JP6079298B2 - Vehicle body structure - Google Patents

Description

  In this invention, a closed cross section formed by a first vehicle body member and a second vehicle body member such as a vehicle floor frame, a side sill, a pillar, a roof rail, and a floor cross member is coupled and disposed so as to cover the closed cross section. The present invention relates to a vehicle body structure having a node member functioning as a partition wall.

  In general, a vehicle frame such as a floor frame, a side sill, a pillar, a roof rail, a floor cross member, etc. has a closed cross-section between the first and second vehicle body members to secure rigidity. It is formed as follows. In the vehicle body member having such a closed cross section, various techniques are known that are configured to suppress vibration transmitted to the vehicle frame in order to improve riding comfort.

  For example, Patent Document 1 functions as a node member inside a closed cross-section portion of a frame member composed of a skeleton member that is a first vehicle body member having a hat-shaped cross section and a secondary material that is a second vehicle body member having a panel shape. There is disclosed a structure in which a partition wall member is provided, and a flange portion formed integrally with the partition wall member is combined with an inner wall portion of a first vehicle body member having a hat-shaped cross section to increase the rigidity of the frame member.

JP 2006-131125 A

  In the conventional structure disclosed in Patent Document 1, the transmission of vibration is suppressed to some extent by suppressing the collapse of the cross section of the closed cross section by the partition member functioning as the above-mentioned node member and increasing the rigidity of the frame member. it can. However, there is a limit to the method of simply increasing the rigidity disclosed in Patent Document 1, and a new method is desired to further improve the vibration transmission suppression effect.

  In response to this, the inventors of the present application have the first vehicle body member and the node member at the joint portion between the inner wall portion of the closed cross section formed by the first vehicle body member and the second vehicle body member and the node member. The viscoelastic member contacts the second vehicle body member and the flange portion in a gap formed by a predetermined distance apart between the rigid coupling portion that is rigidly connected in contact with the second vehicle body member and the flange portion of the node member. The present inventors have found a new method of providing a soft coupling portion disposed so as to be in contact with each other. As a result, in addition to the effect of suppressing vibration transmission by improving the rigidity of the closed cross section, the vibration energy of the closed cross section is converted into heat energy and dissipated by the viscoelastic member of the flexible coupling portion, resulting in high vibration damping. An effect is obtained. As a result, the vibration of the vehicle body structure is suppressed, and the riding comfort of the vehicle can be improved.

  Therefore, the above-described vehicle body structure is usually manufactured as follows. First, a node member is rigidly connected to the first vehicle body member by welding or the like. Then, the paste-like viscoelastic member is applied to the flange portion of the node member, and the second vehicle body member and the flange portion of the node member are overlapped by a predetermined distance while pressing the viscoelastic member with the second vehicle body member. Then, the first vehicle body member and the second vehicle body member are joined to form a closed cross section. Thereafter, as shown in FIG. 9, in the electrodeposition coating process for rust prevention, the vehicle body (work W) is usually immersed in the electrodeposition liquid 71 for about 5 minutes while moving in the electrodeposition tank 70 in the direction of arrow Z. . Finally, the above-described vehicle body structure is obtained by heating and solidifying the viscoelastic member in a heating and drying furnace. At this time, in order to express the vibration damping effect of the flexible coupling portion, a predetermined thickness is required for the viscoelastic member. Therefore, in the overlapping process of the second vehicle body member and the flange portion of the joint member described above, It is necessary to overlap the two with a predetermined distance so that the vibration damping effect can be exhibited.

  However, it has been found that the following new problem occurs when the second vehicle body member and the flange portion of the node member are separated from each other by a predetermined distance as described above. That is, the paste-like viscoelastic member is used in the circumferential direction of the closed cross-section portion of the flange portion of the node member (arrow X in FIG. 10) in the same manner as the structural adhesive for forming a rigid coupling portion generally used in a vehicle body. When the coating is applied in a long shape along the direction), there is a gap separated by a predetermined distance as described above, so that the dent shape due to variations in the application amount of the viscoelastic member and the application route remains as it is after the formation of the closed cross section. May be. That is, as shown in FIG. 10, a space (so-called air pocket P) surrounded by the panel member 20, the flange portion 54 of the node member, and the viscoelastic member 60 may be generated. At this time, when the frame member 40 of FIG. 10 is immersed in the electrodeposition liquid, and the electrodeposition liquid flows into the closed cross section and flows in the arrow Y direction due to the presence of the first body member and the second body member, In the pocket P, air is difficult to escape and the panel member 20 around the air pocket P is not sufficiently immersed in the electrodeposition liquid. As a result, there is a possibility that an undeposited portion that is not subjected to electrodeposition coating is generated due to non-immersion and the rust prevention of the panel member 20 is insufficient. In the case of a structural adhesive generally used in a vehicle body, since it is applied to a portion having substantially no gap, the above-described problems are unlikely to occur.

  Therefore, an object of the present invention is to provide a vehicle body structure of a vehicle that can effectively suppress the transmission of vibration without generating an air pocket in the flexible coupling portion.

  In order to solve the above problems, the present invention is configured as follows.

  First, the invention of the present application is a vehicle body structure to which an electrodeposition coating is applied, and a closed cross section is formed between the first vehicle body member and the first vehicle body member coupled to the first vehicle body member. And a node member coupled to the first vehicle body member and the second vehicle body member so as to cover the closed cross section. The node member includes a flange portion having a predetermined width facing the second vehicle body member with a predetermined distance, a node body formed integrally with the flange portion and facing the closed section, and formed on the node body. A coupling portion between the inner wall portion of the closed cross-sectional portion and the node member, and a rigid coupling portion coupled in a state where the first vehicle body member and the node member are in contact with each other. The flexible coupling portion includes a viscoelastic member disposed in a gap between the second vehicle body member and the flange portion so as to be in contact with the second vehicle body member and the flange portion. Is formed by disposing two or more viscoelastic members at spaced apart positions of the flange portion, and allows the electrodeposition liquid to pass between the two adjacent viscoelastic members together with the notch portion. The viscoelastic member is heated at a temperature of 20 ° C. Under conditions frequency force is 30 Hz, storage elastic modulus loss factor below 500MPa is characterized by having a 0.2 or more properties.

  Moreover, in this invention, the space part may be formed in the flange part located between the two viscoelastic members which the said soft coupling part adjoins.

The space portion, the flange portion located between the adjacent two viscoelastic member of the flexible joint portion can be formed by providing a switching output portion which part of the flange portion is cut out.

  In addition, the space portion can be formed by providing a stepped portion projecting inward of the closed cross-sectional portion at the flange portion positioned between two adjacent viscoelastic members of the flexible coupling portion. .

  With the above configuration, according to the present invention, the following effects can be obtained.

  First, the joint between the inner wall of the closed cross section and the node member is composed of a rigid joint and a flexible joint provided with a viscoelastic member. In addition, a high vibration damping effect is obtained by converting the energy of the closed cross section into heat energy and dissipating it by the viscoelastic member of the soft coupling portion. Thereby, the vibration of the vehicle body structure is suppressed, and the riding comfort of the vehicle can be improved.

  Further, since the two or more viscoelastic members are disposed at positions separated in the circumferential direction of the closed cross section of the flange portion in a state where the closed cross section is formed, each viscoelastic member is closed with the flange portion closed. An air pocket surrounded by the second vehicle body member, the flange portion of the node member, and the viscoelastic members is not formed between the viscoelastic members. This reduces the occurrence of non-electrodeposited portions in which the electrodeposition solution is not immersed in the electrodeposition coating in the subsequent step.

  Further, if a space portion is formed in the flange portion positioned between two adjacent viscoelastic members of the flexible coupling portion, the paste-like material applied to the flange portion of the node member at the time of manufacturing the vehicle body structure In the step of overlapping the second vehicle body member while pressing and expanding the viscoelastic member, it is possible to reliably prevent the adjacent viscoelastic members that have been spread apart from being fused.

Further, if the space portion is formed by providing a cutout portion formed by cutting out a portion between two adjacent viscoelastic members in the flange portion, a closed cross-section portion of the flange portion of the node member in the circumferential direction of the short length, and the gap between the adjacent viscoelastic member is narrow, the peripheral portions even each other closer to the pressing, a portion has reached the switching output of adjacent viscoelastic member, the closed Since it can escape to the inner side of the cross section, no air pocket is produced by the fusion of adjacent viscoelastic members.

Further, if the space portion is formed by providing a stepped portion projecting inward of the closed cross-sectional portion at the flange portion located between two adjacent viscoelastic members of the flexible coupling portion, a node member When the circumferential length of the closed section of the flange portion of the flange portion is short and the interval between adjacent viscoelastic members is narrow, even if the peripheral portions of adjacent viscoelastic members approach each other by pressing, the stepped portion Since the part which reached | attained can escape to the inward side of a closed cross-section part, the air pocket by the melt | fusion of adjacent viscoelastic members does not arise. Further, since the flange portion of the node member is continuous in the circumferential direction of the closed cross section, the rigidity of the flange portion of the node member is increased, and the second vehicle body member and the flange portion of the node member at the time of vibration input are approached. In deformation that repeats separation, it becomes difficult for the flange portion of the node member to follow the deformation of the second vehicle body member. As a result, the deformation amount of the viscoelastic member can be increased, and the vibration damping effect can be enhanced. it can.

1 is an exploded perspective view showing a first embodiment of the present invention. Plan view of FIG. Sectional drawing along the AA line in FIG. Explanatory drawing of deformation behavior at vibration input The perspective view which shows 2nd Embodiment. Sectional drawing which shows 2nd Embodiment The perspective view which shows 3rd Embodiment Sectional drawing which shows 3rd Embodiment Schematic configuration diagram of electrodeposition coating equipment A perspective view showing a comparative example (conventional structure)

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 is an exploded perspective view of a frame member 40 to which the vehicle body structure according to the first embodiment of the present invention is applied, FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view taken along line AA in FIG. In FIG. 1 to FIG. 3, a frame member 40 having a closed cross-section portion 30 formed by a cross-sectional hat-shaped member (first vehicle body member) 10 and a panel member (second vehicle body member) 20 as a flat plate is provided. 40 constitutes a vehicle body member, specifically a frame member under the floor panel of the vehicle.

  The cross-sectional hat-shaped member 10 includes a base wall 11, a pair of side walls 12 and 13 that are continuous with the base wall 11, and a flange portion 14 that extends outward from the end of the side walls 12 and 13 on the side opposite to the base wall. , 15 are integrally formed.

  As shown in FIG. 3, the frame member 40 described above is formed by joining the flange portions 14 and 15 of the cross-sectional hat-shaped member 10 and the panel member 20. Inside the frame member 40 having the closed cross-section portion 30 formed by two members (the cross-sectional hat-shaped member 10 and the panel member 20), a direction covering the closed cross-section portion 30, that is, the base wall 11 of the closed cross-section portion 30 and A node member 50 is provided in a direction substantially perpendicular to the side walls 12 and 13.

  As shown in FIGS. 1 and 3, the node member 50 includes a plate-shaped node body 51, rigid coupling flange portions 52 and 53 integrally formed on the left and right sides of the node body 51, and the node body 51. And a rigid coupling flange portion 54 that is integrally bent at the lower end portion. Further, the node member 50 is integrally formed with an upper end portion of the node body 51, and includes a flexible coupling flange portion 55 having a predetermined width facing the panel member 20 (second vehicle body member). Here, the rigid coupling flange portions 52 and 53 extend in a direction substantially parallel to the side walls 12 and 13 of the closed cross section 30, and the rigid coupling flange portion 54 is substantially parallel to the base wall 11 of the closed cross section 30. The flexible coupling flange portion 55 extends in a direction substantially parallel to the panel member 20. Further, node body notches 56 are formed at the four corners of the node body 51, respectively.

  As shown in FIG. 3, the rigid coupling flange portion 54 below the node member 50 is brought into contact with the inner wall portion of the base wall 11 of the cross-sectional hat-shaped member 10, and both these 55, 11 are attached to a plurality of spot welds a, a. Are combined. Further, as shown in FIG. 3, the rigid coupling flange portion 52 on one side of the node member 50 is brought into contact with the corresponding inner wall portion of the side wall 12 of the cross-sectional hat-shaped member 10, and both of these 52, 12 are connected to a plurality of members. They are joined at spot welds b and b.

Similarly, as shown in FIG. 3, the rigid coupling flange portion 53 on the other side of the first joint member 50 is brought into contact with the corresponding inner wall portion of the side wall 13 of the cross-sectional hat-shaped member 10, and both Are coupled by a plurality of spot welds c, c.

  In other words, the joint portion between the closed cross-section portion 30 and the node member 50 has a rigid joint portion that is joined in contact with each other. In this embodiment, each spot welded portion a, b, c is a rigid joint portion. Is formed. In addition, the number of the welding location by each spot welding part a, b, c is not limited to the number of the example of illustration. Moreover, as a rigid coupling part, it replaces with a spot welding part, the fastening part by a volt | bolt, a nut, etc. may be sufficient, or the adhesion part by an adhesive agent may be sufficient. Here, as an adhesive for the rigid coupling portion, a storage elastic modulus is a structural adhesive generally used in a vehicle body under a condition where the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz. A material having a pressure coefficient of 2000 MPa or more and a loss factor of 0.05 or less is used. Moreover, as a rigid coupling part, you may couple | bond the edge part of a node body with the inner wall part of a closed cross-section part by fillet welding etc., without passing through a rigid coupling flange part.

  Further, as shown in FIGS. 1 to 3, the first viscoelastic member 61 and the second viscoelastic member 62 are panel members in a gap formed by separating the panel member 20 and the flexible coupling flange portion 55 by a predetermined distance. 20 and the flexible coupling flange portion 55 are disposed so as to be in contact with each other. At this time, the first viscoelastic member 61 and the second viscoelastic member 62 are separated in the circumferential direction (arrow X direction) of the closed cross-section portion 30 of the flexible coupling flange portion 55 in a state where the closed cross-section portion 30 is formed. Arranged in position.

  In other words, the connecting portion between the closed cross-section portion 30 and the node member 50 has two or more viscoelastic members and the panel member 20 in a gap formed by separating the panel member 20 and the flexible connecting flange portion 55 from each other by a predetermined distance. In this embodiment, the first viscoelastic member 61 and the second viscoelastic member 62 form a soft coupling portion. . The number of viscoelastic members is not limited to the number in the illustrated embodiment, and may be three or more. Although the material of the 1st viscoelastic member 61 and the 2nd viscoelastic member 62 is not specifically limited, For example, a silicone type material or an acrylic material is used. Further, as the physical properties of the viscoelastic member, those having a storage elastic modulus of 500 MPa or less and a loss coefficient of 0.2 or more under conditions where the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz are used. Thus, vibration transmission can be effectively suppressed.

  And the 1st viscoelastic member 61 and the 2nd viscoelastic member 62 are in the position away in the circumferential direction (arrow X direction) of the closed cross-section part 30 of the flexible coupling flange part 55 in the state in which the closed cross-section part 30 was formed. It is arranged. Therefore, the 1st viscoelastic member 61 and the 2nd viscoelastic member 62 become a short shape in the circumferential direction of the closed cross-section part of a flange part, and it is between the 1st viscoelastic member 61 and the 2nd viscoelastic member 62. The panel member 20, the flexible coupling flange portion 55, the first viscoelastic member 61, and the second viscoelastic member 62 do not form a space that can be an air pocket. Thereby, in the electrodeposition coating process, the occurrence of an unelectrodeposited portion in which the electrodeposition liquid is not sufficiently immersed is reduced. Even when the frame member 40 is immersed in the electrodeposition liquid and the electrodeposition liquid flows in the direction of the arrow Y, in addition to the node main body notch 56, the first viscoelastic member 61 and the second viscoelastic member 62 Since the electrodeposition liquid 71 also passes in between, the immersion of the electrodeposition liquid into the inner wall portion of the frame member 40 is more reliably achieved.

  Here, the disposition of the first viscoelastic member 61 and the second viscoelastic member 62 at the above-described site is realized by, for example, applying both paste-like viscoelastic members 61 and 62 by dot application. In addition, it is preferable that the viscoelastic members 61 and 62 themselves are not formed with a concave shape that becomes an air pocket. However, by applying the above-described point application, the viscoelastic members 61 and 62 are not formed without forming a concave shape. It is possible to apply.

  FIG. 4 is an explanatory diagram of the deformation behavior of the frame member 40 during vibration input. When vibration of the engine or suspension is input to the frame member 40, the panel member 20 is deformed so as to alternately repeat the shape of the solid line and the shape of the phantom line in FIG. That is, the panel member 20 and the flexible coupling flange portion 55 are deformed so as to repeat approach and separation. Note that the deformed shapes of the solid line and the virtual line of the panel member 20 are exaggerated for easy understanding.

  By the way, the viscoelastic member attenuates vibration by absorbing vibration energy as strain energy, converting it into heat energy and dissipating it. At this time, it is desirable in terms of efficiency that the viscoelastic member is disposed at the site where the strain energy stored in the viscoelastic member is the largest, that is, the deformation amount is the largest. As shown in FIG. 4, in the vicinity of both ends in the circumferential direction (arrow X direction) of the closed cross-section portion 30 of the flexible coupling flange portion 55, the deformation amount due to the panel member 20 and the flexible coupling flange portion 55 being separated from each other is approached. The biggest. Therefore, it is possible to further enhance the vibration damping effect by disposing the viscoelastic member in the vicinity of both ends.

  FIG. 5 is a perspective view of a vehicle body structure according to a second embodiment of the present invention, and FIG. 6 relates to the second embodiment along the line corresponding to the AA line of FIG. 2 in FIG. It is sectional drawing of the vehicle body structure of a vehicle.

  The vehicle body structure according to the second embodiment is the same as the vehicle body structure according to the first embodiment except that the shape of the flexible coupling flange portion is different. The same components as those of the vehicle body structure are denoted by the same reference numerals, and detailed description thereof is omitted. The panel member 20 is not shown.

Body structure of a vehicle according to a second embodiment of the present invention shown in FIG. 5 has a flexible joint flange cut out portion 57 as the space in the flexible coupling flange 55. Flexible coupling flange cut out portion 57 includes a first viscoelastic member 61 located between the second viscoelastic member 62, a portion of the flexible coupling flange 55 both viscoelastic members 61 and 62 is not provided It is formed by cutting out.

When forming the flexible coupling portion by the panel member 20, the flexible coupling flange portion 55, and both the viscoelastic members 61, 62, the paste-like first viscoelastic member 61 and the second viscoelastic member 62 are coupled to the flexible coupling flange. After applying to the part 55, the panel member 20 is pressed on both the viscoelastic members 61 and 62 while being overlapped. At this time, since both the viscoelastic members 61 and 62 are spread out, the area in plan view of the both viscoelastic members 61 and 62 after pressing becomes larger than before pressing. At this time, when the interval between the adjacent first viscoelastic member 61 and the second viscoelastic member 62 is short, the first viscoelastic member 61 and the second viscoelastic member 62 having a substantially circular shape or a substantially elliptical shape in plan view. There is a possibility that the end portions of the two are fused together to form an air pocket. However, since it is formed space S by flexible coupling flange cut out portion 57 of the flexible coupling flange 55 located between the first viscoelastic member 61 and the second viscoelastic member 62, the first viscoelastic member 61 and also the peripheral portions of the second viscoelastic member 62 is accessed by pressing the above, the portion has reached the flexible joint flange cut out portion 57, escapes to the inner side of the closed-section portion (the base wall 11 side) Therefore, an air pocket due to fusion of the first viscoelastic member 61 and the second viscoelastic member 62 does not occur.

  FIG. 7 is a perspective view of the vehicle body structure of the vehicle according to the third embodiment of the present invention, and FIG. 8 relates to the third embodiment along the line corresponding to the AA line of FIG. 2 in FIG. It is sectional drawing of the vehicle body structure of a vehicle.

  The vehicle body structure of the vehicle according to the third embodiment is the same as the vehicle body structure of the vehicle according to the first embodiment except that the shape of the flexible coupling flange portion is different. The same components as those of the vehicle body structure are denoted by the same reference numerals, and detailed description thereof is omitted. The panel member 20 is not shown.

  The vehicle body structure according to the third embodiment of the present invention shown in FIG. 7 has a flexible coupling flange portion 55 with a flexible coupling flange step portion 58 as a space portion. The flexible coupling flange step portion 58 is located between the first viscoelastic member 61 and the second viscoelastic member 62, and a part of the flexible coupling flange portion 55 where the both viscoelastic members 61 and 62 are not disposed. It is formed by projecting to the inner side (base wall 11 side) of the closed section.

  As in the second embodiment described above, the space portion S is formed by the soft coupling flange stepped portion 58, so that the peripheral portions of the first viscoelastic member 61 and the second viscoelastic member 62 are pressed by the above-described pressing. Even if it approaches, the portion that has reached the soft coupling flange stepped portion 58 can escape to the inner side (base wall 11 side) of the closed cross-sectional portion, so the first viscoelastic member 61 and the second viscoelastic member 62 No air pockets are generated due to the fusion.

  Further, since the flexible coupling flange portion 55 is continuous without being interrupted in the circumferential direction (arrow X direction) of the closed cross section, the rigidity of the flexible coupling flange portion 55 can be increased. By increasing the rigidity of the flexible coupling flange portion 55, in the deformation in which the second vehicle body member and the flange portion of the node member repeat approach and separation at the time of vibration input as shown in FIG. It becomes difficult to follow the deformation of the panel member 20, and as a result, it becomes possible to increase the amount of deformation when the panel member 20 and the flexible coupling flange portion 55 approach and separate, and the vibration damping effect can be enhanced.

  The present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention.

  For example, as the panel member 20, a flat plate member is illustrated, but this may be a member having a hat-shaped cross section like the cross-sectional hat-shaped member 10. Moreover, although the 1st vehicle body member and the 2nd vehicle body member illustrated the integral member, respectively, these may consist of two or more members. Further, the direction of the flexible coupling flange portion 55 in the vehicle body structure of the vehicle may include a horizontal direction, a vertical direction, and a direction inclined from the horizontal or vertical direction. Since the air pocket is relatively unlikely to occur when the direction is the vertical direction, the present invention is particularly useful when the circumferential direction of the closed section 30 of the flexible coupling flange portion 55 is other than the vertical direction.

  As described above, the present invention covers a closed cross-sectional portion formed by a first vehicle body member and a second vehicle body member such as a floor frame, a side sill, a pillar, a roof rail, and a floor cross member. It is useful for a vehicle body structure of a vehicle having a node member that functions as a partition wall that is coupled to the vehicle.

10. Cross-sectional hat-shaped member (first body member)
14, 15 ... Flange 20 ... Panel member (second body member)
21 ... inner wall portion 30 ... closed sectional 40 ... frame member 50 ... section member 51 ... section main body 55 ... flexible coupling flange portion 57 ... flexible coupling flange cut out portion 58 ... flexible coupling flange stepped portion 60 ... the viscoelastic member (the flexible joint Part)
61 ... 1st viscoelastic member (soft coupling part)
62 ... 2nd viscoelastic member (soft coupling part)
70 ... Electrodeposition tank 71 ... Electrodeposition liquid P ... Air pocket S ... Space part W ... Workpiece (vehicle body)
X: Circumferential direction of closed cross section Y: Flow direction of electrodeposition liquid Z: Movement direction of workpiece (vehicle body) a, b, c ... Spot welded portion (rigidly connected portion)

Claims (5)

A vehicle body structure with electrodeposition coating,
A first vehicle body member;
A second vehicle body member coupled to the first vehicle body member to form a closed cross section with the first vehicle body member;
A node member coupled to the first vehicle body member and the second vehicle body member so as to cover the closed cross section;
With
The node member is
A flange portion having a predetermined width opposed to the second vehicle body member by a predetermined distance;
A node body formed integrally with the flange portion and facing the closed cross-section portion;
A notch formed in the node body;
Have
The connecting portion between the inner wall portion of the closed section and the node member is:
A rigid coupling portion coupled in a state where the first vehicle body member and the node member are in contact with each other;
A viscoelastic member is formed in a gap between the second vehicle body member and the flange portion, and a flexible coupling portion is disposed so as to contact the second vehicle body member and the flange portion.
The flexible coupling portion is configured by disposing two or more viscoelastic members at spaced positions of the flange portion,
Along with the notch, the electrodeposition liquid can pass between the two adjacent viscoelastic members,
The viscoelastic member has a physical property that the storage elastic modulus is 500 MPa or less and the loss coefficient is 0.2 or more under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz .
The space part which prevents the fusion | melting of the said viscoelastic member is formed by providing the cut-out part formed by cutting the part between the two said viscoelastic members adjacent in the said flange part. A vehicle body structure characterized by. A vehicle body structure with electrodeposition coating,
A first vehicle body member;
A second vehicle body member coupled to the first vehicle body member to form a closed cross section with the first vehicle body member;
A node member coupled to the first vehicle body member and the second vehicle body member so as to cover the closed cross section;
With
The node member is
A flange portion having a predetermined width opposed to the second vehicle body member by a predetermined distance;
A node body formed integrally with the flange portion and facing the closed cross-section portion;
A notch formed in the node body;
Have
The connecting portion between the inner wall portion of the closed section and the node member is:
A rigid coupling portion coupled in a state where the first vehicle body member and the node member are in contact with each other;
A viscoelastic member is formed in a gap between the second vehicle body member and the flange portion, and a flexible coupling portion is disposed so as to contact the second vehicle body member and the flange portion.
The flexible coupling portion is configured by disposing two or more viscoelastic members at spaced positions of the flange portion,
Along with the notch, the electrodeposition liquid can pass between the two adjacent viscoelastic members,
The viscoelastic member has a physical property that the storage elastic modulus is 500 MPa or less and the loss coefficient is 0.2 or more under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz .
Preventing fusion of the viscoelastic members by providing a stepped portion projecting inward of the closed cross-section portion in the flange portion between the two adjacent viscoelastic members in the flange portion A vehicle body structure characterized in that a space portion is formed .   The said soft coupling | bond part is comprised by arrange | positioning in the state by which the two or more said viscoelastic members by which point application was carried out were spread in the space | interval position of the said flange part. 2. A vehicle body structure according to the item 2. A first vehicle body member; a second vehicle body member coupled to the first vehicle body member to form a closed cross-section between the first vehicle body member; and a flange portion having a predetermined width facing at least the second vehicle body member And a node member coupled and arranged so as to cover the closed cross-sectional portion by including a coupling portion coupled to each inner wall portion of the two vehicle body members on the closed cross-section portion side. A vehicle body structure,
The connecting portion between the inner wall portion of the closed section and the node member is:
A rigid coupling portion rigidly coupled in a state where the first vehicle body member and the node member are in contact with each other;
Two or more viscoelastic members are arranged in contact with the second vehicle body member and the flange portion, respectively, in a gap formed by separating the second vehicle body member and the flange portion of the node member by a predetermined distance. Made of soft joints,
The two or more viscoelastic members of the flexible coupling portion are disposed at positions spaced apart in the circumferential direction of the closed cross-sectional portion of the flange portion in a state where the closed cross-sectional portion is formed,
The flange portion located between the adjacent two viscoelastic member of the flexible joint portion, by providing the switching output portion a part of which is formed by cut of the flange portion, fusion of each other the viscoelastic member A vehicle body structure characterized in that a space for preventing wearing is formed. A first vehicle body member; a second vehicle body member coupled to the first vehicle body member to form a closed cross-section between the first vehicle body member; and a flange portion having a predetermined width facing at least the second vehicle body member And a node member coupled and arranged so as to cover the closed cross-sectional portion by including a coupling portion coupled to each inner wall portion of the two vehicle body members on the closed cross-section portion side. A vehicle body structure,
The connecting portion between the inner wall portion of the closed section and the node member is:
A rigid coupling portion rigidly coupled in a state where the first vehicle body member and the node member are in contact with each other;
Two or more viscoelastic members are arranged in contact with the second vehicle body member and the flange portion, respectively, in a gap formed by separating the second vehicle body member and the flange portion of the node member by a predetermined distance. Made of soft joints,
The two or more viscoelastic members of the flexible coupling portion are disposed at positions spaced apart in the circumferential direction of the closed cross-sectional portion of the flange portion in a state where the closed cross-sectional portion is formed,
Providing a stepped portion projecting inward of the closed cross-section portion at the flange portion located between two adjacent viscoelastic members of the flexible coupling portion prevents fusion of the viscoelastic members. A vehicle body structure having a space formed therein.

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