JP2021084505A - Vehicular back door - Google Patents

Abstract

To inhibit muffled sound occurring in an internal space of a vehicular back door from being transmitted into a passenger compartment.SOLUTION: A vehicular back door 1 is formed by coupling an inner panel 10 and an outer panel 20 to form an internal space 30. The internal space 30 has: a large space part 31 having a relatively large length as seen in a vehicle fore-and-aft direction; and small space parts 32, 33 which are provided adjacent to the large space part 31 and have relatively small lengths as seen in the vehicle fore-and-aft direction. Partition wall ribs 40, 41 partitioning the large space part 31 from the small space parts 32, 33 are formed on an inner surface, facing the internal space 30, of one 10 of the inner panel 10 and the outer panel 20. Gaps 42, 43 are respectively formed between tips of the partition ribs 40, 41 and the other 20 of the inner panel 10 and the outer panel 20. A first soundproof material 50 is sandwiched between the gaps 42, 43.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle back door.

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

Japanese Patent No. 4284266

By the way, the sound or vibration generated in the vehicle may cause resonance in the internal space of the back door, resulting in a muffled sound. If this muffled sound is transmitted into the vehicle interior, there is a problem that it becomes noise inside the vehicle.

The present invention has been made in view of such a point, and an object of the present invention is to suppress the muffled sound generated in the internal space of the vehicle back door from being transmitted into the vehicle interior.

In order to achieve the above object, in the present invention, a partition wall rib is formed to separate a large space portion and a small space portion of the internal space of the back door, and between the tip of the partition wall 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 connecting an inner panel and an outer panel so as to have an internal space, and the internal space has a relatively large length in the vehicle front-rear direction. It has a large space portion and a small space portion provided adjacent to the large space portion and having a relatively small length in the front-rear direction of the vehicle, and faces the internal space of one of the inner panel and the outer panel. On the inner surface, a partition rib that separates the large space and the small space is formed, and a gap is formed between the tip of the partition rib and the other of the inner panel and the outer panel. The first soundproofing material is sandwiched between the gaps.

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

The third invention is characterized in that, in the first invention, the first soundproofing material is composed of an adhesive.

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

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

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

Further, since the closed cell foam also has a cushioning performance, it is possible to suppress the dent of the outer panel due to an 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 composed of an adhesive, the partition wall rib can be securely fixed to the other of the inner panel and the outer panel, and the partition wall rib can be fixed to the outer panel. Can be used as a support to support from the internal space. Therefore, the rigidity of the vehicle back door can be improved.

According to the fourth invention, a second soundproofing material is provided on the surface of at least one of the inner panel, the outer panel, and the partition ribs facing the small space portion. Therefore, the second soundproofing material is used outside the vehicle. It is possible to suppress the generated external sound from penetrating into the vehicle interior through a small space having a relatively low damping effect due to air.

It is an exploded perspective view of the back door for a vehicle which concerns on Embodiment 1. FIG. It is a front view which looked at the inner panel from the rear side of a vehicle. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. It is an enlarged view of the region IV surrounded by the alternate long and short dash line in FIG. It is an enlarged view of the region V surrounded by the alternate long and short dash line in FIG. It is a figure corresponding to FIG. 5 which shows the 1st soundproofing material which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the present invention, its applications or its uses.

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

As shown in FIGS. 1 to 3, the vehicle back door 1 is formed by connecting the inner panel 10 and the outer panel 20 at the outer peripheral edge portion so as to have an internal space 30.

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

The outer panel 20 is arranged on the rear side of the inner panel 10 of the vehicle. A substantially rectangular outer panel side opening 20a is formed in the central portion of the upper part 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 the outer panel side opening 20a. A substantially trapezoidal license plate accommodating portion 22 is formed in a substantially central portion in the vehicle width direction at the lower portion of the outer panel 20. The license plate accommodating portion 22 is formed so as to be recessed toward the front side of the vehicle (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 internal space 30 is adjacent to a substantially rectangular annular large space portion 31 having a relatively large length (cross-sectional thickness) in the vehicle front-rear direction and the large space portion 31. The first small space portion 32, which is substantially trapezoidal and has a relatively small length in the front-rear direction of the vehicle, and the large space portion 31 are provided so as to be adjacent to each other and have a relatively small length in the front-rear direction of the vehicle. It has a rectangular annular second small space portion 33. In detail, the first small space portion 32 has a shorter length in the vehicle front-rear direction than the large space portion 31, and the second small space portion 33 has a shorter length in the vehicle front-rear direction than the first small space portion 32. ..

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

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

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

As shown in FIGS. 2 to 5, the inner surface of the inner panel 10 on the rear side of the vehicle (inner surface facing the internal space 30) has a substantially trapezoidal shape that separates the large space portion 31 and the first small space portion 32. The 1 partition rib 40 and the substantially rectangular second partition rib 41 that separates the large space 31 and the second small space 33 are integrally formed.

Both the first partition rib 40 and the second partition rib 41 are made of a resin material. The first partition rib 40 and the second partition rib 41 are formed so as to extend from the inner panel 10 toward the rear side of the vehicle. The first partition rib 40 is arranged so as to correspond to the outer peripheral edge portion of the bottom portion of the license plate accommodating portion 22. The second partition rib 41 is arranged in the vicinity of the outer peripheral edge of the inner panel 10 and inward of the second adhesive portion 13 over the entire circumference thereof.

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. The first soundproofing material 50 is made of a closed cell foam. A closed cell foam is a porous material in which a large number of bubbles are contained in a solid substance and the gases in the bubbles are independent of each other. The closed cell foam has sound insulation performance and cushioning performance.

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

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

As shown in FIGS. 3 to 5, second soundproofing materials 60 are provided on the surfaces of the inner panel 10 on the rear side of the vehicle facing the first small space portion 32 and the second small space portion 33, respectively. The second soundproofing material 60 is composed of a closed cell foam or an open cell foam. The open cell foam is a porous material in which a large number of bubbles are contained in a solid substance and the gases in the bubbles are continuous with each other. The open cell foam has sound absorbing performance.

The second soundproofing material 60 provided in the first small space portion 32 is attached to the inner panel 10 over the entire vertical direction of the surface on the rear side of the vehicle facing the first small space portion 32. 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 vertically above and below the surface of the inner panel 10 on the rear side of the vehicle. It is attached over the entire direction and is attached to the surface of the second partition wall rib 41 on the side of the second small space portion 33. The second soundproofing material 60 provided in the second small space 33 has a longer sticking portion to the inner panel 10 than a sticking portion to the second partition rib 41.

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

As shown in FIGS. 1 and 3, a weather strip S is provided on the outer peripheral edge of the opening a formed at the rear of the vehicle over the entire circumference thereof. When the vehicle back door 1 closes the opening a, the vehicle and the vehicle back door 1 are sealed. In this state, the weather strip S comes into contact with the recessed portion formed on 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 known, detailed description thereof will be omitted.

Therefore, in the first embodiment, partition wall ribs 40, 41 separating the large space portion 31 and the small space portions 32, 33 are formed on the inner surface of the inner panel 10 facing the internal space 30, and these partition walls are formed. Spaces 42 and 43 are formed between the tips of the ribs 40 and 41 and the outer panel 20, respectively, and the first soundproofing material 50 is sandwiched between these gaps 42 and 43. Therefore, the muffled sound B shown in FIGS. 4 and 5 generated in the large space 31 by the first soundproofing material 50 has a lower sound attenuation effect due to air than the large space 31, 32, 33. It is possible to suppress the permeation of the muffled sound B generated in the internal space 30 of the vehicle back door 1 into the vehicle interior.

Further, 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 portion 31 from penetrating into the small space portions 32 and 33. be able to. Further, since the closed cell foam also has a cushioning performance, it is possible to suppress a dent of the outer panel 20 due to an 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 the surface of the inner panel 10 and the partition rib 41 facing the small space 33, the second soundproofing material 60 is provided. The material 60 can prevent the external sound C generated outside the vehicle from being transmitted into the vehicle interior through the small spaces 32 and 33 having a relatively low damping effect due to air. ..

Further, since the gaps 42 and 43 are formed between the tips of the partition ribs 40 and 41 and the outer panel 20, respectively, friction noise is generated due to the direct contact between the tips of the partition ribs 40 and 41 and the outer panel 20. It can be suppressed.

Further, even if the tips of the partition ribs 40 and 41 are pressed against the outer panel 20 by the weather strip S in a state where the vehicle back door 1 closes the opening a formed at the rear of the vehicle, the partition ribs 40, Since gaps 42 and 43 are formed between the tip of the 41 and the outer panel 20, respectively, it is possible to prevent the tips of the partition ribs 40 and 41 from being pressed against the outer panel 20 by the gaps 42 and 43. .. Further, since the first soundproofing material 50 is sandwiched between the gaps 42 and 43, it is further suppressed that the tips of the partition wall ribs 40 and 41 are pressed against the outer panel 20. Therefore, the dent of the outer panel 20 due to the 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 soundproofing material 50 is composed of an adhesive. In FIG. 6, only the first soundproofing material 50 sandwiched between the second gaps 43 is shown. As this adhesive, it is preferable to use a urethane-based adhesive or an epoxy-based adhesive. Urethane-based adhesives contain urethane resin as the main component. Urethane-based adhesives generally have excellent elasticity. The epoxy adhesive contains an epoxy resin as a main component. Epoxy adhesives generally have excellent adhesive strength.

Others are configured in the same manner as in the first embodiment, so that the same components are designated by the same reference numerals and detailed description thereof will be omitted.

Therefore, in the second embodiment, the same effect as that of the first embodiment can be obtained.

Further, since the first soundproofing material 50 is made of an adhesive, the partition wall ribs 40 and 41 can be securely fixed to the outer panel 20 by the adhesive material 50, and the partition wall ribs 40 and 41 can be attached to the outer panel 20. It can be a support column supported from the internal space 30. Therefore, the rigidity of the vehicle back door 1 can be improved.

(Other embodiments)
In each of the above embodiments, the partition ribs 40 and 41 are formed on the vehicle rear side surface of the inner panel 10, but may be formed on the vehicle front side surface (inner surface facing the internal space 30) of the outer panel 20. In this case, a gap is formed between the tips of the partition ribs 40 and 41 and the inner panel 10, and the first soundproofing 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 soundproofing material 50 made of foam sandwiched between the gaps 42 and 43 is folded back at the tips of the partition ribs 40 and 41, and is covered with the entire surface of the partition ribs 40 and 41 on the large space 31 side. It may be attached to the entire surface on the side of the small space portions 32 and 33, or may cover only the tips of the partition wall 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 is small 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 space portions 32 and 33. For example, the second soundproofing material 60 may be provided only on the surface of the outer panel 20 on the front side of the vehicle facing the small spaces 32 and 33, or only on the surfaces of the partition ribs 40 and 41 facing the small spaces 32 and 33. It may be provided in. Further, the second soundproofing material 60 may be provided on all the surfaces of the inner panel 10, the outer panel 20, and the partition ribs 40, 41 facing the small space portions 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 may be molded from a metal material such as an iron material.

The present invention can be applied to a vehicle back door.

1 Back door for vehicle 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 (4)

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 internal space (30) is provided so as to be adjacent to a large space portion (31) having a relatively large length in the vehicle front-rear direction and the large space portion (31), and the length in the vehicle front-rear direction is relative to each other. Has a small space (32, 33)
On the inner surface of one of the inner panel (10) and the outer panel (20) facing the internal space (30), a partition wall separating the large space portion (31) and the small space portion (32, 33) is provided. 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 vehicle back door (1) characterized in that a first soundproofing material (50) is sandwiched in the gaps (42, 43). In the vehicle back door (1) according to claim 1.
The first soundproofing material (50) is a vehicle back door (1) characterized in that it is made of a closed cell foam. In the vehicle back door (1) according to claim 1.
The vehicle back door (1), wherein the first soundproofing material (50) is made of an adhesive. In the vehicle back door (1) according to any one of claims 1 to 3.
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 portion (32, 33). A vehicle back door (1) characterized by being provided.

Images