The rib provided on the rear surface of the trim body is formed in a bridge shape between the pressure receiving portion and the supporting legs on both sides thereof, and the auxiliary supporting leg portion is integrally formed on the rear surface of the pressure receiving portion in the same forming direction as these supporting leg portions. Since it is molded, when the rib receives a collision load in the axial direction, such as during a side collision of the vehicle, the bending deformation of the pressure receiving part and the buckling deformation of the supporting leg part and the auxiliary supporting leg part are smoothly performed, and the ribs are deformed. The initial reaction force at the time can be suppressed to a small level to absorb the collision energy, and the occupant can be protected safely.

(2) Since the bridge-shaped rib is provided with the auxiliary supporting legs, the amount of collision energy absorption can be arbitrarily adjusted by the number of the auxiliary supporting legs, and the required optimum collision energy absorption characteristic can be easily achieved. Obtainable.

(3) Since the ribs are formed in a bridge shape which is easy to form and the auxiliary support legs are formed in the same forming direction as the support legs, the ribs of the forming die are not the same when forming with a resin material. Die cutting becomes easy, the moldability can be improved regardless of whether it is integrally molded with the trim body or separately molded, and the cost can be reduced.

(4) Since the rib is smoothly buckled and deformed and a sufficient effective stroke can be secured, the height of protrusion from the rear surface of the trim body can be suppressed to be relatively small.
Does not reduce the vehicle interior space.

(5) Since the auxiliary supporting legs are provided with multi-tiered thin-walled portions formed by providing slits on both sides of the auxiliary supporting legs so as to face each other, the auxiliary supporting legs are seated axially from each thin-walled portion during buckling deformation. Since the buckling deformation is induced and the buckling deformation is smoothly performed, it is possible to promote the buckling deformation of the rib in the axial direction as a whole and obtain a stable collision energy absorption characteristic.

(6) Since the auxiliary supporting leg has a plurality of thin portions, the collision energy absorption characteristics can be arbitrarily adjusted by the number of steps of the thin portions, and the degree of freedom in design can be expanded.

(7) Since the slits on both side surfaces of the auxiliary supporting leg are formed to have a width narrower than the thickness width of the general portion of the auxiliary supporting leg, when the auxiliary supporting leg starts buckling from each thin portion. The upper and lower edges of the slit interfere with each other to prevent bending deformation of the auxiliary supporting leg portion, and the auxiliary supporting leg portion can be reliably buckled and deformed in the axial direction.

(8) Since the collision energy absorption characteristics can be arbitrarily adjusted by varying the thickness widths of the plurality of thin portions of the auxiliary support leg, the degree of freedom in design can be expanded.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the trim body according to the embodiment as viewed from the back side.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a collision energy absorption characteristic diagram of a rib.

FIG. 5 is a sectional view similar to FIG. 3, showing a rib portion of a second embodiment of the present invention.

[Explanation of symbols]

 1 Trim body 4 Rib 5 Pressure receiving part 6 Support leg part 7 Auxiliary support leg part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuhiko Takahashi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (4)

[Claims] 1. A rib for absorbing collision energy, which is mounted on a panel surface of a vehicle compartment side and is formed in a bridge shape on a back surface of a trim main body for decorating the panel surface, the pressure receiving portion and supporting legs on both sides thereof. And an auxiliary supporting leg portion is integrally formed on the back surface of the pressure receiving portion between the supporting leg portions on both sides in the same forming direction as these supporting leg portions. 2. The trim for an automobile according to claim 1, wherein the auxiliary support leg portion is provided with a plurality of thin-walled portions formed by providing slits from opposite side surfaces thereof so as to face each other. 3. The automobile trim according to claim 2, wherein the slit is formed to have a width narrower than a thickness width of a general portion of the auxiliary supporting leg portion. 4. The automobile trim according to claim 2, wherein the plurality of thin-walled portions are formed with different thickness widths.