JP5003973B2 - Shock absorbing member and vehicle door trim including the same - Google Patents

Description

  The present invention relates to an impact absorbing member and a vehicle door trim having the back surface mounted thereon.

2. Description of the Related Art Conventionally, there is a disclosure (see, for example, Patent Document 1) of a technique for improving protection performance for a seated person sitting on a seat in a vehicle. According to this, by installing an impact absorbing member on the back side of the door trim, the impact energy generated by the seated person coming into contact with the door trim at the time of another vehicle collision (hereinafter referred to as a side collision) on the side of the door is reduced. Absorbs and relaxes, reducing the impact on the seated person.
Japanese Patent No. 3314247

  The impact absorbing member mainly reduces the impact on the waist of the seated person. Usually, the mounting position is set corresponding to the waist of a seated person of a standard body type (so-called dummy doll). . However, the standard physique or protection performance (dummy doll behavior at the time of a side collision, the magnitude of the moment around the hip point, etc.) is different in each country, and if the destination is different, it corresponds to that. Therefore, it is necessary to provide a dedicated impact absorbing member having a different covering range. On the other hand, in order to reduce the cost of the vehicle, it is preferable to make the components to be shared as much as possible, and to make the door trim main body to which the shock absorbing member is attached common.

In this case, for example, the large-type shock absorbing member (with a size covering from the seated person's waist to the thigh) 30 in FIG. 1 and the small-type shock absorbing member (in the vicinity of the seated person's waist) in FIG. In order to selectively mount a cover door 100) to a common door trim body, the seat surface of the door trim body (seat surface to which the shock absorbing member is attached) is aligned with the shock absorbing member 30 on the larger side. And make it wider. However, when the seat surface is simply widened, when the shock absorbing member 100 on the small side is attached, the front side (G portion in FIG. 8) of the seat surface does not overlap, and the back side becomes completely hollow. As a result, when pushed from the passenger compartment side to the outside of the vehicle, the door trim body may be deformed in a curved shape as shown by the one-dot chain line in FIG. Will be lost.
The present invention has been completed based on the above circumstances, and an object of the present invention is to make a door trim main body common to two types of shock absorbing members of a small type and a large type, which have different required performances for seated person protection.

  The impact absorbing member of the present invention is an impact absorbing member attached to a seat surface formed on the back surface opposite to the door panel, out of both the front and back surfaces of the door trim body covering the indoor side of the door panel located on the side of the seat. A body part attached to the rear part of the seat surface of the door trim main body, which is on the side of the waist of the seated person seated on the seat, and an extending part extending forward from the main body part and overlapping the front part of the seat surface In addition, a low-rigidity portion having a lower rigidity than the others is provided along the boundary between the main body portion and the extending portion.

The following configuration is preferable as an embodiment of the present invention.
The low-rigidity portion is configured by forming a groove along the boundary. If it does in this way, a low-rigidity part can be simultaneously formed with a main-body part and an extending part irrespective of secondary processing.

-Let the said extension part be a shape thinner than the said main-body part. If done in this way, the volume of the entire shock absorbing member is smaller than when the extension portion has the same thickness as the main body, so for example, when molding the shock absorbing member by foaming, It is possible to reduce the amount of the synthetic resin material and the foaming agent to be added, and it becomes easier to manage the foaming pressure, internal stress, and the like.

  In the vehicle door trim according to the present invention, the impact absorbing member according to any one of the above aspects of the present invention is mounted on the seat surface formed on the back surface of the door trim body that covers the inside of the door panel located on the side of the seat. Do it.

  The impact absorbing member of the present invention (corresponding to the small type impact absorbing member described in the problem) is provided with an extending portion. In this way, even if the door trim main body has a seat surface that is wide enough to mount the large-type shock absorbing member described in the problem, it extends to the front portion of the seat surface. As a result of the overlapping of the installation parts and the main body part overlapping the rear part of the seating surface, a portion having low rigidity cannot be formed in the entire seating surface. Therefore, even if the said part is pushed with a finger etc. from the compartment side, it does not bend and the dignity of a door trim is not lost.

  In addition, since the low-rigidity part is provided along the boundary between the main body part and the extension part, the impact is applied to the seated person as a result of the boundary breaking and the extension part separating from the main body part at the time of a side collision. Is substantially equivalent to relaxing the body part alone. Therefore, with respect to the performance related to the protection of the seated person at the time of a side collision, it is possible to guarantee the same performance as that of the shock absorbing member originally composed of only the main body (that is, the small type shock absorbing member).

  And since it is also possible to attach a large type shock absorbing member instead of this shock absorbing member that functions as a small type with respect to the seating surface of the door panel body described above, according to the present invention, The door trim main body can be made common to two impact absorbing members having different required performances.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view of a vehicle door trim (right seat side) having a first impact absorbing member 30 mounted on the back surface. 2 is a cross-sectional view taken along line AA in FIG. The vehicle door trim DT is attached to the interior side of a door panel (not shown) that is attached to the vehicle body so as to be freely opened and closed, and functions as an interior material of the door panel.

  The vehicle door trim DT includes a door trim body 11 that is sized to cover the lower half (region below the window frame) of the door panel. In the following description, the front side refers to the side exposed in the passenger compartment (lower side in FIG. 2), and the back side refers to the side opposite to the door panel (upper side in FIG. 2). To do.

  The door trim main body 11 is made of a synthetic resin, and an armrest portion 12 used as a passenger's armrest is formed on an upper portion on the surface side which is a passenger compartment side, and a pocket P is formed below the armrest portion 12.

  The pocket P is formed by attaching a back cover 15 constituting the inner wall surface of the pocket P to the back surface of the door trim main body 11, and as shown in FIG. 1, a range slightly closer to the center from the front end of the door trim main body 11. Is provided. And the flat seat surface 20 is formed in the back side of this pocket P, The structure which can attach the 1st shock absorption member 30 and the 2nd shock absorption member 50 alternatively to the back surface side, It has become.

  The first shock absorbing member 30 is made of a hard foam material obtained by foaming a synthetic resin material such as urethane or a polypropylene to which a foaming agent is added to about 15 to 45 times, and is a block long in the vehicle longitudinal direction. Make a mold. The first shock absorbing member 30 is attached to the seat surface 20 behind the pocket P with its longitudinal direction facing back and forth, and covers the side of the thigh from the waist of a passenger seated on a seat (not shown). It has become. The first impact absorbing member 30 has a function of protecting the seated person seated on the seat by absorbing impact energy generated when the seated person comes into contact with the door trim at the time of a side collision. In addition, the code | symbol HP in FIG. 1 is a passenger's hip point.

  Further, the mounting surface 31 of the first shock absorbing member 30 facing the seat surface 20 of the door trim main body 11 is a substantially flat plane, and as shown in FIG. The mounting surface 31 on the first shock absorbing member 30 side is in close contact and overlapped. The shock absorbing member 30 is attached to the door trim main body 11 by, for example, inserting a screw seat 27 formed on the seat surface 20 of the door trim main body 11 into the shaft hole of the mounting seat 37 provided in the outer peripheral portion of the shock absorbing member 30. In this embodiment, the impact absorbing member 30 is placed at three points (one at the front center) with respect to the seating surface 20 of the door trim main body 11. Point and 2 points on the rear side). In addition to this fastening method using screws, the tip of the boss protruding from the shaft hole by inserting the screw seat 27 as a boss into the shaft hole of the mounting seat 37 may be fastened by a heat caulking structure.

  Next, the second impact absorbing member 50 will be described. FIG. 4 is a front view of a vehicle door trim (right seat side) DT in which the second shock absorbing member 50 is attached to the back surface side. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a perspective view of the second shock absorbing member 50. In FIG. 6, the second shock absorbing member 50 is illustrated for the left seat, but the right seat is symmetrical with the right seat.

  Now, the second impact absorbing member 50 includes a main body 51 and an extending portion 55 formed integrally with the main body 51. The second impact-absorbing member 50 is made of a hard foam material obtained by foaming a synthetic resin material such as urethane or a polypropylene provided with a foaming agent about 15 to 45 times, and the first impact-absorbing member 30 and A mounting seat 37 is formed at the same position, and is attached to the seat surface 20 of the door trim main body 11 by being fastened at three points in the same manner as the first shock absorbing member 30.

  The main body 51 constituting the second shock absorbing member 50 corresponds to the small-type shock absorbing member 100 described with reference to FIG. 8, and as shown in FIG. 4, the seat surface of the door trim main body 11. It is located at the rear portion 20R and covers the side of the waist of the seated person seated on the seat (not shown).

  The extending portion 55 extends from the main body portion 51 toward the front side of the vehicle, and overlaps with the central portion of the seat front portion 20F. The shape of the extended portion 55 is as shown in FIG. 4 and is roughly rectangular when viewed from the front. The extension portion 55 is set to have a vertical dimension shorter than that of the main body portion 51. The lower end of the extension portion 55 is above the lower end of the main body portion 51, and there is a step between the two. Yes. In addition, the base end side of the upper portion of the extended portion 55 is inclined and is continuous with the upper end of the main body portion 51.

  The main body 51 and the extended portion 55 have flat mounting surfaces 52 and 56 facing the seat surface 20 of the door trim main body, and as shown in FIG. 5, the extended portion 55 is a front portion of the seat surface. The main body 51 overlaps with the rear surface 20R of the seating surface in close contact with the 20F. Moreover, the main body 51 and the extending portion 55 have different thicknesses with respect to the mounting surfaces 52 and 56. As shown in FIG. The thickness is set to about half.

  This is because the main body 51 mainly has an impact absorbing function for reducing the impact on the seated person at the time of a side collision, whereas the extending portion 55 is used to compensate for the insufficient rigidity of the seat front portion 20F. This is because it functions as a reinforcing material, and the required functions differ between the two.

  Further, a low-rigidity portion 71 having a lower rigidity than the others is formed at the boundary between the main body portion 51 and the extending portion 55. More specifically, a V-shaped bead (V-shaped groove) BD1 is formed at the boundary between both the portions 51 and 55. The bead BD1 extends straight up and down along the boundary line L between both the portions 51 and 55, and its upper end passes through the upper end surface of the extending portion 55 and its lower end passes through the lower end surface of the extending portion 55. (See FIG. 6). By adopting such a configuration, the boundary between the two portions 51 and 55 has a low thickness over the entire height, and has a lower rigidity than the other (in other words, a fragile portion that is weaker and weaker than the other). ) 71.

  Also, the extended portion 55 is formed with a bead BD2 similar to that formed at the boundary, and is provided with a portion having low rigidity. The bead BD2 is located at substantially the center (the center in the height direction) of the extended portion 55 and extends horizontally, and one end reaches a mounting seat 37 formed on the front end side of the extended portion 55, The other end reaches the bead BD1 formed at the boundary between the extended portion 55 and the main body portion 51. Both the beads BD1 and BD2 are formed on the mounting surface side facing the seat surface 20 of the door trim main body 11.

Next, the effect of this embodiment will be described.
According to the present embodiment, since the extended portion 55 is provided in the second shock absorbing member 50 for small type, either the small type or large type shock absorbing member 30 with respect to the door trim DT. , 50 is usually in a state in which the shock absorbing members 30, 50 overlap with almost the entire area of the seating surface 20. Therefore, even if the user presses the seat surface 20 of the vehicle door trim DT with a finger from the passenger compartment side, the same portion does not bend inward, and it is possible to avoid degrading the quality of the door trim DT.

  In addition, the second shock absorbing member 50 has a low-rigidity portion 71 formed along the boundary between the main body portion 51 and the extending portion 55. In this way, the second shock absorbing member 50 that is compressed by applying force from both sides in the thickness direction at the time of a side collision causes concentration of internal stress in the low-rigidity portion 71 and breaks there. The extended portion 55 is separated from the portion 51. In addition, since the bead BD2 is formed on the extended portion 55 to be separated and the rigidity is partially lowered, the breakage also occurs there, and eventually the extended portion 55 is shattered. To be crushed.

  Therefore, the impact applied to the seated person is substantially equivalent to mitigating by the main body 51 alone. Accordingly, with respect to the performance related to the protection of the seated person at the time of a side collision (for example, the behavior of the seated person, the moment around the hip point HP, etc.) Can be guaranteed.

  In short, in the present embodiment, when the door trim main body 11 is used in common for the two types of shock absorbing members of the small type and the large type having different required performances regarding the occupant protection, the problem of insufficient rigidity of the door trim main body 11 which becomes an obstacle is solved. By eliminating the shock absorbing member as a reinforcing material for the door trim body 11, the problem was solved. And about the extension part 55 provided for reinforcement, the low-rigidity part 71 is provided between the main-body parts 51 originally required in order to exhibit an impact absorption function, and it is made to isolate | separate at the time of a side collision. I made it. From the above, it has been realized that the door trim main body 11 is made common to the two small-type and large-type shock absorbing members 30 and 50 having different required shock absorbing performance.

  In addition, according to this thing, as mentioned above, since a part (specifically extension part 55) of the impact-absorbing member 50 is crushed at the time of a side collision, the energy of a side collision is absorbed by this crushing. Therefore, the effect of reducing the magnitude of the input load on the hip point HP of the seated person can be expected.

  Moreover, in this thing, the low-rigidity part 71 is formed by forming bead BD1 along the boundary line L of the main-body part 51 and the extension part 55. FIG. In this way, the low-rigidity portion 71 can be formed simultaneously with the forming of the main body portion 51 and the extending portion 55 without using secondary processing, and this point is also effective.

  Moreover, in this thing, the thickness of the extension part 55 is set to the minimum thickness required to compensate for the lack of rigidity of the seat front part 20F, and is made thinner than the main body part 51. is there. In this way, for example, the volume of the shock absorbing member as a whole can be reduced as compared with the case where the extending portion 55 has the same thickness as the main body portion 51. Therefore, the shock absorbing member 30 is foamed and molded. At this time, it is possible to reduce the amount of the synthetic resin material and the foaming agent to be added, and it becomes easier to manage the foaming pressure, internal stress, and the like.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above embodiment, as an example of a technique for forming the low-rigidity portion 71 having a lower rigidity than the others at the boundary between the main body portion 51 and the extending portion 55, a method of forming a bead has been exemplified. Alternatively, it is possible to form a low-rigidity part by inserting slits (intermittent break lines) along the boundary, or to form a low-rigidity part by forming a cavity inside. Moreover, even if it is a case by a bead, it is also possible to make a bead discontinuous.

Front view of a vehicle door trim according to the present embodiment (showing a case where a first shock absorbing member is attached) AA line sectional view in FIG. BB sectional view in FIG. Front view of vehicle door trim (shown with second shock absorbing member attached) AA line sectional view in FIG. Perspective view of the second shock absorbing member CC sectional view in FIG. Illustration explaining the problem AA line sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Door trim main body 20 ... Seat surface 20F ... Seat surface front part 20R ... Seat surface rear part 30 ... First impact absorbing member 50 ... Second impact absorbing member 51 ... Main body part 55 ... Extension part 71 ... Low rigidity part BD1 ... Bead (equivalent to the “groove” of the present invention)
BD2 ... Bead L ... Boundary line DT ... Vehicle door trim

Claims (4)

Of the front and back surfaces of the door trim body that covers the indoor side of the door panel located on the side of the seat, an impact absorbing member mounted on a seat surface formed on the back surface facing the door panel,
A main body portion attached to the rear portion of the seat surface of the door trim main body, which is on the side of the waist of a seated person seated on the seat;
The main body is provided with an extending portion that extends forward from the vehicle and overlaps the front portion of the seating surface,
An impact absorbing member, wherein a low-rigidity portion having a lower rigidity than the others is provided along a boundary between the main body portion and the extending portion.   The impact absorbing member according to claim 1, wherein the low-rigidity portion is configured by forming a groove along the boundary.   The impact-absorbing member according to claim 1, wherein the extension portion has a shape that is thinner than the main body portion.   The shock absorbing member according to any one of claims 1 to 3 is mounted on a seating surface formed on a back surface of a door trim main body that covers an inner side of a door panel located on a side of the seat. A vehicle door trim.

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