JP2006131040A - Vehicle back door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain cost reduction and easy installation of a back door as well as high ease in conveyance and assembly of an inner panel and improvement in the rigidity of the back door, in a structure of a sound absorbing mat disposed in an internal space between the inner panel and an outer panel. <P>SOLUTION: On both sides of a license plate storage section 15 in the cross direction on an inner surface of the inner panel 3, a column 21 is integrally protruded so as to approach the back face of the outer panel 5. The sound absorbing mat 23 is sandwiched between the front end of the column 21 and the outer panel 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in a back door of an automobile in which noise absorption measures are taken.

Patent Document 1 discloses an automobile door in which a sound-absorbing mat is fixed to an inner panel by using an adhesive and a clip in an inner space formed between an inner panel and an outer panel.
JP-A-6-40296 (page 4, FIG. 5)

  However, in Patent Document 1, an adhesive and a clip are required to arrange the sound-absorbing mat in the internal space between the inner panel and the outer panel, which increases the cost and makes the assembly process complicated. Moreover, in patent document 1, since there is no means to support an outer panel from the internal space side, there exists a problem that an outer panel will dent when external force acts on an outer panel. Furthermore, when the inner panel is a single large panel, it becomes difficult to handle.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce the cost and assembly of the door in relation to the sound-absorbing mat disposed in the inner space between the inner panel and the outer panel. This is to improve the performance in handling the inner panel and the rigidity of the door.

  In order to achieve the above object, the present invention is characterized in that a structure for holding a sound absorbing mat is devised in an internal space between an inner panel and an outer panel of a back door of an automobile.

Specifically, in the present invention, the following solution is taken for a back door of an automobile in which an inner panel and an outer panel are joined so as to have an internal space.

  That is, according to the first aspect of the present invention, at least the inner panel of the inner panel and the outer panel is formed of a resin material, and the license plate is housed in a substantially central portion in the vehicle width direction of the outer panel. Are formed on both sides of the license plate housing portion on the inner surface corresponding to the inner space of the inner panel in the vehicle width direction so as to be close to the rear surface of the outer panel. A sound absorbing mat is sandwiched between the two.

  According to a second aspect of the present invention, in the first aspect of the invention, a rib group in which a plurality of welding ribs protrude from each other is formed on the back surface of the outer panel, and the sound absorbing mat includes the rib group. It is characterized by being thermally welded to the welded part as a welded part.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the outer panel is also formed of a resin material, and a radio wave transmitted from the radio wave transmitter mounted on the automobile to the inside of the interior space. A first mat in which a conductive sheet material that changes the phase of the substrate is attached to one side surface of the base material is disposed so as to surround the license plate housing portion, and on the back side of the license plate housing portion, a cover is disposed on the inner panel. Arranged to have an internal space, in the internal space between the cover and the inner panel, a second mat in which the conductive sheet material is attached to one side surface of the base material is disposed, and the sound absorbing mat is It is located on the outer panel side with respect to the first mat and partially overlaps with the first mat, and the support column penetrates the first mat.

  According to the first aspect of the present invention, since the sound absorbing mat has a soundproofing effect, and the sound absorbing mat is sandwiched between the outer end panel and the column end projecting integrally with the inner panel, the sound absorbing mat is attached to the inner panel. There is no need for adhesives or clips to hold in the internal space between the outer panel and the outer panel, which can reduce the cost and simplify the assembly process. There is no generation of frictional noise due to contact, and further, the outer panel can be supported from the inner space by the support column, so that the outer panel can be prevented from being dented by external force, and the rigidity of the back door can be increased. Further, the operator can easily carry the inner panel and perform assembly work by manually holding the support column protruding from the inner panel.

  According to the invention of claim 2, since the sound absorbing mat is thermally welded at a rib group (welding portion) composed of a plurality of welding ribs projecting from the rear surface of the outer panel, the thick welded portion having a large area is attached to the outer panel. Compared to the case where heat welding is performed, the area of the welded portion is divided into a plurality of welding ribs, and the welding area of each welding rib is reduced, and the outer panel surface side corresponding to each welding rib is heat shrunk It is possible to prevent the occurrence of sink marks due to the surface, and it is possible to improve the appearance of the appearance without leaving any welding marks on the outer panel surface side.

  According to the third aspect of the present invention, in the internal space between the inner panel and the outer panel, the first mat in which the conductive sheet material is attached to one side surface of the base material is disposed so as to surround the license plate housing portion. Since the second mat having the same configuration as the first mat is also arranged in the internal space between the cover on the back side of the license plate housing portion and the inner panel, the radio wave transmitter mounted on the automobile Even if the radio wave transmitted to the vehicle passes through the car body, the phase of the radio wave changes to a range where no object is detected, and it is possible to prevent false detection of people and animals outside the vehicle over a wide range of back doors. It is possible to prevent malfunctions of such devices.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 4 shows a back door 1 of an automobile according to Embodiment 1 of the present invention. The back door 1 includes an inner panel 3 and an outer panel 5 coupled to the outer side of the inner panel 3, and both the inner panel 3 and the outer panel 5 are formed of a resin material. When the sheet material is not provided, the outer panel may be made of metal. A substantially rectangular opening 11 is formed in the outer panel 5, and a window glass 13 is attached to the opening 11. A substantially rectangular license plate housing portion 15 is formed at the substantially central portion in the vehicle width direction of the outer panel 5 so as to be recessed toward the inner side of the vehicle body (the inner space 19a side described later). In addition, two mounting holes 15 a for attaching the license plate are formed in two places in the upper half of the license plate housing portion 15. In FIG. 4, reference numeral 17 denotes a hinge mounting portion that pivotally supports the back door 1 so as to be able to be opened downward to an upper end edge (not shown) of the opening at the rear of the vehicle body.

  As shown in FIG. 1, an internal space 19 a is formed between the inner panel 3 and the outer panel 5. Two struts 21 are integrally projected so as to be close to the rear surface of the outer panel 5 on both sides in the vehicle width direction of the license plate accommodating portion 15 on the inner surface corresponding to the inner space 19a of the inner panel 3. The two struts 21 are cylindrical and project from each other with a gap in the vertical direction and slightly shifted positions in the vehicle width direction (see FIG. 4).

  In the internal space 19a (19) between the inner panel 3 and the outer panel 5 on both sides of the license plate accommodating portion 15 in the vehicle width direction, as shown in FIG. It is sandwiched between the tip and the outer panel 5. These sound-absorbing mats 23 are substantially octagonal polygonal shapes in plan view, and are composed of a single sound-absorbing material as shown in an enlarged cross-sectional view in FIG. 2, and the material thereof is foamed urethane or porous material having a sound-absorbing effect. Matt, felt, cinsalate (trade name, manufactured by Sumitomo 3M Limited) and the like are suitable. Further, as shown in an enlarged view in FIG. 3, a rib group in which a plurality of welding ribs 33a protrudes in parallel with each other is formed on the back surface of the outer panel 5, and these rib groups are shown in FIG. Thus, it is located above the upper column 21 and below the lower column 21. The sound absorbing mat 23 is thermally welded to the welded portion 33 with the rib group as the welded portion 33. The welding procedure is as follows. The sound absorbing mat 23 is applied to the welding rib 33a of the welding portion 33, and the portion of the sound absorbing mat 23 that is in contact with the welding rib 33a is pressed by the welding machine, whereby the sound absorbing mat 23 is applied to the outer panel 5. Weld. In FIG. 1, reference numeral 23 a denotes a welding mark formed on the sound absorbing mat 23. Note that the outer panel 5 and the inner panel 3 are integrally joined to each other by an adhesive 35 at their outer edges.

  Therefore, in the first embodiment, the presence of the sound absorbing mat 23 can effectively achieve soundproofing. Further, since the sound absorbing mat 23 is sandwiched between the tip of the support column 21 projecting integrally with the inner panel 3 and the outer panel 5, an adhesive material and a clip as in Patent Document 1 are unnecessary, and the cost is reduced. The assembly process can be simplified, and the generation of frictional noise due to direct contact between the tip of the column 21 and the outer panel 5 can be prevented.

  Moreover, in this Embodiment 1, the rigidity can be improved so that the outer panel 5 may not be dented with external force by supporting the outer panel 5 from the internal space 19a side with the support | pillar 21. FIG.

  Further, in the first embodiment, the operator can easily handle the inner panel 3 by, for example, easily transporting or assembling the inner panel 3 because the operator holds the column 21 protruding from the inner panel 3 by hand. .

  In addition, in the first embodiment, the sound-absorbing mat 23 is thermally welded at a rib group (welded portion 33) composed of a plurality of welding ribs 33a protruding from the back surface of the outer panel 5, so that it is thick and has a large area. Compared with the case where the welded portion is provided on the outer panel 5 and thermally welded, the area of the welded portion 33 is divided into a plurality of welded ribs 33a, and the welded area of each welded rib 33a is reduced, so that each welded rib 33a is reduced. It is possible to prevent the occurrence of sink marks due to thermal contraction on the outer panel 5 surface side corresponding to the above, and it is possible to improve the appearance of the outer panel 5 without leaving any welding marks.

  Furthermore, since the sound absorbing mat 23 is pressed and supported by the support column 21, the number of welding locations by the welding portion 33 can be reduced, and as a result, the number of welding work steps by the welding machine can be reduced.

(Embodiment 2)
5 to 8 show the back door 1 according to the second embodiment. In the second embodiment, except that the first mat 29 and the second mat 31 are provided in addition to the sound absorbing mat 23, the second embodiment is configured in the same manner as in the first embodiment. A detailed description thereof will be omitted with reference numerals, and only differences will be described below. In FIG. 6, reference numeral 19b denotes an internal space formed between the inner panel 3 and the outer panel 5, and this internal space 19b communicates with the internal space 19a in FIG. Yes.

  That is, the first mat 29 is arranged in the internal space 19 (19a, 19b) so as to surround the license plate accommodating portion 15, as shown in FIGS. The first mat 29 is formed by attaching the conductive sheet material 25 to one side surface of the base material 27 as shown in an enlarged view in FIG. The conductive sheet material 25 is configured such that when a radio wave transmitted from a radio wave transmitter (not shown) mounted on an automobile passes through the outside of the vehicle, the phase of the radio wave transmitted through the radio wave transmitter is transmitted from the radio wave transmitter. This is for changing the phase so that the phase is different from the phase. The phase of the radio wave that passes outside the vehicle is set to a phase that cannot be detected by a radio wave detection sensor (not shown) mounted inside the vehicle. That is, the conductive sheet material 25 is detected by a radio wave detection sensor when a radio wave transmitted from a radio wave transmitter (not shown) is blocked by a person entering the vehicle or the like. Even if a radio wave that passes through is blocked outside the vehicle, the radio wave detection sensor can change the phase of the radio wave so that it does not detect it. The conductive sheet material 25 is an aluminum foil, a copper foil, or the like, but it is desirable to use an aluminum foil that is lightweight, inexpensive, and easy to install in a narrow space. As the base material 27, it is desirable to use a sound absorbing material such as urethane foam, a porous mat, or felt. The base material 27 also plays a role of holding the conductive sheet material 25 because the conductive sheet material 25 is thin and unstable. The first mat 29 configured as described above includes the first mat 29 in which the column 21 formed on the inner panel 3 with the conductive sheet material 25 facing the outer panel 5 side and the base material 27 facing the inner panel 3 side. It is supported by penetrating through the insertion hole 29a. Although the first mat 29 is set in such a direction, it may be reversed. Further, the support column 21 may simply pass through the insertion hole 29a of the first mat 29 in a loosely fitted state without supporting the first mat 29. In this case, the first mat 29 is supported by a reinforcing rib (not shown) formed on the inner surface corresponding to the inner space 19 of the inner panel 3. In addition to supporting the first mat 29 with the support column 21 as in the above embodiment, the first mat 29 may be further supported with the reinforcing rib.

  As shown in FIG. 6, a cover 37 is arranged on the back surface side of the license plate accommodating portion 15 of the outer panel 5 so as to have an inner panel 3 and an internal space 39, and the lower end of the cover 37 is formed on the inner panel 3. The plurality of slits 3a (only one appears in FIG. 6) extending in the vehicle width direction are fitted, and the upper end is detachably attached to the inner panel 3. This cover 37 is also formed of a resin material. Note that the cover 37 is omitted in the first embodiment.

  The second mat 31 is disposed in the internal space 39 between the cover 37 and the inner panel 3. As shown in the enlarged view of FIG. 7B, the second mat 31 is formed by attaching the conductive sheet material 25 to one side surface of the base material 27 in the same manner as the first mat 29. The base material 27 is directed to the 3 side, and the conductive sheet material 25 is directed to the cover 37 side. The reason why the conductive sheet material 25 of the second mat 31 is positioned on the cover 37 side is to facilitate welding of the conductive sheet material 25 and the cover 37. The second mat 31 is set in such a direction, but the reverse may be the same as the first mat 29. In FIG. 6, 31 a is a welding mark of the second mat 31.

  Further, the sound absorbing mats 23 arranged in the internal space 19a (19) on both sides in the vehicle width direction of the license plate accommodating portion 15 are positioned on the outer panel 5 side with respect to the first mat 29 as shown in FIG. One mat 29 is partially overlapped so that a substantially half region on the inner side in the vehicle width direction overlaps.

  Therefore, in the second embodiment, the same operational effects as in the first embodiment can be achieved.

  In addition, in the second embodiment, the first mat 29 in which the conductive sheet material 25 is attached to one side surface of the base material 27 is licensed in the internal space 19a (19) between the inner panel 3 and the outer panel 5. A second mat 31 having the same configuration as that of the first mat 29 is also arranged in the inner space 39 between the cover 37 and the inner panel 3 on the back side of the license plate accommodating portion 15. Therefore, even if radio waves transmitted from the radio wave transmitter installed in the car pass through the car body, the phase of the radio wave changes to a range where no humans or animals are detected, so that the outside of the back door 1 is wide. Thus, it is possible to prevent malfunctions of devices such as alarm devices. If a light and thin aluminum foil is used as the conductive sheet material 25, installation work in a narrow space can be easily performed, and an inexpensive back door can be obtained.

  Further, in the second embodiment, the first mat 29 surrounding the license plate housing portion 15 and the sound absorbing mat 23 are partially overlapped and held together by the support column 21, so that both are held separately. Compared with the case where it does, while the number of the support | pillars 21 can be reduced, the number of the welding parts 33 which heat-seal the sound absorption mat 23 to the outer panel 5 can be reduced.

  The present invention is useful for a back door of an automobile with a sound absorption measure.

It is sectional drawing in the AA of FIG. It is the elements on larger scale of a sound absorption mat. It is an enlarged view of a welding part (rib group). 2 is a perspective view of a back door according to Embodiment 1. FIG. It is sectional drawing in the BB line of FIG. It is sectional drawing in CC line of FIG. (A) is the elements on larger scale of the 1st mat, (b) is the elements on larger scale of the 2nd mat. 6 is a perspective view of a back door according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back door 3 Inner panel 5 Outer panel 15 License plate accommodating part 19,19a, 19b, 39 Internal space 21 Support | pillar 23 Sound absorption mat 25 Conductive sheet material 27 Base material 29 1st mat 31 2nd mat 33 Welding part (rib group)
33a Welding rib 37 Cover

Claims (3)

A back door of an automobile in which an inner panel and an outer panel are joined so as to have an internal space,
Of the inner panel and the outer panel, at least the inner panel is formed of a resin material,
A license plate accommodating portion that is recessed toward the inner space is formed at a substantially central portion in the vehicle width direction of the outer panel,
On both sides in the vehicle width direction of the license plate housing portion on the inner surface corresponding to the inner space of the inner panel, a support column is integrally projected so as to be close to the rear surface of the outer panel,
A back door of an automobile, wherein a sound absorbing mat is sandwiched between the tip of the column and the outer panel. In the back door of the motor vehicle according to claim 1,
On the back surface of the outer panel, a rib group is formed in which a plurality of welding ribs are projected close to each other,
The back door of an automobile, wherein the sound absorbing mat is thermally welded to the welded portion using the rib group as a welded portion. In the back door of the automobile according to claim 1 or 2,
The outer panel is also molded from a resin material,
In the internal space, a first mat in which a conductive sheet material that changes the phase of a radio wave transmitted from the radio wave transmitter mounted on the automobile is attached to one side surface of the base material surrounds the license plate housing portion. Arranged as
On the back side of the license plate housing part, a cover is arranged to have an inner panel and an internal space,
In the internal space between the cover and the inner panel, a second mat in which the conductive sheet material is attached to one side surface of the substrate is disposed,
A back door of an automobile, wherein the sound absorbing mat is positioned on the outer panel side with respect to the first mat and partially overlaps with the first mat, and the support column penetrates the first mat.

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