JP2003252155A - Interior component for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a shock absorbing function of an interior component for an automobile mounted in a side wall panel of a car body and having a shock absorbing pad on the rear surface of an impact area. <P>SOLUTION: A plate-like rib 30 extending from a mounting surface is disposed on the rear surface of the trim substrate 11 in a waist part impact area A, and is mounted in the shock absorbing pad 20 fixed onto the rear surface of the trim substrate 11 on the rear surface of the waist part impact area A in an inserted state of the plate-like rib 30. When an impact load is charged due to side impact or the like, the plate-like rib 30 receives the impact, thereby increasing standing speed in the initial time of the impact, inducing buckling with a recessed groove 31 and an opening 32 disposed in the plate-like rib 30, suppressing excessive increase of a peak reaction force, and securing an ideal shock absorbing function. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior part provided with a shock absorbing pad in an impact area where a passenger's waist or the like collides during a side collision, and particularly, to obtain an ideal shock absorbing performance in a side collision. Related to interior parts for automobiles.

[0002]

2. Description of the Related Art Usually, an interior component mounted on the interior side of a side wall panel of a vehicle has a shock absorbing function capable of absorbing a shock load applied to an occupant when a shock is applied from the side.

For example, in the automobile door trim 1 shown in FIG. 11 (a), a synthetic resin such as PP (polypropylene) resin is molded and press-molded and injection-molded to mold the door trim base material 1a into a desired shape, and an armrest. The function of the door trim 1 is satisfied by integrally providing the 1b, the door pocket 1c, and the speaker grill 1d.

Then, the door trim base material 1 of the door trim 1
On the back surface of a, for example, in a portion corresponding to the occupant's waist,
As shown in FIG. 11B, the impact absorbing pad 2 is bonded and fixed by a hot melt adhesive or the like as a waist impact area. As the shock absorbing pad 2,
Molded urethane has been used conventionally.

Although not shown, the impact absorbing pads 2 shown in FIG. 11 (b) may be provided in parallel in the shoulder impact area where the shoulder of the occupant can easily touch.

In the case where the impact absorbing pad 2 is attached to the waist impact area of the door trim 1, when a load is actually applied to the side of the vehicle due to a side collision or the like, the impact absorbing pad 2 is impacted by compressive deformation and breakage. Is absorbed. FIG. 12 shows a load / stroke curve of the shock absorbing pad 2 made of a urethane mold.

[0007]

As described above, when the shock absorbing pad 2 made of molded urethane or the like is installed on the back surface of the impact area of the door trim 1, the shock absorbing pad 2 has good shock absorbing performance due to compression deformation and breakage. However, the reaction force at the initial stage of impact tends to be small as shown in the graph of FIG. 12, and the energy absorption cost cannot be secured so much. To further improve the impact absorption function, these points should be taken into consideration. There was an urgent need to resolve it.

The present invention has been made in view of the above circumstances, and in an automobile interior part equipped with a shock absorbing pad, an impact load from the outside such as a side impact is applied in response to an impact area. At this time, the initial rise of reaction force characteristics is fast, and the peak reaction force does not rise too much,
It is an object of the present invention to provide an automobile interior part that can obtain an ideal shock absorbing performance such that an appropriate value can be maintained.

[0009]

In order to achieve the above object, the invention according to claim 1 of the present application comprises a trim base material formed into a required shape, and impacts the back surface of the trim base material in the impact area. In an automobile interior part having an absorption pad fixed thereto, a plate-shaped rib for supporting and fixing the shock absorption pad is provided on the back surface of the trim base material, and a rigidity lowering portion for buckling is formed on the plate-shaped rib. Therefore, when an external impact load is applied to the vehicle, it is possible to absorb the impact load by buckling deformation of the rigidity lowering portion.

Here, the rigidity-reduced portion may be appropriately selected from a single groove, a plurality of concave grooves, a single hole, a plurality of openings, or a combination of grooves and openings.

According to the automobile interior part of the present invention, a plate-shaped rib extending from the shock absorbing pad mounting surface is provided on the back surface of the trim base material in the impact area, and the plate-shaped rib is impacted. Since the absorption pad is fixed, when an external impact such as a side collision is applied to the vehicle, it is received by the impact absorption pad and the plate-shaped ribs, and the shock load can accelerate the initial rise. .

Further, since the plate-shaped rib is provided with a reduced-rigidity portion for buckling, when the external impact load reaches a predetermined value, the reduced-rigidity portion is buckled and the plate-shaped rib is broken. Therefore, the reaction force at the peak does not become so large, and the reaction force at the peak can be maintained at an appropriate value.

The invention according to claim 2 of this application is characterized in that the plate-like ribs are integrally formed on the back surface of the trim base material.

Here, in order to form the plate-shaped rib integrally with the trim base material, injection molding, mold press molding or the like can be used for the trim base material.

According to the automobile interior part of the second aspect, the plate-shaped ribs can be easily integrated simply by making a hole in the molding die for molding the trim base material.

The invention according to claim 3 of this application is characterized in that the plate-shaped rib is formed separately from the trim base material, and is fixed to the trim base material via a mounting flange. .

Here, the trim base material and the plate-shaped ribs are formed separately from each other by forming a fiber board, a composite fiber board or the like, which is difficult to form the rib integrally with the trim base material, by hot press molding or the like. The plate-shaped rib is a plate-shaped rib having a substantially T-shaped cross section in which a flange-shaped mounting bracket is integrally molded with the edge of the plate-shaped rib for mounting on the trim base material. used.

According to the automobile interior component of the third aspect, the trim base material can be made of an inexpensive material and the trim base molding die can be easily processed.

The invention according to claim 4 of this application is characterized in that the plate-shaped rib is formed substantially perpendicular to the back surface of the trim base material.

According to a fifth aspect of the present application, a pressing plate extending in the left-right direction is provided at the tip of the plate-shaped rib, and the shock absorbing pad is sandwiched between the pressing plate and the trim base material. Is characterized by.

According to the automobile interior part of the fifth aspect, since the pressing plate extending in the left-right direction is integrally provided at the tip of the plate-like rib, for example,
When the impact load is applied from the side, even if the impact load deviates from the plate-shaped rib, the load is applied to the plate-shaped rib via the pressing plate, and the allowable range of load absorption can be expanded.

Further, since the shock absorbing pad is sandwiched between the pressing plate and the trim base material,
Since the holding force of the pressing plate is added to the adhesive force of the shock absorbing pad, the bonding strength of the shock absorbing pad can be further strengthened.

The invention according to claim 6 of this application is characterized in that the pressing plate is set in an umbrella shape or a curved shape so that both side edges are located lower than the central portion.

According to the automobile interior part of the sixth aspect, since the pressing plate provided at the tip of the plate-shaped rib is formed in an umbrella shape or a curved shape, an impact load from an oblique direction is applied. Even when applied, the load can be properly transmitted to the plate-shaped rib.

Moreover, since the pressing plate is set in an umbrella shape or a curved shape, both side edges of the pressing plate are in line contact with the shock absorbing pad and are held in a state of being provided with elastic repulsive force. Thereby, the bonding strength can be enhanced.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which an automobile interior part according to the present invention is applied to an automobile door trim will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front view showing an automobile door trim to which the present invention is applied, FIG. 2 is an explanatory view showing a shock absorbing pad mounting structure showing a first embodiment of the present invention, and FIG. 3 is the shock absorbing pad. FIG. 4 is a perspective view showing a mounted state, and FIG. 4 is a sectional view showing a state in which the shock absorbing pad is mounted. Further, FIG. 5 is a perspective view showing a modification of the plate-shaped ribs according to the first embodiment of the present invention.

FIGS. 6 and 7 show the second embodiment of the present invention. FIG. 6 is an explanatory view showing the mounting state of the shock absorbing pad, and FIG. 7 is a sectional view showing the mounting structure of the shock absorbing pad. . 8 and 9 show the third embodiment and the fourth embodiment of the present invention.
Each explanatory view of the mounting structure of the shock absorbing pad showing the embodiment,
FIG. 10 is a graph showing a comparison between load / stroke curves of the first embodiment of the present invention and the conventional example.

1 to 5, a first embodiment in which the present invention is applied to an automobile door trim will be described.

The automobile door trim 10 is composed of a door trim base material 11 formed into a required shape. The door trim base material 11 is injection molded or molded by pressing PP (polypropylene) resin or PP resin mixed with talc. It is molded into the required shape by molding.
In addition, an armrest 12 that bulges toward the inside of the room is formed in the center, a door pocket 13 that can accommodate equipment is provided below the armrest 12, and a speaker grill 14 is integrally formed on the front side.

A portion indicated by a dotted line in FIG. 1 is a shock absorbing pad 20 attached to the back surface of the door trim base material 11, and a place where this shock absorbing pad 20 is installed corresponds to a waist impact area A where the waist of an occupant hits. .

The vehicle door trim 10 has a shock absorbing pad 20 fixed to the back surface of the door trim base material 11 in the waist impact area A. As the shock absorbing pad 20, a molded urethane, an olefin resin foam, an olefin resin foam bead body, or the like is applied. However, considering cost and shock absorption, a urethane resin molded body, that is, a mold. Urethane is preferred.

The shock absorbing pad 20 used in this embodiment has a urethane foam density of 0.02 to 0.23 g.
/ 5cm, reaction force at 50% compression is ³ to 5kg
The mold urethane of f is used.

By the way, the automobile door trim 10 according to the present invention has an ideal shock absorbing performance, that is, the initial rising speed is fast and the reaction force peak value can be controlled so as not to become excessively large. The exploded perspective view and the mounting state diagram shown in FIG.

As shown in FIG. 2, the door trim 1 is provided on the back surface of the door trim base material 11 in the waist impact area A.
A clip seat 15 for attaching 0 to a vehicle body panel (not shown) via a clip and a locate pin 16 for positioning the shock absorbing pad 20 at appropriate positions are formed in a protruding manner as shown in the drawing. 16 and the plate-shaped rib 30 extending from the back surface of the door trim base material 11 in the direction perpendicular to the surface of the door trim base material 11.
It is integrally molded with 1.

Further, the plate-shaped rib 30 is provided with two recessed grooves 31 extending in the lateral direction. The length x width x thickness of the plate-shaped rib 30 is 80 mm x 80 mm
The groove depth of the concave groove 31 is set to 2 mm.

As shown by the hatched lines in FIG. 2, the shock absorbing pads 20 are attached at substantially symmetrical positions on the clip seat 15 side and the locate pin 16 side with the plate-shaped rib 30 as a boundary. After applying the hot melt adhesive of No. 2 to the back surface of the door trim base material 11 and both side surfaces of the plate-shaped rib 30, the impact absorbing pad 2
Attach 0.

The impact absorbing pad 20 is composed of left and right divided bodies (20A, 20B), and the impact absorbing pad 20A on one side is formed with an insertion piece 21 so that it can be locked and fixed to the clip seat 15. It is adhered and fixed to the back surface of the door trim base material 11 and one side surface of the plate-shaped rib 30 (side surface on which the groove 31 is formed).

The shock absorbing pad 20 which is the other divided body
B is a locate hole 2 for inserting the locate pin 16
2 is opened, and is adhered and fixed to the back surface of the door trim base material 11 including the locate pin 16 and the other side surface of the plate-shaped rib 30 via an adhesive. 3 and 4 show a state in which the shock absorbing pad 20 is bonded and fixed to the back surface side of the waist impact area A of the door trim base material 11.

As described above, in the vehicle door trim 10 according to the first embodiment of the present invention, since the structure in which the shock absorbing pad 20 is supported and fixed by the plate-shaped rib 30 is adopted, it is clear from the sectional view shown in FIG. When a shock load from the side is applied to the vehicle such as a side collision,
When an impact load (indicated by F in the figure) from the door panel is applied, the initial load tends to rise slowly due to the compressive deformation of the impact absorbing pad 20 itself in the related art. Because it is received by, it rises quickly in the initial stage of impact. This is
It is clear from the point (a) in the graph of 0.

Furthermore, since the plate-shaped rib 30 is formed with two rows of concave grooves 31, the plate-shaped rib 30 is ruptured on the basis of the concave groove 31 due to an impact load of a predetermined value, so that the load peak value is increased. Can be lowered. This is clear from point (b) in the graph of FIG.

Therefore, in the automobile door trim 10 according to the first embodiment, the plate-shaped rib 30 is provided on the back surface of the waist impact area A of the door trim base material 11 as a support structure of the shock absorbing pad 20 made of molded urethane. Since the plate-shaped rib 30 is integrally molded and receives the impact load F, the rise at the initial stage of impact is fast, and the recessed groove 31 formed in the plate-shaped rib 30 induces buckling, so that the impact reaction force is increased. The peak value of is not excessive and can be adjusted to an appropriate peak value, and an ideal shock absorbing performance can be obtained.

In the first embodiment, two rows of concave grooves 31 are formed as the buckling structure of the plate-shaped rib 30, but various structures may be used instead of the concave grooves 31 to partially reduce the rigidity. Things can be considered. For example, FIG.
The modified example shown in (d) can also be adopted.

As shown in FIG. 5A, even if a plurality of openings 32 are arranged in parallel in the plate-shaped rib 30, buckling can be induced based on the openings 32. As shown in FIG. 5B, even if the plate-shaped rib 30 is configured by the lattice-shaped ribs 33 extending in the vertical and horizontal directions, the same effect as that of the opening 32 described above can be obtained.
The reaction force peak value of the impact load can be appropriately lowered. As shown in FIG. 5C, it is possible to combine the concave groove 31 and the opening 32, and as shown in FIG. 5D, the concave groove 31 may be provided on both sides of the plate-shaped rib 30. good.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. In this second embodiment as well, a structure for supporting the shock absorbing pad 20 attached to the waist impact area A of the automobile door trim 10 is shown. Applied.

The door trim base material 11 in the automobile door trim 10 shown in FIG. 6 is made of wood fiber board, composite resin board, or the like.
Although it is inferior in formability to the door trim base material 11 used in the first embodiment, it is made of an inexpensive material. The clip seat 15a, the locate pin 16a, and the plate-shaped rib 30 are used.
Is a member that is molded separately from the door trim base material 11, and is bonded and fixed by adhesive fixing or ultrasonic welding fixing.

That is, in the second embodiment,
The clip seat 15a and the locate pin 16a attached to the back surface of the trim base material 11 made of a wood fiber board and the like are provided with mounting brackets 15b and 16b, respectively, and these mounting brackets 15b and 16b are provided at predetermined positions on the back surface of the door trim base material 11. It is attached.

Similarly, for the plate-shaped rib 30,
A mounting flange 34 is formed on the mounting surface side of the door trim base material 11 and has a substantially T-shaped cross-sectional shape. In addition, this T
Regarding the plate-shaped rib 30 having a character shape, the rigidity is partially reduced to induce buckling, so that two rows of the concave grooves 3 are provided.
1 is formed.

Also in this second embodiment, as shown in FIG. 7, when an external impact load F such as a side impact is applied, the plate-shaped rib 30 receives an impact, so that the rising at the initial stage of the impact occurs. The reaction force of the peak value can be suppressed very quickly and the recessed groove 31 provided in the plate-shaped rib 30 can provide an ideal shock absorbing function.

Next, FIG. 8 shows a third embodiment of the present invention. In FIG. 8, only the plate-shaped rib 30 and the shock absorbing pad 20 are shown for convenience, but the clip seat 1
5, the locate pin 16 and the like have the same configurations as those in the above-described embodiment, and therefore the illustration thereof is omitted.

Further, in the third embodiment, the plate-shaped rib 3 formed integrally with the trim base material 11 is used.
A pressing plate 35 extending horizontally in the left-right direction is integrally formed at the tip of 0.

Then, as shown in the figure, the pressing plate 35 is subjected to an impact load (F1 and F2 in the figure) to a position deviated from the center of the plate-shaped rib 30 through the pressing plate 35. Even when the impact loads F1 and F2 are transmitted to the plate-like rib 30 and the impact point is displaced, the plate-like rib 30 is supported to accelerate the rise at the initial stage of the impact.

Further, the pressing plate 35 is provided between the rear surface of the door trim base material 11 and the shock absorbing pads 20A, 20.
Since B can be pinched and fixed, in addition to the adhesive strength of the shock absorbing pad 20, there is an additional advantage that the shock absorbing pad 20 can be supported more firmly. Although illustration is omitted, it goes without saying that the reaction force peak value can be lowered by providing the plate-shaped rib 30 with the concave groove 31 and the opening 32. Further, in order to make the plate-shaped rib 30 a separate structure from the door trim base material 11, it may be fixed via the mounting flange 34.

Next, FIG. 9 shows a modification of the third embodiment. Instead of the horizontal pressing plate 35, FIG.
A curved pressing plate 35a shown in (a) and an umbrella-shaped pressing plate 35b as shown in FIG. 9 (b) are used.

The curved pressing plate 35a and the umbrella-shaped pressing plate 35b are the horizontal pressing plate 35.
A function equivalent to that, that is, even if the impact point is displaced, the impact force can be transmitted to the plate-shaped rib 30, and, for example, as shown by F3 and F4 in FIGS. 9A and 9B, Even if an impact load from an oblique direction is applied, the impact force can be transmitted to the plate-shaped rib 30, and the plate rib 30 can effectively function against the impact loads F3 and F4 from the oblique direction.

In particular, the shock absorbing pad 20 which is a divided body
Even if the thicknesses of A and 20B are different, the elastic deformation of the curved pressing plate 35a and the umbrella pressing plate 35b can be used to satisfactorily press and fix the shock absorbing pads 20A and 20B. Thereby, the support strength of the shock absorbing pad 20 can be made stronger.

Further, the curved pressing plate 35 shown in FIG.
Even in the case of the type using a or the umbrella-shaped pressing plate 35b, a separate type in which the mounting flange 34 is formed, and the point that the groove 31 and the opening 32 can be formed in the plate-shaped rib 30 are shown in FIG. Is the same as.

In FIG. 9, the pressing forces applied from the curved flange 36 and the umbrella-shaped flange 37 to the shock absorbing pads 20A and 20B are indicated by f1 and f2.

FIG. 10 shows a load / stroke (penetration amount) curve in the case of only the support structure of the shock absorbing pad 20 and the conventional shock absorbing pad 2 in the first embodiment of the present invention. One embodiment is shown by a solid line and a conventional example is shown by a dotted line.

Then, in the graph of FIG. 10, as shown by point (a), the rise at the initial stage of impact is fast, and as shown by point (b), the buckling is caused by the concave groove 31 provided in the plate-shaped rib 30. The pressure of the peak value due to can be suppressed.

In this embodiment, the shock absorbing pad 20 is used.
Was fixed by adhesion, but it may be fixed by welding and is not particularly limited.

[0062]

As described above, in the automobile interior part according to the present invention, the impact absorbing pad attached to the back surface of the trim base material in the impact area is supported by the plate-shaped rib extending from the back surface of the trim base material, When a shock is applied from the plate-shaped rib, the plate-shaped rib receives this shock load, so the initial rise is fast, and the peak value of the reaction force due to buckling deformation of the rigidity-reduced part such as the groove and opening provided in the plate-shaped rib It has an effect of suppressing an excessive rise and obtaining an ideal shock absorbing function.

Further, since the shock absorbing pad is fixed not only to the back surface of the trim base material but also to both sides of the plate-shaped rib, the mounting strength of the shock absorbing pad can be strengthened, and the shock absorbing pad can be detached due to aging. There is an effect that the quality performance can be improved without performing.

Further, if a pressing plate extending in the left-right direction is provided at the tip of the plate-shaped rib, the shock absorbing pad can be pressed and fixed by the pressing plate, so that the mounting strength of the shock absorbing pad can be strengthened. In particular, if the pressing plate is set in an umbrella shape or a curved shape, the elastic pressing force has the effect of further increasing the support strength and being able to cope with the variation in the thickness dimension of the shock absorbing pad.

[Brief description of drawings]

FIG. 1 is a front view of a vehicle door trim showing a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a mounting state of a shock absorbing pad in the vehicle door trim shown in FIG.

FIG. 3 is a perspective view of an impact area of the automobile door trim shown in FIG. 1, viewed from the back side.

FIG. 4 is a cross-sectional view showing a mounting structure of a shock absorbing pad in the vehicle door trim shown in FIG.

5 is a perspective view showing a modification of a plate-like rib used in the structure for mounting the shock absorbing pad in the automobile door trim shown in FIG.

FIG. 6 is a perspective view of an impact area in a vehicle door trim to which a second embodiment of the present invention is applied, as viewed from the back surface side.

7 is a cross-sectional view showing a mounting structure of a shock absorbing pad in the vehicle door trim shown in FIG.

FIG. 8 is a sectional view showing a mounting structure for a shock absorbing pad according to a third embodiment of the present invention.

9 is each sectional view showing a modified example of the mounting structure of the shock absorbing pad shown in FIG.

FIG. 10 is a graph showing a load / stroke correlation between the present invention and a conventional example.

FIG. 11 (a) is a front view of a conventional automobile door trim,
(B) It is a perspective view of the impact absorption pad attached to the conventional vehicle door trim.

FIG. 12 is a graph showing a load / stroke curve of a conventional impact absorbing pad.

[Explanation of symbols]

10 Automotive door trim 11 Door trim base material 15,15a clip seat 16,16a Locating pin 20,20A, 20B Shock absorption pad 21 Insert 22 Locate hole 30 plate-shaped ribs 31 groove 32 openings 33 Lattice rib 34 Mounting flange 35 Pressing plate 35a Curved pressing plate 35b Umbrella pressure plate A waist area

Claims (6)

[Claims] 1. A trim base material (1) formed into a required shape.
In the interior part for an automobile, which is composed of 1) and has a shock absorbing pad (20) fixed to the back surface of the trim base material (11) in the impact area (A), the shock absorbing pad (2) is attached to the back surface of the trim base material (11).
0) is provided to support and fix the plate-like rib (30), and the plate-like rib (30) is formed with the reduced rigidity portion (31, 32) for buckling,
An interior part for an automobile, characterized in that, when an external impact load is applied to the vehicle, the impact load is absorbed by the buckling deformation of the rigidity lowering portions (31, 32). 2. The automobile interior part according to claim 1, wherein the plate-shaped rib (30) is integrally formed on the back surface of the trim base material (11). 3. The plate-shaped rib (30) is formed separately from the trim base material (11), and has a mounting flange (3).
The interior component for an automobile according to claim 1, which is fixed to the trim base material (11) via 4). 4. The automobile according to any one of claims 1 to 3, wherein the plate-shaped rib (30) is formed substantially perpendicular to the back surface of the trim base material (11). Interior parts. 5. A pressing plate (35) extending in the left-right direction is provided at the tip of the plate-like rib (30), and the shock absorbing pad (20) is formed by the pressing plate (35) and the trim base material (11). ) Is pinched | interposed, The interior part for motor vehicles of Claim 4 characterized by the above-mentioned. 6. The automobile according to claim 5, wherein the pressing plate (35) is formed in an umbrella shape or a curved shape so that both side edges are located lower than the central portion. Interior parts.