JP4338601B2 - Automotive door - Google Patents

Description

  The present invention relates to a structure of a door for an automobile, and more particularly to a technique of a side collision protection device that absorbs an impact during a side collision.

  Conventionally, as shown in FIG. 7, the automobile door 58 includes a door outer panel 54, a door inner panel 59, a door trim 57, and a panel member 53 that closes an opening 60 of the door inner panel 59. Japanese Patent Application Laid-Open No. H10-228667 discloses an assembly of an automobile door 58 that can be easily assembled by assembling various door functional parts such as a window glass regulator and a door lock mechanism.

Further, a shock absorbing member 52 composed of a plurality of collision absorbing ribs 51 as a side collision (side collision) protection device is formed so as to protrude on both sides of the panel member 53, and the shock absorbing member 52 is formed on the waist of the occupant. By forming at the corresponding position, the side impact load from the shock absorber 56 of the outer panel 54 is reliably received by the portion of the shock absorbing member 52 protruding to the outer panel 54 side at the time of the side collision, and the shock absorbing member 52 The vehicle enters the indoor side 55 and presses the occupant's waist toward the vehicle interior with the impact absorbing member 52 so as to ensure an occupant protection effect against a side collision.
Japanese Patent Laid-Open No. 2001-239834

  However, in the conventional automobile door shown in Patent Document 1, the impact absorbing member 52 including the plurality of collision absorbing ribs 51 formed on the panel member 53 protrudes from the panel member 53 and the impact absorbing member. Since the configuration of 52 is complicated, there is a problem that it is difficult to integrally mold the panel member 53.

 Further, it is necessary to set the rigidity of the panel member 53 high so that the panel member 53 on which the shock absorbing member 52 is formed does not break before the impact absorbing member 52 breaks at the time of a side collision. There is a problem that the weight of the member 53 is increased and the cost of the molding material is increased.

 For this reason, it is conceivable that the panel member has a simple configuration without attaching the shock absorbing member to the panel member, and the panel member is provided with a thin broken portion such as a notch. There is a problem that the panel member is not easily cracked because of strong impact force, and the notch is too deep and the surface rigidity of the panel member is lowered.

 In addition, when intermittent slits are used instead of notches, the surface rigidity of the panel members may be reduced, and additional steps are required because it is necessary to attach a seal pad to prevent water leakage and outside air entry. There was a problem that led to cost increase.

 Accordingly, an object of the present invention is to easily obtain an inexpensive panel member while reducing the weight by simplifying the panel member without attaching the shock absorbing member to the panel member.

  And it aims at improving a passenger | crew protection performance because a side collision protection device operates reliably by a panel member being easily fractured at the time of a side collision.

The invention according to claim 1 is an automobile door in which a panel member is provided between a door inner panel and a door trim so as to close an opening provided in the door inner panel, and the door outer panel and the door trim While a shock absorber as a side collision protection device is provided opposite to the opposite side surface, a panel fracture portion is formed in a portion corresponding to the shock absorber of the panel member, and the panel member is a shock of the door outer panel. A shock absorber receiving portion that is larger than the projected side surface of the absorber, an annular groove that surrounds the shock absorber receiving portion, and a plate portion that forms an outer periphery of the annular groove, and the panel breakage portion includes the shock absorbing portion. Including a body receiving part and an annular groove part,
The shock absorbing body receiving portion and at least the groove periphery of the plate portion that is continuous with the shock absorbing body receiving portion are formed of a thin surface skin layer made of a dense fiber-containing resin and an internal expansion layer made of a sparse fiber-containing resin. The bottom of the annular groove is a thick layer made of a dense fiber-containing resin, and the shock absorber receiving portion, the annular groove, and the plate portion are flush with the surface facing the door outer panel. In the shock absorber receiving portion and the plate portion, the inner expansion layer at the peripheral edge of the groove is integrally formed so as to be thicker than the thick layer at the bottom of the annular groove. Yes.

  According to this automobile door, since the shock absorber receiving portion formed on the panel member does not protrude on both sides of the panel member, the panel member can be simplified, and a lightweight and inexpensive integrally formed panel member can be easily obtained. .

  And in the case of a side collision, the surface skin layer of a panel fracture | rupture part can be easily fractured | ruptured along the thick layer as a bottom part of a groove part.

  As a result, the shock absorber provided on the door outer panel and the shock absorber provided on the door trim can collide with each other via the broken shock absorber receiving portion to effectively absorb the shock.

  Invention of Claim 2 is the door for motor vehicles of Claim 1, Comprising: The thickness of the thick layer of the said groove part is about 2 to 3 times the thickness of the internal expansion layer of the said center part. It is a feature.

  According to this automobile door, the surface skin layer of the panel breakage portion can be easily and reliably broken along the thick layer as the bottom of the groove portion in the case of a side collision.

    According to the first aspect of the present invention, the panel member can be simplified to facilitate integral molding. In the case of a side collision, the surface skin layer of the panel fracture portion can be easily broken along the thick layer as the bottom of the groove. Therefore, the occupant protection effect against a side collision can be obtained with certainty by pressing the occupant's waist toward the passenger compartment by the shock absorbers facing both sides of the panel member.

  According to the second aspect of the present invention, the surface skin layer of the panel breakage portion can be easily and reliably broken along the thick layer as the bottom of the groove portion in the case of a side collision. Therefore, the occupant protection effect against a side collision can be reliably obtained by pressing the occupant's lower back portion toward the vehicle interior by the shock absorber.

<Configuration of Embodiment of the Present Invention>
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, an automobile door 1 according to an embodiment of the present invention (this figure shows a door on the right seat side of the front of the automobile) faces a door outer panel 2 facing the outside of the vehicle and the inside of the vehicle. The door inner panel 24 and the door trim 3 that covers the side surface of the door inner panel 24 on the passenger compartment side are provided, and the panel member 4 is bonded with an adhesive N so as to close the opening 25 provided in the door inner panel 24. Glued.

 Further, shock absorbers 8 and 9 as side collision protection devices 7 are provided facing the respective side surfaces 5 and 6 of the outer panel 2 and the door trim 3 facing each other, while the panel member 4 has a shock absorber 8. , 9 is formed at a portion corresponding to 9. The panel member 4 is formed of a fiber-containing resin material, and the panel member 4 receives the shock absorber on a straight line PP connecting the center of the shock absorber 8 of the outer panel 2 and the shock absorber 9 of the door trim 3. Part 13 is formed.

  Further, the shock absorber receiving portion 13 of the panel member 4 is formed larger than the projection side surface 11 (substantially rectangular outer shape in this embodiment) of the shock absorber 8 of the door outer panel 2 facing the panel member 4. An annular groove portion 14 that surrounds the body receiving portion 13 and a plate portion 15 that forms the outer periphery of the annular groove portion 14 are formed. Therefore, the outer peripheral shape of the shock absorber 8 is provided on the inner side at a distance E (including zero) from the outer shape (projection side surface) of the shock absorber receiver 13.

  The panel breakage portion 10 includes the shock absorber receiving portion 13 and the annular groove portion 14, and the shock absorber receiving portion 13 and the plate portion 15 include an internal expansion layer 16 formed of a sparse fiber-containing resin. It is a structure covered with a thin surface skin layer 17 made of a dense fiber-containing resin.

  The bottom portion 18 of the annular groove portion 14 is a thick layer made of a dense fiber-containing resin, and the shock absorber receiving portion 13, the annular groove portion 14 and the plate portion 15 face the door outer panel 2. The surface 19 is formed so as to be flush with each other, and the thickness S of the inner expansion layer of the groove peripheral portion 20 in the shock absorber receiving portion 13 and the plate portion 15 is the thick layer of the bottom portion 18 of the annular groove 14. It is integrally formed so as to be thicker than the wall thickness T.

  Further, the plate portion 15 is partially formed around the panel breaking portion 10 without being formed over the entire panel member 4.

 Here, a door sash 26 is incorporated between the door outer panel 2 and the door inner panel 24 so that a wind glass 27 is attached. A metal material is used for the door outer panel 2, the door inner panel 24, and the door sash 26. Further, the door 1 for an automobile is attached to a vehicle body (not shown) so as to be opened and closed through a door hinge upper 28 and a door hinge lower 29 for opening and closing the door attached to the door inner panel 24.

 The door trim 3 is formed of a resin material, and an armrest 22 and a window opening / closing switch 21 are provided on the indoor side M.

   As shown in FIG. 3, the surface skin layer 17 of the shock absorber receiving portion 13 and the plate portion 15 has a thickness U and covers the inner expansion layer 16 over the entire outer periphery. The corner 18a on the outer panel side of the bottom 18 has an inclination of about 45 degrees toward the shock absorber receiving portion 13 as shown by a straight line QQ, and the surface skin layer 17 of the shock absorber receiving portion 13 and It is formed by uniting. The bottom portion 18 is formed of a dense fiber-containing resin equivalent to the surface skin layer 17 of the shock absorber receiving portion 13.

<Procedure for forming panel member 4>
This procedure will be described based on a mold for molding the periphery including the annular groove 14. As shown in FIG. 4A, in the initial state of the mold 30, the cavity mold 31 and the movable mold 32 are closed, and the cavity 33 is formed between them. Further, a slide die 36 is attached to the movable die 32 in a hole 38 provided in the movable die 32 so as to be relatively slidable. In FIG. And is flush.

  As shown in FIG. 4B, a molten thermoplastic resin 34 as a fiber-containing resin material is injected into a cavity 33 of a mold 30 from a nozzle (not shown) through a resin flow path. Thereafter, the injected molten thermoplastic resin 34 is gradually cooled from the contact portion with the mold 30.

  Before the molten thermoplastic resin 34 is completely cooled and cured, as shown in FIG. 4C, the movable mold 32 is moved in the direction of the arrow to the position G at which the final molded product becomes thick (plate thickness). Retreat (expand). Here, the slide mold 36 is not retracted, and the tip 39 is held at the position F as it is.

  By the retraction of the movable mold 32, the molten thermoplastic resin 34 expands due to a springback phenomenon due to the entanglement of the contained fibers. Then, it is pressed against the mold wall surface by this expansion force and becomes the shape of the final molded product.

  At this time, the slide mold 36 is molded in a state where it is held at a position separated from the cavity by the thickness of the bottom 18 of the annular groove 14 (the distance between the position F and the position H corresponds to the thickness T). Therefore, the annular groove portion 14 is formed in a portion corresponding to the slide mold 36. Then, after cooling, the mold is opened, and the integrally molded molded product of the fiber-containing resin panel member 4 is taken out.

 When the movable mold 32 is moved backward in the thickness direction of the cavity to expand the molten resin, an internal expansion layer 16 made of a sparse fiber-containing resin is formed by expansion at a high expansion portion that is an internal expansion layer of the molded product. However, since the surface of the molded product is cooled without change before the movable mold is retracted, a thin surface skin layer 17 made of a dense fiber-containing resin is formed.

 Here, when the movable mold 32 is moved backward in the thickness direction of the cavity 33 to expand the molten resin, the mold slide mold 36 does not move backward, so that the molten resin does not substantially expand. For this reason, the molten resin is cooled to form the bottom portion 18 of the annular groove portion 14 made of a dense fiber-containing resin.

 The corners 18a and 18b of the bottom 18 where the shock absorber receiving portion 13 and the surface skin layer 17 of the plate portion 15 and the bottom 18 of the annular groove 14 abut are explained with reference to FIG. As described above, the resin thickness of the corner 18a of the bottom 18 has an inclination of 45 degrees (straight line QQ) from the corners 18a and 18b toward the shock absorber receiver 13 so that the shock absorber receiver 13 It is formed by uniting with the surface skin layer 17.

 The panel member 4 on the outer periphery (outer side) of the plate portion 15 is not formed with the internal expansion layer 16 like the shock absorber receiving portion 13 and the plate portion 15, and the panel fracture portion is made of a dense fiber-containing resin. 10 and the plate part 15 are formed integrally.

  As a result of the experiment, when the thickness of the inner expansion layer 16 of the shock absorber receiving portion 13 is in the range of about 2 to 3 times the thickness of the bottom portion 18 of the annular groove portion 14, the panel breaking portion 10 is easily broken. I understood it. Further, when the thickness of the bottom 18 of the annular groove 14 is 1.3 mm to 1.8 mm, the panel breakable portion 10 is easily broken in the range of the thickness 0.2 mm to 0.5 mm of the surface skin layer 17. It was.

<Operation of automobile doors>
As shown in FIGS. 5 and 6, the shock absorber 9 on the door trim side is formed at a position corresponding to the waist of the occupant seated on a seat (not shown), and is provided on the outer panel 2 shown in FIG. The shock absorber 8 moves in the direction of the arrow due to the side impact load and hits the shock absorber receiver 13.

 At this time, the cross section along the straight line QQ shown in FIG. 3 of the panel fracture portion 10 is a boundary surface where the sparse fiber-containing resin and the dense fiber-containing resin are adjacent to each other. For this reason, since this boundary surface is a tomographic surface having a discontinuous impact strength, stress concentration is likely to occur when an impact load is applied, and shearing force tends to work along the boundary surface to cause cracking.

 Here, the shock absorber receiving portion 13 and the plate portion 15 have a structure in which the internal expansion layer 16 made of a sparse fiber-containing resin is covered with a thin surface skin layer 17 made of a dense fiber-containing resin. The skin portion 17 of the K portion along -Q is thinner than the thickness of the bottom portion 18 of the annular groove portion 14. Therefore, when the shock absorber 8 further moves in the direction of the arrow, the skin layer 17 at the K portion of the shock absorber receiving portion 13 is broken along the straight line QQ.

 The broken shock absorber receiving portion 13 abuts against the shock absorber 9 on the door trim 3 side by the shock absorber 8 to further move the shock absorber 9 in the direction of the arrow.

  The shock absorbers 8 and 9 are displaced toward the occupant's lumbar region and immediately press the occupant's lumbar region seated on the seat toward the interior of the vehicle. It can be well protected.

Thus, compared with providing a thin easily breakable part such as a notch or a slit in the panel member, it is possible to suppress a reduction in surface rigidity of the panel member. And, in the case of a side collision, the surface skin layer of the panel breakage portion can be easily broken along the thick layer as the bottom of the groove portion. The present invention is limited only to the configuration of the above-described embodiment. Is not to be done.

 For example, the surface shape of the panel fracture portion 10 may be a circle or an ellipse other than a substantially rectangular shape.

It is a disassembled perspective view which shows the door for motor vehicles in embodiment of this invention. It is AA sectional drawing in FIG. 1 of the door for motor vehicles in embodiment of this invention. FIG. 3 is a detailed view of part B in FIG. 2. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the formation process of the panel fracture | rupture part of the door for motor vehicles in embodiment of this invention, (a) is sectional drawing of a mold closed state with an empty cavity, (b) injected the fiber containing resin material into the cavity. Sectional drawing of a state, (c) is sectional drawing of the state which the fiber containing resin material expanded to the position which separated the movable mold | die from the cavity. It is sectional drawing just before the fracture | rupture of a panel fracture | rupture part of the door for motor vehicles in embodiment of this invention. It is sectional drawing after the fracture | rupture of the panel fracture | rupture part of the door for motor vehicles in embodiment of this invention. It is sectional drawing of the door for motor vehicles of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automotive door 2 Outer panel 3 Door trim 4 Panel member 5 Side face 6 Side face 7 Side collision protective device 8 Shock absorber 9 Shock absorber 10 Panel fracture | rupture part 11 Outer periphery shape 13 Shock absorber receiving part 14 Annular groove part 15 Plate part 16 Internal expansion Layer 17 Surface skin layer 18 Bottom 19 Surface 24 Inner panel 25 Opening N Adhesive S Thickness T Thickness PP Straight line

Claims (2)

A door for a vehicle in which a panel member is provided between a door inner panel and a door trim so as to close an opening provided in the door inner panel,
While a shock absorber as a side collision protection device is provided opposite to the opposite side surface of the door outer panel and the door trim, a panel breakage portion is formed in a portion corresponding to the shock absorber of the panel member,
The panel member includes a shock absorber receiving portion larger than a projection side surface of the shock absorber of the door outer panel, an annular groove portion surrounding the shock absorber receiving portion, and a plate portion forming an outer periphery of the annular groove portion. ,
The panel break portion includes the shock absorber receiving portion and an annular groove portion,
The shock absorbing body receiving portion and at least the groove periphery of the plate portion that is continuous with the shock absorbing body receiving portion are formed of a thin surface skin layer made of a dense fiber-containing resin and an internal expansion layer made of a sparse fiber-containing resin. The bottom of the annular groove is a thick layer made of a dense fiber-containing resin,
The shock absorber receiving portion, the annular groove portion, and the plate portion are formed so that the surfaces facing the door outer panel are flush with each other, and the shock absorber receiving portion and the plate portion have an inner expansion layer at a peripheral portion of the groove portion. A door for an automobile, wherein the door is integrally formed so as to be thicker than a thick layer at the bottom of the annular groove.   2. The automobile door according to claim 1, wherein the thickness of the inner expansion layer of the shock absorber receiving portion is approximately 2 to 3 times the thickness of the thick layer of the groove portion. Door.

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