JPH06270677A - Shock absorbing structure for vehicle side part - Google Patents

Abstract

PURPOSE:To provide a shock absorbing structure for a vehicle side part, which is excellent in a shock absorbing characteristic and which enables the displace ment of a pad used in the structure, to be large upon the initial stage of a shock but restrains the same to a small value upon the final stage of the shock. CONSTITUTION:The structure of a shock absorbing pad 30 applied on the rear side of a door trim 10 comprises an initial load absorbing stepped part 32 formed in a part of the outer surface of a base part 31 and projected toward a panel 2, and the shape of the stepped part 32 is changed, thereby it is possible to adjust the shock absorbing characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing structure for a side portion of a vehicle, which is designed to absorb the impact when a lateral impact such as a side collision is applied to the vehicle.

[0002]

2. Description of the Related Art Normally, a side wall panel of a vehicle body, for example, a door panel is provided with a door trim, and a side seat of a rear passenger of a two-door vehicle is provided with interior parts for automobiles such as a rear side trim. It is equipped with a cushioning function that ensures the safety of passengers against side impacts such as side impacts.

The structure of a conventional automobile door trim will be described with reference to FIG. 7. First, the automobile door trim 2 installed on the interior side of the door panel 1 has shape retention and mounting rigidity to the door panel 1. The core material 3 is formed into a desired curved surface shape, and a skin material 4 that is integrally attached to the surface of the core material 3 to provide cushioning and decorative properties. A shock absorbing pad 5 made of an elastic material such as expanded polystyrene is adhered to the location.

The cushioning property of the skin member 4 absorbs a relatively small impact, and the strong impact such as a side impact is absorbed by the deformation of the door panel 1 having a hollow structure. The function, the shock absorbing function due to the deformation of the bulging portion such as the waist portion and the armrest portion in the door trim 2, and the shock absorbing function due to the elastic action of the shock absorbing pad 5 adhered to the back surface of the core material 3 act organically, The impact load from the side such as a side impact is alleviated to protect the safety of passengers.

[0005]

Among these shock absorbing means, particularly the shock absorbing pad 5, the shock absorbing performance thereof is proportional to the shock load applied to the vehicle as shown in FIG. Although the displacement amount tends to increase linearly, the ideal impact absorption characteristic is that the displacement amount of the impact absorption pad is large with respect to the initial impact load as indicated by the dotted line in the graph of FIG. It is preferable to control the impact load so that the amount of displacement is small.

[0006] In particular, if the shock absorbing pad 5 installed on the waist of the interior part where the shoulders and chest of the occupant are easily touched can be provided with an ideal shock absorbing characteristic, a comfortable riding comfort by soft touch can be guaranteed, and It is also excellent in terms of safety.

The present invention has been made in view of such circumstances, and in a shock absorbing structure of a vehicle side part in which a shock absorbing pad is installed on the back surface of an interior part, by changing the shape of the shock absorbing pad, For the purpose of providing a shock absorbing structure on the side of a vehicle, which has an ideal shock absorbing characteristic in which the amount of displacement of the pad is large with respect to the load and the amount of displacement of the pad can be adjusted small with respect to the impact load that continues thereafter. There is.

[0008]

In order to achieve the above object, according to the present invention, a shock absorbing pad is attached to the back surface of an interior part that is installed on the interior side of a vehicle body panel, and a shock load is applied by the shock absorbing pad. In the vehicle side impact absorbing structure, the impact absorbing pad includes a base portion attached to a back surface of an interior part and an initial load projectingly formed on a part of a surface of the base portion toward a vehicle body panel side. It is characterized in that it is composed of a step portion for absorbing and that the absorption characteristic of the impact load can be adjusted by changing the shape of the step portion.

Further, the shock absorbing pad may be adhered to an appropriate place on the back surface of the interior part, but when it is adhered to the back surface of the waist part, the impact absorption pad can be applied to the occupant such as the shoulder or chest of the occupant. If it is installed in a place where the repulsive stress of is easily concentrated, the effect will be great.

[0010]

As is apparent from the above structure, the shock absorbing pad attached to the interior parts has the base portion and the step portion for absorbing the initial load protruding from the surface of the base portion toward the vehicle body panel side. Therefore, only the step portion is crushed against an initial impact, and after the step portion bottoms out, the base portion of the shock absorbing pad is crushed.

Therefore, the amount of displacement is large at the initial stage of the impact, and the amount of displacement can be adjusted to a small amount with respect to the impact load that continues thereafter, and ideal impact absorption characteristics can be obtained.

Further, the shock absorption characteristics for the initial load can be adjusted by arbitrarily setting the dimension of the step portion, so that an appropriate shock absorption performance can be selected together with the strength of the vehicle body panel and the rigidity of the interior parts.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle side impact absorbing structure according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an automobile door trim to which a shock absorbing structure according to the present invention is applied, and FIG. 2 is a sectional view showing a state in which the automobile door trim is attached to a vehicle body panel.
FIG. 3 is an explanatory view showing a shock absorbing pad used in the shock absorbing structure according to the present invention and a mounting state thereof, FIGS. 4 and 5 are sectional views showing a compressed state of the shock absorbing pad at the time of a side collision, and FIG. 7 is a graph showing the action of the shock absorbing pad used in the shock absorbing structure according to the present invention, and is a graph showing the correlation between the shock load and the displacement amount of the pad.

1 and 2, an automobile door trim 10 is mounted on an interior side of a door panel 20, and the automobile door trim 10 has shape retention and a door panel 20.
A core material 11 having a mounting rigidity with respect to the core material 11, and a skin material 12 having cushioning and decorative properties on the surface of the core material 11.
Is integrally attached.

More specifically, the core material 11 is formed by extruding a polypropylene resin mixed with wood powder filler into a sheet shape by a T-die extrusion molding machine, and forming a sheet-shaped product in a cold press molding die having a required die surface shape. Then, the waist portion 13 and the armrest portion 14 are formed into a required shape so as to have a curved surface.

As the skin material 12, a laminated sheet having an excellent cushioning property, in which a foam layer such as polyethylene foam is lined on the back surface of the vinyl chloride sheet, is used, and the skin material 12 is integrally formed on the front surface side of the core material 11 by vacuum forming. It is attached.

The vehicle door trim 10 is attached to the door panel 20 through a predetermined clearance. The feature of the present invention is that the impact against a relatively large impact such as a side impact is applied from the side. The door trim 1 is equipped with a shock absorbing pad 30 having an excellent shock absorbing characteristic capable of effectively absorbing heat.
The feature is that it is installed on the back side.

As shown in FIG. 3, the shock absorbing pad 30 has a base portion 31 attached to the back side of the door trim 10.
And a step portion 32 for integrally absorbing the initial load, which is integrally formed on a part of the surface of the base portion 31 (the surface facing the door panel 20 side) and projects toward the door panel 20 side.

Therefore, the operation of the shock absorbing pad 30 used in the present invention will be described with reference to FIGS. 4 and 5. First, for the initial shock applied from the side, FIG.
As shown in FIG. 5, the step portion 32 of the shock absorbing pad 30 is compressed and deformed, and the base portion 31 remains substantially in its original shape. And
Since the vertical dimension of the step portion 32 is set smaller than that of the base portion 31, the displacement amount of the step portion 32 is large,
The amount of displacement of the shock absorbing pad 30 is large relative to the initial shock (relatively weak shock value), and the shock applied to the occupant can be effectively absorbed.

For a further continuous impact load, see FIG.
As shown in, the step portion 32 bottoms out, and this time the base portion 3
1 is compressed and deformed, but since the contact area of the base portion 31 is large, the shock absorbing pad 30 against an applied impact load
The displacement amount of can be kept small.

As described above, the shock absorbing characteristics of the shock absorbing pad 30 used in the present invention are ideal, close to the graph indicated by the dotted line in FIG.

Further, a feature of the present invention is that the step 32 of the shock absorbing pad 30 is made variable in size,
The point is that the shock absorption characteristics can be adjusted.

Next, the impact absorption characteristics of the impact absorption pad 30 used in the present invention and the conventional block-shaped impact absorption pad will be shown in comparison.

At this time, the shock absorbing pad 30 shown in FIG.
The values of Table 1 are applied as the A dimension and the B dimension of Examples 1, 2 and 3, respectively, and the dimension of the conventional shock absorbing pad,
The size is 133 × 220 × 150 mm.

[0026]

[Table 1] Then, as is clear from the graph of FIG.
Reference numerals 2 and 3 respectively represent ideal shock absorption characteristics that represent a two-step waveform, and it is easy to arbitrarily adjust the shock absorption characteristics by changing the size of the step portion 32 of the shock absorption pad 30. Can understand.

Therefore, in addition to the shock absorbing function due to the hollow structure of the door panel 20 and the shock absorbing function due to the deformation of the door trim 10, an appropriate shock absorbing characteristic of the shock absorbing pad 30 can be freely set.

Although the shock absorbing pad 30 is installed on the back surface of the waist portion 13 of the door trim 10 in this embodiment, it may be installed below the door trim 10 to protect the waist of the occupant. Shock absorption pad 3 to be used
Considering the shock absorption characteristics of 0, it is optimal to install it on the waist portion 13 to protect the shoulder and chest of the occupant.

In the above, the embodiment in which the vehicle side impact absorbing structure according to the present invention is applied to the automobile door trim 10 has been described. However, the present invention is applied to the rear side trim mounted to the side of the rear seat occupant such as a two-door vehicle. May be applied.

[0030]

As described above, the vehicle side impact absorbing structure according to the present invention has the following operational effects.

(1) Displacement of the shock absorbing pad with respect to the initial load by setting a step portion for absorbing the initial load on a part of the surface of the base portion as the shock absorbing pad attached to the back surface of the interior part. The large amount is secured, and the displacement amount of the shock absorbing pad is kept small with respect to the continuous impact load, so that it is possible to obtain appropriate shock absorbing performance against side impacts such as side impacts. Have an effect.

(2) By varying the dimension of the step portion for absorbing the initial load provided on the base portion, the shock absorbing performance of the initial load can be adjusted, and the strength of the door panel,
Combined with the rigidity of the door trim, it has the effect that comprehensive shock absorption measures can be taken.

(3) According to the second aspect of the present invention, if the present invention is applied to the shock absorbing pad installed on the waist portion of the interior part, good shock absorbing is achieved at a place where the shoulder and chest of the occupant touch. In addition to the characteristics being obtained, there is an effect that a comfortable riding comfort due to soft touch can be guaranteed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an automobile door trim to which the present invention is applied.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an explanatory view showing a state where the shock absorbing pad used in the present invention is attached to the back surface of the door trim.

FIG. 4 is a cross-sectional view showing an operation of the vehicle side impact absorbing structure according to the present invention, showing a state of absorbing an initial impact.

FIG. 5 is a sectional view showing the operation of the vehicle side impact absorbing structure according to the present invention, showing a state of absorbing impact in the latter half of the period.

FIG. 6 is a graph showing a correlation between impact load and displacement amount in the impact absorbing pad used in the present invention.

FIG. 7 is a cross-sectional view showing a state in which a conventional automobile door trim is attached to a door panel.

FIG. 8 is a graph showing the impact absorption characteristics of a conventional impact absorption pad.

[Explanation of symbols]

 10 Automotive Door Trim 11 Core Material 12 Skin Material 13 Waist Part 20 Door Panel 30 Impact Absorption Pad 31 Base Part 32 Step Part

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

Claims (2)

[Claims] 1. A shock absorbing pad (30) is attached to the back surface of an interior component (10) which is internally fitted to the interior of a vehicle body panel (20), and the shock absorbing pad (30) absorbs a shock load on the vehicle side. In the shock absorbing structure of the base part, the shock absorbing pad (30) includes a base part (31) attached to the back surface of the interior component (10) and the base part (3).
1) A step portion (32) is formed on a part of the surface so as to project toward the vehicle body panel (20) side for absorbing an initial load, and the shape of this step portion (32) is variable. The shock absorbing structure on the side of the vehicle is characterized in that the shock absorbing characteristics can be adjusted. 2. The waist portion (13) of the interior component (10).
The vehicle side shock absorbing structure according to claim 1, wherein the shock absorbing pad (30) is provided on the back surface to reduce the shock applied to the shoulder and chest of the occupant.