JP4401274B2 - Car back door - Google Patents

Description

The present invention relates to an improvement in a back door of an automobile, and more particularly, to a measure for preventing a radio wave transmitted from a radio wave transmitter mounted in the automobile from erroneously detecting a person or an animal outside the vehicle.

  As a vehicle body structure, an antenna provided on the rear window glass by covering the harness wired between the rear parcel panel behind the rear seat and the parcel trim with a protector and blocking the electromagnetic waves generated from the harness with the protector. A vehicle body structure has been developed in which the above-described electromagnetic waves do not adversely affect the reception sensitivity (see, for example, Patent Document 1).

By the way, recently, in a car, while the driver is locked away from the car, damages such as car theft and roughing on the car are undeniable. For this reason, if a radio wave transmitter is installed in a car and a suspicious person enters the vehicle and blocks the radio wave transmitted from the radio wave transmitter, for example, an alarm is activated to generate an alarm sound. Anti-theft measures are made to inform people around you.
JP-A-10-45036 (page 3, FIG. 3)

  However, when the vehicle body is made of resin, the radio waves transmitted from the radio wave transmitter easily pass through the vehicle body, and if a radio wave emitted outside the vehicle is blocked by a person or animal outside the vehicle, a device such as an alarm will be detected. It will malfunction.

  The present invention has been made in view of this point, and an object of the present invention is to prevent radio waves passing through the vehicle body from erroneously detecting people or animals outside the vehicle.

  In order to achieve the above object, the present invention prevents a radio wave transmitted from a radio wave transmitter mounted on an automobile from passing through a vehicle body from erroneously detecting a person or an animal outside the vehicle. In addition, the interior space between the inner panel and the outer panel is effectively used.

Specifically, the present invention includes an inner panel and an outer panel coupled to the inner panel so that an internal space is formed between the inner panel, and the outer panel includes a license plate housing portion. The following solution was taken for the back door of an automobile formed by recessing inside the vehicle body so as to approach the inner panel .

That is, according to the first aspect of the present invention, the inner panel and the outer panel are formed of a resin material, the internal space has an opening corresponding to the license plate housing portion, and is a sound absorbing material. mat formed by wear with the conductive sheet material on the side surface is arranged on the license plate accommodating outsiders around like fit the license plate housing portion in the opening, on the back side of the license plate accommodating section, The cover is disposed so as to have an inner panel and an inner space, and a mat formed by attaching a conductive sheet material to one side surface of the base material, which is a sound absorbing material, is provided on the inner surface of the cover. It is characterized by being bonded so as to cover the opening of the mat .

The invention according to claim 2 is the invention according to claim 1, wherein the sheet material is an aluminum foil .

The invention described in 請 Motomeko 3 is the invention according to claim 1, between the outer panel and the inner panel in the vehicle width direction on both sides of the license plate housing portion internal space is formed, the license plate housing portion The inner wall of the inner panel corresponding to the inner space on both sides in the vehicle width is integrally protruded so that the column is close to the outer panel, and a sound-absorbing mat is sandwiched between the tip of the column and the outer panel, and the license plate The mat around the housing portion is located on the inner panel side with respect to the sound absorbing mat and partially overlaps with the sound absorbing mat, and the support column penetrates the mat around the license plate housing portion. To do.

  According to the first aspect of the present invention, even if a radio wave transmitted into the vehicle passes through the vehicle body, the phase of the radio wave changes to a range in which no object is detected, thereby preventing erroneous detection of people or animals outside the vehicle. can do. Therefore, a device such as an alarm device does not malfunction.

Further, a mat having both a function of preventing erroneous detection by radio waves and a sound absorbing function can be obtained.

Furthermore, the function of preventing erroneous detection by radio waves or both the sound absorbing function and the sound absorbing function can be exhibited over a wide range on the back surface side of the license plate housing portion and its periphery.

  According to the invention which concerns on Claim 2, since aluminum foil is light and thin, it can be easily installed also in a narrow space. Since the aluminum foil is inexpensive, the cost of the vehicle body structure can be reduced.

According to the invention of claim 3 , the strut prevents the outer panel from being depressed by an external force, and the sound absorbing mat is held between the tip of the strut and the outer panel, so that the sound absorbing mat is effectively held. Can do.

  Further, since the operator can manually hold the support column protruding from the inner panel, the inner panel can be easily transported and assembled.

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

(Embodiment 1)
FIG. 3 shows a back door 1 according to Embodiment 1 of the present invention, and this back door 1 constitutes a part of a vehicle body of an automobile. The back door 1, the inner panel 3 comprises an outer panel 5 coupled to the outside of the inner panel 3, these inner panels 3 and the outer panel 5 are made of a resin material.

A substantially rectangular opening 11 is formed in the outer panel 5, and a window glass 13 is attached to the opening 11. In the vehicle width direction central portion of the outer panel 5, a substantially rectangular license plate housing portion 15 is formed with recessed inside the vehicle body so as to approach the inner panel 3 (see FIG. 1). 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. 3, reference numeral 17 denotes a hinge mounting portion that pivotally supports the back door 1 so that it can be opened downward to the upper edge (not shown) of the opening at the rear of the vehicle body.

An inner space 19a (19) is formed between the inner panel 3 and the outer panel 5 as shown in FIG. The internal space 19a (19), the mat 21 having an opening corresponding to the license plate accommodating section 15, to the license plate housing portion 15 outside around like fit over Symbol license plate accommodating section 15 in the opening Is arranged. As shown in an enlarged view in FIG. 2A, the mat 21 is formed by attaching a conductive sheet material 23 to one side surface of the base material 25. When the electric wave transmitted from the electric wave transmitter (not shown) mounted in the vehicle passes through the outside of the vehicle, the conductive sheet material 23 has the electric wave transmitted from the electric 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. In other words, the conductive sheet material 23 is detected by the radio wave detection sensor when the in-vehicle radio wave transmitted from the radio wave transmitter is blocked by a person's intrusion into the car. Even if it is blocked by the radio wave, the radio wave detection sensor can change the phase of the radio wave so that it is not detected. The conductive sheet material 23 is an aluminum foil, a copper foil or the like, but it is desirable to use an aluminum foil that is lightweight and easy to install in a narrow space. As the base material 25, it is desirable to use a sound absorbing material such as urethane foam, a porous mat, or felt. The base material 25 also serves to hold the conductive sheet material 23 because the conductive sheet material 23 is thin and unstable. The mat 21 thus configured has an inner panel reinforcing rib or the like (not shown) formed on the inner panel 3 with the conductive sheet 23 facing the outer panel 5 and the base 25 facing the inner panel 3. Z). Although the mat 21 is set in such a direction, the reverse may be possible. The outer panel 5 and the inner panel 3 are joined together at their outer edges by an adhesive 26.

Further, a cover 27 is disposed on the back side of the license plate housing 15 so as to have an inner panel 3 and an internal space 29. The cover 27 lower end is fitted into a slit 3a that extends in the vehicle width direction is formed in-Napa panel 3, the upper end is removably attached to the inner panel 3. A plurality of the slits 3a are formed. This cover 27 is also formed of a resin material. Also, in the internal space 29, a mat 31 configured in the same manner as the mat 21 is disposed by being bonded to the inner surface of the cover 27 so as to cover the opening of the mat 21 around the license plate housing portion 15. 2B, the mat 31 is joined to the cover 27 by heat welding with the base material 25 facing the inner panel 3 side and the conductive sheet material 23 facing the cover 27 side. Is retained. The reason why the conductive sheet material 23 is positioned on the cover 27 side is to facilitate the welding of the conductive sheet material 23 and the cover 27 during the thermal welding. The orientation may be the same as that of the mat 21. In FIG. 1, 31a is a welding mark.

  Therefore, in the first embodiment, the mat 21 formed by attaching the conductive sheet material 23 to one side surface of the base material 25 is installed on the back surface side of the license plate housing portion 15 of the back door 1 and its periphery. Therefore, even if radio waves transmitted inside the vehicle pass through the vehicle body, the phase of the radio waves changes to a range where objects are not detected by the radio wave detection sensor, so that there is no false detection of people or animals outside the vehicle, and alarm It is possible to prevent malfunction of equipment such as a vessel.

  In addition, since the sound absorbing material is used as the base material 25, it is possible to exhibit both the function of preventing erroneous detection by radio waves and the sound absorbing function.

  Further, if a light and thin aluminum foil is used as the conductive sheet material 23, installation work in a narrow space can be easily performed, and an inexpensive vehicle body structure can be obtained.

(Embodiment 2)
FIG. 7 shows a back door 1 according to the second embodiment. In the second embodiment, the sound absorbing mats 33 are arranged on both sides of the license plate accommodating portion 15 in the vehicle width direction, and are configured in the same manner as in the first embodiment. The same reference numerals are attached and detailed description thereof is omitted, and only the differences will be described below.

  That is, as shown in FIG. 4, an internal space 19 b is formed between the outer panel 5 and the inner panel 3 on both sides in the vehicle width direction of the license plate housing portion 15. The internal space 19b communicates with the internal space 19a of the first embodiment to constitute one internal space 19.

  On the inner surface of the inner panel 3 corresponding to the internal space 19b, two support columns 35 are integrally projected so as to be close to the outer panel 5. The two struts 35 are cylindrical and project from each other with a gap in the vertical direction and slightly shifted positions in the vehicle width direction.

  The sound-absorbing mat 33 has a substantially octagonal polygonal shape in plan view, and is disposed in the inner space 19b between the inner panel 3 and the outer panel 5 on both sides of the license plate housing 15 in the vehicle width direction. Is sandwiched between. On the inner panel 3 side of the sound absorbing mat 33, a mat 21 surrounding the license plate accommodating portion 15 is located. The mat 21 is partially overlapped with the sound absorbing mat 33 (substantially half of the region), and both sides in the vehicle width direction. The support column 35 is supported by the support column 35 by inserting the support column 35 through the insertion hole 21a formed in the insertion hole 21a. The sound-absorbing mat 33 is composed of a single sound-absorbing material as shown in an enlarged view in FIG. 5B, and has a different structure from the mat 21 having the two-layer structure shown in FIG. As the material, foamed urethane having a sound absorbing effect, porous mat or felt, cinsallate (manufactured by Sumitomo 3M Limited, trade name) and the like are suitable. The support 35 may simply pass through the insertion hole 21a of the mat 21 in a loosely fitted state without supporting the mat 21. In this case, the portion of the mat 21 located in the internal space 19b can be supported by a reinforcing rib or the like formed on the inner panel 3.

  Further, a welded portion 37 is provided on the back surface of the outer panel 5 so as to approach the two upper and lower columns 35. As shown in an enlarged view in FIG. 6, these welded portions 37 are formed of a rib group including a plurality of welding ribs 37 a that protrude in close proximity to each other. The welding procedure is as follows. The sound absorbing mat 33 is applied to the welding rib 37a of the welded portion 37, and the portion of the sound absorbing mat 33 in contact with the welding rib 37a is pressed by the welding machine, whereby the welding mat 33 is applied to the outer panel 5. Weld. In FIG. 4, 33a is the welding mark.

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

  In addition, in the second embodiment, the mat 21 surrounding the license plate accommodating portion 15 and the sound absorbing mat 33 are partially overlapped and held together by the support column 35, so that both are held separately. Compared to the case, the number of support columns 35 can be halved, and the number of welded portions 37 for heat-welding the sound-absorbing mat 33 to the outer panel 5 can be reduced. Furthermore, since the support column 35 holds the sound absorbing mat 33 against the outer panel 5 side, the outer panel 5 can be prevented from being dented by an external force. The support 35 prevents the outer panel 5 from being depressed due to an external force, and the sound absorbing mat 33 is sandwiched between the tip of the support 35 and the outer panel 5, so that the sound absorbing mat 33 can be effectively held. Further, since the plurality of welding ribs 37a are welded at a dense group of ribs (welding portion 37), the outer panel 5 corresponding to each welding rib 37a can be made inconspicuous due to thermal shrinkage, and the outer panel 5 It is possible to prevent the appearance from being deteriorated without leaving any welding marks on the front side.

Further, since the operator can manually hold the support column protruding from the inner panel 3, the inner panel 3 can be easily transported and assembled .

The present invention is useful for a back door of an automobile in which radio waves transmitted from the radio wave transmitter mounted on the automobile do not erroneously detect people or animals outside the vehicle.

It is sectional drawing in the AA of FIG. (A) is the elements on larger scale of the mat | matte arrange | positioned in the internal space between an outer panel and an inner panel in Embodiment 1, (b) is the internal space between an inner panel and a cover in Embodiment 1. FIG. It is the elements on larger scale of the mat | matte arrange | positioned in. 2 is a perspective view of a back door according to Embodiment 1. FIG. It is sectional drawing in the BB line of FIG. (A) is the elements on larger scale of the mat | matte hold | maintained at the support | pillar of the inner panel in Embodiment 2, (b) is the sound absorption mat clamped between the outer panel and the support | pillar of the inner panel in Embodiment 2. FIG. It is a partial enlarged view. FIG. 10 is an enlarged view of a welded portion in the second embodiment. 6 is a perspective view of a back door according to Embodiment 2. FIG.

DESCRIPTION OF SYMBOLS 1 Back door 3 Inner panel 5 Outer panel 15 License plate accommodating part 19, 19a, 19b, 29 Internal space 21, 31 Mat
23 conductive sheet material
25 base materials
27 Cover 33 Sound absorbing mat

Claims (3)

An inner panel , and an outer panel coupled to the inner panel so that an internal space is formed between the inner panel,
The outer panel is a back door of an automobile formed by being recessed in the vehicle body so that a license plate housing portion approaches the inner panel ,
The inner panel and outer panel are molded of a resin material,
The aforementioned internal space has an opening corresponding to the license plate accommodating section, the mat formed by wear with the conductive sheet material on one side of the base material is a sound absorbing material, the license plate housed in the opening Arranged around the license plate housing portion so as to accommodate the portion ,
On the back side of the license plate housing part, a cover is arranged to have an inner panel and an internal space,
A mat formed by adhering a conductive sheet material to one side surface of a base material that is a sound absorbing material is adhered to the inner surface of the cover so as to cover the opening of the mat around the license plate housing portion. Features a car backdoor . In the back door of the motor vehicle according to claim 1,
A back door of an automobile, wherein the sheet material is aluminum foil. In the back door of the motor vehicle according to claim 1 ,
An internal space is formed between the outer panel and the inner panel on both sides in the vehicle width direction of the license plate housing portion,
On the inner panel inner surface corresponding to the internal space on both sides in the vehicle width direction of the license plate housing portion , a support column is integrally projected so as to be close to the outer panel,
A sound-absorbing mat is sandwiched between the tip of the column and the outer panel,
The mat around the license plate housing portion is positioned on the inner panel side with respect to the sound absorbing mat and partially overlaps with the sound absorbing mat, and the support column penetrates the mat around the license plate housing portion. A car back door characterized by

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