JP5223573B2 - Automobile roof structure - Google Patents

Description

  The present invention relates to a roof structure of an automobile in which an upper surface of a rectangular area whose outer periphery is partitioned by left and right roof side rails, a front header, and a rear header is covered with a roof panel.

  Conventionally, as shown in Patent Document 1 below, a hydraulic damping force generating means that is formed in an elongated shape and generates a damping force against deformation in the longitudinal direction thereof, and both end portions of the hydraulic damping force generating means are provided. A vehicle body reinforcement device including a plurality of reinforcement device bodies formed in a rod shape by attachment means attached to the body frame, wherein the plurality of reinforcement device bodies are substantially bilaterally symmetrical on the vehicle body front side of the body frame. 4 attachments consisting of a left front attachment part and a right front attachment part positioned so as to be, and a left rear attachment part and a right rear attachment part located so as to be substantially symmetrical on the rear side of the vehicle body frame. There is known a vehicle body reinforcement device that is arranged in an X shape in plan view between parts and is detachably attached from the lower side to a position exposed to the outside of the passenger compartment at the lower part of the vehicle body frame. To have.

Further, as shown in Patent Document 2 below, a roof panel of an automobile vehicle, which has a flange panel that extends at an angle from the roof panel and provides a mounting surface, and a side body of the automobile vehicle A side body panel having a flange that extends from the side body panel at an angle to provide a mounting surface; and is bonded to the mounting surface of the roof panel and the mounting surface of the side panel; A structural adhesive material that is a foam for a system structure, and a sealant material that seals a gap between the roof panel and the side panel, and the mounting surface of the body panel faces the mounting surface of the side panel And hiding the structural adhesive material so that the sealant material is not visible from the environment around the vehicle. An automobile vehicle configured such that the agent material or both is substantially the only mounting portion between the mounting surface of the roof panel and the mounting surface of the side panel without assistance from a welding portion between the mounting surfaces. Mounting mechanisms are known.
JP 2007-203896 A JP 2004-131062 A

  In the vehicle body reinforcing device disclosed in Patent Document 1, the vibration of the vehicle body that occurs after the vehicle body is elastically deformed due to vehicle acceleration / deceleration, turning, riding over a protrusion, etc. is caused by the hydraulic damping force generating means. Because it is attenuated, the speed of deformation when the vehicle body is elastically deformed can be reduced, overshoot can be prevented during elastic deformation of the vehicle body, and when an impact load is applied to the vehicle body There is an advantage that the ride comfort can be improved. However, since it is necessary to provide the hydraulic damping force generating means comprising an expensive damper in which gas or oil is sealed in the cylinder tube, there is an inevitable problem that the manufacturing cost increases and the weight of the vehicle body increases. There is.

  In addition, in the mounting mechanism for an automobile vehicle disclosed in Patent Document 2, the roof of the automobile vehicle is bonded to one or more body panels of the vehicle with a structural adhesive that is an epoxy-based structural foam. There is an advantage that an attachment mechanism can be obtained. However, this mounting mechanism cannot reduce low-frequency vibration or the like generated between the roof panel and the roof side rail due to the vehicle body being deformed so as to be twisted when the vehicle is running. There was a problem that the ride comfort could not be improved effectively.

  The present invention has been made in view of the above-described problems, and is an automobile that can effectively reduce low-frequency vibration generated between a roof panel and a roof side rail with a simple configuration and improve riding comfort. The object is to provide a roof structure.

The invention according to claim 1 includes a pair of left and right front pillars extending from the vehicle body front waistline toward the roof, a pair of left and right rear pillars extending from the vehicle body rear waistline toward the roof, and the left and right sides of the roof. A pair of left and right roof side rails extending in the longitudinal direction of the vehicle body, a front header member extending in the vehicle width direction so as to connect the front end portions of the left and right roof side rails, and the rear end portions of the left and right roof side rails. Including a rear header member extending in the vehicle width direction so as to be coupled, and a roof panel covering the upper surface of the rectangular area defined by the four sides on the left and right roof side rails, the front header, and the rear header. The side part is overlapped with the flange part provided on the center side of the roof side rail in the vehicle width direction and fixed. A roof part structure of an automobile having a roof side joint part, wherein the roof side joint part has left and right roof panels formed of an elastically deformable adhesive having a Young's modulus at a temperature of 20 ° C. of 500 MPa or less. An elastic adhesive portion is provided in which both side portions and the flange portion of the roof side rail are joined, and the front and rear end portions of the roof side joint portion are relatively easily displaced in the shearing direction as compared to the central portion in the front and rear direction. In the aspect, the adhesive is applied, and the elastic adhesive portions are disposed only at the front and rear end portions of the roof side joint portion, and the left and right side portions of the roof panel are disposed at the front and rear center portions of the roof side joint portion. And a spot welded portion in which the flange portion of the roof side rail is spot welded at a predetermined interval .

According to a second aspect of the present invention, in the roof structure of an automobile according to the first aspect, the thickness of the adhesive at the front and rear end portions of the roof side joint portion is larger than that of the center portion in the front and rear direction of the roof side joint portion. The above-mentioned adhesive is applied in such a way that it becomes larger.

According to a third aspect of the present invention, in the roof structure of an automobile according to the first or second aspect , the area of the adhesive at the front and rear end portions of the roof side joint portion is the center portion in the front and rear direction of the roof side joint portion. The adhesive is applied in a manner that is narrower than the above.

In the invention according to claim 1, an adhesive having a characteristic of Young's modulus of 500 MPa or less at a temperature of 20 ° C. is applied to the elastic adhesive portion of the roof side joint portion, and the front and rear end portions of the roof side joint portion are in the front-rear direction. Since the coating is applied in such a manner that it can be relatively displaced in the shearing direction as compared with the central portion, for example, according to the torsional vibration force so as to alternately twist and displace the vehicle body with the center line extending in the front-rear direction through the center of gravity of the vehicle as When a load is applied in a direction in which the corners of the roof panel supported by the pillars and the rear pillars are alternately displaced toward the center side and the outer side of the vehicle body, the adhesive is elastically deformed to By absorbing the vibration displacement energy and transmitting the load to the roof panel with a predetermined phase delay, The low-frequency vibrations efficiently attenuated to thereby effectively improve the riding comfort of the vehicle.
In particular, the elastic adhesive portions are disposed only at the front and rear end portions of the roof side joint portion, and the left and right side portions of the roof panel and the flange portions of the roof side rail are disposed at the front and rear center portion of the roof side joint portion. Since the spot welded part is formed by spot welding at predetermined intervals, the roof panel and the roof pillars are connected to the roof panel through the front pillars and the rear pillars, etc. while maintaining sufficient bonding strength between the roof panel and the roof side rail. There is an advantage that it is possible to effectively attenuate the traveling vibration transmitted.

In the invention according to claim 2 , since the adhesive is applied in such a manner that the thickness of the adhesive at the front and rear end portions of the roof side joint portion is larger than that of the center portion in the front and rear direction of the roof side joint portion, Efficient vibration displacement generated at the corners of the roof panel supported by the front and rear pillars according to the torsional vibration force acting to alternately twist and displace the vehicle body with the center line extending in the front-rear direction through the center of gravity There is an advantage that it can be attenuated well and the riding comfort of the vehicle can be effectively improved.

In the invention according to claim 3 , since the adhesive is applied in such a manner that the area of the adhesive at the front and rear end portions of the roof side joint portion is narrower than that of the center portion in the front and rear direction of the roof side joint portion, Efficient vibration displacement generated at the corners of the roof panel supported by the front and rear pillars according to the torsional vibration force acting to alternately twist and displace the vehicle body with the center line extending in the front-rear direction through the center of gravity There is an advantage that it can be attenuated well and the riding comfort of the vehicle can be effectively improved.

  1 and 2 show a schematic configuration of a vehicle body provided with an automobile roof structure according to a first embodiment of the present invention. The vehicle includes a pair of left and right front pillars 1 extending obliquely rearward from the front of the waistline of the vehicle body toward the roof, a front window glass 2 having left and right sides supported by the left and right front pillars 1, and a vehicle body. A pair of left and right rear pillars 3 extending from the rear of the waistline toward the roof, a rear window glass 4 or a back door having left and right sides supported by the left and right rear pillars 3, and the left and right sides of the roof A pair of left and right roof side rails 5 extending in the front-rear direction, a front header member 6 extending in the vehicle width direction so as to connect the front end portions of the left and right roof side rails 5, and the rear end portions of the left and right roof side rails 5 A rear header member 7 extending in the vehicle width direction so as to connect the left and right roof side rails 5 and the front header member 6. The outer peripheral portion by the rear header member 7 and has a roof panel 8 covering the upper surface of the rectangular region partitioned.

  As shown in FIG. 3, the roof side rail 5 includes a rail outer panel 9 and a rail inner panel 10, and a rail reinforcement 11 disposed between the panels 9 and 10. And the flange part 12 is provided in the vehicle width direction center part side of the said roof side rail 5 toward the inward side of a vehicle body substantially horizontally, and the both right and left sides of the said roof panel 8 are provided in this flange part 12. The roof side coupling portion 14 is configured by overlapping and fixing the portion 13.

  As shown in FIG. 4, the roof side joint portion 14 is provided between elastic adhesive portions 15 provided at both front and rear end portions thereof, and between the elastic adhesive portions 15 and 15, and in the front and rear direction of the roof side joint portion 14. It consists of a spot weld 16 disposed in the center. The elastic adhesive portion 15 displaces the flange portion 12 along the roof panel 8 in such a manner that the front and rear end portions of the roof side joint portion 14 are relatively easily displaced in the shearing direction as compared with the central portion in the front-rear direction. Even if the load acting in the direction is the same, the following adhesive is applied in such a manner that the front and rear end portions of the roof side joint portion 14 are significantly displaced relative to the center portion in the front and rear direction. .

  That is, the elastic adhesive part 15 has a Young's modulus at a temperature of 20 ° C. of 500 MPa or less and a loss coefficient of 0.1 or more at the left and right side parts 13 of the roof panel 8 and the flange part 12 of the roof side rail 5. It is formed by bonding with an elastically deformable adhesive 17 having characteristics. An elastic adhesive portion 15 to which the adhesive 17 is applied is disposed only on the front and rear end portions of the roof side joint portion 14, and the roof side joint portion 14 has the roof in the front and rear direction central portion. A spot welded portion 16 in which the left and right side portions 13 of the panel 8 and the flange portion 12 of the roof side rail 5 are spot-welded at a predetermined interval, that is, a joint portion having a greater joint strength than the elastic adhesive portion 15 is provided. . As described above, the elastic adhesive portions 15 having a bonding strength smaller than that of the spot welded portion 16 are provided only at the front and rear end portions of the roof side joint portion 14, so that the front and rear end portions of the roof side joint portion 14 are disposed. The application area | region of the said adhesive agent 17 is set so that it may become easy to carry out relative displacement in the shear direction compared with the center part in the front-back direction.

  When Young's modulus of each adhesive at a temperature of 20 ° C. was measured by experiment, data as shown in FIG. 5 was obtained. From this data, an epoxy resin-based semi-structured adhesive, for example, trade name “AD Sealer” manufactured by Sunstar Giken Co., Ltd. or trade name “EP001” manufactured by Cemedine Co., Ltd., or an elastomer-based (rubber-based) adhesive, For example, a trade name “Penguin Seal” manufactured by Sunstar Giken Co., Ltd. has a Young's modulus of 500 MPa or less at a temperature of 20 ° C., and an epoxy resin-based adhesive, for example, trade name “Sunstar Giken Co., Ltd. Since the Young's modulus is smaller than that of the comparative example consisting of “Penguin Cement” or the trade name “EP008” or “EP330” manufactured by Cemedine Co., Ltd., it can be seen that it has a characteristic of being greatly elastically deformed even with a light load.

  Moreover, when the loss coefficient of each adhesive at a temperature of 20 ° C. was measured with a dynamic viscoelasticity measuring device, the adhesive for epoxy resin-based semi-structure consisting of the trade name “AD Sealer” manufactured by Sunstar Giken Co., Ltd. was used. It was confirmed that the agent has an extremely large loss factor compared to other adhesives. The loss factor is a value represented by the ratio (K ″ / K ′) of the loss elastic modulus K ″ to the storage elastic modulus K ′ in the kinematic viscosity characteristic diagram shown in FIG. As the vibration energy is sufficiently absorbed, that is, the damping function is increased.

  Therefore, it is an adhesive for epoxy resin semi-structure consisting of the trade name “AD Sealer” manufactured by Sunstar Giken Co., Ltd., having a Young's modulus at a temperature of 20 ° C. of 500 MPa or less and a loss factor of 0.1 or more. By using an elastically deformable adhesive 17 having characteristics for the elastic adhesive portion 15, the left and right side portions 13 of the roof panel 8 and the roof according to the load input to the roof side joint portion 14. It can be seen that the vibration can be effectively damped by sufficiently displacing the flange portion 12 of the side rail 5 and at the same time sufficiently exhibiting the damping action.

  Here, the Young's modulus and the loss factor are characteristics depending on the temperature of the adhesive, the frequency acting on the adhesive, and the amplitude. In this embodiment, the temperature is 20 ° C. as a representative value when the vehicle is used. A frequency of 15 Hz and an amplitude of 0.1 mm are set. Even in the case of an automobile in use, even when the temperature of the adhesive is away from 20 ° C, the adhesive properties, generally the loss factor, etc., do not drop sharply, and the damping action is not lost immediately. Absent.

  As shown in FIG. 7, the front header member 6 is formed of a hat-shaped member having a front flange portion 18 and a rear flange portion 19 joined to the lower surface of the roof panel 8, and the front flange member 18 includes a roof panel. The front coupling | bond part 21 is comprised because the front-end part 20 of 8 is piled up and fixed. Further, as shown in FIG. 8, the rear header member 7 is formed of a cross-sectional hat-shaped member having a front flange portion 22 and a rear flange portion 23 joined to the lower surface of the roof panel 8. The rear end portion 24 of the roof panel 8 is overlapped and fixed to the rear panel 25 to form a rear coupling portion 25.

  The rear flange portion 19 of the front header member 6 and the front flange portion 22 of the rear header member 7 and the roof panel 8 are fixed by being bonded with an adhesive 27 for an epoxy resin structure. Yes. Further, as shown in FIG. 4, the front coupling portion 21 and the rear coupling portion 25 are provided between the elastic adhesive portions 28 provided at the left and right end portions thereof and the elastic adhesive portions 28, 28, that is, the front coupling portion 21. And a spot welded portion 29 disposed at the center of the rear coupling portion 25 in the vehicle width direction.

  The front flange portion 18 of the front header member 6 and the rear flange portion 23 of the rear header member 7 and the front end portion 20 and the rear end portion 24 of the roof panel 8 have a Young's modulus at a temperature of 20 ° C. of 500 MPa or less. And an elastically deformable adhesive having a loss coefficient of 0.1 or more, for example, an epoxy resin quasi-structure adhesive 26 made of the above-mentioned product name “AD Sealer” manufactured by Sunstar Giken Co., Ltd. The elastic bonding portion 28 formed by this is provided only at the left and right end portions of the front connecting portion 21 and the rear connecting portion 25, and the front and rear end portions 20, 24 of the roof panel 8 and the front flange portion of the front header member 6 are provided. 18 and the rear flange member 23 of the rear header member 7 are spot-welded to each other at a predetermined interval. It is provided in the vehicle width direction central portion of the front coupling portion 21 and the rear coupling portion 25. Thereby, the application area | region of the said adhesive agent 26 is set so that the left and right both ends of the said front coupling part 21 and the rear coupling part 25 may be displaced relatively easily in a shear direction compared with the vehicle width direction center part.

  As described above, a pair of left and right front pillars 1 extending from the front portion of the waistline of the vehicle body toward the roof, a pair of left and right rear pillars 3 extending from the rear portion of the waistline of the vehicle body toward the roof, and the left and right side portions of the roof. A pair of left and right roof side rails 5 extending in the front-rear direction of the vehicle body, a front header member 6 extending in the vehicle width direction so as to connect the front ends of the left and right roof side rails 5, and the rear of both left and right roof side rails 5 A roof that covers a top surface of a rectangular area defined by a rear header member 7 extending in the vehicle width direction so as to connect ends and the left and right roof side rails 5, the front header member 6, and the rear header member 7 and whose outer peripheral portion is partitioned. And the right and left side portions 13 of the roof panel 8 are provided on the center side of the roof side rail 5 in the vehicle width direction. In a roof structure of an automobile having a roof side joint portion 14 that is overlapped and fixed to the flange portion 12, the roof side joint portion 14 is elastically deformed with a Young's modulus at a temperature of 20 ° C. of 500 MPa or less. An elastic adhesive portion 15 is provided in which the right and left side portions 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5 are bonded by a possible adhesive 17, and the front and rear end portions of the roof side joint portion 14 are Since the adhesive 26 is applied in such a manner that it can be relatively displaced in the shearing direction as compared with the central portion in the front-rear direction, the vibration generated between the roof panel 8 and the roof side rail 5, particularly a frequency of about 20 to 30 Hz. There is an advantage that low-frequency vibration can be effectively reduced with a simple configuration, and the riding comfort of the vehicle can be improved.

  That is, when the vehicle is traveling, traveling vibrations transmitted from the suspension are transmitted to the roof panel 8 via the front pillar 1 and the rear pillar 3 and the like, and if these vibrate at a constant cycle, the passengers feel uncomfortable and ride comfort. Inevitably gets worse. However, when an adhesive that can be elastically deformed, that is, an adhesive 17 having a Young's modulus at a temperature of 20 ° C. of 500 MPa or less is provided on the elastic adhesive portion 15 of the roof side joint portion 14 as described above, for example, As shown in FIG. 9, while absorbing the energy of the vibration displacement that elastically deforms the adhesive 17 in accordance with the load acting in the direction of vibration displacement of the roof side rail 5 toward the center side and the outer side of the vehicle body. By transmitting the load to the roof panel 8 with a predetermined phase delay, the low frequency vibration can be efficiently attenuated with a simple configuration, and the riding comfort of the vehicle can be effectively improved.

  When an adhesive having an excessively strong adhesive force is provided on the elastic adhesive portion 15, a large relative displacement is caused between the left and right side portions 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5. Therefore, it is necessary to use the adhesive 17 having a Young's modulus lower than 500 MPa at a temperature of 20 ° C. because a sufficient damping action cannot be obtained. In particular, in the first embodiment, since the adhesive 17 has a loss coefficient of 0.1 or more at a temperature of 20 ° C., the loss coefficient of the adhesive provided in the elastic adhesive portion 15 is too small. For this reason, it is possible to effectively prevent the occurrence of a situation in which it is impossible to sufficiently obtain the damping action of the vibration generated between the flange portion 12 of the roof side rail 5 and the low frequency vibration can be prevented with a simple configuration. There is an advantage that it can be attenuated more efficiently.

  The lower the Young's modulus of the adhesive 17, the more effectively the low frequency vibration can be reduced. However, when an adhesive having an excessively low Young's modulus is used, There is a problem that the shape of the elastic bonding portion 15 cannot be maintained due to the insufficient adhesive force. For this reason, it is desirable to use the adhesive 17 having a Young's modulus of 50 MPa or more at a temperature of 20 ° C., for example.

  And in the said 1st Embodiment, while arrange | positioning the elastic adhesive part 15 with which the said adhesive agent 17 was apply | coated only to the front-and-rear both-ends part of the roof side coupling | bond part 14, the said front side direction center part of the roof side coupling | bond part 14 is described above. Since the spot welded portion 16 is formed by spot welding the left and right side portions 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5 at a predetermined interval, the roof panel 8 has the spot welded portion 16. There is an advantage that traveling vibration transmitted to the roof panel 8 through the front pillar 1 and the rear pillar 3 and the like can be effectively attenuated while sufficiently maintaining the bonding strength between the roof side rail 5 and the roof side rail 5.

  That is, as shown in FIGS. 11 and 12, when a torsional vibration force M acts to alternately displace the vehicle body with a center line extending in the front-rear direction through the center of gravity of the vehicle as a fulcrum, this torsional vibration is applied. While the force M acts in a direction to displace the corner portion of the roof panel 8 supported by the front pillar 1 and the rear pillar 3 in a direction in which the corner portion is alternately moved toward the center side and the outer side of the vehicle body, A displacement load corresponding to the torsional vibration force M hardly acts on the central portion of the roof panel 8 in the front-rear direction. Therefore, an adhesive agent is used in the elastic adhesive portion 15 while maintaining a sufficient bonding strength between the roof panel 8 and the roof side rail 5 in the spot welded portion 16 disposed in the center portion in the front-rear direction of the roof side connecting portion 14. The torsional vibration force M can be effectively reduced by elastically modifying 17.

  In addition, it replaces with the said embodiment which arrange | positioned the elastic adhesion part 15 to which the said adhesive agent 17 was apply | coated only to the front-and-rear both-ends part of the said roof side coupling | bond part 14, or the above-mentioned only to the both front-and-rear both end parts of the said roof side coupling | bond part In addition to the above-described configuration in which the elastic bonding portion 15 to which the adhesive 17 is applied is disposed, as shown in FIG. 13, the elastic bonding portion 15 provided on the roof side coupling portion 14 has both left and right sides of the roof panel 8. The gap between the side portion 13 and the flange portion 12 of the roof side rail 5 is formed in a flared shape so as to increase toward the front and rear end portions of the roof side joint portion 14, and the roof side joint portion 14 Applying the adhesive 17 in such a manner that the coating thickness of the adhesive 17 at both front and rear end portions is larger than that of the central portion in the front-rear direction of the roof side coupling portion 14. More, the front and rear end portions of the roof side coupling portion 14 may be configured to be easily displaced relative to the shear direction as compared to the front-rear direction central portion thereof.

  That is, the relative displacement in the shearing direction of the roof panel 8 and the roof side rail 5 bonded by the adhesive 17 having the characteristics that the Young's modulus at a temperature of 20 ° C. is 500 MPa or less and the loss coefficient is 0.1 or more, When an experiment for examining the relationship with the coating thickness of the agent 17 was performed, data as shown in FIG. 14 was obtained. From this data, since the relative displacement amount tends to increase as the coating thickness of the adhesive 17 increases, the coating thickness of the adhesive 17 at the front and rear end portions of the roof side coupling portion 14 is determined as the roof side coupling portion. By changing the coating amount of the adhesive 17 so as to be larger than the center portion in the front-rear direction 14, the front and rear end portions of the roof side joint portion 14 are relatively displaced in the shearing direction compared to the center portion in the front-rear direction. It can be seen that the structure can be made easier.

  By applying the adhesive 17 in such a manner that the application thickness of the adhesive 17 at both front and rear end portions of the roof side joint portion 14 is larger than that of the center portion in the front and rear direction of the roof side joint portion 14 as described above. When the front and rear end portions of the roof side joint portion 14 are configured to be relatively displaced in the shear direction as compared with the center portion in the front and rear direction, the front and rear end portions of the roof side joint portion 14 are changed according to the torsional vibration force M. It can be displaced greatly. Therefore, the vibration suppressing effect by elastically modifying the adhesive 17 applied to the front and rear end portions of the roof side joint portion 14 is remarkably obtained, and the torsional vibration force M is more effectively reduced. There is an advantage that you can.

  Further, as shown in FIG. 15, in the elastic adhesive portion 15 provided in the roof side joint portion 14, the adhesive application area at the front and rear end portions of the roof side joint portion 14 is set to be the front and rear of the roof side joint portion 14. By applying the adhesive in such a manner that it is narrower than the central portion in the direction, the front and rear end portions of the roof side coupling portion 14 are relatively easily displaced in the shear direction as compared to the central portion in the front and rear direction. May be. When configured in this way, there is an advantage that the torsional vibration force M can be reduced more effectively.

  That is, the relative displacement in the shearing direction of the flange portion 12 of the roof panel 8 and the roof side rail 5 bonded by the adhesive 17 having the characteristics that the Young's modulus at a temperature of 20 ° C. is 500 MPa or less and the loss coefficient is 0.1 or more. When an experiment for examining the relationship between the amount and the application area of the adhesive 17 was performed, data as shown in FIG. 16 was obtained. From this data, since the relative displacement amount tends to decrease as the application area of the adhesive 17 increases, the application width (application area) of the adhesive 17 at both front and rear end portions of the roof side coupling portion 14 is determined as the roof side. By changing the application area of the adhesive 17 so as to be smaller than the front-rear direction center portion side of the joint portion 14, the front and rear end portions of the roof side joint portion 14 are sheared in comparison with the front-rear direction center portion. It can be seen that the structure can be easily displaced relatively.

  Therefore, by applying the adhesive 17 in such a manner that the application width of the adhesive 17 at the front and rear end portions of the roof side joint portion 14 is smaller than that of the center portion in the front and rear direction of the roof side joint portion 14 as described above. When the front and rear end portions of the roof side joint portion 14 are configured to be relatively displaced in the shearing direction as compared with the center portion in the front and rear direction, the adhesive 17 applied to the front and rear end portions of the roof side joint portion 14. As a result, the torsional vibration force M can be reduced more effectively.

  In the first embodiment, the front joint portions 20 and 24 of the roof panel 8 are overlapped and fixed to the flange portions 18 and 23 provided on the front header member 6 and the rear header member 7, respectively. In the roof structure of an automobile having 21 and a rear coupling portion 25, the front coupling portion 21 and the rear coupling portion 25 have elasticity having characteristics that the Young's modulus at a temperature of 20 ° C. is 500 MPa or less and the loss coefficient is 0.1 or more. The elastic adhesive portions 21 and 25 in which the front and rear end portions 20 and 24 of the roof panel 8 are bonded to the flange portions 18 and 23 of the front header member 6 and the rear header member 7 by the deformable adhesive 26 are provided. The front header member 6 and the rear header member 7 are vibrated and displaced toward the center side and the outer side of the vehicle body. When a direction load is applied, for example, as shown in FIG. 10, the adhesive 26 provided on the front coupling portion 21 is elastically deformed to absorb the energy of the vibration displacement, and a predetermined phase delay is caused. By transmitting the load from the front header member 6 to the roof panel 8, there is an advantage that an excellent damping action can be obtained with a simple configuration.

  Further, as shown in the first embodiment, an elastic adhesive portion 28 coated with the adhesive 26 is disposed only on the left and right end portions of the front coupling portion 21 and the rear coupling portion 25, and the front coupling portion 21 and A structure in which a spot welded portion 29 formed by spot welding the left and right side portions 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5 at a predetermined interval is provided at a center portion in the vehicle width direction of the rear coupling portion 25; In this case, the adhesive 26 is elastically denatured at the elastic bonding portion 28 while sufficiently maintaining the bonding strength between the roof panel 8 and the front header member 6 and the rear header member 7 at the spot welded portion 29. There is an advantage that the torsional vibration force M can be more effectively reduced.

  Further, in order to effectively attenuate the vibration transmitted to the roof panel 8 through the front pillar 1 and the rear pillar 3 etc., it is provided at both left and right end portions of the front coupling portion 21 and the rear coupling portion 25. In the elastic adhesive portion 28, the application thickness of the adhesive 26 is such that the left and right end portions are larger than the central portion in the vehicle width direction, the Young's modulus at a temperature of 20 ° C. is 500 MPa or less, and the loss coefficient is 0. . By applying the adhesive 26 having one or more characteristics, the left and right end portions of the front coupling portion 21 and the rear coupling portion 25 can be relatively displaced in the shearing direction as compared with the center portion in the vehicle width direction. It is preferable to configure.

  Further, in the elastic adhesive portions 28 provided at the left and right end portions of the front connecting portion 21 and the rear connecting portion 25, the adhesive application area at the left and right end portions of the front connecting portion 21 and the rear connecting portion 25 is determined by the vehicle width. By applying the adhesive 26 in a manner narrower than the central portion in the direction, the left and right end portions of the front joint portion 21 and the rear joint portion 25 are relatively displaced in the shear direction as compared to the central portion in the vehicle width direction. The structure may be configured so that the vibration transmitted from the front pillar 1 and the rear pillar 3 to the roof panel 8 can be effectively damped.

  FIG. 17 shows a second embodiment of an automobile roof structure according to the present invention. In the automobile roof structure according to the second embodiment, the roof side coupling portion 14 is formed by the left and right side portions 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5 and extends in the vehicle width direction. 30 and a vertical wall portion 31 that is connected to the horizontal portion 30 and extends in the vertical direction, and has a substantially L-shaped cross section. The Young's modulus at a temperature of 20 ° C. is 500 MPa or less on the vertical wall portion 31. An elastic adhesive portion coated with an adhesive 17 having a characteristic with a loss factor of 0.1 or more is provided, and the side portion 13 of the roof panel 8 and the flange portion 12 of the roof side rail 5 are provided on the horizontal portion 30. Spot welded spot welds are provided.

  According to the above configuration, the vertical vibration transmitted to the roof panel 8 from the front pillar 1 and the rear pillar 3 through the roof side coupling portion 14 is elastically deformed to the adhesive 17 applied to the vertical wall portion 31. Therefore, the bonding strength between the roof panel 8 and the roof side rail 5 can be sufficiently maintained at the spot welded portion of the horizontal portion 30. In addition, since the adhesive 17 can be applied at a position independent of the spot welded portion, the application operation can be performed easily and appropriately, and the application thickness of the adhesive 17 can be accurately managed. There are advantages.

It is explanatory drawing which shows schematic structure of the vehicle body provided with the roof structure of the motor vehicle based on 1st Embodiment of this invention. It is a top view of the said vehicle body. It is the III-III sectional view taken on the line of FIG. It is a perspective view which shows the structure of a roof panel. It is a characteristic view which shows the characteristic of an adhesive agent. It is a kinematic viscosity characteristic figure of an adhesive agent. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is explanatory drawing which shows the elastic deformation state of the adhesive agent in a roof side coupling | bond part. It is explanatory drawing which shows the elastic deformation state of the adhesive agent in a front coupling part. It is explanatory drawing which shows the deformation | transformation state of a roof. It is explanatory drawing which shows the deformation | transformation state of a roof. It is side surface sectional drawing which shows the modification of a roof side coupling | bond part. It is a graph which shows the relationship between the application | coating thickness of an adhesive agent, and the relative displacement of a coupling | bond part. It is a top view which shows the modification of a roof side coupling | bond part. It is a graph which shows the relationship between the application area of an adhesive agent, and the relative displacement of a coupling | bond part. FIG. 4 is a view corresponding to FIG. 3 showing a second embodiment of the automobile roof structure according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front pillar 3 Rear pillar 5 Roof side rail 6 Front header 7 Rear header 8 Roof panel 12 Roof side rail flange part 13 Roof panel side part 15 Elastic adhesive part 17 Adhesive

Claims (3)

A pair of left and right front pillars extending from the front waistline toward the roof, a pair of left and right rear pillars extending from the rear waistline toward the roof, and left and right extending along the left and right sides of the roof. A pair of roof side rails, a front header member extending in the vehicle width direction so as to connect the front ends of the left and right roof side rails, and a rear header portion of the left and right roof side rails in the vehicle width direction A rear header member that extends, and a roof panel that covers the upper surface of the rectangular area defined by the left and right roof side rails, the front header and the rear header, and the left and right sides of the roof panel are Roof side connection, which is superimposed and secured to the flange provided at the center in the vehicle width direction Part A roof structure for an automobile having,
Elasticity in which the left and right sides of the roof panel and the flanges of the roof side rail are joined to the roof side joint by an elastically deformable adhesive having a Young's modulus of 500 MPa or less at a temperature of 20 ° C. An adhesive part is provided, and the adhesive is applied in such a manner that the front and rear end parts of the roof side joint part are more easily displaced in the shearing direction than the center part in the front-rear direction ,
The elastic adhesive portion is disposed only at the front and rear end portions of the roof side joint portion, and at the center portion in the front-rear direction of the roof side joint portion, the left and right side portions of the roof panel and the flange portion of the roof side rail are provided. A structure of a roof part of an automobile, characterized in that spot welds are provided by spot welding at predetermined intervals . 2. The adhesive according to claim 1, wherein the adhesive is applied in such a manner that the thickness of the adhesive at both front and rear end portions of the roof side joint portion is larger than that of the center portion in the front and rear direction of the roof side joint portion. The automobile roof structure described. Area of the adhesive in the front and rear end portions of the roof side coupling part, claim the adhesive becomes narrower manner than in the front-rear direction central portion of the roof side coupling unit is characterized in that it is applied 1 or 2 The roof part structure of a motor vehicle described in 1.

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