JPH07246952A - Absorbing structure of impact exerted from structural member of automobile - Google Patents

Abstract

PURPOSE:To contribute to absorbing impact from the first of displacement of an interior trim material and improve characteristics of a load to a stroke quantity. CONSTITUTION:A structure absorbs impact exerted from a structural member 14 of an automobile having the structural member 14 formed by joining respective flanges of an inner panel 10 and an outer panel 12 together and an interior trim material 16 arranged inside of the inner panel 10. A part except flanges 11A and 11B of the inner panel 10 is substantially uniformly arranged, and has plural deformable projecting parts 24 projecting toward the interior trim material 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for absorbing a shock applied from a structural member of an automobile. The structural member is
In addition to the front pillars, center pillars, or rear pillars of the vehicle body, they are roof side rails that extend in the front-rear direction so as to connect the upper parts of these pillars, and header panels that extend in the left-right direction. Absorbs the impact on the.

[0002]

2. Description of the Related Art In a vehicle in which a pillar is formed by an inner panel and an outer panel so that a cross section cut by a horizontal imaginary plane has a closed structure, and the inside of the inner panel is covered with a trim, a required portion of the inner panel is provided. When a through hole is formed in the block, the block of the buffer body is passed through the through hole to be held at the hole edge, and a part of the block is positioned inside the closed structure, and when a load more than a predetermined value is applied from the trim, the block There is proposed a structure in which the vehicle is pushed into the closed structure to be deformed, and thereby the impact applied from the pillar to the occupant is absorbed (Japanese Utility Model Laid-Open No. 5-19010).

[0003]

Structural members such as pillars must have great rigidity. As one way to obtain that great rigidity, the inner panel is formed to have a convex shape toward the trim, and the outer panel is made to have a convex shape in the direction opposite to the inner panel, so that the effective area of the cross section cut by the virtual plane is increased. May be larger. On the other hand, the interior material such as trim or garnish that covers the inner panel inwardly has a smooth shape. Therefore, when the interior material is attached, a considerably large space exists between the interior material and the inner panel of the structural member.

In the case of absorbing the impact exerted from the structural member by utilizing the displacement of the interior material, it is preferable to utilize the displacement to the maximum, but if the gap exists, it is within a range corresponding to the size. , There is no substantial shock absorption, or even a little. As a result, the characteristic of the load F with respect to the displacement amount, that is, the stroke amount S is A in FIG.
become that way. In this case, the rising of the load is low, the peak load F ₁ is high accordingly, and the maximum stroke amount S ₁
Is big.

An object of the present invention is to provide a structure for absorbing the impact exerted by the structural member of the automobile, which contributes to the impact absorption from the beginning of the displacement of the interior material and can improve the characteristic of the load with respect to the stroke amount.

[0006]

According to the present invention, there is provided a structural member for an automobile, comprising a structural member formed by joining flanges of an inner panel and an outer panel to each other, and an interior material arranged inside the inner panel. A structure for absorbing the impact exerted by the inner panel, the portion of the inner panel excluding the flange having a plurality of deformable convex portions that are provided substantially uniformly and project toward the interior material. .

In this case, a plurality of weak portions may be provided at the base of each of the convex portions.

The present invention is also a structure for absorbing a shock exerted from the structural member of an automobile including a structural member formed by an inner panel and an outer panel and an interior material arranged inside the inner panel. The interior material is a skin layer that is a design surface that is spaced from the inner panel, a foam layer that is disposed within the spacing, a plate-shaped portion that is disposed adjacent to the skin layer, and the plate-shaped portion. The resin boss plate has a plurality of breakable boss portions projecting from the portion toward the inner panel and is embedded in the foam layer.

The inner panel is bent so that a cross section cut along an imaginary plane is convex toward the interior material, and is a plurality of plane portions defined by a plurality of ridge lines extending in a direction intersecting the imaginary plane. A plurality of the plate-shaped portions of the boss plate are provided so as to be opposed to at least two flat surface portions of the plurality of flat surface portions, and the plurality of boss portions of the boss plate are The plate-shaped portions may be arranged so as to extend toward the opposed flat surface portions and be distributed along the ridge lines.

[0010]

[Operations and Effects] When the inner panel has a plurality of convex portions, when a load larger than a predetermined amount is applied to the interior material by the body of the occupant, particularly the head, the interior material is displaced toward the inner panel of the structural member, The convex part provided on the panel is deformed. This absorbs the impact exerted by the structural member.

As a result of projecting the convex portion from the inner panel toward the interior material, the distance between the convex portion of the inner panel and the interior material can be made zero or as small as possible, and the displacement of the interior material Since the convex part is deformed,
The rise of the load with respect to the stroke amount of the interior material can be made rapid. As a result, it is possible to obtain absorption characteristics with a low peak load and a small maximum stroke amount.

When the convex portion has a plurality of weak bodies at its root, the convex portion can be surely deformed. Also,
The shock absorption characteristics can be adjusted by changing the number, shape, and size of the weak parts.

When the interior material includes a skin layer, a foam layer, and a boss plate, when a load larger than a predetermined value is applied to the interior material from the head of the occupant, the plate-shaped portion receives the load and the plurality of boss portions are received. Press on the inner panel. As a result, the boss portion is broken, and at the same time, the foam layer is compressed and deformed. by this,
Absorbs the impact exerted by the structural members.

As a result of projecting a plurality of boss portions from the plate-like portion of the boss plate of the interior material toward the inner panel, the distance between the boss portion and the inner panel can be made zero or as small as possible. Since the boss portion is broken by the displacement of the interior material and the foam layer is compressed and deformed, the rise of the load with respect to the stroke amount of the interior material can be made rapid. As a result, it is possible to obtain absorption characteristics with a low peak load and a small maximum stroke amount.

When a plurality of plate-like portions of the boss plate are provided,
Depending on the structural member, the load expected to be applied by the occupant may be limited to a specific direction, but it can be effectively carried out in such a structural member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a shock absorbing structure includes a structural member 14 formed by joining flanges 11A and 11B of an inner panel 10 and flanges 13A and 13B of an outer panel 12 facing each other. Inner panel 1
It absorbs a shock exerted from the structural member 14 of the automobile having an interior material 16 arranged inward of 0.

In the illustrated embodiment, the structural member 14 is the front pillar of the vehicle body, and the rigidity is enhanced by the reinforcing panel 18 arranged between the inner panel 10 and the outer panel 12. The flange 19A of the reinforcing panel 18 is interposed between the flanges 11A and 13A, and the flange 19B of the reinforcing panel 18 is interposed between the flanges 11B and 13B, and spot welding is performed to join the structural member 14 with an oblique virtual surface. The cut cross section is formed to have a closed structure. Then, in order to increase the effective area of the cross section, the inner panel 10 is convex inward, and the outer panel 12 is convex outward. As a result, the inner panel 10
Is a central plane portion 20 divided by a plurality of ridge lines extending in a direction intersecting the virtual plane and a front plane portion 21.
And a rear planar portion 22.

The flanges 11A, 11 of the inner panel 10
The portion excluding B is provided substantially uniformly, and the interior material 16
It has a plurality of deformable protrusions 24 protruding toward.

In the embodiment of FIG. 1, the convex portions 24 are uniformly provided on the entire surface of the inner panel 10 excluding the flange, that is, the central plane portion 20, the front plane portion 21 and the rear plane portion 22. Most of the load F applied from the occupant's head is determined from the positional relationship between the front pillar 14 and the occupant as shown in FIG.
In the case of joining in the direction of the arrow, as shown in FIG. 2, the plurality of convex portions 24 can be uniformly provided only on the central plane portion 20 of the inner panel 10. The portion of the inner panel excluding the flange has a plurality of substantially uniformly provided protrusions, which means that both aspects are included. In addition, “substantially uniform” does not mean that the shapes and dimensions of the convex portions are uniform, and even if any portion of the interior material is displaced, the convex portions are formed to such an extent that they can contact the interior material from the initial stage of displacement. Means distributed.

The projections 24 are provided uniformly in the direction in which the ridge extends, but in particular, when a load greater than a predetermined amount applied from the head of the occupant is targeted, it is provided on the inner panel 10 above the shoulder of the occupant. You can just do it.

The protrusion 24 has a shape which is easily deformed in consideration of the protrusion length L and the diameter D of the root, but the protrusion length L thereof.
Is as close as possible to the interior material 16, or the interior material 1
It is preferable to contact No. 6. For example, when the inner panel 10 of the front pillar 14 has a thickness of 1 mm, the protrusion length L of the convex portion 24 in the central plane portion 20 can be set to about 10 mm, and the root diameter D can be set to 5 to 10 mm. In the front flat portion 21 and the rear flat portion 22, the protrusion length L of the convex portion 24 is set to about 20 mm, and the root diameter D is set to 15 mm.
Can be ~ 20mm. The shape of the protrusion 24 can be a substantially conical shape or a truncated cone shape.

As shown in FIG. 3, by providing a plurality of weak bodies at the root of each convex portion 24, that is, at the rising portion from the flat portion, the convex portion 24 can be reliably deformed. The weak body portion 26 of FIG.
It is an arc-shaped slit opened substantially coaxially with 4. on the other hand,
The weak body portion 28 in FIG. 6B is a hole opened so that the spiral connecting portion 29 remains at the root of the convex portion 24. The weak part is the convex part 2
It is also possible to form an arcuate concave portion in which the root of No. 4 is recessed so as to be opposite to the convex portion.

The interior material 16 is a pillar garnish in the illustrated embodiment. The pillar garnish 16 is formed by molding a hard resin such as polyethylene, and a clip known per se attached to a portion where a load is not applied by an occupant is inserted into the inner panel 10 or the convex portion 24.
Any of the above is enlarged, and a clip is inserted here to be attached to the inner panel 10.

A windshield glass 30 is attached to the front of the front pillar 14, and a door 32 is attached to the rear of the front pillar 14 so as to be openable and closable. When the load F is applied from the head of the occupant, the interior material 16 is displaced and the convex portion 24 is deformed. At this time, since the interior material 16 and the convex portion 24 are substantially in contact with each other, the load F suddenly rises with a slight stroke amount S as shown in B of FIG. 7. As a result, the peak load becomes F ₂ and the maximum stroke amount becomes S ₂ . This is derived from the equal relationship between the work amount or energy given by the area under the curve A and the work amount or energy given by the area under the curve B.

The shock absorbing structure shown in FIG. 4 includes the structural member 44 formed by the inner panel 40 and the outer panel 42, and the interior member 46 arranged inside the inner panel 40. It absorbs the impact that is exerted.

In the illustrated embodiment, the structural member 44 is the center pillar of the vehicle body, and the flange 4 of the inner panel 40.
1A and 41B and the flanges 43A and 43B facing each other of the outer panel 42 are spot-welded and joined together, and the cross section cut along a horizontal imaginary plane is formed to have a closed structure.

The interior material 46 is a pillar garnish,
Skin layer 4 which is the design surface with a distance W from the inner panel
8, a foam layer 49 arranged within the space W, and a boss plate 50 made of resin. The boss plate 50 has a plate-shaped portion 51 arranged adjacent to the skin layer 48, and a plurality of breakable boss portions 52 projecting from the plate-shaped portion 51 toward the inner panel 40, and has a foam layer. It is buried in 49.

The interval W has a size of 15 to 30 mm. The plate-shaped portion 51 and the plurality of boss portions 52 are injection-molded so as to have a size that fits in the space W to obtain the boss plate 50, and the boss plate 50 is insert-molded in a foaming agent such as urethane to be hard. A urethane foam layer 49 is obtained. Thereafter, the foam layer 49 and the boss plate 50 are covered with a skin layer 48 of resin such as polyvinyl chloride, cloth or synthetic leather, and the interior material 46 is formed. The boss portion 52 has a cylindrical shape or a truncated cone shape having a diameter of 10 to 20 mm, and a large number of boss portions 52 are provided at substantially constant intervals.

In the embodiment of FIG. 4, the inner panel 40 is
A plurality of (three in the illustrated embodiment) planes that are bent so that the cross section cut along the imaginary plane is convex toward the interior material 46 and are divided by a plurality of ridge lines extending in a direction intersecting the imaginary plane. It has portions 54, 55, 56. On the other hand, the plate-shaped portions 51 of the two boss plates 50 are located so as to face the two plane portions 54 and 56. The plurality of boss portions 52 of the boss plate 50 are the flat surface portions 5 that the plate-shaped portions 51 face each other.
It is arranged so as to extend toward 4, 56 and be distributed along the ridgeline. In the illustrated embodiment, the two boss plates 50 are separate bodies, but they can also be integrally molded. In addition, one flat portion of the inner panel 40
It is also possible to arrange the boss plates 50 so that the two plate-shaped portions 51 face each other.

When a load is applied from the head of the occupant, the interior material 4
6 is displaced, the boss portion 52 is broken, and at the same time, the foam layer 49
Is compressed and deformed. At this time, the foam layer 49 of the interior material 46
Since the boss portion 52 and the inner panel 40 are substantially in contact with each other, the load F suddenly rises with a slight stroke amount S, as in the case of FIG. 7B. As a result, absorption characteristics with a low peak load and a small maximum stroke amount can be obtained.

As shown in FIG. 6, in addition to the front pillar 14, the center pillar 44, and the rear pillar 60, the vehicle body includes a roof side rail 62 extending in the front-rear direction so as to connect upper portions of these pillars, and a width of the vehicle body. Although there are structural members such as header panels 64 that extend in either the right or left direction, the present invention is able to absorb the impact exerted by such structural members.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a structure for absorbing a shock exerted by a structural member of an automobile according to the present invention, which is 1-1 of FIG.
It is cut along a line.

FIG. 2 is a perspective view of the inner panel used in the shock absorbing structure of FIG. 1 as viewed from the inside.

FIG. 3 is a front view showing a convex portion and a weak body portion, and a and b show different embodiments.

FIG. 4 is a perspective view showing another embodiment of the structure for absorbing the impact exerted by the structural member of the automobile according to the present invention.

5 is a perspective view of a boss plate used in the shock absorbing structure of FIG.

FIG. 6 is a side view of a vehicle body of an automobile capable of implementing the structure for absorbing the impact exerted by the structural member of the automobile according to the present invention.

FIG. 7 is a characteristic diagram qualitatively showing a relationship between a stroke amount and a load.

[Explanation of symbols]

 10, 40 Inner panel 12, 42 Outer panel 14 Structural member (front pillar) 16, 46 Interior material (pillar garnish) 24 Convex portion 26, 28 Weak body portion 44 Structural member (center pillar) 48 Skin layer 49 Foam layer 50 Boss plate 51 Plate portion 52 Boss portion 54, 55, 56 Plane portion

Claims (4)

[Claims] 1. A structure for absorbing a shock exerted from the structural member of an automobile, which comprises a structural member formed by joining flanges of an inner panel and an outer panel, respectively, and an interior material arranged inside the inner panel. The part of the inner panel excluding the flange is provided substantially uniformly, and has a plurality of deformable protrusions protruding toward the interior material, and extends from a structural member of an automobile. Shock absorbing structure. 2. The structure for absorbing the impact exerted by the structural member of the automobile according to claim 1, wherein a plurality of weak bodies are provided at the root of each of the convex portions. 3. A structure for absorbing a shock exerted from the structural member of an automobile, comprising: a structural member formed by an inner panel and an outer panel; and an interior material arranged inside the inner panel. The material is a skin layer serving as a design surface spaced from the inner panel, a foam layer arranged in the space, a plate-shaped portion arranged adjacent to the skin layer, and the plate-shaped portion from the plate-shaped portion. A structure for absorbing a shock exerted from a structural member of an automobile, which has a plurality of breakable boss portions protruding toward an inner panel and includes a resin-made boss plate embedded in the foam layer. 4. The inner panel is bent so that a cross section cut along an imaginary plane is convex toward the interior material, and is divided into a plurality of ridge lines extending in a direction intersecting the imaginary plane. A plurality of flat portions, the plate-shaped portions of the boss plate are provided so as to face at least two flat portions of the plurality of flat portions, and the plurality of boss portions of the boss plate are The structure for absorbing the impact exerted by the structural member of the automobile according to claim 3, wherein the plate-shaped portions are arranged so as to extend toward the flat surface portion facing each other and are distributed along the ridgeline.