JP2006232157A - Door structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door structure of an automobile capable of increasing low frequency sound from which an occupant can pick up on the atmosphere of dignity while preventing deterioration of sound quality of a speaker and enlargement of motor noise and increasing the low frequency sound from which the occupant is sensible of dignity by generating a low level mode such as 1×1 mode in such a simple structure as not to badly influence upon cost, weight and workability. <P>SOLUTION: This door structure of the automobile has a door outer panel 2, a door inner panel 6 furnished with a door latch 16 and a resin made door module 8, the door module is formed to be divided into a supporting region to support a door functional part to generate the sound and a increasing region 8a to increase acoustic conversion efficiency of vibration of a specific low frequency out of the vibration generated in closing a door, and acoustic radiation efficiency of the supporting region is lower than acoustic radiation efficiency of the increasing region. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automobile door structure, and more particularly to an automobile door structure that is supported on a vehicle body by a door latch so as to be opened and closed.

  Conventionally, as a technique for suppressing vibration noise of a door, for example, Patent Document 1 discloses a technique related to a sound absorbing material provided in a door. To block. Further, as a technique for preventing abnormal noise when the door is closed, Patent Document 2 discloses a door structure in which a contact portion is provided at a predetermined position of a door inner panel that contacts a door switch provided on the vehicle body side when the door is closed. The disclosed door structure suppresses vibration of the inner panel when the door is closed.

JP 2003-118364 A JP-A-10-138759

Here, as for the door closing sound generated when the door is closed, the low frequency sound having a low frequency is higher than the high frequency sound having a high frequency. Therefore, in order to improve the merchantability as an automobile, it is desired to increase low frequency sound among door closing sounds radiated from the door.
However, the door structures of Patent Document 1 and Patent Document 2 described above cannot increase low-frequency sound.
Here, in recent years, mainly for the purpose of cost reduction, door functional parts such as a window regulator and a speaker are modularized in advance and provided on the inner panel of the door. In order to increase the low-frequency sound in such a door module, the present applicant, for example, uses a rib or bead formed over the entire door module so that the door module has a 1 × 1 mode. Has proposed a door structure that makes it easy to generate low-order mode vibrations and increases the acoustic conversion efficiency of specific low-frequency vibrations that allow passengers to feel heavy (Japanese Patent Application No. 2004-280372). ).

With such a door structure, the low frequency sound can be increased and the occupant can feel the heavyness. However, the following problems may occur.
First, as a result of increasing the acoustic conversion efficiency of the door module, even the sound (vibration) of door functional parts such as speakers and window regulator motors assembled to the door module is easily emitted from the door module, and the passenger However, there are cases where the sound quality of the speaker that listens to deteriorates and the motor noise increases. On the other hand, measures such as attaching a damping material are effective in solving such problems, but the weight tends to increase.
Next, the door module is formed in accordance with the shape of the door, and when the aspect ratio of the door shape is not close to 1: 1, the low order mode such as the 1 × 1 mode is generated. It was sometimes difficult.

  Therefore, the present invention has been made to solve the above-described problems. For example, the sound quality of a speaker listened to by the occupant is prevented from deteriorating or the motor noise is increased, while the occupant is heavy. An object of the present invention is to provide an automobile door structure that can increase low-frequency sound. Further, a low-order mode such as the 1 × 1 mode is generated with a simple structure that does not adversely affect the cost, weight, and workability, and the low-frequency sound that can make the passenger feel heavy is increased. The purpose is to provide a car door structure that can be used.

In order to achieve the above object, the present invention provides an automobile door structure that is supported on a vehicle body by a door latch so as to be openable and closable, and includes a door outer panel, a door latch disposed on a vehicle compartment side of the door outer panel, and an opening. And a resin door module attached to the door inner panel so as to cover the opening of the door inner panel, and the door module is at least a door that generates sound. It is formed to be divided into a support area that supports the functional parts and an increase area that increases the acoustic conversion efficiency of specific low-frequency vibrations of the vibration that occurs when the door is closed. It is characterized by being lower than the acoustic radiation efficiency.
In the present invention configured as described above, the door module has an increased region that increases the acoustic conversion efficiency of a specific low-frequency vibration among the vibrations generated when the door is closed. The specific low frequency vibrational energy that can be felt is converted into increased acoustic radiation energy. As a result, the low frequency sound radiated from the increased area of the door module can be increased, and the occupant can feel the door closing sound heavy. Further, the increased low frequency sound is radiated to the space between the door outer panel and the door inner panel, and is further transmitted to the outside of the vehicle through the door outer panel. The door closing sound transmitted through the door outer panel attenuates the high frequency component, so that the passengers outside the vehicle can feel the solidness more reliably.
In addition, the door module is divided into at least a support region that supports the door functional component that generates sound and an increase region that increases the acoustic conversion efficiency of a specific low-frequency vibration among the vibrations generated when the door is closed. Since the acoustic radiation efficiency of the support area is lower than the acoustic radiation efficiency of the increase area, even if the low frequency sound of the door closing sound is increased, the sound of a door functional part that generates sound, for example, the sound of a speaker or a motor And vibration can be prevented from being radiated indoors from the door module. Therefore, for example, it is possible to prevent the sound quality of the speaker from being deteriorated and the noise in the room from increasing.

In the present invention, preferably, the increase region is formed on the rear side near the door latch of the door module, and the support region is formed on the front side.
In the present invention configured as described above, the increased region is formed on the rear side close to the door latch of the door module, so that the vibration at the time of closing the door, which mainly occurs on the door latch side, is directly attenuated. It can be transmitted to the increased area. As a result, low-frequency vibration can be radiated more reliably and reliably in the increase region. In addition, since the support region is formed on the front side, it is possible to prevent the vibration generated when the door is closed mainly from the door latch side from being attenuated.

In the present invention, preferably, the rigidity of the support region is larger than the rigidity of the increase region.
In the present invention configured as described above, since the rigidity of the support region is larger than the rigidity of the increase region, the door functional component can be reliably held. In addition, because the rigidity of the support area is large, the rigidity of the entire door module can be easily increased. As a result, the rigidity can be secured even if the plate thickness of the door module is made thinner than before, thereby reducing the weight. I can plan. Further, since the rigidity of the increased region is smaller than the rigidity of the support region, it is easy to vibrate, and low frequency sound can be reliably increased and radiated.

In the present invention, it is preferable that the vibration damping capacity of the support region is larger than the damping capacity of the increasing region.
In the present invention configured as described above, the vibration damping capacity of the support area is larger than the damping capacity of the increase area, so that the noise and vibration of the door functional parts are absorbed or attenuated, thereby increasing the indoor noise. Can be prevented. On the other hand, the low-frequency door closing sound that allows the occupant to feel heavy can be greatly radiated without absorbing or attenuating.

In the present invention, a window regulator mounting reinforcing portion is preferably formed in the boundary region between the increase region and the support region.
In the present invention configured as above, since the reinforcing portion for attaching the window regulator is formed in the boundary region between the increase region and the support region, the increase region can be partitioned (formed) with a simple structure. In addition, the low frequency sound can be more reliably increased in the increased region by preventing the vibration in the increased region from being transmitted to the support region.

In the present invention, it is preferable that the door functional component that generates sound includes a speaker.
In the present invention configured as described above, the sound of the speaker is not easily emitted from the door module and can be emitted only from the speaker, so that the passenger can feel the sound of the speaker as good. .

Further, the present invention is a door structure of an automobile that is supported on a vehicle body by a door latch so as to be freely opened and closed. The door outer panel is disposed on a vehicle compartment side of the door outer panel and includes a door latch and further includes an opening. A door inner panel, and a resin door module attached to the door inner panel so as to cover an opening of the door inner panel. The door module has a vibration area having an aspect ratio of approximately 1: 1. It is characterized by being formed.
In the present invention configured as described above, the door module is formed with a vibration region having an aspect ratio of approximately 1: 1. Therefore, vibration of 1 × 1 mode, which is low-frequency vibration, is formed in this vibration region. Can be easily generated. Therefore, in this vibration region, it is possible to increase the low-frequency sound emitted from the door module by increasing the acoustic conversion efficiency of a specific low-frequency vibration among the vibrations generated when the door is closed. As a result, the passenger can feel the door closing sound profound. Further, the increased low frequency sound is radiated to the space between the door outer panel and the door inner panel, and is further transmitted to the outside of the vehicle through the door outer panel. The door closing sound transmitted through the door outer panel attenuates the high frequency component, so that the passengers outside the vehicle can feel the solidness more reliably.

In the present invention, it is preferable that the vibration region is formed on the rear side near the door latch of the door module.
In the present invention configured as described above, the vibration region is formed on the rear side close to the door latch of the door module, so that the vibration generated when the door is closed mainly on the door latch side is directly attenuated without being attenuated. It can be transmitted to a 1: 1 vibration region. As a result, low-frequency vibration can be radiated more reliably and reliably in the vibration region.

In the present invention, it is preferable that the vibration region is partitioned and formed by forming a window regulator attaching reinforcing portion in a boundary region with other regions.
In the present invention configured as described above, the vibration region can be formed with a simple structure by the reinforcing portion for attaching the window regulator. Further, the window regulator mounting reinforcing portion can prevent the vibration in the vibration region from being transmitted to other regions, so that the low frequency sound can be more reliably increased in the vibration region.

In the present invention, it is preferable that the door module further includes a door function component support region having lower sound radiation efficiency than the vibration region, and a speaker is attached to the door function component support region.
In the present invention configured as described above, since the speaker is attached to the door functional part support area whose acoustic radiation efficiency is lower than the vibration area, the sound of the speaker is not radiated from the door module but radiated only from the speaker. Therefore, the passenger can feel the sound of the speaker good. In particular, since the speaker is not provided in the vibration region, it is possible to effectively prevent the sound of the speaker from being emitted from the door module and deteriorating its sound quality.

  According to the door structure of the automobile according to the present invention, for example, the sound quality of the speaker that the occupant listens to is deteriorated, and the low frequency sound that can be felt by the occupant is increased while preventing the motor noise from increasing. It can be made. Further, a low-order mode such as the 1 × 1 mode is generated with a simple structure that does not adversely affect the cost, weight, and workability, and the low-frequency sound that can make the passenger feel heavy is increased. I can do it.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, FIG. 1 is an exploded perspective view showing a basic structure of a front door to which an automobile door structure according to an embodiment of the present invention is applied, and FIG. 2 is a vehicle compartment showing a structure of a door inner panel and a door module of this embodiment. It is the top view seen from the side.
First, as shown in FIG. 1, the front door 1 includes a door outer panel 2 made of a steel plate, and the door outer panel 2 constitutes an outer portion of the front door 1. A window sash 4 made of steel plate is fixed to the door outer panel 2 by welding.
The front door 1 covers a door inner panel 6 made of a steel plate, which is provided on the passenger compartment side of the door outer panel 2 and is fixed to the door outer panel 2 by welding, and an opening 6 a of the door inner panel 6. The door module 8 is attached to the door inner panel 6 from the passenger compartment side, and the door inner panel 6 and the door module 8 constitute an inner portion of the front door 1. A door trim 10 is attached to a vehicle compartment side of the inner portion with a fastener clip or the like (not shown).

The door inner panel 6 has a front area 6b, a rear area 6c, an upper area 6d, and a lower area 6e on a panel surface formed around the opening 6a and facing the vehicle compartment. Further, the door inner panel 6 has a front end surface 6f that extends substantially perpendicularly from the door outer panel 2 toward the vehicle compartment side at the front end of the door inner panel 6 in the longitudinal direction of the vehicle body. A pair of door hinges 14 are fixed to the front end face 6f. These door hinges 14 are fixed to a vehicle body (not shown), and the front door 1 is supported by the vehicle body so as to be freely opened and closed.
Further, the door inner panel 6 has a rear end surface 6g that extends substantially perpendicularly from the door outer panel 2 to the passenger compartment side at the rear end of the door inner panel 6 in the longitudinal direction of the vehicle body. The rear end surface 6g and the rear region 6c are provided with a door latch portion 16 on the inner side thereof. The door latch portion 16 includes a door latch bracket 18 fixed to the door inner panel 6 and a door latch mechanism 20 fixed to the door latch bracket 18. When the door is closed, the door latch mechanism 20 engages with a striker (not shown) fixed to a pillar (not shown) of the vehicle body through a latch opening 6h formed in the door inner panel 6 to thereby engage the front door 1. Is held by the vehicle body in its closed position.

  Next, as shown in FIGS. 1 and 2, the door module 8 is formed in a substantially rectangular outer shape in which the length in the longitudinal direction of the vehicle body is longer than the length in the vertical direction of the vehicle body, while the opening of the door inner panel 6 is formed. The part 6 a is also formed in a shape substantially the same as the outer shape of the door module 8. The door module 8 is formed in a size that is slightly larger than the opening 6 a, and the peripheral edge thereof is connected to the peripheral edge of the opening 6 a of the door inner panel 6. As shown in FIG. 1, a plurality of mounting holes 6k for mounting the door module 8 along the opening 6a are formed in each of the regions 6b to 6e of the door inner panel 6 along the opening 6a. A plurality of mounting holes (insertion holes) 8k are formed in the peripheral portion of the door module 8 at positions corresponding to these holes 6k. As shown in FIG. 2 and will be described in detail later, the door module 8 is composed of a plurality of first connecting portions 22 and a plurality of second connecting portions 24 through the mounting holes 6k and 8k. 6 can be attached.

  As shown in FIG. 1, the door module 8 includes a window regulator 26, a speaker 28, a side impact pad member (impact absorbing member) 30, and harnesses (not shown) for supplying electricity to each door functional component. ), Cables (not shown) connected to the door latch mechanism 20 are attached. As shown in FIG. 2, a bad member-use recess 32 is formed in the door module, and a side-impact bad member (impact absorbing member) 30 (see FIG. 1) is fixed to the recess 32. ing. Further, the door module 8 includes a work hole 34 for connecting a door handle (not shown) attached to the door outer panel 2 and cables and performing other work, and the harnesses described above. And a harness hole 36 through which cables and the like are passed.

Next, the structure of the door module 8 of the present embodiment will be specifically described with reference to FIGS. FIG. 3 is a cross-sectional view showing the cross-sectional shape of the door module in the longitudinal direction of the vehicle body as viewed along the line III-III in FIG. 2, and FIG. 4 is a diagram for explaining a door module molding method using a microcell molding technique. It is sectional drawing of a metal mold | die and a resin injection apparatus.
First, as shown in FIGS. 2 and 3, the door module of the present embodiment is formed so as to be divided into a door closing sound increasing region 8a and a specific door functional component support region 8b.
The door closing sound increasing region 8 a is formed on the rear side near the door latch portion 16, and the specific door functional component support region 8 b is formed on the front side of the door module 8. In addition, as shown in FIG. 3, the door functional component support region 8b is molded such that the thickness t2 is larger than the thickness t1 of the door closing sound increasing region 8a.

The door closing sound increasing area 8a increases vibration energy of a specific low frequency that allows the occupant to feel heavyness among vibrations generated mainly on the side of the door latch portion 16 when the door is transmitted to the door module 8. This is an area in which the low frequency sound radiated from the door module 8 is increased by converting the sound radiated energy into the radiated energy. That is, in this region 8a, the acoustic conversion efficiency of such low frequency sound is enhanced.
On the other hand, the specific door functional component support region 8b is a region formed so that sound is not easily emitted from this region. The support area 8b is provided with door functional components that generate sound and vibration such as the speaker 28 and the motor 40 of the window regulator 26. In the support area 8b, the sound emitted from the speaker 28 is radiated only from the speaker 28, or the vibration sound of the motor 40 is hardly radiated from this area. That is, in this region 8b, the acoustic conversion efficiency of vibration is low.

  Further, a reinforcing rib 42 for attaching the window regulator 26 is formed in a boundary region 8c between the door closing sound increasing region 8a and the specific door functional component support region 8b. The reinforcing rib 42 extends in the vertical direction so as to divide the door closing sound increasing region 8a and the specific door functional part supporting region 8b, and the aspect ratio of the door closing sound increasing region 8a is approximately 1: 1. The door closing sound increasing region 8a is also divided, and the vibration of the door closing sound increasing region 8a is also blocked to prevent the vibration from being transmitted to the specific door functional component support region 8b.

In the present embodiment, the door module 8 is molded by a fine foam molding technique (microcell method) and core back molding so that the above-described regions 8a to 8c are formed.
Here, the microfoaming (microcell) molding technique will be described. This micro-foam molding technology is to impregnate a molten resin with a supercritical gas to form a single-phase dissolved fluid, and then inject this molten fluid into a mold and foam it by pressure reduction to create a fine and uniform foam structure. Is formed. CO2 or N2 is used as a supercritical gas. The dissolved fluid impregnated with these gases has a density of liquid at a temperature higher than a predetermined temperature (critical temperature) and a pressure higher than a predetermined pressure (critical pressure). Nearly, fluidity is in a gaseous state. That is, in such a dissolved fluid, the gas can actively move in the molten resin and uniformly diffuse deep into the molecule, so that a fine foam seed can be generated. Such a molten resin is foamed by core back, that is, by retreating the male mold and reducing the pressure. Then, by cooling, it can be cured in either a foamed state or a non-foamed state.

In this embodiment, glass long fiber polypropylene (GFPP) is used as the resin. A method for molding the door module of the present embodiment using such a fine foam molding technique and core back molding will be described.
First, as shown in FIG. 4A, a long glass fiber polypropylene is introduced into a cylinder 46 of an injection device 44 and impregnated with a supercritical gas. The melted polypropylene fluid 50 impregnated with the supercritical gas is heated by a heater 48 to a temperature above the critical temperature, and the inside of the cylinder is set to a pressure above the critical pressure.
Next, the supercritical gas-containing molten resin 50 in such a supercritical state is filled in the gap between the female mold 52 and the male molds 54 and 56. The male mold 56 is a movable part.

Next, as shown in FIG. 4B, after the filling of the dissolved fluid 50 into the gap between the female mold 52 and the male molds 54 and 56 is completed, the male mold 56 is cored back. That is, the movable male die 56 is formed in the shape of the door functional component support region 8b of the door module 8 in plan view, and the gap with the female die 52 is equal to the thickness t2 of the door functional component support region 8b. Until then, the male mold 56 is retracted in the out-of-plane direction of the door module 8. By such a core back, a gas in a supercritical state is foamed in the resin 50, and then cooled, thereby being cured in a state where fine and uniform foamed cells are generated.
On the other hand, the size of the gap between the female mold 52 and the male mold 54 is the same as the thickness of the door closing sound increasing region 8a of the door module 8, and this portion is not core-backed but cooled as it is and foamed. It cures without being.

  With such a fine foam molding technique and core back molding, as shown in FIG. 3, the plate thickness t2 of the door functional component support region 8b is increased and foamed. By such a large plate thickness and foaming, the rigidity of the door functional component support region 8b is enhanced, and vibrations in the region are absorbed or attenuated by the foamed air layer, so that sound is not easily emitted from the region. . On the other hand, since the door closing sound increasing region 8a is not foamed and has a small plate thickness, the vibration is difficult to attenuate and is easy to vibrate, and as a result, the sound is easily emitted. In this way, both the rigidity and the vibration damping capacity are large in the door functional component support area 8b, while both the rigidity and the vibration damping capacity are small in the door closing sound increasing area 8a.

Next, the structure of the door functional component support region 8b will be specifically described with reference to FIGS. FIG. 5 is a cross-sectional view of the motor accommodating recess as viewed along line VV in FIG.
First, as shown in FIG. 2, a speaker hole 60 is formed in a lower portion of the door functional part support area of the door module 8, and the speaker 28 is attached to the speaker hole 60.
Next, a motor accommodating recess 62 is formed above the speaker 28. As shown in FIG. 5, the motor accommodating recess 62 protrudes toward the passenger compartment, and the motor 40 of the window regulator 26 is accommodated and fixed therein. As shown in FIGS. 2 and 3, in the window regulator 26, the upper end and the lower end of the rail portion 26a are connected to the reinforcing rib 42 in the boundary region 8c described above, and the motor 40 is connected via the rail portion 26a. The window glass 64 (see FIG. 1) is raised and lowered.

Next, the structure of the door closing sound increasing region 8a will be described in detail with reference to FIGS. 6 is a cross-sectional view showing a fourth reinforcing structure provided in the working hole as seen along line VI-VI in FIG.
This door closing sound increasing region 8a is provided with low frequency sound increasing means. First, the low frequency sound increasing means will be described.
When the door is closed, vibration is generated mainly on the door latch portion 16 side of the door inner panel 6. This vibration is transmitted to the door inner panel 6 and further to the door module 8. It is necessary to attach various door functional parts (26, 28) to the door module 8 and to form recesses (32), holes (34, 36), and the like. Becomes complicated. The low-frequency sound increasing means adjusts the rigidity of the door module 8 having such a complicated shape and structure, so that the passenger can feel the heavyness among the vibrations transmitted to the door module 8. This increases the vibroacoustic conversion efficiency of low-frequency vibrations. That is, the specific low frequency vibration energy of the door module 8 is converted into increased acoustic radiation energy, and as a result, the low frequency sound radiated from the door module 8 can be increased.

  First, in the present embodiment, the door closing sound increasing region 8a is partitioned by the window regulator mounting reinforcing rib 42, which is a low-frequency sound increasing means, as described above, and the aspect ratio is approximately 1: 1. Therefore, vibration of 1 × 1 mode, which is low-frequency vibration, is easily generated. Further, the rigidity of the door closing sound increasing region 8a is adjusted by the reinforcing structure which is a low-frequency sound increasing means, and the door closing sound increasing region 8a is more easily and reliably vibrated in the 1 × 1 mode. And, by adjusting the rigidity by such a reinforcing structure, the low-frequency vibration of 200 Hz or less, particularly 10-100 Hz, which allows the occupant to feel the heavyness more reliably as the specific low-frequency vibration. The acoustic conversion efficiency of vibrations with a frequency of is increased. That is, in the present embodiment, the rigidity of the door closing sound increasing region 8a is adjusted by the low frequency sound increasing means so that 1 × 1 mode vibration is generated at a frequency of 200 Hz or less.

Next, the reinforcing structure constituting the low-frequency sound increasing means will be described with reference to FIGS.
First, as shown in FIGS. 2 and 3, the door module 8 is formed with a first reinforcing structure 70 that is formed integrally with the door module 8. The first reinforcing structure 70 is for adjusting the rigidity of the central region of the door closing sound increasing region 8a, and is located at substantially the center of the door closing sound increasing region 8a, and has a plurality of annular meats extending in an annular and concentric manner. It is comprised by thick part 70a-d. Here, the central region refers to a portion in the middle of the door closing sound increasing region 8a in the vehicle longitudinal direction and substantially in the vehicle vertical direction.
As shown in FIG. 2, the door module 8 is formed with a second reinforcing structure 72 that is molded integrally with the door module 8. The second reinforcing structure 72 adjusts the rigidity of the door closing sound increasing region 8a in the longitudinal direction of the vehicle body, and is substantially at the center of the door closing sound increasing region 8a from the door latch portion 16 side of the door closing sound increasing region 8a. The linear rib 72 extends linearly in the longitudinal direction of the vehicle body to the side of the reinforcing rib 42 for attaching the window regulator. The linear rib 72 is formed integrally with the plurality of thick portions 70a to 70d that are the first reinforcing structure.

Further, the door module 8 is formed with a third reinforcing structure 74 that is molded integrally with the door module 8. The third reinforcing structure 74 adjusts the rigidity of the outer peripheral region of the door closing sound increasing region 8a, and extends radially toward the substantially central portion of the door module 8 over substantially the entire outer peripheral region. It consists of a plurality of radial ribs 74 formed. Here, the outer peripheral region is a portion around the above-described central region, and includes a peripheral portion attached to the door inner panel 6.
Further, the door module 8 is formed with a fourth reinforcing structure 76 that is molded integrally with the door module 8. As shown in FIGS. 2 and 6, the fourth reinforcing structure 76 includes an opening reinforcing rib 76a formed over the entire periphery of the opening 34a of the working hole 34, and outward from the opening 34a. It is comprised by the hole part reinforcement rib 76b extended linearly, and all are integrally formed with the door module 8. FIG.

  The fourth reinforcing structure 76 adjusts the rigidity of the door module 8 so that uniform rigidity can be obtained from the hole portion 34 to the surrounding portion. That is, if a hole is formed in the door module 8, the rigidity of those parts is lowered, and a difference in rigidity from the surrounding parts occurs, resulting in non-uniform rigidity. A knot is generated or a bending vibration occurs at that portion, which is a factor that hinders the generation of 1 × 1 mode vibration. It also becomes a cause of high frequency vibration. Therefore, in the present embodiment, as the fourth reinforcing structure 76, a reinforcing portion is formed in a portion around the hole portion 34 so that the rigidity from the hole portion 34 to the surrounding portion is uniformly distributed. . The harness hole 36 is also formed with a rib similar to the opening reinforcing rib 76a (see FIG. 2). Further, the same effect can be obtained even if a reinforcing structure similar to the fourth reinforcing structure is provided in the recess such as the recess 32 for the bad member.

  Here, in the present embodiment, the thick portion 70 and the reinforcing ribs 72, 74, and 76 constituting the first to fourth reinforcing structures described above are molded according to the mold shape without depending on the core back. . Therefore, in these annular thick portions 70, the resin is not foamed, and the low frequency sound in the door closing sound increasing region 8a can be prevented from being attenuated. The door module 8 can be further reduced in weight by molding the thick portion 70 and the reinforcing ribs 72, 74, and 76 with a core back.

Next, a structure for attaching the door module 8 to the door inner panel 6 will be described with reference to FIGS. 7 is a partially enlarged plan view (a) showing an enlarged first connecting portion between the door module and the door inner panel of FIG. 2 and an enlarged plan view showing a modification of the first connecting portion (b, FIG. 8 is a cross-sectional view showing the first connecting portion between the door module and the door inner panel and the reinforcing portion for vibration isolation provided on the door inner panel as seen along line VIII-VIII in FIG. FIG. 9 is a cross-sectional view showing the structure of the door latch portion and the connecting structure of the door module, the door inner panel, and the door latch bracket as viewed along line IX-IX in FIG.
First, as shown in FIG. 2, the door module 8 is attached to the door inner panel 6 by the 1st connection part 22 and the 2nd connection part 24 along the peripheral part as mentioned above.
The first connecting portion 22 is twelve connecting portions provided along the front region 6b, the upper region 6d, and the lower region 6e of the door inner panel, and the second connecting portion 24 is located behind the door inner panel. It is six connection parts along the region 6c.

First, the first connecting portion 22 will be described with reference to FIGS. 7 and 8.
As shown in FIGS. 7A and 8, the first connecting portion 22 includes a resin grommet 80 and a resin screw grommet 82. The grommets 80 are respectively fitted and fixed in the mounting holes 6k of the door inner panel so that the heads 80a are arranged on the door module side, and the screw grommets 82 are inserted into the insertion holes 8k of the door module 8 from above. And is inserted into the head 80 a of the grommet 80 and fixed to the grommet 80.

  In this embodiment, a pedestal portion 84 is integrally formed around the screw grommet 82 of the door module 8. As shown in FIG. 8, the pedestal portion 84 is formed such that its height is larger than the height of the head of the grommet 80, and these pedestal portions 84 come into contact with the door inner panel 6. The head 80a of the grommet 80 and the door module 8 are prevented from contacting each other, and the contact area between the door inner panel 6 and the door module 8 is increased by the pedestal portion 84. In this way, the screw grommet 82 is prevented from being damaged.

  Further, as shown in FIG. 7A, the pedestal portion 84 is provided so as to extend in an arc shape at two positions symmetrically with respect to the insertion hole 8k so as to surround the insertion hole 8k, that is, the screw grommet 82. ing. As shown in FIG. 2 and FIG. 7, in this embodiment, such a pedestal portion 84 is such that the line a connecting the pedestal portions 84 extending in two places faces inward of the door module 8. The door module 8 is arranged so as to pass through substantially the center. By arranging in this way, the pedestal portion can effectively receive the vibration of the door module 8. As shown in FIG. 7 (b), the pedestal portion 84 may be formed in an annular shape, or as shown in FIG. 7 (c), the pedestal portion 84 is linear at two locations in contrast to the insertion hole 8k. You may arrange | position so that it may extend.

Next, referring to FIGS. 2 and 9, the structure of the door latch portion 16 will be described in detail, and the second connecting portion 24 will be described.
In the door structure according to the present embodiment, vibration generated mainly on the door latch portion 16 side when the door is closed is transmitted to the door module 8, and a specific low-frequency vibration among the vibrations is increased by the low-frequency sound increasing means. I have to. Therefore, in the present embodiment, the structure of the door latch portion 16 so that vibration generated mainly on the door latch portion 16 side when the door is closed is more efficiently transmitted to the door module 8, and the door module 8 and the door inner panel. 6 and the door latch portion 16 are connected.

  First, as shown in FIG. 9, the door latch bracket 18 is fixed to the rear end surface 6g and the rear region 6c of the door inner panel 6 by welding at a plurality of locations as indicated by d in FIG. Here, a door latch mechanism 20 is fixed to the door latch bracket 18 at a position as shown in FIG. The door latch bracket 18 is a portion above and below the door latch mechanism 20 where the door latch mechanism 20 is not provided, and a triangular closed section (indicated by e in FIG. 9) is formed between the door latch bracket 18 and the door inner panel 6. The shape is bent as shown.

As shown in FIGS. 2 and 9, the door latch bracket 18 extends toward the front in the front-rear direction of the vehicle body to a position overlapping the door module 8. In the six second connecting portions 24 in the door latch portion 16, the door module 8, the door inner panel 6, and the door latch bracket 18 are fastened together by bolts 90 and nuts 92, thereby connecting rigidity (the door module 8 door). The mounting rigidity to the inner panel 6 is increased. As shown in FIG. 2, these second connecting portions 24 are orthogonal to the direction from the door latch portion 16 toward the door module 8, that is, the direction in which vibration is transmitted (in this embodiment, the vehicle longitudinal direction). It is arranged so as to extend in two rows along the edge of the door module 8 on the door latch side in the direction.
In addition, as shown in FIG. 2, in the region where the second connecting portion 24 is provided, that is, in the region where the door module 8, the door inner panel 6 and the door latch bracket 18 overlap, the door latch portion 16 to the door module 8. Reinforcing ribs (reinforcing portions) 94 extending linearly in the direction toward the door module 8 are formed integrally with the door module 8.

Next, referring to FIG. 2 and FIG. 8, a description will be given of a vibration blocking reinforcing structure provided on the door inner panel 6 in order to radiate low frequency sound vibration from the door module 8 more reliably.
In the present embodiment, by providing the door inner panel 6 with a vibration blocking reinforcement structure, vibration generated mainly on the door latch portion 16 side is efficiently transmitted to the door module 8. The vibration generated on the side and the vibration transmitted to the door module 8 are made difficult to be transmitted to the door inner panel 6.
Specifically, first, as shown in FIG. 2, the door inner panel 6 is formed with a vibration shielding reinforcing portion 100 that continuously extends in a linear shape. As shown in FIG. 8, the vibration isolating reinforcing portion 100 is composed of a stepped portion 100 that is bent at two locations f and g in FIG.

Next, as shown in FIG. 2, the stepped portion 100 includes a first vibration isolation portion 100 a that continuously extends so as to surround the door module 8 in the front region 6 b, the upper region 6 d, and the lower region 6 e, and the rear region. And a second vibration isolating portion 100b formed in 6c. The second vibration isolation unit 100b continuously extends from the first vibration isolation unit 100a so that the upper region 6d and the lower region 6e are separated from the door latch unit 16 above and below the door latch unit 16, respectively. The door inner panel 6 extends to the boundary edge with the rear end face 6g.
Next, as shown in FIG. 8, the stepped portion 100 is formed at a height protruding from the door module 8 in the out-of-plane direction. By forming in this way, the vibration is further blocked and the sound radiated from the door module 8 does not escape in all directions, so that the acoustic radiation energy is further increased.

Next, the function and effect of the embodiment of the present invention will be described.
First, in the door structure of the present embodiment, the low frequency sound increasing means in the door closing sound increasing region 8a is transmitted to the door module 8 mainly on the door latch portion 16 side, that is, on the rear region 6c side of the door inner panel 6. Among the vibrations that occur when the door is closed, a specific low-frequency vibration energy that allows the occupant to feel heavy is converted into increased acoustic radiation energy. As a result, low-frequency sound radiated from the door module 8 is reduced. Can be increased. That is, when the door is closed, the door latch portion 16 side of the door inner panel 6 abuts on the vehicle body side and vibration is generated, or the door latch mechanism 20 abuts on a striker (not shown), and vibration is generated. Of these vibrations, low-frequency vibrations can be increased. Among such increased low-frequency sounds, the passengers in the vehicle can feel the door closing sound profound due to the low-frequency sound radiated to the passenger compartment. Further, the low frequency sound radiated to the passenger compartment side is attenuated by high frequency components by the door trim 10, so that the occupant in the vehicle can feel the solidity more reliably.
Of the increased low frequency sound, the low frequency sound radiated to the outside of the vehicle is radiated to the space between the door outer panel 2 (outer portion), the door inner panel 6 and the door module 8 (inner portion), and The light passes through the door outer panel 2 and is emitted to the outside of the vehicle. As a result, a passenger outside the vehicle can feel the door closing sound profound. In addition, the door closing sound transmitted through the door outer panel 2 attenuates the high frequency component, so that a passenger outside the vehicle can feel the heavyness more reliably.

  Next, in the door structure of the present embodiment, the door module 8 is divided into a door closing sound increasing region 8a in which low-frequency sound acoustic conversion efficiency is increased, and a specific door functional component support region in which vibration acoustic conversion efficiency is decreased. 8b, it is possible to increase the vibration of a specific low frequency at which the occupant can feel heavyness, while the vibration and sound generated by the specific door functional component, that is, the speaker 28 Sound generated and vibration of the motor 40 can be prevented from being radiated indoors from the door module. That is, even if the low frequency sound of the door closing sound is increased by separating the door closing sound increasing region 8a and the specific door functional component supporting region 8b, the sound and vibration of the speaker 28 and the motor 40 are not radiated. Can be made. As a result, the passenger can feel the door closing sound heavy, and the sound of the speaker 28 is radiated from only the speaker 28 and feels the sound of the speaker 28 good, or the vibration of the motor 40 It is possible to prevent unpleasant motor noise from being heard without being emitted into the room as sound.

  In particular, the door closing sound increasing region 8a is provided on the rear side of the door module 8 where the door latch portion 16 is provided. It can be directly transmitted to the door closing sound increasing region 8a without being attenuated. As a result, as described above, the low-frequency vibration can be more reliably amplified, and the occupant can feel that the door closing sound is profound. On the other hand, since the specific door functional component support region 8b is provided on the front side away from the door latch portion 16, vibration generated when the door is closed mainly on the door latch portion 16 side can be prevented from being attenuated.

Next, since the door module 8 is made of resin, its moldability is high. Therefore, the reinforcing rib 42, the thick portion 70, and the reinforcing ribs 72, 74, and 76, which are low-frequency sound increasing means, can be easily formed on the resin door module 8. As a result, low-frequency sound increasing means can be provided at low cost. Moreover, workability at the time of manufacture and attachment is not reduced.
In particular, in this embodiment, the door module 8 is formed by microcell molding, and only a part of the door module 8 is foamed by core back molding. By this foaming, the door module 8 having a light weight and high rigidity can be formed. That is, conventionally, in order to increase the rigidity of the entire door module, a large number of reinforcing portions such as ribs and beads were formed, and the volume of the resin such as the ribs increased, leading to an increase in weight. In the present embodiment, since the rigidity is increased by foaming, the rigidity of the door module 8 can be increased without increasing the weight, which can contribute to the weight reduction of the vehicle body.

  Here, in the conventional chemical foaming, the foamed cell size is large, and furthermore, a coarse gap is generated in the central portion of the plate thickness by the core back molding, but in this embodiment, the cell is formed by the micro cell molding and the core back. Fine and uniform foaming can be realized. As a result, the rigidity of the door module is increased, and the sound and vibration of the speaker 28 and the motor can be effectively attenuated by the fine and uniform foam cell. In particular, in this embodiment, since the door closing sound increasing region 8a is a non-foaming region, the low-frequency door closing sound that allows the occupant to feel the heavyness can be greatly emitted without absorbing or attenuating. On the other hand, since the specific door functional component support area 8b is a foaming area, sounds and vibrations that are not desired to be emitted from the door module 8, such as sounds and vibrations of the speaker 28 and the motor 40, can be absorbed or attenuated. .

  Next, in this embodiment, since the specific door functional component support region 8b is formed by foaming, the uniform and fine foaming can greatly increase the rigidity of the specific door functional component support region 8b. As a result, door functional components such as the speaker 28 and the motor 40 can be reliably held. Further, the rigidity of the specific door functional part support area 8b is greatly increased, so that the rigidity of the door module 8 itself can be easily increased. As a result, the rigidity is ensured even if the plate thickness of the door module 8 is made thinner than before. I can do it. Moreover, a lightweight and highly rigid structure can be formed by foaming. On the other hand, the rigidity of the door closing sound increasing region 8a is smaller than the rigidity of the specific door functional component support region 8b, and the door closing sound increasing region 8a is likely to vibrate. Therefore, as described above, the low frequency sound can be reliably increased and radiated.

  In the present embodiment, the door closing sound increasing region 8a is partitioned by the window regulator mounting reinforcing rib 42 which is a low frequency sound increasing means, and the aspect ratio is approximately 1: 1. It is possible to easily generate vibration of 1 × 1 mode that is vibration. Further, since the reinforcing rib 42 is increased in plate thickness and has increased rigidity, the vibration of the door closing sound increasing region 8a may be blocked from being transmitted to the specific door functional component support region 8b. I can do it. Furthermore, since the rigidity of the door module 8 is adjusted by the first to fourth reinforcing structures (reinforcing portions) formed on the door module 8, the door module 8 has a 1 × 1 vibration mode at a low frequency of 200 Hz or less. The low frequency sound radiated from the door module 8 can be increased.

That is, the central region of the door closing sound increasing region 8a is reinforced in an annular shape by the annular thick portion 70 which is the first reinforcing structure. As a result, it becomes easy to generate vibration of 1 × 1 mode. In other words, the annular thick portion 70 can generate a vibration antinode that has the largest amplitude in the substantially central portion of the door closing sound increasing region 8a.
Further, the linear ribs 72 as the second reinforcing structure are adjusted so that the rigidity in the longitudinal direction of the vehicle body in the door closing sound increasing region 8a is made uniform. As a result, it is possible to prevent vibration nodes from occurring in almost the entire area except the peripheral edge of the door closing sound increasing region 8a, and to easily generate 1 × 1 mode vibration. Further, the vibration has an antinode of a smooth vibration distribution (vibration amplitude distribution) over almost the entire door module 8, so that the sound radiation efficiency of low frequency sound can be improved more reliably. In particular, the linear rib 56 has a direction in which vibration generated mainly on the door latch portion 16 side or vibration generated on the rear region 6c side of the door inner panel 6 provided with the door latch portion 16 is transmitted. Since it extends in the direction from the door latch part 16 side through the substantially central part of the door module 8 toward the opposite door hinge 14 side, vibration of 1 × 1 mode can be effectively generated.

Further, since the linear rib 56 is formed integrally with the annular thick portion 50 (first reinforcing structure), the region where the plurality of annular thick portions 50 are formed integrally vibrates as vibration antinodes. Further, it is possible to prevent the occurrence of a vibration node by bending at the boundary between the outermost annular thick portion 50d and the outer portion thereof. As a result, 1 × 1 mode vibration can be reliably generated. In addition, high-frequency vibration is less likely to occur.
Further, the plurality of radial ribs 74 which are the third reinforcing structure can arrange the vibration antinode distribution so that the vibration amplitude gradually increases from the outer peripheral region of the door module 8 toward the central portion. Here, the peripheral portion of the door module 8 connected to the door inner panel 6 is likely to be a vibration node, and the outer peripheral region is a skirt portion of the vibration antinode distribution. By forming radial ribs 74 directed almost to the center of the door closing sound increasing region 8a in the outer peripheral region, the outer peripheral region is prevented from bending and causing vibration nodes. It is possible to generate 1 × 1 mode vibration with a smooth vibration distribution as a whole. Therefore, the sound radiation efficiency of low frequency sound can be improved more reliably. In addition, high-frequency vibration is less likely to occur.

  Further, the opening reinforcing rib 76 which is the fourth reinforcing structure can provide uniform rigidity from the hole or the concave portion to the surrounding portion. Therefore, it is possible to prevent vibrations from occurring in such holes and recesses, and vibrations that are bent at the boundary between the holes and recesses and the surrounding portions. That is, since the hole 34 and the concave portion 32 and the surrounding portion are easily vibrated integrally (in the same phase), the door module is likely to generate 1 × 1 mode vibration and the amplitude distribution of the antinodes of the vibration is obtained. Can be smooth. As a result, it is possible to increase the acoustic radiation efficiency of a specific low-frequency vibration. In addition, generation of high frequency vibration can be prevented.

Next, the effect of the attachment structure to the door inner panel 6 of the door module 8 by the door structure of this embodiment is demonstrated.
In the present embodiment, the door module 8 is attached to the door inner panel 6 by the resin grommets 80 and the screw grommets 82 which are the first connecting portions 22, so that the door module 8 has a simple structure and a simple process. 8 can be attached to the door inner panel 6.
Here, vibration is transmitted to the door module 8 from the door inner panel 6, but when the door module 8 vibrates, the door module 6 and the door inner panel 8 approach or move away from each other at the connecting portion at the peripheral edge. Or relative vibrations that are shifted from each other in the lateral direction (in-plane direction). In such a case, when the head of the grommet 80 and the door module 8 are connected so as to come into contact with each other, the door module 8 is supported only by the grommet 80 and the screw grommet 82, which is caused by the vibration of the door module 8. Thus, the screw grommet 82 is relatively easy to move with respect to the grommet 80 of the inner panel 6. As a result, a large load is applied to the screw grommet 82, and the screw grommet 82 is broken or bent.

  However, in this embodiment, the base part 84 formed so that the height is larger than the height of the head of the grommet 80 is integrally formed around the screw grommet 82 of the door module 8. The portion 84 comes into contact with the door inner panel 6. Therefore, the door module 8 is supported not only by the grommet 80 and the screw grommet 82 but also by the pedestal portion 84, and even if the relative vibration described above occurs, the load applied to the screw grommet 82 becomes very small. . As a result, the screw grommet 82 can be prevented from being broken or bent. Furthermore, since the mounting strength can be increased, the vibration of the door module 8 can be increased more reliably at low frequency without causing chatter vibrations, etc., and the door closing sound can be more reliably felt. It can be made.

Further, since the pedestal portion 84 is formed so as to surround the insertion hole 8k, that is, the screw grommet 82, the screw grommet 82 can be supported with a long span (distance). As a result, the load applied to the screw grommet 82 is reduced. It can be made smaller. In particular, when the relative vibration between the door module 8 and the door inner panel 6 is complex, that is, when all vibrations in the out-of-plane direction and the in-plane direction are combined, the door module 8 has the door inner. The panel 6 is mainly supported by the pedestal portion 84 and can effectively prevent the screw grommet 82 from being damaged.
Further, the line a connecting the base portions 84 extending at two places is arranged so as to face inward of the door module 8, in particular, through the substantially central portion of the door module 8. The pedestal can effectively receive the vibration. Further, the same effect can be obtained even when the line a connecting the pedestals 84 is directed to the central region of the door closing sound increasing region 8a.

Next, the structure of the door latch part 16 in the door structure of this embodiment and the effect of the 2nd connection part 24 are demonstrated.
In the present embodiment, in the second connecting portion 24, the door module 8, the door inner panel 6, and the door latch bracket 18 are fastened together by bolts 90 and nuts 92. Therefore, mainly on the door latch portion 16 side. The generated vibration can be efficiently transmitted to the door module 8. Here, the greater the vibration transmitted to the door module 8, the greater the low-frequency vibration increased by the low-frequency sound increasing means. Therefore, it is possible to more effectively increase the low frequency sound that allows the occupant to feel heavy. Moreover, since these connection parts 24 are arrange | positioned in 2 rows along the direction which goes to the door module 8 from the door latch part 16, ie, the direction where a vibration is transmitted, it transmits a vibration more efficiently. I can do it.

  Further, since a triangular closed cross section is formed between the door latch bracket 18 and the door inner panel 6, vibration generated on the side where the door latch mechanism 20 or the door latch portion 16 is provided is efficiently transmitted to the door module 8. I can do it. That is, due to the triangular cross section, the door inner panel 6 is difficult to deform when the door is closed. However, most of the energy can be efficiently transmitted to the door module 8 as vibration energy that vibrates the door module 8 in the out-of-plane direction. Further, since a reinforcing rib 86 extending in the direction from the door latch portion 16 toward the door module 8 is formed in the region where the door module 8 is fastened, vibrations generated when the door is closed mainly on the door latch portion 16 side. Can be effectively transmitted to the door module 8.

Next, in the door structure of this embodiment, the effect of the vibration shielding reinforcing portion 100 provided on the door inner panel 6 in order to radiate low frequency sound vibration from the door module 8 more reliably will be described.
In the present embodiment, the vibration isolation reinforcing portion 100 (first vibration isolation portion 100a) is formed in the regions 6b, 6d, and 6e of the door inner panel 6 so as to surround the door module 8, so The transmitted vibration is further hardly transmitted to each of the regions 6b, 6d, 6e, and as a result, it is possible to prevent the door inner panel 6 from generating high-frequency sound. That is, the door inner panel 6 is made of a steel plate, the areas of the regions 6b, 6d, and 6e are relatively small, and the outer shape thereof is particularly complex like the opening 6a. Although it is easy to generate | occur | produce, since there is little vibration transmitted from the door module 8, generation | occurrence | production of such a high frequency sound can be prevented.

  The second vibration blocking unit 100b is provided above and below the door latch unit 16 so that vibration generated mainly on the door latch unit 16 side is difficult to be transmitted to the upper region 6d and the lower region 6e of the door inner panel 6. Each extends continuously from the first vibration isolation unit 100a. Therefore, it is possible to prevent high-frequency sound from being radiated in the upper region 6d and the lower region 6e of the door inner panel 6 and further in the front region 6b continuous with the regions 6d and 6e. On the other hand, since the vibration isolating reinforcing portion 100 surrounding the door module 8 is not formed in the rear region 6c, the vibration generated mainly on the door latch portion 16 side can be efficiently transmitted to the door module 8. I can do it.

  Further, since the vibration shielding reinforcing portion 100 is a step portion 100 having high rigidity, vibration transmitted from the door module 8 to the door inner panel 6 or directly transmitted from the door latch portion 16 side to the door inner panel 6. Can effectively cut off the vibrations. Further, since the step portion 100 is formed so as to protrude in the out-of-plane direction from the door module 8, the step portion 100 is formed as a wall facing the peripheral edge of the door module 8 in the in-plane direction. The Therefore, the low frequency sound radiated from the door module 8 does not escape from the gap between the door module 8 and the door inner panel 6 so that the acoustic radiation energy radiated from the door module 8 is not reduced. I can do it. In particular, in the present embodiment, a plurality of connecting portions 22 that are spaced along the peripheral edge portion of the door module 8 are provided, and the connecting portion 22d allows displacement, so that the door module 8 vibrates. This is effective because a gap is easily formed between the door module 8 and the door inner panel 6. Even if the vibration isolating reinforcing portion 100 is similarly configured with the bead portion 94, the same effects can be obtained.

Next, the operation of the low frequency amplification by the door module 8 according to the present embodiment obtained by experiment will be described with reference to FIG. FIG. 10 is a diagram showing experimental results of the relationship between sound pressure and frequency when the door module according to the present embodiment and the door module according to the prior art are closed.
In this experiment, the door module according to the present embodiment as shown in FIGS. 1 to 9 and the door module according to the prior art are respectively manufactured and attached to the door inner panel as shown in FIG. The sound pressure of the sound radiated from the door module was measured by the generated vibration.
As shown in FIG. 10, the sound pressure of the door module according to the present embodiment is higher than that of the door module according to the prior art in the region of about 200 Hz or less, and the low frequency sound capable of giving a heavy weight to the passenger is increased. I understand that Thus, the effect of the low frequency vibration amplification by the door module by this embodiment was confirmed.

It is a disassembled perspective view which shows the basic structure of the front door to which the door structure of the motor vehicle by embodiment of this invention is applied. It is the top view seen from the compartment side which shows the structure of the door inner panel and door module by embodiment of this invention. FIG. 3 is a cross-sectional view showing a cross-sectional shape of the door module in the front-rear direction of the vehicle body taken along line III-III in FIG. 2. It is sectional drawing of the metal mold | die and resin injection | pouring apparatus for demonstrating the molding method of the door module by a microcell molding technique. FIG. 5 is a cross-sectional view of a motor housing recess as viewed along line VV in FIG. 2. It is sectional drawing which shows the 4th reinforcement structure provided in the hole for work seen along the VI-VI line of FIG. FIG. 5 is a partially enlarged plan view (a) showing an enlarged first connecting portion between the door module and the door inner panel of FIG. 2 and an enlarged plan view (b, c) showing a modification of the first connecting portion. . It is sectional drawing which shows the 1st connection part of the door module and door inner panel seen along the VIII-VIII line | wire of FIG. 2, and the reinforcement part for vibration insulation provided in the door inner panel. It is sectional drawing which shows the structure of the door latch part seen along the IX-IX line of FIG. 2, and the connection structure of a door module, a door inner panel, and a door latch bracket. It is a diagram which shows the experimental result of the relationship between the sound pressure and frequency at the time of the door closing of the door module by this embodiment, and the door module by a prior art.

Explanation of symbols

2 door outer panel 6 door inner panel 6a opening 6b-e front area, rear area, upper area, lower area of door inner panel 8 door module 8a door closing sound increase area 8b specific door functional component support area 8c boundary area 16 door latch part 18 Door Latch Bracket 20 Door Latch Mechanism 22 First Connecting Portion between Door Module and Door Inner Panel 24 Second Connecting Portion Between Door Module and Door Inner Panel 26 Window Regulator 28 Speaker 40 Motor 42 Reinforcement Rib for Window Regulator Mounting 70 Annular thick part (first reinforcing part)
72 Straight rib (second reinforcement)
74 Radial rib (3rd reinforcement part)
76 4th reinforcing part 80 Grommet 82 Screw grommet 84 Base part 100 Reinforcing part for vibration isolation (step part)

Claims (10)

A door structure of an automobile supported by a door latch so as to be freely opened and closed,
Door outer panel,
A door inner panel disposed on the vehicle compartment side of the door outer panel and provided with the door latch and having an opening formed therein;
A resin door module attached to the door inner panel so as to cover the opening of the door inner panel;
This door module is formed so as to be divided into at least a support region for supporting a door functional component that generates sound and an increase region for increasing the acoustic conversion efficiency of a specific low-frequency vibration among vibrations generated when the door is closed. And the acoustic radiation efficiency of the support area is lower than the acoustic radiation efficiency of the increased area.   The automobile door structure according to claim 1, wherein the increased area is formed on a rear side of the door module near the door latch, and the support area is formed on a front side.   The automobile door structure according to claim 1 or 2, wherein the rigidity of the support area is larger than the rigidity of the increase area.   The automobile door structure according to any one of claims 1 to 3, wherein the vibration damping capacity of the support area is larger than the damping capacity of the increased area.   The door structure for an automobile according to any one of claims 1 to 4, wherein a reinforcing portion for attaching a window regulator is formed in a boundary region between the increased region and the support region.   The door structure of a vehicle according to any one of claims 1 to 5, wherein the door function component generating the sound includes a speaker. A door structure of an automobile supported by a door latch so as to be freely opened and closed,
Door outer panel,
A door inner panel disposed on the vehicle compartment side of the door outer panel and provided with the door latch and further formed with an opening;
A resin door module attached to the door inner panel so as to cover the opening of the door inner panel;
A door structure of an automobile, wherein a vibration region having an aspect ratio of approximately 1: 1 is formed in the door module.   The automobile door structure according to claim 7, wherein the vibration region is formed on a rear side of the door module near the door latch.   The automobile door structure according to claim 7 or 8, wherein the vibration region is partitioned and formed by forming a reinforcing portion for attaching a window regulator in a boundary region with other regions.   The door module is further provided with a door functional component support region having a lower acoustic radiation efficiency than the vibration region, and a speaker is attached to the door functional component support region. Automobile door structure.

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