JP2006088995A - Door structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door structure of an automobile capable of increasing the low frequency sound to allow the driver/passenger to have the sense of profoundness while the structure remains simple so as not to ill influence the cost, weight, and the working effectiveness. <P>SOLUTION: The door structure of the automobile is arranged to be supported by a door latch 16 on the automobile body in such a way as capable of being opened and closed, and has a door inner panel 6 fitted with the door latch and provided with an opening 6a and a door module made of resin furnished with door functional component(s) 24 etc. and attached to the door inner panel in such a way as covering the opening in the door inner panel, wherein the door module is equipped with an increasing means 50 etc. to increase the acoustical conversion efficiency of the specific low frequency vibration among the door latch vibrations generated when the door is closed, and the the door inner panel is furnished with a reinforcement part 90 for shutting off the vibration formed in the regions 6b, 6d, 6e other than the region 6c on the side whereto the door latch is secured, in such a way as surrounding the door module. <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 the door, and by this sound absorbing material, vibration propagation from the outside of the vehicle to the inside of the vehicle or from the inside of the vehicle to the outside of the vehicle. 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.
In addition, a sound absorbing material such as urethane is provided inside the door to suppress the generation of high frequency sound.

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. In addition, the above-described technology for absorbing high-frequency sound such as urethane can absorb high-frequency sound, but cannot increase low-frequency sound.
On the other hand, in recent years, not only the car body but also the door structure has been demanded to reduce cost, reduce weight, and improve workability at the time of manufacture. Therefore, it has a simple structure that does not adversely affect cost, weight, and workability. A door structure that can increase low-frequency sound is desired.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and the passenger may feel heavy with a simple structure that does not adversely affect cost, weight, and workability. It aims at providing the door structure of the motor vehicle which can increase the low frequency sound which can be performed.

In order to achieve the above object, the present invention provides a door structure for an automobile that is supported on a vehicle body by a door latch so as to be freely opened and closed. The door module further includes a door inner panel in which an opening is formed, and a resin door module provided with a door functional part and attached to the door inner panel so as to cover the opening of the door inner panel. Includes an increasing means for increasing the acoustic conversion efficiency of a specific low-frequency vibration of the door latch generated when the door is closed, and the door inner panel has a region other than the region where the door latch is fixed. Further, it is characterized in that a vibration blocking reinforcing portion formed so as to surround the door module is provided.
In the present invention configured as described above, the door module is provided with an increasing means for increasing the acoustic conversion efficiency of a specific low-frequency vibration among the vibrations of the door latch generated when the door is closed. Among the vibrations of the door latch, the specific low-frequency vibration energy that allows the occupant to feel heavy is converted into increased acoustic radiation energy. As a result, the low frequency sound radiated from the door module can be increased, and the passenger can feel the door closing sound heavy. Further, the increased low frequency sound is radiated to the space between the door outer panel, the door inner panel, and the door module, and further radiated 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.
Further, since the increasing means is provided in the resin door module having high moldability, it is possible to obtain a door structure capable of increasing the low frequency sound without adversely affecting the cost, weight and workability.
Further, since the vibration blocking reinforcing portion is formed so as to surround the door module in the other area except the area where the door latch is fixed, the vibration transmitted from the door latch to the door module is the door inner panel. Can be made difficult to be transmitted to other areas except the area where the door latch is fixed. As a result, certain low frequency vibrations are more efficiently converted into acoustic energy at the door module. In addition, since vibration transmitted from the door latch to the door module is less likely to be transmitted to the door inner panel, it is possible to prevent, for example, high-frequency sound from being emitted due to the shape of the door inner panel. Furthermore, since the door inner panel is reinforced by the vibration shielding reinforcing portion, the door inner panel is less likely to vibrate, and the generation of high-frequency sound is suppressed. As a result, it is possible to make the occupant feel the door closing sound more profoundly.

In the present invention, preferably, the vibration blocking reinforcing portion of the door inner panel continuously extends to a region of the door inner panel where the door latch is fixed and extends above and below the door latch.
In the present invention configured as described above, the door latch extends continuously above and below the door latch to the region where the door latch is fixed. Therefore, even if the door latch is fixed to the door inner panel, the door latch This vibration can be made difficult to be transmitted to other areas except the side where the door latch of the door inner panel is fixed. As a result, the vibration of the door latch is greater and is transmitted to the door module and is more efficiently converted into acoustic energy by the door module. In addition, since vibration of the door latch is hardly transmitted to the door inner panel, it is possible to prevent, for example, high-frequency sound from being emitted due to the shape of the door inner panel. Furthermore, since the door inner panel is reinforced by the vibration shielding reinforcing portion, the door inner panel is less likely to vibrate, and the generation of high-frequency sound is suppressed. As a result, it is possible to make the occupant feel the door closing sound more profoundly.

In the present invention, it is preferable that the vibration blocking reinforcing portion is a stepped portion or a bead portion formed so as to protrude outward from the door module.
In the present invention configured as described above, the stepped portion or the bead portion that is the reinforcing portion for vibration isolation is formed so as to protrude in the out-of-plane direction from the door module, and is thus emitted from the door module. The low frequency sound can be prevented from escaping from the gap between the door module and the door inner panel, and the acoustic radiation energy radiated from the door module can be prevented from being reduced. As a result, it is possible to make the occupant feel the heavyness more reliably.

In the present invention, it is preferable that the door module is formed in a quadrangular shape having a long side and a short side, and is attached to the door inner panel at a plurality of connecting portions along a peripheral portion thereof. Among them, all or some of the plurality of connecting portions arranged in the long side direction of the door module are weakly connected so as to allow displacement of the door module with respect to the door inner panel than the plurality of connecting portions arranged in the short side direction. Yes.
In the present invention configured as described above, all or some of the plurality of connecting portions arranged in the long side direction of the door module are displaced relative to the door inner panel of the door module rather than the plurality of connecting portions arranged in the short side direction. Therefore, it is possible to prevent low-frequency vibration in which antinodes of vibration are distributed in the long side direction of the door module. Here, since the long side direction has a longer distance than the short side direction, vibrations having a large wavelength and a large vibration amplitude are likely to be distributed along the long side direction. Therefore, by allowing the displacement of the door module with respect to the door inner panel, it is possible to increase the low frequency sound that allows the occupant to feel the heavyness more reliably.

In the present invention, it is preferable that the door module is attached to the door inner panel at a plurality of connecting portions along a peripheral edge portion thereof, and the side of the plurality of connecting portions opposite to the side on which the door latch is fixed. All or some of the plurality of connecting portions arranged in the direction toward the door allow displacement of the door module with respect to the door inner panel rather than the plurality of connecting portions arranged along the side on which the door latch is fixed and the opposite side. So weakly connected.
In the present invention configured as described above, all or a part of the plurality of connecting portions arranged in the direction from the side on which the door latch is fixed to the opposite side thereof are arranged on the side on which the door latch is fixed and on the opposite side. Since the door module is weakly connected to allow displacement relative to the door inner panel than the multiple connecting parts arranged along the side, the vibration belly is distributed from the side where the door latch is fixed to the opposite side. It is possible not to suppress low frequency vibrations. Here, since the vibration generated in the door latch is transmitted from the side on which the door latch is fixed to the opposite side, vibration having a large wavelength and a large vibration amplitude is likely to be distributed along the direction. . Therefore, by allowing the displacement of the door module with respect to the door inner panel, it is possible to increase the low frequency sound that allows the occupant to feel the heavyness more reliably.

In the present invention, it is preferable that the connection portion weakly connected so as to allow displacement includes an elastic body, and the door module is attached to the door inner panel via the elastic body.
In the present invention configured as described above, since the door module is attached to the door inner panel via an elastic body, displacement of the door module with respect to the door inner panel can be effectively allowed.

In the present invention, it is preferable that the increasing means is configured such that a reinforcing portion for adjusting the rigidity of the door module is formed integrally with the door module so that a 1 × 1 vibration mode is generated in the door module.
In the present invention configured as described above, the rigidity is adjusted so that a 1 × 1 vibration mode is generated by the reinforcing portion, so that the acoustic radiation efficiency of a specific low-frequency vibration can be more reliably increased. I can do it.

  According to the door structure of the automobile according to the present invention, it is possible to increase the low-frequency sound that allows the occupant to feel heavy with a simple structure that does not adversely affect the cost, weight, and workability.

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. Further, a side impact bar 12 is attached to the door outer panel 2 to protect the occupant during a side collision.
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 its peripheral edge is connected to the inner edge along the opening 6 a of the door inner panel 6. As shown in FIG. 1, each region 6 b to e of the door inner panel 6 is formed with a plurality of bolt through holes 6 k for attaching the door module 8 along the opening 6 a, and the peripheral portion of the door module 8. In addition, a plurality of bolt through holes 8k are formed at positions corresponding to these holes 6h. As shown in FIG. 2, the door module 8 is attached to the door inner panel 6 by a plurality of connecting portions 22 by bolts 80 and nuts 82 (see FIG. 8) passing through these bolt through holes 6k, 8k. ing.

As shown in FIG. 1, the door module 8 includes door regulator components such as a window regulator 24, a speaker 34, a side impact bad member (impact absorbing member) 36, and harnesses for supplying electricity to each door functional component ( Cables (not shown) connected to the door latch mechanism 20 are attached. In FIG. 2, the speaker 34 and the side collision pad member 36 are not shown.
Further, the door module is formed with a motor accommodating recess 40 protruding toward the vehicle compartment and a bad member recess 42 in which the side impacting bad member 36 is accommodated and fixed. Here, as shown in FIG. 2, the window regulator 24 includes a rail portion 28 that guides the window glass 26, two brackets 30 a and 30 b, and a motor 32 that raises and lowers the window glass 26. The motor 32 is accommodated in the motor accommodating recess 40.
Further, as shown in FIG. 1, the door module 8 is formed with a work hole 44, a speaker hole 46, and a harness hole 48 through which the harnesses and cables described above are passed. The work hole 44 is for connecting a door handle (not shown) attached to the door outer panel 2 and cables, and for performing other work. After the completion of these operations, a side-impact pad member (not shown) similar to that fixed to the recess 42 is attached to the hole 44.

Next, in the door structure according to the embodiment of the present invention, the door module 8 is provided with low-frequency sound increasing means to increase the low-frequency sound that allows the passenger to feel heavy when the door is closed. .
Here, the low frequency sound increasing means will be described. First, when the door is closed, vibration is generated in the door latch mechanism 20. This vibration is transmitted to the door inner panel 6 and further to the door module 8. As described above, the door module 8 is provided with various door function parts (24, 34), or formed with recesses (40, 42) or holes (44, 46, 48). And its shape and structure are 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.
In the embodiment of the present invention, a 1 × 1 low-order vibration mode is generated in order to increase the acoustic conversion efficiency. Further, in the embodiment of the present invention, as a specific low frequency vibration, a low frequency vibration of 200 Hz or less, in particular, a vibration of a frequency of 10 to 100 Hz, which allows the occupant to feel the heavyness more surely. The conversion efficiency is increased. That is, in this embodiment, the rigidity of the door module 8 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.
In addition, the shape and structure of the door module 8 are complicated, and the entire door module 8 may not vibrate completely in the 1 × 1 mode. Here, the vibration of the 1 × 1 mode is one large antinode of the door module 8, and a part of the door module 8 has a phase opposite to the antinode of the vibration. If there is little influence on the acoustic conversion efficiency even if an anti-vibration occurs, 1 × 1 mode vibration can be generated. If low-frequency sound that allows the passenger to feel heavy is generated, a low-frequency mode such as a 2 × 1 mode or a 2 × 2 mode may be generated.

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 first reinforcing structure and the fourth reinforcing structure provided in the hole for harness as seen along the line III-III in FIG. 2, and FIG. 4 is the IV-IV line in FIG. It is sectional drawing (b) of the 2nd reinforcement structure seen along the bb line of the sectional view (a) and its sectional drawing (a) showing the 1st reinforcement structure and the 2nd reinforcement structure seen along 5 is a cross-sectional view showing a fourth reinforcing structure provided in the working hole portion taken along the line VV in FIG. 2, and FIG. 6 shows the speaker seen along the line VI-VI in FIG. FIG. 7 is a cross-sectional view showing a fourth reinforcing structure provided in the motor accommodating recess as seen along line VII-VII in FIG. 2. .
First, the first reinforcing structure (first reinforcing portion) constituting the low-frequency sound increasing means will be described with reference to FIGS.
As shown in FIG. 2, the door module 8 is formed with a first reinforcing structure (first reinforcing portion) 50 constituting a low-frequency sound increasing means in the central region. The first reinforcing structure 50 adjusts the rigidity of the central region of the door module 8. The first thick reinforcing structure 50 is positioned substantially in the center of the door module 8 and has an annular thick portion 50 a extending in an annular shape, and the substantially central portion of the door module 8. Is formed of a plurality of annular thick portions 50b to 50d that extend in a ring shape and concentrically. Here, the substantially central portion refers to a substantially middle portion of the door module 8 in the vehicle longitudinal direction and substantially in the vehicle vertical direction.

  As shown in FIG. 3, these annular thick portions 50 a to 50 d are formed integrally with the door module 8. Of these annular thick portions 50, the thick portion 50a located substantially at the center of the door module 8 has a substantially trapezoidal cross section and a height higher than that of the other thick portions 50b to 50d. It is formed to be large. The other thick portions 50b to 50d are formed in an arc shape in cross section. A bracket 30b of the window regulator 24 described later is attached to the thick portion 50a, and a harness hole portion 48 is formed between the thick portion 50c and the thick portion 50d. Of these thick portions 50, the thick portion 50 formed in the motor accommodating recess 40 is formed so as to get over the recess along the protruding shape of the recess (see FIG. 1).

Next, the second reinforcing structure (second reinforcing portion) constituting the low-frequency sound increasing means will be described with reference to FIGS.
First, as shown in FIG. 2, the door module 8 is formed with a second reinforcing structure (second reinforcing portion) 56 that constitutes a low-frequency sound increasing means. The second reinforcing structure 56 is for adjusting the rigidity of the entire door module 8 in the longitudinal direction of the vehicle body. The second reinforcing structure 56 passes from the door latch part 16 side of the door module 8 through the substantially central part of the door module 8 to the door hinge 14 side. It consists of linear ribs 56 extending linearly in the longitudinal direction of the vehicle body. As shown in FIG. 4A, the linear rib 56 is molded integrally with the door module 8 and is molded integrally with the plurality of thick portions 50a to 50d as the first reinforcing structure. . As shown in FIG. 4B, the straight rib 56 has a rectangular cross section.

Next, the third reinforcing structure (third reinforcing portion) constituting the low-frequency sound increasing means will be described with reference to FIG.
First, as shown in FIG. 2, the door module 8 is formed with a third reinforcing structure (third reinforcing portion) 60 that constitutes a low-frequency sound increasing means in the outer peripheral region thereof. The third reinforcing structure 60 adjusts the rigidity of the outer peripheral region of the door module 8 and is formed so as to extend radially toward the substantially central portion of the door module 8 over substantially the entire periphery of the outer peripheral region. It consists of a plurality of radial ribs 60. 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.
These radial ribs 60 are formed integrally with the door module 8, and the cross section thereof is formed in a rectangular shape in the same manner as the linear rib 56 (see FIG. 4B) described above. Of these radial ribs 60, the radial rib 60 formed in the recess 42 for the bad member extends in a curved manner along the protruding shape inside the recess 34.

In these radial ribs 60, the spacing between adjacent reinforcing ribs and the width, height, and length of each reinforcing rib are adjusted.
Specifically, first, the interval between the reinforcing ribs adjacent to each other is formed to be irregular over the entire circumference of the outer peripheral region. Specifically, in the outer peripheral area of the door module 8, the distance between the radial ribs 60 formed on the door latch portion 16 side and the door hinge 14 side (for example, a in FIG. 2) is the other side, that is, the upper side. It is formed so as to be relatively smaller than the interval (for example, b in FIG. 2) of the radial ribs 60 formed on the side and the lower side (each side extending from the door latch portion 16 side to the door hinge 14 side). .

Next, the width and / or height thereof are adjusted so that the rigidity of the outer peripheral region provided with these radial ribs 60 is distributed substantially uniformly. Specifically, when the interval between the reinforcing ribs adjacent to each other is large, the radial rib 60 is formed so that the width thereof is larger than that of the other reinforcing ribs (for example, 60a), or the height thereof is It is formed to be larger than other reinforcing ribs (for example, 60b). Further, the width or height of the door module 8 is adjusted so that the mass per unit area is distributed almost uniformly in the outer peripheral region of the door module 8.
Next, the length of the radial ribs 60 (for example, 60c) formed on the door latch portion 16 side and the door hinge 14 side in the outer peripheral region of the door module 8 is the other side, that is, the upper side and Compared to the radial ribs 60 (for example, 60d) formed on the lower side, the ribs are formed to be relatively long.

Next, a fourth reinforcing structure (fourth reinforcing portion) constituting the low-frequency sound increasing means will be described with reference to FIGS. 2, 3, 5 to 7.
First, as shown in FIG. 2, the fourth reinforcing structure (fourth reinforcing portion) 70 constituting the low-frequency sound increasing means is a hole through which the working hole 44, speaker hole 46, harnesses and the like are passed. It is formed in the part 48 and the recessed part 40 for motor accommodation. The fourth reinforcing structure 70 adjusts the rigidity of the door module 8 so that uniform rigidity can be obtained from the hole portions 44, 46, and 48 and the concave portion 40 to the surrounding portions. That is, if a hole or a recess is formed in the door module 8, the rigidity of those parts is reduced, and a difference in rigidity from the surrounding parts occurs, resulting in non-uniform rigidity. A vibration node is generated, or a vibration that bends at that portion is generated, 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 70, the hole portions 44, 46, 48 and the concave portions are formed in the hole portions 44, 46, 48 and the concave portion 40 or by forming a reinforcing portion over the peripheral portion thereof. The rigidity from 40 to the surrounding area is uniformly distributed.

First, the fourth reinforcing structure 70 of the work hole 44 will be described with reference to FIGS. 2 and 5. The working hole 44 includes an opening 44a and a stepped-up portion 44b formed so as to protrude toward the passenger compartment. The fourth reinforcing structure 70 of the working hole 44 includes an opening reinforcing rib 72 formed over the entire circumference of the periphery of the opening 44a, and a hole reinforcing rib 74 extending linearly outward from the stepped portion. All are formed integrally with the door module 8.
As shown in FIG. 5, the opening reinforcing rib 72 has a rectangular cross section, and the height thereof is increased as the opening area increases. Here, as will be described later, a similar opening reinforcing rib 72 is also formed in the speaker hole 46 (see FIG. 6). As shown in FIG. 2, the opening 44 a of the working hole 44 is smaller than the opening 46 a of the speaker hole 46, and therefore the height of the opening reinforcing rib 72 of the working hole 44 is set to be the speaker hole 46. It is smaller than the opening reinforcing rib 72.

  The hole reinforcing rib 74 is formed in a rectangular cross section like the opening reinforcing rib 72, and the height thereof is formed so as to be higher as the distance from the vibration neutral surface is smaller. Specifically, in the present embodiment, the plane indicated by the alternate long and short dash line c in the figure is a vibration neutral plane. The raised portion 44b coincides with the vibration neutral surface c, and the base portion 8a of the door module 8 other than that is separated from the vibration neutral surface by a certain distance. Accordingly, the hole reinforcing rib 74 is formed in the vicinity of the portion where the hole reinforcing rib 74 is connected to the stepped portion 44b so that the height of the hole reinforcing rib 74 becomes higher as it is closer to the stepped portion 44b. The part has a certain height.

Next, the fourth reinforcing structure 70 of the speaker hole 46 will be described with reference to FIGS. 2 and 6. The speaker hole 46 includes an opening 46a and a stepped-up portion 46b. The fourth reinforcing structure 70 of the speaker hole 46 includes an opening reinforcing rib 72 formed integrally with the door module 8, and the opening reinforcing rib 72 has a rectangular cross section. As described above, the height is larger than the opening reinforcing rib 72 of the working hole 44.
Next, the fourth reinforcing structure 70 of the harness hole 48 through which harnesses and the like are passed will be described with reference to FIGS. 2 and 3. The fourth reinforcing structure 70 is configured by an opening reinforcing rib 72 formed over the entire circumference of the periphery of the opening 48a of the hole 48, and the height of the fourth reinforcing structure 70 is small because the opening 48a is small. And it is formed so that it may become small compared with each opening reinforcement rib 72 of the hole 46 for speakers.

Next, the fourth reinforcing structure 70 of the motor accommodating recess 40 will be described with reference to FIGS. 2 and 7. The motor accommodating recess 40 has a rectangular cross section and protrudes toward the vehicle compartment side, and the motor 32 is accommodated inside the recess, that is, on the vehicle outer side (door outer panel 2 side). The fourth reinforcing structure 70 of the motor accommodating recess 40 includes a recess reinforcing rib 76a that extends linearly in the recess 40 and a recess reinforcing rib 76b that extends linearly outward from the recess 40. The rib 76 is formed integrally with the door module 8.
The recessed portion reinforcing ribs 76 are formed in a rectangular cross section like the opening reinforcing ribs 72 and the hole reinforcing ribs 74 described above (see FIGS. 5 and 6). The height is set according to the position of the vibration neutral surface, like the hole reinforcing rib 74 of the working hole 44 described above.

Next, referring to FIG. 2 to FIG. 4, the mounting structure of the window regulator 24 constituting the low frequency sound increasing means will be described.
First, as shown in FIG. 2, the window regulator 24 includes a rail portion 28, two brackets 30 a and 30 b, and a motor 32, and is unitized. Specifically, the motor 32 is fixed to the rail portion 28 and is supported by the rail portion 28. Each bracket 30a, 30b is fixed to the rail portion 28 and extends in a direction substantially perpendicular to the longitudinal direction of the rail portion 28. This window regulator 24 is attached to the door module 8 by bolts and nuts (including 33a and 33b) at the upper and lower ends of the rail portion 28 and at the tip of each bracket 30. (See FIGS. 3 and 4).

Next, the attachment structure of the upper end part and lower end part of the rail part 28 and the front-end | tip part of the bracket 30a among these attachment parts is demonstrated.
The window regulator 24 is attached to a portion where the vibration amplitude of the vibration generated in the door module 8 is small so as not to suppress vibration generated in the door module 8, particularly vibration in the 1 × 1 mode. Specifically, the rail portion 28 extends over substantially the entire length of the opening 6a of the door inner panel 6 in the vertical direction, and the upper end portion and the lower end portion thereof are peripheral portions of the door module 8 (the door inner panel 6 of the door module 8). It is attached in the vicinity of the attachment part). Further, the bracket 30 a extends to the vicinity of the peripheral edge portion of the door module 8, and the tip portion thereof is attached to the door module 8. In addition, the connection part 22 is provided and you may attach to the peripheral part of the door module 8 used as the node of a vibration. In addition, when generating the vibration of 2x1 mode or 2x2 mode in the door module 8, such a bracket is attached to the location used as the node of the vibration of 2x1 mode or 2x2 mode, As will be described later, it is preferable to attach the bracket so that the weight of the door functional part is heavy at the place where the vibration is caused.

  The window regulator 24 is provided so as to extend around the work hole 44. That is, a part of the rail portion 28 and the bracket 30a extend so as to surround the work hole portion 44, and the upper end portion of the rail portion 28 and the tip portion of the bracket 30 are respectively attached to the work hole portion 44 by the attachment portion 33a. It is attached to the door module 8 in the vicinity. With such a structure, part of the rail portion 28 and the bracket 30 also serve as a reinforcing member for the working hole 44. That is, in the present embodiment, as described above, the working hole 44 having non-uniform rigidity in the door module 8 is reinforced by the fourth reinforcing structure 70, and the mounting position 33a of the window regulator 24 and the window The shape of the rail portion 28 and the bracket 30 of the regulator 24 reinforces the working hole 44 so that the rigidity is uniformly distributed.

Next, the attachment structure of the front-end | tip part of the bracket 30b is demonstrated.
Here, in the present embodiment, the door module 8 is caused to vibrate in 1 × 1 mode. In this case, the greater the weight of the substantially central portion of the door module 8, the more the central portion becomes the antinode of vibration. 1 × 1 mode vibration is likely to occur and the amplitude tends to increase. On the other hand, the weight of the window regulator 24 is the largest among the door functional parts attached to the door module 8 due to the weight of the motor 32, the window glass 26, and the like.
Therefore, in the present embodiment, as shown in FIG. 2, the bracket 30 b is formed to extend to almost the center of the door module 8 so that the weight of the window regulator 24 is greatly applied to the substantially center of the door module 8. The front end portion is attached to the substantially central portion of the door module 8, specifically, the annular thick portion 50a by the attachment portion 33b (see FIGS. 3 and 4). In particular, since the motor 32 is attached to the rail portion 28 at a position close to the bracket 30b, the weight of the motor 32 is largely applied to the substantially central portion of the door module 8. Further, the weight of the thick portion 50a itself is also increased by adjusting the height and diameter thereof. In the case where the annular thick portion 50 a located substantially at the center of the plurality of annular thick portions 50 is not formed, the bracket 30 b may be attached to the linear rib 56.

Next, referring to FIG. 2 and FIG. 6, a structure for attaching the speaker 34 to the speaker hole 46, which constitutes the low-frequency sound increasing means, will be described.
As shown in FIGS. 2 and 6, bolt through holes 46 c are formed in two places on the upper surface portion of the stepped-up portion 46 a of the speaker hole 46. As shown in FIG. 2, these bolt through holes 46 c are perpendicular to the direction toward the center of the door module 8 (radial direction with respect to the center) (the direction of the VI-VI line in FIG. 2). Alternatively, the speaker 34 is formed at positions substantially aligned in the circumferential direction with respect to the central portion, and the speaker 34 is attached by bolts and nuts (not shown) at these positions.
Here, the speaker 34 itself has high rigidity, and when there are a plurality of attachment positions to the door module 8, the rigidity is increased on a line connecting the attachment positions. On the other hand, when 1 × 1 mode vibration occurs in the door module 8, the vibration amplitude is distributed so that the amplitude value increases from the outer peripheral region to the substantially central region of the door module 8.
Therefore, in the present embodiment, a low frequency generated in the door module 8 by attaching a speaker at a position substantially aligned in a direction orthogonal to the direction toward the substantially central portion of the door module 8, that is, on a line having substantially the same vibration amplitude. Vibrations, particularly 1 × 1 mode vibrations are not suppressed.

Next, a structure for attaching the door module 8 to the door inner panel 6 will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing a connection portion between the door module and the door inner panel and a vibration shielding reinforcing portion provided on the door inner panel as seen along line VIII-VIII in FIG.
First, as shown in FIG. 2, the door module 8 is attached to the door inner panel 6 by the some connection part 22 along the peripheral part as mentioned above.
Among these connecting portions 22, eight connecting portions 22 arranged on the door latch side (the rear edge portion of the door module 8) and five connecting portions 22 arranged on the opposite side (the front edge portion of the door module 8) have bolts 80. And a nut 82 (see FIG. 9).

On the other hand, at the upper end portion and the lower end portion of the door module 8, each of the connecting portions 22 arranged in the direction (long side direction) from the door latch side toward the opposite side is arranged near the middle of the vehicle body front-rear direction. The two connecting portions 22a are weaker than the connecting portions 22 arranged in the vertical direction (short side direction) on the door latch side and the opposite side. Specifically, as shown in FIG. 8, these connecting portions 22 a are provided with an elastic body 84 (for example, a rubber member) between the door module 8 and the door inner panel 6, and the elastic body 84 is interposed therebetween. The door module 8 is connected to the door inner panel 6 by bolts 80 and nuts 82.
Thus, these connecting portions 22 a are connected weaker than the other connecting portions 22, and allow the displacement of the door module 8 relative to the door inner panel 6 by the elastic body 84 to be generated in the door module 8. Low frequency vibrations, particularly 1 × 1 mode vibrations are not suppressed. In addition, you may make it provide the elastic body 84 in all the connection parts 22 located in a direction which goes to the opposite side from the door latch side.

Next, the structure of the door latch part 16 and the connection structure of the door module 8, the door inner panel 6, and the door latch part 16 will be described with reference to FIGS. 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-IV in FIG.
In the door structure according to the present embodiment, the vibration generated in the door latch mechanism 20 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. Therefore, in the present embodiment, the structure of the door latch portion 16 that allows vibration generated in the door latch mechanism 20 when the door is closed to be more efficiently transmitted to the door module 8, and the door module 8, the door inner panel 6, and the door latch portion. 16 is 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. 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 connecting portions 22b 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 80 and nuts 82, and the other connecting portions 22 except the connecting portion 22b. The connection rigidity (attachment rigidity of the door module 8 to the door inner panel 6) is increased. As shown in FIG. 2, these connecting portions 22b extend along a direction from the door latch portion 16 toward the door module 8, that is, a direction intersecting with a direction in which vibration is transmitted (vehicle longitudinal direction in the present embodiment) ( It is arranged to extend in two rows (along the edge of the door module 8 on the door latch side).
Further, in a region where the connecting portion 22b is provided, that is, a region where the door module 8, the door inner panel 6 and the door latch bracket 18 overlap, a reinforcing rib extending linearly in the direction from the door latch portion 16 toward the door module 8. (Reinforcing portion) 86 is formed integrally with 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 in the door latch mechanism 20 is efficiently transmitted to the door module 8, while vibration generated in the door latch mechanism 20 and the door module 8 are transmitted. The transmitted vibration is 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 90 that continuously extends in a linear shape. As shown in FIG. 8, the vibration shielding reinforcing portion 90 includes a stepped portion 92 that is bent at two locations f and g in FIG.
Next, as shown in FIG. 2, the stepped portion 92 includes a door module 8 in the front region 6 b, the upper region 6 d, and the lower region 6 e excluding the surface on which the door latch portion 16 is provided, that is, the rear region 6 c. The first vibration isolating portion 92a continuously extending so as to surround and the second vibration isolating portion 92b formed in the rear region 6c. The second vibration blocking portion 92b extends continuously from the first vibration blocking portion 92a so that the upper region 6d and the lower region 6e are separated from the door latch portion 16 above and below the door latch portion 16, respectively. The door inner panel 6 extends to the boundary edge with the rear end face 6g. A stepped portion that extends continuously from the second vibration blocking portion 92b may also be formed on the rear end surface 6g of the door inner panel 6.

  Next, as shown in FIG. 8, the stepped portion 92 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. Note that, as shown in FIG. 10, the vibration blocking reinforcing portion 90 may be formed of a bead portion 94. Similar to the step portion 92 described above, the bead portion 94 is also preferably formed to have a height so as to block vibration and to protrude from the door module 8 in the out-of-plane direction.

Next, main effects of the embodiment of the present invention will be described.
In the door structure of the present embodiment, among the vibrations of the door latch mechanism 20 that are transmitted to the door module 8 by the low-frequency sound increasing means and that occur when the door is closed, the specific low-frequency vibration that allows the occupant to feel heavy. The energy is converted into increased acoustic radiant energy, so that the low frequency sound emitted from the door module 8 can be increased.
Of the increased low frequency sound, the low frequency sound radiated to the passenger compartment side allows the passenger in the vehicle to feel the door closing sound profound. 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, the effect of this embodiment is demonstrated concretely.
First, in the present embodiment, since the rigidity of the door module 8 is adjusted by the first to fourth reinforcing structures (reinforcing portions) formed in the door module 8, the door module 8 has a low frequency of 200 Hz or less. The low frequency sound radiated from the door module 8 can be increased by generating vibration in the vibration mode of x1.
First, the first reinforcing structure is an annular thick portion 50 that is an annular reinforcing portion that extends in an annular shape with the substantially central portion of the door module 8 as the center, and the annular thick portion 50 allows a central region of the door module 8 to be formed. Reinforced in an annular shape. As a result, it becomes easy to generate vibration of 1 × 1 mode. That is, the annular thick portion 50 can generate an antinode of vibration that has the largest amplitude at the substantially central portion of the door module 8. Further, since a plurality of the annular thick portions 50 are formed concentrically, it is possible to generate 1 × 1 mode vibration more reliably. Furthermore, high-frequency vibration is less likely to occur.

Next, the second reinforcing structure is a linear rib 56 extending from the door latch portion 16 side of the door module 8 to the opposite door hinge 14 side through the substantially central portion of the door module 8. The overall rigidity of the door module 8 in the longitudinal direction of the vehicle body is adjusted to be uniform. As a result, it is possible to prevent the occurrence of vibration nodes in almost the entire area except the peripheral edge of the door module 8, and to easily generate 1 × 1 mode vibration. Further, the vibration can have an antinode of a smooth vibration distribution (vibration amplitude distribution) over almost the entire door module 8. Such a smooth vibration distribution can improve the sound radiation efficiency of low-frequency sound more reliably.
In particular, the linear rib 56 extends in a direction in which vibration generated in the door latch mechanism 20 is transmitted, that is, in a direction from the door latch portion 16 side through the substantially central portion of the door module 8 toward the opposite door hinge 14 side. Therefore, 1 × 1 mode vibration can be generated effectively.
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.

  Next, the third reinforcing structure is a plurality of radial ribs 60 extending radially in the direction toward the substantially central portion of the door module 8 over the outer peripheral region of the door module 8. The distribution of vibration antinodes can be adjusted so that the vibration amplitude gradually increases from the outer peripheral region to substantially the center. 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 the radial ribs 60 toward the substantially central portion of the door module 8 in the outer peripheral region, it is possible to prevent the occurrence of vibration nodes by bending in the outer peripheral region. The vibration of × 1 mode can be generated with a smooth vibration distribution. 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, since the plurality of radial ribs 60 are formed at positions where the interval between the adjacent radial ribs 60 becomes irregular, it is possible to generate specific high-frequency vibrations due to the arrangement at regular intervals. Can be prevented. In particular, it is possible to prevent the occurrence of vibrations in the middle mode of several hundred Hz (for example, 300 Hz).
In addition, the width and / or height of the plurality of radial ribs 60 are adjusted so that the rigidity distribution in the outer peripheral region of the door module 8 is substantially uniform. Further, the width and / or height is adjusted so that the mass per unit area of the outer peripheral region of the door module 8 is distributed substantially uniformly. Therefore, the vibration distribution of the 1 × 1 mode generated in the door module 8 can be made smooth. Therefore, the acoustic radiation efficiency of low frequency sound is improved. Further, even if the plurality of radial ribs 60 are formed at irregular intervals, 1 × 1 mode vibration can be reliably generated.

  Further, the radial rib 60 formed on the side where the door latch portion 16 is provided in the outer peripheral region and the side where the door hinge 14 on the opposite side is provided is more like the radial rib 60 formed on the other side of the outer peripheral region. long. Therefore, it is possible to prevent the occurrence of torsional vibration, particularly on the side where the door latch portion 16 of the door module 8 is provided and the side where the door hinge 14 on the opposite side is provided. As a result, the vibration generated in the door latch mechanism 20 is efficiently transmitted in the direction from the door latch portion 16 side to the opposite door hinge 14 side, and the 1 × 1 mode vibration can be effectively generated. Further, since the door module 8 is long in the longitudinal direction of the vehicle body, by forming the radial rib 60 facing in the longitudinal direction of the vehicle body in this way, vibration in the 1 × 1 mode is more reliably generated in almost the entire door module 8. You can do that.

In particular, as described above, on the side where the door latch portion 16 is provided and the side where the door hinge 14 on the opposite side is provided, the door module 8 is more firmly connected to the door inner panel 6 than the other portions. Accordingly, the radial ribs 60 in the vicinity of these connecting portions 22 are formed long to increase the rigidity, thereby balancing the overall rigidity of the door module 8. Therefore, 1 × 1 mode vibration with a smooth vibration distribution can be generated from the side where the door latch portion 16 of the door module 8 is provided to the opposite side.
On the other hand, the connecting portions 22d aligned in the longitudinal direction of the vehicle body on the upper end side and the lower end side are weakly connected so as to allow displacement, and accordingly, the radial ribs 60 in the vicinity of these connecting portions 22d are formed short. Yes. Accordingly, it is possible to prevent the 1 × 1 mode vibration of the door module 8 from being suppressed by preventing the rigidity of the portion in the vicinity of the connecting portion 22d from greatly increasing.

Next, the fourth reinforcing structure 70 is an opening reinforcing rib 72, a hole reinforcing rib 74, and a concave reinforcing rib 76 that reinforce the holes 44, 46, 48 and the concave portion 40 formed in the door module 8. With each rib, uniform rigidity can be obtained from the hole or recess to the surrounding portion. Therefore, it is possible to prevent vibrations from occurring in the holes 44, 46, 48 and the recess 40, or to generate vibrations such as bending at the boundary between the hole or recess and the surrounding portion. I can do it. That is, since the holes 44, 46, 48 and the concave portion 40 and the surrounding portion are easy to vibrate integrally (in the same phase), the door module is liable to generate 1 × 1 mode vibration and the vibration antinodes. The amplitude distribution can be made 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.
Further, the height of the hole reinforcing rib 74 and the concave reinforcing rib 76 is formed so as to increase as the distance from the vibration neutral surface decreases, and the height of the opening reinforcing rib 72 increases as the size of the opening increases. Since it is formed so as to be higher, the rigidity difference between the holes 44, 46, 48 and the recess 40 and the periphery thereof can be reduced to make the rigidity uniform.

Next, in the door structure of the present embodiment, the entire structure of the door module 8 is reliably vibrated in the 1 × 1 vibration mode by the speaker mounting structure in the speaker hole 46 constituting the low-frequency sound increasing means. be able to.
That is, in the speaker hole 46, the mounting portion 46 c of the speaker 34 is provided at a position substantially aligned in a direction orthogonal to the direction toward the substantially central portion of the door module 8. Here, when 1 × 1 mode vibration occurs in the door module 8, the vibration amplitude is distributed so that the amplitude gradually increases from the outer peripheral region to the substantially central region of the door module 8. On the other hand, for example, if a portion with greatly increased rigidity exists over a certain length in the radial direction (the direction from the outer peripheral region to the central region), this portion suppresses the occurrence of 1 × 1 mode vibration. Resulting in.
In the present embodiment, since the speakers are attached at positions substantially aligned in a direction (circumferential direction) orthogonal to the direction toward the substantially central portion of the door module 8, rigidity is increased in the circumferential direction, and in the radial direction. The rigidity can be prevented from increasing. Accordingly, it is possible to easily generate 1 × 1 mode vibration in the door module and to generate a smooth vibration distribution (vibration amplitude distribution). Further, the rigidity can be made uniform by reducing the difference in rigidity between the speaker hole 46 and the periphery thereof. As a result, as described above, the acoustic radiation efficiency can be increased.

Next, in the door structure of the present embodiment, the entire structure of the door module 8 is reliably vibrated in the 1 × 1 vibration mode by the structure of attaching the window regulator 24 constituting the low-frequency sound increasing means to the door module 8. be able to.
First, a part of the rail part 28 and the bracket 30a extend around the work hole 44 so as to surround the work hole 44, and the upper end part of the rail part 28 and the front end part of the bracket 30 respectively work. It is attached to the door module 8 in the vicinity of the hole 44 for use. Therefore, due to the mounting position of the window regulator 24 and the shape of the rail portion 28 and the bracket 30 of the window regulator 24, the portion where the rigidity is not uniform in the door module 8, that is, the work hole portion 44 and the surrounding portion thereof. The rigidity can be made uniform. As a result, as described above, the acoustic radiation efficiency can be increased.

Further, the bracket 30 b of the window regulator 24 is formed so as to extend to substantially the center of the door module 8, and the tip thereof is attached to the substantially center of the door module 8. Accordingly, the weight of the window regulator 24 can be increased substantially at the substantially central portion of the door module 8, and as a result, the 1 × 1 mode vibration in which the central portion becomes the antinode of vibration can be generated more reliably. I can do it. Furthermore, the vibration amplitude of the vibration can be increased by the weight of the window regulator 24.
The bracket 30b is attached to the annular thick portion 50a. Since the annular thick portion 50a is originally a portion with increased rigidity, even if the window regulator 24 is attached via the bracket 30b, vibration in the 1 × 1 mode can be prevented. In addition, when attaching to the linear rib 56, there exists the same effect. Further, when other door functional parts are attached to the door module, the same effects can be obtained even if they are attached to reinforcing parts such as the thick part 50, ribs, and beads.

  Further, the window regulator 24 is attached to a substantially central portion of the door module 8 by a bracket 30b, and is attached in the vicinity of an attachment portion of the door module 8 to the door inner panel 6 by a bracket 30a. Since the vicinity of the portion where the door module 8 is attached to the door inner panel 6 is a portion where the vibration amplitude of the vibration generated in the door module 8 is small, the 1 × 1 mode vibration generated in the door module 8 is not suppressed. I can do it. As a result, a vibration belly is generated at a substantially central portion of the door module 8 with a large vibration amplitude and the vibration is not suppressed, and 1 × 1 mode vibration is smoothly applied to almost the entire door module 8. It can be generated by vibration distribution (vibration amplitude distribution). As a result, as described above, the acoustic radiation efficiency can be increased.

  Next, since the door module 8 is made of resin, its moldability is high. Accordingly, the resin door module 8 is provided with first to fourth reinforcing structures 50, 56, 60, and 70, a structure for attaching the speaker to the speaker hole 46, and the window regulator 24. An attachment structure to the door module 8 can be easily provided. As a result, low-frequency sound increasing means can be provided at low cost. Further, it is possible to provide a low-frequency sound increasing means without greatly increasing the weight or reducing the weight. Furthermore, workability at the time of manufacture and attachment is not reduced. Furthermore, with a simple structure that only adjusts the rigidity, it is possible to increase low-frequency sound that allows the occupant to feel heavy.

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 connecting portions 22d arranged in the direction from the door latch portion 16 toward the opposite side are connected weaker than the other connecting portions 22 so as to allow the door module 8 to be displaced. Therefore, it is possible to prevent the vibration of the 1 × 1 mode of the door module 8 increased by the low-frequency sound increasing means.
In particular, these connecting portions 22d are arranged in the vicinity of the middle in the direction from the door latch portion 16 toward the opposite side, and the portion near the middle is directed from the door latch portion 16 to the opposite door hinge 14 side. Since the vibration amplitude of the antinode of the 1 × 1 mode vibration distributed in the direction is large, the vibration of the 1 × 1 mode can be prevented from being suppressed.
Moreover, in the connection part 22d, since the door module 8 is connected with the door inner panel 6 with the volt | bolt and the nut via the elastic body, the displacement with respect to the door inner panel 6 of the door module 8 can be permitted effectively. .

Next, the effect of the structure of the door latch part 16 in the door structure of this embodiment, and the connection structure of the door module 8, the door inner panel 6, and the door latch part 16 are demonstrated.
In the present embodiment, since the door module 8, the door inner panel 6, and the door latch bracket 18 are fastened together, vibration generated in the door latch mechanism 20 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.
In particular, since the mounting rigidity at these joint parts 20b that are fastened together is higher than that of the other joint parts 22, vibrations can be transmitted more efficiently. Further, the joints are connected by a plurality of bolts, and these bolts are arranged in two rows along the direction from the door latch portion 16 toward the door module 8, that is, the direction intersecting with the direction in which vibration is transmitted. Therefore, vibration can be transmitted more efficiently.

  Further, since a triangular closed cross section is formed between the door latch bracket 18 and the door inner panel 6, vibration generated in the door latch mechanism 20 can be efficiently transmitted to the door module 8. Here, as shown in FIG. 9, when the door is closed, the latch (not shown) of the door latch mechanism hits a striker (not shown), and the door inner panel 6 has a portion as shown by h in FIG. 9 as a fulcrum. A bending force that is bent in a direction as indicated by i in FIG. 9 (a direction in which the vertical direction of the vehicle body is the central axis) is received. That is, if the triangular closed cross section is not configured, the door inner panel 6 vibrates with bending deformation such that the rear end face 6g and the rear region 6c approach or separate from each other due to the bending force. .

On the other hand, since the door inner panel 6 and the door latch bracket 18 form a triangular closed cross section, the door inner panel 6 is not easily deformed. Therefore, most of the vibration energy generated in the door latch portion 16 is not transmitted as energy for deforming the door inner panel 6 but most of the vibration energy is efficiently transmitted to the door module 8 as vibration energy for vibrating the door module 8 in the out-of-plane direction. Is done. Therefore, as described above, the 1 × 1 mode of vibration that generates one large antinode in the longitudinal direction of the vehicle body of the door module 8 (the direction from the door latch 16 side to the opposite side) is reliably generated. It can be made.
Furthermore, since the 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, vibration energy generated in the door latch portion 16 is transferred to the door module 8. It can be transmitted effectively.

Next, in the door structure of this embodiment, the effect of the vibration shielding reinforcing portion 90 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 door inner panel 6 is for vibration isolation so as to surround the door module 8 with other regions 6b, 6d, and 6e excluding the rear region 6c on the side where the door latch portion 16 of the door inner panel 6 is fixed. Since the reinforcing portion 90 (the first vibration blocking portion 92a) is formed, the vibration transmitted to the door module 8 is further hardly transmitted to each of the regions 6b, 6d, 6e. As a result, the door inner panel 6 It is possible to prevent high-frequency sound from being emitted. 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.

Further, the second vibration blocking unit 92b has a first vibration at each of the upper and lower portions of the door latch portion 16 so that vibration generated in the door latch mechanism 20 is not easily transmitted to the upper region 6d and the lower region 6e of the door inner panel 6. It extends continuously from the blocking portion 92a. 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.
Furthermore, since the vibration isolating reinforcing portion 90 is formed so as to continuously extend in a linear shape, the above-described operational effects of the vibration isolating reinforcing portion 90 can be obtained more reliably.
On the other hand, since the vibration isolating reinforcing portion 90 surrounding the door module 8 is not formed in the rear region 6c, vibration generated in the door latch mechanism 20 can be efficiently transmitted to the door module 8.

Further, since the vibration blocking reinforcing portion 90 is a step portion 92 having high rigidity, vibration transmitted from the door module 8 to the door inner panel 6 or directly transmitted from the door latch mechanism 20 to the door inner panel 6 is transmitted. Vibration can be effectively cut off. In addition, since the door inner panel is reinforced by the vibration blocking reinforcing portion, the door inner panel is less likely to vibrate, and the generation of high-frequency sound is suppressed.
Further, since the step portion 92 is formed so as to protrude in the out-of-plane direction from the door module 8, the step portion 92 is formed as a wall that faces 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 90 is configured in the same manner with the bead portion 94, the same effects can be obtained.

  In the present embodiment, the door structure of the automobile of the present invention is applied to the front door, but it can also be applied to a rear door, a slide door, and the like.

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. It is sectional drawing which shows the 4th reinforcement structure provided in the 1st reinforcement structure seen along the III-III line of FIG. 2, and the hole for harnesses. A sectional view (a) showing the first reinforcing structure and the second reinforcing structure seen along line IV-IV in FIG. 2 and a second reinforcing structure seen along line bb in the sectional view (a). It is sectional drawing (b). It is sectional drawing which shows the 4th reinforcement structure provided in the hole for work seen along the VV line of FIG. It is sectional drawing which shows the 4th reinforcement structure provided in the hole part for speakers seen along the VI-VI line of FIG. It is sectional drawing which shows the 4th reinforcement structure provided in the recessed part for motor accommodation seen along the VII-VII line of FIG. It is sectional drawing which shows the connection part of the door module and door inner panel which looked along the VIII-VIII line 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-IV line of FIG. 2, and the connection structure of a door module, a door inner panel, and a door latch bracket. It is sectional drawing similar to FIG. 8 which shows the modification of the vibration insulation reinforcement part provided in the door inner panel shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Door outer panel 6 Door inner panel 6a Opening part 6b-e Front area | region, rear area | region, upper area | region, lower area | region of a door inner panel 8 Door module 16 Door latch part 18 Door latch bracket 20 Door latch mechanism 22 Connection with a door module and a door inner panel Section 24 Window regulator 28 Rail section 30 Bracket 32 Motor 33 Mounting section of window regulator to door module 40 Motor housing recess 44 Working hole 46 Speaker hole 48 Harness hole 50 Annular thick part (first reinforcement) Part)
56 Straight rib (second reinforcing part)
60 Radial rib (third reinforcing part)
70 4th reinforcement part 72 Opening reinforcement rib (4th reinforcement part)
74 Hole reinforcement rib (4th reinforcement part)
76 Reinforcement rib (4th reinforcement part)
84 Elastic body 90 Reinforcing part for vibration isolation 92 Stepped part 94 Bead part

Claims (7)

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 which is disposed on the passenger compartment side of the door outer panel and the door latch is fixed and an opening is formed;
A resin door module provided with a door functional part and attached to the door inner panel so as to cover the opening of the door inner panel;
This door module includes an increasing means for increasing the acoustic conversion efficiency of a specific low-frequency vibration of the door latch vibration generated when the door is closed,
The door inner panel includes a vibration blocking reinforcing portion formed so as to surround the door module in a region other than a region where the door latch is fixed. Construction.   The automobile door according to claim 1, wherein the vibration blocking reinforcing portion of the door inner panel continuously extends to a region of the door inner panel where the door latch is fixed and extends above and below the door latch. Construction.   The automobile door structure according to claim 1 or 2, wherein the vibration blocking reinforcing portion is a stepped portion or a bead portion formed so as to protrude outward from the door module. The door module is formed in a quadrangular shape having a long side and a short side, and is attached to the door inner panel at a plurality of connecting portions along a peripheral portion thereof.
Among the plurality of connecting portions, all or a part of the plurality of connecting portions arranged in the long side direction of the door module is displaced relative to the door inner panel of the door module than the plurality of connecting portions arranged in the short side direction. The door structure of the automobile according to any one of claims 1 to 3, wherein the door structure is weakly connected so as to allow the above. The door module is attached to the door inner panel at a plurality of connecting portions along the peripheral edge thereof,
Among the plurality of connecting portions, all or a part of the plurality of connecting portions arranged in the direction from the side on which the door latch is fixed toward the opposite side thereof are the side on which the door latch is fixed and the opposite side. 4. The automobile door structure according to claim 1, wherein the door module is weakly connected so as to allow displacement of the door module with respect to the door inner panel than a plurality of connecting portions arranged along the door. 5.   6. The automobile according to claim 4 or 5, wherein the connecting portion weakly connected to allow the displacement includes an elastic body, and the door module is attached to the door inner panel via the elastic body. Door structure.   7. The increasing means according to claim 1, wherein a reinforcing portion for adjusting the rigidity of the door module is formed integrally with the door module so that a 1 × 1 vibration mode is generated in the door module. An automobile door structure according to any one of the preceding claims.

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