JP2011246010A - Vehicle structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle structure for suppressing the transmission of noise entered from a gap between an internal components and a vehicle component.SOLUTION: A front pillar garnish 34 is disposed inside a pillar inner panel 18. Ribs 48a, 48b are protruded from a pillar inner garnish body 36 toward the pillar inner panel 18. An expansion muffler 54 having an expansion muffling chamber 52 is configured.

Description

  The present invention relates to a vehicle structure, and more particularly, to a vehicle structure in which an inner member is disposed further on the vehicle interior side than an inner panel of a vehicle component member that constitutes an outer shell of the vehicle.

  Japanese Patent Application Laid-Open No. H10-228561 shows a trim structure of an automobile in which a large number of needle-like elongated ribs are integrally formed on the back side of a trim trim plate attached to a front pillar inner panel. In the trim structure of this patent document 1, the impact force applied to the trim plate can be absorbed by the inclined deformation of the rib.

  By the way, as described in Patent Document 1, in the configuration having the pillar and the trim plate on the vehicle interior side, there is a possibility that sound between these leaks from the end of the trim plate into the vehicle interior.

JP-A-7-117596

  In view of the above facts, an object of the present invention is to obtain a vehicle body structure capable of suppressing transmission of sound between a vehicle component and a gap between an inner member disposed on the vehicle interior side and the vehicle interior.

  According to the first aspect of the present invention, a vehicle structural member that forms an outer shell of the vehicle and a part of which is an inner panel positioned on the vehicle interior side, covers the inner panel on the vehicle interior side than the inner panel. And an inner member that forms a gap with the inner panel, and an extended end that extends from an end portion of the inner member so that a gap is formed between the inner panel and the gap. An expansion silencer disposed in a sound passage between the vehicle interior and an entrance having a narrower cross-sectional area than the expansion silencer disposed on both sides in the sound passage direction of the expansion silencer. And an extending piece constituting the outlet part and the outlet part.

  In this vehicle structure, the inner panel is covered with the inner member on the vehicle interior side of the inner panel, and a gap is formed between the inner member and the inner panel. Moreover, the extension piece is extended from the edge part of an inner side member. The extension piece is formed so that the extension end forms a gap between the inner panel and the expansion type silencer chamber disposed in the sound passage between the gap and the vehicle interior, The inlet part and outlet part which are arrange | positioned at the both sides of the passage direction of the sound of an expansion type silencing chamber and the cross-sectional area through which a sound passes are narrower than an expansion type silencing room are comprised. That is, in the present invention, a so-called expansion silencer is provided. As a result, it is possible to suppress the transmission of sound between the vehicle constituent member and the inner member disposed on the vehicle interior side and the vehicle interior (hereinafter referred to as “silence”).

  In particular, the extension piece extends from the end portion of the inner member, and an expansion-type silencer is disposed in the downstream portion in the moving direction of the sound transmitted to the outside through the gap between the inner panel and the inner member. Will be. For example, the silencing effect can be more reliably exhibited as compared with a configuration in which an extending piece is extended from the central portion of the inner member.

  In addition, if two extended pieces are extended from the inner member, the above-described inlet portion and outlet portion are configured in the gap between the extended end of each extended piece and the inner panel. On the other hand, the inner member may serve as one of the extended pieces. In this case, an inlet portion or an outlet portion is formed between the inner member that also serves as the extending piece and the inner panel.

  Further, three or more extending pieces may be formed. In this case, an inlet portion is formed in the gap between the extension piece on the upstream end side in the sound moving direction and the inner panel, and an outlet portion is provided in the gap between the extension piece on the downstream end side and the inner panel. However, the gap between the intermediate extension piece and the inner panel includes an outlet portion when viewed from the upstream expansion silencer chamber and an inlet portion when viewed from the downstream expansion silencer chamber. It will also serve as.

  According to a second aspect of the present invention, in the first aspect of the present invention, the inner member has a continuous shape along the inner panel, and the extending piece is a length of the end portion of the inner member. By forming continuously along the direction, the expansion-type silencer chamber has a continuous shape along the longitudinal direction.

  Therefore, the inner panel can be continuously covered by the inner member. In addition, since the extending piece is continuously formed along the longitudinal direction of the end portion of the inner member, and the expansion type silencing chamber is also formed in a continuous shape along the longitudinal direction, the length of the inner member is increased. It becomes the structure which has a silencing effect continuously along a direction.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the gap includes a sound absorbing material disposed in the center between one end and the other end of the inner member.

  Thus, by arranging the sound absorbing material in the gap, the sound in the gap can be absorbed by the sound absorbing material. In particular, the sound absorbing material is arranged at the center between one end (one end) and the other end (the other end) of the inner member. That is, in the gap, one end and the other end serve as vibration nodes, and the center part absorbs vibration at the antinodes against the sound of vibration. Therefore, a higher sound absorbing effect can be obtained as compared with the structure in which the sound absorbing material is arranged at a place other than the center described above.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a part of a vehicle constituent member constituting the vehicle is accommodated in the gap to be a accommodated member. The extending piece extends from the inner member on the end side with respect to the member to be accommodated.

  That is, a part of the vehicle constituent member can be accommodated as the accommodated member by effectively using the gap. Since the extended piece is extended from the inner member on one end side of the accommodated member, inadvertent interference between the accommodated member and the extended piece can be suppressed.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein an expansion coefficient that is a ratio of the cross-sectional area of the expansion-type silencing chamber to the cross-sectional area of the gap is set. 20 or more.

  Thus, by setting the expansion coefficient, that is, the expansion coefficient, which is the ratio of the cross-sectional area of the expansion-type silencing chamber to the cross-sectional area of the gap, to be 20 or more, it is possible to reliably exhibit the silencing effect. Note that the upper limit of the expansion coefficient is not particularly limited from the viewpoint of obtaining a reliable silencing effect.

  In invention of Claim 6, in the invention of any one of Claims 1-5, the said vehicle structural member is a pillar provided with the pillar inner panel as said inner panel, The said inner member is The pillar garnish is disposed on the vehicle interior side of the pillar inner panel.

  Therefore, the interior of the passenger compartment can be configured by the pillar garnish. Further, it is possible to suppress the transmission of this sound with respect to the sound transmitted from the gap between the pillar and the pillar garnish to the vehicle interior. For example, it is possible to suppress noise such as engine noise, road noise, and wind noise from being transmitted to the vehicle interior.

  Since the present invention is configured as described above, it is possible to suppress the transmission of sound from the gap between the vehicle component and the inner member disposed on the vehicle interior side to the vehicle interior.

It is a perspective view showing the appearance shape of the vehicle to which the vehicle structure of the present invention is applied. It is sectional drawing which shows the front pillar structure which is the vehicle structure of 1st Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. (A) is sectional drawing which expands and shows the front pillar structure of 1st Embodiment of this invention in the vicinity of an expansion-type silencer, (B) models the expansion-type silencer which concerns on 1st Embodiment. It is explanatory drawing shown. It is sectional drawing which shows the front pillar structure which is the vehicle structure of 2nd Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. It is explanatory drawing which shows the position of the sound-absorbing material in a front pillar structure, (A) is the case of 2nd Embodiment of this invention, (B) is the case of a comparative example, The vehicle front part of 1st Embodiment of this invention It is a perspective view which shows a structure typically. It is sectional drawing which shows the front pillar structure which is the vehicle structure of 3rd Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. (A) is sectional drawing which expands and shows the front pillar structure of 3rd Embodiment of this invention in the vicinity of an expansion-type silencer, (B) models the expansion-type silencer which concerns on 3rd Embodiment. It is explanatory drawing shown. It is sectional drawing which shows the front pillar structure which is the vehicle structure of 4th Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. (A) is sectional drawing which expands and shows the front pillar structure of 4th Embodiment of this invention in the vicinity of an expansion-type silencer, (B) models the expansion-type silencer which concerns on 4th Embodiment. It is explanatory drawing shown. It is sectional drawing which shows the front pillar structure which is the vehicle structure of 5th Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. It is sectional drawing which shows the front pillar structure which is a vehicle structure of 6th Embodiment of this invention in the cross section orthogonal to the longitudinal direction of a front pillar. It is sectional drawing which shows the front door structure which is a vehicle structure of 7th Embodiment of this invention in a cross section of a perpendicular direction as a part of front door. (A) is sectional drawing which expands and shows the front door structure of 7th Embodiment of this invention near the expansion-type silencer, (B) models the expansion-type silencer which concerns on 7th Embodiment. It is explanatory drawing shown. It is a graph which shows the theoretical calculation value of the sound insulation performance of the opt sealer used for the automobile as a relation between frequency and transmission loss. It is a graph which shows the relationship between the expansion coefficient and the transmission loss in the expansion type silencer in 1st Embodiment of this invention. It is a graph which shows the relationship between the frequency and transmission loss in an expansion type silencer.

<First Embodiment>
FIG. 1 shows a vehicle 10 to which a front pillar structure 12 according to a first embodiment of the present invention is applied. Further, FIG. 2 shows the front pillar structure 12 in a cross section taken along line 2-2 in FIG. 1 (a cross section orthogonal to the longitudinal direction of the front pillar 14). The front pillar structure 12 is an example of the vehicle body structure of the present invention.

  As shown in FIG. 2, the front pillar 14 as a vehicle component according to the present invention includes a pillar inner panel 18 positioned on the inner side (vehicle interior side) of the vehicle 10 and a pillar outer panel 16 positioned on the outer side of the vehicle 10. And have. Further, in this front pillar 14, a pillar reinforcement 20 is disposed inside. The front pillar 14 is reinforced by the pillar reinforcement 20. The pillar inner panel 18 corresponds to the inner panel of the present invention.

  Each of the pillar inner panel 18 and the pillar outer panel 16 is formed in a substantially long shape, and has a longitudinal direction at one end portion 14A (left upper end portion in FIG. 2) in a direction orthogonal to the longitudinal direction of the front pillar 14. A joining flange 22 </ b> A extending along the line is formed. Similarly, a joining flange 22B extending along the longitudinal direction is also formed from the other end portion 14B (lower right side end portion in FIG. 2) in a direction orthogonal to the longitudinal direction. With these joining flanges 22A and 22B, one end 20A and the other end 20B of the pillar reinforcement 20 are partially sandwiched, and the sandwiched part (part where the panel is overlapped in triplicate) is joined by welding or the like. A hollow pillar-shaped (however, pillar reinforcement 20 is disposed inside) front pillar 14 is configured. In the following, the direction connecting the one end portion 14A and the other end portion 14B of the front pillar 14 is the width direction of the front pillar 14 and is indicated by an arrow W1.

  A molding 26 is attached to the front pillar 14 and is disposed between the windshield glass 24 and closes the gap between the front pillar 14 and the windshield glass 24. Further, an opening weather strip 32 is attached to the front pillar 14 so as to close the gap between the front pillar 14 and the front door 30 by being in close contact with the front door 30 in a state where the doorway of the vehicle body is closed.

  A front pillar garnish 34 as an inner member in the present invention is arranged further on the vehicle interior side of the pillar inner panel 18. The front pillar garnish 34 covers the front pillar 14 on the vehicle interior side and constitutes the interior of the vehicle interior. Further, as can be seen from FIG. 2, the front pillar garnish 34 according to the first embodiment has a pillar garnish main body 36 that is bent or curved at a predetermined position in a sectional view. A gap 38 is formed between the inner panel 18 and the pillar inner panel 18.

  Part of members such as the wire harness 42, the drain 44, and the curtain airbag device 46 are accommodated in the gap 38. That is, in each of these members, the portion accommodated in the gap 38 is the accommodated member 40 according to the present invention.

  One end portion 36 </ b> A (the upper left end portion in FIG. 2) of the pillar garnish main body 36 is separated from the windshield glass 24. The other end 36 </ b> B (lower right end in FIG. 2) of the pillar garnish main body 36 is in contact with the opening weather strip 32.

  Two ribs 48 </ b> A and 48 </ b> B protrude from the pillar garnish main body 36 toward the pillar inner panel 18 on the one end 36 </ b> A side of the accommodated member 40. The ribs 48A and 48B correspond to the extending pieces according to the present invention.

  As shown in detail in FIG. 3, the ribs 48 </ b> A and 48 </ b> B are both substantially constant in thickness, and are formed in a long shape that continues from the lower end to the upper end along the longitudinal direction of the pillar garnish body 36. The protruding ends of the ribs 48 </ b> A and 48 </ b> B have a protruding length that does not come into contact with the pillar inner panel 18 so that predetermined small gaps 50 </ b> A and 50 </ b> B are formed between the rib 48 </ b> A and 48 </ b> B. In the present embodiment, the gap lengths D1 of the gaps 50A and 50B (the lengths from the protruding ends of the ribs 48A and 48B to the pillar inner panel 18) are equal. Hereinafter, when it is not necessary to distinguish the plurality of ribs in particular, the description will be given as “ribs 48”. Similarly, when there is no need to particularly distinguish a plurality of gaps, the explanation will be given as “gap 50”.

  The two ribs 48A and 48B protrude in parallel, and the space surrounded by the ribs 48A, ribs 48B, the front pillar garnish 34, and the pillar inner panel 18 becomes an expansion type silencing chamber 52 as will be described later. ing. In the present embodiment, since there are two ribs, the number of the expansion type silencing chambers 52 is one. Further, in the present embodiment, the expansion-type sound deadening chamber 52 is opened on the upper end side and the lower end side of the front pillar garnish 34. For example, by bending the upper end portion and the lower end portion of the rib 48A and the rib 48B, The expansion type silencing chamber 52 may be closed at the upper end side and the lower end side of the front pillar garnish 34.

  Here, as shown in FIG. 3A, let us consider a passage path SP of sound transmitted from the gap 38, that is, between the pillar inner panel 18 and the front pillar garnish 34, into the passenger compartment 58. At this time, the cross-sectional area of the sound passage portion is narrowed by the gap 50A and once widened in the expansion type silencing chamber 52 between the ribs 48A and 48B, but is narrowed again by the gap 50B. That is, the gap 50A corresponds to the inlet portion in the present invention, and the gap 50B corresponds to the outlet portion in the present invention, and the expansion silencer 54 is disposed in the sound passage path SP. In other words, the expansion type silencing chamber 52 is disposed in the sound passage path SP between the gap 38 and the vehicle interior 58, and both sides (upstream side and downstream side) of the expansion type silencing chamber 52 in the sound passing direction. Then, the ribs 48 </ b> A and 48 </ b> B are extended so that the inlet and outlet portions where the cross-sectional area through which sound passes is narrower than that of the expansion-type silencing chamber 52 are arranged. Moreover, the expansion silencer 54 is located in the downstream portion of the sound moving direction from the gap 38 into the vehicle interior 58 (see FIG. 2).

  FIG. 3B shows the model of the expansion silencer 54 of the present embodiment. In the silencer model 56, the cross-sectional areas of the portions corresponding to the gaps 50A and 50B and the expansion-type silencer chamber 52 are S1 and S2, respectively. In addition, the length of the expansion-type silencing chamber 52 (the length along the sound passing direction) is set to l. At this time, if the sound frequency is f and the sound speed is c, the transmission loss TL is

It is expressed. This transmission loss TL is one of indices indicating sound insulation performance when sound passes through the expansion silencer 54. As can be seen from FIG. 3A, in the shape of the expansion silencer chamber 52 of the present embodiment, the cross-sectional area S2 changes along the arrow SP direction. The value may be the above S2. Specifically, the volume of the expansion type silencing chamber 52 may be divided by the above length l.

  Next, the operation of the front pillar structure 12 of this embodiment will be described.

  Since various sounds such as engine noise, road noise, wind noise and the like enter from the outside into the gap 38, this sound is transmitted from the gap 38 between the front pillar garnish 34 and the pillar inner panel 18 into the vehicle interior 58, There is a risk of sound leakage.

  In the front pillar structure 12 of the present embodiment, by providing the two ribs 48A and 48B on the pillar garnish main body 36, the expansion type silencing chamber 52 is provided in the sound passage path SP from the gap 38 into the vehicle interior 58. There is an inflatable silencer 54 provided. Therefore, transmission of sound from the gap 38 into the passenger compartment 58, that is, sound leakage into the passenger compartment 58 is suppressed.

  In particular, the ribs 48 </ b> A and 48 </ b> B are formed in a long continuous shape from the lower end to the upper end along the longitudinal direction of the pillar garnish main body 36, so that the expansion type sound deadening chamber 52 also extends along the longitudinal direction of the pillar garnish main body 36. It is comprised continuously from the lower end to the upper end. That is, sound leakage can be suppressed in a wide range along the longitudinal direction of the pillar garnish main body 36.

Second Embodiment
FIG. 4 shows a front pillar structure 112 according to the second embodiment of the present invention. In the second embodiment, the same components and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the front pillar structure 112 of the second embodiment, the sound absorbing material 114 is attached to the pillar garnish main body 36 so as to be positioned in the gap 38. The sound absorbing material 114 is made of a porous material such as felt or sponge, for example, and is a member that can more effectively absorb vibration energy of gas molecules than the pillar inner panel 18 and the front pillar garnish 34.

  The sound absorbing material 114 is located on the vertical bisector L2 of the line segment L1 connecting the rib 48A closest to the center in the width direction among the plurality of ribs and the other end 34B side of the front pillar garnish 34. As can be seen from FIG. 4 (and as schematically shown in FIG. 5A), in the gap 38, the resonance 48 of the resonance RS having the rib 48A and the other end 34B as nodes and the central part thereof as an antinode. Assuming vibration, the sound absorbing material 114 is arranged at the antinode position in the vibration of the resonance RS.

  Except for the above, the front pillar structure 112 of the second embodiment has the same configuration as the front pillar structure 12 of the first embodiment.

  Therefore, the front pillar structure 112 according to the second embodiment also has the same effects as the front pillar structure 12 according to the first embodiment. However, in the front pillar structure 112 according to the second embodiment, the front pillar structure 112 occurs in the gap 38. The sound absorption effect can be enhanced by absorbing the energy of the resonance RS with respect to the resonance RS.

  In particular, the sound absorbing material 114 is disposed at the antinode position of the resonance RS. Since the anti-vibration particle velocity is maximum at this antinode position, as shown in FIG. 5B, the sound absorbing material 114 is compared with a configuration in which the sound absorbing material 114 is arranged at a position other than the antinode of anti-resonance RS. Therefore, the effect of absorbing resonance energy (dissipating as thermal energy) is high. Therefore, the sound absorption effect for the resonance RS can be exhibited more effectively.

<Third Embodiment>
FIG. 6 shows a front pillar structure 212 according to a third embodiment of the present invention. Also in the third embodiment, the same components and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the front pillar structure 212 of the third embodiment, as shown in detail in FIG. 7A, four ribs 214A, 214B, 214C, and 214D protrude from the pillar garnish main body 36. Each of the ribs 214A, 214B, 214C, and 214D has predetermined small gaps 216A, 216B, 216C, and 216D formed between the protruding end and the pillar inner panel 18. The four ribs 214A, 214B, 214C, and 214D protrude in parallel, and three expansion type sound deadening chambers 218A, 218B, and 218C are formed between the ribs.

  Therefore, in the front pillar structure 212 of the third embodiment, the gap 216A is an inlet portion in the present invention, and the gap 216D is an outlet portion in the present invention, but the gap 216B is an outlet portion for the expansion type silencing chamber 218A, It also serves as an inlet for the expansion type silencing chamber 218B. Similarly, the gap 216C serves as an outlet for the expansion silencer 218B and an inlet for the expansion silencer 218C.

  In the front pillar structure 212 of the third embodiment configured as described above, as shown in FIG. 7B as a model, the expansion silencer including the three expansion silencers 218A, 218B, and 218C is provided. 220 is configured. As can be seen from the silencer model 222, since the number of the expansion type silencer chambers is larger than that in the first embodiment, the effect of suppressing sound transmission from the gap 38 into the vehicle interior 58 is enhanced. Note that the number of expansion-type silencing chambers is not limited to three, and if the number of expansion-type silencing chambers is plural (two or more), the effect of suppressing the above-described sound transmission is higher than that of a single expansion-type silencing chamber. .

  As described above, the number of ribs protruding from the pillar garnish main body 36 is not particularly limited as long as at least one inflatable silencer chamber can be configured. A member 38 (not shown in FIG. 6; see FIG. 2) is accommodated in the gap 38. However, if more ribs are provided in a space-possible range, the number of inflatable silencers can be increased. Can do a lot.

<Fourth embodiment>
FIG. 8 shows a front pillar structure 312 according to a fourth embodiment of the present invention. Also in the fourth embodiment, the same components and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the front pillar structure 312 of the fourth embodiment, only one rib 314 </ b> A protrudes from the pillar garnish main body 36, and a predetermined slight gap 316 </ b> A is formed between the pillar inner panel 18. Further, the shape of the pillar garnish main body 36 is determined so that one end portion 36 </ b> A of the pillar garnish main body 36 forms a predetermined gap 316 </ b> B with the windshield glass 24. And in the front pillar structure 312 of 4th Embodiment, the expansion type silencing chamber 318 is comprised between the one end part 36A of the pillar garnish main body 36, and the rib 314A. That is, as shown in FIG. 9B as a model, the expansion silencer 320 including the expansion silencer chamber 318 is configured. In effect, a part of the pillar garnish main body 36 (one end 36 </ b> A) also serves as a rib for constituting the expansion silencer 320.

  Therefore, the front pillar structure 312 of the fourth embodiment also has an effect of suppressing transmission of sound from the gap 38 into the passenger compartment 58. Moreover, although one expansion type silencing chamber 318 is configured as in the first embodiment, there is also an effect that the number of ribs protruding from the pillar garnish main body 36 can be reduced.

  In contrast, when the rib is formed separately from the pillar garnish main body 36 as in the first to third embodiments, the shapes of the pillar garnish main body 36 and the rib can be determined independently, and the design (shape) ) Has a higher degree of freedom.

  Further, in the structure including a plurality of expansion-type sound deadening chambers as in the front pillar structure 212 of the third embodiment, one of the plurality of ribs may be shared by the pillar garnish main body 36.

<Fifth Embodiment>
FIG. 10 shows a front pillar structure 412 according to a fifth embodiment of the present invention. Also in the fifth embodiment, the same components and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the front pillar structure 412 of the fifth embodiment, two ribs 414 </ b> A and 414 </ b> B protrude from the pillar garnish main body 36 on the other end 36 </ b> B side with respect to the accommodated member 40. Gaps 416AA and 416B are formed between the protruding ends of the ribs 414A and 414B and the pillar inner panel 18. An expansion type silencing chamber 418 is formed between the two ribs 414A and 414B. In other words, in the fifth embodiment, the expansion silencer 420 exists on the other end 36 </ b> B side of the accommodated member 40.

  Therefore, in the front pillar structure 412 of the fifth embodiment, it is possible to suppress the transmission of sound that enters the passenger compartment 58 through the opening weather strip 32 on the other end 36 </ b> B side from the gap 38.

<Sixth Embodiment>
FIG. 11 shows a front pillar structure 512 according to a sixth embodiment of the present invention. In the front pillar structure 512 of the sixth embodiment, the expansion silencer 54 is provided on the one end portion 36A side of the pillar garnish main body 36, and further, the expansion silencer is also provided on the other end portion 36B side as in the fifth embodiment. A device 420 is provided. Thereby, the transmission of sound from the gap 38 into the passenger compartment 58 can be more effectively suppressed.

  In addition, it is good also as said front-pillar structure which concerns on this invention combining each said embodiment suitably. For example, the sound absorbing material 114 may be applied to the third to sixth embodiments.

  In the above description, the front pillar structure is raised as the vehicle structure of the present invention. However, for example, the structure similar to the above may be applied to the center pillar, the rear pillar, or the like to form the vehicle structure of the present invention.

Furthermore, the vehicle structure of the present invention is not limited to these pillar structures.
<Seventh embodiment>
FIG. 12 shows a front door structure 612 as a seventh embodiment of the vehicle structure of the present invention. 12 is a sectional view taken along line 13-13 in the vehicle 10 shown in FIG. In FIG. 1, for convenience, a configuration including both the front pillar structure 12 of the first embodiment and the front door structure 612 of the seventh embodiment is illustrated, but both of these are applied to a single vehicle 10. You don't have to.

  In the front door structure 612 of the seventh embodiment, a door outer panel 616 and a door inner panel 618 are joined, and a door trim 620 is attached to the interior of the vehicle compartment 58 with respect to the door inner panel 618 to constitute the front door 614. Has been. A gap 622 is formed between the door trim 620 and the door inner panel 618.

  As shown in detail in FIG. 13A, two ribs 624 </ b> A and 624 </ b> B protrude from the flange portion 620 </ b> B provided at the lower end portion of the door trim 620 toward the door inner panel 618. Clearances 626A and 626B are formed between the protruding ends of the ribs 624A and 624B and the door inner panel 618. An expansion type silencing chamber 628 is formed between the ribs 624A and 624B.

  Therefore, in the front door structure 612 of the seventh embodiment, as shown in FIG. 13B as a model, the expansion type sound deadening chamber 628 is provided on the flange portion 620B side provided at the lower end portion of the door trim 620. The expansion silencer 630 is arranged. In the front door structure 612 of the seventh embodiment, the sound transmitted from the lower side of the door trim 620 into the gap 622 can be absorbed by the expansion silencer 630.

  In the seventh embodiment, not only the lower end portion (flange portion 620B) of the door trim 620 but also an expansion silencer may be provided at the upper end portion, the vehicle front side end portion, the vehicle rear side end portion, and the like.

  The vehicle structure of the present invention can be applied to a rear door structure and a back door structure in addition to the front door structure 612 of the seventh embodiment. Furthermore, it is applicable not only to these door structures but also to an instrument panel structure.

  In the vehicle structure of the present invention, the cross-sectional area S2 of the expansion type silencing chamber and the cross-sectional area S1 of the gap 50A may satisfy the silencing performance required for the expansion type silencer. Here, FIG. 14 shows the theoretical calculation values of the sound insulation performance of the epto-sealer used in the automobile. The opt sealer is, for example, a foamed resin or foamed rubber member used as a sound absorbing material in a car body (including around a door). In the case of an eptsealer formed in a plate shape, a minimum plate thickness of about 5 mm is often secured. The graph shown in FIG. 14 shows the relationship between the transmission loss and the frequency in the eptosealer having a thickness of 5 mm. In general, as a measure against vehicle noise, a range of a sound frequency of about 1 to 12500 Hz is often considered. For example, when the frequency is 10000 Hz, it is understood that a transmission loss of 25 dB can be secured. Therefore, in the present invention, it is desirable to secure at least a transmission loss (25 dB) comparable to that of the eptosealer with the minimum thickness.

  FIG. 15 shows the relationship between the expansion rate and transmission loss of the expansion silencer 54 according to the first embodiment. The expansion coefficient here is the ratio (S2 / S1) of the cross-sectional area S2 of the expansion-type silencing chamber 52 to the cross-sectional area S1 of the gap 50A. From this graph, it can be seen that the expansion coefficient should be 20 or more in order to secure 25 dB or more as transmission loss.

  In the present invention, the length along the longitudinal direction of the pillar garnish main body 36 is the same between the gap 50A and the expansion type silencing chamber 52, and therefore, the expansion rate is the expansion type silencing with respect to the gap length D1 of the gap 50A. The width is the same as the width W2 of the chamber 52 (see FIG. 3A). For example, when the width W2 of the expansion type silencing chamber 52 is 40 mm, the above expansion rate can be 20 or more if the gap length D1 of the gap 50A is 2 mm or less.

  Further, the length l of the expansion type sound deadening chamber is set so that necessary and sufficient sound absorbing performance can be obtained in the assumed frequency range. Here, FIG. 16 shows a change in TL (transmission loss) when the values of S1, S2 and l are fixed and f (frequency) is changed in the above-described equation (1). (The value of the transmission loss on the vertical axis changes depending on S1, S2, etc., and is omitted here because it is not the essence of the discussion). The transmission loss is a function that protrudes upward at a constant period, and as shown by a two-dot chain line ZP in this graph, a frequency at which the transmission loss is zero (hereinafter referred to as “specific frequency”) appears at a constant period. As can be seen from equation (1), the specific frequency decreases as the value of l increases.

  Here, as described above, as a general noise countermeasure for one vehicle, a range in which the sound frequency is about 1 to 12500 Hz is considered. Therefore, the value of 1 should be set small so that the specific frequency becomes 12,500 Hz or higher so that the transmission loss does not become zero at the frequency of 12,500 Hz.

  From this point of view, there is no problem even if the frequency when the value of l is reduced and the transmission loss has a maximum value (indicated by the alternate long and short dash line MP in the graph of FIG. 16) exceeds 12,500 Hz (frequency 12,500 Hz). Transmission loss does not become zero). However, if the frequency at which the transmission loss takes a maximum value greatly exceeds 12500 Hz, the transmission loss generally decreases in the assumed frequency range (0 to 12500 Hz). Therefore, in order to generally obtain a high transmission loss in the frequency range of 0 to 12500 Hz, it is preferable to set the value of l large so that the frequency when the transmission loss takes a maximum value is 12500 Hz or less.

10 Vehicle 12 Front Pillar Structure 14 Front Pillar (Vehicle Component)
16 Pillar outer panel 18 Pillar inner panel (inner panel)
24 Windshield glass 30 Front door 34 Front pillar garnish 36 Pillar garnish body (inner member)
38 Gap 40 Housed member 48 Rib (extending piece)
50 Gap 52 Expansion type silencer chamber 54 Expansion type silencer 58 Car compartment 112 Front pillar structure 114 Sound absorbing material 212 Front pillar structure 214 Rib 216 Crevice 218 Expansion type silencer chamber 220 Expansion type silencer 312 Front pillar structure 314A Rib 316 Crevice 318 Expansion Mold silencer 320 expansion silencer 412 front pillar structure 414 rib 416 gap 418 expansion silencer chamber 420 expansion silencer 512 front pillar structure 612 front door structure 614 front door 616 door outer panel 618 door inner panel 620 door trim 622 gap 624A Rib 626A Gap 628 Inflatable silencer 630 Inflatable silencer

Claims (6)

A vehicle structural member that constitutes an outer shell of the vehicle and a part of which is an inner panel located on the vehicle interior side;
An inner member that covers the inner panel on the vehicle interior side of the inner panel and that forms a gap with the inner panel;
An inflatable mold that extends from an end of the inner member and has an extended end formed between the inner panel and a sound passage between the gap and the vehicle interior. An extension piece that constitutes a silencer chamber, and an inlet part and an outlet part that are arranged on both sides of the sound-passing direction of the expansion-type soundproofing room and have a cross-sectional area through which the sound passes are narrower than those of the expansion-type soundproofing room;
Vehicle structure having The inner member has a continuous shape along the inner panel;
The said extended piece is continuously formed along the longitudinal direction of the said edge part of the said inner member, The said expansion | swelling type silencing chamber is made into the shape continued along the said longitudinal direction. Vehicle structure described in 1. In the gap, a sound absorbing material disposed in the center between one and the other end of the inner member,
The vehicle structure according to claim 1 or claim 2, comprising: A part of a vehicle constituent member constituting the vehicle is accommodated in the gap to be a accommodated member,
The vehicle structure according to any one of claims 1 to 3, wherein the extending piece extends from the inner member on the end side of the accommodated member.   The vehicle structure according to any one of claims 1 to 4, wherein an expansion coefficient that is a ratio of the cross-sectional area of the expansion type silencing chamber to the cross-sectional area of the gap is 20 or more. The vehicle component is a pillar provided with a pillar inner panel as the inner panel,
The vehicle structure according to any one of claims 1 to 5, wherein the inner member is a pillar garnish disposed closer to the vehicle interior side than the pillar inner panel.