JP2011093449A - Structure for adhering back door opening upper side corner part and method for assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively damp low frequency vibration during traveling without increasing weight. <P>SOLUTION: A rear pillar side block is formed into a closed section shape by a rear pillar inner member, a side outer panel member 30 and a side gutter member 32 constituting a gutter in a side edge part of a back door opening. A rear header member 12 extending in a vehicle width direction to constitute a closed section is joined to a lower surface in a rear edge part of a roof panel. A hinge reinforcement 15 constituting a vehicle width direction end part of the rear header member 12 is joined to gusset member 33 joined to the rear pillar side block. The hinge reinforcement 15 and the gusset member 33 are joined by adhesion to be performed by using an adhesion material having a Young's modulus of ≤500 Mpa at a temperature of 20°C and a loss factor of ≥0.1, in an adhesion area S. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bonding structure of an upper corner portion of a back door opening and an assembling method thereof.

  Some automobiles have a back door opening that is opened and closed by a back door at the rear of the vehicle body, as seen in hatchback cars, wagon cars, one box cars, and the like. The back door opening is constituted by a rear header extending in the vehicle width direction with its upper edge formed at the rear edge of the roof panel, and its left and right side edges are constituted by a pair of left and right rear pillars. The end in the vehicle width direction is joined to the upper end of the rear pillar.

  By the way, during traveling, low-frequency vibrations (particularly, low-frequency vibrations of 50 Hz or less) that are unpleasant vibrations easily occur due to deformation of the vehicle body. Patent Document 1 discloses that the dynamic rigidity of a vehicle body is improved by using a rod-shaped hydraulic attenuator.

JP 2007-203896 A

  In a vehicle having a back door opening as described above, it is easy for deformation to occur near the corner portion above the back door opening (near the coupling portion between the rear header and the rear pillar portion) during traveling. It tends to be a source of unpleasant low frequency vibration. In order to prevent or suppress such low-frequency vibration, it is conceivable to improve the rigidity of the corner portion or use a hydraulic attenuator as described in Patent Document 1. However, simply improving the rigidity of the vehicle body increases the weight of the vehicle body and increases the cost. In addition, when a hydraulic attenuator as described in Patent Document 1 is used, the cost is extremely high and the weight of the vehicle body also increases.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce low-frequency vibration at the corner formed on the upper side of the back door opening without increasing the weight of the vehicle body and at low cost. An object of the present invention is to provide a back door opening upper corner bonding structure and an assembling method thereof.

In order to achieve the above object, the following first solution is adopted for the adhesive structure in the present invention. That is, as described in claim 1 in the claims,
The rear pillar side block constituting the side edge portion of the back door opening is formed in a closed cross-sectional shape by the rear pillar inner member, the side outer panel member, and the side rain gutter member constituting the gutter at the side edge portion of the back door opening,
A rear header member that extends in the vehicle width direction and forms a closed cross section is joined to the lower surface of the rear edge of the roof panel, and the vehicle width direction end of the rear header member is joined to the rear pillar side block,
The joining of the rear header member and the rear pillar side block is performed by adhesion using an adhesive having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more.
It is like that. According to the above solution, even if the joint portion between the rear header member and the rear pillar side block is relatively displaced during running and low frequency vibration is generated, the low frequency vibration is caused by the vibration damping action by the adhesive that becomes the elastic member. Attenuating promptly, the unpleasant low frequency vibration can be greatly reduced.

Preferred embodiments based on the above solution are as described in claims 2 to 4 in the claims. That is,
A gusset member having a projecting portion projecting inward in the vehicle width direction is joined to the pillar inner member and the side gutter member,
The rear header member is bonded to the upper surface of the protruding portion of the gusset member by the adhesive.
(Corresponding to claim 2). In this case, it is possible to sufficiently secure the bonding surface of the rear pillar side block to the rear header member, that is, the bonding area by the adhesive, while reinforcing the vicinity of the rear pillar upper end portion by the gusset member.

At the rear end of the roof panel, an upper rain gutter portion is formed that extends in the vehicle width direction and forms a gutter portion at the upper edge of the back door opening,
An end in the vehicle width direction of the upper side gutter part is bonded to the part of the upper surface of the upper end part of the side gutter member by the adhesive.
(Corresponding to claim 3). In this case, the low frequency vibration can be further reduced by utilizing the adhesion of the roof panel with the adhesive.

The side outer panel member is formed with a mohawk portion that extends downward from the upper end of the side outer panel member toward the inner side in the vehicle width direction.
A flange portion formed on the upper end portion of the rear pillar inner member is joined to the lower surface of the mohawk portion,
An end of the roof panel in the vehicle width direction is bonded to the upper surface of the Mohawk portion by the adhesive.
(Corresponding to claim 4). In this case, while obtaining the same effect as the effect corresponding to claim 3, it is preferable to secure a large adjustment allowance for the bonding area by using a long mohawk portion in the front-rear direction.

In order to achieve the above object, the following solution is adopted in the assembling method of the present invention. That is, as described in claim 5, the rear pillar side block constituting the side edge portion of the back door opening constitutes a rain pillar at the side edge portion of the rear pillar inner member, the side outer panel member, and the back door opening. The rear door member is formed in a closed cross-sectional shape by a side gutter member, and a rear header member that extends in the vehicle width direction and forms a closed cross-section is joined to the lower surface of the rear edge of the roof panel. A method for assembling the corner part,
The joining of the rear header member in the vehicle width direction end and the rear pillar side block is performed by applying an adhesive in advance to the overlapping portion, and then spot welding,
As the adhesive, a material having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more is used.
It is like that. According to the above solution, an assembling method for obtaining an adhesive structure corresponding to claim 1 is provided. In addition, since spot welding is also performed separately in addition to the bonding with the adhesive, it is preferable in balancing both the bonding strength and the reduction of the low frequency vibration at a high level.

  According to the present invention, it is possible to reduce low-frequency vibration generated at the upper corner portion of the back door opening during traveling without increasing the weight of the vehicle body and at low cost.

The rear perspective view which shows an example of the body structure of the motor vehicle to which this invention was applied. The perspective view which looked at the left rear pillar side block from the upper left back in the state which removed the roof panel side block. The perspective view which looked at the left rear pillar side block from the upper right back in the state which removed the roof panel side block. FIG. 3 is a cross-sectional view corresponding to line X4-X4 of FIG. X5-X5 line equivalent sectional drawing of FIG. The perspective view which decomposes | disassembles a roof panel side block into a roof panel and a rear header member. X7-X7 line equivalent sectional drawing of FIG. The figure which looked at the junction part of a rear pillar side block and a roof panel side block from the upper part. The figure which shows the state which removed the roof panel from the state of FIG. 8, and shows an adhesion | attachment area | region. The figure which shows the state which removed the rear header upper member from the state of FIG. The figure which shows the state which removed the hinge reinforcement which comprises some rear header lower members from the state of FIG. The figure which shows the state which removed the rear header lower member from the state of FIG. Sectional drawing which shows an example of the adhesion | attachment method by an adhesive material. Sectional drawing which shows another example of the adhesion | attachment method by an adhesive material.

  In FIG. 1, the body B of the automobile has a pair of front and rear side openings 1 and 2 on its left and right sides. The front side opening 1 is opened and closed by a front side door (not shown), and the rear side opening 2 is opened and closed by a rear side door (not shown). Further, the body V has a back door opening 3 serving as a rear opening, and the back door opening 3 is opened and closed by a back door (not shown). The back door is opened and closed with a hinge 4 provided at the upper edge of the back door opening 3 as a center, and a damper for connecting the body B and the back door is denoted by reference numeral 5.

  In FIG. 1, reference numeral 10 denotes a roof panel, and a side edge portion thereof is a roof side rail 11 extending in the front-rear direction. Reference numeral 20 denotes a rear pillar, and reference numeral 30 denotes a side outer panel member for constituting the rear pillar 20.

  The configuration of the rear pillar 20 will be described with reference to FIGS. First, the rear pillar 20 is configured in a closed cross section by a side outer panel member 30, a rear pillar inner member 31, and a side gutter member 32. The side gutter member 32 constitutes a gutter extending in the vertical direction at the side edge of the back door opening 3. The side gutter member 32 extends so that its upper end portion slightly protrudes inward in the vehicle width direction, and this protruding portion is an upper side that is configured at the rear edge portion of the roof panel 10 to be described later. It is made to continue to the gutter part 10a. The side gutter member 32 and the upper gutter member 10a are positioned so as to be slightly recessed from the outer surface of the vehicle body in the vicinity thereof, and when the back door is closed, the outer surface of the back door becomes the side outer panel 30 or The roof panel 10 is substantially flush with the roof panel 10.

  As shown in FIG. 5, the side outer panel member 30 has a mohawk portion 30 a that once extends downward from the upper end of the outer surface and then extends short inward in the vehicle width direction. Further, the rear pillar inner member 31 has a flange portion 31a extending toward the inner side in the vehicle width direction at the upper end portion, and the flange portion 31a is joined to the lower surface of the mohawk portion 30a. And the side edge part of the roof panel 10 is joined to the upper surface of the mohawk part 30a. That is, the side edge portion of the roof panel 10 has a flange portion 10b that once extends downward and then extends to the outer side in the vehicle width direction. The flange portion 10b is joined to the upper surface of the Mohawk portion 30a. Yes. As a result, a side gutter portion 16 is formed on the side edge portion of the roof panel 10 corresponding to the mohawk portion 30a.

  The side outer panel member 30, the rear pillar inner member 31, and the side gutter member 32 constitute a rear pillar side block B1. A gusset member 33 is joined to the rear pillar side block B1. The gusset member 33 has a protruding portion 33a that extends toward the inner side in the vehicle width direction, while the vehicle width direction outer side portion is joined to the rear pillar inner member 31 (the lower surface and the vehicle width direction inner side surface). The projecting portion 33a is positioned so as to overlap the roof panel 10 and is used for joining with the roof panel 10 as will be described later. In addition, the gusset member 33 has three directions from the upper end of the rear pillar 20 to the front (the roof side rail 11 side), the lower side (the side gutter member 32 side), and the inner side in the vehicle width direction (corresponding to the protruding portion 33a). The three-direction crossing portion, that is, the back door opening upper corner portion is reinforced.

  As shown in FIGS. 5 and 6, the roof panel 10 has a rear header member 12 that extends in the vehicle width direction and forms a closed cross section joined to the lower surface of the rear edge. In the embodiment, the rear header member 12 includes a rear header upper member 13, a rear header lower member 14, and a hinge reinforcement 15 joined to an end of the rear header lower member 14 in the vehicle width direction. . The hinge reinforcement 15 substantially constitutes a part of the rear header lower member 14, and can be integrally formed with each other without being divided.

  As shown in FIG. 7, the rear header upper member 13 has a front edge and a rear edge joined to the lower surface of the roof panel 10, and a rear header lower member 14 has a front edge and a rear edge. Are joined to the lower surface of the rear header upper member 12. The above-described upper rain gutter portion 10a is formed by extending the rear end portion of the roof panel 10 downward once, extending backward, and further extending upward short. And the rear edge part of the rear header member 12 (13, 14) is joined to the lower surface of the upper side gutter part 10a. The roof panel 10 and the rear header member 12 (13, 14, 15) constitute the roof panel side block B2.

  The upper and lower overlapping states of the roof panel 10, the rear header upper member 13, the rear header lower member 14, and the hinge reinforcement 15 will become apparent with reference to FIGS. 5 and 8 to 12. FIG. As shown in FIGS. 8 to 12, the joining state (overlapping relationship) between the rear pillar side block B1 and the roof panel side block B2 is as follows. First, as shown particularly in FIG. 10, the end portion in the vehicle width direction of the hinge reinforcement 15 overlaps with substantially the entire upper surface of the protruding portion 33 a of the gusset member 33 and is joined at the overlapping portion. Moreover, as shown in FIG. 11, the vehicle width direction end part of the rear header lower member 14 overlaps with a part of the protrusion part 33a of the gusset member 33, and is joined by this overlapping part. The rear header upper member 13 is not directly joined to the rear pillar side block B <b> 1 including the gusset member 33. Further, the roof panel 10 has a portion of the rear edge portion (upper side gutter portion 10a) of the vehicle width direction end portion that overlaps a part of the upper surface of the protruding portion 33a of the gusset member 33, and this overlapping portion. It is joined with.

  Here, when the rear pillar side block B1 and the roof panel side block B2 are joined, adhesion using an adhesive is used. In the embodiment, a portion surrounded by a broken line in FIG. This adhesion region S occupies most of the overlapping area of the gusset member 33 (projecting portion 33a thereof) and the hinge reinforcement 15, and the joining of the gusset member 33 and the hinge reinforcement 15 is the adhesion by the adhesive. Has been. Further, a part of the adhesion region S is set so as to overlap a part of the rear edge of the roof panel 10 (a part of the end in the vehicle width direction of the upper gutter part 10a). Adhesion with an adhesive is also performed at the part. Adhesion with an adhesive is also performed at a portion (see FIG. 5) where the rear end portion of the side edge portion of the roof panel 10 overlaps the mohawk portion 30a.

  As the adhesive used for bonding in the bonding region S described above, a material having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more is used. By using such an adhesive material, the damping action of the adhesive material existing in the adhesive region S is effectively exhibited, and the rear pillar side block B1 and the roof panel side block B2 are displaced by the torsion of the vehicle body during traveling. Even if low frequency vibration is generated, this low frequency vibration (especially 20 to 30 Hz vibration) is quickly attenuated (the passenger does not feel or feel uncomfortable low frequency vibration). . Incidentally, if the occurrence of low-frequency vibrations is reduced by improving the coupling rigidity between the rear pillar side block B1 and the roof panel side block B2 using, for example, reinforcement, a significant increase is caused by the reinforcement. Reinforcement is required, which increases the cost and significantly increases the weight of the vehicle body.

  FIG. 13 shows an example of an adhesion method using an adhesive. In the example shown in FIG. 13, an example of adhesion between the gusset member 33 (the convex portion 33 a thereof) and the hinge reinforcement 15 that substantially constitutes the vehicle width direction end portion of the rear header lower member 14 is shown. That is, in the bonding region S, a slight gap 40 of 1 mm or less is formed between the gusset member 33 and the hinge reinforcement 15, and the gap 41 is filled with the adhesive 41. And in parts other than the gap 40, the gusset member 33 and the hinge reinforcement 15 are brought into close contact with each other and spot welded (the spot welded part is indicated by reference numeral 42). Further, spot welding 42A is also performed on a part of the adhesion region S. In order to obtain an adhesion example as shown in FIG. 13, the gusset member 33 and the hinge reinforcement 15 are press-molded so that the gap 40 is formed and the spot welded portion 42A is in contact with each other. What is necessary is just to make a recessed part beforehand in the site | part corresponded to the spot welding 42A. Note that the spot weldings 42 and 42A are performed in a state where the adhesive 41 is present in the bonding region S in advance. Further, the spot welding 42A in the adhesion region S may not be performed.

  FIG. 14 shows another example of adhesion. In this example, the clearance 40 is secured by using bolts 45, nuts 46, and spacers 47. That is, an annular spacer 47 made of a washer or the like is interposed between the gusset member 33 and the hinge reinforcement 15 so that the gap 40 is not crushed. In correspondence with the spacers 47, nuts 46 are fixed to the lower surface of the gusset member 33 by welding or the like, a through hole 48 is formed in the hinge reinforcement 15, and a through hole 49 is formed in the gusset member 33. Then, from above the hinge reinforcement 15, the bolt 45 is threaded into the nut 46 through the through hole 48, the spacer 47, and the through hole 49. The spacer 47 prevents the gap 40 from becoming unnecessarily small, and the bolt 45 and the nut 46 prevent the gap 40 from becoming unnecessarily large. The through holes 48 and 49 are larger in diameter than the bolt 45 (the diameter of the threaded portion thereof), and the gusset member 33 and the hinge reinforcement 15 are slightly relative to each other in the plate surface direction in the portion where the gap 40 exists. Displaceable. The nut 46 may be fixed to the hinge reinforcement 15 side.

  In order to obtain the structure shown in FIG. 14, first, the spacer 47 is interposed between the gusset member 33 and the hinge reinforcement 15 and the adhesive 41 is applied, and then the bolt 45 is screwed onto the nut 46. Finally, spot welding 42 may be performed at an appropriate position around the gap 40 (adhesive 41) (execution of spot welding after application of the adhesive 41). The spot welding 42 can be performed at a portion where the gap 40 exists, or the spot welding 42 can be omitted.

  Here, as an adhesive having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more, for example, a sealer or a rubber-based adhesive often used in a hemming portion between an outer panel and an inner panel There is material. Incidentally, the structural adhesive that adheres rigidly has a Young's modulus at a temperature of 20 ° C. of 500 Mpa or more and a loss factor significantly smaller than 0.1.

  By adjusting the thickness and area of the adhesive in the bonding region S, the static torsional rigidity and vibration damping ratio (vibration damping ratio in the case of a normal joint structure using only spot welding without using an adhesive, The larger the value is, the higher the damping effect of the low-frequency vibration becomes). Here, as the thickness of the adhesive is increased, the vibration attenuation ratio can be increased. However, there is a limit to the increase of the vibration attenuation ratio, and the usage amount of the adhesive 41 is increased. Moreover, the vibration attenuation ratio can be increased as the bonding area is increased. However, from the viewpoint of increasing the relative displacement of the bonding portion and the reduction in the amount of the adhesive 41 used, it is possible to reduce the bonding area as much as possible. preferable. Incidentally, when the thickness of the adhesive 41 is set to about 0.1 to 1 mm in the area range shown in the adhesion region S, the vibration damping ratio is increased by 70 to 130% while suppressing the decrease in static torsional rigidity. (The vibration damping ratio in the conventional joining only by spot welding is 0%). Further, by adhering the roof panel 10 (a part thereof) to the rear pillar side block B1 with the adhesive 41, it is preferable in securing a large allowance for adjusting the adhesion area, that is, a tuning allowance for vibration characteristics. A large adjustment allowance for the adhesion area can be secured in the mohawk portion 30a extending in the front-rear direction.

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . The rear header member 12 is not limited to being constituted by the two members of the upper member 13 and the lower member 14, but may have only one of them (however, it overlaps with the gusset member 33, that is, the rear pillar side block B1). Set to a long length). The roof panel 10 (particularly the side edge) may not be bonded to the rear pillar side block B1 by the adhesive 41. The rear header member 12 can be directly joined to the rear pillar side block B1 without using the gusset member 33. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is preferable as a technique for reducing vibration (noise) of automobiles.

B: Body B1: Rear pillar side block B2: Roof panel side block S: Adhesion area 3: Back door opening 10: Roof panel 10a: Upper rain gutter 11: Roof side rail 12: Rear header member 13: Rear Header upper member 14: Rear header lower member 15: Hinge reinforcement 16: Side rain gutter 20: Rear pillar 30: Side outer panel member 30a: Mohawk portion 31: Rear pillar inner member 32: Side gutter member 33: Gusset member 33a: convex part 40: gap 41: adhesive 42, 42A: spot welding 45: bolt 46: nut 47: spacer

Claims (5)

The rear pillar side block constituting the side edge portion of the back door opening is formed in a closed cross-sectional shape by the rear pillar inner member, the side outer panel member, and the side rain gutter member constituting the gutter at the side edge portion of the back door opening,
A rear header member that extends in the vehicle width direction and forms a closed cross section is joined to the lower surface of the rear edge of the roof panel, and the vehicle width direction end of the rear header member is joined to the rear pillar side block,
The joining of the rear header member and the rear pillar side block is performed by adhesion using an adhesive having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more.
Adhesive structure of the upper corner portion of the back door opening. In claim 1,
A gusset member having a projecting portion projecting inward in the vehicle width direction is joined to the pillar inner member and the side gutter member,
The rear header member is bonded to the upper surface of the protruding portion of the gusset member by the adhesive.
Adhesive structure of the upper corner portion of the back door opening. In claim 1 or claim 2,
At the rear end of the roof panel, an upper rain gutter portion is formed that extends in the vehicle width direction and forms a gutter portion at the upper edge of the back door opening,
An end in the vehicle width direction of the upper side gutter part is bonded to the part of the upper surface of the upper end part of the side gutter member by the adhesive.
Adhesive structure of the upper corner portion of the back door opening. In any one of Claims 1 thru | or 3,
The side outer panel member is formed with a mohawk portion that extends downward from the upper end of the side outer panel member toward the inner side in the vehicle width direction.
A flange portion formed on the upper end portion of the rear pillar inner member is joined to the lower surface of the mohawk portion,
An end of the roof panel in the vehicle width direction is bonded to the upper surface of the Mohawk portion by the adhesive.
Adhesive structure of the upper corner portion of the back door opening. The rear pillar side block constituting the side edge portion of the back door opening is formed in a closed cross-sectional shape by the rear pillar inner member, the side outer panel member, and the side rain gutter member constituting the rain gutter at the side edge portion of the back door opening. On the other hand, it is an assembly method of a back door opening upper corner part, in which a rear header member that extends in the vehicle width direction and forms a closed section is joined to the lower surface of the rear edge of the roof panel,
The joining of the rear header member in the vehicle width direction end and the rear pillar side block is performed by applying an adhesive in advance to the overlapping portion, and then spot welding,
As the adhesive, a material having a Young's modulus at a temperature of 20 ° C. of 500 Mpa or less and a loss coefficient of 0.1 or more is used.
A method for assembling the upper corner portion of the back door opening.

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