JP7373373B2 - vehicle back door - Google Patents

Description

The present invention relates to a vehicle back door.

Patent Document 1 discloses a back door for an automobile in which an inner panel and an outer panel are combined so as to have an internal space. The back door of Patent Document 1 includes a sound-absorbing mat sandwiched between the outer panel and the tip of a support column that is integrally provided on the inner surface corresponding to the internal space of the inner panel. According to this, the sound that attempts to enter the vehicle interior from outside the vehicle is absorbed.

Patent No. 4284266

Incidentally, sounds and vibrations generated by the vehicle may cause resonance in the interior space of the back door, resulting in muffled sound. When this muffled sound is transmitted into the vehicle interior, there is a problem in that it becomes interior noise.

The present invention has been made in view of the above, and its purpose is to suppress the transmission of muffled sounds generated in the interior space of a vehicle back door into the vehicle interior.

In order to achieve the above object, the present invention forms a partition rib that separates a large space and a small space in the interior space of the back door, and forms a partition between the tip of the partition rib and the inner panel or the outer panel. A first soundproofing material was provided in the gap.

Specifically, the first invention is a vehicle back door formed by combining an inner panel and an outer panel so as to have an internal space, the internal space having a relatively large length in the longitudinal direction of the vehicle. It has a large space and a small space that is provided adjacent to the large space and has a relatively small length in the longitudinal direction of the vehicle, and faces the internal space in one of the inner panel and the outer panel. A partition rib is formed on the inner surface to separate the large space and the small space, and a gap is formed between the tip of the partition rib and the other of the inner panel and the outer panel. A first soundproofing material is sandwiched in the gap.

A second invention is characterized in that in the first invention, the first soundproofing material is made of a closed cell foam.

A third invention is characterized in that, in the first invention, the first soundproofing material is made of an adhesive.

In a fourth invention, in any one of the first to third inventions, a second soundproofing material is provided on a surface facing the small space of at least one of the inner panel, the outer panel, and the partition rib. It is characterized by being

According to the first invention, a partition rib is formed on the inner surface of one of the inner panel and the outer panel facing the internal space, and the partition rib separating the large space and the small space is formed, and the tip of the partition rib and the inner panel A gap is formed between the first soundproofing member and the other outer panel, and the first soundproofing material is sandwiched in this gap. Therefore, the first soundproofing material can suppress the muffled sound generated in the large space from permeating into the small space where the sound attenuation effect of air is lower than that of the large space. It is possible to suppress the muffled sound generated in the interior space of the door from penetrating into the vehicle interior.

According to the second invention, since the first soundproofing material is made of a closed cell foam having sound insulation performance, it further suppresses muffled sounds generated in a large space from permeating into a small space. be able to.

Further, since the closed cell foam also has a buffering performance, it is possible to suppress denting of the outer panel due to external force, and it is possible to improve the appearance of the outer panel.

According to the third invention, since the first soundproofing material is made of an adhesive, the partition rib can be reliably fixed to the other of the inner panel and the outer panel by the adhesive, and the partition rib can be fixed to the other of the inner panel and the outer panel. It can be used as a pillar to support from the internal space. Therefore, the rigidity of the vehicle back door can be improved.

According to the fourth invention, the second soundproofing material is provided on the surface of at least one of the inner panel, the outer panel, and the bulkhead rib that faces the small space, so that the second soundproofing material allows sound to be heard outside the vehicle. It is possible to suppress the generated external sound from passing into the vehicle interior through the small space where the damping effect of air is relatively low.

1 is an exploded perspective view of a vehicle back door according to Embodiment 1. FIG. FIG. 3 is a front view of the inner panel viewed from the rear side of the vehicle. FIG. 3 is a sectional view taken along line III-III in FIG. 2; 4 is an enlarged view of region IV surrounded by the dashed line in FIG. 3. FIG. FIG. 4 is an enlarged view of a region V surrounded by a dashed line in FIG. 3. FIG. FIG. 6 is a view corresponding to FIG. 5 showing the first soundproofing material according to Embodiment 2;

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of preferred embodiments is merely illustrative in nature and is in no way intended to limit the invention, its applications, or its uses.

(Embodiment 1)
FIG. 1 shows an exploded perspective view of a vehicle back door 1 according to Embodiment 1 of the present invention. FIG. 2 shows a front view of the inner panel 10 viewed from the rear side of the vehicle. FIG. 3 shows a cross-sectional view taken along the line III--III in FIG. 2. FIG. 4 shows an enlarged view of region IV surrounded by the dashed line in FIG. FIG. 5 shows an enlarged view of the region V surrounded by the dashed-dotted line in FIG.

As shown in FIGS. 1 to 3, the vehicle back door 1 is made up of an inner panel 10 and an outer panel 20 joined at their outer peripheral edges so as to have an internal space 30.

Both the inner panel 10 and the outer panel 20 are molded from a resin material. A substantially rectangular inner panel side opening 10a is formed in the upper center of the inner panel 10 in the vehicle width direction. A substantially rectangular rising wall 11 rising toward the rear of the vehicle is formed at the outer peripheral edge of the inner panel side opening 10a. The tip of this rising wall 11 constitutes a first adhesive portion 12 that is adhered to the outer peripheral edge of an outer panel side opening 20a, which will be described later, of the outer panel 20. The outer peripheral edge of the inner panel 10 is formed to be recessed toward the vehicle rear side (internal space 30 side). This concave portion is arranged along the entire circumference of the outer peripheral edge of the inner panel 10 so as to correspond to a weather strip S to be described later. The outer peripheral edge of the recessed portion constitutes a second adhesive portion 13 that is adhered to the outer peripheral edge of the outer panel 20.

The outer panel 20 is arranged on the vehicle rear side of the inner panel 10. A substantially rectangular outer panel side opening 20a is formed in the upper center of the outer panel 20 in the vehicle width direction so as to correspond to the inner panel side opening 10a. A window glass 21 is attached to this outer panel side opening 20a. A substantially trapezoidal license plate accommodating portion 22 is formed in the lower part of the outer panel 20 at substantially the center in the vehicle width direction. The license plate accommodating portion 22 is formed to be recessed toward the vehicle front side (internal space 30 side). A license plate 23 is installed at the bottom of the license plate accommodating portion 22.

As shown in FIGS. 3 to 5, the interior space 30 includes a generally rectangular annular large space 31 having a relatively large length (cross-sectional thickness) in the longitudinal direction of the vehicle, and a large space 31 adjacent to the large space 31. A substantially trapezoidal first small space portion 32, which is provided adjacent to the large space portion 31 and has a relatively small length in the longitudinal direction of the vehicle; It has a rectangular annular second small space part 33. In detail, the first small space part 32 has a smaller length in the vehicle longitudinal direction than the large space part 31, and the second small space part 33 has a smaller length in the vehicle longitudinal direction than the first small space part 32. .

The large space portion 31 is formed in the lower part of the vehicle back door 1. The large space portion 31 is divided by the inner panel 10, the outer panel 20, the rising wall 11 of the inner panel 10, and a first partition rib 40 and a second partition rib 41, which will be described later.

The first small space portion 32 is formed with a substantially rectangular cross section at the center portion of the lower portion of the vehicle back door 1 in the vehicle width direction so as to correspond to the bottom portion of the license plate accommodating portion 22 . The first small space portion 32 is defined by the inner panel 10, the outer panel 20, and the first partition rib 40. The first small space part 32 is arranged so as to be surrounded by the large space part 31.

The second small space portion 33 is formed at the outer peripheral edge of the vehicle back door 1 to have a substantially triangular cross section. The second small space portion 33 is defined by the inner panel 10, the outer panel 20, and the second partition rib 41. The second small space 33 is arranged to surround the large space 31.

3 to 5, the large space 31 between the rising wall 11 of the inner panel 10 and the first partition rib 40, the first small space 32, the first partition rib 40 and the second partition rib 41, A large space 31 between the two and a second small space 33 are juxtaposed in this order from above.

As shown in FIGS. 2 to 5, on the vehicle rear side surface of the inner panel 10 (inner surface facing the interior space 30), there is a substantially trapezoidal groove separating the large space 31 and the first small space 32. The first partition rib 40 and the substantially rectangular second partition rib 41 that separates the large space portion 31 and the second small space portion 33 are integrally formed.

Both the first partition rib 40 and the second partition rib 41 are molded from a resin material. The first partition rib 40 and the second partition rib 41 are formed to extend from the inner panel 10 toward the vehicle rear side. The first partition rib 40 is arranged to correspond to the outer peripheral edge of the bottom of the license plate accommodating portion 22 . The second partition rib 41 is disposed near the outer peripheral edge of the inner panel 10 and inwardly from the second adhesive portion 13 over its entire circumference.

A first gap 42 is formed between the tip of the first partition rib 40 and the outer panel 20. A second gap 43 is formed between the tip of the second partition rib 41 and the outer panel 20.

A first soundproofing material 50 is sandwiched between the first gap 42 and the second gap 43. This first soundproofing material 50 is made of closed cell foam. A closed-cell foam is a porous material in which there are many air bubbles within a solid substance, and the gas in the air bubbles is independent of each other. Closed cell foam has sound insulation and buffering properties.

As shown in FIG. 4, the first soundproofing material 50 sandwiched between the first gap 42 is folded back at the tip of the first partition rib 40, and the first soundproofing material 50 is folded back at the tip of the first partition rib 40, and the surface of the first partition rib 40 on the large space 31 side 1 and the surface on the small space section 32 side. The first soundproofing material 50 sandwiched between the first gaps 42 has a part attached to the surface of the first partition rib 40 on the large space part 31 side, and a part attached to the surface of the first small space part 32 side. longer than

As shown in FIG. 5, the first soundproofing material 50 sandwiched between the second gap 43 is folded back at the tip of the second partition rib 41, and the first soundproofing material 50 is folded back at the tip of the second partition rib 41, and the surface of the second partition rib 41 on the large space 31 side 2 and the surface on the small space portion 33 side. The first soundproofing material 50 sandwiched between the second gap 43 has a part attached to the surface of the second partition rib 41 on the large space part 31 side, and a part attached to the surface of the second small space part 33 side. longer than

As shown in FIGS. 3 to 5, second soundproofing materials 60 are provided on the rear side of the vehicle facing the first small space 32 and the second small space 33 in the inner panel 10, respectively. This second soundproofing material 60 is made of closed cell foam or open cell foam. Open-cell foam is a porous material in which there are many air bubbles within a solid substance, and the gas in the air bubbles are interconnected. Open cell foam has sound absorption properties.

The second soundproofing material 60 provided in the first small space 32 is attached to the entire surface of the inner panel 10 on the rear side of the vehicle facing the first small space 32 in the vertical direction. The second soundproofing material 60 provided in the second small space 33 is bent at the corner formed by the inner panel 10 and the second partition rib 41, and is bent at the upper and lower sides of the vehicle rear side surface of the inner panel 10. It is affixed over the entire direction, and is affixed to the surface of the second partition rib 41 on the second small space portion 33 side. In the second soundproofing material 60 provided in the second small space portion 33, the portion attached to the inner panel 10 is longer than the portion attached to the second partition rib 41.

The vehicle back door 1 configured in this manner is attached via a hinge (not shown) to the outer peripheral edge of an opening a formed at the rear of the vehicle A of an automobile A shown by a phantom line in FIG. It is designed to open and close.

As shown in FIGS. 1 and 3, a weather strip S is installed on the outer peripheral edge of the opening a formed at the rear of the vehicle over the entire circumference. When the vehicle back door 1 closes the opening a, the space between the vehicle and the vehicle back door 1 is sealed. In this state, the weather strip S comes into contact with a recess formed in the outer peripheral edge of the inner panel 10. The weather strip S is, for example, a sealing member made of a hollow resin material. Since the structure of the weather strip S is well known, detailed explanation will be omitted.

Therefore, in the first embodiment, partition ribs 40 and 41 are formed on the inner surface of the inner panel 10 facing the internal space 30, and partition ribs 40 and 41 are formed to separate the large space 31 and the small spaces 32 and 33. Gaps 42 and 43 are formed between the tips of the ribs 40 and 41 and the outer panel 20, respectively, and a first soundproof material 50 is sandwiched between these gaps 42 and 43. Therefore, the first soundproofing material 50 prevents the muffled sound B shown in FIGS. 4 and 5 generated in the large space 31 from being transmitted to the small spaces 32 and 33 where the sound damping effect of air is lower than that of the large space 31. Therefore, it is possible to suppress the muffled sound B generated in the interior space 30 of the vehicle back door 1 from being transmitted into the vehicle interior.

Furthermore, since the first soundproofing material 50 is made of a closed-cell foam having sound insulation performance, it further suppresses the muffled sound B generated in the large space 31 from permeating into the small spaces 32 and 33. be able to. Furthermore, since the closed-cell foam also has buffering performance, it is possible to suppress denting of the outer panel 20 due to external force, and it is possible to improve the appearance of the outer panel 20.

Further, since the second soundproofing material 60 is provided on the surface of the inner panel 10 facing the small space 32 and on the surfaces of the inner panel 10 and the partition rib 41 facing the small space 33, this second soundproofing material 60 is provided. The material 60 can prevent the external sound C shown in FIGS. 4 and 5 generated outside the vehicle from transmitting into the vehicle interior through the small spaces 32 and 33 where the damping effect of air is relatively low. .

Furthermore, since gaps 42 and 43 are formed between the ends of the partition ribs 40 and 41 and the outer panel 20, respectively, the generation of friction noise due to direct contact between the ends of the partition ribs 40 and 41 and the outer panel 20 is prevented. Can be suppressed.

Further, even if the ends of the partition ribs 40 and 41 are tried to be pressed against the outer panel 20 by the weather strip S when the vehicle back door 1 closes the opening a formed at the rear of the vehicle, the partition ribs 40 and Since gaps 42 and 43 are formed between the tips of the partition ribs 40 and the outer panel 20, the tips of the partition ribs 40 and 41 are prevented from being pressed against the outer panel 20 by the gaps 42 and 43, respectively. . Furthermore, since the first soundproof material 50 is sandwiched between the gaps 42 and 43, the tips of the partition ribs 40 and 41 are further prevented from being pressed against the outer panel 20. Therefore, denting of the outer panel 20 due to external force can be suppressed, and the appearance of the outer panel 20 can be improved.

(Embodiment 2)
FIG. 6 shows an enlarged view of the first soundproofing material 50 according to the second embodiment. In the second embodiment, as shown in FIG. 6, the first soundproof material 50 is made of adhesive. In FIG. 6, only the first soundproof material 50 sandwiched between the second gap 43 is illustrated. As this adhesive, it is preferable to use a urethane adhesive or an epoxy adhesive. Urethane adhesives have urethane resin as their main component. Urethane adhesives generally have excellent elasticity. Epoxy adhesives have epoxy resin as a main component. Epoxy adhesives generally have excellent adhesive strength.

The rest of the configuration is the same as in the first embodiment, so the same components are given the same reference numerals and detailed explanation thereof will be omitted.

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

Further, since the first soundproofing material 50 is made of adhesive, the partition ribs 40 and 41 can be reliably fixed to the outer panel 20 by the adhesive 50, and the partition ribs 40 and 41 can be fixed to the outer panel 20. It can be a pillar supported from the interior space 30. Therefore, the rigidity of the vehicle back door 1 can be improved.

(Other embodiments)
In each of the embodiments described above, the partition ribs 40 and 41 are formed on the surface of the inner panel 10 on the vehicle rear side, but they may be formed on the surface of the outer panel 20 on the vehicle front side (the inner surface facing the interior space 30). In this case, gaps are formed between the ends of the partition ribs 40, 41 and the inner panel 10, and the first soundproof material 50 is sandwiched between these gaps.

Further, the arrangement of the first soundproofing material 50 is not limited to that shown in each of the above embodiments. For example, the first sound insulating material 50 made of a foam sandwiched between the gaps 42 and 43 is folded back at the tips of the partition ribs 40 and 41, and covers the entire surface of the partition ribs 40 and 41 on the large space 31 side. It may be attached to the entire surface of the small space portions 32 and 33 side, or it may be made to cover only the tips of the partition ribs 40 and 41.

Further, the arrangement of the second soundproofing material 60 is not limited to that shown in each of the above embodiments, and the second soundproofing material 60 may be arranged in a small area in at least one of the inner panel 10, the outer panel 20, and the partition ribs 40, 41. It may be provided on the surface facing the spaces 32 and 33. For example, the second soundproofing material 60 may be provided only on the surface of the outer panel 20 facing the small spaces 32 and 33 on the vehicle front side, or only on the surface of the partition ribs 40 and 41 facing the small spaces 32 and 33. may be provided. Further, the second soundproofing material 60 may be provided on all of the surfaces of the inner panel 10, the outer panel 20, and the partition ribs 40, 41 that face the small spaces 32, 33.

Further, in each of the above embodiments, the inner panel 10 and the outer panel 20 are molded from a resin material, but they may be molded from a metal material such as iron.

INDUSTRIAL APPLICATION This invention can be utilized for a back door for vehicles.

1 Vehicle back door 10 Inner panel 20 Outer panel 30 Internal space 31 Large space 32 First small space 33 Second small space 40 First partition rib 41 Second partition rib 42 First gap 43 Second gap 50 First Soundproofing material 60 Second soundproofing material

Claims (6)

A vehicle back door (1) formed by combining an inner panel (10) and an outer panel (20) so as to have an internal space (30),
The interior space (30) is provided adjacent to a large space part (31) whose length in the longitudinal direction of the vehicle is relatively large, and is provided adjacent to the large space part (31), whose length in the longitudinal direction of the vehicle is relatively large. It has a small space part (32, 33) that is small in size,
On the inner surface of one of the inner panel (10) and the outer panel (20) facing the internal space (30), there is a partition wall separating the large space (31) and the small space (32, 33). Ribs (40, 41) are formed;
A gap (42, 43) is formed between the tip of the partition rib (40, 41) and the other of the inner panel (10) and the outer panel (20),
A first soundproofing material (50) is sandwiched between the gaps (42, 43),
The above gaps (42, 43) are sealed only with the first soundproofing material (50).
A vehicle back door (1) characterized by: In the vehicle back door (1) according to claim 1,
The partition rib (41) extends along the outer peripheral edge of the joined body of the inner panel (10) and the outer panel (20), and forms the small space (33) at the outer peripheral edge.
A vehicle back door (1) characterized by: In the vehicle back door (1) according to claim 1 or 2 ,
A vehicle back door (1) characterized in that the first soundproofing material (50) is made of closed cell foam. In the vehicle back door (1) according to claim 3,
The first soundproofing material (50) is folded back at the tip of the partition rib (40, 41) and is pasted on the side surface of the partition rib (40, 41).
A vehicle back door (1) characterized by: In the vehicle back door (1) according to claim 1 or 2 ,
A vehicle back door (1) characterized in that the first soundproofing material (50) is made of adhesive. The vehicle back door (1) according to any one of claims 1 to 5 ,
A second soundproofing material (60) is provided on the surface of at least one of the inner panel (10), the outer panel (20), and the partition rib (40, 41) facing the small space (32, 33). A vehicle back door (1) characterized by being provided with a vehicle back door.

Images