JP6485527B1 - Vehicle body structure - Google Patents

Abstract

An object of the present invention is to provide a vehicle body structure provided with a joint that suppresses an excessive increase in rigidity and has both appropriate rigidity and high damping characteristics.
The vehicle body structure includes a floor panel 6 constituting the vehicle body 1, a cross member 5 joined to the upper surface of the floor panel 6 via a first joint portion 20b, and a second surface on the lower surface of the floor panel 6. The second joint 20c includes a damping second adhesive 22 that joins both the frame 7 and the floor panel 6 to join the frame 7 and the frame 7 joined via the joint 20c. The second joint portion 20c includes a second joint intersection portion Q2 that overlaps the first joint portion 20b, and a second joint portion that is adjacent to the second joint portion intersection portion Q2 and does not overlap the first joint portion 20b. Adjacent portions R21 and R22, and the amount of adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q2 is the unit area of the second adhesive 22 in the second joint adjacent portions R21 and R22. Winning contact Characterized in that less than agent amount.
[Selection] Figure 6

Description

  The present invention relates to a vehicle body structure of a vehicle.

  2. Description of the Related Art Conventionally, vibration transmission is suppressed by using a damping member at a joint portion of a member constituting a vehicle body of a vehicle, and swinging of a vehicle body component member is suppressed.

  For example, in a vehicle front body structure including a front window panel and a cowl panel that supports the front window panel from below, a damping member is provided at a joint between the front window panel and the cowl panel, and the front window panel Has been disclosed (see Patent Document 1).

JP 2014-151657 A

  By the way, when the adhesive is uniformly arranged in such a joint, the rigidity is excessively increased in a portion where the joints of a plurality of members overlap, and the vibration damping property in a specific frequency band uses the adhesive. There was a problem that it worsened compared with the case where there was not.

  Accordingly, an object of the present invention is to provide a vehicle body structure including a joint portion that suppresses an excessive increase in rigidity and can achieve both high rigidity and high rigidity.

  In order to achieve the above object, in the present invention, the adhesive amount of the attenuating adhesive in the portion where the joint portions of a plurality of members overlap is reduced as compared with the adhesive amount in other portions.

  That is, the vehicle body structure disclosed herein includes a panel member constituting the vehicle body, a first rigid member joined to one surface of the panel member via a first joint portion, and a second surface on the other surface of the panel member. And a second rigid member joined via two joints, wherein the second joint is bonded to both the second rigid member and the panel member, thereby attenuating the adhesive. And the second junction includes a second junction intersection that overlaps the first junction, and a second junction that is adjacent to the second junction intersection and does not overlap the first junction. An adhesive amount per unit area of the adhesive at the second joint crossing portion is smaller than an adhesive amount per unit area of the adhesive at the second joint adjacent portion. It is characterized by that.

  In the part where multiple joints overlap, if all of these members are joined using an adhesive, the rigidity increases excessively, and even if a damping adhesive is used, vibration transmission to the panel member is rather performed. As a result, vibration damping in a specific frequency band can be reduced. According to this configuration, it is possible to suppress an extreme increase in rigidity at the second joint crossing portion, and to suppress a decrease in vibration attenuation in a specific frequency band at the second joint crossing portion. Thus, vibration transmission from the second rigid member to the panel member and the first rigid member can be suppressed.

  Preferably, the second rigid member is a long member, the second joint portion is formed to extend in a longitudinal direction of the second rigid member, and the adhesive is the second joint portion. In the portions other than the intersecting portions, they are continuously arranged along the extending direction of the second joint portion.

  According to this structure, even if it is a 2nd junction part with a narrow width | variety, adhesive force can be made to act uniformly over the wide range of a 2nd junction part, and even if an external force acts locally, 2nd joining Since it can disperse | distribute over the whole region of a part, the rigidity of a vehicle body can be improved.

  Preferably, the first joint portion and / or the second joint portion includes a pair of opposed joint portions arranged to face each other with a predetermined interval, and a closed cross section is provided between the pair of opposed joint portions. A structure is formed.

  According to this configuration, the rigidity of the vehicle body structure can be increased by forming a closed cross-sectional structure between the pair of opposed joint portions.

  Preferably, the first rigid member and / or the second rigid member is a long member having a hat-shaped cross section, and the first rigid member and / or the second rigid member are the first rigid member and / or the second rigid member, respectively. A pair of flange portions provided substantially in parallel to each other so as to extend in the longitudinal direction at both ends in the width direction of the second rigid member, and the pair of opposed joint portions are configured such that the pair of flange portions is the panel member A closed cross-sectional structure constituted by the first rigid member and / or the second rigid member and the panel member is formed between the pair of opposed joint portions.

  According to this configuration, a closed cross-sectional structure is formed by the first rigid member and / or the second rigid member and the panel member, so that the rigidity of the vehicle body structure can be increased.

  Preferably, in the second joint portion, the adhesive is provided along an edge portion of the opposing joint portion facing the inside of the closed cross-sectional structure.

  According to this configuration, when an external force such as a torsional force is applied to the closed cross-sectional structure, it is possible to prevent the opposing joint from opening and deforming, so that the rigidity can be increased structurally.

  Preferably, the panel member is a floor panel constituting a cabin of the vehicle body, the first rigid member is a cross member for reinforcing the floor panel, and the second rigid member is a frame of the vehicle body. It is.

  According to this configuration, since a highly rigid and highly attenuating joint can be provided in the vehicle body structure that forms the lower part of the passenger compartment of the vehicle body, comfort can be improved while ensuring vehicle body strength.

  Preferably, the frame is formed on the lower side of the floor panel so as to extend in the vehicle front-rear direction, and the cross member is formed on the upper side of the floor panel so as to cross the frame and extend in the vehicle width direction. In addition, a plurality of adhesives are provided in the vehicle front-rear direction, and a plurality of adhesives per unit area of the adhesive at the intersections of the second joints located at both ends of the floor panel in the vehicle front-rear direction. Is less than the amount of adhesive per unit area of the adhesive at the intersection of the second joints located on the center side of the floor panel.

  The front side and the rear side of the floor panel can be an input source of vibrations transmitted from the engine or wheel to the floor panel via the front panel, rear panel, and frame. If it does so, if the rigidity of the junction part of a front side and a rear side becomes high too much, it will be difficult to ensure attenuation. According to this configuration, the adhesive amount of the adhesive at the second joint crossing portion located on the front side and the rear side of the floor panel is set to be equal to that of the adhesive at the second joint crossing portion located on the center side of the front panel. By making it less than the amount of adhesive, it is possible to effectively suppress the transmission of vibrations, and to improve comfort while ensuring the strength of the vehicle body.

  Preferably, the frame is formed on the lower side of the floor panel so as to extend in the vehicle front-rear direction, and the cross member is formed on the upper side of the floor panel so as to cross the frame and extend in the vehicle width direction. In addition, a plurality of sensors are provided apart from each other in the vehicle front-rear direction. When an external force is applied to the floor panel from the front side and / or the rear side, the vibration amplitude of the vehicle front-rear direction transmitted to the floor panel is increased. The adhesive amount per unit area of the adhesive at the second joint crossing portion close to the position of the adhesive is bonded per unit area of the adhesive at the second joint crossing portion far from the antinode position of the amplitude. Less than the dosage.

  It is particularly desirable to suppress vibration transmission at the second junction crossing portion close to the position of the amplitude antinode because the amplitude becomes maximum at the antinode of the amplitude of vibration. According to this configuration, vibration transmission can be effectively suppressed by reducing the amount of adhesive per unit area of the adhesive at the second joint crossing portion closer to the position of the antinode of amplitude.

The first pre-junctional SL may also be provided with an adhesive for additional attenuation which joined together by adhering to both of said panel member and the first rigid member.

  According to this configuration, it is possible to increase the bonding strength of the first bonding portion and increase the rigidity of the vehicle body.

Before Symbol first rigid member is an elongated member, said first junction, the so formed as to extend in the longitudinal direction of the first rigid member, the additional adhesive, said first bonding portion It may be arranged continuously along the extending direction.

  According to this structure, even if it is a 1st junction part with a narrow width | variety, adhesive force can be made to act uniformly over the wide range of a 1st junction part. As a result, even when an external force is applied locally to the first joint portion, the external force can be smoothly dispersed over the entire area of the joint portion, so that the rigidity of the vehicle body can be increased.

  The adhesive has the characteristics that the storage elastic modulus is in the range of 100 MPa to 800 MPa and the loss coefficient is 0.2 or more under the condition that the frequency of the excitation force is 60 Hz at a temperature of 20 ° C. It is desirable.

  According to this configuration, by using an adhesive having specific physical properties, it is possible to achieve both high rigidity and high attenuation, and it is possible to easily improve the riding comfort and reduce noise.

  In addition, the adhesive has a storage elastic modulus in the range of greater than 500 MPa and less than or equal to 600 MPa and a loss factor of 0.3 or more under the condition that the frequency of the excitation force is 60 Hz at a temperature of 20 ° C. It is desirable to have

  According to this configuration, the loss factor can be significantly increased while ensuring high rigidity, so that both higher rigidity and higher attenuation can be achieved.

  Preferably, the first joint portion includes a damping additional adhesive that joins both the first rigid member and the panel member to join the first rigid member and the panel member. Or the said 2nd junction part is a combined use structure with a spot welding and / or mechanical joining means.

  The first joint portion and / or the second joint portion may be appropriately combined with a combined structure of an adhesive and spot welding (weld bond bonding), a combined structure of an adhesive and mechanical bonding means, or a combined structure of these. Thus, it is possible to achieve both higher rigidity and higher attenuation.

  Preferably, the first rigid member and / or the second rigid member is a long member, and the first joint portion and / or the second joint portion are the adhesive and / or the additional adhesive. In addition to joining by the above, both the first rigid member and / or the second rigid member and the panel member are arranged at intervals in the extending direction of the first rigid member and / or the second rigid member. Are provided with a plurality of spot joints formed by being partially welded to each other.

  According to this structure, the 1st junction part and / or the 2nd junction part were equipped with the some spot junction part arrange | positioned at intervals in the extending direction of the 1st rigid member and / or the 2nd rigid member. By adopting weld bond bonding, it is possible to significantly increase the loss factor while ensuring high rigidity, and it is possible to easily improve riding comfort and reduce noise.

  Preferably, the interval between the spot joints is set within a range of 10 mm to 100 mm.

  If the distance between the spot joints is too narrow, the influence of rigidity due to the joint becomes large, and the vibration damping effect of the adhesive part where the adhesive is present is hindered. Moreover, when the space | interval of a spot junction part is too wide, the influence of the rigidity by joining will become small, the burden to an adhesion part will increase, and there exists a possibility that the rigidity as the whole junction part may fall. According to this configuration, by setting the distance between the spot joints in the above-described range, the adhesive part having rigidity and damping property and the spot joint part having excellent rigidity are in a state of appropriately complementing each other. It is possible to stably achieve both high rigidity and high attenuation.

  Preferably, at least one of the panel member and the first rigid member in the first joint and / or at least one of the panel member and the second rigid member in the second joint is thinner than 2 mm. Have

  Along with the rigidity of the adhesive, the joint portion of the member thinner than 2 mm is appropriately bent and deformed, and accordingly, a load such as shear is input to the adhesive disposed in the joint portion, and the adhesive is By deforming, an effect of improving attenuation can be obtained while reducing weight.

  As described above, according to the present invention, both high rigidity and high damping can be achieved in the vehicle body structure. As a result, it is possible to easily improve the ride comfort and reduce the noise while ensuring the necessary vehicle strength, thereby improving the comfort of the vehicle.

It is the schematic which looked at the vehicle body from the left side. It is the schematic which looked at the vehicle body from the downward direction. It is a schematic perspective view which shows the 1st junction part of a cross member and a floor panel. It is a schematic perspective view which shows the 2nd junction part of a floor panel and a flame | frame. FIG. 3 is a schematic enlarged view of a portion indicated by reference sign D in FIG. 2. It is sectional drawing in the D1-D1 line | wire of FIG. It is a side view which shows roughly the mode of vibration of the vehicle body structure of the vehicle lower part. In the structure of Example 1 and Comparative Examples 1 and 2, it is a graph which shows the frequency dependence of the acoustic radiation power of the floor panel at the time of the vibration input from a rear panel. FIG. 4 is a view corresponding to FIG. 3 illustrating a vehicle body structure according to Embodiment 2. FIG. 5 is a view corresponding to FIG. 4 illustrating a vehicle body structure according to Embodiment 2. FIG. 6 is a view corresponding to FIG. 5 of a vehicle body structure having a configuration in which a second adhesive is uniformly applied to the entire second joint portion. It is sectional drawing in the D1-D1 line | wire of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

(Embodiment 1)
<Body structure>
1 and 2 show a vehicle body 1 of an automobile (vehicle) to which the vehicle body structure according to the disclosed technology is applied. FIG. 1 is a view of the vehicle body 1 viewed from the left side, and FIG. 2 is a view of the vehicle body 1 viewed from below.

  In this specification, the direction is based on the vehicle body 1. That is, as shown in FIG. 1, the “front-rear direction” and the “vertical direction” are the same as the vehicle front-rear direction and the vehicle vertical direction, respectively. The “front side” may be referred to as “front side” and the “rear side” may be referred to as “rear side”. Further, as shown in FIG. 2, the “left-right direction” is the same direction as the vehicle width direction, with the front side of the page of FIG. 1 being the left side and the back side being the right side.

  The front part of the vehicle body 1 mainly constitutes an engine room, and the rear part of the vehicle body 1 mainly constitutes a trunk room. A passenger compartment 2 that accommodates an occupant is constituted by an intermediate portion of the vehicle body 1 in the front-rear direction. Side sills 3 and 3 extending in parallel in the front-rear direction are disposed on the left and right sides of the lower middle portion of the vehicle body 1. A tunnel rain 4 is arranged at the center in the vehicle width direction between the side sills 3 and 3 so as to extend in the front-rear direction.

  A plurality of cross members 5 (first rigid members) extending in the vehicle width direction are joined to the left and right side sills 3 and 3 so as to cross the tunnel rain 4. A floor panel 6 (panel member) is disposed at the lower middle portion of the vehicle body 1 and below the cross members 5 so as to cover the floor surface of the passenger compartment 2. The cross member 5 is joined to the floor panel 6 to reinforce the floor panel 6.

  The front end portion of the floor panel 6 is joined to the front panel 10 located at the front lower part of the vehicle body 1. The rear end portion of the floor panel 6 is joined to the rear panel 11 located at the lower rear portion of the vehicle body 1. A pair of left and right frames 7 (second rigid members) are joined to the lower side of the floor panel 6 and extend in the vehicle front-rear direction. The frame 7 is joined to the lower side of the front panel 10 on the front side of the front end of the floor panel 6 and to the lower side of the rear panel 11 on the rear side of the rear end of the floor panel 6. The frame 7 is joined to the floor panel 6, the front panel 10, and the rear panel 11 to reinforce them.

  The floor panel 6, the side sill 3, the tunnel rain 4, the cross member 5, the frame 7, the front panel 10 and the rear panel 11 (hereinafter, these members may be collectively referred to as “vehicle body constituent members”). By joining, the vehicle body structure which supports the lower part of the compartment 2 is comprised.

<Joint part>
Let the joint part of the said vehicle body structural member be the junction part 20. As shown in FIG. The joint part 20 includes a first joint part 20b and a second joint part 20c as described below.

-First joint-
In FIG. 3, the 1st junction part 20b of the cross member 5 and the floor panel 6 is shown. The cross member 5 is formed by joining a cross member main body 51, which is a long member having a hat-shaped cross section, to the upper surface (one surface) of the floor panel 6 via the first joint portion 20b. The cross member main body 51 includes a strip plate-shaped main wall 51a, a pair of side walls 51b, 51b that are connected to both side edges of the main wall 51a in the state of being opposed to each other, and the protruding ends of the side walls 51b. A pair of flange portions 51c and 51c projecting in the opposite directions over the entire length.

  Each of the flange portions 51c and 51c is provided substantially in parallel with each other so as to extend in the longitudinal direction at both ends in the width direction of the cross member main body 51, and the floor is formed by the damping first adhesive 21 (additional adhesive). It is joined to the upper surface of the panel 6. That is, the 1st junction part 20b is comprised by the flange parts 51c and 51c, the floor panel 6, and the 1st adhesive agent 21 which joins both by adhere | attaching both. And the 1st junction part 20b comprises a pair of opposing junction part extended in parallel so that it may oppose at predetermined intervals. A closed cross-sectional structure is formed by the main panel 51 a and the pair of side walls 51 b and 51 b of the cross member main body 51 and the floor panel 6 between the pair of opposing joints. By forming the closed cross-sectional structure, the rigidity of the vehicle body 1 is structurally enhanced.

  In addition, in the 1st junction part 20b formed so that it may extend in the longitudinal direction of the cross member 5, the 1st adhesive agent 21 is continuous along the extension direction of the 1st junction part 20b, as shown in FIG. Is arranged.

  The flange portion 51c of the cross member main body 51 can be formed to be elongated with a narrow width. For this reason, in order to achieve both high rigidity and high attenuation in a stable manner, it is preferable that a uniform bonding state is provided over the entire area of the first bonding portion 20b. Therefore, in the 1st junction part 20b, the 1st adhesive agent 21 is provided in the connected state, without interrupting substantially in the extension direction of the 1st junction part 20b.

  With this configuration, even when the width of the first joint portion 20b is narrow, a uniform adhesive force can be ensured over a wide range of the first joint portion 20b. Thus, even when an external force is applied locally to the first joint portion 20b, the external force can be smoothly dispersed over the entire area of the first joint portion 20b, so that the rigidity of the vehicle body 1 can be increased. it can.

  Moreover, as shown in FIG. 3, you may make it provide the 1st adhesive agent 21 along the edge which faces the inner side of the closed cross-section structure of the 1st junction part 20b. Then, when external force such as torsional force is applied to the closed cross-sectional structure, it is possible to prevent the first joint portion 20b from opening and progressing deformation, so that the rigidity can be increased structurally.

-Second joint-
In FIG. 4, the 2nd junction part 20c of the floor panel 6 and the flame | frame 7 is shown. Similar to the cross member 5, the frame 7 is formed by joining a frame main body 71, which is a long member having a hat-shaped cross section, to the lower surface (other surface) of the floor panel 6. The frame main body 71 includes a strip-shaped frame main wall portion 71a, a pair of frame side wall portions 71b and 71b that are continuous with each other on both side edges of the frame main wall portion 71a in a state of being opposed to each other, and each frame side wall portion 71b. A pair of frame flange portions 71c and 71c projecting in the opposite directions over the entire length from the protruding end.

  Each of the frame flange portions 71c and 71c is provided substantially in parallel with each other so as to extend in the longitudinal direction at both ends in the width direction of the frame main body 71, and the floor panel is formed by the damping second adhesive 22 (adhesive). 6 is joined. That is, the 2nd junction part 20c is comprised by frame flange part 71c, 71c, the floor panel 6, and the 2nd adhesive agent 22 which joins both by adhere | attaching both. Thus, the second joint portion 20c constitutes a pair of opposing joint portions that extend in parallel so as to face each other at a predetermined interval. A closed cross-sectional structure is formed by the frame main wall 71a and the pair of frame side walls 71b and 71b of the frame main body 71 and the floor panel 6 between the pair of opposing joints. By forming the closed cross-sectional structure, the rigidity of the vehicle body 1 is structurally enhanced.

  Note that in the second bonding portion 20c formed so as to extend in the longitudinal direction of the frame 7, the second adhesive 22 has a portion other than the second bonding portion intersecting portion described later, as shown in FIG. It arrange | positions continuously along the extension direction of the junction part 20c.

  Similarly to the flange portions 51c and 51c of the cross member 5, the frame flange portions 71c and 71c may be formed to be elongated with a narrow width. Therefore, the second adhesive 22 is substantially interrupted in the extending direction of the second joint portion 20c from the viewpoint of dispersing the adhesive force at the second joint portion 20c and stably achieving both high rigidity and high attenuation. It is preferable that they are provided in a continuous state without being connected, and a uniform joining state is provided over the entire area of the second joining portion 20c.

  Also in the second joint portion 20c, as in the first joint portion 20b, as shown in FIG. 5, the second adhesive 22 may be provided along the edge facing the inside of the closed cross-sectional structure. . Then, when an external force such as a torsional force is applied to the closed cross-sectional structure, it is possible to prevent the second joint 20c from opening and progressing the deformation, so that the rigidity can be increased structurally.

-Adhesive-
Since the joint portion 20 is required to have high rigidity from the need to ensure the strength of the vehicle body, it is common to use an adhesive having a highly rigid physical property such that the storage elastic modulus exceeds 1500 MPa, for example. On the other hand, generally, the higher the rigidity, the easier the transmission of vibrations. Therefore, from the viewpoint of realizing a comfortable riding comfort by suppressing the transmission of vibrations generated when the automobile is running, the vehicle body 1, particularly a vehicle in which a passenger is accommodated. It is desirable to use an adhesive having a damping property that can attenuate vibration while ensuring high rigidity for the joint portion 20 constituting the chamber 2.

  However, since the loss coefficient of the adhesive having a storage elastic modulus generally employed exceeding 1500 MPa is approximately 0.05, the damping effect obtained with respect to the vibration of the vehicle body 1 cannot be obtained.

  In this regard, the inventors of the present application show that the reduction in rigidity of the joint portion 20 of the member constituting the vehicle body 1 is 20% even when the storage elastic modulus of the adhesive is lowered from about 2000 MPa to about 100 MPa by CAE analysis. I found that it stopped to the extent. It was also found that if the storage modulus is higher than 500 MPa, there is almost no difference in the rigidity of the joint 20.

  If the storage modulus can be reduced, the loss factor can be increased. For example, if the storage elastic modulus is 500 MPa, the loss coefficient can be 0.4 or more. Therefore, high attenuation can be realized.

  Based on this knowledge, a damping adhesive having specific physical properties is used as the first adhesive 21 and the second adhesive 22 in the joint portion 20 of the vehicle body 1. Specifically, an adhesive having a storage elastic modulus in a range of 100 MPa to 800 MPa and a loss coefficient of 0.2 or more under a condition in which a vibration force frequency is 60 Hz at a temperature of 20 ° C. Is used.

  Here, 20 degreeC is the temperature corresponding to normal temperature, and represents standard temperature conditions, when specifying the physical property of an adhesive agent. The excitation force with a frequency of 60 Hz corresponds to vibrations that are likely to cause discomfort to the occupant. By realizing high damping under these conditions, the comfort (NVH) of the automobile can be improved. .

  By using the adhesive having the above-mentioned physical properties for the joint portion 20, it becomes possible to achieve both high rigidity and high damping in the vehicle body 1, thereby improving the ride comfort while ensuring the vehicle body strength. Noise reduction can be realized.

  The storage elastic modulus is preferably in the range of 300 MPa to 700 MPa, more preferably in the range of 450 MPa to 600 MPa, and further in the range of greater than 500 MPa to 600 MPa or less from the viewpoint of obtaining the highly rigid and highly damped joint 20. The inside is even more preferable.

  The loss factor is preferably 0.3 or more, more preferably 0.2 or more, and more preferably 0.4 or more. The higher the loss factor, the higher the vibration damping effect, so that the comfort can be further improved.

-Other configurations-
As shown in FIGS. 3 and 4, a part of the adhesive may protrude from the edge of the joint 20. If it does so, when apply | coating an adhesive agent to the junction part 20, even if some dispersion | variation generate | occur | produces in an application amount and an application position, an adhesion part can be stably provided along the edge of the junction part 20. Therefore, opening of the mouth can be suppressed with higher accuracy.

  Further, at least one of the vehicle body constituting members constituting the joint portion 20 can be configured to have a thickness smaller than 2 mm. Specifically, for example, at least one of the floor panel 6 and the cross member 5 in the first joint 20b and at least one of the floor panel 6 and the frame 7 in the second joint 20c are configured to have a thickness of less than 2 mm. can do.

  When the thickness of both of the vehicle body constituting members constituting the joint portion 20 is 2.0 mm or more, when an external force such as torsion is applied to the joint portion 20, the rigidity of the vehicle body constituent member becomes the stiffness of the adhesive. Too much. As a result, the vehicle body constituting member is appropriately bent and hardly deformed with the rigidity of the adhesive, and the above-described attenuation improvement effect cannot be obtained.

  On the other hand, when at least one of the two vehicle body constituting members constituting the joint portion 20 is thinner than 2 mm, at least the thickness of the vehicle body constituting member is thinner than 2 mm due to the rigidity of the adhesive. Since the vehicle body constituent member on the side is appropriately bent and deformed, a load such as shearing is input to the adhesive disposed in the joint portion 20 accordingly, and the above-described effect of improving the damping property is obtained. As the thickness of the vehicle body constituent member is thinner, an increase in the improvement rate of attenuation can be expected, which is advantageous from the viewpoint of reducing the member cost and the vehicle body weight.

  The connecting part between the side sill 3 and the floor panel 6, the connecting part between the tunnel rain 4 and the floor panel 6, the connecting part between the front panel 10 or the rear panel 11 and the floor panel 6, and the like are also attenuating adhesive. It is joined by.

<Laminated part>
As shown in FIG. 2, the frame 7 is formed so as to extend below the floor panel 6 in the vehicle front-rear direction, and the cross member 5 crosses the frame 7 above the floor panel 6 in the vehicle width direction. It is formed to extend.

  2 is a portion in which the cross member 5, the floor panel 6, and the frame 7 overlap each other in the vertical direction. FIG. 5 shows a schematic enlarged view of the portion indicated by the symbol D. As shown in FIG. In FIG. 5, the second adhesive 22 is indicated by hatching for the sake of understanding, and the first adhesive 21 is not indicated for simplicity. FIG. 6 is a sectional view taken along line D1-D1 of FIG.

  As shown in FIGS. 5 and 6, the portions where the cross member 5, the floor panel 6 and the frame 7 overlap in the vertical direction are the flange portions 51 c and 51 c of the cross member main body 51, the floor panel 6, and the frame main body 71. The frame flange portions 71c, 71c are stacked in the vertical direction to form a stacked portion Q. In other words, the stacked portion Q is a portion where the first joint portion 20b and the second joint portion 20c overlap.

  The second joint portion 20c overlaps with the first joint portion 20b and forms the laminated portion Q. The second joint portion intersecting portion Q2 is adjacent to the second joint portion intersecting portion Q2 and overlaps with the first joint portion 20b. The non-laminated adjacent portion R21 and the stacked adjacent portion R22 (hereinafter, the non-laminated adjacent portion R21 and the stacked adjacent portion R22 as the second bonded portion adjacent portions that do not match may be referred to as “second bonded portion adjacent portions R21, R22”. .).

  The non-stacked adjacent portion R21 is a portion where the cross member 5 is not disposed on the upper surface side of the floor panel 6. Further, the stacked adjacent portion R22 is a portion where the main wall portion 51a of the cross member 5 and the pair of side wall portions 51b, 51b are arranged on the upper surface side of the floor panel 6, and the main wall portion 51a and the pair of side wall portions. It can be said that the second joint portion 20c is located at the portion of the floor panel 6 that forms the above-described closed cross-sectional structure together with 51b and 51b.

  Here, as shown in FIGS. 5 and 6, in the disclosed technology, the amount of adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q2 is equal to the second joint adjacent portions R21 and R22. The amount of the adhesive per unit area of the second adhesive 22 in FIG. Hereinafter, the function and effect will be described.

  11 and 12 show a state in which the second adhesive 22 is disposed in the entire area of the second joint 20c including the second joint crossing portion Q2. That is, the second adhesive 22 is continuously and uniformly arranged at the second junction crossing portion Q2 of the stacked portion Q in FIG. 6 as with the second junction adjacent portions R21 and R22.

  Thus, when the 2nd adhesive agent 22 is uniformly arrange | positioned over the whole region of the 2nd junction part 20c, the 1st adhesive agent 21 will be arrange | positioned in the part of the 1st junction part 20b located in the lamination | stacking part Q. Therefore, the rigidity in the longitudinal direction of the vehicle tends to increase excessively in the laminated portion Q. If the rigidity in the laminated portion Q is increased too much, the damping property in the laminated portion Q is lowered, and considering the vehicle longitudinal direction, for example, vibration transmission from the frame 7 to the floor panel 6 and the cross member 5 is promoted. Vibration damping in a specific frequency band can be reduced.

  On the other hand, as shown in FIGS. 5 and 6, according to the disclosed technique, the amount of the adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q <b> 2 is set to the second joint adjacent portion. By reducing the amount compared to R21 and R22, the adhesive force between the frame flange portion 71c and the floor panel 6 at the second joint crossing portion Q2 can be reduced. If it does so, the rigidity in the 2nd junction part crossing part Q2 will fall, the attenuation | damping property in the lamination | stacking part Q can be ensured, and also the vibration transmission from the frame 7 to the floor panel 6 or the cross member 5 can be suppressed. it can. As a result, comfort can be improved while ensuring vehicle body strength.

  In addition, about the adhesive amount per unit area of the 2nd adhesive agent 22, the adhesive amount of 2nd junction part cross | intersection part Q2 is preferably 50% or less of the adhesive amount of 2nd junction part adjacent part R21, R22, More preferably, it can be 40% or less, and more preferably 30% or less. In a particularly preferable aspect, as described later, the amount of adhesive at the second junction crossing portion Q2 may be zero.

  In this specification, the “adhesive amount per unit area” means, for example, the adhesive amount per unit area at an arbitrary position of the second joint crossing portion Q2, and, for example, four layers shown in FIG. It also includes an average value of the amount of adhesive per unit area in the entire second junction crossing portion Q2 in one of the portions Q. Specifically, for example, in one second joint crossing portion Q2, not only when the adhesive is uniformly applied, but also by applying the adhesive in a dot shape, for example, locally. Although there are locations where the amount of adhesive per area is large and locations where there is a small amount, the average value of one entire second joint crossing portion Q2 includes the case where the above-mentioned range of the amount of adhesive is satisfied. In addition, when it says an average value about the adhesive amount per unit area in 2nd junction part adjacent part R21, R22, the area of 2nd junction part intersection part Q2 of the location adjacent to 2nd junction part intersection part Q2 and The average value of the amount of adhesive per unit area of a portion having an equivalent area shall be said.

  In addition, a plurality of second joint crossing portions Q2 can be formed in one vehicle body 1, but the amount of adhesive in all of the plurality of second joint crossing portions Q2 does not have to be the same. The amount of adhesive can be appropriately increased or decreased depending on the position of the part intersection part Q2.

  Specifically, as shown in FIG. 2, a plurality of cross members 5 (two in the present embodiment) are provided apart from each other in the vehicle front-rear direction, and the stacked portions Q are also formed at a plurality of locations. Therefore, the second junction crossing portion Q2 is also present at a plurality of locations.

  FIG. 7 is a view schematically showing how the floor panel 6 and the cross member 5 vibrate when an external force is applied to the front panel 10 and the rear panel 11. For simplicity, the frame 7 is not shown.

  In FIG. 7, the broken line indicates the configuration before the external force is applied, and the solid line indicates the configuration when the external force is applied from the front side and the rear side. As indicated by white arrows S1 and S2 in FIG. 7, when an external force is applied to the front panel 10 and the rear panel 11 from the lower side, for example, vibrations in the front-rear direction transmitted from the front panel 10 and the rear panel 11 are denoted by the signs H1 and H2. The panel joint portion 20a at the position indicated by the black arrow is input to the floor panel 6 as an entrance and transmitted to the floor panel 6, and may become an antinode of the amplitude at the positions indicated by the black arrows at T1 and T3. That is, the amplitude of the floor panel 6 can be larger at the positions indicated by the black arrows indicated by the reference signs T1 and T3 than at the position indicated by the black arrow indicated by the reference sign T2.

  Then, the amount of adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q2 close to the position of the amplitude antinode is set to the second adhesive portion crossing portion Q2 in the other second joint crossing portion Q2 far from the position of the amplitude antinode. It is effective from the viewpoint of suppressing vibration transmission to reduce the amount of adhesive per unit area of the two adhesives 22. Specifically, for example, the amount of adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q2 formed in the second joint 20c of the cross member 5 near the position indicated by the symbol T3 in FIG. Is preferably smaller than the amount of adhesive per unit area of the second adhesive 22 in the second joint crossing portion Q2 formed in the second joint 20c close to the position indicated by the symbol T2.

  Further, the front side and the rear side of the floor panel 6 can serve as an input source of vibrations transmitted to the floor panel 6 from an engine, suspension, etc. (not shown) via the front panel 10, the rear panel 11, and the frame 7. If it does so, if the rigidity of the junction part 20 located in a front side and a rear side becomes high too much, it will become difficult to ensure a damping property.

  Therefore, the amount of the adhesive per unit area of the second adhesive 22 at the second junction crossing portion Q2 located on both ends in the vehicle front-rear direction of the floor panel 6, that is, the front side and the rear side is the center of the floor panel 6. You may set so that it may become smaller than the adhesive amount per unit area of the 2nd adhesive agent 22 of the 2nd junction part intersection part Q2 located in the side. Thereby, transmission of vibration can be effectively suppressed, and comfort can be improved while securing vehicle body strength.

  In addition, from the viewpoint of suppressing vibration transmission from the frame 7 to the floor panel 6 and the cross member 5 and achieving both high rigidity and high attenuation, the second adhesive 22 is used as the second joint portion as shown in FIG. It is preferable to adopt a configuration that is not disposed at the intersection portion Q2.

  FIG. 8 shows the result of calculating the floor acoustic radiation power with respect to the frequency using CAE analysis for the vibration transmitted to the floor panel 6 when the vibration input from the rear panel 11 is assumed in the configuration shown in FIG.

  In FIG. 8, in Comparative Example 1 indicated by a one-dot chain line, when the first adhesive 21 and the second adhesive 22 are not arranged in the first joint 20b and the second joint 20c, Comparative Example 2 indicated by a broken line is As shown in FIGS. 11 and 12, when the first adhesive 21 and the second adhesive 22 are uniformly arranged over the entire area of the first joint 20b and the second joint 20c, the first embodiment indicated by the solid line is as follows. As shown in FIGS. 5 and 6, the results are obtained when the amount of adhesive of the second adhesive 22 in all the second joint crossing portions Q2 is zero.

  As shown in FIG. 8, in the vicinity of the frequency band 245 Hz to 270 Hz, it can be seen that in the first comparative example to the second comparative example, the floor acoustic radiation power is significantly reduced and the vibration transmitted to the floor panel 6 is reduced. On the other hand, in the vicinity of the frequency band 310 Hz, it can be seen that the floor acoustic radiation power is increased in Comparative Example 2 as compared with Comparative Example 1, and the vibration transmitted to the floor panel 6 is increased. And in Example 1, it turns out that the increase in the floor acoustic radiation power of the frequency band 310Hz vicinity is suppressed compared with the comparative example 2. FIG.

  In this way, by adopting a configuration in which the second adhesive 22 is not disposed at all at the second joint crossing portion Q2, it is possible to secure the damping property at the joint 20 and suppress the vibration transmission to the floor panel 6. .

(Embodiment 2)
Hereinafter, other embodiments according to the present invention will be described in detail. In the description of these embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the vehicle body constituent members in the first joint portion 20b and the second joint portion 20c are joined to each other by an adhesive, but the joint portion 20 including these is joined by an adhesive, A combined structure with spot welding and / or mechanical joining means may be used.

  Specifically, for example, as shown in FIG. 9, the first joint portion 20 b is disposed at an interval in the extending direction of the flange portions 51 c and 51 c of the cross member 5, and the flange portions 51 c and 51 c of the cross member 5 are disposed. A plurality of spot joints 27 may be provided that are configured by partially welding the floor panel 6 and the floor panel 6 together. Moreover, as shown in FIG. 10, it is good also as a structure provided with the above several spot junction parts 27 also in the 2nd junction part 20c similarly to the 1st junction part 20b.

  The combined structure of the adhesive and the spot joint 27 is a so-called weld bond joint. By adopting such a weld bond joint to the joint 20, it becomes possible to greatly increase the loss factor while ensuring high rigidity, so that it is possible to easily improve riding comfort and reduce noise. Become.

  The spot joint 27 which is a partial joint structure in the weld bond joint may be formed by welding (that is, spot welding) as described above, and is not limited to spot welding but may be a spot joint structure. For example, mechanical joining means such as SPR (self-piercing rivet) may be used. In addition, the joint portion 20 takes into consideration the arrangement in the vehicle body 1, necessary rigidity, damping properties, and the like, and includes only an adhesive, a combined structure of adhesive and spot welding, and a combined structure of adhesive and mechanical joining means. These may be combined as appropriate.

  Further, from the viewpoint of stably achieving both high rigidity and high attenuation of the vehicle body 1, as shown in FIGS. 9 and 10, the interval P between the spot joints 27 is set within a range of 10 mm to 100 mm. Is preferable, and it is more preferable to set within the range of 15 mm to 70 mm, and even more preferable to set within the range of 25 mm to 50 mm.

  If the distance P between the spot joint portions 27 is too narrow, the influence of the rigidity due to the joint becomes large, and the vibration damping effect of the adhesive portion composed of the adhesive and the spot joint portion 27 is hindered. Moreover, if the space | interval P of the spot junction part 27 is too wide, the rigidity improvement effect by joining will become small, the burden to an adhesion part will increase, and there exists a possibility that the rigidity as the whole junction part 20 may fall.

  On the other hand, by setting the interval P between the spot joint portions 27 within the above-described range, the adhesive having rigidity and damping property and the spot joint portion 27 having excellent rigidity are in a state of appropriately complementing each other. It is possible to stably achieve both high rigidity and high attenuation.

(Other embodiments)
The disclosed technology is not limited to the above-described embodiment, and includes other various configurations.

  For example, the adhesive does not necessarily have to be provided along the edge of the joint 20. In the case where it is not preferable that the adhesive protrudes from the edge of the joint 20 from the viewpoint of ensuring aesthetics, the adhesive can be provided so as to be located at the back from the edge of the joint. In addition, the disclosed technology is applicable not only to joint portions of vehicle body constituent members such as the cross member 5, the floor panel 6, the frame 7, the front panel 10, and the rear panel 11, but also to other joint portions constituting the vehicle body. .

  In the above-described embodiment, the configuration using the adhesive is employed as the bonding method of the bonding portion 20, but if the second adhesive 22 is used for bonding the second bonding portion 20c, A bonding method other than an adhesive may be used for the other bonding portion 20. Specifically, for example, the bonding of the first bonding portion 20 b is replaced by, for example, spot welding instead of the bonding by the first adhesive 21. Or the structure using the joining only by a mechanical joining means may be sufficient. That is, the present disclosure technique can be widely applied regardless of the joining method of the joint portion 20 other than the second joint portion 20c.

  The present invention is extremely useful in the field of vehicle body structures.

1 Car body 2 Car compartment 3 Side sill 4 Tunnel rain 5 Cross member (first rigid member)
6 Floor panels (panel members)
7 Frame (2nd rigid member)
DESCRIPTION OF SYMBOLS 10 Front panel 11 Rear panel 20b 1st junction part 20c 2nd junction part 21 1st adhesive agent (additional adhesive agent)
22 Second adhesive (adhesive)
27 Spot joint portion 51 Cross member main body 51b Side wall portion 51c Flange portion 71 Frame main body 71a Frame main wall portion 71b Frame side wall portion 71c Frame flange portion Q Laminated portion Q2 Second joint crossing portion R21 Non-laminated adjacent portion (second joint portion) Adjacent part)
R22 Laminate adjacent part (second joint adjacent part)

Claims (14)

A panel member constituting the vehicle body;
A first rigid member joined to one surface of the panel member via a first joint;
A second rigid member joined to the other surface of the panel member via a second joint,
The second joint portion includes a dampening adhesive that joins both the second rigid member and the panel member to join both,
The second junction includes a second junction intersection that overlaps with the first junction, and a second junction adjacent portion that is adjacent to the second junction intersection and does not overlap with the first junction. Prepared,
The vehicle is characterized in that an adhesive amount per unit area of the adhesive in the second joint crossing portion is smaller than an adhesive amount per unit area of the adhesive in the adjacent portion of the second joint. Car body structure. The vehicle body structure according to claim 1,
The second rigid member is a long member,
The second joint portion is formed to extend in the longitudinal direction of the second rigid member,
The vehicle body structure according to claim 1, wherein the adhesive is continuously disposed along the extending direction of the second joint at portions other than the second joint intersection. In the vehicle body structure according to claim 1 or 2,
The first joint portion and / or the second joint portion includes a pair of opposed joint portions arranged to face each other with a predetermined interval therebetween,
A vehicle body structure for a vehicle, wherein a closed cross-sectional structure is formed between the pair of opposed joint portions. In the vehicle body structure according to claim 3,
The first rigid member and / or the second rigid member is a long member having a hat-shaped cross section,
The first rigid member and / or the second rigid member are a pair of flanges provided substantially in parallel to each other so as to extend in the longitudinal direction at both ends in the width direction of the first rigid member and / or the second rigid member, respectively. Department,
The pair of opposed joint portions are formed by joining the pair of flange portions to the panel member.
A vehicle body structure for a vehicle, wherein a closed cross-sectional structure constituted by the first rigid member and / or the second rigid member and the panel member is formed between the pair of opposed joint portions. The vehicle body structure according to claim 4,
The vehicle body structure of a vehicle according to claim 2, wherein the adhesive is provided along an edge of the opposing joint facing the inner side of the closed cross-section structure in the second joint. In the vehicle body structure according to any one of claims 1 to 5,
The panel member is a floor panel constituting a casing of the vehicle body,
The first rigid member is a cross member for reinforcing the floor panel;
The vehicle body structure of a vehicle, wherein the second rigid member is a frame of the vehicle body. The vehicle body structure according to claim 6,
The frame is formed to extend in the vehicle front-rear direction below the floor panel,
The cross member is formed on the upper side of the floor panel so as to cross the frame and extend in the vehicle width direction, and is provided in a plurality spaced apart in the vehicle front-rear direction.
The amount of adhesive per unit area of the adhesive at the second junction crossing portion located on both ends of the floor panel in the vehicle front-rear direction is the second junction crossing located on the center side of the floor panel. The vehicle body structure of a vehicle, wherein the amount of the adhesive per unit area of the adhesive in the portion is smaller. The vehicle body structure according to claim 6,
The frame is formed to extend in the vehicle front-rear direction below the floor panel,
The cross member is formed on the upper side of the floor panel so as to cross the frame and extend in the vehicle width direction, and is provided in a plurality spaced apart in the vehicle front-rear direction.
When the external force is applied to the floor panel from the front side and / or the rear side, the unit of the adhesive at the second joint crossing portion close to the position of the antinode of the vibration in the vehicle longitudinal direction transmitted to the floor panel The vehicle body structure of a vehicle, wherein the amount of adhesive per area is smaller than the amount of adhesive per unit area of the adhesive at the intersection of the second joints far from the position of the antinode of the amplitude. In the vehicle body structure of the vehicle according to any one of claims 1 to 8 ,
The adhesive has the characteristics that the storage elastic modulus is in the range of 100 MPa to 800 MPa and the loss coefficient is 0.2 or more under the condition that the frequency of the excitation force is 60 Hz at a temperature of 20 ° C. A vehicle body structure, characterized in that The vehicle body structure according to claim 9 ,
The adhesive has the characteristics that the storage elastic modulus is in the range of more than 500 MPa to 600 MPa and the loss coefficient is 0.3 or more under the condition that the frequency of the excitation force is 60 Hz at a temperature of 20 ° C. A vehicle body structure characterized by that. In the vehicle body structure of the vehicle according to any one of claims 1 to 10 ,
The first joint portion includes a damping additional adhesive that joins both of the first rigid member and the panel member to join the first rigid member and the panel member,
The vehicle body structure of a vehicle, wherein the first joint portion and / or the second joint portion is a combined structure with spot welding and / or mechanical joining means. The vehicle body structure according to claim 11 ,
The first rigid member and / or the second rigid member is a long member,
The first joint portion and / or the second joint portion is spaced in the extending direction of the first rigid member and / or the second rigid member in addition to the joining by the adhesive and / or the additional adhesive. Provided with a plurality of spot joints that are arranged by being partially welded to each other, and the first rigid member and / or the second rigid member and the panel member are arranged apart from each other. Characteristic vehicle body structure. The vehicle body structure according to claim 12 ,
A vehicle body structure for a vehicle, wherein an interval between the spot joints is set in a range of 10 mm to 100 mm. In the vehicle body structure according to any one of claims 1 to 13 ,
At least one of the panel member and the first rigid member in the first joint and / or at least one of the panel member and the second rigid member in the second joint has a thickness less than 2 mm. A vehicle body structure characterized by that.

Images